多元醇复配制备耐黄变聚氨酯丙烯酸酯复合乳液

Preparation of anti-yellowing polyurethane-acrylate hybrid emulsion with composite polyols

以异佛尔酮二异氰酸酯(IPDI)、混合多元醇、甲基丙烯酸甲酯(MMA)为主要原料合成了脂肪族聚氨酯丙烯酸酯复合乳液。混合多元醇由聚碳酸酯二醇(PCDL)、聚四亚甲基醚二醇(PTMEG)、聚醚二醇(N220)以不同比例复配而成。重点探讨了PCDL与N220、PTMEG与N220及PTMEG与PCDL复配比例对乳液、胶膜性能的影响。实验发现,当PTMEG与N220以相同质量比复配且控制硬段含量在60%时,得到贮存稳定性好,胶膜硬度高、耐水、耐溶剂性能好、耐黄变性优异的PUA复合乳液。

The aliphatic polyurethane-acrylate hybrid emulsions were prepared with isophorone diisocyanate （IPDI）,composite polyols,and methyl methacrylate （MMA） as the main raw materials.The composite polyols were obtained by mixing polytetramethylene ether glycol （PTMEG） and polyether diol（N220）,PTMEG and polycarbonate diol （PCDL）,PCDL and N220 respectively at different ratio.The influences of mixing ratio of polyols on the properties of polyurethane-acrylate hybrid emulsions and their dry films were mainly discussed.The results showed that the polyurethane-acrylate hybrid emulsions had good stability,high film hardness,good water resistance and solvent resistance and excellent yollowing resistance when PTMEG and N220 were mixed by the same mass ratio and the content of hard segments was 60% in polyurethane prepolymer.