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浅谈PVC树脂中残留VCM脱吸的影响因素及改进措施

Introduction to factors influencing the desorption of residual VCM from PVC resin and improvement measures for it

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【作者】 张宏宇刘广宇徐华安马艳梅陈立志宋明霞

【Author】 ZHANG Hong-yu,LIU Guang-yu,XU Hua-an,MA Yan-mei,CHEN Li-zhi,SONG Ming-xia (Qihua Chemical Industry Co.,Ltd.,Qiqihar 161033,China)

【机构】 黑龙江齐化化工有限责任公司!黑龙江齐齐哈尔161033黑龙江齐化化工?

【摘要】 通过PVC树脂中VCM脱吸机理和影响因素的分析 ,提出了改进措施 :(1)减少分散剂用量、加入低分子质量、低醇解度的聚乙烯醇 (LL - 0 2 ) ;(2 )在聚合配方中添加NH3·H2 O和NH4 HCO3;(3)当聚合釜压力降为 0 .15~ 0 .2 0MPa时加终止剂 (此时转化率在 85 %以下 )终止反应。采取改进措施后 ,改进了PVC树脂颗粒的皮膜结构 ,使PVC树脂中残留的VCM含量小于 5× 10 -6,达到了无毒级PVC树脂的要求。

【Abstract】 Through analyzing on the mechanism of the desorption of VCM from PVC resin and its ,influencing factors the following improvement measures are proposed:(1)reducing the using amount of dispersant agents,adding poly(vinyl alcohol) (LL-02) with low molecular weight and low alcoholysis degree;(2)adding NH 3·H 2O and NH 4HCO 3 to the polymerization composition;and (3)adding terminator when pressure reduces to 0.15~0.20 MPa (with conversion ≤85%) to terminate polymerization reaction.After modification,the surface structure of PVC resin particle is improved,the residual VCM content in PVC resin reduces to less than 5 ppm,meeting the requirement of non-toxic class resin.

【关键词】 PVC树脂VCM脱吸影响措施
【Key words】 PVC resindesorption of VCMinfluencemeasure
  • 【文献出处】 聚氯乙烯 ,Polyvingyi Chloride , 编辑部邮箱 ,2001年04期
  • 【分类号】TQ325
  • 【被引频次】4
  • 【下载频次】66
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