Process for the synthesis of highly stable sulfonated melamine-f

Details Process for the synthesis of highly stable sulfonated melamine-f Process for the synthesis of highly stable sulfonated melamine-f

1985-10-16

1987-06-30

Michl, Paul R.

Synthetic resins or natural rubbers -- part of the class 520 ser

Synthetic resins

At least one aryl ring which is part of a fused or bridged...

524 6, 524598, 528254, 528258, C08G 1230

Patent

active

046771590

ABSTRACT:
Stable, water soluble, sulfonated melamine-formaldehyde and sulfonated melamine-urea-formaldehyde resin solutions are prepared in a four stage procedure, wherein (1) melamine or melamine and urea are condensed with formaldehyde in an aqueous medium at a relative low temperature and a pH of 10-13, followed by (2) the addition of a sulfonating agent, such as sodium metabisulfite, and continued reaction without pH adjustment, followed by (3) lowering the temperature of the reaction medium to 40.degree.-60.degree. C., adjusting the pH to 2.5-4 and continuing the reaction for about 5-150 minutes, and finally followed by (4) adjusting the pH to 6.5-9, heating the reaction medium to 70.degree.-100.degree. C. for 30-180 minutes, adjusting the final solids content to a predetermined value, such as 20%, and adjusting the pH to 8-11. The resulting aqueous solutions are suitable for use as superplasticizer additives to hydraulically settable cementitious materials.

REFERENCES:
patent: 3827992 (1974-08-01), Aignesberger
patent: 3870671 (1975-03-01), Aignesberger
patent: 3985696 (1976-10-01), Aignesberger
patent: 4316826 (1982-02-01), Laquerbe
patent: 4430469 (1984-02-01), Burge
patent: 4444945 (1984-04-01), Sheldrick

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