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Polycarboxylic acid water reducing agent and preparation method thereof

A technology of water reducer and polycarboxylate, which is applied in the field of polycarboxylate water reducer and its preparation, which can solve the problems of damaging the good gradation of sand, polluting the environment, increasing construction costs, etc., and achieves small slump loss and high reaction The process is simple, and the effect of water-reducing dispersibility is good

Inactive Publication Date: 2018-02-16
徐州巨龙新材料科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] In the actual production of ready-mixed concrete, when the mud content in the aggregate exceeds the standard and obviously affects the quality of the concrete, the problem is generally solved by washing the aggregate or increasing the amount of polycarboxylate superplasticizer, but washing It will pollute the environment and damage the good gradation of sand, which is not conducive to the effective control of the water-cement ratio of concrete; simply increasing the amount of polycarboxylate-based water-reducing agent can not solve the problems of water-reducing rate and slump retention, and will increase Construction cost, which affects the use of polycarboxylate superplasticizers in the ready-mixed concrete industry

Method used

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  • Polycarboxylic acid water reducing agent and preparation method thereof
  • Polycarboxylic acid water reducing agent and preparation method thereof

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Experimental program
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Effect test

Embodiment 1

[0017] The following components are pre-selected: macromonomer methallyl polyoxyethylene ether 450g, chain transfer agent mercaptopropionic acid 8g, unsaturated acid acrylic acid 18g, functional monomer methacryloxyethyl phosphate 9g, initiator Ammonium persulfate 0.4g. The preparation process is as follows:

[0018] (1) Macromonomer methallyl polyoxyethylene ether is dissolved in water to obtain aqueous solution A, chain transfer agent mercaptopropionic acid is dissolved in water to prepare aqueous solution B, unsaturated acid acrylic acid and functional monomer are dissolved in water to obtain aqueous solution C ;

[0019] (2) Add aqueous solution A to a four-necked flask equipped with a stirrer, a thermometer, and a dropping device, and add the initiator ammonium persulfate, stir and heat up to a reaction temperature of 45°C, and simultaneously add aqueous solution B dropwise to the four-necked flask and aqueous solution C, the dropping time is 3.5h and 3h respectively, a...

Embodiment 2

[0030] The following components are pre-selected: macromonomer methallyl polyoxyethylene ether 450g, chain transfer agent dodecyl mercaptan 13g, unsaturated acid maleic anhydride 25g, functional monomer multifunctional acid acrylate 12g, Initiator potassium persulfate 1.3g. The preparation process is as follows:

[0031] (1) methallyl polyoxyethylene ether is dissolved in water to obtain aqueous solution A, dodecyl mercaptan is dissolved in water to prepare aqueous solution B, and maleic anhydride and polyfunctional acidic acrylate are dissolved in water to obtain aqueous solution C;

[0032] (2) Add aqueous solution A to a four-necked flask equipped with a stirrer, a thermometer, and a dropping device, and add potassium persulfate, stir and heat up to a reaction temperature of 45°C, and simultaneously add aqueous solution B and aqueous solution to the four-necked flask dropwise C, the dropping time is 3.5h and 3h respectively, and the insulation is kept for 1h after the drop...

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Abstract

The present invention discloses a polycarboxylic acid water reducing agent and a preparation method thereof, wherein the polycarboxylic acid water reducing agent comprises a macromonomer, an unsaturated acid, a functional monomer, an initiator and a chain transfer agent according to a mass ratio of 45:0.8-1.3:1.8-2.5:0.9-1.2:0.04-0.13. According to the present invention, by introducing the functional group, the polycarboxylic acid water reducing agent having characteristics of high mud content and simple reaction process and suitable for aggregate is obtained, such that the concrete can maintain good water reduction and water dispersion ability and low slump loss, and the sufficient strength of the hardened concrete can be ensured; and the aggregate is not required to be rinsed after the prepared polycarboxylic acid water reducing agent is doped, such that the good grading of the sand cannot be damaged, the original performance of the concrete is retained, and the important significance is provided for the wide promotion and application in the pre-mixing concrete industry.

Description

technical field [0001] The invention relates to a polycarboxylate water reducer and a preparation method thereof, belonging to the field of concrete preparation. Background technique [0002] In recent years, with the increasing demand for construction concrete, there are high requirements for admixtures that must be added to concrete, especially in recent years. Development in the direction of environmental protection, high water reduction, high slump retention, and better adaptability to concrete floors. Polycarboxylate superplasticizer is widely used because of its low dosage, high water reducing rate, low concrete shrinkage, and environmental protection. However, a large number of engineering examples and studies have shown that compared with naphthalene-based, aliphatic and sulfamate-based water-reducers, polycarboxylate-based water-reducers are more sensitive to the clay content of aggregates. Because when the mud content is large, the water-reducing and dispersing a...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08F283/06C08F220/06C08F222/06C08F230/02C04B24/26C04B103/30
CPCC08F283/065C04B24/2694C04B2103/302C08F220/06C08F222/06C08F230/02
Inventor 黄文朝
Owner 徐州巨龙新材料科技有限公司