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High-early-strength polycarboxylate water reducer and preparation method thereof

A high-early-strength, polycarboxylic acid technology, applied in the field of concrete admixtures, can solve the problems of restricting the application of polycarboxylate superplasticizers, and achieve the effect of stable product performance and strong adaptability

Inactive Publication Date: 2013-11-20
湖南加美乐素新材料股份有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, there has been a lack of research on the synthesis of early-strength polycarboxylate superplasticizers by molecular design for a long time, which greatly limits the application of polycarboxylate superplasticizers in ordinary precast concrete and high-strength pipe pile concrete.

Method used

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  • High-early-strength polycarboxylate water reducer and preparation method thereof
  • High-early-strength polycarboxylate water reducer and preparation method thereof
  • High-early-strength polycarboxylate water reducer and preparation method thereof

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Effect test

Embodiment 1

[0025] In an embodiment of the present invention, a method for preparing a high early strength polycarboxylate water reducer comprises the following steps:

[0026] (1) Esterification: Use acrylic acid and alcohol amine at 120 degrees, use sulfuric acid as a catalyst, hydroquinone as a polymerization inhibitor, and the molar ratio of acrylic acid: alcohol amine: sulfuric acid: hydroquinone is 1:1: 0.03:0.005, esterified for 6h to obtain acrylated alcoholamine with unsaturated bonds;

[0027] (2) Polymerization: Put 120.00 parts of methallyl polyoxyethylene ether with a molecular weight of 2400 and some water into a reaction vessel, raise the temperature, stir at a temperature of 70±5°C to completely dissolve the reactants, and then add Add 10.80 parts of acrylic acid, 6.33 parts of sodium methacryl sulfonate, 5.33 parts of acrylamide, 5.01 parts of acrylated alkanolamine in the container, and then add dropwise 93.00 parts of ammonium persulfate solution with a mass percentage ...

Embodiment 2

[0030] In an embodiment of the present invention, a method for preparing a high early strength polycarboxylate water reducer comprises the following steps:

[0031] (1) Esterification: Use acrylic acid and alcohol amine at 120 degrees, use sulfuric acid as a catalyst, hydroquinone as a polymerization inhibitor, and the molar ratio of acrylic acid: alcohol amine: sulfuric acid: hydroquinone is 1:1: 0.03:0.005, esterified for 6h to obtain acrylated alcoholamine with unsaturated bonds;

[0032] (2) Polymerization: put 120.00 parts of methallyl polyoxyethylene ether with a molecular weight of 2400 and some water into a reaction vessel, raise the temperature, stir at a temperature of 80±5°C to completely dissolve the reactants, and then add Add 10.80 parts of acrylic acid, 6.33 parts of sodium methacryl sulfonate, 5.33 parts of acrylamide, 5.01 parts of acrylated alkanolamine in the container, and then add dropwise 93.00 parts of ammonium persulfate solution with a mass percentage ...

Embodiment 3

[0035] In an embodiment of the present invention, a method for preparing a high early strength polycarboxylate water reducer comprises the following steps:

[0036] (1) Esterification: Use acrylic acid and alcohol amine at 120 degrees, use sulfuric acid as a catalyst, hydroquinone as a polymerization inhibitor, and the molar ratio of acrylic acid: alcohol amine: sulfuric acid: hydroquinone is 1:1: 0.03:0.005, esterified for 6h to obtain acrylated alcoholamine with unsaturated bonds;

[0037] (2) Polymerization: 120.00 parts of methallyl polyoxyethylene ether with a molecular weight of 2400 and some water, put it into a reaction container, heat up, stir at a temperature of 70±5°C to completely dissolve the reactants, and then pour into the container Add 10.80 parts of acrylic acid, 5.1 parts of sodium methacrylic sulfonate, 6.2 parts of acrylamide, 7.0 parts of acrylated alcoholamine, and then dropwise add 93.00 parts of ammonium persulfate solution with a mass percentage of 5%...

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Abstract

The invention discloses a high-early-strength polycarboxylate water reducer and a preparation method thereof. The high-early-strength polycarboxylate water reducer is a liquid, and has a solid content of 40%. The water reducer containing an esterified alcohol amine group, a sulfonic group, an amido group, a carboxyl group and a methylallyl polyoxyethylene ether side chain is prepared through polymerizing monomers comprising methylallyl polyoxyethylene ether, acrylamide, sodium methylallyl sulfonate, acrylic acid or methacrylic acid, acrylated amine and the like under the action of a molecular weight chain initiator and a chain transferring agent, and neutralizing. The high-early-strength polycarboxylate water reducer has the advantages of low alkali content, high water reduction rate, short coagulation time, suitableness for the construction of prefabricated components, pile tubes, duct pieces and bridges, simple production technology, easily controlled reaction condition, and no environmental pollution.

Description

technical field [0001] The invention belongs to the field of concrete admixtures, in particular to a high-early-strength polycarboxylate water-reducer and a preparation method thereof. Background technique [0002] Polycarboxylate superplasticizer has low dosage, high water reducing rate (25%~45%), good workability of fresh concrete, good slump retention ability, small hardening shrinkage of concrete, low alkali, no chlorine, no Formaldehyde is known as a high-performance water reducer due to its clean and environmentally friendly properties. The early strength agent is an admixture that can accelerate the hydration of cement and improve the early strength of concrete without significantly affecting the later strength. The current early strength agent itself has no water reducing rate, and the dosage is relatively large (1% to 2%). The polycarboxylate superplasticizer with early strength function can effectively solve the problems of low early strength and concrete freezin...

Claims

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Application Information

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IPC IPC(8): C04B24/16C08F283/06C08F220/56C08F228/02C08F220/36C04B103/30
Inventor 廖声金王伟胡铁刚
Owner 湖南加美乐素新材料股份有限公司
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