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Polycarboxylate-type high-water-reducing slump retaining agent and preparation method and application method thereof

A technology of polycarboxylic acid series and slump-retaining agent, which is applied in the field of building material concrete admixture, can solve the problems of prolonged concrete setting time, weak slump-retaining ability of retarder, and reduced concrete quality, and achieves strong operability and low cost. Low, reaction-safe effect

Inactive Publication Date: 2019-06-04
山西科腾环保新材料股份有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The traditional method of adding sugars as retarding ingredients to solve the excessive loss of concrete slump is far from meeting the needs of the project, especially when the transportation distance is long, the problem is particularly prominent, and the addition of retarders cannot Fundamentally solve the shortcomings of weak slump retention ability, too much retarder dosage will prolong the setting time of concrete, reduce the quality of concrete, and affect the construction progress

Method used

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  • Polycarboxylate-type high-water-reducing slump retaining agent and preparation method and application method thereof
  • Polycarboxylate-type high-water-reducing slump retaining agent and preparation method and application method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0044] The present embodiment selects following raw material:

[0045] 170g isobutyl alcohol polyoxyethylene ether, 320g purified water, 1.5g hydrogen peroxide, 10g acrylic acid, 16g hydroxyethyl acrylate, 0.5g vitamin C, 0.8g mercaptopropionic acid, 2.5g sodium hydroxide.

[0046] The steps are:

[0047] (1) Mix 170g isobutenol polyoxyethylene ether with 225g pure water and stir for 30 minutes to completely melt isobutenol polyoxyethylene ether;

[0048] (2) Add 1.5g of hydrogen peroxide into the already stirred monomer and continue to stir for 5 minutes;

[0049] (3) Mix and stir 10g of acrylic acid, 16g of hydroxyethyl acrylate, and 25g of purified water as liquid A;

[0050] (4) Stir 0.5g of vitamin C, 0.8g of mercaptopropionic acid, and 50g of purified water as liquid B;

[0051] (5) Then add liquid A and liquid B to the mixture of isobutyl alcohol polyoxyethylene ether, purified water and hydrogen peroxide at the same time. The time for adding liquid A is 2 hours, and...

Embodiment 2

[0054] The present embodiment selects following raw material:

[0055] 200g isobutylene alcohol polyoxyethylene ether, 345g purified water, 3g hydrogen peroxide, 25g methacrylic acid, 20g hydroxyethyl acrylate, 1g vitamin C, 1.8g mercaptopropionic acid, 4g sodium hydroxide.

[0056] The steps are:

[0057] (1) Mix 200g isobutenol polyoxyethylene ether with 235g pure water and stir for 30 minutes to completely melt isobutenol polyoxyethylene ether;

[0058] (2) Add 3g of hydrogen peroxide into the already stirred monomer and continue to stir for 5 minutes;

[0059] (3) Mix and stir 25g of methacrylic acid, 20g of hydroxyethyl acrylate, and 35g of purified water as liquid A;

[0060] (4) Stir 1g of vitamin C, 1.8g of mercaptopropionic acid, and 55g of purified water as liquid B;

[0061] (5) Then add liquid A and liquid B to the mixture of isobutyl alcohol polyoxyethylene ether, purified water and hydrogen peroxide at the same time. The time for adding liquid A is 2 hours, an...

Embodiment 3

[0064] The present embodiment selects following raw material:

[0065] 175g isobutenol polyoxyethylene ether, 333g purified water, 2.5g hydrogen peroxide, 20g itaconic acid, 18g hydroxyethyl acrylate, 0.8g vitamin C, 1g mercaptopropionic acid, 3g sodium hydroxide.

[0066] The steps are:

[0067] (1) Mix 175g isobutenol polyoxyethylene ether with 230g pure water and stir for 30 minutes to completely melt the isobutenol polyoxyethylene ether;

[0068] (2) Add 2.5g of hydrogen peroxide into the already stirred monomer and continue to stir for 5 minutes;

[0069] (3) Mix and stir 20g of itaconic acid, 18g of hydroxyethyl acrylate, and 30g of purified water as liquid A;

[0070] (4) Stir 0.8g of vitamin C, 1g of mercaptopropionic acid, and 53g of purified water as liquid B;

[0071] (5) Then add liquid A and liquid B to the mixture of isobutyl alcohol polyoxyethylene ether, purified water and hydrogen peroxide at the same time. The time for adding liquid A is 2 hours, and the t...

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Abstract

The invention discloses a polycarboxylate-type high-water-reducing slump retaining agent and a preparation method thereof. The preparation method comprises the following specific steps: (1) mixing andstirring isobutene alcohol polyoxyethylene ether and purified water for 30 min to thoroughly melt polyoxyethylene ether; (2) adding hydrogen peroxide into a well-stirred monomer and continuously stirring for 5 min; (3) mixing and stirring unsaturated acid, hydroxyethyl acrylate and water as a liquid A; (4) stirring vitamin C, mercaptopropionic acid and water as a liquid B; (4) dropwise adding theliquid A and the liquid B into a mixed solution of isobutene alcohol polyoxyethylene ether, purified water and hydrogen peroxide; and (5) carrying out heat insulation for 1 h after the liquid A and the liquid B are dropwise added, then adding sodium hydroxide and water to adjust pH and solid content, and stirring for 20-30 min to prepare the polycarboxylate-type high-water-reducing slump retaining agent. In the application process, the loss problem of concrete in the long-distance transport process is solved and then the operability of concrete is guaranteed. The polycarboxylate-type high-water-reducing slump retaining agent is worthy of promotion and application.

Description

technical field [0001] The invention relates to a polycarboxylic acid-based high water-reducing and slump-retaining agent and a preparation method thereof, belonging to the field of building material concrete admixtures. Background technique [0002] With the development of construction industries such as transportation, hydropower, and municipal administration, the construction of high-span bridges, buildings with hundreds of floors, oil drilling platforms, offshore airports, offshore cities, and submarine tunnels has gradually emerged. Concrete performance, strength indicators, and durability The requirements are getting higher and higher, and almost all require the use of pumped concrete. Pumping concrete requires long-distance transportation and construction under high temperature conditions, which will inevitably cause slump loss of freshly mixed concrete. Regarding the problem of excessive slump loss, admixture workers usually use polycarboxylate water reducers and so...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08F283/06C08F220/20C08F220/06C08F222/02C04B24/26C04B103/30
Inventor 牛引生高彩珍武英袁立志袁博王利勇郭宾
Owner 山西科腾环保新材料股份有限公司