CN111606601A - Wave-absorbing composite material for shielding signals of electronic equipment and preparation process thereof - Google Patents
Wave-absorbing composite material for shielding signals of electronic equipment and preparation process thereof Download PDFInfo
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- CN111606601A CN111606601A CN202010479105.5A CN202010479105A CN111606601A CN 111606601 A CN111606601 A CN 111606601A CN 202010479105 A CN202010479105 A CN 202010479105A CN 111606601 A CN111606601 A CN 111606601A
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- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B26/00—Compositions of mortars, concrete or artificial stone, containing only organic binders, e.g. polymer or resin concrete
- C04B26/02—Macromolecular compounds
- C04B26/10—Macromolecular compounds obtained otherwise than by reactions only involving carbon-to-carbon unsaturated bonds
- C04B26/14—Polyepoxides
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- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B26/00—Compositions of mortars, concrete or artificial stone, containing only organic binders, e.g. polymer or resin concrete
- C04B26/02—Macromolecular compounds
- C04B26/10—Macromolecular compounds obtained otherwise than by reactions only involving carbon-to-carbon unsaturated bonds
- C04B26/16—Polyurethanes
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- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B2111/00—Mortars, concrete or artificial stone or mixtures to prepare them, characterised by specific function, property or use
- C04B2111/00241—Physical properties of the materials not provided for elsewhere in C04B2111/00
- C04B2111/00258—Electromagnetic wave absorbing or shielding materials
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Abstract
The invention discloses a wave-absorbing composite material for shielding signals of electronic equipment, which is characterized by comprising 15-30 parts of resin matrix by mass; 3-7 parts of a dispersing agent; 2-5 parts of an anti-settling agent; 10-20 parts of graphene; 10-20 parts of carbon nano tubes; 5-20 parts of silicon nitride powder; 5-20 parts of silicon dioxide powder; 10-15 parts of cobalt oxide; 10-15 parts of zinc oxide; 100 portions of solvent and 200 portions of solvent. The invention has good electromagnetic shielding effect and wave absorbing function. The graphene and the carbon nano tube have good mechanical properties, and simultaneously, the silicon dioxide and the silicon nitride are jointly used as an absorbent, so that the absorption waveband range of electromagnetic waves is expanded, and the absorption rate is enhanced; the zinc oxide and the cobalt oxide increase the hardness of the obtained composite material, and simultaneously improve the electromagnetic wave absorption rate of the material.
Description
[ technical field ] A method for producing a semiconductor device
The invention belongs to the field of wave-absorbing composite materials, and particularly relates to a wave-absorbing composite material for shielding signals of electronic equipment and a preparation process thereof.
[ background of the invention ]
Today, with the rapid development of radio technology and radar detection technology, electronic and communication devices have been developed towards the trends of sensitivity, density, high frequency and diversification, which not only cause electromagnetic wave interference, electromagnetic pollution, but also more importantly cause electromagnetic information leakage. In the field of materials, research and development of wave-absorbing coatings for shielding signals of electronic equipment are always the focus of attention in the material industry.
Electromagnetic radiation causes electromagnetic interference to various electronic devices and information systems, causes data transmission errors, and causes various accidents. More seriously, the human immune system is degraded by the long-term exposure to electromagnetic radiation. The traditional method adopts a metal shell for shielding, but the cost is high, the specific gravity is large, and the flexible application is difficult.
The wave-absorbing material technology is a technology for weakening, inhibiting, absorbing and deflecting target electromagnetic waves by designing and using certain specific materials. The wave-absorbing coating is a convenient, economic and good-adaptability wave-absorbing material, and is originally developed for radar wave-absorbing requirements of aerospace and aviation aircrafts. The existing wave-absorbing material has complex process, high density and more limited environmental application.
In order to prevent external signals from interfering communication, the electromagnetic shielding function is provided; in order to avoid being discovered by the local radar early, the wave absorbing function is also expected. Therefore, the material which has electromagnetic shielding and can absorb waves becomes a technical problem to be solved urgently by the technical field.
[ summary of the invention ]
The invention aims to overcome the defects of the prior art and provide a high-temperature-resistant stealth material and a preparation method thereof.
The technical scheme adopted by the invention is as follows: a wave-absorbing composite material for shielding signals of electronic equipment is characterized by comprising 15-30 parts by mass of a resin matrix; 3-7 parts of a dispersing agent; 2-5 parts of an anti-settling agent; 10-20 parts of graphene; 10-20 parts of carbon nano tubes; 5-20 parts of silicon nitride powder; 5-20 parts of silicon dioxide powder; 10-15 parts of cobalt oxide; 10-15 parts of zinc oxide; 100 portions of solvent and 200 portions of solvent.
Preferably, the dispersant is fatty acid polyethylene glycol ester, and the anti-settling agent is low molecular polyamide.
Preferably, the solvent is any one of xylene, anhydrous ethanol and acetone, or the volume ratio of xylene, anhydrous ethanol and acetone is 1: 2:1 mixture.
Preferably, the ratio of the silicon nitride powder to the silicon dioxide powder is 1: 1.
Preferably, the matrix resin is any one of polyurethane and epoxy resin.
A preparation method of a wave-absorbing composite material for shielding signals of electronic equipment is characterized by comprising the following steps:
step 1: mixing a resin matrix, a dispersing agent, an anti-settling agent and a solvent, and stirring for 0.5h at the rotation speed of 200-300 r/min to obtain a mixed liquid matrix;
step 2: putting the graphene, the silicon nitride powder and the cobalt oxide into a ball mill to perform ball milling at a rotating speed of 200 r/min until the mixed particles are 200-300 meshes;
and step 3: putting the carbon nano tube, the silicon dioxide powder and the zinc oxide into a ball mill to perform ball milling at the rotating speed of 300 r/min until the mixed particles are 200-300 meshes;
and 4, step 4: putting the mixed powder obtained by grinding the graphene, the silicon nitride powder and the cobalt oxide into a mixed liquid matrix, and then carrying out ultrasonic treatment on the mixed liquid;
and 5: putting mixed powder of carbon nano tubes, silicon dioxide powder and zinc oxide into a mixed liquid matrix, and then stirring the mixed liquid for 0.5-1 h at the stirring speed of 150-250 revolutions per minute;
step 6: and then pouring the mixed liquid obtained in the step 5 into a model to obtain the wave-absorbing composite material with the electronic equipment shielding signal.
The invention has the beneficial effects that: the invention has good electromagnetic shielding effect and wave absorbing function. The graphene and the carbon nano tube have good mechanical properties, and simultaneously, the silicon dioxide and the silicon nitride are jointly used as an absorbent, so that the absorption waveband range of electromagnetic waves is expanded, and the absorption rate is enhanced; the zinc oxide and the cobalt oxide increase the hardness of the obtained composite material, and simultaneously improve the electromagnetic wave absorption rate of the material.
Additional features and advantages of the invention will be set forth in the detailed description which follows.
[ detailed description ] embodiments
The technical solutions of the embodiments of the present invention are explained and illustrated below, but the following embodiments are only preferred embodiments of the present invention, and not all of them. Based on the embodiments in the implementation, other embodiments obtained by those skilled in the art without any creative effort belong to the protection scope of the present invention.
In the following description, the appearances of the indicating orientation or positional relationship such as the terms "inner", "outer", "upper", "lower", "left", "right", etc. are only for convenience in describing the embodiments and for simplicity in description, and do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and are not to be construed as limiting the present invention.
Example 1:
the embodiment provides a preparation method of a wave-absorbing composite material for shielding signals of electronic equipment, which comprises the following steps (the following parts are calculated by mass):
step 1: mixing 20 parts of resin matrix, 3 parts of dispersant, 2 parts of anti-settling agent and 150 parts of solvent, wherein the solvent is xylene, absolute ethyl alcohol and acetone according to a volume ratio of 1: stirring the mixture in a ratio of 2:1 for 0.5h at the rotation speed of 200 revolutions per minute to obtain a mixed liquid matrix;
step 2: putting 10 parts of graphene, 5 parts of silicon nitride powder and 10 parts of cobalt oxide into a ball mill, and ball-milling at a rotating speed of 200 revolutions per minute until mixed particles are 200 meshes;
and step 3: putting 10 parts of carbon nano tube, 5 parts of silicon dioxide powder and 10 parts of zinc oxide into a ball mill to perform ball milling at the rotating speed of 300 revolutions per minute until the mixed particles are 200 meshes;
and 4, step 4: putting the mixed powder obtained by grinding the graphene, the silicon nitride powder and the cobalt oxide into a mixed liquid matrix, and then carrying out ultrasonic treatment on the mixed liquid;
and 5: putting mixed powder of carbon nano tubes, silicon dioxide powder and zinc oxide into a mixed liquid matrix, and then stirring the mixed liquid for 1h at the stirring speed of 150 revolutions per minute;
step 6: and then pouring the mixed liquid obtained in the step 5 into a model to obtain the wave-absorbing composite material with the electronic equipment shielding signal.
Example 2:
the embodiment provides a preparation method of a wave-absorbing composite material for shielding signals of electronic equipment, which comprises the following steps (the following parts are calculated by mass):
step 1: mixing 20 parts of resin matrix, 3 parts of dispersant, 2 parts of anti-settling agent and 150 parts of solvent, wherein the solvent is xylene, absolute ethyl alcohol and acetone according to a volume ratio of 1: stirring the mixture in a ratio of 2:1 for 0.5h at the rotation speed of 200 revolutions per minute to obtain a mixed liquid matrix;
step 2: putting 15 parts of graphene, 10 parts of silicon nitride powder and 10 parts of cobalt oxide into a ball mill, and ball-milling at a rotating speed of 200 revolutions per minute until mixed particles are 200 meshes;
and step 3: putting 15 parts of carbon nano tube, 10 parts of silicon dioxide powder and 10 parts of zinc oxide into a ball mill to perform ball milling at the rotating speed of 300 revolutions per minute until the mixed particles are 200 meshes;
and 4, step 4: putting the mixed powder obtained by grinding the graphene, the silicon nitride powder and the cobalt oxide into a mixed liquid matrix, and then carrying out ultrasonic treatment on the mixed liquid;
and 5: putting mixed powder of carbon nano tubes, silicon dioxide powder and zinc oxide into a mixed liquid matrix, and then stirring the mixed liquid for 1h at the stirring speed of 250 revolutions per minute;
step 6: and then pouring the mixed liquid obtained in the step 5 into a model to obtain the wave-absorbing composite material with the electronic equipment shielding signal.
Example 3:
the embodiment provides a preparation method of a wave-absorbing composite material for shielding signals of electronic equipment, which comprises the following steps (the following parts are calculated by mass):
step 1: mixing 30 parts of resin matrix, 5 parts of dispersant, 5 parts of anti-settling agent and 200 parts of solvent, wherein the solvent is acetone, and stirring for 0.5h at the rotation speed of 300 revolutions per minute to obtain a mixed liquid matrix;
step 2: putting 20 parts of graphene, 10 parts of silicon nitride powder and 10 parts of cobalt oxide into a ball mill, and ball-milling at a rotating speed of 200 revolutions per minute until mixed particles are 300 meshes;
and step 3: putting 20 parts of carbon nano tube, 10 parts of silicon dioxide powder and 10 parts of zinc oxide into a ball mill to perform ball milling at the rotating speed of 300 revolutions per minute until the mixed particles are 300 meshes;
and 4, step 4: putting the mixed powder obtained by grinding the graphene, the silicon nitride powder and the cobalt oxide into a mixed liquid matrix, and then carrying out ultrasonic treatment on the mixed liquid;
and 5: putting mixed powder of carbon nano tubes, silicon dioxide powder and zinc oxide into a mixed liquid matrix, and then stirring the mixed liquid for 0.5h at the stirring speed of 250 revolutions per minute;
step 6: and then pouring the mixed liquid obtained in the step 5 into a model to obtain the wave-absorbing composite material with the electronic equipment shielding signal.
While the invention has been described with reference to specific embodiments, it will be understood by those skilled in the art that the invention is not limited thereto, and may be embodied in other forms without departing from the spirit or essential characteristics thereof. Any modification which does not depart from the functional and structural principles of the present invention is intended to be included within the scope of the claims.
Claims (5)
1. A wave-absorbing composite material for shielding signals of electronic equipment is characterized by comprising the following components in parts by mass
15-30 parts of a resin matrix;
3-7 parts of a dispersing agent;
2-5 parts of an anti-settling agent;
10-20 parts of graphene;
10-20 parts of carbon nano tubes;
5-20 parts of silicon nitride powder;
5-20 parts of silicon dioxide powder;
10-15 parts of cobalt oxide;
10-15 parts of zinc oxide;
100 portions of solvent and 200 portions of solvent.
2. The wave-absorbing composite material for shielding signals of electronic equipment according to claim 1, wherein the dispersant is fatty acid polyethylene glycol ester, and the anti-settling agent is low molecular polyamide.
3. The wave-absorbing composite material for shielding signals of electronic equipment according to claim 1, wherein the solvent is any one of xylene, anhydrous ethanol and acetone, or the volume ratio of xylene, anhydrous ethanol and acetone is 1: 2:1 mixture.
The signal-shielding wave-absorbing composite material for electronic equipment according to claim 1, wherein the ratio of the silicon nitride powder to the silicon dioxide powder is 1: 1.
4. The signal-shielding wave-absorbing composite material for electronic equipment according to claim 1, wherein the matrix resin is any one of polyurethane and epoxy resin.
5. A method for preparing a wave-absorbing composite material for shielding signals of electronic equipment according to any one of claims 1 to 4, comprising the following steps:
step 1: mixing a resin matrix, a dispersing agent, an anti-settling agent and a solvent, and stirring for 0.5h at the rotation speed of 200-300 r/min to obtain a mixed liquid matrix;
step 2: putting the graphene, the silicon nitride powder and the cobalt oxide into a ball mill to perform ball milling at a rotating speed of 200 r/min until the mixed particles are 200-300 meshes;
and step 3: putting the carbon nano tube, the silicon dioxide powder and the zinc oxide into a ball mill to perform ball milling at the rotating speed of 300 r/min until the mixed particles are 200-300 meshes;
and 4, step 4: putting the mixed powder obtained by grinding the graphene, the silicon nitride powder and the cobalt oxide into a mixed liquid matrix, and then carrying out ultrasonic treatment on the mixed liquid;
and 5: putting mixed powder of carbon nano tubes, silicon dioxide powder and zinc oxide into a mixed liquid matrix, and then stirring the mixed liquid for 0.5-1 h at the stirring speed of 150-250 revolutions per minute;
step 6: and then pouring the mixed liquid obtained in the step 5 into a model to obtain the wave-absorbing composite material with the electronic equipment shielding signal.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202010479105.5A CN111606601A (en) | 2020-05-29 | 2020-05-29 | Wave-absorbing composite material for shielding signals of electronic equipment and preparation process thereof |
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| CN202010479105.5A CN111606601A (en) | 2020-05-29 | 2020-05-29 | Wave-absorbing composite material for shielding signals of electronic equipment and preparation process thereof |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112250989A (en) * | 2020-11-05 | 2021-01-22 | 成都佳驰电子科技有限公司 | Wave-absorbing slurry and preparation method of honeycomb wave-absorbing material |
| CN112266593A (en) * | 2020-11-09 | 2021-01-26 | 河南龙都天仁生物材料有限公司 | Degradable biological resin-based wave-absorbing material and preparation method thereof |
| CN117810618A (en) * | 2024-02-29 | 2024-04-02 | 广州市鸿大胶粘制品有限公司 | Corrosion-resistant protective film for lithium battery and preparation method and application thereof |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112250989A (en) * | 2020-11-05 | 2021-01-22 | 成都佳驰电子科技有限公司 | Wave-absorbing slurry and preparation method of honeycomb wave-absorbing material |
| CN112266593A (en) * | 2020-11-09 | 2021-01-26 | 河南龙都天仁生物材料有限公司 | Degradable biological resin-based wave-absorbing material and preparation method thereof |
| CN117810618A (en) * | 2024-02-29 | 2024-04-02 | 广州市鸿大胶粘制品有限公司 | Corrosion-resistant protective film for lithium battery and preparation method and application thereof |
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Application publication date: 20200901 |