弹性聚氨酯树脂具有优异的弹性以及其他机械性能,在雷达罩涂料、橡胶涂料中起到至关重要的作用。本文成功合成了不同分子量的聚己内酯树脂PCL1000/2000来代替大赛璐产品PCL-210N/220N,所制备树脂的化学结构和分子量分别通过傅里叶变换红外光谱(FTIR)、质子核磁共振光谱(~1H NMR)和凝胶渗透色谱(GPC)进行了表征。研究了不同种类二元醇聚合物树脂作为线性软段以及NCO/OH物质的量比等对NCO封端预聚物弹性性能的影响,还研究了不同羟基树脂、氨基树脂或者环氧树脂和NCO封端预聚物交联固化对弹性以及其他机械性能的影响。结果表明:选用聚己内酯树脂PCL-1000/2000作为软段、NCO/OH物质的量比为1.5时合成的NCO封端预聚物,与聚天门冬氨酸酯交联固化,断裂伸长率大于400%,拉伸强度大于15 MPa,其他机械性能(附着力、耐磨性)优异。

Elastic polyurethane resin has excellent elastic properties and other mechanical properties,and plays a vital role in radome coatings and rubber coatings.In this paper,polycaprolactone resins PCL1000/2000 with different molecular weights are successfully synthesized to replace the Daicel products PCL-210N/220N.The chemical structures and molecular weights of the prepared resins are determined by Fourier transform infrared spectroscopy(FTIR) and proton nuclear magnetic resonance spectroscopy(~1H NMR) and gel permeation chromatography(GPC) were characterized.The effects of different diol polymer resins as linear soft segments and molar ratio of NCO/OH on the elastic properties of NCO-terminated prepolymers are studied.The effect of cross-linking and curing of different hydroxyl resins,amino resins or epoxy resins and NCO-terminated prepolymers on the elastic properties and other mechanical properties are also studied.The results show that the NCO-terminated prepolymer which the polycaprolactone resin PCL-1000/2000 is selected as the soft segment and the NCO/OH molar ratio is 1.5 is cross-linked and cured with poly aspartate.The elongation is greater than 400%,the strength is greater than 15 MPa,and other mechanical properties(adhesion,wear resistance) are excellent.