A kind of preparation method of high solid content ether type high water-reducing polycarboxylate water-reducer
A high-solid content, water-reducing technology, used in the field of concrete admixtures, can solve the problems of hindered rearrangement of functional groups and high viscosity, and achieve the effects of no three-waste emissions, lower prices, and no formaldehyde content.
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Embodiment 1
[0028] A preparation method of high solid content ether type high water-reducing polycarboxylate water-reducer, comprising the following steps:
[0029] (1) Add 800g of isopentenol polyoxyethylene ether with a molecular weight of 2400 and 80g of distilled water into a 2000mL reaction kettle, turn on the stirrer at a stirring speed of 240r / min, and heat to 70°C with an electric heating mantle until the bottom material dissolves into a homogeneous transparent solution.
[0030] (2) Take out the electric heating mantle, cool the material at the bottom of the kettle to 35°C with an ice-water bath, add 20g of chain transfer agent solution to the bottom of the kettle, a mixed solution prepared by 10g of sodium hypophosphite and 10g of water; Add 14g of initiator A solution, a mixed solution prepared by 4g of ammonium persulfate and 10g of water; after stirring for 5min, add dropwise the monomer solution for 3h and the initiator B solution for 3.5h; wherein the monomer solution consi...
Embodiment 2
[0032] A preparation method of high solid content ether type high water-reducing polycarboxylate water-reducer, comprising the following steps:
[0033] (1) Add 800g of isopentenol polyoxyethylene ether with a molecular weight of 3000 and 120g of distilled water to a 2000mL reaction kettle, turn on the agitator at a stirring speed of 260r / min, and heat to 65°C with an electric heating mantle until the material at the bottom of the kettle is dissolved into a homogeneous transparent solution.
[0034] (2) Take out the electric heating mantle, cool the material at the bottom of the kettle to 30°C with an ice-water bath, add 23.33g of chain transfer agent solution to the bottom of the kettle, a mixed solution prepared by 13.33g of sodium hypophosphite and 10g of water; Add 15.5g of initiator A solution to the bottom of the kettle, a mixed solution prepared from 5.5g of ammonium persulfate and 10g of water; after stirring for 5min, add dropwise monomer solution for 2.5h and initiat...
Embodiment 3
[0036] A preparation method of high solid content ether type high water-reducing polycarboxylate water-reducer, comprising the following steps:
[0037] (1) Add 800g of isopentenol polyoxyethylene ether with a molecular weight of 2400 and 100g of distilled water to 2000mL, turn on the stirrer, stir at a speed of 200r / min, and heat it to 80°C with an electric heating mantle until the bottom material dissolves into a uniform transparent solution.
[0038] (2) Take out the electric heating mantle, cool the material at the bottom of the kettle to 40°C with an ice-water bath, add 14.3g of chain transfer agent solution to the bottom of the kettle, a mixed solution prepared by 4.3g of sodium methacrylate and 10g of water; after 10min , add 16g of initiator A solution to the bottom of the kettle, a mixed solution prepared by 6g of potassium persulfate and 10g of water; after stirring for 5min, dropwise add the monomer solution for 1.5h, and the initiator B solution for 3h10min; wherei...
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