CN109968846A - A kind of graphene coating process - Google Patents
A kind of graphene coating process Download PDFInfo
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- CN109968846A CN109968846A CN201910362266.3A CN201910362266A CN109968846A CN 109968846 A CN109968846 A CN 109968846A CN 201910362266 A CN201910362266 A CN 201910362266A CN 109968846 A CN109968846 A CN 109968846A
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- Prior art keywords
- graphene
- ink
- membrane material
- printing
- coated
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Classifications
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
- B41M—PRINTING, DUPLICATING, MARKING, OR COPYING PROCESSES; COLOUR PRINTING
- B41M1/00—Inking and printing with a printer's forme
- B41M1/12—Stencil printing; Silk-screen printing
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
- B41M—PRINTING, DUPLICATING, MARKING, OR COPYING PROCESSES; COLOUR PRINTING
- B41M1/00—Inking and printing with a printer's forme
- B41M1/26—Printing on other surfaces than ordinary paper
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
- B41M—PRINTING, DUPLICATING, MARKING, OR COPYING PROCESSES; COLOUR PRINTING
- B41M3/00—Printing processes to produce particular kinds of printed work, e.g. patterns
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
- B41M—PRINTING, DUPLICATING, MARKING, OR COPYING PROCESSES; COLOUR PRINTING
- B41M7/00—After-treatment of prints, e.g. heating, irradiating, setting of the ink, protection of the printed stock
- B41M7/0054—After-treatment of prints, e.g. heating, irradiating, setting of the ink, protection of the printed stock using protective coatings or film forming compositions cured by thermal means, e.g. infrared radiation, heat
-
- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09D—COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
- C09D11/00—Inks
- C09D11/02—Printing inks
- C09D11/03—Printing inks characterised by features other than the chemical nature of the binder
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- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- General Chemical & Material Sciences (AREA)
- Life Sciences & Earth Sciences (AREA)
- Engineering & Computer Science (AREA)
- Materials Engineering (AREA)
- Wood Science & Technology (AREA)
- Organic Chemistry (AREA)
- Paints Or Removers (AREA)
- Carbon And Carbon Compounds (AREA)
Abstract
The present invention relates to safeguard film for cellular phone production technical fields, specifically, being related to a kind of graphene coating process.The following steps are included: 1, prepare graphene ink;2, be coated printing with graphene ink: corona treatment carries out sided corona treatment to protective film raw material, and rotary screen-printing machine is by graphene ink coating and printing on the surface of protective film raw material;Dryer carries out drying and processing to the graphene ink being coated on protective film raw material, so that it is adhering completely to the surface of protective film raw material, finally obtains graphene coated product.Graphene coating process of the present invention is no longer limited on traditional equipment, coating efficiency greatly improves, Painting effect more preferably, Product Precision it is high, and graphene can be greatlyd save, avoid wasting.
Description
Technical field
The present invention relates to safeguard film for cellular phone production technical fields, specifically, being related to a kind of graphene coating process.
Background technique
Graphene is a kind of two dimensional crystal, and the common graphite of people is the planar carbon by being arranged from level to level with honeycomb-patterned ordered
Atom stack and formed, the interlaminar action power of graphite is weaker, it is easy to mutually removing, form very thin graphite flake.When stone
After ink sheet stripping is at single layer, the single layer of only one this carbon atom thickness is exactly graphene.The latest find of graphene is people
In terms of anticorrosion most efficient method, do protective film with graphene, can significantly delay corrosion of metal speed, and make it
Firmer antibody Monoclonal.Graphene is not only the nova of electronic industry, and the future applied to traditional industry is also limitless, answers
With direction: the fields such as marine anticorrosion, anti-corrosion of metal, heavy antisepsis.Graphene has good thermally conductive, electric conductivity, however utilizes
The Flexible graphene heat dissipation film of its development and production of graphene can help laptop, smart phone, LED display etc. significantly
Heat radiation performance.
As the improvement of people's living standards, smart phone more and more occurs in people's lives, and with intelligence
The development of energy mobile phone market, safeguard film for cellular phone just like become a huge industry.In safeguard film for cellular phone production procedure, need
Printing is coated using surface of the graphene to membrane material.In the prior art, graphene coating process that there are printing efficiencies is low,
The defects of Product Precision is poor, graphene waste is serious, Painting effect is undesirable.
Summary of the invention
The object of the present invention is to provide a kind of graphene coating process, to solve above-mentioned technical problem.
The present invention is achieved through the following technical solutions:
A kind of graphene coating process, it is characterised in that: the following steps are included:
1, graphene ink is prepared
1A, 50 parts of graphene, 30 parts of resin, 20 parts of the diluent medicinal cuppings for pouring into printing ink dispersion machine are taken;After fixing medicinal cupping,
Blender is opened, speed 200r/min is stirred 5 minutes;
1B, blender speed is increased to 500r/min, stirs 20 minutes, above-mentioned substance is sufficiently mixed;
1C, blender speed is slowly successively increased to 1000r/min, is stirred 10 minutes;
1D, the ink stirred evenly is taken out, i.e. graphene ink, being placed on temperature is 18 DEG C -23 DEG C, and divulges information, is dry
It is spare in dry, shady and cool environment;
2, printing is coated with graphene ink
2A, the membrane material for needing the web-like being coated with is suitble to the one side of coating upward;
2B, the membrane material of web-like is stretched, it is made to sequentially pass through corona treatment, rotary screen-printing machine, dryer;
2C, it will be coated with halftone and scraper loading rotary screen-printing machine, and will start rotary screen-printing machine, to its operating
After normal, pour into graphene ink made from step 1D in its print cartridge, and by adjust net away from, scraper pressure, squeegee angle,
Running speed adjusts printing effect, until coating quality meets the requirements;
2D, membrane material initially pass through corona treatment, and corona treatment carries out sided corona treatment to membrane material, improves its surface
Physical property improves the surface energy on its surface, so that the attachment and coating of its surface graphene ink preferably;
2E, membrane material by sided corona treatment pass through rotary screen-printing machine, and rotary screen-printing machine is by graphene
Ink coating and printing is on the surface of membrane material;
When 2F, the membrane material after the coating of graphene ink pass through dryer, dryer is to the stone being coated on membrane material
Black alkene ink carries out drying and processing, so that it is adhering completely to the surface of membrane material, finally obtains graphene coated product.
The utility model has the advantages that compared with prior art, graphene coating process of the present invention is no longer limited to traditional equipment
On, coating efficiency greatly improves, Painting effect more preferably, Product Precision it is high, and graphene can be greatlyd save, avoid wasting.
Specific embodiment
Below with reference to specific embodiment, the present invention is described further.
Embodiment:
Graphene coating process of the present invention, comprising the following steps:
1, graphene ink is prepared
1A, 50 parts of graphene, 30 parts of resin, 20 parts of the diluent medicinal cuppings for pouring into printing ink dispersion machine are taken;After fixing medicinal cupping,
Blender is opened, speed 200r/min is stirred 5 minutes.
1B, blender speed is increased to 500r/min, stirs 20 minutes, above-mentioned substance is sufficiently mixed.
1C, blender speed is slowly successively increased to 1000r/min, is stirred 10 minutes.
1D, the ink stirred evenly is taken out, i.e. graphene ink, being placed on temperature is 18 DEG C -23 DEG C, and divulges information, is dry
It is spare in dry, shady and cool environment.
2, printing is coated with graphene ink
2A, the membrane material for the web-like being coated with will be needed to be mounted on the material axis of safeguard film for cellular phone production equipment (circular knife machine),
Selection is suitble to the one side of coating upward.
2B, the membrane material of web-like is stretched, it is made to sequentially pass through corona treatment, rotary screen-printing machine, dryer,
And its other end is connected on the collecting shaft of safeguard film for cellular phone production equipment (circular knife machine);Start safeguard film for cellular phone production equipment
(circular knife machine) first makes its low-speed running, to guarantee that the membrane material on collecting shaft can neat rewinding.
2C, it will be coated with halftone and scraper loading rotary screen-printing machine, and will start rotary screen-printing machine, to its operating
After normal, pour into graphene ink made from step 1D in its print cartridge, and by adjust net away from, scraper pressure, squeegee angle,
The parameters such as running speed adjust printing effect, until coating quality meets the requirements.
After 2D, safeguard film for cellular phone production equipment run well, membrane material initially passes through corona treatment, and corona treatment is to film
Material carries out sided corona treatment, improves the physical property on its surface, the surface energy on its surface is improved, so that its surface graphite preferably
The attachment and coating of alkene ink.
Commercially available corona treatment (manufacturer: the limited public affairs of Jiangsu He Feng machine-building is used in technique of the present invention
Department, model: 270mm), principle is using high-frequency high voltage in processed membrane material surface corona (high-frequency ac
Voltage is up to 5000-15000V/m2) and low temperature plasma is generated, so that membrane material surface is generated radical reaction and is made to polymerize
Object crosslinks, and surface is roughening and increases its wetability to polar solvent, these low temperature plasmas are by shocking by electricity and permeating
It aoxidizes and polarizes by its molecular structure of the surface breakdown of print body, and then by processed surface molecular, ion electric shock corrodes
Surface, so that increasing the adhesive ability on membrane material surface.
2E, the membrane material by sided corona treatment pass through rotary screen-printing machine and (use commercially available rotary screen-printing
Machine, manufacturer: Shenzhen Wang Tian printing machinery factory, model: L254), graphene ink is coated with by rotary screen-printing machine to be printed
Brush is on the surface of membrane material.
2F, the membrane material after the coating of graphene ink pass through dryer and (use commercially available dryer, manufacturer: deep
Zhen Lingchuan precision machinery Co., Ltd, model: 40T) when, dryer dries the graphene ink being coated on membrane material
Processing, guarantees that the product printed is completely dried, it is made to be adhering completely to the surface of membrane material, finally obtains graphene coating and produces
Product.
The foregoing is only a preferred embodiment of the present invention, but scope of protection of the present invention is not limited thereto,
Anyone skilled in the art in the technical scope disclosed by the present invention, according to the technique and scheme of the present invention and its
Inventive concept is subject to equivalent substitution or change, should be covered by the protection scope of the present invention.
Claims (1)
1. a kind of graphene coating process, it is characterised in that: the following steps are included:
(1) graphene ink is prepared
(1A) takes 50 parts of graphene, 30 parts of resin, 20 parts of the diluent medicinal cuppings for pouring into printing ink dispersion machine;After fixing medicinal cupping, open
Blender is opened, speed 200r/min is stirred 5 minutes;
Blender speed is increased to 500r/min by (1B), stirs 20 minutes, above-mentioned substance is sufficiently mixed;
(1C) slowly successively increases blender speed to 1000r/min, stirs 10 minutes;
(1D) takes out the ink stirred evenly, i.e. graphene ink, and being placed on temperature is 18 DEG C -23 DEG C, and divulge information, is dry,
It is spare in shady and cool environment;
(2) printing is coated with graphene ink
The membrane material for needing the web-like being coated with is suitble to the one side of coating upward by (2A);
(2B) stretches the membrane material of web-like, it is made to sequentially pass through corona treatment, rotary screen-printing machine, dryer;
(2C) will be coated with halftone and scraper is packed into rotary screen-printing machine, starts rotary screen-printing machine, just to its operating
Chang Hou, pours into graphene ink made from step (1D) in its print cartridge, and by adjust net away from, scraper pressure, squeegee angle,
Running speed adjusts printing effect, until coating quality meets the requirements;
(2D) membrane material initially passes through corona treatment, and corona treatment carries out sided corona treatment to membrane material, improves the object on its surface
Rationality energy improves the surface energy on its surface, so that the attachment and coating of its surface graphene ink preferably;
The membrane material of (2E) Jing Guo sided corona treatment passes through rotary screen-printing machine, and rotary screen-printing machine is by graphene ink
Coating and printing is on the surface of membrane material;
When the membrane material of (2G) after the coating of graphene ink passes through dryer, dryer is to the graphene being coated on membrane material
Ink carries out drying and processing, so that it is adhering completely to the surface of membrane material, finally obtains graphene coated product.
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Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN111976267A (en) * | 2020-07-17 | 2020-11-24 | 山东华滋自动化技术股份有限公司 | Coating method based on double-sided coating and local selective coating of flexible circuit board |
CN115257208A (en) * | 2021-12-29 | 2022-11-01 | 山东华滋自动化技术股份有限公司 | Method and device for manufacturing low-temperature electrothermal film |
Citations (17)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN103013229A (en) * | 2012-12-30 | 2013-04-03 | 中国科学院宁波材料技术与工程研究所 | Graphene based conductive ink and preparation method thereof as well as flexible conductive thin film |
CN103113786A (en) * | 2013-03-07 | 2013-05-22 | 苏州牛剑新材料有限公司 | Graphene conductive ink and preparation method thereof |
CN103319954A (en) * | 2013-07-12 | 2013-09-25 | 珠海市乐通化工股份有限公司 | Conductive graphene printing ink and preparation method thereof |
CN103345963A (en) * | 2013-06-28 | 2013-10-09 | 重庆墨希科技有限公司 | Graphene composite transparent electrode and preparation method and application thereof |
CN104495821A (en) * | 2014-12-16 | 2015-04-08 | 重庆墨希科技有限公司 | Method and device for preparing single-layer continuous graphene film coiled material |
CN104693897A (en) * | 2015-02-28 | 2015-06-10 | 济宁利特纳米技术有限责任公司 | Conductive ink based on graphene composite material and preparation method thereof |
CN105111484A (en) * | 2015-08-28 | 2015-12-02 | 上海利物盛企业集团有限公司 | Method for efficiently and continuously preparing heat-conducting graphite film on large area |
CN205705571U (en) * | 2016-03-23 | 2016-11-23 | 常州烯材碳材料科技有限公司 | A kind of Graphene heat dissipation film |
CN107512041A (en) * | 2017-07-17 | 2017-12-26 | 青岛超碳新材料科技有限公司 | A kind of preparation method of copper foil graphene/carbon nano-tube or copper foil graphene/carbon nano-tube copper foil heat conduction film |
CN107686109A (en) * | 2017-07-17 | 2018-02-13 | 青岛超碳新材料科技有限公司 | A kind of preparation method of the double-deck carbon-based heat conduction film of high performance graphite graphene |
CN207108895U (en) * | 2017-08-04 | 2018-03-16 | 郴州国盛新材科技有限公司 | A kind of graphene composite material heat conducting film production system |
CN107833869A (en) * | 2017-10-23 | 2018-03-23 | 南京旭羽睿材料科技有限公司 | A kind of graphene heat conducting film and preparation method thereof |
CN108384034A (en) * | 2018-01-16 | 2018-08-10 | 湖南国盛石墨科技有限公司 | A kind of PET/ graphenes heat conducting film and preparation method thereof |
CN108419308A (en) * | 2018-05-14 | 2018-08-17 | 黑龙江大学 | A kind of radiator based on nanoscale graphite alkene |
CN208173609U (en) * | 2018-03-28 | 2018-11-30 | 江苏裕兴薄膜科技股份有限公司 | A kind of heat conduction and heat radiation film backboard |
CN109183395A (en) * | 2018-09-30 | 2019-01-11 | 河南工程学院 | A kind of preparation method of graphene oxide UV light curable conductive fabric |
CN109306209A (en) * | 2018-08-31 | 2019-02-05 | 江苏天创新材料科技有限公司 | A kind of preparation method of preparation method and cylinder the printing Electric radiant Heating Film of the black compound electro-thermal ink of graphene/carbon |
-
2019
- 2019-04-30 CN CN201910362266.3A patent/CN109968846A/en active Pending
Patent Citations (17)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN103013229A (en) * | 2012-12-30 | 2013-04-03 | 中国科学院宁波材料技术与工程研究所 | Graphene based conductive ink and preparation method thereof as well as flexible conductive thin film |
CN103113786A (en) * | 2013-03-07 | 2013-05-22 | 苏州牛剑新材料有限公司 | Graphene conductive ink and preparation method thereof |
CN103345963A (en) * | 2013-06-28 | 2013-10-09 | 重庆墨希科技有限公司 | Graphene composite transparent electrode and preparation method and application thereof |
CN103319954A (en) * | 2013-07-12 | 2013-09-25 | 珠海市乐通化工股份有限公司 | Conductive graphene printing ink and preparation method thereof |
CN104495821A (en) * | 2014-12-16 | 2015-04-08 | 重庆墨希科技有限公司 | Method and device for preparing single-layer continuous graphene film coiled material |
CN104693897A (en) * | 2015-02-28 | 2015-06-10 | 济宁利特纳米技术有限责任公司 | Conductive ink based on graphene composite material and preparation method thereof |
CN105111484A (en) * | 2015-08-28 | 2015-12-02 | 上海利物盛企业集团有限公司 | Method for efficiently and continuously preparing heat-conducting graphite film on large area |
CN205705571U (en) * | 2016-03-23 | 2016-11-23 | 常州烯材碳材料科技有限公司 | A kind of Graphene heat dissipation film |
CN107512041A (en) * | 2017-07-17 | 2017-12-26 | 青岛超碳新材料科技有限公司 | A kind of preparation method of copper foil graphene/carbon nano-tube or copper foil graphene/carbon nano-tube copper foil heat conduction film |
CN107686109A (en) * | 2017-07-17 | 2018-02-13 | 青岛超碳新材料科技有限公司 | A kind of preparation method of the double-deck carbon-based heat conduction film of high performance graphite graphene |
CN207108895U (en) * | 2017-08-04 | 2018-03-16 | 郴州国盛新材科技有限公司 | A kind of graphene composite material heat conducting film production system |
CN107833869A (en) * | 2017-10-23 | 2018-03-23 | 南京旭羽睿材料科技有限公司 | A kind of graphene heat conducting film and preparation method thereof |
CN108384034A (en) * | 2018-01-16 | 2018-08-10 | 湖南国盛石墨科技有限公司 | A kind of PET/ graphenes heat conducting film and preparation method thereof |
CN208173609U (en) * | 2018-03-28 | 2018-11-30 | 江苏裕兴薄膜科技股份有限公司 | A kind of heat conduction and heat radiation film backboard |
CN108419308A (en) * | 2018-05-14 | 2018-08-17 | 黑龙江大学 | A kind of radiator based on nanoscale graphite alkene |
CN109306209A (en) * | 2018-08-31 | 2019-02-05 | 江苏天创新材料科技有限公司 | A kind of preparation method of preparation method and cylinder the printing Electric radiant Heating Film of the black compound electro-thermal ink of graphene/carbon |
CN109183395A (en) * | 2018-09-30 | 2019-01-11 | 河南工程学院 | A kind of preparation method of graphene oxide UV light curable conductive fabric |
Non-Patent Citations (2)
Title |
---|
刘武辉: "《现代印刷材料》", 30 September 2007, 印刷工业出版社 * |
杨红: "《现代汉英英汉印刷油墨词典》", 31 October 2002, 印刷工业出版社 * |
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN111976267A (en) * | 2020-07-17 | 2020-11-24 | 山东华滋自动化技术股份有限公司 | Coating method based on double-sided coating and local selective coating of flexible circuit board |
CN115257208A (en) * | 2021-12-29 | 2022-11-01 | 山东华滋自动化技术股份有限公司 | Method and device for manufacturing low-temperature electrothermal film |
CN115257208B (en) * | 2021-12-29 | 2023-12-05 | 山东华滋自动化技术股份有限公司 | Manufacturing method and manufacturing device of low-temperature electrothermal film |
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