Structure Design And Preparation Of Flame Retardant And Explosion Suppressing Polymer Composites For Fuel

With the rapid development of modern society,the use of fuel is more and more extensive.The use and storage of diesel,gasoline and liquefied petroleum products are urgently to be solved.On the battlefield,if the fuel tanks of combat equipment and transportation equipment,such as aircrafts,tanks,ships are hit by a shell,they can causing heavy casualties.In order to avoid this situation,we must reduce the safe hidden trouble of oil.When the explosion-proof material is filled in the fuel tank,it can effectively prevent sudden fire and blast shock.And then the fuel tank will not easily burn and explode.Therefore,the storage and transportation safety of inflammable and explosive dangerous goods have always been the focus of attention.During the transportation,the shake of fuel can produce and accumulate static,so it is very easy to happen the accidents,such as explosion.So,in this paper,a new type of flame retardant explosion suppression materials-spherical non-metallic explosion-proof material are produced,and the property of base material is improved.At the same time,in order to provide data support for the industrial production of new flame retardant materials.The flame retardant test,melting mobility and antistatic test and other factors affecting the flame retardant explosion-proof material performance is studied,flame retardant explosion suppression materials is the key to the current fuel storage transportation.In order to develop explosion suppression material,its flame retardant performance must be researched firstly.The main research contents of this paper are the following three parts:1.Non-polar LLDPE was chosen as the substrate,and ammonium polyphosphate(APP)/pentaerythritol(PER)was used as the intumescent flame retardant system.The flame-retardant synergist was a 4A zeolite prepared from kaolin and the 4A-Zn2+ was loaded with Zn2+.The structure of the 4A zeolite was characterized by X-ray diffraction(XRD)and Fourier transform infrared spectroscopy(FTIR).The flame retardancy of the LLDPE/IFR/4A-Zn2+ composite was determined by limiting oxygen index(LOI),vertical burning test(UL-94)and cone calorimeter test(CCT)evaluation,thermal stability was evaluated by thermogravimetric analysis(TGA)and gradient heating FTIR.The results showed that the LOI value of the LLDPE/IFR/4A-Zn composite system was increased to 28.5%,and pass the UL-94 V-0 rate.The heat release rate(HRR)was significantly lower than that of pure LLDPE,and the PHRR decreased by as much as 53.3%.The results of TGA show that the thermal stability of LLDPE composites increases,and the final char residue increases to 8.7%.Scanning electron microscopy(SEM)analysis showed that 4A-Zn was beneficial to enhance the quality and strength of the char layer of LLDPE composites.Another synergistic flame retardant thioacetamide(TAA)intercalated kaolin(KT)also showed excellent flame retardant effect in the LLDPE/TFR system,with a LOI of 27.5%and vertical combustion through UL 94 V-0 grade.2.A certain polarity of polyamide 6(PA6)was selected as the matrix resin,melamine cyanureate(MCA)/conductive graphite(CG)was used as flame retardant,and the prepared acidified kaolinite(A-K)was a synergistic flame retardant.The results showed that after adding 1wt%A-K in the PA6/MCA/CG composite system,the LOI increased to 26.4%,the vertical combustion reached the UL 94 V-0 rate,the melting drop phenomenon was also suppressed,and the amount of char residual at 600 ? increased to 9.8%;After adding A-K,the melt index of PA6 composite system increased and the fluidity of melt was obviously improved.The structure of the char layer after combustion becomes smooth and compact.3.POK with excellent solvent resistance and good processability was used as matrix resin,organophosphorus AHP and OP930 as flame retardants and mixed with polyketone resin to prepare a flame retardant POK composite system.The flame retardancy and mechanical properties of POK composite system were studied by testing LOI,UL 94,TG,melt index,tensile and impact properties.When the addition of flame retardants was 10%,the LOI of the POK system increased to 29.3,reaching the UL 94 V-0 level.The thermal stability is improved,the initial decomposition temperature is advanced,the flame retardants and the matrix combustion are promoted to char,the amount of char residual is greatly increased,and it can reach 43.4%at 800?.The melt index decreases with the addition of flame retardant.There is a slight decrease in mechanical properties,but it does not affect the processing and application of materials.