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Efficient concrete water reducer and preparation method thereof

A concrete water-reducing agent and high-efficiency technology, applied in the field of high-efficiency concrete water-reducing agent and its preparation, can solve the problems of low slump loss, high water-reducing rate, poor compoundability, etc., and achieve low slump loss and cost Low, high bleed air effect

Active Publication Date: 2015-04-22
SHANDONG TAIHE WATER TREATMENT TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Its dosage is low (the general dosage is 0.15%~0.25% of the weight of the cementitious material, which is only 1 / 4 of the naphthalene series), and the water reducing rate is high (the water reducing rate can generally reach 25%~40%); concrete mixing It has the advantages of good fluidity and flow retention, low slump loss, and great potential for concrete reinforcement. However, due to its high cost and poor compoundability with other concrete admixtures, its popularization is limited.

Method used

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  • Efficient concrete water reducer and preparation method thereof
  • Efficient concrete water reducer and preparation method thereof
  • Efficient concrete water reducer and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] A multifunctional concrete water reducing agent of the present invention has the following structure:

[0024]

[0025] In the formula, R is a lignin structure, n is an integer of 2-10, m is an integer of 2-10, q is an integer of 2-10, and p is an integer of 5-20.

[0026] Synthesized by the following steps:

[0027] (1) Add maleic anhydride and sodium lignosulfonate to the reaction kettle at a mass ratio of 1:100, turn on the heating and stirring, heat to 120°C, add maleic anhydride and sodium lignosulfonate with a total weight of 0.5 % concentrated sulfuric acid, keep the temperature at 120±5°C, and react for 7 hours.

[0028] (2) Add the above-mentioned maleic anhydride graft modified lignosulfonate and acrylic acid, polyoxyethylene monomethyl ether acrylate into the reaction kettle according to the ratio of 1:1:1 by mass, add pure water as solvent, and stir Heat to 80°C, add dropwise a 10% azobisisobutyl ether hydrochloride aqueous solution with 0.5% of the tot...

Embodiment 2

[0030] A multifunctional concrete water reducing agent of the present invention has the following structure:

[0031]

[0032] In the formula, R is a lignin structure, n is an integer of 2-10, m is an integer of 2-10, q is an integer of 2-10, and p is an integer of 5-20.

[0033] Synthesized by the following steps:

[0034] (1) Add maleic anhydride and sodium lignosulfonate into the reaction kettle according to the mass ratio of 1:200, turn on the heating and stirring, heat to 130°C, add maleic anhydride and sodium lignosulfonate with a total weight of 0.8 % concentrated sulfuric acid, keep the temperature at 130±5°C, and react for 5 hours.

[0035] (2) Add maleic anhydride graft-modified lignosulfonate, acrylic acid and polyoxyethylene monomethyl ether acrylate to the reaction kettle according to the mass ratio of 1:0.5:0.5, add pure water as solvent, and stir Heat to 80°C, add dropwise 10% benzoyl peroxide aqueous solution with 1.0% of the total monomer mass, dropwise f...

Embodiment 3

[0037] A multifunctional concrete water reducing agent of the present invention has the following structure:

[0038]

[0039] In the formula, R is a lignin structure, n is an integer of 2-10, m is an integer of 2-10, q is an integer of 2-10, and p is an integer of 5-20.

[0040] Synthesized by the following steps:

[0041] (1) Add maleic anhydride and sodium lignosulfonate to the reaction kettle at a mass ratio of 1:50, turn on the heating and stirring, heat to 100°C, add maleic anhydride and sodium lignosulfonate with a total weight of 1.0 % of p-toluenesulfonic acid, keep the temperature at 100±5℃, and react for 5h.

[0042] (2) Add maleic anhydride graft-modified lignosulfonate, acrylic acid and polyoxyethylene monomethyl ether acrylate to the reaction kettle according to the mass ratio of 1:1.5:1, add pure water as solvent, and stir Heat to 70°C, add dropwise 10% ammonium persulfate aqueous solution with 1.2% total monomer mass, dropwise addition is completed after 2...

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Abstract

The invention provides an efficient concrete water reducer and a specific preparation method thereof. The preparation method comprises the following specific steps of grafting and modifying through sodium lignin sulfonate and maleic anhydride, then copolymerizing with crylic acid and polyoxyethylene monomethyl ether acrylate so as to obtain an intramolecularly compounded efficient concrete water reducer product with an anion structure and a nonionic structure. The concrete water reducer has prominent advantages that the amount of admixture is less and is 0.2-0.5% of the weight of binding material, the decrement rate is high and is more than or equal to 35%, has good enhancing effect on concrete, has large gas generating amount and uniform bubbles, does not react with aggregate due to low alkalinity, does not erode the passive film on the surface of a rebar due to low content of chlorine. The raw material of the concrete water reducer adopts waste residue of papermaking, so that the concrete water reducer has low cost and good degradability, and no harmful contaminants are generated and left in the whole production process.

Description

technical field [0001] The invention belongs to the field of concrete admixtures, and relates to a high-efficiency concrete water reducer and a preparation method thereof. Background technique [0002] So far, the development of water reducers has gone through three stages: the first generation of ordinary water reducers represented by lignosulfonate, the second generation of high-efficiency water reducers represented by naphthalene series, and At present, the third-generation high-performance water reducer stage represented by polycarboxylic acid series. The water-reducing effect of lignosulfonate is general. At present, the water-reducing agent varieties in my country are still dominated by the second-generation naphthalene series products, which have high alkalinity, and formaldehyde and other harmful raw materials are used in the production process. After being formulated into concrete, harmful substances such as formaldehyde and naphthalene remaining in the water reduci...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08F285/00C04B24/16C04B103/30
Inventor 刘强程终发刘全华万振涛王东宇
Owner SHANDONG TAIHE WATER TREATMENT TECH CO LTD
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