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A method for preparing fiber pyrolysis carbon coating by electrophoretic deposition of polydopamine

A technology of polydopamine and electrophoretic deposition, applied in the direction of electrolytic coating, coating, electrophoretic plating, etc., can solve the problems of harmful gas emission, low efficiency and high cost

Active Publication Date: 2021-07-06
DALIAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, this method uses hydrogen as the reducing gas source, which has high requirements on equipment; moreover, in order to obtain a pyrolytic carbon coating with a thickness of 100 nanometers, it often requires dozens or even hundreds of hours of chemical vapor deposition at high temperature, and the cost is relatively high. High risk factor; in addition, it is often accompanied by the emission of harmful gases such as carbon monoxide, and there is a problem of difficulty in tail gas treatment
[0005] In view of the difficulty in preparing uniform and dense pyrolytic carbon coatings by the precursor method, and the problems of low efficiency, high cost and harmful gas emissions in the chemical vapor deposition method, it is necessary to develop a high-efficiency, low-cost, and green method To prepare uniform and dense pyrolytic carbon coating

Method used

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  • A method for preparing fiber pyrolysis carbon coating by electrophoretic deposition of polydopamine
  • A method for preparing fiber pyrolysis carbon coating by electrophoretic deposition of polydopamine
  • A method for preparing fiber pyrolysis carbon coating by electrophoretic deposition of polydopamine

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Embodiment 1

[0026] A method for preparing fiber pyrolytic carbon coatings by electrophoretic deposition of polydopamine, using the characteristics of charged polydopamine monomers formed after dopamine is oxidized in an alkaline environment, and making charged polydopamine monomers to the fiber surface through electrophoretic deposition technology Aggregate and polymerize to form a uniform and dense polydopamine coating, and finally prepare a pyrolytic carbon coating by pyrolyzing the polydopamine coating in a vacuum or an inert atmosphere. The specific steps include:

[0027] 1) First, use the pre-oxidation method to modify the T700 fiber with hydrophilic functional groups, place the fiber in the atmosphere, and pre-oxidize it at 500°C for 20 minutes, so that the fiber can form a good dispersion in the electrophoretic deposition solution and fully mix with the electrophoretic deposition solution. touch;

[0028] 2) Prepare a dopamine water-based solution as an electrophoretic deposition ...

Embodiment 2

[0034] The difference between this embodiment and embodiment 1 is that in step 3, the electrophoretic deposition time is 60 minutes, and other steps and test parameters are the same. Such as Figure 4 The scanning electron microscope schematic diagram of the polydopamine coating is shown, the polydopamine coating is uniform and dense, and the coating thickness is about 1717 nanometers. Such as Figure 5 The scanning electron microscope schematic of the cracked carbon coating is shown, and the thickness of the cracked carbon coating is about 698 nm.

Embodiment 3

[0036] The difference between this embodiment and embodiment 1 is that in step 3, the electric field strength is 400 volts per meter, the electrophoretic deposition time is 20 minutes, and other steps and test parameters are the same. The polydopamine coating is uniform and dense, and the coating thickness is about 1305 nanometers.

[0037] In summary, a method for preparing fiber pyrolytic carbon coatings by electrophoretic deposition of polydopamine in the present invention has the advantages of uniform and dense coating, controllable coating thickness and binding force, short preparation cycle, high efficiency, low cost, and green Safety and other advantages, easy to achieve process mass production.

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Abstract

The invention belongs to the technical field of fiber carbon coating preparation, and specifically relates to a method for preparing a fiber pyrolytic carbon coating by electrophoretic deposition of polydopamine. First, the characteristics of charged polydopamine monomers formed after oxidation of dopamine in an alkaline environment are utilized. By electrophoretic deposition technology, the charged polydopamine monomers are aggregated to the surface of the fiber and polymerized to form a uniform and dense polydopamine coating, and then the pyrolytic carbon coating of the fiber is prepared by cracking the polydopamine coating at high temperature. Effects and benefits of the present invention: a uniform and dense pyrolytic carbon coating can be prepared on the fiber surface, and can be adjusted by adjusting the electric field strength, electrophoretic deposition time, pH value of electrophoretic deposition solution, concentration of electrophoretic deposition solution, cracking temperature and cracking time, etc. The thickness and bonding force of the pyrolytic carbon coating are controlled by parameters, which has the advantages of high efficiency, low cost, green and safe, and is easy to realize process-based mass production.

Description

technical field [0001] The invention belongs to the technical field of fiber carbon coating preparation, and in particular relates to a method for preparing fiber pyrolytic carbon coating by electrophoretic deposition of polydopamine. Background technique [0002] Due to their excellent physical and mechanical properties, fiber-reinforced composite materials have been widely used as structural or functional materials in aerospace, atomic energy, medicine, machinery and other fields. The preparation of pyrolytic carbon coating on the fiber surface can play a key role in protecting the fiber from matrix erosion, improving the wettability of the fiber and the matrix, adjusting the fiber-matrix interface bonding, and improving the performance of the composite material during the preparation of the composite material. Pyrolytic carbon coating is a uniform and dense carbon material with a certain thickness that is formed on the surface of the fiber by thermal decomposition of hydr...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): D06M11/74D06M15/37C25D13/04
CPCC25D13/04D06M11/74D06M15/37
Inventor 祖宇飞刘应军沙建军田洪亮代吉祥苏成
Owner DALIAN UNIV OF TECH