A polypropylene resin composition for making high -temperature cooking CPP film and its high -temperature cooking CPP film

Abstract

The invention discloses a polypropylene resin composition for manufacturing a high temperature cooking CPP film and the high temperature cooling CPP film. The polypropylene resin composition comprises a polypropylene resin matrix and an additive; the weight ratio of the polypropylene resin matrix to the additive is 100:(0.08-0.20); the polypropylene resin matrix is a polypropylene copolymer formed by copolymerizing 93-995wt% of propylene and 0.5-7wt% of C4-C8 alpha-straight-chain olefins; the melt flow rate of the polypropylene resin matrix is 7.0-10.0 g / 10 min, and the isotacticity of the polypropylene resin matrix is 95.0-98.0%; the additive comprises the following components in parts by weight: 100 parts of a main antioxidant, 40-55 parts of an auxiliary antioxidant A, 20-35 parts of an auxiliary antioxidant B and 50 parts of an acid-acceptor. The polypropylene resin composition and the high temperature cooling CPP film can not only meet the high temperature cooking CPP processing technique requirements, but also ensure that the high temperature cooking CPP film has a better mechanical property, a better optical property and color change resistance.

Description

technical field [0001] The invention relates to a polypropylene resin composition, in particular to a polypropylene resin composition for manufacturing a high-temperature cooking CPP film and a high-temperature cooking CPP film. Background technique [0002] Cast film (Castfilnl) is a non-stretched, non-oriented flat extrusion film produced by melt casting and quenching. Compared with blown film, it is characterized by fast production speed, high output, good film transparency, gloss, uniform thickness, and excellent balance of isotropic properties. At the same time, because it is extremely convenient for subsequent processes such as printing and compounding, it is widely used in the packaging of textiles, flowers, food, and daily necessities. [0003] CPP film can be divided into retort CPP film (Retort CPP, RCPP for short), aluminum-coated CPP film (Metalize CPP, MCPP for short), general CPP film (General CPP, GCPP for short), etc. Retort grade refers to composite substr...

AI Technical Summary

Problems solved by technology

However, improper selection of additives or improper addition of additives will lead to a decrease in the quality of the film while obtaining good oxidation resistance of the film, and even worsen the film-forming processability.

The common primary antioxidant tetrakis [β-(3,5-di-tert-butyl-4-hydroxyphenyl) propionate] pentaerythritol ester, auxiliary antioxidant tris (2,4-di-tert-butylphenyl) The stabilization system represented by phosphite is widely used in CPP special materials, but the biggest shortcoming of this formula system is that it has poor anti-discoloration ability, and the film is prone to discoloration such as yellowing and redness after storage for a short time, which affects Micro-appearance and properties of high-temperature cooking CPP film

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