丁炔二醇醚改性有机硅消泡剂的制备及性能表征

Synthesis and Characterization of Butynediol-ethoxylate Modified Polysiloxanes Defoamer

关键词:  有机硅  丁炔二醇醚  表面活性剂  消泡剂

Key Words:silicone  butynyldiol ether  surfactant  defoamer

摘要:本研究利用丁炔二醇二乙氧基醚（BEO）对含氢聚硅氧烷（LPMHS）进行氢化硅烷化反应，制得具有消泡和抑泡性能的丁炔二醇醚改性有机硅（PSi-EO）表面活性剂，并将其与硅膏和硅树脂进行复配，在Span/Tween复合乳化剂的乳化作用下，经两相转化法制得PSi-EO消泡剂。该消泡剂制备的最佳工艺条件为：PSi-EO添加量4%，复合乳化剂为Span60/Tween60，乳化剂亲水亲油平衡值=10，乳化剂添加量6%。自制消泡剂乳液的消泡时间12 s，相较于市售聚醚改性有机硅消泡剂（消泡时间22 s），具有更强的消泡能力。PSi-EO在消泡剂制备中具有助乳化和降低表面张力的作用，添加PSi-EO的消泡剂乳液乳化程度提高、表面张力降低，且在造纸涂料的应用中具有更低的润湿缺陷。

Abstract:In this study， 1，4-bis(2-hydroxyethoxy)-2-butyne （BEO） was used to hydrosilylate hydrogenated polysiloxane （LPMHS） to produce butynyldiol ether modified silicone （PSi-EO） surfactant with defoaming and foam inhibition properties， and compounded with silicone paste and silicone resin， then the butynyldiol ether modified silicone defoamer was produced by two-phase conversion method under the emulsification of Span/Tween compound emulsifier. The optimal process conditions for the preparation of the defoamer were PSi-EO dosage of 4%， the compound emulsifier of Span60/Tween60， the hydrophilic lipophilic balance value of the emulsifier = 10， and the emulsifier dosage of 6%. Compared with the commercially available polyether-modified silicone defoamer （defoaming time of 22 s）， the homemade defoamer emulsion had stronger defoaming ability and defoaming time of 12 s. In addition， PSi-EO had the functions of emulsification aid and surface tension reduction in defoamer preparation， the defoamer emulsion with PSi-EO addition could improve emulsification level， reduce surface tension， and diminish wetting defects in paper coating application.