Preparation method of oxidation-etherification starch used as concrete water reducer

A technology of concrete water reducing agent and etherified starch, which is applied in the field of preparation of starch chemical derivatives, can solve the problem of no water reducing effect, etc., and achieves the effect of solvent recycling, excellent performance and easy transportation.

Inactive Publication Date: 2010-01-27
SICHUAN HUASHI GREEN HOMELAND BUILDING MATERIALS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Simple oxidized starch and etherified starch have no water-reducing effect

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] A preparation method of oxidized-etherified starch used as concrete water reducer, comprising the following steps:

[0024] a, the preparation of oxidized starch:

[0025] Get starch, add water and be mixed with the starch milk that the weight percent composition of starch is 30%, adjust the pH value of starch milk with 3% (weight percent, hereinafter the same) aqueous solution of sodium hydroxide to be 9, add oxidizing agent sodium hypochlorite, add The amount is 6% of the starch weight, heated in a water bath at 40°C, oxidized at a constant temperature at 40°C for 4 hours, then neutralized with aqueous hydrochloric acid to a pH value of 7-8, and added 10% sodium bisulfite to the amount (weight) of the oxidant sodium hypochlorite Mixing, terminating the reaction, filtering, washing, and drying to obtain oxidized starch with a carboxyl content of 0.36%;

[0026] b. Preparation of oxidized-etherified starch:

[0027] Disperse the oxidized starch in absolute ethanol to ...

Embodiment 2

[0029] A preparation method of oxidized-etherified starch used as concrete water reducer, comprising the following steps:

[0030] a, the preparation of oxidized starch:

[0031] Get starch, add water and be mixed with the starch milk that the weight percent content of starch is 30%, adjust the pH value of starch milk with 3% aqueous sodium hydroxide solution to be 9, heat in a water bath at 40° C., add oxidant sodium hypochlorite to be 10% of the starch quality. %, constant temperature oxidation at 40°C for 4h, then neutralized by hydrochloric acid solution, and simultaneously add 10% sodium bisulfite in the amount of oxidizing agent (weight) to terminate the reaction, filter, wash, and dry to obtain oxidized starch with a carboxyl content of 0.5%;

[0032] b. Preparation of oxidized-etherified starch:

[0033] Disperse oxidized starch in absolute ethanol to prepare a suspension with an oxidized starch content of 30% to 40%, adjust the pH of the suspension to 10 with 3% aque...

Embodiment 3

[0035] A preparation method of oxidized-etherified starch used as concrete water reducer, comprising the following steps:

[0036] a, the preparation of oxidized starch:

[0037] Get starch, add water and be mixed with starch milk whose weight percent content of oxidized starch is 30%, adjust the pH value of starch milk with 3% sodium hydroxide aqueous solution to be 9, heat in a water bath at 40 ° C, add oxidant sodium hypochlorite to make the starch milk 8%, oxidized at a constant temperature at 40°C for 4 hours, then neutralized with hydrochloric acid solution, and simultaneously added 10% sodium bisulfite to terminate the reaction, filtered, washed, and dried to obtain oxidized starch with a carboxyl content of 0.36%;

[0038] b. Preparation of oxidized-etherified starch:

[0039] Disperse the oxidized starch in absolute ethanol to prepare a suspension with an oxidized starch content of 30% to 40%, adjust the pH of the suspension to 10 with 3% aqueous sodium hydroxide sol...

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PUM

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Abstract

The invention relates to a preparation method of oxidation-etherification starch used as concrete water reducer. The preparation method is characterized by comprising the following steps: adding water into starch to prepare starch milk with moisture content of 20-40 percent; adjusting the pH value to 9-11; adding sodium hypochlorite as an oxidant the weight of which is 6-10 percent of the weight of the starch, mixing and reacting for 3-4h at the temperature of 35-40 DEG C under stirring; neutralizing until the pH value is 7-8; adding sodium bisulfite the weight of which is 5-15 percent of the weight of the oxidant to stop the reaction; filtering, washing and drying to obtain oxidized starch; dispersing the oxidized starch into absolute alcohol to prepare suspension with the concentration of 30-40 percent; adjusting the pH to 9-11; adding a mixed solution of oxacyclopropane and absolute alcohol and mixing; placing the mixture in an airtight reactor and reacting for 16-24h at the temperature of 40-45 EDG C under the protection nitrogen; neutralizing until the pH value is 7-8; and filtering, washing the solid with the absolute alcohol and drying to obtained the oxidation-etherification starch product. The preparation process is environmental-friendly and innocuous and has excellent performance when used as the water reducer.

Description

technical field [0001] The invention belongs to a method for preparing starch chemical derivatives, and relates to a method for preparing oxidized-etherified starch used as a concrete water reducing agent. The prepared oxidized-etherified starch is suitable for use as a water reducer and retarder for concrete. Background technique [0002] Water reducing agent is a kind of concrete admixture with water reducing function. After adding water reducing agent to concrete, high performance concrete with fluidity meeting construction requirements, low water-cement ratio and high strength can be formulated, and dense self-compacting concrete can be formed by self-flowing, and a large amount of industrial waste such as powder can be mixed. Coal ash, slag and other fine admixtures can improve the durability of concrete and improve some environmental problems caused by industrial development. In the prior art, naphthalene-based water-reducers and polycarboxylate-based water-reducers ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08B31/00C08B31/18C08B31/10C04B24/38C04B103/30C04B103/22
Inventor 严云胡志华王田堂
Owner SICHUAN HUASHI GREEN HOMELAND BUILDING MATERIALS
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