室温固化无溶剂双组份聚氨酯结构胶的研究

Study on Solvent-free Room-temperature Curable Two-compenent PU Structure Adhesive

合成了4种相对分子质量和官能度各不相同的聚酯多元醇，并与MDI反应合成了端羟基及端异氰酸基预聚体，通过红外光谱对其结构进行了表征．研究了不同端羟基化合物与端异氰酸基化舍物所构体系的粘接性能、热老化性能及热失重情况，结果表明该体系室温剪切强度为35～40MPa，80℃，100℃和200℃剪切强度可达12～16MPa，6～8MPa和3～5MPa，90°剥离强度为5～7kN／m，T5最高为286℃，加入石棉后体系的高温剪切强度及耐热老化性能都得到提高．

Four polyester polyols with different molecular weight and di-or tri- functional group were synthesized , and isocyanate-and hydroxy-terminated polyurethane（PU）prepolymers were also synthesized using MDI and the trifunctional polyester polyol. The synthesized polyester polyols and PU-prepolymers were examined by FTIR. A series of PU adhesive component based on the polyester polyols, the PU-prepolymer, PAPI and MDI were prepared and their adhesion properties, thermal-aging and thermal weight loss were determined. The results showed that the shear strengths at room temperature, 80℃, 100 ℃ and 200 ℃ were 35-40 MPa, 12-16 MPa, 6-8 MPa and 3-5 MPa, peel strengths were 5-7 kN/m, and T5 was 286℃ The shear strengths at high temperature and thermal-aging properties were improved by adding asbestos. It can be used as structure adhesive.