• 专利附录
  • 专利说明
  • 权利要求
  • 类似技术
  • 同族专利
  • 引用文献
  • 法律状态
  • 优先权
    • 专利摘要:
    The present invention relates to a composition comprising an inorganic binder for molding, comprising: a water-soluble glass at 40 to 70 parts by weight; nano-silica at 5 to 35 parts by weight; a water-resistant Li-based additive at 0.1 to 10 parts by weight; an organic silicon compound in an amount of 0.1 to 10 parts by weight; and an anti-calcination additive of sand at 1 to 10 parts by weight. In addition, the invention relates to a core made using the composition comprising an inorganic binder and a molding fabricated to include the core.
    公开号:FR3029908A1
    申请号:FR1561652
    申请日:2015-12-01
    公开日:2016-06-17
    发明作者:Man Sig Lee；Min A Bae；Myung Hwan Kim；Sang Ho Ha
    申请人:DR AXION CO Ltd；
    IPC主号:
    专利说明:

    [0001] The present disclosure relates to a composition comprising an inorganic binder for molding and, more particularly, to a composition comprising an inorganic binder for molding which is environmentally friendly, including mechanical strength and resistance to abrasion. increased in order to be adapted to a climate where the temperature and humidity are high, and which is improved in terms of sand calcination by the inclusion of nano-silica, a water-resistant additive based on Li , an organic silicon compound and an anti-calcination additive for sand in a waterglass. The Korean foundry industry has made a significant contribution to all types of industries, including the shipbuilding industry, the auto parts industry, the industrial machinery industry, the construction machinery industry, among others. Although the foundry industry is an important and indispensable basic industry for the development of the domestic industry, the current climate around the foundry industry, such as environmental problems, fluctuating prices of auxiliary materials, policies, lack of manpower, among others, is not very good. Above all, environmental problems have been set as a priority to be resolved. Currently, in the molding industry, environmental pollution has been improved to block the release of environmental pollutants generated during metal dissolution processes, core manufacturing processes and molding processes. However, since the smelter sector has been regulated with respect to greenhouse gas emissions under the Muskie Act, the Kyoto Protocol, among other things, it has been urgent to find a method to get rid of releases of greenhouse gases. basic pollutants and a technical method for reducing energy consumption, improving the working environment and greening manufacturing sites. In other words, an organic binder has been widely used for years for mass production of small product and multi-shaped core moldings, but the organic binder generates toxic vapor during core molding and also produces VOCs, such as and benzene and carbon dioxide, when disassembling the moldings and, therefore, has a bad influence on the environment. In addition, the organic binder requires a large amount of thermal energy for sintering, and it is difficult to recover the sand due to ash or carbon residues within a molded object. Therefore, an environmentally friendly inorganic binder has been developed for the purpose of solving the environmental problem and improving the productivity of the cores. An inorganic binder allows for a low temperature curing process and does not generate toxic substances and therefore good conditions are maintained in the work environment. In addition, only a small amount of gas is generated during the core manufacturing process and molding process and, therefore, molding defects are reduced, and there is no need to install a system. environmental pollution control, so manufacturing costs can be reduced. In this regard, Korean Laid-open Patent Publication No. 10-2011-0 106 372 discloses a technique of using an inorganic binder to make a sand mold and a core by mixing sand with sand. sodium hydroxide and tetraethylsilicate. In addition, Korean Patent No. 10-1,027,030 discloses a technique of using a slurry containing sodium hydroxide solution, an alkali silicate having a solids content of 70% and amorphous spherical silicon dioxide, and European Patent No. 1,057,554 discloses a technique for producing a molding mold and a core by the use of a two-component binder system containing an alkyl silicate and a silicate oligomer. alkyl. However, the inorganic binder described above has been developed by the addition of various additives to water glass, which is the main material, and is environmentally friendly and improved in moldability and processability. fluidity, but its resistance to water is low because of the hygroscopic property of the water glass. Therefore, the problems of the inorganic binder described above are swelling, decreased mechanical strength and elution caused by moisture, therefore it can not be used in climates where the temperature and humidity are high . In addition, the inorganic molding binder is in a liquid form based on water glass (xSiO 2 -YNa 2 O) and lacks thermal property and thermal resistance. As a result, sand is calcined due to sand remaining on a metal surface during disassembly of the moldings. In this regard, Korean Patent Publication Laid-Open No. 10-2013-0 102 982 discloses a technique for avoiding calcination of sand by the addition of a spherical iron oxide. In addition, Korean Patent No. 10-1,027,030 discloses a technique for increasing the mechanical strength of a core and avoiding calcination of sand by the separate introduction of SiO 2 dispersed in a liquid. As described above, a technique for avoiding calcination of sand by the addition of a sand anti-calcination granular additive has contributed immensely to the commercialization of environmentally friendly inorganic binders, but their use has avoided on industrial sites due to the addition of a process for productivity and safety of additive management and binder storage.
    [0002] Therefore, from the foregoing, the inventors of the present disclosure have developed a composition comprising an environmentally friendly, marketable, inorganic binder for molding, which composition exhibits good fluidity, and its mechanical strength and resistance to abrasion. the water is increased to be suitable for climates where the temperature and humidity are high, and which is improved in terms of sand calcination by the inclusion of nano-silica, a water-resistant additive based Li, an organic silicon compound and an anti-calcination additive for sand in a waterglass, and the inventors have completed the present disclosure. Accordingly, it is an object of the present disclosure to provide a composition comprising an inorganic binder for molding. Another object of the present disclosure is to provide a core made using the composition comprising an inorganic binder for molding. Another object of the present disclosure is to provide a mold made to include the core.
    [0003] According to one aspect for attaining an object of the present disclosure, there is provided a composition comprising an inorganic binder for molding, comprising: a water-soluble glass at 40 to 70 parts by weight; nano-silica at 5 to 35 parts by weight; a water-resistant Li-based additive at a rate of 0.1 to 10 parts by weight; an organic silicon compound in an amount of 0.1 to 10 parts by weight; and an anti-calcination additive of sand at 1 to 10 parts by weight. In addition, the water glass may comprise 25% to 36% SiO 2 by weight and 7% to 15% by weight Na 2 O. In addition, the water-resistant additive based on Li may comprise one or more compounds chosen from lithium carbonate, lithium silicate, lithium hydroxide, lithium sulphate, lithium bromide and lithium acetate. In addition, the organic silicon compound may comprise one or more compounds selected from methyltriethoxysilane, sodium methylsiliconate, methyltrimethoxysilane, potassium methylsiliconate, butyltrimethoxysilane and vinyltrimethoxysilane. In addition, the anti-calcination additive of the sand may comprise one or more compounds selected from monosaccharides, polysaccharides and disaccharides. In another aspect for achieving an object of the present disclosure, there is provided a core made using the composition comprising an inorganic binder for molding.
    [0004] In another aspect to achieve an object of the present disclosure, there is provided a molding fabricated to include the core. According to the present disclosure, the composition comprising an inorganic binder for molding increases the mechanical strength and water resistance by increasing an amount of Si, while maintaining the fluidity of the mixed sand when a sand molded part. and a core are manufactured and, therefore, work efficiency is improved and the organic binder can be marketed. In addition, since the inorganic binder is used, the sand molded part and the core can be manufactured in an environmentally friendly manner.
    [0005] Furthermore, since the composition comprising an inorganic molding binder according to the present disclosure is used, the surface energy between a molten metal and a molding decreases as molding is made and the calcination of the sand is avoided by carbonization of the moldings. saccharides caused by hot molten metal. Fig. 1 is a photograph of an inorganic binder dissolved in an aqueous solution prepared according to an embodiment of the present disclosure; Figure 2 is a graph illustrating the seasonal temperature and humidity distribution at Ulsan in 2013; Fig. 3 is a photograph of a core made using an inorganic binder without including a sand anti-calcination additive according to one embodiment of the present disclosure; Fig. 4 is a photograph of a core made using an inorganic binder containing a sand anti-calcination additive of monosaccharides according to one embodiment of the present disclosure; Figure 5 is a photograph of a core made using an inorganic binder containing a polysaccharide sand anti-calcination additive in accordance with one embodiment of the present disclosure; Fig. 6 is a graph illustrating the mechanical strength of cores made with inorganic binders in which a Li-based water-resistant additive is blended according to an embodiment of the present disclosure; Fig. 7 is a graph illustrating the mechanical strength of cores made with inorganic binders in which nano-silica is mixed according to an embodiment of the present disclosure; Fig. 8 is a graph illustrating the mechanical strength of cores made with inorganic binders in which an organic silicon compound is mixed according to an embodiment of the present disclosure; FIG. 9 is a graph illustrating the mechanical strength of cores made with inorganic binders in which a Li-based water-resistant additive, nano-silica, an organic silicon compound and a sand anti-calcination additive are all mixed together. according to an embodiment of the present disclosure; Fig. 10 is a graph illustrating the water resistance of cores made with inorganic binders in which a Li-based water-resistant additive, nano-silica, an organic silicon compound and an anti-calcination additive; sand are all mixed according to one embodiment of the present disclosure; and Fig. 11 is a graph illustrating the properties of a core fabricated according to an embodiment of the present disclosure and a core made using a conventional commercial inorganic binder. The present disclosure relates to a composition comprising an inorganic binder for molding and, more particularly, a composition comprising an inorganic binder for molding which is environmentally friendly, whose mechanical strength and water resistance are increased in order to be adapted to a climate where the temperature and humidity are high, and which is improved in terms of sand calcination by the inclusion of nano-silica, a water-resistant additive based on Li, a silicon compound organic and an additive anti-calcination of sand in a soluble glass. Hereinafter, the present disclosure will be described in detail.
    [0006] In one aspect, the present disclosure relates to a composition comprising an inorganic binder for molding, comprising: a water-soluble glass at 40 to 70 parts by weight; nano-silica at 5 to 35 parts by weight; a water-resistant Li-based additive at 0.1 to 10 parts by weight; an organic silicon compound in an amount of 0.1 to 10 parts by weight; and an anti-calcination additive of sand at 1 to 10 parts by weight. Specifically, the soluble glass comprises SiO 2 at 25% to 36% by weight and Na 2 O at 7% to 15% by weight. In addition, nano-silica is a particle of silicon dioxide (SiO2) having a size of 5 to 20 nanometers, and micropores are formed so as to be parallel to the surface of the particle where the pores have irregular directions . Therefore, it is difficult for a foreign substance to enter the pores. Further, when the nano-silica is synthesized with the water glass, the mechanical strength can be improved by increasing the amount of Si, and the water resistance and hydrophobicity of a composition comprising a binder. can be improved through a structure of the nano-silica particle. Here, if the nano-silica is included in an amount of greater than 35 parts by weight, the fluidity of the inorganic binder decreases and the excess of silica particles inhibits the curing process. Therefore, preferably, the nano-silica may be included in an amount of 5 to 35 parts by weight. In one embodiment, the Li-based water-resistant additive comprises one or more compounds selected from lithium carbonate, lithium silicate, lithium hydroxide, lithium sulfate, lithium bromide and the like. lithium acetate. The Li-based water-resistant additive is stable at room temperature and has a low viscosity even when the SiO 2 has a concentration as high as that of the water glass and a molar ratio is close to 8. In addition, the water-resistant additive Based on Li has a mixed alkaline effect with Na ions in the waterglass and, therefore, the chemical durability of the finished inorganic binder can be increased and the water resistance can be improved. Here, if the Li-based water-resistant additive is included in an amount of greater than 10 parts by weight, a network structure of the inorganic binder disintegrates, resulting in a decrease in chemical durability and resistance to corrosion. 'water. Therefore, preferably, the Li-based water-resistant additive may be included in an amount of 0.1 to 10 parts by weight in the inorganic binder of the present disclosure. In one embodiment, the organic silicon compound comprises an organic functional group chemically bonded to an organic substance and a hydrolysis group that can react with an inorganic substance in the same molecule, so that the organic silicon compound can combine the organic substance with the inorganic substance. Therefore, the mechanical strength and water resistance of the inorganic binder of the present disclosure can be improved, so that the inorganic silicon compound imparts a hydrophobic property. Preferably, the organic silicon compound may comprise one or more compounds selected from tetraethoxysilane, methyltriethoxysilane, sodium methylsiliconate, methyltrimethoxysilane, potassium methylsiliconate, butyltrimethoxysilane and vinyltrimethoxysilane. More preferably, the organic silicon compound may be included in an amount of 0.1 to 10 parts by weight in the inorganic binder. This is because if the organic silicon compound is included in an amount of greater than 10 parts by weight, the price of the inorganic binder may increase and the property of the composition comprising a finished inorganic binder may deteriorate.
    [0007] In one embodiment, the anti-calcination additive of sand comprises one or more compounds selected from monosaccharides, polysaccharides and disaccharides. Preferably, the monosaccharides may comprise one or more compounds selected from dextrose, fructose, mannose, galactose and ribose; the polysaccharides may comprise one or more compounds selected from starch, glycogen, cellulose, chitin and pectin; and the disaccharides may comprise one or more compounds selected from maltose, sugar and lactose. In addition, in one embodiment, the inorganic binder composition may further comprise an inorganic additive or a curing agent to further enhance the strength, flexibility, and hardness of the inorganic binder. In this case, preferably, the curing agent may comprise one or more compounds selected from sodium hydroxide, sodium carbonate, potassium hydroxide, potassium carbonate, sodium phosphate, sodium phosphate, and the like. disodium, trisodium phosphate and sodium sulfate. In addition, the amount of curing agent added is excessive, the hydrophilic property of the inorganic binder increases, resulting in a decrease in the water resistance of the inorganic binder. Therefore, more preferably, the curing agent may be included in an amount of 0.1 to 5.0 parts by weight based on the total weight of the composition comprising an inorganic binder. As such, as the composition comprising an inorganic binder of the present disclosure comprises nano-silica, Li-based water-resistant additive, organic silicon compound and saccharides as additives in the waterglass, bond strength of the composition comprising an inorganic binder increases in the composition comprising a binder, which improves the binder strength and the water resistance and the hydrophobicity of the binder composition, together with an increase in the binder strength. connection with water. Therefore, the composition comprising an inorganic binder can be completely dissolved in an aqueous solution. In this regard, Fig. 1 is a photograph of an inorganic binder dissolved in an aqueous solution prepared according to an embodiment of the present disclosure. Referring to Figure 1, excellent solubility of the composition comprising a binder of the present disclosure can be observed. Since the composition comprising an inorganic binder dissolves completely in an aqueous solution, when a core is made using the composition comprising an inorganic binder of the present disclosure, the binding force with the sand can be improved when the core is fabricated. and it is possible to make a core and molding having excellent mechanical strength and water resistance, and in which calcination of sand is prevented. In particular, the present disclosure satisfies the need for water resistance and high temperature and high moisture strength. Therefore, the present disclosure has a strength greater than or equal to 60% of the initial strength after exposure to a temperature of 30 ° C to 40 ° C and a relative humidity of 60% to 70% ( absolute humidity from 20 g / m3 to 30 g / m3) for 3 hours. Figure 2 illustrates the seasonal temperature and humidity distribution at Ulsan, South Korea, in 2013. Referring to Figure 2, it can be seen that a core and a molding made with the binder inorganic material produced by another company break at an absolute humidity of 15 g / m3 or more, while a core and a molding made with the inorganic binder of the present disclosure retain a handling strength at an absolute humidity of 30 g / m3. Therefore, more preferably, the present disclosure may have a strength greater than or equal to 60% of initial strength after exposure to 38 ° C and 65% relative humidity (relative humidity). absolute of 30 g / m3) for 3 hours. In another aspect, the present disclosure provides a core made using the composition comprising an inorganic binder for molding.
    [0008] In another aspect, the present disclosure provides a molding fabricated to include the core. Since the composition comprising an inorganic binder for molding comprises both the Li-based water-resistant additive, the nano-silica, the organic silicon compound and the anti-calcination additive of sand in the water glass, core and molding made using the composition comprising an inorganic binder is improved in terms of mechanical strength, fluidity, water resistance, sand removal and sand calcination.
    [0009] Hereinafter, the present disclosure will be described in detail with reference to examples, but the scope of the present disclosure is not limited thereto. Example 1. Preparation of an inorganic binder soluble glass If the amount of Si in an inorganic binder is increased, the hardness and strength will increase during a curing process. However, the viscosity and flexibility, as a resin property, of a solid inorganic binder, and workability decrease, so that the inorganic binder may have properties similar to those of a glass. If the amount of Na is increased, the solubility in the water will increase. As a result, the properties of the inorganic binder are good, but during a drying process, its physical properties, such as water resistance, strength, and hardness, deteriorate. Therefore, in the present example, the waterglass was prepared taking into account the properties described above, and its components were analyzed by XRF, as shown in the following Table 1. Table 1 Component Example 1 Si 79.8 Na 19.7 Al 0.24 K 0.17 Fe 0.08 Example 2. Change in hygroscopic property of the inorganic binder by mixing with an additive Example 2-1. Mixture with a Li-Based Water-Resistant Additive A Li-based water-resistant additive was added to the waterglass prepared in Example 1 to synthesize an inorganic binder. Then, the hygroscopic property was evaluated. After drying a predetermined amount (0.05 g) of sample, the weight was measured. Then 20 ml of distilled water was added and the sample deposition was made. After 48 hours, the amount (%) of remaining inorganic binder was observed to verify a change in the hygroscopic property of the inorganic binder. The results are shown in the following Table 2.
    [0010] Table 2 Component name Sample 1 Sample 2 Sample 3 Sample 4 Soluble glass 95 90 85 80 Li-based water-repellent additive 5 10 15 20 Residual content of binder (%) 8.23 91.16 98.83 98.47 Viscosity (cps) 32 42 456 1460 Example 2-2. Mixing with nano-silica Nano-silica was added to the waterglass prepared in Example 1 to synthesize an inorganic binder. Then, the hygroscopic property was evaluated by the same method as in Example 2-1. The results are shown in the following Table 3. Table 3 Component Name Sample 5 Sample 6 Sample 7 Sample 8 Soluble Glass 90 80 70 60 Nano-silica 10 20 30 40 Residual Binder (%) 3.63 8.23 98.27 99.64 Viscosity (cps) 22 42 234 1840 Example 2-3. Mixing with an Organic Silicon Compound An organic silicon compound was added to the waterglass prepared in Example 1 to synthesize an inorganic binder. Then, the hygroscopic property was evaluated by the same method as in Example 2-1. The results are shown in the following Table 4.
    [0011] 3029908 12 Table 4 Component name Sample Sample Sample Sample 9 10 11 12 Soluble glass 95 90 85 80 Organic silicon compound 5 10 15 20 Residual binder rate 8.23 4.56 10.7 10.76 (%) Viscosity ( cps) 62 42 32 16 In Example 2, the hygroscopic property of the inorganic binder mixed with an additive was evaluated.
    [0012] In Example 2-1, the inorganic binder was synthesized by adding the Li-based water-resistant additive to the waterglass. Referring to Table 2, it can be seen that as the amount of Li-based water-resistant additive increases, the residual binder level and viscosity increase. Therefore, it can be seen that for the amount of Li-based water-resistant additive increases, water resistance and viscosity increase. In addition, in Example 2-2, the inorganic binder was synthesized by adding nano-silica to the waterglass. Referring to Table 3, it can be seen that as the amount of silicon constituting the organic binder increases, the residual binder level and viscosity increase. Therefore, it can be seen that as the amount of nano-silica increases, water resistance and viscosity increase. In addition, in Example 2-3, the inorganic binder was synthesized by adding the organic silicon compound to the water glass. Referring to Table 4, it can be seen that the change in residual binder level as a function of the change in the amount of the organic silicon compound is small, the organic silicon compound not contributing greatly to improving the strength to the water of the inorganic binder, but as the amount of organic silicon compound increases, the viscosity decreases.
    [0013] EXAMPLE 3 Evaluation of the Sand Calcination Enhancement of the Inorganic Binder Example 3-1. Organic binder without anti-sand calcination additive An inorganic binder was prepared by adding a water-resistant Li-based additive, nano-silica and an organic silicon compound to the waterglass prepared in Example 1 and synthesizing it. . A core was made using the prepared inorganic binder and AFS 55 sand from Vietnam, and a core sample having a rectangular shape of 175 x 22.4 x 22.4 mm (L x 1 x H) was manufactured in Mixing the binder at 1% to 4% with respect to the sand. Then, a low pressure molding process was carried out to check whether sand calcination occurred or not. The results are shown in Fig. 3. Referring to Fig. 3, it can be seen that the binder is in a liquid form based on the water glass and lacks thermal property and heat resistance. As a result, the sand is calcined, the sand remaining on a metal surface. Example 3-2. Inorganic binder containing sand anti-calcination additive The binder prepared in Example 3-1 was synthesized with monosaccharides or polysaccharides in an amount of 1% to 10% as an anti-calcination additive for sand, and then a sample was prepared by the same method as that of Example 3-1 and a low pressure molding process was carried out to test sand calcination.
    [0014] The results are shown in Figure 4 and Figure 5. Figure 4 illustrates the case where monosaccharides are added and Figure 5 illustrates the case where polysaccharides are added. Referring to FIG. 4 and FIG. 5, it can be seen that no calcination of sand occurs in the inorganic binders, respectively, containing the monosaccharides and the polysaccharides as sand anti-calcination additive. . It is believed that the added polysaccharides and monosaccharides are carbonized as they come into contact with the molten metal, which reduces the surface energy on the molding surface and thus prevents the occurrence of sand calcination.
    [0015] EXAMPLE 4. Change in mechanical strength of a core made using an inorganic binder After making cores using the inorganic binders prepared in Examples 2-1 to 2-3, the change in strength of each kernel was measured. That is, the cores were fabricated from samples 1-12 made using the inorganic binders prepared by adding the Li-based water-resistant additive, the nano-silica, and the organic silicon compound to the examples 2-1 to 2-3. In addition, the inorganic binders were prepared to contain both the Li-based water-resistant additive, the nano-silica, the organic silicon compound and the anti-calcination additive of the sand, by adding Li-based water-resistant additive, nano-silica and organic silicon compound in samples 1 to 12 prepared in Examples 2-1 to 2-3, and mixing them with the anti-calcination additive of the sand. Then, the cores were made using the inorganic binders and the change in strength was measured. For the manufacture of the cores and the measurement of the mechanical strength change, mixed sand was prepared by mixing each of the inorganic binders at 1% to 4% relative to the Vietnam AFS 55 sand in a molding sand mixer ( YOUNGJIN MACHINERY CO., LTD), and the prepared blended sand was formed into a core having a rectangular shape of 175 x 22.4 x 22.4 (L x I x H) using a blending machine. core fabrication (YOUNGJIN MACHINERY CO., LTD) for molding. Then, a compressive strength test was carried out according to the KS A 5304 standard.
    [0016] Example 4-1. Measurement of core strength versus the amount of Li-based water-resistant additive The cores were made using inorganic binder samples 1-4 synthesized by varying the amount of the Li-based water-resistant additive. of example 2-1. The nuclei made using the samples were referred to as nucleus 1 to core 4, respectively. The mechanical strength of each of the cores was measured and the results are shown in FIG. 6. Referring to FIG. 6, as the mechanical strength of the core increases due to the Li-based water-resistant additive, it can be seen that the mechanical strength of the core 2 is three times higher than the strength of the core 1. Furthermore, it can be seen that although the core 3 contains a larger amount of Li-based water-resistant additive than the core 2, its mechanical strength is lower than that of core 2. It is believed that, as shown in Example 2-1, as the amount of Li-based water-resistant additive increases, the viscosity of the inorganic binder increases. and, as a result, the fluidity of the sand decreases, resulting in a decrease in the filling capacity of the core.
    [0017] Example 4-2. Measurement of Core Strength vs. Amount of Nano-Silica The cores were made using inorganic binder samples 5-8 synthesized by varying the amount of nano-silica of Example 2-2. The nuclei made using the samples were called ring core 8, respectively. The mechanical strength of each of the cores was measured and the results are shown in FIG. 7. Referring to FIG. 7, it can be seen that increasing the amount of nano-silica improves the mechanical strength of the core, but if the amount of nanosilica is greater than a predetermined amount, the mechanical strength decreases.
    [0018] It is believed that, as shown in Example 2-2, as the amount of nano-silica increases, the viscosity increases and an excessive amount of silica particles is present, therefore the curing process of the inorganic binder is inhibited . In addition, it is estimated that the excess nano-silica does not react sufficiently during the process of synthesis of the inorganic binder.
    [0019] Example 4-3. Measurement of core strength versus amount of organic silicon compound The cores were made using inorganic binder samples 9 to 12 synthesized by varying the amount of organic silicon compound of Example 2 3. The nuclei made using the samples were called core core 9, respectively. The mechanical strength of each of the cores was measured and the results are shown in FIG.
    [0020] Referring to Figure 8, it can be seen that the amount of the organic silicon compound does not greatly affect the strength of the core. However, as can be seen in Table 4 of Example 2-3, as the amount of organic silicon compound increases, the viscosity decreases. Therefore, it is believed that it is necessary to mix an appropriate amount of the organic silicon compound to make a core having the fluidity required for core molding. Example 4-4. Measurement of core strength versus inclusion of Li-based water-resistant additive, nano-silica, organic silicon compound and sand anti-calcination additive. the Li-based water-resistant additive, the nano-silica, the organic silicon compound and the anti-calcination additive of the sand were obtained by adding the water-resistant additive based on Li, nano and the organic silicon compound in samples 1 to 12 prepared in Examples 2-1 to 2-3, and mixing them with the anti-calcination additive of the sand, and then the cores were made using the inorganic binders. Manufactured cores were referred to as ring core 13, respectively, and the results of measuring the composition and strength of each core are shown in Table 5 and Figure 9. Table 5 Core Name 13 Core 14 Core 15 Core 16 core Binder Sample 1+ Sample 1+ Sample 2+ Sample 1+ inorganic added sample 5+ sample 6+ sample 6+ sample 6+ sample 9+ sample 9+ sample 10+ sample 10+ anti-additive anti-additive anti-additive additive anti-calcination calcination calcination calcination of sand sand sand sand Referring to Table 5 and Figure 9, the inorganic binder made by adding the additive exhibits mechanical strength as the binder inorganic 3029908 17 conventionally used (German company A). This is believed to be due to the fact that the additives complement each other in order to improve the mechanical strength of the core.
    [0021] EXAMPLE 5. Change in Water Resistance of a Core Manufactured Using an Inorganic Binder The cores 13 to 16, as cores manufactured in Example 4-4, were left for 3 hours in a thermohygrostat. with an absolute humidity of 30 g / m3, at a temperature of 38 ° C and a humidity of 65%. Then, the mechanical strength of each core was measured to check the water resistance of the core. The results are shown in Figure 10. Referring to Figure 10, it can be seen that the conventionally used inorganic binder (German Company A) has poor water resistance and, when left for 3 hours at room temperature, an absolute humidity of 30 g / m3, it breaks under its own weight and its mechanical strength decreases and, therefore, it can not be used. On the other hand, the core made with the inorganic binder containing both the Li-based water-resistant additive, the nano-silica, the organic silicon compound and the anti-calcination additive of the sand has a higher mechanical strength than that of the inorganic binder conventionally used (German company A) in the moisture absorption test and does not break under its own weight. In particular, the core 14 and the core 16 have excellent water resistance.
    [0022] Example 6. Evaluation of the properties of a core made using an inorganic binder The properties of the core 16, as the core manufactured in Example 4-4, and the core manufactured using the conventional product of the German company A were compared, the results being shown in Table 6 and Figure 11.
    [0023] 3029908 18 Table 6 Classification German company A Core 16 Mechanical resistance 172.9 233.3 [bending strength N / cm2] Fluidity Good Good Resistance to water 1 hour 3 hours [absolute humidity 30 g / m3] Calcination of Sand Good Good Elimination of sand Good Excellent Referring to Table 6 and Figure 11, it can be seen that core 16, as a core made using the organic binder containing both the water-resistant additive based on Li, the nano-silica, the organic silicon compound and the anti-calcination additive sand, has the physical properties generally improved compared to the core of the German company A. Indeed, it can be seen that the core 16, As a core made using the inorganic binder of one embodiment, has an excellent mechanical strength of 233.3 N / cm 2, which is 60.4 N / cm 2 higher than that of the core of the invention. German company A, and its Physical properties are improved in terms of fluidity, sand calcination and sand removal. In particular, it can be seen that, as far as water resistance is concerned, the core 16 as a core made using the inorganic binder of the present disclosure exhibits excellent mechanical strength even after having spent 3 hours at a time. absolute humidity of 30 g / m3 and does not break under its own weight, while the core of German company A has excellent mechanical strength after spending only 1 hour under the same conditions. Therefore, it can be seen that the water resistance of the core made using the inorganic binder of the present disclosure is remarkably improved over that of the conventional kernel of the German company A. Referring to the above-mentioned results, It is believed that since the inorganic molding binder according to the present disclosure contains both the Li-based water-resistant additive, the nano-silica, the organic silicon compound and the anti-calcination additive of sand in the soluble glass, mechanical strength and water resistance can be improved while maintaining fluidity, and sand can be easily removed by preventing the occurrence of sand calcination and, therefore, work efficiency. can be improved and the inorganic binder can be marketed.
    [0024] Furthermore, it is believed that, with the use of the inorganic binder of the present disclosure, an environmentally friendly molding and core can be made and whose mechanical strength, fluidity, water resistance sand removal and calcination of sand are generally improved. According to the present disclosure, the composition comprising an inorganic molding binder increases mechanical strength and water resistance by increasing the amount of Si while maintaining the fluidity of the mixed sand when a sand molded piece and a core are made. and, therefore, work efficiency is improved and the inorganic binder can be marketed. In addition, with the use of the inorganic binder, a sand molded part and a core can be manufactured in an environmentally friendly manner. In addition, with the use of the composition comprising an inorganic molding binder according to the present disclosure, the surface energy between a molten metal and a molding decreases when the molding is made and the calcining of the sand is prevented by the carbonization of the saccharides. caused by the hot molten metal. Although the present disclosure has been described with respect to specific embodiments, it will be apparent to those skilled in the art that various changes and modifications may be made without departing from the spirit and scope of the invention. invention as defined in the following claims.
    权利要求:
    Claims (5)
    [0001]
    REVENDICATIONS1. A composition comprising an inorganic binder for molding, comprising: a water-soluble glass at 40 to 70 parts by weight; nano-silica at 5 to 35 parts by weight; a water-resistant Li-based additive at 0.1 to 10 parts by weight; an organic silicon compound in an amount of 0.1 to 10 parts by weight; and an anti-calcination additive of sand at 1 to 10 parts by weight.
    [0002]
    A composition comprising an inorganic molding binder according to claim 1, characterized in that the water glass comprises SiO 2 in a proportion of 25% to 36% by weight and Na 2 O in a proportion of 7% to 15% by weight.
    [0003]
    3. Composition comprising an inorganic molding binder according to claim 1, characterized in that the Li-based water-resistant additive comprises one or more compounds chosen from lithium carbonate, lithium silicate, lithium hydroxide, lithium lithium sulphate, lithium bromide and lithium acetate.
    [0004]
    4. Composition comprising an inorganic binder for molding according to claim 1, characterized in that the organic silicon compound comprises one or more compounds chosen from methyltriethoxysilane, sodium methylsiliconate, methyltrimethoxysilane, potassium methylsiliconate, butyltrimethoxysilane and vinyltrimethoxysilane.
    [0005]
    5. Composition comprising an inorganic molding binder according to claim 1, characterized in that the anti-calcination additive of the sand comprises one or more compounds chosen from monosaccharides, polysaccharides and disaccharides. A core fabricated using a composition comprising an inorganic binder according to any one of claims 1 to 5. 7. A mold manufactured to include a core according to claim 6.
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    同族专利:
    公开号 | 公开日
    CA2910387C|2016-05-31|
    KR101527909B1|2015-06-10|
    CN105127360B|2016-09-28|
    MX2017008092A|2018-05-04|
    CN105127360A|2015-12-09|
    CA2910387A1|2015-12-29|
    JP2017536989A|2017-12-14|
    ITUB20155853A1|2017-05-24|
    HK1212291A1|2016-06-10|
    US20160167113A1|2016-06-16|
    DE102015118159A1|2016-06-16|
    FR3029908B1|2021-12-24|
    WO2016099007A1|2016-06-23|
    US9433997B2|2016-09-06|
    JP6465976B2|2019-02-06|
    引用文献:
    公开号 | 申请日 | 公开日 | 申请人 | 专利标题
    US4162238A|1973-07-17|1979-07-24|E. I. Du Pont De Nemours And Company|Foundry mold or core compositions and method|
    US4316744A|1973-07-17|1982-02-23|E. I. Du Pont De Nemours And Company|High ratio silicate foundry sand binders|
    US4347890A|1981-03-09|1982-09-07|Pq Corporation|Method for binding particulate materials|
    US5911269A|1992-11-16|1999-06-15|Industrial Gypsum Co., Inc.|Method of making silica sand molds and cores for metal founding|
    JPH0797244A|1993-09-28|1995-04-11|Tokiwa Electric Co Ltd|Water glass composition|
    DE19925115A1|1999-06-01|2000-12-07|Huettenes Albertus|Binder system for molding material mixtures for the production of molds and cores|
    US7147725B2|2003-12-04|2006-12-12|Lincoln Global, Inc.|Colloidal silica binder system|
    DE102004042535B4|2004-09-02|2019-05-29|Ask Chemicals Gmbh|Molding material mixture for the production of casting molds for metal processing, process and use|
    CN100503081C|2006-07-18|2009-06-24|沈阳汇亚通铸造材料有限责任公司|Adhesive for casting mold, manufacturing core and method of manufacturing the same|
    HUE029506T2|2006-10-19|2017-02-28|Ask Chemicals Gmbh|Moulding material mixture containing carbohydrates|
    DE102007027577A1|2007-06-12|2008-12-18|Minelco Gmbh|Molding material mixture, molded article for foundry purposes and method for producing a molded article|
    DE102007051850A1|2007-10-30|2009-05-07|Ashland-Südchemie-Kernfest GmbH|Molding compound with improved flowability|
    JP5290125B2|2008-10-24|2013-09-18|新日鐵住金株式会社|Bonding agent for amorphous refractory and amorphous refractory|
    MX339544B|2008-12-18|2016-05-31|Tenedora Nemak Sa De Cv|Method and composition of binder for manufacturing sand molds and/or cores for foundries.|
    KR101199111B1|2009-10-30|2012-11-09|현대자동차주식회사|Core material mixture for casting, method for manufacturing core for casting and core for casting using the same|
    DE102011114626A1|2011-09-30|2013-04-04|Ask Chemicals Gmbh|Coating materials for inorganic molds and cores and their use|
    DE102011115025A1|2011-10-07|2013-04-11|Ask Chemicals Gmbh|Coating compositions for inorganic casting molds and cores containing salts and their use|
    KR101471364B1|2012-03-09|2014-12-10|김연숙|Manufacturing method of iron oxide additive for casting using rolling scarping dust.|
    DE102012103705A1|2012-04-26|2013-10-31|Ask Chemicals Gmbh|Method for producing molds and cores for casting metal, and molds and cores produced by this method|
    WO2015029935A1|2013-08-30|2015-03-05|旭有機材工業株式会社|Molding method for laminated mold|
    CN103586397A|2013-11-27|2014-02-19|吴江市液铸液压件铸造有限公司|Casting sand for casting stainless steel end enclosure|JP6593255B2|2016-06-06|2019-10-23|新東工業株式会社|Binder composition for mold, aggregate mixture for mold, mold, and method for forming mold|
    DE102016110752A1|2016-06-10|2017-12-14|Dr Axion Co., Ltd.|BINDER COMPOSITION FOR FORGING|
    CN106862480B|2017-01-23|2019-03-12|中国第一汽车股份有限公司|A kind of high mode inorganic binder|
    CN108393430B|2017-02-04|2020-05-08|济南圣泉集团股份有限公司|Curing agent for casting sodium silicate|
    CN106955966B|2017-04-07|2019-05-03|郑宏伟|A kind of casting inorganic binder and preparation method thereof|
    CN107243592B|2017-05-16|2018-11-02|浙江遂金特种铸造有限公司|Inorganic nano particle modified waterglass and preparation method thereof|
    CN108097867B|2017-12-28|2020-06-09|济南圣泉集团股份有限公司|Moisture absorption resistant adhesive and preparation method and application thereof|
    KR101948022B1|2018-02-20|2019-05-02|주식회사 디알레보텍|Inorganic binder composition for casting and core using the same|
    KR102107118B1|2018-08-23|2020-05-06|한국생산기술연구원|Lithium-containing inorganic binder having a specific molar ratio|
    KR102084323B1|2018-08-30|2020-03-04|한국생산기술연구원|An inorganic binder for casting including phosphate, metal, and pH adjusting agent and a process for producing a mold including the binder|
    CN109695162B|2019-01-30|2022-02-08|山东科技大学|Organic-inorganic coating material composition for casting filter screen and application thereof|
    KR102136575B1|2019-06-19|2020-07-22|한국생산기술연구원|An inorganic binder for casting containing vegetable wax and method for preparing the same|
    CN110640078B|2019-09-29|2021-02-02|佛山市高明利钢精密铸造有限公司|Molding sand binder for casting|
    KR20210039117A|2019-10-01|2021-04-09|주식회사 디알레보텍|Inorganic binder composition for casting and core using the same|
    CN110653329A|2019-11-28|2020-01-07|含山县能华铸造有限公司|Method for improving performance of casting molding sand by composite micro powder|
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    优先权:
    申请号 | 申请日 | 专利标题
    KR1020140181648A|KR101527909B1|2014-12-16|2014-12-16|inorganic binder composition for castings|
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