Study On Properties Of Aluminum Diethylphosphinate Retardent System On Glass Fiber Reinforced Flame Retardent Copolyamide 66

The composites of glass fiber reinforced polyamide 66 have excellent mechanical performance,chemical stability and electrical properties,applied to automobile,and electric,electronic,building and etc industry.With the expansion of application areas and requirements to materials increasing by industry,it is particularly important to reseach the flame retardant of glass fiber reinforced nylon.However,glass fiber easily lead to “candlewick effect”,it promote the combustion process when materials burns.Traditional halogen-eontaining flame retardant has a good flame retardant effect to glass fiber reinforced nylon,but it is easy to produce toxic and harmful gases,seriously affecting people's production and life.Therefore,halogen-free flame retardant was researched to glass fiber reinforced nylon,gradually becoming a hot spots.In this paper,The glass fiber(GF),Aluminum diethylphosphinate(ADP),Melamine(ME),TAF,antioxidants were added to the flame-retardant copolymer nylon 66(FR-PA66)to prepare different flame retardant systems of flame retardant glass fiber reinforced nylon 66 composites.The main research content: The flame retardant properties of glass fiber reinforced flame retardant copolymer nylon 66 were studied.Effect of different content of one-component flame retardant ADP and the same content of different proportions of two-component flame retardant ADP?ME on glass fiber reinforced flame retardant copolymer nylon 66 were studied.Mechanical properties of composites were researched by different content of one-component flame retardant ADP and the same content of different proportions of two-component flame retardant ADP?ME.The results showed:(1)By preparation of glass fiber reinforced flame retardant copolymer nylon 66 composites,flame retardancy study show that,it was not affected on degradation of FR-PA66,but reducing the decomposition rate of the material,improving stability and increasing residue char content with increasing of the glass fiber contents;And the value of oxygen index and vertical combustion grade decreased with the increase of the glass fiber contents.Analysis the morphology of residual carbon,residue char became looser and the char layer density decreased,leading to a decrease in the role of isolation of oxygen and heat of residue char with glass fiber.(2)Preparation of Flame Retardant Glass Fiber Reinforced Flame Retardant Copolymer Nylon 66 Composites were added to one-component flame retardant ADP and two-component flame retardant ADP / ME,flame retardancy study show that,when the ADP content of the one component flame retardant was 16%,retardant effect is the best.When the two-component flame retardant ADP / ME ratio of 60:40,retardant effect is the better.Compared with thermal stability and carbon residue morphology of composites with no flame retardant,16%ADP,and 16% of the ratio of 60:40 of the ADP / ME,it shows although the thermal stability of the ADP / ME ratio of 60:40 was poor,expanded carbon layer was density and improve the flame retardant properties.(3)Studied on the mechanical properties of one-component flame retardant ADP and two-component flame retardant ADP / ME to GF?FR-PA66,the result shows that ADP decreased the tensile and impact strength of the material.Flexural strength increased first and then decreased.The tensile strength was improved with the same content of two-component flame retardant ADP / ME.The impact strength and flexural strength increased first and then decreased of the material.Considering mechanical properties,when the ratio of ADP / ME was 70:30,overall mechanical properties of the material was best.