摘要
采用含溴阻燃剂或氮磷膨胀阻燃剂(IFR)、复合抗氧剂、光稳定剂和紫外线吸收剂制备了一种耐紫外高灼热丝阻燃聚丙烯材料,研究了不同阻燃剂对聚丙烯阻燃性能及紫外老化性能的影响,在优选阻燃剂的基础上,比较了不同抗紫外老化助剂对材料紫外老化性能的影响,最后评价了最优配方体系下材料紫外加速老化后的性能衰减状况。结果表明,相同阻燃剂添加量下无卤IFR更易使材料通过灼热丝起燃温度850℃试验且无火焰产生,UL 94阻燃等级达到V–0级,同时紫外老化后的色差变化较小;自制高成炭无卤阻燃剂IFR–S因较好的成炭作用,达到同样效果,添加量可以降低3份;在相同抗氧剂体系下,含卤阻燃体系紫外加速老化28 d后的色差是无卤膨胀阻燃体系的三倍左右;三嗪类及苯并三氮唑类紫外线吸收剂可以明显改善材料紫外老化时的色变状况,同时降低了聚丙烯的降解程度;通过添加IFR–S、低碱性复合抗氧剂、苯甲酸酯类光稳定剂和苯并三氮唑类紫外线吸收剂制备的阻燃聚丙烯材料经过28 d紫外加速老化,拉伸强度下降1 MPa,缺口冲击强度下降3 J/m,阻燃性能未改变。
Brominated flame retardant or nitrogen phosphorus intumescent flame retardant(IFR),compound antioxidant,light stabilizer,UV absorbers were used to prepare a kind of anti-ultraviolet high glow wire flame retardant polypropylene materials.The effects of different flame retardant systems on the flame retardancy and UV aging performances of polypropylene were studied.Based on the optimal flame retardant,the ultraviolet aging effects of different anti-ultraviolet additives on the materials were compared,finally,the performance degradation status of the material with optimal recipe system after UV acceleration aging was evaluated.The results show that,under same flame retardant content,the materials with halogen-free IFR are more suitable for passing the glow wire ignition temperature(GWIT)850℃test without flame and their UL 94 flame retardant grade reach V–0(1.6 mm).For achieving same effects,the content of self-made high-carbonized flame retardant IFR–S can be reduced by 3 phr due to its good char formation effect.ΔE of halogen-containing system is about three times more than that of halogen-free intumescent systems after 28 d ultraviolet acceleration aging under same antioxidant system.Triazine and benzotriazole UV absorbers can greatly improve the color change and decrease degradation rate of polypropylene under UV acceleration.After 28 d ultraviolet accelerated aging,the tensile strength of the flame retardant polypropylene material prepared by adding IFR–S,low alkalinity compound antioxidant,benzoate light stabilizer and benzotriazole UV absorber is decreased by about 1 MPa,the impact strength is decreased by about 3 J/m,no reduction occurs in flame retardancy.
作者
陈超
金晶
陈东
Chen Chao;Jin Jing;Chen Dong(Shanghai Sunny Technology Co.Ltd.,Shanghai 201109,China)
出处
《工程塑料应用》
CAS
CSCD
北大核心
2020年第5期52-56,共5页
Engineering Plastics Application
关键词
阻燃
聚丙烯
紫外老化
灼热丝
灼热丝起燃温度
flame retardant
polypropylene
UV aging
glow wire
glow wire ignition temperature
