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OALib Journal期刊
ISSN: 2333-9721
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蓖麻油改性巯基-烯uv固化水性聚氨酯分散体的制备
Keywords: 紫外光固化,水性聚氨酯分散体,巯基-烯复合反应,蓖麻油
Abstract:
？采用自乳化聚氨酯水分散体的制备方法，分别制备了含蓖麻油基和巯基的聚氨酯水分散体。将两者按一定比例复合，加入水性光引发剂，在紫外光照射下，通过水性光引发剂引发涂层中的双键及巯基进行巯基-烯点击反应，制得交联聚氨酯涂膜。采用核磁共振氢谱、红外光谱、差示扫描量热仪、热重分析等手段对水分散体及光固化涂膜的结构和性能进行了分析表征。结果表明：巯基和蓖麻油结构中的碳碳双键成功地引入到了水性聚氨酯链段中；在紫外光辐照下，巯基和不饱和双键间进行了加成反应；uv固化膜具有良好的机械性能和热稳定性：凝胶量为96.67％、胶膜吸水率为13.0％、耐冲击性大于50cm、硬度为5h、耐溶剂（甲乙酮）拭擦次数为734次、失质量50％时的温度为375℃。
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