CN111363285A - Preparation method of PMI high-temperature-resistant wave-absorbing material - Google Patents
Preparation method of PMI high-temperature-resistant wave-absorbing material Download PDFInfo
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- CN111363285A CN111363285A CN202010310075.5A CN202010310075A CN111363285A CN 111363285 A CN111363285 A CN 111363285A CN 202010310075 A CN202010310075 A CN 202010310075A CN 111363285 A CN111363285 A CN 111363285A
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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
- C08J9/04—Working-up of macromolecular substances to porous or cellular articles or materials; After-treatment thereof using blowing gases generated by a previously added blowing agent
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29B—PREPARATION OR PRETREATMENT OF THE MATERIAL TO BE SHAPED; MAKING GRANULES OR PREFORMS; RECOVERY OF PLASTICS OR OTHER CONSTITUENTS OF WASTE MATERIAL CONTAINING PLASTICS
- B29B9/00—Making granules
- B29B9/02—Making granules by dividing preformed 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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- 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
- B29C44/00—Shaping by internal pressure generated in the material, e.g. swelling or foaming ; Producing porous or cellular expanded plastics articles
- B29C44/34—Auxiliary operations
- B29C44/3461—Making or treating expandable particles
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08F—MACROMOLECULAR COMPOUNDS OBTAINED BY REACTIONS ONLY INVOLVING CARBON-TO-CARBON UNSATURATED BONDS
- C08F220/00—Copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and only one being terminated by only one carboxyl radical or a salt, anhydride ester, amide, imide or nitrile thereof
- C08F220/02—Monocarboxylic acids having less than ten carbon atoms; Derivatives thereof
- C08F220/04—Acids; Metal salts or ammonium salts thereof
- C08F220/06—Acrylic acid; Methacrylic acid; Metal salts or ammonium salts thereof
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08F—MACROMOLECULAR COMPOUNDS OBTAINED BY REACTIONS ONLY INVOLVING CARBON-TO-CARBON UNSATURATED BONDS
- C08F220/00—Copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and only one being terminated by only one carboxyl radical or a salt, anhydride ester, amide, imide or nitrile thereof
- C08F220/02—Monocarboxylic acids having less than ten carbon atoms; Derivatives thereof
- C08F220/42—Nitriles
- C08F220/44—Acrylonitrile
- C08F220/46—Acrylonitrile with carboxylic acids, sulfonic acids or salts thereof
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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
- C08J9/0061—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
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- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09K—MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE
- C09K3/00—Materials not provided for elsewhere
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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
- C08J2333/00—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 only one being terminated by only one carboxyl radical, or of salts, anhydrides, esters, amides, imides, or nitriles thereof; Derivatives of such polymers
- C08J2333/02—Homopolymers or copolymers of acids; Metal or ammonium salts thereof
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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
- C08J2333/00—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 only one being terminated by only one carboxyl radical, or of salts, anhydrides, esters, amides, imides, or nitriles thereof; Derivatives of such polymers
- C08J2333/18—Homopolymers or copolymers of nitriles
- C08J2333/20—Homopolymers or copolymers of acrylonitrile
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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
- C08J2463/00—Characterised by the use of epoxy resins; Derivatives of epoxy resins
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- Polymers & Plastics (AREA)
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Abstract
The invention discloses a preparation method of a PMI high-temperature resistant wave-absorbing material, which comprises the following eight steps: preparing a PMI prepolymer columnar particle jig; preparing a PMI prepolymer; water bath is carried out on the pore cavity mold array injected with the mixture to obtain a methacrylic acid and methacrylonitrile copolymer column; granulating by a granulator to obtain foamable PMI prepolymer particles; pre-foaming the foamable PMI prepolymer particles; preparing an electromagnetic wave absorbent; preparing PMI wave-absorbing foam particles; and (3) putting the PMI wave-absorbing foam particles into a molding press to perform film pressing operation. The invention has the advantages that: the wave-absorbing material has the advantages of good high-temperature resistance, good electromagnetic wave absorbability, uniform mixing of the absorbent in the foam and the like.
Description
Technical Field
The invention relates to the technical field of wave-absorbing material preparation, in particular to a preparation method of a PMI high-temperature-resistant wave-absorbing material.
Background
The PMI wave-absorbing material has the advantages that the PMI wave-absorbing material is of a closed-cell structure, the PMI foam cannot be adsorbed inside a polyurethane hole like an open-cell structure of polyurethane, and cannot be mixed with a high polymer and an absorbent like a polyurethane hole, so that the PMI wave-absorbing material has certain difficulty in development.
Some PMI high-temperature resistant wave absorbing materials in the market at present directly add an electromagnetic wave absorbent into PMI polymer, PMI foam takes methacrylic acid and methacrylonitrile as comonomers, and since the monomers belong to liquid, the absorbent is basically inorganic substances, such as carbon black, graphite and manganese dioxide, after the methacrylic acid and the methacrylonitrile monomers are mixed, the inorganic substances precipitate after stirring is stopped, and the phenomena of unsuccessful polymerization or uneven distribution of a conductive agent are caused. Or some technologies adopt a method of covering the surface of the PMI foam plate to solve the addition of the absorbent, which are not good for solving the problem of the addition of the absorbent of the PMI high-temperature resistant absorbing material.
Disclosure of Invention
In order to solve the various problems, the invention provides a preparation method of a PMI high-temperature resistant wave-absorbing material, the wave-absorbing material prepared by the method has good high-temperature resistance and good electromagnetic wave absorbability, and an absorbent can be uniformly mixed in foam.
In order to solve the technical problems, the technical scheme provided by the invention is as follows: the preparation method of the PMI high-temperature resistant wave-absorbing material comprises the following steps:
preparing PMI prepolymer columnar particle jigs, namely preparing N quartz tubes, neatly arranging and fixing the N quartz tubes together, and forming cylindrical cavity die arrays after the N quartz tubes are arranged together, wherein the length and the width of the whole quartz tubes are about 10cm × 10cm to 50cm × 50 cm;
step two: preparation of PMI prepolymer: uniformly mixing methacrylic acid and methacrylonitrile, adding magnesium oxide into the mixture, stirring the mixture until the magnesium oxide is completely dissolved, adding a mixture of N-butyl alcohol and tert-butyl alcohol serving as a foaming agent, dibenzoyl peroxide and tert-butyl peroxybenzoate serving as an initiator and N2-dimethylformamide, uniformly stirring the mixture, injecting the mixture into a prepared hole cavity die in the first step, and tightly plugging the openings of two glass tubes by using polymerized PMI prepolymer columnar particles;
step three: putting the hole cavity mold array injected with the mixture into a water bath at 40-60 ℃ for reaction for 72-100 h until the mixture is polymerized into methacrylic acid and methacrylonitrile copolymer columns, extracting all methacrylic acid and methacrylonitrile copolymer columns, polymerizing the prepared methacrylic acid and methacrylonitrile copolymer columns in an oven at 80-120 ℃ for 10-12 h, and obtaining a plurality of foamable methacrylic acid and methacrylonitrile copolymer columns after polymerization;
step four: putting one prepared polymer into a granulator according to 20-100 groups, and cutting into particles with the length of 0.5-2mm to finally obtain cylindrical prepolymer particles of methacrylic acid and methacrylonitrile, namely foaming PMI prepolymer particles, which are foamable with the length of 0.5-2mm and the diameter of 0.5-2 mm;
step five: pre-foaming expandable PMI prepolymer particles: preheating PMI prepolymer particles in an oven at 140-150 ℃ for 2 hours, and then heating to 180-200 ℃ for foaming for 1-2 hours; obtaining incompletely foamed PMI foam particles, namely PMI pre-foamed particles, and collecting the pre-foamed particles to be treated;
step six: preparing an electromagnetic wave absorbent: mixing the epoxy resin solution with carbon black, graphite and manganese dioxide according to a certain proportion to obtain an electromagnetic wave absorbent;
step seven: preparing PMI wave-absorbing foam particles: stirring and mixing the electromagnetic wave absorbent and the PMI pre-foaming foam particles according to a certain proportion, simultaneously heating a stirring barrel, stirring until the particles are completely dried to obtain PMI wave absorbing foam particles, wherein the epoxy resin is not cured at the moment;
step eight: feeding the PMI wave absorbing foam particles into a mould press, preheating the PMI wave absorbing foam particles for 2 hours in a mould press mould at the temperature of 130-150 ℃, then foaming for 2-3 hours at the temperature of 190-220 ℃, simultaneously melting and curing epoxy resin in the heating process, forming a PMI high temperature resistant wave absorbing material with an integrated structure in a mould cavity, opening the mould to take out a product, and finally stabilizing for 5-6 hours in an oven at the temperature of 160 ℃ to finally obtain the PMI high temperature resistant wave absorbing foam material.
Preferably, the tube inner diameter of the quartz tube in the first step is 0.5-2mm, the wall thickness is 1-5mm, and the length is 1 m.
Preferably, the specific dosage of each raw material in the second step is as follows: methacrylic acid and methacrylonitrile were mixed according to a 50: 50, adding 1-5 parts of magnesium oxide, stirring until the magnesium oxide is completely dissolved, adding a mixture of 1-7% of N-butyl alcohol and tert-butyl alcohol as a foaming agent, 0.2-0.3% of dibenzoyl peroxide and tert-butyl peroxybenzoate as an initiator and 0.1-0.2% of N2-dimethylformamide.
Preferably, in the sixth step, the ratio of the epoxy resin to the mixture of carbon black, graphite and manganese dioxide is about 45% -70%: 55 to 30 percent.
Compared with the prior art, the invention has the advantages that: the PMI high-temperature-resistant wave-absorbing foam material prepared by the invention has good high-temperature resistance and good electromagnetic wave absorbability, and the absorbent can be uniformly mixed in the foam, thereby solving the problem of nonuniform distribution of the absorbent in the past.
Detailed Description
The present invention will be described in further detail with reference to examples.
Example 1
The preparation method of the PMI high-temperature resistant wave-absorbing material comprises the following steps:
preparing PMI prepolymer columnar particle jigs, namely preparing N quartz tubes, neatly arranging and fixing the N quartz tubes together, and forming cylindrical cavity die arrays after the N quartz tubes are arranged together, wherein the length and the width of the whole quartz tubes are about 10cm × 10cm to 50cm × 50 cm;
step two: preparation of PMI prepolymer: uniformly mixing methacrylic acid and methacrylonitrile, adding magnesium oxide into the mixture, stirring the mixture until the magnesium oxide is completely dissolved, adding a mixture of N-butyl alcohol and tert-butyl alcohol serving as a foaming agent, dibenzoyl peroxide and tert-butyl peroxybenzoate serving as an initiator and N2-dimethylformamide, uniformly stirring the mixture, injecting the mixture into a prepared hole cavity die in the first step, and tightly plugging the openings of two glass tubes by using polymerized PMI prepolymer columnar particles;
step three: putting the hole cavity mold array injected with the mixture into a water bath at 40-60 ℃ for reaction for 72-100 h until the mixture is polymerized into methacrylic acid and methacrylonitrile copolymer columns, extracting all methacrylic acid and methacrylonitrile copolymer columns, polymerizing the prepared methacrylic acid and methacrylonitrile copolymer columns in an oven at 80-120 ℃ for 10-12 h, and obtaining a plurality of foamable methacrylic acid and methacrylonitrile copolymer columns after polymerization;
step four: putting one prepared polymer into a granulator according to 20-100 groups, and cutting into particles with the length of 0.5-2mm to finally obtain cylindrical prepolymer particles of methacrylic acid and methacrylonitrile, namely foaming PMI prepolymer particles, which are foamable with the length of 0.5-2mm and the diameter of 0.5-2 mm;
step five: pre-foaming expandable PMI prepolymer particles: preheating PMI prepolymer particles in an oven at 140-150 ℃ for 2 hours, and then heating to 180-200 ℃ for foaming for 1-2 hours; obtaining incompletely foamed PMI foam particles, namely PMI pre-foamed particles, and collecting the pre-foamed particles to be treated;
step six: preparing an electromagnetic wave absorbent: mixing the epoxy resin solution with carbon black, graphite and manganese dioxide according to a certain proportion to obtain an electromagnetic wave absorbent;
step seven: preparing PMI wave-absorbing foam particles: stirring and mixing the electromagnetic wave absorbent and the PMI pre-foaming foam particles according to a certain proportion, simultaneously heating a stirring barrel, stirring until the particles are completely dried to obtain PMI wave absorbing foam particles, wherein the epoxy resin is not cured at the moment;
step eight: feeding the PMI wave absorbing foam particles into a mould press, preheating the PMI wave absorbing foam particles for 2 hours in a mould press mould at the temperature of 130-150 ℃, then foaming for 2-3 hours at the temperature of 190-220 ℃, simultaneously melting and curing epoxy resin in the heating process, forming a PMI high temperature resistant wave absorbing material with an integrated structure in a mould cavity, opening the mould to take out a product, and finally stabilizing for 5-6 hours in an oven at the temperature of 160 ℃ to finally obtain the PMI high temperature resistant wave absorbing foam material.
The inner diameter of the quartz tube in the first step is 0.5-2mm, the wall thickness is 1-5mm, and the length is 1 m.
The specific dosage of each raw material in the step two is as follows: methacrylic acid and methacrylonitrile were mixed according to a 50: 50, adding 1-5 parts of magnesium oxide, stirring until the magnesium oxide is completely dissolved, adding a mixture of 1-7% of N-butyl alcohol and tert-butyl alcohol as a foaming agent, 0.2-0.3% of dibenzoyl peroxide and tert-butyl peroxybenzoate as an initiator and 0.1-0.2% of N2-dimethylformamide.
In the sixth step, the mixture of the epoxy resin, the carbon black, the graphite and the manganese dioxide is 45-70 percent: 55 to 30 percent.
Case one:
the plate with the thickness of 10mm is applied to communication traffic, aircraft radar stealth and reflectivity (90-degree vertical incidence) meeting radar camouflage test
1) The average value of the reflectivity of the Ka wave band is 10 dB;
2) the average value of the reflectivity of the Ku wave band is 14 dB;
3) the average value of the reflectivity of the X wave band is 14 dB;
4) the average value of the reflectivity of the C wave band is 10 dB;
5) the average reflectivity of the S band is 7 dB.
The present invention and its embodiments have been described above, but the description is not limited thereto, and the embodiments shown in the examples are only one of the embodiments of the present invention, and the actual method is not limited thereto. In summary, those skilled in the art should appreciate that methods and embodiments similar to those described above can be devised without departing from the spirit and scope of the present invention.
Claims (4)
- The preparation method of the PMI high-temperature-resistant wave-absorbing material is characterized by comprising the following steps of:preparing PMI prepolymer columnar particle jigs, namely preparing N quartz tubes, neatly arranging and fixing the N quartz tubes together, and forming cylindrical cavity die arrays after the N quartz tubes are arranged together, wherein the length and the width of the whole quartz tubes are about 10cm × 10cm to 50cm × 50 cm;step two: preparation of PMI prepolymer: uniformly mixing methacrylic acid and methacrylonitrile, adding magnesium oxide into the mixture, stirring the mixture until the magnesium oxide is completely dissolved, adding a mixture of N-butyl alcohol and tert-butyl alcohol serving as a foaming agent, dibenzoyl peroxide and tert-butyl peroxybenzoate serving as an initiator and N2-dimethylformamide, uniformly stirring the mixture, injecting the mixture into a prepared hole cavity die in the first step, and tightly plugging the openings of two glass tubes by using polymerized PMI prepolymer columnar particles;step three: putting the hole cavity mold array injected with the mixture into a water bath at 40-60 ℃ for reaction for 72-100 h until the mixture is polymerized into methacrylic acid and methacrylonitrile copolymer columns, extracting all methacrylic acid and methacrylonitrile copolymer columns, polymerizing the prepared methacrylic acid and methacrylonitrile copolymer columns in an oven at 80-120 ℃ for 10-12 h, and obtaining a plurality of foamable methacrylic acid and methacrylonitrile copolymer columns after polymerization;step four: putting one prepared polymer into a granulator according to 20-100 groups, and cutting into particles with the length of 0.5-2mm to finally obtain cylindrical prepolymer particles of methacrylic acid and methacrylonitrile, namely foaming PMI prepolymer particles, which are foamable with the length of 0.5-2mm and the diameter of 0.5-2 mm;step five: pre-foaming expandable PMI prepolymer particles: preheating PMI prepolymer particles in an oven at 140-150 ℃ for 2 hours, and then heating to 180-200 ℃ for foaming for 1-2 hours; obtaining incompletely foamed PMI foam particles, namely PMI pre-foamed particles, and collecting the pre-foamed particles to be treated;step six: preparing an electromagnetic wave absorbent: mixing the epoxy resin solution with carbon black, graphite and manganese dioxide according to a certain proportion to obtain an electromagnetic wave absorbent;step seven: preparing PMI wave-absorbing foam particles: stirring and mixing the electromagnetic wave absorbent and the PMI pre-foaming foam particles according to a certain proportion, simultaneously heating a stirring barrel, stirring until the particles are completely dried to obtain PMI wave absorbing foam particles, wherein the epoxy resin is not cured at the moment;step eight: feeding the PMI wave absorbing foam particles into a mould press, preheating the PMI wave absorbing foam particles for 2 hours in a mould press mould at the temperature of 130-150 ℃, then foaming for 2-3 hours at the temperature of 190-220 ℃, simultaneously melting and curing epoxy resin in the heating process, forming a PMI high temperature resistant wave absorbing material with an integrated structure in a mould cavity, opening the mould to take out a product, and finally stabilizing for 5-6 hours in an oven at the temperature of 160 ℃ to finally obtain the PMI high temperature resistant wave absorbing foam material.
- 2. The method for preparing PMI high-temperature-resistant wave-absorbing material according to claim 1, characterized in that: the inner diameter of the quartz tube in the first step is 0.5-2mm, the wall thickness is 1-5mm, and the length is 1 m.
- 3. The method for preparing PMI high-temperature-resistant wave-absorbing material according to claim 1, characterized in that: the specific dosage of each raw material in the step two is as follows: methacrylic acid and methacrylonitrile were mixed according to a 50: 50, adding 1-5 parts of magnesium oxide, stirring until the magnesium oxide is completely dissolved, adding a mixture of 1-7% of N-butyl alcohol and tert-butyl alcohol as a foaming agent, 0.2-0.3% of dibenzoyl peroxide and tert-butyl peroxybenzoate as an initiator and 0.1-0.2% of N2-dimethylformamide.
- 4. The method for preparing PMI high-temperature-resistant wave-absorbing material according to claim 1, characterized in that: in the sixth step, the mixture of the epoxy resin, the carbon black, the graphite and the manganese dioxide is 45-70 percent: 55 to 30 percent.
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Cited By (2)
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| CN114112170A (en) * | 2021-08-26 | 2022-03-01 | 无锡敬仁电子材料科技有限公司 | Method for measuring internal air pressure of polymer foaming beads for wave-absorbing material |
| CN115124646A (en) * | 2022-08-10 | 2022-09-30 | 湖南兆恒材料科技有限公司 | Super-thick high-temperature-resistant light broadband wave-absorbing PMI foam and preparation method thereof |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN114112170A (en) * | 2021-08-26 | 2022-03-01 | 无锡敬仁电子材料科技有限公司 | Method for measuring internal air pressure of polymer foaming beads for wave-absorbing material |
| CN115124646A (en) * | 2022-08-10 | 2022-09-30 | 湖南兆恒材料科技有限公司 | Super-thick high-temperature-resistant light broadband wave-absorbing PMI foam and preparation method thereof |
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