High-viscosity self-adhesion protective film and preparation method thereof

Abstract

The invention discloses a high-viscosity self-adhesion protective film and a preparation method thereof. The high-viscosity self-adhesion protective film comprises four layers, i.e. an A outer layer, a B middle layer, a C middle layer and a D inner layer; raw materials of four layers mainly comprise linear low density polyethylene, metallocene and SEBS; in the preparation method, a high-speed running pressure box is adopted, a mode of multiple groups of extrusion screws is adopted, and after raw materials are in a high-temperature molten state, repeated multilayer filtration is adopted by a candle-type screen changer. The protective film disclosed by the invention has high self-adhesion, high stability and a wide application range, is more transparent in film appearance, has fewer film surface fish eye phenomena, has a mush higher physical property than a conventional self-adhesion protective film, is easy to adhere and easy to tear, has a more prominent protective effect, is low in cost, is simple in process, and is energy-saving and environmental-friendly.

Description

technical field [0001] The invention relates to an adhesive film, in particular to a new generation of environment-friendly high-adhesive self-adhesive protective film with low production cost, high and stable self-adhesive property and small crystal point and a preparation method thereof. Background technique [0002] Adhesive films for the purpose of protecting the surface of coverings have been used in the processing, storage, and transportation of building materials, electrical, electronic products, and automobiles. Such adhesive films must have good adhesion and be used in It can be easily peeled off after use without contaminating the surfaces with the adhesive. [0003] The self-adhesive protective films currently available on the market are mostly low-viscosity and medium-high-viscosity protective films. Medium and high viscosity protective films mostly use imported raw materials, and the equipment includes blow molding and casting methods. The production cost is re...

AI Technical Summary

Problems solved by technology

Medium and high-viscosity protective films mostly use imported raw materials. The equipment includes blow molding and casting methods. The production cost is relatively expensive, and the product quality has broken molecular chains of raw materials, resulting in fish patterns and small crystal points.

The traditional production method makes the self-viscosity of the product unstable, especially the influence of environmental temperature changes is very prominent

[0004] Publication No. CN104220548A discloses a self-adhesive surface protective film and a self-adhesive surface protective film disclosed by CN104685017A. The above two protective films are mainly composed of a substrate layer, an adhesive layer and a release layer. Layer composition, the adhesive layer contains 35 parts -99 parts of styrene-based elastomer (hydrogenated block copolymer of styrene-based polymer block and butadiene-based polymer block, or with styrene hydrogenated block copolymers of polymer blocks and random copolymer blocks of styrene and butadiene, the polyethylene-based resins being ethylene homopolymers and / or ethylene-alpha olefin copolymers) and The main feature of 1-65 parts polyethylene resin is that its raw material ratio and coefficient are different. Its preparation method is mainly conventional extrusion casting, and the production cost is high.

The publication number is CN104527187A, which discloses a self-adhesive protective film and its preparation method. It is mainly composed of D inner film, middle film and inner film. The main raw material of D inner film and middle film is metallocene polyethylene, low Density polyethylene or linear low density polyethylene, the inner film is mainly Dow chemical elastomer, in its preparation method, the extrusion blown film process is adopted, and the cost is high

[0005] To sum up, although the current high-viscosity self-adhesive protective films have different components, they all adopt blow molding and casting methods, which increase the production cost, and the self-adhesiveness is unstable and affected by environmental temperature changes. Big