Effects of AAS/DMPA on crystallinity of films of waterborne polyurethane

doi:10.3969/j.issn.0438-1157.2013.07.049

Abstract

Abstract: Waterborne polyurethane (WPU)with 50% solid content were synthesized by using polyethylene glycol adipate diol (PBA),isophorone diisocyanate (IPDI)and hexamethylene diisocyanate (HDI)as main raw materials,N-(2-aminoethyl)-amino ethane sulphonated sodium (AAS)and dimethylol propionic acid (DMPA)as hydrophilic chain extender.The effects of AAS/DMPA molar ratio on crystallinity of WPU film were investigated by means of DSC,XRD and light transmittance measurement,and in turn the influence of crystallinity on water resistance and heat resistance was also studied by experiments of water absorption and thermal stability of WPU films.The results showed that with the increase of AAS/DMPA,relative crystallinity of the WPU films was enhanced.Consequently,to some degree,water resistance and heat resistance of WPU films were improved.

Key words: waterborne polyurethane, crystallinity, sulphonate/carboxylate, water resistance, heat resistance

摘要： 以聚己二酸1,4-丁二醇酯(PBA)、六亚甲基二异氰酸酯(HDI)、异佛尔酮二异氰酸酯(IPDI)为主要原料,以混合的乙二胺基乙磺酸钠(AAS)和二羟甲基丙酸(DMPA)为亲水性扩链剂,通过丙酮法合成了固含量为50%的磺酸/羧酸盐型水性聚氨酯(WPU)乳液。采用DSC、XRD、透光率等测试技术表征了AAS/DMPA摩尔比对WPU胶膜结晶性的影响,并从吸水率和热失重两个方面分析了结晶性对胶膜耐水性和耐热性的影响。研究结果表明,随着AAS/DMPA摩尔比的增大,WPU胶膜的结晶性提高,胶膜的耐水性和耐热性在一定程度上得到了改善。

关键词: 水性聚氨酯, 结晶性, 磺酸/羧酸盐, 耐水性, 耐热性

CLC Number:

CAO Gaohua, XIA Zhengbin, ZHANG Yanhong, LI Wei. Effects of AAS/DMPA on crystallinity of films of waterborne polyurethane[J]. CIESC Journal, 2013, 64(7): 2672-2678.

曹高华, 夏正斌, 张燕红, 李伟. AAS/DMPA对水性聚氨酯胶膜结晶性能的影响[J]. 化工学报, 2013, 64(7): 2672-2678.

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