Early-strength polycarboxylate water reducing agent for component and preparation method for early-strength polycarboxylate water reducing agent

A technology of polycarboxylate and water-reducing agent, which is applied in the field of preparation of concrete water-reducing agent, which can solve the problems of water-reducing agent, such as early strength reduction, good dispersibility, and low air-entrained volume, and achieve cement hydration speed enhancement, Good dispersibility and low air-entraining effect

Active Publication Date: 2014-08-06
广西宝添环保材料有限公司
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  • Abstract
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  • Claims
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Problems solved by technology

[0005] The technical problem to be solved by the present invention is to provide an early-strength polycarboxylate water-reducer for components and its preparation method. The concrete components required by the early strength of the day are environmentally friendly and harmless to the human body, thereby solving the problems of the existing polycarboxylate-based water reducers with poor early strength and poor reducing properties

Method used

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  • Early-strength polycarboxylate water reducing agent for component and preparation method for early-strength polycarboxylate water reducing agent
  • Early-strength polycarboxylate water reducing agent for component and preparation method for early-strength polycarboxylate water reducing agent
  • Early-strength polycarboxylate water reducing agent for component and preparation method for early-strength polycarboxylate water reducing agent

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preparation example Construction

[0030] The embodiment of the present invention also provides a method for preparing an early-strength polycarboxylate water reducer for components, including:

[0031] Get each component by the formula of the embodiment of the invention;

[0032] Under the temperature condition of 20-40℃, each component is polymerized in an aqueous solution by using a redox initiation system. After the polymerization reaction, the polymer obtained after being neutralized by a neutralizing agent is the early-strength type for building blocks. Polycarboxylate water reducer.

[0033] In the above preparation method, the oxidizing agent in the redox initiation system used is one of hydroperoxide, persulfate or their mixture, and the amount of said oxidizing agent is 0.2% to 0.2% of the total monomer weight in each component. 2.0%;

[0034] The reducing agent in the redox initiation system used is one of the low-valent compounds of sulfur, L-ascorbic acid or their mixture, and the amount of the r...

Embodiment 1

[0068] This example provides an early-strength polycarboxylate water-reducer for components. The preparation method is as follows: the addition amount of each component used in the water-reducer is by weight. Add 450 parts by weight of methylbutenyl polyethylene glycol propylene glycol ether (m=55, n=1) with a weight average molecular weight of 2500, 400 parts by weight of the four-necked glass flask of the device, reflux condenser and nitrogen protection device Ionized water and 4.0 parts by weight of hydrogen peroxide with a mass concentration of 27% were stirred and the temperature was controlled at 25±3°C, and 37.5 parts by weight of acrylic acid, 7.5 parts by weight of acrylic acid and 7.5 parts by weight of Parts of acrylamide, 2.5 parts by weight of sodium methacryl sulfonate and 100 parts by weight of deionized water monomer solution, dropwise mixed with 2.5 parts by weight of mercaptopropionic acid and 60 parts by weight of the mass concentration of 2% The reaction ac...

Embodiment 2

[0070] This example provides an early-strength polycarboxylate water-reducer for components. The preparation method is as follows: the addition amount of each component used in the water-reducer is by weight, and it is equipped with a stirrer, a thermometer, and a dropping device. 450 parts by weight of methylbutenyl polyethylene glycol dipropylene glycol ether (m=87, n=2) with a weight average molecular weight of 4000, 400 parts by weight of Ionized water and 4.0 parts by weight of hydrogen peroxide with a mass concentration of 27% were stirred and the temperature was controlled at 25±3°C, and 40.0 parts by weight of acrylic acid, 7.5 parts by weight of The monomer solution of 2-methacrylamide-3-propenesulfonic acid and 100 parts by weight of deionized water was added dropwise and mixed with 2.5 parts by weight of mercaptopropionic acid and 60 parts by weight of L- The reaction accelerator solution of ascorbic acid, after the dropwise addition, the reaction ends, the temperat...

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Abstract

The invention discloses an early-strength polycarboxylate water reducing agent for a component and a preparation method for the early-strength polycarboxylate water reducing agent, and belongs to the field of water reducing agent preparation. The water reducing agent is formed by polymerization of the following ingredients in percentage by weight: 80-85% of methyl alkene butyl polyoxyethylene polypropylene oxide monomer with the molecular weight more than 2400, 10-15% of unsaturated monocarboxylic acid and derivative monomer thereof and 0.5-5% of unsaturated alkenyl sulfoacid and sodium salt thereof; the preparation method comprises the following steps: under the temperature condition of 20-40 DEG C, all ingredients are enabled to be subjected to polymerization reaction in an aqueous solution by adopting a redox initiation system, after polymerization reaction is performed, neutralization is performed through a neutralizing agent, so that the polymer with low air entraining amount and good dispersibility is obtained; the early-strength performance of the polycarboxylate water reducing agent is reinforced with the increasing of the macromonomer molecular weight; the using requirements of early strength or super early strength of the component are met.

Description

technical field [0001] The invention relates to the field of preparation of concrete water reducers, in particular to an early-strength polycarboxylate water reducer for prefabricated components and a preparation method thereof. Background technique [0002] Precast concrete technology has the advantages of good product quality, fast construction, and clean site, and is suitable for elevated long-span prestressed U-shaped bridges and prestressed high-strength concrete pipe piles. With the development of the construction industry, resource conservation and environmental friendliness are constantly advocated in the 21st century. C40-C100 precast concrete is often mixed with a large amount of mineral admixtures, and it is more and more widely used and developed faster in the field of municipal and construction engineering. . Generally, early-strength concrete uses traditional admixture products such as naphthalene-based water-reducers, aliphatic water-reducers, sulfamic acid-b...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08F290/06C08F220/06C08F220/56C08F228/02C04B24/16C04B103/30
Inventor 李崇智向艳飞马健王琴戚承志周文娟隗功骁张赫
Owner 广西宝添环保材料有限公司
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