A UV-resistant and acid-resistant tape for flexible glass thinning and its preparation process

Abstract

This application relates to the technical field of adhesive tapes, specifically disclosing a UV-resistant, acid-resistant tape for flexible glass thinning and its preparation process. A UV-resistant, acid-resistant tape for flexible glass thinning comprises a substrate layer, a pressure-sensitive adhesive layer, and a release film layer stacked sequentially. The pressure-sensitive adhesive layer is prepared from the following raw materials: 85-120 parts by weight of an acrylate copolymer, 3-5 parts by weight of a crosslinking agent, 1.5-2.5 parts by weight of a photoinitiator, 2-5 parts by weight of an acid-resistant nanofiller, and 0.2-0.4 parts by weight of an amine catalyst. The acrylate copolymer is prepared from the following raw materials: 20-30 parts by weight of an imidazoline monomer, 15-25 parts by weight of a sterically hindered alkyl monomer, 45-55 parts by weight of a flexible monomer, and 5-10 parts by weight of a carboxyl monomer. The UV-resistant, acid-resistant tape obtained in this application exhibits good acid resistance and a reliable balance between UV tack reduction and high initial adhesion.

Description

Technical Field

[0001] This application relates to the technical field of adhesive tapes, and more specifically, to UV anti-adhesive and acid-resistant adhesive tapes for flexible glass thinning and their preparation process. Background Technology

[0002] In the glass thinning process, a mixture of acids such as nitric acid, hydrofluoric acid, and hydrochloric acid is used to corrode the glass. The side that does not need to be thinned is sealed with an acid-resistant film, while the side that needs to be thinned is chemically thinned from 200μm to 30~50μm by acid spraying. Existing protective tapes or acid-resistant films face two major challenges in the thinning process of ultra-thin flexible glass: First, it is difficult to maintain stable adhesion and integrity for a long time in a strong acid environment (especially hydrofluoric acid), and acid penetration can easily lead to protection failure and glass corrosion; second, ordinary acid-resistant tapes rely on a highly cross-linked dense structure to achieve acid resistance, and after thinning, it is difficult to achieve non-damaging, low-stress peeling from ultra-thin glass with extremely low mechanical strength.

[0003] Patent application CN111793449A discloses a UV-curable heat-resistant adhesive layer composition, comprising: (I) acrylic resin; (II) thermally expandable microspheres, accounting for 6.5-16.6 wt% of the acrylic resin; (III) a polymerization initiator, accounting for 0.1-2.5 wt% of the acrylic resin; wherein the acrylic resin is formed by (c) acrylic monomers without active groups with a weight average molecular weight of 200-800 g / mol; (d) acrylic monomers containing active groups with a weight average molecular weight of 150-650 g / mol; and (e) diisocyanate, wherein the active groups are reactive functional groups.

[0004] In this technical solution, the core system consists of acrylic resins with different weight-average molecular weights and thermally expandable microspheres. However, its density suffers from structural deficiencies, specifically stemming from: First, the acrylic resins are composed of low-molecular-weight monomers, which, while promoting rapid cross-linking, result in short molecular chain segments, leading to numerous local pores and defects in the constructed three-dimensional network structure. Second, the acrylic monomers in the formulation, lacking active groups, rely solely on physical entanglement, lacking stable chemical cross-linking, further exacerbating the looseness of the network structure. Third, the thermally expandable microspheres, a key component for reducing viscosity, have a micron-scale structure, much larger than the nanometer-scale resin molecular chains, making it difficult to achieve tight interfacial bonding and effective space filling, essentially introducing more structural pores. This lack of structural density directly results in poor acid resistance. Summary of the Invention

[0005] In order to overcome the acid resistance defects caused by the insufficient density of existing tape structures, and to balance the technical problems of initial high adhesion and subsequent UV adhesion reduction, this application provides a UV adhesion reduction and acid resistance tape for flexible glass thinning and its preparation process.

[0006] In a first aspect, this application provides a UV-resistant and acid-resistant tape for flexible glass thinning, employing the following technical solution:

[0007] A UV-resistant and acid-resistant tape for flexible glass thinning comprises a substrate layer, a pressure-sensitive adhesive layer, and a release film layer stacked sequentially. The pressure-sensitive adhesive layer is prepared from the following raw materials:

[0008] 85-120 parts by weight of acrylate copolymer, 3-5 parts by weight of crosslinking agent, 1.5-2.5 parts by weight of photoinitiator, 2-5 parts by weight of acid-resistant nanofiller, and 0.2-0.4 parts by weight of amine catalyst;

[0009] The acrylate copolymer is prepared from the following raw materials: 20-30 parts by mass of imidazoline monomer, 15-25 parts by mass of sterically hindered alkyl monomer, 45-55 parts by mass of flexible monomer, and 5-10 parts by mass of carboxyl monomer.

[0010] In this technical solution, a specific acrylate copolymer is used as a base to form a dense covalent network through reaction with a crosslinking agent, constructing a stable foundation to resist acid erosion. The sterically hindered alkyl monomer acts as a physical toughening unit; its large side groups effectively prevent excessively tight packing of polymer chains through steric hindrance, introducing static free volume into the system. The flexible monomer, acting as a kinetic regulating unit, utilizes the aforementioned free volume to provide a kinetic channel for the migration and diffusion of free radicals after UV irradiation, leveraging the superior chain mobility endowed by its long-chain structure, thereby achieving a sharp drop in adhesive strength. Furthermore, acid-resistant nanofillers are uniformly dispersed within this polymer network, playing a physical barrier role and further delaying the penetration path of the acid.

[0011] Secondly, this application provides a method for preparing a UV-resistant and acid-resistant tape for flexible glass thinning, comprising the following steps:

[0012] S1: Add 85-120 parts by weight of acrylate copolymer mixture to the reactor, then add 3-5 parts by weight of crosslinking agent, 1.5-2.5 parts by weight of photoinitiator, 2-5 parts by weight of acid-resistant nanofiller, and 0.2-0.4 parts by weight of amine catalyst and mix evenly to obtain a homogeneous adhesive solution;

[0013] S2: Apply a uniform adhesive solution onto the substrate layer, dry and cure to obtain a pressure-sensitive adhesive layer;

[0014] S3: Lay a release film layer on the pressure-sensitive adhesive layer, and then roll it up to obtain a UV-resistant and acid-resistant tape.

[0015] Preferably, in step S2, the drying and curing process is as follows: Zone 1: 60~70℃, time 3~5min; Zone 2: 80~90℃, time 3~5min; Zone 3: 110~120℃, time 3~5min.

[0016] In this technical solution, the mixing stage ensures uniform dispersion of each component, avoids local defects, and regulates the concentration of the homogeneous adhesive. The drying and curing stage, through temperature and time control, triggers pre-crosslinking to form a preliminary dense structure, while controlling the adhesive layer thickness to ensure UV light penetration efficiency. The lamination stage uses a low surface energy release film to ensure smooth release and protect the adhesive layer surface, maintaining initial bonding stability.

[0017] Preferably, in step S1, an acrylate copolymer mixture with a solid content of 85-120 parts by weight is added to the reactor, followed by 3-5 parts by weight of crosslinking agent, 1.5-2.5 parts by weight of photoinitiator, and 2-5 parts by weight of acid-resistant nanofiller. After mixing evenly, 0.2-0.4 parts by weight of amine catalyst is added and mixed evenly to obtain a homogeneous adhesive.

[0018] Preferably, the method for preparing the acrylate copolymer mixture includes the following steps:

[0019] Under an inert atmosphere, 20-30 parts by weight of imidazoline monomer, 15-25 parts by weight of sterically hindered alkyl monomer, 45-55 parts by weight of flexible monomer, 5-10 parts by weight of carboxyl monomer, initiator and organic solvent are mixed evenly, heated to 60-80℃, reacted for 4-6 hours, and concentrated to obtain acrylate copolymer mixture.

[0020] Preferably, the mass fraction of the acrylate copolymer in the acrylate copolymer mixture is 30% to 40%.

[0021] Preferably, the organic solvent includes ethyl acetate and toluene, wherein the mass ratio of ethyl acetate to toluene is 1:(1~2).

[0022] Preferably, the imidazolinyl monomer is 2-methyl-2-acrylate-2-(2-oxo-1-imidazolinyl)ethyl ester.

[0023] Preferably, the flexible monomer is a long-chain alkyl acrylate with not less than 12 carbon atoms.

[0024] More preferably, the flexible monomer is selected from either lauryl acrylate or octadecyl acrylate.

[0025] Preferably, the sterically hindered alkyl monomer is selected from either 1,3-dimethacrylate adamantane ester or isobornyl methacrylate.

[0026] Preferably, the carboxyl-containing monomer is selected from at least one of methacrylic acid and acrylic acid.

[0027] In this technical solution, an acid-resistant skeleton is constructed by imidazoline-containing monomers. The synergistic effect of sterically hindered alkyl monomers and flexible monomers is utilized, and the synergistic effect of each component is enhanced by small molecule carboxyl-containing monomers. Static free volume that maintains toughness and dynamic free volume that achieves UV viscosity reduction are simultaneously introduced into the polymer network. Finally, the unity of acid resistance and controllable peelability of the material is achieved at the molecular level.

[0028] Preferably, the acid-resistant nanofiller is a silanized nanofiller.

[0029] Preferably, the method for preparing the silanized nanofiller includes the following steps:

[0030] The nanofiller was uniformly dispersed in an ethanol aqueous solution, and a silane coupling agent was added and mixed evenly. The pH was adjusted to 4-5, the temperature was raised to 50-70℃, and the reaction was carried out for 3-5 hours. After cooling, solid-liquid separation was performed, followed by washing and drying to obtain the silanized nanofiller.

[0031] Preferably, the mass ratio of the nanofiller, silane coupling agent and ethanol aqueous solution is 15:(2~4):(96~98).

[0032] Preferably, the silane coupling agent is an epoxy silane coupling agent.

[0033] More preferably, the silane coupling agent is silane coupling agent KH560.

[0034] Preferably, the silanized nanofiller is selected from at least one of silanized nano-cerium dioxide and silanized nano-barium sulfate.

[0035] More preferably, the silanized nanofiller is silanized cerium dioxide nanoparticles with a particle size of 10~30nm.

[0036] In this technical solution, nano-cerium dioxide, with its stable chemical properties and high surface energy, can be tightly embedded in the polymer network, physically blocking the penetration and diffusion of acid.

[0037] Preferably, the crosslinking agent is selected from at least one of triglycidyl isocyanurate and dioxazoline.

[0038] In this technical solution, triglycidyl isocyanurate contains multiple epoxy groups, providing a rigid skeleton with high cross-linking density, while dioxazoline forms flexible, hydrolysis-resistant cross-linking points. This composite network, combining rigidity and flexibility, can more effectively resist the penetration and swelling of acid liquid, while giving the adhesive layer better toughness, significantly improving the durability and reliability of the tape in long-term acid corrosion environment.

[0039] Preferably, the amine catalyst is N,N-dimethylbenzylamine.

[0040] Preferably, the photoinitiator is 1-hydroxycyclohexylphenyl ketone.

[0041] Preferably, the substrate layer is a polyolefin film.

[0042] More preferably, the substrate layer is a polyethylene film with a thickness of 40~60μm.

[0043] Preferably, the release film is a fluorinated release film with a thickness of 50μm~75μm.

[0044] Preferably, the release force of the fluorinated release film is 3~5 g / in.

[0045] Preferably, the thickness of the pressure-sensitive adhesive layer is 20~40μm.

[0046] Preferably, the pressure-sensitive adhesive layer further includes 0.5 to 1 part by weight of antioxidant and 0.1 to 0.5 parts by weight of light stabilizer.

[0047] Preferably, the pressure-sensitive adhesive layer further includes 5 to 15 parts by weight of hydrogenated terpene resin.

[0048] Preferably, in step S1, after adding the acid-resistant nanofiller, the step further includes adding 0.5 to 1 parts by weight of antioxidant and 0.1 to 0.5 parts by weight of light stabilizer.

[0049] Preferably, in step S1, after adding the acrylate copolymer mixture, the step further includes adding 5 to 15 parts by weight of hydrogenated terpene resin.

[0050] In this technical solution, the hydrogenated terpene resin, through its unique modulus regulation behavior, synergistically enhances the initial bond strength and promotes interfacial exfoliation after UV irradiation.

[0051] In summary, this application has the following beneficial effects:

[0052] This application utilizes the synergistic effect of specific acrylate copolymers, crosslinking agents, and acid-resistant nanofillers to construct a dense composite structure that combines a rigid framework with flexible segments. Specifically, the rigid heterocycles containing imidazoline monomers, the dense network of the crosslinking agent, and the acid-resistant nanofillers work together to provide triple protection against acid erosion. Simultaneously, the combination of the static free volume created by the sterically hindered alkyl monomers and the dynamic segment movement achieved by the flexible monomers ensures the transition of the tape from strong adhesion to rapid and clean peeling. Detailed Implementation

[0053] The present application will be further described in detail below with reference to the embodiments.

[0054] Unless otherwise specified, the raw materials used in the embodiments and comparative examples of this application are all commercially available.

[0055] Preparation Examples 1-3: Acrylate Copolymers

[0056] Preparation Example 1

[0057] The preparation method of the acrylate copolymer in this preparation example includes the following steps:

[0058] Under a nitrogen atmosphere, 40g of 2-methyl-2-acrylate-2-(2-oxo-1-imidazolinyl)ethyl ester, 30g of 1,3-dimethacrylate adamantane ester, 90g of lauryl acrylate, 10g of acrylic acid, 1.7g of azobisisobutyronitrile, and 450g of organic solvent were stirred and mixed evenly, transferred to a reaction vessel, heated to 60℃, and stirred for 6 hours. After that, the mixture was concentrated by vacuum distillation at 80℃ to obtain a 30% (w / w) acrylate copolymer mixture.

[0059] The organic solvents include ethyl acetate and toluene, with a mass ratio of 1:1.

[0060] Preparation Example 2

[0061] The preparation method of the acrylate copolymer in this preparation example includes the following steps:

[0062] Under a nitrogen atmosphere, 60g of 2-methyl-2-acrylate-2-(2-oxo-1-imidazolinyl)ethyl ester, 50g of isobornyl methacrylate, 110g of lauryl acrylate, 20g of methacrylic acid, 1.2g of azobisisobutyronitrile, and 450g of organic solvent were stirred and mixed evenly, transferred to a reaction vessel, heated to 80℃, and stirred for 4 hours. After that, the mixture was concentrated by vacuum distillation at 80℃ to obtain a 40% (w / w) acrylate copolymer mixture.

[0063] The organic solvents include ethyl acetate and toluene, with a mass ratio of 1:2.

[0064] Preparation Example 3

[0065] The preparation method of the acrylate copolymer in this preparation example includes the following steps:

[0066] Under a nitrogen atmosphere, 50g of 2-methyl-2-acrylate-2-(2-oxo-1-imidazolinyl)ethyl ester, 40g of isobornyl methacrylate, 100g of octadecyl acrylate, 5g of methacrylic acid, 10g of acrylic acid, 1.6g of azobisisobutyronitrile, and 450g of organic solvent were stirred and mixed evenly, transferred to a reaction vessel, heated to 70℃, and stirred for 5 hours. After that, the mixture was concentrated by vacuum distillation at 80℃ to obtain a 35% (w / w) acrylate copolymer mixture.

[0067] The organic solvents include ethyl acetate and toluene, with a mass ratio of 1:1.5.

[0068] Preparation Examples 4-6

[0069] Preparation Example 4

[0070] The preparation method of the silanized nanofiller in this example includes the following steps:

[0071] 15g of nano-barium sulfate was added to 98g of ethanol aqueous solution, transferred to an ultrasonic device, and ultrasonically treated for 30 minutes at a power of 300W and a frequency of 20KHz. Then, 2g of silane coupling agent KH560 was added, and the mixture was stirred and mixed evenly at a speed of 200r / min. The pH was adjusted to 5 using a 5% acetic acid solution, the temperature was raised to 50℃, and the reaction was stirred for 5 hours. The mixture was filtered, washed three times with deionized water, and dried at 80℃ to constant weight to obtain silanized nanofiller.

[0072] The nano-barium sulfate has a particle size distribution of 20~40nm; the volume ratio of ethanol to water in the ethanol-water solution is 9:1.

[0073] Preparation Example 5

[0074] The preparation method of the silanized nanofiller in this example includes the following steps:

[0075] 10g of nano-barium sulfate and 5g of nano-cerium dioxide were added to 97g of ethanol aqueous solution, transferred to an ultrasonic device, and ultrasonically treated for 30min at a power of 300W and a frequency of 20KHz. Then, 3g of silane coupling agent KH560 was added, and the mixture was stirred and mixed evenly at a speed of 200r / min. The pH was adjusted to 4.5 using a 5% acetic acid solution, the temperature was raised to 70℃, and the reaction was stirred for 3h. The mixture was filtered, washed three times with deionized water, and dried at 80℃ to constant weight to obtain silanized nanofiller.

[0076] Among them, the particle size distribution of nano-barium sulfate is 20~40nm; the particle size distribution of nano-cerium dioxide is 10~30nm; and the volume ratio of ethanol to water in the ethanol aqueous solution is 8:1.

[0077] Preparation Example 6

[0078] The preparation method of the silanized nanofiller in this example includes the following steps:

[0079] 15g of nano-cerium dioxide was added to 96g of ethanol aqueous solution, transferred to an ultrasonic device, and ultrasonically treated for 300W at a frequency of 20KHz for 30min. Then, 4g of silane coupling agent KH560 was added, and the mixture was stirred and mixed evenly at a speed of 200r / min. The pH was adjusted to 4 using a 5% acetic acid solution, the temperature was raised to 60℃, and the reaction was stirred for 4h. The mixture was filtered, washed three times with deionized water, and dried at 80℃ to constant weight to obtain silanized nanofiller.

[0080] The particle size distribution of the nano-cerium dioxide is 10~30nm; the volume ratio of ethanol to water in the ethanol aqueous solution is 8:1.

[0081] Example 1

[0082] The flexible glass thinning UV anti-adhesion and acid-resistant tape of this embodiment includes a substrate layer, a pressure-sensitive adhesive layer, and a release film layer stacked sequentially. The pressure-sensitive adhesive layer is prepared from the following raw materials in parts by weight:

[0083] 85g of acrylate copolymer, 3g of crosslinking agent, 1.5g of photoinitiator, 2g of acid-resistant nanofiller, and 0.2g of N,N-dimethylbenzylamine.

[0084] The acrylate copolymer was derived from the acrylate copolymer mixture in Preparation Example 1; the crosslinking agent was triglycidyl isocyanurate; the photoinitiator was 1-hydroxycyclohexylphenyl ketone; and the acid-resistant nanofiller was derived from Preparation Example 4.

[0085] The method for preparing the flexible glass thinning UV anti-adhesion and acid-resistant tape of this embodiment includes the following steps:

[0086] S1: Add 283.3g of acrylate copolymer mixture (approximately 85g of acrylate copolymer) to the reactor, turn on the stirring device at 300r / min, add 3g of crosslinking agent, 1.5g of photoinitiator, and 2g of acid-resistant nanofiller in sequence, stir and mix for 35min, then add 0.2g of N,N-dimethylbenzylamine, and continue stirring and mixing for 10min to obtain a homogeneous adhesive solution;

[0087] S2: Apply a uniform adhesive liquid onto the substrate layer by roller, and then heat it at 70°C for 3 min in zone 1, 90°C for 3 min in zone 2, and 120°C for 3 min in zone 3 to obtain a pressure-sensitive adhesive layer.

[0088] S3: Lay a release film layer on the pressure-sensitive adhesive layer, and then wind it up to obtain a UV-resistant and acid-resistant tape.

[0089] The solid content of the uniform adhesive solution is approximately 32%; the thickness of the pressure-sensitive adhesive layer is approximately 20 μm.

[0090] The substrate layer is a polyethylene film with a thickness of 40μm;

[0091] The release film is a fluorinated release film with a thickness of 50 μm and a release force of approximately 3~5 g / in.

[0092] Example 2

[0093] The flexible glass thinning UV anti-adhesion and acid-resistant tape of this embodiment includes a substrate layer, a pressure-sensitive adhesive layer, and a release film layer stacked sequentially. The pressure-sensitive adhesive layer is prepared from the following raw materials in parts by weight:

[0094] 120g of acrylate copolymer, 5g of crosslinking agent, 2.5g of photoinitiator, 5g of acid-resistant nanofiller, 10101g of antioxidant, 0.5g of light stabilizer UV-944, and 0.4g of N,N-dimethylbenzylamine.

[0095] The acrylate copolymer was derived from the acrylate copolymer mixture in Preparation Example 2; the crosslinking agent was triglycidyl isocyanurate; the photoinitiator was 1-hydroxycyclohexylphenyl ketone; and the acid-resistant nanofiller was derived from Preparation Example 5.

[0096] The method for preparing the flexible glass thinning UV anti-adhesion and acid-resistant tape of this embodiment includes the following steps:

[0097] S1: Add 300g of acrylate copolymer mixture (approximately 120g of acrylate copolymer) to the reactor, turn on the stirring device at 300r / min, and add 5g of crosslinking agent, 2.5g of photoinitiator, 5g of acid-resistant nanofiller, 1g of antioxidant 1010, and 0.5g of light stabilizer UV-944 in sequence. Stir and mix for 50min, then add 0.4g of N,N-dimethylbenzylamine and continue stirring and mixing for 10min to obtain a homogeneous adhesive solution.

[0098] S2: Apply a uniform adhesive liquid to the substrate layer by roller, and then heat it at 60°C for 5 min in zone 1, 80°C for 5 min in zone 2, and 110°C for 5 min in zone 3 to obtain a pressure-sensitive adhesive layer.

[0099] S3: Lay a release film layer on the pressure-sensitive adhesive layer, and then wind it up to obtain a UV-resistant and acid-resistant tape.

[0100] The solid content of the uniform adhesive solution is approximately 43%; the thickness of the pressure-sensitive adhesive layer is approximately 40 μm.

[0101] The substrate layer is a polyethylene film with a thickness of 60μm;

[0102] The release film is a fluorinated release film with a thickness of 75 μm and a release force of approximately 3~5 g / in.

[0103] Example 3

[0104] The flexible glass thinning UV anti-adhesion and acid-resistant tape of this embodiment includes a substrate layer, a pressure-sensitive adhesive layer, and a release film layer stacked sequentially. The pressure-sensitive adhesive layer is prepared from the following raw materials in parts by weight:

[0105] 100g of acrylate copolymer, 4g of crosslinking agent, 2g of photoinitiator, 3.5g of acid-resistant nanofiller, 0.5g of antioxidant 1010, 0.1g of light stabilizer UV-944, and 0.3g of N,N-dimethylbenzylamine.

[0106] The acrylate copolymer was derived from the acrylate copolymer mixture in Preparation Example 3; the crosslinking agent was triglycidyl isocyanurate; the photoinitiator was 1-hydroxycyclohexylphenyl ketone; and the acid-resistant nanofiller was derived from Preparation Example 6.

[0107] The method for preparing the flexible glass thinning UV anti-adhesion and acid-resistant tape of this embodiment includes the following steps:

[0108] S1: Add 285.7g of acrylate copolymer mixture (approximately 100g of acrylate copolymer) to the reactor, turn on the stirring device at 300r / min, and add 4g of crosslinking agent, 2g of photoinitiator, 3.5g of acid-resistant nanofiller, 0.5g of antioxidant 1010, and 0.1g of light stabilizer UV-944 in sequence. Stir and mix for 45min, then add 0.3g of N,N-dimethylbenzylamine and continue stirring and mixing for 10min to obtain a homogeneous adhesive solution.

[0109] S2: Apply a uniform adhesive liquid onto the substrate layer by roller, and then heat it at 60°C for 4 min in zone 1, 80°C for 4 min in zone 2, and 110°C for 4 min in zone 3 to obtain a pressure-sensitive adhesive layer.

[0110] S3: Lay a release film layer on the pressure-sensitive adhesive layer, and then wind it up to obtain a UV-resistant and acid-resistant tape.

[0111] The solid content of the uniform adhesive solution is approximately 37%; the thickness of the pressure-sensitive adhesive layer is approximately 30 μm.

[0112] The substrate layer is a polyethylene film with a thickness of 50μm;

[0113] The release film is a fluorinated release film with a thickness of 75 μm and a release force of approximately 3~5 g / in.

[0114] Example 4

[0115] The flexible glass thinning UV anti-adhesion and acid-resistant tape of this embodiment includes a substrate layer, a pressure-sensitive adhesive layer, and a release film layer stacked sequentially. The pressure-sensitive adhesive layer is prepared from the following raw materials in parts by weight:

[0116] 100g of acrylate copolymer, 5g of hydrogenated terpene resin, 4g of crosslinking agent, 2g of photoinitiator, 3.5g of acid-resistant nanofiller, 0.5g of antioxidant 1010, 0.3g of light stabilizer UV-944, and 0.3g of N,N-dimethylbenzylamine.

[0117] The acrylate copolymer was derived from the acrylate copolymer mixture in Preparation Example 3; the crosslinking agent was 4g, which contained 3g of triglycidyl isocyanurate and 1g of dioxazoline; the photoinitiator was 1-hydroxycyclohexylphenyl ketone; and the acid-resistant nanofiller was derived from Preparation Example 5.

[0118] The method for preparing the flexible glass thinning UV anti-adhesion and acid-resistant tape of this embodiment includes the following steps:

[0119] S1: Add 285.7g of acrylate copolymer mixture (approximately 100g of acrylate copolymer) to the reactor, turn on the stirring device at 300r / min, and add 5g of hydrogenated terpene resin, 4g of crosslinking agent, 2g of photoinitiator, 3.5g of acid-resistant nanofiller, 0.5g of antioxidant 1010, and 0.3g of light stabilizer UV-944 in sequence. Stir and mix for 45min, then add 0.3g of N,N-dimethylbenzylamine and continue stirring and mixing for 10min to obtain a homogeneous adhesive solution.

[0120] S2: Apply a uniform adhesive liquid onto the substrate layer by roller, and then heat it at 60°C for 4 min in zone 1, 80°C for 4 min in zone 2, and 110°C for 4 min in zone 3 to obtain a pressure-sensitive adhesive layer.

[0121] S3: Lay a release film layer on the pressure-sensitive adhesive layer, and then wind it up to obtain a UV-resistant and acid-resistant tape.

[0122] The solid content of the uniform adhesive solution is approximately 37%; the thickness of the pressure-sensitive adhesive layer is approximately 30 μm.

[0123] The substrate layer is a polyethylene film with a thickness of 50μm;

[0124] The release film is a fluorinated release film with a thickness of 75 μm and a release force of approximately 3~5 g / in.

[0125] Example 5

[0126] The difference between this embodiment and embodiment 4 is that:

[0127] The amount of hydrogenated terpene resin used is 15g;

[0128] The rest is the same as in Example 4.

[0129] Comparative Example 1

[0130] The difference between this comparative example and Example 1 is as follows:

[0131] The preparation method of the acrylate copolymer in this preparation example includes the following steps:

[0132] Under a nitrogen atmosphere, 40g of methyl methacrylate, 30g of isobornyl methacrylate, 90g of lauryl acrylate, 10g of acrylic acid, 1.7g of azobisisobutyronitrile, and 450g of organic solvent were stirred and mixed evenly, transferred to a reaction vessel, heated to 60℃, and stirred for 6 hours. After that, the mixture was concentrated by vacuum distillation at 80℃ to obtain a 30% (w / w) acrylate copolymer mixture.

[0133] The organic solvents include ethyl acetate and toluene, with a mass ratio of 1:1.

[0134] Everything else is the same as in Example 1.

[0135] Comparative Example 2

[0136] The difference between this comparative example and Example 1 is as follows:

[0137] The preparation method of the acrylate copolymer in this preparation example includes the following steps:

[0138] Under a nitrogen atmosphere, 40g of 2-methyl-2-acrylate-2-(2-oxo-1-imidazolinyl)ethyl ester, 30g of methyl methacrylate, 90g of lauryl acrylate, 10g of acrylic acid, 1.7g of azobisisobutyronitrile, and 450g of organic solvent were stirred and mixed evenly, transferred to a reaction vessel, heated to 60℃, and stirred for 6 hours. After that, the mixture was concentrated by vacuum distillation at 80℃ to obtain a 30% (w / w) acrylate copolymer mixture.

[0139] The organic solvents include ethyl acetate and toluene, with a mass ratio of 1:1.

[0140] Everything else is the same as in Example 1.

[0141] Comparative Example 3

[0142] The difference between this comparative example and Example 1 is as follows:

[0143] No acid-resistant nanofillers were added.

[0144] Everything else is the same as in Example 1.

[0145] Performance testing

[0146] The UV-resistant and acid-resistant tapes prepared in Examples 1-5 and Comparative Examples 1-3 were uniformly cut and prepared into standard samples. The following performance tests were then performed, and the test results are shown in Table 1.

[0147] Acid resistance: Referring to the actual working conditions of flexible glass thinning, a mixed acid etching solution was prepared (of which, HF 5%, HNO3 15%, HCl 10%, and the remainder is deionized water). The tape sample was attached to a clean glass substrate and placed in a constant temperature environment of (50±2)℃. The tape surface was continuously sprayed for 200 minutes using a spraying device. During the spraying process, it was observed whether the tape edge peeled up, bubbled, or fell off.

[0148] Thickness uniformity test: A high-precision thickness gauge is used to randomly select 10 points on each sample for measurement, and the thickness standard deviation is calculated;

[0149] Initial bond strength: Apply 25mm wide tape to alkali-free glass and perform a 180° peel test at a speed of 300mm / min according to GB / T 2792-2014 standard, and record the strength value (unit N / 25mm).

[0150] UV de-tack properties: From the substrate surface, using a wavelength of 365nm and an intensity of 100mW / cm²... 2 The sample was irradiated with a UV lamp, with a total irradiation dose of 500 mJ / cm². 2 Immediately after irradiation, its 180° peel force is tested and recorded as the UV peel force.

[0151] Table 1. Performance tests of UV-resistant and acid-resistant tapes prepared in Examples 1-5 and Comparative Examples 1-3

[0152]

[0153] As can be seen from Example 1 and Comparative Examples 1-3, the acrylate copolymer and acid-resistant nanofiller used in this application constitute an indispensable synergistic acid-resistant system. Although the initial bond strength of Comparative Examples 1 and 3 is better than some examples, their acid resistance has completely failed, proving that imidazoline-containing monomers are the basis for constructing the acid-resistant chemical framework; sterically hindered alkyl monomers are the key to maintaining the toughness and crack resistance of the adhesive layer; and the physical barrier effect of acid-resistant nanofillers is indispensable for delaying acid penetration.

[0154] Examples 1-5 demonstrate that a polymer network possessing both a rigid framework and moderate free volume was constructed through the synergistic copolymerization of imidazoline-containing monomers, sterically hindered alkyl monomers, and flexible long-chain monomers. This network forms a dense covalent structure with the crosslinking agent to resist acid erosion, while its inherent flexible segments provide crucial reaction space for UV light-triggered secondary crosslinking and a sharp reduction in adhesive strength. Furthermore, the introduction of hydrogenated terpene resin effectively improved the initial adhesive strength of the system without compromising its overall acid resistance and UV-induced adhesion reduction properties.

[0155] This specific embodiment is merely an explanation of this application and is not intended to limit it. After reading this specification, those skilled in the art can make modifications to this embodiment without contributing any inventive step, but such modifications are protected by patent law as long as they fall within the scope of the claims of this application.

Claims

1. A flexible glass thinning UV adhesion-reducing acid-resistant tape, characterized by, The UV adhesion-reducing acid-resistant adhesive tape comprises a substrate layer, a pressure-sensitive adhesive layer and a release film layer which are sequentially stacked, and the pressure-sensitive adhesive layer is prepared from the following raw materials: 85-120 parts by mass of an acrylate copolymer, 3-5 parts by mass of a crosslinking agent, 1.5-2.5 parts by mass of a photoinitiator, 2-5 parts by mass of acid-resistant nano-filler and 0.2-0.4 parts by mass of an amine catalyst; The acrylate copolymer is prepared from the following raw materials: 20-30 parts by mass of an imidazoline group-containing monomer, 15-25 parts by mass of a large steric alkyl group-containing monomer, 45-55 parts by mass of a flexible monomer and 5-10 parts by mass of a carboxyl group-containing monomer; The flexible monomer is a long-chain alkyl acrylate with a carbon atom number of not less than 12. The large steric alkyl group-containing monomer is selected from any one of 1,3-dimethyladamantyl methacrylate and isobornyl methacrylate. The acid-resistant nano-filler is a silanized nano-filler, and the silanized nano-filler is selected from at least one of silanized nano-cerium dioxide and silanized nano-barium sulfate. The crosslinking agent is selected from at least one of isocyanuric acid triglycidyl ester and dioxazoline.

2. The method of producing a flexible glass thinning UV-debonding acid-resistant tape according to claim 1, characterized by, The method comprises the following steps: S1: adding an acrylate copolymer mixed solution with a solid content of 85-120 parts by mass into a reactor, then adding 3-5 parts by mass of a crosslinking agent, 1.5-2.5 parts by mass of a photoinitiator, 2-5 parts by mass of acid-resistant nano-filler and 0.2-0.4 parts by mass of an amine catalyst, and mixing them uniformly to obtain a uniform glue solution; S2: coating the uniform glue solution on a substrate layer, drying and curing to obtain a pressure-sensitive adhesive layer; S3: combining a release film layer on the pressure-sensitive adhesive layer, and winding to obtain a UV adhesion-reducing acid-resistant adhesive tape.

3. The method of producing a flexible glass thinning UV-debonding acid-resistant tape according to claim 2, characterized by, The preparation method of the acrylate copolymer mixed solution comprises the following steps: Under an inert atmosphere, the imidazoline group-containing monomer, the large steric alkyl group-containing monomer, the flexible monomer, the carboxyl group-containing monomer, an initiator and an organic solvent are mixed uniformly, heated to 60-80℃, reacted for 4-6 hours, and concentrated to obtain an acrylate copolymer mixed solution.

4. The method of producing a flexible glass thinning UV-debonding acid-resistant tape according to claim 3, characterized by, The imidazoline group-containing monomer is 2-methyl-2-acrylic acid-2-(2-oxo-1-imidazolinyl) ethyl ester.

5. The method of producing a flexible glass thinning UV-debonding acid-resistant tape according to claim 3, characterized by, The carboxyl group-containing monomer is selected from at least one of methacrylic acid and acrylic acid.

6. The method of producing a flexible glass thinning UV-debonding acid-resistant tape according to claim 2, characterized by, In step S1, after the acrylate copolymer mixed solution is added, the step of adding 5-15 parts by mass of a hydrogenated terpene resin is further included.

Images