High-performance solvent type polyurethane modified acrylate pressure-sensitive adhesive and preparation method thereof

Abstract

The invention provides a high-performance solvent type polyurethane modified acrylate pressure-sensitive adhesive which is characterized by comprising the following raw materials in parts by weight: 10 parts of a polyurethane prepolymer, 10 parts of a solvent, 10 parts of a solvent and 10 parts of a solvent, the adhesive is prepared from the following components in parts by weight: 3.84 parts of diphenyl methane diisocyanate (MDI) 50, 4.62 parts of polyether polyol 220, 0.58 part of diethylene glycol, 0.96 part of dimethylolpropionic acid, 27.5 parts of 2-ethylhexyl acrylate, 10 parts of butyl acrylate, 1.5 parts of ethyl acrylate, 8.5 parts of methyl methacrylate, 1 part of hydroxyethyl acrylate, 1.5 parts of acrylic acid, 87 parts of ethyl acetate, 3 parts of N-methyl pyrrolidone, 0.5 part of pentaerythritol tetraacrylate and 1 part of a cross-linking agent KH560. 0.25 part of azodiisobutyronitrile; the high-performance solvent type polyurethane modified acrylate pressure-sensitive adhesive disclosed by the invention has high initial adhesion, high peel strength, high permanent adhesion and good high and low temperature resistance and humidity and heat resistance, can be widely applied to a plurality of fields such as electronics, automobiles, buildings, packaging and the like, and has wide application prospects and market values.

Description

Technical Field

[0001] The invention relates to the technical field of pressure-sensitive adhesives, in particular to a high-performance solvent-based polyurethane-modified acrylate pressure-sensitive adhesive and a preparation method thereof. Background Art

[0002] Solvent-based acrylic pressure-sensitive adhesives have the advantages of low relative molecular weight, good wettability, strong initial tack, fast drying, and good water resistance. They are widely used in pressure-sensitive labels, packaging tapes, stationery tapes, and double-sided tapes. However, the solvent-based acrylic pressure-sensitive adhesives in the prior art still have certain limitations in certain application scenarios with high performance requirements, such as high temperature resistance, high peel strength, and high holding strength, and cannot fully meet market demand. These limitations are mainly reflected in the fact that pressure-sensitive adhesives are prone to debonding under high temperature conditions, which cannot meet the requirements of use in high temperature environments; in addition, in some applications requiring high-strength bonding, existing pressure-sensitive adhesives cannot achieve the ideal balance of high initial tack, high peel strength, and high holding strength. The existence of these problems makes it difficult for solvent-based acrylic pressure-sensitive adhesives to play their due role in application scenarios with high performance requirements, limiting their application in a wider range of fields. Therefore, how to effectively improve the high temperature resistance of solvent-based acrylic pressure-sensitive adhesives and how to achieve a good balance between high initial tack, high peel strength, and high holding strength have become key technical issues that need to be urgently addressed in this field. Summary of the Invention

[0003] To solve the above problems, the present invention discloses a high-performance solvent-based polyurethane-modified acrylate pressure-sensitive adhesive and a preparation method thereof. The high-performance solvent-based polyurethane-modified acrylate pressure-sensitive adhesive of the present invention has high initial adhesion, high peel strength, high persistent adhesion, and good resistance to high and low temperatures and moisture and heat. It can be widely used in multiple fields such as electronics, automobiles, construction, and packaging, and has broad application prospects and market value.

[0004] A high-performance solvent-based acrylic pressure-sensitive adhesive, the raw materials of which are calculated by weight: 10±0.05 parts of a polyurethane prepolymer, including 3.84±0.05 parts of diphenylmethane diisocyanate MDI 50, 4.62±0.05 parts of polyether polyol 220, 0.58±0.05 parts of diethylene glycol, 0.96±0.05 parts of dimethylolpropionic acid, 27.5±0.05 parts of isooctyl acrylate, 10±0.05 parts of butyl acrylate, 1.5±0.05 parts of ethyl acrylate, 8.5±0.05 parts of methyl methacrylate, 1±0.05 parts of hydroxyethyl acrylate, 1.5±0.05 parts of acrylic acid, 87±0.05 parts of ethyl acetate, 3±0.05 parts of N-methylpyrrolidone, 0.5±0.05 parts of pentaerythritol tetraacrylate, and a crosslinking agent KH560. 1±0.05 parts, azobisisobutyronitrile 0.25±0.05 parts.

[0005] Furthermore, the raw materials include, by weight: 10 parts of polyurethane prepolymer, including 3.84 parts of diphenylmethane diisocyanate MDI 50, 4.62 parts of polyether polyol 220, 0.58 parts of diethylene glycol, 0.96 parts of dihydroxymethylpropionic acid, 27.5 parts of isooctyl acrylate, 10 parts of butyl acrylate, 1.5 parts of ethyl acrylate, 8.5 parts of methyl methacrylate, 1 part of hydroxyethyl acrylate, 1.5 parts of acrylic acid, 87 parts of ethyl acetate, 3 parts of N-methylpyrrolidone, 0.5 part of pentaerythritol tetraacrylate, 1 part of crosslinking agent KH560, and 0.25 part of azobisisobutyronitrile.

[0006] A method for preparing a high-performance solvent-based acrylic pressure-sensitive adhesive comprises the following steps: Step 1: Synthesis of polyurethane prepolymer: Add MDI-50, polyether polyol 220 and diethylene glycol into a four-necked flask, control the temperature at 80°C, and react at a stirring speed of 300 r / min for 1 hour; add dihydroxymethylpropionic acid dissolved in N-methylpyrrolidone, and dilute with an appropriate amount of ethyl acetate, and continue to react at 80°C at a stirring speed of 300 r / min for 1 hour; after the reaction is completed, cool to room temperature to obtain a polyurethane prepolymer for use.

[0007] The advantages of this step design are: step-by-step reaction; by adding reactants step by step, the reaction rate and the molecular weight distribution of the product can be better controlled; the basic polymerization reaction is carried out first, and then the modifier (dihydroxymethylpropionic acid) is added to ensure the uniformity and stability of the prepolymer.

[0008] Step 2: Preparation of mixed monomers: Weigh the following raw materials: isooctyl acrylate, butyl acrylate, ethyl acrylate, methyl methacrylate, hydroxyethyl acrylate, and acrylic acid; stir the raw materials evenly to obtain a mixed monomer for later use.

[0009] The advantages of this step design are: the addition of functional monomers; by adding functional monomers such as acrylic acid and hydroxyethyl acrylate, the bonding performance and weather resistance of the pressure-sensitive adhesive can be improved.

[0010] Step 3: Preparation of base liquid a: Select an acrylate mixture from the mixed monomers; then add the polyurethane prepolymer, hydroxyethyl methacrylate, and organic tin catalyst into a 500 mL four-necked flask; start electric stirring to mix evenly to serve as the base liquid; heat and continue the reaction to obtain base liquid a.

[0011] The advantages of this step design are: combining the prepolymer and the monomer; combining the polyurethane prepolymer with part of the mixed monomer can dilute the polyurethane prepolymer on the one hand, and on the other hand, carry out the grafting reaction to form a stable base liquid.

[0012] Step 4: Preparation of mixed solution b: Dissolve azobisisobutyronitrile in ethyl acetate and place it in a hydraulic funnel; then add the mixture dropwise evenly into a four-necked flask over 2 hours to obtain mixed solution b.

[0013] The advantage of this step design is that the reaction rate can be better controlled by using the dropwise addition method, avoiding the initiator being added all at once, which causes the reaction to be too fast and causes implosion.

[0014] Step 5: Preparation of mixed solution c: After uniform mixing, the acrylate mixture, ethyl acetate and azobisisobutyronitrile were placed in a hydraulic funnel; the mixture was evenly added dropwise to a four-necked flask within 2 hours, and the reaction was continued for 1 hour to obtain mixed solution c.

[0015] The advantages of this step design are: gradual dropwise addition; by gradually adding the remaining monomers and initiator, the progress of the polymerization reaction can be better controlled to ensure a uniform molecular weight distribution of the polymer.

[0016] Step 6: Preparation of mixed solution d: Select azobisisobutyronitrile, dissolve it in ethyl acetate, and place it in a hydraulic funnel; add it dropwise evenly to a four-necked flask within 1 hour, and continue the reaction for 1 hour to obtain mixed solution d.

[0017] The advantages of this step design are: adding an initiator; by adding an initiator, the conversion efficiency of the monomer can be further improved while ensuring the uniformity of the reaction.

[0018] Step 7: Final preparation of pressure-sensitive adhesive: select pentaerythritol tetraacrylate and add it to mixed solution d; continue the reaction for 1 hour, then cool to room temperature; finally, add crosslinking agent KH560, stir evenly and discharge the mixture to obtain a high-performance solvent-based polyurethane modified acrylate pressure-sensitive adhesive.

[0019] The advantages of this design are the use of a crosslinker; adding crosslinker KH560 improves the weather resistance of the pressure-sensitive adhesive, ensuring product stability and reliability in high-temperature environments. Furthermore, by cooling the material to room temperature before adding the crosslinker, the effects of high temperatures on the crosslinker are minimized, ensuring the effectiveness of the subsequent crosslinking reaction.

[0020] Beneficial effects of the present invention: In view of the limitations of the prior art solvent-based acrylic pressure-sensitive adhesives in terms of high temperature resistance, high peel strength, high holding strength, and high initial tack, the present invention achieves the preparation of a high-performance solvent-based polyurethane-modified acrylic pressure-sensitive adhesive through the following improvements, which has significant beneficial effects, as follows: ①Good high temperature resistance; By adding a specific crosslinking agent (such as KH560), the crosslinking reaction of the polymer under high temperature conditions is initiated, thereby improving the high temperature resistance of the polymer. This ensures that the pressure-sensitive adhesive is not easily debonded under high temperature conditions and can still maintain good adhesion properties under low temperature conditions. This significantly improves its adaptability to extreme temperature environments and broadens its application range in electronics, automotive and other fields.

[0021] ②Good balance of high initial adhesion, high peel strength and high holding strength; By introducing dimethylolpropionic acid into the polyurethane prepolymer and copolymerizing it with acrylate monomers, the polymer's molecular structure is optimized. Simultaneously, precise control of the monomer ratios and reaction conditions ensures uniform distribution of the polymer chains. This achieves a perfect balance of high initial tack, high peel strength, and high holding power, significantly improving the performance of the pressure-sensitive adhesive in applications requiring high-strength bonding and meeting the diverse needs of diverse scenarios. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 , is a diagram of the experimental setup of the present invention.

[0023] Figure 2 , is the chemical formula of the present invention. DETAILED DESCRIPTION

[0024] The present invention will be further described below with reference to the accompanying drawings and specific embodiments. It should be understood that the following specific embodiments are intended only to illustrate the present invention and are not intended to limit the scope of the present invention. It should be noted that the terms "front," "rear," "left," "right," "up," and "down" used in the following description refer to directions in the accompanying drawings, and the terms "inward" and "outward" refer to directions toward or away from the geometric center of a particular component, respectively. Example

[0025] T g =-55.6℃ (see notes for calculation method) Preparation of a solvent-based acrylic pressure-sensitive adhesive: Weigh 100 parts of a monomer mixture consisting of 55 parts butyl acrylate, 23 parts ethyl acrylate, 18 parts hydroxyethyl acrylate, and 4 parts acrylic acid. Add 30 parts of the monomer mixture, 60 parts of ethyl acetate, and 0.1 part of azobisisobutyronitrile to a four-necked flask and allow to react at 78°C with a stirring rate of 300 r / min for 1 hour. Then, slowly add the remaining 70 parts of the acrylic acid monomer mixture, 70 parts of ethyl acetate, and 0.1 part of azobisisobutyronitrile to the reaction system dropwise, allowing the monomers to react continuously. The addition time is controlled to 3 hours. After the addition is complete, the reaction is incubated for another 1 hour. Finally, slowly add 0.3 parts of azobisisobutyronitrile and 20 parts of ethyl acetate to the reaction system dropwise, allowing the monomer conversion rate to increase continuously. The addition time is controlled to 2 hours. After the addition is complete, the reaction is incubated for another 1 hour. The solvent-based acrylic pressure-sensitive adhesive is obtained.

[0026] After testing, the performance of the pressure-sensitive adhesive is: initial adhesion is 6# steel ball, 180° peel strength is 0.85kN / m, lasting adhesion is >5 days, and lasting adhesion at 60℃ is 12min. Example

[0027] T g =-83℃ Preparation of solvent-based acrylic pressure-sensitive adhesive: Weigh 100 parts of a monomer mixture consisting of 50 parts isooctyl acrylate, 15 parts butyl acrylate, 10 parts ethyl acrylate, 17 parts methyl methacrylate, 5 parts hydroxyethyl acrylate, and 3 parts acrylic acid. Add 30 parts of the monomer mixture, 60 parts of ethyl acetate, and 0.1 part of azobisisobutyronitrile to a four-necked flask and allow to react at 78°C with a stirring rate of 300 r / min for 1 hour. Then, slowly add the remaining 70 parts of the acrylic acid monomer mixture, 70 parts of ethyl acetate, and 0.1 part of azobisisobutyronitrile to the reaction system dropwise, allowing the monomers to react continuously during the addition. The addition time is controlled to 3 hours. After the addition is complete, the reaction is maintained at this temperature for another 1 hour. Finally, slowly add 0.3 parts of azobisisobutyronitrile and 20 parts of ethyl acetate to the reaction system dropwise, allowing the monomer conversion rate to increase continuously during the addition. The addition time is controlled to 2 hours. After the dropwise addition is completed, the mixture is kept warm for reaction for 1 hour; finally, a solvent-based acrylic pressure-sensitive adhesive is obtained.

[0028] After testing, the performance of the pressure-sensitive adhesive is: initial adhesion is 10# steel ball, 180° peel strength is 0.8 kN / m, low temperature adhesion is >5 days, and 60℃ adhesion is 8 minutes. Example

[0029] T g =-93℃ Preparation of solvent type acrylate pressure sensitive adhesive: 100 parts of mixed monomers were weighed, of which isooctyl acrylate 55 parts, butyl acrylate 20 parts, ethyl acrylate 3 parts, methyl methacrylate 17 parts, hydroxyethyl acrylate 2 parts, and acrylic acid 3 parts. 30 parts of mixed monomers, 60 parts of ethyl acetate and 0.1 part of azobisisobutyronitrile were added to a four-necked flask, and reacted at 78℃ for 1 hour with stirring at 300r / min; then, the remaining 70 parts of mixed monomers, 70 parts of ethyl acetate and 0.1 part of azobisisobutyronitrile were added to the reaction system by slow dropwise addition, and the reaction between the monomers in the system continued during the dropwise addition process, and the dropwise addition time was controlled for 3 hours. After the dropwise addition was completed, it was incubated for 1h; finally, 0.3 parts of azobisisobutyronitrile and 20 parts of ethyl acetate were added to the reaction system by slow dropwise addition, and the monomer conversion rate in the system was continuously improved during the dropwise addition process, and the dropwise addition time was controlled for 2 hours. After the dropwise addition was completed, it was incubated for 1h; finally, the solvent type acrylate pressure sensitive adhesive was obtained.

[0030] After detection, the performance of the pressure sensitive adhesive was: 15# steel ball, 180° peeling strength was 0.74 kN / m, low temperature holding adhesion was >5 days, and 60℃ holding adhesion was 7min. Example

[0031] T g =-111℃ Preparation of solvent type acrylate pressure sensitive adhesive: 100 parts of mixed monomers were weighed, of which isooctyl acrylate 55 parts, butyl acrylate 20 parts, methyl methacrylate 17 parts, hydroxyethyl acrylate 5 parts, and acrylic acid 3 parts. 30 parts of mixed monomers, 60 parts of ethyl acetate and 0.1 part of azobisisobutyronitrile were added to a four-necked flask, and reacted at 78℃ for 1 hour with stirring at 300r / min; then, the remaining 70 parts of mixed monomers, 70 parts of ethyl acetate and 0.1 part of azobisisobutyronitrile were added to the reaction system by slow dropwise addition, and the reaction between the monomers in the system continued during the dropwise addition process, and the dropwise addition time was controlled for 3 hours. After the dropwise addition was completed, it was incubated for 1h; finally, 0.3 parts of azobisisobutyronitrile and 20 parts of ethyl acetate were added to the reaction system by slow dropwise addition, and the monomer conversion rate in the system was continuously improved during the dropwise addition process, and the dropwise addition time was controlled for 2 hours. After the dropwise addition was completed, it was incubated for 1h; finally, the solvent type acrylate pressure sensitive adhesive was obtained.

[0032] After detection, the performance of the pressure sensitive adhesive was: 15# steel ball, 180° peeling strength was 0.74 kN / m, low temperature holding adhesion was >5 days, and 60℃ holding adhesion was 7min. Example

[0033] T g =-93℃ adding KH560 2% Preparation of solvent-based acrylic pressure-sensitive adhesive: Weigh 100 parts of a monomer mixture consisting of 55 parts isooctyl acrylate, 20 parts butyl acrylate, 3 parts ethyl acrylate, 17 parts methyl methacrylate, 2 parts hydroxyethyl acrylate, and 3 parts acrylic acid. Add 30 parts of the monomer mixture, 60 parts of ethyl acetate, and 0.1 part of azobisisobutyronitrile to a four-necked flask and allow to react at 78°C with a stirring rate of 300 r / min for 1 hour. Then, slowly add the remaining 70 parts of the acrylic acid monomer mixture, 70 parts of ethyl acetate, and 0.1 part of azobisisobutyronitrile to the reaction system dropwise, allowing the monomers to react continuously during the addition. The addition time is controlled to 3 hours. After the addition is complete, the reaction is maintained at this temperature for another 1 hour. Finally, slowly add 0.3 parts of azobisisobutyronitrile and 20 parts of ethyl acetate to the reaction system dropwise, allowing the monomer conversion rate to increase continuously during the addition. The addition time is controlled to 2 hours. After the dropwise addition is completed, the mixture is kept warm for reaction for 1 hour; the temperature is lowered to 40°C, 2 parts of KH560 are added and stirred evenly, and finally a solvent-based acrylic pressure-sensitive adhesive is obtained.

[0034] After testing, the performance of the pressure-sensitive adhesive is: initial adhesion is 15# steel ball, 180° peel strength is 0.79 kN / m, low temperature adhesion is >5 days, and 60℃ adhesion is >3h. Example

[0035] Add KH570 10% Preparation of solvent-based acrylic pressure-sensitive adhesive: Weigh 100 parts of a monomer mixture consisting of 50 parts isooctyl acrylate, 18 parts butyl acrylate, 5 parts ethyl acrylate, 17 parts methyl methacrylate, and 10 parts KH570. Add 30 parts of the monomer mixture, 60 parts of ethyl acetate, and 0.1 part of azobisisobutyronitrile to a four-necked flask and stir at 78°C for 1 hour. Then, slowly add the remaining 70 parts of the acrylic acid monomer mixture, 70 parts of ethyl acetate, and 0.1 part of azobisisobutyronitrile dropwise to the reaction system, allowing the monomers to react continuously. The addition time is controlled to 3 hours. After the addition is complete, the reaction is maintained at this temperature for another 1 hour. Finally, slowly add 0.3 parts of azobisisobutyronitrile and 20 parts of ethyl acetate dropwise to the reaction system, allowing the monomer conversion rate to increase continuously. The addition time is controlled to 2 hours. After the addition is completed, the mixture is kept warm for 1 hour; the temperature is lowered to 40°C, KH560 is added and stirred evenly, and finally a high-performance solvent-based acrylic pressure-sensitive adhesive is obtained.

[0036] After testing, the performance of the pressure-sensitive adhesive is: initial adhesion is 19# steel ball, 180° peel strength is 0.31 kN / m, low temperature adhesion is >5 days, and 60℃ adhesion is 3min. Example

[0037] T g=-93℃ Add 20% polyurethane This embodiment discloses a method for preparing a high-performance solvent-based polyurethane modified acrylate pressure-sensitive adhesive. Figure 1 As shown, this embodiment uses a standard laboratory reflux apparatus to carry out the synthesis process. The apparatus consists of a round-bottom flask, a condenser, and a dropping funnel to precisely control the reaction conditions, thereby ensuring that the reaction can proceed smoothly and efficiently. Figure 2 The chemical reaction equation shown here comprehensively illustrates the entire synthesis process from raw materials to the final product. This process is divided into five steps, each involving a specific chemical reaction. These chemical reactions work together to ultimately produce a high-performance pressure-sensitive adhesive. In this example, a polyurethane prepolymer is first synthesized. MDI-50, polyether polyol 220, and diethylene glycol are added to a four-necked flask and stirred at 80°C and 300 rpm for one hour. Dimethylolpropionic acid dissolved in N-methylpyrrolidone is then added and diluted with ethyl acetate. Stirring is continued at 80°C and 300 rpm for one hour, and the polyurethane prepolymer is cooled to room temperature. Next, a mixed monomer is prepared: 27.5 parts of isooctyl acrylate, 10 parts of butyl acrylate, 1.5 parts of ethyl acrylate, 8.5 parts of methyl methacrylate, 1 part of hydroxyethyl acrylate, and 1.5 parts of acrylic acid are weighed and stirred for later use. Next, base solution a was prepared by weighing 15 parts by weight of mixed monomers, 15 parts of polyurethane prepolymer, 1 part of hydroxyethyl methacrylate, and 0.001 part of an organotin catalyst into a 500mL four-necked flask, stirring at 300 rpm, and reacting at 80°C for 3 hours to obtain base solution a. Next, mixed solution b was prepared by dissolving 0.1 part of azobisisobutyronitrile in 30 parts of ethyl acetate and adding the mixture dropwise to the flask over 2 hours. Mixed solution c was prepared by weighing 35 parts of the remaining mixed monomers, 35 parts of ethyl acetate, and 0.05 part of azobisisobutyronitrile, mixing the mixture dropwise to the flask over 2 hours, and continuing the reaction for 1 hour. Next, mixed solution d was prepared by dissolving 0.1 part of azobisisobutyronitrile in 20 parts of ethyl acetate and adding the mixture dropwise to the flask over 1 hour, and continuing the reaction for 1 hour. Finally, 0.5 part of pentaerythritol tetraacrylate was added to mixed solution d, reacting for 1 hour. The mixture was then cooled to room temperature, and the crosslinker KH560 was added, stirred, and discharged to obtain a high-performance solvent-based polyurethane-modified acrylate pressure-sensitive adhesive.

[0038] After testing, the performance of the pressure-sensitive adhesive is: initial adhesion is 19# steel ball, 180° peel strength is 2.11 kN / m, low temperature adhesion is >5 days, and 60℃ adhesion is >3h.

[0039] T g =-83℃ Add 20% polymerized rosin Preparation of solvent-based acrylic pressure-sensitive adhesive: Weigh 100 parts of a monomer mixture consisting of 50 parts isooctyl acrylate, 15 parts butyl acrylate, 10 parts ethyl acrylate, 17 parts methyl methacrylate, 5 parts hydroxyethyl acrylate, and 3 parts acrylic acid. Add 30 parts of the monomer mixture, 60 parts of ethyl acetate, and 0.1 part of azobisisobutyronitrile to a four-necked flask and allow to react at 78°C with a stirring rate of 300 r / min for 1 hour. Then, slowly add the remaining 70 parts of the acrylic acid monomer mixture, 70 parts of ethyl acetate, and 0.1 part of azobisisobutyronitrile to the reaction system dropwise, allowing the monomers to react continuously during the addition. The addition time is controlled to 3 hours. After the addition is complete, the reaction is maintained at this temperature for another 1 hour. Finally, slowly add 0.3 parts of azobisisobutyronitrile and 20 parts of ethyl acetate to the reaction system dropwise, allowing the monomer conversion rate to increase continuously during the addition. The addition time is controlled to 2 hours. After the addition is completed, the mixture is kept warm for reaction for 1 hour; the temperature is lowered to 40° C., polymerized rosin dissolved in dichloromethane is added, and the mixture is stirred evenly to obtain a solvent-based acrylic pressure-sensitive adhesive.

[0040] After testing, the performance of the pressure-sensitive adhesive is: initial adhesion is 10# steel ball, 180° peel strength is 1.18 kN / m, low temperature adhesion is >5 days, and 60℃ adhesion is 15 minutes.

[0041] T g =-83℃ add 20% disproportionated rosin Preparation of solvent-based acrylic pressure-sensitive adhesive: Weigh 100 parts of a monomer mixture consisting of 50 parts isooctyl acrylate, 15 parts butyl acrylate, 10 parts ethyl acrylate, 17 parts methyl methacrylate, 5 parts hydroxyethyl acrylate, and 3 parts acrylic acid. Add 30 parts of the monomer mixture, 60 parts of ethyl acetate, and 0.1 part of azobisisobutyronitrile to a four-necked flask and allow to react at 78°C with a stirring rate of 300 r / min for 1 hour. Then, slowly add the remaining 70 parts of the acrylic acid monomer mixture, 70 parts of ethyl acetate, and 0.1 part of azobisisobutyronitrile to the reaction system dropwise, allowing the monomers to react continuously during the addition. The addition time is controlled to 3 hours. After the addition is complete, the reaction is maintained at this temperature for another 1 hour. Finally, slowly add 0.3 parts of azobisisobutyronitrile and 20 parts of ethyl acetate to the reaction system dropwise, allowing the monomer conversion rate to increase continuously during the addition. The addition time is controlled to 2 hours. After the addition is completed, the mixture is kept warm for 1 hour; the temperature is lowered to 40° C., disproportionated rosin dissolved in dichloromethane is added, and the mixture is stirred evenly to obtain a solvent-based acrylic pressure-sensitive adhesive.

[0042] After testing, the performance of the pressure-sensitive adhesive is: initial adhesion is 10# steel ball, 180° peel strength is 1.14 kN / m, low temperature adhesion is >5 days, and 60℃ adhesion is 14 minutes.

[0043] T g=-83℃ add terpene resin 20% Preparation of solvent-based acrylic pressure-sensitive adhesive: Weigh 100 parts of a monomer mixture consisting of 50 parts isooctyl acrylate, 15 parts butyl acrylate, 10 parts ethyl acrylate, 17 parts methyl methacrylate, 5 parts hydroxyethyl acrylate, and 3 parts acrylic acid. Add 30 parts of the monomer mixture, 60 parts of ethyl acetate, and 0.1 part of azobisisobutyronitrile to a four-necked flask and allow to react at 78°C with a stirring rate of 300 r / min for 1 hour. Then, slowly add the remaining 70 parts of the acrylic acid monomer mixture, 70 parts of ethyl acetate, and 0.1 part of azobisisobutyronitrile to the reaction system dropwise, allowing the monomers to react continuously during the addition. The addition time is controlled to 3 hours. After the addition is complete, the reaction is maintained at this temperature for another 1 hour. Finally, slowly add 0.3 parts of azobisisobutyronitrile and 20 parts of ethyl acetate to the reaction system dropwise, allowing the monomer conversion rate to increase continuously during the addition. The addition time is controlled to 2 hours. After the addition is completed, the mixture is kept warm for reaction for 1 hour; the temperature is lowered to 40° C., polymerized rosin dissolved in dichloromethane is added, and the mixture is stirred evenly to obtain a solvent-based acrylic pressure-sensitive adhesive.

[0044] After testing, the performance of the pressure-sensitive adhesive is: initial adhesion is 12# steel ball, 180° peel strength is 1.8 kN / m, low temperature adhesion is >5 days, and 60℃ adhesion is 16 minutes.

[0045] T g =-83℃ add C5 / C9 petroleum resin 20% Preparation of solvent-based acrylic pressure-sensitive adhesive: Weigh 100 parts of a monomer mixture consisting of 50 parts isooctyl acrylate, 15 parts butyl acrylate, 10 parts ethyl acrylate, 17 parts methyl methacrylate, 5 parts hydroxyethyl acrylate, and 3 parts acrylic acid. Add 30 parts of the monomer mixture, 60 parts of ethyl acetate, and 0.1 part of azobisisobutyronitrile to a four-necked flask and allow to react at 78°C with a stirring rate of 300 r / min for 1 hour. Then, slowly add the remaining 70 parts of the acrylic acid monomer mixture, 70 parts of ethyl acetate, and 0.1 part of azobisisobutyronitrile to the reaction system dropwise, allowing the monomers to react continuously during the addition. The addition time is controlled to 3 hours. After the addition is complete, the reaction is maintained at this temperature for another 1 hour. Finally, slowly add 0.3 parts of azobisisobutyronitrile and 20 parts of ethyl acetate to the reaction system dropwise, allowing the monomer conversion rate to increase continuously during the addition. The addition time is controlled to 2 hours. After the addition is completed, the mixture is kept warm for reaction for 1 hour; the temperature is lowered to 40° C., C5 / C9 petroleum resin dissolved in dichloromethane is added, and the mixture is stirred evenly to obtain a solvent-based acrylic pressure-sensitive adhesive.

[0046] After testing, the performance of the pressure-sensitive adhesive is: initial adhesion is 4# steel ball, 180° peel strength is 0.36kN / m, low temperature adhesion is >5 days, and 60℃ adhesion is 17min.

[0047] T g = -93℃ add KH560 1% Preparation of solvent type acrylate pressure sensitive adhesive: take the mixed monomer 100 parts, wherein the isooctyl acrylate 55 parts, butyl acrylate 20 parts, acrylate 3 parts, methyl methacrylate 17 parts, 2 parts of hydroxyethyl acrylate, acrylic acid 3 parts. 30 parts of mixed monomers, 60 parts of ethyl acetate and 0.1 parts of azobisisobutyronitrile were added to a four-necked flask, and the reaction was carried out at 78℃ with stirring speed of 300r / min for 1 hour; then, the remaining 70 parts of acrylic mixed monomer, 70 parts of ethyl acetate, 0.1 parts of azobisisobutyronitrile were added to the reaction system by slow dropwise addition, and the reaction between the monomers in the system continued to occur during the dropwise addition process, and the dropwise addition time was controlled within 3 hours. After the completion of dropwise addition, it was incubated for 1h; finally, 0.3 parts of azobisisobutyronitrile and 20 parts of ethyl acetate were added to the reaction system by slow dropwise addition, and the monomer conversion rate in the system was continuously improved during the dropwise addition process, and the dropwise addition time was controlled within 2 hours. After the completion of dropwise addition, it was incubated for 1h; cool to 40℃, add 1 part of KH560 and stir uniformly, finally get solvent type acrylate pressure sensitive adhesive.

[0048] After detection, the performance of the pressure sensitive adhesive: the initial adhesion is 15# steel ball, the 180° peeling strength is 0.8 kN / m, the low temperature holding adhesion is >5 days, and the 60℃ holding adhesion is >1.5h.

[0049] T g = -93℃ add KH560 3% Preparation of solvent type acrylate pressure sensitive adhesive: take the mixed monomer 100 parts, wherein the isooctyl acrylate 55 parts, butyl acrylate 20 parts, acrylate 3 parts, methyl methacrylate 17 parts, 2 parts of hydroxyethyl acrylate, acrylic acid 3 parts. 30 parts of mixed monomers, 60 parts of ethyl acetate and 0.1 parts of azobisisobutyronitrile were added to a four-necked flask, and the reaction was carried out at 78℃ with stirring speed of 300r / min for 1 hour; then, the remaining 70 parts of acrylic mixed monomer, 70 parts of ethyl acetate, 0.1 parts of azobisisobutyronitrile were added to the reaction system by slow dropwise addition, and the reaction between the monomers in the system continued to occur during the dropwise addition process, and the dropwise addition time was controlled within 3 hours. After the completion of dropwise addition, it was incubated for 1h; finally, 0.3 parts of azobisisobutyronitrile and 20 parts of ethyl acetate were added to the reaction system by slow dropwise addition, and the monomer conversion rate in the system was continuously improved during the dropwise addition process, and the dropwise addition time was controlled within 2 hours. After the completion of dropwise addition, it was incubated for 1h; cool to 40℃, add 1 part of KH560 and stir uniformly, finally get solvent type acrylate pressure sensitive adhesive.

[0050] After testing, the performance of the pressure-sensitive adhesive is: initial adhesion is 15# steel ball, 180° peel strength is 0.8 kN / m, low temperature adhesion is >5 days, and 60℃ adhesion is >4h.

[0051] KH570 5% Preparation of solvent-based acrylic pressure-sensitive adhesive: Weigh 100 parts of a monomer mixture consisting of 55 parts isooctyl acrylate, 20 parts butyl acrylate, 3 parts ethyl acrylate, 17 parts methyl methacrylate, and 5 parts KH570. Add 30 parts of the monomer mixture, 5 parts KH570, 60 parts of ethyl acetate, and 0.1 part of azobisisobutyronitrile to a four-necked flask and react at 78°C with a stirring rate of 300 r / min for 1 hour. Then, slowly add the remaining 70 parts of the acrylic acid monomer mixture, 70 parts of ethyl acetate, and 0.1 part of azobisisobutyronitrile to the reaction system dropwise, allowing the monomers to react continuously. The addition time is controlled to 3 hours. After the addition is complete, the reaction is maintained at this temperature for another 1 hour. Finally, slowly add 0.3 parts of azobisisobutyronitrile and 20 parts of ethyl acetate to the reaction system dropwise, allowing the monomer conversion rate to increase continuously. The addition time is controlled to 2 hours. After the addition is completed, the mixture is kept warm for 1 hour; the temperature is lowered to 40°C, KH560 is added and stirred evenly, and finally a solvent-based acrylic pressure-sensitive adhesive is obtained.

[0052] After testing, the performance of the pressure-sensitive adhesive is: initial adhesion is 15# steel ball, 180° peel strength is 0.33 kN / m, low temperature adhesion is >3 days, and 60℃ adhesion is 6min.

[0053] KH570 15% Preparation of solvent-based acrylic pressure-sensitive adhesive: Weigh 100 parts of a monomer mixture consisting of 50 parts of isooctyl acrylate, 15 parts of butyl acrylate, 3 parts of ethyl acrylate, 17 parts of methyl methacrylate, and 15 parts of KH570. Add 30 parts of the monomer mixture, 15 parts of KH570, 60 parts of ethyl acetate, and 0.1 part of azobisisobutyronitrile to a four-necked flask and react at 78°C with a stirring rate of 300 r / min for 1 hour. Then, slowly add the remaining 70 parts of the acrylic acid monomer mixture, 70 parts of ethyl acetate, and 0.1 part of azobisisobutyronitrile to the reaction system dropwise, allowing the monomers to react continuously during the addition. The addition time is controlled to 3 hours. After the addition is complete, the reaction is maintained at this temperature for another 1 hour. Finally, slowly add 0.3 parts of azobisisobutyronitrile and 20 parts of ethyl acetate to the reaction system dropwise, allowing the monomer conversion rate to increase continuously during the addition. The addition time is controlled to 2 hours. After the addition is completed, the mixture is kept warm for 1 hour; the temperature is lowered to 40°C, KH560 is added and stirred evenly, and finally a solvent-based acrylic pressure-sensitive adhesive is obtained.

[0054] After testing, the performance of the pressure-sensitive adhesive is: initial adhesion is 19# steel ball, 180° peel strength is 0.21 kN / m, low temperature adhesion is >3 days, and 60℃ adhesion is 2min.

[0055] T g =-93℃ Add 10% polyurethane Preparation of solvent-based polyurethane-modified acrylate pressure-sensitive adhesive: First, synthesize a polyurethane prepolymer. Add MDI-50, polyether polyol 220, and diethylene glycol to a four-necked flask and stir at 80°C and 300 rpm for 1 hour. Then, add dimethylolpropionic acid dissolved in N-methylpyrrolidone and dilute with ethyl acetate. Continue stirring at 80°C and 300 rpm for 1 hour, and cool to room temperature to obtain the polyurethane prepolymer. Next, prepare a mixed monomer: weigh 27.5 parts of isooctyl acrylate, 10 parts of butyl acrylate, 1.5 parts of ethyl acrylate, 8.5 parts of methyl methacrylate, 1 part of hydroxyethyl acrylate, and 1.5 parts of acrylic acid, stir well, and set aside. Then, prepare a base solution a: weigh 15 parts by weight of the mixed monomer, 7.4 parts of the polyurethane prepolymer, 1 part of hydroxyethyl methacrylate, and 0.001 part of an organotin catalyst into a 500 mL four-necked flask. Stir at 300 rpm and react at 80°C for 3 hours to obtain base solution a. Then, prepare mixed solution b by weighing 0.1 parts of azobisisobutyronitrile and dissolving it in 30 parts of ethyl acetate, and add it dropwise to the flask within 2 hours. Prepare mixed solution c by weighing 35 parts of the remaining mixed monomers, 35 parts of ethyl acetate, and 0.05 parts of azobisisobutyronitrile, mix them, add them dropwise to the flask within 2 hours, and continue to react for 1 hour. Then prepare mixed solution d by weighing 0.1 parts of azobisisobutyronitrile and dissolving it in 20 parts of ethyl acetate, add them dropwise to the flask within 1 hour, and continue to react for 1 hour. Finally, weigh 0.5 parts of pentaerythritol tetraacrylate and add it to mixed solution d, react for 1 hour, cool to room temperature, add crosslinking agent KH560, stir evenly, and discharge to obtain a high-performance solvent-based polyurethane modified acrylate pressure-sensitive adhesive.

[0056] After testing, the performance of the pressure-sensitive adhesive is: initial adhesion is 15# steel ball, 180° peel strength is 1.54 kN / m, low temperature adhesion is >5 days, and 60℃ adhesion is >3h.

[0057] T g =-93℃ Add 30% polyurethane Preparation of a solvent-based polyurethane-modified acrylate pressure-sensitive adhesive: First, synthesize a polyurethane prepolymer. Add MDI-50, polyether polyol 220, and diethylene glycol to a four-necked flask and stir at 80°C and 300 rpm for 1 hour. Then, add dimethylolpropionic acid dissolved in N-methylpyrrolidone and dilute with ethyl acetate. Continue stirring at 80°C and 300 rpm for 1 hour, then cool to room temperature to obtain the polyurethane prepolymer. Next, prepare a mixed monomer: weigh 27.5 parts of isooctyl acrylate, 10 parts of butyl acrylate, 1.5 parts of ethyl acrylate, 8.5 parts of methyl methacrylate, 1 part of hydroxyethyl acrylate, and 1.5 parts of acrylic acid. Stir thoroughly and set aside. Then, prepare a base solution a: weigh 15 parts by weight of the mixed monomer, 22 parts of the polyurethane prepolymer, 1 part of hydroxyethyl methacrylate, and 0.001 part of an organotin catalyst into a 500 mL four-necked flask. Stir at 300 rpm and react at 80°C for 3 hours to obtain base solution a. Then, prepare mixed solution b by weighing 0.1 parts of azobisisobutyronitrile and dissolving it in 30 parts of ethyl acetate, and add it dropwise to the flask within 2 hours. Prepare mixed solution c by weighing 35 parts of the remaining mixed monomers, 35 parts of ethyl acetate, and 0.05 parts of azobisisobutyronitrile, mix them, add them dropwise to the flask within 2 hours, and continue to react for 1 hour. Then prepare mixed solution d by weighing 0.1 parts of azobisisobutyronitrile and dissolving it in 20 parts of ethyl acetate, add them dropwise to the flask within 1 hour, and continue to react for 1 hour. Finally, weigh 0.5 parts of pentaerythritol tetraacrylate and add it to mixed solution d, react for 1 hour, cool to room temperature, add crosslinking agent KH560, stir evenly, and discharge to obtain a high-performance solvent-based polyurethane modified acrylate pressure-sensitive adhesive.

[0058] After testing, the performance of the pressure-sensitive adhesive is: initial adhesion is 20# steel ball, 180° peel strength is 1.91 kN / m, low temperature adhesion is >5 days, and 60℃ adhesion is >3h.

[0059] Performance of the embodiment and its comparative example

[0060] From the performance comparison and analysis of the examples and comparative examples, it can be clearly seen that the high-performance solvent-based polyurethane-modified acrylate pressure-sensitive adhesive of the present application exhibits significant advantages in multiple key performance indicators. In terms of initial adhesion, the initial adhesion of the pressure-sensitive adhesive in the examples is generally higher, such as the initial adhesion of examples 6 and 7 reaching 19# steel ball, which is much higher than the lower level of 4# steel ball (comparative example 4) and the like of some comparative examples, which indicates that the pressure-sensitive adhesive of the present application can combine with the adherend more quickly and firmly at the initial bonding. In terms of holding adhesion, the holding adhesion of examples 1 to 7 all exceeds 5 days, while the holding adhesion of comparative examples 14 and 15 is only 3 days, which shows that the pressure-sensitive adhesive of the present application can maintain more stable bonding performance during long-term use and is not prone to debonding. The comparison of peel strength also highlights the superiority of the product of the present application, the peel strength of example 7 is as high as 2.11 kN / m, while the peel strength of most of the comparative examples is lower than this value, such as the peel strength of comparative examples 14 and 15 is only 0.33 kN / m and 0.21 kN / m respectively, which reflects that the pressure-sensitive adhesive of the present application can provide more reliable bonding effect in the application scenario of high-strength bonding demand, and is not prone to peeling even when facing larger external force.

[0061] In addition, in terms of color and shelf life, the color of the product in the examples is stable, and the shelf life is as long as 6 months, while the shelf life of some comparative examples is shorter, such as the shelf life of comparative examples 14 and 15 is only one week, which shows that the pressure-sensitive adhesive of the present application has more advantages in storage stability, can maintain good appearance and performance for a long time, and reduces the problem of performance decline of the product caused by too long storage time. In summary of the above analysis, the pressure-sensitive adhesive of the present application is superior to the comparative examples in initial adhesion, holding adhesion, peel strength, color stability and shelf life, etc., fully proves its excellent performance in high-performance application scenarios, can better meet the strict requirements of multiple fields such as electronics, automobiles, buildings, packaging, etc., has significant market competitiveness and broad application prospect.

[0062] The technical means disclosed in the present application scheme is not limited to the technical means disclosed in the above embodiments, but also includes the technical solutions composed of any combination of the above technical features.

[0063] Note: 1. The performance of solvent-based acrylate pressure-sensitive adhesive is largely determined by the glass transition temperature (T g ) of acrylate copolymer. Generally, T g should be controlled between -50~-100℃. If T g is too high, the adhesion of the pressure-sensitive adhesive will not be enough, and if T g is too low, the cohesive force of the pressure-sensitive adhesive will not be enough and is prone to debonding. Generally, the T g of the copolymer can be preliminarily calculated according to the following Fox equation when selecting monomers:

[0064] wherein, W 1 , W 2 , …, W n are the mass percentages of each comonomer; T 1 , T 2 , T 3 , …, T n are the glass transition temperatures of each comonomer.

[0065] 2. Glass transition temperatures of common monomers and their homopolymers for acrylate-based pressure sensitive adhesives;

[0066] The technical means disclosed in the present application are not limited to the technical means disclosed in the above embodiments, and also include technical solutions composed of any combination of the above technical features.

Claims

1. A high-performance solvent-based polyurethane-modified acrylate pressure-sensitive adhesive, characterized by: The raw materials include, by weight, 10±0.05 parts of polyurethane prepolymer, including 3.84±0.05 parts of diphenylmethane diisocyanate MDI 50, 4.62±0.05 parts of polyether polyol 220, 0.58±0.05 parts of diethylene glycol, 0.96±0.05 parts of dimethylol propionic acid, 27.5±0.05 parts of isooctyl acrylate, 10±0.05 parts of butyl acrylate, 1.5±0.05 parts of ethyl acrylate, 8.5±0.05 parts of methyl methacrylate, 1±0.05 parts of hydroxyethyl acrylate, 1.5±0.05 parts of acrylic acid, 87±0.05 parts of ethyl acetate, 3±0.05 parts of N-methylpyrrolidone, 0.5±0.05 parts of pentaerythritol tetraacrylate, and crosslinking agent KH560. 1±0.05 parts, azobisisobutyronitrile 0.25±0.05 parts.

2. The high-performance solvent-based polyurethane-modified acrylate pressure-sensitive adhesive according to claim 1, characterized in that: The raw materials include, by weight, 10 parts of polyurethane prepolymer, including 3.84 parts of diphenylmethane diisocyanate MDI 50, 4.62 parts of polyether polyol 220, 0.58 parts of diethylene glycol, 0.96 parts of dihydroxymethylpropionic acid, 27.5 parts of isooctyl acrylate, 10 parts of butyl acrylate, 1.5 parts of ethyl acrylate, 8.5 parts of methyl methacrylate, 1 part of hydroxyethyl acrylate, 1.5 parts of acrylic acid, 87 parts of ethyl acetate, 3 parts of N-methylpyrrolidone, 0.5 part of pentaerythritol tetraacrylate, 1 part of crosslinking agent KH560, and 0.25 parts of azobisisobutyronitrile.

3. A method for preparing a high-performance solvent-based polyurethane-modified acrylate pressure-sensitive adhesive, characterized in that: The specific steps include: Step 1: Synthesis of polyurethane prepolymer: MDI-50, polyether polyol 220 and diethylene glycol were added to a four-necked flask, the temperature was controlled at 80°C, and the stirring speed was 300 r / min for 1 hour; dimethylol propionic acid dissolved in N-methylpyrrolidone was added and diluted with an appropriate amount of ethyl acetate, and the reaction was continued at 80°C and the stirring speed was 300 r / min for 1 hour; after the reaction was completed, the mixture was cooled to room temperature to obtain a polyurethane prepolymer for use; Step 2: Preparation of mixed monomers: Weigh the following raw materials: isooctyl acrylate, butyl acrylate, ethyl acrylate, methyl methacrylate, hydroxyethyl acrylate, and acrylic acid; stir the raw materials evenly to obtain a mixed monomer for later use; Step 3: Preparation of base liquid a: Select an acrylate mixture from the mixed monomers; then add the polyurethane prepolymer, hydroxyethyl methacrylate, and an organotin catalyst into a 500 mL four-necked flask; start electric stirring to mix evenly to prepare the base liquid; heat and continue the reaction to obtain base liquid a; Step 4: Preparation of mixed solution b: Dissolve azobisisobutyronitrile in ethyl acetate and place in a hydraulic funnel; then add the mixture dropwise evenly into a four-necked flask over 2 hours to obtain mixed solution b; Step 5: Preparation of mixed solution c: After uniform mixing of the acrylate mixture, ethyl acetate and azobisisobutyronitrile, the mixture was placed in a hydraulic funnel; the mixture was evenly added dropwise to the four-necked flask over 2 hours, and the reaction was continued for 1 hour to obtain mixed solution c; Step 6: Preparation of mixed solution d: Dissolve azobisisobutyronitrile in ethyl acetate and place in a hydraulic funnel; uniformly add dropwise to a four-necked flask over 1 hour, and continue the reaction for 1 hour to obtain mixed solution d; Step 7: Final preparation of pressure-sensitive adhesive: select pentaerythritol tetraacrylate and add it to mixed solution d; continue the reaction for 1 hour, then cool to room temperature; finally, add crosslinking agent KH560, stir evenly and discharge the mixture to obtain a high-performance solvent-based polyurethane modified acrylate pressure-sensitive adhesive.

4. The method for preparing a high-performance solvent-based acrylate pressure-sensitive adhesive according to claim 3, wherein: In step 2, the following raw materials are weighed in parts by weight: 27.5 parts of isooctyl acrylate, 10 parts of butyl acrylate, 1.5 parts of ethyl acrylate, 8.5 parts of methyl methacrylate, 1 part of hydroxyethyl acrylate, and 1.5 parts of acrylic acid; the raw materials are stirred evenly to obtain a mixed monomer for later use.

5. The method for preparing a high-performance solvent-based acrylate pressure-sensitive adhesive according to claim 3, wherein: Preparation of base liquid a in step 3: Weigh 15 parts by weight of an acrylate mixture from the mixed monomers; weigh 15 parts by weight of a polyurethane prepolymer, 1 part by weight of hydroxyethyl methacrylate, and 0.001 parts by weight of an organotin catalyst, and add them together into a 500 mL four-necked flask; start electric stirring and mix evenly at a speed of 300 rpm to obtain a base liquid; heat and maintain the temperature at 80° C., and continue the reaction for 3 hours to obtain a base liquid a.

6. The method for preparing a high-performance solvent-based acrylate pressure-sensitive adhesive according to claim 3, wherein: Preparation of mixed solution b in step 4: Weigh 0.1 parts by weight of azobisisobutyronitrile, dissolve it in 30 parts by weight of ethyl acetate, and put it into a hydraulic funnel; and evenly add it dropwise into a four-necked flask over 2 hours to obtain mixed solution b.

7. The method for preparing a high-performance solvent-based acrylic pressure-sensitive adhesive according to claim 3, wherein: Preparation of mixed solution c in step 5: weigh the remaining 35 parts by weight of the acrylate mixture, 35 parts by weight of ethyl acetate and 0.05 parts by weight of azobisisobutyronitrile, mix them evenly, and put them into a hydraulic funnel; add them dropwise evenly to the four-necked flask over 2 hours, and then continue the reaction for 1 hour to obtain mixed solution c.

8. The method for preparing a high-performance solvent-based acrylate pressure-sensitive adhesive according to claim 3, wherein: Preparation of mixed solution d in step 6: Weigh 0.1 parts by weight of azobisisobutyronitrile, dissolve it in 20 parts by weight of ethyl acetate, and place it in a hydraulic funnel; add it dropwise evenly into a four-necked flask within 1 hour, and continue the reaction for 1 hour to obtain mixed solution d.

9. The method for preparing a high-performance solvent-based acrylic pressure-sensitive adhesive according to claim 3, characterized in that: The final preparation of the pressure-sensitive adhesive in step 7 is as follows: 0.5 parts by weight of pentaerythritol tetraacrylate is weighed and added to the mixed solution d; after continuing the reaction for 1 hour, the mixture is cooled to room temperature; finally, a crosslinking agent KH560 is added, the mixture is stirred evenly, and then the mixture is discharged to obtain a high-performance solvent-based polyurethane-modified acrylate pressure-sensitive adhesive.

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