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Method for preparing cellulose-based composite film with high strength

A cellulose-based, composite film technology, applied in the field of natural polymer materials, can solve the problems of restricting the development and application of functional materials, unable to popularize and use, harsh reaction conditions, etc., and achieves high tensile strength, mild reaction and low cost. Effect

Active Publication Date: 2018-09-04
XIAMEN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] However, due to its highly developed hydrogen bond network and partially crystalline structure, cellulose is insoluble in water and general organic solvents, which greatly limits its development and application as a functional material.
Viscose fiber is the most common in industrial production. Plant cellulose is alkalized, reacted with carbon disulfide, and dissolved in dilute lye to obtain a viscous fiber solution. This series of processing procedures has caused serious pollution to the environment.
As the research progressed, it was found that the systems capable of dissolving cellulose include ionic liquids and NaOH / urea. Due to the poor mechanical properties of the film and other reasons, it cannot be widely used

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] A method for preparing a high-strength cellulose-based composite film of the present embodiment comprises the following steps:

[0021] (0) Pretreatment: prepare cellulose suspension, wherein the preparation method using biomass cellulose as raw material is: soak 200g of paper pulp (bamboo pulp) in water for 1-2 hours, and use a mechanical stirring with a rotation speed of less than 100rpm for 2-5 hours ; Then use the ultra-fine grinding machine at a speed of 1000-2000rpm, and gradually reduce the gap between the grinding discs from 2mm to 0μm or even lower, and carry out fibrillation treatment on the pulp by circulating feeding; finally, use high-pressure homogenization to homogenize the dispersion for 10 ~30 times, and then concentrated by a certain degree of rotary evaporation to obtain a stable cellulose suspension (the pulp concentration is 0.55wt%, and the bamboo pulp concentration is 0.48wt%);

[0022] (1) Prepare casting solution: 100mL concentration is 0.55wt% ...

Embodiment 2

[0025] The difference between embodiment 2 and embodiment 1 is: (1) get 100mL 0.55wt% wood pulp cellulose, 0.9g NaIO 4 Add it into a Erlenmeyer flask, react at 25°C in the dark for 64 hours at a stirring speed of 300 rpm, then centrifuge, wash with deionized water and freeze-dry to obtain dialdehyde cellulose; put the obtained dialdehyde cellulose into a container containing 100 mL of deionized water In a round-bottomed flask, react at 100°C for 2 hours at a stirring speed of 300 rpm, centrifuge and concentrate to obtain a transparent dialdehyde cellulose aqueous solution. The concentration is 3.7 mg / mL, and the recovery rate is 69%.

[0026] (2) Get the dialdehyde cellulose aqueous solution 30mL that step (1) gained, add sorbitol 110mg and glycerin 270mg, make environmental protection cellulose film by processes such as casting, immersion, drying on flat plate, its tensile strength is 57.4MPa.

Embodiment 3

[0028] The difference between embodiment 3 and embodiment 1 is: (1) get 100mL 0.48wt% bamboo pulp cellulose, 0.3g NaIO 4 , 4mL of isopropanol was added to the Erlenmeyer flask, under the stirring speed of 500rpm at 45°C and protected from light for 48h, then centrifuged, washed with deionized water and freeze-dried to obtain dialdehyde cellulose; the obtained dialdehyde cellulose was put into In a round bottom flask with deionized water, react at 100°C for 2 hours at a stirring speed of 500rpm, centrifuge and concentrate to obtain a transparent dialdehyde cellulose aqueous solution. The concentration is 3.9mg / mL, and the recovery rate is 70%.

[0029] (2) Get 30 mL of the dialdehyde cellulose aqueous solution gained in step (1), add 120 mg of sorbitol and 180 mg of glycerol, and make an environmentally friendly cellulose film by casting, soaking, and drying on a flat plate, and its tensile strength is 66.3 MPa.

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Abstract

The invention discloses a method for preparing cellulose-based composite film with high strength. The method comprises the steps that cellulose, IO4-donor are added into deionized water, then a certain amount of isopropanol, phenol or benzenediol are added, light avoiding reaction is carried out to prepare dialdehyde cellulose, then a transparent dialdehyde cellulose aqueous solution is prepared,sorbitol and glycerinum are added into the aqueous solution, and cellulose film is prepared through the processes of casting, soaking and drying processes on a flat plate. The method for preparing thecellulose-based composite film with the high strength has the advantages that cheap wood pulp, bamboo pulp, cotton and other biomass cellulose serve as cellulose suspension liquid raw materials, theuse value of biomass waste is fully improved, and a new prospect for the application of the cellulose as a packing material and a functional material is opened up.

Description

technical field [0001] The invention belongs to the field of natural polymer materials, and in particular relates to a preparation method of a high-strength cellulose-based composite film. Background technique [0002] With the rapid consumption of fossil fuels and the ensuing environmental pollution, people are gradually focusing on the development and utilization of renewable energy, especially the development and utilization of high-performance materials. Cellulose is the most common and cleanest polymer on the earth. It has unique physical and chemical properties, such as wide source, renewable, good biocompatibility, and low price, which makes people interested in the development of cellulose-based materials, such as fiber Plain-based composite film dressings, food shells and films have generated great interest, which has important practical significance for the utilization of renewable energy and the improvement of the ecological environment. [0003] However, due to ...

Claims

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Application Information

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IPC IPC(8): C08L1/04C08K5/053C08J5/18C08B15/02
CPCC08B15/02C08J5/18C08J2301/04C08K5/053
Inventor 曾宪海闫贵花孙勇唐兴雷廷宙林鹿
Owner XIAMEN UNIV
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