Appearance : Clear liquid
Functionality : 3
Viscosity (mPa.s/25℃) : 600-800
Acid value (mgKOH/g) : 120-160
Density (25℃) : 1.26-1.35
At the same time, the time and speed of blowing the flame retardant to release gas should be consistent with the time and speed of forming the viscous carbon by the char-forming flame retardant, so as to form a fine porous sponge-like carbon layer. It can be seen from the expansion and foaming mechanism of the coating film that the foaming rate of the foaming layer is closely related to the foaming agent, and the density of the foaming layer is related to the carbon source material. The quality of the coating expansion foaming layer is determined by The height and density of the foam layer are reflected in two aspects. The better the quality of the foam layer, the better the fire and flame retardancy of the fire retardant coating. The selected flame retardant must be wax emulsion sds able to expand and foam to form a uniform, strong, and dense fire and heat insulation layer.
The choice of flame retardant for ultra-thin intumescent steel structure fire retardant coating [13.14] The flame retardant of intumescent fire retardant system is mainly composed of acid source, carbon source, foaming agent, etc., due to the coordination of PN of phosphorus and nitrogen system composite flame retardants. It has a good flame retardant effect. It not only has a good flame retardant effect, but also is non-toxic. It does not produce dense smoke and poisonous gas when burned. It has no environmental pollution. It has a rich source of raw materials. The intumescent flame retardant, which has three components in the same body, is also a new type of environmentally friendly flame retardant. Flame retardant additives such as borates, phosphates, metal oxides and various amines in the coating have the functions of flame retardancy, rust prevention, mildew prevention, bacteria prevention, pollution prevention, chalking resistance, and discoloration prevention.
The performance of flame retardant additives plays an important role in the fire performance and corrosion resistance of fire retardant coatings. Therefore, when selecting flame retardants for ultra-thin intumescent steel structure fire retardant coatings, the selection of these types of flame retardants can be considered. According to relevant data and domestic resources, a single performance test of the pre-selected flame retardant is carried out first, and the thermal weight is passed. Sum differential thermal analysis to determine the thermal insulation and flame retardancy of the flame retardant, and test its bulk density, water absorption, foaming, corrosion resistance and other properties. Since the fireproof and heat insulation performance of intumescent steel structure fireproof coatings is achieved by the low thermal conductivity of the foamed layer formed after the expansion of the coating, the foamed layer is required to have a strong resistance to the steel substrate at a high temperature of 1000°C.
The adhesion, that is, the foam layer will not fall off at high temperatures, and the quality of the foam layer: directly affects the fire and heat insulation performance of the coating. In the process of expanding and foaming the coating to form a flame-retardant and heat-insulating protective layer, there is a contradiction between the foaming rate and the density of the foamed layer. How to solve this contradiction so that the fire-retardant coating has high-efficiency, heat-insulating and fire-proof performance? It is one of the difficult points and key technologies of research work.
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