高等学校化学学报

高等学校化学学报

• 研究论文 • 上一篇    下一篇

CO2对硅酸钠-丙烯酰胺溶液聚合行为及产物性质的影响

赵仁保   

  1. 中国石油大学(北京)石油工程教育部重点实验室, 提高采收率研究中心, 北京 102249
  • 收稿日期:2008-10-02 修回日期:1900-01-01 出版日期:2009-03-10 发布日期:2009-03-10
  • 通讯作者: 赵仁保

Influence of Carbon Dioxide on the Polymerization Behavior of Sodium Silicate-acrylamide Solution and Products Properties

ZHAO Ren-Bao   

  1. Key Laboratory of Petroleum Engineering, Ministry of Education, Enhanced Oil Recovering Research Center, China University of Petroleum, Beijing 102249, China
  • Received:2008-10-02 Revised:1900-01-01 Online:2009-03-10 Published:2009-03-10
  • Contact: ZHAO Ren-Bao

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摘要： 研究了不同CO2分压下低浓度丙烯酰胺(AM)在硅酸钠溶液中的聚合反应行为, 用环境扫描电子显微镜、流变仪及激光粒度仪等研究了产物的微观结构及其流变特性. 结果表明, 随着CO2浓度的增加, 产物的储能模量增加, 即黏弹性增大; 反应后生成的硅酸凝胶镶嵌在聚丙烯酰胺高分子凝胶网格中形成了复杂的网状结构. 在超声波作用下, 硅酸凝胶颗粒从体系中脱离, 检测到的颗粒粒径范围在280~900 nm之间, 且随着超声时间的增加, 颗粒的平均粒径减小. 结果表明, CO2的存在使得AM及交联剂的分子扩散速度增加, 提高了AM分子之间及其与交联剂分子的接触几率, 从而提高了产物的分子量.

关键词: 二氧化碳, 地质埋存, 丙烯酰胺, 硅酸钠, 复合凝胶

Abstract: The polymerization behavior of acrylamide at its low concentration in sodium silicate solution under different pressure of carbon dioxide was studied. The microstructure and rheological properties of the synthetic products were characterized by environmental scanning electron microscope(ESEM), rheometer and laser particle sizer. A mixture is produced in experiments and will have larger storage modulus or viscoelasticity at a higher CO2 concentration. It has a complex network structure formed by silicic acid gel embedded into polyacrylamide gel. After detaching from the mixture when exposed to ultrasonic wave, the silicate granules have a particle size distribution range of 280—900 nm, and their average size becomes smaller with the increase of exposure time. The mechanisms is that carbon dioxide helps increase both the diffusion velocity of AM molecule and also contact chance among the AM and initiator and crosslinking agent, which could enhance the molecule weight of the products.

Key words: Carbon dioxide, Geological sequestration, Acrylamide, Sodium silicate, Composite gel

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