Phenolic foam was applied early in the insulation of missiles and rocket heads. In recent years, due to high-rise buildings, transportation, ships, aviation, space technology and other aspects of synthetic foam, thermal stability and flame resistance, strict requirements, as a new type of multi-purpose foam, in addition to other insulation In addition to the insulation effect that the material can achieve, it is also a very good fire safety material. It has the characteristics of light capacity, good heat insulation, high rigidity, good dimensional stability, etc., and it has a similar expansion coefficient as aluminum. It is a kind of incombustible substance. It only produces a small amount of carbon monoxide toxic gas when burning, and the amount of smoke is low and will not melt. No dripping, its production cost is even lower.
The phenolic foam is a phenolic resin as a main raw material, and a curing agent, a foaming agent and other auxiliary components are added. When the resin is cross-linked and cured, the foaming agent generates a foamed plastic which is dispersed by gas and foamed. It has many excellent properties, first of all heat resistance - the final cured phenolic foam has a structure comprising several phenol rings and connected by a methylene bridge. It is known by thermodynamics that the methylene bridge is in the organic connection and is affected by temperature. One of the smallest, most stable connections, which gives phenolic foams excellent thermal stability.
It can be used for a long time at 150 °C, and the instantaneous working temperature can reach 200-300 or more. Its high temperature resistance is obviously superior to other foams. "Flame fire" is also outstanding. Phenol molecules are good free radical absorbers. During the pyrolysis process, the free radicals produced by the cleavage of the methylene bridge are rapidly absorbed by the phenol molecules, preventing the reaction from proceeding. This phenomenon makes the phenolic foam extremely difficult to burn; phenolic foam The oxygen index is 50, no need to add any flame retardant additives, the flame retardant grade is flame retardant B1 grade.
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