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High-solid-content early-strength viscosity-reducing polycarboxylate superplasticizer and preparation method thereof

A technology with high solid content and polycarboxylic acid, applied in solid waste management, sustainable waste treatment, climate sustainability, etc., can solve problems such as low production efficiency and storage efficiency, high production and transportation costs, and complex control processes , to achieve the effects of improved production efficiency and storage efficiency, good slump loss, and low dosage

Pending Publication Date: 2022-06-07
HUAXIN CEMENT
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] At present, the synthesis technology of polycarboxylate superplasticizer is relatively mature and stable, but there are still shortcomings such as long reaction time, complicated control process, and low solid content, which lead to high production and transportation costs, low production efficiency and storage efficiency, etc.

Method used

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  • High-solid-content early-strength viscosity-reducing polycarboxylate superplasticizer and preparation method thereof
  • High-solid-content early-strength viscosity-reducing polycarboxylate superplasticizer and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0042] Add 340mL of water, 325g of HPEG2400 polyoxyethylene ether monomer, 10g of fumaric acid, and 13g of sodium methacrylate sulfonate in sequence to a 1000mL four-necked flask equipped with a stirrer and a thermometer, and the temperature is controlled at 35°C; Add 8g of hydrogen peroxide solution, after 10min, slowly pump and drop the aqueous solution B (mass fraction 20%) containing 12g of mercaptoethanol and 0.5g of vitamin C into the above-mentioned four-necked flask; stir evenly for 5min, and add the solution containing 35g of acrylic acid and 10g of acetic acid. Aqueous solution A (mass fraction 30%) was slowly pumped dropwise into the above-mentioned four-necked flask. Solution A was added dropwise for 3 hours, solution B was added dropwise for 3.5 hours, and the reaction temperature was controlled at 45°C. After the dropwise addition, heat preservation and aging for 1 hour, add 100 g of triethanolamine to the four-necked flask at one time, stir evenly, and cool to r...

Embodiment 2

[0044] Add 330mL of water, 315g of TPEG2400 polyoxyethylene ether monomer, 10g of fumaric acid, 5g of sodium hypophosphite, and 20g of sodium propylene sulfonate in sequence to a 1000mL four-necked flask equipped with a stirrer and a thermometer, and the temperature is controlled at 35°C; stir well; Then, 6g of ammonium persulfate was added at one time, and after 10min, the aqueous solution B (mass fraction 20%) containing 12g of mercaptopropionic acid and 0.3g of vitamin C was slowly pumped and dropped into the above-mentioned four-necked flask; The aqueous solution A (mass fraction 30%) of 30 g of methacrylic acid and 15 g of acrylic acid was slowly pumped and added dropwise to the above-mentioned four-necked flask. Solution A was added dropwise for 3 hours, solution B was added dropwise for 3.5 hours, and the reaction temperature was controlled at 45°C. After the dropwise addition was completed, the temperature was kept for 0.5h, and 100g of diethanol monoisopropanolamine w...

Embodiment 3

[0046] Add 320 mL of water, 320 g of EPEG3000 polyoxyethylene ether monomer, 5 g of fumaric acid, 10 g of sodium hypophosphite, and 15 g of sodium propylene sulfonate in sequence to a 1000 mL four-necked flask equipped with a stirrer and a thermometer, and the temperature is controlled at 40°C; stir evenly; Then, 5 g of hydrogen peroxide solution was added at one time, and after 10 minutes, the aqueous solution B (mass fraction 20%) containing 14 g of mercaptoethanol and 0.4 g of vitamin C was added to the above-mentioned four-necked flask at one time; 25g of maleic acid aqueous solution A (mass fraction 30%) was added to the above-mentioned four-necked flask at one time; the reaction temperature was controlled at 45°C and kept for aging for 0.5h, and 100g of hydroxyethyl diisopropanol was added to the four-necked flask at one time The amine is stirred evenly and cooled to room temperature to obtain a high-solid content early-strength viscosity-reducing polycarboxylate water-re...

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Abstract

The invention relates to a high-solid-content early-strength viscosity-reducing polycarboxylic acid water reducer and a preparation method thereof. The water reducer comprises the following components: 32-36 parts of unsaturated polyoxyethylene ether monomer, 1-2 parts of initiator, 1-2 parts of unsaturated hydrocarbon functional monomer, 0.3-0.8 part of oxidant, solution A, solution B, 7-12 parts of early-strength neutralizer and the balance of water, the solution A comprises 4-5 parts of unsaturated acid and 7-10 parts of water, and the solution B comprises the following raw materials in parts by mass: 0.5-2 parts of a chain transfer agent, 0.02-0.04 part of a reducing agent and 3-5 parts of water. The solid content of the prepared solid-content water reducer is 10-15% higher than that of a traditional solid-content polycarboxylic acid water reducer, when high-performance concrete is produced under the condition that the water-binder ratio is extremely low, the viscosity of a mixture of the solid-content water reducer is greatly reduced, the workability is improved, the problem that the high-performance concrete is thick and difficult to construct is solved, and the early strength of the concrete can be improved.

Description

technical field [0001] The invention relates to a building material concrete admixture, more particularly, to a high-solid content, early-strength, viscosity-reducing type polycarboxylate water-reducing agent and a preparation method thereof. Background technique [0002] With the high-rise, light-weight, large-scale and complex structure of modern buildings and engineering facilities, high-strength or even ultra-high-strength concrete has been widely used due to its high overall strength and light weight. However, its characteristics of high glue material and low water-binder ratio lead to high viscosity and slow flow rate of fresh concrete mixture, which seriously affects its construction efficiency and greatly limits the promotion and application of high performance concrete. [0003] Patent CN102181062B reported that the poly(meth)acrylic acid and the methoxypolyoxyethylene ether containing amino groups at the other end were used as reactants, and the polycarboxylic acid...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08F283/06C08F222/02C08F228/02C08F220/06C04B24/16C04B103/30
CPCC08F283/065C04B24/165C04B2103/302C08F222/02C08F228/02C08F220/06Y02W30/91
Inventor 李叶青李宇鹏余松柏袁媛曹东萍杨沫
Owner HUAXIN CEMENT
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