High-reliability protective film

Abstract

The invention discloses a high-reliability protective film which comprises a base material layer, an antistatic coating and a release agent coating, and the antistatic coating is located between the release agent coating and the base material layer. The antistatic coating is obtained by the following steps: mixing polyurethane resin, polyvinyl alcohol, sodium octyl sulfate, N-ethyl-N-3-methylaniline sodium salt, dibutyl sebacate, n-butyl alcohol, isobutyl acetate, hydroxyethyl cellulose, 3-acetylbenzoic acid, triethylene tetramine, a silane coupling agent, an antioxidant and a flatting agent, uniformly stirring, adding a dispersing agent, a defoaming agent and a defoaming agent, and uniformly stirring to obtain the antistatic coating. Coating liquid is obtained; uniformly coating the base material layer with the coating liquid, and baking and drying to obtain an antistatic base material film; the base material layer is one of a PET layer, a TPU layer, a PAR layer, a CPP layer, a PVC layer, an SEPS layer and an SEBS layer. The surface resistance of the high-reliability protective film can be kept stable after 200 days.

Description

Technical Field

[0001] The invention belongs to the technical field of functional films, and in particular relates to a high-reliability protective film. Background Art

[0002] Release film refers to a film with a separable surface. The release film is non-sticky or slightly sticky when in contact with specific materials under limited conditions. The production of common release films is generally to treat the surface of polyester film, including coating with silicone release agent, fluorine release agent or plasma treatment. Release film materials are widely used in electronics, printed circuit boards, packaging, membrane switches, waterproof materials, adhesive products, die-cutting and punching processing and other industries. With the demand for electronic devices to be thinner and smaller, the power density of electrical operations needs to be continuously improved. The application scenarios of these electronic products generally have anti-static requirements, because the existence of static electricity not only makes the surface of the product easy to absorb dust, but also affects the accuracy of the circuit, or causes the circuit to break down during the processing of electronic products, making the product invalid. Therefore, it is necessary to perform electrostatic protection on the protective film. The anti-static performance of existing release films will deteriorate over time, bringing uncertain risks to the product. Summary of the invention

[0003] The object of the present invention is to provide a high-reliability protective film, which can keep the surface resistance of the antistatic coating in the antistatic release film almost unchanged after 200 days, thereby improving the reliability of the performance of the protective film.

[0004] To achieve the above object, the technical solution adopted by the present invention is: a high reliability protective film, comprising a substrate layer, an antistatic coating and a release agent coating, wherein the antistatic coating is located between the release agent coating and the substrate layer, and the antistatic coating is obtained by the following steps: Step 1: 100 parts of polyurethane resin, 55 parts of polyvinyl alcohol, 3.5 parts of sodium octyl sulfate, 3 parts of sodium salt of N-ethyl-N-(3-sulfopropyl)-3-methylaniline, 9 parts of dibutyl sebacate, 45 parts of n-butanol, 24 parts of isobutyl acetate, 1 part of hydroxyethyl cellulose, 0.5 parts of 3-acetylbenzoic acid, 0.3 parts of triethylenetetramine, 1 part of silane coupling agent, 0.8 parts of antioxidant and 0.8 parts of leveling agent are mixed and stirred evenly to obtain a coating liquid; Step 2: evenly coating the coating liquid on the substrate layer, and baking and drying to obtain an antistatic substrate film; Step 3: coating a release agent coating on the surface of the antistatic substrate film to obtain an antistatic release film.

[0005] The technical solution further improved in the above technical solution is as follows: 1. In the above scheme, the substrate layer is one of a PET layer, a TPU layer, a PAR layer, a CPP layer, a PVC layer, a SEPS layer and a SEBS layer.

[0006] 2. In the above solution, the substrate layer is a PVC layer.

[0007] 3. In the above scheme, the thickness of the antistatic coating is 3~10μm.

[0008] 4. In the above scheme, the thickness of the antistatic coating is 6 μm.

[0009] Due to the application of the above technical solution, the present invention has the following advantages compared with the prior art: The high-reliability protective film of the present invention has an antistatic coating in which 0.8-1.5 parts of hydroxyethyl cellulose and 0.3-0.8 parts of 3-acetylbenzoic acid are further added to the antistatic coating based on sodium octyl sulfate and sodium salt of N-ethyl-N-(3-sulfopropyl)-3-methylaniline, so that the surface resistance of the antistatic coating in the antistatic release film can be kept almost unchanged after 200 days, thereby improving the reliability of the performance of the protective film. DETAILED DESCRIPTION

[0010] The present invention can be further understood through the specific embodiments given below, but they are not intended to limit the present invention.

[0011] The present invention will be further described below in conjunction with embodiments: Embodiment: A high-reliability protective film, the protective film comprising a substrate layer, an antistatic coating and a release agent coating, the antistatic coating being located between the release agent coating and the substrate layer, the antistatic coating being obtained by drying a coating liquid, the coating liquid being composed of the following components in parts by weight: 100 parts of polyurethane resin, 55 parts of polyvinyl alcohol, 3.5 parts of sodium octyl sulfate, 3 parts of sodium salt of N-ethyl-N-(3-sulfopropyl)-3-methylaniline, 9 parts of dibutyl sebacate, 45 parts of n-butanol, 24 parts of isobutyl acetate, 1 part of hydroxyethyl cellulose, 0.5 parts of 3-acetylbenzoic acid, 0.3 parts of triethylenetetramine, 1 part of silane coupling agent, 0.8 parts of antioxidant, and 0.8 parts of leveling agent; The antistatic coating 2 is obtained by the following steps: Step 1: 100 parts of polyurethane resin, 55 parts of polyvinyl alcohol, 3.5 parts of sodium octyl sulfate, 3 parts of sodium salt of N-ethyl-N-(3-sulfopropyl)-3-methylaniline, 9 parts of dibutyl sebacate, 45 parts of n-butanol, 24 parts of isobutyl acetate, 1 part of hydroxyethyl cellulose, 0.5 parts of 3-acetylbenzoic acid, 0.3 parts of triethylenetetramine, 1 part of silane coupling agent, 0.8 parts of antioxidant and 0.8 parts of leveling agent are mixed and stirred evenly to obtain a coating liquid; Step 2: evenly coating the coating liquid on the substrate layer, and baking and drying to obtain an antistatic substrate film; Step 3: coating a release agent coating on the surface of the antistatic substrate film to obtain an antistatic release film.

[0012] The antioxidant in Example 2 is selected from antioxidant 1010, the leveling agent is selected from leveling agent DC3, the substrate layer 1 is a PVC layer, and the thickness of the antistatic coating 3 is 6 μm.

[0013] Comparative Examples 1-2: A release film, comprising a substrate layer, an antistatic coating and a release agent coating, wherein the antistatic coating is located between the release agent coating and the substrate layer, and the antistatic coating is obtained by drying a coating liquid, wherein the coating liquid is composed of the following components in parts by weight, as shown in Table 1: Table 1

[0014] The preparation method of the comparative example is the same as that of the embodiment.

[0015] The properties of the release films prepared in the above examples and comparative examples 1-2 are shown in Table 2: Table 2

[0016] The surface impedance was tested by a surface impedance tester SRM-110 on the antistatic coating in the antistatic release film obtained in the embodiments and the comparative examples according to ASTM-D257. As shown in the evaluation results in Table 2, the surface impedance of the antistatic coating in the antistatic release film in each embodiment was almost unchanged after 200 days, while the surface impedance of the comparative example increased after 200 days. The present invention allows the surface resistance of the antistatic coating in the antistatic release film to remain almost unchanged after 200 days, thereby improving the reliability of the performance of the protective film.

[0017] The above embodiments are only for illustrating the technical concept and features of the present invention, and their purpose is to enable people familiar with the technology to understand the content of the present invention and implement it accordingly, and they cannot be used to limit the protection scope of the present invention. Any equivalent changes or modifications made according to the spirit of the present invention should be included in the protection scope of the present invention.

Claims

1. A high reliability protective film, characterized in that: The protective film comprises a substrate layer, an antistatic coating and a release agent coating, wherein the antistatic coating is located between the release agent coating and the substrate layer, and the antistatic coating is obtained by the following steps: Step 1: 100 parts of polyurethane resin, 55 parts of polyvinyl alcohol, 3.5 parts of sodium octyl sulfate, 3 parts of sodium salt of N-ethyl-N-(3-sulfopropyl)-3-methylaniline, 9 parts of dibutyl sebacate, 45 parts of n-butanol, 24 parts of isobutyl acetate, 1 part of hydroxyethyl cellulose, 0.5 parts of 3-acetylbenzoic acid, 0.3 parts of triethylenetetramine, 1 part of silane coupling agent, 0.8 parts of antioxidant and 0.8 parts of leveling agent are mixed and stirred evenly to obtain a coating liquid; Step 2: evenly coating the coating liquid on the substrate layer, and baking and drying to obtain an antistatic substrate film; Step 3: coating a release agent coating on the surface of the antistatic substrate film to obtain an antistatic release film.

2. The high reliability protective film according to claim 1, characterized in that: The substrate layer is one of a PET layer, a TPU layer, a PAR layer, a CPP layer, a PVC layer, a SEPS layer and a SEBS layer.

3. The high reliability protective film according to claim 2, characterized in that: The substrate layer is a PVC layer.

4. The high reliability protective film according to claim 1, characterized in that: The thickness of the antistatic coating is 3-10 μm.

5. The high reliability protective film according to claim 4, characterized in that: The thickness of the antistatic coating is 6 μm.

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