WO2020258699A1 - Anti-fingerprint tape for wireless charger - Google Patents

Abstract

The present invention discloses an anti-fingerprint adhesive for wireless charger, including a black ink layer, a substrate layer and an adhesive layer, the black ink layer and the adhesive layer are respectively located on the upper surface and the lower surface of the substrate layer, a release layer is provided on the side of the adhesive layer opposite to the substrate layer; the black ink layer is obtained by drying the black ink, this black ink is composed of the following parts by weight: 60-80 parts of aqueous polyurethane, 1-5 parts of carbon black, 1-5 parts of 1,1',1''-methylidynetris(4-isocyanatobenzene), 1-1.5 parts of sodium silicate, 1-1.5 parts of carboxymethyl cellulose, 0.1-0.3 parts of sodium tripolyphosphate, 1-5 parts of polyethyleneimine, 0.5-2 parts of octadecyl dimethyl benzyl ammonium chloride, 2-4 parts of light absorber, 0.5-1.5 parts of coupling agent, 0.5-1 part of chitosan, 15-25 parts of deionized water. The anti-fingerprint tape for wireless charger of the present invention has anti-fingerprint performance, will not leave fingerprint traces after repeated use in various environments, which can avoid the corrosion of the tape caused by fingerprints and sweat stains.

Description

Anti-fingerprint tape for wireless charger Technical field

The invention belongs to the technical field of adhesive tapes, and in particular relates to an anti-fingerprint adhesive tape for wireless chargers.

Background technique

Wireless charging technology, also known as inductive charging and non-contact charging, is a new type of charging technology derived from wireless power transmission technology. Wireless charging technology has developed rapidly in recent years, but it has also encountered many technical problems, such as improving charging efficiency, reducing costs, and the effective charging distance is too short. In order to obtain higher charging efficiency and reduce or eliminate the influence of electromagnetic field on the mobile phone during charging, electromagnetic shielding film is required for shielding. The function of the electromagnetic shielding film is to insulate the electromagnetic field from the influence of the mobile phone, and prevent materials such as metals from absorbing the electromagnetic waves emitted by the transmitting end device and generating a magnetic field in the opposite direction. In the mobile phone wireless charging receiving end, if there is no electromagnetic shielding film, the wireless charging device cannot complete the short-distance charging work. The electromagnetic shielding film needs to be fixed on the interference source with tape.

At present, this kind of tape does not have anti-fingerprint performance. The fingerprint traces left after repeated use will not only affect the appearance, but also have a certain impact on the performance of the film. Therefore, how to develop an anti-fingerprint adhesive tape has become a direction for those skilled in the art.

Summary of the invention

The purpose of the present invention is to provide an anti-fingerprint adhesive tape for wireless chargers. The anti-fingerprint adhesive tape for wireless chargers has anti-fingerprint performance. It will not leave fingerprint traces after repeated use in various environments and can avoid fingerprints. Sweat stains corrode the tape.

To achieve the above objective, the technical solution adopted by the present invention is: an anti-fingerprint adhesive tape for wireless chargers, comprising a black ink layer, a substrate layer and an adhesive layer, the black ink layer and the adhesive layer are respectively Located on the upper surface and the lower surface of the substrate layer, a release layer is provided on the side of the adhesive layer opposite to the substrate layer;

The black ink layer is obtained by drying the black ink, and the black ink is composed of the following components by weight:

The further improved technical solutions among the above technical solutions are as follows:

1. In the above solution, the light absorbing agent is selected from nano Al/Al ₂ O ₃ core-shell materials, nano nickel powder or nickel powder/carbon nanotube composite.

2. In the above scheme, the coupling agent is selected from one of coupling agent KH-580, coupling agent KH-561, and coupling agent KBM403.

3. In the above solution, the substrate layer is a PET polyester film of 2 to 4 μm.

4. In the above solution, the thickness of the black ink layer is 1 to 2 μm.

Due to the application of the above technical solutions, the present invention has the following advantages compared with the prior art:

The anti-fingerprint adhesive tape of the present invention is used for wireless chargers, which is achieved by adding polyethyleneimine, octadecane to water-based polyurethane, carbon black and 1,1',1"-methine tris(4-isocyanate)benzene. Alkyl dimethyl benzyl ammonium chloride makes the anti-fingerprint tape of the present invention have anti-fingerprint performance, and will not leave fingerprint traces after repeated use in various environments, and can avoid the corrosion of the tape caused by fingerprint sweat stains; Enhance the dirt resistance performance of the anti-fingerprint tape of the present invention, that is, the dirt on the tape can be easily wiped off after a period of time in a high-temperature and high-humidity environment without residue, which not only reduces the adhesion of stains, but also greatly reduces the cleaning Difficulty.

Description of the drawings

Fig. 1 is a schematic diagram of the structure of the anti-fingerprint adhesive tape used in the wireless charger of the present invention.

In the above drawings: 1. Black ink layer; 2. Base material layer; 3. Adhesive layer; 4. Release layer.

Detailed ways

In the description of this patent, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. The indicated orientation or positional relationship is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the pointed device or element must have a specific orientation or a specific orientation. Therefore, the construction and operation cannot be construed as limiting the present invention; the terms "first", "second", and "third" are only used for descriptive purposes and cannot be understood as indicating or implying relative importance; in addition, unless otherwise stated Clearly stipulated and defined, the terms "installation", "connection" and "connection" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or a connection. Electrical connection; it can be directly connected, or indirectly connected through an intermediate medium, and it can be the internal communication between two components. For those of ordinary skill in the art, the specific meaning of the above terms in this patent can be understood under specific circumstances.

The present invention will be further described below in conjunction with embodiments:

Embodiments 1 to 4: An anti-fingerprint adhesive tape for wireless chargers, comprising a black ink layer 1, a substrate layer 2, and an adhesive layer 3. The black ink layer 1 and the adhesive layer 3 are respectively located on the base On the upper surface and the lower surface of the material layer 2, a release layer 4 is provided on the side of the adhesive layer 3 opposite to the substrate layer 2;

The black ink layer 1 is obtained by drying the black ink, which is composed of the following parts by weight, as shown in Table 1:

Table 1

Component	Example 1	Example 2	Example 3	Example 4
Waterborne polyurethane	60 servings	75 servings	80 servings	65 servings
Carbon black	1 serving	5 servings	3 copies	2 servings
1,1’,1"-methine tris(4-isocyanate)benzene	1.5 servings	2 servings	1 serving	5 servings
Sodium silicate	1.5 servings	1.2 copies	1 serving	1.3 servings
Carboxymethyl cellulose	1.2 copies	1.5 servings	1.4 copies	1 serving
sodium tripolyphosphate	0.1 part	0.2 parts	0.3 copies	0.25 serving
Polyethyleneimine	1 serving	5 servings	3 copies	2 servings
Octadecyl dimethyl benzyl ammonium chloride	2 servings	0.5 serving	1 serving	1.5 servings
Light absorber	2 servings	3 copies	2.5 servings	4 parts
Coupling agent	1 serving	0.5 serving	0.8 copies	1.5 servings
Chitosan	0.8 copies	0.6 copies	0.5 serving	1 serving
Deionized water	18 servings	25 servings	15 servings	16 servings

In Example 1, the light absorbing agent is selected from nano Al/Al ₂ O ₃ core-shell materials, the coupling agent is selected from coupling agent KH-580, the substrate layer 2 is a 2 μm thick PET layer, and the black ink layer 1 is The thickness is 1 μm.

In Example 2, the light absorbing agent is selected from nano-nickel powder, the coupling agent is selected from the coupling agent KBM403, the substrate layer 2 is a 2.5 μm thick PET layer, and the thickness of the black ink layer 1 is 1.3 μm.

In Example 3, the light absorbing agent was selected from the nickel powder/carbon nanotube composite, the above coupling agent was selected from the coupling agent KH-561, the above substrate layer 2 was a 4 μm thick PET layer, and the above black ink layer 1 had a thickness of 2μm.

In Example 4, the light absorbing agent is selected from nickel powder/carbon nanotube composites, the above coupling agent is selected from coupling agent KH-580, the above substrate layer 2 is a 3.5 μm thick PET layer, and the thickness of the above black ink layer 1 It is 1.5μm.

The preparation method of the anti-fingerprint adhesive tape for wireless chargers is as follows: 60 to 80 parts of water-based polyurethane, 15 to 25 parts of deionized water, 1 to 5 parts of 1,1',1"-methine tris(4- Isocyanic acid) benzene, 0.01 to 0.03 parts of sodium tripolyphosphate, 1 to 5 parts of carbon black, 1 to 1.5 parts of sodium silicate, 1 to 5 parts of polyethyleneimine, 0.5 to 2 parts of octadecyl dimethyl Benzyl ammonium chloride, 0.5 to 1.5 parts of coupling agent, 1 to 1.5 parts of carboxymethyl cellulose, 2 to 4 parts of light absorbing agent, 0.5 to 1 part of chitosan are added to the high-speed stirring dispersant for stirring, and the mixture is evenly mixed. Get black ink;

The black ink is coated on the substrate layer 2 and dried to obtain an anti-fingerprint tape for wireless chargers.

Comparative examples 1 to 2: An anti-fingerprint adhesive tape for wireless chargers, comprising a black ink layer 1, a base material layer 2, and an adhesive layer 3. The black ink layer 1 and the adhesive layer 3 are respectively located on the base On the upper surface and the lower surface of the material layer 2, a release layer 4 is provided on the side of the adhesive layer 3 opposite to the substrate layer 2;

The black ink layer 1 is obtained by drying the black ink, which is composed of the following parts by weight, as shown in Table 2:

Table 2

Component	Comparative example 1	Comparative example 2
Waterborne polyurethane	60 servings	80 servings
Carbon black	1 serving	5 servings
1,1’,1"-methine tris(4-isocyanate)benzene	1.8 servings	2 servings
Sodium silicate	1.5 servings	1.2 copies
Carboxymethyl cellulose	1.2 copies	1.5 servings
sodium tripolyphosphate	0.1 part	0.2 parts
Polyethyleneimine	-	5 servings
Octadecyl dimethyl benzyl ammonium chloride	2 servings	-
Light absorber	2.5 servings	3 copies
Coupling agent	0.8 copies	0.5 serving
Chitosan	0.8 copies	0.6 copies
Deionized water	18 servings	20 servings

The preparation method of the comparative example is the same as that of the embodiment.

In Comparative Example 1, the light absorbing agent is selected from nano Al/Al ₂ O ₃ core-shell materials, the above coupling agent is selected from the coupling agent KH-580, the above substrate layer 2 is a 2 μm thick PET layer, and the above black ink layer 1 The thickness is 1 μm.

In Comparative Example 2, the light absorbing agent is selected from nano-nickel powder, the coupling agent is selected from the coupling agent KBM403, the substrate layer 2 is a 2.5 μm thick PET layer, and the thickness of the black ink layer 1 is 1.3 μm.

The performance of the anti-fingerprint adhesive tape for wireless chargers prepared in the foregoing Examples 1 to 4 and Comparative Examples 1 to 2 is shown in Table 3:

table 3

The test method is as follows:

Anti-fingerprint test: Press 10 times with your finger on the black ink layer to observe the appearance of the black ink layer. The meanings of the relevant symbols in Table 3 are as follows:

○: No fingerprint

×: Fingerprint;

Dirt resistance test: Use a ZEBRA oil-based pen. The oil-based pen is at an angle of about 90° with the surface of the film. Apply a force of about 1N to draw 5 10mm handwritings on the surface of the film at a constant speed, and then place the sample at a temperature of 60°C. Keep it in an environment with a humidity of 95% for 2 hours. After taking it out, wipe the surface with alcohol. If there is no trace on the surface of the sample, it is qualified.

As shown in the evaluation results in Table 3, the anti-fingerprint adhesive tape used in the wireless charger of the embodiment has excellent anti-fingerprint performance, no traces will remain under the condition of multiple finger presses, and the dirt on the tape is high at high temperature. It can be easily wiped off without leaving residue for a period of time in a wet environment, while the anti-fingerprint performance of Comparative Example 1 is relatively poor, and the dirt-resistant performance of Comparative Example 2 is even worse; it can be seen that the present invention not only improves the anti-fingerprint performance, but also makes The anti-fingerprint tape for the wireless charger enhances the stain resistance, that is, the dirt on the tape can be easily wiped off after a period of time in a high temperature and high humidity environment without residue, which not only reduces the adhesion of stains, but also greatly reduces Difficulty in cleaning.

The above-mentioned embodiments are only to illustrate the technical concept and characteristics of the present invention, and their purpose is to enable those familiar with the technology to understand the content of the present invention and implement them accordingly, and cannot limit the protection scope of the present invention. All equivalent changes or modifications made according to the spirit of the present invention should be covered by the protection scope of the present invention.

Claims (5)

1. An anti-fingerprint adhesive tape for wireless chargers, which is characterized in that it comprises a black ink layer (1), a substrate layer (2) and an adhesive layer (3). The black ink layer (1) and the adhesive The agent layer (3) is located on the upper surface and the lower surface of the substrate layer (2), respectively, and the adhesive layer (3) is provided with a release layer (4) on the side opposite to the substrate layer (2);

   The black ink layer (1) is obtained by drying the black ink, and the black ink is composed of the following components by weight:

   
2. The anti-fingerprint tape for wireless chargers according to claim 1, wherein the light absorbing agent is selected from nano Al/Al ₂ O ₃ core-shell materials, nano nickel powder or nickel powder/carbon nanotube composite One of them.
3. The anti-fingerprint adhesive tape for wireless chargers according to claim 1, wherein the coupling agent is selected from one of coupling agent KH-580, coupling agent KH-561, and coupling agent KBM403 .
4. The anti-fingerprint tape for wireless chargers according to any one of claims 1 to 3, wherein the base layer (1) is a PET polyester film of 2 to 4 μm.
5. The anti-fingerprint tape for wireless chargers according to any one of claims 1 to 3, wherein the thickness of the black ink layer (1) is 1 to 2 μm.

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