WO2022014402A1 - Matériau d'absorption et décharge d'énergie - Google Patents

Matériau d'absorption et décharge d'énergie Download PDF

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Publication number
WO2022014402A1
WO2022014402A1 PCT/JP2021/025431 JP2021025431W WO2022014402A1 WO 2022014402 A1 WO2022014402 A1 WO 2022014402A1 JP 2021025431 W JP2021025431 W JP 2021025431W WO 2022014402 A1 WO2022014402 A1 WO 2022014402A1
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surface area
specific surface
energy absorbing
titanium
resin
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PCT/JP2021/025431
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English (en)
Japanese (ja)
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裕司 堤
啓宏 植村
彰弘 家門
晃代 小澤
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堺化学工業株式会社
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Priority to JP2022536274A priority Critical patent/JPWO2022014402A1/ja
Publication of WO2022014402A1 publication Critical patent/WO2022014402A1/fr

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    • C—CHEMISTRY; METALLURGY
    • C01—INORGANIC CHEMISTRY
    • C01G—COMPOUNDS CONTAINING METALS NOT COVERED BY SUBCLASSES C01D OR C01F
    • C01G23/00—Compounds of titanium
    • C01G23/04—Oxides; Hydroxides
    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05K—PRINTED CIRCUITS; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS
    • H05K9/00—Screening of apparatus or components against electric or magnetic fields

Definitions

  • the present invention relates to an energy absorbing / releasing material.
  • Patent Documents 1 and 2 A technique for blocking unnecessary electromagnetic waves by kneading with various resins and fibers and absorbing electromagnetic waves (see Patent Documents 1 and 2) has been reported. Further, a temperature adjusting material (see Patent Documents 3 to 5) capable of heating foodstuffs in an electromagnetic microwave oven to a uniform temperature by using a material having an electromagnetic wave absorbing ability has been reported.
  • an electromagnetic wave absorber has been proposed as a method for preventing adverse effects on the human body and equipment due to electromagnetic waves, and a method for controlling the temperature by utilizing the properties of the electromagnetic wave absorber has been proposed.
  • Some carbon may ignite by absorbing excessive electromagnetic waves, or may deteriorate the properties of surrounding resins and fiber materials due to excessive heat generation and heat storage.
  • Iron oxide which is a magnetic electromagnetic wave absorber, has a GHz band. In, the electromagnetic wave absorption capacity is insufficient because the relative magnetic permeability is lowered. As described above, none of the conventional electromagnetic wave absorbers is sufficient in terms of performance.
  • the electromagnetic wave absorber may be used by kneading it with a resin or fiber material, and when the electromagnetic wave absorber is kneaded with a resin or fiber material for the purpose of blocking electromagnetic waves or adjusting the temperature, a large amount of the electromagnetic wave absorber is used.
  • the properties of the resin, fiber material, etc. may change, and various properties may deteriorate. Therefore, there is a demand for a material having a high electromagnetic wave absorbing ability, which exhibits sufficient electromagnetic wave absorbing ability even when used in a small amount.
  • the present inventors have studied a material having a higher electromagnetic absorption capacity than a conventional electromagnetic absorber, and the degree of aggregation of titanium borooxide particles affects the heating rate when absorbing electromagnetic waves and the heat dissipation rate after heating. Along with finding, it is represented by the composition formula of TiOx (x represents a number of 1 ⁇ x ⁇ 1.8), and is a small-sized subtitanium oxide having a specific surface area of 5 m 2 / g or more and an average particle.
  • Titanium borooxide in which the ratio of the diameter to the specific particle size in terms of specific surface area is both within a predetermined range, has a rapid temperature rise when irradiated with electromagnetic waves, has excellent ability to absorb electromagnetic waves, and also has a high rate of releasing absorbed energy as heat. It has been found that it has excellent properties as an energy absorbing / releasing material such as electromagnetic waves and heat because of its high speed.
  • Electromagnetic waves refer to radio waves having a wavelength longer than 0.1 mm and light having a wavelength shorter than 0.1 mm and longer than 10 nm.
  • Light refers to electromagnetic waves in the range of ultraviolet radiation, visible radiation, and infrared radiation.
  • the present invention is represented by a composition formula of TiOx (x represents a number of 1 ⁇ x ⁇ 1.8), has a specific surface area of 5 m 2 / g or more, and has an average particle diameter / specific surface area equivalent particle diameter. It is an energy absorbing / releasing material characterized by being made of titanium hydroxide having a surface area of 0.5 to 3.0.
  • the energy absorbing / releasing material preferably has a real part of the complex relative permittivity at a frequency of 1 GHz of 25 or more and a dielectric loss tangent of 2.6 ⁇ 10-2 or more.
  • the energy absorbed by the energy absorbing / releasing material is electromagnetic waves.
  • the present invention is also a resin material containing the energy absorbing / releasing material and the resin of the present invention.
  • the present invention is also a fiber material containing the energy absorbing / releasing material of the present invention and organic and / or inorganic fibers.
  • the present invention is also a ceramic material containing the energy absorbing / releasing material of the present invention and ceramics.
  • the energy absorbing / releasing material of the present invention has a faster heating rate when irradiated with electromagnetic waves such as radio waves and light in the GHz band than conventional titanium oxides and iron oxides, and does not ignite unlike carbon. Further, since the heat dissipation rate is high, it can be suitably used as an electromagnetic wave absorber exhibiting high electromagnetic wave absorption characteristics and a temperature control material in an environment heated by energy such as electromagnetic waves.
  • FIG. 1 It is a figure of the electron microscope observation result of titanium oxide produced in Example 1.
  • FIG. 2 It is a figure of the electron microscope observation result of titanium oxide produced in Example 2.
  • FIG. 2 It is a figure of the electron microscope observation result of titanium oxide produced in Example 3.
  • FIG. 2 It is a figure of the electron microscope observation result of titanium oxide produced in the comparative example 3.
  • FIG. 2 It is a figure of the electron microscope observation result of titanium oxide produced in the comparative example 4.
  • FIG. 1 It is a figure of the electron microscope observation result of titanium oxide produced in Example 1.
  • FIG. 2 It is a figure of the electron microscope observation result of titanium oxide produced in Example 2.
  • FIG. It is a figure of the electron microscope observation result of titanium oxide produced in Example 3.
  • FIG. It is a figure of the electron microscope observation result of titanium oxide produced in the comparative example 4.
  • the energy absorption / release material of the present invention has excellent absorption characteristics of energy that is heated by rapidly absorbing energy such as electromagnetic waves, and also has excellent heat dissipation characteristics that discharges energy as heat. It can be suitably used as a temperature control material.
  • the energy absorbing / releasing material of the present invention is represented by a composition formula of TiOx (x represents a number of 1 ⁇ x ⁇ 1.8), has a specific surface area of 5 m 2 / g or more, and has an average particle size / ratio. It is made of titanium suboxide having a surface area equivalent particle size of 0.5 to 3.0.
  • the average particle size measured by the method described in Examples described later represents the particle size of the aggregate when the particles are fused aggregates, while the specific surface area equivalent particle size is the ratio by the gas adsorption method. It is a method of obtaining the particle size by converting from the surface area measurement, and is not affected by the aggregated state due to fusion. Therefore, the ratio of the average particle size / the specific surface area conversion particle size represents the agglomerated state due to the fusion of the particles, and the larger this value is, the more the agglomeration is due to the fusion.
  • the degree of aggregation of titanium borooxide particles affects the energy absorption / release capacity, and the degree of aggregation of titanium hydride having an average particle size / specific surface area equivalent particle size of 0.5 to 3.0. If so, it is due to the fact that it has been found that the heating rate when absorbing energy such as electromagnetic waves and heat and the heat dissipation rate after heating are excellent.
  • the average particle size / specific surface area equivalent particle size of the titanium hydroxide is 0.5 to 3.0, preferably 0.6 to 2.0, and more preferably 0.8 to 1. It is 2.
  • the energy absorbing / releasing material of the present invention is made of titanium dioxide represented by the composition formula of TiOx (x represents a number of 1 ⁇ x ⁇ 1.8), where x is 1.3 ⁇ x ⁇ .
  • the number is more preferably 1.8. More preferably, the number is 1.42 ⁇ x ⁇ 1.78.
  • the value of x in the composition TiOx of the titanium dioxide powder or granular material can be calculated by the method shown in Examples described later.
  • the titanium suboxide are those specific surface area of more than 5 m 2 / g, a specific surface area of preferably not less than 8m 2 / g. More preferably, the specific surface area is 10 m 2 / g or more.
  • the specific surface area of titanium dioxide can be measured by the method shown in Examples described later.
  • the energy absorbing / releasing material of the present invention preferably has a real part of a complex relative permittivity of 25 or more at a frequency of 1 GHz and a dielectric loss tangent of 2.6 ⁇ 10-2 or more.
  • the real part of the complex relative permittivity of the energy absorbing / releasing material of the present invention at a frequency of 1 GHz is more preferably 28 or more, still more preferably 30 or more.
  • the dielectric loss tangent of the energy absorbing / releasing material of the present invention is more preferably 3.0 ⁇ 10 ⁇ 2 or more, and further preferably 5.0 ⁇ 10 ⁇ 2 or more.
  • the real part of the complex relative permittivity and the dielectric loss tangent at a frequency of 1 GHz of the energy absorbing / releasing material can be measured by the method described in Examples described later.
  • the titanium suboxide is, L * a * b * L * values in color system is 0 ⁇ L * ⁇ 50, and it is preferable b * value is b * ⁇ -2.
  • Titanium dioxide represented by the composition formula of TiOx (1 ⁇ x ⁇ 1.8) in the present invention is more excellent as an energy absorbing / releasing material when it has an L * value and a b * value in such a range. It becomes.
  • the L * value of titanium dioxide is more preferably 30 ⁇ L * ⁇ 45. More preferably, 30 ⁇ L * ⁇ 40. Further, the b * value is more preferably b * ⁇ -2.2. More preferably, b * ⁇ ⁇ 2.5.
  • the L * value and b * value of titanium dioxide can be measured by the method described in Examples described later.
  • the titanium oxide preferably has a volume resistivity of 1.0 ⁇ 10 ⁇ 2 ⁇ ⁇ cm or more.
  • a large volume resistance is advantageous in converting the energy of the absorbed electromagnetic wave into heat and releasing it.
  • the volume resistivity is more preferably not less 1.0 ⁇ 10 -1 ⁇ ⁇ cm or more, more preferably 1.0 ⁇ 10 1 ⁇ ⁇ cm greater.
  • the volume resistivity of titanium oxide can be measured by the method described in Examples described later.
  • the energy absorbing / releasing material of the present invention has excellent absorption characteristics of energy to be heated by rapidly absorbing energy such as electromagnetic waves and heat, and also has excellent heat dissipation characteristics of releasing energy as heat.
  • an electromagnetic wave absorber and a temperature control material it can be suitably used as a material for an electromagnetic wave heating catalyst.
  • the absorbed energy is an electromagnetic wave.
  • the energy absorbing / releasing material of the present invention has a high complex permittivity real part and a dielectric loss tangent, and has a high ability to store electrons. Further, the energy absorbing / releasing material of the present invention has a lower volume resistivity than the conventional titanium oxide, and has an ability to conduct electrons from the outside to the energy absorbing / releasing material of the present invention, and an ability to conduct stored electrons to the outside. Is high.
  • the energy absorbing / releasing material of the present invention is, for example, an inorganic filler used for a capacitor, a capacitor, a target material, a magnetic memory, an optical information recording medium, a charge storage type memory, a color filter, a transfer belt, an antenna substrate, and a dye increase. It can also be suitably used as a sensitive solar cell, an oxide semiconductor layer used in a perovskite solar cell, a positive electrode coating material for a secondary battery, and a pre-doped material. Further, the energy absorbing / releasing material of the present invention has a low lightness like carbon used as a black pigment and has a high ability to dissipate heat quickly. Therefore, for example, a dark blue or black low-brightness pigment, a dye or a semiconductor seal is used. It can also be suitably used as a stopper.
  • the energy absorbing / releasing material of the present invention may be used alone or in combination with other materials such as resins, organic and / or inorganic fibers, metals and ceramics.
  • the resin include bismaleimide resin, epoxy resin, polyimide resin, polysulfone resin, polyamideimide resin, polyetherimide resin, polyethersulfone resin, polybenzoimidazole resin, silicone resin, phenol resin, polyester resin, and polyvinyl ester resin.
  • Polyurethane resin, melamine resin, cyanate ester resin, isocyanate resin, polybenzoxazole resin, polyvinyl alcohol resin, modified resins thereof and the like can be used.
  • the fiber cotton, silk, linen, wool, nylon, vinylon, polyester fiber, acrylic fiber, vinylidene chloride fiber, acetate, rayon and other organic fibers; glass fiber, carbon fiber and other inorganic fibers; and the like can be used.
  • the metal include alkali metal, alkaline earth metal, rare earth, titanium group, earth acid metal, chromium group, manganese group, iron group, platinum group, copper group, zinc group, aluminum group, carbon group, nitrogen group, etc.
  • Oxygen group metals and the like can be used.
  • ceramics include metal oxides, non-oxides of metals, glass, and ceramics. The energy absorbing / releasing material of the present invention and a material using these in combination are also one of the present inventions.
  • the energy absorbing / releasing material of the present invention and the ceramic material including ceramics are both one of the present inventions.
  • the method for producing titanium hydroxide which is present and has an average particle size / specific surface area conversion particle size of 0.5 to 3.0, is not particularly limited, but a raw material containing titanium dioxide (TiO 2 ) is calcined in a reducing atmosphere. It can be manufactured by a manufacturing method including a process.
  • the crystal structure of titanium dioxide used as the raw material is not particularly limited, and any of rutile type, anatase type and brookite type can be used, and a mixture thereof may be used.
  • the titanium dioxide used as the raw material is not particularly limited, but a titanium dioxide having a specific surface area of 5 to 400 m 2 / g is preferable. By using such a material having a specific surface area, titanium oxide can be calcined more efficiently in a reducing atmosphere. More preferably, it has a specific surface area of 10 to 300 m 2 / g, and even more preferably, it has a specific surface area of 50 to 200 m 2 / g.
  • the specific surface area of titanium dioxide can be measured by the method described in Examples described later.
  • the raw material also preferably contains a reducing aid.
  • the reduction aid include metallic titanium, titanium hydride, sodium boron hydride and the like, and among them, metallic titanium and titanium hydride are preferable.
  • the content ratio of the reducing aid (the total content when two or more kinds are contained) is preferably 5 to 50 parts by weight in terms of metallic titanium with respect to 100 parts by weight of the total amount of titanium dioxide used as a raw material. Is. More preferably, it is 8 to 40 parts by weight.
  • the raw material may also contain additives that are not reducing aids.
  • additives that are not reduction aids include aggregation inhibitors, dispersants, fluxes, hygroscopic agents, oxygen absorbers, heat-generating aids, and examples of aggregation inhibitors include aluminum, silicon, zinc, and yttrium. , Zirconium, niobium, molybdenum, indium, tin, oxides of rare earths and the like can be used, and silicon dioxide is preferable.
  • a raw material mixture When a mixture consisting of two or more kinds of components (raw material mixture) is used as a raw material, a raw material mixture can be obtained by mixing each component by a usual mixing method. At that time, a dry method may be adopted. Suitable. That is, it is preferably a dry mixture. As a result, titanium dioxide represented by the composition formula of TiOx (x represents a number of 1 ⁇ x ⁇ 1.8) can be obtained more efficiently. It should be noted that each raw material component can be used alone or in combination of two or more.
  • the raw material When the raw material is fired in a reducing atmosphere (also referred to as reduction firing), the raw material may be fired as it is, or if the raw material contains a solvent, it may be fired after desolving.
  • the reducing atmosphere is not particularly limited, and is a hydrogen (H 2 ) atmosphere, a carbon monoxide (CO) atmosphere, a nitrogen (N 2 ) atmosphere, a mixed gas atmosphere of hydrogen and carbon monoxide and / or nitrogen, hydrogen and an inert gas.
  • the atmosphere of a mixed gas with and the like is mentioned, and the atmosphere of ammonia (NH 3 ) and the like is also included in this.
  • a hydrogen atmosphere or a mixed gas atmosphere of hydrogen and nitrogen is preferable because the subtitanium oxide powder can be efficiently produced.
  • the reducing atmosphere it is desirable that the reducing gas is continuously injected and flowing into the reaction field (also referred to as a system) in which the reduction is performed.
  • the raw material may be fired only once or twice or more. Even when it is performed twice or more, it is preferable that all the steps are performed in a reducing atmosphere (preferably a hydrogen atmosphere or a mixed gas atmosphere of hydrogen and nitrogen).
  • a reducing atmosphere preferably a hydrogen atmosphere or a mixed gas atmosphere of hydrogen and nitrogen.
  • the firing temperature is preferably 500 to 1100 ° C., although it depends on the conditions of the reducing atmosphere such as hydrogen concentration. Thereby, it is represented by the composition formula of TiOx (x represents a number of 1 ⁇ x ⁇ 1.8), the specific surface area is 5 m 2 / g or more, and the average particle size / specific surface area conversion particle size is 0. Titanium suboxide, which is .5-3.0, can be obtained more efficiently.
  • the firing temperature is more preferably 600 to 1050 ° C, still more preferably 700 to 1000 ° C. In the present specification, the firing temperature means the maximum temperature reached in the firing process.
  • the firing time that is, the holding time at the firing temperature, also depends on the conditions of the reducing atmosphere such as the hydrogen concentration, but is preferably 5 minutes to 100 hours, for example. When the firing time is within this range, the reaction proceeds more sufficiently and the productivity is excellent. It is more preferably 30 minutes to 48 hours, still more preferably 60 minutes to 24 hours, and particularly preferably 2 to 10 hours.
  • a gas other than hydrogen for example, nitrogen gas
  • the method for producing an energy absorbing / releasing material of the present invention may include other steps as long as it includes a step of calcining the raw material containing titanium dioxide (TiO 2) in a reducing atmosphere.
  • steps include a step of cooling the titanium dioxide after firing, a step of crushing the titanium dioxide after firing, and the like.
  • Example 1 Rutile type titanium oxide (manufactured by Sakai Chemical Industry Co., Ltd., trade name “STR-100N", specific surface area 100 m 2 / g) 15.8 g and titanium hydride (manufactured by Toho Tech Co., Ltd., trade name "Titanium hydride powder TCH-450” ) After dry mixing 1.4 g, the mixture was placed in an alumina boat, heated to 710 ° C. over 68 minutes while circulating 100 vol% hydrogen at 400 ml / min in an atmospheric firing furnace, and kept at 710 ° C. for 8 hours. Then, it was naturally cooled to room temperature to obtain Example 1 powder identified as Ti 4 O 7 having a magnetic structure in the XRD diffraction pattern measured by the method described later.
  • STR-100N specific surface area 100 m 2 / g
  • titanium hydride manufactured by Toho Tech Co., Ltd., trade name "Titanium hydride powder TCH-450”
  • Example 2 Anatas-type titanium oxide (manufactured by Sakai Chemical Industry Co., Ltd., trade name "SSP-25", specific surface area 270 m 2 / g) 15.8 g, silicon dioxide (manufactured by Sigma Aldrich, trade name “silica”) 2.8 g, hydrogenation After 2.8 g of titanium (manufactured by Toho Tech Co., Ltd., trade name "titanium hydride powder TCH-450”) is dry-mixed, it is placed in an alumina boat, and 100 vol% hydrogen is distributed at 400 ml / min in an atmosphere firing furnace. An example in which the temperature was raised to 800 ° C. over 77 minutes, held at 800 ° C. for 8 hours, then naturally cooled to room temperature, and identified as Ti 4 O 7 having a magnetic structure in the XRD diffraction pattern measured by the method described later. 2 powders were obtained.
  • SSP-25 specific surface area 270 m 2 / g
  • silicon dioxide manufactured by
  • Example 3 Rutile type titanium oxide (manufactured by Sakai Chemical Industry Co., Ltd., trade name "STR-100N", specific surface area 100 m 2 / g) 15.8 g and titanium hydride (manufactured by Toho Tech Co., Ltd., trade name "Titanium hydride powder TCH-450” ) After dry mixing 4.2 g, the mixture was placed in an alumina boat, heated to 710 ° C. over 68 minutes while circulating 100 vol% hydrogen at 400 ml / min in an atmosphere firing furnace, and held at 710 ° C. for 8 hours. Then, it was naturally cooled to room temperature to obtain Example 3 powder identified as Ti 2 O 3 having a corundum structure in the XRD diffraction pattern measured by the method described later.
  • STR-100N specific surface area 100 m 2 / g
  • titanium hydride manufactured by Toho Tech Co., Ltd., trade name "Titanium hydride powder TCH-450”
  • Comparative Example 1 20 g of rutile-type titanium oxide (manufactured by Sakai Chemical Industry Co., Ltd., trade name "STR-100N", specific surface area 100 m 2 / g) is placed in an alumina crucible, heated to 870 ° C over 84 minutes in an electric furnace, and heated to 870 ° C. After holding for 5 hours, the mixture was naturally cooled to room temperature to obtain Comparative Example 1 powder.
  • rutile-type titanium oxide manufactured by Sakai Chemical Industry Co., Ltd., trade name "STR-100N"
  • specific surface area 100 m 2 / g specific surface area 100 m 2 / g
  • Comparative Example 3 Anatas-type titanium oxide (manufactured by Sakai Chemical Industry Co., Ltd., trade name "SSP-25", specific surface area 270 m 2 / g) was placed in an alumina boat, and 100 vol% hydrogen was distributed at 300 ml / min in an atmosphere firing furnace. The temperature was raised to 1000 ° C. over 97 minutes, kept at 1000 ° C. for 5 hours, and then naturally cooled to room temperature to obtain Comparative Example 3 powder.
  • SSP-25 specific surface area 270 m 2 / g
  • Comparative Example 4 Rutyl type titanium oxide (manufactured by Sakai Chemical Industry Co., Ltd., trade name "STR-100N", specific surface area 100 m 2 / g) 7.9 g and titanium hydride (manufactured by Toho Tech Co., Ltd., trade name "TCH-450 hydride”” ) 2.1 g was dry-mixed, placed in an alumina boat, heated to 1100 ° C. over 107 minutes while circulating 100 vol% hydrogen at 400 ml / min in an atmospheric firing furnace, and held at 1100 ° C. for 3 hours. Then, it was naturally cooled to room temperature to obtain Comparative Example 4 powder.
  • Comparative Example 7 Carbon (manufactured by Cabot Corporation, trade name "VULCAN XC-72R") was used.
  • Examples 1 to 3 and Comparative Examples 1 to 7 were measured and evaluated by the following methods, respectively. The results are shown in Table 1. Further, the electron microscope observation results of the materials of Examples 1 to 3 and Comparative Examples 3 and 4 are shown in FIGS. 1 to 5.
  • the composition formula of titanium oxide before the heat treatment is TiOx 1
  • the weight is W 1 (g)
  • the weight after the heat treatment is W 2 (g).
  • Moles of TiOx 1 before the heat treatment W 1 / (M T + x 1 M O)
  • x 1 (W 1 (M T + 2M O) -W 2 M T) / W 2 M O Will be. From the above formula, x 1 was calculated. Furthermore, in order to exclude the influence of weight change due to the heat treatment of the moisture adhering to the titanium oxide to be measured before the heat treatment, titanium oxide (manufactured by Sakai Chemical Industry Co., Ltd., trade name "STR-100N", specific surface area 100 m 2 / g).
  • ⁇ ⁇ S 6 ⁇ ( ⁇ ⁇ S) From the above formula, the particle size in consideration of the specific surface area of the titanium dioxide powders of Examples and Comparative Examples was calculated with the density of titanium dioxide being 4.0 g / cm 3.
  • X-ray source: Cu-K ⁇ ray Measurement range: 2 ⁇ 10 to 70 ° Scan speed: 5 ° / min Voltage: 50kV Current: 300mA
  • the powder resistivity measurement system MCP-PD51 type manufactured by Mitsubishi Chemical Analytech Co., Ltd. was used to measure the volume resistivity of the powder.
  • the powder resistance measurement system consists of a hydraulic powder press unit, a four-probe probe, and a high resistance measurement device (Lorester GX MCP-T700 manufactured by the same company).
  • Example and Comparative Example 0.5 g of each of the powders was placed in an alumina pit, and the powder temperature 1 was measured using a radiation thermometer THI-300 (manufactured by Ichinen TASCO), and then a single-function microwave oven IM-573 (Iwatani Corp.). The powder temperature 2 was measured again by irradiating an electromagnetic wave of 2.4 GHz at 600 W for 2 minutes using (manufactured by the same company). Further, after allowing to cool for 2 minutes, the powder temperature 3 was measured. The radio wave heating rate and the heat dissipation rate after radio wave heating were calculated from the measured temperature and the following formula.
  • Radio wave absorption characteristics of the resin molded product produced by mixing the materials of Example 1 and Comparative Example 7 with the resin by the following method were evaluated.
  • the evaluation method and results are as follows. ⁇ Radio wave absorption characteristics> Example 1 powder 28.44 g, or Comparative Example 7 powder having the same bulk as Example 1 powder, epoxy resin (Epiclon 850 manufactured by DIC) 10.00 g, polyfunctional thiol epoxy resin curing agent (manufactured by SC Organic Chemical).
  • Example 1 The test piece prepared using the powder had a radio wave absorption characteristic of 104, and it was confirmed that the test piece had excellent characteristics as an electromagnetic wave absorption / emission material.
  • x in TiOx is a number of 1 ⁇ x ⁇ 1.8, the specific surface area is 5 m 2 / g or more, and the average particle size / specific surface area conversion particle size is 0.
  • the titanium oxides of Examples 1 to 3 having 5 to 3.0 had a high heating rate when irradiated with radio waves or electromagnetic waves using light and a heat dissipation rate after heating the radio waves, whereas the sub-titanium oxides had a high specific surface area.
  • Both the heating rate and the subsequent heat dissipation rate were slower than those of titanium oxide of Examples 1 to 3.
  • the titanium borooxides of Examples 1 to 3 have a heating rate and a heating rate when irradiated with electromagnetic waves as compared with the barium titanate and iron oxide of Comparative Examples 5 and 6 which have been conventionally used as dielectric materials and magnetic materials. All of the subsequent heat dissipation speeds were fast.
  • x in TiOx is a number of 1 ⁇ x ⁇ 1.8, the specific surface area is 5 m 2 / g or more, and the average particle size / specific surface area conversion particle size is 0.5 to 3. It was confirmed that titanium hydroxide, which is 0, has excellent properties as an energy absorbing / releasing material such as electromagnetic waves and heat.
  • the subtitanium oxides of Examples 1 to 3 act on the electromagnetic wave absorption characteristics as compared with the titanium oxides and barium titanate of Comparative Examples 1 to 5 which have been conventionally used as dielectric materials. It was confirmed that the real part of the complex permittivity at 10 GHz and the dielectric loss tangent are high, and the real part of the complex permittivity at 10 GHz is higher than that of the carbon of Comparative Example 7, which has been conventionally used as an electromagnetic wave absorber. Further, it was confirmed that the molded product in which titanium oxide of Example 1 was mixed with the resin had radio wave absorption characteristics equal to or higher than those of the molded product in which carbon and the resin were mixed.

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Abstract

L'invention fournit un matériau présentant une capacité d'absorption d'ondes électromagnétiques élevée par rapport aux matériaux d'absorption d'ondes électromagnétiques de l'art antérieur. Plus précisément, l'invention concerne un matériau d'absorption et décharge d'énergie qui est caractéristique en ce qu'il est constitué par un suboxyde de titane représenté par la formule de composition ＴｉＯｘ（ｘ représente un nombre tel que １≦ｘ＜１,８）, présentant une surface spécifique supérieure ou égale à ５ｍ２／ｇ, et tel que diamètre particulaire moyen / diamètre particulaire exprimé en surface spécifique vaut entre ０,５ et ３,０.
PCT/JP2021/025431 2020-07-16 2021-07-06 Matériau d'absorption et décharge d'énergie WO2022014402A1 (fr)

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Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2015195193A (ja) * 2014-03-20 2015-11-05 国立大学法人九州大学 燃料電池用アノード電極材料およびその製造方法、並びに燃料電池用電極、膜電極接合体及び固体高分子形燃料電池
WO2017043449A1 (fr) * 2015-09-07 2017-03-16 国立大学法人東京大学 Agglomérat d'oxyde de titane, procédé de production d'agglomérat d'oxyde de titane, poudre d'oxyde de titane, corps moulé d'oxyde de titane, catalyseur d'électrode de batterie, matériau conducteur d'électrode de batterie, et diélectrique à micro-ondes et ondes millimétriques
WO2018096851A1 (fr) * 2016-11-22 2018-05-31 堺化学工業株式会社 Matériau d'électrode et son procédé de production
JP2019173130A (ja) * 2018-03-29 2019-10-10 堺化学工業株式会社 電気化学的還元用電極材料、電気化学的還元用電極及び電気化学的還元装置

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