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Polycarboxylate superplasticizer and preparation process thereof

A technology for preparation process and water reducer, which is applied in the field of polycarboxylate water reducer and preparation process, can solve problems affecting construction and engineering quality, strong temperature sensitivity, insufficient slump retention, etc., and achieve high water reducing rate, Low dosage, good slump retention effect

Inactive Publication Date: 2018-11-02
山西中铁铁诚建材科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] However, at present, polycarboxylate superplasticizers have problems such as insufficient slump retention, strong temperature sensitivity, and high viscosity in high-temperature environments, which seriously affect construction and engineering quality.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] A kind of preparation technology of polycarboxylate water reducing agent, comprises the steps:

[0020] S1. Raw materials, acrylic acid, sodium methacrylate sulfonate, mercaptoacetic acid, ascorbic acid, ammonium persulfate, sodium hydroxide, dichotamine, hexamethylene polyoxyethylene ether;

[0021] S2. Use deionized water to prepare the following raw materials to the corresponding concentrations: 40% acrylic acid, 11% sodium methacrylate, 6% ammonium persulfate, 3.8% dicetite, and 108% hexamethylene polyoxyethylene ether (dissolved at a temperature of 80°C), thioglycolic acid 26%, ascorbic acid 30%, sodium hydroxide 20%;

[0022] S3. Stir the pentenyl polyoxyethylene ether solution evenly and keep the temperature at about 30°C, open the valve and add the acrylic acid solution, sodium methacrylate sulfonate solution, ammonium persulfate solution, and ascorbic acid solution in the high-level tank to the reaction in sequence After fully stirring for 30 minutes, turn on ...

Embodiment 2

[0028] A kind of preparation technology of polycarboxylate water reducing agent, comprises the steps:

[0029] S1. Raw materials, acrylic acid, sodium methacrylate sulfonate, mercaptoacetic acid, ascorbic acid, ammonium persulfate, sodium hydroxide, dichotamine, hexamethylene polyoxyethylene ether;

[0030] S2. Use deionized water to prepare the following raw materials to the corresponding concentrations: 38% acrylic acid, 10.5% sodium methacrylate, 6% ammonium persulfate, 4% dicetite, and 110% hexamethylene polyoxyethylene ether (dissolved at a temperature of 80°C), thioglycolic acid 21%, ascorbic acid 25%, sodium hydroxide 30%;

[0031] S3. Stir the pentenyl polyoxyethylene ether solution evenly and keep the temperature at about 30°C, open the valve and add the acrylic acid solution, sodium methacrylate sulfonate solution, ammonium persulfate solution, and ascorbic acid solution in the high-level tank to the reaction in sequence After fully stirring for 25 minutes, turn on ...

Embodiment 3

[0037] A kind of preparation technology of polycarboxylate water reducing agent, comprises the steps:

[0038] S1. Raw materials, acrylic acid, sodium methacrylate sulfonate, mercaptoacetic acid, ascorbic acid, ammonium persulfate, sodium hydroxide, dichotamine, hexamethylene polyoxyethylene ether;

[0039] S2. Use deionized water to prepare the following raw materials to the corresponding concentrations: 38% acrylic acid, 11% sodium methacrylate, 6.5% ammonium persulfate, 3.5% dicetite, and 110% hexamethylene polyoxyethylene ether (dissolved at a temperature of 80°C), thioglycolic acid 30%, ascorbic acid 26%, sodium hydroxide 25%;

[0040] S3. Stir the pentenyl polyoxyethylene ether solution evenly and keep the temperature at about 30°C, open the valve and add the acrylic acid solution, sodium methacrylate sulfonate solution, ammonium persulfate solution, and ascorbic acid solution in the high-level tank to the reaction in sequence After fully stirring for 30 minutes, turn o...

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PUM

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Abstract

The invention discloses a preparation process of a polycarboxylate superplasticizer. The preparation process includes steps: S1, taking acrylic acid as a raw material; S2, adopting deionized water formaking the raw material in a corresponding concentration; S3, well stirring isoprenyl polyoxyethylene ether solution, keeping the temperature at about 30 DEG C, opening a valve to sequentially addingacrylic acid solution, sodium methallyl sulfonate solution, ammonium persulfate solution and ascorbic acid solution into a reaction kettle from a high level tank, well stirring for 20-30min, startinga peristaltic pump, dropwise adding mercaptoacetic acid solution and sodium formaldehyde sulfoxylate solution within 3h, and performing thermal reaction for 3-4h; S4, after thermal reaction is finished, adding sodium hydroxide solution to adjust a PH value to 7-8, and cooling to 40 DEG C to obtain the polycarboxylate superplasticizer. The invention further discloses the polycarboxylate superplasticizer prepared according to the preparation process. Compared with a polycarboxylate superplasticizer in the prior art, the polycarboxylate superplasticizer prepared according to the preparation process has advantages of high slump loss resistance, low temperature sensitivity, high compatibility to various types of cements, low admixture amount, high water reducing rate and low shrinkage.

Description

technical field [0001] The invention relates to a polycarboxylate water reducer, in particular to a polycarboxylate water reducer and a preparation process. Background technique [0002] Polycarboxylate Superplasticizer (Polycarboxylate Superplasticizer) is a high-performance water-reducing agent and a cement dispersant in the application of cement concrete. Widely used in highways, bridges, dams, tunnels, high-rise buildings and other projects. [0003] In many concrete projects, traditional high-efficiency concrete such as naphthalene series is increasingly unable to meet engineering needs due to limitations in technical performance. A new generation of water reducer that has attracted much attention at home and abroad, polycarboxylate high-performance water reducer, because it has truly designed an effective molecular structure based on the mechanism of dispersed cement, has a super-dispersion type, and can prevent concrete slump loss. It does not cause obvious retardat...

Claims

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Application Information

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IPC IPC(8): C04B24/16C08F283/06C08F220/06C08F228/02C08F2/44C04B103/30
CPCC04B24/165C04B2103/302C08F2/44C08F283/065C08F220/06C08F228/02
Inventor 贾亨科
Owner 山西中铁铁诚建材科技有限公司
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