Study On The Environment Friendly Inorganic Waterborne Fire-Retardant Coating

Firstly, the JS-01 environment friendly inorganic waterborne fire-retardant coating prescription was preferably made by a series of orthogonal experiments and transverse comparing experiments. The limit time of fire-endurance of the coating was far more than the requirement of the National Standard. Meanwhile, the coating also had excellent physical-chemical properties, such as nonpoisonous, no VOC, water-resistance, hot-resistance and no harm to human or environment. Because of all of the advantage, such as plentiful raw material, easily produced, lowly cost and so on, the coatings became the functional coating, which had the fine market race and the excellent prospect of development and application.The inorganic binders of the coating was Al(H₂PO₄)₃ mixture, which came from the reaction of H₃PO+4 and Al(OH)₃ by mixing and heating. Meanwhile, the flame-retardant system was made up of APP, MEL and PER. The slag powder was first used as inorganic fillers in the prescription. The titanium dioxide and other corresponding assistants were also introduced to the coating.Secondly, using Zinc powders and MnO₂ powders as compound dryers of the coating, the drying time of the coating was in accord with the requirement of National Standard. In addition, the water-retardant property of the coating was more enhanced and its fire-retardant property of the coating maintained effectively by adding small amount of nanometer SiO₂ liquid into the coating.At last, with the help of modern analysis methods such as, Photo, SEM, XRD , GT and DTA, the fire-retardant mechanisms of the coating were studied. The image, forming and structure of the char-layers were discussed and analyzed. Then, the action of the char-layers in the flame-retardant course was explained. The compact, fine, close and porous char-layers were formed through a series of physical and chemical reaction when the layer of the coating was flamed.When the thermal conductivity of the char-layers was lower, its fire-retardant performance was more excellent. The experimental result showed that the white inorganic components in the char-layers were the mixture of TiP₂O₇ and TiO₂, which formed at high temperature. This mixture can strength the char-layer and protect the layer from collapse under the attack of fire. The more white inorganic components distributed homogenously on the layer, the coating had longer fire-retardant time and better fire-retardant properties.