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以Mg(OH)2为无机阻燃剂,以苯并噁嗪(BZ)-环氧树脂(EP)为基体,通过热压成型制得Mg(OH)2-玻纤布/BZ-EP层压板。通过垂直燃烧和极限氧指数测试层压板的阻燃性,分析了Mg(OH)2粉体的用量、粒径及不同粒径粉体复合添加对复合材料阻燃性的影响,通过SEM对Mg(OH)2粉体在浸渍胶中的分散结构进行表征。研究发现:Mg(OH)2粉体的粒径和用量对板材阻燃性有一定影响,不同粒径的粉体混合添加可以在复合材料中形成阻燃网络,达到最佳的阻燃效果,同时可以减小无机粒子对板材力学和电学性能的影响。当阻燃剂Mg(OH)2用量为BZ-EP总质量的30wt%,粒径为2μm的粉体(YX-105)和粒径为4μm(YX-110)的粉体以质量比1∶2复合添加时,所制层压板的极限氧指数为34%,垂直燃烧单个试样自熄时间最短为7.52s,5个试样总自熄时间为49.81s,达到UL-94V-0级标准。复合材料的弯曲强度为399.84MPa,相对介电常数为3.848。
Mg (OH) 2-glass fiber cloth / BZ-EP layer was prepared by thermoforming with Mg (OH) 2 as inorganic flame retardant and benzoxazine (BZ) Platen. The flame retardancy of the laminate was tested by vertical combustion and limiting oxygen index. The effects of the amount of Mg (OH) 2 powder, particle size and the composite addition of different particle size powders on the flame retardancy of the composites were analyzed. SEM, (OH) 2 powder in the impregnated gel dispersed structure characterization. The results show that the particle size and dosage of Mg (OH) 2 powder have certain influence on the flame retardancy of the plate, and the mixture of different particle sizes can form the flame retardant network in the composite material to achieve the best flame retardant effect. At the same time, the influence of inorganic particles on the mechanical and electrical properties of the sheet can be reduced. When the amount of flame retardant Mg (OH) 2 is 30wt% of the total mass of BZ-EP, the powder with particle size of 2μm (YX-105) and the powder with particle size of 4μm (YX-110) 2 composites, the limit oxygen index of the laminate was 34%, the self-extinguishing time of a single vertical burning sample was 7.52s, the total self-extinguishing time of the five samples was 49.81s, which reached UL-94V-0 standard . The flexural strength of the composites was 399.84 MPa and the relative dielectric constant was 3.848.