摘要
以聚醚二元醇(N210)、异佛尔酮二异氰酸酯(IPDI)、羟基硅油为原料,合成了异氰酸酯基封端的含硅聚氨酯预聚体(PU-Si),再以PU-Si、环氧树脂E-51、丁基缩水甘油醚单封端的四乙烯五胺(TEPA-660a)为主要原料,制备了含硅聚氨酯改性水性环氧树脂固化剂,将制得的环氧树脂固化剂与环氧树脂E-51混和制得固化膜。用FTIR、TEM、SEM、TG和水接触角测试仪对聚合物的结构与性能进行了表征与测试,并考察了PU-Si含量对固化剂乳化性能、固化膜力学性能、热性能、断面形貌及吸水率的影响。结果表明:当固化膜中PU-Si的质量分数达到18%时,固化膜的综合性能最佳,此时冲击强度为22.45 k J/m^2,拉伸强度为44.7 MPa,热失重5%和50%时的温度分别为205.0和373.8℃,水接触角为96.8°,吸水率仅1.35%,与纯环氧树脂固化膜相比,其柔韧性、耐热性、耐水性等性能均有显著提高。
Isocyanate group-terminated polyurethane polyether diols （ N210 ）, isophorone diisocyanate prepolymer （PU-Si） was synthesized with （IPDI）, hydroxyl silicon as raw materials. Subsequently, a waterborne curing agent modified by polyurethane containing silicon was prepared using PU-Si, epoxy resin （E-51） and single butyl glycidyl ether terminated tetraethylenepentamine （TEPA-660a）. The structure and properties of the obtained polymer were characterized by means of FTIR, TEM, SEM, TG and water contact angle measurement. Moreover, the effect of PU-Si content on emulsifying property of curing agent, mechanical properties, thermal properties, impact fractured surfaces and water absorption of the cured film was investigated. The results showed that when PU-Si content was 18% （mass fraction） ,the cured film had the best comprehensive performance. The impact strength was 22.45 kJ/m2, the tensile strength was 44. 7 MPa, the characteristic decomposition temperature at 5% and 50% mass loss was 205.0 ℃ and 373.8 ℃, the water contact angle was 96. 8%, and the water absorption was only 1.35%. The toughness, heat resistance, and water resistance of the above cured film enhanced markedly compared with that of the pure epoxy cured film.
出处
《精细化工》
EI
CAS
CSCD
北大核心
2017年第5期582-587,共6页
Fine Chemicals
基金
国家自然科学基金(51173001)~~
关键词
环氧固化剂
聚氨酯预聚体
羟基硅油
力学性能
热性能
建筑用化学品
epoxy curing agent
polyurethane prepolymer
hydroxyl silicone
mechanical properties
thermal properties
building chemicals
