Journal of South China University of Technology (Natural Science Edition) ›› 2007, Vol. 35 ›› Issue (4): 82-85,90.

• Chemistry & Chemical Engineering • Previous Articles     Next Articles

Investigation into Supercritical CO2 /Polystyrene Single-PhaseSolution in Extrusion Foaming

Wu Xiao-dan  Peng Yu-cheng  Cai Ye-bin   

  1. School of lndustrial Equipment and Control Engineering , South China Univ. of Tech. , Guangzhou 510640 , Guangdong , China
  • Received:2006-02-21 Online:2007-04-25 Published:2007-04-25
  • Contact: 吴晓丹(1960-)，男，在职博士生，广东技术师范学院副教授，主要从事塑料机械、模具和刀具等方面的研究. E-mail:w88888xd@126.com
  • About author:吴晓丹(1960-)，男，在职博士生，广东技术师范学院副教授，主要从事塑料机械、模具和刀具等方面的研究.
  • Supported by:

    国家自然科学基金资助项目(10172074) ;广东省自然科学基金资助项目(04011554 )

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Abstract:

In order to obtain microcellular plastic , the factors that affect the formation of supercritical dioxide/poly-styrene single-phase solution in extrusion foaming were investigated. The effects of the position of gas injection , the screw structure , the system temperature and pressure on the single-phase solution were then discussed. Experimen-tal results indicate that (1) the position of gas injection in the axial direction seriously affects the stability of gas in-jection , (2) more ports in the radial direction and low gas temperature help to form high-quality single-phase solu-tion , (3) the quality of the single-phase solution decrease with the increase in the rotational speed of screw , and ( 4) higher pressure and lower temperature of the solution is helpful to the ensurence of single-phase solution pro-duct quality. Also , the ideal conditions for the formation of high-quality single-phase solution of supercritical di-oxide/polystyrene in extrusion foaming were presented in this paper.

Key words: supercritical CO2, polystyrene, single-phase solution, extrusion foaming, solubility, screw, pressure, temperature