CN111073265A - Environment-friendly wave-absorbing material and preparation method thereof - Google Patents
Environment-friendly wave-absorbing material and preparation method thereof Download PDFInfo
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- CN111073265A CN111073265A CN201911418499.7A CN201911418499A CN111073265A CN 111073265 A CN111073265 A CN 111073265A CN 201911418499 A CN201911418499 A CN 201911418499A CN 111073265 A CN111073265 A CN 111073265A
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
- C08J5/00—Manufacture of articles or shaped materials containing macromolecular substances
- C08J5/18—Manufacture of films or sheets
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- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05K—PRINTED CIRCUITS; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS
- H05K9/00—Screening of apparatus or components against electric or magnetic fields
- H05K9/0073—Shielding materials
- H05K9/0081—Electromagnetic shielding materials, e.g. EMI, RFI shielding
- H05K9/0083—Electromagnetic shielding materials, e.g. EMI, RFI shielding comprising electro-conductive non-fibrous particles embedded in an electrically insulating supporting structure, e.g. powder, flakes, whiskers
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- 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
- C08J2375/00—Characterised by the use of polyureas or polyurethanes; Derivatives of such polymers
- C08J2375/04—Polyurethanes
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
- C08K5/00—Use of organic ingredients
- C08K5/04—Oxygen-containing compounds
- C08K5/05—Alcohols; Metal alcoholates
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
- C08K5/00—Use of organic ingredients
- C08K5/36—Sulfur-, selenium-, or tellurium-containing compounds
- C08K5/45—Heterocyclic compounds having sulfur in the ring
- C08K5/46—Heterocyclic compounds having sulfur in the ring with oxygen or nitrogen in the ring
- C08K5/47—Thiazoles
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
- C08K7/00—Use of ingredients characterised by shape
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Abstract
An environment-friendly wave-absorbing material is characterized by comprising the following components in percentage by weight: 100 parts of magnetic powder absorbent, 10-50 parts of water-soluble polyurethane resin, 80-150 parts of water, 0.2-1.5 parts of thickening agent, 0.1-1 part of polysiloxane flatting agent, 0.1-1 part of curing agent and 0.5-5 parts of cosolvent, wherein the magnetic powder absorbent is one or a mixture of more of sheet iron-silicon-aluminum alloy powder, sheet iron-silicon-nickel alloy powder, sheet iron-nickel alloy powder and sheet iron-silicon-chromium alloy powder. In addition, the prepared wave-absorbing material has the advantages of solvent resistance, strong hydrolysis resistance, excellent electromagnetic property and mechanical property and high production efficiency, only uses a few organic solvents by taking water as a main solvent in the preparation process, hardly generates waste gas pollution and is very environment-friendly.
Description
Technical Field
The invention relates to the field of wave-absorbing materials, in particular to an environment-friendly wave-absorbing material and a preparation method thereof.
Background
The wave-absorbing material is a novel functional material, can gather and absorb electromagnetic wave energy with a specific frequency range, which is projected on the surface of the wave-absorbing material. The wave-absorbing material is prepared by filling an absorbent in the material, wherein the absorbent is usually metal or alloy powder, and the absorbent powder is fully dispersed in a base material by a processing technology of a high polymer base material to finally obtain the usable material.
Materials made of different kinds of absorbents have different functions. For example, soft magnetic ferrite powder is used as an absorbent, and silicon rubber is used as a base material to prepare a material, so that the material can absorb electromagnetic waves under MHz frequency, is used in the anti-metal radio frequency electronic tag industry, and realizes the aggregation and conduction of radio frequency electromagnetic signals; for example, carbon black and carbonyl iron powder are used as absorbents, and epoxy resin is used as a base material to prepare a coating, so that the coating has a good absorption effect on electromagnetic waves at GHz frequency, and can be used as a stealth material in the military field.
There are many ways of shaping the absorbing material, of which the coating or casting process is the most common one. The process is that polymer resin is dissolved in organic solvent, added with absorbent powder, coated or cast, and high temperature evaporated to eliminate organic solvent to obtain film-like wave absorbing material. In this production process, the organic solvent is converted into solvent vapor at high temperature, which causes serious pollution when discharged into the air, and even if corresponding waste gas treatment measures such as condensation recovery or adsorption are taken, part of the organic solvent vapor is discharged. Therefore, it is necessary to find a production process of the wave-absorbing material which is friendly to the environment.
Disclosure of Invention
The invention provides a formula of an environment-friendly wave-absorbing material.
The invention also aims to provide a preparation method of the wave-absorbing material by utilizing the formula in the invention.
The invention is implemented according to the following technical scheme:
an environment-friendly wave-absorbing material is characterized by comprising the following components in percentage by weight:
100 parts of magnetic powder absorbent, 10-50 parts of water-soluble polyurethane resin, 80-150 parts of water, 0.2-1.5 parts of thickening agent, 0.1-1 part of flatting agent, 0.1-1 part of curing agent and 0.5-5 parts of cosolvent.
Preferably, the magnetic powder absorbent is one or a mixture of several of flake iron-silicon-aluminum alloy powder, flake iron-silicon-nickel alloy powder, flake iron-nickel alloy powder and flake iron-silicon-chromium alloy powder.
Preferably, the thickener is one or a mixture of more of methylcellulose, sodium carboxymethylcellulose, hydroxypropyl methylcellulose and hydroxyethyl cellulose.
Preferably, the leveling agent is a polysiloxane-based leveling agent.
Preferably, the curing agent is one of dibenzothiazyl disulfide, benzothiazole sulfenamide and dithiocarbamate.
Preferably, the cosolvent is one or a mixture of ethanol, acetone or acetonitrile.
A preparation method of an environment-friendly wave-absorbing material is characterized by comprising the following steps:
1) dissolving the leveling agent and the thickening agent in the formula amount into an aqueous solution, adding the polyurethane resin in the formula amount, and mixing and stirring uniformly;
2) adding a magnetic powder absorbent in a formula amount into the mixture obtained in the step 1), and stirring for 2-4 hours at normal temperature;
3) dissolving the curing agent with the formula amount in the cosolvent with the formula amount, adding the mixture into the mixture obtained in the step 2), and continuously stirring for 1 hour;
4) taking a PET release film as a base material, coating or tape-casting the mixture obtained in the step (3) on a coating machine or tape-casting machine to form a film, and drying the film by a blast oven at the temperature of 70-90 ℃ to obtain a semi-finished wave absorbing material;
5) and (4) placing the semi-finished wave-absorbing material obtained in the step (4) between two layers of PET release films, and vulcanizing for 5-20min in a flat vulcanizing machine at the temperature of 100-180 ℃ to obtain a finished wave-absorbing material.
The invention has the advantages that the water-soluble polyurethane resin is adopted to replace other high polymer resin, the main solvent is water to replace the organic solvent, only a very small amount of organic solvent is used for dissolving the auxiliary agent, and the waste gas generated in the preparation process hardly causes negative influence on the environment. The material is subjected to coating/tape casting and flat vulcanization secondary forming processes, and the polyurethane resin has higher crosslinking density and better hydrolysis resistance and solvent resistance after crosslinking and curing; in addition, the resin has better mechanical property and electromagnetic property after being crosslinked, and the preparation method has strong practicability and high production efficiency.
Detailed Description
The present invention is further described in detail by the following examples, which are not intended to limit the scope of the present invention, and the formulas or process parameters that can be selected by those skilled in the art according to the idea and process principle of the present invention are all within the scope of the present invention.
Example 1
An environment-friendly wave-absorbing material comprises the following components in percentage by weight:
100 parts of flaky iron-silicon-aluminum powder, 25 parts of water-soluble polyurethane resin, 120 parts of water, 0.5 part of sodium carboxymethylcellulose, 0.2 part of polysiloxane flatting agent, 1 part of dibenzothiazyl disulfide and 5 parts of ethanol.
The preparation method comprises the following steps:
1) dissolving 0.2 part of leveling agent and 0.5 part of sodium carboxymethylcellulose in water, adding water-soluble polyurethane resin after dissolving, and uniformly stirring;
2) adding 100 parts of sheet iron-silicon-aluminum powder, and stirring for 2.5 hours at normal temperature;
3) dissolving 0.5 part of dibenzothiazyl disulfide in 5 parts of ethanol, adding the solution into the mixture obtained in the step 2), and stirring the solution for 0.5 hour;
4) coating a wet film with the thickness of 0.25mm on a PET release film substrate by using a scraper type coating machine, wherein the temperature of an oven is 85 ℃;
5) covering a layer of PET release film on the upper surface, and vulcanizing for 15 minutes at 120 ℃ in a flat vulcanizing machine to obtain the wave-absorbing material product with the thickness of 0.15 mm.
Example 2
An environment-friendly wave-absorbing material comprises the following components in percentage by weight:
100 parts of flaky iron-silicon-chromium powder, 25 parts of water-soluble polyurethane resin, 80 parts of water, 1.5 parts of hydroxypropyl methyl cellulose, 0.8 part of polysiloxane flatting agent, 1 part of dithiocarbamate and 5 parts of acetone.
The preparation method comprises the following steps:
1) dissolving 0.8 part of leveling agent and 1.5 parts of hydroxypropyl methyl cellulose in water, adding 25 parts of water-soluble polyurethane resin, and stirring and mixing uniformly;
2) adding 100 parts of flaky iron-silicon-chromium powder, and stirring for 4 hours at normal temperature;
3) dissolving 1 part of dithiocarbamate by 5 parts of acetone, adding the dissolved dithiocarbamate into the mixture obtained in the step 2), and stirring for 1 hour;
4) coating a wet film with the thickness of 1.5mm on a thick PET release film substrate by using a casting machine, wherein the temperature of an oven is 90 ℃;
5) covering a layer of PET release film on the upper surface, and vulcanizing in a flat vulcanizing machine at 160 ℃ for 20 minutes to obtain the wave-absorbing material product with the thickness of 1 mm.
Example 3
An environment-friendly wave-absorbing material comprises the following components in percentage by weight:
100 parts of flaky iron-nickel alloy powder, 12 parts of water-soluble polyurethane resin, 150 parts of water, 1.5 parts of methyl cellulose, 0.2 part of polysiloxane leveling agent, 0.3 part of benzothiazole sulfonamide and 2 parts of acetonitrile.
The preparation method comprises the following steps:
1) dissolving 0.2 part of leveling agent and 1.5 parts of methyl cellulose in water, adding 12 parts of water-soluble polyurethane resin, and stirring and mixing uniformly;
2) adding 100 parts of sheet iron-nickel alloy powder, and stirring for 3 hours at normal temperature;
3) dissolving 0.3 part of benzothiazole sulfonamide by using 2 parts of acetonitrile, adding the solution into the mixture obtained in the step 2), and stirring the solution for 0.5 hour;
4) coating a wet film with the thickness of 60 micrometers on a PET release film substrate by using a transfer coater, wherein the temperature of an oven is 75 ℃;
5) covering a layer of PET release film on the upper surface, and vulcanizing for 10 minutes at 150 ℃ in a flat vulcanizing machine to obtain the wave-absorbing material product with the thickness of 30 microns.
Claims (5)
1. An environment-friendly wave-absorbing material is characterized by comprising the following components in percentage by weight: 100 parts of magnetic powder absorbent, 10-50 parts of water-soluble polyurethane resin, 80-150 parts of water, 0.2-1.5 parts of thickening agent, 0.1-1 part of polysiloxane flatting agent, 0.1-1 part of curing agent and 0.5-5 parts of cosolvent, wherein the magnetic powder absorbent is one or a mixture of more of sheet iron-silicon-aluminum alloy powder, sheet iron-silicon-nickel alloy powder, sheet iron-nickel alloy powder and sheet iron-silicon-chromium alloy powder.
2. The environment-friendly wave-absorbing material as claimed in claim 1, wherein the thickener is one or a mixture of several of methylcellulose, sodium carboxymethylcellulose, hydroxypropyl methylcellulose and hydroxyethyl cellulose.
3. The environment-friendly wave-absorbing material as claimed in claim 1, wherein the curing agent is one of dibenzothiazyl disulfide, benzothiazole sulfenamide and dithiocarbamate.
4. The environment-friendly wave-absorbing material as claimed in claim 1, wherein the cosolvent is one or a mixture of ethanol, acetone or acetonitrile.
5. A preparation method of an environment-friendly wave-absorbing material is characterized by comprising the following steps:
1) dissolving the leveling agent and the thickening agent in the formula amount into an aqueous solution, adding the polyurethane resin in the formula amount, and mixing and stirring uniformly;
2) adding a magnetic powder absorbent in a formula amount into the mixture obtained in the step 1), and stirring for 2-4 hours at normal temperature;
3) dissolving the curing agent with the formula amount in the cosolvent with the formula amount, adding the mixture into the mixture obtained in the step 2), and continuously stirring for 1 hour;
4) coating or tape-casting the mixture obtained in the step 3) on a coating machine or tape-casting machine to form a film by taking the PET release film as a base material, and drying the film by a blast oven at 70-90 ℃ to obtain a semi-finished wave absorbing material;
5) placing the semi-finished wave-absorbing material obtained in the step 4) between two layers of PET release films, and vulcanizing for 5-20min in a flat vulcanizing machine at the temperature of 180 ℃ with 100-.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201911418499.7A CN111073265A (en) | 2019-12-31 | 2019-12-31 | Environment-friendly wave-absorbing material and preparation method thereof |
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| CN201911418499.7A CN111073265A (en) | 2019-12-31 | 2019-12-31 | Environment-friendly wave-absorbing material and preparation method thereof |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111875949A (en) * | 2020-08-04 | 2020-11-03 | 苏州安洁新材料有限公司 | Preparation method of high-temperature-resistant hydrolysis-resistant wave-absorbing magnetic sheet |
| CN113004677A (en) * | 2021-01-29 | 2021-06-22 | 惠州市浩明科技股份有限公司 | High polymer material for protection and preparation method thereof |
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| CN108699378A (en) * | 2018-04-25 | 2018-10-23 | 深圳鹏汇功能材料有限公司 | Aqueous wave absorbing coating and its preparation method and application |
| CN109627529A (en) * | 2018-11-21 | 2019-04-16 | 重庆市鸿富诚电子新材料有限公司 | A kind of absorbing material of tape casting, preparation method and its Preparation equipment |
| CN109666392A (en) * | 2018-11-30 | 2019-04-23 | 苏州铂韬新材料科技有限公司 | A kind of environment-friendly type man coatings and preparation method thereof with excellent absorbing property |
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2019
- 2019-12-31 CN CN201911418499.7A patent/CN111073265A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN108504227A (en) * | 2018-03-29 | 2018-09-07 | 广州新莱福磁电有限公司 | A kind of aqueous magnet board coating and preparation method thereof |
| CN108699378A (en) * | 2018-04-25 | 2018-10-23 | 深圳鹏汇功能材料有限公司 | Aqueous wave absorbing coating and its preparation method and application |
| CN109627529A (en) * | 2018-11-21 | 2019-04-16 | 重庆市鸿富诚电子新材料有限公司 | A kind of absorbing material of tape casting, preparation method and its Preparation equipment |
| CN109666392A (en) * | 2018-11-30 | 2019-04-23 | 苏州铂韬新材料科技有限公司 | A kind of environment-friendly type man coatings and preparation method thereof with excellent absorbing property |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111875949A (en) * | 2020-08-04 | 2020-11-03 | 苏州安洁新材料有限公司 | Preparation method of high-temperature-resistant hydrolysis-resistant wave-absorbing magnetic sheet |
| CN113004677A (en) * | 2021-01-29 | 2021-06-22 | 惠州市浩明科技股份有限公司 | High polymer material for protection and preparation method thereof |
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Application publication date: 20200428 |