Pressure-sensitive adhesive tape and preparation method thereof

Abstract

The invention discloses a pressure-sensitive adhesive tape which comprises a substrate layer, a pressure-sensitive adhesive layer and a protective film layer, the pressure-sensitive adhesive layer comprises the following components: an acrylate copolymer, natural rubber, a plasticizer, epoxy resin, an alcohol solvent, an antioxidant, a water-soluble additive, a heat sensitizer and an ultraviolet stabilizer; according to the pressure-sensitive adhesive tape, by optimizing the formula and matching the components, the technical bottlenecks of the pressure-sensitive adhesive tape in the aspects of adhesive force, durability, stability, environmental friendliness, processability and the like are solved, and the requirements of the market for high-performance, long-acting, safe and environment-friendly pressure-sensitive adhesive tapes are met.

Description

Technical Field

[0001] The present invention relates to a pressure - sensitive tape and a preparation method thereof. Background Art

[0002] As an adhesive material widely used in daily life and various industrial productions, the pressure - sensitive tape has the characteristic of being able to adhere to the surface of an object without heating or pressurization. It mainly consists of a base layer, a pressure - sensitive adhesive layer, and a protective film layer, among which the pressure - sensitive adhesive layer is the key to determining the performance of the tape. Although the common pressure - sensitive tape products on the current market have certain adhesiveness and application scope, there are still some technical defects in the actual use process, mainly including the following aspects:

[0003] In the pressure - sensitive adhesive formulations of many traditional pressure - sensitive tapes, the adhesive components are single, and it is often difficult to maintain good adhesion on the surfaces of different materials. On uneven surfaces or materials with low surface energy, the adhesion effect of traditional pressure - sensitive tapes is poor, and they are prone to falling off or peeling, affecting the use effect and product quality.

[0004] Due to long - term exposure to ultraviolet radiation and oxidation environment, the existing pressure - sensitive tapes are prone to problems such as aging of the adhesive layer and decrease in adhesion during use. These unstable factors severely limit the service life of the tape. Especially in outdoor or extreme climate conditions, its durability far fails to meet the actual needs.

[0005] Some traditional pressure - sensitive tapes may release harmful gases or pollute the environment during production and use. Especially in the use of solvent - based adhesives, the presence of volatile organic compounds (VOCs) poses a hidden danger to the environment and human health. Therefore, poor environmental protection has become a major defect of existing tape products.

[0006] During the production process of existing tapes, there are often problems such as uneven coating and bubble generation, which affect the finished product quality of the tape. At the same time, some tapes are difficult to peel off smoothly or produce adhesive residues during use, resulting in inconvenience for users during the application process. Especially in occasions where precise application and peeling operations are required, there is great inapplicability.

[0007] In some special application scenarios, temperature fluctuations have a greater impact on the performance of pressure - sensitive tapes. Traditional pressure - sensitive tapes often show insufficient adhesion or excessive adhesion in low - temperature or high - temperature environments, resulting in instability during use and reducing the adaptability and universality of the product. Summary of the Invention

[0008] The object of the present invention is to provide a pressure-sensitive tape and a preparation method thereof. By optimizing the formulation and the combination of components, the technical bottlenecks of the pressure-sensitive tape in terms of adhesion, durability, stability, environmental friendliness, and processability are solved, meeting the market demand for high-performance, long-lasting, safe and environmentally friendly pressure-sensitive tapes.

[0009] The technical solution adopted by the present invention to solve its technical problems is as follows:

[0010] A pressure-sensitive tape includes a base layer, a pressure-sensitive adhesive layer, and a protective film layer; the pressure-sensitive adhesive layer includes the following components: acrylate copolymer, natural rubber, plasticizer, epoxy resin, alcohol solvent, antioxidant, water-soluble additive, thermosensitive agent, and ultraviolet stabilizer.

[0011] Preferably, the pressure-sensitive adhesive layer includes the following components in parts by weight: 30-60 parts of acrylate copolymer, 10-30 parts of natural rubber, 5-15 parts of plasticizer, 1-5 parts of epoxy resin, 5-15 parts of alcohol solvent, 0.1-1 part of antioxidant, 0.5-3% parts of water-soluble additive, 0.5-2 parts of thermosensitive agent, and 0.1-2 parts of ultraviolet stabilizer.

[0012] Preferably, the base layer is made of polyester film, and the thickness of the base layer is 5 to 150 microns.

[0013] Preferably, the protective film layer is made of polyethylene, and the thickness of the protective film layer is 10 to 50 microns.

[0014] Preferably, the alcohol solvent is ethanol, isopropanol, or a combination thereof.

[0015] Preferably, the antioxidant is a controlled-release antioxidant.

[0016] Preferably, the water-soluble additive is polyvinyl alcohol, hydroxypropyl methylcellulose, or a combination thereof.

[0017] Preferably, the thermosensitive agent is a reversible thermosetting resin.

[0018] Preferably, the ultraviolet stabilizer is a benzophenone ultraviolet absorber.

[0019] Another technical problem to be solved by the present invention is to provide a preparation method of a pressure-sensitive tape, including the following steps:

[0020] Mix 30 - 60 parts by weight of acrylate copolymer, 10 - 30 parts of natural rubber, 5 - 15 parts of plasticizer, 1 - 5 parts of epoxy resin, 5 - 15 parts of alcohol solvent, 0.1 - 1 part of antioxidant, 0.5 - 3 parts of water-soluble additive, 0.5 - 2 parts of thermosensitive agent, and 0.1 - 2 parts of ultraviolet stabilizer. Heat to 60 - 80 °C and dissolve or disperse under stirring conditions to obtain a uniform pressure-sensitive adhesive solution or paste.

[0021] Uniformly coat the obtained pressure-sensitive adhesive solution on the surface of the pretreated base layer, with the coating amount controlled at 50 - 150 g / m² to form a pressure-sensitive adhesive layer.

[0022] Send the base layer coated with the pressure-sensitive adhesive layer into a drying device, set the temperature at 80 - 120 °C, and the drying time at 5 - 10 minutes to remove the solvent, cure the pressure-sensitive adhesive layer, and achieve the required adhesion strength.

[0023] Make a film from polyethylene material and form a protective film layer through hot pressing or coating process. The thickness of the protective film layer is 10 to 50 microns. Then, attach the protective film layer to the cured pressure-sensitive adhesive layer.

[0024] Cut the above composite material into the required width and length to finally obtain a pressure-sensitive tape product. The size after cutting is controlled within the range of 10 mm to 1000 mm in width and is wound and packaged.

[0025] The beneficial effects of the present invention are as follows:

[0026] By combining acrylate copolymer and natural rubber, the adhesion and flexibility of the adhesive are optimized, enabling the pressure-sensitive tape to achieve better pasting effects on various surfaces, especially the adhesion ability on uneven or low surface energy materials. The introduction of components such as epoxy resin, antioxidant, and ultraviolet stabilizer can effectively improve the weather resistance of the pressure-sensitive tape during long-term use, reduce the influence of ultraviolet and oxidation on the adhesive layer, and thus extend the service life and maintain the performance of the tape.

[0027] Using alcohol solvents (such as ethanol, isopropanol, etc.) as solvents can provide good fluidity and uniformity during the coating process, avoid unevenness and bubble problems in the adhesive layer, and at the same time ensure the easy peelability of the tape during application. The introduction of water-soluble additives improves the environmental friendliness of the tape, reduces the release of harmful substances during production and use, and meets the requirements of green environmental protection. By adding thermosensitive agents, the performance changes of the tape at different temperatures can be adjusted to ensure its stable adhesion performance in low or high temperature environments. Specific implementation method

[0029] The principles and features of the present invention will be described below. The examples given are only used to explain the present invention and are not intended to limit the scope of the present invention.

[0030] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by those skilled in the technical field to which the present invention belongs. The terms used in the specification of the present invention herein are only for the purpose of describing specific embodiments and are not intended to limit the present invention. The term "and / or" used herein includes any and all combinations of one or more of the related listed items.

[0031] Example 1

[0032] A pressure-sensitive tape, comprising a base layer, a pressure-sensitive adhesive layer and a protective film layer; the pressure-sensitive adhesive layer comprises the following components: acrylate copolymer: 50 parts, natural rubber: 20 parts, plasticizer: 10 parts, epoxy resin: 3 parts, alcohol solvent: 10 parts (a mixture of ethanol and isopropanol), antioxidant: 0.5 part (controlled-release antioxidant), water-soluble additive: 2 parts (polyvinyl alcohol), thermosensitive agent: 1 part (reversible thermosetting resin), ultraviolet stabilizer: 0.5 part (benzophenone ultraviolet absorber); base layer: polyester film, with a thickness of 50 microns; protective film layer: polyethylene, with a thickness of 20 microns.

[0033] A method for preparing a pressure-sensitive tape, comprising the following steps;

[0034] Mix each component in proportion, heat to 75 °C, and stir until the glue paste is uniform;

[0035] Uniformly coat the obtained glue paste on the surface of the polyester film, and control the coating amount at 120 g / m²;

[0036] Send the base layer coated with the glue paste into a drying device, set the temperature at 100 °C, and dry for 5 minutes to remove the solvent;

[0037] Form a polyethylene protective film layer with a thickness of 20 microns through a hot pressing process;

[0038] Attach the protective film layer to the cured pressure-sensitive adhesive layer, cut it into a pressure-sensitive tape product with a width of 200 mm, and perform winding packaging.

[0039] In this example, by using a controlled-release antioxidant and an ultraviolet stabilizer, the long-term stability of the pressure-sensitive tape is improved, and the aging phenomenon caused by oxidation or ultraviolet irradiation is avoided; the use of a mixed solvent of ethanol and isopropanol helps to provide good solubility and volatility, ensures the uniformity of the coating process, and improves the adhesion of the tape; the combination of the polyester film and the polyethylene protective film layer provides excellent mechanical strength and durability, and is suitable for a variety of application scenarios.

[0040] Example 2:

[0041] A pressure - sensitive tape, comprising a base layer, a pressure - sensitive adhesive layer, and a protective film layer; the pressure - sensitive adhesive layer comprises the following components: acrylate copolymer: 40 parts, natural rubber: 15 parts, plasticizer: 12 parts, epoxy resin: 2 parts, alcohol solvent: 8 parts (mainly isopropyl alcohol), antioxidant: 0.5 part (controlled - release antioxidant), water - soluble additive: 1.5 parts (hydroxypropyl methylcellulose), thermosensitive agent: 1 part (reversible thermosetting resin), ultraviolet stabilizer: 1 part (benzophenone - type ultraviolet absorber); base layer: polyester film, with a thickness of 100 microns; protective film layer: polyethylene, with a thickness of 30 microns.

[0042] A method for preparing a pressure - sensitive tape, comprising the following steps;

[0043] Mix each component in proportion, heat to 70 °C and stir until uniform to obtain a pressure - sensitive adhesive solution;

[0044] Uniformly coat the pressure - sensitive adhesive solution on the pretreated polyester film, with a coating amount of 100 g / m²;

[0045] Use a drying device at 80 °C to process for 5 minutes to remove the alcohol solvent and complete the curing of the adhesive layer;

[0046] The polyethylene film forms a protective film layer through a hot - pressing process, with a thickness of 30 microns;

[0047] Combine the protective film layer with the pressure - sensitive adhesive layer, cut into tapes with a width of 50 mm, and perform winding and packaging.

[0048] In this example, using a relatively thick polyester film and a relatively thick polyethylene protective film layer enhances the tensile strength and wear resistance of the pressure - sensitive tape, making it suitable for industrial fields and long - term use scenarios; using hydroxypropyl methylcellulose as a water - soluble additive not only improves the adhesion performance of the tape but also improves the solubility, ensuring uniform coating; due to the addition of an ultraviolet stabilizer, the ultraviolet resistance of the tape is improved, and the service life is extended.

[0049] Example 3:

[0050] A pressure-sensitive adhesive tape, comprising a base layer, a pressure-sensitive adhesive layer and a protective film layer; the pressure-sensitive adhesive layer comprises the following components: acrylate copolymer: 55 parts, natural rubber: 25 parts, plasticizer: 8 parts, epoxy resin: 4 parts, alcohol solvent: 12 parts (mainly ethanol), antioxidant: 0.2 parts (controlled-release antioxidant), water-soluble additive: 2 parts (polyvinyl alcohol), thermosensitive agent: 0.8 parts (reversible thermosetting resin), ultraviolet stabilizer: 0.3 parts (benzophenone ultraviolet absorber); base layer: polyester film, with a thickness of 70 microns; protective film layer: polyethylene, with a thickness of 15 microns.

[0051] A method for preparing a pressure-sensitive adhesive tape, comprising the following steps;

[0052] According to the formula ratio, mix each component, set the temperature at 80 °C, and stir until uniform to obtain a glue slurry;

[0053] Uniformly coat the glue slurry on the polyester film, with a coating amount of 110 g / m²;

[0054] Send it into a drying device, with a temperature of 100 °C, and dry for 8 minutes to remove the solvent and cure the adhesive layer;

[0055] The polyethylene protective film layer is formed by a coating process, with a thickness of 15 microns;

[0056] Combine the protective film layer with the pressure-sensitive adhesive layer, cut it into a tape with a width of 60 mm, and carry out winding and packaging.

[0057] In this embodiment, by optimizing the formula, it is possible to provide strong adhesion, while maintaining good flexibility and anti-aging performance; polyvinyl alcohol as a water-soluble additive provides better dispersibility and stability, which helps to improve the adhesion of the adhesive layer; by controlling the thickness of the protective film layer, it is ensured that the tape has good operability and durability, and is suitable for daily use.

[0058] Example 4:

[0059] A pressure-sensitive adhesive tape, comprising a base layer, a pressure-sensitive adhesive layer and a protective film layer; the pressure-sensitive adhesive layer comprises the following components: acrylate copolymer: 60 parts, natural rubber: 18 parts, plasticizer: 6 parts, epoxy resin: 3 parts, alcohol solvent: 10 parts (ethanol), antioxidant: 0.3 parts (controlled-release antioxidant), water-soluble additive: 1.5 parts (hydroxypropyl methylcellulose), thermosensitive agent: 1 part (reversible thermosetting resin), ultraviolet stabilizer: 0.7 parts (benzophenone ultraviolet absorber); base layer: polyester film, with a thickness of 40 microns; protective film layer: polyethylene, with a thickness of 25 microns.

[0060] A method for preparing a pressure-sensitive adhesive tape, comprising the following steps;

[0061] Mix the pressure - sensitive adhesive components according to the ratio, heat to 75°C and stir to obtain a uniform adhesive paste;

[0062] Uniformly coat the adhesive paste on the polyester film, with a coating amount of 150 g / m²;

[0063] Feed it into the drying equipment at a temperature of 100°C and dry for 7 minutes to remove the solvent and cure the adhesive layer;

[0064] The polyethylene protective film layer is formed by a hot - pressing process, with a thickness of 25 μm;

[0065] Combine the protective film layer with the pressure - sensitive adhesive layer, cut it into a tape 80 mm wide, and carry out winding packaging.

[0066] Use a polyester film with a thickness of 40 μm to make the tape have stronger bearing capacity and be suitable for applications requiring higher tensile strength and wear resistance; Polyvinyl alcohol as a water - soluble additive improves the lubricity and operability of the tape, making the tape more smooth during the winding process; The use of ultraviolet stabilizers significantly improves the stability and durability of the tape in outdoor or long - term ultraviolet - irradiated environments.

[0067] Example 5:

[0068] A pressure - sensitive tape, comprising a base layer, a pressure - sensitive adhesive layer and a protective film layer; The pressure - sensitive adhesive layer comprises the following components: acrylate copolymer: 45 parts, natural rubber: 20 parts, plasticizer: 9 parts, epoxy resin: 2 parts, alcohol solvent: 8 parts (isopropyl alcohol), antioxidant: 0.5 part (controlled - release antioxidant), water - soluble additive: 2.5 parts (polyvinyl alcohol), thermosensitive agent: 1.5 parts (reversible thermosetting resin), ultraviolet stabilizer: 0.2 part (benzophenone - type ultraviolet absorber); Base layer: polyester film, with a thickness of 60 μm; Protective film layer: polyethylene, with a thickness of 30 μm.

[0069] A preparation method of a pressure - sensitive tape, comprising the following steps;

[0070] Mix each component according to the ratio, heat to 80°C and stir evenly to obtain an adhesive paste.

[0071] Uniformly coat the adhesive paste on the surface of the polyester film, with a coating amount of 130 g / m².

[0072] Feed it into the drying equipment at a temperature of 100°C and dry for 7 minutes to remove the solvent and cure the adhesive layer.

[0073] The polyethylene protective film layer is formed by a coating process, with a thickness of 30 μm.

[0074] Cover the protective film layer on the pressure - sensitive adhesive layer, cut it into a tape with a width of 100 mm, and carry out winding packaging.

[0075] In this embodiment, by reasonably configuring natural rubber and plasticizer, the pressure-sensitive tape has good flexibility and adhesion, and can meet different surface bonding requirements; the use of polyvinyl alcohol improves the dispersibility of the adhesive layer, enables uniform coating, and enhances the aging resistance of the tape; by increasing the thickness of the protective film layer, the durability and tear resistance of the pressure-sensitive tape are improved, making it suitable for long-term use.

[0076] Example 6:

[0077] A pressure-sensitive tape, comprising a base layer, a pressure-sensitive adhesive layer and a protective film layer; the pressure-sensitive adhesive layer comprises the following components: acrylate copolymer: 50 parts, natural rubber: 15 parts, plasticizer: 8 parts, epoxy resin: 4 parts, alcohol solvent: 10 parts (isopropyl alcohol), antioxidant: 0.8 parts (controlled-release antioxidant), water-soluble additive: 2 parts (hydroxypropyl methylcellulose), thermosensitive agent: 1 part (reversible thermosetting resin), ultraviolet stabilizer: 0.5 parts (benzophenone ultraviolet absorber); base layer: polyester film, with a thickness of 80 microns; protective film layer: polyethylene, with a thickness of 40 microns.

[0078] A preparation method of a pressure-sensitive tape, comprising the following steps;

[0079] Mix each component in proportion, heat to 80 °C and stir evenly to obtain a pressure-sensitive adhesive solution;

[0080] Coat the pressure-sensitive adhesive solution on the surface of the polyester film, with a coating amount of 140 g / m²;

[0081] Feed the base layer coated with the adhesive layer into a drying device, with a temperature of 110 °C and a drying time of 6 minutes;

[0082] The polyethylene protective film layer is formed by a hot pressing process, with a thickness of 40 microns;

[0083] Combine the protective film layer with the pressure-sensitive adhesive layer, cut into a tape with a width of 120 mm, and carry out winding packaging.

[0084] By increasing the thickness of the polyester film and the protective film layer, the strength, durability and tear resistance of the pressure-sensitive tape are significantly improved; the use of reversible thermosetting resin as a thermosensitive agent ensures that the tape can be quickly cured after heating to achieve the expected adhesion strength; the application of ultraviolet stabilizer effectively extends the service life of the tape under strong sunlight and prevents fading or performance degradation caused by ultraviolet rays.

[0085] Experimental example

[0086] Test materials:

[0087] Existing common pressure-sensitive tapes as the control group

[0088] Tape samples of Examples 1 to 6

[0089] Experimental procedures:

[0090] Adhesion test (surface adhesion)

[0091] Using an adhesion tester, measure the adhesion of Examples 1-6 and the existing tape on different material surfaces. The test surfaces include: low surface energy materials (such as polyethylene film, polypropylene film), and uneven surfaces (such as rough metal surfaces, wood surfaces).

[0092] Results:

[0093] Through the adhesive that combines acrylate copolymer and natural rubber, Examples 1-6 show higher adhesion on low surface energy and uneven material surfaces, and the adhesion is increased by about 15%-30% compared to the existing tape on these surfaces.

[0094] Especially on uneven metal and wood surfaces, the tapes in the examples show better adhesion and stronger anti-peeling properties, performing better than the existing tape.

[0095] Weather resistance test (ultraviolet and oxidative aging)

[0096] Put the samples of Examples 1-6 and the existing tape into an ultraviolet aging chamber to simulate long-term ultraviolet irradiation and oxidative environment, and conduct a 72-hour ultraviolet irradiation test. Test the changes in the adhesive layer after aging, including the color of the adhesive layer, adhesion change, and peel strength.

[0097] Results:

[0098] Examples 1-6 that introduce epoxy resin, antioxidant, and ultraviolet stabilizer have much lower aging degree of the adhesive layer after ultraviolet irradiation than the existing tape. There are fewer oxidation and discoloration phenomena on the tape surface, and the changes in adhesion and peel strength are smaller.

[0099] Compared with the existing tape, the weather resistance of Examples 1-6 is improved by 20%-40%, showing strong anti-ultraviolet and antioxidant properties.

[0100] Flowability and uniformity test (flowability and bubble problems during coating process)

[0101] Using a tape coater, test the coating uniformity of the pastes of Examples 1-6, and check the bubble problems during the coating process through a bubble detection instrument.

[0102] Results:

[0103] After using alcohol solvents (such as ethanol, isopropanol), the pastes of Examples 1-6 have good flowability during the coating process, are coated evenly, and the bubble problems are significantly reduced.

[0104] Due to the use of unstable solvents in existing tapes, there are certain unevenness and bubble phenomena during the coating process, resulting in unstable adhesion of the final product.

[0105] Environmental protection test (hazardous substance release amount)

[0106] Use an environmental protection test instrument to detect the release amount of hazardous substances in Examples 1-6 and existing tapes, especially the emission amount of volatile organic compounds (VOCs).

[0107] Results:

[0108] By introducing water-soluble additives (such as polyvinyl alcohol, hydroxypropyl methylcellulose, etc.) in Examples 1-6, the release of hazardous substances during the production and use of the tape is significantly reduced, meeting the requirements of green environmental protection.

[0109] Compared with the existing tape, the VOC release amount is higher and the environmental protection performance is poorer.

[0110] Temperature stability test (high and low temperature adhesion stability)

[0111] Put the samples of Examples 1-6 and the existing tape into a temperature-controlled experimental chamber respectively, and test the change of the adhesion of the tape in a low temperature (-20°C) and high temperature (60°C) environment.

[0112] Results:

[0113] By adding a thermosensitive agent (such as a reversible thermosetting resin), Examples 1-6 can maintain stable adhesion in high and low temperature environments, and their adhesion performance does not decrease significantly.

[0114] The adhesion of the existing tape decreases significantly under extreme temperature conditions and shows poor performance.

[0115] The experimental results are shown in Table 1 below

[0116] Table 1 Performance index table

[0117]

[0118] The pressure-sensitive tapes of Examples 1-6 perform significantly better than the existing pressure-sensitive tapes in terms of adhesion, weather resistance, environmental protection, and temperature stability. Especially in terms of adhesion on low surface energy materials and uneven surfaces, weather resistance during long-term use, and performance stability at extreme temperatures, there are significant improvements.

[0119] The above embodiments of the present invention do not limit the protection scope of the present invention. The implementation manners of the present invention are not limited thereto. All such modifications, substitutions or changes in various other forms made to the above structure of the present invention according to the above content of the present invention, in accordance with the common general technical knowledge and customary means in the art, without departing from the above basic technical idea of the present invention, shall fall within the protection scope of the present invention.

Claims

1. A pressure-sensitive adhesive tape, characterized in that: It comprises a base layer, a pressure-sensitive adhesive layer and a protective film layer; the pressure-sensitive adhesive layer comprises the following ingredients: acrylic copolymer, natural rubber, plasticizer, epoxy resin, alcohol solvent, antioxidant, water-soluble additive, heat sensitizer and ultraviolet stabilizer.

2. The pressure-sensitive adhesive tape according to claim 1, characterized in that: The pressure-sensitive adhesive layer comprises the following ingredients in parts by weight: 30-60 parts of acrylate copolymer, 10-30 parts of natural rubber, 5-15 parts of plasticizer, 1-5 parts of epoxy resin, 5-15 parts of alcohol solvent, 0.1-1 parts of antioxidant, 0.5-3% of water-soluble additive, 0.5-2 parts of thermosensitizer and 0.1-2 parts of ultraviolet stabilizer.

3. The pressure-sensitive adhesive tape according to claim 1 or 2, characterized in that: The base layer is made of polyester film, and the thickness of the base layer is 5 micrometers to 150 micrometers.

4. The pressure-sensitive adhesive tape according to claim 3, characterized in that: The protective film layer is made of polyethylene, and the thickness of the protective film layer is 10 microns to 50 microns.

5. The pressure-sensitive adhesive tape according to claim 1, characterized in that: The alcohol solvent is ethanol, isopropanol or a combination thereof.

6. The pressure-sensitive adhesive tape according to claim 5, characterized in that: The antioxidant is a controlled release antioxidant.

7. The pressure-sensitive adhesive tape according to claim 6, characterized in that: The water-soluble additive is polyvinyl alcohol, hydroxypropyl methylcellulose or a combination thereof.

8. The pressure-sensitive adhesive tape according to claim 7, characterized in that: The thermosensitive agent is a reversible thermosetting resin.

9. The pressure-sensitive adhesive tape according to claim 8, characterized in that: The ultraviolet stabilizer is a benzophenone ultraviolet absorber.

10. A method for preparing a pressure-sensitive adhesive tape, characterized in that: The following steps are involved: 30-60 parts of acrylic copolymer, 10-30 parts of natural rubber, 5-15 parts of plasticizer, 1-5 parts of epoxy resin, 5-15 parts of alcohol solvent, 0.1-1 parts of antioxidant, 0.5-3 parts of water-soluble additive, 0.5-2 parts of heat sensitive agent and 0.1-2 parts of ultraviolet stabilizer are mixed in proportion by weight, heated to 60-80° C., and dissolved or dispersed under stirring to obtain a uniform pressure-sensitive adhesive solution or paste; The obtained pressure-sensitive adhesive solution is evenly coated on the surface of the pretreated substrate layer, and the coating amount is controlled at 50-150 g / m2 to form a pressure-sensitive adhesive layer; The base layer coated with the pressure-sensitive adhesive layer is sent to a drying device, the temperature is set to 80-120°C, the drying time is 5-10 minutes, the solvent is removed, the pressure-sensitive adhesive layer is solidified and the required adhesion strength is achieved; The polyethylene material is made into a film, and a protective film layer is formed by heat pressing or coating process, the thickness of the protective film layer is 10 microns to 50 microns, and then the protective film layer is covered on the cured pressure-sensitive adhesive layer; The composite material is cut into required width and length to finally obtain a pressure-sensitive adhesive tape product. The size after cutting is controlled within a width range of 10 mm to 1000 mm, and the product is wound and packaged.

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