On-line coating low-stripping-force polyester release film and preparation method thereof

Abstract

The invention relates to an on-line coating low-stripping-force polyester release film which comprises a polyester base film and a release coating coating surface of one side of the polyester base film. The polyester base film is composed of film-grade polyester resin, fluorine-containing polyester resin and antistatic polyester resin, the weight percentage of each component is as follows: 80-90% of film-grade polyester resin, 5-10% of fluorine-containing polyester resin and 5-10% of antistatic polyester resin; the polyester base film is of a single-layer structure and is prepared through melt extrusion and two-way stretching, and the thickness of the polyester base film is 20-60 micrometers. The release coating is formed by coating release coating liquid and carrying out baking and curing treatment, and the thickness of the release coating is 1-5 microns. The on-line coating low-stripping-force polyester release film provided by the invention is prepared through the processes of release coating liquid and base film preparation, single-layer extrusion, coating curing and the like, has the characteristics of low stripping force, stable release force, heat resistance, antifouling property and the like, and can meet the use requirements of packaging labels such as adhesive labels, electronic labels, bar codes and the like in the industries of electronics, medicines, daily chemicals, foods and the like.

Description

technical field [0001] The invention relates to the field of release films, in particular to an online coated low-peeling force polyester release film and a preparation method thereof. Background technique [0002] Release film, also known as peeling film, anti-adhesive film, peeling film, isolation film, separation film, etc., refers to a film with a separable surface. The release film has the advantages of high hydrophobicity, low peeling force and good residual adhesion rate, etc., and it has no stickiness or slight stickiness after contacting with specific materials. At present, the release film is widely used in the packaging and labeling of self-adhesive labels, electronic supervision codes, barcodes, etc. in food, medicine, electronics, daily chemicals, toys and other industries. As a supporting high-speed labeling machine, silicon-coated release film requires low peeling force, stable peeling force, and small fluctuations in order to adapt to the stringent requireme...

AI Technical Summary

Problems solved by technology

The release film produced by off-line coating usually requires plasma or corona treatment on the surface of the film, which has high production costs, and the residual adhesion rate of the product is generally lower than 87%, which is prone to the problem of detachment of silicone coating materials. Coating can solve the above problems

Compared with offline coating, the production cost of the release film produced by online coating is low, the residual bonding rate is as high as 95%, and the problem of silicone coating detachment does not occur, but there is a high peeling force and the film surface is easy to peel off after peeling. There are problems of crystal points, mottling and lines, and it is difficult to meet the high-speed labeling requirements of the labeling machine

Images