Multi-orientation carbon nanotube composite film and preparation method thereof
A carbon nanotube composite, carbon nanotube technology, applied in chemical instruments and methods, lamination, lamination auxiliary operations, etc., can solve the problems of low unevenness and high electromagnetic shielding efficiency, and achieves weakening anisotropy, increasing Overall shielding effectiveness, the effect of improving the overall conductivity
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[0044] The second aspect of the present application provides a method for preparing a composite film of multi-oriented carbon nanotubes, comprising the following steps:
[0045] S1: Obtain the carbon nanotube alignment film;
[0046] S2: Laminating two or more aligned carbon nanotube films, and forming an included angle θ between the orientation intersections between two layers of aligned carbon nanotube films that are stacked adjacently;
[0047] S3: Densifying the aligned carbon nanotube film stacked in S2 to obtain a composite film of multi-oriented carbon nanotubes.
[0048] In an embodiment of the present application, the stacking angle θ between the aligned carbon nanotubes is a cross-stacking combination of 0°+90°+0°+90°+....
[0049] In another embodiment of the present application, such as Figure 4 As shown, the stacking angle θ between the carbon nanotube oriented films is a combination of 0°+45°+45°+45°....
[0050] In another embodiment of the present applicati...
Embodiment 1
[0065] Carbon nanotube arrays were prepared by chemical vapor deposition, and carbon nanotube single films were pulled out in parallel from the carbon nanotube arrays, and stacked and densely formed into carbon nanotube aligned films. The thickness of each carbon nanotube aligned film was 6um, and 12 sheets were obtained for preparation For a good carbon nanotube oriented film, θ is selected to be 30°, and 12 sheets of carbon nanotube oriented films are laminated in a clockwise direction. The angle between each two layers of carbon nanotube oriented films is 30°. Dry and compact to obtain multi-oriented carbon nanotube composite film.
[0066] Taking the axial direction of the first carbon nanotube oriented film as the X direction, and the axial direction perpendicular to the carbon nanotube oriented film as the Y direction, the multi-oriented carbon nanotube composite film prepared in this embodiment is measured by the waveguide method. 12.5GHz electromagnetic wave shielding ...
Embodiment 2
[0068] Carbon nanotube arrays were prepared by chemical vapor deposition, and carbon nanotube single films were pulled out in parallel from the carbon nanotube arrays, and stacked and densely formed into carbon nanotube aligned films. The thickness of each carbon nanotube aligned film was 6um, and 12 sheets were obtained for preparation For a good carbon nanotube oriented film, θ is chosen to be 45°, such as Figure 4 As shown, 12 sheets of carbon nanotube oriented films are laminated in a clockwise direction, and the angle between each two layers of carbon nanotube oriented films is 45°. After bonding with conductive paste, they are dried and compacted to obtain multi-oriented carbon nanotube composites. membrane.
[0069] Taking the axial direction of the first carbon nanotube oriented film as the X direction, and the axial direction perpendicular to the carbon nanotube oriented film as the Y direction, the multi-oriented carbon nanotube composite film prepared in this embod...
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