Yang Liu, Hai-Bo Zhu, Ke Shang, Bi Zhao, Gui-De Lin, Jun-Sheng Wang, Jin-Jun Yang
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引用次数: 0
摘要
本研究成功制备了不同种类的硅烷偶联剂改性膨胀石墨(MEG)填料,并将其加入硅橡胶基体中制成阻燃复合材料(SR/MEG)。加入硅氧烷链的 MEG 填料与硅橡胶基体具有良好的相容性,不仅降低了添加填料对机械性能的负面影响,还赋予了硅橡胶复合材料理想的阻燃性能。随后,在 SR/MEG 复合材料中加入铂(Pt)催化剂,制备出 SR/MEG/Pt 复合材料,并系统研究了 MEG 和铂催化剂对硅橡胶复合材料热稳定性、阻燃性和燃烧行为的协同作用。由于在铂催化剂的催化下形成了膨胀致密的硅碳保护层,适当添加 MEG 和铂催化剂的目标 SR/MEG/Pt 复合材料可获得较高的炭残留量(41.9%)和极限氧指数(29.6%),并在垂直燃烧试验中达到 V-0 级。此外,锥形量热仪测试结果表明,添加适量铂催化剂后,SR/MEG 复合材料的放热速率峰值和总放热量进一步降低,表明 MEG 和铂催化剂对硅橡胶阻燃性能具有良好的协同作用。本文提出的方法为制造高性能阻燃硅橡胶材料提供了一种可行的途径。
Synergistic flame-retardant effects between silane coupling agents modified expanded graphite and Pt catalyst in silicone rubber composites
In this work, different kinds of silane coupling agents modified expanded graphite (MEG) fillers were successfully prepared and then incorporated into silicon rubber matrix to fabricate flame-retardant composite materials (SR/MEG). The inserted MEG fillers with siloxane chains exhibited good compatibility with the silicon rubber matrix, which cannot only reduce the negative impact of adding fillers on mechanical properties but also endow the silicon rubber composites with ideal flame retardancy. Subsequently, platinum (Pt) catalyst was incorporated into the SR/MEG composites to prepare SR/MEG/Pt composites, and the synergistic effects of MEG and Pt catalyst on the thermal stability, flame retardancy, and combustion behavior of silicon rubber composites were systematically investigated. The target SR/MEG/Pt composite with appropriate addition of MEG and Pt catalyst can obtain relatively high char residue of 41.9% and limiting oxygen index value of 29.6%, as well as achieve V-0 rating in the vertical combustion test, owing to the formation of expanded and dense silicon–carbon protective layer under the catalysis of Pt catalyst. Moreover, the cone calorimeter test results showed that the peak of heat release rate and total heat release of SR/MEG composites were further reduced after the addition of an appropriate amount of Pt catalyst, manifesting the good synergistic effect of MEG and Pt catalyst on the flame retardancy performance of silicon rubber. The method proposed herein may provide a promising way for fabricating high-performance flame-retardant silicone rubber materials.
期刊介绍:
Fire and Materials is an international journal for scientific and technological communications directed at the fire properties of materials and the products into which they are made. This covers all aspects of the polymer field and the end uses where polymers find application; the important developments in the fields of natural products - wood and cellulosics; non-polymeric materials - metals and ceramics; as well as the chemistry and industrial applications of fire retardant chemicals.
Contributions will be particularly welcomed on heat release; properties of combustion products - smoke opacity, toxicity and corrosivity; modelling and testing.