高固含芳香族水性聚氨酯的制备与性能研究

Study on Preparations and Properties of High Solid Aromatic Waterborne Polyurethane

以1,4-丁二醇-2-磺酸钠作为亲水基团,采用磺酸型预聚体(WPU-2)在水性聚氨酯(WPU-1)中乳化,制备出磺酸/羧酸高固含芳香族水性聚氨酯(WPU-3)。随着WPU-2中1,4-丁二醇-2-磺酸钠的含量由2%增加到6%,其WPU-3的乳液粒径逐渐变小,粘度逐渐增大,WPU-3胶膜的吸水率由7.9%升到了11.2%,拉伸强度由11.7 MPa增加到14.8 MPa,断裂伸长率由600%下降到480%,其热分解温度T5%由221℃下降到181℃,玻璃化转变温度由-58.3℃升到了-51.5℃。

Through emulsification of aqueous polyurethane(wpu-1)by sulfonic acid prepolymer(wpu-2),high solid aromatic waterborne polyurethane with sulfonic acid/carboxylic acid(WPU-3)was prepared by using 1,4-butanediol-2-sulfonic acid sodium as the hydrophilic group.The content of 1,4-butanediol-2-sulfonic acid sodium increased from 2%to 6%,the emulsion particle size of WPU-3 decreased,the viscosity increased gradually,the water swelling rate of the WPU-3 film increased from 7.9%to 11.2%,the tensile strength increased from 11.7 MPa to 14.8 MPa,and the elongation at break decreased from 600%to 480%.The thermal decomposition temperature of T5%decreased from 221℃to 181℃,and the glass transition temperature increased from-58.3℃to-51.5℃.