磷杂菲基共聚协效阻燃聚酰胺6纤维的制备及其性能

为提高聚酰胺6(PA6)纤维的阻燃性能,以10-(2,5-二羧基苯氧基)-10-氢-9-氧杂-10-磷杂菲-10-氧化物(DOPODP)为共聚阻燃剂,复配二硫化钼(MoS₂)或硫化锌(ZnS),制备DOPODP共聚协效阻燃PA6,经熔融纺丝制备阻燃PA6纤维,并对其结构、性能及阻燃机制进行研究。结果表明:DOPODP经共聚法成功引入PA6,DOPODP可提高PA6的阻燃性能,但其熔融温度、结晶温度等下降;引入协效阻燃剂后,阻燃PA6垂直燃烧(UL94)级别为V-0级,极限氧指数(LOI值)达30%以上;DOPODP对PA6主要表现为气相阻燃作用,DOPODP分解产生含磷自由基可捕获活性自由基,协效阻燃剂可促进PA6成炭;相比PA6纤维,阻燃PA6纤维力学性能下降,而织物的LOI值提高。

Preparation and properties of synergistic flame retardant copolyamide 6 fiber with phosphaphenanthrene group

In order to improve the flame retardancy of polyamide 6 (PA6) fibers,a flame retardant was synthesized by copolymerization with 10-(2,5-dicarboxyl phenoxyl)-9,10-dihydro-9-oxa-10-phosphaphenanthrene-10-oxide (DOPODP) and combination of molybdenum disulfide (MoS₂) or zinc sulfide (ZnS), the flame retardant PA6 fibers were prepared via melt spinning. The structure, properties, and the flame-retardant mechanism of the co-PA6 and its fibers were also studied. The results show that the DOPODP had been introduced into PA6 molecular chains, the flame retardancy of the copolymer was improved, but the melting temperature and crystallization temperature were reduced. The synergistic flame retardant PA6 achieved a V-0 rating according to the UL94 criterion with an LOI value greater than 30%. The study of the flame-retardant mechanism indicated that the DOPODP in PA6 mainly take effects in gas phase, DOPODP could decompose to phosphorus radicals. In addition, with the introduction of synergistic flame retardants, the char content of flame retardant PA6 was increased. Compared with PA6 fiber, the mechanical properties of flame retardant PA6 fibers were decreased, and the LOI value of the fabrics increased.