聚醚侧链接枝密度对聚醚硅油性能的影响

Effect on Density of Side Chain Polyether on Properties of Silicone Polyether

通过烯丙基聚醚与含氢硅油的硅氢加成反应制备聚醚硅油。保持含氢硅油摩尔质量基本不变,考察含氢硅油的活性氢质量分数,即聚醚侧链的密度对硅氢加成反应及聚醚硅油性能的影响。结果表明,随着含氢硅油中活性氢质量分数的增加,反应体系变澄清所需要的时间变长;含氢硅油的活性氢质量分数为0.25%时,聚醚硅油的浊点最高;活性氢质量分数为0.2%时,多种浓度的聚醚硅油水溶液均呈现较高的表面张力;同一结构的聚醚硅油水溶液的表面张力随着聚醚硅油浓度的增加快速下降,质量浓度大于0.02 g/L后表面张力下降缓慢。含氢硅油较佳的活性氢质量分数是0.25%,用此含氢硅油制备的聚醚硅油在质量浓度为0.10 g/L时,其水溶液的表面张力下降至44.8 mN/m。

The silicone polyether（SPE） was prepared through hydrosilylation of a polysiloxane and an allyl polyether.The effect of Si-H content or the density of the polyether on the polysiloxane main chain by hydrosilylation reaction and the properties of the resulting silicone polyether products were studied by keeping the molecular weight of the polysiloxane unchanged while varying the Si-H content.The results showed that the time for the reaction system to become clear was prolonged with increasing the Si-H content.The cloud point test results showed that the cloud point of the silicone polyether product was the highest with 0.25 wt% of the H of the polysiloxane.The surface tension of the silicone polyether water solution with several concentrations was the highest with 0.20 wt% of the H of the polysiloxane.The surface tension of the silicone polyether water solution was decreased when the H content of the polysiloxane was above 0.20 wt%.With the same silicone polyether,the surface tension of water solution was decreased with increasing the concentration.The surface tension decreasing trend was leveled off with the H concentration over 0.02 wt%.The surface tension of the silicone polyether water solution reduced to 44.8 mN/m when the mass concentration of the silicone polyether was 0.10 g/L.