Anti-sulfate competitive adsorption type silane modified polycarboxylate water reducing agent and preparation method thereof

A technology of competitive adsorption and silane modification, which is applied in the field of polycarboxylate superplasticizer and its preparation, can solve the problems of reduced dispersion and retention performance of polycarboxylate superplasticizer, changes in setting time and dispersion retention performance, and concrete slump. The problems such as the increase of time loss can be solved, and the effect of low total porosity, good fluidity and high compactness can be achieved

Inactive Publication Date: 2016-09-21
TONGJI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, simply increasing the adsorption capacity of polycarboxylate superplasticizers cannot completely resist the competitive adsorption of sulfates, and will also lead to a decrease in the dispersion and retention performance of polycarboxylate superplasticizers, that is, an increase in concrete slump loss over time
This is because the initial adsorption amount of the polycarboxylate water reducer is too large, the amount of water redu

Method used

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  • Anti-sulfate competitive adsorption type silane modified polycarboxylate water reducing agent and preparation method thereof
  • Anti-sulfate competitive adsorption type silane modified polycarboxylate water reducing agent and preparation method thereof
  • Anti-sulfate competitive adsorption type silane modified polycarboxylate water reducing agent and preparation method thereof

Examples

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Embodiment 1

[0032] A sulfate-resistant competitive adsorption type silane-modified polycarboxylate water reducer, made of the following components in parts by weight: 100 parts of isobutylene alcohol polyoxyethylene ether, 3 parts of acrylic acid, and 10 parts of γ-methacryloyl Oxypropyltrimethoxysilane, 1.0 parts of ammonium persulfate, 0.4 parts of hydrogen peroxide, 0.5 parts of L-ascorbic acid, 1.0 parts of mercaptopropionic acid, 160 parts of water.

[0033] The concrete preparation method of above-mentioned water reducing agent is as follows:

[0034] Put isobutylene alcohol polyoxyethylene ether and a certain amount of tap water into the reaction container, and use a stirring device to dissolve all the raw materials; put ammonium persulfate, hydrogen peroxide, γ-methacryloxypropyltrimethoxysilane, etc. into the above reaction at one time Container, using a stirrer to mix the system evenly; heat the reaction system and control the system temperature to be constant at 70°C, and at th...

Embodiment 2

[0037] A sulfate-resistant competitive adsorption type silane-modified polycarboxylate water reducer, made of the following components in parts by weight: 100 parts of isobutylene alcohol polyoxyethylene ether, 5 parts of acrylic acid, and 4 parts of γ-methacryloyl Oxypropyltrimethoxysilane, 0.5 parts of ammonium persulfate, 0.4 parts of hydrogen peroxide, 0.4 parts of L-ascorbic acid, 0.6 parts of mercaptopropionic acid, 130 parts of water.

[0038] The concrete preparation method of above-mentioned water reducing agent is as follows:

[0039] Put isobutylene alcohol polyoxyethylene ether and a certain amount of tap water into the reaction container, and use a stirring device to dissolve all the raw materials; put ammonium persulfate, hydrogen peroxide, γ-methacryloxypropyltrimethoxysilane, etc. into the above reaction at one time container, using a stirrer to mix the system evenly; heat the reaction system and control the temperature of the system to be constant at 60°C, and s...

Embodiment 3

[0041] A sulfate-resistant competitive adsorption type silane-modified polycarboxylate water reducer, made of the following components in parts by weight: 100 parts of isobutylene alcohol polyoxyethylene ether, 4 parts of acrylic acid, and 6 parts of γ-methacryloyl Oxypropyltrimethoxysilane, 0.7 parts of ammonium persulfate, 0.6 parts of hydrogen peroxide, 0.4 parts of L-ascorbic acid, 1.0 parts of mercaptopropionic acid, 160 parts of water.

[0042] The concrete preparation method of above-mentioned water reducing agent is as follows:

[0043] Put isobutylene alcohol polyoxyethylene ether and a certain amount of tap water into the reaction container, and use a stirring device to dissolve all the raw materials; put ammonium persulfate, hydrogen peroxide, γ-methacryloxypropyltrimethoxysilane, etc. into the above reaction at one time container, use a stirrer to mix the system evenly; heat the reaction system and control the temperature of the system to be constant at 50°C, and a...

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Abstract

The invention relates to an anti-sulfate competitive adsorption type silane modified polycarboxylate water reducing agent and a preparation method thereof; the water reducing agent has the structural formula represented by the formula defined in the specification, wherein a, b and c are each an integer of 1-99, and n is an integer of 30-50. The water reducing agent is prepared by the following method: (1) weighing isobutylene alcohol polyoxyethylene ether and water, and mixing and dissolving; (2) then adding ammonium persulphate, hydrogen peroxide and gamma-methacryloxypropyl trimethoxysilane, and mixing evenly; (3) heating the reaction system obtained in the step (2), and at the same time, respectively dropping the pre-dissolved acrylic acid, L-ascorbic acid and a chain transfer agent to the reaction system; and (4) after the completion of dropping, fully stirring the reaction system to cure, then adding a neutralization alkali, neutralizing to the pH of 6-7, and thus obtaining the target product. Compared with the prior art, the water reducing agent has the advantages of strong adsorption action with a cement-based material, good anti-sulfate competitive adsorption effect, good compatibility with cement, simple preparation process and the like.

Description

technical field [0001] The invention relates to a polycarboxylate water reducer and a preparation method thereof, in particular to a sulfate-competitive adsorption-resistant silane-modified polycarboxylate water reducer and a preparation method thereof. Background technique [0002] Polycarboxylate superplasticizers are widely used in high performance concrete because of their high dispersibility and high water reducing rate. Polycarboxylate superplasticizers are mainly adsorbed on the surface of cement minerals through the negatively charged functional groups on the main chain, such as carboxyl groups and sulfonic acid groups. The force acts to disperse the cement particles. However, the adsorption of polycarboxylate superplasticizers on the surface of cement particles is affected by many factors, among which the competitive adsorption of sulfate ions and polycarboxylate superplasticizers seriously affects the adsorption of polycarboxylate superplasticizers on cement—— Di...

Claims

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Application Information

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IPC IPC(8): C08F283/06C08F230/08C08F220/06C04B24/42C04B103/30
CPCC08F283/065C04B24/42C04B2103/302C08F230/08C08F220/06
Inventor 张雄何燕顾明东王义廷洪万领
Owner TONGJI UNIV
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