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CN-121977071-A - High-temperature-resistant irradiation inflatable sealing ring for nuclear power station equipment gate and preparation method

CN121977071ACN 121977071 ACN121977071 ACN 121977071ACN-121977071-A

Abstract

The application discloses a high-temperature irradiation resistant inflatable sealing ring for a nuclear power station equipment gate and a preparation method thereof, wherein the sealing ring comprises an integrated hollow inflatable annular sealing body, the sealing body is sequentially compounded with an ethylene propylene diene monomer rubber outer layer, a nylon fiber woven reinforcing layer and a low gas permeation rubber inner layer from outside to inside, and the nylon fiber woven reinforcing layer is of a continuous and jointless integral woven structure and is adhered with the ethylene propylene diene monomer rubber outer layer and the low gas permeation rubber inner layer into a whole through an adhesive. Based on the known EPDM+chinlon fiber system, the application constructs a complete and reliable technical chain from materials to finished products by introducing a precise split combined die, a kem-roc 238 mucilage pretreatment bonding process and an optimized formula containing a radiation-resistant auxiliary agent, and solves the early failure problem caused by material failure, weak structure or insufficient verification of the traditional sealing ring.

Inventors

  • XU JILIANG
  • LI XIN
  • MIAO JING
  • JIN XIN
  • ZHU JIANG

Assignees

  • 沈阳橡胶研究设计院有限公司

Dates

Publication Date
20260505
Application Date
20260202

Claims (10)

  1. 1. The high-temperature irradiation resistant inflatable sealing ring for the nuclear power station equipment gate is characterized by comprising an integrated hollow inflatable annular sealing body, wherein the sealing body is sequentially compounded with an ethylene propylene diene monomer rubber outer layer, a nylon fiber woven reinforcing layer and a low-gas permeation rubber inner layer from outside to inside, and the nylon fiber woven reinforcing layer is of a continuous and jointless integral woven structure and is adhered with the ethylene propylene diene monomer rubber outer layer and the low-gas permeation rubber inner layer into a whole through an adhesive.
  2. 2. The high temperature radiation resistant inflatable gasket for a nuclear power plant equipment door of claim 1 wherein said adhesive comprises kemlock 238 and wherein the 180 ° peel strength between said nylon fiber braid reinforcement layer and said ethylene propylene diene monomer rubber outer layer is not less than 4.5N/mm.
  3. 3. The high temperature radiation resistant inflatable gasket for a nuclear power plant equipment door of claim 1, wherein the ethylene propylene diene monomer rubber outer layer is configured to provide environmental aging and wear protection, the nylon fiber braid reinforcement layer is configured to withstand internal inflation pressures and provide structural support, and the low gas permeation rubber inner layer is configured to block outward permeation of inflation media.
  4. 4. The high-temperature radiation resistant inflatable sealing ring for a nuclear power plant equipment gate according to claim 1, wherein the material of the ethylene propylene diene monomer rubber outer layer can bear gamma-ray radiation with accumulated dose not less than 1.21 x 10 x 7 rad.
  5. 5. The high temperature radiation resistant gas filled seal ring for nuclear power plant equipment gate of claim 1, wherein the accumulated dose experienced is After radiation, the compression set (150 ℃ C. X24 h) of the ethylene propylene diene monomer rubber outer layer is not more than 30%.
  6. 6. The high temperature irradiation resistant gas filled seal ring for a nuclear power plant equipment door of claim 1, wherein the annular seal body is configured to withstand no less than 60,000 cycles of gas filling-venting for no more than 60 seconds, or configured to withstand no less than 6,000 cycles of gas filling-venting for no more than 60 seconds.
  7. 7. The high temperature radiation resistant inflatable gasket for a nuclear power plant equipment door of claim 1, wherein the seal has a through leak rate of no more than 80sccm/m at a pressure differential of 200 kPa.
  8. 8. The preparation method of the high-temperature irradiation resistant inflatable sealing ring for the nuclear power station equipment gate is characterized by comprising the following steps of: S1, preparing sizing material, namely plasticating ethylene propylene diene monomer, sequentially adding an active agent, an anti-aging agent, a reinforcing filler, an irradiation-resistant auxiliary agent and a vulcanizing agent, uniformly mixing to prepare a rubber compound, and standing; s2, fabric pretreatment, namely cleaning a nylon fiber weaving layer, coating mucilage containing an adhesive, and then drying; S3, molding and vulcanizing, namely paving the pretreated fabric in a split combined mold, filling the rubber compound, and vulcanizing under the conditions of 165+/-5 ℃ and 10+/-0.5 MPa after mold closing; s4, post-treatment and detection, namely installing an inflation interface after demolding, and performing air tightness detection and size inspection.
  9. 9. The method for preparing the high-temperature radiation resistant inflatable sealing ring for the nuclear power station equipment gate according to claim 8, wherein the vulcanization condition in the step S3 is that the temperature is 165+/-5 ℃, the pressure is 10.0+/-0.5 MPa, and the time is 15 minutes.
  10. 10. The method for manufacturing the high-temperature-radiation-resistant inflatable sealing ring for the nuclear power station equipment gate according to claim 8, wherein the split combined die comprises a die (201), a lower side of the die (201) is provided with a die (202), a lower side of the die (202) is provided with a die (204), an upper side of the die (204) is provided with a die (203), the die (203) is matched with the inner side of the die (202), a cavity for forming the high-temperature-radiation-resistant inflatable sealing ring is formed in the inner side of the die (203), a numerical control machining center is adopted for precision machining of a split combined die cavity main body, a linear cutting and carving process is adopted for a key positioning structure, and the surface of the cavity is subjected to electric spark polishing treatment to ensure high precision and high finish.

Description

High-temperature-resistant irradiation inflatable sealing ring for nuclear power station equipment gate and preparation method Technical Field The application belongs to the technical field of sealing rings, and particularly relates to a high-temperature irradiation resistant inflatable sealing ring for a nuclear power station equipment gate and a preparation method thereof. Background Nuclear power plant gates (including equipment gates and personnel gates) are critical components for maintaining the integrity of a containment, and sealing rings of the nuclear power plant gates need to be under normal working conditions (-60-130 ℃), accident working conditions (such as LOCA:125 ℃ C./125 kPa; MSLB:150 ℃ C./200 kPa), and high irradiation environments (the accumulated dose is up to the maximum)) Reliable operation for a long time and meets extremely high leakage rate requirements (less than or equal to 80 sccm/m). At present, the technology is mainly imitated by imported products or technologies in the field at home, and the prior art has the following main defects and shortages: (1) The material system is imperfect, the conventional rubber sealing material is used in high dosage The molecular chain is easy to break, crosslink or oxidize under the radiation irradiation, so that the material is hardened, embrittled, lost in elasticity and increased in compression set, and the reliability requirement of the nuclear power station in 40 years (the design life of the sealing ring is 10 years) cannot be met. (2) The structural design and the process are extensive, the traditional inflatable sealing ring is molded by adopting a simple die, the dimensional accuracy is low, the bonding strength of the internal fabric and rubber is insufficient, and the joint part is easy to be a structural weak point. The lack of a precise split mold design and manufacturing process for complex sections and oversized rings results in poor product consistency and unstable sealing performance. (3) The verification system is not systematic and insufficient, the performance verification of the existing product stays in the conventional physical performance test, and the systematic and sequential test verification for simulating the extreme design reference accident conditions of the whole design life cycle (including heat aging, irradiation aging, mechanical fatigue aging) and LOCA, MSLB and the like is lacking. The long-term service performance and reliability of the product in the actual nuclear environment lack data support and standardized assessment basis. (4) The standardization and engineering degree is low, and the lack of a set of complete, tight and executable technical specification, manufacturing process rules and test outline leads to uneven quality of domestic products, and cannot realize batch stable production and engineering application. Therefore, there is a need in the art for an inflatable sealing ring that can be fully innovated from structural design, material system, manufacturing process to verification standards to ensure a reliable seal over a long period of time in the extreme environment of a nuclear power plant. Disclosure of Invention The application provides a high-temperature irradiation resistant inflatable sealing ring for a nuclear power station equipment gate and a preparation method thereof, and aims to solve the problems of imperfect material system, rough structural design and process, and insufficient verification system. The high-temperature irradiation resistant inflatable sealing ring for the nuclear power station equipment gate comprises an integrated hollow inflatable annular sealing body, wherein the sealing body is sequentially compounded with an ethylene propylene diene monomer rubber outer layer, a nylon fiber woven reinforcing layer and a low-gas permeation rubber inner layer from outside to inside, and the nylon fiber woven reinforcing layer is of a continuous and jointless integral woven structure and is adhered with the ethylene propylene diene monomer rubber outer layer and the low-gas permeation rubber inner layer into a whole through an adhesive. Optionally, the adhesive comprises kemlock 238, and the 180 ° peel strength between the nylon fiber braid reinforcement layer and the ethylene propylene diene monomer outer layer is not less than 4.5N/mm. Optionally, the ethylene propylene diene monomer outer layer is configured to provide environmental aging and wear protection, the nylon fiber braided reinforcement layer is configured to withstand internal inflation pressures and provide structural support, and the low gas permeation rubber inner layer is configured to block outward permeation of inflation media. Optionally, the material of the ethylene propylene diene monomer outer layer can bear accumulated dose not lower thanAnd (5) radiation irradiation. Alternatively, the cumulative dose is experienced asAfter radiation, the compression set (150 ℃ multiplied by 24 h) of the ethylene p