建筑涂料用极性基团改性聚醚型分散剂的性能研究

Study of the Properties of Polargroup Modified Polyether Dispersant for Architectural Coatings

摘要:

以烯丙基聚氧乙烯醚（APEG-2400）、苯乙烯磺酸钠（SSS）、丙烯酸（AA）为原料，按不同比例聚合得到系列多元共聚分散剂，以此研究醚基、磺酸基、羧基这3类极性基团对分散剂性能的影响。通过红外光谱、凝胶渗透色谱仪和表面张力仪分别对聚合物的官能团、相对分子质量及其分布、表面张力等进行了表征，并探讨了不同官能团及组成比例对水性涂料用粉体的分散效果、涂料细度、粘度、热储稳定性、耐洗刷等应用的影响。结果表明，三元共聚体系下以及数均分子量在4000左右所得分散剂具有更低的表面张力（18.2 mN?m^-1），对应制得的涂料具有更佳的细度（15 μm）、更好的热储稳定性（粘度变化值为3.2 cps），以及理想的耐水刷性（450—500次）。

Abstract:

In this paper， allyl polyoxyethylene ether （APEG-2400）， sodium styrene sulfonate （SSS） and acrylic acid （AA）， were used for the polymerization of dispersants in different proportions. The functional groups， relative molecular weight， distribution and surface tension of the polymer were characterized by IR， gel permeation chromatograph and surface tension meter， respectively. And the effects of different functional groups and composition ratios of the dispersants for powder dispersive capacity and coating properties were discussed. The results showed that the lower surface tension （18.2 mN·m^-1） of the dispersant was obtained by ternary copolymerization structure and number average molecular weight of about 4000. The corresponding coating have better fineness （15 μm）， better heat storage stability （viscosity variation of 3.2 cps）， and ideal scrubbing resistance （450—500 times）.