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The present invention relates to a flame retardant speaker diaphragm. A diaphragm mainly made
of cellulose fiber has advantages such as small mass, relatively high Young's modulus, and
appropriate internal loss, and also the ability to form paper easily even in complicated shapes,
but it is flammable It has the disadvantage of being vulnerable to fires. Therefore, it is not
suitable for use in a place where the voice coil is heated or ignited due to excessive input, or
where there is a risk of being exposed to high temperatures such as a television scene cabinet,
and it is necessary to be flame retardant. Conventionally, inorganic asbestos is widely used as a
flame retardant material from such a viewpoint. However, since the mass is large, the speaker
sensitivity is bad, and it can not be said that the sound quality is also preferable. On the other
hand, examples of flame retardants for cellulose fibers include boric acid, boron, and chlorine
compounds. However, boric acid and boron have high hygroscopicity, their strength is
significantly reduced, and their mass is also increased. There is a disadvantage that chlorine
compounds generate harmful gases at the time of ignition. The present invention has been made
to solve the above-mentioned drawbacks, and it is an object of the present invention to provide a
speaker diaphragm that is flame-retardant and has a good sound quality. In the present
invention, after impregnating a corn mainly composed of cellulose fiber of wood pulp and bast
mess with an organic phosphorus-containing nitrogen compound containing a low-hol type
melamine resin mixed therein, it is dried by heat treatment to be flame retardant vibration. , Get a
board. In the present invention, as a material of the diaphragm, the use of a paper-made one
instead of a simple sheet is as follows. That is, in order to increase the specific elastic modulus (E
/ ρ) and make the internal loss appropriate, corn is made by paper heating and then subjected
to instantaneous heating (mold) pressing or drying by instantaneous heating in an oven.
Therefore, the surface is hard and the inside is soft. On the other hand, in the case of the sheet,
since the sheet is gradually dried on the roll over time, the surface and the inside have
substantially equal physical properties. Therefore, when impregnating a resin etc. in a cone,
depending on the concentration of the solution, the kind of resin, the curing agent etc., the
degree of impregnation and adhesion to the surface and the inside will be developed at all. Does
not occur. In order to impregnate such a cone with a flame retardant to impart flame retardancy,
it is sufficient if the surface of the corn is covered with the flame retardant, and it is not
necessarily required that the corn be permeated into the corn. Therefore, in the present
invention, impregnation with a flame retardant by impregnating corn with a flame retardant
includes not only ordinary impregnation, but also covering only the surface of corn, but it is
rather high in water absorbability, and thus changes over time. It is important to achieve flame
retardancy by reducing the amount of the flame retardant that is likely to cause a decrease in
Young's modulus as much as possible to achieve flame retardancy, and add other components
such as resin to improve non-water absorbency and Young's modulus and to suppress weight
increase. It becomes.
The organic phosphorus-containing nitrogen-containing compound used as a flame retardant in
the present invention is an alcohol (for example, ethanol, methanol) -soluble one containing a
phosphonic acid derivative as a main component, and harmful gas generating components such
as chlorine and bromine as in the prior art As this organic phosphorus-containing nitrogen-free
compound, for example, a commercially available alcohol solution of 17.1% by weight of
phosphorus and 7.7% by weight of nitrogen can be used. A flame retardant diaphragm is
obtained by impregnating this organic phosphorus-containing nitrogen-containing compound,
but in the present invention, a low-hollar melami resin, a resin having an organic amine salt
added thereto as a catalyst are used. The low-form melamine resin refers to a so-called 3methylolmelamine obtained by reacting formalin and melamine, which is smaller in formalin
content than 6 methylolmelamine, and is used in the alcohol soluble state by condensation. The
use of this low-hol-type melamine resin improves the water absorption by impregnation of the
flame retardant to make it non-hygroscopic, and it is possible to obtain one that exhibits a
compressive strength, a tensile strength and a beautiful appearance with heat resistance
improvement. In other words, according to the present invention, since the internal loss is large
due to being mainly composed of cellulose fiber (and because the mechanical strength (Young's
modulus) is increased by the impregnation of a low-hol type melamine resin, it is excellent. A
diaphragm having frequency characteristics can be obtained. Next, a method of manufacturing a
flame retardant diaphragm will be described. First, for example, a fixed vibration plate mainly
made of 16 cm diameter cellulose fiber is paper-formed. This diaphragm is immersed in a
methanol mixed solution of an organic phosphorus-containing nitrogen compound and a lowform melamine resin, coated with a spray or a heater, and heat-treated under conditions such as
100 ° C. for 15 minutes, and dried. By doing this, it is possible to obtain a lN1 flame-retardant
diaphragm. Vibration □ The desired flame retardancy and hardness of the board can be obtained
by changing the adhesion amount of phosphorus-containing nitrogen compounds to corn or their
compounding ratio, but the adhesion amount to corn is 8 to 20% by weight It is appropriate to
The organic phosphorus-containing nitrogen compound is an alcohol solution of 5 to 205%, and
the compounding ratio of the low-form melamine resin and the organic amine salt is 5 to 20 by
weight; 0.1 to 5: 0. The mixed solution is prepared to be 1 to 3. As described above, in the
present invention, since an alcohol such as methanol is used in a solvent-bound state, it is
possible to rapidly process cellulose fibers which swell in the water system and maintain their
Hereinafter, the present invention will be specifically described by way of examples. EXAMPLE
10 A fixed diaphragm with a diameter of 20 clI was made into a paper sheet, and this molded
product was used as an organic phosphorus-containing nitrogen compound FLAMEGARD 5527
(Dainippon 4 'n * i [L 91) 5%, as a low-hol type melamine resin BECAMINEPM It was immersed in
an alcohol mixed solution of 5% N (made by the same company as above) and 1% organic amine
salt to make the adhesion amount 13.9% by weight. The product was heat dried at 100 ° C. for
15 minutes and subjected to a combustion test. As a result, there was no ignition immediately
after taking out from the accident, and excellent flame retardancy meeting the requirements of
UL standard 94-V-0 was exhibited. The physical property values of the diaphragm and the nontreated article subjected to the flame retarding treatment according to the present invention are
shown. As apparent from the table, the incombustible treatment can increase the internal loss
without substantially reducing the Young's modulus. Example 20 A fixed diaphragm with a
diameter of 16011 was made into a paper sheet, and this was immersed in an alcohol mixed
solution of FLAMEGARD 20%, BECKAMINE RM-N 1%, organic amine salt 0.5%, and then heated at
100 ° C. for 15 minutes. It was dry. When this diaphragm was subjected to a combustion test, as
in Example 1, one having a degree of flame retardancy meeting the requirements of UL Standard
94-V-0 was obtained. The drawings show frequency sound pressure characteristics of the
diaphragm and the conventional product (untreated product) obtained at this time, wherein the
solid line represents the product of the present invention and the dotted line represents the
conventional product. As is clear from the figure, the product of the present invention exhibits
the same characteristics as the conventional one over the entire frequency range, and also has
excellent moisture resistance and mechanical strength, so there is no concern for moisture
absorption, deformation, etc., and long-term stable quality Is obtained. Since the present
invention is as described above, it is possible to provide a speaker diaphragm that is flame
retardant and has good sound quality.
Brief description of the drawings
The drawings show frequency sound pressure characteristics of the present invention and a
conventional diaphragm, wherein the solid line is the product of the present invention and the
dotted line is the conventional product.
Patent Assignee Pioneer Corporation Domoto Co. Mogami Electric Co., Ltd.
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