A kind of preparation method of branched chain type aliphatic water reducing agent with high water reducing rate
An aliphatic water-reducing agent and high water-reducing rate technology, applied in the field of preparation of branched-chain aliphatic water-reducing agent, can solve the problems of easy bleeding, low water-reducing rate, poor slump retention performance, etc.
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Embodiment 1
[0018] In terms of parts by mass, add 60 parts of sodium sulfite and 220 parts of water into the reactor, stir and dissolve, add liquid caustic soda to adjust the pH value of the solution to 13, add 55 parts of acetone dropwise, and complete the dropwise addition within 0.5 hours. Control the reaction temperature to 50 ℃, keep warm for 0.5 hours.
[0019] Add 170 parts of formaldehyde dropwise within 1.5 hours, and control the temperature to ≤85°C.
[0020] After the dropwise addition, add 18 parts of isobutylene polyoxyethylene ether HPEG-2400 mixed with 100 parts of water, and mix 3 parts of tert-butyl hydroperoxide / hangbai block with 40 parts of water, Add dropwise to the system within 1 hour, keep warm for 2 hours, and cool to room temperature to obtain the product.
Embodiment 2
[0022] In terms of parts by mass, add 40 parts of sodium sulfite, 10 parts of sodium metabisulfite and 220 parts of water into the reaction kettle, stir and dissolve, add liquid caustic soda to adjust the pH value of the solution to 13, add 60 parts of acetone dropwise, and complete the dropwise addition within 0.5 hours. Control the reaction temperature to 45° C. and keep it warm for 0.5 hours.
[0023] Add 180 parts of formaldehyde dropwise within 1.5 hours, and control the temperature to ≤85°C.
[0024] Add 10 parts of isobutylene polyoxyethylene base ether HPEG-2400 and 5 parts of isobutylene polyoxyethylene base ether TPEG1200 and 100 parts of water preparation mixture, and 3 parts of potassium persulfate / ferrous chloride and 40 parts A mixed solution made of 100% water was added dropwise to the system within 1 hour, kept warm for 3 hours, and cooled to room temperature to obtain the product.
Embodiment 3
[0026] In terms of parts by mass, add 40 parts of sodium metabisulfite and 220 parts of water in the reactor, stir and dissolve, add liquid caustic soda to adjust the pH value of the solution to 13, add 55 parts of acetone dropwise, and complete the dropwise addition within 0.5 hours. 50°C, keep warm for 0.5 hours.
[0027] Add 170 parts of formaldehyde dropwise within 1.5 hours, and control the temperature to ≤85°C.
[0028] Dropping finishes, adds the mixed solution that 20 parts of isopentenyl polyoxyethylene base ethers TPEG2400 and the water preparation of 100 parts, and the mixed solution that 3 parts of potassium persulfate / ferrous chloride and 40 parts of water are made, in 1 Add it dropwise to the system within hours, keep it warm for 2.5 hours, and cool to room temperature to obtain the product.
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