Formaldehyde → Resorcinol-formaldehyde resin

Participants

Reaction Conditions

Reaction Steps

After 280 g of water and 523.6 g of resorcinol were placed in a 2 L flask made of glass and the whole dissolved at 50° C., 1.2 g of p-toluenesulfonic acid was charged into the reaction vessel. While the reaction system was maintained at 120 to 125° C., 224 g of 37% formalin was added dropwise over a period of 300 minutes and, after the completion of the dropwise addition, the mixture was further stirred for 60 minutes to cause a reaction to proceed. After the temperature of the reaction system was cooled to room temperature, 792 mL of toluene was added to a neutralized solution neutralized with 0.7 g of 25% ammonia water, followed by extraction. The extraction step was repeated twice and 524 g of water was charged. After azeotropic distillation, the residue was cooled to obtain 893 g of a resorcinol-formalin resin (content of resorcinol: about 14%, solid content: 500 g).

Provenance & Evidence