CN106304783A - Heat conductivity both-sided adhesive graphite flake - Google Patents

Heat conductivity both-sided adhesive graphite flake Download PDF

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Publication number
CN106304783A
CN106304783A CN201610705947.1A CN201610705947A CN106304783A CN 106304783 A CN106304783 A CN 106304783A CN 201610705947 A CN201610705947 A CN 201610705947A CN 106304783 A CN106304783 A CN 106304783A
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CN
China
Prior art keywords
graphite
parts
sided adhesive
pet film
heat conductivity
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Granted
Application number
CN201610705947.1A
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Chinese (zh)
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CN106304783B (en
Inventor
金闯
梁豪
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Sidike New Materials Jiangsu Co Ltd
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Sidike New Materials Jiangsu Co Ltd
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Priority to CN201610705947.1A priority Critical patent/CN106304783B/en
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Publication of CN106304783B publication Critical patent/CN106304783B/en
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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
    • C08J7/00—Chemical treatment or coating of shaped articles made of macromolecular substances
    • C08J7/04—Coating
    • C08J7/0427—Coating with only one layer of a composition containing a polymer binder
    • 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
    • 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
    • H05K7/205—Heat-dissipating body thermally connected to heat generating element via thermal paths through printed circuit board [PCB]
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B37/00—Methods or apparatus for laminating, e.g. by curing or by ultrasonic bonding
    • B32B37/12—Methods or apparatus for laminating, e.g. by curing or by ultrasonic bonding characterised by using adhesives
    • B32B37/1207—Heat-activated adhesive
    • B—PERFORMING OPERATIONS; TRANSPORTING
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    • B32B27/00—Layered products comprising a layer of synthetic resin
    • B32B27/28—Layered products comprising a layer of synthetic resin comprising synthetic resins not wholly covered by any one of the sub-groups B32B27/30 - B32B27/42
    • B32B27/281—Layered products comprising a layer of synthetic resin comprising synthetic resins not wholly covered by any one of the sub-groups B32B27/30 - B32B27/42 comprising polyimides
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    • 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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    • C04B35/524—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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    • C09J2467/00—Presence of polyester
    • C09J2467/005—Presence of polyester in the release coating

Abstract

The open a kind of heat conductivity both-sided adhesive graphite flake of the present invention, described heat conductivity both-sided adhesive graphite flake fits between radiating piece and heat generating components, described heat conductivity both-sided adhesive graphite flake includes light strippable PET film and weight strippable PET film, is disposed with the first heat-conducting glue adhesion coating, graphite linings and the second heat-conducting glue adhesion coating between this light strippable PET film and weight strippable PET film；Described graphite linings is coated with the Kapton after one layer of graphite modified dose of acquisition processes on the upper and lower surface of Kapton, and graphite modified dose is made up of the component of following weight portion: benzophenone tetracarboxylic dianhydride 22 parts, pyromellitic acid anhydride 15.6 parts, MDA 26 parts, dimethylformamide 32 parts, ethylene glycol 1.8 parts, polydimethylsiloxane 2.2 parts.The present invention uses calender to roll the carbonized film of described pre-burned, it is to avoid the volume contraction in fold and graphitization sintering process.

Description

Heat conductivity both-sided adhesive graphite flake
Technical field
The present invention relates to a kind of heat conductivity both-sided adhesive graphite flake, belong to double faced adhesive chip technology field.
Background technology
Along with modern microelectronic technology high-speed develops, electronic equipment (such as notebook computer, mobile phone, panel computer etc.) is day by day Becoming ultra-thin, light, this structure makes electronic equipment internal power density significantly improve, and in operation, produced heat is difficult to Discharge, be prone to accumulate rapidly and form high temperature.On the other hand, high temperature can reduce the performance of electronic equipment, reliability and use longevity Life.Therefore, Current electronic industry is for proposing the highest requirement as the heat sink material of 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 properly functioning.
In prior art, Kapton is mostly used for flexible PCB, although has and uses polyimide film sintered obtaining Obtain graphite heat radiation fin, thus be covered on thermal source, but be constrained to the good and the bad of the product quality and performances of Kapton not Together, have influence on the performance of heat radiation two-sided pad pasting heat dispersion, there is techniques below problem: dispel the heat uneven, adhesive tape easily occurs Hot-spot, the heat dispersion that improve product is unstable, reliability performance is poor, is unfavorable for product quality management control, affects product Competitiveness.
Summary of the invention
It is an object of the present invention to provide a kind of heat conductivity both-sided adhesive graphite flake, this heat conductivity both-sided adhesive graphite flake is vertically Direction and horizontal direction all improve heat conductivility, it is to avoid adhesive tape hot-spot, it is achieved that the uniformity of adhesive tape heat conductivility Meanwhile, improve the heat dispersion stability of product, reliability, greatly reduce the cost of product.
For reaching above-mentioned purpose, the technical solution used in the present invention is: a kind of heat conductivity both-sided adhesive graphite flake, described in lead Hot both-sided adhesive graphite flake fits between radiating piece and heat generating components, and described heat conductivity both-sided adhesive graphite flake includes gently shelling Release PET film and weight strippable PET film, be disposed with the first heat conduction between this light strippable PET film and weight strippable PET film Adhesive layer, graphite linings and the second heat-conducting glue adhesion coating；Described graphite linings is obtained by following process, this process include with Lower step:
Step one, Kapton is risen to 250 DEG C from room temperature, after rising to 400 DEG C after insulation, be down to room temperature；
Step 2, it is coated with one layer of graphite modified dose of acquisition on the upper and lower surface of the Kapton through step one and processes After Kapton, the viscosity of described graphite modified dose is 30000 ~ 48000CP；
Described graphite modified dose is made up of the component of following weight portion: benzophenone tetracarboxylic dianhydride 22 parts, pyromellitic acid anhydride 15.6 parts, MDA 26 parts, dimethylformamide 32 parts, ethylene glycol 1.8 parts, polydimethylsiloxane 2.2 parts；
Step 3, will process after Kapton be warming up to 800 DEG C, be warming up to 1200 DEG C after insulation, after insulation cool down, Thus obtain the carbonized film of pre-burned；
Step 4, employing calender roll the carbonized film of the pre-burned of described step 4；
Step 5, it is warming up to 2400 DEG C, after insulation, is warming up to 2900 DEG C again, cool down after insulation, thus obtain the main graphite fired Film；
Step 6, the graphite film that then master of step 5 gained fires carry out rolling thus obtain described graphite linings (6).
In technique scheme, further improved plan is as follows:
In such scheme, described step 4 acquisition graphite film is carried out calendering process.
In such scheme, the grammes per square metre of described light strippable PET film peeling force is 5 ~ 10g/m2。
In such scheme, the grammes per square metre of described heavy strippable PET film peeling force is 50 ~ 100g/m2。
Owing to technique scheme is used, the present invention compared with prior art has following advantages and an effect:
Heat conductivity both-sided adhesive graphite flake of the present invention, in its structure, graphite linings is coated with one layer graphite modified dose by upper and lower surface Kapton be prepared from, improve at heat conductivility both vertically and horizontally, it is to avoid adhesive tape hot-spot, Achieve the uniformity of adhesive tape heat conductivility；Secondly, it is positioned at graphite modified dose of Kapton surface by benzophenone Tetracarboxylic dianhydride, pyromellitic acid anhydride, MDA, dimethylformamide, ethylene glycol, polydimethylsiloxane group Become, be coated on Kapton, the pin hole being filled with in heating process, improve degree of crystallinity simultaneously, also overcome heat receipts Contract excessive cause uneven, improve graphite linings biaxial tension performance；Again, Kapton surface has graphite modified Agent, improves graphite linings and heat-conducting glue adhesion coating heat conductivility in two-sided pad pasting, and uses calender to roll the carbon of described pre-burned Change film, it is to avoid the volume contraction in fold and graphitization sintering process, improve compactness and degree of crystallinity, further increase At heat conductivility both vertically and horizontally.
Accompanying drawing explanation
Accompanying drawing 1 is heat conductivity both-sided adhesive graphite flake structural representation of the present invention；
Accompanying drawing 2 is heat conductivity both-sided adhesive graphite flake application schematic diagram of the present invention；
Accompanying drawing 3 is the partial structurtes schematic diagram of accompanying drawing 1.
In the figures above: 1, radiating piece；2, heat generating components；3, light strippable PET film；4, weight strippable PET film；5, first Heat-conducting glue adhesion coating；6, graphite linings；7, the second heat-conducting glue adhesion coating.
Detailed description of the invention
Below in conjunction with embodiment, the invention will be further described:
Embodiment: a kind of heat conductivity both-sided adhesive graphite flake, described heat conductivity both-sided adhesive graphite flake fits in radiating piece 1 and sends out Between thermal part 2, described heat conductivity both-sided adhesive graphite flake includes light strippable PET film 3 and weight strippable PET film 4, and this gently shells The first heat-conducting glue adhesion coating 5, graphite linings 6 and the second heat conduction it is disposed with gluing between release PET film 3 and weight strippable PET film 4 Layer 7；Described graphite linings 6 is obtained by following process, and this process comprises the following steps:
Step one, Kapton is risen to 250 DEG C with 4 ~ 6 degree/min speed from room temperature, keep 0.9 ~ 1.1 hour, then With 2.5 ~ 3.5 degree/min, rise to 400 DEG C, after keeping 1 hour, be down to room temperature；
Step 2, it is coated with one layer of graphite modified dose of acquisition on the upper and lower surface of the Kapton through step one and processes After Kapton, described graphite modified dose is made up of the component of following weight portion, as shown in table 1:
Table 1
Embodiment
Benzophenone tetracarboxylic dianhydride 22
Pyromellitic acid anhydride 15.6
MDA 26
Dimethylformamide 32
Ethylene glycol 1.8
Polydimethylsiloxane 2.2
The viscosity of graphite modified dose of embodiment is 42000CP；
Step 3, rise to 800 DEG C with the speed of 4 ~ 6 degree/min, keep 0.9 ~ 1.1 hour；Again with the speed liter of 9 ~ 11 degree/min To 1200 DEG C, cool down after preserving 0.9 ~ 1.1 hour, thus obtain the carbonized film of pre-burned；
Step 4, employing calender roll the carbonized film of the pre-burned of described step 4；
Step 5, rise to 2400 DEG C with the speed of 19 ~ 21 degree/min, keep 0.9 ~ 1.1 hour, then the speed with 19 ~ 21 degree/min Degree rises to 2900 DEG C, cools down after keeping 1.8 ~ 2.2 hours, thus obtains the main graphite film fired；
Step 6, the graphite film that then master of step 5 gained fires carry out rolling thus obtain described graphite linings (6).
Described step 6 acquisition graphite linings is carried out calendering process.
The grammes per square metre of above-mentioned light strippable PET film 1 peeling force is 5 ~ 10g/m2, described heavy strippable PET film 2 peeling force gram It is heavily 50 ~ 100g/m2。
When using above-mentioned heat conductivity both-sided adhesive graphite flake, in its structure, graphite linings is coated with one layer of stone by upper and lower surface The Kapton of ink modifying agent is prepared from, and improves at heat conductivility both vertically and horizontally, it is to avoid adhesive tape Hot-spot, it is achieved that the uniformity of adhesive tape heat conductivility；Secondly, its be positioned at graphite modified dose of Kapton surface by Benzophenone tetracarboxylic dianhydride, pyromellitic acid anhydride, MDA, dimethylformamide, ethylene glycol, poly dimethyl silicon Oxygen alkane forms, and is coated on Kapton, the pin hole being filled with in heating process, improves degree of crystallinity simultaneously, also overcomes Thermal contraction is excessive cause uneven, improve graphite linings biaxial tension performance；Again, Kapton surface has stone Ink modifying agent, improves graphite linings and heat-conducting glue adhesion coating heat conductivility in two-sided pad pasting, and uses calender to roll described pre-burning The carbonized film of system, it is to avoid the volume contraction in fold and graphitization sintering process, improves compactness and degree of crystallinity, further Improve at heat conductivility both vertically and horizontally.
Above-described embodiment, only for technology design and the feature of the explanation present invention, its object is to allow person skilled in the art Scholar will appreciate that present disclosure and implements according to this, can not limit the scope of the invention with this.All according to the present invention The equivalence that spirit is made changes or modifies, and all should contain within protection scope of the present invention.

Claims (4)

1. a heat conductivity both-sided adhesive graphite flake, described heat conductivity both-sided adhesive graphite flake fits in radiating piece (1) and heating Between parts (2), described heat conductivity both-sided adhesive graphite flake includes light strippable PET film (3) and weight strippable PET film (4), this Be disposed with between light strippable PET film (3) and heavily strippable PET film (4) the first heat-conducting glue adhesion coating (5), graphite linings (6) and Second heat-conducting glue adhesion coating (7)；It is characterized in that: described graphite linings (6) is obtained by following process, and this process includes Following steps:
Step one, Kapton is risen to 250 DEG C from room temperature, after rising to 400 DEG C after insulation, be down to room temperature；
Step 2, it is coated with one layer of graphite modified dose of acquisition on the upper and lower surface of the Kapton through step one and processes After Kapton, the viscosity of described graphite modified dose is 30000 ~ 48000CP；
Described graphite modified dose is made up of the component of following weight portion: benzophenone tetracarboxylic dianhydride 22 parts, pyromellitic acid anhydride 15.6 parts, MDA 26 parts, dimethylformamide 32 parts, ethylene glycol 1.8 parts, polydimethylsiloxane 2.2 parts；
Step 3, will process after Kapton be warming up to 800 DEG C, be warming up to 1200 DEG C after insulation, after insulation cool down, Thus obtain the carbonized film of pre-burned；
Step 4, employing calender roll the carbonized film of the pre-burned of described step 4；
Step 5, it is warming up to 2400 DEG C, after insulation, is warming up to 2900 DEG C again, cool down after insulation, thus obtain the main graphite fired Film；
Step 6, the graphite film that then master of step 5 gained fires carry out rolling thus obtain described graphite linings (6).
Heat conductivity both-sided adhesive graphite flake the most according to claim 1, it is characterised in that: described step 4 is obtained graphite Layer (6) carries out calendering process.
Heat conductivity both-sided adhesive graphite flake the most according to claim 1, it is characterised in that: described light strippable PET film (1) The grammes per square metre of peeling force is 5 ~ 10g/m2。
Heat conductivity both-sided adhesive graphite flake the most according to claim 1, it is characterised in that: described heavy strippable PET film (2) The grammes per square metre of peeling force is 50 ~ 100g/m2。
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CN201610794749.7A Pending CN106398570A (en) 2014-01-26 2014-01-26 High-compactness graphite soaking adhesive tape
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