马来酸酐改性超支化聚酯及其在紫外光固化涂层中的应用

以马来酸酐改性末端为羟基的超支化聚酯，得到链段中含大量不饱和双键的超支化马来酸酯,分析表征了不同改性度的超支化马来酸酯黏度、热稳定性及Tg的变化。以超支化马来酸酯为预聚物应用于紫外光固化涂层，考察了改性度对光固化膜附着力、冲击强度、柔韧性、硬度及耐溶剂性能的影响。实验表明，超支化马来酸酯是一种低黏度、热稳定性好、Tg易调节的高分子材料。当改性度为80%时，光固化涂层性能最佳，其光固化时间可达3s，膜附着力为1级，耐冲击强度为48kgf.cm，柔韧性>7cm，硬度达5H，同时具有优良的耐溶剂性能。

Maleic anhydride modified hyperbranched polyester and its application in UV-curable coating

The hyperbranched polyester with terminal hydroxyl groups was modified with maleic anhydride, and the hyperbranched maleate containing a great number of unsaturated double bonds in segmers was synthesized. The changes of viscosity, thermal stability and Tg on hyperbranched maleates with different modified degrees were analyzed and characterized. The hyperbranched maleates were used as prepolymer in UV-curable coating, and the effects of modified degrees on the adhesive strength, impact strength, flexibility, hardness and the solvent resistances of UV-curable coating were studied. The experiments indicated that the hyperbranched maleate was a kind of macromolecular material with low viscosity, good thermal stability and easy adjustable Tg. When the modified degree was 80%,the performances of the UV-curable coating were best, which the UV-curable time could reached 3s,the adhesive strength of coating was grade 1, impact strength was 48kgf.cm, the flexibility was above 7cm, the hardness reached 5H and it had the good solvent resistances.