The solidification of the liquid is the result of the molecular structure is changed, if improve the curing speed of phenolic foam, should accelerate the polycondensation reaction, accelerate the speed of the molecular structure of the networked.
Accelerate the curing process of phenolic foam, is to improve the foaming temperature and mixture increases acid dosage of curing agent.
The expansion of the bubble and curing must be adapted to the degree of polymer polycondensation reaction, thermosetting phenolic foam viscoelasticity and liquidity is depends on the molecular structure of crosslinked intensity.
During the curing reaction of phenolic resin with acid curing agent, the violent reaction, gives off heat, phenolic foam forming process is very complex chemical reaction mechanism, through a complex chemical reaction between components and physical change, to generate the main chain of the phenolic resin, and the molecular chain, alternating chain reactions such as foam, gas expansion, several kinds of chemical reactions occur at the same time.
In the process of reaction is a chemical reaction occurs in a certain time and at the same time balance, the balance of forces in the whole period of time is used to maintain the stability of the gas in the emulsion dispersion.
Phenolic foam density is one of the important physical properties, the conventional phenolic foam, after the formation of mesh in the molecular structure, namely the cross-linking points and more dense, foam density is big, the bubble high compression strength, size stability and temperature resistance is better also.
Hours, on the other hand, when the bubble density compression strength is small, body easy display brittleness.
Phenolic foam quality involving raw material selection and combination between reasonable configuration of components, and the quality of raw material is good or not, a direct impact on the spraying, the appearance of the casting and production plate quality and product technical performance.
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