CN107043256A - Manufacturing process for the paster that radiates - Google Patents
Manufacturing process for the paster that radiates Download PDFInfo
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- CN107043256A CN107043256A CN201710095544.4A CN201710095544A CN107043256A CN 107043256 A CN107043256 A CN 107043256A CN 201710095544 A CN201710095544 A CN 201710095544A CN 107043256 A CN107043256 A CN 107043256A
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- kapton
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- 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
- C09D179/00—Coating compositions based on macromolecular compounds obtained by reactions forming in the main chain of the macromolecule a linkage containing nitrogen, with or without oxygen, or carbon only, not provided for in groups C09D161/00 - C09D177/00
- C09D179/04—Polycondensates having nitrogen-containing heterocyclic rings in the main chain; Polyhydrazides; Polyamide acids or similar polyimide precursors
- C09D179/08—Polyimides; Polyester-imides; Polyamide-imides; Polyamide acids or similar polyimide precursors
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B28—WORKING CEMENT, CLAY, OR STONE
- B28B—SHAPING CLAY OR OTHER CERAMIC COMPOSITIONS; SHAPING SLAG; SHAPING MIXTURES CONTAINING CEMENTITIOUS MATERIAL, e.g. PLASTER
- B28B3/00—Producing shaped articles from the material by using presses; Presses specially adapted therefor
- B28B3/12—Producing shaped articles from the material by using presses; Presses specially adapted therefor wherein one or more rollers exert pressure on the material
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- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
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- C04B35/00—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products
- C04B35/515—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products based on non-oxide ceramics
- C04B35/52—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products based on non-oxide ceramics based on carbon, e.g. graphite
- C04B35/522—Graphite
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- C04B35/00—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products
- C04B35/515—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products based on non-oxide ceramics
- C04B35/52—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products based on non-oxide ceramics based on carbon, e.g. graphite
- C04B35/524—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products based on non-oxide ceramics based on carbon, e.g. graphite obtained from polymer precursors, e.g. glass-like carbon material
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- C04B35/00—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products
- C04B35/622—Forming processes; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products
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- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B35/00—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products
- C04B35/622—Forming processes; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products
- C04B35/62218—Forming processes; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products obtaining ceramic films, e.g. by using temporary supports
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08G—MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
- C08G73/00—Macromolecular compounds obtained by reactions forming a linkage containing nitrogen with or without oxygen or carbon in the main chain of the macromolecule, not provided for in groups C08G12/00 - C08G71/00
- C08G73/06—Polycondensates having nitrogen-containing heterocyclic rings in the main chain of the macromolecule
- C08G73/10—Polyimides; Polyester-imides; Polyamide-imides; Polyamide acids or similar polyimide precursors
- C08G73/1067—Wholly aromatic polyimides, i.e. having both tetracarboxylic and diamino moieties aromatically bound
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- 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
- C09D7/00—Features of coating compositions, not provided for in group C09D5/00; Processes for incorporating ingredients in coating compositions
- C09D7/40—Additives
- C09D7/65—Additives macromolecular
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F1/00—Details not covered by groups G06F3/00 - G06F13/00 and G06F21/00
- G06F1/16—Constructional details or arrangements
- G06F1/20—Cooling means
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F1/00—Details not covered by groups G06F3/00 - G06F13/00 and G06F21/00
- G06F1/16—Constructional details or arrangements
- G06F1/20—Cooling means
- G06F1/203—Cooling means for portable computers, e.g. for laptops
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- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05K—PRINTED CIRCUITS; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS
- H05K7/00—Constructional details common to different types of electric apparatus
- H05K7/20—Modifications to facilitate cooling, ventilating, or heating
- H05K7/2039—Modifications to facilitate cooling, ventilating, or heating characterised by the heat transfer by conduction from the heat generating element to a dissipating body
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- C04B2235/00—Aspects relating to ceramic starting mixtures or sintered ceramic products
- C04B2235/02—Composition of constituents of the starting material or of secondary phases of the final product
- C04B2235/30—Constituents and secondary phases not being of a fibrous nature
- C04B2235/48—Organic compounds becoming part of a ceramic after heat treatment, e.g. carbonising phenol resins
- C04B2235/483—Si-containing organic compounds, e.g. silicone resins, (poly)silanes, (poly)siloxanes or (poly)silazanes
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Abstract
A kind of manufacturing process for the paster that radiates of the present invention, comprises the following steps acquisition:Be respectively coated on the upper and lower surface of Kapton graphite modified dose handled after Kapton, the Kapton after processing is made up of Kapton, the first coat and the second coat;By the Kapton after processing under inert gas shielding, 240 DEG C ~ 260 DEG C are risen to from room temperature, 480 DEG C ~ 500 DEG C are risen to after insulation, 780 DEG C ~ 820 DEG C are warming up to after insulation again, rises to after 1200 DEG C and cools down after insulation, so as to obtain the carbonized film of pre-burned;Carbonized film is warming up to 2350 DEG C ~ 2450 DEG C, is incubated, then is warming up to cooling after 2850 DEG C ~ 2950 DEG C, so as to obtain the graphite film of main firing.The present invention is improved in heat conductivility both vertically and horizontally, realize the uniformity of adhesive tape heat conductivility, it is to avoid the volume contraction in fold and graphitization sintering process, improves compactness and crystallinity.
Description
Technical field
The present invention relates to a kind of manufacturing process for the paster that radiates, belong to graphite flake technical field.
Background technology
As modern microelectronic technology high-speed develops, electronic equipment(Such as notebook computer, mobile phone, tablet personal computer)Increasingly
Become ultra-thin, light, this structure causes electronic equipment internal power density to significantly improve, the heat produced by operation is difficult
Discharge, be easy to rapid accumulation and form high temperature.On the other hand, high temperature can reduce the performance of electronic equipment, reliability and use the longevity
Life.Therefore, Current electronic industry proposes higher and higher requirement for the heat sink material as heat control system core component, urgently
Need a kind of high-efficiency heat conduction, light material to transfer heat away from rapidly, ensure that electronic equipment is normally run.
Kapton is mostly used for flexible PCB in the prior art, although has and is obtained using polyimide film sintered
Graphite heat radiation fin, so as to be covered on thermal source, but be constrained to Kapton product quality and performances the good and the bad not
Together, the performance of the two-sided pad pasting heat dispersion of radiating has been had influence on, there is following technical problem:Radiating is uneven, adhesive tape easily occurs
Hot-spot, the heat dispersion that improves product is unstable, reliability performance is poor, is unfavorable for product quality management control, influences product
Competitiveness.
The content of the invention
Objects of the present invention are to provide a kind of manufacturing process for the paster that radiates, the radiating patch that the manufacturing process is obtained
Piece is both vertically and horizontally improving heat conductivility, it is to avoid hot-spot, realizes the uniformity of heat conductivility
Meanwhile, heat dispersion stability, the reliability of product are improved, the cost of product is greatly reduced.
To achieve the above object of the invention, the technical solution adopted by the present invention is:A kind of manufacturing process for the paster that radiates,
It is characterized in that:The graphite heat radiation fin is obtained by following steps:
Step 1: be respectively coated on the upper and lower surface of Kapton graphite modified dose handled after polyimides it is thin
Film, the Kapton after processing is made up of Kapton, the first coat and the second coat;
The graphite modified dose of component by following parts by weight is constituted:
24 parts of benzophenone tetracarboxylic dianhydride,
18 parts of pyromellitic acid anhydride,
25 parts of MDA,
24 parts of dimethylformamide,
9.5 parts of 1-METHYLPYRROLIDONE,
1.8 parts of ethylene glycol,
2 parts of dimethyl silicone polymer,
1 part of dibutyl phthalate;
Step 2: by the Kapton after processing under inert gas shielding, 240 DEG C ~ 260 DEG C, insulation are risen to from room temperature
After rise to 480 DEG C ~ 500 DEG C, 780 DEG C ~ 820 DEG C are warming up to after insulation again, risen to after insulation after 1200 DEG C cool down, so as to obtain pre-
The carbonized film of firing;
Step 3: carbonized film is warming up into 2350 DEG C ~ 2450 DEG C, it is incubated, then is warming up to cooling after 2850 DEG C ~ 2950 DEG C, so that
Obtain the graphite film of main firing;
Step 4: then the graphite film of the main firing obtained by step 3 is carried out calendering to obtain the heat conduction graphite patch.
Because above-mentioned technical proposal is used, the present invention has following advantages and effect compared with prior art:
1st, the present invention is used to graphite linings in the manufacturing process of paster of radiating, its structure and is coated with one layer of graphite by upper and lower surface changing
Property agent Kapton be prepared from, improve in heat conductivility both vertically and horizontally, it is to avoid adhesive tape is local
Overheat, realizes the uniformity of adhesive tape heat conductivility;Next, it is located at graphite modified dose of Kapton surface by hexichol
Ketone tetracarboxylic dianhydride, pyromellitic acid anhydride, MDA, dimethylformamide, ethylene glycol, dimethyl silicone polymer
Composition, is coated on Kapton, is filled with the pin hole in heating process, improve crystallinity simultaneously, also overcome heat
Shrink excessive caused uneven, improve graphite linings biaxial tension performance.
2nd, manufacturing process of the present invention for the paster that radiates, it is located at graphite modified dose of Kapton surface by two
Benzophenone tetracarboxylic dianhydride, pyromellitic acid anhydride, MDA, dimethylformamide, 1-METHYLPYRROLIDONE, second two
Alcohol, dimethyl silicone polymer composition, reduce azeotropic point and smooth boiling using dimethylformamide, 1-METHYLPYRROLIDONE
Point area, improves the flatness and pliability of final products film forming;;Secondly, dimethylformamide, 1-METHYLPYRROLIDONE and neighbour
Dibatyl phithalate Kapton surface, prevents bubble from producing, and is more beneficial for the tiny needle of filled polyimide film
Hole, improves the uniformity of radiating paster heat conductivility.
3rd, manufacturing process of the present invention for the paster that radiates, the increase calendering step between the carbonized film and graphitization of pre-burned
Suddenly, and re-form and roll again after heat conduction graphite patch, it is to avoid the volume contraction in fold and graphitization sintering process, carry
High compactness and crystallinity, are further increased in heat conductivility both vertically and horizontally.
Embodiment
With reference to embodiment, the invention will be further described:
Embodiment:A kind of manufacturing process for the paster that radiates, the graphite heat radiation fin is obtained by following steps:
Step 1: be respectively coated on the upper and lower surface of Kapton graphite modified dose handled after polyimides it is thin
Film, the Kapton after processing is made up of Kapton, the first coat and the second coat;
The graphite modified dose of component by following parts by weight is constituted:
24 parts of benzophenone tetracarboxylic dianhydride,
18 parts of pyromellitic acid anhydride,
25 parts of MDA,
24 parts of dimethylformamide,
9.5 parts of 1-METHYLPYRROLIDONE,
1.8 parts of ethylene glycol,
2 parts of dimethyl silicone polymer,
1 part of dibutyl phthalate;
Step 2: by the Kapton after processing under inert gas shielding, 240 DEG C ~ 260 DEG C, insulation are risen to from room temperature
After rise to 480 DEG C ~ 500 DEG C, 780 DEG C ~ 820 DEG C are warming up to after insulation again, risen to after insulation after 1200 DEG C cool down, so as to obtain pre-
The carbonized film of firing;
Step 3: carbonized film is warming up into 2350 DEG C ~ 2450 DEG C, it is incubated, then is warming up to cooling after 2850 DEG C ~ 2950 DEG C, so that
Obtain the graphite film of main firing;
Step 4: then the graphite film of the main firing obtained by step 3 is carried out calendering to obtain the heat conduction graphite patch.
Above-mentioned graphite modified dose of viscosity is 30000 ~ 48000CP.
A kind of manufacturing process of above-mentioned graphite heat radiation fin, comprises the following steps:
Step 1: be respectively coated on the upper and lower surface of Kapton graphite modified dose handled after polyimides it is thin
Film, the Kapton after processing is made up of Kapton, the first coat and the second coat, described graphite modified
The viscosity of agent is 30000 ~ 48000CP;
The graphite modified dose of component by following parts by weight is constituted:
24 parts of benzophenone tetracarboxylic dianhydride,
18 parts of pyromellitic acid anhydride,
25 parts of MDA,
24 parts of dimethylformamide,
9.5 parts of 1-METHYLPYRROLIDONE,
1.8 parts of ethylene glycol,
2 parts of dimethyl silicone polymer,
1 part of dibutyl phthalate;
Step 2: by the Kapton after processing under inert gas shielding, 240 DEG C ~ 260 DEG C, insulation are risen to from room temperature
After rise to 480 DEG C ~ 500 DEG C, 780 DEG C ~ 820 DEG C are warming up to after insulation again, risen to after insulation after 1200 DEG C cool down, so as to obtain pre-
The carbonized film of firing;
Step 3: carbonized film is warming up into 2350 DEG C ~ 2450 DEG C, it is incubated, then is warming up to cooling after 2850 DEG C ~ 2950 DEG C, so that
Obtain the graphite film of main firing;
Step 4: then the graphite film of the main firing obtained by step 3 is carried out calendering to obtain the heat conduction graphite patch.
During using above-mentioned manufacturing process, obtain and be coated with for graphite linings in graphite heat radiation fin its structure by upper and lower surface
One layer graphite modified dose of Kapton is prepared from, and is improved in heat conductivility both vertically and horizontally, is kept away
Exempt from adhesive tape hot-spot, realize the uniformity of adhesive tape heat conductivility;Secondly, its graphite for being located at Kapton surface changes
Property agent is by benzophenone tetracarboxylic dianhydride, pyromellitic acid anhydride, MDA, dimethylformamide, ethylene glycol, poly- two
Methylsiloxane is constituted, and is coated on Kapton, is filled with the pin hole in heating process, improves crystallinity simultaneously,
Also overcome thermal contraction excessive caused uneven, improve graphite linings biaxial tension performance, also reduce azeotropic point and put down
Sliding boiling point area, improves the flatness and pliability of final products film forming;Again, there is graphite to change on Kapton surface
Property agent, improve graphite linings and heat conduction adhesive layer heat conductivility in two-sided pad pasting, and the pre-burned is rolled using calender
Carbonized film, it is to avoid the volume contraction in fold and graphitization sintering process, improves compactness and crystallinity, further improves
In heat conductivility both vertically and horizontally.
The above embodiments merely illustrate the technical concept and features of the present invention, and its object is to allow person skilled in the art
Scholar can understand present disclosure and implement according to this, and it is not intended to limit the scope of the present invention.It is all according to the present invention
The equivalent change or modification that Spirit Essence is made, should all be included within the scope of the present invention.
Claims (1)
1. a kind of manufacturing process for the paster that radiates, it is characterised in that:The radiating paster is obtained by following steps:
Step 1: be respectively coated on the upper and lower surface of Kapton graphite modified dose handled after polyimides it is thin
Film, the Kapton after processing is made up of Kapton, the first coat and the second coat;
The graphite modified dose of component by following parts by weight is constituted:
24 parts of benzophenone tetracarboxylic dianhydride,
18 parts of pyromellitic acid anhydride,
25 parts of MDA,
24 parts of dimethylformamide,
9.5 parts of 1-METHYLPYRROLIDONE,
1.8 parts of ethylene glycol,
2 parts of dimethyl silicone polymer,
1 part of dibutyl phthalate;
Step 2: by the Kapton after processing under inert gas shielding, 240 DEG C ~ 260 DEG C, insulation are risen to from room temperature
After rise to 480 DEG C ~ 500 DEG C, 780 DEG C ~ 820 DEG C are warming up to after insulation again, risen to after insulation after 1200 DEG C cool down, so as to obtain pre-
The carbonized film of firing;
Step 3: carbonized film is warming up into 2350 DEG C ~ 2450 DEG C, it is incubated, then is warming up to cooling after 2850 DEG C ~ 2950 DEG C, so that
Obtain the graphite film of main firing;
Step 4: then the graphite film of the main firing obtained by step 3 is carried out calendering to obtain the heat conduction graphite patch.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
CN201710095544.4A CN107043256A (en) | 2014-01-26 | 2014-01-26 | Manufacturing process for the paster that radiates |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
CN201710095544.4A CN107043256A (en) | 2014-01-26 | 2014-01-26 | Manufacturing process for the paster that radiates |
CN201410036320.2A CN104812204B (en) | 2014-01-26 | 2014-01-26 | Manufacturing process for graphite heat radiation fin |
Related Parent Applications (1)
Application Number | Title | Priority Date | Filing Date |
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CN201410036320.2A Division CN104812204B (en) | 2014-01-26 | 2014-01-26 | Manufacturing process for graphite heat radiation fin |
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CN107043256A true CN107043256A (en) | 2017-08-15 |
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Family Applications (11)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
CN201710665173.9A Pending CN107573072A (en) | 2014-01-26 | 2014-01-26 | The production method of high compactness fin |
CN201710095545.9A Pending CN107043257A (en) | 2014-01-26 | 2014-01-26 | Manufacture method for the fin of computer radiator |
CN201710665184.7A Pending CN108218428A (en) | 2014-01-26 | 2014-01-26 | For the manufacturing method of tablet computer soaking patch |
CN201710095581.5A Pending CN107043258A (en) | 2014-01-26 | 2014-01-26 | The manufacture method of notebook computer fin |
CN201710095543.XA Active CN107043108B (en) | 2014-01-26 | 2014-01-26 | Cooling fin manufacturing process for smart phone |
CN201710095544.4A Pending CN107043256A (en) | 2014-01-26 | 2014-01-26 | Manufacturing process for the paster that radiates |
CN201410036320.2A Active CN104812204B (en) | 2014-01-26 | 2014-01-26 | Manufacturing process for graphite heat radiation fin |
CN201710665185.1A Pending CN108206164A (en) | 2014-01-26 | 2014-01-26 | For the cooling fin of microelectronics heat dissipation |
CN201710665183.2A Pending CN107986789A (en) | 2014-01-26 | 2014-01-26 | Smart mobile phone heat dissipation film |
CN201710665192.1A Pending CN108646885A (en) | 2014-01-26 | 2014-01-26 | Cooling fin for laptop |
CN201710095575.XA Pending CN107043255A (en) | 2014-01-26 | 2014-01-26 | The manufacturing process of fin |
Family Applications Before (5)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
CN201710665173.9A Pending CN107573072A (en) | 2014-01-26 | 2014-01-26 | The production method of high compactness fin |
CN201710095545.9A Pending CN107043257A (en) | 2014-01-26 | 2014-01-26 | Manufacture method for the fin of computer radiator |
CN201710665184.7A Pending CN108218428A (en) | 2014-01-26 | 2014-01-26 | For the manufacturing method of tablet computer soaking patch |
CN201710095581.5A Pending CN107043258A (en) | 2014-01-26 | 2014-01-26 | The manufacture method of notebook computer fin |
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CN201710665185.1A Pending CN108206164A (en) | 2014-01-26 | 2014-01-26 | For the cooling fin of microelectronics heat dissipation |
CN201710665183.2A Pending CN107986789A (en) | 2014-01-26 | 2014-01-26 | Smart mobile phone heat dissipation film |
CN201710665192.1A Pending CN108646885A (en) | 2014-01-26 | 2014-01-26 | Cooling fin for laptop |
CN201710095575.XA Pending CN107043255A (en) | 2014-01-26 | 2014-01-26 | The manufacturing process of fin |
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CN107551392A (en) * | 2017-08-29 | 2018-01-09 | 成都三乙医疗科技有限公司 | A kind of thermal conducting piece for thermotherapy |
WO2022198661A1 (en) * | 2021-03-26 | 2022-09-29 | 浙江华熔科技有限公司 | Ultrathin thermally-conductive graphite film and manufacturing method therefor |
CN114714687B (en) * | 2022-03-30 | 2023-09-29 | 安徽碳华新材料科技有限公司 | Preparation method of graphite heat dissipation film without halogen residues |
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CN107986789A (en) | 2018-05-04 |
CN107043255A (en) | 2017-08-15 |
CN108646885A (en) | 2018-10-12 |
CN107043108B (en) | 2019-04-23 |
CN107573072A (en) | 2018-01-12 |
CN107043257A (en) | 2017-08-15 |
CN104812204B (en) | 2017-08-25 |
CN108206164A (en) | 2018-06-26 |
CN108218428A (en) | 2018-06-29 |
CN107043258A (en) | 2017-08-15 |
CN104812204A (en) | 2015-07-29 |
CN107043108A (en) | 2017-08-15 |
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