Polycarboxylic acid and use thereof in cement

A polycarboxylic acid and application technology, applied in the field of polycarboxylic acid and its application in cement, can solve the problems of large dosage, poor flow retention or slump retention, small initial fluidity or slump, and achieve Meet the engineering requirements, improve the effect of water reduction and dispersion, prolong the effect of maintaining slump and fluidity

Active Publication Date: 2018-07-06
TSINGHUA UNIV
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  • 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

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  • Polycarboxylic acid and use thereof in cement
  • Polycarboxylic acid and use thereof in cement
  • Polycarboxylic acid and use thereof 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%.

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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

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Application Information

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Patent Type & Authority Applications(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
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