提高MDI型聚氨酯抗紫外光老化性能的研究  

Enhancing UV-aging Resistance Properties of MDI-based Polyurethane Coating

作　　者：牟宗波[1] 王全杰[1,2] 

机构地区：[1]陕西科技大学化学与化工学院,陕西西安710021 [2]国家制革技术研究推广中心,山东烟台264005

出　　处：《中国皮革》2012年第21期28-33,共6页China Leather

基　　金：陕西科技大学研究生创新基金资助

摘　　要：通过向MDI型聚氨酯中添加不同抗老化助剂对其改性,利用色差、力学性能、光失重、红外光谱、热性能等测试方法,研究了改性前后聚氨酯的抗紫外光老化性能。结果表明:添加组合抗老化剂(HS-770+UV-P)可以有效抑制聚氨酯的光降解反应和交联反应,表现为能提高聚氨酯的色泽稳定性和力学性能保持率,减少光降解的产物,降低玻璃化转变温度(Tg)的变化程度。MDI - based polyurethane coating was improved with several kinds of additives alone or in combination to enhance the resistance of this coating to UV light. An accelerated aging test was conducted with the aim of comparing the coatings contai ning different additives with blank coating. Color changes, mechanical properties and thermal properties of coatings were studied using various techniques. The results reveales that synergistic mixture （HS -770 ＋ UV -P） is the most effective to suppress photo - degradation and cross - linking of PU, which could be expressed in the improvement of color stability and mechanical proper ties, as well as the decrement of the photolysis production and the change of Tg after UV -aging.

关 键 词：MDI型聚氨酯 光老化 黄变 降解 交联 

分 类 号：TQ323.8[化学工程—合成树脂塑料工业]