首页> 外国专利> Novel polyvinyl chloride suspension polymerization process and product having improved plasticizer absorption

Novel polyvinyl chloride suspension polymerization process and product having improved plasticizer absorption

机译:新型聚氯乙烯悬浮聚合方法和增塑剂吸收性提高的产品

摘要

A polyvinyl chloride having high bulk density and enhanced plasticizer absorption is produced by suspension polymerization of vinyl chloride monomer and comonomers wherein the initial suspension of ingredients is generated such that the oil phase droplets formed in the suspension are compositionally equivalent with respect to initiator, and the level of suspending agent and agitation are chosen to substantially preclude agglomeration of resin particles throughout the reaction, thereby producing resin wherein the resin grain size distribution results directly from the oil phase droplet distribution created at or near the start of the reaction. The process is conducted under conditions so that the polymerization is commenced before the final distribution is established. In this manner, seed particles of resin are produced from the vinyl monomer prior to establishing the final particle distribution. The seed particles can be formed (1) by first conducting the process at low speed agitation, followed by increasing the speed of agitation so as to distribute the resin seed particles in the droplets of vinyl monomer, or (2) by preheating the aqueous medium prior to mixing with the vinyl monomer phase so as to initiate polymerization and formation of seed particles before the vinyl monomer droplets achieve their ultimate droplet size. The result of the processes of the invention is a polyvinyl chloride polymer or copolymer that has high bulk density and enhanced plasticizer absorption. A further benefit of the process is that resin deposition on the interior surfaces of the reactor is essentially eliminated.
机译:通过氯乙烯单体和共聚单体的悬浮聚合制备具有高堆积密度和增强的增塑剂吸收性的聚氯乙烯,其中产生成分的初始悬浮液,使得悬浮液中形成的油相液滴相对于引发剂在组成上相等,并且选择悬浮剂的水平和搅拌以基本上防止整个反应过程中树脂颗粒的团聚,从而产生树脂,其中树脂粒度分布直接由在反应开始时或在反应开始时产生的油相液滴分布产生。该方法在一定条件下进行,使得聚合反应在最终分布确定之前就开始了。以这种方式,在建立最终的颗粒分布之前,由乙烯基单体制备树脂的种子颗粒。可以通过以下方法形成种子颗粒:(1)首先在低速搅拌下进行该过程,然后提高搅拌速度,以便将树脂种子颗粒分布在乙烯基单体的液滴中;或(2)通过预热水性介质在与乙烯基单体相混合之前,先引发聚合反应并形成种子颗粒,然后再使乙烯基单体液滴达到其最终液滴尺寸。本发明方法的结果是具有高堆积密度和增强的增塑剂吸收的聚氯乙烯聚合物或共聚物。该方法的另一个优点是,基本上消除了反应器内表面上的树脂沉积。

著录项

相似文献

  • 专利
  • 外文文献
  • 中文文献
获取专利

客服邮箱:kefu@zhangqiaokeyan.com

京公网安备:11010802029741号 ICP备案号:京ICP备15016152号-6 六维联合信息科技 (北京) 有限公司©版权所有
  • 客服微信

  • 服务号