• 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 manufacture of particle board, but the other known dry-processes to produce boards from vegetable fibres, such as bagasse, are not excluded, provided, however, that formaldehyde is one constituent of the glue used. The invention is based on the use of modified starch together with the main glue. The starch modificate can be carbamate, ester or ether. These modificates react with the formaldehyde residues left in the board after the setting reaction of the main glue, whereby the emission of the residual formaldehyde is essentially reduced.
    公开号:SU1600622A3
    申请号:SU874202832
    申请日:1987-07-10
    公开日:1990-10-15
    发明作者:Нииниваара Вейкко；Халонен Сеппо；Нурми Кари
    申请人:Ой Касвиелью-Вякстолье Аб (Фирма)；
    IPC主号:
    专利说明:

    The invention relates to wood processing industry and can be used in the manufacture of plates from vegetable fibers.
    The purpose of the invention is to reduce the release of formaldehyde from the plates.
    To bind free formaldehyde, a special additive is added to the plate material. The additive is chosen in such a way that it reacts with formaldehyde more slowly than other components of the adhesive composition. At the same time there are no reactions that reduce the strength of the glue. However, the reactivity of the additive must be sufficient to: immobilize excess formaldehyde remaining after the reaction of curing with glue,
    In addition to formaldehyde-based glue, starch modified to the carbamate, complex or simple zirfir is added to the fiber material as an additive in the process of manufacturing plates, and the modification can be any of these or
    O5
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    Be combined from two of them or all together. In the glue, the molar ratio of the glue components can be chosen based on the condition that the strength of the glue is reached, as well as its dose of glue;
    The carbamate reacts as required in the hot pressing step in the manufacture of plates. However, it does not react too quickly in order not to compete with the curing reactions of the adhesive component.
    Starch ether is prepared using ethylene oxide, propylene oxide or alkylglycid-trimethylammonium chloride as reagents.
    Example 1. 1500 g of water and 1000 g of wheat starch are loaded into the reactor. Sodium hydroxide is added to it until the pH of solution II, 0-12, OO is charged to the reactor in an amount of 150 GO. three times with distilled water so that the solid content of the product is the same as at the beginning of the reaction. The DS number of the product is 0.02, and it is used in the production of chipboard as it is.
    The starch ester can be prepared using acetic acid, acetic anhydride, chloro-acetic acid, maleic acid, maleic anhydride, fumaric acid, and vinyl acetate.
    Example 2: 1500 g of water and 1000 g of wheat starch are loaded into the reactor. Sodium hydroxide is added to the reactor until a pH of 11.0-12.0 ° is reached. Carefully drip, 260 g of acetic acid vinyl ester are loaded into the reactor. To accelerate the reaction, 5 g of sodium sulfate or sodium xpfonate is added dropwise to the reactor. The reaction mixture is stirred for 8 hours at 25-30 ° C, after which the product is washed three times with distilled water, so that the content of the dry solid product remains at the same level as at the beginning of the reaction. 0.04, and it is used when
    manufacture chipboard in the form in which they receive.
    Starch carbamate can be obtained using substituted carbamides as reagents: acetyl carbamide, thiocarbamide, carbonyl diamide
    Example 3,000 g of liquid ammonia is pumped into the reactor. 1000 grams of wheat starch and 400 grams of carbonyldiamide are added. The reaction mixture is stirred for 8 hours at -40 seconds, after which the product is washed three times with distilled water and prepared as a solution in which the dry solids content is about 40% by weight. The product has a DS number of 0.06 and is used for the production of chipboard in the form in which receive.
    Example 4 500 grams of water and 1000 grams of wheat starch are loaded into the reactor. 350 grams of thiocarbamide and 10 potassium acetate are added to accelerate the reaction. The reaction mixture is stirred for 8 hours at 25-30 ° C, after which the product obtained is washed three times with distilled water. The degree of substitution (DS number) of the product is 0.085, and it is used as crawled.
    Example 5 about 1500 g of water and 1000 g of wheat starch are loaded into the reactor. Add 400 g of carbonyl amide and 15 g of potassium acetate to accelerate the reaction. The reaction mixture is stirred for 9 hours at 25-30 ° C, followed by washing the product three times with distilled water. The degree of substitution (DS number) of the product is 0.080, and is used as received
    Example 6 o The process is carried out as in Example 4, but the particle size of the product is reduced using a laboratory colloid mill from 50 µm to values below 2 microMo. This product is used in colloidal form.
    Example 7. The process is carried out as in Example 1, however, the reaction is continued after washing as in Example A, resulting in a product with a degree of substitution (DS number) of 0.02 relative to ether and 0.069 relative to carbamathuds. the product is sold and used as received,
    Example 8. The process is carried out analogously to example 3, but the particle size of the product is reduced from 50 μm to values below 2 μm using a laboratory colloid mill, and used in a colloidal form.
    Example 9 o Similar to example 5, but taking the product after heat treatment and processing in a laboratory colloid mill to the size of particles less than 1 micron; in this form it gives a solution
    Starch derivatives, which are described in Examples 1-9, are added in an amount of 13% of the amount of glue (abs dry / abs dry).
    The species composition of the chips is a mixture of 50% birch and 50% soft wood. The paraffinic product Mobulcer containing 50% of dry matter is used as a hydrophobic agent. Dinorite-143 (urea-aldehyde resin) is used as a glue. Pressing mode 10 s / mm plate; temperature 190 C; pressure of 3 MPa; filler is not used.
    When using simple and / or starch ester, the optimum is a range of 10-50%. The concentration of an aqueous solution of the additive is 68% by weight,%. The temperature of the chips and glue can vary from 10-100 seconds. The pH value of the resin in the range of 4-12 involves the use of various adhesives (MF, MMF, FF).
    The manufacturing characteristics of the plates are as follows: volume weight 670, thickness 16 mm; molar ratio of formaldehyde resin to urea 1.2; the resin content is 8% in the middle layers (abs dry / abs. dry), 11% in the surface layers (ab dry / abs. dry); The plates were tested using standard methods SFS 3516 and DIN 52360-52365.
    The test results of the plates are given in tab. one .
    00622
    In tab. 2 shows the dependence of the formaldehyde content on the dose of the starch derivative.
    In tab. Table 3 shows the results of tests carried out to determine the viscosity of various modifications in different ranges of particle size at a specific dry matter content.
    Starch derivatives can be added in the traditional manufacture of particle boards, either in a mixture with an adhesive component, or, separately, during the processing of the chips with glue. If the addition occurs separately, the temperature of the starch is increased, and the preferred range is 50 -. Good
    201 results are achieved even if starch derivatives are added at lower temperatures.
    I
    Thus, the invention makes it possible to manufacture slabs with a low formaldehyde content.
    权利要求:
    Claims (1)
    [1]
    Invention Formula
    A method of making plates of vegetable fibers, including treating wood shavings with urea-formaldehyde resin, forming a carpet from them, followed by hot pressing, differing
    the fact that, in order to reduce the formaldehyde plates, when treating wood chips with resin, they are additionally treated with a colloidal starch solution modified to carbamate, ether or ester, at 50 - containing 68% of dry matter, in the amount of 0.5-6% of the chip weight, the degree of modification of which is 0.02-0.085 DS, using modified starch with a particle size of 2-50 microns, the pH value of which is A-5.
    1600622iO
    table 2
    Formaldehyde content,
    mg / 100 g (FESYP) 6.36.97.2 7.5 9.110.5 13
    Starch Derivative Dose
    according to example 8,% of glue
    (abs, dry / abs, dry) 131211Ю987
    Viscosity of dispersions, cps (according to Brookfield)
    The content of the dry part of 30%, the average RZ er particles
    ° 400 430 200 350 280 260
    The dry content of 50%,
    particle size below 2 microns 122000 92000 5000 8000 95000 1000
    Table 3
    Example
    Etiir F T
    7
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    USRE13436E|1912-07-02|By gertrude s
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    同族专利:
    公开号 | 公开日
    DD252345A5|1987-12-16|
    DK364587D0|1987-07-13|
    FI87363C|1992-12-28|
    EP0246256B1|1990-01-10|
    DK164690C|1992-12-21|
    EP0246256A1|1987-11-25|
    FI871548A|1987-05-14|
    FI87363B|1992-09-15|
    FI871548A0|1987-04-08|
    DK364587A|1987-07-13|
    DE3668134D1|1990-02-15|
    DK164690B|1992-08-03|
    FI854469A0|1985-11-13|
    WO1987002929A1|1987-05-21|
    引用文献:
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    RU2446044C2|2010-07-08|2012-03-27|Государственное образовательное учреждение высшего профессионального образования "Воронежская государственная лесотехническая академия"|Method of gluing wood materials|
    RU2458954C2|2006-06-23|2012-08-20|Акцо Нобель Коатингс Интернэшнл Б.В.|Adhesive system and method of obtaining wood-based product|
    RU2470050C2|2007-08-10|2012-12-20|Кронотек Аг|Method of reducing emission of aldehydes and volatile organic compounds from wood materials|DE2315145A1|1973-03-27|1974-10-03|Odenwald Faserplatten|Fibre board prodn. from dry components - uses synthetic binder cured by heat and pressure|
    US4212704A|1975-04-10|1980-07-15|Grain Processing Corporation|Composition and production process for Fourdrinier fiberboard|FR2850391B1|2003-01-24|2007-04-20|Roquette Freres|PROCESS AND AQUEOUS ADHESIVE COMPOSITION FOR THE PRODUCTION OF PANELS BASED ON VEGETABLE MATERIALS|
    RU2561445C1|2014-04-22|2015-08-27|Федеральное государственное бюджетное образовательное учреждение высшего профессионального образования "Кубанский государственный технологический университет" |Composition for production of wood chipboards|
    CN106366684A|2016-09-08|2017-02-01|广西南宁桂尔创环保科技有限公司|Novel artificial plate|
    CN106380885A|2016-09-08|2017-02-08|广西南宁桂尔创环保科技有限公司|Novel environment-friendly artificial board|
    CN106380886A|2016-09-08|2017-02-08|广西南宁桂尔创环保科技有限公司|Novel environment-friendly high-performance artificial board|
    法律状态:
    优先权:
    申请号 | 申请日 | 专利标题
    FI854469A|FI854469A0|1985-11-13|1985-11-13|FOERFARANDE FOER FRAMSTAELLNING AV VAEXTFIBERBASERADE SKIVOR.|
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