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Slow-release collapse-preventing type polycarboxylic water reducing agent and preparation method thereof

A technology of polycarboxylate and water reducer, which is applied in the field of polycarboxylate water reducer, can solve the problems of large slump loss of fresh concrete, achieve high double bond retention rate, good adaptability, and improve dispersion The effect of stability and dispersion retention

Inactive Publication Date: 2014-04-23
MAANSHAN CHINASEA NEW MATERIAL
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The present invention aims at the technical problem that the slump loss of fresh concrete is large, and most current water reducers cannot solve the technical problem. Reduce the slump loss of freshly mixed concrete, enhance the adaptability of polycarboxylate superplasticizer and various cements, and prolong the beneficial effect of its action time with concrete

Method used

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Examples

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Effect test

preparation example Construction

[0027] A preparation method of slow-release polycarboxylate water reducer, characterized in that it comprises the following steps:

[0028] (1) Prepare the required raw materials, among which: macromonomer methallyl polyoxyethylene ether (molecular weight 1200-2950) accounts for 30%-65% of the total monomer mass, acrylic acid accounts for 10%- 20%, polyethylene glycol monomethacrylate accounts for 5% to 15% of the total mass of the monomer, imide accounts for 10% to 15% of the total mass of the monomer, and the initiator accounts for 0.01% to the total mass of the monomer 0.1%, V.C accounts for 0.1%-0.5% of the total mass of the monomer; the amount of chain transfer agent accounts for 0.01%-0.2% of the total mass of the monomer, and deionized water accounts for 38%-45% of the total mass of the solution; The sum of the mass of propyl polyoxyethylene ether, acrylic acid, polyethylene glycol monomethacrylate, and imide is the total mass of monomers;

[0029] (2) According to the...

Embodiment 1

[0037] A preparation method of a slow-release slump-preserving polycarboxylate water reducer, comprising the following steps:

[0038] (1) In a four-necked flask equipped with a stirrer and a thermometer, add 125.5 g of methallyl polyoxyethylene ether (molecular weight: 1200) and 117.6 g of deionized water, and heat up to 40°C to dissolve while stirring; When it was stabilized at 40°C, 2.42g of hydrogen peroxide with a concentration of 35% by mass was added.

[0039] (2) Weigh respectively 58.8g of acrylic acid, 42.2g of polyethylene glycol monomethacrylate, and 56.5g of imide, and dissolve them in 68g of deionized water to prepare aqueous solution A.

[0040] (3) Weigh 0.18g of mercaptopropionic acid, 0.4g of V.C, dissolve in 27.4g of deionized water to make aqueous solution B.

[0041] (4) When the temperature of the solution in the flask in step (1) rises to 50°C, start to drop the aqueous solution A and aqueous solution B prepared in steps (2) and (3) into the flask, and ...

Embodiment 2

[0047] A preparation method of a slow-release slump-preserving polycarboxylate water reducer, comprising the following steps:

[0048] (1) In a four-necked flask equipped with a stirrer and a thermometer, add 182.5g of methallyl polyoxyethylene ether (molecular weight: 2400) and 99.9g of deionized water, and heat up to 40°C to dissolve while stirring; When stabilized at 40°C, add 1.66g of 35% hydrogen peroxide.

[0049] (2) Weigh 60.8g of acrylic acid, 23.5g of polyethylene glycol monomethacrylate, and 36.2g of a self-made imide, and dissolve them in 80.3g of deionized water to prepare aqueous solution A.

[0050] (3) Weigh 0.08g of mercaptopropionic acid, 0.36g of V.C, dissolve in 16.8g of deionized water to make aqueous solution B.

[0051] (4) When the temperature of the solution in the flask in step (1) rises to 60°C, start to drop the aqueous solution A and aqueous solution B prepared in steps (2) and (3) into the flask, and the dropping time is about 1.5 and 2 hours. ...

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Abstract

The invention discloses slow-release collapse-preventing type polycarboxylic water reducing agent and a preparation method thereof, and belongs to the field of preparation of the water reducing agent. The slow-release collapse-preventing type polycarboxylic water reducing agent consists of methyl allyl polyoxyethylene ether, acrylic acid, methyl acrylic polyethylene glycol monoester, imide, initiator, vitamin C, chain transfer agent and deionized water. The preparation method comprises the following steps of: preparing macromonomer methyl allyl polyoxyethylene ether, acrylic acid, methyl acrylic polyethylene glycol monoester, imide and vitamin C; under the action of the polymerization initiator and the chain transfer agent, dissolving the methyl allyl polyoxyethylene ether into deionized water, rising temperature to 40 DEG C for dissolving, adding the initiator, then respectively dripping water solution A prepared by dissolving the chain transfer agent, the acrylic acid, the methyl acrylic polyethylene glycol monoester and the imide in the deionized water and V.C water solution B, and after the dripping is finished, carrying out insulation, cooling and neutralization to obtain a finished product. The slow-release collapse-preventing type polycarboxylic water reducing agent disclosed by the invention has the advantages that the loss and the evaporation of water in concrete due to long-time transportation and higher temperature are effectively prevented, and the difficulty of excessively-fast slump loss of the concrete in engineering is solved.

Description

technical field [0001] The invention relates to a polycarboxylate water-reducer, more precisely, to a slow-release slump-preserving polycarboxylate water-reducer and a preparation method thereof. Background technique [0002] With the acceleration of the country's urbanization process and the development of large-scale infrastructure, the use of concrete and cement as important materials for artificial structures is increasing. In order to realize the construction of an economical society and to meet the construction and strength needs of some large-scale and super-large projects, higher requirements are put forward for ready-made concrete. In order to maintain the good working performance of concrete and meet the needs of various projects, it is necessary to add water reducers with different functions to fresh concrete. Among various series of water reducers, polycarboxylate water reducers are the third generation of high-performance water reducers developed after the firs...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08F290/06C08F283/06C08F220/06C04B24/26C04B103/30
Inventor 金文娟刘晓玲何宝国佘祥海
Owner MAANSHAN CHINASEA NEW MATERIAL
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