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Full-biodegradable film and preparation method thereof

A degradable film and all-biological technology, which is applied in the composition and preparation of high-toughness fully biodegradable films, can solve the problems of poor film toughness, high price, and unacceptable cost of ordinary packaging materials, and achieve excellent toughness and full biodegradability. Guaranteed mechanical properties and low cost effects

Inactive Publication Date: 2015-07-01
NANTONG LONGDA BIO TECH NEW MATERIALS CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The fully biodegradable materials that have been produced on a large scale so far include polypropylene carbonate (PPC), polybutylene succinate (PBS), polybutylene glycol-succinic acid / adipic acid copolyester (PBSA) , polylactic acid (PLA), polycaprolactone (PCL), polyglycolic acid (PGA), polybutylene adipate / terephthalate (PBAT) and polyhydroxyalkanoate (PHA) (Plastic Technology, 35(7), 92-97, 2007; Polyester Industry, 21(3), 3-8, 2008), etc. However, although PBS, PBSA, PGA, PCL and other materials have good film-forming properties, their prices are relatively high. Because the cost of ordinary packaging materials is unacceptable; the price of PPC and PLA materials is relatively low, but the films prepared separately have poor toughness and cannot meet the needs of daily packaging
[0004] Chinese patent application number CN201210297866 discloses a fully biodegradable composite material using polylactic acid (PLA), polybutylene adipate / terephthalate (PBAT) and modified starch as raw materials, but when the PBAT content is low When the content of PBAT is higher, the performance is better, but the price is higher

Method used

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  • Full-biodegradable film and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] PBAT: weight average molecular weight 40kDa; molecular weight distribution: 1.9 35 parts

[0026] PLA: weight average molecular weight 110kDa; molecular weight distribution: 2.2 35 parts

[0027] PPC: weight average molecular weight 540kDa; molecular weight distribution: 3.4 29 parts

[0028] Stabilizer: 1 part stearic acid

[0029] Method: After the raw material is dried, use a twin-screw extruder with an aspect ratio of 44 to granulate. After the pellets are dried, use a single-screw extruder with an aspect ratio of 18 to blow the film. The inflation ratio is 2.8:1. 25um thick.

Embodiment 2

[0031] raw material:

[0032] PBAT: weight average molecular weight 60kDa; molecular weight distribution: 2.8 50 parts

[0033] PLA: weight average molecular weight 170kDa; molecular weight distribution: 3.3 25 parts

[0034] PPC: weight average molecular weight 660kDa; molecular weight distribution: 4.1 24 parts

[0035] Stabilizer: 1 part stearic acid

[0036] Method: After the raw material is dried, use a twin-screw extruder with an aspect ratio of 44 to granulate. After the pellets are dried, use a single-screw extruder with an aspect ratio of 18 to blow the film. The inflation ratio is 2.5:1. 20um thick.

Embodiment 3

[0038] raw material:

[0039] PBAT: weight average molecular weight 40kDa; molecular weight distribution: 1.9 60 parts

[0040] PLA: weight average molecular weight 170kDa; molecular weight distribution: 3.3 20 parts

[0041] PPC: weight average molecular weight 540kDa; molecular weight distribution: 3.4 19 parts

[0042] Stabilizer: 1 part stearic acid

[0043] Method: After the raw material is dried, use a twin-screw extruder with an aspect ratio of 44 to granulate. After the pellets are dried, use a single-screw extruder with an aspect ratio of 18 to blow the film. The inflation ratio is 3:1. 18um thick.

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Abstract

The invention relates to a composition of a high-tenacity full-biodegradable film and a preparation method thereof. The film is prepared from polylactic acid (PLA), poly propylene carbonate (PPC), polybutylene adipate terephthalate (PBAT) and a heat stabilizer. Blending modification sections are prepared by adopting a twin-screw extruder, blow molding is carried out by adopting a single-screw extruder, the prepared film has excellent tenacity and full biodegradable performance, and meanwhile the cost is low, so that the film is an ideal substitute for a current non-degradable film packing material.

Description

technical field [0001] The invention relates to a composition and preparation method of a high-toughness fully biodegradable film, in particular to a film made of polypropylene carbonate (PPC), polylactic acid (PLA), polyadipate / butylene terephthalate ( PBAT) is a fully biodegradable film prepared as a raw material and a preparation method thereof. Background technique [0002] Plastic film packaging materials play a huge role in daily life and production, but most of the plastic packaging films currently used are non-degradable or photodegradable products (polyethylene). The use of a large number of film materials has caused a large amount of white pollution and brought a lot of environmental problems. Replacing the current polyethylene products with biodegradable materials is an important means to solve white pollution. [0003] The fully biodegradable materials that have been produced on a large scale so far include polypropylene carbonate (PPC), polybutylene succinate (...

Claims

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Application Information

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IPC IPC(8): C08L67/02C08L67/04C08L69/00C08K5/09B29C47/92B29C55/28B29L7/00B29C48/92
Inventor 张春华
Owner NANTONG LONGDA BIO TECH NEW MATERIALS CO LTD
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