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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- CN113912934A CN113912934A CN202111060629.1A CN202111060629A CN113912934A CN 113912934 A CN113912934 A CN 113912934A CN 202111060629 A CN202111060629 A CN 202111060629A CN 113912934 A CN113912934 A CN 113912934A
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- 239000011324 bead Substances 0.000 title claims abstract description 43
- 239000011358 absorbing material Substances 0.000 title claims abstract description 37
- 229920000642 polymer Polymers 0.000 title claims abstract description 27
- 238000002360 preparation method Methods 0.000 title claims abstract description 13
- 239000004743 Polypropylene Substances 0.000 claims abstract description 52
- -1 polypropylene Polymers 0.000 claims abstract description 52
- 229920001155 polypropylene Polymers 0.000 claims abstract description 52
- 238000005187 foaming Methods 0.000 claims abstract description 47
- 229920003169 water-soluble polymer Polymers 0.000 claims abstract description 32
- 230000002745 absorbent Effects 0.000 claims abstract description 28
- 239000002250 absorbent Substances 0.000 claims abstract description 28
- 239000012752 auxiliary agent Substances 0.000 claims abstract description 12
- 239000003963 antioxidant agent Substances 0.000 claims abstract description 4
- 239000003063 flame retardant Substances 0.000 claims abstract description 4
- 239000000314 lubricant Substances 0.000 claims abstract description 4
- 239000003381 stabilizer Substances 0.000 claims abstract description 4
- 239000002245 particle Substances 0.000 claims description 40
- 238000006243 chemical reaction Methods 0.000 claims description 23
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 claims description 14
- 239000006096 absorbing agent Substances 0.000 claims description 14
- 239000002612 dispersion medium Substances 0.000 claims description 12
- 239000006260 foam Substances 0.000 claims description 10
- 238000001125 extrusion Methods 0.000 claims description 7
- 238000000034 method Methods 0.000 claims description 7
- 239000012778 molding material Substances 0.000 claims description 7
- 238000000465 moulding Methods 0.000 claims description 7
- 238000005453 pelletization Methods 0.000 claims description 7
- 235000012239 silicon dioxide Nutrition 0.000 claims description 7
- 239000000377 silicon dioxide Substances 0.000 claims description 7
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 7
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims description 6
- GWEVSGVZZGPLCZ-UHFFFAOYSA-N Titan oxide Chemical compound O=[Ti]=O GWEVSGVZZGPLCZ-UHFFFAOYSA-N 0.000 claims description 6
- 239000000843 powder Substances 0.000 claims description 6
- 239000000463 material Substances 0.000 claims description 5
- 229920000049 Carbon (fiber) Polymers 0.000 claims description 3
- PXHVJJICTQNCMI-UHFFFAOYSA-N Nickel Chemical compound [Ni] PXHVJJICTQNCMI-UHFFFAOYSA-N 0.000 claims description 3
- BQCADISMDOOEFD-UHFFFAOYSA-N Silver Chemical compound [Ag] BQCADISMDOOEFD-UHFFFAOYSA-N 0.000 claims description 3
- 239000004917 carbon fiber Substances 0.000 claims description 3
- 229910021393 carbon nanotube Inorganic materials 0.000 claims description 3
- 239000002041 carbon nanotube Substances 0.000 claims description 3
- 239000011521 glass Substances 0.000 claims description 3
- 229910021389 graphene Inorganic materials 0.000 claims description 3
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 claims description 3
- 239000010445 mica Substances 0.000 claims description 3
- 229910052618 mica group Inorganic materials 0.000 claims description 3
- 239000004408 titanium dioxide Substances 0.000 claims description 3
- 239000002609 medium Substances 0.000 claims description 2
- RNFJDJUURJAICM-UHFFFAOYSA-N 2,2,4,4,6,6-hexaphenoxy-1,3,5-triaza-2$l^{5},4$l^{5},6$l^{5}-triphosphacyclohexa-1,3,5-triene Chemical compound N=1P(OC=2C=CC=CC=2)(OC=2C=CC=CC=2)=NP(OC=2C=CC=CC=2)(OC=2C=CC=CC=2)=NP=1(OC=1C=CC=CC=1)OC1=CC=CC=C1 RNFJDJUURJAICM-UHFFFAOYSA-N 0.000 abstract description 2
- 238000010521 absorption reaction Methods 0.000 abstract description 2
- 230000003078 antioxidant effect Effects 0.000 abstract description 2
- 239000003562 lightweight material Substances 0.000 abstract description 2
- 239000010410 layer Substances 0.000 description 14
- 239000000654 additive Substances 0.000 description 7
- 230000005484 gravity Effects 0.000 description 5
- 239000004793 Polystyrene Substances 0.000 description 2
- 230000007547 defect Effects 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 229920002223 polystyrene Polymers 0.000 description 2
- 239000012792 core layer Substances 0.000 description 1
- 238000011900 installation process Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000002844 melting Methods 0.000 description 1
- 230000008018 melting Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000008092 positive effect Effects 0.000 description 1
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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
- 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
-
- 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
- C08J9/00—Working-up of macromolecular substances to porous or cellular articles or materials; After-treatment thereof
- C08J9/0061—Working-up of macromolecular substances to porous or cellular articles or materials; After-treatment thereof characterized by the use of several polymeric components
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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
- C08J9/00—Working-up of macromolecular substances to porous or cellular articles or materials; After-treatment thereof
- C08J9/0066—Use of inorganic compounding ingredients
-
- 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
- C08J9/00—Working-up of macromolecular substances to porous or cellular articles or materials; After-treatment thereof
- C08J9/0085—Use of fibrous compounding ingredients
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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
- 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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- 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
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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
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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
- C08J2300/00—Characterised by the use of unspecified polymers
- C08J2300/14—Water soluble or water swellable polymers, e.g. aqueous gels
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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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- Chemical Kinetics & Catalysis (AREA)
- Polymers & Plastics (AREA)
- Organic Chemistry (AREA)
- Microelectronics & Electronic Packaging (AREA)
- Electromagnetism (AREA)
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- Textile Engineering (AREA)
- Inorganic Chemistry (AREA)
- Manufacture Of Porous Articles, And Recovery And Treatment Of Waste Products (AREA)
- Molding Of Porous Articles (AREA)
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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| Application Number | Priority Date | Filing Date | Title |
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| CN202111060629.1A CN113912934A (en) | 2021-09-10 | 2021-09-10 | Hollow thin-wall tubular bead foamed polymer wave-absorbing material and preparation method thereof |
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| CN202111060629.1A CN113912934A (en) | 2021-09-10 | 2021-09-10 | Hollow thin-wall tubular bead foamed polymer wave-absorbing material and preparation method thereof |
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| CN113912934A true CN113912934A (en) | 2022-01-11 |
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| CN202111060629.1A Pending CN113912934A (en) | 2021-09-10 | 2021-09-10 | Hollow thin-wall tubular bead foamed polymer wave-absorbing material and preparation method thereof |
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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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- 2021-09-10 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 (3)
| 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 |
| CN117089142B (en) * | 2023-09-19 | 2024-10-01 | 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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