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Amidated graphene oxide modified polycarboxylate superplasticizer and preparation method thereof

A technology of graphene modification and polycarboxylic acid, which is applied in the field of material chemical industry, can solve the problems that graphene oxide is easy to agglomerate and affect the performance of concrete, and achieve stable product performance, good water reducing effect and high water reducing rate.

Active Publication Date: 2017-03-15
WUHAN HAIJIAN ENVIRONMENTAL PROTECTION MATERIALS CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] Graphene oxide is a two-dimensional nano-sheet structure, which itself has an ultra-high elastic modulus, and its application in concrete can improve the performance of concrete, but graphene oxide is easy to agglomerate
This is because graphene oxide is a two-dimensional nanomaterial. Due to the size effect, there is a strong van der Waals force between the sheet structures. Therefore, after a period of time in concrete, the nanosheets will agglomerate and affect the concrete. performance

Method used

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  • Amidated graphene oxide modified polycarboxylate superplasticizer and preparation method thereof
  • Amidated graphene oxide modified polycarboxylate superplasticizer and preparation method thereof
  • Amidated graphene oxide modified polycarboxylate superplasticizer and preparation method thereof

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Effect test

Embodiment 1

[0036] An amidated graphene oxide modified polycarboxylate water reducer, its raw material components are as follows by mass fraction: graphene oxide 0.141% (0.1g), methallyl polyoxyethylene ether 16.908% (12g) , Acrylic acid 1.014% (1.08g), maleic anhydride 1.036% (0.735g), allylamine 0.201% (0.1425g), water 80.306% (57.305g), oxidant 0.268% (0.19g), reducing agent 0.059% (0.042g), EDC hydrochloride 0.006% (0.0045g), NHS 0.004% (0.003g).

[0037] The preparation method of above-mentioned amidated graphene oxide modified polycarboxylate water reducer, concrete steps are as follows:

[0038] (1) Weigh 4.5mg of EDC.HCL into a 25ml beaker, add 5ml of water to it and stir thoroughly, then add 3mg of NHS to the mixed solution, stir thoroughly and ultrasonically for 10 minutes to obtain carboxyl activation solution;

[0039] (2) Take 34.48g mass fraction of 0.29% graphene oxide aqueous solution in the reactor, add the obtained carboxyl activation solution in step (1) while stirring...

Embodiment 2

[0044] A kind of amidated graphene oxide modified polycarboxylate water reducer, its raw material components are as follows by mass fraction: graphene oxide 0.181% (0.2g), methallyl polyoxyethylene ether 10.861% (12g) , Acrylic acid 0.652% (0.72g), maleic anhydride 0.665% (0.735g), allylamine 0.129% (0.1425g), water 87.275% (96.425g), oxidant 0.172% (0.19g), reducing agent 0.038% (0.042g), EDC hydrochloride 0.016% (0.018g), NHS 0.011% (0.012g).

[0045] The preparation method of above-mentioned amidated graphene oxide modified polycarboxylate water reducer, concrete steps are as follows:

[0046] (1) Weigh 18mgEDC.HCL and put it into a 25ml beaker, add 20ml of water to it and stir thoroughly, then add 12mgNHS to the mixed solution, stir well and ultrasonicate for 10 minutes to obtain carboxyl activation solution;

[0047] (2) Take 68.96g mass fraction of 0.29% graphene oxide aqueous solution in the reactor, add the obtained carboxyl activation solution in step (1) while stirr...

Embodiment 3

[0052] An amidated graphene oxide modified polycarboxylate water reducer, its raw material components are as follows by mass fraction: graphene oxide 0.142% (0.1g), methallyl polyoxyethylene ether 16.991% (12g) , Acrylic acid 1.019% (0.72g), maleic anhydride 0.694% (0.49g), allylamine 0.404% (0.1425g), water 80.411% (56.79g), oxidizing agent 0.269% (0.19g), reducing agent 0.059% (0.042g), EDC hydrochloride 0.006% (0.0045g), NHS 0.004% (0.003g).

[0053] The preparation method of above-mentioned amidated graphene oxide modified polycarboxylate water reducer, concrete steps are as follows:

[0054] (1) Weigh 4.5mg of EDC.HCL and put it in a 25ml beaker, add 20ml of water to it and stir thoroughly, then add 3mg of NHS to the mixed solution, stir thoroughly and ultrasonically for 10 minutes to obtain carboxyl activation solution;

[0055] (2) Take 34.48g mass fraction of 0.29% graphene oxide aqueous solution in the reactor, add the obtained carboxyl activation solution in step (1...

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Abstract

The invention discloses an amidated graphene oxide modified polycarboxylate superplasticizer. The main raw materials include: graphene oxide, methylallyl polyoxyethylene ether, acrylic acid, allyl amine, maleic anhydride, water, an oxidizing agent, a reducing agent, a condensation agent and an activating agent. The main method includes: firstly subjecting allyl amine and graphene oxide to amidation reaction to prepare allyl amine modified graphene oxide, then mixing the obtained allyl amine modified graphene oxide with methylallyl polyoxyethylene ether, acrylic acid and maleic anhydride, carrying out polymerization reaction under the initiation of the oxidizing agent and reducing agent, thus obtaining the amidated graphene oxide modified polycarboxylate superplasticizer. The method provided by the invention mainly utilizes the amidation reaction of allyl amine and graphene oxide to realize close combination of a graphene oxide two-dimensional nano lamellar structure with polycarboxylate superplasticizer molecules, so that graphene oxide can be better dispersed during application in concrete, and the synthesized superplasticizer product has more stable performance.

Description

technical field [0001] The invention relates to an amidated graphene oxide modified polycarboxylate water reducer and a preparation method thereof, belonging to the field of material chemical industry. Background technique [0002] Water reducing agent is a high molecular polymer used in cementitious materials such as concrete, which can be prepared by polymerization of various monomers. Because it contains a lot of active groups, it can improve the working performance of concrete and get more compact concrete with better mechanical properties. After several generations of superplasticizers, polycarboxylate superplasticizers have replaced naphthalene superplasticizers and become the most widely used product in concrete. [0003] Graphene oxide is a two-dimensional nanosheet structure, which itself has an ultra-high elastic modulus, and its application in concrete can improve the performance of concrete, but graphene oxide is easy to agglomerate. This is because graphene ox...

Claims

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Application Information

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IPC IPC(8): C08F283/06C08F220/06C08F226/02C08F222/06C08F2/44C08F4/40C04B24/26C04B103/30
CPCC04B24/405C04B2103/302C08F2/44C08F4/40C08F283/065C08F220/06C08F222/06
Inventor 查剑平彭波张芳廖晓民付天全周帆查茜陈亚兵
Owner WUHAN HAIJIAN ENVIRONMENTAL PROTECTION MATERIALS CO LTD
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