CN112940464A - High-performance PBT/PET electromagnetic shielding composite material and preparation method thereof - Google Patents
High-performance PBT/PET electromagnetic shielding composite material and preparation method thereof Download PDFInfo
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- 239000002131 composite material Substances 0.000 title claims abstract description 40
- 238000002360 preparation method Methods 0.000 title claims abstract description 10
- 229920001707 polybutylene terephthalate Polymers 0.000 claims abstract description 45
- 229920000139 polyethylene terephthalate Polymers 0.000 claims abstract description 44
- 239000005020 polyethylene terephthalate Substances 0.000 claims abstract description 44
- 238000002156 mixing Methods 0.000 claims abstract description 30
- -1 polybutylene terephthalate Polymers 0.000 claims abstract description 28
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- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims abstract description 22
- SZVJSHCCFOBDDC-UHFFFAOYSA-N iron(II,III) oxide Inorganic materials O=[Fe]O[Fe]O[Fe]=O SZVJSHCCFOBDDC-UHFFFAOYSA-N 0.000 claims abstract description 22
- 239000002041 carbon nanotube Substances 0.000 claims abstract description 21
- 229910021393 carbon nanotube Inorganic materials 0.000 claims abstract description 21
- 239000000835 fiber Substances 0.000 claims abstract description 20
- 229910001220 stainless steel Inorganic materials 0.000 claims abstract description 16
- 239000010935 stainless steel Substances 0.000 claims abstract description 16
- 239000003795 chemical substances by application Substances 0.000 claims abstract description 15
- 239000003963 antioxidant agent Substances 0.000 claims abstract description 7
- 230000003078 antioxidant effect Effects 0.000 claims abstract description 7
- JKIJEFPNVSHHEI-UHFFFAOYSA-N Phenol, 2,4-bis(1,1-dimethylethyl)-, phosphite (3:1) Chemical compound CC(C)(C)C1=CC(C(C)(C)C)=CC=C1OP(OC=1C(=CC(=CC=1)C(C)(C)C)C(C)(C)C)OC1=CC=C(C(C)(C)C)C=C1C(C)(C)C JKIJEFPNVSHHEI-UHFFFAOYSA-N 0.000 claims description 11
- BGYHLZZASRKEJE-UHFFFAOYSA-N [3-[3-(3,5-ditert-butyl-4-hydroxyphenyl)propanoyloxy]-2,2-bis[3-(3,5-ditert-butyl-4-hydroxyphenyl)propanoyloxymethyl]propyl] 3-(3,5-ditert-butyl-4-hydroxyphenyl)propanoate Chemical compound CC(C)(C)C1=C(O)C(C(C)(C)C)=CC(CCC(=O)OCC(COC(=O)CCC=2C=C(C(O)=C(C=2)C(C)(C)C)C(C)(C)C)(COC(=O)CCC=2C=C(C(O)=C(C=2)C(C)(C)C)C(C)(C)C)COC(=O)CCC=2C=C(C(O)=C(C=2)C(C)(C)C)C(C)(C)C)=C1 BGYHLZZASRKEJE-UHFFFAOYSA-N 0.000 claims description 11
- 239000000463 material Substances 0.000 claims description 10
- PFNROQCAJVOSIR-UHFFFAOYSA-N oxiran-2-ylmethyl 2-methylprop-2-enoate;5-phenylpenta-2,4-dienenitrile Chemical compound CC(=C)C(=O)OCC1CO1.N#CC=CC=CC1=CC=CC=C1 PFNROQCAJVOSIR-UHFFFAOYSA-N 0.000 claims description 10
- HEMHJVSKTPXQMS-UHFFFAOYSA-M Sodium hydroxide Chemical compound [OH-].[Na+] HEMHJVSKTPXQMS-UHFFFAOYSA-M 0.000 claims description 6
- 238000006243 chemical reaction Methods 0.000 claims description 6
- FPYJFEHAWHCUMM-UHFFFAOYSA-N maleic anhydride Chemical compound O=C1OC(=O)C=C1 FPYJFEHAWHCUMM-UHFFFAOYSA-N 0.000 claims description 4
- 238000000034 method Methods 0.000 claims description 4
- 239000000203 mixture Substances 0.000 claims description 4
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 4
- 239000011790 ferrous sulphate Substances 0.000 claims description 3
- 235000003891 ferrous sulphate Nutrition 0.000 claims description 3
- BAUYGSIQEAFULO-UHFFFAOYSA-L iron(2+) sulfate (anhydrous) Chemical compound [Fe+2].[O-]S([O-])(=O)=O BAUYGSIQEAFULO-UHFFFAOYSA-L 0.000 claims description 3
- 229910000359 iron(II) sulfate Inorganic materials 0.000 claims description 3
- AKHNMLFCWUSKQB-UHFFFAOYSA-L sodium thiosulfate Chemical compound [Na+].[Na+].[O-]S([O-])(=O)=S AKHNMLFCWUSKQB-UHFFFAOYSA-L 0.000 claims description 3
- 235000019345 sodium thiosulphate Nutrition 0.000 claims description 3
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- 238000001291 vacuum drying Methods 0.000 claims description 2
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- 239000004698 Polyethylene Substances 0.000 claims 1
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- 238000005303 weighing Methods 0.000 claims 1
- 239000000945 filler Substances 0.000 abstract description 8
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- 230000002195 synergetic effect Effects 0.000 abstract description 2
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- 239000003973 paint Substances 0.000 abstract 1
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- 238000004729 solvothermal method Methods 0.000 abstract 1
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- 230000000052 comparative effect Effects 0.000 description 7
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- 229910000859 α-Fe Inorganic materials 0.000 description 1
Classifications
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L67/00—Compositions of polyesters obtained by reactions forming a carboxylic ester link in the main chain; Compositions of derivatives of such polymers
- C08L67/02—Polyesters derived from dicarboxylic acids and dihydroxy compounds
-
- 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
- C08K2201/011—Nanostructured additives
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L2205/00—Polymer mixtures characterised by other features
- C08L2205/02—Polymer mixtures characterised by other features containing two or more polymers of the same C08L -group
- C08L2205/025—Polymer mixtures characterised by other features containing two or more polymers of the same C08L -group containing two or more polymers of the same hierarchy C08L, and differing only in parameters such as density, comonomer content, molecular weight, structure
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L2205/00—Polymer mixtures characterised by other features
- C08L2205/03—Polymer mixtures characterised by other features containing three or more polymers in a blend
Abstract
The invention discloses a high-performance PBT/PET electromagnetic shielding composite material and a preparation method thereof. The paint comprises the following components in percentage by weight: 60-80 parts of polybutylene terephthalate, 20-40 parts of polyethylene terephthalate, 5-10 parts of compatilizer, 5-8 parts of carbon nano tube and Fe3O45-10 parts of nano wires, 5-10 parts of stainless steel fibers, 0.6-1 part of surface treating agent and 0.5-1.0 part of antioxidant. One-dimensional Fe3O4Nanowire and method of manufacturing the sameThe result was prepared by solvothermal method using PEG as template. The invention also provides a preparation method of the PBT/PET electromagnetic shielding composite material, which comprises the following steps: uniformly blending the raw materials, the compatilizer, the filler and the like according to the formula ratio, and extruding by using a double screw to obtain the PBT/PET electromagnetic shielding composite material. The PBT/PET composite material prepared by the invention has a multi-network structure constructed by the one-dimensional carbon material, the one-dimensional magnetic nano material and the conductive fiber, so that the PBT/PET composite material has synergistic effects of dielectric loss, magnetic loss, metal shielding and the like, and the composite material with excellent electromagnetic shielding effect is developed.
Description
Technical Field
The invention belongs to the technical field of preparation of electromagnetic shielding composite materials, and relates to a PBT/PET electromagnetic shielding composite material and a preparation method thereof.
Background
With the rapid development of electronic information technology and electronic equipment, electromagnetic waves are widely used as information transmission carriers in people's social life. However, the electromagnetic pollution, electromagnetic interference, information leakage, etc. become more serious, and how to provide a safe and reliable electromagnetic shield has become an important research subject. At present, the main method for solving the problem of electromagnetic pollution is to shield and absorb electromagnetic waves by adopting an electromagnetic shielding material. The metal electromagnetic shielding material is most widely used, but has the defects of high density, complex processing, easy corrosion and the like. The polymer electromagnetic shielding composite material gradually becomes an important research direction in the field of novel electromagnetic shielding due to the characteristics of small mass, easy processing, adjustable electromagnetic shielding and the like.
The traditional polymer magnetic shielding composite material mainly adopts metal, carbon black, graphite and the like as conductive fillers. Carbon nanotubes are an important class of carbon materials, and mainly implement shielding of electromagnetic waves through dielectric loss, and the shielding effectiveness is not good. Ferrite has higher magnetic conductivity and lower electric conductivity, and is generally compounded with dielectric loss type materials to realize defect complementation. One-dimensional magnetic Fe3O4The nanowire has unique anisotropy, so it has many excellent properties such as large specific surface area, spatial confinement, and assemblability, which makes it a hot spot in the fields of optics, magnetics, and microwave absorption. Conductive fibers generally refer to fibers having a specific resistance of less than 10 under atmospheric conditions7Omega cm fiber, has good conductivity and durability. In generalAs a single added filler, the electromagnetic shielding function is single, and the absorption frequency band is narrow; the problems of over-high addition of the filler, reduction of the mechanical property of the material and the like are solved, so that the effective electromagnetic shielding effect cannot be achieved.
With the diversity of functional requirements, the current electromagnetic shielding material cannot meet the application requirements. How to increase the absorption frequency band through filler composition, material structure design and the like, and realize the multifunction and controllability of the macroscopic electromagnetic shielding material is a key problem still to be solved.
Disclosure of Invention
The invention provides a method for preparing a composite material by using carbon nano tube and Fe to overcome the defects of the existing single-performance electromagnetic shielding material technology3O4The high-dimensional composite filler such as the nano wires and the stainless steel fibers realizes the effective construction of a low-contact resistance and high-conductivity network of the conductive filler in the polymer aggregate, thereby preparing the high-performance PBT/PET electromagnetic shielding composite material.
The invention is realized by the following technical scheme: 60-80 parts of polybutylene terephthalate, 20-40 parts of polyethylene terephthalate, 5-10 parts of compatilizer, 5-8 parts of carbon nano tube and Fe3O45-10 parts of nanowires, 5-10 parts of stainless steel fibers, 0.6-1 part of surface treating agent and 0.5-1.0 part of antioxidant;
the one-dimensional ferroferric oxide nanowire is induced by a template agent so as to control the anisotropic growth to finally form a linear structure. Said Fe3O4The nanowire is obtained by the following preparation method:
(1) sodium thiosulfate and ferrous sulfate are weighed and added into a mixed solution of PEG and water, the pH value is adjusted to 1l by NaOH, and then the mixture is poured into the inner liner of a reaction kettle.
(2) Sealing the reaction kettle, preserving the heat for 8 hours at 180 ℃, and cooling to room temperature after the reaction is finished. Washing the black precipitate with deionized water, removing excessive ionic impurities, settling with magnet, collecting, and vacuum drying at 60 deg.C to obtain Fe3O4A nanowire.
Further, the compatilizer is formed by mixing one or more of maleic anhydride grafted acrylonitrile-butadiene-styrene terpolymer, maleic anhydride grafted ethylene-octene copolymer and styrene-acrylonitrile-glycidyl methacrylate terpolymer according to any proportion.
Further, the diameter of the carbon nano tube is 10-15nm, and the length of the carbon nano tube is 1-10 μm; fe3O4The diameter of the nanowire is 20-50nm, and the length of the nanowire is 10-50 mu m; the diameter of the stainless steel fiber is 6-11 μm, and the length is 6 mm.
Further, the surface treatment agent is formed by mixing one or more of silane coupling agent, methyl silicone oil and silicone powder according to any proportion.
Furthermore, the antioxidant is formed by mixing one or two of antioxidant 1010 and antioxidant 168 according to any proportion.
The invention also discloses a preparation method of the PBT/PET electromagnetic shielding composite material, which comprises the following steps:
(1) polybutylene terephthalate, polyethylene terephthalate, compatilizer, carbon nano tube and Fe3O4Uniformly mixing the nanowires, the stainless steel fibers and the antioxidant;
(2) and melting, blending and extruding the mixture in a double-screw extruder for granulation to obtain the electromagnetic shielding PBT/PET composite material.
Further, in the step (2), the temperature of the twin-screw extruder is 210-.
The invention has the beneficial effects that:
(1) by carbon nanotube, Fe3O4The nano wire and the stainless steel fiber are constructed to form the composite electromagnetic shielding material. The three one-dimensional fillers realize the effective construction of a low contact resistance and high conductive network of the fillers in the polymer matrix.
(2) The PBT/PET composite material obtained by the invention has excellent comprehensive performance, and realizes high electromagnetic shielding performance on the basis of meeting the mechanical property. Experimental results show that the PBT/PET composite material provided by the invention has shielding effectiveness of more than 50dB and thermal conductivity of more than or equal to 2 W.m-1·K-1。
Detailed Description
The invention is further explained below with reference to specific examples, but the scope of protection described herein is not limited to the examples.
Example 1
60 parts of polybutylene terephthalate, 40 parts of polyethylene terephthalate, 5 parts of styrene-acrylonitrile-glycidyl methacrylate ternary random copolymer, 5 parts of carbon nano tube and 5 parts of Fe3O4Uniformly mixing the nanowire, 5 parts of stainless steel fiber, 0.8 part of surface treating agent, 0.5 part of antioxidant 1010 and 0.5 part of antioxidant 168, performing melt blending by using a double-screw extruder at the cylinder temperature of 210 plus 235 ℃ and the screw rotation speed of 300rpm, and performing extrusion granulation to obtain the PBT/PET electromagnetic shielding composite material.
Example 2
70 parts of polybutylene terephthalate, 30 parts of polyethylene terephthalate, 5 parts of styrene-acrylonitrile-glycidyl methacrylate ternary random copolymer, 5 parts of carbon nano tube and 5 parts of Fe3O4Uniformly mixing the nanowire, 5 parts of stainless steel fiber, 0.8 part of surface treating agent, 0.5 part of antioxidant 1010 and 0.5 part of antioxidant 168, performing melt blending by using a double-screw extruder at the cylinder temperature of 210 plus 235 ℃ and the screw rotation speed of 300rpm, and performing extrusion granulation to obtain the PBT/PET electromagnetic shielding composite material.
Example 3
80 parts of polybutylene terephthalate, 20 parts of polyethylene terephthalate, 5 parts of styrene-acrylonitrile-glycidyl methacrylate ternary random copolymer, 5 parts of carbon nano tube and 5 parts of Fe3O4Uniformly mixing the nanowire, 5 parts of stainless steel fiber, 0.8 part of surface treating agent, 0.5 part of antioxidant 1010 and 0.5 part of antioxidant 168, performing melt blending by using a double-screw extruder at the cylinder temperature of 210 plus 235 ℃ and the screw rotation speed of 300rpm, and performing extrusion granulation to obtain the PBT/PET electromagnetic shielding composite material.
Example 4
70 parts of polybutylene terephthalate, 30 parts of polyethylene terephthalate, 5 parts of styrene-acrylonitrile-glycidyl methacrylate ternary random copolymer, 5 parts of carbon nano tube and 5 parts of Fe3O4Uniformly mixing the nanowire, 10 parts of stainless steel fiber, 0.8 part of surface treating agent, 0.5 part of antioxidant 1010 and 0.5 part of antioxidant 168, performing melt blending by using a double-screw extruder at the cylinder temperature of 210 plus 235 ℃ and the screw rotation speed of 300rpm, and performing extrusion granulation to obtain the PBT/PET electromagnetic shielding composite material.
Example 5
70 parts of polybutylene terephthalate, 30 parts of polyethylene terephthalate, 5 parts of styrene-acrylonitrile-glycidyl methacrylate ternary random copolymer, 8 parts of carbon nano tube and 5 parts of Fe3O4Uniformly mixing the nanowire, 10 parts of stainless steel fiber, 0.8 part of surface treating agent, 0.5 part of antioxidant 1010 and 0.5 part of antioxidant 168, performing melt blending by using a double-screw extruder at the cylinder temperature of 210 plus 235 ℃ and the screw rotation speed of 300rpm, and performing extrusion granulation to obtain the PBT/PET electromagnetic shielding composite material.
Comparative example 1
70 parts of polybutylene terephthalate, 30 parts of polyethylene terephthalate, 5 parts of styrene-acrylonitrile-glycidyl methacrylate ternary random copolymer, 5 parts of carbon nano tube, 0.8 part of surface treating agent, 0.5 part of antioxidant 1010 and 0.5 part of antioxidant 168, uniformly mixing, performing melt blending by using a double-screw extruder, wherein the temperature of a charging barrel is 210-235 ℃, the rotating speed of a screw is 300rpm, and performing extrusion granulation to obtain the PBT/PET electromagnetic shielding composite material.
Comparative example 2
70 parts of polybutylene terephthalate, 30 parts of polyethylene terephthalate, 5 parts of styrene-acrylonitrile-glycidyl methacrylate ternary random copolymer and 5 parts of Fe3O4Uniformly mixing the nanowire, 0.8 part of surface treating agent, 0.5 part of antioxidant 1010 and 0.5 part of antioxidant 168, carrying out melt blending by using a double-screw extruder at the charging barrel temperature of 210-235 ℃ and the screw rotating speed of 300rpm, and carrying out extrusion granulation to obtain the PBT/PET electromagnetic shielding composite material.
Comparative example 3
70 parts of polybutylene terephthalate, 30 parts of polyethylene terephthalate and 5 parts of styrene-acrylonitrile-methacrylic acidGlycidyl ester ternary random copolymer, 5 parts of carbon nano tube and 5 parts of Fe3O4Uniformly mixing the nanowire, 0.8 part of surface treating agent, 0.5 part of antioxidant 1010 and 0.5 part of antioxidant 168, carrying out melt blending by using a double-screw extruder at the charging barrel temperature of 210-235 ℃ and the screw rotating speed of 300rpm, and carrying out extrusion granulation to obtain the PBT/PET electromagnetic shielding composite material.
Comparative example 4
70 parts of polybutylene terephthalate, 30 parts of polyethylene terephthalate, 5 parts of styrene-acrylonitrile-glycidyl methacrylate ternary random copolymer and 5 parts of Fe3O4Uniformly mixing the nanowire, 5 parts of stainless steel fiber, 0.8 part of surface treating agent, 0.5 part of antioxidant 1010 and 0.5 part of antioxidant 168, performing melt blending by using a double-screw extruder at the cylinder temperature of 210 plus 235 ℃ and the screw rotation speed of 300rpm, and performing extrusion granulation to obtain the PBT/PET electromagnetic shielding composite material.
And (3) performance testing: the PBT/PET composites prepared in the above examples and comparative examples were molded into bars using an injection molding machine. The bending property is carried out at room temperature according to the GB/T9341-2008 standard, and 3 splines in each group are averaged. The heat distortion temperature was measured according to GB/T1634.1-2004, and 3 bars were averaged for each set of tests. The cantilever beam impact strength is carried out according to GB/T1843-2008, and 5 splines are tested in each group and averaged. The thermal conductivity is carried out according to GB/T10297-. The electromagnetic shielding uses a vector network analyzer, and the measurement is carried out between 8.2 GHz and 12.4GHz in an X-wave frequency band by adopting a waveguide method.
The test data are as follows:
as can be seen from the table, in the case of using a single or two fillers in the formulated systems of comparative examples 1 to 4, the PBT/PET composite material prepared had a lower strength,Thermal conductivity and electromagnetic shielding performance. In contrast, the mechanical properties, thermal conductivity, and electromagnetic shielding properties of examples 1-5 were all superior to those of comparative examples 1-4. Example by one-dimensional carbon nanotubes, one-dimensional Fe3O4The nano wires and the stainless steel fibers are compounded in a specific proportion range to form a multi-network structure, so that the multi-network structure has the synergistic effects of dielectric loss, magnetic loss, metal shielding and the like, and a composite material with excellent mechanical property, thermal conductivity and electromagnetic shielding effect is developed.
The above embodiments are merely illustrative of the technical solutions of the present invention and not restrictive, and it should be understood that various changes, modifications, substitutions and alterations can be made herein without departing from the principle and spirit of the invention as defined by the appended claims and their equivalents.
Claims (7)
1. The high-performance PBT/PET electromagnetic shielding composite material is characterized by comprising the following components in parts by weight: 60-80 parts of polybutylene terephthalate, 20-40 parts of polyethylene terephthalate, 5-10 parts of compatilizer, 5-8 parts of carbon nano tube and Fe3O45-10 parts of nanowires, 5-10 parts of stainless steel fibers, 0.6-1 part of surface treating agent and 0.5-1.0 part of antioxidant; said Fe3O4The nanowire is obtained by the following preparation method:
a. weighing sodium thiosulfate and ferrous sulfate, adding the sodium thiosulfate and the ferrous sulfate into a mixed solution of PEG and water, adjusting the pH value to 1l by using NaOH, and then pouring the solution into the inner liner of a reaction kettle;
b. sealing the reaction kettle, preserving the heat for 8 hours at 180 ℃, and cooling to room temperature after the reaction is finished. Washing the black precipitate with deionized water, removing excessive ionic impurities, settling and collecting with magnet, and vacuum drying at 60 deg.C to obtain Fe3O4A nanowire.
2. The high-performance PBT/PET electromagnetic shielding composite material of claim 1, wherein the method comprises the following steps:
a. mixing polybutylene terephthalate and polyethylene terephthalateEster, compatibilizer, carbon nanotube, Fe3O4Uniformly mixing the nanowires, the stainless steel fibers, the antioxidant and the surface treating agent;
b. and melting, blending, extruding and granulating the mixture in a double-screw extruder to obtain the electromagnetic shielding PBT/PET composite material.
3. The high-performance PBT/PET electromagnetic shielding composite material of claim 1, wherein: the compatilizer is formed by mixing one or more of maleic anhydride grafted acrylonitrile-butadiene-styrene terpolymer, maleic anhydride grafted ethylene-octene copolymer and styrene-acrylonitrile-glycidyl methacrylate terpolymer according to any proportion.
4. The high-performance PBT/PET electromagnetic shielding composite material of claim 1, wherein: the diameter of the carbon nano tube is 10-15nm, and the length of the carbon nano tube is 1-10 mu m; fe3O4The diameter of the nanowire is 20-50nm, and the length of the nanowire is 10-50 mu m; the diameter of the stainless steel fiber is 6-11 μm, and the length is 6 mm.
5. The high-performance PBT/PET electromagnetic shielding composite material of claim 1, wherein: the surface treating agent is formed by mixing one or more of silane coupling agent, methyl silicone oil and silicone powder according to any proportion.
6. The carbon nanotube-based PBT/PET electromagnetic shielding composite material of claim 1, wherein: the antioxidant is formed by mixing one or two of an antioxidant 1010 and an antioxidant 168 according to any proportion.
7. The preparation method of the high-performance PBT/PET electromagnetic shielding composite material according to claim 2, characterized by comprising the following steps: in the step b, the temperature of the material cylinder of the double-screw extruder is 210-235 ℃, and the rotating speed of the screw is 300-350 rpm.
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113621222A (en) * | 2021-08-13 | 2021-11-09 | 江阴市龙山合成材料有限公司 | Low-melting-point PBT electromagnetic shielding composite material and preparation method thereof |
| CN115181304A (en) * | 2022-08-10 | 2022-10-14 | 深圳市西陆光电技术有限公司 | Preparation method of anti-electromagnetic wave interference polyester film |
| CN115260556A (en) * | 2022-09-05 | 2022-11-01 | 深圳市西陆光电技术有限公司 | Preparation method of nano silver wire antistatic polyester film |
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| Publication number | Priority date | Publication date | Assignee | Title |
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