HIPS阻燃复合材料三元潜在火灾危险性评价

将高抗冲聚苯乙烯树脂颗粒(纳米/微米级)、十溴二苯乙烷颗粒、三氧化二锑、弹性体、分散剂和偶联剂通过一步熔融共混工艺先行制备UL94 V-0级阻燃母粒,再将其与HIPS本体树脂按不同比例混合制得阻燃复合材料,并利用极限氧指数(LOI)、垂直燃烧(UL94)及ISO 5660锥形量热计三项测试表征制得样品的燃烧和火灾性能,从中提炼和分析LOI、垂直燃烧等级和最大热释放速率(Pk HRR)等三元关键指标相关性,给出了定性定量相结合的潜在火灾危险性分级范围。结果表明:UL94燃烧等级和Pk HRR相关性体现为当Pk HRR≤330.0 k W/m~2时,试样UL94等级均为V-0级;UL94燃烧等级和LOI相关性体现为随UL94燃烧等级从V-0降到HB时,试样LOI从27.0降到17.0;Pk HRR与LOI相关性体现为Pk HRR与LOI呈粗略反向线性相关性;UL94燃烧等级、Pk HRR和LOI三元相关性体现为当LOI22.0、Pk HRR为399.0~665.0 k W/m~2时,材料UL94燃烧等级介于HB~V-2。

3-D potential fire hazard assessment of the high impact polystyrene burst-resistant composites

The article is to provide with a 3-D potential fire hazard assessment for the high impact polystyrene combustion-retardant composites LOI (Limiting Oxygen Index).For the said purpose,we have done the UL94 vertical burning and ISO 5660 cone calorimeter tests to characterize the combustion and the fire reaction and resistant properties of the prescribed flame retardant High Impact Polystyrene(HIPS) composites at different levels of flammability.At the same time,we have also prepared and self-developed the flame retardant HIPS master-batch (FMB) by means of the meh-blending HIPS(bulk resin,82.0 wt.％),decabrominated dipheny ethane(DBDPE,flame retardant,10.0 wt.％),antimony oxide (AO,flame retardant synergist,4.0 wt.％),elastomer(POE,3.0 wt.％),dispersant (EBS,1.0 wt.％) and coupling agent(TAIC,0.1 wt.％).It has also to point out that we have further gained the designated composites by a single step melt blending of HIPS bulk resins(BR) with the above mentioned master-batch at the different mass ratios between (1.0-8.0):1.0.At the same time,the effective parameters can be abstracted based on the study of the UL94V,LOI and the cone calorimeter.We have established the ternary relationships among the various vertical fire ratings,Peak Heat Release Rate (PkHRR) and LOI ratings,which constitute a three-dimensional potential fire hazards assessment system combined both qualitatively and quantitatively.Thus,the system can help to give us a new thinking line to achieve an approach to the warranty of safety,health and environment-friendly properties of the nanosized materials.It is just for this purpose that we have done the LOI and cone calorimeter tests and associated the multi-standard potential fire risk assessment with the testing results of UL94 vertical burning materials.The final results we have gained indicate that the UL94 ratings and PkHRR prove to be in a nice correlation,that is to say,when PkHRR≤ 300.0 kW/m2,the UL94 rate of the sample is equal to V-0.With the UL94 rating range goes to from V-0 to HB,the actual data of LOI would decline from 27.0 to 17.0.And,simultaneously,PkHRR and LOI tend to be in a roughly reverse linear relation.The ternary linear correlation of UL94 ratings,LOI and PkHRR can be rephrased as:when LOI ＜ 22.0 and 399.0 kW/m2 ＜ PkHRR ＜ 665.0 kW/m2,the UL94 rating tends to range from HB-V-2,in which,the sample of the case study should be entitled with huge potential fire hazard,especially in the regard to the thermal damage.