Degradable plastic film and preparation method thereof

A technology for degrading plastics and plastics, applied in the field of degradable plastic films and their preparation, can solve problems such as phase separation, poor interface compatibility, and mechanical properties that cannot be effectively improved

Pending Publication Date: 2021-03-23
成都昌菱塘环保科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The invention provides a degradable plastic film to solve the problem of poor interfacial compatibility between the various components after adding other polymer materials or fillers to the starch film in the prior art, which easily leads to phase separation and poor mechanical properties. It has been effectively improved, and with the extension of storage or use time, the disadvantages of rapid decline in mechanical properties

Method used

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  • Degradable plastic film and preparation method thereof

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preparation example Construction

[0029] A method for preparing a degradable plastic film, the specific preparation steps comprising:

[0030] Preparation of the base plastic: Heat and blend polylactic acid and thermoplastic starch; then add metal-organic framework material, continue heating and blending, extrude and granulate to obtain the base plastic.

[0031] Further, the specific preparation steps include:

[0032] Preparation of thermoplastic starch: adding 1-5% D-sorbitol in the starch, heating and shearing to obtain thermoplastic starch;

[0033] Preparation of the base plastic: Heat and blend polylactic acid and thermoplastic starch; then add metal-organic framework material and graphene oxide, continue heating and blending, extrude and granulate to obtain the base plastic.

[0034] Further, the specific preparation steps include:

[0035] Preparation of raw materials: in parts by weight, sequentially take 100-200 parts of polylactic acid, 10-15 parts of metal-organic framework material, 20-80 parts...

Embodiment 1

[0042] Preparation of raw materials: in parts by weight, successively take 100 parts of polylactic acid, 10 parts of metal-organic framework material, 20 parts of thermoplastic starch; and graphene oxide with 0.1 times the quality of metal-organic framework material; the metal-organic framework In the material, the metal element is combined with the organic framework in a single atom state; the single atom is Cu;

[0043] Preparation of thermoplastic starch: Add D-sorbitol with 1% starch mass to the starch, add it to the reaction kettle, heat and shear for 1 hour at a temperature of 65°C, a pressure of 0.2MPa, and a shear rate of 2000r / min. , stop shearing, naturally cool to room temperature, and discharge to obtain thermoplastic starch; the starch is trimethylammonium chloride modified starch;

[0044] Preparation of matrix plastic: Pour polylactic acid and thermoplastic starch into a mixer, and add 1% of the mass of polylactic acid as an antioxidant and 1% of the mass of pol...

Embodiment 2

[0046] Preparation of raw materials: in parts by weight, successively take 150 parts of polylactic acid, 12 parts of metal-organic framework material, 50 parts of thermoplastic starch; and graphene oxide with 0.2 times the quality of metal-organic framework material; the metal-organic framework In the material, the metal element is combined with the organic framework in a single atom state; the single atom is Fe;

[0047] Preparation of thermoplastic starch: Add D-sorbitol with 3% starch mass to the starch, add it to the reaction kettle, heat and shear it for 1 hour at a temperature of 75°C, a pressure of 0.3MPa, and a shear rate of 3000r / min. , stop shearing, naturally cool to room temperature, and discharge to obtain thermoplastic starch; the starch is tetramethylammonium chloride modified starch;

[0048] Preparation of matrix plastic: Pour polylactic acid and thermoplastic starch into a mixer, and add 2% polylactic acid antioxidant and 2% polylactic acid plasticizer at a t...

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Abstract

The invention discloses a degradable plastic film and a preparation method thereof. The degradable plastic film is prepared from the following raw materials in parts by weight: 100-200 parts of polylactic acid, 10-15 parts of a metal-organic framework material and 20-80 parts of thermoplastic starch. In the metal-organic framework material, a metal element is in a monatomic state and is combined with an organic framework. The preparation method comprises the following steps of preparing thermoplastic starch, namely adding D-sorbitol which accounts for 1-5 percent of the mass of the starch intothe starch, and heating and shearing to obtain the thermoplastic starch, preparation of matrix plastic: heating and blending polylactic acid and thermoplastic starch, adding a metal-organic frameworkmaterial and graphene oxide, continuously heating and blending, and extruding and granulating to obtain matrix plastic, and preparation of the product: casting the matrix plastic into a film to obtain the degradable plastic film. The obtained product has good mechanical properties, and the mechanical properties can still be effectively maintained after long-term storage.

Description

technical field [0001] The invention relates to the technical field of polymer processing, in particular to a degradable plastic film and a preparation method thereof. Background technique [0002] The molecular structure of starch is divided into amylose and amylopectin. Amylose is mainly composed of anhydroglucose units connected by α-1,4 glycosidic bonds, and a small amount is connected by α-1,6 glycosidic bonds. Native starch generally consists of 70-80% amylopectin and 20-30% amylose. Fully disperse the starch in cold water, raise the temperature, and the starch absorbs water and swells into a starch paste. The starch paste dries on a smooth surface to form a starch film. The starch film has poor mechanical properties and low toughness. The starch-based film with good mechanical properties can be obtained by modifying the starch and blending with a reinforcing agent, which can be used as a starch-based degradable plastic. [0003] Due to the poor mechanical propertie...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08L67/04C08L87/00C08L3/02C08J5/18
CPCC08J5/18C08J2367/04C08J2403/02C08J2487/00
Inventor 雷国辉
Owner 成都昌菱塘环保科技有限公司
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