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Concrete slump retaining agent to which methylcellulose is added and preparation method thereof

A technology of methyl cellulose and concrete, which is applied in the field of concrete slump-retaining agent added with methyl cellulose and its preparation, which can solve the problems of excessive slump loss of high-efficiency water-reducing agent, etc., and achieve obvious slump-retaining effect 、To overcome the effect of too large and too fast slump loss

Inactive Publication Date: 2015-12-09
徐明
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The purpose of the present invention is to provide a concrete slump-retaining agent added with methyl cellulose and its preparation method. Adding the slump-retaining agent in the process of concrete construction can overcome the shortcomings of high-efficiency water reducer slump loss too large and too fast , the effect of slump preservation is obvious, it can maintain the fluidity of freshly mixed concrete, and creates favorable conditions for the use of commercial concrete

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] A concrete slump-retaining agent added with methyl cellulose, the components and the mass parts of each component are as follows: 1 part of methyl cellulose, 6 parts of polyacrylamide, 2 parts of calcium formate, 1.0 part of sucrose, itaconic acid 4 parts, 0.5 parts of methallyl polyoxyethylene ether, 8 parts of monoethanolamine, 3 parts of formic acid, 0.5 parts of phosphoric acid, 5 parts of sodium methacrylate, 3 parts of sodium styrene sulfonate, 0.1 parts of p-toluenesulfonic acid 4.7 parts of methacrylic acid, 1.0 parts of sodium gluconate, 5 parts of sodium hydroxide, and 15 parts of water.

[0020] The preparation method comprises the steps of:

[0021] 1) Mix monoethanolamine with formic acid and phosphoric acid and add itaconic acid into the reaction kettle. Under the protection of nitrogen, heat up to 70°C at a heating rate of 0.5°C / min. Add methyl cellulose and continue to heat up to 100°C. The rate is 0.5°C / min, the constant temperature reaction is 1h, and...

Embodiment 2

[0026] A concrete slump-retaining agent added with methyl cellulose, the components and the mass parts of each component are as follows: 6 parts of methyl cellulose, 10 parts of polyacrylamide, 6 parts of calcium formate, 3.2 parts of sucrose, itaconic acid 8 parts, 1.5 parts of methallyl polyoxyethylene ether, 20 parts of monoethanolamine, 7 parts of formic acid, 1.5 parts of phosphoric acid, 12 parts of sodium methacrylate, 8 parts of sodium styrene sulfonate, 0.5 parts of p-toluenesulfonic acid 9.5 parts of methacrylic acid, 2.2 parts of sodium gluconate, 15 parts of sodium hydroxide, and 20 parts of water.

[0027] The preparation method comprises the steps of:

[0028] 1) Mix monoethanolamine with formic acid and phosphoric acid and add itaconic acid into the reaction kettle. Under the protection of nitrogen, heat up to 90°C with a heating rate of 2°C / min. Add methyl cellulose and continue to heat up to 120°C. The rate was 2°C / min, the constant temperature was reacted fo...

Embodiment 3

[0033] A concrete slump-retaining agent added with methyl cellulose, the components and the mass parts of each component are as follows: 4.2 parts of methyl cellulose, 8.3 parts of polyacrylamide, 4.3 parts of calcium formate, 2.3 parts of sucrose, and itaconic acid 6.5 parts, 1.1 parts of methallyl polyoxyethylene ether, 14 parts of monoethanolamine, 4.7 parts of formic acid, 1.1 parts of phosphoric acid, 8.1 parts of sodium methacrylate, 5.2 parts of sodium styrene sulfonate, 0.3 parts of p-toluenesulfonic acid 7.1 parts of methacrylic acid, 1.6 parts of sodium gluconate, 10 parts of sodium hydroxide, and 17 parts of water.

[0034] The preparation method comprises the steps of:

[0035] 1) Mix monoethanolamine with formic acid and phosphoric acid and add itaconic acid into the reaction kettle. Under the protection of nitrogen, heat up to 80°C with a heating rate of 1°C / min. Add methyl cellulose and continue to heat up to 110°C. The rate was 1°C / min, the constant temperatur...

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Abstract

The invention discloses a concrete slump retaining agent to which methylcellulose is added and a preparation method thereof. The concrete slump retaining agent is prepared from, by mass, 1-6 parts of methylcellulose, 6-10 parts of polyacrylamide, 2-6 parts of calcium formate, 1.0-3.2 parts of saccharose, 4-8 parts of itaconic acid, 0.5-1.5 parts of methyl allyl polyethenoxy ether, 8-20 parts of monoethanolamine, 3-7 parts of formic acid, 0.5-1.5 parts of phosphoric acid, 5-12 parts of sodium methallyl sulfonate, 3-8 parts of sodium p-styrenesulfonate, 0.1-0.5 part of p-toluenesulfonic acid, 4.7-9.5 parts of methacrylic acid, 1.0-2.2 parts of gluconic acid sodium salt, 5-15 parts of sodium hydroxide and 15-20 parts of water.

Description

technical field [0001] The invention belongs to the technical field of concrete admixtures, and in particular relates to a concrete slump-retaining agent added with methyl cellulose and a preparation method thereof. Background technique [0002] With the vigorous development of the commercial concrete industry for construction, concrete admixtures in my country have been widely used in recent years, among which the Cai series sulfonate formaldehyde condensate type high-efficiency water reducer, melamine sulfonate formaldehyde condensate type high-efficiency water reducer Water agent, lignosulfonate water reducer, sugar calcium water reducer, etc. are used in large amounts. These superplasticizers endow fresh concrete with good fluidity and strength, which can basically meet the construction needs for on-site mixing. But for commercial concrete, there is a common problem of excessive slump loss. At present, there are many ways to solve the slump loss of concrete, and the fol...

Claims

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Application Information

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IPC IPC(8): C04B24/38
Inventor 徐明
Owner 徐明
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