腐植酸改性水性聚氨酯的制备及其性能

Preparation and Properties of Humic Acid Modified Waterborne Polyurethane

摘要:

以聚己内酯二元醇（PCL）、异佛尔酮二异氰酸酯(IPDI)、二羟甲基丙酸（DMPA）、三羟甲基丙烷（TMP）为基本原料，腐植酸（HA）为改性剂，合成了一系列腐植酸改性的水性聚氨酯乳液（HAWPU）。采用FTIR、DLS、TGA、SEM、力学分析等对HAWPU进行了结构表征和性能测试，考察了HA添加量对HAWPU乳液外观、粒径以及成膜吸水率、热稳定性、机械性能的影响。结果表明：HAWPU乳液都具备良好的粒径分布和贮存稳定性。当HA质量分数为0.3%（占乳液体系总质量）时，HAWPU乳液平均粒径仅为47.60nm；胶膜的拉伸强度可达52.54MPa,相比于WPU提高了55.8%；热稳定性也明显提高，损失质量分数50%（占胶膜热解前质量）的温度为334℃，高于WPU胶膜（322℃）。

Abstract:

A series of humic acid modified waterborne polyurethane emulsions (HAWPU) were successfully synthesized with poly-caprolactonediol (PCL), isophoronediisocyanate (IPDI), dimethylolpropionic acid (DMPA), trimethylolpropane (TMP) as the basic raw material and humic acid (HA) as the modifier. The structural characterization and performance tests of HAWPU were carried out by FTIR, DLS, TGA, SEM and mechanical analysis. The effects of HA addition on the appearance, particle size and Water absorption rate, thermal stability and mechanical properties of HAWPU emulsion were investigated. The results showed that HAWPU emulsions had good particle size distribution and storage stability. When the HA mass fraction is 0.3% (accounting for the total mass of the emulsion system), the average particle size of the HAWPU emulsion is only 47.60 nm. The tensile strength of the film can reach 52.54MPa, which is 55.8% higher than WPU. The thermal stability is also significantly improved, and the temperature at which the mass fraction is lost by 50% (the mass before the film is pyrolyzed) is 334 ℃, which is higher than that of the WPU film (322 ℃).