Smooth coating liquid for aluminum plastic thin film and coating process thereof

Abstract

The invention provides smooth coating liquid for an aluminum plastic thin film and a coating process thereof. The coating liquid is prepared from ion-molecular weight organosiloxane, a flatting agent,organic silicon resin, an organic solvent and water. The smooth coating liquid for the aluminum plastic thin film provided by the invention has a favorable effect on remarkably reducing a friction coefficient of a nylon membrane so as to enable a dynamic friction coefficient to be smaller than 0.30; and can be further used for reducing a friction coefficient of a polypropylene thin film so as toenable a dynamic friction coefficient to be smaller than 0.30. The coating process is characterized by coating double surfaces at the same time, and the coating sequence is firstly coating the polypropylene thin film surface and then coating a polyamide thin film surface. The coating process of the smooth coating liquid is simple, no curing is needed, low-temperature drying can be carried out, theproduction efficiency can be effectively improved, and the economic cost can be effectively saved. After an aluminum plastic film product is coated with the smooth coating liquid, a scouring depth performance can be improved, and the stability of the friction coefficient at the high temperature is ensured at the same time.

Description

technical field [0001] The invention relates to the field of lithium battery packaging materials, in particular to a smooth coating liquid for aluminum-plastic films and a coating process thereof. Background technique [0002] At present, lithium-ion battery technology is becoming more and more mature, and it is widely used in 3C electronic products, power batteries, and energy storage. Among them, the amount of aluminum-plastic film products used in soft bags is also increasing. In order to improve the drawing performance of the aluminum-plastic film, it is necessary to increase the friction coefficient of the surface of the aluminum-plastic film. In the patent CN105453299B, the amide slip agent is added into the sealing layer by internal addition. If the amount of this addition is not well controlled, the slip agent will precipitate excessively on the surface, and white powder will be produced on the forming surface of the drawing die (slip agent accumulation formation). ...

AI Technical Summary

Problems solved by technology

Japanese Patent Application Laid-Open No. 2002-216713 and Japanese Patent Application No. 2002-216714 propose an outer packaging material that is formed by coating or spraying a fatty acid amide-based slip agent on at least the surface of the substrate layer. Not good, there is still the risk of powder dropping, and there is also the problem of migration into the film. With the extension of time, the friction coefficient will gradually increase, resulting in poor drawing performance of the product

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