Saccharide-based water reducing agent and preparation method thereof

A water-reducing agent and sugar-based technology, applied in the field of sugar-based water-reducing agent and its preparation, can solve the problems of running pulp, increasing the ineffective adsorption of water-reducing agent, workability and the like

Active Publication Date: 2020-07-07
JIANGSU SOBUTE NEW MATERIALS +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The gradation of this kind of artificially processed sand and gravel aggregate is difficult to control, and the content of stone powder is high, which not only increases the ineffective adsorption of the water reducing agent, but also easily leads to workability problems such as bleeding and grouting in the prepared concrete. How to improve The application status of this kind of artificially processed sand and gravel aggregate in concrete is the general consensus and research hotspot of practitioners in the industry

Method used

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  • Saccharide-based water reducing agent and preparation method thereof
  • Saccharide-based water reducing agent and preparation method thereof
  • Saccharide-based water reducing agent and preparation method thereof

Examples

Experimental program
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preparation example Construction

[0044] (1) Preparation of glycosyl polyether P:

[0045] Weigh 100 parts of sucrose into the reactor, add 0.2 parts of sodium hydroxide and 20 parts of ethylene glycol dimethyl ether in sequence, seal the reaction kettle, start the mechanical stirring, and replace with nitrogen three times. Then raise the temperature to 100°C, feed 20 parts of ethylene oxide, and after the induced reaction in the reactor starts (temperature rises, pressure drops), control the temperature of the reactor between 100 and 130°C, and the pressure of the reactor ≤0.4MPa, Continue to feed 464 parts of ethylene oxide. After feeding, keep warm for 30 minutes, cool down to 80°C and discharge to obtain 601 parts of light brown polyether, which is marked as P-1. The weight average molecular weight of the polyether is 1984 after testing.

[0046] In the same way, the following sugar-based polyethers were prepared for the synthesis of sugar-based water reducers.

[0047] Preparation of glycosyl polyether ...

preparation example 1

[0054] Weigh 100.0 parts of glycosyl polyether P-1 into the reactor, add 1.0 part of cross-linking agent phosphoric acid (85%), seal the reactor, and start mechanical stirring. Raise and keep the temperature at about 100°C, and react for 3.0h under the condition of vacuum degree of -0.08~-0.1MPa. Then add 10.0 parts of maleic anhydride, control the temperature of the reactor at 120° C., and react for 5.0 hours under normal pressure. Cool down to 50°C and discharge, neutralize with 32% sodium hydroxide aqueous solution to pH = 6-7 and dilute to 40-50% to obtain a light wine red sugar-based water reducer, which is designated as TJS-1. The tested sugar-based water reducer has a weight average molecular weight of 5394 and a molecular weight distribution of 1.54.

preparation example 2

[0056] Weigh 100.0 parts of glycosyl polyether P-2 into the reactor, add 3.0 parts of cross-linking agent polyphosphoric acid, seal the reactor, and start mechanical stirring. Raise and keep the temperature at about 120°C, and react for 4.0h under the condition of vacuum degree of -0.08~-0.1MPa. Then add 20.0 parts of phthalic anhydride, control the temperature of the reactor at 105° C., and react for 7.0 hours under normal pressure. Cool down to 50°C and discharge, neutralize with 32% sodium hydroxide aqueous solution to pH = 6-7 and dilute to 40-50% to obtain a light wine red sugar-based water reducer, which is designated as TJS-2. The tested sugar-based water reducer has a weight average molecular weight of 7579 and a molecular weight distribution of 1.47.

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Abstract

The invention discloses a saccharide-based water reducing agent and a preparation method thereof. The saccharide-based water reducing agent is of a hyperbranched structure, wherein firstly short polyether side chains with adjustable hydrophilicity and hydrophobicity are grafted to polyhydroxy saccharide monomers, then the hyperbranched structure is formed through cross-linking of a phosphate esterification reaction, and finally carboxylic acid adsorption groups are grafted to the tail ends of part of the polyether side chains through a carboxylic acid esterification reaction. According to theinvention, a short polyether side chain is introduced into hydroxyl of a saccharide monomer through ethoxylation reaction; the slow setting workability characteristic of the saccharide monomer is reserved, polyether prepared from the saccharide monomer introduced with the polyether side chain is easily flowing liquid at room temperature or after being heated, and the reaction efficiency and the reaction effect with a cross-linking agent, acid anhydride and the like are improved.

Description

technical field [0001] The invention relates to a sugar-based water reducer and a preparation method thereof, belonging to the field of concrete admixtures. Background technique [0002] As a building material, concrete is widely used in many fields. Concrete admixture is an essential component of concrete, which can adjust and improve the working performance of concrete materials, and plays a central role in concrete production technology. Commonly used admixtures in concrete include water reducer and slump retaining agent, sugar, sodium sugar, maltodextrin and hydroxymethyl cellulose are also commonly used admixtures in concrete. Such admixtures can improve the retention of concrete. properties such as slump, setting time, and workability. [0003] With the development of the concrete industry and the impact of environmental protection policies, natural sand and gravel aggregates have decreased sharply, and artificial recycled materials such as machine-made sand and aband...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08G65/335C08G65/332C08G83/00C04B24/32C04B24/28C04B103/30
CPCC08G65/3353C08G65/3326C08G65/3322C08G83/006C04B24/32C04B24/28C04B2103/30
Inventor 张志勇冉千平黄振杨勇张建纲王亮王秀梅王涛
Owner JIANGSU SOBUTE NEW MATERIALS
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