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A kind of retarder for concrete and preparation method thereof

A retarder and concrete technology, applied in the field of coagulant and its preparation, can solve the problems of poor retarder effect, restrain the application range of concrete retarder, etc., and achieve the effect of good workability

Active Publication Date: 2021-06-15
江苏博拓新型建筑材料股份有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] However, most of the existing concrete retarders can only be used at normal temperature, and in hot summer, the retarding effect is very poor, which limits the application range of concrete retarders to a certain extent.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] The raw materials in this example include the following components in parts by weight: 6 parts of acrylic acid, 5 parts of ethylenediamine, 6 parts of dehydrating agent, 12 parts of polymer intermediate, 0.05 part of initiator, 0.01 part of reducing agent, chain transfer agent 0.02 parts, 7 parts of methacrylate, 6 parts of propylene alcohol, 3 parts of sucrose.

[0025] Wherein, the dehydrating agent is benzene, the initiator is hydrogen peroxide solution with a mass fraction of 30%, the reducing agent is thioglycolic acid, and the chain transfer agent is ascorbic acid.

[0026] The preparation method step of this retarder for concrete is as follows:

[0027] (1) Acrylic acid and ethylenediamine are azeotropically distilled at 90°C, benzene is added during the reaction, and the produced water is continuously removed as a dehydrating agent to obtain a polymer intermediate;

[0028] (2) At 40°C, the polymer intermediate was reacted with methacrylate and propylene alcoho...

Embodiment 2

[0031] The raw materials in this example include the following components in parts by weight: 6 parts of acrylic acid, 6 parts of ethylenediamine, 5 parts of dehydrating agent, 10 parts of polymer intermediate, 0.06 part of initiator, 0.02 part of reducing agent, chain transfer agent 0.03 parts, 7 parts of methacrylate, 5 parts of propylene alcohol, 3 parts of sucrose.

[0032] Wherein, the dehydrating agent is toluene, the initiator is hydrogen peroxide solution with a mass fraction of 30%, the reducing agent is mercaptopropionic acid, and the chain transfer agent is ascorbic acid.

[0033] The preparation method step of this retarder for concrete is as follows:

[0034] (1) Acrylic acid and ethylenediamine are azeotropically distilled at 95°C, and toluene is added during the reaction to continuously remove the produced water as a dehydrating agent to obtain a polymer intermediate;

[0035] (2) At 45°C, the polymer intermediate was reacted with methacrylate and propylene alc...

Embodiment 3

[0038] The raw materials in this example include the following components in parts by weight: 6 parts of acrylic acid, 8 parts of ethylenediamine, 8 parts of dehydrating agent, 10 parts of polymer intermediate, 0.06 part of initiator, 0.02 part of reducing agent, chain transfer agent 0.03 parts, 7 parts of methacrylate, 5 parts of propylene alcohol, 3 parts of sucrose.

[0039] Wherein, the dehydrating agent is benzene, the initiator is hydrogen peroxide solution with a mass fraction of 30%, the reducing agent is thioglycolic acid, and the chain transfer agent is ascorbic acid.

[0040] The preparation method step of this retarder for concrete is as follows:

[0041] (1) Acrylic acid and ethylenediamine are azeotropically distilled at 93°C, benzene is added during the reaction, and the produced water is continuously removed as a dehydrating agent to obtain a polymer intermediate;

[0042] (2) At 50°C, react the polymer intermediate with methacrylate and propylene alcohol for ...

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PUM

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Abstract

The invention discloses a retarder for concrete and a preparation method thereof. The raw materials include the following components in parts by weight: 2-6 parts of acrylic acid, 4-12 parts of ethylenediamine, 3-9 parts of dehydrating agent, polymer 6-18 parts of intermediates, 0.05-0.08 parts of initiators, 0.01-0.03 parts of reducing agents, 0.02-0.04 parts of chain transfer agents, 4-8 parts of methacrylates, 5-12 parts of propenyl alcohol, 2-7 parts of sucrose . The present invention uses acrylic acid and organic amines to carry out condensation acylation reaction to generate active polymer molecules containing multiple hydrophilic groups such as amino groups and hydroxyl groups. The polymer molecules can be further reacted with methacrylate and propylene alcohol to form the main chain- A macromolecular structure retarder with a suitable side chain can coat the cement and hinder the hydration reaction.

Description

technical field [0001] The invention relates to a coagulant and a preparation method thereof, in particular to a concrete retarder and a preparation method thereof. Background technique [0002] With the continuous development of construction technology, concrete with various special requirements emerges as the times require. In some large-scale concrete projects, in order to ensure that the bored piles in the subsequent construction and the bored piles completed in the previous construction are interlocked into a whole, it is often required to extend the setting time of the concrete to 60-80 hours, but it cannot affect the concrete. ultimate strength. Obviously, ordinary retarders cannot meet this requirement. The market share of this kind of ultra-retarding concrete is gradually increasing. In today's shrinking civil construction market, research on concrete super-retarding agents has very realistic economic and technical values. [0003] At present, the retarders on th...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B24/24C04B103/22
CPCC04B40/0039C04B2103/22C04B24/04C04B24/121C04B24/045C04B24/026C04B24/10C04B24/00C04B24/16C04B22/068C04B2103/0068C04B24/24
Inventor 夏小雯顾红霞朱宝贵蔡星陈迪
Owner 江苏博拓新型建筑材料股份有限公司
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