反应详情

Phenol and formaldehyde in a phenol-formaldehyde molar ratio of 1:3.2 were reacted together to obtain a resole resin having about 1% free phenol and 7% free formaldehyde. Sufficient water was added to yield an aqueous resole resin solution mixture having about 51% solids content. Phenol-formaldehyde resin (6263 pounds), to which an aqueous solution of urea (3422 pound, 40% by weight of urea) was added, while the resulting solution was stirred to ensure homogeneous mixing. The temperature of the resulting solution was maintained from about 50° F. to about 70° F. (10° C. to about 21° C.). This premix solution had a density of about 9.69 lb/gallon and a solids content of about 47.1±2%.

1. customto obtain a resole resin
2. customto yield an aqueous resole resin solution mixture
3. temperatureThe temperature of the resulting solution was maintained from about 50° F. to about 70° F. (10° C. to about 21° C.)