Journal of South China University of Technology (Natural Science Edition) ›› 2005, Vol. 33 ›› Issue (10): 98-102,107.

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Particle Size and Alkali-Thickening Characteristics of Styrene/Acrylate Emulsion Containing Carboxyl Groups

Zhang Xin-ya  Shen Hui-fang  Huang Hong  Li Yong-jin  Lan Ren-hua  Chen Huan-qin   

  1. College of Chemical and Energy Engineering,South China Univ.of Tech.,Guangzhou 510640,Guangdong,China
  • Received:2004-12-24 Online:2005-10-25 Published:2005-10-25
  • Contact: 张心亚(1974-)，男，讲师，博士，主要从事乳液聚合及相关产品方面的研究 E-mail:cexyzh@scut.edu.en
  • About author:张心亚(1974-)，男，讲师，博士，主要从事乳液聚合及相关产品方面的研究
  • Supported by:

    广东省科技计划资助项目(2003B10506)

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Abstract:

Styrene/acrylate emulsion was synthesized by merization,with styrene(St),methacrylic acid(MAA) the semi-continuous technique of seeded emulsion poly-or acrylic acid(AA),butylacrylate(BA)and methyl-methacrylate(MMA)as copolymerization monomers.The efects of the aminating temperature.the adding manners and the contents of AA and MAA on the viscosity,the particle size and the carboxyl distribution of the emulsion were then discussed.Moreover,the alkali-thickening mechanism of the emulsion was briefly analyzed. Experimen.tal results show that:(1)at an aminating temperature of 60℃,preferable alkali.thickening effect is obtained.and the particle size is reasonably reduced;(2)different adding manners and adding time of AA and MAA may resuIt in different distributions of carboxyl groups in the emulsion particle as well as different alkali．thickening properties;and(3)the enrichment of carboxyl groups on the surface of emulsion particles can be achieved by a specific poly.merization technique.

Key words: styrene/acrylate emulsion, acrylic acid, methacrylic acid, particle size, alkali thickening