Hearing aid and preparation method thereof

Abstract

The embodiment of the invention provides a hearing aid and a preparation method thereof, a waterproof coating is formed on at least a part of the surface of the hearing aid, the waterproof coating comprises a hydrophobic layer, the hydrophobic layer is formed by plasma polymerization including siloxane monomers, the hydrophobic layer has a protection effect on the hearing aid, and the waterproof coating can be applied to the hearing aid. Therefore, the hearing aid has good hydrophobicity, salt mist resistance, damp heat resistance, thermal shock resistance and the like.

Description

Technical Field

[0001] The present invention relates to the field of hearing aids, and in particular to a hearing aid and a preparation method thereof. Background Art

[0002] Hearing aids are required to be resistant to water and sweat, salt spray, humidity and heat, thermal shock, and have excellent hydrophobic properties, so hearing aids need to be protected.

[0003] One protection method is to use structural protection. Structural protection mainly uses waterproof strips, rubber plugs, silicone rings, sealants, etc. to form a closed system to isolate components such as printed circuit boards from the outside, making it difficult for liquids to enter the interior and contact the circuit boards, thereby protecting the hearing aids from normal use. However, when the hearing aid is dropped, impacted, or vibrated, the structure may deform, resulting in a decrease in protective performance; on the other hand, structural protection will increase the overall volume of the hearing aid.

[0004] One protection method is the three-conformal paint protection, which is directly applied to the surface of electronic products by brushing, spraying, and immersion. After the internal cross-linking of molecules and the volatilization of solvents, a polymer film protective coating is formed. The thickness of the three-conformal paint coating is generally 1-50μm. In practical applications, some electronic devices that require heat dissipation and signal transmission will be hindered by micron-level coatings, including electronic signal loss and increased contact position impedance.

[0005] Therefore, it is necessary to develop a new hearing aid with good protective effect. Summary of the invention

[0006] An embodiment of the present invention provides a hearing aid, wherein a waterproof coating is formed on at least part of the surface of the hearing aid, wherein the waterproof coating includes a hydrophobic layer, and the hydrophobic layer is a plasma polymerized coating formed by a plasma including a monomer α; the monomer α is a siloxane monomer, and the siloxane monomer includes one or more of a linear siloxane monomer or a cyclic siloxane monomer.

[0007] In some embodiments, the monomer α comprises at least one of the structures shown in the following formula (1) or (2),

[0008]

[0009] In formula (1) or (2), R7, R8, R9, R 11 and R 12 are independently selected from hydrogen atoms, C1-C 12 Substituted or unsubstituted hydrocarbon groups, C1-C 12 Substituted or unsubstituted alkoxy, C1-C 12substituted or unsubstituted hydrocarbon silyloxy, methacryloyloxy, substituted or unsubstituted amino, substituted or unsubstituted amine, nitrile, aryl, or halogen atom, at least one of R7, R8 and R9 is not a hydrogen atom, and R 11 or R 12 At least one of them is not a hydrogen atom, R 10 C1-C 12 Substituted or unsubstituted hydrocarbon group, or C1-C 12 A substituted or unsubstituted hydrocarbon silicon group, n is an integer of 1-100, and m is an integer of 3-10.

[0010] In some embodiments, R7, R8, R9, R 11 and R 12 are independently selected from methyl, ethyl or halogen atoms, and the R 10 is methyl, ethyl or halogen-substituted dimethylsilyl, and n is an integer of 1-10.

[0011] In some embodiments, the monomer α is selected from the group consisting of diphenyldimethoxysilane, methyl orthosilicate, ethyl orthosilicate, diethylaminomethyltriethoxysilane, diethylenetriaminopropyltrimethoxysilane, 1,1,1-trimethyl-N-2-propylenepropylaminosilane, bis[3-(trimethoxysilyl)propyl]ethylenediamine, pentamethyldisiloxane, hexamethyldisiloxane, hexamethoxydisiloxane, hexaphenyldisiloxane, vinylpentamethyldisiloxane, 1-vinyl-1,1,3,3-tetramethyldisiloxane, 1,3-octyltetramethyldisiloxane, 1,1,3,3-tetramethyl-1,3-diphenyldisiloxane, 1,1,3,3-tetramethyldisiloxane, 1,3-divinyl Tetramethyldisiloxane, 1,3-bis(chloromethyl)tetramethyldisiloxane, 1,3-dichlorotetramethyldisiloxane, 1,3-bis(4-hydroxybutyl)tetramethyldisiloxane, 1,3-bis(3-cyanopropyl)tetramethyldisiloxane, 1,3-dimethyltetravinyldisiloxane, 1,3-dimethoxy-1,1,3,3-tetramethyldisiloxane, 1,1,1,3,3,5,5-heptamethyltrisiloxane, 1,1,1,3,5,5,5-heptamethyltrisiloxane, 1,1,5,5-tetramethyl-3,3-diphenyltrisiloxane, 1,1,3,3,5,5-hexamethyltrisiloxane, octamethyltrisiloxane, decamethyltetrasiloxane, dodecamethylpentasiloxane, decamethyl Methyldihydrogenpentasiloxane, tetradecamethylhexasiloxane, hexadecylheptasiloxane, polydimethylsiloxane, polymethylhydrogensiloxane, polydimethylsiloxane hydride terminated, polyphenylmethylsiloxane, vinyl terminated dimethylpolysiloxane, phenyltri(trimethylsiloxy)silane, vinyltri(trimethylsiloxy)silane, methyltri(trimethylsiloxy)silane, ethyltri(trimethylsiloxy)silane, 1,3-diphenyl-1,3-bis(trimethylsiloxy)disiloxane, allyltri(trimethylsiloxy)silane, tetra(trimethylsiloxy)silane, (3-chloropropyl)tri(trimethylsiloxy)silane, methacryloxypropyltri(trimethylsiloxy)silane, hexamethylcyclohexane One or more of trisiloxane, hexaethylcyclotrisiloxane, hexaphenylcyclotrisiloxane, 2,4,6-triethyl-2,4,6-trimethylcyclotrisiloxane, 2,4,6-trimethylcyclotrisiloxane, trimethyl-1,3,5-triphenylcyclotrisiloxane, octamethylcyclotetrasiloxane, octaphenylcyclotetrasiloxane, decamethylcyclopentasiloxane, 1,3,5,7-tetramethylcyclotetrasiloxane, 2,4,6,8-tetramethylcyclotetrasiloxane, decamethylcyclopentasiloxane, pentamethylpentavinylcyclopentasiloxane, 2,4,6,8,10-pentamethylcyclopentasiloxane, dodecamethylcyclohexasiloxane, hexamethylhexavinylcyclohexasiloxane, hexadecylcyclooctylsiloxane, or octadecylcyclononasiloxane.

[0012] In some embodiments, the monomer α is selected from one or more of dodecamethylcyclohexasiloxane, hexaethylcyclotrisiloxane, 1,3-dichlorotetramethyldisiloxane, 1,3-diphenyl-1,3-bis(trimethylsiloxy)disiloxane and 2,4,6-triethyl-2,4,6-trimethylcyclotrisiloxane.

[0013] In some embodiments, the hydrophobic layer is a plasma polymerized coating formed by plasma containing the monomer α and the monomer β; the monomer β has a structure shown in formula (3),

[0014]

[0015] In formula (3), S1 contains one or more -OC(O)- or -C(O)-O-, and R1, R2, R3, R4, R5 and R6 are independently selected from hydrogen atoms, halogen atoms, C1-C 10 Alkyl or C1-C 10 The halogen atom replaces the alkyl group.

[0016] In some embodiments, the monomer β is selected from at least one of 1,4-butanediol dimethacrylate, 1,6-hexanediol dimethacrylate, ethylene glycol dimethacrylate, diethylene glycol dimethacrylate, triethylene glycol dimethacrylate, tetraethylene glycol dimethacrylate, 1,3-butanediol dimethacrylate, neopentyl glycol dimethacrylate, methacrylic anhydride, dipropylene-2-enyl-2-methylenesuccinate, dipropylene-2-enyl 2-benzylidenemalonate, or diethyl diallylmalonate.

[0017] In some embodiments, the molar ratio of the monomer α to the monomer β is 1:5 to 5:1.

[0018] In some embodiments, the waterproof coating further comprises: a protective layer formed on at least a portion of the surface of the hearing aid, the protective layer being located between at least a portion of the surface of the hearing aid and the hydrophobic layer, the protective layer being a plasma-polymerized coating formed by contacting at least a portion of the surface of the hearing aid with a plasma containing monomer γ and monomer δ, and the hydrophobic layer being a plasma-polymerized coating formed by contacting the protective layer formed on at least a portion of the surface of the hearing aid with a plasma containing the monomer α and the monomer β;

[0019] The monomer γ has a structure shown in formula (4),

[0020]

[0021] In formula (4), R 13 is selected from CH or C3-C8 cycloalkyl, R 14 , R15 and R 16 are independently selected from a connecting bond or a C1-C6 alkylene group, and the R 14 and R 15 When they are all connecting bonds, they are not connected to the same carbon atom, A is the connecting part, and B contains a carbon-carbon unsaturated bond or an epoxy structure;

[0022] The monomer δ has a structure shown in formula (5),

[0023]

[0024] In formula (5), S2 includes one or more -OC(O)- or -C(O)-O-, R 17 , R 18 , R 19 , R 20 , R 21 and R 22 are independently selected from hydrogen atoms, halogen atoms, C1-C 10 Alkyl or C1-C 10 The halogen atom replaces the alkyl group.

[0025] In some embodiments, the molar ratio of the monomer γ to the monomer δ is 1:3 to 3:1.

[0026] In some embodiments, A is -OC(O)- or -C(O)-O-.

[0027] In some embodiments, the monomer γ has a structure shown in formula (6),

[0028]

[0029] In formula (6), R 23 , R 24 and R 25 are independently selected from hydrogen atoms, halogen atoms, C1-C 10 Alkyl or C1-C 10 The halogen atom replaces the alkyl group.

[0030] In some embodiments, R1, R2, R3, R4, R5, R6, R 17 , R 18 , R 19 , R 20 , R 21 , R 22 , R 23 , R 24 and R 25 are independently selected from a hydrogen atom or a methyl group.

[0031] In some embodiments, the monomer γ is selected from: one or more of: glycidyl methacrylate, tetrahydrofurfuryl acrylate, 3,4-epoxycyclohexyl methyl-3,4-epoxycyclohexyl carboxylate, 3,4-epoxycyclohexyl methacrylate, 3,4-epoxycyclohexyl methyl methacrylate, 1,2-epoxy-4-vinylcyclohexane, bis(2,3-epoxycyclopentyl) ether, 2,3-epoxycyclopentylcyclopentyl ether, vinylcyclohexene diepoxide, diisoprene diepoxide or bis((3,4-epoxycyclohexyl)methyl)adipate.

[0032] In some embodiments, the S1 and / or S2 contain two -OC(O)- or -C(O)-O-.

[0033] In some embodiments, S1 has a structure as shown in formula (7),

[0034]

[0035] In formula (7), R 26 C2-C 10 Alkylene or C2-C 10 The alkylene group is substituted with a halogen atom, and x is an integer from 0 to 10.

[0036] In some embodiments, S2 has a structure as shown in formula (8),

[0037]

[0038] In formula (8), R 27 C2-C 10 Alkylene or C2-C 10 The halogen atom-substituted alkylene group is substituted with y, and y is an integer from 0 to 10.

[0039] In some embodiments, the monomer δ is selected from at least one of 1,4-butylene glycol dimethacrylate, 1,6-hexanediol dimethacrylate, ethylene glycol dimethacrylate, diethylene glycol dimethacrylate, triethylene glycol dimethacrylate, tetraethylene glycol dimethacrylate, 1,3-butylene glycol dimethacrylate, neopentyl glycol dimethacrylate, methacrylic anhydride, dipropylene-2-enyl-2-methylenesuccinate, dipropylene-2-enyl 2-benzylidenemalonate, or diethyl diallylmalonate.

[0040] In some embodiments, the waterproof coating has a thickness of 1 mm to 10 μm.

[0041] In some embodiments, the water contact angle of the waterproof coating is above 100°.

[0042] In some embodiments, after the hearing aid is placed in an environment with a temperature of 85° C. and a relative humidity of 85% RH for 144 hours, the water contact angle of the waterproof coating is above 90°.

[0043] In some embodiments, the hearing aid is placed in a test chamber at a temperature of 38°C, a relative humidity of 50%RH, a black mark temperature of 65°C, and an irradiance of 0.51W / (m 2 ·nm), and a radiation wavelength of 340nm were used for 60 dry-wet cycles of exposure to a xenon arc lamp, with a drying time of 102 minutes and a water spraying time of 18 minutes for each dry-wet cycle. After 60 dry-wet cycles, the water contact angle of the waterproof coating was above 90°.

[0044] In some embodiments, the hearing aid is subjected to accelerated environmental test A, which includes a salt spray test according to IEC 60068-2-11, a cyclic damp heat test according to IEC 60068-2-30, and a temperature change test according to IEC60068-2-14. After three times of the accelerated environmental test A, the hearing aid has a hearing aid function.

[0045] In some embodiments, after undergoing the accelerated environment test A for 6 times, the hearing aid has a hearing aid function.

[0046] In some embodiments, the hearing aid is subjected to an accelerated environmental test B, which includes: an immersion test, a sweat spray test, and a sweat atmosphere test. After the immersion test, the hearing aid has a hearing aid function, after the sweat spray test, the hearing aid has a hearing aid function, and after the sweat atmosphere test, the hearing aid has a hearing aid function.

[0047] An embodiment of the present invention also provides a method for preparing a hearing aid, the method comprising: providing a hearing aid, placing the hearing aid in a plasma reaction chamber, evacuating the chamber to 20 to 200 mTorr, and introducing one or more of helium, argon or oxygen; introducing vapor including monomer α into the reaction chamber, starting plasma discharge, and forming a hydrophobic layer on at least a portion of the surface of the hearing aid.

[0048] In some embodiments, introducing the vapor including the monomer α into the reaction chamber includes: introducing mixed monomer vapor including the monomer α and the monomer β into the reaction chamber.

[0049] In some embodiments, the preparation method includes: introducing a mixed monomer vapor containing monomer γ and monomer δ into a reaction chamber, starting plasma discharge, and forming a protective layer on at least a portion of the surface of the hearing aid; introducing a mixed monomer vapor containing the monomer α and the monomer β into a reaction chamber, starting plasma discharge, and forming the hydrophobic layer on the protective layer.

[0050] In some embodiments, the plasma discharge is performed by pulse discharge, with a pulse power of 10W to 500W, a pulse frequency of 10Hz to 10kHz, a pulse duty cycle of 1% to 85%, and a plasma discharge time of 100s to 36000s.

[0051] Compared with the prior art, the technical solution of the embodiment of the present invention has the following beneficial effects:

[0052] The hearing aid of an embodiment of the present invention has a waterproof coating formed on at least part of its surface, and the waterproof coating includes a hydrophobic layer, and the hydrophobic layer is formed by plasma polymerization of siloxane monomers. The hydrophobic layer protects the hearing aid, thereby making the hearing aid have good waterproof, moisture-proof and corrosion-resistant properties.

[0053] The hearing aid of an embodiment of the present invention has a waterproof coating formed on at least part of its surface, and the waterproof coating includes a hydrophobic layer, and the hydrophobic layer is formed by plasma polymerization of siloxane monomers and plasma polymerization of ester coupling agent monomers. The hydrophobic layer protects the hearing aid, thereby making the hearing aid have good hydrophobicity, moisture resistance, corrosion resistance, salt spray resistance, moisture and heat resistance, thermal shock resistance and other properties.

[0054] The hearing aid of the embodiment of the present invention has a waterproof coating formed on at least part of its surface, the waterproof coating includes a protective layer and a hydrophobic layer formed on the protective layer, the protective layer is formed by plasma polymerization of an ester monomer containing an epoxy structure and an ester coupling agent, and the hydrophobic layer is formed by plasma polymerization of a siloxane monomer and an ester coupling agent. The hearing aid has good hydrophobicity, moisture resistance and corrosion resistance. Compared with a hearing aid with a waterproof coating composed only of a hydrophobic layer, the hearing aid has better salt spray resistance, moisture resistance, thermal shock resistance and other properties. After 10 cycles of the hearing aid product accelerated environmental test A, the hearing aid product still functions normally. DETAILED DESCRIPTION

[0055] An embodiment of the present invention provides a hearing aid, wherein a waterproof coating is formed on at least part of the surface of the hearing aid, wherein the waterproof coating includes a hydrophobic layer, and the hydrophobic layer is a plasma polymerized coating formed by plasma including a monomer α; the monomer α is a siloxane monomer.

[0056] In some specific embodiments of the hearing aid according to the specific embodiments of the present invention, the monomer α is a linear siloxane or a cyclic siloxane.

[0057] In some specific embodiments of the hearing aid of the present invention, the monomer α comprises at least one of the structures shown in the following formula (1) or (2):

[0058]

[0059] In formula (1) or (2), R7, R8, R9, R 11 and R 12 are independently selected from hydrogen atoms, C1-C 12 Substituted or unsubstituted hydrocarbon groups, C1-C 12 Substituted or unsubstituted alkoxy, C1-C 12 substituted or unsubstituted hydrocarbon silyloxy, methacryloyloxy, substituted or unsubstituted amino, substituted or unsubstituted amine, nitrile, aryl, or halogen atom, at least one of R7, R8 and R9 is not a hydrogen atom, and R 11 or R 12 At least one of them is not a hydrogen atom, R 10 C1-C 12 Substituted or unsubstituted hydrocarbon group, or C1-C 12 A substituted or unsubstituted hydrocarbon silicon group, n is an integer of 1 to 100, and m is an integer of 3 to 10. In a specific embodiment of the present invention, the hydrocarbon group may be an alkane group, an alkene group, an alkyne group or an aromatic hydrocarbon group, and the substituent may be, for example, a halogen atom, a hydroxyl group, an acyloxy group, an amine group, a nitrile group or a hydrocarbonoxy group, etc.

[0060] In some specific embodiments, the monomer α is selected from the group consisting of diphenyldimethoxysilane, methyl orthosilicate, ethyl orthosilicate, diethylaminomethyltriethoxysilane, diethylenetriaminopropyltrimethoxysilane, 1,1,1-trimethyl-N-2-propylenepropylaminosilane, bis[3-(trimethoxysilyl)propyl]ethylenediamine, pentamethyldisiloxane, hexamethyldisiloxane, hexamethoxydisiloxane, hexaphenyldisiloxane, vinylpentamethyldisiloxane, 1-vinyl-1,1,3,3-tetramethyldisiloxane, 1,3-octyltetramethyldisiloxane, 1,1,3,3-tetramethyl-1,3-diphenyldisiloxane, 1,1,3,3-tetramethyldisiloxane, 1,3-diethyl Alkenyltetramethyldisiloxane, 1,3-bis(chloromethyl)tetramethyldisiloxane, 1,3-dichlorotetramethyldisiloxane, 1,3-bis(4-hydroxybutyl)tetramethyldisiloxane, 1,3-bis(3-cyanopropyl)tetramethyldisiloxane, 1,3-dimethyltetravinyldisiloxane, 1,3-dimethoxy-1,1,3,3-tetramethyldisiloxane, 1,1,1,3,3,5,5-heptamethyltrisiloxane, 1,1,1,3,5,5,5-heptamethyltrisiloxane, 1,1,5,5-tetramethyl-3,3-diphenyltrisiloxane, 1,1,3,3,5,5-hexamethyltrisiloxane, octamethyltrisiloxane, decamethyltetrasiloxane, dodecamethylpentasiloxane 、Decamethyldihydrogenpentasiloxane, Tetradecamethylhexasiloxane, Hexadecylheptasiloxane, Polydimethylsiloxane, Polymethylhydrogensiloxane, Polydimethylsiloxane hydride terminated, Polyphenylmethylsiloxane, Vinyl terminated dimethylpolysiloxane, Phenyltri(trimethylsiloxy)silane, Vinyltri(trimethylsiloxy)silane, Methyltri(trimethylsiloxy)silane, Ethyltri(trimethylsiloxy)silane, 1,3-Diphenyl-1,3-bis(trimethylsiloxy)disiloxane, Allyltri(trimethylsiloxy)silane, Tetra(trimethylsiloxy)silane, (3-Chloropropyl)tri(trimethylsiloxy)silane, Methacryloxypropyltri(trimethylsiloxy)silane, Hexamethyl One or more of cyclotrisiloxane, hexaethylcyclotrisiloxane, hexaphenylcyclotrisiloxane, 2,4,6-triethyl-2,4,6-trimethylcyclotrisiloxane, 2,4,6-trimethylcyclotrisiloxane, trimethyl-1,3,5-triphenylcyclotrisiloxane, octamethylcyclotetrasiloxane, octaphenylcyclotetrasiloxane, decamethylcyclopentasiloxane, 1,3,5,7-tetramethylcyclotetrasiloxane, 2,4,6,8-tetramethylcyclotetrasiloxane, decamethylcyclopentasiloxane, pentamethylpentavinylcyclopentasiloxane, 2,4,6,8,10-pentamethylcyclopentasiloxane, dodecamethylcyclohexasiloxane, hexamethylhexavinylcyclohexasiloxane, hexadecylcyclooctylsiloxane, or octadecylcyclononasiloxane.

[0061] In some embodiments, taking into account both wear resistance and hydrophobicity, in formula (1) or (2), R7, R8, R9, R 11 and R 12 are independently selected from methyl, ethyl or halogen atoms, and the R 10 is methyl, ethyl or halogen-substituted dimethylsilyl, and n is an integer of 1-10.

[0062] In some specific embodiments, the monomer α is selected from one or more of dodecamethylcyclohexasiloxane, hexaethylcyclotrisiloxane, 1,3-dichlorotetramethyldisiloxane, 1,3-diphenyl-1,3-bis(trimethylsiloxy)disiloxane and 2,4,6-triethyl-2,4,6-trimethylcyclotrisiloxane.

[0063] In some embodiments of the hearing aid of the specific embodiment of the present invention, the hydrophobic layer is a plasma polymerized coating formed by a plasma containing the monomer α and the monomer β; the monomer β has a structure shown in formula (3),

[0064]

[0065] In formula (3), S1 contains one or more -OC(O)- or -C(O)-O-, and R1, R2, R3, R4, R5 and R6 are independently selected from hydrogen atoms, halogen atoms, C1-C 10 Alkyl or C1-C 10 The halogen atom replaces the alkyl group; for C1-C 10 Alkyl or C1-C 10 The alkyl group includes a straight-chain alkyl group, such as methyl, ethyl, propyl or butyl, or a branched-chain alkyl group, such as isopropyl or isobutyl.

[0066] In some specific embodiments, S1 contains two -OC(O)- or -C(O)-O-, that is, S1 contains two -OC(O)-, two -C(O)-O-, or one -OC(O)- and one -C(O)-O-.

[0067] In some specific embodiments, the S1 has a structure shown in formula (7),

[0068]

[0069] In formula (7), R 26 C2-C 10 Alkylene or C2-C 10The halogen atom-substituted alkylene group includes a straight-chain alkylene group, such as methylene, ethylene, propylene or butylene, or a branched alkylene group, such as isopropylene or isobutylene; x is an integer from 0 to 10, specifically 0, 1, 2, 3, 4, 5, 6, 7, 8, 9 or 10.

[0070] In some specific embodiments, the monomer β is selected from at least one of 1,4-butanediol dimethacrylate, 1,6-hexanediol dimethacrylate, ethylene glycol dimethacrylate, diethylene glycol dimethacrylate, triethylene glycol dimethacrylate, tetraethylene glycol dimethacrylate, 1,3-butanediol dimethacrylate, neopentyl glycol dimethacrylate, methacrylic anhydride, dipropylene-2-enyl-2-methylenesuccinate, dipropylene-2-enyl 2-benzylidenemalonate, or diethyl diallylmalonate.

[0071] In the hearing aid of the specific embodiment of the present invention, in some specific embodiments, the hydrophobic layer is a plasma polymerized coating formed by the plasma of monomer α and monomer β. In other specific embodiments, without affecting the overall performance of the hydrophobic layer, the hydrophobic layer can be a plasma polymerized coating formed by the plasma of monomer α, monomer β and other appropriate monomers.

[0072] In the hearing aid of the specific embodiment of the present invention, in order to make the hydrophobic layer have good waterproof performance and lasting protection for the hearing aid, the relative ratio of monomer α to monomer β is adjusted. In some specific embodiments, the molar ratio of monomer α to monomer β is 1:5 to 5:1, and specifically can be 1:5, 1:4, 1:3, 1:2, 1:1, 2:1, 3:1, 4:1 or 5:1, etc. In other specific embodiments, according to the specific monomer conditions and specific product protection requirements, other ratios can also be adjusted.

[0073] In some specific embodiments of the hearing aid of the specific embodiments of the present invention, the waterproof coating includes a protective layer and any of the above-mentioned hydrophobic layers, the protective layer is formed on at least a portion of the surface of the hearing aid, the hydrophobic layer is formed on the protective layer, and the protective layer is located between at least a portion of the surface of the hearing aid and the hydrophobic layer.

[0074] In some specific embodiments, the protective layer is a plasma-polymerized coating formed by contacting at least a portion of the surface of the hearing aid with a plasma containing monomer γ and monomer δ, and the hydrophobic layer is a plasma-polymerized coating formed by contacting the protective layer formed on at least a portion of the surface of the hearing aid with a plasma containing monomer α and monomer β.

[0075] In some specific embodiments of the hearing aid of the present invention, the monomer γ has a structure shown in formula (4),

[0076]

[0077] In formula (4), R 13 is selected from CH or C3-C8 cycloalkyl, R 14 , R 15 and R 16 are independently selected from a connecting bond or a C1-C6 alkylene group, and the R 14 and R 15 When they are all connecting bonds, they are not connected to the same carbon atom, A is the connecting part, and B contains a carbon-carbon unsaturated bond or an epoxy structure.

[0078] In some embodiments, R 13 is selected from a C3-C8 cycloalkyl group, such as a cyclopentyl group or a cyclohexyl group, wherein R 14 and R 15 With R 13 Share two carbon atoms. 13 , R 14 and R 15 They are independently selected from connecting bonds or C1-C6 alkylene groups, wherein the alkylene groups include straight-chain alkylene groups, such as methylene, ethylene, propylene or butylene, or branched alkylene groups, such as isopropylene or isobutylene.

[0079] In some specific embodiments, in formula (4), A is -OC(O)- or -C(O)-O-. In some specific embodiments, in formula (4), B is a carbon-carbon unsaturated double bond or a carbon-carbon unsaturated triple bond or an epoxy structure, and the structure contained in B can cooperate with the epoxy structure in the structure of formula (4) to make the coating formed by polymerization have better density.

[0080] Further, in some specific embodiments, the monomer γ has a structure shown in formula (6),

[0081]

[0082] In formula (6), R 23 , R 24 and R 25 are independently selected from hydrogen atoms, halogen atoms, C1-C 10 Alkyl or C1-C 10 The halogen atom replaces the alkyl group. Using the monomer γ of the structure shown in formula (6), a protective layer with better protective performance can be obtained. In some specific embodiments, R 23 , R 24 and R 25In some embodiments, the C1-C 10 The alkyl group includes a straight chain alkyl group, such as methyl, ethyl, propyl or butyl, or a branched chain alkyl group, such as isopropyl or isobutyl.

[0083] In some specific embodiments, the monomer γ is selected from: one or more of: glycidyl methacrylate, tetrahydrofurfuryl acrylate, 3,4-epoxycyclohexyl methyl-3,4-epoxycyclohexyl carboxylate, 3,4-epoxycyclohexyl methacrylate, 3,4-epoxycyclohexyl methyl methacrylate, 1,2-epoxy-4-vinylcyclohexane, bis(2,3-epoxycyclopentyl) ether, 2,3-epoxycyclopentylcyclopentyl ether, vinylcyclohexene diepoxide, diisoprene diepoxide or bis((3,4-epoxycyclohexyl)methyl)adipate.

[0084] In some specific embodiments of the hearing aid of the specific embodiment of the present invention, the monomer δ has a structure shown in formula (5),

[0085]

[0086] In formula (5), S2 includes one or more -OC(O)- or -C(O)-O-, R 17 , R 18 , R 19 , R 20 , R 21 and R 22 are independently selected from hydrogen atoms, halogen atoms, C1-C 10 Alkyl or C1-C 10 The halogen atom replaces the alkyl group; for C1-C 10 Alkyl or C1-C 10 The alkyl group includes a straight-chain alkyl group, such as methyl, ethyl, propyl or butyl, or a branched-chain alkyl group, such as isopropyl or isobutyl.

[0087] In some specific embodiments, S2 contains two -OC(O)- or -C(O)-O-, that is, S2 contains two -OC(O)-, two -C(O)-O-, or one each of -OC(O)- and -C(O)-O-.

[0088] In some specific embodiments, S2 has the structure shown in formula (8),

[0089]

[0090] In formula (8), R 27 C2-C 10 Alkylene or C2-C10 The halogen atom-substituted alkylene group includes a straight-chain alkylene group, such as methylene, ethylene, propylene or butylene, or a branched alkylene group, such as isopropylene or isobutylene; y is an integer from 0 to 10, specifically 0, 1, 2, 3, 4, 5, 6, 7, 8, 9 or 10.

[0091] In the hearing aid of the specific embodiment of the present invention, in some specific embodiments, the monomer δ is selected from at least one of 1,4-butanediol dimethacrylate, 1,6-hexanediol dimethacrylate, ethylene glycol dimethacrylate, diethylene glycol dimethacrylate, triethylene glycol dimethacrylate, tetraethylene glycol dimethacrylate, 1,3-butanediol dimethacrylate, neopentyl glycol dimethacrylate, methacrylic anhydride, dipropylene-2-enyl-2-methylenesuccinate, dipropylene-2-enyl 2-benzylidenemalonate or diethyl diallylmalonate.

[0092] In some embodiments of the hearing aid of the present invention, R1, R2, R3, R4, R5, R6, R7, R8, R9, R10, R11, R12, R13, R14, R15, R16, R17, R18, R19, R20, R21, R22, R23, R24, R25, R26, R27, R28, R29, R30, R31, 17 , R 18 , R 19 , R 20 , R 21 , R 22 , R 23 , R 24 and R 25 are independently selected from a hydrogen atom or a methyl group.

[0093] In some embodiments of the hearing aid of the specific embodiment of the present invention, the protective layer is a plasma polymerized coating formed by the plasma of monomer γ and monomer δ. In other embodiments, without affecting the overall performance of the protective layer, the protective layer can be a plasma polymerized coating formed by the plasma of monomer γ, monomer δ and other appropriate monomers.

[0094] In the hearing aid of the specific embodiment of the present invention, in order to make the protective layer cooperate with the hydrophobic layer to achieve good waterproof performance and long-lasting protection for the hearing aid, the relative ratio of monomer γ to monomer δ is adjusted. In some specific embodiments, the molar ratio of monomer γ to monomer δ is 1:3 to 3:1, and specifically can be 1:3, 1:2, 1:1, 2:1 or 3:1, etc. In other specific embodiments, according to the specific monomer conditions and specific product protection requirements, other ratios can also be adjusted.

[0095] In some specific embodiments of the hearing aid according to the specific embodiments of the present invention, the thickness of the waterproof coating formed on at least a portion of the surface of the hearing aid is 1 mm to 10 μm.

[0096] In a hearing aid of a specific embodiment of the present invention, at least part of the surface of the hearing aid has a waterproof coating. According to the product design and protection design of the hearing aid, in some specific embodiments, part of the surface of the hearing aid is formed with a waterproof coating; in some specific embodiments, the entire surface of the hearing aid is formed with a waterproof coating.

[0097] In the hearing aid of the specific embodiment of the present invention, the waterproof coating formed on the surface of the hearing aid has good hydrophobic properties, thereby achieving a good waterproof effect. In some specific embodiments, the water contact angle of the waterproof coating is above 100°.

[0098] In the hearing aid of the specific embodiment of the present invention, the waterproof coating formed on the surface of the hearing aid has good hydrophobic properties and high temperature and high humidity resistance. In some specific embodiments, after the waterproof coating is placed in an environment of temperature 85°C and relative humidity 85% RH for 144 hours, the water contact angle of the waterproof coating is above 90°; in some specific embodiments, after the waterproof coating is placed in an environment of temperature 85°C and relative humidity 85% RH for 144 hours, the water contact angle of the waterproof coating is above 100°.

[0099] The hearing aid of the specific embodiment of the present invention has a waterproof coating formed on the surface of the hearing aid with good hydrophobicity and anti-aging performance. The hearing aid is subjected to a xenon lamp aging test according to GB / T 16422.2-2014. Specifically, the hearing aid is placed in a test box at a temperature of 38°C, a relative humidity of 50%RH, a black mark temperature of 65°C, and an irradiance of 0.51W / (m 2 ·nm) and a radiation wavelength of 340nm, a xenon arc lamp was exposed to 60 dry-wet cycles, the drying time for each dry-wet cycle was 102 minutes, and the water spraying time was 18 minutes. After 60 dry-wet cycles, in some specific embodiments, the water contact angle of the waterproof coating on the surface of the hearing aid is above 90°; in some specific embodiments, the water contact angle of the waterproof coating on the surface of the hearing aid is above 100°.

[0100] In the hearing aid of the specific embodiment of the present invention, the waterproof coating formed on the surface of the hearing aid has good hydrophobic performance and lasting waterproof effect. The hearing aid is subjected to accelerated environmental test A, which includes a salt spray test according to IEC60068-2-11, a cyclic damp heat test according to IEC 60068-2-30, and a temperature change test according to IEC 60068-2-14. After each accelerated environmental test A, the hearing aid's hearing function is tested, that is, after the hearing aid passes the test process, whether its hearing function is as normal as before the test. The protective effect of the waterproof coating on the hearing aid is judged by the number of times the hearing aid can pass the accelerated environmental test A while maintaining its normal hearing function. In some specific embodiments, after three times of the accelerated environmental test A, the function of the hearing aid is still normal; in some specific embodiments, after six times of the accelerated environmental test A, the function of the hearing aid is still normal; in some specific embodiments, after ten times of the accelerated environmental test A, the function of the hearing aid is still normal; this proves that the waterproof coating has good waterproof and protective effects on the hearing aid, and the protective performance remains stable in environments such as humidity, heat and salt spray.

[0101] The hearing aid of the specific embodiment of the present invention has a waterproof coating formed on the surface of the hearing aid with good waterproof and anti-corrosion properties. The hearing aid is subjected to an accelerated environmental test B, which includes an immersion test, a sweat spray test, and a sweat atmosphere test.

[0102] In some specific embodiments, the immersion test method includes: taking 200 ml of acidic sweat with pH = 5 or 0.9% saline in a glass container, immersing the hearing aid in the container, ensuring that the hearing aid is completely immersed, and covering the container with a silicone cover and sealing it; placing the glass container in a container at 38°C ± 2°C for 3 days. After the test, the hearing aid functions normally.

[0103] In some specific embodiments, the sweat spray test method includes: placing the hearing aid in a sweat spray chamber for 45 seconds to deposit acidic sweat with pH=1.8 on the surface of the hearing aid; then placing the hearing aid in a 40°C oven for 30 minutes; then placing the hearing aid in a temperature and humidity chamber (relative humidity 100% RH, chamber temperature 65°C) for 1 hour; repeating the above steps 5 times. After the test, the hearing aid functions normally.

[0104] In some specific embodiments, the sweat atmosphere test method includes: specific test method: take 20 ml of artificial sweat with pH = 1.8 and place it in container A, place the hearing aid in container B, and then place container A and container B together in a larger container C, and seal container C; place container C in an oven at a temperature of 38°C ± 2°C; place it for 10 days. After the test, the hearing aid functions normally.

[0105] The hearing aid of the specific embodiment of the present invention is waterproof, sweat-resistant, salt spray-resistant, heat-resistant, heat-shock-resistant and has excellent hydrophobic properties, thereby meeting the use requirements.

[0106] The hearing aid of the specific embodiment of the present invention has good environmental performance and complies with the environmental protection regulations of the European Union and the United States. For example, it complies with the REACH (Registration, Evaluation and Authorization of Chemicals) standard, and meets the requirements of the European Union on the registration, evaluation, authorization and restriction of chemicals; it complies with RoHS (Restriction of Hazardous Substances), that is, it meets the requirements of the European Union's directive on restricting the use of certain hazardous ingredients in electronic and electrical equipment; it meets the requirements of the European Union's halogen-free standards; it complies with the European Union and the United States' standards on PFOA / PFOS (Perfluorooctanoic Acid / Perfluorooctane Sulfonate), such as CA65, and meets the requirements for restrictions on ammonium perfluorooctanoate and perfluorooctane sulfonyl compounds.

[0107] The hearing aid of the specific embodiment of the present invention can be applied as a medical hearing aid, and the waterproof coating on its surface can pass the ISO10993 biological evaluation, including: ISO10993-5 Biological evaluation of medical devices Part 5: In vitro cytotoxicity test, and ISO10993-10 Biological evaluation of medical devices Part 10: Irritation and skin sensitization test.

[0108] A specific embodiment of the present invention also provides a method for preparing any one of the above hearing aids, the method comprising: providing a hearing aid, placing the hearing aid in a plasma reaction chamber, evacuating the chamber to a pressure of 20 to 200 mTorr, and introducing one or more of helium, argon or oxygen; introducing vapor including monomer α into the reaction chamber, starting plasma discharge, and forming a hydrophobic layer on at least a portion of the surface of the hearing aid.

[0109] In some specific embodiments, the vapor including monomer α also includes monomer β, that is, mixed monomer vapor including monomer α and monomer β is introduced into the reaction chamber to form a hydrophobic layer on at least a portion of the surface of the hearing aid.

[0110] In some specific embodiments, the preparation method includes: providing a hearing aid, placing the hearing aid in a plasma reaction chamber, evacuating the chamber to 20-200 mTorr, and introducing one or more of helium, argon or oxygen; introducing a mixed monomer vapor containing monomer γ and monomer δ into the reaction chamber, starting plasma discharge, and forming the protective layer on at least a portion of the surface of the hearing aid; introducing a mixed monomer vapor containing monomer α and monomer β into the reaction chamber, starting plasma discharge, and forming the hydrophobic layer on the protective layer.

[0111] The monomer α and the monomer β, the monomer γ and the monomer δ are the same as those described above and will not be described in detail herein.

[0112] In the method for preparing a hearing aid according to a specific embodiment of the present invention, in order to further enhance the bonding force between the plasma coating and the hearing aid, in some specific embodiments, the hearing aid is pretreated with continuous wave plasma, and the specific conditions are, for example, in an inert gas atmosphere, the plasma continuous discharge power is 50 to 500 W, and specifically, it can be 50 W, 100 W, 150 W, 180 W, 200 W, 250 W, 300 W, 350 W, 400 W, 450 W or 500 W, etc., and the continuous discharge time is 30 to 1800 s, and specifically, it can be 30 s, 50 s, 100 s, 200 s, 300 s, 400 s, 500 s, 600 s, 900 s, 1000 s, 1200 s, 1500 s or 1800 s, etc. In other specific embodiments, the hearing aid is pretreated with heat, oxygen or high energy radiation.

[0113] In the method for preparing a hearing aid according to a specific embodiment of the present invention, in some specific embodiments, the plasma is a pulsed plasma, and the flow rate of the monomer vapor or the mixed monomer vapor is 50 to 500 μL / min, and specifically, for example, it can be 100 μL / min, 150 μL / min, 200 μL / min, 250 μL / min, 300 μL / min or 400 μL / min, etc. In some specific embodiments, the monomer vapor is obtained by gasifying a liquid monomer at room temperature, and the monomer gasification temperature is 50°C to 120°C, and specifically, for example, it can be 50°C, 60°C, 70°C, 75°C, 80°C, 85°C, 90°C, 95°C, 100°C, 110°C or 120°C, etc., and the gasification occurs under vacuum conditions.

[0114] In the method for preparing a hearing aid according to a specific embodiment of the present invention, in order to make plasma discharge more conducive to the monomer being excited into plasma and polymerized to form a waterproof coating, in some specific embodiments, the plasma discharge is carried out by pulse discharge, and the pulse power is 10W to 500W, and specific examples include 10W, 30W, 50W, 75W, 100W, 150W, 200W, 250W, 300W, 350W, 400W, 450W or 500W, etc.; the pulse frequency is 10Hz to 10kHz, and specific examples include 10Hz, 25Hz, 30Hz, 35Hz, 40Hz, 45Hz, 50Hz, 55Hz, 60Hz, 65Hz, 70Hz, 75Hz, 80Hz, 90Hz, 100Hz, 200Hz, 300Hz, 400Hz, 500Hz , 1kHz, 2kHz, 3kHz, 5kHz, 7kHz or 10kHz, etc.; the pulse duty cycle is 1% to 85%, for example, it can be 1%, 5%, 10%, 15%, 20%, 25%, 30%, 35%, 40%, 45%, 50%, 55%, 60%, 65%, 70%, 75%, 80% or 85%, etc.; the plasma discharge time is 100s to 36 000s, for example, it can be 100s, 200s, 500s, 1000s, 1200s, 1500s, 1800s, 2000s, 3000s, 4000s, 5000s, 6000s, 7000s, 8000s, 9000s, 10000s, 15000s, 20000s, 25000s, 30000s or 36000s, etc.

[0115] In the method for preparing a hearing aid according to a specific embodiment of the present invention, in some specific embodiments, the plasma discharge mode can be various existing discharge modes, for example, electrodeless discharge (such as radio frequency inductively coupled discharge, microwave discharge), single electrode discharge (such as corona discharge, plasma jet formed by monopole discharge), double electrode discharge (such as dielectric barrier discharge, bare electrode radio frequency glow discharge) and multi-electrode discharge (such as discharge using a floating electrode as the third electrode).

[0116] The present invention is further described below by means of specific examples.

[0117] Example

[0118] Test Method Description

[0119] (I) Waterproof coating performance and aging test

[0120] (1) Waterproof coating thickness test: Use the American Filmetrics F20-UV-film thickness measuring instrument for testing.

[0121] (2) Water contact angle test of waterproof coating: Tested according to GB / T 30447-2013 standard.

[0122] (3) High temperature and high humidity environmental test: Conducted in accordance with GB / T 2423.3-2006 Environmental testing for electrical and electronic products Part 2: Test method Test Cab: Steady state damp heat test;

[0123] Specific test method: Place the sample in a test chamber at 85°C and 85% RH for 144 hours, and then test the water contact angle on the surface.

[0124] (4) Xenon lamp aging test: according to GB / T 16422.2-2014 Plastics laboratory light source exposure test method Part 2: Xenon arc lamp test method;

[0125] Specific test method: Place the sample at an irradiance of 0.51W / (m 2 ·nm)@340nm, black mark temperature 65℃, test chamber temperature 38℃, relative humidity 50%RH, with drying 102min and spraying 18min as one cycle, test 60 cycles, and then test the water contact angle of the surface.

[0126] (II) Hearing Aid Accelerated Environmental Test A

[0127] (1) Salt spray test: Tested according to IEC 60068-2-11. Test Ka salt spray test standard;

[0128] Specific test method: 5% NaCl concentration, test temperature 35℃, spray volume: 1-2 ml / hour / 80 square centimeters; pH value: 6.5-7.2 (pH value when the temperature is 35℃±2℃), test tolerance: salt spray concentration ±1%, test temperature ±2℃, spray time 2h, let stand for 1h after spraying; after completion, replace the new battery and conduct a hearing test on the hearing aid to confirm whether the function is normal.

[0129] (2) Cyclic damp heat test: Tested according to IEC 60068-2-30 Test D Cyclic damp heat (12+12h cycle) test standard;

[0130] Specific test method: high temperature 55℃, low temperature 25℃, humidity maintained at 93%RH~96%RH, 12h per cycle, 2 cycles in total; after completion, replace new batteries and conduct hearing test on the hearing aid to confirm whether the function is normal.

[0131] (3) Temperature change test: thermal shock test according to IEC 60068-2-14 Test N temperature change standard;

[0132] Specific test method: low temperature -25℃, high temperature 70℃, dwell time 30min, conversion time less than 30s, each cycle test 2h, let stand for 0.5~2h after completion; after completion, replace new batteries and conduct hearing test on the hearing aid, for a total of 5 cycles.

[0133] (4) Accelerated environmental test: The above-mentioned salt spray test, cyclic humidity and heat test, and temperature change test are combined into one large cycle. After each large cycle, test whether the hearing aid functions normally until the hearing aid fails. If the hearing aid still functions normally after 10 large cycles, stop the test and record the number of accelerated environmental tests that the hearing aid can withstand.

[0134] (III) Hearing Aid Accelerated Environmental Test B

[0135] (1) Immersion test

[0136] Specific test method: Take 200 ml of acidic sweat with pH = 5 or 0.9% saline solution in a glass container, immerse the hearing aid in the container, make sure the hearing aid is completely immersed, and cover the container with a silicone lid and seal it; place the glass container in a container at 38℃±2℃ for 3 days; after the test, test whether the hearing aid functions normally, and perform corrosion analysis on the hearing aid under an optical microscope.

[0137] (2) Sweat spray test

[0138] Specific test method: Place the hearing aid in a sweat spray chamber for 45 seconds to allow acidic sweat with a pH of 1.8 to deposit on the surface of the hearing aid; then place the hearing aid in a 40°C oven for 30 minutes; then, place the hearing aid in a temperature and humidity chamber (relative humidity 100% RH, chamber temperature 65°C) for 1 hour; repeat the above steps 5 times; after the test, test whether the hearing aid functions normally, and perform corrosion analysis on the hearing aid under an optical microscope.

[0139] (3) Sweat atmosphere test

[0140] Specific test method: Take 20 ml of artificial sweat with pH = 1.8 and place it in container A, place the hearing aid in container B, and then place container A and container B together in a larger container C, and seal container C; place container C in an oven at 38℃±2℃; place it for 10 days; after the test, test whether the hearing aid functions normally, and perform corrosion analysis on the hearing aid under an optical microscope.

[0141] Example 1

[0142] (1) Place the silicon wafer, PA66 substrate and hearing aid on a rack in a plasma chamber, evacuate the chamber to 100 mTorr, introduce helium into the chamber at a flow rate of 20 sccm, set the chamber temperature to 40°C, and rotate the rack at a frequency of 30 Hz;

[0143] (2) Start plasma continuous discharge for pretreatment, with a continuous discharge power of 180 W and a continuous discharge of 600 s;

[0144] (3) introducing a mixed monomer of 1,4-butylene glycol dimethacrylate and glycidyl methacrylate (mass ratio 2:3) at a flow rate of 250 μL / min, and introducing the mixed monomer into a chamber for plasma chemical vapor deposition after vaporization at a vaporization temperature of 100° C.; using radio frequency discharge to generate plasma in the chamber, the output mode is pulse, the discharge power is 50 W, the frequency is 50 Hz, the pulse duty cycle is 25%, and the discharge time is 1800 s;

[0145] (4) introducing a mixed monomer of dodecamethylcyclohexasiloxane and methacrylic anhydride (mass ratio 1:1) at a flow rate of 150 μL / min, and introducing the mixed monomer into the chamber for plasma chemical vapor deposition after vaporization at a vaporization temperature of 75° C., and discharging in a pulsed manner, wherein the pulse duty cycle is 10%, the pulse frequency is 50 Hz, the pulse discharge power is 100 W, and the reaction time is 1200 s;

[0146] (5) After the coating is completed, the chamber is filled with compressed air to restore the chamber to normal pressure. The coated substrate and hearing aid product are taken out for testing. The test results are listed in Tables 1 to 3.

[0147] Example 2

[0148] (1) Place the silicon wafer, PA66 substrate and hearing aid on a rack in a plasma chamber, evacuate the chamber to 90 mTorr, introduce helium into the chamber at a flow rate of 35 sccm, set the chamber temperature to 50°C, and rotate the rack at a frequency of 30 Hz;

[0149] (2) Start plasma continuous discharge for pretreatment, with a continuous discharge power of 180 W and a continuous discharge of 600 s;

[0150] (3) introducing a mixed monomer of 1,6-hexanediol dimethacrylate and 3,4-epoxycyclohexylmethyl-3,4-epoxycyclohexylcarboxylate (mass ratio 2:3) at a flow rate of 200 μL / min, and introducing the mixed monomer into a chamber for plasma chemical vapor deposition after vaporization at a vaporization temperature of 110° C.; using radio frequency discharge to generate plasma in the chamber, the output mode is pulse, the discharge power is 75 W, the frequency is 50 Hz, the pulse duty cycle is 15%, and the discharge time is 1800 s;

[0151] (4) introducing a mixed monomer of 1,6-hexanediol dimethacrylate and hexaethylcyclotrisiloxane (mass ratio 2:1) at a flow rate of 150 μL / min, and introducing the mixed monomer into the chamber for plasma chemical vapor deposition after vaporization at a vaporization temperature of 75° C., and discharging in a pulsed manner, wherein the pulse duty cycle is 10%, the pulse frequency is 50 Hz, the pulse discharge power is 100 W, and the reaction time is 1200 s;

[0152] (5) After the coating is completed, the chamber is filled with compressed air to restore the chamber to normal pressure. The coated substrate and hearing aid product are taken out for testing. The test results are listed in Tables 1 to 3.

[0153] Example 3

[0154] (1) Place the silicon wafer, PA66 substrate and hearing aid on a rack in a plasma chamber, evacuate the chamber to 110 mTorr, introduce helium into the chamber at a flow rate of 30 sccm, set the chamber temperature to 50°C, and rotate the rack at a frequency of 30 Hz;

[0155] (2) Start plasma continuous discharge for pretreatment, with a continuous discharge power of 180 W and a continuous discharge of 600 s;

[0156] (3) introducing a mixed monomer of 2,3-epoxycyclopentylcyclopentyl ether and triethylene glycol dimethacrylate (mass ratio 4:5) at a flow rate of 200 μL / min, and introducing the mixed monomer into a chamber for plasma chemical vapor deposition after vaporization at a vaporization temperature of 110° C.; using radio frequency discharge to generate plasma in the chamber, the output mode is pulse, the discharge power is 100 W, the frequency is 50 Hz, the pulse duty cycle is 10%, and the discharge time is 1500 s;

[0157] (4) introducing a mixed monomer of 1,4-butylene glycol dimethacrylate and 1,3-dichlorotetramethyldisiloxane (mass ratio 4:3) at a flow rate of 150 μL / min, and introducing the mixed monomer into the chamber for plasma chemical vapor deposition after being vaporized at a vaporization temperature of 75° C., and discharging in a pulsed manner, wherein the pulse duty cycle is 20%, the pulse frequency is 50 Hz, the pulse discharge power is 50 W, and the reaction time is 1500 s;

[0158] (5) After the coating is completed, the chamber is filled with compressed air to restore the chamber to normal pressure. The coated substrate and hearing aid product are taken out for testing. The test results are listed in Tables 1 to 3.

[0159] Example 4

[0160] (1) Place the silicon wafer, PA66 substrate and hearing aid on a rack in a plasma chamber, evacuate the chamber to 100 mTorr, introduce helium into the chamber at a flow rate of 20 sccm, set the chamber temperature to 45°C, and rotate the rack at a frequency of 30 Hz;

[0161] (2) Start plasma continuous discharge for pretreatment, with a continuous discharge power of 180 W and a continuous discharge of 600 s;

[0162] (3) introducing a mixed monomer of ethylene glycol dimethacrylate and bis(2,3-epoxycyclopentyl) ether (mass ratio 2:1) at a flow rate of 200 μL / min, and introducing the mixed monomer into a chamber for plasma chemical vapor deposition after vaporization at a vaporization temperature of 100° C.; using radio frequency discharge to generate plasma in the chamber, the output mode is pulse, the discharge power is 100 W, the frequency is 50 Hz, the pulse duty cycle is 10%, and the discharge time is 1800 s;

[0163] (4) introducing a mixed monomer of 1,6-hexanediol dimethacrylate and hexaethylcyclotrisiloxane (mass ratio 2:1) at a flow rate of 150 μL / min, and introducing the mixed monomer into the chamber for plasma chemical vapor deposition after being vaporized at a vaporization temperature of 80° C., and discharging in a pulsed manner, wherein the pulse duty cycle is 10%, the pulse frequency is 50 Hz, the pulse discharge power is 50 W, and the reaction time is 1200 s;

[0164] (5) After the coating is completed, the chamber is filled with compressed air to restore the chamber to normal pressure. The coated substrate and hearing aid product are taken out for testing. The test results are listed in Tables 1 to 3.

[0165] Example 5

[0166] (1) Place the silicon wafer, PA66 substrate and hearing aid on a rack in a plasma chamber, evacuate the chamber to 100 mTorr, introduce helium into the chamber at a flow rate of 35 sccm, set the chamber temperature to 50°C, and rotate the rack at a frequency of 30 Hz;

[0167] (2) Start plasma continuous discharge for pretreatment, with a continuous discharge power of 180 W and a continuous discharge of 600 s;

[0168] (3) introducing a mixed monomer of 1,6-hexanediol dimethacrylate and hexaethylcyclotrisiloxane (mass ratio 2:1) at a flow rate of 200 μL / min, and introducing the mixed monomer into the chamber for plasma chemical vapor deposition after being vaporized at a vaporization temperature of 75° C., and discharging in a pulsed manner, wherein the pulse duty cycle is 10%, the pulse frequency is 50 Hz, the pulse discharge power is 100 W, and the reaction time is 3000 s;

[0169] (4) After the coating is completed, the chamber is filled with compressed air to restore the chamber to normal pressure. The coated substrate and hearing aid product are taken out for testing. The test results are listed in Tables 1 to 3.

[0170] Example 6

[0171] (1) Place the silicon wafer, PA66 substrate and hearing aid on a rack in a plasma chamber, evacuate the chamber to 100 mTorr, introduce helium into the chamber at a flow rate of 35 sccm, set the chamber temperature to 50°C, and rotate the rack at a frequency of 30 Hz;

[0172] (2) Start plasma continuous discharge for pretreatment, with a continuous discharge power of 180 W and a continuous discharge of 600 s;

[0173] (3) introducing a mixed monomer of 1,3-dichlorotetramethyldisiloxane and methacrylic anhydride (mass ratio 3:1) at a flow rate of 250 μL / min, performing plasma chemical vapor deposition in a chamber after vaporization at a vaporization temperature of 75° C., and discharging in a pulsed manner, wherein the pulse duty cycle is 10%, the pulse frequency is 50 Hz, the pulse discharge power is 50 W, and the reaction time is 2800 s;

[0174] (4) After the coating is completed, the chamber is filled with compressed air to restore the chamber to normal pressure. The coated substrate and hearing aid product are taken out for testing. The test results are listed in Tables 1 to 3.

[0175] Example 7

[0176] (1) Place the silicon wafer, PA66 substrate and hearing aid on a rack in a plasma chamber, evacuate the chamber to 100 mTorr, introduce helium into the chamber at a flow rate of 25 sccm, set the chamber temperature to 45°C, and rotate the rack at a frequency of 30 Hz;

[0177] (2) Start plasma continuous discharge for pretreatment, with a continuous discharge power of 180 W and a continuous discharge of 600 s;

[0178] (3) introducing monomer 1,3-diphenyl-1,3-bis(trimethylsilyloxy)disiloxane at a monomer flow rate of 250 μL / min, performing plasma chemical vapor deposition in the chamber after vaporization at a vaporization temperature of 85° C., and discharging in a pulsed manner, wherein the pulse duty cycle is 10%, the pulse frequency is 50 Hz, the pulse discharge power is 55 W, and the reaction time is 3200 s;

[0179] (4) After the coating is completed, the chamber is filled with compressed air to restore the chamber to normal pressure. The coated substrate and hearing aid product are taken out for testing. The test results are listed in Tables 1 to 3.

[0180] Example 8

[0181] (1) Place the silicon wafer, PA66 substrate and hearing aid on a rack in a plasma chamber, evacuate the chamber to 110 mTorr, introduce helium into the chamber at a flow rate of 30 sccm, set the chamber temperature to 48°C, and rotate the rack at a frequency of 30 Hz;

[0182] (2) starting plasma continuous discharge for pretreatment, with a continuous discharge power of 120 W and a continuous discharge of 800 s;

[0183] (3) introducing monomer 2,4,6-triethyl-2,4,6-trimethylcyclotrisiloxane at a monomer flow rate of 300 μL / min, performing plasma chemical vapor deposition in the chamber after vaporization at a vaporization temperature of 95° C., and discharging in a pulsed manner, wherein the pulse duty cycle is 15%, the pulse frequency is 50 Hz, the pulse discharge power is 45 W, and the reaction time is 3000 s;

[0184] (4) After the coating is completed, the chamber is filled with compressed air to restore the chamber to normal pressure. The coated substrate and hearing aid product are taken out for testing. The test results are listed in Tables 1 to 3.

[0185] Table 1 Waterproof coating performance and aging test results

[0186]

[0187] Table 2 Test results of hearing aid accelerated environmental test A

[0188]

[0189] Table 3 Test results of hearing aid accelerated environmental test B

[0190]

[0191] It can be seen from Table 1 that the waterproof coatings prepared on the silicon wafer, PA66 substrate and hearing aid in Examples 1 to 4 have a water contact angle of the waterproof coating on the silicon wafer surface of above 107°, and after the high temperature and high humidity environment test and the xenon lamp aging test, the water contact angle is above 103°, and it still has good hydrophobic properties; the water contact angle of the waterproof coating on the PA66 substrate surface is above 111°, and after the high temperature and high humidity environment test and the xenon lamp aging test, the water contact angle is above 107°, and it still has good hydrophobic properties.

[0192] The waterproof coatings prepared in Example 5 and Example 6 on silicon wafers, PA66 substrates and hearing aids have a water contact angle of the waterproof coating on the silicon wafer surface of above 105°, showing good hydrophobic properties. After high temperature and high humidity environment test, the water contact angle of the waterproof coating is above 97°, and after xenon lamp aging test, the water contact angle of the waterproof coating is above 99°; the water contact angle of the waterproof coating on the PA66 substrate surface is above 110°, after high temperature and high humidity environment test, the water contact angle of the waterproof coating is above 103°, and after xenon lamp aging test, the water contact angle of the waterproof coating is above 101°.

[0193] The waterproof coatings prepared in Example 7 and Example 8 on silicon wafers, PA66 substrates and hearing aids have a water contact angle of the waterproof coating on the silicon wafer surface of above 102°, showing good hydrophobic properties. After the high temperature and high humidity environment test, the water contact angle of the waterproof coating is above 95°, and after the xenon lamp aging test, the water contact angle of the waterproof coating is above 93°; the water contact angle of the waterproof coating on the PA66 substrate surface is above 113°, after the high temperature and high humidity environment test, the water contact angle of the waterproof coating is above 102°, and after the xenon lamp aging test, the water contact angle of the waterproof coating is above 101°.

[0194] Compared with Examples 5 to 8, the waterproof coatings in Examples 1 to 4 have better resistance to high temperature and humidity and xenon lamp aging. The water contact angle decreases less in environments such as high temperature and humidity and xenon lamp irradiation, and the hydrophobic performance is more stable.

[0195] It can be seen from Table 2 that after the hearing aid is subjected to accelerated environmental test A, that is, after a cycle of salt spray test, cyclic humidity and heat test and temperature change test, the hearing aid function is tested to see whether it is normal. The hearing aid products of Examples 7 and 8 can withstand accelerated environmental test A for more than 3 times, the hearing aid products of Examples 5 and 6 can withstand accelerated environmental test A for more than 6 times, and the hearing aid products of Examples 1 to 4 can withstand accelerated environmental test A for more than 10 times, indicating that the waterproof coating of the hearing aids in the embodiments of the present invention has a protective effect on the hearing aids, so that the hearing aids have good hydrophobicity, waterproof and sweat resistance, salt spray resistance, humidity and heat resistance, thermal shock resistance and other excellent properties.

[0196] Compared with Example 7-Example 8, the hearing aid products of Example 5-Example 6 have better performances such as waterproof and sweat resistance, salt spray resistance, humidity and heat resistance, and thermal shock resistance. Compared with Example 5-Example 6, the hearing aid products of Example 1-Example 4 have better performances such as waterproof and sweat resistance, salt spray resistance, humidity and heat resistance, and thermal shock resistance.

[0197] It can be seen from Table 3 that after the hearing aids have undergone accelerated environmental test B, i.e., immersion test, sweat spray test and sweat atmosphere test, the hearing aids of Examples 1 to 8 function normally, and the surface waterproof coating has a good protective effect on the hearing aids, thereby making the hearing aids have good hydrophobicity, waterproof and sweat-resistant, and anti-corrosion properties.

[0198] As shown in Table 3, after the sweat atmosphere test, the hearing aids of Examples 1 to 8 showed no corrosion. After the immersion test and the sweat spray test, the hearing aids of Examples 1 to 6 showed no corrosion. Compared with the waterproof coating of the hearing aids of Examples 7 and 8, the waterproof coating of the hearing aids of Examples 1 to 6 has better anti-corrosion performance.

[0199] The above is only an exemplary embodiment used to illustrate the principle of the present invention, and is not intended to limit the scope of protection of the present invention. For those of ordinary skill in the art, various modifications and improvements can be made without departing from the spirit and essence of the present invention, and these modifications and improvements are also within the scope of protection of the present invention.

Claims

1. A hearing aid, characterized in that: A waterproof coating is formed on at least part of the surface of the hearing aid, wherein the waterproof coating includes a hydrophobic layer, and the hydrophobic layer is a plasma polymerized coating formed by plasma including a monomer α; The monomer α is a siloxane monomer, and the siloxane monomer includes one or more linear siloxane monomers or cyclic siloxane monomers.

2. The hearing aid according to claim 1, characterized in that The monomer α comprises at least one of the structures represented by the following formula (1) or (2), In formula (1) or (2), R7, R8, R9, R 11 and R 12 are independently selected from hydrogen atoms, C1-C 12 Substituted or unsubstituted hydrocarbon groups, C1-C 12 Substituted or unsubstituted alkoxy, C1-C 12 substituted or unsubstituted hydrocarbon silyloxy, methacryloyloxy, substituted or unsubstituted amino, substituted or unsubstituted amine, nitrile, aryl, or halogen atom, at least one of R7, R8 and R9 is not a hydrogen atom, and R 11 or R 12 At least one of them is not a hydrogen atom, R 10 C1-C 12 Substituted or unsubstituted hydrocarbon group, or C1-C 12 A substituted or unsubstituted hydrocarbon silicon group, n is an integer of 1-100, and m is an integer of 3-10.

3. The hearing aid according to claim 2, characterized in that R7, R8, R9, R 11 and R 12 are independently selected from methyl, ethyl or halogen atoms, and the R 10 is methyl, ethyl or halogen-substituted dimethylsilyl, and n is an integer of 1-10.

4. The hearing aid according to claim 1, characterized in that The monomer α is selected from the group consisting of diphenyldimethoxysilane, methyl orthosilicate, ethyl orthosilicate, diethylaminomethyltriethoxysilane, diethylenetriaminopropyltrimethoxysilane, 1,1,1-trimethyl-N-2-propylenepropylaminosilane, bis[3-(trimethoxysilyl)propyl]ethylenediamine, pentamethyldisiloxane, hexamethyldisiloxane, hexamethoxydisiloxane, hexaphenyldisiloxane, vinylpentamethyldisiloxane, 1-vinyl-1,1,3,3-tetramethyldisiloxane, 1,3-octyltetramethyldisiloxane, 1,1,3,3-tetramethyl-1,3-diphenyldisiloxane, 1,1,3,3-tetramethyldisiloxane, 1,3-divinyltetramethyldisiloxane 1,3-bis(chloromethyl)tetramethyldisiloxane, 1,3-dichlorotetramethyldisiloxane, 1,3-bis(4-hydroxybutyl)tetramethyldisiloxane, 1,3-bis(3-cyanopropyl)tetramethyldisiloxane, 1,3-dimethyltetravinyldisiloxane, 1,3-dimethoxy-1,1,3,3-tetramethyldisiloxane, 1,1,1,3,3,5,5-heptamethyltrisiloxane, 1,1,1,3,5,5,5-heptamethyltrisiloxane, 1,1,5,5-tetramethyl-3,3-diphenyltrisiloxane, 1,1,3,3,5,5-hexamethyltrisiloxane, octamethyltrisiloxane, decamethyltetrasiloxane, dodecamethylpentasiloxane, decamethyldihydro Pentasiloxane, Tetradecamethyl Hexasiloxane, Hexadecyl Heptasiloxane, Polydimethylsiloxane, Polymethyl Hydrogensiloxane, Polydimethylsiloxane Hydride Terminated, Polyphenylmethylsiloxane, Vinyl Terminated Dimethyl Polysiloxane, Phenyl Tris(Trimethylsiloxy)Silane, Vinyl Tris(Trimethylsiloxy)Silane, Methyl Tris(Trimethylsiloxy)Silane, Ethyl Tris(Trimethylsiloxy)Silane, 1,3-Diphenyl-1,3-Bis(Trimethylsiloxy)Disiloxane, Allyl Tris(Trimethylsiloxy)Silane, Tetra(Trimethylsiloxy)Silane, (3-Chloropropyl) Tris(Trimethylsiloxy)Silane, Methacryloxypropyl Tris(Trimethylsiloxy)Silane, Hexamethylcyclotrisilane The invention can be selected from the group consisting of cyclohexane, hexaethylcyclotrisiloxane, hexaphenylcyclotrisiloxane, 2,4,6-triethyl-2,4,6-trimethylcyclotrisiloxane, 2,4,6-trimethylcyclotrisiloxane, trimethyl-1,3,5-triphenylcyclotrisiloxane, octamethylcyclotetrasiloxane, octaphenylcyclotetrasiloxane, decamethylcyclopentasiloxane, 1,3,5,7-tetramethylcyclotetrasiloxane, 2,4,6,8-tetramethylcyclotetrasiloxane, decamethylcyclopentasiloxane, pentamethylpentavinylcyclopentasiloxane, 2,4,6,8,10-pentamethylcyclopentasiloxane, dodecamethylcyclohexasiloxane, hexamethylhexavinylcyclohexasiloxane, hexadecylcyclooctylsiloxane, and octadecylcyclononasiloxane.

5. The hearing aid according to claim 1, characterized in that The monomer α is selected from one or more of dodecamethylcyclohexasiloxane, hexaethylcyclotrisiloxane, 1,3-dichlorotetramethyldisiloxane, 1,3-diphenyl-1,3-bis(trimethylsiloxy)disiloxane and 2,4,6-triethyl-2,4,6-trimethylcyclotrisiloxane.

6. The hearing aid according to claim 1, characterized in that The hydrophobic layer is a plasma polymerized coating formed by plasma containing the monomer α and the monomer β; The monomer β has a structure shown in formula (3), In formula (3), S1 contains one or more -OC(O)- or -C(O)-O-, and R1, R2, R3, R4, R5 and R6 are independently selected from hydrogen atoms, halogen atoms, C1-C 10 Alkyl or C1-C 10 The alkyl group is substituted with a halogen atom.

7. The hearing aid according to claim 1, characterized in that The monomer β is selected from at least one of 1,4-butanediol dimethacrylate, 1,6-hexanediol dimethacrylate, ethylene glycol dimethacrylate, diethylene glycol dimethacrylate, triethylene glycol dimethacrylate, tetraethylene glycol dimethacrylate, 1,3-butanediol dimethacrylate, neopentyl glycol dimethacrylate, methacrylic anhydride, dipropylene-2-enyl-2-methylenesuccinate, dipropylene-2-enyl 2-benzylidenemalonate, or diethyl diallylmalonate.

8. The hearing aid according to claim 6, characterized in that The molar ratio of the monomer α to the monomer β is 1:5 to 5:

1.

9. The hearing aid according to claim 6, characterized in that The waterproof coating further comprises: a protective layer formed on at least a portion of the surface of the hearing aid, the protective layer being located between at least a portion of the surface of the hearing aid and the hydrophobic layer, the protective layer being a plasma polymerized coating formed by at least a portion of the surface of the hearing aid contacting a plasma containing monomer γ and monomer δ, and the hydrophobic layer being a plasma polymerized coating formed by the protective layer contacting a plasma containing monomer α and monomer β; The monomer γ has a structure shown in formula (4), In formula (4), R 13 is selected from CH or C3-C8 cycloalkyl, R 14 , R 15 and R 16 are independently selected from a connecting bond or a C1-C6 alkylene group, and the R 14 and R 15 When they are all connecting bonds, they are not connected to the same carbon atom, A is the connecting part, and B contains a carbon-carbon unsaturated bond or an epoxy structure; The monomer δ has a structure shown in formula (5), In formula (5), S2 includes one or more -OC(O)- or -C(O)-O-, R 17 , R 18 , R 19 , R 20 , R 21 and R 22 are independently selected from hydrogen atoms, halogen atoms, C1-C 10 Alkyl or C1-C 10 The alkyl group is substituted with a halogen atom.

10. The hearing aid according to claim 9, characterized in that The molar ratio of the monomer γ to the monomer δ is 1:3 to 3:

1.

11. The hearing aid according to claim 9, characterized in that The A is -OC(O)- or -C(O)-O-.

12. The hearing aid according to claim 11, characterized in that The monomer γ has a structure shown in formula (6), In formula (6), R 23 , R 24 and R 25 are independently selected from hydrogen atoms, halogen atoms, C1-C 10 Alkyl or C1-C 10 The alkyl group is substituted with a halogen atom.

13. The hearing aid according to claim 12, characterized in that R1, R2, R3, R4, R5, R6, R 17 , R 18 , R 19 , R 20 , R 21 , R 22 , R 23 , R 24 and R 25 are independently selected from a hydrogen atom or a methyl group.

14. The hearing aid according to claim 9, characterized in that The monomer γ is selected from the group consisting of: glycidyl methacrylate, tetrahydrofurfuryl acrylate, 3,4-epoxycyclohexyl methyl-3,4-epoxycyclohexyl carboxylate, 3,4-epoxycyclohexyl methacrylate, 3,4-epoxycyclohexyl methyl methacrylate, 1,2-epoxy-4-vinylcyclohexane, bis(2,3-epoxycyclopentyl) ether, 2,3-epoxycyclopentylcyclopentyl ether, vinylcyclohexene diepoxide, diisoprene diepoxide or bis((3,4-epoxycyclohexyl)methyl)adipate.

15. The hearing aid according to claim 9, characterized in that The S1 and / or S2 contain two -OC(O)- or -C(O)-O-.

16. The hearing aid according to claim 15, characterized in that The S1 has a structure shown in formula (7), In formula (7), R 26 C2-C 10 Alkylene or C2-C 10 The alkylene group is substituted with a halogen atom, and x is an integer from 0 to 10.

17. The hearing aid according to claim 15, characterized in that The S2 has a structure shown in formula (8), In formula (8), R 27 C2-C 10 Alkylene or C2-C 10 The halogen atom-substituted alkylene group is substituted with y, and y is an integer from 0 to 10.

18. The hearing aid according to claim 9, characterized in that The monomer δ is selected from at least one of 1,4-butylene glycol dimethacrylate, 1,6-hexanediol dimethacrylate, ethylene glycol dimethacrylate, diethylene glycol dimethacrylate, triethylene glycol dimethacrylate, tetraethylene glycol dimethacrylate, 1,3-butylene glycol dimethacrylate, neopentyl glycol dimethacrylate, methacrylic anhydride, dipropylene-2-enyl-2-methylenesuccinate, dipropylene-2-enyl 2-benzylidenemalonate or diethyl diallylmalonate.

19. The hearing aid according to any one of claims 1 to 18, characterized in that: The thickness of the waterproof coating is 1 mm to 10 μm.

20. The hearing aid according to any one of claims 1 to 18, characterized in that: The water contact angle of the waterproof coating is above 100°.

21. The hearing aid according to any one of claims 1 to 18, characterized in that: After the hearing aid is placed in an environment with a temperature of 85° C. and a relative humidity of 85% RH for 144 hours, the water contact angle of the waterproof coating is above 90°.

22. The hearing aid according to any one of claims 1 to 18, characterized in that: The hearing aid was placed in a test chamber with a temperature of 38°C, a relative humidity of 50% RH, a black mark temperature of 65°C, and an irradiance of 0.51 W / (m 2 ·nm), and a radiation wavelength of 340nm were used for 60 dry-wet cycles of exposure to a xenon arc lamp, with a drying time of 102 minutes and a water spraying time of 18 minutes for each dry-wet cycle. After 60 dry-wet cycles, the water contact angle of the waterproof coating was above 90°.

23. The hearing aid according to any one of claims 1 to 18, characterized in that: The hearing aid is subjected to accelerated environmental test A, wherein the accelerated environmental test A includes a salt spray test according to IEC 60068-2-11, a cyclic damp heat test according to IEC 60068-2-30, and a temperature change test according to IEC 60068-2-14. After undergoing the accelerated environmental test A three times, the hearing aid has a hearing aid function.

24. The hearing aid according to claim 23, characterized in that After undergoing the accelerated environmental test A for 6 times, the hearing aid has a hearing aid function.

25. The hearing aid according to any one of claims 1 to 18, characterized in that: The hearing aid is subjected to accelerated environmental test B, which includes: immersion test, sweat spray test and sweat atmosphere test. After the immersion test, the hearing aid has a hearing aid function, after the sweat spray test, the hearing aid has a hearing aid function, and after the sweat atmosphere test, the hearing aid has a hearing aid function.

26. A method for preparing a hearing aid according to any one of claims 1 to 25, characterized in that: include: Providing a hearing aid, placing the hearing aid in a plasma reaction chamber, evacuating the chamber to 20-200 mTorr, and introducing one or more of helium, argon or oxygen; The vapor including the monomer α is introduced into the reaction chamber, and plasma discharge is started to form a hydrophobic layer on at least a portion of the surface of the hearing aid.

27. The preparation method according to claim 26, characterized in that: Introducing the steam including the monomer α into the reaction chamber includes: introducing mixed monomer steam including the monomer α and the monomer β into the reaction chamber.

28. The preparation method according to claim 27, characterized in that: include: Introducing mixed monomer vapor containing monomer γ and monomer δ into a reaction chamber, starting plasma discharge, and forming a protective layer on at least a portion of the surface of the hearing aid; A mixed monomer vapor containing the monomer α and the monomer β is introduced into a reaction chamber, and plasma discharge is started to form the hydrophobic layer on the protective layer.

29. The preparation method according to claim 28, characterized in that: The plasma discharge is performed by pulse discharge, the pulse power is 10W-500W, the pulse frequency is 10Hz-10kHz, the pulse duty ratio is 1%-85%, and the plasma discharge time is 100s-36000s.

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