Preparation process of composite packing film with very high oxygen inhibition and boiling resistance performance

Abstract

The invention discloses a preparation method of a composite film with ultra-high oxygen resistance and retort resistance for packaging, which uses corona-treated polyethylene film, polypropylene film, polyester film and nylon film as base materials, and coats a layer of high resistance Oxygen glue aqueous solution can be dried to obtain ultra-high oxygen resistance and retort-resistant film, and can also be compounded with one of PE, PP or BOPP to obtain multi-layer ultra-high oxygen resistance and retort-resistant composite film. The multilayer composite film prepared by the preparation method of the present invention has excellent barrier properties to oxygen, nitrogen, hydrogen and carbon dioxide, low production cost, superior performance, high oxygen barrier performance under high humidity, and good moisture resistance , At the same time, it can effectively reduce the thickness of the packaging layer, which is conducive to promoting the lightweight and thin-walled packaging.

Description

technical field [0001] The invention relates to the field of soft packaging for foods and liquids, and in particular to a preparation method of a composite film with ultra-high oxygen resistance, retort resistance and packaging. Background technique [0002] With the continuous improvement of people's living standards, higher requirements are put forward for the preservation and nutritional value of food. In order to meet people's requirements for food types and nutrition, food circulation around the world has increased, and correspondingly, food storage and shelf life requirements have also been extended. Therefore, the food processing industry has higher barrier requirements for food packaging films to ensure the fresh taste and quality of food. The packaging of items in some special industries also requires very high barrier flexible packaging, such as medicine and medical supplies. At the same time, from the perspective of packaging environmental protection, high-barri...

AI Technical Summary

Problems solved by technology

Because the metal layer (aluminum foil) contained in these packaging materials is not easy to degrade, and the aluminum foil in the composite material is currently unable to be separated in China, the result is that the waste of composite materials with paper-plastic-aluminum structure and composite materials with plastic-aluminum structure cannot be recycled. Utilization, but cannot be incinerated, which is extremely harmful to the protection of the environment

[0008] 2. Aluminized film: the folding resistance is better than aluminum foil, the barrier performance can be close to that of aluminum foil, it can block ultraviolet rays, and the cost of aluminized processing is low; its disadvantages are opacity and poor coating strength (the aluminum layer is easy to fall off automatically after being exposed to water) , not for microwave heating

[0009] 3. Ethylene-vinyl alcohol copolymer (EVOH) five-layer co-extruded film: has excellent barrier properties, has excellent oil resistance and organic solvent resistance, antistatic properties, can be recycled, and only produces CO when incinerated 2 and H 2 O, is an excellent green packaging material; but when the ambient humidity exceeds 50%, its barrier performance deteriorates sharply, so it should not be used alone

Because the investment in imported EVOH resin and imported multi-layer co-extrusion equipment is very expensive, resulting in high product costs

[0010] 4. Polyvinylidene chloride (PVDC) coating film: it has good performance of blocking oxygen and water vapor at the same time, the coating can be heat-sealed, and the cost is low; but the film coating requires special equipment and cannot be melted and granulated Recycling, when the waste is incinerated, it will produce hydrogen chloride, dioxin and other toxic and harmful substances to humans and the surrounding environment

[0011] 5. Silicon oxide film and aluminum oxide film: good transparency, excellent oxygen barrier, moisture barrier and other properties, but due to the extremely expensive equipment investment and the high difficulty of processing technology, the product cost is extremely high

At present, there is no unit production in China, and there are very few products imported from abroad.