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Renewable high-barrier polyester packaging material and preparation method thereof

A packaging material and high-barrier technology, applied in flat products, other household appliances, applications, etc., can solve the problems of complex mold design, inability to recycle, and impossible to regain high-barrier packaging materials, achieving easy recycling, Excellent gas barrier properties, enhancing the effect of interfacial force

Active Publication Date: 2021-07-30
JIANGNAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The problem with the common multi-layer co-extrusion method is that although the ideal barrier layer structure can be obtained, the mold design is complex, requiring multiple extruders to work at the same time, and the product cannot be recycled after use, and it is impossible to regain high barrier layer. Packaging Materials

Method used

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  • Renewable high-barrier polyester packaging material and preparation method thereof
  • Renewable high-barrier polyester packaging material and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0036] 60 parts of polyethylene terephthalate after drying, 40 parts of polyglycolic acid, ethylene-methyl acrylate-glycidyl methacrylate copolymer (glycidyl methacrylate mass content is 8%) 3 Parts, 0.3 parts of tris[2,4-di-tert-butylphenyl] phosphite were pre-mixed in a high-speed mixer for 2 minutes, put into the extruder through continuous melt extrusion and granulation, the screw temperature was 250 ° C, the screw speed 200rpm. The dried pellets were extruded into flakes by a screw extruder and rapidly cooled to 30°C, and the screw temperature was 260°C. A renewable high-barrier packaging material can be obtained by biaxially stretching the cooled sheet using a flat film biaxial stretching process, and then heat-treated and cooled to room temperature, where the stretching temperature is 90°C (polyethylene terephthalate 15°C above the glass transition temperature of the glycol ester), the heat treatment temperature is 130°C, the transverse stretching ratio is 8 times, and...

Embodiment 2

[0038] 70 parts of polyethylene terephthalate after drying, 30 parts of polyglycolic acid, ethylene-methyl acrylate-glycidyl methacrylate copolymer (glycidyl methacrylate mass content is 8%) 3 Parts, 0.3 parts of tris[2,4-di-tert-butylphenyl] phosphite were stirred in a high-speed mixer for 2 minutes, put into an extruder through continuous melt extrusion and granulation, the screw temperature was 250°C, and the screw speed was 200rpm . The dried pellets were extruded into flakes by a screw extruder and rapidly cooled to 30°C, and the screw temperature was 260°C. The cooled sheet is biaxially stretched by the flat film biaxial stretching process, and then heat-treated and cooled to room temperature to obtain a renewable high-barrier packaging material. The stretching temperature is 90°C, and the heat treatment temperature is 130°C. The transverse stretch ratio is 8 times, and the longitudinal stretch ratio is 8 times.

Embodiment 3

[0040] 80 parts of polyethylene terephthalate after drying, 20 parts of polyglycolic acid, 0.7 part of multi-epoxy functional group compatibilizer ADR4468, tetrakis[β-(3,5-di-tert-butyl-4-hydroxy 0.3 parts of phenyl) propionic acid] pentaerythritol ester were stirred in a high-speed mixer for 2 minutes, put into an extruder through continuous melt extrusion and granulation, the screw temperature was 250°C, and the screw speed was 200 rpm. The dried pellets were extruded into flakes by a screw extruder and rapidly cooled to 30°C, and the screw temperature was 260°C. The cooled sheet is biaxially stretched by the flat film biaxial stretching process, and then heat-treated and cooled to room temperature to obtain a renewable high-barrier packaging material. The stretching temperature is 90°C, and the heat treatment temperature is 130°C. The transverse stretch ratio is 8 times, and the longitudinal stretch ratio is 8 times.

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Abstract

The invention discloses a renewable high-barrier polyester packaging material and a preparation method thereof, and belongs to the technical field of polymer processing and modification. According to the method, a polyester A and a polymer B are subjected to compatibilization modification, the technical problem that the barrier property is poor due to compatibility of the two components is solved, the polymer B of a dispersed phase forms a huge two-dimensional sheet structure in situ by cooperatively controlling a specific two-way stretching process, the diffusion path of gas small molecules in the film is greatly increased, the gas permeability coefficient can be reduced by 1-2 orders of magnitude, and the two-dimensional filler and the in-situ formed two-dimensional polymer B are bridged to form a barrier network, so that the renewable high-barrier packaging material with a macroscopic single-layer, microcosmic multi-layer and multi-component special microstructure is prepared, and the high-barrier packaging material can be obtained again through melt processing by the method after molding, is easy to recycle, and has essential difference and remarkable progress compared with a traditional multi-layer composite film.

Description

technical field [0001] The invention relates to a renewable high-barrier polyester packaging material and a preparation method thereof, belonging to the technical field of polymer processing and modification. Background technique [0002] Polyester film is usually colorless, transparent, shiny, strong, tough and elastic. Compared with other plastic films, it has high relative density and high tensile strength. It has the advantages of moderate elongation and is widely used in packaging materials. However, due to the poor barrier properties of polyester film to water, oxygen and other gases, as a packaging material, it is easy to change the package due to the influence of moisture, oxygen and microorganisms, which seriously affects its application in the field of food and drug packaging. Therefore, people have been devoting themselves to improving the gas barrier properties of polyester films through various technical approaches. Polyglycolic acid (PGA) is a green biodegrad...

Claims

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Application Information

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IPC IPC(8): C08L67/02C08L67/04C08L23/08C08L69/00C08L33/10C08K5/1515C08K3/34C08K3/38C08K3/04C08J5/18B29D7/01B29C55/12
CPCC08J5/18B29D7/01B29C55/12C08J2367/02C08J2467/04C08J2367/04C08J2423/08C08J2369/00C08J2469/00C08J2433/10C08K5/1515C08K3/34C08K2003/385C08K3/042C08K3/346
Inventor 马丕明钮德宇潘锦涛杨伟军徐鹏武
Owner JIANGNAN UNIV
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