CN113208813A - Noise reduction earplug - Google Patents
Noise reduction earplug Download PDFInfo
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- CN113208813A CN113208813A CN202110341240.8A CN202110341240A CN113208813A CN 113208813 A CN113208813 A CN 113208813A CN 202110341240 A CN202110341240 A CN 202110341240A CN 113208813 A CN113208813 A CN 113208813A
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- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61F—FILTERS IMPLANTABLE INTO BLOOD VESSELS; PROSTHESES; DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF, TUBULAR STRUCTURES OF THE BODY, e.g. STENTS; ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES; FOMENTATION; TREATMENT OR PROTECTION OF EYES OR EARS; BANDAGES, DRESSINGS OR ABSORBENT PADS; FIRST-AID KITS
- A61F11/00—Methods or devices for treatment of the ears or hearing sense; Non-electric hearing aids; Methods or devices for enabling ear patients to achieve auditory perception through physiological senses other than hearing sense; Protective devices for the ears, carried on the body or in the hand
- A61F11/06—Protective devices for the ears
- A61F11/08—Protective devices for the ears internal, e.g. earplugs
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- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01B—NON-METALLIC ELEMENTS; COMPOUNDS THEREOF; METALLOIDS OR COMPOUNDS THEREOF NOT COVERED BY SUBCLASS C01C
- C01B32/00—Carbon; Compounds thereof
- C01B32/15—Nano-sized carbon materials
- C01B32/182—Graphene
- C01B32/184—Preparation
- C01B32/186—Preparation by chemical vapour deposition [CVD]
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Abstract
The invention discloses a noise reduction earplug, which comprises a shell, wherein the shell comprises a substrate and a graphene coating coated on the outer side of the substrate; the sound absorption material is filled in the shell. The invention improves the defects of easy aging and easy deformation of the traditional noise reduction earplug to a certain extent, can obviously improve the noise reduction performance of the earplug, and provides possibility for the application of the graphene film material in daily life.
Description
Technical Field
The invention relates to an earplug, in particular to a noise reduction earplug.
Background
Graphene, a two-dimensional thin film material, has been long paid attention to by researchers due to its unique electrical, optical and mechanical properties. The graphene is only sp2The honeycomb type two-dimensional material composed of hybridized carbon atoms has excellent performances of high transmittance, high conductivity, ultrahigh mechanical strength, large specific surface area and the like, so that the honeycomb type two-dimensional material has very wide prospects in the fields of energy, materials, microelectronic devices and aviation. Researchers find that the chemical vapor deposition method for preparing the graphene film is one of the most effective and commonly used methods at present, and the prepared graphene not only can well retain various characteristics of a two-dimensional material, but also is more excellent in mechanical properties, optical properties and the like than other preparation methods.
The traditional noise-reducing earplug generally only uses various organic foam materials as a sound-absorbing noise-reducing inner core of the earplug, and has no effective wrapping supporting layer part, so that the phenomenon of inner core aging, deformation and even breakage easily occurs under the condition of long-term use. Wrapping up the PET layer that the one deck has graphite alkene film material outside traditional polyurethane sound absorption foam, can effectively reduce earplug deformation degree and improve the noise reduction effect, make graphite alkene film can obtain the application to a certain extent simultaneously.
Disclosure of Invention
Aiming at the prior art, the invention provides a noise reduction earplug, which aims to solve the problems that the existing earplug is poor in noise reduction effect and easy to break.
In order to achieve the purpose, the invention adopts the technical scheme that: the noise reduction earplug comprises a shell, wherein the shell comprises a substrate and a graphene coating wrapping the outer side of the substrate; the sound absorption material is filled in the shell.
The invention adopts the technical scheme that the beneficial effects are as follows: the noise reduction earplug takes the shell as the supporting layer, is not easy to deform under the action of external force, can keep the appearance shape for a long time, and protects the internal suction material from being damaged. The shell comprises a substrate and a graphene coating, the graphene coating coats the shell, the earplug can be prevented from aging and deforming, the graphene coating can be effectively isolated from the structure due to a special structure, and finally the obtained earplug noise reduction effect is obvious.
On the basis of the technical scheme, the invention can be further improved as follows.
Further, the shell shape is the same as the ear canal contour.
The invention adopts the further technical scheme that the beneficial effects are as follows: set the shell shape to the profile with the duct the same, the shell is inseparabler with the duct laminating, and noise control effect is better not only, wears also more comfortablely moreover.
Further, the sound-absorbing material is polyurethane foam.
The invention adopts the further technical scheme that the beneficial effects are as follows: the polyurethane foam is a porous sound absorption material, has a high sound absorption coefficient, can effectively absorb noise, is mutually matched with the shell, and has a better noise reduction effect.
Further, the substrate is PET.
Further, the shell is prepared by the following steps:
s1: putting a metal substrate into a roller chamber of a roll-to-roll tube type vacuum furnace, and annealing the metal substrate;
s2: after annealing is finished, pumping the pressure in a roller chamber to be below 1Pa, introducing a graphene growth atmosphere until the pressure in the roller chamber is stabilized at 95-110 Pa, then raising the temperature in the roller chamber to 1000-1100 ℃ within 60min, preserving the temperature for 15-25 min, then rolling a metal substrate at a linear speed of 18-22 mm/min at the temperature, and growing a graphene film on the surface of the metal substrate to obtain a graphene film base material;
s3: sequentially cleaning the graphene film substrate with deionized water, ethanol and acetone, and then blowing inert gas to dry;
s4: coating PMMA (polymethyl methacrylate) on one side of the graphene film substrate treated by S3, and then contacting the side, which is not coated with PMMA, of the graphene film substrate with an etching solution until the metal base is completely dissolved, so as to leave a graphene film and a PMMA glue layer;
s5: fishing out the graphene film and the PMMA adhesive layer by using a substrate, attaching the graphene film and the PMMA adhesive layer to the surface of the substrate, cleaning by using deionized water, and drying by adopting a gradient heating mode; the gradient heating mode is that the temperature is continuously raised to 70 ℃, and then the temperature is kept for 5min every time the temperature is raised to 5 ℃ until the temperature is raised to 100 ℃;
s6: soaking the material treated by the S5 in an acetone solution for 10-20 min, then fishing out, cleaning and drying to obtain a primary product;
s7: making the primary product into shell shape.
The invention adopts the further technical scheme that the beneficial effects are as follows: in the preparation process, the metal substrate is annealed firstly, the annealed metal substrate has strong reaction activity, the graphene can be catalyzed to crack in the growth atmosphere during the subsequent graphene growth, and the generated free carbon atoms are attached to the metal substrate to form the graphene film with uniform thickness. According to the invention, the PMMA is adopted to coat the graphene film substrate, the acting force between PMMA and graphene is strong, the PMMA can be easily spin-coated on the graphene growing on any substrate and transferred to any required substrate, and the graphene can be removed by soaking in acetone after transfer, so that the operation is very convenient. In addition, the graphene film and the PMMA glue layer fished out by the substrate are fished out and dried by adopting a temperature programming mode, the temperature can be uniformly raised to the target temperature, the quality of the graphene film is higher, and if the temperature raising rate is too high, the water evaporation rate on the cleaned graphene film is high, bubbles are easy to generate, and the graphene which is not dried and is not tightly attached to the substrate is damaged.
Further, the annealing of the metal substrate in S1 includes the steps of: firstly, pumping the pressure in the roller chamber to be less than 1Pa, and then introducing H2And Ar until the pressure in the roller cavity is stabilized at 75-85 Pa, raising the temperature in the roller cavity to 1000-1100 ℃ within 60min, preserving the temperature for 15-25 min, and then rolling the metal substrate at the temperature at a linear speed of 20mm/min to finish the annealing process; h2H in mixed gas with Ar2Is 5% by volume.
The invention adopts the further technical scheme that the beneficial effects are as follows: the invention uses H in the annealing stage2And the mixed gas of Ar is used as a protective gas, so that the metal substrate can be prevented from being oxidized at high temperature and losing the catalytic action.
Further, the metal substrate is a copper foil, and the etching solution is a ferric chloride solution.
Further, the graphene growth atmosphere comprises H with the flow rate of 100sccm2Mixed gas of/Ar and CH with the flow rate of 20sccm4A mixed gas of/Ar; h2H in the mixed gas of/Ar2Volume fraction of (2) is 5%, CH4CH in/Ar mixed gas4Is 1% by volume.
The invention adopts the further technical scheme that the beneficial effects are as follows: the graphene growth atmosphere used in the preparation process comprises CH4，CH4More free carbon atoms can be formed after cracking, and the graphene film can be rapidly and uniformly deposited on the surface of a metal substrate to form a stable graphene film layer. CH (CH)4The cleavage reaction is as follows.
Further, after the graphene growth atmosphere is introduced in S2, the pressure in the roller chamber is stabilized at 100Pa, and the linear speed of the metal substrate rolling is 20 mm/min.
The invention has the beneficial effects that: the method is simple to operate and low in cost, and the high-quality graphene film-coated noise-reducing earplugs can be prepared in a large scale; the defect that a traditional noise reduction earplug is easy to age and deform is overcome to a certain extent, the noise reduction performance of the earplug can be remarkably improved, and the possibility is provided for the application of a graphene film material in daily life.
Drawings
FIG. 1 is a front view of a noise reducing earplug of the invention;
FIG. 2 is a top view of a noise reducing earplug of the invention;
wherein, 1, a shell; 11. a substrate; 12. a graphene coating; 2. a sound absorbing material.
Detailed Description
The following detailed description of embodiments of the invention refers to the accompanying drawings.
In one embodiment of the present invention, as shown in FIGS. 1-2, a noise reducing earplug is provided. The noise reduction earplug comprises a shell 1, wherein the shell 1 comprises a substrate 11 and a graphene coating 12 coated outside the substrate 11. The shell 1 of the present invention is made of a material having a certain strength and a good sound absorption effect, and in a preferred embodiment of the present invention, the shell 1 is made by the following steps:
s1: putting a metal substrate into a roller chamber of a roll-to-roll tube type vacuum furnace, and annealing the metal substrate; the metal substrate can be copper foil, nickel foil, copper alloy foil and the like, and the specific method of annealing treatment comprises the following steps: firstly, the pressure in the roller chamber is pumped to be less than 1Pa, and then H with the flow rate of 100sccm is introduced2And Ar until the pressure in the roller cavity is stabilized at about 80Pa, raising the temperature in the roller cavity to about 1050 ℃ within 60min, preserving the temperature for 15-25 min, and then rolling the metal substrate at the temperature at a linear speed of 20mm/min to finish the annealing process; h2H in mixed gas with Ar2Is 5% by volume;
s2: after annealing is finished, pumping the pressure in the roller cavity to be below 1Pa, introducing graphene growing atmosphere until the pressure in the roller cavity is stabilized at about 100Pa, then raising the temperature in the roller cavity to about 1050 ℃ within 60min, preserving the temperature for 15-25 min, then rolling the metal substrate at the temperature at a linear speed of about 20mm/min, and growing a graphene film on the surface of the metal substrate to obtain a graphene film base material; the graphene growth atmosphere comprises H with the flow rate of 100sccm2Mixed gas of/Ar and CH with the flow rate of 20sccm4A mixed gas of/Ar; h2H in the mixed gas of/Ar2Volume fraction of (2) is 5%, CH4CH in/Ar mixed gas4Is 1% by volume.
S3: sequentially cleaning the graphene film substrate with deionized water, ethanol and acetone, and then blowing inert gas to dry;
s4: coating PMMA (polymethyl methacrylate) on one side of the graphene film substrate treated by S3, and then contacting the side, which is not coated with PMMA, of the graphene film substrate with an etching solution until the metal base is completely dissolved, so as to leave a graphene film and a PMMA glue layer; the etching solution is a solution capable of dissolving the metal substrate, for example, when the metal substrate is a copper foil, the etching solution is a ferric chloride solution;
s5: fishing out the graphene film and the PMMA adhesive layer by using a substrate, attaching the graphene film and the PMMA adhesive layer to the surface of the substrate, cleaning by using deionized water, and drying by adopting a gradient heating mode; the gradient heating mode is that the temperature is continuously raised to 70 ℃, and then the temperature is kept for 5min every time the temperature is raised to 5 ℃ until the temperature is raised to 100 ℃; the substrate is made of a material with certain strength and good toughness, such as PET and the like;
s6: soaking the material treated by the S5 in an acetone solution for 10-20 min, then fishing out, cleaning and drying to obtain a primary product;
s7: making the primary product into auditory canal contour shape.
After the outer shell 1 is manufactured, an open-cell type foam material such as urethane foam is taken as the sound absorbing material 2, and cut into a shape matching the outer shell 1, and then the cut sound absorbing material is packed into the outer shell 1. I.e. to form a complete noise reducing earplug.
While the present invention has been described in detail with reference to the illustrated embodiments, it should not be construed as limited to the scope of the present patent. Various modifications and changes may be made by those skilled in the art without inventive step within the scope of the appended claims.
Claims (9)
1. A noise reducing earplug, comprising: the graphene composite material comprises a shell (1), wherein the shell (1) comprises a substrate (11) and a graphene coating (12) wrapping the outside of the substrate (11); the sound absorption material (2) is filled in the shell (1).
2. The noise reducing earplug of claim 1, wherein: the shell (1) is shaped to conform to the contours of the ear canal.
3. The noise reducing earplug of claim 1, wherein: the sound-absorbing material (2) is polyurethane foam.
4. The noise reducing earplug of claim 1, wherein: the substrate (11) is PET.
5. The noise reducing earplug according to claim 1, wherein the shell (1) is made by:
s1: putting a metal substrate into a roller chamber of a roll-to-roll tube type vacuum furnace, and annealing the metal substrate;
s2: after annealing is finished, pumping the pressure in a roller chamber to be below 1Pa, introducing a graphene growth atmosphere until the pressure in the roller chamber is stabilized at 95-110 Pa, then raising the temperature in the roller chamber to 1000-1100 ℃ within 60min, preserving the temperature for 15-25 min, then rolling a metal substrate at a linear speed of 18-22 mm/min at the temperature, and growing a graphene film on the surface of the metal substrate to obtain a graphene film base material;
s3: sequentially cleaning the graphene film substrate with deionized water, ethanol and acetone, and then blowing inert gas to dry;
s4: coating PMMA (polymethyl methacrylate) on one side of the graphene film substrate treated by S3, and then contacting the side, which is not coated with PMMA, of the graphene film substrate with an etching solution until the metal base is completely dissolved, so as to leave a graphene film and a PMMA glue layer;
s5: fishing out the graphene film and the PMMA adhesive layer by using a substrate, attaching the graphene film and the PMMA adhesive layer to the surface of the substrate, cleaning by using deionized water, and drying by adopting a gradient heating mode; the gradient heating mode is that the temperature is continuously raised to 70 ℃, and then the temperature is kept for 5min every time the temperature is raised to 5 ℃ until the temperature is raised to 100 ℃;
s6: soaking the material treated by the S5 in an acetone solution for 10-20 min, then fishing out, cleaning and drying to obtain a primary product;
s7: making the primary product into shell shape.
6. The noise reducing earplug according to claim 5, wherein the annealing of the metal substrate in S1 comprises the steps of: firstly, pumping the pressure in the roller chamber to be less than 1Pa, and then introducing H2And Ar until the pressure in the roller cavity is stabilized at 75-85 Pa, raising the temperature in the roller cavity to 1000-1100 ℃ within 60min, preserving the temperature for 15-25 min, and then rolling the metal substrate at the temperature at a linear speed of 20mm/min to finish the annealing process; said H2H in mixed gas with Ar2Is 5% by volume.
7. The noise reducing earplug of claim 5, wherein: the metal substrate is a copper foil, and the etching solution is a ferric chloride solution.
8. The noise reducing earplug of claim 5, wherein: the graphene growth atmosphere comprises H with the flow rate of 100sccm2Mixed gas of/Ar and CH with the flow rate of 20sccm4A mixed gas of/Ar; h2H in the mixed gas of/Ar2Volume fraction of (2) is 5%, CH4CH in/Ar mixed gas4Is 1% by volume.
9. The noise reducing earplug of claim 5, wherein: and (S2), introducing a graphene growth atmosphere, stabilizing the pressure in the roller chamber at 100Pa, and rolling the metal substrate at a linear speed of 20 mm/min.
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| CN202110341240.8A CN113208813A (en) | 2021-03-30 | 2021-03-30 | Noise reduction earplug |
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| CN202110341240.8A CN113208813A (en) | 2021-03-30 | 2021-03-30 | Noise reduction earplug |
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Citations (15)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN203861440U (en) * | 2014-02-28 | 2014-10-08 | 上海工程技术大学 | Soundproof earplug with hydrogel coating |
| CN104168523A (en) * | 2014-08-04 | 2014-11-26 | 薛峰 | Noise-reduction earphone based on graphene foam |
| CN205017541U (en) * | 2015-10-28 | 2016-02-03 | 常州阿木奇声学科技有限公司 | Graphite alkene in -ear earphone |
| CN105752965A (en) * | 2016-01-26 | 2016-07-13 | 无锡格菲电子薄膜科技有限公司 | Etching method for directly forming multi-layer graphene film in graphene prepared through CVD method |
| CN106176042A (en) * | 2016-07-07 | 2016-12-07 | 江苏亿欣新材料科技股份有限公司 | A kind of double acoustic insulating ear plug |
| CN106946551A (en) * | 2017-03-10 | 2017-07-14 | 江南大学 | A kind of graphene/carbon nano-tube strengthens the preparation method of alumina ceramic coating |
| CN106963554A (en) * | 2017-04-24 | 2017-07-21 | 杨霖 | Graphene hearing protectors |
| CN107443845A (en) * | 2017-08-02 | 2017-12-08 | 武汉工程大学 | A kind of soft or hard alternately stratiform noise reduction high polymer material and preparation method thereof |
| CN207117886U (en) * | 2017-07-10 | 2018-03-16 | 吉安县瑞丰达电子有限公司 | A kind of sound insulation and noise reduction earphone |
| KR101922898B1 (en) * | 2017-08-14 | 2018-11-29 | 주식회사 참트론 | Heat-generating head-phone and earplug |
| CN109729465A (en) * | 2017-10-29 | 2019-05-07 | 黄晓凤 | A kind of noise-proofing formula earphone |
| CN109879277A (en) * | 2019-04-16 | 2019-06-14 | 电子科技大学 | A kind of graphene cleaning transfer method |
| CN110747580A (en) * | 2019-11-04 | 2020-02-04 | 邦威防护科技股份有限公司 | Preparation method of graphene heating fabric |
| CN110872371A (en) * | 2018-09-04 | 2020-03-10 | 乐腾达(深圳)日用品有限公司 | Preparation method of slow-resilience sponge earplug adopting Z15 sound-absorbing particles |
| CN112093794A (en) * | 2020-09-09 | 2020-12-18 | 长沙新材料产业研究院有限公司 | Graphene optical drive material and preparation method thereof |
-
2021
- 2021-03-30 CN CN202110341240.8A patent/CN113208813A/en active Pending
Patent Citations (15)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN203861440U (en) * | 2014-02-28 | 2014-10-08 | 上海工程技术大学 | Soundproof earplug with hydrogel coating |
| CN104168523A (en) * | 2014-08-04 | 2014-11-26 | 薛峰 | Noise-reduction earphone based on graphene foam |
| CN205017541U (en) * | 2015-10-28 | 2016-02-03 | 常州阿木奇声学科技有限公司 | Graphite alkene in -ear earphone |
| CN105752965A (en) * | 2016-01-26 | 2016-07-13 | 无锡格菲电子薄膜科技有限公司 | Etching method for directly forming multi-layer graphene film in graphene prepared through CVD method |
| CN106176042A (en) * | 2016-07-07 | 2016-12-07 | 江苏亿欣新材料科技股份有限公司 | A kind of double acoustic insulating ear plug |
| CN106946551A (en) * | 2017-03-10 | 2017-07-14 | 江南大学 | A kind of graphene/carbon nano-tube strengthens the preparation method of alumina ceramic coating |
| CN106963554A (en) * | 2017-04-24 | 2017-07-21 | 杨霖 | Graphene hearing protectors |
| CN207117886U (en) * | 2017-07-10 | 2018-03-16 | 吉安县瑞丰达电子有限公司 | A kind of sound insulation and noise reduction earphone |
| CN107443845A (en) * | 2017-08-02 | 2017-12-08 | 武汉工程大学 | A kind of soft or hard alternately stratiform noise reduction high polymer material and preparation method thereof |
| KR101922898B1 (en) * | 2017-08-14 | 2018-11-29 | 주식회사 참트론 | Heat-generating head-phone and earplug |
| CN109729465A (en) * | 2017-10-29 | 2019-05-07 | 黄晓凤 | A kind of noise-proofing formula earphone |
| CN110872371A (en) * | 2018-09-04 | 2020-03-10 | 乐腾达(深圳)日用品有限公司 | Preparation method of slow-resilience sponge earplug adopting Z15 sound-absorbing particles |
| CN109879277A (en) * | 2019-04-16 | 2019-06-14 | 电子科技大学 | A kind of graphene cleaning transfer method |
| CN110747580A (en) * | 2019-11-04 | 2020-02-04 | 邦威防护科技股份有限公司 | Preparation method of graphene heating fabric |
| CN112093794A (en) * | 2020-09-09 | 2020-12-18 | 长沙新材料产业研究院有限公司 | Graphene optical drive material and preparation method thereof |
Non-Patent Citations (3)
| Title |
|---|
| 冯涛: "石墨烯的组织性能、改性处理及应用前景", 《功能材料》 * |
| 梁李斯等: "新型吸声材料及吸声模型研究进展", 《功能材料》 * |
| 王浪等: "化学气相沉积法制备石墨烯的铜衬底预处理研究", 《物理学报》 * |
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Application publication date: 20210806 |