Abstract: Waterborne polyurethane (WPU) modified by epoxy soybean oil (ESO) and 3-aminopropyltriethoxysilane (KH550) were synthesized. The properties of the modified WPU were characterized by FTIR, TG, DSC, DMA, AFM, particle size analyzer and tensile test machine. The effects of contents of ESO and KH550 on the properties of WPU emulsion, its film and adhesive strength were studied. And the effect of KH550 on the crystallinity and microphase separation of WPU was analyzed. With the increase of contents of ESO and KH550, the properties of WPU dispersion were improved, the water absorption of WPU film decreased first, and then increased. Tensile strength increased, while elongation at break decreased. The T-peel strength of the adhesive to PVC/PVC increased first, and then decreased. With increasing KH550 content, thermal stability of the WPU film was improved, crystallinity decreased, degree of mixing of soft segment phase and hard segment phase was enhanced. When the contents of ESO and KH550 were 4% and 2%(mass), respectively, the properties of WPU adhesive were perfect.

Key words: epoxy soybean oil, 3-aminopropyltriethoxysilane, polymers, crystallinity, mechanical property, adhesive property

摘要： 以环氧大豆油(ESO)与3-氨基丙基三乙氧基硅烷(KH550)双重交联改性水性聚氨酯(WPU).通过FTIR、TG、DSC、DMA、AFM、粒径分析仪、拉力试验机等仪器对改性的水性聚氨酯进行了表征.研究了ESO和KH550的含量对水性聚氨酯乳液、胶膜以及胶黏剂性能的影响.分析了KH550对水性聚氨酯结晶性能和微相分离的影响.研究发现,随着ESO与KH550的加入,水性聚氨酯乳液的性能得到改善,胶膜的吸水率先减小后增大,拉伸强度逐渐增大,断裂伸张率逐渐减小.水性聚氨酯胶黏剂对PVC的T-剥离强度先增大后减小.随着KH550含量的增加,热稳定性逐步改善,结晶性降低,软段与硬段相混合程度提高.当ESO为4%、KH550为2%(均为质量分数)时,水性聚氨酯胶黏剂的综合性能最好.

关键词: 环氧大豆油, KH550, 聚合物, 结晶性能, 力学性能, 粘接性能