一种新型有机硅消泡剂合成与应用研究

以烯丙醇聚氧乙烯聚氧丙烯醚(FB)、长链烷基酯与含氢硅油(PHMS)通过Si-H加成反应，合成了有机硅高聚物（改性硅油），用IR和1HNMR对其结构进行了表征。将改性硅油作为活性成分，制备了有机硅消泡剂。探讨了长链烷基酯链段长短对其稳定性、表面张力、消抑泡性能的影响。结果表明：甲基丙烯酸十四烷基酯与烯丙醇聚醚共改性硅油所制消泡剂稳定性强，粒径分布最均匀，主要集中在260 nm处，消抑泡效果最优，其在质量分数为5%的十二烷基苯磺酸钠溶液中消泡时间为6 s，在质量分数为5%洗衣粉溶液中消泡时间为4 s，在黑液溶液中（质量分数为30%木质素）消泡时间为12 s，消抑泡性能优于国内（RX-504）与德国（850E）消泡剂产品。

Synthesis and Application of a New Type of Organic Silicone Defoamer

The organosilicon high polymers(modified silicone oil) were synthesized by using allyl alcohol polyoxyethylene polyoxypropylene ether (FB), long-chain alkyl esters and hydrogen silicone hydrosilation(PHMS) addition change. And using by infrared spectrum and nuclear magnetic resonancespectrum of its structures have been characterized . A silicone defoamer was prepared with the organosilicon high polymer as active ingredient. It is discussed on the stability , surface tension, defoaming performance of the long -chain alkyl ester segment of its length . The results show that the defoamer performs the most stability, the most uniform particle size distribution and optimal application performance when synthetized with methacrylate tetradecyl methacrylate and allyl alcohol polyether modified silicone oil. The particle size of the defoamer mainly spread in 260 nm. The defoaming time of the defoamer is 6 s, 4 s, 12 s respectively when it is in 5% mass fraction dodecyl sodium solution, 5% detergent solution and black liquor (30% lignin). The defoamer shows better property than RX-504 and 850E coming from .China and Germany.