CN113185750A - Microwave dielectric material and preparation method and application thereof - Google Patents
Microwave dielectric material and preparation method and application thereof Download PDFInfo
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- 239000003989 dielectric material Substances 0.000 title claims abstract description 39
- 238000002360 preparation method Methods 0.000 title abstract description 10
- 239000000463 material Substances 0.000 claims abstract description 39
- 238000005187 foaming Methods 0.000 claims abstract description 38
- 239000011324 bead Substances 0.000 claims abstract description 31
- 239000000654 additive Substances 0.000 claims abstract description 23
- 239000002245 particle Substances 0.000 claims abstract description 19
- 230000000996 additive effect Effects 0.000 claims abstract description 9
- 238000000465 moulding Methods 0.000 claims abstract description 7
- -1 polypropylene Polymers 0.000 claims description 15
- 239000000843 powder Substances 0.000 claims description 10
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 claims description 8
- 239000004793 Polystyrene Substances 0.000 claims description 6
- 239000004033 plastic Substances 0.000 claims description 6
- 229920003023 plastic Polymers 0.000 claims description 6
- 229920002223 polystyrene Polymers 0.000 claims description 6
- 239000004743 Polypropylene Substances 0.000 claims description 5
- 229920001155 polypropylene Polymers 0.000 claims description 5
- 239000004814 polyurethane Substances 0.000 claims description 5
- 229920002635 polyurethane Polymers 0.000 claims description 5
- 235000012239 silicon dioxide Nutrition 0.000 claims description 4
- 239000000377 silicon dioxide Substances 0.000 claims description 4
- 238000010894 electron beam technology Methods 0.000 claims description 2
- 238000004519 manufacturing process Methods 0.000 claims description 2
- 238000000034 method Methods 0.000 claims description 2
- 230000005855 radiation Effects 0.000 claims 3
- 230000009977 dual effect Effects 0.000 claims 1
- 230000000052 comparative effect Effects 0.000 description 7
- 238000005516 engineering process Methods 0.000 description 7
- 238000012986 modification Methods 0.000 description 5
- 230000004048 modification Effects 0.000 description 5
- 238000012360 testing method Methods 0.000 description 4
- 238000010146 3D printing Methods 0.000 description 3
- 230000032683 aging Effects 0.000 description 3
- 238000004891 communication Methods 0.000 description 3
- 238000005336 cracking Methods 0.000 description 3
- 238000013461 design Methods 0.000 description 2
- 230000005251 gamma ray Effects 0.000 description 2
- 229920000642 polymer Polymers 0.000 description 2
- 239000004800 polyvinyl chloride Substances 0.000 description 2
- 229920000915 polyvinyl chloride Polymers 0.000 description 2
- 230000002035 prolonged effect Effects 0.000 description 2
- 239000000126 substance Substances 0.000 description 2
- 239000000758 substrate Substances 0.000 description 2
- 239000004677 Nylon Substances 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 230000018109 developmental process Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 230000005284 excitation Effects 0.000 description 1
- 230000005281 excited state Effects 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 238000013012 foaming technology Methods 0.000 description 1
- 230000003993 interaction 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
- C08J9/36—After-treatment
-
- 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
- C08J2325/00—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 an aromatic carbocyclic ring; Derivatives of such polymers
- C08J2325/02—Homopolymers or copolymers of hydrocarbons
- C08J2325/04—Homopolymers or copolymers of styrene
- C08J2325/06—Polystyrene
-
- 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
- C08J2423/00—Characterised by the use of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Derivatives of such polymers
- C08J2423/02—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
- C08J2423/10—Homopolymers or copolymers of propene
- C08J2423/12—Polypropene
-
- 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
- C08J2475/00—Characterised by the use of polyureas or polyurethanes; Derivatives of such polymers
- C08J2475/04—Polyurethanes
-
- 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
- C08K2003/0806—Silver
-
- 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
-
- 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
- C08K3/34—Silicon-containing compounds
- C08K3/36—Silica
Abstract
The invention discloses a microwave dielectric material, a preparation method and application thereof, wherein the microwave dielectric material is obtained by doping an additive into a foaming material, foaming and molding the foaming material and then performing irradiation treatment on the foaming material, and the preparation method comprises the following steps: s1, carrying out pre-foaming treatment on the foaming material to obtain beads, and dividing the beads into multiple groups with different particle sizes; s2, independently adding additives into each group of beads, fully mixing, and foaming again for forming; and S3, performing irradiation treatment on the foamed and molded material to obtain the microwave dielectric material. According to the invention, by selecting proper foaming main materials and additives and controlling the energy density and the irradiation angle of the irradiation rays, the precise control of the dielectric constant is realized, and the tangent angle loss is greatly reduced.
Description
Technical Field
The invention relates to the technical field of microwave dielectric materials, in particular to a microwave dielectric material and a preparation method and application thereof.
Background
With the rapid development of communication technology, navigation technology, radar anti-interference technology and other technologies, various applications put more strict requirements on microwave media. A large-capacity communication system needs a wider frequency band, and needs a dielectric substrate and a microwave dielectric body with accurate and controllable and uniform dielectric constants; the microwave device and the dielectric antenna also need a lower-loss microwave dielectric body; meanwhile, a microwave medium with higher structural strength and better environmental adaptability is needed.
The traditional microwave medium has dielectric constant solidification, is difficult to accurately control production, and has larger tangent angle loss in high-frequency electromagnetic waves. Therefore, a microwave medium with precisely controllable dielectric constant and extremely low tangent loss is urgently needed to meet the use requirement.
Disclosure of Invention
The invention aims to provide a microwave dielectric material which has low dielectric constant error, low dielectric constant uniformity error and low dielectric tangent angle loss.
In addition, the invention also provides a preparation method and application of the microwave dielectric material.
The invention is realized by the following technical scheme:
the microwave dielectric material is obtained by doping additives into a foaming material, foaming and molding, and then carrying out irradiation treatment.
The microwave dielectric material is based on an irradiation modification technology, is combined with technical means such as traditional foaming or 3D printing, is the same as the traditional foaming technology in 3D printing technology, and aims to realize the molding of microwave dielectric bodies with different dielectric constants and then carry out irradiation modification.
And the interaction of the irradiation ray and the substance is utilized to cause ionization, excitation and other effects in the primary formed dielectric material, so that the structure or the state of the primary formed dielectric material is changed. A series of reactions occur between active groups or particles such as ion pairs, free radicals, electrons or long-chain molecules in an excited state and the like formed when the irradiation rays are ionized after the irradiation rays react with the primary forming medium material to form new chemical bonds, so that the high polymer molecular chains are crosslinked and converted into a three-dimensional network structure from a two-dimensional structure, the temperature resistance, the aging resistance, the cracking resistance and the flame retardance of the primary forming medium material are greatly improved, meanwhile, the stability performance life of the medium material is greatly prolonged, and the structural performance of the medium material is also enhanced.
Experiments prove that the microwave dielectric material can achieve the following effects:
preparing a finished product with dielectric constant error: less than +/-1 percent
Preparing a finished product with dielectric constant uniformity error: less than plus or minus 0.5 percent
Medium tangent angle loss: < 5X 10-4。
Furthermore, in order to further realize accurate control of the electrical constant and greatly reduce the tangent angle loss, the foaming material is polystyrene, polypropylene plastic or polyurethane; the additive at least comprises one of aluminum silver powder and silicon dioxide; when the aluminum silver powder and the silicon dioxide are mixed for use, the using amounts of the aluminum silver powder and the silicon dioxide are in different proportions according to different designed dielectric constant ratios of the microwave dielectric material; the energy density of the irradiation ray is controlled during irradiation treatment, and different irradiation doses are adopted according to different structural characteristics of the microwave medium material, such as thickness, weight, appearance and the like, and structural modification required to be generated after irradiation. Taking Co gamma ray as an example, the irradiation is usually continuously carried out for 2 hours, the dose is 100-10000 kGy, and the irradiation angle is uniform irradiation.
According to the invention, by selecting proper foaming main materials and additives and controlling the energy density and the irradiation angle of the irradiation rays, the precise control of the dielectric constant is realized, and the tangent angle loss is greatly reduced.
Further, the irradiation source used in the irradiation treatment includes a gamma irradiation device, an electron beam accelerator, or high intensity ultraviolet.
Further, the irradiation source adopted in the irradiation treatment comprises a single-plate source, a double-plate source or a columnar source.
A preparation method of a microwave dielectric material comprises the following steps:
s1, carrying out pre-foaming treatment on the foaming material to obtain beads, and dividing the beads into multiple groups with different particle sizes;
s2, independently adding additives into each group of beads, fully mixing, and foaming again for forming;
and S3, performing irradiation treatment on the foamed and molded material to obtain the microwave dielectric material.
The invention divides the bead materials into a plurality of groups with different particle sizes by grouping the bead materials, generates a plurality of groups of bead materials with different particle sizes after pre-foaming, mixes the additive into the bead materials with different particle sizes according to the dielectric constant required by design and carries out re-foaming molding, and aims to realize microwave media with different dielectric constants through the bead materials with different particle sizes and the additives with different proportions.
An application of microwave dielectric material in preparing microwave devices and dielectric antennas.
Compared with the prior art, the invention has the following advantages and beneficial effects:
1. the microwave dielectric material with accurate and controllable dielectric constant and extremely low tangent angle loss is prepared based on the irradiation modification technology and by combining the traditional foaming or 3D printing and other technical means, and the urgent needs of various application scenes are met.
2. According to the invention, by selecting proper foaming main materials and additives and controlling the energy density and the irradiation angle of the irradiation rays, the precise control of the dielectric constant is realized, and the tangent angle loss is greatly reduced. .
3. The invention divides the bead materials into a plurality of groups with different particle sizes by grouping the bead materials, generates a plurality of groups of bead materials with different particle sizes after pre-foaming, mixes the additive into the bead materials with different particle sizes according to the dielectric constant required by design and carries out re-foaming molding, and aims to realize microwave media with different dielectric constants through the bead materials with different particle sizes and the additives with different proportions.
4. The microwave dielectric material prepared by the invention has excellent temperature resistance, aging resistance, cracking resistance and flame retardance, and simultaneously has good stability and structural performance, so that the service life of the microwave dielectric material is greatly prolonged.
5. The invention can solve the urgent need of microwave medium in a plurality of applications such as communication, navigation, radar and the like at present, including but not limited to a plurality of microwave medium application scenes such as a microwave high-frequency medium substrate, a microwave cavity deceleration medium matrix, a luneberg lens antenna and the like. The problems that the dielectric constant of the traditional microwave medium is not easy to adjust, the tangent angle loss is large and the like are solved, and the system efficiency is greatly improved.
Description of the drawings:
FIG. 1 is a process flow diagram of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is further described in detail below with reference to examples and accompanying drawings, and the exemplary embodiments and descriptions thereof are only used for explaining the present invention and are not meant to limit the present invention.
Example 1:
the microwave dielectric material is obtained by doping additives into a foaming material, foaming and molding, and then carrying out irradiation treatment.
In this embodiment, as shown in fig. 1, the preparation method of the microwave dielectric material includes the following steps:
s1, carrying out pre-foaming treatment on polystyrene, polypropylene plastic or polyurethane to obtain beads, and dividing the beads into multiple groups with different particle sizes;
s2, selecting 120g of beads with the particle size of 1.4-1.5 mm, selecting aluminum silver powder as an additive, adding the aluminum silver powder according to 10% of the weight of the beads, fully mixing, and foaming again for forming;
s3, performing irradiation treatment on the foamed and molded material to obtain a microwave dielectric material:
the irradiation treatment adopts Co gamma rays as an irradiation source, continuous 2-hour irradiation is adopted, the irradiation dose is 300kGy, and the irradiation angle is uniform irradiation.
Example 2:
the present example is based on example 1, differing from example 1 in that the foaming material, the additives and the irradiation conditions are different, in particular:
in this embodiment, the preparation method of the microwave dielectric material includes the following steps:
s1, carrying out pre-foaming treatment on polystyrene, polypropylene plastic or polyurethane to obtain beads, and dividing the beads into multiple groups with different particle sizes;
s2, selecting 600g of beads with the particle size of 1.1-1.2 mm, selecting aluminum silver powder as an additive, adding the aluminum silver powder according to 7% of the weight of the beads, fully mixing, and foaming again for forming;
s3, performing irradiation treatment on the foamed and molded material to obtain a microwave dielectric material:
the irradiation treatment adopts Co gamma ray as irradiation source, continuous 2-hour irradiation is adopted, the irradiation dose is 1800kGy, and the irradiation angle is uniform irradiation.
Example 3:
the present example is based on example 1, differing from example 1 in that the foaming material, the additives and the irradiation conditions are different, in particular:
in this embodiment, the preparation method of the microwave dielectric material includes the following steps:
s1, carrying out pre-foaming treatment on polystyrene, polypropylene plastic or polyurethane polystyrene to obtain beads, and dividing the beads into multiple groups with different particle sizes;
s2, selecting 120g of beads with the particle size of 0.9-1.0 mm, selecting aluminum silver powder as an additive, adding the aluminum silver powder according to 5% of the weight of the beads, fully mixing, and foaming again for forming;
s3, performing irradiation treatment on the foamed and molded material to obtain a microwave dielectric material:
the irradiation treatment adopts Co gamma rays as an irradiation source, continuous 2-hour irradiation is adopted, the irradiation dose is 1000kGy, and the irradiation angle is uniform irradiation.
Comparative example 1:
this comparative example is based on example 1, differing from example 1 in that the foamed material is different, in particular:
the foaming material is Pa1010 nylon.
Comparative example 2:
this comparative example is based on example 1, differing from example 1 in that, unlike the additives, in particular:
the additive is PVC polyvinyl chloride plastic particles.
Comparative example 3:
this comparative example is based on example 1, differing from example 1 in that the irradiation conditions are different, in particular:
the irradiation dose was 10000 kGy.
The microwave dielectric materials prepared in the examples 1 to 3 and the comparative examples 1 to 3 are subjected to performance tests, including dielectric constant error test, dielectric constant uniformity error test, dielectric tangent angle loss, temperature resistance, aging resistance, cracking resistance and flame retardance test.
The test results are shown in table 1:
TABLE 1
The above-mentioned embodiments are intended to illustrate the objects, technical solutions and advantages of the present invention in further detail, and it should be understood that the above-mentioned embodiments are merely exemplary embodiments of the present invention, and are not intended to limit the scope of the present invention, and any modifications, equivalent substitutions, improvements and the like made within the spirit and principle of the present invention should be included in the scope of the present invention.
Claims (8)
1. The microwave dielectric material is characterized in that the microwave dielectric material is obtained by doping additives into a foaming material, foaming and molding, and then carrying out irradiation treatment.
2. A microwave dielectric material as in claim 1 wherein the foamed material is polystyrene, polypropylene plastic or polyurethane.
3. A microwave dielectric material as in claim 1 wherein the additive comprises at least one of aluminum silver powder and silicon dioxide.
4. A microwave dielectric material as claimed in claim 1, wherein the irradiation angle of the irradiation radiation is controlled to be uniform during the irradiation treatment.
5. A microwave dielectric material as in claim 1, wherein the irradiation source used in the irradiation treatment comprises gamma irradiation device, electron beam accelerator or high intensity ultraviolet.
6. A microwave dielectric material as in claim 1 wherein the radiation source used in the radiation treatment is in the form of a single plate source, a dual plate source or a cylindrical source.
7. A method for preparing a microwave dielectric material as claimed in any one of claims 1 to 6, comprising the steps of:
s1, carrying out pre-foaming treatment on the foaming material to obtain beads, and dividing the beads into multiple groups with different particle sizes;
s2, independently adding additives into each group of beads, fully mixing, and foaming again for forming;
and S3, performing irradiation treatment on the foamed and molded material to obtain the microwave dielectric material.
8. Use of a microwave dielectric material as claimed in any one of claims 1 to 6 in the manufacture of microwave devices, dielectric antennas.
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| CN202110452765.9A CN113185750A (en) | 2021-04-26 | 2021-04-26 | Microwave dielectric material and preparation method and application thereof |
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Application publication date: 20210730 |