CN111073183A - Manufacturing process of high-fluorine-content rubber sealing plate - Google Patents
Manufacturing process of high-fluorine-content rubber sealing plate Download PDFInfo
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- CN111073183A CN111073183A CN201911105256.8A CN201911105256A CN111073183A CN 111073183 A CN111073183 A CN 111073183A CN 201911105256 A CN201911105256 A CN 201911105256A CN 111073183 A CN111073183 A CN 111073183A
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
- C08J5/00—Manufacture of articles or shaped materials containing macromolecular substances
- C08J5/18—Manufacture of films or sheets
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C35/00—Heating, cooling or curing, e.g. crosslinking or vulcanising; Apparatus therefor
- B29C35/02—Heating or curing, e.g. crosslinking or vulcanizing during moulding, e.g. in a mould
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C43/00—Compression moulding, i.e. applying external pressure to flow the moulding material; Apparatus therefor
- B29C43/32—Component parts, details or accessories; Auxiliary operations
- B29C43/58—Measuring, controlling or regulating
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C43/00—Compression moulding, i.e. applying external pressure to flow the moulding material; Apparatus therefor
- B29C43/32—Component parts, details or accessories; Auxiliary operations
- B29C43/58—Measuring, controlling or regulating
- B29C2043/5816—Measuring, controlling or regulating temperature
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29L—INDEXING SCHEME ASSOCIATED WITH SUBCLASS B29C, RELATING TO PARTICULAR ARTICLES
- B29L2007/00—Flat articles, e.g. films or sheets
- B29L2007/002—Panels; Plates; Sheets
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
- C08J2327/00—Characterised by the use of homopolymers or copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and at least one being terminated by a halogen; Derivatives of such polymers
- C08J2327/02—Characterised by the use of homopolymers or copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and at least one being terminated by a halogen; Derivatives of such polymers not modified by chemical after-treatment
- C08J2327/12—Characterised by the use of homopolymers or copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and at least one being terminated by a halogen; Derivatives of such polymers not modified by chemical after-treatment containing fluorine atoms
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
- C08J2461/00—Characterised by the use of condensation polymers of aldehydes or ketones; Derivatives of such polymers
- C08J2461/04—Condensation polymers of aldehydes or ketones with phenols only
- C08J2461/06—Condensation polymers of aldehydes or ketones with phenols only of aldehydes with phenols
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
- C08J2477/00—Characterised by the use of polyamides obtained by reactions forming a carboxylic amide link in the main chain; Derivatives of such polymers
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
- C08K13/00—Use of mixtures of ingredients not covered by one single of the preceding main groups, each of these compounds being essential
- C08K13/04—Ingredients characterised by their shape and organic or inorganic ingredients
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
- C08K3/00—Use of inorganic substances as compounding ingredients
- C08K3/18—Oxygen-containing compounds, e.g. metal carbonyls
- C08K3/20—Oxides; Hydroxides
- C08K3/22—Oxides; Hydroxides of metals
- C08K2003/2217—Oxides; Hydroxides of metals of magnesium
- C08K2003/222—Magnesia, i.e. magnesium oxide
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
- C08K3/00—Use of inorganic substances as compounding ingredients
- C08K3/34—Silicon-containing compounds
- C08K3/346—Clay
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
- C08K7/00—Use of ingredients characterised by shape
- C08K7/02—Fibres or whiskers
- C08K7/04—Fibres or whiskers inorganic
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
- C08K7/00—Use of ingredients characterised by shape
- C08K7/22—Expanded, porous or hollow particles
- C08K7/24—Expanded, porous or hollow particles inorganic
- C08K7/26—Silicon- containing compounds
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Abstract
The invention discloses a manufacturing process of a high fluorine-containing rubber sealing plate, which comprises the steps of opening, rubber foaming, material mixing, tensioning and vulcanizing, so that the manufactured sealing plate has good compactness, high tensile strength and excellent sealing property, and is incomparable to asbestos and non-asbestos fiber nitrile rubber sealing materials.
Description
Technical Field
The invention relates to the technical field of sealing material manufacturing processes, in particular to a manufacturing process of a high-fluorine-containing rubber sealing plate.
Background
The sealing plate is a primary material for manufacturing sealing elements such as a sealing gasket, the sealing elements such as the sealing gasket are manufactured by cutting, stamping or cutting and other processes and are used for sealing connection between pipelines, a machine part of machine equipment is in sealing connection with a flange surface between the machine part, the conventional fiber rubber sealing material is prepared by taking asbestos fiber, aramid fiber and ceramic fiber as aggregate, taking kaolin, calcium carbonate and other silicate powder as filler, strongly opening, stirring and mixing, adding sulfur, zinc oxide and other vulcanized rubber vulcanization crosslinking agents, extruding and coating the mixture to a certain thickness by a small cold roller and a large hot roller for forming, taking the nitrile rubber as a sealing material of an adhesive, and the nitrile rubber has low temperature resistance, the highest temperature resistance of pure rubber is 120 ℃, the sealing material modified by mineral fillers such as inorganic fiber and kaolin and the like, and the highest temperature cannot exceed 220 ℃ and simultaneously cannot resist media such as methanol gasoline, the application field is narrow.
Disclosure of Invention
Aiming at the defects of the prior art, the invention provides a manufacturing process of a high-fluorine-containing rubber sealing plate, and the obtained plate can resist high and low temperature materials of-42 to-300 ℃ and can be used for various purposes such as high-temperature lubricating oil, heat conducting oil, high-temperature gas and the like.
In order to solve the technical problems, the invention solves the technical problems by the following technical scheme: a manufacturing process of a high-fluorine-containing rubber sealing plate comprises the following steps:
1) opening: putting auxiliary materials according to a certain proportion into an opener for opening treatment;
2) and (3) soaking the rubber: soaking granular high fluorine-containing rubber with the part ratio of 1:1.8 in a solvent prepared in advance;
3) mixing materials: feeding the auxiliary materials subjected to loosening treatment in the step 1 and the soaked high-fluorine rubber solution in the step 2 into a mixer, carrying out primary stirring, and then adding a solvent for secondary stirring;
4) sheet forming: feeding the mixed materials into a sheet forming machine to obtain a whole sheet of plate, controlling the temperature of a small roller to be 5-10 ℃ and the temperature of a big roller to be 90-120 ℃;
5) and (3) vulcanization: the above panels were pre-baked and sulfur cured.
In the technical scheme, the auxiliary materials comprise, by weight, 3-10 parts of aramid pulp fibers, 5-25 parts of other fibers, 18-25 parts of active white carbon black, 15-21 parts of light calcium, 3-8 parts of magnesium oxide, 10-25 parts of kaolin, 1-5 parts of a cross-linking agent and 2-8 parts of a silane coupling agent.
In the above technical solution, the other fibers include glass fibers or ceramic fibers.
In the above technical scheme, the solvent comprises, in parts by weight, 2: 1, methyl ketone and butyl ester.
In the technical scheme, the primary stirring time is 40-50 minutes.
In the above technical scheme, the number of times of the normal sulfur is two.
In the technical scheme, the baking temperature is 150-160 degrees.
Compared with the prior art, the invention has the following beneficial effects: 100% of high-fluorine rubber replaces nitrile rubber; the rubber content is increased from 10 to 15 percent to 18 to 35 percent; eliminates the processes of rubber refining, sheet pulling and infiltration of the nitrile rubber, eliminates the traditional nitrile rubber vulcanization small materials such as sulfur, zinc oxide, accelerant, anti-aging agent and the like, reduces the cost, fully exerts the micro-elasticity, the tensile capacity, the high strength and the high wear resistance of the collagen fiber, and puncture resistance, strong pressure resistance and the like, and the characteristics that collagen fibers are curled at 65 ℃ and are not deformed after being shaped at 120 ℃ are mainly utilized, so that the obtained high-fluorine fiber sealing plate has good compactness, high tensile strength and excellent sealing property, is incomparable with asbestos and non-asbestos fiber nitrile rubber sealing materials, and the collagen fiber sealing material obtained by the process, can be used for sealing gaskets of pipeline flanges of engines and engineering machinery with the temperature of-42 ℃ to 300 ℃, such as oil, water, pumps, valves and the like, on the premise of improving the performance, the cost can be reduced by 50%, the application range is expanded, and the problem of the use cost of a general user is solved.
Detailed Description
The present invention will be described in further detail with reference to specific embodiments.
Example 1: a manufacturing process of a high-fluorine-containing rubber sealing plate comprises the following steps:
1) opening: putting 3 parts of aramid pulp fiber, 5 parts of glass fiber, 18 parts of active white carbon black, 15 parts of light calcium, 3 parts of magnesium oxide, 10 parts of kaolin, 1 part of cross-linking agent and 2 parts of silane coupling agent in parts into an opener with a high-speed fly cutter for dispersion;
2) and (3) soaking the rubber: 1 part of granular high fluorine-containing rubber is soaked in 1.8 parts of solvent prepared in advance, the solvent is prepared by blending 2 parts of ketone and 1 part of butyl ester, and the soaking is beneficial to increasing the self-dispersing performance of the rubber and the uniform combination of a subsequent process and other materials;
3) mixing materials: adding the crushed auxiliary materials into a mixer, adding the soaked high-fluorine rubber glue, stirring and pulling the glue in the mixer for one time until no rubber particles exist, controlling the glue pulling time to be 40-50 minutes, gradually adding phenolic resin, stirring until no hard block, no spot and enough oil content exist in visual hand feeling, and stopping the mixer for discharging.
4) Sheet forming: feeding the mixed materials into a sheet forming machine to obtain a whole sheet of plate, controlling the temperature of a small roller to be 5-10 ℃ and the temperature of a big roller to be 90-120 ℃, feeding the materials firstly and then feeding the big materials according to the program, after all the quantitative materials are added, carrying out back pressure for two to three turns, stopping the machine, cutting the whole sheet of plate, opening the whole sheet of plate to form a large roller, and pulling out the whole sheet of plate;
5) and (3) vulcanization: and (3) pre-drying once at 150-160 ℃, and then performing sulfur treatment twice to obtain the plate meeting the performance index.
Example 2:
a manufacturing process of a high-fluorine-containing rubber sealing plate comprises the following steps:
1) opening: putting 6 parts of aramid pulp fiber, 13 parts of ceramic fiber, 20 parts of active white carbon black, 17 parts of light calcium, 5 parts of magnesium oxide, 18 parts of kaolin, 3 parts of cross-linking agent and 6 parts of silane coupling agent in parts into an opener with a high-speed fly cutter for dispersion;
2) and (3) soaking the rubber: soaking granular high fluorine-containing rubber in 1 part by weight in a pre-prepared 1.8 parts of solvent prepared by blending 2 parts of ketone and 1 part of butyl ester;
3) mixing materials: adding the crushed auxiliary materials into a mixer, adding the soaked high-fluorine rubber glue, stirring and pulling the glue in the mixer for one time until no rubber particles exist, controlling the glue pulling time to be 40-50 minutes, gradually adding phenolic resin, stirring until no hard block, no spot and enough oil content exist in visual hand feeling, and stopping the mixer for discharging.
4) Sheet forming: feeding the mixed materials into a sheet forming machine to obtain a whole sheet of plate, controlling the temperature of a small roller to be 5-10 ℃ and the temperature of a big roller to be 90-120 ℃, feeding the materials firstly and then feeding the big materials according to the program, after all the quantitative materials are added, carrying out back pressure for two to three turns, stopping the machine, cutting the whole sheet of plate, opening the whole sheet of plate to form a large roller, and pulling out the whole sheet of plate;
5) and (3) vulcanization: and (3) pre-drying once at 150-160 ℃, and then performing sulfur treatment twice to obtain the plate meeting the performance index.
Example 3:
a manufacturing process of a high-fluorine-containing rubber sealing plate comprises the following steps:
1) opening: putting 10 parts of aramid pulp fiber, 25 parts of ceramic fiber, 25 parts of active white carbon black, 21 parts of light calcium, 8 parts of magnesium oxide, 25 parts of kaolin, 5 parts of cross-linking agent and 8 parts of silane coupling agent in parts into an opener with a high-speed fly cutter for dispersion;
2) and (3) soaking the rubber: soaking granular high fluorine-containing rubber in 1 part by weight in a pre-prepared 1.8 parts of solvent prepared by blending 2 parts of ketone and 1 part of butyl ester;
3) mixing materials: adding the crushed auxiliary materials into a mixer, adding the soaked high-fluorine rubber glue, stirring and pulling the glue in the mixer for one time until no rubber particles exist, controlling the glue pulling time to be 40-50 minutes, gradually adding phenolic resin, stirring until no hard block or spot exists in visual hand feeling, and stopping the mixer for discharging when the oil content is sufficient.
4) Sheet forming: feeding the mixed materials into a sheet forming machine to obtain a whole sheet of plate, controlling the temperature of a small roller to be 5-10 ℃ and the temperature of a big roller to be 90-120 ℃, feeding the materials firstly and then feeding the big materials according to the program, after all the quantitative materials are added, carrying out back pressure for two to three turns, stopping the machine, cutting the whole sheet of plate, opening the whole sheet of plate to form a large roller, and pulling out the whole sheet of plate;
5) and (3) vulcanization: and (3) pre-drying once at 150-160 ℃, and performing sulfur treatment twice to obtain the plate meeting the performance index.
The performance test of the sealing gasket plate obtained by the processes in the embodiments has the following indexes:
1. and (3) performance testing:
2. and (3) immersion liquid testing:
3. relaxation Rate test
| 100 degree 22 hours | 23.6％ |
| 220 ℃ for 22 hours | 31.1％ |
4. Aging test
| 280 ℃ for 18 hours | No obvious hardening was observed |
| 300 ℃ for 18 hours | Slightly hardened |
The tests can be controlled, the sealing plate of the invention can be used for sealing high-temperature lubricating oil, heat conducting oil, high-temperature gas, methanol gasoline engine, methyl alcohol, ethanol and other industrial pipeline flange valves and the like at minus 42 ℃ to 300 ℃ because of the traditional sealing material, solves the problem that the sealing material using nitrile rubber as adhesive is not resistant to the performance of low temperature of-42 ℃ and high temperature of 300 ℃, is completely different from O-shaped rings and pure rubber flat plate materials of pure fluororubber, and does not belong to polytetrafluoroethylene plastic sealing sheets.
It is made up by using vinylidene fluoride, tetrafluoroethylene, perfluoropropylene and vulcanization point monomer through copolymerization reaction, and its fluorine content can be up to 70%, and can be cross-linked and vulcanized by using peroxide. Has excellent weather resistance, ozone resistance, oil resistance and chemical resistance. The vulcanized rubber has a grid structure of C-C bonds, high bond energy, high chemical stability, excellent thermal-oxidative aging resistance, low permanent deformation, good elasticity and excellent scorching resistance of the vulcanized rubber.
The material is suggested to be applicable to the fields of automobile industry, petroleum, chemical industry, machinery, aerospace and the like, and is resistant to gasoline, methyl-ethyl alcohol, strong oxidant, flame retardance, aging resistance and a series of environments, such as a valve chamber cover pad and an air inlet pipe pad of a methanol engine, electric oil heater and the like, or the design and application of a sealing gasket with the air medium temperature within minus 42-300 ℃.
The engine sealing material solves the problem that the common traditional engine sealing material is prepared by mixing nitrile rubber and fiber filler and is used for sealing gasoline and lubricating oil. However, the materials have poor high-low temperature resistance and liquid resistance, large corrosion and deformation, and insufficient aging resistance and durability, so that the problem of premature failure of the seal is caused.
The scope of the present invention includes, but is not limited to, the above embodiments, and the present invention is defined by the appended claims, and any alterations, modifications, and improvements that may occur to those skilled in the art are all within the scope of the present invention.
Claims (7)
1. The manufacturing process of the high-fluorine-containing rubber sealing plate is characterized by comprising the following steps of:
1) opening: putting auxiliary materials according to a certain proportion into an opener for opening treatment;
2) and (3) soaking the rubber: soaking granular high fluorine-containing rubber with the part ratio of 1:1.8 in a solvent prepared in advance;
3) mixing materials: feeding the auxiliary materials subjected to loosening treatment in the step 1 and the soaked high-fluorine rubber solution in the step 2 into a mixer, carrying out primary stirring, and then adding a solvent for secondary stirring;
4) sheet forming: feeding the mixed materials into a sheet forming machine to obtain a whole sheet of plate, controlling the temperature of a small roller to be 5-10 ℃ and the temperature of a big roller to be 90-120 ℃;
5) and (3) vulcanization: the above panels were pre-baked and sulfur cured.
2. The manufacturing process of the high-fluorine-containing rubber sealing plate material as claimed in claim 1, wherein the auxiliary materials comprise, by weight, 3-10 parts of aramid pulp fiber, 5-25 parts of other fibers, 18-25 parts of active white carbon black, 15-21 parts of light calcium, 3-8 parts of magnesium oxide, 10-25 parts of kaolin, 1-5 parts of a cross-linking agent and 2-8 parts of a silane coupling agent.
3. The manufacturing process of the high-fluorine rubber sealing plate as claimed in claim 2, wherein the other fibers comprise glass fibers or ceramic fibers.
4. The manufacturing process of the high-fluorine-containing rubber sealing plate as claimed in claim 1, wherein the solvent comprises the following components in parts by weight: 1, methyl ketone and butyl ester.
5. The manufacturing process of the high-fluorine rubber sealing plate as claimed in claim 1, wherein the primary stirring time is 40-50 minutes.
6. The manufacturing process of the high-fluorine rubber sealing plate according to claim 1, wherein the number of positive sulfurs is two.
7. The manufacturing process of the high-fluorine rubber sealing plate as claimed in claim 1, wherein the baking temperature is 150-160 °.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201911105256.8A CN111073183A (en) | 2019-11-11 | 2019-11-11 | Manufacturing process of high-fluorine-content rubber sealing plate |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201911105256.8A CN111073183A (en) | 2019-11-11 | 2019-11-11 | Manufacturing process of high-fluorine-content rubber sealing plate |
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| CN111073183A true CN111073183A (en) | 2020-04-28 |
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Citations (6)
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| CN1487010A (en) * | 2003-08-04 | 2004-04-07 | 山东烟台石棉制品总厂 | Non-asbestos stool plate and its making process |
| CN101003719A (en) * | 2006-11-14 | 2007-07-25 | 南京工业大学 | Mixed fiber enhanced rubber based sealing composite material, and preparing technique |
| CN102501298A (en) * | 2011-09-23 | 2012-06-20 | 浙江国泰密封材料股份有限公司 | Completely-asbestos-free environment-friendly sealing plate and method for preparation thereof |
| CN103147345A (en) * | 2013-02-21 | 2013-06-12 | 舟山市海山密封材料有限公司 | Preparation technology of sealing material used for engines and flanges |
| CN105949681A (en) * | 2016-05-13 | 2016-09-21 | 舟山市海山密封材料有限公司 | Sealing material resistant to methanol gasoline |
-
2019
- 2019-11-11 CN CN201911105256.8A patent/CN111073183A/en active Pending
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1263903A (en) * | 2000-02-16 | 2000-08-23 | 太仓市宝马密封材料有限公司 | Sealing elastomer material reinforced by non-asbestos fibres and technology for compressing it into plates |
| CN1487010A (en) * | 2003-08-04 | 2004-04-07 | 山东烟台石棉制品总厂 | Non-asbestos stool plate and its making process |
| CN101003719A (en) * | 2006-11-14 | 2007-07-25 | 南京工业大学 | Mixed fiber enhanced rubber based sealing composite material, and preparing technique |
| CN102501298A (en) * | 2011-09-23 | 2012-06-20 | 浙江国泰密封材料股份有限公司 | Completely-asbestos-free environment-friendly sealing plate and method for preparation thereof |
| CN103147345A (en) * | 2013-02-21 | 2013-06-12 | 舟山市海山密封材料有限公司 | Preparation technology of sealing material used for engines and flanges |
| CN105949681A (en) * | 2016-05-13 | 2016-09-21 | 舟山市海山密封材料有限公司 | Sealing material resistant to methanol gasoline |
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Application publication date: 20200428 |