Under appropriate conditions, a yuan hydroxymethyl phenol continue addition reaction, can generate binary and multiple hydroxymethyl phenol, condensation and polycondensation reaction, reaction conditions with different can occur in the hydroxymethyl phenol and phenol molecules between, can also occur in each hydroxymethyl phenol between molecules.
Condensation reaction ongoing results, will be condensed form certain molecular weight phenolic resin, because polycondensation reaction has gradually characteristics, intermediate product is quite stable and thus be able to separation and to study. For many years research analysis usually think, influence phenolic resin synthesis, structure and characteristics of the four main factors as follows:
(1) raw materials chemical structure;
(2) phenol and formaldehyde of molar ratio;
(3) reaction medium acid, alkaline;
(4) the production method of operation.
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