A high temperature resistant metal sealing gasket processing technology

Abstract

The present invention relates to a high temperature resistant metal sealing gasket processing technology, comprising the following steps: step 1, pre-treating a metal gasket substrate; step 2, coating the prepared high temperature resistant rubber coating on the surface of the pre-treated metal gasket substrate; step 3, placing the coated metal gasket substrate in a vulcanization device for vulcanization treatment, and then drying and cooling. The present invention prepares a high temperature resistant metal sealing gasket, using a gasket made of a metal material as a substrate, and then coating a layer of high temperature resistant rubber coating on its surface, so that it can have a certain plasticity under the condition of having a high strength, and can fit the microscopic unevenness on the sealing surface to ensure the effectiveness of the seal.

Description

Technical Field

[0001] The invention relates to the field of metal gaskets, and in particular to a processing technology for high-temperature resistant metal sealing gaskets. Background Art

[0002] Sealing gaskets occupy a very important position in modern industrial enterprises. The quality of sealing is directly related to the continuity of production, the safety of property, energy conservation and environmental protection, and people's physical and mental health. Therefore, the development of gaskets has attracted more and more attention. With the rise of modern industry, especially the modern petroleum, chemical industry, atomic energy industry, and large-scale power stations, pressure vessels are developing in the direction of high temperature, high pressure, high vacuum, deep cold, large-scale, and multi-series, and new requirements are constantly put forward for gasket sealing. The principle of sealing gaskets is to compress the sealing gaskets by external force, so that they undergo elastic or plastic deformation to fill the microscopic unevenness on the sealing surface. Sealing gaskets are made of metal or non-metallic plate materials through cutting, stamping or cutting processes. They are used for sealing connections between pipelines and between parts of machinery and equipment.

[0003] In the prior art, metal sealing gaskets are very difficult to plastically form due to the influence of complex cross-sectional features, diversity of sealing structures, and limitations of the plasticity and elongation of the material itself, and are prone to material cracking, instability and wrinkling, and poor forming stability. Rubber gaskets have good plasticity, but traditional rubber has poor high temperature resistance and has poor durability when exposed to high temperature, high frequency, irregular vibration for a long time. Therefore, there is a need for a metal sealing gasket that is resistant to high temperatures and has certain plasticity. Summary of the invention

[0004] In view of the problems existing in the prior art, the object of the present invention is to provide a high temperature resistant metal sealing gasket processing technology.

[0005] The purpose of the present invention is achieved by the following technical solutions:

[0006] A high temperature resistant metal sealing gasket processing technology comprises the following steps:

[0007] Step 1, cleaning the surface of the metal gasket substrate prefabricated by the mold, and then drying it to obtain a pretreated metal gasket substrate;

[0008] Step 2, coating the prepared high temperature resistant rubber coating on the surface of the pretreated metal gasket substrate to obtain a metal gasket substrate coated with the coating;

[0009] Step 3, placing the metal gasket substrate coated with the coating in a vulcanization device for vulcanization treatment, and then drying and cooling to obtain a high-temperature resistant metal sealing gasket.

[0010] Preferably, in step 1, the material of the metal gasket substrate is stainless steel.

[0011] Preferably, in step 2, the coating thickness is 0.01-0.05 mm.

[0012] Preferably, in step 3, the temperature of the vulcanization treatment is 180-200° C., and the vulcanization time is 1.5-2 h.

[0013] Preferably, the high temperature resistant rubber coating comprises, calculated by weight:

[0014] 70-90 parts of fluororubber resin, 8-15 parts of filler modifier, 0.5-1.5 parts of antioxidant, 0.8-1.6 parts of dispersant, 0.2-0.7 parts of defoamer, 1-2 parts of vulcanizing agent, 1.8-2.4 parts of vulcanization accelerator and 150-200 parts of solvent.

[0015] Preferably, the fluororubber resin is a mixture of one or more of fluororubber 23, fluororubber 26, and fluororubber 246. More preferably, it is fluororubber 26 (fluororubber raw rubber, grade FKM-26M, Shandong Dongyue Shenzhou New Materials Co., Ltd.).

[0016] Preferably, the antioxidant is a mixture of one or more of antioxidant RD, antioxidant MB, antioxidant ODA and antioxidant SP.

[0017] Preferably, the dispersant is TR-40F or TR-202.

[0018] Preferably, the defoamer is a mixture of one or more of BYK-065, BYK-057, BYK-063, and BYK-066N.

[0019] Preferably, the vulcanizing agent is bisphenol AF or bisphenol S. More preferably, it is bisphenol AF.

[0020] Preferably, the vulcanization accelerator is a mixture of one or more of the vulcanization accelerator CDD, the vulcanization accelerator DTDM, and the vulcanization accelerator BTPPC, and more preferably the vulcanization accelerator BTPPC.

[0021] Preferably, the solvent is a mixture of one or more of ethyl acetate, ethyl benzoate and diethyl carbonate.

[0022] Preferably, the preparation method of the filling modifier comprises:

[0023] S1. Weigh zirconium nitride nanopowder and graphene oxide, mix them in deionized water, add coupling agent KH-792 dropwise, treat under the action of ultrasound, and after the treatment, collect the solid by centrifugation and vacuum dry to obtain amino zirconium nitride / graphene composite powder;

[0024] S2, adding pyrazine-2,3-dicarboxylic acid to thionyl chloride, using nitrogen as a protective gas, heating to 80-85°C, reflux with stirring for 5-7h, and after the reaction is completed, removing the solvent by rotary evaporation to obtain pyrazine-2,3-diacyl chloride;

[0025] S3. Mix the amino zirconium nitride / graphene composite powder and ethyl acetate, then add triethylamine dropwise, stir evenly in an ice-water bath, use nitrogen as a protective gas, gradually add pyrazine-2,3-diacid chloride, and after complete addition, remove the ice-water bath, stir at room temperature for 8-12 hours. After the reaction is completed, remove the solvent by rotary evaporation, then wash the solid product with anhydrous ethanol for at least three times, and vacuum dry to obtain a filling modifier.

[0026] Preferably, in S1, the particle size range of zirconium nitride nanopowder and graphene oxide is 200-500 nm.

[0027] Preferably, in S1, the mass volume ratio of zirconium nitride nanopowder, graphene oxide, coupling agent KH-792 and deionized water is (0.8-1.6) g: (0.2-0.6) g: (0.1-0.3) g: (10-20) mL.

[0028] Preferably, in S1, the ultrasonic conditions are: ultrasonic power is 60-100W, and ultrasonic time is 2-5h.

[0029] Preferably, in S2, the mass volume ratio of pyrazine-2,3-dicarboxylic acid and thionyl chloride is (1.7-3.4) g: (10-20) mL.

[0030] Preferably, in S3, the mass volume ratio of the amino zirconium nitride / graphene composite powder, pyrazine-2,3-diacyl chloride, triethylamine and ethyl acetate is 1 g:(0.6-1.2) g:(0.02-0.05) g:(10-20) mL.

[0031] The beneficial effects of the present invention are:

[0032] 1. The present invention prepares a high-temperature resistant metal sealing gasket, which adopts a metal gasket as a substrate and then coats a layer of high-temperature resistant rubber coating on its surface, so that it can have a certain plasticity under the condition of high strength and can fit the microscopic unevenness on the sealing surface to ensure the effectiveness of the seal.

[0033] 2. The main raw material of the high temperature resistant rubber coating used in the present invention is fluororubber with excellent high temperature resistance and corrosion resistance. In addition, the present invention also adds a filling modifier to replace the traditional filler. The filling modifier uses zirconium nitride / graphene composite powder as the base material, which is prepared by combining it with pyrazine-2,3-diacid chloride after amino treatment. The prepared filling modifier can be applied to fluororubber, and has a good improvement on the elasticity, adhesion, sealing and high temperature resistance of the material.

[0034] 3. The filling modifier prepared by the present invention adopts a composite nanopowder formed by mixing zirconium nitride and graphene as a base material, and then uses an aminosilane coupling agent for amination treatment to obtain an amination zirconium nitride / graphene composite powder; and the pyrazine-2,3-diacid chloride used is prepared by chlorinating pyrazine-2,3-dicarboxylic acid; the amination zirconium nitride / graphene composite powder and pyrazine-2,3-dicarboxylic acid chloride are reacted through amide reaction to prepare an organic-coated inorganic material, wherein the organic coating layer contains a large amount of pyrazine and amide groups, which not only makes the compatibility with rubber better, but also improves the performance of the rubber to a certain extent. DETAILED DESCRIPTION

[0035] The technical solution of the present invention is described below through specific examples. It should be understood that the one or more method steps mentioned in the present invention do not exclude the existence of other method steps before and after the combination step or the insertion of other method steps between these explicitly mentioned steps; it should also be understood that these embodiments are only used to illustrate the present invention and are not used to limit the scope of the present invention. Moreover, unless otherwise specified, the numbering of each method step is only a convenient tool for identifying each method step, and is not intended to limit the order of arrangement of each method step or to limit the scope of the present invention. The change or adjustment of the relative relationship thereof shall also be regarded as the scope of the present invention without substantially changing the technical content.

[0036] In order to better understand the above technical scheme, the exemplary embodiments of the present invention are described in more detail below. Although exemplary embodiments of the present invention are shown, it should be understood that the present invention can be implemented in various forms and should not be limited by the embodiments set forth herein. On the contrary, these embodiments are provided in order to enable a more thorough understanding of the present invention and to enable the scope of the present invention to be fully communicated to those skilled in the art.

[0037] The present invention will be further described below in conjunction with the following examples. Example 1

[0038] A high temperature resistant metal sealing gasket processing technology comprises the following steps:

[0039] Step 1, cleaning the surface of the SUS304 gasket substrate prefabricated by the mold, and then drying it to obtain a pretreated metal gasket substrate;

[0040] Step 2, coating the prepared high temperature resistant rubber coating on the surface of the pretreated metal gasket substrate, with a coating thickness of 0.03 mm, to obtain a metal gasket substrate coated with the coating;

[0041] Step 3, placing the metal gasket substrate coated with the coating in a vulcanization device for vulcanization treatment at a temperature of 190° C. for 1.8 hours, and then drying and cooling to obtain a high-temperature resistant metal sealing gasket.

[0042] High temperature resistant rubber coatings are calculated by weight and include:

[0043] 80 parts of fluororubber resin, 12 parts of filler modifier, 1 part of antioxidant, 1.2 parts of dispersant, 0.5 parts of defoamer, 1.5 parts of vulcanizing agent, 2.1 parts of vulcanization accelerator and 180 parts of solvent.

[0044] Among them, the model of fluororubber resin is fluororubber 26, fluororubber raw rubber, brand FKM-26M, Shandong Dongyue Shenzhou New Materials Co., Ltd.; the antioxidant is antioxidant RD; the dispersant is TR-40F; the defoaming agent is BYK-065; the vulcanizing agent is bisphenol AF; the vulcanization accelerator is vulcanization accelerator BTPPC; the solvent is ethyl acetate.

[0045] The preparation method of the filling modifier comprises:

[0046] S1. Weigh 200-500nm zirconium nitride nanopowder and 200-500nm graphene oxide, mix them in deionized water, add coupling agent KH-792 dropwise, the mass volume ratio of zirconium nitride nanopowder, graphene oxide, coupling agent KH-792 and deionized water is 1.2g:0.4g:0.2g:15mL, treat under 80W ultrasound for 3h, after the treatment, collect the solid by centrifugation, and vacuum dry to obtain amino zirconium nitride / graphene composite powder;

[0047] S2, adding pyrazine-2,3-dicarboxylic acid to thionyl chloride, the mass volume ratio of pyrazine-2,3-dicarboxylic acid to thionyl chloride is 2.5 g:15 mL, nitrogen is used as a protective gas, the temperature is raised to 80° C., refluxed and stirred for 6 hours, and after the reaction is completed, the solvent is removed by rotary evaporation to obtain pyrazine-2,3-diacyl chloride;

[0048] S3. Mix the aminated zirconium nitride / graphene composite powder and ethyl acetate, then add triethylamine dropwise, stir evenly in an ice-water bath, use nitrogen as a protective gas, gradually add pyrazine-2,3-diacid chloride, the mass volume ratio of aminated zirconium nitride / graphene composite powder, pyrazine-2,3-diacid chloride, triethylamine and ethyl acetate is 1g:0.9g:0.03g:15mL. After complete addition, remove the ice-water bath, stir at room temperature for 10h, after the reaction is completed, remove the solvent by rotary evaporation, then wash the solid product with anhydrous ethanol for at least three times, and vacuum dry to obtain a filling modifier. Example 2

[0049] A high temperature resistant metal sealing gasket processing technology comprises the following steps:

[0050] Step 1, cleaning the surface of the SUS316 gasket substrate prefabricated by the mold, and then drying it to obtain a pretreated metal gasket substrate;

[0051] Step 2, coating the prepared high temperature resistant rubber coating on the surface of the pretreated metal gasket substrate, with a coating thickness of 0.01 mm, to obtain a metal gasket substrate coated with the coating;

[0052] Step 3, placing the metal gasket substrate coated with the coating in a vulcanization device for vulcanization treatment at a temperature of 200° C. for 1.5 hours, and then drying and cooling to obtain a high-temperature resistant metal sealing gasket.

[0053] High temperature resistant rubber coatings are calculated by weight and include:

[0054] 70 parts of fluororubber resin, 8 parts of filler modifier, 0.5 parts of antioxidant, 0.8 parts of dispersant, 0.2 parts of defoamer, 1 part of vulcanizing agent, 1.8 parts of vulcanization accelerator and 150 parts of solvent.

[0055] Among them, the model of fluororubber resin is fluororubber 23; the antioxidant is antioxidant MB; the dispersant is TR-202; the defoaming agent is BYK-057; the vulcanizing agent is bisphenol S; the vulcanization accelerator is vulcanization accelerator CDD; and the solvent is ethyl benzoate.

[0056] The preparation method of the filling modifier comprises:

[0057] S1. Weigh 200-500nm zirconium nitride nanopowder and 200-500nm graphene oxide, mix them in deionized water, add coupling agent KH-792 dropwise, the mass volume ratio of zirconium nitride nanopowder, graphene oxide, coupling agent KH-792 and deionized water is 0.8g:0.2g:0.1g:10mL, treat under 60W ultrasound for 2h, after the treatment, collect the solid by centrifugation, and vacuum dry to obtain amino zirconium nitride / graphene composite powder;

[0058] S2, adding pyrazine-2,3-dicarboxylic acid to thionyl chloride, the mass volume ratio of pyrazine-2,3-dicarboxylic acid to thionyl chloride is 1.7 g:10 mL, nitrogen is used as a protective gas, the temperature is raised to 80° C., refluxed and stirred for 5 h, and after the reaction is completed, the solvent is removed by rotary evaporation to obtain pyrazine-2,3-diacyl chloride;

[0059] S3. Mix the aminated zirconium nitride / graphene composite powder and ethyl acetate, then add triethylamine dropwise, stir evenly in an ice-water bath, use nitrogen as a protective gas, gradually add pyrazine-2,3-diacid chloride, the mass volume ratio of aminated zirconium nitride / graphene composite powder, pyrazine-2,3-diacid chloride, triethylamine and ethyl acetate is 1g:0.6g:0.02g:10mL. After complete addition, remove the ice-water bath, stir at room temperature for 8h, after the reaction is completed, remove the solvent by rotary evaporation, then wash the solid product with anhydrous ethanol for at least three times, and vacuum dry to obtain a filling modifier. Example 3

[0060] A high temperature resistant metal sealing gasket processing technology comprises the following steps:

[0061] Step 1, cleaning the surface of the SUS321 gasket substrate prefabricated by the mold, and then drying it to obtain a pretreated metal gasket substrate;

[0062] Step 2, coating the prepared high temperature resistant rubber coating on the surface of the pretreated metal gasket substrate, with a coating thickness of 0.05 mm, to obtain a metal gasket substrate coated with the coating;

[0063] Step 3, placing the metal gasket substrate coated with the coating in a vulcanization device for vulcanization treatment at a temperature of 180° C. for 2 hours, and then drying and cooling to obtain a high-temperature resistant metal sealing gasket.

[0064] High temperature resistant rubber coatings are calculated by weight and include:

[0065] 90 parts of fluororubber resin, 15 parts of filler modifier, 1.5 parts of antioxidant, 1.6 parts of dispersant, 0.7 parts of defoamer, 2 parts of vulcanizing agent, 2.4 parts of vulcanization accelerator and 200 parts of solvent.

[0066] Among them, the model of fluororubber resin is fluororubber 246; the antioxidant is antioxidant ODA; the dispersant is TR-40F; the defoaming agent is BYK-066N; the vulcanizing agent is bisphenol AF; the vulcanization accelerator is vulcanization accelerator DTDM; and the solvent is diethyl carbonate.

[0067] The preparation method of the filling modifier comprises:

[0068] S1. Weigh 200-500nm zirconium nitride nanopowder and 200-500nm graphene oxide, mix them in deionized water, add coupling agent KH-792 dropwise, the mass volume ratio of zirconium nitride nanopowder, graphene oxide, coupling agent KH-792 and deionized water is 1.6g:0.6g:0.3g:20mL, treat under 100W ultrasound for 5h, after the treatment, collect the solid by centrifugation, and vacuum dry to obtain amino zirconium nitride / graphene composite powder;

[0069] S2, adding pyrazine-2,3-dicarboxylic acid to thionyl chloride, the mass volume ratio of pyrazine-2,3-dicarboxylic acid to thionyl chloride is 3.4 g:20 mL, nitrogen is used as a protective gas, the temperature is raised to 85° C., refluxed and stirred for 7 hours, and after the reaction is completed, the solvent is removed by rotary evaporation to obtain pyrazine-2,3-diacyl chloride;

[0070] S3. Mix the amino zirconium nitride / graphene composite powder and ethyl acetate, then add triethylamine dropwise, stir evenly in an ice-water bath, use nitrogen as a protective gas, gradually add pyrazine-2,3-diacid chloride, the mass volume ratio of amino zirconium nitride / graphene composite powder, pyrazine-2,3-diacid chloride, triethylamine and ethyl acetate is 1g:1.2g:0.05g:20mL. After complete addition, remove the ice-water bath, stir at room temperature for 12h, after the reaction is completed, remove the solvent by rotary evaporation, then wash the solid product with anhydrous ethanol for at least three times, and vacuum dry to obtain a filling modifier.

[0071] Comparative Example 1

[0072] A high temperature resistant metal sealing gasket processing process, which differs from Example 1 in that the composition of the high temperature resistant rubber coating is slightly different, the filling modifier in the high temperature resistant rubber coating is replaced by zirconium nitride / graphene composite powder, and the other ingredients are the same.

[0073] High temperature resistant rubber coatings are calculated by weight and include:

[0074] 80 parts of fluororubber resin, 12 parts of zirconium nitride / graphene composite powder, 1 part of antioxidant, 1.2 parts of dispersant, 0.5 parts of defoaming agent, 1.5 parts of vulcanizing agent, 2.1 parts of vulcanization accelerator and 180 parts of solvent.

[0075] The preparation method of zirconium nitride / graphene composite powder is as follows:

[0076] Weigh 200-500nm zirconium nitride nanopowder and 200-500nm graphene oxide and mix them in deionized water, the mass volume ratio of zirconium nitride nanopowder, graphene oxide and deionized water is 1.2g:0.4g:15mL, treat under 80W ultrasound for 3h, after the treatment, collect the solid by centrifugation, and vacuum dry to obtain zirconium nitride / graphene composite powder.

[0077] Comparative Example 2

[0078] A high-temperature resistant metal sealing gasket processing process, which differs from Example 1 in that the composition of the high-temperature resistant rubber coating is slightly different, and the filling modifier in the high-temperature resistant rubber coating is replaced by amino zirconium nitride / graphene composite powder. The preparation of the amino zirconium nitride / graphene composite powder is the same as that in Example 1, and the other components are the same.

[0079] High temperature resistant rubber coatings are calculated by weight and include:

[0080] 80 parts of fluororubber resin, 12 parts of amino zirconium nitride / graphene composite powder, 1 part of antioxidant, 1.2 parts of dispersant, 0.5 parts of defoaming agent, 1.5 parts of vulcanizing agent, 2.1 parts of vulcanization accelerator and 180 parts of solvent.

[0081] Comparative Example 3

[0082] A high-temperature resistant metal sealing gasket processing process, which differs from Example 1 in that the composition of the high-temperature resistant rubber coating is slightly different, and the filling modifier in the high-temperature resistant rubber coating is replaced by a mixture of zirconium nitride / graphene composite powder and pyrazine-2,3-dicarboxylic acid, the mass ratio of the mixture of zirconium nitride / graphene composite powder and pyrazine-2,3-dicarboxylic acid is 1:0.9, the preparation of zirconium nitride / graphene composite powder is the same as that in Comparative Example 1, and the other components are the same.

[0083] High temperature resistant rubber coatings are calculated by weight and include:

[0084] 80 parts of fluororubber resin, 12 parts of a mixture of zirconium nitride / graphene composite powder and pyrazine-2,3-dicarboxylic acid, 1 part of an antioxidant, 1.2 parts of a dispersant, 0.5 parts of a defoaming agent, 1.5 parts of a vulcanizing agent, 2.1 parts of a vulcanization accelerator and 180 parts of a solvent.

[0085] Experimental testing

[0086] The properties of the high temperature resistant rubber coatings prepared in Example 1 and Comparative Examples 1-3 were tested. The compression rate and rebound rate were tested according to the reference standard ASTM F36-15; the sealing performance was tested according to the reference standard ASTM F37-00 (self-stress 20MPa, gas is nitrogen, nitrogen pressure 0.2MPa); the high temperature resistance was tested in an oven at 320°C for 5h, and then the color difference and cracking of the coating surface were observed; the adhesion was tested by the cross-hatch method, referring to GB / T 9286-1998. The test results are shown in Table 1:

[0087] Table 1 Performance of different high temperature resistant rubber coatings

[0088] Example 1 Comparative Example 1 Comparative Example 2 Comparative Example 3 Compression ratio (%) 3 2 2 3 Rebound rate (%) 38 31 32 35 Sealing performance (mL / hr) 0.7 1.3 1.0 1.2 High temperature resistance (320℃*5h) No discoloration, no cracking Slight discoloration, slight cracking Slight discoloration, slight cracking Slight discoloration, no cracking Adhesion (grade) 0 1 1 1

[0089] It can be seen from Table 1 that the high temperature resistant rubber coating prepared in Example 1 of the present invention not only has better elasticity, but also has better sealing, high temperature resistance and adhesion, which is better than the existing comparative example. This shows that the high temperature resistant rubber coating prepared in the present invention has good surface bonding with the gasket substrate, can be used at higher temperatures, and has better sealing effect.

[0090] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representation of the above terms should not be understood as necessarily being directed to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art may combine and combine different embodiments or examples described in this specification.

[0091] Although the embodiments of the present invention have been shown and described above, it is to be understood that the above embodiments are exemplary and are not to be construed as limitations of the present invention. A person skilled in the art may change, modify, replace and vary the above embodiments within the scope of the present invention.

Claims

1. A high temperature resistant metal sealing gasket processing technology, characterized in that: The following steps are involved: Step 1, cleaning the surface of the metal gasket substrate prefabricated by the mold, and then drying it to obtain a pretreated metal gasket substrate; Step 2, coating the prepared high temperature resistant rubber coating on the surface of the pretreated metal gasket substrate to obtain a metal gasket substrate coated with the coating; Step 3, placing the metal gasket substrate coated with the coating in a vulcanization device for vulcanization treatment, and then drying and cooling to obtain a high temperature resistant metal sealing gasket; Wherein, the high temperature resistant rubber coating is calculated by weight and includes: 70-90 parts of fluororubber resin, 8-15 parts of filler modifier, 0.5-1.5 parts of antioxidant, 0.8-1.6 parts of dispersant, 0.2-0.7 parts of defoamer, 1-2 parts of vulcanizing agent, 1.8-2.4 parts of vulcanization accelerator and 150-200 parts of solvent; The preparation method of the filling modifier comprises: S1. Weigh zirconium nitride nanopowder and graphene oxide, mix them in deionized water, add coupling agent KH-792 dropwise, treat under the action of ultrasound, and after the treatment, collect the solid by centrifugation and vacuum dry to obtain amino zirconium nitride / graphene composite powder; S2, adding pyrazine-2,3-dicarboxylic acid to thionyl chloride, using nitrogen as a protective gas, heating to 80-85°C, reflux with stirring for 5-7h, and after the reaction is completed, removing the solvent by rotary evaporation to obtain pyrazine-2,3-diacyl chloride; S3. Mix the amino zirconium nitride / graphene composite powder and ethyl acetate, then add triethylamine dropwise, stir evenly in an ice-water bath, use nitrogen as a protective gas, gradually add pyrazine-2,3-diacid chloride, and after complete addition, remove the ice-water bath, stir at room temperature for 8-12 hours. After the reaction is completed, remove the solvent by rotary evaporation, then wash the solid product with anhydrous ethanol for at least three times, and vacuum dry to obtain a filling modifier.

2. A high temperature resistant metal sealing gasket processing technology according to claim 1, characterized in that: The type of the fluororubber resin is a mixture of one or more of fluororubber 23, fluororubber 26, and fluororubber 246.

3. A high temperature resistant metal sealing gasket processing technology according to claim 1, characterized in that: The antioxidant is a mixture of one or more of antioxidant RD, antioxidant MB, antioxidant ODA and antioxidant SP.

4. A high temperature resistant metal sealing gasket processing technology according to claim 1, characterized in that: The solvent is a mixture of one or more of ethyl acetate, ethyl benzoate and diethyl carbonate.

5. The high temperature resistant metal sealing gasket processing technology according to claim 1 is characterized in that: The dispersant is TR-40F or TR-202; the defoamer is a mixture of one or more of BYK-065, BYK-057, BYK-063 and BYK-066N.

6. A high temperature resistant metal sealing gasket processing technology according to claim 1, characterized in that: The vulcanizing agent is bisphenol AF or bisphenol S; the vulcanization accelerator is a mixture of one or more of vulcanization accelerator CDD, vulcanization accelerator DTDM and vulcanization accelerator BTPPC.

7. The high temperature resistant metal sealing gasket processing technology according to claim 1 is characterized in that: In the S1, the mass volume ratio of zirconium nitride nanopowder, graphene oxide, coupling agent KH-792 and deionized water is (0.8-1.6) g: (0.2-0.6) g: (0.1-0.3) g: (10-20) mL.

8. The high temperature resistant metal sealing gasket processing technology according to claim 1 is characterized in that: In S2, the mass volume ratio of pyrazine-2,3-dicarboxylic acid and thionyl chloride is (1.7-3.4) g: (10-20) mL.

9. The high temperature resistant metal sealing gasket processing technology according to claim 1, characterized in that: In S3, the mass volume ratio of the amino zirconium nitride / graphene composite powder, pyrazine-2,3-diacid chloride, triethylamine and ethyl acetate is 1 g: (0.6-1.2) g: (0.02-0.05) g: (10-20) mL.