A microporous sponge tape with high peel strength and its preparation process

Abstract

This invention belongs to the field of adhesive technology, specifically relating to a high-peel-strength microporous sponge tape and its preparation process. The microporous sponge tape has a layered structure, comprising, from top to bottom, a transparent PET release film, a UV-curable acrylate pressure-sensitive adhesive layer, and a sponge substrate layer. This invention achieves a synergistic improvement in the formulation of the sponge substrate and the interfacial reaction of the adhesive layer. This allows the isocyanate and / or epoxy groups in the UV-curable acrylate pressure-sensitive adhesive layer of the microporous sponge tape to undergo interfacial chemical bonding reactions with the hydroxyl groups introduced into the sponge substrate layer via a hydroxyl-containing terpolymer acetate resin during the composite process and subsequent curing. This significantly improves the bonding strength and durability of the obtained microporous sponge tape.

Description

Technical Field

[0001] This invention belongs to the field of adhesives, specifically relating to a microporous sponge tape with high peel strength and its preparation process. Background Technology

[0002] Microporous foam tape, due to its combined functions of cushioning, gap filling, vibration damping, and bonding, is widely used in electronic component assembly, structural component bonding, and precision component fixing. Unlike ordinary flat tapes, microporous foam tape is typically composed of a release film, an adhesive layer, and a foam substrate. The foam substrate serves both cushioning and rebound functions and directly affects the coating, lamination, and long-term adhesive stability of the adhesive layer. For this type of product, high peel strength is not solely determined by the adhesive layer itself, but rather by the combined effect of the adhesive layer's wetting and adhesion to the surface of the adhered object, as well as the interfacial anchoring strength between the adhesive layer and the foam substrate. If the interfacial bonding between the adhesive layer and the foam substrate is insufficient, delamination is likely to occur during peeling; similarly, if the adhesive layer does not adequately wet the surface of the adhered object, such as stainless steel, the overall peel strength will be difficult to improve.

[0003] In practical applications, existing microporous sponge tapes commonly suffer from problems such as uneven pore structure of the sponge substrate, poor dimensional stability, and insufficient interfacial bonding between the adhesive layer and the sponge. On the one hand, improper foaming process control can lead to large, collapsed, and unevenly distributed pores and fluctuating surface roughness in the sponge substrate, resulting in insufficient interfacial contact and discontinuous stress transfer after adhesive layer lamination, making interfacial delamination more likely during peeling. On the other hand, some sponge substrates have poor thermal dimensional stability, making them prone to shrinkage, warping, or localized stress concentration during lamination, curing, or subsequent use, further weakening the interfacial bonding between the adhesive layer and the sponge. Furthermore, some low-polarity or insufficiently surface-active sponge substrates have surfaces that are unfavorable for adhesive wetting and anchoring, also resulting in low peel strength and retention.

[0004] To address these issues, existing technologies typically employ the following methods: First, increasing the initial peel strength by enhancing the adhesive's inherent adhesion or increasing the amount of tackifying resin; second, strengthening the adhesive layer's cohesion by increasing the degree of cross-linking, improving curing strength, or introducing functional monomers; third, improving the foam structure and dimensional stability of the sponge substrate by adjusting the sponge formulation, adding fillers, or altering the foaming process; and fourth, improving the surface polarity of the sponge and the adhesion of the adhesive layer through surface treatment, primer coating, or composite modification. However, each of these methods has its limitations: simply increasing the adhesive layer's tack can easily lead to insufficient cohesion, residual adhesive, or decreased tack; simply increasing the degree of cross-linking can easily harden the adhesive layer and reduce its adhesion; relying solely on the sponge formulation to improve the foam structure often fails to simultaneously address cell uniformity, substrate dimensional stability, and interfacial activity; and while conventional surface treatments can improve adhesion to some extent, they are unlikely to form a long-term stable anchoring structure at the interface.

[0005] Therefore, how to enhance the interfacial anchoring effect between the adhesive layer and the sponge substrate, as well as the wetting and adhesion ability of the adhesive layer to the surface of the adhered object, so as to obtain microporous sponge tape with high peel strength and peel retention rate, remains a technical problem that urgently needs to be solved in this field. Summary of the Invention

[0006] The existing technical problems are: conventional microporous sponge tapes have poor dimensional stability and adhesive durability, and insufficient interfacial bonding strength between the sponge substrate and the adhesive layer. To address these problems, this invention provides a microporous sponge tape with high peel strength. This invention utilizes a synergistic design of the sponge substrate formulation and the interfacial reaction of the adhesive layer: on the one hand, EVA and a binary chloroacetic acid resin / hydroxyl ternary chloroacetic acid resin are compounded in the sponge substrate to construct a microporous sponge skeleton with fine and uniform pores, good dimensional stability, and reactive hydroxyl sites on the surface; on the other hand, a reactive acrylate prepolymer containing isocyanate groups and / or epoxy groups is introduced into the UV-cured acrylate pressure-sensitive adhesive layer, causing an interfacial chemical bonding reaction between the sponge substrate and the adhesive layer during the compounding and subsequent curing process, forming a stronger interfacial bonding structure. The technical solution adopted by this invention to solve the above technical problems is: This invention provides a microporous sponge tape with high peel strength, which has a layered structure and includes, from top to bottom, a transparent PET release film, a UV-cured acrylic pressure-sensitive adhesive layer, and a sponge substrate. The UV-curable acrylic pressure-sensitive adhesive layer comprises the following raw materials in parts by weight: Acrylic ester prepolymer 80-100 parts; tackifying resin 15-25 parts; photoinitiator 1.0-3.0 parts; reactive diluent 10-20 parts; The sponge substrate comprises the following raw materials in parts by weight: 70-90 parts EVA; 10-30 parts vinyl chloride resin; 2.0-5.0 parts compatibilizer; 0.1-0.3 parts crosslinking agent; 1.0-3.0 parts nanofiller; 0.2-0.5 parts antioxidant; 0.2-0.4 parts lubricant; The chloroacetic acid resin is composed of a binary chloroacetic acid and a hydroxyl ternary chloroacetic acid in a mass ratio of 5-10:1; The acrylate prepolymer contains groups that can chemically react with hydroxyl groups, including isocyanate groups and / or epoxy groups. The isocyanate groups and / or epoxy groups can react with the hydroxyl groups of the hydroxyl ternary chloroacetic acid resin in the sponge substrate during the compounding or curing process, which can improve the interfacial bonding strength between the pressure-sensitive adhesive layer and the sponge substrate.

[0007] The EVA contains 35-40% VA; the VA content in the dichloroacetic acid is 10-15%.

[0008] The compatibilizer is composed of EVA-g-MAH and CPE in a mass ratio of 2-3:1.

[0009] The present invention also provides a process for preparing the above-mentioned high peel strength microporous sponge tape, comprising the following steps: S1, Prepare UV-curable acrylic pressure-sensitive adhesive; S2, Preparation of sponge substrate; S3, UV-curable acrylic pressure-sensitive adhesive is evenly coated onto the surface of transparent PET release film; S4, the side of the transparent PET release film coated with UV adhesive is laminated with the sponge substrate on a hot press laminating machine; S5, the composite material is then subjected to UV curing, aging, slitting or die-cutting in sequence to obtain a microporous sponge tape with high peel strength of the required size.

[0010] The specific steps of S1 are as follows: S11: Under the protection of nitrogen or inert gas, add the mixed solvent of ethyl acetate and toluene in a volume ratio of 6:4 into the reaction vessel, heat to 75-85℃, add the initiator BPO into the mixed solvent, and stir until uniform. S12: After the acrylate monomers are mixed evenly, a mixed monomer is obtained. The mixed monomers accounting for 35-45 wt% of the total mass of the mixed monomers are added to the reaction system of step (1) to carry out free radical polymerization. After stirring the polymerization reaction for 20-40 min, the remaining mixed monomers are added dropwise to the reaction system within 1-3 h. After the dropwise addition is completed, stirring (200-400 rpm) is continued for polymerization until the viscosity of the reaction system at 25℃ reaches 8000-10000 mPa·s. The reaction ends and the acrylate prepolymer is obtained. Acrylic monomers include butyl acrylate, methyl methacrylate and dicyclopentyl methacrylate, and acrylate monomers also include isocyanate ethyl methacrylate and / or glycidyl methacrylate.

[0011] S13: Add tackifying resin, reactive diluent and photoinitiator to the acrylate prepolymer, stir at 20-40℃ (200-500rpm) for 20-60min to obtain UV-curable acrylate pressure-sensitive adhesive.

[0012] Furthermore, step S2 employs an extrusion foaming process to prepare the sponge substrate, as detailed below: S21: Weigh out the EVA, vinyl chloride resin, compatibilizer, crosslinking agent, nanofiller, antioxidant and lubricant according to the formula, and mix them evenly (mix in a high-speed mixer at 300-800 rpm for 5-15 min) to obtain the premixed material; S22: The premixed material is fed into a twin-screw extruder for melt plasticization and granulation to obtain granules. The preferred length-to-diameter ratio of the extruder is 32:1-40:1, the screw speed is 200-350 rpm, and the temperatures of each zone are controlled as follows: 95-105℃ / 105-115℃ / 110-120℃ / 115-125℃ / 120-130℃ / 120-130℃ / 125-135℃ / 125-135℃; the die head temperature is 120-130℃. S23: The granules are fed into the foaming equipment of a single-screw extruder. Supercritical carbon dioxide is injected into the extruder melt in zone 4 or zone 5 of the extruder using a supercritical carbon dioxide metering pump. The injection pressure is 10-18 MPa. The material is then further mixed in the barrel to form a homogeneous foamed material. The single-screw extruder has a length-to-diameter ratio of 28:1-36:1, a screw speed of 40-80 rpm, and zone temperatures of 90-105℃ / 100-115℃ / 110-125℃ / 115-130℃ / 110-125℃ / 105-120℃. The die head temperature is 105-120℃. S24: The homogeneous foam material is extruded through a die and foamed into a sheet, which is then subjected to three-roll light pressing for thickness determination and surface leveling, cooling, traction and winding to obtain the sponge substrate.

[0013] The specific steps of S3 are as follows: S31: Using slit coating, the UV-curable acrylic pressure-sensitive adhesive is uniformly coated on one side of the transparent PET release film. The adhesive coating temperature is 25-45℃, the oven segment temperature is 60-80℃ / 80-100℃ / 100-120℃, the wind speed is 5-15m / s, the linear velocity is 5-20m / min, and the adhesive layer thickness is controlled to be 50-150μm.

[0014] The specific steps in S4 are as follows: S41: A transparent PET release film coated with UV adhesive is hot-pressed with a sponge substrate to obtain a composite material; the composite temperature is 40-60℃.

[0015] The specific steps in S5 are as follows: S51: The composite material is UV-cured to obtain a UV-cured composite material, wherein the UV curing energy is 500-1500 mJ / cm². 2 ; S52: After curing, slitting or die-cutting, the photocurable composite material is used to obtain a microporous sponge tape with high peel strength of the required size; The curing process is carried out in a curing chamber at a temperature of 40-70°C for 12-72 hours.

[0016] The beneficial effects of this invention are: (1) This invention improves the formulation of microporous sponge substrate, enabling the sponge substrate to simultaneously possess good pore structure, dimensional stability, and interfacial compatibility. EVA imparts good flexibility, resilience, and foaming adaptability to the substrate; the compounding of binary chloroacetic acid resin and hydroxyl terchloroacetic acid resin can, on the one hand, improve the polarity and surface energy of the system, enhance the wetting acceptance of the sponge substrate surface to the adhesive layer, and improve the subsequent printing and lamination compatibility; on the other hand, the high glass transition temperature and polar segments of the chloroacetic acid resin help improve the dimensional stability of the sponge substrate; at the same time, the hydroxyl groups in the hydroxyl terchloroacetic acid resin provide abundant active sites for interfacial chemical reactions with reactive groups (isocyanate and / or epoxy groups) in the adhesive layer.

[0017] (2) This invention introduces a reactive acrylate prepolymer containing isocyanate groups and / or epoxy groups into the UV-cured acrylate pressure-sensitive adhesive layer, enabling the adhesive layer to undergo interfacial chemical reactions with the hydroxyl groups introduced into the sponge substrate through hydroxyl ternary chloroacetic acid resin during the composite and subsequent curing process, thereby constructing a synergistic adhesion enhancement mechanism of "physical wetting-interfacial penetration-chemical anchoring". First, the solvent in the adhesive layer can produce a moderate swelling effect on the surface of the sponge substrate during the composite process, forming more sufficient mechanical interlocking and interfacial contact; on this basis, the isocyanate groups and / or epoxy groups in the acrylate prepolymer further react chemically with the hydroxyl groups in the sponge substrate, significantly improving the peel strength between the adhesive layer and the substrate; secondly, the reasonable combination of tackifying resin, reactive diluent and photoinitiator enables the adhesive layer to maintain good cohesion after UV curing, and avoids peel failure at the interface due to the adhesive layer being too brittle or too soft.

[0018] (3) In the preparation of microporous sponge tape, the sponge substrate formulation, adhesive coating and drying, compounding, UV curing and aging processes are coordinated to ensure that the final product has high and stable peel performance. Specifically, in the preparation of the sponge substrate, the thickness and surface flatness of the substrate can be controlled while ensuring the stability of the cell structure through processes such as premixing, twin-screw plasticizing and granulation, single-screw supercritical carbon dioxide foaming and light pressure thickness determination; in the subsequent UV curing and aging stages, the adhesive network construction and interface reaction are completed, so that the material as a whole achieves a more stable cohesive-interface balance.

[0019] In summary, this invention constructs a multi-layered reinforcement mechanism through "the microporous stable structure of polar EVA / vinyl chloride composite sponge substrate - hydroxyl ternary vinyl chloride resin providing interfacial reaction sites - solvent-assisted penetration and chemical anchoring of reactive UV acrylate pressure-sensitive adhesive layer - synergistic foaming, coating, lamination, UV curing and aging processes". It takes into account the cushioning properties of the sponge substrate, the printability / lamination suitability, the adhesion and cohesion of the adhesive layer, and the high peel strength and usage stability of the final product, and has good engineering application value and industrialization prospects. Detailed Implementation

[0020] The present invention will be described in detail below with reference to embodiments. However, it should be understood that the following embodiments are merely illustrative examples of implementation of the present invention and are not intended to limit the scope of the present invention.

[0021] This invention addresses the shortcomings of existing microporous sponge tapes, such as poor uniformity of the foam cells in the sponge substrate and insufficient dimensional stability, leading to inadequate interfacial contact, discontinuous stress transfer, and insufficient adhesive strength. A novel high-peel-strength microporous sponge tape and its preparation process are developed. The specific solution is as follows: First, EVA is compounded with binary chloroacetate / hydroxyl ternary chloroacetate in the sponge substrate, and compatibilizers, crosslinking agents and surface-treated nanofillers are introduced. A microporous sponge skeleton with fine pores, stable dimensions and polar hydroxyl sites on the surface is constructed by supercritical carbon dioxide foaming. Among them, chloroacetate resin not only improves the polarity of the substrate and the printability / lamination suitability, but also improves thermal dimensional stability.

[0022] Secondly, a reactive prepolymer containing isocyanate groups and / or epoxy groups is introduced into the UV acrylate pressure-sensitive adhesive layer, so that the adhesive layer can undergo an interfacial reaction with the hydroxyl ternary chloroacetic acid resin during the compounding and curing process. At the same time, the solvent in the adhesive layer produces a moderate swelling effect on the sponge surface, promoting the penetration of the adhesive into the sponge surface and forming a mechanical interlocking effect, thereby achieving a dual enhancement of "swelling penetration-chemical anchoring".

[0023] Third, by synergistically controlling the foaming, coating, drying, lamination, UV curing and aging processes, the stability of the sponge structure, the uniformity of the adhesive film formation and the fullness of the interfacial reaction are ensured, ultimately achieving a synergistic improvement in peel strength, bonding stability and reliability.

[0024] The embodiments of the present invention are as follows: This invention provides a high peel strength microporous sponge tape, which is a layered material and comprises, from top to bottom, a transparent PET release film layer, a UV-cured acrylic pressure-sensitive adhesive layer, and a sponge substrate; The UV-curable acrylic pressure-sensitive adhesive layer comprises the following raw materials in parts by weight: Acrylic ester prepolymer 80-100 parts; tackifying resin 15-25 parts; photoinitiator 1.0-3.0 parts; reactive diluent 10-20 parts; The sponge substrate comprises the following raw materials in parts by weight: The following components are added: 70-90 parts EVA; 10-30 parts vinyl chloride resin; 2.0-5.0 parts compatibilizer; 0.1-0.3 parts crosslinking agent; 1.0-3.0 parts nanofiller; 0.2-0.5 parts antioxidant; 0.2-0.4 parts lubricant; and supercritical carbon dioxide at a weight of 3.0-5.0 wt% of the total weight of EVA and vinyl chloride resin. The chloroacetic acid resin is a binary chloroacetic acid and a hydroxyl ternary chloroacetic acid in a mass ratio of (5-10):1; The acrylate prepolymer contains chemical groups that can be chemically bonded to hydroxyl groups, and the chemical groups are isocyanate groups and / or epoxy groups.

[0025] The tackifying resin is one or a mixture of two or more of hydrogenated rosin, hydrogenated rosin ester, and hydrogenated terpene resin; the tackifying resin used in the following examples of the present invention is hydrogenated rosin (product name: RHHR; purchased from Guangxi Dinghong Resin Co., Ltd.).

[0026] The photoinitiator is photoinitiator 184, photoinitiator 1173, photoinitiator TPO, or photoinitiator 819; and the photoinitiator used in the following embodiments of the present invention is photoinitiator 184.

[0027] The reactive diluents used in the following embodiments of the present invention are trimethylolpropane triacrylate, tripropylene glycol diacrylate, and isobornyl acrylate added in a mass ratio of 2:3:1.

[0028] The VA content in the EVA used in this invention is 35-40%. The EVA used in the following examples of this invention is EVA40W, which was purchased from Mitsui, Japan.

[0029] The VA content in the binary chloroacetate of this invention is 10-15%; it can be of the following types: CK, RC, B62, B72, BCK, etc.; the binary chloroacetate used in the following examples of this invention is of the RC type, which was purchased from Wuxi Honghui New Material Technology Co., Ltd.

[0030] The hydroxy terchloroacetate in this invention can be S16 / 48A or S16 / 53A; and the hydroxy terchloroacetate used in the following embodiments of this invention is model S16 / 48A, which was purchased from Wuxi Honghui New Material Technology Co., Ltd.

[0031] The compatibilizer is EVA-g-MAH and CPE in a mass ratio of 2-3:1.

[0032] The EVA-g-MAH, model E418, used in the following embodiments of the present invention was purchased from Dow Chemical.

[0033] In the following embodiments of the present invention, the CPE used is CPE135A, which was purchased from Weifang Yaxing Chemical Co., Ltd.

[0034] The crosslinking agent can be benzoyl peroxide, 2,5-dimethyl-2,5-bis(benzoylperoxy)hexane, dicyclohexyl peroxycarbonate, or diisopropylbenzene peroxide, etc.; the crosslinking agent used in the following examples of the present invention is 2,5-dimethyl-2,5-bis(benzoylperoxy)hexane.

[0035] The nanofiller can be nano-silica or nano-calcium carbonate; the nano-silica used in the following embodiments of the present invention has the product number JL-SiO2-N20, an average particle size of 20nm, and was purchased from Ningbo Jinlei Nanomaterials Technology Co., Ltd.

[0036] The antioxidants used in the following embodiments of the present invention are antioxidants 1010 and antioxidants 168 added at a mass ratio of 1:2.

[0037] The lubricant used in the following embodiments of the present invention is oxidized polyethylene wax, model VISCOCER@ 2016, purchased from Ceronas GmbH, Germany.

[0038] The release force of the transparent PET release film layer used in this invention is 10-18 gf / 25 mm; too low a release force is not conducive to the coating and construction of the UV-cured acrylic pressure-sensitive adhesive layer; too high a release force is not conducive to peeling. The transparent PET release film used in the following embodiments of this invention, model 3509, was purchased from Fulei New Materials.

[0039] This invention also provides a process for preparing the above-mentioned high peel strength microporous sponge tape, comprising the following steps: S1, Prepare UV-curable acrylic pressure-sensitive adhesive; S2, Preparation of sponge substrate; S3, uniformly coat one side of the transparent PET release film with UV-cured acrylic pressure-sensitive adhesive; S4, heat-press the side of the transparent PET release film coated with UV adhesive to the sponge substrate; S5, after UV curing, aging and slitting of the composite material, a microporous sponge tape with high peel strength is obtained.

[0040] The specific steps of S1 are as follows: S11: Under nitrogen protection, add the mixed solvent of ethyl acetate and toluene in a volume ratio of 6:4 into the reactor, heat to 75-85℃, add photoinitiator BPO into the mixed solvent, and stir (150-300 rpm) until uniform. S12: After the acrylate monomers are mixed evenly, a mixed monomer is obtained. The mixed monomers accounting for 35-45 wt% of the total mass of the mixed monomers are added to the reaction system of step (1) for polymerization reaction. After stirring the polymerization reaction for 20-40 min, the remaining mixed monomers are added dropwise to the reaction system within 1-3 h and stirring (200-400 rpm) is continued for polymerization reaction until the viscosity of the reaction system at 25℃ reaches 8000-10000 mPa·s. The reaction ends and the acrylate prepolymer is obtained. The acrylate monomers in this invention are ethyl isocyanate methacrylate, glycidyl methacrylate, butyl acrylate, methyl methacrylate, and dicyclopentyl methacrylate added in a mass ratio of 1.5:(0-1):3:2:1. S13: Add tackifying resin, reactive diluent and photoinitiator to the acrylate prepolymer, stir at 20-40℃ (200-500rpm) for 20-60min to obtain UV-curable acrylate pressure-sensitive adhesive.

[0041] Furthermore, step S2 employs an extrusion foaming process to prepare the sponge substrate, as detailed below: S21: Weigh out EVA, vinyl chloride resin, compatibilizer, crosslinking agent, nanofiller, antioxidant and lubricant according to the formula, and mix them evenly (mix in a high-speed mixer at 300-800 rpm for 5-15 min) to obtain the premixed material; S22: The premixed material is fed into a twin-screw extruder for melt plasticization and granulation to obtain granules. The length-to-diameter ratio of the extruder is 32:1-40:1, the screw speed is 200-350 rpm, and the temperatures of each zone are controlled as follows: 95-105℃ / 105-115℃ / 110-120℃ / 115-125℃ / 120-130℃ / 120-130℃ / 125-135℃ / 125-135℃; the die head temperature is 120-130℃. S23: The granules are fed into the foaming equipment of a single-screw extruder. Supercritical carbon dioxide is injected into the extruder melt in zone 4 or zone 5 of the extruder using a supercritical carbon dioxide metering pump. The injection pressure is 10-18 MPa. The material is then further mixed in the barrel to form a homogeneous foamed material. The single-screw extruder has a length-to-diameter ratio of 28:1-36:1, a screw speed of 40-80 rpm, and zone temperatures of 90-105℃ / 100-115℃ / 110-125℃ / 115-130℃ / 110-125℃ / 105-120℃. The die head temperature is 105-120℃. S24: Homogeneous foamed material is extruded through a die and foamed into sheets, which are then sequentially subjected to three-roll light pressing for thickness determination and surface leveling, cooling, traction, and winding to obtain the sponge substrate (thickness 0.5-2.0 mm). The three-roll temperatures are: 40-60℃ / 25-40℃ / 15-25℃; the three-roll linear pressure is: 0.10-0.30 MPa; and the traction speed is: 4-8 m / min.

[0042] The specific steps of S3 are as follows: S31: Using slit coating, the UV-curable acrylic pressure-sensitive adhesive is added to a mixed solvent (V / V=2 / 1) formed by butyl acetate / methyl isobutyl ketone and adjusted to a coatable viscosity. It is then uniformly coated on one side of the transparent PET release film. The adhesive coating temperature is 25-45℃, the oven segment temperature is 60-80℃ / 80-100℃ / 100-120℃, the wind speed is 5-15m / s, the linear velocity is 5-20m / min, and the adhesive layer thickness is controlled to be 50-150μm.

[0043] The specific steps in S4 are as follows: S41: The side of the transparent PET release film coated with UV adhesive is bonded to the sponge substrate to obtain a composite material; The composite temperature is 40-60℃. The composite pressure is 0.3-0.5MPa; the composite linear velocity is 10-15m / min.

[0044] The specific steps in S5 are as follows: S51: The composite material is UV-cured to obtain a UV-cured composite material, wherein the UV curing energy is 500-1500 mJ / cm². 2 The UV wavelength is 365nm. S52: After curing, slitting or die-cutting, the photocurable composite material is used to obtain a microporous sponge tape with high peel strength of the required size; The curing process is carried out in a curing chamber at a temperature of 50-70°C for 12-36 hours.

[0045] To further understand the present invention, the following detailed description of a high peel strength microporous sponge tape provided by the present invention is provided in conjunction with specific embodiments. The scope of protection of the present invention is not limited by the following embodiments.

[0046] Example 1

[0047] A high peel strength microporous sponge tape has a layered structure, comprising, from top to bottom, a transparent PET release film, a UV-cured acrylic pressure-sensitive adhesive layer, and a sponge substrate layer; The UV-curable acrylic pressure-sensitive adhesive layer is composed of the following raw materials in parts by weight: 90 parts acrylate prepolymer; 20 parts tackifying resin; 2.0 parts photoinitiator; 15 parts reactive diluent; The sponge substrate layer is composed of the following raw materials in parts by weight: 80 parts EVA; 20 parts vinyl chloride resin; 3.0 parts compatibilizer; 0.2 parts crosslinking agent; 2.0 parts nanofiller; 0.35 parts antioxidant; 0.3 parts lubricant; The chloroacetic acid resin is composed of binary chloroacetic acid RC and hydroxyl ternary chloroacetic acid S16 / 48A in a mass ratio of 8:1. The compatibilizer is EVA-g-MAH and CPE in a mass ratio of 2.5:1.

[0048] The preparation process of the above-mentioned high peel strength microporous sponge tape is as follows: S1, Prepare UV-curable acrylic pressure-sensitive adhesive; S2, Preparation of sponge substrate; S3, uniformly coat one side of the transparent PET release film with UV-cured acrylic pressure-sensitive adhesive; S4, the side of the transparent PET release film coated with UV adhesive is bonded to the sponge substrate; S5, the composite material is sequentially UV cured, aged, and slit to obtain a microporous sponge tape with high peel strength.

[0049] The specific steps in S1 are as follows: S11: Under nitrogen protection, a mixed solvent of ethyl acetate and toluene in a volume ratio of 6:4 is added to the reactor, the temperature is raised to 80°C, and initiator BPO is added. The mixture is stirred at 240 rpm until homogeneous. The amount of the initiator BPO is 2 wt% of the acrylate monomer; S12: After the acrylate monomers are mixed evenly, a mixed monomer is obtained. 40 wt% of the mixed monomers are added to the reactor for polymerization. After stirring and polymerization for 30 min, the remaining mixed monomers are added dropwise while stirring over 2 h. After the addition is completed, stirring is continued (300 rpm) until the viscosity of the reactant at 25 °C reaches 9000 mPa·s. The reaction is then completed, and the acrylate prepolymer is obtained. The acrylate monomers are composed of isocyanate methacrylate, glycidyl methacrylate, butyl acrylate, methyl methacrylate, and dicyclopentyl methacrylate in a mass ratio of 1.5:0.5:3:2:1. S13: Add tackifying resin, reactive diluent, and photoinitiator to the acrylate prepolymer according to the formula amount, and stir at 350 rpm for 40 min at 30°C to obtain UV-curable acrylate pressure-sensitive adhesive.

[0050] Step S2 uses an extrusion foaming process to prepare the sponge substrate, as detailed below: S21: Weigh out EVA, vinyl chloride resin, compatibilizer, crosslinking agent, nanofiller, antioxidant and lubricant according to the formula, and mix them in a high-speed mixer at 500 rpm for 10 min; S22: The premixed material is fed into a twin-screw extruder for melt plasticizing and granulation. The length-to-diameter ratio of the extruder is 36:1, the screw speed is 280 rpm, and the temperatures of each temperature zone are controlled at 100℃ / 110℃ / 115℃ / 120℃ / 125℃ / 125℃ / 130℃ / 130℃ respectively; the die head temperature is 125℃. S23: The granules are fed into the foaming equipment of a single-screw extruder. Supercritical carbon dioxide is injected into the extruder melt in zone 5 through a supercritical carbon dioxide metering pump at an injection pressure of 14 MPa. The material is then further mixed in the barrel to form a homogeneous foamed material. The extruder has a length-to-diameter ratio of 32:1, a screw speed of 60 rpm, and zone temperatures of 95℃ / 105℃ / 115℃ / 125℃ / 120℃ / 110℃. The die temperature is 110℃. The amount of supercritical carbon dioxide added is 4.0 wt% of the total weight of EVA and vinyl chloride resin. S24: The homogeneous foamed material is extruded through a die and foamed into a sheet, which is then subjected to three-roll light pressing for thickness determination and surface leveling, cooling, traction and winding to obtain the sponge substrate (thickness of 1.0 mm). The three-roller temperature is 50℃ / 35℃ / 20℃; the three-roller linear pressure is 0.20MPa; and the traction speed is 6m / min.

[0051] The specific steps for S3 are as follows: S31: Using slit coating, UV-curable acrylic pressure-sensitive adhesive is added to a mixed solvent of butyl acetate and methyl isobutyl ketone (V / V=2 / 1) and adjusted to a coatable viscosity (2000 mPa·s). It is then uniformly coated onto the surface of a transparent PET release film. The adhesive coating temperature is 35℃, the oven segment temperatures are 70℃ / 90℃ / 110℃, the air velocity is 10 m / s, the linear velocity is 10 m / min, and the adhesive layer thickness is controlled to be 100 μm.

[0052] The specific steps for S4 are as follows: S41: Composite a transparent PET release film layer coated with UV adhesive with a sponge substrate; The composite temperature is 50℃; the composite pressure is 0.4MPa; and the composite linear speed is 12m / min.

[0053] The specific steps in S5 are as follows: S51: The composite material is UV-cured, wherein the UV curing energy is 1000 mJ / cm². 2 The UV wavelength is 365nm. S52: After curing and slitting, the high peel strength microporous sponge tape is obtained; The curing process is carried out in a curing chamber at a temperature of 60°C for 24 hours.

[0054] Example 2

[0055] A high peel strength microporous sponge tape has a layered structure, comprising, from top to bottom, a transparent PET release film, a UV-cured acrylic pressure-sensitive adhesive layer, and a sponge substrate layer; The UV-curable acrylic pressure-sensitive adhesive layer is composed of the following raw materials in parts by weight: 80 parts acrylate prepolymer; 25 parts tackifying resin; 1.0 part photoinitiator; 10 parts reactive diluent; The sponge substrate layer is composed of the following raw materials in parts by weight: 90 parts EVA; 10 parts vinyl chloride resin; 2.0 parts compatibilizer; 0.3 parts crosslinking agent; 1.0 part nanofiller; 0.2 parts antioxidant; 0.4 parts lubricant; The chloroacetic acid resin is composed of binary chloroacetic acid RC and hydroxyl ternary chloroacetic acid S16 / 48A in a mass ratio of 8:1. The compatibilizer is EVA-g-MAH and CPE in a mass ratio of 2.5:1.

[0056] The preparation process of the above-mentioned high peel strength microporous sponge tape is as follows: S1, Prepare UV-curable acrylic pressure-sensitive adhesive; S2, Preparation of sponge substrate; S3, uniformly coat the UV-cured acrylic pressure-sensitive adhesive layer onto one side of the transparent PET release film; S4, the side of the transparent PET release film coated with UV adhesive is bonded to the sponge substrate; S5, after the composite material is successively subjected to UV curing, aging and slitting, a microporous sponge tape with high peel strength is obtained.

[0057] The specific steps in S1 are as follows: S11: Under nitrogen protection, a mixed solvent of ethyl acetate and toluene in a volume ratio of 6:4 is added to the reactor, the temperature is raised to 75°C, and initiator BPO is added. The mixture is stirred at 150 rpm until homogeneous. The amount of the initiator BPO is 2 wt% of the acrylate monomer; S12: After the acrylate monomers are mixed evenly, a mixed monomer is obtained. 35 wt% of the mixed monomers are added to the reactor for polymerization. After stirring and polymerization for 30 min, the remaining mixed monomers are added dropwise while stirring over 3 h. After the addition is completed, stirring is continued (200 rpm) until the viscosity of the reactant at 25 °C reaches 8000 mPa·s. The reaction is then completed, and the acrylate prepolymer is obtained. The acrylate monomers are composed of isocyanate methacrylate, glycidyl methacrylate, butyl acrylate, methyl methacrylate, and dicyclopentyl methacrylate in a mass ratio of 1.5:1:3:2:1. S13: Add tackifying resin, reactive diluent, and photoinitiator to the acrylate prepolymer according to the formula amount, and stir at 500 rpm for 20 min at 30°C to obtain UV-curable acrylate pressure-sensitive adhesive.

[0058] Step S2 uses an extrusion foaming process to prepare the sponge substrate, as detailed below: S21: Weigh out EVA, vinyl chloride resin, compatibilizer, crosslinking agent, nanofiller, antioxidant and lubricant according to the formula, and mix them in a high-speed mixer at 300 rpm for 15 min; S22: The premixed material is fed into a twin-screw extruder for melt plasticizing and granulation. The length-to-diameter ratio of the extruder is 36:1, the screw speed is 350 rpm, and the temperatures of each temperature zone are controlled at 95℃ / 105℃ / 110℃ / 115℃ / 120℃ / 120℃ / 125℃ / 125℃ respectively; the die head is 120℃. S23: The granules are fed into the foaming equipment of a single-screw extruder. Supercritical carbon dioxide is injected into the extruder melt in zone 5 through a supercritical carbon dioxide metering pump at an injection pressure of 10 MPa. The material is then further mixed in the barrel to form a homogeneous foamed material. The extruder has a length-to-diameter ratio of 28:1, a screw speed of 80 rpm, and zone temperatures of 90℃ / 100℃ / 110℃ / 115℃ / 110℃ / 105℃. The die temperature is 105℃. The amount of supercritical carbon dioxide added is 3.0 wt% of the total weight of EVA and vinyl chloride resin. S24: The homogeneous foamed material is extruded through a die and foamed into a sheet, which is then subjected to three-roll light pressing for thickness determination and surface leveling, cooling, traction and winding to obtain the sponge substrate (thickness of 0.5mm). The three-roller temperature is 40℃ / 25℃ / 15℃; the three-roller linear pressure is 0.10MPa; and the traction speed is 4m / min.

[0059] The specific steps for S3 are as follows: S31: Using slit coating, UV-curable acrylic pressure-sensitive adhesive is added to a mixed solvent of butyl acetate and methyl isobutyl ketone (V / V=2 / 1) and adjusted to a coatable viscosity (2000 mPa·s). It is then uniformly coated onto the surface of a transparent PET release film. The adhesive coating temperature is 25℃, the oven segment temperatures are 60℃ / 80℃ / 100℃, the air velocity is 15 m / s, the linear velocity is 5 m / min, and the adhesive layer thickness is controlled to be 50 μm.

[0060] The specific steps for S4 are as follows: S41: Composite a transparent PET release film layer coated with UV adhesive with a sponge substrate; The composite temperature is 40℃; the composite pressure is 0.5MPa; and the composite linear speed is 15m / min.

[0061] The specific steps in S5 are as follows: S51: The composite material is UV-cured, and the UV curing energy is 500 mJ / cm². 2 The UV wavelength is 365nm. S52: After curing and slitting, the high peel strength microporous sponge tape is obtained; The curing process is carried out in a curing chamber at a temperature of 70°C for 12 hours.

[0062] Example 3

[0063] A high peel strength microporous sponge tape has a layered structure, comprising, from top to bottom, a transparent PET release film, a UV-cured acrylic pressure-sensitive adhesive layer, and a sponge substrate layer; The UV-curable acrylic pressure-sensitive adhesive layer is composed of the following raw materials in parts by weight: 100 parts acrylate prepolymer; 15 parts tackifying resin; 3.0 parts photoinitiator; 20 parts reactive diluent; The sponge substrate layer is composed of the following raw materials in parts by weight: 70 parts EVA; 30 parts vinyl chloride resin; 5.0 parts compatibilizer; 0.1 parts crosslinking agent; 3.0 parts nanofiller; 0.5 parts antioxidant; 0.2 parts lubricant; The chloroacetic acid resin is composed of binary chloroacetic acid RC and hydroxyl ternary chloroacetic acid S16 / 48A in a mass ratio of 8:1. The compatibilizer is EVA-g-MAH and CPE in a mass ratio of 2.5:1.

[0064] The preparation process of the above-mentioned high peel strength microporous sponge tape is as follows: S1, Prepare UV-curable acrylic pressure-sensitive adhesive; S2, Preparation of sponge substrate; S3, uniformly coat one side of the transparent PET release film with UV-cured acrylic pressure-sensitive adhesive; S4, the side of the transparent PET release film coated with UV adhesive is bonded to the sponge substrate; S5, the composite material is sequentially UV cured, aged, and slit to obtain a microporous sponge tape with high peel strength.

[0065] The specific steps in S1 are as follows: S11: Under nitrogen protection, a mixed solvent of ethyl acetate and toluene in a volume ratio of 6:4 is added to the reactor, the temperature is raised to 75°C, and initiator BPO is added. The mixture is stirred at 300 rpm until homogeneous. The amount of the initiator BPO is 2 wt% of the acrylate monomer; S12: After the acrylate monomers are mixed evenly, a mixed monomer is obtained. 45 wt% of the mixed monomers are added to the reactor for polymerization. After stirring and polymerization for 30 min, the remaining mixed monomers are added dropwise while stirring over 1 h. After the addition is completed, stirring is continued (400 rpm) until the viscosity of the reactant at 25 °C reaches 10000 mPa·s. The reaction is then completed, and the acrylate prepolymer is obtained. The acrylate monomers are composed of ethyl isocyanate methacrylate, butyl acrylate, methyl methacrylate, and dicyclopentyl methacrylate in a mass ratio of 1.5:3:2:1. S13: Add tackifying resin, reactive diluent, and photoinitiator to the acrylate prepolymer according to the formula amount, and stir at 200 rpm for 60 min at 40°C to obtain UV-curable acrylate pressure-sensitive adhesive.

[0066] Step S2 uses an extrusion foaming process to prepare the sponge substrate, as detailed below: S21: Weigh out EVA, vinyl chloride resin, compatibilizer, crosslinking agent, nanofiller, antioxidant and lubricant according to the formula, and mix them in a high-speed mixer at 800 rpm for 5 min; S22: The premixed material is fed into a twin-screw extruder for melt plasticizing and granulation. The length-to-diameter ratio of the extruder is 36:1, the screw speed is 200 rpm, and the temperatures of each temperature zone are controlled at 105℃ / 115℃ / 120℃ / 125℃ / 130℃ / 130℃ / 135℃ / 135℃ respectively; the die head temperature is 130℃. S23: The granules are fed into the foaming equipment of a single-screw extruder. Supercritical carbon dioxide is injected into the extruder melt in zone 5 through a supercritical carbon dioxide metering pump at an injection pressure of 18 MPa. The material is then further mixed in the barrel to form a homogeneous foamed material. The extruder has a length-to-diameter ratio of 36:1, a screw speed of 40 rpm, and zone temperatures of 105℃ / 115℃ / 125℃ / 130℃ / 125℃ / 120℃. The die temperature is 120℃. The amount of supercritical carbon dioxide added is 5.0 wt% of the total weight of EVA and vinyl chloride resin. S24: The homogeneous foamed material is extruded through a die and foamed into a sheet, which is then subjected to three-roll light pressing for thickness determination and surface leveling, cooling, traction and winding to obtain the sponge substrate (thickness of 2mm). The three-roller temperature is 60℃ / 40℃ / 25℃; the three-roller linear pressure is 0.3MPa; and the traction speed is 8m / min.

[0067] The specific steps for S3 are as follows: S31: Using slit coating, UV-curable acrylic pressure-sensitive adhesive is added to a mixed solvent of butyl acetate and methyl isobutyl ketone (V / V=2 / 1) and adjusted to a coatable viscosity (2000 mPa·s). It is then uniformly coated onto the surface of a transparent PET release film. The adhesive coating temperature is 45℃, the oven segment temperatures are 80℃ / 100℃ / 120℃, the air velocity is 5 m / s, the linear velocity is 20 m / min, and the adhesive layer thickness is controlled to be 150 μm.

[0068] The specific steps for S4 are as follows: S41: Composite a transparent PET release film layer coated with UV adhesive with a sponge substrate; The composite temperature is 60℃; the composite pressure is 0.3MPa; and the composite linear velocity is 10m / min.

[0069] The specific steps in S5 are as follows: S51: The composite material is UV-cured, and the UV curing energy is 1500 mJ / cm². 2 The UV wavelength is 365nm. S52: After curing and slitting, the high peel strength microporous sponge tape is obtained; The curing process is carried out in a curing chamber at a temperature of 50°C for 36 hours.

[0070] Example 4

[0071] Everything else is the same as in Example 1, except that: The chloroacetic acid resin in Example 4 is composed of binary chloroacetic acid RC and hydroxyl ternary chloroacetic acid S16 / 48A in a mass ratio of 5:1.

[0072] Example 5

[0073] Everything else is the same as in Example 1, except that: The chloroacetic acid resin in Example 5 is composed of binary chloroacetic acid RC and hydroxyl ternary chloroacetic acid S16 / 48A in a mass ratio of 10:1.

[0074] Example 6

[0075] Everything else is the same as in Example 1, except that: The compatibilizer in Example 6 is composed of EVA-g-MAH and CPE in a mass ratio of 2:1.

[0076] Example 7

[0077] Everything else is the same as in Example 1, except that: The compatibilizer in Example 7 is composed of EVA-g-MAH and CPE in a mass ratio of 3:1.

[0078] The following comparisons are all compared with Example 1: Comparative Example 1 Everything else is the same as in Example 1, except that: In Comparative Example 1, neither isocyanate methacrylate nor glycidyl methacrylate was added. The acrylate monomers in Comparative Example 1 were added from butyl acrylate, methyl methacrylate, and dicyclopentyl methacrylate in a mass ratio of 3:2:1.

[0079] Comparative Example 2 Everything else is the same as in Example 1, except that: No chloroacetic acid resin was added to the sponge substrate formulation of Comparative Example 2.

[0080] Comparative Example 3 Everything else is the same as in Example 1, except that: The chloroacetic acid resin in Comparative Example 3 is only a binary chloroacetic acid RC.

[0081] Comparative Example 4 Everything else is the same as in Example 1, except that: The chloroacetic acid resin in Comparative Example 4 was only hydroxyl ternary chloroacetic acid S16 / 48A.

[0082] Comparative Example 5 Everything else is the same as in Example 1, except that: The compatibilizer in Comparative Example 5 was only EVA-g-MAH.

[0083] Comparative Example 6 Everything else is the same as in Example 1, except that: The compatibilizer in Comparative Example 6 was only CPE.

[0084] Comparative Example 7 Everything else is the same as in Example 1, except that: In Comparative Example 7, the oven temperature for each section of the slit coating process was 110℃.

[0085] Performance testing: The microporous sponge tapes obtained in the embodiments and comparative examples of the present invention were subjected to relevant performance tests, and the test results are shown in Table 1.

[0086] The testing method is as follows: (1) Bubble diameter: Tested according to the method described in GB / T 12811-2025.

[0087] (2) Closed-cell ratio: Tested according to GB / T 10799-2008.

[0088] (3) Initial tack: Tested according to the method described in GB / T 4852-2002. The rolling ball method was used, with the inclined plane set at 20°.

[0089] (4) 180° peel strength: Tested according to the method described in GB / T 2792-2014. Stainless steel plate was used for testing.

[0090] (5) 180° peel strength retention rate: After the sample is subjected to damp heat aging, the peel strength is retested and the retention rate is calculated. Among them, the damp heat aging is carried out on the finished tape according to GB / T 32368-2015.

[0091] (6) Heat shrinkage rate: Tested in accordance with GB / T 8811-2008.

[0092] Table 1 Performance Test Results

[0093] The above test results show that the high peel strength microporous sponge tapes obtained in the embodiments of the present invention simultaneously possess high initial tack, 180° peel strength, peel strength retention rate after wet heat aging, and low heat shrinkage rate. Specifically, the average pore size of Examples 1-7 is controlled at 36.8-58.6 μm, the closed-cell rate is 81.4-88.9%, the initial tack reaches 16#-20#, the 180° peel strength is 15.8-17.4 N / 25 mm, the aging retention rate is 89.2%-92.2%, and the heat shrinkage rate is 3.2%-4.5%. This indicates that the present invention not only obtains a relatively uniform cell structure and a relatively complete closed-cell state, but also has good rapid adhesion ability, interfacial peel strength, and long-term service stability.

[0094] Secondly, comparing Example 1 with Comparative Example 1 shows that the reactive acrylate prepolymer and chloroacetic acid resin compound system plays a key role in improving peel strength and aging retention rate, indicating that reactive groups play a decisive role in improving the interfacial anchoring ability between the adhesive layer and the sponge substrate.

[0095] Comparing Example 1 with Comparative Examples 2-4, it can be seen that chloroacetic acid resins not only participate in interfacial interactions, but also have a positive effect on the refinement of cell structure, dimensional stability, and polarity enhancement of sponge substrates. Among them, binary chloroacetic acid resins are more inclined to dimensional stability and polarity regulation, while hydroxyl ternary chloroacetic acid resins provide interfacial reaction sites. Only by combining the two can the cell structure, thermal shrinkage control, and interfacial adhesion enhancement be balanced.

[0096] Comparing Example 1 with Comparative Examples 5-6, it can be seen that the compatibilizer EVA-g-MAH provides both polar compatibility and interfacial bonding ability, while CPE helps to improve the blending uniformity and foaming processing stability of vinyl chloride resin and EVA. When the two are compounded in an appropriate ratio, they can more effectively improve the structural stability of the sponge and the peeling performance of the final product.

[0097] A comparison of Example 1 and Comparative Example 7 shows that the UV adhesive layer application process also has a significant impact on the final performance. Segmented heating and drying, compared to single high-temperature drying, is more conducive to the stable evaporation of solvents while promoting solvent wetting and penetration into the substrate, uniform adhesive film formation, and stable interfacial bonding, thereby achieving better overall adhesion performance.

[0098] In summary, the microporous sponge tape obtained by this invention exhibits high initial tack, high 180° peel strength, excellent retention rate after wet heat aging, and low heat shrinkage rate, demonstrating good initial bonding performance, interfacial composite reliability, and long-term use stability.

[0099] Based on the above-described preferred embodiments of the present invention, and through the foregoing description, those skilled in the art can make various changes and modifications without departing from the inventive concept. The technical scope of this invention is not limited to the contents of the specification, but must be determined according to the scope of the claims.

Claims

1. A microporous sponge tape with high peel strength, characterized in that, It has a layered structure, consisting of a transparent PET release film, a UV-cured acrylic pressure-sensitive adhesive layer, and a sponge substrate layer from top to bottom; The UV-curable acrylic pressure-sensitive adhesive layer is composed of the following raw materials in parts by weight: 80-100 parts acrylic prepolymer; 15-25 parts tackifying resin; 1.0-3.0 parts photoinitiator; and 10-20 parts reactive diluent. The sponge substrate is composed of the following raw materials in parts by weight: 70-90 parts EVA; 10-30 parts vinyl chloride resin; 2.0-5.0 parts compatibilizer; 0.1-0.3 parts crosslinking agent; 1.0-3.0 parts nanofiller; 0.2-0.5 parts antioxidant; 0.2-0.4 parts lubricant; The chloroacetic acid resin is composed of a binary chloroacetic acid resin and a hydroxyl ternary chloroacetic acid resin in a mass ratio of 5-10:1; the acrylate prepolymer is a reactive acrylate prepolymer, and its molecular structure contains epoxy groups and / or isocyanate groups that can chemically bond with hydroxyl groups.

2. The high peel strength microporous sponge tape according to claim 1, characterized in that, The preparation method of acrylate prepolymer includes the following steps: (1) Under the protection of nitrogen or inert gas, add the mixed solvent formed by ethyl acetate and toluene into the reaction vessel, heat to 75-85℃, then add the initiator and stir evenly; (2) After the acrylate monomers are mixed evenly, a mixed monomer is obtained. First, 35-45 wt% of the mixed monomers are added to the above-mentioned reactor for free radical polymerization. After stirring the polymerization reaction for 20-40 min, the remaining mixed monomers are added dropwise while stirring for 1-3 h. After the dropwise addition is completed, the reaction is stirred until the viscosity of the reaction solution at 25℃ reaches 8000-10000 mPa·s. The reaction ends and the acrylate prepolymer is obtained. The acrylate monomers include butyl acrylate, methyl methacrylate and dicyclopentyl methacrylate. The acrylate monomers also include isocyanate ethyl methacrylate and / or glycidyl methacrylate.

3. The high peel strength microporous sponge tape according to claim 1, characterized in that, The VA content in EVA is 35-40%, while the VA content in dichloroethylene is 10-15%.

4. The high peel strength microporous sponge tape according to claim 1, characterized in that, The hydroxy terchloroacetic acid is designated as either S16 / 48A or S16 / 53A.

5. The high peel strength microporous sponge tape according to claim 1, characterized in that, The compatibilizer is composed of EVA-g-MAH and CPE in a mass ratio of 2-3:

1.

6. The high peel strength microporous sponge tape according to claim 1, characterized in that, The crosslinking agent is one or more of benzoyl peroxide, 2,5-dimethyl-2,5-bis(benzoylperoxy)hexane, dicyclohexyl peroxycarbonate, or dicumyl peroxide.

7. The high peel strength microporous sponge tape according to claim 1, characterized in that, The nanofiller is nano-silica or nano-calcium carbonate.

8. The high peel strength microporous sponge tape according to claim 1, characterized in that, The tackifying resin is one or a mixture of two or more of hydrogenated rosin, hydrogenated rosin ester, and hydrogenated terpene resin.

9. A high peel strength microporous sponge tape according to any one of claims 1-8, characterized in that, The preparation process includes the following steps: S1, Prepare UV-curable acrylic pressure-sensitive adhesive; S2, Preparation of sponge substrate; S3, uniformly coat the UV-cured acrylic pressure-sensitive adhesive layer onto the surface of the transparent PET release film; S4, bonding the side of the transparent PET release film coated with UV adhesive to the sponge substrate; S5. The composite material is then subjected to UV curing, aging, and slitting in sequence to obtain a microporous sponge tape with high peel strength.

10. A high peel strength microporous sponge tape according to claim 9, characterized in that, Step S3 is as follows: A slit coating method is used to disperse UV-curable acrylic pressure-sensitive adhesive in an organic solvent to form an adhesive solution, which is then uniformly coated on the surface of a transparent PET release film. After drying and removing the organic solvent, a UV adhesive layer is formed on the surface of the transparent PET release film. The adhesive coating temperature is 25-45℃, the oven segment temperature is 60-80℃ / 80-100℃ / 100-120℃, the air velocity is 5-15m / s, and the linear velocity is 5-20m / min.

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