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Low-refractive-index optical double-sided adhesive tape and preparation method and application thereof

A low-refractive index, double-sided adhesive technology, applied in the direction of adhesives, adhesive types, polyether adhesives, etc., can solve problems such as stress defects that are difficult to eliminate, adhesive layer cracking, and affect efficiency, and achieve high light transmittance , low haze effect

Inactive Publication Date: 2020-09-18
苏州盛达飞智能科技股份有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] However, the refractive index of the current optical glue is the same as that of glass and PMMA, which is about 1.48. Therefore, the production of optical glue with a lower refractive index is a research focus, and the current optical glue has a large volume shrinkage during the curing process. In the bonding process of optical adhesives, two bonded interfaces are involved, which makes it more difficult to eliminate the stress defects caused by curing shrinkage. After the low-temperature impact test, the adhesive layer cracked, which even seriously affected the bonding strength and product appearance. At present, the optical adhesive inevitably overflows during the lamination process. During the production process, it is necessary to wipe the overflowing adhesive, which affects the efficiency and ease. contaminated product

Method used

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Examples

Experimental program
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preparation example Construction

[0041] In a further preferred embodiment, the preparation method of polyurethane acrylate of the present invention comprises the following steps:

[0042] Heating diisocyanate to 50-60°C, adding polyether diol and catalyst, heating to 70-80°C for 2-3 hours, adding hydroxyl acrylate and polymerization inhibitor to react to obtain polyurethane acrylate.

[0043] The present invention does not specifically limit catalyzer and polymerization inhibitor, can be catalyst and polymerization inhibitor well known in the art, as the example of catalyzer, can enumerate have, dibutyl tin laurate, organic bismuth catalyst; In a kind of preferred embodiment Among them, the weight of the catalyst of the present invention accounts for 0.01 to 0.1 wt% of the total weight of the polyether diol, diisocyanate and hydroxyacrylate; as an example of a polymerization inhibitor, it includes but is not limited to, tert-butyl p-di Phenol, p-methoxyphenol, p-methoxybenzenediol, 2,2,6,6-tetramethylpiperidine...

Embodiment 1

[0084] This example provides a kind of optical double-sided adhesive tape, the preparation raw material of described optical double-sided adhesive tape comprises 80 parts of acrylate prepolymer, 25 parts of reactive diluent and 1 part of photoinitiator, and described acrylate prepolymer comprises polyurethane acrylic acid ester; the reactive diluent includes hexafluoroisopropyl methacrylate; the photoinitiator is 2-hydroxy-2-methyl-1-phenylacetone and 2,4,6-trimethylbenzoyl Ethyl phenylphosphonate, the weight ratio is 1:1.

[0085] The preparation raw material of described polyurethane acrylate comprises polypropylene glycol, dicyclohexylmethane diisocyanate and hydroxyethyl acrylate, and the molar ratio is 1:2:2; The preparation method of described polyurethane acrylate comprises the following steps: dicyclohexylmethane Diisocyanate is heated to 50°C, polypropylene glycol and dibutyltin laurate are added, heated to 75°C for 3 hours, cooled to 50°C, hydroxyethyl acrylate and t...

Embodiment 2

[0090] This example provides a kind of optical double-sided adhesive tape, the preparation raw material of described optical double-sided adhesive tape comprises 80 parts of acrylate prepolymer, 25 parts of reactive diluent and 1 part of photoinitiator, and described acrylate prepolymer comprises polyurethane acrylic acid ester; the reactive diluent includes hexafluoroisopropyl methacrylate, tris(2-hydroxyethyl)isocyanurate triacrylate and trimethylolpropane trimethacrylate in a weight ratio of 1:0.13 : 0.12; the photoinitiator is 2-hydroxy-2-methyl-1-phenylacetone and 2,4,6-trimethylbenzoylphenylphosphonic acid ethyl ester, the weight ratio is 1:1.

[0091] The preparation raw material of described polyurethane acrylate comprises polypropylene glycol, dicyclohexylmethane diisocyanate and hydroxyethyl acrylate, and the molar ratio is 1:2:2; The preparation method of described polyurethane acrylate comprises the following steps: dicyclohexylmethane Diisocyanate is heated to 50°...

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PUM

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Abstract

The invention relates to the technical field of adhesives, in particular to a low-refractive-index optical double-sided adhesive tape and a preparation method and application thereof. The optical double-sided adhesive tape is prepared from the following raw materials in parts by weight: 70-90 parts of an acrylate prepolymer, 15-30 parts of a reactive diluent and 0.1-2 parts of a photoinitiator, wherein the acrylate prepolymer comprises one selected from urethane acrylate, epoxy acrylate and polybutadiene acrylate. The optical double-sided adhesive tape prepared by controlling the prepolymer and the reactive diluent to undergo curing under the action of the photoinitiator has low refractive index which is in range of 1.1-1.38, can be used for bonding touch screens such as soft screens and hard screen and is free of the phenomenon of adhesive overflowing, and a cured outer edge is smooth, high in light transmission and low in haze.

Description

technical field [0001] The invention relates to the technical field of adhesives, and more specifically, the invention relates to a low-refractive-index optical double-sided adhesive and its preparation method and application. Background technique [0002] Benefiting from the rapid development of smartphones and tablet computers in recent years, optically transparent adhesives have been widely used in the field of touch screens. These optical adhesives are colorless and transparent, with high light transmittance, soft film and impact resistance. They are mainly used for lamination and bonding of touch screens, such as: bonding glass cover and ITO glass, and can also be used for bonding touch screens and LCM liquid crystal modules. In addition, optical glue can also be used for the connection of optical components such as electronic paper, projection screens, displays, and lenses. [0003] However, the refractive index of the current optical glue is the same as that of glass...

Claims

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Application Information

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IPC IPC(8): C09J175/16C09J171/02C09J163/10C09J4/02C09J4/06C08G18/75C08G18/76C08G18/67C08G18/66C08G18/48C08G18/10
CPCC08G18/10C08G18/4825C08G18/4833C08G18/4854C08G18/672C08G18/758C08G18/7621C09J4/06C09J163/10C09J175/16C08L71/02C08F279/02C08G18/48
Inventor 林志武高凌文杨滨
Owner 苏州盛达飞智能科技股份有限公司
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