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CN-121975255-A - High-explosion-resistance fluororubber for hydrogen energy sealing and preparation method and application thereof

CN121975255ACN 121975255 ACN121975255 ACN 121975255ACN-121975255-A

Abstract

The invention provides high-explosion-resistance fluororubber for hydrogen energy sealing, and a preparation method and application thereof, and belongs to the field of chemical materials. The modified fluororubber is prepared from the following raw materials, by weight, 100 parts of fluororubber raw rubber, 2-5 parts of a vulcanizing agent, 3-6 parts of a crosslinking agent, 15-35 parts of white carbon black, 10-40 parts of diatomite, 10-20 parts of wollastonite, 1-2 parts of a white carbon black dispersing agent and 1-2 parts of an internal mold release agent. According to the invention, white carbon black, diatomite and wollastonite are adopted as main fillers, and the prepared fluororubber has high antiknock property, extremely low air permeability and air permeability coefficient through compounding the three different forms of fillers, and simultaneously has high hardness and excellent mechanical properties, so that the long-term reliability and safety requirements of a hydrogen energy system on a sealing material under a high-pressure working condition of 70MPa can be met, and a long-acting and reliable sealing solution is provided for hydrogen energy equipment.

Inventors

  • ZHU SHIJIANG
  • HOU YU
  • WU WENQIANG
  • WEI HONGXING

Assignees

  • 四川道弘新材料股份有限公司

Dates

Publication Date
20260505
Application Date
20260227

Claims (9)

  1. 1. The fluororubber is characterized by being prepared from the following raw materials, by weight, 100 parts of fluororubber raw rubber, 2-5 parts of vulcanizing agent, 3-6 parts of cross-linking agent, 15-35 parts of white carbon black, 10-40 parts of diatomite, 10-20 parts of wollastonite, 1-2 parts of white carbon black dispersing agent and 1-2 parts of internal mold release agent.
  2. 2. The fluororubber according to claim 1 is prepared from the following raw materials, by weight, 100 parts of fluororubber raw rubber, 3 parts of a vulcanizing agent, 4-5 parts of a cross-linking agent, 25-35 parts of white carbon black, 10-25 parts of kieselguhr, 10-15 parts of wollastonite, 1 part of a white carbon black dispersing agent and 1-1.5 parts of an internal mold release agent.
  3. 3. The fluororubber according to claim 2, which is prepared from the following raw materials, by weight, 100 parts of fluororubber raw rubber, 3 parts of a vulcanizing agent, 4 parts of a crosslinking agent, 25 parts of white carbon black, 25 parts of diatomite, 10 parts of wollastonite, 1 part of a white carbon black dispersing agent and 1 part of an internal mold release agent.
  4. 4. The fluororubber according to any one of claims 1 to 3, wherein the raw fluororubber is a peroxyfluororubber, the vulcanizing agent is a peroxide vulcanizing agent, the crosslinking agent comprises an allyl crosslinking agent or an acrylate crosslinking agent, the white carbon black comprises 360-precipitation white carbon black, R972 gas-phase white carbon black or TS622 gas-phase white carbon black, the diatomite comprises diatomite F, diatomite Q or diatomite MW, the wollastonite comprises 283-600EST, 600EST or 503EST, the white carbon black dispersing agent comprises KB-6B, KB-6W or KB-6Q, and the internal release agent is a mixture of a silicon-free release agent and an organosiloxane release agent.
  5. 5. The fluororubber according to claim 4, wherein the Mooney viscosity of the peroxyfluororubber is 40-60, the peroxide vulcanizing agent comprises 2, 5-dimethyl-2, 5-di- (tert-butylperoxy) hexane, dicumyl peroxide, 1-di (tert-butylperoxy) -3, 5-trimethylcyclohexane or tert-butylcumyl peroxide, the allyl crosslinking agent comprises triallyl isocyanurate, triallyl cyanurate or triallyl trimellitate, the acrylate crosslinking agent comprises trimethylolpropane trimethacrylate, trimethylolpropane triacrylate, pentaerythritol triacrylate or glycerol triacrylate, the silicon-free release agent comprises HT290, HT254, zinc stearate or FK107, the organosiloxane release agent comprises WS280, WB212, WB222 or RS280, and the mass ratio of the silicon-free release agent to the organosiloxane release agent is 1:0.5-1.
  6. 6. The method for producing a fluororubber according to any one of claims 1 to 5, comprising the steps of: (1) Uniformly mixing raw fluororubber, white carbon black and a white carbon black dispersing agent, adding a vulcanizing agent, a cross-linking agent, diatomite, wollastonite and an inner mold release agent, mixing, and then carrying out thin-pass and sheet discharging, and carrying out secondary remixing to obtain a fluororubber composite material; (2) And (3) putting the fluororubber composite material into a mould for vulcanization and compression molding, and then performing secondary vulcanization to obtain fluororubber.
  7. 7. The preparation method of the fluororubber, white carbon black and white carbon black dispersing agent according to claim 6, wherein the mixing temperature of fluororubber raw rubber, white carbon black and white carbon black dispersing agent in the step (1) is 40-60 ℃, the rotating speed is 20-40 r/min, the time is 3-6 min, the temperature is raised to 70-90 ℃, the rotating speed is adjusted to 45-60 r/min, vulcanizing agent, cross-linking agent, diatomite, wollastonite and inner mold release agent are added for mixing for 5-15 min, the vulcanizing and compression molding conditions in the step (2) are 160-180 ℃, 10-20 MPa, 5-20 min, and the secondary vulcanizing conditions are 200-230 ℃ and 4-12 h.
  8. 8. The use of the fluororubber according to any one of claims 1 to 5 for producing a high-pressure sealing material in the field of hydrogen energy.
  9. 9. The use according to claim 8, wherein the hydrogen energy field high pressure sealing material comprises O-rings, gaskets or hoses for hydrogen energy transport pipes, hydrogen loading transport pipes, high pressure hydrogen storage tanks, hydrogenation guns or fuel cell seals.

Description

High-explosion-resistance fluororubber for hydrogen energy sealing and preparation method and application thereof Technical Field The invention belongs to the field of chemical materials, and particularly relates to high-antiknock fluororubber for hydrogen energy sealing, and a preparation method and application thereof. Background The hydrogen energy is used as a clean and efficient energy carrier, and the key of the industrialized application is a safe and reliable storage and conveying system. The hydrogen energy equipment, such as a high-pressure hydrogen storage bottle, a hydrogenation station pipeline, a compressor and the like, works under severe working conditions of high pressure (usually more than 35MPa, and developed to 70MPa and even 90 MPa), wide temperature range (-40 ℃ to 150 ℃) and Rapid Gas Depressurization (RGD) for a long time, and the severe working conditions put very high requirements on the comprehensive performance of the sealing material, and the operational safety and the service life of the hydrogen energy equipment are directly determined by the performance of the sealing material. The sealing material for the hydrogen energy equipment needs to meet multiple core performance requirements, namely, the sealing material needs to have extremely low hydrogen permeability, extremely high hydrogen molecular radius, extremely easy penetration into the sealing material to form leakage, extremely high possibility of causing sealing failure, influencing system operation efficiency, causing hydrogen accumulation and serious potential safety hazards such as explosion and combustion, and therefore extremely low hydrogen permeability is one of core performance indexes of the sealing material, the sealing material needs to have excellent high-pressure anti-explosion performance, micro pores and microcracks are easily generated in the sealing material under the repeated impact and long-term action of high-pressure hydrogen, the defects are continuously expanded, finally, the sealing material is broken, sealing failure is caused, safety accidents such as hydrogen leakage are caused, and the sealing material needs to have good hydrogen brittleness resistance, hydrogen is easily permeated into the sealing material in an atomic form under a high-pressure environment, is adsorbed in lattice defect of the material, the plasticity and toughness of the sealing material are remarkably reduced, the sealing material is easily broken, namely, the long-term reliability of the sealing material is seriously influenced, and the sealing material needs to have long-term chemical stability, and long-term physical and chemical-stability, the sealing performance is ensured under the high-pressure and complex, and long-temperature degradation performance, and the sealing performance is not required to be degraded. At present, fluororubber has excellent heat resistance, medium resistance and certain high pressure resistance, is one of the most widely applied rubber sealing materials in a hydrogen energy sealing scene, but the existing fluororubber has insufficient antiknock property under the working condition of high pressure hydrogen of 35MPa and above, hydrogen is easy to dissolve and diffuse in the material in the long-term use process, so that the problems of hydrogen dissolution swelling, internal microcrack expansion and the like of the material occur, meanwhile, the compression set of the fluororubber can be obviously increased along with the prolonged use time, further the sealing performance is continuously attenuated and finally fails, serious potential safety hazards exist, on the other hand, the hydrogen resistance performance of the existing fluororubber still has larger lifting space, the hydrogen permeability can not meet the strict requirement of the high-end hydrogen energy sealing scene, the hydrogen leakage can not be effectively prevented, and the application range of the fluororubber is further limited. Therefore, optimization of fluororubber is needed to improve the antiknock performance, low hydrogen permeability and long-term sealing stability of fluororubber under high-pressure hydrogen environment so as to meet the long-term reliability and safety requirements of a hydrogen energy system on sealing materials under high-pressure working conditions. Disclosure of Invention The invention aims to provide high-resistance fluororubber for hydrogen energy sealing, and a preparation method and application thereof. The invention provides fluororubber which is prepared from the following raw materials, by weight, 100 parts of fluororubber raw rubber, 2-5 parts of a vulcanizing agent, 3-6 parts of a cross-linking agent, 15-35 parts of white carbon black, 10-40 parts of diatomite, 10-20 parts of wollastonite, 1-2 parts of a white carbon black dispersing agent and 1-2 parts of an internal mold release agent. Further, the material is prepared from the following raw materials in parts by weight: 100 parts o