High-temperature-resistant and anti-corrosion acrylic acid double-sided adhesive tape and preparation method thereof

Abstract

The invention belongs to the technical field of double faced adhesive tape preparation, and particularly relates to a high-temperature-resistant and anti-corrosion acrylic acid double faced adhesive tape and a preparation method thereof.The acrylic acid double faced adhesive tape sequentially comprises a first release layer, a first modified acrylate pressure-sensitive adhesive layer, a PET base material layer, a second modified acrylate pressure-sensitive adhesive layer and a second release layer; one side of the PET base material layer is attached to the first release layer through the first modified acrylate pressure-sensitive adhesive layer, and the other side of the PET base material layer is attached to the second release layer through the second modified acrylate pressure-sensitive adhesive layer. The acrylic acid double faced adhesive tape is obtained through a light curing method, the preparation method is simple, raw materials are saved, and the acrylic acid double faced adhesive tape has the advantages of high stripping force, high temperature resistance and corrosion resistance.

Description

Technical Field

[0001] The invention belongs to the technical field of double-sided adhesive tape preparation, and particularly relates to a high-temperature resistant and corrosion-resistant acrylic double-sided adhesive tape and a preparation method thereof. Background Art

[0002] Pressure-sensitive adhesive (PSA) is a type of adhesive that is very sensitive to pressure and can be pasted with just a slight contact pressure without the need for heating or solvent activation. It is often made into pressure-sensitive adhesive tapes and sheets, and has the advantages of being easy and quick to apply, easy to stick and peel, and will not cause damage to equipment. Pressure-sensitive adhesives are generally divided into two categories: rubber type and synthetic resin type. Acrylic pressure-sensitive adhesives belong to the synthetic resin type. Because of its many advantages, it is in a leading position among pressure-sensitive adhesives and is the largest-produced variety of acrylic adhesives. It can be used for the pasting of various plastic films and metal foils, the pasting of metals and non-metallic materials, the pasting of metal or plastic nameplates, and the pasting of labels.

[0003] Patent CN116496731A discloses a flame retardant acrylic pressure-sensitive adhesive and a preparation method thereof. The invention provides a modified acrylic pressure-sensitive adhesive with a low Tg and a long side chain, and utilizes the flexibility of its long side chain to improve the coating effect of the acrylic pressure-sensitive adhesive on the solid powder flame retardant, thereby improving the problems of low initial adhesion and low peeling force of the acrylic flame retardant pressure-sensitive adhesive; and introduces a high softening point tackifier resin therein to improve the cohesive performance of the modified acrylic pressure-sensitive adhesive, and introduces a low softening point rosin resin to improve the initial adhesion performance of the modified acrylic, thereby obtaining a flame retardant acrylic pressure-sensitive adhesive with good flame retardant performance and balanced initial adhesion, peeling force, and cohesive force. Although the modified acrylic pressure-sensitive adhesive in the invention has a good flame retardant effect, its peeling force still cannot meet the requirements in some application fields and is limited, and it is unknown whether the modified acrylic pressure-sensitive adhesive can still maintain excellent comprehensive performance under high temperature conditions. In addition, the application in some special fields also requires the pressure-sensitive adhesive to have good corrosion resistance.

[0004] Based on the problems existing in the prior art, it is of practical significance to develop an acrylic pressure-sensitive adhesive with excellent high temperature resistance and corrosion resistance and high peeling force, and apply it to tapes. Summary of the invention

[0005] In view of the problems existing in the prior art, the present invention provides a high temperature resistant and corrosion resistant acrylic double-sided adhesive and a preparation method thereof. The acrylic double-sided adhesive is obtained by an ultraviolet light curing method, the preparation method is simple, saves raw materials, and has the advantages of high peeling force, high temperature resistance, and corrosion resistance.

[0006] In order to achieve the above object, the technical solution adopted by the present invention is as follows:

[0007] The first aspect of the present invention provides a high temperature resistant and corrosion resistant acrylic double-sided adhesive, the acrylic double-sided adhesive sequentially comprising a first release layer, a first modified acrylate pressure-sensitive adhesive layer, a PET substrate layer, a second modified acrylate pressure-sensitive adhesive layer, and a second release layer;

[0008] One side of the PET substrate layer is bonded to the first release layer via a first modified acrylate pressure-sensitive adhesive layer, and the other side of the PET substrate layer is bonded to the second release layer via a second modified acrylate pressure-sensitive adhesive layer;

[0009] The thickness of the PET substrate is 20-30 μm.

[0010] The second aspect of the present invention provides a method for preparing a high temperature resistant and corrosion resistant acrylic double-sided adhesive, comprising the following preparation steps:

[0011] The modified acrylate pressure-sensitive adhesive is coated on the first release layer to form a first modified acrylate pressure-sensitive adhesive layer with a thickness of 10-120 μm, which is laminated to one side of the PET substrate layer. The modified acrylate pressure-sensitive adhesive is then coated on the second release layer to form a second modified acrylate pressure-sensitive adhesive layer with a thickness of 10-120 μm, which is laminated to the other side of the PET substrate layer and cured to obtain the acrylic double-sided adhesive.

[0012] In some embodiments, the modified acrylate pressure-sensitive adhesive includes the following components in parts by mass: 70-80 parts of modified acrylate prepolymer, 15-25 parts of isobornyl acrylate, 1-10 parts of hydroxypropyl acrylate, 0.5-1.5 parts of epoxy curing agent, and 0.2-0.13 parts of photoinitiator.

[0013] In some embodiments, the preparation steps of the modified acrylate pressure-sensitive adhesive are as follows:

[0014] (1) dispersing graphene oxide in dimethylformamide, adding a mercaptosilane coupling agent after ultrasonic treatment, stirring at 80-90° C. for 0.5-1 h, filtering, washing, and drying to obtain modified graphene oxide;

[0015] (2) adding the modified graphene oxide and the photoinitiator of step (1) to the functionalized acrylate prepolymer under a nitrogen atmosphere at 0-4° C., and irradiating with an ultraviolet lamp while stirring to obtain a modified acrylate prepolymer;

[0016] (3) The modified acrylate prepolymer of step (2) is mixed evenly with isobornyl acrylate, hydroxypropyl acrylate, epoxy curing agent and photoinitiator, and defoamed under reduced pressure to obtain a modified acrylate pressure-sensitive adhesive.

[0017] In some embodiments, the amount of graphene oxide used in step (1) is 40-50wt% of the mercaptosilane coupling agent; and the average flake size of the graphene oxide is <300nm.

[0018] Preferably, the amount of graphene oxide used in step (1) is 45 wt % of the mercaptosilane coupling agent.

[0019] In some embodiments, the amount of modified graphene oxide used in step (2) is 0.05-0.2 wt % of the functionalized acrylate prepolymer.

[0020] Preferably, the amount of modified graphene oxide used in step (2) is 0.15 wt % of the functionalized acrylate prepolymer.

[0021] In some embodiments, the mass ratio of the modified acrylate prepolymer, isobornyl acrylate and hydroxypropyl acrylate in step (3) is (12-13):(3-4):1.

[0022] Preferably, in step (3), the mass ratio of the modified acrylate prepolymer, isobornyl acrylate and hydroxypropyl acrylate is 12.5:3.5:1.

[0023] In some embodiments, the preparation steps of the functionalized acrylate prepolymer are as follows:

[0024] Acrylic acid, butyl acrylate, propargyl acrylate and 2,4,6-trimethylbenzoyl-diphenylphosphine oxide are mixed, and nitrogen is passed through the mixture for 5-10 minutes while stirring. The mixture is then intermittently irradiated with an ultraviolet lamp to control the reaction temperature. When the reaction system becomes viscous enough to slightly climb a pole, the irradiation is stopped, and air is introduced to terminate the reaction to obtain a functionalized acrylate prepolymer.

[0025] In some embodiments, the molar ratio of acrylic acid, butyl acrylate and propynyl acrylate is (5-10):(90-95):(1-3).

[0026] Preferably, the molar ratio of acrylic acid, butyl acrylate and propynyl acrylate is 8:92:2.1.

[0027] In some embodiments, the reaction temperature is controlled at 60-65°C.

[0028] The present invention uses acrylic acid, butyl acrylate and propargyl acrylate as raw materials, prepares a solvent-free acrylic acid prepolymer by a photopolymerization method, then adds isobornyl acrylate and hydroxypropyl acrylate as hard monomers, and photocures again to prepare a high-performance modified acrylic pressure-sensitive adhesive. Among them, butyl acrylate is a common monomer of acrylic pressure-sensitive adhesive, and has a low Tg, leaving room for performance adjustment for adding a high-Tg functional monomer in the second photocuring, acrylic acid is a polar monomer, and the addition of an appropriate amount can improve the adhesion of the pressure-sensitive adhesive to a polar substrate, and propargyl acrylate is an alkynyl functional monomer, which plays a role in regulating the photopolymerization reaction and improving the cohesion and peeling force of the pressure-sensitive adhesive.

[0029] The present invention prepares a modified acrylic pressure-sensitive adhesive by introducing propargyl acrylate into the system. Since propargyl acrylate has the effect of attenuating chain transfer, the photo-radical copolymerization speed of the mixed monomer of acrylic acid, butyl acrylate and propargyl acrylate is controlled by controlling the amount of propargyl acrylate added, so as to form an acrylic polymer with a molecular weight suitable for making a pressure-sensitive adhesive, and a part of the alkynyl groups on the polymer side chain will participate in the free radical reaction, and branched products will be formed during the photopolymerization process, which is beneficial to improving the comprehensive performance of the modified acrylic pressure-sensitive adhesive. The applicant of the present invention has found that the reaction is stopped after the viscosity of the prepolymer formed by the polymerization reaction increases significantly, so that a prepolymer with good fluidity and no gel can be obtained, which is beneficial to the next step of photocuring operation.

[0030] In addition, the present invention uses a mercaptosilane coupling agent to modify graphene oxide, while improving the compatibility and dispersibility of graphene oxide with acrylate prepolymer, it also makes its surface rich in mercapto groups, under the action of photocatalysis, the mercapto groups on the surface of graphene oxide and the alkyne groups in the acrylate prepolymer can react chemically, and the modified graphene oxide is introduced into the prepolymer, and the prepared modified acrylate pressure-sensitive adhesive has good stability, high temperature resistance and corrosion resistance. This is because the graphene oxide in the modified acrylate pressure-sensitive adhesive can effectively reduce the gap between the pressure-sensitive adhesives, improve the compactness, and thus improve its corrosion resistance; the graphene oxide is evenly dispersed in the pressure-sensitive adhesive system, so that the system stress distribution is uniform, thereby improving the tensile strength; the use of graphene oxide can also significantly reduce the micro-damage of the pressure-sensitive adhesive after high temperature, enhance its integrity and bearing capacity after high temperature, and improve the high temperature resistance of the pressure-sensitive adhesive.

[0031] Compared with the prior art, the present invention has the following beneficial effects:

[0032] 1. The present invention provides a high temperature resistant and corrosion resistant acrylic double-sided adhesive and a preparation method thereof. The acrylic double-sided adhesive uses acrylic acid, butyl acrylate, and propargyl acrylate as raw materials, prepares a solvent-free acrylic prepolymer by a photopolymerization method, then adds an appropriate amount of hard monomer, and prepares a high-performance modified acrylic pressure-sensitive adhesive by photocuring again. The preparation method of the acrylic double-sided adhesive made of the modified acrylic pressure-sensitive adhesive is simple, saves raw materials, and has the advantages of high peeling force, high temperature resistance, and corrosion resistance.

[0033] 2. The present invention introduces propargyl acrylate with attenuated chain transfer effect into the pressure-sensitive adhesive, controls the speed of photo-free radical copolymerization of the mixed monomer by controlling the amount of the acrylate added, and forms an acrylate polymer with suitable molecular weight, good fluidity and no gel, which can improve the cohesion and peeling force of the pressure-sensitive adhesive.

[0034] 3. The present invention uses a mercaptosilane coupling agent to modify graphene oxide, which improves the compatibility and dispersibility of graphene oxide with acrylate prepolymers and enriches its surface with mercapto groups. Under the action of photocatalysis, the mercapto groups react chemically with the alkyne groups in the acrylate prepolymers. The prepared modified acrylate pressure-sensitive adhesive has good stability, high temperature resistance and corrosion resistance. DETAILED DESCRIPTION

[0035] The present invention will be described below in conjunction with specific embodiments. It should be noted that the following embodiments are examples of the present invention and are only used to illustrate the present invention, but not to limit the present invention. Other combinations and various modifications within the concept of the present invention may be performed without departing from the spirit or scope of the present invention.

[0036] The mercaptosilane coupling agent used in the present invention is 3-mercaptopropyltrimethoxysilane; the photoinitiator used is photoinitiator TPO; the average flake size of the graphene oxide used is <300nm, purchased from Zhongke Yueda (Shanghai) Materials Technology Co., Ltd.; the epoxy curing agent used is a water-based epoxy curing agent purchased from Zhejiang Anbang New Materials Development Co., Ltd. with the product number AB-HGA-50; the PET substrate layer used is purchased from Suzhou Guer Packaging Materials Co., Ltd.; the release layer used is a PET standard series release film layer purchased from TTS Taides.

[0037] Preparation Example 1

[0038] The preparation steps of functionalized acrylate prepolymer are as follows:

[0039] 0.08 mol of acrylic acid, 0.92 mol of butyl acrylate, 0.021 mol of propargyl acrylate and 0.2 g of 2,4,6-trimethylbenzoyl-diphenylphosphine oxide were mixed, and the air was exhausted by nitrogen gas for 10 minutes while stirring. Then, an ultraviolet lamp was intermittently irradiated at a wavelength of 365 nm, and the reaction temperature was controlled at 65°C. When the reaction system became viscous to the point of slightly climbing a pole, the illumination was stopped, and air was introduced to terminate the reaction to obtain a functionalized acrylate prepolymer.

[0040] Preparation Example 2

[0041] The preparation steps of functionalized acrylate prepolymer are as follows:

[0042] 0.04 mol of acrylic acid, 0.92 mol of butyl acrylate, 0.021 mol of propargyl acrylate and 0.2 g of 2,4,6-trimethylbenzoyl-diphenylphosphine oxide were mixed, and the air was exhausted by nitrogen gas for 10 minutes while stirring. Then, an ultraviolet lamp was intermittently irradiated at a wavelength of 365 nm, and the reaction temperature was controlled at 65°C. When the reaction system became viscous to the point of slightly climbing a pole, the illumination was stopped, and air was introduced to terminate the reaction to obtain a functionalized acrylate prepolymer.

[0043] Preparation Example 3

[0044] The preparation steps of functionalized acrylate prepolymer are as follows:

[0045] Mix 0.08 mol of acrylic acid, 0.92 mol of butyl acrylate and 0.2 g of 2,4,6-trimethylbenzoyl-diphenylphosphine oxide, and exhaust the air with nitrogen for 10 minutes while stirring. Then, intermittently irradiate with an ultraviolet lamp at a wavelength of 365 nm, and control the reaction temperature to 65°C. When the reaction system becomes viscous to the point of slightly climbing a pole, stop irradiating with light, introduce air to terminate the reaction, and obtain a functionalized acrylate prepolymer.

[0046] Preparation Example 4

[0047] The preparation steps of modified acrylic pressure-sensitive adhesive are as follows:

[0048] (1) 4.5 g of graphene oxide was dispersed in 50 mL of dimethylformamide, and 10 g of mercaptosilane coupling agent was added after ultrasonic treatment at 25 kHz for 10 min. After stirring at 85 ° C for 1 h, the mixture was filtered, washed with pure water for 3 times, and dried at 60 ° C to constant weight to obtain modified graphene oxide;

[0049] (2) in a nitrogen atmosphere at 0° C., adding 0.15 g of the modified graphene oxide prepared in step (1) and 0.3 g of a photoinitiator to 100 g of a functionalized acrylate prepolymer, and irradiating the mixture with an ultraviolet lamp at a wavelength of 365 nm for 1 h while stirring to obtain a modified acrylate prepolymer;

[0050] (3) 50 g of the modified acrylate prepolymer prepared in step (2) was mixed evenly with 14 g of isobornyl acrylate, 4 g of hydroxypropyl acrylate, 0.8 g of epoxy curing agent, and 0.25 g of photoinitiator, and the mixture was decompressed and defoamed to obtain a modified acrylate pressure-sensitive adhesive.

[0051] The functionalized acrylate prepolymer used is obtained from Preparation Example 1.

[0052] Preparation Example 5

[0053] The preparation steps of the modified acrylate pressure-sensitive adhesive are the same as those of Preparation Example 4, except that the functionalized acrylate prepolymer used is obtained from Preparation Example 2.

[0054] Preparation Example 6

[0055] The preparation steps of the modified acrylate pressure-sensitive adhesive are the same as those of Preparation Example 4, except that the functionalized acrylate prepolymer used is obtained from Preparation Example 3.

[0056] Preparation Example 7

[0057] The preparation steps of modified acrylic pressure-sensitive adhesive are as follows:

[0058] (1) 3.5 g of graphene oxide was dispersed in 50 mL of dimethylformamide, and 10 g of mercaptosilane coupling agent was added after ultrasonic treatment at 25 kHz for 10 min. After stirring at 85 ° C for 1 h, the mixture was filtered, washed with pure water for 3 times, and dried at 60 ° C to constant weight to obtain modified graphene oxide;

[0059] (2) in a nitrogen atmosphere at 0° C., adding 0.15 g of the modified graphene oxide prepared in step (1) and 0.3 g of a photoinitiator to 100 g of a functionalized acrylate prepolymer, and irradiating the mixture with an ultraviolet lamp at a wavelength of 365 nm for 1 h while stirring to obtain a modified acrylate prepolymer;

[0060] (3) 50 g of the modified acrylate prepolymer prepared in step (2) was mixed evenly with 14 g of isobornyl acrylate, 4 g of hydroxypropyl acrylate, 0.8 g of epoxy curing agent, and 0.25 g of photoinitiator, and the mixture was decompressed and defoamed to obtain a modified acrylate pressure-sensitive adhesive.

[0061] The functionalized acrylate prepolymer used is obtained from Preparation Example 1.

[0062] Preparation Example 8

[0063] The preparation steps of modified acrylic pressure-sensitive adhesive are as follows:

[0064] (1) 4.5 g of graphene oxide was dispersed in 50 mL of dimethylformamide, and 10 g of mercaptosilane coupling agent was added after ultrasonic treatment at 25 kHz for 10 min. After stirring at 85 ° C for 1 h, the mixture was filtered, washed with pure water for 3 times, and dried at 60 ° C to constant weight to obtain modified graphene oxide;

[0065] (2) in a nitrogen atmosphere at 0° C., adding 0.25 g of the modified graphene oxide prepared in step (1) and 0.3 g of a photoinitiator to 100 g of a functionalized acrylate prepolymer, and irradiating the mixture with an ultraviolet lamp at a wavelength of 365 nm for 1 h while stirring to obtain a modified acrylate prepolymer;

[0066] (3) 50 g of the modified acrylate prepolymer prepared in step (2) was mixed evenly with 14 g of isobornyl acrylate, 4 g of hydroxypropyl acrylate, 0.8 g of epoxy curing agent, and 0.25 g of photoinitiator, and the mixture was decompressed and defoamed to obtain a modified acrylate pressure-sensitive adhesive.

[0067] The functionalized acrylate prepolymer used is obtained from Preparation Example 1.

[0068] Preparation Example 9

[0069] The preparation steps of modified acrylic pressure-sensitive adhesive are as follows:

[0070] (1) 4.5 g of graphene oxide was dispersed in 50 mL of dimethylformamide, and 10 g of mercaptosilane coupling agent was added after ultrasonic treatment at 25 kHz for 10 min. After stirring at 85 ° C for 1 h, the mixture was filtered, washed with pure water for 3 times, and dried at 60 ° C to constant weight to obtain modified graphene oxide;

[0071] (2) in a nitrogen atmosphere at 0° C., adding 0.15 g of the modified graphene oxide prepared in step (1) and 0.3 g of a photoinitiator to 100 g of a functionalized acrylate prepolymer, and irradiating the mixture with an ultraviolet lamp at a wavelength of 365 nm for 1 h while stirring to obtain a modified acrylate prepolymer;

[0072] (3) 50 g of the modified acrylate prepolymer prepared in step (2) was mixed evenly with 14 g of isobornyl acrylate, 0.8 g of epoxy curing agent, and 0.25 g of photoinitiator, and the mixture was decompressed and defoamed to obtain a modified acrylate pressure-sensitive adhesive.

[0073] The functionalized acrylate prepolymer used is obtained from Preparation Example 1.

[0074] Preparation Example 10

[0075] The preparation steps of modified acrylic pressure-sensitive adhesive are as follows:

[0076] (1) adding 0.15 g of graphene oxide to 100 g of functionalized acrylate prepolymer under a nitrogen atmosphere at 0° C. and mixing well to obtain a modified acrylate prepolymer;

[0077] (2) 50 g of the modified acrylate prepolymer prepared in step (1) was mixed evenly with 14 g of isobornyl acrylate, 4 g of hydroxypropyl acrylate, 0.8 g of epoxy curing agent, and 0.25 g of photoinitiator, and the mixture was decompressed and defoamed to obtain a modified acrylate pressure-sensitive adhesive.

[0078] The functionalized acrylate prepolymer used is obtained from Preparation Example 1.

[0079] Preparation Example 11

[0080] The preparation steps of acrylic pressure-sensitive adhesive are as follows:

[0081] 50 g of the functionalized acrylate prepolymer obtained in Preparation Example 1 was mixed evenly with 14 g of isobornyl acrylate, 4 g of hydroxypropyl acrylate, 0.8 g of epoxy curing agent, and 0.25 g of photoinitiator, and defoamed under reduced pressure to obtain an acrylic pressure-sensitive adhesive.

[0082] The functionalized acrylate prepolymer used is obtained from Preparation Example 1.

[0083] Example 1

[0084] A method for preparing a high temperature resistant and corrosion resistant acrylic double-sided adhesive comprises the following preparation steps:

[0085] The modified acrylate pressure-sensitive adhesive was evenly coated on the first release layer to form a first modified acrylate pressure-sensitive adhesive layer with a thickness of 60 μm, which was laminated to one side of the PET substrate layer. The modified acrylate pressure-sensitive adhesive was then evenly coated on the second release layer to form a second modified acrylate pressure-sensitive adhesive layer with a thickness of 60 μm, which was laminated to the other side of the PET substrate layer. The modified acrylate pressure-sensitive adhesive was then evenly coated on the second release layer to form a second modified acrylate pressure-sensitive adhesive layer with a thickness of 60 μm, which was laminated to the other side of the PET substrate layer. 2 The mixture was cured under a medium-pressure mercury lamp for 10 minutes to obtain the acrylic double-sided adhesive.

[0086] The modified acrylate pressure-sensitive adhesive used is obtained from Preparation Example 4.

[0087] Example 2

[0088] A method for preparing a high temperature resistant and corrosion resistant acrylic double-sided adhesive. The specific implementation method is the same as that of Example 1, except that the modified acrylic pressure-sensitive adhesive used is obtained from Preparation Example 5.

[0089] Example 3

[0090] A method for preparing a high temperature resistant and corrosion resistant acrylic double-sided adhesive, the specific implementation method is the same as that of Example 1, except that the modified acrylic pressure-sensitive adhesive used is obtained from Preparation Example 6.

[0091] Example 4

[0092] A method for preparing a high temperature resistant and corrosion resistant acrylic double-sided adhesive. The specific implementation method is the same as that of Example 1, except that the modified acrylic pressure-sensitive adhesive used is obtained from Preparation Example 7.

[0093] Example 5

[0094] A method for preparing a high temperature resistant and corrosion resistant acrylic double-sided adhesive. The specific implementation method is the same as that of Example 1, except that the modified acrylic pressure-sensitive adhesive used is obtained from Preparation Example 8.

[0095] Example 6

[0096] A method for preparing a high temperature resistant and corrosion resistant acrylic double-sided adhesive, the specific implementation method is the same as that of Example 1, except that the modified acrylic pressure-sensitive adhesive used is obtained from Preparation Example 9.

[0097] Example 7

[0098] A method for preparing a high temperature resistant and corrosion resistant acrylic double-sided adhesive. The specific implementation method is the same as that of Example 1, except that the modified acrylic pressure-sensitive adhesive used is obtained from Preparation Example 10.

[0099] Comparative Example 1

[0100] A method for preparing an acrylic double-sided adhesive tape comprises the following steps:

[0101] The acrylic pressure-sensitive adhesive was evenly coated on the first release layer to form a first acrylic pressure-sensitive adhesive layer with a thickness of 60 μm, which was laminated to one side of the PET substrate layer. The acrylic pressure-sensitive adhesive was then evenly coated on the second release layer to form a second acrylic pressure-sensitive adhesive layer with a thickness of 60 μm, which was laminated to the other side of the PET substrate layer. The pressure-sensitive adhesive was placed at 50 mW / cm 2 The mixture was cured under a medium-pressure mercury lamp for 10 minutes to obtain the acrylic double-sided adhesive.

[0102] The acrylic pressure-sensitive adhesive used was obtained from Preparation Example 11.

[0103] Performance test of acrylic double-sided tape

[0104] The following performance tests were performed on the acrylic double-sided adhesives obtained in the examples and comparative examples:

[0105] On the basis of GB / T2792-2014, with reference to patent CN116496731A, the 180° peeling force of the acrylic double-sided adhesive obtained in the embodiment and the comparative example at 25°C, 120°C and after immersion in different media (60°C / 7d) at 25°C was tested; the specific results are shown in Table 1.

[0106] Table 1

[0107]

[0108] As shown in Table 1, the acrylic double-sided adhesive prepared in Example 1 has the best comprehensive performance and the highest peeling force at high temperature and in different media, which reflects that the acrylic double-sided adhesive prepared in the present invention has good high temperature resistance and corrosion resistance.

[0109] Compared with Example 1, the preparation conditions of the modified acrylic pressure-sensitive adhesive used in Examples 2 and 3 are changed, wherein the raw materials and raw material ratios of the functionalized acrylic prepolymer are changed, resulting in a decrease in the comprehensive performance of the functionalized acrylic prepolymer, thereby reducing the high temperature resistance and corrosion resistance of the acrylic double-sided adhesives prepared in Examples 2 and 3; in the preparation process of the modified acrylic pressure-sensitive adhesive used in Examples 4-6, the amounts of graphene oxide, modified graphene oxide, and acrylate isobornyl are changed respectively, resulting in changes in the stability, high temperature resistance, and corrosion resistance of the acrylic double-sided adhesive; in the preparation process of the modified acrylic pressure-sensitive adhesive used in Example 7, no coupling agent is used to modify graphene oxide, resulting in poor compatibility and dispersibility with the acrylic prepolymer, thereby affecting the performance of the modified acrylic pressure-sensitive adhesive and the acrylic double-sided adhesive; in the preparation process of the modified acrylic pressure-sensitive adhesive used in Comparative Example 1, the functionalized acrylate prepolymer used has not been modified by modified graphene oxide, and the performance of the pressure-sensitive adhesive, such as integrity and bearing capacity after high temperature, cannot be improved, which significantly weakens the performance of the acrylic double-sided adhesive.

[0110] The above description is only a preferred embodiment of the present invention and does not limit the present invention in any form. Although the present invention has been disclosed as a preferred embodiment as above, it is not used to limit the present invention. Any technician familiar with this profession can make some changes or modifications to equivalent embodiments of equivalent changes using the technical contents disclosed above without departing from the scope of the technical solution of the present invention. However, any simple modification, equivalent change and modification made to the above embodiments based on the technical essence of the present invention without departing from the content of the technical solution of the present invention still fall within the scope of the technical solution of the present invention.

Claims

1. A high temperature resistant and corrosion resistant acrylic double-sided adhesive, characterized in that: The acrylic double-sided adhesive tape comprises in sequence a first release layer, a first modified acrylic pressure-sensitive adhesive layer, a PET substrate layer, a second modified acrylic pressure-sensitive adhesive layer, and a second release layer; One side of the PET substrate layer is bonded to the first release layer via a first modified acrylate pressure-sensitive adhesive layer, and the other side of the PET substrate layer is bonded to the second release layer via a second modified acrylate pressure-sensitive adhesive layer; The thickness of the PET substrate is 20-30 μm.

2. A method for preparing the acrylic double-sided adhesive according to claim 1, characterized in that: The method comprises the following preparation steps: The modified acrylate pressure-sensitive adhesive is coated on the first release layer to form a first modified acrylate pressure-sensitive adhesive layer with a thickness of 10-120 μm, which is laminated to one side of the PET substrate layer. The modified acrylate pressure-sensitive adhesive is then coated on the second release layer to form a second modified acrylate pressure-sensitive adhesive layer with a thickness of 10-120 μm, which is laminated to the other side of the PET substrate layer and cured to obtain the acrylic double-sided adhesive.

3. The method for preparing the acrylic double-sided adhesive according to claim 2, characterized in that: The modified acrylate pressure-sensitive adhesive comprises the following components, calculated by weight: 70-80 parts of modified acrylate prepolymer, 15-25 parts of isobornyl acrylate, 1-10 parts of hydroxypropyl acrylate, 0.5-1.5 parts of epoxy curing agent, and 0.2-0.13 parts of photoinitiator.

4. The method for preparing the acrylic double-sided adhesive according to claim 3, characterized in that: The preparation steps of the modified acrylate pressure-sensitive adhesive are as follows: (1) dispersing graphene oxide in dimethylformamide, adding a mercaptosilane coupling agent after ultrasonic treatment, stirring at 80-90° C. for 0.5-1 h, filtering, washing, and drying to obtain modified graphene oxide; (2) adding the modified graphene oxide and the photoinitiator of step (1) to the functionalized acrylate prepolymer under a nitrogen atmosphere at 0-4° C., and irradiating with an ultraviolet lamp while stirring to obtain a modified acrylate prepolymer; (3) The modified acrylate prepolymer of step (2) is mixed evenly with isobornyl acrylate, hydroxypropyl acrylate, epoxy curing agent and photoinitiator, and defoamed under reduced pressure to obtain a modified acrylate pressure-sensitive adhesive.

5. The method for preparing the acrylic double-sided adhesive according to claim 4, characterized in that: The amount of graphene oxide used in step (1) is 40-50wt% of the mercaptosilane coupling agent; the average flake size of the graphene oxide is <300nm.

6. The method for preparing the acrylic double-sided adhesive according to claim 5, characterized in that: The amount of modified graphene oxide used in step (2) is 0.05-0.2 wt % of the functionalized acrylate prepolymer.

7. The method for preparing the acrylic double-sided adhesive according to claim 6, characterized in that: In the step (3), the mass ratio of the modified acrylate prepolymer, isobornyl acrylate and hydroxypropyl acrylate is (12-13):(3-4):

1.

8. The method for preparing the acrylic double-sided adhesive according to claim 4, characterized in that: The preparation steps of the functionalized acrylate prepolymer are as follows: Acrylic acid, butyl acrylate, propargyl acrylate and 2,4,6-trimethylbenzoyl-diphenylphosphine oxide are mixed, and nitrogen is passed through the mixture for 5-10 minutes while stirring. Then, an ultraviolet lamp is used for intermittent irradiation to control the reaction temperature. When the reaction system becomes viscous to the point of slightly climbing a pole, the irradiation is stopped, and air is introduced to terminate the reaction to obtain a functionalized acrylate prepolymer.

9. The method for preparing the acrylic double-sided adhesive according to claim 8, characterized in that: The molar ratio of acrylic acid, butyl acrylate and propynyl acrylate is (5-10):(90-95):(1-3).

10. The method for preparing the acrylic double-sided adhesive according to claim 8, characterized in that: The reaction temperature is controlled at 60-65°C.

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