水性聚碳酸酯型聚氨酯的制备及性能
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摘要
本工作制备了稳定性良好的水性聚碳酸酯型聚氨酯(WPCU),并对其进行了红外表征,分析了不同异氰酸酯指数(R=n(NCO)/n(OH))及二羟甲基丙酸(DMPA)、三羟甲基丙烷(TMP)用量对WPCU性能的影响。以最佳配方合成的WPCU与水性聚酯型聚氨酯在性能上作对比,研究表明:当异氰酸酯指数为7时,制备的聚碳酸酯型聚氨酯力学性能良好,拉伸强度达12.46 MPa,吸水率仅为25.88%;TMP可以增加WPCU的交联度,其用量由0.5%增加到1.5%时,聚氨酯的拉伸强度由4.33 MPa增加到7.56 MPa,断裂伸长率由307.12%下降到258.53%;相同分子量的情况下,与聚酯型水性聚氨酯(PESTUR)相比较,WPCU力学性能更好,硬度达2H,拉伸强度高6倍以上。
A waterborne polyurethane with great stability was prepared and characterized by FT-IR in this work. This study analyzed the impact of different isocyanate index(R=n(NCO)/n(OH)), dimethylolpropionic acid(DMPA) and trimethylolpropane(TMP) content on the physical properties of WPCU. The study contrasts the performance of the best synthetic WPCU and polyester polyurethanes. The research found that: When the isocyanate index is 7, the prepared polycarbonate polyurethane has good mechanical properties. The tensile strength is up to 12.46 MPa, and the water absorption rate is only 25.88%. Adding TMP can increase the degree of crosslinking of the polyurethane. When the amount of TMP is increased from 0.5% to 1.5%, the tensile strength increases from 4.33 MPa to 7.56 MPa, and the elongation at break decreases from 307.12% to 258.53%. In the case of the same molecular weight, the WPCU has higher mechanical properties, hardness of 2 H, and tensile strength is 6 times higher compared with the polyester type waterborne polyurethane(PESTUR).
A waterborne polyurethane with great stability was prepared and characterized by FT-IR in this work. This study analyzed the impact of different isocyanate index(R=n(NCO)/n(OH)), dimethylolpropionic acid(DMPA) and trimethylolpropane(TMP) content on the physical properties of WPCU. The study contrasts the performance of the best synthetic WPCU and polyester polyurethanes. The research found that: When the isocyanate index is 7, the prepared polycarbonate polyurethane has good mechanical properties. The tensile strength is up to 12.46 MPa, and the water absorption rate is only 25.88%. Adding TMP can increase the degree of crosslinking of the polyurethane. When the amount of TMP is increased from 0.5% to 1.5%, the tensile strength increases from 4.33 MPa to 7.56 MPa, and the elongation at break decreases from 307.12% to 258.53%. In the case of the same molecular weight, the WPCU has higher mechanical properties, hardness of 2 H, and tensile strength is 6 times higher compared with the polyester type waterborne polyurethane(PESTUR).
引文
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2 许戈文.聚氨酯材料,化学工业出版社,2006.
3 郝广杰,张邦华,宋谋道,等.高分子材料科学与工程,2000,16(2),148.
4 陈福建,李晓,张卫英,等.石油化工,2008,37(10),1049
5 冉岚,刘少友,唐文华.中国胶黏剂,2013,22(12),6
6 高笑飞,吴明华,洪国沈,等.印染助剂,2013,30(7),19
7 卢秀萍,王文杰.聚氨酯工业,2006(4),18
8 杨清萍.大豆油基水性聚氨酯SiO2纳米复合材料研究.硕士学位论文,五邑大学,2016.