PAI-1251 curing fast, high hardness, adhesion to plastic substrates, especially metal substrates to promote obvious, water resistance, yellowing better than other products of the same type.
If the expansion and foaming rate of the coating is too low, the effective insulation distance between the fire source and the steel substrate is short, and the temperature of the steel substrate will rise quickly, so the fire and heat insulation effect is poor; if the expansion and foaming rate of the coating is too large , The foamed layer has poor strength and is easily broken by the flame, causing it to crack and the flame will directly attack the steel substrate, and the steel loses its supporting ability. This requires mastering the amount of foaming agent and finding an optimal height for the expansion foam layer of the coating.
When it is near this value, the foam layer has a certain strength and the fire source and the steel substrate have a certain degree of strength. Thermal insulation distance, so as to obtain a high-quality foam layer, to achieve a good thermal insulation effect. In the research, the addition of a certain amount of inorganic flame-retardant additives is used to improve the quality of the expansion foam layer of the coating to achieve the best fire protection effect. Experimental research explores flame-retardant additives to solve the problem of foam layer density; explores flame-retardant foaming agents to solve the problem of foaming rate; explores the reasonable wax emulsion uses ratio of flame-retardant foaming agent and flame-retardant additive skeleton material to make expansion The foam layer reaches the best value in height and density, so that the steel structure fireproof coating has excellent fireproof and heat insulation performance.
For example, in the experimental research of SCB ultra-thin intumescent steel structure fire-retardant coating flame retardant additives, the selected phosphorus and nitrogen system composite flame retardants were studied as follows. First, through thermogravimetric and differential thermal analysis, the flame retardancy of phosphorus and nitrogen system composite flame retardants is analyzed and studied. It not only has a good flame retardant effect, but is also non-toxic, does not produce dense smoke and poisonous gas when burned, has abundant raw material sources, and low cost. It is a new type of green and environmentally friendly flame retardant. The SCB ultra-thin intumescent fire-retardant coating for steel structure formulated with it has achieved better results.
(3) The choice of flame retardant for transparent fire-retardant coatings  For flame retardants, it must be able to cooperate with the base material, and the components must be consistent when exposed to fire, and expand and foam to form a uniform, strong and dense fire-retardant heat insulation. Due to the limitation of transparency, an important indicator, very high requirements are put forward for the selection of flame retardant additives. Flame retardant additives, polyhydroxy carbon-rich compounds, foaming agents, etc., must be compatible with the base material and solvent, or liquid in itself but transparent after curing. On this basis, the flame retardant is screened and passed Thermogravimetric and differential thermal analysis analyze and study the flame retardancy of selected flame retardants, and analyze the thermal insulation, foamability, best synergy, coating thickness, foam layer height, density, and hardness of fire retardant coatings. Conduct experimental research on the relationship between fire resistance and transparency.
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