Preparation method of polypropylene resin composition for high temperature boiling CPP film

Abstract

The invention discloses a preparation method of a polypropylene resin composition for high temperature boiling a CPP film, which comprises the following steps: respectively metering a polypropylene resin base-material, a main anti-oxidant, an auxiliary anti-oxidant A, an auxiliary anti-oxidant B and an acid absorption agent and uniformly mixing; placing in a double screw extruder for melting, mixing and granulating, wherein the stay time of the material in a screw is 2-4 minutes, the screw temperature is controlled at 190-220 DEG C, and the screw rotating speed is controlled at 80-120 revolutions per minute; cooling, and drying the obtained polypropylene resin particles to obtain the finished product. According to the invention, the high temperature boiling CPP processing technology requirement can be satisfied, and the high temperature boiled CPP film has more excellent mechanical property, optics performance and anti color-changing performance.

Description

technical field [0001] The invention relates to a polypropylene resin composition, in particular to a polypropylene resin composition used for manufacturing a high-temperature cooking CPP film, and also relates to a preparation method of the polypropylene resin composition 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), aluminized CPP film (Metalize CPP, MCPP for short), general CPP ...

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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