丙烯酸酯改性水性醇酸树脂的制备及表征

Preparation and characterization of acrylate modified waterborne alkyd resin

以三羟甲基丙烷、邻苯二甲酸酐及亚麻油脂肪酸为主要原料生成所需的醇酸树脂,并加入偏苯三酸酐将其水性化得到具有水溶性的醇酸树脂,运用接枝共聚的方法进行改性得到丙烯酸酯改性的水性醇酸树脂。通过涂膜性能测试研究了引发剂种类、水性醇酸树脂与丙烯酸酯的比例、玻璃化温度对改性树脂性能的影响。采用激光粒度分布仪测定了产物的平均粒径分布及稳定性,红外光谱研究了产物的基团结构,运用核磁对丙烯酸酯接枝位置进行了分析,通过透射电镜(TEM)表征树脂的微观状态。结果表明,当引发剂为偶氮二异丁腈时,水性醇酸树脂与丙烯酸酯的比例为3∶1,玻璃化温度为87.5℃时性能较优。

Using trimethylolpropane,phthalic anhydride and linolenic acid as raw materials,a desired alkyd resin is produced,and trimellitic anhydride is added to make it water-based to obtain a water-soluble alkyd resin,and use a graft copolymerization method.The acrylate is grafted onto the alkyd resin to obtain an acrylate-modified waterborne alkyd resin.The effects of trimellitic anhydride,the reaction between trimellitic anhydride,the ratio of butyl acrylate to acrylic acid,and the ratio of waterborne alkyd resin to acrylate on the properties of the modified resin were investigated by coating performance test.The average particle size distribution of the product was measured using a laser particle size distribution meter,and the radical structure of the product was investigated by infrared spectroscopy and transmission electron microscope(TEM).The results showed that the appropriate reaction conditions were as follows:the initiator is azobisisobutyronitrile,aqueous alkyd and acrylate 3∶1,glass transition temperature is 87.5℃.