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A fully biodegradable film with adjustable properties and its preparation method

A technology of degrading film and whole biology, applied in the field of biodegradable polymer materials, can solve the problems of low PBAT strength, poor mechanical properties of the film, affecting the degradation performance of the film, etc., to improve the dispersibility and compatibility, excellent physical and chemical properties. performance, the effect of excellent degradability

Active Publication Date: 2020-10-02
XIAMEN AMESON NEW MATERIAL INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, PBAT has the disadvantages of low strength and high elongation at break, it is not resistant to strong acids and alkalis, it is flammable, it is easy to decompose at high temperature, and its processing performance is relatively poor.
[0005] Although PLA and PBAT are compounded to prepare film materials in the prior art and applied to agricultural mulch films, they are rarely used in cushioning and protective air cushion films.
Moreover, agricultural films are mostly blown by single-layer blown film equipment. In the process of preparing three-layer air-cushion film by three-layer co-extrusion, if the conventional single-layer agricultural film preparation method is directly used, the formula design is limited by the machine. The conventional air cushion machine does not match. During the preparation process, the raw material is extruded softly at the die, causing the film to swing greatly, and the film bubble is unstable, resulting in an uneven three-layer structure of the obtained film, which affects its tensile properties, pressure resistance, and resistance. Mechanical properties such as puncture strength and low temperature heat seal strength
In addition, due to the poor compatibility of the above two materials, the mechanical properties of the obtained film are not good. For this reason, additives such as solubilizers and plasticizers are often needed to improve the compatibility between the components. However, the addition of the above additives will Affect the degradation performance of the film, the use of the film will still pollute the environment

Method used

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  • A fully biodegradable film with adjustable properties and its preparation method
  • A fully biodegradable film with adjustable properties and its preparation method
  • A fully biodegradable film with adjustable properties and its preparation method

Examples

Experimental program
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preparation example Construction

[0049] A second aspect of the present invention provides a method for preparing the above-mentioned fully biodegradable film, comprising the steps of:

[0050] S01: Take the preparation raw materials according to the formula ratio, dry them and mix them in a stirring tank;

[0051] S02: According to the ratio, the raw materials are added to the electronic metering hopper of the inner, outer and middle layers, melted and extruded by the screw extruder, and converged at the mouth of the die (using a high-density die head) to form a three-stage welded tube blank;

[0052] S03: Inflate the tube blank obtained in step S02 to the desired ratio by blowing air from the fan, then cool it with the surrounding air, and then perform post-processing to obtain the fully biodegradable film.

[0053] In some embodiments, the inflation ratio of the tube billet is 5-10; the heating temperature of the outer layer and the middle layer screw extruder is 130-160°C; the inner layer screw extruder T...

Embodiment 1

[0067] Embodiment 1 provides a kind of fully biodegradable film, and described fully biodegradable film comprises outer layer, middle layer and inner layer; The preparation raw material of described outer layer comprises the polylactic acid of 50 weight parts and the degradable polylactic acid of 35 weight parts ester copolymer; the preparation raw materials of the middle layer include 30 parts by weight of polylactic acid and 55 parts by weight of degradable polyester copolymer; the preparation raw materials of the inner layer include 5 parts by weight of polylactic acid and 85 parts by weight of degradable polyester copolymer Degradation of polyester copolymers;

[0068] The quality of the outer layer accounts for 25wt% of the mass of the fully biodegradable film; the mass of the middle layer accounts for 35wt% of the mass of the fully biodegradable film; the mass of the inner layer accounts for the mass of the fully biodegradable film 20wt%.

[0069] The polylactic acid wa...

Embodiment 2

[0079] Embodiment 2 provides a fully biodegradable film, the fully biodegradable film includes an outer layer, a middle layer and an inner layer; the preparation raw materials of the outer layer include 65 parts by weight of polylactic acid and 50 parts by weight of degradable poly ester copolymer; the preparation raw material of described middle layer comprises the polylactic acid of 45 weight parts and the degradable polyester copolymer of 70 weight parts; The preparation raw material of described inner layer comprises the polylactic acid of 15 weight parts and the degradable polyester copolymer of 95 weight parts Degradation of polyester copolymers;

[0080]The quality of the outer layer accounts for 40wt% of the mass of the full biodegradable film; the mass of the middle layer accounts for 45wt% of the mass of the full biodegradable film; the mass of the inner layer accounts for the mass of the full biodegradable film 35wt%.

[0081] The polylactic acid was purchased from...

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Abstract

The invention relates to the field of biodegradable high polymer materials and specifically relates to a fully biodegradable film with adjustable performances and a preparation method thereof. The preparation raw material of the fully biodegradable film includes polylactic acid and degradable polyester copolymer, wherein the molecular chain of degradable polyester copolymer contains an aliphatic polyester chain segment and an aromatic polyester chain segment.

Description

technical field [0001] The invention relates to the field of biodegradable polymer materials, in particular to a fully biodegradable film with adjustable properties and a preparation method thereof. Background technique [0002] Nowadays, plastic film products have been widely used in all walks of life in human society, and film products are mainly made of HDPE and LDPE materials. PE film is the most commonly used polymer film and is a necessity in daily life. Most of the products are of one-time use nature, that is, they are thrown away after use and discarded at will. At the same time, PE is a non-degradable material. If it is buried in the soil, it will not degrade for hundreds or even thousands of years, which will cause soil compaction and denaturation, and the roots of plants will be wrapped and entangled, affecting the absorption of water and nutrients. The output has dropped sharply. If incineration is used, a large amount of toxic and harmful gases will be produced...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B32B27/06B32B27/08B32B27/18B32B27/36C08L67/02C08L67/04C08J5/18
CPCB32B27/08B32B27/18B32B27/36B32B2250/244B32B2270/00B32B2307/31B32B2307/54B32B2307/558B32B2307/7163B32B2307/7242C08J5/18C08J2367/02C08J2367/04C08J2467/02C08J2467/04
Inventor 涂宗铃陈赐辉
Owner XIAMEN AMESON NEW MATERIAL INC
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