摘要： 采用异佛尔酮二异氰酸酯、聚乙二醇为原料，以三羟甲基丙烷为扩链剂、正十六醇为封端剂合成了 3 种不同结构的聚氨酯缔合增稠剂（HEUR） IP-C、IP-C-T 和 IP-T-C。 通过傅里叶红外光谱（FT-IR）证明了反应的发生。 采用应力控制型流变仪对 HEUR 在水相与乳液体系中的流变行为进行了研究。 结果表明：3 种 HEUR 都具有明显的增稠和触变性能，高剪切时出现明显的剪切变稀现象。相比与线性结构的 IP-C，含星型和支化结构的 IP-C-T 与 IP-T-C 由于能在水相和乳液中形成更为完善和稳定的疏水缔合网络，增稠效果更佳，而 IP-T-C 由于其结构中含有更多的支化结构因此增稠效果最佳。 将增稠剂应用于乳液时，IP-C-T 和 IP-T-C 的贮能模量（G'）均大于损耗模量（G″），表现出了明显的粘性行为，这表明星型和支化结构的 HEUR 在疏水缔合增稠剂领域应用前景较佳。

关键词: 聚氨酯缔合增稠剂, 结构, 流变行为, 增稠效果

Abstract: Three different structure of polyurethane associative thickener(HEUR) including IP-C, IP-C-T and IP-T-C were synthesized by using isophorone diisocyanate, polyethylene glycol as raw materials, trimethylolpropar as chain extender and hexadecanol as blocking agent. The FT-IR indicated that the HEUR had been obtained. The rheological behavior of the three HEURs in aqueous phase and emulsion system were studied by stress controlled rheometer. The result showed that the three HEURs gave obvious thickening and thixotropic properties and exhibited obvious shear-thinning phenomenon under high shear rate.Compared to the IP-C having linear structure, the IP-C-T and IP-T-C having star and branch structure could form more perfect and stable hydrophobic associative network in aqueous phase and emulsion, showing better thickening effect. Moreover, the IP-T-C showed the best thickening effect due to its branch structure more than others. The storage modulus (G') of IP-C-T and IP-T-C were higher than the loss modulus (G")as applied in emulsion, showing obviously the sticking behavior, which indicated the HEUR having star and branch structure gave better applications.

Key words: polyurethane associative thickener, structure, rheological behavior, thickening effect