分析了四硼酸钠交联剂对废聚乙烯醇(PVA)薄膜制得的外墙涂料性能的影响,探索了交联机理.实验比较分析了涂料改性前后的耐水性、耐碱性、耐洗刷性和耐沾污性.利用FT-IR分析手段,对交联机理进行了探索.结果表明:改性后涂膜的耐水性、耐碱性和耐洗刷性均明显提高;当交联剂浓度为1.0％,外喷量为180 mL/m2时,改性涂料的耐水性、耐碱性和耐洗刷性分别为2 280 h、768 h和5 100次,较对比试样分别提高了3166.7％、2133.3％和1020.0％.通过FT-IR分析可知,交联剂四硼酸钠中的硼离子与PVA中的—OH发生缩合反应生成网状交联产物.
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