CN114561147A - Release film for graphite calendering and preparation method thereof - Google Patents
Release film for graphite calendering and preparation method thereof Download PDFInfo
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- CN114561147A CN114561147A CN202210249207.7A CN202210249207A CN114561147A CN 114561147 A CN114561147 A CN 114561147A CN 202210249207 A CN202210249207 A CN 202210249207A CN 114561147 A CN114561147 A CN 114561147A
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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
- C09D183/00—Coating compositions based on macromolecular compounds obtained by reactions forming in the main chain of the macromolecule a linkage containing silicon, with or without sulfur, nitrogen, oxygen, or carbon only; Coating compositions based on derivatives of such polymers
- C09D183/04—Polysiloxanes
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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
- 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
- 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
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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
- 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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- 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
- C08J2367/00—Characterised by the use of polyesters obtained by reactions forming a carboxylic ester link in the main chain; Derivatives of such polymers
- C08J2367/02—Polyesters derived from dicarboxylic acids and dihydroxy compounds
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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
- C08J2483/00—Characterised by the use of macromolecular compounds obtained by reactions forming in the main chain of the macromolecule a linkage containing silicon with or without sulfur, nitrogen, oxygen, or carbon only; Derivatives of such polymers
- C08J2483/04—Polysiloxanes
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L2205/00—Polymer mixtures characterised by other features
- C08L2205/02—Polymer mixtures characterised by other features containing two or more polymers of the same C08L -group
- C08L2205/025—Polymer mixtures characterised by other features containing two or more polymers of the same C08L -group containing two or more polymers of the same hierarchy C08L, and differing only in parameters such as density, comonomer content, molecular weight, structure
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Abstract
The invention relates to the technical field of release films, and discloses a release film for graphite calendering and a preparation method thereof, wherein the release film comprises a substrate layer and a release layer adhered to the surface of the substrate layer, and coating liquid of the release layer is prepared from the following components in parts by weight: after 15-25 parts of dimethyl silicone oil, 25-35 parts of peeling force regulator and 8-12 parts of methyl silicone resin are mixed, 45-55 parts of organic solvent is added to be fully stirred and dispersed, and finally 1-2 parts of hydrogen-containing silicone oil, 2-3 parts of adhesive and 2-2.5 parts of platinum catalytic assistant are added to be integrally mixed to obtain the composite. The release film has small thickness and good surface affinity with graphite flakes, the graphite flakes with different thicknesses can be pressed by the release film with one thickness, the cost is low, the release film has proper micro-adhesion to the graphite flakes, and the graphite flakes cannot be damaged when the release film is torn from the graphite flakes.
Description
Technical Field
The invention relates to the technical field of release films, in particular to a release film for graphite calendering and a preparation method thereof.
Background
With the acceleration of the industrialization process, the electronic product can conduct heat quickly in the direction of requiring quick heat dissipation and quick electric conduction, which becomes the hard requirement of the electronic product. In recent years, in the field of electronics, due to the development of integration technology and assembly technology, the volume of electronic components has been reduced by tens of thousands of times, and thus, there is a demand for a material having a small volume and high thermal conductivity. Especially in the development of modern mobile communication and 5G base stations, the requirements for ultra-high heat conduction and electric conduction of electronic products and materials are increasingly strengthened. Thus, some product suppliers in the upstream are continuously developing and seeking new materials to meet the needs of customers. In the field of electronic auxiliary materials, the requirements for auxiliary materials are also becoming quite fine. In practice, graphite sheets are made by high temperature firing PI film materials because PI materials require high temperature firing during carbonization. During high temperature, the PI film will have some irregular foaming, making the surface rough. In order to achieve the purpose of use, the process treatment of calendering and thickening of the graphite flake is needed, a release film product with a viscous force structure is needed in the process treatment, and the release film needs to be effectively pressed along with a supported object due to the process requirement, so that the surface of the artificially fired graphite flake becomes more smooth and uniform in thickness. Then follow the graphite flake from the type membrane and enter into the customer end, cut into different shapes according to different customers' demand again, when using, just can use the graphite flake after with tearing off the type membrane.
The adhesive force between the release film applied to the graphite flake and the surface of the graphite flake in the current market is higher or lower, the larger adhesive force can cause the breakage of the graphite flake when the release film is torn off from the graphite flake, the smaller adhesive force can not adhere the graphite flake, the powder falling phenomenon can occur, the problems of non-uniform materials and the like can also occur in the use of a client, the stock is easily increased, the residue of the graphite is easily caused after the use, and the peel gram weight is high; secondly, the affinity between the release film and the surface of the graphite flake in the current market is poor, so that the release film with one thickness can only be suitable for pressing the graphite flake with one thickness, and the thickness of the release layer on the release film is about 2-3 μm, so that the cost is high.
Disclosure of Invention
The purpose of the invention is as follows: aiming at the problems in the prior art, the invention provides the release film for graphite calendering and the preparation method thereof, the release film has smaller thickness and better surface affinity with graphite flakes, the release film with one thickness can press the graphite flakes with different thicknesses, the cost is low, the release film has proper micro-adhesion to the graphite flakes, and the graphite flakes cannot be damaged when the release film is torn off from the graphite flakes.
The technical scheme is as follows: the invention provides a release film for graphite calendering, which comprises a substrate layer and a release layer on the surface of the substrate layer, wherein coating liquid of the release layer is prepared from the following components in parts by weight: after 15-25 parts of dimethyl silicone oil, 25-35 parts of peeling force regulator and 8-12 parts of methyl silicone resin are mixed, 45-55 parts of organic solvent is added to be fully stirred and dispersed, and finally 1-2 parts of hydrogen-containing silicone oil, 3-4 parts of adhesion promoter and 2-2.5 parts of platinum catalytic promoter are added to be integrally mixed to obtain the composite.
Preferably, the organic solvent is 120 mineral spirits.
The invention also provides a preparation method of the release film for graphite calendering, which comprises the following steps: coating the coating liquid of the release layer on the surface of the base material layer which is subjected to corona treatment and has a dyne value of more than 42 through a mesh roller, and transferring the coating liquid of the release layer to the surface of the base material layer through meshes of the mesh roller so as to form the release layer with the meshes; when the grids of the mesh roller are transferred to the surface of the base material layer, the angle of the scraper is 40-43 degrees, and the air pressure of the rubber roller (6) is set to be 3.0-4.0 Pa; the coating weight is 0.6-0.8 g/m2(ii) a The baking temperatures of the six sections of baking ovens during coating are respectively as follows: 65-75 ℃, 95-105℃,115-125 ℃, 135-145 ℃, 115-125 ℃, 90-105 ℃, and the conveying speed of the base material is 45-55 m/min during coating; the total coating baking time is 40-50 s.
Preferably, the thickness of the substrate is 50um to 100 um.
Preferably, the thickness of the release layer is less than 1 μm.
Preferably, the mesh size of the mesh roll is 150 mesh.
Preferably, the substrate is a PET film.
Has the advantages that: graphite calendering in this application uses PET as the substrate with releasing the type membrane, carries out surface corona treatment to the substrate after, makes its surface dyne value be greater than 42, then passes through the special coating structure that has little viscous force of precision coating machine coating one deck on its surface as from the type layer. Through adding methyl silicone resin of different proportions in the component, can be so that surface energy and the adhesive force on release layer and graphite flake surface in this release mould obtain adjusting, because methyl silicone resin can take place affinity cross-linking with the silicon oil molecule in the component, make coating surface hardness change, can adjust the hardness of hardness on release layer surface, at the in-process to graphite suppression, release layer surface has fine affinity with the graphite flake, and like this, this release layer just can be applicable to the graphite flake of suppression different thickness, reach the multi-purpose of a material, it is effectual to suppress, and work efficiency is improved. In addition, because the product itself adopts the technology of high temperature fast curing, takes place the reaction in the time of the utmost point short, should have little adhesion to the graphite flake from the type layer, uses the graphite flake to tear off the type membrane from the graphite flake when the customer, owing to only have little adhesion to the graphite flake from the type layer, can not lead to the graphite flake damaged or fall phenomenons such as whitewashed, guarantees the effective use of product.
The thickness of the release layer can be controlled below 1 mu m through the adjustment of the formula, the thickness of the release film is reduced by half compared with the existing release layer with the thickness of 2-3 mu m, the dry silicon amount of 2 grams per square meter is originally required, and through the adjustment of the formula, the dry silicon amount of 1 gram per square meter of the release film can meet the use requirement of a client. The release gram weight is increased from the previous 500-700 g to 700-1000 g, but the weight is lighter after the calendering than before. Graphite from 17um to 60um can be pressed. The release film has low surface micro-adhesive force, good affinity, strong universality and stable peeling force; one-step forming and simple process.
Drawings
Fig. 1 is a schematic view of a coating process of a release film for graphite calendering in the present application;
fig. 2 is a schematic view of a calendered release film having a graphite sheet on the surface thereof.
Detailed Description
The present invention will be described in detail with reference to the accompanying drawings.
The source and type of raw materials used in the following specific embodiments are as follows:
dimethyl silicone oil: dow corporation, model 7326;
peeling force adjuster: dow corporation, model 7210;
methyl silicone resin: dow corporation, model 7458;
no. 120 solvent oil: a soluble organic solvent oil;
hydrogen-containing silicone oil: dow corporation, model 7028;
an adhesion aid: dow corporation, type 297;
platinum catalyst promoter: dow company, model 4000.
Embodiment 1:
the embodiment provides a release film for graphite calendering, which comprises a substrate layer and a release layer adhered to the surface of the substrate layer, wherein the coating liquid of the release layer is prepared from the following components in parts by weight: 20 parts of dimethyl silicone oil, 30 parts of peeling force regulator and 10 parts of methyl silicone resin are mixed, 50 parts of No. 120 solvent oil is added to be fully stirred and dispersed, and finally 3 parts of cross-linking auxiliary agent of the silicone oil, 2 parts of adhesion auxiliary agent and 2 parts of platinum catalytic auxiliary agent are added to be integrally mixed to obtain the composite.
The method for preparing the release film for graphite calendering by using the coating solution of the release layer is as follows, as shown in figure 1:
coating the coating liquid 1 of the release layer on the surface of a PET substrate layer 3 which is subjected to corona treatment and has a dyne value of more than 42 through a 150-mesh screen roller 2, transferring the coating liquid 1 of the release layer to the surface of the substrate layer 3 through meshes of the screen roller 2, and enabling the thickness of the substrate layer 3 to be 80 microns; a release layer 4 having a thickness of 0.8 μm with a mesh was formed.
When the grids of the mesh roller 2 are transferred to the surface of the substrate layer 3, the angle of the scraper 5 is 40-43 degrees, and the air pressure of the rubber roller 6 is set at 3.5 PA;
the baking temperatures of the six sections of baking ovens during coating are respectively as follows: the substrate transfer speed at the time of coating was 50m/min at 70 ℃, 100 ℃, 120 ℃, 140 ℃, 120 ℃ and 100 ℃; the total coating time was 50 s.
Embodiment 2:
this embodiment is substantially the same as embodiment 1, except that in this embodiment, the methyl silicone resin is 8 parts in the coating solution formulation of the release layer of the release film for graphite calendering. Otherwise, this embodiment is identical to embodiment 1, and will not be described herein.
Embodiment 3:
this embodiment is substantially the same as embodiment 1, except that 12 parts of methyl silicone resin is used in the coating solution formulation of the release layer of the release film for graphite calendering in this embodiment. Otherwise, this embodiment is identical to embodiment 1, and will not be described herein.
Comparative example:
this embodiment is substantially the same as embodiment 1, except that the coating solution formulation of the release layer of the release film for graphite calendering does not contain a methyl silicone resin in this embodiment. Otherwise, this embodiment is identical to embodiment 1, and will not be described herein.
The release films for calendering graphite prepared in the above embodiments and comparative examples were used in a process of calendering graphite sheets having thicknesses of 17 μm, 25 μm and 40 μm, respectively, and then the release grams of the graphite calendered release film products obtained after calendering were tested, and the test results are shown in the following table 1:
TABLE 1
As can be seen from Table 1, the addition of the resins in different proportions makes the graphite production process significantly different, and it is possible through experimentation that the data obtained from the proportions of example 1 are most idealized. The strength of surface peeling and the gloss of the surface are significantly different.
The above embodiments are merely illustrative of the technical concepts and features of the present invention, and the purpose of the embodiments is to enable those skilled in the art to understand the contents of the present invention and implement the present invention, and not to limit the protection scope of the present invention. All equivalent changes and modifications made according to the spirit of the present invention should be covered within the protection scope of the present invention.
Claims (7)
1. The release film for graphite calendering comprises a base material layer and a release layer adhered to the surface of the base material layer, and is characterized in that coating liquid of the release layer is prepared from the following components in parts by weight: after 15-25 parts of dimethyl silicone oil, 25-35 parts of peeling force regulator and 8-12 parts of methyl silicone resin are mixed, 45-55 parts of organic solvent is added to be fully stirred and dispersed, and finally 1-2 parts of hydrogen-containing silicone oil, 2-3 parts of adhesive and 2-2.5 parts of platinum catalytic assistant are added to be integrally mixed to obtain the composite.
2. The release film for graphite calendering according to claim 1, wherein the organic solvent is 120 # solvent oil.
3. A preparation method of a release film for graphite calendering is characterized by comprising the following steps:
coating the coating liquid (1) of the release layer of claim 1 or 2 on the surface of the base material layer (3) which is subjected to corona treatment and has a dyne value of more than 42 through a mesh roller (2), wherein the coating liquid (1) of the release layer is transferred to the surface of the base material layer (3) through meshes of the mesh roller (2), so that a release layer (4) with meshes is formed;
when the grids of the mesh roller (2) are transferred to the surface of the substrate layer (3), the angle of the scraper (5) is 40-43 degrees, and the air pressure of the rubber roller (6) is set to be 3.0-4.0 Pa; the coating weight is 0.6-0.8 g/m2 ；
The baking temperatures of the six sections of baking ovens during coating are respectively as follows: 65-75 ℃, 95-105 ℃, 115-125 ℃, 135-145 ℃, 115-125 ℃, 95-105 ℃, and the conveying speed of the substrate (3) is 45-55 m/min during coating; the total coating baking time is 40-50 s.
4. The method for preparing the release film for graphite calendering according to claim 3, wherein the thickness of the base material layer (3) is 50um to 100 um.
5. The method for producing the release film for graphite calendering according to claim 3, wherein the thickness of the release layer (4) is less than 1 μm.
6. The method for producing a release film for graphite calendering according to claim 3, wherein the mesh size of the mesh roll is 150 mesh.
7. The method for producing the release film for graphite calendering according to any one of claims 3 to 6, wherein the base material layer (3) is a PET film.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210249207.7A CN114561147A (en) | 2022-03-14 | 2022-03-14 | Release film for graphite calendering and preparation method thereof |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202210249207.7A CN114561147A (en) | 2022-03-14 | 2022-03-14 | Release film for graphite calendering and preparation method thereof |
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| CN114561147A true CN114561147A (en) | 2022-05-31 |
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| CN202210249207.7A Pending CN114561147A (en) | 2022-03-14 | 2022-03-14 | Release film for graphite calendering and preparation method thereof |
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Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105637042A (en) * | 2013-09-30 | 2016-06-01 | 可隆工业株式会社 | Release film and manufacturing method therefor |
| WO2020009401A1 (en) * | 2018-07-04 | 2020-01-09 | 도레이첨단소재 주식회사 | Reusable release film |
| JP2021172083A (en) * | 2020-04-21 | 2021-11-01 | トーレ・アドバンスド・マテリアルズ・コリア・インコーポレーテッドToray Advanced Materials Korea Incorporated | Release film and manufacturing method of the release film |
| WO2022045785A1 (en) * | 2020-08-31 | 2022-03-03 | 주식회사 엘지화학 | Silicone-based coating composition and silicone-based release film comprising same |
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2022
- 2022-03-14 CN CN202210249207.7A patent/CN114561147A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105637042A (en) * | 2013-09-30 | 2016-06-01 | 可隆工业株式会社 | Release film and manufacturing method therefor |
| WO2020009401A1 (en) * | 2018-07-04 | 2020-01-09 | 도레이첨단소재 주식회사 | Reusable release film |
| JP2021172083A (en) * | 2020-04-21 | 2021-11-01 | トーレ・アドバンスド・マテリアルズ・コリア・インコーポレーテッドToray Advanced Materials Korea Incorporated | Release film and manufacturing method of the release film |
| WO2022045785A1 (en) * | 2020-08-31 | 2022-03-03 | 주식회사 엘지화학 | Silicone-based coating composition and silicone-based release film comprising same |
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