工艺技术

席夫碱抑制剂对液体硅橡胶浸渍涂层交联过程控制的研究

  • 刘 超 ,
  • 姚成强 ,
  • 丁 瑶 ,
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  • 1. 合肥工业大学化学与化工学院,先进功能材料与器件安徽省重点实验室,合肥230009;

    2. 安徽太平洋电缆股份有限公司,安徽无为238331;

    3. 佛山市方普防护技术有限公司,广东佛山528313

刘超(1988—),男,博士,实验师,主要研究方向为含硅高分子材料共混与复合。 
尹昊琰( 1993—),男,博士,讲师,主要研究方向为高分子材料高效绿色合成方法;邮箱: yinhaoyan@hfut.edu.cn。

网络出版日期: 2025-10-15

基金资助

国家自然科学基金 -广东省联合基金重点基金项目(U2001223);安徽省自然科学基金项目面上项目(2408085MB038)


Schiff-base Inhibitors for Crosslinking Control in Liquid Silicone Rubber Dip-coating Process

  • LIU C ,
  • YAO C Q ,
  • DING Y ,
  • et al
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  • 1. College of Chemistry and Chemical Engineering,Hefei University of Technology,Anhui Key Laboratory of Advanced

    Functional Materials and Devices,Hefei 230009,China;

    2. Anhui Pacific Cable Co., Ltd., Wuwei,Anhui 238331,China;

    3. Foshan Fangpu Dipping Technology Co., Ltd., Foshan,Guangdong 528313,China

Online published: 2025-10-15

摘要

【目的】针对传统抑制剂在加成型硅橡胶高温下浸渍涂层工艺中易失效的技术瓶颈,开发具有宽温域且适用性优的新型抑制体系。【方法】选用炔醇类抑制剂 In-1和具有双齿配体结构的席夫碱抑制剂 In-2~In-7,比较其在液体硅橡胶催化交联过程中的抑制效果,系统研究席夫碱中配位原子种类和取代基对抑制性能的影响,并从 80 ℃下胶料的贮存稳定性、一定硫化温度下的硫化时间以及制品溶胀与力学性能这 3个方面评估不同抑制剂体系的综合性能。【结果】 N^N型席夫碱抑制剂 In-4展现最优抑制效果,相比 In-1,80 ℃下胶料贮存时间从 2h提升到 6h;胶料在优化的硫化温度( 200 ℃)下,添加 0. 10 mmol In-4,获得的硅橡胶制品的拉伸强度为 3. 34 MPa,断裂伸长率为 317%,综合性能较好;在浸渍涂布工艺中,浸渍 60 s即可获得 0. 57 mm厚的功能涂层,满足大多数应用场景的涂层厚度要求。【结论】在 80 ℃下, In-4仍能有效抑制液体硅橡胶的加成交联反应,提高了胶料在使用过程中的稳定性,在硅橡胶浸渍涂层工艺中具有较好的潜在应用价值。系统的研究为高性能硅橡胶制品的工业化生产提供了重要的工艺参数指导。

本文引用格式

刘 超 , 姚成强 , 丁 瑶 , . 席夫碱抑制剂对液体硅橡胶浸渍涂层交联过程控制的研究[J]. 涂料工业, 2025 , 55(11) : 21 -28 . DOI: 10.12020/j.issn.0253-4312.2025-201

Abstract

[Objective]To solve the failure of conventional inhibitor at high-temperature duringthe curing addition silicone rubber by dip-coating processes,this study aimed to develop a novel crosslinking inhibitor with broad temperature adaptability.[Methods] The inhibition effects of bidentate Schiff-base inhibitors(In-2 to In-7)were comparatively investigated and compared with the commonly used acetylene alcohol inhibitor(In-1) in the liquid silicone rubber curing process. A systematic evaluation of coordination atom types(N^N,N^O,N^S)and substituent effects on inhibition performance was conducted through storage stability at 80 ℃,curing time at vulcanization temperature, swelling properties and mechanical properties of cured products.[Results]The N^N type Schiff-base inhibitor In-4 demonstrated optimal performance,extending the storage time at 80 ℃ from 2 h to 6 hwhile maintaining superior mechanical properties with the tensile strength and elongation at breakbeing 3. 34 MPa,317% respectively,at 0. 10 mmol loading. A functional coating with 0. 57 mmthickness was easily achieved by dip-coating for 60 seconds and met most requirements.[Conclusion] The In-4 inhibitor suppressed effectively the hydrosilylation reaction at 80 ℃,and improved significantly in processing stability. The results above showed great potential applications in dip-coating field. The systematic studies also provided crucial process parameters for high-performancesilicone rubber production.
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