CN113334810A - Production device and production method of thermoplastic polyimide film - Google Patents
Production device and production method of thermoplastic polyimide film Download PDFInfo
- Publication number
- CN113334810A CN113334810A CN202110653227.6A CN202110653227A CN113334810A CN 113334810 A CN113334810 A CN 113334810A CN 202110653227 A CN202110653227 A CN 202110653227A CN 113334810 A CN113334810 A CN 113334810A
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- Prior art keywords
- reaction kettle
- welded
- polyimide film
- grinding
- sleeve
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29D—PRODUCING PARTICULAR ARTICLES FROM PLASTICS OR FROM SUBSTANCES IN A PLASTIC STATE
- B29D7/00—Producing flat articles, e.g. films or sheets
- B29D7/01—Films or sheets
-
- 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
- B29B13/00—Conditioning or physical treatment of the material to be shaped
- B29B13/10—Conditioning or physical treatment of the material to be shaped by grinding, e.g. by triturating; by sieving; by filtering
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29K—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES B29B, B29C OR B29D, RELATING TO MOULDING MATERIALS OR TO MATERIALS FOR MOULDS, REINFORCEMENTS, FILLERS OR PREFORMED PARTS, e.g. INSERTS
- B29K2079/00—Use of polymers having nitrogen, with or without oxygen or carbon only, in the main chain, not provided for in groups B29K2061/00 - B29K2077/00, as moulding material
- B29K2079/08—PI, i.e. polyimides or derivatives thereof
- B29K2079/085—Thermoplastic polyimides, e.g. polyesterimides, PEI, i.e. polyetherimides, or polyamideimides; Derivatives thereof
Abstract
The invention discloses a production device and a production method of a thermoplastic polyimide film, and the production device comprises a reaction kettle, a defoaming box and a casting box, wherein the reaction kettle, the defoaming box and the casting box are all fixedly penetrated through and welded with connecting pipes, a liquid inlet pipe is fixedly penetrated through and welded at a position of the reaction kettle far away from the defoaming box, two feed pipes are symmetrically fixedly penetrated through and welded on the top wall of the reaction kettle, feed hoppers are fixedly penetrated through and welded on the top walls of the two feed pipes, a grinding sleeve and a flow guide sleeve are respectively welded and fixed on the inner wall of the reaction kettle, a grinding device is arranged in a motor sleeve, a vibration knocking device is arranged in the reaction kettle, and a proportion adjusting device is arranged in the feed pipes. Has the advantages that: according to the invention, through arranging the grinding plate, the grinding sleeve and other structures, the grinding plate is rotated to grind and crush blocky particles, so that raw materials can be fully mixed with liquid, and the raw materials are stirred more fully and uniformly.
Description
Technical Field
The invention relates to the technical field of high polymer materials, in particular to a production device and a production method of a thermoplastic polyimide film.
Background
The trend of thin, light, short and small electronic products, especially portable electronic products, is becoming one of the most popular of the various types of electronic products, and flexible printed circuit boards (FPCs) are made of copper foil (used as a conductor), film (used as an insulating substrate), and adhesive (used as a bonding material between film and copper foil), and due to the expansion of FPC technology and application fields, there are higher requirements for the mechanical strength and rigidity of the film substrate, and under the market demand, polyimide film material products are developed to serve as the insulating substrate.
However, the polyimide film material often has the defects of uneven stirring and inconvenient adjustment of the proportion of raw materials in the manufacturing process, and the invention designs a production device and a production method of the thermoplastic polyimide film based on the defects.
Disclosure of Invention
The invention aims to solve the problem that the stirring of a polyimide film material is not uniform in the process of stirring raw materials in the prior art, and provides a production device and a production method of a thermoplastic polyimide film.
In order to achieve the purpose, the invention adopts the following technical scheme: the utility model provides a apparatus for producing of thermoplasticity polyimide film, includes reation kettle, takes off bubble case and curtain coating case, reation kettle and take off bubble case, defoaming case and curtain coating case all run through welded fastening jointly and have the connecting pipe, reation kettle keeps away from the position of taking off the bubble case and runs through welded fastening and have the feed liquor pipe, reation kettle's roof symmetry runs through welded fastening and has two inlet pipes, two the roof of inlet pipe all runs through welded fastening and has the feeder hopper, reation kettle's inner wall welded fastening respectively has grinding cover and water conservancy diversion cover, be provided with grinder in the motor cover, the inside device that shakes that is provided with of reation kettle, be provided with the proportion adjusting device in the inlet pipe.
In the above-mentioned apparatus for producing of thermoplasticity polyimide film, grinder is including the motor, motor welded fastening is in the inside of motor cover, the output shaft of motor runs through reation kettle's roof and welded fastening has the axis of rotation, welded fastening has synchronous piece in the axis of rotation, circumference equidistant welded fastening has three connecting rod, and is three on the synchronous piece the equal welded fastening of the other end of connecting rod has the permanent magnet, equal welded fastening has the lapping plate on the permanent magnet, the inner wall friction that the lapping plate evenly ground the cover offsets, the discharge gate has been seted up to one side that the motor cover was kept away from to the grinding cover, it has the filter screen to run through welded fastening in the discharge gate.
In the production device of the thermoplastic polyimide film, the vibration knocking device comprises three telescopic rods, the circumferences of the three telescopic rods are equidistantly welded and fixed on the inner top wall of the reaction kettle, the free ends of the telescopic rods are all welded and fixed with fixed plates, the bottom wall of each fixed plate is all welded and fixed with a knocking ball, the telescopic rods are all sleeved with springs, one ends of the springs are abutted to the fixed plates, and the other ends of the springs are abutted to the inner top wall of the reaction kettle.
In the production device of the thermoplastic polyimide film, the proportion adjusting device comprises two nuts, the two nuts are respectively in one-to-one correspondence with the two feeding pipes and are rotationally connected with the outer side walls of the feeding pipes, threaded rods are connected in the nuts in a threaded manner, the threaded rods penetrate through the side walls of the feeding pipes and extend out of the inner portions of the feeding pipes to be fixedly welded with pushing plates, and elastic blocks are fixedly glued on the top walls of the pushing plates and one side walls of the feeding pipes.
In the production device of the thermoplastic polyimide film, the rotating shaft penetrates through the filter screen and the flow guide sleeve, a stirring sheet is fixedly welded below the flow guide sleeve, and the bottom end of the rotating shaft is rotatably connected with the top wall of the reaction kettle.
In the above apparatus for producing thermoplastic polyimide film, the reaction kettle is of a drum-shaped structure, the guide sleeve is located below the grinding sleeve, the guide sleeve and the grinding sleeve are both of a truncated cone-shaped structure with an upper wall and a lower wall, and the grinding sleeve is provided with a feed port in a closed manner.
In the production device of the thermoplastic polyimide film, the feeding pipe is of a cuboid structure, the pushing plate is in sliding connection with the side wall of the feeding pipe, the beating ball is made of a magnetic material, and the beating ball and the permanent magnet are the same in magnetism.
In the above method for producing a thermoplastic polyimide film, the thermoplastic polyimide film comprises materials such as polyimide, a coupling agent, etc.;
the production method comprises the following steps:
1. at room temperature, materials such as polyimide and a coupling agent are respectively placed into a feed hopper, nuts are rotated according to the proportion of the raw materials, a threaded rod drives a push plate to adjust the size of the cross section of the falling raw materials, the proportion of the raw materials is adjusted, and some liquid reactants enter the reaction kettle through a liquid inlet pipe to be stirred.
2. The time after stirring is about two hours, so that the raw material is made into what is called a dope solution.
3. Enabling the membrane liquid to enter a defoaming box through a connecting pipe, and removing bubbles in the membrane liquid in a vacuum state;
4. and the liquid medicine defoamed in the defoaming box enters the casting box through the connecting pipe, so that the film liquid is processed into a polyimide film with uniform thickness.
Compared with the prior art, the invention has the advantages that:
1. according to the invention, by arranging the feed hopper, the nut, the threaded rod and the like, the threaded rod drives the push plate to move by rotating the nut, so that the elastic block stretches to change the cross sectional area of the feed pipe, the circulation amount of raw materials in unit time is changed, the proportion of the raw materials is changed, and the manufacturing requirements of various thermoplastic polyimide films can be met;
2. by arranging the grinding sleeve, the grinding plate and other structures, the grinding plate is rotated by starting the motor in the descending process of the raw materials, so that the granular raw materials which cannot penetrate through the filter screen are ground and crushed, the raw materials can be changed into powder to be mixed with liquid, and the raw materials are mixed better and uniformly;
3. by arranging the permanent magnet, the spring and other structures, when the grinding plate rotates to a position close to the beating ball, the beating ball is lifted upwards through the magnetic repulsion force between the beating ball and the permanent magnet, and when the grinding plate rotates to a direction far away from the beating ball, the beating ball moves upwards under the action of self gravity to beat the grinding plate, so that raw materials blocked on the feeding hole are beaten, and the blockage of the grinding sleeve is avoided;
4. through setting up water conservancy diversion cover isotructure for the raw materials that drop on sheathe in by grinding drops to the below of water conservancy diversion cover through the effect of water conservancy diversion cover, and stirs raw materials and liquid through the stirring of stirring piece, thereby the water conservancy diversion cover is placed the liquid that the stirring was come out and is splashed to grinding and sheathe in the influence to the grinding process of raw materials.
Drawings
FIG. 1 is a first perspective view of an apparatus for manufacturing a thermoplastic polyimide film and a method for manufacturing the same according to the present invention;
FIG. 2 is a second perspective view of an apparatus for manufacturing a thermoplastic polyimide film and a method for manufacturing the same according to the present invention;
FIG. 3 is a first side sectional view of an apparatus for manufacturing a thermoplastic polyimide film and a method for manufacturing the same according to the present invention;
FIG. 4 is a second cross-sectional side view of an apparatus for manufacturing a thermoplastic polyimide film and a method for manufacturing the same according to the present invention;
FIG. 5 is a schematic diagram showing the components of an apparatus for producing a thermoplastic polyimide film and a method for producing the same according to the present invention;
FIG. 6 is a sectional view of a feed hopper in the apparatus for manufacturing a thermoplastic polyimide film and the method for manufacturing the same according to the present invention;
in the figure: the device comprises a reaction kettle 1, a defoaming box 2, a casting box 3, a connecting pipe 4, a liquid inlet pipe 5, a motor sleeve 6, a feeding pipe 7, a feeding hopper 8, a grinding sleeve 9, a flow guide sleeve 10, a motor 11, a rotating shaft 12, a synchronizing block 13, a connecting rod 14, a permanent magnet 15, a grinding plate 16, a filter screen 17, a telescopic rod 18, a fixing plate 19, a beating ball 20, a spring 21, a nut 22, a threaded rod 23, a pushing plate 24, an elastic block 25 and a stirring sheet 26.
Detailed Description
The following examples are for illustrative purposes only and are not intended to limit the scope of the present invention.
Examples
Referring to fig. 1-6, a apparatus for producing of thermoplasticity polyimide film, including reation kettle 1, deaeration case 2 and curtain coating case 3, reation kettle 1 and deaeration case 2, deaeration case 2 all runs through welded fastening jointly with curtain coating case 3 and has connecting pipe 4, reation kettle 1 keeps away from the position of deaeration case 2 and runs through welded fastening and has feed liquor pipe 5, reation kettle 1's roof symmetry runs through welded fastening and has two inlet pipes 7, the roof of two inlet pipes 7 all runs through welded fastening and has feeder hopper 8, reation kettle 1's inner wall welded fastening respectively has grinding cover 9 and water conservancy diversion cover 10, be provided with grinder in the motor cover 6, reation kettle 1 inside is provided with beats the device that shakes, be provided with proportional control device in the inlet pipe 7.
Grinder is including motor 11, 11 welded fastening of motor is in the inside of motor cover 6, 11 output shaft of motor runs through reation kettle 1's roof and welded fastening has axis of rotation 12, welded fastening has synchronizing block 13 in axis of rotation 12, equidistant welded fastening of circumference has three connecting rod 14 on synchronizing block 13, the equal welded fastening of the other end of three connecting rod 14 has permanent magnet 15, equal welded fastening has lapping plate 16 on permanent magnet 15, the inner wall friction of lapping plate 16 evenly grinds cover 9 offsets, grind cover 9 and keep away from one side of motor cover 6 and seted up the discharge gate, it has filter screen 17 to run through welded fastening in the discharge gate.
The device of shaking is including three telescopic link 18, and equidistant welded fastening in reation kettle 1's interior roof of three telescopic link 18 circumference, and the free end of telescopic link 18 all welded fastening has fixed plate 19, and the diapire of fixed plate 19 all welded fastening has beats ball 20, all overlaps on the telescopic link 18 to be equipped with spring 21, and spring 21's one end offsets with fixed plate 19, and the other end offsets with reation kettle 1's interior roof.
The proportion adjusting device comprises two nuts 22, the two nuts 22 correspond to the two feed pipes 7 one by one and are rotatably connected with the outer side walls of the feed pipes 7, threaded rods 23 are connected in the nuts 22 in a threaded mode, the threaded rods 23 penetrate through the side walls of the feed pipes 7 and extend towards the interior of the feed pipes 7 to be fixedly welded with pushing plates 24, and elastic blocks 25 are fixedly glued together between the top walls of the pushing plates 24 and one side wall of the feed pipe 7.
A method for producing thermoplastic polyimide film, the thermoplastic polyimide film includes materials such as polyimide and coupling agent;
the production method comprises the following steps:
1. at room temperature, materials such as polyimide and coupling agent are respectively placed into the feed hopper 8, the nuts 22 are rotated according to the proportion of the raw materials, the threaded rod 23 drives the push plate to adjust the size of the cross section of the falling raw materials, the proportion of the raw materials is adjusted, and some liquid reactants enter the reaction kettle 1 through the liquid inlet pipe 5 to be stirred.
2. The time after stirring is about two hours, so that the raw material is made into what is called a dope solution.
3. Enabling the membrane liquid to enter a defoaming box 2 through a connecting pipe 4, and removing bubbles in the membrane liquid in a vacuum state;
4. the liquid medicine defoamed in the defoaming box 2 enters the casting box 3 through the connecting pipe 4, so that the film liquid is processed into a polyimide film with uniform thickness.
In the invention, when raw materials react in the reaction kettle 1, the specific operation is as follows, different raw materials are respectively placed on two feeding pipes 7, the nut 22 is rotated according to the proportion of a certain raw material, so that the threaded rod 23 drives the pushing plate 24 to move, the cross-sectional area of the inlet of the raw material is changed through the stretching of the elastic block 25, so that the proportion of the raw material is changed, in the falling process of the raw material, the motor 11 is started, the grinding plate 16 is driven to rotate through the rotation of the rotating shaft 12, the blocky raw material particles are crushed, in the process, the grinding plate 16 rotates to the position close to the beating ball 20, the permanent magnet 15 is close to the beating ball 20, the magnetism repels each other, the beating ball 20 moves upwards, when the grinding plate 16 moves towards the direction far away from the beating ball 20, the magnetic repulsion force is weakened, the beating ball 20 beats the grinding sleeve 9 under the action of self gravity, so that the raw material on the grinding sleeve 9 falls off through beating, and the blockage of the grinding sleeve 9 is avoided.
The raw material dropped from the grinding sleeve 9 enters the lower part of the guide sleeve 10 to be mixed with the raw material liquid through the guide action of the guide sleeve 10, and the raw material is uniformly mixed through the stirring of the stirring sheet 26.
Although terms such as the reaction vessel 1, the degassing tank 2, the casting tank 3, the connection pipe 4, the liquid inlet pipe 5, the motor housing 6, the material inlet pipe 7, the material inlet hopper 8, the grinding housing 9, the flow guide housing 10, the motor 11, the rotation shaft 12, the synchronization block 13, the connection rod 14, the permanent magnet 15, the grinding plate 16, the filter screen 17, the expansion link 18, the fixing plate 19, the beating ball 20, the spring 21, the nut 22, the threaded rod 23, the pushing plate 24, the elastic block 25, and the stirring plate 26 are used more frequently, the possibility of using other terms is not excluded. These terms are used merely to more conveniently describe and explain the nature of the present invention; it is to be understood that the additional limitations of any apparatus for producing a thermoplastic polyimide film and the method for producing the same are contrary to the spirit of the present invention.
Claims (8)
1. A production device of thermoplastic polyimide film comprises a reaction kettle (1), a defoaming box (2) and a casting box (3), it is characterized in that the reaction kettle (1), the defoaming box (2) and the casting box (3) are all fixedly provided with connecting pipes (4) in a penetrating and welding way, a liquid inlet pipe (5) penetrates through the reaction kettle (1) and is fixedly welded at the position far away from the defoaming box (2), two feed pipes (7) are symmetrically fixed on the top wall of the reaction kettle (1) in a penetrating and welding way, feed hoppers (8) are fixed on the top walls of the two feed pipes (7) in a penetrating and welding way, the inner wall of the reaction kettle (1) is respectively welded and fixed with a grinding sleeve (9) and a flow guide sleeve (10), the grinding device is arranged in the motor sleeve (6), the vibration knocking device is arranged in the reaction kettle (1), and the proportion adjusting device is arranged in the feeding pipe (7).
2. The apparatus for producing a thermoplastic polyimide film according to claim 1, the grinding device comprises a motor (11), the motor (11) is welded and fixed in a motor sleeve (6), an output shaft of the motor (11) penetrates through the top wall of the reaction kettle (1) and is fixedly welded with a rotating shaft (12), a synchronous block (13) is fixedly welded on the rotating shaft (12), three connecting rods (14) are fixedly welded on the synchronous block (13) at equal intervals, permanent magnets (15) are fixedly welded at the other ends of the three connecting rods (14), the permanent magnets (15) are welded and fixed with grinding plates (16), the grinding plates (16) uniformly grind the inner walls of the sleeves (9) to be against by friction, a discharge hole is formed in one side, far away from the motor sleeve (6), of the grinding sleeve (9), and a filter screen (17) penetrates through and is welded and fixed in the discharge hole.
3. The production device of the thermoplastic polyimide film as claimed in claim 2, wherein the vibration striking device comprises three telescopic rods (18), the three telescopic rods (18) are circumferentially and equidistantly welded and fixed on the inner top wall of the reaction kettle (1), the free ends of the telescopic rods (18) are respectively welded and fixed with a fixing plate (19), the bottom walls of the fixing plates (19) are respectively welded and fixed with striking balls (20), the telescopic rods (18) are respectively sleeved with a spring (21), one end of each spring (21) abuts against the fixing plate (19), and the other end of each spring abuts against the inner top wall of the reaction kettle (1).
4. The production device of the thermoplastic polyimide film as claimed in claim 1, wherein the ratio adjusting device comprises two nuts (22), the two nuts (22) are respectively in one-to-one correspondence with the two feeding pipes (7) and are rotatably connected with the outer side walls of the feeding pipes (7), threaded rods (23) are respectively and threadedly connected in the nuts (22), the threaded rods (23) penetrate through the side walls of the feeding pipes (7) and are fixedly welded to push plates (24) extending towards the insides of the feeding pipes (7), and the top walls of the push plates (24) and one side wall of each feeding pipe (7) are jointly glued and fixed with elastic blocks (25).
5. The apparatus for producing a thermoplastic polyimide film according to claim 2, wherein the rotating shaft (12) penetrates through the filter screen (17) and the flow guide sleeve (10) and is welded and fixed with a stirring sheet (26) below the flow guide sleeve (10), and the bottom end of the rotating shaft (12) is rotatably connected with the top wall of the reaction vessel (1).
6. The production device of the thermoplastic polyimide film as claimed in claim 1, wherein the reaction kettle (1) is of a barrel-shaped structure, the guide sleeve (10) is located below the grinding sleeve (9), the guide sleeve (10) and the grinding sleeve (9) are of a truncated cone-shaped structure with an upper wall and a lower wall, and the grinding sleeve (9) is provided with a feed port in a sealing manner.
7. The production device of the thermoplastic polyimide film as claimed in claim 3, wherein the feeding pipe (7) is in a rectangular parallelepiped structure, the pushing plate (24) is slidably connected with the side wall of the feeding pipe (7), the beating ball (20) is made of a magnetic material, and the magnetism of the beating ball (20) is the same as that of the permanent magnet (15).
8. The method for producing a thermoplastic polyimide film according to claim 1, wherein the thermoplastic polyimide film comprises materials such as polyimide and a coupling agent;
the production method comprises the following steps:
at room temperature, respectively putting various materials such as polyimide and a coupling agent into a feed hopper (8), rotating a nut (22) according to the proportion of each raw material, so that a threaded rod (23) drives a push plate to adjust the size of the cross section of the falling raw material, adjusting the proportion of the raw material, and allowing some liquid reactants to enter the reaction kettle (1) through a liquid inlet pipe (5) for stirring;
the time after stirring is about two hours, so that the raw material is made into membrane liquid;
enabling the membrane liquid to enter a defoaming box (2) through a connecting pipe (4), and removing bubbles in the membrane liquid in a vacuum state;
the liquid medicine defoamed in the defoaming box (2) enters the casting box (3) through a connecting pipe (4), so that the film liquid is processed into a polyimide film with uniform thickness.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110653227.6A CN113334810A (en) | 2021-06-11 | 2021-06-11 | Production device and production method of thermoplastic polyimide film |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110653227.6A CN113334810A (en) | 2021-06-11 | 2021-06-11 | Production device and production method of thermoplastic polyimide film |
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| Publication Number | Publication Date |
|---|---|
| CN113334810A true CN113334810A (en) | 2021-09-03 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202110653227.6A Withdrawn CN113334810A (en) | 2021-06-11 | 2021-06-11 | Production device and production method of thermoplastic polyimide film |
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| Country | Link |
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| CN (1) | CN113334810A (en) |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4205491A (en) * | 1978-09-29 | 1980-06-03 | Ietatsu Ohno | Vibration barrel grinding device |
| CN103087338A (en) * | 2013-01-18 | 2013-05-08 | 淮安科润膜材料有限公司 | Device and method for manufacturing composite perfluorinated ion exchange membrane for vanadium battery |
| CN210303381U (en) * | 2019-07-26 | 2020-04-14 | 吴永喜 | High-efficient agitating unit is used in essence production |
| CN211251049U (en) * | 2019-07-02 | 2020-08-14 | 宜兴俞佳电子科技有限公司 | Novel polyimide film production device |
| CN112266719A (en) * | 2020-11-11 | 2021-01-26 | 安徽理工大学 | Anti-aging polyurethane coating and production device thereof |
| CN112723650A (en) * | 2020-11-24 | 2021-04-30 | 江苏龙岱环保科技有限公司 | MBR hollow fiber membrane effluent treatment plant |
-
2021
- 2021-06-11 CN CN202110653227.6A patent/CN113334810A/en not_active Withdrawn
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4205491A (en) * | 1978-09-29 | 1980-06-03 | Ietatsu Ohno | Vibration barrel grinding device |
| CN103087338A (en) * | 2013-01-18 | 2013-05-08 | 淮安科润膜材料有限公司 | Device and method for manufacturing composite perfluorinated ion exchange membrane for vanadium battery |
| CN211251049U (en) * | 2019-07-02 | 2020-08-14 | 宜兴俞佳电子科技有限公司 | Novel polyimide film production device |
| CN210303381U (en) * | 2019-07-26 | 2020-04-14 | 吴永喜 | High-efficient agitating unit is used in essence production |
| CN112266719A (en) * | 2020-11-11 | 2021-01-26 | 安徽理工大学 | Anti-aging polyurethane coating and production device thereof |
| CN112723650A (en) * | 2020-11-24 | 2021-04-30 | 江苏龙岱环保科技有限公司 | MBR hollow fiber membrane effluent treatment plant |
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Application publication date: 20210903 |