CN114806418A

CN114806418A - Preparation and application of OCA (optical clear adhesive) optical cement for touch screen

Info

Publication number: CN114806418A
Application number: CN202210354091.3A
Authority: CN
Inventors: 刘伟; 李彪
Original assignee: Guangdong Doneson New Materials Co ltd
Current assignee: Guangdong Doneson New Materials Co ltd
Priority date: 2022-04-06
Filing date: 2022-04-06
Publication date: 2022-07-29
Anticipated expiration: 2042-04-06
Also published as: CN114806418B

Abstract

The invention relates to the field of OCA (optical clear adhesive), and particularly discloses an OCA for a touch screen, a preparation method and an application thereof, wherein the OCA comprises the following components in parts by weight: 100 parts of acrylic resin; 5-10 parts of 4-tert-butyl cyclohexyl acrylate; 0.1-0.5 part of 1, 6-hexanediol diacrylate; 5-10 parts of isobornyl acrylate; 7-12 parts of hydroxyethyl acrylate; 0.1-0.5 part of tackifying resin; 0.5-2 parts of a light stabilizer; 0.1-0.5 part of antioxidant; 1.0-2.0 parts of a first photoinitiator; 0.1-0.5 part of second photoinitiator. Compared with the prior art, the invention adopts the ultraviolet polymerization technology to prepare the acrylic resin, has high curing speed, energy conservation, little pollution and excellent performance of cured products; the OCA optical adhesive provided by the invention is coated on a touch screen, and has the advantages of excellent comprehensive performance, high and stable adhesive film stripping force, high light transmittance, low haze, refractive index close to glass, no corrosion to the touch screen, no adhesive residue at constant temperature and humidity, no adhesive overflow, excellent yellowing resistance and the like.

Description

Preparation and application of OCA (optical clear adhesive) optical cement for touch screen

Technical Field

The invention relates to the technical field of OCA optical adhesive films, in particular to preparation and application of an OCA optical adhesive for a touch screen.

Background

In recent years, touch screens have been widely used in various industries. Touch Panel (Touch Panel), also called Touch screen or Touch Panel, is an inductive liquid crystal display device capable of receiving input signals such as Touch, when touching the graphic buttons on the screen, the Touch feedback system on the screen can drive various connecting devices according to a pre-programmed program, and can be used to replace the mechanical button Panel and produce vivid video and audio effects by the liquid crystal display picture. Indium Tin Oxide (ITO), also called Indium oxide, is a main material used for touch screens, and the working surface of the touch screen is an ITO coating. It is noteworthy that ITO coatings are susceptible to acid corrosion. When the touch screen is bonded with glass, the optical adhesive tape OCA is used for bonding, so that the OCA optical adhesive is required not to contain raw materials such as acid. In addition, the OCA optical adhesive for touch screens also needs to have the characteristics of high light transmittance, low haze, high and stable peeling force, excellent yellowing resistance and the like.

Fuhe Qing in Chinese patent CN 109627996B discloses a high-transmittance optical transparent adhesive for attaching a touch screen and a synthesis method thereof, and a preparation method of the high-transmittance optical transparent adhesive for attaching the touch screen is described in the patent. However, in the patent, the synthesis of the optical clear adhesive adopts a solution polymerization method, a large amount of solvent is added, a large amount of VOC is discharged in the process of preparing the OCA optical adhesive by thermosetting, and the solvent volatilization can pollute the environment.

Liuzhao Wei discloses an acid-free OCA optical adhesive, an adhesive tape and a preparation method thereof in Chinese patent CN 103031090A, and describes a preparation method of the acid-free OCA optical adhesive and the adhesive tape. The main resin acrylic adhesive used in the patent is purchased externally, and a specific synthesis process of the main resin acrylic adhesive is not described. In addition, the patent adopts thermal curing to prepare the acid-free OCA optical adhesive tape, and the used solvent can affect the environment.

Liutao in Chinese patent CN 108276950A discloses an acid-free system, high-weather-resistance and UV-cured OCA adhesive and a preparation method thereof, and describes a preparation method of an acid-free system, high-weather-resistance and UV-cured OCA adhesive, and a film prepared by using the adhesive has excellent bonding strength, holding power and haze. The method adopts a solution polymerization method to synthesize the resin, the process is complex, and in addition, the light transmittance of the OCA optical cement prepared in the patent is only 93.1-94.2% and needs to be improved.

At present, the development of an OCA optical adhesive for a touch screen is urgently needed, and the optical adhesive is required to have the advantages of simple production process, no pollution to the environment, excellent comprehensive performance of an adhesive film, high and stable stripping force, high light transmittance, low haze, no corrosion to the touch screen, no adhesive residue at constant temperature and humidity, no adhesive overflow, excellent yellowing resistance and the like.

Disclosure of Invention

The OCA optical adhesive for the touch screen is coated on the touch screen, has excellent comprehensive performance, high and stable adhesive film stripping force, high light transmittance and low haze, and has the advantages of no corrosion to the touch screen, no adhesive residue at constant temperature and humidity, no adhesive overflow and the like.

The invention adopts the technical scheme that OCA optical cement for a touch screen comprises the following raw materials in parts by weight:

100 parts of acrylic resin;

15-35 parts of reactive diluent

0.1-0.5 part of tackifying resin;

0.1-0.5 part of an auxiliary agent;

1.0-2.5 parts of a photoinitiator;

the molecular weight of the acrylic resin is 35-55 ten thousand, and the acrylic resin is formed by polymerizing a hard monomer, a soft monomer and a functional monomer; the weight part of the hard monomer is 5-10 parts, the weight part of the soft monomer is 65-90 parts, and the weight part of the functional monomer is 28-60 parts; the glass transition temperature of the hard monomer is 300-400K; the glass transition temperature of the soft monomer is 180-220K; the functional monomer comprises a hydroxyl-containing monomer, an epoxy-containing monomer, a naphthenic hydrocarbon-containing monomer and a heterocyclic ring-containing monomer; the reactive diluent comprises 4-tert-butylcyclohexyl acrylate, and the 4-tert-butylcyclohexyl acrylate accounts for 15-50% of the reactive diluent.

The invention provides an OCA optical adhesive for an acid-free photocuring touch screen, which is obtained by adding a reactive diluent comprising 4-tert-butylcyclohexyl acrylate, tackifying resin, a photoinitiator and an auxiliary agent into acrylic resin and uniformly stirring, wherein the acrylic resin is prepared by polymerizing a plurality of acrylate monomers, and the reactive diluent comprising 4-tert-butylcyclohexyl acrylate is combined to ensure that an adhesive film has good film forming property and water resistance and good adhesion to substrates difficult to adhere. The OCA optical adhesive provided by the invention has the advantages of simple production process, excellent comprehensive performance, high and stable adhesive film stripping force, high light transmittance, low haze, no corrosion to a touch screen, no adhesive residue, no adhesive overflow and the like, and is coated on the touch screen.

As a preferable technical scheme, the reactive diluent also comprises 1, 6-hexanediol diacrylate, isobornyl acrylate and hydroxyethyl acrylate.

As a preferred technical scheme, the OCA optical cement comprises the following raw materials in parts by weight:

100 parts of acrylic resin;

5-10 parts of 4-tert-butyl cyclohexyl acrylate;

0.1-0.5 part of 1, 6-hexanediol diacrylate;

5-10 parts of isobornyl acrylate;

7-12 parts of hydroxyethyl acrylate;

0.1-0.5 part of tackifying resin;

0.1-0.5 part of an auxiliary agent;

1.0-2.5 parts of a photoinitiator.

As a preferred technical solution, the hard monomer comprises one or more of vinyl acetate, methyl methacrylate, methyl acrylate, ethyl methacrylate, isopropyl methacrylate, isobutyl methacrylate, acrylonitrile and styrene; and/or the soft monomer is one or more of n-butyl acrylate, isooctyl acrylate and isodecyl acrylate; and/or, the hydroxyl group-containing monomer comprises one or more of hydroxyethyl methacrylate, hydroxyethyl acrylate, hydroxypropyl methacrylate, hydroxypropyl acrylate and hydroxybutyl acrylate; and/or, the epoxy-containing monomer comprises one or both of glycidyl methacrylate and glycidyl acrylate; and/or the monomer containing cycloalkane is one or two of isobornyl acrylate and isobornyl methacrylate; and/or the monomer containing the heterocycle comprises one or two of tetrahydrofuran acrylate and tetrahydrofuran methacrylate.

As a preferred technical solution, the functional monomers include tetrahydrofuran acrylate and glycidyl methacrylate; wherein the tetrahydrofuran acrylate accounts for 15.0-42% of the functional monomer, and the glycidyl methacrylate accounts for 18-46% of the functional monomer. According to the scheme, acrylic monomers with special functions such as glycidyl methacrylate and tetrahydrofuran acrylate are copolymerized to prepare the acrylic resin with excellent performance, and the OCA optical adhesive prepared from the acrylic resin has more excellent adherence to a touch screen and high and stable stripping force.

Preferably, the functional monomers further include hydroxypropyl acrylate, isobornyl acrylate, and hydroxyethyl acrylate; hydroxypropyl acrylate accounts for 3-26% of the functional monomer, isobornyl acrylate accounts for 10-36% of the functional monomer, and hydroxyethyl acrylate accounts for 3-26% of the functional monomer.

As a preferable technical scheme, the acrylic resin is prepared by reacting the following components in parts by weight:

5-10 parts of methyl methacrylate;

65-90 parts of isooctyl acrylate;

2-9 parts of hydroxypropyl acrylate;

8-14 parts of tetrahydrofuran acrylate;

2-9 parts of hydroxyethyl acrylate;

6-12 parts of isobornyl acrylate;

10-15 parts of glycidyl methacrylate;

0.5-2.0 parts of a third photoinitiator.

As a preferred technical solution, the preparation method of the acrylic resin comprises the following steps:

adding a hard monomer, a soft monomer, a functional monomer and a third photoinitiator into a reaction kettle, uniformly stirring, introducing nitrogen to remove oxygen, and then radiating and polymerizing by using ultraviolet light to obtain the acrylic resin.

Specifically, the preparation method of the acrylic resin specifically comprises the following steps:

a 1: adding a hard monomer, a soft monomer, a functional monomer and a third photoinitiator into a reaction kettle, and starting stirring;

a 2: after stirring evenly, introducing nitrogen to remove oxygen in the reaction kettle;

a 3: irradiating the raw materials in the reaction kettle by using an ultraviolet lamp, stirring at a constant speed, starting the polymerization reaction when the temperature of the raw materials in the reaction kettle rises, and turning off the ultraviolet lamp when the resin reaches the required molecular weight after the reaction to a certain degree to obtain the required acrylic resin.

According to the scheme, different acrylic monomers and photoinitiators are used as raw materials, ultraviolet light is used for irradiation polymerization, and the photoinitiators are excited to generate free radicals, so that the acrylic monomers are initiated to be polymerized to obtain the acrylic resin; the energy consumption is low, the production efficiency is high, and the method is suitable for industrial production; the prepared acrylic resin does not contain solvent, has no pollution to the environment and meets the requirements of national environmental protection policy.

Further preferably, the third photoinitiator comprises one or more of 1-hydroxycyclohexyl phenyl ketone, 2-hydroxy-2-methyl-1-phenyl-1-propanone and benzophenone in combination.

As a preferable technical scheme, the tackifying resin is one or a mixture of more of rosin, rosin derivatives, terpene resin, C5 petroleum resin, C9 petroleum resin and C5/C9 petroleum resin. Preferably, the tackifying resin is a derivative of rosin, more preferably, the tackifying resin is hydrogenated rosin.

As a preferred technical scheme, the auxiliary agent comprises a light stabilizer and an antioxidant. Preferably, the light stabilizer is 0.5-2.0 parts by weight, and the antioxidant is 0.1-0.5 part by weight.

More specifically, the light stabilizer comprises one or more combinations of Tinuvin1130, Tinuvin900, Tinuvin770, Tinuvin292, Tinuvin326, Tinuvin171, Tinuvin144 and Tinuvin 328; the antioxidant also comprises a mixture of one or more combinations of antioxidant 168, antioxidant 1010 and antioxidant 1076. Preferably, the light stabilizer is a mixture of Tinuvin1130 and Tinuvin292, and the antioxidant is a mixture of antioxidant 168 and antioxidant 1010.

As a preferred technical solution, the photoinitiator comprises a first photoinitiator and a second photoinitiator; the first photoinitiator comprises one or two of 1-hydroxycyclohexyl phenyl ketone and 2-hydroxy-2-methyl-1-phenyl-1-acetone; the second photoinitiator comprises one or two of 2,4, 6-trimethylbenzoyl phenyl phosphonic acid ethyl ester and 2,4, 6-trimethylbenzoyl diphenyl phosphine oxide.

The OCA optical cement prepared by the scheme is completely photocured and excellent in yellowing resistance.

A preparation method of OCA optical cement for a touch screen specifically comprises the following steps: weighing acrylic resin, reactive diluent, tackifying resin, auxiliary agent and photoinitiator according to the proportion, and stirring and mixing uniformly. The OCA optical cement for the touch screen provided by the invention is simple in preparation process, high in production efficiency and suitable for large-scale industrial production.

The application of the optical cement specifically comprises the following steps: and coating the OCA optical cement on a first heavy release film substrate, attaching a second light release film, and completely curing by ultraviolet irradiation. Specifically, the OCA optical adhesive is coated on a first layer of heavy release film, the dry adhesive is 50-200 um, and a second layer of light release film is attached, and the energy consumption is 800- ² And (5) irradiating by using an ultraviolet lamp for 1min for curing to obtain the OCA optical adhesive film.

An OCA optical film comprises the cured OCA optical cement. The optical film of the OCA may be applied to a touch screen. The optical film for the touch screen, which is prepared from the OCA optical adhesive provided by the invention, has the advantages of excellent comprehensive performance, high adhesive film stripping force, stability, high light transmittance, low haze, no corrosion to the touch screen, no adhesive residue at constant temperature and humidity, no adhesive overflow, excellent yellowing resistance and the like.

Compared with the prior art, the invention has the beneficial effects that:

(1) the acrylic resin is prepared by adopting an ultraviolet polymerization technology, has the characteristics of high curing speed, energy conservation, little pollution, excellent performance of cured products and the like, and is an environment-friendly green technology.

(2) The optical film for the touch screen, which is prepared from the OCA optical cement, has the advantages of high light transmittance, low haze, high bonding strength, high stripping force and stability; the adhesive does not remain and overflow under constant temperature and humidity, has excellent comprehensive performance and can be repeatedly re-pasted.

(3) The OCA optical adhesive prepared by the method does not contain acid, and does not corrode an ITO coating on a touch screen.

(4) The optical film for the touch screen, which is prepared from the OCA optical cement, has excellent yellowing resistance.

Drawings

Fig. 1 is a schematic structural diagram of an OCA optical adhesive film for a touch screen.

Reference numerals: 1. a first heavy release film; 2. an OCA optical adhesive film; 3. and a second light release film.

Detailed Description

The drawings are only for purposes of illustration and are not to be construed as limiting the invention. For a better understanding of the following embodiments, certain features of the drawings may be omitted, enlarged or reduced, and do not represent the size of an actual product; it will be understood by those skilled in the art that certain well-known structures in the drawings and descriptions thereof may be omitted.

Example 1

The embodiment provides a preparation method of an OCA optical cement for a touch screen, which is prepared from the following raw materials: 100g of acrylic resin; 4-tert-butylcyclohexyl acrylate (6.6 g); 0.3g of 1, 6-hexanediol diacrylate; isobornyl acrylate 8.2 g; 10.3g of hydroxyethyl acrylate; hydrogenated rosin was 0.2 g; light stabilizer 1130 was 0.3 g; light stabilizer 292 was 0.4 g; 0.1g of antioxidant 1010; antioxidant 168 was 0.2 g; 1.2g of a first photoinitiator, 2-hydroxy-2-methyl-1-phenyl-1-propanone; the second photoinitiator, 2,4, 6-trimethylbenzoyl-diphenylphosphine oxide, was 0.3 g.

The acrylic resin is prepared by reacting the following components: 7.6g of methyl methacrylate, 88.2g of isooctyl acrylate, 4.7g of hydroxypropyl acrylate, 10.2g of tetrahydrofuryl acrylate, 6.6g of hydroxyethyl acrylate, 8.5g of isobornyl acrylate, 10.8g of glycidyl methacrylate, 0.8g of 2-hydroxy-2-methyl-1-phenyl-1-propanone.

The synthesis process of the acrylic resin comprises the following steps:

(1) 7.6g of methyl methacrylate, 88.2g of isooctyl acrylate, 4.7g of hydroxypropyl acrylate, 10.2g of tetrahydrofuryl acrylate, 6.6g of hydroxyethyl acrylate, 8.5g of isobornyl acrylate, 10.8g of glycidyl methacrylate, 0.8g of 2-hydroxy-2-methyl-1-phenyl-1-propanone were charged into the reaction vessel.

(2) Introducing nitrogen to remove oxygen, and stirring for 30 min;

(3) and irradiating the mixed solution in the reaction kettle by using ultraviolet light, starting the polymerization reaction, turning off the ultraviolet lamp when the required molecular weight is reached after the reaction is carried out to a certain extent, stopping introducing nitrogen, and stopping the reaction to obtain the acrylic resin with the weight-average molecular weight of 42-43 ten thousand.

The embodiment provides an application method of an OCA optical cement for a touch screen, which comprises the following steps: 100g of acrylic resin, 6.6g of 4-tert-butylcyclohexyl acrylate, 0.3g of 1, 6-hexanediol diacrylate, 8.2g of isobornyl acrylate, 10.3g of hydroxyethyl acrylate, 0.2g of hydrogenated rosin, 0.3g of light stabilizer 1130, 0.4g of light stabilizer 292, 0.1g of antioxidant 1010, 0.2g of antioxidant 168, 1.2g of first photoinitiator 2-hydroxy-2-methyl-1-phenyl-1-acetone and 0.3g of second photoinitiator 2,4, 6-trimethylbenzoyl-diphenylphosphine oxide in the formula are mixed and stirred uniformly (the acid value of the mixed solution is 0.32 mgKOH/g), standing and defoaming are carried out, an automatic coating machine is used for coating 100 mu m thick dry glue on a PET substrate, a release film is attached, and the light-cured film is obtained by irradiating with ultraviolet light for 1 min.

Example 2

The acrylic resin is prepared by reacting the following components: 7.6g of methyl methacrylate, 88.2g of isooctyl acrylate, 4.7g of hydroxypropyl acrylate, 12.6g of tetrahydrofuryl acrylate, 6.6g of hydroxyethyl acrylate, 8.5g of isobornyl acrylate, 10.8g of glycidyl methacrylate, 0.8g of 2-hydroxy-2-methyl-1-phenyl-1-propanone.

The synthesis process of the acrylic resin comprises the following steps:

(1) 7.6g of methyl methacrylate, 88.2g of isooctyl acrylate, 4.7g of hydroxypropyl acrylate, 12.6g of tetrahydrofuryl acrylate, 6.6g of hydroxyethyl acrylate, 8.5g of isobornyl acrylate, 10.8g of glycidyl methacrylate, 0.8g of 2-hydroxy-2-methyl-1-phenyl-1-propanone were charged into the reaction vessel.

(2) Introducing nitrogen to remove oxygen, and stirring for 30 min;

(3) and irradiating the mixed solution in the reaction kettle by using ultraviolet light, starting the polymerization reaction, turning off the ultraviolet lamp when the required molecular weight is reached after the reaction is carried out to a certain extent, stopping introducing nitrogen, and stopping the reaction to obtain the acrylic resin with the weight-average molecular weight of 43-44 ten thousand.

The embodiment provides an application method of an OCA optical cement for a touch screen, which comprises the following steps: 100g of acrylic resin, 6.6g of 4-tert-butylcyclohexyl acrylate, 0.3g of 1, 6-hexanediol diacrylate, 8.2g of isobornyl acrylate, 10.3g of hydroxyethyl acrylate, 0.2g of hydrogenated rosin, 0.3g of light stabilizer 1130, 0.4g of light stabilizer 292, 0.1g of antioxidant 1010, 0.2g of antioxidant 168, 1.2g of first photoinitiator 2-hydroxy-2-methyl-1-phenyl-1-acetone and 0.3g of second photoinitiator 2,4, 6-trimethylbenzoyl-diphenylphosphine oxide in the formula are mixed and stirred uniformly (the acid value of the mixed solution is 0.38 mgKOH/g), standing and defoaming are carried out, an automatic coating machine is used for coating 100 mu m thick dry glue on a PET substrate, a release film is attached, and the light-cured film is obtained by irradiating with ultraviolet light for 1 min.

Example 3

The acrylic resin is prepared by reacting the following components: 7.6g of methyl methacrylate, 88.2g of isooctyl acrylate, 4.7g of hydroxypropyl acrylate, 14.0g of tetrahydrofuryl acrylate, 6.6g of hydroxyethyl acrylate, 8.5g of isobornyl acrylate, 12.5g of glycidyl methacrylate, 0.8g of 2-hydroxy-2-methyl-1-phenyl-1-propanone.

The synthesis process of the acrylic resin comprises the following steps:

(1) 7.6g of methyl methacrylate, 88.2g of isooctyl acrylate, 4.7g of hydroxypropyl acrylate, 14.0g of tetrahydrofuryl acrylate, 6.6g of hydroxyethyl acrylate, 8.5g of isobornyl acrylate, 10.8g of glycidyl methacrylate, 0.8g of 2-hydroxy-2-methyl-1-phenyl-1-propanone were charged into the reaction vessel.

(2) Introducing nitrogen to remove oxygen, and stirring for 30 min;

(3) and irradiating the mixed solution in the reaction kettle by using ultraviolet light, starting polymerization reaction, turning off the ultraviolet lamp when the required molecular weight is reached after the reaction is carried out to a certain extent, stopping introducing nitrogen, and stopping the reaction to obtain the acrylic resin with the weight-average molecular weight of 44-45 ten thousand.

The embodiment provides an application method of an OCA optical cement for a touch screen, which comprises the following steps: 100g of acrylic resin, 6.6g of 4-tert-butylcyclohexyl acrylate, 0.3g of 1, 6-hexanediol diacrylate, 8.2g of isobornyl acrylate, 10.3g of hydroxyethyl acrylate, 0.2g of hydrogenated rosin, 0.3g of light stabilizer 1130, 0.4g of light stabilizer 292, 0.1g of antioxidant 1010, 0.2g of antioxidant 168, 1.2g of first photoinitiator 2-hydroxy-2-methyl-1-phenyl-1-acetone and 0.3g of second photoinitiator 2,4, 6-trimethylbenzoyl-diphenylphosphine oxide in the formula are mixed and stirred uniformly (the acid value of the mixed solution is 0.43 mgKOH/g), standing and defoaming are carried out, an automatic coating machine is used for coating 100 mu m thick dry glue on a PET substrate, a release film is attached, and the light-cured film is obtained by irradiating with ultraviolet light for 1 min.

Example 4

The acrylic resin is prepared by reacting the following components: 7.6g of methyl methacrylate, 88.2g of isooctyl acrylate, 4.7g of hydroxypropyl acrylate, 10.2g of tetrahydrofuryl acrylate, 6.6g of hydroxyethyl acrylate, 8.5g of isobornyl acrylate, 13.1g of glycidyl methacrylate, 0.8g of 2-hydroxy-2-methyl-1-phenyl-1-propanone.

The synthesis process of the acrylic resin comprises the following steps:

(1) 7.6g of methyl methacrylate, 88.2g of isooctyl acrylate, 4.7g of hydroxypropyl acrylate, 10.2g of tetrahydrofuran acrylate, 6.6g of hydroxyethyl acrylate, 8.5g of isobornyl acrylate, 13.1g of glycidyl methacrylate, and 0.8g of 2-hydroxy-2-methyl-1-phenyl-1-propanone were charged into the reaction vessel.

(2) Introducing nitrogen to remove oxygen, and stirring for 30 min;

(3) and irradiating the mixed solution in the reaction kettle by using ultraviolet light, starting polymerization reaction, turning off the ultraviolet lamp when the required molecular weight is reached after the reaction is carried out to a certain extent, stopping introducing nitrogen, and stopping the reaction to obtain the acrylic resin with the weight-average molecular weight of 45-46 ten thousand.

The embodiment provides an application method of an OCA optical cement for a touch screen, which comprises the following steps: 100g of acrylic resin, 6.6g of 4-tert-butylcyclohexyl acrylate, 0.3g of 1, 6-hexanediol diacrylate, 8.2g of isobornyl acrylate, 10.3g of hydroxyethyl acrylate, 0.2g of hydrogenated rosin, 0.3g of light stabilizer 1130, 0.4g of light stabilizer 292, 0.1g of antioxidant 1010, 0.2g of antioxidant 168, 1.2g of first photoinitiator 2-hydroxy-2-methyl-1-phenyl-1-acetone and 0.3g of second photoinitiator 2,4, 6-trimethylbenzoyl-diphenylphosphine oxide in the formula are mixed and stirred uniformly (the acid value of the mixed solution is 0.51 mgKOH/g), standing and defoaming are carried out, an automatic coating machine is used for coating 100 mu m thick dry glue on a PET substrate, a release film is attached, and the light-cured film is obtained by irradiating with ultraviolet light for 1 min.

Example 5

The acrylic resin is prepared by reacting the following components: 7.6g of methyl methacrylate, 88.2g of isooctyl acrylate, 4.7g of hydroxypropyl acrylate, 10.2g of tetrahydrofuryl acrylate, 6.6g of hydroxyethyl acrylate, 8.5g of isobornyl acrylate, 15.0g of glycidyl methacrylate, 0.8g of 2-hydroxy-2-methyl-1-phenyl-1-propanone.

The synthesis process of the acrylic resin comprises the following steps:

(1) 7.6g of methyl methacrylate, 88.2g of isooctyl acrylate, 4.7g of hydroxypropyl acrylate, 10.2g of tetrahydrofuran acrylate, 6.6g of hydroxyethyl acrylate, 8.5g of isobornyl acrylate, 15.0g of glycidyl methacrylate, and 0.8g of 2-hydroxy-2-methyl-1-phenyl-1-propanone were charged into the reaction vessel.

(2) Introducing nitrogen to remove oxygen, and stirring for 30 min;

(3) and irradiating the mixed solution in the reaction kettle by using ultraviolet light, starting the polymerization reaction, turning off the ultraviolet lamp when the required molecular weight is reached after the reaction is carried out to a certain extent, stopping introducing nitrogen, and stopping the reaction to obtain the acrylic resin with the weight-average molecular weight of 47-48 ten thousand.

The embodiment provides an application method of an OCA optical cement for a touch screen, which comprises the following steps: 100g of acrylic resin, 6.6g of 4-tert-butylcyclohexyl acrylate, 0.3g of 1, 6-hexanediol diacrylate, 8.2g of isobornyl acrylate, 10.3g of hydroxyethyl acrylate, 0.2g of hydrogenated rosin, 0.3g of light stabilizer 1130, 0.4g of light stabilizer 292, 0.1g of antioxidant 1010, 0.2g of antioxidant 168, 1.2g of first photoinitiator 2-hydroxy-2-methyl-1-phenyl-1-acetone and 0.3g of second photoinitiator 2,4, 6-trimethylbenzoyl-diphenylphosphine oxide in the formula are mixed and stirred uniformly (the acid value of the mixed solution is 0.39 mgKOH/g), standing and defoaming are carried out, an automatic coating machine is used for coating 100 mu m thick dry glue on a PET substrate, a release film is attached, and the light-cured film is obtained by irradiating with ultraviolet light for 1 min.

Example 6

The embodiment provides a preparation method of an OCA optical cement for a touch screen, which is prepared from the following raw materials: 100g of acrylic resin; 4-tert-butylcyclohexyl acrylate (5.1 g); 0.3g of 1, 6-hexanediol diacrylate; isobornyl acrylate 8.2 g; 10.3g of hydroxyethyl acrylate; hydrogenated rosin was 0.2 g; light stabilizer 1130 was 0.3 g; light stabilizer 292 was 0.4 g; 0.1g of antioxidant 1010; antioxidant 168 was 0.2 g; 1.2g of a first photoinitiator, 2-hydroxy-2-methyl-1-phenyl-1-propanone; the second photoinitiator, 2,4, 6-trimethylbenzoyl-diphenylphosphine oxide, was 0.3 g.

The synthesis process of the acrylic resin comprises the following steps:

(2) Introducing nitrogen to remove oxygen, and stirring for 30 min;

The embodiment provides an application method of OCA optical cement for a touch screen, which comprises the following steps: 100g of acrylic resin, 5.1g of 4-tert-butylcyclohexyl acrylate, 0.3g of 1, 6-hexanediol diacrylate, 8.2g of isobornyl acrylate, 10.3g of hydroxyethyl acrylate, 0.2g of hydrogenated rosin, 0.3g of light stabilizer 1130, 0.4g of light stabilizer 292, 0.1g of antioxidant 1010, 0.2g of antioxidant 168, 1.2g of first photoinitiator 2-hydroxy-2-methyl-1-phenyl-1-acetone and 0.3g of second photoinitiator 2,4, 6-trimethylbenzoyl-diphenylphosphine oxide in the formula are mixed and stirred uniformly (the acid value of the mixed solution is 0.47 mgKOH/g), standing and defoaming are carried out, an automatic coating machine is used for coating 100 mu m thick dry glue on a PET substrate, a release film is attached, and the light-cured film is obtained by irradiating with ultraviolet light for 1 min.

Example 7

The embodiment provides a preparation method of an OCA optical cement for a touch screen, which is prepared from the following raw materials: 100g of acrylic resin; 4-tert-butylcyclohexyl acrylate (8.5 g); 0.3g of 1, 6-hexanediol diacrylate; isobornyl acrylate 8.2 g; 10.3g of hydroxyethyl acrylate; hydrogenated rosin was 0.2 g; light stabilizer 1130 was 0.3 g; light stabilizer 292 was 0.4 g; 0.1g of antioxidant 1010; antioxidant 168 was 0.2 g; 1.2g of a first photoinitiator, 2-hydroxy-2-methyl-1-phenyl-1-propanone; the second photoinitiator, 2,4, 6-trimethylbenzoyl-diphenylphosphine oxide, was 0.3 g.

The acrylic resin is prepared by reacting the following components: 7.6g of methyl methacrylate, 88.2g of isooctyl acrylate, 4.7g of hydroxypropyl acrylate, 10.2g of tetrahydrofuran acrylate, 6.6g of hydroxyethyl acrylate, 8.5g of isobornyl acrylate, 10.8g of glycidyl methacrylate and 0.8g of 2-hydroxy-2-methyl-1-phenyl-1-propanone.

The synthesis process of the acrylic resin comprises the following steps:

(2) Introducing nitrogen to remove oxygen, and stirring for 30 min;

The embodiment provides an application method of an OCA optical cement for a touch screen, which comprises the following steps: 100g of acrylic resin, 8.5g of 4-tert-butylcyclohexyl acrylate, 0.3g of 1, 6-hexanediol diacrylate, 8.2g of isobornyl acrylate, 10.3g of hydroxyethyl acrylate, 0.2g of hydrogenated rosin, 0.3g of light stabilizer 1130, 0.4g of light stabilizer 292, 0.1g of antioxidant 1010, 0.2g of antioxidant 168, 1.2g of first photoinitiator 2-hydroxy-2-methyl-1-phenyl-1-acetone and 0.3g of second photoinitiator 2,4, 6-trimethylbenzoyl-diphenylphosphine oxide in the formula are mixed and stirred uniformly (the acid value of the mixed solution is 0.42 mgKOH/g), standing and defoaming are carried out, an automatic coating machine is used for coating 100 mu m thick dry glue on a PET substrate, a release film is attached, and the light-cured film is obtained by irradiating with ultraviolet light for 1 min.

Example 8

The embodiment provides a preparation method of an OCA optical cement for a touch screen, which is prepared from the following raw materials: 100g of acrylic resin; 4-t-butylcyclohexyl acrylate (10.0 g); 0.3g of 1, 6-hexanediol diacrylate; isobornyl acrylate 8.2 g; 10.3g of hydroxyethyl acrylate; hydrogenated rosin was 0.2 g; light stabilizer 1130 was 0.3 g; light stabilizer 292 was 0.4 g; 0.1g of antioxidant 1010; antioxidant 168 was 0.2 g; 1.2g of a first photoinitiator, 2-hydroxy-2-methyl-1-phenyl-1-propanone; the second photoinitiator, 2,4, 6-trimethylbenzoyl-diphenylphosphine oxide, was 0.3 g.

The synthesis process of the acrylic resin comprises the following steps:

(2) Introducing nitrogen to remove oxygen, and stirring for 30 min;

The embodiment provides an application method of an OCA optical cement for a touch screen, which comprises the following steps: 100g of acrylic resin, 10.0g of 4-tert-butylcyclohexyl acrylate, 0.3g of 1, 6-hexanediol diacrylate, 8.2g of isobornyl acrylate, 10.3g of hydroxyethyl acrylate, 0.2g of hydrogenated rosin, 0.3g of light stabilizer 1130, 0.4g of light stabilizer 292, 0.1g of antioxidant 1010, 0.2g of antioxidant 168, 1.2g of first photoinitiator 2-hydroxy-2-methyl-1-phenyl-1-acetone and 0.3g of second photoinitiator 2,4, 6-trimethylbenzoyl-diphenylphosphine oxide in the formula are mixed and stirred uniformly (the acid value of the mixed solution is 0.36 mgKOH/g), standing and defoaming are carried out, an automatic coating machine is used for coating 100 mu m thick dry glue on a PET substrate, a release film is attached, and the light-cured film is obtained by irradiating with ultraviolet light for 1 min.

Example 9

The embodiment provides a preparation method of an OCA optical cement for a touch screen, which is prepared from the following raw materials: 100g of acrylic resin; 4-tert-butylcyclohexyl acrylate (6.6 g); 0.3g of 1, 6-hexanediol diacrylate; isobornyl acrylate 8.2 g; 10.3g of hydroxyethyl acrylate; hydrogenated rosin was 0.2 g; light stabilizer 1130 was 0.8 g; light stabilizer 292 was 0.6 g; 0.1g of antioxidant 1010; antioxidant 168 was 0.2 g; 1.2g of a first photoinitiator, 2-hydroxy-2-methyl-1-phenyl-1-propanone; the second photoinitiator, 2,4, 6-trimethylbenzoyl-diphenylphosphine oxide, was 0.3 g.

The synthesis process of the acrylic resin comprises the following steps:

(2) Introducing nitrogen to remove oxygen, and stirring for 30 min;

The embodiment provides an application method of an OCA optical cement for a touch screen, which comprises the following steps: 100g of acrylic resin, 6.6g of 4-tert-butylcyclohexyl acrylate, 0.3g of 1, 6-hexanediol diacrylate, 8.2g of isobornyl acrylate, 10.3g of hydroxyethyl acrylate, 0.2g of hydrogenated rosin, 0.8g of light stabilizer 1130, 0.6g of light stabilizer 292, 0.1g of antioxidant 1010, 0.2g of antioxidant 168, 1.2g of first photoinitiator 2-hydroxy-2-methyl-1-phenyl-1-acetone and 0.3g of second photoinitiator 2,4, 6-trimethylbenzoyl-diphenylphosphine oxide in the formula are mixed and stirred uniformly (the acid value of the mixed solution is 0.56 mgKOH/g), standing and defoaming are carried out, an automatic coating machine is used for coating 100 mu m thick dry glue on a PET substrate, a release film is attached, and the light-cured film is obtained by irradiating with ultraviolet light for 1 min.

Example 10

The embodiment provides a preparation method of an OCA optical cement for a touch screen, which is prepared from the following raw materials: 100g of acrylic resin; 4-tert-butylcyclohexyl acrylate 6.6 g; 0.3g of 1, 6-hexanediol diacrylate; isobornyl acrylate 8.2 g; 10.3g of hydroxyethyl acrylate; hydrogenated rosin was 0.2 g; light stabilizer 1130 was 1.1 g; light stabilizer 292 was 0.8 g; 0.1g of antioxidant 1010; antioxidant 168 was 0.2 g; 1.2g of a first photoinitiator, 2-hydroxy-2-methyl-1-phenyl-1-propanone; the second photoinitiator, 2,4, 6-trimethylbenzoyl-diphenylphosphine oxide, was 0.3 g.

The synthesis process of the acrylic resin comprises the following steps:

(2) Introducing nitrogen to remove oxygen, and stirring for 30 min;

The embodiment provides an application method of an OCA optical cement for a touch screen, which comprises the following steps: 100g of acrylic resin, 6.6g of 4-tert-butylcyclohexyl acrylate, 0.3g of 1, 6-hexanediol diacrylate, 8.2g of isobornyl acrylate, 10.3g of hydroxyethyl acrylate, 0.2g of hydrogenated rosin, 1.1 of light stabilizer 1130, 0.8g of light stabilizer 292, 0.1g of antioxidant 1010, 0.2g of antioxidant 168, 1.2g of first photoinitiator 2-hydroxy-2-methyl-1-phenyl-1-acetone and 0.3g of second photoinitiator 2,4, 6-trimethylbenzoyl-diphenylphosphine oxide in the formula are mixed and stirred uniformly (the acid value of the mixed solution is 0.35 mgKOH/g), standing and defoaming are carried out, an automatic coating machine is used for coating 100 mu m thick dry glue on a PET substrate, a release film is attached, and the light-cured film is obtained by irradiating with ultraviolet light for 1 min.

Example 11

The embodiment provides a preparation method of an OCA optical cement for a touch screen, which is prepared from the following raw materials: 100g of acrylic resin; 4-tert-butylcyclohexyl acrylate (6.6 g); 0.3g of 1, 6-hexanediol diacrylate; isobornyl acrylate 8.2 g; 10.3g of hydroxyethyl acrylate; hydrogenated rosin was 0.2 g; light stabilizer 1130 is 0.3 g; light stabilizer 292 was 0.4 g; 0.2g of antioxidant 1010; antioxidant 168 was 0.2 g; 1.2g of a first photoinitiator, 2-hydroxy-2-methyl-1-phenyl-1-propanone; the second photoinitiator, 2,4, 6-trimethylbenzoyl-diphenylphosphine oxide, was 0.3 g.

The synthesis process of the acrylic resin comprises the following steps:

(2) Introducing nitrogen to remove oxygen, and stirring for 30 min;

(3) and irradiating the mixed solution in the reaction kettle by using ultraviolet light, starting the polymerization reaction, turning off the ultraviolet lamp when the required molecular weight is reached after the reaction reaches a certain degree, stopping introducing nitrogen, and stopping the reaction to obtain the acrylic resin with the weight-average molecular weight of 42-43 ten thousand.

The embodiment provides an application method of an OCA optical cement for a touch screen, which comprises the following steps: 100g of acrylic resin, 6.6g of 4-tert-butylcyclohexyl acrylate, 0.3g of 1, 6-hexanediol diacrylate, 8.2g of isobornyl acrylate, 10.3g of hydroxyethyl acrylate, 0.2g of hydrogenated rosin, 0.3g of light stabilizer 1130, 0.4g of light stabilizer 292, 0.2g of antioxidant 1010, 0.2g of antioxidant 168, 1.2g of first photoinitiator 2-hydroxy-2-methyl-1-phenyl-1-acetone and 0.3g of second photoinitiator 2,4, 6-trimethylbenzoyl-diphenylphosphine oxide in the formula are mixed and stirred uniformly (the acid value of the mixed solution is 0.48 mgKOH/g), standing and defoaming are carried out, an automatic coating machine is used for coating 100 mu m thick dry glue on a PET substrate, a release film is attached, and the light-cured film is obtained by irradiating with ultraviolet light for 1 min.

Example 12

The embodiment provides a preparation method of an OCA optical cement for a touch screen, which is prepared from the following raw materials: 100g of acrylic resin; 4-tert-butylcyclohexyl acrylate (6.6 g); 0.3g of 1, 6-hexanediol diacrylate; isobornyl acrylate 8.2 g; 10.3g of hydroxyethyl acrylate; hydrogenated rosin was 0.2 g; light stabilizer 1130 is 0.3 g; light stabilizer 292 was 0.4 g; 0.2g of antioxidant 1010; antioxidant 168 was 0.3 g; 1.2g of a first photoinitiator, 2-hydroxy-2-methyl-1-phenyl-1-propanone; the second photoinitiator, 2,4, 6-trimethylbenzoyl-diphenylphosphine oxide, was 0.3 g.

The synthesis process of the acrylic resin comprises the following steps:

(2) Introducing nitrogen to remove oxygen, and stirring for 30 min;

The embodiment provides an application method of an OCA optical cement for a touch screen, which comprises the following steps: 100g of acrylic resin, 6.6g of 4-tert-butylcyclohexyl acrylate, 0.3g of 1, 6-hexanediol diacrylate, 8.2g of isobornyl acrylate, 10.3g of hydroxyethyl acrylate, 0.2g of hydrogenated rosin, 0.3g of light stabilizer 1130, 0.4g of light stabilizer 292, 0.2g of antioxidant 1010, 0.3g of antioxidant 168, 1.2g of first photoinitiator 2-hydroxy-2-methyl-1-phenyl-1-acetone and 0.3g of second photoinitiator 2,4, 6-trimethylbenzoyl-diphenylphosphine oxide in the formula are mixed and stirred uniformly (the acid value of the mixed solution is 0.52 mgKOH/g), standing and defoaming are carried out, an automatic coating machine is used for coating 100 mu m thick dry glue on a PET substrate, a release film is attached, and the light-cured film is obtained by irradiating with ultraviolet light for 1 min.

Example 13

The embodiment provides a preparation method of an OCA optical cement for a touch screen, which is prepared from the following raw materials: 100g of acrylic resin; 4-tert-butylcyclohexyl acrylate (6.6 g); 0.3g of 1, 6-hexanediol diacrylate; isobornyl acrylate 8.2 g; 10.3g of hydroxyethyl acrylate; hydrogenated rosin was 0.2 g; light stabilizer 1130 was 0.3 g; light stabilizer 292 was 0.4 g; 0.1g of antioxidant 1010; antioxidant 168 was 0.2 g; 1.2g of a first photoinitiator, 2-hydroxy-2-methyl-1-phenyl-1-propanone; the second photoinitiator, 2,4, 6-trimethylbenzoyl-diphenylphosphine oxide, was 0.1 g.

The synthesis process of the acrylic resin comprises the following steps:

(2) Introducing nitrogen to remove oxygen, and stirring for 30 min;

The embodiment provides an application method of an OCA optical cement for a touch screen, which comprises the following steps: 100g of acrylic resin, 6.6g of 4-tert-butylcyclohexyl acrylate, 0.3g of 1, 6-hexanediol diacrylate, 8.2g of isobornyl acrylate, 10.3g of hydroxyethyl acrylate, 0.2g of hydrogenated rosin, 0.3g of light stabilizer 1130, 0.4g of light stabilizer 292, 0.1g of antioxidant 1010, 0.2g of antioxidant 168, 1.2g of first photoinitiator 2-hydroxy-2-methyl-1-phenyl-1-acetone and 0.1g of second photoinitiator 2,4, 6-trimethylbenzoyl-diphenylphosphine oxide in the formula are mixed and stirred uniformly (the acid value of the mixed solution is 0.42 mgKOH/g), standing and defoaming are carried out, an automatic coating machine is used for coating 100 mu m thick dry glue on a PET substrate, a release film is attached, and the light-cured film is obtained by irradiating with ultraviolet light for 1 min.

Example 14

The embodiment provides a preparation method of an OCA optical cement for a touch screen, which is prepared from the following raw materials: 100g of acrylic resin; 4-tert-butylcyclohexyl acrylate (6.6 g); 0.3g of 1, 6-hexanediol diacrylate; isobornyl acrylate 8.2 g; 10.3g of hydroxyethyl acrylate; hydrogenated rosin was 0.2 g; light stabilizer 1130 was 0.3 g; light stabilizer 292 was 0.4 g; 0.1g of antioxidant 1010; antioxidant 168 was 0.2 g; 1.2g of a first photoinitiator, 2-hydroxy-2-methyl-1-phenyl-1-propanone; the second photoinitiator, 2,4, 6-trimethylbenzoyl-diphenylphosphine oxide, was 0.5 g.

The synthesis process of the acrylic resin comprises the following steps:

(2) Introducing nitrogen to remove oxygen, and stirring for 30 min;

The embodiment provides an application method of an OCA optical cement for a touch screen, which comprises the following steps: 100g of acrylic resin, 6.6g of 4-tert-butylcyclohexyl acrylate, 0.3g of 1, 6-hexanediol diacrylate, 8.2g of isobornyl acrylate, 10.3g of hydroxyethyl acrylate, 0.2g of hydrogenated rosin, 0.3g of light stabilizer 1130, 0.4g of light stabilizer 292, 0.1g of antioxidant 1010, 0.2g of antioxidant 168, 1.2g of first photoinitiator 2-hydroxy-2-methyl-1-phenyl-1-acetone and 0.5g of second photoinitiator 2,4, 6-trimethylbenzoyl-diphenylphosphine oxide in the formula are mixed and stirred uniformly (the acid value of the mixed solution is 0.34 mgKOH/g), standing and defoaming are carried out, an automatic coating machine is used for coating 100 mu m thick dry glue on a PET substrate, a release film is attached, and the light-cured film is obtained by irradiating with ultraviolet light for 1 min.

Comparative example 1

The acrylic resin is prepared by reacting the following components: 7.6g of methyl methacrylate, 88.2g of isooctyl acrylate, 4.7g of hydroxypropyl acrylate, 5.7g of tetrahydrofuryl acrylate, 6.6g of hydroxyethyl acrylate, 8.5g of isobornyl acrylate, 10.8g of glycidyl methacrylate, 0.8g of 2-hydroxy-2-methyl-1-phenyl-1-propanone.

The synthesis process of the acrylic resin comprises the following steps:

(1) 7.6g of methyl methacrylate, 88.2g of isooctyl acrylate, 4.7g of hydroxypropyl acrylate, 5.7g of tetrahydrofuryl acrylate, 6.6g of hydroxyethyl acrylate, 8.5g of isobornyl acrylate, 10.8g of glycidyl methacrylate, 0.8g of 2-hydroxy-2-methyl-1-phenyl-1-propanone were charged into the reaction vessel.

(2) Introducing nitrogen to remove oxygen, and stirring for 30 min;

The embodiment provides an application method of an OCA optical cement for a touch screen, which comprises the following steps: 100g of acrylic resin, 6.6g of 4-tert-butylcyclohexyl acrylate, 0.3g of 1, 6-hexanediol diacrylate, 8.2g of isobornyl acrylate, 10.3g of hydroxyethyl acrylate, 0.2g of hydrogenated rosin, 0.3g of light stabilizer 1130, 0.4g of light stabilizer 292, 0.1g of antioxidant 1010, 0.2g of antioxidant 168, 1.2g of first photoinitiator 2-hydroxy-2-methyl-1-phenyl-1-acetone and 0.3g of second photoinitiator 2,4, 6-trimethylbenzoyl-diphenylphosphine oxide in the formula are mixed and stirred uniformly (the acid value of the mixed solution is 0.47 mgKOH/g), standing and defoaming are carried out, an automatic coating machine is used for coating 100 mu m thick dry glue on a PET substrate, a release film is attached, and the light-cured film is obtained by irradiating with ultraviolet light for 1 min.

Comparative example 2

The acrylic resin is prepared by reacting the following components: 7.6g of methyl methacrylate, 88.2g of isooctyl acrylate, 4.7g of hydroxypropyl acrylate, 10.2g of tetrahydrofuryl acrylate, 6.6g of hydroxyethyl acrylate, 8.5g of isobornyl acrylate, 15.8g of glycidyl methacrylate, 0.8g of 2-hydroxy-2-methyl-1-phenyl-1-propanone.

The synthesis process of the acrylic resin comprises the following steps:

(1) 7.6g of methyl methacrylate, 88.2g of isooctyl acrylate, 4.7g of hydroxypropyl acrylate, 10.2g of tetrahydrofuran acrylate, 6.6g of hydroxyethyl acrylate, 8.5g of isobornyl acrylate, 15.8g of glycidyl methacrylate, and 0.8g of 2-hydroxy-2-methyl-1-phenyl-1-propanone were charged into the reaction vessel.

(2) Introducing nitrogen to remove oxygen, and stirring for 30 min;

The embodiment provides an application method of OCA optical cement for a touch screen, which comprises the following steps: 100g of acrylic resin, 6.6g of 4-tert-butylcyclohexyl acrylate, 0.3g of 1, 6-hexanediol diacrylate, 8.2g of isobornyl acrylate, 10.3g of hydroxyethyl acrylate, 0.2g of hydrogenated rosin, 0.3g of light stabilizer 1130, 0.4g of light stabilizer 292, 0.1g of antioxidant 1010, 0.2g of antioxidant 168, 1.2g of first photoinitiator 2-hydroxy-2-methyl-1-phenyl-1-acetone and 0.3g of second photoinitiator 2,4, 6-trimethylbenzoyl-diphenylphosphine oxide in the formula are mixed and stirred uniformly (the acid value of the mixed solution is 0.39 mgKOH/g), standing and defoaming are carried out, an automatic coating machine is used for coating 100 mu m thick dry glue on a PET substrate, a release film is attached, and the light-cured film is obtained by irradiating with ultraviolet light for 1 min.

Comparative example 3

The embodiment provides a preparation method of an OCA optical cement for a touch screen, which is prepared from the following raw materials: 100g of acrylic resin; 4-tert-butylcyclohexyl acrylate (11.2 g); 0.3g of 1, 6-hexanediol diacrylate; isobornyl acrylate 8.2 g; 10.3g of hydroxyethyl acrylate; hydrogenated rosin was 0.2 g; light stabilizer 1130 was 0.3 g; light stabilizer 292 was 0.4 g; 0.1g of antioxidant 1010; antioxidant 168 was 0.2 g; 1.2g of a first photoinitiator, 2-hydroxy-2-methyl-1-phenyl-1-propanone; the second photoinitiator, 2,4, 6-trimethylbenzoyl-diphenylphosphine oxide, was 0.3 g.

The synthesis process of the acrylic resin comprises the following steps:

(2) Introducing nitrogen to remove oxygen, and stirring for 30 min;

(3) and irradiating the mixed solution in the reaction kettle by using ultraviolet light, starting the polymerization reaction, turning off the ultraviolet lamp when the required molecular weight is reached after the reaction reaches a certain degree, stopping introducing nitrogen, and stopping the reaction to obtain the acrylic resin with the weight-average molecular weight of 25-26 ten thousand.

The embodiment provides an application method of an OCA optical cement for a touch screen, which comprises the following steps: 100g of acrylic resin, 11.2g of 4-tert-butylcyclohexyl acrylate, 0.3g of 1, 6-hexanediol diacrylate, 8.2g of isobornyl acrylate, 10.3g of hydroxyethyl acrylate, 0.2g of hydrogenated rosin, 0.3g of light stabilizer 1130, 0.4g of light stabilizer 292, 0.1g of antioxidant 1010, 0.2g of antioxidant 168, 1.2g of first photoinitiator 2-hydroxy-2-methyl-1-phenyl-1-acetone and 0.3g of second photoinitiator 2,4, 6-trimethylbenzoyl-diphenylphosphine oxide in the formula are mixed and stirred uniformly (the acid value of the mixed solution is 0.41 mgKOH/g), standing and defoaming are carried out, an automatic coating machine is used for coating 100 mu m thick dry glue on a PET substrate, a release film is attached, and the light-cured film is obtained by irradiating with ultraviolet light for 1 min.

Comparative example 4

The embodiment provides a preparation method of an OCA optical cement for a touch screen, which is prepared from the following raw materials: 100g of acrylic resin; 4-tert-butylcyclohexyl acrylate (6.6 g); 0.3g of 1, 6-hexanediol diacrylate; isobornyl acrylate 8.2 g; 10.3g of hydroxyethyl acrylate; hydrogenated rosin was 0.2 g; light stabilizer 1130 was 1.3 g; light stabilizer 292 was 0.9 g; 0.1g of antioxidant 1010; antioxidant 168 was 0.2 g; 1.2g of a first photoinitiator, 2-hydroxy-2-methyl-1-phenyl-1-propanone; the second photoinitiator 2,4, 6-trimethylbenzoyl-diphenylphosphine oxide was 0.3 g.

The synthesis process of the acrylic resin comprises the following steps:

(1) 7.6g of methyl methacrylate, 88.2g of isooctyl acrylate, 4.7g of hydroxypropyl acrylate, 10.2g of tetrahydrofuran acrylate, 6.6g of hydroxyethyl acrylate, 8.5g of isobornyl acrylate, 10.8g of glycidyl methacrylate and 0.8g of 2-hydroxy-2-methyl-1-phenyl-1-propanone were charged in the reaction vessel.

(2) Introducing nitrogen to remove oxygen, and stirring for 30 min;

The embodiment provides an application method of OCA optical cement for a touch screen, which comprises the following steps: 100g of acrylic resin, 6.6g of 4-tert-butylcyclohexyl acrylate, 0.3g of 1, 6-hexanediol diacrylate, 8.2g of isobornyl acrylate, 10.3g of hydroxyethyl acrylate, 0.2g of hydrogenated rosin, 1.3g of light stabilizer 1130, 0.9g of light stabilizer 292, 0.1g of antioxidant 1010, 0.2g of antioxidant 168, 1.2g of first photoinitiator 2-hydroxy-2-methyl-1-phenyl-1-acetone and 0.3g of second photoinitiator 2,4, 6-trimethylbenzoyl-diphenylphosphine oxide in the formula are mixed and stirred uniformly (the acid value of the mixed solution is 0.35 mgKOH/g), standing and defoaming are carried out, an automatic coating machine is used for coating 100 mu m thick dry glue on a PET substrate, a release film is attached, and the light-cured film is obtained by irradiating with ultraviolet light for 1 min.

Comparative example 5

The embodiment provides a preparation method of an OCA optical cement for a touch screen, which is prepared from the following raw materials: 100g of acrylic resin; 4-tert-butylcyclohexyl acrylate (6.6 g); 0.3g of 1, 6-hexanediol diacrylate; isobornyl acrylate 8.2 g; 10.3g of hydroxyethyl acrylate; 0.2g of hydrogenated rosin; light stabilizer 1130 was 0.3 g; light stabilizer 292 was 0.4 g; 0.4g of antioxidant 1010; antioxidant 168 was 0.3 g; 1.2g of a first photoinitiator, 2-hydroxy-2-methyl-1-phenyl-1-propanone; the second photoinitiator, 2,4, 6-trimethylbenzoyl-diphenylphosphine oxide, was 0.3 g.

The synthesis process of the acrylic resin comprises the following steps:

(2) Introducing nitrogen to remove oxygen, and stirring for 30 min;

The embodiment provides an application method of an OCA optical cement for a touch screen, which comprises the following steps: 100g of acrylic resin, 6.6g of 4-tert-butylcyclohexyl acrylate, 0.3g of 1, 6-hexanediol diacrylate, 8.2g of isobornyl acrylate, 10.3g of hydroxyethyl acrylate, 0.2g of hydrogenated rosin, 0.3g of light stabilizer 1130, 0.4g of light stabilizer 292, 0.4g of antioxidant 1010, 0.3g of antioxidant 168, 1.2g of first photoinitiator 2-hydroxy-2-methyl-1-phenyl-1-acetone and 0.3g of second photoinitiator 2,4, 6-trimethylbenzoyl-diphenylphosphine oxide in the formula are mixed and stirred uniformly (the acid value of the mixed solution is 0.36 mgKOH/g), standing and defoaming are carried out, an automatic coating machine is used for coating 100 mu m thick dry glue on a PET substrate, a release film is attached, and the light-cured film is obtained by irradiating with ultraviolet light for 1 min.

Comparative example 6

The embodiment provides a preparation method of an OCA optical cement for a touch screen, which is prepared from the following raw materials: 100g of acrylic resin; 4-tert-butylcyclohexyl acrylate (6.6 g); 0.3g of 1, 6-hexanediol diacrylate; isobornyl acrylate 8.2 g; 10.3g of hydroxyethyl acrylate; hydrogenated rosin was 0.2 g; light stabilizer 1130 was 0.3 g; light stabilizer 292 was 0.4 g; 0.1g of antioxidant 1010; antioxidant 168 was 0.2 g; the second photoinitiator, 2,4, 6-trimethylbenzoyl-diphenylphosphine oxide, was 0.6 g.

The synthesis process of the acrylic resin comprises the following steps:

(2) Introducing nitrogen to remove oxygen, and stirring for 30 min;

The embodiment provides an application method of an OCA optical cement for a touch screen, which comprises the following steps: 100g of acrylic resin, 6.6g of 4-tert-butylcyclohexyl acrylate, 0.3g of 1, 6-hexanediol diacrylate, 8.2g of isobornyl acrylate, 10.3g of hydroxyethyl acrylate, 0.2g of hydrogenated rosin, 0.3g of light stabilizer 1130, 0.4g of light stabilizer 292, 0.1g of antioxidant 1010, 0.2g of antioxidant 168 and 0.6g of second photoinitiator 2,4, 6-trimethylbenzoyl-diphenylphosphine oxide in the formula are mixed and stirred uniformly (the acid value of the mixed solution is 0.41 mgKOH/g), the mixture is kept still for defoaming, an automatic coating machine is used for coating dry glue with the thickness of 100um on a PET substrate, a release film is attached, and the light curing film is obtained by irradiating the mixture for 1min by ultraviolet light.

Comparative example 7

The acrylic resin is prepared by reacting the following components: 7.6g of methyl methacrylate, 88.2g of isooctyl acrylate, 4.7g of hydroxypropyl acrylate, 6.6g of hydroxyethyl acrylate, 8.5g of isobornyl acrylate, 10.8g of glycidyl methacrylate and 0.8g of 2-hydroxy-2-methyl-1-phenyl-1-propanone.

The synthesis process of the acrylic resin comprises the following steps:

(1) 7.6g of methyl methacrylate, 88.2g of isooctyl acrylate, 4.7g of hydroxypropyl acrylate, 6.6g of hydroxyethyl acrylate, 8.5g of isobornyl acrylate, 10.8g of glycidyl methacrylate and 0.8g of 2-hydroxy-2-methyl-1-phenyl-1-propanone were charged into the reaction vessel.

(2) Introducing nitrogen to remove oxygen, and stirring for 30 min;

(3) and irradiating the mixed solution in the reaction kettle by using ultraviolet light, starting the polymerization reaction, turning off the ultraviolet lamp when the required molecular weight is reached after the reaction is carried out to a certain extent, stopping introducing nitrogen, and stopping the reaction to obtain the acrylic resin with the weight-average molecular weight of 37-38 ten thousand.

The embodiment provides an application method of an OCA optical cement for a touch screen, which comprises the following steps: 100g of acrylic resin, 6.6g of 4-tert-butylcyclohexyl acrylate, 0.3g of 1, 6-hexanediol diacrylate, 8.2g of isobornyl acrylate, 10.3g of hydroxyethyl acrylate, 0.2g of hydrogenated rosin, 0.3g of light stabilizer 1130, 0.4g of light stabilizer 292, 0.1g of antioxidant 1010, 0.2g of antioxidant 168, 1.2g of first photoinitiator 2-hydroxy-2-methyl-1-phenyl-1-acetone and 0.3g of second photoinitiator 2,4, 6-trimethylbenzoyl-diphenylphosphine oxide in the formula are mixed and stirred uniformly (the acid value of the mixed solution is 0.45 mgKOH/g), standing and defoaming are carried out, an automatic coating machine is used for coating 100 mu m thick dry glue on a PET substrate, a release film is attached, and the light-cured film is obtained by irradiating with ultraviolet light for 1 min.

Comparative example 8

The acrylic resin is prepared by reacting the following components: 7.6g of methyl methacrylate, 88.2g of isooctyl acrylate, 4.7g of hydroxypropyl acrylate, 10.2g of tetrahydrofurfuryl acrylate, 6.6g of hydroxyethyl acrylate, 8.5g of isobornyl acrylate, 0.8g of 2-hydroxy-2-methyl-1-phenyl-1-propanone.

The synthesis process of the acrylic resin comprises the following steps:

(1) 7.6g of methyl methacrylate, 88.2g of isooctyl acrylate, 4.7g of hydroxypropyl acrylate, 10.2g of tetrahydrofuryl acrylate, 6.6g of hydroxyethyl acrylate, 8.5g of isobornyl acrylate, 0.8g of 2-hydroxy-2-methyl-1-phenyl-1-propanone were charged into the reaction vessel.

(2) Introducing nitrogen to remove oxygen, and stirring for 30 min;

(3) and irradiating the mixed solution in the reaction kettle by using ultraviolet light, starting the polymerization reaction, turning off the ultraviolet lamp when the required molecular weight is reached after the reaction is carried out to a certain extent, stopping introducing nitrogen, and stopping the reaction to obtain the acrylic resin with the weight-average molecular weight of 35-36 ten thousand.

The embodiment provides an application method of an OCA optical cement for a touch screen, which comprises the following steps: 100g of acrylic resin, 6.6g of 4-tert-butylcyclohexyl acrylate, 0.3g of 1, 6-hexanediol diacrylate, 8.2g of isobornyl acrylate, 10.3g of hydroxyethyl acrylate, 0.2g of hydrogenated rosin, 0.3g of light stabilizer 1130, 0.4g of light stabilizer 292, 0.1g of antioxidant 1010, 0.2g of antioxidant 168, 1.2g of first photoinitiator 2-hydroxy-2-methyl-1-phenyl-1-acetone and 0.3g of second photoinitiator 2,4, 6-trimethylbenzoyl-diphenylphosphine oxide in the formula are mixed and stirred uniformly (the acid value of the mixed solution is 0.31 mgKOH/g), standing and defoaming are carried out, an automatic coating machine is used for coating 100 mu m thick dry glue on a PET substrate, a release film is attached, and the light-cured film is obtained by irradiating with ultraviolet light for 1 min.

Comparative example 9

The embodiment provides a preparation method of an OCA optical cement for a touch screen, which is prepared from the following raw materials: 100g of acrylic resin; 4-tert-butylcyclohexyl acrylate (6.6 g); 0.3g of 1, 6-hexanediol diacrylate; isobornyl acrylate 8.2 g; 10.3g of hydroxyethyl acrylate; hydrogenated rosin was 0.2 g; 0.1g of antioxidant 1010; antioxidant 168 was 0.2 g; 1.2g of a first photoinitiator, 2-hydroxy-2-methyl-1-phenyl-1-propanone; the second photoinitiator, 2,4, 6-trimethylbenzoyl-diphenylphosphine oxide, was 0.3 g.

The synthesis process of the acrylic resin comprises the following steps:

(2) Introducing nitrogen to remove oxygen, and stirring for 30 min;

The embodiment provides an application method of an OCA optical cement for a touch screen, which comprises the following steps: 100g of acrylic resin, 6.6g of 4-tert-butylcyclohexyl acrylate, 0.3g of 1, 6-hexanediol diacrylate, 8.2g of isobornyl acrylate, 10.3g of hydroxyethyl acrylate, 0.2g of hydrogenated rosin, 0.1g of antioxidant 1010, 0.2g of antioxidant 168, 1.2g of a first photoinitiator, 2-hydroxy-2-methyl-1-phenyl-1-propanone and 0.3g of a second photoinitiator, 2,4, 6-trimethylbenzoyl-diphenylphosphine oxide in the formula are mixed and stirred uniformly (the acid value of the mixed solution is 0.36 mgKOH/g), the mixture is kept stand for defoaming, an automatic coating machine is used for coating dry glue with the thickness of 100um on a PET substrate, a release film is attached, and the light curing film is obtained by irradiating the dry glue for 1min by using ultraviolet light.

Comparative example 10

The embodiment provides a preparation method of an OCA optical cement for a touch screen, which is prepared from the following raw materials: 100g of acrylic resin; 0.3g of 1, 6-hexanediol diacrylate; isobornyl acrylate 8.2 g; 10.3g of hydroxyethyl acrylate; hydrogenated rosin was 0.2 g; light stabilizer 1130 was 0.3; light stabilizer 292 was 0.4 g; 0.1g of antioxidant 1010; antioxidant 168 was 0.2 g; 1.2g of a first photoinitiator, 2-hydroxy-2-methyl-1-phenyl-1-propanone; the second photoinitiator, 2,4, 6-trimethylbenzoyl-diphenylphosphine oxide, was 0.3 g.

The synthesis process of the acrylic resin comprises the following steps:

(2) Introducing nitrogen to remove oxygen, and stirring for 30 min;

The embodiment provides an application method of an OCA optical cement for a touch screen, which comprises the following steps: 100g of acrylic resin, 0.3g of 1, 6-hexanediol diacrylate, 8.2g of isobornyl acrylate, 10.3g of hydroxyethyl acrylate, 0.2g of hydrogenated rosin, 0.3g of light stabilizer 1130, 0.4g of light stabilizer 292, 0.1g of antioxidant 1010, 0.2g of antioxidant 168, 1.2g of first photoinitiator 2-hydroxy-2-methyl-1-phenyl-1-acetone and 0.3g of second photoinitiator 2,4, 6-trimethylbenzoyl-diphenylphosphine oxide in the formula are mixed and stirred uniformly (the acid value of the mixed solution is 0.46 mgKOH/g), standing is carried out for defoaming, an automatic coating machine is used for coating dry glue with the thickness of 100u on a PET substrate, a release film is attached, and the light curing film is obtained by irradiating for 1min by using ultraviolet light.

Comparative example 11

The embodiment provides a preparation method of an OCA optical cement for a touch screen, which is prepared from the following raw materials: the weight of acrylic resin is 100 g; 4-tert-butylcyclohexyl acrylate (6.6 g); 0.3g of 1, 6-hexanediol diacrylate; isobornyl acrylate 8.2 g; 10.3g of hydroxyethyl acrylate; hydrogenated rosin was 0.2 g; light stabilizer 1130 was 0.3 g; light stabilizer 292 was 0.4 g; 0.1g of antioxidant 1010; antioxidant 168 was 0.2 g; the first photoinitiator, 2-hydroxy-2-methyl-1-phenyl-1-propanone, was 1.2 g.

The synthesis process of the acrylic resin comprises the following steps:

(2) Introducing nitrogen to remove oxygen, and stirring for 30 min;

The embodiment provides an application method of an OCA optical cement for a touch screen, which comprises the following steps: 100g of acrylic resin, 6.6g of 4-tert-butylcyclohexyl acrylate, 0.3g of 1, 6-hexanediol diacrylate, 8.2g of isobornyl acrylate, 10.3g of hydroxyethyl acrylate, 0.2g of hydrogenated rosin, 0.3g of light stabilizer 1130, 0.4g of light stabilizer 292, 0.1g of antioxidant 1010, 0.2g of antioxidant 168 and 1.2g of first photoinitiator 2-hydroxy-2-methyl-1-phenyl-1-acetone in the formula are mixed and stirred uniformly (the acid value of the mixed solution is 0.40 mgKOH/g), the mixture is kept stand for defoaming, an automatic coating machine is used for coating dry glue with the thickness of 100um on a PET substrate, a release film is attached, and the light curing film is obtained by irradiating the dry glue for 1min by using ultraviolet light.

Comparative example 12

The embodiment provides a preparation method of an OCA optical cement for a touch screen, which is prepared from the following raw materials: 100g of acrylic resin; 4-tert-butylcyclohexyl acrylate (6.6 g); 0.3g of 1, 6-hexanediol diacrylate; isobornyl acrylate 8.2 g; 10.3g of hydroxyethyl acrylate; hydrogenated rosin was 0.2 g; light stabilizer 1130 was 0.3 g; light stabilizer 292 was 0.4 g; 0.1g of antioxidant 1010; antioxidant 168 was 0.2 g; 1.2g of a first photoinitiator, 2-hydroxy-2-methyl-1-phenyl-1-propanone; the second photoinitiator, 2,4, 6-trimethylbenzoyl-diphenylphosphine oxide, was 0.6 g.

The synthesis process of the acrylic resin comprises the following steps:

(2) Introducing nitrogen to remove oxygen, and stirring for 30 min;

The embodiment provides an application method of an OCA optical cement for a touch screen, which comprises the following steps: 100g of acrylic resin, 6.6g of 4-tert-butylcyclohexyl acrylate, 0.3g of 1, 6-hexanediol diacrylate, 8.2g of isobornyl acrylate, 10.3g of hydroxyethyl acrylate, 0.2g of hydrogenated rosin, 0.3g of light stabilizer 1130, 0.4g of light stabilizer 292, 0.1g of antioxidant 1010, 0.2g of antioxidant 168, 1.2g of first photoinitiator 2-hydroxy-2-methyl-1-phenyl-1-acetone and 0.6g of second photoinitiator 2,4, 6-trimethylbenzoyl-diphenylphosphine oxide in the formula are mixed and stirred uniformly (the acid value of the mixed solution is 0.36 mgKOH/g), standing and defoaming are carried out, an automatic coating machine is used for coating 100 mu m thick dry glue on a PET substrate, a release film is attached, and the light-cured film is obtained by irradiating with ultraviolet light for 1 min.

Performance testing

The performance test of the photocured films obtained by curing the OCA optical cement for the touch screen provided in the embodiments 1-14 and the comparative examples 1-12 is carried out, and the test standards and methods are as follows:

light transmittance and haze: testing according to ASTM D1003;

and (3) hardness measurement: testing according to a test method of a Shore durometer;

and (3) measuring the peeling force: testing according to GB 2792-81;

acid value measurement: test with reference to GB 4852-84;

determination of refractive index: reference GB/T40293-2021 test;

and (3) constant temperature and humidity determination: test reference GB/T10586-1989, test for 3 days;

and (3) measuring the aging resistance: reference to GB/T14522-;

and (3) measuring a yellowing value: testing was performed according to ASTM D2244. The performance of the sample is tested after the sample is placed in a BGD 856 standard type fluorescence ultraviolet aging box (refer to GB/T14522-;

the test results are shown in table 1.

TABLE 1 Properties of OCA optical adhesives for touch panels synthesized in examples 1 to 14 and comparative examples 1 to 12

Table 1 shows that, by comparing the test results of example 1, example 2, example 3 and comparative example 1, the peeling force of the adhesive film increases with the increase of the tetrahydrofuran acrylate, mainly because the tetrahydrofuran acrylate has good adhesion to most substrates, and if no or little tetrahydrofuran acrylate is added, the adhesive strength becomes low, and the peeling force is low; by comparing the test results of example 1, example 4, example 5 and comparative example 2, it can be seen that the adhesive strength increases with the increase of the addition amount of glycidyl methacrylate, and the peeling force also increases, mainly because glycidyl methacrylate is a functional acrylic monomer, and the weather resistance and the adhesive strength are good, and if the addition amount is insufficient or excessive, the phenomenon that the peeling force of the protective film is low and unstable also occurs; by comparing the test results of example 1, example 6, example 7, example 8, comparative example 5 and comparative example 10, it can be seen that the addition or the exceeding of the dosage range of the 4-tert-butylcyclohexyl acrylate can affect the comprehensive performance of the adhesive film, because the functional monomer 4-tert-butylcyclohexyl acrylate has good film forming property, water resistance and good adhesion to the substrate difficult to adhere, but the addition of too much of the functional monomer can cause the adhesive film to have higher toughness, which can affect the application of the adhesive film; by comparing the test results of example 1, example 9, example 10, comparative example 4 and comparative example 9, it can be seen that the aging resistance of the adhesive film is affected if the addition amount of the light stabilizer is too large or not, and the situation that the adhesive residue occurs in the constant temperature and humidity adhesive film if the addition amount is too large; by comparing the test results of example 1, example 11, example 12 and comparative example 5, it can be seen that the excessive addition of the antioxidant can affect incomplete photo-curing reaction and affect the comprehensive performance of the adhesive film; as can be seen from the test results of comparative example 1, comparative example 6 and comparative example 11, only the first photoinitiator and the second photoinitiator synergistically act to achieve a good initiation effect because the first photoinitiator mainly acts as a surface cure and the second photoinitiator acts as a deep cure.

The yellowing values of the adhesive film at the initial stage and after the adhesive film is placed in a standard fluorescent aging box for 600 hours are respectively tested, and the test results are shown in table 2:

TABLE 2 yellowing values of OCA optical films for touch panels synthesized in examples 1 to 14 and comparative examples 1 to 12

Item	Yellowing (initial glue film)	Yellowing (glue film after 600h in fluorescent ultraviolet aging box)
			Example 1	1.5	1.8
Example 2	1.6	1.7
			Example 3	1.6	1.9
Example 4	1.5	1.8
			Example 5	1.5	1.9
Example 6	1.6	1.9
			Example 7	1.5	1.7
Example 8	1.6	1.9
			Example 9	1.6	1.8
Example 10	1.7	1.9
			Example 11	1.5	1.8
Example 12	1.5	1.9
			Example 13	1.7	2.0
Example 14	1.8	2.0
			Comparative example 1	1.8	1.9
Comparative example 2	1.8	2.0
			Comparative example 3	1.8	2.0
Comparative example 4	1.7	1.9
			Comparative example 5	2.4	2.8
Comparative example 6	2.1	2.4
			Comparative example 7	1.6	1.8
Comparative example 8	1.7	1.9
			Comparative example 9	2.4	2.9
Comparative example 10	1.6	1.8
			Comparative example 11	1.6	1.8
Comparative example 12	2.3	2.6

As shown in Table 2, by comparing the test results of examples 1, 11, 12 and 5, it can be seen that the excessive addition of the antioxidant can result in incomplete photo-curing reaction and increase the yellowing value of the adhesive film; as can be seen from the comparison of the test results of example 1, example 13, example 14 and comparative example 12, when the amount of the second photoinitiator, i.e., ethyl 2,4, 6-trimethylbenzoyl phenylphosphonate, 2,4, 6-trimethylbenzoyl diphenylphosphine oxide or the mixture thereof, exceeds a certain range, yellowing occurs during the re-aging of the adhesive film, mainly because the second photoinitiator, i.e., ethyl 2,4, 6-trimethylbenzoyl phenylphosphonate, 2,4, 6-trimethylbenzoyl diphenylphosphine oxide, has an effect on yellowing of the photocurable coating, and the amount is controlled within a reasonable range.

It should be understood that the above-mentioned embodiments of the present invention are only examples for clearly illustrating the technical solutions of the present invention, and are not intended to limit the specific embodiments of the present invention. Any modification, equivalent replacement, and improvement made within the spirit and principle of the present invention claims should be included in the protection scope of the present invention claims.

Claims

1. The OCA optical cement for the touch screen is characterized by comprising the following raw materials in parts by weight:

100 parts of acrylic resin;

15-35 parts of reactive diluent

0.1-0.5 part of tackifying resin;

0.1-0.5 part of an auxiliary agent;

1.0-2.5 parts of a photoinitiator;

the molecular weight of the acrylic resin is 35-55 ten thousand, and the acrylic resin is formed by polymerizing a hard monomer, a soft monomer and a functional monomer; the weight part of the hard monomer is 5-10 parts, the weight part of the soft monomer is 65-90 parts, and the weight part of the functional monomer is 28-60 parts; the glass transition temperature of the hard monomer is 300-400K; the glass transition temperature of the soft monomer is 180-220K; the functional monomer comprises a hydroxyl-containing monomer, an epoxy-containing monomer, a naphthenic hydrocarbon-containing monomer and a heterocyclic ring-containing monomer;

the reactive diluent comprises 4-tert-butylcyclohexyl acrylate, and the 4-tert-butylcyclohexyl acrylate accounts for 15-50% of the reactive diluent.

2. The OCA optical cement applied to the touch screen according to claim 1, wherein the hard monomer comprises one or more of vinyl acetate, methyl methacrylate, methyl acrylate, ethyl methacrylate, isopropyl methacrylate, isobutyl methacrylate, acrylonitrile and styrene; and/or the soft monomer is one or more of n-butyl acrylate, isooctyl acrylate and isodecyl acrylate; and/or, the hydroxyl group-containing monomer comprises one or more of hydroxyethyl methacrylate, hydroxyethyl acrylate, hydroxypropyl methacrylate, hydroxypropyl acrylate and hydroxybutyl acrylate; and/or, the epoxy-containing monomer comprises one or both of glycidyl methacrylate and glycidyl acrylate; and/or the monomer containing cycloalkane is one or two of isobornyl acrylate and isobornyl methacrylate; and/or the monomer containing the heterocycle comprises one or two of tetrahydrofuran acrylate and tetrahydrofuran methacrylate.

3. The optical cement applied to the OCA of the touch screen according to claim 1, wherein the functional monomer comprises tetrahydrofuran acrylate and glycidyl methacrylate; the tetrahydrofuran acrylate accounts for 15-42% of the functional monomer, and the glycidyl methacrylate accounts for 18-46% of the functional monomer;

4. The OCA optical cement applied to the touch screen as claimed in claim 1, wherein the acrylic resin is prepared by reacting the following components in parts by weight:

5-10 parts of methyl methacrylate;

65-90 parts of isooctyl acrylate;

2-9 parts of hydroxypropyl acrylate;

8-14 parts of tetrahydrofuran acrylate;

2-9 parts of hydroxyethyl acrylate;

6-12 parts of isobornyl acrylate;

10-15 parts of glycidyl methacrylate;

0.5-2.0 parts of a third photoinitiator;

preferably, the preparation method of the acrylic resin comprises the following steps:

adding a hard monomer, a soft monomer, a functional monomer and a third photoinitiator into a reaction kettle, uniformly stirring, introducing nitrogen to remove oxygen, and performing ultraviolet radiation polymerization to obtain acrylic resin;

preferably, the third photoinitiator comprises one or more of 1-hydroxycyclohexyl phenyl ketone, 2-hydroxy-2-methyl-1-phenyl-1-propanone and benzophenone in combination.

5. The OCA optical adhesive applied to the touch screen according to any one of claims 1 to 4, wherein the tackifying resin is one or more of rosin, rosin derivatives, terpene resin, C5 petroleum resin, C9 petroleum resin and C5/C9 petroleum resin;

and/or the reactive diluent also comprises 1, 6-hexanediol diacrylate, isobornyl acrylate and hydroxyethyl acrylate.

6. The OCA optical adhesive applied to the touch screen of any one of claims 1-5, wherein the auxiliary agent comprises a light stabilizer and an antioxidant.

7. The OCA optical adhesive applied to the touch screen according to any one of claims 1 to 6, wherein the light stabilizer comprises one or more of combination of Tinuvin1130, Tinuvin900, Tinuvin770, Tinuvin292, Tinuvin326, Tinuvin171, Tinuvin144 and Tinuvin 328; and/or, the antioxidant also comprises a mixture of one or more of antioxidant 168, antioxidant 1010 and antioxidant 1076.

8. The OCA optical cement applied to the touch screen according to any one of claims 1 to 7, wherein the photoinitiator comprises a first photoinitiator and a second photoinitiator; the first photoinitiator comprises one or two of 1-hydroxycyclohexyl phenyl ketone and 2-hydroxy-2-methyl-1-phenyl-1-acetone; the second photoinitiator comprises one or two of 2,4, 6-trimethylbenzoyl phenyl phosphonic acid ethyl ester and 2,4, 6-trimethylbenzoyl diphenyl phosphine oxide.

9. The use of the optical cement according to any one of claims 1 to 8, wherein the OCA optical cement is coated on a first heavy release film substrate, and then a second light release film is attached, and the curing is completed by ultraviolet irradiation.

10. An OCA optical film comprising the OCA optical adhesive according to any one of claims 1-8 after curing.