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CN-121992331-A - Manufacturing process of liquid hydrogen storage tank with carbon-based anti-seepage coating on inner wall

CN121992331ACN 121992331 ACN121992331 ACN 121992331ACN-121992331-A

Abstract

The invention discloses a manufacturing process of a liquid hydrogen storage tank with a carbon-based anti-seepage coating on the inner wall. The carbon-based anti-seepage coating comprises carbon nanotubes and polymer resin, wherein the mass fraction of the carbon nanotubes in the carbon-based anti-seepage coating is 30% -50%. Coating a carbon-based anti-seepage coating on the surface of the inner wall of the liquid hydrogen storage tank matrix, and curing the carbon-based anti-seepage coating to obtain the liquid hydrogen storage tank with the carbon-based anti-seepage coating on the inner wall. Wherein the thickness of the carbon-based impermeable coating is 30+/-5 mu m. The carbon-based anti-seepage coating of the liquid hydrogen storage tank prepared by the method has the advantages of strong adhesive force, excellent anti-seepage performance, high pressure resistance, uniform carbon-based anti-seepage coating in the preparation process, and no defects such as bubbles, cracks and the like.

Inventors

  • ZHANG YANSONG
  • ZHAO LIANG
  • WU MAOQING
  • ZHANG BIN
  • FENG ZHUOXING

Assignees

  • 北京科泰克科技有限责任公司

Dates

Publication Date
20260508
Application Date
20251226

Claims (10)

  1. 1. The manufacturing process of the liquid hydrogen storage tank with the carbon-based anti-seepage coating on the inner wall is characterized by comprising the following steps of: preparing a liquid hydrogen storage tank matrix and a carbon-based anti-seepage coating, wherein the carbon-based anti-seepage coating comprises carbon nano tubes and polymer resin, and the mass fraction of the carbon nano tubes in the carbon-based anti-seepage coating is 30% -50%; and coating the carbon-based anti-seepage coating on the surface of the inner wall of the liquid hydrogen storage tank matrix, and curing the carbon-based anti-seepage coating to obtain the liquid hydrogen storage tank with the carbon-based anti-seepage coating on the inner wall, wherein the thickness of the carbon-based anti-seepage coating is 30+/-5 mu m.
  2. 2. The manufacturing process according to claim 1, wherein, In the process of curing the carbon-based anti-seepage coating, the curing temperature is 150 ℃ and the curing time is 2 hours.
  3. 3. The manufacturing process according to claim 1, wherein, And in the process of coating the carbon-based anti-seepage coating, the carbon-based anti-seepage coating is sprayed by carrier gas containing a gas active agent.
  4. 4. The manufacturing process according to claim 3, wherein, The pressure of the carrier gas is maintained at 1-2bar.
  5. 5. The manufacturing process according to claim 1, wherein, Before the inner wall surface of the liquid hydrogen storage tank matrix is coated with the carbon-based anti-seepage coating, the inner wall surface of the liquid hydrogen storage tank matrix is cleaned, and then the inner wall surface of the liquid hydrogen storage tank matrix is roughened.
  6. 6. The manufacturing process according to claim 5, wherein, And roughening the inner wall surface of the liquid hydrogen storage tank matrix by plasma spraying.
  7. 7. The manufacturing process according to claim 5, wherein, The inner wall surface of the liquid hydrogen storage tank substrate is cleaned by ultrasonic cleaning, and then cleaned by acidic solution.
  8. 8. The manufacturing process according to claim 1, wherein, And after the liquid hydrogen storage tank with the carbon-based anti-seepage coating on the inner wall is obtained, detecting the thickness of the carbon-based anti-seepage coating on the liquid hydrogen storage tank, and detecting the adhesiveness and the air tightness of the carbon-based anti-seepage coating.
  9. 9. The manufacturing process according to claim 8, wherein, And in the process of detecting the air tightness of the liquid hydrogen storage tank, maintaining the pressure not lower than 100MPa.
  10. 10. The manufacturing process according to claim 8, wherein, And detecting the thickness of the carbon-based impermeable coating of the liquid hydrogen storage tank through ultrasonic detection.

Description

Manufacturing process of liquid hydrogen storage tank with carbon-based anti-seepage coating on inner wall Technical Field The invention relates to the field of seepage prevention and protection of hydrogen storage cylinders for aviation, in particular to a manufacturing process of a liquid hydrogen storage tank with a carbon-based seepage prevention coating on the inner wall. Background With the rapid development of aerospace technology, hydrogen is used as an energy carrier with high energy density, and the application of the hydrogen in an aerospace vehicle propulsion system is gradually increased. In order to realize safe and efficient hydrogen storage and transportation, the safety and air tightness of the liquid hydrogen storage tank become critical technical requirements. The inner wall coating of the liquid hydrogen storage tank is an important component for ensuring the air tightness, the pressure resistance and the corrosion resistance. In order to meet the requirements of high safety, reliability and long-term stability of liquid hydrogen storage tanks in aerospace applications, coating technology is continuously innovated. The traditional coating materials and processes generally face the problems of weak coating adhesion, insufficient pressure resistance, poor gas permeability and the like, and are difficult to meet the strict requirements of the aerospace field on a liquid hydrogen storage tank. The existing coating technology for the inner wall of the liquid hydrogen storage tank mainly adopts traditional coating materials and processes, such as a metal coating or a common polymer coating, although a certain protection function can be provided, the existing coating technology still has poor adhesive force and pressure resistance, particularly in the hydrogen environment, the coating is easy to peel off, fall off or crack, so that hydrogen leakage or permeation is caused, the safety and the tightness of the liquid hydrogen storage tank are seriously influenced, the existing coating materials are poor in permeability and air tightness, the leakage and the permeation of the hydrogen cannot be effectively prevented, potential safety hazards exist in the long-time use process of the liquid hydrogen storage tank, and the traditional cleaning and surface treatment processes often cannot thoroughly remove inner wall pollutants, so that the coating is uneven in adhesion and unstable in quality, and the overall performance of the liquid hydrogen storage tank is further influenced. Disclosure of Invention The invention provides a manufacturing process of a liquid hydrogen storage tank with a carbon-based anti-seepage coating on the inner wall, which can obviously improve the anti-seepage property and air tightness of the carbon-based anti-seepage coating and reduce the hydrogen leakage rate and the seepage quantity to extremely low levels. The invention adopts the following technical scheme: the invention provides a manufacturing process of a liquid hydrogen storage tank with a carbon-based anti-seepage coating on the inner wall. The carbon-based anti-seepage coating comprises carbon nanotubes and polymer resin, wherein the mass fraction of the carbon nanotubes in the carbon-based anti-seepage coating is 30% -50%. Coating a carbon-based anti-seepage coating on the surface of the inner wall of the liquid hydrogen storage tank matrix, and curing the carbon-based anti-seepage coating to obtain the liquid hydrogen storage tank with the carbon-based anti-seepage coating on the inner wall. Wherein the thickness of the carbon-based impermeable coating is 30+/-5 mu m. Further, in the process of curing the carbon-based anti-seepage coating, the curing temperature is 150 ℃ and the curing time is 2 hours. Further, during the process of coating the carbon-based barrier coating, the carbon-based barrier coating is sprayed by a carrier gas containing a gas activator. Further, the pressure of the carrier gas is maintained at 1-2bar. Further, before the inner wall surface of the liquid hydrogen storage tank matrix is coated with the carbon-based anti-seepage coating, the inner wall surface of the liquid hydrogen storage tank matrix is cleaned, and then the inner wall surface of the liquid hydrogen storage tank matrix is roughened. Further, the inner wall surface of the liquid hydrogen tank base body is roughened by plasma spraying. Further, the inner wall surface of the liquid hydrogen storage tank substrate is cleaned by ultrasonic cleaning, and then cleaned by acidic solution. Further, after the liquid hydrogen storage tank with the carbon-based anti-seepage coating on the inner wall is obtained, the liquid hydrogen storage tank is subjected to carbon-based anti-seepage coating thickness detection, carbon-based anti-seepage coating adhesion test and air tightness detection. Further, in the process of detecting the air tightness of the liquid hydrogen storage tank, the pressure is kept to be not lower than 100MPa. Fur