C - Chemistry – Metallurgy – 04 – B
Patent
C - Chemistry, Metallurgy
04
B
C04B 24/18 (2006.01) C04B 24/22 (2006.01) C04B 28/02 (2006.01) C08G 12/34 (2006.01) C08G 12/40 (2006.01)
Patent
CA 2287423
The present invention relates to a process for preparing an aqueous solution of sulfonated melamine-formaldehyde resin, and a cement composition in which the solution and a setting retarder are added to a concrete, a mortar, a cement paste or the like. And the process comprises the following step (A), step (B) and step (C): Step (A): a step of adjusting an aqueous solution containing melamine (a), formaldehyde (b), sulfanilic acid (c) and an alkali substance (d) to (a):(b):(c)=1:2.5- 3.5:0.5-1.5 in molar ratio and its pH to 8.0-13.5, and thereafter heating the aqueous solution at 50-90°C to conduct the reaction until free sulfanilic acid decreases to 40-90 mol% of the amount of sulfanilic acid charged; Step (B): a step of adding an inorganic acid to the reaction liquid obtained in the step (A) to adjust its pH to 6.0-8.0, and thereafter heating the reaction liquid at 50-90° to conduct the reaction until free sulfanilic acid decreases to 20-60 mol% of the amount of sulfanilic acid charged; Step (C): a step of adjusting a pH of the reaction liquid obtained in step (B) to 7.0-13.5.
Nakayama Keisuke
Sudoh Yuhji
Sugiyama Takaichi
Uchida Jun
Borden Ladner Gervais Llp
Nissan Chemical Industries Ltd.
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