Preparation method of ultra-high molecular weight polyethylene flame-retardant composite material

Abstract

The invention belongs to the technical field of flame-retardant composite materials, and particularly relates to a preparation method of an ultra-high molecular weight polyethylene flame-retardant composite material, which comprises the following steps: S1, preparing base material red phosphorus, namely grinding and crushing raw material coke for preparing the red phosphorus by using a grinding and crushing machine for later use; s2, adding the prepared red phosphorus, polyethylene resin, silicon dioxide, talcum powder and additives into a stirring barrel; s3, after stirring, pouring the mixture into a reaction kettle, placing the reaction kettle in a heat preservation chamber, after reaction, pouring the mixture into a stirrer, then pouring the mixture into a mold, cooling and taking the material to prepare the ultra-high molecular weight polyethylene flame-retardant composite material; the ultra-high molecular weight polyethylene has excellent impact resistance and wear resistance, low friction coefficient and good self-lubricating property, and some flame retardant additives are added into an ultra-high molecular weight polyethylene matrix, so that the ultra-high molecular weight polyethylene composite material has flame retardant property, and is wider in application range and more in application field.

Description

Technical Field

[0001] This invention belongs to the field of flame-retardant composite material technology, specifically a method for preparing ultra-high molecular weight polyethylene flame-retardant composite material. Background Technology

[0002] Ultra-high molecular weight polyethylene (UHMWPE) generally refers to polyethylene with a viscosity-average molecular weight greater than 1.5 million. It is a highly crystalline polymer with a linear structure, exhibiting excellent impact resistance and abrasion resistance, a very low coefficient of friction, good self-lubricating properties, and also possesses excellent stress cracking resistance, chemical stability, extremely low water absorption, electrical insulation, and bioinertness. Adding flame-retardant additives to the UHMWPE matrix imparts flame-retardant properties, broadening its application range. In the production of ultra-high molecular weight polyethylene flame-retardant composite materials, some flame retardants are required, such as red phosphorus and silica. Red phosphorus melts only when heated to 590℃ under high pressure and has excellent flame-retardant properties. In the production process, coke, calcium phosphate, and silica are heated in an electric furnace to produce white phosphorus. Then, the white phosphorus is heated again in the absence of air to produce more white phosphorus. However, the coke raw material is in block form. If the block coke is directly added to the electric furnace, firstly, the coke is heated unevenly, with the outer layer reacting with calcium phosphate and silica while the inside does not receive a heating reaction; secondly, the large volume of the block coke obstructs the uniform heating of calcium phosphate and silica, resulting in uneven heating of the raw materials inside the electric furnace. This leads to long white phosphorus production time, poor quality, and affects the efficiency of the subsequent production of ultra-high molecular weight polyethylene flame-retardant composite materials.

[0003] Therefore, the present invention provides an ultra-high molecular weight polyethylene flame-retardant composite material and its preparation method. Summary of the Invention

[0004] In order to overcome the shortcomings of the prior art, at least one technical problem raised in the background art is solved.

[0005] The technical solution adopted by this invention to solve its technical problem is: the ultra-high molecular weight polyethylene flame-retardant composite material of this invention comprises the following components in parts by weight: 50-70 parts base material; Additives 45-60 parts; The base material comprises the following components in parts by weight: 35-60 parts of polyethylene resin; 25-35 parts of red phosphorus; 20-30 parts of silicon dioxide; 10-25 parts talcum powder; The additive comprises the following components in parts by weight: 20-40 parts of coupling agent; Antioxidant 30-50 parts; 45-60 parts of dispersant.

[0006] Preferably, the coupling agent is a monoalkoxy pyrophosphate type titanate coupling agent; the antioxidant is a phosphite antioxidant; and the dispersant is YY-503A plastic dispersant.

[0007] A method for preparing ultra-high molecular weight polyethylene flame-retardant composite materials, the method comprising the following steps: S1: Prepare the base material red phosphorus. Use a grinding and crushing machine to grind and crush the coke used to prepare red phosphorus. Then, put it into an electric furnace with calcium phosphate and silicon dioxide. Heat it in the electric furnace to 1400-1500℃ and react to obtain white phosphorus. Then, heat it in the absence of air to convert it into red phosphorus for later use. S2: Add the prepared red phosphorus, polyethylene resin, silica and talc powder into a mixing tank and stir to mix. During the stirring and mixing process, gradually add coupling agent, antioxidant and dispersant in multiple batches. S3: After stirring, pour into the reaction vessel and place the reaction vessel in the insulated room, and react at 150-160℃ for 4-6 hours; S4: After the reaction, pour the mixture into a mixer, control the temperature between 110-130℃, control the stirring time between 15-20min, then pour it into a mold, control the molding time between 5-10min, and finally cool and remove the material to obtain ultra-high molecular weight polyethylene flame retardant composite material.

[0008] Preferably, the grinding and crushing machine in S1 includes an upper tank and a lower tank, which are connected. A feeding port is provided on one side of the upper end of the upper tank, and a grinding and crushing mechanism is provided inside the upper tank. An electric furnace is provided inside the lower tank. The grinding and crushing mechanism includes a rotating shaft, a roller, and a pressing plate. The lower end of the rotating shaft extends into the upper tank, and a roller is fixedly connected to the outer ring of the rotating shaft. Below the roller is a pressing plate with holes, and the edge of the pressing plate is fixed to the inner wall of the upper tank. A collecting hopper is provided above the electric furnace, and the collecting hopper is funnel-shaped. The upper end of the rotating shaft is connected to the output end of a motor. By forming blocks... Coke is fed into the upper tank through the feeding port. The coke falls onto the rolling plate, and the rotating shaft drives the rolling roller to rotate. The rolling roller crushes the coke into fine particles. Thanks to the rapid heating of the coke and its simultaneous heating with calcium phosphate and silicon dioxide in the electric furnace, the amount of unreacted coke is reduced, making the white phosphorus produced by the reaction purer. At the same time, after the coke is crushed, it is easier to mix with calcium phosphate and silicon dioxide in the electric furnace, which also improves the quality of the white phosphorus produced by heating and can also accelerate the production efficiency of white phosphorus, thereby improving the preparation efficiency of ultra-high molecular weight polyethylene flame retardant composite materials.

[0009] Preferably, the crushing roller includes a rotating roller, a crushing body, a gear, and a rack; the rack is ring-shaped and fixed to the inner wall of the upper tank. The rack meshes with the gear, which is fixed to one end of the rotating roller. The crushing body is fixed to the rotating roller, and the other end of the rotating roller is rotatably connected to a rotating shaft. The rotating shaft drives the rotating roller to rotate, and the engagement of the rack and gear causes the rotating roller to rotate on its own axis, which in turn drives the crushing body to rotate. This achieves the crushing body revolving around the rotating shaft and rotating on its own axis around the rotating roller. During the revolution, the coke is crushed and crushed, and during the rotation, the coke is crushed by kneading and squeezing, improving the crushing effect of the coke. This allows the coke to better react with calcium phosphate and silicon dioxide during heating, improving the heating reaction efficiency and thus improving the preparation efficiency of ultra-high molecular weight polyethylene flame-retardant composite materials.

[0010] Preferably, the compaction body is spherical, with multiple concentric compaction strips on its surface. The edges of the compaction strips are blade-shaped, and the compaction plate is concave, with its shape matching that of the compaction body. The spherical shape of the compaction body and the matching shape of the compaction plate ensure that the coke falling onto the compaction plate is concentrated in the concave area, which helps the compaction body to better and more effectively contact the coke and crush it. At the same time, the compaction strips on the surface of the compaction body cut and crush the coke, improving the crushing effect of the compaction body on the coke.

[0011] Preferably, the lower end of the rotating shaft is provided with a screening mechanism; the screening mechanism includes a screen plate, a spring, and a limiting block; the lower end of the rotating shaft passes through the screen plate and is fixedly connected to the limiting block, the limiting block is provided with a protrusion, the protrusion rests on the lower surface of the screen plate, the screen plate is inclined, the lower part of the screen plate passes through the lower tank and extends outside the lower tank, the lower surfaces of both ends of the screen plate are fixedly connected to springs, the springs are fixedly connected to support blocks provided on the inner side wall of the lower tank; the rotating shaft drives the limiting block to rotate, the limiting block drives the protrusion to rotate, the protrusion intermittently lifts the screen plate, realizes stable vibration of the screen plate, and quickly filters the coke falling into the screen plate, quickly shakes the coke particles with the required diameter after crushing into the electric furnace, while the coke with the unqualified diameter is filtered and vibrates away from the lower tank along the inclined angle of the screen plate, and then fed into the feeding port for secondary grinding and crushing; controlling the diameter of the coke particles further ensures that the coke reacts with calcium phosphate and silicon dioxide in a synchronous heating process, resulting in higher quality white phosphorus.

[0012] Preferably, an air-blowing mechanism is provided below the support block; the air-blowing mechanism includes a cylinder, a push-pull rod, a pressure plate, a pipe, and air nozzles; one end of the push-pull rod slides through the support block and the spring, and is fixed to the screen plate; the other end of the push-pull rod passes through the cylinder and is fixed to the pressure plate; the pressure plate is slidably connected to the cylinder; a pipe is fixed to one side of the cylinder; the pipe is placed below the screen plate, and multiple air nozzles are provided on the pipe; the screen plate swings up and down, and the screen plate drives the pressure plate to move in the cylinder through the push-pull rod, forcing the air in the cylinder into the pipe and spraying it out from the air nozzles, impacting the dry mesh of the screen plate, causing the coke fragments in the mesh to be arranged in a flake-like shape, and then falling back onto the screen plate, where they are broken by other coke particles, preventing the flake-like coke from clogging the mesh and causing the screen plate to vibrate and screen ineffectively.

[0013] Preferably, each of the jet nozzles is provided with a baffle, the edge of which is rotatably connected to the inner wall of the jet nozzle by a torsion spring, and the baffle is in clearance fit with the inner wall of the jet nozzle; by providing the baffle, when airflow is ejected from the jet nozzle, the baffle opens under the pressure of the airflow; when there is no gas, the baffle blocks the jet nozzle under the torsion of the torsion spring, preventing coke particles from falling into the jet nozzle and clogging it.

[0014] Preferably, a flow divider is provided at the lower end of the feeding port; one end of the flow divider is connected to the feeding port, the middle position of the flow divider is fitted with the rotating shaft, the flow divider is inclined downward, and multiple outlets are opened on the bottom surface of the flow divider, and the outlets are strip-shaped; by setting the flow divider, the falling coke is separated and falls evenly into the concave surface of the rolling plate, so that the rolling plate is evenly subjected to the extrusion pressure of the rolling body, preventing the rolling plate from being severely worn and broken when the coke falls into one position point, thus making it unusable.

[0015] The beneficial effects of this invention are as follows: 1. By feeding lumps of coke into the upper tank through the feeding port, the coke falls onto the rolling plate. The rotating shaft drives the rolling roller to rotate, and the rolling roller crushes the coke into fine fragments. Thanks to the rapid heating of the coke and its simultaneous heating with calcium phosphate and silicon dioxide in the electric furnace, the amount of unreacted coke is reduced, making the white phosphorus produced by the reaction purer. At the same time, after the coke is crushed, it is easier to mix with calcium phosphate and silicon dioxide in the electric furnace, which also improves the quality of the white phosphorus produced by heating and can also accelerate the production efficiency of white phosphorus, thereby improving the preparation efficiency of ultra-high molecular weight polyethylene flame retardant composite materials.

[0016] 2. The rotating shaft drives the rotating roller to rotate. At the same time, the rack and gear work together to make the rotating roller rotate on its own axis, which in turn drives the compaction body to rotate. This allows the compaction body to revolve around the rotating shaft and rotate on its own axis around the rotating roller. During the revolution, the coke is crushed and crushed, and during the rotation, the coke is crushed by kneading and squeezing. This improves the crushing effect of the coke and allows it to react better with calcium phosphate and silicon dioxide during heating, thus improving the heating reaction efficiency and improving the preparation efficiency of ultra-high molecular weight polyethylene flame retardant composite materials. Attached Figure Description

[0017] The invention will now be further described with reference to the accompanying drawings.

[0018] Figure 1 This is a flowchart of the preparation method in this invention; Figure 2 This is a perspective view of the grinding and crushing machine in this invention; Figure 3 This is a cross-sectional view of the grinding and crushing machine in this invention; Figure 4 yes Figure 3 Enlarged view of a portion of point A in the middle; Figure 5 This is a top view of the jet nozzle in this invention; Figure 6 This is a diagram showing the fit between the flow divider and the feeding port in this invention; In the diagram: 1. Grinding and crushing machine; 2. Upper tank; 3. Lower tank; 4. Feed port; 5. Electric furnace; 6. Rotating shaft; 7. Roller; 8. Roller plate; 9. Collecting hopper; 10. Rotating roller; 11. Roller body; 12. Gear; 13. Rack; 14. Roller bar; 15. Screen plate; 16. Spring; 17. Limiting block; 18. Protrusion; 19. Support block; 21. Push-pull rod; 22. Pressure plate; 23. Pipe body; 24. Air nozzle; 25. Baffle; 26. Torsion spring; 27. Diverter hood; 28. Outlet. Detailed Implementation

[0019] To make the technical means, creative features, objectives and effects of this invention easier to understand, the invention will be further described below in conjunction with specific embodiments.

[0020] Example 1: An ultra-high molecular weight polyethylene flame-retardant composite material comprises the following components in parts by weight: 50-70 parts base material; Additives 45-60 parts; The base material comprises the following components in parts by weight: 35-60 parts of polyethylene resin; 25-35 parts of red phosphorus; 20-30 parts of silicon dioxide; 10-25 parts talcum powder; The additive comprises the following components in parts by weight: 20-40 parts of coupling agent; Antioxidant 30-50 parts; 45-60 parts of dispersant.

[0021] The coupling agent is a monoalkoxy pyrophosphate type titanate coupling agent; the antioxidant is a phosphite antioxidant; and the dispersant is YY-503A plastic dispersant.

[0022] Reference Figure 1 A method for preparing ultra-high molecular weight polyethylene flame-retardant composite materials, the method being used to prepare any of the above-mentioned ultra-high molecular weight polyethylene flame-retardant composite materials, the method comprising the following steps: S1: Prepare base material red phosphorus. Use grinding and crushing mill 1 to grind and crush the coke used to prepare red phosphorus. Then, put it into electric furnace 5 with calcium phosphate and silicon dioxide. Heat it in electric furnace 5 to 1400-1500℃ to react and obtain white phosphorus. Then, heat it in the absence of air to convert it into red phosphorus for later use. S2: Add the prepared red phosphorus, polyethylene resin, silica and talc powder into a mixing tank and stir to mix. During the stirring and mixing process, gradually add coupling agent, antioxidant and dispersant in multiple batches. S3: After stirring, pour into the reaction vessel and place the reaction vessel in the insulated room, and react at 150-160℃ for 4-6 hours; S4: After the reaction, pour the mixture into a mixer, control the temperature between 110-130℃, control the stirring time between 15-20min, then pour it into a mold, control the molding time between 5-10min, and finally cool and remove the material to obtain ultra-high molecular weight polyethylene flame retardant composite material.

[0023] Reference Figure 2 and Figure 3The grinding and crushing machine 1 described in S1 includes an upper tank 2 and a lower tank 3, which are connected. A feeding port 4 is provided on one side of the upper end of the upper tank 2, and a grinding and crushing mechanism is installed inside the upper tank 2. An electric furnace 5 is installed inside the lower tank 3. The grinding and crushing mechanism includes a rotating shaft 6, a rolling roller 7, and a rolling plate 8. The lower end of the rotating shaft 6 extends into the upper tank 2, and the rolling roller 7 is fixedly connected to the outer ring of the rotating shaft 6. Below the rolling roller 7 is a rolling plate 8 with holes, and the edge of the rolling plate 8 is fixedly connected to the inner wall of the upper tank 2. A collecting hopper 9 is provided above the electric furnace 5, and the collecting hopper 9 is funnel-shaped. The upper end of the rotating shaft 6 is connected to the output of a motor. The process involves feeding lumps of coke into the upper tank 2 through the feeding port 4. The coke falls onto the rolling plate 8, and the rotating shaft 6 drives the rolling roller 7 to rotate. The rolling roller 7 crushes the coke into fine particles. Thanks to the rapid heating of the coke and its simultaneous heating with the calcium phosphate and silicon dioxide in the electric furnace 5, the amount of unreacted coke is reduced, resulting in purer white phosphorus produced by the reaction. At the same time, after the coke is crushed, it is easier to mix with calcium phosphate and silicon dioxide in the electric furnace 5, which also improves the quality of the white phosphorus generated by heating and accelerates the production efficiency of white phosphorus, thereby improving the preparation efficiency of ultra-high molecular weight polyethylene flame retardant composite materials.

[0024] Reference Figure 3 The crushing roller 7 includes a rotating roller 10, a crushing body 11, a gear 12, and a rack 13. The rack 13 is ring-shaped and fixed to the inner wall of the upper tank 2. The rack 13 meshes with the gear 12, which is fixed to one end of the rotating roller 10. The crushing body 11 is fixed to the rotating roller 10, and the other end of the rotating roller 10 is rotatably connected to the rotating shaft 6. The rotating shaft 6 drives the rotating roller 10 to rotate. At the same time, the cooperation between the rack 13 and the gear 12 causes the rotating roller 10 to rotate on its own axis, which in turn drives the crushing body 11 to rotate. This allows the crushing body 11 to revolve around the rotating shaft 6 and rotate on its own axis around the rotating roller 10. During the revolve, the coke is crushed and crushed. During the rotation, the coke is crushed and crushed by squeezing. This improves the crushing effect of the coke and allows the coke to react better with calcium phosphate and silicon dioxide during heating, thereby improving the heating reaction efficiency and thus improving the preparation efficiency of ultra-high molecular weight polyethylene flame retardant composite materials.

[0025] Reference Figure 3 The compaction body 11 is spherical in shape, and its surface is provided with multiple concentric compaction strips 14. The edges of the compaction strips 14 are blade-shaped. The compaction plate 8 is concave, and its shape is adapted to the shape of the compaction body 11. The spherical shape of the compaction body 11 and the adaptation of the shape of the compaction plate 8 to the shape of the compaction body 11 allow the coke falling onto the compaction plate 8 to concentrate in the concave position of the compaction plate 8. This facilitates better and more effective contact between the compaction body 11 and the coke, and the crushing of the coke. At the same time, the compaction strips 14 on the surface of the compaction body 11 cut and crush the coke, improving the crushing effect of the compaction body 11 on the coke.

[0026] Reference Figure 3 and Figure 4The lower end of the rotating shaft 6 is provided with a screening mechanism; the screening mechanism includes a sieve plate 15, a spring 16, and a limiting block 17; the lower end of the rotating shaft 6 passes through the sieve plate 15 and is fixedly connected to the limiting block 17, the limiting block 17 is provided with a protrusion 18, the protrusion 18 abuts against the lower plate surface of the sieve plate 15, the sieve plate 15 is inclined, the lower part of the sieve plate 15 passes through the lower tank 3 and extends outside the lower tank 3, the lower surfaces of both ends of the sieve plate 15 are fixedly connected to the spring 16, the spring 16 is fixedly connected to the support block 19 provided on the inner side wall of the lower tank 3; the rotating shaft 6 drives the limiting block 17 to rotate, the limiting block 17 drives the protrusion 18 to rotate, and the protrusion 18 intermittently lifts the screen plate 15, achieving stable vibration of the screen plate 15 and quickly filtering the coke falling into the screen plate 15. The coke particles with the required diameter after crushing are quickly shaken into the electric furnace 5, while the coke with the unqualified diameter is filtered and vibrated away from the lower tank 3 along the inclined angle of the screen plate 15, and then fed into the feeding port 4 for secondary grinding and crushing. By controlling the diameter of the coke particles, it is further ensured that the coke reacts synchronously with calcium phosphate and silicon dioxide, resulting in higher quality white phosphorus.

[0027] Reference Figure 3 and Figure 4 An air-blowing mechanism is provided below the support block 19; the air-blowing mechanism includes a cylinder, a push-pull rod 21, a pressure plate 22, a pipe 23, and an air nozzle 24; one end of the push-pull rod 21 slides through the support block 19 and the spring 16, and is fixed to the screen plate 15; the other end of the push-pull rod 21 passes through the cylinder and is fixed to the pressure plate 22. The pressure plate 22 is slidably and sealingly connected to the cylinder. The pipe 23 is fixed to one side of the cylinder, and the pipe 23 is placed below the screen plate 15. Multiple air jet nozzles 24 are installed on the screen plate 15; the screen plate 15 swings up and down, and the screen plate 15 drives the pressure plate 22 to move in the cylinder through the push-pull rod 21, and forces the air in the cylinder into the pipe 23 and sprays it out from the air jet nozzles 24, impacting the dry mesh of the screen plate 15, and causing the coke fragments in the mesh to be arranged in the mesh and fall back onto the screen plate 15, where they are broken by other coke particles, preventing the coke in the form of flakes from clogging the mesh and causing the screen plate 15 to vibrate and screen ineffectively.

[0028] Reference Figure 5 Each of the jet nozzles 24 is provided with a baffle 25. The edge of the baffle 25 is rotatably connected to the inner wall of the jet nozzle 24 by a torsion spring 26, and the baffle 25 is in clearance fit with the inner wall of the jet nozzle 24. By providing the baffle 25, when airflow is ejected from the jet nozzle 24, the baffle 25 opens under the pressure of the airflow. When there is no gas, the baffle 25 blocks the jet nozzle 24 under the torsion of the torsion spring 26, preventing coke particles from falling into the jet nozzle 24 and clogging it.

[0029] Example 2: Reference Figure 6Compared with Embodiment 1, as another embodiment of the present invention, the lower end of the feeding port 4 is provided with a diversion hood 27; one end of the diversion hood 27 is connected to the feeding port 4, the middle position of the diversion hood 27 is fitted with the rotating shaft 6 with a gap, the diversion hood 27 is inclined downward, and the bottom surface of the diversion hood 27 has multiple outlets 28, and the outlets 28 are strip-shaped; by setting the diversion hood 27, the falling coke is separated and falls evenly into the concave surface of the rolling plate 8, so that the rolling plate 8 is evenly subjected to the extrusion pressure of the rolling body 11, preventing the rolling plate 8 from being severely worn and broken when the coke falls into one position point, and thus becoming unusable.

[0030] Working principle: The upper end of the rotating shaft 6 is connected to the output end of the motor; by feeding the lumpy coke into the upper tank 2 through the feeding port 4, the coke falls onto the rolling plate 8, and the rotating shaft 6 drives the rolling roller 7 to rotate. The rolling roller 7 crushes the coke into fine particles. Thanks to the rapid heating of the coke and the synchronous heating with the calcium phosphate and silicon dioxide in the electric furnace 5, the amount of unreacted coke is reduced, making the white phosphorus produced by the reaction purer. At the same time, after the coke is crushed, it is easier to mix with calcium phosphate and silicon dioxide in the electric furnace 5, which also improves the quality of the white phosphorus generated by heating and can also speed up the production efficiency of white phosphorus, thereby improving the preparation efficiency of ultra-high molecular weight polyethylene flame retardant composite materials. The rotating shaft 6 drives the rotating roller 10 to rotate. At the same time, the rack 13 and the gear 12 cooperate to make the rotating roller 10 rotate on its own axis, which in turn drives the rolling body 11 to rotate. This allows the rolling body 11 to revolve around the rotating shaft 6 and rotate on its own axis around the rotating roller 10. During the revolution, the coke is crushed and crushed. During the rotation, the coke is crushed and crushed by squeezing. This improves the crushing effect of the coke and allows the coke to react better with calcium phosphate and silicon dioxide during heating, thereby improving the heating reaction efficiency and thus improving the preparation efficiency of ultra-high molecular weight polyethylene flame retardant composite materials. The crushing body 11 is spherical, and the shape of the crushing plate 8 is adapted to the shape of the crushing body 11 so that the coke falling onto the crushing plate 8 is concentrated in the concave position of the crushing plate 8. This is beneficial for the crushing body 11 to better and more effectively contact the coke and crush it. At the same time, the crushing strips 14 on the surface of the crushing body 11 cut and crush the coke, improving the crushing effect of the crushing body 11 on the coke. The rotating shaft 6 drives the limiting block 17 to rotate, and the limiting block 17 drives the protrusion 18 to rotate. The protrusion 18 intermittently lifts the screen plate 15, achieving stable vibration of the screen plate 15 and rapidly filtering the coke falling into the screen plate 15. Coke particles with the required diameter after crushing are quickly shaken into the electric furnace 5, while coke with an unqualified diameter is filtered and vibrated along the inclined angle of the screen plate 15 to leave the lower tank 3, and then fed into the feeding port 4 for secondary grinding and crushing. By controlling the diameter of the coke particles, it is further ensured that the coke reacts synchronously with calcium phosphate and silicon dioxide, resulting in higher quality white phosphorus. The screen plate 15 swings up and down. The screen plate 15 drives the pressure plate 22 to move in the cylinder through the push-pull rod 21, and forces the air in the cylinder into the pipe 23 and sprays it out from the jet nozzle 24. The air impacts the dry mesh of the screen plate 15, causing the coke fragments in the mesh to be arranged in the mesh and fall back onto the screen plate 15. They are then broken by other coke particles, preventing the coke in the form of flakes from clogging the mesh and causing the screen plate 15 to vibrate and screen ineffectively. By setting baffle 25, when airflow is ejected from the nozzle 24, baffle 25 opens under the pressure of the airflow. When there is no gas, baffle 25 blocks the nozzle 24 under the torsion of torsion spring 26 to prevent coke particles from falling into the nozzle 24 and clogging it. By setting up the flow divider 27, the falling coke is separated and falls evenly onto the concave surface of the rolling plate 8, so that the rolling plate 8 is evenly subjected to the extrusion pressure of the rolling body 11, preventing the rolling plate 8 from being severely worn and broken when the coke falls into one position point, thus making it unusable.

[0031] The terms "front," "back," "left," "right," "top," and "bottom" all refer to the figures in the accompanying drawings. Figure 1 Based on the perspective of the observer, the side of the device facing the observer is defined as the front, the left side of the observer is defined as the left, and so on.

[0032] In the description of this invention, it should be understood that the terms "center", "longitudinal", "lateral", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limiting the scope of protection of this invention.

[0033] The foregoing has shown and described the basic principles, main features, and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited to the above embodiments. The embodiments and descriptions in the specification are merely illustrative of the principles of the invention. Various changes and modifications can be made to the invention without departing from its spirit and scope, and all such changes and modifications fall within the scope of the present invention as claimed. The scope of protection of the present invention is defined by the appended claims and their equivalents.

Claims

1. A method for preparing ultra-high molecular weight polyethylene flame-retardant composite material, characterized in that: It comprises the following components in parts by weight: 50-70 parts base material; Additives 45-60 parts; The base material comprises the following components in parts by weight: 35-60 parts of polyethylene resin; 25-35 parts of red phosphorus; 20-30 parts of silicon dioxide; 10-25 parts talcum powder; The additive comprises the following components in parts by weight: 20-40 parts of coupling agent; Antioxidant 30-50 parts; 45-60 parts of dispersant; The coupling agent is a monoalkoxy pyrophosphate type titanate coupling agent; the antioxidant is a phosphite antioxidant; the dispersant is YY-503A plastic dispersant; The preparation method of the flame-retardant composite material includes the following steps: S1: Prepare base material red phosphorus. Use a grinding and crushing machine (1) to grind and crush the raw material coke for preparing red phosphorus. Then, put it into an electric furnace (5) with calcium phosphate and silicon dioxide. Heat it in the electric furnace (5) to 1400-1500℃ to react and obtain white phosphorus. Then, heat it in the absence of air to convert it into red phosphorus for later use. S2: Add the prepared red phosphorus, polyethylene resin, silica and talc powder into a mixing tank and stir to mix. During the stirring and mixing process, gradually add coupling agent, antioxidant and dispersant in multiple batches. S3: After stirring, pour into the reaction vessel and place the reaction vessel in the insulated room, and react at 150-160℃ for 4-6 hours; S4: After the reaction, pour the mixture into a mixer, control the temperature between 110-130℃, control the stirring time between 15-20min, then pour it into a mold, control the molding time between 5-10min, and finally cool and remove the material to obtain ultra-high molecular weight polyethylene flame retardant composite material. The grinding and crushing machine (1) described in S1 includes an upper tank (2) and a lower tank (3). The upper tank (2) and the lower tank (3) are connected. A feeding port (4) is provided on one side of the upper end of the upper tank (2). A grinding and crushing mechanism is provided inside the upper tank (2). An electric furnace (5) is provided inside the lower tank (3). The grinding and crushing mechanism includes a rotating shaft (6), a rolling roller (7), and a rolling plate (8). The lower end of the rotating shaft (6) extends into the upper tank (2). The rolling roller (7) is fixedly connected to the outer ring of the rotating shaft (6). Below the rolling roller (7) is a rolling plate (8) with holes. The edge of the rolling plate (8) is fixedly connected to the inner wall of the upper tank (2). A collecting hopper (9) is provided above the electric furnace (5). The collecting hopper (9) is funnel-shaped. The rolling roller (7) includes a rotating roller (10), a rolling body (11), a gear (12), and a rack (13); the rack (13) is ring-shaped and is fixed to the inner wall of the upper tank (2). The rack (13) meshes with the gear (12), the gear (12) is fixed to one end of the rotating roller (10), the rolling body (11) is fixed to the rotating roller (10), and the other end of the rotating roller (10) is rotatably connected to the rotating shaft (6). The lower end of the rotating shaft (6) is provided with a screening mechanism; the screening mechanism includes a sieve plate (15), a spring (16) and a limiting block (17); the lower end of the rotating shaft (6) passes through the sieve plate (15) and is fixedly connected to the limiting block (17), the limiting block (17) is provided with a protrusion (18), the protrusion (18) rests on the lower plate surface of the sieve plate (15), the sieve plate (15) is inclined, the lower part of the sieve plate (15) passes through the lower tank (3) and extends to the outside of the lower tank (3), the lower surfaces of both ends of the sieve plate (15) are fixedly connected to the spring (16), the spring (16) is fixedly connected to the support block (19) provided on the inner side wall of the lower tank (3); An air-blowing mechanism is provided below the support block (19); the air-blowing mechanism includes a cylinder, a push-pull rod (21), a pressure plate (22), a pipe (23), and a jet nozzle (24); one end of the push-pull rod (21) slides through the support block (19) and the spring (16) and is fixed to the screen plate (15), and the other end of the push-pull rod (21) passes through the cylinder and is fixed to the pressure plate (22). The pressure plate (22) is sealed and slidably connected to the cylinder. The pipe (23) is fixed to one side of the cylinder. The pipe (23) is placed below the screen plate (15), and multiple jet nozzles (24) are provided on the pipe (23). Each of the jet nozzles (24) is provided with a baffle (25), the edge of which is rotatably connected to the inner wall of the jet nozzle (24) by a torsion spring (26), and the baffle (25) is in clearance fit with the inner wall of the jet nozzle (24).

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