氨基硅油HTBN型聚氨酯的合成及性能研究

Study on synthesis and performance for HTBN/polyurethane modified by amino-terminated siloxane

以端羟基聚丁二烯-丙烯腈(HTBN)为软段、甲苯二异氰酸酯(TDI)为硬段和端氨基硅油为改性剂,合成了端氨基硅油改性HTBN型聚氨酯(PU)。以n(-NCO)∶n(HTBN)、n(硅油)∶n(HTBN)、n(扩链剂)∶n(HTBN)和硅油加入方式为主要影响因素,采用L9(34)正交实验方法研究了各因素对端氨基硅油改性HTBN型PU的力学性能和耐介质性能的影响。研究结果表明,氨基硅油的引入能有效改善PU产物的断裂伸长率和耐介质(水、真空油、甲苯和乙醇)性能,PU产物在各种介质中的稳定性依次为真空油>水>乙醇>甲苯,R值对PU产物力学性能的影响依次为断裂伸长率>邵氏硬度>拉伸强度>定伸应力。

With hydroxyl-terminated polybutadiene/acrylonitrile （HTBN） as soft chain segment,toluene diisocyanate（TDI） as hard chain segment and amino-terminated siloxane as modifier,a series of HTBN/polyurethanes（PU） modified by amino-terminated siloxane were synthesized. With molar ratio of-NCO to HTBN（namely R value）, molar ratio of amino-terminated siloxane to HTBN,molar ratio of chain extender to HTBN,and additive wise of amino-terminated siloxane as four main factors,so the influences of various factors were investigated by L9（3^4） orthogonal experiments on mechanics performance and medium-resistance of HTBN/PU modified by aminoterminated siloxane. The research results showed that the elongation at break and medium-resistance（namely water resistance,oil resistance,toluene resistance and ethanol resistance） of PU product were improved when aminoterminated siloxane was introduced into PU systems. The stability of PU product in various medium was： vacuum oil〉water〉 ethanol 〉toluene. The influences of R value on mechanical performance of PU product was： elongation at break〉shore hardness〉tensile strength〉stress at definite elongation.