Modified multi-walled carbon nanotube modified cement-based composite material and preparation method thereof

A technology of multi-wall carbon nanotubes and composite materials, which is applied in the field of modified multi-wall carbon nanotube modified cement-based composite materials and the preparation thereof, can solve the problems of inactive functional groups, difficult to disperse uniformly, restricted dispersion, etc. The method is simple, the raw materials are easy to obtain, and the effect of improving the compressive strength

Inactive Publication Date: 2021-03-19
GUILIN UNIVERSITY OF TECHNOLOGY +1
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] However, multi-walled carbon nanotubes themselves have strong van der Waals forces, are easy to entangle and agglomerate together, and have no active functional groups on the surface, which makes it difficult to disperse uniformly in water, thereby also restricting the dispersion in cement matrix; it is necessary to obtain a good Enhancement effect, the dispersion of multi-walled carbon nanotubes has a crucial influence

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  • Modified multi-walled carbon nanotube modified cement-based composite material and preparation method thereof
  • Modified multi-walled carbon nanotube modified cement-based composite material and preparation method thereof

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preparation example Construction

[0031] The preparation method of the modified multi-walled carbon nanotubes is:

[0032] (a) Weigh 1.0 g of multi-walled carbon nanotubes with an aspect ratio of 1800 and a length of 6 μm, place them in 400 mL of 4 mol / L sodium hydroxide solution for ultrasonic dispersion for 25 min, and add 1.5 g of sodium persulfate, mechanically stirred for 6 hours, left to stand and poured off the supernatant, the solids in the lower layer were washed with absolute ethanol and deionized water, and the obtained solids were dried at 80°C to obtain hydroxyl-modified polysaccharides. Walled carbon nanotubes;

[0033] (b) Add the hydroxyl-modified multi-walled carbon nanotubes of step (a) to a 0.8 g / L lauryl polyoxyethylene ether solution, and slowly add 0.3 g of polyamide-amine dendrimers while heating to 50° C. Shaped polymer, reflux reaction for 4h, the solution is stirred and ultrasonic treatment is applied during the reaction process;

[0034] (c) After the reaction, the reaction solutio...

Embodiment 1

[0038]A modified multi-walled carbon nanotube modified cement-based composite material, comprising 24 parts of cement, 60 parts of river sand, 15 parts of silica lime, 5 parts of reinforcing fibers, and 3 parts of modified multi-walled carbon nanotubes in parts by weight , 0.5 parts of polycarboxylate water reducer, 1 part of defoamer, 10 parts of water. The reinforcing fibers are steel fibers, and the aspect ratio of the reinforcing fibers is 25:1. The polycarboxylate water reducer has a solid content of 25% and a water reducing rate of 35%. The defoamer is a silicone defoamer.

[0039] The preparation method of described cement-based composite material, comprises the steps:

[0040] (1) Add the modified multi-walled carbon nanotubes to 3 parts of water under the conditions of stirring and ultrasonic treatment, and finally obtain the modified multi-walled carbon nanotubes that can be uniformly and stably dispersed in water, and then add polycarboxylate-based reducing Water...

Embodiment 2

[0045] A modified multi-walled carbon nanotube modified cement-based composite material, comprising 30 parts of cement, 90 parts of river sand, 30 parts of silica lime, 10 parts of reinforcing fibers, and 5 parts of modified multi-walled carbon nanotubes in parts by weight , 1.5 parts of polycarboxylate water reducer, 2 parts of defoamer, 15 parts of water. The reinforcing fiber is glass fiber, and the aspect ratio of the reinforcing fiber is 40:1. The polycarboxylate water reducer has a solid content of 45% and a water reducing rate of 50%. The defoamer is a silicone defoamer.

[0046] The preparation method of described cement-based composite material, comprises the steps:

[0047] (1) Add the modified multi-walled carbon nanotubes to 3 parts of water under the conditions of stirring and ultrasonic treatment, and finally obtain the modified multi-walled carbon nanotubes that can be uniformly and stably dispersed in water, and then add polycarboxylate-based reducing Water ...

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Abstract

The invention provides a modified multi-walled carbon nanotube modified cement-based composite material, which comprises the following components by weight: 24-30 parts of cement, 60-90 parts of riversand, 15-30 parts of siliceous lime, 5-10 parts of reinforced fiber, 3-5 parts of modified multi-walled carbon nanotubes, 0.5-1.5 parts of a polycarboxylate-type water reducing agent, 1-2 parts of adefoaming agent and 10-15 parts of water. According to the preparation method, hydroxyl and polyamide-amine dendritic polymers are adopted for jointly modifying the multi-walled carbon nanotubes for the first time, so that the properties such as compressive strength and breaking strength can be remarkably improved; the reinforced fibers are uniformly dispersed in the slurry structure so as to be firmly combined with a cement-based material, so that the crack resistance and the excellent impact resistance of the cement-based composite material are improved.

Description

technical field [0001] The invention belongs to the technical field of building materials, and in particular relates to a modified multi-walled carbon nanotube modified cement-based composite material and a preparation method thereof. Background technique [0002] With the continuous advancement of material science theory and nanotechnology, cement-based composite materials are developing in the direction of high-strength, high-performance structural materials. The existing technology uses conductive materials such as carbon fiber, nano-carbon black, carbon nanotubes and graphene as Cement-based filling and adding components to improve the performance of cement-based composites, so that the cement-based composites have the characteristics of multifunctional and smart materials. In recent years, multi-walled carbon nanotube-reinforced cement-based materials have become a research hotspot in the industry. [0003] Chinese patent CN110407536A discloses an impact-resistant carb...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B28/04C04B28/06C04B20/02C04B14/02C04B111/20
CPCC04B28/04C04B28/06C04B28/065C04B20/023C04B14/026C04B2201/50C04B2201/52C04B2111/2038C04B14/068C04B14/043C04B14/48C04B2103/302C04B24/42C04B14/42C04B24/003
Inventor 李玲明阳陈平胡成李青甘国兴潘格林
Owner GUILIN UNIVERSITY OF TECHNOLOGY
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