Flexible electromagnetic shielding composite material and preparation device

Abstract

The invention relates to the technical field of electromagnetic interference, discloses a flexible electromagnetic shielding composite material and a preparation device, and solves the problems that a traditional wave-absorbing material is high in hardness, the flexibility cannot meet the use requirements of special products, materials are easy to remain in the discharging process of an internal mixer, and potential scalding risks exist in auxiliary discharging of workers. According to the flexible electromagnetic shielding composite material and the preparation device, the corresponding particle size is limited when the apparent density and the cumulative particle size distribution percentage of an absorbent reach 50%, meanwhile, a main binder and an auxiliary binder are matched for use as a binder, and a processing mode of a cross-linking process is adopted, so that the flexible electromagnetic shielding composite material is prepared. The flexibility, extension strength and temperature resistance of the wave-absorbing material are improved, during discharging, dumping is matched with vibration driven by belt transmission for auxiliary discharging, materials on the edge are pushed to the middle and are matched with rubber pads to bounce up for discharging, and the purposes of smoothly discharging, preventing material residues and protecting workers from being scalded are achieved.

Description

Technical Field

[0001] The present invention relates to the field of electromagnetic interference technology, and in particular to a flexible electromagnetic shielding composite material and a preparation device thereof. Background Art

[0002] With the development of 5G technology, electronic products are becoming more and more integrated, miniaturized, and high-frequency. While electronic products bring convenience to people's lives, they also bring electromagnetic radiation. Absorbing materials can absorb electromagnetic waves incident on their surfaces and convert them into heat or other forms of energy, which can effectively solve the problems of electromagnetic interference and electromagnetic radiation pollution. According to the production process, absorbing materials are mainly divided into dry calendering and wet coating. In the dry calendering method, the binder (rubber, thermoplastic resin, etc.) and absorbent are added to the internal mixer. Under the action of temperature and shear force, the binder will melt and evenly coat the surface of the absorbent. The mixed particles are added to the calender to extrude sheets with a certain thickness and width. The production process is free of solvent pollution and has high production efficiency. The absorbing material is attached to the surface of the terminal electronic product with double-sided tape to absorb useless electromagnetic waves. If the absorbing material cannot be tightly attached to the surface of the electronic product, the absorption effect will be greatly reduced. The better the flexibility of the absorbing material, the more likely it is to be tightly attached to the surface of the electronic product. In order to ensure the tensile strength (the calendering process will not be broken and continuous production is possible), the common calendered absorbing materials on the market have poor flexibility and cannot meet special usage requirements.

[0003] In view of the above problems, a flexible electromagnetic shielding composite material and a preparation device are proposed to solve the above problems. Summary of the invention

[0004] The purpose of the present invention is to provide a flexible electromagnetic shielding composite material and a preparation device. By using this device to work, the problems of high hardness of traditional absorbing materials and flexibility that cannot meet the use requirements of special products, easy material residue during the discharge process of the internal mixer, and potential scalding risks for workers assisting in the discharge are solved.

[0005] To achieve the above object, the present invention provides the following technical solution: a flexible electromagnetic shielding composite material, comprising 100-120 parts of an absorbent, 10-30 parts of a main binder, 0-5 parts of an auxiliary binder, 1-4 parts of a coupling agent, and 0.5-3 parts of a cross-linking agent;

[0006] The absorbent is of iron-silicon-aluminum, iron-silicon-chromium, iron-silicon and iron-nickel types. The absorbent has a scaly morphology. When the cumulative particle size distribution percentage of the absorbent reaches 50%, the corresponding particle size is 20-100 μm. The bulk density of the absorbent is 0.2-1.2 g / cm 3 .

[0007] Furthermore, the main binder is ethylene-vinyl acetate copolymer, ethylene propylene diene monomer rubber and styrene-butadiene rubber.

[0008] Furthermore, the auxiliary binder is a polymer of ethylene and butylene, or a styrene-isoprene-styrene block copolymer.

[0009] Furthermore, the coupling agent is selected from titanates and silanes. Before use, the coupling agent is first added to alcohol to be diluted into a coupling agent solution.

[0010] Furthermore, the cross-linking agent is selected from peroxides.

[0011] The present invention also provides a preparation device for the above-mentioned flexible electromagnetic shielding composite material, comprising an internal mixer body, an internal mixer box is arranged inside the internal mixer body, an outer plate is fixedly connected to the outer side of the internal mixer box, an electric heating plate is arranged inside the outer plate, a rotor is arranged inside the internal mixer box, the rotor is externally connected to a motor, an upper push bolt component is arranged on the upper surface of the internal mixer body, a side box is fixedly connected to one side of the internal mixer body, two groups of side boxes are arranged symmetrically, a discharging mechanism for auxiliary discharging is arranged between the two groups of side boxes, and a scraper component for preventing material adhesion is arranged inside the internal mixer box;

[0012] The discharging mechanism includes a motor A fixedly connected to one side of the internal mixer body, the output end of the motor A is fixedly connected to a rotating shaft, one end of the rotating shaft is fixedly connected to one side of the internal mixer box, the other side of the internal mixer box is fixedly connected to a connecting rod, one end of the connecting rod is rotatably connected to one side of the internal mixer body, a side groove is provided on one side of the internal mixer body, a rotating rod A is rotatably connected between the two groups of side boxes, the diameter of the rotating rod A is smaller than the rotating shaft, a belt A is sleeved on the outer side of the rotating shaft and the rotating rod A, a belt B is sleeved on the connecting rod and the outer side of the rotating rod A, a limiting disk group is fixedly connected to the outer side of the rotating rod A, and two groups of the limiting disk groups are provided, and the two groups of the limiting disk groups are respectively provided on both sides of the belt A and the belt B, a vibration component for vibrating the internal mixer box for discharging is fixedly connected to the outer side of the rotating rod A, a rubber pad is provided on the inner wall of the internal mixer box, and a magnetic block B is fixedly connected to the bottom surface of the rubber pad.

[0013] Furthermore, the vibration component includes a mounting roller fixedly connected to the outside of the rotating rod A, a magnetic block A is fixedly connected to the outside of the mounting roller, a rubber eccentric block is fixedly connected to the outside of the mounting roller, and the magnetic block A and the magnetic block B repel each other magnetically.

[0014] Furthermore, a pushing component is provided inside the internal mixing box to prevent smaller materials from remaining on the edge of the internal mixing box, and flip grooves are provided on both sides of the inner wall of the internal mixing box. The pushing component includes a lifting plate slidably connected to the inside of the flip groove, and the bottom surface of the lifting plate passes through one side of the internal mixing box. The lifting plate is arranged on the outer side of the internal mixing box and is fixedly connected to the bottom plate at one end, and a spring B is fixedly connected to the upper surface of the lifting plate, and one end of the spring B is fixedly connected to the inner wall of the flip groove. A rack plate is fixedly connected to the inner wall of the lifting plate, and a rotating rod B is rotatably connected to the inner wall of the flip groove. A gear is fixedly connected to the outer side of the rotating rod B, and the gear is meshed with the rack plate. A movable roller is fixedly connected to the outer side of the rotating rod B, and a push plate is fixedly connected to the outer side of the movable roller. A material blocking soft curtain is fixedly connected between the push plate and the inner wall of the flip groove.

[0015] Furthermore, the upper push bolt component includes a hydraulic rod fixedly connected to the upper surface of the internal mixer body, the output end of the hydraulic rod observes the internal mixer body and is fixedly connected to a bolt body, and a lower arc groove is opened on the bottom surface of the bolt body.

[0016] Furthermore, the scraper assembly includes a movable plate slidably connected to the inside of the mixing box, a resist plate is fixedly connected to one side of the movable plate, a spring A is fixedly connected to the bottom surface of the movable plate, the bottom end of the spring A is fixedly connected to the inner wall of the rotor, a side scraper is fixedly connected to the inner wall of the mixing box, the side scraper is fitted with the movable plate, a magnetic plate B is arranged inside the movable plate, a magnetic plate A is fixedly connected to the outside of the bolt body, and the magnetic plate A and the magnetic plate B are magnetically attracted to each other.

[0017] Compared with the prior art, the present invention has the following beneficial effects:

[0018] A flexible electromagnetic shielding composite material proposed by the present invention:

[0019] 1. The bulk density of the absorbent and the particle size corresponding to the cumulative particle size distribution percentage reaching 50% are limited. Different production processes have different choices for absorbents. For coating production processes, the bulk density of the absorbent is generally selected to be 0.2-0.5g / cm 3 The larger the particle size corresponding to the cumulative particle size distribution percentage reaching 50%, the higher the magnetic permeability of the product. However, for the calendering production process, if the particle size corresponding to the cumulative particle size distribution percentage of the absorbent reaches 50% is too large, the flaky absorbent is easy to break during the mixing and pressing process. The bulk density is too small, and the density of the absorbent produced is low, and the magnetic permeability is low. The present invention limits the bulk density of the absorbent to 0.6-1.0g / cm 3 When the cumulative particle size distribution percentage reaches 50%, the corresponding particle size is limited to 20-50um.

[0020] 2. The adhesive is a combination of a main adhesive and an auxiliary adhesive. The addition of the auxiliary adhesive improves the flexibility of the absorbing material.

[0021] 3. A cross-linking process was subsequently used, which increased the tensile strength and temperature resistance of the absorbing material while ensuring flexibility.

[0022] The present invention provides a preparation device for a flexible electromagnetic shielding composite material. Through the setting of a discharging mechanism, when the internal mixer finishes working and discharges the material, the motor A cooperates with the belt to drive the rotating rod A to rotate, and the rotation of the rubber eccentric block is utilized to knock during the discharging process to generate vibrations to the material inside thereof. At the same time, the magnetic repulsion between the magnetic block A and the magnetic block B is utilized to make the rubber pad bulge during the discharging process to assist in material discharge. During the rotation of the rubber eccentric block, the lifting plate is squeezed, and the push plate is driven to flip under the action of the rack plate and the gear, so that a small amount of small pieces of material remaining on the edge are moved closer to the middle, and are discharged flatly with the cooperation of the rubber pad to prevent residue, thereby achieving the purpose of assisting in material discharge and preventing material residue, so as to avoid workers intervening in the discharging work and being easily scalded. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 It is a schematic diagram of the overall structure of the present invention;

[0024] Figure 2 It is a schematic diagram of the structure of the discharge state of the present invention;

[0025] Figure 3 It is a schematic diagram of the structure of the upper ejector bolt component of the present invention;

[0026] Figure 4 It is a schematic diagram of the internal structure of the internal mixing box of the present invention;

[0027] Figure 5 It is a schematic diagram of the structure of the scraper assembly of the present invention;

[0028] Figure 6 It is a schematic diagram of the structure of the discharging mechanism of the present invention;

[0029] Figure 7 It is a schematic diagram of the structure of the vibration component of the present invention;

[0030] Figure 8 It is a schematic structural diagram of the pusher component of the present invention.

[0031] In the figure: 1. mixer body; 11. side box; 12. side groove; 2. mixer box; 21. outer plate; 22. rotor; 23. side scraper; 24. scraper assembly; 241. movable plate; 242. magnetic plate B; 243. stop plate; 244. spring A; 3. upper push bolt component; 31. hydraulic rod; 32. bolt body; 33. lower arc groove; 34. magnetic plate A; 4. discharge mechanism; 41. motor A; 42. rotating shaft; 43. belt A; 44. rotating shaft Rod A; 441, limit plate assembly; 45, vibration component; 451, mounting roller; 452, magnet A; 453, rubber eccentric block; 46, connecting rod; 47, belt B; 48, rubber pad; 481, magnet B; 49, material pushing component; 491, lifting plate; 492, bottom plate; 493, rotating rod B; 494, gear; 495, movable roller; 496, push plate; 497, material blocking soft curtain; 498, rack plate; 499, spring B. DETAILED DESCRIPTION

[0032] 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.

[0033] In order to further understand the content of the present invention, the present invention is described in detail in conjunction with the accompanying drawings.

[0034] Embodiment 1

[0035] A flexible electromagnetic shielding composite material, comprising 100-120 parts of an absorbent, 10-30 parts of a main binder, 0-5 parts of an auxiliary binder, 1-4 parts of a coupling agent, and 0.5-3 parts of a cross-linking agent;

[0036] The absorbent is one or more of iron-silicon-aluminum, iron-silicon-chromium, iron-silicon, iron-nickel and other alloy powders. The absorbent has a scaly morphology. When the cumulative particle size distribution percentage of the absorbent reaches 50%, the corresponding particle size is 20-100 μm, preferably 20-50 μm. The bulk density of the absorbent is 0.2-1.2 g / cm 3 , preferably 0.6-1.0g / cm 3 .

[0037] The main binder is one or more of EVA (ethylene-vinyl acetate copolymer), EPDM (ethylene propylene diene monomer rubber), and SBR (styrene-butadiene rubber).

[0038] The auxiliary binder is one or more of POE (polymer of ethylene and butylene) and SIS (styrene-isoprene-styrene block copolymer).

[0039] The coupling agent can be titanate or silane. Before use, the coupling agent is first added to alcohol to dilute it into a coupling agent solution.

[0040] The crosslinking agent is selected from peroxides, preferably DCP (diisopropylbenzene peroxide) and BIPB (bis-tert-butyl diisopropylbenzene peroxide).

[0041] The specific processing operations are as follows (including two groups of standard examples and two groups of comparative examples):

[0042] Standard Example 1

[0043] A flexible electromagnetic shielding composite material mainly comprises a flaky absorber, a main binder, an auxiliary binder, a coupling agent and a cross-linking agent, and the specific weight portions are as follows: flaky iron silicon chromium absorber: 100 portions, wherein the absorber has AD=0.6g / cm3, and a particle size distribution D50=40um, a main binder: 22 portions of EVA, an auxiliary binder: 3 portions of SIS, 3 portions of a titanate coupling agent, and 1 portion of a peroxide cross-linking agent: DCP.

[0044] The specific production steps are as follows:

[0045] Absorbent treatment: Add 3 parts of coupling agent into 200 parts of alcohol to prepare coupling agent solution. Add the coupling agent solution and absorbent into a kneader, set the temperature to 60°C, and knead for 20 minutes to allow the coupling agent to evenly coat the surface of the absorbent.

[0046] Primary mixing: weigh 3 parts of SIS and add them into a mixer, mix them with the absorbent treated with a coupling agent, the mixing temperature is 130°C, the mixing time is 20 minutes, then weigh 22 parts of EVA and add them into the mixer for 10 minutes, after the mixing is finished, lower the temperature to 80°C.

[0047] Secondary mixing: add 1 part of peroxide DCP cross-linking agent, the temperature is 80℃, and mix for 15 minutes. Crushing: The absorbing material after mixing is in the form of large blocks and needs to be broken into small particles.

[0048] Screening: Use a 20-mesh screen to screen the crushed particles. The purpose of screening is to filter out impurities and larger particles. Larger particles can be re-crushed and then screened.

[0049] Calendering: Add the crushed absorbing particles into the calender. The temperature of the calender roller is 70℃. The absorbing particles are extruded into continuous sheets under the action of temperature and extrusion. The width of the sheet is determined by the width of the baffle plate, and the thickness of the sheet is determined by the gap between the two rollers of the calender.

[0050] Cross-linking: The calendered sheet is introduced into the vulcanizer by the traction device for cross-linking. The cross-linking process will change the adhesive from a linear structure to a network structure, which can improve the strength and temperature resistance of the absorbing material. The cross-linking temperature is 120°C and the time is 5 minutes.

[0051] Laminating and slitting: Laminating double-sided tape on one or both sides according to customer's requirements, and slitting according to the specified width.

[0052] Testing: The magnetic permeability, flexibility, tensile strength, temperature resistance and surface quality of the product were tested. The specific results are shown in Table 1.

[0053] Standard Example 2

[0054] A flexible electromagnetic shielding composite material mainly comprises a flaky absorber, a main binder, an auxiliary binder, a coupling agent and a cross-linking agent, the specific weight portions are as follows: flaky iron silicon aluminum absorber: 120 portions, wherein the AD of the absorber is 1.0 g / cm3, the particle size distribution D50 is 30 um, the main binder: EVA 18 portions, the auxiliary binder: POE 4 portions, the silane coupling agent 2 portions, and the peroxide cross-linking agent BIPB 0.8 portions.

[0055] The specific production steps are as follows:

[0056] Absorbent treatment: Add 2 parts of coupling agent into 200 parts of alcohol to prepare coupling agent solution. Add the coupling agent solution and absorbent into a kneader, set the temperature to 70°C, and knead for 10 minutes to allow the coupling agent to evenly coat the surface of the absorbent.

[0057] Primary mixing: Weigh 4 parts of POE binder and add them into a mixer, mix them with the absorbent treated with coupling agent, the mixing temperature is 130°C, the mixing time is 20 minutes, then weigh 18 parts of EVA and add them into the mixer for 10 minutes, after the mixing, lower the temperature to 80°C.

[0058] Secondary mixing: add 0.8 parts of peroxide BIPB crosslinking agent, the temperature is 80°C, and mix for 15 minutes.

[0059] Crushing: The absorbing material after mixing is in the form of large blocks and needs to be broken into small particles.

[0060] Screening: Use a 20-mesh screen to screen the crushed particles. The purpose of screening is to filter out impurities and larger particles. Larger particles can be re-crushed and then screened.

[0061] Calendering: Add the crushed absorbing particles into the calender. The temperature of the calender roller is 50℃. The absorbing particles are extruded into continuous sheets under the action of temperature and extrusion. The width of the sheet is determined by the width of the baffle plate, and the thickness of the sheet is determined by the gap between the two rollers of the calender.

[0062] Cross-linking: The calendered sheet is introduced into the vulcanizer by the traction device for cross-linking. The cross-linking process will change the adhesive from a linear structure to a network structure, which can improve the strength and temperature resistance of the absorbing material. The cross-linking temperature is 150°C and the time is 2 minutes.

[0063] Laminating and slitting: Laminating double-sided tape on one or both sides according to customer's requirements, and slitting according to the specified width.

[0064] Testing: The magnetic permeability, flexibility, tensile strength, temperature resistance and surface quality of the product were tested. The specific results are shown in Table 1.

[0065] Comparative Example 1

[0066] A flexible electromagnetic shielding composite material mainly comprises a flaky absorber, a main binder, an auxiliary binder, a coupling agent and a cross-linking agent, the specific weight portions are as follows: flaky iron silicon aluminum absorber: 100 portions, wherein the AD of the absorber is 0.3 g / cm3, the particle size distribution is D50=70 um, the main binder is EVA 18 portions, the auxiliary binder is 0 portions, the silane coupling agent is 2 portions, and the peroxide BIPB cross-linking agent is 0.9 portions.

[0067] The specific production steps are as follows:

[0068] Absorbent treatment: Add 2 parts of coupling agent into 200 parts of alcohol to prepare coupling agent solution. Add the coupling agent solution and absorbent into a kneader, set the temperature to 60°C, and knead for 20 minutes to allow the coupling agent to evenly coat the surface of the absorbent.

[0069] Primary internal mixing: Weigh 18 parts of EVA binder and add it into the internal mixer, mix it with the absorbent treated with the coupling agent, the internal mixing temperature is 110°C, the time is 30 minutes, and the temperature is lowered to 80°C after the internal mixing is completed.

[0070] Secondary mixing: add 0.9 parts of peroxide BIPB crosslinking agent, the temperature is 80°C, and mix for 15 minutes.

[0071] Crushing: The absorbing material after mixing is in the form of large blocks and needs to be broken into small particles.

[0072] Screening: Use a 20-mesh screen to screen the crushed particles. The purpose of screening is to filter out impurities and larger particles. Larger particles can be re-crushed and then screened.

[0073] Calendering: Add the crushed absorbing particles into the calender. The temperature of the calender roller is 60℃. The absorbing particles are extruded into continuous sheets under the action of temperature and extrusion. The width of the sheet is determined by the width of the baffle plate, and the thickness of the sheet is determined by the gap between the two rollers of the calender.

[0074] Cross-linking: The calendered sheet is introduced into the vulcanizer by the traction device for cross-linking. The cross-linking process will change the adhesive from a linear structure to a network structure, which can improve the strength and temperature resistance of the absorbing material. The cross-linking temperature is 150°C and the time is 2 minutes.

[0075] Laminating and slitting: Laminating double-sided tape on one or both sides according to customer's requirements, and slitting according to the specified width.

[0076] Testing: The magnetic permeability, flexibility, tensile strength, temperature resistance and surface quality of the product were tested. The specific results are shown in Table 1.

[0077] Comparative Example 2

[0078] A flexible electromagnetic shielding composite material mainly comprises a flaky absorber, a main binder, an auxiliary binder, a coupling agent and a cross-linking agent, the specific weight portions are as follows: flaky iron-nickel absorber: 110 portions, wherein the absorber has AD=0.8g / cm3, and a particle size distribution D50=35um, a main binder: 10 portions of SBR, an auxiliary binder: 8 portions of SIS, 2 portions of a titanate coupling agent, and 1.5 portions of a peroxide DCP cross-linking agent.

[0079] The specific production steps are as follows:

[0080] Absorbent treatment: Add 2 parts of coupling agent into 200 parts of alcohol to prepare coupling agent solution. Add the coupling agent solution and absorbent into a kneader, set the temperature to 60°C, and knead for 20 minutes to allow the coupling agent to evenly coat the surface of the absorbent.

[0081] Primary mixing: weigh 8 parts of SIS binder and add them into the mixer, mix them with the absorbent treated with coupling agent, the mixing temperature is 130℃, the mixing time is 20 minutes, then weigh 10 parts of NBR and add them into the mixer for 10 minutes, after the mixing, lower the temperature to 80℃.

[0082] Secondary mixing: add 1.5 parts of peroxide DCP cross-linking agent, the temperature is 80°C, and mix for 15 minutes. Crushing: The absorbing material after mixing is in the form of large blocks and needs to be broken into small particles.

[0083] Screening: Use a 20-mesh screen to screen the crushed particles. The purpose of screening is to filter out impurities and larger particles. Larger particles can be re-crushed and then screened.

[0084] Calendering: Add the crushed absorbing particles into the calender. The temperature of the calender roller is 75℃. The absorbing particles are extruded into continuous sheets under the action of temperature and extrusion. The width of the sheet is determined by the width of the baffle plate, and the thickness of the sheet is determined by the gap between the two rollers of the calender.

[0085] Cross-linking: The calendered sheet is introduced into the vulcanizer by the traction device for cross-linking. The cross-linking process will change the adhesive from a linear structure to a network structure, which can improve the strength and temperature resistance of the absorbing material. The cross-linking temperature is 120°C and the time is 5 minutes.

[0086] Laminating and slitting: Laminating double-sided tape on one or both sides according to customer's requirements, and slitting according to the specified width.

[0087] Testing: The magnetic permeability, flexibility, tensile strength and surface quality of the product were tested. The specific results are shown in Table 1.

[0088] Table 1

[0089]

[0090] Note: Strength 1 is the tensile strength before cross-linking, and Strength 2 is the tensile strength after cross-linking.

[0091] The temperature resistance test principle and evaluation criteria are as follows:

[0092] 1 2 5 4 3

[0093] Table 2

[0094] Take a 100mmX100mm sample of the absorbing material, test the thickness value t1 at 5 points as shown in Table 2 above, put the sample into an oven (150℃, 10 minutes), and test the thickness value t2 at 5 points again. Compare the thickness change before and after putting it into the oven. △t=(t2-t1) / t1*100%. △t≤5%, the temperature resistance is "excellent", 5%<△t≤15%, the temperature resistance is "good", △t﹥15%, the temperature resistance is "poor".

[0095] Embodiment 2

[0096] A preparation device of the flexible electromagnetic shielding composite material described in Example 1 comprises an internal mixer body 1, an internal mixer box 2 is arranged inside the internal mixer body 1, an outer plate 21 is fixedly connected to the outer side of the internal mixer box 2, an electric heating plate is arranged inside the outer plate 21, a rotor 22 is arranged inside the internal mixer box 2, the rotor 22 is externally connected to a motor, an upper push bolt component 3 is arranged on the upper surface of the internal mixer body 1, a side box 11 is fixedly connected to one side of the internal mixer body 1, two groups of the side boxes 11 are arranged symmetrically, a discharging mechanism 4 for auxiliary discharging is arranged between the two groups of the side boxes 11, and a scraper component 24 for preventing material adhesion is arranged inside the internal mixer box 2;

[0097] The discharging mechanism 4 includes a motor A41 fixedly connected to one side of the internal mixer body 1, the output end of the motor A41 is fixedly connected to a rotating shaft 42, one end of the rotating shaft 42 is fixedly connected to one side of the internal mixer box 2, the other side of the internal mixer box 2 is fixedly connected to a connecting rod 46, one end of the connecting rod 46 is rotatably connected to one side of the internal mixer body 1, a side groove 12 is provided on one side of the internal mixer body 1, a rotating rod A44 is rotatably connected between the two groups of side boxes 11, the diameter of the rotating rod A44 is smaller than the rotating shaft 42, the rotating shaft 42 and the outer side of the rotating rod A44 are sleeved with a belt A43, the connecting rod 46 and the outer side of the rotating rod A44 are sleeved with a belt B47, the outer side of the rotating rod A44 is fixedly connected to a limiting plate group 441, and the limiting plate group 441 is provided with two groups in total, and the two groups of limiting plate groups 441 are respectively provided on the belt A43 As well as on both sides of the belt B47, a vibrating component 45 for vibrating the internal mixing box 2 for discharging is fixedly connected to the outer side of the rotating rod A44, and a rubber pad 48 is arranged on the inner wall of the internal mixing box 2, and a magnetic block B481 is fixedly connected to the bottom surface of the rubber pad 48. During the discharging process, the motor A41 is turned on, and the internal mixing box 2 is driven to flip through the rotating shaft 42 and the connecting rod 46. As the inclination angle changes, the discharging work is initially realized. During the rotation of the rotating shaft 42, the belt A43 is used to drive the rotating rod A44 to rotate, thereby driving the vibrating component 45 to rotate. During the tilting process of the internal mixing box 2, the vibrating component 45 is used to knock the bottom surface of the internal mixing box 2, and the material is discharged through vibration. At the same time, the magnetic properties of the vibrating component 45 itself are used in conjunction with the magnetic block B481 to drive the rubber pad 48 to bulge, giving thrust to the material from the bottom to discharge the material.

[0098] The vibration component 45 includes a mounting roller 451 fixedly connected to the outside of the rotating rod A44, a magnet A452 is fixedly connected to the outside of the mounting roller 451, a rubber eccentric block 453 is fixedly connected to the outside of the mounting roller 451, the magnet A452 and the magnet B481 are magnetically repelled, and during the rotation of the mounting roller 451, when the magnet A452 approaches one side of the magnet B481, the rubber pad 48 is lifted up by the magnetic repulsion, and at the same time, the rubber eccentric block 453 knocks on one side of the mixing box 2, and the vibration and bulging assist the discharge of materials.

[0099] The internal mixing box 2 is provided with a pushing component 49 for preventing smaller materials from remaining on the edge of the internal mixing box 2. Both sides of the inner wall of the internal mixing box 2 are provided with flip grooves. The pushing component 49 includes a lifting plate 491 slidably connected to the inside of the flip groove. The bottom surface of the lifting plate 491 passes through one side of the internal mixing box 2. The lifting plate 491 is arranged on the outside of the internal mixing box 2 and is fixedly connected to a bottom plate 492 at one end. The upper surface of the lifting plate 491 is fixedly connected to a spring B499. One end of the spring B499 is fixedly connected to the inner wall of the flip groove. The inner wall of the lifting plate 491 is fixedly connected to a rack plate 498. The inner wall of the flip groove is rotatably connected to a rotating rod B493. The outer side of the rotating rod B493 is fixed It is connected with a gear 494, which is meshed with a rack plate 498. A movable roller 495 is fixedly connected to the outer side of the rotating rod B493, and a push plate 496 is fixedly connected to the outer side of the movable roller 495. A material-blocking soft curtain 497 is fixedly connected between the push plate 496 and the inner wall of the turning groove. During the rotation of the rubber eccentric block 453, the bottom plate 492 is squeezed to compress the lifting plate 491 inside the turning groove, and the rack plate 498 is used to drive the gear 494 to rotate, thereby driving the movable roller 495 to rotate, so that the push plate 496 is lifted, and the remaining material on the edge is pushed to the middle, and discharged in cooperation with the rubber pad 48. The material-blocking soft curtain 497 is used to prevent the material from entering the inside of the turning groove.

[0100] The upper push bolt component 3 includes a hydraulic rod 31 fixedly connected to the upper surface of the internal mixer body 1. The output end of the hydraulic rod 31 observes the internal mixer body 1 and is fixedly connected to a bolt body 32. A lower arc groove 33 is provided on the bottom surface of the bolt body 32. During the internal mixing process, the hydraulic rod 31 is used to drive the bolt body 32 to press down, and the lower arc groove 33 is used to press the material corresponding to the rotor 22 to complete the internal mixing work.

[0101] The scraper assembly 24 includes a movable plate 241 slidably connected to the inside of the mixing box 2, a push plate 243 is fixedly connected to one side of the movable plate 241, a spring A244 is fixedly connected to the bottom surface of the movable plate 241, the bottom end of the spring A244 is fixedly connected to the inner wall of the rotor 22, a side scraper 23 is fixedly connected to the inner wall of the mixing box 2, the side scraper 23 is in contact with the movable plate 241, a magnetic plate B242 is arranged inside the movable plate 241, a magnetic plate A34 is fixedly connected to the outer side of the bolt body 32, the magnetic plate A34 and the magnetic plate B242 are magnetically attracted to each other, when the bolt body 32 is pressed down, the push plate 243 is pressed against to drive the movable plate 241 to be pressed down, and a small amount of material attached to the inner wall of the movable plate 241 during the mixing process is scraped off by the side scraper 23, the magnetic plate B242 and the magnetic plate A34 attract each other to ensure the stability of the connection during the pressing process, and the spring A244 is used to assist the movable plate 241 in resetting.

[0102] Specifically, during the internal mixing process, the bolt body 32 is pressed down against the plate 243 to drive the movable plate 241 to be pressed down, and the side scraper 23 is used to scrape off a small amount of material attached to the inner wall of the movable plate 241 during the internal mixing process, so as to promote internal mixing and reduce the difficulty of subsequent material discharge. During the material discharge process, the motor A41 is turned on, and the rotating shaft 42 and the connecting rod 46 are used to drive the internal mixing box 2 to flip, and the material inside is gradually poured out as the inclination angle changes. During the working process of the rotating shaft 42, the belt A43 is used to drive the rotating rod A44 to rotate, and the mounting roller 451 is driven to rotate, and the rubber eccentric block 453 knocks on one side of the internal mixing box 2, and the material is discharged through vibration. When the magnetic block A452 is close to one side of the magnetic block B481, the rubber pad 48 is lifted up by magnetic repulsion, and the material is pushed from the bottom to be discharged. In addition, the rubber eccentric block 453 squeezes the bottom plate 492 during rotation, compresses the lifting plate 491 inside the turning groove, and the rack plate 498 drives the gear 494 to rotate, thereby driving the movable roller 495 to rotate, so that the push plate 496 is lifted and the remaining material on the edge is pushed to the middle, and discharged in cooperation with the rubber pad 48. The material blocking soft curtain 497 is used to prevent the material from entering the turning groove, and finally achieves the purpose of auxiliary discharge and preventing the material from remaining in the internal mixer and being unable to be discharged, so as to avoid scalding of workers.

[0103] 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.

[0104] 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 flexible electromagnetic shielding composite material, characterized in that: The flexible electromagnetic shielding composite material comprises 100-120 parts of an absorbent, 10-30 parts of a main binder, 0-5 parts of an auxiliary binder, 1-4 parts of a coupling agent, and 0.5-3 parts of a cross-linking agent; The absorbent is of iron silicon aluminum, iron silicon chromium, iron silicon and iron nickel, and has a scaly morphology. When the cumulative particle size distribution percentage of the absorbent reaches 50%, the corresponding particle size is 20-100 μm, and the bulk density of the absorbent is 0.2-1.2 g / cm 3 .

2. The flexible electromagnetic shielding composite material according to claim 1, characterized in that: The main adhesive is ethylene-vinyl acetate copolymer, ethylene propylene diene monomer rubber and styrene-butadiene rubber.

3. The flexible electromagnetic shielding composite material according to claim 1, characterized in that: The auxiliary adhesive is a high polymer of ethylene and butylene, or a styrene-isoprene-styrene block copolymer.

4. The flexible electromagnetic shielding composite material according to claim 1, characterized in that: The coupling agent is selected from titanate and silane. Before use, the coupling agent is first added to alcohol to be diluted into a coupling agent solution.

5. The flexible electromagnetic shielding composite material according to claim 1, characterized in that: The cross-linking agent is selected from peroxides.

6. A preparation device for a flexible electromagnetic shielding composite material according to any one of claims 1 to 5, comprising an internal mixer body (1), an internal mixer box (2) is arranged inside the internal mixer body (1), an outer plate (21) is fixedly connected to the outer side of the internal mixer box (2), an electric heating plate is arranged inside the outer plate (21), a rotor (22) is arranged inside the internal mixer box (2), the rotor (22) is externally connected to a motor, and an upper push bolt component (3) is arranged on the upper surface of the internal mixer body (1), characterized in that: A side box (11) is fixedly connected to one side of the internal mixer body (1), and two groups of the side boxes (11) are provided. The two groups of the side boxes (11) are symmetrically arranged, and a discharge mechanism (4) for assisting material discharge is provided between the two groups of the side boxes (11). A scraper assembly (24) for preventing material from adhering is provided inside the internal mixer box (2); The discharging mechanism (4) comprises a motor A (41) fixedly connected to one side of the internal mixer body (1); the output end of the motor A (41) is fixedly connected to a rotating shaft (42); one end of the rotating shaft (42) is fixedly connected to one side of the internal mixer box (2); the other side of the internal mixer box (2) is fixedly connected to a connecting rod (46); one end of the connecting rod (46) is rotatably connected to one side of the internal mixer body (1); a side groove (12) is provided on one side of the internal mixer body (1); a rotating rod A (44) is rotatably connected between the two sets of the side boxes (11); the diameter of the rotating rod A (44) is smaller than that of the rotating shaft (42); the rotating shaft (42) and the rotating rod A ( A belt A (43) is sleeved on the outer side of the rotating rod A (44), a belt B (47) is sleeved on the outer side of the connecting rod (46) and the rotating rod A (44), a limit plate group (441) is fixedly connected to the outer side of the rotating rod A (44), and two groups of limit plate groups (441) are provided. The two groups of limit plate groups (441) are respectively provided on both sides of the belt A (43) and the belt B (47), and a vibration component (45) for vibrating the internal mixing box (2) for discharging is fixedly connected to the outer side of the rotating rod A (44), and a rubber pad (48) is provided on the inner wall of the internal mixing box (2), and a magnetic block B (481) is fixedly connected to the bottom surface of the rubber pad (48).

7. The device for preparing a flexible electromagnetic shielding composite material according to claim 6, characterized in that: The vibration component (45) comprises a mounting roller (451) fixedly connected to the outside of the rotating rod A (44), a magnetic block A (452) fixedly connected to the outside of the mounting roller (451), a rubber eccentric block (453) fixedly connected to the outside of the mounting roller (451), and the magnetic block A (452) and the magnetic block B (481) magnetically repel each other.

8. The device for preparing a flexible electromagnetic shielding composite material according to claim 6, characterized in that: The internal part of the mixing box (2) is provided with a pushing component (49) for preventing smaller materials from remaining on the edge of the mixing box (2). Both sides of the inner wall of the mixing box (2) are provided with turning grooves. The pushing component (49) includes a lifting plate (491) slidably connected to the inside of the turning groove. The bottom surface of the lifting plate (491) passes through one side of the mixing box (2). The lifting plate (491) is arranged on the outside of the mixing box (2) and is fixedly connected to a bottom plate (492). The upper surface of the lifting plate (491) is fixedly connected to a spring B (499). The spring B ( One end of the lifting plate (499) is fixedly connected to the inner wall of the turnover groove, the inner wall of the lifting plate (491) is fixedly connected to a rack plate (498), the inner wall of the turnover groove is rotatably connected to a rotating rod B (493), the outer side of the rotating rod B (493) is fixedly connected to a gear (494), the gear (494) is meshingly connected to the rack plate (498), the outer side of the rotating rod B (493) is fixedly connected to a movable roller (495), the outer side of the movable roller (495) is fixedly connected to a push plate (496), and a material blocking soft curtain (497) is fixedly connected between the push plate (496) and the inner wall of the turnover groove.

9. The device for preparing a flexible electromagnetic shielding composite material according to claim 6, characterized in that: The upper push bolt component (3) comprises a hydraulic rod (31) fixedly connected to the upper surface of the internal mixer body (1); the output end of the hydraulic rod (31) observes the internal mixer body (1) and is fixedly connected to a bolt body (32); and a lower arc groove (33) is formed on the bottom surface of the bolt body (32).

10. The device for preparing a flexible electromagnetic shielding composite material according to claim 9, characterized in that: The scraper assembly (24) includes a movable plate (241) slidably connected to the inside of the mixing box (2); a stop plate (243) is fixedly connected to one side of the movable plate (241); a spring A (244) is fixedly connected to the bottom surface of the movable plate (241); the bottom end of the spring A (244) is fixedly connected to the inner wall of the rotor (22); a side scraper (23) is fixedly connected to the inner wall of the mixing box (2); the side scraper (23) is fitted with the movable plate (241); a magnetic plate B (242) is arranged inside the movable plate (241); a magnetic plate A (34) is fixedly connected to the outer side of the bolt body (32); and the magnetic plate A (34) and the magnetic plate B (242) are magnetically attracted to each other.

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