Low-dielectric high-strength flexible transparent conductive film for folding screens

A transparent conductive film, low dielectric technology, applied in the direction of cable/conductor manufacturing, conductive materials dispersed in non-conductive inorganic materials, conductors, etc., can solve the problem that the service life or bending life cannot meet the requirements, and it is difficult to conduct layers Good adhesion to substrates, low dielectric properties of transparent conductive films, etc., to achieve the effects of conductivity and transparency, good adhesion and reliability, and increase cross-linking density

Active Publication Date: 2021-11-23
SHUNDE POLYTECHNIC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Moreover, it is difficult to achieve good adhesion between the conductive layer and the substrate by spraying or coating the nano-silver wire layer on the surface of existing substrates such as PET, COP or aramid, and silver will appear in the long-term bending process. Separation between wire layer and substrate
Therefore, it is difficult to achieve a good balance in the aspects of low dielectric property, flexibility, stiffness, resilience, and adhesion of the conductive layer in the transparent conductive film developed by the patents reported, which leads to the development of flexible transparent screens. Among them, because the transparent conductive film is immature, the service life or bending life cannot meet the requirements

Method used

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  • Low-dielectric high-strength flexible transparent conductive film for folding screens
  • Low-dielectric high-strength flexible transparent conductive film for folding screens
  • Low-dielectric high-strength flexible transparent conductive film for folding screens

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] (1) Synthesis of Naphthalene Cyclic Polyethylene Glycol Acrylate

[0031] In solvent A, add naphthalene ring-type tetrafunctional epoxy resin (HP-4700 from DIC Japan), polyethylene glycol methacrylate and basic catalyst, react at 80°C for 1 hour, and then purify To obtain naphthalene ring-type polyethylene glycol acrylate, the mass ratio of naphthalene ring-type tetrafunctional epoxy resin, polyethylene glycol methacrylate and basic catalyst is 1:1:0.01, and the chemical reaction equation is shown in the figure below :

[0032]

[0033] where n is 5;

[0034] The basic catalyst is triethylamine, and the solvent A is formamide.

[0035] (2) Synthesis of naphthyl fluorene polythiol

[0036] Add 9,9-Bis(6-hydroxy-2-naphthyl)fluorene (CAS number: 934557-66-1), ethylene sulfide, basic catalyst and solvent A together, the reaction temperature is 60°C, and the reaction Naphthylfluorene polythiol can be obtained after 2 hours, wherein the mass ratio of 9,9-Bis(6-hydroxy-2-...

Embodiment 2

[0044] (1) Synthesis of Naphthalene Cyclic Polyethylene Glycol Acrylate

[0045] In solvent A, add naphthalene ring-type tetrafunctional epoxy resin (HP-4700 from DIC Corporation of Japan), polyethylene glycol methacrylate and basic catalyst, react at a temperature of 120°C for 4 hours, and then purify To obtain naphthalene ring-type polyethylene glycol acrylate, the mass ratio of naphthalene ring-type tetrafunctional epoxy resin, polyethylene glycol methacrylate and basic catalyst is 1:5:0.04, and its synthesis route is shown in the figure below:

[0046]

[0047] where n is 15;

[0048] The basic catalyst is potassium carbonate, and the solvent A is tetramethylethylenediamine.

[0049] (2) Synthesis of naphthyl fluorene polythiol

[0050] Add 9,9-Bis(6-hydroxy-2-naphthyl)fluorene (CAS number: 934557-66-1), ethylene sulfide, basic catalyst and solvent A together, the reaction temperature is 120°C, and the reaction Naphthylfluorene polythiol can be obtained after 5 hours...

Embodiment 3

[0058] (1) Synthesis of Naphthalene Cyclic Polyethylene Glycol Acrylate

[0059] In solvent A, add naphthalene ring-type tetrafunctional epoxy resin (HP-4700 from DIC Japan), polyethylene glycol methacrylate and basic catalyst, react at 100°C for 3 hours, and then purify Obtain naphthalene ring-type polyethylene glycol acrylate, wherein the mass ratio of naphthalene ring-type tetrafunctional epoxy resin, polyethylene glycol methacrylate and basic catalyst is 1:3:0.03, and its synthesis route is shown in the figure below :

[0060]

[0061] where n is 10;

[0062] The basic catalyst is sodium carbonate, and the solvent A is dioxane.

[0063] (2) Synthesis of naphthyl fluorene polythiol

[0064] Add 9,9-Bis(6-hydroxy-2-naphthyl)fluorene (CAS number: 934557-66-1), ethylene sulfide, basic catalyst and solvent A together, the reaction temperature is 100°C, and the reaction After 3 hours, naphthyl fluorene polythiol can be obtained, in which the mass ratio of 9,9-Bis(6-hydrox...

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Abstract

The invention relates to a low-dielectric high-strength flexible transparent conductive film dedicated to folding screens, which is characterized in that it includes naphthalene ring-type polyethylene glycol acrylate, naphthyl fluorene polythiol, acrylate diluent, mercaptan diluent, nano Silver wire and photoinitiator are fully mixed together to make a spraying liquid, and then spray the spraying liquid on the release film, in an oven at a temperature of 40-60 ° C, using a 365-400 nm LED ultraviolet lamp with an energy of 200 -500mW / cm 2 Irradiate for 30-120s, and then peel off the cured film from the release paper to obtain a low-dielectric high-strength flexible transparent conductive film for folding screens. It has the characteristics of rigid-flexible combination, long-term repeated bending will not cause creases and creep, low dielectric properties, good adhesion and reliability.

Description

technical field [0001] The invention belongs to the field of flexible transparent conductive films, in particular to a low-dielectric high-strength flexible transparent conductive film dedicated to folding screens. Background technique [0002] There is a layer of transparent electrodes in the touch screen of smartphones. Most of the current transparent electrodes are made of indium tin oxide (ITO), and its transparency can reach 92%, which is equivalent to glass. But this ITO indium tin oxide film is fragile and cannot be used in flexible electronic devices or displays. With the development of smart phones, curved screens and even folding screens are being gradually promoted. Traditional ITO transparent conductive films cannot meet the requirements, and the industry is gradually developing flexible transparent conductive films. [0003] Three technical solutions based on metal grids, graphene and nano-silver wires are being researched and gradually commercialized, such as ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08L87/00C08L81/02C08K7/06C08J5/18C08G81/00C08G75/08H01B1/22H01B5/16H01B13/00
CPCC08G75/08C08G81/00C08J5/18C08J2387/00C08J2481/02C08K2201/001C08K2201/011H01B1/22H01B5/16H01B13/00
Inventor 刘锋陈燕舞叶瑞庭张浥琨
Owner SHUNDE POLYTECHNIC
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