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POLYURETHANE COMPOSITES COMPRISING NANOCRYSTALLINE CELLULOSE AND METHOD FOR IMPROVING PROPERTIES OF POLYURETHANES THEREOF
POLYURETHANE COMPOSITES COMPRISING NANOCRYSTALLINE CELLULOSE AND METHOD FOR IMPROVING PROPERTIES OF POLYURETHANES THEREOF
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机译:包含纳米晶纤维素的聚氨酯复合材料及其改善其聚氨酯性能的方法
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摘要
A process for preparing polyurethane composites includes (i) providing a dispersion of nanocrystalline cellulose in (a) one or more polyols, (b) one or more isocyanates, or (c) one or more polyols and one or more isocyanate, mixed together; wherein the amount of water in the nanocrystalline cellulose is less than about 1% w/w; (ii) mixing the dispersion of (i)(a) with an isocyanate or (i)(b) with a polyol and a catalyst to allow polymerization; or mixing the dispersion of (i)(c) and a catalyst to allow polymerization; and (iii) isolating the polyurethane composite. A method for improving properties of polyurethanes includes dispersing nanocrystalline cellulose into one or both parts of a two part polyol/isocyanate precursors prior to allowing polymerization of the precursors, wherein the amount of water in the nanocrystalline cellulose is less than about 1% w/w; mixing the dispersion with a catalyst; and polymerizing the precursors to provide the polyurethane.
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机译:制备聚氨酯复合材料的方法包括(i)在(a)一种或多种多元醇,(b)一种或多种异氰酸酯,或(c)一个或多个多元醇和一个或多个异氰酸酯,混合在一起的纳米晶纤维素的分散体;其中纳米晶纤维素中的水量小于约1%w / w; (ii)将(i)(a)与异氰酸酯或(i)(b)的分散体与多元醇和催化剂混合以允许聚合;或混合(I)(c)和催化剂以允许聚合的分散体; (iii)分离聚氨酯复合材料。改善聚氨酯性质的方法包括将纳米晶纤维素分散到两部分多元醇/异氰酸酯前体的一种或两种部分,以允许前体的聚合,其中纳米晶纤维素中的水量小于约1%w / w ;将分散体与催化剂混合;并聚合前体以提供聚氨酯。
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