CN108690235A - A kind of corrosion-resistant sealing ring and preparation method thereof - Google Patents
A kind of corrosion-resistant sealing ring and preparation method thereof Download PDFInfo
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- CN108690235A CN108690235A CN201810532553.XA CN201810532553A CN108690235A CN 108690235 A CN108690235 A CN 108690235A CN 201810532553 A CN201810532553 A CN 201810532553A CN 108690235 A CN108690235 A CN 108690235A
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- carbon fiber
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- sealing ring
- corrosion
- resistant sealing
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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
- C08L9/00—Compositions of homopolymers or copolymers of conjugated diene hydrocarbons
- C08L9/06—Copolymers with styrene
-
- 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
- C08K2003/221—Oxides; Hydroxides of metals of rare earth metal
-
- 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
- C08K2003/2227—Oxides; Hydroxides of metals of aluminium
-
- 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
-
- 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
- C08K3/38—Boron-containing compounds
- C08K2003/387—Borates
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L2205/00—Polymer mixtures characterised by other features
- C08L2205/03—Polymer mixtures characterised by other features containing three or more polymers in a blend
- C08L2205/035—Polymer mixtures characterised by other features containing three or more polymers in a blend containing four or more polymers in a blend
Abstract
The present invention provides a kind of corrosion-resistant sealing ring and preparation method thereof, which includes:1)Carbon fiber, cyclodextrin, silane coupling agent and water are subjected to haptoreaction, then filter to take filtration cakes torrefaction so that modified carbon fiber is made;2)Modified carbon fiber, silver salt, zinc salt, urea and water are subjected to hydro-thermal reaction, then filter to take filter cake, is finally calcined in the presence of protecting gas so that compound carbon fiber is made;3)Compound carbon fiber, oyster shell whiting, attapulgite, silicon carbide, rare earth oxide are mixed so that improved composition is made;4)Butadiene-styrene rubber, ethylene propylene diene rubber, fluorubber, talcum powder, zinc borate, white carbon, white oil, aluminium hydroxide, the improved composition are kneaded, extrusion molding is to be made the corrosion-resistant sealing ring.Improved composition obtained can dramatically improve that sealing ring is acidproof and alkaline resistance properties by the method for the invention, while the preparation method process is simple, raw material is easy to get.
Description
Technical field
The present invention relates to sealing rings, and in particular, to a kind of corrosion-resistant sealing ring and preparation method thereof.
Background technology
Sealing element is generally made of rotating ring, stationary ring and sealing ring;Wherein sealing ring plays the sealing effect of sealing element
Vital effect.Sealing ring will generally meet the following conditions:High resilience and resilience;Mechanical strength appropriate, including
Tensile strength, elongation and tearing toughness etc.;It can stablize, be not easy to be swollen in the medium, thermal pinch(Joule effect)It is small;
Easy processing is molded, and can keep accurate size;Do not corrode contact surface, not pollution medium etc..
Currently, sealing element is divided according to material, it is close that NBR nitrile rubbers sealing ring, HNBR hydrogenated nitrile-butadiene rubbers can be divided into
Seal, FLS fluorine silicone rubber sealing ring, CR neoprene packing circles etc., although above-mentioned sealing element disclosure satisfy that production requirement substantially,
But the corrosion resistance of sealing element is difficult to meet above-mentioned requirements in certain specific environment, such as above-mentioned sealing ring is difficult to simultaneously
Meet acidproof or alkaline-resisting requirement.
Invention content
The object of the present invention is to provide a kind of corrosion-resistant sealing rings and preparation method thereof, pass through sealing ring made from this method
There is acidproof and alkaline resistance properties simultaneously, while the preparation method has the advantages that process is simple and raw material is easy to get.
To achieve the goals above, the present invention provides a kind of preparation method of corrosion-resistant sealing ring, the preparation method packets
It includes:
1)Carbon fiber, cyclodextrin, silane coupling agent and water are subjected to haptoreaction, filtration cakes torrefaction is then filtered to take and is modified with being made
Carbon fiber;
2)Modified carbon fiber, silver salt, zinc salt, urea and water are subjected to hydro-thermal reaction, then filter to take filter cake, finally in protection gas
In the presence of calcined be made compound carbon fiber;
3)Compound carbon fiber, oyster shell whiting, attapulgite, silicon carbide, rare earth oxide are mixed so that improved composition is made;
4)By butadiene-styrene rubber, ethylene propylene diene rubber, fluorubber, talcum powder, zinc borate, white carbon, white oil, aluminium hydroxide, modification
Composition is kneaded, extrusion molding is to be made the corrosion-resistant sealing ring.
The present invention also provides a kind of corrosion-resistant sealing ring, the corrosion-resistant sealing ring is by prepared by above-mentioned preparation method
.
In the above-mentioned technical solutions, the present invention forms cyclodextrin cladding by silane coupling agent on the surface of carbon fiber first
Layer, then by hydro-thermal reaction the surface of cyclodextrin clad formed nano silver, Nano-Zinc or nanometer silver-colored zinc composite material with
Compound carbon fiber is obtained, is then made by the combination of compound carbon fiber, oyster shell whiting, attapulgite, silicon carbide, rare earth oxide
The composition can improve the corrosion resistance of sealing ring, finally by butadiene-styrene rubber, ethylene propylene diene rubber, fluorubber, talcum
Powder, zinc borate, white carbon, white oil, aluminium hydroxide, improved composition be kneaded, be molded can be had simultaneously it is acidproof and
The sealing ring of alkaline resistance properties;The preparation method has the advantages that process is simple and raw material is easy to get simultaneously.
Other features and advantages of the present invention will be described in detail in subsequent specific embodiment part.
Specific implementation mode
The specific implementation mode of the present invention is described in detail below.It should be understood that described herein specific
Embodiment is merely to illustrate and explain the present invention, and is not intended to restrict the invention.
The present invention provides a kind of preparation method of corrosion-resistant sealing ring, which includes:
1)Carbon fiber, cyclodextrin, silane coupling agent and water are subjected to haptoreaction, filtration cakes torrefaction is then filtered to take and is modified with being made
Carbon fiber;
2)Modified carbon fiber, silver salt, zinc salt, urea and water are subjected to hydro-thermal reaction, then filter to take filter cake, finally in protection gas
In the presence of calcined be made compound carbon fiber;
3)Compound carbon fiber, oyster shell whiting, attapulgite, silicon carbide, rare earth oxide are mixed so that improved composition is made;
4)By butadiene-styrene rubber, ethylene propylene diene rubber, fluorubber, talcum powder, zinc borate, white carbon, white oil, aluminium hydroxide, described
Improved composition is kneaded, extrusion molding is to be made the corrosion-resistant sealing ring.
In the step 1 of the present invention)In, the dosage of each material can select in a wide range, but obtained in order to make
Sealing ring has superior acidproof and alkaline resistance properties, it is preferable that in step 1)In, carbon fiber, cyclodextrin, silane coupling agent and
The weight ratio of water is 30:10-15:5-10:80-150.
In the step 1 of the present invention)In, catalytic condition can select in a wide range, but in order to make to be made
Sealing ring have superior acidproof and alkaline resistance properties, in step 1)In, the haptoreaction meets following the following conditions:Instead
It is 65-80 DEG C to answer temperature, reaction time 3-5h.
In the step 1 of the present invention)In, dry condition can select in a wide range, but obtained close in order to make
Seal has superior acidproof and alkaline resistance properties, it is preferable that in step 1)In, drying meets the following conditions:Drying temperature is
100-120 DEG C, drying time 4-6h.
In the step 2 of the present invention)In, the dosage of each material can select in a wide range, but obtained in order to make
Sealing ring has superior acidproof and alkaline resistance properties, it is preferable that in step 2)In, modified carbon fiber, silver salt, zinc salt, urea
Weight ratio with water is 50:5-8:10-15:15-20:200-300.
In the step 2 of the present invention)In, the condition of hydro-thermal reaction can select in a wide range, but in order to make to be made
Sealing ring have superior acidproof and alkaline resistance properties, it is preferable that in step 2)In, hydro-thermal reaction meets following item
Part:Reaction temperature is 160-180 DEG C, reaction time 8-16h.
In the step 2 of the present invention)In, the condition of calcining can select in a wide range, but obtained close in order to make
Seal has superior acidproof and alkaline resistance properties, it is preferable that in step 2)In, calcining meets following the following conditions:From 15-30
It DEG C is warming up to 350-400 DEG C with 4.5-5 DEG C/min and keeps the temperature 30-50min, be then cooled to 200-280 DEG C with 1.5-2 DEG C/min
And 1.5-2h is kept the temperature, finally naturally cool to 15-30 DEG C.
In the step 3 of the present invention)In, the dosage of each material can select in a wide range, but obtained in order to make
Sealing ring has superior acidproof and alkaline resistance properties, it is preferable that in step 3)In, compound carbon fiber, oyster shell whiting, concave convex rod
Soil, silicon carbide, rare earth oxide weight ratio be 30:10-16:35-45:6-10:8-15.
In the present invention, the type of silane coupling agent can select in a wide range, but in order to make sealing obtained
Circle has superior acidproof and alkaline resistance properties, it is preferable that silane coupling agent is selected from vinyltriethoxysilane, vinyl three
At least one of methoxy silane, vinyl three (beta-methoxy ethyoxyl) silane).
In the present invention, the type of silver salt can select in a wide range, but in order to make sealing ring obtained have
Superior acidproof and alkaline resistance properties, it is preferable that silver salt is silver nitrate.
In the present invention, the type of zinc salt can select in a wide range, but in order to make sealing ring obtained have
Superior acidproof and alkaline resistance properties, it is preferable that zinc salt is selected from least one of zinc nitrate, zinc chloride and zinc sulfate.
In the present invention, protect the type of gas that can select in a wide range, but in order to make sealing ring obtained have
Superior acidproof and alkaline resistance properties, it is preferable that protection gas is selected from least one of helium, nitrogen, argon gas.
In the step 4 of the present invention)In, the dosage of each material can select in a wide range, but obtained in order to make
Sealing ring have superior acidproof and alkaline resistance properties, it is preferable that butadiene-styrene rubber, ethylene propylene diene rubber, fluorubber, talcum powder,
Zinc borate, white carbon, white oil, aluminium hydroxide, improved composition weight ratio be 50:22-28:30-40:18-23:6-9:3-
10:60-70:12-18:26-33.
In the step 4 of the present invention)In, the time of mixing can select in a wide range, but obtained close in order to make
Seal has superior acidproof and alkaline resistance properties, it is preferable that the time of mixing is 40-60min.
The present invention also provides a kind of improved composition, which is prepared by above-mentioned preparation method.
The present invention will be described in detail by way of examples below.
Embodiment 1
1)By carbon fiber, cyclodextrin, silane coupling agent(Vinyltriethoxysilane)With water according to 30:13:8:100 weight
Than carrying out haptoreaction(Reaction temperature is 70 DEG C, reaction time 4h), then filter to take filtration cakes torrefaction(Drying temperature is 110
DEG C, drying time 5h)Modified carbon fiber is made;
2)By the modified carbon fiber, silver salt(Silver nitrate), zinc salt(Zinc nitrate), urea and water is according to 50:7:13:18:280
Weight ratio carries out hydro-thermal reaction(Reaction temperature is 170 DEG C, reaction time 12h), filter cake is then filtered to take, finally in protection gas
(Helium)In the presence of calcined(Be warming up to 380 DEG C with 4.8 DEG C/min from 20 DEG C and keep the temperature 40min, then with 1.8 DEG C/
Min is cooled to 260 DEG C and keeps the temperature 1.8h, finally naturally cools to 18 DEG C)Compound carbon fiber is made;
3)By compound carbon fiber, oyster shell whiting, attapulgite, silicon carbide, rare earth oxide(Samarium oxide)According to 30:13:40:8:12
Weight ratio mixed be made improved composition A1.
Embodiment 2
1)By carbon fiber, cyclodextrin, silane coupling agent(Vinyltrimethoxysilane)With water according to 30:10:5:80 weight
Than carrying out haptoreaction(Reaction temperature is 65 DEG C, reaction time 5h), then filter to take filtration cakes torrefaction(Drying temperature is 100
DEG C, drying time 6h)Modified carbon fiber is made;
2)By the modified carbon fiber, silver salt(Silver nitrate), zinc salt(Zinc chloride), urea and water is according to 50:5:10:15:200
Weight ratio carries out hydro-thermal reaction(Reaction temperature is 160 DEG C, reaction time 16h), filter cake is then filtered to take, finally in protection gas
(Nitrogen)In the presence of calcined(Be warming up to 350 DEG C with 4.5 DEG C/min from 15 DEG C and keep the temperature 30min, then with 1.5 DEG C/
Min is cooled to 200 DEG C and keeps the temperature 1.5h, finally naturally cools to 15 DEG C)Compound carbon fiber is made;
3)By compound carbon fiber, oyster shell whiting, attapulgite, silicon carbide, rare earth oxide(Yttrium oxide)According to 30:10:35:6:8
Weight ratio mixed be made improved composition A2.
Embodiment 3
1)By carbon fiber, cyclodextrin, silane coupling agent(Vinyl three (beta-methoxy ethyoxyl) silane))With water according to 30:15:
10:150 weight ratio carries out haptoreaction(Reaction temperature is 80 DEG C, reaction time 3h), then filter to take filtration cakes torrefaction(It is dry
Dry temperature is 120 DEG C, drying time 4h)Modified carbon fiber is made;
2)By the modified carbon fiber, silver salt(Silver nitrate), zinc salt(Zinc sulfate), urea and water is according to 50:8:15:20:300
Weight ratio carries out hydro-thermal reaction(Reaction temperature is 180 DEG C, reaction time 8h), filter cake is then filtered to take, finally in protection gas
(Argon gas)In the presence of calcined(400 DEG C are warming up to 5 DEG C/min from 30 DEG C and keep the temperature 50min, then dropped with 2 DEG C/min
Temperature is to 280 DEG C and keeps the temperature 2h, finally naturally cools to 30 DEG C)Compound carbon fiber is made;
3)By compound carbon fiber, oyster shell whiting, attapulgite, silicon carbide, rare earth oxide(Dysprosia)According to 30:16:45:10:
15 weight ratio is mixed so that improved composition A3 is made.
Comparative example 1
It carries out that improved composition B1 is made according to the method for embodiment 1, unlike, step 1)In be not used cyclodextrin.
Comparative example 2
It carries out that improved composition B2 is made according to the method for embodiment 1, unlike, step 2)In be not used silver salt.
Comparative example 3
It carries out that improved composition B3 is made according to the method for embodiment 1, unlike, step 2)In be not used zinc salt.
Comparative example 4
It carries out that improved composition B4 is made according to the method for embodiment 1, unlike, step 2)In silver salt and zinc salt is not used.
Comparative example 5
It carries out that improved composition B5 is made according to the method for embodiment 1, unlike, step 2)Middle calcining is in 350-400
It is carried out at DEG C.
Comparative example 6
It carries out that improved composition B5 is made according to the method for embodiment 1, unlike, step 2)Middle calcining is in 200-280
It is carried out at DEG C.
Application examples 1
By butadiene-styrene rubber, ethylene propylene diene rubber, fluorubber, talcum powder, zinc borate, white carbon, white oil, aluminium hydroxide, above-mentioned change
Property composition is according to 50:26:35:20:7:6:65:16:29 weight ratio carries out mixing 50min, then carry out extrusion molding with
Sealing ring is made;Wherein improved composition is not added in control group;Then the drawing of sealing ring is detected according to GB/T 1701-2001
Intensity 1 is stretched, is then soaked in above-mentioned sealing ring in the acid solution that pH is 1 or the lye that pH is 14 respectively 7 days, then detection sealing
The tensile strength 2 of circle, the change rate of last tensile strength calculated, the change rate of tensile strength=(Tensile strength 1- tensile strengths
2)/ tensile strength 1 × 100%;Concrete outcome is shown in Table 1;Wherein, change rate 1 is the change rate after acid soak, and change rate 2 is alkali
Change rate after liquid immersion.
Table 1
| Composition | Change rate 1/% | Change rate 2/% |
| A1 | 2.8 | 1.9 |
| A2 | 3.1 | 2.5 |
| A3 | 3.3 | 2.4 |
| Nothing | 17.9 | 16.8 |
| B1 | 8.7 | 9.6 |
| B2 | 4.5 | 4.0 |
| B3 | 3.9 | 4.3 |
| B4 | 10.6 | 9.2 |
| B5 | 6.5 | 5.7 |
| B6 | 7.3 | 4.9 |
The preferred embodiment of the present invention has been described above in detail, still, the tool during present invention is not limited to the embodiments described above
Body details can carry out a variety of simple variants, these letters to technical scheme of the present invention within the scope of the technical concept of the present invention
Monotropic type all belongs to the scope of protection of the present invention.
It is further to note that specific technical features described in the above specific embodiments, in not lance
In the case of shield, can be combined by any suitable means, in order to avoid unnecessary repetition, the present invention to it is various can
The combination of energy no longer separately illustrates.In addition, arbitrary group can also be carried out between a variety of different embodiments of the present invention
It closes, as long as it does not violate the idea of the present invention, it should also be regarded as the disclosure of the present invention.
Claims (8)
1. a kind of preparation method of corrosion-resistant sealing ring, which is characterized in that the preparation method includes:
1)Carbon fiber, cyclodextrin, silane coupling agent and water are subjected to haptoreaction, filtration cakes torrefaction is then filtered to take and is modified with being made
Carbon fiber;
2)The modified carbon fiber, silver salt, zinc salt, urea and water are subjected to hydro-thermal reaction, filter cake is then filtered to take, is finally protecting
It is calcined in the presence of shield gas compound carbon fiber is made;
3)The compound carbon fiber, oyster shell whiting, attapulgite, silicon carbide, rare earth oxide are mixed so that modified group is made
Close object;
4)By butadiene-styrene rubber, ethylene propylene diene rubber, fluorubber, talcum powder, zinc borate, white carbon, white oil, aluminium hydroxide, described
Improved composition is kneaded, extrusion molding is to be made the corrosion-resistant sealing ring.
2. preparation method according to claim 1, wherein in step 1)In, it is the carbon fiber, cyclodextrin, silane coupled
The weight ratio of agent and water is 30:10-15:5-10:80-150.
3. preparation method according to claim 1, wherein in step 1)In, the haptoreaction meets following item
Part:Reaction temperature is 65-80 DEG C, reaction time 3-5h;
Preferably, the drying meets the following conditions:Drying temperature is 100-120 DEG C, drying time 4-6h.
4. preparation method according to claim 1, wherein in step 2)In, the modified carbon fiber, silver salt, zinc salt, urine
The weight ratio of element and water is 50:5-8:10-15:15-20:200-300.
5. preparation method according to claim 1, wherein in step 2)In, the hydro-thermal reaction meets following item
Part:Reaction temperature is 160-180 DEG C, reaction time 8-16h.
6. preparation method according to claim 1, wherein in step 2)In, the calcining meets following the following conditions:From
15-30 DEG C is warming up to 350-400 DEG C with 4.5-5 DEG C/min and keeps the temperature 30-50min, is then cooled to 200- with 1.5-2 DEG C/min
280 DEG C and 1.5-2h is kept the temperature, finally naturally cools to 15-30 DEG C.
7. preparation method according to claim 1, wherein in step 3)In, the compound carbon fiber, oyster shell whiting, bumps
Stick soil, silicon carbide, rare earth oxide weight ratio be 30:10-16:35-45:6-10:8-15.
8. a kind of corrosion-resistant sealing ring, which is characterized in that the corrosion-resistant sealing ring passes through any one of claim 1-7 institutes
The preparation method stated is prepared.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810532553.XA CN108690235A (en) | 2018-05-29 | 2018-05-29 | A kind of corrosion-resistant sealing ring and preparation method thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810532553.XA CN108690235A (en) | 2018-05-29 | 2018-05-29 | A kind of corrosion-resistant sealing ring and preparation method thereof |
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| CN108690235A true CN108690235A (en) | 2018-10-23 |
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ID=63849344
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| CN201810532553.XA Withdrawn CN108690235A (en) | 2018-05-29 | 2018-05-29 | A kind of corrosion-resistant sealing ring and preparation method thereof |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110452466A (en) * | 2019-07-29 | 2019-11-15 | 安徽龙行密封件有限公司 | A kind of fire-retardant sealing element and preparation method thereof |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4496674A (en) * | 1983-11-17 | 1985-01-29 | Armstrong World Industries, Inc. | Gasket materials comprising polyester and rice hulls |
| CN104910561A (en) * | 2015-06-13 | 2015-09-16 | 梁胜光 | Regenerated rubber sealing ring |
| CN106147048A (en) * | 2015-03-31 | 2016-11-23 | 3M创新有限公司 | Sealing compositions and application thereof |
-
2018
- 2018-05-29 CN CN201810532553.XA patent/CN108690235A/en not_active Withdrawn
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4496674A (en) * | 1983-11-17 | 1985-01-29 | Armstrong World Industries, Inc. | Gasket materials comprising polyester and rice hulls |
| CN106147048A (en) * | 2015-03-31 | 2016-11-23 | 3M创新有限公司 | Sealing compositions and application thereof |
| CN104910561A (en) * | 2015-06-13 | 2015-09-16 | 梁胜光 | Regenerated rubber sealing ring |
Non-Patent Citations (1)
| Title |
|---|
| 橡胶工业手册编写小组: "《橡胶工业手册 第三分册基本工艺》", 31 August 1976, 石油化学工业出版社 * |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110452466A (en) * | 2019-07-29 | 2019-11-15 | 安徽龙行密封件有限公司 | A kind of fire-retardant sealing element and preparation method thereof |
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Application publication date: 20181023 |