Resol melamine resin soluble in water and stable storage.

摘要

"Resol melamine resin soluble in water and stable in storage, a phenol formaldehyde resin modified by melamine, alkaline, curable,It is prepared from a starting resin phenol formaldehyde resol containing from 0.5 to 2.5 percent of free formaldehyde by expulsion of formaldehyde with 1 to 12 parts of melamine per 100 parts of the original resin, where the molar ratio of formaldehyde to melamine is 0.2 to 1.5 moles of formaldehyde per mol of melamine, to reduce the free formaldehyde to less than 70% of that in the initial resin and preparing a resin stable in armazanagem,Which contains less than 0.7% of free formaldehyde, and which maintains its stability under the conditions of application.An ammonium salt of strong acid and additional water is incorporated in the resin modified by melamine to prepare an alkaline binder.The binder is sprayed on glass fibre with low formaldehyde emission, good stability and fast curing in the acid.