Abstract

As the laws about emission of volatile organic compounds (VOCs) become more and more stringent, low VOC content coatings, such as high solid polyurethane coating, gradually attract great attention. Herein, a series of star-shaped hydroxyl polyesters (SHPs) were synthesized by methyl hexahydrophthalic anhydride (MHHPA), diisopropanolamine (DIPA), and monoglycidyl ether. The number of their average molecular weights is ranged from 913 to 1390 with 1.55–1.75 of PDI. The viscosities of SHPs are low to 1060 mPa·s. The molecular structures of SHPs were characterized by Fourier transform infrared (FTIR) and ¹H nuclear magnetic resonance (¹H NMR) spectroscopies. The high-solid two-component polyurethane coatings (2 K-PU) from SHP-3 have a 65% of the solid contents and exhibit 20 mPa·s of the applied viscosity with 310 g/L of VOC contents. Moreover, the polyurethane film displays high coating hardness up to 2H, as well as excellent chemical resistance and good thermal stability.

摘要

随着挥发性有机化合物（VOCs）排放法规越来越严格，低VOC含量的涂料，如高固体份聚氨酯涂料，逐渐引起人们的广泛关注。在此，由甲基六氢邻苯二甲酸酐（MHHPA）、二异丙醇胺（DIPA）和单缩水甘油醚合成了一系列星形羟基聚酯（SHP）。它们的平均分子量范围为 913 至 1390，PDI 为 1.55-1.75。SHP 的粘度低至 1060 mPa·s。SHPs 的分子结构通过傅里叶变换红外 (FTIR) 和¹ H 核磁共振 ( ¹H NMR）光谱。SHP-3 的高固体分双组分聚氨酯涂料 (2 K-PU) 具有 65% 的固含量和 20 mPa·s 的应用粘度和 310 g/L 的 VOC 含量。此外，聚氨酯薄膜显示出高达 2H 的高涂层硬度，以及优异的耐化学性和良好的热稳定性。