Preparation method for low-bleeding water aliphatic high-efficiency water reducing agent
A high-efficiency water-reducing agent, aliphatic technology, applied in the field of preparation of low-bleeding aliphatic high-efficiency water-reducing agent, can solve the problems of easy bleeding of concrete, lack of systematic research on synthesis process, yellowing of slurry, etc., and achieve high Water reduction effect, increase in molecular weight, effect of low bleeding performance
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Embodiment 1
[0019] In terms of parts by mass, add 50 parts of sodium dithionite and 60 parts of water to the reaction kettle A, stir to dissolve, drop 70 parts of acetone, and complete the dropwise addition within 0.5 hours, and control the reaction temperature to 30°C. After the dropwise addition, 170 parts of formaldehyde and 10 parts of methylal were added to obtain the mixed solution I. Mix 2 parts of ammonium persulfate and 30 parts of water to make mixture II.
[0020] In reactor B, add 35 parts of sodium dithionite and 60 parts of water, control the reaction temperature at 60°C, add the mixed solution I dropwise, and finish the dropwise addition within 1 hour. The temperature was raised to 90°C, and the mixed solution II was added dropwise, and the addition was completed within 0.5 hours. Add 1 part of rosin and keep warm at this temperature for 3 hours. After cooling to room temperature, the product was obtained.
Embodiment 2
[0022] In terms of parts by mass, add 40 parts of sodium sulfite and 60 parts of water to reactor A, stir to dissolve, drop 80 parts of acetone, and complete the dropwise addition within 0.7 hours, and control the reaction temperature to 45°C. After the dropwise addition, 180 parts of formaldehyde and 14 parts of methylal were added to obtain the mixed solution I. Mix 5 parts of ammonium persulfate and 30 parts of water to make mixed liquid II.
[0023] In reactor B, add 30 parts of sodium sulfite and 60 parts of water, control the reaction temperature to 70°C, add the mixed solution I dropwise, and finish the dropwise addition within 2 hours. The temperature was raised to 93°C, and the mixed solution II was added dropwise, and the addition was completed within 0.5 hours. Add 1 part of rosin and keep warm at this temperature for 1 hour. After cooling to room temperature, the product was obtained.
Embodiment 3
[0025] In parts by mass, 50 parts of sodium bisulfite and 60 parts of water were added to the reaction kettle A, stirred and dissolved, and 60 parts of acetone was dropped, and the addition was completed within 0.5 hours, and the reaction temperature was controlled at 40°C. After the dropwise addition, 190 parts of formaldehyde and 18 parts of methylal were added to obtain the mixed solution I. Mix 3 parts of potassium persulfate and 30 parts of water to make mixture II.
[0026] In reactor B, add 40 parts of sodium bisulfite and 60 parts of water, control the reaction temperature at 65°C, add the mixed solution I dropwise, and finish the dropwise addition within 1.5 hours. The temperature was raised to 95°C, and the mixed solution II was added dropwise, and the addition was completed within 0.5 hours. Add 2 parts of rosin and keep warm at this temperature for 2 hours. After cooling to room temperature, the product was obtained.
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