Oxidation-sulfonation starch water reducing agent preparation method

A technology of sulfonated starch and oxidized starch, applied in the field of concrete water reducing agent, can solve the problems of unreachable and limited starch utilization means, and achieve the effects of reducing water consumption, improving strength, and improving compressive and flexural strength

Inactive Publication Date: 2017-03-22
MIANYANG MOSHI TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The existing methods for the utilization of starch are limited, and the expected goal cannot be achieved.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0016] Prepare 20% starch milk according to starch and water, put it into a three-necked flask, heat it in a water bath at 30°C, adjust the pH value of the starch milk to 9 with sodium hydroxide, slowly add 4% sodium hypochlorite dropwise, and stir for 3 hours. Stop the reaction, filter, wash and dry to obtain oxidized starch; mix oxidized starch and formamide into 15% starch milk, prepare a three-necked flask, control the temperature to 0°C, and slowly add 5% 1: The mixture of 1 chlorosulfonic acid and formamide is reacted for 1 hour, then the reaction is terminated, filtered, washed and dried to obtain the product oxidized-sulfonated starch.

[0017] When the product is used as a water-reducing agent in cement, when the mixing amount is 0.6%, the fluidity of the cement paste reaches 260mm, and the cement paste sets for 16h. The compressive strength ratios of 3d, 7d, and 28d cement mortar are 111, 111, and 105, respectively. The method for determining the fluidity of cement pas...

Embodiment 2

[0019] Prepare 30% starch milk according to starch and water, put it into a three-necked flask, heat it in a water bath at 35℃, adjust the pH value of the starch milk to 11 with sodium hydroxide, slowly add 4% sodium hypochlorite dropwise, and stir for 3.5h. , Stop the reaction, filter, wash and dry to prepare oxidized starch; mix oxidized starch and formamide into 20% starch milk, make a three-necked flask, control the temperature to room temperature, and then slowly add 5% 1: The mixture of 1 chlorosulfonic acid and formamide is reacted for 1 hour, then the reaction is terminated, filtered, washed and dried to obtain the product oxidized-sulfonated starch.

[0020] When the product is used as a water-reducing agent in cement, when the mixing amount is 0.5%, the fluidity of the cement slurry reaches 280mm, and the cement slurry coagulates for 20h. The 3d, 7d, and 28d cement mortar compressive strength ratios are 110, 109, and 108, respectively.

Embodiment 3

[0022] Prepare 30% starch milk according to starch and water, put it into a three-necked flask, heat it in a water bath at 40°C, adjust the pH of the starch milk to 10 with sodium hydroxide, slowly add 4% sodium hypochlorite dropwise, and stir for 4 hours. Stop the reaction, filter, wash and dry to obtain oxidized starch; mix oxidized starch and formamide into 25% starch milk, make a three-necked flask, control the temperature to room temperature, and then slowly add 5% 1:1 dropwise The mixture of chlorosulfonic acid and formamide is reacted for 2h, then the reaction is terminated, and the product is oxidized-sulfonated starch after filtering, washing and drying.

[0023] When the product is used as a water-reducing agent in cement, when the mixing amount is 0.7%, the fluidity of the cement slurry reaches 300mm, and the cement slurry coagulates for 24h. The compressive strength ratios of 3d, 7d and 28d cement mortar are 120, 118 and 110 respectively.

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PUM

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Abstract

The invention discloses an oxidation-sulfonation starch water reducing agent preparation method, which comprises: adding water to a reaction kettle, adding 20-40% of corn starch while stirring, adjusting the pH value of the starch milk to 9-11 with an alkaline substance, adding an oxidizing agent while stirring, continuously carrying out the stirring reaction for 3-5 h at a temperature of 30-45 DEG C, adjusting with an acid to achieve a neutral state, filtering, and drying to obtain oxidation starch; and adding an organic solvent to a reaction kettle, adding 10-15% of the oxidation starch while stirring, controlling the temperature at 0-60 DEG C, slowly adding an acidic substance and organic solvent mixture in a dropwise manner, stirring for 1-2 h, terminating the reaction, filtering, and drying so as to obtain the oxidation-sulfonation starch. According to the present invention, the process of the preparation method is simple; after the product is added to cement, the cement slurry has good fluidity and good retardability; after the product is added to mortar, the advantages of fluidity increasing, water consumption reducing, compressive strength increasing and bending strength increasing can be provided; and after the product is added to concrete, the slump of the concrete can be increased, and the strength is improved.

Description

Technical field [0001] The invention belongs to the technical field of concrete water reducers, and particularly relates to a preparation method of an oxidized-sulfonated starch water reducer. Background technique [0002] While maintaining the same workability of fresh concrete, the admixture that can significantly reduce water consumption is called concrete water reducer, also known as dispersant or plasticizer. It is the most commonly used concrete admixture. According to my country's standard for concrete admixtures (GB8076-1997), water reducing agents with a water reducing rate equal to or greater than 5% are called ordinary water reducing agents or plasticizers; water reducing agents with a water reducing rate equal to or greater than 10% It is called a superplasticizer or superplasticizer. According to the effect of water reducing agent on concrete setting time and strength growth and whether it has air-entraining function, water reducing agent is divided into retarding wa...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B24/16C04B103/30
Inventor 赵平蒋旺林
Owner MIANYANG MOSHI TECH CO LTD
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