WO2014073228A1 - 高熱伝導性ベーマイト及びその製造方法 - Google Patents
高熱伝導性ベーマイト及びその製造方法 Download PDFInfo
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- WO2014073228A1 WO2014073228A1 PCT/JP2013/062591 JP2013062591W WO2014073228A1 WO 2014073228 A1 WO2014073228 A1 WO 2014073228A1 JP 2013062591 W JP2013062591 W JP 2013062591W WO 2014073228 A1 WO2014073228 A1 WO 2014073228A1
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- boehmite
- thermal conductivity
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- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01F—COMPOUNDS OF THE METALS BERYLLIUM, MAGNESIUM, ALUMINIUM, CALCIUM, STRONTIUM, BARIUM, RADIUM, THORIUM, OR OF THE RARE-EARTH METALS
- C01F7/00—Compounds of aluminium
- C01F7/02—Aluminium oxide; Aluminium hydroxide; Aluminates
- C01F7/44—Dehydration of aluminium oxide or hydroxide, i.e. all conversions of one form into another involving a loss of water
- C01F7/441—Dehydration of aluminium oxide or hydroxide, i.e. all conversions of one form into another involving a loss of water by calcination
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- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09K—MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE
- C09K5/00—Heat-transfer, heat-exchange or heat-storage materials, e.g. refrigerants; Materials for the production of heat or cold by chemical reactions other than by combustion
- C09K5/08—Materials not undergoing a change of physical state when used
- C09K5/14—Solid materials, e.g. powdery or granular
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- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01P—INDEXING SCHEME RELATING TO STRUCTURAL AND PHYSICAL ASPECTS OF SOLID INORGANIC COMPOUNDS
- C01P2006/00—Physical properties of inorganic compounds
- C01P2006/12—Surface area
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- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01P—INDEXING SCHEME RELATING TO STRUCTURAL AND PHYSICAL ASPECTS OF SOLID INORGANIC COMPOUNDS
- C01P2006/00—Physical properties of inorganic compounds
- C01P2006/32—Thermal properties
Definitions
- the present invention relates to boehmite with improved thermal conductivity and a method for producing the boehmite.
- thermally conductive inorganic fillers include metal powder (silver, copper, aluminum, etc.), nitride (aluminum nitride, boron nitride, silicon nitride, etc.), carbide (silicon carbide, etc.), ⁇ -alumina, silica, etc.
- metal powder silver, copper, aluminum, etc.
- nitride aluminum nitride, boron nitride, silicon nitride, etc.
- carbide silicon carbide, etc.
- ⁇ -alumina silica, etc.
- boehmite is an inorganic filler that has been widely used as a flame retardant, a reinforcing material, and a bright material. Boehmite is particularly inexpensive as compared with other inorganic fillers as shown in FIG. 1, and is excellent in terms of insulation, weight, hardness, and flame retardancy.
- the specific surface area is reduced or the aspect ratio is lowered to increase the filling property so that the electronic component can be highly filled, or the aspect ratio is increased to increase the thermal conductivity path. It is also excellent in that the thermal conductivity can be increased by creating a (heat path) and the same filling amount. Therefore, boehmite is extremely useful if it can be used as a thermally conductive inorganic filler.
- boehmite since the heat conductivity of boehmite is inferior to that of other inorganic fillers, its use as a heat conductive inorganic filler that dissipates heat has been limited.
- the present invention has been made in view of the above circumstances, and provides a highly thermally conductive boehmite that has the flame retardancy and high filling properties of boehmite and has improved thermal conductivity, and a method for producing highly thermally conductive boehmite. This is the issue.
- the present invention is a high thermal conductivity boehmite characterized in that the thermal conductivity derived from the following formula 1 is 11.0 W / m ⁇ K or more.
- Vf Boehmite volume filling rate
- ⁇ c Thermal conductivity of the complex of boehmite and resin (W / m ⁇ K)
- ⁇ f Thermal conductivity of boehmite (W / m ⁇ K)
- ⁇ m Resin Thermal conductivity (W / m ⁇ K)
- n form factor of filler particles proposed by Hamilton and Crosser
- ⁇ value obtained by dividing the surface area of a sphere having a volume equal to the boehmite particle volume by the actual particle surface area
- ⁇ Power
- the above formula 1 is called the Kanari formula and is a formula used to analyze the thermal conductivity of a composite material such as a polymer material containing a filler (Katsuhiko Kanari: thermal conductivity of a composite system). , Polymer, Vol. 26, No. 8, pp. 557-561, 1977).
- the gist of the present invention is high heat conductive boehmite characterized in that the dehydration amount at 700 ° C. is 14.0% to 15.7%.
- the amount of dehydration at 700 ° C. is the percentage of mass that is decreased when the temperature is increased to 700 ° C. with the amount of dehydration at 100 ° C. being 0%.
- the gist of the present invention is a method for producing highly thermally conductive boehmite, characterized in that boehmite is heat-treated at 320 ° C. to 430 ° C.
- boehmite may be heat-treated in a pressurized atmosphere. Boehmite may be heat-treated with superheated steam.
- the high thermal conductivity boehmite of the present invention has the characteristics of boehmite and has improved thermal conductivity, it is not only excellent in terms of cost, insulation, weight, and hardness, but also flame retardancy, which is a characteristic of boehmite, A thermally conductive inorganic filler having a high filling property can be provided.
- FIG. 4 is a table showing a plot of measured values of rate ⁇ c, a graph (“Vf ⁇ c” curve closest to the plot) created based on Equation 1, and measured values and calculated values.
- the untreated boehmite and the high thermal conductivity boehmite in the drawings indicate a composite with a resin blended with the untreated boehmite and a complex with a resin blended with the high thermal conductivity boehmite, respectively.
- a graph created based on Equation (1) and a graph (“Vf ⁇ c” curve closest to the plot) as well as measured values and calculated values.
- the untreated boehmite and the high thermal conductivity boehmite in the drawings indicate a composite with a resin blended with the untreated boehmite and a complex with a resin blended with the high thermal conductivity boehmite, respectively.
- a graph created based on Equation (1) and a graph (“Vf ⁇ c” curve closest to the plot) as well as measured values and calculated values.
- the untreated boehmite and the high thermal conductivity boehmite in the drawings indicate a composite with a resin blended with the untreated boehmite and a complex with a resin blended with the high thermal conductivity boehmite, respectively.
- a graph created based on Equation (1) and a graph (“Vf ⁇ c” curve closest to the plot) as well as measured values and calculated values.
- the untreated boehmite and the high thermal conductivity boehmite in the drawings indicate a composite with a resin blended with the untreated boehmite and a complex with a resin blended with the high thermal conductivity boehmite, respectively.
- a graph created based on Equation (1) and a graph (“Vf ⁇ c” curve closest to the plot) as well as measured values and calculated values.
- the untreated boehmite and the high thermal conductivity boehmite in the drawings indicate a composite with a resin blended with the untreated boehmite and a complex with a resin blended with the high thermal conductivity boehmite, respectively.
- the high thermal conductivity boehmite of the present invention can be produced by heat treating boehmite at a predetermined temperature.
- the boehmite used as a raw material is a boehmite production method (for example, boehmite synthesized hydrothermally from aluminum hydroxide, boehmite synthesized hydrothermally by adding additives to aluminum hydroxide, boehmite precursor synthesized from various aluminum salts and aluminum alkoxides).
- Boehmite synthesized from the body boehmite hydrated by hydrothermal treatment of transition alumina, boehmite synthesized from aluminum dawsonite, natural boehmite), boehmite shape (for example, flat boehmite, acicular boehmite, scaly boehmite , Cubic boehmite, discoid boehmite, aggregate boehmite), the size of the primary particles of boehmite, and the like, and any boehmite can be used.
- Boehmite is a monohydrate of alumina and is dehydrated by the following reaction, and the theoretical amount of dehydration is 15%. 2AlOOH ⁇ Al 2 O 3 + H 2 O A dehydration amount larger or smaller than the theoretical value indicates that impurities are included. As the dehydration amount becomes lower than the theoretical value of 15%, ⁇ -alumina is contained. Moreover, aluminum hydroxide and pseudo-boehmite are contained as the dehydration amount becomes higher than the theoretical value of 15%. Therefore, the amount of dehydration at 700 ° C. is preferably 14.0% to 15.7%, and more preferably 14.5% to 15.2%. This is because if the 700 ° C. dehydration amount is lower than 14.0%, the thermal conductivity is lowered due to the formation of ⁇ -alumina, and if it is higher than 15.7%, the thermal conductivity is decreased due to the generation of pseudoboehmite.
- the specific surface area of the high thermal conductive boehmite is preferably 95% to 1114%, more preferably 100% to 110% of the specific surface area of the raw boehmite.
- the specific surface area is hardly reduced by the heat treatment, if it is less than 95%, it is suggested that crystal growth proceeds and the crystal shape is broken, which is not preferable.
- it exceeds 114% it is suggested that ⁇ -alumina is formed, which is not preferable because not only the thermal conductivity but also the flame retardancy and filling properties are lowered.
- the heat treatment of the raw material boehmite is preferably performed under pressure. Furthermore, it is more preferable to carry out under pressure containing water vapor. It is because the production of ⁇ -alumina due to dehydration of boehmite can be suppressed by heating under pressure and under pressure containing water vapor.
- the pressure is preferably greater than atmospheric pressure and 2 MPa or less. If the pressure exceeds 2 MPa, the pressure-resistant equipment for treatment becomes expensive, but the effect of suppressing the formation of ⁇ -alumina cannot be expected, which is uneconomical.
- the heat treatment of the raw boehmite is preferably performed with superheated steam. This is because the production of ⁇ -alumina due to the dehydration of boehmite can be suppressed by heating with superheated steam.
- the heating temperature for producing the high thermal conductivity boehmite is preferably 320 ° C. to 430 ° C., more preferably 350 ° C. to 400 ° C. This is because if the heating temperature is lower than 320 ° C., the thermal conductivity of the raw boehmite cannot be sufficiently increased, and if it is higher than 430 ° C., the raw boehmite tends to change to ⁇ -alumina having a low thermal conductivity. .
- the heating temperature of 320 ° C. to 430 ° C. is the temperature of the raw material boehmite itself to be heated, and the heating temperature of the heating device may exceed this temperature range.
- the temperature of the heating device can be set to about 800 ° C. to 1000 ° C., and the raw boehmite itself can be heated to a temperature of 320 ° C. to 430 ° C. in a short time of about several seconds.
- the heat treatment method is not particularly limited as long as heat treatment can be performed at a predetermined temperature, and a stationary type method such as a shelf dryer, an electric furnace, a stirring blade type, a paddle mixer type, a rotating drum type, and a stirring type such as a rotary type. Examples thereof include a fluidized bed method, a spray method, a spray method, and a free-fall method such as in a heating tube.
- the heating source is not particularly limited as long as it can be heated to a predetermined temperature, and examples thereof include a heating electric heater, a gas burner, hot air, microwaves, and induction heating.
- the heating time varies depending on the above heat treatment method, and is not particularly limited.
- the stirring method since the heating efficiency is good, the heating time may be short.
- the spray type since the processing amount per unit time is small, it can be processed in a shorter time. Even with the same heat treatment method, if the heating time is lengthened, the thermal conductivity is improved, but if it is too long, ⁇ -alumina is produced, which is not preferable.
- the stationary method can be exemplified by 3 hours / 350 ° C., but it is usually from 320 ° C. to 430 ° C. for 2 to 10 hours.
- 0.5 hours / 350 ° C. can be exemplified for the stirring type, and several seconds / 400 ° C. can be exemplified for the spray type method.
- the resin in which the high thermal conductivity boehmite is blended is not particularly limited, and polyamide such as epoxy resin, silicone resin, melamine resin, urea resin, phenol resin, unsaturated polyester, fluororesin, polyimide, polyamideimide, polyetherimide, Polybutylene terephthalate, polyester such as polyethylene terephthalate, polyphenylene sulfide, wholly aromatic polyester, liquid crystal polymer, polysulfone, polyethersulfone, polycarbonate, maleimide modified resin, ABS resin, acrylonitrile-acrylic rubber / styrene resin, acrylonitrile / ethylene / propylene / Examples include general-purpose resins such as diene rubber-styrene resin, polyethylene, polypropylene, polyvinyl chloride, and polystyrene.
- polyamide such as epoxy resin, silicone resin, melamine resin, urea resin, phenol resin, unsaturated polyester, fluororesin, polyimi
- Boehmite 1 shown in Table 6 was used as the raw material boehmite of Examples and Comparative Examples shown in Table 1.
- boehmite as a raw material was heat-treated at a predetermined temperature for a predetermined time using a static electric furnace to produce the high thermal conductivity boehmite of the present invention shown in Table 1 and blended with a resin.
- untreated boehmite that was not heat-treated was added to the resin.
- Comparative Examples 3, 5, 8, and 11 the raw boehmite was heat-treated at 450 ° C.
- ⁇ -aluminated high heat partially heat treated boehmite
- Conductive boehmite was blended into the resin.
- the raw boehmite was heat-treated at 1250 ° C. for a predetermined time using a static electric furnace, and the obtained ⁇ -alumina was blended with the resin.
- the resin was blended with high thermal conductivity boehmite, untreated boehmite, ⁇ -aluminated high thermal conductivity boehmite and ⁇ -alumina, and then the thermal conductivity of the resin was measured.
- Examples are high thermal conductivity boehmite, Comparative Examples 1, 2, 4, 7, and 10 are untreated boehmite, Comparative Examples 3, 5, 8, and 11 are ⁇ -aluminated high thermal conductivity boehmite, Comparative Example 6,
- ⁇ -alumina was weighed in 40 g of epoxy resin (DER-331J manufactured by Dow Chemical Co., Ltd.), and the proportions corresponding to the volume filling ratios shown in Table 1 were weighed and placed in a container. -310), the mixture was stirred and mixed at a revolution of 2000 rpm and a rotation of 1200 rpm for 2 minutes.
- “Filler Properties” column shows the 700 ° C. dehydration amount and specific surface area of each of high thermal conductivity boehmite, untreated boehmite, ⁇ -aluminated high thermal conductivity boehmite and ⁇ -alumina.
- the 700 ° C. dehydration amount was measured by thermogravimetry using a thermal analyzer (manufactured by Bruker AXS).
- the specific surface area was measured using an automatic specific surface area / pore distribution measuring device (BELSORPmini manufactured by Nippon Bell Co., Ltd.) and determined by analysis by the BET method.
- the thermal conductivity of the example in which the high thermal conductivity boehmite was blended with the resin was higher than that of the comparative example in which the untreated boehmite was blended with the resin. Further, the 700 ° C. dehydration amount of the high thermal conductive boehmite in the examples was in the range of 14.4% to 14.9%.
- the thermal conductivity of the comparative example in which ⁇ -aluminated high thermal conductivity boehmite was blended with the resin was lower than that of the example.
- the thermal conductivity of the comparative example in which ⁇ -alumina was blended with the resin was higher than that of the example.
- ⁇ -alumina has a high thermal conductivity, it is necessary to heat the raw material boehmite at a high temperature exceeding 1000 ° C. for a predetermined time. Therefore, ⁇ -alumina is more expensive than high heat conductive boehmite, and is not a hydrate. Not flammable.
- ⁇ -aluminated high thermal conductivity boehmite of Comparative Examples 3, 5, 8, and 11 since most of the raw material boehmite is changed to ⁇ -alumina that is not hydrated, the amount of dehydration at 700 ° C. compared to untreated boehmite Had fallen.
- the ⁇ -alumina of Comparative Examples 6, 9, and 12 had a 700 ° C.
- the specific surface area of the high thermal conductivity boehmite of the example was not different from the specific surface area of the untreated boehmite of the comparative example, and the raw boehmite was hardly converted to ⁇ -alumina or pseudoboehmite.
- the specific surface area of the high thermal conductivity boehmite of the example was not different from the specific surface area of the untreated boehmite of the comparative example, and the raw boehmite was hardly converted to ⁇ -alumina or pseudoboehmite.
- the thermal conductivity of the example was higher than that of the comparative example.
- the 700 ° C. dehydration amount of the high thermal conductive boehmite in the examples was in the range of 14.0% to 15.2%.
- the specific surface area of the high thermal conductivity boehmite of Example 22 was 95% of the specific surface area of the untreated boehmite of Comparative Example 22, but there was no difference in the other Examples, and the raw boehmite was almost ⁇ -aluminated or formed. It was not pseudo boehmite. Although no particular data was shown, even when boehmite synthesized by hydrating transition alumina was used as a raw material, the heat conductivity was improved by heat treatment, and it was possible to use it as a highly heat conductive boehmite.
- Boehmite 1 shown in Table 6 was used as the raw material boehmite in Examples and Comparative Examples shown in Table 4.
- the raw boehmite was heat-treated at a predetermined temperature for a predetermined time to produce the high thermal conductivity boehmite according to the present invention shown in Table 4 and blended with the resin.
- the heat treatment method was carried out by pressure heat treatment, superheated steam treatment and small amount of heating instead of the method using a static electric furnace in the production (1) to (3) of high thermal conductive boehmite.
- the pressure in Example 24 was 0.5 MPa.
- Comparative Example 24 raw boehmite that was not heat-treated was added to the resin.
- the thermal conductivity of the example was higher than that of the comparative example even if the heat treatment method was different.
- the 700 ° C. dehydration amount of the high thermal conductivity boehmite in the examples was in the range of 14.8% to 15.5%.
- the specific surface area of the high thermal conductivity boehmite of the example was not different from the specific surface area of the untreated boehmite of the comparative example, and the raw boehmite was hardly converted to ⁇ -alumina or pseudoboehmite.
- the raw material boehmite of Examples 27 to 29 and Comparative Examples 25 to 27 shown in Table 5 is the same as the raw material of Examples 30 to 32 and Comparative Examples 28 to 30.
- the boehmite of Table 6 is the boehmite 6 shown in Table 6, the boehmite of the raw materials of Examples 33 to 35 and Comparative Examples 31 to 33 is the boehmite 3 shown in Table 6, and Examples 36 to 38 and Boehmite 2 shown in Table 6 was used as the raw material boehmite of Examples 34 to 36.
- the raw boehmite was heat-treated at a predetermined temperature for a predetermined time using a static electric furnace to produce the high thermal conductivity boehmite of the present invention shown in Table 5 and blended with the resin.
- raw boehmite that was not heat-treated was added to the resin.
- Formulation of high thermal conductivity boehmite and untreated boehmite into resin (the blending amount of high thermal conductivity boehmite and untreated boehmite is the ratio of volume filling rate shown in Table 5), measurement of thermal conductivity, 700 ° C dehydration amount And the measurement of the specific surface area were performed in the same manner as in the production (1) of high thermal conductivity boehmite.
- the thermal conductivity of the Examples was higher than that of the Comparative Examples. Further, the 700 ° C. dehydration amount of the high thermal conductivity boehmite in the examples was in the range of 14.5% to 15.5%.
- the specific surface area of the high thermal conductivity boehmite of the example was not different from the specific surface area of the untreated boehmite of the comparative example, and the raw boehmite was hardly converted to ⁇ -alumina or pseudoboehmite.
- the thermal conductivities of the high thermal conductivity boehmite and untreated boehmite in Comparative Example 36 were derived using Equation 1. The following numerical values were used to derive the thermal conductivity.
- Vf volume filling rate of boehmite: volume filling rate shown in Table 5 ⁇ c (thermal conductivity of complex of boehmite and resin): thermal conductivity shown in Table 5 ⁇ m (thermal conductivity of resin): 0.24 W / m ⁇ K Boehmite in Examples 1, 4, 5, 7 and Comparative Examples Comparative Examples 1, 2, 4, 7, 10 ⁇ : 0.795 ⁇ of boehmite of Examples 27 to 29 and Comparative Examples 25 to 27: 0.754 ⁇ of boehmite of Examples 30 to 32 and Comparative Examples 28 to 30: 0.708 Boehmite ⁇ : 0.362 of Examples 33 to 35 and Comparative Examples 31 to 33 Boehmite ⁇ : 0.665 of Examples 36 to 38 and Comparative Examples 34 to 36
- the boehmite maintains a predetermined shape up to about 1300 ° C., there is no change in the predetermined shape by heating at 320 ° C. to 430 ° C. There is no difference.
- Vf Vol% on the horizontal axis and ⁇ c on the vertical axis
- Vf and ⁇ c in Table 5 were plotted on the graph.
- the “Vf ⁇ c” curve obtained by substituting the above numerical value (n is a numerical value obtained by 3 ⁇ ⁇ ) and the thermal conductivity ⁇ f of an arbitrary boehmite into Equation 1 is superimposed on the graph, and “Vf ⁇ The “Vf- ⁇ c” curve closest to the plot is selected from the “ ⁇ c” curves, and the value of ⁇ f substituted to obtain the “Vf- ⁇ c” curve is set to the high thermal conductivity boehmite of the example and the untreated sample of the comparative example Derived as the thermal conductivity of boehmite.
- the calculated values shown in each figure obtained from the “Vf ⁇ c” curve closest to the plot and the measured values are in good agreement, and the thermal conductivity of the high thermal conductivity boehmite of the example and the thermal conductivity of the untreated boehmite of the comparative example
- the thermal conductivity of the high thermal conductivity boehmite was about 2.4 to 3.3 times higher than that of the untreated boehmite of the comparative example.
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Abstract
Description
従来、電子基板は、成形性の良さや安価であることから、樹脂基板が使われてきたが、樹脂は熱伝導性が低いため、熱伝導が必要な電子基板には、金属基板やセラミックス基板が利用されることがある。しかし、金属基板は電導性があるため直接電子部品を搭載できない上に重いことや高価であること等の問題があり、また、セラミックス基板は複雑な形状を作ることが困難である上に高価である問題があるため、やはり樹脂基板を利用することが好ましいとされていた。
そこで、樹脂基板の熱伝導性を向上させ、熱を放散させる方法として、熱伝導性の無機フィラーを電子基板や電子部品を構成する樹脂に充填する方法がある(特許文献1、特許文献2参照)。
一方、従来、難燃剤、補強材、光輝材等として広く用いられている無機フィラーにベーマイトがある。ベーマイトは、図1に示すように他の無機フィラーに比べ特に安価であり、また、絶縁性、重さ、硬さ、難燃性の点でも優れている。さらに、結晶形状を制御した合成が容易であるため、比表面積を小さくしたりアスペクト比を低くして電子部品に高充填できるように充填性を高めたり、アスペクト比を高くして熱電導性パス(熱の通り道)を作り同じ充填量でも熱電導性を高くすることができる点でも優れている。したがって、ベーマイトは、熱伝導性の無機フィラーとして使用できれば極めて有用である。
数式1におけるベーマイトの体積充填率(Vf)は、以下のように求められる。
Vf=A÷(A+B)(A:樹脂に配合されるベーマイトの質量を比重で除した値、B:樹脂の質量を比重で除した値)
なお、表1~表5及び図2~図6のVfは、vol%で表示した。
数式1におけるΨは、以下のように求められる。
Ψ = {(9πz)^(1/3)} / {z+(8)^(1/2)}
z:ベーマイトのアスペクト比
2AlOOH→Al2O3+H2O
脱水量が理論値より大小することは不純物を含むことを示す。脱水量が15%の理論値より低くなるほどγ-アルミナを含有する。また、脱水量が15%の理論値より高くなるほど水酸化アルミニウムや擬ベーマイトを含有する。そのため、700℃脱水量は、14.0%~15.7%が好ましく、14.5%~15.2%がより好ましい。700℃脱水量が14.0%より低いとγ-アルミナの生成により熱伝導性を低下させるからであり、15.7%より高いと擬ベーマイトの生成により熱伝導性を低下させるからである。
表1に示す実施例及び比較例の原料のベーマイトは、表6に示すベーマイト1を用いた。実施例1~実施例8は、原料のベーマイトを静置電気炉を用いて所定温度で所定時間加熱処理し、表1に示す本発明の高熱伝導性ベーマイトを製造し樹脂に配合した。比較例1、2、4、7、10は、原料のベーマイトを加熱処理しない未処理のベーマイトを樹脂に配合した。比較例3、5、8、11は、原料のベーマイトを静置電気炉を用いて450℃で加熱処理し、一部がγ-アルミナ化した高熱伝導性ベーマイト(以下、「γ-アルミナ化高熱伝導性ベーマイト」という)を樹脂に配合した。比較例6、9、12は、原料のベーマイトを静置電気炉を用いて1250℃で所定時間加熱処理し、得られたα-アルミナを樹脂に配合した。樹脂に高熱伝導性ベーマイト、未処理ベーマイト、γ-アルミナ化高熱伝導性ベーマイト及びα-アルミナをそれぞれを配合した後、樹脂の熱伝導率を測定した。
そこへ開始剤の2-エチル4-メチルイミダゾール(和光純薬社製)を0.8g(エポキシ樹脂に対して2wt%)添加した後、遊星撹拌機を用いて公転2000rpm・自転1200rpmで2分間混合し、さらに脱泡処理運転を2分間行った。その後、真空脱泡処理し、120℃で2時間加熱硬化させ、実施例及び比較例の熱伝導率測定用試験試料を得た。得られた熱伝導率測定用試験試料を40mm×40mm×20mmの試験片として切り出し、25℃の恒温槽で2時間以上保持した。その後、試験片を迅速熱伝導計(京都電子工業社製QTM-500)を使用し、樹脂の熱伝導係率を測定した。また、表1の「フィラーの特性」欄に高熱伝導性ベーマイト、未処理ベーマイト、γ-アルミナ化高熱伝導性ベーマイト及びα-アルミナのそれぞれについての700℃脱水量及び比表面積を示した。なお、700℃脱水量は、熱分析装置(ブルカーエイエックスエス社製)を用いて熱重量測定により行った。また、比表面積は、自動比表面積/細孔分布測定装置(日本ベル社製BELSORPmini)を用いて測定し、BET法による解析にて求めた。
表2に示す実施例9~実施例13及び比較例13~比較例18の原料のベーマイトは、表6に示すベーマイト3を、実施例14~実施例19及び比較例19の原料のベーマイトは、表6に示すベーマイト4をそれぞれ用いた。実施例9~実施例19は、原料のベーマイトを静置電気炉を用いて所定温度で所定時間加熱処理し、表2に示す本発明の高熱伝導性ベーマイトを製造し樹脂に配合した。比較例14~比較例18は、280℃又は300℃で所定時間加熱処理した加熱処理ベーマイトを樹脂に配合した。比較例13及び比較例19は、原料のベーマイトを加熱処理しない未処理のベーマイトを樹脂に配合した。高熱伝導性ベーマイト、加熱処理ベーマイト及び未処理ベーマイトの樹脂への配合(高熱伝導性ベーマイト、加熱処理ベーマイト及び未処理ベーマイトの配合量は表2に示す体積充填率になる割合とした)、熱伝導率の測定、700℃脱水量の測定及び比表面積の測定は、高熱伝導性ベーマイトの製造(1)と同様に行った。
表3に示す実施例20、21及び比較例20、21の原料のベーマイトは、表6に示すベーマイト8を、実施例22及び比較例22の原料のベーマイトは、表6に示すベーマイト9を、実施例23及び比較例23の原料のベーマイトは、表6に示すベーマイト5をそれぞれ用いた。実施例20~実施例23は、原料のベーマイトを静置電気炉を用いて所定温度で所定時間加熱処理し、表3に示す本発明の高熱伝導性ベーマイトを製造し樹脂に配合した。比較例20~比較例23は、原料のベーマイトを加熱処理しない未処理のベーマイトを樹脂に配合した。高熱伝導性ベーマイト及び未処理ベーマイトの樹脂への配合(高熱伝導性ベーマイト及び未処理ベーマイトの配合量は表3に示す体積充填率になる割合とした)、熱伝導率の測定、700℃脱水量の測定及び比表面積の測定は、高熱伝導性ベーマイトの製造(1)と同様に行った。
表4に示す実施例及び比較例の原料のベーマイトは、表6に示すベーマイト1を用いた。実施例24~実施例26は、原料のベーマイトを所定温度で所定時間加熱処理し、表4に示す本発明に係る高熱伝導性ベーマイトを製造し樹脂に配合した。加熱処理の方法は、高熱伝導性ベーマイトの製造(1)~(3)の静置電気炉による方法に代え、加圧加熱処理、過熱水蒸気処理及び少量加熱で行った。なお、実施例24の圧力は、0.5MPaとした。比較例24は、原料のベーマイトを加熱処理しない未処理のベーマイトを樹脂に配合した。高熱伝導性ベーマイト及び未処理ベーマイトの樹脂への配合(高熱伝導性ベーマイト及び未処理ベーマイトの配合量は表4に示す体積充填率になる割合とした)、熱伝導率の測定、700℃脱水量の測定及び比表面積の測定は、高熱伝導性ベーマイトの製造(1)と同様に行った。なお、少量加熱は、内容積7.5Lの電気炉(いすゞ製作所社製SSTS-25R)を1000℃に加熱しておき、この電気炉へ金属製シャーレに厚さ1.5mm以下で薄く広げた原料ベーマイト1gを入れ、5秒後に取り出す方法により行った。この方法による加熱処理直後の原料ベーマイトの温度は、390℃であった。
表5に示す実施例27~実施例29及び比較例25~比較例27の原料のベーマイトは、表6に示すベーマイト7を、実施例30~実施例32及び比較例28~比較例30の原料のベーマイトは、表6に示すベーマイト6を、実施例33~実施例35及び比較例31~比較例33の原料のベーマイトは、表6に示すベーマイト3を、実施例36~実施例38及び比較例34~比較例36の原料のベーマイトは、表6に示すベーマイト2をそれぞれ用いた。実施例27~実施例38は、原料のベーマイトを静置電気炉を用いて所定温度で所定時間加熱処理し、表5に示す本発明の高熱伝導性ベーマイトを製造し樹脂に配合した。比較例25~比較例36は、原料のベーマイトを加熱処理しない未処理のベーマイトを樹脂に配合した。高熱伝導性ベーマイト及び未処理ベーマイトの樹脂への配合(高熱伝導性ベーマイト及び未処理ベーマイトの配合量は表5に示す体積充填率になる割合とした)、熱伝導率の測定、700℃脱水量の測定及び比表面積の測定は、高熱伝導性ベーマイトの製造(1)と同様に行った。
熱伝導率の導出は、以下の数値を用いた。
Vf(ベーマイトの体積充填率):表5に示す体積充填率
λc(ベーマイトと樹脂の複合体の熱伝導率):表5に示す熱伝導率
λm(樹脂の熱伝導率):0.24W/m・K
実施例1、4、5、7及び比較例比較例1、2、4、7、10のベーマイトのΨ:0.795
実施例27~実施例29及び比較例25~比較例27のベーマイトのΨ:0.754
実施例30~実施例32及び比較例28~比較例30のベーマイトのΨ:0.708
実施例33~実施例35及び比較例31~比較例33のベーマイトのΨ:0.362
実施例36~実施例38及び比較例34~比較例36のベーマイトのΨ:0.665
なお、ベーマイトは約1300℃まで所定の形状を維持するため、320℃~430℃での加熱では所定の形状に変化はなく、本発明の高熱伝導性ベーマイトのΨは、原料のベーマイトのΨと差違がない。
実施例1、4、5、7:11.0W/m・K
比較例1、2、4、7、10:4.5W/m・K
実施例27~実施例29:12.0W/m・K
比較例25~比較例27:4.2W/m・K
実施例30~比較例32:13.0W/m・K
比較例28~比較例30:4.5W/m・K
実施例33~比較例35:17.0W/m・K
比較例31~比較例33:5.1W/m・K
実施例36~実施例38:18.0W/m・K
比較例34~比較例36:5.5W/m・K
Claims (5)
- 700℃脱水量が14.0%~15.7%であることを特徴とする高熱伝導性ベーマイト。
- ベーマイトを320℃~430℃で加熱処理することを特徴とする高熱伝導性ベーマイトの製造方法。
- ベーマイトを加圧雰囲気で加熱処理することを特徴とする請求項3に記載の高熱伝導性ベーマイトの製造方法。
- ベーマイトを過熱水蒸気で加熱処理することを特徴とする請求項3に記載の高熱伝導性ベーマイトの製造方法。
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KR1020157011881A KR102085126B1 (ko) | 2012-11-06 | 2013-04-30 | 고열전도성 베마이트 및 그 제조 방법 |
US14/440,280 US20150299551A1 (en) | 2012-11-06 | 2013-04-30 | High thermal conductive boehmite and method for manufacturing same |
CN201380056665.8A CN104837773A (zh) | 2012-11-06 | 2013-04-30 | 高导热性勃姆石及其制造方法 |
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