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DESCRIPTION JPH07233278

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DESCRIPTION JPH07233278
[0001]
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a
tungsten-containing resin molded product and a method for producing the same, and more
particularly, it is unnecessary to use, for example, measurement equipment, ultrasound
equipment, movie equipment and medical equipment using ultrasonic waves. The present
invention relates to a tungsten-containing resin molded product used to absorb ultrasonic waves
or noise and a method of manufacturing the same.
[0002]
2. Description of the Related Art Conventionally, in measuring instruments, movie instruments,
medical instruments and the like using ultrasonic waves as described above, metal powders of
high specific gravity are resinized to absorb unnecessary ultrasonic waves or noise. A metal
powder-containing resin molded product molded by the above method has been used. For
example, as a sound insulation material for removing screw noise in a detection apparatus for
measuring the shape of a seabed or a fish school in a measuring instrument, an ultrasonic delay
element used in an imaging device such as a video camera in a motion picture device Such metal
powder-containing resin molded articles are used as an absorbent material that is disposed to
absorb unwanted signals, and in medical instruments and devices for ultrasonic probes used in
medical ultrasonic diagnostic equipment. is there.
[0003]
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As described above, since metal powder-containing resin molded products are used in a wide
range of fields, firstly, low electric conductivity, and secondly, uniformity with no bias in
materials and voids, It is required that there is no so-called "nest".
[0004]
The metal powder-containing resin molded product is mainly in a solution of a liquid
thermosetting resin such as an epoxy resin, if it is described as an example that is known as an
ultrasonic absorber of a medical ultrasonic probe. It is manufactured by mixing a metal powder
of high specific gravity, such as tungsten powder, and further mixing and hardening a suitable
filler material, an acoustic scattering material, etc.
[0005]
By the way, as described above, when a metal powder or the like is mixed in a resin solution and
cured to produce a resin molded product, the obtained metal powder-containing resin molded
product is uniform. In order to achieve this, it is important that metal powder etc. be uniformly
mixed in the resin solution, but metal powder in particular has high specific gravity such as
tungsten powder, so this component and resin solution It is difficult to produce a uniform metal
powder-containing resin molded product because the specific gravity difference becomes
extremely large.
[0006]
Also, depending on the application, it may be required that the metal powder-containing resin
molded product has a high specific gravity, for example, a specific gravity of 7 or more, but if it is
intended to mix the metal powder as uniformly as possible in the resin solution, the metal
powder In the above-mentioned conventional manufacturing method using a liquid resin, it is
extremely difficult to manufacture a metal powder-containing resin molded product having a
high specific gravity.
[0007]
On the other hand, epoxy resin and metal powder are mixed, and in some cases, metal oxide
powder, plastic hollow body or glass hollow body is added and hardened (JP-A-54-155028 and
JP-B-3-47800) Reference is also proposed, but in the case of using an epoxy resin, since bubbles
always occur during the mixing process, a defoaming process is required, and there is a
disadvantage that the manufacturing process becomes complicated.
[0008]
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The present invention solves the problems of the prior art as described above, forms a uniform
mixture of metal powder and resin by tungsten, and further has a tungsten-containing resin
molded product having an arbitrary specific gravity, and a simple manufacturing method thereof.
It was made to provide, in particular, to meet the demand for uniform and high specific gravity
tungsten-containing resin moldings.
[0009]
SUMMARY OF THE INVENTION In order to achieve the above object, the structure of a tungstencontaining resin molding adopted by the present invention is to mold a powdery composition
obtained mainly from tungsten and a thermosetting resin. The composition of the production
method is characterized in that a powdery composition is obtained mainly from tungsten and a
thermosetting resin, and the powdery composition is molded. It is
[0010]
The present invention will be described in detail below.
[0011]
In the present invention, tungsten is used as the metal of high specific gravity which is also used
in the conventionally known metal powder-containing resin molded product.
Of course, powdery tungsten is used as this tungsten.
[0012]
The resin used as a binder in the present invention is a thermosetting resin, and specifically, a
phenolic resin, an SRB modified phenolic resin, an acrylic rubber modified phenolic resin, a
cashew modified phenolic resin, an aralkyl modified resin such as Zilok (trade name), etc. One or
more selected from modified phenolic resins such as phenolic resin etc., melamine resins or urea
resins, or modified resins such as SRB modified resins thereof can be mentioned, and all should
be solid powders. desirable.
[0013]
In the present invention, in addition to the above-mentioned essential components, if necessary,
fiber components and filler components for reinforcing the obtained resin molded product may
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be contained, and as this fiber component, aramid fibers, cellulose fibers, etc. Or one or more
selected from inorganic fibers such as glass fibers, rock wool and ceramic fibers.
[0014]
Moreover, as the filler component, one or more selected from coke, barium sulfate powder,
calcium carbonate powder and the like can be exemplified, and among these, coke is effective for
suppressing the flow of resin. Barium sulfate powder and calcium carbonate powder are useful as
regulators of specific gravity.
[0015]
Thus, the tungsten-containing resin molded product of the present invention can be produced by
the production method of the present invention described below, using the components as
described above.
That is, first, a powdery composition is produced from tungsten and a thermosetting resin, and a
fiber component and a filler which are optionally added.
This powdery composition can be conveniently prepared by mixing the above-mentioned
components with a mixer such as Henschel, Loedige, Eirich or the like.
The thermosetting resin is preferably in the form of a solid powder, and the mixing is preferably
performed by the so-called dry mix method, but the present invention is not limited in this way,
and in the powdery composition obtained Tungsten, a thermosetting resin, and other
components added as needed may be mixed uniformly or substantially uniformly as a result.
[0016]
Then, the powdery composition produced as described above is preformed.
In this preforming, for example, the powdery composition 3 is put between a molding male mold
1 and a female mold 2 as shown in FIG. 1, and a temperature of room temperature to 60 ° C.
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and a pressure of 20 to 100 kg / cm 2. You can do it.
In addition, this pre-forming can also be omitted.
[0017]
Then, the preform manufactured as described above is placed in a mold similar to that shown in
FIG. 1, and the temperature of 120 ° C. to 200 ° C., the pressure of 100 to 500 kg / cm 2 for 1
minute to 20 minutes Do the molding.
Note that air may be removed during molding if necessary.
[0018]
In the present invention, the powdery composition produced as described above may be molded
at a temperature of room temperature to 200 ° C. and a pressure of 20 to 500 kg / cm 2
without preforming. Even if the heat treatment is performed or not, after press-molding at room
temperature, it may be put into a suitable mold in order to prevent expansion of the molded
product, and may be heat-molded without pressure.
[0019]
In addition, if necessary, the obtained molded product is further subjected to heat treatment, and
in particular, the uncured resin which may remain when pressure-molded at room temperature is
reacted and cured to increase the strength of the molded product. The heat treatment conditions
in this case can be exemplified by the conditions of heat treatment at a temperature of 120 ° C.
to 400 ° C. for 30 minutes to 20 hours.
[0020]
Finally, the molded product obtained as described above or the heat-treated molded product is
subjected to processing such as polishing to finish as a tungsten-containing resin molded
product.
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This final tungsten-containing resin molded product can be made into a desired shape by
appropriately selecting the above-mentioned mold, but a plate-shaped molded product 4 as
shown in FIG. 2 or as shown in FIG. 3 The molded product 5 in a shape obtained by cutting a part
of a cylinder or the disk-shaped molded product 6 as shown in FIG. 4 can be mentioned as an
example.
[0021]
The obtained tungsten-containing resin molded product of the present invention is a preferable
one wherein the whole constitutes a uniform mixture and has an arbitrary specific gravity, for
example, a specific gravity of 7 or more.
[0022]
The present invention will be described in more detail by way of the following examples.
[0023]
Examples 1 to 5 First, tungsten powder, non-modified phenolic resin, rubber-modified phenolic
resin, aramid fiber as a fiber component, calcium carbonate as a filler component are uniformly
mixed according to the composition shown in Table 1, and powder Like composition was
obtained.
Next, after preforming at room temperature under a pressure of 40 kg / cm 2, pressure molding
was performed for 10 minutes under a temperature of 160 ° C. and a pressure of 150 kg / cm 2
(premolding and pressure heating molding are performed using the apparatus shown in FIG.
Carried out), a tungsten-containing resin molded product was obtained.
The specific gravity of the obtained tungsten-containing resin molded product is shown in Table
1.
The specific gravity of the resin molded product containing no tungsten was 1.9.
[0024]
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EXAMPLE 6 A tungsten-containing resin molded product was obtained in the same manner as in
Example 2 except that rock wool was used instead of the aramid fibers in the composition of
Example 2.
The composition and specific gravity of the obtained tungsten-containing resin molded product
are shown in Table 2.
[0025]
Examples 7 to 9 The amount of aramid fibers in the composition of Example 2 is reduced and
changed to barium sulfate (Example 7), calcium carbonate (Example 8), coke (Example 9), etc.
Thus, a tungsten-containing resin molded product was obtained.
The composition and specific gravity of the obtained tungsten-containing resin molded product
are shown in Table 2.
[0026]
Examples 10 and 11 Tungsten-containing resin molded articles were obtained in the same
manner as in Example 2 except that melamine resin and urea resin were used instead of the
phenol resin in the composition of Example 2, respectively.
The composition and specific gravity of the obtained tungsten-containing resin molded product
are shown in Table 2.
[0027]
Comparative Examples 1 to 4 First, tungsten powder and aramid fibers were uniformly mixed, a
liquid epoxy resin was added and mixed, and the obtained mixture was poured into a mold and
then defoamed.
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While stirring the mixture, an appropriate amount of a curing agent was added, defoaming was
further performed, and the mixture was allowed to stand for about 10 hours to obtain a
tungsten-containing resin molded product of a comparative example. Table 3 shows the
composition, specific gravity and uniformity of the obtained tungsten-containing resin molded
product.
[0028]
According to the present invention, instead of mixing metal powder and liquid resin as in the
prior art, a powdery composition is preferably obtained by dry mixing using a solid powdery
thermosetting resin or the like. Since the powdery composition is molded, the uniformity is
significantly improved as compared with the conventional one, and a tungsten-containing resin
molded product having a desired specific gravity, for example, a specific gravity of 2 to 9.5 can
be obtained. Moreover, since the present invention obtains a tungsten-containing resin molded
product by molding the above powdery composition, a defoaming step is unnecessary, and the
manufacturing method and apparatus are extremely simple. For example, in an ultrasonic probe,
there is a structure in which an acoustic matching layer is disposed on one of the electrodes and
an ultrasonic absorbing material on the other, and these acoustic matching layers and ultrasonic
absorbing materials are constructed. Although materials having different acoustic impedances
(represented by the product of sound velocity and density) are used as the materials, as
described above, the tungsten-containing resin molded product of the present invention has a
desired specific gravity, for example, specific gravity 2-9. Since it can be adjusted to 5, it is
possible to easily apply different acoustic impedances to required members, such as an acoustic
matching layer and an ultrasonic absorber.
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