Method for producing a release material with built-in cushioning, release material

Abstract

The application provides a preparation method of a release material with self-buffering, comprising the following steps: step one, using corona to perform corona treatment on the surface of a PET raw material; step two, mixing LDPE, LLDPE and HDPE according to a mass ratio of 1:1:1-4:1:1, heating and bridging at 250-280 DEG C, and performing film coating on the double sides of the pretreated raw material, wherein the film head temperature is 280-310 DEG C, and the single side or the double sides of the film coating layer are compressed by using a cooling roller to obtain a PET film coating material with protrusions; and step three, coating an organic silicon release agent with a solid content of 100% on one side or both sides of the PET film coating material, and drying at 80-130 DEG C, and aging at 50 DEG C for 2 days to obtain a final product. The application also relates to a release material. The prepared release material not only has certain buffering performance, but also has release performance, and has a wide application prospect in the field of electronic packaging.

Description

Technical Field

[0001] This invention relates to the field of release materials, and more particularly to a method for preparing a release material with built-in cushioning and the release material itself. Background Technology

[0002] Release materials are typically smooth, primarily providing release force and bonding with the adhesive surface. Later release materials have evolved to include non-plain (grid) textures, forming special venting channels when bonded to the adhesive surface, thus expanding their applications. However, once bonded to the adhesive surface, release materials offer no protection to the adhesive-covered material, often requiring additional cushioning packaging. Common cushioning materials include plastic and paper-based materials. While these materials provide good cushioning, they have drawbacks: they require additional packaging processes, limiting efficiency; they are bulky and take up space; and foreign matter such as paper dust can affect material cleanliness.

[0003] Therefore, a special material needs to be designed that combines release and cushioning packaging, providing cushioning capabilities while meeting the requirements of adhesive materials. This would make adhesive materials safer during manufacturing and transportation, without the need for additional cushioning packaging and processes. Summary of the Invention

[0004] To overcome the shortcomings of the prior art, the first objective of this invention is to provide a method for preparing a release material with built-in cushioning, comprising the following steps:

[0005] Step 1: Corona discharge is applied to the surface of the PET raw material;

[0006] Step 2: Thoroughly mix LDPE, LLDPE, and HDPE in a mass ratio of 1:1:1 to 4:1:1, wherein the amount of LDPE and LLDPE is at least twice that of HDPE; after heating and bridging at 250-280℃, the film head temperature is 280-310℃ during coating, and the film is coated onto both sides of the pretreated raw material. Use cooling rollers to press one or both sides of the coated layer to obtain a PET coated material with raised features;

[0007] Step 3: Apply 100% silicone release agent to one or both sides of the PET film material, dry at 80-130℃, and cure at 50℃ for 2 days to obtain the final product.

[0008] Preferably, the corona discharge in step one is 8KW.

[0009] Preferably, the temperature of the cooling roller in step two is 35-40°C.

[0010] Preferably, during the coating process in step two, the extrusion pressure is 5.8-8.3 MPa, and the coating amount is not less than 25 g / m³. 2 .

[0011] Preferably, a cooling roller with hemispherical or four-sided diamond-shaped recesses is used in step two.

[0012] Preferably, the amount of silicone coating during the application of the silicone release agent in step three is 1.5 or more.

[0013] A second objective of this invention is to provide a release material obtained by the method for preparing a self-cushioning release material as described above; comprising a substrate layer, a coating layer with protrusions coated on one or both sides of the substrate layer, and an organosilicon release layer coated on the coating layer; wherein the coating layer is composed of at least one of HDPE, LLDPE, and LDPE; and the shape of the protrusions includes hemispherical protrusions and tetrahedral protrusions.

[0014] Preferably, the release layer is prepared from the following components: vinyl-terminated polydimethylsiloxane, methylhydrosiloxane, and perlite catalyst.

[0015] Preferably, the hemispherical protrusions have a diameter of 30 μm and a spacing of 18 μm; the four-sided rhomboid protrusions have a side length of 25 μm, a central height of 20 μm, and a spacing of 30 μm.

[0016] Compared with existing technologies, the beneficial effects of this invention are as follows: This invention relates to a method for preparing a release material with built-in cushioning, comprising the following steps: Step 1: Corona discharge is applied to the surface of PET raw material; Step 2: LDPE, LLDPE, and HDPE are thoroughly mixed in a mass ratio of 1:1:1-4:1:1, heated and bridged at 250-280℃, with the film head temperature at 280-310℃ during lamination, laminating to both sides of the pretreated raw material, and pressing one or both sides of the lamination layer with cooling rollers to obtain a PET lamination material with raised features; Step 3: A 100% solids content silicone release agent is coated on one or both sides of the PET lamination material, dried at 80-130℃, and cured at 50℃ for 2 days to obtain the final product. This invention also relates to a release material. The release material prepared in this way not only possesses certain cushioning properties but also release properties, and has broad application prospects in the field of electronic packaging.

[0017] The above description is merely an overview of the technical solution of the present invention. In order to better understand the technical means of the present invention and to implement it in accordance with the contents of the specification, the preferred embodiments of the present invention are described in detail below. Specific embodiments of the present invention are given in detail in the following examples. Detailed Implementation

[0018] The present invention will now be further described in conjunction with specific embodiments. It should be noted that, without conflict, the various embodiments or technical features described below can be arbitrarily combined to form new embodiments.

[0019] To overcome the shortcomings of the prior art, the present invention relates to a method for preparing a release material with built-in cushioning, comprising the following steps:

[0020] Step 1: Corona discharge is applied to the surface of the PET raw material;

[0021] LDPE, LLDPE, and HDPE are thoroughly mixed in a mass ratio of 1:1:1 to 4:1:1, with the amount of LDPE and LLDPE being at least twice that of HDPE. After heating and bridging at 250-280℃, the film head temperature is 280-310℃ during lamination. The film is then applied to both sides of the pretreated raw material. Cooling rollers are used to press one or both sides of the laminated layer to obtain a PET laminated material with raised features.

[0022] Step 3: Apply a 100% solids silicone release agent to one or both sides of the PET film material, dry it at 80-130℃, and cure it at 50℃ for 2 days to obtain the final product. This release material not only has certain cushioning properties, but also release properties, and has broad application prospects in the field of electronic packaging.

[0023] In some embodiments, the corona discharge in step one is 8KW; because too low a corona discharge will result in poor bonding between PE and PET, while a high corona discharge may break down the PET substrate.

[0024] In some embodiments, the temperature of the cooling roller in step two is 35-40°C.

[0025] In some embodiments, during the coating process in step two, the extrusion pressure is 5.8-8.3 MPa, and the coating amount is not less than 25 g / m³. 2 The extrusion pressure is related to the amount extruded by the single screw of the coating equipment; too high or too low pressure will lead to uneven thickness and incomplete coating layers. Insufficient coating amount will result in incomplete hemispherical and tetrahedral shapes.

[0026] In some embodiments, a cooling roller with hemispherical or four-sided diamond-shaped recesses is used in step two, which is obtained by pressing the PET with a strip-shaped cooling roller during PE coating; the resulting release material has a good cushioning effect.

[0027] In some embodiments, the amount of silicone coating during the application of the silicone release agent in step three is greater than 1.5; a certain amount of silicone coating is required to cover the protrusions and prevent the release layer from having insufficient silicone.

[0028] In some embodiments, during the drying process in step three, the drying temperature is 80-130℃. Specifically, 80-100℃ is the initial temperature range, 120-130℃ is the final high-temperature range, and 90-110℃ is the final low-temperature range. These three temperature ranges are distributed across the eight sections of the oven: 10m in the initial section, 20m in the middle section, and 10m in the final section.

[0029] This invention also relates to a release material obtained by the above-described method for preparing a self-cushioning release material; it includes a substrate layer, a raised coating layer coated on one or both sides of the substrate layer, and an organosilicon release layer coated on the coating layer; wherein the coating layer is composed of at least one of HDPE, LLDPE, and LDPE; and the shape of the raised portion includes hemispherical raised portion and four-sided rhomboid raised portion. The release material of this invention not only possesses certain cushioning properties but also release properties, and has broad application prospects in the field of electronic packaging.

[0030] In some embodiments, the release layer is prepared from the following components: vinyl-terminated polydimethylsiloxane (solvent-free silicone oil), methylhydrosiloxane, and perlite catalyst. This composition is environmentally friendly, inexpensive, requires low curing temperatures, and can be used efficiently.

[0031] In some embodiments, the hemispherical protrusions have a diameter of 30 μm and a spacing of 18 μm; the four-sided rhomboid protrusions have a side length of 25 μm, a central height of 20 μm, and a spacing of 30 μm; so as to provide a cushioning performance on the non-use surface.

[0032] Example 1

[0033] A release material with built-in cushioning, characterized by comprising the following steps:

[0034] Step 1: Corona discharge is applied to the surface of the PET raw material using an 8.0kW corona discharge electrode;

[0035] Step 2: LDPE, LLDPE, and HDPE are thoroughly mixed in a mass ratio of 4:1:1. The mixture is then heated to 250-280℃ for cross-linking. During film coating, the film head temperature is 280-310℃. The film is coated onto both sides of the pretreated raw material. The extrusion pressure is 5.8-8.3 MPa, and the coating weight is not less than 25 g / m². 2 A cooling roller with a hemispherical recess is used to press one side of the coating layer to obtain a PET coating material with a hemispherical surface on one side. The temperature of the cooling roller is 35-40℃.

[0036] Step 3: Apply 100% silicone release agent to the PET film with hemispherical protrusions. The amount of silicone coating should be more than 1.5. Dry at 80-130℃ and cure at 50℃ for 2 days to finally obtain a release material with hemispherical protrusions on the release surface. The release material includes, from bottom to top: PET substrate layer, PE film layer with hemispherical protrusions, and release layer.

[0037] Example 2

[0038] A release material with built-in cushioning, characterized by comprising the following steps:

[0039] Step 1: Corona discharge is applied to the surface of the PET raw material using an 8.0kW corona discharge electrode;

[0040] Step 2: LDPE, LLDPE, and HDPE are thoroughly mixed in a mass ratio of 4:1:1. The mixture is then heated to 250-280℃ for cross-linking. During film coating, the film head temperature is 280-310℃. The film is coated onto both sides of the pretreated raw material. The extrusion pressure is 5.8-8.3 MPa, and the coating weight is not less than 25 g / m². 2 A cooling roller with a hemispherical recess is used to press one side of the coating layer to obtain a PET coating material with a hemispherical surface on one side. The temperature of the cooling roller is 35-40℃.

[0041] Step 3: Apply a 100% solids silicone release agent to the plain surface of the PET film material. The silicone coating amount should be above 1.5. Dry at 80-130℃ and cure at 50℃ for 2 days to finally obtain a plain release material with hemispherical protrusions. The release material includes, from bottom to top: release layer, PET substrate layer, and PE film layer with hemispherical protrusions.

[0042] Example 3

[0043] A release material with built-in cushioning, characterized by comprising the following steps:

[0044] Step 1: Corona discharge is applied to the surface of the PET raw material using an 8.0kW corona discharge electrode;

[0045] Step 2: LDPE, LLDPE, and HDPE are thoroughly mixed in a mass ratio of 4:1:1. The mixture is then heated to 250-280℃ for cross-linking. During film coating, the film head temperature is 280-310℃. The film is coated onto both sides of the pretreated raw material. The extrusion pressure is 5.8-8.3 MPa, and the coating weight is not less than 25 g / m². 2 The double-sided coating layer is pressed together using a cooling roller with hemispherical recesses to obtain a PET coating material with hemispheres on both sides. The temperature of the cooling roller is 35-40℃.

[0046] Step 3: Apply a 100% solids silicone release agent to the PET film with hemispherical protrusions, with a silicone coating amount of more than 1.5. Dry at 80-130℃ and cure at 50℃ for 2 days to finally obtain a non-plain release material with hemispherical protrusions on the back. The release material includes, from bottom to top: release layer, PE film layer with hemispherical protrusions, PET substrate layer, and PE film layer with hemispherical protrusions.

[0047] Example 4

[0048] A release material with built-in cushioning, characterized by comprising the following steps:

[0049] Step 1: Corona discharge is applied to the surface of the PET raw material using an 8.0kW corona discharge electrode;

[0050] Step 2: LDPE, LLDPE, and HDPE are thoroughly mixed in a mass ratio of 4:1:1. The mixture is then heated to 250-280℃ for cross-linking. During film coating, the film head temperature is 280-310℃. The film is coated onto both sides of the pretreated raw material. The extrusion pressure is 5.8-8.3 MPa, and the coating amount is not less than 25 g / m². 2 The double sides of the coating layer are pressed together using a cooling roller with four diamond-shaped recesses to obtain a PET coating material with four diamond-shaped protrusions on both sides. The temperature of the cooling roller is 35-40℃.

[0051] Step 3: Apply 100% solids silicone release agent to the PET film with four diamond-shaped protrusions. The silicone coating amount is more than 1.5. Dry at 80-130℃ and cure at 50℃ for 2 days to finally obtain a non-plain release material with hemispherical protrusions on the back. The release material includes, from bottom to top: release layer, PE film layer with four diamond-shaped protrusions, PET substrate layer, and PE film layer with four diamond-shaped protrusions.

[0052] Comparative Example 1

[0053] A release material with built-in cushioning, characterized by comprising the following steps:

[0054] Step 1: Corona discharge is applied to the surface of the PET raw material using a 6.0kW corona discharge electrode;

[0055] Step 2: LDPE, LLDPE, and HDPE are thoroughly mixed in a mass ratio of 4:1:1. The mixture is then heated to 250-280℃ for cross-linking. During film coating, the film head temperature is 280-310℃. The film is coated onto both sides of the pretreated raw material. The extrusion pressure is 5.8-8.3 MPa, and the coating weight is not less than 25 g / m². 2 A cooling roller with a hemispherical recess is used to press one side of the coating layer to obtain a PET coating material with a hemispherical surface on one side. The temperature of the cooling roller is 35-40℃.

[0056] Step 3: Apply 100% silicone release agent to the PET film with hemispherical protrusions. The amount of silicone coating should be more than 1.5. Dry at 80-130℃ and cure at 50℃ for 2 days to finally obtain a release material with hemispherical protrusions on the release surface. The release material includes, from bottom to top: PET substrate layer, PE film layer with hemispherical protrusions, and release layer.

[0057] Comparative Example 2

[0058] A release material with built-in cushioning, characterized by comprising the following steps:

[0059] Step 1: Apply a 10.0kW corona discharge to the surface of the PET raw material;

[0060] Step 2: LDPE, LLDPE, and HDPE are thoroughly mixed in a mass ratio of 4:1:1. The mixture is then heated to 250-280℃ for cross-linking. During film coating, the film head temperature is 280-310℃. The film is coated onto both sides of the pretreated raw material. The extrusion pressure is 5.8-8.3 MPa, and the coating weight is not less than 25 g / m². 2 A cooling roller with a hemispherical recess is used to press one side of the coating layer to obtain a PET coating material with a hemispherical surface on one side. The temperature of the cooling roller is 35-40℃.

[0061] Step 3: Apply 100% silicone release agent to the PET film with hemispherical protrusions. The amount of silicone coating should be more than 1.5. Dry at 80-130℃ and cure at 50℃ for 2 days to finally obtain a release material with hemispherical protrusions on the release surface. The release material includes, from bottom to top: PET substrate layer, PE film layer with hemispherical protrusions, and release layer.

[0062] Comparative Example 3

[0063] A release material with built-in cushioning, characterized by comprising the following steps:

[0064] Step 1: Corona discharge is applied to the surface of the PET raw material using an 8.0kW corona discharge electrode;

[0065] Step 2: LDPE, LLDPE, and HDPE are thoroughly mixed in a mass ratio of 4:1:1. The mixture is then heated to 250-280℃ for cross-linking. During film coating, the film head temperature is 280-310℃. The film is coated onto both sides of the pretreated material. The extrusion pressure is 5MPa, and the coating amount is not less than 20g / m². 2 The double sides of the coating layer are pressed together using a cooling roller with four diamond-shaped recesses to obtain a PET coating material with four diamond-shaped protrusions on both sides. The temperature of the cooling roller is 35-40℃.

[0066] Step 3: Apply 100% solids silicone release agent to the PET film with four diamond-shaped protrusions. The silicone coating amount is more than 1.5. Dry at 80-130℃ and cure at 50℃ for 2 days to finally obtain a non-plain release material with hemispherical protrusions on the back. The release material includes, from bottom to top: release layer, PE film layer with four diamond-shaped protrusions, PET substrate layer, and PE film layer with four diamond-shaped protrusions.

[0067] Comparative Example 4

[0068] A release material with built-in cushioning, characterized by comprising the following steps:

[0069] Step 1: Corona discharge is applied to the surface of the PET raw material using an 8.0kW corona discharge electrode;

[0070] Step 2: LDPE, LLDPE, and HDPE are thoroughly mixed in a mass ratio of 4:1:1. The mixture is then heated to 250-280℃ for cross-linking. During film coating, the film head temperature is 280-310℃. The film is coated onto both sides of the pretreated material. The extrusion pressure is 9MPa, and the coating amount is not less than 25g / m². 2 The double sides of the coating layer are pressed together using a cooling roller with four diamond-shaped recesses to obtain a PET coating material with four diamond-shaped protrusions on both sides. The temperature of the cooling roller is 35-40℃.

[0071] Step 3: Apply 100% solids silicone release agent to the PET film with four diamond-shaped protrusions. The silicone coating amount is more than 1.5. Dry at 80-130℃ and cure at 50℃ for 2 days to finally obtain a non-plain release material with hemispherical protrusions on the back. The release material includes, from bottom to top: release layer, PE film layer with four diamond-shaped protrusions, PET substrate layer, and PE film layer with four diamond-shaped protrusions.

[0072] Comparative Example 5

[0073] A release material with built-in cushioning, characterized by comprising the following steps:

[0074] Step 1: Corona discharge is applied to the surface of the PET raw material using an 8.0kW corona discharge electrode;

[0075] Step 2: LDPE, LLDPE, and HDPE are thoroughly mixed in a mass ratio of 4:1:1. The mixture is then heated to 250-280℃ for cross-linking. During film coating, the film head temperature is 280-310℃. The film is coated onto both sides of the pretreated raw material. The extrusion pressure is 5.8-8.3 MPa, and the coating amount is not less than 25 g / m². 2 The two sides of the coating layer are pressed together using a plain-weave cooling roller to obtain a plain-weave PET coating material. The temperature of the cooling roller is 35-40℃.

[0076] Step 3: Apply a 100% solids silicone release agent to the plain PET film with a silicone coating amount of more than 1.5. Dry at 80-130℃ and cure at 50℃ for 2 days to finally obtain a non-plain release material with hemispherical protrusions on the back. The release material includes, from bottom to top: release layer, plain PE film layer, PET substrate layer, and plain PE film layer.

[0077] Comparative Example 6

[0078] A release material with built-in cushioning, characterized by comprising the following steps:

[0079] Step 1: Corona discharge is applied to the surface of the PET raw material using an 8.0kW corona discharge electrode;

[0080] Step 2: LDPE, LLDPE, and HDPE are thoroughly mixed in a mass ratio of 4:1:1. The mixture is then heated to 250-280℃ for cross-linking. During film coating, the film head temperature is 280-310℃. The film is coated onto both sides of the pretreated raw material. The extrusion pressure is 5.8-8.3 MPa, and the coating amount is not less than 25 g / m². 2 The double sides of the coating layer are pressed together using a cooling roller with four diamond-shaped recesses to obtain a PET coating material with four diamond-shaped protrusions on both sides. The temperature of the cooling roller is 35-40℃.

[0081] Step 3: Apply 100% silicone release agent to the PET film with four diamond-shaped protrusions. The silicone coating amount is 1.0. Dry at 80-130℃ and cure at 50℃ for 2 days to finally obtain a non-plain release material with hemispherical protrusions on the back. The release material includes, from bottom to top: release layer, PE film layer with four diamond-shaped protrusions, PET substrate layer, and PE film layer with four diamond-shaped protrusions.

[0082] Comparative Example 7

[0083] A release material with built-in cushioning, characterized by comprising the following steps:

[0084] Step 1: Corona discharge is applied to the surface of the PET raw material using an 8.0kW corona discharge electrode;

[0085] Step 2: LDPE, LLDPE, and HDPE are thoroughly mixed in a mass ratio of 4:1:1. The mixture is then heated to 250-280℃ for cross-linking. During film coating, the film head temperature is 280-310℃. The film is coated onto both sides of the pretreated raw material. The extrusion pressure is 5.8-8.3 MPa, and the coating amount is not less than 25 g / m². 2 The double sides of the coating layer are pressed together using a cooling roller with four diamond-shaped recesses to obtain a PET coating material with four diamond-shaped protrusions on both sides. The temperature of the cooling roller is 35-40℃.

[0086] Step 3: Apply 100% solids silicone release agent to the PET film with four diamond-shaped protrusions. The silicone coating amount is above 1.5. Dry at 70-120℃ and cure at 50℃ for 2 days to finally obtain a non-plain textured release material with four diamond-shaped protrusions. The release material includes, from bottom to top: release layer, PE film layer with four diamond-shaped protrusions, PET substrate layer, and PE film layer with four diamond-shaped protrusions.

[0087] The relevant performance tests were conducted on different embodiments and comparative examples, as shown in Table 1 below.

[0088] Cushioning performance test method: Apply a 10µm adhesive film to a mobile phone screen, then apply release material. Drop the screen from a height of 50cm onto a platform until the screen is damaged, and record the number of drops. The screen remained undamaged after 5 drops.

[0089] Table 1. Detection performance of different embodiments

[0090]

[0091]

[0092] Although embodiments of the present invention have been disclosed above, they are not limited to the applications listed in the specification and embodiments. They can be applied to various fields suitable for the present invention. For those skilled in the art, other modifications can be easily made. Therefore, without departing from the general concept defined by the claims and their equivalents, the present invention is not limited to the specific details and embodiments shown herein.

Claims

1. A method for preparing a release material with built-in cushioning, characterized in that, Includes the following steps: Step 1: Apply corona treatment to the surface of the PET raw material; wherein, the corona treatment in Step 1 is 8KW; Step 2: Thoroughly mix LDPE, LLDPE, and HDPE in a mass ratio of 1:1:1-4:1:1, wherein the amount of LDPE and LLDPE is at least twice that of HDPE; after heating and bridging at 250-280℃, the film head temperature is 280-310℃ during coating, and the film is coated onto both sides of the pretreated raw material. Use cooling rollers to press one or both sides of the coated layer to obtain a PET coated material with raised features; wherein, in Step 2, cooling rollers with hemispherical or four-sided diamond-shaped recesses are used. Step 3: Apply silicone release agent to one or both sides of the PET film material, dry at 80-130℃, and cure at 50℃ for 2 days to obtain the final product.

2. The method for preparing the release material with built-in cushioning as described in claim 1, characterized in that, In step two, the temperature of the cooling roller is 35-40℃.

3. The method for preparing the release material with built-in cushioning as described in claim 1, characterized in that, In step two, during the coating process, the extrusion pressure is 5.8-8.3 MPa, and the coating amount is not less than 25 g / m³. 2 .

4. A release material, said release material being obtained by the preparation method of a self-cushioning release material as described in claim 1; characterized in that, It includes a substrate layer, a coating layer with protrusions applied to one or both sides of the substrate layer, and an organosilicon release layer coated on the coating layer; the shape of the protrusions includes hemispherical protrusions and four-sided rhomboid protrusions.

5. The release material as described in claim 4, characterized in that, The release layer is prepared from the following components: vinyl-terminated polydimethylsiloxane, methylhydrosilicone oil, and platinum catalyst.

6. The release material as described in claim 4, characterized in that, The hemispherical protrusions have a diameter of 30 μm and a spacing of 18 μm; the four-sided rhomboid protrusions have a side length of 25 μm, a height of 20 μm in the middle, and a spacing of 30 μm.

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