Method for preparing biodegradable transparent film by using waste wood biomass

A woody biomass and transparent film technology, applied in the field of biodegradable transparent films, can solve problems such as shortage of environment, difficult degradation, pollution, etc., and achieve the effects of low cost, solving environmental pollution, and wide source of raw materials

Active Publication Date: 2021-04-23
HUNAN UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] In order to overcome the shortcomings of the existing petroleum-based polymer materials that are difficult to degrade, and better solve a series of problems such as energy shortage and environmental pollution, the present invention discloses a biodegradable biodegradable material prepared from waste woody biomass with simple process, environmental friendliness and excellent performance. Method for biodegrading transparent films

Method used

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  • Method for preparing biodegradable transparent film by using waste wood biomass
  • Method for preparing biodegradable transparent film by using waste wood biomass
  • Method for preparing biodegradable transparent film by using waste wood biomass

Examples

Experimental program
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Effect test

Embodiment 1

[0039] Wash and dry the discarded corn stalks with distilled water, and crush them into powder; weigh 20g of corn stalk powder and add it to a Soxhlet extractor, extract with absolute ethanol for 6 hours to dewax the powder, and then dry it in an oven at 60°C Add the above-mentioned dried corn stalk powder into the reactor, mix it with 8% methanesulfonic acid aqueous solution with 600mL mass fraction, carry out pre-hydrolysis for 4 hours under the heating condition of 80°C, filter, wash, dry and add to In another reaction vessel, add 240mL mass fraction and be 2.0% Na 2 SO 3Add 10mL of 20% NaOH solution to the aqueous solution, stir and heat in an oil bath at 100°C for 1 hour, filter the mixture after the reaction, wash the filter residue with water until it is neutral, and then dry it to obtain cellulose. Grind the above-mentioned dried cellulose into powder, weigh 5g and pour it into another reactor, add 35mL of glacial acetic acid, put it in an oil bath at 50°C for 3 hours...

Embodiment 2

[0041] Wash and dry the discarded rice straw with distilled water, and crush it into powder; weigh 30g of rice straw powder and put it into a Soxhlet extractor, extract with absolute ethanol for 6 hours to dewax the powder, and then dry it in an oven at 60°C; Add the above dried rice straw powder into the reactor, mix it with 450mL of 4% methanesulfonic acid aqueous solution, pre-hydrolyze it at 120°C for 2 hours, filter it, wash it, dry it and add it to another reaction In the container, add 290mL of Na with a mass fraction of 1.0% 2 SO 3 Add 10 mL of NaOH solution with a mass fraction of 20% to the aqueous solution, stir and heat in an oil bath at 120°C for 1 hour, filter the mixture after the reaction, wash the filter residue with water until it is neutral, and then dry it to obtain cellulose. Grind the above dried cellulose into powder, weigh 10g and pour it into another reactor, add 100mL of glacial acetic acid, put it in an oil bath at 60°C for 2 hours, then add 50mL of...

Embodiment 3

[0043] Wash and dry the discarded bamboo with distilled water, and crush it into powder; weigh 30g of bamboo powder and add it to a Soxhlet extractor, extract with absolute ethanol for 6 hours to dewax the powder, and then dry it in an oven at 60°C; The above dried bamboo powder was added to the reactor, mixed with 500mL of 4% methanesulfonic acid aqueous solution, heated at 100°C for 3 hours, then filtered, washed, dried and then added to another reaction In the container, add 290mL of Na with a mass fraction of 1.5% 2 SO 3 Add 10mL of 20% NaOH solution to the aqueous solution, stir and heat in an oil bath at 100°C for 1 hour, filter the mixture after the reaction, wash the filter residue with water until it is neutral, and then dry it to obtain cellulose. Grind the above dried cellulose into powder, weigh 10g and pour it into another reactor, add 120mL of glacial acetic acid, put it in an oil bath at 50°C for 3 hours, then add 40mL of acetic anhydride and 0.2g of sulfuric a...

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Abstract

The invention discloses a method for preparing a biodegradable transparent film by using waste wood biomass. The method comprises the following steps: cleaning, drying and crushing the waste wood biomass into powder, extracting and dewaxing with absolute ethyl alcohol, mixing with a methanesulfonic acid aqueous solution for prehydrolysis after drying, mixing with alkaline Na2SO3 for reaction after filtering, washing and drying, and filtering, washing and drying to obtain cellulose; then adding a mixture of acetic acid and acetic anhydride, carrying out oil bath heating reaction by taking sulfuric acid as a catalyst, then centrifuging, adding water into supernatant to separate out precipitates, filtering, washing, drying and partially hydrolyzing to obtain cellulose acetate; mixing with a plasticizer, an anti-reflection agent and a solvent, stirring, standing and defoaming to obtain a cellulose acetate transparent solution; forming a film through a dry phase inversion technology after the template is coated; and stripping the film from the template to obtain the cellulose acetate transparent film product. According to the method, the research process of high-value utilization of biomass resources is promoted, and a new way is opened up for solving the problems of white pollution and the like.

Description

technical field [0001] The invention relates to the preparation of films, in particular to a method for preparing biodegradable transparent films by utilizing waste woody biomass. Background technique [0002] Polymer functional materials synthesized from fossil resources (coal, oil, natural gas) are generally difficult to degrade, and will become "white pollution" after being discarded, which brings great harm to the environment. With the development of environmental protection technology and the promotion of green environmental protection in society, the problem of white pollution has been paid more and more attention by people. In order to better solve a series of problems such as resource shortage and environmental pollution, people began to seek alternatives to fossil resources. Biomass materials are characterized by abundant resources, wide range of sources, renewable and biodegradable, and are considered as a potential fossil alternative resource. Cellulose acetate ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08J5/18C08L1/12
CPCC08J5/18C08J2301/12
Inventor 袁正求朱红艳金灿龙润芝曾邹果李明劼李晓艳周虎
Owner HUNAN UNIV OF SCI & TECH
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