【摘要】 采用溶液聚合法制备了聚丙烯酸酯水分散体（PHA），并用4-叔丁基环己基丙烯酸酯（TBCHA）进行改性。讨论了引发剂、异丙醇及TBCHA用量对分散体及涂膜性能的影响。通过红外光谱仪、旋转粘度计、纳米粒度仪及凝胶渗透色谱对样品的结构和性能进行了表征。结果表明，随着引发剂、异丙醇用量的增大，PHA的粘度减小，共聚物的相对分子质量降低。随着TBCHA添加量的增大，PHA粘度显著降低，共聚物相对分子质量无明显变化。胶膜吸水率先降低后增大，涂膜的水接触角增大，表面能降低，热稳定性得到提高。当引发剂、溶剂、TBCHA的质量分数分别为2%,50%和15%时，制备出乳液粘度1 783 mPa·s，共聚物相对分子质量3 188的分散体。由该分散体复配的涂层附着力可达0级，铅笔硬度可达5H，耐冲击可达50 kg·cm，综合性能较好。更多还原

【Abstract】 The aqueous polyacrylate dispersion(PHA)was prepared by solution polymerization and modified with 4-tert-butylcyclohexyl acrylate(TBCHA). The effects of dosage of initiator,isopropanol and TBCHA on dispersion and coating film performance were discussed. The structure and properties of the samples were characterized by infrared spectroscopy,rotational viscometer,nanoparticle size meter and gel permeation chromatography. The results showed that with the increase of the amounts of initiator and isopropanol,the viscosity of PHA decreased and the relative molecular weight of the copolymer decreased. With the increase of TBCHA addition,the viscosity of PHA decreased significantly,and the relative molecular weight of the copolymer did not change significantly. The water absorption of the adhesive film decreased first and then increased. The water contact angle of the coating film increased. The surface energy was reduced and the thermal stability was improved. When the dosage of initiator,solvent and TBCHA was 2wt%,50wt% and 15wt%,respectively,the dispersion with emulsion viscosity of 1 783 mPa·s and relative molecular weigat of 3 188 was prepared. The adhesion,pencil hardness and impact resistance of the coatings compounded by this dispersion could reach level 0,5H and 50 kg·cm,respectively,and the comprehensive performance was better.更多还原