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Viscosity reduction type water reducing agent

A water-reducing agent and viscosity-reducing technology, which is applied in the field of water-reducing agents, can solve the problems of insufficient functional strength and complex functional raw materials of polycarboxylate water-reducing agents, achieve good water-reducing performance, simple synthesis method, and improve compressive strength Effect

Pending Publication Date: 2022-04-15
HUNAN XIANFENG BUILDING MATERIAL
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

But the function raw material that this method adopts is complicated, and each functional intensity of the polycarboxylate superplasticizer of synthesis is insufficient

Method used

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Examples

Experimental program
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Effect test

Embodiment 1

[0043] A preparation method of a viscosity-reducing water reducer, comprising the following steps:

[0044] Step 1. Add 8 parts of acrylic acid and 2 parts of 2-methallyl polyoxyethylene ether into the container, stir evenly, and configure a mixed solution;

[0045] Step 2. Add 0.12 parts of thioglycolic acid, 1 part of citric acid and 1 part of hydrogen peroxide to the mixed solution, stir at room temperature 25°C, and the stirring speed is 300r / min; then use a water bath to heat the reaction, and at 75°C, the reaction 3h, finally using 30wt% sodium hydroxide aqueous solution to adjust the pH to 7 to obtain a modified acrylic acid solution;

[0046] Step 3. Add 40 parts of prenol polyoxyethylene ether and 60 parts of water into the four-necked bottle, raise the temperature to 60°C, and prepare a prenol polyoxyethylene ether solution after the solvent is completely dissolved; Add 2 parts of 10wt% ammonium persulfate aqueous solution, 5 parts of modified acrylic acid solution ...

Embodiment 2

[0051] A preparation method of a viscosity-reducing water reducer, comprising the following steps:

[0052] It is basically the same as Example 1, the only difference is:

[0053] The preparation method of described modified N,N-dimethyl (methacryloyloxyethyl) aminopropanesulfonic acid inner salt is as follows, and the parts are parts by weight:

[0054] S1. Add 25 parts of N,N-dimethyl (methacryloyloxyethyl) aminopropanesulfonic acid inner salt and 50 parts of methanol into a sealed container, stir evenly, and prepare a mixed solution;

[0055] S2. Add 3 parts of tetraethyl orthosilicate dropwise to the mixed solution at a rate of 0.8mL / min; then add 1 part of potassium tert-butoxide, vacuumize the reaction vessel, heat the water bath to 60°C, and The reaction was carried out with a stirring speed of 300r / min and a stirring time of 24h; the obtained precipitate was filtered; and then dried in vacuum at 25°C to obtain modified N,N-dimethyl (methacryloyloxyethyl ) inner salt ...

Embodiment 3

[0057] A preparation method of a viscosity-reducing water reducer, comprising the following steps:

[0058] It is basically the same as Example 1, the only difference is:

[0059] The preparation method of described modified N,N-dimethyl (methacryloyloxyethyl) aminopropanesulfonic acid inner salt is as follows, and the parts are parts by weight:

[0060] S1. Add 25 parts of N,N-dimethyl (methacryloyloxyethyl) aminopropanesulfonic acid inner salt and 50 parts of methanol into a sealed container, stir evenly, and prepare a mixed solution;

[0061] S2. Add 7 parts of 3-hydroxyl-1-methyltetrahydropyrrole dropwise to the mixed solution at a rate of 0.8 mL / min; then add 1 part of potassium tert-butoxide, vacuumize the reaction vessel, and heat the water bath to 60 ℃, reacted under stirring conditions, the stirring speed was 300r / min, and the stirring time was 24h; the obtained precipitate was filtered; and then dried in vacuum at 25°C to obtain the modified N,N-dimethyl (formazan ...

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Abstract

The invention discloses a viscosity reduction type water reducing agent. According to the viscosity reduction type water reducing agent, acrylic acid, 2-methyl allyl polyoxyethylene ether, mercaptoacetic acid, citric acid and hydrogen peroxide react to prepare a modified acrylic acid solution, then isopentenol polyoxyethylene ether is used as a main chain substance, ammonium persulfate is added to react with the modified acrylic acid solution and a hydroxyethyl acrylate aqueous solution, and the viscosity reduction type water reducing agent is obtained. The preparation method comprises the following steps: firstly, preparing silicon carbide nanowhiskers, then adding N, N-dimethyl (methacryloyloxyethyl) aminopropanesulfonic acid inner salt modified by 3-hydroxy-1-methyltetrahydropyrrole and tetraethoxysilane for polymerization, and finally adding the silicon carbide nanowhiskers subjected to heat treatment to prepare the viscosity-reducing water reducer. Compared with the prior art, the viscosity reduction type water reducing agent prepared by the invention has excellent viscosity reduction effect and water reducing effect, and can effectively enhance the fluidity of slurry and the compressive strength of concrete.

Description

technical field [0001] The invention relates to the technical field of water reducers, in particular to a viscosity-reducing water reducer. Background technique [0002] With the development of the times and the rapid development of construction technology, the past pumped concrete, self-compacting concrete, and shotcrete can no longer meet the current production needs. The development of new technologies such as high-strength and high-performance concrete has higher functional requirements for concrete. Concrete should have high strength, low heat of hydration, low cost, light weight, sound insulation and high durability. In the context of further accelerated urbanization, the demand for concrete is increasing, and the quality requirements for cement and concrete are also getting higher and higher. In recent years, concrete technology has entered a new development bottleneck. [0003] Water reducers play an important role in reducing cement consumption, enhancing concrete ...

Claims

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Application Information

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IPC IPC(8): C04B24/16C04B24/28C08F283/06C08F220/06C08F220/20C08F285/00C08F220/38C04B103/30
Inventor 段平娥张召伟
Owner HUNAN XIANFENG BUILDING MATERIAL
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