乙酰丙酮钛螯合物掺杂丙烯酸酯共聚物水溶胶  

Acrylate Copolymer Hydrosol Modified by Acetylacetone Chelate of Isopropoxy Titanium

作　　者：黄志虹[1] 严芳[1] 张黎明[1] 钟俊文 

机构地区：[1]中山大学化学与化学工程学院高分子研究所,广州510275 [2]珠海乐通化工制造有限公司

出　　处：《应用化学》2005年第4期422-426,共5页Chinese Journal of Applied Chemistry

基　　金：珠海市科委基金资助项目(PC200310031)

摘　　要：用乙酰丙酮螯合二异丙氧化钛掺杂改性三元羧基丙烯酸酯共聚物(MBA)和2个增加了羟基、羟胺基的四元共聚物(MBAH)和(MBAN)。加入螯合物后,共聚物水溶胶的粘度提高,平均粒径增大,表面张力下降。涂膜的热分解活化能、耐水性提高,并且具有较好的复溶性,共聚物Tg增加了10℃。掺杂后MBA水溶胶的平均粒径从70nm增至123nm,表面张力下降到25 20mN/m,热分解活化能达138 3kJ/mol。四元共聚物MBAN的耐水性得到明显提高,涂膜吸水率仅为1 4%,可适用于水性油墨。掺杂螯合物的3个水溶胶加热后均在230nm处出现了新的UV吸收峰,MBAN新吸收峰所对应的温度最低(60℃)。DSC结果表明,螯合物与共聚物MBA发生放热反应。Acetylacetone chelate of isopropoxy titanium was used to modify a ternary carboxy copolymer(MBA) and two tetracopolymers with additional hydroxyl and hydroxylamine groups(MBAH and MBAN). The addition of the chelate increased both the hydrosol viscosity and average particle size, and decreased the hydrosol surface tension; the T_g of the film and the activation energy for the thermal decomposition were (higher), and the water resistance of the film was improved. The chelate brought the biggest change for MBA (hydrosol) in average particle size, which increased from 70 nm to 123 nm, and its surface tension decreaced to 25.20 mN/m, and the decomposition activation energy reached 138.3 kJ/mol. The water resistance of MBAN was improved saliently, with a water up-take of less than 1.5%. Thus it is suitable for use as water-based ink. All the three heated hydrosols with the chelate showed a new absorption peak in UV analysis, indicating that a new product was formed in the heating course. DSC results (also) show that there was an exothermic (reaction) in heating the chelate/MBA blend.

关 键 词：乙酰丙酮钛螯合物 丙烯酸酯共聚物水溶胶 掺杂 

分 类 号：O632.5[理学—高分子化学]