Low-temperature curing and high-adhesion PET release film for electronic products and preparation method thereof

Abstract

The application belongs to the technical field of release film, and specifically provides a low-temperature curing and high-adhesion PET release film for electronic products and a preparation method thereof, S1: gasoline, butanone, isopropyl alcohol and cyclohexanone are mixed as a solvent, and a silicone release agent, an anchoring agent, a crosslinking agent, a heavy release agent and a catalyst are added into the mixed solvent; after the mixture is obtained by stirring, filtration is performed through a filter core, and the mixture needs to be used within 3 hours; S2: a film is selected as a base material, and the base material film is subjected to corona treatment; S3: a micro-concave coating technology is adopted; S4: the temperature of an oven in the oven is sequentially set as 80-90 DEG C, 107-113 DEG C, 107-128 DEG C, 107-113 DEG C and 80-90 DEG C; the total air volume in the oven is 28000 m 3 / h; and S5: receiving and winding the material. The above can be cured at a lower temperature, while ensuring high requirements for the appearance of the release film.

Description

Technical Field

[0001] This invention relates to the field of release film technology, and in particular to a low-temperature curing, high-adhesion PET release film for electronic products and its preparation method. Background Technology

[0002] PET release film, a functional film coated with a release agent, is widely used due to its high mechanical strength, dimensional stability, good temperature resistance, and good chemical and environmental tolerance, especially in high-precision electronic products. In the die-cutting industry, highly transparent PET release film is combined with various types of silicone for various stages of electronic assembly, where the PET release film plays a process protection role.

[0003] With the advent of the 5G era, electronic products are being updated and iterated at a rapid pace, and product performance requirements are becoming increasingly diversified, placing higher demands on related industries such as die-cutting. The requirements for PET release films used in die-cutting are also becoming more stringent. Release films must be easy to peel while maintaining a certain level of adhesion, and simultaneously ensure a smooth and defect-free product appearance. The release agent coating and curing process on the PET release film surface requires heating to cross-link with the PET film surface. Under the influence of equipment tension, excessively high curing temperatures can cause various surface defects such as rainbow patterns, vertical lines, and wrinkles. Conversely, excessively low temperatures can affect solvent evaporation, leading to poor silicone curing and impacting peel strength. Summary of the Invention

[0004] To address the aforementioned shortcomings, this invention provides a low-temperature curing, high-adhesion PET release film for electronic products and its preparation method, which can achieve curing at a lower temperature and ensure the high requirements for the appearance of the release film.

[0005] To achieve the above objectives, the present invention provides the following technical solution: a low-temperature curing, high-adhesion PET release film for electronic products, comprising, by weight percentage: 2%-6% silicone release agent, 1%-4% heavy-duty release agent, 0.05%-2% crosslinking agent, 0.01%-1% anchoring agent, 0.05%-1% catalyst, 20%-60% gasoline, 20%-60% methyl ethyl ketone (MEK), 1%-10% isopropanol, and 1%-10% cyclohexanone; wherein the gasoline comprises, by weight percentage: 10%-30% 120# gasoline and 10%-30% 180# gasoline.

[0006] The organosilicon release agent is specifically a vinyl-containing polysiloxane, the heavy-release agent is specifically a polyorganosiloxane resin solution, the crosslinking agent is specifically a hydrogen-containing silicone oil, the anchoring agent is specifically an epoxy-based siloxane, and the catalyst is specifically a platinum complex catalyst.

[0007] A method for preparing low-temperature curing, high-adhesion PET release film for electronic products includes the following steps:

[0008] S1: Mix gasoline, methyl ethyl ketone, isopropanol, and cyclohexanone as a solvent. Add silicone release agent, anchoring agent, crosslinking agent, heavy peeling agent, and catalyst to the mixed solvent. After stirring to obtain the mixture, filter it through a 0.2µm filter element. It must be used within 3 hours.

[0009] S2: Select a thin film as the substrate, perform corona treatment on the substrate film, and ensure that the corona value is greater than 50 during the corona treatment, and that the difference between any two points does not exceed 5.

[0010] S3: Using microgravure coating technology, the wet coating weight per square meter is 0.2g-0.25g;

[0011] S4: Set the oven temperature sequentially to 80℃-90℃, 107℃-113℃, 107℃-128℃, 107℃-113℃, and 80℃-90℃; the total air volume inside the oven is 28000m³. 3 / h;

[0012] S5: Reeling and winding: The tension during winding is 13N, and the taper is 20-40%.

[0013] As a further improvement of the present invention, the stirring speed in S1 is 1000 revolutions per minute and the stirring time is 30 minutes.

[0014] As a further improvement of the present invention, the S3 micro-groove coating technology specifically uses a screen roller with a mesh count of 200, a wet silicon content of 4-5g, a coating speed of 40M / min, and a speed ratio controlled between 1.1 and 1.2.

[0015] As a further improvement of the present invention, in step S5, there is no bonding roller during material receiving and winding, and the pressure of the traction roller is set to M: 0.10 MPa / G: 0.10 MPa.

[0016] The beneficial effects of this invention are:

[0017] 1. 120# gasoline has a distillation range of 80℃-169℃ and a moderate evaporation rate. Its slow evaporation allows the release agent time to flow and spread after application, avoiding surface defects caused by rapid drying. This effectively improves the leveling effect of the release agent, resulting in a smooth, uniform coating free of orange peel and pinholes. Meanwhile, 180# gasoline has a faster evaporation rate and a narrower distillation range of 80℃-120℃. It evaporates quickly after application, improving drying efficiency and reducing the risk of solvent residue. On high-speed production lines, this fast-drying solvent ensures timely evaporation, preventing poor curing due to incomplete evaporation.

[0018] 2. The leveling effect of 120# gasoline and the rapid drying of 180# gasoline together ensure a uniform coating, free of orange peel and pinholes, meeting the high requirements of electronic products for the appearance of the release film. Simultaneously, the combination of fast and slow evaporation of gasoline ensures efficient solvent evaporation at low temperatures, allowing the crosslinking agent to react fully. This allows production to be carried out at lower oven temperatures, avoiding surface defects such as rainbow patterns, vertical lines, and wrinkles caused by high temperatures.

[0019] 3. The heavy-duty release agent alters the surface properties of the release film coating, increasing surface energy and strengthening the interaction forces during film adhesion. Simultaneously, the heavy-duty release agent participates in adjusting the formation of a two-dimensional network structure, making the release film more viscous and providing greater resistance during peeling. Cyclohexanone ensures the stability and uniform coating of the release agent solution, enabling the silicone release agent to form a two-dimensional network structure with controllable cross-linking on the PET film surface, further optimizing the peel force and achieving a balance between peel force and adhesion. Attached Figure Description

[0020] Figure 1 This is a schematic diagram illustrating the mechanism of action of the present invention;

[0021] Figure 2 This is the infrared spectrum of the present invention. Detailed Implementation

[0022] To make the objectives, technical solutions, and advantages of this invention clearer, the invention will be further described in detail below with reference to embodiments. It should be understood that the specific embodiments described herein are merely illustrative and not intended to limit the invention.

[0023] This invention provides a low-temperature curing, high-adhesion PET release film for electronic products, comprising the following components by weight percentage: 2%-6% silicone release agent (RC7508), 1%-4% heavy peeling agent (RCA5), 0.05%-2% crosslinking agent (XL150), 0.01%-1% anchoring agent (AA9176), 0.05%-1% catalyst (SCAT-F50050), 20%-60% gasoline, 20%-60% methyl ethyl ketone (MEK), 1%-10% isopropanol, and 1%-10% cyclohexanone.

[0024] Gasoline, by weight percentage, comprises 10%-30% 120# gasoline and 10%-30% 180# gasoline.

[0025] The heavy-duty release agent (RCA5) is specifically a polyorganosiloxane resin solution, the crosslinking agent (XL150) is specifically a hydrogen-containing silicone oil, the anchoring agent (AA9176) is specifically an epoxy-based siloxane, the catalyst (SCAT-F50050) is specifically a platinum complex catalyst, and the organosilicon release agent (RC7508) is specifically a vinyl-containing polysiloxane.

[0026] As a further explanation of this embodiment, 120# gasoline has a moderate evaporation rate, improving the leveling effect of the release agent and forming a smooth, uniform coating without orange peel or pinholes. Its distillation range is typically 80℃-169℃, requiring a longer drying tunnel or higher temperature after coating for complete evaporation. 180# gasoline, with a distillation range typically between 80℃ and 120℃, evaporates rapidly after coating, resulting in high drying efficiency, more thorough evaporation, and extremely low residue risk. PET film is dense and non-porous, allowing solvents to evaporate only from the surface. On high-speed production lines, fast-drying solvents like 180# solvent gasoline must be added to ensure timely evaporation.

[0027] As a further explanation of this embodiment, the ratio of silicone release agent, crosslinking agent, anchoring agent, and heavy peeling agent controls the degree of crosslinking of the two-dimensional network structure formed by the addition reaction of silicon hydrogen bonds and double bonds on the PET film surface. The number of flexible units and the peeling force of the adhesive surface are controlled by controlling the mass fraction of the added peeling agent.

[0028] As a further explanation of this embodiment, the peel force of ordinary release films may be too low. Adding a heavy release agent can change the properties of the release film coating surface, increase the surface energy, and make the interaction force stronger when the release film is adhered. At the same time, the heavy release agent participates in adjusting the formation of a two-dimensional network structure, making the release film more viscous and providing greater resistance during peeling.

[0029] like Figure 1 As shown, Figure 1 The mechanism of action of silicone release agents on films involves cross-linking of silicone resin and cross-linking agents under the action of a catalyst. Van der Waals forces, hydrogen bonds, or molecular entanglement create interactions between the adhesive and the film, forming a peel force. The addition of anchoring agents and release agents further controls the peel force between the substrate and the film, thereby forming a two-dimensional network structure.

[0030] As a further explanation of this embodiment, cyclohexanone is a highly polar solvent with excellent solubility for silicone resins. It effectively prevents resin precipitation, ensuring the diluted release agent solution remains clear and stable, which significantly improves the residual adhesion rate of the release film. However, cyclohexanone is much more expensive than petroleum hydrocarbon solvents, and its addition is primarily for performance enhancement, not as a primary diluent.

[0031] This invention provides a method for preparing a low-temperature curing, high-adhesion PET release film for electronic products, comprising the following steps:

[0032] S1: Mix gasoline, methyl ethyl ketone, isopropanol, and cyclohexanone as a solvent. Add silicone release agent, anchoring agent, crosslinking agent, heavy peeling agent, and catalyst to the mixed solvent. Stir at 1000 rpm for 30 minutes. After stirring to obtain the mixture, filter it through a 0.2µm filter element. It must be used within 3 hours.

[0033] S2: Select domestic Hengli film as the substrate, and perform corona treatment on the substrate film. During the corona treatment, the corona value is greater than 50, and the difference between any two points is guaranteed to be no more than 5.

[0034] S3: Employs microgravure coating technology, using a 200 mesh screen roller with a wet silicon content of 4-5g, a coating speed of 40m / min, and a speed ratio controlled between 1.1 and 1.2. The wet coating amount per square meter is 0.2g-0.25g.

[0035] S4: Set the oven temperature sequentially to 80℃-90℃, 107℃-113℃, 107℃-128℃, 107℃-113℃, and 80℃-90℃; the total air volume inside the oven is 28000m³. 3 / h.

[0036] S5: Receiving and winding: The tension during winding is 13N, the taper is 20-40%, there is no bonding roller, and the traction roller pressure is M: 0.10MPa / G: 0.10 MPa.

[0037] like Figure 2 As shown, Figure 2 The infrared spectrum shows characteristic peaks of the carbon long chain of gasoline-based diluents (722), 1711 (C=O) of methyl ethyl ketone (MEK) and isopropyl ketone (IOP) diluents (3428(OH) & 1120(CO)), 1017 (Si-O-Si) of organosiloxanes, 1243 (Si-CH3) & 792 (Si-C) of groups formed by cross-linking of organosilanes with various substances, and stretching and bending vibration peaks of CH bonds at 2950~2850 & 1470.

[0038] Example 1

[0039] S1: Mix 10 parts of 120# gasoline, 10 parts of 180# gasoline, 20 parts of methyl ethyl ketone, 1 part of isopropanol, and 1 part of cyclohexanone as a solvent. Add 2 parts of silicone release agent, 1 part of heavy peeling agent, 0.05 parts of crosslinking agent, 0.01 parts of anchoring agent, and 0.05 parts of catalyst to the mixed solvent. Stir at 1000 rpm for 30 minutes. After stirring to obtain the mixture, filter it through a 0.2 μm filter element. It must be used within 3 hours.

[0040] S2: Select a thin film as the substrate and perform corona treatment on the substrate film. During the corona treatment, the corona value is greater than 50, and the difference between any two points is guaranteed to be no more than 5.

[0041] S3: Microgravure coating technology is adopted. The microgravure coating uses a 200 mesh screen roller, a wet silicon weight of 4g, a coating speed of 40m / min, and a speed ratio controlled between 1.1 and 1.2. The resulting wet coating weight per square meter is 0.2g-0.25g.

[0042] S4: Set the oven temperature sequentially to 80℃, 107℃, 107℃, 107℃, and 80℃; the total air volume inside the oven is 28000 m³ / h. 3 / h.

[0043] S5: Receiving and winding: The tension during winding is 13N, the taper is 20%, there is no bonding roller, and the traction roller pressure is M: 0.10MPa / G: 0.10 MPa.

[0044] Example 2

[0045] S1: Mix 20 parts of 120# gasoline, 20 parts of 180# gasoline, 40 parts of methyl ethyl ketone, 5 parts of isopropanol, and 5 parts of cyclohexanone as a solvent. Add 4 parts of silicone release agent, 2.5 parts of heavy peeling agent, 1.1 parts of crosslinking agent, 0.5 parts of anchoring agent, and 0.5 parts of catalyst to the mixed solvent. Stir at 1000 rpm for 30 minutes. After obtaining the mixture, filter it through a 0.2 μm filter element. It must be used within 3 hours.

[0046] S2: Select a thin film as the substrate and perform corona treatment on the substrate film. During the corona treatment, the corona value is greater than 50, and the difference between any two points is guaranteed to be no more than 5.

[0047] S3: Microgravure coating technology is adopted. The microgravure coating uses a screen roller with a mesh count of 200, a wet silicon weight of 4.5g, a coating speed of 40M / min, and a speed ratio controlled between 1.1 and 1.2. The resulting wet coating weight per square meter is 0.2g-0.25g.

[0048] S4: Set the oven temperature sequentially to 85℃, 110℃, 118℃, 110℃, and 85℃; the total air volume inside the oven is 28000 m³ / h. 3 / h.

[0049] S5: Receiving and winding: The tension during winding is 13N, the taper is 30%, there is no bonding roller, and the traction roller pressure is M: 0.10MPa / G: 0.10MPa.

[0050] Example 3

[0051] S1: Mix 30 parts of 120# gasoline, 30 parts of 180# gasoline, 60 parts of methyl ethyl ketone, 10 parts of isopropanol, and 10 parts of cyclohexanone as a solvent. Add 6 parts of silicone release agent, 4 parts of heavy peeling agent, 2 parts of crosslinking agent, 1 part of anchoring agent, and 1 part of catalyst to the mixed solvent. Stir at 1000 rpm for 30 minutes. After stirring to obtain the mixture, filter it through a 0.2 μm filter element. It must be used within 3 hours.

[0052] S2: Select a thin film as the substrate and perform corona treatment on the substrate film. During the corona treatment, the corona value is greater than 50, and the difference between any two points is guaranteed to be no more than 5.

[0053] S3: Employs microgravure coating technology, using a 200 mesh screen roller with a wet silicone amount of 5g, a coating speed of 40m / min, and a speed ratio controlled between 1.1 and 1.2. The wet coating amount per square meter is 0.2g-0.25g.

[0054] S4: Set the oven temperature sequentially to 90℃, 113℃, 128℃, 113℃, and 90℃; the total air volume inside the oven is 28000m³. 3 / h.

[0055] S5: Receiving and winding: The tension during winding is 13N, the taper is 40%, there is no bonding roller, and the traction roller pressure is M: 0.10MPa / G: 0.10 MPa.

[0056] Comparative Example 1

[0057] The preparation process for this comparative example is the same as that for Example 2, except that 10 parts of 120# gasoline in S1 are replaced with an equal amount of 180# gasoline.

[0058] Comparative Example 2

[0059] The preparation process for this comparative example is the same as that for Example 2, except that 10 parts of 180# gasoline in S1 are replaced with an equal amount of 120# gasoline.

[0060] Comparative Example 3

[0061] The preparation process for this comparative example is the same as that in Example 2, except that 5 parts of cyclohexanone in S1 are replaced with an equal amount of isopropanol.

[0062] The peel strength of the release films prepared in each embodiment and comparative example was tested using ASTM D3359, and the residual adhesion rate was tested using FINAT FTM 11. The results are shown in the table below.

[0063]

[0064] As shown in the table above, the introduction of gasoline and cyclohexanone ensures high adhesion and stable, relatively strong peel strength even at low-temperature curing. The lower curing temperature significantly reduces energy consumption compared to traditional processes and avoids damage to the base film caused by high temperatures, thus improving production safety and product yield.

[0065] The above are merely preferred embodiments of the present invention. The scope of protection of the present invention is not limited to the above-described embodiments. All technical solutions falling within the scope of the present invention's concept are within the scope of protection of the present invention. It should be noted that for those skilled in the art, any improvements and modifications made without departing from the principles of the present invention should also be considered within the scope of protection of the present invention.

Claims

1. A low-temperature curing, high-adhesion PET release film for electronic products, characterized in that, The mixture comprises, by weight percentage, 2%-6% silicone release agent, 1%-4% heavy peeling agent, 0.05%-2% crosslinking agent, 0.01%-1% anchoring agent, 0.05%-1% catalyst, 20%-60% gasoline, 20%-60% methyl ethyl ketone (MEK), 1%-10% isopropanol, and 1%-10% cyclohexanone. The gasoline comprises, by weight percentage, 10%-30% 120# gasoline and 10%-30% 180# gasoline. The organosilicon release agent is specifically a vinyl-containing polysiloxane, the heavy-release agent is specifically a polyorganosiloxane resin solution, the crosslinking agent is specifically a hydrogen-containing silicone oil, the anchoring agent is specifically an epoxy-based siloxane, and the catalyst is specifically a platinum complex catalyst.

2. The method for preparing a low-temperature curing, high-adhesion PET release film for electronic products according to claim 1, characterized in that, Includes the following steps: S1: Mix gasoline, methyl ethyl ketone, isopropanol, and cyclohexanone as a solvent. Add silicone release agent, anchoring agent, crosslinking agent, heavy peeling agent, and catalyst to the mixed solvent. After stirring to obtain the mixture, filter it through a 0.2µm filter element. It must be used within 3 hours. S2: Select a thin film as the substrate and perform corona treatment on the substrate film. During the corona treatment, the corona value is greater than 50, and the difference between any two points is not more than 5. S3: Using microgravure coating technology, the wet coating weight per square meter is 0.2g-0.25g; S4: Set the oven temperature sequentially to 80℃-90℃, 107℃-113℃, 107℃-128℃, 107℃-113℃, and 80℃-90℃; the total air volume inside the oven is 28000m³. 3 / h; S5: Reeling and winding: The tension during winding is 13N, and the taper is 20-40%.

3. The method for preparing a low-temperature curing, high-adhesion PET release film for electronic products according to claim 2, characterized in that, The stirring speed in S1 is 1000 revolutions per minute, and the stirring time is 30 minutes.

4. The method for preparing a low-temperature curing, high-adhesion PET release film for electronic products according to claim 2, characterized in that, The S3 micro-gravure coating technology specifically uses a screen roller with a mesh count of 200, a wet silicon content of 4-5g, a coating speed of 40M / min, and a speed ratio controlled between 1.1 and 1.

2.

5. The method for preparing a low-temperature curing, high-adhesion PET release film for electronic products according to claim 2, characterized in that, In S5, there is no bonding roller during material receiving and winding, and the traction roller pressure is set to M: 0.10 MPa / G: 0.10 MPa.

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