JP6227232B2 - Heat dissipating paint and heating element coated with it - Google Patents

Description

  The present invention relates to a heat dissipating paint and a heating element applied with the heat dissipating paint, and more particularly to a heat dissipating paint excellent in transparency and a heating element applied with the heat dissipating paint.

  Conventionally, Patent Document 1 discloses a heat dissipating paint that can increase the amount of heat dissipated by being applied to a heat dissipating body after having a coating property necessary for a paint and a shape maintaining property after coating. This heat-dissipating paint comprises 100 parts by mass of (meth) acrylic acid ester polymer (AP1), 5 parts by mass to 180 parts by mass of expanded graphite powder, and a solvent 100 for dissolving (meth) acrylic acid ester polymer (AP1). It is supposed that it is included in the range of no less than 1000 parts by mass.

JP 2012-46620 A

  However, the heat dissipating paint disclosed in Patent Document 1 has a limited heat dissipating effect, and further improvements are required. In addition, the heat dissipating paint disclosed in Patent Document 1 has a relatively large content of graphite powder. If it does so, the heat generating body which apply | coated the thermal radiation coating will be influenced by the color of graphite powder, and the applied surface will typically become black.

  If this is the case, if the heat radiation paint is not visible to the human eye as in the interior of the appliance, there will be no adverse visual effects, but if it is visible to the human eye as in the exterior of the appliance, Adverse effects can occur.

  In an extreme case, when the heating element is required to have translucency, such as a lighting device such as a light bulb, the heat radiation paint disclosed in Patent Document 1 is applied to the glass sphere. It is unrealistic to take measures against heat dissipation by the above because the light emitted from the light source is blocked by the glass sphere surface.

  Accordingly, an object of the present invention is to provide a heat dissipating paint which has a heat dissipating effect higher than that of a conventional heat dissipating paint, and preferably has excellent translucency, and a heating element coated with the heat dissipating paint.

In order to solve the above problems, the present invention provides:
In the heat dissipating paint containing heat dissipating filler to the binder,
Using a resin as the binder,
Using a fired plant as the heat dissipation filler,
The plant fired body is contained at 10% by weight or less with respect to the resin.

  The plant fired body may control at least one of its firing temperature and particle size.

  The plant fired body may be any one of rice bran, rice husk, soybean hulls, rapeseed meal, sesame meal, cottonseed meal, cotton hull, soybean hulls, and cacao husk.

  The resin preferably has a heat dissipation effect. Further, the resin may have translucency.

  Moreover, the heat generating body of this invention is apply | coated on the conditions from which the thermal radiation film formed with the said thermal radiation coating material becomes a film thickness of 100 micrometers or less, for example. This film thickness is preferably 70 μm or less, more preferably 10 μm to 30 μm.

Furthermore, the present invention is a plant fired body used for the heat radiation paint,
One of rice bran, rice husk, soybean hulls, rapeseed meal, sesame meal, cottonseed meal, cotton hull, soybean hulls, and cacao husk is fired, and the median diameter is 30 μm to 85 μm.

BEST MODE FOR CARRYING OUT THE INVENTION

  Hereinafter, embodiments of the present invention will be described with reference to the drawings and tables.

  First, the outline | summary of the thermal radiation coating material of this embodiment is demonstrated. The heat dissipating paint of this embodiment contains a heat dissipating filler with respect to the binder, and this point is the same as in the case of a known heat dissipating paint.

  In the heat dissipating paint of this embodiment, a resin containing a translucent resin is used as a binder. The binder according to the present embodiment preferably has translucency and may contain a heat dissipating filler. Therefore, either a thermoplastic resin or a curable resin can be used. The type of resin is not particularly limited as long as it satisfies the conditions required for the above-mentioned binder. A homopolymer such as acrylic, vinyl, polycarbonate, polyester, polyether, urethane, epoxy, etc. A polymer etc. can be widely used.

  In addition, the translucent resin according to the present embodiment preferably has a polar group, and a resin having high adhesion to the application target can be used. However, as will be described later, this kind of requirement is not essential because there is a case where not so much adhesion is required depending on the application.

  Moreover, the heat-radiation coating material of this embodiment uses the plant baking body as a heat-radiation filler. From the measurement results described below, it can be considered that the raw material of the plant fired body is unquestioned, but it was still found that there is a difference in the heat dissipation effect depending on the raw material. In any case, it is important that the heat-dissipating paint of this embodiment uses a plant fired body as a heat-dissipating filler.

  In this embodiment, rice bran, rice husk, and soybean hulls were selected as raw materials for the plant fired body, and specific heat radiation effect measurement was performed. However, the physical properties and electrical properties of these fired bodies are similar to those of rapeseed meal, sesame meal, cottonseed meal, cotton hulls, soybean hulls, cacao husks, etc. It is thought that there is a heat dissipation effect.

  Moreover, it turned out that the thermal radiation effect of the thermal radiation coating material of this embodiment changes with the calcination temperature and particle size of a plant baking body as a thermal radiation filler. Furthermore, it has been found that the heat radiation effect varies depending on the thickness of the coating film formed on the heating element by the heat radiation paint.

  By the way, as it is described in Patent Document 1 that graphite powder is used as a heat dissipating filler, carbon generally has a heat dissipating action. Therefore, for example, carbon black can be used as a heat dissipating filler, and this point is known.

  Surprisingly, however, when a plant fired body is used as the heat dissipating filler, the content relative to the binder is small compared to the case of using general carbon black disclosed in Patent Document 1 and the like. It was also found that an excellent heat dissipation effect can be obtained. The content was completely different from that of general-purpose carbon black. Since the heat dissipating filler is usually more expensive than the binder, the heat dissipating paint can be applied with a small amount of heat dissipating filler. Therefore, the heat dissipating paint of this embodiment is advantageous in terms of cost.

  Moreover, carbon is usually black to some extent, but if the content in the binder is very small and the carbon itself is fine and can be sufficiently diffused into the binder, the heat dissipation filler If the color of itself cannot be visually recognized by human eyes, and a light-transmitting resin is selected as a binder, a heat-radiating paint excellent in light-transmitting property can be obtained.

  In this embodiment, the plant baking body is contained at 10 wt% or less with respect to the translucent resin. As will be described later, an excellent heat dissipation effect could be obtained even at 3% depending on the type of the plant fired body, and an excellent heat dissipation effect could be obtained even at 0.5% under the minimum conditions.

  Next, the method for producing a burned plant according to the present embodiment will be described using a soybean hull as a raw material as an example.

  Here, when edible oil or the like is produced using soybean as a raw material, a large amount of soybean hulls are generated. Most of these have been reused for livestock feed and agricultural fertilizers, but further uses have been explored. As a result of studying day and night from the viewpoint of ecology, it was found that the burned body of soybean hulls is beneficially used as a heat dissipating filler as a further reuse of soybean hulls. In addition, apart from whether it is a food residue or not, the manufacturing process in the case of using something other than soybeans as the raw material of the burned plant may be the same as the process described below.

  FIG. 1 is a schematic production process diagram of a burned soybean hull according to the present embodiment. First, raw soybean hulls generated during the production of edible oil, etc. are set in a carbonization device, and the temperature is increased by about 2 [° C.] per minute in an inert gas atmosphere such as nitrogen gas or in vacuum, and 700 A predetermined temperature such as [° C.] to 1500 [° C.] (for example, 900 [° C.]) is reached. Then, a carbonization baking treatment is performed at an ultimate temperature for about 3 hours. As the carbonization apparatus, a stationary furnace, a rotary kiln, or the like can be used.

  In addition, in manufacturing each plant fired body, it is also a method to include a phenol resin such as a resol type phenol resin and then set it in a carbonization apparatus. When a resol type phenol resin or the like is mixed, the strength and carbon content of the burned soybean hulls can be improved. However, it should be noted that the mixing itself is not always necessary for manufacturing the heat conducting member of the present embodiment.

  Next, the baked soybean hulls are crushed and then sieved using, for example, a 106 μm square mesh. Through the sieving process, a burned soybean hull having a median diameter of, for example, about 4 μm to about 85 μm (for example, 60 μm) is obtained. In the present embodiment, a burned soybean hull was manufactured through the above steps. Under the above sieving conditions, about 80% of the whole baked product such as soybean hulls is 85 μm or less. In this case, the median diameter is, for example, about 30 μm to about 60 μm. Hereinafter, unless otherwise specified, the particle diameter of the burned soybean hulls will be described as the median diameter.

  The median diameter was measured using a laser diffraction particle size distribution analyzer SALD-7000 manufactured by Shimadzu Corporation. In this embodiment, a burned soybean hull having a median diameter of, for example, 30 μm to about 60 μm, and a selectively burned soybean hull obtained by selectively further pulverizing to obtain a burned soybean hull having a minimum median diameter of approximately 1 μm.

  The fine pulverization referred to in this specification means pulverization so that the median diameter of the material before pulverization is lowered by about one digit order. Therefore, for example, if the median diameter before pulverization is 30 μm, it means pulverization to be 3 μm. However, the fine pulverization does not mean that the median diameter before fine pulverization is strictly reduced by about an order of magnitude, but is pulverized so that the median diameter before fine pulverization is, for example, 1/5 to 1/20. Including. In the present embodiment, pulverization was performed in such a manner that the median diameter after pulverization is 1 μm when the median diameter is minimum.

  Next, component analysis by the ZAF quantitative analysis method was performed on the burned soybean hulls thus produced. For C, H, and N elements, component analysis by organic elemental analysis was also performed. In addition, the baking temperature was about 900 [° C.], and the median diameter was within the range of about 30 μm to about 60 μm. In addition, component analysis was also performed on each baked product of rapeseed meal, sesame meal, cottonseed meal, cotton hull, and cacao husk produced in the process shown in FIG.

  As an analysis result, it can be evaluated that the ratio of the organic elements contained in each plant fired body is the same. This seems to be caused by the fact that soybean hulls and rapeseed meal are both plants. Still, the burned rapeseed meal, sesame meal, and cottonseed meal have a commonality of oil cake, so “N” is relatively large, and the increase rate of “C” before and after firing is relatively high. Is low.

  On the other hand, the same results were obtained for the burned bodies of soybean hulls and cotton hulls because of the commonality of the hulls. Specifically, “N” is relatively small, and “C” before and after baking. The rate of increase is relatively high. On the other hand, the cacao husk fired body is similar in that “N” is relatively small compared to the burned soybean hull, but the increase rate of “C” before and after firing is relatively low. I can say that. Focusing on “C”, cotton hull is the highest (about 83%) and sesame meal is the lowest (about 63%).

  Below, the manufacturing method of the thermal radiation coating material of this embodiment is demonstrated. First, an acrylic urethane resin was used as the translucent resin as a binder. With respect to this translucent resin, each fired body of rice bran, rice husk, and soybean hulls was contained together with required additives at a ratio of 10% by weight or less. Then, they were sufficiently stirred to sufficiently diffuse the plant fired body in the translucent resin. Thus, the heat dissipating paint of this embodiment was completed.

  FIG. 2 is a measurement system diagram for examining the heat radiation effect of the heat radiation paint of the present embodiment. FIG. 2 shows a windshield case 100 for measuring the heat dissipation effect with high accuracy, a resistor 10 that is a heating element housed in the windshield case 100, and a first surface attached to the resistor 10. The heat-conductive double-sided tape 20, the heat-radiating plate 30 to which the second surface of the heat-conductive double-sided tape 20 is attached, and the heat-dissipating coating 40 made of the heat-dissipating paint of this embodiment applied to the heat-radiating plate 30 are shown. Yes.

  Hereinafter, the measurement result performed according to the measurement system diagram shown in FIG. 2 is shown as an example together with a comparative example.

  Table 1 shows the relationship between the type of heat dissipating filler in the heat dissipating paint to be the heat dissipating coating 40 shown in FIG. 2, the content of the plant fired body relative to the translucent resin, the particle size of the heat dissipating filler, and the film thickness corresponding to these. It is a table | surface which shows.

As shown in Table 1,
Example 1: A heat radiation coating having a thickness of 40 μm was formed by a heat radiation paint containing 3.0% of a burned soybean hull having a particle size of 30 μm and a light-transmitting resin at a firing temperature of about 900 ° C. Formed,
Example 2: A heat-dissipating film having a thickness of 30 μm was formed by a heat-dissipating paint containing 3.0% of a burned soybean hull having a particle size of 24 μm and a baking temperature of about 3000 ° C. with respect to the translucent resin. Formed,
Example 3: A heat radiation coating 40 having a thickness of 40 μm formed by a heat radiation paint containing 3.0% of a rice bran fired body having a particle size of 60 μm with respect to a translucent resin,
Example 4: A heat radiation coating 40 having a thickness of 40 μm was formed by a heat radiation paint containing 5.0% of a rice husk fired body having a particle size of 60 μm with respect to the translucent resin,
Example 5: A heat radiation coating 40 having a thickness of 40 μm formed of a heat radiation paint containing 3.0% of a rice husk fired body having a particle size of 60 μm with respect to the light-transmitting resin,
Example 6: A heat radiation coating 40 having a thickness of 30 μm was formed by a heat radiation paint containing 1.0% of a rice husk fired body having a particle size of 60 μm with respect to the translucent resin.
Example 7: A heat radiation coating 40 having a thickness of 30 μm formed by a heat radiation paint containing 0.5% of a rice husk fired body having a particle size of 60 μm with respect to the translucent resin,
Example 8: A heat radiation coating 40 having a thickness of 30 μm formed by a heat radiation paint containing 1.0% of a rice husk fired body having a particle size of 2.4 μm with respect to the translucent resin,
Prepared. In all of Examples 1 to 8, the fired plant is used as a heat dissipating filler, and as is clear from the measurement results of the light transmittance described later, all are excellent in translucency.

As a comparative example,
Comparative Example 1: Heat radiated only by the heat radiating plate 30 without forming the heat radiating coating 40,
Comparative Example 2: A heat radiating paint from another company was applied to the heat radiating plate 30 to a thickness of 30 μm.
Prepared.

  For the measurement of the heat dissipation effect, an aluminum plate having a size of 40 mm × 40 mm × 0.5 mm was prepared as the heat sink 30. In the case of Examples 1 to 8, various heat radiation coatings were applied to the heat radiating plate 30 so as to have a desired film thickness, and the heat radiating coating 40 was formed. The resistor 10 used was PDX1R0000D, 10 mm × 15 mm, manufactured by Alpha Electronics, having a resistance value of 1Ω. A voltage of 1.5 V was applied to the resistor 10 for about 30 minutes, and the temperature in the vicinity of the center of the surface of the resistor itself was measured in a state where it became a heating element.

  Table 2 is a table | surface which shows the temperature result of Examples 1-8 and Comparative Examples 1-3. For each of the examples and comparative examples, temperature measurement was performed three times, and Table 2 lists the average values of these temperature measurement results. In Table 2, the temperature result when the heat sink 30 is not attached is added to the first stage, and the temperature difference based on the temperature result of Comparative Example 1 and the film thickness shown in Table 1 are also shown. It is added.

  First, the temperature of the resistor 10 itself without the heat sink 30 was 98.4 ° C. On the other hand, as shown in Comparative Example 1, the temperature of the resistor 10 to which the heat sink 30 was attached was 58.5 ° C. Therefore, it can be seen that a heat dissipation effect of about 40 ° C. can be obtained when the heat sink 30 is attached.

  As will be understood by those skilled in the art of heat dissipation, a temperature of about 5 ° C. is further increased from the temperature that can be lowered by attaching the heat dissipation plate 30 together with some additional elements (for example, inexpensive and translucent. Or even lower) is a challenge for the industry.

  By the way, most of the heat-dissipating paints that are currently available on the market can only achieve a temperature drop of about 3 ° C from the state where the heat-radiating plate 30 is attached, and almost all of these types have almost no translucency. is there.

  Therefore, when comparing current commercial products with those of Examples 1 to 8, those of Examples 1 to 8 can realize a temperature drop of 3 ° C. or more as shown in Table 2. It has a useful effect of being excellent in properties.

  Next, see Comparative Example 2. Comparative Example 2, which is a product of another company that is commercially available, could only achieve a temperature drop of 3.4 ° C. relative to Comparative Example 1.

  Reference is now made to Example 1. The temperature result shown in Example 1 which employs a burned soybean hull with a baking temperature of 900 ° C. was able to realize a temperature drop of 5.7 ° C. relative to Comparative Example 1. Moreover, the material of Example 1 is excellent in terms of translucency because it can realize the content of the burned plant with respect to the translucent resin in an extremely small amount, and has the advantage that the heat radiation coating 40 can be made inexpensive. .

  Next, see Example 2. The temperature result shown in Example 2 which employs a burned soybean hull with a baking temperature of 3000 ° C. was only able to realize a temperature drop of 4.4 ° C. relative to Comparative Example 1. And since the thing of Example 2 is baking at high temperature compared with Example 1, the production cost of the plant baking body itself will increase to that extent. Of course, the advantage of Example 2 is that it is excellent in translucency since the content of the plant fired body with respect to the translucent resin can be realized in a very small amount, and the advantage that the heat radiation coating 40 can be made inexpensive is the advantage. is there.

  Reference is now made to Example 3. The temperature result shown in Example 3 in which the rice bran fired body was employed was 6.6 ° C. lower than that in Comparative Example 1. This is the most excellent temperature drop among Examples 1-8. Of course, the third embodiment has the same advantages as the first and second embodiments.

  Reference is now made to Examples 4-7. In Examples 4 to 7 employing the rice husk fired body, the raw material of the heat radiating filler is the same, only by changing the content of the rice husk fired body with respect to the translucent resin and the thickness of the heat radiation coating 40. Any of Examples 4-7 has the same advantages as Examples 1-3.

  Subsequently, when the mutual comparison in Examples 4 to 7 is performed, between Examples 4 and 5 having the same film thickness of 40 μm, the content with respect to the translucent resin is 5.0% compared to Example 4. However, since the temperature drop of Example 5 of 3.0% is superior, it is better that the content is smaller. On the other hand, in the case of Example 6 and 7 having the same film thickness of 30 μm, the temperature of Example 6 with 1.0% is higher than that of Example 7 with a content of 0.5% for the translucent resin. Since the decrease is excellent, it is presumed that only the content is not a factor for determining the temperature decrease.

  Next, paying attention to the difference in film thickness, when arranged in order of excellent temperature drop, Example 5 was set to 40 μm, Example 6 was set to 30 μm, Example 7 was set to 30 μm, and Example 4 was set to 40 μm. Thus, it can be seen that only the film thickness is not a factor for determining the temperature drop.

  However, when the film thickness was increased from 70 μm and the other conditions were the same as in Examples 1 to 8, the temperature drop was inferior. As this reason, it is assumed that heat is stored in the heat radiation coating film 40 as the heat radiation coating film 40 becomes thick, resulting in a decrease in the heat radiation effect. However, in order to prevent a temperature drop, it is not essential that the film thickness be 70 μm or less. Depending on other conditions such as the size of the heat radiation filler, even if the film thickness is about 100 μm, Note that the temperature may not drop.

  On the other hand, with respect to Example 6, the film thickness was changed to 40 μm, 10 μm, and 20 μm, and the grain size of the rice husk fired body was set to 26.6 μm, 5.8 μm, and 5.8 μm. As a result, a temperature drop of 3.6 ° C., 4.1 ° C., and 2.9 ° C. was obtained with respect to the temperature according to Comparative Example 1, respectively.

  Next, refer to Example 8. In Example 8 employing the finely pulverized rice husk fired body, the presence or absence of fine pulverization is different in relation to Example 6. Comparing the measurement results of Examples 6 and 8, it can be seen that the temperature drop is inferior due to fine pulverization. Therefore, according to this result, it can be said that the particle size of the burned plant needs to have a certain size. The reason for this is assumed to be due to the relationship between the thickness of the heat radiation coating 40 and the particle size of the plant fired body.

  That is, when the particle size of the plant fired body exceeds the thickness of the heat radiation coating 40, the plant fired body is in a state in which the surface is in direct contact with or close to the surface of the heat sink 30. And the position on the opposite side to the contact point protrudes from the surface of the heat radiation coating 40 and is in direct contact with the atmosphere or a state close thereto.

  If it does so, the heat | fever of the heat sink 30 will be discharge | released directly to air | atmosphere through a plant baking body, ie, a thermal radiation filler. Although it is clear that the heat radiating effect of the translucent resin according to the present embodiment is excellent, it is obvious that the heat radiating filler is superior. It is important to control.

  However, it is thought that the heat dissipation effect is improved as the particle size of the plant fired body increases, but on the other hand, if the size is such that humans can see the plant fired body with the naked eye, the design is reduced. End up. Therefore, it can be said that it is preferable to determine the particle size of the plant fired body from the relationship between the heat dissipation effect and the translucency.

  Summarizing the above, as described above, Examples 1 to 8 have the advantage of superior translucency compared to the current commercial products, but the heat dissipation effect is reduced due to the heat storage of the heat dissipation coating 40. In order to avoid this, the particle size of the burned plant should be 70 μm or less, and the particle size of the calcined plant may not be too small or too large due to the relationship between the heat dissipation effect and the translucency. It is not good to make it too large, and in terms of median diameter, it should be about 60% to 120% of the film thickness of the heat radiation coating 40, and the firing temperature for producing the plant fired body is not high enough to graphitize. Is good.

  When the translucent resin according to the heat radiation paints of Examples 1 to 8 is used, since there is adhesion to metal and resin, it can be used for various heating elements that require heat radiation performance. In particular, since it can be dried at room temperature, it can also be used for a heating element in which heating is inappropriate. However, since this translucent resin also has a heat-resistant temperature, for example, a heating element having a temperature of several hundred degrees Celsius has a binder function even at that temperature, and is an ultraviolet curable type having excellent translucency. A resin or the like may be selected.

  Next, a transparent polycarbonate plate with a size of 30 mm x 110 mm x 1 mm is prepared as a substrate, and the particle size of the fired plant to be contained in the translucent resin and various contents are applied to the substrate. By doing so, the heat radiation film 40 was formed, and each light transmittance was measured.

  Table 3 is a table | surface which shows the measurement result of the light transmittance which concerns on the thermal radiation coating material of a present Example. Specifically, the light transmittance was measured using an ultraviolet-visible spectrophotometer UV mini-1240 manufactured by Shimadzu Corporation. In addition, all the types of plant fired bodies were rice husk fired bodies.

As shown in Table 3, the samples in this example are as follows.
Sample A: A heat-radiating film having a thickness of 30 μm is formed on a substrate with a heat-dissipating paint containing 1.0% of a rice husk fired body having a particle size of 60 μm with respect to the light-transmitting resin.
Sample B: A heat-radiating film having a thickness of 30 μm is formed on a substrate by a heat-dissipating paint containing 0.5% of a rice husk fired body having a particle size of 60 μm.
Sample C: A heat-radiating film having a thickness of 20 μm is formed on a substrate with a heat-dissipating paint containing 1.0% of a rice husk fired body having a particle size of 23 μm with respect to the translucent resin.
Sample D: A heat-radiating film having a thickness of 10 μm is formed on a substrate by a heat-dissipating paint containing 1.0% of a rice husk fired body having a particle size of 5.8 μm with respect to the translucent resin. .
Sample E: A heat radiation coating film having a thickness of 20 μm is formed on a substrate by using a heat radiation paint containing 1.0% of a rice husk fired body having a particle size of 5.8 μm with respect to the translucent resin. .
Sample F: A heat-radiating film having a thickness of 10 μm is formed on a substrate by a heat-dissipating paint containing 3.0% of a rice husk fired body having a particle diameter of 2.4 μm with respect to the light-transmitting resin. .
Sample G: A heat radiation coating film having a thickness of 20 μm is formed on a substrate with a heat radiation paint containing 3.0% of a rice husk fired body having a particle size of 2.4 μm with respect to the light-transmitting resin. .
Sample H: A heat radiation coating having a thickness of 10 μm is formed on a substrate with a heat radiation paint containing 1.0% of a rice husk fired body having a particle size of 2.4 μm with respect to the light-transmitting resin. .
Sample I: A heat-radiating film having a thickness of 20 μm is formed on a substrate with a heat-dissipating paint containing 1.0% of a rice husk fired body having a particle size of 2.4 μm with respect to a light-transmitting resin. .

  As shown in Table 3, it can be seen that the light transmittance of the sample B is high regardless of the wavelength condition set in the ultraviolet visible spectrophotometer. Next, similarly, it can be seen that the light transmittance is higher in the order of sample C and sample A.

  When the particle size of the burned plant was small, the light transmittance decreased. Therefore, it can be said that it is good to contain a fired plant having a large particle size with respect to the translucent resin.

  When the content of the burned plant was high, the light transmittance was lowered. Therefore, it can be said that it is good to contain a small amount of a plant fired body with respect to the translucent resin.

  When the film thickness of the heat dissipating film was thick, the light transmittance was lowered. Therefore, it can be said that the heat dissipation film should be thin.

  3 to 8 are photomicrographs of sample A and the like. 3 is a micrograph of sample A, FIG. 4 is a micrograph of sample B, FIG. 5 is a micrograph of sample C, FIG. 6 is a micrograph of sample D, FIG. 7 is a micrograph of sample F, In FIG. 8, the thickness of the heat-dissipating film in Sample B is changed to 10 μm, that is, the substrate is formed by a heat-dissipating paint containing 1.0% of a husk fired body having a particle diameter of 40 μm with respect to the translucent resin. The micrograph of what formed the 10-micrometer-thick heat dissipation film with respect to FIG.

  First, when FIG. 3 and FIG. 4 are compared, they have only a difference in content of 0.5%, and other conditions remain the same, but there is a large difference in brightness depending on the visual recognition level between them. There wasn't. Next, when FIG. 3 is compared with FIG. 8, they have only a film thickness difference of 20 μm, and other conditions remain the same, but there is no significant difference in brightness depending on the visual recognition level between them. .

  3 and FIG. 5 are different from FIG. 3 in that the film of FIG. 5 is thinner by 10 μm and the particle diameter is larger by 37 μm. There was no significant difference in brightness depending on the visual recognition level.

  5 and FIG. 6 are different from FIG. 5 in that the film of FIG. 6 is thinner by 10 μm and the particle diameter is smaller by 17.2 μm. There was a large difference in brightness depending on the visual recognition level. 6 and FIG. 7 are different from FIG. 6 in that the particle size of FIG. 7 is smaller by 4 μm and the content rate is 2% higher than that of FIG. There was a large difference in brightness depending on the visual recognition level.

  Summarizing the above, even in the case of visual recognition, it was confirmed that the light transmittance was reduced when the particle size of the burned plant was small, as in the case of measurement using a spectrophotometer. However, a decrease in light transmittance could not be confirmed with a difference in content of about 0.5% or a difference in film thickness of the heat-dissipating film of about 10 μm.

  The heat radiation paint of this embodiment is an illumination device such as an incandescent light bulb, an LED (light emitting diode) light bulb including an OLED (Organic light emitting diode), a mobile phone, a smartphone, a PDA (Personal Digital Assistant), a digital still camera, and a digital video. It can be suitably used for electronic devices including communication terminals such as cameras, television receivers, personal computers, and automobiles.

  In addition, the heating element in the present specification includes one that receives solar heat or the like and becomes hot as compared to the atmosphere. Then, the heat radiation paint of the present embodiment includes a roof material, a floor material, a wall material, or the like. It can also be suitably used as a part of work clothes as an antistatic body such as building materials, automobile bodies, windshields, and the like. Furthermore, it can be estimated that if the heat dissipating paint is applied only to the inner surface of the roof material, that is, the back surface of the solar light irradiation surface, the temperature of the inner surface of the roof material is lowered.

  The above application is an example, and the heat dissipating paint of the present embodiment is excellent in translucency, so the application target is not selected. Moreover, since the heat-dissipating paint of this embodiment has not only heat dissipation but also thermal conductivity and electromagnetic absorption characteristics, it is preferably used particularly in fields where both such characteristics and heat dissipation characteristics are required. be able to.

  However, humans usually have a high possibility of direct contact. In the above example, car bodies and work clothes should be dissipated in summer, but conversely in winter. There is little need for it. Therefore, for this type of heating element, it is desirable that the heat radiation coating can be removed in about several months. In such a case, the binder does not need to have strong adhesiveness, but rather, a binder that can be bonded for several months may be selected.

It is a typical manufacturing process figure of the soybean hull baking body which concerns on this embodiment. It is a measurement system diagram for investigating the thermal radiation effect of the thermal radiation paint of this embodiment. It is a microscope picture, such as sample A. It is a microscope picture, such as sample A. It is a microscope picture, such as sample A. It is a microscope picture, such as sample A. It is a microscope picture, such as sample A. It is a microscope picture, such as sample A.

DESCRIPTION OF SYMBOLS 10 Resistor 20 Thermal conductive double-sided tape 30 Heat sink 40 Heat sink film 100 Windshield case

Claims (7)

In the heat dissipating paint containing heat dissipating filler to the binder,
Using a translucent resin as the binder,
Using a plant fired body having a particle size of 2.4 μm to 60 μm fired at a firing temperature ranging from 900 ° C. to a temperature at which it does not graphitize as the heat dissipating filler,
A heat-radiating paint having translucency, containing the plant fired body in an amount of 0.5% to 5.0% with respect to the resin.   The heat dissipating paint according to claim 1, wherein at least one of the firing temperature and the particle size of the plant fired body is controlled.   The heat-dissipating paint according to claim 1, wherein the fired body is a fired body of rice bran, rice husk, soybean hull, rapeseed meal, sesame meal, cottonseed meal, cotton hull, soybean hull, or cacao husk.   The heat radiation paint according to claim 1, wherein the resin has a heat radiation effect.   The heat generating body with which the heat-radiation film formed with the heat-radiation coating material of Claim 1 was apply | coated on the conditions used as the film thickness of 10 micrometers-40 micrometers. A plant fired body used for the heat radiation paint according to claim 1,
Rice bran, rice hulls, soybean hulls, rapeseed meal, sesame meal, cotton seed meal, cotton hulls, soybean hulls, and fired one of Kakaohasuku is the particle size is 30 microns to 60 [mu] m, the plant fired body.   The heat-radiating paint according to claim 1, wherein the resin has translucency and has a polar group.