CN109181169A - A kind of valve explosion-proof viton seal ring and its processing technology - Google Patents
A kind of valve explosion-proof viton seal ring and its processing technology Download PDFInfo
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- CN109181169A CN109181169A CN201810861903.7A CN201810861903A CN109181169A CN 109181169 A CN109181169 A CN 109181169A CN 201810861903 A CN201810861903 A CN 201810861903A CN 109181169 A CN109181169 A CN 109181169A
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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
- C08L27/00—Compositions 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; Compositions of derivatives of such polymers
- C08L27/02—Compositions 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; Compositions of derivatives of such polymers not modified by chemical after-treatment
- C08L27/12—Compositions 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; Compositions of 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
- C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
- C08K3/00—Use of inorganic substances as compounding ingredients
- C08K3/16—Halogen-containing compounds
- C08K2003/162—Calcium, strontium or barium halides, e.g. calcium, strontium or barium chloride
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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
- 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
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Abstract
The invention discloses a kind of explosion-proof viton seal rings of valve, sealing ring including valve sealing part, the sealing ring includes the raw material of following parts by weight: raw rubber: 100-120 parts, vulcanizing agent: and 2-4 parts, crosslinking agent: 4-7 parts, inner pattern releasing agent applicable: 1-3 parts, acid absorbent: 1-3 parts, calcirm-fluoride: 10-18 parts, spray carbon black: 11-17 parts, cure initiator: 3-8 parts, reinforcing agent: 6-9 parts；The present invention not only increases the durability and crushing resistance of product, reduces application risk, has saved production cost, and processing technology step is simple, easy to operate.
Description
Technical field
The present invention relates to sealing ring and its processing technique fields, and it is close with explosion-proof fluorubber to particularly relate to a kind of valve
Seal and its processing technology.
Background technique
Valve seal in the prior art is typically all to use pedestal polytetrafluoroethylene (PTFE) ball valve seat, the embedding nitrile rubber of sealing surface
And fluororubber O-type ring, rubber ring compressive property is inadequate in the state of gas pipeline or high pressure, it is easy to just burst, occur
There is very big security risk in leakage, replacement frequently causes the waste of a large amount of manpower and fund to client, for time saving province
Power reduces security risk, and the invention proposes a kind of valve explosion-proof viton seal rings and its processing technology.
Summary of the invention
The technical problem to be solved by the present invention is to propose a kind of valve with explosion-proof the shortcomings that for the above prior art
Viton seal ring and its processing technology not only increase the durability and crushing resistance of product, reduce application risk, save
Production cost, and processing technology step is simple, it is easy to operate.
To achieve the above object, the present invention provides technical solution below:
A kind of explosion-proof viton seal ring of valve, the sealing ring including valve sealing part, the sealing ring include following parts by weight
Several raw materials:
Raw rubber: 100-120 parts,
Vulcanizing agent: 2-4 parts,
Crosslinking agent: 4-7 parts,
Inner pattern releasing agent applicable: 1-3 parts,
Acid absorbent: 1-3 parts,
Calcirm-fluoride: 10-18 parts,
Spray carbon black: 11-17 parts,
Cure initiator: 3-8 parts,
Reinforcing agent: 6-9 parts.
The further technical solution of the present invention is:
The explosion-proof viton seal ring of valve above-mentioned, raw rubber use Mooney viscosity for 170 fluorubber.
The explosion-proof viton seal ring of valve above-mentioned, vulcanizing agent use cumyl peroxide；Crosslinking agent uses 3 third
Alkenyl isocyanuric acid ester；Inner pattern releasing agent applicable uses zinc stearate；Acid absorbent uses calcium hydroxide.
The explosion-proof viton seal ring of valve above-mentioned, reinforcing agent are made of the raw material of following weight parts: polypropylene
(T30S) powder: 11-18 parts, hexagonal boron nitride: 8-11 parts, alum powder: 1-6 parts, ethylene group bis-stearamides: 5-8 parts, eucalyptus
Oil: 9-13 parts, Imarcaptoacetate dioctyltin: 10-17 parts, Sodium Polyacrylate: 3-8 parts.
The explosion-proof viton seal ring of valve above-mentioned, which includes the raw material of following parts by weight:
Raw rubber: 100 parts,
Vulcanizing agent: 2 parts,
Crosslinking agent: 4 parts,
Inner pattern releasing agent applicable: 1 part,
Acid absorbent: 1 part,
Calcirm-fluoride: 10 parts,
Spray carbon black: 11 parts,
Cure initiator: 3 parts,
Reinforcing agent: 6 parts.
The explosion-proof viton seal ring of valve above-mentioned, which includes the raw material of following parts by weight:
Raw rubber: 120 parts,
Vulcanizing agent: 4 parts,
Crosslinking agent: 7 parts,
Inner pattern releasing agent applicable: 3 parts,
Acid absorbent: 3 parts,
Calcirm-fluoride: 18 parts,
Spray carbon black: 17 parts,
Cure initiator: 8 parts,
Reinforcing agent: 9 parts.
The processing technology of the explosion-proof viton seal ring of valve above-mentioned, comprising the following steps:
(1) it premixes: vulcanizing agent, crosslinking agent, inner pattern releasing agent applicable, acid absorbent, cure initiator and reinforcing agent is mixed in blender
It closes uniformly, it is stand-by to obtain pre-composition；
(2) raw rubber investment is mediated and is plasticated in mixer, heating temperature is to 120-130 DEG C, mixing speed 105-
110r/min, mixing time 15-20min are subsequently added into calcirm-fluoride and spray carbon black, are kneaded, mixing time 20-
25min；
(3) it is subsequently added into the resulting pre-composition of step (1) and is stirred mixing together, melting temperature is 145-165 DEG C, pressure
For 8-11KN, kneading banbury rotating speed is 110-120r/min, mixing time 1-2h；
(4) vulcanized: first carrying out one step cure, one step cure temperature is 175-185 DEG C, vulcanization time 13-18min, sulphur
Change pressure is 12-14Mpa；Post vulcanization is carried out again, and post vulcanization temperature is 240-260 DEG C, vulcanization time 11-13min, sulphur
Finished product can be obtained after change.
The processing technology of the explosion-proof viton seal ring of valve above-mentioned, comprising the following steps:
(1) it premixes: vulcanizing agent, crosslinking agent, inner pattern releasing agent applicable, acid absorbent, cure initiator and reinforcing agent is mixed in blender
It closes uniformly, it is stand-by to obtain pre-composition；
(2) raw rubber is put into mediate in mixer and is plasticated, heating temperature to 120 DEG C, mixing speed 105r/min is stirred
Mixing the time is 15min, is subsequently added into calcirm-fluoride and spray carbon black, is kneaded, mixing time 20min；
(3) it is subsequently added into the resulting pre-composition of step (1) and is stirred mixing together, melting temperature is 145 DEG C, and pressure is
8KN, kneading banbury rotating speed are 110r/min, mixing time 1h；
(4) vulcanized: first carrying out one step cure, one step cure temperature is 175 DEG C, vulcanization time 13min, sulfide stress
For 12Mpa；Post vulcanization is carried out again, and post vulcanization temperature is 240 DEG C, and vulcanization time 11min can be obtained after vulcanization
Finished product.
The processing technology of the explosion-proof viton seal ring of valve above-mentioned, comprising the following steps:
(1) it premixes: vulcanizing agent, crosslinking agent, inner pattern releasing agent applicable, acid absorbent, cure initiator and reinforcing agent is mixed in blender
It closes uniformly, it is stand-by to obtain pre-composition；
(2) raw rubber is put into mediate in mixer and is plasticated, heating temperature to 130 DEG C, mixing speed 110r/min is stirred
Mixing the time is 20min, is subsequently added into calcirm-fluoride and spray carbon black, is kneaded, mixing time 25min；
(3) it is subsequently added into the resulting pre-composition of step (1) and is stirred mixing together, melting temperature is 165 DEG C, and pressure is
11KN, kneading banbury rotating speed are 120r/min, mixing time 2h；
(4) vulcanized: first carrying out one step cure, one step cure temperature is 185 DEG C, vulcanization time 18min, sulfide stress
For 14Mpa；Post vulcanization is carried out again, and post vulcanization temperature is 260 DEG C, and vulcanization time 13min can be obtained after vulcanization
Finished product.
It is using technical solution of the present invention beneficial effect: according to the technical solution of the present invention, 170 is selected in the invention
The fluorubber of Buddhist nun changes traditional seal using nitrile rubber and binary fluorine rubber and is all unable to satisfy use as raw rubber material
It is required that the shortcomings that, and it is aided with peroxide systems in the invention, 990 original charcoals are substituted using calcirm-fluoride and spray carbon black
It is black, to improve the hardness of rubber compound；Shore hardness in the manufacturing process of the viton seal ring after one step cure is 93,
Shore hardness after post vulcanization reaches 97, and tensile strength reaches 16Mpa, elongation rate of tensile failure 170%, obtained by the invention
Sealing ring wear-resisting property and crushing resistance have obtained great promotion, reduce scrappage and application risk, and manufacturing process is simple,
Facilitate operation, and obtained the approval of client, in circumference valve group and the good valve Deng Duojia valve enterprise in Zhejiang batch
Amount uses.
Specific embodiment
Embodiment 1
The present embodiment provides a kind of explosion-proof viton seal rings of valve, which includes the raw material of following parts by weight:
Raw rubber: 100 parts,
Vulcanizing agent: 2 parts,
Crosslinking agent: 4 parts,
Inner pattern releasing agent applicable: 1 part,
Acid absorbent: 1 part,
Calcirm-fluoride: 10 parts,
Spray carbon black: 11 parts,
Cure initiator: 3 parts,
Reinforcing agent: 6 parts；
Raw rubber uses Mooney viscosity for 170 fluorubber, and vulcanizing agent is using cumyl peroxide；Crosslinking agent uses three acrylic
Isocyanuric acid ester；Inner pattern releasing agent applicable uses zinc stearate；Acid absorbent uses calcium hydroxide, and reinforcing agent is the raw material by following weight parts
Composition: polypropylene (T30S) powder: 11 parts, hexagonal boron nitride: 8 parts, alum powder: 1 part, ethylene group bis-stearamides: 5 parts, eucalyptus
Tree oil: 9 parts, Imarcaptoacetate dioctyltin: 10 parts, Sodium Polyacrylate: 3 parts；
The processing technology of the explosion-proof viton seal ring of above-mentioned valve, comprising the following steps:
(1) it premixes: vulcanizing agent, crosslinking agent, inner pattern releasing agent applicable, acid absorbent, cure initiator and reinforcing agent is mixed in blender
It closes uniformly, it is stand-by to obtain pre-composition；
(2) raw rubber is put into mediate in mixer and is plasticated, heating temperature to 120 DEG C, mixing speed 105r/min is stirred
Mixing the time is 15min, is subsequently added into calcirm-fluoride and spray carbon black, is kneaded, mixing time 20min；
(3) it is subsequently added into the resulting pre-composition of step (1) and is stirred mixing together, melting temperature is 145 DEG C, and pressure is
8KN, kneading banbury rotating speed are 110r/min, mixing time 1h；
(4) vulcanized: first carrying out one step cure, one step cure temperature is 175 DEG C, vulcanization time 13min, sulfide stress
For 12Mpa；Post vulcanization is carried out again, and post vulcanization temperature is 240 DEG C, and vulcanization time 11min can be obtained after vulcanization
Finished product.
Embodiment 2
The present embodiment provides a kind of explosion-proof viton seal rings of valve, which includes the raw material of following parts by weight:
Raw rubber: 120 parts,
Vulcanizing agent: 4 parts,
Crosslinking agent: 7 parts,
Inner pattern releasing agent applicable: 3 parts,
Acid absorbent: 3 parts,
Calcirm-fluoride: 18 parts,
Spray carbon black: 17 parts,
Cure initiator: 8 parts,
Reinforcing agent: 9 parts；
Raw rubber uses Mooney viscosity for 170 fluorubber, and vulcanizing agent is using cumyl peroxide；Crosslinking agent uses three acrylic
Isocyanuric acid ester；Inner pattern releasing agent applicable uses zinc stearate；Acid absorbent uses calcium hydroxide, and reinforcing agent is the raw material by following weight parts
Composition: polypropylene (T30S) powder: 18 parts, hexagonal boron nitride: 11 parts, alum powder: 6 parts, ethylene group bis-stearamides: 8 parts, eucalyptus
Tree oil: 13 parts, Imarcaptoacetate dioctyltin: 17 parts, Sodium Polyacrylate: 8 parts；
The processing technology of the explosion-proof viton seal ring of above-mentioned valve, comprising the following steps:
(1) it premixes: vulcanizing agent, crosslinking agent, inner pattern releasing agent applicable, acid absorbent, cure initiator and reinforcing agent is mixed in blender
It closes uniformly, it is stand-by to obtain pre-composition；
(2) raw rubber is put into mediate in mixer and is plasticated, heating temperature to 130 DEG C, mixing speed 110r/min is stirred
Mixing the time is 20min, is subsequently added into calcirm-fluoride and spray carbon black, is kneaded, mixing time 25min；
(3) it is subsequently added into the resulting pre-composition of step (1) and is stirred mixing together, melting temperature is 165 DEG C, and pressure is
11KN, kneading banbury rotating speed are 120r/min, mixing time 2h；
(4) vulcanized: first carrying out one step cure, one step cure temperature is 185 DEG C, vulcanization time 18min, sulfide stress
For 14Mpa；Post vulcanization is carried out again, and post vulcanization temperature is 260 DEG C, and vulcanization time 13min can be obtained after vulcanization
Finished product.
Embodiment 3
A kind of explosion-proof viton seal ring of valve provided in this embodiment, the sealing ring including valve sealing part, the sealing ring
Raw material including following parts by weight:
Raw rubber: 110 parts,
Vulcanizing agent: 3 parts,
Crosslinking agent: 5 parts,
Inner pattern releasing agent applicable: 2 parts,
Acid absorbent: 2 parts,
Calcirm-fluoride: 15 parts,
Spray carbon black: 15 parts,
Cure initiator: 5 parts,
Reinforcing agent: 7 parts；
Raw rubber uses Mooney viscosity for 170 fluorubber, and vulcanizing agent is using cumyl peroxide；Crosslinking agent uses three acrylic
Isocyanuric acid ester；Inner pattern releasing agent applicable uses zinc stearate；Acid absorbent uses calcium hydroxide, and reinforcing agent is the raw material by following weight parts
Composition: polypropylene (T30S) powder: 13 parts, hexagonal boron nitride: 10 parts, alum powder: 3 parts, ethylene group bis-stearamides:: 6 parts,
Eucalyptus oil: 12 parts, Imarcaptoacetate dioctyltin: 13 parts, Sodium Polyacrylate: 5 parts；
The processing technology of the explosion-proof viton seal ring of valve, comprising the following steps:
(1) it premixes: vulcanizing agent, crosslinking agent, inner pattern releasing agent applicable, acid absorbent, cure initiator and reinforcing agent is mixed in blender
It closes uniformly, it is stand-by to obtain pre-composition；
(2) raw rubber is put into mediate in mixer and is plasticated, heating temperature to 125 DEG C, mixing speed 108r/min is stirred
Mixing the time is 18min, is subsequently added into calcirm-fluoride and spray carbon black, is kneaded, mixing time 23min；
(3) it is subsequently added into the resulting pre-composition of step (1) and is stirred mixing together, melting temperature is 150 DEG C, and pressure is
10KN, kneading banbury rotating speed are 115r/min, mixing time 1.5h；
(4) vulcanized: first carrying out one step cure, one step cure temperature is 180 DEG C, vulcanization time 15min, sulfide stress
For 13Mpa；Post vulcanization is carried out again, and post vulcanization temperature is 250 DEG C, and vulcanization time 12min can be obtained after vulcanization
Finished product.
In addition to the implementation, the present invention can also have other embodiments.It is all to use equivalent substitution or equivalent transformation shape
At technical solution, fall within the scope of protection required by the present invention.
Claims (9)
1. a kind of explosion-proof viton seal ring of valve, the sealing ring including valve sealing part, it is characterised in that: the sealing ring packet
Include the raw material of following parts by weight:
Raw rubber: 100-120 parts,
Vulcanizing agent: 2-4 parts,
Crosslinking agent: 4-7 parts,
Inner pattern releasing agent applicable: 1-3 parts,
Acid absorbent: 1-3 parts,
Calcirm-fluoride: 10-18 parts,
Spray carbon black: 11-17 parts,
Cure initiator: 3-8 parts,
Reinforcing agent: 6-9 parts.
2. the explosion-proof viton seal ring of valve according to claim 1, it is characterised in that: the raw rubber uses Mooney
The fluorubber that viscosity is 170.
3. the explosion-proof viton seal ring of valve according to claim 1, it is characterised in that: the vulcanizing agent used
Aoxidize diisopropylbenzene (DIPB)；The crosslinking agent uses three acrylic isocyanuric acid esters；The inner pattern releasing agent applicable uses zinc stearate；Institute
The acid absorbent stated uses calcium hydroxide.
4. the explosion-proof viton seal ring of valve according to claim 1, it is characterised in that: the reinforcing agent is under
State parts by weight raw material composition: polypropylene (T30S) powder: 11-18 parts, hexagonal boron nitride: 8-11 parts, alum powder: 1-6 parts, second
Support group bis-stearamides: 5-8 parts, eucalyptus oil: 9-13 parts, Imarcaptoacetate dioctyltin: 10-17 parts, polypropylene
Sour sodium: 3-8 parts.
5. the explosion-proof viton seal ring of valve according to claim 1, it is characterised in that: the sealing ring includes following heavy
Measure the raw material of number:
Raw rubber: 100 parts,
Vulcanizing agent: 2 parts,
Crosslinking agent: 4 parts,
Inner pattern releasing agent applicable: 1 part,
Acid absorbent: 1 part,
Calcirm-fluoride: 10 parts,
Spray carbon black: 11 parts,
Cure initiator: 3 parts,
Reinforcing agent: 6 parts.
6. the explosion-proof viton seal ring of valve according to claim 1, it is characterised in that: the sealing ring includes following heavy
Measure the raw material of number:
Raw rubber: 120 parts,
Vulcanizing agent: 4 parts,
Crosslinking agent: 7 parts,
Inner pattern releasing agent applicable: 3 parts,
Acid absorbent: 3 parts,
Calcirm-fluoride: 18 parts,
Spray carbon black: 17 parts,
Cure initiator: 8 parts,
Reinforcing agent: 9 parts.
7. a kind of valve processing technology of explosion-proof viton seal ring, which is equipped with any power in claim 1-6
Benefit requires the explosion-proof viton seal ring of valve, which is characterized in that the processing technology the following steps are included:
(1) it premixes: vulcanizing agent, crosslinking agent, inner pattern releasing agent applicable, acid absorbent, cure initiator and reinforcing agent is mixed in blender
It closes uniformly, it is stand-by to obtain pre-composition；
(2) raw rubber investment is mediated and is plasticated in mixer, heating temperature is to 120-130 DEG C, mixing speed 105-
110r/min, mixing time 15-20min are subsequently added into calcirm-fluoride and spray carbon black, are kneaded, mixing time 20-
25min；
(3) it is subsequently added into the resulting pre-composition of step (1) and is stirred mixing together, melting temperature is 145-165 DEG C, pressure
For 8-11KN, kneading banbury rotating speed is 110-120r/min, mixing time 1-2h；
(4) vulcanized: first carrying out one step cure, one step cure temperature is 175-185 DEG C, vulcanization time 13-18min, sulphur
Change pressure is 12-14Mpa；Post vulcanization is carried out again, and post vulcanization temperature is 240-260 DEG C, vulcanization time 11-13min, sulphur
Finished product can be obtained after change.
8. the valve according to claim 7 processing technology of explosion-proof viton seal ring, it is characterised in that: the processing work
Skill the following steps are included:
(1) it premixes: vulcanizing agent, crosslinking agent, inner pattern releasing agent applicable, acid absorbent, cure initiator and reinforcing agent is mixed in blender
It closes uniformly, it is stand-by to obtain pre-composition；
(2) raw rubber is put into mediate in mixer and is plasticated, heating temperature to 120 DEG C, mixing speed 105r/min is stirred
Mixing the time is 15min, is subsequently added into calcirm-fluoride and spray carbon black, is kneaded, mixing time 20min；
(3) it is subsequently added into the resulting pre-composition of step (1) and is stirred mixing together, melting temperature is 145 DEG C, and pressure is
8KN, kneading banbury rotating speed are 110r/min, mixing time 1h；
(4) vulcanized: first carrying out one step cure, one step cure temperature is 175 DEG C, vulcanization time 13min, sulfide stress
For 12Mpa；Post vulcanization is carried out again, and post vulcanization temperature is 240 DEG C, and vulcanization time 11min can be obtained after vulcanization
Finished product.
9. the valve according to claim 7 processing technology of explosion-proof viton seal ring, it is characterised in that: the processing work
Skill the following steps are included:
(1) it premixes: vulcanizing agent, crosslinking agent, inner pattern releasing agent applicable, acid absorbent, cure initiator and reinforcing agent is mixed in blender
It closes uniformly, it is stand-by to obtain pre-composition；
(2) raw rubber is put into mediate in mixer and is plasticated, heating temperature to 130 DEG C, mixing speed 110r/min is stirred
Mixing the time is 20min, is subsequently added into calcirm-fluoride and spray carbon black, is kneaded, mixing time 25min；
(3) it is subsequently added into the resulting pre-composition of step (1) and is stirred mixing together, melting temperature is 165 DEG C, and pressure is
11KN, kneading banbury rotating speed are 120r/min, mixing time 2h；
(4) vulcanized: first carrying out one step cure, one step cure temperature is 185 DEG C, vulcanization time 18min, sulfide stress
For 14Mpa；Post vulcanization is carried out again, and post vulcanization temperature is 260 DEG C, and vulcanization time 13min can be obtained after vulcanization
Finished product.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810861903.7A CN109181169A (en) | 2018-08-01 | 2018-08-01 | A kind of valve explosion-proof viton seal ring and its processing technology |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810861903.7A CN109181169A (en) | 2018-08-01 | 2018-08-01 | A kind of valve explosion-proof viton seal ring and its processing technology |
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| CN109181169A true CN109181169A (en) | 2019-01-11 |
Family
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|---|---|---|---|
| CN201810861903.7A Pending CN109181169A (en) | 2018-08-01 | 2018-08-01 | A kind of valve explosion-proof viton seal ring and its processing technology |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN110951194A (en) * | 2019-12-12 | 2020-04-03 | 四川福翔科技有限公司 | Sealing ring for oil-gas drilling machine |
| CN113878915A (en) * | 2021-10-09 | 2022-01-04 | 安徽永正密封件有限公司 | Processing technology of rubber sealing rubber ring for multi-angle socket connection of pipeline |
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| CN110951194A (en) * | 2019-12-12 | 2020-04-03 | 四川福翔科技有限公司 | Sealing ring for oil-gas drilling machine |
| CN113878915A (en) * | 2021-10-09 | 2022-01-04 | 安徽永正密封件有限公司 | Processing technology of rubber sealing rubber ring for multi-angle socket connection of pipeline |
| CN113878915B (en) * | 2021-10-09 | 2023-12-08 | 安徽永正密封件有限公司 | Processing technology of rubber sealing rubber ring for multi-angle socket connection of pipeline |
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Application publication date: 20190111 |
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