• 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 invention relates to a method for heat treatment and impregnation of wood or other woody materials with the use of recycled oil. The treatment method of oleothermia with recycled oil proposed uses recycled oil from agro-food industries, the oil is filtered to remove solid impurities and heated to a temperature higher than 150º c. The treatment is by immersing the wood in the recycled oil heated to the desired temperature maintaining said temperature a minimum time of 60 minutes, then the wood is removed and allowed to cool to hygroscopic equilibrium humidity at room temperature. The proposed method improves the dimensional stability of the wood and decreases its hygroscopicity, it achieves a more stable wood for outdoor use and that is less prone to the formation of fences and warping. It should be noted that it is a simple, ecological and lower cost method than traditional heat treatment methods and other methods of oht (oil heat treatment). (Machine-translation by Google Translate, not legally binding)
    公开号:ES2619325A1
    申请号:ES201600019
    申请日:2015-12-23
    公开日:2017-06-26
    发明作者:Milagros CASADO SANZ；Luis ACUÑA RELLO
    申请人:Universidad de Valladolid；
    IPC主号:
    专利说明:

    DESCRIPTION

    Method for treating wood by oleothermia with recycled oils.

    Technical Field of the Invention 5

    The technical field of the invention is the treatment of wood or other woody materials to improve the durability of the wood.

    State of the art 10

    The most used methods to achieve a high degree of penetration of the protective product in the wood are autoclave treatments, the main drawback is the use of installations with pressure and vacuum pumps that require high investment costs and longer treatment times. The search for new methods 15 of simpler, ecological and lower cost treatments has developed the treatment of oleothermal OHT (Oil Heat Treatment) as one of the techniques of thermal modification of the wood, which is applied to improve the durability of the wood .

    For thermal modification, the wood is heated in different conditions with; steam 20 (Dwianto et al. 1996), nitrogen gas (Jermannaud et al 2002; Dirol and Guyonnet 1993) and vegetable oils (Sailer & Rapp 2001, Tjeerdsma et al 2005; Dubey et al 2011).

    Due to the heat treatment, the chemical structure of the wood changes and also its physical and mechanical properties, thus achieving greater durability compared to the biodegradation of the wood (Sailer & Rapp 2001; Tjeerdsma et al 2005; Windeisen et al 2007; Kartal et. al., 2008; Dubey et al 2010).

    In recent years, numerous oleothermal treatment processes have been developed that improve dimensional stability, decrease hygroscopicity and increase durability against biodegradation. Recently published works of OHT use different vegetable oils such as; Flaxseed, soy, palm and soybeans among others, subjecting the wood to immersion in these oils at temperatures of 160ºC to 220ºC for more than an hour (Tjeerdsma et al 2005; Bak & Németh 2012; Mukam & Simon 2012; Fang et al 2011 and 2012; Bazyar 2012; Dubey et al 2012; Wang et al 2014; Mohebby 35 et al 2014, among others), in all cases point out that it improves dimensional stability against moisture changes in addition to increasing resistance to rot fungi . In some cases, the application of high temperatures causes the reduction of mechanical properties (Gundúz et al 2009), although oleothermal treatments cause less degradation of the mechanical structure of the wood than heat treatment (Hill 40 2006).

    There are some recently published OHT patents for immersion of wood in tall oil at temperatures of 200-250º C for 2-5 hours (Tsarev et al 2009), in palm oil at 200-215ºC for 0.5-3 hours ( Guishui et al 2011), patent application 45 EP-A-956,934 describes an impregnation process of wood heated at 350 ° C for 5 minutes in an oven followed by cooling the wood to 20 ° C and immersed in an aqueous solution containing the protective product for one hour. In the case of the patent application ES 2 225 274 T3 it is a process and impregnation device for immersion in wood oil with humidity greater than 25%, comprising two stages; a hot oil bath maintained at a temperature between 110 and 150 ° C (according to the examples for 60 minutes) and a cold bath at a temperature below 90 ° C (30 minutes according to the patent example).

    Bibliography

    Bak M., Nemeth R. (2012). "Changes in swelling properties and moisture uptake rate of oil-heat-treated poplar (Populus x euramericana cv. Pannónia) wood". BioResources 7 (4), 5128-5137. 5

    Bazyar B. (2012) "Decay resistance and physical properties of oil heat treated aspen wood". BioResources 7 (1), 696-702.

    Boonstra M, Rijsdijk F, Sander C, Kegel E, Tjeerdsma B, Militz H, Van J, Stevens M 10 (2006a). "Microstructural and physical aspects of heat treated wood. Part 1. Softwoods" Maderas Cienc Tecnol 8: 193-208.

    Boonstra M, Rijsdijk F, Sander C. Kegel E, Tjeerdsma 8, Militz H, Van J, Stevens M (2006b). "Microstructural and physical aspects of heat treated wood. Part 2. Hardwoods". 15 Woods Cienc Tecnol 8: 209-217.

    Dwianto W, Tanaka F, lnoue M. Norimoto M (1996). "Crystallinity changes of wood by heat or steamtreatment". Wood Res 83: 47-49.
     twenty
    Dirol D, Guyonnet R (1993). "The improvement of wood durability by ratification process". The International Research Group on Wood Preservation IRG Document No. IRG / WP93-40015.

    Dubey MK, Pang S, Walker J (2010). "Color and dimensional stability of oil heat-treated 25 radiata pinewood after accelerated UV weathering". For Prod J 60 (5): 453-459.

    Dubey, M.K., Pang, S., Walker, J. (2012). "Changes in chemistr, color, dimensional stability and fungal resistance of Pinus ratiata D. Don wood with oil heart-treatment". Holzforschung 66 (1). 49-57. 30

    Fang C.-H., Cloutier A., Blanchet P., Koubaa A., Mariotti, N. (2011). "Densification of wood veneers combined with oil-heat treatment. Part I: Dimensional stability". BioResources 6 (1), 373-385.
     35
    Fang C.-H., Cloutier A., Blanchet P., Koubaa A. (2012). "Densification of wood veneers combined with oil-heat treatment. Part II: Hygroscopicity and mechanical properties". BioResources 7 (1), 925-935.

    Guishui X., Min L., Xiaowen L., Shaoshan Q., Feng A., Lijun Z., Jikun W. (2009). Wood 40 treatmen method. WO2011025403 (A1).

    Günduz G, Aydemir D, Karakas G (2009). The effect of thermal treatment on the mechanical properties of wild pear (Pyrus elaeagnifolia Pall.) Wood and changes in physical properties. Mater Des 30: 4391-4395. Four. Five

    Hill C (2006). Wood modification, chemical, thermal and other processes. Wiley, Chichester.

    Jermannaud A, Duchez L, Guyannet R (2002). "Wood retification in France: an industrial 50 process of heat treatment producing lumber with improved resistance to decay" In: Proceedings of the enhancing the durability of lumber and engineered wood products. United States, Forest Products Society, pp 121-122.
    KARTAL, S.N .; HWANG, W.J. & IMAMURA, Y. (2008). "Combined effect of boron compounds and heat treatments on wood properties: Chemical and strength properties of woo". J. Mater. Process Tech. 198, 234-240.

    Mirzaei G, Mohebby B, Tasooji M (2012). "The effect of hydrothermal treatment on bond 5 shear strength of beech wood". Eur J Wood Prod 70: 1-5.

    MUKAM FOTSING, J.A., SIMON FOKOUA, A.D. (2012). "Effects of thermal modification by the hot oil treatment process on some physical properties of two cameroonian hardwood species." International Journal of heat and Technology. Volume 30, Issue 2, 43-10 49.

    Mohebby B, Kevily H, Kazemi-Najafi S (2014). "Oleothermal modification of fir wood with a combination of soybean oil and maleic anhydride and its effects on physico-mechanical properties of treated wood. Wood Sci Technol 48: 797-809. 15

    Sailer, M., Rapp, A.O. (2001). "Use of vegetable oils for wood protection". COST Action E22: Environmental optimization of wood protection. Conference in Einbek, Gemany, 8-10 November 2001.
     twenty
    Tjeerdsma BF, Swager P, Horstman BJ, Holleboom BW, Homan WJ (2005) Process development of treatment of wood with modified hot oil. In: European conference on wood modification, Gottingen.

    Tsarev G., Shestou A., Komarou A. (2011). Method for thermally modifying wood by oil 25 palm oil, "CN102152361 (B).

    Wang Y.-M., Ma S.-L., Feng L-Q., (2014). "The influence of oil heat treatment on wood decay resistance by Fourier infrared spectrum analysis". Guang Pu Xue Yu Guang Pu Fen Xi / Spectroscopy and Spectral Analysis 34 (3), 660-663. 30

    Windeisen E, Strobel C, Wegener G (2007) Chemical changes during the production of thermo-treated beech wood. Wood Sci Technol 41 (6): 523-536.

    Description of the invention 35

    The purpose of the present invention patent application is to register a treatment method for wood and wood-derived products, by oleothermia using recycled oil from agri-food industries, which incorporates important advantages over the OHT methods known until now as among others things the temperature and / or the treatment time are lower.

    Detailed description of an embodiment of the invention

    The preferred embodiment of the invention is described below, not limited in scope. The invention refers to a method of treatment by hot immersion in recycled sunflower oil, being able to use any type of residual oil from agri-food industries.

    The hot oil immersion treatment at a temperature above 150ºC improves the dimensional stability, increases the density of the wood, reduces the hygroscopicity of the wood and provides a tan color to the surface of the wood.

    It is an ecological and alternative method to existing chemical treatments and with less duration than published OHT methods.

    It is therefore an object of the present invention to provide a method of treatment by oleothermia in wood by immersion in recycled oil comprising the following steps:

    - Drying of sawn or rolled wood to a humidity below 25%.

    - Heated recycled oil to 60ºC and then filtered with a cloth filter. 10

    - Heating of the filtered recycled oil in a tank with temperature control to a temperature higher than or equal to 150ºC.

    - Submerged from the wood in the hot oil tank at a temperature higher than or equal to 150ºC for at least 60 minutes, maintaining the temperature throughout the treatment and with the wood completely submerged in the oil.

    - After the treatment time, the wood is removed from the oil, allowed to drain and stacked for final drying at room temperature. twenty

    The procedure described above can be applied in an outdoor wood and furniture protection industry, and autoclave pressure methods can be used to increase the absorption and penetration of oil into the wood, in both cases it will be convenient to analyze the ranges of temperature and treatment times 25 depending on the species of wood, dimensions of the pieces, level of penetration that is desired to be achieved, among other parameters of the wood and the type of recycled oil to use.

    By means of the described procedure, the stability of the wood is improved in the face of 30 strong hygrothermal changes, common in exterior wood, reduces the hysteresis of the wood and decreases the contractions of the wood in a marked way, which implies a lower tendency to the appearance of superficial fendas that constitute a way of entry to the penetration of biological agents of wood degradation. In addition another advantage is the change of color providing a toasted hue that highlights the grain of 35 woods with little grain like the wood of the Populus genus. It should be noted that it is a method that uses recycled, ecological and biodegradable products.

    The OHT treatment analyzed is less prolonged in time and at a lower temperature than other studies and an increase in the dimensional stability of poplar wood 40 is achieved by modifying the hydrophilic properties thereof.

    The proposed treatment is effective for wood outside since it provides a hydrophobic character to the wood, so it improves the durability for risk class 3 and 4, it implies a change of color towards a tan tone that highlights the wood grain . The aforementioned method allows the use of a waste from the agri-food industry.

    The advantages of the described procedure are several;
     fifty
    - it is easy to apply,

    - investment and operating costs are low,

    - the slight heat treatment means a relaxation of tensions in the round and sawn wood,

    - adapts to the use of substances that improve water resistance, providing a tan to the wood, 5

    - constitutes an outlet for the reuse of oils from the agri-food industry or by-products from the oil industries,

    - allows to use products with low environmental impacts. 10

    Example of one embodiment of the invention

    For the present example, the treatment has been carried out with Populus x euramerican wood according to the invention using recycled sunflower oil and the immersion process at a temperature of 170 ° C for 60 minutes and subsequently cooled to room temperature. After treatment, physical properties of the wood were analyzed as; density, HEH (humidity of Hygroscopic Balance) in different hygrothermal conditions and total volumetric contraction, compared with control samples without treatment. Wood of a slightly durable species has been used for outdoor use such as 20 is the case of the Populus genus with pieces of small dimensions (6x2x2 mm) and a humidity of 10%.

    After the treatment time, the wooden specimens were removed from the oil, allowed to drain and conditioned again in the laboratory at 20 ° C and 36% of ambient relative humidity. Experimentally it has been found that the OHT treatment in recycled sunflower oil at a temperature of 170 ° C for one hour implies a significant increase in the density of Populus x euramericana-I 214 wood by around 10% compared to the untreated control sample of the In the same way, a 35% reduction in moisture absorption is achieved in said species 30 (relative humidity conditions greater than 75% are common in an outdoor environment).

    It should also be noted that the volumetric contraction is smaller, so while in the control samples they have an average value of 10.7% in the treated specimens the average value is 8.8%. 35
    权利要求:
    Claims (2)
    [1]

    1. Method for treating wood by oleothermia with recycled oils from the agri-food industry characterized in that it comprises the following stages:
     5
    - Drying of sawn or rolled wood to a humidity below 25%.
    - Heated recycled oil to 60ºC and then filtered with a cloth filter.
    - Heating of the filtered recycled oil in a tank with temperature control 10 to a temperature higher than or equal to 150ºC.
    - Immersion of the wood in the hot oil tank at a temperature higher than or equal to 150ºC for at least 60 minutes, maintaining the temperature throughout the treatment. fifteen
    - After the treatment time, the wood is removed from the oil, allowed to drain and stacked at room temperature until it is cooled and conditioned.

    [2]
    2. Method according to claim 1, characterized in that recycled sunflower oil has been used for immersion.
    类似技术:
    公开号 | 公开日 | 专利标题
    Esteves et al.2008|Pine wood modification by heat treatment in air
    ES2611460T3|2017-05-09|Wood acetylation procedure
    Salman et al.2014|Development of new wood treatments combining boron impregnation and thermo modification: effect of additives on boron leachability
    Salman et al.2017|Improvement of the durability of heat-treated wood against termites
    Bazyar2012|Decay resistance and physical properties of oil heat treated aspen wood
    Mitani et al.2014|Changes caused by heat treatment in color and dimensional stability of beech | wood
    Korkut et al.2008|The effects of heat treatment on physical properties of Uludag fir | and Scots pine | wood
    Jebrane et al.2015|Novel hydrophobization of wood by epoxidized linseed oil. Part 1. Process description and anti-swelling efficiency of the treated wood
    Safin et al.2015|Development of the energy-saving technology of thermal modification of wood in saturated steam
    Lesar et al.2013|Influence of the thermo-hydro-mechanical treatments of wood on the performance against wood-degrading fungi
    Laskowska2020|The influence of ultraviolet radiation on the colour of thermo-mechanically modified beech and oak wood
    Jana2013|Fire safety properties of heat treated wood
    ES2619325B1|2018-04-06|Method for treating wood by oleothermia with recycled oils
    Jebrane et al.2018|Comparative study of two softwood species industrially modified by Thermowood® and thermo-vacuum process
    US7836924B2|2010-11-23|Methods for enhancing hardness and dimensional stability of a wood element and wood product having enhanced hardness
    Park et al.2016|Evaluation of physico-mechanical properties and durability of Larix kaempferi wood heat-treated by superheated steam
    Taşdelen et al.2019|Some physical and mechanical properties of maritime pine and poplar exposed to oil-heat treatment
    US8453343B2|2013-06-04|Method of treatment of wooden items
    Saliman et al.2017|Hydrothermal treatment of oil palm wood: Effect of treatment variables on dimensional stability using response surface methodology
    Cai et al.2012|Effects of thermal modification on mechanical and swelling properties and color change of lumber killed by mountain pine beetle
    Mirzaee et al.2012|Collapsibility and wettability of hydrothermally treated wood
    Schauwecker et al.2013|Performance of wood treated with prospective organic surface protectants upon outdoor exposure: FTIR spectroscopic analysis of weathered surfaces
    Tran2013|Improvement of dimensional stability of Acacia mangium wood by heat treatment: a case study of Vietnam
    Saliman et al.2017|Response surface methodology model of hydrothermal treatment parameters on decay resistance of oil palm wood
    Ra et al.2012|Effect of heat treatment conditions on color change and termite resistance of heat-treated wood
    同族专利:
    公开号 | 公开日
    ES2619325B1|2018-04-06|
    引用文献:
    公开号 | 申请日 | 公开日 | 申请人 | 专利标题
    法律状态:
    2018-04-06| FG2A| Definitive protection|Ref document number: 2619325 Country of ref document: ES Kind code of ref document: B1 Effective date: 20180406 |
    优先权:
    申请号 | 申请日 | 专利标题
    ES201600019A|ES2619325B1|2015-12-23|2015-12-23|Method for treating wood by oleothermia with recycled oils|ES201600019A| ES2619325B1|2015-12-23|2015-12-23|Method for treating wood by oleothermia with recycled oils|
    [返回顶部]