为了增强聚醚改性三硅氧烷的亲水性和耐酸碱性能,本研究优化其反应条件,探讨双聚醚的比例对聚醚改性三硅氧烷的性能的影响.结果表明双聚醚成功接枝到三硅氧烷上,反应条件优化结果为双聚醚与三硅氧烷的比例1.1∶1、反应温度105℃、反应时间5 h、催化剂用量0.0020％,三硅氧烷的转化率为95％.合成的双聚醚共改性三硅氧烷表面活性剂具有低的表面张力,在碱性条件下能够稳定使用;其水溶液的表面张力值达19.3 mN·m-1,浊点28℃,在pH 4条件下极易水解,在pH 7和pH 10的环境下能稳定存在30 d.
Synthesis and performance study of bipolyether co-modified trisiloxanesurfactcants
In order to enhance the hydrophilicity and acid-base resistance of the polyether-modified trisi-loxane,this study optimized its reaction conditions and explored the influence of the ratio of the double ether on the properties of the polyether-modified trisiloxane.The results showed that the bis-polyether was successfully grafted onto trisiloxane,and the optimized reaction conditions were as follows:the ratio of polyether to trisiloxane was 1.1∶1,the reaction temperature was 105 ℃,the reaction time was 5 h,and the catalyst dosage was 0.002 0％,and the conversion rate of trisiloxane was 95％.The synthesized bis-polyether co-modified trisiloxane surfactant has low surface tension and can be used stably under alkaline conditions;the surface tension value of its aqueous solution reaches 19.3 mN·m-1,with a turbidity point of 28 ℃,which is easily hydrolyzed under pH 4 and can stably exist for 30 d under pH 7 and pH 10.
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