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作 者:马玉春[1,2] 郑水蓉[1,2] 孙曼灵[1] 刘斌[1] 康媛[1]
机构地区:[1]西北工业大学理学院应用化学系,陕西西安710072 [2]西北工业大学-华东理工大学高速铁路新材料联合研究所,陕西西安710129
出 处:《中国胶粘剂》2012年第10期43-47,共5页China Adhesives
摘 要:以异辛酸铅为催化剂、多异氰酸酯(M-200)和聚醚多元醇(N-220、N-330)为主要原料,合成了PU(聚氨酯)灌封胶,并对其性能进行了研究。结果表明:气泡对PU灌封胶的力学性能有显著影响;当w(异辛酸铅)=0.006%(相对于总物质质量而言)、R=n(-NCO)/n(-OH)=0.90和R′=n(N-330中-OH)/n(N-220中-OH)=2.3时,PU灌封胶的力学性能、施工性能、耐水性能和电绝缘性能(绝缘强度为22.86 kV/mm、体积电阻率为1.11×1013Ω.cm和表面电阻率为1.52×1015Ω)俱佳。With lead isocaprylate as catalyst, muhi-isocyanate (M-200) and polyether polyol (N-220, N-330) as main raw materials,a PU (polyurethane) pouring sealant was synthesized,and its properties were investigated. The results showed that the influences of air bubble on mechanical properties of PU pouring sealant were outstanding. The PU pouring sealant had better mechanical properties,operation property,water resistance and electrical insulating properties (dielectric strength at 22.86 kV/mm, volume resistivity at 1.11 ×10^13Ω·cm, and surface resistivity at 1.52×10^15Ω) when mass fraction of lead isocaprylate was 0.006% in total substances ,R or molar ratio of n(- NCO)/n(-OH) was 0.90,and R' or molar ratio of n(- OH in N-330)/n(-OH in N-220) was 2.3.
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