Preparation method of release film
By using a specific composition of antistatic coating in the release film, it ensures that the surface resistance changes almost unchanged after 200 days, solving the problem of degradation of antistatic properties of existing release films and improving the reliability of protective films of electronic products sex.
Patent Information
- Application Number
- CN202411214595.0
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2021-10-25
- Publication Date
- 2024-12-31
AI Technical Summary
The anti-static properties of existing release films will deteriorate over time, resulting in uncertain risks in electronic products in terms of electrostatic electricity, affecting the reliability and line accuracy of the product.
Using a preparation method including a substrate layer, an antistatic coating and a release agent coating, the antistatic coating is composed of polyurethane resin, sodium octyl sulfate, N-ethyl-N-(3-sulfopropyl)- The sodium salt of 3-methylaniline, hydroxyethyl cellulose and other ingredients are composed of them, formed by specific mixing and baking steps, ensuring that the surface resistance of the antistatic coating is almost unchanged after 200 days.
The antistatic performance reliability of the release film is effectively improved, so that the surface resistance of the antistatic coating is almost unchanged after 200 days, and the performance of the protective film is enhanced.
Smart Images
Figure CN119219957A_ABST
Abstract
Description
Technical Field
[0001] The invention belongs to the technical field of release films, and in particular relates to a method for preparing a release film. Background Art
[0002] At present, release films are widely used in the processing of electronic products. As electronic devices need to be thinner, lighter 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 it easy for dust to be adsorbed on the surface of the product, 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 method for preparing a release film, wherein the release film obtained by the preparation method can keep the surface resistance of the antistatic coating in the 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 method for preparing 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 the following steps: Step 1: 100 parts of polyurethane resin, 50 parts of polyvinyl alcohol, 3.5 parts of sodium octyl sulfate, 3 parts of sodium salt of N-ethyl-N-(3-sulfopropyl)-3-methylaniline, 10 parts of dibutyl sebacate, 55 parts of n-butanol, 28 parts of isobutyl acetate, 1 part of hydroxyethyl cellulose, 0.4 parts of 3-acetylbenzoic acid, 0.6 parts of triethylenetetramine, 0.8 parts of silane coupling agent, 0.6 parts of antioxidant and 1.2 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 antioxidant is selected from antioxidant 1010, antioxidant 1024 or antioxidant 2246.
[0006] 2. In the above scheme, the antioxidant is selected from antioxidant 1010.
[0007] 3. In the above scheme, the leveling agent is selected from one of leveling agent 440, leveling agent DC57 and leveling agent DC3.
[0008] 4. 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.
[0009] Due to the application of the above technical solution, the present invention has the following advantages compared with the prior art: The preparation method of the release film of the present invention comprises the following steps: the antistatic coating of the antistatic release film is obtained by further adding 0.8-1.5 parts of hydroxyethyl cellulose and 0.3-0.8 parts of 3-acetylbenzoic acid to 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. BRIEF DESCRIPTION OF THE DRAWINGS
[0010] Attached Figure 1 Schematic diagram of the release film structure obtained by the preparation method of the present invention.
[0011] In the above figures: 1. substrate layer; 2. antistatic coating; 3. release agent coating. DETAILED DESCRIPTION
[0012] The present invention can be further understood through the specific embodiments given below, but they are not intended to limit the present invention.
[0013] The present invention will be further described below in conjunction with embodiments: Embodiment: A method for preparing a release film, the antistatic release film comprising a substrate layer 1, an antistatic coating 2 and a release agent coating 3, the antistatic coating 2 being located between the release agent coating 3 and the substrate layer 1, the antistatic coating 2 being obtained by drying a coating liquid, the coating liquid being composed of the following components in parts by weight: 100 parts of a polyurethane resin, 50 parts of polyvinyl alcohol, 3.5 parts of sodium octyl sulfate, 3 parts of sodium salt of N-ethyl-N-(3-sulfopropyl)-3-methylaniline, 10 parts of dibutyl sebacate, 55 parts of n-butanol, 28 parts of isobutyl acetate, 1 part of hydroxyethyl cellulose, 0.4 parts of 3-acetylbenzoic acid, 0.6 parts of triethylenetetramine, 0.8 parts of a silane coupling agent, 0.6 parts of an antioxidant, and 1.2 parts of a leveling agent; The antistatic coating 2 is obtained by the following steps: Step 1: 100 parts of polyurethane resin, 50 parts of polyvinyl alcohol, 3.5 parts of sodium octyl sulfate, 3 parts of sodium salt of N-ethyl-N-(3-sulfopropyl)-3-methylaniline, 10 parts of dibutyl sebacate, 55 parts of n-butanol, 28 parts of isobutyl acetate, 1 part of hydroxyethyl cellulose, 0.4 parts of 3-acetylbenzoic acid, 0.6 parts of triethylenetetramine, 0.8 parts of silane coupling agent, 0.6 parts of antioxidant and 1.2 parts of leveling agent are mixed and stirred evenly to obtain a coating liquid; Step 2: uniformly coating the coating liquid on the substrate layer 1, and baking and drying to obtain an antistatic substrate film; Step 3: coating a release agent coating 3 on the surface of the antistatic substrate film to obtain an antistatic release film.
[0014] The antioxidant is selected from antioxidant 1010, the leveling agent is selected from leveling agent DC57, the substrate layer 1 is a PET layer, and the thickness of the antistatic coating 3 is 4 μm.
[0015] Comparative Examples 1-2: A method for preparing a release film, the release film comprising a substrate layer 1, an antistatic coating 2 and a release agent coating 3, the antistatic coating 2 being located between the release agent coating 3 and the substrate layer 1, the antistatic coating 2 being obtained by drying a coating liquid, the coating liquid being composed of the following components in parts by weight, as shown in Table 1: Table 1
[0016] The preparation method of the comparative example is the same as that of the embodiment.
[0017] The properties of the antistatic release films prepared in the above examples and comparative examples 1-2 are shown in Table 2: Table 2 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 of Table 3, 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.
[0018] 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 method for preparing a release film, characterized in that: The antistatic release film comprises a substrate layer (1), an antistatic coating (2) and a release agent coating (3), wherein the antistatic coating (2) is located between the release agent coating (3) and the substrate layer (1), and the antistatic coating (2) is obtained by the following steps: Step 1: 100 parts of polyurethane resin, 50 parts of polyvinyl alcohol, 3.5 parts of sodium octyl sulfate, 3 parts of sodium salt of N-ethyl-N-(3-sulfopropyl)-3-methylaniline, 10 parts of dibutyl sebacate, 55 parts of n-butanol, 28 parts of isobutyl acetate, 1 part of hydroxyethyl cellulose, 0.4 parts of 3-acetylbenzoic acid, 0.6 parts of triethylenetetramine, 0.8 parts of silane coupling agent, 0.6 parts of antioxidant and 1.2 parts of leveling agent are mixed and stirred evenly to obtain a coating liquid; Step 2: uniformly coating the coating liquid on the substrate layer (1), and baking and drying to obtain an antistatic substrate film; Step 3: coating a release agent coating (3) on the surface of the antistatic substrate film to obtain an antistatic release film.
2. The method for preparing a release film according to claim 1, wherein: The antioxidant is selected from antioxidant 1010, antioxidant 1024 or antioxidant 2246.
3. The method for preparing a release film according to claim 2, wherein: The antioxidant is selected from antioxidant 1010.
4. The method for preparing a release film according to claim 1, wherein: The leveling agent is selected from one of leveling agent 440, leveling agent DC57 and leveling agent DC3.
5. The method for preparing a release film according to claim 1, characterized in that: The substrate layer (1) 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.