Flexible film with composite coating and preparation method thereof

• Main Authors: TIAN CHUANYONG, LI LILI, YUAN YONGHAO, SHI HAISHENG, SU SHUAIJIE, LI YONGGAN, HUANG XIAOJIN, DU JUNPENG, NIE XIRAN
• Format: Patent
• Language: Chinese; English
• Published: 13.11.2020
• Subjects: BASIC ELECTRIC ELEMENTS; ELECTRICITY; INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIRCHEMICAL OR PHYSICAL PROPERTIES; MEASURING; PHYSICS; PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSIONOF CHEMICAL INTO ELECTRICAL ENERGY; TESTING

The invention discloses a preparation method of a flexible film with a composite coating. The preparation method comprises the following steps: preparing a polyethylene film; performing conventional stretching and then performing two-dimensional stretching; coating a first layer of coating on a film, sputtering a second layer of coating on the film, carrying out softness inspection and preparationprocess control treatment on a polyethylene film with a composite coating, and forming the film, thereby producing the film with proper softness. When the film is used as a lithium battery diaphragm,the coating can be prevented from falling off during transportation, installation and use, the safety is high, and the mechanical property and the electrical property are good. 一种具有复合涂层的柔性膜的制备方法，包括制备聚乙烯薄膜；进行常规拉伸后进行二维拉伸；对薄膜进行第一层涂层涂布，再对薄膜进行第二层涂层溅射，对具有复合涂层的聚乙烯膜进行柔软度检查和制备工艺控制处理后，成膜，从而生产具有适合柔软度的薄膜。利用这样的薄膜作为锂电池隔膜可以防止涂层在运输、安装、使用时脱落，并且安全性高，机械性能、电学性能佳。