CN114958265A - Method for improving electromagnetic shielding performance of pouring sealant for magnetic suspension motor and pouring sealant - Google Patents
Method for improving electromagnetic shielding performance of pouring sealant for magnetic suspension motor and pouring sealant Download PDFInfo
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- CN114958265A CN114958265A CN202210634832.3A CN202210634832A CN114958265A CN 114958265 A CN114958265 A CN 114958265A CN 202210634832 A CN202210634832 A CN 202210634832A CN 114958265 A CN114958265 A CN 114958265A
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- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09J—ADHESIVES; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; USE OF MATERIALS AS ADHESIVES
- C09J163/00—Adhesives based on epoxy resins; Adhesives based on derivatives of epoxy resins
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- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09J—ADHESIVES; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; USE OF MATERIALS AS ADHESIVES
- C09J11/00—Features of adhesives not provided for in group C09J9/00, e.g. additives
- C09J11/02—Non-macromolecular additives
- C09J11/04—Non-macromolecular additives inorganic
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- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09J—ADHESIVES; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; USE OF MATERIALS AS ADHESIVES
- C09J9/00—Adhesives characterised by their physical nature or the effects produced, e.g. glue sticks
- C09J9/02—Electrically-conducting adhesives
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- 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
- H05K9/0073—Shielding materials
- H05K9/0081—Electromagnetic shielding materials, e.g. EMI, RFI shielding
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
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- C08K2201/001—Conductive additives
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- C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
- C08K2201/00—Specific properties of additives
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- C08K2201/005—Additives being defined by their particle size in general
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
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- C08K2201/011—Nanostructured additives
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- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
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- C08L2203/00—Applications
- C08L2203/20—Applications use in electrical or conductive gadgets
- C08L2203/206—Applications use in electrical or conductive gadgets use in coating or encapsulating of electronic parts
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
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Abstract
A method for improving electromagnetic shielding performance of a pouring sealant for a magnetic suspension motor and the pouring sealant adopt a high-molecular resin pouring sealant, mixed modified graphite is added into the high-molecular resin pouring sealant, and the electromagnetic shielding performance of the pouring sealant is improved by using the mixed modified graphite. The mixed modified graphite optimizes the pouring sealant electromagnetic shielding system through selection and treatment of the mixed modified graphite material, and improves the electromagnetic shielding effect and the heat conduction performance of the pouring sealant of the magnetic suspension motor. According to the invention, the electromagnetic shielding performance of the potting adhesive for the magnetic suspension motor is improved by using the mixed modified graphite, and the electric and heat conducting channel with excellent effect can be built together in a mode of mutual matching of large and small particles, so that the electromagnetic shielding effect and the heat conducting performance are excellent.
Description
Technical Field
The invention relates to a method for manufacturing pouring sealant and the pouring sealant thereof, in particular to a method for improving electromagnetic shielding performance of the pouring sealant of a magnetic suspension motor and the pouring sealant; the method for improving the electromagnetic shielding performance of the pouring sealant of the magnetic suspension motor and the pouring sealant can further improve the electromagnetic shielding performance of the magnetic suspension motor; belongs to the technical field of polymer pouring sealant preparation.
Background
The epoxy pouring sealant is widely applied to the field of motor packaging because of good adhesive property, insulating property and weather resistance, but in practical application, the epoxy pouring sealant is limited to use because of the problems of high rigidity, easy brittleness, poor high temperature resistance, poor temperature and impact resistance and the like.
The magnetic suspension motor is a special motor with a stator and a rotor operating in a non-contact manner, and is widely applied to occasions such as a magnetic suspension train, a magnetic suspension bearing, magnetic suspension wind power generation, a magnetic suspension artificial heart blood pump and the like. In practical application, the magnetic suspension motor requires sealing protection of electronic components, and adverse factors outside the motor, such as moisture, dust, salt mist and the like, are isolated from the motor. However, inside some special components, electromagnetic signals need to be effectively protected to prevent signal loss, and electromagnetic shielding potting adhesive needs to be selected for sealing protection. Meanwhile, the magnetic suspension motor generally has relatively high power and more obvious heating phenomenon, so that higher requirements are provided for the heat conductivity and heat resistance of the sealing material.
The epoxy pouring sealant using epoxy resin as a matrix can effectively protect a motor and is widely applied to sealing protection of a conventional motor, but in the field of electromagnetic shielding pouring sealants, the epoxy pouring sealant has two disadvantages, one is that more conductive materials are generally required to be added into an electromagnetic shielding material, and the compatibility of the conventional conductive materials and the epoxy resin is poor, so that the conventional conductive materials cannot achieve higher filling amount, and the electromagnetic shielding effect is poor. Secondly, the epoxy pouring sealant with high filling amount is often brittle, and the high and low temperature resistance is poor. In addition, the high temperature resistance of the epoxy resin is relatively poor, so that the development and application of the electromagnetic shielding epoxy adhesive are greatly limited. However, compared with other high polymer materials, the epoxy pouring sealant has relatively good adhesive property, mechanical property and weather resistance, so that the epoxy pouring sealant has great significance for researching high temperature resistance and high cracking resistance electromagnetic shielding epoxy pouring sealants. There is a need for improvement in this regard.
The search through inquiry is used for finding the same technical report, only technical literatures in related fields are provided, and the most similar technical reports are formed by the following steps:
1. the patent number is CN201710631395.9, the name is "a conduction interference resistant pouring sealant and a use method and application thereof", the applicant is: the invention patent of Shenzhen Tianding new material Limited company discloses a conduction interference resistant pouring sealant and a use method and application thereof, wherein the pouring sealant consists of a component A and a component B; wherein, the component A comprises: 20-45 parts of vinyl-terminated silicone oil, 40-70 parts of heat conducting filler, 2-7 parts of hydrogen-containing silicone oil, 2-8 parts of Ni/graphite composite material and 0.005-0.0075 parts of inhibitor; the component B comprises: 20-45 parts of vinyl-terminated silicone oil, 30-70 parts of heat conducting filler, 2-8 parts of Ni/graphite composite material and 0.10-0.15 part of catalyst. Although the patent refers to a graphite composite material, the patent does not belong to epoxy pouring sealant, and only emphasizes that the graphite composite material is a Ni/graphite composite material, and the Ni/graphite composite material is prepared by putting graphite into a nickel plating solution for nickel plating; however, the compatibility of the Ni/graphite composite material with epoxy resin potting adhesive of a magnetic suspension motor is poor, and direct application can result in that higher filling amount cannot be achieved, thereby resulting in poor electromagnetic shielding effect.
2. The patent number is CN202210098546.X, the name is "a pouring sealant and its preparation method and application", applicant is: the patent application discloses a pouring sealant and a preparation method and application thereof. The pouring sealant comprises a component A and a component B, wherein the component A comprises epoxy resin, a diluent, spherical modified filler and flake silver powder; the component B comprises a curing agent and a curing accelerator; the spherical modified filler comprises a glass powder core body, and a graphene layer and a silver deposition layer which sequentially coat the glass powder core body. The patent proposes that spherical modified filler and flake silver powder are added into a system to improve the electric conduction and heat conduction performance of the pouring sealant, the heat conduction coefficient is 1.6W/(m.k) at the lowest, the resistivity is 6 multiplied by 10 < -4 > (omega.cm) at the highest, and the pouring sealant can be used for packaging electronic components; although the patent belongs to epoxy pouring sealant, the problem of electromagnetic shielding is not considered, and the added graphene is mainly used for improving the heat-conducting property.
3. The patent number is CN201911282599.1, entitled "high heat conduction magnetic shield high strength waterproof pouring sealant and preparation method thereof", the applicant is: zhengsha invention patent application discloses a high-heat-conductivity magnetic-shielding high-strength waterproof pouring sealant, which comprises the following raw materials in parts by weight: 25-35 parts of aluminum oxide, 5-15 parts of silicon carbide, 5-35 parts of aluminum nitride and one or more of aluminum oxide, silicon carbide and aluminum nitride; 1-8 parts of flaky nickel powder, 3-15 parts of hydroxyl iron powder, 2-40 parts of ferrum-silicon-aluminum, 10-38 parts of ferrum-nickel powder and one or more of the components; 5-40 parts of graphene, 1-9 parts of graphite powder and 3-18 parts of graphite glue powder; 2-7 parts of epoxy resin and 1-9 parts of polyurethane; the invention also provides a preparation method of the high-heat-conductivity magnetic-shielding high-strength waterproof pouring sealant, which comprises the following steps; s1, crushing; s2, mixing; s3, blending, wherein although the patent also provides graphene and graphite powder, no specific modified graphite powder is provided, so that the compatibility with epoxy resin pouring sealant is poor, and the direct application can cause the problem that the filling amount cannot be high, thereby causing the problem of poor electromagnetic shielding effect.
Although the above patents refer to graphite or graphene, the electromagnetic shielding problem of the epoxy potting adhesive in the prior art is not substantially solved, and the specific mixing manner of graphite and graphene is not proposed, so that the problems mentioned above still exist, and thus there is a need for improvement.
Disclosure of Invention
The technical problem to be solved by the invention is to overcome the defects and shortcomings mentioned in the background technology and provide a method for improving the electromagnetic shielding performance of the potting adhesive of the magnetic suspension motor. The method for improving the electromagnetic shielding performance of the potting adhesive for the magnetic suspension motor can greatly improve the compatibility of the graphite powder and the epoxy resin potting adhesive, so that the filling amount of the graphite powder is improved, and the effect of improving the electromagnetic shielding performance of the potting adhesive is achieved.
The invention also aims to provide the potting adhesive for the magnetic suspension motor with the performance.
The invention is mainly realized by the following technical scheme: a method for improving electromagnetic shielding performance of a pouring sealant for a magnetic suspension motor and the pouring sealant adopt a high-molecular resin pouring sealant, mixed modified graphite is added into the high-molecular resin pouring sealant, and the electromagnetic shielding performance of the pouring sealant is improved by using the mixed modified graphite.
Furthermore, the mixed modified graphite optimizes the electromagnetic shielding system of the pouring sealant by selecting and processing the mixed modified graphite material, so that the electromagnetic shielding effect and the heat conduction performance of the pouring sealant of the magnetic suspension motor are improved.
Furthermore, the selection and treatment of the mixed modified graphite material are used for optimizing the electromagnetic shielding system of the potting adhesive, the modified graphite and the graphene are mixed to form the mixed modified graphite material, and the electromagnetic shielding effect and the heat conducting property of the potting adhesive of the magnetic suspension motor are improved by using the mixed modified graphite material formed by mixing the modified graphite and the graphene.
Further, modified graphite and graphite alkene mix and form mixed modified graphite material adopt the modified electrically conductive graphite material of large granule to pack as the main part, the nanometer graphite alkene of the super high heat conduction of cooperation small granule is for packing, adopts the mode that big or small granule interworked, builds the fabulous electrically conductive heat conduction passageway of effect jointly to provide fabulous electromagnetic shield effect and heat conductivility.
Furthermore, the large-particle conductive graphite material is modified micron-sized conductive graphite powder, and the particle size is 1-100 um.
Further, the modified micron-sized conductive graphite powder is subjected to hydroxylation treatment to obtain hydroxylated graphite particles.
Further, the preparation method of the modified micron-sized conductive graphite powder is as follows:
(1) preparing raw materials, and carrying out hydroxylation treatment on 10-50 parts by mass of conductive graphite particles to obtain hydroxylated graphite particles;
(2) and mixing and reacting the hydroxylated graphite particles with 0.1-10 parts by mass of epoxy siloxane coupling agent for 1-5 hours completely to obtain the modified conductive graphite particles.
Further, the particle size of the graphene is 1-100 nm.
The pouring sealant prepared by the method for improving the electromagnetic shielding performance of the pouring sealant for the magnetic suspension motor is a high-molecular resin pouring sealant, and is characterized in that: the polymer resin pouring sealant contains mixed modified graphite.
Further, the mixed modified graphite is a mixed modified graphite material formed by mixing modified graphite and graphene.
The invention has the beneficial effects that:
the mixed modified graphite is adopted, the electromagnetic shielding performance of the pouring sealant is improved by combining the characteristics of different graphites, and the electromagnetic shielding potting sealant has the characteristics of good electromagnetic shielding effect, low manufacturing cost, simple manufacturing method and the like. Has the following advantages:
1. according to the invention, aiming at high shielding performance and high heat conduction performance, a heat conduction and electric conduction filler system is designed and optimized, the electric conduction graphite material is used as a large-particle main filler, the ultrahigh heat conduction nano graphene is used as a small-particle filler, and a large-particle and small-particle mutually matched mode is adopted to jointly build an electric conduction and heat conduction channel with excellent effect, so that excellent electromagnetic shielding effect and heat conduction performance are provided.
2. According to the invention, two graphite materials of graphite powder and graphene with low cost are mixed, the characteristics of different diameters of graphite and graphene are utilized, and by reasonably configuring large and small particles, a good electromagnetic shielding effect can be obtained, and the production and manufacturing cost can be greatly reduced.
3. The technical core of the invention is that aiming at the characteristic that the compatibility of the conductive graphite and the epoxy resin is poor, the surface of the conductive graphite is modified by the epoxy siloxane, so that the compatibility of the conductive graphite and the epoxy resin is effectively improved, and the addition proportion of the conductive graphite is improved.
4. The method is simple and practical after the hydroxylated graphite particles are obtained by carrying out hydroxylation modification treatment on the surface of graphite and then mixing the hydroxylated graphite particles with the epoxy siloxane coupling agent.
5. The invention only treats the surface layer of the graphite, thus not affecting the whole conductive performance of the graphite and the electromagnetic shielding effect of the graphite, and the graphite powder can greatly save the manufacturing energy and reduce the manufacturing cost.
Detailed Description
For a further understanding of the invention, reference will now be made to the preferred embodiments of the invention by way of example, and it is to be understood that the description is intended to further illustrate features and advantages of the invention, and not to limit the scope of the claims.
Example 1
A preparation method of a pouring sealant for a magnetic suspension motor; a, B two groups of epoxy resins are adopted to prepare the pouring sealant, and the mixed graphite composite material is added into the pouring sealant, so that the electromagnetic shielding performance of the pouring sealant is improved through the mixed graphite composite material; the preparation method comprises the following steps:
(1) preparation of modified conductive graphite particles
10-50 parts by mass of conductive graphite powder with the particle size of 1-100 um is selected as a modified graphite base material, and surface hydroxylation treatment is carried out on the conductive graphite powder to obtain hydroxylated modified conductive graphite particles.
The surface hydroxylation treatment of the conductive graphite powder comprises the steps of washing the conductive graphite powder with deionized water, drying, mixing with alkaline compound solid powder according to the mass ratio of 1: 10-1: 30, and grinding to hydroxylate the surface of the conductive graphite powder; and then washing the ground conductive graphite powder mixture to be neutral by using deionized water, and drying to obtain the hydroxylated modified conductive graphite particles.
The hydroxyl group introduced into the surface of the graphite powder can increase the surface free energy of the polymer, improve the surface performance of the polymer and react with various compounds, so that the affinity of the graphite powder and epoxy resin is improved, the compatibility of the conductive graphite and the epoxy resin is effectively improved, the addition proportion of the conductive graphite is improved, and a good electromagnetic shielding effect can be obtained.
(2) Preparation of epoxy resin A component
Adding 70 parts by mass of bisphenol S type epoxy resin into a high-speed dispersion machine kettle, sequentially adding 15 parts by mass of dicyclopentadiene phenol type epoxy resin, 20 parts by mass of benzyl glycidyl ether and 20 parts by mass of nitrile rubber modified epoxy resin, then adding 2 parts by mass of fumed silica thixotropic agent, 1 part by mass of bentonite thixotropic agent and 200 parts by mass of modified conductive graphite particles, and dispersing at a high speed for 10 min at the rotating speed of 2500 rpm; and then adding 30 parts of 10nm nano graphene, and dispersing at a high speed for 30 min to obtain the epoxy resin A component.
(3) Preparation of curing agent B component
And stirring 100 parts by mass of polyetheramine and 15 parts by mass of boron trifluoride accelerator in a stirring kettle for 25 min at the rotating speed of 50 rpm to obtain the epoxy resin B component.
And (3) accurately weighing 50g of the component A and 5g of the component B, and stirring for 5min to prepare the pouring sealant.
The properties of the epoxy potting compound obtained were tested and the results are shown in table 1.
Example 2
A preparation method of a pouring sealant for a magnetic suspension motor; a, B two groups of epoxy resins are adopted to prepare the pouring sealant, and the mixed graphite composite material is added into the pouring sealant, so that the electromagnetic shielding performance of the pouring sealant is improved through the mixed graphite composite material; the preparation method comprises the following steps:
(1) preparation of modified conductive graphite particles
10-50 parts by mass of conductive graphite powder with the particle size of 1-100 um is selected as a modified graphite base material, and surface hydroxylation treatment is carried out on the conductive graphite powder to obtain hydroxylated modified conductive graphite particles.
Conducting surface hydroxylation treatment on the conductive graphite powder, namely conducting ultrasonic treatment on the conductive graphite powder in distilled water to obtain a uniformly dispersed graphene oxide aqueous solution; adding hydrazine hydrate and ammonia water, and condensing and refluxing in an oil bath to obtain a turbid liquid of graphite powder and water; adding aminophenyl alcohol and isoamyl nitrite, condensing and refluxing to obtain a hydroxyl fossil ink solution; filtering to obtain a neutral solution; and (4) freeze-drying to obtain the hydroxylated modified conductive graphite particles with controllable conductive performance.
(2) Preparation of epoxy resin A component
Adding 80 parts by mass of bisphenol S type epoxy resin into a high-speed dispersion machine kettle, sequentially adding 10 parts by mass of phenol novolac epoxy resin, 20 parts by mass of benzyl glycidyl ether and 20 parts by mass of silicone rubber modified epoxy resin, then adding 2 parts by mass of fumed silica thixotropic agent, 1 part by mass of bentonite thixotropic agent and 250 parts by mass of modified conductive graphite particles, and dispersing at a high speed for 10 min at the rotating speed of 2500 rpm; and then adding 20 parts of 10nm nano graphene, and dispersing at a high speed for 30 min to obtain the epoxy resin A component.
(3) Preparation of curing agent B component
And stirring 70 parts by mass of polyetheramine and 15 parts by mass of boron trifluoride accelerator in a stirring kettle for 25 min at the rotating speed of 50 rpm to obtain the epoxy resin B component.
And (3) accurately weighing 50g of the component A and 5g of the component B, and stirring for 5min to prepare the pouring sealant.
The properties of the epoxy potting compound obtained were tested and the results are shown in table 1.
Example 3
A preparation method of a pouring sealant for a magnetic suspension motor; a, B two groups of epoxy resins are adopted to prepare the pouring sealant, and the mixed graphite composite material is added into the pouring sealant, so that the electromagnetic shielding performance of the pouring sealant is improved through the mixed graphite composite material; the preparation method comprises the following steps:
(1) preparation of modified conductive graphite particles
10-50 parts by mass of conductive graphite powder with the particle size of 1-100 um is selected as a modified graphite base material, and surface hydroxylation treatment is carried out on the conductive graphite powder to obtain hydroxylated modified conductive graphite particles.
The surface hydroxylation treatment of the conductive graphite powder comprises the steps of washing the conductive graphite powder with deionized water, drying, mixing with alkaline compound solid powder according to the mass ratio of 1: 10-1: 30, and grinding to hydroxylate the surface of the conductive graphite powder; and then washing the ground conductive graphite powder mixture to be neutral by using deionized water, and drying to obtain the hydroxylated modified conductive graphite particles.
(2) Preparation of epoxy resin A component
Adding 90 parts by mass of bisphenol S type epoxy resin into a high-speed dispersion machine kettle, adding 15 parts by mass of o-cresol formaldehyde epoxy resin, 30 parts by mass of benzyl glycidyl ether and 20 parts by mass of natural rubber modified epoxy resin, adding 3 parts by mass of fumed silica thixotropic agent, 1.5 parts by mass of bentonite thixotropic agent and 200 parts by mass of modified conductive graphite particles, and dispersing at a high speed for 10 min at the rotating speed of 2500 rpm; and then adding 20 parts by mass of 10nm nano graphene, and dispersing at high speed for 30 min.
(3) Preparation of curing agent B component
The mixture of 110 parts by mass of polyetheramine and 25 parts by mass of boron trifluoride accelerator was stirred in a stirred tank for 25 min at a speed of 50 rpm.
And (3) accurately weighing 50g of the component A and 5g of the component B, and stirring for 5min to prepare the pouring sealant.
The properties of the epoxy potting compound obtained were tested and the results are shown in table 1.
The above description of the embodiments is only intended to facilitate the understanding of the method of the invention and its core idea. It should be noted that, for those skilled in the art, it is possible to make various improvements and modifications to the present invention without departing from the principle of the present invention, and those improvements and modifications also fall within the scope of the claims of the present invention.
TABLE 1 Performance test results of epoxy potting adhesive prepared in each example
The invention has the beneficial effects that:
the mixed modified graphite is adopted, the electromagnetic shielding performance of the pouring sealant is improved by combining the characteristics of different graphites, and the electromagnetic shielding potting sealant has the characteristics of good electromagnetic shielding effect, low manufacturing cost, simple manufacturing method and the like. Has the following advantages:
1. according to the invention, aiming at high shielding performance and high heat conduction performance, a heat conduction and electric conduction filler system is designed and optimized, the electric conduction graphite material is used as a large-particle main filler, the ultrahigh heat conduction nano graphene is used as a small-particle filler, and a large-particle and small-particle mutually matched mode is adopted to jointly build an electric conduction and heat conduction channel with excellent effect, so that excellent electromagnetic shielding effect and heat conduction performance are provided.
2. According to the invention, two graphite materials of graphite powder and graphene with low cost are mixed, the characteristics of different diameters of graphite and graphene are utilized, and by reasonably configuring large and small particles, a good electromagnetic shielding effect can be obtained, and the production and manufacturing cost can be greatly reduced.
3. The technical core of the invention is that aiming at the characteristic that the compatibility of the conductive graphite and the epoxy resin is poor, the surface of the conductive graphite is modified by the epoxy siloxane, so that the compatibility of the conductive graphite and the epoxy resin is effectively improved, and the addition proportion of the conductive graphite is improved.
4. The method is simple and practical after the hydroxylated graphite particles are obtained by carrying out hydroxylation modification treatment on the surface of graphite and then mixing the hydroxylated graphite particles with the epoxy siloxane coupling agent.
The invention only treats the surface layer of the graphite, thus not affecting the whole conductive performance of the graphite and the electromagnetic shielding effect of the graphite, and the graphite powder can greatly save the manufacturing energy and reduce the manufacturing cost.
Claims (10)
1. A method for improving electromagnetic shielding performance of a potting adhesive of a magnetic suspension motor is characterized by comprising the following steps: the electromagnetic shielding performance of the pouring sealant is improved by adopting the high-molecular resin pouring sealant and adding the mixed modified graphite into the high-molecular resin pouring sealant.
2. The method for improving the electromagnetic shielding performance of the potting adhesive for the magnetic suspension motor and the potting adhesive as claimed in claim 1, wherein the method comprises the following steps: the mixed modified graphite optimizes the pouring sealant electromagnetic shielding system through selection and treatment of mixed modified graphite materials, and improves the electromagnetic shielding effect and the heat conduction performance of the pouring sealant of the magnetic suspension motor.
3. The method for improving the electromagnetic shielding performance of the potting adhesive for the magnetic suspension motor and the potting adhesive as claimed in claim 1, wherein the method comprises the following steps: the electromagnetic shielding system of the potting adhesive is optimized by selecting and processing the mixed modified graphite material, namely the mixed modified graphite material is formed by mixing the modified graphite and the graphene, and the electromagnetic shielding effect and the heat conducting property of the potting adhesive of the magnetic suspension motor are improved by using the mixed modified graphite material formed by mixing the modified graphite and the graphene.
4. The method for improving the electromagnetic shielding performance of the potting adhesive for the magnetic suspension motor and the potting adhesive as claimed in claim 3, wherein the method comprises the following steps: modified graphite and graphite alkene mix and form mixed modified graphite material adopt the modified electrically conductive graphite material of large granule to pack as the main part, the nanometer graphite alkene of the super high heat conduction of cooperation small granule adopts the mode of big or small granule to mutually support for packing, builds the electrically conductive heat conduction passageway that the effect is fabulous jointly to provide fabulous electromagnetic shield effect and heat conductivility.
5. The method for improving the electromagnetic shielding performance of the potting adhesive for the magnetic suspension motor and the potting adhesive as claimed in claim 4, wherein the method comprises the following steps: the large-particle conductive graphite material is modified micron-sized conductive graphite powder, and the particle size is 1-100 um.
6. The method for improving the electromagnetic shielding performance of the potting adhesive for the magnetic suspension motor and the potting adhesive as claimed in claim 3, wherein the method comprises the following steps: the modified graphite is subjected to hydroxylation treatment to obtain hydroxylated graphite particles.
7. The method for improving the electromagnetic shielding performance of the potting adhesive for the magnetic suspension motor and the potting adhesive as claimed in claim 6, wherein the method comprises the following steps: the preparation method of the modified graphite comprises the following steps:
(1) preparing raw materials, and carrying out hydroxylation treatment on 10-50 parts by mass of conductive graphite particles to obtain hydroxylated graphite particles;
(2) and mixing and reacting the hydroxylated graphite particles with 0.1-10 parts by mass of epoxy siloxane coupling agent for 1-5 hours completely to obtain the modified conductive graphite particles.
8. The method for improving the electromagnetic shielding performance of the potting adhesive for the magnetic suspension motor and the potting adhesive as claimed in claim 4, wherein the method comprises the following steps: the particle size of the graphene is 1-100 nm.
9. The pouring sealant prepared by the method for improving the electromagnetic shielding performance of the pouring sealant for the magnetic suspension motor in claim 1 is a high-molecular resin pouring sealant, and is characterized in that: the polymer resin pouring sealant contains mixed modified graphite.
10. The potting adhesive of claim 8, wherein: the mixed modified graphite is a mixed modified graphite material formed by mixing modified graphite and graphene.
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| CN202210634832.3A CN114958265A (en) | 2022-06-07 | 2022-06-07 | Method for improving electromagnetic shielding performance of pouring sealant for magnetic suspension motor and pouring sealant |
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| CN202210634832.3A CN114958265A (en) | 2022-06-07 | 2022-06-07 | Method for improving electromagnetic shielding performance of pouring sealant for magnetic suspension motor and pouring sealant |
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2022
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| CN111040696A (en) * | 2019-12-13 | 2020-04-21 | 郑棚 | High-heat-conductivity magnetic-shielding high-strength waterproof pouring sealant and preparation method thereof |
| CN111892046A (en) * | 2020-06-30 | 2020-11-06 | 重庆交通大学 | Hydroxylated graphene and preparation method and application thereof |
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