摘要
EP(环氧树脂)/芳香胺胶粘剂固化体系具有良好的粘接性能和耐热性,但其固化温度较高,体系韧性较差且粘接强度不高。采用不同的异氰酸酯和聚醚多元醇按照一定的比例可合成多种端—NCO基PU(聚氨酯)预聚体,并以此作为EP的增韧改性剂。研究结果表明:当R=n(聚醚多元醇3050)∶n[HDI(六亚甲基二异氰酸酯)]=1∶2、w(PU预聚体)=10%(相对于EP质量而言)时,改性EP体系的拉伸剪切强度比未改性EP体系提高了80%。
The curing system of EP（epoxy resin）/aromatic amine adhesive has good bonding properties and heat resistance,but it had some shortcomings such as higher curing temperature,poor toughness,and not high bonding strength. A variety of polyurethane（PU）prepolymers with —NCO-terminal could be synthesized by different isocyanates and polyether polyols according to a certain proportion,and these PU prepolymers were used as toughening modifier of EP. The research results showed that the tensile shear strength of modified EP system was 80% more than that of unmodified EP system when R value or molar ratio of n（polyether polyol 3050）∶n[HDI（hexamethylene diisocyanate）] was 1∶2,mass fraction of PU prepolymer was 10% in EP.
出处
《中国胶粘剂》
CAS
北大核心
2014年第7期29-32,共4页
China Adhesives
关键词
环氧树脂
胶粘剂
聚氨酯
预聚体
混合芳胺
拉伸剪切强度
epoxy resin（EP）
adhesive
polyurethane（PU）
prepolymer
mixed aromatic amine
tensile shear strength
