Synthesis Of High Effective Intumescent Fame Retardantsapplied In PA6Engineering Plastic

Polyamide6(PA6) was developed by P.Schlack from the Farben,a company of German, usedin industrial production in1943.Because of the good comprehensive performance includingexcellent heat resistance, mechanical property, wear resistance, chemical resistance and easyprocessing characteristics,the PA6was widely used in machinery and equipment,chemical industryequipment, aerospace equipment and metallurgical equipment manufacturing industry, evenbecomes the largest amount of material engineering plastics. However, the limiting oxygenindex (LOI) of PA6is only23, easily to burn and the formation of hot melt droplet,also lead to thesecondary combustion,so the application areas are restricted, flame retardant of PA6graduallybecomes the focus of research.Flame retardants used in PA6engineering plastics includes brominated flame retardants,phosphorus flame retardants, nitrogen flame retardants,inorganic flame retardants and theintumescent flame retardant with the acid source, carbon source and the gas in one,most of theintumescent flame retardants are compounds containing nitrogen and phosphorus.In this thesis,9,10-Dihydro-9-oxa-10-phosphaphenanthrene10-oxide and1,3,5-TriglycidylIsocyanurate are used as the main raw materials for the synthesis of TGDO12type flame retardantand TGDO13type flame retardant,TGDO12as a flame retardant intermediate are used to be with4,4’-(4,4’-Isopropylidenediphenyl-1,1’-diyldioxy)dianiline and biphenyl-tetracarboxylic aciddianhydride as the main raw materials for the synthesis of BAPP1type flame retardants andBAPP2type flame retardants;9,10-Dihydro-9-oxa-10-phosphaphenanthrene and10-oxide1,3,5-Triglycidyl Isocyanurate are used and Tetrabromophthalic anhydride are used as themain raw materials for the synthesis of TGBD1type flame retardant and TGBD2type flameretardant,then characterized by DSC,IR and melting point apparatus.As a result,the melting pointof TGDO12、TGDO13、TGBD1、TGBD2are a little low,on the other hand,the melting point ofTGBD1and TGBD2are high,through the IR figure,we can see that: Characteristic absorptionpeak obviously,and of course every peak is compared the truth.After applied in PA6engineeringplastics with the percentages of5wt%by the twin-screw extruder,we have made six kinds ofmaterials with different comprehensive properties.the fire-resistant Properties of materials werestudied by Limit Oxygen Index Test、Vertical Flame Test,the physical properties of materials werestudied by tensile test、DSC、surface energy testing、water absorption testing、density testing.Allthe comprehensive properties were studied in details and give the best applying prescription.Theresults show that,among the six materials, When the percentage was5%,PA6engineeringplastics flame retardant grade is UL94V-2,TGBD2type flame retardant PA6engineeringplastic samples of residual combustion time of the first time t1was1s, second time t2was2s,and the limiting oxygen index (LOI) was28,compared with pure nylon, engineeringplastics flame retardant performance improvement is the best.At the same time,the tensile strengthwas67MPa,the elongation could reach192%, the notched impact strength reached15MPa,flexural strength reached112MPa,compared with pure nylon,all the comprehensive properties increased obviously.At last we concluded that the comprehensive performance of PA6engineeringplastic was the best when the mass fraction of TGBD2was5%,the mass fraction of Polyamideelastomer was10%,the mass fraction of KR103was0.3%.