Preparation method of novel material for single-layer ultra-low temperature packaging

Abstract

The invention discloses a preparation method of a novel material for single-layer ultra-low temperature packaging, comprising raw materials of polypropylene resins and master batch, wherein the masterbatch is prepared from the following components in parts by weight: 70 to 80 parts of ternary co-polypropylene, 6 to 8 parts of nanofibers, 4 to 6 parts of anti-adhesive agents, 2 to 4 parts of dimethicone, 0.6 to 0.8 part of ultraviolet light absorber, 0.1 to 0.3 part of antioxidant, 0.08 to 0.1 part of visible light regulator, 0.4 to 0.6 part of silicone slip agent, 0.6 to 0.8 part of processing modifier, and 0.6 to 0.8 part of antistatic masterbatch. The silicone slip agent used has a molecular weight of 50 to 1.2 million, has no influence on the adhesion of an aluminized layer, and has the characteristics of ultra-low heat sealing temperature, low friction coefficient and stable performance, and at the same time, the heat sealing temperature of a product is greatly reduced, so that the startup speed of a packaging machine is increased and production efficiency is increased.

Description

technical field [0001] The invention relates to the technical field of packaging materials, in particular to a method for preparing a novel material for single-layer ultra-low temperature packaging. Background technique [0002] Ordinary CPP aluminized film packaging bags are prone to quality problems such as delamination and oxidation in an environment with relatively high humidity, resulting in a short shelf life of the items in the package, or even premature deterioration, especially for food, which cannot meet the quality of the package. Require. At present, the adhesion of the aluminum layer of the ordinary unstretched cast polypropylene film in China is below 0.6 Newton, and the adhesion of the aluminum layer is not high. There will be a large surface peeling phenomenon of the aluminum layer. [0003] At present, the domestic packaging industry generally stays in the knowledge and understanding of the aluminum layer transfer after the aluminized film is laminated. t...

AI Technical Summary

Problems solved by technology

For example: Plasma treatment before aluminum plating to improve the bonding force between the unstretched cast polypropylene corona surface and the aluminum layer; when compounding, use a slightly larger molecular weight adhesive carrier or use a special adhesive for aluminized film, and appropriate Reduce the proportion of curing agent, reduce the amount of glue, increase the curing temperature, shorten the curing time, reduce the unwinding tension and other processes to reduce the damage to the aluminum layer of the unstretched cast polypropylene aluminized film, reduce the transfer of the aluminum layer and improve the peeling force etc.; but these methods have little effect, so that the composite peel strength of the final product has not been fundamentally obtained.

At the same time, ordinary CPP aluminized film needs about 120 degrees Celsius to seal normally when sealing, the sealing speed is slow, and the bag breaking rate is relatively high