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Polycarboxylate water reducing agent with high water reducing rate and low slump loss as well as preparation method thereof

A polycarboxylic acid-based, slump-preserving technology, applied in the field of cement dispersants, can solve the problems of unsuitability for industrial scale production, unsatisfactory product performance, complex monomer composition, etc. The effect of short cycle and simple preparation process

Active Publication Date: 2012-12-26
江苏超力建材科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The disadvantage is that the monomer composition is complex and not suitable for industrial scale production
[0007] To sum up, the previous inventions either had unsatisfactory product performance, or the process was too complicated

Method used

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  • Polycarboxylate water reducing agent with high water reducing rate and low slump loss as well as preparation method thereof
  • Polycarboxylate water reducing agent with high water reducing rate and low slump loss as well as preparation method thereof
  • Polycarboxylate water reducing agent with high water reducing rate and low slump loss as well as preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] 1. The composition and ratio of the monomers used are as follows:

[0035] 1) Monomer A: methallyl polyoxyethylene ether (TPEG), its structural formula is as follows

[0036]

[0037] In the structural formula, m=30, monomer A accounts for 58% of the total monomer weight;

[0038] 2) Monomer B: maleic anhydride, accounting for 14% of the total monomer weight;

[0039] 3) Monomer C: citrate methacrylate, accounting for 18% of the total weight of the monomer, and its structural formula is as follows:

[0040]

[0041] 4) Monomer D: methyl acrylate, accounting for 10% of the total weight of the monomer;

[0042] Two, the preparation process is as follows:

[0043] 1) Add monomer A, monomer B and monomer C into the reaction kettle according to the ratio, and then add deionized water to prepare an aqueous solution, and control the solubility of the monomer mixed aqueous solution at 20%;

[0044] 2) Purge the reactor with nitrogen gas while stirring ...

Embodiment 2

[0047] 1. The composition and ratio of the monomers used are as follows:

[0048] 1) Monomer A: methallyl polyoxyethylene ether (TPEG), its structural formula is as follows

[0049]

[0050] In the structural formula, m=40, monomer A accounts for 75% of the total monomer weight;

[0051] 2) Monomer B: maleic anhydride, accounting for 10% of the total weight of the monomer;

[0052] 3) Monomer C: citrate methacrylate, accounting for 5% of the total weight of the monomer, its structural formula is as follows:

[0053]

[0054] 4) Monomer D: methyl acrylate, accounting for 15% of the total weight of the monomer;

[0055] Two, the preparation process is as follows:

[0056] 1) Add monomer A, monomer B and monomer C into the reaction kettle according to the proportion, then add deionized water to prepare an aqueous solution, and control the solubility of the monomer mixed aqueous solution at 40%;

[0057] 2) Purge the reactor with nitrogen while stirring t...

Embodiment 3

[0060] 1. The composition and ratio of the monomers used are as follows:

[0061] 1) Monomer A: methallyl polyoxyethylene ether (TPEG), its structural formula is as follows

[0062]

[0063] In the structural formula, m=60, monomer A accounts for 92% of the total monomer weight;

[0064] 2) Monomer B: maleic anhydride, accounting for 3% of the total monomer weight;

[0065] 3) Monomer C: citrate methacrylate, accounting for 2% of the total weight of the monomer, its structural formula is as follows:

[0066]

[0067] 4) Monomer D: methyl acrylate, accounting for 3% of the total weight of the monomer;

[0068] Two, the preparation process is as follows:

[0069] 1) Add monomer A, monomer B and monomer C into the reaction kettle according to the proportion, then add deionized water to make an aqueous solution, and control the solubility of the monomer mixed aqueous solution at 40%;

[0070] 2) Purge the reactor with nitrogen gas while stirring and raising...

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Abstract

The invention relates to a polycarboxylate water reducing agent with high water reducing rate and low slump loss as well as a preparation method of the polycarboxylate water reducing agent. The polycarboxylate water reducing agent is prepared by copolymerizing 58-92% of monomer A, 3-16% of maleic anhydride, 2-22% of methacrylic acid citrate and 2-15% of monomer D. The polycarboxylate water reducing agent can endow cement with higher dispersity and lower slump loss under lower accretion, has better cement adaptability, and can effectively inhibit slump loss of concrete and remarkably enhance concrete strength. The invention further discloses the preparation method of the water reducing agent. The preparation method has the advantages of simplicity and convenience, easiness in operation, short production cycle, no pollution in a production process and the like.

Description

technical field [0001] The invention relates to a cement dispersant, in particular to a polycarboxylate water reducer with high water reducing rate and good slump retention and a preparation method thereof. Background technique [0002] With the continuous development of concrete technology, high performance concrete is widely used in engineering construction. High-efficiency water-reducing agent is an indispensable component for preparing high-performance concrete. It has outstanding advantages such as water-reducing reinforcement, improving concrete fluidity and durability. Naphthalene-based, melamine-based and aliphatic traditional high-efficiency water-reducing agents are relatively low in cost, but due to their insufficient water-reducing rate, the loss of concrete slump is serious, and environmentally harmful substances such as formaldehyde are used in the production process. The reason limits its application in high performance concrete. Polycarboxylate superplastic...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B24/26C08F290/06C04B103/30
Inventor 孙振平杨辉水亮亮
Owner 江苏超力建材科技有限公司
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