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Preparation method of retarding and water reducing agent

A technology of retarding water-reducing agent and anhydrous ethanol, which is applied in the field of preparing retarding water-reducing agent, can solve the problems of complicated raw material processing and difficult industrial production, and achieves improved mechanical properties, small slump loss, and avoidance of temperature crack effect

Inactive Publication Date: 2014-04-23
LIUZHOU ZHENGLING GROUP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the traditional retarding superplasticizer has complicated raw material handling and difficult industrial production.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0018] A preparation method of retarding water reducing agent includes the following steps:

[0019] 1) Oxidation: Take raw sweet potato starch to prepare water-soluble starch milk with a mass percentage of 55-60%, adjust the pH to 8-9 with sodium hydroxide, and then add 12ml of sodium hypochlorite dropwise, and oxidize in a constant temperature water bath at 40°C for 4 hours Then add appropriate amount of sodium bisulfite to stop the reaction, filter, wash, and blow dry at 50°C for 6 hours to obtain oxidized sweet potato starch;

[0020] 2) Acidification: Use absolute ethanol to prepare the oxidized sweet potato starch obtained in step 1) into a suspension with a mass percentage of 30-40%, add 1.5% concentrated hydrochloric acid, stir for 2 hours at room temperature, neutralize, filter and wash Blow drying at 50°C for 6 hours to obtain acidified oxidized sweet potato starch;

[0021] 3) Etherification: The acidified oxidized sweet potato starch obtained in step 2) is prepared into ...

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Abstract

The invention discloses a preparation method of a retarding and water reducing agent. The preparation method comprises the following steps: 1) oxidization: oxidizing the raw material sweet potato starch; 2) acidification: acidifying the oxidized sweet potato starch with hydrochloric acid; and 3) etherification: adding ethylene oxide to the acidified oxidized sweet potato starch in the nitrogen environment to obtain the retarding and water reducing agent. The preparation method of the retarding and water reducing agent provided by the invention has the beneficial effect that the simple and easy-to-get raw material sweet potato starch is taken as the major raw material, and the operation of the preparation method is simple and convenient.

Description

technical field [0001] The invention relates to a preparation method of a retarding water reducer. Background technique [0002] The retarded high-efficiency superplasticizer is a retarded high-efficiency superplasticizer made of sodium naphthalenesulfonate formaldehyde condensate and compounded with various surface active substances. High water reducing rate, good fluidity, small loss of slump over time, no segregation, no bleeding. At the same time, it can greatly improve the fluidity of concrete and the strength of all ages, especially in the later stage. It has obvious enhancement effect. However, the traditional retarding superplasticizer has complex raw material handling and difficult industrial production. Contents of the invention [0003] The object of the present invention is to provide a method for preparing a retarded water reducer with simple and easy-to-obtain raw materials and easy operation for the above-mentioned defects in the prior art. [0004] In or...

Claims

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Application Information

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IPC IPC(8): C04B24/38C04B103/30C04B103/22
Inventor 唐萍
Owner LIUZHOU ZHENGLING GROUP
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