CN115554939A - Aluminum nitride microcapsule and preparation method thereof - Google Patents
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Abstract
The application relates to an aluminum nitride microcapsule and a preparation method thereof, the aluminum nitride microcapsule comprises a core and a shell, the shell is a spherical water-resistant polymer material, the core is coated with powder in the shell, and the components of the powder comprise aluminum nitride particles. The aluminum nitride microcapsule coats the aluminum nitride spherical powder through the water-resistant high polymer material, so that the aluminum nitride microcapsule has a good hydrolysis resistance effect, and the spherical microcapsule has good fluidity. When the aluminum nitride microcapsule is applied to ceramic compression molding, the compactness is good, and the performance is more excellent; when added into a polymer matrix material, the material has the advantages of uniform filling, good compatibility, difficult migration and the like.
Description
Technical Field
The application relates to the technical field of aluminum nitride materials, in particular to an aluminum nitride microcapsule and a preparation method thereof.
Background
Generally, high-performance aluminum nitride powder is fine in raw material granularity, easy to bond, agglomerate and poor in fluidity, and is difficult to densely fill a mold during compression molding, so that the problems of air holes, cavities, layer cracks, elastic after effects and the like of a formed part occur. And the aluminum nitride is easily oxidized and hydrolyzed in the air, causing failure and the like.
It is known from the above that the conventional aluminum nitride raw material powder is poor in hydrolysis resistance and flowability, and thus is not convenient for practical use.
Disclosure of Invention
The application provides an aluminum nitride microcapsule and a preparation method thereof, which aim to solve the technical problem that the existing aluminum nitride powder is inconvenient for practical application due to poor hydrolysis resistance and fluidity.
In a first aspect, the present application provides an aluminum nitride microcapsule, which comprises a core and a shell, wherein the shell is a spherical water-resistant polymer material, the core is coated with powder in the shell, and the components of the powder comprise aluminum nitride particles.
Further, the content of the aluminum nitride in the aluminum nitride microcapsule is 70-99% by mass percent.
Further, the particle size of the aluminum nitride microcapsule is 5-100 μm.
Further, the aluminum nitride microcapsule comprises the following raw materials: aluminum nitride, a water-resistant polymer material and an auxiliary agent.
Further, the water-resistant high polymer material comprises at least one of phenolic resin, epoxy resin, polyvinyl butyral, polyvinyl alcohol, polyvinyl pyrrolidone, polyacrylic acid, polyurethane and ethyl cellulose.
Further, the auxiliary agent comprises a dispersant and a modifier; and/or
The dispersant comprises at least one of cetyl trimethyl ammonium bromide, polyethylene glycol, polypropylene oxide and sodium dodecyl sulfate; and/or
The modifier comprises at least one of yttrium oxide, cerium oxide, aluminum oxide, zirconium oxide, molybdenum disulfide, aluminum phosphate and aluminum dihydrogen phosphate.
In a second aspect, the present application provides a method for preparing an aluminum nitride microcapsule according to the first aspect, the method comprising:
mixing and grinding aluminum nitride powder, a water-resistant polymer material, an auxiliary agent and an organic solvent, and filtering to obtain slurry;
and atomizing the slurry into liquid drops, and drying the liquid drops to obtain the aluminum nitride microcapsule.
Further, the preparation method further comprises the following steps: and screening the aluminum nitride microcapsules by using a grading sieve to obtain the aluminum nitride microcapsules with different particle sizes.
Further, the process parameters of the grinding include: the grinding medium is at least one of zirconia grinding balls, alumina grinding balls and aluminum nitride grinding balls, the mass ratio of balls to materials is (3-30): 1, and the solid content of the grinding slurry is 30-70%.
Further, the drying process parameters include: the inlet temperature is 100-300 deg.C, the outlet temperature is 50-150 deg.C, and the solvent evaporation amount is 0.5-100kg/h.
Compared with the prior art, the technical scheme provided by the embodiment of the application has the following advantages:
the embodiment of the application provides an aluminum nitride microcapsule, which comprises spherical powder consisting of a plurality of aluminum nitride particles and a water-resistant high polymer material coated on the surface of the spherical powder; the aluminum nitride spherical powder is coated by the water-resistant high polymer material, so that the aluminum nitride microcapsule has a good hydrolysis resistance effect, and the spherical microcapsule has good fluidity. When the aluminum nitride microcapsule is applied to ceramic compression molding, the compactness is good, and the performance is more excellent; when added into a polymer matrix material, the material has the advantages of uniform filling, good compatibility, difficult migration and the like. Therefore, the aluminum nitride microcapsule can solve the technical problem that the existing aluminum nitride powder is inconvenient to be practically applied due to poor hydrolysis resistance and flowability.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the application and, together with the description, serve to explain the principles of the application.
In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings needed to be used in the description of the embodiments or the prior art will be briefly described below, and it is obvious for those skilled in the art to obtain other drawings without inventive exercise.
FIG. 1 is a scanning electron microscope image of an aluminum nitride microcapsule provided in an embodiment of the present application;
fig. 2 is an XRD pattern of an aluminum nitride microcapsule provided in an embodiment of the present application;
fig. 3 is a schematic flow chart of a method for preparing an aluminum nitride microcapsule according to an embodiment of the present disclosure.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present application clearer, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are some embodiments of the present application, but not all embodiments. All other embodiments obtained by a person of ordinary skill in the art based on the embodiments in the present application without making creative efforts shall fall within the protection scope of the present application.
Unless otherwise specifically indicated, various raw materials, reagents, instruments, equipment and the like used in the present application are either commercially available or can be prepared by existing methods.
Generally, high-performance aluminum nitride powder is fine in raw material granularity, easy to bond, agglomerate and poor in flowability, and is difficult to densely fill a mold during compression molding, so that the problems of air holes, cavities, layer cracks, after-effect elasticity and the like of a molded part are caused. And the aluminum nitride is easily oxidized and hydrolyzed in the air, causing failure and the like.
It is known from the above that the conventional aluminum nitride raw material powder is poor in hydrolysis resistance and flowability, and thus is not convenient for practical use.
In order to solve the technical problems, the embodiment of the invention provides the following general ideas:
as shown in fig. 1, the present application provides an aluminum nitride microcapsule, which includes a core and a shell, wherein the shell is a spherical water-resistant polymer material, the core is a powder coated in the shell, and the powder includes aluminum nitride particles.
The embodiment of the application provides an aluminum nitride microcapsule, which comprises spherical powder consisting of a plurality of aluminum nitride particles and a water-resistant high polymer material coated on the surface of the spherical powder; the aluminum nitride spherical powder is coated by the water-resistant high polymer material, so that the aluminum nitride microcapsule has a good hydrolysis resistance effect, and the spherical microcapsule has good fluidity. When the aluminum nitride microcapsule is applied to ceramic compression molding, the compactness is good, and the performance is more excellent; when added into a polymer matrix material, the material has the advantages of uniform filling, good compatibility, difficult migration and the like. Therefore, the aluminum nitride microcapsule can solve the technical problem that the existing aluminum nitride powder is inconvenient to be practically applied due to poor hydrolysis resistance and fluidity.
As an implementation manner of the embodiment of the present invention, the content of aluminum nitride in the aluminum nitride microcapsule is 70% to 99% by mass.
In the application, the content of the aluminum nitride in the aluminum nitride microcapsule is kept to be 70-99%, so that the microcapsule can keep the performance mainly based on the aluminum nitride, and meanwhile, the hydrolysis resistance and the fluidity of the aluminum nitride are improved. The total content of the rest components in the aluminum nitride microcapsule is 1-30 percent, and the aluminum nitride microcapsule comprises a water-resistant high polymer material or the water-resistant high polymer material and other additives.
As an implementation mode of the embodiment of the invention, the particle size of the aluminum nitride microcapsule is 5-100 μm.
In the application, the aluminum nitride microcapsule with the particle size is convenient to use and can be used as a filler and ceramic powder.
As an implementation of the embodiment of the present invention, the aluminum nitride microcapsule comprises the following raw materials: aluminum nitride, a water-resistant polymer material and an auxiliary agent.
In the application, the water-resistant high polymer material can be used as a coating skin of the aluminum nitride powder to improve the hydrolysis resistance of the aluminum nitride powder, and the auxiliary agent can be added as required to achieve the effects of reducing the sintering temperature, modifying the surface and the like. The aluminum nitride can be directly processed into powder by using aluminum nitride powder or aluminum nitride with other forms.
As an implementation manner of the embodiment of the present invention, the water-resistant polymer material includes at least one of phenolic resin, epoxy resin, polyvinyl butyral, polyvinyl alcohol, polyvinyl pyrrolidone, polyacrylic acid, polyurethane, and ethyl cellulose.
In the application, the water-resistant polymer material has a certain bonding effect, is easy to dry at high temperature and is suitable for being used as the outer skin of the capsule.
As an implementation of the embodiments of the present invention, the auxiliary agent includes a dispersant and a modifier; and/or
The dispersant comprises at least one of cetyl trimethyl ammonium bromide, polyethylene glycol, polypropylene oxide and sodium dodecyl sulfate; and/or
The modifier comprises at least one of yttrium oxide, cerium oxide, aluminum oxide, zirconium oxide, molybdenum disulfide, aluminum phosphate and aluminum dihydrogen phosphate.
In the application, the dispersing agent can uniformly disperse the aluminum nitride powder, and the ball milling efficiency is improved. The dispersant has good dispersing effect on ceramic powder, especially in organic solvent. The modifier can modify the aluminum nitride powder according to the requirement. The modifier of yttrium oxide and cerium oxide can reduce the sintering temperature of aluminum nitride ceramics, the modifier of aluminum oxide, zirconium oxide and molybdenum disulfide can improve the lubricating property of the material, the aluminum phosphate and the aluminum dihydrogen phosphate can improve the hydrolysis resistance of the aluminum nitride,
in a second aspect, the present application provides a method for preparing an aluminum nitride microcapsule according to the first aspect, as shown in fig. 3, the method comprising:
mixing and grinding aluminum nitride powder, a water-resistant polymer material, an auxiliary agent and an organic solvent, and filtering to obtain slurry;
and atomizing the slurry into liquid drops, and drying the liquid drops to obtain the aluminum nitride microcapsule.
In the application, the aluminum nitride powder is subjected to wet grinding and then is agglomerated and opened, the particle size is reduced, the particle size distribution is narrowed, a water-resistant high polymer material is rapidly dried on the surface of the AlN powder during spray drying to form a coating, and the coated AlN powder is tightly stacked to form spherical microcapsule powder. The droplets may be dried using a heated inert gas. The wet ball milling method has higher efficiency, is convenient for being uniformly mixed with high polymer materials, and can be matched with a spray drying process to prepare spherical powder. The organic solvent can dissolve and uniformly disperse the high molecular material.
The prepared spherical aluminum nitride microcapsule powder has higher apparent density and better fluidity, and is convenient for practical application of aluminum nitride. The microcapsule of the invention is spherical, has better fluidity and low grain diameter, has better compactness and lower sintering temperature than aluminum nitride powder when being applied to ceramic compression molding, and forms finer ceramic grains with more excellent performance. The aluminum nitride microcapsule has good fluidity and good hydrolysis resistance, has the advantages of uniform filling, good compatibility, difficult migration and the like when being added into a polymer matrix material, and has a certain application prospect when being used for preparing polymer composite materials with high heat conduction, heat resistance, enhanced mechanical properties, friction resistance and the like. The method is a spray drying granulation method, the prepared aluminum nitride microcapsules are spherical, the method is low in cost and suitable for large-scale production, and the aluminum nitride microcapsules with different sizes, components, specifications and performance differences can be prepared by regulating and controlling preparation conditions according to different application fields, so that the refined application direction of aluminum nitride is expanded. The invention has the advantages of good product performance, short production flow, recoverable solvent, low production cost, low carbon, environmental protection, high automation degree and the like, and accords with the development trend of current energy conservation and environmental protection.
As an implementation of the embodiment of the present invention, the preparation method further includes: and screening the aluminum nitride microcapsules by using a grading sieve to obtain the aluminum nitride microcapsules with different particle sizes.
As an implementation manner of the embodiment of the present invention, the process parameters of the grinding include: the grinding medium is at least one of zirconia grinding balls, alumina grinding balls and aluminum nitride grinding balls, the mass ratio of the ball material is (3-30): 1, and the solid content of the grinding slurry is 30-70%.
In this application, use zirconia grinding ball, alumina grinding ball and aluminium nitride grinding ball as grinding media, can avoid introducing too much impurity as far as possible. The particle size and specification of the aluminum nitride microcapsule can be controlled by regulating and controlling the ball milling condition.
As an implementation manner of the embodiment of the present invention, the drying process parameters include: the inlet temperature is 100-300 deg.C, the outlet temperature is 50-150 deg.C, and the solvent evaporation amount is 0.5-100kg/h.
In this application, through regulating and control spray drying inlet temperature, exit temperature, solvent evaporation capacity, can obtain different particle diameters, different specifications, possess the aluminium nitride microcapsule of certain performance difference to adapt to different demands.
The present application is further illustrated below with reference to specific examples. It should be understood that these examples are for illustrative purposes only and are not intended to limit the scope of the present application. The experimental methods of the following examples, which are not specified under specific conditions, are generally determined according to national standards. If there is no corresponding national standard, it is carried out according to the universal international standard, the conventional conditions, or the conditions recommended by the manufacturer.
Example 1
An aluminum nitride microcapsule and a preparation method thereof are characterized by comprising the following steps:
(1) Selecting raw materials: weighing 100 parts of aluminum nitride powder, 5 parts of polyvinylpyrrolidone, 2 parts of polyethylene glycol and 100 parts of absolute ethyl alcohol according to parts by mass;
(2) Preparing aluminum nitride:
mixing aluminum nitride powder, polyvinylpyrrolidone, polyethylene glycol and absolute ethyl alcohol, then grinding by using a planetary ball mill and zirconia grinding beads, controlling the ball-material ratio to be 10;
adding the slurry into a pressure type spray drying tower which takes nitrogen airflow as a heat source, wherein the feeding amount is 1.5L/h, the inlet temperature is 160 ℃, the outlet temperature is 90 ℃, and the pressure is 0.08MPa, and drying and forming to obtain spherical aluminum nitride microcapsules;
(3) And (4) performance testing: the SEM result of the spherical aluminum nitride microcapsules is shown in FIG. 1, and the average particle size is 80 μm, and the apparent density is 1.3g/cm 3 Tap density of 1.5g/cm 3 The repose angle was 34 °, and XRD was measured after being left in a natural environment for 10 days, and the results are shown in fig. 2, which indicates that it has a good hydrolysis resistance. In contrast, the bulk density of the aluminum nitride powder raw material was 0.35g/cm 3 The tap density is 0.60g/cm 3 The angle of repose is 45 °. Thus, the aluminum nitride microcapsule of the invention has better hydrolysis resistance and fluidity.
Example 2
An aluminum nitride microcapsule and a preparation method thereof are characterized by comprising the following steps:
(1) Selecting raw materials: weighing 100 parts of aluminum nitride powder, 5 parts of polyacrylic acid, 0.5 part of hexadecyl trimethyl ammonium bromide, 100 parts of absolute ethyl alcohol, 5 parts of yttrium oxide and 1 part of cerium oxide according to the parts by mass;
(2) Preparing aluminum nitride:
mixing aluminum nitride powder, polyacrylic acid, hexadecyl trimethyl ammonium bromide, absolute ethyl alcohol, yttrium oxide and cerium oxide, grinding by using a pot grinding ball mill and zirconium oxide grinding beads, controlling the ball-material ratio to be 20;
adding the slurry into a centrifugal spray drying tower which takes nitrogen gas flow as a heat source, wherein the feeding amount is 5.0L/h, the inlet temperature is 140 ℃, the outlet temperature is 80 ℃, and drying and forming to obtain spherical aluminum nitride microcapsules;
(3) And (3) performance testing: the average particle diameter of the spherical aluminum nitride microcapsule is 60 mu m, and the apparent density is 1.3g/cm 3 The tap density is 1.4g/cm 3 The angle of repose is 36 °.
Example 3
An aluminum nitride microcapsule and a preparation method thereof are characterized by comprising the following steps:
(1) Selecting raw materials: weighing 100 parts of aluminum nitride powder, 0.5 part of aluminum phosphate, 2 parts of aluminum dihydrogen phosphate, 10 parts of polyacrylic acid, 2 parts of polyethylene glycol and 200 parts of absolute ethyl alcohol in parts by mass;
(2) Preparing aluminum nitride:
mixing aluminum nitride powder, aluminum phosphate, aluminum dihydrogen phosphate, polyurethane, polyethylene glycol and absolute ethyl alcohol, grinding by using a horizontal sand mill and zirconia grinding beads, wherein the average grain diameter of the grinding beads is 0.5mm, the filling rate of a grinding cavity is 50%, circulating for 50 times at the rotating speed of 2700r/min, discharging, and filtering to obtain slurry;
adding the slurry into a pressure type spray drying tower which takes nitrogen gas flow as a heat source, wherein the feeding amount is 0.5L/h, the inlet temperature is 140 ℃, the outlet temperature is 70 ℃, and the pressure is 0.4MPa, and drying and forming to obtain spherical aluminum nitride microcapsules;
(3) And (3) performance testing: the spherical aluminum nitride microcapsules had an average particle diameter of 8 μm and a bulk density of 0.5g/cm 3 Tap density of 0.7g/cm 3 The angle of repose is 42 °.
Example 4
An aluminum nitride microcapsule and a preparation method thereof are characterized by comprising the following steps:
(1) Selecting raw materials: weighing 100 parts of aluminum nitride powder, 2 parts of aluminum phosphate, 3 parts of aluminum dihydrogen phosphate, 15 parts of polyurethane, 10 parts of polypropylene oxide, 2 parts of alumina, 3 parts of zirconia and 200 parts of absolute ethyl alcohol according to parts by mass;
(2) Preparing aluminum nitride:
mixing aluminum nitride powder, aluminum phosphate, aluminum dihydrogen phosphate, polyurethane, polypropylene oxide, alumina, zirconia and absolute ethyl alcohol, grinding by using a horizontal sand mill and zirconia grinding beads, wherein the average grain diameter of the grinding beads is 0.5mm, the filling rate of a grinding cavity is 60%, circulating for 60 times at the rotating speed of 2500r/min, discharging and filtering to obtain slurry;
adding the slurry into a pressure type spray drying tower which takes nitrogen airflow as a heat source, wherein the feeding amount is 1.5L/h, the inlet temperature is 180 ℃, the outlet temperature is 100 ℃, and the pressure is 0.08MPa, and drying and forming to obtain spherical aluminum nitride microcapsules;
(3) And (3) performance testing: the average particle diameter of the spherical aluminum nitride microcapsule is 100 mu m, and the apparent density is 1.5g/cm 3 The tap density is 1.6g/cm 3 The angle of repose is 32 °.
Example 5
An aluminum nitride microcapsule and a preparation method thereof are characterized by comprising the following steps:
(1) Selecting raw materials: weighing 100 parts of aluminum nitride powder, 2 parts of polyvinyl butyral, 0.5 part of hexadecyl trimethyl ammonium bromide, 200 parts of absolute ethyl alcohol, 5 parts of yttrium oxide and 1 part of cerium oxide according to the mass parts;
(2) Preparing aluminum nitride:
mixing aluminum nitride powder, polyvinyl butyral, hexadecyl trimethyl ammonium bromide, absolute ethyl alcohol, yttrium oxide and cerium oxide, grinding by using a tank grinding ball mill and zirconium oxide grinding beads, controlling the ball-material ratio to be 3, controlling the filling rate of a ball-milling tank to be 30%, ball-milling for 15 hours at the rotating speed of 100r/min, and filtering to obtain slurry;
adding the slurry into a centrifugal spray drying tower which takes nitrogen gas flow as a heat source, wherein the feeding amount is 10L/h, the inlet temperature is 300 ℃, the outlet temperature is 150 ℃, and drying and forming are carried out to obtain spherical aluminum nitride microcapsules;
(3) And (4) performance testing: the spherical aluminum nitride microcapsules had an average particle diameter of 30 μm and a bulk density of 0.8g/cm 3 The tap density is 1.0g/cm 3 The angle of repose is 40 °.
Comparative example 1
The polyvinylpyrrolidone and the polyethylene glycol in the embodiment 1 are eliminated, and the rest is the same as the embodiment 1;
the obtained spherical aluminum nitride microcapsule has an average particle diameter of 1.5 μm and a bulk density of 0.38g/cm 3 The tap density is 0.60g/cm 3 The angle of repose is 45 °.
Comparative example 2
The atomization of the slurry into droplets in example 1 was changed to: placing the slurry in a tray, drying for 24 hours at 80 ℃ by using vacuum drying, taking out materials after cooling, wherein the materials contain blocky materials, dry-grinding for 0.5 hour by using a ball mill, scattering the materials, and then screening to obtain aluminum nitride microcapsules, wherein the rest is the same as that in the embodiment 1;
the obtained aluminum nitride microcapsules are mostly irregular oval-shaped, and the edge forms are different.
In conclusion, the spherical aluminum nitride microcapsule powder prepared by the invention has higher apparent density and better fluidity, and is convenient for practical application of aluminum nitride. The microcapsule of the invention is spherical, has better fluidity and low grain diameter, has better compactness than aluminum nitride powder when being applied to ceramic compression molding, requires lower sintering temperature, and forms finer ceramic grains with more excellent performance. The aluminum nitride microcapsule has good fluidity and good hydrolysis resistance, has the advantages of uniform filling, good compatibility, difficult migration and the like when being added into a polymer matrix material, and has certain application prospect in the preparation of polymer composite materials with high heat conduction, heat resistance, enhanced mechanical properties, friction resistance and the like. The method adopts a spray drying granulation method, has low cost, is suitable for large-scale production, can prepare the aluminum nitride microcapsules with different sizes, different components, different specifications and certain performance difference by regulating and controlling preparation conditions according to different application fields, and expands the refined application direction of the aluminum nitride. The invention has the advantages of good product performance, short production flow, recoverable solvent, low production cost, low carbon, environmental protection, high automation degree and the like, and accords with the development trend of current energy conservation and environmental protection.
Various embodiments of the present application may exist in a range of forms; it should be understood that the description in range format is merely for convenience and brevity and should not be construed as an inflexible limitation on the scope of the application; accordingly, the described range descriptions should be considered to have specifically disclosed all the possible sub-ranges as well as individual numerical values within that range. For example, it is contemplated that the description of a range from 1 to 6 has specifically disclosed sub-ranges, such as from 1 to 3, from 1 to 4, from 1 to 5, from 2 to 4, from 2 to 6, from 3 to 6, etc., as well as single numbers within the stated range, such as 1, 2, 3, 4, 5, and 6, as applicable regardless of the range. In addition, whenever a numerical range is indicated herein, it is meant to include any number (fractional or integer) recited within the range so indicated.
In this application, where the context requires no explicit explanation, the use of directional words such as "upper" and "lower" in particular refers to the direction of the drawing in the figures. In addition, in the description of the present specification, the terms "include", "includes" and the like mean "including but not limited to". In this document, relational terms such as "first" and "second", and the like, may be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Herein, "and/or" describes an association relationship of associated objects, meaning that there may be three relationships, e.g., a and/or B, may mean: a is present alone, A and B are present simultaneously, and B is present alone. Wherein A and B can be singular or plural. As used herein, "at least one" means one or more, "a plurality" means two or more. "at least one," "at least one of the following," or similar expressions, refer to any combination of these items, including any combination of the singular or plural items. For example, "at least one (a), b, or c", or "at least one (a), b, and c", may each represent: a, b, c, a-b (i.e. a and b), a-c, b-c, or a-b-c, wherein a, b, and c can be single or multiple respectively.
The above description is merely exemplary of the present application and is presented to enable those skilled in the art to understand and practice the present application. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the application. Thus, the present application is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.
Claims (10)
1. The aluminum nitride microcapsule is characterized by comprising a core and a shell, wherein the shell is a spherical water-resistant high polymer material, the core is powder coated in the shell, and the components of the powder comprise aluminum nitride particles.
2. The aluminum nitride microcapsule according to claim 1, wherein the aluminum nitride microcapsule has an aluminum nitride content of 70 to 99% by mass.
3. The aluminum nitride microcapsule according to claim 1, wherein the particle size of the aluminum nitride microcapsule is 5 to 100 μm.
4. The aluminum nitride microcapsule according to claim 1, wherein the aluminum nitride microcapsule comprises the following raw materials: aluminum nitride, a water-resistant polymer material and an auxiliary agent.
5. The aluminum nitride microcapsule according to claim 4, wherein the water-resistant polymer material comprises at least one of phenolic resin, epoxy resin, polyvinyl butyral, polyvinyl alcohol, polyvinyl pyrrolidone, polyacrylic acid, polyurethane, and ethyl cellulose.
6. The aluminum nitride microcapsule according to claim 4, wherein the auxiliary agent comprises a dispersant and a modifier; and/or
The dispersant comprises at least one of cetyl trimethyl ammonium bromide, polyethylene glycol, polypropylene oxide and sodium dodecyl sulfate; and/or
The modifier comprises at least one of yttrium oxide, cerium oxide, aluminum oxide, zirconium oxide, molybdenum disulfide, aluminum phosphate and aluminum dihydrogen phosphate.
7. A process for the preparation of aluminium nitride microcapsules according to any one of claims 1 to 6, characterized in that it comprises:
mixing and grinding aluminum nitride powder, a water-resistant polymer material, an auxiliary agent and an organic solvent, and filtering to obtain slurry;
and atomizing the slurry into liquid drops, and drying the liquid drops to obtain the aluminum nitride microcapsule.
8. The method of manufacturing according to claim 7, further comprising: and screening the aluminum nitride microcapsules by using a grading sieve to obtain the aluminum nitride microcapsules with different particle sizes.
9. The method of claim 7, wherein the milling process parameters include: the grinding medium is at least one of zirconia grinding balls, alumina grinding balls and aluminum nitride grinding balls, the mass ratio of the ball material is (3-30): 1, and the solid content of the grinding slurry is 30-70%.
10. The method of claim 7, wherein the drying process parameters include: the inlet temperature is 100-300 deg.C, the outlet temperature is 50-150 deg.C, and the solvent evaporation amount is 0.5-100kg/h.
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