Biaxially oriented polyethylene-based film with high surface energy

Abstract

The invention relates to a biaxially oriented polyethylene base film with high surface energy, which is prepared from the following at least five layers of structures through co-extrusion and biaxially oriented stretching processes: the five layers of structures sequentially comprise an outer layer, a hook chain layer, a main stretching layer, a transition layer and an inner layer in the thickness direction of the base film, the outer layer is a high-surface-energy layer, and the inner layer is a high-surface-energy layer; the high surface adhesive force between the base film and other films or layers can be improved in a chemical bond mode, and the hook chain layer is transition of polarity and compatibility between the main stretching layer and an outer layer material. The main stretching layer is a functional layer undertaking a main stretching task in a two-way stretching processing process; the transition layer is used for transition of melting temperature between the main stretching layer and the inner layer material; and the inner layer is a heat sealing layer. The base film with high surface energy is obtained by endowing the surface layer with polarity, so that the high adhesive force of the surface of the PE base material is realized. Through the design that the weight of the polyethylene is greater than or equal to 90% of the total weight of the base film, the environment-friendly requirements that the product is easy to recover and recycle are met.

Description

technical field [0001] The invention relates to the field of polyethylene film, in particular to a biaxially stretched polyethylene base film with high surface energy. The surface energy of this polyethylene-based film can reach 38 dynes / cm and above. Background technique [0002] The difficulty of recycling waste plastics, especially functional flexible packaging, is an urgent problem of global concern. The design concept of high barrier functional single material is the preferred direction for the development of new flexible packaging materials in the world. [0003] Commercially available high-barrier functionalized films usually use polyester film as the base film, and use the good polarity of polyester materials to meet the sufficient adhesion and durability of the base film and barrier coating and barrier evaporation layer to obtain stable Precise, controllable, long-lasting barrier properties. [0004] Polyethylene is a non-polar material with low surface energy, h...

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