High-flame-retardant low-smoke-density PBT (polybutylene terephthalate) composite material and preparation method thereof

The invention belongs to the technical field of flame retardant modifiers. The invention provides a high-flame-retardant low-smoke-density PBT (polybutylene terephthalate) composite material and a preparation method thereof. The PBT composite material with high flame retardance and low smoke density comprises the following raw materials in parts by mass: 45-55 parts of polybutylene terephthalate, 20-30 parts of glass fibers, 5-12 parts of inorganic particles, 13-18 parts of a flame retardant, 3-6 parts of a smoke suppressant and 3-6 parts of a nitrogen-containing foaming agent. By reasonably selecting the types of the raw materials and reasonably controlling the dosage and particle size of the raw materials, the obtained PBT composite material has high nitrogen, carbon and phosphorus contents, good synergistic flame retardant effect and mechanical properties, and significantly reduced smoke density. 本发明属于阻燃改性剂技术领域。本发明提供了一种高阻燃低烟密度PBT复合材料及其制备方法。高阻燃低烟密度PBT复合材料，包含如下质量份的原料：聚对苯二甲酸丁二酯45～55份、玻璃纤维20～30份、无机粒子5～12份、阻燃剂1