双组分聚氨酯胶黏剂的研究

Study on Two-component Polyurethane Adhesives

合成了四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。用聚醚多元醇与TDI及HDI反应合成了端异氰酸基预聚体。研究了不同体系的粘接性能及热失重情况,结果表明-OH/-NCO固化体系室温剪切强度为35～40MPa、90度剥离强度为5～7kN/m,-NCO/-NH2固化体系室温剪切强度为20～30MPa、90度剥离强度为6～15kN/m。研制的聚氨酯胶黏剂具有优异的耐磨、耐空蚀性能,可用于水轮机过流部件的修补及材料的结构粘接。

Four kinds of polyester polyols with different molecular weight and di- or trifunctional groups are synthesized.Hydroxyl groupterminated and isoeyanate-tenninated polyurethan（PU ）prepolymers are synthesized with using MDI and the trifunetional polyester polyol,and they are also prepared with using TDI and HDI with polyether polyol. The synthesized polyester polyols are examined by FTIR. A series of PU adhesives are prepared and their adhesion properties are determined. The results show that the shear strengths at room temperature are 35-40MPa, 90°peel strengths are 5-7kN/m of -OH/-NCO curing system, and the shear strengths at room temperature are 20-30MPa, 90°peel strengths are 615kN/m of -NCO/-NH2 curing system. The PU adhesives have excellent wear and corrosion resistance properties,it can be used for repairing wearing surface of water turbine transition parts and structural adhesion of many materials.