Production method for high-adhesion high-surface-tension CPP aluminum-plating film

Abstract

The invention discloses a production method for a high-adhesion high-surface-tension CPP aluminum-plating film. The high-adhesion high-surface-tension CPP aluminum-plating film comprises a corona layer comprising 92-94% of ternary polypropylene randon copolymer, 4.5-5.5% of an anti-sticking agent and 1.5-2.5% of zeolite master batch, a core layer comprising 100% of ternary co-polypropylene, a heat-seal layer comprising 92.9-93.9% of homo-polypropylene, 3% of an anti-sticking agent, 2.5-3.5% of a slipping agent and 0.6% of an antistatic agent. The production method comprises the following steps: preparing materials, mixing, plastifying, molding, performing sheet casting, measuring thickness, performing corona, rolling, curing and plating aluminum. According to the production method disclosed by the invention, the corona layer selects polypropylene randon copolymer as a main material which is matched with the anti-sticking agent in specific proportion, and the core layer only adopts the ternary polypropylene randon copolymer as the raw material, so that an aluminum plating layer cannot drop easily; a certain amount of natural zeolite powder is added into the corona layer, so that parts of low-molecule polymers are prevented from rushing out of a surface layer, the aluminum-plating layer can be kept in relatively high in surface tension; meanwhile, no precipitate is separated out of the core layer in a reaction process, so that the wetting tension of the lower surface is further guaranteed, and further the adhesion effect of aluminum plating is guaranteed.

Description

technical field [0001] The invention belongs to the field of packaging material production, in particular to a production method of a CPP aluminized film with high adhesion and high surface tension. 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 for the items in the package, or even premature deterioration, especially for food, which cannot meet the packaging quality requirements Require. [0003] 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. [0004] At present, the domestic packaging industry generally stays in the knowledge and understanding of the aluminum layer transfer problem after the alu...

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 an adhesive with a slightly larger molecular weight 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.