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Production method and application of biodegradable lignocellulose bioplastic

A production method and technology of bioplastics, applied in the field of production and application of biodegradable lignocellulose bioplastics, can solve problems such as waste of resources, and achieve the effects of uniform dispersion, environmentally friendly and efficient methods, and excellent product performance

Pending Publication Date: 2022-08-09
WUHAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Among the by-products of papermaking and biorefining, about 50 million tons of lignin is produced as a by-product of papermaking and biorefining every year, and 95% of them are only used as low-end and cheap fuels, resulting in a serious waste of resources (Bioresources 2014 ,9,1055)

Method used

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  • Production method and application of biodegradable lignocellulose bioplastic
  • Production method and application of biodegradable lignocellulose bioplastic
  • Production method and application of biodegradable lignocellulose bioplastic

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] 7wt% NaOH, 12wt% urea and balance water were prepared into a solvent, pre-cooled to below freezing point, adding cotton linter pulp with a polymerization degree of 500, and stirring to obtain a cellulose solution with a concentration of 4wt%. The calcium lignosulfonate powder is directly added to the above solution, and stirred at below 5° C. until completely dissolved to obtain a lignin / cellulose composite solution. The solution was formed into a film by a casting method and then placed in a 5 wt % acetic acid aqueous solution, and washed to obtain a lignin / cellulose composite hydrogel film. The hydrogel was dried by roll-to-roll hot pressing to obtain a lignin / cellulose composite bioplastic film.

Embodiment 2

[0034] 7wt% NaOH, 12wt% urea and balance water are prepared into a solvent, pre-cooled to below freezing point, wood pulp with a polymerization degree of 600 is added, and a 4wt% cellulose solution is obtained by stirring. The alkaline lignin powder was directly added to the above solution and stirred at 5° C. until completely dissolved to obtain a lignin / cellulose composite solution. The chemical cross-linking agent epichlorohydrin of the same quality as the lignin was slowly added dropwise to the above solution and stirred evenly. Cellulose composite hydrogel membrane. The hydrogel was dried by roll-to-roll hot pressing to obtain a lignin / cellulose composite bioplastic film.

Embodiment 3

[0036] 7wt% NaOH, 12wt% urea and remaining water were prepared into a solvent, pre-cooled to below freezing point, added cotton linter pulp with a degree of polymerization of 500, and stirred vigorously to obtain a cellulose solution with a concentration of 4wt%. The alkaline lignin powder was directly added to the above solution and stirred at 5° C. until completely dissolved to obtain a lignin / cellulose composite solution. A certain amount of cross-linking agent ethylene glycol diglycidyl ether was added and stirred evenly, and after film-forming by casting method, it was immersed in a 5wt% phosphoric acid aqueous solution, and washed to obtain a lignin / cellulose composite hydrogel film. The hydrogel was dried by plate hot pressing to obtain a lignin / cellulose bioplastic.

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Abstract

The invention discloses a production method and application of biodegradable lignin / cellulose bioplastic. The production method comprises the following steps: (1) dissolving cellulose and lignin by using an alkaline aqueous solution; (2) carrying out acid liquor regeneration and in-situ precipitation on cellulose and lignin to obtain a cellulose / lignin composite gel material; and (3) washing and drying the gel at high temperature to obtain the lignin / cellulose bioplastic. The novel lignin / cellulose bioplastic provided by the invention is directly derived from biomass raw materials, and has the characteristics of high toughness, excellent biocompatibility and biodegradability. The novel preparation method is environment-friendly in process and low in cost, and has industrial production and practical application prospects.

Description

technical field [0001] The field of polymer materials and polymer synthesis, specifically relates to a preparation and processing method of a lignin / cellulose plastic substitute. Background technique [0002] People's daily life is inseparable from a wide range of plastic products, such as packaging bags, furniture, utensils, industrial pipes, tools, cars and toys. However, most of the plastic products currently come from petroleum-based polymers, and most of their wastes are difficult to degrade and have low reuse rates. As people's daily life and production rely more and more on plastic products, their waste is increasing day by day. Non-degradable plastic waste not only accumulates in large quantities on land, but also enters lakes, oceans and other water bodies in large quantities, endangering the ecological environment of marine organisms; at the same time, it enters the human food chain through ingestion by animals, posing a huge threat to human health. Therefore, it...

Claims

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Application Information

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IPC IPC(8): C08J5/18C08L1/02C08L97/00
CPCC08J5/18C08J2301/02C08J2497/00Y02W30/62
Inventor 蔡杰胡磊钟奕刘迅
Owner WUHAN UNIV
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