Preparation method for concrete viscosity regulator
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A viscosity regulator and concrete technology, which is applied in the field of concrete admixtures, can solve the problems of uneven internal voids, hardening of the floor, and easy flow of green ecological concrete paste, and achieve the suppression of segregation and bleeding, good compatibility, and inhibition The effect of segregated bleeding
Active Publication Date: 2017-03-08
安徽瑞和新材料有限公司
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[0005] Patent CN201010298314.6 discloses a composite thickener for green ecological concrete and its preparation method. It can solve the problems of easy flow of green ecological concrete slurry, hardening of the bottom plate, uneven internal voids, etc.
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Embodiment 1
[0027] 1) Put 45 parts of acrylamide, 5 parts of acrylic acid and 100 parts of water into the bottom of the kettle, control the temperature at 30°C to 35°C, stir until the acrylamide is fully dissolved, then put in 3.0 parts of hydrogen peroxide, and stir for 10 minutes;
[0028] 2) Evenly add 70 parts of a mixed aqueous solution containing 0.05 parts of mercaptoethanol and 0.20 parts of L-ascorbic acid dropwise for 30 minutes, and slowly stir;
[0029] 3) Stand at constant temperature for 3 hours under the condition of 30℃~35℃;
[0030] 4) After diluting with water to a concentration of 10%, add 0.10 part of polyethylene glycol bis-itaconate, and raise the temperature to 60°C-65°C;
[0031] 5) Add 15 parts of an aqueous solution containing 1.0 part of persulfate dropwise for 1 hour, and slowly stir;
[0032] 6) Keep the temperature at 60℃~65℃ for 3h;
[0033] 7) Cool down to 40°C, add 30% liquid caustic soda to adjust the pH value to 5-6, and discharge to obtain the product...
Embodiment 2
[0035] 1) Put 40 parts of acrylamide, 10 parts of acrylic acid and 100 parts of water into the bottom of the kettle, control the temperature at 30°C to 35°C, stir until the acrylamide is fully dissolved, then put in 3.0 parts of hydrogen peroxide, and stir for 10 minutes;
[0036] 2) Evenly add 70 parts of a mixed aqueous solution containing 0.10 parts of 3-mercaptopropionic acid and 0.20 parts of L-ascorbic acid dropwise for 30 minutes, and slowly stir;
[0037] 3) Stand at constant temperature for 3 hours under the condition of 30℃~35℃;
[0038] 4) After diluting with water to a concentration of 10%, add 0.20 parts of polyethylene glycol bis-itaconate, and raise the temperature to 60°C-65°C;
[0039] 5) Add 20 parts of an aqueous solution containing 2.0 parts of ammonium persulfate dropwise for 1 hour, and slowly stir;
[0040] 6) Keep the temperature at 60℃~65℃ for 3h;
[0041] 7) Cool down to 40°C, add 30% liquid caustic soda to adjust the pH value to 5-6, and discharge ...
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Abstract
The invention discloses a preparation method for a concrete viscosity regulator. The preparation method comprises the following steps: subjecting acrylamide and acrylic acid to copolymerization in an oxidation-reduction system under the condition of 30 DEG C to 35 DEG C, and adding a crosslinking agent polyethylene glycol bisitaconate under the condition of 60 DEG C to 65 DEG C. According to the invention, an acrylamide-acrylic acid copolymer with a high molecular weight is obtained through prepolymerization at a low temperature; the molecular weight of the copolymer is further improved through a reaction by adding the crosslinking agent polyethylene glycol bisitaconate at a high temperature; and the introduction of carboxyl, amide and ester into the molecular structure of the copolymer can guarantee that the copolymer has good hydrophilicity and water-reducing and slump-retaining effects. The concrete viscosity regulator provided by the invention can regulate the workability of a concrete mixture, has viscosity reducing effect at a low mixing amount, has viscosity increasing effect at a high mixing amount, inhibits segregation and bleeding, and has the advantages of good water solubility, convenience in usage, good compatibility with polycarboxylic acid water-reducing agents, etc.
Description
technical field [0001] The invention belongs to the field of concrete admixtures, and in particular relates to a preparation method of a concrete viscosity regulator. Background technique [0002] In the process of modern concrete pouring, high fluidity concrete is often used to improve efficiency, especially for medium and low-grade concrete, the phenomenon of segregation and bleeding of concrete mixture occurs from time to time; and for self-compacting concrete, it is necessary to ensure that it has a suitable Viscous, allowing it to fill the reinforcement uniformly without separation under high flow conditions. Thickeners are usually used to solve the above problems. [0003] Thickeners can improve the working performance and bleeding performance of concrete, improve the anti-segregation stability and filling performance of concrete, and are widely used in self-compacting concrete. The types of thickeners include cellulose water-soluble polymers, bio-glue, glucose or su...
Claims
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