低粘度自交联氟氢乙烯基硅油的合成及应用
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TQ314

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国家自然科学基金项目(面上项目,重点项目,重大项目)


Synthesis of low viscosity vinyl terminated fluorine-hydrovinyl polysiloxane catalyzed by solid acid
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The National Natural Science Foundation of China (General Program, Key Program, Major Research Plan)

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    摘要:

    采用高活性强酸性阳离子交换树脂(HND-580)催化八甲基环四硅氧烷(D4)、四甲基四氢环四硅氧烷(D4H)和三氟丙基甲基环三硅氧烷(D3F)开环共聚,以四甲基二乙烯基二硅氧烷(D2Vi)为封端剂,制备了低粘度含氟含氢乙烯基硅油。探讨了聚合温度、聚合时间、催化剂用量、催化剂循环等因素对开环共聚反应的影响。通过核磁、红外测试分析共聚物的分子结构;通过热分析法测试共聚物热分解温度;研究结果表明,当聚合温度为60℃、反应时间为4h、催化剂用量为3%~5%时,得到的含氟含氢端乙烯基硅油产率为88.69%,粘度为31mpa?s。将硅油进行涂膜测试,所得水滴静态接触角可达115.2?。

    Abstract:

    Here a convenient method for preparation of low viscosity vinyl terminated fluorine and hydrogen polysiloxanes was explored. Ring-opening copolymerization of octmethylcyclotetrasiloxane (D4), 2,4,6,8-tetramethylcyclotetrasiloxane (D4H) and 1,3,5-tris(3,3,3-trifluoropropyl)methylcyclotrisiloxane (D3F) was firstly catalyzed with highly active strong acidic cation exchange resin (HND-580), and then end-capping was conducted with 1,1,3,3-Tetramethyl-1,3-divinyldisiloxane (D2Vi) to obtain low viscosity vinyl terminated fluorine and hydrogen polysiloxanes. The molecular structures of the copolymers were characterized by FT-IR and 1H-NMR spectroscopy. The thermal properties of the copolymers were measured by TGA. The influences of catalyst dosage, polymerization time, polymerization temperature and number of catalyst cycleson on the polymerization were studied. The results exhibited that when catalyst dosage was 5 wt% of the amount of reactant, polymerization temperature was 60℃ and its time was 6 h, the yield of the product obtained was 88.69% and the viscosity was 31 mPa?s. The contact Angle of the silicone oil can reach 115.2?.

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李辉,邱祖民.低粘度自交联氟氢乙烯基硅油的合成及应用[J].精细化工,2021,38(12):0

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  • 收稿日期:2021-03-29
  • 最后修改日期:2021-07-18
  • 录用日期:2021-07-23
  • 在线发布日期: 2021-10-08
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