The Research On PNB Bamboo Fire Retardant Research

In our country bamboo material resource is abundant, bamboo material as building structure material has huge development potential.Bamboo material is similar with timber, constitute from the cellulose, half cellulose, lignin, its combustible. So at the adoption bamboo be building structure material have to forerunner fire retardance processing.Domestic and international have already carry certain research to the timber fire retardance, but aim at the fire retardance of bamboo material research is few. Environmental protection type fire retardant is the future wood quality material fire retardant. According to currently Domestic and international wood quality material fire retardce realm research condition, be established in solve bamboo material as building material combustible problem, this thesis adopt new type PNB fire retardant to process bamboo material.Main research's result is as follows:1.By a great deal of of experiment get a synthesize craft be becoming to the PNB fire retardant.Heat velocity is 1℃/min, the heat preservation temperature is 90℃, heat preservation is 3.5 hour. The dicyandiamide, phosphoric acid, water ratio is 1:1:110, carry on reaction to get a pH value is 6.5 clarify aqua.Measurement the conversion rate of the dicyandiamide attain above 92%, the GUP contain 8.44%, and the oxygen index number, smoke density all attain the GB8624-2006 B1 class request.The boric acid joins to make an ability to attain the fire retardce of equal effect a density to lower. Its effective heighten valid exaltation fire retardant's utilization. When P: N:B is 1:1:1.2 or 1:1:1.5, the GUP density is 0.7% or 1%, the medicine carry rate can reach to 9.78%, the amount of smoke is little, and the effect of fire retardce is obvious. The permeate joins to make the ability exaltation bamboo material fire retardce processing of depth, and the oxygen index number can reach to 37.8, the smoke density also consumedly descend.2.By the examination of the hygroscopic power, size stability, anti-run off capability, mechanics function to judge PNB fire retardant's application function. Bamboo material handle by the PNB fire retardant hygroscopic power is higher than untreated bamboo material, the fire retardance have certain influence to material's hygroscopic power, but the influence is not big;The size stability of the PNB fire retardce processing bamboo material slightly has an exaltation than the untreated bamboo material; The fire retardance have certain of the anti-run off capability, average the anti-immerse to lift value is 37.61%, however it's look towards treat further improvement; The fire retardant isn't obvious influence the bamboo material mechanics property's, modulus of elasticity descend 2.54%-8.19%, static tune intensity descend 0.77%-12.47%.3.Through nuclear magnetic resonance experiment (NMR), hot heavy analysis (TGA) and scan electricity mirror (SEM) etc. carry on mechanism analysis to the PNB fire retardant. The C≡N key conversion in the dicyandiamide change to C=O key, the GUP success conversion; fire retardce processing bamboo material at 600℃of hot resolve survive higher quality ratio than don't processing bamboo material; The fire retardant after dilution, the processing bamboo material fire retardce can more and evenly distribute the surface of the bamboo fiber,get better fire retardance effection.