化工学报 ›› 2005, Vol. 56 ›› Issue (1): 168-173.

• 材料科学与工程 • 上一篇    下一篇

蓖麻油聚氨酯-丙烯酸酯复合乳液的合成

瞿金清;沈慧芳;陈焕钦   

  1. 华南理工大学化学工程研究所,广东 广州 510640
  • 出版日期:2005-01-25 发布日期:2005-01-25

Synthesis of castor oil water-borne polyurethane-acrylate hybrid emulsions

QU Jinqing;SHEN Huifang;CHEN Huanqin   

  • Online:2005-01-25 Published:2005-01-25

摘要: 采用甲基丙烯酸甲酯(MMA)与蓖麻油水性聚氨酯乳液共聚反应制备聚氨酯丙烯酸酯(PUA)复合乳液,研究了蓖麻油水性聚氨酯性能、MMA添加量、引发剂种类和聚合温度对PUA复合乳液及涂膜性能的影响,并应用傅里叶红外光谱(FTIR)测定反应产物的结构.研究发现,用外观半透明或微透明的PU-M分散液制备的PUA乳液及涂膜性能优良.油溶性引发剂(AIBN)比水溶性引发剂(K2S2O8)更适合本体系的乳液聚合.随着MMA含量增大,PUA复合乳液胶粒粒径增大,黏度减小,涂膜光泽度下降,机械性能变好,耐水性增加.合适的MMA含量为体系总固含量的20%~30%.提出了PUA复合乳液胶粒形成及粒径长大机理.

关键词: 聚氨酯丙烯酸酯, 复合乳液, 合成, 蓖麻油

Abstract: The castor oil polyurethane-acrylate hybrid emulsion (PUA) was prepared by the emulsion co-polymerization of castor oil polyurethane dispersion and methyl methacrylate (MMA). The effects of castor oil polyurethane dispersion, MMA content, the initiator and polymerization temperature on the properties of PUA emulsion and its film were investigated. The structure of PUA was characterized by Fourier transform infrared (FTIR). It was found that the PUA emulsion with excellent properties could be obtained by using PU dispersion with opalescent or translucent appearance, and the oil-soluble initiator (AIBN) was better than water-soluble initiator (K2S2O8) in the polymerization system.The mechaniscal properties and water resistance of PUA coating film were improved, while the average particle size, viscosity of PUA emulsions and PUA film gloss decreased as with increasing MMA content.The optimal MMA content was determined as 20%—30% of the total solid content of PUA emulsion.The mechanisms of particle formation and particle size growth of PUA emulsion polymerization were proposed.

Key words: 聚氨酯丙烯酸酯, 复合乳液, 合成, 蓖麻油