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简介了中国“九.5”涂料科技攻关的部分成果,分析了与工业发达国家的主要差距,展望了低污染、高性能水性汽车涂料系列;水相法氯化聚烯烃及其涂料;低VOC环保型水性PU涂料;无溶剂聚脲聚氨酯;纳米材料及其在涂料中的应用;水性铁路车辆漆系列;无毒防污涂料系列;氟树脂及其涂料以及PU涂料系列固化剂等9个领域的发展趋势。 相似文献
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在借鉴国外水性涂料性能标准的基础上,分析了轨道车辆用水性涂料体系的选型、检测标准和施工工艺;结合水性涂料应用经验,论述了施工过程存在的问题和解决方案。 相似文献
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Novel self-crosslinkable graft copolymers with complementary reactive groups, that is, a pendant blocked isocyanate in the first segment and a hydroxyl group in the second segment, were developed. In order to incorporate isocyanate functionality, m-isopenyl-,-dimethyl benzyl isocyanate (TMI) was (copolymerized with n-butyl acrylate (nBA) by radical polymerization in solution. Subsequently, a part of the isocyanate was reacted with 2-hydroxyethyl acrylate (HEA) in order to incorporate a polymerizable double bond into the copolymer molecule. After blocking the remaining isocyanate groups with methyl ethyl ketone (MEK) oxime, the polymerizable prepolymer was copolymerized with methacrylates, including hydroxyl monomers, to form the graft copolymer. Another process of preparing the graft polymer was also carried out; TMI/nBA copolymer was reacted with MEK oxime to block about 70% of isocyanate groups, then poly(ol)polymer such as poly(ester)resin was added. After the grafting reaction was completed, remaining NCOs were blocked by MEK oxime. Furthermore, by incorporating neutralizable functionalities such as carboxyl or tertiary amino groups to the second segment of the graft copolymer, self-dispersible (self-stabilized) aqueous coating vehicles were prepared. MEK oxime blocked tertiary isocyanate from TMI in the present graft polymers exhibits fairly lower deblocking temperature comparing to the similar products derived from IBM (isocyanatoethyl methacrylate) or isophorone diisocyanate-hydroxyethyl acrylate (IPDI-HEA) adduct, and hence it is possible to produce coatings curable at a lower temperature (100–120 °C) while retaining satisfactory storage stability. Owing to this curability the coatings are applicable to the products made of plastics such as components of automotives etc. Possible application to waterborne coatings is also described. 相似文献
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