CN111787685A - Reflection-type electromagnetic shielding film for FPC and preparation method thereof - Google Patents
Reflection-type electromagnetic shielding film for FPC and preparation method thereof Download PDFInfo
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- CN111787685A CN111787685A CN202010753503.1A CN202010753503A CN111787685A CN 111787685 A CN111787685 A CN 111787685A CN 202010753503 A CN202010753503 A CN 202010753503A CN 111787685 A CN111787685 A CN 111787685A
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- 238000000576 coating method Methods 0.000 claims abstract description 105
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- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 claims abstract description 36
- 239000000843 powder Substances 0.000 claims abstract description 35
- 239000000741 silica gel Substances 0.000 claims abstract description 30
- 229910002027 silica gel Inorganic materials 0.000 claims abstract description 30
- BDOQCAOAGXTEBZ-UHFFFAOYSA-N OC([Fe])=O Chemical compound OC([Fe])=O BDOQCAOAGXTEBZ-UHFFFAOYSA-N 0.000 claims abstract description 26
- 239000010410 layer Substances 0.000 claims description 50
- 239000003365 glass fiber Substances 0.000 claims description 16
- 239000002994 raw material Substances 0.000 claims description 15
- 239000011241 protective layer Substances 0.000 claims description 14
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims description 12
- 238000006068 polycondensation reaction Methods 0.000 claims description 12
- 229920002545 silicone oil Polymers 0.000 claims description 12
- 238000003756 stirring Methods 0.000 claims description 12
- 238000001035 drying Methods 0.000 claims description 9
- 239000007789 gas Substances 0.000 claims description 9
- 239000011521 glass Substances 0.000 claims description 9
- 238000002844 melting Methods 0.000 claims description 9
- 230000008018 melting Effects 0.000 claims description 9
- 238000002156 mixing Methods 0.000 claims description 9
- 239000000203 mixture Substances 0.000 claims description 9
- 229920002620 polyvinyl fluoride Polymers 0.000 claims description 9
- 229920002799 BoPET Polymers 0.000 claims description 8
- 238000004140 cleaning Methods 0.000 claims description 7
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 claims description 6
- UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 claims description 6
- 239000002253 acid Substances 0.000 claims description 6
- 238000006243 chemical reaction Methods 0.000 claims description 6
- DOIRQSBPFJWKBE-UHFFFAOYSA-N dibutyl phthalate Chemical compound CCCCOC(=O)C1=CC=CC=C1C(=O)OCCCC DOIRQSBPFJWKBE-UHFFFAOYSA-N 0.000 claims description 6
- 230000032050 esterification Effects 0.000 claims description 6
- 238000005886 esterification reaction Methods 0.000 claims description 6
- 239000001257 hydrogen Substances 0.000 claims description 6
- 229910052739 hydrogen Inorganic materials 0.000 claims description 6
- 238000000465 moulding Methods 0.000 claims description 6
- 125000000391 vinyl group Chemical group [H]C([*])=C([H])[H] 0.000 claims description 6
- 229920002554 vinyl polymer Polymers 0.000 claims description 6
- 239000012528 membrane Substances 0.000 claims description 5
- 238000013329 compounding Methods 0.000 claims description 4
- 239000000835 fiber Substances 0.000 claims description 4
- 238000007731 hot pressing Methods 0.000 claims description 4
- 238000004519 manufacturing process Methods 0.000 claims description 4
- 239000000463 material Substances 0.000 claims description 4
- 239000003921 oil Substances 0.000 claims description 4
- 238000005096 rolling process Methods 0.000 claims description 4
- XRBXGZZMKCBTFP-UHFFFAOYSA-N 4-(2,2-dihydroxyethoxycarbonyl)benzoic acid Chemical compound OC(O)COC(=O)C1=CC=C(C(O)=O)C=C1 XRBXGZZMKCBTFP-UHFFFAOYSA-N 0.000 claims description 3
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims description 3
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 claims description 3
- LFQSCWFLJHTTHZ-UHFFFAOYSA-N Ethanol Chemical compound CCO LFQSCWFLJHTTHZ-UHFFFAOYSA-N 0.000 claims description 3
- 229910000629 Rh alloy Inorganic materials 0.000 claims description 3
- PNEYBMLMFCGWSK-UHFFFAOYSA-N aluminium oxide Inorganic materials [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 claims description 3
- 229910052810 boron oxide Inorganic materials 0.000 claims description 3
- BRPQOXSCLDDYGP-UHFFFAOYSA-N calcium oxide Chemical compound [O-2].[Ca+2] BRPQOXSCLDDYGP-UHFFFAOYSA-N 0.000 claims description 3
- 239000000292 calcium oxide Substances 0.000 claims description 3
- ODINCKMPIJJUCX-UHFFFAOYSA-N calcium oxide Inorganic materials [Ca]=O ODINCKMPIJJUCX-UHFFFAOYSA-N 0.000 claims description 3
- 229910052799 carbon Inorganic materials 0.000 claims description 3
- 229910002091 carbon monoxide Inorganic materials 0.000 claims description 3
- 238000005266 casting Methods 0.000 claims description 3
- 239000003795 chemical substances by application Substances 0.000 claims description 3
- 238000000748 compression moulding Methods 0.000 claims description 3
- 238000001816 cooling Methods 0.000 claims description 3
- JKWMSGQKBLHBQQ-UHFFFAOYSA-N diboron trioxide Chemical compound O=BOB=O JKWMSGQKBLHBQQ-UHFFFAOYSA-N 0.000 claims description 3
- 238000002036 drum drying Methods 0.000 claims description 3
- 239000008187 granular material Substances 0.000 claims description 3
- 238000010438 heat treatment Methods 0.000 claims description 3
- 229910052742 iron Inorganic materials 0.000 claims description 3
- 239000007788 liquid Substances 0.000 claims description 3
- 239000000395 magnesium oxide Substances 0.000 claims description 3
- CPLXHLVBOLITMK-UHFFFAOYSA-N magnesium oxide Inorganic materials [Mg]=O CPLXHLVBOLITMK-UHFFFAOYSA-N 0.000 claims description 3
- AXZKOIWUVFPNLO-UHFFFAOYSA-N magnesium;oxygen(2-) Chemical compound [O-2].[Mg+2] AXZKOIWUVFPNLO-UHFFFAOYSA-N 0.000 claims description 3
- 239000000155 melt Substances 0.000 claims description 3
- 239000012452 mother liquor Substances 0.000 claims description 3
- 229910052757 nitrogen Inorganic materials 0.000 claims description 3
- TWNQGVIAIRXVLR-UHFFFAOYSA-N oxo(oxoalumanyloxy)alumane Chemical compound O=[Al]O[Al]=O TWNQGVIAIRXVLR-UHFFFAOYSA-N 0.000 claims description 3
- PXXKQOPKNFECSZ-UHFFFAOYSA-N platinum rhodium Chemical compound [Rh].[Pt] PXXKQOPKNFECSZ-UHFFFAOYSA-N 0.000 claims description 3
- 229920006267 polyester film Polymers 0.000 claims description 3
- 238000003825 pressing Methods 0.000 claims description 3
- 238000004537 pulping Methods 0.000 claims description 3
- 239000011347 resin Substances 0.000 claims description 3
- 229920005989 resin Polymers 0.000 claims description 3
- 239000000377 silicon dioxide Substances 0.000 claims description 3
- 235000012239 silicon dioxide Nutrition 0.000 claims description 3
- 238000004513 sizing Methods 0.000 claims description 3
- 239000002002 slurry Substances 0.000 claims description 3
- KKCBUQHMOMHUOY-UHFFFAOYSA-N sodium oxide Chemical compound [O-2].[Na+].[Na+] KKCBUQHMOMHUOY-UHFFFAOYSA-N 0.000 claims description 3
- 229910001948 sodium oxide Inorganic materials 0.000 claims description 3
- 238000009966 trimming Methods 0.000 claims description 3
- 238000005303 weighing Methods 0.000 claims description 3
- 238000005491 wire drawing Methods 0.000 claims description 3
- 230000000694 effects Effects 0.000 abstract description 6
- 230000017525 heat dissipation Effects 0.000 abstract description 4
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 description 3
- 239000012790 adhesive layer Substances 0.000 description 3
- 229910052710 silicon Inorganic materials 0.000 description 3
- 239000010703 silicon Substances 0.000 description 3
- 239000000428 dust Substances 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 1
- 229910000831 Steel Inorganic materials 0.000 description 1
- 230000004075 alteration Effects 0.000 description 1
- 229910052782 aluminium Inorganic materials 0.000 description 1
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000011247 coating layer Substances 0.000 description 1
- 229910052802 copper Inorganic materials 0.000 description 1
- 239000010949 copper Substances 0.000 description 1
- 230000006866 deterioration Effects 0.000 description 1
- 230000005611 electricity Effects 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000003068 static effect Effects 0.000 description 1
- 239000010959 steel Substances 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 229910000859 α-Fe Inorganic materials 0.000 description 1
Images
Classifications
-
- 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
- H05K1/00—Printed circuits
- H05K1/02—Details
- H05K1/0213—Electrical arrangements not otherwise provided for
- H05K1/0216—Reduction of cross-talk, noise or electromagnetic interference
- H05K1/0218—Reduction of cross-talk, noise or electromagnetic interference by printed shielding conductors, ground planes or power plane
- H05K1/0219—Printed shielding conductors for shielding around or between signal conductors, e.g. coplanar or coaxial printed shielding conductors
-
- 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
- H05K1/00—Printed circuits
- H05K1/02—Details
- H05K1/0201—Thermal arrangements, e.g. for cooling, heating or preventing overheating
- H05K1/0203—Cooling of mounted components
- H05K1/0209—External configuration of printed circuit board adapted for heat dissipation, e.g. lay-out of conductors, coatings
Landscapes
- Engineering & Computer Science (AREA)
- Microelectronics & Electronic Packaging (AREA)
- Physics & Mathematics (AREA)
- Electromagnetism (AREA)
- Shielding Devices Or Components To Electric Or Magnetic Fields (AREA)
- Laminated Bodies (AREA)
Abstract
The invention discloses a reflection-type electromagnetic shielding film for a Flexible Printed Circuit (FPC), which belongs to the technical field of electromagnetic shielding films and comprises a carrier film, wherein a heat-conducting silica gel layer is attached to the lower surface of the carrier film, a first insulating coating is attached to the lower surface of the heat-conducting silica gel layer, a second insulating coating is attached to the lower surface of the first insulating coating, and a carboxyl iron powder coating is attached to the lower surface of the second insulating coating; according to the invention, the carboxyl iron powder coating is arranged on the two surfaces of the insulating coating, the wave-absorbing layer is arranged on the surface of the electromagnetic wave reflecting coating, and the carboxyl iron powder coating and the wave-absorbing layer are arranged, so that the shielding modes are diversified, and the electromagnetic shielding effect is improved; according to the invention, the heat-conducting silica gel layer is formed on the carrier film, and heat conduction is carried out through the heat-conducting silica gel layer, so that the heat dissipation effect is improved.
Description
Technical Field
The invention belongs to the technical field of electromagnetic shielding films, and particularly relates to a reflection-type electromagnetic shielding film for an FPC (flexible printed circuit) and a preparation method thereof.
Background
Magnetic shielding in a region of space, means for reducing the field strength caused by certain sources. In most cases, the shield can be made of metal such as copper, aluminum, steel, etc., but for constant and very low frequency magnetic fields, materials such as ferrite can also be used as the shield. Electromagnetic noise or interference is often generated in one system or among different systems to cause system performance deterioration, so that firstly, the power line or the magnetic line is required to be limited in a certain area; secondly, a certain area is not influenced by external electric force lines and magnetic force lines.
The prior art has the following problems: the existing reflection-type electromagnetic shielding film has poor protection effect when in use, is easy to scratch, and is easy to accumulate dust on the surface, so that the cleaning is inconvenient; the electromagnetic shielding effect is not ideal, the way is single, the use safety is low, heat is generated to the FPC circuit, heat conduction and heat dissipation cannot be carried out in time, and hidden dangers exist.
Disclosure of Invention
To solve the problems set forth in the background art described above. The invention provides a reflection-type electromagnetic shielding film for an FPC (flexible printed circuit), which has the characteristics of simple structure, good protection, portability in cleaning, ideal electromagnetic shielding and quick heat dissipation.
Another object of the present invention is to provide a method for manufacturing a reflective electromagnetic shielding film for FPC.
In order to achieve the purpose, the invention provides the following technical scheme: the utility model provides a FPC is with reflection-type electromagnetic shield membrane, includes the carrier membrane, the lower surface of carrier membrane adheres to there is the heat conduction silica gel layer, the lower surface on heat conduction silica gel layer adheres to insulating coating one, the lower surface of insulating coating one adheres to insulating coating two, the lower surface of insulating coating two is adhered to carboxyl iron powder coating, the lower surface of carboxyl iron powder coating is adhered to electromagnetic wave reflective coating, electromagnetic wave reflective coating's lower surface is adhered to and is absorbed the layer, the lower surface of absorbing the layer is adhered to and is had glass fibre net protective layer.
Further, the carrier film is a PET film, the thickness of the PET film is 20-80 μm, and the preparation process comprises the following steps:
stirring dihydric alcohol and dibasic acid in a certain molar ratio in a pulping kettle, continuously conveying the mixture to an esterification kettle containing dihydroxyethyl terephthalate mother liquor by a slurry pump, and esterifying at normal pressure;
secondly, after a certain esterification rate is reached, pressing the mixture into a polycondensation kettle by using nitrogen, stirring the mixture in the kettle in a frame shape, representing the reaction degree by using stirring current, performing polycondensation under a certain vacuum degree, stopping polycondensation when the stirring current of the polycondensation kettle reaches a certain value, and extruding the melt into granules;
and thirdly, slicing and drying the cut raw materials in a vacuum drum drying device, and preparing the PET film on a 6 kt/aPET film production line of an instrumented polyester film factory.
Further, the heat-conducting silica gel layer is heat-conducting silica gel, the thickness of the heat-conducting silica gel layer is 20-80 μm, and the preparation process comprises the following steps:
firstly, taking a proper amount of vinyl silicone oil/hydrogen-containing silicone oil with a molar ratio of 1: 1.2, respectively and fully and uniformly mixing the vinyl silicone oil and the hydrogen-containing silicone oil with a certain amount of alumina powder, then adding a certain amount of chloroplatinic acid, and uniformly mixing;
transferring the uniformly mixed raw materials into a mold, placing the mold into a vacuum oven to exhaust and deflate, repeating the steps for several times, removing bubbles, then performing compression molding, performing curing for 2 hours at the temperature of 80 ℃, cooling to room temperature, and taking out.
Further, the thickness of the carboxyl iron powder coating is 5-20 μm, and the preparation process comprises the following steps:
firstly, forming mixed gas by carbonyl iron steam and carbon monoxide gas, and introducing the mixed gas from the upper part of a decomposer to decompose and generate metallic iron;
secondly, controlling the pressure of the decomposer to be 3-15 KPa, and controlling the internal temperature of the decomposer to form three sections of temperature zones from top to bottom, wherein the temperature of the first section is 270-310 ℃, the temperature of the second section is 290-330 ℃, and the temperature of the third section is 250-310 ℃, so as to obtain carbonyl iron powder with the carbon content ranging from 0.6% to 0.8%.
Further, the wave absorbing layer is a polyvinyl fluoride film, the thickness of the wave absorbing layer is 5-20 μm, and the preparation process comprises the following steps:
firstly, adding quantitative polyvinyl fluoride resin and 1% dibutyl phthalate into a reaction tank, and drying, heating, extruding and molding the raw materials in sequence;
and secondly, transversely stretching the molding raw material through a casting machine, longitudinally stretching, trimming and coiling to obtain the polyvinyl fluoride film.
In the invention, the thickness of the glass fiber net protective layer is 20-60 μm, and the preparation process comprises the following steps:
accurately calculating the dosage of silicon dioxide, aluminum oxide, calcium oxide, boron oxide, magnesium oxide and sodium oxide, weighing and mixing fine powder of each raw material, and putting the fine powder into a glass melting furnace;
secondly, melting at high temperature to prepare glass, arranging a porous bushing plate made of platinum-rhodium alloy at the bottom of a melting furnace material channel, drawing by a high-speed running wire drawing machine when glass liquid flows out of the bushing plate holes, and coating a sizing agent to prepare fibers, also called protofilaments;
thirdly, the protofilament is twisted by a twisting machine, and is warped by a warping machine, and the like, and the glass fiber net can be woven.
Further, the electromagnetic wave reflecting coating is arranged on the surface of the carboxyl iron powder coating, and the thickness of the electromagnetic wave reflecting coating (6) is 10-15 μm.
In the invention, the heat-conducting silica gel layer is integrally formed on the surface of the carrier film by a coating mode.
Further, the reflective electromagnetic shielding film for FPC according to the present invention is prepared by the following steps:
providing a carrier film;
cleaning oil stains and foreign matters on the surface of the carrier film, and forming a heat-conducting silica gel layer on the carrier film;
thirdly, coating a layer of insulating coating I on the surface of the heat-conducting silicon adhesive layer;
fourthly, coating a layer of prepared second insulating coating on the surface of the first insulating coating;
drying the surface of the second insulating coating, and then coating a prepared carboxyl iron powder coating;
sixthly, coating an electromagnetic wave reflection coating on the surface of the carboxyl iron powder coating;
seventh, a wave absorbing layer is arranged on the surface of the electromagnetic wave reflection coating, and a glass fiber net protective layer is arranged on the surface of the wave absorbing layer;
eighthly, hot-pressing and compounding the coated and overlapped reflection-type electromagnetic shielding film, and then rolling
Compared with the prior art, the invention has the beneficial effects that:
1. according to the invention, the glass fiber net protective layer is arranged on the surface of the wave absorbing layer, so that the structure is stable, the tensile property is strong, static electricity is not accumulated on the surface, the glass fiber net protective layer plays a role in protection, and the surface of the glass fiber net protective layer is not easy to accumulate dust, so that the cleaning is convenient;
2. according to the invention, the carboxyl iron powder coating is arranged on the two surfaces of the insulating coating, the wave-absorbing layer is arranged on the surface of the electromagnetic wave reflecting coating, and the carboxyl iron powder coating and the wave-absorbing layer are arranged, so that the shielding modes are diversified, and the electromagnetic shielding effect is improved;
3. according to the invention, the heat-conducting silica gel layer is formed on the carrier film, and heat conduction is carried out through the heat-conducting silica gel layer, so that the heat on the surface of the FPC is quickly dissipated, and the heat dissipation effect is improved.
Drawings
FIG. 1 is a schematic structural view of the present invention;
in the figure: 1. a carrier film; 2. a heat conductive silica gel layer; 3. insulating coating one; 4. a second insulating coating; 5. a carboxyl iron powder coating; 6. an electromagnetic wave reflective coating; 7. a wave-absorbing layer; 8. a glass fiber net protective layer.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Referring to fig. 1, the present invention provides the following technical solutions: the utility model provides a FPC is with reflection-type electromagnetic shield membrane, including carrier film 1, the lower surface of carrier film 1 adheres to there is heat conduction silica gel layer 2, the lower surface of heat conduction silica gel layer 2 adheres to insulating coating 3, the lower surface of insulating coating 3 adheres to insulating coating two 4, the lower surface of insulating coating two (4) adheres to carboxyl iron powder coating 5, the lower surface of carboxyl iron powder coating 5 adheres to electromagnetic wave reflection coating 6, the lower surface of electromagnetic wave reflection coating 6 adheres to and has inhale wave layer 7, the lower surface of inhale wave layer 7 adheres to and has fibre net protective layer 8.
Further, the carrier film 1 is a PET film with a thickness of 20-80 μm, and the preparation process is as follows:
stirring dihydric alcohol and dibasic acid in a certain molar ratio in a pulping kettle, continuously conveying the mixture to an esterification kettle containing dihydroxyethyl terephthalate mother liquor by a slurry pump, and esterifying at normal pressure;
secondly, after a certain esterification rate is reached, pressing the mixture into a polycondensation kettle by using nitrogen, stirring the mixture in the kettle in a frame shape, representing the reaction degree by using stirring current, performing polycondensation under a certain vacuum degree, stopping polycondensation when the stirring current of the polycondensation kettle reaches a certain value, and extruding the melt into granules;
and thirdly, slicing and drying the cut raw materials in a vacuum drum drying device, and preparing the PET film on a 6 kt/aPET film production line of an instrumented polyester film factory.
Further, the heat-conducting silica gel layer 2 is heat-conducting silica gel, the thickness of the heat-conducting silica gel layer is 20-80 μm, and the preparation process comprises the following steps:
firstly, taking a proper amount of vinyl silicone oil/hydrogen-containing silicone oil with a molar ratio of 1: 1.2, respectively and fully and uniformly mixing the vinyl silicone oil and the hydrogen-containing silicone oil with a certain amount of alumina powder, then adding a certain amount of chloroplatinic acid, and uniformly mixing;
transferring the uniformly mixed raw materials into a mold, placing the mold into a vacuum oven to exhaust and deflate, repeating the steps for several times, removing bubbles, then performing compression molding, performing curing for 2 hours at the temperature of 80 ℃, cooling to room temperature, and taking out.
Further, the thickness of the carboxyl iron powder coating 5 is 5-20 μm, and the preparation process is as follows:
firstly, forming mixed gas by carbonyl iron steam and carbon monoxide gas, and introducing the mixed gas from the upper part of a decomposer to decompose and generate metallic iron;
secondly, controlling the pressure of the decomposer to be 3-15 KPa, and controlling the internal temperature of the decomposer to form three sections of temperature zones from top to bottom, wherein the temperature of the first section is 270-310 ℃, the temperature of the second section is 290-330 ℃, and the temperature of the third section is 250-310 ℃, so as to obtain carbonyl iron powder with the carbon content ranging from 0.6% to 0.8%.
Further, the wave absorbing layer 7 is a polyvinyl fluoride film with the thickness of 5-20 μm, and the preparation process is as follows:
firstly, adding quantitative polyvinyl fluoride resin and 1% dibutyl phthalate into a reaction tank, and drying, heating, extruding and molding the raw materials in sequence;
and secondly, transversely stretching the molding raw material through a casting machine, longitudinally stretching, trimming and coiling to obtain the polyvinyl fluoride film.
Further, the thickness of the glass fiber net protective layer 8 is 20-60 μm, and the preparation process is as follows:
accurately calculating the dosage of silicon dioxide, aluminum oxide, calcium oxide, boron oxide, magnesium oxide and sodium oxide, weighing and mixing fine powder of each raw material, and putting the fine powder into a glass melting furnace;
secondly, melting at high temperature to prepare glass, arranging a porous bushing plate made of platinum-rhodium alloy at the bottom of a melting furnace material channel, drawing by a high-speed running wire drawing machine when glass liquid flows out of the bushing plate holes, and coating a sizing agent to prepare fibers, also called protofilaments;
thirdly, the protofilament is twisted by a twisting machine, and is warped by a warping machine, and the like, and the glass fiber net can be woven.
Furthermore, the electromagnetic wave reflecting coating 6 is arranged on the surface of the carboxyl iron powder coating 5, and the thickness of the electromagnetic wave reflecting coating 6 is 10-15 μm.
Further, the heat-conducting silica gel layer 2 is integrally formed on the surface of the carrier film 1 by a coating method.
Further, the preparation method of the reflection-type electromagnetic shielding film for the FPC comprises the following steps:
providing a carrier film 1;
cleaning oil stains and foreign matters on the surface of the carrier film 1, and forming a heat-conducting silica gel layer 2 on the carrier film 1;
thirdly, coating an insulating coating layer I3 on the surface of the heat-conducting silicon adhesive layer 2;
fourthly, coating a layer of prepared second insulating coating 4 on the surface of the first insulating coating 3;
after the surface of the second insulating coating 4 is dried, a prepared carboxyl iron powder coating 5 is coated;
sixthly, coating an electromagnetic wave reflection coating 6 on the surface of the carboxyl iron powder coating 5;
seventhly, arranging a wave absorbing layer 7 on the surface of the electromagnetic wave reflecting coating 6, and arranging a glass fiber net protective layer 8 on the surface of the wave absorbing layer 7;
and eighthly, hot-pressing and compounding the coated and overlapped reflection-type electromagnetic shielding film, and then rolling.
Example 1
The working principle and the using process of the invention are as follows: the invention provides a carrier film 1; cleaning oil stains and foreign matters on the surface of a carrier film 1, and forming a heat-conducting silica gel layer 2 on the carrier film 1; coating an insulating coating I3 on the surface of the heat-conducting silicon adhesive layer 2; coating a prepared second insulating coating 4 on the surface of the first insulating coating 3; drying the surface of the second insulating coating 4, and then coating a prepared carboxyl iron powder coating 5; coating an electromagnetic wave reflection coating 6 on the surface of the carboxyl iron powder coating 5; a wave absorbing layer 7 is arranged on the surface of the electromagnetic wave reflecting coating 6, and a glass fiber net protective layer 8 is arranged on the surface of the wave absorbing layer 7; and carrying out hot-pressing compounding on the reflection-type electromagnetic shielding film which is coated and overlapped, and then rolling.
Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.
Claims (9)
1. A reflection-type electromagnetic shielding film for FPC, comprising a carrier film (1), characterized in that: the lower surface of carrier membrane (1) is adhered to and is had heat conduction silica gel layer (2), the lower surface of heat conduction silica gel layer (2) is adhered to and is had insulating coating (3), the lower surface of insulating coating (3) is adhered to and is had insulating coating two (4), the lower surface of insulating coating two (4) is adhered to and is had carboxyl iron powder coating (5), the lower surface of carboxyl iron powder coating (5) is adhered to and is had electromagnetic wave reflective coating (6), the lower surface of electromagnetic wave reflective coating (6) is adhered to and is had microwave absorbing layer (7), the lower surface of microwave absorbing layer (7) is adhered to and is had glass fibre net protective layer (8).
2. The reflective electromagnetic shielding film for FPC as claimed in claim 1, wherein: the carrier film (1) is a PET film, the thickness of the PET film is 20-80 μm, and the preparation process comprises the following steps:
stirring dihydric alcohol and dibasic acid in a certain molar ratio in a pulping kettle, continuously conveying the mixture to an esterification kettle containing dihydroxyethyl terephthalate mother liquor by a slurry pump, and esterifying at normal pressure;
secondly, after a certain esterification rate is reached, pressing the mixture into a polycondensation kettle by using nitrogen, stirring the mixture in the kettle in a frame shape, representing the reaction degree by using stirring current, performing polycondensation under a certain vacuum degree, stopping polycondensation when the stirring current of the polycondensation kettle reaches a certain value, and extruding the melt into granules;
and thirdly, slicing and drying the cut raw materials in a vacuum drum drying device, and preparing the PET film on a 6 kt/aPET film production line of an instrumented polyester film factory.
3. The reflective electromagnetic shielding film for FPC as claimed in claim 1, wherein: the heat-conducting silica gel layer (2) is heat-conducting silica gel, the thickness of the heat-conducting silica gel layer is 20-80 mu m, and the preparation process comprises the following steps:
firstly, taking a proper amount of vinyl silicone oil/hydrogen-containing silicone oil with a molar ratio of 1: 1.2, respectively and fully and uniformly mixing the vinyl silicone oil and the hydrogen-containing silicone oil with a certain amount of alumina powder, then adding a certain amount of chloroplatinic acid, and uniformly mixing;
transferring the uniformly mixed raw materials into a mold, placing the mold into a vacuum oven to exhaust and deflate, repeating the steps for several times, removing bubbles, then performing compression molding, performing curing for 2 hours at the temperature of 80 ℃, cooling to room temperature, and taking out.
4. The reflective electromagnetic shielding film for FPC as claimed in claim 1, wherein: the thickness of the carboxyl iron powder coating (5) is 5-20 μm, and the preparation process comprises the following steps:
firstly, forming mixed gas by carbonyl iron steam and carbon monoxide gas, and introducing the mixed gas from the upper part of a decomposer to decompose and generate metallic iron;
secondly, controlling the pressure of the decomposer to be 3-15 KPa, and controlling the internal temperature of the decomposer to form three sections of temperature zones from top to bottom, wherein the temperature of the first section is 270-310 ℃, the temperature of the second section is 290-330 ℃, and the temperature of the third section is 250-310 ℃, so as to obtain carbonyl iron powder with the carbon content ranging from 0.6% to 0.8%.
5. The reflective electromagnetic shielding film for FPC as claimed in claim 1, wherein: the wave-absorbing layer (7) is a polyvinyl fluoride film, the thickness of the wave-absorbing layer is 5-20 mu m, and the preparation process comprises the following steps:
firstly, adding quantitative polyvinyl fluoride resin and 1% dibutyl phthalate into a reaction tank, and drying, heating, extruding and molding the raw materials in sequence;
and secondly, transversely stretching the molding raw material through a casting machine, longitudinally stretching, trimming and coiling to obtain the polyvinyl fluoride film.
6. The reflective electromagnetic shielding film for FPC as claimed in claim 1, wherein: the thickness of the glass fiber net protective layer (8) is 20-60 mu m, and the preparation process is as follows:
accurately calculating the dosage of silicon dioxide, aluminum oxide, calcium oxide, boron oxide, magnesium oxide and sodium oxide, weighing and mixing fine powder of each raw material, and putting the fine powder into a glass melting furnace;
secondly, melting at high temperature to prepare glass, arranging a porous bushing plate made of platinum-rhodium alloy at the bottom of a melting furnace material channel, drawing by a high-speed running wire drawing machine when glass liquid flows out of the bushing plate holes, and coating a sizing agent to prepare fibers, also called protofilaments;
thirdly, the protofilament is twisted by a twisting machine, and is warped by a warping machine, and the like, and the glass fiber net can be woven.
7. The reflective electromagnetic shielding film for FPC as claimed in claim 1, wherein: the electromagnetic wave reflection coating (6) is arranged on the surface of the carboxyl iron powder coating (5), and the thickness of the electromagnetic wave reflection coating (6) is 10-15 mu m.
8. The reflective electromagnetic shielding film for FPC as claimed in claim 1, wherein: the heat-conducting silica gel layer (2) is integrally formed on the surface of the carrier film (1) in a coating mode.
9. A reflection type electromagnetic shielding film for FPC as claimed in any one of claims 1 to 8, wherein: the preparation method of the reflection-type electromagnetic shielding film for the FPC comprises the following steps:
providing a carrier film (1);
secondly, cleaning oil stains and foreign matters on the surface of the carrier film (1), and forming a heat-conducting silica gel layer (2) on the carrier film (1);
thirdly, coating an insulating coating I (3) on the surface of the heat-conducting silica gel layer (2);
fourthly, coating a layer of prepared second insulating coating (4) on the surface of the first insulating coating (3);
drying the surface of the second insulating coating (4) and then coating a prepared carboxyl iron powder coating (5);
sixthly, coating an electromagnetic wave reflection coating (6) on the surface of the carboxyl iron powder coating (5);
seventh, a wave absorbing layer (7) is arranged on the surface of the electromagnetic wave reflecting coating (6), and a glass fiber net protective layer (8) is arranged on the surface of the wave absorbing layer (7);
and eighthly, hot-pressing and compounding the coated and overlapped reflection-type electromagnetic shielding film, and then rolling.
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| CN202010753503.1A CN111787685A (en) | 2020-07-30 | 2020-07-30 | Reflection-type electromagnetic shielding film for FPC and preparation method thereof |
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| CN202010753503.1A CN111787685A (en) | 2020-07-30 | 2020-07-30 | Reflection-type electromagnetic shielding film for FPC and preparation method thereof |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN112867378A (en) * | 2021-01-08 | 2021-05-28 | 武汉华星光电半导体显示技术有限公司 | Electromagnetic shielding film, display panel and display device |
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