阻燃氨基树脂对胶合板燃烧时CO和CO_2释放的影响

Influence of inrumescent flame retardants and the amino resin on CO and CO_2 production of wood materials

【目的】研究阻燃氨基树脂对胶合板燃烧时释放CO、CO_2的影响机制。【方法】基于锥形量热仪研究了辐射强度30、50 k W/m^2条件下桉木、桉木胶合板、阻燃桉木胶合板燃烧过程中CO、CO_2的释放规律。【结果】CO_2释放速率和质量损失速率均在引燃阶段和炭燃烧阶段较高,在炭化阶段和阴燃阶段较低,释放规律受辐射强度影响较小;辐射强度对CO释放规律的影响主要表现在炭化阶段;阻燃氨基树脂中的氨基树脂使样品表面炭化层更为稳定,抑制了热解产物的挥发,造成燃烧后期CO_2的集中释放;阻燃氨基树脂对CO的释放规律影响较大,而且这种影响又与辐射强度密切相关。低辐射强度以及IFR膨胀炭质层的阻燃作用使CO的转化率大大提高。【结论】阻燃条件下,胶合板燃烧中CO_2的释放速率与质量损失速率变化趋势一致;CO释放速率在阴燃阶段达到最高;阻燃氨基树脂可抑制CO_2产生,促进CO产生。

[Objective] The influence of intumescent flame retardants and amino resin （IFR-MUF） on CO and CO2 production of wood materials was investigated. [ Method] CO and CO2 production of Eucalyptus saligna, E. saligna plywood, and E. saligna flame-retarding plywood was studied using a cone calorimeter （CONE） at 30 and 50 kW/m^2. [ Result ] The rate of CO2 production was highest during ignition and carbon combustion stages. The rate of CO production was highest at the smoldering stage, while the most significant effect of the radiance level on CO production rate was observed during carbonization. The utilized amino resin promoted the integrity of char layers, negatively affecting smoke release during the carbonization stage and enhancing CO2 production during the carbon combustion stage. The thermal conductivity of the carbon layer was higher than that of the airmade 2＂d peak of the CO and CO2 production rate curves earlier. The effect of IFR-MUF on CO production was closely related to radiance levels, with CO emission yields being markedly increased at lower radiance levels. [ Conclusion ] The trend observed for the CO2 production rate agreed with that of the mass loss rate, being slightly affected by radiance levels. IFR-MUF increased CO emission yields and decreased those of CO2.