CN114479702A

CN114479702A - Mobile phone film for 3D curved surface display screen and preparation process thereof

Info

Publication number: CN114479702A
Application number: CN202111661969.XA
Authority: CN
Inventors: 韩冬俊
Original assignee: Yancheng Shanzhi Optics Material Co ltd
Current assignee: Yancheng Shanzhi Optics Material Co ltd
Priority date: 2021-12-31
Filing date: 2021-12-31
Publication date: 2022-05-13

Abstract

The invention discloses a mobile phone film for a 3D curved surface display screen, which comprises an OCA (optically clear adhesive) layer, a PET (polyethylene terephthalate) film layer, a polarizing film layer and a protective layer which are sequentially arranged from bottom to top; wherein the adhesive used by the OCA adhesive layer comprises a penetrating agent capable of eliminating the white edge of the mobile phone. The invention also discloses a preparation process of the mobile phone film, and after the mobile phone film is prepared, the mobile phone film is roll-coated on the curved glass in a mode of matching low-vacuum hot pressing with the profiling bubble removing mechanism. The invention adopts the mode of matching the low vacuum hot pressing with the profiling bubble removing mechanism, improves the precision of film pasting, not only can ensure that no bubble is generated in the film pasting process, but also can ensure that the energy consumption is low during the vacuum pumping, save energy and reduce consumption. The low-hardness roller is matched with vacuumizing, so that bubbles can be removed during film pasting, and the vacuumizing energy consumption is low.

Description

Mobile phone film for 3D curved surface display screen and preparation process thereof

Technical Field

The invention relates to a mobile phone film for a 3D curved surface display screen and a preparation process thereof.

Background

The smart phone panel market is increased at an explosive speed every year, protective materials are required to be used in the whole processing and transportation process and the smart phone assembling and transportation process of the touch panel of the smart phone, and the size of the smart phone is over 4 square inches, so that the using amount of the protective materials in the whole processing industrial chain of the smart phone is very large. The characteristics of the 3D curved glass meet the design requirements of 3C products. 3C product designs such as smart mobile phones, smart watches, tablet computers, wearable smart products, instrument panels and the like appear 3D products in succession, and have clearly guided the development direction of 3D curved glass. The panel protective glass is light, thin, transparent, clean, fingerprint-resistant, anti-glare, hard, scratch-resistant, good in weather resistance and the like, can be molded into 3D multi-shape panel protective glass applied to terminal products such as high-end smart phones, tablet computers, wearable equipment, instrument panels, industrial computers and the like; compared with a 2D plane screen, the 3D curved screen is more difficult to paste the film on, and the mobile phone film is required to be pasted on the screen without bubbles and has higher requirement on film pasting precision.

Disclosure of Invention

The invention aims to overcome the defects in the prior art and provide a mobile phone film for a 3D curved surface display screen and a preparation process thereof.

In order to achieve the purpose, the technical scheme of the invention is to design a mobile phone film for a 3D curved display screen and a preparation process thereof, wherein the mobile phone film comprises an OCA (optically clear adhesive) layer, a PET (polyethylene terephthalate) film layer, a polarizing film layer and a protective layer which are sequentially arranged from bottom to top; wherein the adhesive used by the OCA adhesive layer comprises a penetrating agent capable of eliminating the white edge of the mobile phone. Oca (optical Clear adhesive) is used for special adhesives for gluing transparent optical elements such as lenses and the like. The light-transmitting material is required to be colorless and transparent, has the light transmittance of more than 95 percent, has good bonding strength, can be cured at room temperature or middle temperature, and has the characteristics of small curing shrinkage and the like. The OCA optical cement is one of the raw materials of the important touch screen. The optical acrylic adhesive is made into a double-sided adhesive tape without a base material, and then a layer of release film is respectively adhered to an upper bottom layer and a lower bottom layer. It is the best adhesive for touch screens. Its advantages are high clearness, high optical transparency (99% of total light transmittance), high adhesion, high weatherability, water resistance, high resistance to high temp and ultraviolet, controlled thickness, uniform spacing, and no yellowing, peeling and deterioration.

The further technical scheme is that the penetrating agent is prepared from low-hydrogen silicone oil with active hydrogen mass fraction of 0.05-0.70%, 1-hexadecene and platinum catalyst with platinum mass fraction of 0.005.

The further technical scheme is that the low-hydrogen silicone oil, the 1-hexadecene and the platinum catalyst are prepared from the following components in parts by weight: 4000:985.6:1.

The further technical scheme is that the preparation method of the penetrant comprises the following steps: mixing, stirring and heating low-hydrogen silicone oil, 1-hexadecene and a platinum catalyst in corresponding parts by weight to 145 ℃, then continuously stirring for four hours and then cooling.

The invention also provides a technical scheme that the process for preparing the mobile phone film for the 3D curved-surface display screen comprises the following process steps: coating OCA glue on the lower surface of the PET film, coating fixing glue on the lower surface of the PET film, sequentially laminating a polarizing film and a protective film on the fixing glue, laminating release paper under the OCA glue, standing, leveling, and thermally curing at 120 ℃ to obtain the mobile phone film for the 3D curved display screen.

The further technical scheme is that after the mobile phone film is prepared, the mobile phone film is roll-coated on curved glass in a mode of matching low-vacuum hot pressing with a profiling bubble removing mechanism. Compared with the film pasting process of the 2D plane screen, the 3D curved surface screen has no straight edge, so that the CCD visual detection has no edge positioning, the copying bubble removing mechanism can avoid the problem, the film can be well pasted by matching with vacuumizing, and the vacuumizing can be realized without high vacuum degree due to the matching of the two, so that the cost is saved.

The further technical proposal is that the profiling bubble removing mechanism comprises a pair of low-hardness rollers which are arranged up and down and have Shore hardness below 30; the roller is arranged in the vacuum chamber, and the vacuum chamber is vacuumized and the film sticking position of the curved glass is heated while the film is stuck on the curved glass by the copying bubble removing mechanism. A heating device, such as a heating nozzle for spraying hot air into the vacuum chamber, is arranged in the vacuum chamber, so that the mobile phone film is heated to realize hot pressing during film pasting. The other technical scheme is that the profiling bubble removing mechanism comprises compression rollers which are arranged in pairs from top to bottom, a flexible air bag is coated outside the compression rollers and is in a circular ring shape sleeved outside the compression rollers, the two compression rollers are driven simultaneously, and the rotation directions are opposite, so that the film can be pasted on the curved surface screen (curved surface glass), the air bag can be completely attached to the curved surface screen, the roller-shaped profiling bubble removing mechanism is in line contact with the curved surface glass, and the pair of compression rollers rotate simultaneously, so that a driving roller (corresponding to a mobile phone film on the curved surface glass) which is equivalent to the curved surface glass (comprising the mobile phone film on the curved surface glass) is provided with a vacuum cavity in a matching way, and a roller shaft of the driving roller is rotatably arranged on the inner side wall of the vacuum cavity, so that the curved surface of the curved surface screen is well matched, the film pasting precision can be ensured, and bubbles in the film pasting process can be removed; in order to further ensure the precision of the film pasting, the connecting plates can be pasted on two opposite side surfaces (namely the end surfaces of a non-curved surface but a plane) of the curved glass, and the arc-shaped sliding groove for sliding the connecting rod is arranged on the inner side wall of the cavity of the vacuum cavity, so that the problem that if the movement of the press roller has errors, the movement track can be accurate through the copying arc-shaped sliding groove can be avoided. The pair of rollers are driven simultaneously to realize bubble removal film pasting on the curved glass, and the rotation axis of the rollers is perpendicular to the advancing direction of the mobile phone film due to low hardness, so that the rollers also play a role in driving the mobile phone film and the curved glass to advance when rotating, and the vacuum cavity is vacuumized while the rollers are used for expelling bubbles to paste the film, thereby further preventing bubbles from being generated.

Further, the vacuum chamber has a vacuum degree of 2KPa to 10 KPa.

The invention has the advantages and beneficial effects that: compared with the film pasting process of the 2D plane screen, the 3D curved surface screen has no straight edge, so that the CCD visual detection has no edge positioning, the copying bubble removing mechanism can avoid the problem, the film can be well pasted by matching with vacuumizing, and the vacuumizing can be realized without high vacuum degree due to the matching of the two, so that the cost is saved.

The pair of rollers are driven simultaneously to realize bubble removal film pasting on the curved glass, and the rotation axis of the rollers is perpendicular to the advancing direction of the mobile phone film due to low hardness, so that the rollers also play a role in driving the mobile phone film and the curved glass to advance when rotating, and the vacuum cavity is vacuumized while the rollers are used for expelling bubbles to paste the film, thereby further preventing bubbles from being generated.

Drawings

FIG. 1 is a schematic view of a working state of a film for a mobile phone for a 3D curved display screen according to the present invention;

FIG. 2 is a schematic view of the rollers and curved glass portion of FIG. 1;

fig. 3 is a cross-sectional view taken along the line a-a in fig. 1.

In the figure: 1. a roller; 2. curved glass; 3. a vacuum chamber; 4. and a bearing.

Detailed Description

The following description of the embodiments of the present invention will be made with reference to the accompanying drawings. The following examples are only for illustrating the technical solutions of the present invention more clearly, and the protection scope of the present invention is not limited thereby.

The first embodiment is as follows:

as shown in fig. 1 to 3, the invention relates to a mobile phone film for a 3D curved display screen and a preparation process thereof, comprising an OCA glue layer, a PET film layer, a polarizing film layer and a protective layer which are sequentially arranged from bottom to top; wherein the adhesive used by the OCA adhesive layer comprises a penetrating agent capable of eliminating the white edge of the mobile phone. The penetrating agent is prepared from low-hydrogen silicone oil with active hydrogen mass fraction of 0.05%, 1-hexadecene and platinum catalyst with platinum mass fraction of 0.005. The low-hydrogen silicone oil, the 1-hexadecene and the platinum catalyst are prepared from the following components in percentage by mass: 200g, 49.28g and 0.05 g. The preparation method of the penetrant comprises the following steps: mixing, stirring and heating low-hydrogen silicone oil, 1-hexadecene and a platinum catalyst in corresponding parts by weight to 145 ℃, then continuously stirring for four hours and then cooling. The process for preparing the mobile phone film for the 3D curved surface display screen comprises the following process steps: coating OCA glue on the lower surface of the PET film, coating fixing glue on the lower surface of the PET film, sequentially laminating a polarizing film and a protective film on the fixing glue, laminating release paper under the OCA glue, standing, leveling, and thermally curing at 120 ℃ to obtain the mobile phone film for the 3D curved display screen. After the mobile phone film is prepared, the mobile phone film is roll-coated on the curved glass in a mode of matching low-vacuum hot pressing with a profiling bubble removing mechanism. The profiling bubble removing mechanism comprises a pair of low-hardness rollers 1 which are arranged up and down and have Shore hardness of 30; the roller 1 is arranged in the vacuum chamber, two sides of the roller 1 are connected with the vacuum chamber through a bearing 4 fixedly arranged on the inner side wall of the vacuum chamber and a connecting seat (a bearing matched with the roller is also arranged on the connecting seat) in the middle of the roller, and the film is pasted on the curved glass by a copying bubble removing mechanism at the film pasting position of the curved glass by vacuumizing the vacuum chamber and heating the curved glass. The vacuum chamber was kept at 2 KPa.

Example two:

the difference from the first embodiment is only that the penetrating agent is composed of low hydrogen-containing silicone oil with active hydrogen mass fraction of 0.70%; the profiling bubble removing mechanism comprises a pair of low-hardness rollers 1 which are arranged up and down and have Shore hardness of 20; the vacuum chamber was kept at 10 Kpa.

Example three:

the difference from the first embodiment is only that the penetrating agent is composed of low hydrogen-containing silicone oil with active hydrogen mass fraction of 0.50%; the profiling bubble removing mechanism comprises a pair of low-hardness rollers 1 which are arranged up and down and have Shore hardness of 10; the vacuum chamber was kept at a vacuum of 7 Kpa.

Comparative example one:

the mobile phone film comprises a film body, an upper protective layer and a lower protective layer; the membrane body comprises a plane area and an arc surface area, and the plane area and the arc surface area are integrally formed; an airtight adjusting bag is arranged on the lower surface of the arc surface area, the upper side wall of the adjusting bag is seamlessly bonded with the arc surface area, and the lower side wall of the adjusting bag is tightly attached to the upper side wall; the adjusting bag is also provided with a hidden injection port; the lower protection layer is attached below the membrane body, the upper protection layer is attached above the membrane body, a fixed adhesive layer is attached to the position, opposite to the arc surface area, of the upper protection layer, the fixed adhesive layer extends out of the arc surface area, and the adjusting capsule is adhered to the fixed adhesive layer after being flatly attached to the arc surface area; the arc-edge-attached mobile phone film further comprises a matched white edge removing bottle, wherein the white edge removing bottle comprises a bottle body and a bottle mouth, and white edge removing liquid is filled in the bottle body. Taking out the bottle with the white edge removed, inserting the bottle mouth into the injection hole, slowly removing the upper protective layer, separating the adjusting bag from the fixed glue layer so as to recover the freedom, slowly injecting the white edge removing liquid into the adjusting bag, and gradually expanding the adjusting bag so that the lower wall of the adjusting bag is gradually attached to the arc edge of the screen; after a proper amount of white edge removing liquid is injected, the adjusting bag is perfectly filled in the white edge area, the adjusting bag extrudes air in the white edge area, large-angle refraction of light rays when the light rays are transmitted between the screen and the film body is effectively reduced, and further chromatic aberration is reduced, so that the effect of eliminating white edges is achieved.

Comparative example two:

heating a mould for processing the curved mask; 2) putting a flat-plate-shaped curved surface film raw material to be processed into the die, driving the upper die and the lower die to move, and pressing the curved surface film raw material; 3) and after the curved surface film is pressed, driving the mold to continuously move to be in contact with a cold water plate arranged below the mold, wherein a pipeline for cold water circulation is arranged in the cold water plate, and the cold water plate is used for cooling the mold in a high-temperature state. 4) And taking the formed curved surface film out of the mold, and then placing the curved surface film on a heating carrier for cooling, wherein the heating carrier has a certain temperature which is lower than the temperature of the curved surface film taken out of the mold. In the step 1), the heating device heats the upper die and the lower die simultaneously. In the step 1), the upper die is heated by using an electrified coil arranged around the periphery of the upper die. And 3) placing a cold water plate below the lower die, arranging a pressure-bearing spring between the lower die and the cold water plate, wherein the cold water plate is not in contact with the die in a high-temperature state during die pressing, and driving the lower die to move to compress the pressure-bearing spring after die pressing is finished so as to enable the lower die to be in contact with the cold water plate for cooling. The lower part of the lower die is connected with an isolation plate, the isolation plate is made of a material capable of isolating a magnetic field, and the pressure-bearing spring is connected between the isolation plate and the cold water plate. The periphery of the die is provided with a side plate and a top plate which are used for supporting, cold water holes for circulating cold water are formed in the side plate and the top plate, and when the curved surface film is processed according to the processing steps, the cold water holes of the top plate and the side plate can be used for circulating cold water to cool the whole machine. In the step 2), when the mold is driven to move, the upper mold and the lower mold are both provided with driving mechanisms to drive the upper mold and the lower mold, and when the mold is pressed, the lower driving device drives the lower mold to reach a certain vertical height, and then the upper driving device drives the upper mold to press downwards, so that the mold pressing action is performed. The partition board and the cold water plate are respectively provided with a blind hole at the position connected with the pressure-bearing spring, and when the partition board is pressed to be completely contacted with the cold water plate, the pressure-bearing spring is trapped in the blind hole.

After the manual detection and observation of the above examples and comparative examples, the comparison conditions are as follows:

examples are represented by S and comparative examples are represented by D; (N/Y) indicates no bubble and a bubble, respectively.

The foregoing is only a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, various modifications and decorations can be made without departing from the technical principle of the present invention, and these modifications and decorations should also be regarded as the protection scope of the present invention.

Claims

The mobile phone film for the 3D curved-surface display screen is characterized by comprising an OCA adhesive layer, a PET film layer, a polarizing film layer and a protective layer which are sequentially arranged from bottom to top; wherein the adhesive used by the OCA adhesive layer comprises a penetrating agent capable of eliminating the white edge of the mobile phone.
2. The mobile phone film for the 3D curved display screen according to claim 1, wherein the penetrating agent is prepared from low hydrogen silicone oil with active hydrogen mass fraction of 0.05-0.70%, 1-hexadecene and platinum catalyst with platinum mass fraction of 0.005.
3. The mobile phone film for the 3D curved display screen according to claim 2, wherein the low hydrogen-containing silicone oil, the 1-hexadecene and the platinum catalyst are prepared from the following components in parts by weight: 4000:985.6:1.
4. The mobile phone film for the 3D curved display screen according to claim 3, wherein the preparation method of the penetrant comprises the following steps: mixing, stirring and heating low-hydrogen silicone oil, 1-hexadecene and a platinum catalyst in corresponding parts by weight to 145 ℃, then continuously stirring for four hours and cooling.
5. The process for preparing the mobile phone film for the 3D curved display screen according to any one of claims 1 to 4, which is characterized by comprising the following process steps: coating OCA glue on the lower surface of the PET film, coating fixing glue on the lower surface of the PET film, sequentially laminating a polarizing film and a protective film on the fixing glue, laminating release paper under the O CA glue, standing, leveling, and thermally curing at 120 ℃ to obtain the mobile phone film for the 3D curved display screen.
6. The process for preparing a mobile phone film for a 3D curved display screen according to claim 5, wherein after the mobile phone film is prepared, the mobile phone film is roll-coated on the curved glass by adopting a low vacuum hot press fit profiling bubble removing mechanism.
7. The process for preparing a mobile phone film for a 3D curved display screen according to claim 6, wherein the profiling bubble removing mechanism comprises a pair of low hardness rollers with a Shore hardness of less than 30, which are arranged up and down; the roller is arranged in the vacuum chamber, and the vacuum chamber is vacuumized and the film sticking position of the curved glass is heated while the film is stuck on the curved glass by the copying bubble removing mechanism.
8. The process for preparing a mobile phone film for a 3D curved display screen according to claim 7, wherein the vacuum chamber has a vacuum degree of 2KPa to 10 KPa.