Polycarboxylic acid slump retaining agent for concrete and preparation method thereof

A technology of polycarboxylic acid and slump-retaining agent, which is applied in the field of concrete slump-retaining agent, can solve the problems of poor concrete workability, influence on concrete construction, and unstable plastic-retaining performance, and achieve stable plasticity, facilitate industrial production, The effect of stabilizing product quality

Active Publication Date: 2013-11-06
天津世纪天源集团股份有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] At present, the existing polycarboxylate slump-retaining agent does not have water-reducing rate, and the plastic-retaining performance is very unstable. When the concrete is transported to the construction site, the slump loss is too large or the tension is large, resulting in a change in the workability of the concrete. Poor, the pipe will be blocked during pumping, and the construction progress will be delayed
A large amount of organic solvents are used in the production process, which seriously pollutes the environment
The existing polycarboxylate slump-retaining agent has technical problems such as unstable quality and affecting concrete construction during the use of concrete

Method used

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  • Polycarboxylic acid slump retaining agent for concrete and preparation method thereof
  • Polycarboxylic acid slump retaining agent for concrete and preparation method thereof
  • Polycarboxylic acid slump retaining agent for concrete and preparation method thereof

Examples

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Comparison scheme
Effect test

Embodiment 1

[0035] A polycarboxylate slump-retaining agent for concrete, the weight percentage of each component is:

[0036]

[0037]

Embodiment 2

[0039] A kind of preparation method of polycarboxylate slump-retaining agent for concrete, its preparation comprises following technological steps:

[0040] 1. Add 40g of polyoxypropylene ether and 10g of water into the reaction vessel, and raise the temperature to 60°C to dissolve the polyoxypropylene ether in water. Adjust the pH between 4-6 with acrylic acid.

[0041] 2. Add 3g of hydrogen peroxide into the reaction kettle and stir for 10-20 minutes to fully dissolve the hydrogen peroxide.

[0042] 3. Dissolve the remaining acrylic acid (10 g in total), 2 g of mercapto acid, and 1 g of ascorbic acid in a small amount of water, and drop them into the reaction vessel within 3-5 hours.

[0043] 4. After the dropwise addition, keep warm for 1-2 hours.

[0044] 5. Regulate the ph value (6-7) with sodium hydroxide, add water and dilute to 40%, both obtain polycarboxylate slump retaining agent for concrete.

Embodiment 3

[0046] A kind of preparation method of polycarboxylate slump-retaining agent for concrete, its preparation comprises following technological steps:

[0047] 1. Add 50g of polyoxypropylene ether and 20g of water into the reaction vessel, and raise the temperature to 80°C to dissolve the polyoxypropylene ether in water. Adjust the pH between 4-6 with acrylic acid.

[0048] 2. Add 5g of hydrogen peroxide into the reaction vessel and stir for 10-20 minutes to fully dissolve the hydrogen peroxide.

[0049] 3. Dissolve the remaining acrylic acid (15 g in total), 3 g of mercapto acid, and 2 g of ascorbic acid in a small amount of water, and add them dropwise to the reaction vessel within 3-5 hours.

[0050] 4. After the dropwise addition, keep warm for 1-2 hours.

[0051] 5. Regulate the ph value (6-7) with sodium hydroxide, add water and dilute to 40%, both obtain polycarboxylate slump retaining agent for concrete.

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Abstract

The invention relates to a polycarboxylic acid slump retaining agent for concrete and a preparation method thereof, belonging to the technical field of concrete slump retaining agents. The polycarboxylic acid slump retaining agent for concrete comprises the following components in percentage by weight: 20-50% of polyoxypropylene ether, 25-60% of water, 3-5% of hydrogen peroxide, 10-15% of acrylic acid, 2-3% of mercapto acid and 1-2% of ascorbic acid. The preparation method comprises the following technological steps of: (1) adding polyoxypropylene ether and water into a reaction container, dissolving polyoxypropylene ether in water under the condition of stirring, and adjusting the ph value to 4-6 by using acrylic acid; (2) adding hydrogen peroxide into the reaction container, and dissolving hydrogen peroxide through stirring; (3) dissolving the rest acrylic acid, mercapto acid and ascorbic acid in water, and adding the solution into the reaction container in 3-5 hours; (4) reacting and maintaining the temperature for 1-2 hours; and (5) adjusting the ph value to 6-7 by using sodium hydroxide, and adding water to dilute to obtain the polycarboxylic acid slump retaining agent for concrete. The polycarboxylic acid slump retaining agent for concrete has good adaptability to cement and has the advantages of high plasticizing property, water-reducing rate, environmental protection, stable quality, reliable technology, high production efficiency, convenience for industrial production and the like.

Description

technical field [0001] The invention belongs to the technical field of concrete slump retaining agent, in particular to a polycarboxylic acid slump retaining agent for concrete and a preparation method thereof. Background technique [0002] At present, the existing polycarboxylate slump-retaining agent does not have a water-reducing rate, and its plastic-retaining performance is very unstable. When the concrete is transported to the construction site, the slump loss is too large or the tension is large, resulting in a change in the workability of the concrete. Poor, the pipe will be blocked during pumping, and the construction progress will be delayed. The production process needs to use a large amount of organic solvents, which seriously pollutes the environment. The existing polycarboxylate slump-retaining agent has technical problems such as unstable quality and influence on concrete construction during the use of concrete. Contents of the invention [0003] In order ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08F283/06
Inventor 江义刘玉恒范国荣
Owner 天津世纪天源集团股份有限公司
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