反应详情

A 2-liter separable flask equipped with a thermometer, a reflux condenser, and a stirrer was charged with 480 parts of 50% formalin, 110 parts of phenol, 202 parts of 98% industrial sulfuric acid, and 424 parts of m-xylene. The resulting mixture was allowed to react at 84° C. to 88° C. for 4 hours. After the reaction was completed, the reaction mixture was allowed to stand to separate a resin phase and a sulfuric acid aqueous phase. The resin phase was washed with water 3 times, and then unreacted m-xylene was removed under the conditions of 20 to 30 mmHg and 120° C. to 130° C. for 20 minutes. As a result, 480 parts of a phenol-modified xylene-formaldehyde resin having a viscosity of 1,050 mPa·s (25° C.) were obtained.

1. customA 2-liter separable flask equipped with a thermometer, a reflux condenser, and a stirrer
2. customto react at 84° C. to 88° C. for 4 hours
3. customto separate a resin phase
4. washThe resin phase was washed with water 3 times
5. customunreacted m-xylene was removed under the conditions of 20 to 30 mmHg and 120° C. to 130° C. for 20 minutes
6. customa viscosity of 1,050 mPa·s (25° C.)
7. customwere obtained