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Description 1, title of the invention
Molding material
3. Detailed Description of the Invention The present invention relates to a molding material
obtained by mixing and thoroughly kneading 1, polyvinyl chloride (hereinafter referred to as
PvO) pitch and graphite powder (-flake graphite). Hardly, the material used for forming the
moving plate for numbering machines, in particular the diaphragm of the speaker, is efficiently
and faithfully reproduced over a wide frequency band when formed on the thin plate of the
diaphragm tag , S amount, rigidity is large, and Young's modulus E and t, the ratio X / ρ of the
concealed ρ, are required. Conventionally, wood pulp, synthetic resin, aluminum, titanium and
the like have been used from these points, but it is difficult if any of them has sufficient
characteristics. An example using a carbon-based material is a composite material of carbon fiber
and a synthetic resin, but due to the lubricity of the surface of the carbon fiber itself, the bonding
of the carbon fiber by the synthetic resin is not sufficient. Due to the large anisotropy of carbon
fiber, it is not possible to obtain high rigidity as a surface like a diaphragm. Therefore, a
diaphragm which is obtained by carbonizing or graphitizing a synthetic resin material by
focusing on carbon as a material which is light in weight and large in rigidity and has a large
ratio X / ρ of Young's modulus 罵 to density ρ. In the carbonization process and the
graphitization process of the synthetic resin, a large amount of shrinkage and deformation of the
material 2EndPage: 1 was severe, and a parting group causing cracks etc. was confirmed. The
present invention is such a point KIl, its purpose is carbonization or graphitization and acoustic
II! In manufacturing a dexterous diaphragm, it is a light-weight, high-rigidity sound with a large
ratio of Young's modulus to the workman's X / が! It is an object of the present invention to
provide a molding material which is capable of obtaining a container loss and which does not
cause deformation of the material produced in the step of carbonization or graphitization. That is,
the present invention provides a molding material obtained by forming PvC into a pitch shape
and kneading with a graphite powder to obtain a carbon material 1 having a large C Young's
modulus and a high mechanical strength. It is necessary to carbonize hard raw materials. When
polyvinyl chloride is carbonized, the carbon yield is 20 to 3011, and the characteristics after
carbonization are Young's modulus 5 ooo to 4000 // and mechanical sf is also low. By making
polyvinyl chloride into a pitch shape, the carbon efficiency improves to around 80-by VC. し か
し However, when pva pitch is formed alone into the shape of the diaphragm and carbonized, the
shape of the diaphragm is maintained and carbonized It is difficult to do. In addition, if tension is
not applied during carbonization, the orientation does not increase, and a highly elastic carbon
material is obtained, h. Therefore, when pva pitch is used alone, it tends to be deformed when it
is shaped and carbonized into the shape of the diaphragm, so it is necessary to add a solid
integral powder and the most preferable among solid powders. Is a graphite powder.
Thus, in the molding material in which the graphite powder is added to the pvO pitch, (1) the
kernel which can prevent the shrinkage and deformation occurring at the time of pre-sintering
and carbonization by adding the graphite powder, and (2) PvC pitch and graphite powder In
forming the mixed wire t-tough plate, the graphite powder is oriented, and the modulus of
elasticity and mechanical strength can be altered, and (3) the graphite powder becomes a crystal
nucleus during carbonization, and a crystal is formed. Good-carbon can be obtained, and effects
such as the ability to greatly improve the elastic modulus after carbonization and the mechanical
strength can be expected. Generally, materials added during carbonization include carbon
materials such as carbon black and carbon fiber, but since carbon black has poor crystallinity, it
has six defects that can not be a good crystal nucleus VC, and carbon Fiber, graphitized or
desirable, if it can be cut to a length of several μm or less, it may become a good crystal nucleus,
but cutting fr of several μ or less is difficult and if it can be done It is very expensive and is not
practical. The inventive molding material is described below. According to the molding material
of the present invention, first, PvC pitch is obtained by heating to about 40011 in a non-oxidizing
atmosphere such as pvct nitrogen or argon gas. 50 pmf) Graphite powder (@ flake graphite) is
added and mixed, and it is obtained by kneading with a kneader or a roller while heating to 20.0
to 300 ° C. The pitch can be obtained by simply heating pvatt. In addition, as another method of
obtaining pitch-like PvC, it is also possible to use a plasticizer and a solvent for pva. In order to
facilitate the mixing of 0 graphite powder, it is possible to use PvC pitch at normal temperature
by using cutting. In a liquid form with suitable viscosity, and mix without heating. However, since
this method ttSEndPage: shrinks when the two agents evaporate, it is necessary to be aware of
that amount. The addition i of the graphite powder is in the range of 10 to sowt, but good results
can be obtained with 40 to yowt *. Although the particle size of the graphite powder varies
depending on the size and shape of the diaphragm to be formed, the smaller the particle size is,
the better. Generally, the particle size is preferably <0.1 to several μm (preferably 5 μm or less
in average particle size). A method of manufacturing a diaphragm will be described below using
the molding material obtained in this way. Molding step Molding material 'fti The diaphragm is
molded into a desired shape, for example, a dome shape, a cone shape, etc. The thickness of one
molded product to be molded varies depending on the size and shape of the vibrating plate-When
the molding material is mixed and obtained while being heated (mixing #) A press die that has
been formed into a desired shape and size that should become an oscillating plate is heated to
200 to 5 ocs degrees and press molded.
When the molding material is obtained by mixing (kneading) using a filler, it is press-molded at
room temperature, sufficiently dried, and the solvent is removed. Heat the molded product in air
(in a #R converting atmosphere) at 250 to 300 ° C. vcir for at least 51! The surface oxidation of
the form is performed to make it infusible so as not to cause deformation during the next step,
carbonization. The infusibilization may be carried out at a temperature of about 50 to 80 ° C. in
ozone for 4 to 8 hours and then at the above-mentioned temperature in air. 8-Also in the
infusibilization process, the molded product may be deformed by heating, so either a wire mesh
or a punched gold kA thin plate is placed on a jig formed in the shape of a diaphragm, or held
and processed. May be Furthermore, good results can be obtained if the heating time is 10 hours
or more. Carbonization process The molded product that has undergone the pre-baking process
is carbonized by heating to 1000 to 1500 ° C. in a non-oxidizing atmosphere such as nitrogen
or argon gas ◎ The carbonization process may delay the initial temperature increase. is
necessary. That is, it is preferable to carry out by 1 to b up to 400 C, and 10 to b uplifting prize
at S or 400 ° C. or more. Carbides with good characteristics can be obtained with a small, fast
heating rate. This is because if the initial temperature raising rate is increased, the carbon
material becomes rough and the Young's modulus and mechanical strength both decrease, and if
it is 40011 or more, it is performed at an appropriately high speed in consideration of economy.
It is desirable to carry out carbonization by placing or holding it on a jig made of carbon or high
melting point metal or the like and formed in the shape of a diaphragm, since the molded
product is deformed during carbonization. The carbonized molded product is used as the it's
vibration plate, or is further subjected to desired processing (such as removal of a pill, removal of
a hole, etc.) to complete a diaphragm.
Molding material
The following is a detailed description of the present invention. Example 1 Particles ls number
pmOMmk 50 * tfi Addition, PVOt'y 2 is kneaded while heating to 250 ° C. to obtain a molding
material EndPage: 3. In order to form a diaphragm using this material, the dome is first pressed
at 250 ° C. into a shape, the molding is oxidized in air at 300 ° C. for 20 hours, and then 300
° in a nitrogen gas atmosphere. A sliding plate for a speaker carbonized by heating between C
and 500 ° C at a heating rate of 3 ° C / hour, and heating between 500 ° C and 1250 ° Cd at
a heating rate of 20 ° C / hour. I got The Young's modulus of the diaphragm thus obtained was
16000 if / rd, and the density was 1.6 f / d. A comparison of a diaphragm made of the molding
material of the present invention with a diaphragm made of another material is shown in the
table below. As shown in the table, a diaphragm using a molding material mixed with the PvC
pitch graphite powder of the present invention has / ρ at a specific elastic modulus of about 5
times that of aluminum neem and is slightly inferior to beryllium. It is an extent. The internal loss
of the diaphragm obtained by the material of the present invention is about 10 times larger than
that of beryllium, and its frequency characteristics are as shown in FIG. 2. The beryllium
diaphragm of the same shape shown by the dotted line is higher than the high frequency
resonance. The frequency Vill is almost the same, and the characteristic light is flat, and the
frequency characteristic of the high range becomes good and becomes very excellent.
Hereinafter, as described above, in the case of a molding material VC obtained by mixing pvc
pitch and graphite powder, if it is formed and then carbonized to form a diaphragm, the specific
elastic modulus is large and the internal loss is also large. In addition, it is possible to
manufacture an inexpensive diaphragm.
4. Brief description of the drawings. FIG. 1 is a process diagram for explaining a method of
manufacturing a diaphragm with the molding material of the present invention, and FIG. 2 is a
comparison showing the frequency characteristics of the diaphragm and the beryllium
diaphragm according to the material of the present invention. FIG. . Patent Assignee Pioneer
Corporation 3 frequency-dispute End Page: 4 Continued on Page 1 0 Inventor Araihara 2 Tokyo
Metropolitan Ota Ward Omori Ward 4-15-5 No. 5 Pioneer Corporation Omori Factory EndPage:
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