A modified PA plastic processing and preparation method

Abstract

The invention discloses a modified PA plastic processing and preparation method, which is composed of the following components by weight: 30-40 parts of PA resin, 20-30 parts of PPO, 6-14 parts of compatibilizer, 4-8 parts of lubricant, 20-30 parts of filler, and 0.5-1.5 parts of anti-aging agent; S1: drying the PA resin, PPO, compatibilizer, lubricant, filler and anti-aging agent, and the drying temperature is 90-110° C. The modified PA plastic processing and preparation method uses a second heating roller to heat and convey one side of a second plastic plate, so that the second plastic plate forms the same staggered surface wide and bottom narrow concave-convex grooves as the first plastic plate, so that the first plastic plate and the second plastic plate are pressed and coated by a conveying roller, so that the concave-convex grooves on the first plastic plate and the second plastic plate are matched with each other, the contact surface between the two is increased, and the first plastic plate, the glass fiber and the second plastic plate are closely connected by cooling to increase the connection strength, so as to make the modified PA plastic and effectively improve its performance.

Description

Technical Field

[0001] The invention relates to the technical field of modified PA plastic processing, in particular to a modified PA plastic processing and preparation method. Background Art

[0002] PA plastic is a general term for thermoplastic resins containing repeating amide groups on the main chain of the molecule. It is tough, wear-resistant, oil-resistant, has good fluidity, is prone to shrinkage and deformation, has a certain degree of flame retardancy, and is easy to heat to make various products. It is widely used in the fields of automobile manufacturing, electrical and electronic equipment, and medical equipment. At the same time, it can be modified by adding glass fiber and other fillers to improve performance and expand the scope of application.

[0003] When using PA plastic products, in order to improve the performance of PA plastic products, it is necessary to modify the PA plastic by adding glass fiber during the PA plastic processing to increase the performance of the PA plastic. In the process of adding glass fiber, it is often mixed with resin, dispersant, stabilizer and other additives at the same time, and then extruded by twin-screw heating. The extruded mixed product is prone to glass fiber leakage, which brings certain inconvenience to the performance of plastic products and subsequent processing.

[0004] In response to existing problems, it is urgent to innovate based on the original modified PA plastic processing. Summary of the invention

[0005] The object of the present invention is to provide a modified PA plastic processing and preparation method to solve the problem proposed in the above background technology that when using PA plastic products, in order to improve the performance of PA plastic products, it is necessary to modify the PA plastic by adding glass fiber during the PA plastic processing process to increase the performance of the PA plastic. In the process of adding glass fiber, it is often mixed with resin, dispersant, stabilizer and other additives at the same time, and then heated and extruded by a twin-screw extruder. The extruded mixed product is prone to glass fiber leakage, which brings certain inconveniences to the performance of the plastic product and subsequent processing.

[0006] To achieve the above object, the present invention provides the following technical solution: a modified PA plastic, comprising the following components by weight: 30-40 parts of PA resin, 20-30 parts of PPO, 6-14 parts of compatibilizer, 4-8 parts of lubricant, 20-30 parts of filler, and 0.5-1.5 parts of anti-aging agent;

[0007] S1: Dry PA resin, PPO, compatibilizer, lubricant, filler and antioxidant at a drying temperature of 90-110°C;

[0008] S2: The PA resin, PPO and filler after the drying process are mixed together using a mixing device at a mixing rate of 900-1200 r / min;

[0009] S3: then adding the compatibilizer, lubricant and antioxidant into the mixing device for further mixing;

[0010] S4: The mixed materials are added to the extrusion equipment, and the preliminary modified PA plastic is obtained through melting, molding and cooling.

[0011] As an optional solution of the modified PA plastic of the present invention, the lubricant is at least one of ethylene bisstearamide, pentaerythritol stearate, calcium stearate and polyethylene wax.

[0012] As an optional solution of the modified PA plastic of the present invention, the compatibilizer is styrene-maleimide-maleic anhydride copolymer.

[0013] As an optional solution of the processing and preparation method of the modified PA plastic of the present invention, it includes the following steps:

[0014] Step 1: First, let the first plastic plate of the preliminarily modified PA plastic pass through between the movable roller and the transmission roller on the support seat, and let the second plastic plate of the preliminarily modified PA plastic pass through between the second heating roller and the docking roller, and use the support base to stably support the support frame and the support seat;

[0015] Step 2: The transmission roller, the pressing roller and the first heating roller are rotated by controlling the rotation of the first motor on the support frame. When the pressing roller rotates, the glass fiber and the first plastic plate are pressed and conveyed. When the first plastic plate passes through the first heating roller, the surface of the first plastic plate is heated and melted to produce an uneven gully structure, and the glass fiber is closely attached to the first plastic plate. The unloading roller is rotated synchronously to unload the glass fiber.

[0016] Step 3: Then, the second heating roller and the docking roller are rotated to transport the second plastic sheet, and one side of the second plastic sheet is heated and melted to produce an uneven groove structure;

[0017] Step 4: Finally, the second motor is used to drive the conveying roller to convey and extrude the first plastic plate and the second plastic plate, so that the molten grooves on the first plastic plate coincide with the molten grooves on the second plastic plate, thereby increasing the contact surface between the two, and the glass fiber is extruded to make the three closely contact each other. After extrusion and cooling, the three can form a modified PA plastic sheet.

[0018] As an optional scheme for the processing and preparation method of the modified PA plastic described in the present invention, movable rollers are installed at equal distances on the inner side of the supporting seat, and the outer surface of the movable rollers is in contact with the outer surface of the first plastic plate, and a transmission roller is in contact with the top of the first plastic plate.

[0019] As an optional scheme for the processing and preparation method of the modified PA plastic described in the present invention, wherein: the end of the transmission roller is fixedly connected to the first rotating wheel, and the outer surface of the first rotating wheel is fitted with the first belt, and the side of the first rotating wheel is provided with a second rotating wheel, and the side of the second rotating wheel is provided with a third rotating wheel, and the diameter of the second rotating wheel is equal to the diameter of the third rotating wheel, and the end of the third rotating wheel is fixedly connected to the pressing roller.

[0020] As an optional scheme for the processing and preparation method of the modified PA plastic described in the present invention, the outer side of the third rotating wheel is fitted with a second belt, and a fourth rotating wheel is arranged on the side of the third rotating wheel, and one end of the fourth rotating wheel is fixedly connected to a connecting gear, and a transmission gear is arranged on the top of the connecting gear.

[0021] As an optional scheme for the processing and preparation method of the modified PA plastic described in the present invention, wherein: a first heating roller is arranged at the other end of the fourth rotating wheel, and a collector ring is arranged on the outside of the first heating roller, and the side of the collector ring is electrically connected to a wire, and a heating wire is arranged at the end of the wire.

[0022] As an optional scheme for the processing and preparation method of the modified PA plastic described in the present invention, wherein: a first cavity is opened inside the first heating roller, and a connecting ring seat is fixedly connected to the outer wall of the first heating roller, and the connecting ring seats on the first heating roller are arranged at equal distances, and a connecting groove is opened on the surface of the connecting ring seat, a second cavity is opened inside the connecting ring seat, and an insulating layer is provided on the inner wall of the connecting ring seat.

[0023] As an optional scheme for the processing and preparation method of the modified PA plastic described in the present invention, wherein: the diameter of the transmission gear is the same as the diameter of the connecting gear, and the end of the transmission gear is fixedly connected to a second heating roller, and the outer wall of the second heating roller is fixedly connected to a docking ring seat, and the docking ring seats are arranged at equal distances.

[0024] Compared with the prior art, the present invention has the following beneficial effects:

[0025] 1. The modified PA plastic processing and preparation method is provided with a pressing roller, which utilizes the rotation of a driving roller to convey the first plastic plate, and when the driving roller rotates, it will simultaneously drive the pressing roller to rotate, and the pressing roller presses the glass fiber and the first plastic plate to realize the simultaneous pressing and conveying of the first plastic plate and the glass fiber yarn, so that the glass fiber is evenly and tightly attached to the first plastic plate, effectively avoiding the situation where the glass fiber yarn is exposed.

[0026] 2. The modified PA plastic processing and preparation method is provided with a first heating roller, and a plurality of connecting ring seats are provided on the first heating roller, and a connecting groove is provided on the connecting ring seat, so that the glass fiber is embedded in the connecting groove to limit the glass fiber. When the first heating roller rotates, the first plastic plate and the glass fiber are pressed at the same time, and the first heating roller is used to heat both of them, so that one side of the first plastic plate forms a molten state, so that the glass fiber is closely connected to the first plastic plate, and the setting of the plurality of connecting ring seats is used to form concave-convex grooves on the first plastic plate.

[0027] 3. The modified PA plastic processing and preparation method is provided with a heat-insulating layer, and utilizes the heating wire inside the connecting ring seat, the heating wire is connected to the collector ring through a wire, and the external circuit is contacted and connected to the collector ring, so that when the first heating roller rotates, the heating wire in the connecting ring seat is still in an energized heating state, and the heat-insulating layer provided at the bottom of the heating wire is used to separate the first cavity and the second cavity, so that the temperature in the first cavity is slightly lower than the temperature in the second cavity, and then when in contact with the first plastic plate, the second cavity with higher heat will contact the depth of the first plastic plate, and the first cavity will contact the surface of the first plastic plate, so that the melting state in the depth of the first plastic plate is greater than the melting state on the surface, thereby forming a concave-convex groove with a wide surface and a narrow bottom.

[0028] 4. The modified PA plastic processing and preparation method is provided with a second heating roller. When the first heating roller rotates, it drives the connecting gear to rotate. The connecting gear is connected to the transmission gear, so that the first heating roller and the second heating roller rotate at the same time. The second heating roller is provided with docking ring seats at equal distances. The internal structure of the docking ring seats is the same as that of the connecting ring seats, and the docking ring seats and the connecting ring seats are staggered. The second heating roller is used to heat and convey one side of the second plastic plate, so that the second plastic plate forms the same staggered surface wide and narrow bottom concave-convex grooves as the first plastic plate, so that the first plastic plate and the second plastic plate are pressed and covered by the conveying roller later, so that the concave-convex grooves on the first plastic plate and the second plastic plate are matched with each other, thereby increasing the contact surface between the two, and the first plastic plate, the glass fiber and the second plastic plate are closely connected by cooling to increase the connection strength, so as to make the modified PA plastic and effectively improve its performance. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] Figure 1 It is a schematic diagram of the processing flow of the present invention;

[0030] Figure 2 It is a front view structural schematic diagram of the present invention;

[0031] Figure 3 It is a schematic diagram of the connection structure between the support frame and the second rotating wheel of the present invention;

[0032] Figure 4 It is a schematic diagram of the connection structure between the first plastic plate and the second plastic plate of the present invention;

[0033] Figure 5 It is a schematic diagram of the connection structure between the first heating roller and the second heating roller of the present invention;

[0034] Figure 6 It is a schematic diagram of a partial cross-sectional structure of the first heating roller of the present invention;

[0035] Figure 7 For the present invention Figure 6 The enlarged structural diagram at A in the middle;

[0036] Figure 8 It is a schematic diagram of the cross-sectional structure of the first plastic plate and the second plastic plate adhered to each other in the present invention.

[0037] In the figure: 1. support base; 2. support frame; 3. support seat; 4. movable roller; 5. first plastic plate; 6. transmission roller; 7. first rotating wheel; 8. first motor; 9. first belt; 10. second rotating wheel; 11. third rotating wheel; 12. pressing roller; 13. glass fiber; 14. unloading roller; 15. second belt; 16. fourth rotating wheel; 17. connecting gear; 18. first heating roller; 19. collector ring; 20. conductor; 21. heating wire; 22. first cavity; 23. connecting ring seat; 24. connecting groove; 25. second cavity; 26. heat insulation layer; 27. transmission gear; 28. second heating roller; 29. ​​docking ring seat; 30. second plastic plate; 31. docking roller; 32. conveying roller; 33. second motor. DETAILED DESCRIPTION

[0038] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0039] Embodiment 1, the present invention provides a technical solution: a modified PA plastic, composed of the following components by weight: 30-40 parts of PA resin, 20-30 parts of PPO, 6-14 parts of compatibilizer, 4-8 parts of lubricant, 20-30 parts of filler, 0.5-1.5 parts of anti-aging agent;

[0040] S1: Dry PA resin, PPO, compatibilizer, lubricant, filler and antioxidant at a drying temperature of 90-110°C;

[0041] S2: The PA resin, PPO and filler after the drying process are mixed together using a mixing device at a mixing rate of 900-1200 r / min;

[0042] S3: then adding the compatibilizer, lubricant and antioxidant into the mixing device for further mixing;

[0043] S4: adding the mixed material into an extruder, and obtaining a preliminary modified PA plastic by melting, molding and cooling;

[0044] The lubricant is at least one of ethylene bisstearamide, pentaerythritol stearate, calcium stearate, and polyethylene wax, and the compatibilizer is styrene-maleimide-maleic anhydride copolymer;

[0045] By adding PPO and anti-aging agents to PA resin, PA plastics are initially modified to improve the rigidity and flame retardancy of PA plastics. At the same time, the anti-aging agents added to PA plastics are used to improve their anti-aging properties and service life, thereby increasing the scope of use of PA plastics.

[0046] Example 2: This example is an improvement made on the basis of Example 1. For details, please refer to Figure 1 and Figure 4 , including the following steps:

[0047] Step 1: First, let the first plastic plate 5 of the preliminarily modified PA plastic pass through between the movable roller 4 and the driving roller 6 on the supporting seat 3, and let the second plastic plate 30 of the preliminarily modified PA plastic pass through between the second heating roller 28 and the docking roller 31, and use the supporting base 1 to stably support the supporting frame 2 and the supporting seat 3;

[0048] Step 2: The driving roller 6, the pressing roller 12 and the first heating roller 18 are rotated by controlling the first motor 8 on the support frame 2 to rotate. When the pressing roller 12 rotates, the glass fiber 13 and the first plastic plate 5 are pressed and conveyed. When the first plastic plate 5 passes through the first heating roller 18, the surface of the first plastic plate 5 is heated and melted to produce an uneven gully structure, and the glass fiber 13 is closely attached to the first plastic plate 5. The discharge roller 14 is rotated synchronously to discharge the glass fiber 13.

[0049] Step 3: Then, the second heating roller 28 and the docking roller 31 are rotated to transport the second plastic plate 30, and at the same time, one side of the second plastic plate 30 is heated and melted to produce an uneven groove-like structure;

[0050] Step 4: Finally, the second motor 33 is used to drive the conveying roller 32 to rotate to convey and extrude the first plastic plate 5 and the second plastic plate 30, so that the molten grooves on the first plastic plate 5 coincide with the molten grooves on the second plastic plate 30, thereby increasing the contact surface between the two, and the glass fiber 13 is extruded to make the three closely contact each other. After extrusion and cooling, the three can form a modified PA plastic sheet.

[0051] Example 3: This example is intended to promote the solution of the problem of how to evenly distribute the glass fibers 13 to avoid leakage. This example is an improvement made on the basis of Example 2. For details, please refer to Figure 1 and Figure 4 , movable rollers 4 are installed at equal distances on the inner side of the supporting seat 3, and the outer surface of the movable rollers 4 is in contact with the outer surface of the first plastic plate 5, and the top of the first plastic plate 5 is in contact with a transmission roller 6, the end of the transmission roller 6 is fixedly connected with a first rotating wheel 7, and the outer surface of the first rotating wheel 7 is in contact with a first belt 9, and a second rotating wheel 10 is arranged on the side of the first rotating wheel 7, and a third rotating wheel 11 is arranged on the side of the second rotating wheel 10, and the diameter of the second rotating wheel 10 is equal to the diameter of the third rotating wheel 11, and a pressing roller 12 is fixedly connected to the end of the third rotating wheel 11;

[0052] First, the first plastic plate 5 after preliminary modification is placed on the movable roller 4 on the supporting seat 3. A plurality of movable rollers 4 are arranged at equal distances to make the first plastic plate 5 smoother during transportation and reduce the friction of the first plastic plate 5 during transportation. The first motor 8 on the supporting frame 2 is controlled to rotate. The first motor 8 drives the first rotating wheel 7 and the transmission roller 6 to be connected. The transmission roller 6 is connected to the first plastic plate 5. The rotation of the transmission roller 6 is used to drive the first plastic plate 5 to move. The first rotating wheel 7 is connected to the second rotating wheel 10 through the first belt 9, thereby driving the second rotating wheel 10, the third rotating wheel 11 and the pressing roller 12 to rotate. The shape of the pressing roller 12 is the same as that of the first heating roller 18. The rotation of the first heating roller 18 is used to press and convey the glass fiber 13 and the first plastic plate 5, and the glass fiber 13 and the first plastic plate 5 are attached to each other, so that the distribution of the glass fiber 13 is more uniform, and the naked glass fiber 13 is effectively avoided.

[0053] Embodiment 4: This embodiment is intended to promote the solution of the problem of how to ensure that the heating wire 21 is in a heating state while rotating. This embodiment is an improvement made on the basis of Embodiment 2. For details, please refer to Figure 1 and Figure 4 The outer side of the third rotating wheel 11 is closely connected with the second belt 15, and the side of the third rotating wheel 11 is provided with a fourth rotating wheel 16, and one end of the fourth rotating wheel 16 is fixedly connected with a connecting gear 17, and a transmission gear 27 is provided on the top of the connecting gear 17, and the other end of the fourth rotating wheel 16 is provided with a first heating roller 18, and the outside of the first heating roller 18 is provided with a collector ring 19, and the side of the collector ring 19 is electrically connected with a wire 20, and the end of the wire 20 is provided with a heating wire 21;

[0054] When the pressing roller 12 rotates, it will drive the second belt 15 and the fourth rotating wheel 16 to rotate at the same time. When the fourth rotating wheel 16 rotates, it will drive the first heating roller 18 to rotate at the same time. The first heating roller 18 presses the glass fiber 13 and the first plastic plate 5, and uses the connecting ring seat 23 provided on the first heating roller 18. The connecting ring seat 23 is provided with a heating wire 21 to heat the first plastic plate 5 so that one side of the first plastic plate 5 is in a molten state, which is convenient for the glass fiber 13 to be closely connected with the first plastic plate 5. There are multiple heating wires 21, which are connected to the collector ring 19 through the wire 20. The collector ring 19 is arranged in two semicircles, and the external circuit is in contact with the surface of the collector ring 19. When the first heating roller 18 rotates, the collector ring 19 will rotate at the same time. When the first heating roller 18 rotates, it is ensured that the heating wire 21 is in an energized and heated state.

[0055] Example 5: This example is intended to promote the solution of the problem of how to improve the strength of plastics. This example is an improvement made on the basis of Example 1. For details, please refer to Figure 1 and Figure 4 , a first cavity 22 is provided inside the first heating roller 18, and a connecting ring seat 23 is fixedly connected to the outer wall of the first heating roller 18, and the connecting ring seats 23 on the first heating roller 18 are arranged at equal distances, and a connecting groove 24 is provided on the surface of the connecting ring seat 23, a second cavity 25 is provided inside the connecting ring seat 23, and a heat insulating layer 26 is provided on the inner wall of the connecting ring seat 23, the diameter of the transmission gear 27 is the same as the diameter of the connecting gear 17, and the end of the transmission gear 27 is fixedly connected to the second heating roller 28, and a docking ring seat 29 is fixedly connected to the outer wall of the second heating roller 28, and the docking ring seats 29 are arranged at equal distances;

[0056] The connecting ring seat 23 is arranged at equal distances on the surface of the first heating roller 18, and the connecting ring seat 23 is provided with a connecting groove 24. The connecting groove 24 is used to press and limit the glass fiber 13, and when the connecting ring seat 23 on the first heating roller 18 is heated and rolled, a molten groove is left on the first plastic plate 5, and the heat insulation layer 26 arranged inside the connecting ring seat 23 is used to separate the first cavity 22 and the second cavity 25, so that when the heating wire 21 in the connecting ring seat 23 is heated, the temperature in the second cavity 25 is higher than the temperature in the first cavity 22, so that the connecting ring seat The top temperature of 23 is higher than the bottom temperature. When the connecting ring seat 23 contacts the first plastic plate 5, the connecting ring seat 23 contacts the first plastic plate 5 first and melts it, forming a concave-convex groove on the first plastic plate 5, and the first heating roller 18 contacts the surface of the first plastic plate 5 to further heat and melt the surface of the first plastic plate 5. Since the top temperature of the connecting ring seat 23 is higher than the bottom temperature, the heated and melted state of the inside of the first plastic plate 5 is higher than the heated and melted state of the surface of the first plastic plate 5, so that the concave-convex groove (wide on the surface and narrow on the inside) formed on the first plastic plate 5 Figure 8 (a in the middle);

[0057] When the first heating roller 18 rotates, it will drive the connecting gear 17 to rotate at the same time. The connecting gear 17 and the transmission gear 27 are meshed and connected, and the two have the same diameter. When the first heating roller 18 rotates, it will drive the second heating roller 28 to rotate at the same time, so that the second heating roller 28 cooperates with the docking roller 31 to transport the second plastic plate 30, and docking ring seats 29 are arranged at equal distances on the second heating roller 28. The internal structure of the docking ring seat 29 is the same as that of the connecting ring seat 23, and the docking ring seat 29 is staggered with the connecting ring seat 23. The second heating roller 28 and the docking ring seat 29 are used to transport and heat the second plastic plate 30, and a concave-convex groove with a wide surface and a narrow inner side is formed on the second plastic plate 30 ( Figure 8 It should be noted that the a and b numbers in the figure have no special meanings and are only for ease of understanding;

[0058] And by controlling the second motor 33 on the support frame 2 to drive the conveying roller 32 to rotate, the first plastic plate 5, the glass fiber 13 and the second plastic plate 30 are conveyed and pressed, so that the concave-convex grooves on the first plastic plate 5 and the concave-convex grooves on the second plastic plate 30 are matched with each other to increase the contact surface between the two, so that the first plastic plate 5, the glass fiber 13 and the second plastic plate 30 are closely connected to improve the connection strength, so as to make modified PA plastic and effectively improve its performance.

[0059] It should be noted that, in this article, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device.

[0060] The contents not described in detail in this specification belong to the prior art known to professional and technical personnel in this field.

[0061] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A method for preparing modified PA plastics, characterized in that: in, A modified PA plastic, comprising the following components by weight: 30-40 parts of PA resin, 20-30 parts of PPO, 6-14 parts of compatibilizer, 4-8 parts of lubricant, 20-30 parts of filler, and 0.5-1.5 parts of anti-aging agent; S1: Dry PA resin, PPO, compatibilizer, lubricant, filler and antioxidant at a drying temperature of 90-110°C; S2: The dried PA resin, PPO and filler are mixed together using a mixing device at a mixing rate of 900-1200 r / min; S3: then adding the compatibilizer, lubricant and antioxidant into the mixing equipment for further mixing; S4: adding the mixed material into an extruder, and obtaining a preliminary modified PA plastic through melting, molding and cooling; The processing and preparation method of modified PA plastic includes the following steps: Step 1: First, let the first plastic plate of the preliminarily modified PA plastic pass through between the movable roller and the transmission roller on the support seat, and let the second plastic plate of the preliminarily modified PA plastic pass through between the second heating roller and the docking roller, and use the support base to stably support the support frame and the support seat; Step 2: The transmission roller, the pressing roller and the first heating roller are rotated by controlling the rotation of the first motor on the support frame. When the pressing roller rotates, the glass fiber and the first plastic plate are pressed and conveyed. When the first plastic plate passes through the first heating roller, the surface of the first plastic plate is heated and melted to produce an uneven gully structure, and the glass fiber is closely attached to the first plastic plate. The unloading roller is rotated synchronously to unload the glass fiber. Step 3: Then, the second heating roller and the docking roller are rotated to transport the second plastic sheet, and one side of the second plastic sheet is heated and melted to produce an uneven groove structure; Step 4: Finally, the second motor is used to drive the conveying roller to convey and extrude the first plastic plate and the second plastic plate, so that the molten grooves on the first plastic plate coincide with the molten grooves on the second plastic plate, thereby increasing the contact surface between the two, and the glass fiber is extruded to make the three closely contact each other. After extrusion and cooling, the three can form a modified PA plastic plate; A collector ring is arranged outside the first heating roller, and a wire is electrically connected to the side of the collector ring, and a heating wire is arranged at the end of the wire; A first cavity is formed inside the first heating roller, and a connecting ring seat is fixedly connected to the outer wall of the first heating roller, and the connecting ring seats on the first heating roller are arranged at equal distances, and a connecting groove is formed on the surface of the connecting ring seat, a second cavity is formed inside the connecting ring seat, and a heat insulating layer is formed on the inner wall of the connecting ring seat; The outer wall of the second heating roller is fixedly connected with a docking ring seat, and the docking ring seats are arranged at equal distances; The internal structure of the docking ring seat is the same as the internal structure of the connecting ring seat, and the docking ring seat and the connecting ring seat are arranged in a staggered manner.

2. The method for preparing a modified PA plastic according to claim 1, characterized in that: The lubricant is at least one of ethylene bisstearamide, pentaerythritol stearate, calcium stearate and polyethylene wax.

3. The method for preparing a modified PA plastic according to claim 1, characterized in that: The compatibilizer is styrene-maleimide-maleic anhydride copolymer.

4. The method for preparing a modified PA plastic according to claim 1, characterized in that: Movable rollers are installed at equal distances on the inner side of the supporting seat, and the outer surface of the movable rollers is in contact with the outer surface of the first plastic plate, and a transmission roller is in contact with the top of the first plastic plate.

5. The method for preparing a modified PA plastic according to claim 4, characterized in that: The end of the transmission roller is fixedly connected to the first wheel, and the outer surface of the first wheel is fitted with the first belt, and the side of the first wheel is provided with a second wheel, and the side of the second wheel is provided with a third wheel, and the diameter of the second wheel is equal to the diameter of the third wheel, and the end of the third wheel is fixedly connected to the pressing roller.

6. The method for preparing a modified PA plastic according to claim 5, characterized in that: The outer side of the third rotating wheel is closely connected with the second belt, and the side of the third rotating wheel is provided with the fourth rotating wheel, and one end of the fourth rotating wheel is fixedly connected with a connecting gear, and the top of the connecting gear is provided with a transmission gear, the diameter of the transmission gear is the same as the diameter of the connecting gear, and the end of the transmission gear is fixedly connected with the second heating roller.

7. The method for preparing a modified PA plastic according to claim 6, characterized in that: The other end of the fourth rotating wheel is provided with a first heating roller.

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