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Method for functional modification of carbon nanotubes (CNTs) applicable to composite rubber system

A technology of carbon nanotubes and composite rubber, which is applied in the field of material science, can solve problems such as difficult dispersion and uniformity, and achieve the effect of safe and simple raw materials, convenient operation, and improved dispersion

Inactive Publication Date: 2020-05-22
QINGDAO UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, this patent is aimed at the antistatic effect of pressure-sensitive adhesives, and this functional modification method is only suitable for CNTs with a length in the range of 5-10 μm, and it is difficult to disperse evenly for longer CNTs

Method used

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  • Method for functional modification of carbon nanotubes (CNTs) applicable to composite rubber system
  • Method for functional modification of carbon nanotubes (CNTs) applicable to composite rubber system
  • Method for functional modification of carbon nanotubes (CNTs) applicable to composite rubber system

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] The method for functionally modifying CNTs comprises the following steps.

[0032] (1) Disperse 2.0g CNTs in 200ml: 200ml of H 2 o 2 and H 2 O mixed solution. Sonicate for 1 hour in a water bath at 80 °C.

[0033] (2) The above treated CNTs were washed several times with distilled water, and dried in a vacuum oven at 50° C. for 48 hours to obtain hydroxylated CNTs.

[0034] (3) Prepare an AC-FAS ethanol solution with a volume fraction of 1.8%, and mix rapidly within the temperature range of 20°C-25°C. The pH of the solution was then adjusted to 3.5 with glacial acetic acid.

[0035] (4) Add the hydroxylated CNTs prepared in step (2) to the AC-FAS ethanol solution prepared in step (3), configure a mixed solution with a solute mass fraction of 1.7%, and mix and stir magnetically for 2 hours at 40°C. Then the modified CNTs were separated from the supernatant by filtration and washed at least 5 times with ethanol. After washing, they were dried in a vacuum oven at 60...

Embodiment 2

[0037] The method for functionally modifying CNTs comprises the following steps.

[0038] (1) Disperse 2.0g CNTs in 200ml: 200ml of H 2 o 2 and H 2 O mixed solution. Sonicate for 1 hour in a water bath at 80 °C.

[0039] (2) The above treated CNTs were washed several times with distilled water, and dried in a vacuum oven at 60° C. for 48 hours to obtain hydroxylated CNTs.

[0040] (3) Prepare an AC-FAS ethanol solution with a volume fraction of 3.2%, and mix rapidly within the temperature range of 20°C-25°C. The pH of the solution was then adjusted to 3.5 with glacial acetic acid.

[0041] (4) Add the hydroxylated CNTs prepared in step (2) to the AC-FAS ethanol solution prepared in step (3), configure a mixed solution with a solute mass fraction of 1.7%, and mix and stir magnetically for 2 hours at 40°C. Then the modified CNTs were separated from the supernatant by filtration and washed at least 5 times with ethanol. After washing, they were dried in a vacuum oven at 60...

Embodiment 3

[0043] The method for functionally modifying CNTs comprises the following steps.

[0044] (1) Disperse 2.0g CNTs in 200ml: 200ml of H 2 o 2 and H 2 O mixed solution. Sonicate for 1 hour in a water bath at 80 °C.

[0045] (2) The above treated CNTs were washed several times with distilled water, and dried in a vacuum oven at 60° C. for 48 hours to obtain hydroxylated CNTs.

[0046] (3) Prepare an AC-FAS ethanol solution with a volume fraction of 4.7%, and mix rapidly within the temperature range of 20°C-25°C. The pH of the solution was then adjusted to 3.5 with glacial acetic acid.

[0047] (4) Add the hydroxylated CNTs prepared in step (2) to the AC-FAS ethanol solution prepared in step (3), configure a mixed solution with a solute mass fraction of 1.7%, and mix and stir magnetically for 2 hours at 40°C. Then the modified CNTs were separated from the supernatant by filtration and washed at least 5 times with ethanol. After washing, they were dried in a vacuum oven at 50...

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Abstract

The invention provides a method for functional modification of CNTs applicable to a composite rubber system. The method comprises the following steps: treating CNTs by using a covalent bond modification method, i.e., a hydrogen peroxide (H2O2) oxidation method so as to form hydroxyl functional groups on the surfaces of CNTs through oxidation; and then subjecting a silane coupling agent, i.e., (heptadecafluoro-1,1,2,2-tetradecyl)trimethoxysilane (CF3(CF2)7CH2CH2Si(OC2H5)3) (AC-FAS) and the hydroxyl groups on the surface of the CNTs to a dehydration condensation reaction so as to successfully introduce the silane coupling agent to the surfaces of the CNTs. A contact angle test result shows that the surfaces of the CNTs functionalized by the method are changed from hydrophilicity to hydrophobicity, so the compatibility of the CNTs with a rubber matrix is effectively improved. A carbon black / carbon nanotube composite rubber material prepared from 5 phr of the functionalized carbon nanotubes has excellent mechanical properties, and the heat-conducting property of the carbon black / carbon nanotube composite rubber material can be improved by 11.9%. The dispersibility of the CNTs and the compatibility between the CNTs and the matrix are well improved; the dispersion of the CNTs effectively promotes the dispersion of the carbon black; and the two fillers, namely the CNTs and the carbonblack, construct a good filler network in the rubber matrix. The functional modification method provided by the invention effectively solves problems in application of the carbon nanotubes to rubber.

Description

technical field [0001] The invention belongs to the field of material science, and in particular relates to a carbon nanotube (CNTs) functional modification method suitable for a composite rubber system. Background technique [0002] CNTs are seamless nanoscale tubular shell structures formed by curling single or multilayer graphite sheets. Its unique structure and excellent mechanical properties, thermal conductivity, and electrical conductivity make it an important filler. As one of the allotropes of carbon materials, CNTs have been demonstrated as effective materials for improving the thermal conductivity of polymers due to their high aspect ratio and good intrinsic thermal conductivity. People are increasingly interested in applying CNTs in many different fields, but CNTs are easy to agglomerate and difficult to disperse, which limits the application of CNTs. Compared with the high performance of CNTs itself, the performance of CNTs / polymer composites is far lower than...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08K9/06C08K9/02C08K3/04C08L7/00C08L91/06C08K13/06C08K5/09C08K3/22C09C1/44C09C3/06C09C3/12
CPCC08K9/06C08K9/02C08K3/041C08L7/00C09C1/44C09C3/06C09C3/12C09C3/006C08K2201/011C08K2003/2296C08L91/06C08K13/06C08K3/04C08K5/09C08K3/22
Inventor 宋君萍王一雯李锡腾马连湘王泽鹏
Owner QINGDAO UNIV OF SCI & TECH
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