Technology

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

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.

Cite this article

LIU C , YAO C Q , DING Y , et al . Schiff-base Inhibitors for Crosslinking Control in Liquid Silicone Rubber Dip-coating Process[J]. Paint & Coatings Industry, 2025 , 55(11) : 21 -28 . DOI: 10.12020/j.issn.0253-4312.2025-201

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