Room-temperature preparation method for high-efficiency polycarboxylic acid water reducing agent

A technology of polycarboxylate and water reducer, which is applied in the field of room temperature preparation of high-efficiency polycarboxylate water reducer, can solve the problems of long reaction time and low product conversion rate, and achieve improved conversion rate, simple preparation process and wide application range wide effect

Active Publication Date: 2015-03-25
ANHUI XIN SOLID ENVIRONMENTAL CO LTD
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  • Abstract
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Problems solved by technology

[0003] Chinese patent (CN103275280A) discloses a normal temperature synthesis method of polycarboxylic acid type high slump water reducer, using unsaturated polyether and unsaturated carboxylic acid as raw materials, and through the establishment of redox system, polycarboxylic acid is synthesized at room temperature Type water reducing agent, but the conversion rate of the product of this method is low, and the reaction time is long

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] A high-efficiency polycarboxylate water reducer is composed of the following raw materials in parts by weight:

[0024] Primer: methallyl polyoxyethylene ether: 280, 30%H 2 o 2 : 2.6, deionized water: 280;

[0025] Solution A: AA: 40, mercaptopropionic acid: 1.2, deionized water: 65;

[0026] Solution B: sodium formaldehyde sulfoxylate: 1.25, deionized water: 165.

[0027] A preparation method of high-efficiency polycarboxylate water-reducer: under room temperature, solution A is added dropwise to the bottom liquid for 1 hour, and solution B is added dropwise to the bottom liquid for 1.5 hours; After the dropwise addition is completed, keep warm and continue to react for 30 minutes, then add 22-30 parts by weight of an aqueous sodium hydroxide solution with a mass concentration of 32% to adjust the pH value to 6-7, and continue stirring for 20 minutes to obtain the high-efficiency polycarboxylic acid Water reducing agent.

Embodiment 2

[0029] A high-efficiency polycarboxylate water reducer is composed of the following raw materials in parts by weight:

[0030] Primer: methallyl polyoxyethylene ether: 293, 30%H 2 o 2 : 3.0, deionized water: 300;

[0031] Solution A: AA: 43.5, mercaptopropionic acid: 1.45, deionized water: 75;

[0032] Solution B: sodium formaldehyde sulfoxylate: 1.5, deionized water: 170.

[0033] A preparation method of high-efficiency polycarboxylate water-reducer: under room temperature, solution A is added dropwise to the bottom liquid for 1 hour, and solution B is added dropwise to the bottom liquid for 1.5 hours; After the dropwise addition is completed, keep warm and continue to react for 30 minutes, then add 22-30 parts by weight of an aqueous sodium hydroxide solution with a mass concentration of 32% to adjust the pH value to 6-7, and continue stirring for 20 minutes to obtain the high-efficiency polycarboxylic acid Water reducing agent.

Embodiment 3

[0035] A high-efficiency polycarboxylate water reducer is composed of the following raw materials in parts by weight:

[0036] Primer: methallyl polyoxyethylene ether: 306, 30%H 2 o 2 : 3.56, deionized water: 315;

[0037] Solution A: AA: 46.8, mercaptopropionic acid: 1.7, deionized water: 88;

[0038] Solution B: sodium formaldehyde sulfoxylate: 1.63, deionized water: 182.

[0039] A preparation method of high-efficiency polycarboxylate water-reducer: under room temperature, solution A is added dropwise to the bottom liquid for 1 hour, and solution B is added dropwise to the bottom liquid for 1.5 hours; After the dropwise addition is completed, keep warm and continue to react for 30 minutes, then add 22-30 parts by weight of an aqueous sodium hydroxide solution with a mass concentration of 32% to adjust the pH value to 6-7, and continue stirring for 20 minutes to obtain the high-efficiency polycarboxylic acid Water reducing agent.

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Abstract

The invention relates to the technical field of building material admixtures, in particular to a room-temperature preparation method for a high-efficiency polycarboxylic acid water reducing agent. The preparation method adopts methyl allyl polyethenoxy ether and acrylic acid as reactive monomers, and adopts hydrogen peroxide as an oxide agent and sodium formaldehyde sulfoxylate as a reducing agent to build an oxidation-reduction system. The specific synthetic method comprises the following steps: adopting methyl allyl polyethenoxy ether, hydrogen peroxide and deionized water as a base solution; dropwise adding a water solution A of acrylic acid and a chain transferring agent, and a water solution B of sodium formaldehyde sulfoxylate; enabling radical polymerization reaction at room temperature. The preparation method can be carried out for synthesis at the room temperature, and is economical, environment-friendly, low in energy consumption and simple in preparation technology, and the synthesized water reducing agent is high in water-reducing rate, good in fluidity and good in slump retaining performance.

Description

technical field [0001] The invention relates to the technical field of building material admixtures, in particular to a method for preparing a high-efficiency polycarboxylate water reducer at room temperature. Background technique [0002] With the development of the construction industry, the requirements for water reducing agents in engineering applications are gradually increasing. The polycarboxylate water reducer developed in recent years is recognized at home and abroad as the third generation after the first generation of water reducer represented by wood calcium and the second generation of water reducer represented by naphthalene. High performance water reducer. Polycarboxylate superplasticizer has been greatly promoted and applied because of its high water reducing rate and good adaptability. [0003] Chinese patent (CN103275280A) discloses a normal temperature synthesis method of polycarboxylic acid type high slump water reducer, using unsaturated polyether and ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08F283/06C08F220/06C08F2/38C08F4/40C04B24/26C04B103/30
Inventor 刘记伟马丽涛王浩雨
Owner ANHUI XIN SOLID ENVIRONMENTAL CO LTD
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