Synthesis and properties of high-performance and good water-soluble melamine-formaldehyde resin

In this article, high-sulfonated melamine-formaldehyde (HSMF) resins were p repared with a sulfite/melamine (S/M1.5) molar ratio. During the sulfonatio n process, the reaction temperature and the added velocity of sodium bisulf ite affecting the properties of the resin were studied. In the condensation stage, where the pH range is 6.0 and the temperature is about 25 degreesC, the condensation time was prolonged above 24 h. The stability and water so lubility of the resin was improved greatly. It is an effective superplastic izer at small dosages of admixture. (C) 2001 John Wiley & Sons, Inc.