树脂是涂料的主要成膜物质,但其降解十分缓慢。以原淀粉、异佛尔酮二异氰酸酯(IPDI)、聚乙二醇(PEG)和环氧树脂等为基本原料,制备一种自乳化型易降解淀粉基水性聚氨酯乳液及相应涂膜;对乳液进行红外光谱、粒径及分布和透射电镜表征,并对固化后涂膜的耐热性、耐腐蚀性、降解性及其基本性能进行分析测试。结果表明,成功引入了氨基甲酸酯键、醚键等所需基团;合成的淀粉基水性聚氨酯乳液粒径小,且分布均匀;涂膜表面微观平整光滑,成膜性好;淀粉基的引入,在较大程度上提高了水性聚氨酯涂膜的降解性能。
Resin is the main film-forming material of coatings,but it has slow degradation rate.The degradable starch-based waterborne polyurethane(WPU) emulsion and corresponding coatings were prepared by using raw starch,isophoronediisocyanate (IPDI),polyethylene glycol (PEG) and epoxy resin as the main raw materials.The chemical structure,particle size and distribution of the emulsion,transmission electron microscopy and the heat resistance,corrosion resistance,degradation and other basic performance of the corresponding coatings were characterized.The results showed that the groups such as carbamate bond and ether bond were successfully introduced.The starch-based WPU emulsion had small particle size and uniform distribution.The surface of the coating was not only smooth but it had good film-forming property.The degradation performance of the coatings was greatly improved by the introduction of starch.
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基金资助
四川省科技计划资助项目(2019JDTD0024,2019ZHCG0048);教育部春晖计划资助项目(Z2017066)
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