阅读说明：本技术 一种高耐候性杉木板材的制备方法 (Preparation method of high-weather-resistance fir board ) 是由 毛克升 于 2019-10-25 设计创作，主要内容包括：本发明公开了一种高耐候性杉木板材的制备方法,属于木材防老化处理技术领域。所述高耐候性杉木板材的制备方法是先用2,4-二羟基二苯甲酮和纳米二氧化钛反应制备2,4-二羟基二苯甲酮接枝纳米二氧化钛,再用2,4-二羟基二苯甲酮接枝纳米二氧化钛和抗氧化剂的混合分散液对杉木板材进行一次改性处理,最后用聚氨酯水溶液对杉木板材进行二次改性处理。本发明制备的杉木板材不仅具有优异的耐候性,而且具有较好的耐磨性和尺寸稳定性,具有显著的经济价值和社会效益。(The invention discloses a preparation method of a high-weather-resistance fir board, and belongs to the technical field of anti-aging treatment of wood. The preparation method of the high weather resistance fir wood board comprises the steps of firstly preparing 2, 4-dihydroxy benzophenone grafted nano titanium dioxide by reacting 2, 4-dihydroxy benzophenone with the nano titanium dioxide, then carrying out primary modification treatment on the fir wood board by using a mixed dispersion liquid of the 2, 4-dihydroxy benzophenone grafted nano titanium dioxide and an antioxidant, and finally carrying out secondary modification treatment on the fir wood board by using a polyurethane aqueous solution. The fir board prepared by the invention not only has excellent weather resistance, but also has better wear resistance and dimensional stability, and has remarkable economic value and social benefit.)

1. A preparation method of a high weather resistance fir board is characterized by comprising the following steps: firstly, 2, 4-dihydroxy benzophenone and nano titanium dioxide are reacted to prepare 2, 4-dihydroxy benzophenone grafted nano titanium dioxide, then the mixed dispersion liquid of the 2, 4-dihydroxy benzophenone grafted nano titanium dioxide and an antioxidant is used for carrying out primary modification treatment on the cedar plate, and finally polyurethane aqueous solution is used for carrying out secondary modification treatment on the cedar plate; the method specifically comprises the following steps:

(1) adding 2-8 g of gamma- (2, 3-epoxypropoxy) propyl trimethoxy silane modified nano titanium dioxide into 100-400 mL of N, N-dimethylformamide, performing ultrasonic treatment for 30-60 min, introducing nitrogen, heating to 40-80 ℃, sequentially adding 0.05-0.4 g of catalyst and 0.5-1 g of 2, 4-dihydroxy benzophenone under magnetic stirring, and continuing to perform magnetic stirring reaction for 4-8 h; after the reaction is finished, performing centrifugal separation, fully washing the separated solid matter with 100-400 mL of N, N-dimethylformamide, and performing vacuum drying at 40 ℃ for 24h to prepare 2, 4-dihydroxy benzophenone grafted nano titanium dioxide;

(2) adding 20-60 g of 2, 4-dihydroxy benzophenone grafted nano titanium dioxide, 10-20 g of antioxidant, 2-8 g of dispersant and 1-10 g of defoamer into 1000-2000 mL of water, mechanically stirring for 60-120 min at room temperature, then carrying out ultrasonic treatment for 60-120 min, and finally mechanically stirring for 30-60 min to prepare a mixed dispersion liquid of the 2, 4-dihydroxy benzophenone grafted nano titanium dioxide and the antioxidant;

(3) placing a fir board sample in an automatic vacuum pressurization tank, vacuumizing until the vacuum degree is 0.05-0.09 MPa, maintaining the pressure for 30-60 min, injecting the mixed dispersion liquid, pressurizing to 1-1.5 MPa, maintaining the pressure for 1-2 h, and releasing the pressure; continuously impregnating for 4-6 h under normal pressure, taking out a fir board sample, removing redundant residual liquid on the surface, and drying for 48h at 40 ℃ to obtain a primary modified fir board sample;

(4) placing a sample of the primarily modified fir board in an automatic vacuum pressurization tank, vacuumizing until the vacuum degree is 0.04-0.08 MPa, maintaining the pressure for 30-60 min, injecting 10-20 wt% of polyurethane aqueous solution, pressurizing to 1-2 MPa, maintaining the pressure for 30-60 min, and releasing the pressure; and continuously impregnating for 3-6 h under normal pressure, taking out a fir board sample, removing redundant residual liquid on the surface, and drying for 48h at 40 ℃ to obtain a secondary modified fir board sample, namely the high-weather-resistance fir board.

2. The method for preparing a fir wood board with high weather resistance as claimed in claim 1, wherein: the catalyst is any one of ethylenediamine, m-phenylenediamine and 2-methylimidazole.

3. The method for preparing a fir wood board with high weather resistance as claimed in claim 1, wherein: the antioxidant is any one of antioxidant 1010, antioxidant 2246, antioxidant 264 and antioxidant 168.

4. The method for preparing a fir wood board with high weather resistance as claimed in claim 1, wherein: the dispersing agent is any one of sodium polyacrylate and didecyl dimethyl ammonium chloride.

5. The method for preparing a fir wood board with high weather resistance as claimed in claim 1, wherein: the defoaming agent is any one of polydimethylsiloxane, polyoxyethylene polyoxypropylene amine ether, polyoxypropylene ethylene oxide glycerol ether, a defoaming agent DF7010 and a defoaming agent DF 681F.

Technical Field

The invention belongs to the technical field of anti-aging treatment of wood, and particularly relates to a preparation method of a high-weather-resistance fir board.

Background

China fir is the main fast growing wood in south China, and has the advantages of fast growth, straight dry shape, easy processing, special fragrance and the like. In addition, the fir has rich resources and moderate price, so the fir is widely applied to the fields of furniture, interior decoration and the like, such as floors, luxury wooden door frames, core strips of core boards and the like. However, the fir wood board is easily discolored due to the action of thermal oxygen and ultraviolet light during a long time use, resulting in a deteriorated appearance. In order to improve the aging resistance of the fir, the dunshao (dunshao, great forest, forest posture, great wall of great city; the influence of accelerated aging on the performance of the artificial fir wood in high-temperature heat treatment, proceedings of the institute of building and welfare, 2014, 34 (1): 77-81) is used for carrying out heat treatment on the fir in a nitrogen atmosphere, and the influence of the heat treatment temperature and time on the aging resistance of the fir is researched. It was found that the color difference was reduced during accelerated aging of heat-treated fir wood, but the mechanical properties were severely reduced, compared to non-heat-treated fir wood.

Disclosure of Invention

The invention provides a preparation method of a high-weather-resistance fir board, aiming at the problem that the fir board is easy to discolor in the long-time use process. The fir board prepared by the invention not only has excellent weather resistance, but also has better wear resistance and dimensional stability, and has remarkable economic value and social benefit.

In order to achieve the purpose, the invention adopts the following technical scheme:

a method for preparing a high-weather-resistance fir wood plate comprises the steps of firstly preparing 2, 4-dihydroxy benzophenone grafted nano titanium dioxide by reacting 2, 4-dihydroxy benzophenone with nano titanium dioxide, then carrying out primary modification treatment on the fir wood plate by using a mixed dispersion liquid of the 2, 4-dihydroxy benzophenone grafted nano titanium dioxide and an antioxidant, and finally carrying out secondary modification treatment on the fir wood plate by using a polyurethane aqueous solution.

The preparation method of the high weather resistance fir board specifically comprises the following steps:

(1) adding 2-8 g of gamma- (2, 3-epoxypropoxy) propyl trimethoxy silane modified nano titanium dioxide (wiyi, chenopodium, suviet, dayan, xuzhonghao; KH560 modified nano titanium dioxide has influence on the performance of an epoxy coating, material science and technology, 2014, (6) 101-; after the reaction is finished, performing centrifugal separation, fully washing the separated solid substance with 100-400 mLN, N-dimethylformamide, and performing vacuum drying at 40 ℃ for 24 hours to prepare 2, 4-dihydroxy benzophenone grafted nano titanium dioxide;

(2) adding 20-60 g of 2, 4-dihydroxy benzophenone grafted nano titanium dioxide, 10-20 g of antioxidant, 2-8 g of dispersant and 1-10 g of defoamer into 1000-2000 mL of water, mechanically stirring for 60-120 min at room temperature, then carrying out ultrasonic treatment for 60-120 min, and finally mechanically stirring for 30-60 min to prepare a mixed dispersion liquid of the 2, 4-dihydroxy benzophenone grafted nano titanium dioxide and the antioxidant;

(3) placing a fir board sample in an automatic vacuum pressurization tank, vacuumizing until the vacuum degree is 0.05-0.09 MPa, maintaining the pressure for 30-60 min, injecting the mixed dispersion liquid, pressurizing to 1-1.5 MPa, maintaining the pressure for 1-2 h, and releasing the pressure; continuously impregnating for 4-6 h under normal pressure, taking out a fir board sample, removing redundant residual liquid on the surface, and drying for 48h at 40 ℃ to obtain a primary modified fir board sample;

(4) placing a sample of the primarily modified fir board in an automatic vacuum pressurization tank, vacuumizing until the vacuum degree is 0.04-0.08 MPa, maintaining the pressure for 30-60 min, injecting 10-20 wt% of polyurethane aqueous solution, pressurizing to 1-2 MPa, maintaining the pressure for 30-60 min, and releasing the pressure; and continuously impregnating for 3-6 h under normal pressure, taking out a fir board sample, removing redundant residual liquid on the surface, and drying for 48h at 40 ℃ to obtain a secondary modified fir board sample, namely the high-weather-resistance fir board.

The catalyst is any one of ethylenediamine, m-phenylenediamine and 2-methylimidazole.

The antioxidant is any one of antioxidant 1010, antioxidant 2246, antioxidant 264 and antioxidant 168.

The dispersing agent is any one of sodium polyacrylate and didecyl dimethyl ammonium chloride.

The defoaming agent is any one of polydimethylsiloxane, polyoxyethylene polyoxypropylene amine ether, polyoxypropylene ethylene oxide glycerol ether, a defoaming agent DF7010 and a defoaming agent DF 681F.

The invention has the following remarkable advantages:

(1) according to the invention, the ultraviolet absorbent 2, 4-dihydroxy benzophenone is grafted to the surface of the nano titanium dioxide, so that the dispersibility of the nano titanium dioxide can be improved, the nano titanium dioxide is effectively prevented from agglomerating, the using amount of the nano titanium dioxide is reduced, and the compatibility of the nano titanium dioxide and the surface of the cedar can be improved.

(2) The polyurethane has excellent wear resistance, and can form a protective layer on the surface and in gaps of the fir wood by soaking the polyurethane in the fir wood, so that the loss of the 2, 4-dihydroxy benzophenone grafted nano titanium dioxide and the antioxidant can be effectively prevented, and the fir wood board can be endowed with excellent waterproofness, wear resistance and dimensional stability.

(3) Because the 2, 4-dihydroxy benzophenone and the nano titanium dioxide can endow the cedar board with excellent light aging resistance, the antioxidant can endow the cedar board with excellent heat and oxygen aging resistance, and the nano titanium dioxide and the polyurethane can endow the cedar board with better wear resistance and dimensional stability, the cedar board with excellent weather resistance, better wear resistance and dimensional stability can be prepared by treating the cedar board by grafting the 2, 4-dihydroxy benzophenone, the antioxidant and the polyurethane.

(4) The fir board prepared by the invention has excellent weather resistance, and better wear resistance and dimensional stability, the AE value and the bending strength of the fir before treatment are respectively 0, 7.4, 12, 14, 15, 61MPa, 56MPa, 49MPa, 41MPa and 35MPa at 0d, 1d, 3d, 5d and 7d, the delta E value and the bending strength of the fir after treatment are respectively 0, 2.9-4.1, 3.6-5.4, 4.4-7.1, 4.9-7.6, 76-94 MPa, 72-90 MPa, 66-84 MPa, 61-80 MPa and 57-76 MPa at 0d, 1d, 3d, 5d and 7d, the abrasion value is 0.40-0.68 g/100r, and the total dry shrinkage rate is 4.6-6.1%, and the fir board has obvious economic value and social benefit.

Detailed Description

The advantages and effects of the method for producing highly weather-resistant fir-wood panels according to this embodiment will be further illustrated by the following examples and comparative examples. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.