JP3283268B2 - Speaker assembly method - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for assembling a loudspeaker using a contact-type adhesive which can be bonded without using a solvent and without heating.

[0002]

2. Description of the Related Art FIG.
As shown in FIG. 1, the frame 1, the cone paper 2, the cone edge 3, the gasket 4, the voice coil 5, the damper 6, the dust cap 7, the top plate 8, the ferrite magnet 9, the bottom plate 10 and the like,
These members are appropriately joined with an adhesive at joints a, b, c, d, e, f, and g and assembled into a speaker. A chloroprene-based adhesive has been widely used as an adhesive used for the joining of the above-mentioned a to e. This chloroprene-based adhesive takes a predetermined open time after the adhesive is applied and emerges. In the contact-type bonding in which adhesion is performed by utilizing the adhesiveness, there is a disadvantage that initial adhesion strength due to adhesion cannot be obtained by single-sided application. In addition, there is a drawback in that, when bonding is performed immediately after application, a jig for fixing is required until the initial adhesive strength is developed. Further, the chloroprene adhesive has a solid content of 30 to 3
Since the solvent-type adhesive is 5% by weight, there is a problem in the working environment such as a risk that a large amount of the solvent volatilizes during the solidification and damages health or causes a fire.

[0003] In addition, the joints f and g, which contact the magnetic field of the speaker, need to have sufficient adhesive strength. For this reason, as the adhesive used for the joints f and g, an adhesive such as an epoxy-based adhesive, a microcapsule-type acrylic-based adhesive, a two-part acrylic-based adhesive, or an α-cyanoacrylate-based adhesive is used. Used in combination with an .alpha.-cyanoacrylate-based adhesive and a room temperature moisture-curable adhesive (a conventional moisture-curable adhesive having no contact adhesiveness) (Japanese Patent Laid-Open No. 1-12)
No. 9700) is also known.

[0004] The ordinary temperature-curable epoxy adhesives have the disadvantage that special equipment is required for accurately and automatically metering and mixing the two liquids.

[0005] The microcapsule type acrylic adhesive is
It is excellent in workability because it cures in a short time at room temperature with one liquid. However, it does not cure unless microcapsules are destroyed, and there is a disadvantage that the protruding portion of the adhesive is uncured.

[0006] The two-component acrylic adhesive requires a facility for mixing the two components, and has the disadvantage that the ferrite of the adherend may be broken because the cured product is hard and brittle. .

[0007] The α-cyanoacrylate adhesive is a one-part adhesive, can be cured at room temperature in a short time, and has excellent workability, but has low impact resistance, moisture resistance, and heat aging resistance. There was a disadvantage that the bonding performance was poor.

[0008] In the case of bonding using a combination of an α-cyanoacrylate adhesive and a normal-temperature moisture-curable adhesive (conventional moisture-curable adhesive having no contact adhesiveness), two liquids are applied, and the two liquids are applied accurately so that they do not overlap. However, there is a disadvantage that special equipment for positioning is required.

As described above, the conventional bonding methods for assembling a speaker have respective problems, and none of them are sufficiently satisfactory. In particular, bonding to each of the joints a to g of the speaker can be performed with one adhesive. Nothing could be done.

[0010]

SUMMARY OF THE INVENTION The inventor of the present invention has made intensive studies to solve the above-mentioned disadvantages of the bonding method for assembling a speaker, and has found that a moisture-curable adhesive reacts and cures with moisture at room temperature to form a film. The present invention has been completed by paying attention to the appearance of tack in the process of forming a film, and actively utilizing this tack for contact bonding.

According to the present invention, unlike conventional solvent-type rubber-based adhesives, since it does not contain a solvent, it is safe in terms of hygiene and fire, and since a contact-type adhesive is used, it can be fixed immediately and the bonding method is simple. No need for temporary holding after lamination, easy bonding work, can bond any joints, cures at room temperature, and even short joints without moisture permeability An object of the present invention is to provide a speaker assembling method and an adhesive for assembling a speaker which are sufficiently cured in a long time and have excellent workability.

[0012]

In order to solve the above-mentioned problems, a method for assembling a loudspeaker according to the present invention comprises the steps of: ( a) having a reactive silicon group, wherein the molecular chain is substantially (i) the number of carbon atoms; Acrylic acid having 1 to 8 alkyl groups
Alkyl ester monomer units and / or methacrylic
Acrylic acid having an alkyl acrylate monomer unit and (ii) an alkyl group having 10 or more carbon atoms
Acid alkyl ester monomer units and / or
Copolymerization with alkyl acrylate monomer units
Body, (b) or the oxyalkylene polymer having reactive silicon groups
The moisture-curable adhesive consisting of
After coating the joint was left for a predetermined time to express tack (took open time) was the expression tack
The above-mentioned members are stuck together by utilizing the above . All the joints of the members constituting the speaker may be bonded using the moisture-curable adhesive of the present invention, but at least one of these joints is bonded with the moisture-curable adhesive of the present invention. In this case, the remaining joints are joined using a conventionally known speaker adhesive.

In the method of assembling a speaker using a novel contact-type adhesive according to the present invention, a tack generated in the process of forming a film by reacting the adhesive layer from the air or with the forcedly supplied moisture is used. . For this reason, if the adhesive layer is too thick, the film formation becomes too uneven,
The generated tack force is insufficient, and it is difficult to exhibit the contact property.

The moisture-curable adhesive used in the present invention includes (a) a silicone-based adhesive and a modified silicone-based adhesive comprising a compound (A) having at least one reactive silicon group in a molecule; b) a urethane adhesive comprising a compound (B) having one or more isocyanate groups in the molecule;
(C) Special type epoxy adhesives composed of the above (A) and / or (B) and a compound having an epoxy group, and the like.

A specific example of the compound (A) having one or more reactive silicon groups in the molecule is described in JP-A-50-1565.
No. 99, Japanese Patent Application Laid-Open No. 52-73998, Japanese Patent Publication No. Sho 5
Compounds proposed in JP-A-8-10418, JP-A-62-230822, etc.
Japanese Patent Application Laid-Open No. Sho 60-228516 and Japanese Patent Application Laid-Open No. 63-112642, as disclosed in Japanese Patent Application Laid-Open No. Sho 60-228516 and Japanese Patent Application Laid-Open No. 63-112642, each having at least two or more silicon atoms bonded to a hydrolyzable group in a molecule. JP-A-1-131271
There is a composition such as a composition comprising an oxyalkylene polymer having a silicon group and a (meth) acrylate (co) polymer having a silicon group, which is proposed in Japanese Patent Application Laid-Open Publication No. H11-209,878.

In particular, Japanese Patent Application Laid-Open No. 63-112,642 discloses (a) an alkyl acrylate having a reactive silicon group and a molecular chain substantially having (1) an alkyl group having 1 to 8 carbon atoms. An ester monomer unit and / or a methacrylic acid alkyl ester monomer unit;
A copolymer consisting of an acrylic acid alkyl ester monomer unit having 0 or more alkyl groups and / or a methacrylic acid alkyl ester monomer unit, and (b) curing comprising an oxyalkylene polymer having a reactive silicon group. When the adhesive composition is used, one having excellent adhesive properties (for example, tack range) can be obtained. Here, the reactive silicon group is a silicon-containing functional group which can be crosslinked by forming a siloxane bond, and a typical example thereof is represented by the following general formula (I)
It is represented by

[0017]

Embedded image (Wherein, R ¹ is a substituted or unsubstituted monovalent organic group having 1 to 20 carbon atoms or a triorganosiloxy group, X is a hydroxyl group or a different or similar hydrolyzable group, and a is an integer of 0, 1 or 2) , B is an integer of 0, 1, 2, or 3, and a = 2
Does not become b = 3, and m is an integer of 0 to 18. )

Preferred reactive silicon functional groups from the viewpoint of economy and the like are groups represented by the following general formula (II).

[0019]

Embedded image (In the formula, R ¹ is the same as described above, and n is an integer of 0, 1, or 2.)

In order to make the method of assembling a speaker using the adhesive of the present invention more effective, the above (a), (b),
(C) a tackifier such as a vinyl compound such as a vinyl chloride (co) polymer, a phenol resin compound, a petroleum resin, a terpene-phenol resin, or a rosin ester resin in the adhesive of JP-A-63-291918; (Meth) acrylate compounds such as epoxy resin, butyl acrylate (co) polymer, etc. which have been previously reacted as proposed in the above.

The adhesive usable in the method for assembling a speaker according to the present invention is obtained by mixing 0.1 to 10 parts of a curing accelerator with 100 parts of the above compound.

Examples of the curing accelerator include organic tin compounds, acid phosphates, reaction products of acid phosphates with amines, saturated or unsaturated polycarboxylic acids or acid anhydrides thereof, and organic titanate compounds. No.

Specific examples of the organotin compound include dibutyltin dilaurate, dioctyltin dimaleate,
Examples include dibutyltin phthalate, stannous octoate, dibutyltin methoxide, dibutyltin diacetyl acetate, dibutyltin diversate, and the like.

Examples of the organic titanate compound include titanates such as tetrabutyl titanate, tetraisopropyl titanate and triethanolamine titanate.

If necessary, the adhesive may contain a diluent (phthalate plasticizer such as dioctyl phthalate or butyl benzyl phthalate, plasticizer such as epoxidized soybean oil, methanol, ethanol, toluene, etc.). Solvents, reactive diluents, etc.), fillers (heavy calcium carbonate, light calcium carbonate, colloidal calcium carbonate, kaolin, talc, silica, titanium oxide, aluminum silicate, magnesium oxide, zinc oxide, carbon black, etc.), An adhesion-imparting agent (such as a silane coupling agent such as aminosilane or epoxysilane), a sagging agent, a coloring agent, and a preservative can be added.

The adhesive which can be used in the present invention is a special type of epoxy resin obtained by combining the above adhesive with an epoxy resin such as bisphenol A diglycidyl ether and a generally known epoxy curing agent. There is glue.

In particular, when a modified silicone compound is used as the moisture-curable adhesive, the expression of tackiness is increased and the storage stability is improved, so that the object of the present invention can be sufficiently achieved. .

As the form of the adhesive, a one-part type is easier to use, but it can be applied to a one-part type or a two-part type.

The application of the adhesive may be performed on both sides or one side of the adherend similarly to the rubber-based contact adhesive.
In the speaker assembling method of the present invention, sufficient adhesive performance can be exhibited by both-side application and single-side application.

The method of applying the adhesive is not particularly limited.
Known means such as a hand, a spatula, a roll coat, and a spray may be used.

Further, in order to promote the development of tack and the hardening, heating, humidification, and the like can be performed as necessary.

Tack is generated in a process in which the adhesive layer reacts with the moisture in the air to form a film. If the thickness of the adhesive is too large, the film is not formed uniformly, and the generated tack force is insufficient. , And it is difficult to develop contact properties. Therefore, if the thickness of the adhesive applied to the adherend is set to 1 mm or less in the main part, the appearance of tack becomes easy.

[0033]

According to the speaker assembling method of the present invention, a solvent which is a major problem of the solvent type rubber-based adhesive is contained by actively using the moisture existing in the atmosphere by using a moisture-curable adhesive. The most significant feature is that it can be used in the same convenient manner as the conventional solvent-type rubber-based contact adhesive without performing. Also, in the method of the present invention, despite the use of a type of adhesive that cures with moisture,
In a known bonding method using a conventional moisture-curable adhesive,
It is possible to fix the joint of the speaker in a short time at room temperature, which could not be achieved. Further, if the joint of the speaker coated with the moisture-curable adhesive of the present invention is actively humidified to shorten the open time, the working time can be further reduced.

[0034]

Embodiments of the present invention will be described below. Synthesis Examples 1 to 5 Synthesis Example 1 of JP-A-63-112842
(Meth) acrylic acid ester-based polymers as shown in Table 1 were obtained in accordance with Nos.

[0035]

[Table 1]

The notes in Table 1 are as follows. * 1: manufactured by Mitsubishi Rayon Co., Ltd. acrylic ester S * 2: Mitsubishi Rayon Co., Ltd. C _12, C ₁₃ mixed alkyl methacrylate * 3: .gamma.-methacryloxypropyl trimethoxysilane * 4: .gamma.-mercaptopropyltrimethoxysilane Methoxysilane * 5: Azobisisobutyronitrile * 6: γ-methacryloxypropylmethyldimethoxysilane * 7: γ-mercaptopropylmethyldimethoxysilane * 8: GPC measurement.

Synthesis Examples 6 and 7
According to Synthesis Examples 8 and 9 of the publication, the following formula (I)
A polyoxypropylene having the group of II) was obtained.

[0038]

Embedded image

Example 1 Using the adhesive composition C shown in Table 2, a joint f between the top plate 8 and the ferrite magnet 9 and a joint g between the ferrite magnet 9 and the bottom plate 10 were joined.

In a room at 40 ° C. and a relative humidity of 80%, the adhesive composition C was applied to the top plate 8 and the bottom plate 10 having a diameter of 120 mm and thinned and spread. Was pressed for 5 seconds with a weight of 5 kg, immediately showing the initial practical adhesive strength due to adhesion, the top plate 8, the ferrite magnet 9 and the bottom plate 10.
And the ferrite magnet 9 were bonded. After leaving this cured product at 20 ° C. for 7 days and curing it,
For 5 hours at 120 ° C for 2 hours.
Cycling was performed to observe the occurrence of cracks in the ferrite. As a result, no cracks were observed in any of the joints in any combination.

When a similar joint after leaving and curing at 20 ° C. for 7 days was dropped from a height of 1 m onto a concrete surface, the test was repeated 20 times. As a result, none of the joints was peeled off at all. Was.

[0042]

[Table 2] Notes in Table 2 are as follows. * 1: Polymer of Synthesis Example 6. * 2: Composition of the polymer of Synthesis Example 1 and the polymer of Synthesis Example 6. * 3: Composition of the polymer of Synthesis Example 1 and the polymer of Synthesis Example 7. * 4: Silyl 5B25, trade name (modified silicone compound) of Kanegafuchi Chemical Industry Co., Ltd., terminal silyl group, polypropylene oxide based on main chain structure. * 5: Takenate L1003, a trade name of Takeda Pharmaceutical Company Limited, a polyether polyol having a terminal isocyanate group. * 6: Dibutyltin oxide solution, solution dissolved in equimolar dioctyl phthalate. * 7: N-β- (aminoethyl) aminopropyltrimethoxysilane. * 8: Shiraishihana CCR, Shiraishi Calcium Co., Ltd.,
Surface treated calcium carbonate. Comparative Example 1 A commercially available two-part acrylic adhesive (manufactured by Cemedine Co., Ltd.)
A joint f between the ferrite magnet 9 having a diameter of 120 mm and the top plate 8 and the bottom plate 10 similar to those in the first embodiment, using trade name Cemedine Y400).
When the bonding portion g was bonded to the ferrite magnet 9, a jig for fixing was required because of no initial adhesiveness. Next, the same cold and heat repetition test as in Example 1 was performed on the bonded product left standing and cured at 20 ° C. for 7 days. As a result, cracks occurred in the ferrite.

Example 2 Using the adhesive composition C shown in Table 2, a joint a between the cone edge 3 and the edge of the frame 1 was joined. In a room at 40 ° C. and a relative humidity of 80%, the adhesive composition C was thinly applied to the edge of the frame 1 on one side, and after taking an open time of 10 minutes, the cone edge 3 was overlapped and pressed for 5 seconds. Immediately, the initial practical adhesive strength due to adhesion was exhibited. When the cone paper was pulled after being left and cured at 20 ° C. for 1 hour, the cone paper 2 was broken, and good adhesive strength was obtained even when applied on one side.

Comparative Example 2 The same bonding as in Example 2 was performed using a commercially available chloroprene rubber adhesive for speaker assembly (Cemedine CS4503, manufactured by Cemedine Co., Ltd.). Cemedine C
S4503 was thinly applied to the edge of the frame 1, and after taking an open time of 10 minutes, the cone edge 3 was overlapped, pressed for 5 seconds, and immediately pulled the corn paper 2. Adhesiveness did not occur and practical adhesive strength was not reached. When the cone paper 2 was pulled after one hour as in Example 1, the cone paper 2 was peeled off.

When the chloroprene rubber-based adhesive (Cemedine CS4503, trade name, manufactured by Cemedine Co., Ltd.) was thinly applied to the edge of the frame 1, the cone edge 3 was superimposed. Therefore, a fixing jig was required.

Further, the above-mentioned chloroprene rubber-based adhesive (trade name: Cemedine CS450, manufactured by Cemedine Co., Ltd.)
Since 3) is a solvent-type adhesive, a large amount of solvent is volatilized in the air in order to solidify the adhesive, which involves a problem in working environment.

Example 3 Using the adhesive composition C shown in Table 2, a joint b between the cone paper 2 and the lead wire was joined. In a room at 40 ° C. and a relative humidity of 80%, the adhesive composition C is thinly applied to the corn paper 2 and
After taking an open time of 0 minutes, the lead wires were overlapped and lightly pressed, immediately showing the initial practical adhesive strength due to adhesion, and one hour later, the lead wire was pulled, and the cone paper 2 broke. .

Example 4 Using the adhesive composition C shown in Table 2, the joint c between the cone paper 2 and the dust cap 7 was joined. The adhesive composition C was thinly applied to the cone paper 2 in a room at 40 ° C. and a relative humidity of 80%, and after taking an open time of 10 minutes, the dust cap 7 was overlapped and lightly pressed. When the dust cap 7 was pulled after one hour, the cone paper 2 was broken.

Example 5 A damper 6 and a frame 1 were prepared by using the adhesive composition A shown in Table 2.
The joining part d between them was joined. 40 ° C, relative humidity 80%
In the room, the adhesive composition A is thinly applied to the frame 1,
After taking an open time of 10 minutes, the dampers 6 were overlapped and lightly pressed, immediately showing the initial practical adhesive strength due to adhesion, and one hour later, the dampers 6 were broken when pulled.

Example 6 Using the adhesive composition B shown in Table 2, a three-point joint e between the damper 6, the voice coil 5, and the cone paper 2 was joined. Adhesive composition B in a room at 20 ° C. and 65% relative humidity
Was applied to the contact portion between the damper 6 and the voice coil 5 using a thin tube, and the cone paper 2 was overlaid. When the damper 6 was pulled after being left and cured at 20 ° C. for 1 hour, the damper 6 was broken.

Comparative Example 3 Joining of the joints be in the same manner as in Examples 3 to 6 using a commercially available chloroprene rubber adhesive for speaker assembly (Cemedine CS4503, manufactured by Cemedine Co., Ltd.) Was done.

Since the chloroprene rubber-based adhesive (Cemedine CS4503, manufactured by Cemedine Co., Ltd.) is a solvent-type adhesive, a large amount of solvent is volatilized in the air in order to solidify the adhesive. This included problems in the work environment.

The above chloroprene rubber-based adhesive (trade name: Cemedine CS4503, manufactured by Cemedine Co., Ltd.)
However, in the case of single-sided application, an initial bonding strength due to adhesion could not be obtained, and thus a sufficient bonded product could not be obtained.

[0054]

As described above, according to the present invention,
Unlike conventional solvent-based rubber-based adhesives, a moisture-curable adhesive that does not contain a solvent is used, so it is safe for hygiene and fire, and since the adhesive used is a contact type and can be fixed immediately, the bonding method is simple. No need for temporary holding after lamination, easy bonding work, unlike water-based contact type (aqueous emulsion type) adhesive, bonding part is not limited, and any bonding part is bonded with one adhesive Because it can be cured at room temperature, it does not require heating except for special applications, and the adhesive of the present invention can be used to bond joints without moisture permeability unlike conventional moisture-curing adhesives. It cures sufficiently in a short time, and the properties after curing have elasticity, so that the ferrite magnet does not crack, and the conventional solvent-type contact adhesive will adhere unless applied on both sides (for single-sided application) Although it is difficult, the present invention has also sufficient bonding strength in the single-side coating, heating, if humidified shorter open time, it is possible to achieve a significant effect that the reduction of working time.

[Brief description of the drawings]

FIG. 1 is a longitudinal sectional view of a typical speaker including a speaker assembled using the assembly method of the present invention.

[Explanation of symbols]

 1 Frame 2 Cone paper 3 Cone edge 4 Gasket 5 Voice coil 6 Damper 7 Dust cap 8 Top plate 9 Ferrite magnet 10 Bottom plate a, b, c, d, e, f, g Joint of each member

Continued on the front page (72) Inventor Shoji Uehara 4-59-9 Higashi-Gotanda, Shinagawa-ku, Tokyo Inside (72) Inventor Kei Kei Naoki 4-59-9 Higashi-Gotanda, Shinagawa-ku, Tokyo Inside Cemedine Corporation (56) References JP-A-61-111098 (JP, A) JP-A-63-112642 (JP, A)

Claims (5)

(57) [Claims] (1) a) having a reactive silicon group and having a molecular chain
Qualitatively (i) Acrylic acid having an alkyl group having 1 to 8 carbon atoms
Alkyl ester monomer units and / or methacrylic
Acrylic acid having an alkyl acrylate monomer unit and (ii) an alkyl group having 10 or more carbon atoms
Acid alkyl ester monomer units and / or
Copolymerization with alkyl acrylate monomer units
Body, (b) or the oxyalkylene polymer having reactive silicon groups
The moisture-curable adhesive consisting of
After coating the joint was left for a predetermined time to express tack (took open time) was the expression tack
A speaker assembling method using a contact-type adhesive, wherein the above members are attached to each other by utilizing the above method. 2. The reactive silicon group forms a siloxane bond.
A silicon-containing functional group that can be cross-linked by forming
And the general formula (I): (Wherein R ¹ is a substituted or unsubstituted C 1-20)
Monovalent organic group or triorganosiloxy group, X is hydroxyl
Group or a different or similar hydrolyzable group, a
Or an integer of 2, b is an integer of 0, 1, 2, or 3, and a = 2
And b does not become 3; m is an integer of 0 to 18)
The method for assembling a speaker according to claim 1, wherein the speaker is assembled. 3. The reactive silicon group has a general formula (II): ( Wherein R ¹ is the same as above, and n is an integer of 0, 1 or 2)
Claim 1 or characterized in that it is a group represented by the number)
2. The method for assembling the speaker according to 2 . 4. A method for connecting each member constituting a speaker to a joint portion.
Make sure that the thickness of the adhesive applied is 1 mm or less in the main part.
The speaker according to any one of claims 1 to 3, characterized in that:
Assembly method. 5. A method according to claim 1, wherein
A speaker characterized by being assembled by: