High barrier polyethylene film and preparation method thereof

Abstract

The invention discloses a high barrier polyethylene film and a preparation method thereof. The film comprises following components in parts by weight: 50 to 200 parts of polyethylene, 15 to 60 parts of filling material, 2 to 8 parts of plasticizer, and 10 to 20 parts of plastic additive, wherein the filling material is stainless steel based-silver / titanium composite particles. The preparation method comprises following steps: drying polyethylene resin and the filling material, then mixing polyethylene resin, the filling material, the plasticizer, and the plastic additive, carrying out plasticization and homogenization, extruding the melt by an extruding machine, filtering the melt by a filter screen, filling the melt into a mould, forwards pulling the film blank by a casting roller and a cooling roller, carrying out air blowing and longitudinal stretching to obtain a polyethylene film, at the same time, cooling the polyethylene film by a cooling air ring to gradually cure the film, andthen reeling the film by a pulling roller to obtain a bundle. The high barrier polyethylene film is prepared by one-time processing and moulding. The operation difficulty and production cost are reduced. The film can well prevent water or gas, has a certain antibacterial effect, is degradable and environmentally friendly, and can be recovered and reutilized.

Description

technical field [0001] The invention relates to the technical field of polyethylene films, in particular to a high-barrier polyethylene film and a preparation method thereof. Background technique [0002] In recent years, high-barrier film materials have been widely used in the market for food, medicine, chemical and other product packaging, electronics, etc. Device packaging and fuel cell diaphragm and other fields are developing rapidly. Excellent barrier properties are an important characteristic of high barrier film materials, including good gas barrier properties, moisture barrier properties, oil barrier properties, and fragrance retention properties. Early barrier film materials were represented by ethylene-vinyl alcohol copolymer (EVOH), polyamide (PA), polyvinylidene chloride (PVDC), polyvinyl alcohol (PVA) and other films, but with the development of food and beverage, medical, Driven by the strong demand for products in the fields of chemicals and daily necessiti...

AI Technical Summary

Problems solved by technology

For example, the film prepared by adding ethylene-vinyl alcohol copolymer (EVOH), because the barrier property of EVOH is greatly affected by the environment, when the humidity is >60%, its barrier performance will be significantly reduced, and it can only be used in a dry environment; Films made of vinylidene chloride (PVDC) have the characteristics of flame resistance and corrosion resistance, but polyvinylidene chloride (PVDC) has strong polarity, is insoluble in common solvents at room temperature, has poor light and thermal stability, and is difficult to prepare films. Large; the film prepared by adding polyvinyl alcohol (PVA) has poor water resistance. In the case of moisture absorption or water absorption, adhesion between films is easy to occur, and it has the effect of water absorption and swelling

Moreover, the preparation process of high-barrier films usually adopts methods such as coating compounding and vacuum aluminum plating, but the coating process has high requirements for the base layer, requiring high flatness and smoothness of the base layer, and the amount of coating used for coating is difficult. Control, and the cost is high, the process is complicated, etc.; while the vacuum aluminum plating process, there will be coating scratches, obvious scratches, warped edges, and the shortcomings of coating peeling off