羟基硅油改性磺酸型水性聚氨酯的合成及性能

Synthesis and Properties of Hydroxyl Silicone Oil Modified Sulfonated Waterborne Polyurethane

摘要:

以磺酸型聚酯二元醇（BY3301）、甲苯二异氰酸酯（TDI）为主要原料，羟基硅油为改性剂，三羟甲基丙烷（TMP）为交联剂合成羟基硅油改性磺酸型水性聚氨酯。采用FT-IR，TG、数显黏度计、纳米粒度仪等表征聚合物的结构与性能，探讨了羟基硅油含量对乳液及胶膜性能的影响。结果表明：随着羟基硅油含量增加，聚合物性能明显提高，乳液粒径增大，黏度降低；胶膜表面水接触角增大，吸水率减小；胶膜拉伸强度增强，断裂伸长率先增后降。当羟基硅油含量为3%时，聚合物性能最佳，其乳液粒径为85.1nm，黏度为114.5 mPa•S，胶膜水接触角为91.7°，拉伸强度为14.78MPa，断裂伸长率为427%，24h吸水率仅为5.61%，由TG曲线可知，胶膜质量损失5%时，对应温度为269.9℃，较之改性前提高17.3℃。

Abstract:

A serious of hydroxyl silicone oil modified sulfonated waterborne polyurethane was synthesized with sulfonated polyester diols (BY3301), toluene diisocyanate (TDI) as the main raw materials, hydroxyl silicone oil as the modifier and with trimethylol propane(TMP) as the crosslinking agent. The structure and properties of the obtained polymer were characterized by FTIR and TG,digital display viscosity meter,nanoparticle size analyser, etc. And the effects of hydroxy silicone oil content on the properties of emulsion and film were investigated. The results show that with the increase of content of hydroxy silicone oil, the properties of polymer had been improved obviously.the particle size of the emulsion increases and the viscosity decreases, the water contact angle increases, and water absorption of film decreases. The tensile strength of the film gradually increases, and the elongation at break increases. When hydroxyl silicone oil content is 3%, the film has the best comprehensive performance. At the same time, the emulsion particle size is 85.1 nm, viscosity is 114.5 mPa•s, water contact angle is 91.7°, the tensile strength is 14.78MPa, the elongation at break is 427%, water absorption of 24 h is 5.61%. The TG curve shows that when the loss of film quality is 5%, the corresponding temperature is 269.9 ℃, increased by 17.3 ℃ compared with unmodified.