CN113248910A - Electromagnetic shielding plastic particle - Google Patents
Electromagnetic shielding plastic particle Download PDFInfo
- Publication number
- CN113248910A CN113248910A CN202110605954.5A CN202110605954A CN113248910A CN 113248910 A CN113248910 A CN 113248910A CN 202110605954 A CN202110605954 A CN 202110605954A CN 113248910 A CN113248910 A CN 113248910A
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- parts
- electromagnetic shielding
- nylon
- fiber filler
- carbon fiber
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L77/00—Compositions of polyamides obtained by reactions forming a carboxylic amide link in the main chain; Compositions of derivatives of such polymers
- C08L77/02—Polyamides derived from omega-amino carboxylic acids or from lactams thereof
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- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05K—PRINTED CIRCUITS; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS
- H05K9/00—Screening of apparatus or components against electric or magnetic fields
- H05K9/0073—Shielding materials
- H05K9/0081—Electromagnetic shielding materials, e.g. EMI, RFI shielding
- H05K9/009—Electromagnetic shielding materials, e.g. EMI, RFI shielding comprising electro-conductive fibres, e.g. metal fibres, carbon fibres, metallised textile fibres, electro-conductive mesh, woven, non-woven mat, fleece, cross-linked
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
- C08K3/00—Use of inorganic substances as compounding ingredients
- C08K3/02—Elements
- C08K3/08—Metals
- C08K2003/0812—Aluminium
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- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Medicinal Chemistry (AREA)
- Health & Medical Sciences (AREA)
- Polymers & Plastics (AREA)
- Organic Chemistry (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Textile Engineering (AREA)
- Physics & Mathematics (AREA)
- Electromagnetism (AREA)
- Microelectronics & Electronic Packaging (AREA)
- Shielding Devices Or Components To Electric Or Magnetic Fields (AREA)
- Compositions Of Macromolecular Compounds (AREA)
Abstract
The invention relates to the technical field of electromagnetic shielding plastics, in particular to electromagnetic shielding plastic particles. The electromagnetic shielding plastic particle comprises the following components: 30-40 parts of nylon; 30-40 parts of carbon fiber filler; 20-30 parts of metal fiber filler; 5-10 parts of a light stabilizer; 1.0-2.0 parts of a lubricant; 0.3-0.5 part of antioxidant; 0.3-0.5 part of silane coupling agent. The electromagnetic shielding plastic particle adopts the mixture of the carbon fiber and the metal fiber filler, and has the advantages of carbon black, metal and fiber filling.
Description
Technical Field
Relates to the technical field of electromagnetic shielding plastics, in particular to electromagnetic shielding plastic particles.
Background
A large number of integrated circuit components are used in electronic and electric products, and when the integrated circuit components work, high-frequency pulses are emitted to form electromagnetic wave noise. Electronic components are easily interfered by external electromagnetic signals to cause various obstacles, namely electromagnetic compatibility (EMC). The electromagnetic shielding material mainly solves this problem.
The filling type electromagnetic shielding plastic in the current market comprises a carbon black filling type, a metal filling type and a fiber filling type, and each filling mode has advantages and disadvantages. The carbon black filled type is low in price, but the conductivity is low, so that the electromagnetic shielding capability is poor; the metal filling type has high conductivity and strong electromagnetic shielding performance, but the metal powder (gold, silver, copper and nickel) used by the metal filling type is expensive and is not suitable for large-scale use; the fiber filling type has better electromagnetic shielding effect, mechanical property and heat conducting property, and has the defects of easy generation of winding and breaking in the forming process, high requirement on the forming process and difficult batch production.
Disclosure of Invention
The invention aims to provide the composite filling plastic which has low process requirement, is convenient to produce and low in cost, simultaneously uses the carbon fiber and the metal fiber and has the advantages of carbon black, metal and fiber filling.
In order to overcome the defects in the background art, the technical scheme adopted by the invention for solving the technical problems is as follows: an electromagnetic shielding plastic particle, comprising: the plastic is prepared from the following components in parts by weight:
30-40 parts of nylon;
30-40 parts of carbon fiber filler;
20-30 parts of metal fiber filler;
5-10 parts of a light stabilizer;
1.0-2.0 parts of a lubricant;
0.3-0.5 part of antioxidant;
0.3-0.5 part of silane coupling agent.
The relative viscosity of the nylon 6 is 2.0-2.4; the carbon fiber filler is chopped carbon fiber with the diameter of 1-10 mm; the metal fibers are filiform aluminum fibers; the light stabilizer is rutile titanium dioxide; the lubricant is polyethylene wax; the antioxidant is phosphite ester; the silane coupling agent is KH-602.
The preparation method of the electromagnetic shielding plastic particle comprises the following steps:
(1) firstly, placing nylon and carbon fiber filler into a high-speed mixer, simultaneously adding a light stabilizer, a lubricant, an antioxidant and a silane coupling agent into the high-speed mixer, starting the high-speed mixer, and rotating at the rotating speed of 6000-8000 revolutions per minute for 10-15 minutes to prepare a uniform mixture for later use;
(2) and (2) extruding and granulating the mixture prepared in the step (1) by using a double-screw extruder, wherein the metal fiber is added from a metal fiber inlet of the granulator in the process, the processing temperature in the process is 300-.
According to the technical scheme, due to the fact that nylon exists and the whole plastic particles are convenient to form and manufacture; and the filling metal wire provides the conductivity of the plastic particles, so that the electromagnetic shielding effect can be improved.
Detailed Description
The following examples illustrate preferred embodiments of the present application.
Detailed description of the preferred embodiment
An electromagnetic shielding plastic particle is prepared from the following components in parts by weight: 33 parts of nylon 6 and 30 parts of carbon fiber filler; 25 parts of a metal fiber filler; 10 parts of light stabilizer rutile type titanium dioxide; 1.2 parts of lubricant polyethylene wax; 0.4 part of antioxidant is antioxidant phosphite ester 0.4 part of silane coupling agent KH-602.
The preparation method comprises the following steps: (1) firstly, placing nylon and carbon fiber filler into a high-speed mixer, simultaneously adding a light stabilizer, a lubricant, an antioxidant and a silane coupling agent into the high-speed mixer, starting the high-speed mixer, and rotating at the rotating speed of 6000-8000 revolutions per minute for 10-15 minutes to prepare a uniform mixture for later use; (2) and (2) extruding and granulating the mixture prepared in the step (1) by using a double-screw extruder, wherein the metal fiber is added from a metal fiber inlet of the granulator in the process, the processing temperature in the process is 300-. The K value (thermal coefficient) of the prepared electromagnetic shielding plastic particles is 10.5 w/(m.k); a volume resistivity of less than 3.5 Ω cm; the shielding performance is 110dB under the condition of 500 MHz.
According to the technical scheme, due to the fact that nylon exists and the whole plastic particles are convenient to form and manufacture; and the filling metal wire provides the conductivity of the plastic particles, so that the electromagnetic shielding effect can be improved. The electromagnetic shielding plastic has the advantages of low manufacturing raw material cost and simple forming process.
Detailed description of the invention
This example differs from the first example only in the parts by weight of the various components, specifically, these parts by weight include: 40 parts of nylon 6; 33 parts of carbon fiber filler; 20 parts of metal fiber filler; 5 parts of light stabilizer rutile type titanium dioxide; 1.4 parts of lubricant polyethylene wax, 0.3 part of antioxidant is 0.3 part of antioxidant phosphite ester, and the silane coupling agent KH-602.
The preparation method comprises the following steps: (1) firstly, placing nylon and carbon fiber filler into a high-speed mixer, simultaneously adding a light stabilizer, a lubricant, an antioxidant and a silane coupling agent into the high-speed mixer, starting the high-speed mixer, and rotating at the rotating speed of 6000-8000 revolutions per minute for 10-15 minutes to prepare a uniform mixture for later use; (2) and (2) extruding and granulating the mixture prepared in the step (1) by using a double-screw extruder, wherein the metal fiber is added from a metal fiber inlet of the granulator in the process, the processing temperature in the process is 300-. The K value (thermal conductivity) of the prepared electromagnetic shielding plastic particles is 8.5 w/(m.k); a volume resistivity of less than 4.0 Ω cm; the shielding performance is 100dB under the condition of 500 MHz.
Detailed description of the preferred embodiment
The embodiment provides a plastic electromagnetic shielding case for an electronic product, which comprises the following components in parts by weight: 30-40 parts of nylon; 30-40 parts of carbon fiber filler; 20-30 parts of metal fiber filler; 5-10 parts of a light stabilizer; 1.0-2.0 parts of a lubricant; 0.3-0.5 part of antioxidant; 0.3-0.5 part of silane coupling agent.
Preferably, the components in parts by weight can also be: 33 parts of nylon 6 and 30 parts of carbon fiber filler; 25 parts of a metal fiber filler; 10 parts of light stabilizer rutile type titanium dioxide; 1.2 parts of lubricant polyethylene wax; 0.4 part of antioxidant is antioxidant phosphite ester 0.4 part of silane coupling agent KH-602.
Preferably, the components in parts by weight can also be: 40 parts of nylon 6; 33 parts of carbon fiber filler; 20 parts of metal fiber filler; 5 parts of light stabilizer rutile type titanium dioxide; 1.4 parts of lubricant polyethylene wax, 0.3 part of antioxidant is 0.3 part of antioxidant phosphite ester, and the silane coupling agent KH-602.
Preferably, the method for manufacturing the plastic electromagnetic shielding case for electronic products comprises the steps of: (1) firstly, placing nylon and carbon fiber filler into a high-speed mixer, simultaneously adding a light stabilizer, a lubricant, an antioxidant and a silane coupling agent into the high-speed mixer, starting the high-speed mixer, and rotating at the rotating speed of 6000-8000 revolutions per minute for 10-15 minutes to prepare a uniform mixture for later use; (2) and (2) extruding and granulating the mixture prepared in the step (1) by using a double-screw extruder, wherein the metal fiber is added from a metal fiber inlet of the granulator in the process, the processing temperature in the process is 300-. (3) And melting and casting the plastic particles to form the plastic electromagnetic shielding cover.
Preferably, the method for manufacturing the plastic electromagnetic shielding case for electronic products comprises the steps of: (1) firstly, placing nylon and carbon fiber filler into a high-speed mixer, simultaneously adding a light stabilizer, a lubricant, an antioxidant and a silane coupling agent into the high-speed mixer, starting the high-speed mixer, and rotating at the rotating speed of 6000-8000 revolutions per minute for 10-15 minutes to prepare a uniform mixture for later use;
(2) melting and casting the mixture formed in the step (1) to form the plastic electromagnetic shielding cover, and adding metal fibers in the process.
The metal fibers form a wire mesh-shaped structure in the electromagnetic shielding cover, so that an electromagnetic shielding cage is formed, a good electromagnetic shielding effect can be formed, and the shielding performance is 100dB under the condition of 500 MHz. The electromagnetic shielding cover is of an open hexahedral structure capable of completely covering the electronic element, a containing cavity is arranged in the electromagnetic shielding cover, the electronic element enters the shielding cover through the opening of the hexahedron, and the electronic shielding cover is connected with a PCB of the electronic element through sealant.
It should be understood that the above examples are only for clarity of illustration and are not intended to limit the embodiments. Other variations and modifications will be apparent to persons skilled in the art in light of the above description. And are neither required nor exhaustive of all embodiments. And obvious variations or modifications therefrom are within the scope of the invention.
Claims (4)
1. The electromagnetic shielding plastic particle is characterized by being prepared from the following components in parts by weight:
30-40 parts of nylon;
30-40 parts of carbon fiber filler;
20-30 parts of metal fiber filler;
5-10 parts of a light stabilizer;
1.0-2.0 parts of a lubricant;
0.3-0.5 part of antioxidant;
0.3-0.5 part of silane coupling agent.
2. The electromagnetically shielding plastic particle as claimed in claim 1, wherein said nylon is nylon 6, and said nylon 6 has a relative viscosity of 2.0 to 2.4; the carbon fiber filler is chopped carbon fiber with the diameter of 1-10 mm; the metal fibers are filiform aluminum fibers; the light stabilizer is rutile titanium dioxide; the lubricant is polyethylene wax; the antioxidant is phosphite ester; the silane coupling agent is KH-602.
3. A method for manufacturing electromagnetic shielding plastic particles is characterized in that,
a. the following components are taken according to parts by weight:
30-40 parts of nylon;
30-40 parts of carbon fiber filler;
20-30 parts of metal fiber filler;
5-10 parts of a light stabilizer;
1.0-2.0 parts of a lubricant;
0.3-0.5 part of antioxidant;
0.3-0.5 part of silane coupling agent;
b. placing nylon and carbon fiber filler into a high-speed mixer, simultaneously adding a light stabilizer, a lubricant, an antioxidant and a silane coupling agent into the high-speed mixer, starting the high-speed mixer, and rotating at the rotating speed of 6000-8000 revolutions per minute for 10-15 minutes to prepare a uniform mixture for later use;
c. and c, extruding and granulating the mixture prepared in the step b by using a double-screw extruder, adding metal fibers from a metal fiber inlet of the granulator in the process, and finally preparing the electromagnetic shielding plastic particles at the processing temperature of 300-.
4. The EMI shielding plastic particle as claimed in claim 3, wherein the prepared EMI shielding plastic particle has K value of 8.5 w/(m.k); a volume resistivity of less than 4.0 Ω cm; the shielding performance is 100dB under the condition that the electromagnetic noise signal is 500 MHz.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110605954.5A CN113248910A (en) | 2021-05-26 | 2021-05-26 | Electromagnetic shielding plastic particle |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110605954.5A CN113248910A (en) | 2021-05-26 | 2021-05-26 | Electromagnetic shielding plastic particle |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN113248910A true CN113248910A (en) | 2021-08-13 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202110605954.5A Pending CN113248910A (en) | 2021-05-26 | 2021-05-26 | Electromagnetic shielding plastic particle |
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Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101717577A (en) * | 2009-11-03 | 2010-06-02 | 苏州市科创聚合物有限公司 | Electromagnetic shielding nylon 66 material and preparation process thereof |
| WO2012026652A1 (en) * | 2010-08-26 | 2012-03-01 | 제일모직 주식회사 | High-rigidity electromagnetic shielding composition and molded articles thereof |
| CN102876033A (en) * | 2012-11-05 | 2013-01-16 | 科创聚合物(苏州)有限公司 | Process for producing electromagnetic polymer nylon 66 material |
| CN102985492A (en) * | 2010-08-26 | 2013-03-20 | 第一毛织株式会社 | High modulus composition for emi shielding and molded articles thereof |
| CN104231587A (en) * | 2014-08-27 | 2014-12-24 | 上海日之升新技术发展有限公司 | Thermoplastic composite material for electromagnetic shielding housings and preparation method thereof |
-
2021
- 2021-05-26 CN CN202110605954.5A patent/CN113248910A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101717577A (en) * | 2009-11-03 | 2010-06-02 | 苏州市科创聚合物有限公司 | Electromagnetic shielding nylon 66 material and preparation process thereof |
| WO2012026652A1 (en) * | 2010-08-26 | 2012-03-01 | 제일모직 주식회사 | High-rigidity electromagnetic shielding composition and molded articles thereof |
| CN102985492A (en) * | 2010-08-26 | 2013-03-20 | 第一毛织株式会社 | High modulus composition for emi shielding and molded articles thereof |
| CN102876033A (en) * | 2012-11-05 | 2013-01-16 | 科创聚合物(苏州)有限公司 | Process for producing electromagnetic polymer nylon 66 material |
| CN104231587A (en) * | 2014-08-27 | 2014-12-24 | 上海日之升新技术发展有限公司 | Thermoplastic composite material for electromagnetic shielding housings and preparation method thereof |
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Application publication date: 20210813 |