High tensile strength film and preparation method and application thereof

Abstract

The present invention provides a high tensile strength film and a preparation method and application thereof, wherein the high tensile strength film comprises the following raw materials in parts by weight: 80-95 parts of polypropylene resin; 2-10 parts of glass fiber; 2-5 parts of toughening agent; 0.1-0.5 parts of antioxidant; 0.1-0.3 parts of light stabilizer; 0.1-0.5 parts of lubricant; and 0.1-0.5 parts of antistatic agent. The present invention improves the mechanical strength of the film and avoids the film from being easily broken during electrophoresis plating.

Description

Technical Field

[0001] The invention belongs to the technical field of polypropylene films, and in particular relates to a high tensile strength film and a preparation method and application thereof. Background Art

[0002] In capacitor manufacturing, the two electrodes of the capacitor are usually composed of a metal layer. This metal coating needs to be evenly and tightly attached to the surface of the film to ensure good electrical contact and stable electrical properties. Currently, metal particles or metal ions are deposited on the surface of the polypropylene film through electrophoretic plating technology to form a uniform metallization layer. Commonly used metal materials include aluminum, copper, etc. The metallized polypropylene film becomes the anode electrode or cathode electrode of the capacitor. Due to the low mechanical strength of the current film, it is easy to break during electrophoretic plating. Summary of the invention

[0003] In view of the deficiencies in the prior art, the present invention provides a high tensile strength film and a preparation method and application thereof, which improve the mechanical strength of the film and avoid the film from being easily broken during electrophoresis plating.

[0004] In order to achieve the above object, the present invention adopts the following technical solutions: In a first aspect, the present invention provides a high tensile strength film, comprising the following raw materials in parts by weight: 80-95 parts of polypropylene resin; 2-10 parts of glass fiber; 2-5 parts of toughening agent; 0.1-0.5 parts of antioxidant; 0.1-0.3 parts of light stabilizer; 0.1-0.5 parts of lubricant; and 0.1-0.5 parts of antistatic agent.

[0005] Preferably, the polypropylene resin comprises homopolypropylene or copolymer polypropylene.

[0006] Preferably, the toughening agent comprises styrene-butadiene rubber or fluororubber.

[0007] Preferably, the antioxidant comprises tert-butyl-p-cresol.

[0008] Preferably, the light stabilizer comprises UV-531.

[0009] Preferably, the lubricant comprises talc, calcium stearate or polyethylene wax.

[0010] Preferably, the antistatic agent comprises trimethylammonium chloride or hexadecyltrimethylammonium chloride.

[0011] In a second aspect, the present invention provides a method for preparing the high tensile strength film, comprising the following steps: S10, mixing polypropylene resin, glass fiber, toughening agent, antioxidant, light stabilizer lubricant and antistatic agent to obtain a mixture; S20, melt-extrude the mixture, and stretch it longitudinally and transversely; S30, heat treating and cooling the film stretched in step S30 to obtain a film with high tensile strength.

[0012] The third invention provides an application of the high tensile strength film in the preparation of capacitor electrodes.

[0013] Compared with the prior art, the present invention has the following beneficial effects: The present invention adds glass fiber and toughening agent to the raw materials for preparing the film. The glass fiber reinforced polypropylene film can distribute stress more evenly during the stretching process, avoiding the film from being broken due to local excessive stress during the electroplating process. In addition, the glass fiber reinforced material can increase the heat resistance and rigidity of the film, which is also helpful for the high temperature resistance in the electrophoresis electroplating process. The toughening agent improves the intermolecular interaction of polypropylene and the mobility of the molecular chain, thereby enhancing the ductility of the film and avoiding brittle fracture under the action of external force. This improves the mechanical strength of the film and avoids the film from being easily broken during electrophoresis electroplating. DETAILED DESCRIPTION

[0014] The present invention is further described in detail below in conjunction with specific embodiments so that those skilled in the art can understand the present invention more clearly.

[0015] Example 1 The invention provides a high tensile strength film, which comprises the following raw materials in parts by weight: 80 parts of homopolypropylene, 2 parts of glass fiber, 2 parts of fluororubber, 0.1 parts of tert-butyl-p-cresol, 0.1 parts of UV-531, 0.1 parts of talc powder and 0.1 parts of trimethylammonium chloride.

[0016] The preparation method is as follows: the above raw materials are dried and mixed, and the mixed materials are sent to a twin-screw extruder for melt extrusion. The melt extrusion temperature is controlled at 200°C. The molten polypropylene is extruded through a die to form a film strip, and the thickness of the film is 80μm. Then, after longitudinal and transverse stretching, heat treatment, cooling, surface treatment, winding and cutting, a high tensile strength film is obtained.

[0017] Example 2 The present invention provides a high tensile strength film, comprising the following raw materials in parts by weight: 90 parts of homopolypropylene, 5 parts of glass fiber, 3 parts of fluororubber, 0.3 parts of tert-butyl-p-cresol, 0.2 parts of UV-531, 0.3 parts of talc, and 0.3 parts of trimethylammonium chloride. The preparation method is the same as that of Example 1.

[0018] Example 3 The present invention provides a high tensile strength film, comprising the following raw materials in parts by weight: 95 parts of homopolypropylene, 10 parts of glass fiber, 5 parts of fluororubber, 0.5 parts of tert-butyl-p-cresol, 0.3 parts of UV-531, 0.5 parts of talc, and 0.5 parts of trimethylammonium chloride. The preparation method is the same as that of Example 1.

[0019] Comparative Example 1 The present invention provides a high tensile strength film and a preparation method thereof. The raw materials and the preparation method are the same as those in Example 3, except that the glass fiber and fluororubber are removed.

[0020] Comparative Example 2 The present invention provides a high tensile strength film and a preparation method thereof. The raw materials and the preparation method are the same as those in Example 3, except that the fluororubber is removed.

[0021] Comparative Example 3 The present invention provides a high tensile strength film and a preparation method thereof. The raw materials and the preparation method are the same as those in Example 3, except that the glass fiber is removed.

[0022] Performance testing and results The films prepared in Example 3 and Comparative Examples 1-3 were subjected to a tensile strength test using the test method of GB / T1040.3 "Determination of tensile properties of plastics Part 3: Experimental conditions for films and sheets". The results are shown in Table 1.

[0023] Table 1

[0024] It can be seen from Table 1 that the tensile strength of the film prepared in Example 3 is higher than that of Comparative Examples 1-3. The addition of glass fiber and toughening agent improves the mechanical strength of the film, thereby preventing the film from being easily broken during electrophoretic plating.

[0025] Other raw materials or structures not specifically described in the present invention already exist in the prior art and can be directly purchased from the market.

[0026] The above are only preferred embodiments of the present invention and are not intended to limit the protection scope of the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A high tensile strength film, characterized in that: The invention comprises the following raw materials in parts by weight: 80-95 parts of polypropylene resin; 2-10 parts of glass fiber; 2-5 parts of toughening agent; 0.1-0.5 parts of antioxidants; 0.1-0.3 parts of light stabilizer; 0.1-0.5 parts of lubricant; and, 0.1-0.5 parts of antistatic agent.

2. The high tensile strength film according to claim 1, characterized in that: The polypropylene resin includes homopolypropylene or copolymer polypropylene.

3. The high tensile strength film according to claim 1, characterized in that: The toughening agent includes styrene-butadiene rubber or fluororubber.

4. The high tensile strength film according to claim 1, characterized in that The antioxidant includes tert-butyl-p-cresol.

5. The high tensile strength film according to claim 1, characterized in that: The light stabilizer includes UV-531.

6. The high tensile strength film according to claim 1, characterized in that: The lubricant includes talc, calcium stearate or polyethylene wax.

7. The high tensile strength film according to claim 1, characterized in that The antistatic agent includes trimethylammonium chloride or hexadecyltrimethylammonium chloride.

8. The method for preparing a high tensile strength film according to any one of claims 1 to 7, characterized in that: The following steps are involved: S10, mixing polypropylene resin, glass fiber, toughening agent, antioxidant, light stabilizer lubricant and antistatic agent to obtain a mixture; S20, melt-extrude the mixture, and stretch it longitudinally and transversely; S30, heat treating and cooling the film stretched in step S30 to obtain a film with high tensile strength.

9. Use of the high tensile strength film according to any one of claims 1 to 7 in the preparation of capacitor electrodes.

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