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<p>Boron-modified MQ silicone resin (B-MQ) was successfully prepared as a new flux using boric acid (BA) modified vinyl MQ silicone resin. The B-MQ was mixed with silicone rubber (VMQ, vinyl methyl silicone rubber) and other fillers to prepare ceramicised silicone rubber composites with different ratios of B-MQ and VMQ. The experimental results show that the initial decomposition temperature of MQ silicone resin is 203 ℃, and the decomposition temperature of modified B-MQ silicone resin is increased to 255 ℃. The addition of B-MQ can effectively improve the thermal stability, tensile strength, hardness, the flame-retardant level (e.g., composites with 6 and 9 phr B-MQ: V-0) and the LOI of the composites. After calcination, the ceramic residue with 6 phr B-MQ displays a dense structure and high ceramic strength (e.g., calcinated at 1000&#xa0;°C: 21.5&#xa0;MPa). The caramelisation mechanism for fire-resistant silicone rubber was revealed. The SiO<sub>2</sub> generated by the decomposition of silicone rubber undergoes complex eutectic reactions through the liquid phase formed by B-MQ melting and the porcelain filler, leading to a greater degree of improvement in the mechanical strength of the ceramic residue. This work provides a new idea for preparing silicone composites with high fire resistance and ceramic strength.</p>

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Preparation and properties of ceramizable fireproof silicon rubber composites based on boron-modified MQ silicone resin

  • 期刊论文

  • 发表日期：

    2026年4月27日

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  • Xiao Lu,
  • Yongqing Zhao,
  • Wenjie Ye,
  • Mengyang Sun,
  • Ruiqi Sha,
  • Yaoxin Shao,
  • Wenge Zheng,
  • Linqiong Xu

摘要

Boron-modified MQ silicone resin (B-MQ) was successfully prepared as a new flux using boric acid (BA) modified vinyl MQ silicone resin. The B-MQ was mixed with silicone rubber (VMQ, vinyl methyl silicone rubber) and other fillers to prepare ceramicised silicone rubber composites with different ratios of B-MQ and VMQ. The experimental results show that the initial decomposition temperature of MQ silicone resin is 203 ℃, and the decomposition temperature of modified B-MQ silicone resin is increased to 255 ℃. The addition of B-MQ can effectively improve the thermal stability, tensile strength, hardness, the flame-retardant level (e.g., composites with 6 and 9 phr B-MQ: V-0) and the LOI of the composites. After calcination, the ceramic residue with 6 phr B-MQ displays a dense structure and high ceramic strength (e.g., calcinated at 1000 °C: 21.5 MPa). The caramelisation mechanism for fire-resistant silicone rubber was revealed. The SiO2 generated by the decomposition of silicone rubber undergoes complex eutectic reactions through the liquid phase formed by B-MQ melting and the porcelain filler, leading to a greater degree of improvement in the mechanical strength of the ceramic residue. This work provides a new idea for preparing silicone composites with high fire resistance and ceramic strength.