Shading master batch for high-shading packaging material and preparation method of shading master batch

Abstract

The invention provides a shading master batch for a high-shading packaging material. The shading master batch is prepared from the following raw materials in parts by weight: 25-30 parts of PET resin, 60-66 parts of titanium dioxide, 1-3 parts of organic silicon, 3-6 parts of PS resin, 1.5-3.5 parts of a compatilizer, 0.1-0.3 part of a lubricant and 1-2 parts of graphite powder, wherein the PS resin is a copolymer with a soft chain segment. The invention also provides a preparation method of the shading master batch for the high-shading packaging material. The PET packaging material prepared from the shading master batch has good shading performance while having better performance, and the shading uniformity of a bottle body is better.

Description

technical field [0001] The invention relates to the technical field of food packaging materials, in particular to a light-shielding master batch for high light-shielding packaging materials and a preparation method thereof. Background technique [0002] Dairy products are easily affected by light-induced oxidation, resulting in a loss of nutritional value and loss of vitamins A, B2, D and amino acids, so special attention needs to be paid to the protection of packaging materials. [0003] Most of the existing light-shielding protective materials are in the form of multi-layers. Such a process is a test of the compatibility between the multi-layer materials, and the requirements for the process are also very high, so the investment cost is relatively high. [0004] It is also possible to improve the light-shielding performance of packaging materials by adding light-shielding masterbatches to the material, and directly add light-shielding masterbatches to PET particles through...

AI Technical Summary

Problems solved by technology

In this invention, firstly, the specific gravity of titanium dioxide is high, the dispersion of the system is poor, and the method of mixing all materials together for granulation will inevitably cause uneven feeding, resulting in uneven products; secondly, the compatibility of the system is poor, As a result, the performance of PET is seriously reduced, and the material is prone to delamination during the preparation process, which leads to a high scrap rate in the preform blow molding process; finally, the smell of aluminum powder is heavy, which may affect the taste of the product

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