CN110628192A - Electromagnetic shielding material based on 3D printing and preparation method thereof - Google Patents
Electromagnetic shielding material based on 3D printing and preparation method thereof Download PDFInfo
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- CN110628192A CN110628192A CN201910937586.7A CN201910937586A CN110628192A CN 110628192 A CN110628192 A CN 110628192A CN 201910937586 A CN201910937586 A CN 201910937586A CN 110628192 A CN110628192 A CN 110628192A
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- electromagnetic shielding
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B33—ADDITIVE MANUFACTURING TECHNOLOGY
- B33Y—ADDITIVE MANUFACTURING, i.e. MANUFACTURING OF THREE-DIMENSIONAL [3-D] OBJECTS BY ADDITIVE DEPOSITION, ADDITIVE AGGLOMERATION OR ADDITIVE LAYERING, e.g. BY 3-D PRINTING, STEREOLITHOGRAPHY OR SELECTIVE LASER SINTERING
- B33Y70/00—Materials specially adapted for additive manufacturing
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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
- 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
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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
- C08K9/00—Use of pretreated ingredients
- C08K9/04—Ingredients treated with organic substances
- C08K9/06—Ingredients treated with organic substances with silicon-containing compounds
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- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05K—PRINTED CIRCUITS; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS
- H05K9/00—Screening of apparatus or components against electric or magnetic fields
- H05K9/0073—Shielding materials
- H05K9/0081—Electromagnetic shielding materials, e.g. EMI, RFI shielding
-
- 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
- C08K2003/2262—Oxides; Hydroxides of metals of manganese
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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
- 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
- C08K2003/2265—Oxides; Hydroxides of metals of iron
- C08K2003/2272—Ferric oxide (Fe2O3)
-
- 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
- C08K2003/2293—Oxides; Hydroxides of metals of nickel
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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
- 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
- C08K2003/2296—Oxides; Hydroxides of metals of zinc
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- Chemical Kinetics & Catalysis (AREA)
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- Polymers & Plastics (AREA)
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- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Electromagnetism (AREA)
- Microelectronics & Electronic Packaging (AREA)
- Manufacturing & Machinery (AREA)
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Abstract
The invention discloses an electromagnetic shielding material based on 3D printing and a manufacturing method thereof, wherein the electromagnetic shielding material based on 3D printing is composed of the following raw materials in parts by weight: 27-50 parts of polylactic acid; 48.5-70 parts of ferrite; 1-2 parts of a dispersant; 0.5-1 part of coupling agent. The invention has the advantages that: compared with the traditional processing mode of adhering and attaching the electromagnetic shielding material to an object, the invention realizes the application of 3D printing by formula selection, simultaneously improves the electromagnetic shielding effect, is easier to manufacture a complex structural member, is convenient to use in different places, can realize the application of 3D printing, and can better disperse ferrite powder in polylactic acid by blending and extruding a mixture through a single screw rod and adding a dispersing agent, so that the compatibility of the ferrite powder and the polylactic acid is improved by adding a coupling agent, thereby improving the mechanical property of the electromagnetic shielding composite material wire.
Description
Technical Field
The invention relates to an electromagnetic shielding material based on 3D printing and a preparation method thereof.
Background
With the social progress and the development of science and technology, people's lives are full of various electromagnetic radiations, the actual electromagnetic pollution is serious, and the living environment and the body health of people are seriously harmed, so that the electromagnetic hazard is valued by various countries. High-performance electromagnetic shielding materials have become a key technology for solving electromagnetic pollution. With the advent of the high-frequency and high-speed 5G era and the development of wearable equipment, higher requirements are put on electromagnetic shielding materials. Although the metal material has good electromagnetic shielding performance, the further use of the metal material is limited by the defects of high density, easy corrosion and the like. Therefore, the development of efficient, lightweight, flexible, corrosion-resistant metal-based electromagnetic shielding materials is a significant challenge.
How to improve the electromagnetic shielding efficiency and the preparation process are difficult problems to develop later. The current 3D printing technology develops rapidly, and the electromagnetic shielding product printed by directly applying the 3D printing technology becomes an objective requirement. Compared with the traditional forming method, the 3D printing technology is more flexible, and a proper model can be designed according to different product shapes by means of a computer software system, so that the cost is reduced, and the shielding efficiency is improved. For polymers, a Fused Deposition Modeling (FDM) process is most widely applied and the technology is the most mature, required composite material wires can be printed and coated on a workbench through a heating printing head, the fused wires are stacked layer by layer to form a three-dimensional solid product, and shielding materials are printed through the Fused Deposition Modeling (FDM) technology, so that shielding omission caused by joints can be avoided, and the overall shielding effect of the product is greatly improved.
Disclosure of Invention
The invention aims to provide an electromagnetic shielding material based on 3D printing and a preparation method thereof, so as to solve the problems in the background technology.
In order to solve the technical problems, the technical scheme provided by the invention is as follows:
the electromagnetic shielding material based on 3D printing is composed of the following raw materials in parts by weight: 27-50 parts of polylactic acid; 48.5-70 parts of ferrite; 1-2 parts of a dispersant; 0.5-1 part of coupling agent.
Preferably, the molecular weight of the polylactic acid is 15 to 18 ten thousand.
Preferably, the ferrite is prepared by sintering ferric oxide, nickel oxide, zinc oxide and manganese oxide.
Preferably, the dispersant is one or more of triethylhexyl phosphoric acid, sodium dodecyl sulfate and fatty acid polyglycol ester.
Preferably, the coupling agent is one or more of silane coupling agents KH550, KH560 and KH 570.
The invention also provides a method for preparing the electromagnetic shielding material based on 3D printing, which is prepared according to the following steps:
1) dissolving a dispersing agent and a coupling agent in absolute ethyl alcohol to prepare an absolute ethyl alcohol solution;
2) adding ferrite into the solution prepared in the step 1), stirring for 30 minutes, filtering to obtain powder, and placing the powder in an oven for drying to obtain dried powder;
3) uniformly stirring and mixing the powder prepared in the step 2) and polylactic acid according to a certain proportion, placing the mixture in an oven, preheating and drying the polylactic acid, and then extruding the dried mixture by a single screw to obtain the polylactic acid ferrite composite wire.
Preferably, the absolute ethyl alcohol in the step 1) is analytically pure, the concentration of the dispersing agent is 10g/L-20g/L, and the concentration of the coupling agent is 5g/L-10 g/L.
Preferably, the oven temperature in the step 2) is 60 ℃, and the drying time is 5 hours.
Preferably, the oven temperature in the step 3) is 80 ℃, and the drying time is 5 hours.
Preferably, the screw rotating speed of the single-screw extruder is 50r/min-70r/min, and the extrusion temperature is set to be 190-210 ℃.
The diameter of the resulting wire is preferably 1.6 to 2.5mm, more preferably 1.75 mm.
The wire rod has the hardness of 95-120MPa, the tensile strength of 60-75MPa and the magnetic conductivity of 100-180@3MHz, can be applied to FDM type 3D printing, particularly to printing an electromagnetic shielding structural member, can be customized and printed according to the complexity of the structural member, and realizes the electromagnetic shielding effect.
Compared with the prior art, the invention has the following advantages and beneficial effects:
1) the wire based on the 3D printed electromagnetic shielding material has the hardness of 95-120D and the tensile strength of 60-75MPa, is suitable for FDM process, can be used for printing electromagnetic shielding structural members, and compared with the traditional processing mode of adhering the electromagnetic shielding material to an object, the invention realizes the application of 3D printing by formula selection, improves the electromagnetic shielding effect, is easier to manufacture complex structural members and is convenient to use in different places;
2) according to the invention, the ferrite and the polylactic acid are adopted to prepare the composite material, the application of 3D printing can be realized, the mixture is subjected to single-screw blending extrusion, the dispersing agent is added, the ferrite powder can be well dispersed in the polylactic acid, and the compatibility of the ferrite powder and the polylactic acid is improved by adding the coupling agent, so that the mechanical property of the electromagnetic shielding composite material wire is improved.
Detailed Description
The invention is illustrated below by means of specific examples, without being restricted thereto.
Example one
1) Taking 50 parts of polylactic acid, 48.5 parts of ferrite, 1 part of dispersant sodium dodecyl sulfate and 0.5 part of silane coupling agent KH 550; sodium dodecyl sulfate and silane coupling agent KH550 solvent absolute ethyl alcohol are added to prepare a solution with the concentration of the dispersing agent of 10g/L and the concentration of the coupling agent of 5 g/L;
2) adding ferrite into the solution prepared in the step 1), stirring for 30 minutes, filtering to obtain powder, and drying in an oven at 60 ℃ to obtain dried powder;
3) uniformly stirring and mixing the powder prepared in the step 2) and polylactic acid according to a certain proportion, placing the mixture in an oven at 80 ℃, preheating and drying the polylactic acid, and then extruding the dried mixture through a single screw to obtain a polylactic acid/ferrite composite material wire, wherein the screw rotating speed of a single screw extruder is 60r/min, the temperatures of four extrusion areas are 190 ℃, 200 ℃, 210 ℃ and 200 ℃, the aperture of the wire extrusion is controlled, and finally the 3D printing shielding material 1 with the diameter of 1.75mm is obtained, and the hardness of the material 1 is 95D, the tensile strength is 75MPa, and the magnetic conductivity is 100@3 MHz.
Example two
1) Taking 27 parts of polylactic acid, 70 parts of ferrite, 2 parts of dispersant sodium dodecyl sulfate and 1 part of silane coupling agent KH 550; sodium dodecyl sulfate and silane coupling agent KH550 solvent absolute ethyl alcohol are added to prepare a solution with 20g/L of dispersant and 10g/L of coupling agent;
2) adding ferrite into the solution prepared in the step 1), stirring for 30 minutes, filtering to obtain powder, and drying in an oven at 60 ℃ to obtain dried powder;
3) uniformly stirring and mixing the powder prepared in the step 2) and polylactic acid according to a certain proportion, placing the mixture in an oven at 80 ℃, preheating and drying the polylactic acid, and then extruding the dried mixture through a single screw to obtain a polylactic acid/ferrite composite material wire, wherein the screw rotating speed of a single screw extruder is 60r/min, the temperatures of four extrusion areas are 190 ℃, 200 ℃, 210 ℃ and 200 ℃, the aperture of the wire extrusion is controlled, and finally the 3D printing shielding material 2 with the diameter of 1.75mm is obtained, and the hardness of the material 1 is 120D, the tensile strength is 60MPa, and the magnetic conductivity is 180@3 MHz.
Wherein, when the content of the ferrite in the composite material is higher, the hardness and the electromagnetic shielding effect of the electromagnetic shielding material are higher than those of the composite material with less ferrite. Compared with the prior art, the invention can print low magnetic conductivity and high magnetic conductivity electromagnetic shielding materials through a 3D printing mode, can manufacture wires with different electromagnetic shielding effects according to different electromagnetic shielding requirements, and prints out required electromagnetic shielding structural parts.
The above examples are preferred embodiments of the present invention, but the embodiments of the present invention are not limited by the above examples, and therefore, the scope of the present invention is not limited by the above examples, and any substitution modes such as simplification and modification are within the scope of the present invention.
Claims (10)
1. The electromagnetic shielding material based on 3D printing is characterized by comprising the following raw materials in parts by weight: 27-50 parts of polylactic acid; 48.5-70 parts of ferrite; 1-2 parts of a dispersant; 0.5-1 part of coupling agent.
2. The electromagnetic shielding material based on 3D printing according to claim 1, wherein: the molecular weight of the polylactic acid is 15-18 ten thousand.
3. The electromagnetic shielding material based on 3D printing according to claim 1, wherein: the ferrite is prepared by sintering ferric oxide, nickel oxide, zinc oxide and manganese oxide.
4. The electromagnetic shielding material based on 3D printing according to claim 1, wherein: the dispersing agent is one or more of triethyl hexyl phosphoric acid, sodium dodecyl sulfate and fatty acid polyglycol ester.
5. The electromagnetic shielding material based on 3D printing according to claim 1, wherein: the coupling agent is one or more of silane coupling agents KH550, KH560 and KH 570.
6. The preparation method of the electromagnetic shielding material based on 3D printing according to any one of claims 1 to 5, wherein the electromagnetic shielding material is prepared according to the following steps:
1) dissolving a dispersing agent and a coupling agent in absolute ethyl alcohol to prepare an absolute ethyl alcohol solution;
2) adding ferrite into the solution prepared in the step 1), stirring for 30 minutes, filtering to obtain powder, and placing the powder in an oven for drying to obtain dried powder;
3) uniformly stirring and mixing the powder prepared in the step 2) and polylactic acid according to a certain proportion, placing the mixture in an oven, preheating and drying the polylactic acid, and then extruding the dried mixture by a single screw to obtain the polylactic acid ferrite composite wire.
7. The electromagnetic shielding material based on 3D printing according to claim 6, wherein: in the step 1), the absolute ethyl alcohol is analytically pure, the concentration of the dispersing agent is 10g/L-20g/L, and the concentration of the coupling agent is 5g/L-10 g/L.
8. The electromagnetic shielding material based on 3D printing according to claim 6, wherein: the temperature of the oven in the step 2) is 60 ℃, and the drying time is 5 hours.
9. The electromagnetic shielding material based on 3D printing according to claim 6, wherein: the temperature of the oven in the step 3) is 80 ℃, and the drying time is 5 hours.
10. The electromagnetic shielding material based on 3D printing according to claim 6, wherein: the screw rotating speed of the single screw extruder is 50r/min-70r/min, and the extrusion temperature is set to be 190-210 ℃.
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113897042A (en) * | 2021-11-17 | 2022-01-07 | 江南大学 | 3D printing wavy structure shape memory composite material and preparation method thereof |
| CN115558267A (en) * | 2022-11-04 | 2023-01-03 | 伊诺维(无锡)新材料科技有限公司 | 3D printing wave structure shape memory composite material with controllable low-frequency electromagnetic shielding performance and preparation method thereof |
| US11634599B2 (en) | 2014-11-24 | 2023-04-25 | Ppg Industries Ohio, Inc. | Coreactive materials and methods for three-dimensional printing |
| US12138850B2 (en) | 2020-11-10 | 2024-11-12 | Ppg Industries Ohio, Inc. | Additive manufacturing using polyurea materials |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US11634599B2 (en) | 2014-11-24 | 2023-04-25 | Ppg Industries Ohio, Inc. | Coreactive materials and methods for three-dimensional printing |
| US11920046B2 (en) | 2014-11-24 | 2024-03-05 | Ppg Industries Ohio, Inc. | Coreactive materials and methods for three-dimensional printing |
| US12138850B2 (en) | 2020-11-10 | 2024-11-12 | Ppg Industries Ohio, Inc. | Additive manufacturing using polyurea materials |
| CN113897042A (en) * | 2021-11-17 | 2022-01-07 | 江南大学 | 3D printing wavy structure shape memory composite material and preparation method thereof |
| CN113897042B (en) * | 2021-11-17 | 2022-06-07 | 江南大学 | 3D printing wavy structure shape memory composite material and preparation method thereof |
| CN115558267A (en) * | 2022-11-04 | 2023-01-03 | 伊诺维(无锡)新材料科技有限公司 | 3D printing wave structure shape memory composite material with controllable low-frequency electromagnetic shielding performance and preparation method thereof |
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