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

Polycarboxylic acid and its use in cement

A technology of polycarboxylic acid and sulphoaluminate cement, which is applied in the field of polycarboxylic acid and its application in cement, and can solve the problem of small initial fluidity or slump, large dosage, poor flow retention or slump retention problems such as prolonging the maintenance of slump and fluidity, meeting engineering requirements, and improving the effect of water reduction and dispersion

Active Publication Date: 2020-07-21
TSINGHUA UNIV
View PDF4 Cites 0 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At the same time, the particle surface properties of cement particles and hydration product phases are different, resulting in the failure of traditional polycarboxylate superplasticizers to be successfully applied to sulphoaluminate cement systems.
The main problems are insufficient dispersion performance in concrete, small initial fluidity or slump, large dosage, poor flow retention or slump retention, etc.

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
  • Polycarboxylic acid and its use in cement
  • Polycarboxylic acid and its use in cement
  • Polycarboxylic acid and its use in cement

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0058] Synthesis of PCE4000-10: Weigh 82g of water and 50g of HPEG, dissolve and mix evenly, pour into a three-necked flask in a constant temperature water bath, stir at a constant speed of 150rpm with the stirring paddle and raise the temperature to 65°C, weigh 0.37g of HPEG with a mass concentration of 30% 2 o 2 Added to the three-necked flask. Mix 9g AA and 24g water uniformly to prepare dropwise A, and mix 0.204g3-MPA, 0.125gVc and 25g water uniformly to prepare dropwise B. Drop A and drop B are added dropwise into the three-necked flask through a peristaltic pump at a constant speed. The drop time for A is 3 hours, and the time for B drop is 3.5 hours. After the dropwise addition is completed, keep warm for 1 h. After the reaction, the actual solid content test was carried out, and the test result was 29.8%.

Embodiment 2

[0060] Synthesis of PCE4000-12: Weigh 82g of water and 50g of HPEG, dissolve and mix evenly, pour into a three-neck flask in a constant temperature water bath, stir at a constant speed of 150rpm with the stirring paddle and raise the temperature to 65°C, weigh 0.37g of HPEG with a mass concentration of 30% 2 o 2 Added to the three-necked flask. Mix 10.8g AA and 24g water uniformly to prepare dropwise A, and mix 0.241g3-MPA, 0.147gVc and 25g water uniformly to prepare dropwise B. Drop A and drop B are added dropwise into the three-necked flask through a peristaltic pump at a constant speed. The drop time for A is 3 hours, and the time for B drop is 3.5 hours. After the dropwise addition is completed, keep warm for 1 h. After the reaction, the actual solid content test was carried out, and the test result was 28.9%.

Embodiment 3

[0062] Synthesis of PCE4000-16: Weigh 150g of water and 80g of HPEG, dissolve and mix evenly, pour into a three-neck flask in a constant temperature water bath, stir at a constant speed of 150rpm with the stirring paddle and heat up to 65°C, weigh 0.77g of HPEG with a mass concentration of 30% 2 o 2 Added to the three-necked flask. Mix 23.04g AA and 50g water uniformly to prepare dropwise A, and mix 0.505g3-MPA, 0.308gVc and 30g water uniformly to prepare dropwise B. Drop A and drop B are added dropwise into the three-necked flask through a peristaltic pump at a constant speed. The drop time for A is 3 hours, and the time for B drop is 3.5 hours. After the dropwise addition is completed, keep warm for 1 h. After the reaction, the actual solid content test was carried out, and the test result was 28.4%.

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

This invention relates to a polycarboxylic acid and use thereof in cement. The polycarboxylic acid has a comb-shaped structure and is formed through random copolymerization of a first monomer A, an unsaturated carboxylic acid monomer B and a functional monomer C, wherein the first monomer is selected from at least one of unsaturated polyether monomers and unsaturated polyester monomers, and the molar ratio of each polymer is A:B:C = 1:(8-50):(0-5). The polycarboxylic acid used as a dispersing agent can greatly extend and effectively control retention of cement collapsbillity and fluidity underthe condition of without addition of retarders, and does not bleed water, thereby meeting engineering requirements.

Description

technical field [0001] The invention relates to a polycarboxylic acid and its application in cement. Background technique [0002] Concrete is one of the widely used materials in the world, and cement is an important part of it as a cementitious material. According to performance, cement can be divided into: 1) General cement, the cement usually used in general civil construction projects, mainly refers to: six types of cement specified in GB175-2007, namely Portland cement, ordinary Portland cement, slag silicic acid Salt cement, pozzolanic Portland cement, fly ash Portland cement and composite Portland cement; 2) Special cement refers to cement with special purpose, such as G grade oil well cement, road Portland cement; 3 ) Characteristic cement: refers to a certain kind of cement with outstanding performance. Such as: rapid hardening portland cement, low heat slag portland cement, expansive sulfoaluminate cement, aluminophosphate cement and phosphate cement. Although t...

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): C08F283/06C08F283/01C08F220/06C08F220/14C04B24/26C04B103/30C04B103/40
CPCC04B24/2605C04B24/2694C04B2103/302C04B2103/408C08F283/01C08F283/065C08F220/06C08F220/14
Inventor 孔祥明田红伟
Owner TSINGHUA UNIV
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