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.pdf

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2010年第29卷第10期
CHEMICAL INDUSTRY AND ENGINEERING PROGRESS
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研究开发
羟基丙烯酸树脂包覆HD缩二脲胶粒的成膜过程
及其影响因素
周新华,肖文清,崔英德,涂伟萍2
(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)
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FIR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吻。结果表明,成膜过程
中,-OH和ーNCO交联生成氯基甲酸醋,一NCO同时与H20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,凃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。HDT缩二脲在羟基丙烯酸
溶液中分散越均匀,羟基丙烯酸树脂中痊基反应活性越高,催化剂用量越多,涂膜交联度越大
关键词:丙烯酸树脂;包覆乳胶粒;HDI缩二脲;成膜
中图分类号:TQ43文献标志码:A
文章编号:1000-6613(2010)10-1939-04
Film formation and effective factors of HDI biuret particles coated with
hydroxyl polyacrylic resin
ZIOU Xinhua, XAO Wenging, CUI Yingde, TU Weiping
(Chemistry and Chemical Engineering College, Zhongkai University of Agriculture and Engineering
Guangzhou 510225, Guangdong, China; Research Institute of Chemical Engineering
South China University of Technology, Guangzhou 510640, Guangdong, China)
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 technology, hydroxyl monomers and catalyst
on the crosslinking degree of coating was investigated. During the film formation process, urethane
crosslinking is formed by reaction between OH and --NCO. -NCO also reacts with H,O and the
produced CO2 can escape from the coating film without forming film defects. As the increase in film
formation temperature, the higher cross-linking degree of the coating at earlier stage, the lower
crosslinking degree of the coating at later stage. The crosslinking degree of film can be increased b
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
Key words: polyacrylic resin; coated emulsion particle; HDI biuret; film formation
羟基丙烯酸树脂和多异氰酸酯混合后,干燥得
到的双组分聚氨酯性能优异,如低温交联、耐磨性
收稿日期:2010-05-24:修改稿日期:2010-06-12。
基金项目:广东省自然科学基金资助项目(8451022501000530)。
好、硬度高、柔韧性佳以及具有优异的耐化学品
第一作者简介:周新华(1974),男,副教授,研究方向为精细化
性和耐溶剂性等,广泛应用于汽车涂料、胶黏剂工。3-mailcexinhuazhou(163.com