PVC板门用单组份湿固化聚氨酯胶黏剂的研制

采用组合异氰酸酯和组合聚醚多元醇合成可室温固化的单组分聚氨酯胶黏剂。考察NCO／OH的物质的量比对贮存稳定性、反应时间、剥离强度的影响，并论述了引入TDI的作用以及组合溶剂的确定。通过优化配方，合成了用于粘接PVC板材和松木材的新型胶黏剂，并获得良好的粘接强度。结果表明：反应时间随着NCO／OH物质的量比的增大而增加；NCO／OH物质的量比低时，胶的贮存稳定性变差，当比值高时，胶的贮存稳定性好；NCO含量在9％时，胶的剥离强度最高；PAPI：TDI=7：3时，胶的剥离强度达到3．25N／mm。组合溶剂二氯甲烷：丙酮=5：1时，胶的剥离强度达到3．20N／mm。

Study on one component moisture curing polyurethane adhesive for PVC door

The one component room temperature curing polyurethane adhesive was prepared with compound of isocyanate and polyether polyol. The effect of NCO/OH molar ratio on storage stability, reaction time, and peel strength was investigated. The effects of introducing TDI and the confirmation of mixed solvent were discussed. Finally, the adhesive with good bonding property were obtained by optimizing formulation, which was mostly used for PVC board and wood board. The result showed that the increase of molar ratio of NCO/OH would make the reaction time increase. When the molar ratio of NCO/OH was small, the storage stability was poor, just the opposite, it was good. When the content of NCO was 9%, the peel strength was highest. And when the molar ratio of PAPI / TDI was 7： 3, the peel strength reached 3.25 N/mm. The peel strength could reach 3.20 N/mm when the ratio of mixed solvent of dichloromethane to acetone was 5： 1.