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Gel cellulose compound film and preparation method thereof

A technology of gelling cellulose and cellulose film, which is applied in the field of composite materials, can solve the problems of low mechanical strength of cellulose materials, and achieve the effect of reducing production costs

Active Publication Date: 2017-12-01
TIANJIN UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Although the method of dissolving cellulose first can prepare cellulose materials with better transparency and uniformity, the prepared cellulose materials still have the disadvantage of low mechanical strength.

Method used

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  • Gel cellulose compound film and preparation method thereof
  • Gel cellulose compound film and preparation method thereof

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preparation example Construction

[0028] The invention provides a kind of preparation method of gel cellulose composite membrane, comprises the following steps:

[0029] 1) Dissolving cellulose in an alkali solution to obtain a cellulose solution;

[0030] 2) performing defoaming treatment on the cellulose solution to obtain a defoamed cellulose solution;

[0031] 3) forming a film of the defoamed cellulose solution on the substrate to obtain a wet cellulose film;

[0032] 4) coagulating the wet fiber membrane in a coagulation bath to obtain a cellulose gel membrane;

[0033] 5) freeze-drying the cellulose gel film to obtain a solid cellulose film;

[0034] 6) The solid cellulose membrane is loaded with PHBH in a PHBH solution to obtain a PHBH-cellulose composite membrane, and the PHBH solution is a mixture of poly(3-hydroxybutyrate-3-hydroxyhexanoate) and an organic solvent liquid;

[0035] 7) Carrying out hot-pressing treatment on the PHBH-cellulose composite membrane to obtain a gelled cellulose composi...

Embodiment 1

[0069] (1) Prepare a mixed aqueous solution with a sodium hydroxide content of 7wt% and a urea content of 12wt%. Dissolve 3g of cotton cellulose in 97g of a mixed aqueous solution, freeze for 4 hours at -20°C and mechanically stir until the cellulose Dissolve completely, obtain the cellulose solution that concentration is 3wt%;

[0070] (2) centrifuging the cellulose solution to obtain a defoamed cellulose solution;

[0071] (3) Pour the obtained degassed cellulose solution evenly on a glass plate, and place it horizontally for 30 minutes to obtain a wet cellulose film with a thickness of 70 μm;

[0072] (4) taking out the obtained wet cellulose film after coagulating in a methanol coagulation bath for 30min to obtain a cellulose gel film;

[0073] (5) Pre-freeze the cellulose gel film in a refrigerator at -20°C for 10 hours, freeze it in a freeze dryer at -55°C for 10 hours, and keep the temperature and humidity at 30°C and 65% for 4 hours to obtain solid fibers plain film;...

Embodiment 2

[0077] (1) Prepare a mixed aqueous solution with a sodium hydroxide content of 5wt% and a urea content of 10wt%. Dissolve 6g of wood pulp cellulose in 94g of a mixed aqueous solution, freeze at -10°C for 6h, and mechanically stir until the fibers The element dissolves completely, and obtaining concentration is the cellulose solution of 6wt%;

[0078] (2) centrifuging the cellulose solution to obtain a defoamed cellulose solution;

[0079] (3) Pour the obtained degassed cellulose solution evenly on a glass plate, and place it horizontally for 60 minutes to obtain a wet cellulose film with a thickness of 40 μm;

[0080] (4) taking out the obtained wet cellulose film to obtain the cellulose gel film after coagulating in a methanol aqueous coagulation bath for 90 min;

[0081] (5) Pre-freeze the cellulose gel film in a refrigerator at -10°C for 15 hours, freeze it in a freeze dryer at -60°C for 15 hours, and keep the temperature and humidity at 25°C and 60% for 8 hours to obtain ...

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Abstract

The invention belongs to the technical field of composite materials and provides a preparation method of a gel cellulose compound film. The preparation method comprises the following steps: dissolving cellulose in an alkaline solution to obtain a cellulose solution, performing defoaming treatment, substrate film forming, solidification in a solidification bath and freezing and drying to obtain a solid cellulose film; and loading PHBH on the obtained solid cellulose film in a PHBH solution to obtain a PHBH-cellulose compound film, and performing hot pressing to obtain the gel cellulose compound film. According to the preparation method provided by the invention, the production cost of the compound film can be reduced, the prepared gel cellulose compound film is compact in structure and has a good mechanical property, the air permeability is reduced effectively, and the gel cellulose compound film can be fully degraded in a natural condition and is environmentally friendly.

Description

technical field [0001] The invention relates to the technical field of composite materials, in particular to a gel cellulose composite membrane and a preparation method thereof. Background technique [0002] As the most abundant natural polymer in nature, cellulose has the advantages of low cost, environmental friendliness, high biocompatibility and biodegradability, and is expected to replace petroleum in many fields such as daily life, food, medicine, and materials. Chemical Products. [0003] Cellulose can not only be chemically modified to generate cellulose derivatives, but also can be directly used to prepare cellulose-based materials without derivatization. However, if you want to prepare cellulose-based materials with higher performance (high mechanical strength, high transparency, high uniformity), such as cellulose films, fibers, aerogels, etc., the best way is to first process the cellulose Derivative dissolution, under this premise, the cellulose dissolution sy...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08L1/02C08L67/04C08J5/18
CPCC08J5/18C08J2301/02C08J2367/04C08J2401/02C08J2467/04C08L1/02C08L67/04C08L2201/06C08L2203/16
Inventor 马晓军张雪姣周娇李军然朱礼智于丽丽
Owner TIANJIN UNIV OF SCI & TECH
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