DPnB封端改性聚氨酯水分散体及助成膜性能  

Modification and Film-Forming Performance of DPn B Blocked Aqueous Polyurethane Dispersions

作　　者：徐雪[1] 钟尚富 朱延安 瞿金清[1] 

机构地区：[1]华南理工大学化学与化工学院,广东广州510640 [2]嘉宝莉化工集团股份公司,广东江门529085

出　　处：《高校化学工程学报》2016年第4期905-910,共6页Journal of Chemical Engineering of Chinese Universities

基　　金：广东省自然科学基金(2015A030313205);广东省省级科技计划项目(2015A010105010);广东省省部产学研结合重大专项(2015B090925006;2014B090903010和2012A090300004)

摘　　要：降低水性木器涂料中挥发性有机化合物(VOC)含量一直是研究的热点和难点,本文采用一元醇对聚氨酯预聚体封端改性,制备聚氨酯水分散体(b-PUD),探讨了封端剂种类、NCO封端度、NCO/OH摩尔比及软段聚多元醇种类等对b-PUD助成膜性能的影响。发现二丙二醇丁醚(DPn B)封端改性b-PUD的助成膜能力最好,且随封端度增加助成膜能力增强;聚醚二元醇为软段合成的b-PUD助成膜能力较聚酯二元醇好,以聚醚N210最好。当封端度80%,NCO/OH摩尔比1.5,制备b-PUD添加量为25%时,复配乳液的最低成膜温度(MFT)为2.9℃;该b-PUD制备水性透明底漆的VOC含量低至28 g?L?1,其涂膜具有优异的打磨性和高透明度。Reducing volatile organic compounds （VOC） contents in waterborne wood coatings is challenging. Modified aqueous polyurethane dispersion （b-PUD） was prepared by blocking polyurethane prepolymer with monohydric alcohol. The effects of blocking agent category, NCO blocked percentage, NCO/OH molar ratio and soft segment polyol type on assistant-film-forming performance ofb-PUD were discussed. The results show that b-PUD modified by dipropylene glycol butyl ether （DPnB） has the best assistant-film-forming ability which increases with the increase of blocked percentage. In addition, the assistant-film-forming ability of b-PUD with polyether glycol as the soft segment is better than that of polyester glycol, and polyether N210 shows the best performance. When NCO blocked percentage is 80%, molar ratio of NCO/OH is 1.5 and b-PUD adding percentage is 25%, the minimum film forming temperature （MFT） of the composite emulsion is 2.9℃ and the VOC content of the waterborne transparent primer based on b-PUD is 28 g.L^-1. This coating has excellent sanding property and high transparency.

关 键 词：聚合反应 封端改性 水性聚氨酯分散体 助成膜性能 合成 黏度 

分 类 号：TQ630.4[化学工程—精细化工]