顶空气相色谱法测定苯丙乳液中残余单体含量

Detection of the Residual Monomers in Phenylpropyl Latexes by Headspace Gas Chromatography

首先建立了顶空气相色谱法(HSGC)准确测定胶乳中的残留单体,通过调节苯丙乳液聚合工艺制备出残余单体的浓度在1%(质量分数)以下的苯丙胶乳;然后采用后氧化还原聚合工艺,研究后氧化聚合引发体系及用量对乳胶残余单体浓度的影响,结果可将胶乳中残余单体的浓度降低到100×10-6以下;最后采用残余单体转化方法进一步降低乳胶中残留单体的浓度至20×10-6以下,为制备"绿色"内墙涂料奠定了基础。

The headspace gas chromatography was firstly used to determine the residual monomers in latexes accurately. The phenylpropyl latexes with the residual monomer concentration low than 1wt% are prepared by regulating the emulsion polymerization technique; the influences of post oxidation-reduction initiator system and concentration on the residual monomer concentration of latexes are investigated,the result indicating that the residual monomer concentration can be decreased to 100×10-6; lastly the residual monomers transformation method are used to lower the residual monomers to below 20×10-6,laying the foundation for preparing interior wall green coatings.