반응 #77840

반응 방정식

NaOH

oxygen

formalin

melamine

→

melamine-formaldehyde

용매

water

water

water

water

water

반응 조건

후처리

1. 1
   온도heating it
2. 2
   온도to reflux temperature
3. 3
   workup.ADDITIONcan be added at 20° C. to 1 g of resin before the resin

실험 절차

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.

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