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Polycarboxylate-type water reducing agent as well as preparation method and application thereof

A technology of polycarboxylic acid series and water reducing agent, applied in the field of building materials, can solve the problems of high gas content and high reaction temperature of early strength polycarboxylic acid series water reducing agent

Inactive Publication Date: 2018-07-03
SHANGHAI DONGDA CHEM
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The technical problem to be solved by the present invention is to overcome the defects of high gas content and high reaction temperature in the preparation process of the early-strength polycarboxylate water reducer prepared by the synthesis method in the prior art, and to provide a polycarboxylate Water reducing agent and its preparation method and application

Method used

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  • Polycarboxylate-type water reducing agent as well as preparation method and application thereof
  • Polycarboxylate-type water reducing agent as well as preparation method and application thereof
  • Polycarboxylate-type water reducing agent as well as preparation method and application thereof

Examples

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Effect test

Embodiment 1

[0067] (1) Under the stirring state, pre-drop the reducing agent solution into the mixture A for 10 minutes, and then drop the mixture B at the same time; when the dropping time of the mixture B is halfway, add the remaining 0.4 parts of the initiator (persulfuric acid Ammonium);

[0068] Among them, mixture A is prepared by the following steps: add 100 parts of polyether monomer A with a number average molecular weight of 4000 and 100 parts of water into the reaction kettle, and stir evenly; when the temperature of the system reaches 5°C, add 0.4 parts of initiator (ammonium persulfate), initiate reaction, mix to obtain mixture A;

[0069] Mixture B is made by uniformly mixing 12 parts of monomer B (acrylic acid), 4 parts of monomer C (acrylamide), 0.8 parts of chain transfer agent (mercaptoethanol) and 30 parts of water; the dropping time of mixture B is 2h; B is added dropwise at a uniform speed;

[0070] The reducing agent solution is mixed with 0.2 parts of reducing age...

Embodiment 2

[0078] (1) In the stirring state, pre-drop the reducing agent solution to the mixture A for 15 minutes, and then drop the mixture B at the same time; when the addition time of the mixture B is halfway, add the remaining 0.6 parts of the initiator (peroxide hydrogen);

[0079] Wherein, the mixture A is prepared through the following steps: adding 100 parts of polyether monomer A, 4 parts of monomer B (methacrylic acid) and 80 parts of water into the reactor with a number average molecular weight of 6000, and stirring evenly; When the temperature of the system reaches 10°C, add 1.4 parts of initiator (hydrogen peroxide) to initiate the reaction, and mix uniformly to obtain mixture A;

[0080] Mixture B is made by uniformly mixing 16 parts of monomer B (methacrylic acid), 8 parts of monomer C (N-methylolacrylamide), 2 parts of chain transfer agent (mercaptopropionic acid) and 20 parts of water; mixture B The dropping time of the mixture is 4 hours; the dropping speed of the mixt...

Embodiment 3

[0089] (1) In the state of stirring, pre-drop the reducing agent solution into the mixture A for 5 minutes, and then drop the mixture B at the same time; when the dropping time of the mixture B is halfway, add the remaining 0.2 parts of the initiator (persulfuric acid Ammonium);

[0090] Wherein, the mixture A is prepared by the following steps: 100 parts of polyether monomer A with a number average molecular weight of 8000, 1 part of monomer B (acrylic acid) and 43 parts of water are added to the reactor and stirred evenly; when the system temperature When it reaches 30°C, add 0.4 parts of initiator (ammonium persulfate) to initiate the reaction, and mix well to obtain mixture A;

[0091] Mixture B is prepared by uniformly mixing 9 parts of monomer B (acrylic acid), 3 parts of monomer C (2-acrylamide-2-methylpropanesulfonic acid), 0.6 parts of chain transfer agent (thioglycolic acid) and 40 parts of water; The dropping time of the mixture B is 3h; the dropping speed of the m...

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Abstract

The invention discloses a polycarboxylate-type water reducing agent as well as a preparation method and an application thereof. The polycarboxylate-type water reducing agent is prepared from the following raw materials in parts by mass: 100 parts of monomer A, 10-20 parts of liquid-state unsaturated carboxylic acid, 3-8 parts of unsaturated amide, 0.6-2 parts of initiator, 0.15-0.5 part of reducing agent, 0.6-2 parts of chain transfer agent, 8-20 parts of neutralizing agent and 80-150 parts of water. In the water reducing agent disclosed by the invention, through synergistic effect of the components, the surface tension can be adjusted to realize relatively low air entraining performance, bubbles mixed in the gel material are remarkably reduced, the product surface is denser and more beautiful, and the component strength is enhanced; the cement hydration process can be promoted to improve the early strength; and moreover, the dispersing power is enhanced, the water consumption for thegel material is reduced, the particles are dispersed, and the hydration degree is better.

Description

technical field [0001] The invention relates to the field of building materials, in particular to a polycarboxylate water reducer and its preparation method and application. Background technique [0002] Water reducing agent, as an essential component in modern concrete besides cement, sand, stone, water and admixtures, has promoted the development of concrete technology. Polycarboxylate superplasticizers have flexible molecular designability, and can prepare superplasticizer products with different properties such as high slump retention, high water reduction, early strength, retardation, air-entraining or shrinkage reduction, etc., suitable for the preparation of high-strength, Concrete with properties such as ultra-high strength, high fluidity or high durability can meet the diverse needs of contemporary concrete, and has been unanimously praised by the engineering community. At the same time, its rich sources of raw materials and green production process have become a h...

Claims

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Application Information

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IPC IPC(8): C08F283/06C08F220/06C08F220/56C08F220/58C08F2/38C04B24/26C04B24/16C04B103/30
CPCC04B24/165C04B24/2605C08F2/38C08F283/065C04B2103/302C08F220/585C08F220/58
Inventor 董建国王万林罗琼刘洪锦杜辉
Owner SHANGHAI DONGDA CHEM
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