Polypropylene film as well as preparation method and application thereof
By adding surface modifiers and plasticizers to the raw materials of the polypropylene film, the problem of insufficient mechanical strength during the electrophoretic electroplating process is solved, and the mechanical strength of the film is improved and the stable combination of the electroplating layer is achieved.
Patent Information
- Application Number
- CN202411968685.9
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2024-12-30
- Publication Date
- 2025-04-11
AI Technical Summary
The existing polypropylene films are insufficient in the electrophoretic electroplating process and are prone to fracture.
By adding surface modifiers and plasticizers to the raw materials of the polypropylene film, the ductility and polarity of the film are improved, thereby enhancing mechanical strength. Specific methods include mixing polypropylene, surface modifier, plasticizer, antioxidant and flame retardant and melt extruding, and performing longitudinal and transverse stretching, heat treatment and cooling.
The mechanical strength of the polypropylene film is improved, the film breakage is avoided during electrophoretic plating, and the good combination of the electroplating layer and the film is ensured.
Smart Images
Figure SMS_1
Abstract
Description
Technical Field
[0001] The invention belongs to the technical field of polypropylene films, and in particular relates to a polypropylene film and a preparation method and application thereof. Background Art
[0002] Polypropylene itself is a good electrical insulator, but capacitors require good electrical conductivity as an electrode material. Electrophoretic plating provides high conductivity by forming a thin layer of metal (usually aluminum) on the surface of the film, allowing it to work as a capacitor electrode. Due to the low mechanical strength of current polypropylene films, the film is prone to breakage during electrophoretic plating. Summary of the invention
[0003] In view of the deficiencies in the prior art, the present invention provides a polypropylene film and a preparation method and application thereof, which improve the mechanical strength of the film and avoid the film 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 polypropylene film comprising the following raw materials in parts by weight: 90-98 parts of polypropylene, 0.5-3 parts of a surface modifier, 1-5 parts of a plasticizer, 0.1-1 parts of an antioxidant, and 0.1-1 parts of a flame retardant.
[0005] Preferably, the raw materials include the following parts by weight: 98 parts of polypropylene, 3 parts of surface modifier, 5 parts plasticizer, 1 part antioxidant and 1 part flame retardant.
[0006] Preferably, the surface modifier comprises aminosilane or epoxysilane.
[0007] Preferably, the plasticizer comprises a phthalate.
[0008] Preferably, the antioxidant comprises BHT.
[0009] Preferably, the flame retardant comprises chlorinated polypropylene or a brominated flame retardant.
[0010] In a second aspect, the present invention provides a method for preparing the polypropylene film, comprising the following steps: S10, mixing polypropylene, a surface modifier, a plasticizer, an antioxidant, and a flame retardant 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 polypropylene film.
[0011] Preferably, in step S20, the temperature of the melt extrusion is 200-250°C.
[0012] In a third aspect, the present invention provides a use of the polypropylene film in preparing capacitor electrodes.
[0013] Compared with the prior art, the present invention has the following beneficial effects: The present invention adds a surface modifier and a plasticizer to the raw materials for preparing the film, wherein the plasticizer can increase the ductility of polypropylene, and the surface modifier can improve the polarity and surface roughness of the polypropylene film, thereby increasing the bonding force between the electroplating layer and the film, thereby increasing the mechanical strength of the film and preventing the film from being easily broken during electrophoresis plating. 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 polypropylene film, which comprises the following raw materials in parts by weight: 90 parts of polypropylene, 0.5 parts of epoxy silane, 1 part of phthalate, 0.1 parts of BHT and 0.1 parts of chlorinated polypropylene.
[0016] Preparation method: 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 with a thickness of 80μm. Then, after longitudinal and transverse stretching, heat treatment, cooling, surface treatment, winding and cutting, a polypropylene film is obtained.
[0017] Example 2 The present invention provides a polypropylene film, comprising the following raw materials in parts by weight: 95 parts of polypropylene, 2 parts of epoxy silane, 3 parts of phthalate, 0.5 parts of BHT, and 0.5 parts of chlorinated polypropylene. The preparation method is the same as that of Example 1.
[0018] Example 3 The present invention provides a polypropylene film, comprising the following raw materials in parts by weight: 98 parts of polypropylene, 3 parts of epoxy silane, 5 parts of phthalate, 1 part of BHT, and 1 part of chlorinated polypropylene. The preparation method is the same as that of Example 1.
[0019] Comparative Example 1 The present invention provides a polypropylene film and a preparation method thereof. The raw materials and the preparation method are the same as those in Example 3, except that epoxy silane and phthalate are not added.
[0020] Comparative Example 2 The present invention provides a polypropylene film and a preparation method thereof. The raw materials and the preparation method are the same as those in Example 3, except that no phthalate is added.
[0021] Comparative Example 3 The present invention provides a polypropylene film and a preparation method thereof. The raw materials and the preparation method are the same as those in Example 3, except that epoxy silane is not added.
[0022] Performance testing and results The polypropylene films prepared in Example 3 and Comparative Examples 1-3 were subjected to tensile strength tests using the test method in accordance with GB / T 1040.3 “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 surfactants and plasticizers 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 polypropylene film, characterized in that The invention comprises the following raw materials in parts by weight: 90-98 parts of polypropylene; 0.5-3 parts of surface modifier; 1-5 parts of plasticizer; 0.1-1 parts of antioxidants; and, 0.1-1 part flame retardant.
2. The polypropylene film according to claim 1, characterized in that The invention comprises the following raw materials in parts by weight: 98 parts of polypropylene; 3 parts of surface modifier; 5 parts plasticizer; 1 part antioxidant; and, 1 part flame retardant.
3. The polypropylene film according to claim 1, characterized in that The surface modifier includes aminosilane or epoxysilane.
4. The polypropylene film according to claim 1, characterized in that The plasticizers include phthalates.
5. The polypropylene film according to claim 1, characterized in that The antioxidant includes BHT.
6. The polypropylene film according to claim 1, characterized in that The flame retardant includes chlorinated polypropylene or brominated flame retardant.
7. The method for preparing a polypropylene film according to any one of claims 1 to 6, characterized in that: The following steps are involved: S10, mixing polypropylene, a surface modifier, a plasticizer, an antioxidant, and a flame retardant 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 polypropylene film.
8. The preparation method according to claim 7, characterized in that: In step S20, the temperature of the melt extrusion is 200-250°C.
9. Use of the polypropylene film according to any one of claims 1 to 6 in the preparation of capacitor electrodes.