CN111087709A - Pressurized sealing injection agent for austenitic stainless steel structure - Google Patents
Pressurized sealing injection agent for austenitic stainless steel structure Download PDFInfo
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- CN111087709A CN111087709A CN201911401859.2A CN201911401859A CN111087709A CN 111087709 A CN111087709 A CN 111087709A CN 201911401859 A CN201911401859 A CN 201911401859A CN 111087709 A CN111087709 A CN 111087709A
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- stainless steel
- austenitic stainless
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- steel structure
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L23/00—Compositions of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Compositions of derivatives of such polymers
- C08L23/02—Compositions of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Compositions of derivatives of such polymers not modified by chemical after-treatment
- C08L23/16—Elastomeric ethene-propene or ethene-propene-diene copolymers, e.g. EPR and EPDM rubbers
-
- 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
- C08K3/18—Oxygen-containing compounds, e.g. metal carbonyls
- C08K3/20—Oxides; Hydroxides
- C08K3/22—Oxides; Hydroxides of metals
- C08K2003/2296—Oxides; Hydroxides of metals of zinc
-
- 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
- C08K3/24—Acids; Salts thereof
- C08K3/26—Carbonates; Bicarbonates
- C08K2003/265—Calcium, strontium or barium carbonate
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- Chemical & Material Sciences (AREA)
- Health & Medical Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Medicinal Chemistry (AREA)
- Polymers & Plastics (AREA)
- Organic Chemistry (AREA)
- Sealing Material Composition (AREA)
Abstract
The invention discloses a pressurized sealing injection agent for an austenitic stainless steel structure, which comprises ethylene propylene diene monomer, a plasticizer, a reinforcing agent, a filler, a vulcanizing agent, an accelerator and an anti-aging agent; the ethylene propylene diene monomer contains no sulfur and halogen, the ENB value is 6.7-8.7, the ethylene content is 53-59 wt%, and the Mooney viscosity is 38-52ML (1 +4 at 100 ℃); the plasticizer adopts environment-friendly paraffin oil without sulfur and halogen, the vulcanizing agent and the accelerator adopt a peroxide vulcanizing system without sulfur and halogen, the reinforcing agent is carbon black, the filler is one or more of talcum powder, calcium carbonate and argil, and the anti-aging agent adopts 2,2, 4-trimethyl-1, 2-dihydroquinoline polymer. The pressurized sealing injection agent for the austenitic stainless steel structure has extremely low content of halogen and sulfur elements, and can effectively solve the problem of stress corrosion risk of the austenitic stainless steel in the pressurized sealing process.
Description
Technical Field
The invention relates to the technical field of pressurized sealing injection agents, in particular to a pressurized sealing injection agent with extremely low content of halogen and sulfur elements for an austenitic stainless steel structure.
Background
In the continuous production process, the leakage problem inevitably occurs at the equipment, the pipeline, the valve and the connection part due to the influence of factors such as the loss of the device, the corrosion of the medium, the change of the temperature and the pressure and the like. The pressurized sealing technology is applied in the industrial production field in the middle of the 70 th century, the leakage can be eliminated under the conditions of no production stop, no temperature rise and drop and no pressure reduction, the pressurized sealing technology has the advantages of no fire, no electricity consumption in most cases, basically no need of treatment on the leakage surface, simplicity and rapidness in operation and the like, and the pressurized sealing technology is suitable for the requirement of modern industrial continuous production.
Stainless steel having an austenitic structure at normal temperature is called austenitic stainless steel, and austenitic stainless steel is nonmagnetic, has high toughness and plasticity, and is resistant to corrosion by media such as oxidizing acid, but has low strength, cannot be strengthened by phase transformation, and can only be strengthened by cold working. Because the austenitic stainless steel has good comprehensive performance, the austenitic stainless steel is widely applied to industries such as power plants, chemical engineering, ocean engineering, food, biomedicine, petrochemical engineering and the like.
Austenitic stainless steels, as a metallic material, are also inevitably subject to corrosion problems, the risk of stress corrosion of the austenitic stainless steels by elemental sulphur and halogens, in particular Cl-And
the passive film on the surface of the austenitic stainless steel is damaged, and stress corrosion is caused. In the construction process of pressure sealing, the sealing injection agent can directly contact with the surfaces of structures such as pipelines, flanges and the like made of austenitic stainless steel materials, the sulfur element and halogen in the sealing agent tend to increase the stress corrosion risk of the austenitic stainless steel, and high environmental protection requirements are put forward on the pressure sealing injection agent in some special occasionsFor example, nuclear power plants require the sulfur content and the halogen content of the pressurized sealant to be below 1000 ppm.
Disclosure of Invention
The invention aims to solve the problem of the stress corrosion risk of austenitic stainless steel in the process of pressurized sealing, and provides a pressurized sealing injection agent with extremely low content of halogen and sulfur elements, which is suitable for austenitic stainless steel structures, and is particularly suitable for pressurized sealing of steam and water systems.
The technical scheme adopted for realizing the purpose of the invention is as follows:
a pressurized sealant for austenitic stainless steel construction, comprising, in weight percent:
the Ethylene Propylene Diene Monomer (EPDM) does not contain sulfur and halogen, the ENB value is 6.7-8.7, the ethylene content is 53-59 wt%, and the Mooney viscosity is 38-52ML (1 +4 at 100 ℃); the plasticizer adopts paraffin oil without sulfur and halogen.
Preferably, the paraffin oil adopts KP6030, the paraffin content is more than 80 percent, and the flash point is more than 220 ℃. The paraffin oil contains no sulfur and halogen, can effectively plasticize ethylene propylene diene monomer, and is safe to use.
Preferably, the reinforcing agent is one or two of carbon black N774 and carbon black N990, and the carbon black N774 and the carbon black N990 are matched for use, so that the ethylene propylene diene monomer rubber has better reinforcing property, and simultaneously, the good processability and the good extrusion property are ensured.
Preferably, the filler is one or more of talcum powder, calcium carbonate and argil. The talcum powder, the calcium carbonate and the argil are all metal oxides and inorganic salts, do not contain halogen and sulfur elements, and can effectively improve the high-temperature steam resistance of the sealing material.
Preferably, the vulcanizing agent and the accelerator are peroxide vulcanizing systems without sulfur and halogen, wherein the vulcanizing agent can be one of dicumyl peroxide (DCP), 1-di-tert-butylperoxy-3, 3, 5-trimethylcyclohexane and 2, 5-dimethyl-2, 5-bis (tert-butylperoxy) hexane. Further preferably, the vulcanizing agent is dicumyl oxide (DCP) vulcanizing agent.
Preferably, the accelerator is zinc oxide ZnO or a mixture of zinc oxide ZnO and one or more of magnesium oxide MgO, stearic acid and triallyl cyanurate (TAC), and does not contain sulfur and halogen, wherein the zinc oxide, the magnesium oxide and the stearic acid are general active accelerators for rubber, and can improve the crosslinking degree of the rubber.
The triallyl cyanurate (TAC) is matched with a peroxide vulcanizing agent, so that the product is high in curing speed at high temperature after being injected and cured, and is pollution-free.
Preferably, the antioxidant adopts ketoamine and p-phenylenediamine antioxidants (RD), is nontoxic, and can effectively inhibit the thermal aging of the ethylene propylene diene monomer.
More preferably, the anti-aging agent is 2,2, 4-trimethyl-1, 2-dihydroquinoline polymer (RD).
The pressurized sealing injection agent for the austenitic stainless steel structure has extremely low content of halogen and sulfur elements, and can effectively solve the problem of stress corrosion risk of the austenitic stainless steel in the pressurized sealing process.
Detailed Description
The present invention will be described in further detail with reference to specific examples. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
Example 1
Preparing materials:
weighing 1000g of EPDM (Jihua 4045), 150g of N774 carbon black, 600g of N990 carbon black, 250g of talcum powder, 250g of calcium carbonate, 150g of argil, 200g of paraffin oil (KP6030), 70g of odorless DCP, 10g of ZnO, 5g of MgO, 10g of stearic acid, 5g of TAC and 5g of RD.
The preparation method comprises the following steps:
adjusting the open mill to a proper roll spacing, plasticating the ethylene propylene diene monomer crude rubber in the open mill, repeatedly performing triangular wrapping operation for not less than 20 times after the rubber material wraps the roll, and finishing plastication.
Adding powdery materials such as reinforcing agent, filler, magnesium oxide, zinc oxide, anti-aging agent and the like in batches, particularly adding carbon black, argil, calcium carbonate and the like which are used for more materials in five to six times or reserving subsequent addition with the total amount not exceeding 500g, and continuously pouring and mixing until the powdery materials are completely eaten into the rubber compound.
And slowly adding paraffin oil on the rubber sheet wrapped by the roller, and then pouring and mixing the rubber again after the paraffin oil is completely added until no obvious oil stain exists on the surface of the rubber sheet.
Adding vulcanizing agent, accelerator and residual powdery material in batches, and continuously performing coiling or triangular packaging operation until the surface color of the mixed rubber sheet is uniform.
And (3) preparing the mixed rubber into a rear lower sheet, and cutting the rubber material into rubber strips with the width not more than 5 centimeters and unlimited length by utilizing a cutter.
The adhesive tape is hung or spread and placed, and the curing time is not less than 24 hours.
Starting a rubber extruder, adjusting a proper extrusion speed, starting a circulating water cooling system to ensure that the extrusion temperature does not exceed 60 ℃, filling cured rubber strips into a feed inlet of the extruder one by one, wherein the size of a machine head is phi 22, and the extrusion length of the rubber strips is controlled to be about 2 meters.
The adhesive tape is cut into a phi 22 multiplied by 85 rod-shaped sealant with pressure by a rubber cutting die.
And packaging with a PE plastic bag, boxing the product, and storing at normal temperature.
Example 2
1000g of EPDM (Jihua 4045), 200g of N774 carbon black, 450g of N990 carbon black, 450g of talcum powder, 350g of calcium carbonate, 100g of argil, 400g of paraffin oil (KP6030), 50g of odorless DCP, 30g of ZnO, 15g of MgO, 20g of stearic acid, 10g of TAC and 10g of RD10 g.
Example 3
1000g of EPDM (Jihua 4045), 500g of N774 carbon black, 300g of N990 carbon black, 300g of talcum powder, 300g of calcium carbonate, 250g of argil, 300g of paraffin oil (KP6030), 40g of odorless DCP, 40g of ZnO, 10g of MgO, 25g of stearic acid, 10g of TAC and 15 g.
Example 4
1000g of EPDM (Jihua 4045), 750g of N774 carbon black, 200g of N990 carbon black, 150g of talcum powder, 200g of calcium carbonate, 200g of argil, 100g of paraffin oil (KP6030), 20g of odorless DCP, 50g of ZnO, 20g of MgO, 15g of stearic acid, 15g of TAC and RD25 g.
The formula product of the invention is compared with the sulfur vulcanized rubber belt-pressing sealing injection agent on the market as follows:
| item | Performance requirements | Sulfur vulcanization formula | Example 1 | Example 2 | Example 3 | Example 4 |
| hardness/Shore A | ≤70 | 56 | 50 | 53 | 59 | 65 |
| Density/(g/cm)3) | 1.1-1.4 | 1.23 | 1.20 | 1.25 | 1.22 | 1.24 |
| Weight loss on heating (250 ℃)/% | ≤25 | 5 | 3 | 6 | 4 | 3 |
| Halogen content/ppm | ≤1000 | Fail to be qualified | Qualified | Qualified | Qualified | Qualified |
| Total sulfur content/ppm | ≤1000 | Fail to be qualified | Qualified | Qualified | Qualified | Qualified |
The foregoing is only a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, various modifications and decorations can be made without departing from the principle of the present invention, and these modifications and decorations should also be regarded as the protection scope of the present invention.
Claims (8)
1. The pressurized sealant for austenitic stainless steel structures is characterized by comprising the following components in percentage by weight:
the ethylene propylene diene monomer contains no sulfur and halogen, the ENB value is 6.7-8.7, the ethylene content is 53-59 wt%, and the Mooney viscosity is 38-52ML (1 +4 at 100 ℃); the plasticizer adopts paraffin oil without sulfur and halogen.
2. The pressurized sealant for austenitic stainless steel structure according to claim 1, wherein the paraffin oil is KP6030, paraffin content is more than 80%, and flash point is more than 220 ℃.
3. The pressurized sealant for austenitic stainless steel structure as claimed in claim 1, wherein the reinforcing agent is one or both of carbon black N774 and carbon black N990.
4. The pressurized sealant for austenitic stainless steel structure according to claim 1, wherein the filler is one or more of talc, calcium carbonate and china clay.
5. The pressurized sealant for austenitic stainless steel structures according to claim 1, wherein the vulcanizing agent and accelerator are peroxide vulcanization systems free of sulfur and halogen; wherein, the vulcanizing agent can adopt one of dicumyl peroxide, 1-di-tert-butylperoxy-3, 3, 5-trimethylcyclohexane and 2, 5-dimethyl-2, 5-di (tert-butylperoxy) hexane.
6. The pressurized sealing injection agent for austenitic stainless steel structure according to claim 5, wherein the vulcanizing agent is di-tert-butylperoxydiisopropylbenzene vulcanizing agent, the accelerator is zinc oxide (ZnO), or a mixture of zinc oxide (ZnO) and one or more of magnesium oxide (MgO), stearic acid and triallyl cyanurate.
7. The pressurized sealant for austenitic stainless steel structure as claimed in claim 1, wherein the antioxidant is ketoamine type or p-phenylenediamine type antioxidant.
8. The pressurized sealant for austenitic stainless steel structure according to claim 7, wherein the anti-aging agent is 2,2, 4-trimethyl-1, 2-dihydroquinoline polymer.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911401859.2A CN111087709A (en) | 2019-12-31 | 2019-12-31 | Pressurized sealing injection agent for austenitic stainless steel structure |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911401859.2A CN111087709A (en) | 2019-12-31 | 2019-12-31 | Pressurized sealing injection agent for austenitic stainless steel structure |
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| CN111087709A true CN111087709A (en) | 2020-05-01 |
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Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1458181A (en) * | 2002-05-16 | 2003-11-26 | 拜尔公司 | Halogen-free and sulfur-free formed product contining rubber-isobutylene peroxide sulfide rubber material |
| CN102071637A (en) * | 2010-12-08 | 2011-05-25 | 衡水橡胶股份有限公司 | Expansion device for bridges |
| CN104292657A (en) * | 2014-09-25 | 2015-01-21 | 沈阳化工大学 | Sulfur-free ethylene propylene diene monomer tube rubber material |
| CN104725730A (en) * | 2015-03-09 | 2015-06-24 | 沈阳化工大学 | Sulfur-free ethylene-propylene-diene monomer material |
| CN112341719A (en) * | 2020-11-26 | 2021-02-09 | 江苏海龙核科技股份有限公司 | Novel safe, environment-friendly, flame-retardant and fire-resistant ethylene propylene diene monomer rubber and preparation method thereof |
-
2019
- 2019-12-31 CN CN201911401859.2A patent/CN111087709A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1458181A (en) * | 2002-05-16 | 2003-11-26 | 拜尔公司 | Halogen-free and sulfur-free formed product contining rubber-isobutylene peroxide sulfide rubber material |
| CN102071637A (en) * | 2010-12-08 | 2011-05-25 | 衡水橡胶股份有限公司 | Expansion device for bridges |
| CN104292657A (en) * | 2014-09-25 | 2015-01-21 | 沈阳化工大学 | Sulfur-free ethylene propylene diene monomer tube rubber material |
| CN104725730A (en) * | 2015-03-09 | 2015-06-24 | 沈阳化工大学 | Sulfur-free ethylene-propylene-diene monomer material |
| CN112341719A (en) * | 2020-11-26 | 2021-02-09 | 江苏海龙核科技股份有限公司 | Novel safe, environment-friendly, flame-retardant and fire-resistant ethylene propylene diene monomer rubber and preparation method thereof |
Non-Patent Citations (3)
| Title |
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| 《橡胶工业手册》编写小组: "《橡胶工业手册 第5分册 工业、生活及乳胶制品》", 30 November 1975 * |
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