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通过对已有多孔材料导热系数计算模型的总结和分析,提出了湿热老化后膨胀型钢结构防火涂层导热系数的计算模型。为考察该模型的计算精度,进行了湿热老化试验及隔热性能试验,测量涂层膨胀倍率、炭化层泡孔尺寸和钢板温度等数据。结果显示,湿热老化后炭化层泡孔尺寸增大导致涂层导热系数增大,隔热性能下降,钢板温度上升。利用本文试验测量数据(泡孔尺寸)计算炭化层导热系数,再根据炭化层导热系数的数值计算结果分析钢板温度,并将钢板温度的计算结果与试验结果进行对比,两者吻合良好,验证了膨胀型防火涂层导热系数计算模型的适用性。
Based on the summary and analysis of the calculation model of the thermal conductivity of the existing porous materials, the calculation model of the thermal conductivity of the intumescent steel structure fire-retardant coating after wet-heat aging is proposed. In order to investigate the calculation accuracy of the model, the wet heat aging test and the heat insulation performance test were carried out. The expansion ratio of the coating, the cell size of the carbonized layer and the temperature of the steel sheet were measured. The results show that the increase of cell size, the increase of thermal conductivity, the decrease of thermal insulation and the increase of the temperature of the steel sheet. The thermal conductivity of the carbonized layer was calculated by the test data (cell size). The temperature of the steel sheet was calculated according to the numerical calculation of the thermal conductivity of the carbonized layer. The calculated results of the temperature of the steel sheet were compared with the experimental results. Applicability of thermal conductivity calculation model of intumescent fire retardant coating.