JP3472464B2 - Composite of resin and filler and method for producing the same - Google Patents

Description

Detailed Description of the Invention

[0001]

TECHNICAL FIELD The present invention is applicable to all kinds of electronic parts, structural parts, mechanical parts, mechanical parts, automobile parts, OA equipment parts, functional (conductive, magnetic, dielectric) parts, sliding parts, etc. TECHNICAL FIELD The present invention relates to a composite of a resin and a filler used for a purpose and a method for producing the same.

[0002]

2. Description of the Related Art Injection molding, heat and pressure molding and the like are used to manufacture parts having a predetermined shape from thermosetting resins such as epoxy resin and phenol resin. Of these, the injection molding method is a method of injecting a resin slurry into a mold having a predetermined shape and heating and curing, and is the most general resin molding method.

Further, by adding and mixing an inorganic powder called a filler to the above resin, a composite of the resin and the filler having a hardness and strength higher than that of the resin alone is also obtained (JP-A-57-57). No. 151308). This composite of resin and filler is also generally manufactured by an injection molding method or a heat and pressure molding method, as in the case of the above-mentioned resin alone.

[0004]

However, since the composites of the resin and the filler obtained by the injection molding method or the heat and pressure molding method are both heat-cured in the mold, the metal at the time of curing is The mold will be heated. Therefore, it is difficult to increase the dimensional accuracy of the composite of the resin and the filler due to the thermal deformation of the mold.

Moreover, the mold used in the above manufacturing method is
A special mold is required, for example, it is necessary to use a material that is less likely to be thermally deformed and to have a shape having a gate of a molten material and a slag gate. Therefore, there is a problem that it takes time and effort to manufacture a large number of products in small quantities, resulting in an increase in manufacturing cost.

Further, in the above-mentioned manufacturing method, since the heat curing is performed simultaneously with molding in one cycle in the mold, the molding tact time is long and it is difficult to shorten the time required for manufacturing.

Further, in the case of injection molding of thermosetting resin, the resin in the liner portion of the path for injecting the molten resin into the mold cannot be reused or regenerated, and therefore was discarded. Therefore, in the case of a molded product having a relatively small size, the ratio of waste raw materials becomes high, and the raw material cost in the product unit price becomes high. Therefore, it is difficult to reduce the product unit price.

Further, in the case of the most general injection molding method, on the surface of the obtained molded body, minute irregularities generated by the injection molding method, that is, weld lines of concave streaks and convex shapes generated in the mold divided portion are formed. Streaks and burrs, knockout pin dents that occur when the product is taken out of the mold,
A gate portion is formed at the resin injection port, and such a minute uneven portion causes a poor appearance and causes a reduction in yield.

Further, since the surface of the molded body molded by the conventional injection molding method and the heating and pressure molding method is transferred to the mold, the surface condition is smooth, so that the adhesive strength after soldering is high. It was necessary to improve the quality and prevent the peeling during printing of characters on the surface.

Further, it is difficult to evenly distribute the pores inside the molded body by the injection molding method and the heat and pressure molding method.

That is, curing of the thermosetting resin is initiated by a chemical reaction with the curing agent. For example, when the thermosetting resin is a phenol novolac resin, hexamethylenetetramine is used as a curing agent, and hexamethylenetetramine is decomposed by heating to produce an aldehyde, and this aldehyde attacks the hydroxyl group of phenol to lead to crosslinking. The reaction causes a polymerization and curing reaction, but when the hexamethylenetetramine is decomposed, gases such as carbon dioxide, ammonia, and steam are generated in addition to the aldehyde.
Then, in the injection molding method, when these gases are generated, the pressure is not transmitted, resulting in poor molding. Therefore, treatment such as degassing is usually performed, and pores are formed inside and outside the composite of resin and filler. It was hardly seen.

However, when such a resin-filler composite without pores is used as a sliding member,
Since the thermal conductivity of the thermosetting resin existing on the sliding surface is not so high, there is a problem that it is greatly worn by frictional heat accompanying sliding with the mating member.

For example, when it is used as a sliding member, it is necessary to apply a lubricant or the like to the sliding surface in order to improve durability, and it is necessary to replenish it during use.

On the other hand, in the conventional injection molding method and the manufacturing method by the pressure heating molding method, the compounding amount of the filler is 20 to 30.
There was a limit to increase the volume to about%. That is, if a large amount of filler is blended, the viscosity of the molten resin becomes high,
Flowability will decrease. As a result, the formability is deteriorated, and defects such as a decrease in dimensional accuracy, cracks, and warpage occur.

Therefore, there is a limit to the amount of filler that can be added,
When injection molding or heat and pressure molding is used, heat resistance and tracking resistance cannot be further improved, so applications requiring high heat resistance and high tracking resistance,
For example, the range of use was limited for safety equipment parts and the like.

[0016]

Therefore, the present invention provides 10-
70% by volume of thermosetting resin and the balance of the average particle size is 40 μm
A composite of a resin and a filler comprising the following fillers, characterized in that the dimensional accuracy with respect to the center standard value is within ± 2.0%.

The dimensional accuracy with respect to the center standard value within ± 2.0% means that either of the following two cases is satisfied.

First, when the preset mold dimension is set as a center standard value and the ratio of the difference in the dimension of the final product to this center standard value is set as the dimensional accuracy, this dimensional accuracy is within ± 2.0%. It should be.

Or, when the product is obtained from the final product only,
When the average value when measuring the dimensions of the same place for five or more final products of the same shape is the central standard value, and the ratio of the difference of each measured value to this central standard value is the dimensional accuracy,
It is sufficient if this dimensional accuracy is within a range of ± 2.0%.

Further, in the present invention, a thermosetting resin powder such as phenol or epoxy resin is mixed with a filler having an average particle size of 40 μm or less, and the raw material powder is pressure-molded at a room temperature into a predetermined shape, It is characterized in that a composite of a resin and a filler is produced from a step of releasing and heating and curing.

That is, according to the present invention, a mixed raw material of a thermosetting resin and a filler is pressure-molded at room temperature to
Molding can be performed with high dimensional accuracy without deformation of the mold during molding.
Therefore, as described above, it is possible to obtain a product with high dimensional accuracy such that the dimensional accuracy is within ± 2.0%.

Further, since pressure molding is performed at room temperature, the mold can be easily manufactured at low cost without requiring a special material or shape.

Further, the molded body thus obtained is released from the mold and is heat-cured, so that this heat-curing step can be extremely efficiently manufactured by using a continuous furnace.

The amount of the thermosetting resin in the resin-filler composite of the present invention is set to 10 to 70% by volume when the amount is less than 10% by volume. Is weak and not practical, while 70% by volume
This is because if the temperature exceeds the above range, the resin is melted during heat curing to cause deformation and the above dimensional accuracy cannot be obtained. More preferably, the compounding ratio of the resin is in the range of 10 to 40% by volume. As the resin used in the composite of the resin of the present invention and the filler, thermosetting resins such as epoxy resins, phenol resins, melanin resins, and polyester resins can be used in general.

Further, by using the resin composite material and the manufacturing process of the present invention, minute irregularities on the surface generated by the injection molding and pressure heating molding methods, that is, concave streaks called weld lines and mold dividing portions. Convex streaks, burrs,
It is possible to obtain a good surface without producing dents on the knockout pin when the product is taken out of the mold, or a gate portion or the like generated at the resin injection port.

Further, in the case of powder pressure molding of the resin composite powder of the present invention, a good compact can be obtained by making the powder into a granule state so that the powder pressure molding is possible. By molding using such granules, the structure of the obtained resin-filler composite is in a state in which the filler is scattered around the particulate resin portion.

As shown in FIG. 1, a specific example is shown in which 10 to 70% by volume of a thermosetting resin forms a particulate resin portion 31 around which a filler 32 having an average particle diameter of 40 μm or less is distributed. It is a structure that exists. This can be easily observed with a metallographic microscope or an electron microscope (SEM).

By using the above manufacturing method, the pores 33 as shown in FIG. 1 can be uniformly distributed inside the composite of the resin and the filler. That is, since gas is generated when the above-mentioned resin is heated and cured, the pores 33 can be easily obtained by confining the inside of the resin as it is without degassing.

When this composite of resin and filler is used for the sliding member, the average diameter of the pores 33 is preferably in the range of 15 to 80 μm, and the occupied area ratio thereof may be in the range of 3 to 30%. This is because if the average diameter of the pores is less than 15 μm, the heat dissipation becomes poor, frictional heat increases, the resin component present on the sliding surface undergoes cohesive wear, and the resin portion carbonizes due to frictional heat. This is because the strength is deteriorated and the mating sliding member is worn. On the other hand, when the average diameter of the pores is larger than 80 μm, the appearance after heat-curing causes a problem such as swelling, the desired dimensional accuracy cannot be maintained, and the bending strength is greatly reduced.

When the occupied area ratio of pores is less than 3%,
This is because the effect of enhancing the heat dissipation property is small and the effect of enhancing the sliding property is also small, and when it exceeds 30%, the transverse strength decreases to 80 MPa or less and cannot be used as a sliding member.

As the filler to be added to the above resin, powders or fibers of an inorganic material or an organic material can be used. Specific examples of the inorganic material include simple metals, glass or metal oxides, carbides, and nitrides. A substance or the like or a complex compound thereof is used. For example, Au, Ag, Cu, Ni, Al, Fe or the like is used as the metal simple substance, and Al ₂ O ₃ , SiO ₂ , GF (glass fiber), CF (carbon fiber), ferrite, calcium carbonate, carbonic acid as the metal compound. Barium, mica, etc. are used. As the organic material, resin fiber or resin powder can be used.

The filler has an average particle size of 40 μm.
The reason is as follows. This is because when the average particle diameter exceeds 40 μm, the surface of the molded body becomes rough and the appearance or surface characteristics deteriorate, so that it cannot be practically used.

The volume ratio of the thermosetting resin to the filler, and the average particle size of the filler are determined by using a metal microscope or an electron microscope (S) to measure an arbitrary surface or cross section of the resin-filler composite.
It is enlarged by EM) and analyzed by an image analyzer to measure. That is, on any surface or cross section of the composite of resin and filler, the resin portion and the filler portion are distinguished by an image analyzer, and the ratio of the area of the resin portion to the measured total area is the volume ratio of the resin, the area of the filler portion. Is the volume ratio of the filler.

Further, the average value of the particle diameters of the fillers present in the entire measured area is calculated, and this is set as the average particle diameter of the fillers. When the filler is fibrous or acicular particles, its major axis is calculated as the particle diameter.

In the composite of the resin of the present invention and the filler, Cl, P, Na, Al, Si, and
Sr, Mg, Zr, Fe, Co, Cu, Ta, etc. may be contained, and there is no problem in characteristics even if these are mixed in an amount of about 0.1% by weight. Further, other metal elements may be mixed in an extremely small amount due to the manufacturing process.

Next, in the method for producing a composite of a resin and a filler of the present invention, first, the resin and the filler are mixed so that the above volume ratio and average particle diameter are obtained, and the obtained raw material is pressure-molded at room temperature. . This step is similar to a general powder pressure molding method, in which the raw material powder is filled in the space formed by the die and the upper and lower punches, and pressed by the upper and lower punches. At this time, as the material of the die and the die such as the upper and lower punches, a general cemented carbide may be used, and no special material is required. Moreover, it is only necessary to prepare a mold having the same shape as the final product, and it is not necessary to make it a complicated shape.

Further, at this time, by using a multi-stage press, a pin or the like, it is possible to easily carry out pressure molding for a shape having a step portion or a through hole.

By performing this pressure molding at room temperature, it is possible to eliminate the thermal deformation of the mold and mold it with high dimensional accuracy. In addition, since the molded product obtained by pressure molding can be released from the mold one after another, the molding work can be performed extremely efficiently, and minute irregularities such as weld marks like injection molding occur. It is possible to obtain a molded product having the same shape as the final product.

After that, when the obtained molded product is heat-cured, a large amount of products can be easily treated in a short time by heat-curing at 100 to 250 ° C. in a continuous furnace or the like. Regarding the conditions such as temperature and time during heat curing, it is necessary to set the conditions such that the resin is sufficiently heat cured and the dimensional accuracy does not deteriorate due to melting of the resin, depending on the resin used. Good.

Therefore, the present invention is a composite of a resin and a filler which comprises 10 to 70% by volume of a thermosetting resin and the balance of a filler having an average particle size of 40 μm or less, and is subjected to powder pressure molding at room temperature. After that, it was found that the moldability can be improved even if the filler content is increased by releasing from the mold and curing by heating.

The resin-ceramic composite produced by the above method using the ceramic powder as the filler can improve the heat resistance, and the deflection temperature under load is 150.degree. C. or more. Therefore, it can be used for members requiring heat resistance.

Further, if the average particle size of the ceramic powder is reduced, the tracking resistance can be improved to 250 V or more.

According to the manufacturing method as described above, a composite of a resin and a filler having extremely excellent dimensional accuracy can be easily manufactured, and further, the resin and the filler of the present invention which have high added value and high reliability can be manufactured. The composite can be widely used in various applications such as electronic parts, structural parts, mechanical parts, mechanical parts, automobile parts, OA equipment parts, functional (conductive, magnetic, dielectric) parts and slidable parts. . Specifically, cases, lids for storing various electric elements such as resistors, thermostats, and thermal fuses, wire guides for dod printers, bearings for motors widely used in OA equipment, and various sliding guide members such as spacers. Alternatively, it is used as a holder or the like for a portion accompanied by a heat generating portion such as a thermal head printer, a liquid absorbing core or a magnet in a liquid mosquito trap.

[0044]

EXAMPLES Example 1 Examples of the present invention will be described below.

Epoxy resin powder and phenol resin powder are used as the thermosetting resin, and SiO ₂ and A are used as the filler.
Using l ₂ O ₃ , raw materials were prepared in which the resin content and the average particle size of the filler were variously changed as shown in Tables 1 to 4. Furthermore, after granulating into powder-moldable granules, each raw material is pressure-molded at room temperature and then heat-cured at 100 to 200 ° C. so that the final dimensions are 20 mm in outer diameter × 1 mm in thickness. 20 tablet-shaped test pieces were prepared.

The outer diameter of each of the 20 test pieces obtained was measured, and the measured value having the largest difference from the center standard value was set to 20 mm as the center standard value.
~ 4. Table 1 shows a combination of epoxy resin and SiO ₂ , Table 2 shows a combination of epoxy resin and Al ₂ O ₃ , Table 3 shows a combination of phenol resin and SiO ₂ , and Table 4 shows a combination of phenol resin and Al ₂ O ₃ . is there.

According to Tables 1 to 4, when the amount of the resin is less than 10% by volume, the dimensional accuracy is high, but the strength of both the molded body and the test piece after heat curing is weak and it is not practical. On the other hand, when the amount of resin exceeds 70%, deformation due to melting of the resin occurs,
The size is 20.1 mm or more, and the center standard value is 20 mm
It deviated from the range of ± 2.0%. further,
Some of the fillers having a particle size of more than 40 μm have high dimensional accuracy, but the surface roughness is poor and the appearance and surface characteristic properties are poor.

In contrast to these, the amount of resin is 10 to 70% by volume,
In the embodiment of the present invention in which the particle size of the filler is 40 μm or less, the dimension is within the range of 19.9 to 20.1 mm, and the dimensional accuracy ±
It can be seen that it has reached 2.0%.

[0049]

[Table 1]

[0050]

[Table 2]

[0051]

[Table 3]

[0052]

[Table 4]

Next, using a composite of a resin and a filler comprising 40% by volume of an epoxy resin and 60% by volume of SiO ₂ having an average particle size of 10 μm as a filler, as shown in FIG. A rectangular parallelepiped test piece 1 and FIG.
A disc-shaped test piece 2 having a through hole 2a as shown in was prepared. Five test pieces were prepared, and the long side and the short side of the rectangular parallelepiped test piece 1 were measured, and the thickness and the diameter of the through hole 2a were measured for the disc-shaped test piece 2 having the through hole 2a. It was measured.

The mold dimension was set as the center standard value, and the ratio of the difference between the measured value and the center standard value was calculated as the dimensional accuracy. The results are as shown in Table 5 (cuboid) and Table 6 (disk).

From these results, it is understood that the dimensional accuracy of all the test pieces is within ± 2.0%, and high dimensional accuracy can be obtained even with such a shape.

[0056]

[Table 5]

[0057]

[Table 6]

It should be noted that, in the above embodiments, the mold dimension was set as the central standard value, and the ratio of the difference between the measured value and the central standard value was set as the dimensional accuracy. However, the average value of each measured value was set as the central standard value. It is also possible to calculate the ratio of the difference between the measured values as the dimensional accuracy. Even in this case, it was confirmed that the resin-filler composites of the examples of the present invention could obtain a dimensional accuracy of ± 2.0%.

Further, in order to carry out the production method of the present invention, it is necessary to granulate the resin composite material into a powder granule having good flowability so that it can be uniformly filled in the mold. Then, as shown in FIG. 1, a structure in which the surface of the composite of the resin and the filler manufactured by using such granular powder is magnified 100 times, the filler 32 is provided around the particulate resin portion 31. The feature is that they are distributed and scattered, and such a structure can be easily observed with a metallurgical microscope or an electron microscope (SEM).

Example 2 (Void) As the thermosetting resin, carbon fiber (CF) was used with a phenol resin as a filler. Regarding the compounding ratio of the phenol resin and the carbon fiber, as shown in Tables 7 and 8, various changed raw materials were prepared. Each raw material was pressure-molded at room temperature and then heat-cured at 80 to 250 ° C. to prepare a test piece.

In order to observe the average pore state of the obtained test piece, the surface was shaved, a metallographic photograph was taken, and the average particle diameter of the pores and the area occupation rate of the pores were calculated by image processing. . The amount of wear of the ball and the disk was measured by a ball-on-disk method in which the resin-filler composite was formed into a ball shape and the disk was rotated while being pressed against the disk made of alumina or stainless steel.

The results are shown in Tables 7 and 8. From these results, it is found that the examples of the present invention (No. 5 to 8) in which the average diameter of the pores is 15 to 80 μm and the area occupancy is 5 to 30% have a small amount of wear and are excellent in slidability. It was

[0063]

[Table 7]

[0064]

[Table 8]

Example 3 (Heat resistance) A phenol resin was used as a thermosetting resin, and alumina (Al ₂ O ₃ ) was used as a filler. Raw materials were prepared by varying the compounding ratio of the phenol resin and alumina and the average particle size of alumina as shown in Table 9. Each material was pressure-molded at room temperature and then heat-cured at 80 to 250 ° C. to prepare a test piece.

Table 9 shows the results of measuring the deflection temperature under load for the obtained test pieces. The measuring method is JIS
According to the method of K 7207.

Specifically, for example, as shown in FIG.
DC (HEAT DISTORTION TEMPER
6.4 × 1 in a heat transfer medium using an ATURE) tester
The test piece 1 of 2.7 × 110 mm is supported with a span of 100 mm, and the stress is 18.5 k with the center load bar 11 and the weight 12.
The temperature at which the temperature of the heat transfer medium is raised at 2 ° C./min while applying a load of gf / cm ² , 4.6 kgf / cm ² , and the deflection of the test piece 1 reaches 0.25 mm by the wire gauge 13. Can be determined by measuring with a thermometer 14.

According to Table 9, when the content of the phenol resin was 20% by volume or less, the shape of the molded body after pressure molding at room temperature could not be retained. On the other hand, when the content is 80% by volume or more, the shape cannot be maintained during heat curing, which is not practical.

On the other hand, when the content of the phenol resin is in the range of 30 to 70% by volume, all of them are 150
It can be seen that it exhibits a high deflection temperature under load of ℃ or more. Further, the deflection temperature under load is improved as the content of the phenol resin is decreased and the content of the alumina is increased. Generally, the deflection temperature under load of phenol resin itself is 16
Since it is 0 ° C., it is understood that the deflection temperature under load can be greatly improved by adding the alumina powder.

[0070]

[Table 9]

Next, the same experiment was conducted for various combinations of resin and ceramic. Phenol resin-silica (SiO ₂ ) is shown in Table 10, phenol resin-steatite (MgO · SiO ₂ ) is shown in Table 11,
Table 12 shows unsaturated polyester resin-alumina (Al ₂ O ₃ ) and Table 13 shows epoxy resin-silica (SiO ₂ ).
, Respectively.

In any combination of materials, the thermosetting resin is 30 to 70% by volume and the ceramic is 70 to 70% by volume.
When it was 30% by volume, the deflection temperature under load could be 150 ° C or higher.

[0073]

[Table 10]

[0074]

[Table 11]

[0075]

[Table 12]

[0076]

[Table 13]

Example 4 (Tracking resistance) A phenol novolac resin was used as a thermosetting resin,
Alumina (Al ₂ O ₃₎ and mullite _{(3Al 2 O 3 · 2SiO 2} ) used as a ceramic, an average particle diameter of the mixing ratio and the ceramics as shown in Table 14, the raw material powder was changed in various The mixture was weighed and mixed, and then the mixture was subjected to powder pressure molding at room temperature and heat-treated at 80 to 250 ° C. to be heat-cured to obtain a test piece of a resin-filler composite.

With respect to the test piece thus obtained, the deflection temperature under load was measured by the method of JIS K 7207 in the same manner as in Example 3, and the tracking resistance was measured by the IEC Pub112 method. The results are shown in Tables 14 and 15.

As shown in FIG. 5, the tracking resistance was measured by contacting the two platinum electrodes 21, 21 on the test piece 1 with a crimping load of 1 N and applying a commercial AC voltage between the electrodes 21, 21. Apply. In this state, from the top of the test piece 1 to the electrode 2
Test solution 22 of 0.1% NH4Cl is dropped every 30 seconds in the center between 1 and 21 to perform tracking breakdown (0.5A).
Current flows for 2 seconds). Graph the results,
The voltage that causes dielectric breakdown is calculated by dropping 50 drops, and this voltage is used as the tracking resistance (CTI: Comparative).
Tracking Index).

According to Tables 14 and 15, the average particle size of alumina is larger than 5 μm (Nos. 1, 2, 8 and 9) and the ratio of resin to ceramics is outside the scope of the present invention (No. 3). , 10), the tracking resistance does not reach 250 V, and in particular, when the compounding amount of the resin exceeds 70% by volume (No. 3, 10), the deflection temperature under load becomes low.

On the other hand, those within the scope of the present invention (N
o. 4-7, 11-13) has a tracking resistance of 25.
Excellent results were obtained with 0 V or more and a deflection temperature under load of 200 ° C. or more. Since the phenol resin itself generally has a tracking resistance of about 130 V, it can be understood that the tracking resistance can be greatly improved by adding ceramic powder.

[0082]

[Table 14]

[0083]

[Table 15]

[0084]

As described above, according to the present invention, epoxy,
Under the condition that the amount of thermosetting resin such as phenol resin is 10 to 70% by volume and the balance is a filler particle diameter of 40 μm or less, the powder is granulated into granules, and after normal temperature powder pressure molding, heat curing is performed. Provide a resin composite material that has excellent heat resistance, high electrical reliability, high reliability, and excellent sliding characteristics by providing uniform pores inside, in a very simple manufacturing process. be able to.

[Brief description of drawings]

FIG. 1 is an enlarged view schematically showing the structure of a resin-filler composite of the present invention.

FIG. 2 is a perspective view showing a test piece made of a composite of a resin and a filler of the present invention.

FIG. 3 is a perspective view showing a test piece composed of a composite of a resin and a filler of the present invention.

FIG. 4 is a view showing an apparatus for measuring a deflection temperature under load.

FIG. 5 is a diagram showing a tracking resistance measuring device.

[Explanation of symbols]

1,2: test piece 31: Resin part 32: Filler 33: Pore

─────────────────────────────────────────────────── ─── Continuation of the front page (51) Int.Cl. ⁷ Identification code FI // B29K 101: 10 B29K 101: 10 105: 16 105: 16 (72) Inventor Saeki Nakamura 1810 Takashiro-cho, Kawauchi City, Kagoshima Prefecture Address Kyocera Co., Ltd. Kagoshima Kawauchi Plant (56) Reference JP-A-57-84510 (JP, A) (58) Fields investigated (Int.Cl. ⁷ , DB name) C08L 1/00-101/16

Claims (9)

(57) [Claims] 1. A thermosetting resin in an amount of 10 to 70% by volume, and the balance comprising a filler having an average particle size of 40 μm or less, and having a dimensional accuracy of ± 2.0% with respect to a center standard value. A composite of a resin and a filler. 2. A composite of a resin and a filler, which comprises 10 to 70% by volume of a thermosetting resin and the balance of a filler having an average particle diameter of 40 μm or less, and has no fine irregularities on the surface. 3. A resin and a filler characterized by comprising 10 to 70% by volume of a thermosetting resin and the balance of a filler having an average particle diameter of 40 μm or less, and the filler is scattered around the particulate resin portion. Complex of. 4. The resin-filler composite according to claim 1 , wherein the resin amount is 10 to 40% by volume. 5. A method according to claim 1, characterized in that the filler with a powder or fibers of organic material or inorganic material
7. A composite of the resin and the filler according to any one of 1. 6. The average pore diameter inside the molded body is 15 to 80 μm.
In, and the resin and composite filler as claimed in claim 1, the occupied area ratio, characterized in that 3 to 30%. 7. deflection temperature under load 0.99 ° C. or higher, the resin and the composite filler according to claim 1, tracking resistance is equal to or not less than 250V. 8. A thermosetting resin powder such as epoxy resin or phenol resin is mixed with a filler having an average particle size of 40 μm or less, and the raw material powder is pressure-molded into a predetermined shape at room temperature and then released. A method for producing a composite of a resin and a filler, which comprises a step of heating and curing at 100 to 250 ° C. 9. The composite of resin and filler according to claim 8, wherein the specific gravity of the resin is smaller than the specific gravity of the filler to be mixed and added, and the granules subjected to the granulation process are used for pressure molding. Body manufacturing method.