CN112898647A - Oil-resistant and aging-resistant rubber oil cylinder plug and processing method thereof - Google Patents
Oil-resistant and aging-resistant rubber oil cylinder plug and processing method thereof Download PDFInfo
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- CN112898647A CN112898647A CN202011475882.9A CN202011475882A CN112898647A CN 112898647 A CN112898647 A CN 112898647A CN 202011475882 A CN202011475882 A CN 202011475882A CN 112898647 A CN112898647 A CN 112898647A
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- parts
- resistant
- rubber
- aging
- resin
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- 229920001971 elastomer Polymers 0.000 title claims abstract description 28
- 239000005060 rubber Substances 0.000 title claims abstract description 28
- 230000032683 aging Effects 0.000 title claims abstract description 18
- 238000003672 processing method Methods 0.000 title claims abstract description 8
- 239000003795 chemical substances by application Substances 0.000 claims abstract description 43
- IANQTJSKSUMEQM-UHFFFAOYSA-N 1-benzofuran Chemical compound C1=CC=C2OC=CC2=C1 IANQTJSKSUMEQM-UHFFFAOYSA-N 0.000 claims abstract description 40
- XLOMVQKBTHCTTD-UHFFFAOYSA-N Zinc monoxide Chemical compound [Zn]=O XLOMVQKBTHCTTD-UHFFFAOYSA-N 0.000 claims abstract description 40
- DOIRQSBPFJWKBE-UHFFFAOYSA-N dibutyl phthalate Chemical compound CCCCOC(=O)C1=CC=CC=C1C(=O)OCCCC DOIRQSBPFJWKBE-UHFFFAOYSA-N 0.000 claims abstract description 32
- 239000011347 resin Substances 0.000 claims abstract description 26
- 229920005989 resin Polymers 0.000 claims abstract description 26
- 229920000459 Nitrile rubber Polymers 0.000 claims abstract description 22
- 235000021355 Stearic acid Nutrition 0.000 claims abstract description 20
- 230000003712 anti-aging effect Effects 0.000 claims abstract description 20
- 239000006229 carbon black Substances 0.000 claims abstract description 20
- 239000000835 fiber Substances 0.000 claims abstract description 20
- QIQXTHQIDYTFRH-UHFFFAOYSA-N octadecanoic acid Chemical compound CCCCCCCCCCCCCCCCCC(O)=O QIQXTHQIDYTFRH-UHFFFAOYSA-N 0.000 claims abstract description 20
- OQCDKBAXFALNLD-UHFFFAOYSA-N octadecanoic acid Natural products CCCCCCCC(C)CCCCCCCCC(O)=O OQCDKBAXFALNLD-UHFFFAOYSA-N 0.000 claims abstract description 20
- 239000008117 stearic acid Substances 0.000 claims abstract description 20
- 239000011787 zinc oxide Substances 0.000 claims abstract description 20
- XOOUIPVCVHRTMJ-UHFFFAOYSA-L zinc stearate Chemical compound [Zn+2].CCCCCCCCCCCCCCCCCC([O-])=O.CCCCCCCCCCCCCCCCCC([O-])=O XOOUIPVCVHRTMJ-UHFFFAOYSA-L 0.000 claims abstract description 20
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 claims abstract description 13
- 239000000741 silica gel Substances 0.000 claims abstract description 13
- 229910002027 silica gel Inorganic materials 0.000 claims abstract description 13
- 239000002994 raw material Substances 0.000 claims abstract description 4
- 239000000463 material Substances 0.000 claims description 15
- 150000002148 esters Chemical class 0.000 claims description 4
- 238000001816 cooling Methods 0.000 claims description 3
- 238000005520 cutting process Methods 0.000 claims description 3
- 229920000642 polymer Polymers 0.000 claims description 3
- 238000003825 pressing Methods 0.000 claims description 3
- 238000004073 vulcanization Methods 0.000 claims description 3
- 238000005303 weighing Methods 0.000 claims description 3
- 238000007789 sealing Methods 0.000 abstract description 8
- 230000035699 permeability Effects 0.000 abstract description 5
- 230000002035 prolonged effect Effects 0.000 description 4
- 150000001875 compounds Chemical class 0.000 description 2
- 238000004513 sizing Methods 0.000 description 2
- 229920001875 Ebonite Polymers 0.000 description 1
- 230000009471 action Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 230000003993 interaction Effects 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000008569 process Effects 0.000 description 1
- 230000002522 swelling effect Effects 0.000 description 1
Classifications
-
- 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
- C08L9/02—Copolymers with acrylonitrile
-
- 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
- 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
Landscapes
- Chemical & Material Sciences (AREA)
- Health & Medical Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Medicinal Chemistry (AREA)
- Polymers & Plastics (AREA)
- Organic Chemistry (AREA)
- Compositions Of Macromolecular Compounds (AREA)
Abstract
The invention discloses an oil-resistant and aging-resistant rubber oil cylinder plug and a processing method thereof, belonging to the technical field of rubber parts, wherein the raw materials comprise nitrile rubber, carbon black, resin, short fibers, an anti-aging agent, zinc oxide, stearic acid, zinc stearate, high-molecular wax, an accelerator, coumarone, dibutyl phthalate and a vulcanizing agent; the automobile silica gel plug comprises, by weight, 60-80 parts of nitrile-butadiene rubber, 30-60 parts of carbon black, 5-15 parts of resin, 5-10 parts of short fibers, 1-5 parts of an anti-aging agent, 2-8 parts of zinc oxide, 2-8 parts of stearic acid, 1-5 parts of zinc stearate, 1-5 parts of high-molecular wax, 1-5 parts of an accelerator, 2-8 parts of coumarone, 2-10 parts of dibutyl phthalate and 1-5 parts of a vulcanizing agent; the invention solves the problems of poor oil resistance, poor permeability resistance, poor sealing and short service life of the rubber plug in the prior art.
Description
Technical Field
The invention relates to the technical field of rubber parts, in particular to an oil-resistant and aging-resistant rubber oil cylinder plug and a processing method thereof.
Background
The rubber plug is generally hard rubber material and tightly blocks the hole of the oil cylinder under the action of external force. Although the plug can meet the use requirement to a certain extent, the air tightness is poor, and the plug cannot bear the requirement of long-time tightness test. In addition, in the long-time use process, due to the swelling effect, the plug can be loosened due to the interaction force between the plug and the oil cylinder, so that the oil leakage of the oil cylinder hole is caused, and the market requirement cannot be met. The rubber plug used at present is unreasonable in structure, poor in oil resistance, permeability resistance, poor in sealing performance and short in service life, and can not meet the market requirements far away.
Disclosure of Invention
Aiming at the defects of the prior art, the invention aims to provide an oil-resistant and aging-resistant rubber oil cylinder plug and a processing method thereof, and solves the problems of poor oil resistance, poor permeability resistance, poor sealing and short service life of the rubber plug in the prior art.
The purpose of the invention can be realized by the following technical scheme:
an oil-resistant and aging-resistant rubber oil cylinder plug is prepared from raw materials including nitrile rubber, carbon black, resin, short fibers, an anti-aging agent, zinc oxide, stearic acid, zinc stearate, high-molecular wax, an accelerator, coumarone, dibutyl phthalate and a vulcanizing agent; the automobile silica gel plug comprises, by weight, 60-80 parts of nitrile rubber, 30-60 parts of carbon black, 5-15 parts of resin, 5-10 parts of short fibers, 1-5 parts of an anti-aging agent, 2-8 parts of zinc oxide, 2-8 parts of stearic acid, 1-5 parts of zinc stearate, 1-5 parts of high polymer wax, 1-5 parts of an accelerator, 2-8 parts of coumarone, 2-10 parts of dibutyl phthalate and 1-5 parts of a vulcanizing agent.
The automobile silica gel plug comprises, by weight, 60 parts of nitrile rubber, 30 parts of carbon black, 5 parts of resin, 5 parts of short fiber, 1 part of an anti-aging agent, 2 parts of zinc oxide, 2 parts of stearic acid, 1 part of zinc stearate, 1 part of high-molecular wax, 1 part of an accelerator, 2 parts of coumarone, 2 parts of dibutyl ester and 1-5 parts of a vulcanizing agent.
As a preferable scheme of the invention, the automobile silica gel plug comprises, by weight, 70 parts of nitrile rubber, 45 parts of carbon black, 10 parts of resin, 10 parts of short fiber, 3 parts of anti-aging agent, 5 parts of zinc oxide, 5 parts of stearic acid, 3 parts of zinc stearate, 3 parts of high-molecular wax, 3 parts of accelerator, 5 parts of coumarone, 6 parts of dibutyl ester and 3 parts of vulcanizing agent.
According to a preferable scheme of the invention, the automobile silica gel plug comprises, by weight, 680 parts of nitrile-butadiene rubber, 60 parts of carbon black, 15 parts of resin, 10 parts of short fiber, 5 parts of anti-aging agent, 8 parts of zinc oxide, 8 parts of stearic acid, 5 parts of zinc stearate, 5 parts of high-molecular wax, 5 parts of accelerator, 8 parts of coumarone, 10 parts of dibutyl ester and 5 parts of vulcanizing agent.
A processing method of an oil-resistant and aging-resistant rubber oil cylinder plug comprises the following steps:
s1: preparing plug materials by weight parts of 60-80 parts of nitrile butadiene rubber, 30-60 parts of carbon black, 5-15 parts of resin, 5-10 parts of short fibers, 1-5 parts of an anti-aging agent, 2-8 parts of zinc oxide, 2-8 parts of stearic acid, 1-5 parts of zinc stearate, 1-5 parts of high molecular wax, 1-5 parts of an accelerator, 2-8 parts of coumarone, 2-10 parts of dibutyl phthalate and 1-5 parts of a vulcanizing agent;
s2: adding the material of the plug prepared in the S1 into an internal mixer for mixing, wherein the mixing temperature is 11-140 ℃, the mixing pressure is 0.1-0.4 MPa, and the mixing time is 5-15 minutes; after mixing, adding 1-5 parts of vulcanizing agent into an open mill, and finally cooling and standing the lower piece for later use;
s3: setting the vulcanizing temperature of the flat plate, wherein the upper mold is 150-170 ℃, the lower mold is 150-170 ℃, and the mold is placed into a flat vulcanizing machine and heated; after the temperature is raised to the specified temperature, preserving the heat for 30 minutes; cutting the mixed rubber into strips, weighing, putting the strips into a die cavity, starting a machine, and pressing the die; and taking out the product after vulcanization is finished.
The invention has the beneficial effects that:
the invention provides a rubber compound prepared by combining nitrile rubber, resin and two materials. A product produced by high temperature and high pressure using a mold. Because the resin is added into the rubber material, the stiffness of the plug is improved, the sealing performance is improved, the aging resistance is enhanced, and the service life of the product is prolonged. By adopting the technical scheme, as the resin is used in the sizing material, the oil resistance, the aging resistance and the permeability resistance of the plug are greatly improved, the sealing property of the plug is improved, and the service cycle of the plug is further prolonged.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
An oil-resistant and aging-resistant rubber oil cylinder plug is prepared from raw materials including nitrile rubber, carbon black, resin, short fibers, an anti-aging agent, zinc oxide, stearic acid, zinc stearate, high-molecular wax, an accelerator, coumarone, dibutyl phthalate and a vulcanizing agent; the automobile silica gel plug comprises, by weight, 60-80 parts of nitrile rubber, 30-60 parts of carbon black, 5-15 parts of resin, 5-10 parts of short fibers, 1-5 parts of an anti-aging agent, 2-8 parts of zinc oxide, 2-8 parts of stearic acid, 1-5 parts of zinc stearate, 1-5 parts of high polymer wax, 1-5 parts of an accelerator, 2-8 parts of coumarone, 2-10 parts of dibutyl phthalate and 1-5 parts of a vulcanizing agent.
The automobile silica gel plug comprises, by weight, 60 parts of nitrile rubber, 30 parts of carbon black, 5 parts of resin, 5 parts of short fibers, 1 part of an anti-aging agent, 2 parts of zinc oxide, 2 parts of stearic acid, 1 part of zinc stearate, 1 part of high-molecular wax, 1 part of an accelerator, 2 parts of coumarone, 2 parts of dibutyl phthalate and 1-5 parts of a vulcanizing agent.
The automobile silica gel plug comprises, by weight, 70 parts of nitrile rubber, 45 parts of carbon black, 10 parts of resin, 10 parts of short fibers, 3 parts of an anti-aging agent, 5 parts of zinc oxide, 5 parts of stearic acid, 3 parts of zinc stearate, 3 parts of high-molecular wax, 3 parts of an accelerator, 5 parts of coumarone, 6 parts of dibutyl phthalate and 3 parts of a vulcanizing agent.
The automobile silica gel plug comprises, by weight, 680 parts of nitrile rubber, 60 parts of carbon black, 15 parts of resin, 10 parts of short fibers, 5 parts of an anti-aging agent, 8 parts of zinc oxide, 8 parts of stearic acid, 5 parts of zinc stearate, 5 parts of high-molecular wax, 5 parts of an accelerator, 8 parts of coumarone, 10 parts of dibutyl phthalate and 5 parts of a vulcanizing agent.
A processing method of an oil-resistant and aging-resistant rubber oil cylinder plug comprises the following steps:
s1: preparing plug materials by weight parts of 60-80 parts of nitrile butadiene rubber, 30-60 parts of carbon black, 5-15 parts of resin, 5-10 parts of short fibers, 1-5 parts of an anti-aging agent, 2-8 parts of zinc oxide, 2-8 parts of stearic acid, 1-5 parts of zinc stearate, 1-5 parts of high molecular wax, 1-5 parts of an accelerator, 2-8 parts of coumarone, 2-10 parts of dibutyl phthalate and 1-5 parts of a vulcanizing agent;
s2: adding the material of the plug prepared in the S1 into an internal mixer for mixing, wherein the mixing temperature is 11-140 ℃, the mixing pressure is 0.1-0.4 MPa, and the mixing time is 5-15 minutes; after mixing, adding 1-5 parts of vulcanizing agent into an open mill, and finally cooling and standing the lower piece for later use;
s3: setting the vulcanizing temperature of the flat plate, wherein the upper mold is 150-170 ℃, the lower mold is 150-170 ℃, and the mold is placed into a flat vulcanizing machine and heated; after the temperature is raised to the specified temperature, preserving the heat for 30 minutes; cutting the mixed rubber into strips, weighing, putting the strips into a die cavity, starting a machine, and pressing the die; and taking out the product after vulcanization is finished.
Aiming at the problems that in the prior art, the rubber plug used at present is unreasonable in structure, poor in oil resistance, permeation resistance, poor in sealing performance and short in service life, and can not meet the market requirements far away. The invention provides a rubber compound prepared by combining nitrile rubber, resin and two materials. A product produced by high temperature and high pressure using a mold. Because the resin is added into the rubber material, the stiffness of the plug is improved, the sealing performance is improved, the aging resistance is enhanced, and the service life of the product is prolonged.
By adopting the technical scheme, as the resin is used in the sizing material, the oil resistance, the aging resistance and the permeability resistance of the plug are greatly improved, the sealing property of the plug is improved, and the service cycle of the plug is further prolonged.
In the description herein, references to the description of "one embodiment," "an example," "a specific example" or the like are intended to mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, the schematic representations of the terms used above do not necessarily refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.
The foregoing shows and describes the general principles, essential features, and advantages of the invention. It will be understood by those skilled in the art that the present invention is not limited to the embodiments described above, which are described in the specification and illustrated only to illustrate the principle of the present invention, but that various changes and modifications may be made therein without departing from the spirit and scope of the present invention, which fall within the scope of the invention as claimed.
Claims (5)
1. The utility model provides an resistant oily ageing-resistant rubber hydro-cylinder end cap which characterized in that: the raw materials comprise nitrile butadiene rubber, carbon black, resin, short fiber, an anti-aging agent, zinc oxide, stearic acid, zinc stearate, high molecular wax, an accelerator, coumarone, dibutyl ester and a vulcanizing agent; the automobile silica gel plug comprises, by weight, 60-80 parts of nitrile rubber, 30-60 parts of carbon black, 5-15 parts of resin, 5-10 parts of short fibers, 1-5 parts of an anti-aging agent, 2-8 parts of zinc oxide, 2-8 parts of stearic acid, 1-5 parts of zinc stearate, 1-5 parts of high polymer wax, 1-5 parts of an accelerator, 2-8 parts of coumarone, 2-10 parts of dibutyl phthalate and 1-5 parts of a vulcanizing agent.
2. The oil-resistant and aging-resistant rubber oil cylinder plug according to claim 1, characterized in that: the automobile silica gel plug comprises, by weight, 60 parts of nitrile rubber, 30 parts of carbon black, 5 parts of resin, 5 parts of short fibers, 1 part of an anti-aging agent, 2 parts of zinc oxide, 2 parts of stearic acid, 1 part of zinc stearate, 1 part of high-molecular wax, 1 part of an accelerator, 2 parts of coumarone, 2 parts of dibutyl phthalate and 1-5 parts of a vulcanizing agent.
3. The oil-resistant and aging-resistant rubber oil cylinder plug according to claim 1, characterized in that: the automobile silica gel plug comprises, by weight, 70 parts of nitrile rubber, 45 parts of carbon black, 10 parts of resin, 10 parts of short fibers, 3 parts of an anti-aging agent, 5 parts of zinc oxide, 5 parts of stearic acid, 3 parts of zinc stearate, 3 parts of high-molecular wax, 3 parts of an accelerator, 5 parts of coumarone, 6 parts of dibutyl phthalate and 3 parts of a vulcanizing agent.
4. The oil-resistant and aging-resistant rubber oil cylinder plug according to claim 1, characterized in that: the automobile silica gel plug comprises, by weight, 680 parts of nitrile-butadiene rubber, 60 parts of carbon black, 15 parts of resin, 10 parts of short fibers, 5 parts of an anti-aging agent, 8 parts of zinc oxide, 8 parts of stearic acid, 5 parts of zinc stearate, 5 parts of high-molecular wax, 5 parts of an accelerator, 8 parts of coumarone, 10 parts of dibutyl phthalate and 5 parts of a vulcanizing agent.
5. The processing method of the oil-resistant and aging-resistant rubber oil cylinder plug as claimed in claim 1, characterized by comprising the following steps:
s1: preparing plug materials by weight parts of 60-80 parts of nitrile butadiene rubber, 30-60 parts of carbon black, 5-15 parts of resin, 5-10 parts of short fibers, 1-5 parts of an anti-aging agent, 2-8 parts of zinc oxide, 2-8 parts of stearic acid, 1-5 parts of zinc stearate, 1-5 parts of high molecular wax, 1-5 parts of an accelerator, 2-8 parts of coumarone, 2-10 parts of dibutyl phthalate and 1-5 parts of a vulcanizing agent;
s2: adding the material of the plug prepared in the S1 into an internal mixer for mixing, wherein the mixing temperature is 11-140 ℃, the mixing pressure is 0.1-0.4 MPa, and the mixing time is 5-15 minutes; after mixing, adding 1-5 parts of vulcanizing agent into an open mill, and finally cooling and standing the lower piece for later use;
s3: setting the vulcanizing temperature of the flat plate, wherein the upper mold is 150-170 ℃, the lower mold is 150-170 ℃, and the mold is placed into a flat vulcanizing machine and heated; after the temperature is raised to the specified temperature, preserving the heat for 30 minutes; cutting the mixed rubber into strips, weighing, putting the strips into a die cavity, starting a machine, and pressing the die; and taking out the product after vulcanization is finished.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011475882.9A CN112898647A (en) | 2020-12-14 | 2020-12-14 | Oil-resistant and aging-resistant rubber oil cylinder plug and processing method thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011475882.9A CN112898647A (en) | 2020-12-14 | 2020-12-14 | Oil-resistant and aging-resistant rubber oil cylinder plug and processing method thereof |
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| Publication Number | Publication Date |
|---|---|
| CN112898647A true CN112898647A (en) | 2021-06-04 |
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| CN202011475882.9A Pending CN112898647A (en) | 2020-12-14 | 2020-12-14 | Oil-resistant and aging-resistant rubber oil cylinder plug and processing method thereof |
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Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH09143449A (en) * | 1995-11-20 | 1997-06-03 | Nippon Valqua Ind Ltd | Sealing material for connector |
| JP2005054904A (en) * | 2003-08-05 | 2005-03-03 | Sanshin Kogyo Kk | Material for gasket, and method for manufacturing the same |
| CN104861229A (en) * | 2015-05-06 | 2015-08-26 | 柳州杰龙汽车零部件制造有限公司 | Sealing element for automobiles |
| WO2018108602A1 (en) * | 2016-12-16 | 2018-06-21 | Contitech Schlauch Gmbh | Rubber mixture |
| CN110885481A (en) * | 2019-11-27 | 2020-03-17 | 上海捷赢密封技术有限公司 | High-temperature wear-resistant sealing ring and preparation method thereof |
-
2020
- 2020-12-14 CN CN202011475882.9A patent/CN112898647A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH09143449A (en) * | 1995-11-20 | 1997-06-03 | Nippon Valqua Ind Ltd | Sealing material for connector |
| JP2005054904A (en) * | 2003-08-05 | 2005-03-03 | Sanshin Kogyo Kk | Material for gasket, and method for manufacturing the same |
| CN104861229A (en) * | 2015-05-06 | 2015-08-26 | 柳州杰龙汽车零部件制造有限公司 | Sealing element for automobiles |
| WO2018108602A1 (en) * | 2016-12-16 | 2018-06-21 | Contitech Schlauch Gmbh | Rubber mixture |
| CN110885481A (en) * | 2019-11-27 | 2020-03-17 | 上海捷赢密封技术有限公司 | High-temperature wear-resistant sealing ring and preparation method thereof |
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Application publication date: 20210604 |
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