反应详情

A melam-containing melamine-formaldehyde solution was prepared by dissolving 1113 g of multicrystalline melamine according to the invention (melam content=2 wt. %; oxygen-containing components=0.4 wt. %; specific surface area=1.3 m2/g; color=14 APHA) in 1589 g of a 30% formalin solution and 272 g water, the pH of which had been adjusted to 9.0 with 2 N NaOH, and then heating it to reflux temperature. After 87 minutes a water tolerance of 1.0 (g water/g resin) was reached. The water tolerance is the amount of water in gram that can be added at 20° C. to 1 g of resin before the resin turns turbid.

1. temperatureheating it
2. temperatureto reflux temperature
3. additioncan be added at 20° C. to 1 g of resin before the resin