PAI-1251 is a phosphate ester monomer for functional modification, containing unsaturated double bonds, and can be used in the synthesis of water-based emulsions and oil-based acrylic resins. It is used in radiation curing systems to increase adhesion to substrates and is widely used in circuit board light-curing solder resist inks, metal inks, metal overprint coatings, UV wood, etc.
The choice of flame retardant
There are many types of flame retardants with different properties, and the flame retardant mechanism of each flame retardant is different . When selecting flame retardant varieties, it is necessary to closely combine the performance and structural characteristics of the fire retardant coating itself, the flash point, spontaneous ignition point and decomposition temperature of other components in the fire retardant coating formulation.
According to these, the structural characteristics of the flame retardant itself, the activity of the chemical reaction and the thermal decomposition temperature, the content of solar elements of the flame retardant, the chemical properties of the thermal decomposition products of the flame retardant, and the compatibility of the resin and the flame retardant are carried out. choose. In addition, the flame retardant and flame retardant additives should be selected by referring to the relevant domestic and foreign materials, combining the domestic resource situation and price, and the use of the fire retardant coating. Conduct a single performance experimental study on the pre-selected applicable flame-retardant materials. Through thermogravimetric and differential thermal analysis, the thermal decomposition and flame retardancy of the sun-burning material are determined. At the same time, the flame retardant should be selected according to the purpose and the special performance that is emphasized. For the flame retardant, it must be able to cooperate with the base material of the fire retardant coating, and the components must be consistent when exposed to fire. The heat insulation, foaming, best synergy and decorative properties of the fire retardant coating and coating are required. The relationship between layer thickness, foam layer height, density, hardness and fire resistance is studied experimentally, and the composite flame retardant is screened.
The following briefly introduces the principles of screening and design of flame retardants for various types of fire retardant coatings.
The flame retardant selection C9, 11.12 of the intumescent fire retardant coating should be based on the principle of forming an intumescent foaming system, and the flame retardant should be screened. The selected flame retardant must be able to cooperate with the intumescent fire protection system to determine the acid source, blowing agent, carbon source, halogen, auxiliary agent and other flame retardant additives.
The expansion and foaming of intumescent fire retardant coatings to form a carbon foam layer requires three basic elements: acid source (catalyst), gas source (blowing agent) and carbon source, and at the same time requires organic synergy among the three elements.
The coating film is softened by heat, and the gas source material therein decomposes and generates gas. The escape of the gas causes the softened coating film to bubble and expand. At the same time, the acid source decomposes to liberate acidic free ions, catalyzes the carbonization of the material, and dehydrates it to form a carbon frame, so that the expanded coating has a certain degree of compactness. As this process proceeds, an wax emulsion suppliers expanded hair with good heat insulation is finally formed. Bubble layer. It should be pointed out that in order to make the intumescent fire retardant coating produce a good intumescent fireproof insulation layer, when selecting the flame retardant that constitutes the intumescent fire protection system, it is necessary that after the fire retardant coating is heated, the intumescent flame retardant composition in the intumescent flame retardant should be generated in an appropriate order. A series of chemical and physical reactions, such as the decomposition temperature of the char-forming flame retardant, needs to match the temperature at which the acid-source flame retardant compound produces an acid that plays a role in dehydration.
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