Preparation method of electromagnetic shielding resistant composite material and production equipment thereof

Abstract

The application belongs to the field of composite material preparation, and particularly relates to a preparation method and production equipment of an electromagnetic shielding composite material, and the following scheme is proposed: the preparation method of the noise reduction micro-perforated foam metal structural material comprises the following steps: S1: material preparation: prepare 3-5 parts of carbon nanotubes, 4-6 parts of a cross-linking agent, 3-5 parts of a catalyst, 5-7 parts of graphene and 4-6 parts of an active agent; S2: ball milling treatment: the carbon nanotubes and the graphene are added to a ball mill for ball milling treatment to obtain carbon nanotube powder and graphene powder respectively; S3: mixing treatment: the carbon nanotube powder and the graphene powder are mixed, and the cross-linking agent, the catalyst and the active agent are gradually added during the mixing treatment to obtain mixed slurry; and S4: casting forming: the mixed slurry is added to a mold. The application effectively reduces the production cost, and the preparation process is relatively simple, and the prepared electromagnetic shielding composite material has high electromagnetic shielding efficiency.

Description

Technical Field

[0001] This invention relates to the field of composite material preparation technology, and in particular to a method for preparing an electromagnetic shielding composite material and its production equipment. Background Technology

[0002] The advancement of electronic technology and the rapid development of the information industry have inevitably brought about electromagnetic radiation problems. Electromagnetic interference and radio frequency interference caused by electromagnetic radiation not only lead to electronic equipment malfunctions, communication interruptions, and electromagnetic information leaks, but also seriously endanger human living environments and health. Therefore, the development of new and highly efficient electromagnetic shielding materials has gradually attracted widespread attention.

[0003] Electromagnetic shielding materials have seen widespread demand in recent years in fields such as national defense and have received increasing attention from researchers across various sectors. Polymer materials possess numerous advantages, including ease of processing, low cost, and light weight, leading to a surge in research on electromagnetic shielding materials based on polymers. Furthermore, carbon materials, due to their low density, high conductivity, corrosion resistance, and ease of processing, are among the most ideal electromagnetic shielding materials.

[0004] However, most electromagnetic shielding materials on the market are made from metal materials, which are expensive, have poor flexibility, and cannot be applied to high-end electronics industries. Furthermore, the preparation process is relatively complicated, and the electromagnetic shielding performance of the resulting electromagnetic shielding composite material is low. Therefore, a preparation method and production equipment for electromagnetic shielding composite materials are proposed to solve the above problems. Summary of the Invention

[0005] The purpose of this invention is to address the shortcomings of existing electromagnetic shielding composite materials, such as high processing costs, cumbersome preparation processes, and low electromagnetic shielding effectiveness, and to propose a method for preparing electromagnetic shielding composite materials and its production equipment.

[0006] To achieve the above objectives, the present invention adopts the following technical solution:

[0007] A method for preparing an electromagnetic shielding composite material includes the following steps:

[0008] S1: Material preparation: Prepare 3-5 parts of carbon nanotubes, 4-6 parts of crosslinking agent, 3-5 parts of catalyst, 5-7 parts of graphene and 4-6 parts of activator;

[0009] S2: Ball milling treatment: Carbon nanotubes and graphene are added to a ball mill for ball milling treatment to obtain carbon nanotube powder and graphene powder respectively;

[0010] S3: Mixing treatment: Carbon nanotube powder and graphene powder are mixed. During the mixing treatment, crosslinking agent, catalyst and activator are gradually added to obtain a mixed slurry.

[0011] S4: Casting and molding: The mixed slurry is added into the mold, the mold is placed in the drying oven for drying, and after drying, the mixed slurry is hot-pressed and molded by a hot press to obtain a preliminary sample;

[0012] S5: Sintering treatment: The preliminary sample is sintered to obtain the electromagnetic shielding composite material.

[0013] S6: Visual inspection: Inspect the appearance of the electromagnetic shielding composite material. After passing the inspection, proceed with packaging.

[0014] Preferably, in step S2, after ball milling, the carbon nanotube powder and graphene powder are sieved using a 30-40 mesh sieve.

[0015] Preferably, in S3, the crosslinking agent is hydroxyl silicone oil, the catalyst is platinum, and the activator is sodium dodecyl sulfate.

[0016] Preferably, in step S3, the mixing speed is set to 120-220 r / min, and the mixing time is set to 20-30 min.

[0017] Preferably, in step S4, the drying temperature is set to 60-80℃ and the drying time is set to 60-80min.

[0018] Preferably, in step S5, the preliminary sample is first kept at 300℃ for 1-3 hours, at 600℃ for 1-3 hours, at 1000℃ for 1-3 hours, and at 200℃ for 1-3 hours.

[0019] This invention also proposes a production device based on the preparation method of the electromagnetic shielding composite material described in any one of the above claims, comprising a machine body, a protective cover fixedly connected to the top of the machine body, a square hole opened at the top of the machine body, a square frame slidably connected within the square hole, a bearing fixedly connected within the square frame, a rotating tube fixedly connected within the bearing, a one-way valve fixedly connected to the bottom end of the rotating tube, multiple mixing blades fixedly connected to the outside of the rotating tube, a side plate fixedly connected to one side of the square frame, a servo motor fixedly connected to the top of the side plate, and an output shaft of the servo motor. Gears are fixedly fitted on the outer sides of both the upper and rotating tubes, and the two gears mesh with each other. An exhaust fan is fixedly connected to the inner wall of the top of the protective cover, and an air outlet pipe is fixedly connected to the bottom of the exhaust fan. The air outlet pipe is in sealed contact with the inner wall of the rotating tube. A spring is welded to the bottom of the side plate, and the bottom end of the spring is welded to the top of the body. A drive motor is fixedly connected to the inner wall of the protective cover, and a cam is fixedly connected to the output shaft of the drive motor. The cam is in contact with the top of the side plate. An air inlet pipe is fixedly connected to the top of the exhaust fan and is fixedly installed on the protective cover.

[0020] Preferably, the top of the machine body is provided with a feeding hole, and the bottom of the machine body is fixedly connected with a discharge pipe, and a valve is fixedly connected to the discharge pipe.

[0021] The beneficial effects of this invention are:

[0022] (1) Only carbon nanotubes, crosslinking agents, catalysts, graphene and activators are needed, and no metal materials are required, which effectively reduces production costs;

[0023] (2) The prepared mixed slurry is cast into a mold to promote a more stable structure. Finally, the electromagnetic shielding and high temperature resistance of the composite material are further improved by sintering.

[0024] (3) Only by starting the servo motor, the two gears can be rotated, which in turn can drive the mixing blade to rotate. The mixing blade mixes the material. During the rotation of the mixing blade, the drive motor and the exhaust fan are started at the same time to draw in outside air and discharge it into the material through the rotating pipe, thereby improving the mixing effect of the material. The drive motor can drive the cam to rotate, and through the matching side plate and spring, the rotating pipe can drive the mixing blade to move back and forth vertically, effectively improving the mixing effect of the material. Attached Figure Description

[0025] Figure 1 This is a schematic diagram of the production equipment for a method of preparing electromagnetic shielding composite material proposed in this invention;

[0026] Figure 2 This is a cross-sectional schematic diagram of the production equipment for a method of preparing an electromagnetic shielding composite material proposed in this invention;

[0027] Figure 3 for Figure 2 A schematic diagram of the structure of part A.

[0028] In the diagram: 1. Body; 2. Protective cover; 3. Frame; 4. Rotary tube; 5. Mixing blade; 6. Side plate; 7. Servo motor; 8. Gear; 9. Exhaust fan; 10. Exhaust pipe; 11. Spring; 12. Drive motor; 13. Cam; 14. Bearing. Detailed Implementation

[0029] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments.

[0030] Example 1

[0031] Reference Figure 1-3 A method for preparing an electromagnetic shielding composite material includes the following steps:

[0032] S1: Material preparation: Prepare 3 parts carbon nanotubes, 4 parts crosslinking agent, 3 parts catalyst, 5 parts graphene and 4 parts activator;

[0033] S2: Ball milling treatment: Carbon nanotubes and graphene are added to a ball mill for ball milling treatment to obtain carbon nanotube powder and graphene powder respectively;

[0034] S3: Mixing treatment: Carbon nanotube powder and graphene powder are mixed. During the mixing treatment, crosslinking agent, catalyst and activator are gradually added to obtain a mixed slurry.

[0035] S4: Casting and molding: The mixed slurry is added into the mold, the mold is placed in the drying oven for drying, and after drying, the mixed slurry is hot-pressed and molded by a hot press to obtain a preliminary sample;

[0036] S5: Sintering treatment: The preliminary sample is sintered to obtain the electromagnetic shielding composite material.

[0037] S6: Visual inspection: Inspect the appearance of the electromagnetic shielding composite material. After passing the inspection, proceed with packaging.

[0038] In this invention, in step S2, after ball milling, carbon nanotube powder and graphene powder are sieved using a 30-mesh sieve. In step S3, the crosslinking agent is hydroxyl silicone oil, the catalyst is platinum, and the activator is sodium dodecyl sulfate. In step S3, the mixing speed is set to 120 r / min, and the mixing time is set to 20 min. In step S4, the drying temperature is set to 60℃, and the drying time is set to 60 min. In step S5, the preliminary sample is first kept at 300℃ for 1 h, then at 600℃ for 1 h, then at 1000℃ for 1 h, and finally at 200℃ for 1 h.

[0039] This invention also proposes a production equipment based on any of the above-mentioned methods for preparing electromagnetic shielding composite materials, comprising a body 1, a protective cover 2 fixedly connected to the top of the body 1, a square hole opened at the top of the body 1, a square frame 3 slidably connected within the square hole, a bearing 14 fixedly connected within the square frame 3, a rotating tube 4 fixedly connected within the bearing 14, a one-way valve fixedly connected to the bottom of the rotating tube 4, and multiple mixing blades 5 fixedly connected to the outside of the rotating tube 4. A side plate 6 is fixedly connected to one side of the square frame 3, a servo motor 7 is fixedly connected to the top of the side plate 6, gears 8 are fixedly fitted on the output shaft of the servo motor 7 and the outside of the rotating tube 4, and the two gears 8 mesh with each other. An exhaust fan 9 is fixedly connected to the inner wall of the top of the protective cover 2, an exhaust pipe 10 is fixedly connected to the bottom of the exhaust fan 9, and the exhaust pipe 10 is in sealed contact with the inner wall of the rotating tube 4. A spring 11 is welded to the bottom of the side plate 6, and the bottom end of the spring 11 is welded to the top of the body 1. A drive motor 12 is connected, and a cam 13 is fixedly connected to the output shaft of the drive motor 12. The cam 13 contacts the top of the side plate 6. An air inlet pipe is fixedly connected to the top of the exhaust fan 9, and the air inlet pipe is fixedly installed on the protective cover 2. A feeding hole is opened at the top of the machine body 1, and a discharge pipe is fixedly connected to the bottom of the machine body 1. A valve is fixedly connected to the discharge pipe. When the servo motor 7, drive motor 12 and exhaust fan 9 are started at the same time, the output shaft of the servo motor 7 drives a gear 8 to rotate, which in turn drives the rotating tube 4 to rotate through another gear 8, thereby enabling the mixing blade 5 to mix the material. The exhaust fan 9 can draw outside air into the machine body 1 to improve the mixing effect of the material in the machine body 1. The drive motor 12 can drive the cam 13 to rotate, and through the cooperating spring 11, the side plate 6 and the square frame 3 can move vertically back and forth, thereby enabling the mixing blade 5 to move vertically back and forth, improving the mixing effect.

[0040] Example 2

[0041] Reference Figure 1-3 A method for preparing an electromagnetic shielding composite material includes the following steps:

[0042] S1: Material preparation: Prepare 4 parts carbon nanotubes, 5 parts crosslinking agent, 4 parts catalyst, 6 parts graphene and 5 parts activator;

[0043] S2: Ball milling treatment: Carbon nanotubes and graphene are added to a ball mill for ball milling treatment to obtain carbon nanotube powder and graphene powder respectively;

[0044] S3: Mixing treatment: Carbon nanotube powder and graphene powder are mixed. During the mixing treatment, crosslinking agent, catalyst and activator are gradually added to obtain a mixed slurry.

[0045] S4: Casting and molding: The mixed slurry is added into the mold, the mold is placed in the drying oven for drying, and after drying, the mixed slurry is hot-pressed and molded by a hot press to obtain a preliminary sample;

[0046] S5: Sintering treatment: The preliminary sample is sintered to obtain the electromagnetic shielding composite material.

[0047] S6: Visual inspection: Inspect the appearance of the electromagnetic shielding composite material. After passing the inspection, proceed with packaging.

[0048] In this invention, in step S2, after ball milling, carbon nanotube powder and graphene powder are sieved using a 35-mesh sieve. In step S3, the crosslinking agent is hydroxyl silicone oil, the catalyst is platinum, and the activator is sodium dodecyl sulfate. In step S3, the mixing speed is set to 160 r / min, and the mixing time is set to 25 min. In step S4, the drying temperature is set to 70℃, and the drying time is set to 70 min. In step S5, the preliminary sample is first kept at 300℃ for 2 h, then at 600℃ for 2 h, then at 1000℃ for 2 h, and finally at 200℃ for 2 h.

[0049] This invention also proposes a production equipment based on any of the above-mentioned methods for preparing electromagnetic shielding composite materials, comprising a body 1, a protective cover 2 fixedly connected to the top of the body 1, a square hole opened at the top of the body 1, a square frame 3 slidably connected within the square hole, a bearing 14 fixedly connected within the square frame 3, a rotating tube 4 fixedly connected within the bearing 14, a one-way valve fixedly connected to the bottom of the rotating tube 4, and multiple mixing blades 5 fixedly connected to the outside of the rotating tube 4. A side plate 6 is fixedly connected to one side of the square frame 3, a servo motor 7 is fixedly connected to the top of the side plate 6, gears 8 are fixedly fitted on the output shaft of the servo motor 7 and the outside of the rotating tube 4, and the two gears 8 mesh with each other. An exhaust fan 9 is fixedly connected to the inner wall of the top of the protective cover 2, an exhaust pipe 10 is fixedly connected to the bottom of the exhaust fan 9, and the exhaust pipe 10 is in sealed contact with the inner wall of the rotating tube 4. A spring 11 is welded to the bottom of the side plate 6, and the bottom end of the spring 11 is welded to the top of the body 1. A drive motor 12 is connected, and a cam 13 is fixedly connected to the output shaft of the drive motor 12. The cam 13 contacts the top of the side plate 6. An air inlet pipe is fixedly connected to the top of the exhaust fan 9, and the air inlet pipe is fixedly installed on the protective cover 2. A feeding hole is opened at the top of the machine body 1, and a discharge pipe is fixedly connected to the bottom of the machine body 1. A valve is fixedly connected to the discharge pipe. When the servo motor 7, drive motor 12 and exhaust fan 9 are started at the same time, the output shaft of the servo motor 7 drives a gear 8 to rotate, which in turn drives the rotating tube 4 to rotate through another gear 8, thereby enabling the mixing blade 5 to mix the material. The exhaust fan 9 can draw outside air into the machine body 1 to improve the mixing effect of the material in the machine body 1. The drive motor 12 can drive the cam 13 to rotate, and through the cooperating spring 11, the side plate 6 and the square frame 3 can move vertically back and forth, thereby enabling the mixing blade 5 to move vertically back and forth, improving the mixing effect.

[0050] Example 3

[0051] Reference Figure 1-3 A method for preparing an electromagnetic shielding composite material includes the following steps:

[0052] S1: Material preparation: Prepare 5 parts carbon nanotubes, 6 parts crosslinking agent, 5 parts catalyst, 7 parts graphene and 6 parts activator;

[0053] S2: Ball milling treatment: Carbon nanotubes and graphene are added to a ball mill for ball milling treatment to obtain carbon nanotube powder and graphene powder respectively;

[0054] S3: Mixing treatment: Carbon nanotube powder and graphene powder are mixed. During the mixing treatment, crosslinking agent, catalyst and activator are gradually added to obtain a mixed slurry.

[0055] S4: Casting and molding: The mixed slurry is added into the mold, the mold is placed in the drying oven for drying, and after drying, the mixed slurry is hot-pressed and molded by a hot press to obtain a preliminary sample;

[0056] S5: Sintering treatment: The preliminary sample is sintered to obtain the electromagnetic shielding composite material.

[0057] S6: Visual inspection: Inspect the appearance of the electromagnetic shielding composite material. After passing the inspection, proceed with packaging.

[0058] In this invention, in step S2, after ball milling, carbon nanotube powder and graphene powder are sieved using a 40-mesh sieve. In step S3, the crosslinking agent is hydroxyl silicone oil, the catalyst is platinum, and the activator is sodium dodecyl sulfate. In step S3, the mixing speed is set to 220 r / min, and the mixing time is set to 30 min. In step S4, the drying temperature is set to 80℃, and the drying time is set to 80 min. In step S5, the preliminary sample is first kept at 300℃ for 3 h, then at 600℃ for 3 h, then at 1000℃ for 3 h, and finally at 200℃ for 3 h.

[0059] This invention also proposes a production equipment based on any of the above-mentioned methods for preparing electromagnetic shielding composite materials, comprising a body 1, a protective cover 2 fixedly connected to the top of the body 1, a square hole opened at the top of the body 1, a square frame 3 slidably connected within the square hole, a bearing 14 fixedly connected within the square frame 3, a rotating tube 4 fixedly connected within the bearing 14, a one-way valve fixedly connected to the bottom of the rotating tube 4, and multiple mixing blades 5 fixedly connected to the outside of the rotating tube 4. A side plate 6 is fixedly connected to one side of the square frame 3, a servo motor 7 is fixedly connected to the top of the side plate 6, gears 8 are fixedly fitted on the output shaft of the servo motor 7 and the outside of the rotating tube 4, and the two gears 8 mesh with each other. An exhaust fan 9 is fixedly connected to the inner wall of the top of the protective cover 2, an exhaust pipe 10 is fixedly connected to the bottom of the exhaust fan 9, and the exhaust pipe 10 is in sealed contact with the inner wall of the rotating tube 4. A spring 11 is welded to the bottom of the side plate 6, and the bottom end of the spring 11 is welded to the top of the body 1. A drive motor 12 is connected, and a cam 13 is fixedly connected to the output shaft of the drive motor 12. The cam 13 contacts the top of the side plate 6. An air inlet pipe is fixedly connected to the top of the exhaust fan 9, and the air inlet pipe is fixedly installed on the protective cover 2. A feeding hole is opened at the top of the machine body 1, and a discharge pipe is fixedly connected to the bottom of the machine body 1. A valve is fixedly connected to the discharge pipe. When the servo motor 7, drive motor 12 and exhaust fan 9 are started at the same time, the output shaft of the servo motor 7 drives a gear 8 to rotate, which in turn drives the rotating tube 4 to rotate through another gear 8, thereby enabling the mixing blade 5 to mix the material. The exhaust fan 9 can draw outside air into the machine body 1 to improve the mixing effect of the material in the machine body 1. The drive motor 12 can drive the cam 13 to rotate, and through the cooperating spring 11, the side plate 6 and the square frame 3 can move vertically back and forth, thereby enabling the mixing blade 5 to move vertically back and forth, improving the mixing effect.

[0060] The electromagnetic shielding effectiveness of the electromagnetic shielding composite materials prepared in Examples 1-3 was tested, and the results are shown in the table below:

[0061]

[0062]

[0063] It can be seen that the electromagnetic shielding composite material prepared by the present invention has good electromagnetic shielding effectiveness, and Example 2 is the best embodiment.

[0064] The foregoing has shown and described the basic principles, main features, and advantages of the present invention. It will be apparent to those skilled in the art that the invention is not limited to the details of the exemplary embodiments described above, and that the invention can be implemented in other specific forms without departing from its spirit or essential characteristics. Therefore, the embodiments should be considered illustrative and non-limiting in all respects, and the scope of the invention is defined by the appended claims rather than the foregoing description. Thus, all variations falling within the meaning and scope of equivalents of the claims are intended to be included within the scope of the invention. No reference numerals in the claims should be construed as limiting the scope of the claims.

[0065] Furthermore, it should be understood that although this specification describes embodiments, not every embodiment contains only one independent technical solution. This narrative style is merely for clarity. Those skilled in the art should consider the specification as a whole, and the technical solutions in each embodiment can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.

Claims

1. A method for producing an electromagnetic shielding composite material, characterized by, Includes the following steps: S1: Material preparation: Prepare 3-5 parts of carbon nanotubes, 4-6 parts of crosslinking agent, 3-5 parts of catalyst, 5-7 parts of graphene and 4-6 parts of activator; S2: Ball milling treatment: Carbon nanotubes and graphene are added to a ball mill for ball milling treatment to obtain carbon nanotube powder and graphene powder respectively; S3: Mixing treatment: Carbon nanotube powder and graphene powder are mixed. During the mixing treatment, crosslinking agent, catalyst and activator are gradually added to obtain a mixed slurry. S4: Casting: The mixed slurry is added into the mold, the mold is placed in the drying oven for drying, and after drying, the mixed slurry is hot-pressed into a preliminary sample by a hot press. S5: Sintering treatment: The preliminary sample is sintered to obtain the electromagnetic shielding composite material. S6: Visual inspection: Inspect the appearance of the electromagnetic shielding composite material. After passing the inspection, proceed with packaging. In step S5, the preliminary sample is first kept at 300℃ for 1-3 hours, at 600℃ for 1-3 hours, at 1000℃ for 1-3 hours, and at 200℃ for 1-3 hours.

2. The method for preparing an electromagnetic shielding composite material according to claim 1, characterized in that, In step S2, after ball milling, the carbon nanotube powder and graphene powder are sieved using a 30-40 mesh sieve.

3. The method for preparing an electromagnetic shielding composite material according to claim 1, characterized in that, In S3, the crosslinking agent is hydroxyl silicone oil, the catalyst is platinum, and the activator is sodium dodecyl sulfate.

4. The method for preparing an electromagnetic shielding composite material according to claim 1, characterized in that, In step S3, the mixing speed is set to 120-220 r / min, and the mixing time is set to 20-30 min.

5. The method for preparing an electromagnetic shielding composite material according to claim 1, characterized in that, In step S4, the drying temperature is set to 60-80℃ and the drying time is set to 60-80min.

6. A production apparatus for the preparation method of the electromagnetic shielding composite material according to any one of claims 1 to 5, characterized in that, Includes a body (1), a protective cover (2) fixedly connected to the top of the body (1), a square hole opened at the top of the body (1), a square frame (3) slidably connected in the square hole, a bearing (14) fixedly connected in the square frame (3), a rotating tube (4) fixedly connected in the bearing (14), a one-way valve fixedly connected to the bottom of the rotating tube (4), multiple mixing blades (5) fixedly connected to the outside of the rotating tube (4), a side plate (6) fixedly connected to one side of the square frame (3), a servo motor (7) fixedly connected to the top of the side plate (6), gears (8) fixedly fitted on the output shaft of the servo motor (7) and the outside of the rotating tube (4), two gears (8) The protective cover (2) is meshed with the exhaust fan (9) fixedly connected to the inner wall of the top. The exhaust fan (9) is fixedly connected to the bottom of the exhaust pipe (10). The exhaust pipe (10) is in sealed contact with the inner wall of the rotating pipe (4). The side plate (6) is welded with a spring (11). The bottom end of the spring (11) is welded to the top of the body (1). The protective cover (2) is fixedly connected to the inner wall. The drive motor (12) is fixedly connected to the output shaft of the drive motor (12). The cam (13) is in contact with the top of the side plate (6). The exhaust fan (9) is fixedly connected to the top of the exhaust pipe. The exhaust pipe is fixedly installed on the protective cover (2).

7. The production equipment for the preparation method of the electromagnetic shielding composite material according to claim 6, characterized in that, The top of the machine body (1) is provided with a feeding hole, and the bottom of the machine body (1) is fixedly connected with a discharge pipe, and a valve is fixedly connected to the discharge pipe.

Images