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Description 1, title of the invention
Molding material
DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a molding
material obtained by mixing and thoroughly kneading tetrabenzophenazine (hereinafter referred
to as Px) pitch and graphite powder (scale-like graphite). In general, the diaphragms for audio
equipment, in particular thin □ plates of molding materials used as molded in the diaphragms of
speakers, are light in weight and large in rigidity in order to reproduce efficiently and faithfully
over a wide frequency band. It is required that the specific blade / ρ between the Young's
modulus 冨 and the density ρ be large. Conventionally, wood pulp, synthetic resin, aluminum,
titanium and the like have been used from these points, but it has been difficult to say that all of
them have sufficient custom-made. Also, an example using a carbon-based material is a
composite material of carbon fiber and synthesis 1, but due to the lubricity of the surface
possessed by carbon fiber itself, bonding of carbon fiber by synthetic tree 11 NK is sufficient.
Also, due to the large anisotropy of carbon fiber, thick and 'rigidity' can be obtained as a KII like a
diaphragm. Therefore, the inventor paid attention to carbon as a material which is light in weight,
large in rigidity, and has a large specific blade / rho of high Young's modulus 罵 and dense Lp,
and previously proposed a diaphragm in which a synthetic resin is carbonized or blackened.
However, the carbonization process of the synthetic resin or the graphite (in the form of
shrinkage of the material at the end of the surface of the material) is not good. In the present
invention, in view of such a point □, its purpose FiJ ′ after being carbonized or graphitized after
carbonization or graphitization to obtain a sound board for sound 1 ′ ′, its rigidity is large at
鎗, and its strength is low. The ratio and the ratio E / 率 of the rate of ¥ j1 can be large and form
a vibration 塾 for acoustic equipment! In addition, it is possible to cause deformation of the
material in one pot to carbonize or graphitize, provide AVc, form material. That is, the present
invention provides a molding material obtained by kneading P-type with pitch-like KL and
graphite powder. As materials used for carbonization, vinyl chloride cp-vc>, 7? ,! There are J-leni-le (PAN), petroleum pitch, coal tar, furan resin, lignin popanil, etc. These materials should be
added with extra-gallium during carbonization to obtain a well-oriented carbon film if not tensed.
I can not do it. pg pitch is carbonized under tension l <Even high-angle ball with easy orientation
t! Because # is obtained, it is the most suitable as a carbon material source for vibration cages.
Also, in particular, Pg is heated in a non-oxidizing atmosphere and pitch-based (volatilized by
heating). It is possible to remove the components and low molecular weight components and to
improve the final carbon yield by a considerable amount (about 95)), thus greatly improving the
elastic modulus and mechanical strength of the carbonized material. it can.
However, the above-mentioned PvC% P pm N1 petroleum pitch and the like generally used for
carbonization are also heated to 3001 :: grade in an oxidizing atmosphere (this operation is
referred to as pre-baking), even at high temperatures during carbonization -1. Although it can be
carbonized keeping the shape of the -3 rc diaphragm, Pg pitch can not be completely infused by
pre-baking, and it is difficult to carbonize by maintaining the shape of the diaphragm with Pg
pitch alone. Therefore, when Pz pitch is used as a ring, deformation is likely to occur when the
shape, vcy shape of the diaphragm is carbonized, and therefore it is necessary to add the same
powder. The most preferable solid powder is graphite powder, and addition of the graphite
powder (1) ′ can prevent shrinkage, deformation, and shape caused at the time of pre-baking
and carbonization, (2) diaphragm Q 'When forming into a shape, the graphite powder is oriented,
and the elastic modulus and mechanical strength can be improved, and the graphite powder
becomes a crystal nucleus at the time of carbonization, and carbon having good crystallinity can
be obtained. And, it is possible to expect young fruits such as elastic modulus after carbonization
and mechanical strength to be greatly improved. Generally, materials added during carbonization
include carbon materials such as carbon black and carbon / fibre fibers, but since carbon black
has poor crystallinity, it has a defect that it can not be a good crystal nucleus, and carbon Fiber is
desired to be graphitized, and it may be a good crystal nucleus if it is cut into lengths of several
μm or less, but it may become a good crystal nucleus, but cutting of several μm or less may be
both difficult and necessary. Even if it is very expensive, it is not practical. The molding material
of the present invention will be described below. First, in order to obtain -Pg pitch, Pg is heated
in a non-oxidizing atmosphere such as nitrogen or argon gas to obtain a pitch-like substance.
Simply Pg 5. The pitch can be obtained by heating to LO ~ 580 ° C. It is also possible to use If,
Pglc, OT plastic, solvent as another method of obtaining Pzt-like pitch. To warm the graphite
powder to Pg pitch with and to obtain a molding material EndPage: 2, add graphite powder (M
flake graphite) with a weft diameter of 0.1 to 50 μm to Pz pitch and mix 1,2. It knead | mixes
with a kneader or a roller, heating at 00-300 degreeC. YC, which facilitates mixing, uses a solvent
to make Pz pitch a liquid having a suitable viscosity at normal temperature, and is mixed without
heating. However, this method must be kept in mind as it shrinks as the solvent evaporates. In
addition, although the addition amount of the graphite powder is in the range of 10 to 10 wt%,
good results can be obtained with 40 to 70 wt%, and the particle size of the graphite powder
varies depending on the size and shape of the glazing plate. Generally, the smaller the better, the
smaller the better, and the smaller the range from 0.1 to 0 [mu] m.
・・。 Next, a method for obtaining a diaphragm using this molding material is described. ,
Molding process. The above molding material is first formed into a desired shape of the
diaphragm, for example, a dome shape, a cone shape, etc. b The thickness of the molding to be a
diaphragm to be molded is J-heating which differs depending on the size of the diaphragm and
the shape. Molding of the molding material obtained by mixing (blending) is carried out by
heating the press mold which is a desired shape and size VC to be a diaphragm to about 200 to
400 ° C. and pressing it . In the case of molding of a molding material obtained by mixing
(blending) using a solvent, it is press-molded at room temperature, Kd at room temperature, and
sufficiently dried to obtain a glaze, and it is obtained in 0 pre-baking step molding step Moldings
in air (oxidative atmosphere). Heat at 3.0 to 450 ° C. in an atmosphere) to at least oxidize the
surface of the molded product, and make it infusible so that 1 c deformation does not occur
during carbonization which is the next step. The oxidation may be performed at a temperature of
70 ° C. with ozone φ, and then the above-described temperature may be performed with -iGzrc
air Φ. Also, in the pre-baking process, the molded product may be deformed by heating, so is it a
wire mesh or a punched sheet metal diaphragm? Molded VC molded into a jig. ・′7.。 It may
be placed or held in place. Good results can be obtained if the heating time is 10 hours or more,
and in order to improve the-, 5f baking, the molding is carried out at 50 to 80 ° C. in ozone and
then the above treatment in air It is desirable to do The molded product obtained through the
carbonization step and the pre-baking step is carbonized by heating to 1000 ° C. (10 ° C.) in a
non-oxidizing atmosphere such as nitrogen or anabone gas. It is necessary to slow the initial
heating rate in this carbonization step. That is, at a heating rate of 20 U / hour for 1 to 500 p / h,
between & 500 ° C. 1Qt-tlO to 10 Q ° C./%), the heating rate 't' ザ is desirable. Even if the
external temperature rate is 4s, a well-characterized carbide can be obtained. Even if the initial
heating rate is increased, the rough carbon material of the structure and the P Young's modulus
both decrease with mechanical strength. And, at 50,0 ° C. or higher, it is carried out at an
appropriately high speed in consideration of economy. In addition, it is desirable that
carbonization 0EndPage: 3 be performed by adding or removing a molded material made of
carbon or a high melting point metal or the like and formed into a shape of a diaphragm because
the molded product is deformed during carbonization.炭化 The carbonized molded product is
used as a diaphragm as it is or is further subjected to desired pre-processing (such as removal of
paris, holes and so on) to complete as a diaphragm.
Molding material
Hereinafter, the present invention will be described in detail. Example Graphite with particle
diameter of several μm is added by SO 2 and kneaded while heating with Pill pitch and sooc K to
obtain a molding material O To obtain a diaphragm with this molding material, the molding
material is first shaped like a dome Press molded at 300 t and oxidize the molding in air at 320
° C. for 20 hours, then in a nitrogen gas atmosphere at a heating rate of 3 ° C./hour between
300 and 500 ′ ′. A speaker diaphragm is obtained which is heated and carbonized by heating
at a temperature rising rate of 20 ° C./hour from 's'oo ° C. to 12 SOCfi to obtain a 90 °
Young's modulus of this diaphragm is 2 g 100 to 0-/-1 dense Anxiety is 1. Tf/edであった。
The diaphragm made of the molding material of the present invention and the other material
table (The diaphragm using the kneading and molding material of Pg pitch and the graphite
powder i has a ratio of 5.1 times Al Beryllium and red 1 are equivalent with elastic weight / p.
Also, the diaphragm obtained by the molding material of the present invention has an internal
loss KTh larger than that of beryllium by one digit, and its frequency characteristics are as shown
in FIG. 2. The beryllium diaphragm of the same shape shown by the dotted line is relatively high.
The frequency characteristics of the sound range become excellent and become extremely
excellent. As described above, in the molding material obtained by mixing Pg pitch and the
graphite powder, the specific elastic modulus is large, and the internal loss is Can also be
manufactured inexpensively in a simple process.
BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a process diagram for explaining a method of
manufacturing a diaphragm with the molding material according to the present invention, the
second mFi the frequency characteristics of the diaphragm formed with the molding material
according to the present invention and the beryllium diaphragm It is a comparison figure. Patent
Assignee Pioneer Corporation Frequency-Competition End Page: 4 Continued on page 1 0
Inventor Araihara 2 Tokyo Metropolitan Ota-ku Omori Ward 4-15 No. 5 Pioneer Corporation
Omori Factory # # "Akira 55-40760 (5 ) EndPage: 5
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