CN108456424A - A kind of seal gasket and preparation method thereof of anti-salt corrosion - Google Patents
A kind of seal gasket and preparation method thereof of anti-salt corrosion Download PDFInfo
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- CN108456424A CN108456424A CN201810102837.5A CN201810102837A CN108456424A CN 108456424 A CN108456424 A CN 108456424A CN 201810102837 A CN201810102837 A CN 201810102837A CN 108456424 A CN108456424 A CN 108456424A
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- parts
- seal gasket
- glue
- fluorubber
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Classifications
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L83/00—Compositions of macromolecular compounds obtained by reactions forming in the main chain of the macromolecule a linkage containing silicon with or without sulfur, nitrogen, oxygen or carbon only; Compositions of derivatives of such polymers
- C08L83/04—Polysiloxanes
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29B—PREPARATION OR PRETREATMENT OF THE MATERIAL TO BE SHAPED; MAKING GRANULES OR PREFORMS; RECOVERY OF PLASTICS OR OTHER CONSTITUENTS OF WASTE MATERIAL CONTAINING PLASTICS
- B29B7/00—Mixing; Kneading
- B29B7/30—Mixing; Kneading continuous, with mechanical mixing or kneading devices
- B29B7/58—Component parts, details or accessories; Auxiliary operations
- B29B7/72—Measuring, controlling or regulating
- B29B7/728—Measuring data of the driving system, e.g. torque, speed, power, vibration
-
- 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
- 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
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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)
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Compositions Of Macromolecular Compounds (AREA)
- Sealing Material Composition (AREA)
Abstract
The present invention provides a kind of seal gaskets of anti-salt corrosion, including silicon rubber, fluorubber, antioxidant D NP, anti-aging agent CMA, white carbon, calcium carbonate, ferric oxalate, accelerant NOBS, diphenylguanidine PTH, t-butyl perbenzoate, benzoyl peroxide, epoxy resin, the preparation method of the seal gasket：（1）Fluorubber modeling is practiced；（2）Fluorubber after modeling is practiced is mixed in mixing in open mill with silicon rubber and remaining component；（3）To rubber compound back mixing；（4）Extrusion forming simultaneously vulcanizes, and obtains seal gasket.The seal gasket has the advantages that surface is smooth, resistance to corrosion is strong, with long service life, the seal gasket in preparation process, have the advantages that preparation process is simple, the component that uses rationally, production safety.
Description
Technical field
The present invention relates to seal gasket technical field, specially a kind of seal gasket and preparation method thereof of anti-salt corrosion.
Background technology
Seal gasket, which is applied to the main function in equipment, to be sealed and reduces in equipment between the device in equipment
Device abrasion, when in the environment that equipment is in moist, salt soluble in water can generate the seal gasket in equipment rotten
Erosion, corrosiveness lead to the situations such as salt, the seal gasket rough surface of seal gasket surface attachment crystallization, these situations are not only
Sealing that can be between device has an impact, and can also generate abrasion and corrosion to device itself during equipment shakes, in addition,
Seal gasket rough surface causes the leakproofness between device to be deteriorated, therefore, how to provide a kind of surface it is smooth, in wet environment energy
Enough seal gaskets not being corroded increasingly are concerned.
Invention content
In consideration of it, the present invention provides a kind of seal gasket and preparation method thereof of anti-salt corrosion, which has
Surface is smooth, resistance to corrosion is strong, advantage with long service life, which has preparation process letter in preparation process
The single, component that uses rationally, production safety the advantages of.
On the basis of existing technology, the present invention provides a kind of seal gaskets of anti-salt corrosion, including following weight parts
Several components：75 ~ 85 parts of silicon rubber, 15 ~ 25 parts of fluorubber, 1 ~ 2 part of antioxidant D NP, 1.5 ~ 2.5 parts of anti-aging agent CMA, hard charcoal
Black 20 ~ 40 parts, 3 ~ 7 parts of calcium carbonate, 1 ~ 3 part of ferric oxalate, 0.7 ~ 1.3 part of accelerant NOBS, 0.3 ~ 0.7 part of diphenylguanidine PTH,
1.5 ~ 2.5 parts of t-butyl perbenzoate, 0.5 ~ 1.5 part of benzoyl peroxide, 0.3 ~ 0.7 part of epoxy resin.
Preferably, the seal gasket of above-mentioned anti-salt corrosion includes the component of following portions by weight：80 parts of silicon rubber, fluorubber
20 parts, 1.5 parts of antioxidant D NP, 2 parts of anti-aging agent CMA, 30 parts of white carbon, 5 parts of calcium carbonate, 2 parts of ferric oxalate, accelerant NOBS
1 part, 0.5 part of diphenylguanidine PTH, 2 parts of t-butyl perbenzoate, 1 part of benzoyl peroxide, 0.5 part of epoxy resin.
The preparation method of the seal gasket of above-mentioned anti-salt corrosion, steps are as follows：
（1）Fluorubber after drying is subjected to stripping and slicing, blob of viscose magnitude range is 10 ~ 20kg, moulds and practices in input mixer, moulds and practice temperature
Degree is 120 ~ 140 DEG C, obtains modeling and practices glue, park 20 ~ for 24 hours, it is spare；Preferably, it is 130 DEG C to mould white silk temperature, moulds and practices parking for glue
Time is 22h；
（2）Modeling is practiced in glue input open mill, and puts into silicon rubber, starts roll-in, fluorubber is made to be uniformly mixed with silicon rubber, adjust
Roll spacing ranging from 5 ~ 7mm is saved, the temperature range of preliminary roller is 45 ~ 55 DEG C, and the temperature range of back roller is 35 ~ 45 DEG C, and roller speed is ranging from
13~15r/min；Then accelerant NOBS, diphenylguanidine PTH, antioxidant D NP, anti-aging agent part are added thereto, continues to be kneaded,
In mixing, white carbon, calcium carbonate, ferric oxalate are continuously added, continues to be kneaded, obtains rubber compound, bottom sheet cools down after mixing, parks 20
~ 28h, it is spare；Preferably, the roll spacing of mill is 6mm, and the temperature of preliminary roller is 50 DEG C, and the temperature of back roller is 40 DEG C, and roller speed is 14r/
min；
（3）Rubber compound after cooling is put into open mill, t-butyl perbenzoate, benzoyl peroxide and ring are added thereto
Oxygen resin obtains back mixing glue to rubber compound back mixing, then turns over the cooling of glue bottom sheet, spare after parking 20 ~ 28h；Preferably, it is kneaded
It is for 24 hours that glue, which turns over the storage period after glue bottom sheet,；
（4）Back mixing glue after cooling is put into extruder and is extruded into adhesive tape, the adhesive tape of extrusion is then entered into mold forming, after molding
Rubber cushion park 6 ~ 10h, the rubber cushion after then parking vulcanizes on vulcanizing press, obtain seal gasket；Preferably, rubber cushion
Storage period is 8h.
Compared with prior art, beneficial effects of the present invention：
1, it selects silicon rubber and fluorubber as base compound, has the advantages that cost-effective；By the way that fluorubber is carried out modeling white silk,
The mobility for improving fluorubber makes sizing material be uniformly mixed convenient for being uniformly mixed with silicon rubber, to obtain uniform quality, unanimously
Seal gasket.
2, by adjusting the roll spacing of open mill, preceding roll temperature, rear roll temperature and roller speed, accelerant NOBS, diphenylguanidine PTH,
Antioxidant D NP, anti-aging agent CMA, white carbon, calcium carbonate and ferric oxalate are uniformly dispersed, mixed well conducive to silicon rubber and fluorubber,
It is kneaded, vulcanization, keeps the seal gasket surface of acquisition smooth, reduce salt in wet air and adhere to, extend the use of seal gasket
Service life.
Specific implementation mode
The present invention is described in detail With reference to embodiment, and the advantages and features of the present invention will be with retouching
It states and apparent.But examples are merely exemplary, and it is not intended to limit the scope of the present invention in any way.People in the art
Member is it should be understood that without departing from the spirit and scope of the invention, can repair technical scheme of the present invention details
Change or replace, but these modifications and replacement each fall within protection scope of the present invention.
Embodiment 1：
A kind of seal gasket of anti-salt corrosion, includes the component of following portions by weight：80 parts of silicon rubber, is prevented always 20 parts of fluorubber
1.5 parts of agent DNP, 2 parts of anti-aging agent CMA, 30 parts of white carbon, 5 parts of calcium carbonate, 2 parts of ferric oxalate, 1 part of accelerant NOBS, promote
0.5 part of agent DPTH, 2 parts of t-butyl perbenzoate, 1 part of benzoyl peroxide, 0.5 part of epoxy resin.
The preparation method of the seal gasket of above-mentioned anti-salt corrosion, steps are as follows：
（1）Fluorubber after drying is subjected to stripping and slicing, blob of viscose magnitude range is 10 ~ 20kg, moulds and practices in input mixer, moulds and practice temperature
Degree is 130 DEG C, obtains modeling and practices glue, parks 22h, spare；
（2）Modeling is practiced in glue input open mill, and puts into silicon rubber, starts roll-in, fluorubber is made to be uniformly mixed with silicon rubber, adjust
Roll spacing ranging from 6mm is saved, the temperature range of preliminary roller is 50 DEG C, and the temperature range of back roller is 40 DEG C, roller speed ranging from 14r/min；
Then accelerant NOBS, diphenylguanidine PTH, antioxidant D NP, anti-aging agent part are added thereto, continues to be kneaded, in mixing, continues
White carbon, calcium carbonate, ferric oxalate is added, continues to be kneaded, obtains rubber compound, bottom sheet cools down after mixing, parks for 24 hours, spare；
（3）Rubber compound after cooling is put into open mill, t-butyl perbenzoate, benzoyl peroxide and ring are added thereto
Oxygen resin obtains back mixing glue to rubber compound back mixing, then turns over the cooling of glue bottom sheet, spare after parking for 24 hours；
（4）Back mixing glue after cooling is put into extruder and is extruded into adhesive tape, the adhesive tape of extrusion is then entered into mold forming, after molding
Rubber cushion park 8h, the rubber cushion after then parking vulcanizes on vulcanizing press, obtain seal gasket.
Comparative example 1：
A kind of seal gasket includes the component of following portions by weight：75 ~ 85 parts of silicon rubber, 15 ~ 25 parts of fluorubber, antioxidant D NP
1 ~ 2 part, 20 ~ 40 parts of white carbon, 3 ~ 7 parts of calcium carbonate, 0.7 ~ 1.3 part of accelerant NOBS, 1.5 ~ 2.5 parts of t-butyl perbenzoate,
0.3 ~ 0.7 part of epoxy resin.
The preparation method of above-mentioned seal gasket, steps are as follows：
（1）By silicon rubber and fluorubber stripping and slicing, input open mill is interior to be kneaded, and antioxidant D NP, white carbon, calcium carbonate and rush is added
Into agent NOBS, continue to be kneaded, obtain rubber compound, bottom sheet cooling is parked for 24 hours, spare；
（2）Rubber compound after cooling is put into open mill, t-butyl perbenzoate and epoxy resin are added thereto, to being kneaded
Glue back mixing obtains back mixing glue, then turns over the cooling of glue bottom sheet, spare after parking for 24 hours；
（3）Back mixing glue after cooling is put into extruder and is extruded into adhesive tape, the adhesive tape of extrusion is then entered into mold forming, after molding
Rubber cushion park 8h, the rubber cushion after then parking vulcanizes on vulcanizing press, obtain seal gasket.
Embodiment 2：
A kind of seal gasket of anti-salt corrosion, includes the component of following portions by weight：75 parts of silicon rubber, is prevented always 25 parts of fluorubber
1 part of agent DNP, 1.5 parts of anti-aging agent CMA, 20 parts of white carbon, 3 parts of calcium carbonate, 1 part of ferric oxalate, 0.7 part of accelerant NOBS, promote
Into 0.3 part of agent DPTH, 1.5 parts of t-butyl perbenzoate, 0.5 part of benzoyl peroxide, 0.3 part of epoxy resin.
The preparation method of the seal gasket of above-mentioned anti-salt corrosion, steps are as follows：
（1）Fluorubber after drying is subjected to stripping and slicing, blob of viscose magnitude range is 10 ~ 20kg, moulds and practices in input mixer, moulds and practice temperature
Degree is 120 DEG C, obtains modeling and practices glue, parks 20h, spare；
（2）Modeling is practiced in glue input open mill, and puts into silicon rubber, starts roll-in, fluorubber is made to be uniformly mixed with silicon rubber, adjust
Section roll spacing is 5mm, and the temperature of preliminary roller is 45 DEG C, and the temperature of back roller is 35 DEG C, and roller speed is 13r/min；Then it is added and promotees thereto
Into agent NOBS, diphenylguanidine PTH, antioxidant D NP, anti-aging agent part, continue to be kneaded, in mixing, continuously adds white carbon, carbonic acid
Calcium, ferric oxalate continue to be kneaded, and obtain rubber compound, and bottom sheet cools down after mixing, parks 20h, spare；
（3）Rubber compound after cooling is put into open mill, t-butyl perbenzoate, benzoyl peroxide and ring are added thereto
Oxygen resin obtains back mixing glue to rubber compound back mixing, then turns over the cooling of glue bottom sheet, spare after parking 20h；
（4）Back mixing glue after cooling is put into extruder and is extruded into adhesive tape, the adhesive tape of extrusion is then entered into mold forming, after molding
Rubber cushion park 6h, the rubber cushion after then parking vulcanizes on vulcanizing press, obtain seal gasket.
Embodiment 3：
A kind of seal gasket of anti-salt corrosion, includes the component of following portions by weight：85 parts of silicon rubber, is prevented always 25 parts of fluorubber
2 parts of agent DNP, 2.5 parts of anti-aging agent CMA, 40 parts of white carbon, 7 parts of calcium carbonate, 3 parts of ferric oxalate, 1.3 parts of accelerant NOBS, promote
Into 0.7 part of agent DPTH, 2.5 parts of t-butyl perbenzoate, 1.5 parts of benzoyl peroxide, 0.7 part of epoxy resin.
The preparation method of the seal gasket of above-mentioned anti-salt corrosion, steps are as follows：
（1）Fluorubber after drying is subjected to stripping and slicing, blob of viscose magnitude range is 10 ~ 20kg, moulds and practices in input mixer, moulds and practice temperature
Degree is 140 DEG C, obtains modeling and practices glue, parks for 24 hours, spare；
（2）Modeling is practiced in glue input open mill, and puts into silicon rubber, starts roll-in, fluorubber is made to be uniformly mixed with silicon rubber, adjust
Roll spacing ranging from 7mm is saved, the temperature of preliminary roller is 55 DEG C, and the temperature of back roller is 45 DEG C, and roller speed is 15r/min；Then add thereto
Enter accelerant NOBS, diphenylguanidine PTH, antioxidant D NP, anti-aging agent part, continue to be kneaded, in mixing, continuously add white carbon,
Calcium carbonate, ferric oxalate continue to be kneaded, and obtain rubber compound, and bottom sheet cools down after mixing, parks 28h, spare；
（3）Rubber compound after cooling is put into open mill, t-butyl perbenzoate, benzoyl peroxide and ring are added thereto
Oxygen resin obtains back mixing glue to rubber compound back mixing, then turns over the cooling of glue bottom sheet, spare after parking 28h；
（4）Back mixing glue after cooling is put into extruder and is extruded into adhesive tape, the adhesive tape of extrusion is then entered into mold forming, after molding
Rubber cushion park 10h, the rubber cushion after then parking vulcanizes on vulcanizing press, obtain seal gasket.
The seal gasket that seal gasket and comparative example 1 that embodiment 1 ~ 3 obtains obtain is placed in 38 ‰ sodium chloride water
Solution is observed the situation of seal gasket, can be seen respectively in 5d, 10d, 20d, 30d, 60d in immersing sodium-chloride water solution
Go out, the seal gasket surface of embodiment 1 ~ 3 is smooth, and nothing salts out, no breakage；The seal gasket surface that comparative example 1 obtains is slightly thick
Rough and surface is attached with salt crystal, this shows under the same conditions, and seal gasket prepared by method provided by the invention has
More preferably anti-salt corrosion performance.
Claims (8)
1. a kind of seal gasket of anti-salt corrosion, which is characterized in that the component including following portions by weight：75 ~ 85 parts of silicon rubber,
15 ~ 25 parts of fluorubber, 1 ~ 2 part of antioxidant D NP, 1.5 ~ 2.5 parts of anti-aging agent CMA, 20 ~ 40 parts of white carbon, 3 ~ 7 parts of calcium carbonate,
1 ~ 3 part of ferric oxalate, 0.7 ~ 1.3 part of accelerant NOBS, 0.3 ~ 0.7 part of diphenylguanidine PTH, t-butyl perbenzoate 1.5 ~ 2.5
Part, 0.5 ~ 1.5 part of benzoyl peroxide, 0.3 ~ 0.7 part of epoxy resin.
2. the seal gasket of anti-salt corrosion as described in claim 1, which is characterized in that the component including following portions by weight：
80 parts of silicon rubber, 20 parts of fluorubber, 1.5 parts of antioxidant D NP, 2 parts of anti-aging agent CMA, 30 parts of white carbon, 5 parts of calcium carbonate, oxalic acid
2 parts of iron, 1 part of accelerant NOBS, 0.5 part of diphenylguanidine PTH, 2 parts of t-butyl perbenzoate, 1 part of benzoyl peroxide, epoxy
0.5 part of resin.
3. the preparation method of the seal gasket of anti-salt corrosion as claimed in claim 1 or 2, which is characterized in that steps are as follows：
（1）Fluorubber after drying is subjected to stripping and slicing, blob of viscose magnitude range is 10 ~ 20kg, moulds and practices in input mixer, moulds and practice temperature
Degree is 120 ~ 140 DEG C, obtains modeling and practices glue, park 20 ~ for 24 hours, it is spare；
（2）Modeling is practiced in glue input open mill, and puts into silicon rubber, starts roll-in, fluorubber is made to be uniformly mixed with silicon rubber, adjust
Roll spacing ranging from 5 ~ 7mm is saved, the temperature range of preliminary roller is 45 ~ 55 DEG C, and the temperature range of back roller is 35 ~ 45 DEG C, and roller speed is ranging from
13~15r/min；Then accelerant NOBS, diphenylguanidine PTH, antioxidant D NP, anti-aging agent part are added thereto, continues to be kneaded,
In mixing, white carbon, calcium carbonate, ferric oxalate are continuously added, continues to be kneaded, obtains rubber compound, bottom sheet cools down after mixing, parks 20
~ 28h, it is spare；
（3）Rubber compound after cooling is put into open mill, t-butyl perbenzoate, benzoyl peroxide and ring are added thereto
Oxygen resin obtains back mixing glue to rubber compound back mixing, then turns over the cooling of glue bottom sheet, spare after parking 20 ~ 28h；
（4）Back mixing glue after cooling is put into extruder and is extruded into adhesive tape, the adhesive tape of extrusion is then entered into mold forming, after molding
Rubber cushion park 6 ~ 10h, the rubber cushion after then parking vulcanizes on vulcanizing press, obtain seal gasket.
4. the preparation method of the seal gasket of acid-resistance gas attack as claimed in claim 3, which is characterized in that in step
（1）In, it is 130 DEG C to mould white silk temperature, and the storage period for moulding white silk glue is 22h.
5. the preparation method of the seal gasket of acid-resistance gas attack as claimed in claim 3, which is characterized in that in step
（2）In, the roll spacing of open mill is 6mm, and the temperature of preliminary roller is 50 DEG C, and the temperature of back roller is 40 DEG C, and roller speed is 14r/min.
6. the preparation method of the seal gasket of acid-resistance gas attack as claimed in claim 3, which is characterized in that in step
（2）In, it is for 24 hours that rubber compound, which turns over the storage period after glue bottom sheet,.
7. the preparation method of the seal gasket of acid-resistance gas attack as claimed in claim 3, which is characterized in that in step
（3）In, it is for 24 hours that back mixing glue, which turns over the storage period after glue bottom sheet,.
8. the preparation method of the seal gasket of acid-resistance gas attack as claimed in claim 3, which is characterized in that in step
（4）In, the storage period of rubber cushion is 8h.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810102837.5A CN108456424A (en) | 2018-02-01 | 2018-02-01 | A kind of seal gasket and preparation method thereof of anti-salt corrosion |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810102837.5A CN108456424A (en) | 2018-02-01 | 2018-02-01 | A kind of seal gasket and preparation method thereof of anti-salt corrosion |
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| Publication Number | Publication Date |
|---|---|
| CN108456424A true CN108456424A (en) | 2018-08-28 |
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ID=63238643
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| CN201810102837.5A Pending CN108456424A (en) | 2018-02-01 | 2018-02-01 | A kind of seal gasket and preparation method thereof of anti-salt corrosion |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109294126A (en) * | 2018-09-27 | 2019-02-01 | 安徽龙川橡塑科技有限公司 | A kind of 0 type circle of ptfe fluoropolymer and its production technology |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20070010613A1 (en) * | 2004-07-20 | 2007-01-11 | Nichias Corporation | Gasket sheet and method for manufacturing same |
| CN103351559A (en) * | 2013-06-24 | 2013-10-16 | 安徽春辉仪表线缆集团有限公司 | Tetrafluoroethylene-propylene rubber/silicone rubber/chloroprene rubber composite sealing pad and preparation method thereof |
| CN106084499A (en) * | 2016-07-25 | 2016-11-09 | 崔贵民 | The endless belt rubberizing of thermal resistance and acid-alkali resistance paper tube, preparation method and paper tube endless belt |
-
2018
- 2018-02-01 CN CN201810102837.5A patent/CN108456424A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20070010613A1 (en) * | 2004-07-20 | 2007-01-11 | Nichias Corporation | Gasket sheet and method for manufacturing same |
| CN103351559A (en) * | 2013-06-24 | 2013-10-16 | 安徽春辉仪表线缆集团有限公司 | Tetrafluoroethylene-propylene rubber/silicone rubber/chloroprene rubber composite sealing pad and preparation method thereof |
| CN106084499A (en) * | 2016-07-25 | 2016-11-09 | 崔贵民 | The endless belt rubberizing of thermal resistance and acid-alkali resistance paper tube, preparation method and paper tube endless belt |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109294126A (en) * | 2018-09-27 | 2019-02-01 | 安徽龙川橡塑科技有限公司 | A kind of 0 type circle of ptfe fluoropolymer and its production technology |
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Application publication date: 20180828 |
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