WO2022210484A1 - 有機修飾窒化ホウ素粒子、及びその連続製造方法 - Google Patents
有機修飾窒化ホウ素粒子、及びその連続製造方法 Download PDFInfo
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- C01B21/00—Nitrogen; Compounds thereof
- C01B21/06—Binary compounds of nitrogen with metals, with silicon, or with boron, or with carbon, i.e. nitrides; Compounds of nitrogen with more than one metal, silicon or boron
- C01B21/064—Binary compounds of nitrogen with metals, with silicon, or with boron, or with carbon, i.e. nitrides; Compounds of nitrogen with more than one metal, silicon or boron with boron
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- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P20/00—Technologies relating to chemical industry
- Y02P20/50—Improvements relating to the production of bulk chemicals
- Y02P20/54—Improvements relating to the production of bulk chemicals using solvents, e.g. supercritical solvents or ionic liquids
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- the present invention relates to organically modified boron nitride particles and a continuous production method thereof.
- heat-generating electronic components such as CPUs (Central Processing Units) become smaller and more powerful, the amount of heat generated per unit area from these electronic components is becoming extremely large. Cooling of the heat-generating electronic components is required in order to prevent the heat-generating electronic components from failing over a long period of time. Metal heatsinks and enclosures are used for cooling.
- thermally conductive materials are used to efficiently conduct heat from heat-generating electronic components to cooling units such as heat sinks and housings.
- boron nitride powder is scaly and has a low affinity with resin, so it is difficult to fill the resin with high density, and as a result, high thermal conductivity cannot be obtained. Attempting high filling results in void formation, which reduces thermal conductivity. In addition, the viscosity increases rapidly, which becomes a factor that hinders molding processability and adhesion. Therefore, it is a problem to increase the affinity with the boron nitride powder.
- the surface properties of the boron nitride powder are hydrophobic, it may not disperse in water itself or may float on water, making it difficult to react with organic molecules. In such a case, even if the reaction can be carried out in a small batch-type apparatus, it is necessary to supply a stable boron nitride slurry to the reaction apparatus with a high-pressure pump for continuous production.
- organic modification for maintaining molding processability and adhesion while achieving high thermal conductivity requires optimum control of the properties of modifiers and modification density.
- Patent Document 1 the method described in Patent Document 1 is based on a hydrothermal synthesis method using a batch reactor (batch reactor). Therefore, it is desired to provide a continuous reactor production system that increases productivity.
- a method for producing boron nitride powder as a raw material (1) a method of reacting molten boric anhydride (B 2 O 3 ) and nitrogen or ammonia (NH 3 ) with a calcium phosphate (Ca 3 PO 4 ) catalyst, (2) ) A method of reacting boric acid or an alkali borate with an organic nitrogen compound such as urea, guanidine, or melamine (C 3 H 6 N 6 ) in a high-temperature nitrogen-ammonia atmosphere; 3 BO 3 ) and ammonium chloride in an ammonia atmosphere, and (4) a method of reacting boron trichloride (BCl 3 ) with ammonia at high temperature.
- the properties and reactivity of the obtained boron nitride powder differ greatly depending on the type of manufacturing method. For example, some boron nitride powders are water-dispersible, while others are water-floating.
- the boron nitride powder When realizing a production system with a continuous reactor, it is necessary for the boron nitride powder to form a homogeneous phase in the water-based material and form a slurry feed. If the boron nitride powder floats in the water-based material, or if the boron nitride powder gels when added to the water-based material, boron nitride particles cannot be continuously provided. In addition, highly efficient organic modification with good reproducibility cannot be performed unless the surface properties of the boron nitride powder as a raw material are controlled and the impurities contained in the boron nitride powder are removed.
- the present invention has been made in view of such problems, and an object of the present invention is to stably and efficiently provide boron nitride particles having a high organic modification rate.
- the present inventors continuously supplied boron nitride that had undergone a predetermined pretreatment and an organic modifier, and obtained a water-based material in a subcritical state.
- the present inventors have found that the above-mentioned problems can be solved by continuous contact in the coexistence of an acid or a base, and have completed the present invention.
- the present invention provides the following.
- the invention according to a first feature is a contacting step of continuously supplying pretreated boron nitride and an organic modifier, and continuously contacting the water-based material in a subcritical state in the presence of an acid or a base.
- the pretreatment comprises: adding an acid to the boron nitride; adding a base to the boron nitride; adding an oxidizing agent to the boron nitride; adding a reducing agent to the boron nitride;
- Provided is a continuous method for producing organically modified boron nitride particles, including any one or more selected from performing a thermal treatment.
- the impurities contained in the raw material boron nitride can be removed by performing the pretreatment.
- the B—N bond contained in the boron nitride powder as a raw material can be in the form of, for example, —BOH and HN—, —B(OH) 2 and H 2 N—, etc., thereby forming an aqueous solvent.
- the raw material liquid can be made into a slurry feed, and stable supply of the raw material liquid is possible.
- the pretreated boron nitride and the organic modifier are continuously supplied and continuously contacted in the presence of an aqueous material in a subcritical state and an acid or base.
- a production system in a reactor can be realized, resulting in increased productivity of organically modified boron nitride particles.
- the invention according to the second characteristic provides a method according to the invention according to the first characteristic, wherein the organic modifier has amphipathic properties.
- the raw material liquid can be made into a uniform slurry feed, and the raw material liquid can be stably and continuously supplied during the contacting process.
- the invention according to a third feature is the invention according to the first feature, wherein the organic modifier is at least one selected from phosphonic acids, catechols, alcohols, thiols, amines and carboxylic acids.
- a method is provided comprising:
- the surface state of nitrogen-containing ions contained in the boron nitride-containing liquid is improved by bonding HN- or H 2 N- with an organic modifier, such as NHPO 4 - (phosphonic acid ), NHCO—(carboxylic acid), and the like.
- an organic modifier such as NHPO 4 - (phosphonic acid ), NHCO—(carboxylic acid), and the like.
- the surface state of the boron-containing ions contained in the boron nitride-containing liquid can be in the form of, for example, BNH-(amine) by combining -BOH or -B(OH) 2 with an organic modifier. . Therefore, it is possible to stably and efficiently provide boron nitride particles having a higher organic modification rate.
- the invention according to a fourth feature provides a method according to any one of the first to third features, wherein the concentration of the organic modifier is 50% by mass or less with respect to 100 parts by mass of the raw material liquid. do.
- the dehydration bonding reaction between the nitrogen-containing ions or boron-containing ions contained in the raw material liquid and the organic modifier can be appropriately promoted in the contacting step, resulting in a high organic modification rate. can be provided more stably and efficiently.
- the invention according to a fifth feature is the invention according to any one of the first to fourth features, wherein the temperature of the water-based material is 150 ° C. or more and 370 ° C. or less, and the pressure is the water-based material at the temperature of the water-based material.
- the material has a saturated vapor pressure of 40 MPa or higher.
- the amount of hydroxyl groups and amino groups on the surface of the boron nitride powder can be made suitable, and as a result, more organic modification can be performed. Therefore, according to the fifth aspect of the invention, it is possible to more stably and efficiently provide boron nitride particles having a high organic modification rate.
- boron nitride particles having a high organic modification rate can be stably and efficiently provided.
- FIG. 1 is a schematic diagram of a continuous manufacturing apparatus 1 of this embodiment.
- FIG. 2 is a schematic diagram of the mixing section 41 of the present embodiment.
- FIG. 3 is a schematic diagram of a continuous manufacturing apparatus 1 that is different from FIG.
- FIG. 4 is a schematic diagram of a continuous manufacturing apparatus 1 according to a modification.
- FIG. 1 is a schematic diagram of a continuous production apparatus 1 for continuously producing boron nitride particles.
- the continuous manufacturing apparatus 1 includes raw material liquid supply means 10 , high-temperature/high-pressure means 20 , water-based material supply means 30 , contact means 40 , and particle collection means 50 .
- the raw material liquid supply means 10 includes a solvent storage unit 11 that stores a solvent, a raw material adjustment unit 12 that dissolves raw materials using the solvent supplied from the solvent storage unit 11 to form a raw material liquid, and deaerates the raw material liquid. It has a raw material degassing unit 13 and a raw material pressurizing unit 14 that pressurizes the degassed raw material liquid.
- the solvent storage unit 11 is not particularly limited as long as it stores a solvent. Examples of the solvent storage unit 11 include storage tanks, storage tanks, bottles, and the like. The solvent storage unit 11 is configured to be able to supply the solvent to the raw material adjustment unit 12, the water-based material degassing unit 21, and the low-temperature/high-pressure fluid preparation unit 511, which will be described later.
- the solvent is not particularly limited as long as it is a water-based material.
- a water-based material refers to water, a polar organic solvent, or a mixed solvent of water and a polar organic solvent.
- Water-based materials include, for example, water, alcohols, carboxylic acids, ketones, ethers, esters, amides, amines, sulfur compounds, and mixtures thereof.
- Alcohols include methanol, ethanol, isopropyl alcohol, t-butyl alcohol, propylene glycol and phenol.
- Carboxylic acids include lower carboxylic acids such as formic acid, acetic acid, propionic acid, butyric acid, valeric acid, and caproic acid.
- Ketones include acetone, methyl ethyl ketone and methyl isobutyl ketone.
- Ethers include ethylene glycol monobutyl ether, ethylene glycol monoethyl ether, tetrahydrofuran, dioxane, and methyl cellosolve.
- esters examples include ethyl acetate and butyl acetate.
- Amides include formamide, dimethylformamide, acetamide, dimethylacetamide, nitromethane and acetonitrile.
- Amines include methylamine, ethylamine, trimethylamine, triethylamine, monoethanolamine, diethanolamine, triethanolamine, pyridine, ethylenediamine, hexamethylenediamine, and the like.
- sulfur compounds include dimethyl sulfoxide and the like.
- the water-based material preferably contains one or more selected from water, alcohols and carboxylic acids, more preferably water, because it is easy to handle.
- the raw material adjustment unit 12 is not particularly limited as long as it dissolves or disperses the raw material using the solvent supplied from the solvent storage unit 11 to form a raw material liquid.
- Examples of the raw material adjusting unit 12 include a dissolving tank, a stirrer, and the like.
- the raw material adjusting section 12 is configured to be able to supply the raw material liquid to the raw material degassing section 13 . Since the raw material adjustment unit 12 converts the raw material into a raw material liquid, the raw material liquid can be heated by a predetermined heating device or brought into contact with a subcritical water-based material to continuously organically modify the boron nitride particles. .
- the raw material liquid in the present embodiment contains pretreated boron nitride and an organic modifier.
- the form of the raw material liquid is not particularly limited as long as it has fluidity, and examples thereof include aqueous solutions, slurries, pastes, suspensions, and the like containing raw material components.
- the raw material can be dispersed in an aqueous material such as ethanol to form a slurry.
- boron nitride Pretreatments of boron nitride include adding an acid to boron nitride, adding a base to boron nitride, adding an oxidizing agent to boron nitride, adding a reducing agent to boron nitride, and hydrothermally treating or solvothermally treating boron nitride. Any one or more selected from performing processing is included.
- the B—N bond contained in the boron nitride powder as a raw material can be in the form of, for example, —BOH and HN—, —B(OH) 2 and H 2 N—, etc., thereby forming an aqueous solvent.
- the raw material liquid can be made into a slurry feed, and the raw material liquid can be stably and continuously supplied.
- the pretreatment conditions are not particularly limited, but when the pretreatment is hydrothermal treatment or solvothermal treatment, if the treatment temperature exceeds 400 ° C., -BOH and HN-, -B(OH) 2 and H The amount of 2 N- and the like produced is rather reduced, which affects the subsequent organic modification. Therefore, the treatment temperature is preferably 400° C. or lower.
- the stock solution may contain an organic modifier.
- the organic modifier preferably has amphipathic properties. Amphiphilic refers to molecules that contain both polar and non-polar portions.
- amphipathic organic modifiers include any one or more selected from phosphonic acids, catechols, alcohols, thiols, amines and carboxylic acids.
- the bonding of HN- or H 2 N- with an organic modifier causes, for example, NHPO 4 - (phosphonic acid), NHCO- (carboxylic acid), and the like. can take form.
- the surface state of the boron-containing ions contained in the boron nitride-containing liquid can be in the form of, for example, BNH-(amine) by combining -BOH or -B(OH) 2 with an organic modifier. . This makes it possible to stably and efficiently provide boron nitride particles having a high organic modification rate.
- the organic group of monophosphonic acid includes, for example, an alkyl group, a vinyl group, a phenyl group, an alkylamino group, an alkylmercapto group, and the like.
- Examples of the organic group of diphosphonic acid include an alkylene group, vinylene group, acetylene group, phenylene group and derivatives thereof.
- Catechols are compounds having a benzene ring, in which one carbon atom out of six carbon atoms in the benzene ring is substituted with a hydroxyl group, and the ortho-position carbon atom relative to the hydroxyl group is also substituted with a hydroxyl group. . Catechols may also be substituted with hydroxyl groups or other functional groups at carbon atoms other than these two carbon atoms having hydroxyl groups.
- catechols include dopamine, benserazide, adrenaline, isoprenaline, dobutamine, noradrenaline, levodopa, trimetoquinol, entacapone, droxidopa, methyldopa, carbidopa, rutin, and tannic acid.
- Alcohols include methanol, ethanol, isopropyl alcohol, t-butyl alcohol, propylene glycol and phenol.
- Thiols refer to organic compounds having hydrogenated sulfur at their terminals, and are represented by the general formula R-SH (R is an organic group).
- thiols include pentanethiol, hexanethiol, heptanethiol, octanethiol, nonanethiol, decanethiol, undecanethiol, dodecanethiol, tridecanethiol, tetradecanethiol, pentadecanethiol, hexadecanethiol, heptadecanethiol, octadecanethiol, Nonadecanethiol, eicosanethiol, pentanedithiol, hexanedithiol, heptanedithiol, octanedithiol, nonanedithiol, decanedithiol, undecanedithiol, dode
- Amines include methylamine, ethylamine, trimethylamine, triethylamine, monoethanolamine, diethanolamine, triethanolamine, pyridine, ethylenediamine, hexamethylenediamine, and the like.
- Carboxylic acids include lower carboxylic acids such as formic acid, acetic acid, propionic acid, butyric acid, valeric acid, and caproic acid.
- the lower limit of the concentration of the organic modifier is not particularly limited, but should be such that the dehydration bonding reaction between the nitrogen-containing ions or boron-containing ions contained in the raw material solution and the organic modifier can proceed at a high modification rate. is preferred.
- the upper limit of the concentration of the organic modifier is not particularly limited, either. It is preferably to the extent that the dehydration bonding reaction with the organic modifier can proceed efficiently.
- the raw material liquid is continuously supplied and brought into continuous contact with the subcritical water-based material in the coexistence of an acid or a base.
- the timing of the coexistence of the acid or base is not particularly limited, and it is sufficient if the supply pipe for the acid or base is provided upstream of the position where the raw material liquid and the aqueous material are brought into contact with the contact means 40 .
- the supply pipe for the acid or base is provided upstream of the position where the raw material liquid and the aqueous material are brought into contact with the contact means 40 .
- the acid or base functions as a catalyst for organic modification reaction of boron nitride. Whether it is an acid or a base depends on the type of organic modifier. If the organic modifier is at least one selected from phosphonic acids, catechols, alcohols, thiols, and carboxylic acids, it is preferably coexistent with an acid.
- the type of acid is not particularly limited, and includes any one or more selected from hydrochloric acid, nitric acid, sulfuric acid, and boric acid.
- the organic modifier is an amine, it is preferably in the presence of a base.
- the type of base is not particularly limited, and includes any one or more selected from ammonia, sodium hydroxide, and potassium hydroxide.
- the pH of the contact liquid when the raw material liquid and the aqueous material are brought into contact with each other in the contacting means 40 should be adjusted to the isoelectric point pH of boron nitride and the acid dissociation constant pKa of the acid. or the base dissociation constant pKb of the base.
- the acid or base can be positioned as a catalyst for causing the organic modification reaction in the contact step.
- the bonding between HN- or H 2 N- and the organic modifier can be promoted with respect to the surface state of the nitrogen-containing ions contained in the boron nitride-containing liquid.
- bonding between —BOH or —B(OH) 2 and the organic modifier can be promoted with respect to the surface state of the boron-containing ions contained in the boron nitride-containing liquid. Therefore, according to this embodiment, boron nitride particles having a higher organic modification rate can be stably and efficiently provided.
- the raw material deaerator 13 is not particularly limited as long as it deaerates the raw material liquid.
- an existing technology degassing device such as a degassing device using ultrasonic waves, a degassing device for reducing pressure, a degassing device for feeding a rare gas into the raw material liquid, a degassing device using a permeable membrane, etc.
- a device, and a degassing device combining these existing technology degassing devices By degassing the raw material liquid, fluctuations in the supply amount of the raw material liquid caused by bubbles or the like generated by dissolved gas can be suppressed. Further, corrosion of the raw material pressurizing unit 14, the contact means 40, and the particle collecting means 50 due to dissolved oxygen can be avoided.
- the raw material pressurizing unit 14 is not particularly limited as long as it pressurizes the raw material liquid.
- a pressurizing pump can be used as the raw material pressurizing unit 14. By pressurizing the raw material liquid, the raw material liquid can be continuously supplied to the contact means 40 in a high pressure state.
- the high-temperature/high-pressure means 20 includes the solvent storage unit 11 described above, an aqueous material degassing unit 21 that degasses the aqueous material supplied from the solvent storage unit 11, and a pressurization unit 22 that pressurizes the degassed aqueous material. and a heating unit 23 for heating the pressurized water-based material.
- the water-based material deaerator 21 is not particularly limited as long as it deaerates the water-based material.
- a degassing device that uses ultrasonic waves for example, a degassing device that uses ultrasonic waves, a degassing device that decompresses, a degassing device that feeds a rare gas into the raw material liquid, a degassing device that uses a permeable membrane, etc.
- a degassing device, and a degassing device combining these degassing devices of existing technology, and the like can be mentioned.
- the pressurizing part 22 is not particularly limited as long as it pressurizes the water-based material.
- Examples of the pressurizing unit 22 include a pressurizing pump. By pressurizing the water-based material and heating it with a heating unit 23 to be described later, the water-based material is brought into a subcritical state and can be continuously supplied to the contact means 40 .
- the water-based material after pressurization is preferably in a subcritical state. This is because when the water-based material is in a supercritical state, the amounts of hydroxy groups and amino groups generated on the surface of the boron nitride powder are smaller than when the water-based material is in a subcritical state, which may affect subsequent organic modification.
- the pressure of the water-based material after pressurization is higher than the saturated vapor pressure. If the vapor pressure is less than the saturated vapor pressure, organically modified boron nitride particles cannot be produced even if the raw material liquid is brought into contact with the raw material liquid, which is not preferable.
- the pressure of the water-based material after pressurization is preferably 0.5 MPa or more, preferably 10 MPa, in order to make the amount of hydroxy groups and amino groups on the surface of the boron nitride powder suitable and to proceed with the subsequent organic modification more suitably. It is more preferably 20 MPa or more, and more preferably 20 MPa or more.
- the pressure of the water-based material after pressurization is 40 MPa or less. If the pressure exceeds 40 MPa, the cost for increasing the pressure resistance of the continuous manufacturing apparatus 1 increases remarkably, and the contact means 40 tends to deteriorate, which is not preferable.
- the pressure of the water-based material after pressurization is preferably 37 MPa or less. Moreover, from the viewpoint of suppressing deterioration of the contact means 40, the pressure of the water-based material after pressurization is more preferably 35 MPa or less. As a result, the cost for pressure resistance of the continuous manufacturing apparatus 1 can be reduced, and deterioration of the contact means 40 can be suppressed.
- the heating unit 23 is not particularly limited as long as it heats the water-based material.
- Examples of the heating unit 23 include a heating device that irradiates the water-based material with microwaves, a heating device that heats the water-based material by heat conduction from a heating element such as a heater, and the like.
- the water-based material is heated by the heating unit 23 to bring the water-based material into a subcritical state.
- the temperature of the water-based material after heating is 150°C or higher. If the temperature is less than 150°C, the water-based material and the organic modifier cannot form a homogeneous phase, which is not preferable. Moreover, it is not preferable because bond formation by dehydration reaction cannot be expected.
- the temperature of the water-based material after heating is preferably 200° C. or higher, preferably 250° C. or higher, in order to optimize the amount of hydroxy groups and amino groups on the surface of the boron nitride powder and to proceed with the subsequent organic modification more favorably. and more preferably 300° C. or higher.
- the temperature of the water-based material after heating is 370°C or lower, preferably 350°C or lower. If the temperature of the water-based material is too high, the amount of hydroxy groups and amino groups on the surface of the boron nitride powder will rather decrease, which is not preferable.
- the heating part 23 is, for example, inclined forward downward.
- the constricted portion is not particularly limited as long as it prevents backflow.
- As the constricted portion for example, a configuration using a thin tube, a spiral tube, or the like can be mentioned.
- the water-based material supply means 30 is configured by piping.
- the water-based material supply means 30 has a function capable of continuously supplying the high-temperature/high-pressure water-based material obtained by the high-temperature/high-pressure means 20 toward the contact means 40 .
- the periphery of the connection portion of the water-based material supply means 30 with the contact means 40 is formed in a substantially vertical direction, and is connected with the contact means 40 at its lower end. With this configuration, the high-temperature, high-pressure water-based material is guided from above to below in a substantially vertical direction.
- the contact means 40 is a mixing part 41 for mixing the raw material liquid continuously supplied from the raw material liquid supply means 10 and the aqueous material supplied from the aqueous material supply means 30, and the reaction product of the raw material liquid and the aqueous material. and a reaction processing unit 42 for imparting hydroxyl groups (hydroxyl groups) to the surface of boron nitride.
- the mixing section 41 is not particularly limited as long as it mixes the raw material liquid and the water-based material.
- FIG. 2 is a schematic diagram showing an example of the mixing section 41.
- the mixing unit 41 causes the tip of the nozzle 15 formed at the end of the raw material liquid supply means 10 to face the high-temperature and high-pressure water-based material supplied from the water-based material supply means 30.
- the mixing unit 41 preferably includes a structure for ejecting the raw material liquid from the tip of the nozzle 15 . By ejecting the raw material liquid from the tip of the nozzle 15, the raw material liquid and the water-based material are mixed at high speed to promote the reaction efficiency.
- the raw material liquid that undergoes phase separation by ejecting the raw material liquid from the tip of the nozzle 15, the raw material liquid is atomized and dispersed in the water-based material, and the raw material in the raw material liquid is dispersed in the high-temperature, high-pressure water-based material. A fine emulsion is formed at , further promoting the reaction efficiency.
- the mixing unit 41 is not particularly limited as long as it mixes the water-based material and the raw material liquid, and may have other configurations.
- a structure may be employed in which a water-based material guided substantially horizontally and a raw material liquid guided substantially horizontally are mixed, or as shown in FIG. 2(C).
- the structure may be such that the water-based material guided substantially horizontally and the raw material liquid guided substantially vertically are mixed.
- FIG. A structure may be adopted in which the water-based material is mixed with the raw material liquid guided obliquely upward.
- the raw material liquid is instantaneously heated to the subcritical temperature by the amount of heat possessed by the water-based material supplied from the water-based material supply means 30, and the reaction between the raw material liquid and the water-based material is started. This reaction initiates the surface treatment reaction of the boron nitride particles.
- the mixing unit 41 is not an essential component.
- the mixing section 41 may be provided to realize rapid mixing, but the mixing section 41 may not be provided.
- the raw material slurry supplied from the raw material adjusting section 12 directly passes through the heating section 23 .
- the heating temperature is preferably about 350.degree.
- reaction processing unit 42 is not particularly limited as long as it maintains the subcritical state, which is the reaction condition of the boron nitride particles, for a predetermined time.
- examples of the reaction processing unit 42 include a reactor covered with a constant temperature layer such as a helical tube wound multiple times inside a heating cylinder, a molten salt bath jacket, or a fluidized sand bath.
- reaction processing section 42 By making the reaction processing section 42 a reactor covered with a helical tube wound multiple times inside the heating cylinder or a constant temperature layer, heat conduction from the mixing section 41 through the wall surface causes the raw material liquid and the water-based material to Precise temperature control required for particle synthesis in a subcritical state can be achieved by preventing temperature changes and temperature unevenness in the mixture.
- a hydrocyclone can also be provided downstream of the reaction processing section 42 .
- the reaction product and the fluid can be separated, and the reactor temperature can be controlled by the pressure of this fluid.
- a configuration in which a hydrocyclone is provided is preferable because it can improve the recovery yield of the reaction product and can also improve the controllability of the reactor temperature.
- the structure in which the reaction processing section 42 is formed in a substantially vertical direction and the mixture of the raw material liquid and the aqueous material flows from the upper mixing section 41 to the lower hydrocyclone keeps the temperature of the reaction processing section 42 uniform. preferred because it is easy to
- reaction processing section 42 When the reaction product of the raw material liquid and the water-based material passes through the reaction processing section 42, a high-temperature, high-pressure fluid containing boron nitride particles with hydroxyl groups (hydroxyl groups) attached to their surfaces is discharged from the outlet of the reaction processing section 42.
- the reaction processing section 42 is preferably configured so that the reaction time of the fluid containing the raw material liquid and the water-based material is 5 minutes or longer. More preferably, the reaction time is set to 10 minutes or longer to further facilitate the surface treatment of the particles.
- the reaction processing section 42 is preferably configured such that the reaction time of the fluid containing the raw material liquid and the water-based material is 30 minutes or less. In order to further suppress deterioration, it is more preferable to configure the reaction time to be 20 minutes or less.
- the particle recovery means 50 has a high-temperature, high-pressure fluid cooling section 51 that cools the particle-containing high-temperature, high-pressure fluid output from the reaction processing section 42, and a particle recovery section 52 that recovers particles from the particle-containing high-temperature, high-pressure fluid.
- High temperature and high pressure fluid cooling unit 51 pressurizes the water-based material supplied from the solvent storage unit 11 to produce a low-temperature/high-pressure fluid, and the low-temperature/high-pressure fluid is added to the particle-containing high-temperature/high-pressure fluid to add the particle-containing low temperature fluid. and a fluid mixing unit 512 that produces a high-pressure fluid.
- the low-temperature/high-pressure fluid preparation unit 511 is not particularly limited as long as it pressurizes the water-based material supplied from the solvent storage unit 11 and converts it into a low-temperature/high-pressure fluid.
- a pressurizing pump can be used as the low-temperature and high-pressure fluid preparing unit 511. By pressurizing the water-based material, the low-temperature and high-pressure fluid can be continuously supplied to the fluid mixing section 512 .
- the above-described organic modifier can be supplied from the low-temperature/high-pressure fluid preparation unit 511 .
- the boron nitride particles are organically modified by heating in the fluid mixing section 512 . At that time, a rapid temperature rise is not required.
- the surface of the boron nitride particles is reacted to produce a hydroxyl group (hydroxy group) on the surface of the boron nitride particles, and the particles after the surface treatment are processed.
- a continuous process can be provided separate from the organic modification treatment.
- the organic modifier may be mixed with the raw material or may be supplied in a post-process of the raw material pressurizing section 14 .
- the fluid mixing unit 512 is particularly limited as long as it mixes the low-temperature, high-pressure fluid supplied from the low-temperature, high-pressure fluid preparation unit 511 and the high-temperature, high-pressure fluid supplied from the contact means 40 and sends the fluid to the particle recovery unit 52. not.
- the fluid mixing section 512 is configured, for example, as a tube connected to the low-temperature/high-pressure fluid preparation section 511 and the contact means 40 at one end and connected to the particle collection section 52 at the other end.
- the amount of heat associated with the change in state of the fluid that is, the amount of heat equivalent to the latent heat of vaporization
- the high-temperature, high-pressure fluid is cooled to a temperature below the critical temperature by this mixing, the high-temperature, high-pressure fluid is rapidly cooled, and the reaction that generates particles can be stopped almost instantaneously. Therefore, the particles, which are the product, can be arranged to have a substantially uniform particle size.
- the organically modified boron nitride particles can be recovered from the particle-containing low-temperature, high-pressure fluid.
- the fluid mixing unit 512 preferably further includes a structure for externally cooling the particle-containing low-temperature, high-pressure fluid whose temperature is below the critical temperature.
- a structure for externally cooling the particle-containing low-temperature and high-pressure fluid whose temperature is below the critical temperature the particle-containing low-temperature and high-pressure fluid can be produced while suppressing the consumption of the low-temperature and high-pressure fluid and the decrease in the concentration of particles contained in the mixed fluid. is lowered to a temperature suitable for collecting particles in the particle collecting section 52 .
- the particle recovery unit 52 includes a filter 521 that solid-liquid separates the particle-containing low-temperature/high-pressure fluid into particles and the low-temperature/high-pressure fluid, and a particle that is provided below the filter 521 in the gravitational direction and recovers the particles separated by the filter 521. It includes a reservoir 522 and a drain tank 523 for draining the low-temperature, high-pressure fluid separated by the filter 521 .
- the filter 521 is not particularly limited as long as it separates the particles and the low-temperature, high-pressure fluid from the particle-containing, low-temperature, high-pressure fluid supplied from below in the direction of gravity.
- Examples of the filter 521 include an in-line filter.
- a filter 521 separates the particles from the low temperature and high pressure fluid so that the organically modified boron nitride particles can be collected. Since the particle-containing low-temperature, high-pressure fluid is supplied to the filter 521 from below in the direction of gravity, the particles captured by the filter 521 drop by gravity into the particle reservoir 522 installed below the gravity. Therefore, formation of filter cake on the surface of the filter 521 is suppressed, and clogging of the filter 521 due to accumulation of filter cake can be alleviated. As a result, long-term stable operation becomes possible, and particles can be easily collected.
- the filter 521 may be of a fixed type or of a movable piston type.
- the particle reservoir 522 is not particularly limited as long as it collects particles falling from the filter 521 . By collecting the particles dropped from the filter 521 by the particle reservoir 522, the particles generated by the contact means 40 and cooled by the high-temperature/high-pressure fluid cooling unit 51 can be collected.
- the particle recovery section 52 is divided into a plurality of channels. By dividing into a plurality of channels, it is possible to recover the product accumulated in the particle reservoir 522 under normal pressure while switching the recovery device.
- the drainage tank 523 is not particularly limited as long as it collects the low-temperature, high-pressure fluid separated by the filter 521 .
- the drainage tank 523 has a volume, strength, corrosion resistance, etc. suitable for containing a low-temperature, high-pressure fluid.
- the solvent stored in the solvent storage section 11 is supplied to the raw material adjustment section 12 .
- the supplied solvent dissolves the raw material boron nitride in the raw material adjustment unit 12 and becomes a raw material liquid.
- the produced raw material liquid is degassed in the raw material degassing section 13 and sent to the raw material pressurizing section 14 .
- the degassed raw material liquid is pressurized by the raw material pressurizing section 14 and delivered to the mixing section 41 .
- the solvent stored in the solvent storage unit 11 is supplied to the water-based material degassing unit 21 .
- the supplied solvent is degassed in the water-based material degassing section 21 and delivered to the pressurizing section 22 .
- the degassed water-based material is pressurized by the pressurizing unit 22, sent to the heating unit 23 and heated, and becomes subcritical or supercritical. Then, the subcritical or supercritical water-based material is delivered to the mixing section 41 via the water-based material supply means 30 .
- the high-temperature, high-pressure fluid supplied from the reaction processing unit 42 is mixed with the low-temperature, high-pressure fluid obtained by pressurizing the solvent stored in the solvent storage unit 11 in the low-temperature, high-pressure fluid preparation unit 511 in the fluid mixing unit 512 .
- This mixing cools the high-temperature, high-pressure fluid to stop the organic modification reaction of the particles, resulting in a low-temperature, high-pressure fluid containing organically modified boron nitride particles.
- the low temperature and high pressure fluid is delivered to filter 521 .
- the particle-containing low-temperature, high-pressure fluid delivered from the fluid mixing section 512 is supplied to the filter 521 from below in the direction of gravity, and is separated into the organically modified boron nitride particles and the low-temperature, high-pressure fluid.
- the organically modified boron nitride particles drop by gravity and are collected in a particle reservoir 522 installed downward in the direction of gravity, and the low-temperature, high-pressure fluid that has passed through the filter 521 is collected in a drain tank 523 .
- a production system in a continuous reactor can be realized by supplying the raw material liquid and the aqueous material from the apparatus inlet and discharging the organically modified boron nitride particles from the apparatus outlet. The productivity of modified boron nitride particles is increased.
- boron nitride particles having a high organic modification rate can be stably and efficiently provided.
- FIG. 4 is a schematic diagram of a continuous manufacturing apparatus 1 according to a modification.
- the source liquid supply means 10, the high temperature/high pressure means 20, and the water-based material supply means 30 are configured on separate routes, and the outlet of the source liquid supply means 10 and the outlet of the water-based material supply means 30 are contact means. Although it was configured to join at the entrance of 40, it is not limited to this. As shown in FIG. 4, a heating unit 23 is provided between the outlet of the raw material pressurizing unit 14 and the inlet of the contact unit 40, and the raw material liquid supply unit 10, the high temperature/high pressure unit 20, and the aqueous material supply unit 30 are combined into one route. may be configured with According to the continuous manufacturing apparatus 1 according to the modified example, the apparatus configuration can be simplified.
- raw material supply means 11 solvent storage unit 12 raw material adjusting unit 13 raw material degassing unit 14 raw material pressurizing unit 15 nozzle 20 high temperature/high pressure means 21 water-based material degassing unit 22 pressurizing unit 23 heating unit 30 water-based material supply Means 40 Contact Means 41 Mixing Section 42 Reaction Processing Section 50 Particle Collection Means 51 High Temperature/High Pressure Fluid Cooling Section 511 Low Temperature/High Pressure Fluid Preparation Section 512 Fluid Mixing Section 52 Particle Collection Section 521 Filter 522 Particle Reservoir 523 Drain Tank
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Abstract
Description
図1は、窒化ホウ素粒子を連続的に製造する連続製造装置1の概略模式図である。
原料液供給手段10は、溶媒を貯蔵する溶媒貯蔵部11と、溶媒貯蔵部11から供給される溶媒を用いて原料を溶解し、原料液にする原料調整部12と、原料液を脱気する原料脱気部13と、脱気された原料液を加圧する原料加圧部14と、を有する。
溶媒貯蔵部11は、溶媒を貯蔵するものであれば、特に限定されない。溶媒貯蔵部11として、例えば、貯蔵槽、貯蔵タンク、瓶等が挙げられる。溶媒貯蔵部11は、後に説明する原料調整部12、水系材料脱気部21及び低温高圧流体調製部511に、溶媒を供給可能に構成されている。
原料調整部12は、溶媒貯蔵部11から供給される溶媒を用いて原料を溶解又は分散し、原料液にするものであれば、特に限定されない。原料調整部12として、例えば、溶解槽、撹拌器等が挙げられる。原料調整部12は、原料脱気部13に原料液を供給可能に構成されている。原料調整部12が原料を原料液にするため、原料液を所定の加熱装置で加熱させるか、あるいは亜臨界状態の水系材料とを接触させ、窒化ホウ素粒子を連続して有機修飾することができる。
本実施形態における原料液は、前処理がなされた窒化ホウ素と有機修飾剤とを含有する。原料液の態様は、流動性があれば特に限定されず、原料成分を含有する水溶液やスラリー、ペーストあるいは懸濁液等が挙げられる。
窒化ホウ素の前処理は、窒化ホウ素に酸を加えること、窒化ホウ素に塩基を加えること、窒化ホウ素に酸化剤を加えること、窒化ホウ素に還元剤を加えること、及び窒化ホウ素に水熱処理又はソルボサーマル処理を行うことから選択されるいずれか1種以上を含む。
必須ではないが、原料液は、有機修飾剤を含んでいてもよい。有機修飾剤は、両親媒性を有することが好ましい。両親媒性とは、極性部分及び非極性部分の両方を含む分子をいう。
後に説明する接触手段40では、原料液を連続的に供給し、亜臨界状態にある水系材料と酸又は塩基の共存下で連続的に接触させる。
原料脱気部13は、原料液を脱気するものであれば、特に限定されない。原料脱気部13として、例えば、超音波を用いる脱気装置、減圧を行う脱気装置、原料液中に希ガスを送り込む脱気装置、透過膜を用いる脱気装置等の既存技術の脱気装置、及び、これら既存技術の脱気装置を組み合わせた脱気装置等が挙げられる。原料液を脱気することにより、溶存ガスにより生じた気泡等が引き起こす原料液の供給量の変動が抑えられる。また、溶存酸素による原料加圧部14、接触手段40、粒子回収手段50の腐食も避けられる。
原料加圧部14は、原料液を加圧するものであれば、特に限定されない。原料加圧部14として、例えば、加圧ポンプが挙げられる。原料液を加圧することにより、高圧状態の接触手段40へ原料液を連続的に供給できる。
続いて、高温・高圧手段20について説明する。高温・高圧手段20は、上述の溶媒貯蔵部11と、溶媒貯蔵部11から供給される水系材料を脱気する水系材料脱気部21と、脱気された水系材料を加圧する加圧部22と、加圧された水系材料を加熱する加熱部23と、を有する。
水系材料脱気部21は、水系材料を脱気するものであれば、特に限定されない。水系材料脱気部21として、例えば、超音波を用いる脱気装置、減圧を行う脱気装置、原料液中に希ガスを送り込む脱気装置、透過膜を用いる脱気装置等の既存技術の脱気装置、及び、これら既存技術の脱気装置を組み合わせた脱気装置等が挙げられる。水系材料を脱気することにより、溶存ガスにより生じた気泡等が引き起こす水系材料の供給量の変動が抑えられる。また、溶存酸素による加圧部22、加熱部23、接触手段40、粒子回収手段50の腐食も避けられる。
加圧部22は、水系材料を加圧するものであれば、特に限定されない。加圧部22として、例えば、加圧ポンプが挙げられる。水系材料を加圧し、後述する加熱部23で加熱することにより、水系材料を亜臨界状態にし、接触手段40へ連続的に供給できる。
加熱部23は、水系材料を加熱するものであれば、特に限定されない。加熱部23として、例えば、水系材料にマイクロ波を照射する加熱装置、ヒーター等の発熱体からの熱伝導によって水系材料を加熱する加熱装置等が挙げられる。加熱部23により、水系材料が加熱され、水系材料を亜臨界状態にできる。
水系材料供給手段30は、配管によって構成される。水系材料供給手段30は、高温・高圧手段20によって得られた高温高圧の水系材料を接触手段40に向けて連続供給可能な機能を有する。
接触手段40は、原料液供給手段10から連続供給される原料液と水系材料供給手段30から供給される水系材料とを混合する混合部41と、原料液と水系材料との反応生成物である窒化ホウ素の表面にヒドロキシ基(水酸基)を付与する反応処理部42と、を有する。
混合部41は、原料液と水系材料とを混合するものであれば、特に限定されない。
図1に戻る。反応処理部42は、窒化ホウ素粒子の反応条件である亜臨界状態を所定の時間維持するものであれば、特に限定されない。反応処理部42として、例えば、加熱筒内部において複数回巻かれた螺旋管、溶融塩浴ジャケット、流動砂浴等の恒温層で覆われた反応器等が挙げられる。
粒子回収手段50は、反応処理部42から出される粒子含有高温高圧流体を冷却する高温高圧流体冷却部51と、粒子含有高温高圧流体から粒子を回収する粒子回収部52と、を有する。
高温高圧流体冷却部51は、溶媒貯蔵部11から供給される水系材料を加圧し、低温高圧流体にする低温高圧流体調製部511と、低温高圧流体を粒子含有高温高圧流体に加え、粒子含有低温高圧流体にする流体混合部512と、を含んで構成される。
低温高圧流体調製部511は、溶媒貯蔵部11から供給される水系材料を加圧し、低温高圧流体にするものであれば、特に限定されない。低温高圧流体調製部511として、例えば、加圧ポンプが挙げられる。水系材料を加圧することにより、流体混合部512に低温高圧流体を連続的に供給できる。
流体混合部512は、低温高圧流体調製部511から供給される低温高圧流体と、接触手段40から供給される高温高圧流体とを混合して粒子回収部52に送出するものであれば、特に限定されない。流体混合部512は、例えば、一方の端部周辺において低温高圧流体調製部511及び接触手段40と接続され、他方の端部周辺において粒子回収部52と接続する管として構成される。
粒子回収部52は、粒子含有低温高圧流体から粒子と低温高圧流体とに固液分離するフィルタ521と、フィルタ521に対して重力方向下方に設けられ、フィルタ521で分離された粒子を回収する粒子溜522と、フィルタ521で分離された低温高圧流体を排水する排水槽523と、を含んで構成される。
フィルタ521は、重力方向下方から供給される粒子含有低温高圧流体から、粒子と低温高圧流体とを分離するものであれば、特に限定されない。フィルタ521として、例えば、インラインフィルタが挙げられる。フィルタ521が粒子と低温高圧流体とを分離するため、有機修飾された窒化ホウ素粒子を捕集できる。粒子含有低温高圧流体が重力方向下方からフィルタ521へ供給されるため、フィルタ521が捕集した粒子は、重力によって重力下方に設置された粒子溜522へと落下する。したがって、フィルタ521表面におけるフィルタケーキの形成が抑えられ、フィルタケーキの蓄積によるフィルタ521の目詰まりを緩和できる。これにより、長時間の安定した運転が可能となり、しかも、粒子を容易に回収することができる。
粒子溜522は、フィルタ521から落下してくる粒子を回収するものであれば、特に限定されない。粒子溜522がフィルタ521から落下してくる粒子を回収することにより、接触手段40で生成され、高温高圧流体冷却部51で冷却された粒子を回収できる。
排水槽523は、フィルタ521で分離された低温高圧流体を回収するものであれば、特に限定されない。排水槽523は、低温高圧流体の収容に適した容積、強度、耐食性等を有する。
続いて、有機修飾された窒化ホウ素粒子の連続製造方法について説明する。
溶媒貯蔵部11に貯蔵された溶媒は、原料調整部12に供給される。供給された溶媒は、原料調整部12において原料の窒化ホウ素を溶解し、原料液となる。生成された原料液は、原料脱気部13において脱気され、原料加圧部14に送出される。脱気された原料液は、原料加圧部14で加圧され、混合部41へと送出される。
上述の原料液の生成と加圧と同時に、溶媒貯蔵部11に貯蔵された溶媒を、水系材料脱気部21に供給する。供給された溶媒は、水系材料脱気部21で脱気され、加圧部22に送出される。脱気された水系材料は、加圧部22で加圧され、さらに加熱部23に送られて加熱され、亜臨界状態又は超臨界状態となる。そして、亜臨界状態又は超臨界状態の水系材料は、水系材料供給手段30を経由して混合部41に送出される。
原料加圧部14で加圧された原料液と、水系材料供給手段30から送出された亜臨界状態の水系材料とは、混合部41で接触して高温高圧流体となる。そして、高温高圧流体は、反応処理部42に送出される。高温高圧流体が亜臨界状態の反応処理部42に滞留することで表面処理反応が進み、窒化ホウ素粒子の表面へのヒドロキシ基(水酸基)の修飾が行われる。そして、高温高圧流体は、流体混合部512へ送出される。
反応処理部42から供給された高温高圧流体は、溶媒貯蔵部11に貯蔵された溶媒を低温高圧流体調製部511で加圧した低温高圧流体と、流体混合部512で混合される。この混合によって、高温高圧流体は冷却されて粒子の有機修飾反応を停止し、有機修飾された窒化ホウ素粒子を含有する低温高圧流体となる。当該低温高圧流体は、フィルタ521へ送出される。
流体混合部512から送出された粒子含有低温高圧流体は、重力方向下方からフィルタ521に供給され、有機修飾された窒化ホウ素粒子と低温高圧流体とに分離される。有機修飾された窒化ホウ素粒子は、重力によって落下して、重力方向下方に設置された粒子溜522に回収され、フィルタ521を通過した低温高圧流体は排水槽523に回収される。
図4は、変形例に係る連続製造装置1の概略模式図である。
10 原料供給手段
11 溶媒貯蔵部
12 原料調整部
13 原料脱気部
14 原料加圧部
15 ノズル
20 高温・高圧手段
21 水系材料脱気部
22 加圧部
23 加熱部
30 水系材料供給手段
40 接触手段
41 混合部
42 反応処理部
50 粒子回収手段
51 高温高圧流体冷却部
511 低温高圧流体調製部
512 流体混合部
52 粒子回収部
521 フィルタ
522 粒子溜
523 排水槽
Claims (5)
- 前処理がなされた窒化ホウ素と有機修飾剤とを連続的に供給し、亜臨界状態にある水系材料と酸又は塩基の共存下で連続的に接触させる接触工程を含み、
前記前処理は、窒化ホウ素に酸を加えること、窒化ホウ素に塩基を加えること、窒化ホウ素に酸化剤を加えること、窒化ホウ素に還元剤を加えること、及び窒化ホウ素に水熱処理又はソルボサーマル処理を行うことから選択されるいずれか1種以上を含む、有機修飾された窒化ホウ素粒子の連続製造方法。 - 前記有機修飾剤が両親媒性を有する、請求項1に記載の方法。
- 前記有機修飾剤は、フォスフォン酸類、カテコール類、アルコール類、チオール類、アミン類及びカルボン酸類から選択されるいずれか1種以上を含有する、請求項1又は2に記載の方法。
- 前記有機修飾剤の濃度が前記原料液100質量部に対して50質量%以下である、請求項1から3のいずれか1項に記載の方法。
- 前記水系材料の温度は150℃以上370℃以下であり、圧力は前記水系材料の温度での前記水系材料の飽和蒸気圧以上40MPa以下である、請求項1から4のいずれか1項に記載の方法。
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| CN118561242A (zh) * | 2024-07-03 | 2024-08-30 | 山东建筑大学 | 一种羟基化氮化硼的制备方法 |
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| WO2021010473A1 (ja) * | 2019-07-18 | 2021-01-21 | 住友電気工業株式会社 | 立方晶窒化硼素焼結体、及び、その製造方法 |
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| CN107324296B (zh) * | 2017-08-16 | 2019-06-21 | 中国科学技术大学 | 六方氮化硼的改性方法及羟基改性氮化硼 |
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| JP2013234237A (ja) * | 2012-05-08 | 2013-11-21 | Shin-Etsu Chemical Co Ltd | 有機修飾無機充填材の製造方法及び有機修飾無機充填材、並びに熱伝導性シリコーン組成物 |
| JP2015093790A (ja) * | 2013-11-11 | 2015-05-18 | 住友ベークライト株式会社 | 有機化合物修飾無機フィラーの製造方法および有機化合物修飾無機フィラー |
| WO2021010473A1 (ja) * | 2019-07-18 | 2021-01-21 | 住友電気工業株式会社 | 立方晶窒化硼素焼結体、及び、その製造方法 |
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| JP7064207B1 (ja) | 2022-05-10 |
| US20230166971A1 (en) | 2023-06-01 |
| EP4129899A4 (en) | 2023-10-25 |
| KR20220153125A (ko) | 2022-11-17 |
| US12312238B2 (en) | 2025-05-27 |
| EP4129899A1 (en) | 2023-02-08 |
| CN115485235A (zh) | 2022-12-16 |
| JP2022154039A (ja) | 2022-10-13 |
| JP2022155585A (ja) | 2022-10-13 |
| KR102567034B1 (ko) | 2023-08-11 |
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