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采用预聚体分散法,以甲苯2,4-二异氰酸酯(TDI)、聚醚(PPG)和二羟甲基丙酸(DMPA)为主要原料,用三乙胺(TEA)为中和剂合成了阴离子水性聚氨酯(PU);以丙烯酸丁酯(BA)为原料,采用乳液聚合的方法制备聚丙烯酸酯乳液(PA),并与PU共混形成(PU+PA)混合乳液。在高压釜中以混合乳液为种子进行氯乙烯(VC)原位共聚,制备了(PU+PA)/PVC复合乳液树脂。通过电子万能试验机、冲击试验机、扫描电子显微镜(SEM)、TA-2000热分析仪和维卡软化点温度测定仪等手段对(PU+PA)/PVC复合树脂进行了测试和表征。结果表明:耐热性较好的PA的加入,不但提高了材料的耐热性能,还能有效地改善复合树脂的抗缺口冲击强度。当PA/PU为4/6,聚醚分子量为3000时,(PU+PA)/PVC复合树脂的缺口冲击强度最大。
Using prepolymer dispersion method, toluene 2,4-diisocyanate (TDI), polyether (PPG) and dimethylolpropionic acid (DMPA) as the main raw materials, with triethylamine (TEA) An anionic water-based polyurethane (PU) was prepared. Polyacrylate emulsion (PA) was prepared by emulsion polymerization from butyl acrylate (BA) and blended with PU to form (PU + PA) mixed emulsion. In-situ copolymerization of vinyl chloride (VC) with a mixed emulsion as seed in an autoclave, (PU + PA) / PVC composite emulsion resin was prepared. (PU + PA) / PVC composite resin was tested and characterized by electronic universal testing machine, impact tester, scanning electron microscope (SEM), TA-2000 thermal analyzer and Vicat softening point temperature detector. The results show that the addition of PA with good heat resistance not only improves the heat resistance of the material, but also effectively improves the notched impact strength of the composite resin. When the PA / PU is 4/6 and the polyether molecular weight is 3000, the notched impact strength of (PU + PA) / PVC composites is the highest.