| In the wide range of automotive interior materials,to more traditional products such as plastic and so on used in automotive interior parts such as door,roof,fenders and so on, but the plastic products derive from oil,need to consume a large amount of resources and the difficult decomposition after the use of plastic,not easy recovery,these shortcomings so that it can not meet the auto industry and the development of the world's environmental trends.But the raw hemp fiber products because of their high-intensity,high wear resistance,the source wide and easy to degradation of the advantages,gradually is replacing the plastic products in the automotive interior materials.But hemp fiber is flammable fiber,it make hemp apply in the auto industry was limited,so it is necessary to retard flame.This paper studies the flame-retardant finishing which utilizes Mg(OH)2 to automobile upholstery plant substrate of hemp fiber felt,optimizing the finishing process, analyzing the flame-retardant capability of the product in the optimized method by CONE calorimetric analyzer and the flame-retardant mechanism of the flame-retardant hemp fiber felt by thermogravimetric analyzers and differential thermal analyzers,it provides reference to interrelated research.First,this paper brings forward the flame-retardant technology of hemp fiber felt automobile upholstery plant substrate on basis of the detailed analysis of Mg(OH)2 and the flame-retardant interrelated theory.Second,this paper choose three factors:concentration of flame retardant,bond volume concentration,soaking time which have notable impact on hemp fiber felt as three experimental factors.By using orthogonal design,this experimentation gets optimum conditions and performance indicators of the flame-retardant finishing hemp fiber felt.The experimentation shows that when concentration of flame retardant is 300g/l,bond volume concentration is 20%,soaking time is 20min,experimentation result is better:LOI is 29.4%,afterflame time is 0.6s,aferglow time is 0.5s.Third,the result of the flame-retardant capability of the product in the optimized technology by CONE calorimetric analysis shows:the flame-retardant hemp fiber felt's the peak of heat release rate decrease 62.6%and average heat release rate decrease 61.6%; before 250s the average total heat release of flame-retardant hemp fiberfelt less then hemp fiber felt;before 700s the effective heat of combustion of flame-retardant hemp fiber felt less then largely hemp fiber felt 50%and under 40MJ/Kg,which explains that Mg(OH)2 controlled the release of flammable gas;ignition time is 30s and less then 18s to hemp fiber felt,fire propagation index enhance 3 times.It can conclude that: environment-friendly flame retardant Mg(OH)2 has good flame-retardant effect and flame-retardant quality is strong.Fourth,by contrast experiment,the experiment is utilizing HBO3 that its concentration is 4%to hemp fiber felt and analyzing flame-retardant capability by CONE calorimetric analyzer.It compares to utilize Mg(OH)2 to hemp fiber felt by above four indexes and educes the flame-retardant effect of environmental-friendly flame retardant Mg(OH)2 is better than HBO3.Fifth,it analyses the flame-retardant mechanism of which Mg(OH)2 active on hemp fiber felt base on the optimized technology though TG and DTA curve by thermogravimetric analyzers and differential thermal analyzers.The flame-retardant mechanism is explained when Mg(OH)2 flame-retardant hemp fiber felt is burning,the Mg(OH)2 can decomposed to MgO and H2O.At the same time,the protective effect of coverage,the endothermic effect and gas flame-retardant effect make Mg(OH)2 prevent the hemp fiber felt burning.
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