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A water-reducing composite modified starch thickener, its preparation method and application

A composite modification, water-reducing technology, applied in the field of concrete admixtures, can solve the problems of affecting early strength, slow dissolution, limited use, etc., and achieve the effects of low price, good water solubility and good adaptability

Active Publication Date: 2017-08-15
JIANGSU SOBUTE NEW MATERIALS +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, when the temperature is low, the retarder will affect the early strength, and its use is limited; although the thickener can effectively reduce bleeding, it will reduce the slump / expansion of the concrete, and more water reducers are needed. Some thickeners are expensive, dissolve slowly, and have poor adaptability to water reducing agents, which will make construction more difficult
[0004] As for concrete high-efficiency thickeners, there is currently no product on the market that has wide adaptability and excellent performance, can effectively control the workability of concrete, and has good adaptability to other admixtures

Method used

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  • A water-reducing composite modified starch thickener, its preparation method and application
  • A water-reducing composite modified starch thickener, its preparation method and application
  • A water-reducing composite modified starch thickener, its preparation method and application

Examples

Experimental program
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Effect test

Embodiment 1

[0033] Put 100 parts of DE=5 maltodextrin in the reaction kettle, add water dissolved in anhydrous sodium sulfate to adjust the concentration of the solution to 40%, dissolve 15 parts of anhydrous sodium sulfate in every 100 parts of water, then add 1.25 parts of sodium hydroxide, Stir at room temperature for 0.5h, blow nitrogen to remove the air, add 17.5 parts of propylene oxide, seal the reaction vessel, place it at 40°C for 18 hours, wash with absolute ethanol after the reaction, and dry to obtain etherified maltodextrin; take 50 parts of ether Prepare maltodextrin with pyridine to a concentration of 40%, add 0.3 parts of sodium hydroxide, stir at room temperature for 0.5 h, then add 20 parts of 1,3-propane sultone, react at room temperature for 8 h, wash with absolute ethanol , filtered, and dried to obtain the sample. Finally, after the product was dissolved in 262 parts of water, the pH was adjusted to 7.2 with 2.4 parts of 1mol / L sodium hydroxide solution, and the soli...

Embodiment 2

[0035] Put 100 parts of DE=2 maltodextrin in the reaction kettle, add water dissolved in anhydrous sodium sulfate to adjust the solution concentration to 40%, dissolve 5 parts of anhydrous sodium sulfate in every 100 parts of water, then add 0.5 parts of sodium hydroxide, Stir at room temperature for 0.5h, blow nitrogen to remove the air, add 10 parts of propylene oxide, seal the reaction vessel, place it at 30°C for 24 hours, wash with absolute ethanol after the reaction, and dry to obtain etherified maltodextrin; take 50 parts of ether Prepare maltodextrin with pyridine to a concentration of 40%, add 0.5 parts of sodium hydroxide, stir at room temperature for 0.5 h, then add 10 parts of 1,3-propane sultone, react at room temperature for 12 h, wash with absolute ethanol , filtered, and dried to obtain the sample. Finally, after dissolving the product in 245 parts of water, adjust the pH to 7.6 with 1.7 parts of 1mol / L sodium hydroxide solution, and the solid content of the pr...

Embodiment 3

[0037] Put 100 parts of DE=8 maltodextrin in the reaction kettle, add water dissolved in anhydrous sodium sulfate to adjust the concentration of the solution to 40%, dissolve 25 parts of anhydrous sodium sulfate in every 100 parts of water, then add 2 parts of sodium hydroxide, Stir at room temperature for 0.5h, blow nitrogen to remove the air, add 25 parts of propylene oxide, seal the reactor, place it at 50°C for 12 hours, wash with absolute ethanol after the reaction, and dry to obtain etherified maltodextrin; take 50 parts of ether Prepare maltodextrin with pyridine to make 40% concentration, add 0.1 part of sodium hydroxide, stir at room temperature for 0.5 h, then add 30 parts of 1,3-propane sultone, react at room temperature for 4 h, wash with absolute ethanol , filtered, and dried to obtain the sample. Finally, after the product was dissolved in 256 parts of water, the pH was adjusted to 7.5 with 4 parts of 1mol / L sodium hydroxide solution, and the solid content of the...

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Abstract

The invention provides a water-reducing composite modified starch thickener, its preparation method and application. The water-reducing composite modified starch thickener of the present invention is after etherification and modification of maltodextrin molecules, and then introducing sulfonic acid groups. The water-reducing composite modified starch thickener of the present invention has a good thickening effect on concrete, significantly improves the workability of concrete, and also has a certain water-reducing effect, showing that it is compatible with water-reducing agents and air-entraining agents. , retarder and other good adaptability.

Description

technical field [0001] The invention relates to a water-reducing composite modified starch thickener, a preparation method and application thereof, and belongs to the field of concrete admixtures. Background technique [0002] Nowadays, with the rapid development of engineering technology, it has become the main development direction for concrete to have high fluidity and long-distance transportation. Therefore, high-efficiency water reducers are the key materials for its development, but in practical applications, it will also bring There are some problems, such as poor workability, segregation and bleeding, which seriously affect the work. The analysis principle is that during concrete mixing, the settlement of aggregates (sand) leads to segregation; the further settlement of fine particles (cement, admixtures) leads to bleeding. If the viscosity of the slurry is too high, the fluidity is poor; if the viscosity is too small, it is easy to segregate and bleed. So how to c...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B24/16C04B103/30
Inventor 吴井志乔敏吕志锋佘维娜冉千平
Owner JIANGSU SOBUTE NEW MATERIALS
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