Looking for breakthrough ideas for innovation challenges? Try Patsnap Eureka!

A preparation method of low-shrinkage, high-hardness, high-wear-resistant transparent polyimide hardened film

A technology of transparent polyimide and hardened film, used in polyether coatings, polyurea/polyurethane coatings, coatings, etc., can solve the problems of other failures, screen crease damage, volume shrinkage, etc., to avoid warpage , reducing and warping, reducing the effect of volume shrinkage

Active Publication Date: 2021-11-05
新纶光电材料(常州)有限公司
View PDF4 Cites 0 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

If it is bent multiple times and used for a long time, after the flexible screen is subjected to multiple compression and tensile stresses, crease damage may appear in the middle of the screen
In addition, circuit boards, components, after being subjected to a lot of bending and non-bending, may also cause damage or other failures during folding
The existing glass panel cannot meet its high frequency requirements, and the transparent polyimide (CPI) film is used to replace the existing glass cover plate because of its good foldability, but polyimide (PI ) The material cannot meet the hardness requirements, and it is necessary to add a hardened film on the surface of the PI film to enhance the hardness
[0003] At present, there are two main problems in the research and development of flexible screen hardening film: one is the contradiction between high hardness and low warpage. Linkage, while conventional vinyl monomers will cause volume shrinkage during the UV curing process, the greater the degree of crosslinking, the more serious the volume shrinkage; the second is the contradiction between high hardness and bendability, through a large number of high-functionality monomers After increasing the cross-linking density to obtain high hardness, the hardened film is usually brittle, and it needs to be properly matched with flexible monomers to improve toughness, and the structure and quantity of flexible monomers will affect whether the hardened film can finally have good bendability. very important

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • A preparation method of low-shrinkage, high-hardness, high-wear-resistant transparent polyimide hardened film
  • A preparation method of low-shrinkage, high-hardness, high-wear-resistant transparent polyimide hardened film
  • A preparation method of low-shrinkage, high-hardness, high-wear-resistant transparent polyimide hardened film

Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0022] The present invention is described in further detail now in conjunction with embodiment.

[0023] The high-functionality urethane acrylate used in this application is 6-functionality urethane acrylate (RJ423), 9-functionality urethane acrylate (RJ4217) and 15-functionality urethane acrylate (RJ4219); The acrylates are BASF's 3.4-functionality polyether acrylate (Laromer LR 8997) and 3.5-functionality polyether acrylate (Laromer PO 94F), and DSM's 4-functionality polyether acrylate (AgiSyn 701) and 4-functionality Polyether acrylate (AgiSyn 703); anti-fingerprint additives are Milo AF-JX 82 perfluoropolyether anti-fingerprint oil and perfluoropolyether anti-fingerprint oil additive HTLC-9633.

[0024] The urethane acrylate used in the comparative example is the 2-functional urethane acrylate (RJ4234) of Liangzhi Chemical; the multi-functional polyether acrylate used in the comparative example is the 2-functional polyether acrylate (AgiSyn 702) of DSM.

[0025] The prepa...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

PropertyMeasurementUnit
thicknessaaaaaaaaaa
thicknessaaaaaaaaaa
degree of polymerizationaaaaaaaaaa
Login to View More

Abstract

The invention belongs to the technical field of transparent polyimide hardened films, and in particular relates to a method for preparing a transparent polyimide hardened film with low shrinkage, high hardness and high wear resistance, comprising the following steps: (1) uniformly coating a hardening liquid on On the transparent polyimide substrate, thermal drying and thermal curing are performed; (2) UV curing is performed, and then annealing treatment is performed. After the hardened film is cooled, the protective film can be attached and cut. The present invention adopts a dual-curing method, firstly by thermally initiating free radical prepolymerization, since thermal curing is to prepolymerize monomers and oligomers first, most of the shrinkage stress will be generated, and there is still solvent in the system after thermal curing , which can effectively eliminate the shrinkage stress generated by polymerization, thereby effectively avoiding shrinkage during thermal curing. In addition, since there is still solvent in the system after thermal curing, thermal curing will not warp, and then UV curing at a lower temperature can be carried out. Effectively reduces volume shrinkage and warpage that occurs during curing.

Description

technical field [0001] The invention belongs to the technical field of transparent polyimide cured film, and in particular relates to a preparation method of a low-shrinkage, high-hardness and high-wear-resistant transparent polyimide cured film. Background technique [0002] Curved screen technology has been widely valued and sought after by consumers and the industry in recent years. In the future, with the continuous development and improvement of fixed-curvature curved screen technology, flexible touch screens that can be bent arbitrarily will become an important development direction. Although the flexible screen can be bent, if it is bent frequently, it will have the same fatigue problem as metal paper. If it is bent multiple times and used for a long time, the flexible screen may be damaged by creases in the middle of the screen after being subjected to multiple compression and tensile stresses. In addition, circuit boards, components, after being subjected to a lot...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
Patent Type & Authority Patents(China)
IPC IPC(8): C08J7/046C09D175/14C09D171/00C09D7/61C09D7/63C08L79/08
CPCC09D175/14C09D7/61C09D7/63C08K2201/011C08K2003/2227C08J2379/08C08J2475/14C08J2471/00C08J7/0427C08L75/14C08L71/00C08K3/22C08K3/36
Inventor 王权
Owner 新纶光电材料(常州)有限公司
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Patsnap Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Patsnap Eureka Blog
Learn More
PatSnap group products

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic, Popular Technical Reports.

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap|About US| Contact US: help@patsnap.com