Looking for breakthrough ideas for innovation challenges? Try Patsnap Eureka!

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
View PDF2 Cites 18 Cited by
  • 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 preparation method of a hyperbranched modified starch water reducer for improving the fluidity of concrete and delaying its setting time

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • 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...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

No PUM Login to View More

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

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
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
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Patsnap Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Patsnap Eureka Blog
Learn More
PatSnap group products

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic, Popular Technical Reports.

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap|About US| Contact US: help@patsnap.com