第44卷第8期 2014年8月
涂料工业
PAINT & COATINCS INDUSTRY
TDI改性水性醇酸树脂的合成研究
Vol.44No.8 Aug.2014
杨涛，夏正斌，雷亮，林晓琼（华南理工大学化学与化工学院，广州510640）
摘要：先以亚麻油（L.O.）、三羟甲基丙烷（TMP）、邻苯二甲酸酐（PA)为主要原料，采用醇解法合成了端羟基醇酸树脂预聚物再与甲苯二异氰酸酯（TDI）、二羟甲基丙酸（DMPA）等原料反应合成了TDI改性的水性醇酸树脂分散体（WAR）。探讨了醇酸树脂预聚物的油度、酸值、DMPA含量、R值[n(一NCO)/n（一OH)]等因素对分散体的外观、黏度、粒径及涂膜的硬度、柔韧性、光泽等性能的影响。采用傅里叶变换红外光谱仪（FT-IR)表征了产物的结构。采用热重分析（TG）研究了R值对涂膜耐热性的影响。研究结果表明：当水性醇酸树脂的油度为40%~45%，酸值为7~10mgK0H/g DMPA含量为7%，R值为1.4时，所得涂膜的硬度、光泽、稳定性等性能最佳。
关键调：水性醇酸树脂；甲苯二异氰酸酯；二羟甲基丙酸：耐热性
中图分类号：TQ630.4*3
文献标识码：A
文章编号：0253-4312(2014)08-0029-07
SynthesisofTDIModifiedWaterborneAikvdResin
Yang Tao,Xia Zhengbin,Lei Liang,Lin Xiaoqiong
(School of Chemistryand Chemical Engineering,South China University
of Technology,Guangdong 510640,China)
Abstract: A terminal hydroxyl alkyd resin prepolymer was firstly synthesized by using lin-seed oil,trimethylolpropane (TMP) and phthalic anhydride (PA), and then reacted with tol uene diisocyanate （TDI),dimethylol propionic acid （DMPA) to obtaina TDI modified water borne alkyd resin dispersion (WAR). The influences of the oil length and the acid value of al kyd resin prepolymer,DMPA content,n(-NCO)/n(—OH)on the appearance,viscosity, and particle size of dispersion, meanwhile the hardness, flexibility and gloss properties of the film were discussed. The structure of the product was characterized by the Fourier infrared spectrometer (FT-IR).Effects of n(—NCO)/n(—OH) on the heat resistance of the film was studied by thermogravimetric analysis (TG). The results showed that when the oil length,acid value，DMPAcontent，n(-—NCO)/n(—OH)were40%~45%.7~10mgKOH/g，7%and 1.4 respectively,the resin gave excellent hardness, gloss and stability.
Key Words: waterborne alkyd resin; -toluene diisocyanate; dimethylol propionic acid; heatresistance
醇酸树脂是指在聚酯中引入脂肪酸侧链，即用脂肪酸改性的一种聚酯(1)。水性醇酸树脂以可再生的植*通信联系人
物油或脂肪酸为主要原料，并以水为溶剂，VOC含量低，进一步降低了使用有机溶剂对石油的消耗；其次，
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工艺技术