PE foam double-sided adhesive tape and preparation process thereof

Abstract

The invention belongs to the technical field of foam adhesive tapes, and provides a PE foam double-sided adhesive tape and a preparation process thereof, the PE foam double-sided adhesive tape sequentially comprises a pressure-sensitive adhesive layer, a PE foam layer, a pressure-sensitive adhesive layer and a release layer from top to bottom; the pressure-sensitive adhesive is prepared from the following raw materials in parts by weight: 20 to 25 parts of butyl acrylate, 20 to 25 parts of 2-ethylhexyl acrylate, 6 to 9 parts of methyl methacrylate, 8 to 16 parts of hydroxyethyl acrylate, 3 to 5 parts of 3-methacryloxypropyltrimethoxysilane, 1 to 4 parts of an emulsifier, 0.3 to 0.8 part of an initiator and 3 to 6 parts of modified magnesium hydroxide. According to the PE foam double-sided adhesive tape provided by the invention, the structure and the thickness of each layer are effectively regulated and controlled, so that the manufactured PE foam double-sided adhesive tape is not easy to deform, has a good shockproof buffering effect, and is excellent in adhesive force and high-temperature retentivity at the same time.

Description

Technical Field

[0001] The invention belongs to the technical field of foam tapes, and in particular relates to a PE foam double-sided tape and a preparation process thereof. Background Art

[0002] With the development of science and technology, the screens of smart electronic products are not only getting bigger, but also undergoing great changes in design and structure. As an important component for the interaction between people and electronic products, how to fix and bond the screen beautifully, safely and reliably and achieve its function is an important issue that electronic product designers, manufacturers and material suppliers need to solve. Foam tape has the advantages of very long-lasting adhesion, strong waterproofness and high temperature resistance, and is currently widely used in different mechanical parts, mobile phone accessories, electronic computer products and home appliances.

[0003] Foam double-sided tape is a double-sided tape with foam as the base material and the same or different types of pressure-sensitive adhesives coated on both sides. It has the characteristics of excellent sealing performance, good filling performance, good buffering performance, strong bonding and good stickiness. Foam tape is a common high-performance PE foam double-sided tape at this stage. It refers to a double-sided tape made by applying glue on both sides of the PE foamed base material. It has the characteristics of strong adhesion, good retention, UV protection and good weather resistance. It is widely used for fixing automotive trims, corrugated boards, wheel arcs, baffles, brake lights, car logos, electrical nameplates, etc. However, the existing PE foam double-sided tape still has more or less deficiencies in bonding performance, environmental resistance, buffering performance, shear resistance, shading performance, easy removal and rework performance, waterproof performance and high temperature resistance. In performance testing, problems such as foam cohesive failure, adhesive layer cohesive failure and poor high temperature resistance often occur, which is not suitable for use in some precision electronics industries and other fields.

[0004] Therefore, how to prepare a PE foam double-sided tape with better adhesion, initial adhesion and high-temperature retention, and better aging resistance and waterproof performance is a technical problem that urgently needs to be solved. Summary of the invention

[0005] The object of the present invention is to provide a PE foam double-sided tape and a preparation process thereof, so as to solve one of the technical problems mentioned in the background technology.

[0006] The purpose of the present invention can be achieved through the following technical solutions:

[0007] The first aspect of the present invention provides a PE foam double-sided tape, which comprises, from top to bottom, a pressure-sensitive adhesive layer, a PE foam layer, a pressure-sensitive adhesive layer and a release layer; the pressure-sensitive adhesive comprises the following raw materials in parts by weight:

[0008] 20-25 parts of butyl acrylate, 20-25 parts of isooctyl acrylate, 6-9 parts of methyl methacrylate, 8-16 parts of hydroxyethyl acrylate, 3-5 parts of 3-methacryloxypropyltrimethoxysilane, 1-4 parts of emulsifier, 0.3-0.8 parts of initiator, and 3-6 parts of modified magnesium hydroxide.

[0009] As a further embodiment of the present invention, the preparation steps of the modified magnesium hydroxide are as follows:

[0010] Magnesium hydroxide is added to Tris-HCl buffer, ultrasonically dispersed, modified dopamine is added, stirred for 24-26 hours, centrifuged and washed, the precipitate is collected, and the modified magnesium hydroxide is obtained after vacuum drying. Magnesium hydroxide has a unique layered structure, has the characteristics of high metal dispersibility, high specific surface area and thermal stability, and can be introduced into the adhesive as a filler to effectively improve the mechanical properties and thermal stability of the adhesive. However, the dispersion performance of magnesium hydroxide in the raw material is poor, and agglomeration is easily generated; therefore, in the above technical scheme, modified dopamine is used to intercalate and surface-coat magnesium hydroxide, which expands the interlayer distance of magnesium hydroxide and improves the dispersion performance and compatibility of magnesium hydroxide. At the same time, magnesium hydroxide is also endowed with certain antibacterial properties.

[0011] As a further embodiment of the present invention, the usage ratio of magnesium hydroxide, Tris-HCl buffer and modified dopamine is 5.0-5.5 g:100 mL:0.40-0.50 g.

[0012] As a further embodiment of the present invention, the modified dopamine is prepared in the following steps:

[0013] Add dopamine hydrochloride to 1,4-dioxane, stir until uniformly dispersed, add dodecyl isocyanate, continue stirring for 5-8 minutes, add dibutyltin dilaurate, stir and react at room temperature for 8-10 hours, and after the reaction, perform rotary evaporation, suction filtration, washing, extraction, and drying to obtain modified dopamine. In the above technical scheme, dopamine and dodecyl isocyanate are used to undergo an esterification reaction to prepare modified dopamine. At this time, the modified dopamine contains a longer carbon chain and a branched structure with a larger spatial volume, so it can effectively prevent the formation of bubbles and liquid films and has excellent defoaming properties.

[0014] As a further embodiment of the present invention, the usage ratio of dopamine hydrochloride, 1,4-dioxane, dodecyl isocyanate and dibutyltin dilaurate is 1.1-1.2 g: 30 mL: 0.30-0.35 g: 0.005-0.006 g.

[0015] As a further embodiment of the present invention, the preparation steps of the pressure-sensitive adhesive are as follows:

[0016] S1. Weigh butyl acrylate, isooctyl acrylate, methyl methacrylate, hydroxyethyl acrylate and 3-methacryloxypropyltrimethoxysilane in parts by weight and mix them evenly to obtain a premix;

[0017] S2. Add emulsifier, initiator and modified magnesium hydroxide to the premix, raise the temperature to 75-85° C., stir and react for 3-5 hours, cool to room temperature, place in a vacuum evaporator, and vacuum dry at 40-50° C. for 1.5-2 hours to obtain a pressure-sensitive adhesive.

[0018] As a further embodiment of the present invention, the emulsifier is at least one of sodium dodecyl sulfate and sodium dodecylbenzene sulfonate.

[0019] As a further embodiment of the present invention, the initiator is at least one of benzoyl oxide, lauroyl peroxide, tert-butyl hydroperoxide, azobisisobutyronitrile and azobisisoheptanenitrile.

[0020] As a further embodiment of the present invention, the thickness of the pressure-sensitive adhesive layer is 20-80 μm, the thickness of the PE foam layer is 50-500 μm, and the thickness of the release layer is 50-80 μm.

[0021] The second aspect of the present invention provides a preparation process of a PE foam double-sided tape, comprising the following steps:

[0022] Step 1, performing double-sided corona pretreatment on the PE foam;

[0023] Step 2: Apply pressure-sensitive adhesive on the release film and adhere it to the lower layer of PE foam;

[0024] Step 3: Apply a pressure-sensitive adhesive on the release film to adhere it to the upper layer of the PE foam, and peel off the release film at the same time, reel it up and mature it to obtain a PE foam double-sided tape.

[0025] Beneficial effects of the present invention:

[0026] (1) The pressure-sensitive adhesive used in the present invention is prepared by mixing butyl acrylate, isooctyl acrylate, methyl methacrylate, hydroxyethyl acrylate, 3-methacryloxypropyltrimethoxysilane, an emulsifier, an initiator and modified magnesium hydroxide. The Si-O bond energy in 3-methacryloxypropyltrimethoxysilane is large, the molecular chain is flexible, and it has excellent high and low temperature resistance and weather resistance. Introducing it into acrylic resin can improve the high and low temperature resistance, ultraviolet light resistance and water resistance of acrylic resin, thereby effectively improving the water resistance of the pressure-sensitive adhesive, reducing its water absorption rate, and improving the bonding performance of the pressure-sensitive adhesive. The introduction of modified magnesium hydroxide in the raw materials, on the one hand, enhances the mechanical properties and thermal stability of the pressure-sensitive adhesive, and on the other hand, improves the flame retardant and antibacterial properties of the pressure-sensitive adhesive, thereby greatly extending the service life of the adhesive. In addition, it also has an excellent defoaming effect, which makes the obtained pressure-sensitive adhesive layer surface flat and smooth, with strong coating performance, excellent viscosity and durability. At the same time, the pressure-sensitive adhesive has a low preparation cost, which is conducive to large-scale industrial production and application.

[0027] (2) The PE foam double-sided tape provided by the present invention is not easy to deform by effectively controlling its structure and the thickness of each layer, and has good shock-proof and buffering effects, while having excellent adhesion and high-temperature retention.

[0028] (3) The preparation process of the PE foam double-sided tape provided by the present invention is simple, easy to operate, and suitable for large-scale production and application. DETAILED DESCRIPTION

[0029] The following will be combined with the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0030] Example 1

[0031] This embodiment provides a modified magnesium hydroxide, and the preparation steps are as follows:

[0032] 1.1 g of dopamine hydrochloride was added to 30 mL of 1,4-dioxane, and stirred until uniformly dispersed. 0.30 g of dodecyl isocyanate was added, and stirring was continued for 5 min. 0.005 g of dibutyltin dilaurate was added, and the mixture was stirred and reacted at room temperature for 8 h. After the reaction was completed, rotary evaporation was performed, and the obtained crude product was filtered and washed with hot deionized water at 60° C. for 3 times. Finally, the obtained product was extracted with ethyl acetate and dried to obtain modified dopamine.

[0033] 5.0 g of magnesium hydroxide was added to 100 mL of Tris-HCl buffer (10 mmol / L, pH = 8.5), ultrasonically treated for 30 min, 0.40 g of modified dopamine was added, and stirred for 24 h. The solid precipitate after centrifugation was washed three times with a 25% isopropanol aqueous solution, the solid precipitate was collected, and dried in a vacuum drying oven at 60 ° C for 24 h to obtain modified magnesium hydroxide.

[0034] Example 2

[0035] Compared with Example 1, the only difference is:

[0036] Add 1.2 g of dopamine hydrochloride to 30 mL of 1,4-dioxane, stir until uniformly dispersed, add 0.35 g of dodecyl isocyanate, continue stirring for 5 min, add 0.006 g of dibutyltin dilaurate, stir and react at room temperature for 8 h, and perform rotary evaporation after the reaction. Filter and wash the crude product with hot deionized water at 60 ° C for 3 times, and finally extract the product with ethyl acetate and dry to obtain modified dopamine.

[0037] Example 3

[0038] Compared with Example 1, the only difference is:

[0039] 5.5 g of magnesium hydroxide was added to 100 mL of Tris-HCl buffer (10 mmol / L, pH = 8.5), and ultrasonic treatment was performed for 30 min. 0.50 g of modified dopamine was added and stirred for 24 h. The solid precipitate after centrifugation was washed three times with a 25% isopropanol aqueous solution. The solid precipitate was collected and dried in a vacuum drying oven at 60 ° C for 24 h to obtain modified magnesium hydroxide.

[0040] Comparative Example 1

[0041] Compared with Example 1, the only difference is:

[0042] 5.0 g of magnesium hydroxide was added to 100 mL of Tris-HCl buffer (10 mmol / L, pH = 8.5), ultrasonically treated for 30 min, 0.40 g of dopamine was added, and stirred for 24 h. The solid precipitate after centrifugation was washed three times with a 25% isopropanol aqueous solution, and the solid precipitate was collected and dried in a vacuum drying oven at 60 ° C for 24 h to obtain modified magnesium hydroxide.

[0043] Comparative Example 2

[0044] Compared with Example 1, the only difference is:

[0045] 5.0 g of magnesium hydroxide was added to 100 mL of deionized water and stirred for 24 h. The solid precipitate after centrifugation was washed three times with deionized water. The solid precipitate was collected and dried in a vacuum drying oven at 60° C. for 24 h to obtain modified magnesium hydroxide.

[0046] Example 4

[0047] The present embodiment provides a PE foam double-sided tape, which comprises, from top to bottom, a pressure-sensitive adhesive layer (thickness of 20 μm), a PE foam layer (thickness of 50 μm), a pressure-sensitive adhesive layer (thickness of 20 μm) and a release layer (thickness of 50 μm); the pressure-sensitive adhesive comprises the following raw materials in parts by weight:

[0048] 22 parts of butyl acrylate, 25 parts of isooctyl acrylate, 7 parts of methyl methacrylate, 12 parts of hydroxyethyl acrylate, 5 parts of 3-methacryloxypropyltrimethoxysilane, 1 part of sodium dodecyl sulfate, 0.5 parts of benzoyl oxide, and 4 parts of modified magnesium hydroxide in Example 1.

[0049] The preparation steps of the pressure-sensitive adhesive are as follows:

[0050] S1. Weigh butyl acrylate, isooctyl acrylate, methyl methacrylate, hydroxyethyl acrylate and 3-methacryloxypropyltrimethoxysilane in parts by weight and mix them evenly to obtain a premix;

[0051] S2. Add sodium dodecyl sulfate, benzoyl oxide and the modified magnesium hydroxide in Example 1 to the premix, raise the temperature to 75° C., stir and react for 3 hours, cool to room temperature, place in a vacuum evaporator, and vacuum dry at 40° C. for 2 hours to obtain a pressure-sensitive adhesive.

[0052] Among them, the preparation process of PE foam double-sided tape is as follows:

[0053] Step 1, performing double-sided corona pretreatment on the PE foam;

[0054] Step 2: Apply pressure-sensitive adhesive on the release film and adhere it to the lower layer of PE foam;

[0055] Step 3: Apply a pressure-sensitive adhesive on the release film to adhere it to the upper layer of the PE foam, and peel off the release film at the same time, reel it up and mature it to obtain a PE foam double-sided tape.

[0056] Example 5

[0057] Compared with Example 4, the only difference is:

[0058] The modified magnesium hydroxide in Example 1 is replaced by the modified magnesium hydroxide in Example 2, and the amount used remains unchanged.

[0059] Example 6

[0060] Compared with Example 4, the only difference is:

[0061] The modified magnesium hydroxide in Example 1 is replaced by the modified magnesium hydroxide in Example 3, and the amount used remains unchanged.

[0062] Example 7

[0063] Compared with Example 4, the only difference is:

[0064] The pressure-sensitive adhesive comprises the following raw materials in parts by weight:

[0065] 25 parts of butyl acrylate, 23 parts of isooctyl acrylate, 9 parts of methyl methacrylate, 15 parts of hydroxyethyl acrylate, 5 parts of 3-methacryloxypropyltrimethoxysilane, 4 parts of sodium dodecyl sulfate, 0.7 parts of benzoyl oxide, and 5.5 parts of modified magnesium hydroxide in Example 1.

[0066] Comparative Example 3

[0067] The pressure-sensitive adhesive raw material used in this comparative example does not contain modified magnesium hydroxide:

[0068] A PE foam double-sided tape comprises, from top to bottom, a pressure-sensitive adhesive layer (thickness of 20 μm), a PE foam layer (thickness of 50 μm), a pressure-sensitive adhesive layer (thickness of 20 μm) and a release layer (thickness of 50 μm); the pressure-sensitive adhesive comprises the following raw materials in parts by weight:

[0069] 22 parts of butyl acrylate, 25 parts of isooctyl acrylate, 7 parts of methyl methacrylate, 12 parts of hydroxyethyl acrylate, 5 parts of 3-methacryloxypropyltrimethoxysilane, 1 part of sodium dodecyl sulfate, and 0.5 parts of benzoyl oxide.

[0070] The preparation steps of the pressure-sensitive adhesive are as follows:

[0071] S1. Weigh butyl acrylate, isooctyl acrylate, methyl methacrylate, hydroxyethyl acrylate and 3-methacryloxypropyltrimethoxysilane in parts by weight and mix them evenly to obtain a premix;

[0072] S2. Add sodium dodecyl sulfate and benzoyl oxide to the premix, raise the temperature to 75°C, stir and react for 3 hours, cool to room temperature, place in a vacuum evaporator, and vacuum dry at 40°C for 2 hours to obtain a pressure-sensitive adhesive.

[0073] Among them, the preparation process of PE foam double-sided tape is as follows:

[0074] Step 1, performing double-sided corona pretreatment on the PE foam;

[0075] Step 2: Apply pressure-sensitive adhesive on the release film and adhere it to the lower layer of PE foam;

[0076] Step 3: Apply a pressure-sensitive adhesive on the release film to adhere it to the upper layer of the PE foam, and peel off the release film at the same time, reel it up and mature it to obtain a PE foam double-sided tape.

[0077] Comparative Example 4

[0078] Compared with Example 4, the only difference is:

[0079] The modified magnesium hydroxide in Example 1 was replaced by the modified magnesium hydroxide in Comparative Example 1, and the amount used remained unchanged.

[0080] Comparative Example 5

[0081] Compared with Example 4, the only difference is:

[0082] The modified magnesium hydroxide in Example 1 was replaced by the modified magnesium hydroxide in Comparative Example 2, and the amount used remained unchanged.

[0083] Comparative Example 6

[0084] Compared with Example 4, the only difference is:

[0085] The pressure-sensitive adhesive comprises the following raw materials in parts by weight:

[0086] 17 parts of butyl acrylate, 30 parts of isooctyl acrylate, 7 parts of methyl methacrylate, 12 parts of hydroxyethyl acrylate, 5 parts of 3-methacryloxypropyltrimethoxysilane, 1 part of sodium dodecyl sulfate, 0.5 parts of benzoyl oxide, and 4 parts of modified magnesium hydroxide in Example 1.

[0087] 1. The following performance tests were conducted on the pressure-sensitive adhesives obtained in Examples 4 to 7 and Comparative Examples 3 to 6: The pressure-sensitive adhesives prepared in the Examples and Comparative Examples were heated to 5 g / cm 2 The amount of the adhesive was coated on a 10×10 PE substrate (thickness of 100 μm), and the coating effect was observed after standing for 10 minutes. It was then dried at 60°C, and the dry adhesive thickness was 50 μm.

[0088] (1) According to GB / T 7124-2008 standard, the tensile shear strength was measured using a universal testing machine (tensile rate was 10 mm / min);

[0089] (2) Test the peel strength according to GB / T 2790-1995;

[0090] (3) Test its flame retardancy rating according to UL-94;

[0091] (4) Using Escherichia coli as the experimental bacteria, the antibacterial rate of the obtained pressure-sensitive adhesive was tested.

[0092] The above test results are shown in Table 1:

[0093] Table 1

[0094]

[0095]

[0096] As can be seen from Table 1, in Comparative Example 3, the pressure-sensitive adhesive is modified magnesium hydroxide, in Comparative Example 4, the modified magnesium hydroxide in Comparative Example 1 (modified only with dopamine) is added, in Comparative Example 5, the modified magnesium hydroxide in Comparative Example 2 (unmodified) is added, and the amount of the raw material dosage in the pressure-sensitive adhesive in Comparative Example 6 exceeds the range provided in the present invention. It can be seen from the data in the table that the mechanical properties, flame retardant properties, antibacterial properties and defoaming effects of the pressure-sensitive adhesives obtained in Comparative Examples 3-6 are all poorer than those in Examples 4-7. It can be seen that the modified magnesium hydroxide provided in the present invention can effectively improve the mechanical properties and thermal stability of the adhesive, and impart antibacterial properties and defoaming properties to the adhesive, thereby extending the service life of the adhesive.

[0097] 2. The following performance tests were performed on the PE foam double-sided tapes obtained in Examples 4 to 7 and Comparative Examples 3 to 6:

[0098] (1) Conduct tensile properties test according to GB / T 7753-1987;

[0099] (2) Peel strength test according to GB / T 2792-2014;

[0100] (3) Impact resistance test according to standard NF X41-033-1996;

[0101] (4) Adhesion test according to GB / T 2792-2014;

[0102] (5) The holding force test is carried out according to the standard GB / T 4851-2014.

[0103] The above test results are shown in Table 2:

[0104] Table 2

[0105]

[0106]

[0107] It can be seen from Table 2 that the PE foam double-sided tape obtained in Examples 4-7 has excellent mechanical properties and adhesion compared to Comparative Examples 3-6. It can be seen that the PE foam double-sided tape provided in the present invention has good shockproof and buffering effects, and at the same time has excellent adhesion and high temperature retention, and the preparation process is simple, easy to operate, and suitable for large-scale production and application.

[0108] It should be noted that, in this article, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprises" or any other variations thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device.

[0109] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A PE foam double-sided tape, characterized in that: The adhesive comprises a pressure-sensitive adhesive layer, a PE foam layer, a pressure-sensitive adhesive layer and a release layer in order from top to bottom; the pressure-sensitive adhesive comprises the following raw materials in parts by weight: 20-25 parts of butyl acrylate, 20-25 parts of isooctyl acrylate, 6-9 parts of methyl methacrylate, 8-16 parts of hydroxyethyl acrylate, 3-5 parts of 3-methacryloxypropyltrimethoxysilane, 1-4 parts of emulsifier, 0.3-0.8 parts of initiator, and 3-6 parts of modified magnesium hydroxide.

2. A PE foam double-sided tape according to claim 1, characterized in that: The preparation steps of the modified magnesium hydroxide are as follows: The magnesium hydroxide is added into Tris-HCl buffer, dispersed by ultrasonication, the modified dopamine is added, stirred for 24-26 hours, washed by centrifugation, the precipitate is collected, and vacuum dried to obtain the modified magnesium hydroxide.

3. A PE foam double-sided tape according to claim 2, characterized in that: The usage ratio of magnesium hydroxide, Tris-HCl buffer and modified dopamine is 5.0-5.5 g:100 mL:0.40-0.50 g.

4. A PE foam double-sided tape according to claim 2, characterized in that: The modified dopamine preparation steps are as follows: Add dopamine hydrochloride to 1,4-dioxane, stir until evenly dispersed, add dodecyl isocyanate, continue stirring for 5-8 minutes, add dibutyltin dilaurate, stir and react at room temperature for 8-10 hours, after the reaction is completed, perform rotary evaporation, filter and wash, extract, and dry to obtain modified dopamine.

5. A PE foam double-sided tape according to claim 4, characterized in that: The dosage ratio of dopamine hydrochloride, 1,4-dioxane, dodecyl isocyanate and dibutyltin dilaurate is 1.1-1.2 g: 30 mL: 0.30-0.35 g: 0.005-0.006 g.

6. A PE foam double-sided tape according to claim 1, characterized in that: The preparation steps of the pressure-sensitive adhesive are as follows: S1. Weigh butyl acrylate, isooctyl acrylate, methyl methacrylate, hydroxyethyl acrylate and 3-methacryloxypropyltrimethoxysilane in parts by weight and mix them evenly to obtain a premix; S2. Add emulsifier, initiator and modified magnesium hydroxide to the premix, raise the temperature to 75-85° C., stir and react for 3-5 hours, cool to room temperature, place in a vacuum evaporator, and vacuum dry at 40-50° C. for 1.5-2 hours to obtain a pressure-sensitive adhesive.

7. A PE foam double-sided tape according to claim 1, characterized in that: The emulsifier is at least one of sodium dodecyl sulfate and sodium dodecylbenzene sulfonate.

8. The PE foam double-sided tape according to claim 1, characterized in that: The initiator is at least one of benzoyl oxide, lauroyl peroxide, tert-butyl hydroperoxide, azobisisobutyronitrile and azobisisoheptanenitrile.

9. A PE foam double-sided tape according to claim 1, characterized in that: The thickness of the pressure-sensitive adhesive layer is 20-80 μm, the thickness of the PE foam layer is 50-500 μm, and the thickness of the release layer is 50-80 μm.

10. A process for preparing a PE foam double-sided tape according to any one of claims 1 to 9, characterized in that: The following steps are involved: Step 1, performing double-sided corona pretreatment on the PE foam; Step 2: Apply pressure-sensitive adhesive on the release film and adhere it to the lower layer of PE foam; Step 3: Apply a pressure-sensitive adhesive on the release film to adhere it to the upper layer of the PE foam, and peel off the release film at the same time, reel it up and mature it to obtain a PE foam double-sided tape.

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