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A kind of polylactic acid/starch high barrier composite film and preparation method thereof

A technology of high-barrier composite film and polylactic acid, which is applied in the direction of chemical instruments and methods, synthetic resin layered products, sustainable manufacturing/processing, etc., can solve the problem of complex preparation of block polymers, complex preparation processes of copolymers, and unsuitable Problems such as popularization and application, to achieve the effect of expanding the application scope and application field, easy promotion and application, and low production cost

Active Publication Date: 2019-03-12
SHANDONG AGRICULTURAL UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the preparation of this block polymer is complicated, and the price is expensive, which is not suitable for popularization and application.
Invention patent CN201310682547.X discloses a high-barrier fully biodegradable composite film, the composite film has a three-layer structure, and the outer layer is polybutylene terephthalate / adipate and polybutylene adipate -Propylene carbonate blend, the middle layer is polylactic acid and polylactic acid / propylene carbonate blend, however, the preparation process of the copolymer in the outer layer or the inner layer is complicated and expensive, and cannot solve the existing corresponding problems in technology

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0039] A polylactic acid / starch high barrier composite film, its specific components and preparation method are as follows:

[0040](1) The composition of the starch nanocomposite layer and the preparation method of the pellets: 5.6Kg of hydroxypropyl tapioca starch (degree of substitution 0.5), 2.4Kg of polyvinyl alcohol, polyadipate / butylene terephthalate 600g, organically modified montmorillonite 600g, maleic anhydride 70g, zinc stearate 180g, calcium stearate 360g, monoglyceride 45g, citric acid 92.4g, glycerin 2.41Kg, polylactide glycol 0.5Kg, Pour 45g of paraffin into a high-speed mixer, stir and mix; the mixed material is granulated in a twin-screw extrusion granulator, the temperature of the granulator is 100-170°C, the temperature of the head is 160°C, and the screw speed is 150rpm. The powder is processed into pellets with a diameter of 1-3mm.

[0041] (2) Composition of polylactic acid composite material and preparation method of pellets: polylactic acid 6.5Kg, pol...

Embodiment 2

[0046] A polylactic acid / starch high barrier composite film, its specific components and preparation method are as follows:

[0047] (1) The composition of the starch nanocomposite material layer and the preparation method of the pellets thereof: tapioca starch acetate (degree of substitution 0.3) 6.6Kg, polyvinyl alcohol 1.2Kg, polypropylene carbonate 400g, nano silicon dioxide 500g, Zinc stearate 120g, calcium stearate 240g, silane coupling agent KH550 70g, monoglyceride 60g, citric acid 86g, glycerin 2.4Kg, polycarbonate diol 0.3Kg, diacetin 250g, paraffin 48g Put it into a high-speed mixer, stir and mix; the mixed material is granulated in a twin-screw extrusion granulator, the granulation temperature is 110-175 ° C, the head temperature is 170 ° C, the screw speed is 200 rpm, and the powder is processed into Granules with a diameter of 1-3mm.

[0048] (2) Composition of polylactic acid composite material and preparation method of pellets: polylactic acid 5.9Kg, polyadipa...

Embodiment 3

[0053] A polylactic acid / starch high barrier composite film, its specific components and preparation method are as follows:

[0054] (1) The composition of the starch nanocomposite layer and the preparation method of the pellets: 7.5Kg of hydroxypropyl cross-linked potato starch (hydroxypropyl substitution degree 0.1), 1.0Kg of polyvinyl alcohol, and 0.5Kg of carboxymethyl cellulose , polyhydroxyalkanoate 800g, organically modified montmorillonite 600g, maleic anhydride 80g, zinc stearate 150g, calcium stearate 300g, monoglyceride 55g, adipic acid 62g, glycerin 2.5Kg, glycerol triacetate 240g of ester, 0.4Kg of polyglycolide glycol, and 45g of paraffin are poured into a high-speed mixer, stirred and mixed; the mixed material is granulated in a twin-screw extrusion granulator, and the temperature of the granulator is 80-170 ℃, head temperature 165 ℃, screw speed 180rpm, process the powder into pellets with a diameter of 1-3mm.

[0055] (2) The composition of polylactic acid co...

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Abstract

The invention relates to the field of food packaging, and particularly provides a polylactic acid / starch high-barrier composite film and a preparation method thereof. The film is of a sandwich structure; a polylactic acid layer is an outer layer; a sandwich layer is a starch nano composite material layer, and the thickness of the sandwich layer is 50 to 90 percent of the whole composite film. The composite film adopting the structure is high in mechanical performance, biodegradability, flexibility, water resistance and heat sealability and excellent in gas barrier property, can be widely applied to the field of packaging of fresh agricultural products, high-oil-content food and other oxidization-liable products and packaging and application of supermarket shopping bags, garbage bags.

Description

technical field [0001] The invention relates to the field of food packaging, and specifically provides a polylactic acid / starch high-barrier composite film and a preparation method thereof. Background technique [0002] The environmental pollution caused by petroleum-based plastics is becoming more and more serious, and there is an urgent need to replace them with fully degradable plastics. Polylactic acid is a fully degradable material widely studied at home and abroad. However, the film prepared by pure polylactic acid has poor toughness and small elongation at break, which is limited in many application fields. Therefore, in the actual processing process, polylactic acid is usually blended and modified with other synthetic polyesters to improve its application performance. [0003] The high raw material cost of polylactic acid is another important reason that limits its popularization and application. Therefore, the compounding of polylactic acid and natural polymers c...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B32B27/28B32B27/18B32B27/22B32B9/02B32B9/04B32B37/00B65D65/40C08L3/08C08L29/04C08L67/02C08L67/04C08K13/06C08K9/04C08K3/34C08K5/098C08L91/00C08L3/06C08L69/00C08K13/02C08K3/36C08L1/28
CPCB32B9/02B32B9/045B32B27/18B32B27/22B32B27/28B32B37/00B32B2307/73B65D65/40C08J5/18C08J2303/06C08J2303/08C08J2367/04C08J2403/06C08J2429/04C08J2467/02C08K2201/011C08L3/06C08L3/08C08L67/04C08L2201/06C08L2201/14C08L2203/16C08L2205/02C08L2205/025C08L2205/035C08L29/04C08L67/02C08K13/06C08K9/04C08K3/346C08K5/098C08L91/00C08L69/00C08K13/02C08K3/36C08L1/286Y02W90/10
Inventor 侯汉学董海洲王文涛张慧代养勇
Owner SHANDONG AGRICULTURAL UNIVERSITY
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