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High-water-reducing water reducing agent and preparation method thereof

A water-reducing type and water-reducing agent technology, applied in the field of concrete additives, can solve the problems of high mud content or powder content in sand and gravel, influence of water-reducing rate of water-reducing agent, uneven quality of sand and gravel, etc. Improve the water reduction rate, the water reduction effect is good, and the effect of improving the conversion rate

Inactive Publication Date: 2020-05-01
广东六合新型建材有限公司 +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the existing water reducer is sensitive to the soil and stone powder in the concrete aggregate. When the mud content or powder content in the concrete system is high, it is easy to affect the water reducing rate of the water reducer.
[0004] The above-mentioned existing technical solutions have the following defects: due to the gradual depletion of sand and gravel resources, the shortage and deterioration of sand and gravel resources in various places gradually occur, so that the quality of sand and gravel used to prepare concrete is uneven, and it is easy to make The high mud content or powder content in the sand makes the water reducing rate of the water reducing agent easily affected, so there is still room for improvement

Method used

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  • High-water-reducing water reducing agent and preparation method thereof
  • High-water-reducing water reducing agent and preparation method thereof
  • High-water-reducing water reducing agent and preparation method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0059] A preparation method of a high water reducing type water reducing agent, comprising the following steps:

[0060] S1. Add 3kg of deionized water and 35kg of composition A to a four-neck flask equipped with a stirrer and a thermometer, heat it in a water bath to 45°C, and stir until composition A is completely dissolved to form a premix.

[0061] S2. Keep the temperature in the four-necked flask at 45°C. First, mix and stir 3kg of reducing agent and 1kg of chain transfer agent evenly to form a mixed solution. Add 1kg of initiator to the premix while stirring, and then use a constant flow pump to control the flow rate. And sequentially add 10kg of monomer B and 15kg of monomer C dropwise, and at the same time, add dropwise the mixed solution formed by mixing the reducing agent and the chain transfer agent uniformly, so that the addition of monomer B, monomer C and the mixed solution is completed within 2 hours, and then continue Stir and insulate the reaction for 1.5h.

...

Embodiment 2

[0065] The difference with embodiment 1 is:

[0066] In step S1, the water bath is heated to 53°C.

[0067] In step S2, the temperature in the four-necked flask was kept constant at 53° C., and after adding monomer B, monomer C, reducing agent and the mixed solution, the reaction was stirred and kept for 1.8 h.

[0068] Adjust the pH to 7 in step S3.

[0069] Simultaneously, the consumption of each component of reaction is as follows:

[0070] 5kg of deionized water; 10kg of composition A; 2kg of initiator; 15kg of monomer B; 20kg of monomer C; 5kg of reducing agent; 2kg of chain transfer agent.

Embodiment 3

[0072] The difference with embodiment 1 is:

[0073] In step S1, the water bath is heated to 60°C.

[0074] In step S2, keep the temperature in the four-necked flask at 60° C., add monomer B, monomer C, reducing agent and the mixed solution, stir and keep warm for 2 hours.

[0075] Adjust the pH to 8 in step S3.

[0076] Simultaneously, the consumption of each component of reaction is as follows:

[0077] 4kg of deionized water; 22.5kg of composition A; 3kg of initiator; 12.5kg of monomer B; 17.5kg of monomer C; 4kg of reducing agent; 3kg of chain transfer agent.

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Abstract

The invention relates to the technical field of concrete additives, and relates to a preparation method of a high-water-reducing water reducing agent. The method comprises the following steps: S1, mixing deionized water and a composition A; S2, dropwise adding an initiator, a monomer B, a monomer C, a reducing agent and a chain transfer agent, and performing reacting; and S3, adjusting the pH to 6-8, wherein the cleaning agent comprises the following components in parts by mass: 3-5 parts of deionized water, 10-35 parts of a composition A, 1-3 parts of an initiator, 10-15 parts of a monomer B,15-20 parts of a monomer C, 3-5 parts of a reducing agent and 1-3 parts of a chain transfer agent, the composition A is formed by mixing one or more monomers A, the molecular structure of the monomerA is shown in the specification, R3 is an alkenyl group, the monomer B is any one of acrylic acid, methacrylic acid or ethylacrylic acid, and the monomer C is any one of acrylamide or 2-acrylamide-2-methylpropanesulfonic acid. The preparation method has the effect that the water reducing rate of the prepared water reducing agent is not easily influenced by the mud content and the powder content of the aggregate.

Description

technical field [0001] The invention relates to the technical field of concrete additives, in particular to a high water-reducing water-reducing agent and a preparation method thereof. Background technique [0002] At present, the water reducer is a concrete admixture that can reduce the amount of mixing water while maintaining the slump of the concrete basically unchanged. The water reducing agent can disperse the cement particles after being added to the concrete mixture, which can improve its workability, reduce the unit water consumption, improve the fluidity of the concrete mixture, or reduce the unit cement consumption and save cement. [0003] Most of the existing water reducers are anionic surfactants, including lignosulfonates, naphthalenesulfonate formaldehyde polymers, etc. However, the existing water reducer is sensitive to the soil and stone powder in the concrete aggregate. When the mud content or powder content in the concrete system is high, the water reduci...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08F228/02C08F220/06C08F220/56C08F220/58C08F2/38C04B24/16C04B103/30
CPCC04B24/163C04B2103/302C08F2/38C08F220/56C08F220/58C08F228/02C08F220/06
Inventor 陈集芳黄俊辉贺海量
Owner 广东六合新型建材有限公司
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