Nitrogen-Enriched Phenolic Microspheres as Flame Retardant for Organic Silicone Rubber and Its Mechanism

被引：0

作者：

Dong W. ^{[1
]}

Dou Y. ^{[2
]}

Liu L. ^{[2
]}

Ren Z. ^{[2
]}

Xu B. ^{[2
]}

Wu K. ^{[1
]}

Cao J. ^{[1
]}

Long D. ^{[1
]}

机构：

[1] School of Chemical Engineering, East China University of Science and Technology (ECUST), Shanghai

[2] Shanghai Electro-Mechanical Engineering Institute, Shanghai

来源：

Gaofenzi Cailiao Kexue Yu Gongcheng/Polymeric Materials Science and Engineering | 2021年 / 37卷 / 11期

关键词：

Flame retardant; Melamine; Phenolic microsphere; Silicone rubber;

D O I：

10.16865/j.cnki.1000-7555.2021.0272

中图分类号：

学科分类号：

摘要：

Monodisperse nitrogen-enriched phenolic microspheres were synthesized by hydrothermal method using melamine, resorcinol and formaldehyde as raw material, and used as filler for methyl phenyl silicone rubber. The tensile properties, flame retardant properties and high temperature stability of the silicone rubbers were studied. The results of cone calorimetry and limiting oxygen index (LOI) tests show that the addition of nitrogen-enriched phenolic microspheres (40 phr) significantly improves the flame retardant of silicone rubbers. The peak heat release rate is reduced from 220 kW/m2 to 125 kW/m2 and the LOI is improved from 21.11% to 28.83%, indicating the excellent flame retardant function of nitrogen-enriched microspheres. Thermogravimetric-infrared, pyrolysis gas chromatography mass/spectrometry and morphology analysis indicate that the nitrogen-enriched phenolic microspheres improve the flame retardancy of silicone rubbers by releasing melamine and ammonia in gas phase and maintaining the volume and shape of silicone rubber in solid phase. The tensile test, high temperature carbonization test and SEM reveal that nitrogen-enriched phenolic microspheres have the good compatibility with silicone rubber, improve the tensile strength of the rubber from 0.24 MPa to 0.74 MPa while maintaining its elongation at break at 110%, and increase the structural integrity of the product after carbonization, so have certain potential applications in ablative silicone rubber heat resistance coating. © 2021, Editorial Board of Polymer Materials Science & Engineering. All right reserved.

引用

页码：53 / 61

页数：8

共 13 条

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