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Ultra-black composite coating and preparation method thereof

A composite coating and ultra-black technology, which is applied in printed circuit manufacturing, identification devices, printed circuit components, etc., can solve the problems of affecting the consistency of reflectivity, producing marks, and easy to drop, so as to avoid the reflection of light on the surface rate inconsistent effect

Pending Publication Date: 2022-08-05
UNILUMIN GRP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, ultra-black materials have high requirements for the surface treatment of PCB substrates, poor adhesion on PCB substrates, and ultra-black materials have low insulation resistance
In addition, due to the need to form a microporous structure on the surface of the ultra-black material to increase the absorption of light, the microporous structure formed on the surface is relatively low in strength, and it is easy to drop or produce marks under touch or slight scratches, affecting Consistency of reflectivity

Method used

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  • Ultra-black composite coating and preparation method thereof
  • Ultra-black composite coating and preparation method thereof
  • Ultra-black composite coating and preparation method thereof

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preparation example Construction

[0043] The invention provides a preparation method of a super black composite coating, comprising the following steps:

[0044] Step S11, see figure 1 , the circuit board 10 is provided.

[0045] In one embodiment, the circuit board 10 includes pads 11 .

[0046] Step S12 , forming a photosensitive resin layer 20 on the circuit board 10 .

[0047] Specifically, a photosensitive resin may be formed on the circuit board 10 by printing or spraying, and the photosensitive resin may be heated to form the photosensitive resin layer 20 . Wherein, the photosensitive resin layer 20 covers the pad 11 .

[0048] In one embodiment, the temperature for heating the photosensitive resin may be 65° C.˜80° C., and the time for heating the photosensitive resin may be 25˜40 minutes.

[0049] In one embodiment, the thickness of the photosensitive resin layer 20 may be 10˜30 μm.

[0050] In one embodiment, the material of the photosensitive resin layer 20 may be epoxy resin.

[0051] Step S1...

Embodiment 1

[0101] The first step is to select pigment carbon black with a particle size of 50 to 100 nm, and add pigment carbon black and dispersant to the dispersion medium to pre-disperse pigment carbon black slurry for use. The mass ratio of medium to pigment carbon black was 5:1.

[0102] In the second step, carbon nanotubes with a diameter of 65 to 85 nm and a length of 11 to 15 μm are selected, and the carbon nanotubes and the dispersant are added to the dispersion medium and pre-dispersed into a carbon nanotube dispersion liquid for later use, wherein the carbon nanotubes are dispersed in the carbon nanotubes. In the liquid, the mass ratio of dispersion medium to carbon nanotubes is 10:1.

[0103] The third step is to add a dispersion medium to the epoxy resin under stirring for dilution, and then add the pigment carbon black slurry in the first step and the carbon nanotube dispersion in the second step in a mass ratio of 5:1. Wherein, the defoamer is added after stirring evenly,...

Embodiment 2

[0109] The preparation method of embodiment 2 is basically the same as the preparation method of embodiment 1, and the difference is:

[0110] In the second step, carbon microporous spheres with a diameter of 65 to 85 nm and a length of 11 to 15 μm are selected, and the carbon microporous spheres and the dispersant are added to the dispersion medium to pre-disperse into a carbon microporous sphere dispersion for later use; correspondingly , in the third step, the pigment carbon black slurry and the carbon microporous ball dispersion liquid are added to the epoxy resin in a mass ratio of 5:1.

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Abstract

The invention provides a preparation method of an ultra-black composite coating, and the method comprises the following steps: providing a circuit board which comprises a bonding pad; forming a photosensitive resin layer on the circuit board; exposing the photosensitive resin layer; forming an ultra-black coating layer on the exposed photosensitive resin layer; forming a transparent photosensitive resin layer on the ultra-black coating layer; and exposing the transparent photosensitive resin layer, and developing the exposed transparent photosensitive resin layer and the exposed photosensitive resin to expose the bonding pad so as to obtain the ultra-black composite coating. The ultra-black composite coating prepared by the method has the characteristics of higher adhesive force, higher insulation resistance and more consistent reflectivity to light. The invention also provides the ultra-black composite coating prepared by the preparation method.

Description

technical field [0001] The invention relates to the technical field of materials for display screens, in particular to an ultra-black composite coating and a preparation method thereof. Background technique [0002] As a mainstream display product in the display industry, display devices such as LED display have the characteristics of high brightness, wide viewing angle and long life, and are widely used in indoor and outdoor advertising, sports, conference display and security command. etc. scene. High contrast has always been an important indicator pursued by LED displays. High contrast can make the screen display more delicate and layered, providing the ultimate viewing experience. [0003] Currently, one of the directions to improve the contrast of the display is to reduce the darkness of the display when the screen is off by using ultra-black materials. However, the ultra-black material has higher requirements on the surface treatment of the substrate of the PCB board...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H05K1/02H05K3/00G09F9/30G02B5/00
CPCH05K1/0274H05K3/00G09F9/30G02B5/003
Inventor 肖昴刘凌俊刘杰刘世良
Owner UNILUMIN GRP