CN212800224U

CN212800224U - A low softening point substrateless thermal bonding 3D protective film

Info

Publication number: CN212800224U
Application number: CN202021379056.XU
Authority: CN
Inventors: 闫文; 董红星
Original assignee: NINGBO HUGHSTAR ADVANCED MATERIAL TECHNOLOGY CO LTD
Current assignee: Ningbo Huizhixing New Material Technology Co ltd
Priority date: 2020-07-14
Filing date: 2020-07-14
Publication date: 2021-03-26
Anticipated expiration: 2030-07-14

Abstract

The utility model discloses a low softening point does not have substrate heat laminating 3D protection film, including from bottom to top stacked gradually down protection from type rete, pressure sensitive adhesive layer, low softening point high hardness layer, TPU layer and last protective film layer. The utility model discloses the 3D protection film had both had better smooth effect of feeling, had extremely strong resilience repair effect again, prevented scraping, durable, and quick hot laminating effect is showing moreover, has improved the grade of the curved membrane of 3D heat, has greatly satisfied sense of touch and the functional requirement that people used, has simplified 3D protective film structure simultaneously, has broken through traditional hot pressing shaping's technology for the laminating is convenient feasible more, improves the laminating yield greatly.

Description

Low-softening-point substrate-free heat-laminating 3D protective film

Technical Field

The utility model relates to a protection film technical field, concretely relates to low softening point does not have substrate heat laminating 3D protection film.

Background

The mobile phone film is a decoration film for decorating and protecting the surface of a mobile phone body, a screen and other objects. In order to meet the multifunctional experience of consumers, the diversification development of the functions of the film products becomes a key. The defects of the existing protective film still include: the protective film is not strong enough, the surface of the protective film can be scratched by slight collision or scratch to leave scratches, the appearance is affected, and the operation hand feeling of the common protective film is not good.

With the rapid development of the modern mobile phone industry, 3D products such as curved screens become a development trend, but the traditional protective film has the problem of poor substrate forming effect, and meanwhile, hot press forming causes the loss of film materials and the inherent changes of the properties such as mechanics, appearance and the like of the materials, so that the film materials are sensitive to processing and production, further, the hot press process is high in cost, and the yield of the adhered curved screens is low. The existing hot bending protective film has poor flexibility, cannot achieve good fitting performance, reduces the protective effect, is easy to have appearance and other adverse conditions in the hot bending forming process, and cannot achieve qualified appearance visual effect.

SUMMERY OF THE UTILITY MODEL

The utility model aims to solve the technical problem that overcome background art's technical defect, provide a low softening point does not have substrate heat laminating 3D protection film. The utility model discloses the 3D protection film has saved the substrate part than ordinary hot bending membrane structure, practices thrift the cost, has broken through the produced disadvantage of traditional hot briquetting's processing technology simultaneously, for example traditional hot pressing can produce the consumptive material, leads to the temperature resistant of material, mechanical properties unstable through high temperature high pressure, and the easy warpage of laminating screen and wrinkling to hot pressing technology is loaded down with trivial details, and the processing procedure is with high costs, places for a long time and produces the deformation easily, leads to a series of problems such as defective rate increase by a wide margin.

The utility model provides an above-mentioned technical problem adopted technical scheme as follows:

the utility model provides a low softening point does not have substrate heat laminating 3D protection film, includes from bottom to top that stacks gradually down protection from type rete, pressure sensitive adhesive layer, low softening point high hardness layer, TPU layer and last protection film layer.

In the technical scheme, the low-softening-point high-hardness layer has high hardness and has the characteristic of low-temperature rapid softening; the TPU layer has the characteristics of scratch resistance and smooth touch feeling; the pressure-sensitive adhesive layer has an adhesive function.

Among the above-mentioned technical scheme, each glue film of 3D protection film is in the thermal deformation in-process, and the short-term key of the internal structure of low softening point high hardness layer is separated, softens flagging laminating protection screen fast, and TPU layer glue film is soft, and low modulus shrinkage deformation takes place the phenomenon of upwarping, and pressure sensitive adhesive layer is heated the glue film and is warp the screen of easily laminating.

Further, the thickness ratio of the TPU layer to the low-softening-point high-hardness layer is 0.4-1.0, so that the TPU layer is more generally suitable for functional films with different structural sizes, and the structural regulation and control are more flexible.

Further, the lower protective release film layer is a fluorine release film or a non-fluorine non-silicon release film.

Further, the thickness of the lower protective release film layer is 50-75 μm.

Further, the pressure-sensitive adhesive layer is made of organic silicon pressure-sensitive adhesive.

Further, the thickness of the pressure-sensitive adhesive layer is 5-15 microns.

Furthermore, the material of the low-softening-point high-hardness layer is polyurethane TPE, and the polyurethane TPE can be quickly softened and droop at 70 ℃ for 10s after being coated to prepare a film, so that the protective film can achieve the excellent effects of quick hot fitting, tightness and no rebound; the low-softening-point high-hardness layer has the characteristics of high hardness and rapid softening by heating.

Further, the thickness of the low softening point and high hardness layer is 40-100 μm.

Further, the TPU layer is made of TPU, and after coating, the TPU layer has the characteristics of quick repair and smooth hand feeling; the TPU layer has a self-repairing effect of smooth hand feeling.

Further, the thickness of the TPU layer is 35-100 mu m.

Further, the upper protective film layer is a silica gel protective film.

Further, the thickness of the upper protective film layer is 50-75 μm.

Compared with the prior art, the beneficial effects of the utility model are that:

(1) the utility model discloses 3D protection film need not blooming, substrate, need not hot briquetting, need not be to its shaping through compression equipment promptly, only need make laminating object and protection film heat 10s at 70 ℃, the membrane body can self produce the hot bending phenomenon and automatically adhere and spread on 3D glass body structure, the overall structure is stereotyped fast after the cooling, keeps the effect of applying, does not kick-back and sticks up, continuously protects the cell-phone screen, and follow-up processing is more convenient;

(2) the utility model discloses the 3D protection film had both had better smooth effect of feeling, had extremely strong resilience repair effect again, prevented scraping, durable, and quick hot laminating effect is showing moreover, has improved the grade of the curved membrane of 3D heat, has greatly satisfied sense of touch and the functional requirement that people used, has simplified 3D protective film structure simultaneously, has broken through traditional hot pressing shaping's technology for the laminating is convenient feasible more, improves the laminating yield greatly.

Drawings

Fig. 1 is a schematic structural diagram of a 3D protective film according to embodiment 1 of the present invention;

fig. 2 is a schematic view of a thermal deformation process of a structure layer of the 3D protective film according to embodiment 1 of the present invention.

The corresponding part names for the various reference numbers in the figures are:

1-placing a release-protecting film layer; 2-a pressure sensitive adhesive layer; 3-a layer of low softening point and high hardness; 4-a TPU layer; 5-upper protective film layer; 6-heating body.

Detailed Description

For a better understanding of the present invention, reference is made to the following detailed description and accompanying drawings. It should be understood that these examples are for further illustration of the present invention only, and are not intended to limit the scope of the present invention. It should be further understood that after reading the above description of the present invention, those skilled in the art will make certain insubstantial changes or modifications to the present invention, and shall still fall within the scope of the present invention.

Example 1

A low-softening-point substrate-free heat-bonding 3D protective film is shown in figure 1 and comprises a lower protective release film layer 1, a pressure-sensitive adhesive layer 2, a low-softening-point high-hardness layer 3, a TPU layer 4 and an upper protective film layer 5 which are sequentially stacked from bottom to top.

The low-softening-point high-hardness layer 3 has high hardness and has the characteristic of rapid softening at low temperature; the TPU layer 4 has the characteristics of scratch resistance and smooth touch; the pressure-sensitive adhesive layer 2 functions as an adhesive.

The lower protective release film layer 1 is a fluorine release film.

The thickness of the lower protective release film layer 1 is 50 μm.

The pressure-sensitive adhesive layer 2 is made of organic silicon pressure-sensitive adhesive.

The thickness of the pressure-sensitive adhesive layer 2 was 10 μm.

The low-softening-point and high-hardness layer 3 is made of polyurethane TPE, can be quickly softened and droop at 70 ℃ for 10s after being coated to prepare a film, and can promote the protective film to achieve the excellent effects of quick hot fitting, tightness and no rebound; the low softening point high hardness layer 3 can be directly commercially available.

The thickness of the low softening point high hardness layer 3 was 80 μm.

The TPU layer 4 is made of TPU, and the TPU layer 4 has the characteristics of quick repair and smooth hand feeling after being coated; the TPU layer 4 is commercially available directly.

The thickness of the TPU layer 4 is 55 μm.

The upper protective film layer 5 is a silica gel protective film.

The thickness of the upper protective film layer 5 was 50 μm.

Wherein the total thickness of the pressure sensitive adhesive layer 2, the low softening point high hardness layer 3 and the TPU layer 4 is 145 mu m, and the thickness ratio of the TPU layer/the low softening point high hardness layer is 0.687.

And (3) coating and laminating the layers in sequence according to the structure 2-3-1-4-5 of the figure 1, and performing subsequent cutting to obtain the low-softening-point substrate-free hot-bonding 3D protective film.

The low softening point does not have substrate hot laminating 3D protection film of this embodiment has saved the substrate part than ordinary hot bending membrane structure (by the lower protection that stacks gradually from bottom to top from type rete, organosilicon pressure sensitive adhesive layer, the TPU layer, the OCA layer, the substrate layer, HC layer and last protection silica gel rete are constituteed), has not only simplified the structure, the cost is practiced thrift, and only need through low temperature 70 ℃, heat 10s alright reach the inseparable effect that does not rebound of laminating, follow-up cross cutting processing is easy and simple to handle, the production yield is improved, maintain the original characteristic of material.

Example 2

This example is substantially the same as example 1 except that the thickness of the TPU layer 4 is 50 μm, the total thickness of the pressure-sensitive adhesive layer 2, the low softening point high hardness layer 3, and the TPU layer 4 is 140 μm, and the ratio of the thickness of the TPU layer/the low softening point high hardness layer is 0.625.

Example 3

This example is substantially the same as example 1 except that the thickness of the low softening point high hardness layer 3 is 70 μm, the thickness of the TPU layer 4 is 50 μm, the total thickness of the pressure-sensitive adhesive layer 2, the low softening point high hardness layer 3, and the TPU layer 4 is 130 μm, and the thickness ratio of the TPU layer/low softening point high hardness layer is 0.714.

Example 4

This example is substantially the same as example 1 except that the thickness of the TPU layer 4 is 35 μm, the total thickness of the pressure-sensitive adhesive layer 2, the low-softening-point high-hardness layer 3, and the TPU layer 4 is 125 μm, and the thickness ratio of the TPU layer/low-softening-point high-hardness layer is 0.437.

Example 5

This example is substantially the same as example 1 except that the thickness of the low-softening point high-hardness layer 3 is 100 μm, the thickness of the TPU layer 4 is 80 μm, the total thickness of the pressure-sensitive adhesive layer 2, the low-softening point high-hardness layer 3, and the TPU layer 4 is 190 μm, and the thickness ratio of the TPU layer/low-softening point high-hardness layer is 0.8.

Example 6

This example is substantially the same as example 1 except that the thickness of the low-softening-point high-hardness layer 3 was 60 μm, the thickness of the TPU layer 4 was 40 μm, the total thickness of the pressure-sensitive adhesive layer 2, the low-softening-point high-hardness layer 3, and the TPU layer 4 was 110 μm, and the ratio of the thickness of the TPU layer/the low-softening-point high-hardness layer was 0.667.

The utility model discloses the theory of operation of 3D protection film:

the utility model discloses the theory of operation of 3D protection film is that the high hardness layer thickness of adjustment TPU/low softening point compares the control heat laminating effect. Namely, the protective film body consists of a pressure sensitive adhesive layer 2, a low softening point high hardness layer 3 and a TPU layer 4. The low-softening-point high-hardness layer 3 has the characteristics of high hardness and low softening point, and the TPU layer 4 has good scratch-resistant repair resilience. Fig. 2 shows the situation that each layer of film is deformed (the arrow of the solid line indicates the stress deformation direction) in the heating process of the 3D protective film described in embodiment 1 (the arrow of the dotted line indicates the heating direction), that is, when the protective film is heated to 70 ℃ for lamination, first, the internal structure of the 3 high-hardness layer with low softening point extends first, so that the short-time bonding of the hydrogen bond/van der waals force acting between molecules is released to generate excellent flexibility, the internal structure generates a certain creep, the whole structure is heated to be quickly softened and easily subjected to heat lamination, when cooled, the whole structure is quickly bonded and shaped, and the stiffness and the shaping effect when being recovered to normal temperature are good and can not rebound and reverse tilt. In addition, the TPU layer 4 is directly coated on the low softening point high hardness layer 3, and has the characteristics of softness and easy tensile resilience, so that the structure is shrunk and changed when being heated, and the low softening point high hardness layer 3 is dragged to be warped. And then, pressure sensitive adhesive layer 2 is scribbled in low softening point high hardness layer 3 bottom, is heated and also can produce certain gluey deformation, because pressure sensitive adhesive plays the adhesion nature and laminates about protecting, its shrink is favorable to expanding the laminating window, makes the laminating inseparabler, keeps the design effect of preferred. Therefore, the utility model discloses the key point lies in that the thickness ratio of regulating and controlling TPU layer/low softening point high hardness layer both compound glue film reaches the flexible degree of fine setting overall structure and improves the purpose of laminating stability and yield, the utility model discloses can satisfy the hot protection film of pasting of 3D of different structure size thickness, its structural design is more nimble.

Effects of the embodiment

The 3D protective films prepared in examples 1 to 6 were subjected to basic physical property index detection, and hot-stick evaluation was performed at different temperatures (60 ℃ C., 70 ℃ C.) and different times (10s, 20 s).

TABLE 1 detection of basic physical property indexes of 3D protective films prepared in examples 1 to 6

As can be seen from table 1, the utility model discloses after the above-mentioned optimized structural scheme has been taken to the 3D protection film, it has that the transparency is high, the surface is smooth, prevent the effect of scraping and place for a long time that the heat pastes the effect stable, difficult bubbling, durable, can be used to make 3D protection film product. The utility model discloses the quick heat of low softening point no substrate heat laminating 3D protection film heating back of preparation is stereotyped well, and the smooth respond well in top layer, and the laminating of pressure sensitive adhesive layer and cell-phone screen is firm, and the temperature toleration is good.

The above description is not intended to limit the present invention, and the present invention is not limited to the above examples. Those skilled in the art should also realize that changes, modifications, additions, or substitutions can be made without departing from the spirit and scope of the invention.

Claims

1. A low softening point heat-bonding 3D protective film without a base material, characterized in that it comprises a lower protective release film layer (1), a pressure-sensitive adhesive layer (2), a low softening point layer that are stacked sequentially from bottom to top High hardness layer (3), TPU layer (4) and upper protective film layer (5).

2. A kind of low softening point substrateless thermal bonding 3D protective film as claimed in claim 1, characterized in that the thickness ratio of the TPU layer (4) to the low softening point high hardness layer (3) is 0.4 to 1.0.

3 . The low softening point substrate-free thermally bonded 3D protective film according to claim 1 , wherein the lower protective release film layer ( 1 ) has a thickness of 50-75 μm. 4 .

4 . The low softening point substrateless thermally bonded 3D protective film according to claim 1 , wherein the material of the pressure-sensitive adhesive layer ( 2 ) is a silicone pressure-sensitive adhesive. 5 .

5 . The low softening point substrateless thermally bonded 3D protective film according to claim 1 , wherein the pressure-sensitive adhesive layer ( 2 ) has a thickness of 5-15 μm. 6 .

6 . The low softening point substrateless thermally bonded 3D protective film according to claim 1 , wherein the material of the low softening point and high hardness layer ( 3 ) is polyurethane TPE. 7 .

7 . The low softening point substrateless thermally bonded 3D protective film according to claim 1 , wherein the thickness of the low softening point and high hardness layer ( 3 ) is 40-100 μm. 8 .

8 . The low softening point substrateless thermally bonded 3D protective film according to claim 1 , wherein the thickness of the TPU layer ( 4 ) is 35-100 μm. 9 .

9 . The low softening point substrate-free thermal bonding 3D protective film according to claim 1 , wherein the upper protective film layer ( 5 ) is a silicone protective film. 10 .

10 . The low softening point substrateless thermally bonded 3D protective film according to claim 1 , wherein the upper protective film layer ( 5 ) has a thickness of 50-75 μm. 11 .