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利用饱和羟基硅烷为改性剂、钛酸丁酯为催化剂,以1,2–丙二醇与己二酸进行缩聚反应,制备了改性醇酸型聚酯树脂。研究了反应条件对反应转化率的影响,确定了适宜的合成工艺条件。当n(1,2–丙二醇)∶n(己二酸)=1.3∶1,硅醇、三(2-羟乙基)异氰尿酸酯(THEIC)和钛酸丁酯的用量分别为3%、5.6%和0.2%时,在200°C下缩聚反应5h,可得到无色透明的聚酯树脂,其转化率达到94.8%,黏度900mPa·s,表面张力(20°C下)27mN/m。树脂经固化后所得漆膜的附着力1级、冲击强度4.5MPa、硬度2H。
The modified alkyd-type polyester resin was prepared by polycondensation of 1,2-propanediol and adipic acid with saturated hydroxy silane as modifier and butyl titanate as catalyst. The influence of reaction conditions on the reaction conversion was studied, and the suitable synthesis conditions were determined. When n (1,2-propanediol): n (adipic acid) = 1.3:1, the amounts of silanol, tris (2-hydroxyethyl) isocyanurate (THEIC) and butyl titanate were 3 %, 5.6% and 0.2%, the polycondensation reaction at 200 ° C for 5h, a colorless and transparent polyester resin was obtained, the conversion rate reached 94.8%, viscosity 900mPa · s, surface tension (20 ° C) 27mN / m. The resin obtained after curing paint film adhesion level 1, impact strength 4.5MPa, hardness 2H.