Study on Synthesis and Thermal Stability of Non-amine Waterborne Polyurethane-polyacrylate

Xiaojuan Lai ； Jiahui Liu ； Guiru Liu ； Lei Wang ； Qinghai Ren

《淡江理工學刊》 22卷1期 (2019/03) Pp. 145-152

https://doi.org/10.6180/jase.201903_22(1).0014

摘要

In order to satisfy the low VOC and temperature resistance of coating requirements in cigarette printing industry. Waterborne polyurethane polyacrylate emulsion (WPUA) was synthesized with thermotolerant polyester diol (NCL), 4,4'-dicyclohexyl methane diisocyanate (HMDI) and methyl methacrylate (MMA) as raw materials, using both carboxylic acid and sulfonate as hydrophilic chain extender agent. WPUA with zero VOC and no triethylamine was prepared by solvent-free method to meet the requirements of cigarette packaging industry. The WPUA emulsions and films were characterized by FT-IR, transmission electron microscope (TEM), particle size analysis and thermogravimetric analysis (TGA). The effects of different kinds of isocyanates, polyalcohol and chain extender on thermal stability of the WPUA films were investigated. The results showed that the average particle size of the emulsion was reduced due to the addition of aliphatic diamine sulphonate (AAS). TGA results showed that the decomposition temperature of WPUA film synthesized by NCL, HMDI and novel chain extender hydroquinone bis(β-ethyl) ether (HQEE) was higher than that of WPUA film synthesized by polycaprolactone diol (PCL), isophorone diisocyanate (IPDI) and 1,4-Butanediol (BDO), the decomposition temperature increased by 60.96 ℃, 69.37 ℃, 139.70 ℃ when the mass loss rate of WPUA film was 20%, 30%, 50%. And glass transition temperature (Tg) of polyurethane increased with the enhancement of the symmetry and rigidity of molecules.

關鍵字

Polyurethane-polyacrylate ； Emulsion Polymerization ； Thermal Stability ； Heat Resistance