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Water‐soluble sulfonated amino‐formaldehyde resins. I. Melamine resins, synthesis
Author(s) -
AbsiHalabi M.,
Lahalih S. M.,
AlKhaled T.
Publication year - 1987
Publication title -
journal of applied polymer science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.575
H-Index - 166
eISSN - 1097-4628
pISSN - 0021-8995
DOI - 10.1002/app.1987.070330830
Subject(s) - melamine , formaldehyde , melamine resin , sulfite , molar ratio , synthetic resin , chemistry , molar mass distribution , polymer chemistry , condensation polymer , organic chemistry , polymer , catalysis , coating
The procedure for preparing sulfonated melamine formaldehyde resins and the factors affecting it were investigated. A four‐step procedure was developed which results in reproducible watersoluble stable resins. The reactions that take place in the four steps are hydroxymethylation, sulfonation of the methylolmelamine intermediate, low pH condensation, and high pH rearrangement reaction. The reaction and the resins produced were found to be very sensitive to pH, temperature, sulfite/melamine, and formaldehyde/melamine molar ratios. The apparent molecular weight distribution of selected samples was also determined.