USE OF HIGH-PERFORMANCE ULTRA-THIN DOUBLE-SIDED ADHESIVE TAPE IN WIRELESS CHARGING

Abstract

The invention relates to the technical field of adhesive tape and discloses an use of a high-performance ultra-thin double-sided adhesive tape in wireless charging, including a polyester film substrate, a high-performance adhesive coating coated on both sides of the polyester film, wherein the high-performance adhesive coating is composed of the following parts by weight of each component uniformly mixed: 100-140 parts by weight of high-performance acrylic pressure sensitive adhesive, 15-20 parts by weight of curing agent, and 130-160 parts by weight of ethyl acetate. The thickness of the adhesive tape is 0.003-0.010 mm, with a good adhesion and a mechanical strength.

Claims

1. A high-performance ultra-thin double-sided adhesive tape, which is prepared by the following steps: A1. preparation of high-performance adhesive coating: weighing 100-140 parts of high-performance acrylic pressure sensitive adhesive, 15-20 parts of curing agent, and 130-160 parts of ethyl acetate, stirring and mixing them evenly, and setting it aside; A2. cleaning a polyester film material, removing oil and impurities on a surface, and setting it aside; A3. fully filtering the adhesive coating prepared in step A1 with a 600 mesh filter cloth, and sealing for use after the filtration; A4. transferring the adhesive coating prepared by A3 to coat one side of the polyester film material prepared by A2 by using micro-gravure coating; A5. drying, and storing a semi-finished polyester film double-sided adhesive tape into a roll; A6. transferring the adhesive coating prepared by A3 to coat the other side of a substrate of the semi-finished polyester film double-sided adhesive tape prepared by A4 by using the micro-gravure coating; A7. drying, and storing the prepared high-performance ultra-thin double-sided adhesive tape into a roll.

2. The high-performance ultra-thin double-sided adhesive tape according to claim 1, wherein an overall thickness of a polyester film substrate coated with the high-performance adhesive coating on both sides is 0.003-0.010 mm, and wherein a thickness of the polyester film substrate is 1.4 μm.

3. The high-performance ultra-thin double-sided adhesive tape according to claim 1, wherein the high-performance acrylic pressure sensitive adhesive comprises 40-60 parts of acrylate copolymer, 20-30 parts of toluene, and 15-25 parts of ethyl acetate, the acrylate copolymer is composed of methyl methacrylate, ethyl methacrylate, ethyl acrylate, butyl acrylate, and 2-ethylhexyl methacrylate.

4. The high-performance ultra-thin double-sided adhesive tape according to claim 1, wherein the curing agent comprises 45% isocyanate and 55% ethyl acetate.

5. The high-performance ultra-thin double-sided adhesive tape according to claim 1, wherein a coating amount of the micro-gravure coating is 15-30 g/m.sup.2, and a coating speed is 20±2 m/min.

6. The high-performance ultra-thin double-sided adhesive tape according to claim 1, further comprising a step of attaching a release layer to the high-performance adhesive coating.

7. An use of the high-performance ultra-thin double-sided adhesive tape according to any one of claims 1 to 6 in wireless charging.

Description

BRIEF DESCRIPTION OF THE DRAWINGS

[0022] FIG. 1 is a schematic cross-sectional structure diagram of a high-performance ultra-thin double-sided adhesive tape of the present invention;

[0023] FIG. 2 is a schematic diagram of the adhesion test;

[0024] FIG. 3 is a schematic diagram of the retention test;

[0025] FIG. 4 is a schematic diagram of the tensile strength test of the substrate.

[0026] In the figures, 1-release layer; 2-high-performance adhesive coating; 3-polyester film substrate.

DETAILED DESCRIPTION OF THE EMBODIMENTS

[0027] As shown in FIG. 1, the present application provides a high-performance ultra-thin double-sided adhesive tape, comprising a polyester film substrate, a high-performance adhesive coating coated on both sides of the polyester film, wherein the high-performance adhesive coating is composed of the following parts by weight of each component uniformly mixed: 100-140 parts by weight of high-performance acrylic pressure sensitive adhesive, 15-20 parts by weight of curing agent, and 130-160 parts by weight of ethyl acetate.

[0028] Through the improvement of raw materials, the control of drying moisture, the improvement of the extrusion process, the electrostatic adsorption process and the control of the heat shrinkage rate, the thickness of the polyester film can be as low as 1.4 μm.

[0029] The high-performance acrylic pressure sensitive adhesive comprises 40-60 parts of acrylate copolymer, 20-30 parts of toluene, and 15-25 parts of ethyl acetate. The acrylate copolymer is composed of methyl methacrylate, ethyl methacrylate, ethyl acrylate, butyl acrylate, and 2-ethylhexyl methacrylate.

[0030] The curing agent comprises 45% isocyanate and 55% ethyl acetate. Because the substrate is thin, adding an appropriate amount of curing agent to the adhesive can achieve the effect of high peeling force.

[0031] Further, the high-performance adhesive coating is coated on both sides of the polyester film substrate, and a release layer is attached to the high-performance adhesive coating, wherein the release layer is preferably a PET release film.

[0032] The resulting high-performance ultra-thin double-sided adhesive tape may used for wireless charging. For example, it is used for bonding of heat dissipation materials such as graphite and nanocrystalline for wireless charging, and fixing of circuit boards, etc.

[0033] The specific production process of a high-performance double-sided adhesive tape is as follows: [0034] A1. preparation of high-performance adhesive coating: weighing 100-140 parts of high-performance acrylic pressure sensitive adhesive, 15-20 parts of curing agent, and 130-160 parts of ethyl acetate, stirring and mixing them evenly, and setting it aside; [0035] A2. cleaning the polyester film material, removing the oil and impurities on the surface, and setting it aside; [0036] A3. fully filtering the adhesive coating prepared in step A1 with a 600 mesh filter cloth, and sealing for use after the filtration; [0037] A4. transferring the adhesive coating prepared by A3 to coat one side of the polyester film material prepared by A2 by using micro-gravure coating; [0038] A5. drying, and storing the resulting semi-finished polyester film double-sided adhesive tape into a roll; [0039] A6. transferring the adhesive coating prepared by A3 to coat the other side of the substrate of the semi-finished polyester film double-sided adhesive tape prepared by A4 by using micro-gravure coating; [0040] A7. drying, attaching the release layer on the adhesive coating, and storing the resulting high-performance ultra-thin double-sided adhesive tape into a roll.

[0041] The high-performance adhesive coating is coated on the polyester film substrate by micro-gravure coating, a coating amount is 15-30 g/m.sup.2, and a coating speed is 20±2 m/min The thickness of the resulting double-sided adhesive tape is 0.003-0.010mm.

[0042] Embodiment 1

[0043] The preparation of high-performance adhesive coating: firstly, weighing 40-60 parts of acrylate copolymer, 20-30 parts of toluene, and 15-25 parts of ethyl acetate to prepare the high-performance acrylic pressure sensitive adhesive, and then weighting 100 parts of the high-performance acrylic pressure sensitive adhesive, 15 parts of curing agent, and 130 parts of ethyl acetate to stir and mix evenly to obtain the adhesive coating, wherein the curing agent comprises 45% isocyanate and 55% ethyl acetate, and setting it aside; then cleaning the polyester film material, removing the oil and impurities on the surface, and setting it aside; then fully filtering the resulting adhesive coating with a 600 mesh filter cloth, and sealing for use after the filtration; then transferring the resulting adhesive coating to one side of the polyester film material by using micro-gravure coating, with a coating amount of 15g/m.sup.2 and a coating speed of 18 m/min, and then drying, and storing the semi-finished polyester film double-sided adhesive tape into a roll; transferring the resulting adhesive coating to the other side of the substrate of the semi-finished polyester film double-sided adhesive tape by using micro-gravure coating, with a coating amount of 15 g/m.sup.2 and a coating speed of 18 m/min; and then drying, attaching the release layer on the adhesive coating, and storing the high-performance ultra-thin double-sided adhesive tape into a roll, wherein the release layer is a PET release film. The resulting high-performance ultra-thin double-sided adhesive tape has a thickness of 0.003-0.004 mm.

[0044] Embodiment 2

[0045] The difference between this embodiment and Embodiment 1 is that the formula for preparing the high-performance ultra-thin double-sided adhesive tape is 140 parts of high-performance acrylic pressure sensitive adhesive, 20 parts of curing agent, and 160 parts of ethyl acetate. The coating process parameters are coating amount of 30 g/m.sup.2 and the coating speed of 22 m/min. The resulting high-performance ultra-thin double-sided adhesive tape has a thickness of 0.004-0.005 mm.

[0046] Embodiment 3

[0047] The difference between this embodiment and Embodiment 1 is that the formula for preparing the high-performance ultra-thin double-sided adhesive tape is 120 parts of high-performance acrylic pressure sensitive adhesive, 18 parts of curing agent, and 150 parts of ethyl acetate. The coating process parameters are coating amount of 25g/m.sup.2 and the coating speed of 20 m/min. The resulting high-performance ultra-thin double-sided adhesive tape has a thickness of 0.004 mm.

[0048] Performance test:

[0049] Adhesion test (20 min 180° peeling strength): [0050] Test standard: ASTM D3330 [0051] Cutting width: 25 mm [0052] Bonding condition: rolling mill (2KG roller) [0053] Backing material: 25 μPET [0054] Test environment: T=22±5° C., RH=55±10% [0055] Peeling speed: 300 mm/min

[0056] Retention test: [0057] Test standard: ASTM D3654 [0058] Cutting specification: 90 mm*25 mm [0059] Bonding condition: 2KG pressing roller [0060] Backing material: 25 μPET

[0061] Testing at room temperature, the adhesive tape and SUS are attached and left for 20 minutes, and then placed in the retention tester, and then the weight is hung to start the test; testing the temperature resistance, the adhesive tape and SUS are attached and left for 20 minutes, and then placed in the retention tester and left for 20 minutes, and then the weight is hung to start the test.

[0062] Substrate tensile strength test: [0063] Test standard: ASTM D3759 [0064] Cutting specification: 25 mm*150 mm (the length of the sample between the upper and lower clamps is 100 mm) [0065] Test environment: T=22±5° C., RH=55±10% [0066] Tensile strength: 300 mm/min [0067] The above-prepared double-sided adhesive tape was subjected to related performance tests, and the results are shown in Table 1.

TABLE-US-00001 TABLE 1 Performance test results of the adhesive tapes obtained in Embodiments 1 to 3 Embodiment Embodiment Embodiment Item 1 2 3 Test condition 180° peeling  642 g/25 mm  712 g/25 mm  682 g/25 mm W = 25 mm, strength test V = 300 mm/min (A/B sides) Turn 25μPET test A/B sides  0.8 mm  1.0 mm  1.0 mm 0.5 KG/24 H room T = 22 ± 5° C., temperature RH = 55 ± 10% retention Longitudinal   50   50   50 T = 24° C., tensile RH = 60% strength Mpa Transverse   40   40   40 tensile strength Mpa Longitudinal   85   85   85 percentage of breaking elongation % Transverse   80   80   80 percentage of breaking elongation %

[0068] It can be seen from Table 1 that the thickness of the ultra-thin double-sided adhesive tape obtained in this application is 0.003-0.010 mm, and still obtains a good adhesion, the adhesion between the substrate and the adhesive is large, and the mechanical property of the adhesive tape is excellent. In summary, the benefits of this product are: it can improve the thickness, enhance the peeling performance, high temperature resistance, and improve the soft adhesion. The implementation of this application can improve the core competitiveness of our company in the adhesive tape field, which is important significance. The continuous improvement of the quality of self-made high-performance ultra-thin double-sided adhesive tape can drive the common development of enterprises in this industry.