CN111635601A - Preparation method of cheap carbon-based electromagnetic shielding plate - Google Patents
Preparation method of cheap carbon-based electromagnetic shielding plate Download PDFInfo
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- CN111635601A CN111635601A CN202010599302.0A CN202010599302A CN111635601A CN 111635601 A CN111635601 A CN 111635601A CN 202010599302 A CN202010599302 A CN 202010599302A CN 111635601 A CN111635601 A CN 111635601A
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
- C08J5/00—Manufacture of articles or shaped materials containing macromolecular substances
- C08J5/18—Manufacture of films or sheets
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C43/00—Compression moulding, i.e. applying external pressure to flow the moulding material; Apparatus therefor
- B29C43/003—Compression moulding, i.e. applying external pressure to flow the moulding material; Apparatus therefor characterised by the choice of material
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C43/00—Compression moulding, i.e. applying external pressure to flow the moulding material; Apparatus therefor
- B29C43/02—Compression moulding, i.e. applying external pressure to flow the moulding material; Apparatus therefor of articles of definite length, i.e. discrete articles
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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
- H05K9/0083—Electromagnetic shielding materials, e.g. EMI, RFI shielding comprising electro-conductive non-fibrous particles embedded in an electrically insulating supporting structure, e.g. powder, flakes, whiskers
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29K—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES B29B, B29C OR B29D, RELATING TO MOULDING MATERIALS OR TO MATERIALS FOR MOULDS, REINFORCEMENTS, FILLERS OR PREFORMED PARTS, e.g. INSERTS
- B29K2507/00—Use of elements other than metals as filler
- B29K2507/04—Carbon
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
- C08J2323/00—Characterised by the use of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Derivatives of such polymers
- C08J2323/02—Characterised by the use of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Derivatives of such polymers not modified by chemical after treatment
- C08J2323/10—Homopolymers or copolymers of propene
- C08J2323/12—Polypropene
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
- C08J2327/00—Characterised by the use of homopolymers or copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and at least one being terminated by a halogen; Derivatives of such polymers
- C08J2327/02—Characterised by the use of homopolymers or copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and at least one being terminated by a halogen; Derivatives of such polymers not modified by chemical after-treatment
- C08J2327/04—Characterised by the use of homopolymers or copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and at least one being terminated by a halogen; Derivatives of such polymers not modified by chemical after-treatment containing chlorine atoms
- C08J2327/06—Homopolymers or copolymers of vinyl chloride
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- 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
- C08K3/04—Carbon
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- 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
- C08K7/00—Use of ingredients characterised by shape
- C08K7/22—Expanded, porous or hollow particles
- C08K7/24—Expanded, porous or hollow particles inorganic
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- 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
- C08K9/00—Use of pretreated ingredients
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- Engineering & Computer Science (AREA)
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- Manufacturing & Machinery (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Health & Medical Sciences (AREA)
- Materials Engineering (AREA)
- Medicinal Chemistry (AREA)
- Polymers & Plastics (AREA)
- Organic Chemistry (AREA)
- Physics & Mathematics (AREA)
- Electromagnetism (AREA)
- Microelectronics & Electronic Packaging (AREA)
- Shielding Devices Or Components To Electric Or Magnetic Fields (AREA)
- Carbon And Carbon Compounds (AREA)
Abstract
The invention discloses a preparation method of a cheap carbon-based electromagnetic shielding plate, which comprises the process steps of electricity generation carbon conductive treatment, electricity generation carbon compounding, electricity generation carbon resin mixture crushing, mechanical blending, mould pressing and the like. The plate comprises the following raw materials in parts by weight: 20-45% of resin, 1-5% of charcoal and 50-75% of power generation carbon powder. The power generation carbon powder is subjected to conductive treatment, and has conductive performance and electromagnetic shielding performance. The charcoal and the power generation carbon resin mixture are mechanically mixed and subjected to melting, hot pressing, air leakage, hot pressing and cold pressing to improve the conductivity of the plate and avoid uneven distribution and agglomeration of the charcoal. The invention effectively improves the utilization rate of the power generation carbon and realizes the green manufacture of the carbon plate with the electromagnetic shielding function.
Description
Technical Field
The invention relates to the technical field of biomass energy and materials, in particular to a preparation method of a cheap carbon-based electromagnetic shielding plate.
Background
China is a big country of bamboo industry, and bamboo resources are abundant to prepare bamboo charcoal and bamboo charcoal composite materials. The bamboo charcoal has the functions of emitting far infrared rays, releasing negative ions, adsorbing formaldehyde, shielding electromagnetic waves and the like, so that the bamboo charcoal composite material is widely applied to furniture decoration. The traditional bamboo charcoal is made by firing in an earth kiln or a mechanical kiln, the bamboo charcoal fired in the earth kiln has certain conductivity, but the bamboo charcoal produced in the earth kiln causes great pollution to the environment, and in recent years, the number of bamboo charcoal enterprises in the earth kiln is gradually reduced; the pollution of the mechanical kiln is lower than that of an earth kiln, but the produced bamboo charcoal has low firing temperature and cannot conduct electricity. In order to comprehensively utilize energy, bamboo wood is applied to power generation in recent years, and poly-generation of 'gas-electricity-carbon' can be realized. After the bamboo is applied to power generation, the energy is fully utilized, the generated power generation carbon has high ash content and low fixed carbon, and meanwhile, the power generation carbon can not reach the fixed carbon and ash content required by the qualified bamboo charcoal of the national standard, so the price is low. Because the quality of power generation is poor and the power generation is difficult to be used as fuel or activated carbon, how to utilize the power generation carbon is a big problem of biomass poly-generation.
With the rapid development of electronic information and communication technology, electronic devices are widely used in life, and in recent years, problems of information leakage and electromagnetic interference are becoming more serious, so that it is very important to take relevant measures to shield electromagnetic waves and protect information.
The conductive composite board can well shield electromagnetic waves, but the carbon conductive materials such as graphene, carbon nanotubes and carbon fibers adopted at present are expensive, and industrial production is difficult to realize.
Therefore, in view of the above situation, there is an urgent need to develop a method for preparing a cheap carbon-based electromagnetic shielding plate, so as to overcome the disadvantages in the current practical application.
Disclosure of Invention
The invention aims to provide a method for preparing a cheap carbon-based electromagnetic shielding plate, so as to solve the problems in the background technology.
In order to achieve the purpose, the invention provides the following technical scheme:
a cheap carbon-based electromagnetic shielding plate comprises the following raw materials in parts by weight: 20-45% of resin, 1-5% of charcoal and 50-75% of power generation carbon.
As a further scheme of the invention: the charcoal is high-temperature powdered charcoal fired by an earth kiln process.
As a further scheme of the invention: the resin is at least one of polyethylene, polypropylene, ultra-high molecular weight polyethylene, polylactic acid, acrylonitrile-butadiene-styrene and polyvinyl chloride.
As a further scheme of the invention: the power generation carbon is subjected to conductive modification treatment.
A preparation method of a cheap carbon-based electromagnetic shielding plate specifically comprises the following steps:
s1, conducting treatment by using power generation carbon: screening 200-mesh 400-mesh power generation carbon by using an electromagnetic vibration screening machine, placing the power generation carbon in a crucible and covering the crucible cover, and then carrying out oxygen separation calcination in an integrated box-type high-temperature electric furnace at the temperature rise rate of 5-20 ℃/min and the calcination temperature of 950-mesh 1550 ℃ for 1-3h at constant temperature;
s2, power generation and carbon compounding: compounding power generation carbon powder and resin in a mixing roll to obtain a power generation carbon resin mixture;
s3, crushing the electricity generation carbon resin mixture: crushing the power generation carbon resin mixture obtained in the step S2 to 10-30 meshes;
s4, mechanical blending: placing the 10-30 mesh bamboo charcoal resin mixture obtained in the step S3 and charcoal in a high-speed stirrer for dry mixing for 1-3 min to obtain a mould pressing material;
s5, die pressing: the density of the general molded plate is 0.7-1g/cm3, the molded material prepared in the step S4 is weighed according to the set molded density and the volume of the mold, and after the material is paved, the hot press is used for warm pressing.
As a further scheme of the invention: in step S5, the warm pressing process to avoid uneven distribution and agglomeration of charcoal is as follows: when the temperature is increased to 150-; taking out the plate, cold pressing for 5-10min, and increasing the pressure to 3-10 MPa.
Compared with the prior art, the invention has the beneficial effects that:
the cheap power generation carbon is used as the main body of the electromagnetic shielding plate, so that the cost of the material is greatly reduced, and the conductivity and the electromagnetic shielding performance of the carbon plate are improved through simple conductive treatment of the power generation carbon. The power generation carbon cannot conduct electricity, but after high-temperature calcination, volatile matters are decomposed, the content of fixed carbon is greatly improved, the microstructure of the bamboo charcoal is further shrunk and a similar graphitized structure appears, the conductivity is improved, and the aperture and the specific surface area of the carbon are correspondingly improved. After the power generation carbon with 200-400 meshes is selected for conducting treatment, the conducting performance is easier to enhance, and the power generation carbon is easier to disperse after being compounded with resin. The conductive treatment not only enhances the conductive performance of the carbon, but also is beneficial to the resin to flow into the carbon holes, and improves the mechanical performance of the plate. The power generation carbon resin mixture is crushed and mechanically mixed with the charcoal powder, and the charcoal is uniformly coated on the surface of the power generation carbon resin mixture, so that the charcoal is not completely coated by the resin after hot pressing, and a conductive network structure is generated in a power generation carbon plate, so that the electromagnetic shielding performance of the plate is further improved. The uneven distribution and agglomeration of the board charcoal are avoided through the warm pressing process of melting, hot pressing, air leakage, hot pressing and cold pressing. Compared with other biomass carbon plates, the plate material provided by the invention has low raw material cost, and the bending strength and the electromagnetic shielding effectiveness are obviously higher than those of other biomass carbon plates.
Detailed Description
The technical solutions in the embodiments of the present invention are clearly and completely described below, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Example 1: a cheap carbon-based electromagnetic shielding plate comprises the following raw materials in parts by weight: 40% of resin, 1% of charcoal and 59% of electricity generation charcoal.
The charcoal is high-temperature powdered charcoal fired by an earth kiln process.
The resin is polyvinyl chloride.
A preparation method of a cheap carbon-based electromagnetic shielding plate specifically comprises the following steps:
s1, conducting treatment by using power generation carbon: firstly, screening 200-mesh power generation carbon by using an electromagnetic vibration screening machine, placing the power generation carbon in a crucible, covering the crucible with a crucible cover, and then carrying out oxygen isolation calcination in an integrated box-type high-temperature electric furnace, wherein the heating rate is 7 ℃/min, the calcination temperature is 1350 ℃, and the calcination constant temperature time is 2 hours;
s2, power generation and carbon compounding: compounding power generation carbon powder and resin in a mixing roll to obtain a power generation carbon resin mixture;
s3, crushing the electricity generation carbon resin mixture: crushing the power generation carbon resin mixture obtained in the step S2 to 10-30 meshes;
s4, mechanical blending: placing the 10-30 mesh bamboo charcoal resin mixture obtained in the step S3 and charcoal in a high-speed stirrer for dry mixing for 3min to obtain a mould pressing material;
s5, die pressing: the density of the general molded plate is 0.8 g/cm3, a certain mass of the molded material prepared in the step S4 is weighed according to the set molded density and the volume of the mold, and after the material is paved, the hot press is used for warm pressing.
As a further scheme of the invention: in step S5, the warm pressing process to avoid uneven distribution and agglomeration of charcoal is as follows: when the temperature is raised to 150 ℃, the mould pressing material is firstly hot melted for 5min, then the pressure is raised to 3MPa, the pressure is maintained for 2min, then the pressure is released and the air is discharged, the pressure is raised to 10MPa again, the pressure is maintained for 10min, then the heating is stopped, and the pressure is released; taking out the plate, cold pressing for 5min, and increasing the pressure to 10 MPa.
Example 2: a cheap carbon-based electromagnetic shielding plate comprises the following raw materials in parts by weight: 35% of resin, 3% of charcoal and 62% of power generation carbon.
The charcoal is high-temperature powdered charcoal fired by an earth kiln process.
The resin is polypropylene.
A preparation method of a cheap carbon-based electromagnetic shielding plate specifically comprises the following steps:
s1, conducting treatment by using power generation carbon: screening 300 meshes of power generation carbon by using an electromagnetic vibration screening machine, placing the power generation carbon in a crucible, covering the crucible with a crucible cover, and then carrying out oxygen isolation calcination in an integrated box-type high-temperature electric furnace, wherein the heating rate is 15 ℃/min, the calcination temperature is 1500 ℃, and the calcination constant temperature time is 1 h;
s2, power generation and carbon compounding: compounding power generation carbon powder and resin in a mixing roll to obtain a power generation carbon resin mixture;
s3, crushing the electricity generation carbon resin mixture: crushing the power generation carbon resin mixture obtained in the step S2 to 10-30 meshes;
s4, mechanical blending: placing the 10-30 mesh bamboo charcoal resin mixture obtained in the step S3 and charcoal in a high-speed stirrer for dry mixing for 3min to obtain a mould pressing material;
s5, die pressing: the density of the general molded plate is 1g/cm3, a certain mass of the molded material prepared in the step S4 is weighed according to the set molded density and the volume of the mold, and after the material is paved, the hot press is used for warm pressing.
As a further scheme of the invention: in step S5, the warm pressing process to avoid uneven distribution and agglomeration of charcoal is as follows: when the temperature is raised to 170 ℃, the mould pressing material is firstly hot melted for 5min, then the pressure is raised to 8MPa, the pressure is maintained for 3min, then the pressure is released and the air is discharged, the pressure is raised to 10MPa again, the pressure is maintained for 12min, then the heating is stopped, and the pressure is released; taking out the plate, cold pressing for 8min, and increasing the pressure to 8 MPa.
The electromagnetic shielding effectiveness of the embodiment 1 reaches 59 dB, and the bending strength reaches 45 MPa.
The electromagnetic shielding effectiveness of the embodiment 2 reaches 65 dB, and the bending strength reaches 41 MPa.
Compared with other biomass carbon plates, the plate material provided by the invention has low raw material cost, and the bending strength and the electromagnetic shielding effectiveness are obviously higher than those of other biomass carbon plates.
The above is only a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, it is possible to make several variations and modifications without departing from the concept of the present invention, and these should be considered as the protection scope of the present invention, which will not affect the effect of the implementation of the present invention and the utility of the patent.
Claims (4)
1. A cheap carbon-based electromagnetic shielding plate preparation method is characterized by comprising the steps of electricity generation carbon conductive treatment, electricity generation carbon compounding, electricity generation carbon resin mixture crushing, mechanical blending and mould pressing;
the method specifically comprises the following steps:
s1, conducting treatment by using power generation carbon: screening 200-mesh 400-mesh power generation carbon by using an electromagnetic vibration screening machine, placing the power generation carbon in a crucible and covering the crucible cover, and then carrying out oxygen separation calcination in an integrated box-type high-temperature electric furnace at the temperature rise rate of 5-20 ℃/min and the calcination temperature of 950-mesh 1550 ℃ for 1-3h at constant temperature;
s2, power generation and carbon compounding: compounding power generation carbon powder and resin in a mixing roll to obtain a power generation carbon resin mixture;
s3, crushing the electricity generation carbon resin mixture: crushing the power generation carbon resin mixture obtained in the step S2 to 10-30 meshes;
s4, mechanical blending: placing the 10-30 mesh bamboo charcoal resin mixture obtained in the step S3 and charcoal in a high-speed stirrer for dry mixing for 1-3 min to obtain a mould pressing material;
s5, die pressing: the density of a general die pressing plate is 0.7-1g/cm3, a certain mass of die pressing materials prepared in the step S4 are weighed according to the set die pressing density and the volume of a die, and after the materials are paved, a hot press is used for warm pressing;
in step S5, the warm pressing process to avoid uneven distribution and agglomeration of charcoal is as follows: when the temperature is increased to 150-; taking out the plate, cold pressing for 5-10min, and increasing the pressure to 3-10 MPa.
2. The method for preparing a cheap carbon-based electromagnetic shielding plate as claimed in claim 1, which is characterized by comprising the following raw materials in parts by weight: 20-45% of resin, 1-5% of charcoal and 50-75% of power generation carbon.
3. The method of claim 2, wherein the charcoal is high-temperature powdered charcoal fired by an earth kiln process.
4. The method as claimed in claim 2, wherein the resin is at least one of polyethylene, polypropylene, ultra-high molecular weight polyethylene, polylactic acid, acrylonitrile butadiene styrene, and polyvinyl chloride.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202010599302.0A CN111635601A (en) | 2020-06-28 | 2020-06-28 | Preparation method of cheap carbon-based electromagnetic shielding plate |
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| CN202010599302.0A CN111635601A (en) | 2020-06-28 | 2020-06-28 | Preparation method of cheap carbon-based electromagnetic shielding plate |
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Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1485400A (en) * | 2002-09-29 | 2004-03-31 | 娟 周 | Process for preparing electric bamboo charcoal |
| JP2005035806A (en) * | 2003-07-15 | 2005-02-10 | Kyogyo Kumiai Hachiman Kawara Seisakusho | Conductive wood and bamboo charcoal and method of manufacturing conductive wood and bamboo charcoal |
| CN102107866A (en) * | 2010-12-15 | 2011-06-29 | 中国林业科学研究院木材工业研究所 | Method for preparing wood conductive carbon powder through high-temperature carbonization |
| CN103265025A (en) * | 2013-04-17 | 2013-08-28 | 浙江大学 | Method for preparing biomass conductive charcoal electromagnetic shielding material |
| CN108794812A (en) * | 2018-06-25 | 2018-11-13 | 厦门中科城环新能源有限公司 | A kind of electromagnetic shielding material and its preparation method and application |
-
2020
- 2020-06-28 CN CN202010599302.0A patent/CN111635601A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1485400A (en) * | 2002-09-29 | 2004-03-31 | 娟 周 | Process for preparing electric bamboo charcoal |
| JP2005035806A (en) * | 2003-07-15 | 2005-02-10 | Kyogyo Kumiai Hachiman Kawara Seisakusho | Conductive wood and bamboo charcoal and method of manufacturing conductive wood and bamboo charcoal |
| CN102107866A (en) * | 2010-12-15 | 2011-06-29 | 中国林业科学研究院木材工业研究所 | Method for preparing wood conductive carbon powder through high-temperature carbonization |
| CN103265025A (en) * | 2013-04-17 | 2013-08-28 | 浙江大学 | Method for preparing biomass conductive charcoal electromagnetic shielding material |
| CN108794812A (en) * | 2018-06-25 | 2018-11-13 | 厦门中科城环新能源有限公司 | A kind of electromagnetic shielding material and its preparation method and application |
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