Method for rapidly and continuously preparing high-toughness natural polymer bioplastics

A technology for natural polymers and bioplastics, which is applied in the field of rapid and continuous preparation of high-toughness natural polymer bioplastics, and can solve the problems of stubborn cellulose or chitin molecules, inability to large-scale continuous production, and difficulty in melting or dissolving. , to achieve the effect of good mechanical properties, low cost and excellent product performance

Inactive Publication Date: 2021-03-30
WUHAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the development and production of cellulose, chitin, and chitosan bioplastics still face enormous challenges. First, cellulose or chitin molecules are extremely stubborn and difficult to melt or dissolve. Although chitosan has long been found to be soluble In acidic solution, but large-scale use of strong acidic solution for production may cause serious safety and environmental problems
[0003] Although it is an environmentally friendly and convenient method to obtain high-performance cellulose bioplastics (patent 201010235233.1) by treating cellulose hydrogel with flat-plate hot pressing, it can only be produced intermittently and cannot be produced continuously on a large scale. The size of the plastic is limited by the size of the flatbed heat press

Method used

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  • Method for rapidly and continuously preparing high-toughness natural polymer bioplastics
  • Method for rapidly and continuously preparing high-toughness natural polymer bioplastics
  • Method for rapidly and continuously preparing high-toughness natural polymer bioplastics

Examples

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Effect test

Embodiment 1

[0030] Prepare 7wt% NaOH, 12wt% urea and the rest of water as a solvent, add cotton linter pulp with a degree of polymerization of 500, stir and freeze overnight below freezing point, stir and thaw to obtain a cellulose solution with a concentration of 2wt%. After degassing, the solution was cast on the surface of a glass plate, and then directly immersed in ethanol for regeneration for 2 hours, and washed with deionized water to obtain a cellulose hydrogel. This hydrogel was substituted with ethanol to obtain a cellulose ethanol gel. The hydrogel was carried out as figure 1 The shown roll-to-roll thermocompression drying yields cellulosic bioplastics.

Embodiment 2

[0032]Prepare 7wt% NaOH, 12wt% urea and the rest of water as a solvent, add bamboo pulp with a degree of polymerization of 800, stir and freeze overnight below freezing point, and obtain a cellulose solution with a concentration of 2wt% after stirring and thawing. Add epichlorohydrin at -15~25°C according to the molar ratio of crosslinking agent to cellulose is 4:1, stir evenly and put it in the mold for 12 hours to obtain a partially chemically crosslinked cellulose gel, then The gel was placed in 75% ethanol aqueous solution for regeneration at room temperature, and washed with water until neutral after 2 hours to obtain a transparent cellulose hydrogel. The hydrogel is directly frozen at -20°C and then freeze-dried to obtain the cellulose airgel. The airgel is carried out as figure 1 The shown roll-to-roll thermocompression drying yields crosslinked cellulose bioplastics.

Embodiment 3

[0034] Prepare a solvent with 7wt% NaOH, 12wt% urea and the rest of water, add cotton linter pulp with a degree of polymerization of 500, stir and freeze overnight below freezing point, stir and thaw to obtain a cellulose solution with a concentration of 4wt%. Add epichlorohydrin at -15~25°C according to the molar ratio of crosslinking agent to cellulose is 4:1, stir evenly and put it in the mold for 12 hours to obtain a partially chemically crosslinked cellulose gel, then The gel was placed in 75% ethanol aqueous solution for regeneration at room temperature, and washed with water until neutral after 2 hours to obtain a transparent cross-linked cellulose hydrogel. The hydrogel was carried out as figure 1 The shown roll-to-roll thermocompression drying yields crosslinked cellulose bioplastics.

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Abstract

The invention discloses a rapid and continuous preparation method of high-toughness natural polymer bioplastic. The preparation method comprises the following steps: preparing a natural polymer gel material by utilizing a natural polymer solution; and carrying out roller-to-roller hot pressing treatment on the gel to obtain the corresponding bioplastic. According to the processing method, continuous and rapid production of the non-thermoplastic natural polymer bioplastic is realized, and molecular chains in the prepared bioplastic are oriented and arranged in a plane, so that the toughness ofthe plastic is greatly improved; and the novel processing method is green and environment-friendly in process, low in cost and excellent in product performance, is a major breakthrough to the prior art, is suitable for industrial production and practical application, and has a wide application prospect.

Description

technical field [0001] The invention belongs to the field of polymer materials and polymer processing, in particular to a method for rapidly and continuously preparing high-toughness natural polymer bioplastic products. Background technique [0002] Plastic pollution, especially non-degradable plastic waste, marine microplastics, and highly toxic additives escaping from plastics, poses a huge global threat to marine ecosystems (Science 2018, 359, 460.). However, plastic recycling is often costly and energy intensive (J. Am. Chem. Soc. 2015, 137, 14019). Therefore, it is particularly urgent to develop environmentally degradable bioplastics that have excellent mechanical properties, good thermal and chemical stability, are cheap, and are easy to mass-produce, but there are many difficulties. Cellulose and chitin are both naturally biosynthesized polysaccharides, which are the most abundant renewable resources on earth, and are both biodegradable and biocompatible. Chitosan i...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08J3/00C08J3/24C08J3/075C08J3/09C08J9/28C08J9/36C08K3/04C08L1/02C08L5/08
CPCC08J3/00C08J3/24C08J3/075C08J3/095C08J9/28C08J9/36C08J2301/02C08J2305/08C08J2201/048C08K3/042
Inventor 蔡杰胡磊许多铎钟奕卫平东张俐娜
Owner WUHAN UNIV
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