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PBAT/modified starch full-biodegradable film with high ductility and high barrier property, and preparation method and application thereof

A technology of degrading film and ductility, applied in the field of modified starch, can solve the problems of poor barrier performance of PBAT, difficult to package products, etc., and achieve the effect of increasing extrusion plasticizing effect, easy operation control, and reducing melt viscosity.

Active Publication Date: 2018-12-04
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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  • PBAT/modified starch full-biodegradable film with high ductility and high barrier property, and preparation method and application thereof
  • PBAT/modified starch full-biodegradable film with high ductility and high barrier property, and preparation method and application thereof
  • PBAT/modified starch full-biodegradable film with high ductility and high barrier property, and preparation method and application thereof

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 full-biodegradable film with a high ductility and a high barrier property, and a preparation method and an application thereof. The preparation method comprises the following steps: premixing starch with a plasticizer according to a mass ratio of 6:4 to 8:2 in order to obtain a premix, adding a polybasic organic acid, mixing the premix with the polybasic organic acid, and performing A extruding granulation to obtain acidified modified thermoplastic starch; and performing double-screw blendingB extrusion on the acidified modified thermoplastic starch and PBAT to prepare a PBAT / AMTPS blend, and performing extrusion-film blowing to obtain the PBAT / modified starch full-biodegradable film. ThePBAT / modified starch full-biodegradable film has good processing performances and good mechanical properties, has an improved fracture elongation reaching 1000-1400%, has a good gas barrier property,has a low gas permeability coefficient reaching 5.6 * 10<-9> cm<3>.cm.cm<-2>.s<-1>.Pa<-1>, and can be applied to fields of food packaging, mulch films and garbage bags.

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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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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