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| Synthesis and Characterization of Butynediol-ethoxylate Modified Polysiloxanes Defoamer |
| Received:May 12, 2023 |
| DOI：10.11980/j.issn.0254-508X.2023.10.010 |
| Key Words:silicone butynyldiol ether surfactant defoamer |
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| 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. |
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