Synergistically Improving Tracking Resistance of Addition-Cure Liquid Silicone Rubber with Aminepropyltriethoxysilane-Immobilized Silica and Platinum Catalyst

IF 2.8 3区材料科学 Q3 CHEMISTRY, PHYSICAL Silicon Pub Date : 2024-08-10 DOI:10.1007/s12633-024-03108-3

Ye Wei, Yiming Liao, Xuejun Lai, Hongqiang Li, Wanjuan Chen, Xingrong Zeng

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Abstract

The tracking-resistant silicone rubber with superior water resistance is very essential for outdoor high-voltage transmission field. In this work, aminepropyltriethoxysilane-immobilized silica (APTES-SiO₂) was prepared through dehydration condensation between the ethoxy groups of aminepropyltriethoxysilane (APTES) and hydroxyl groups on the SiO₂ surface. The effects of APTES-SiO₂ on the vulcanization, mechanical properties, thermal stability and tracking resistance of addition-cure liquid silicone rubber (ALSR) were studied. The results revealed that APTES-SiO₂ and platinum catalyst (Pt) synergistically improved the tracking resistance of ALSR, and APTES-SiO₂/ALSR also possessed excellent water resistance. When the content of APTES and Pt was 0.15 phr (parts per hundreds of rubber) and 15 ppm (parts per million), respectively, APTES-SiO₂/ALSR reached 1A4.5 level. Furthermore, the tracking resistance of ALSR showed little deterioration even after immersion in water for 30 days. The results of thermogravimetry (TG) and thermogravimetry-Fourier transform infrared spectroscopy (TG-FTIR) indicated that APTES-SiO₂ and Pt synergistically promoted the radical crosslinking of ALSR chains at high temperature, which was favorable to the formation of compact ceramic protected layer, thus significantly improved the tracking resistance of ALSR.

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用胺丙基三乙氧基硅烷固定化白炭黑和铂催化剂协同改善加成硫化液体硅橡胶的抗跟踪性能

具有优异防水性能的耐跟踪硅橡胶对于户外高压输电领域非常重要。本研究通过胺丙基三乙氧基硅烷（APTES）的乙氧基与二氧化硅表面羟基的脱水缩合，制备了胺丙基三乙氧基硅烷固定化二氧化硅（APTES-SiO2）。研究了 APTES-SiO2 对加成硫化液体硅橡胶 (ALSR) 的硫化、机械性能、热稳定性和耐跟踪性的影响。结果表明，APTES-SiO2 和铂催化剂（Pt）能协同改善 ALSR 的耐跟踪性，APTES-SiO2/ALSR 还具有优异的耐水性。当 APTES 和 Pt 的含量分别为 0.15 phr（百分之一）和 15 ppm（百万分之一）时，APTES-SiO2/ALSR 达到了 1A4.5 级。此外，即使在水中浸泡 30 天，ALSR 的耐跟踪性也几乎没有下降。热重分析（TG）和热重分析-傅立叶变换红外光谱（TG-FTIR）的结果表明，APTES-SiO2 和铂在高温下协同促进了 ALSR 链的自由基交联，有利于形成致密的陶瓷保护层，从而显著提高了 ALSR 的耐跟踪性。

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来源期刊

Silicon CHEMISTRY, PHYSICAL-MATERIALS SCIENCE, MULTIDISCIPLINARY

CiteScore

5.90

自引率

20.60%

发文量

685

审稿时长

>12 weeks

期刊介绍： The journal Silicon is intended to serve all those involved in studying the role of silicon as an enabling element in materials science. There are no restrictions on disciplinary boundaries provided the focus is on silicon-based materials or adds significantly to the understanding of such materials. Accordingly, such contributions are welcome in the areas of inorganic and organic chemistry, physics, biology, engineering, nanoscience, environmental science, electronics and optoelectronics, and modeling and theory. Relevant silicon-based materials include, but are not limited to, semiconductors, polymers, composites, ceramics, glasses, coatings, resins, composites, small molecules, and thin films.