中国胶粘剂

以聚己二酸1,4-丁二醇酯(PBA)、甲苯二异氰酸酯(TDI)、甲醇和甲乙酮肟(MEKO)为主要原料,制备了不同结构的结晶成核剂,并对水性聚氨酯乳液(WPU)进行改性,得到结晶速度提升的水性聚氨酯热熔黏合剂乳液。通过黏合剂成膜的DSC热循环测试,综合分析了结晶成核剂对水性聚氨酯热熔黏合剂结晶速率、结晶度的影响。研究结果表明:非反应型的结晶成核剂对结晶行为的影响是可循环的,反应型的结晶成核剂在解封闭前后影响不同;结合黏合剂施胶-贴合-剥离测试的结果分析可知,结晶速度是影响剥离强度随时间爬升速率的主要影响因素,但最终剥离强度与胶膜最终的本体强度相关;反应型结晶成核剂用量为15%时,对聚氨酯热熔黏合剂的综合性能提升较佳。

Crystallization nucleating agent with different structures were prepared from poly(1,4-butanediol adipate)(PBA),toluene diisocyanate(TDI),methanol and methyl ethyl ketoxime(MEKO)as the main raw materials.And waterborne polyurethane emulsion(WPU)was modified to obtain waterborne polyurethane hot melt adhesive emulsion with improved crystallization rate. Through the DSC thermal cycle test of the adhesive film formation,the effects of crystallization nucleating agent on the crystallization rate and crystallinity of waterborne polyurethane hot melt adhesive were comprehensively analyzed. The research results showed that the effects of non-reactive crystallization nucleating agent on crystallization behavior was recyclable,while the reactive crystallization nucleating agent had different effects before and after deblocking. According to the results of the adhesive sizing-laminating-peeling test,the crystallization rate was the main factor affecting the climbing rate of peel strength with time,but the final peel strength was related to the final bulk strength of the adhesive film. When the amount of reactive crystallization nucleating agent was 15%,the overall performance of polyurethane hot melt adhesive was improved a lot.