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High slump retaining type polycarboxylic acid water reducing agent with sustained-release effect and preparation method thereof

A technology of polycarboxylic acid and water reducing agent, applied in the field of concrete admixtures, can solve the problems of poor slump retention performance and large slump loss, and achieve the effects of excellent product performance, no slump loss, and wide applicability.

Active Publication Date: 2012-06-20
CHINA STATE CONSTR READY MIXED CONCRETE CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] The technical problem to be solved by the present invention is to provide a high-slump polycarboxylate water-reducer with slow-release effect and its preparation method, so as to overcome the excessive slump loss of fresh concrete in traditional polycarboxylate water-reducers, Disadvantages of poor slump performance

Method used

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  • High slump retaining type polycarboxylic acid water reducing agent with sustained-release effect and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] In a 500ml four-necked flask equipped with a thermometer, agitator and dropping funnel, add 100g of deionized water and 120g of prenol polyoxyethylene ether (polymerization degree n=54) in sequence, turn on nitrogen, heat in a water bath, and control the temperature When the temperature is about 40°C, stir while heating. After the isopentenol polyoxyethylene ether is melted, when the temperature is slowly raised to 60°C, add 2.84g of acrylamide, dropwise add 132g of an aqueous solution containing 5g of ammonium persulfate and 132g of an aqueous solution containing 78 g of a mixed aqueous solution of 28.6 g of hydroxyethyl methacrylate, 17.2 g of methacrylic acid, 0.3 g of mercaptoacetic acid, and 0.017 g of hydroquinone. The dropwise addition time of the mixed aqueous solution of hydroxyethyl methacrylate, methacrylic acid, thioglycolic acid and hydroquinone is 3.5 hours, and the dropwise addition time of the ammonium persulfate aqueous solution is 4 hours. Finally, coo...

Embodiment 2

[0024]In a 500ml four-necked flask equipped with a thermometer, a stirrer and a dropping funnel, add 100g of deionized water and 130g of allyl polyglycol ether (polymerization degree n=23) in sequence, turn on nitrogen, heat in a water bath, and control the temperature When the temperature is about 40°C, stir while heating. After the allyl polyglycol ether macromonomer melts, slowly raise the temperature to 60°C, add 3.62g of 2-acrylamido-2-methylpropanesulfonic acid Sodium was added dropwise to 135 g of an aqueous solution containing 5 g of ammonium persulfate and 86.5 g of a mixed aqueous solution containing 27.2 g of hydroxypropyl acrylate, 18.6 g of acrylic acid, 0.3 g of thioglycolic acid, and 0.022 g of phenothiazine. The dropwise addition time of the mixed aqueous solution of hydroxypropyl enoate, acrylic acid, thioglycolic acid and phenothiazine is 3.5 hours, the dropwise addition time of the ammonium persulfate aqueous solution is 4 hours, and the temperature is kept a...

Embodiment 3

[0026] In a 500ml four-necked flask equipped with a thermometer, a stirrer and a dropping funnel, add 100g of deionized water and 126g of prenol polyoxyethylene ether (polymerization degree n=54) in sequence, turn on nitrogen, heat in a water bath, and control the temperature 40°C, stir while heating, after the isopentenol polyoxyethylene ether macromonomer melts, slowly raise the temperature to 60°C, add 3.27g of acrylamide, dropwise add 4.6g of potassium persulfate 144 g of aqueous solution and 87.5 g of mixed aqueous solution containing 28.3 g of hydroxyethyl acrylate, 17.8 g of methacrylic acid, 0.35 g of sodium methacryl sulfonate, and 0.024 g of hydroquinone. The dripping time of the mixed aqueous solution of hydroxyethyl acrylate, methacrylic acid, sodium methacryl sulfonate and hydroquinone is 3.5 hours, the dropping time of potassium persulfate aqueous solution is 4 hours, and keep warm at 60°C after the dropping 3h. Finally, cool down, add alkali to neutralize, and ...

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Abstract

The invention relates to a high slump retaining type polycarboxylic acid water reducing agent with a sustained-release effect and a preparation method thereof. The preparation method is characterized by comprising the following steps of: preserving 5-30 mol% of monomer A, 30-60 mol% of monomer B, 20-55 mol% of monomer C at 60-80 DEG C for 1-3 h under the effect of an initiator, a chain transfer agent and a polymerization inhibitor; copolymerizing the monomers to obtain a polymer with molecular weight of 30000-100000; and then adding alkali to neutralize the polymer, wherein the total amount of the monomers A, B and C is 100 mol%; the monomer C comprises a slump retaining auxiliary 1 and a slump retaining auxiliary 2 according to a mol ratio of 1:20-13:20; the monomer A is isopentene alcohol polyoxyethylene ether, allyl polyethylene glycol, 1-methyl-2-allyl polyethylene glycol or allyl poly diglycidyl ether with polymerization degree n of 20-60; and the monomer B is acrylic acid or methacrylic acid. The high slump retaining type polycarboxylic acid water reducing agent with the sustained-release effect, provided by the invention, has the advantages of excellent slump retaining property, substantially no loss for slump degree within 3 h and wide applicability.

Description

technical field [0001] The invention belongs to the field of concrete admixtures, in particular to a high-slump-retaining polycarboxylate water reducer with slow-release effect and a preparation method thereof. Background technique [0002] With the development of large-scale infrastructure in the country, the emergence of a large number of high-tech, sophisticated and cutting-edge projects has enabled the commercial concrete industry to develop by leaps and bounds. In particular, the emergence of a number of large-scale and super-large projects has put forward higher requirements for ready-made concrete. In order to maintain the good working performance of concrete and meet different engineering needs, it is necessary to add water reducing agents with different functions to fresh concrete. Among various series of water reducers, polycarboxylate high-performance water reducers are the most promising high-performance water reducers. The molecular structure characteristics o...

Claims

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Application Information

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IPC IPC(8): C04B24/26C08F290/06C08F220/28C08F220/06C08F220/56C08F220/58C08F228/02C08F2/38C04B103/30
Inventor 刘行宇周辉郑广军熊骁辉韩周冰黄波刘勇彰陈景邰炜纪晓辉顾芳袁明华王凤玲韩武军朱长余何赛
Owner CHINA STATE CONSTR READY MIXED CONCRETE CO LTD
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