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A mud-resistant and slump-preserving water reducer and its preparation method

A slump-preserving, water-reducing agent technology, applied in the field of concrete admixtures, can solve the problems of large loss of concrete slump over time, easy cracks and cracks, lack of high-quality admixtures, etc., to achieve superior slump-preserving performance, improve Effect of early strength and shortened mold turnaround time

Active Publication Date: 2020-11-03
GUANGDONG REDWALL NEW MATERIALS +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0009] 3. Concrete slump loses a lot over time;
[0010] 4. High water demand and high admixture content;
[0011] 5. Large shrinkage rate, easy to produce cracks and cracks;
[0012] 6. The use of machine-made sand and recycled aggregates from construction solid waste, and the lack of matching high-quality admixtures

Method used

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  • A mud-resistant and slump-preserving water reducer and its preparation method
  • A mud-resistant and slump-preserving water reducer and its preparation method
  • A mud-resistant and slump-preserving water reducer and its preparation method

Examples

Experimental program
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Effect test

Embodiment 1

[0043]An embodiment of the slump-retaining water-reducer of the present invention, the slump-retaining water-reducer described in this embodiment is prepared by the following method:

[0044] In a 500ml four-neck glass flask equipped with a stirrer, a thermometer, and a reflux condenser, add 50wt% PEI aqueous solution, phosphorous acid H 3 PO 3 and 0.3 milliliters of 37wt% concentrated hydrochloric acid (volume accounts for 0.1% of the total reaction system), fully stirred, heated up to 40 ° C, slowly added dropwise 37% formaldehyde solution, and after 2 hours, the dropwise addition was completed, slowly heated up to 80 ° C, and the reaction was continued for 3 Hours, the solution is yellow-brown, lower the temperature to below 40°C, add 40% sodium hydroxide solution, adjust the pH=8-9, and obtain the product sodium polyethyleneimine phosphite.

[0045] Among them, PEI: H 3 PO 3 : The molar ratio of HCHO is 1.0:0.2:0.9.

[0046] The PEI structure of this embodiment is It...

Embodiment 2

[0051] An embodiment of the slump-retaining water-reducer of the present invention, the slump-retaining water-reducer described in this embodiment is prepared by the following method:

[0052] In a 500ml four-neck glass flask equipped with a stirrer, a thermometer, and a reflux condenser, add 50wt% PEI aqueous solution, phosphorous acid H 3 PO 3 and 0.3 milliliters of 37wt% concentrated hydrochloric acid (volume accounts for 0.1% of the total reaction system), fully stirred, heated up to 40 ° C, slowly added dropwise 37% formaldehyde solution, and after 2 hours, the dropwise addition was completed, slowly heated up to 80 ° C, and the reaction was continued for 3 Hours, the solution is yellow-brown, lower the temperature to below 40°C, add 40% sodium hydroxide solution, adjust the pH=8-9, and obtain the product sodium polyethyleneimine phosphite.

[0053] Among them, PEI: H 3 PO 3 : The molar ratio of HCHO is 1.0:0.95:0.9.

[0054] The PEI structure of this embodiment is ...

Embodiment 3

[0059] An embodiment of the slump-retaining water-reducer of the present invention, the slump-retaining water-reducer described in this embodiment is prepared by the following method:

[0060] In a 500ml four-neck glass flask with a stirrer, a thermometer, and a reflux condenser, add 50wt% PEI aqueous solution and phosphorous acid H 3 PO 3 , 0.25 milliliters of 37wt% concentrated hydrochloric acid (volume accounts for 0.08% of the total reaction system), fully stirred, warming up to 45 ° C, slowly dripping 37% formaldehyde solution, 2.5 hours dropwise, slowly heating up to 85 ° C, continue reaction 2 Hours, the solution is yellow-brown, lower the temperature to below 40°C, add 40% sodium hydroxide solution, adjust the pH=8-9, and obtain the product sodium polyethyleneimine phosphite.

[0061] Among them, PEI: H 3 PO 3 : The molar ratio of HCHO is 1.0:1.5:1.3.

[0062] The difference between the PEI structure of this embodiment and embodiment 1 is that the PEI structure of ...

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Abstract

The invention discloses a clay-tolerant slump-loss-resistant water reducer, and a preparation method thereof. The clay-tolerant slump-loss-resistant water reducer is invented based on high molecular structure design principles through Mannich reaction; modification of water soluble polymer polyethyleneimine (PEI) is carried out, introduction of phosphorous acid function groups is realized, and synthesis of the clay-tolerant slump-loss-resistant water reducer with special tolerance on clay and regenerated aggregate is realized. The molecular structure of the clay-tolerant slump-loss-resistant water reducer contains a large amount of positively charged amino groups, the molecular structure shape like a ball, physical crosslinking is adopted in formation of the molecular structure, and chelating adsorption layers are formed on cement particle surfaces, so that excellent dispersity and slump loss resistance are achieved, and problems of commercially available slump loss resistant polycarboxylic acid water reducers such as poor dispersity, low water reducing rate, and poor clay tolerance are solved. The clay-tolerant slump-loss-resistant water reducer can be used alone, or combined withother functional polycarboxylic acid water reducers, and excellent dispersity and slump loss resistance on clay and building solid waste regenerated aggregate concrete are excellent.

Description

technical field [0001] The invention relates to the technical field of concrete admixtures, in particular to a mud-resistant and slump-preserving water reducer and a preparation method thereof. Background technique [0002] Concrete refers to a hardened body that is mixed with water, cement, sand and stone, poured, cured, and hardened. It is widely used in civil engineering and is one of the most important civil engineering materials in contemporary times. Concrete has abundant raw materials and low price. The simple production process is a material full of vitality. [0003] Concrete admixture is a component mixed in concrete. It is the fifth component in concrete raw materials except cement, water, sand and stone. The use of admixture in concrete has been recognized as improving the strength of concrete and improving the strength of concrete. It is an important measure to expand its various performances, save production energy consumption, and protect the environment. Con...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08G73/04C04B24/28C04B103/30
CPCC04B24/243C04B2103/302C08G73/0206
Inventor 张小富白淑英赵利华
Owner GUANGDONG REDWALL NEW MATERIALS