氨基硅油改性水性聚氨酯的制备与性能

Preparation and Properties of Waterborne Polyurethane Modified by Amino Silicone Oil

摘要:

以氨基硅油（ASO）、聚己内酯二醇（PCL）和异佛尔酮二异氰酸酯（IPDI）为主要原料，2,2-双（羟甲基）丙酸(DMPA)、1,4-丁二醇（BDO）为扩链剂，水合肼为后扩链剂制得ASO改性的水性聚氨酯(Si-WPU)乳液，进一步成膜处理制得Si-WPU膜。采用FTIR、接触角测量仪、TEM、TGA和纳米粒度表面电位分析仪考察了Si-WPU膜的化学结构、疏水性、胶粒形态、热性能以及(Si-WPU)乳液的粒径大小；探究了ASO加入量、异氰酸酯指数（R，预聚物合成过程中NCO与活性基团的物质的量比）对Si-WPU膜力学性能和光泽度的影响。结果表明：当ASO加入量为15%（以PCL的质量为基准），R=1.6时，Si-WPU膜拉伸强度达到最大值（25.9MPa）。当R=1.6时，随着ASO加入量的增加，粒径从35.7nm逐渐增大到134.3nm；Si-WPU膜的力学性能下降，光泽度降低；热分解温度从186.2℃左右开始快速分解，428.4℃时基本分解完全，残重随着ASO加入量的增加逐渐增加；Si-WPU膜与水的接触角从ASO加入量为0时的81.8。逐渐增大到ASO加入量为15%时的107.0。，疏水性增强。

Abstract:

The waterborne polyurethane modified by amino silicone oil(Si-WPU) emulsion was prepared by amino silicone oil(ASO), polycaprolactone glycol(PCL) and isophorone diisocyanate (IPDI) as the main raw materials, 2,2-bis(hydroxymethyl)propionic acid(DMPA), 1,4- butanediol (BDO) as chain extender, hydrazine hydrate as post chain extender. Fourier transform infrared spectroscopy(FTIR), contact angle measuring instrument, transmission microscopy(TEM), thermal gravimetric analyzer(TGA) and nano particle surface potential analyzer confirmed the chemical structure, hydrophobicity, particle morphology, thermal properties of Si-WPU film and particle size of Si-WPU emulsion.The effects of ASO adding amount, isocyanate index(R, the molar ratio of NCO and active groups in the prepolymer synthesis process) on the mechanical properties and glossiness of Si-WPU film was investigated. The results show that the mechanical properties of Si-WPU film reach the maximum of 25.9MPa when the adding amount of ASO is 15% based on the quality of PCL and R value is 1.6. With the increase of ASO adding amount, When R=1.6, the particle size of Si-WPU emulsion increased gradually from 35.7nm to 134.3nm, the mechanical properties and glossiness of Si-WPU film were decreased. The thermal decomposition temperature begins to decompose at about 186.2℃, and decomposes completely at 428.4℃, the residue weight increased with the increase of ASO adding amount, the contact angle between Si-WPU film and water increased gradually from 81.8。when the adding amount of ASO is 0 to 107。when the adding amount of ASO is 15%, and hydrophobicity of the Si-WPU film was enhanced..