Impact-resistant packaging sheet and its preparation method

Abstract

The invention discloses an impact-resistant packaging sheet and a preparation method thereof. The impact-resistant packaging sheet is composed of a substrate layer and surface layers on both sides of the substrate layer. The substrate layer is composed of non-crystalline polyethylene terephthalate APET, and the surface layer is composed of the following components by weight percentage: polyethylene terephthalate-1,4-cyclohexanedimethanol PETG resin 85%~95%, smooth masterbatch 0.1%~0.5%, 0.2%~1% antistatic agent, other additives 4%~14%. The preparation method of the impact-resistant packaging sheet is to pre-crystallize APET and then dry it, then dry the PETG, weigh other components and mix them with the dried PETG evenly, and use a multi-layer co-extrusion sheet extruder to The sheet is extruded, extruded by the die head, calendered by three rollers, and then trimmed, drawn and wound to obtain an impact-resistant packaging sheet. Shock-resistant packaging sheet materials have good component compatibility, no delamination of the sheet, high transparency, smooth surface, and good impact resistance.

Description

technical field [0001] The invention relates to a polymer composite sheet, in particular to an impact-resistant packaging sheet and a preparation method thereof. Background technique [0002] Amorphous polyethylene terephthalate APET's trim and waste products can be recycled. It is a degradable plastic with high transparency, good gas barrier properties, good rigidity and extensibility. It is widely used in cosmetics, Packaging for food, electronics, toys, printing and other industries. However, APET has poor water resistance, especially in the case of high temperature and high humidity, such as during sea transportation, the material will be hydrolyzed, resulting in the material becoming brittle and reducing the impact resistance, resulting in material cracking and other problems. In order to improve the impact resistance of APET sheets, polyolefin elastomers are usually selected as tougheners, such as POE, SBS, EPDM, etc., but such tougheners will affect the transparency ...

AI Technical Summary

Problems solved by technology

However, APET has poor water resistance, especially in the case of high temperature and high humidity, such as during sea transportation, the material will be hydrolyzed, resulting in the material becoming brittle and reducing the impact resistance, resulting in material cracking and other problems

In order to improve the impact resistance of APET sheets, polyolefin elastomers are usually selected as tougheners, such as POE, SBS, EPDM, etc., but such tougheners will affect the transparency of APET, and usually need to add compatibilizers

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