Block poly-carboxylic acid concrete high-efficiency water reducing agent and preparation method thereof

A high-efficiency water reducer and polycarboxylic acid technology, applied in the field of concrete admixtures, can solve the problems that it is difficult to meet the new and higher requirements of concrete, and the development space is not large, so as to achieve narrow molecular weight distribution, improve fluidity, and molecular weight controllable effect

Active Publication Date: 2014-01-01
JIANGSU SOBUTE NEW MATERIALS +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

With the in-depth excavation of the structure-activity relationship of polycarboxylate superplasticizers with random structures and the limit optimization of the performance of comb copolymer admixtures, researchers have found that the further performance improvement and functionalization of comb copolymers have entered a bottleneck state. Comb polymer dispersants have been difficult to meet the new and higher requirements of concrete, and there is little room for development

Method used

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  • Block poly-carboxylic acid concrete high-efficiency water reducing agent and preparation method thereof
  • Block poly-carboxylic acid concrete high-efficiency water reducing agent and preparation method thereof
  • Block poly-carboxylic acid concrete high-efficiency water reducing agent and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0054] Step 1): Add 10g polyethylene glycol monomethyl ether acrylate monomer (Mw=400), 25g DMF, 111.68mg to a four-necked flask equipped with a thermometer, stirrer, reflux condenser and rubber stopper CuBr 2 , 156.2mg bipyridyl and 88mg ascorbic acid, pass into N 2 Oxygen in the reaction vessel and the reaction medium was removed, and the temperature was raised to 90° C. with stirring. After 30 minutes, 97.53 mg of initiator 2-bromoisobutyrate ethyl was added to initiate the polymerization reaction for 12 hours.

[0055] 2) After separating the homopolymer and small molecules with tetrahydrofuran, add 9g of sodium methacrylate and 35g of water into the highly viscous reaction mixture. After reacting for 18 hours, cool naturally below 40°C to obtain a copolymer solution.

[0056] The pH value of the copolymer solution is about 7-8, the solid content is 34.12%, the weight average molecular weight of the copolymer is 20355g / mol, and the PDI=1.39.

Embodiment 2

[0058] Step 1): According to the procedure described in Example 1, 27.5g of polypropylene glycol mono(meth)acrylate monomer (Mw=1100), 55.42g of methanol, 89.66mg of CuBr, and 216.63mg of pentamethyl were sequentially added to the reaction vessel Diethylenetriamine, through N 2 The oxygen in the reaction vessel and the reaction medium was removed, and the temperature was raised to 55° C. with stirring. After 30 minutes, 104.38 mg of the initiator methyl 2-bromopropionate was added to initiate the polymerization reaction for 7 hours.

[0059] Step 2): After separating the homopolymer and small molecules with tetrahydrofuran, add 13.5g of sodium methacrylate and 87g of water into the highly viscous reaction mixture, react for 18 hours, and naturally cool to below 40°C to obtain the copolymer substance solution.

[0060] The pH value of the copolymer solution is about 7~8 (solid content 31.85%), the weight average molecular weight of the copolymer is 39672g / mol, and PDI=1.31.

Embodiment 3

[0062] Step 1) According to the procedure described in Example 1, 23.75g of polyethylene glycol monomethyl ether acrylate monomer (Mw=950), 55.42g of anisole, 35.35mg of CuCl, 164.56mg of three (2-Dimethylaminoethyl)amine, through N 2 The oxygen in the reaction vessel and the reaction medium was removed, and the temperature was raised to 90°C with stirring. After 30 minutes, 63.86 mg of the initiator 2-bromoisopropionyl bromide was added to initiate the polymerization reaction for 16 hours.

[0063] Step 2) After separating the homopolymer and small molecules with tetrahydrofuran, 11.75g ​​of sodium acrylic acid and 107g of water were added to the highly viscous reaction mixture. After reacting for 18 hours, it was naturally cooled to below 40°C to obtain a copolymer solution.

[0064] The pH value of the copolymer solution is about 7~8 (solid content 24.37%), the weight average molecular weight of the copolymer is 80541g / mol, and PDI=1.23.

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Abstract

The invention provides a block poly-carboxylic acid concrete high-efficiency water reducing agent with an ordered structure and a preparation method thereof. The block poly-carboxylic acid is prepared by using atom transfer radical polymerization, the structural regularity and the molecular weight distribution of the poly-carboxylic acid are controlled effectively, and the water reducing agent is used in a cement dispersing process. By adoption of the block poly-carboxylic acid concrete high-efficiency water reducing agent and the preparation method thereof, the problems of uncontrollable molecular weight of the poly-carboxylic acid, wider molecular weight distribution, un-designable molecular structure and the like are solved.

Description

technical field [0001] The invention relates to the technical field of concrete admixtures in building materials, in particular to a block polycarboxylic acid that can be used as a high-efficiency water reducer for concrete and a preparation method thereof. Background technique [0002] Concrete is the most common building material. With the continuous development of science and technology, people's requirements for the function and quality of building structures have gradually increased. Therefore, concrete admixtures have emerged as the times require. Concrete admixture is a material added before or during concrete mixing to improve the performance of freshly mixed (or) hardened concrete. With the progress of society and the development of science and technology, there are more and more types of concrete admixtures, which are divided into four categories according to their main functions: (1) Admixtures to improve the rheological properties of concrete mixtures, including ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B24/26C04B103/30
Inventor 冉千平王秀梅杨勇周栋梁刘金芝
Owner JIANGSU SOBUTE NEW MATERIALS
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