Search

CN-122013214-A - Hydrogen production electrolytic tank pole frame sealing assembly and preparation method thereof

CN122013214ACN 122013214 ACN122013214 ACN 122013214ACN-122013214-A

Abstract

The invention provides a hydrogen production electrolytic tank pole frame sealing component and a preparation method thereof, the assembly comprises a stainless steel pole frame, an adhesive layer arranged between the pole frame and a rubber layer, and a rubber layer integrally formed with the pole frame. The method comprises the steps of carrying out surface treatment, cleaning and degreasing on a bonding surface of a pole frame, protecting a non-bonding surface, dip-coating Chemlok AP133 adhesive solution on the bonding surface, airing to form a glue film, mixing ethylene propylene diene monomer rubber, butyl rubber, reinforcing filler, a vulcanization system and a tackifying component, preforming, closing a die under a vacuum pumping condition, carrying out press vulcanization to enable a rubber layer and the pole frame to be combined through the glue film, trimming a finished product, cleaning and drying. The scheme is favorable for improving the bonding stability of a metal-rubber interface and the sealing and insulating reliability, and meets the stacking and assembling requirements of the electrolytic tank.

Inventors

  • LI FEIXIANG
  • CHAO HAIYANG
  • LIU MING
  • WANG YI
  • YU QIQI

Assignees

  • 西北橡胶塑料研究设计院有限公司

Dates

Publication Date
20260512
Application Date
20260204

Claims (10)

  1. 1. The preparation method of the hydrogen production electrolytic tank pole frame sealing assembly is characterized by comprising the following steps of: A. the method comprises the steps of performing pole frame pretreatment, namely providing a stainless steel pole frame, performing surface treatment on the bonding surface of the stainless steel pole frame, cleaning and degreasing, and protecting the non-bonding surface of the stainless steel pole frame; B. Preparing ChemlokAP adhesive solution, dip-coating the adhesive surface treated in the step A, and airing to form an adhesive film on the adhesive surface; C. Mixing and preforming ethylene propylene diene monomer, butyl rubber, reinforcing filler, a vulcanization system and a tackifying component to obtain a rubber compound, and preforming the rubber compound into a rubber preform matched with the stainless steel polar frame; D. Vacuum mold pressing vulcanization, namely placing the stainless steel pole frame and the rubber prefabricated member in a mold, closing the mold under the vacuumizing condition, and pressing vulcanization to enable the rubber prefabricated member and the bonding surface to form an integrated rubber sealing layer through the adhesive film; E. And (3) post-treatment, namely trimming, cleaning and drying the vulcanized assembly to obtain the hydrogen production electrolytic tank pole frame sealing assembly.
  2. 2. The preparation method of the anti-adhesion coating according to claim 1, wherein the protection of the non-adhesion surface in the step A comprises the steps of attaching a polymer protection film to the non-adhesion surface, and the cleaning degreasing in the step A comprises the steps of sequentially performing gasoline cleaning and ethyl acetate degreasing, soaking and cleaning in absolute ethyl alcohol for 5min, and then performing nitrogen blow-drying.
  3. 3. The method according to claim 1, wherein the surface treatment of the bonding surface in the step A comprises a blasting treatment or a chemical activation treatment, wherein the blasting treatment adopts 120 mesh white corundum sand with a blasting pressure of 0.5MPa to make the surface roughness of the bonding surface 3.2 μm, and the chemical activation treatment adopts nitric acid-hydrofluoric acid solution to activate the bonding surface.
  4. 4. The preparation method according to claim 1, wherein the ChemlokAP adhesive solution in the step B is obtained by mixing ChemlokAP adhesive and absolute ethyl alcohol according to a volume ratio of 1:1 or 1:0.8, and the air-drying condition is that the adhesive is air-dried for 30min at 25 ℃, and an adhesive film with a thickness of 2 μm-4 μm is formed after the air-drying.
  5. 5. The method according to claim 1, wherein the dip coating in step B is performed by dip coating at a dipping speed of 10mm/s and a pulling speed of 2mm/s.
  6. 6. The preparation method of the rubber compound as claimed in claim 1, wherein the rubber compound in the step C comprises, by mass, 50% of ethylene propylene diene monomer, 30% of butyl rubber, 2% of carbon black N55015%, 2% of vulcanizing agent DCP and 3% of resin tackifier, or comprises, by mass, 36% of ethylene propylene diene monomer, 20% of butyl rubber and 2% of nano alumina.
  7. 7. The method according to claim 1, wherein the mixing in the step C comprises a first-stage mixing at 60 ℃ for 8min and a second-stage mixing at 40 ℃ with a vulcanizing agent added for 3min, and the thickness of the resulting sheet is 1.5mm + -0.1 mm.
  8. 8. The method according to claim 1, wherein the vacuum press-molding vulcanization in the step D is performed on a vacuum-pumping press vulcanizer, and the vacuum degree is-0.095 MPa and maintained for 5min after mold closing, and the press-vulcanization satisfies any one of the following conditions: (1) The temperature of the die is 160 ℃ plus or minus 5 ℃, the vulcanization pressure is 12MPa plus or minus 2MPa, and the vulcanization time is 18min plus or minus 1min; (2) After holding at 140 ℃ for 5min, the temperature is raised to 160 ℃ and held for 15min; (3) Vulcanizing for 30min under 150 ℃.
  9. 9. The method according to claim 1, wherein the post-treatment in the step E comprises trimming with a laser cutter with a trimming precision of + -0.05 mm, washing with ultrasonic wave with a frequency of 40kHz and washing with deionized water for 10min at 50 ℃, drying for 30min in a 80 ℃ hot air circulation oven and nitrogen purging.
  10. 10. The method of claim 1, wherein the step E further comprises heat treating at 120℃for 2 hours to relieve residual stress.

Description

Hydrogen production electrolytic tank pole frame sealing assembly and preparation method thereof Technical Field The invention belongs to the technical field of hydrogen production by an electrolytic cell, and particularly relates to a hydrogen production electrolytic cell pole frame sealing assembly and a preparation method thereof. Background The hydrogen production by water electrolysis is an important green hydrogen production technical route, and the core equipment is an electrolytic tank. The electrolytic tank is generally in a stacked structure, and a sealing interface is formed by assembling parts such as a pole frame, an end plate, a pole plate, a sealing element and the like, wherein the sealing performance is an essential precondition for stable operation and power improvement. In actual operation, the electrolytic tank needs to work for a long time under the condition of continuous pre-tightening load and simultaneously faces comprehensive working conditions such as high pressure, strong acid or strong alkali medium environment and the like, so that the sealing element not only needs to meet the isolation requirement of gas and liquid, but also needs to keep reliable sealing contact and insulation level under the actions of electrolyte infiltration, temperature fluctuation and long-term compression deformation. In the prior art, polytetrafluoroethylene sealing elements are often adopted in the traditional electrolytic tank, however, along with the development of the hydrogen production technology of the electrolytic tank, limitations brought by material characteristics of the electrolytic tank gradually appear, namely polytetrafluoroethylene is easy to creep under continuous load, so that a sealing interface gap is increased along with time and leakage risk is increased, meanwhile, the polytetrafluoroethylene is mostly physically attached to a metal electrode frame, micro deformation in the lamination assembly process of the electrolytic tank is difficult to adapt, exposure is likely to occur under the action of continuous load for a long time, and in addition, the surface of the polytetrafluoroethylene is easy to adsorb electrolyte ions, the actual insulation resistance is likely to be obviously reduced, so that adverse effects are brought to the safe operation and insulation reliability of the electrolytic tank. Rubber materials are widely used for sealing scenes because of their elastic restoring ability. Aiming at the working condition and the working temperature of acid-base medium of the electrolytic tank, ethylene propylene diene monomer is one of more common rubber materials, but the independent rubber sealing piece has the defect of compression resistance and maintenance, and the installation and the matching are relatively complex, so that the engineering is often required to develop an integrated molding scheme of a polar frame or polar plate and the rubber sealing piece. However, ethylene propylene diene monomer belongs to saturated nonpolar rubber, is difficult to form stable and firm interface combination with a metal polar frame, generally needs to improve bonding strength and consistency by means of complex surface polarization treatment and multi-component adhesive coating technology in practice, but the multilayer coating mode is easy to cause thicker or uneven adhesive layers, further increases the difficulty in controlling the dimension consistency, and possibly influences the assembly stability of a sealing interface. On the other hand, as the electrolytic tank is developed to the large-scale and high power density direction, metal skeleton components such as a pole frame and the like are required to be thin-walled and assembled with high precision, for example, the thickness of the pole frame can be not more than 1 mm, the overall dimension is large, and higher requirements are put on the control of buckling deformation. Although rubber and metal compounding can be realized by adopting modes such as compression molding or injection molding, the traditional rubber-metal compounding process often needs multi-step matching, has lower overall efficiency, and easily introduces manufacturing risks such as deformation or scratch and the like under the condition of a thin-wall metal framework, thereby reducing the engineering quality stability of the preparation of the integrated sealing component. Therefore, a need exists for a hydrogen production electrolyzer pole frame sealing assembly and a preparation method thereof, which can give consideration to the reliable combination of metal and rubber interfaces, the long-term stability of sealing and insulating properties and adapt to the requirements of precision assembly of thin pole frame lamination on flatness and consistency on the premise of meeting the conditions of electrolyte medium environment and long-term load, thereby solving the problems of easy creep leakage, unstable interface combination, complex process, limited cons