Double-sided adhesive tape

Abstract

The utility model provides a double-sided adhesive tape. The double-sided adhesive tape comprises an antistatic acrylate adhesive layer, an antistatic TPU (thermoplastic polyurethane) layer and an antistatic thermal visbreaking type acrylate adhesive layer which are sequentially stacked, wherein the anti-static heat visbreaking type acrylate adhesive layer is attached to the screen of the electronic product, and the stripping force of the anti-static heat visbreaking type acrylate adhesive layer can be rapidly reduced after heating, so that the screen of the electronic product can be easily taken down, and the phenomenon that an attached object is damaged due to the fact that the screen is torn off vigorously is avoided; after the antistatic acrylate adhesive layer is heated, the stripping force is still high, so that the double-sided adhesive tape can be continuously left on an electronic product, and subsequent bonding is facilitated; in addition, the anti-static TPU layer can improve the attaching fitness and shock resistance of the double-sided tape, ensures stable connection of internal parts of an electronic product, and prevents the internal parts from being damaged due to vibration or collision in the using process.

Description

TECHNICAL FIELD

[0001] The utility model belongs to double -sided tape technical field, concretely relates to a double -sided tape. BACKGROUND

[0002] With the aggravation of the thinning trend of smart phones, the use of high-performance film tape is increasing, and such tape has sufficient adhesion, durability and weather resistance to ensure the stable connection of internal components of the phone and meet the design requirements of the increasingly thin and precise phone.

[0003] CN117586704A discloses a double-sided tape, which comprises a first adhesive layer, a PI substrate layer and a second adhesive layer stacked in sequence, and the first adhesive layer and the second adhesive layer are both made of water-based hot melt adhesive; CN218811502U discloses a nano-gold composite ultra-thin double-sided tape, which comprises a double-sided tape body, a composite substrate layer and a second release paper outer layer, a first release paper outer layer is attached to one side of the double-sided tape body, and the second release paper outer layer is attached to the other side of the double-sided tape body; CN105874024A discloses a double-sided tape, which comprises a substrate layer, an adhesive layer stacked on both sides of the substrate layer, and a release liner stacked on the adhesive layer.

[0004] However, the existing film tape usually uses polyester film as the substrate, and the electronic products such as mobile phones are easily damaged due to vibration or impact during use, and the shock buffering effect needs to be further improved; moreover, the processing of traditional tape has limitations, and it has a certain amount of static electricity to varying degrees, which easily adsorbs dust or other particles during use, affecting the service life of electronic components; in addition, once the rework or repair is involved, due to the high adhesion of the traditional tape, the front screen, the middle frame and the back cover of the mobile phone are easily damaged. In view of this, in order to prolong the service life of electronic products, eliminate the influence of static electricity on electronic components, and complete the disassembly of the front screen without damaging the mobile phone parts and leaving the tape on the middle frame of the mobile phone, it is necessary to improve the existing film tape. UTILITY MODEL CONTENTS

[0005] In view of the problems in the prior art, the utility model aims to provide a double-sided tape, which has excellent shock buffering performance and anti-static property through the design of its structure, and is convenient for rework or repair of electronic products such as mobile phones.

[0006] To achieve this purpose, the utility model adopts the following technical solutions:

[0007] The utility model provides a double-sided tape, which comprises an anti-static acrylic adhesive layer, an anti-static TPU layer and an anti-static heat-reduced tack acrylic adhesive layer which are stacked in sequence.

[0008] The double-sided adhesive tape provided by the utility model has the characteristics that the peeling force of the antistatic heat-reduced adhesion type acrylic adhesive layer is rapidly reduced after heating, and the peeling force of the antistatic acrylic adhesive layer is still relatively high after heating, when the double-sided adhesive tape is used, the antistatic heat-reduced adhesion type acrylic adhesive layer is attached to the screen of the electronic product such as a mobile phone, the antistatic acrylic adhesive layer is attached to the middle frame of the mobile phone, when the mobile phone is reworked or repaired, the adhesive force of the antistatic heat-reduced adhesion type acrylic adhesive layer of the double-sided adhesive tape is rapidly reduced through the heating mode, so that the mobile phone screen can be easily removed, damage to the attached object is avoided when the mobile phone screen is removed with great force, and meanwhile, the peeling force of the antistatic acrylic adhesive layer is still relatively high after heating, so that the double-sided adhesive tape can continue to be attached to the middle frame of the mobile phone, and the subsequent attachment is facilitated.

[0009] The double-sided adhesive tape provided by the utility model has the characteristics that the peeling force of the antistatic heat-reduced adhesion type acrylic adhesive layer is rapidly reduced after heating, and the peeling force of the antistatic acrylic adhesive layer is still relatively high after heating, when the double-sided adhesive tape is used, the antistatic heat-reduced adhesion type acrylic adhesive layer is attached to the screen of the electronic product such as a mobile phone, the antistatic acrylic adhesive layer is attached to the middle frame of the mobile phone, when the mobile phone is reworked or repaired, the adhesive force of the antistatic heat-reduced adhesion type acrylic adhesive layer of the double-sided adhesive tape is rapidly reduced through the heating mode, so that the mobile phone screen can be easily removed, damage to the attached object is avoided when the mobile phone screen is removed with great force, and simultaneously, the peeling force of the antistatic acrylic adhesive layer is still relatively high after heating, so that the double-sided adhesive tape can continue to be attached to the middle frame of the mobile phone, and the subsequent attachment is facilitated.

[0010] The following is a preferred technical scheme of the utility model, but not as a limitation on the technical scheme provided by the utility model, through the following preferred technical scheme, the purpose and beneficial effect of the utility model can be better achieved and realized.

[0011] As a preferred technical scheme, the thickness of the antistatic acrylic adhesive layer is 10-40 μm, for example, it can be 10 μm, 12 μm, 14 μm, 16 μm, 18 μm, 20 μm, 22 μm, 24 μm, 26 μm, 28 μm, 30 μm, 32 μm, 34 μm, 36 μm or 38 μm, etc.

[0012] Preferably, the peeling force of the antistatic acrylic adhesive layer is 1000-2500 gf / inch, for example, it can be 1200 gf / inch, 1400 gf / inch, 1600 gf / inch, 1800 gf / inch, 2000 gf / inch, 2200 gf / inch, 2400 gf / inch, etc.

[0013] The anti-static acrylic adhesive layer contains an antistatic agent, thereby having anti-static performance; the material of the anti-static acrylic adhesive layer is a material known in the prior art, for example, can be the glue disclosed in CN113604169A.

[0014] Illustratively, the preparation raw materials of the anti-static acrylic adhesive layer include 70-90 parts by weight of strong adhesion type acrylic adhesive, 1-4 parts by weight of first crosslinking agent, 10-20 parts by weight of first tackifying resin and 1-5 parts by weight of first additive antistatic agent.

[0015] The strong adhesion type acrylic adhesive is 70-90 parts by weight, for example, can be 72 parts by weight, 74 parts by weight, 76 parts by weight, 78 parts by weight, 80 parts by weight, 82 parts by weight, 84 parts by weight, 86 parts by weight, 88 parts by weight, etc.

[0016] The first crosslinking agent is 1-4 parts by weight, for example, can be 1.2 parts by weight, 1.5 parts by weight, 1.8 parts by weight, 2 parts by weight, 2.2 parts by weight, 2.5 parts by weight, 2.8 parts by weight, 3 parts by weight, 3.2 parts by weight, 3.5 parts by weight, 3.8 parts by weight, etc.

[0017] The first tackifying resin is 10-20 parts by weight, for example, can be 11 parts by weight, 12 parts by weight, 13 parts by weight, 14 parts by weight, 15 parts by weight, 16 parts by weight, 17 parts by weight, 18 parts by weight, 19 parts by weight, etc.

[0018] The first additive antistatic agent is 1-5 parts by weight, for example, can be 1.2 parts by weight, 1.5 parts by weight, 1.8 parts by weight, 2 parts by weight, 2.2 parts by weight, 2.5 parts by weight, 2.8 parts by weight, 3 parts by weight, 3.2 parts by weight, 3.5 parts by weight, 3.8 parts by weight, 4 parts by weight, 4.5 parts by weight, etc.

[0019] Preferably, the preparation raw materials of the strong adhesion type acrylic adhesive include a combination of hard monomers, soft monomers and functional monomers.

[0020] Preferably, the hard monomers include any one or a combination of at least two of acrylonitrile, acrylamide, styrene, methyl methacrylate or methyl acrylate.

[0021] Preferably, the soft monomers include any one or a combination of at least two of ethyl acrylate, n-butyl acrylate or 2-ethylhexyl acrylate.

[0022] Preferably, the functional monomers include any one or a combination of at least two of methacrylic acid, acrylic acid, hydroxyethyl acrylate, hydroxypropyl acrylate, hydroxyethyl methacrylate or hydroxypropyl methacrylate.

[0023] Preferably, the first tackifying resin comprises any one or a combination of rosin resin, terpene phenol resin or terpene resin.

[0024] Preferably, the thickness of the antistatic TPU layer is 5-50 μm, for example, can be 6 μm, 8 μm, 10 μm, 12 μm, 15 μm, 18 μm, 20 μm, 22 μm, 25 μm, 28 μm, 30 μm, 32 μm, 35 μm, 38 μm, 40 μm, 42 μm, 45 μm, 48 μm, etc.

[0025] In the utility model, the antistatic TPU layer contains antistatic agent, thereby having antistatic performance;The material of the antistatic TPU layer is the material known in the prior art, for example, can be the material disclosed in CN101743262A.

[0026] Exemplarily, the preparation raw material of the antistatic TPU layer comprises 3-7 parts by weight of first antistatic agent, 5-25 parts by weight of TPU and 70-90 parts by weight of solvent.

[0027] The first antistatic agent is 3-7 parts by weight, for example, can be 3.5 parts by weight, 4 parts by weight, 4.5 parts by weight, 5 parts by weight, 5.5 parts by weight, 6 parts by weight, 6.5 parts by weight, etc.

[0028] The TPU is 5-25 parts by weight, for example, can be 6 parts by weight, 8 parts by weight, 10 parts by weight, 12 parts by weight, 15 parts by weight, 18 parts by weight, 20 parts by weight, 22 parts by weight, etc.

[0029] The solvent is 70-90 parts by weight, for example, can be 72 parts by weight, 74 parts by weight, 76 parts by weight, 78 parts by weight, 80 parts by weight, 82 parts by weight, 84 parts by weight, 86 parts by weight, 88 parts by weight, etc.

[0030] Preferably, the TPU comprises any one or a combination of polyester type TPU, polyether type TPU or polycaprolactone type TPU.

[0031] Preferably, the first antistatic agent comprises any one or a combination of first cationic antistatic agent, anionic antistatic agent, zwitterionic antistatic agent, first non-ionic antistatic agent or high molecular antistatic agent.

[0032] Preferably, the anionic antistatic agent comprises any one or a combination of alkyl sulfonate, sulfate or phosphoric acid derivative.

[0033] Preferably, the zwitterionic antistatic agent comprises any one or a combination of quaternary ammonium inner salt, amphoteric alkyl imidazoline salt or alkyl amino acid.

[0034] Preferably, the high molecular antistatic agent includes any one or a combination of at least two of a polyether type, a sulfonic acid group-containing high molecular antistatic agent, or an internal alkali salt high molecular antistatic agent.

[0035] Preferably, the solvent includes any one or a combination of at least two of N,N-dimethylformamide, acetone, butanone, cyclohexanone, toluene, or ethyl acetate.

[0036] Preferably, the thickness of the antistatic heat-viscosity-reducing acrylate adhesive layer is 10-40 μm, for example, can be 10 μm, 12 μm, 14 μm, 16 μm, 18 μm, 20 μm, 22 μm, 24 μm, 26 μm, 28 μm, 30 μm, 32 μm, 34 μm, 36 μm, or 38 μm, etc.

[0037] In the utility model, the antistatic heat-viscosity-reducing acrylate adhesive layer contains an antistatic agent, thereby having antistatic performance; the material of the antistatic heat-viscosity-reducing acrylate adhesive layer is a material known in the prior art, for example, can be the glue disclosed in CN112662324A.

[0038] Exemplarily, the preparation raw material of the antistatic heat-viscosity-reducing acrylate adhesive layer includes 60-80 parts by weight of a heat-viscosity-reducing acrylate adhesive, 1-3 parts by weight of a second crosslinking agent, 15-35 parts by weight of a second tackifying resin, and 1-5 parts by weight of a second additive antistatic agent.

[0039] The heat-viscosity-reducing acrylate adhesive is 60-80 parts by weight, for example, can be 62 parts by weight, 64 parts by weight, 66 parts by weight, 68 parts by weight, 70 parts by weight, 72 parts by weight, 74 parts by weight, 76 parts by weight, 78 parts by weight, etc.

[0040] The second crosslinking agent is 1-3 parts by weight, for example, can be 1.2 parts by weight, 1.5 parts by weight, 1.8 parts by weight, 2 parts by weight, 2.2 parts by weight, 2.5 parts by weight, 2.8 parts by weight, etc.

[0041] The second tackifying resin is 15-35 parts by weight, for example, can be 16 parts by weight, 18 parts by weight, 20 parts by weight, 22 parts by weight, 24 parts by weight, 26 parts by weight, 28 parts by weight, 30 parts by weight, 32 parts by weight, 34 parts by weight, etc.

[0042] The second additive antistatic agent is 1-5 parts by weight, for example, can be 1.2 parts by weight, 1.5 parts by weight, 1.8 parts by weight, 2 parts by weight, 2.2 parts by weight, 2.5 parts by weight, 2.8 parts by weight, 3 parts by weight, 3.2 parts by weight, 3.5 parts by weight, 3.8 parts by weight, 4 parts by weight, 4.5 parts by weight, etc.

[0043] Preferably, the preparation raw materials of the heat reduced adhesion type acrylic adhesive include any one or a combination of at least two of butyl acrylate, ethyl acrylate, methyl methacrylate, methyl acrylate, 2-ethylhexyl acrylate, 4-hydroxybutyl acrylate, hydroxyethyl acrylate or hydroxypropyl acrylate.

[0044] Preferably, the acid value of the heat reduced adhesion type acrylic adhesive is < 15 mgKOH / g, for example, can be 1 mgKOH / g, 2 mgKOH / g, 3 mgKOH / g, 4 mgKOH / g, 5 mgKOH / g, 6 mgKOH / g, 7 mgKOH / g, 8 mgKOH / g, 9 mgKOH / g, 10 mgKOH / g, 11 mgKOH / g, 12 mgKOH / g, 13 mgKOH / g or 14 mgKOH / g, etc.

[0045] The antistatic heat reduced adhesion type acrylic adhesive layer of the double-sided adhesive tape is bonded with the mobile phone screen, and the copper foil is usually directly contacted, so the low-acid adhesive is selected for the antistatic heat reduced adhesion type acrylic adhesive layer, so as to avoid the corrosion problem.

[0046] Preferably, the first crosslinking agent and the second crosslinking agent each independently include any one or a combination of at least two of isocyanate, epoxy resin or metal salt.

[0047] Preferably, the second tackifying resin includes any one or a combination of at least two of rosin resin, terpene phenol resin, terpene resin or petroleum resin.

[0048] Preferably, the first additive antistatic agent and the second additive antistatic agent each independently include a second cationic antistatic agent and / or a second non-ionic antistatic agent.

[0049] Preferably, the first cationic antistatic agent and the second cationic antistatic agent each independently include any one or a combination of at least two of quaternary ammonium salt, ammonium salt or alkyl imidazole.

[0050] Preferably, the first non-ionic antistatic agent and the second non-ionic antistatic agent each independently include any one or a combination of at least two of polyol, polyol ester, fatty acid alcohol or alkyl phenol ethylene oxide adduct.

[0051] Preferably, the double-sided adhesive tape further includes a first release film layer; the first release film layer is attached to the surface of the antistatic acrylic adhesive layer away from the antistatic TPU layer.

[0052] Preferably, the thickness of the first release film layer is 30-50 μm, for example, can be 32 μm, 34 μm, 36 μm, 38 μm, 40 μm, 42 μm, 44 μm, 46 μm, 48 μm, etc.

[0053] Preferably, the release force of the first release film layer is 20-40 gf / 50 mm, for example, can be 22 gf / 50 mm, 24 gf / 50 mm, 26 gf / 50 mm, 28 gf / 50 mm, 30 gf / 50 mm, 32 gf / 50 mm, 34 gf / 50 mm, 36 gf / 50 mm, 38 gf / 50 mm, etc.

[0054] Preferably, the double-sided adhesive tape further comprises a second release film layer; the second release film layer is attached to the surface of the antistatic hot-tack-reducing acrylic adhesive layer away from the antistatic TPU layer.

[0055] Preferably, the thickness of the second release film layer is 20-40 μm, for example, can be 22 μm, 24 μm, 26 μm, 28 μm, 30 μm, 32 μm, 34 μm, 36 μm, or 38 μm, etc.

[0056] Preferably, the release force of the second release film layer is 1-15 gf / 50 mm, for example, can be 2 gf / 50 mm, 3 gf / 50 mm, 4 gf / 50 mm, 5 gf / 50 mm, 6 gf / 50 mm, 7 gf / 50 mm, 8 gf / 50 mm, 9 gf / 50 mm, 10 gf / 50 mm, 11 gf / 50 mm, 12 gf / 50 mm, 13 gf / 50 mm, 14 gf / 50 mm, etc.

[0057] Preferably, the material of the first release film layer is PET; the color of the first release film layer is colorless and transparent.

[0058] Preferably, the material of the second release film layer is PET; the color of the second release film layer can be blue, green or red, etc.

[0059] The double-sided adhesive tape provided by the utility model has colorless and transparent first release film layer and colored second release film layer, which facilitates users to distinguish the antistatic acrylic adhesive layer and the antistatic hot-tack-reducing acrylic adhesive layer.

[0060] The double-sided adhesive tape provided by the utility model has a thickness of 75-220 μm, is an ultra-thin double-sided adhesive tape, and can meet the design requirements of thin mobile phones.

[0061] Exemplarily, the double-sided adhesive tape provided by the utility model is prepared by the following method, which comprises the following steps:

[0062] (1) coating the material of the antistatic TPU layer on the process release film, carrying out first drying and winding to obtain the antistatic TPU layer;

[0063] (2) coating the material of the antistatic acrylate adhesive layer on the first release film layer, carrying out second drying and then laminating with the antistatic TPU layer;

[0064] (3) coating the material of the antistatic hot debondable acrylate adhesive layer on the second release film layer, carrying out third drying and then laminating with the other side of the antistatic TPU layer, and then winding and curing to obtain the double-sided tape.

[0065] Preferably, the temperature of the first drying is 150-160 DEG C, and the time is 3-8 min.

[0066] Preferably, the temperature of the second drying is 90-120 DEG C, and the time is 2-5 min.

[0067] Preferably, the temperature of the third drying is 90-120 DEG C, and the time is 2-5 min.

[0068] Preferably, the temperature of the curing is 20-50 DEG C, and the time is 72-168 h.

[0069] Compared with the prior art, the double-sided tape has the following beneficial effects:

[0070] The double-sided tape provided by the utility model has excellent shock buffering performance and antistatic property, wherein the XY transverse impact strength is 0.72-0.97 J, the Z longitudinal impact strength is 0.45-0.71 J, the impedance of the antistatic acrylate adhesive layer is 10 7 -10 8 Ω, the impedance of the antistatic hot debondable acrylate adhesive layer is 10 7 -10 8 Ω, and after the double-sided tape provided by the utility model is heated at 80 DEG C for 5 min, the peeling force of the antistatic hot debondable acrylate adhesive layer rapidly decreases to below 150 gf / inch, the electronic product screen is very easy to disassemble, the antistatic acrylate adhesive layer still has a relatively high peeling force of 741-1124 gf / inch after being heated, can remain on the electronic product to continue lamination, and is convenient for rework or repair of mobile phones and other electronic products. BRIEF DESCRIPTION OF DRAWINGS

[0071] Figure 1 is a cross-sectional structure schematic view of the double-sided tape provided by the utility model embodiment 1;

[0072] Among them, 101-first release film layer, 102-antistatic acrylate adhesive layer, 103-antistatic TPU layer, 104-antistatic heat-reducing acrylate adhesive layer, and 105-second release film layer. Detailed Implementation

[0073] The technical solution of this utility model will be further described below with reference to the accompanying drawings and specific embodiments. Those skilled in the art should understand that the embodiments described are merely illustrative of this utility model and should not be considered as specific limitations thereof.

[0074] Example 1

[0075] A cross-sectional structural diagram of a double-sided tape is shown below. Figure 1 As shown, the release film includes a first release film layer 101, an antistatic acrylic adhesive layer 102, an antistatic TPU layer 103, an antistatic heat-resistant acrylic adhesive layer 104, and a second release film layer 105, which are sequentially stacked. The first release film layer is a colorless and transparent PET film layer with a thickness of 36 μm and a release force of 30 gf / 50 mm. The antistatic acrylic adhesive layer has a thickness of 19 μm. The antistatic TPU layer has a thickness of 12 μm. The antistatic heat-resistant acrylic adhesive layer has a thickness of 19 μm. The second release film layer is a blue PET film layer with a thickness of 25 μm and a release force of 15 gf / 50 mm.

[0076] The material of the antistatic acrylic adhesive layer is based on the adhesive disclosed in CN113604169A; the material of the antistatic TPU layer is based on the material disclosed in CN101743262A; the material of the antistatic heat-resistant acrylic adhesive layer is based on the adhesive disclosed in CN112662324A.

[0077] For example, the method for preparing the double-sided adhesive tape is as follows:

[0078] (1) The material coated with an antistatic TPU layer on the process release film is baked at 150°C for 4 min and then rolled up to obtain an antistatic TPU layer;

[0079] (2) The material of the antistatic acrylate adhesive layer is coated on the first release film layer, baked at 100°C for 3 minutes, and then bonded to the antistatic TPU layer;

[0080] (3) The material of the antistatic heat-reducing acrylic adhesive layer is coated on the second release film layer, baked at 100°C for 3 minutes, and then bonded to the other side of the antistatic TPU layer. After being rolled up, it is cured at 40°C for 72 hours to obtain the double-sided tape.

[0081] The double-sided tape provided in the present example was subjected to peeling force test according to GB / T 2792-2014, and the test method was as follows: the double-sided tape with a width of 25 mm and a length of 200 mm was pasted on a SUS304 plate, a rubber roller with a weight of 2 kg was rolled back and forth for 3 times at a speed of 600 mm / min, and then the test plate was placed in a tensile testing machine (Kejian, KJ-1065A-D) under the condition of 23±2℃ and 50±10% R.H. for 20 min, and the lower part of the test plate was bent by 180℃; the peeling was carried out at a speed of 300 mm / min, and the peeling length was more than 100 mm, and the strength was automatically recorded on the recording plate; the peeling force of the antistatic acrylic ester adhesive layer of the double-sided tape was 1485 gf / inch, and the peeling force of the antistatic heat-reduced adhesion acrylic ester adhesive layer was 1450 gf / inch;

[0082] The double-sided tape was heated at 80℃ for 5 min, and then the peeling force was tested according to the above method; the peeling force of the antistatic acrylic ester adhesive layer of the double-sided tape after heating was 741 gf / inch, and the peeling force of the antistatic heat-reduced adhesion acrylic ester adhesive layer was 85 gf / inch;

[0083] The double-sided tape was subjected to DuPont test, and the test conditions were as follows: the test plate was polycarbonate (PC), the pressure was 10 bar / 5 s, and the test plate was placed in a 23±2℃, 50±10% R.H. environment for 24 h; the test process was as follows: starting from 5 cm, the height was increased by 5 cm until the sample was damaged; the test environment was as follows: the temperature was 23±2℃, and the humidity was 50±10% R.H.; the test method was as follows: the double-sided tape was pasted between two PC plates, and then the test was carried out on the DuPont impact testing machine. The XY transverse impact strength of the double-sided tape was 0.72 J, and the Z longitudinal impact strength was 0.45 J;

[0084] The double-sided tape was subjected to antistatic performance test, and the test method was as follows: a SIMCO ST-4 (Japan SIMCO) with a weight of 687 g was placed on the side of the sample to be tested, the size of the sample was 100 mm×100 mm, the test area size was 50 mm×50 mm, and the test was carried out at 23±2℃ and 50±10% R.H.; the impedance of the antistatic acrylic ester adhesive layer was 10 7 Ω, and the impedance of the antistatic heat-reduced adhesion acrylic ester adhesive layer was 10 7 Ω;

[0085] The double-sided tape is subjected to disassembly and reworking test, and the test method is as follows: two double-sided tapes with a width of 10 mm and a length of 100 mm are attached between an anodized aluminum plate (Shanghai Pucheng Aluminum Industry) and a glass plate attached with a copper foil (copper foil manufacturer: Zhejiang Huayuan, glass plate manufacturer: Kunshan Ruida Star), the antistatic heat-reducing acrylate adhesive layer of the double-sided tape is attached with the glass plate attached with the copper foil, and the antistatic acrylate adhesive layer is attached with the anodized aluminum plate, the distance between the two double-sided tapes is 25 mm, a rubber roller with a weight of 2 kg is rolled back and forth for 3 times at a speed of 600 mm / min, then standing is performed, the standing condition is RT / 72 h, then heating is performed at 80 ℃ for 5 min, the glass plate surface is sucked by a suction cup, the glass plate with the copper foil is separated from the anodized aluminum plate, if the two are easily separated, the disassembly and reworking performance is excellent, if the two are not easily separated, the disassembly and reworking performance is poor; it is measured that the disassembly and reworking performance of the double-sided tape is excellent.

[0086] Example 2

[0087] A double-sided tape, which comprises a first release film layer, an antistatic acrylate adhesive layer, an antistatic TPU layer, an antistatic heat-reducing acrylate adhesive layer and a second release film layer which are sequentially stacked; wherein the first release film layer is a colorless and transparent PET film layer with a thickness of 40 μm and a release force of 30 gf / 50 mm; the thickness of the antistatic acrylate adhesive layer is 25 μm; the thickness of the antistatic TPU layer is 25 μm; the thickness of the antistatic heat-reducing acrylate adhesive layer is 25 μm; the second release film layer is a blue PET film layer with a thickness of 30 μm and a release force of 8 gf / 50 mm; the materials of the layers are the same as those in Example 1.

[0088] It is measured according to the test method in Example 1 that the peeling force of the antistatic acrylate adhesive layer before heating is 1979 gf / inch, the peeling force of the antistatic heat-reducing acrylate adhesive layer is 1958 gf / inch; the peeling force of the antistatic acrylate adhesive layer after heating at 80 ℃ for 5 min is 912 gf / inch, and the peeling force of the antistatic heat-reducing acrylate adhesive layer is 102 gf / inch; the XY transverse impact strength is 0.86 J; the Z longitudinal impact strength is 0.59 J; the impedance of the antistatic acrylate adhesive layer and the antistatic heat-reducing acrylate adhesive layer is both 10 8 Ω; the disassembly and reworking performance is excellent.

[0089] Example 3

[0090] A double-sided tape comprises a first release film layer, an antistatic acrylate adhesive layer, an antistatic TPU layer, an antistatic hot-debondable acrylate adhesive layer and a second release film layer which are sequentially stacked; wherein the first release film layer is a colorless transparent PET film layer with a thickness of 50 μm and a release force of 40 gf / 50 mm; the thickness of the antistatic acrylate adhesive layer is 40 μm; the thickness of the antistatic TPU layer is 50 μm; the thickness of the antistatic hot-debondable acrylate adhesive layer is 40 μm; the second release film layer is a blue PET film layer with a thickness of 40 μm and a release force of 15 gf / 50 mm; the materials of the layers are the same as in Example 1.

[0091] According to the test method in Example 1, the peel strength of the antistatic acrylate adhesive layer before heating is 2291 gf / inch, and the peel strength of the antistatic hot-debondable acrylate adhesive layer is 2247 gf / inch; after heating at 80℃ for 5 min, the peel strength of the antistatic acrylate adhesive layer is 1124 gf / inch, and the peel strength of the antistatic hot-debondable acrylate adhesive layer is 123 gf / inch; the XY transverse impact strength is 0.97 J; the Z longitudinal impact strength is 0.71 J; the impedance of the antistatic acrylate adhesive layer and the antistatic hot-debondable acrylate adhesive layer is both 10 8 Ω; the disassembly and heavy work performance is excellent.

[0092] Comparative Example 1

[0093] A double-sided tape, which is different from Example 1 only in that the antistatic TPU layer is replaced by a PET film layer with the same thickness, and the rest of the structure and materials are the same as in Example 1;

[0094] According to the test method in Example 1, the peel strength of the antistatic acrylate adhesive layer before heating is 1462 gf / inch, and the peel strength of the antistatic hot-debondable acrylate adhesive layer is 1492 gf / inch; after heating at 80℃ for 5 min, the peel strength of the antistatic acrylate adhesive layer is 735 gf / inch, and the peel strength of the antistatic hot-debondable acrylate adhesive layer is 92 gf / inch; the XY transverse impact strength is 0.43 J; the Z longitudinal impact strength is 0.22 J; the impedance of the antistatic acrylate adhesive layer and the antistatic hot-debondable acrylate adhesive layer is both 10 7 Ω; the disassembly and heavy work performance is excellent.

[0095] Comparative Example 2

[0096] A double-sided tape comprises a first release film layer, a first anti-static acrylic adhesive layer, an anti-static TPU layer, a second anti-static acrylic adhesive layer and a second release film layer which are sequentially stacked; wherein the first anti-static acrylic adhesive layer and the second anti-static acrylic adhesive layer have the same material and thickness, and the material of the first anti-static acrylic adhesive layer and the second anti-static acrylic adhesive layer is the same as that of the anti-static acrylic adhesive layer in Embodiment 1; and the materials and thicknesses of the other layers are the same as those in Embodiment 1.

[0097] According to the test method in Embodiment 1, the peel strength of the first anti-static acrylic adhesive layer before heating is 1462 gf / inch, and the peel strength of the second anti-static acrylic adhesive layer is 1478 gf / inch; after heating at 80℃ for 5 min, the peel strength of the first anti-static acrylic adhesive layer is 735 gf / inch, and the peel strength of the second anti-static acrylic adhesive layer is 746 gf / inch; the XY transverse impact strength is 0.74 J; the Z longitudinal impact strength is 0.43 J; the impedance of the first anti-static acrylic adhesive layer and the second anti-static acrylic adhesive layer is 10 7 Ω; and the disassembly is poor.

[0098] As can be seen from the comparison between Embodiment 1 and Comparative Examples 1-2, the double-sided tape provided by Embodiment 1 uses an anti-static TPU layer as a substrate layer, which can improve the impact resistance of the double-sided tape; and after heating at 80℃ for 5 min, the peel strength of the anti-static heat-reducing acrylic adhesive layer of the double-sided tape provided by Embodiment 1 rapidly decreases to below 150 gf / inch, and the mobile phone screen can be easily disassembled; in addition, the impedance of the double-sided tape provided by Embodiment 1 is small, which can avoid the influence of static electricity on electronic products.

[0099] The applicant declares that the detailed structural features of the utility model are illustrated by the above embodiments, but the utility model is not limited to the above detailed structural features, i.e. it does not mean that the utility model must rely on the above detailed structural features to be implemented. It should be understood by those skilled in the art that any improvement of the utility model, equivalent replacement of the components selected by the utility model, increase of auxiliary components, selection of specific modes, etc. fall within the protection scope and disclosure scope of the utility model.

Claims

1. A double-sided adhesive tape, characterized in that, The double-sided tape comprises an antistatic acrylic adhesive layer, an antistatic TPU layer, and an antistatic heat-resistant acrylic adhesive layer, which are stacked sequentially.

2. The double-sided tape according to claim 1, characterized in that, The thickness of the antistatic acrylate adhesive layer is 10-40 μm.

3. The double-sided adhesive tape according to claim 1, characterized in that, The peel strength of the antistatic acrylate adhesive layer is 1000-2500 gf / inch.

4. The double-sided tape according to claim 1, characterized in that, The thickness of the antistatic TPU layer is 5-50 μm.

5. The double-sided tape according to claim 1, characterized in that, The thickness of the antistatic heat-reducing acrylic adhesive layer is 10-40 μm.

6. The double-sided tape according to claim 1, characterized in that, The double-sided tape also includes a first release film layer; The first release film layer is bonded to the surface of the antistatic acrylate adhesive layer away from the antistatic TPU layer.

7. The double-sided tape according to claim 6, characterized in that, The thickness of the first release film layer is 30-50 μm; The release force of the first release film layer is 20-40gf / 50mm.

8. The double-sided adhesive tape according to claim 1, characterized in that, The double-sided tape also includes a second release film layer; The second release film layer is bonded to the surface of the antistatic heat-reducing acrylic adhesive layer away from the antistatic TPU layer.

9. The double-sided adhesive tape according to claim 8, characterized in that, The thickness of the second release film is 20-40 μm.

10. The double-sided adhesive tape according to claim 8, characterized in that, The release force of the second release film layer is 1-15gf / 50mm.

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