Fireproof heat-insulating mica gasket and preparation method thereof

Abstract

This invention discloses a fireproof and heat-insulating mica gasket and its preparation method, relating to the field of mica gasket preparation technology. It includes a gasket body with an upper metal mesh pressed and fixed to its top and a lower metal mesh pressed and fixed to its bottom. The gasket body is formed by pressing together mica powder, high-temperature resistant resin adhesive, fire-resistant fiber, and flame retardant, with a mass ratio of 5.5:2.5:1.2:0.8. This fireproof and heat-insulating mica gasket and its preparation method introduce fire-resistant fiber and flame retardant into the raw materials for mica gasket preparation, combining mica powder with other fireproof and heat-insulating materials to achieve a superior fireproof and heat-insulating effect. Furthermore, the composite structure design of the mica gasket enhances structural stability while increasing the thickness and number of layers, thereby further improving its overall fireproof and heat-insulating capabilities.

Description

Technical Field

[0001] This invention relates to the field of mica gasket preparation technology, specifically to a fireproof and heat-insulating mica gasket and its preparation method. Background Technology

[0002] Mica gaskets are rectangular or irregularly shaped mica parts made from thick mica sheets through cutting, thickness setting, slicing, or punching. They typically possess good mechanical strength, electrical properties, and high-temperature resistance. Under normal conditions, mica gaskets can stably maintain their performance, thus finding wide application in various situations requiring insulation and high-temperature resistance. In recent years, with the continuous improvement of mica insulation material production technology, the performance of mica gaskets has been significantly improved, and their application areas have continued to expand.

[0003] In the new energy vehicle industry, mica materials are primarily used as thermal runaway protection materials for power batteries. Mica gaskets, due to their excellent high-temperature resistance, high-pressure resistance, insulation, and flexibility, are widely used for thermal runaway protection between modules and between modules and battery covers. With the trend towards module-less designs, mica materials may also be used for thermal runaway protection between battery cells and battery covers. According to relevant institutions, the proportion of mica materials in flame-retardant and heat-insulating materials for power batteries will increase year by year.

[0004] However, despite the many advantages of mica gaskets, with the rapid development of the new energy vehicle industry and the gradual increase in battery energy density, the requirements for thermal runaway protection are also becoming increasingly stringent. As one of the important thermal runaway protection materials, mica gaskets are gradually becoming unable to meet the growing demand for thermal runaway protection. In addition, due to the special properties of mica materials, the processing of mica gaskets is relatively difficult and requires the use of specialized equipment and processes, especially in the mixing and pressing stage. If the pressing force is too small, the gasket will not be easy to form and will easily become loose. If the pressing force is too large, it will cause the finished product to break, resulting in a low yield of mica gaskets.

[0005] Therefore, there is an urgent need to improve this shortcoming. The present invention studies and improves the existing structure and its deficiencies, and provides a fireproof and heat-insulating mica gasket and its preparation method. Summary of the Invention

[0006] The purpose of this invention is to provide a fireproof and heat-insulating mica gasket and its preparation method, so as to solve the problems mentioned in the background art.

[0007] To achieve the above objectives, the present invention provides the following technical solution:

[0008] In a first aspect, a fireproof and heat-insulating mica gasket is provided, comprising a gasket body, wherein an upper metal mesh is pressed and fixed to the top of the gasket body, and a lower metal mesh is pressed and fixed to the bottom of the gasket body. The gasket body is formed by mixing and pressing mica powder, high-temperature resistant resin adhesive, fire-resistant fiber, and flame retardant, and the mass ratio of mica powder, high-temperature resistant resin adhesive, fire-resistant fiber, and flame retardant is 5.5:2.5:1.2:0.8.

[0009] Secondly, a method for preparing a fire-resistant and heat-insulating mica gasket is provided, applicable to the fire-resistant and heat-insulating mica gasket as described above, comprising the following steps:

[0010] S1. Raw material preparation: Select high-quality mica ore as raw material, and obtain mica powder that meets the requirements after crushing and screening.

[0011] S2. Raw material mixing: Add mica powder, high-temperature resistant resin, refractory fiber and flame retardant into the mixing hopper and mix evenly for later use;

[0012] S3, Rotary feeding: The lower metal mesh is conveyed into the pressing trough by the first conveyor belt, and then the processing seat rotates 90 degrees counterclockwise. The material in the mixing bin is conveyed into the pressing trough by the transverse auger. Then the processing seat rotates 90 degrees counterclockwise again. The upper metal mesh is conveyed into the pressing trough by the second conveyor belt. Then the processing seat rotates 90 degrees counterclockwise to rotate the pressing trough to the position directly below the pressing assembly.

[0013] S4. Pressing and molding: The lower metal mesh, mixed material and upper metal mesh in the pressing tank are pressed by the pressing component to obtain the mica gasket semi-finished product. After the mica gasket semi-finished product is pushed out of the pressing tank, the pushing component pushes the mica gasket semi-finished product onto the third conveyor belt and conveys it to the next processing stage.

[0014] S5. Curing treatment: The pressed gasket semi-finished product is cured to improve its fire resistance, heat insulation performance and mechanical strength.

[0015] Furthermore, the processing base includes a fixed base, an annular groove, a servo motor, and a movable plate. The fixed base has an annular groove on its top, and a servo motor is fixedly installed at the center of the top of the fixed base. The output shaft of the servo motor is fixedly connected to the movable plate through a coupling.

[0016] Furthermore, the processing base includes a support slide rod, the top end of which is fixedly connected to the bottom of the movable disk, and the support slide rods are arranged in a circular array at equal intervals. The bottom dimension of the support slide rods is completely matched with the internal dimension of the annular groove, and the movable disk forms a sliding structure with the fixed base through the support slide rods and the annular groove.

[0017] Furthermore, the processing base also includes a first lifting cylinder, a slot support, a cross, and a top seat. The first lifting cylinder is fixedly installed on the top of the movable plate, and the top of the lifting cylinder is fixedly connected to the slot support. The top of the movable plate is fixedly connected to the cross, and the top of the cross is fixedly connected to the top seat. The top seat is fixed directly above the movable plate by the cross.

[0018] Furthermore, the number of pressing slots and the number of first lifting cylinders are both four, and the four pressing slots are arranged in a one-to-one correspondence with the four first lifting cylinders. The shape and size of the pressing slots are matched with the shape and size of the slot support, and the slot support is located inside the pressing slot.

[0019] Furthermore, the pushing assembly includes a fixed base, an electric push rod, and a guide cover. The fixed base is fixed at the top center of the top seat, and the electric push rod is fixedly connected to the outer wall of the fixed base. One end of the electric push rod is fixedly connected to the guide cover.

[0020] Furthermore, the number of electric actuators is four, and the included angle between two adjacent electric actuators is ninety degrees.

[0021] Furthermore, the pressing assembly includes a second lifting cylinder, a fixed plate, and a pressure sensor. The bottom end of the second lifting cylinder is fixedly connected to the fixed plate, and the pressure sensor is installed at the bottom of the fixed plate.

[0022] Furthermore, the pressing assembly also includes a spring, a pressing plate, and a guide rod. The top end of the spring is fixedly connected to the bottom of the fixed plate, and the bottom end of the spring is fixedly connected to the pressing plate. The top of the pressing plate is vertically fixed with a guide rod, which passes through the center of the inner side of the spring and forms a through structure with the fixed plate.

[0023] This invention provides a fireproof and heat-insulating mica gasket and its preparation method, which has the following beneficial effects:

[0024] 1. This invention introduces refractory fibers and flame retardants into the raw materials for preparing mica gaskets, and combines mica powder with other fireproof and heat-insulating materials to form a better fireproof and heat-insulating effect. Furthermore, the mica gasket is designed with a composite structure, with metal mesh pressed and embedded at both the top and bottom of the gasket. This enhances the structural stability and increases the thickness and number of layers of the mica gasket, thereby further improving its overall fireproof and heat-insulating capabilities.

[0025] 2. This invention uses a servo motor to drive the movable disc to rotate, which in turn drives the top seat to rotate, allowing the pressing groove to rotate and switch between four operating positions. This enables three feeding operations and one pressing operation to be performed simultaneously. In conjunction with the first conveyor belt, the second conveyor belt, and the transverse auger, automatic feeding operation is achieved. In conjunction with the pushing component and the third conveyor belt, automatic unloading operation is achieved, truly realizing uninterrupted preparation of mica gaskets and greatly improving the preparation efficiency of mica gaskets.

[0026] 3. In the gasket pressing and molding process, the present invention uses a pressure sensor to detect changes in pressing force in real time, and uses a spring to buffer the pressing force by contracting under force. When the pressure sensor detects that the downward pressure has reached the set value, it immediately controls the second lifting cylinder to stop the pressing operation. This can strictly control the pressing force and avoid the failure of mica gasket pressing due to excessive or insufficient pressing force, which helps to improve the yield of mica gaskets. Attached Figure Description

[0027] Figure 1 This is a three-dimensional structural diagram of an insulating pad according to the present invention;

[0028] Figure 2 This is a schematic flowchart of a method for preparing an insulating gasket according to the present invention;

[0029] Figure 3 This is a schematic diagram of the equipment used in the preparation method of an insulating gasket according to the present invention;

[0030] Figure 4 This invention relates to a method for preparing an insulating gasket. Figure 3 Enlarged schematic diagram of the structure at point A in the middle;

[0031] Figure 5 This is a top view schematic diagram of the processing seat structure for a method of preparing an insulating gasket according to the present invention;

[0032] Figure 6 This is a schematic diagram showing the disassembled structure of the processing seat in the method for preparing an insulating gasket according to the present invention;

[0033] Figure 7 This is a schematic cross-sectional view of the top seat structure of a method for preparing an insulating gasket according to the present invention.

[0034] In the diagram: 1. Processing base; 11. Fixed base; 12. Annular groove; 13. Servo motor; 14. Movable plate; 15. Support slide rod; 16. First lifting cylinder; 17. Groove support; 18. Cross; 19. Top seat; 2. Pressing groove; 3. Pushing assembly; 31. Fixed base; 32. Electric push rod; 33. Guide cover; 4. Horizontal auger; 5. Mixing bin; 6. First conveyor belt; 7. Second conveyor belt; 8. Third conveyor belt; 9. Pressing assembly; 91. Second lifting cylinder; 92. Fixed plate; 93. Pressure sensor; 94. Spring; 95. Pressing plate; 96. Guide rod. Detailed Implementation

[0035] The embodiments of the present invention will be described in further detail below with reference to the accompanying drawings and examples. The following examples are for illustrative purposes only and should not be construed as limiting the scope of the invention.

[0036] Example 1

[0037] like Figure 1 As shown, a fireproof and heat-insulating mica gasket includes a gasket body, an upper metal mesh pressed and fixed on the top of the gasket body, and a lower metal mesh pressed and fixed on the bottom of the gasket body. The gasket body is made by mixing and pressing mica powder, high-temperature resistant resin adhesive, fire-resistant fiber and flame retardant, and the mass ratio of mica powder, high-temperature resistant resin adhesive, fire-resistant fiber and flame retardant is 5.5:2.5:1.2:0.8.

[0038] Example 2

[0039] like Figures 2-7 As shown, a method for preparing a fireproof and heat-insulating mica gasket, applied to the fireproof and heat-insulating mica gasket as described above, includes the following steps:

[0040] S1. Raw material preparation: Select high-quality mica ore as raw material, and obtain mica powder that meets the requirements after crushing and screening.

[0041] S2. Raw material mixing: Add mica powder, high-temperature resistant resin, refractory fiber and flame retardant into mixing hopper 5 and mix evenly for later use.

[0042] S3, Rotary feeding: The lower metal mesh is conveyed into the pressing trough 2 by the first conveyor belt 6, and then the processing seat 1 rotates 90 degrees counterclockwise. The material in the mixing bin 5 is conveyed into the pressing trough 2 by the transverse auger 4. Then the processing seat 1 rotates 90 degrees counterclockwise again. The upper metal mesh is conveyed into the pressing trough 2 by the second conveyor belt 7. Then the processing seat 1 rotates 90 degrees counterclockwise to rotate the pressing trough 2 to directly below the pressing assembly 9.

[0043] S4. Pressing and molding: The lower metal mesh, mixed material and upper metal mesh in the pressing groove 2 are pressed by the pressing component 9 to obtain the mica gasket semi-finished product. After the mica gasket semi-finished product is pushed out of the pressing groove 2, the pushing component 3 pushes the mica gasket semi-finished product onto the third conveyor belt 8 and conveys it to the next processing stage.

[0044] S5. Curing treatment: The pressed gasket semi-finished product is cured to improve its fire resistance, heat insulation performance and mechanical strength.

[0045] The processing base 1 includes a fixed base 11, an annular groove 12, a servo motor 13 and a movable plate 14. The fixed base 11 has an annular groove 12 on its top, and the servo motor 13 is fixedly installed at the center of the top of the fixed base 11. The output shaft of the servo motor 13 is fixedly connected to the movable plate 14 through a coupling.

[0046] The processing base 1 includes a support slide rod 15. The top end of the support slide rod 15 is fixedly connected to the bottom of the movable disk 14. The support slide rod 15 is arranged in a ring array at equal intervals. The bottom dimension of the support slide rod 15 is completely matched with the internal dimension of the annular groove 12. The movable disk 14 forms a sliding structure with the fixed base 11 through the support slide rod 15 and the annular groove 12.

[0047] The processing base 1 also includes a first lifting cylinder 16, a slot support 17, a cross 18, and a top seat 19. The first lifting cylinder 16 is fixedly installed on the top of the movable plate 14, and the top of the lifting cylinder 16 is fixedly connected to the slot support 17. The top of the movable plate 14 is fixedly connected to the cross 18, and the top of the cross 18 is fixedly connected to the top seat 19. The top seat 19 is fixed directly above the movable plate 14 by the cross 18.

[0048] The number of pressing grooves 2 and the number of first lifting cylinders 16 are both four, and the four pressing grooves 2 and the four first lifting cylinders 16 are set one-to-one. The shape and size of the pressing grooves 2 and the shape and size of the groove support 17 are matched with each other, and the groove support 17 is located inside the pressing grooves 2.

[0049] The specific operation is as follows: The servo motor 13 drives the movable plate 14 to rotate, thereby driving the top seat 19 to rotate, thus changing the position of the pressing groove 2. The position of the pressing groove 2 closest to the first conveyor belt 6 is defined as the initial position. Any pressing groove 2 can return to the initial position after four counterclockwise 90-degree rotations. The first conveyor belt 6 can transport the lower metal mesh into the pressing groove 2 at the initial position. Then, driven by the servo motor 13, the top seat 19 rotates 90 degrees counterclockwise. At this time, the pressing groove 2 containing the lower metal mesh is rotated and sent to the direct below the discharge port of the transverse auger 4. The transverse auger 4 is started, and the mixed material in the mixing bin 5 is transported into the pressing groove 2 and covered by the lower metal mesh. Then, the servo motor 13 controls the top seat 19 to rotate 90 degrees counterclockwise again. At this time, the pressing groove 2 containing the lower metal mesh and the mixed material is rotated and sent to the position closest to the second conveyor belt 7. The second conveyor belt 7 then transports the upper metal mesh into the pressing groove 2 and covers it. After the mixture is placed on top and all feeding is completed, the top seat 19 rotates 90 degrees counterclockwise for the third time under the drive of the servo motor 13, rotating the pressing groove 2 to directly below the pressing component 9. After being pressed and shaped by the pressing component 9, the mica gasket semi-finished product is obtained. After the semi-finished product is removed, the top seat 19 rotates 90 degrees clockwise for the fourth time to return to the initial position. The rotation of the top seat 19 controlled by the servo motor 13 can drive the pressing groove 2 to rotate and switch between four operating positions, so that three feeding operations and one pressing operation can be carried out simultaneously, realizing uninterrupted preparation of mica gaskets and greatly improving the preparation efficiency of mica gaskets. In addition, during the rotation feeding process, while the servo motor 13 drives the movable disk 14 to rotate, it will drive the bottom end of the support slide rod 15 to slide along the inner side of the annular groove 12. This design not only restricts the rotational movement trajectory of the movable disk 14, but also supports the movable disk 14, which is conducive to improving the rotational stability of the movable disk 14 and the top seat 19.

[0050] The pusher assembly 3 includes a fixed base 31, an electric push rod 32 and a guide cover 33. The fixed base 31 is fixed at the top center of the top seat 19, and the electric push rod 32 is fixedly connected to the outer wall of the fixed base 31. One end of the electric push rod 32 is fixedly connected to the guide cover 33.

[0051] There are four electric actuators 32, and the angle between two adjacent electric actuators 32 is ninety degrees.

[0052] The pressing assembly 9 includes a second lifting cylinder 91, a fixed plate 92 and a pressure sensor 93. The bottom end of the second lifting cylinder 91 is fixedly connected to the fixed plate 92, and the pressure sensor 93 is installed at the bottom of the fixed plate 92.

[0053] The pressing assembly 9 also includes a spring 94, a pressing plate 95 and a guide rod 96. The top end of the spring 94 is fixedly connected to the bottom of the fixed plate 92, and the bottom end of the spring 94 is fixedly connected to the pressing plate 95. The top of the pressing plate 95 is vertically fixed to the guide rod 96, and the guide rod 96 passes through the center of the inner side of the spring 94 and forms a through structure with the fixed plate 92.

[0054] The specific operation is as follows: the second lifting cylinder 91 drives the fixed plate 92 to move downward, thereby driving the pressing plate 95 to move downward, pressing the lower metal mesh, mixed material, and upper metal mesh in the pressing groove 2, pressing them into a whole to obtain the mica gasket semi-finished product. During this process, as the pressing plate 95 moves downward, the pressure sensor 93 will synchronously sense the change in pressing force. At the same time, the spring 94 is compressed by force, and the fixed plate 92 and the pressing plate 95 continuously approach each other under the guidance and restriction of the guide rod 96. When the pressure sensor 93 senses that the downward pressure has reached the set value, the second lifting cylinder 91 will stop the downward pressing operation and stand still for a few seconds to complete the pressing and forming operation. At this time, the mica gasket semi-finished product is located in the pressing groove. Inside the pressing groove 2, the first lifting cylinder 16 drives the slot support 17 to move upward, pushing the mica gasket semi-finished product out from the inside of the pressing groove 2. Then, the electric push rod 32 drives the guide cover 33 to move horizontally towards the third conveyor belt 8, pushing the mica gasket semi-finished product to the top of the third conveyor belt 8. It is then sent to the next processing stage via the third conveyor belt 8. Through the combined use of the above structures, the problem of excessive or insufficient pressing force can be effectively avoided, ensuring that the pressing force is moderate, thereby improving the yield of mica gaskets. In addition, the pusher component 3, in conjunction with the third conveyor belt 8, can realize the unloading operation of the mica gasket semi-finished product and send it to the subsequent processing stage, which helps to further improve the preparation efficiency of mica gaskets.

[0055] The embodiments of the present invention are given for illustrative and descriptive purposes only, and are not intended to be exhaustive or to limit the invention to the forms disclosed. Many modifications and variations will be apparent to those skilled in the art. The embodiments were chosen and described in order to better illustrate the principles and practical application of the invention, and to enable those skilled in the art to understand the invention and to design various embodiments with various modifications suitable for a particular purpose.

Claims

1. A method for preparing a fireproof and heat-insulating mica gasket, applicable to fireproof and heat-insulating mica gaskets, wherein the fireproof and heat-insulating mica gasket includes a gasket body, an upper metal mesh is pressed and fixed to the top of the gasket body, and a lower metal mesh is pressed and fixed to the bottom of the gasket body, the gasket body is formed by mixing and pressing mica powder, high-temperature resistant resin adhesive, fire-resistant fiber, and flame retardant, and wherein the mass ratio of mica powder, high-temperature resistant resin adhesive, fire-resistant fiber, and flame retardant is 5.5:2.5:1.2:0.8, characterized in that... Includes the following steps: S1. Raw material preparation: Select high-quality mica ore as raw material, and obtain mica powder that meets the requirements after crushing and screening. S2. Raw material mixing: Mix mica powder, high-temperature resistant resin, refractory fiber and flame retardant into mixing silo (5) and mix evenly for later use; S3, Rotary feeding: The lower metal mesh is conveyed into the pressing trough (2) by the first conveyor belt (6), and then the processing seat (1) rotates 90 degrees counterclockwise. The material in the mixing bin (5) is conveyed into the pressing trough (2) by the transverse auger (4). Then the processing seat (1) rotates 90 degrees counterclockwise again. The upper metal mesh is conveyed into the pressing trough (2) by the second conveyor belt (7). Then the processing seat (1) rotates 90 degrees counterclockwise to rotate the pressing trough (2) to the position directly below the pressing assembly (9). S4, Pressing and molding: Press the lower metal mesh, mixed material and upper metal mesh in the pressing groove (2) by pressing component (9) to obtain mica gasket semi-finished product. After the mica gasket semi-finished product is pushed out of the pressing groove (2), the mica gasket semi-finished product is pushed to the third conveyor belt (8) by pushing component (3) and conveyed to the next processing stage. S5. Curing treatment: The pressed gasket semi-finished product is cured to improve its fire resistance, heat insulation performance and mechanical strength.

2. The method for preparing a fireproof and heat-insulating mica gasket according to claim 1, characterized in that, The processing base (1) includes a fixed base (11), an annular groove (12), a servo motor (13) and a movable plate (14). The fixed base (11) has an annular groove (12) on its top, and the servo motor (13) is fixedly installed at the center of the top of the fixed base (11). The output shaft of the servo motor (13) is fixedly connected to the movable plate (14) through a coupling.

3. The method for preparing a fireproof and heat-insulating mica gasket according to claim 2, characterized in that, The processing base (1) includes a support slide rod (15). The top end of the support slide rod (15) is fixedly connected to the bottom of the movable disk (14). The support slide rods (15) are arranged in a ring array at equal intervals. The bottom dimension of the support slide rod (15) is completely matched with the internal dimension of the annular groove (12). The movable disk (14) forms a sliding structure with the fixed base (11) through the support slide rod (15) and the annular groove (12).

4. The method for preparing a fireproof and heat-insulating mica gasket according to claim 3, characterized in that, The processing base (1) also includes a first lifting cylinder (16), a slot support (17), a cross (18), and a top seat (19). The first lifting cylinder (16) is fixedly installed on the top of the movable plate (14), and the top of the lifting cylinder (16) is fixedly connected to the slot support (17). The top of the movable plate (14) is fixedly connected to the cross (18), and the top of the cross (18) is fixedly connected to the top seat (19). The top seat (19) is fixed directly above the movable plate (14) by the cross (18).

5. The method for preparing a fireproof and heat-insulating mica gasket according to claim 4, characterized in that, The number of pressing grooves (2) and the number of first lifting cylinders (16) are both four, and the four pressing grooves (2) are set one-to-one with the four first lifting cylinders (16). The shape and size of the pressing grooves (2) are matched with the shape and size of the groove support (17), and the groove support (17) is located inside the pressing grooves (2).

6. The method for preparing a fireproof and heat-insulating mica gasket according to claim 5, characterized in that, The feeding assembly (3) includes a fixed base (31), an electric push rod (32) and a guide cover (33). The fixed base (31) is fixed at the top center of the top seat (19), and the electric push rod (32) is fixedly connected to the outer wall of the fixed base (31), and the guide cover (33) is fixedly connected to one end of the electric push rod (32).

7. The method for preparing a fireproof and heat-insulating mica gasket according to claim 6, characterized in that, The number of electric push rods (32) is four, and the included angle between two adjacent electric push rods (32) is ninety degrees.

8. The method for preparing a fireproof and heat-insulating mica gasket according to claim 7, characterized in that, The pressing assembly (9) includes a second lifting cylinder (91), a fixed plate (92) and a pressure sensor (93). The bottom end of the second lifting cylinder (91) is fixedly connected to the fixed plate (92), and the bottom of the fixed plate (92) is equipped with a pressure sensor (93).

9. The method for preparing a fireproof and heat-insulating mica gasket according to claim 8, characterized in that, The pressing assembly (9) also includes a spring (94), a pressing plate (95) and a guide rod (96). The top end of the spring (94) is fixedly connected to the bottom of the fixed plate (92), and the bottom end of the spring (94) is fixedly connected to the pressing plate (95). The top of the pressing plate (95) is vertically fixed with the guide rod (96), and the guide rod (96) passes through the center of the inner side of the spring (94) and forms a through structure with the fixed plate (92).

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