硅灰石和膨润土增强膨胀型钢结构防火涂料

Experimental study on wollastonite and bentonite reinforced fire retardant coatings for expanded steel structures

合成具有改善钢结构耐火性能的膨胀型涂料的新配方,涂料配方基于硅灰石和膨润土增强的可膨胀石墨,根据硅灰石和膨润土含量及不同研磨时间配制了十种膨胀型涂料配方。结果表明:随着填料(硅灰石和膨润土)含量和研磨时间增加,炭膨胀率增加,同时能够减少热源向钢板基材的热渗透。X射线衍射(XRD)分析表明残炭中含有硼酸铝,硼酸铝具有很高的热稳定性,能增强涂料的耐火性能。随着填料含量和研磨时间增加,残炭中碳含量增加、氧含量减少、磷含量增加,较高比例的磷能够有助于增加碳质炭的形成。较高填料含量和研磨时间能够增加残余重量和耐火性能。

The focus of this article is to synthesize new formulations of intumescent coatings with improved fire resistance of steel structures.The coating formulations are based on wollastonite and bentonite-reinforced expandable graphite.Ten types of intumescent coating formulations are formulated based on the content of wollastonite and bentonite and different grinding times.The test results show that as the filler(wollastonite and bentonite)content and grinding time increase,the carbon expansion rate increases,and at the same time,it can reduce the thermal penetration of the heat source to the steel plate substrate.X-ray diffraction(XRD)analysis shows that the residual carbon contains aluminum borate,which has high thermal stability and can enhance the fire resistance of the coating.With the increase of filler content and grinding time,the carbon content in the residual carbon increases,the oxygen content decreases,and the phosphorus content increases.A higher proportion of phosphorus can help increase the formation of carbonaceous carbon.Higher filler content and grinding time can increase residual weight and fire resistance.