Double-sided adhesive tape for protecting charging port of electronic product, preparation method of strong adhesive and acrylic polymer, and weak adhesive

Abstract

The invention discloses a double-sided adhesive tape for protecting a charging port of an electronic product, a preparation method of strong adhesive and an acrylic polymer, and weak adhesive. The double-sided adhesive tape comprises a base material layer, a strong adhesive layer covers one side of the base material layer, and a heavy release layer covers the strong adhesive layer; a weak adhesive layer covers the other side, and a light release layer covers the weak adhesive layer. The invention provides a strong and weak adhesive tape for protecting a charging port of an electronic product, a preparation method of strong adhesive and an acrylic polymer, and weak adhesive.

Description

Technical Field

[0001] The present application belongs to the field of adhesive technology, and particularly relates to a double-sided adhesive tape for protecting a charging port of an electronic product, and a method for preparing a strong adhesive and an acrylic polymer, and a weak adhesive. Background Art

[0002] With the popularity and rapid development of mobile devices, electronic products such as mobile phones and computers have become indispensable tools in people's daily lives. The charging port is one of the commonly used interfaces of these products. The common ones are Type-C and Lightning interfaces. Their lifespan and stability have an important impact on the user experience of electronic products. Therefore, it is very necessary to test the plug-in and unplug life of the charging ports of these electronic products. During the plug-in and unplug test, the exposed end face of the charging port is easily scratched and worn; the existing technology cannot effectively protect this. In order to protect the end face of the charging port, the inventor proposes a technical solution of setting tape on the end face.

[0003] However, the adhesive tape in the prior art is generally a single-sided adhesive. In a UV tackifying adhesive and a preparation method thereof with publication number CN116218423A, a substrate layer, an adhesive layer arranged on one side of the substrate layer, and a release layer on the adhesive layer are disclosed. In the prior art double-sided adhesive, such as publication number CN113249046A, a new type of double-sided adhesive tape is disclosed, including a first release layer, a first pressure-sensitive adhesive layer, a substrate layer, a second pressure-sensitive adhesive layer and a second release layer, wherein the first release layer is arranged above the pressure-sensitive adhesive layer, the first pressure-sensitive adhesive layer is arranged above the substrate layer, the second pressure-sensitive adhesive layer is arranged below the substrate layer, and the second release layer is arranged below the second pressure-sensitive adhesive layer. The adhesion degree of both sides of the double-sided adhesive is relatively high, and problems such as stringing and sticking may occur during the peeling and plugging process on the end face. Summary of the invention

[0004] The purpose of the present invention is to solve the existing problem that the exposed end face of the charging port is easily scratched and worn during the pull-out test, and to solve the problem that the existing adhesive has a high degree of adhesion. The present application provides a strong and weak adhesive tape that can be used to protect the charging port of electronic products, and a preparation method of strong adhesive and acrylic polymer, and weak adhesive.

[0005] In order to achieve the above-mentioned technical objectives, the following technical solutions are provided: In the first aspect, a double-sided tape for protecting the charging port of an electronic product comprises a substrate layer, one side of the substrate layer is covered with a strong adhesive layer, and the strong adhesive layer is covered with a heavy release layer; the other side of the substrate layer is covered with a weak adhesive layer, and the weak adhesive layer is covered with a light release layer.

[0006] In an operative manner, the thickness of the substrate layer is between 12 μm and 36 μm.

[0007] In an practicable manner, the thickness of the heavy release layer and the light release layer are respectively between 12 μm and 75 μm.

[0008] In an practicable manner, the thickness of the weak adhesive layer is 20 μm-40 μm.

[0009] In an practicable manner, the thickness of the strong adhesive layer is 5 μm-30 μm.

[0010] In the second aspect, a strong glue of a double-sided tape used to protect the charging port of an electronic product, the raw material components of the strong glue and their mass parts are: acrylic polymer: 100 parts; curing agent: 0.1-1 parts; organic solvent ethyl acetate: 100 parts.

[0011] In an practicable manner, the acrylic polymer components are as follows: soft monomer: 50-80%; hard monomer: 2-15%; functional monomer: 5-30%; initiator: 0.2-0.6%.

[0012] In an practicable manner, the soft monomer is selected from one or more of ethyl acrylate, n-butyl acrylate, isooctyl acrylate, lauryl acrylate and n-propyl acrylate.

[0013] In the third aspect, a weak adhesive of a double-sided adhesive tape for protecting a charging port of an electronic product, the raw material components of the weak adhesive and their weight parts are: 100 parts of acrylic resin 77307N, 0.2 parts of curing agent EC-85, and 80 parts of organic solvent ethyl acetate;

[0014] In a fourth aspect, a method for preparing an acrylic polymer in a strong glue comprises the following steps: adding a soft monomer, a hard monomer, and a functional monomer as components into a reactor; and a condenser is simultaneously present in the reactor;

[0015] Step 2: nitrogen is introduced into the reactor, and the nitrogen flow rate is 0.2 ML / min; the stirring speed in the reactor is 80R / min-100R / min, and the temperature is heated to 70°C-90°C;

[0016] Step 3: continuously add initiator to the reactor and maintain the temperature;

[0017] Step 4: reflux reaction in the reactor for 3 hours;

[0018] Step 5: The temperature in the reactor is cooled to 50°C, and then the reactants are taken out.

[0019] Compared with the prior art, the present invention has the following beneficial effects:

[0020] This technical solution provides a strong and weak adhesive tape that can be used to protect the charging port of electronic products. The weak surface adhesive layer is a self-synthesized acrylic polymer. The molecular weight of the polymer is controlled to ensure the product's adhesion to the object being pasted. The proportion of soft and hard monomers is adjusted to achieve the effect of no residual adhesive or offset printing after the product is torn off. Compared with the silicone series products on the market, it can not only meet the product's use effect, but also significantly reduce the company's material costs. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] 1 substrate layer, 2 strong adhesive layer, 3 heavy release layer, 4 weak adhesive layer, 5 light release layer,

[0022] Figure 1 This is a schematic diagram of the structure of the first embodiment; DETAILED DESCRIPTION

[0023] like Figure 1 The first embodiment shown is a double-sided tape for protecting the charging port of an electronic product, comprising a substrate layer 1, one side of the substrate layer 1 is covered with a strong adhesive layer 2, and the strong adhesive layer 2 is covered with a heavy release layer 3; the other side is covered with a weak adhesive layer 4, and the weak adhesive layer 4 is covered with a light release layer 5.

[0024] In this embodiment, the thickness of the substrate layer is between 12 μm and 36 μm, and the substrate layer can be PET, PI, etc., and the color can be transparent, black, yellow, white, etc.

[0025] In this embodiment, the thickness of the heavy release layer and the light release layer are respectively between 12μm and 75μm. Among them, the release layer can be made of PET, glassine paper and other materials, and the thickness of the light release layer is 12-36μm; the color can be transparent, red, blue, white, yellow, etc., the release force is 5-25g, and the residual adhesion is greater than 85%. The thickness of the heavy release layer is 36-75μm; the color can be transparent, red, blue, white, yellow, etc., the release force is 20-45g, and the residual adhesion is greater than 85%.

[0026] In this embodiment, the thickness of the weak adhesive layer is 20 μm-40 μm, and the adhesive force (SUS) of the weak adhesive layer is greater than 2500 g.

[0027] In this embodiment, the thickness of the strong adhesive layer is 5 μm-30 μm, and the adhesive force of the strong adhesive layer is 900-1300 g.

[0028] The preparation method of this embodiment 1 is the same as that of embodiment 1.1, and the preparation method is as follows: acrylic resin, curing agent, and organic solvent are placed in a stirring kettle and stirred for 50 minutes at a speed of 600 RPM to obtain a weak adhesive. A slit coating head is used to coat the PET substrate, and the light release profile is attached to obtain a weak adhesive layer.

[0029] Then use the slit coating head to coat the other side of the substrate, and attach the heavy release profile to obtain a strong adhesive layer. The oven temperature for acrylic polymer is 100℃~110℃, and the time is 2-4min. The oven temperature for silicone resin is 130℃~160℃, and the time is 2-4min.

[0030] Embodiment 2, a weak adhesive of a double-sided tape for protecting the charging port of an electronic product, i.e., used to prepare the weak adhesive layer in Embodiment 1, wherein the weak adhesive layer is an acrylic adhesive layer, and the raw materials for preparation include, by weight percentage, 100 parts of acrylic resin, 0.1 to 1 parts of curing agent, and 70-100 parts of organic solvent.

[0031] In this embodiment, the weak glue is prepared as in Embodiment 2.1, with 100 parts of acrylic resin 77307N, 0.2 parts of curing agent EC-85, and 80 parts of organic solvent EAC. The mixture is placed in a stirring kettle and stirred for 50 minutes at a speed of 600 RPM to obtain a weak glue layer.

[0032] As comparative example 2.2 of example 2.1, 100 parts of acrylic resin 77307N, 0.2 parts of curing agent EC-85, and 80 parts of organic solvent EAC were placed in a stirring kettle and stirred for 50 minutes at a speed of 600 RPM to obtain a weak adhesive layer.

[0033] Among them, in the prior art, weak glue can be used on both sides of the double-sided tape used to protect the charging port of electronic products, so the comparative example 2.2 is matched with the comparative example 3, acrylic resin Y-1410: 100 parts, curing agent Y-105: 0.8 parts, organic solvent EAC: 80 parts; put it into a stirring kettle and stir for 50 minutes at a speed of 600RPM to obtain a weak glue, but it serves as a strong glue layer.

[0034] Embodiment 3, a strong adhesive for double-sided tape used to protect the charging port of electronic products, that is, used to prepare the strong adhesive layer in Embodiment 1, the strong adhesive layer is one of acrylic acid and silicone resin, preferably acrylic adhesive layer. The raw material components and their weight parts of the strong adhesive are: acrylic polymer: 100 parts; curing agent: 0.1-1 parts; organic solvent ethyl acetate: 100 parts.

[0035] The acrylic polymer components are as follows: soft monomer: 50-80%; hard monomer: 2-15%; functional monomer: 5-30%; initiator: 0.2-0.6%.

[0036] The soft monomer is selected from one or more of ethyl acrylate, n-butyl acrylate, isooctyl acrylate, lauryl acrylate and n-propyl acrylate.

[0037] The hard monomer is selected from one or more of acrylic acid, methacrylic acid, methyl acrylate, ethyl methacrylate and methyl methacrylate.

[0038] The functional monomer is one or more of acrylonitrile, acrylic acid, methacrylic acid, hydroxypropyl acrylate and acrylonitrile.

[0039] The initiator is selected from one or more of azobisisobutyronitrile, azobisisoheptanenitrile, azobisisovaleronitrile, benzoyl peroxide and tert-butyl peroxyhexahydroterephthalate.

[0040] The organic solvent is selected from one or more of ethyl acetate, toluene, xylene and butanone.

[0041] In Example 3, the preparation method of the acrylic acid polymer is the same as that of Example 4;

[0042] Embodiment 4, the preparation method of acrylic polymer in strong glue, the first step: adding soft monomer, hard monomer and functional monomer of components into a reactor; and a condenser is simultaneously present in the reactor; the second step: nitrogen is introduced into the reactor, and the nitrogen flow rate is 0.2ML / min; and the stirring speed in the reactor is 80R / min-100R / min, and the temperature is heated to 70℃-90℃; the third step: continuously adding initiator to the reactor and maintaining the temperature; the fourth step: conducting a reflux reaction in the reactor for 3h; the fifth step: cooling the temperature in the reactor to 50℃, and then taking out the reactants.

[0043] Specifically, in Example 4.1, 60 parts of ethyl acrylate, 22 parts of isooctyl acrylate, 5 parts of methyl acrylate, 1 part of acrylonitrile and 0.05 parts of azobisisobutyronitrile as soft monomers, hard monomers and functional monomers of the above proportions are added in sequence to the bottom of the reaction chamber equipped with a condenser, a stirring paddle and a thermometer, and the mixture is stirred at a speed of 80-100 R / min for 30 minutes under nitrogen protection (gas flow rate 0.2 ML / min), heated to 70-90 degrees, and the initiator solution is continuously added dropwise, the temperature is raised to 70-90°C, refluxed for 3 hours, and cooled to 50°C for discharge. Acrylic polymer is obtained.

[0044] Example 4.2, 60 parts of ethyl acrylate, 22 parts of isooctyl acrylate, 7 parts of methyl acrylate, 1 part of acrylonitrile and 0.05 parts of azobisisobutyronitrile as the above proportion of soft monomer, hard monomer and functional monomer were added in sequence to the bottom of the reaction chamber equipped with a condenser, a stirring paddle and a thermometer, under nitrogen protection (gas flow rate 0.2ML / min), stirring speed 80-100R / min, stirring for 30min, heating to 70-90 degrees, starting to continuously drop the initiator solution, heating to 70-90°C, reflux reaction for 3h, cooling to 50°C and discharging. Acrylic polymer was obtained.

[0045] Example 4.3, 60 parts of ethyl acrylate, 22 parts of isooctyl acrylate, 9 parts of methyl acrylate, 1 part of acrylonitrile and 0.05 parts of azobisisobutyronitrile as the above proportion of soft monomer, hard monomer and functional monomer were added in sequence to the bottom of the reaction chamber equipped with a condenser, a stirring blade and a thermometer, under nitrogen protection (gas flow rate 0.2ML / min), stirring speed 80-100R / min, stirring for 30min, heating to 70-90 degrees, starting to continuously drop the initiator solution, heating to 70-90°C, reflux reaction for 3h, cooling to 50°C and discharging. Acrylic polymer was obtained.

[0046] Example 4.4, 60 parts of ethyl acrylate, 22 parts of isooctyl acrylate, 11 parts of methyl acrylate, 1 part of acrylonitrile and 0.05 parts of azobisisobutyronitrile as the above proportion of soft monomer, hard monomer and functional monomer were added in sequence to the bottom of the reaction chamber equipped with a condenser, a stirring paddle and a thermometer, under nitrogen protection (gas flow rate 0.2ML / min), stirring speed 80-100R / min, stirring for 30min, heating to 70-90 degrees, starting to continuously drop the initiator solution, heating to 70-90°C, reflux reaction for 3h, cooling to 50°C and discharging. Acrylic polymer was obtained.

[0047] Example 4.5, 60 parts of ethyl acrylate, 22 parts of isooctyl acrylate, 13 parts of methyl acrylate, 1 part of acrylonitrile and 0.05 parts of azobisisobutyronitrile as soft monomers, hard monomers and functional monomers in the above proportions were added in sequence to the bottom of the reaction chamber equipped with a condenser, a stirring paddle and a thermometer, and the mixture was stirred at a speed of 80-100 R / min for 30 minutes under nitrogen protection (gas flow rate 0.2 ML / min), heated to 70-90 degrees, and the initiator solution was continuously added dropwise, the temperature was raised to 70-90°C, and the reaction was refluxed for 3 hours. The temperature was lowered to 50°C and the material was discharged. Acrylic polymer was obtained.

[0048] Comparative Example 4.1 of Example 4 is to sequentially add 60 parts of ethyl acrylate, 22 parts of isooctyl acrylate, 0 parts of methyl acrylate, 1 part of acrylonitrile and 0.05 parts of azobisisobutyronitrile as soft monomers, hard monomers and functional monomers in the above proportions to the bottom of the reaction chamber equipped with a condenser, a stirring paddle and a thermometer, under nitrogen protection (gas flow rate 0.2 ML / min), stirring at a speed of 80-100 R / min, stirring for 30 minutes, heating to 70-90 degrees, starting to continuously drop the initiator solution, heating to 70-90°C, reflux reaction for 3 hours, cooling to 50°C and discharging. Acrylic polymer is obtained.

[0049] 100 parts of the acrylic polymer prepared in Example 4 and other components in Example 3, specifically 0.8 parts of curing agent L-75 and 80 parts of organic solvent ethyl acetate, were placed in a stirring kettle and stirred for 50 minutes at a speed of 600 RPM to obtain the strong glue in Example 3, which was used for the strong glue layer.

[0050] As a comparative example 3 of the third embodiment, a strong adhesive of a double-sided adhesive tape for protecting the charging port of an electronic product is used to prepare the strong adhesive layer in the first embodiment, and the strong adhesive layer is one of Dow Corning's 7667 and 7687; the cross-linking agent can be any one of Dow Corning's 7028 and 7678. The catalyst is platinum catalyst 4000. The anchoring agent can be any one of Dow Corning's 297 and 9250.

[0051] The preparation method of comparative example 3 is as follows: comparative example 3.1, 100 parts of silicone resin 7687, 0.15 parts of cross-linking agent 7028, 0.7 parts of anchoring agent 297, 1.1 parts of catalyst 4000, and 200 parts of organic solvent toluene; put into a stirring kettle and stir for 50 minutes at a speed of 600RPM to obtain a strong glue.

[0052] The double-sided adhesive tape for protecting the charging port of electronic products was obtained by preparing Example 2 through Example 2.1 and Example 3 through Example 4 and then through Example 1.1.

[0053] The specific strong and weak adhesives used in the preparation of double-sided tape and the experimental data are shown in Table 1:

[0054]

[0055]

[0056] Table 1

[0057] The peel force test standard is GB / T 2792-2014. The residual adhesive verification is as follows: the sample preparation shall refer to GB / T2792-2014, and the residual adhesive shall be visually observed after rapid tearing at 180°.

[0058] Among them, Example 3 prepared in Example 3.1 uses silicone resin, which has similar physical properties to the examples but is more expensive, increasing production costs and being detrimental to the production efficiency of the enterprise; Example 3 prepared in Example 4.1 uses acrylic polymer without adding hard monomers, resulting in an overly soft adhesive layer, which easily causes residual adhesive on the surface of the adhered object when quickly torn off, and is not conducive to customer use; Example 3 prepared in Example 2.2 uses purchased acrylic resin, and compared with the homemade acrylic polymer, residual adhesive is found after time verification.

[0059] Although the embodiments of the present invention have been shown and described above, it is to be understood that the above embodiments are exemplary and are not to be construed as limitations of the present invention. A person skilled in the art may change, modify, replace and vary the above embodiments within the scope of the present invention.

[0060] In addition, the terms "first" and "second" are used for descriptive purposes only and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In the description of this patent application, the meaning of "plurality" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0061] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art may combine and combine the different embodiments or examples described in this specification and the features of the different embodiments or examples, without contradiction.

[0062] Although the embodiments of the present invention have been shown and described above, it is to be understood that the above embodiments are exemplary and are not to be construed as limitations of the present invention. A person skilled in the art may change, modify, replace and vary the above embodiments within the scope of the present invention.

Claims

1. A double-sided tape for protecting the charging port of an electronic product, characterized in that: The invention comprises a substrate layer (1), one side of the substrate layer (1) is covered with a strong adhesive layer (2), and the strong adhesive layer (2) is covered with a heavy release layer (3); the other side is covered with a weak adhesive layer (4), and the weak adhesive layer (4) is covered with a light release layer (5).

2. The double-sided tape for protecting the charging port of electronic products according to claim 1, characterized in that: The thickness of the substrate layer (1) is between 12 μm and 36 μm.

3. The double-sided adhesive tape for protecting the charging port of electronic products according to claim 1 or 2, characterized in that: The thickness of the heavy release layer (3) and the light release layer (5) are respectively between 12 μm and 75 μm.

4. The double-sided tape for protecting the charging port of electronic products according to claim 3, characterized in that: The thickness of the weak adhesive layer (4) is 20 μm-40 μm.

5. The double-sided adhesive tape for protecting the charging port of electronic products according to claim 4, characterized in that: The thickness of the strong adhesive layer (2) is 5 μm-30 μm.

6. The strong adhesive of the double-sided adhesive tape for protecting the charging port of electronic products according to any one of claims 1 to 5, characterized in that: The raw material components of the strong glue and their weight parts are: acrylic polymer: 100 parts; curing agent: 0.1-1 parts; organic solvent ethyl acetate: 100 parts.

7. The strong glue according to claim 6, characterized in that The acrylic polymer components are as follows: soft monomer: 50-80%; hard monomer: 2-15%; functional monomer: 5-30%; Initiator: 0.2-0.6%.

8. The strong glue according to claim 7, characterized in that the soft monomer is selected from one or more of ethyl acrylate, n-butyl acrylate, isooctyl acrylate, lauryl acrylate and n-propyl acrylate.

9. The weak adhesive of the double-sided adhesive tape for protecting the charging port of electronic products according to any one of claims 1 to 5, characterized in that: The raw material components of the weak glue and their weight parts are: acrylic resin 77307N: 100 parts, curing agent EC-85: 0.2 parts, organic solvent ethyl acetate: 80 parts.

10. The method for preparing the acrylic polymer in the strong glue according to any one of claims 7 to 8, characterized in that: The first step: adding soft monomers, hard monomers and functional monomers of the components into a reactor; and a condenser is also present in the reactor; Step 2: nitrogen is introduced into the reactor, and the nitrogen flow rate is 0.2 ML / min; the stirring speed in the reactor is 80R / min-100R / min, and the temperature is heated to 70°C-90°C; Step 3: continuously adding the initiator into the reactor and maintaining the temperature; Step 4: reflux reaction is carried out in the reactor for 3 hours; Step 5: The temperature in the reactor is cooled to 50° C., and then the reactants are taken out.

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