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

A viscosity-reducing polycarboxylate water-reducer containing double viscosity-reducing functional groups, its preparation method and application

A viscous polycarboxylic acid and water reducing agent technology, applied in the field of concrete admixtures, can solve the problems of reducing concrete shrinkage and cracking, reducing water evaporation shrinkage force, reducing the viscosity of cement paste, etc., so that the water reduction rate is not affected, Good viscosity reduction effect and low shrinkage effect

Active Publication Date: 2021-10-29
惠州市红墙化学有限公司
View PDF7 Cites 0 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Since the hydrophobic alkyl group and ester group are located on the PEG side chain, the water reducer of the present invention has the following four main advantages: 1. Its content does not affect the adsorption and dispersion of the copolymer-COO - 2. The content of hydrophobic alkyl groups and ester groups can be adjusted at will according to the actual needs of the viscosity-reducing effect, so as to effectively solve the problem of high viscosity and flow rate in high-grade concrete. The purpose of the slow problem; 3. Since the PEG side chain contains a large number of hydrophobic viscosity-reducing alkyl groups and ester groups, the water-reducer molecules cannot form a complete water layer film on the surface of cement particles, but form a collapsed water layer film with defects , this defective collapsed water film endows the superplasticizer with the following characteristics: (1) it can release more free water and reduce the viscosity of the cement paste; (2) the molecular weight of the superplasticizer is not subject to the requirement of viscosity reduction (3) The length of the PEG side chain is not limited by the requirement for viscosity reduction; 4. The introduction of a large number of hydrophobic alkyl groups and ester groups in the PEG side chain greatly reduces the surface tension of the product and reduces the shrinkage force of water evaporation , thereby reducing the shrinkage and cracking of concrete, and has a good shrinkage reduction effect

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
  • A viscosity-reducing polycarboxylate water-reducer containing double viscosity-reducing functional groups, its preparation method and application
  • A viscosity-reducing polycarboxylate water-reducer containing double viscosity-reducing functional groups, its preparation method and application
  • A viscosity-reducing polycarboxylate water-reducer containing double viscosity-reducing functional groups, its preparation method and application

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0052] The preparation method of the viscosity-reducing polycarboxylate water reducer of the present invention, the preparation method comprises the following steps:

[0053] (1) Synthesis of viscosity-reducing active macromonomer D:

[0054] In a four-necked glass flask equipped with a stirrer, a thermometer, a reflux condenser, and a dropping device, add 1 mol of methallyl alcohol, 2 g of sodium hydride, stir under nitrogen protection, and drop 30 mol of ring The oxyalkane was added dropwise in 3 hours, and the reaction was continued at 100°C for 8 hours to obtain the viscosity-reducing active macromonomer D.

[0055] (2) Synthesis of viscosity-reducing polycarboxylate superplasticizer

[0056] Dissolving reactive monomer B, reactive monomer C, reactive monomer D, and oxidizing agent in water to obtain solution 1, dissolving reactive monomer A and chain transfer agent in water to obtain solution 2, dissolving reducing agent in water to obtain solution 3, Under normal tempe...

Embodiment 2

[0060] The preparation method of the viscosity-reducing polycarboxylate water reducer of the present invention, the preparation method comprises the following steps:

[0061] (1) Synthesis of viscosity-reducing active macromonomer D:

[0062] In a four-necked glass flask equipped with a stirrer, a thermometer, a reflux condenser, and a dropping device, add 1 mol of methallyl alcohol, 2 g of sodium hydride, stir under nitrogen protection, and dropwise add 30 mol of shrink water at a constant speed at 90 ° C. Glycerin butyrate was added dropwise in 3 hours, and the reaction was continued at 100°C for 8 hours to obtain the viscosity-reducing active macromonomer D.

[0063] (2) Synthesis of viscosity-reducing polycarboxylate superplasticizer

[0064] Dissolving reactive monomer B, reactive monomer C, reactive monomer D, and oxidizing agent in water to obtain solution 1, dissolving reactive monomer A and chain transfer agent in water to obtain solution 2, dissolving reducing agent...

Embodiment 3

[0068] The preparation method of the viscosity-reducing polycarboxylate water reducer of the present invention, the preparation method comprises the following steps:

[0069] (1) Synthesis of viscosity-reducing active macromonomer D:

[0070] In a four-necked glass flask equipped with a stirrer, a thermometer, a reflux condenser, and a dropping device, add 1 mol of methallyl alcohol, 2 g of sodium hydride, stir under nitrogen protection, and dropwise add 15 mol of ring Oxyalkane and 15mol glycidyl butyrate were added dropwise in 3 hours, and the reaction was continued at 100°C for 8 hours to obtain the viscosity-reducing active macromonomer D.

[0071] (2) Synthesis of viscosity-reducing polycarboxylate superplasticizer

[0072] Dissolving reactive monomer B, reactive monomer C, reactive monomer D, and oxidizing agent in water to obtain solution 1, dissolving reactive monomer A and chain transfer agent in water to obtain solution 2, dissolving reducing agent in water to obtai...

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 provides a viscosity-reducing active macromonomer, and the invention also provides a viscosity-reducing polycarboxylate water-reducer. The viscosity-reducing polycarboxylate water-reducer synthesized by the invention has a Each functional group interacts synergistically. Compared with the viscosity-reducing polycarboxylate superplasticizer synthesized by the prior art, the viscosity-reducing effect is superior and the water-reducing rate is not affected. At the same time, due to the introduction of a large amount of hydrophobicity in the PEG side chain The alkyl group and ester group reduce the HLB value, enhance the surface activity effect, and have a good shrinkage reduction effect. The concrete mixed with the product of the invention has a low shrinkage rate and no cracking. The viscosity-reducing hydrophobic functional group is located on the side chain, and the viscosity-reducing effect of the water reducer can be adjusted through the content of the viscosity-reducing functional group, but it does not affect the content of the dispersing group and the dispersion effect on cement particles, so it does not affect the water reducing effect. agent dispersion and water-reducing effect.

Description

technical field [0001] The invention relates to the technical field of concrete admixtures, in particular to a viscosity-reducing polycarboxylate water-reducer containing double viscosity-reducing functional groups, a preparation method and application thereof. Background technique [0002] In recent years, with the increase of my country's infrastructure construction, high-grade concrete is gradually entering the building material market due to its high strength, good integrity and low weight, especially in bridge engineering. However, due to the use of a large amount of gel material and low water-binder ratio, high-grade concrete has the problems of high viscosity and slow flow speed, which in turn causes problems in concrete mixing, transportation, pumping and construction, which largely limits high-strength super Promotion and application of high-strength concrete. [0003] For engineers and technicians, the high-strength ultra-high-strength concrete viscosity problem i...

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
Patent Type & Authority Patents(China)
IPC IPC(8): C08G65/28C08F283/06C08F220/06C04B24/26C04B103/30
Inventor 张小富白淑英
Owner 惠州市红墙化学有限公司
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