Self-adhesive label paper and preparation process thereof

Abstract

The embodiment of the invention provides self-adhesive label paper which comprises a surface film layer, a middle layer and a bottom adhesive layer, the middle layer is arranged between the surface film layer and the self-adhesive layer, and the middle layer comprises the following components in parts by mass: lead powder, an organic adhesive, an antioxidant, a functional auxiliary agent, a dispersing agent, a thickening agent and a coloring agent. In the label ink, the lead powder and the organic adhesive are compatible, the antioxidant is used for preventing the lead powder from discoloring, the dispersing agent and the thickening agent are selected to ensure that the lead powder is uniformly dispersed and is prevented from being stacked, and the coloring agent is adopted to enhance the appearance of a label; in the production process, even if the defective label falls off and is rolled into a battery cell, the lead powder contained in the self-adhesive label is dark gray due to high density and strong X-ray absorption capability during X-ray detection, so that the battery doped with the defective label can be conveniently found out, and defective products are prevented from flowing out of the market.

Description

Technical Field

[0001] The embodiments of the present invention relate to, but are not limited to, the field of self-adhesive labels, and particularly to a self-adhesive label paper and its preparation process. Background Technology

[0002] During battery production, defective products need to be inspected and marked. The way to mark defective products is to attach self-adhesive labels to a conspicuous position for easy identification. Given the complexity of the battery production environment, there have been cases where defective labels have fallen off and gotten into the battery cells during production, causing battery damage. Therefore, X-ray inspection of products is required during production to prevent products with defective labels mixed inside the battery cells from entering the market.

[0003] Existing products image objects by X-rays penetrating them. Different materials have different absorption and penetration capabilities for X-rays, so ordinary self-adhesive labels cannot meet the X-ray detection requirements of products. Therefore, it is necessary to develop a self-adhesive label that can pass X-ray detection. Summary of the Invention

[0004] (a) Technical problems to be solved In view of the above-mentioned shortcomings and deficiencies of the prior art, the present invention provides a self-adhesive label paper that solves the technical problem that existing products cannot meet the X-ray detection requirements of products because different materials have different absorption and penetration capabilities of X-rays after X-rays penetrate the object for imaging.

[0005] (II) Technical Solution The purpose of this invention is to provide a self-adhesive label paper, comprising a surface film layer, an intermediate layer, and a base adhesive layer, wherein the intermediate layer is disposed between the surface film layer and the self-adhesive layer, and the components of the intermediate layer include, by weight: 12-20 parts lead powder 60-70 parts organic adhesive Antioxidant 1-3 parts 5-8 parts of functional additives 5-10 parts of dispersant 8-12 parts thickener Colorant 0.5-1.5 parts.

[0006] Preferably, the lead powder is composed of particles with a diameter of 1-10 μm.

[0007] Preferably, the organic adhesive is one of acrylic resin and polyurethane resin.

[0008] Preferably, the antioxidant is one of calcium stearate and phosphite.

[0009] Preferably, the functional additive is one of conductive carbon black and indium tin oxide.

[0010] Preferably, the colorant is one or both of water-soluble azo pigments and insoluble azo pigments.

[0011] On the other hand, this application also discloses a process for preparing self-adhesive label paper, including the following steps: S1. Lead powder surface treatment: lead powder and silane coupling agent are ultrasonically dispersed in ethanol solution; S2. Ink preparation: Dissolve the organic binder and solvent at 50°C by stirring. Add the antioxidant and dispersant in sequence, and then stir at 800 r / min for 20 minutes. Next, slowly add the lead powder and colorant, and stir with a high-speed disperser for 30 minutes. Finally, add the functional additives and thickener, and adjust the viscosity to 2000 cP. S3. Coating: The prepared ink is printed onto the surface film layer through a printing roller to form an intermediate layer, and then a film is laminated and an adhesive is applied; the substrate is either PET film or synthetic paper, and its thickness is 50 to 150 μm; S4. Drying and curing: Set the temperature to 80-100℃ through the hot air drying channel, and the drying time is 1-5 minutes. S5. Cutting: Cut the dried and cured product to remove blank areas and form label paper.

[0012] (III) Beneficial Effects In label inks, lead powder and organic adhesives are compatible, antioxidants are used to prevent lead powder from discoloring, and the selection of dispersants and thickeners ensures uniform dispersion of lead powder and inhibits stacking. The use of colorants enhances the appearance of the label. During the production process, even if a defective label falls off and gets into the battery cell, when X-rayed, the lead powder contained in the self-adhesive label will appear dark gray due to its high density and strong X-ray absorption capacity. This makes it easier to identify batteries mixed with defective labels and prevents defective products from entering the market. Detailed Implementation

[0013] To make the objectives, technical solutions, and advantages of this invention clearer, the invention will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative and not intended to limit the invention.

[0014] Example 1: A self-adhesive label paper includes a surface film layer, an intermediate layer, and a base adhesive layer, wherein the intermediate layer is disposed between the surface film layer and the self-adhesive layer, and the components of the intermediate layer include, by weight: 12 parts aluminum powder, 60 parts organic binder, 1 part antioxidant, 5 parts functional additives, 5 parts dispersant, 8 parts thickener, 0.5 parts colorant; The self-adhesive label manufacturing process in this embodiment includes the following steps: S1. Lead powder surface treatment: lead powder and silane coupling agent are ultrasonically dispersed in ethanol solution; S2. Ink preparation: Dissolve the organic binder and solvent at 50°C by stirring. Add the antioxidant and dispersant in sequence, and then stir at 800 r / min for 20 minutes. Next, slowly add lead powder and colorant, and stir with a high-speed disperser for 30 minutes. Finally, add functional additives and thickeners to adjust the viscosity to 2000 cP. S3. Coating: The prepared ink is printed onto the surface film layer through a printing roller to form an intermediate layer, and then a film is laminated and an adhesive is applied; the substrate is either PET film or synthetic paper, and its thickness is 50 to 150 μm; S4. Drying and curing: Set the temperature to 85℃ through the hot air drying channel and dry for 5 minutes; S5. Cutting: Cut the dried and cured product to remove blank areas and form label paper; In a preferred embodiment, the lead powder is a particle with a diameter of 1-10 μm, while this embodiment uses 5 μm as an example.

[0015] In this embodiment, the organic adhesive is an acrylic resin.

[0016] In this embodiment, the antioxidant is calcium stearate.

[0017] In this embodiment, the functional additive is conductive carbon black.

[0018] In this embodiment, the colorant is a water-soluble azo pigment.

[0019] In this embodiment, the dispersant is a polyhydroxy acid salt; the thickener is fumed silica.

[0020] Example 2: A self-adhesive label paper includes a surface film layer, an intermediate layer, and a base adhesive layer, wherein the intermediate layer is disposed between the surface film layer and the self-adhesive layer, and the components of the intermediate layer include, by weight: A self-adhesive label paper includes a surface film layer, an intermediate layer, and a base adhesive layer, wherein the intermediate layer is disposed between the surface film layer and the self-adhesive layer, and the components of the intermediate layer include, by weight: 16 parts aluminum powder, 65 parts organic binder, 2 parts antioxidant, 7 parts functional additives, 7 parts dispersant, 10 parts thickener, 1 part colorant; The self-adhesive label manufacturing process in this embodiment includes the following steps: S1. Lead powder surface treatment: lead powder and silane coupling agent are ultrasonically dispersed in ethanol solution; S2. Ink preparation: Dissolve the organic binder and solvent at 50°C by stirring. Add the antioxidant and dispersant in sequence, and then stir at 800 r / min for 20 minutes. Next, slowly add lead powder and colorant, and stir with a high-speed disperser for 30 minutes. Finally, add functional additives and thickeners to adjust the viscosity to 2000 cP. S3. Coating: The prepared ink is printed onto the surface film layer through a printing roller to form an intermediate layer, and then a film is laminated and an adhesive is applied; the substrate is either PET film or synthetic paper, and its thickness is 50 to 150 μm; S4. Drying and curing: Set the temperature to 90℃ through the hot air drying channel and dry for 3 minutes; S5. Cutting: Cut the dried and cured product to remove blank areas and form label paper; In a preferred embodiment, the lead powder is a particle with a diameter of 1-10 μm, while this embodiment uses 5 μm as an example.

[0021] In this embodiment, the organic adhesive is polyurethane resin.

[0022] In this embodiment, the antioxidant is a phosphite.

[0023] In this embodiment, the functional additive is indium tin oxide.

[0024] In this embodiment, the colorant is an insoluble azo pigment.

[0025] In this embodiment, the dispersant is a polyhydroxy acid salt; the thickener is fumed silica.

[0026] Example 3: A self-adhesive label paper includes a surface film layer, an intermediate layer, and a base adhesive layer, wherein the intermediate layer is disposed between the surface film layer and the self-adhesive layer, and the components of the intermediate layer include, by weight: 20 parts aluminum powder, 70 parts organic binder, 3 parts antioxidant, 8 parts functional additives, 10 parts dispersant, 12 parts thickener, 1.5 parts colorant; The self-adhesive label manufacturing process in this embodiment includes the following steps: S1. Lead powder surface treatment: lead powder and silane coupling agent are ultrasonically dispersed in ethanol solution; S2. Ink preparation: Dissolve the organic binder and solvent at 50°C by stirring. Add the antioxidant and dispersant in sequence, and then stir at 800 r / min for 20 minutes. Next, slowly add lead powder and colorant, and stir with a high-speed disperser for 30 minutes. Finally, add functional additives and thickeners to adjust the viscosity to 2000 cP. S3. Coating: The prepared ink is printed onto the surface film layer through a printing roller to form an intermediate layer, and then a film is laminated and an adhesive is applied; the substrate is either PET film or synthetic paper, and its thickness is 50 to 150 μm; S4. Drying and curing: Set the temperature to 100℃ through the hot air drying channel and dry for 2 minutes; S5. Cutting: Cut the dried and cured product to remove blank areas and form label paper; In a preferred embodiment, the lead powder is a particle with a diameter of 1-10 μm, while this embodiment uses 5 μm as an example.

[0027] In this embodiment, the organic adhesive is an acrylic resin.

[0028] In this embodiment, the antioxidant is a phosphite.

[0029] In this embodiment, the functional additive is indium tin oxide.

[0030] In this embodiment, the colorant is a water-soluble azo pigment.

[0031] In this embodiment, the dispersant is a polyhydroxy acid salt; the thickener is fumed silica. The specific performance test results of Examples 1, 2, and 3 above are shown in the table below:

[0032] As can be seen from the results shown in the table above, the self-adhesive label paper prepared in Examples 1, 2, and 3 of this application has excellent overall performance, which can be fully demonstrated in X-ray inspection instruments. That is, the self-adhesive label paper prepared in the technical solution defined in this application has excellent performance.

[0033] In label inks, lead powder and organic adhesives are compatible, antioxidants are used to prevent lead powder from discoloring, and the selection of dispersants and thickeners ensures uniform dispersion of lead powder and inhibits stacking. The use of colorants enhances the appearance of the label. During the production process, even if a defective label falls off and gets into the battery cell, when X-rayed, the lead powder contained in the self-adhesive label will appear dark gray due to its high density and strong X-ray absorption capacity. This makes it easier to identify batteries mixed with defective labels and prevents defective products from entering the market.

[0034] Although embodiments of the present invention have been shown above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention. Those skilled in the art can make modifications and variations to the above embodiments, but all such modifications are included within the broad scope of the foregoing disclosure and claims.

Claims

1. An adhesive label sheet, characterized by The label paper comprises a surface film layer, an intermediate layer and a bottom adhesive layer, wherein the intermediate layer is arranged between the surface film layer and the bottom adhesive layer, and the components of the intermediate layer comprise, by mass fraction: Lead powder 12-20 parts Organic adhesive 60-70 parts Antioxidant 1-3 parts Functional additive 5-8 parts Dispersant 5-10 parts Thickening agent 8-12 parts Colorant 0.5-1.5 parts.

2. The adhesive label paper according to claim 1, characterized in that: The lead powder is a particle with a diameter of 1-10 μm.

3. The label stock of claim 1, wherein: The organic adhesive is one of acrylic resin and polyurethane resin.

4. The label stock of claim 1, wherein: The antioxidant is one of calcium stearate and phosphite.

5. The label stock of claim 1, wherein: The functional additive is one of conductive carbon black and indium tin oxide.

6. The label stock of claim 1, wherein: The colorant is one or both of water-soluble azo pigment and insoluble azo pigment.

7. A process for preparing a self-adhesive label paper, characterized by, The method comprises the following steps: S1, lead powder surface treatment: ultrasonic dispersion of lead powder and silane coupling agent in ethanol solution; S2, ink preparation: stirring and dissolving the organic adhesive and solvent at 50°C, sequentially adding the antioxidant and dispersant, then stirring at 800 r / min for 20 minutes; then, slowly adding the lead powder and colorant, and stirring with a high-speed dispersing machine for 30 min; finally, adding the functional additive and thickening agent, and adjusting the viscosity to 2000 cP; S3, coating: printing the prepared ink on the surface film layer to form the intermediate layer by a printing roller, then laminating and coating; the substrate is one of PET film and synthetic paper, and the thickness is 50-150 μm; S4, drying and curing: setting the hot air drying channel at 80-100°C, and the drying time is 1-5 min; S5, cutting: cutting the product after drying and curing to remove the blank position, and forming the label paper.

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