Preparation method and application of modified carbon nanotube

Abstract

The invention discloses a preparation method and an application of a modified carbon nanotube. The preparation method comprises the steps: 1) preparing a surface-carboxylated carbon nanotube; 2) dissolving the surface-carboxylated carbon nanotube in a mixed solution of water and ethanol, then adding tetraethoxysilane, vinyltriethoxysilane and ammonia water, and carrying out a reaction to prepare the modified carbon nanotube with vinyl on the surface. The invention also discloses the application of the prepared modified carbon nanotube in a heat-conducting insulating material. The modified carbon nanotube prepared by the preparation method disclosed by the invention has the advantages of high thermal conductivity, low electric conductivity and good compatibility with organic matters, and isparticularly suitable for heat-conducting insulating paints.

Description

technical field [0001] The invention belongs to the technical field of heat conduction and insulation, and in particular relates to a preparation method of modified carbon nanotubes and an application thereof. Background technique [0002] With the continuous development of motor technology, the power of the motor continues to increase, and the power consumption of the motor also increases at the same time, which leads to higher and higher operating temperatures of the motor, and the heat dissipation capacity of the various components of the motor, especially the insulation, directly affects the temperature of the motor. If the temperature rise of the motor exceeds the limit value, it will cause insulation aging, coil breakdown, and motor burnout. If the insulating varnish has high thermal conductivity and electrical insulation performance at the same time, it can effectively reduce the temperature rise of the motor winding, thereby increasing the temperature. The output for...

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Problems solved by technology

[0003] However, due to the use of polymer materials in most insulating varnishes today, the thermal conductivity is relatively poor. In order to improve the thermal conductivity of insulating varnishes, most researchers use the method of doping high thermal conductivity materials, but these insulating varnishes are in order to obtain high thermal conductivity Generally, high doping is required, and high doping will affect other mechanical properties of insulating varnish, and there are also problems such as poor compatibility between doped particles and insulating varnish

For example, unsaturated polyester resin, due to its simple production process, easy to obtain raw materials, chemical corrosion resistance, excellent mechanical and electrical properties, room temperature curing, good process performance, etc., is used as the largest variety of thermosetting resins. It is widely used in insulating varnishes, but it also has the above problems. In order to improve thermal conductivity, it is difficult to achieve better heat conduction due to uneven dispersion or defects in the thermal conductivity material itself. , due to the incompatibility between the thermally conductive material and the surface of the organic matter further limits its thermal conductivity

[0004] Among them, carbon nanotubes (CNTs) in thermally conductive materials have received extensive attention because of their excellent thermal conductivity, mechanical strength, and electrical conductivity. According to Maxwell's mixing theory, adding 1% of carbon nanotubes can theoretically improve The thermal conductivity of organic matter is 50 times, so it is expected to solve the negative effects of high doping mentioned above, such as high doping reduces the mechanical properties of insulating varnish and other properties; The high electrical conductivity and incompatibility with organic surfaces and interfaces limit the application of carbon nanotubes as thermal conductive materials in insulating materials

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