Release film with silicon dioxide film layer and preparation method of release film

Abstract

The invention provides a release film with a silicon dioxide coating and a preparation method of the release film. The preparation method comprises the following steps: (1) preparing a polysilazane solution; (2) coating one surface or two surfaces of a PET film with the polysilazane solution, expelling a solvent, and drying, wherein the drying thickness of a polysilazane coating is 20-200nm; an (3) carrying out heat-moisture treatment on the product obtained from the step (2) in a drying oven of which the relative humidity is 85% and the temperature is 85 DEG C for 2-3 hours, and drying at 120-150 DEG C for 1-2 hours, so as to obtain the release film with the silicon dioxide coating. The silicon dioxide (SiO2) film is compact in structure, smooth in surface, and small in binding force with epoxy resin and the like, and thus the release effect can be achieved. In addition, the silicon dioxide (SiO2) film is generated by reaction of the polysilazane solution; the binding force of an inner layer and the film is good; a smooth compact layer is formed on the outer layer, and is weak in binding force with common epoxy; meanwhile, the problems of coating leakage and the like can be solved in the solution coating process, and thus the overall release effect can be achieved.

Description

technical field [0001] The invention relates to the technical field of release films, in particular to a release film with a silicon dioxide film layer and a preparation method thereof. Background technique [0002] The release film refers to a film with a separable surface. The release film is not sticky or slightly sticky after being in contact with a specific material under limited conditions. Usually, in order to increase the release force of the plastic film, the plastic film will be treated with plasma, or coated with fluorine, or coated with silicone (silicone) release agent on the surface of the film material, such as PET, PE, OPP, etc. etc.; it can show extremely light and stable release force for various organic pressure-sensitive adhesives, such as hot-melt adhesives, acrylic adhesives and rubber-based pressure-sensitive adhesives. According to the required release force of the release film, the viscosity of the isolation product adhesive is different, and the re...

AI Technical Summary

Problems solved by technology

In general, the release film is attached to the corresponding material for early protection. When the release film is torn off during use, the following disadvantages usually occur: the silicone release agent on the surface of the release film migrates into the contact material, causing contact The binding force between the surface of the material and other materials is reduced

[0004] In order to solve the problem of organosilicon release agent migration and contact materials, companies such as Dupont have introduced fluorine-containing release films (such as PTFE films). Although this film can solve this problem, the price is very expensive, and the used fluorine-containing film ( PTFE, etc.) bring secondary pollution to the environment, it is not easy to decompose, and cannot be recycled and reused

Most other release film manufacturers use silicone oil and other silicone release agents to coat the surface of PE and other films, which can also achieve routine effects, and the cost and price are relatively low, but serious quality problems often occur. That is, the silicone release agent falls off and remains on the surface of the insulating board, resulting in quality problems such as decreased adhesion of the insulating board during PCB processing

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