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Micromolecular concrete retarder and preparation method thereof

A technology for concrete and setting retarder, applied in the field of concrete adjuvants, can solve the problems of concrete strength, workability, poor weather resistance, corruption and odor, etc., and achieves excellent compatibility, good weather resistance and long shelf life. Effect

Active Publication Date: 2021-03-19
GUANGDONG REDWALL NEW MATERIALS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although there are many types of retarders, due to various reasons, there are not many retarders that can be used in actual production and construction. Although some retarders have achieved the control of setting time, the strength of concrete, The workability is affected, and some retarders are greatly affected by the environment. The molasses retarder may also appear corrupt and smelly during storage, and it is difficult to control when adjusting the setting time. When the dosage reaches There is no linear relationship between the coagulation time and the dosage at a certain amount, and if the dosage is too high, it may cause non-coagulation
Moreover, the existing retarder has poor weather resistance

Method used

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  • Micromolecular concrete retarder and preparation method thereof
  • Micromolecular concrete retarder and preparation method thereof
  • Micromolecular concrete retarder and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0049] As a kind of small molecule concrete retarder of the embodiment of the present invention, the chemical structure of described small molecule concrete retarder is as formula (1);

[0050]

[0051] The preparation method of the small molecule concrete retarder described in the present embodiment may further comprise the steps:

[0052] (1) Mix 1.8 mol of serine and 4 mol of 4-pentenoic acid in 9 mol of deionized water to obtain a mixed system A, add 0.2 mol of concentrated sulfuric acid to adjust the pH value of the mixed system A to 0;

[0053] (2) Control the temperature of the mixing system A to 120°C and add 4 mol of the compound propionaldehyde dropwise to the mixing system A, stir at a constant speed, mix and keep warm for 120 minutes, and cool to obtain the small molecule concrete retarder described in this example.

Embodiment 2

[0055] As a kind of small molecule concrete retarder of the embodiment of the present invention, the chemical structure of described small molecule concrete retarder is as formula (2);

[0056]

[0057] The preparation method of the small molecule concrete retarder described in the present embodiment may further comprise the steps:

[0058] (1) Mix 1.8mol ethylamine and 4.5mol acetic acid in 9mol deionized water to obtain mixed system A, add 0.2mol concentrated sulfuric acid to adjust the pH value of mixed system A to 0;

[0059] (2) Control the temperature of the mixing system A to 115°C and add 4.2 mol glyoxylic acid dropwise to the mixing system A, and stir at a constant speed, mix and keep warm for 60 minutes, and cool to obtain the small molecule concrete retarder described in this embodiment .

Embodiment 3

[0061] As a kind of small molecule concrete retarder of the embodiment of the present invention, the chemical structure of described small molecule concrete retarder is as formula (3);

[0062]

[0063] The preparation method of the small molecule concrete retarder described in the present embodiment may further comprise the steps:

[0064] (1) Mix 2 mol threonine and 4.2 mol 1-propanesulfonic acid in 9 mol deionized water to obtain a mixed system A, add 0.2 mol concentrated sulfuric acid to adjust the pH value of the mixed system A to 0;

[0065] (2) Control the temperature of the mixing system A to 125° C., add 4.2 mol propionaldehyde dropwise to the mixing system A, stir at a constant speed, mix and keep warm for 120 minutes, and cool to obtain the small molecule concrete retarder described in this example.

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Abstract

The invention provides a micromolecular concrete retarder. The chemical structure of the micromolecular concrete retarder is shown as a formula (I) or a formula (II). The micromolecular concrete retarder has strong metal complexing ability, can delay hydration reaction of mineral substances in cement, and can be used for prolonging initial setting time and final setting time of cement paste, mortar and concrete. The micromolecular concrete retarder disclosed by the invention has the advantages of difficult decay, long shelf life, obvious retarding effect and good weather resistance when beingapplied to concrete in a small mixing amount; the micromolecular concrete retarder provided by the invention has excellent compatibility with a water reducing agent product, and can also improve the slump loss resistance of concrete during working.

Description

technical field [0001] The invention relates to the field of concrete additives, in particular to a small molecule concrete retarder and a preparation method thereof. Background technique [0002] Concrete retarders regulate the setting time of concrete by delaying the hydration rate of cement. The initial and final setting time of concrete can be adjusted by using the appropriate retarder and dosage, so that the fresh concrete can maintain plasticity for a long time, realize long-distance concrete transportation, and meet the needs of concrete with special setting time. During construction in winter and summer, concrete will cause cracks due to temperature differences. In addition, in the process of mass concrete construction, the temperature difference caused by hydration heat may also cause cracks after concrete hardening. By adding Retarder can prevent cement concrete from cracking due to temperature difference. Therefore, retarder is an essential concrete admixture. ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B24/12C04B24/16C04B103/22
CPCC04B24/121C04B24/123C04B24/16C04B2103/22
Inventor 刘虎张小富赵利华粟鸽王子儒李宁
Owner GUANGDONG REDWALL NEW MATERIALS
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