Fiber array ultra-black material and preparation method thereof

An ultra-black material and array technology, applied in fiber processing, dyeing, physical processing, etc., can solve the problems of carbon tube array preparation temperature growth, limited practical application, poor adhesion of the array structure and large-area transfer, etc., and achieve excellent light absorption. performance, reflection reduction, stray light suppression effects

Active Publication Date: 2020-04-03
THE NAT CENT FOR NANOSCI & TECH NCNST OF CHINA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although this ultra-black structure has excellent light-absorbing effects in the entire spectral range, the carbon tube array requires a high preparation temperature (>450°C) and cannot be grown in situ on most substrates, and the adhesion of the array structure It is difficult to carry out large-scale transfer, and these shortcomings seriously limit its practical application.
[0007] In order to solve the above-mentioned preparation problems of ultra-black materials and ensure a high light absorption rate, it is necessary to research and design a new type of ultra-black materials and their preparation methods

Method used

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  • Fiber array ultra-black material and preparation method thereof
  • Fiber array ultra-black material and preparation method thereof
  • Fiber array ultra-black material and preparation method thereof

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preparation example Construction

[0072] The invention provides a fiber array ultra-black material and a preparation method thereof, the preparation method comprising the following steps:

[0073] The first step, fiber pretreatment: the fiber filaments are cut into a certain length of chopped fibers by a fiber cutter, and the chopped fibers are sieved by a mechanical vibrating screen for 2 hours. Chopped fibers pass through screens of different meshes, and fibers with similar lengths stay in the same mesh. After sieving, the chopped fibers have high consistency in length and good dispersion. The mesh numbers of the sieves are respectively: 50 mesh, 100 mesh, 200 mesh, 300 mesh and 400 mesh. In particular, for nylon fibers, due to their inherently transparent and colorless, poor insulation and electrical conductivity, they need to be dyed black and electrophoresis before sieving; the black dyeing process uses nigrosine acid dyes to dye colorless and transparent nylon fibers. Turn into black; Electrodeposition ...

Embodiment 1

[0081] Put black nylon chopped fibers with a length of 0.6mm in a mechanical vibrating sieve and sieve for 2 hours. Take out 1g and evenly disperse it on the metal plate under the high-voltage electrostatic device; cut the aluminum foil substrate of 15×15cm, and stick it on the surface of the upper metal plate with tape, clean the surface of the aluminum foil with ethanol and acetone respectively; weigh 1g of acrylate adhesive Glue, use SZQ film applicator to evenly coat the surface of the substrate, the wet film thickness is 250μm; close the electrostatic flocking device, adjust the distance between the plates to 10cm, turn on the high-voltage DC power supply, adjust the voltage to 40kV to prepare fiber arrays, and the power-on time is 20s; Take out the prepared fiber array together with the flat electrode and put it into a vacuum oven, and cure it in a vacuum at 80°C for 1 hour; use compressed air to comb the surface of the cured fiber array through a nozzle, and use scotch t...

Embodiment 2

[0084] The polyacrylonitrile-based carbon fiber with a length of 0.4 mm was placed in a mechanical vibrating sieve for 2 hours, and the mesh numbers of the mesh were as follows: 50 mesh, 100 mesh, 200 mesh, 300 mesh and 400 mesh; the fiber samples on the 300 mesh mesh were Take out 1g and evenly disperse it on the lower plate of the high-voltage electrostatic device; cut a 20×20cm carbon fiber composite material plate, use double-sided tape to flatten the carbon fiber plate on the surface of the upper plate, clean the surface with ethanol and acetone respectively; weigh 1g Epoxy adhesive, use a wire rod to evenly coat the surface of the substrate, the wet film thickness is 200μm; set up an electrostatic flocking device, adjust the distance between the plates to 10cm, and put a nylon screen frame in parallel between the plates, the mesh size 100 mesh; turn on the high-voltage DC power supply, adjust the voltage to 30kV to prepare fiber arrays, and power on for 20s; put the prepa...

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Abstract

The invention provides a fiber array ultra-black material and a preparation method thereof. The preparation method disclosed by the invention comprises the following steps of: 1) screening chopped fibers, 2) coating adhesive glue on asubstrate, 3) putting the chopped fibers screened in the step 1) into a high-voltage electrostatic device, wherein the chopped fibers vertically fly to the surface ofthe substrate coated with the adhesive glue in the step 2) under the action of a high-voltage electric field to form a fiber array, 4) carrying out curing and surface carding on the fiber array obtained in the step 3), and 5) etching the surface of the fiber array subjected to curing and surface carding treatment in the step 4) to prepare the fiber array ultra-black material. The fiber array ultra-black material provided by the invention has excellent light absorption characteristics, has the visible light range absorptivity exceeding 99%, also has high bonding strength, low outgassing rate and excellent high temperature resistance and corrosion resistance, and has wide application prospects in the fields of aerospace, solar energy absorption, optical instruments and the like.

Description

technical field [0001] The invention belongs to the technical field of ultra-black materials, and relates to a fiber array ultra-black material and a preparation method thereof. Background technique [0002] Since Kirchhoff expounded the concept of black body and Planck created the law of black body radiation more than a hundred years ago, ultra-black materials have been the object of continuous research by scientists. Ultra-black material is a surface structure material with ultra-high light absorption rate (generally over 98%) and extremely low reflectivity in the visible light range, which can effectively reduce adverse reflection and absorb scattered light to a maximum extent, and can be applied to optics Instrument structural components, detection satellites and solar energy conversion devices. [0003] An ideal ultra-black material would absorb all light that hits its surface, i.e. there would be no reflection and no transmission. However, the actual material has a s...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B05D1/06B05D3/00B05D3/04D06P1/39D06P3/24D06M10/06
CPCB05D1/06B05D3/007B05D3/0453D06P1/39D06P3/241D06M10/06
Inventor 蔡文甫屠策张晖张忠
Owner THE NAT CENT FOR NANOSCI & TECH NCNST OF CHINA
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