Self-adhesive protective film and preparation method thereof

Abstract

The invention belongs to the technical field of high polymer materials and discloses a self-adhesive protective film and a preparation method thereof. The self-adhesive protective film comprises a viscous layer, a sandwich layer and an outer surface layer which are sequentially in contact with one another, wherein the viscous layer is a Kraton viscous copolymer layer; the sandwich layer comprises one or more of PE, PP or a PE-PP copolymer; and the outer surface layer comprises one or more of PP, HDPE, LDPE, LLDPE or an LDPE-HDPE copolymer. The self-adhesive protective film is wide in viscosity and stripping strength adjustment range, has stable viscosity on polar or non-polar surfaces, and shows very good stability under a high-temperature condition. The preparation method of the self-adhesive protective film comprises the following steps: uniformly mixing the raw materials of the viscous layer, the sandwich layer and the outer surface layer by weight ratio, then sending the obtained mixture to a three-layered coextrusion film-blowing unit for extrusion film-blowing, and performing cooling. The one-step coextrusion process is adopted, so that the operation is simple and easy, the running efficiency is high, the loss is small, and the product quality is good in stability.

Description

technical field [0001] The invention belongs to the technical field of polymer materials, and in particular relates to a self-adhesive protective film and a preparation method thereof. Background technique [0002] Protective film can be divided into digital product protective film, car protective film, household protective film, food fresh-keeping protective film, etc. according to the purpose. It is widely used in various fields such as home furnishing, building materials, food, medicine, chemical industry, etc. , storage and transportation to achieve the purpose of protecting the product. [0003] At present, the protective film attached to the product is mostly achieved by coating the base layer of the protective film with glue. However, these glues usually contain organic solvents, which will produce pungent odors, and generally require secondary baking. Only processing can remove the organic solvent, so it causes an increase in cost and does not meet the requirements ...

AI Technical Summary

Problems solved by technology

For example, Chinese patent CN104527187 discloses a self-adhesive protective film and its preparation method, which is composed of an outer film, a middle film and an inner film, and the main raw materials of the outer film and the middle film are metallocene polyethylene, low density Polyethylene or linear low-density polyethylene, the main component of the inner film is Dow Chemical Elastomer, but it needs to ensure different temperatures in different material cavities during preparation, the operation is cumbersome, and it is not suitable for large-scale industrial applications