Five-layer co-extrusion packaging material having high moisture barrier and barrier properties and preparation method thereof

Abstract

The invention provides a multi-layer co-extrusion packaging material having high moisture barrier and barrier properties and a preparation method of the multi-layer co-extrusion packaging material; and the five-layer co-extrusion packaging material disclosed by the invention comprises a polyethylene layer having high intensity and good adaptation as the first layer, a barrier layer as the second layer, an ultra-fine and ultra-strong water absorbent modified polyethylene layer as the third layer, a barrier layer as the fourth layer and a high-speed thermal sealing layer having excellent chemical stability as the fifth layer, wherein various layers are contacted with each other in sequence. In the multi-layer co-extrusion packaging material having high moisture barrier and barrier properties disclosed by the invention, the ultra-fine and ultra-strong water absorbent modified polyethylene layer has the strong function of absorbing moisture; other layers respectively have good barrier, thermal sealing and printable properties; in addition, by means of reasonable structural design and material selection, various layers have excellent packaging material having high moisture barrier and barrier properties. The five-layer co-extrusion packaging material disclosed by the invention has excellent moisture barrier property; simultaneously, other barrier properties (barrier of oxygen, nitrogen and the like) are also excellent; furthermore, the cost can be effectively reduced; and the processing technique is simple.

Description

Technical field [0001] [0002] The present invention is the field of packaging material technology, especially involving a high -dampness and high -resistance five -layer co -squeezed packaging materials and their preparation methods. Background technique [0003] With the advancement of chemical technology, the functional development trend of plastic packaging film is becoming increasingly obvious. Among them, high -resistance plastic packaging film is one of the fastest -developed function thin films.High -resistant diaphragm refers to the protection of packaging content to avoid the infiltration of small molecular substances such as pollutants and oxygen, water vapor, liquid and odor, and can also prevent packaging films from the infiltration of packaging content.The high resistance of high -resistance membrane refers to the amount of oxygen through a standard state with a temperature of 23 ° C and a relative humidity of 65%. 2 · Below Day, the amount of water steam is <2g...

AI Technical Summary

Problems solved by technology

Among them, ethylene-vinyl alcohol copolymer, polyethylene terephthalate, and crystalline polyamide, as a high-performance barrier packaging material, also have certain shortcomings, mainly because the barrier properties of their products will have a certain degree of humidity. The range has declined, and the current chemical and physical modifications to these materials have not achieved good results in this regard.

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