CN113912934A - Hollow thin-wall tubular bead foamed polymer wave-absorbing material and preparation method thereof - Google Patents
Hollow thin-wall tubular bead foamed polymer wave-absorbing material and preparation method thereof Download PDFInfo
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- C08J9/00—Working-up of macromolecular substances to porous or cellular articles or materials; After-treatment thereof
- C08J9/22—After-treatment of expandable particles; Forming foamed products
- C08J9/228—Forming foamed products
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- C08J9/00—Working-up of macromolecular substances to porous or cellular articles or materials; After-treatment thereof
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- C08J9/00—Working-up of macromolecular substances to porous or cellular articles or materials; After-treatment thereof
- C08J9/16—Making expandable particles
- C08J9/18—Making expandable particles by impregnating polymer particles with the blowing agent
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- 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
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- 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
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- C08J2300/14—Water soluble or water swellable polymers, e.g. aqueous gels
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- 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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Abstract
The invention relates to the technical field of preparation of foamed polymer wave-absorbing materials, in particular to a hollow thin-wall tubular bead foamed polymer wave-absorbing material and a preparation method thereof, the hollow thin-wall tubular bead foamed polymer wave-absorbing material is composed of polypropylene, water-soluble polymer, electromagnetic wave absorbent and other auxiliary agents, and the specific weight of each component is as follows: 25-70% of polypropylene, 25-70% of water-soluble polymer, 5-20% of electromagnetic wave absorbent and 5-35% of other auxiliary agents, wherein the other auxiliary agents comprise a stabilizer, an antioxidant, an ultraviolet absorbent, a flame retardant and a lubricant. According to the invention, by designing the hollow structure, the wave-absorbing material prepared from the foaming polymer can effectively increase the reflection and absorption times of electromagnetic waves, so that the functionality of the wave-absorbing material is greatly improved, the requirements of customers can be met, the light-weight material design is realized, and the use of the wave-absorbing material is convenient.
Description
Technical Field
The invention relates to the technical field of preparation of foamed polymer wave-absorbing materials, in particular to a hollow thin-wall tubular bead foamed polymer wave-absorbing material and a preparation method thereof.
Background
The wave-absorbing material is a material capable of absorbing or greatly reducing the electromagnetic wave energy received by the surface of the wave-absorbing material so as to reduce the interference of the electromagnetic wave, and is widely applied to the manufacturing aspects of electronics, electrical equipment and precision instruments.
The wave-absorbing material on the market at present mainly comprises a sponge wave-absorbing body and a polystyrene wave-absorbing material, wherein the sponge wave-absorbing body absorbs a wave-absorbing agent by utilizing the porous property of sponge, and the defects that the wave-absorbing agent is easy to fall off, the product weight is large, the strength of the whole material of the polystyrene wave-absorbing material is not enough, the material is easily subjected to brittle fracture due to accidental collision in the installation process, the whole functionality of the whole wave-absorbing material is poor, and the market demand can not be better met.
Disclosure of Invention
The invention aims to solve the defects in the prior art and provides a hollow thin-wall tubular bead foaming polymer wave-absorbing material and a preparation method thereof.
In order to achieve the purpose, the invention adopts the following technical scheme: the hollow thin-wall tubular bead foaming polymer wave-absorbing material is composed of polypropylene, a water-soluble polymer, an electromagnetic wave absorbent and other auxiliaries, and the specific weight of each component is as follows: 25-70% of polypropylene, 25-70% of water-soluble polymer, 5-20% of electromagnetic wave absorbent and 5-35% of other auxiliary agents.
Preferably, the method comprises the following steps:
s1: melt coextrusion: quantitatively feeding polypropylene, an electromagnetic wave absorbent and other auxiliaries into a screw extruder to serve as an extrusion outer layer, wherein a water-soluble polymer is selected as an inner layer;
s2: pelletizing: the strand is processed in step S1 and then cut into particles by a granulator;
s3: physical foaming: putting the particles into a foaming reaction kettle, wherein a dispersing medium in the reaction kettle can disperse the particles, setting a certain temperature and gas pressure, dissolving a water-soluble polymer in the particles in water in a gas saturation stage, and opening a valve of the reaction kettle to instantaneously release pressure after the foaming temperature and the foaming pressure reach the set values to obtain hollow thin-wall tubular foamed polypropylene beads with controllable multiplying power;
s4: molding: the hollow tubular thin-walled foamed polypropylene obtained in S3 was used as a molding material to mold an electromagnetic wave foam absorber of a desired structure.
Preferably, the other auxiliary agents include stabilizers, antioxidants, ultraviolet absorbers, flame retardants and lubricants.
Preferably, the electromagnetic wave absorbent is made of one or a combination of more of conductive carbon black, carbon nanotubes, graphene, carbon fibers, conductive titanium dioxide, conductive mica powder, conductive silver powder, conductive nickel powder and conductive glass powder.
Preferably, the tubular expanded polypropylene beads in S2 have a single length of 0.5-5mm and a weight of 0.5-5 mg.
Preferably, the material of the dispersion medium in S3 is silicon dioxide.
Preferably, the electromagnetic wave foam absorber in S4 is molded by a steam mold.
Compared with the prior art, the invention has the advantages and positive effects that:
according to the invention, by designing the hollow structure, the wave-absorbing material prepared from the foaming polymer can effectively increase the reflection and absorption times of electromagnetic waves, so that the functionality of the wave-absorbing material is greatly improved, the requirements of customers can be met, the light-weight material design is realized, and the wave-absorbing material is convenient to use.
Drawings
FIG. 1 is a flow chart of the preparation method of a hollow thin-wall tubular bead foaming polymer wave-absorbing material provided by the invention;
FIG. 2 is a 12GHz-18GHz wave-absorbing performance diagram of the hollow thin-wall tubular bead foamed polymer wave-absorbing material provided by the invention;
FIG. 3 is a 100kHz-1GHz wave-absorbing performance diagram of the hollow thin-wall tubular bead foaming polymer wave-absorbing material provided by the invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is described in further detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
In the description of the present invention, it is to be understood that the terms "length", "width", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", and the like, indicate orientations or positional relationships based on those shown in the drawings, and are used only for convenience in describing the present invention and for simplicity in description, and do not indicate or imply that the devices or elements referred to must have a particular orientation, be constructed in a particular orientation, and be operated, and thus, are not to be construed as limiting the present invention. Further, in the description of the present invention, "a plurality" means two or more unless specifically defined otherwise.
Referring to fig. 1-3, the present invention provides a technical solution: a hollow thin-wall tubular bead foaming polymer wave-absorbing material is composed of polypropylene, a water-soluble polymer, an electromagnetic wave absorbent and other auxiliary agents, and the specific gravity of each component is as follows: 25-70% of polypropylene, 25-70% of water-soluble polymer, 5-20% of electromagnetic wave absorbent and 5-35% of other additives, wherein the other additives comprise a stabilizer, an antioxidant, an ultraviolet absorbent, a flame retardant and a lubricant, and the electromagnetic wave absorbent is prepared from one or more of conductive carbon black, carbon nano tubes, graphene, carbon fibers, conductive titanium dioxide, conductive mica powder, conductive silver powder, conductive nickel powder and conductive glass powder.
The method comprises the following steps:
s1: melt coextrusion: quantitatively feeding polypropylene, an electromagnetic wave absorbent and other auxiliaries into a screw extruder to serve as an extrusion outer layer, wherein a water-soluble polymer is selected as an inner layer;
s2: pelletizing: the strand silk is processed by the step S1, and then is cut into particles by a granulator, the length of each single particle of the tubular expanded polypropylene bead is 0.5-5mm, and the weight of each single particle of the tubular expanded polypropylene bead is 0.5-5 mg;
s3: physical foaming: putting the particles into a foaming reaction kettle, dispersing the particles by a dispersion medium in the reaction kettle, setting a certain temperature and gas pressure, dissolving a water-soluble polymer in the particles in water in a gas saturation stage, and opening a valve of the reaction kettle to instantaneously release pressure after the foaming temperature and the foaming pressure reach the set values to obtain hollow thin-wall tubular foamed polypropylene beads with controllable multiplying power, wherein the dispersion medium is made of silicon dioxide;
s4: molding: the hollow tubular thin-walled foamed polypropylene obtained in S3 was used as a molding material, and an electromagnetic wave foam absorber having a desired structure was molded by a steam mold.
The first embodiment is as follows: referring to fig. 1, the hollow thin-wall tubular bead foaming polymer wave-absorbing material is composed of polypropylene, a water-soluble polymer, an electromagnetic wave absorbent and other additives, and the specific gravity of each component is as follows: 25% of polypropylene, 35% of water-soluble polymer, 20% of electromagnetic wave absorbent and 20% of other additives.
The method comprises the following steps:
s1: melt coextrusion: quantitatively feeding polypropylene, an electromagnetic wave absorbent and other auxiliaries into a screw extruder to serve as an extrusion outer layer, wherein a water-soluble polymer is selected as an inner layer;
s2: pelletizing: the strand silk is processed by the step S1, and then is cut into particles by a granulator, the length of each single particle of the tubular expanded polypropylene bead is 0.5-5mm, and the weight of each single particle of the tubular expanded polypropylene bead is 0.5-5 mg;
s3: physical foaming: putting the particles into a foaming reaction kettle, dispersing the particles by a dispersion medium in the reaction kettle, setting a certain temperature and gas pressure, dissolving a water-soluble polymer in the particles in water in a gas saturation stage, and opening a valve of the reaction kettle to instantaneously release pressure after the foaming temperature and the foaming pressure reach the set values to obtain hollow thin-wall tubular foamed polypropylene beads with controllable multiplying power, wherein the dispersion medium is made of silicon dioxide;
s4: molding: the hollow tubular thin-walled foamed polypropylene obtained in S3 was used as a molding material, and an electromagnetic wave foam absorber having a desired structure was molded by a steam mold.
Example two: referring to fig. 1, the hollow thin-wall tubular bead foaming polymer wave-absorbing material is composed of polypropylene, a water-soluble polymer, an electromagnetic wave absorbent and other additives, and the specific gravity of each component is as follows: the weight percentage of the polypropylene is 40%, the weight percentage of the water-soluble polymer is 40%, the weight percentage of the electromagnetic wave absorbent is 10%, and the weight percentage of other auxiliary agents is 10%.
The method comprises the following steps:
s1: melt coextrusion: quantitatively feeding polypropylene, an electromagnetic wave absorbent and other auxiliaries into a screw extruder to serve as an extrusion outer layer, wherein a water-soluble polymer is selected as an inner layer;
s2: pelletizing: the strand silk is processed by the step S1, and then is cut into particles by a granulator, the length of each single particle of the tubular expanded polypropylene bead is 0.5-5mm, and the weight of each single particle of the tubular expanded polypropylene bead is 0.5-5 mg;
s3: physical foaming: putting the particles into a foaming reaction kettle, dispersing the particles by a dispersion medium in the reaction kettle, setting a certain temperature and gas pressure, dissolving a water-soluble polymer in the particles in water in a gas saturation stage, and opening a valve of the reaction kettle to instantaneously release pressure after the foaming temperature and the foaming pressure reach the set values to obtain hollow thin-wall tubular foamed polypropylene beads with controllable multiplying power, wherein the dispersion medium is made of silicon dioxide;
s4: molding: the hollow tubular thin-walled foamed polypropylene obtained in S3 was used as a molding material, and an electromagnetic wave foam absorber having a desired structure was molded by a steam mold.
Example three: referring to fig. 1, the hollow thin-wall tubular bead foaming polymer wave-absorbing material is composed of polypropylene, a water-soluble polymer, an electromagnetic wave absorbent and other additives, and the specific gravity of each component is as follows: the weight percentage of the polypropylene is 60%, the weight percentage of the water-soluble polymer is 30%, the weight percentage of the electromagnetic wave absorbent is 5%, and the weight percentage of other auxiliary agents is 5%.
The method comprises the following steps:
s1: melt coextrusion: quantitatively feeding polypropylene, an electromagnetic wave absorbent and other auxiliaries into a screw extruder to serve as an extrusion outer layer, wherein a water-soluble polymer is selected as an inner layer;
s2: pelletizing: the strand silk is processed by the step S1, and then is cut into particles by a granulator, the length of each single particle of the tubular expanded polypropylene bead is 0.5-5mm, and the weight of each single particle of the tubular expanded polypropylene bead is 0.5-5 mg;
s3: physical foaming: putting the particles into a foaming reaction kettle, dispersing the particles by a dispersion medium in the reaction kettle, setting a certain temperature and gas pressure, dissolving a water-soluble polymer in the particles in water in a gas saturation stage, and opening a valve of the reaction kettle to instantaneously release pressure after the foaming temperature and the foaming pressure reach the set values to obtain hollow thin-wall tubular foamed polypropylene beads with controllable multiplying power, wherein the dispersion medium is made of silicon dioxide;
s4: molding: the hollow tubular thin-walled foamed polypropylene obtained in S3 was used as a molding material, and an electromagnetic wave foam absorber having a desired structure was molded by a steam mold.
The first embodiment is as follows: referring to fig. 1, the hollow thin-wall tubular bead foaming polymer wave-absorbing material is composed of polypropylene, a water-soluble polymer, an electromagnetic wave absorbent and other additives, and the specific gravity of each component is as follows: the weight percentage of the polypropylene is 22 percent, the weight percentage of the water-soluble polymer is 23 percent, the weight percentage of the electromagnetic wave absorbent is 20 percent, and the weight percentage of other auxiliary agents is 35 percent.
The method comprises the following steps:
s1: melt coextrusion: quantitatively feeding polypropylene, an electromagnetic wave absorbent and other auxiliaries into a screw extruder to serve as an extrusion outer layer, wherein a water-soluble polymer is selected as an inner layer;
s2: pelletizing: the strand silk is processed by the step S1, and then is cut into particles by a granulator, the length of each single particle of the tubular expanded polypropylene bead is 0.5-5mm, and the weight of each single particle of the tubular expanded polypropylene bead is 0.5-5 mg;
s3: physical foaming: putting the particles into a foaming reaction kettle, dispersing the particles by a dispersion medium in the reaction kettle, setting a certain temperature and gas pressure, dissolving a water-soluble polymer in the particles in water in a gas saturation stage, and opening a valve of the reaction kettle to instantaneously release pressure after the foaming temperature and the foaming pressure reach the set values to obtain hollow thin-wall tubular foamed polypropylene beads with controllable multiplying power, wherein the dispersion medium is made of silicon dioxide;
s4: molding: the hollow tubular thin-walled foamed polypropylene obtained in S3 was used as a molding material, and an electromagnetic wave foam absorber having a desired structure was molded by a steam mold.
The working principle is as follows: the preparation method comprises the steps of preparing cylindrical particles with a skin-core structure by melting, co-extruding and granulating polypropylene and water-soluble polymers, wherein the core layer is the water-soluble polymers and can be dissolved in a subsequent foaming reaction kettle, the residual skin layer is a polypropylene supporting layer, after the particles are discharged from the foaming reaction kettle, polypropylene foam beads with controllable multiplying power can be obtained, and finally, forming the electromagnetic wave absorber with the required structural shape through a steam mold.
Although the present invention has been described with reference to specific embodiments, it will be understood by those skilled in the art that various changes and modifications may be made without departing from the spirit and scope of the invention.
Claims (7)
1. A hollow thin-wall tubular bead foaming polymer wave-absorbing material is characterized in that: the hollow thin-wall tubular bead foaming polymer wave-absorbing material is composed of polypropylene, a water-soluble polymer, an electromagnetic wave absorbent and other auxiliary agents, and the specific weight of each component is as follows: 25-70% of polypropylene, 25-70% of water-soluble polymer, 5-20% of electromagnetic wave absorbent and 5-35% of other auxiliary agents.
2. The preparation method of the hollow thin-wall tubular bead foaming polymer wave-absorbing material according to claim 1, characterized in that: the method comprises the following steps:
s1: melt coextrusion: quantitatively feeding polypropylene, an electromagnetic wave absorbent and other auxiliaries into a screw extruder to serve as an extrusion outer layer, wherein a water-soluble polymer is selected as an inner layer;
s2: pelletizing: the strand is processed in step S1 and then cut into particles by a granulator;
s3: physical foaming: putting the particles into a foaming reaction kettle, wherein a dispersing medium in the reaction kettle can disperse the particles, setting a certain temperature and gas pressure, dissolving a water-soluble polymer in the particles in water in a gas saturation stage, and opening a valve of the reaction kettle to instantaneously release pressure after the foaming temperature and the foaming pressure reach the set values to obtain hollow thin-wall tubular foamed polypropylene beads with controllable multiplying power;
s4: molding: the hollow tubular thin-walled foamed polypropylene obtained in S3 was used as a molding material to mold an electromagnetic wave foam absorber of a desired structure.
3. The hollow thin-wall tubular bead foamed polymer wave-absorbing material of claim 1, wherein: the other auxiliary agents include stabilizers, antioxidants, ultraviolet absorbers, flame retardants and lubricants.
4. The hollow thin-wall tubular bead foamed polymer wave-absorbing material of claim 1, wherein: the electromagnetic wave absorbent is prepared by one or more of conductive carbon black, carbon nano tubes, graphene, carbon fibers, conductive titanium dioxide, conductive mica powder, conductive silver powder, conductive nickel powder and conductive glass powder.
5. The preparation method of the hollow thin-wall tubular bead foaming polymer wave-absorbing material according to claim 2, characterized in that: the length of each tubular expanded polypropylene bead in the S2 is 0.5-5mm, and the weight is 0.5-5 mg.
6. The preparation method of the hollow thin-wall tubular bead foaming polymer wave-absorbing material according to claim 2, characterized in that: the material of the dispersion medium in the step S3 is silicon dioxide.
7. The preparation method of the hollow thin-wall tubular bead foaming polymer wave-absorbing material according to claim 2, characterized in that: the electromagnetic wave foam absorber in S4 is molded by a steam mold.
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114633528A (en) * | 2022-03-22 | 2022-06-17 | 江苏万华拓谷新材料科技有限公司 | Composite material with wave-absorbing and electromagnetic shielding properties and preparation method thereof |
| CN117089142A (en) * | 2023-09-19 | 2023-11-21 | 亿策科技有限公司 | Wave absorber with internal through holes, preparation method and extrusion foaming processing line |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106317447A (en) * | 2016-08-19 | 2017-01-11 | 深圳唯创微波技术有限公司 | Fire-retardant polypropylene foam wave absorbing composite material and method for preparing same |
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2021
- 2021-09-10 CN CN202111060629.1A patent/CN113912934A/en active Pending
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106317447A (en) * | 2016-08-19 | 2017-01-11 | 深圳唯创微波技术有限公司 | Fire-retardant polypropylene foam wave absorbing composite material and method for preparing same |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114633528A (en) * | 2022-03-22 | 2022-06-17 | 江苏万华拓谷新材料科技有限公司 | Composite material with wave-absorbing and electromagnetic shielding properties and preparation method thereof |
| CN117089142A (en) * | 2023-09-19 | 2023-11-21 | 亿策科技有限公司 | Wave absorber with internal through holes, preparation method and extrusion foaming processing line |
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