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Preparation method for maleic anhydride esterified starch air-entraining and water-reducing agent

A technology of maleic anhydride ester and air-entraining water reducer, which is applied in the field of mortar or concrete water reducer, which can solve the problems of serious retardation, reduce water surface tension, improve early strength, and reduce excessive retardation problems Effect

Inactive Publication Date: 2018-02-16
ANHUI FUNAN LVYUAN CHEM
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Problems solved by technology

However, due to the excessive hydroxyl groups of sulfonated starch, its retardation is extremely s

Method used

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Embodiment Construction

[0024] A preparation method of maleic anhydride esterified starch air-entraining water reducer, comprising the following specific steps:

[0025] (1) Acid hydrolysis treatment of starch:

[0026] Weigh 60 parts by weight of starch, add water to form a 40% (w / w) starch suspoemulsion, and transfer it to a four-necked flask equipped with a thermometer and a stirring device, heat until the system temperature is 50°C, add 8 parts of concentration It is a 2mol / L hydrochloric acid solution, and the dropping rate is controlled, and the dropwise addition is completed within 1 hour, and the stirring reaction is continued for 3 hours;

[0027] At the end of the reaction, use 1mol / L of Na 2 CO 3 Neutralize the solution, filter, wash with distilled water 3 times, pulverize, dry at 55°C, pulverize through a 100-mesh sieve, and then dry in an oven for 8 hours before use;

[0028] (2) Microwave-H 2 o 2 Coupling activation:

[0029] Put the above-mentioned acid-hydrolyzed starch into a t...

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Abstract

The invention discloses a preparation method for a maleic anhydride esterified starch air-entraining and water-reducing agent. According to the invention, hydrochloric acid is used for acidolysis treatment of starch, so that the molecular chain of the starch is shortened, and the dispersing effect of the water-reducing agent on cement is facilitated; then microwave activation treatment is performed under H2O2 oxidizing conditions, so that hydroxyl groups in the molecular structure of the starch are oxidized into carboxyl groups, and the activity of a sulfonation reaction in a next step is increased, the sulfonation degree of the starch is improved, and the starch has the higher sulfonation degree; finally a part of remaining -OH and maleic anhydride in the starch are subjected to an esterification reaction to release the carboxyl groups, so that the contents of sulfo groups and the carboxyl groups in the prepared starch-based water-reducing agent are increased, the hardness and structural compactness of concrete are improved, and the frost resistance is improved; and besides, the content of hydroxyl groups of retarding groups in molecules of the water reducing agent is effectivelyreduced, the early-stage strength of the concrete is improved, moisture is effectively prevented from penetrating into the concrete, and therefore the water reducing effects and the frost resistance are improved.

Description

technical field [0001] The invention relates to a water reducer for mortar or concrete, in particular to a preparation method of a maleic anhydride esterified starch air-entraining water reducer. Background technique [0002] The natural conditions in the northern region are relatively harsh, with large temperature differences, strong winds and dry heat covering most areas, making the cement concrete pavement prone to peeling, broken boards, and crisp edges, etc., especially the damage caused by freeze-thaw slag to vehicle tires Extremely serious, affecting the normal use of the pavement. Therefore, it is of great significance to improve the flexural and frost resistance properties of pavement concrete. [0003] The air-entraining superplasticizer not only acts as an air-entraining agent, but also reduces the water consumption per unit of concrete, increases the strength of concrete, and compensates for the unfavorable factors that reduce the strength of concrete due to air...

Claims

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Application Information

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IPC IPC(8): C08B31/04C08B31/06C08B31/18C04B24/16C04B103/30
CPCC08B31/04C04B24/168C04B2103/302C08B31/06C08B31/18
Inventor 李磊
Owner ANHUI FUNAN LVYUAN CHEM
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