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A pbat/modified starch fully biodegradable film with both high ductility and high barrier properties and its preparation method and application

A technology of degradable film and ductility, applied in the field of modified starch, can solve the problems of difficult packaging products application, poor barrier performance of PBAT, etc., and achieve the effects of easy operation control, increased extrusion plasticization effect, and easy processing

Active Publication Date: 2020-09-22
SOUTH CHINA UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Lange J et al [Packaging Technology&Science,2003,16(4):149-158.] reported that PBAT has poor barrier properties, so it is difficult to apply in packaging products
However, the method of preparing high barrier properties and mechanical properties through organic acid modification has not been reported in the literature.

Method used

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  • A pbat/modified starch fully biodegradable film with both high ductility and high barrier properties and its preparation method and application
  • A pbat/modified starch fully biodegradable film with both high ductility and high barrier properties and its preparation method and application
  • A pbat/modified starch fully biodegradable film with both high ductility and high barrier properties and its preparation method and application

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0036] The starch was dried at 110°C for 4h. Then starch and glycerol are pre-mixed according to the mass ratio of 7:3. Then 1% (based on starch quality) tartaric acid is crushed in a high-speed crusher, mixed with starch / glycerol premixture, and extruded by twin-screw reaction (extrusion temperature 125-145°C, screw speed 80 rpm) , granulated to obtain acidified modified thermoplastic starch (AMTPS-1).

Embodiment 2

[0038]The starch was dried at 110°C for 4h. Then starch and glycerol are pre-mixed according to the mass ratio of 8:2. Then 2% (based on starch quality) tartaric acid is crushed in a high-speed crusher, mixed with starch / glycerol premixture, and extruded by twin-screw reaction (extrusion temperature 125-145°C, screw speed 80 rpm) , granulated to obtain acidified modified thermoplastic starch (AMTPS-2).

Embodiment 3

[0040] The starch was dried at 110°C for 4h. Then starch and glycerol are pre-mixed according to the mass ratio of 7:3. Then 3% (based on starch quality) tartaric acid is crushed in a high-speed crusher, mixed with starch / glycerol premixture, and extruded by twin-screw reaction (extrusion temperature 125-145 ° C, screw speed is 80 rpm) , granulated to obtain acidified modified thermoplastic starch (AMTPS-3).

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Abstract

The invention belongs to the technical field of modified starch, and discloses a PBAT / modified starch fully biodegradable film with high ductility and high barrier performance, a preparation method and application thereof. The preparation method of the present invention comprises the following steps: pre-mixing starch and plasticizer at a mass ratio of 6:4 to 8:2 to obtain a pre-mixture, then adding multi-component organic acid for mixing, extruding A to granulate, and obtaining acidified modified thermoplastic Starch; and PBAT through twin-screw blending and extrusion B to prepare PBAT / AMTPS blends, and obtain PBAT / modified starch fully biodegradable films by extrusion-blown film molding, which have good processing properties and good mechanical properties , the elongation at break is increased to 1000-1400%, and the gas barrier property is good, and the gas transmission coefficient is as low as 5.6×10 ‑9 cm 3 ·cm·cm ‑2 ·s ‑1 ·Pa ‑1 , can be used in food packaging, plastic film and garbage bags and other fields.

Description

technical field [0001] The invention belongs to the technical field of modified starch, and in particular relates to a PBAT / modified starch fully biodegradable film with high ductility and high barrier performance, a preparation method and application thereof. Background technique [0002] Starch has the advantages of low price, easy processing and modification, and good biodegradability. Blending with other biodegradable polymer materials can reduce the cost of materials and improve the biodegradability of the blend. The molecular chain structural units of polybutylene terephthalate-butylene adipate (PBAT) have ester bonds and more methylene and aromatic rings, which together endow it with the characteristics of flexibility and rigidity , especially with excellent ductility and toughness, is one of the most popular degradable plastics on the market, and has broad application prospects in the field of biodegradable film materials. However, PBAT films have defects such as hi...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08L67/02C08L3/04C08L3/06C08J5/18B65D65/46
CPCB65D65/466C08J5/18C08J2403/04C08J2367/02Y02W90/10B29B9/12B29B9/06B29B7/007B29B7/48B29B7/92
Inventor 张水洞林泽声
Owner SOUTH CHINA UNIV OF TECH
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