A high-temperature resistant silicone rubber composition and its preparation equipment and preparation process

Abstract

The present application relates to a high-temperature resistant silicone rubber composition and its preparation equipment and process, and relates to the technical field of silicone material preparation. The composition includes a ball mill, a mixing device, a molding device, and a vulcanization device. The ball mill is used to grind and evenly mix the raw materials of the high-temperature resistant silicone rubber composition; the mixing device is used to mix and stir the mixed raw materials and compounding agents to form a uniform rubber compound; the molding device is used to press and shape the rubber compound; and the vulcanization device is used to perform secondary vulcanization on the molded product, causing the rubber molecules to undergo a cross-linking reaction to form a three-dimensional network structure, thereby obtaining a high-temperature resistant silicone rubber composition. The present application has the effect of increasing the movement speed of the steel balls within the drum, improving the grinding efficiency and effect of the steel balls on the raw materials, and improving the production quality of the silicone rubber composition.

Description

Technical Field

[0001] The present application relates to the technical field of preparation of organosilicon materials, and in particular to a high-temperature resistant organosilicon rubber composition and its preparation equipment and preparation process. Background Art

[0002] The preparation of silicone rubber compositions typically involves a variety of raw materials, such as silicones, silanols, silanes, and other organic silicon raw materials, as well as other additives. These raw materials often need to be crushed and dispersed before mixing and reacting to ensure uniform mixing and sufficient reaction. A ball mill uses high-speed rotating balls to impact, grind, and mix the raw materials, effectively crushing them to the desired particle size and evenly dispersing them.

[0003] During the operation of the ball mill, the rotation speed of the drum needs to be controlled to ensure that the steel balls are not easily rotated to the highest point of the drum, so that the steel balls can effectively impact the raw materials due to gravity. However, this method will limit the movement speed of the steel balls in the drum, which will weaken the impact of the steel balls on the raw materials and reduce the grinding effect. At the same time, since the steel balls will collide and rub with the raw materials during movement, the grinding effect will be achieved. However, if the movement speed of the steel balls is too low, the grinding efficiency will be reduced accordingly. Summary of the Invention

[0004] The purpose of this application is to provide a high-temperature resistant silicone rubber composition and its preparation equipment and preparation process, which can increase the movement speed of the steel balls in the drum, improve the grinding efficiency and grinding effect of the steel balls on the raw materials, and improve the production quality of the silicone rubber composition.

[0005] In a first aspect, the present application provides a device for preparing a high-temperature resistant silicone rubber composition, which adopts the following technical solution:

[0006] A preparation device for a high-temperature resistant organic silicone rubber composition, comprising: a ball mill for grinding and mixing raw materials, the ball mill comprising a barrel and a drive source for controlling the rotation of the barrel, a feed port being provided at one end of the barrel, a discharge port being provided at the other end of the barrel, a plurality of steel balls being provided within the barrel, a plurality of open slots being provided on the outer peripheral wall of the barrel, a baffle being hingedly connected to the sidewall of the open slot, one end of the baffle being rotatable toward the inner cavity of the barrel;

[0007] A driving assembly is provided above the ball mill, and the driving assembly is used to drive the baffle plate to rotate;

[0008] A mixing device, wherein the mixing device is used to mix and stir the mixed raw materials and compounding agents to form a uniform rubber compound;

[0009] Molding equipment, the molding equipment is used to press the rubber material into shape;

[0010] The vulcanization equipment is used to perform secondary vulcanization on the molded product, so that the rubber molecules undergo a cross-linking reaction to form a three-dimensional network structure, thereby obtaining a high-temperature resistant silicone rubber composition.

[0011] Optionally, a receiving groove is provided on the peripheral wall of the opening groove, and the blocking plate can close the receiving groove. One end of the blocking plate is connected to the side wall of the receiving groove, and a limiting member is provided on the side wall of the receiving groove. The limiting member is used to limit the rotation of the blocking plate at the receiving groove.

[0012] Optionally, the limiting member is a torsion spring, and the torsion spring is arranged at the hinge of the blocking plate.

[0013] Optionally, the driving assembly includes an air storage tank, one end of the air storage tank is connected to an exhaust pipe, and the output end of the exhaust pipe is directed toward an open groove at the top of the cylinder.

[0014] Optionally, inert gas is stored in the gas storage tank.

[0015] Optionally, a pressure detection component is provided in the cylinder, and an exhaust port is provided at one end of the cylinder.

[0016] Optionally, a driven gear is fixed to the outside of the cylinder, and the output end of the driving source is connected to a driving gear meshing with the driven gear.

[0017] Optionally, a plurality of breaking ropes are provided on the outer surface of the steel ball.

[0018] On the other hand, the present application provides a process for preparing a high temperature resistant silicone rubber composition, comprising the following steps:

[0019] S1. The organosilicon rubber composition is fed into the drum from the feed port. The driving source drives the drum to rotate. The steel balls are moved along the side walls of the drum by centrifugal force. When the steel balls move to the top of the drum, the exhaust pipe exhausts gas toward the open slot at the top of the drum. The gas can blow the baffle plate at the top of the drum, causing the baffle plate to rotate along the hinge point, exerting a thrust on the steel balls that have moved to the top of the drum cavity, causing the steel balls to fall from the top of the drum. The contact friction between the steel balls and the raw materials during movement and the impact force of the falling steel balls on the raw materials can crush the raw materials and evenly disperse them.

[0020] S2, the crushed raw materials are discharged from the discharge port and put into the mixing equipment with the compounding agent, and the mixing equipment uniformly mixes the raw materials and the compounding agent to form a rubber compound;

[0021] S3, the mixed rubber particles are parked for a period of time to allow the various ingredients to fully disperse and react in the rubber material, and then the parked rubber particles are placed in a molding device for compression molding;

[0022] S4. Place the molded product into a vulcanization device and heat it for secondary vulcanization. The rubber molecules undergo a cross-linking reaction to form a three-dimensional network structure, thereby obtaining a high-temperature resistant organic silicone rubber composition.

[0023] On the other hand, the present application provides a high-temperature resistant silicone rubber composition, which includes the following components in proportion by mass: 62%-78% methyl vinyl silicone rubber, 15%-20% methyl silicone oil, 5%-20% isocyanurate-DOPO polymer, 0.1%-0.15% vulcanizing agent, and 3%-3.5% co-crosslinking agent.

[0024] In summary, this application includes at least one of the following beneficial technical effects:

[0025] 1. Improve the output efficiency of the driving source, so that when the cylinder rotates, the steel balls can move to the top of the cylinder under the action of centrifugal force, and then use the driving component to drive the baffle plate on the top of the cylinder to rotate toward the inner cavity of the cylinder. During the movement, the baffle plate can apply thrust to the steel balls that move to the top of the inner cavity of the cylinder, so that the steel balls fall from the inner wall of the cylinder. The impact force of the falling steel balls can enhance the crushing effect of the raw materials; because the steel balls can move to the top of the cylinder, the energy of the steel balls is greater than that of the steel balls in conventional ball mills, and the moving speed is faster, so the collision frequency and collision force between the steel balls and the raw materials will be enhanced, and the high-intensity collision helps the raw materials to be crushed faster. Grinding and refining, thereby improving the grinding efficiency of raw materials; on the other hand, the rapid movement of the steel balls helps to distribute and mix the raw materials more evenly in the cylinder, which not only improves the uniformity of grinding, but also reduces the problem of local over-grinding or under-grinding caused by uneven distribution of raw materials; secondly, the faster the movement of the steel balls, the greater the impact force they can generate, which helps to crush harder raw material particles; finally, when the steel balls move to the top of the cylinder, the baffle can knock the steel balls down. The baffle provides thrust to the steel balls, and the kinetic energy carried by the steel balls themselves, thereby increasing the impact force of the steel balls falling and further enhancing the crushing effect on the raw materials;

[0026] 2. The inert gas stored in the gas tank is discharged toward the baffle plate through the exhaust pipe. On the one hand, the impact force of the inert gas can cause the baffle plate to rotate, making it difficult for the steel balls to make circular motion along the circumferential wall of the cylinder. At the same time, the baffle plate can exert thrust on the steel balls during the rotation process, thereby increasing the impact force of the steel balls falling. On the other hand, some inert gas can enter the cylinder through the open groove. During the ball milling process, the steel balls continuously collide and rub against the inner wall of the cylinder, causing the temperature to rise. The raw material particles in the cylinder are refined, causing their free energy to increase, which may cause oxidation reactions with the oxygen in the cylinder. Inert gas is not easy to react with other substances, which can effectively reduce the occurrence of such oxidation reactions, protect the properties of the raw materials from being affected, and help improve the production quality of the silicone rubber composition. At the same time, the filling of inert gas can reduce the friction coefficient in the cylinder, thereby reducing the heat generated by friction and the heat loss of the raw materials.

[0027] 3. Inert gas is filled into the cylinder, which can moderately increase the pressure inside the cylinder. On the one hand, the moderate pressure increase can enhance the collision force between the grinding balls and the raw materials, thereby more effectively crushing and grinding the raw materials, improving grinding efficiency and shortening grinding time; on the other hand, under moderate pressure, the distribution of raw materials in the cylinder is more uniform, reducing the accumulation of raw materials and dead corners, helping the raw materials to contact with the steel balls more fully, and improving the grinding effect;

[0028] 4. The exhaust port can first evacuate the air in the cylinder and discharge the inert gas into the cylinder through the gas storage tank, so that the raw materials in the cylinder are not easily oxidized. The pressure detection component can monitor the pressure in the cylinder in real time. When the pressure in the cylinder is too high, the exhaust port will be opened to discharge the gas in the cylinder, so that the pressure in the cylinder is always within a fixed value range, avoiding the situation where the pressure in the cylinder is too high and causes the cylinder to explode;

[0029] 5. The torsion spring can limit the baffle plate, so that the baffle plate closes the open slot. When the baffle plate rotates with the cylinder to align with the exhaust pipe, the gas discharged from the exhaust pipe can push the baffle plate to rotate, so that the open slot is opened and the torsion spring is deformed. When the baffle plate loses the gas push from the exhaust pipe, the torsion spring recovers and drives the baffle plate to close the open slot. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] Figure 1 This is a schematic diagram of the overall structure of a preparation device for a high-temperature resistant organic silicone rubber composition according to Example 1 of the present application;

[0031] Figure 2 1 is a schematic diagram showing the cross-sectional structure of the barrel discharge port in Example 1 of the present application;

[0032] Figure 3 This is a schematic diagram showing the internal cross-sectional structure of the cylinder in Example 1 of the present application.

[0033] Explanation of the accompanying symbols: 1. Ball mill; 11. Cylinder; 111. Feed port; 112. Discharge port; 113. Driven gear; 12. Driving source; 121. Coupling; 122. Reducer; 123. Bearing rod; 124. Driving gear; 13. Bearing seat; 14. Feeder; 15. Discharge screw; 16. Steel ball; 17. Breaking rope; 21. Opening groove; 22. Receiving groove; 23. Blocking plate; 24. Elastic pad; 25. Limiting member; 3. Driving assembly; 31. Gas tank; 32. Exhaust pipe; 33. Sealing ring; 34. Sealing bearing; 4. Pressure detection component; 41. Exhaust port; 42. Valve; 5. Mixing equipment; 6. Vulcanizing equipment. DETAILED DESCRIPTION

[0034] The following is combined with Figure 1 -Attached Figure 3 , further details of this application are given. Example 1

[0035] This embodiment provides a preparation device for a high temperature resistant silicone rubber composition, referring to Figure 1 , including a ball mill 1, a mixing device 5, a molding device and a vulcanizing device 6, wherein the ball mill 1 is used to grind and evenly mix the raw materials of the high-temperature resistant silicone rubber composition. The mixing device 5 includes a mixer, and the ground and mixed raw materials and compounding agents are placed in the mixer for mixing. The purpose of mixing is to evenly mix the various raw materials to form a uniform rubber compound. The molding device includes a molding mold, and the rubber compound is placed in the molding mold and pressed and molded by a hydraulic press or a flat vulcanizing press. The vulcanizing device 6 includes a vulcanizing tank, and the vulcanizing tank is equipped with a heating system to ensure temperature uniformity and stability during the vulcanization process. The molded product is placed in the vulcanizing tank for secondary vulcanization, so that the linear rubber molecules form a three-dimensional network structure through a cross-linking reaction to obtain a high-temperature resistant silicone rubber composition.

[0036] Reference Figure 1 and Figure 2 The ball mill 1 includes a cylinder 11 and a driving source 12 for driving the cylinder 11 to rotate. Bearing seats 13 are provided at both ends of the cylinder 11. The cylinder 11 is rotatably arranged between the two bearing seats 13. One end of the cylinder 11 is sleeved and fixedly connected with a driven gear 113. The driving source 12 is a motor. The driving end of the driving source 12 is sequentially sleeved with a coupling 121 and a reducer 122. A bearing rod 123 is rotatably provided at one end of the reducer 122. The end of the bearing rod 123 away from the reducer 122 is connected to a driving gear 124 meshing with the driven gear 113.

[0037] When the driving source 12 is started, the coupling 121 and the reducer 122 transmit power to rotate the bearing rod 123 , and the driving gear 124 rotates along with the bearing rod 123 , thereby driving the cylinder 11 driven by the same gear to rotate.

[0038] Reference Figures 1 to 3 A feed port 111 is provided at one end of the cylinder 11, a feeder 14 is provided at the feed port 111, a discharge port 112 is provided at the other end of the cylinder 11, a discharge screw 15 is provided in the discharge port 112, and a plurality of steel balls 16 are provided in the inner cavity of the cylinder 11. Raw materials are fed into the feeder 14 and enter the cylinder 11. The driving source 12 drives the cylinder 11 to rotate. The steel balls 16 rub, collide and impact with the raw materials in the cylinder 11, grinding and mixing the raw materials. After that, the raw materials are discharged from the discharge port 112 through the discharge screw 15.

[0039] Reference Figure 3 The outer circumferential wall of the cylinder 11 is provided with a plurality of open slots 21 extending through the inner cavity of the cylinder 11. The inner wall of the cylinder 11 is provided with a receiving slot 22 connected to the open slots 21. A baffle plate 23 is rotatably mounted in the receiving slot 22. One end of the baffle plate 23 is hinged to two opposing side walls of the receiving slot 22. The baffle plate 23 can fill and seal the receiving slot 22. A layer of elastic pads 24 is provided on the surrounding side walls of the baffle plate 23. The elastic pads 24 fill the gap between the baffle plate 23 and the side walls of the receiving slot 22, thereby reducing the possibility of raw materials falling into the gap between the baffle plate 23 and the side walls of the receiving slot 22 and reducing the waste of raw materials. The side walls of the receiving slot 22 are provided with limit members 25. The limit members 25 are used to constrain the baffle plate 23 within the receiving slot 22 and reduce the baffle plate 23 from rotating toward the inner cavity of the cylinder 11 under the action of gravity. In this embodiment, the limit members 25 are torsion springs disposed at the hinge of the baffle plate 23.

[0040] Reference Figure 3 A plurality of breaking ropes 17 are fixedly connected to the outer surface of the steel ball 16. A driving assembly 3 is provided above the cylinder 11. The driving assembly 3 is used to apply a force toward the axis of the cylinder 11 to the blocking plate 23. The driving assembly 3 can overcome the torsional torque of the torsion spring, so that the blocking plate 23 located at the top of the cylinder 11 rotates toward the inner cavity of the cylinder 11.

[0041] When the drive source 12 drives the cylinder 11 to rotate, the steel ball 16 is acted upon by centrifugal force and moves along the inner wall of the cylinder 11. When the steel ball 16 reaches the top of the cylinder 11, the drive assembly 3 applies force to the baffle plate 23, causing the baffle plate 23 to rotate toward the inner cavity of the cylinder 11. The baffle plate 23 thereby generates thrust on the steel ball 16 and the raw material, and changes the movement path of the steel ball 16 and the raw material within the cylinder 11, causing the steel ball 16 and the raw material to fall downward from the top of the cylinder 11. This causes the steel ball 16 to exert an impact force on the raw material at the bottom of the cylinder 11, crushing the raw material. The steel ball 16 is in a rolling state as it moves along the inner wall of the cylinder 11. As the steel ball 16 continues to roll during its fall, the crushing rope 17 is acted upon by centrifugal force and continues to rotate along with the steel ball 16 during its fall. The crushing rope 17 whips the material around the steel ball 16, causing the material to be crushed more thoroughly.

[0042] In a conventional ball mill 1, the rotation speed of the cylinder 11 is controlled to minimize the centrifugal force on the steel balls 16. Once the steel balls 16 are elevated to a certain height, they are subjected to both their own gravity and the centrifugal force, forming a parabolic trajectory, thereby impacting and crushing the raw materials at the bottom of the cylinder 11. In this embodiment, however, the faster the rotation speed of the cylinder 11, the greater the centrifugal force exerted on the steel balls 16, allowing them to move to the top of the cylinder 11. The baffle 23 then changes their trajectory, causing them to fall.

[0043] First, due to the increased centrifugal force on the steel balls 16, the steel balls 16 move faster within the cylinder 11, increasing the frequency and intensity of collisions between the steel balls 16 and the raw material. These high-intensity collisions help the raw material be ground and refined more quickly, thereby improving the grinding efficiency of the raw material. Second, the rapid movement of the steel balls 16 helps distribute and mix the raw material more evenly within the cylinder 11, not only improving grinding uniformity but also reducing localized over-grinding or under-grinding caused by uneven raw material distribution. Third, the baffles 23 can exert a thrust on the steel balls 16 and change their direction of movement, causing them to fall. Due to the gravitational potential energy of the steel balls 16 during their fall, the thrust of the baffles 23, and the energy of the steel balls 16 moving within the cylinder 11, the steel balls 16 fall faster, resulting in a stronger impact on the raw material at the bottom of the cylinder 11, helping to break harder raw material particles and further improving the crushing efficiency of the raw material. Fourthly, the baffle 23 can not only apply thrust to the steel balls 16, but also apply thrust to the raw materials moved to the top of the cylinder 11, thereby increasing the collision strength between the raw materials and the steel balls 16 during the falling process and further enhancing the crushing effect of the raw materials.

[0044] The torsion spring acts as a limiter on the blocking plate 23. When the driving component 3 removes the force applied to the blocking plate 23, the torsion spring drives the blocking plate 23 to rotate in the opposite direction until the blocking plate 23 closes the opening groove 21 and presses against the wall of the receiving groove 22. At the same time, the elastic pad 24 is deformed to fill the gap between the blocking plate 23 and the side wall of the receiving groove 22, making it difficult for the raw materials to fall into the gap between the blocking plate 23 and the side wall of the receiving groove 22, resulting in waste of raw materials.

[0045] Reference Figure 2 and Figure 3 The drive assembly 3 includes a gas storage tank 31 provided on one side of the cylinder 11. The gas storage tank 31 stores an inert gas. In this embodiment, the inert gas can be argon, nitrogen, etc. One end of the gas storage tank 31 is connected to an exhaust pipe 32. The exhaust pipe 32 is located above the cylinder 11, and the exhaust port 41 of the exhaust pipe 32 faces the open groove 21 at the top of the cylinder 11. Sealing bearings 34 are provided at both ends of the cylinder 11. A sealing ring 33 is provided between the two sealing bearings 34. One end of the exhaust pipe 32 is inserted into the inner cavity of the sealing ring 33. The sealing ring 33 can reduce the situation where external gas enters the cylinder 11 or the gas in the cylinder 11 overflows when the open groove 21 is opened. A pressure detection component 4 is provided in the cylinder 11. An exhaust port 41 is provided at one end of the cylinder 11. A valve 42 is provided at one end of the cylinder 11 for opening and closing the exhaust port 41.

[0046] The exhaust pipe 32 discharges the inert gas stored in the gas tank 31 toward the open slot 21 at the top of the cylinder 11. The impact of the inert gas discharge causes the baffle plate 23 to rotate about the hinge axis, thereby opening the open slot 21. As the baffle plate 23 rotates toward the inside of the cylinder 11, it exerts a thrust on the steel balls 16 moving to the top of the cylinder 11, changing their trajectory. Simultaneously, the inert gas enters the cylinder 11 through the open slot 21. During the ball milling process, the steel balls 16 continuously collide and rub against the inner wall of the cylinder 11, causing the temperature to rise. This refines the raw material particles within the cylinder 11, increasing their free energy and potentially causing oxidation reactions with the oxygen within the cylinder 11. Since inert gas is less reactive to other substances, it effectively reduces the occurrence of such oxidation reactions, protects the raw material properties, and helps improve the production quality of the silicone rubber composition. Furthermore, the inert gas filling reduces the friction coefficient within the cylinder 11, thereby reducing frictional heat and heat loss from the raw material.

[0047] Furthermore, the inert gas introduced into the cylinder 11 moderately increases the pressure within the cylinder 11. This moderate pressure increase, on the one hand, enhances the collision force between the grinding balls and the raw material, thereby more effectively crushing and grinding the raw material, improving grinding efficiency and shortening grinding time. Furthermore, at this moderate pressure, the raw material is more evenly distributed within the cylinder 11, reducing material accumulation and dead corners, and promoting more complete contact between the raw material and the steel balls 16, thereby enhancing the grinding effect.

[0048] The pressure detection component 4 can monitor the pressure inside the cylinder 11 in real time. When the pressure inside the cylinder 11 is too high, the control valve 42 opens the exhaust port 41, thereby reducing the pressure inside the cylinder 11, so that the pressure inside the cylinder 11 is maintained at an appropriate level, avoiding the situation where the pressure inside the cylinder 11 is too high and the cylinder 11 explodes.

[0049] The implementation principle of the equipment for preparing a high-temperature resistant silicone rubber composition in this embodiment is: control the valve 42 to open the exhaust port 41, operate the exhaust pipe 32 to discharge inert gas into the cylinder 11, discharge the air in the cylinder 11, close the valve 42, and fill the cylinder 11 with inert gas.

[0050] The organic silicone rubber composition is then fed into the drum from the feed port 111, and the driving source 12 drives the cylinder 11 to rotate. The steel balls 16 and the raw materials in the cylinder 11 are moved along the side wall of the cylinder 11 by the centrifugal force, and the exhaust pipe 32 is opened at the same time to spray toward the opening groove 21. When the steel balls 16 move to the top of the cylinder 11, the ejected inert gas applies a thrust to the baffle plate 23, causing the baffle plate 23 to rotate toward the inner cavity of the cylinder 11. The baffle plate 23 applies a thrust to the steel balls 16 that move to the top of the inner cavity of the cylinder 11, thereby changing the movement trajectory of the steel balls 16, causing the steel balls 16 to fall from the top of the cylinder 11, impacting the raw materials at the bottom of the cylinder 11, and grinding the raw materials.

[0051] As the speed of the steel balls 16 increases within the cylinder 11, the frequency and intensity of collisions between the steel balls 16 and the raw material increase. These high-intensity collisions help the raw material be ground and refined more quickly, thereby improving the grinding efficiency of the raw material. As the steel balls 16 fall, the baffles 23 exert a thrust on them, increasing their falling speed and the impact force of the falling balls 16, further enhancing the crushing effect on the raw material.

[0052] When the exhaust pipe 32 is opened, the control valve 42 opens the exhaust port 41, and the pressure detection component 4 can monitor the pressure in the cylinder 11 in real time, thereby controlling the opening size of the valve 42, so that the gas pressure in the cylinder 11 is within an appropriate range, reducing the excessive pressure in the cylinder 11 and causing the cylinder 11 to explode. Example 2

[0053] This embodiment provides a preparation process of a high-temperature resistant organic silicone rubber composition, comprising the following steps:

[0054] S1. First, control the valve 42 to open the exhaust port 41, and operate the exhaust pipe 32 to discharge inert gas into the cylinder 11 to discharge the air in the cylinder 11. Close the valve 42 to fill the cylinder 11 with inert gas. Then, add the organic silicone rubber composition into the drum from the feed port 111. The driving source 12 drives the cylinder 11 to rotate. The steel balls 16 and raw materials in the cylinder 11 are moved along the side wall of the cylinder 11 by the centrifugal force. At the same time, the exhaust pipe 32 is opened to spray air toward the opening groove 21. When the steel balls 16 and raw materials move to the top of the cylinder 11, the ejected inert gas exerts a thrust on the baffle plate 23, causing the baffle plate 23 to rotate toward the inner cavity of the cylinder 11. The baffle plate 23 exerts a thrust on the steel balls 16 and raw materials that have moved to the top of the inner cavity of the cylinder 11, thereby changing the movement trajectory of the steel balls 16 and raw materials, causing the steel balls 16 and raw materials to fall from the top of the cylinder 11, impacting the raw materials at the bottom of the cylinder 11, and grinding the raw materials.

[0055] S2. The ground and mixed raw materials and compounding agents are placed in a mixer for mixing. The mixer uniformly mixes the raw materials and compounding agents to form a rubber compound.

[0056] S3. The mixed rubber particles are left standing for a period of time to allow the various compounding agents to fully disperse and react in the rubber material. The rubber particles are then placed in a molding mold and pressed into shape by a hydraulic press or a flat vulcanizing press.

[0057] S4. Place the molded product in a vulcanizer and heat it for secondary vulcanization, so that the linear rubber molecules form a three-dimensional network structure through a cross-linking reaction to obtain a high-temperature resistant silicone rubber composition. Example 3

[0058] This embodiment provides a high-temperature resistant silicone rubber composition, the components of the silicone rubber composition are, by weight, 100 parts of methyl vinyl silicone rubber, 50-100 parts of ultrafine modified aluminum hydroxide, 30-60 parts of modified fumed silica having a specific surface area of ​​at least 60 m2 / g, 0.5-5 parts of a heat-resistant additive, 1-10 parts of a flame retardant, and 0.8% of a dipentadiene-bis(2-pentadienyl) vulcanizing agent in the silicone mixture. Example 4

[0059] The difference between this embodiment and embodiment 3 is that 100 parts of polymethylvinylsiloxane, 50 parts of modified aluminum hydroxide, 50 parts of modified white carbon black, 1 part of heat-resistant additive, 1 part of flame retardant, and 0.8% of dipentadienyl vulcanizing agent are added to the silica gel mixture. Example 5

[0060] The difference between this embodiment and embodiment 4 is that 100 parts of polymethylvinylsiloxane, 60 parts of modified aluminum hydroxide, 40 parts of modified white carbon black, 0.5 parts of heat-resistant additives, 1 part of flame retardant, and 0.8% of dipentadienyl vulcanizing agent are added to the silica gel mixture. Example 6

[0061] The difference between this embodiment and embodiment 5 is that 100 parts of polymethylvinylsiloxane, 70 parts of modified aluminum hydroxide, 30 parts of modified white carbon black, 0.5 parts of heat-resistant additives, 2 parts of flame retardants, and 0.8% of a dipentadienyl vulcanizing agent are added to the silica gel mixture.

[0062] The examples of this specific embodiment are all preferred embodiments of this application and are not intended to limit the scope of protection of this application. Identical components are represented by the same reference numerals. Therefore, any equivalent changes made based on the structure, shape, and principle of this application should be included in the scope of protection of this application.

Claims

1. A preparation device for a high temperature resistant silicone rubber composition, characterized in that: include: A ball mill (1) is used for grinding and mixing raw materials, and the ball mill (1) comprises a barrel (11) and a driving source (12) for controlling the rotation of the barrel (11), a feed port (111) is provided at one end of the barrel (11), a discharge port (112) is provided at the other end of the barrel (11), a plurality of steel balls (16) are provided in the barrel (11), a plurality of opening grooves (21) are provided on the outer peripheral wall of the barrel (11), a baffle plate (23) is hingedly connected to the side wall of the opening groove (21), and one end of the baffle plate (23) can rotate toward the inner cavity of the barrel (11); A driving assembly (3) is provided above the ball mill (1), and the driving assembly (3) is used to drive the baffle plate (23) to rotate; A mixing device (5), wherein the mixing device (5) is used to mix and stir the mixed raw materials and compounding agents to form a uniform rubber material; Molding equipment, the molding equipment is used to press the rubber material into shape; Vulcanization equipment (6), the vulcanization equipment (6) is used to perform secondary vulcanization on the molded product, so that the rubber molecules undergo a cross-linking reaction to form a three-dimensional network structure, thereby obtaining a high-temperature resistant organic silicone rubber composition; The peripheral wall of the opening groove (21) is provided with an accommodating groove (22), the blocking plate (23) can close the accommodating groove (22), one end of the blocking plate (23) is hinged to the side wall of the accommodating groove (22), and the side wall of the accommodating groove (22) is provided with a limiting member (25), and the limiting member (25) is used to limit the blocking plate (23) from rotating at the accommodating groove (22); The limiting member (25) is a torsion spring, and the torsion spring is arranged at the hinge of the blocking plate (23); The driving assembly (3) includes an air storage tank (31), one end of the air storage tank (31) is connected to an exhaust pipe (32), and the output end of the exhaust pipe (32) faces the open slot (21) at the top of the cylinder (11); A plurality of breaking ropes (17) are provided on the outer surface of the steel ball (16).

2. The preparation equipment of a high temperature resistant silicone rubber composition according to claim 1, characterized in that: Inert gas is stored in the gas storage tank (31).

3. The preparation equipment of a high temperature resistant organic silicone rubber composition according to claim 2, characterized in that: A pressure detection component (4) is provided in the cylinder (11), and an exhaust port (41) is provided at one end of the cylinder (11).

4. The preparation equipment of a high temperature resistant silicone rubber composition according to claim 2, characterized in that: A driven gear (113) is fixed to the outside of the cylinder (11), and an output end of the driving source (12) is connected to a driving gear (124) meshing with the driven gear (113).

5. A process for preparing a high-temperature resistant organic silicone rubber composition, using the equipment for preparing a high-temperature resistant organic silicone rubber composition according to any one of claims 1 to 4, characterized in that: The following steps are involved: S1. The organic silicone rubber composition is fed into the drum from the feed port (111), the driving source (12) drives the drum (11) to rotate, and the steel ball (16) is moved along the side wall of the drum (11) by the centrifugal force. When the steel ball (16) moves to the top of the drum (11), the exhaust pipe (32) exhausts gas toward the open groove (21) at the top of the drum (11), and the gas can blow the baffle plate (23) at the top of the drum (11), so that the baffle plate (23) rotates along the hinge point, and applies a thrust to the steel ball (16) that moves to the top of the inner cavity of the drum (11), so that the steel ball (16) falls from the top of the drum (11). The contact friction between the steel ball (16) and the raw material during the movement and the impact force of the falling steel ball (16) on the raw material can crush the raw material and make it evenly dispersed. S2, the crushed raw material is discharged from the discharge port (112) and placed into the mixing device (5) together with the compounding agent, and the mixing device (5) uniformly mixes the raw material and the compounding agent to form a rubber compound; S3, the mixed rubber particles are parked for a period of time to allow the various ingredients to fully disperse and react in the rubber material, and then the parked rubber particles are placed in a molding device for compression molding; S4. The molded product is placed in a vulcanization device (6) and heated for secondary vulcanization. The rubber molecules undergo a cross-linking reaction to form a three-dimensional network structure, thereby obtaining a high-temperature resistant organic silicone rubber composition.

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