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Method for preparing early strength type polycarboxylic acid water-reducing agent

A polycarboxylic acid-based and water-reducing agent technology is applied in the field of concrete admixtures in building materials, which can solve the problems of large amount of water-reducing agent, poor product stability of water-reducing agent, influence of product adaptability, etc., and achieves convenient preparation process. , The effect of good product stability and high early strength

Active Publication Date: 2012-05-02
NANJING RUIDI HIGH TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Using the method of compounding to improve the early strength of concrete, the amount of water reducing agent is generally large, and the stability of the compounded water reducing agent product is relatively poor, and the adaptability of the product will also be affected

Method used

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  • Method for preparing early strength type polycarboxylic acid water-reducing agent
  • Method for preparing early strength type polycarboxylic acid water-reducing agent

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] 1. The composition and ratio of the monomers used are as follows:

[0030] 1) Modified polyoxyalkylene ethers with unsaturated double bonds, accounting for 85% of the total weight of the monomers, and its general structural formula is

[0031]

[0032] In the general formula, AO is an oxyalkylene group with 2 carbon atoms, n=50;

[0033] 2) Acrylic acid, accounting for 7% of the total weight of monomers;

[0034] 3) Sodium propenyl sulfonate, accounting for 5% of the total weight of the monomer;

[0035] 4) Acrylamide, accounting for 3% of the total weight of monomers.

[0036] 2. The preparation process is as follows:

[0037] 1) Add the modified polyoxyalkylene ether and sodium propylene sulfonate into the reaction kettle according to the above ratio, add deionized water, make the concentration of the monomer mixed aqueous solution in the kettle be 50%, and slowly raise the temperature to 65°C;

[0038] 2) Add the mixed solution of acrylic acid, acrylamide and ...

Embodiment 2

[0042] 1. The composition and ratio of the monomers used are as follows:

[0043] 1) Modified polyoxyalkylene ethers with unsaturated double bonds, accounting for 90% of the total weight of the monomers, and its general structural formula is

[0044]

[0045] In the general formula, AO is an oxyalkylene group with 2 carbon atoms, n=70;

[0046] 2) Acrylic acid, accounting for 6% of the total weight of monomers;

[0047] 3) Sodium propenyl sulfonate, accounting for 2% of the total weight of the monomer;

[0048] 4) Acrylamide, accounting for 2% of the total weight of monomers.

[0049] 2. The preparation process is as follows:

[0050] The preparation process is completely the same as in Example 1. The inventive product EPC-2 was obtained.

Embodiment 3

[0052] 1. The composition and ratio of the monomers used are as follows:

[0053] 1) Modified polyoxyalkylene ethers with unsaturated double bonds, accounting for 80% of the total weight of monomers, and its general structural formula is

[0054]

[0055] In the general formula, AO is a mixture of oxyalkylene groups with 2 to 4 carbon atoms, n=20;

[0056] 2) Acrylic acid, accounting for 15% of the total weight of monomers;

[0057] 3) Sodium vinyl sulfonate, accounting for 5% of the total monomer weight;

[0058] 4) Acrylamide, accounting for 5% of the total weight of monomers.

[0059] 2. The preparation process is as follows:

[0060] 1) Add the modified polyoxyalkylene ether and sodium vinyl sulfonate into the reaction kettle according to the above ratio, add deionized water, make the concentration of the monomer mixed aqueous solution in the kettle be 50%, and slowly raise the temperature to 50°C;

[0061] 2) Add the mixed solution of acrylic acid, acrylamide and mer...

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Abstract

The invention relates to a method for preparing an early strength type polycarboxylic acid water-reducing agent, belonging to the field of concrete admixtures. The water-reducing agent is obtained by carrying out solution copolymerization of four monomers, namely modified polyoxyvinyl ether containing unsaturated double bond, (methyl) crylic acid, sulfonate containing unsaturated double bond and acrylamide by initiating through a radical in the presence of a molecular weight regulator. A certain amount of sulfonic acid group and amide group are introduced in the molecular structure of the polymer. The cement hydration is enhanced by reducing the content of a carboxyl group and controlling the polymerization degree of the polymer, so that the early strength effect is achieved. The polycarboxylic acid water-reducing agent prepared by the method disclosed by the invention has the characteristics of being high in water-reducing rate, high in early strength, good in product stability, convenient in preparation process and the like. The polycarboxylic acid water-reducing agent is applied to constructing high doped mineral admixture concrete in the ultra-low temperature condition, producing a precast concrete component, etc.

Description

technical field [0001] The invention belongs to the field of concrete admixture in building materials. Specifically, it relates to a preparation method of an early-strength polycarboxylate water reducer. Background technique [0002] Polycarboxylate superplasticizers have attracted more and more attention from researchers at home and abroad because of their advantages such as low dosage, high water reducing rate, and good slump retention performance. In recent years, the gap between China and foreign countries in the research level of polycarboxylate superplasticizers is gradually narrowing. However, the variety of polycarboxylate superplasticizers is relatively single, and the multifunctional research on the performance of polycarboxylate superplasticizers from the design of polymer molecular structure is still in its infancy, such as early-strength polycarboxylate The synthesis and development of water reducers, low air-entraining polycarboxylate water reducers, and low ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08F290/06C08F228/02C08F220/06C08F220/56C04B24/16C04B103/30
Inventor 唐修生黄国泓祝烨然高欣欣季海
Owner NANJING RUIDI HIGH TECH
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