Supercharge Your Innovation With Domain-Expert AI Agents!

Gradient slow-release polycarboxylate superplasticizer as well as preparation method and application thereof

A slow-release polycarboxylic acid and water-reducing agent technology, applied in the field of water-reducing agents, can solve the problems of affecting the construction progress and construction quality, difficult to maintain the slump of concrete for a long time, and the slow-release time is limited. Time and preparation method are simple and easy to operate, and the effect of expanding the scope of application

Active Publication Date: 2021-11-26
GUANGZHOU INSTITUTE OF BUILDING SCIENCE CO LTD
View PDF4 Cites 2 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the slow-release time of a single slump-preserving monomer is limited, and the commonly used hydroxyethyl acrylate has the problem of too fast a slow-release rate, which makes it difficult to achieve long-term slump-proofing of concrete, which seriously affects the construction progress and construction quality.

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
  • Gradient slow-release polycarboxylate superplasticizer as well as preparation method and application thereof
  • Gradient slow-release polycarboxylate superplasticizer as well as preparation method and application thereof
  • Gradient slow-release polycarboxylate superplasticizer as well as preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0038] A gradient slow-release polycarboxylate superplasticizer HS-1, prepared by the following method:

[0039] (1) Weigh 330 parts of methallyl polyoxyethylene ether (molecular weight 3000Da), 15 parts of acrylic acid, 15 parts of hydroxyethyl acrylate, 12.5 parts of hydroxypropyl acrylate, 4 parts of sodium hypophosphite, 10 parts of ferrous sulfate Aqueous solution (concentration 0.3wt%), 0.45 parts of ascorbic acid, 2.5 parts of hydrogen peroxide.

[0040] (2) Mix methallyl polyoxyethylene ether, 2.5 parts of hydroxypropyl acrylate, sodium hypophosphite and ferrous sulfate aqueous solution, add 330 parts of water to obtain solution A.

[0041] (3) Mix acrylic acid, hydroxyethyl acrylate and 10 parts of hydroxypropyl acrylate, and add 60 parts of water to obtain solution B.

[0042] (4) Mix ascorbic acid with 60 parts of water to obtain solution C.

[0043] (5) At 20°C, add hydrogen peroxide to solution A and mix evenly. At the same time, start to add solution B and solu...

Embodiment 2

[0046] A gradient slow-release polycarboxylate superplasticizer HS-2, prepared by the following method:

[0047] (1) Weigh 350 parts of isopentenol polyoxyethylene ether (molecular weight 3300Da), 16 parts of methacrylic acid, 18 parts of hydroxyethyl acrylate, 14.5 parts of hydroxyethyl methacrylate, 5 parts of sodium methacrylate , 12 parts of ferrous sulfate aqueous solution (concentration 0.3wt%), 0.5 part of sodium formaldehyde sulfoxylate, 3.0 parts of hydrogen peroxide.

[0048] (2) Mix prenol polyoxyethylene ether, 3.5 parts of hydroxyethyl methacrylate, sodium methacrylate and ferrous sulfate aqueous solution, and add 350 parts of water to obtain solution A.

[0049] (3) Mix methacrylic acid, hydroxyethyl acrylate and 11 parts of hydroxyethyl methacrylate, and add 60 parts of water to obtain solution B.

[0050] (4) Mix sodium formaldehyde sulfoxylate with 60 parts of water to obtain solution C.

[0051] (5) At 20°C, add hydrogen peroxide to solution A and mix evenl...

Embodiment 3

[0053] A gradient slow-release polycarboxylate superplasticizer HS-3, prepared by the following method:

[0054] (1) Weigh 360 parts of methyl alkenyl polyoxyethylene ether (molecular weight 3000Da), 16 parts of acrylic acid, 20 parts of hydroxyethyl acrylate, 4 parts of hydroxypropyl methacrylate, 10 parts of hydroxypropyl acrylate, 5 parts of Sodium phosphate, 10 parts of ferrous sulfate aqueous solution (0.3 wt%), 0.6 parts of sodium bisulfite, 3.0 parts of hydrogen peroxide.

[0055] (2) Mix methyl alkenyl polyoxyethylene ether, hydroxypropyl methacrylate, sodium hypophosphite and ferrous sulfate aqueous solution, add 360 parts of water to obtain solution A.

[0056] (3) Mix acrylic acid, hydroxyethyl acrylate and hydroxypropyl acrylate, and add 60 parts of water to obtain solution B.

[0057] (4) Mix sodium bisulfite with 60 parts of water to obtain solution C.

[0058] (5) At 20°C, add hydrogen peroxide to solution A and mix evenly. At the same time, start to add solut...

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 gradient slow-release polycarboxylate superplasticizer as well as a preparation method and application thereof, and relates to the technical field of superplasticizers. The gradient slow-release polycarboxylate superplasticizer is prepared from the following raw materials in parts by weight: 320 to 360 parts of ether monomers, 14 to 18 parts of unsaturated acid, 15 to 20 parts of slump retaining monomers, 12 to 16 parts of long slump retaining monomers, 3 to 6 parts of a chain transfer agent, 8 to 12 parts of a metal catalyst, 0.4 to 0.8 part of a reducing agent and 2 to 3 parts of an oxidizing agent, wherein the slump retaining monomer is selected from at least one of hydroxyethyl acrylate, terminated amide phosphate, maleic anhydride and dimethylamino ethyl acrylate, and the long slump retaining monomer is selected from at least one of hydroxyethyl methyl acrylate, hydroxypropyl acrylate and hydroxypropyl methacrylate. The gradient slow-release polycarboxylate superplasticizer has a gradient slow-release effect, the slump retaining time of the polycarboxylate superplasticizer can be remarkably prolonged, and the requirement of long-distance transportation is met.

Description

technical field [0001] The invention relates to the technical field of water reducers, in particular to a gradient slow-release polycarboxylate water reducer and its preparation method and application. Background technique [0002] With the development of society, the urban population density is increasing, and the number of high-rise buildings is also increasing. The construction of high-rise buildings is faced with the problem of long-distance transportation of concrete, which raises the requirement for concrete to maintain fluidity for a long time. At the same time, in recent years, based on the purpose of environmental protection, the reduction of dependence on natural aggregates has been encouraged, and some natural aggregates have been replaced by machine-made sand or artificial sand. However, the existing machine-made sand or artificial sand still has high silt content. , poor quality and other issues, the requirements for the slump performance of concrete admixtures ...

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 Applications(China)
IPC IPC(8): C08F283/06C08F220/06C08F220/28C04B24/32C04B24/16C04B103/30
CPCC08F283/065C04B24/32C04B24/166C04B2103/302C08F220/06C08F220/20
Inventor 张金龙黄福仁邵强钟开红
Owner GUANGZHOU INSTITUTE OF BUILDING SCIENCE CO LTD
Features
  • R&D
  • Intellectual Property
  • Life Sciences
  • Materials
  • Tech Scout
Why Patsnap Eureka
  • Unparalleled Data Quality
  • Higher Quality Content
  • 60% Fewer Hallucinations
Social media
Patsnap Eureka Blog
Learn More

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

© 2025 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap|About US| Contact US: help@patsnap.com