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Cement water-reducing agent and preparation method thereof

A water-reducing agent and cement technology, applied in the chemical industry, can solve the problems of poor water-reducing dispersing ability and slump-preserving effect of the water-reducing agent, and achieve the effect of strong dispersion and water reduction, moderate molecular weight, and surface tension reduction.

Inactive Publication Date: 2018-08-24
钱万琦
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The technical problem to be solved by the present invention is to solve the problem that the current water-reducing agent will be absorbed by the mud in the cement concrete aggregate. With the increase of the mud content, the water-reducing and dispersing ability of the water-reducing agent will seriously decrease, and the slump-preserving effect will be poor. , provide a kind of cement water reducing agent and preparation method thereof

Method used

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  • Cement water-reducing agent and preparation method thereof

Examples

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Comparison scheme
Effect test

Embodiment 1

[0026]Sieve particles: Take calcium lignosulfonate and add distilled water at a mass ratio of 1:2 to stir and mix, then add 10% of calcium lignosulfonate to sulfuric acid with a mass fraction of 10% and mix, and stir and mix at 35°C for 40 minutes to obtain a mixture Mixture, take the stirred mixture according to the mass ratio of 10:3:1, add hydrogen peroxide and sodium bisulfite with a mass fraction of 30%, mix, heat up to 75°C, stir and mix for 3 hours, centrifuge, and take the supernatant according to the mass ratio of 1:8 Add absolute ethanol for mixing, filter, take the precipitate, grind and pulverize it through a 100-mesh sieve, and collect the sieved particles.

[0027] Wenlun rubber: purchased from Shanghai Shunshui Chemical Co., Ltd.

[0028] Water reducer base material: (1) In parts by mass, take 20 parts of isopentenol polyoxyethylene ether, 5 parts of butyl acrylate, 70 parts of deionized water, 5 parts of hydrogen peroxide with a mass fraction of 10%, 12 1 part...

Embodiment 2

[0034] Sieve particles: Take calcium lignosulfonate and add distilled water at a mass ratio of 1:2 to stir and mix, then add 20% of the mass of calcium lignosulfonate to sulfuric acid with a mass fraction of 10% and mix, stir and mix at 45°C for 50 minutes to obtain Mixture, take the stirred mixture according to the mass ratio of 10:3:1, add hydrogen peroxide and sodium bisulfite with a mass fraction of 30%, mix, heat up to 85°C, stir and mix for 4 hours, centrifuge, and take the supernatant according to the mass ratio of 1:8 Add absolute ethanol for mixing, filter, take the precipitate, grind and pulverize it through a 100-mesh sieve, and collect the sieved particles.

[0035] Wenlun rubber: purchased from Shanghai Shunshui Chemical Co., Ltd.

[0036] Water reducer base material: (1) In parts by mass, take 30 parts of isopentenol polyoxyethylene ether, 8 parts of butyl acrylate, 90 parts of deionized water, 9 parts of hydrogen peroxide with a mass fraction of 10%, 15 parts 1...

Embodiment 3

[0042] Sieve particles: Take calcium lignosulfonate and add distilled water at a mass ratio of 1:2 to stir and mix, then add 15% of calcium lignosulfonate to sulfuric acid with a mass fraction of 10% and mix, stir and mix at 40°C for 45 minutes to obtain a mixture Mixture, take the stirred mixture according to the mass ratio of 10:3:1, add hydrogen peroxide and sodium bisulfite with a mass fraction of 30%, mix, heat up to 80°C, stir and mix for 3 hours, centrifuge, and take the supernatant according to the mass ratio of 1:8 Add absolute ethanol for mixing, filter, take the precipitate, grind and pulverize it through a 100-mesh sieve, and collect the sieved particles.

[0043] Wenlun rubber: purchased from Shanghai Shunshui Chemical Co., Ltd.

[0044] Water reducer base material: (1) In parts by mass, take 25 parts of isopentenol polyoxyethylene ether, 7 parts of butyl acrylate, 80 parts of deionized water, 7 parts of hydrogen peroxide with a mass fraction of 10%, 13 1 part of...

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Abstract

The invention discloses a cement water-reducing and a preparation method thereof, and belongs to the field of chemical engineering. The cement water-reducing agent is characterized in that octenyl succinic acid starch ester and ethyecellulose are used as raw materials, and welangum is embedded; octenyl succinic acid starch ester is high in emulsifying performance and emulsifying stability and forms a viscoelastic film under the mutual effect of macromolecules, thus realizing the emulsifying effect; and the welangum is high in mobility, and the slow releasing and water holding effects of the welangum are achieved; welangum is generally used as an outstanding thickening agent or a segregation resisting agent. According to the water-reducing agent, a carboxylic acid group in the molecular structure of the component of the water-reducing agent is of electronegativity type and can be attached to the surfaces, with positive charge, of cement particles, so that the cement particles can be dispersed, and as a result, the mobility of cement slurry is improved; and the problems that a current water-reducing agent is absorbed by mud in a cement concrete aggregate, and the water reducing capacity and the dispersing capacity of the water-reducing agent highly decrease as the mud content increases, and the slump loss resisting effect is low can be solved.

Description

technical field [0001] The invention belongs to the field of chemical industry, and in particular relates to a cement water reducer and a preparation method thereof. Background technique [0002] Water reducer is a concrete admixture that can reduce the amount of mixing water while maintaining the slump of concrete. Most of them are anionic surfactants, such as lignosulfonate, naphthalenesulfonate formaldehyde polymer, etc. After being added to the concrete mixture, it can disperse the cement particles, improve its workability, reduce the unit water consumption, improve the fluidity of the concrete mixture, or reduce the unit cement consumption and save cement. [0003] Several water reducers commonly used in the market are: lignosulfonate sodium salt water reducer, naphthalene-based high-efficiency water reducer, polycarboxylic acid high-efficiency water reducer, etc. Lignosulfonate: It is a common water reducer, and its raw material is lignin, which is generally extracte...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B24/26C04B24/16C08F283/06C08F220/06C08F220/18C08F220/20C08F285/00C08F228/02C04B103/30
CPCC04B24/165C04B24/2694C04B40/0039C04B2103/302C08F283/065C08F285/00C08F220/06C08F228/02C04B24/02C04B24/04C04B24/124C04B24/00C04B24/20C04B24/16C04B24/38C04B24/383C04B24/18C04B22/14
Inventor 钱万琦庄文琴刘红妹
Owner 钱万琦
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