CN209816011U

CN209816011U - 3D curved surface cell-phone back cover inner rupture membrane

Info

Publication number: CN209816011U
Application number: CN201822267191.4U
Authority: CN
Inventors: 路健; 雷剑; 赵丹鹤
Original assignee: New Hengdong Film Materials (changzhou) Co Ltd
Current assignee: New Hengdong Film Materials (changzhou) Co Ltd
Priority date: 2018-12-29
Filing date: 2018-12-29
Publication date: 2019-12-20
Anticipated expiration: 2028-12-29

Abstract

The utility model belongs to the technical field of the rupture membrane and specifically relates to an rupture membrane in lid behind 3D curved surface cell-phone, the rupture membrane includes polyimide film layer, tie coat and leaves the type rete in proper order behind the 3D curved surface cell-phone in the lid. The utility model takes the polyimide film as the base material of the explosion-proof film, the polyimide film has excellent heat resistance and stretchability, and the base material of the explosion-proof film in the back cover of the 3D curved-surface mobile phone can meet the requirements of the corner part of the curved-surface structure on the stretching and shrinking performance of the material, thereby solving the problems that the PET explosion-proof film can not be completely laminated with the 3D curved surface and the PET explosion-proof film is easy to warp after hot bending processing, and reducing the reject ratio; according to the application, the thickness of the polyimide film is controlled to be 25-100 mu m, the thickness of the bonding layer is controlled to be 10-50 mu m, the thickness of the explosion-proof film is reduced while the bonding effect is ensured, and the thermal bending processing of the explosion-proof film is facilitated; one side of the bonding layer, which is close to the release film layer, is provided with a frosted layer or a texture layer, so that the problem that the processing difficulty of special textures of the rear cover of the existing glass mobile phone is large is solved.

Description

3D curved surface cell-phone back cover inner rupture membrane

Technical Field

The utility model belongs to the technical field of the rupture membrane and specifically relates to a rupture membrane in lid behind 3D curved surface cell-phone.

Background

With the development of science and technology, electronic products such as mobile phones and tablet computers have gone deep into every family, and become an indispensable part of daily life. With the development of double-sided glass technology, double-sided glass gradually becomes the standard matching of a mainstream machine type, but the glass has the defects of poor abrasion resistance and frangibility, and in order to strengthen the glass and avoid hurting people caused by broken and scattered glass, an explosion-proof film is used on back shell glass of an electronic product. At present, electronic products with curved screens are increasingly popular with consumers due to the perfect streamline appearance, electronic product manufacturers develop 3D curved screens and research 3D curved surface rear covers, and the appearance of the electronic products is further improved.

The current explosion-proof film of the back cover of the electronic product mainly takes a PET film as a base material, the back surface of the PET film is coated with an adhesive, and the front surface of the PET film is bonded with glass after being printed and electroplated. The PET film has excellent physical and mechanical properties, and also has excellent optical properties, such as good transparency, low haze and high gloss. However, the PET explosion-proof film can only be used for processing the arc edges of planes and double curved surfaces, the requirement on the stretching and shrinking performance of the material at the corner part of the 3D curved surface structure is very high, the complete adhesion of the PET material and the 3D curved surface is difficult to realize in the prior art, the PET explosion-proof film is easy to warp after the thermal bending processing, and the reject ratio is more than 30%.

SUMMERY OF THE UTILITY MODEL

The invention discloses an inner anti-explosion membrane of a 3D curved surface mobile phone rear cover, aiming at solving the problem that the existing anti-explosion membrane is difficult to be completely attached to a 3D curved surface of a rear cover of an electronic product.

The utility model provides a technical scheme that its technical problem adopted is:

the utility model provides an explosion-proof membrane in lid behind 3D curved surface cell-phone, explosion-proof membrane in lid includes polyimide film layer, tie coat and leaves the type rete in proper order behind 3D curved surface cell-phone.

Specifically, the bonding layer is provided with a frosted layer at one side close to the release film layer.

Specifically, the adhesive layer is provided with a texture layer at one side close to the release film layer.

Specifically, the thickness of the polyimide film layer is 25-100 μm.

Specifically, the thickness of the adhesive layer is 10 to 30 μm.

Specifically, the thickness of the release film layer is 20-40 μm.

Specifically, the polyimide film is a transparent polyimide film, the thickness of the polyimide film is 25-100 μm, the surface of the polyimide film is subjected to corona treatment or acid-base treatment, the light transmittance is greater than 90%, and the haze is less than 1%.

Specifically, the thickness of the above adhesive layer is 10 to 50 μm, preferably 25 μm.

The preparation method of the explosion-proof membrane in the back cover of the 3D curved-surface mobile phone comprises the following steps:

step one, sequentially adding the main resin, the elastic resin and the solvent into a liquid preparation barrel, stirring for 20-40min, and standing for 0.5-2h to prepare a coating liquid with the solid content of 20-60%;

step two, uniformly coating the prepared coating liquid on the surface of the polyimide film, and fully drying at 60-140 ℃ to obtain a bonding layer;

step three, attaching the release film to the surface of the bonding layer to ensure that no bubbles exist in attachment;

curing the product obtained in the step three at 40 ℃ for 2-4 days to obtain an inner anti-explosion membrane of the rear cover of the 3D curved-surface mobile phone;

in the first step, the main resin is one of polyurethane resin, polyester resin and acrylic resin;

in the first step, the elastic resin is organic silicon modified acrylic resin or organic silicon modified polyester resin.

Specifically, in the first step, the mass ratio of the main body resin to the elastic resin is 7-19: 1.

specifically, the solvent is one or more of toluene, xylene, butanone and isopropanol.

Specifically, the polyimide film is subjected to corona treatment or acid-base treatment in advance.

Specifically, a silane coupling agent KH570 is also added in the first step.

Specifically, the amount of the silane coupling agent KH570 added is 1-5% of the total mass of the coating liquid.

And specifically, the second step is that the prepared coating liquid is uniformly coated on the surface of the polyimide film, the polyimide film is kept stand for 5 to 20min and fully dried at the temperature of between 60 and 140 ℃ to obtain the bonding layer.

The utility model has the advantages that: (1) the polyimide film is used as the base material of the explosion-proof film in the rear cover of the 3D curved-surface mobile phone, has excellent heat resistance and stretchability, can meet the requirements of the corner part of a curved-surface structure on the stretching and shrinking performance of the material, solves the problems that the PET explosion-proof film cannot be completely attached to the 3D curved surface and the PET explosion-proof film is easy to warp after hot bending processing, and reduces the reject ratio;

(2) according to the application, the thickness of the polyimide film is controlled to be 25-100 mu m, the thickness of the bonding layer is controlled to be 10-50 mu m, the thickness of the explosion-proof film is reduced while the bonding effect is ensured, and the thermal bending processing of the explosion-proof film is facilitated;

(3) one side of the bonding layer, which is close to the release film layer, is provided with a frosted layer or a texture layer, so that the problem that the processing difficulty of special textures of the rear cover of the existing glass mobile phone is large is solved.

Drawings

The present invention will be further explained with reference to the drawings and examples.

Fig. 1 is a schematic structural diagram of the present invention.

Fig. 2 is a schematic diagram of embodiment 2 of the present invention.

Fig. 3 is a schematic diagram of embodiment 3 of the present invention.

In the figure: 1. a polyimide film layer; 2. a bonding layer; 21. sanding layer; 22. a texture layer; 3. and a release film layer.

Detailed Description

The present invention will now be described in further detail with reference to the accompanying drawings. These drawings are simplified schematic drawings and illustrate the basic structure of the present invention only in a schematic manner, and thus show only the components related to the present invention.

Example 1

As shown in fig. 1, the explosion-proof membrane in the 3D curved surface mobile phone rear cover sequentially comprises a polyimide membrane layer 1, a bonding layer 2 and a release membrane layer 3. The thickness of the polyimide film layer 1 is 25-100 μm, the thickness of the bonding layer 2 is 10-30 μm, and the thickness of the release film layer 3 is 20-40 μm.

Example 2

As shown in fig. 2, the adhesive layer 2 has a frosted layer 21 on the side close to the release film layer 3, and in a specific embodiment, the frosted layer 21 can be obtained by frosting the upper surface of the adhesive layer 2.

Example 3

As shown in fig. 3, the adhesive layer 2 has a texture layer 22 on a side thereof adjacent to the release film layer 3, and in a specific embodiment, the texture layer 22 may be obtained by processing an upper surface of the adhesive layer 2.

the parameters of examples 1 to 5 are shown in Table 1.

TABLE 1

In example 5, after the prepared coating liquid was uniformly applied to the surface of the polyimide film in the second step, the film was allowed to stand for 10 minutes, and then heating and subsequent treatments were performed.

Comparative example 1 is substantially the same as example 5 except that the prepared coating liquid was uniformly applied to the surface of the polyimide film, and then, heating and subsequent treatment were directly performed without leaving to stand.

Comparative example 2 is a commercial explosion-proof film (PET substrate).

The explosion-proof membranes prepared in examples 1 to 5 and comparative examples 1 to 2 were subjected to performance tests, and the test results are shown in table 2.

TABLE 2

In light of the foregoing, it will be apparent to those skilled in the art from this disclosure that various changes and modifications can be made without departing from the spirit and scope of the invention. The technical scope of the present invention is not limited to the content of the specification, and must be determined according to the scope of the claims.

Claims

1. The utility model provides an explosion-proof membrane in lid behind 3D curved surface cell-phone which characterized in that: the inner anti-explosion membrane of the 3D curved-surface mobile phone rear cover sequentially comprises a polyimide membrane layer (1), a bonding layer (2) and a release membrane layer (3).

2. The inner rupture membrane of the rear cover of the 3D curved-surface mobile phone according to claim 1, wherein: one side of the bonding layer (2) close to the release film layer (3) is provided with a frosting layer (21).

3. The inner rupture membrane of the rear cover of the 3D curved-surface mobile phone according to claim 1, wherein: the adhesive layer (2) is provided with a texture layer (22) at one side close to the release film layer (3).

4. The inner rupture membrane of the rear cover of the 3D curved-surface mobile phone according to claim 1, wherein: the thickness of the polyimide film layer (1) is 25-100 mu m.

5. The inner rupture membrane of the rear cover of the 3D curved-surface mobile phone according to claim 1, wherein: the thickness of the bonding layer (2) is 10-30 μm.

6. The inner rupture membrane of the rear cover of the 3D curved-surface mobile phone according to claim 1, wherein: the thickness of the release film layer (3) is 20-40 μm.