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Preparation method of starch sulfonate

A technology of starch sulfonate and starch, which is applied in the fields of chemical industry and concrete building materials, can solve the problems of large slump loss and poor fluidity of concrete, and achieve good pumpability, temperature insensitivity, and process simple effect

Active Publication Date: 2016-05-11
CHINA RAILWAY 12TH BUREAU GRP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] The present invention provides a method for preparing starch sulfonate in order to solve the problems of large loss of slump over time and poor fluidity of concrete

Method used

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  • Preparation method of starch sulfonate
  • Preparation method of starch sulfonate
  • Preparation method of starch sulfonate

Examples

Experimental program
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Effect test

Embodiment 1

[0012] Embodiment 1: A kind of preparation method of starch sulfonate, the dextrin that directly buys is dissolved in water and water is used as dispersant and sodium bisulfite is used as sulfonating agent, after heating reaction, adjust pH value to be 7 with sodium hydroxide to obtain liquid Be starch sulfonate, comprise the steps:

[0013] Add 200 parts by mass of deionized water, 120 parts by mass of dextrin and 80 parts of sodium bisulfite into a three-necked flask, heat up to 75°C, keep the temperature for 2 hours, and adjust the pH to 7 with a NaOH solution with a mass percentage concentration of 35%. It is starch sulfonate, and after spray drying, it becomes powdery starch sulfonate.

Embodiment 2

[0014] Embodiment 2: A kind of preparation method of starch sulfonate, the dextrin prepared by starch is dissolved in water and water is used as dispersant and sodium bisulfite is used as sulfonating agent, after heating reaction, adjust pH value to 7 with sodium hydroxide to obtain liquid namely Be starch sulfonate, comprise the steps:

[0015] (1) Preparation of dextrin by enzymatic method: Prepare starch milk with a concentration of 30%, add 0.3 parts of amylase, control the temperature at 50°C, and react at a pH of 4.0. The reaction is terminated when the DE value is 10-20, and then 100°C Heat for 3 to 5 minutes to inactivate the enzyme;

[0016] (2) Add 220 parts by mass of deionized water, 100 parts by mass of dextrin and 100 parts of sodium bisulfite into a three-neck flask, raise the temperature to 95°C, keep it warm for 3 hours, and adjust the pH to 7 with a NaOH solution with a concentration of 35% by mass. The obtained liquid is starch sulfonate, which is powdery s...

Embodiment 3

[0017] Embodiment 3: A kind of preparation method of starch sulfonate, the dextrin prepared by starch is dissolved in water and water is used as dispersant and sodium bisulfite is used as sulfonating agent, after heating reaction, adjust pH value to 7 with sodium hydroxide to obtain liquid namely Be starch sulfonate, comprise the steps:

[0018] (1) Preparation of dextrin by enzymatic method: Prepare starch milk with a concentration of 45%, add 0.5 parts of amylase, control the temperature at 60°C, and react at a pH of 5.0. The reaction is terminated when the DE value is 10-20, and then 100°C Heat for 3 to 5 minutes to inactivate the enzyme;

[0019] (2) Add 140 parts by mass of deionized water, 70 parts by mass of dextrin and 50 parts of sodium bisulfite into a three-neck flask, raise the temperature to 85°C, keep it warm for 1 hour, and adjust the pH to 7 with a NaOH solution with a concentration of 35% by mass. The obtained liquid is starch sulfonate, which is powdery star...

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Abstract

The invention belongs to the technical fields of chemical industry and concrete construction materials. In order to solve the problems of high slump constant time loss and lower flowability in the concrete, the invention provides a preparation method of starch sulfonate. The preparation method comprises the following steps: dissolving dextrin prepared from starch or directly purchased dextrin in water, heating to react by using water as a dispersing agent and sodium bisulfite as a sulfonating agent, and regulating the pH value to 7 with sodium hydroxide to obtain a liquid which is the starch sulfonate. The invention uses the method for preparing starch sulfonate by using water as the medium and sodium bisulfite as the sulfonating agent for the first time, which is different from the preparation method by using dichloromethane or any other organic solvent as the medium in the prior art. The method has the advantages of simple technique, environment friendliness and no pollution emission, and is beneficial to industrial production. The product has favorable synergic dispersion properties for cement particles, solves the problems of poor slump retaining effect and poor workability in the existing retarder for concrete, use of toxic solvents in the preparation process, and difficulty in treating sulfonating agent byproduct chlorine ions. The invention provides a novel preparation method of starch sulfonate.

Description

technical field [0001] The invention belongs to the technical fields of chemical engineering and concrete building materials, and in particular relates to a preparation method of starch sulfonate. Background technique [0002] In concrete construction, the tricalcium aluminate content and alkali content of cement, the ignition loss of fly ash, and the mud content of sand and gravel will all affect the water-reducing and slump-preserving effect of polycarboxylate-based superplasticizers, making the concrete The loss of slump over time is large, and the fluidity becomes poor, which affects the construction of the project. The commonly used solution at present is to increase the amount of water reducing agent to improve the ability to maintain the initial fluidity of cement paste over time, but it will increase the cost of water reducing agent. In order to save trouble, some people directly add water during construction to increase the fluidity and increase the water-cement ra...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08B31/06C04B24/16
CPCC04B24/168C04B2103/308C08B31/06
Inventor 李茜茜李全堂
Owner CHINA RAILWAY 12TH BUREAU GRP
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