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Mud-resistant polycarboxylic acid water reducing agent and preparation method thereof

A technology of polycarboxylic acid and water reducing agent, which is applied in the field of water reducing agent, can solve the problems of damaging the good gradation of sand, increasing construction costs, polluting the environment, etc., and achieves good water reducing dispersion ability and small slump loss effect

Inactive Publication Date: 2018-10-09
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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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0014] An anti-mud type polycarboxylate water reducer is characterized in that it is composed of the following components in weight percentage: 3% acrylic acid, 0.4% sodium methacrylate sulfonate, 0.3% ammonium persulfate, 0.3% hanging white block, Hexamethylene ethoxylate 36% and water 60%.

[0015] The preparation method of the mud-resistant polycarboxylate superplasticizer, the steps are as follows:

[0016] (1) Fully stir and dissolve hexamethylene polyoxyethylene ether in water at 80°C, stir evenly, and keep the temperature at 30°C;

[0017] (2), open the valve and add the acrylic acid solution, sodium methacrylate sulfonate solution, and ammonium persulfate solution in the high-level tank to the reaction kettle in sequence, and fully stir for 10 minutes;

[0018] (3), turn on the peristaltic pump and start dripping the aqueous solution of the white block within 3 hours, and the dripping is completed within 3 hours, and the heat preservation reaction is 1 hour;

[0019]...

Embodiment 2

[0021] An anti-mud polycarboxylate water reducer is characterized in that it is composed of the following components in weight percentage: 4% acrylic acid, 0.5% sodium methacrylate sulfonate, 0.2% ammonium persulfate, 0.3% white block, Hexamethylene ethoxylate 40% and water 55%.

[0022] The preparation method of the mud-resistant polycarboxylate superplasticizer, the steps are as follows:

[0023] (1) Fully stir and dissolve hexamethylene polyoxyethylene ether in water at 80°C, stir evenly, and keep the temperature at 30°C;

[0024] (2), open the valve and add the acrylic acid solution, sodium methacrylate sulfonate solution, and ammonium persulfate solution in the high-level tank to the reaction kettle in sequence, and fully stir for 10 minutes;

[0025] (3), turn on the peristaltic pump and start dripping the aqueous solution of the white block within 3 hours, and the dripping is completed within 3 hours, and the heat preservation reaction is 1 hour;

[0026] (4), after h...

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PUM

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Abstract

The invention provides a mud-resistant polycarboxylic acid water reducing agent, which is characterized by being prepared from the following ingredients in percentage by weight: 3 to 4 percent of acrylic acid, 0.4 to 0.5 percent of sodium methallyl sulfonate, 0.2 to 0.4 percent of ammonium persulfate, 0.2 to 0.4 percent of sodium formaldehyde sulfoxylate, 30 to 40 percent of hexopentenyl polyoxyethylene ether and 55 to 65 percent of water. The mud-resistant polycarboxylic acid water reducing agent has the following advantages that the concrete can maintain good water reduction dispersion capability; the slump constant loss is small; the hardening concrete is enabled to have the sufficient intensity; in addition, after the mixing, the aggregate flushing is not needed; good graduation of sand cannot be damaged; the original performance of the concrete is remained; important significance is realized on the powerful popularization and application of the mud-resistant polycarboxylic acid water reducing agent to premixed concrete industry.

Description

technical field [0001] The invention relates to the technical field of water reducers, in particular to a mud-resistant polycarboxylate water reducer and a preparation method thereof. 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-red...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08F283/06C08F220/06C08F228/02C04B24/16C04B103/30
CPCC08F283/065C04B24/165C04B2103/302C08F220/06
Inventor 张旋
Owner 徐州巨龙新材料科技有限公司