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Slow-release high-adaptability polyester polycarboxylic acid water-reducing agent and preparation method and application thereof

A technology of polyester polycarboxylate and adaptability, which is applied in the field of mud-resistant polyester polycarboxylate water reducer and its preparation, and can solve the problems of high sensitivity to inorganic salt ions, lack of compatibility, low steric hindrance, etc. problems, to achieve the effects of good time retention, improved tolerance, and good adaptability

Active Publication Date: 2014-12-03
广西红墙新材料有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In order to make the concrete mixture meet the requirements of pumping construction, some units double the amount of admixture, which greatly increases the production cost of concrete and affects the production cost and direct economic benefits of concrete enterprises; some units use more water To solve the problem of insufficient fluidity of the concrete mixture, the actual water-binder ratio of the concrete becomes larger, which seriously affects the strength of the concrete
[0005] Second, ordinary polycarboxylate superplasticizers are highly sensitive to inorganic salt ions
The cement system is a high-salt, high-pH system, and the molecular conformation of the traditional polycarboxylate graft copolymer is affected by the salt concentration, especially the Ca 2+ If the conformation is more curled in the cement system, the adsorption will be slower, and the steric resistance provided will be relatively low, which is not conducive to the dispersion of concrete
[0006] Third, common polycarboxylate superplasticizers have compatibility issues with different cement systems
[0007] How to use a kind of water reducing agent, in the case of high mud content in sand and gravel, it can not only improve the workability of fresh concrete, but also meet the requirements of strength and durability of hardened concrete; when encountering calcium ions There is no sensitivity problem when it comes to the cement system containing fly ash, slag powder, stone powder or clay, and there is no compatibility problem; moreover, it is an economically suitable water reducer and becomes a polymeric water reducer. Breakthroughs in the research of carboxylic acid superplasticizers

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0043] The present invention is an embodiment of a preparation method of a slow-release adaptable polyester polycarboxylate superplasticizer. The method described in this embodiment includes the following steps:

[0044] (1) In a 1000ml four-neck flask equipped with a stirrer, a thermometer and a reflux condenser, add 400ml of deionized water, 0.14mol of 3-mercaptopropionic acid (the mole is 3% of the total monomer mole), 1mol N,N-Dimethacrylamide, 1mol methacrylic acid, 0.5mol polyethylene glycol monomethyl ether methacrylate, 1mol hydroxypropyl acrylate and 1mol glycidyl methacrylate, fully stirred to obtain a mixed solution;

[0045] (2) Raise the temperature of the above mixed solution to 90°C, add the aqueous solution of ammonium persulfate dropwise, and the dropwise addition time is 2.5 hours. Type adaptable polyester polycarboxylate superplasticizer.

Embodiment 2

[0047] The present invention is an embodiment of a preparation method of a slow-release adaptable polyester polycarboxylate superplasticizer. The method described in this embodiment includes the following steps:

[0048] (1) In a 1000ml four-necked flask equipped with a stirrer, a thermometer and a reflux condenser, add 300ml of deionized water, 0.004mol of 3-mercaptopropanol (the mole is 0.5% of the total monomer mole), and 0.2mol CH 2 =CH-CONR 1 R 2 (R 1 for CH 3 , R 2 for C 4 h 9 ), 0.1mol acrylic acid, 0.25mol polyethylene glycol monomethyl ether acrylate, 0.3mol CH 2 =CR-COO(CH 2 )n-OH (R is H, n is 2) and 0.15mol glycidyl acrylate, and the mixture is obtained after thorough stirring;

[0049] (2) Raise the temperature of the above mixed solution to 85°C, add the aqueous solution of potassium persulfate dropwise, and the dropwise addition time is 2 hours. After the dropwise addition, keep the temperature for 2 hours, cool down to 45°C, and adjust the pH to 5 to o...

Embodiment 3

[0051] The present invention is an embodiment of a preparation method of a slow-release adaptable polyester polycarboxylate superplasticizer. The method described in this embodiment includes the following steps:

[0052] (1) In a 1000ml four-neck flask equipped with a stirrer, a thermometer and a reflux condenser, add 500ml of deionized water, 0.89mol of mercaptoacetic acid (the moles are 5% of the total monomer moles), 3mol CH 2 =CH-CONR 1 R 2 (R 1 for C 2 h 5 , R 2 for C 3 h 7 ), 5mol sodium allyl sulfonate, 3mol polyethylene glycol monomethyl ether methacrylate, 2mol CH 2 =CR-COO(CH 2 )n-OH (R is CH 3 , n is 5) and 4mol of glycidyl methacrylate, after fully stirring, a mixed solution is obtained;

[0053] (2) Raise the temperature of the above mixed solution to 95°C, add the aqueous solution of benzoyl peroxide dropwise, and the dropwise addition time is 3 hours. Polyester polycarboxylate superplasticizer with strong release adaptability.

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PUM

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Abstract

The invention discloses a method for preparing a slow-release high-adaptability polyester polycarboxylic acid water-reducing agent. According to the method, a slow-release positive-negative non-ionic mud-resistant polyester polycarboxylic acid water-reducing agent product is synthesized by utilizing a high-molecular structural design principle. The invention also discloses the slow-release high-adaptability polyester polycarboxylic acid water-reducing agent prepared through the method and an application of the slow-release high-adaptability polyester polycarboxylic acid water-reducing agent in concrete. Compared with the prior art, the slow-release high-adaptability polyester polycarboxylic acid water-reducing agent disclosed by the invention has the advantages that the molecular structure of the product contains an ester group and an amide group which are unstable in a cement strong-alkali environment, positive amine ions generated by hydrolyzing the amide group achieve a sealing effect on mud carried with negative charges so that the mud-resistant effect is achieved, the thickening effect is achieved on cement mortar, and the hydration of cement particles is postponed. The slow-release high-adaptability polyester polycarboxylic acid water-reducing agent disclosed by the invention has the advantages of high water-reducing rate, good slump ageing stability, high tolerance on the mud and good adaptability on coal ash, fine ore, stone powder, clays and the like.

Description

technical field [0001] The invention relates to the field of concrete admixtures, in particular to a mud-resistant polyester polycarboxylate water reducer which slowly releases anion and cation non-ions, a preparation method thereof and an application in concrete. Background technique [0002] Water reducer (superplasticizer) is a chemical admixture and one of the essential components of modern concrete. The emergence of polyester polycarboxylate superplasticizer has expanded the scope of application of concrete. Polyester polycarboxylate superplasticizer is a comb-shaped polymer composed of anion (polycarboxylate) and side chain (polyethylene glycol). It is usually called polycarboxylate high-efficiency / high-performance superplasticizer. Adding polycarboxylate superplasticizer to concrete can reduce or completely avoid the aggregation of cement particles, so that the mixing water wrapped in cement flocculation particles is released to lubricate the particles, thereby reduc...

Claims

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Application Information

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IPC IPC(8): C08F290/06C08F220/54C08F220/06C08F220/28C08F220/32C08F228/02C04B24/26C04B24/16C04B103/30
Inventor 张小富赵利华白淑英张海玲
Owner 广西红墙新材料有限公司
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