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

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Example Embodiment

[0019] Example 1

[0020] The method for preparing a high-strength cellulose-based composite film of this embodiment includes the following steps:

[0021] (0) Pretreatment: Preparation of cellulose suspension, wherein the preparation method using biomass cellulose as raw material is: soaking 200g of paper pulp (bamboo pulp) in water for 1~2h, using mechanical stirring with a rotating speed of less than 100rpm for 2~5h ; Then use an ultra-micro grinder at a rotation speed of 1000~2000rpm, and the gap between the grinding discs is gradually reduced from 2mm to 0μm or even lower, and the pulp is fibrillated by cyclic feeding; finally the dispersion is homogenized by a high-pressure homogenization method. ~30 times, and then a certain degree of rotary evaporation and concentration to obtain a stable cellulose suspension (the pulp concentration is 0.55wt%, the bamboo pulp concentration is 0.48wt%);

[0022] (1) Preparation of casting film: 100mL wood pulp cellulose suspension with a con...

Example Embodiment

[0024] Example 2

[0025] The difference between Example 2 and Example 1 is: (1) Take 100mL 0.55wt% wood pulp cellulose, 0.9g NaIO 4 Add it to an Erlenmeyer flask and react for 64 hours at 25°C under a stirring speed of 300 rpm in the dark, and then centrifuge, wash with deionized water and freeze-dry to obtain the dialdehyde cellulose; the obtained dialdehyde cellulose is put into a 100 mL deionized water In a round bottom flask, the reaction was carried out at 100°C for 2 hours at a stirring speed of 300 rpm. After centrifugation and concentration, an aqueous solution of hyaluronic cellulose was obtained. The concentration was determined to be 3.7 mg / mL, and the recovery rate was 69%.

[0026] (2) Take 30 mL of the dialdehyde cellulose aqueous solution obtained in step (1), add 110 mg of sorbitol and 270 mg of glycerol, and prepare an environmentally friendly cellulose film through the steps of casting on a flat plate, soaking in water, and drying, with a tensile strength of 57.4 ...

Example Embodiment

[0027] Example 3

[0028] The difference between Example 3 and Example 1 is: (1) Take 100 mL of 0.48wt% bamboo pulp cellulose, 0.3g NaIO 4 , 4mL of isopropanol was added to the Erlenmeyer flask and reacted for 48 hours at 45°C and protected from light at a stirring speed of 500 rpm, and then centrifuged, washed with deionized water and freeze-dried to obtain dialdehyde cellulose; In a round-bottom flask of deionized water, the reaction was carried out at 100°C for 2 hours at a stirring speed of 500 rpm. After centrifugation and concentration, an aqueous solution of hyaline dialdehyde cellulose was obtained. The concentration was determined to be 3.9 mg / mL, and the recovery rate was 70%.

[0029] (2) Take 30 mL of the dialdehyde cellulose aqueous solution obtained in step (1), add 120 mg of sorbitol and 180 mg of glycerol, and prepare an environmentally friendly cellulose film through the steps of casting on a flat plate, soaking in water, and drying, with a tensile strength of 66.3 ...

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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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