Preparation method of microporous membrane
A technology of microporous film and film, which is applied in the field of preparation of microporous film by dry method, can solve the problems of long production process time, inability to reduce production cost, and inability to further improve industrial production efficiency, so as to shorten the time and reduce the process The effect of the steps
- Summary
- Abstract
- Description
- Claims
- Application Information
AI Technical Summary
Problems solved by technology
Method used
Image
Examples
preparation example Construction
[0022] Please refer again image 3 , image 3 It is a flow chart of the steps of the preparation method of the microporous film according to the second embodiment of the present invention. As shown in step S21, the preparation raw materials are fed into the extruder to prepare the raw film. Then, step S22 is performed, that is, the raw film prepared in step S21 is annealed. Next, it is different from the preparation method of the microporous film in the first embodiment of the present invention. Step S23 of this embodiment is to cold-stretch the film that has been annealed in step S22. Then proceed to step S24, immersing the cold-stretched film in step S23 into the modifying solution. Finally, step S25 is performed, and the film immersed in the modifying solution in step S24 is taken out from the modifying solution and subjected to thermal stretching. It should be noted that, compared with the first embodiment, this embodiment does not require the modification temperature...
Embodiment A
[0037] Using polypropylene with a melt index of 1.9g / min and a molecular weight of about 400,000, the crystallinity of polypropylene is 56%, and the original film is extruded through a conical twin-screw extruder. The die gap of the extruder is 3.0mm, and the extrusion temperature The temperature is 210°C, and the winding device is connected to roll the film. The thickness of the film is 18um. The raw film was placed in a drying oven and annealed at 140° C. for 10 min. Then immerse the annealed film in the tank body containing the modified solution of aliphatic amine cationic surfactant for cold stretching, and adopt the method of roller stretching to carry out uniaxial stretching, and the stretching ratio of cold stretching is 20%, and the upper and lower surfaces of the film are rolled by rollers, and the temperature of the tank body is set at 20°C. Then, the above-mentioned cold-stretched film immersed in the modifying solution is taken out from the modifying solution, and...
Embodiment B
[0039] Using polypropylene with a melt index of 1.9g / min and a molecular weight of about 400,000, the crystallinity of polypropylene is 56%, and the original film is extruded through a conical twin-screw extruder. The die gap of the extruder is 3.0mm, and the extrusion temperature The temperature is 210°C, and the winding device is connected to roll the film. The thickness of the film is 18um. The raw film was placed in a drying oven and annealed at 140° C. for 10 min. Then the annealed film was cold-stretched, and uniaxially stretched by a roller stretching method. The temperature of the cold stretching was set at 20° C., and the stretching ratio of the cold stretching was 20%. Then immerse the cold-stretched film into a tank containing a modified solution of aliphatic amine cationic surfactant, and use rollers to roll the upper and lower surfaces of the film. The temperature of the tank is set at 20°C. Then, take the film immersed in the modifying solution out of the modify...
PUM
| Property | Measurement | Unit |
|---|---|---|
| pore size | aaaaa | aaaaa |
| melt flow index | aaaaa | aaaaa |
| crystallinity | aaaaa | aaaaa |
Abstract
Description
Claims
Application Information
Login to View More