Method for preparing polyethylene type adhesive resin for multilayer co-extrusion barrier package

Abstract

The invention discloses a polyethylene type adhesive resin for multilayer co-extrusion barrier package. The polyethylene type adhesive resin comprises the following formula raw materials in percentage by weight: 40-80 percent of high density polyethylene (HDPE), 10-30 percent of functionalization modified high density polyethylene, 15-30 percent of vinyl elastomer, 1-10 percent of ethylene vinyl acetate copolymer (EVA), 0.01-1 percent of hot oxygen stabilizer. The polyethylene type adhesive resin is prepared by the following steps: performing a plasticizing and blending process by adopting a twin-screw extruder, extruding, and granulating, thereby obtaining the product. The adhesive resin disclosed by the invention is used for an adhesive layer of a polyethylene (PE)/nylon (PA) or polyethylene (PE)/ethylene-vinyl alcohol copolymer (EVOH) multilayer co-extrusion barrier package film (sheet) and is excellent in processability, high in transparency, high in heat resistance and fewer in grain points, is particularly excellent in adhesive performance, and a good adhesive layer material is provided for the field of polyethylene type multilayer co-extrusion barrier package.

Description

technical field [0001] The invention belongs to the field of polymer functional materials, relates to the technical field of hot-melt adhesives, in particular to a preparation method of polyethylene-type adhesive resin for multi-layer co-extruded barrier packaging, which is mainly used as polyethylene (PE) / nylon (PA) Or the adhesive layer of polyethylene (PE) / ethylene-vinyl alcohol copolymer (EVOH) multilayer co-extruded barrier packaging film (sheet). Background technique [0002] In recent years, the proportion of plastic packaging materials replacing traditional packaging materials has been growing rapidly, and high value-added functional plastic packaging materials represented by multi-layer co-extruded barrier functional films (sheets) are increasingly being received by the packaging industry and food favored by the industry. [0003] Multi-layer co-extrusion technology refers to directly using more than three kinds of plastic particles (or powder) as raw materials, an...

AI Technical Summary

Problems solved by technology

When the bonding strength is not enough, the co-extruded film will delaminate during the production of multi-layer co-extruded film or when stretched and packaged by vacuum, which seriously affects product quality and production efficiency

At present, when using polypropylene multi-layer co-extruded film or polyethylene multi-layer co-extruded film to package angular products (such as trotters, beef steaks, and electronic printed circuit boards, etc.), the angularity of the corners will be reduced during the vacuum stretching process. Delamination often occurs at the edge, indicating that the bonding strength of the adhesive resin at the edge of the edge is severely reduced or lost due to the relative excessive tensile stress and strain between the layers during vacuum stretching. Therefore, in the prior art The use of polypropylene-type bonding resins and polyethylene-type bonding resins imposes higher requirements

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