Novel degradable packaging material and preparation method thereof

Abstract

The invention relates to the technical field of degradable materials, particularly to a novel degradable packaging material and a preparation method thereof. The novel degradable packaging material comprises the following raw materials in parts by mass: 60-65 parts of PBAT, 35-40 parts of polylactic acid (PLA), 1 phr of a compatibilizer, a lubricant, 0.5 phr of a chain extender, 2-4 phr of polyalcohol and polyester polymers and 1-2 phr of a catalyst. The PLA is prepared through biological fermentation and has good biocompatibility and high strength, and final degradation products are carbon dioxide and water; a PBAT blending modification degradation technology is researched and developed, and a high-temperature and low-temperature melt blending method is designed to prepare a PBAT-PLA blend, so the tensile property and flexibility of the mixture are improved; an optimal mixing ratio is researched, analyzed and proportioned by utilizing a DSC curve, and the requirement for efficient andstable degradation is met; meanwhile, a high-compatibility combination process is researched and developed, so the problems that a blending modification method is not high in the compatibility of allmaterials and limited in the improvement of overall degradation performance are solved.

Description

technical field [0001] The invention relates to the technical field of degradation, in particular to a novel degradable packaging material and a preparation method thereof. Background technique [0002] PLA is an aliphatic polyester. Its synthetic raw material, lactic acid, can be completely fermented by biological methods, breaking away from traditional petroleum raw materials, and has good biocompatibility and high strength; at the same time, PLA is biodegradable. , the final degradation products are carbon dioxide and water, and will not pollute the environment, which makes it more and more people's attention today with the theme of environment and development, and has been widely used in the fields of daily necessities and biomedicine application. However, although PLA has high strength and compressive modulus, it is hard and tough, lacks flexibility and elasticity, is easily bent and deformed, and has poor impact and tear resistance, which limits PLA to a certain exten...

AI Technical Summary

Problems solved by technology

Predecessors prepared (PLA / PBAT) composite materials by melt blending method. Experiments show that PBAT can inhibit the crystallization of PLA, resulting in holes and grooves in the material section. With the increase of the amount of PBAT, the size of the holes in the material section will increase. increase, which will lead to a decrease in the tensile strength of the composite material, and the compatibility of the materials in the existing blending modification method is not high, and the improvement of the overall degradation performance is limited. Therefore, this project proposes a new type of degradable packaging material and its preparation method