Preparation Of Barium Phenolic Foam Plastic And Research On Its Retardant System

Barium phenolic is a kind of thermosetting resin which is synthesized by formaldehydeand phenol under alkaline catalyst by in the preparation stages of condensation,and filtrationand dehydration. Compared with the general thermosetting phenolic resin,it has a lowviscosity, fast curing temBature, lower the molding temBature, etc., but also has goodcorrosion resistance. Under the same conditions, flame retardant, corrosion resistance andother proBties of barium phenolic resin-based composite foam plastic is more suBior. ThispaB takes full advantage of barium phenolic resin’s the advantages of its own, its flameresistance, corrosion resistance significantly improved after synthesis of barium phenolic resin,foaming and flame-retardant modified to obtain halogen flame retardant foam plastic. It hasfar-reaching significance for green building’s exterior wall development and Alication offireproof material currenttly.Firstly, by determination of the physical and chemical indicators，such as free phenolcontent, free formaldehyde content, the resin activity, viscosity and solids content, researchon the effect of synthesis conditions，such as reaction temBature, amount of catalyst, F/P moleratio and reaction time. On basis of weakening the interaction of factors designed orthogonaloptimization testing to determine the process formula of synthetic foaming barium phenolicresin, infrared spectroscopy (IR), thermal gravimetric (TG) and nuclear magnetic resonance(NMR) were used to analysis the structure and heat resistance of the resin. It shows that whenthe temBature is85℃, F/P mole ratio is1.5, reaction time is2h, the amount of catalyst is5%,vacuum dEree is0.08~0.093Mpa, filtration time2~4h, the results were measured as solidscontent is74~84.7%, viscosity is2300~4300mpa s, free phenol content is4.73%, methylolcontent (24h test value) is28.16%. TemBatur, F/P mole ratio, amount of catalyst, reactiontime had a remarkable effects on the structure of barium phenolic resin. The carbon residue ofcured resin is49.6%at750℃.Secondly, the barium phenolic resin was foaming molded, and the effects of temBature,foaming agents and curing agents on the overall Bformance of the foam were studied. Thepreparation conditions of foam was determined as follows, with the viscosity is2500~4300mpa.s, solids content is74~80%, temBature is75℃,100parts of barium phenolicresin,15parts of foaming agent,14.5to21parts of curing agent,2~5parts of surfactant, a conclusion of0.02431W/m k, the compressive strength is0.12Mpa and density is54kg/m3was obtained. The carbon residue of cured barium phenolic resin was tested as66.3%at750℃and limiting oxygen index as54%by means of SEM, LOI and TG. All this indicatedthat the limiting oxygen index of foam was increased for the introduction of phosphorus bythe curing of composite acid phosphate and contrapuntal toluenesulfonic. Also the uniformfoam size and0.4~0.55mm of foam diameter were achieved.Finally through the design and test of phenolic foam solution we used the limiting index(LOI) to evaluate the ability to resist fire of flame retardant phenolic foam which was added to intumescent flame retardant system which included E、A/B/C、D/Band E/A/B/C composite synergistic flame retardant that was based on theoretical calculation of flame retardant by physical blend foaming,and study pyrolysis behavior of retardant barium phenolic foam by TG, explore flame retardant mechanism, and finally areasonable ratio of flame retardant system is: E amount of5-10%; A/B is2:1~4:1, Caddition amount of0.57%; D/B is4:1; A/B is4:1, C was0.25%, E is10%.Phenolicfoam was prepared in65%-84%LOI, thermal coefficient of0.02589~0.03145W/m k,the compressive strength of0.0983-0.1493Mpa, a density of65~75kg/m3. A reasonableproportion of phenolic foam for flame test can be made of barium, tested its LOI of86%, compression0.13Mpa, density68kg/m3.By flame retardant barium phenolic foam TG curve analysis, when E, A/B is4:1and D/Bis4:1, respectively dosage of5%, respectively, corresponding to the residual carbon was61.4%,76.3%and82.6%when temBture is750℃. Thus the phenolic foam retardant carbonresidue greatly improved in meeting the national standard conditions. In addition, this articlealso research on A2grade fire feasibility by blending foam with phenolic resin、inorganicflame retardant aluminum hydroxide (ATH) and expanded Blite, after flame-retardantphenolic foam bonded with expanded Blite blends, carbon residue58.3%, temBature13.3℃,burning time57s, bulk density190kg/m3, it is great significance for further study oflightweight grade A2incombustible insulation board.