化工进展

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羟基丙烯酸树脂包覆HDI缩二脲胶粒的成膜过程及其影响因素

周新华1,肖文清1,崔英德1,涂伟萍2   

  1. 1 仲恺农业工程学院化学化工学院,广东 广州 510225;2 华南理工大学化工所,广东 广州 510640
  • 出版日期:2010-10-05 发布日期:2010-10-05

Film formation and effective factors of HDI biuret particles coated with hydroxyl polyacrylic resin

ZHOU Xinhua1,XIAO Wenqing1,CUI Yingde1,TU Weiping2   

  1. 1 Chemistry and Chemical Engineering College,Zhongkai University of Agriculture and Engineering,Guangzhou 510225,Guangdong,China;2 Research Institute of Chemical Engineering,South China University of Technology,Guangzhou 510640,Guangdong,China
  • Online:2010-10-05 Published:2010-10-05

摘要:

采用相反转法制备了羟基丙烯酸树脂包覆HDI缩二脲乳液,通过FTIR和涂膜溶剂浸泡保留率跟踪了包覆粒子的成膜过程,考察了混合工艺、羟基单体种类、催化剂等因素对涂膜交联的影响。结果表明,成膜过程中,—OH—NCO交联生成氨基甲酸酯,—NCO同时与H2O反应生成的CO2扩散出涂膜,没有形成涂膜缺陷。成膜温度越高,涂膜交联度在成膜前期越高,而在成膜后期,涂膜交联度反而越低。HDI缩二脲在羟基丙烯酸溶液中分散越均匀,羟基丙烯酸树脂中羟基反应活性越高,催化剂用量越多,涂膜交联度越大。

Abstract:

HDI biuret particles coated with hydroxyl polyacrylic resin were prepared by using phase inversion technique. The film formation process of the coated particles was tracked by FTIR and the coating retention rate soaked in solvent. Effect of mixing technologyhydroxyl monomers and catalyst on the crosslinking degree of coating was investigated. During the film formation processurethane crosslinking is formed by reaction between OH and NCO. NCO also reacts with H2O and the produced CO2 can escape from the coating film without forming film defects. As the increase in film formation temperaturethe higher cross-linking degree of the coating at earlier stagethe lower crosslinking degree of the coating at later stage. The crosslinking degree of film can be increased by improving the dispersion of HDI biuret in hydroxyl polyacrylic resin and HDI biuret due to the increased hydroxyl reactivity of polyacrylic resin. The crosslinking degree of film can also be increased by the increase in catalyst content.

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