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JPH07162984

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DESCRIPTION JPH07162984
[0001]
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to the
improvement of microphones, and more particularly to antimicrobial microphones.
[0002]
2. Description of the Related Art There are two types of microphones: electret type and dynamic
type. Both are elements that convert sound into electrical signals, physical filter materials that
transmit only sound to the elements, and vibrations of the microphone housing are not
transmitted to elements. It consists of a shock absorbing material.
[0003]
FIG. 1 shows an explanatory cross-sectional view of the microphone.
1 is a microphone housing, 2 is a conversion element unit combining an electret element and an
impedance conversion circuit, 3 is a polyester or metal net, 4 is a non-woven fabric, 5 is a nonwoven fabric attached to the surface of the element unit 2, 6 is a housing 1 and It is a shock
absorbing material that absorbs the vibration between the element units 2.
[0004]
01-05-2019
1
In recent years, the usage of microphones has been expanded, and in karaoke and the like, the
usage environment is not always used only in a clean environment. In particular, the microphone
for vocals is adjusted to be used close to the mouth. However, in order to use it close to the
mouth, cleanliness is always required.
[0005]
SUMMARY OF THE INVENTION In order to solve the above-mentioned problems, the present
invention imparts antibacterial properties to a microphone body, a net, a nonwoven fabric, a
foam material of a sound collecting part, and a buffer material.
[0006]
In addition, the antibacterial material is kneaded with the resin material at the time of molding
the resin material of the above-mentioned member.
Alternatively, a paint containing an antibacterial material is applied to the surface of the material
after the material is molded.
[0007]
Moreover, an inorganic type antibacterial material is used as said antibacterial material. In
particular, silver acetate is dissolved in water, and either one of Na2SO3.5H2O and
Na2S2O3.5H2O or a combination of K2SO3 and K2S2O3 is sequentially added to the solution to
form a silver thiosulfato complex solution, and then the above-mentioned silica gel powder.
Added, and the solution of silver thiosulfato complex salt is adsorbed on silica gel powder,
impregnated, dried, and the antibacterial agent containing at least an inorganic antibacterial
material consisting of an antibacterial complex consisting of silica gel powder impregnated and
coated with thiosulfato silver complex salt. Material is used.
[0008]
According to the above construction, the present invention can suppress the growth of
microorganisms on the microphone by the antibacterial material.
01-05-2019
2
[0009]
EXAMPLES As the antibacterial material used in the present invention, at least one selected from
the group consisting of metal complex salts, plant extracts, quaternary ammonium salts and
chlorhexidine derivatives is used.
[0010]
In particular, it is preferable to use the above metal complex salt in combination with one or
more selected from the group consisting of plant extracts, quaternary ammonium salts and
chlorhexidine derivatives.
When two or more of the above groups are selected and used as an antibacterial material, an
antibacterial composition having a broad antibacterial spectrum can be obtained.
[0011]
Examples of the above-mentioned plant extract include licorice extract, allyl isothiocyanate,
cinnamic oil and the like, and examples of quaternary ammonium salts include quaternary
ammonium salts of silicone compounds and quaternary ones of aliphatic compounds. Ammonium
salts, benzalkonium chloride and the like can be mentioned, and as the chlorhexidine derivative,
for example, chlorhexidyl gluconate and the like can be mentioned.
[0012]
Silver, copper or zinc is preferable as the metal of the metal complex salt, and silver is more
preferable.
The metal complex salt is preferably a thiosulfato metal complex salt. Therefore, it is more
preferable to use at least one complex salt selected from the group consisting of thiosulfato silver
complex salt, thiosulfato copper complex salt, and thiosulfato zinc complex salt, and it is
preferable to use thiosulfato silver salt. It is most preferred to use complex salts.
01-05-2019
3
[0013]
Conventionally, metal salts have been used as antibacterial materials, but in the case of silver
salts, in particular, they are highly sensitive to light and ultraviolet light, and they discolor when
an antibacterial composition containing these is contained in a synthetic resin.
On the other hand, in the present invention, even when the antibacterial material contains metal,
particularly silver, it is stable against light or ultraviolet light because it is a complex salt.
Antimicrobial materials other than the above are also stable to light or ultraviolet light. Thus, the
antimicrobial and antifungal compositions of the present invention are stable to light or
ultraviolet light. When the antibacterial material is a metal complex, the metal complex does not
have volatility, so the resulting antibacterial composition does not cause environmental pollution.
[0014]
The metal complex salt forms an ozone layer in the vicinity of the pole by oxygen in the air. Since
the microorganisms etc. which approached this ozone layer are influenced by the surface
structure | tissue, the said metal complex salt exhibits an antimicrobial and antifungal effect.
[0015]
When the metal complex salt is a thiosulfato metal complex salt, it can be prepared using a metal
salt and a thiosulfate. For example, sulfite and / or bisulfite are added to an aqueous solution of
metal salt and reacted, and then a thiosulfate is added to form a thiosulfato metal complex salt,
and a metal salt is added to an aqueous thiosulfate solution to produce a thiosulfato metal
complex salt There is a way to generate In the former method, sulfites and / or bisulfites are used
to stabilize the resulting thiosulfato metal complex. In the latter method, the thiosulfato metal
complex can be formed without particularly adding such a stabilizer.
[0016]
For example, when preparing a thiosulfato silver complex salt, it is preferable to use 100 to 1000
parts by weight of thiosulfate per 100 parts by weight of silver salt, and use of sulfite and / or
hydrogen sulfite It is preferable to use 400 to 2000 parts by weight for each 100 parts by weight
01-05-2019
4
of silver salt.
[0017]
When the metal salt is a silver salt, it is preferable that the weight ratio of S2O32- / Ag + be 2 to
6 as the use ratio of the thiosulfate and the silver salt.
When the weight ratio of S2O32- / Ag + is less than 2, a brown or black reaction product such as
silver sulfide is likely to be produced. On the contrary, when the weight ratio of S2O32- / Ag +
exceeds 6, a large amount of unreacted thiosulfate exists, and when a silver thiosulfato complex
salt containing such unreacted thiosulfate is supported on the carrier, The loading of the
thiosulfate may hinder the loading of the thiosulfato silver complex salt. Therefore, by setting the
weight ratio of S2O32- / Ag + in the above range, it is possible to efficiently obtain the thiosulfato
silver complex salt and to prevent the discoloration of the thiosulfato silver complex salt.
[0018]
Since a thiosulfato metal complex salt is easily converted to a sulfide or the like by heating, it is
preferable to carry out the process from preparation of the thiosulfato metal complex salt to
support on a porous particle carrier at a temperature of normal temperature or more and 60 °
C. or less. This can further prevent discoloration of the thiosulfato metal complex salt.
[0019]
As the metal salt used for the preparation of the above-mentioned thiosulfato metal complex, for
example, silver acetate, silver nitrate and the like can be used, but the photoreaction stability of
the metal complex at the time of forming the metal complex is improved. In consideration of the
environmental safety at the time of disposal, the metal salt is preferably silver acetate.
[0020]
Examples of the thiosulfate used in the preparation of the above-mentioned thiosulfato metal
complex salt include sodium thiosulfate, ammonium thiosulfate and the like, and examples of the
sulfite include sodium sulfite, potassium sulfite, ammonium sulfite, potassium metasulfite and the
like Examples of the hydrogen sulfite include sodium hydrogen sulfite, potassium hydrogen
sulfite, ammonium hydrogen sulfite and the like.
01-05-2019
5
[0021]
As the carrier of porous particles used in the present invention, silica gel, zeolite and the like can
be mentioned, but silica gel having larger specific surface area and transparency than zeolite is
preferable.
By using silica gel as the carrier, the antibacterial composition is preferable because it has the
effect of releasing the supported antibacterial material slowly.
The silica gel preferably has an average particle size of 1 to 10 μm.
[0022]
More preferably, it is B-type silica gel defined in Japanese Industrial Standard JIS Z 0701. Among
the B-type silica gels, it is a silica gel having a hygroscopic property of 20% or less at a relative
humidity of 50% (25 ° C.) or less and 50% or more at a relative humidity of 90% (25 ° C.) or
more Is particularly preferred. The silica gel is a silica gel having a relatively small amount of
moisture absorbed in a low humidity region, and a particularly large amount of total supported
amount in a high humidity region. The antimicrobial composition in which the antimicrobial
material is quickly supported by such silica gel suppresses the emission of the antimicrobial
material and has thermal stability, so that the antimicrobial performance can be sustained.
[0023]
Furthermore, the above-mentioned silica gel has light transmittance having a refractive index
similar to that of a synthetic resin. When an antibacterial composition containing such silica gel
is contained in a synthetic resin, it does not color the synthetic resin and does not affect the
characteristics of the synthetic resin, and imparts antibacterial and antifungal properties to the
surface of the synthetic resin. can do.
[0024]
01-05-2019
6
In the present invention, it is also possible to use silica gel fine powder produced by a gas phase
method other than the above-mentioned silica gel.
[0025]
In order to obtain the first antimicrobial composition of the present invention, the aqueous
solution or alcohol solution of the above-mentioned antimicrobial material is mixed with the
above-mentioned carrier and rapidly dried.
By this, the said antibacterial material is carry | supported by the said carrier. In this step, 2 to
10 parts by weight of the antibacterial material is preferably used with respect to 100 parts by
weight of the carrier. The carrier after drying is pulverized if necessary.
[0026]
In the second antibacterial composition of the present invention, at least a part of the surface of
the carrier on which the above-mentioned antibacterial material is supported is coated with a
coating material.
[0027]
The coating material used in the present invention is preferably at least one selected from the
group consisting of organosilicon compounds, waxes and stearic acid compounds, and more
preferably reactive organosilicon compounds.
The reactive organosilicon compound is preferably a compound having a functional group
capable of forming a siloxane bond, such as tetramethoxysilane or tetraethoxysilane.
[0028]
When the above carrier is silica gel, the use of the above-mentioned reactive organosilicon
compound as the coating material will result in hydrolysis of the reactive organosilicon
compound and condensation with the silica gel to form a siloxane bond. Can be coated. In this
01-05-2019
7
step, the coating material is preferably used in an amount of 100 to 200 parts by weight with
respect to 100 parts by weight of the carrier on which the antimicrobial material is supported.
[0029]
The antimicrobial composition of the present invention is further improved in thermal stability
by covering at least a part thereof with a coating material. Therefore, when the resin surface is
dispersed in a resin to impart antibacterial properties, the stability against heat during resin
molding can be increased, and the aged color change of the resin can be suppressed.
Furthermore, since the sustained release of the antimicrobial material supported by the carrier is
increased, the antimicrobial effect is sustained for a long time.
[0030]
Example 1 100 parts by weight of a water-soluble silver salt such as silver acetate, 450 parts by
weight of a mixture of sodium sulfite and sodium bisulfite, and 300 parts by weight of a watersoluble sodium thiosulfate salt are dissolved in water containing no chlorine The mixture was
mixed with sufficient stirring to obtain an aqueous solution of silver complex salt. The weight of
sodium thiosulfate is shown as the weight of its hydrate Na2S2O3.5H2O.
[0031]
The carrier used in the present example is B-type silica gel powder described in “JIS Z 0701
packing silica gel desiccant”. The B-type silica gel powder is a silica gel powder having a low
moisture absorption at low humidity, a high moisture absorption at high humidity, and a high
total moisture absorption at high humidity, and has an average particle diameter of about 8 μm.
[0032]
The silica gel powder was dried at 180 ° C. for 2 hours or more. The aqueous solution of silver
thiosulfato complex was mixed so as to be 2 parts by weight as a silver component with respect
to 100 parts by weight of the above silica gel. Then, the water absorbed in the solvent and the
carrier was quickly removed. Then, this was pulverized to a predetermined particle size to obtain
01-05-2019
8
a silica gel carrying an antibacterial material.
[0033]
100 parts by weight of the above silica gel is dispersed in a solution prepared by diluting and
mixing 100 parts by weight of tetraethoxysilane as a reactive organic silicon compound in ethyl
alcohol, and then pure water is added thereto to hydrolyze tetraethoxysilane, At least a portion of
the surface of the silica gel was coated. It was then dried to obtain an antimicrobial composition.
[0034]
1% in the surface coating paint of aluminum die-cast microphone housing, 1% in the surface
coating paint of the polyester net made of a body, and the surface coating of a polyester fiber
non-woven fabric 1% in the paint, 1% in the surface coating paint of the same polyester fiber
non-woven fabric affixed to the surface of the element unit, 1% in the surface coating paint of the
foamed polyurethane resin cushioning material that absorbs vibrations between the housing and
the element unit 1% of each was kneaded.
[0035]
The microphone paint was subjected to an antifungal test and an antibacterial test as described
below for the test coating plate.
The results are shown in Table 1.
[0037]
As a result, good antibacterial and antifungal performance was obtained. It can be seen from
Table 1 that the antibacterial and antifungal composition of this example has practical
antibacterial and antifungal performance.
[0038]
01-05-2019
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In this example, a thiosulfato silver complex salt was used as the antibacterial material, but an
antibacterial material such as a plant extract, a quaternary ammonium salt, or chlorhexidine
gluconate can also be used. Multiple antimicrobial materials can also be used. Furthermore,
coating materials such as waxes and stearic acid compounds can be applied as coating materials
in addition to the above-mentioned organic silicon compounds.
[0039]
It is also possible to use silver nitrate as a water soluble silver salt to prepare the silver complex
salt. It is also possible to use potassium sulfite, ammonium sulfite and the like as sulfite and
potassium bisulfite, potassium metabisulfite, ammonium bisulfite and the like as bisulfite. The
sulfite and the bisulfite can be used alone or as a mixture, and the amount thereof is suitably 400
to 2000 parts by weight with respect to 100 parts by weight of the water-soluble silver salt.
Ammonium thiosulphate can also be used as the thiosulphate, and its amount is suitably 100 to
1000 parts by weight. The average particle diameter of the B-type silica gel powder is suitably 1
to 10 μm. The amount of silver is suitably 2 to 10 parts by weight with respect to 100 parts by
weight of silica gel. The amount of the reactive organosilicon compound is suitably 10 to 200
parts by weight, and tetramethoxysilane can be used instead of tetraethoxysilane.
[0040]
As for the surface coating method of the main body sound pickup part polyester net, the surface
coating was applied after bending it into a spherical shape, but it is also possible to apply a
coating on a raw fabric net and then bend processing.
[0041]
Example 2 An antimicrobial composition prepared by the same method as in Example 1 was
kneaded in a polypropylene resin, and this was used to form a polypropylene non-woven fabric.
It was used as a nonwoven fabric inside the main part sound collection part polyester net, and a
nonwoven fabric stuck on the element unit surface.
[0042]
01-05-2019
10
This nonwoven fabric was subjected to the same antifungal test and antibacterial test as in
Example 1. The results are shown in Table 1.
[0043]
As a result, good antibacterial and antifungal performance was obtained. (Example 3) Allyl
isothiocyanate as a horseradish extract having antibacterial performance among plant extracts,
1% in the surface paint of the polyester net of the main sound pickup part, in the surface paint of
the polyester fiber non-woven fabric 1%, 1% of each was coated in the surface coating paint of
the same polyester fiber non-woven fabric attached to the surface of the element unit.
[0044]
The plant extract additive paint was subjected to the same antifungal test and antifungal test as
in Example 1 on a test coated plate. The results are shown in Table 1.
[0045]
As a result, good antibacterial and antifungal performance was obtained. (Example 4) A material
obtained by kneading and forming 5% of a zinc oxide powder in a resin of a foamed polyurethane
resin buffer material for absorbing vibration between a housing and an element unit was used.
This zinc oxide kneaded material was subjected to the same antifungal test and antibacterial test
as in Example 1. The results are shown in Table 1.
[0046]
As a result, good antibacterial and antifungal performance was obtained. EXAMPLE 5 An
antibacterial composition prepared by the same method as in Example 1 was mixed with 1% and
5% of collagen in a urethane paint as a surface coating paint for an aluminum die-cast
microphone casing, respectively.
01-05-2019
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[0047]
The above-mentioned test coating was subjected to the same antifungal test and antifungal test
as in Example 1. The results are shown in Table 1.
[0048]
As a result, good antibacterial and antifungal performance was obtained.
[0049]
As described above, the microphone of the present invention can be made to have antibacterial
and antifungal properties, and has the effect of improving the cleanliness of the surface of the
microphone used by bringing it close to the mouth.
[0050]
Furthermore, by suppressing the growth of the microorganism, the action of the antibacterial
material which suppresses the offensive odor generated from the microorganism is utilized, and
the odor emitted from the microphone is reduced.
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