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Dopamine modified carbon nanotube/rubber composite material and preparation method thereof

A carbon nanotube and composite material technology, which is applied in the direction of fibrous fillers, dyed low molecular organic compounds, etc. To achieve uniform dispersion of carbon nanotubes and other issues, to achieve the effect of improving thermal conductivity

Active Publication Date: 2012-01-18
BEIJING UNIV OF CHEM TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

While changing the chemical inertness and entanglement of carbon nanotubes, this method also greatly destroys the structure of carbon nanotubes, which inevitably reduces the performance of carbon nanotubes themselves, thus affecting the carbon nanotubes. Reinforcement or functionalization effect on the matrix material; the traditional mechanical blending method is still the main method for preparing carbon nanotubes / rubber composites, but this method is difficult to effectively achieve uniform dispersion of carbon nanotubes in the matrix

Method used

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  • Dopamine modified carbon nanotube/rubber composite material and preparation method thereof
  • Dopamine modified carbon nanotube/rubber composite material and preparation method thereof
  • Dopamine modified carbon nanotube/rubber composite material and preparation method thereof

Examples

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Effect test

Embodiment 1

[0026] Take 1 part of original carbon nanotubes (CNTs) and preliminarily disperse them in 250 parts of deionized water by means of ultrasonic vibration, add 0.121 parts of trishydroxymethylaminomethane, and use a mass fraction of 10% dilute hydrochloric acid solution to adjust the pH of the carbon nanotube suspension to Adjust the value to 7, add 1 part of dopamine, deposit and react at room temperature for 8 hours, then wash, filter, and dry to obtain dopamine-modified carbon nanotubes (CNTs-PDA);

[0027] The modified carbon nanotubes were dispersed in 250 parts of deionized water, and oscillated for 1 hour using an ultrasonic cell pulverizer (GA 98-III type) to form a uniform and stable carbon nanotube-deionized water suspension. Then the suspension was added dropwise into 170 parts of natural rubber latex, mechanically stirred for 2 hours, and deionized water was added to determine the solid content of the mixed solution to be 8%. The carbon nanotube-natural rubber latex m...

Embodiment 2

[0031] Take 2 parts of original carbon nanotubes (CNTs) and preliminarily disperse them in 500 parts of deionized water by means of ultrasonic vibration, add 0.121 parts of tris-hydroxymethylaminomethane, and adjust the pH of the suspension of carbon nanotubes with 10% dilute hydrochloric acid solution Adjust the value to 7.5, add 2 parts of dopamine, deposit and react at room temperature for 12 hours, then wash, filter, and dry to obtain carbon nanotubes (CNTs-PDA) after dopamine modification;

[0032] The modified carbon nanotubes were dispersed in 500 parts of deionized water, and oscillated for 1 hour using an ultrasonic cell pulverizer (GA 98-III type) to form a uniform and stable carbon nanotube-deionized water suspension. Then the suspension was added dropwise into 170 parts of natural rubber latex, mechanically stirred for 0.5 hour, and deionized water was added to determine the solid content of the mixed solution as 10%. Add the carbon nanotube-natural rubber latex mi...

Embodiment 3

[0036] Take 5 parts of original carbon nanotubes and disperse them in 1500 parts of deionized water by ultrasonic vibration, add 1.21 parts of trishydroxymethylaminomethane, and adjust the pH value of the carbon nanotube suspension to 8.5 with a mass fraction of 10% dilute hydrochloric acid solution , add 2.5 parts of dopamine powder, deposit and react at room temperature for 24 hours, then wash and filter until the filtrate is colorless and transparent, and dry at 60°C to obtain dopamine-modified carbon nanotubes;

[0037] The modified carbon nanotubes were dispersed in 900 parts of deionized water, and ultrasonically oscillated for 0.5 hours to form a uniform and stable suspension of carbon nanotubes. Then the suspension was added dropwise into 170 g of natural rubber latex, mechanically stirred for 2 hours, and deionized water was added to determine the solid content of the mixed solution as 20%. Add the carbon nanotube-natural rubber latex mixture dropwise to a high-speed ...

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Abstract

The invention discloses a dopamine modified carbon nanotube / rubber composite material and a preparation method thereof, and belongs to the technical field of rubber nano composite materials. The carbon nanotubes of which surfaces are modified by dopamine are uniformly dispersed into a rubber material. The preparation method comprises the following steps of: dispersing original carbon nanotubes into deionized water to keep pH value stably within a range of 5-8; adding the dopamine to sediment and polymerize at room temperature so as to obtain the carbon nanotubes with dopamine modified surfaces; adding modified carbon nanotubes into the deionized water to form carbon nanotube-deionized water suspension; and dropwise adding the suspension into latex, continuously mechanically stirring to obtain carbon nanotube-latex mixed solution, and dropwise adding into a demulsifier to perform flocculation, breaking and drying so as to obtain the carbon nanotube / rubber composite material in a masterbatch state. By adopting the conventional mechanical blending method, an auxiliary agent is added into the master batch. The tensile strength, the stress at definite elongation and the thermal conductivity of the composite material are correspondingly improved.

Description

technical field [0001] The invention belongs to the technical field of rubber nanocomposite materials, in particular to a preparation method for reinforcing rubber with dopamine-modified carbon nanotubes. technical background [0002] Since the discovery by Japanese electron microscope scientist Iijima, carbon nanotubes (CNTs) have attracted great attention due to their unique structure and excellent performance, and have been used in the preparation of nanoelectronic devices, catalyst carriers, electromagnetic shielding materials, antistatic materials, Different fields such as energy storage materials show promising application prospects. As a polymer material with high elasticity at room temperature, rubber has many properties (including tensile strength, hardness, wear resistance, fatigue resistance, etc.) that cannot meet the application requirements without reinforcement. Enhanced phase is added to improve its performance. The size of carbon nanotubes is on the order ...

Claims

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Application Information

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IPC IPC(8): C08L7/02C08L9/08C08L9/04C08K9/04C08K7/06C08K3/04C09C1/44C09C3/08
Inventor 卢咏来许图远王文才张立群
Owner BEIJING UNIV OF CHEM TECH
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