目的 制备水溶性聚氨酯热熔胶。 方法 用聚乙二醇（PEG）和甲苯二异氰酸酯（TDI）为原料， 制备水溶性聚氨酯热熔胶， 研究了 PEG的相对分子质量、TDI 滴加温度、原料配比和反应时间等对水溶性聚氨酯热熔胶性能的影响。 结果 当 PEG8000， PEG600， PEG200， 乙二醇和 TDI 的摩尔比为 1∶1∶0.8∶1∶4， TDI的滴加温度为 60～ 70 ℃、反应时间为 4 h时， 所得水溶性聚氨酯热熔胶的软化点为 59.5 ℃、粘接强度为 2.668 MPa。 结论 制备的水溶性聚氨酯热熔胶可以作为电子产品零配件等工业半成品的表面保护膜。

Objective To prepare the water-soluble polyurethane hot melt adhesive. Methods Water-soluble polyurethane hot melt adhesive was prepared using polyethylene glycol (PEG) and toluene diisocyanate (TDI) as raw materials. The effects of PEG molecular weight, raw material ratio, TDI addition temperature, and reaction time on product properties were discussed. Results At a PEG8000∶PEG600∶PEG200∶glycol∶TDI molar ratio of 1∶1∶0.8∶1∶4, a TDI addition temperature of 60～ 70 ℃, and a reaction time of 4 h, the as-obtained product exhibited a softening point of 59.5 ℃, and an adhesive strength of 2.668 MPa. Conclusion This water-soluble polyurethane hot melt adhesive could be used as surface protection film of industrial semi-finished products.