CN107099256B - UV (ultraviolet) blocking optical adhesive, optical adhesive film, touch screen and display - Google Patents
UV (ultraviolet) blocking optical adhesive, optical adhesive film, touch screen and display Download PDFInfo
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- CN107099256B CN107099256B CN201710166235.1A CN201710166235A CN107099256B CN 107099256 B CN107099256 B CN 107099256B CN 201710166235 A CN201710166235 A CN 201710166235A CN 107099256 B CN107099256 B CN 107099256B
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- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09J—ADHESIVES; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; USE OF MATERIALS AS ADHESIVES
- C09J4/00—Adhesives based on organic non-macromolecular compounds having at least one polymerisable carbon-to-carbon unsaturated bond ; adhesives, based on monomers of macromolecular compounds of groups C09J183/00 - C09J183/16
- C09J4/06—Organic non-macromolecular compounds having at least one polymerisable carbon-to-carbon unsaturated bond in combination with a macromolecular compound other than an unsaturated polymer of groups C09J159/00 - C09J187/00
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- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09J—ADHESIVES; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; USE OF MATERIALS AS ADHESIVES
- C09J11/00—Features of adhesives not provided for in group C09J9/00, e.g. additives
- C09J11/02—Non-macromolecular additives
- C09J11/06—Non-macromolecular additives organic
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- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09J—ADHESIVES; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; USE OF MATERIALS AS ADHESIVES
- C09J7/00—Adhesives in the form of films or foils
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F3/00—Input arrangements for transferring data to be processed into a form capable of being handled by the computer; Output arrangements for transferring data from processing unit to output unit, e.g. interface arrangements
- G06F3/01—Input arrangements or combined input and output arrangements for interaction between user and computer
- G06F3/03—Arrangements for converting the position or the displacement of a member into a coded form
- G06F3/041—Digitisers, e.g. for touch screens or touch pads, characterised by the transducing means
- G06F3/0412—Digitisers structurally integrated in a display
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Abstract
A UV blocking optical adhesive, an optical adhesive film, a touch screen and a display relate to the technical field of optical display. A UV-blocking optical adhesive comprising the following components: prepolymer, benzotriazole type UV absorber, tackifier, photoinitiator and monomer with linear structure. The UV blocking optical adhesive has the characteristic of high curing rate, and the cured UV blocking optical adhesive has high peeling strength and good ultraviolet blocking effect. An optical adhesive film, a touch screen and a display all comprise a cured product obtained by curing a UV-blocking optical adhesive. The ultraviolet light-resistant coating has low ultraviolet light transmittance and good ultraviolet light blocking effect.
Description
Technical Field
The invention relates to the technical field of displays, in particular to a UV blocking optical adhesive, an optical adhesive film, a touch screen and a display.
Background
Optical displays are used in a wide variety of applications, such as liquid crystal displays, plasma displays, LED displays, OLED displays, and the like. The screen of an optical display is generally composed of a composite glass screen, and the composite glass screen needs an optical adhesive for bonding and fixing. The main component of a general optical adhesive is acrylate resin or polyurethane resin, so that a good adhesive effect of a glass interface can be realized. However, since the general acrylate adhesives cannot block ultraviolet rays, optical devices sensitive to ultraviolet rays are easily aged, and the service life and the visual effect are affected.
Disclosure of Invention
The invention aims to provide a UV-blocking optical adhesive which has the characteristic of excellent curing rate, and the cured UV-blocking optical adhesive has high peel strength and good ultraviolet blocking effect.
The second objective of the present invention is to provide an optical adhesive film with low transmittance to ultraviolet rays.
A third object of the present invention is to provide a touch panel having a better blocking effect against ultraviolet rays.
It is a fourth object of the present invention to provide a display device which is excellent in blocking ultraviolet rays.
The technical problem to be solved by the invention is realized by adopting the following technical scheme.
The invention provides a UV blocking optical adhesive which comprises the following components in parts by weight: 10-50 parts of prepolymer, 10-60 parts of monomer with linear structure, 0.1-2 parts of benzotriazole type UV absorbent and 0.1-3 parts of photoinitiator, wherein the prepolymer comprises polyurethane prepolymer or acrylate prepolymer.
The invention provides an optical adhesive film which comprises a cured product obtained by curing the UV-blocking optical adhesive.
The invention provides a touch screen which comprises a cured product obtained by curing the UV-blocking optical adhesive.
The invention also provides a display which comprises a cured product obtained by curing the UV-blocking optical adhesive.
The embodiment of the invention has the beneficial effects that: a UV blocking optical adhesive is prepared from prepolymer as basic material, benzotriazole type UV absorbent, linear monomer and photoinitiator through ultraviolet curing. The addition of 0.1 to 2 parts by weight of a benzotriazole-type UV absorber based on 10 to 50 parts by weight of the prepolymer can reduce its transmittance to ultraviolet rays. However, the addition of the benzotriazole type UV absorber can inhibit the curing of the prepolymer, the inhibition effect of the benzotriazole type UV absorber is reduced by adding 10-60 parts by weight of a monomer with a linear structure, and the UV-blocking optical adhesive has excellent curing rate and high peel strength.
The UV-blocking optical adhesive can be used for bonding two or more components, and can also be attached to the surfaces of other components by coating and the like.
The UV-blocking optical adhesive can be cured to obtain a cured product. The cured product can be used for optical adhesive films and has low ultraviolet transmittance. In addition, the touch screen and the display provided by the invention have better blocking effect on ultraviolet rays due to the fact that the touch screen and the display contain the cured substance; and the display is not prone to aging.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings needed to be used in the embodiments will be briefly described below, it should be understood that the following drawings only illustrate some embodiments of the present invention and therefore should not be considered as limiting the scope, and for those skilled in the art, other related drawings can be obtained according to the drawings without inventive efforts.
Fig. 1 is a test chart of ultraviolet transmittance of optical adhesive films formed by curing the UV-blocking optical adhesives of example 1 and comparative example 1 according to the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below. In the following, the technical solutions in the embodiments of the present invention will be clearly and completely described in order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer. The examples, in which specific conditions are not specified, were conducted under conventional conditions or conditions recommended by the manufacturer. The reagents or instruments used are not indicated by the manufacturer, and are all conventional products available commercially.
The following describes a UV-blocking optical adhesive and a method for preparing the same according to embodiments of the present invention.
The UV blocking optical adhesive comprises the following components in parts by weight: 10-50 parts of prepolymer, 10-60 parts of monomer with linear structure, 0.1-2 parts of benzotriazole type UV absorbent and 0.1-3 parts of photoinitiator, wherein the prepolymer comprises polyurethane prepolymer or acrylate prepolymer.
The prepolymer is used as a base material, and a benzotriazole type UV absorbent, a photoinitiator and a monomer with a linear structure are added, so that the UV blocking optical adhesive can be formed by curing under the action of ultraviolet rays. The prepolymer is used as a base material, and further comprises polyurethane prepolymer or acrylate prepolymer. The addition of 0.1 to 2 parts by weight of a benzotriazole-type UV absorber based on 10 to 50 parts by weight of the prepolymer can reduce its transmittance to ultraviolet rays. However, the addition of the benzotriazole-type UV absorber inhibits the curing of the prepolymer, and therefore, in the examples of the present invention, the inhibition effect of the benzotriazole-type UV absorber on the photocuring reaction is reduced by adding 10 to 60 parts by weight of the monomer having a linear structure.
The linear structure of the monomer can reduce the inhibitory effect of the benzotriazole-type UV absorber. The monomers include alkyl acrylates, and when the alkyl acrylate monomers have a relatively long chain length, the curing of the prepolymer is not substantially affected by the benzotriazole-type UV absorbers. Thus, preferably, the alkyl group of the alkyl acrylate monomer has at least 6 carbon atoms, and more preferably, the alkyl acrylate monomer has an alkyl group of 6 carbon atoms. Further, the monomer having a linear structure may be selected from pentyl (meth) acrylate, 2-ethylhexyl (meth) acrylate, n-hexane (meth) acrylate, n-octyl (meth) acrylate, isooctyl (meth) acrylate, nonyl (meth) acrylate, isononyl (meth) acrylate, isodecyl (meth) acrylate, tetradecyl (meth) acrylate, octadecyl (meth) acrylate, and isooctadecyl (meth) acrylate, lauryl acrylate, isobornyl acrylate. In the examples of the present invention, the monomers of linear structure are selected from the group consisting of 4-hydroxybutyl acrylate, lauryl acrylate and isobornyl acrylate. In other embodiments, the monomers of linear structure may also be a combination of one, two or more of the above-listed materials. Preferably, the monomer is 20 to 55 parts by weight, and more preferably, the monomer is 30 to 40 parts by weight. When the content of the monomer is within this preferred range, the curing rate of the UV-blocking optical adhesive of the present invention will be higher.
In the examples of the present invention, the average molecular weight of the prepolymer is selected to be 30000 or more in order to improve the stability of the molecular structure and to improve the adhesive strength of the UV-blocking optical adhesive; preferably, the average molecular weight of the prepolymer is 50000 or more, more preferably, the average molecular weight of the prepolymer is 70000 or more. In other embodiments, the average molecular weight of the prepolymer may not be limited, and for example, 30000-. In other embodiments, the prepolymer may be selected not only from polyurethane prepolymers or acrylate prepolymers, but also from one or a combination of two or more of epoxy prepolymers, silicone prepolymers, polyester prepolymers, polyether prepolymers, polyhydroxy polyolefin prepolymers, polybutadiene prepolymers, and fluorine-modified prepolymers. In addition, for durability of the UV-blocking optical adhesive, the prepolymer is preferably of a linear structure.
In the embodiment of the present invention, in order to maintain the effect of absorbing ultraviolet rays for a long time by the UV-blocking optical adhesive after curing, a benzotriazole-type UV absorber having a substituent of 4 or more carbon atoms is preferable. This is because when the benzotriazole-type UV absorber has a substituent having 4 or more carbon atoms, the substituent is entangled with the main molecular chain of the prepolymer, thereby enhancing the durability of the UV-blocking optical adhesive for absorbing ultraviolet rays. Preferably, the benzotriazole type UV absorber is 0.5 to 1.5 parts by weight; further preferably, the benzotriazole type UV absorber is 0.8 to 1.2 parts by weight. The proportion is an optimal value obtained by combining self experience and creative work of the inventor, and the transmittance of the UV blocking optical adhesive to ultraviolet rays can be reduced by adding the benzotriazole type UV absorbent according to the proportion. In the examples of the present invention, 2- (5-chloro-benzotriazolyl) -6-o-tert-butyl-p-cresol was selected as the benzotriazole type UV absorber. In other examples, the benzotriazole-type UV absorbers may also be selected from 3- (2-benzotriazol-2-yl) -5- (1, 1-hydroxyethyl) alkyl esters, 2- (5-chloro-2-benzotriazol-2-yl) -4-methyl-6-tert-butylphenol, 2- (2-benzotriazol-2-yl) -6- (1-methyl-1-phenylethyl) -4- (1,1,3,3-) phenol, 2- (2 '-hydroxy-5-tert-octylbenzotriazole), 2' -methylenebis (6- (benzotriazol-2-yl) -4-tert-octylphenol, di-or tri-t-octylphenol, One, two or more of 6- (2-benzotriazolyl) -4-tert-octyl-6-tert-butyl-4-methyl-2, 2' -methylenebisphenol, trimethyl- (3- (2-benzotriazolyl) -5-tert-butyl-4-hydroxyphenyl) propionic acid and 2- (5-chloro-2-benzotriazolyl) -6-tert-butyl-p-cresol. More preferably, the alkyl ester in the 3- (2-benzotriazole-2-yl) -5- (1, 1-hydroxyethyl) alkyl ester is a linear structure, and even more preferably, the alkyl ester has a side chain structure of 7 to 9 carbon atoms.
In addition, when the benzotriazole type UV absorber is used, the effect of absorbing ultraviolet rays by the UV-blocking optical adhesive after curing is better by adding the hydroxyphenyl triazine type UV absorber to the UV-blocking optical adhesive. In the embodiment of the invention, the ultraviolet absorber of hydroxyphenyl triazine is 0.1 to 2 parts by weight. Preferably, the ultraviolet absorbent of hydroxyphenyl triazine is 0.5 to 1.5 weight parts; more preferably, the amount of the hydroxyphenyltriazine ultraviolet absorber is 1 to 1.2 parts by weight. The preferable ratio is a preferable value obtained by combining self experience and creative work of the inventor, and the addition of the hydroxyphenyl triazine ultraviolet absorbent according to the preferable ratio can enable the UV-blocking optical adhesive after curing to have better effect of absorbing ultraviolet rays and lower transmittance. In this example, the ultraviolet light absorber of hydroxyphenyltriazine type may be selected from 2, 4-bis (2-hydroxy-4-butoxyphenyl) -6- (2, 4-dibutoxyphenyl) -1,3, 5-triazine, 2- (2, 4-dihydroxyphenyl) -4, 6-bis- (2, 4-dimethylphenyl) -1,3, 5-triazine, (2-ethylhexyl) -glycidic acid ester, 2, 4-bis [ 2-hydroxy-4-butoxyphenyl ] -6- (2, 4-dibutoxyphenyl) -1,3, 5-triazine, 2- [4- [ (2-hydroxy-3-tridecyloxypropyl) oxy ] 2-hydroxyphenyl ] -4, 6-bis (2, 4-dimethylphenyl) -1,3, 5-triazine, 2, 4-bis [ 2-hydroxy-4-butoxyphenyl ] -6- (2, 4-dibutoxyphenyl) -1,3, 5-triazine, 2- [4- [ (2-hydroxy-3-tridecyloxypropyl) oxy ] -2-hydroxyphenyl ] -4, 6-bis (2, 4-dimethylphenyl) -1,3, 5-triazine.
In the present embodiment, the photoinitiator is preferably 2,4, 6-trimethylbenzoylphenylphosphine and methyl benzoylformate. In other embodiments, the initiator may be selected from one of benzildimethyl ether, dialkoxyacetophenone, 1-hydroxycyclohexylphenylketone, 2-hydroxy-2-methyl-1-phenyl-1-propanone, 2-methyl-1- (4-methylthiophenyl) -2-morpholin-1-one, 2-phenylbenzyl-2-dimethylamine-1- (4-morpholinylphenyl) butanone, 2,4, 6-trimethylbenzoyldiphenylphosphine oxide, ethyl 2,4, 6-trimethylbenzoylphenylphosphonate, benzophenone, 4' -bis (diethylamino) benzophenone, 2-isopropylthioxanthone, ethyl 4-dimethylamino-benzoate, etc, Two or more.
Further, the UV-blocking optical adhesive also comprises 10-40 parts by weight of a tackifier. In embodiments of the invention, the tackifier is preferably a terpene phenol copolymer, which can increase the viscosity of the UV-blocking optical adhesive. In other embodiments, other materials may be selected for the tackifier.
It should be noted that, if necessary, a cross-linking agent may be added to the UV-blocking optical adhesive, and the cross-linking agent may be selected from multifunctional (meth) acrylates such as: 1, 4-butanediol (meth) acrylate, 1, 6-hexanediol (meth) acrylate, 1, 9-nonanediol (meth) acrylate, tripropylene glycol di (meth) acrylate, tricyclodecane dimethanol dimethacrylate, 1, 10-decanediol dimethacrylate, polyethylene glycol (200) dimethacrylate, polyethylene glycol (400) dimethacrylate, polyethylene glycol (meth) acrylate, trimethylolpropane tri (meth) acrylate, ditrimethylolpropane tetra (meth) acrylate, ethoxylated pentaerythritol tetra (meth) acrylate, dipentaerythritol hexa) acrylate, and the like.
In addition, a defoaming agent and other processing aids can be added into the UV-blocking optical adhesive provided by the embodiment of the invention, and the defoaming agent can be a polysiloxane-based aid.
The optical adhesive film provided by the embodiment of the invention comprises a cured product obtained by curing a UV blocking optical adhesive. After coating and attaching, the liquid UV-blocking optical adhesive is irradiated by ultraviolet rays of 200-420nm, and the liquid UV-blocking optical adhesive is cured, so that the optical adhesive film can be obtained. The coated and attached substrate is a PET release film treated by an organic silicon release agent. The optical adhesive film comprises the cured UV blocking optical adhesive, so that the optical adhesive film has low ultraviolet transmittance. The transmittance of the optical adhesive film is less than 5% in the wavelength range of 300-380 nm.
The invention also provides a touch screen which comprises a cured product obtained by curing the UV blocking optical adhesive, wherein the cured UV blocking optical adhesive has low ultraviolet transmittance, so that the touch screen also has a strong ultraviolet blocking effect.
The invention also provides a display, which utilizes a cured product obtained by curing the UV-blocking optical adhesive, most of common optical adhesives only contain acrylic ester and cannot block ultraviolet rays, and the long-term radiation of the ultraviolet rays can cause the aging of the display. The display comprises the cured UV blocking optical adhesive, and the cured UV blocking optical adhesive can better block ultraviolet rays, so that the display also has a stronger effect of blocking ultraviolet rays.
The features and properties of the present invention are described in further detail below with reference to examples.
Example 1
The UV blocking optical adhesive comprises the following components in parts by weight: 32.8 parts of acrylate prepolymer, 0.5 part of 2- (5-chloro-benzotriazolyl) -6-tert-butyl-p-cresol, 15 parts of 4-hydroxybutyl acrylate, 0.4 part of hydroxyphenyl triazine ultraviolet absorber, 0.9 part of 2,4, 6-trimethylbenzoylphenylphosphine, 0.9 part of methyl benzoylformate, 0.2 part of polysiloxane, 23 parts of lauryl acrylate, 18 parts of isobornyl acrylate and 8 parts of terpene phenol copolymer, wherein the average molecular weight of the acrylate prepolymer is 75000.
An optical adhesive film comprises a cured product obtained by curing the UV-blocking optical adhesive and a PET film.
A touch screen comprises a cured product obtained by curing the UV-blocking optical adhesive.
A display includes a cured product obtained by curing the UV-blocking optical adhesive.
Example 2
The UV blocking optical adhesive comprises the following components in parts by weight: 32.8 parts of acrylate prepolymer, 1.5 parts of 2- (5-chloro-benzotriazolyl) -6-tert-butyl-p-cresol, 13.6 parts of 4-hydroxybutyl acrylate, 1 part of hydroxyphenyl triazine ultraviolet absorbent, 0.9 part of 2,4, 6-trimethyl benzoyl phenyl phosphine, 0.9 part of methyl benzoylformate, 0.2 part of polysiloxane, 23 parts of lauryl acrylate, 18 parts of isobornyl acrylate and 8 parts of terpene phenol copolymer. The average molecular weight of the acrylate prepolymer was 75000.
An optical adhesive film comprises a cured product obtained by curing the UV-blocking optical adhesive and a PET film.
A touch screen comprises a cured product obtained by curing the UV-blocking optical adhesive.
A display includes a cured product obtained by curing the UV-blocking optical adhesive.
Example 3
The UV blocking optical adhesive comprises the following components in parts by weight: 10 parts of polyurethane prepolymer, 0.1 part of 2- (5-chloro-benzotriazolyl) -6-tert-butyl-p-cresol, 3 parts of 4-hydroxybutyl acrylate, 4 parts of isobornyl acrylate, 0.1 part of hydroxyphenyl triazine ultraviolet absorbent, 0.05 part of 2,4, 6-trimethylbenzoylphenylphosphine, 0.05 part of methyl benzoylformate, 0.3 part of polysiloxane, 3 parts of lauryl acrylate and 12 parts of terpene phenol copolymer. The average molecular weight of the polyurethane prepolymer was 25000.
An optical adhesive film comprises a cured product obtained by curing the UV-blocking optical adhesive and a PET film.
A touch screen comprises a cured product obtained by curing the UV-blocking optical adhesive.
A display includes a cured product obtained by curing the UV-blocking optical adhesive.
Example 4
The UV blocking optical adhesive comprises the following components in parts by weight: 15 parts of acrylate prepolymer, 0.3 part of 2- (5-chloro-benzotriazolyl) -6-tert-butyl-p-cresol, 8 parts of lauryl acrylate, 7 parts of 4-hydroxybutyl acrylate, 0.2 part of 2,4, 6-trimethylbenzoylphenylphosphine, 0.2 part of methyl benzoylformate, 0.3 part of polysiloxane, 5 parts of isobornyl acrylate and 15 parts of terpene-phenol copolymer. The average molecular weight of the acrylate prepolymer was 75000.
An optical adhesive film comprises a cured product obtained by curing the UV-blocking optical adhesive and a PET film.
A touch screen comprises a cured product obtained by curing the UV-blocking optical adhesive.
A display includes a cured product obtained by curing the UV-blocking optical adhesive.
Example 5
The UV blocking optical adhesive comprises the following components in parts by weight: 15 parts of acrylate prepolymer, 0.3 part of 2- (5-chloro-benzotriazolyl) -6-tert-butyl-p-cresol, 8 parts of lauryl acrylate, 7 parts of 4-hydroxybutyl acrylate, 0.5 part of hydroxyphenyl triazine ultraviolet absorbent, 0.2 part of 2,4, 6-trimethyl benzoyl phenyl phosphine, 0.2 part of methyl benzoylformate, 0.3 part of polysiloxane, 5 parts of isobornyl acrylate and 15 parts of terpene phenol copolymer. The average molecular weight of the acrylate prepolymer was 75000.
An optical adhesive film comprises a cured product obtained by curing the UV-blocking optical adhesive and a PET film.
A touch screen comprises a cured product obtained by curing the UV-blocking optical adhesive.
A display includes a cured product obtained by curing the UV-blocking optical adhesive.
Example 6
The UV blocking optical adhesive comprises the following components in parts by weight: 20 parts of acrylate prepolymer, 0.8 part of 2- (5-chloro-benzotriazolyl) -6-tert-butyl-p-cresol, 10 parts of 4-hydroxybutyl acrylate, 10 parts of isobornyl acrylate, 0.8 part of hydroxyphenyl triazine ultraviolet absorbent, 0.4 part of 2,4, 6-trimethylbenzoylphenylphosphine, 0.8 part of methyl benzoylformate, 0.2 part of polysiloxane, 10 parts of lauryl acrylate and 25 parts of terpene phenol copolymer. The average molecular weight of the acrylate prepolymer was 75000.
An optical adhesive film comprises a cured product obtained by curing the UV-blocking optical adhesive and a PET film.
A touch screen comprises a cured product obtained by curing the UV-blocking optical adhesive.
A display includes a cured product obtained by curing the UV-blocking optical adhesive.
Example 7
The UV blocking optical adhesive comprises the following components in parts by weight: 25 parts of acrylate prepolymer, 1 part of 2- (5-chloro-benzotriazolyl) -6-tert-butyl-p-cresol, 8 parts of 4-hydroxybutyl acrylate, 17 parts of isobornyl acrylate, 1.2 parts of hydroxyphenyl triazine ultraviolet absorbent, 0.6 part of 2,4, 6-trimethyl benzoyl phenyl phosphine, 0.9 part of methyl benzoylformate, 0.2 part of polysiloxane, 10 parts of lauryl acrylate and 30 parts of terpene phenol copolymer. The average molecular weight of the acrylate prepolymer was 75000.
An optical adhesive film comprises a cured product obtained by curing the UV-blocking optical adhesive and a PET film.
A touch screen comprises a cured product obtained by curing the UV-blocking optical adhesive.
A display includes a cured product obtained by curing the UV-blocking optical adhesive.
Example 8
The UV blocking optical adhesive comprises the following components in parts by weight: 30 parts of polyurethane prepolymer, 1.2 parts of 2- (5-chloro-benzotriazolyl) -6-tert-butyl-p-cresol, 10 parts of 4-hydroxybutyl acrylate, 20 parts of isobornyl acrylate, 1.5 parts of hydroxyphenyl triazine ultraviolet absorbent, 1 part of 2,4, 6-trimethylbenzoylphenylphosphine, 1.1 parts of methyl benzoylformate, 0.2 part of polysiloxane, 10 parts of lauryl acrylate and 20 parts of terpene phenol copolymer. The average molecular weight of the polyurethane prepolymer was 25000.
An optical adhesive film comprises a cured product obtained by curing the UV-blocking optical adhesive and a PET film.
A touch screen comprises a cured product obtained by curing the UV-blocking optical adhesive.
A display includes a cured product obtained by curing the UV-blocking optical adhesive.
Example 9
The UV blocking optical adhesive comprises the following components in parts by weight: 40 parts of acrylate prepolymer, 1.7 parts of 2- (5-chloro-benzotriazolyl) -6-tert-butyl-p-cresol, 15 parts of 4-hydroxybutyl acrylate, 20 parts of isobornyl acrylate, 1.8 parts of hydroxyphenyl triazine ultraviolet absorbent, 1 part of 2,4, 6-trimethylbenzoylphenylphosphine, 1.5 parts of methyl benzoylformate, 0.4 part of polysiloxane, 15 parts of lauryl acrylate and 35 parts of terpene phenol copolymer. The average molecular weight of the acrylate prepolymer was 75000.
An optical adhesive film comprises a cured product obtained by curing the UV-blocking optical adhesive and a PET film.
A touch screen comprises a cured product obtained by curing the UV-blocking optical adhesive.
A display includes a cured product obtained by curing the UV-blocking optical adhesive.
Example 10
The UV blocking optical adhesive comprises the following components in parts by weight: 50 parts of acrylate prepolymer, 2 parts of 2- (5-chloro-benzotriazolyl) -6-tert-butyl-p-cresol, 20 parts of 4-hydroxybutyl acrylate, 25 parts of isobornyl acrylate, 2 parts of hydroxyphenyl triazine ultraviolet absorbent, 1.5 parts of 2,4, 6-trimethylbenzoylphenylphosphine, 1.5 parts of methyl benzoylformate, 0.6 part of polysiloxane, 15 parts of lauryl acrylate and 40 parts of terpene-phenol copolymer. The average molecular weight of the acrylate prepolymer was 75000.
An optical adhesive film comprises a cured product obtained by curing the UV-blocking optical adhesive and a PET film.
A touch screen comprises a cured product obtained by curing the UV-blocking optical adhesive.
A display includes a cured product obtained by curing the UV-blocking optical adhesive.
Comparative example 1
The UV blocking optical adhesive comprises the following components in parts by weight: 32.8 parts of acrylate prepolymer, 0.09 part of 2- (5-chloro-benzotriazolyl) -6-tert-butyl-p-cresol, 15 parts of 4-hydroxybutyl acrylate, 0.4 part of hydroxyphenyl triazine ultraviolet absorber, 0.9 part of 2,4, 6-trimethyl benzoyl phenyl phosphine, 0.9 part of methyl benzoylformate, 0.2 part of polysiloxane, 23 parts of lauryl acrylate, 18 parts of isobornyl acrylate and 8 parts of terpene phenol copolymer. The average molecular weight of the acrylate prepolymer was 75000.
Comparative example 2
The UV blocking optical adhesive comprises the following components in parts by weight: 32.8 parts of acrylate prepolymer, 2.2 parts of 2- (5-chloro-benzotriazolyl) -6-tert-butyl-p-cresol, 15 parts of 4-hydroxybutyl acrylate, 0.4 part of hydroxyphenyl triazine ultraviolet absorber, 0.9 part of 2,4, 6-trimethyl benzoyl phenyl phosphine, 0.9 part of methyl benzoylformate, 0.2 part of polysiloxane, 23 parts of lauryl acrylate, 18 parts of isobornyl acrylate and 8 parts of terpene phenol copolymer. The average molecular weight of the acrylate prepolymer was 75000.
Comparative example 3
The UV blocking optical adhesive comprises the following components in parts by weight: 32.8 parts of acrylate prepolymer, 0.5 part of 2- (5-chloro-benzotriazolyl) -6-tert-butyl-p-cresol, 15 parts of 4-hydroxybutyl acrylate, 0.09 part of hydroxyphenyl triazine ultraviolet absorber, 0.9 part of 2,4, 6-trimethyl benzoyl phenyl phosphine, 0.9 part of methyl benzoylformate, 0.2 part of polysiloxane, 23 parts of lauryl acrylate, 18 parts of isobornyl acrylate and 8 parts of terpene phenol copolymer. The average molecular weight of the acrylate prepolymer was 75000.
Comparative example 4
The UV blocking optical adhesive comprises the following components in parts by weight: 32.8 parts of acrylate prepolymer, 0.5 part of 2- (5-chloro-benzotriazolyl) -6-tert-butyl-p-cresol, 15 parts of 4-hydroxybutyl acrylate, 2.2 parts of hydroxyphenyl triazine ultraviolet absorbent, 0.9 part of 2,4, 6-trimethyl benzoyl phenyl phosphine, 0.9 part of methyl benzoylformate, 0.2 part of polysiloxane, 23 parts of lauryl acrylate, 18 parts of isobornyl acrylate and 8 parts of terpene phenol copolymer. The average molecular weight of the acrylate prepolymer was 75000.
Comparative example 5
The UV blocking optical adhesive comprises the following components in parts by weight: 32.8 parts of acrylate prepolymer, 0.5 part of 2- (5-chloro-benzotriazolyl) -6-tert-butyl-p-cresol, 3 parts of 4-hydroxybutyl acrylate, 3 parts of isobornyl acrylate, 0.4 part of hydroxyphenyl triazine ultraviolet absorber, 0.9 part of 2,4, 6-trimethyl benzoyl phenyl phosphine, 0.9 part of methyl benzoylformate, 0.2 part of polysiloxane, 2 parts of lauryl acrylate and 8 parts of terpene phenol copolymer. The average molecular weight of the acrylate prepolymer was 75000.
Comparative example 6
The UV blocking optical adhesive comprises the following components in parts by weight: 32.8 parts of acrylate prepolymer, 0.5 part of 2- (5-chloro-benzotriazolyl) -6-tert-butyl-p-cresol, 15 parts of 4-hydroxybutyl acrylate, 30 parts of isobornyl acrylate, 0.4 part of hydroxyphenyl triazine ultraviolet absorber, 0.9 part of 2,4, 6-trimethylbenzoylphenylphosphine, 0.9 part of methyl benzoylformate, 0.2 part of polysiloxane, 17 parts of lauryl acrylate and 8 parts of terpene phenol copolymer. The average molecular weight of the acrylate prepolymer was 75000.
Comparative example 7
The UV blocking optical adhesive comprises the following components in parts by weight: 32.8 parts of acrylate prepolymer, 0.5 part of 2- (5-chloro-benzotriazolyl) -6-tert-butyl-p-cresol, 15 parts of 4-hydroxybutyl acrylate, 0.4 part of hydroxyphenyl triazine ultraviolet absorber, 0.03 part of 2,4, 6-trimethyl benzoyl phenyl phosphine, 0.05 part of methyl benzoylformate, 0.2 part of polysiloxane, 23 parts of lauryl acrylate, 18 parts of isobornyl acrylate and 8 parts of terpene phenol copolymer. The average molecular weight of the acrylate prepolymer was 75000.
Comparative example 8
The UV blocking optical adhesive comprises the following components in parts by weight: 32.8 parts of acrylate prepolymer, 0.5 part of 2- (5-chloro-benzotriazolyl) -6-tert-butyl-p-cresol, 15 parts of 4-hydroxybutyl acrylate, 0.4 part of hydroxyphenyl triazine ultraviolet absorber, 1 part of 2,4, 6-trimethyl benzoyl phenyl phosphine, 2.5 parts of methyl benzoylformate, 0.2 part of polysiloxane, 23 parts of lauryl acrylate, 18 parts of isobornyl acrylate and 8 parts of terpene phenol copolymer. The average molecular weight of the acrylate prepolymer was 75000.
Test examples
Preparation of experimental samples: the UV-blocking optical adhesive of examples 1 to 5 and comparative examples 1 to 8 were mixed and coated on a heavy release film, and a second light release film was attached to the coated layer. Under the ultraviolet illumination of 200mW/cm2The energy is 2000mJ/cm2The coating was irradiated with ultraviolet rays to form a cured UV-blocking optical adhesive having a double layer thickness of 100 μm. The thickness of the first release film is 38 μm, the thickness of the second release film is 75 μm, and the first and second release films are polyethylene terephthalate (PET) films and PETThe films were all first treated with a silicone release agent. The obtained cured UV blocking optical adhesive with release film was subjected to a 180 ° peel strength test, total light transmittance measurement and cure rate measurement, and the test results are recorded in table 1.
(1)180 degree peel strength test
The cured UV-blocking optical adhesive with release film was peeled off from the light release film to expose the adhesive face, a 50 μm thick untreated PET film was attached to the adhesive face, which was cut into a test piece 25mm wide, the heavy release film was peeled off from the test piece to expose the second adhesive face, and the 50 μm thick untreated PET film was attached to the second adhesive face with a 1kg weight press roll. Then, after being held at a temperature of 25 ℃ for one day, the peel strength of the PET film was measured under conditions of a stretching speed of 300mm/min and a peel angle of 180 ℃.
(2) Total light transmittance test
The light transmittance of the cured UV-blocking optical adhesive with a release liner was measured in a wavelength range of 300nm to 800nm using a spectrophotometer (V-660).
(3) Measurement of curing Rate
1) Experimental equipment
Fourier transform Infrared Spectroscopy (Spectrum TWO, PerKinElmer).
2) Conditions of the experiment
At 500cm-1-4000cm-1In a reflective mode.
3) Test object
A liquid UV-blocking optical adhesive (the UV-blocking optical adhesive is not cured after the components are mixed), and a cured UV-blocking optical adhesive.
4) Reaction rate calculation mode:
reaction rate (%) - (A)0-At)*100％；
In the formula, A0: peak intensity ratio of the liquid UV blocking optical adhesive;
At: peak intensity ratio of the cured UV blocking optical adhesive;
A0＝r0/r，At＝rt/r；
in the formula (I), the compound is shown in the specification,
r0: the peak value of the vinyl group of the liquid UV blocking optical adhesive;
rt: peak value of vinyl group of cured UV-blocking optical adhesive;
r: peak value of ester group.
(4) Overall performance
The 180 DEG peel strength is superior when being more than 7N/25mm, otherwise, the 180 DEG peel strength is poor; the transmittance under the conditions of the wavelengths of 300nm, 350nm and 380nm is respectively excellent when being less than 5 percent, otherwise, the transmittance is poor; cure rates greater than 90% are excellent, otherwise poor. If the score is three excellent, the comprehensive performance is excellent; if the scores are two excellent values and one poor value, the comprehensive performance is good; if the score is two or three poor, the overall score is poor.
Table 1 test results of UV-blocking optical adhesives of examples 1 to 5 and comparative examples 1 to 8
As can be seen from Table 1, the samples of examples 1-5 all had 180 ° peel strengths of greater than 7N/25mm, transmittances of less than 2% at wavelengths of 300nm, 350nm, and 380nm, respectively, and cure rates of greater than 90%. Therefore, the UV-blocking optical adhesives of examples 1-5 have good overall properties. The UV blocking optical adhesive and the preparation method thereof provided by the embodiment of the invention can be used for obtaining the UV blocking optical adhesive with high peeling strength, good ultraviolet blocking effect and excellent curing rate.
Comparing example 1 with comparative examples 1 and 2, it is found that although the 180 DEG peel strength of the sample of comparative example 1 is greater than 7N/25mm and the curing rate is greater than 90%, the transmittance under the conditions of 350nm and 380nm wavelength is greater than 5%; although the sample of comparative example 2 has less than 5% transmittance at wavelengths of 300nm, 350nm and 380nm, respectively, 180 ° peel strength is less than 7N/25mm and curing rate is less than 90%; therefore, the addition amount of the benzotriazole type UV absorber of the embodiment of the invention is demonstrated to be capable of preparing the UV-blocking optical adhesive with good comprehensive performance.
Comparing example 1 with comparative examples 3 and 4, it is found that although the 180 DEG peel strength of the sample of comparative example 3 is greater than 7N/25mm and the curing rate is greater than 90%, the transmittance under the conditions of 350nm and 380nm wavelength is greater than 5%; although the transmittance of the sample of comparative example 4 is less than 5% under the conditions of the wavelengths of 300nm, 350nm and 380nm, respectively, the 180 DEG peel strength is less than 7N/25mm, and the curing rate is less than 90%, which illustrates that the addition amount of the hydroxyphenyl triazine ultraviolet absorbent in the embodiment of the invention can prepare the UV-blocking optical adhesive with good comprehensive performance.
Comparing example 1 with comparative examples 5 and 6, it is found that, although the transmittance of the sample of comparative example 5 is less than 5%, the curing rate is greater than 90%, and the 180 ° peel strength is less than 7N/25mm under the conditions of 300nm, 350nm and 380nm wavelength, respectively; although the sample of comparative example 6 has a transmittance of less than 5% at wavelengths of 300nm, 350nm and 380nm, respectively, the curing rate is less than 90% and the 180 ° peel strength is less than 7N/25 mm. The addition amount of the acrylate monomer in the embodiment of the invention is shown to be capable of preparing the UV-blocking optical adhesive with good comprehensive performance.
Comparing example 1 with comparative example 7 and comparative example 8, the transmittance of the sample of comparative example 7 is more than 5%, the curing rate is less than 90%, and the 180 DEG peel strength is less than 7N/25mm under the conditions of the wavelengths of 350nm and 380nm respectively; the sample of comparative example 8 has a 180 ° peel strength of more than 7N/25mm, but has a transmittance of more than 5% and a curing rate of less than 90% at wavelengths of 350nm and 380nm, respectively. The addition amount of the photoinitiator in the embodiment of the invention can be used for preparing the UV-blocking optical adhesive with good comprehensive performance.
Comparing example 4 with example 5, it was found that example 4 was a UV-blocking optical adhesive without adding a hydroxyphenyl triazine ultraviolet absorber, and both the 180 ° peel strength and the curing rate were not very different, but the transmittance of the sample of example 4 was higher than that of the sample of example 5 under the conditions of the wavelengths of 300nm, 350nm, and 380nm, respectively, indicating that the addition of a hydroxyphenyl triazine ultraviolet absorber to a UV-blocking optical adhesive increases the blocking effect against ultraviolet rays.
In summary, in the UV-blocking optical adhesive, the optical adhesive film, the touch screen and the display according to the embodiments of the present invention, the UV-blocking optical adhesive is formed by curing a prepolymer as a base material, a benzotriazole-type UV absorber, a linear monomer and a photoinitiator under the action of ultraviolet light. The addition of 0.1 to 2 parts by weight of a benzotriazole-type UV absorber based on 10 to 50 parts by weight of the prepolymer can reduce its transmittance to ultraviolet rays. However, the addition of the benzotriazole type UV absorber can inhibit the curing of the prepolymer, the inhibition effect of the benzotriazole type UV absorber is reduced by adding 10-45 parts by weight of a monomer with a linear structure, and the UV-blocking optical adhesive has excellent curing rate and high peel strength.
The UV-blocking optical adhesive can be used for bonding two or more components, and can be coated on the surfaces of other components.
The UV-blocking optical adhesive can be cured to obtain a cured product. The cured product can be used for optical adhesive films and has low ultraviolet transmittance. In addition, the touch screen and the display provided by the invention have better blocking effect on ultraviolet rays due to the fact that the touch screen and the display contain the cured substance; and the display is not prone to aging.
The embodiments described above are some, but not all embodiments of the invention. The detailed description of the embodiments of the present invention is not intended to limit the scope of the invention as claimed, but is merely representative of selected embodiments of the invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Claims (16)
1. The UV blocking optical adhesive is characterized by comprising the following components in parts by weight: 10-50 parts of prepolymer, 20-60 parts of monomer, 0.5-1.5 parts of benzotriazole type UV absorbent, 0.1-3 parts of photoinitiator and 0.5-1.5 parts of hydroxyphenyl triazine ultraviolet absorbent, wherein the prepolymer comprises polyurethane prepolymer or acrylate prepolymer; the monomers are 4-hydroxybutyl acrylate, lauryl acrylate and isobornyl acrylate.
2. The UV-blocking optical adhesive according to claim 1, further comprising 8 to 40 parts by weight of a tackifier.
3. The UV-blocking optical adhesive according to claim 1, wherein the prepolymer has a linear structure.
4. The UV-blocking optical adhesive according to claim 1, wherein the benzotriazole-type UV absorber is 0.8 to 1.2 parts by weight.
5. The UV-blocking optical adhesive according to claim 1, wherein the substituent of the benzotriazole-type UV absorber has at least 4 carbon atoms.
6. The UV-blocking optical adhesive according to claim 5, wherein the benzotriazole-type UV absorber comprises 2- (5-chloro-benzotriazolyl) -6-o-tert-butyl-p-cresol, 3- (2-benzotriazol-2-yl) -5- (1, 1-hydroxyethyl) alkyl ester, 2- (5-chloro-2-benzotriazol-2-yl) -4-methyl-6-tert-butylphenol, 2- (2-benzotriazol-2-yl) -6- (1-methyl-1-phenylethyl) -4- (1,1,3,3-) phenol, 2- (2 '-hydroxy-5' -tert-octylphenyl) benzotriazole, 2-methyl-4-butyl-phenyl, 2,2 '-methylenebis (6- (benzotriazol-2-yl) -4-tert-octylphenol), 6- (2-benzotriazolyl) -4-tert-octyl-6-tert-butyl-4-methyl-2, 2' -methylenebisphenol, and trimethyl- (3- (2-benzotriazolyl) -5-tert-butyl-4-hydroxyphenyl) propionic acid.
7. The UV-blocking optical adhesive according to claim 1, wherein the monomer is 20 to 55 parts by weight.
8. The UV-blocking optical adhesive according to claim 7, wherein the monomer is 30 to 40 parts by weight.
9. The UV-blocking optical adhesive according to claim 1 or 7, wherein the monomer comprises an alkyl acrylate monomer.
10. The UV-blocking optical adhesive according to claim 9, wherein the alkyl group of the alkyl acrylate monomer has at least 6 carbon atoms.
11. The UV-blocking optical adhesive according to claim 1, wherein the hydroxyphenyltriazine-based ultraviolet absorber comprises at least one of 2, 4-bis (2-hydroxy-4-butoxyphenyl) -6- (2, 4-dibutoxyphenyl) -1,3, 5-triazine, 2- (2, 4-dihydroxyphenyl) -4, 6-bis- (2, 4-dimethylphenyl) -1,3, 5-triazine, and 2- [4- [ (2-hydroxy-3-tridecyloxypropyl) oxy ] -2-hydroxyphenyl ] -4, 6-bis (2, 4-dimethylphenyl) -1,3, 5-triazine.
12. The UV-blocking optical adhesive according to claim 1, wherein the initiator comprises methyl benzoylformate, benzildimethyl ether, dialkoxyacetophenone, 1-hydroxycyclohexylphenylketone, 2-hydroxy-2-methyl-1-phenyl-1-propanone, 2-methyl-1- (4-methylthiophenyl) -2-morpholine-1-one, 2-phenylbenzyl-2-dimethylamine-1- (4-morpholinobenzylphenyl) butanone, 2,4, 6-trimethylbenzoyldiphenylphosphine oxide, ethyl 2,4, 6-trimethylbenzoylphenylphosphonate, benzophenone, 4' -bis (diethylamino) benzophenone, 2-isopropylthioxanthone, bis (diethylamino) benzophenone, and the like, At least one of 4-dimethylamino-ethyl benzoate.
13. An optical adhesive film comprising a cured product obtained by curing the UV-blocking optical adhesive according to any one of claims 1 to 12.
14. The optical adhesive film of claim 13, wherein the transmittance of the optical adhesive film is less than 5% in the wavelength range of 300-380 nm.
15. A touch panel comprising a cured product obtained by curing the UV-blocking optical adhesive according to any one of claims 1 to 12.
16. A display comprising a cured product obtained by curing the UV-blocking optical adhesive according to any one of claims 1 to 12.
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| CN108441163B (en) * | 2018-03-15 | 2020-03-17 | 合肥微晶材料科技有限公司 | Optical adhesive applied to silver nanowire conductive film and preparation method thereof |
| CN112074543A (en) * | 2018-05-30 | 2020-12-11 | 三键有限公司 | Photocurable composition and cured product thereof |
| CN108958538A (en) * | 2018-06-28 | 2018-12-07 | 武汉华星光电半导体显示技术有限公司 | A kind of touch control electrode layer preparation method and touch control electrode layer |
| WO2020105256A1 (en) * | 2018-11-22 | 2020-05-28 | 三菱ケミカル株式会社 | Adhesive composition, adhesive, and adhesive sheet |
| CN112571880A (en) * | 2020-11-12 | 2021-03-30 | 苏州赛伍应用技术股份有限公司 | Electronic paper transparent plastic front panel and preparation method thereof |
| CN114292618A (en) * | 2022-01-13 | 2022-04-08 | 泰州亚德胶粘制品有限公司 | UV (ultraviolet) blocking optical adhesive and preparation method thereof |
| CN114456769B (en) * | 2022-03-10 | 2023-06-09 | 南通康尔乐复合材料有限公司 | UV-cured optical transparent adhesive suitable for full lamination of thick-frame liquid crystal display module and preparation method thereof |
| CN114989775A (en) * | 2022-06-08 | 2022-09-02 | 壹成理化合成材料(东莞)有限公司 | Ultraviolet curing adhesive with ultraviolet resistance function |
| CN115820170A (en) * | 2022-12-28 | 2023-03-21 | 苏州凡赛特材料科技有限公司 | Optical-grade transparent glue capable of blocking ultraviolet light and glue film thereof |
| CN115851111A (en) * | 2022-12-29 | 2023-03-28 | 宁波惠之星新材料科技股份有限公司 | Protective layer coating and protective film |
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