Release film for foamed silica gel

Abstract

The utility model discloses a release film for foamed silica gel, which comprises a base material layer, a moisture-proof layer, an upper heat-resistant shrinkage layer, a lower heat-resistant shrinkage layer, an adhesive layer, a lubricating layer and a protective layer which are sequentially adhered from top to bottom. According to the utility model, the structural design is reasonable, the lubricating layer is in contact with the foaming silica gel for use, the stripping effect is good, the moisture-proof layer has better moisture-proof effect, heat resistance and puncture resistance, and the protection effect is good; during high-temperature curing, the upper heat-resistant shrinkage layer and the lower heat-resistant shrinkage layer on the upper surface and the lower surface of the base material layer can improve the heat-resistant shrinkage performance of a release film product, effectively solve the shrinkage deformation problem, ensure the smoothness of the foamed silica gel, have good comprehensive performance, have heat-resistant shrinkage and stripping performance and good moisture-proof effect, and effectively ensure the quality of the foamed silica gel.

Description

Technical Field

[0001] The utility model relates to the technical field of release films, in particular to a release film for foamed silica gel. Background Art

[0002] In recent years, the development of the global new energy vehicle industry has entered the fast lane, the new energy vehicle market has flourished, and the demand for foamed silicone has also increased year by year. Foamed silicone is also called addition-type silicone. It is composed of silicone and curing agent in a certain proportion. After white vulcanization, it becomes a soft elastic material. It is an environmentally friendly material. The products produced are non-toxic, odorless, safe and hygienic. The density of silicone foam products (0.3-0.7g / cm 3 ), the cross-section of the foam is fine, similar to the three-dimensional structure of the honeycomb, with good resilience and mechanical strength, and is currently widely used.

[0003] In the foaming silicone molding process, a release film is needed as a carrier to carry the viscous foaming silicone liquid into the oven for baking and curing. The production temperature is 150-200℃. Due to differences in the process, some foaming silicone products are baked for too long, which will cause the release film to shrink and deform. When the foaming silicone is cured on the wrinkled release film surface, shrinkage lines are left on the surface of the foaming silicone. At the same time, it is cured for a long time at a temperature of 150-200℃. The traditional release film is a silicone oil release film, and its silicone oil layer will age and become brittle, causing the general release film surface peeling performance to decrease, resulting in the foaming silicone being bonded to the surface of the release film when the release film and the foaming silicone need to be separated for use after the release film is bonded. In addition, after the foaming silicone is manufactured, because the foaming silicone is soft, fluffy inside, and has small pores, it will absorb moisture or dust in the air if placed for a long time, resulting in a decrease in product performance. Therefore, it is necessary to develop a release film for foaming silicone that is resistant to heat shrinkage, has good peeling performance, and has a moisture-proof effect. Utility Model Content

[0004] In view of the above-mentioned shortcomings, the utility model aims to provide a release film for foamed silicone which has a reasonable structural design and has good heat shrinkage resistance, peeling performance and moisture-proof effect.

[0005] In order to achieve the above-mentioned purpose, the utility model provides the following technical solutions:

[0006] A release film for foamed silicone comprises a substrate layer, a moisture-proof layer, an upper heat-resistant shrinkage layer, a lower heat-resistant shrinkage layer, an adhesion layer, a lubricating layer and a protective layer, wherein the moisture-proof layer, the upper heat-resistant shrinkage layer, the substrate layer, the lower heat-resistant shrinkage layer, the adhesion layer, the lubricating layer and the protective layer are laminated in sequence from top to bottom.

[0007] As a preferred solution of the utility model, the moisture-proof layer is a BOPP aluminized film and a PE aluminized film with a thickness of 30 to 80 microns. BOPP aluminized film and PE aluminized film have good light blocking properties and good moisture-proof effects, and also have properties such as heat resistance and puncture resistance, and are low in cost.

[0008] As a preferred solution of the utility model, the upper heat-resistant shrinkage layer or the lower heat-resistant shrinkage layer is a polyimide film or PC composite film with a thickness of 10 to 40 microns, which effectively enhances the mechanical properties of the substrate layer and thereby improves the overall heat-resistant shrinkage performance of the release film product.

[0009] As a preferred solution of the utility model, the substrate layer is a silicone film or a PU film with a thickness of 50 to 125 microns, which has the advantages of ultra-thin thickness, softness, elasticity and corrosion resistance.

[0010] As a preferred solution of the utility model, the adhesion layer is a UV mesh film, PEVA embossed film or PP embossed film with a thickness of 25 to 65 microns. Since the UV mesh film, PEVA embossed film or PP embossed film has corresponding gravure patterns, it can accommodate more paraffin, while also increasing the contact area and improving the adhesion, allowing the lubricating layer to effectively and stably adhere to its surface.

[0011] As a preferred solution of the utility model, the lubricating layer is a palm wax layer or a polyethylene wax layer with a thickness of 5 to 10 microns, which has high stability, is not easy to be thermally decomposed, has strong adhesion and good lubrication effect.

[0012] As a preferred solution of the utility model, the protective layer is a matte PET film layer with a thickness of 25 to 75 microns, which has excellent mechanical properties, good toughness, good protective effect, and can avoid dust pollution and scratch damage.

[0013] The beneficial effects of the utility model are as follows: the utility model has a reasonable structural design, can effectively improve the moisture-proof effect through the moisture-proof layer, and has good heat resistance and puncture resistance, good protection effect, and can avoid dust pollution and scratch damage problems; upper and lower heat-resistant shrinkage layers are compounded on the upper and lower surfaces of the substrate layer, which effectively improves the heat-resistant shrinkage performance of the release film product, effectively solves the problem of shrinkage deformation that is prone to occur during high-temperature curing, and ensures the flatness of the foamed silicone; the lubricating layer is better adhered through the adhesion layer, is not easy to delaminate, and has good structural stability. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 It is a schematic diagram of the cross-sectional structure of the utility model. DETAILED DESCRIPTION

[0015] Example 1: See Figure 1An embodiment of the utility model provides a release film for foamed silicone, comprising a substrate layer 1, a moisture-proof layer 2, an upper heat-resistant shrinkage layer 3, a lower heat-resistant shrinkage layer 4, an adhesion layer 5, a lubricating layer 6 and a protective layer 7. The moisture-proof layer 2, the upper heat-resistant shrinkage layer 3, the substrate layer 1, the lower heat-resistant shrinkage layer 4, the adhesion layer 5, the lubricating layer 6 and the protective layer 7 are sequentially laminated in order from top to bottom.

[0016] Wherein, the moisture-proof layer 2 is preferably a BOPP aluminized film with a thickness of 50 microns. The upper heat-resistant shrinkage layer 3 and the lower heat-resistant shrinkage layer 4 are preferably polyimide films with a thickness of 25 microns. The substrate layer 1 is a silicone film with a thickness of preferably 100 microns, a haze of 2.5%, and a tensile strength of 165 MPA. The adhesion layer 5 is a UV grid film with a thickness of preferably 35 microns, that is, a UV film with a grid gravure printed on the surface. The lubricating layer 6 is palm wax, which is coated on the adhesion layer 5 by micro-dimpled or anilox roller or doctor blade to form a palm wax layer with a thickness of 5 microns. The protective layer 7 is preferably a matte PET film layer with a thickness of 50 microns.

[0017] Embodiment 2: The embodiment of the utility model provides a release film for foamed silicone, which has basically the same structure as that of Embodiment 1, except that the moisture-proof layer 2 is preferably a PE aluminum-plated film with a thickness of 75 microns. The upper heat-resistant shrinkage layer 3 and the lower heat-resistant shrinkage layer 4 are preferably PC composite films with a thickness of 35 microns. The substrate layer 1 is a PU film with a thickness of preferably 50 microns, a haze of 1.5%, and a tensile strength of 150 MPA. The adhesion layer 5 is a PP embossed film with a thickness of preferably 30 microns, and the surface of the PP embossed film is covered with diamond-shaped gravures. The lubricating layer 6 is preferably polyethylene wax, and is coated on the adhesion layer 5 by micro-dimpled or anilox roller or doctor blade to form a polyethylene wax layer with a thickness of 8 microns. The protective layer 7 is preferably a matte PET film layer with a thickness of 25 microns.

[0018] Embodiment 3: The embodiment of the utility model provides a release film for foamed silicone, which has basically the same structure as that of embodiment 1, except that the moisture-proof layer 2 is preferably a BOPP aluminized film with a thickness of 30 microns. The upper heat-resistant shrinkage layer 3 is a polyimide film with a thickness of 10 microns. The lower heat-resistant shrinkage layer 4 is preferably a PC composite film with a thickness of 40 microns. The substrate layer 1 is a 50-micron silicone film. The adhesion layer 5 is a PEVA embossed film with a thickness of 25 microns, and the surface of the PP embossed film is covered with checkered gravure. The lubricating layer 6 is a palm wax layer with a thickness of preferably 10 microns. The protective layer 7 is a matte PET film layer with a thickness of 75 microns.

[0019] Embodiment 4: The embodiment of the utility model provides a release film for foamed silicone, which is basically the same as the structure of embodiment 1, except that the moisture-proof layer 2 is preferably a PE aluminum-plated film with a thickness of 80 microns. The upper heat-resistant shrinkage layer 3 is a polyimide film with a thickness of 40 microns. The lower heat-resistant shrinkage layer 4 is a PC composite film with a thickness of 10 microns. The substrate layer 1 is a PU film with a thickness of preferably 125 microns. The adhesion layer 5 is a UV grid film with a thickness of 65 microns. The lubricating layer 6 is a polyethylene wax layer with a thickness of 10 microns. The protective layer 7 is preferably a matte PET film layer with a thickness of 25 microns.

[0020] The above embodiments are only preferred implementations of the present utility model. The present utility model cannot list all implementations one by one. Any technical solution that adopts one of the above embodiments, or equivalent changes made according to the above embodiments, are within the protection scope of the present utility model.

[0021] When in use, tear off the matte PET film layer and use it in contact with the foamed silicone through the lubricating layer 6, the peeling effect is good, and the moisture-proof layer 2 has good moisture-proof effect as well as heat resistance and puncture resistance, and the protection effect is good; when cured at high temperature, the upper and lower heat-resistant shrinkage layers 4 on the upper and lower surfaces of the substrate layer 1 can improve the heat shrinkage resistance of the release film product, effectively solve the shrinkage deformation problem, ensure the flatness of the foamed silicone, and have good comprehensive performance, with heat resistance, peeling performance and moisture-proof effect, effectively ensuring the quality of the foamed silicone.

[0022] According to the disclosure and teaching of the above specification, technicians in the field of the utility model can also change and modify the above implementation. Therefore, the utility model is not limited to the specific implementations disclosed and described above, and some modifications and changes to the utility model should also fall within the scope of protection of the claims of the utility model. In addition, although some specific terms are used in this specification, these terms are only for the convenience of description and do not constitute any limitation to the utility model. Other membranes that are the same or similar to them are all within the scope of protection of the utility model.

Claims

1. A release film for foamed silica gel, comprising a substrate layer, characterized in that: It also includes a moisture-proof layer, an upper heat-resistant shrinkage layer, a lower heat-resistant shrinkage layer, an adhesion layer, a lubricating layer and a protective layer, and the moisture-proof layer, the upper heat-resistant shrinkage layer, the substrate layer, the lower heat-resistant shrinkage layer, the adhesion layer, the lubricating layer and the protective layer are sequentially laminated from top to bottom.

2. The release film for foamed silica gel according to claim 1, characterized in that: The moisture-proof layer is a BOPP aluminized film and a PE aluminized film with a thickness of 30 to 80 microns.

3. The release film for foamed silica gel according to claim 1, characterized in that: The upper anti-heat shrinkage layer or the lower anti-heat shrinkage layer is a polyimide film or a PC composite film with a thickness of 10 to 40 microns.

4. The release film for foamed silica gel according to claim 1, characterized in that: The substrate layer is an organic silicon film or a PU film with a thickness of 50 to 125 microns.

5. The release film for foamed silica gel according to claim 1, characterized in that: The adhesive layer is a UV grid film, a PEVA embossed film or a PP embossed film with a thickness of 25 to 65 microns.

6. The release film for foamed silica gel according to claim 1, characterized in that: The lubricating layer is a palm wax layer or a polyethylene wax layer with a thickness of 5 to 10 microns.

7. The release film for foamed silica gel according to any one of claims 1 to 6, characterized in that: The protective layer is a matte PET film layer with a thickness of 25 to 75 microns.

Images