In this paper, isophorone diisocyanate (IPDI), polyethylene glycol (PEG), dimethylolpropionic acid (DMPA) and internal crosslinking agent trimethylolpropane (TMP) were used to prepare waterborne polyurethane. And then...In this paper, isophorone diisocyanate (IPDI), polyethylene glycol (PEG), dimethylolpropionic acid (DMPA) and internal crosslinking agent trimethylolpropane (TMP) were used to prepare waterborne polyurethane. And then double-crosslinked polyurethane-acrylic composite aqueous dispersion was prepared in which polyacrylate was adopted to modify waterborne polyurethane and some special external crosslinking agents were added including silicone and trifunctional aziridine. The influence of the amounts of internal and external crosslinking agents, emulsifier, initiator on the particle size, particle size distribution, viscosity, molecular weight, as well as water adsorption ratio were studied.展开更多
文摘In this paper, isophorone diisocyanate (IPDI), polyethylene glycol (PEG), dimethylolpropionic acid (DMPA) and internal crosslinking agent trimethylolpropane (TMP) were used to prepare waterborne polyurethane. And then double-crosslinked polyurethane-acrylic composite aqueous dispersion was prepared in which polyacrylate was adopted to modify waterborne polyurethane and some special external crosslinking agents were added including silicone and trifunctional aziridine. The influence of the amounts of internal and external crosslinking agents, emulsifier, initiator on the particle size, particle size distribution, viscosity, molecular weight, as well as water adsorption ratio were studied.
文摘为了提高丙烯酸树脂的耐水性、附着力以及耐溶剂性,以桐油酸和环氧树脂E-44为原料制备环氧酯,采用溶液聚合和自乳化工艺合成了环氧酯改性水性丙烯酸树脂,并引入氰特CY325氨基树脂制备双组分环氧酯改性水性丙烯酸树脂漆膜。利用FT-IR、1 H NMR、粒径测试等对环氧酯单体、环氧酯改性水性丙烯酸树脂的结构和性能进行表征和分析,并测试了单组分和双组分环氧酯改性水性丙烯酸树脂漆膜的硬度、光泽、吸水率、水接触角、耐溶剂性等性能。结果表明:当环氧酯用量为35%时,单/双组分漆膜综合性能达到最佳,双组分漆膜光泽(60°)达102.3,耐溶剂擦拭次数为500次,耐水性可达480 h,附着力为0级,铅笔硬度为4H,耐冲击性为50 cm。