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JPS55137799

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DESCRIPTION JPS55137799
DESCRIPTION OF THE PREFERRED EMBODIMENTS Adhesive Composition for Speaker Device
Assembly 1 Adhesive composition for speaker device assembly used at the joint of each member
forming the speaker device, wherein the adhesive composition is a one-part urethane. Fast cure
adhesive compositions comprising an adhesive and containing 50 to 100% by weight solids.
2, the scope of claims
3. Detailed Description of the Invention The present invention relates to an adhesive composition
for speaker device assembly having a low solvent content and a high curing speed. The speaker
device used for various audio equipment such as stereo is formed from one frame 1, frame cone
paper 2, cone edge 3, gasket 4, voice coil 5, damper 6, center cap 7 and other various members
as apparent from the drawing. , The joints (in the drawing, AXB, C, D, E, etc.) are assembled by
adhesive bonding. Conventionally, chloroprene-based adhesives have been widely used as
adhesives used for the above-mentioned joints. However, since this chloroprene-based adhesive
has a solid content of only about 30 to 36% by weight and contains a large amount of solvent, it
takes a long time for the solvent to evaporate and exhibit sufficient adhesion. In order to reduce
this time, a process such as heating is required. An object of the present invention is to provide
an adhesive composition for assembling a speaker device, which has a low solvent content and a
high curing speed, and which has the disadvantages of the prior art described above. In order to
achieve the above-mentioned object, according to the present invention, in the adhesive
composition for speaker device assembly used at the joint of each member forming the speaker
device, the adhesive composition is a one-part urethane adhesive. And 50 to 100% by weight of
solid content. The above-mentioned adhesive composition according to the present invention
contains, as an example, a one-component urethane adhesive as a raw material, and further
contains a solvent etc. as required, and further, the solid content 50- It is prepared at 100% by
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weight and at a viscosity of 100 to 20,000 cps. As one-component urethane adhesives described
above, polyether-based cyanate adhesives containing a polyether and diphenylmethane
diisocyanate having functional groups 2 to 5 as main components, and optionally containing
stabilizers, reaction accelerators, etc., or Polyester-based cyanate adhesive using a polyether-sini
polyester is used, and as the above-mentioned solvent, a fatty acid ester solvent such as ethyl
acetate, a chlorinated solvent such as methylene chloride, an aromatic hydrocarbon solvent such
as toluene And others are used. Since the adhesive composition thus formed contains a onecomponent urethane adhesive as a main component, it has a faster curing rate than a
chloroprene adhesive, and contains 50 to 100% by weight of solid content. Require a longer time
for solvent volatilization as compared to conventional chlorobrene adhesives (solid content: 30 to
36% by weight) (that is, since the solvent content is very low and no solvent can be expected).
Because of this, if this adhesive composition is used for assembling a speaker device, the
speeding up of the production process is expected, and the practical advantage is extremely
large.
An example used for assembling the speaker device is shown in FIG. According to FIG. 1, the
adhesive composition of the present invention is used for the contact portion A between the
frame 1 and the damper 6, and further the contact portion B1 between the frame 1 and the cone
edge 3 the damper 6 and the voice coil 5 and the frame cone paper 2 Used in the contact area D
between the C1 cone edge 3 and the gasket 4 and the contact area E between the frame cone
paper 2 and the center cap 7 and so on, which cures in a short period and the solvent is
volatilized. Work is speeded up significantly. In FIG. 1, 8 is a plate, 9 is a mug, 10 is a yoke, 11 is
a lead wire, and 12 is a terminal. Hereinafter, the present invention will be described in detail by
way of examples. EXAMPLE 1 A polyether based isocyanate 4-to-2 adhesive composition
containing a polyether and a diphenylmethane diisocyanate compound having a functional group
of 2 to 5 and a stabilizer, a reaction accelerator, ethyl acetate and the like is prepared to have the
following properties. ONCO (%) 13.2 solid content 87 wt 7% viscosity 1000 cps The above
adhesive composition was applied 150 μ thick to a chromate-processed iron plate under an
atmosphere of 5 ° C. and 65% RH. The apparent setting time was (9) minutes. Also, using the
chromate-processed steel sheet and No. 9 campus, the adhesive composition was adhered
immediately after application, and the 180 degree peel strength after the lapse of the day was
measured at a tensile speed of 50 m / min, showing a strength of 7.1 kLi / 25 t7 n Indicated. In
addition, the peel strength of the above-mentioned adherend after four days under an
atmosphere of 45 ° C. and 100% RH was 3.9 Ay / 2.5 cnl. Furthermore, the strength at 150 °
C. was [email protected]/2.5 cm. Example 2 An adhesive composition was prepared in the same manner as in
Example 1 except that polyester was used for polyether substitution and methylene chloride was
used for ethyl acetate substitution, and the following properties were obtained. NGO (%) 10.0
solid content (wt%) 85 viscosity 1200 cps The above adhesive composition was tested in the
same manner as in Example 1, and the following results were obtained. The apparent hardening
time is 25 minutes, normal temperature peel strength 6.8Ail / 25cmEndPage: 2 moisture
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resistant peel strength5. O # / 25 cm 150 ° C peel strength 2.5 kg / 25 crt. Example 3 When
using the adhesive composition of Example 1 and 2 and bonding the junction part (D) of corn
edge-gas mat in an atmosphere of 25 ° C., 65% RH, it solidified in all in 25 minutes (by hand)
The paper did not move, and pulled the paper after an hour and broke the paper. Bonding of the
crevice-damper joint (A) and the damper-voice coil-frame cone paper 3-point joint (C) was carried
out, and after one hour, the damper and the cone paper were pulled and broken.
4. Brief Description of the Drawings The drawings are cross-sectional views of the speaker device
showing respective members of the speaker device and their junctions. l · · · · · · · · · · · · · · · · · · · · · ·
· · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · Gasket , D, E ... junction
EndPage: 3
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