Synthesis method for beta-naphthol modified phenolic resin
A technology of novolac resin and synthesis method, which is applied in the field of synthesis of B-naphthol modified phenolic resin, can solve the problems of unsatisfactory refractory effect, reduce the curing density of phenolic resin, and low fire resistance, so as to facilitate fireproof coating Application, improvement of curing characteristics, and prolonged pot life
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[0011] A kind of synthetic method of B-naphthol modified phenolic resin, comprises the following steps:
[0012] A, β-naphthol, phenol are added in the batch reactor with molar ratio 1: 2-1: 6 ratio, add hydrochloric acid or sulfuric acid, wherein hydrogen chloride or sulfuric acid molar dosage are 6-20% of phenol molar dosage, make with water Solvent, heat up to 80-90°C, add paraformaldehyde or formaldehyde aqueous solution, wherein the molar amount of formaldehyde is 1-2 times the molar amount of phenol;
[0013] B. After the formaldehyde is added, the temperature is raised to 120°C, the product is separated from the water, and the viscous product is separated from the water to obtain a modified novolak resin intermediate, which is added in a batch reaction at a molar ratio of 1:2-1:5. In the container, add hydrochloric acid or sulfuric acid, wherein the molar dosage of hydrogen chloride or sulfuric acid is 5-15% of the molar dosage of phenol, use water as solvent, and heat ...
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