CN116285819A - High-wear-resistance alpha-Al 2O3 ceramic particle-containing two-component epoxy resin paste - Google Patents
High-wear-resistance alpha-Al 2O3 ceramic particle-containing two-component epoxy resin paste Download PDFInfo
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- CN116285819A CN116285819A CN202310415397.XA CN202310415397A CN116285819A CN 116285819 A CN116285819 A CN 116285819A CN 202310415397 A CN202310415397 A CN 202310415397A CN 116285819 A CN116285819 A CN 116285819A
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- epoxy resin
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- ceramic
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- 239000003822 epoxy resin Substances 0.000 title claims abstract description 57
- 229920000647 polyepoxide Polymers 0.000 title claims abstract description 57
- 239000000919 ceramic Substances 0.000 title claims abstract description 42
- 239000002245 particle Substances 0.000 title claims abstract description 38
- 238000009826 distribution Methods 0.000 claims abstract description 14
- 239000012188 paraffin wax Substances 0.000 claims abstract description 10
- 239000003795 chemical substances by application Substances 0.000 claims abstract description 7
- 239000003085 diluting agent Substances 0.000 claims abstract description 7
- 239000000203 mixture Substances 0.000 claims abstract description 4
- 239000011248 coating agent Substances 0.000 claims description 11
- 238000000576 coating method Methods 0.000 claims description 11
- 239000007788 liquid Substances 0.000 claims description 9
- 238000002156 mixing Methods 0.000 claims description 9
- CSCPPACGZOOCGX-UHFFFAOYSA-N Acetone Chemical compound CC(C)=O CSCPPACGZOOCGX-UHFFFAOYSA-N 0.000 claims description 6
- YRKCREAYFQTBPV-UHFFFAOYSA-N acetylacetone Chemical compound CC(=O)CC(C)=O YRKCREAYFQTBPV-UHFFFAOYSA-N 0.000 claims description 6
- -1 alicyclic amine Chemical class 0.000 claims description 6
- 239000004841 bisphenol A epoxy resin Substances 0.000 claims description 6
- 239000004842 bisphenol F epoxy resin Substances 0.000 claims description 6
- 239000011362 coarse particle Substances 0.000 claims description 6
- 239000010419 fine particle Substances 0.000 claims description 6
- 239000000843 powder Substances 0.000 claims description 6
- IMNIMPAHZVJRPE-UHFFFAOYSA-N triethylenediamine Chemical compound C1CN2CCN1CC2 IMNIMPAHZVJRPE-UHFFFAOYSA-N 0.000 claims description 6
- JHIVVAPYMSGYDF-UHFFFAOYSA-N cyclohexanone Chemical compound O=C1CCCCC1 JHIVVAPYMSGYDF-UHFFFAOYSA-N 0.000 claims description 5
- 238000010438 heat treatment Methods 0.000 claims description 4
- TXUICONDJPYNPY-UHFFFAOYSA-N (1,10,13-trimethyl-3-oxo-4,5,6,7,8,9,11,12,14,15,16,17-dodecahydrocyclopenta[a]phenanthren-17-yl) heptanoate Chemical compound C1CC2CC(=O)C=C(C)C2(C)C2C1C1CCC(OC(=O)CCCCCC)C1(C)CC2 TXUICONDJPYNPY-UHFFFAOYSA-N 0.000 claims description 3
- 239000004952 Polyamide Substances 0.000 claims description 3
- 229910021626 Tin(II) chloride Inorganic materials 0.000 claims description 3
- GSEJCLTVZPLZKY-UHFFFAOYSA-N Triethanolamine Chemical compound OCCN(CCO)CCO GSEJCLTVZPLZKY-UHFFFAOYSA-N 0.000 claims description 3
- 125000002723 alicyclic group Chemical group 0.000 claims description 3
- 239000004844 aliphatic epoxy resin Substances 0.000 claims description 3
- 150000004982 aromatic amines Chemical class 0.000 claims description 3
- 238000000498 ball milling Methods 0.000 claims description 3
- 238000004140 cleaning Methods 0.000 claims description 3
- ZBCBWPMODOFKDW-UHFFFAOYSA-N diethanolamine Chemical compound OCCNCCO ZBCBWPMODOFKDW-UHFFFAOYSA-N 0.000 claims description 3
- 239000000428 dust Substances 0.000 claims description 3
- 238000000034 method Methods 0.000 claims description 3
- ISWSIDIOOBJBQZ-UHFFFAOYSA-N phenol group Chemical group C1(=CC=CC=C1)O ISWSIDIOOBJBQZ-UHFFFAOYSA-N 0.000 claims description 3
- 229920002647 polyamide Polymers 0.000 claims description 3
- 238000002360 preparation method Methods 0.000 claims description 3
- 235000011150 stannous chloride Nutrition 0.000 claims description 3
- 239000001119 stannous chloride Substances 0.000 claims description 3
- 238000005299 abrasion Methods 0.000 claims description 2
- 229910052751 metal Inorganic materials 0.000 abstract description 4
- 239000002184 metal Substances 0.000 abstract description 4
- 239000000758 substrate Substances 0.000 abstract description 4
- 229920005989 resin Polymers 0.000 abstract description 3
- 239000011347 resin Substances 0.000 abstract description 3
- 239000011159 matrix material Substances 0.000 abstract description 2
- 239000007769 metal material Substances 0.000 abstract 1
- 239000000463 material Substances 0.000 description 8
- 239000010410 layer Substances 0.000 description 7
- 239000000853 adhesive Substances 0.000 description 3
- 230000001070 adhesive effect Effects 0.000 description 3
- 239000003292 glue Substances 0.000 description 3
- 239000000126 substance Substances 0.000 description 3
- AEEAZFQPYUMBPY-UHFFFAOYSA-N [I].[W] Chemical compound [I].[W] AEEAZFQPYUMBPY-UHFFFAOYSA-N 0.000 description 2
- 238000005260 corrosion Methods 0.000 description 2
- 230000007797 corrosion Effects 0.000 description 2
- 230000002035 prolonged effect Effects 0.000 description 2
- 239000002344 surface layer Substances 0.000 description 2
- PNEYBMLMFCGWSK-UHFFFAOYSA-N Alumina Chemical compound [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 description 1
- 239000004593 Epoxy Substances 0.000 description 1
- 230000004075 alteration Effects 0.000 description 1
- 239000002585 base Substances 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 238000004132 cross linking Methods 0.000 description 1
- 125000002243 cyclohexanonyl group Chemical group *C1(*)C(=O)C(*)(*)C(*)(*)C(*)(*)C1(*)* 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000010292 electrical insulation Methods 0.000 description 1
- 229920006335 epoxy glue Polymers 0.000 description 1
- LNEPOXFFQSENCJ-UHFFFAOYSA-N haloperidol Chemical compound C1CC(O)(C=2C=CC(Cl)=CC=2)CCN1CCCC(=O)C1=CC=C(F)C=C1 LNEPOXFFQSENCJ-UHFFFAOYSA-N 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000004382 potting Methods 0.000 description 1
- 238000005245 sintering Methods 0.000 description 1
- 238000002791 soaking Methods 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 229920001187 thermosetting polymer Polymers 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
Images
Classifications
-
- 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
-
- 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
-
- 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
- C08K3/00—Use of inorganic substances as compounding ingredients
- C08K3/18—Oxygen-containing compounds, e.g. metal carbonyls
- C08K3/20—Oxides; Hydroxides
- C08K3/22—Oxides; Hydroxides of metals
- C08K2003/2227—Oxides; Hydroxides of metals of aluminium
-
- 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
- C08K2201/00—Specific properties of additives
- C08K2201/002—Physical properties
- C08K2201/005—Additives being defined by their particle size in general
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- Chemical & Material Sciences (AREA)
- Organic Chemistry (AREA)
- Inorganic Chemistry (AREA)
- Compositions Of Macromolecular Compounds (AREA)
Abstract
The invention relates to the technical field of resin paste, and in particular discloses a high-wear-resistance alpha-Al 2O3 ceramic particle-containing two-component epoxy resin paste, which comprises the following components: the epoxy resin paste consists of A, B two components, wherein the weight ratio of the component A to the component B is 4:1, and the components are as follows: the component A mainly comprises 25.5 to 60 parts of diluent, 15.5 to 40 parts of epoxy resin and 10 to 20 parts of paraffin; the component B mainly comprises the following components: 7.5 to 20 parts of curing agent and 5 to 10 parts of accelerator; 45 parts of alpha-Al 2O3 ceramic particles with different sizes and distributions are added into the A, B component mixture, the high-hardness wear-resistant ceramic particles are compounded with a metal material, the high hardness and high wear resistance of the ceramic particles are combined with the toughness of a metal matrix material, the wear resistance of a wear-resistant part can be improved, the overall toughness of the wear-resistant part can be ensured, and the ceramic particles are adhered to the metal, ceramic and other substrates with high strength to protect, reconstruct and repair the worn parts of equipment.
Description
Technical Field
The invention belongs to the technical field of resin paste, and particularly relates to a double-component epoxy resin paste containing high wear-resistant alpha-Al 2O3 ceramic particles.
Background
Two-component epoxy glues are an important thermosetting resin glue. In particular, the epoxy resin adhesive prepared by the epoxy resin adhesive has the characteristics of excellent physical and mechanical properties, electrical insulation properties, chemical corrosion resistance, heat resistance and adhesion properties, is called as "all-purpose adhesive", and can be widely applied to the industrial fields of chemical industry, light industry, water conservancy, traffic, machinery, electronics, household appliances, automobiles, aerospace, aviation and the like.
The high wear-resistant alpha-Al 2O3 ceramic particle is one kind of alumina ceramic and is one kind of special ceramic with high hardness, high strength, high wear resistance, high chemical resistance and other excellent performance.
However, after the common epoxy resin is cured, the brittleness is high, the impact resistance is poor, the breaking deformation amplitude of the material is small, and the material is easy to crack due to the high crosslinking density; and the epoxy resin is often subjected to interfacial detachment, bulge and the like when the ambient temperature changes due to the difference from the linear expansion coefficient of the encapsulated material after being cured. These factors have limited the use of epoxy potting materials in certain areas to a great extent and further improvements in two-component epoxy resins are needed.
Disclosure of Invention
The invention aims to provide a double-component epoxy resin paste containing high wear-resistant alpha-Al 2O3 ceramic particles so as to solve the problems in the prior art.
In order to achieve the above purpose, the present invention provides the following technical solutions:
a two-component epoxy resin paste containing highly wear-resistant alpha-Al 2O3 ceramic particles, comprising: the epoxy resin paste consists of A, B two components, wherein the weight ratio of the component A to the component B is 4:1, and the components are as follows: the component A mainly comprises 25.5 to 60 parts of diluent, 15.5 to 40 parts of epoxy resin and 10 to 20 parts of paraffin; the component B mainly comprises the following components: 7.5 to 20 parts of curing agent and 5 to 10 parts of accelerator; 45 parts of alpha-Al 2O3 ceramic particles with different sizes and distributions are added into the A, B component mixture.
Preferably, the epoxy resin is at least one selected from the group consisting of phenolic epoxy resin, alicyclic epoxy resin, bisphenol a epoxy resin, bisphenol F epoxy resin, and aliphatic epoxy resin.
Preferably, the epoxy resin is a combination of bisphenol A epoxy resin and bisphenol F epoxy resin, and the mass ratio is 1:0.5.
preferably, the diluent is cyclohexanone.
Preferably, the paraffin is 60# -70# paraffin.
Preferably, the curing agent is at least one selected from polyamide, alicyclic amine, aromatic amine, aliphatic amine and phenolic amine, and the accelerator is at least one selected from triethanolamine, triethylene diamine, stannous chloride and acetylacetone.
Preferably, the alpha-Al 2O3 ceramic particles comprise 30% of coarse particles and 70% of fine particles, wherein the average size of the coarse particles is 62nm, the size distribution is 30-107nm, the average size of the fine particles is 4.5nm, and the size distribution is 2-8nm.
Preferably, the paste preparation and use method comprises the following steps: step one: mixing high-purity alpha-Al 2O3 ceramic particles according to certain particle size distribution and proportion, and then performing ball milling to form uniform ceramic powder;
step two, mixing the component A and the component B according to a certain ratio of 4:1 to form uniform epoxy resin liquid, wherein the epoxy resin liquid is used up within 30 minutes, and the one-time configuration amount is not more than 1.5 kg;
mixing ceramic powder and epoxy resin liquid according to a ratio of 1:2, and then performing vacuum defoaming to form a bubble-free double-component epoxy resin paste;
step four, coarsening the part to be treated, and cleaning the coarsened surface with acetone to ensure that the surface is free of greasy dirt and dust;
step five, coating the paste prepared in the step three layer by layer on the part to be treated, wherein the thickness of the coating is 5mm-10mm, and compacting the first layer;
and step six, curing at 25 ℃ for 24 hours, and heating or prolonging the curing time to promote the curing if the temperature is low.
Compared with the prior art, the invention has the beneficial effects that:
(1) According to the invention, the prepared paste is excellent in wear resistance and corrosion resistance through the alpha-Al 2O3 ceramic particles with different sizes and distribution in a certain proportion, the ceramic particles are excellent in wear resistance, and the service life of equipment is prolonged.
(2) The invention combines the high hardness and high wear resistance of the ceramic particles with the toughness of the metal matrix material, can improve the wear resistance of the wear-resistant part, can ensure the whole toughness of the wear-resistant part, and is used for protecting, reconstructing and repairing the wear part of equipment by attaching the ceramic particles with the metal, ceramic and other substrates with high strength.
Drawings
FIG. 1 is a block diagram of the steps of the present invention;
Detailed Description
The following description of the embodiments of the present invention will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present invention, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
Embodiment one:
referring to FIG. 1, a two-component epoxy resin paste containing highly abrasion resistant alpha-Al 2O3 ceramic particles comprises: the epoxy resin paste consists of A, B two components, wherein the weight ratio of the component A to the component B is 4:1, and the components are as follows: the component A mainly comprises 25.5 to 60 parts of diluent, 15.5 to 40 parts of epoxy resin and 10 to 20 parts of paraffin; the component B mainly comprises the following components: 7.5 to 20 parts of curing agent and 5 to 10 parts of accelerator; 45 parts of alpha-Al 2O3 ceramic particles with different sizes and distributions are added into the A, B component mixture.
Specifically, the epoxy resin is at least one selected from phenolic epoxy resin, alicyclic epoxy resin, bisphenol A epoxy resin, bisphenol F epoxy resin and aliphatic epoxy resin.
Specifically, the epoxy resin is a combination of bisphenol A epoxy resin and bisphenol F epoxy resin, and the mass ratio is 1:0.5.
wherein, the diluent adopts cyclohexanone.
Wherein the paraffin is 60# -70# paraffin.
Wherein the curing agent is at least one selected from polyamide, alicyclic amine, aromatic amine, aliphatic amine and phenolic amine, and the accelerator is at least one selected from triethanolamine, triethylene diamine, stannous chloride and acetylacetone.
Wherein, coarse particles in the alpha-Al 2O3 ceramic particles are 30 percent and fine particles are 70 percent, the average size of the coarse particles is 62nm, the size distribution is 30-107nm, the average size of the fine particles is 4.5nm, and the size distribution is 2-8nm; different particle size classifications have different effects on the properties of the material, e.g., smaller particles can increase the hardness, impact resistance, and wear resistance of the material, but can also increase the sintering difficulty of the material.
The paste preparation and use method comprises the following steps: step one: mixing high-purity alpha-Al 2O3 ceramic particles according to certain particle size distribution and proportion, and then performing ball milling to form uniform ceramic powder;
step two, mixing the component A and the component B according to a certain ratio of 4:1 to form uniform epoxy resin liquid, wherein the epoxy resin liquid is used up within 30 minutes, and the one-time configuration amount is not more than 1.5 kg; too much glue solidifies too quickly and the unused part solidifies and cannot be used;
mixing ceramic powder and epoxy resin liquid according to a ratio of 1:2, and then performing vacuum defoaming to form a bubble-free double-component epoxy resin paste; can be prepared according to the actual temperature, the temperature is lower and can be more properly matched, and the temperature is higher and less properly matched. If the temperature is too low, the component A can be properly heated to reduce the viscosity for configuration;
step four, coarsening the part to be treated, and cleaning the coarsened surface with acetone to ensure that the surface is free of greasy dirt and dust; the post-coating is convenient, so that bubbles and other conditions are avoided when the paste contacts the surface of the substrate;
step five, coating the paste prepared in the step three layer by layer on the part to be treated, wherein the thickness of the coating is 5mm-10mm, and compacting the first layer; fully soaking the surface layer and the base material, and leveling the surface layer after the coating is coated to the size, or coating the surface of the coating with low-viscosity wear-resistant glue;
and step six, curing at 25 ℃ for 24 hours, wherein if the temperature is low, heating or curing time is prolonged to promote curing, and generally, in winter construction, an iodine tungsten lamp can be used for irradiation heating at a distance of 40cm from the coating, so that the iodine tungsten lamp is firmly combined with the substrate, and a wear-resistant layer is formed.
Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made therein without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.
Claims (8)
1. The double-component epoxy resin paste containing the high wear-resistant alpha-Al 2O3 ceramic particles is characterized by comprising A, B double components, wherein the weight ratio of the component A to the component B is 4:1, and the weight ratio of the component A to the component B is as follows: the component A mainly comprises 25.5 to 60 parts of diluent, 15.5 to 40 parts of epoxy resin and 10 to 20 parts of paraffin; the component B mainly comprises the following components: 7.5 to 20 parts of curing agent and 5 to 10 parts of accelerator; 45 parts of alpha-Al 2O3 ceramic particles with different sizes and distributions are added into the A, B component mixture.
2. The high wear resistant alpha-Al 2O3 ceramic particle-containing two-component epoxy resin paste according to claim 1, wherein the two-component epoxy resin paste is characterized in that: the epoxy resin is at least one selected from phenolic epoxy resin, alicyclic epoxy resin, bisphenol A epoxy resin, bisphenol F epoxy resin and aliphatic epoxy resin.
3. The high wear resistant alpha-Al 2O3 ceramic particle-containing two-component epoxy resin paste according to claim 1, wherein the two-component epoxy resin paste is characterized in that: the epoxy resin is a combination of bisphenol A epoxy resin and bisphenol F epoxy resin, and the mass ratio is 1:0.5.
4. the high wear resistant alpha-Al 2O3 ceramic particle-containing two-component epoxy resin paste according to claim 1, wherein the two-component epoxy resin paste is characterized in that: the diluent adopts cyclohexanone.
5. The high wear resistant alpha-Al 2O3 ceramic particle-containing two-component epoxy resin paste according to claim 1, wherein the two-component epoxy resin paste is characterized in that: the paraffin is 60# -70# paraffin.
6. The high wear resistant alpha-Al 2O3 ceramic particle-containing two-component epoxy resin paste according to claim 1, wherein the two-component epoxy resin paste is characterized in that: the curing agent is at least one selected from polyamide, alicyclic amine, aromatic amine, aliphatic amine and phenolic amine, and the accelerator is at least one selected from triethanolamine, triethylene diamine, stannous chloride and acetylacetone.
7. The high wear resistant alpha-Al 2O3 ceramic particle-containing two-component epoxy resin paste according to claim 1, wherein the two-component epoxy resin paste is characterized in that: coarse particles 30% and fine particles 70% in the alpha-Al 2O3 ceramic particles, wherein the average size of the coarse particles is 62nm, the size distribution is 30-107nm, the average size of the fine particles is 4.5nm, and the size distribution is 2-8nm.
8. A two-component epoxy resin paste containing highly abrasion resistant α -ai 2O3 ceramic particles according to any one of claims 1 to 7, characterized in that: the paste preparation and use method comprises the following steps: step one: mixing high-purity alpha-Al 2O3 ceramic particles according to certain particle size distribution and proportion, and then performing ball milling to form uniform ceramic powder;
step two, mixing the component A and the component B according to a certain ratio of 4:1 to form uniform epoxy resin liquid, wherein the epoxy resin liquid is used up within 30 minutes, and the one-time configuration amount is not more than 1.5 kg;
mixing ceramic powder and epoxy resin liquid according to a ratio of 1:2, and then performing vacuum defoaming to form a bubble-free double-component epoxy resin paste;
step four, coarsening the part to be treated, and cleaning the coarsened surface with acetone to ensure that the surface is free of greasy dirt and dust;
step five, coating the paste prepared in the step three layer by layer on the part to be treated, wherein the thickness of the coating is 5mm-10mm, and compacting the first layer;
and step six, curing at 25 ℃ for 24 hours, and heating or prolonging the curing time to promote the curing if the temperature is low.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202310415397.XA CN116285819A (en) | 2023-04-18 | 2023-04-18 | High-wear-resistance alpha-Al 2O3 ceramic particle-containing two-component epoxy resin paste |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202310415397.XA CN116285819A (en) | 2023-04-18 | 2023-04-18 | High-wear-resistance alpha-Al 2O3 ceramic particle-containing two-component epoxy resin paste |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN116285819A true CN116285819A (en) | 2023-06-23 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202310415397.XA Withdrawn CN116285819A (en) | 2023-04-18 | 2023-04-18 | High-wear-resistance alpha-Al 2O3 ceramic particle-containing two-component epoxy resin paste |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN116285819A (en) |
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2023
- 2023-04-18 CN CN202310415397.XA patent/CN116285819A/en not_active Withdrawn
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Application publication date: 20230623 |