拟合法分析水性聚氨酯增稠影响因素

Fitting Analyzing the Factors of Waterborne Polyurethane Thickened

采用黏度测试研究了缔合型水性聚氨酯增稠剂(HWPU)的结构对水性聚氨酯(PU)浆料增稠效果的影响,通过EXCEL 2007软件对所得数据进行多元线性回归分析,得到了试验指标黏度(Y)与聚乙二醇相对分子质量(X1)、支化度(X2)、十六烷醇的含量(X3)以及疏水基团的含量(X4)等4个影响因素之间的拟合方程。通过显著性水平检测,验证了拟合方程的可靠性,并确定了影响增稠效果的主要因素为十六烷醇的含量以及疏水基团的含量。由此可以推断,分散在水性PU浆料中的HWPU是通过其疏水链端向四周伸展与浆料分子缔合形成网状结构而达到增稠效果的。

The influence of structure on thickening effect of associative waterborne polyurethane thickener （HWPU） was studied by programmable rheometer. The experimental results were analyzed in multiple linear regression models based on EXCEL 2007 software. The fitting equation was obtained from the relationship between variable （Y） and four affecting factors including molecular weight of polyethylene glycol （X4）, degree of branching （X2）, content of cetyl alcohol （X3） and content of hydrophobic groups （X4）. The reliability of the fitting equation was verified and the main factors of thickening effect were identified as the content of cetyl alcohol and the content of hydrophobic groups. It could be inferred that HW- PU thickened PU slurry by forming the network structure resulting from its hydrophobic side chain association with the slurry particles.