Manufacturing method of phenol-urea-formaldehyde co-polymerized resin adhesive

Abstract of  KR20150043167 (A)

Provided are a method for producing a phenol-urea-formaldehyde cocondensed resin adhesive and a method for producing a fiber plate using an adhesive produced through the same. The method for producing a phenol-urea-formaldehyde cocondensed resin adhesive comprises the steps of: (a) obtaining a basic mixed solution by adding a strong alkali in a phenol solution; (b) adjusting a mole ratio of formaldehyde/phenol to 1.07-1.23 by adding primary formalin in the basic mixed solution under a condition with a reaction temperature of 40-50[deg.]C; (c) adding urea in a reactant from the (b) step and increasing the reaction temperature to 85-95[deg.]C to be maintained; (d) performing a condensation reaction by adding secondary formalin in a reactant from the (c) step and adjusting a mole ratio of formaldehyde/phenol to 2.1-2.4 thereby; and (e) obtaining a final product by cooling a reactant from the (d) step.