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TPU protective film, and TPU base film and preparation method thereof

A technology of protective film and base film, applied in the direction of film/flake adhesive, coating, adhesive, etc., can solve the problems of serious warpage, limited hardness by process, easy cracking, etc., to broaden application scenarios and fields , The process is simple and controllable, and the liquid flow is good.

Active Publication Date: 2021-08-03
江西昊泽光学膜科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004]At present, a common solution is to apply a self-healing layer on the surface of the TPU film. Because the texture of the repairing layer is soft, it feels dry and not smooth enough, and the material of the TPU film is also soft. The self-healing TPU film is easy to leave obvious nail marks during use on the screen, which affects the user experience
Another solution is to apply a hardened scratch-resistant layer on the soft material TPU film, which is easy to crack and warp seriously, which will adversely affect the subsequent process and limit its use.
[0005]The TPU film currently on the market is basically a film made by traditional melt extrusion casting, while the cast TPU film with high hardness has many crystal points and uneven thickness. There are many defects, and the hardness is limited by the process, so the price is higher

Method used

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  • TPU protective film, and TPU base film and preparation method thereof
  • TPU protective film, and TPU base film and preparation method thereof
  • TPU protective film, and TPU base film and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0051] A method of preparing a TPU protective film, which includes the steps of:

[0052] Step 1: Mounting a 50 um silicone oil exemplary film 400, release force 10GF; platen binding is 60 um low-viscous silica protective film 500, silica gel peeling force 3GF; the dissolved TPU solution screw meter Pumping into the slit head, filtering the core specification 10 um, using a slit coating method to coating the TPU solution in silicone oil 400, TPU solution comprises 30 parts of TPU elastic rubber particles (hardness 88A) 4.5-parts of the chain extender, 13 parts of isocyanate curing agent, 0.5 parts of the leveling agent, 40 parts of butanone, 30 parts of ethyl acetate, 5 parts of the Hwhenecanone; the TPU solution is 35.9%, viscosity 850cp, the narrow When the spray is applied, the line speed is 4m / min, the welding pump speed is 32 rpm, and the oven drying is solidified, the temperature is arranged to be the first section 50 ° C, the second section 80 ° C, the third section 120 °...

Embodiment 2

[0056] A method of preparing a TPU protective film, which includes the steps of:

[0057] Step 1: Volume 1 is 50 um thick silicon oil separated film 400, release force 8GF; platen binding is 60 um low-viscous silica protective film 500, silica gel viscosity 2.5GF; screw for dissolved TPU solution The pumping pump is pumped into a slit head, and the filter core specification is 10um, and the TPU solution is applied in the release film in a slit coating method; the TPU solution includes 28 parts of TPU elastic rubber particles (hardness 98a), 3 parts of the chain extender, 8 part isocyanate curing agents, 0.5 parts of the leveling agent, 50 parts of butanone, 20 parts of ethyl acetate, 6 partial cyclohexanone; TPU solution solid content 32.1%, viscosity 730CPS; slit coating When the line speed is 5m / min, the welding pump speed is 35 rpm, and the oven drying is solidified, the temperature is arranged to be the first section 50 ° C, the second section 80 ° C, the third section 120 °...

Embodiment 3

[0061]Step 1: Volume 1 is 50 um thick silicon oil separated film 400, release force 10GF; platen binding is 60 um low adhesive silica protective film, silica gel viscosity 3GF; a solution of TPU solution to dissolve with screw metering pump Pumping to the slit coating head, filtering the core specification 10 um, using a slit coating method to coating the TPU solution in the silicone oil extension film 400, TPU solution comprises 32 serving of TPU elastic classes (hardness 95a), 3.5 parts of the chain extender, 10 part isocyanate curing agents, 0.5 parts of the leveling agent, 50 parts of ketone, 25 parts of ethyl acetate, 6 parts of cyclohexanone; the TPU solution solid content was 34.2%, viscosity 950 cps. When the slit is coated, the wire speed is 5 m / min, the weld pump speed is 36 rpm, and the oven drying is solidified, the temperature is arranged to be a first section 50 ° C, the second 80 ° C, the third section 120 ° C, Section 4 130 ° C, Section 5 130 ° C, Section 80 ° C,...

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Abstract

The invention relates to a TPU protective film, and a TPU base film and a preparation method thereof. The method comprises the following steps: preparing the TPU base film with high Shore hardness by adopting wet precision coating; then coating one surface of the TPU base film with hardening liquid; and coating the other surface of the TPU base film with high-viscosity silica gel glue, thereby obtaining the hardened TPU protective film having a surface hardening layer and capable of being attached to an AF screen through three procedures. The TPU protective film structurally comprises: a bottom film layer; a use layer, which is arranged on the bottom film layer and comprises the hardened layer, the TPU base film and an adhesive layer; and a mask layer, which is arranged on the hardened surface of the use layer. The hardened TPU protective film provided by the invention has good oil stain resistance, fingerprint resistance, smoothness, wear resistance and fitting performance, and is suitable for a protective film product of a curved screen.

Description

Technical field [0001] The present invention relates to the technical field of mobile phone curved screen protective film, and more particularly to a TPU protective film and a TPU base film thereof, a preparation method. Background technique [0002] With the popularity of electronic devices designed by the smartphone screen, and the development of flexible screen terminal equipment, it is necessary to protect the screen to the screen, and the hard PET protective film is attached to the edge of the curved screen. Phenomenon, affecting the effect of use, short service life. [0003] TPU has excellent flexibility, good impact resistance, can effectively prevent screen fragmentation; while soft TPU material can effectively fit the arc without blister, long-term use, does not affect beauty. However, the soft TPU film is not resistant to oil, easy to scratch, uncompellent, and other defects. [0004] It is currently a solution to the surface of the TPU film to be coated with the repai...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08J5/18C08L75/04C09J7/25C08J7/046C09D175/14C09J7/29
CPCC08J5/18C09J7/25C08J7/046C08J7/0427C09J7/29C08J2375/04C08J2475/14C09J2475/006
Inventor 余正波程松波
Owner 江西昊泽光学膜科技有限公司
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