Preparation And Characterization Of Environmentally Friendly Flame-retardant Reed-based Fiberboard

The resource utilization of reeds in Baiyangdian has attracted attention,the production of Reed-based fiberboard is a possible solution.Reed is a flammable material,especially the prepared fiberboard has poor fire resistance,is easy to cause fire and releases a large amount of smoke,so the flame retardancy research of reed fiberboard is essential.In this paper,Reed fiberboards were prepared by reed fiber and three adhesives and Inorganic flame retardants were used to prepare flame retardant reed fiberboards.The main research contents are as follows:(1)High-density binderless reed fiberboard(FRFB)was prepared by reed fiber and 3-triethoxysilyl-1-propanamine(KH550),magnesium hydroxide(MH)and aluminium hydroxide(ATH)and expanded graphite(EG)and sodium aluminium silicate(SAS)were used to prepare flame retardant FRFB.Experimental results showed that when the addition amount of KH550was 2%,the mechanical properties of FRFB are the best,among the four flame retardants,the compatibility between MH and FRFB was the best and the flame retardancy of FRFB increased;When the addition amount of MH was 25 phr,FRFB showed higher mechanical properties and LOI can be up to 29.7%.(2)EVA crosslinked high density reed fiberboard(ERFB)was prepared by reed fiber and ethylene-vinyl acetate copolymer(EVA)adhesive and dicumyl peroxide(DCP)crosslinking agent,magnesium-aluminium hydroxide(MATH)and EG were used to prepare flame retardant ERFB.The results showed that when the addition amount of DCP was 0.15%and the hot pressure was 80 MPa,the mechanical properties of ERFB can meet relevant standards;When the addition amount of MATH was 25 phr,the flame retardancy of sample(ERFB/M25)was poor,the LOI of sample was only 27.1%,and the mechanical properties of ERFB/M25 reduced greatly.After replacing parts of MATH with EG,when the addition amount of flame retardant was 20 phr,the flame retardant properties and mechanical properties of ERFB/E both improved;When 4 phr of EG was substituted for MATH,the LOI of sample(ERFB/E4)can be up to29.7%,and ERFB/E4 can pass the V-1 level of the UL-94 grade test,at the same time,modulus of rupture(MOR)and modulus of elasticity(MOE)of ERFB/E4 increased by 38.6%and 63.9%,respectively.Compared with the ERFB/M25,cone calorimeter test(Cone)results showed that the peak heat release rate(PHRR)and total smoke production(TSP)of ERFB/E4 decreased by49.6%and 72.3%,respectively.(3)MDI medium density reed fiberboard(MRFB)was prepared by methylene diphenyl diisocyanate(MDI)adhesive and trimethylolpropane(TMP)hardener,MATH and boric acid(BA)was used to prepare flame retardant MRFB.The results showed that when the addition amount of TMP was 1.5%and reed fiber mesh was 60 and hot-pressing temperature was 180~oC,the mechanical properties of sample can meet relevant standards.When the addition amount of MATH was 25 phr,the LOI of sample was 36.4%,but the mechanical properties decreased drastically.After mixing BA and MATH,when the addition amount of flame retardant was 20phr,the flame retardant properties and mechanical properties of sample(MRFB/M20)both improved.Compared with the MRFB/M20,when 4 phr of BA was substituted for MATH,the LOI of sample(MRFB-B4)can be up to 34.6%and pass the V-0 level of the UL-94 grade test,at the same time,MOR of MRFB-B4 increased by 83.3%.SEM,TG and FT-IR analysis showed that the addition of BA promoted the solidification of MDI.Cone results showed that PHRR and TSP of MRFB-B4 decreased by 39.3%and 78.9%,respectively,compared with the MRFB/M20.