Study for Reducement of Polymerization Time and Improvement of Stability in Manufacturing Carboxylated Styrene-butadiene Latex

카르복실화 스티렌-부타디엔 라텍스의 중합시간 단축과 안정성 개선을 위한 연구

  • Cho, Ur-Ryong (Department of Applied Chemical Eng., Korea Univ. of Technology and Education)
  • 조을룡 (한국기술교육대학교 응용화학공학과)
  • Published : 2002.03.31

Abstract

Polymerization of carboxylated styrene-butadiene latex takes longer time than that of acrylic emulsion due to delocalization of radical in butadiene unit having conjugated double bond. A latex stability is the most important properties owing to use intact without separating polymer from base latex. For reducing polymerization time without decreasing any properties of latex, carbon tetra-chloride which has been used as the most popular chain transfer agent was replaced to combination of tert-dodecylmercaptane and ${\alpha}$-methylstyrene dimer. The replacement yielded reducement or 2 hr in polymerization time. In the increment step, charge amount of acrylic acid was limited to 0.3 part to restrain viscosity enhancement. Just after initial step, addition of 0.1 part acrylamide prevent polymer chain from diffusing between two region followed by giving hardness and final good adhesive force to latex particles.

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