Preparation method of modified polyvinyl alcohol/thermoplastic resin composite material
A technology of polyvinyl alcohol resin and thermoplastic resin, which is applied in the field of materials and can solve problems such as poor strength and poor water resistance
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[0025] In an embodiment of the present invention, a method for preparing a modified polyvinyl alcohol / thermoplastic resin composite material comprises the following steps:
[0026] By weight, add 10-80 parts of polyvinyl alcohol resin into 100-800 parts of dimethyl sulfoxide, place it in a constant temperature water bath at 45-55°C, stir evenly, and dissolve to obtain a polyvinyl alcohol resin solution, which is added dropwise. 1-10 parts of concentrated sulfuric acid, add 1-70 parts of fatty alcohol, react for 1-4 hours, then filter under reduced pressure, pour the filtrate into 400-800 parts of acetone, let stand, the product is precipitated, washed, filtered, and dried to constant weight , to obtain etherified polyvinyl alcohol resin;
[0027] In parts by weight, add 10-80 parts of etherified polyvinyl alcohol resin into 100-800 parts of deionized water to dissolve or swell for 2-5 hours, at a constant temperature of 90-95 ℃, add 1-10 parts of concentrated sulfuric acid dro...
Embodiment 1
[0057] In parts by weight, 50 parts of PVA1788 were added to 400 parts of dimethyl sulfoxide, stirred in a constant temperature water bath at 50°C, and dissolved to obtain a polyvinyl alcohol resin solution, 2 parts of concentrated sulfuric acid was added dropwise, 30 parts of n-butanol were added, and the reaction was carried out for 3 hours. . Filtration under reduced pressure, pouring the filtrate into 400 parts of acetone, standing, the product was precipitated, washed, filtered, dried to constant weight, and the polyvinyl alcohol resin was etherified.
[0058] In parts by weight, 50 parts of etherified polyvinyl alcohol resin was added to 500 parts of deionized water to swell for 3 hours. At a constant temperature of 92 °C, 1 part of concentrated sulfuric acid was added dropwise, and 30 parts of 1H, 1H, 2H, 2H-perfluorodecyltrimethyl were added. Oxysilane was stirred for 4 hours under nitrogen, filtered under reduced pressure, the filtrate was poured into 400 parts of abs...
Embodiment 2
[0063] In parts by weight, 50 parts of PVA1788 were added to 400 parts of dimethyl sulfoxide, stirred in a constant temperature water bath at 50°C, and dissolved to obtain a polyvinyl alcohol resin solution, 2 parts of concentrated sulfuric acid was added dropwise, 30 parts of n-butanol were added, and the reaction was carried out for 3 hours. . Filtration under reduced pressure, pouring the filtrate into 400 parts of acetone, standing, the product was precipitated, washed, filtered, and dried to constant weight to obtain etherified polyvinyl alcohol resin.
[0064] In parts by weight, 50 parts of etherified polyvinyl alcohol resin was added to 500 parts of deionized water to swell for 3 hours, and at a constant temperature of 92 °C, 1 part of concentrated sulfuric acid was added dropwise, 30 parts of 3-isocyanatopropyltrimethoxysilane was added, and nitrogen was purged. The reaction was stirred for 4h. Filtration under reduced pressure, pouring the filtrate into 400 parts of...
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