Dual-modified maltodextrin high efficiency water reducing agent and preparation method thereof

A high-efficiency water reducer and maltodextrin technology, applied in the field of concrete admixtures, can solve the problems of useless by-products, oxidation, etc., and achieve the effect of good water solubility and great advantages in water reducing performance

Active Publication Date: 2015-04-29
JIANGSU SOBUTE NEW MATERIALS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, it is well known to those skilled in the art that it is not feasible to directly sulfonate starch with concentrated sulfuric acid, because concentrated sulfuric acid will carbonize and oxidize starch and produce a large amount of useless by-products

Method used

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  • Dual-modified maltodextrin high efficiency water reducing agent and preparation method thereof
  • Dual-modified maltodextrin high efficiency water reducing agent and preparation method thereof
  • Dual-modified maltodextrin high efficiency water reducing agent and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1-1

[0030] Add 0.56mol concentrated sulfuric acid into the reaction vessel, and place it in a constant temperature tank at -2°C (±2°C), then add 0.45mol ethanol dropwise to the reaction vessel with a constant pressure funnel, and keep stirring during the dropping process to prevent Local overheating, the whole dropping process takes 0.5h, then add 0.1mol maltodextrin with DE value of 2 to 10 into the mixture of concentrated sulfuric acid and ethanol, react for 4h, wash, filter, and vacuum dry to obtain sulfonated dextrin. Take 0.1 mol of the prepared sulfonated dextrin and 0.06 mol of glutaric anhydride and put them into another reaction vessel, mix them evenly, and then react at 80°C for 3 hours, then end, and finally dissolve the product in water and neutralize with alkali to obtain double-modified malt Dextrin superplasticizer.

Embodiment 1-2

[0032] Except that the maltodextrin whose DE value is 2-10 is adjusted to the maltodextrin whose DE value is 10-17, the others are the same as Example 1-1.

Embodiment 1-3

[0034] Except that the maltodextrin with a DE value of 10-17 is adjusted to the maltodextrin with a DE value of 17-20, the others are the same as in Example 1-1.

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Abstract

The invention provides a dual-modified maltodextrin high efficiency water reducing agent. The structural formula is disclosed as Formula I, wherein R1, R2 and R3 are respectively and independently sulfonate, mono dicarboxylate or hydrogen, and at least comprise one sulfonate (SO<3->) and one mono dicarboxylate. The invention also provides a preparation method of the water reducing agent. The preparation method comprises the following steps: diluting concentrated sulfuric acid with an organic solvent, carrying out sulfonation on maltodextrin at low temperature, carrying out esterification reaction on the sulfonation product by using dibasic acid anhydride, finally, dissolving the product in water, and adding an alkali for neutralization. The dual-modified maltodextrin high efficiency water reducing agent has the advantages of high water solubility and better water reducing performance than most naphthalene high efficiency water reducing agents at present, can be used as a cement water reducing agent, and has the characteristics of recoverability, no environmental pollution and the like.

Description

technical field [0001] The invention relates to a double-modified maltodextrin high-efficiency water reducer and a preparation method thereof, belonging to the field of concrete admixtures. Background technique [0002] Water reducer is an indispensable admixture for high-performance concrete. At present, naphthalene-based water-reducers are the most used in the market, as well as aliphatic, sulfamic acid-based and polycarboxylate-based water-reducers. However, because its main raw materials come from increasingly scarce fossil resources, the market price fluctuates greatly, and the process of raw material mining and refining and product synthesis will cause serious pollution to the environment. Therefore, it is necessary to develop raw materials with rich resources and less environmental pollution. new type of water reducer. [0003] Maltodextrin is a low-level starch hydrolysis product, which is a degradation product of starch through enzyme or acid treatment, including a...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08B30/18C04B24/38C04B103/30
Inventor 吴井志宋峰岩吕志锋佘维娜冉千平
Owner JIANGSU SOBUTE NEW MATERIALS
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