High-temperature-resistant organic silicon rubber composition as well as preparation equipment and preparation process thereof

Abstract

The invention relates to a high-temperature-resistant organic silicon rubber composition and preparation equipment and a preparation process thereof, and relates to the technical field of organic silicon material preparation, the high-temperature-resistant organic silicon rubber composition comprises a ball mill, mixing equipment, forming equipment and vulcanizing equipment, the ball mill is used for grinding and uniformly mixing raw materials of the high-temperature-resistant organic silicon rubber composition; the mixing equipment is used for mixing and stirring the mixed raw materials and the compounding agent to form a uniform rubber material; the forming equipment is used for pressing and forming the rubber material; and the vulcanization equipment is used for carrying out secondary vulcanization on the molded product, so that rubber molecules are subjected to a cross-linking reaction to form a three-dimensional network structure, and the high-temperature-resistant organic silicon rubber composition is obtained. The device has the effects that the moving speed of the steel balls in the roller is increased, the grinding efficiency and grinding effect of the steel balls on raw materials are improved, and the production quality of the organic silicon rubber composition is improved.

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 usually involves various raw materials, such as silicone, silanol, silane and other silicone raw materials and other additives. These raw materials often need to be crushed and dispersed before mixing and reacting to ensure that they can be evenly mixed and fully reacted. The ball mill can impact, grind and mix the raw materials through high-speed rotating balls, which can effectively crush the raw materials to the required particle size and make them evenly dispersed.

[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 easy to rotate 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, they will have a grinding effect. 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 moving 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 the first aspect, the present application provides a preparation device for a high temperature resistant silicone rubber composition, which adopts the following technical solution: A preparation device for a high temperature resistant organic silicone rubber composition, comprising: a ball mill, the ball mill is used to grind and mix raw materials, the ball mill comprises a cylinder and a driving source for controlling the rotation of the cylinder, one end of the cylinder is provided with a feed port, the other end of the cylinder is provided with a discharge port, a plurality of steel balls are provided in the cylinder, a plurality of open grooves are provided on the outer peripheral wall of the cylinder, a baffle plate is hinged to the side wall of the open groove, and one end of the baffle plate can rotate toward the inner cavity of the cylinder; A driving assembly is arranged above the ball mill, and the driving assembly is used to drive the baffle plate to rotate; 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 material; A molding device, wherein the molding device is used to press the rubber material into shape; The vulcanization equipment is used to perform secondary vulcanization on the molded product, so that the rubber molecules undergo cross-linking reaction to form a three-dimensional network structure to obtain a high-temperature resistant organic silicone rubber composition.

[0006] Optionally, a receiving groove is provided on the peripheral wall of the opening groove, 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, and the limiting member is used to limit the rotation of the blocking plate at the receiving groove.

[0007] Optionally, the limiting member is a torsion spring, and the torsion spring is arranged at the hinge of the blocking plate.

[0008] Optionally, the driving assembly includes an air storage tank, one end of which is connected to an exhaust pipe, and an output end of the exhaust pipe faces an open groove at the top of the cylinder.

[0009] Optionally, inert gas is stored in the gas storage tank.

[0010] Optionally, a pressure detection component is provided in the cylinder, and an exhaust port is provided at one end of the cylinder.

[0011] 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.

[0012] Optionally, a plurality of breaking ropes are provided on the outer surface of the steel ball.

[0013] On the other hand, the present application provides a process for preparing a high temperature resistant silicone rubber composition, comprising the following steps: S1. The organic silicone rubber composition is put into the drum from the feed port. The driving source drives the drum to rotate. The steel ball moves along the side wall of the drum under the action of centrifugal force. When the steel ball moves to the top of the drum, the exhaust pipe exhausts gas toward the open groove at the top of the drum. The gas can blow the baffle plate at the top of the drum, so that the baffle plate rotates along the hinge point, and exerts thrust on the steel ball moving to the top of the inner cavity of the drum, so that the steel ball falls from the top of the drum. The contact friction between the steel ball and the raw material during the movement and the impact force of the falling steel ball on the raw material can crush the raw material and make it evenly dispersed. S2, the crushed raw materials are discharged from the discharge port and put into a mixing device with a compounding agent, and the mixing device evenly mixes the raw materials and the compounding agent to form a rubber compound; S3, the mixed rubber particles are parked for a period of time to allow 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 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.

[0014] 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.

[0015] In summary, the present application includes at least one of the following beneficial technical effects: 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 at 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 on 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 that the collision frequency and collision strength 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 can not only improve the uniformity of grinding, but also reduce 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 can be generated, which helps to crush harder raw material particles; finally, when the steel balls move to the top of the cylinder, the baffle plate can knock the steel balls down. The baffle plate provides thrust to the steel balls, as well as 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; 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 make the baffle plate rotate, making it difficult for the steel balls to make circular motion along the peripheral 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, part of the inert gas can enter the cylinder through the open groove. During the ball milling process, the steel balls and the inner wall of the cylinder continuously collide and rub, causing the temperature to rise. The raw material particles in the cylinder are refined, increasing their free energy, and may then undergo oxidation reactions with the oxygen in the cylinder. The 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 the 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. 3. Inert gas is filled into the cylinder to increase the pressure inside the cylinder moderately. 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 the grinding efficiency and shortening the grinding time; on the other hand, under moderate pressure, the distribution of the raw materials in the cylinder is more uniform, reducing the accumulation of raw materials and dead corners, which helps the raw materials to contact with the steel balls more fully and improve the grinding effect; 4. The exhaust port can first exhaust 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 easy to undergo oxidation reaction, and 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 is opened to discharge the gas in the cylinder, so that the pressure in the cylinder is always within a fixed value range, avoiding excessive pressure in the cylinder, which may cause the cylinder to explode; 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 opens and the torsion spring deforms. 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

[0016] 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; Figure 2 is a schematic diagram of the cross-sectional structure of the barrel discharge port in Example 1 of the present application; Figure 3 This is a schematic diagram showing the internal cross-sectional structure of the cylinder according to Example 1 of the present application.

[0017] Explanation of the reference numerals in the accompanying drawings: 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. containing groove; 23. baffle plate; 24. elastic pad; 25. limiter; 3. driving assembly; 31. gas storage 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

[0018] The following is combined with Figure 1 -Attached Figure 3 , further details of this application are given. Example 1

[0019] This embodiment provides a preparation device for a high temperature resistant organic 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 put into the mixer for mixing. The purpose of mixing is to evenly mix various raw materials to form a uniform rubber material. The molding device includes a molding mold, and the rubber material is put into 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 the temperature uniformity and stability during the vulcanization process. The molded product is placed in the vulcanizing tank for secondary vulcanization, so that the rubber molecules with a linear structure form a three-dimensional network structure through a cross-linking reaction to obtain a high temperature resistant silicone rubber composition.

[0020] 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 arranged at both ends of the cylinder 11. The cylinder 11 is rotatably arranged between the two bearing seats 13. A driven gear 113 is sleeved and fixedly connected at one end of the cylinder 11. The driving source 12 is a motor. A coupling 121 and a reducer 122 are sequentially sleeved at the driving end of the driving source 12. A bearing rod 123 is rotatably arranged at one end of the reducer 122. A driving gear 124 meshing with the driven gear 113 is connected to the end of the bearing rod 123 away from the reducer 122.

[0021] When the driving source 12 is started, the coupling 121 and the reducer 122 transmit the transmission to make the bearing rod 123 rotate, and the driving gear 124 rotates together with the bearing rod 123, thereby driving the cylinder 11 driven by the same gear to rotate.

[0022] 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. The raw material is put into the cylinder 11 through the feeder 14, and the cylinder 11 is driven by the driving source 12 to rotate. The steel balls 16 rub, collide and impact with the raw material in the cylinder 11, and the raw material is ground and mixed, and then discharged from the discharge port 112 through the discharge screw 15.

[0023] Reference Figure 3The outer peripheral wall of the cylinder 11 is provided with a plurality of opening grooves 21 which are connected to the inner cavity of the cylinder 11. The inner wall of the cylinder 11 is provided with a receiving groove 22 which is connected to the opening groove 21. A blocking plate 23 is rotatably arranged in the receiving groove 22. One end of the blocking plate 23 is hinged on the two opposite side walls of the receiving groove 22. The blocking plate 23 can fill and close the receiving groove 22. A layer of elastic pad 24 is arranged on the peripheral side wall of the blocking plate 23. The elastic pad 24 fills the gap between the blocking plate 23 and the side wall of the receiving groove 22, thereby reducing the possibility of the raw material falling into the gap between the blocking plate 23 and the side wall of the receiving groove 22, thereby reducing the waste of raw materials. A limiting member 25 is arranged on the side wall of the receiving groove 22. The limiting member 25 is used to limit the blocking plate 23 in the receiving groove 22, and reduce the rotation of the blocking plate 23 toward the inner cavity of the cylinder 11 under the action of gravity. In this embodiment, the limiting member 25 is a torsion spring, and the torsion spring is arranged at the hinge of the blocking plate 23.

[0024] 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 arranged above the cylinder 11. The driving assembly 3 is used to apply a force to the blocking plate 23 in the direction of the axis of the cylinder 11. 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.

[0025] When the driving source 12 drives the cylinder 11 to rotate, the steel ball 16 moves on the inner wall of the cylinder 11 under the action of centrifugal force. When the steel ball 16 moves to the top of the cylinder 11, the driving component 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 thus generates thrust on the steel ball 16 and the raw material, and changes the movement route of the steel ball 16 and the raw material in the cylinder 11, causing the steel ball 16 and the raw material to fall downward from the top of the cylinder 11, causing the steel ball 16 to generate impact force on the raw material at the bottom of the cylinder 11, crushing the raw material. When the steel ball 16 moves on the inner wall of the cylinder 11, it is in a rolling state. When the steel ball 16 keeps rolling during the falling process, the crushing rope 17 is subjected to the centrifugal force and keeps rotating with the steel ball 16 during the falling process. The crushing rope 17 strikes the material around the steel ball 16, making the material crushed more thoroughly.

[0026] In the conventional ball mill 1, the rotation speed of the cylinder 11 is controlled so that the centrifugal force on the steel balls 16 is small. When the steel balls 16 are lifted to a certain height, they will form a parabolic moving trajectory under the action of their own gravity and centrifugal force, thereby impacting and crushing the raw materials at the bottom of the cylinder 11. In this embodiment, the faster the rotation speed of the cylinder 11, the greater the centrifugal force generated on the steel balls 16, so that the steel balls 16 can move to the top of the cylinder 11, and then the movement trajectory of the steel balls 16 is changed by the blocking plate 23, so that the steel balls 16 fall.

[0027] First, due to the increased centrifugal force on the steel ball 16, the steel ball 16 moves faster in the cylinder 11, which increases the collision frequency and collision strength between the steel ball 16 and the raw material. The high-intensity collision helps the raw material to be ground and refined faster, thereby improving the grinding efficiency of the raw material. Second, the rapid movement of the steel ball 16 helps the raw material to be more evenly distributed and mixed in the cylinder 11, which can not only improve the uniformity of grinding, but also reduce the problem of local over-grinding or insufficient grinding caused by uneven distribution of raw materials. Third, the baffle plate 23 can apply thrust to the steel ball 16 and change the direction of movement of the steel ball 16, causing the steel ball 16 to fall. Due to the gravitational potential energy of the steel ball 16 when it falls, the thrust of the baffle plate 23, and the energy of the steel ball 16 moving in the cylinder 11, the falling speed of the steel ball 16 is accelerated, and the impact force on the raw material at the bottom of the cylinder 11 is stronger, which helps to break harder raw material particles, further improving the crushing ability of the raw material. Fourthly, the baffle plate 23 can not only exert thrust on the steel ball 16, but also exert thrust on the raw material moved to the top of the cylinder 11, thereby strengthening the collision strength between the raw material and the steel ball 16 during the falling process, and further enhancing the crushing effect of the raw material.

[0028] The torsion spring acts as a limit on the baffle plate 23. When the driving component 3 removes the force applied to the baffle plate 23, the torsion spring drives the baffle plate 23 to rotate in the opposite direction until the baffle 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 baffle plate 23 and the side wall of the receiving groove 22, making it difficult for the raw material to fall into the gap between the baffle plate 23 and the side wall of the receiving groove 22, thereby wasting the raw material.

[0029] Reference Figure 2 and Figure 3 The drive assembly 3 includes a gas storage tank 31 disposed on one side of the cylinder 11. The gas storage tank 31 stores 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. Sealed bearings 34 are disposed at both ends of the cylinder 11. A sealing ring 33 is disposed 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 the 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 disposed in the cylinder 11. An exhaust port 41 is opened at one end of the cylinder 11. A valve 42 is disposed at one end of the cylinder 11 for opening and closing the exhaust port 41.

[0030] The exhaust pipe 32 can discharge the inert gas stored in the gas tank 31 toward the open slot 21 at the top of the cylinder 11. The impact force of the inert gas when discharged can cause the baffle plate 23 to rotate around the hinge axis, thereby opening the open slot 21. When the baffle plate 23 rotates toward the inside of the cylinder 11, it can apply thrust to the steel ball 16 that moves to the top of the cylinder 11, changing the movement trajectory of the steel ball 16. At the same time, the inert gas can enter the cylinder 11 along the open slot 21. During the ball milling process, the steel ball 16 and the inner wall of the cylinder 11 continuously collide and rub, causing the temperature to rise. The raw material particles in the cylinder 11 are refined to increase their free energy, and then they may react with the oxygen in the cylinder 11. The 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 the inert gas can reduce the friction coefficient in the cylinder 11, thereby reducing the heat generated by friction and the heat loss of the raw materials.

[0031] In addition, the inert gas is filled into the cylinder 11, which can appropriately increase the pressure inside the cylinder 11. On the one hand, the appropriate 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 the grinding efficiency and shortening the grinding time. On the other hand, under appropriate pressure, the distribution of the raw materials in the cylinder 11 is more uniform, reducing the accumulation of raw materials and dead corners, which helps the raw materials to contact with the steel balls 16 more fully, and improves the grinding effect.

[0032] 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.

[0033] 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 the inert gas into the cylinder 11, discharge the air in the cylinder 11, close the valve 42, and fill the cylinder 11 with the inert gas.

[0034] The organic silicone rubber composition is then put 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 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, so that the baffle plate 23 rotates toward the inner cavity of the cylinder 11, and the baffle plate 23 applies a thrust to the steel balls 16 moving to the top of the inner cavity of the cylinder 11, thereby changing the movement trajectory of the steel balls 16, so that the steel balls 16 fall from the top of the cylinder 11, impacting the raw materials at the bottom of the cylinder 11, and grinding the raw materials.

[0035] As the moving speed of the steel ball 16 in the cylinder 11 increases, the collision frequency and collision force between the steel ball 16 and the raw material are enhanced, and the high-intensity collision helps the raw material to be ground and refined faster, thereby improving the grinding efficiency of the raw material. When the steel ball 16 falls, the blocking plate 23 applies a thrust to the steel ball 16, increasing the falling speed of the steel ball 16, strengthening the impact force of the steel ball 16 when it falls, and further improving the crushing effect on the raw material.

[0036] 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

[0037] This embodiment provides a preparation process of a high temperature resistant silicone rubber composition, comprising the following steps: S1. First, control the valve 42 to open the exhaust port 41, and operate the exhaust pipe 32 to discharge the inert gas into the cylinder 11, discharge the air in the cylinder 11, and close the valve 42 to fill the cylinder 11 with inert gas. Then, put the organic silicone rubber composition 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 move along the side wall of the cylinder 11 under the action of centrifugal force. At the same time, the exhaust pipe 32 is opened to spray toward the opening groove 21. When the steel balls 16 and the raw materials 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 and the raw materials that move to the top of the inner cavity of the cylinder 11, thereby changing the movement trajectory of the steel balls 16 and the raw materials, causing the steel balls 16 and the 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.

[0038] S2, putting the ground and mixed raw materials and compounding agents into a mixer for mixing, and the mixer evenly mixes the raw materials and compounding agents to form a rubber compound.

[0039] 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, and then the rubber particles after standing are placed in a molding mold and pressed and molded by a hydraulic press or a flat vulcanizing press.

[0040] S4. The molded product is placed in a vulcanizer and heated for secondary vulcanization, so that the rubber molecules with linear structure form a three-dimensional network structure through cross-linking reaction, thereby obtaining a high temperature resistant silicone rubber composition. Example 3

[0041] The present embodiment provides a high temperature resistant organic silicone rubber composition, the components of the organic 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 heat resistant additives, 1-10 parts of flame retardants, and 0.8% of a di-pentane vulcanizing agent in the silicone mixture. Example 4

[0042] 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

[0043] 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

[0044] 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 dipentadienyl vulcanizing agent are added to the silica gel mixture.

[0045] The embodiments of this specific implementation are all preferred embodiments of the present application, and are not intended to limit the protection scope of the present application. The same components are represented by the same figure marks. Therefore, any equivalent changes made based on the structure, shape, and principle of the present application should be included in the protection scope of the present application.

Claims

1. A preparation device for a high temperature resistant silicone rubber composition, characterized in that: include: A ball mill (1), the ball mill (1) being used for grinding and mixing raw materials, the ball mill (1) comprising a barrel (11) and a driving source (12) for controlling the rotation of the barrel (11), a feed port (111) being provided at one end of the barrel (11), a discharge port (112) being provided at the other end of the barrel (11), a plurality of steel balls (16) being provided in the barrel (11), a plurality of opening grooves (21) being provided on the outer peripheral wall of the barrel (11), a baffle plate (23) being hingedly connected to the side wall of the opening groove (21), and one end of the baffle plate (23) being capable of rotating toward the inner cavity of the barrel (11); A driving assembly (3) is arranged 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; A molding device, wherein the molding device is used to press the rubber material into shape; 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.

2. The preparation equipment of a high temperature resistant silicone rubber composition according to claim 1, characterized in that: The peripheral wall of the opening groove (21) is provided with a receiving groove (22), the blocking plate (23) can close the receiving groove (22), one end of the blocking plate (23) is connected to the side wall of the receiving groove (22), and a limiting member (25) is provided on the side wall of the receiving groove (22), and the limiting member (25) is used to limit the rotation of the blocking plate (23) at the receiving groove (22).

3. According to the equipment for preparing a high temperature resistant organic silicone rubber composition according to claim 2, the limiting member (25) is a torsion spring, and the torsion spring is arranged at the hinge of the blocking plate (23).

4. The preparation equipment of a high temperature resistant silicone rubber composition according to claim 1, characterized in that: The driving assembly (3) comprises 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 opening groove (21) at the top of the cylinder (11).

5. The preparation equipment of a high temperature resistant silicone rubber composition according to claim 4, characterized in that: The gas storage tank (31) stores inert gas.

6. The preparation equipment of a high temperature resistant silicone rubber composition according to claim 5, characterized in that: A pressure detection component (4) is arranged in the cylinder (11), and an exhaust port (41) is arranged at one end of the cylinder (11).

7. The preparation equipment of a high temperature resistant silicone rubber composition according to claim 5, 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).

8. The preparation equipment of a high temperature resistant silicone rubber composition according to claim 5, characterized in that: A plurality of breaking ropes (17) are arranged on the outer surface of the steel ball (16).

9. A process for preparing a high temperature resistant organic silicone rubber composition, using the preparation equipment for the high temperature resistant organic silicone rubber composition as claimed in any one of claims 1 to 8, 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. 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). 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, exerting a thrust on 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 steel ball (16) on the raw material when it falls 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 a 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 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.

10. A high temperature resistant organic silicone rubber composition, prepared by the preparation process of the high temperature resistant organic silicone rubber composition according to claim 9, characterized in that: The components of the organic silicone rubber composition are calculated by weight as follows: 100 parts of methyl vinyl silicone rubber, 50-100 parts of ultrafine modified aluminum hydroxide, 30-60 parts of modified fumed silica with a specific surface area of ​​at least 60 m2 / g, 0.5-5 parts of heat-resistant additives, 0.2-10 parts of flame retardants, and 0.8% of a dipentadienyl vulcanizing agent in the silicone mixture.

Images