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Preparation method of easily degradable plastic film

A technology of easily degradable plastics and composite plastics, applied in the field of preparation of easily degradable plastic films, can solve problems such as impact on mechanical properties, environmental pollution, pollution, etc., and achieve the effects of excellent mechanical strength, excellent mechanical properties, and convenient particle size

Inactive Publication Date: 2020-02-21
卢贵宝
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Fully biodegradable plastics have problems such as cost and poor mechanical properties
Incompletely biodegradable plastics still have certain environmental pollution because there are still non-degradable plastics in the raw materials. Photodegradable plastics must be degraded under the condition of light, and those buried deep in the soil cannot be degraded.
Photo / biodegradable plastics have two degradation mechanisms at the same time. As long as one condition exists, they can start to degrade and decompose into small fragments. However, like photodegradable plastics, they have the characteristic that they cannot be completely degraded.
[0004] The development of science and technology has produced a lot of pollution, and the environmental performance of fully biodegradable plastics can effectively alleviate human pollution to the environment, but the defects of fully biodegradable plastics in terms of mechanical properties have seriously affected the application of such materials. The mechanical properties of fully biodegradable plastics will greatly broaden the range of applications of such materials and provide a solution to the problem of plastic pollution in the future

Method used

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  • Preparation method of easily degradable plastic film

Examples

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Effect test

preparation example Construction

[0025] The embodiment of the present invention proposes a method for preparing an easily degradable plastic film, comprising the following steps:

[0026] Step S1: Grind the straw to 50-150 mesh to obtain straw powder; the straw of crops is used in the production of plastics, which belongs to waste utilization, which can effectively reduce the cost of plastics, and the straw can be completely decomposed under the action of microorganisms. Among the biodegradable plastics, the above-mentioned plastics still have the performance of complete biodegradation. At the same time, there is a large amount of cellulose in the straw powder, which can improve the mechanical strength of the plastic to a certain extent.

[0027] Step S2: drying the bio-based PBAT biodegradable resin, bio-based PBS biodegradable resin, straw powder, pectin and lignin at a vacuum of 50-500Pa and a temperature of 45-55°C for 2-3 hours; PBAT biodegradable resin and bio-based PBS biodegradable resin are two kind...

Embodiment 1

[0039] The present embodiment proposes a kind of preparation method of easily degradable plastic film, and it comprises the following steps:

[0040] Step S1: Grinding the straw to 100 mesh to obtain straw powder.

[0041] Step S2: vacuum-dry the bio-based PBAT biodegradable resin, bio-based PBS biodegradable resin, straw powder, pectin and lignin in a vacuum drying oven, wherein the vacuum drying conditions are a vacuum degree of 250Pa and a temperature of 50°C. Dry for 2.5 hours under the same conditions;

[0042]Step S3: 1.5 L of ethanol and 8 L of distilled water were uniformly mixed to prepare a water-ethanol mixed solvent. Mix well dried 1000g bio-based PBAT biodegradable resin, 1000g bio-based PBS biodegradable resin, 400g straw powder, 200g pectin and 200g lignin, and 300g additives, 2000g water-ethanol mixed solvent prepared above to obtain a mixed material. Wherein, the additive is a mixture of 100g of polyphenol and 200g of fatty acid ester.

[0043] Step S4: us...

Embodiment 2

[0046] The present embodiment proposes a kind of preparation method of easily degradable plastic film, and it comprises the following steps:

[0047] Step S1: Grinding the straw to 50 mesh to obtain straw powder.

[0048] Step S2: vacuum-dry the bio-based PBAT biodegradable resin, bio-based PBS biodegradable resin, straw powder, pectin and lignin in a vacuum drying oven, wherein the vacuum drying conditions are a vacuum degree of 500Pa and a temperature of 45°C. Dry for 3 hours under the condition;

[0049] Step S3: Take 0.5L of ethanol and 8L of distilled water and mix evenly to prepare a water-ethanol mixed solvent. Mix well dried 1000g bio-based PBAT biodegradable resin, 1000g bio-based PBS biodegradable resin, 200g straw powder, 300g pectin and 100g lignin, and 400g additives, 3500g water-ethanol mixed solvent prepared above to obtain a mixed material. Wherein, the additive is a mixture of 200g polyphenol and 200g fatty acid ester.

[0050] Step S4: using a twin-screw ...

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Abstract

The invention provides a preparation method of an easily degradable plastic film, and relates to the technical field of preparation of degradable plastic films. The preparation method comprises the following steps: grinding straw to obtain straw powder; carrying out vacuum drying on bio-based PBAT biodegradable resin, bio-based PBS biodegradable resin, the straw powder, pectin and lignin; mixing the dried bio-based PBAT biodegradable resin, bio-based PBS biodegradable resin, straw powder, pectin and lignin, an additive and a water-ethanol mixed solvent to obtain a mixture; extruding and granulating to obtain composite plastic particles; and blowing the film to obtain the easily degradable plastic film. According to the preparation method of the easily degradable plastic film provided by the invention, the mechanical properties of the completely biodegradable film are improved by using the straw powder, pectin, lignin, additive, water-ethanol mixed solvent and six-stage temperature control during extrusion of a twin-screw extruder.

Description

technical field [0001] The invention relates to the technical field of preparation of degradable plastic films, and in particular to a preparation method of easily degradable plastic films. Background technique [0002] In the 21st century, the world economy has entered the era of globalization and informationization. With the development of high-tech plastic film products, environmental issues, resource and energy issues have also become prominent. The requirements for preventing environmental pollution and protecting the ecological environment are also getting higher and higher. In order to maintain the sustainable development of the plastic film market, the relationship between the economy and the environment, resources and energy must be properly handled. To completely solve the increasingly serious "white pollution" caused by plastics, we must start from the source and vigorously develop and promote environmentally degradable plastic film materials. [0003] At present...

Claims

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Application Information

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IPC IPC(8): C08L67/02C08L97/00C08L5/06C08L97/02C08K5/13C08K5/10C08J5/18
CPCC08J5/18C08J2367/02C08J2497/00C08J2405/06C08J2497/02C08J2467/02C08K5/13C08K5/10
Inventor 卢贵宝王玲芳
Owner 卢贵宝