A kind of preparation method of highly oriented cellulose film

A technology of cellulose film and high orientation, which is applied in the direction of flat products, bulk chemical production, and other household appliances. It can solve the problems of inaccurate control of orientation degree, poor toughness of cellulose film, complicated preparation process, etc., and achieve easy operation , controllable degree of orientation, simple process

Active Publication Date: 2019-07-12
QINGDAO UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

This method successfully prepares highly oriented fiber membranes, but the preparation process is relatively complicated, consumes a lot of energy, and the degree of orientation cannot be accurately controlled.
[0007] Although there are related technologies that improve the performance of cellulose films by orienting them, due to the poor toughness and low elongation at break of cellulose films, there is no technology that can achieve high orientation of cellulose films and effectively control the degree of orientation. control

Method used

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  • A kind of preparation method of highly oriented cellulose film

Examples

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Comparison scheme
Effect test

Embodiment 1

[0049] a. Preparation of cellulose hydrogel film: Prepare 100g of sodium hydroxide / urea / water solution according to the mass ratio of 6.5:11.5:82, place it in -15°C environment for pre-cooling for 3 hours, and then put 3g of cellulose into In the prepared solution, stir at high speed for 5 minutes to obtain a transparent cellulose solution, and then the product is centrifuged by a centrifuge to remove insoluble matter and air bubbles to obtain a cellulose solution with a mass fraction of 3%; the cellulose solution is coated on Keep the glass plate at 20°C for 3 hours, then immerse it in a coagulation bath for regeneration, and wash it with deionized water for 3-4 times to obtain a cellulose hydrogel film;

[0050]B. Plasticization of cellulose hydrogel film: immerse cellulose hydrogel film in plasticizing bath to carry out plasticization, and described plasticizing bath is made up of ionic liquid and deionized water, and mass ratio is 3:97, in Soak at 60°C for 16 hours, then p...

Embodiment 2

[0053] The types of materials used and the process flow are the same as in Example 1, except that the ionic liquid is used as the solvent, and 5 g of cellulose is added to the ionic liquid (the cation is an alkylimidazolium ion, and the anion is a chloride ion) and stirred and dissolved at 90 ° C to obtain a mass fraction of 5% cellulose solution was coated on a glass plate to form a film, and then a cellulose film with a draw ratio of 1.2 was prepared. The degree of orientation of the obtained oriented film was 1.11, the tensile strength was 111 MPa, and the modulus was 7.5 GPa.

Embodiment 3

[0055] The types of materials used and the process flow are the same as in Example 1, except that the mass ratio of ionic liquid and deionized water in the plasticizing bath is 7:93, and the film is taken out after soaking at room temperature for 18h, and then placed in Fix and dry on a plexiglass plate to obtain a plasticized cellulose film. Subsequently, the same method was used to prepare a cellulose film with a stretch ratio of 1.4, a degree of orientation of 1.32, a tensile strength of 127 MPa, and a modulus of 8.7 GPa.

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Abstract

The invention relates to a preparation method of a highly-oriented cellulose film, belonging to the technical field of material preparation. The preparation method comprises the following steps: preparing a cellulose film, plasticizing the prepared film by using an ionic liquid, carrying out oriented stretching, fixing, and removing the plasticizer in the stretched state, thereby obtaining the highly-oriented cellulose film. Abundant natural resources are fully utilized, so the cost is low. The method is simple to operate, and does not add any harmful substance; and the used plasticizer ionic liquid is stable in water and air, thereby being beneficial to environmental protection; and the method enhances the degree of orientation and strength of the cellulose film and widens the application range of the cellulose film.

Description

[0001] 【Technical field】 [0002] The invention relates to a preparation method of a highly oriented cellulose film, belonging to the technical field of material preparation. [0003] 【Background technique】 [0004] The application of degradable materials is an important and effective method to solve the problem of environmental pollution. Cellulose has many advantages such as biocompatibility, biodegradability, thermal stability and chemical stability, and can be used as an ideal environmental protection material in many fields such as food and packaging. However, the cellulose film prepared by the prior art is easy to be brittle, and the mechanical strength is low, only 30-70 MPa. [0005] The Chinese invention patent with application number 201110347908.6 discloses a method for preparing a regenerated cellulose film. The regenerated cellulose film obtained by the method has good softness and high tensile strength. However, the preparation process is relatively cumbersome, ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08L1/02C08J7/02C08J5/18B29C69/00B29C55/02B29L7/00
CPCB29C55/02B29C69/00B29L2007/00C08J5/18C08J7/02C08J2301/02C08L1/02C08L2201/06C08L2201/10C08L2203/16Y02P20/54
Inventor 张建明刘晓婷段咏欣张同平
Owner QINGDAO UNIV OF SCI & TECH
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