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Ultra retarder for concrete and preparation method for ultra retarder

A super retarder and concrete technology, applied in the field of chemical building materials, can solve the problems of reducing the strength of the base, short retarding time, etc., and achieve the effect of improving compressive strength, long retarding time, and easy industrial production

Active Publication Date: 2012-08-01
CHINA STATE CONSTR READY MIXED CONCRETE CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although the above-mentioned retarder can prolong the molding time of the mixture of cement-stabilized pavement base to more than 6 hours, the retarding time is relatively short when used in concrete
In addition, excessive dosage will reduce the strength of the base

Method used

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  • Ultra retarder for concrete and preparation method for ultra retarder
  • Ultra retarder for concrete and preparation method for ultra retarder
  • Ultra retarder for concrete and preparation method for ultra retarder

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] Weigh 220g of dimethyl phosphite and put it into a four-necked flask, and slowly put 98g of maleic anhydride and 0.38g of catalyst ferrous sulfate into the above-mentioned flask, stir and dissolve evenly, then raise the temperature to 100°C, keep warm and reflux for 6 hours, and the reaction is complete After cooling to room temperature, 40 wt% sodium hydroxide solution was added to react until the pH of the system reached 6-8, and the solvent was removed by distillation under reduced pressure to obtain the required retarder.

Embodiment 2

[0033] Weigh 85g of phosphorous acid dissolved in 100g of acetic acid and put it into a four-necked flask, and slowly put 98g of maleic anhydride and 0.2g of catalyst ferric sulfate into the above-mentioned flask, stir and dissolve evenly, then raise the temperature to 90°C, keep warm and reflux for 4 hours, and the reaction is complete After cooling to room temperature, sodium hydroxide solution was added to adjust the pH of the solution to 7, and the solvent was removed to obtain the desired super retarder.

Embodiment 3

[0035] Weigh 69g of diethyl phosphite and put it into a four-necked flask, and put 25g of succinic anhydride and 0.1g of catalyst ferrous sulfate into the above flask, stir and dissolve evenly, then raise the temperature to 85°C, keep warm and reflux for 5 hours, cool down after the reaction is completed to room temperature, add sodium hydroxide solution to react until the pH of the system reaches 7, and obtain the required super retarder.

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PUM

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Abstract

The invention relates to an ultra retarder for concrete and a preparation method for the ultra retarder. The ultra retarder for the concrete is characterized by being obtained by the steps of reacting one of phosphorous acid and phosphonate diester and cyclo-anhydride with 4 to 8 carbon atoms in a molar ratio of (1-2.5):1 at the temperature of between 85 and 150 DEG C under the catalytic action of a metal salt catalyst, cooling, and adding an alkaline solution to adjust pH of a system to be 6 to 8. The ultra retarder is long in delayed coagulation time, the initial coagulation time is more than or equal to 24 hours, and the delayed coagulation effect can be controlled through a mixing amount; the concrete which is prepared by using the ultra retarder has a later-period enhancement effect;the preparation method is simple and environment-friendly; and by the method, industrial production is easy to realize.

Description

technical field [0001] The invention relates to a super retarder for concrete and a preparation method thereof, belonging to the field of chemical building materials. Background technique [0002] Retarder is a chemical admixture widely used in concrete today. It can delay the hydration rate of cement, adjust the setting time of concrete, and improve the construction performance of concrete. There are many types of retarders, and sucrose, citric acid, sodium gluconate, and inorganic phosphate are commonly used at present. In the production of ready-mixed concrete, it is often necessary to add a certain amount of retarder to keep the fresh concrete plastic for a long time, which is convenient for the transportation and pouring of concrete. [0003] With the development of society and the advent of high-performance concrete, various large-scale projects and high-rise buildings are also emerging, the application range of retarders is also expanding, and the performance requir...

Claims

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Application Information

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IPC IPC(8): C04B24/04C04B103/22
Inventor 黄波王军刘明王婵唐玉超
Owner CHINA STATE CONSTR READY MIXED CONCRETE CO LTD