Preparation of hyperbranched starch-based water reducing agent

A water-reducing agent and starch-based technology, applied in the field of modified starch water-reducing agents, can solve the problems of poor fluidity and long retardation time of water-reducing agent, so as to improve the retarding performance, improve the water-reducing efficiency, and reduce the amount of addition. Effect

Inactive Publication Date: 2018-08-24
UNIV OF JINAN
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] In order to solve the problems of long retarding time and poor fluidity of the water reducer, the present invention provides a p

Method used

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  • Preparation of hyperbranched starch-based water reducing agent
  • Preparation of hyperbranched starch-based water reducing agent
  • Preparation of hyperbranched starch-based water reducing agent

Examples

Experimental program
Comparison scheme
Effect test

Embodiment approach 1

[0042] (1) Weigh 32.00g (0.1mol) starch and 150.00g (0.4mol) water, first add starch and water into a four-neck flask with a magnetic stirrer, then add an appropriate amount of ammonium persulfate 8.00g to dissolve, and then Add 8.00g of methacrylic acid, raise the temperature to 40°C, and react at normal pressure for 6h; cool down to room temperature, then add 8.00g (0.8mol) sodium styrene sulfonate, and react at room temperature for 4h; then add 8g of methallyl poly Oxyethylene ether was reacted for 4 hours to obtain pregelatinized starch.

[0043] (2) Using amidation, under the action of the condensing agent CDI, N-methylmorpholine is used as the organic base, acrylamide and maleic acid are used as monomers, and the condensation reaction is carried out in DMF under an ice-water bath. Reaction 12 ~48h, by repeatedly adding AB2 monomers, to control the number of hyperbranched generations, and synthesize the first and second generation hyperbranched polymers. Take a certain a...

Embodiment approach 2

[0046] (1) Weigh 32.00g (0.1mol) starch and 150.00g (0.4mol) water, first add starch and water into a four-neck flask with a magnetic stirrer, then add an appropriate amount of ammonium persulfate 8.00g to dissolve, and then Add 8.00g of methacrylic acid, raise the temperature to 40°C, and react at normal pressure for 6h; cool down to room temperature, then add 8.00g (0.8mol) sodium styrene sulfonate, and react at room temperature for 4h; then add 8g of methallyl poly Oxyethylene ether was reacted for 4 hours to obtain pregelatinized starch.

[0047] (2) Using amidation, under the action of the condensing agent CDI, N-methylmorpholine is used as the organic base, acrylamide and maleic acid are used as monomers, and the condensation reaction is carried out in DMF under an ice-water bath. Reaction 12 ~48h, by repeatedly adding AB2 monomers, to control the number of hyperbranched generations, and synthesize the first and second generation hyperbranched polymers. Take a certain a...

Embodiment approach 3

[0050] (1) Weigh 32.00g (0.1mol) starch and 150.00g (0.4mol) water, first add starch and water into a four-neck flask with a magnetic stirrer, then add an appropriate amount of ammonium persulfate 8.00g to dissolve, and then Add 8.00g of methacrylic acid, raise the temperature to 40°C, and react at normal pressure for 6h; cool down to room temperature, then add 8.00g (0.8mol) sodium styrene sulfonate, and react at room temperature for 4h; then add 8g of methallyl poly Oxyethylene ether was reacted for 4 hours to obtain pregelatinized starch.

[0051] (2) Using amidation, under the action of the condensing agent CDI, N-methylmorpholine is used as the organic base, acrylamide and maleic acid are used as monomers, and the condensation reaction is carried out in DMF under an ice-water bath. Reaction 12 ~48h, by repeatedly adding AB2 monomers, to control the number of hyperbranched generations, and synthesize the first and second generation hyperbranched polymers. Take a certain a...

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Abstract

The invention relates to the technical field of retarding high efficiency water reducers, in particular to application of hyperbranched starch-based water reducing agent with a terminal carboxyl hyperbranched polyamide-amine in improvement of flow property of concrete. The hyperbranched starch-based water reducing agent is synthesized by firstly carrying out pretreatment on starch, then synthesizing a terminal carboxyl hyperbranched polymer, and grafting hyperbranched polyamide-amine onto the pregelatinized starch. After being applied to the field of high efficiency water reducers, the hyperbranched starch-based water reducing agent can well improve the flowing property of the concrete; the hyperbranched starch-based water reducing agent is simple and convenient in synthesis process and suitable for industrial production, thus being a retarding high efficiency water reducer with excellent performance.

Description

technical field [0001] The invention relates to the technical field of modified starch water-reducer, in particular to a slow-setting high-efficiency water-reducer that is used for high water-reducing rate and good fluidity, and can improve the fluidity of concrete and the strength of various ages. Involving its preparation method. Background technique [0002] After the water reducer is mixed into the concrete mixture, the anion positioning group on the water reducer molecule is adsorbed on the surface of the cement particles, so that the cement particles are charged with the same kind of charge, resulting in electrostatic repulsion, and has a wetting and lubricating effect on the cement particles, so that The cement particles are more dispersed, the hydration efficiency is improved, the mixing water consumption is reduced, and the working performance of the concrete is improved. [0003] With the rapid development of highways, railways, and construction industries, the ap...

Claims

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Application Information

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IPC IPC(8): C08G81/02C08G83/00C08F251/00C08F285/00C08F283/08C08F220/06C08F220/38C04B24/16C04B103/30
CPCC04B24/16C04B2103/302C08F251/00C08F283/08C08F285/00C08G81/028C08G83/005C08F220/06C08F220/382
Inventor 寿崇琦郭鹏飞王德卫
Owner UNIV OF JINAN
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