TWI670349B - Adhesive and method for fabricating adhesive - Google Patents

Abstract

An adhesive comprising 20 parts by weight to 80 parts by weight of a prepolymer, 0.01 parts by weight to 30 parts by weight of a dopamine derivative, and 0.1 parts by weight to 10 parts by weight of an initiator. A method of preparing the adhesive is also proposed. The adhesive has the effects of fast curing reaction, high heat resistance and strong bonding force.

Description

Adhesive and preparation method thereof

An adhesive, especially an adhesive comprising a dopamine derivative.

Adhesives have the advantages of fast curing speed, high strength and environmental protection, so they are widely used in the fields of optics, electronics, medical and health, aviation, printing and so on.

However, different types of solid adhesives have certain limitations. For example, an adhesive mainly composed of a structure such as urethane acrylate or acrylate has poor heat resistance and is easily softened at a high temperature. An adhesive mainly composed of a structure such as bisphenol A or an alicyclic epoxy resin has a slow curing speed and a weak adhesive force.

Therefore, it is an extremely problem for those skilled in the art to improve the use value and application of an adhesive which can achieve rapid curing, strong adhesion and heat resistance.

An adhesive comprising 20 parts by weight to 80 parts by weight of a prepolymer, 0.01 parts by weight to 30 parts by weight of a dopamine derivative, and 0.1 parts by weight to 10 parts by weight of an initiator.

In one embodiment, the above adhesive further comprises 20 parts by weight to 80 parts by weight of a reactive diluent.

In one embodiment, the above-mentioned adhesive, the prepolymer is 30 parts by weight to 70 parts by weight, the dopamine derivative is 0.1 parts by weight to 30 parts by weight, and the initiator is 3 parts by weight to 8 parts by weight.

In one embodiment, the above-mentioned adhesive, the initiator is a photoinitiator, a thermal initiator or a combination thereof.

In one embodiment, the above-mentioned adhesive, prepolymer is pure acrylic resin, bisphenol A epoxy acrylate resin, phenolic epoxy acrylate resin, epoxidized oil acrylate resin, modified epoxy acrylate resin An aliphatic urethane acrylate resin, an aromatic urethane acrylate resin, a polyester acrylate resin, a hyperbranched polyfunctional polyester resin, a bisphenol A epoxy resin, an alicyclic epoxy resin or a combination thereof.

A method for preparing an adhesive comprising 0.01 to 10 parts by weight of ethanol and 0.01 to 30 parts by weight of a dopamine derivative at a temperature of 20 degrees (° C.) to 30 degrees (° C.) at a stirring speed 50 times per minute (rpm) ~ 800 revolutions per minute (rpm) and mixing time of 10 minutes ~ 30 minutes (min) to obtain dopamine solution; 0.01 parts by weight to 5 parts by weight of reactive diluent added to 0.1 Parts by weight to 20 parts by weight of the initiator, at a temperature of 10 degrees (°C) to 30 degrees (°C), at a stirring speed of 50 per minute (rpm) to 800 per minute (rpm) and a stirring time of 20 minutes~ The initiator solution is obtained by mixing under 60 minutes (min); adding 20 to 100 parts by weight of the prepolymer to the dopamine solution and the initiator solution at a temperature of 20 degrees (° C.) to 30 degrees (° C.) The mixture is obtained by mixing at a stirring speed of 100 per minute (rpm) to 500 per minute (rpm) and a stirring time of 60 minutes to 120 minutes (min); and the adhesive is at a stirring speed of 5 RPM (rpm) ~ 50 rpm, and Space of 0.1 megapascals (Mpa), the time of 3 hours to 8 hours (Hr of) the degassing process conditions.

Another method for preparing an adhesive comprises adding 0.01 parts by weight to 10 parts by weight of ethanol and 0.01 parts by weight to 30 parts by weight of the dopamine derivative at a temperature of 20 degrees (° C.) to 30 degrees (° C.) for stirring. Speed 50 rpm (rpm) ~ 800 rpm (rpm), stirring time is 10 minutes ~ 30 minutes (min) mixed to obtain dopamine solution; 0.01 parts by weight to 5 parts by weight of the first reactive diluent Add 0.1 parts by weight to 20 parts by weight of initiator, at a temperature of 10 degrees (°C) to 30 degrees (°C), at a stirring speed of 50 per minute (rpm) to 800 per minute (rpm), and the stirring time is The initiator solution is obtained by mixing under the conditions of 20 minutes to 60 minutes (min); adding 20 parts by weight to 80 parts by weight of the second reactive diluent to the dopamine solution and the initiator solution at a temperature of 20 degrees (° C.) to 30 Under the condition of (degrees C), stirring speed 50 rpm (rpm) ~ 800 rpm (rpm), stirring time 20 minutes ~ 60 minutes, stirring and mixing to obtain the reaction liquid; 20 parts by weight ~ 100 weight The reaction solution is added to the prepolymer at a temperature of 20 ° C (° C At ~30 degrees (°C), the mixture is obtained by mixing at a stirring speed of 100 per minute (rpm) to 500 per minute (rpm) and a stirring time of 60 minutes to 120 minutes (min); The adhesive is degassed at a stirring speed of 5 rpm (rpm) to 50 rpm (rpm) and a vacuum of 0.1 MPa (Mpa) for 3 hours to 8 hours (Hr). deal with.

A method for preparing an adhesive comprising adding 0.01 part by weight to 30 parts by weight of a dopamine derivative and 0.1 part by weight to 20 parts by weight of an initiator to 1 part by weight to 3 parts by weight of the phenyl glycidyl ether; Mix at a temperature of 10 degrees (°C) to 30 degrees (°C) at a stirring speed of 50 rpm (rpm) to 800 rpm (rpm) and a stirring time of 20 minutes to 60 minutes (min). a reaction solution; 0.01 parts by weight to 5 parts by weight of a reactive diluent is added to the reaction solution at a temperature of 10 degrees (° C.) to 30 degrees (° C.) at a stirring speed of 50 rpm (rpm) to 800 Mixing per minute (rpm) and stirring time of 20 minutes to 60 minutes (min) to obtain a mixed solution; adding 20 parts by weight to 100 parts by weight of the prepolymer to the mixed solution at a temperature of 20 At a degree (°C) ~ 30 degrees (°C), mixing at a stirring speed of 100 per minute (rpm) to 500 per minute (rpm) and a stirring time of 60 minutes to 120 minutes (min) to obtain a Adhesive body; and the adhesive body is rotated at a stirring speed of 5 per minute (rpm) ~ 50 per minute Speed (rpm), and defoaming treatment was carried out under the conditions of a vacuum of 0.1 MPa (Mpa) and a time of 3 hours to 8 hours (Hr) to obtain an adhesive.

In one embodiment, the method for preparing the above adhesive, the prepolymer is pure acrylic resin, bisphenol A epoxy acrylate resin, phenolic epoxy acrylate resin, epoxidized oil acrylate resin, modified epoxy acrylate An ester resin, an aliphatic urethane acrylate resin, an aromatic urethane acrylate resin, a polyester acrylate resin, a hyperbranched polyfunctional polyester resin, a bisphenol A epoxy resin, an alicyclic epoxy resin, or a combination thereof.

In one embodiment, the method for preparing the above adhesive, the initiator is a photoinitiator, a thermal initiator or a combination thereof.

An adhesive of the following formula (1): (1) wherein, in the formula (1), R represents hydrogen, a hydroxyl group, an alkyl group or an alkoxy group; Y represents an alkyl group, a cycloalkyl group, an aryl group or an aralkyl group; and n is a positive integer of 1 or more.

In the above embodiment, the adhesive is a single component in the system, which can be cured by light or heat, and the light-irradiated portion can be quickly cured. If some of the glue is hard to be conveyed and cured, it can be heated. The reaction cures. The adhesive proposed in the above embodiment has the characteristics of fast curing speed, high heat resistance and strong adhesive force, and can be widely used in various fields.

In one embodiment, the adhesive comprises 20 parts by weight to 80 parts by weight of the prepolymer, 0.01 parts by weight to 30 parts by weight of the dopamine derivative, and 0.1 parts by weight to 10 parts by weight of the initiator. In one embodiment, the prepolymer may be a pure acrylic resin, a bisphenol A epoxy acrylate resin, a phenolic epoxy acrylate resin, an epoxidized oil acrylate resin, a modified epoxy acrylate resin, an aliphatic polyurethane. An acrylate resin, an aromatic urethane acrylate resin, a polyester acrylate resin, a hyperbranched polyfunctional polyester resin, a bisphenol A epoxy resin, an alicyclic epoxy resin, or a combination of one or a combination of two or more thereof.

In one embodiment, the dopamine derivative is a monomer or polymer having a dopamine catechol structure, and represents a formula (A) wherein R is a group having both a carbon-carbon double bond and a carbon-oxygen double bond structure. (A)

In one embodiment, the molecular formula of the dopamine derivative can be expressed as the following formula (B): (B)

In another embodiment, the molecular formula of the dopamine derivative can be represented by the following formula (C): (C)

The initiator is a photoinitiator, a thermal initiator, or a combination thereof. In some embodiments, for a photoinitiator, the photoinitiator is further divided into a free radical initiator and a cationic initiator, and the free radical photoinitiator is 2-hydroxy-2-methyl-1phenylacetone (light) Initiator 1173), 2,4,6-(trimethylbenzylidene), diphenylphosphine oxide (TPO), 2-hydroxy-2-methyl-1-p-hydroxyethyl ether phenylacetone (Photoinitiator 2959), bis(2,4,6-trimethylbenzylidene)phenylphosphine oxide (photoinitiator 819) and 1-hydroxycyclohexyl benzophenone (photoinitiator 184) One or a combination of two or more. The cationic photoinitiator is diphenyliodonium hexafluorophosphate, diphenylsulfonium hexafluorophosphate, triarylsulfonium hexafluoroantimonate, triarylsulfonium hexafluorophosphate, triarylsulfonium borate, mixed type One or a combination of two or more of sulphur hexafluoroantimonate and mixed sulphur hexafluorophosphate; in some embodiments, for a thermal initiator, the thermal initiator is classified as a peroxide initiator or cation Acid hot initiator. The peroxide initiators are cumene hydroperoxide (CHP), dicumyl peroxide (DCP), dilaurin peroxide (LPO), benzammonium peroxide (BPO), azobisisobutyronitrile. . The cationic acid thermal initiators are sulfonium hexafluoroantimonate and sulfonium borate.

In one embodiment, the above adhesive further comprises 20 parts by weight to 80 parts by weight of a reactive diluent. In one embodiment, the reactive diluent can be a monofunctional, difunctional or polyfunctional acrylate. In another embodiment, the reactive diluent can be a monofunctional or difunctional epoxy resin. In still another embodiment, the reactive diluent may be one or a combination of two or more of an alcohol and an ester solvent. The following will be further explained.

In some embodiments, the monofunctional acrylate in the above reactive diluent may be lauric acid acrylate, lauric acid methacrylate, isobornyl acrylate, isobornyl methacrylate, tetrahydrofuran. One or a combination of two or more of acrylate and ethoxyethoxyethyl acrylate; the above-mentioned difunctional acrylate may be diethylene glycol diacrylate or triethylene glycol diacrylate , dipropylene di pure diacrylate, tripropylene glycol diacrylate, 1,4-butanediol diacrylate, 1,6-hexanediol diacrylate, neopentyl glycol diacrylate, phthalic acid One or a combination of two or more of formic acid ethylene glycol diacrylate, polyethylene glycol (200) diacrylate, polyethylene glycol (400) diacrylate, polyethylene glycol (600) diacrylate; The polyfunctional acrylate may be trihydroxymethylpropane triacrylate, pentaerythritol triacrylate, ditrimethylolpropane acrylate, dipentaerythritol pentaacrylate, tris(2-hydroxyethyl)isocyanate One or a combination of two or more of uric acid triacrylate, fifteen ethoxy trimethylolpropane triacrylate, and trimethylolpropane trimethacrylate.

In still other embodiments, the mono-active epoxy resin of the above reactive diluent may be 3-ethyl-3-oxabutanemethanol (CAS No.: 3047-32-3), 3, 3' -[oxybismethylene]bis[3-ethyl]oxetane (CAS No.: 18934-00-4), one or a combination of two or more of phenyl glycidyl ether; The epoxy resin may be one or a combination of two or more of 1,2-epoxy-4-vinylcyclohexane and 3,4-epoxycyclohexyl methacrylate.

In still other embodiments, the alcohol or ester solvent of the above reactive diluent may be one or a combination of two or more of ethanol, glycerin, and γ-butyrolactone.

Regarding the characteristics of the adhesive, in one embodiment, the viscosity at 25 degrees (° C.) is from 500 mPa·s to 10,000 mPa·s (cps). At 25 degrees (°C), the adhesive has a bonding force of 4 MPa to 7 MPa (Mpa) after bonding with glass. The adhesive has a glass transition temperature (Tg) of 65 degrees (°C) to 150 degrees (°C).

In one embodiment, the adhesive comprises 30 parts by weight to 70 parts by weight of the prepolymer, 0.1 parts by weight to 30 parts by weight of the dopamine derivative, and 3 parts by weight to 8 parts by weight of the initiator.

1 is a flow chart showing a method of preparing an adhesive of an embodiment. Referring to FIG. 1, a method for preparing an adhesive comprises preparing a dopamine solution (step S101), preparing an initiator solution (step S102), adding the dopamine solution obtained in step S101 and the initiator solution obtained in step S102 to a prepolymerization. The substance is formed into a colloid (step S103) and defoaming is performed (step S104). The following are detailed preparation conditions for each step:

In step S101, 0.01 parts by weight to 10 parts by weight of ethanol and 0.01 parts by weight to 30 parts by weight of the dopamine derivative are heated at a temperature of 20 degrees (° C.) to 30 degrees (° C.) at 50 rpm. The mixture is stirred at a speed of rpm of 10 minutes per minute (rpm), and the stirring time is 10 minutes to 30 minutes (min). Here, ethanol is mixed with the dopamine derivative to obtain the dopamine solution.

In step S102, 0.01 parts by weight to 5 parts by weight of the reactive diluent is added to 0.1 to 20 parts by weight of the initiator at a temperature of 10 degrees (° C.) to 30 degrees (° C.) at 50 rpm. Stirring is carried out at a speed of (rpm) ~800 (rpm), and the stirring time is 20 minutes to 60 minutes (min). Here, the active diluent is mixed with an initiator to obtain the initiator solution.

In step S103, 20 parts by weight to 100 parts by weight of the prepolymer is added to the aforementioned dopamine solution and the initiator solution at a temperature of 20 degrees (° C.) to 30 degrees (° C.) at 100 rpm (rpm). The stirring speed is from 60 minutes to 120 minutes (min), and the prepolymer is mixed with the aforementioned dopamine solution and the initiator solution to obtain a cement. In one embodiment, the prepolymer may be a pure acrylic resin, a bisphenol A epoxy acrylate resin, a phenolic epoxy acrylate resin, an epoxidized oil acrylate resin, a modified epoxy acrylate resin, an aliphatic polyurethane. An acrylate resin, an aromatic urethane acrylate resin, a polyester acrylate resin, a hyperbranched polyfunctional polyester resin, a bisphenol A epoxy resin, an alicyclic epoxy resin, or a combination of one or a combination of two or more thereof.

In step S104, the adhesive is agitated at a speed of 5 revolutions per minute (rpm) to 50 revolutions per minute (rpm). Further, the defoaming treatment is carried out under a vacuum of 0.1 MPa (Mpa), and the defoaming time is 3 hours to 8 hours (Hr), whereby an adhesive can be obtained.

2 is a flow chart showing a method of preparing an adhesive according to another embodiment of the present invention. Referring to FIG. 2, the preparation method of the adhesive comprises preparing a dopamine solution (step S201), preparing an initiator solution (step S202), adding the dopamine solution obtained in step S201 and the initiator solution obtained in step S202 to the reactive diluent. A reaction liquid is formed to form a reaction liquid (step S203), a reaction liquid is added to a prepolymer to form an adhesive body (step S204), and a defoaming treatment is performed (step S205). The following are detailed preparation conditions for each step:

In step S201, 0.01 parts by weight to 10 parts by weight of ethanol and 0.01 parts by weight to 30 parts by weight of the dopamine derivative are heated at a temperature of 20 degrees (° C.) to 30 degrees (° C.) at a stirring speed of 50 minutes per minute. (rpm) ~800 per minute (rpm) and agitation time of 10 minutes to 30 minutes (min) to obtain a dopamine solution.

In step S202, 0.01 parts by weight to 5 parts by weight of the first reactive diluent is added to 0.1 to 20 parts by weight of the initiator at a temperature of 10 degrees (° C.) to 30 degrees (° C.) at a stirring speed. 50 minutes per minute (rpm) to 800 revolutions per minute (rpm) and agitation time of 20 minutes to 60 minutes (min) to obtain an initiator solution.

In step S203, 20 parts by weight to 80 parts by weight of the second reactive diluent is added to the dopamine solution and the initiator solution at a temperature of 20 degrees (° C.) to 30 degrees (° C.) and a stirring speed of 50 rpm (rpm). ) ~800 rotations per minute (rpm), stirring time 20 minutes to 60 minutes, stirring and mixing to obtain a reaction solution.

It should be noted that, in one embodiment, the first reactive diluent and the second reactive diluent may each be a monofunctional, difunctional or polyfunctional acrylate. In another embodiment, the first reactive diluent and the second reactive diluent may each be a monofunctional or difunctional epoxy resin. In still another embodiment, the first reactive diluent and the second reactive diluent may be one or a combination of two or more of an alcohol and an ester solvent, respectively.

In another embodiment, the first reactive diluent and the second reactive diluent may be different reactive diluents, for example, the first reactive diluent is phenyl glycidyl ether, and the second reactive diluent may be epoxy. Resin oligomer. However, the first reactive diluent and the second reactive diluent may also be the same reactive diluent, which is not limited in the present invention.

In step S204, 20 parts by weight to 100 parts by weight of the prepolymer is added to the above reaction liquid at a temperature of 20 degrees (° C.) to 30 degrees (° C.) at a stirring speed of 100 per minute (rpm). The mixture was mixed at a speed of 500 rpm and a stirring time of 60 minutes to 120 minutes (min) to obtain a cement.

In step S205, the adhesive body is stirred at a speed of 5 revolutions per minute (rpm) to 50 revolutions per minute (rpm), and defoaming is performed under a vacuum of 0.1 MPa (Mpa). The defoaming time is 3 hours to 8 hours (Hr), and an adhesive can be obtained.

As a specific example, first, 2 parts by weight of ethanol and 0.2 parts by weight of dopamine derivative are stirred and mixed at a stirring speed of 100 rpm for 10 minutes (min) at a temperature of 26 degrees (° C.) to obtain dopamine. Solution.

Next, 1 part by weight of phenyl glycidyl ether was added to 3.5 parts by weight of a photoinitiator and 1.3 parts by weight of a thermal initiator, and stirred at a stirring speed of 400 per minute (rpm) at a temperature of 26 degrees (° C.). The mixture was mixed under conditions of 230 minutes (min) to obtain an initiator solution.

Next, 22.25 parts by weight of 3,4-epoxycyclohexyl methacrylate was sequentially added to the dopamine solution and the initiator solution at a stirring speed of 500 rpm and stirring at a temperature of 26 ° C (° C.). Under the conditions of 30 minutes, the mixture was stirred to obtain a reaction liquid.

Next, 70 parts by weight of the alicyclic epoxy resin was added to the above reaction liquid at a temperature of 26 degrees (° C.) at a stirring speed of 500 per minute (rpm) and a stirring time of 90 minutes (min). Mix down to obtain a colloid.

Then, the adhesive was stirred at a speed of 30 rpm, and defoaming was carried out at a vacuum of 0.1 MPa, and the defoaming time was 8 hours (Hr). , you can get the adhesive.

3 is a flow chart showing a method of preparing an adhesive of still another embodiment. Referring to FIG. 3, a method for preparing an adhesive comprises preparing a reaction liquid (step S301), adding the reaction liquid obtained in step S301 to a reactive diluent to prepare a mixed liquid (step S302), and adding the mixed liquid to a prepolymer. The medium is formed to form an adhesive body (step S303) and the defoaming process is performed (step S304). The following are detailed preparation conditions for each step:

In step S301, 0.01 parts by weight to 30 parts by weight of the dopamine derivative and 0.1 parts by weight to 20 parts by weight of the initiator are added to 1 part by weight to 3 parts by weight of the phenyl glycidyl ether at a temperature of 10 degrees (° C. At ~30 degrees (°C), mixing is carried out at a stirring speed of 50 per minute (rpm) to 800 per minute (rpm) and a stirring time of 20 minutes to 60 minutes (min) to obtain a reaction liquid. In one embodiment, 0.2 parts by weight of dopamine derivative, 3.5 parts by weight of triarylsulfonium hexafluoroantimonate (initiator), and 1.3 parts by weight of diphenylsulfonium hexafluoride are added to 1 part by weight of phenyl glycidyl ether. Phosphate (initiator) was stirred at a rate of 400 revolutions per minute (rpm) at 26 degrees (° C.) for 30 minutes (min) to obtain the reaction liquid. Here, the reaction liquid prepared in the step S301 is different from the reaction liquid prepared in the step S203. The phenyl glycidyl ether of the step S301 is a mono-functional epoxy monomer and can participate in the reaction. In step S302, 0.01 to 5 parts by weight of the reactive diluent is added to the above reaction solution at a temperature of 10 degrees (° C.) to 30 degrees (° C.) at a stirring speed of 50 per minute (rpm). The mixture was mixed at a speed of 800 rpm and a stirring time of 20 minutes to 60 minutes (min) to obtain a mixed liquid.

In step S303, 20 parts by weight to 100 parts by weight of the prepolymer is added to the above mixed liquid at a temperature of 20 degrees (° C.) to 30 degrees (° C.), and a stirring speed of 100 per minute (rpm) to 500 per unit. The gel was obtained by mixing at a minute rotation speed (rpm) and a stirring time of 60 minutes to 120 minutes (min).

In step S304, the adhesive body is stirred at a speed of 5 revolutions per minute (rpm) to 50 revolutions per minute (rpm), and defoaming is performed under a vacuum of 0.1 MPa (Mpa). The defoaming time is 3 hours to 8 hours (Hr), and an adhesive can be obtained.

In one embodiment, when the prepolymer is an epoxy resin, after the epoxy resin reacts with the dopamine derivative, the dopamine derivative is entangled on the epoxy resin forming the crosslinked structure, or an interpenetrating polymer is formed. Interpenetrating Polymer Networks (IPN). In another embodiment, when the prepolymer is an acrylate, for example, but not limited to, a resin containing a reactive double bond such as an epoxy acrylate or a urethane acrylate resin, the acrylate reacts with the dopamine derivative. Thereafter, the dopamine derivative is partially entangled in the main chain and a part is attached to the main chain. Here, when the adhesive is irradiated with light (for example, ultraviolet light) or receives heat, changes in physical crosslinking and chemical crosslinking may occur. In one embodiment, the adhesive is represented by the following formula (1): (1)

Wherein, in the formula (1), X represents a crosslinked or partially crosslinked prepolymer, wherein X is a three-dimensional network structure. R represents hydrogen, a hydroxyl group, an alkyl group or an alkoxy group. Y represents an alkyl group, a cycloalkyl group, an aryl group or an aralkyl group. Both n and N are positive integers of 1 or more. Here, X may be linked to a long chain or a short chain, or X may be a N long chain or a short chain.

The adhesive of the above embodiment comprises a dopamine derivative which is a marine mussel secretion having an adhesive force. A compound of a small molecule or a small molecule polymer containing a catechol group as a dopamine derivative, added to a prepolymer, and added with a thermal initiator or a photoinitiator to cause the prepolymer body by light or heat. Reaction cross-linking, during the cross-linking reaction, a catechol group (catechol, chemical formula: C ₆ H ₄ (OH) ₂ ) is added to the reaction on the polymer segment, and the catechol has strong binding ability. And the reducing ability, so the obtained adhesive has better adhesion. In addition, the adhesive proposed in another embodiment has a fast curing reaction, a wider application field, and high heat resistance and strong adhesive force.

Steps S101, S102, S103, S104, S201, S202, S203, S204, S205, S301, S302, S303, S304‧‧

1 is a flow chart showing a method of preparing an adhesive according to an embodiment of the present invention. 2 is a flow chart showing a method of preparing an adhesive according to another embodiment of the present invention. 3 is a flow chart showing a method of preparing an adhesive according to still another embodiment of the present invention.

Claims (10)

An adhesive comprising: 20 parts by weight to 80 parts by weight of a prepolymer; 0.01 parts by weight to 0.2 parts by weight of a dopamine derivative; and 0.1 parts by weight to 10 parts by weight of an initiator. The adhesive according to claim 1, further comprising 20 parts by weight to 80 parts by weight of the reactive diluent. The adhesive according to claim 1, wherein the prepolymer is 30 parts by weight to 70 parts by weight, the dopamine derivative is 0.1 parts by weight to 0.2 parts by weight, and the initiator is 3 parts by weight to 8 parts by weight. . The adhesive according to claim 1, wherein the initiator is a photoinitiator, a thermal initiator or a combination thereof. The adhesive according to claim 1, wherein the prepolymer is pure acrylic resin, bisphenol A epoxy acrylate resin, phenolic epoxy acrylate resin, epoxidized oil acrylate resin, modified epoxy acrylate resin An aliphatic urethane acrylate resin, an aromatic urethane acrylate resin, a polyester acrylate resin, a hyperbranched polyfunctional polyester resin, a bisphenol A epoxy resin, an alicyclic epoxy resin or a combination thereof. A method for preparing an adhesive comprising: 0.01 parts by weight to 10 parts by weight of ethanol and 0.01 parts by weight to 30 parts by weight of a dopamine derivative at a temperature of 20 degrees (° C.) to 30 degrees (° C.) for stirring Speed 50 minutes per minute (rpm) ~ 800 revolutions per minute (rpm) and mixing time of 10 minutes ~ 30 minutes (min) to obtain a dopamine solution; Add 0.01 parts by weight to 20 parts by weight of the initiator to 0.01 to 5 parts by weight of the reactive diluent at a temperature of 10 degrees (° C.) to 30 degrees (° C.) at a stirring speed of 50 rpm. ~800 per minute (rpm) and mixing time of 20 minutes to 60 minutes (min) to obtain an initiator solution; 20 parts by weight to 100 parts by weight of the prepolymer is added to the dopamine solution and The initiator solution is stirred at a temperature of 20 degrees (° C.) to 30 degrees (° C.) at a stirring speed of 100 per minute (rpm) to 500 per minute (rpm) and a stirring time of 60 minutes to 120 minutes (min). Under the conditions of mixing, to obtain a colloid; and the adhesive at a stirring speed of 5 revolutions per minute (rpm) ~ 50 revolutions per minute (rpm), and a vacuum of 0.1 MPa (Mpa), The defoaming treatment was carried out under the conditions of 3 hours to 8 hours (Hr) to obtain an adhesive. A method for preparing an adhesive comprising: 0.01 parts by weight to 10 parts by weight of ethanol and 0.01 parts by weight to 30 parts by weight of a dopamine derivative at a temperature of 20 degrees (° C.) to 30 degrees (° C.) for stirring Speed 50 times per minute (rpm) ~ 800 revolutions per minute (rpm) and mixing time is 10 minutes ~ 30 minutes (min) to obtain a dopamine solution; 0.01 parts by weight to 5 parts by weight of a first activity 0.1 parts by weight to 20 parts by weight of the initiator is added to the diluent at a temperature of 10 degrees (° C.) to 30 degrees (° C.) at a stirring speed of 50 per minute (rpm) to 800 per minute (rpm) and stirring. Mixing time for 20 minutes to 60 minutes (min) to obtain an initiator solution; adding 20 parts by weight to 80 parts by weight of a second reactive diluent to the dopamine solution, the initiator solution at a temperature 20 degrees (°C) ~ 30 degrees (°C), stirring speed 50 per At a minute rotation speed (rpm) of 800 per minute (rpm) and a stirring time of 20 minutes to 60 minutes, stirring and mixing to obtain a reaction liquid; and adding 20 parts by weight to 100 parts by weight of the prepolymer to the reaction liquid Mix at a temperature of 20 degrees (°C) to 30 degrees (°C) at a stirring speed of 100 per minute (rpm) to 500 per minute (rpm) and a stirring time of 60 minutes to 120 minutes (min). And obtain a glue; and the adhesive body at a stirring speed of 5 rpm (rpm) ~ 50 rpm (rpm), and a vacuum of 0.1 MPa (Mpa), time 3 hours ~ The defoaming treatment was carried out under conditions of 8 hours (Hr) to obtain an adhesive. A method for preparing an adhesive comprising: adding 0.01 part by weight to 30 parts by weight of a dopamine derivative and 0.1 part by weight to 20 parts by weight of an initiator to 1 part by weight to 3 parts by weight of phenyl glycidyl ether; Mix at a temperature of 10 degrees (°C) to 30 degrees (°C) at a stirring speed of 50 rpm (rpm) to 800 rpm (rpm) and a stirring time of 20 minutes to 60 minutes (min). a reaction solution; 0.01 parts by weight to 5 parts by weight of a reactive diluent is added to the reaction solution at a temperature of 10 degrees (° C.) to 30 degrees (° C.) at a stirring speed of 50 rpm (rpm) to 800 Mixing per minute (rpm) and stirring time of 20 minutes to 60 minutes (min) to obtain a mixed solution; adding 20 parts by weight to 100 parts by weight of the prepolymer to the mixed solution at a temperature of 20 At a degree (°C) ~ 30 degrees (°C), mixing at a stirring speed of 100 per minute (rpm) to 500 per minute (rpm) and a stirring time of 60 minutes to 120 minutes (min) to obtain a Adhesive body; and The adhesive is subjected to a stirring speed of 5 revolutions per minute (rpm) to 50 revolutions per minute (rpm) and a vacuum of 0.1 MPa (Mpa) for 3 hours to 8 hours (Hr). Defoaming treatment to obtain an adhesive. The method for preparing an adhesive according to claim 6, wherein the initiator is a photoinitiator, a thermal initiator or a combination thereof. The method for preparing an adhesive according to claim 6, wherein the prepolymer is a pure acrylic resin, a bisphenol A epoxy acrylate resin, a phenolic epoxy acrylate resin, or an epoxidized oil acrylate resin. , modified epoxy acrylate resin, aliphatic urethane acrylate resin, aromatic urethane acrylate resin, polyester acrylate resin, hyperbranched polyfunctional polyester resin, bisphenol A epoxy resin, alicyclic epoxy Resin or a combination thereof.