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JPS5787695

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DESCRIPTION JPS5787695
Description 1, title of the invention
Domed diaphragm
8. Detailed Description of the Invention The present invention relates to a dome-shaped
diaphragm in which a flexible base fabric is formed into a dome shape. Conventionally, a domeshaped diaphragm formed by molding a flexible base fabric into a dome shape is made by
impregnating a flexible base fabric such as cotton or silk cloth with a phenol resin as a shaperetaining resin, and then heating and pressing to form a predetermined dome shape. After
forming the shape, apply soft and airtight holding resin such as acrylic resin after shape
completion, or impregnate the base cloth with shape holding resin, impregnate the soft airtight
holding resin, and then heat it. It has a structure in which it is pressurized and formed into a
dome shape, and at the same time soft air tightness is imparted. However, since this conventional
dome-shaped diaphragm is hard and brittle, the phenol resin as shape-retaining resin is hard and
brittle, it has small flexibility and sufficient elasticity, and its internal loss against vibration is
extremely small. In addition, because the internal resistance against vibration is not tagged only
by the soft airtight resin alone, partial resonance or abnormal vibration in the divided vibration
region, or reflection phenomenon at the edge of the vibration wave. The vibration attitude is
disturbed, and harmonic distortion is generated, so that there is a defect that excellent sound
quality can not be obtained. The present invention has been made to improve the conventional
defects as described above, and is characterized in that a modified phenol resin in which phenol
and polybutadiene are chemically combined and integrated as a shape-retaining resin is used. is
there. After the reaction between the mixture and polybutadiene in the presence of an acid
catalyst, a single 4fc of an oligomer of Sugachi, isopropenyl phenol or inpropenyl phenol is
further reacted in the presence of EndPage 1 of phenol and acid catalyst, and then The modified
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phenol resin obtained by reacting the reaction product with formaldehyde as part of a phenol
component is used as a resin for shape retention, and the resin for shape retention is included in
a base fabric. The impropenyl foils or oligomers thereof used in the present invention are
compounds represented by the general formula I, If, 1. (In the formula LI, n represents an integer
of 0 to 18) In each of the above formulas, the hydroxyl group may be located at any of the ortho,
meta or para positions, or a mixture thereof. Monomers, dimers and trimers can be synthesized
as pure compounds, but tetramer or higher oligomers coexist as a mixture, and these monomers
and oligomers may be either alone or in the form of a mixture. The polybutadiene used in the
present invention is a polybutadiene homopolymer and a polybutadiene homopolymer, and the
butadiene component may be a single structure or a mixture of a 1.2 structure or a 1.4 structure.
In addition, although there are various polybutadienes having different terminal groups, such as
polybutadiene glycol, polybutadiene carponic acid, epoxidized polybutadiene, Fretanized
polybutadiene and the like, there are no restrictions due to the terminal groups, etc., and all
polybutadienes are not limited. Can be used, and examples of the polyphenylene butadiene
polymers include acrylonitrile-butadiene copolymer and the like. Examples of phenols used in the
present invention include phenols, alkylphenols such as cresol and xylenol, and polyphenols such
as bisphenol A and phenylphenol. The above-mentioned modified phenolic resin can be obtained,
for example, by the following method, but is not limited thereto. (Example) P-inpropenyl phenol
dimer 90% by weight, trimer and 10% by weight luisopropenyl phenol oligomer-102f having a
composition of 10% by weight Polybutadiene having a number average molecular weight of 650
C. Sumi Force Oil IP 50) 102f and / or Nilphenol 103f were charged under stirring at
115.degree. C. with stirring and 0.81 f of di-P-l-enesulfonic acid was added and stirred for 3
hours (first stage modification). Further, 147 v of phenol was added and reacted at 170 ° C. for
2 hours (second stage denaturation). After the reaction, 37% formalin 1959. 25% ammonia 9.12
was added and allowed to react at 95 ° C. for 6 hours. Water was removed under reduced
pressure, and when the contents reached 90 ° C., dehydration was stopped and cooled, and
dissolved in a mixed solvent of hexane, methanol and acetone 1: 9: 1 to obtain 50% resin
concentration of pheno. In the above example, although the method for obtaining novolac type
resin by reacting with formaldehyde under acid condition is described, after partially reacting
under acidity, it is made alkaline and then made to react with formaldehyde and subsequently
novolac type resin. -A method of obtaining a resol-type resin, or a method of partially making an
alkaline or none resol-type resin after a modification reaction is possible. The present invention
further dissolves the modified phenolic resin fes having a resin concentration of 50% obtained in
this manner in 2% in methanol to form a modified phenolic resin varnish having a resin
concentration of 25%, and this modified phenolic resin fes is cotton, silk, A base fabric made of
synthetic fibers is impregnated, dried, and then impregnated or coated with a soft airtight resin
solution such as an acrylic ester emulsion solution and dried. Thereafter, heat and pressure are
applied at 180 ° C. for 1 minute to form a dome shape, and at the same time soft air tightness is
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given to complete a dome shaped diaphragm.
As described above, the modified phenolic resin used in the present invention is (1) a method in
which phenols are further introduced into the polybutadiene (first step modification) into which
isopropenyl phenol or an oligomer thereof is introduced (second step modification) As it can be
obtained, a large amount of phenyl ridges can be introduced into polybutadiene, thereby
increasing (1) the crosslink density of the resin and imparting both the rowiness of the phenol
resin and the viscoelasticity of the polybutadiene, (2) Because it has physical properties such as
uniformity, cracking resistance, impact resistance, cold resistance, moisture resistance,
dimensional stability, flexibility, etc., such a modified phenolic resin is used as a shape-retaining
resin The dome-shaped diaphragm according to the present invention is particularly (1) flexible,
strong, and visco-elastic, so that the large amplitude vibration due to the large input, long In the
continuous use of the resin, there is no breakage or deterioration of the vibration characteristics,
and (2) the modified phenol resin itself has visco-elasticity, thereby providing an appropriate
internal loss against vibration in cooperation with the soft airtightness holding resin. Therefore,
partial resonance and abnormal vibration in the divided vibration region and reflection
phenomena at the edge of the vibration wave are effectively absorbed, and a vibration shape
closer to the ideal can be obtained, so that excellent sound quality without harmonic distortion
can be obtained. And so on. Patent Assignee Onkyo Co., Ltd. Attorney Patent Attorney Saita Club
EndPage: 3
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