【作者】 李军；

【导师】 刘明清； 李强；

【作者基本信息】 四川大学 ， 化学工程， 2002， 硕士

【摘要】 本文首先较详细地介绍了国内外氯乙烯—醋酸乙烯酯共聚树脂的发展及研究应用状况，然后针对目前国内氯乙烯—醋酸乙烯酯共聚树脂生产的薄弱环节，为了开发新型品种，我们采用类似氯乙烯悬浮共聚的方法，以氯乙烯和醋酸乙烯酯作为共聚单体，获得了醋酸乙烯酯含量在4～15％左右的疏松型氯乙烯—醋酸乙烯醋共聚微颗粒树脂。在悬浮共聚体系中，着重研究了二元及三元复合分散体系及其用量比、水油比、醋酸乙烯酯的初始浓度及温度等因素对共聚合反应的影响。付立叶红外光谱(FTIR)分析结果证实了所得产物的分子结构不是氯乙烯(VC)和醋酸乙烯酯(VAc)的混合物，也不是单体各自均聚物的混合物，而是氯乙烯和醋酸乙烯酯的共聚物；扫描电镜(SEM)测试结果表明，氯乙烯—醋酸乙烯酯共聚树脂的颗粒特征呈棉花球状，具典型的疏松型树脂特征；并用聚合物溶液的粘数表示共聚物相对分子质量的大小；哈克流变仪测试表明，该树脂的稳定性较差，在较高温度下加工时，必须加入热稳定剂，这为氯乙烯—醋酸乙烯酯共聚树脂寻求合理的成型加工条件提供了依据。树脂的主要理化指标基本上达到了氯乙烯—醋酸乙烯酯共聚树脂生产企业的企业标准(见附表1．2)。研制氯乙烯—醋酸乙烯酯共聚树脂的主要特点是从“内增塑”方面改善了聚氯乙烯的性能，而且可以通过投料比控制共聚单体的含量，从而适应特殊用途的要求。本研究中所采用的复合分散体系还较好地解决了氯乙烯—醋酸乙烯酯在共聚反应过程中的粘壁和结块技术难题。本研究的成功将为宜宾天原集团有限公司增添了新的品种，具有良好的经济效益前景。更多还原

【Abstract】 In this paper, Copolymers of vinyl chloride (VC) with vinyl acetate (VAc) are obtained by free radical polymerization in suspension system. But VAc contents of copolymers are different. The resin that had 4-15% VAc was made through alarge number of experment. Different VAc content for copolymers have utility in a broad range of large volume applications. This study is focused on influentied the factor of the polymerizing conditions on copolymerization, such as reaction temperature, suspending agents, VC-VAc ratio, oil/water ratio, etc. Molecular weight of VC-VAc resin was characterized by using viscosity. Absolute viscosity of these copolymers were obtained in 1.54-1.65x10-3 pa-s at 25C. Different viscosity shows different molecular weight.The results of this study show that physical and chemical index of resin be content with th demands of the factory standard. It are listed 1.2. The product of the reaction confirm that the infrared spectrgram(1R) is VC-VAc copolymers. The analysis of SEM indicates that the copolymer particles of VC-VAc suspension were spherical such as cotton ball. In addition, heat stability of VC-VAc resin were also investigated by make use of HAAKE torque rheometer at 180C. Expermental results show that heat stability of VC-VAc copolymer was poor. Because of the limited heat stability, it must add to heat stability when resin process at the higher temperatures.更多还原