CN114083917B - Heat transfer film and preparation method and application thereof - Google Patents
Heat transfer film and preparation method and application thereof Download PDFInfo
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- CN114083917B CN114083917B CN202111200609.XA CN202111200609A CN114083917B CN 114083917 B CN114083917 B CN 114083917B CN 202111200609 A CN202111200609 A CN 202111200609A CN 114083917 B CN114083917 B CN 114083917B
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- 238000012546 transfer Methods 0.000 title claims abstract description 63
- 238000002360 preparation method Methods 0.000 title claims abstract description 16
- 239000000463 material Substances 0.000 claims abstract description 42
- 229920006231 aramid fiber Polymers 0.000 claims abstract description 27
- 239000004020 conductor Substances 0.000 claims abstract description 27
- 239000000945 filler Substances 0.000 claims abstract description 20
- 239000012779 reinforcing material Substances 0.000 claims abstract description 19
- NIXOWILDQLNWCW-UHFFFAOYSA-M Acrylate Chemical compound [O-]C(=O)C=C NIXOWILDQLNWCW-UHFFFAOYSA-M 0.000 claims abstract description 18
- 239000003795 chemical substances by application Substances 0.000 claims abstract description 18
- 239000007822 coupling agent Substances 0.000 claims abstract description 18
- 229920001971 elastomer Polymers 0.000 claims abstract description 18
- 239000004005 microsphere Substances 0.000 claims abstract description 10
- 238000005187 foaming Methods 0.000 claims abstract description 9
- PEVRKKOYEFPFMN-UHFFFAOYSA-N 1,1,2,3,3,3-hexafluoroprop-1-ene;1,1,2,2-tetrafluoroethene Chemical group FC(F)=C(F)F.FC(F)=C(F)C(F)(F)F PEVRKKOYEFPFMN-UHFFFAOYSA-N 0.000 claims abstract description 8
- 238000010438 heat treatment Methods 0.000 claims description 19
- 239000011248 coating agent Substances 0.000 claims description 17
- 238000000576 coating method Methods 0.000 claims description 17
- 238000002156 mixing Methods 0.000 claims description 12
- 239000002270 dispersing agent Substances 0.000 claims description 8
- 238000000034 method Methods 0.000 claims description 8
- 239000011230 binding agent Substances 0.000 claims description 7
- 238000000748 compression moulding Methods 0.000 claims description 6
- 238000003801 milling Methods 0.000 claims description 6
- 239000004760 aramid Substances 0.000 claims description 4
- 238000000227 grinding Methods 0.000 claims description 4
- 238000004073 vulcanization Methods 0.000 claims description 4
- 238000001723 curing Methods 0.000 claims description 3
- 238000007639 printing Methods 0.000 claims description 3
- 238000004519 manufacturing process Methods 0.000 claims 5
- 238000013007 heat curing Methods 0.000 claims 1
- 238000010023 transfer printing Methods 0.000 abstract description 14
- 239000003921 oil Substances 0.000 abstract description 13
- 238000009413 insulation Methods 0.000 abstract description 5
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 8
- PMHQVHHXPFUNSP-UHFFFAOYSA-M copper(1+);methylsulfanylmethane;bromide Chemical compound Br[Cu].CSC PMHQVHHXPFUNSP-UHFFFAOYSA-M 0.000 description 8
- 239000004744 fabric Substances 0.000 description 8
- 239000002245 particle Substances 0.000 description 7
- 238000012360 testing method Methods 0.000 description 7
- 239000006229 carbon black Substances 0.000 description 5
- KOMNUTZXSVSERR-UHFFFAOYSA-N 1,3,5-tris(prop-2-enyl)-1,3,5-triazinane-2,4,6-trione Chemical compound C=CCN1C(=O)N(CC=C)C(=O)N(CC=C)C1=O KOMNUTZXSVSERR-UHFFFAOYSA-N 0.000 description 4
- SECXISVLQFMRJM-UHFFFAOYSA-N N-Methylpyrrolidone Chemical compound CN1CCCC1=O SECXISVLQFMRJM-UHFFFAOYSA-N 0.000 description 4
- 238000001816 cooling Methods 0.000 description 4
- 238000007599 discharging Methods 0.000 description 4
- 229910021485 fumed silica Inorganic materials 0.000 description 4
- 238000000465 moulding Methods 0.000 description 4
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 3
- 229910021393 carbon nanotube Inorganic materials 0.000 description 3
- 239000002041 carbon nanotube Substances 0.000 description 3
- 239000002480 mineral oil Substances 0.000 description 3
- 235000010446 mineral oil Nutrition 0.000 description 3
- 238000010998 test method Methods 0.000 description 3
- 230000006835 compression Effects 0.000 description 2
- 238000007906 compression Methods 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 229910021392 nanocarbon Inorganic materials 0.000 description 2
- 238000011056 performance test Methods 0.000 description 2
- 238000003825 pressing Methods 0.000 description 2
- 239000000523 sample Substances 0.000 description 2
- 239000004576 sand Substances 0.000 description 2
- 238000002791 soaking Methods 0.000 description 2
- 239000007787 solid Substances 0.000 description 2
- 239000002904 solvent Substances 0.000 description 2
- 238000003756 stirring Methods 0.000 description 2
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000009835 boiling Methods 0.000 description 1
- 239000007767 bonding agent Substances 0.000 description 1
- 239000003990 capacitor Substances 0.000 description 1
- 239000003153 chemical reaction reagent Substances 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000010292 electrical insulation Methods 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 239000000377 silicon dioxide Substances 0.000 description 1
- 229920002379 silicone rubber Polymers 0.000 description 1
- 239000007858 starting material Substances 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
Classifications
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
- B41M—PRINTING, DUPLICATING, MARKING, OR COPYING PROCESSES; COLOUR PRINTING
- B41M5/00—Duplicating or marking methods; Sheet materials for use therein
- B41M5/025—Duplicating or marking methods; Sheet materials for use therein by transferring ink from the master sheet
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- B32—LAYERED PRODUCTS
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- B32B25/00—Layered products comprising a layer of natural or synthetic rubber
- B32B25/04—Layered products comprising a layer of natural or synthetic rubber comprising rubber as the main or only constituent of a layer, which is next to another layer of the same or of a different material
- B32B25/042—Layered products comprising a layer of natural or synthetic rubber comprising rubber as the main or only constituent of a layer, which is next to another layer of the same or of a different material of natural rubber or synthetic rubber
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- B32B25/00—Layered products comprising a layer of natural or synthetic rubber
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- B32B37/00—Methods or apparatus for laminating, e.g. by curing or by ultrasonic bonding
- B32B37/02—Methods or apparatus for laminating, e.g. by curing or by ultrasonic bonding characterised by a sequence of laminating steps, e.g. by adding new layers at consecutive laminating stations
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- B32B37/00—Methods or apparatus for laminating, e.g. by curing or by ultrasonic bonding
- B32B37/10—Methods or apparatus for laminating, e.g. by curing or by ultrasonic bonding characterised by the pressing technique, e.g. using action of vacuum or fluid pressure
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- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
- C08J5/00—Manufacture of articles or shaped materials containing macromolecular substances
- C08J5/18—Manufacture of films or sheets
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
- C08J9/00—Working-up of macromolecular substances to porous or cellular articles or materials; After-treatment thereof
- C08J9/0061—Working-up of macromolecular substances to porous or cellular articles or materials; After-treatment thereof characterized by the use of several polymeric components
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- C08J9/0066—Use of inorganic compounding ingredients
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- C08J9/0066—Use of inorganic compounding ingredients
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- C08J2333/00—Characterised by the use of homopolymers or copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and only one being terminated by only one carboxyl radical, or of salts, anhydrides, esters, amides, imides, or nitriles thereof; Derivatives of such polymers
- C08J2333/04—Characterised by the use of homopolymers or copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and only one being terminated by only one carboxyl radical, or of salts, anhydrides, esters, amides, imides, or nitriles thereof; Derivatives of such polymers esters
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
- C08J2477/00—Characterised by the use of polyamides obtained by reactions forming a carboxylic amide link in the main chain; Derivatives of such polymers
- C08J2477/10—Polyamides derived from aromatically bound amino and carboxyl groups of amino carboxylic acids or of polyamines and polycarboxylic acids
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- Chemical & Material Sciences (AREA)
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- Chemical Kinetics & Catalysis (AREA)
- Medicinal Chemistry (AREA)
- Health & Medical Sciences (AREA)
- Organic Chemistry (AREA)
- Manufacturing & Machinery (AREA)
- Inorganic Chemistry (AREA)
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- Nanotechnology (AREA)
- Compositions Of Macromolecular Compounds (AREA)
- Laminated Bodies (AREA)
Abstract
The invention belongs to the technical field of thermal transfer printing, and discloses a thermal transfer printing film and a preparation method and application thereof. The heat transfer film comprises a framework layer, an air cushion layer, a bearing layer and a transfer release layer which are sequentially arranged; the framework layer is made of aramid fiber modified by heat-conducting filler; the air cushion layer is mainly prepared from the following components: acrylate rubber, heat conduction materials, conductive materials, reinforcing materials, foaming microspheres, coupling agents and vulcanizing agents; the bearing layer is mainly prepared from the following components: acrylate rubber, a heat conduction material, a conductive material, a reinforcing material, a coupling agent and a vulcanizing agent; the transfer release layer is a perfluoroethylene propylene copolymer. The transfer film has the characteristics of excellent heat resistance and oil resistance, low surface tension, insulation and heat conduction, and is very suitable for transfer printing of electronic ink.
Description
Technical Field
The invention belongs to the technical field of heat transfer printing, and particularly relates to a heat transfer printing film and a preparation method and application thereof.
Background
The traditional heat transfer film or heat transfer cloth is mostly made of silicon rubber materials, and the performance of the traditional heat transfer film or heat transfer cloth can meet the transfer printing requirement of the conventional ink. However, for the printing of electronic ink, because of its high requirements for insulation/conductivity, heat resistance, oil resistance and surface tension, the existing thermal transfer film still cannot meet the requirements well. For example, the electronic ink usually contains a certain amount of mineral oil, and the existing thermal transfer film has poor oil resistance, so that the thermal transfer film is easy to deform and has greatly reduced strength; meanwhile, the surface tension of the existing heat transfer film is high, and high-sharpness transfer printing cannot be realized; moreover, the existing thermal transfer film has insufficient insulating and heat-conducting properties, and cannot well meet the requirements of heat conduction/electrical insulation when the thermal transfer film is contacted with the metal roller.
Accordingly, it is desirable to provide a novel thermal transfer film that is heat and oil resistant, thermally conductive, and has low surface tension.
Disclosure of Invention
The present invention is directed to solving at least one of the problems of the prior art described above. Therefore, the invention provides a heat transfer film, a preparation method and application thereof, and the heat transfer film has the characteristics of excellent heat resistance and oil resistance, low surface tension, insulation and heat conduction, and is very suitable for transfer printing of electronic ink.
The invention provides a heat transfer film, which comprises a framework layer, an air cushion layer, a bearing layer and a transfer release layer which are sequentially arranged;
the framework layer is made of heat-conducting filler modified aramid fiber; the air cushion layer is mainly prepared from the following components: acrylate rubber, a heat conduction material, a conductive material, a reinforcing material, foaming microspheres, a coupling agent and a vulcanizing agent; the bearing layer is mainly prepared from the following components: acrylate rubber, a heat conduction material, a conductive material, a reinforcing material, a coupling agent and a vulcanizing agent; the transfer release layer is a perfluoroethylene propylene copolymer.
The invention selects the aramid fiber as the basis of the framework layer, has the characteristics of high strength, high temperature resistance and good insulativity, but because the aramid fiber has poor heat conductivity, the invention carries out modification treatment on the aramid fiber and improves the heat-conducting property of the aramid fiber. Meanwhile, the bearing layer adopted by the invention has good heat conduction performance and oil-resistant and temperature-resistant performance, can effectively bear the transfer printing pressure and is conducted to the air cushion layer; the air cushion layer also has good heat conduction, oil resistance and temperature resistance, and the contained foaming microspheres enable the air cushion layer to generate directional deformation (mainly thickness deformation) under high pressure, and the air cushion layer can be quickly restored to the original shape after the pressure is released. The invention adopts the perfluoroethylene propylene copolymer as the composition of the transfer printing release layer, can effectively reduce the surface tension of the heat transfer printing film and has the characteristic of long service life. When the thermal transfer film is used, the thermal transfer film is used as a capacitor element and can provide voltage for transferring electronic ink, wherein the air cushion layer and the bearing layer can be charged, and the framework layer plays an insulating role.
Preferably, the preparation method of the heat-conducting modified aramid fiber comprises the following steps: mixing and grinding a binder, a dispersant and a heat-conducting filler to obtain a coating; and coating aramid fibers with the coating, and heating and curing to obtain the aramid fibers modified by the heat-conducting filler.
More preferably, the average particle size of the coating is 500nm or less.
More preferably, the heating curing method comprises the following steps: putting the coated aramid fiber into an oven, heating to 90-100 ℃, and keeping the temperature for 25-35min; continuously heating to 145-160 ℃, and keeping the temperature for 25-35min; then the temperature is raised to 255-265 ℃, and the temperature is kept for 55-70min.
More preferably, the coating comprises the following components in parts by weight: 90-110 parts of binder, 2-4 parts of dispersant and 5-10 parts of heat-conducting filler. The heat conducting filler can be selected from aluminum nitride.
Preferably, the heat conducting material is aluminum nitride.
Preferably, the conductive material is carbon nanotubes.
Preferably, the reinforcing material is carbon black and/or silica.
Preferably, the air cushion layer is prepared from the following components in parts by weight: 90-110 parts of acrylate rubber, 25-35 parts of heat conducting material, 8-12 parts of conducting material, 7-15 parts of reinforcing material, 8-12 parts of foaming microspheres, 3-5 parts of coupling agent and 2-4 parts of vulcanizing agent.
Preferably, the bearing layer is prepared from the following components in parts by weight: 90-110 parts of acrylate rubber, 25-35 parts of heat conducting material, 8-12 parts of conducting material, 7-15 parts of reinforcing material, 3-5 parts of coupling agent and 2-4 parts of vulcanizing agent.
The invention also provides a preparation method of the heat transfer film, which comprises the following steps:
sequentially putting the heat-conducting filler modified aramid fiber and the air cushion layer material into a mold, and carrying out compression molding; continuing to put the materials of the bearing layer, and carrying out compression molding; after vulcanization, coating a perfluoroethylene propylene copolymer, and heating and baking to obtain the heat transfer film;
the preparation method of the air cushion layer material comprises the following steps: mixing acrylate rubber, a heat conduction material, a conductive material, a reinforcing material, foaming microspheres and a coupling agent for banburying, and then adding a vulcanizing agent for open milling;
the preparation method of the bearing layer material comprises the following steps: mixing the acrylate rubber, the heat conducting material, the reinforcing material and the coupling agent for banburying, and then adding the vulcanizing agent for open mixing.
Preferably, the vulcanization treatment method comprises the following steps: vulcanizing at 115-125 deg.C for 110-130min, and vulcanizing at 165-175 deg.C for 110-130min.
Preferably, the heating and baking method comprises the following steps: baking at 150-170 deg.C for 20-35min.
The invention also provides application of the heat transfer film in electronic ink printing.
Compared with the prior art, the invention has the following beneficial effects:
aiming at the defect that the existing heat transfer film is difficult to meet the requirements of electronic ink transfer printing in the aspects of insulating heat-conducting property, heat resistance, oil resistance and surface tension, the heat transfer film has the characteristics of excellent heat resistance and oil resistance, low surface tension, insulation and heat conduction by adopting the framework layer, the air cushion layer, the bearing layer and the transfer printing release layer with more excellent performances, and is very suitable for the transfer printing of electronic ink.
Detailed Description
In order to make the technical solutions of the present invention more apparent to those skilled in the art, the following examples are given for illustration. It should be noted that the following examples are only preferred embodiments of the present invention, and the claimed protection scope is not limited thereto, and any modification, substitution, combination made without departing from the spirit and principle of the present invention are included in the protection scope of the present invention.
The starting materials, reagents or apparatuses used in the following examples are, unless otherwise specified, either commercially available from conventional sources or can be obtained by known methods.
Example 1
The embodiment provides a thermal transfer film, which comprises a framework layer, an air cushion layer, a bearing layer and a transfer release layer, wherein the framework layer, the air cushion layer, the bearing layer and the transfer release layer are sequentially arranged;
the preparation method of the heat transfer film in this embodiment includes the following steps:
(1) Selecting basf Matrimid 5218 and adopting NMP (N-methyl pyrrolidone) as a solvent to prepare a binder with the solid content of 20%; selecting Lumbo Solsperse 20000 as a dispersant, and selecting nano aluminum nitride as a heat-conducting filler;
adding 100 parts by weight of binder, 3 parts by weight of dispersant and 6 parts by weight of heat conducting filler into a sand mill with stirring, under the protection of circulating cooling of cold water (below 10 ℃), ensuring the temperature of the material to be less than or equal to 50 ℃, grinding for at least 8 hours, detecting by using a laser particle size detector, and finishing the preparation of the coating when the maximum particle size of particles in the material is less than or equal to 500 nm;
soaking the aramid fiber fabric into the prepared coating to ensure that the aramid fiber fabric is completely coated, putting the completely coated aramid fiber fabric into a vacuum oven, gradually heating to 90 ℃, and keeping the temperature for 30min; then heating to 150 ℃, and preserving the heat for 30min; continuing to heat to 260 ℃, preserving heat for 60min, and then cooling to room temperature to obtain the heat-conducting filler modified aramid fiber;
(2) Preparing an air cushion layer material: the following components in parts by weight are put into an internal mixer for internal mixing: 100 parts of acrylate rubber (Japanese Ruizhong H570 high-performance ACM), 30 parts of heat conducting material (nano aluminum nitride), 10 parts of conducting material (nano carbon tube), 10 parts of reinforcing material (carbon black N550 parts, fumed silica 2 parts), 10 parts of expanded foaming microspheres (Ackso 031DU 40) and 4 parts of coupling agent (Michigan A-1100); the heating temperature for banburying is 60 ℃, and the banburying time is 60min; discharging; adding the internally mixed material into an open mill, adding 2 parts by weight of a vulcanizing agent (triallyl isocyanurate), and open milling for 3 times to obtain an air cushion layer material;
preparing a material of a bearing layer: the following components in parts by weight are put into an internal mixer for internal mixing: 100 parts of acrylate rubber (Japanese Rueisen H570 high-performance ACM), 30 parts of heat conducting material (nano aluminum nitride), 10 parts of conducting material (carbon nano tube), 4 parts of reinforcing material (carbon black N550, 2 parts of fumed silica) and coupling agent (Ma picture A-1100); the heating temperature for banburying is 60 ℃, and the banburying time is 60min; discharging; adding the internally mixed material into an open mill, adding 2 parts by weight of a vulcanizing agent (triallyl isocyanurate), and open milling for 3 times to obtain a bearing layer material;
(3) Sequentially putting the heat-conducting filler modified aramid fiber and the air cushion layer material into a die, and performing compression molding by using a molding press with the weight of more than 10 tons; then, continuously adding materials of the bearing layer, and using a molding press with more than 10 tons to mold and form; the ratio of the materials of the air cushion layer to the materials of the bearing layer is 5;
vulcanizing at 120 deg.C for 120min, and vulcanizing at 170 deg.C for 120min; and coating a perfluoroethylene propylene copolymer (Dajin GLS-213 DRA), and baking at 160 ℃ for 30min to form a transfer release layer with the thickness of about 20 mu m, thereby finally preparing the heat transfer film.
Example 2
The embodiment provides a thermal transfer film, which comprises a skeleton layer, an air cushion layer, a bearing layer and a transfer release layer, wherein the skeleton layer, the air cushion layer, the bearing layer and the transfer release layer are sequentially arranged;
the preparation method of the heat transfer film in this embodiment includes the following steps:
(1) Selecting basf Matrimid 5218 and adopting NMP (N-methyl pyrrolidone) as a solvent to prepare a bonding agent with the solid content of 20 percent; selecting Lumbo Solsperse 20000 as a dispersant, and selecting nano aluminum nitride as a heat-conducting filler;
adding 95 parts by weight of binder, 4 parts by weight of dispersant and 7 parts by weight of heat conducting filler into a sand mill with stirring, under the protection of circulating cooling of cold water (below 10 ℃), ensuring the temperature of the material to be less than or equal to 50 ℃, grinding for at least 8 hours, detecting by using a laser particle size detector, and finishing the preparation of the coating when the maximum particle size of particles in the material is less than or equal to 500 nm;
soaking the aramid fiber fabric into the prepared coating to ensure that the aramid fiber fabric is completely coated, putting the completely coated aramid fiber fabric into a vacuum oven, gradually heating to 90 ℃, and keeping the temperature for 35min; then heating to 150 ℃, and preserving the heat for 30min; continuing to heat to 260 ℃, preserving the heat for 60min, and then cooling to room temperature to obtain the heat-conducting filler modified aramid fiber;
(2) Preparing an air cushion layer material: the following components in parts by weight are put into an internal mixer for internal mixing: 105 parts of acrylate rubber (Japanese Rueisen H570 high-performance ACM), 32 parts of heat conducting material (nano aluminum nitride), 10 parts of conducting material (carbon nano tube), 10 parts of reinforcing material (carbon black N550, 3 parts of fumed silica), 10 parts of expanded foamed microspheres (Acksu 031DU 40) and 4 parts of coupling agent (Magi graph A-1100); the heating temperature for banburying is 60 ℃, and the banburying time is 60min; discharging; adding the internally mixed material into an open mill, adding 2 parts by weight of a vulcanizing agent (triallyl isocyanurate), and open milling for 3 times to obtain an air cushion layer material;
preparing a material of a bearing layer: the following components in parts by weight are put into an internal mixer for internal mixing: 105 parts of acrylate rubber (Japanese Ruizhong H570 high-performance ACM), 32 parts of heat conducting material (nano aluminum nitride), 10 parts of conducting material (nano carbon tube), 7 parts of reinforcing material (carbon black N550, 3 parts of fumed silica) and 4 parts of coupling agent (Mitigo A-1100); discharging; adding the internally mixed material into an open mill, adding 2 parts by weight of a vulcanizing agent (triallyl isocyanurate), and open milling for 3 times to obtain a bearing layer material;
(3) Sequentially putting the heat-conducting filler modified aramid fiber and the air cushion layer material into a die, and performing compression molding by using a molding press with the weight of more than 10 tons; then continuously adding materials of the bearing layer, and using a mould pressing machine with more than 10 tons for mould pressing and molding; the ratio of the materials of the air cushion layer to the materials of the bearing layer is 5;
vulcanizing at 125 deg.C for 130min, and vulcanizing at 170 deg.C for 120min; and coating a perfluoroethylene propylene copolymer (Dajin GLS-213 DRA), and baking at 170 ℃ for 35min to form a transfer release layer with the thickness of about 20 mu m, thereby finally preparing the heat transfer film.
Product effectiveness testing
The heat transfer films obtained in examples 1 to 2 were subjected to the performance tests shown below, and the test results are shown in table 1.
The heat conduction test method comprises the following steps: a probe method;
the surface conductivity test method comprises the following steps: a probe method;
surface tension test method: schumann pilar dyne pen;
the heat-resistant oil-resistant load permanent compression set testing method comprises the following steps: the thickness of the thermal transfer film was measured with a micrometer and designated as H1. The pressure of 2 kg/square centimeter of the heat transfer film is given by an AIDebauer HPA manual pressure test machine, and the test machine is placed in a constant temperature oil pan filled with mineral oil with the boiling point of more than 200 ℃ to ensure that the mineral oil does not heat the heat transfer film. And heating the constant-temperature oil pan to 150 ℃ and keeping the temperature constant. And after 500 hours, taking out the testing machine, taking down the heat transfer film, standing at normal temperature for 24 hours, and testing the thickness of the heat transfer film by using a micrometer, wherein the mark is H2. The permanent compression set was calculated by the following formula.
Deformation (percent) = (H1-H2)/H1 × 100%
Table 1 heat transfer film performance test results
As shown in table 1, the thermal transfer film obtained in examples 1-2 of the present invention has excellent thermal conductivity, insulation property, low surface tension, heat resistance, oil resistance and low deformation (less than 5%), and is very suitable for use as a transfer medium of electronic ink.
The present invention is not limited to the above embodiments, and various changes can be made without departing from the spirit of the present invention within the knowledge of those skilled in the art. Furthermore, the embodiments and features of the embodiments of the present application may be combined with each other without conflict.
Claims (10)
1. The heat transfer film is characterized by comprising a framework layer, an air cushion layer, a bearing layer and a transfer release layer which are sequentially arranged;
the framework layer is made of aramid fiber modified by heat-conducting filler; the air cushion layer is mainly prepared from the following components: acrylate rubber, heat conduction materials, conductive materials, reinforcing materials, foaming microspheres, coupling agents and vulcanizing agents; the bearing layer is mainly prepared from the following components: acrylate rubber, a heat conduction material, a conductive material, a reinforcing material, a coupling agent and a vulcanizing agent; the transfer release layer is a perfluoroethylene propylene copolymer.
2. The thermal transfer film according to claim 1, wherein the preparation method of the thermal conductive filler-modified aramid fiber is as follows: mixing and grinding a binder, a dispersant and a heat-conducting filler to obtain a coating; and coating aramid fibers with the coating, and heating and curing to obtain the aramid fibers modified by the heat-conducting filler.
3. The thermal transfer film according to claim 2, wherein the heat curing method is: putting the coated aramid fiber into an oven, heating to 90-100 ℃, and keeping the temperature for 25-35min; continuously heating to 145-160 ℃, and keeping the temperature for 25-35min; then the temperature is raised to 255-265 ℃, and the temperature is kept for 55-70min.
4. The thermal transfer film of claim 2, wherein the coating comprises the following components in parts by weight: 90-110 parts of binder, 2-4 parts of dispersant and 5-10 parts of heat-conducting filler.
5. The thermal transfer film according to claim 1, wherein the air cushion layer is made from the following components in parts by weight: 90-110 parts of acrylate rubber, 25-35 parts of heat conduction material, 8-12 parts of conductive material, 7-15 parts of reinforcing material, 8-12 parts of foaming microsphere, 3-5 parts of coupling agent and 2-4 parts of vulcanizing agent.
6. The thermal transfer film according to claim 1, wherein the carrier layer is made from the following components in parts by weight: 90-110 parts of acrylate rubber, 25-35 parts of heat conducting material, 8-12 parts of conducting material, 7-15 parts of reinforcing material, 3-5 parts of coupling agent and 2-4 parts of vulcanizing agent.
7. The method for manufacturing a thermal transfer film according to any one of claims 1 to 6, characterized by comprising the steps of:
sequentially putting the heat-conducting filler modified aramid fiber and the air cushion layer material into a mold, and carrying out compression molding; continuing to put the materials of the bearing layer, and carrying out compression molding; after vulcanization, coating a perfluoroethylene propylene copolymer, and heating and baking to obtain the heat transfer film;
the preparation method of the air cushion layer material comprises the following steps: mixing acrylate rubber, a heat conduction material, a conductive material, a reinforcing material, foaming microspheres and a coupling agent for banburying, and then adding a vulcanizing agent for open milling;
the preparation method of the bearing layer material comprises the following steps: mixing the acrylate rubber, the heat conducting material, the reinforcing material and the coupling agent for banburying, and then adding the vulcanizing agent for open mixing.
8. The production method according to claim 7, wherein in the production method of the thermal transfer film, the vulcanization treatment is performed by: vulcanizing at 115-125 deg.C for 110-130min, and vulcanizing at 165-175 deg.C for 110-130min.
9. The manufacturing method according to claim 7, wherein in the manufacturing method of the thermal transfer film, the heating and baking method is: baking at 150-170 deg.C for 20-35min.
10. Use of the thermal transfer film of any of claims 1-6 in electronic ink printing.
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