Abstract:

Using trimethylolpropane triglycidyl ether (TMPGE) as a core molecule, star hydroxyl polyesters (SHPs) were synthesized via the ring-opening reaction of epoxy groups and carboxyl groups. The influence of the categories and molar ratios of raw materials on the properties of SHPs were investigated. The structures and molecular weights of SHPs were characterized with Fourier transform infrared spectrometer (FTIR), nuclear magnetic resonance (NMR) and gel permeation chromatography (GPC). The results showed that the SHPs prepared from oleic acid had the lowest viscosity. IR and ¹H NMR spectra indicated that the target SHPs were successfully prepared and possessed similar molecular skeleton structures. The GPC curves displyed that the measured molecular weights of SHPs approached to the theoretical values, and the polydispersity indexes (PDI) of SHPs were in the range of 1.10 to 1.28. The film properties of SHPs cured by the toluene diisocyanate adduct were tested and found that the cured films exhibited excellent adhesion, flexibility and high hardness. Especially, the solution viscosity of SHP-2 was less than 220 mPa·s at 80% solid content and the VOC contents of 2K-PU from SHP-2 was low to 320 g·L^-1.

Key words: trimethylolpropane triglycidyl ether, star hydroxyl polyester, two component polyurethane, high solid coatings, film properties

摘要：

以三羟甲基丙烷三缩水甘油醚（TMPGE）为核分子，利用AB₂型单体2，2-二羟甲基丙酸与ε-己内酯开环反应产物及一元羧酸的羧基与TMPGE的环氧基反应，合成了系列星形羟基聚酯（SHPs），研究了一元羧酸种类及原料配比对SHPs性能的影响。采用FTIR、¹H NMR对SHPs的分子结构进行表征，用GPC对其相对分子质量及分布进行了测试，并考察了其溶液黏度和特性黏度。测试了以甲苯二异氰酸酯/三羟甲基丙烷（TDI/TMP）加成物为固化剂制备的SHPs漆膜性能。SHP-2的溶液黏度低至220 mPa·s（80%固含），用其制备的高固含涂料VOC低于320 g·L^-1，其漆膜具有优异的附着力、柔韧性和较高的硬度。

关键词: 三羟甲基丙烷三缩水甘油醚, 星形羟基聚酯, 双组分聚氨酯, 高固含涂料, 涂膜性能