CN113442316A - Preparation method and equipment of polysulfide rubber - Google Patents
Preparation method and equipment of polysulfide rubber Download PDFInfo
- Publication number
- CN113442316A CN113442316A CN202110762777.1A CN202110762777A CN113442316A CN 113442316 A CN113442316 A CN 113442316A CN 202110762777 A CN202110762777 A CN 202110762777A CN 113442316 A CN113442316 A CN 113442316A
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- stirring
- rotating shaft
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- top end
- pivot
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- 229920001971 elastomer Polymers 0.000 title claims abstract description 22
- 229920001021 polysulfide Polymers 0.000 title claims abstract description 22
- 239000005077 polysulfide Substances 0.000 title claims abstract description 22
- 150000008117 polysulfides Polymers 0.000 title claims abstract description 22
- 239000005060 rubber Substances 0.000 title claims abstract description 22
- 238000002360 preparation method Methods 0.000 title claims abstract description 17
- 238000003756 stirring Methods 0.000 claims abstract description 86
- 239000002994 raw material Substances 0.000 claims abstract description 24
- 238000007599 discharging Methods 0.000 claims description 16
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 12
- 239000000428 dust Substances 0.000 claims description 10
- 238000002156 mixing Methods 0.000 claims description 6
- 238000000034 method Methods 0.000 claims description 2
- 239000000203 mixture Substances 0.000 description 3
- 239000003795 chemical substances by application Substances 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 239000003822 epoxy resin Substances 0.000 description 2
- 229920000647 polyepoxide Polymers 0.000 description 2
- 229920000459 Nitrile rubber Polymers 0.000 description 1
- 230000032683 aging Effects 0.000 description 1
- 229910052783 alkali metal Inorganic materials 0.000 description 1
- 150000001340 alkali metals Chemical class 0.000 description 1
- 229910052784 alkaline earth metal Inorganic materials 0.000 description 1
- 150000001342 alkaline earth metals Chemical class 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 239000005340 laminated glass Substances 0.000 description 1
- 239000004816 latex Substances 0.000 description 1
- 229920000126 latex Polymers 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000006068 polycondensation reaction Methods 0.000 description 1
- 239000003566 sealing material Substances 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
- 239000002904 solvent Substances 0.000 description 1
- 229920003051 synthetic elastomer Polymers 0.000 description 1
- 239000005061 synthetic rubber Substances 0.000 description 1
Images
Classifications
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- 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
- B29B7/02—Mixing; Kneading non-continuous, with mechanical mixing or kneading devices, i.e. batch type
- B29B7/06—Mixing; Kneading non-continuous, with mechanical mixing or kneading devices, i.e. batch type with movable mixing or kneading devices
- B29B7/10—Mixing; Kneading non-continuous, with mechanical mixing or kneading devices, i.e. batch type with movable mixing or kneading devices rotary
- B29B7/12—Mixing; Kneading non-continuous, with mechanical mixing or kneading devices, i.e. batch type with movable mixing or kneading devices rotary with single shaft
- B29B7/16—Mixing; Kneading non-continuous, with mechanical mixing or kneading devices, i.e. batch type with movable mixing or kneading devices rotary with single shaft with paddles or arms
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B08—CLEANING
- B08B—CLEANING IN GENERAL; PREVENTION OF FOULING IN GENERAL
- B08B17/00—Methods preventing fouling
- B08B17/02—Preventing deposition of fouling or of dust
- B08B17/04—Preventing deposition of fouling or of dust by using removable coverings
-
- 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
- B29B7/02—Mixing; Kneading non-continuous, with mechanical mixing or kneading devices, i.e. batch type
- B29B7/22—Component parts, details or accessories; Auxiliary operations
-
- 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
- B29B7/02—Mixing; Kneading non-continuous, with mechanical mixing or kneading devices, i.e. batch type
- B29B7/22—Component parts, details or accessories; Auxiliary operations
- B29B7/24—Component parts, details or accessories; Auxiliary operations for feeding
-
- 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
- B29B7/02—Mixing; Kneading non-continuous, with mechanical mixing or kneading devices, i.e. batch type
- B29B7/22—Component parts, details or accessories; Auxiliary operations
- B29B7/26—Component parts, details or accessories; Auxiliary operations for discharging, e.g. doors
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Mixers Of The Rotary Stirring Type (AREA)
Abstract
The invention discloses a polysulfide rubber preparation method and equipment, which comprises a stirring barrel and a differential mechanism, wherein a stirring cavity is formed in the stirring barrel, the differential mechanism consists of a first rotating shaft, a second rotating shaft and a linkage mechanism, the first rotating shaft is rotatably connected to the top end of the inner wall of the stirring cavity, a rotating hole is formed in the top end of the first rotating shaft, the inner wall of the rotating hole is rotatably connected with a connecting shaft through a bearing, the bottom end of the connecting shaft is fixedly connected with the top end of the second rotating shaft, the linkage mechanism is arranged at the top end of the stirring barrel, and a group of stirring rods is arranged on the outer walls of the first rotating shaft and the second rotating shaft. According to the invention, the first rotating shaft and the second rotating shaft rotate at different speeds by utilizing the matching of the first rotating shaft, the second rotating shaft, the connecting shaft and the linkage mechanism and the action of the linkage mechanism and the connecting shaft, so that the two groups of stirring rods rotate at different speeds, and differential stirring is formed in the stirring cavity, so that various raw materials in the stirring cavity can be quickly and uniformly mixed.
Description
Technical Field
The invention relates to the field of rubber preparation, in particular to a preparation method and equipment of polysulfide rubber.
Background
Polysulfide rubber is a synthetic rubber obtained by polycondensation of dihaloalkane and polysulfide of alkali metal or alkaline earth metal, has excellent oil resistance and solvent resistance, but has low strength, poor aging resistance, poor processability and odor, is often used in combination with nitrile rubber, and industrial products include solid polysulfide rubber, liquid polysulfide rubber and polysulfide latex. The epoxy resin curing agent is mainly used as a sealing material for buildings, laminated glass and other industries and a curing agent for epoxy resin.
Polysulfide rubber preparation technology step is many, and the stirring is one of its numerous steps, makes multiple preparation raw materials mix through the stirring, but present stirring mode all drives single pivot through the motor, rotates through the pivot and drives multiunit puddler and rotate simultaneously and stir for the stirring speed of multiunit puddler is the same, can't carry out the homogeneous mixing fast to multiple raw materials.
Disclosure of Invention
The invention aims to provide a preparation method and equipment of polysulfide rubber, which aim to solve the problems in the background technology.
In order to achieve the purpose, the invention provides the following technical scheme: a preparation method and equipment of polysulfide rubber comprise:
the stirring barrel is internally provided with a stirring cavity;
the differential mechanism comprises a first rotating shaft, a second rotating shaft and a linkage mechanism, the first rotating shaft is rotatably connected to the top end of the inner wall of the stirring cavity, a rotating hole is formed in the top end of the first rotating shaft, the inner wall of the rotating hole is rotatably connected with a connecting shaft through a bearing, the bottom end of the connecting shaft is fixedly connected with the top end of the second rotating shaft, the linkage mechanism is arranged at the top end of the stirring barrel, and a group of stirring rods is arranged on the outer walls of the first rotating shaft and the second rotating shaft.
Through adopting above-mentioned scheme, under link gear's cooperation, make the rotational speed of first pivot and connecting axle different, first pivot rotates a set of puddler that drives the top and rotates, the connecting axle rotates and drives the second pivot and rotates, the second pivot rotates and drives a set of puddler of below and rotates, make the rotational speed of two sets of puddlers different, thereby the upper and lower part in the stirring intracavity stirs with different speeds, and then forms the differential stirring, make the raw materials that is located the stirring intracavity mix from top to bottom fast, accelerate the multiple raw materials of stirring intracavity and mix fast.
Preferably, the link gear includes first sprocket and second sprocket, the fixed cover of first sprocket connects in the outer wall of first pivot, the fixed outer wall that cup joints in the connecting axle of second sprocket, the top of agitator is rotated and is connected with the drive shaft, the outer wall of drive shaft is fixed to be cup jointed two third sprockets, one of them be provided with first chain between third sprocket and the first sprocket, wherein another be provided with the second chain between third sprocket and the second sprocket.
Through adopting above-mentioned scheme, make two third sprockets can rotate with same rotational speed round the drive shaft, but the diameter size of first sprocket and second sprocket is different, thereby under first chain and second chain are connected, make first sprocket and second sprocket and two third sprockets have same linear velocity, but the angular velocity of the first sprocket that the diameter is different and second sprocket is different, make the rotational speed of first sprocket and second sprocket self just different, and then use first pivot and connecting axle just to have different rotational speeds, can use a actuating mechanism to drive two sets of puddlers and rotate with different speeds, and the cost is saved.
Preferably, the top end of the stirring barrel is fixedly connected with an outer frame, and the driving shaft penetrates through the inner wall of the outer frame and extends to the outside of the outer frame.
Through adopting above-mentioned scheme, can be provided with electric drive mechanism in the top of frame, electric drive mechanism's output is connected with the top of drive shaft, can drive the drive shaft through electric drive mechanism and rotate, can make two third sprocket rotate, and then drive two sets of puddlers and rotate with the rotational speed of difference.
Preferably, the top fixed interlude of agitator is connected with the inlet pipe, the top cover of inlet pipe is equipped with the shield.
Through adopting above-mentioned scheme for the inlet pipe can be used and pour into different raw materials into to the stirring intracavity, and the shield makes the inlet pipe can cover on the top of inlet pipe when not the material loading, thereby plugs up the feed inlet of inlet pipe, sneaks into the dust in avoiding the dust to get into the stirring chamber through the inlet pipe and makes when stirring in the raw materials, avoids the rubber quality of production to reduce.
Preferably, the bottom fixedly connected with water conservancy diversion piece of stirring intracavity wall, the bottom fixedly interlude of agitator is connected with the discharging pipe, the mid-mounting of discharging pipe has the valve.
Through adopting above-mentioned scheme, the inclined plane has been seted up on the top of water conservancy diversion piece, and the discharge hole has been seted up at the middle part on its top for the raw materials that are located water conservancy diversion piece top can all flow along the inclined plane and flow downthehole, and rethread discharge hole gets into the discharging pipe, thereby makes the raw materials after the mixing discharge the stirring chamber through the discharging pipe, and the valve is convenient for control the circulation of discharging pipe, and during the feasible stirring, the raw materials can not flow from the discharging pipe.
Preferably, the preparation method of the polysulfide rubber comprises the following steps:
the method comprises the following steps: preparing polysulfide rubber, namely firstly, by utilizing the arrangement of a first rotating shaft, a second rotating shaft, a connecting shaft and a linkage mechanism, enabling the first rotating shaft and the second rotating shaft to rotate at different speeds under the action of the linkage mechanism and the connecting shaft, and enabling two groups of stirring rods to rotate at different speeds, so that differential stirring is formed in a stirring cavity;
step two: through the arrangement of the dustproof cover, the dustproof cover covers the top end of the feeding pipe, so that external dust is prevented from entering the stirring cavity through the feeding pipe;
step three: utilize the setting of water conservancy diversion piece, the top of water conservancy diversion piece is seted up there is the inclined plane, and the flow hole has been seted up at the middle part on its top for the raw materials that is located water conservancy diversion piece top can all flow along the inclined plane and flow downtheholely, and rethread flow hole gets into the discharging pipe, thereby makes the raw materials discharge stirring chamber after the mixing through the discharging pipe.
The invention has the technical effects and advantages that:
(1) according to the invention, by means of the arrangement of the first rotating shaft, the second rotating shaft, the connecting shaft and the linkage mechanism, the first rotating shaft and the second rotating shaft rotate at different speeds under the action of the linkage mechanism and the connecting shaft, so that two groups of stirring rods rotate at different speeds, differential stirring is formed in the stirring cavity, and various raw materials in the stirring cavity can be quickly and uniformly mixed;
(2) according to the invention, the dust cover is arranged and covers the top end of the feeding pipe, so that external dust is prevented from entering the stirring cavity through the feeding pipe, and the raw materials are prevented from being mixed with the dust during stirring;
(3) according to the invention, the arrangement of the flow guide block is utilized, the top end of the flow guide block is provided with the inclined surface, the middle part of the top end of the flow guide block is provided with the flow hole, so that raw materials positioned at the top end of the flow guide block can flow into the flow hole along the inclined surface and then enter the discharge pipe through the flow hole, and thus the uniformly mixed raw materials are discharged out of the stirring cavity through the discharge pipe, and the discharging smoothness of the stirring barrel is improved.
Drawings
Fig. 1 is a schematic view of the overall structure of the present invention.
FIG. 2 is a front sectional structural view of the present invention.
Fig. 3 is a schematic view of the enlarged structure at a of fig. 2 according to the present invention.
In the figure: 1. a stirring barrel; 2. a stirring chamber; 3. a first rotating shaft; 4. rotating the hole; 5. a connecting shaft; 6. a stirring rod; 7. a first sprocket; 8. a second sprocket; 9. a drive shaft; 10. a third sprocket; 11. a first chain; 12. a second chain; 13. an outer frame; 14. a second rotating shaft; 15. a feed pipe; 16. a dust cover; 17. a flow guide block; 18. and (4) discharging the pipe.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the 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.
The invention provides a polysulfide rubber preparation method and equipment as shown in figures 1-3, which comprises a stirring barrel 1 and a differential mechanism, wherein a stirring cavity 2 is arranged inside the stirring barrel 1, the differential mechanism consists of a first rotating shaft 3, a second rotating shaft 14 and a linkage mechanism, the first rotating shaft 3 is rotatably connected to the top end of the inner wall of the stirring cavity 2, the top end of the first rotating shaft 3 is provided with a rotating hole 4, the inner wall of the rotating hole 4 is rotatably connected with a connecting shaft 5 through a bearing, the rotation of the connecting shaft 5 and the first rotating shaft 3 is not influenced through the connection of the bearing, the bottom end of the connecting shaft 5 is fixedly connected with the top end of the second rotating shaft 14, so that the second rotating shaft 14 can synchronously rotate along with the connecting shaft 5, the linkage mechanism is arranged at the top end of the stirring barrel 1, and under the action of the linkage mechanism, the first rotating shaft 3 and the second rotating shaft 14 rotate at different speeds, so as to form differential stirring in the stirring cavity 2, and a group of stirring rods 6 are arranged on the outer walls of the first rotating shaft 3 and the second rotating shaft 14;
the linkage mechanism comprises a first chain wheel 7 and a second chain wheel 8, the first chain wheel 7 is fixedly sleeved on the outer wall of the first rotating shaft 3, the second chain wheel 8 is fixedly sleeved on the outer wall of the connecting shaft 5, the top end of the stirring barrel 1 is rotatably connected with a driving shaft 9, the outer wall of the driving shaft 9 is fixedly sleeved with two third chain wheels 10, a first chain 11 is arranged between one third chain wheel 10 and the first chain wheel 7, a second chain 12 is arranged between the other third chain wheel 10 and the second chain wheel 8, the diameter sizes of the first chain wheel 7 and the second chain wheel 8 are different, so that under the driving of the third chain wheel 10 with the same size, the rotating speeds of the first chain wheel 7 and the second chain wheel 8 are different, further, the rotating speeds of the first rotating shaft 3 and the second rotating shaft 14 are different, so that the two groups of stirring rods 6 are stirred at different speeds, differential stirring is formed in the stirring cavity 2, and the raw material of the layer with the slower stirring speed can flow like the layer with the faster speed, so that the raw materials in the stirring cavity 2 can be quickly stirred and mixed;
the top end of the stirring barrel 1 is fixedly connected with an outer frame 13, the outer frame 13 protects an internal linkage mechanism, the driving shaft 9 penetrates through the inner wall of the outer frame 13 and extends to the outside of the outer frame 13, and an external driving mechanism is arranged at the top end of the outer frame 13 and can drive the driving shaft 9 to rotate through the external driving mechanism;
a feed pipe 15 is fixedly inserted and connected to the top end of the stirring barrel 1, raw materials can be injected into the stirring cavity 2 through the feed pipe 15, a dustproof cover 16 is sleeved on the top end of the feed pipe 15, and the dustproof cover 16 covers an opening at the top end of the feed pipe 15, so that dust is prevented from entering the stirring cavity 2 during stirring;
the bottom fixedly connected with water conservancy diversion piece 17 of stirring 2 inner walls in chamber, the bottom fixed interlude of agitator 1 is connected with discharging pipe 18, a plurality of inclined planes have been seted up on the top of water conservancy diversion piece 17, make 2 inside after-mixing raw materials accessible water conservancy diversion pieces 17 in the stirring chamber get into discharging pipe 18, and discharge stirring chamber 2 completely, the mid-mounting of discharging pipe 18 has the valve, control discharging pipe 18's circulation through the valve, the valve can be the solenoid valve, be convenient for control it through external switch, avoid still manual going to twist the valve at every turn, the convenience that the valve used has been improved.
The working principle of the invention is as follows: take off shield 16, pour into multiple raw materials into stirring chamber 2 inside through inlet pipe 15, after finishing pouring into, cover shield 16, drive shaft 9 through outside actuating mechanism area and rotate, drive shaft 9 rotates and drives two third sprocket 10 rotations, under the connection of first chain 11 and second chain 12, make first sprocket 7 and second sprocket 8 rotate, first sprocket 7 rotates and drives first pivot 3 and rotate, make a set of puddler 6 of 3 outer walls of first pivot rotate, second sprocket 8 rotates and drives connecting axle 5 and rotate, make second pivot 14 rotate, and drive another set of puddler 6 of 14 outer walls of second pivot and rotate, make two sets of puddler 6 stir the raw materials in the stirring chamber 2 with different rotational speeds.
Finally, it should be noted that: although the present invention has been described in detail with reference to the foregoing embodiments, it will be apparent to those skilled in the art that modifications may be made to the embodiments or portions thereof without departing from the spirit and scope of the invention.
Claims (6)
1. A polysulfide rubber preparation facility characterized by comprising:
the stirring device comprises a stirring barrel (1), wherein a stirring cavity (2) is formed in the stirring barrel (1);
differential mechanism, differential mechanism comprises first pivot (3), second pivot (14) and link gear, first pivot (3) are rotated and are connected in the top of stirring chamber (2) inner wall, rotation hole (4) have been seted up on the top of first pivot (3), the inner wall that rotates hole (4) is rotated through the bearing and is connected with connecting axle (5), the bottom of connecting axle (5) and the top fixed connection of second pivot (14), link gear sets up in the top of agitator (1), the outer wall of first pivot (3) and second pivot (14) all is provided with a set of puddler (6).
2. The polysulfide rubber preparation facility of claim 1, wherein the linkage mechanism comprises a first chain wheel (7) and a second chain wheel (8), the first chain wheel (7) is fixedly sleeved on the outer wall of the first rotating shaft (3), the second chain wheel (8) is fixedly sleeved on the outer wall of the connecting shaft (5), the top end of the stirring barrel (1) is rotatably connected with a driving shaft (9), the outer wall of the driving shaft (9) is fixedly sleeved with two third chain wheels (10), a first chain (11) is arranged between one of the third chain wheels (10) and the first chain wheel (7), and a second chain (12) is arranged between the other third chain wheel (10) and the second chain wheel (8).
3. The polysulfide rubber preparation facility of claim 2, wherein an outer frame (13) is fixedly connected to the top end of the agitator tank (1), and the driving shaft (9) penetrates through the inner wall of the outer frame (13) and extends to the outside of the outer frame (13).
4. The polysulfide rubber preparation facility of claim 1, wherein a feed pipe (15) is fixedly inserted into the top end of the mixing tank (1), and a dust cap (16) is sleeved on the top end of the feed pipe (15).
5. The polysulfide rubber preparation facility of claim 1, wherein the bottom end of the inner wall of the stirring chamber (2) is fixedly connected with a flow guide block (17), the bottom end of the stirring barrel (1) is fixedly inserted and connected with a discharge pipe (18), and a valve is installed in the middle of the discharge pipe (18).
6. A preparation method of polysulfide rubber comprises the following steps:
the method comprises the following steps: preparing polysulfide rubber, namely firstly, by utilizing the arrangement of a first rotating shaft (3), a second rotating shaft (14), a connecting shaft (5) and a linkage mechanism, enabling the first rotating shaft (3) and the second rotating shaft (4) to rotate at different speeds under the action of the linkage mechanism and the connecting shaft (5), and enabling two groups of stirring rods to rotate at different speeds, so that differential stirring is formed in a stirring cavity;
step two: through the arrangement of the dustproof cover (16), the dustproof cover (16) covers the top end of the feeding pipe (15), so that external dust is prevented from entering the stirring cavity through the feeding pipe (15);
step three: utilize the setting of water conservancy diversion piece (17), the top of water conservancy diversion piece (17) is seted up there is the inclined plane, and the flow hole has been seted up at the middle part on its top for the raw materials that is located water conservancy diversion piece top all can flow into downthehole along the inclined plane, and rethread flow hole gets into the discharging pipe, thereby makes the raw materials discharge stirring chamber after the mixing through discharging pipe (18).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110762777.1A CN113442316A (en) | 2021-07-05 | 2021-07-05 | Preparation method and equipment of polysulfide rubber |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110762777.1A CN113442316A (en) | 2021-07-05 | 2021-07-05 | Preparation method and equipment of polysulfide rubber |
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| Publication Number | Publication Date |
|---|---|
| CN113442316A true CN113442316A (en) | 2021-09-28 |
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| CN202110762777.1A Pending CN113442316A (en) | 2021-07-05 | 2021-07-05 | Preparation method and equipment of polysulfide rubber |
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| CN (1) | CN113442316A (en) |
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