An insect-proof and mildew-proof wood-plastic composite material and its preparation method
A wood-plastic composite material and anti-mildew technology, applied in the field of wood-plastic composite materials, can solve problems such as moths and molds that are prone to occur
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[0028] The preparation method of described modified wood flour comprises the steps:
[0029] After the wood powder is soaked and sterilized in a sodium hypochlorite solution, it is dried to obtain the pretreated wood powder;
[0030] The pretreated wood powder is dispersed in a calcium hydroxide solution, and carbon dioxide is introduced to carry out in-situ modification, and then dried to obtain the modified wood powder.
[0031] In the present invention, in parts by weight, the raw materials for the preparation of the insect-proof and mildew-proof wood-plastic composite material include 100 parts of polyvinyl chloride. In the present invention, the polyvinyl chloride, as the matrix of the insect-proof and mildew-proof wood-plastic composite material, has the advantage of being cheap and easy to obtain, and reduces the cost of the insect-proof and mildew-proof wood-plastic composite material as a whole.
[0032] In the present invention, based on the weight of polyvinyl chlo...
Embodiment 1
[0058] 30g wood powder (particle size 100~300 μ n) is soaked and sterilized in the sodium hypochlorite solution of 5wt.% concentration for 2 hours, and then dried to obtain pretreated wood powder; the pretreated wood powder is dispersed in 0.5wt.% Add carbon dioxide to the calcium hydroxide solution, modify at 25°C for 60 minutes, and then dry to obtain modified wood powder;
[0059] Disperse 25g of nano-calcium carbonate (particle size 50-100nm), 30g of modified wood flour, and 8g of γ-aminopropyltriethoxysilane in 200g of ethanol, stir at 70°C for 15h, then filter and dry in sequence to obtain the pre- mix;
[0060] The premix was mixed with 100g of polyvinyl chloride, 5g of zinc borate, 15g of polyethylene wax and 10g of triphenyl phosphite, then kneaded at 150°C for 10min, then poured into a mold, and held at a pressure of 30MPa for 3min. An insect-proof and mildew-proof wood-plastic composite material is obtained.
Embodiment 2
[0062] 50g of wood powder (100-300 μm in particle size) was soaked and disinfected in a sodium hypochlorite solution with a concentration of 8wt.% for 2 hours, and then dried to obtain pretreated wood powder; the pretreated wood powder was dispersed in a concentration of 0.9wt.%. Add carbon dioxide to the calcium hydroxide solution, modify at 25°C for 60 minutes, and then dry to obtain modified wood powder;
[0063] Disperse 15g of nano-calcium carbonate (particle size 50-100nm), 50g of modified wood flour, and 7g of γ-aminopropyltriethoxysilane in 150g of ethanol, stir at 80°C for 10h, then filter and dry in sequence to obtain the pre- mix;
[0064] Mix the premixed material with 100g of polyvinyl chloride, 3g of magnesium borate, 8g of polyethylene wax and 8g of dibutyl phthalate, then knead at 140°C for 10min, then pour it into a mold, and keep the pressure at 15MPa 8 minutes to obtain the insect-proof and mildew-proof wood-plastic composite material.
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