
工艺技术
第42卷第3期 2012年3月
涂料工业
PAINT&COATINGS INDUSTRY
基点击反应制备双重固化的水性混杂涂料付长清2,陈樟,刘海波,陈义旺,中亮(1,南昌大学高分子研完所,
南昌330031;2.江西科技师范学院江西省有机功能分子重点实验室,南昌330013)
Vol.42No.3 Mar.2012
摘要:通过可逆加成-断裂链转移自由基(RAFT)乳液聚合的方法合成了一系列具有不同烯丙基/环氧基物质的量比的水性混杂乳液,将此混杂乳液与基封端的聚氢酯水分散体复合可制得含烯丙基/环氧基/殖基三种活性基团的水性混杂涂料,采用傅里叶红外光谱(FT-IR)对RAFT乳液和固化膜的结构及混杂涂料的固化过程进行研究,并研究了固化膜的性能。研究表明可通过RAFT乳波聚合制得具有预想结构的聚合物乳液,不同的固化条件对固化膜的性能有很大影响,在光/热双重固化的条件下,通过殖基点击反应制备的途膜铅笔硬度为6日,耐甲乙酮的擦拭次数为1000次,凝胶量为83.96%,耐冲击性>50cm
关键词:混杂:RAFT乳液聚合:疏基点击反应:双重固化
中图分类号:TQ637.81
文献标识码:A
文章编号:0253-4312(2012)03-0020-04
Preparation of Waterborne Dual Curing Hybrid
Coating via Thiol Based Click Reaction
Fu Changqing'?, Chen Zhang', Liu Haibo', Chen Yiwang', Shen Liang
(1. Institate of Polymers, Nanchang Uniersity, Nanchang 330031,China;
2. Jiangxi Key Laboralory of Organic Chemistry, Jiangxi Science & Technology Normal Unieersity, Nanchang 330013,China)
Abstract: A series of waterborme hybrid emulsion with different mole ratio of allyl/epoxy were prepared through the reversible addition - fragmentation chain transfer radical ( RAFT) emulsion polymerization, which were then blended with thiol terminated water based polyurethane dispersion to obtain the waterborne hybrids coatings which containing allyl/epoxy/thiol three active groups. The structures of the emulsions and cured films and the curing process of hybrid coatings were characterized by FT -IR, at the same time, the properties of cured films were studied. The results showed that the emulsions with expected structure could be prepared through the RAFT emulsion polymerization, and the properties of cured films varied with differ-ent curing condition.Under UV/thermo dual curing conditions,the gel content of eured films was 83.96%. the solvent -resistance(MEK) was 1 O00 time, pencil hardness 6H, and impact strength was greater than 50cm.
Key Words : hybrid; RAFT emulsion polymerization; thiol based click reaction; dual curing
水性UV固化涂料具有环境友好、不易燃、易于调节黏度和流变性、易附着的优点,但由于水性光固化涂料在水性化的过程中会引人一些水性化官能团,这些官能团的引人会降低涂料的耐水性、耐溶剂性与机械性能。采用环氧和丙烯酸酯类双键杂化或紫外光固化和热固化联用的方法来提高涂层的交联密度可为解决这一问题提供思路(2-3)。在这些改性方法中,参与紫外光固化的官能团仍以丙烯酸酯类双键为主,丙烯酸酯类双键在光固化过程存在受氧阻聚明显和固化时体程收缩等不足,面殖基参与的光聚合反应对水与氧均不敏感,体
积收缩率小,反应效率高-9],因殖基在紫外光照射下可与碳碳双键进行光聚合反应、在受热及催化剂的催化下可与环氧基发生高效点击反应9),所以很适合做环氧和烯类单体的杂化及双重固化研究。目前对殖基/锈和筑基/环氧基的双重固化体系的研究仅限于溶剂型体系(-),对其在水性体系中的固化过程及固化膜性能的研究较少
可逆加成-断裂链转移自由基(RAFT)聚合方法可用来制备结构明断、可控的聚合物
,本研究以甲基丙烯酸烯内
酯和甲基丙烯酸缩水甘油酯为单体,通过RAFT乳液聚合的方
【基金项局】国家自然科学基金项路(51063002)、江西有教育厅青年科学基金项目(GJJ09575)
作者简会:付长清(1980一),女,在读博士,研究方向为水性光国化涂料 20