Transparent temperature-resistant polyester composite material containing regenerated material and preparation method of transparent temperature-resistant polyester composite material

By blending RPET and PCT-G and adding composite antioxidants, the environmental protection, performance and stability issues of transparent polyester materials at high PCR content have been solved, resulting in polyester composite materials with high transparency, toughness and environmental stability, suitable for a variety of processing and application scenarios.

CN121699353APending Publication Date: 2026-03-20SHANGHAI SHENGTAIPU NEW MATERIAL TECHNOLOGY CO LTD
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Patent Information

Application Number
CN202511974742.9
Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Filing Date
2025-12-25
Publication Date
2026-03-20

AI Technical Summary

Technical Problem

Existing transparent polyester materials, when subjected to high PCR content, struggle to balance environmental friendliness, performance stability, compliance, and environmental stability. In particular, they are prone to yellowing, brittleness, and decreased light transmittance under high temperature and humidity conditions.

Method used

A transparent, heat-resistant polyester composite material is formed by blending recycled polyethylene terephthalate (RPET) and polyethylene glycol-1,4-cyclohexanediethanol terephthalate (PCT-G) in a specific ratio, combined with composite antioxidants, compatibilizers, anti-hydrolysis agents and nucleating agents, and through precise optimization of preparation process parameters.

Benefits of technology

It achieves high transparency, excellent toughness and impact resistance, meets food contact grade certification, is resistant to high temperature and high humidity environments, and is suitable for a variety of processing methods and application scenarios.

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Abstract

The invention belongs to the field of high polymer materials, and particularly relates to a transparent temperature-resistant polyester composite material containing regenerated materials and a preparation method of the transparent temperature-resistant polyester composite material. The composite material is prepared from the following raw materials in parts by weight: 30 to 70 parts of food contact grade recycled polyethylene glycol terephthalate (RPET), 30 to 70 parts of polyethylene terephthalate-1, 4-cyclohexanedimethanol ester (PCT-G), 0.3 to 0.5 part of composite antioxidant, 1 to 5 parts of compatilizer and the like. The preparation method comprises the steps of raw material pretreatment drying, premixing, melt blending granulation and the like, and component compatibility is optimized by accurately controlling drying parameters, extrusion temperature and rotating speed. The method has the advantages of high PCR content, product light transmittance of more than or equal to 88%, haze of less than or equal to 2%, impact strength of more than or equal to 60J / m, temperature resistance, hydrolysis resistance, accordance with food contact authentication, simple process, low cost and suitability for the fields of packaging, medical treatment and the like.
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