High-voltage electrostatic field-assisted self-assembly method and product for preparing high-crystalline and high-orientation regenerated cellulose materials

A high-voltage electrostatic field and regenerated cellulose technology is applied in the field of high-voltage electrostatic field-assisted self-assembly to prepare highly crystalline and highly oriented regenerated cellulose materials. The process is simple, the effect of realizing large-area production and broadening the application range

Active Publication Date: 2022-07-01
ZHEJIANG SCI-TECH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the preparation process is relatively complicated, the cost is high, and the degree of orientation cannot be accurately controlled.

Method used

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  • High-voltage electrostatic field-assisted self-assembly method and product for preparing high-crystalline and high-orientation regenerated cellulose materials
  • High-voltage electrostatic field-assisted self-assembly method and product for preparing high-crystalline and high-orientation regenerated cellulose materials

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0037] Take cellulose (viscosity average molecular weight M η =9.72×10 4 ) 4 grams, add 100 grams of 7wt% sodium hydroxide / 12wt% urea mixed aqueous solution (i.e. 7wt% sodium hydroxide, 12wt% urea), stir in an ice-water bath for 10 minutes, then freeze in a refrigerator for 3 hours, Take out and stir well to obtain a colorless and transparent solution. After filtering to remove a small amount of undissolved cellulose, scrape the film on the glass, and place it in a high-voltage electrostatic field. At this time, the electrostatic field voltage is 14kV, and the distance between the positive and negative electrode plates is 15cm. Wash it after the film is formed. Vacuum drying at 40°C to obtain regenerated cellulose material with high crystallinity and high orientation.

Embodiment 2

[0039] Take cellulose (viscosity average molecular weight M η =9.72×10 4 ) 4 grams, add 100 grams of 7wt% / 12wt% alkali urea aqueous solution, stir in an ice-water bath for 10 minutes, then freeze in a refrigerator for 3 hours, take out and stir well to obtain a colorless and transparent solution. After filtering to remove a small amount of undissolved cellulose, scrape the film on the glass and place it in a high-voltage electrostatic field. At this time, the electrostatic field voltage is 16kV, and the distance between the positive and negative electrode plates is 15cm. Wash it after the film is formed. It is a regenerated cellulose material with high crystallinity and high orientation, which is dried under vacuum at 40°C.

Embodiment 3

[0041] Take cellulose (viscosity average molecular weight M η =9.72×10 4 ) 4 grams, add 100 grams of 7wt% / 12wt% alkali urea aqueous solution, stir in an ice-water bath for 10 minutes, then freeze in a refrigerator for 3 hours, take out and stir well to obtain a colorless and transparent solution. After filtering to remove a small amount of undissolved cellulose, scrape the film on the glass and place it in a high-voltage electrostatic field. At this time, the electrostatic field voltage is 18kV, and the distance between the positive and negative electrode plates is 15cm. Wash it after the film is formed. Vacuum drying at 40°C to obtain regenerated cellulose material with high crystallinity and high orientation.

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Abstract

The present invention discloses a method for preparing high-crystal and high-orientation regenerated cellulose material by high-voltage electrostatic field-assisted self-assembly and a product thereof. The method includes the following steps: (1) dissolving cellulose raw materials in a dissolving solution to obtain a cellulose solution; ( 2) Coating the cellulose solution on the substrate, placing it in a high-voltage electrostatic field to dry to form a film; (3) performing post-processing after film forming to obtain the high-crystalline and high-orientation regenerated cellulose material. The invention adopts the high-voltage electrostatic field-assisted self-assembly method, and can accurately and controllably prepare the regenerated cellulose material with high crystallinity and high orientation, and the regenerated cellulose material has obvious high order in structure.

Description

technical field [0001] The invention relates to the technical field of material preparation, in particular to a method and a product for preparing a high-crystalline and high-orientation regenerated cellulose material by high-voltage electrostatic field-assisted self-assembly. Background technique [0002] Natural crystalline polysaccharide, such as cellulose, is a material with excellent properties of biocompatibility, biodegradability and non-toxicity, and has become a research hotspot. However, most of the microstructures of the regenerated cellulose materials prepared in the prior art are disordered or short-range ordered, and their crystallinity and orientation are low, which greatly limits their application. [0003] The Chinese invention patent document with the application number of 201510255365.3 discloses a preparation method of a highly oriented polysaccharide cellulose material, which utilizes the directional temperature field freezing technology to control the g...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08J5/18C08J7/12C08L1/02
CPCC08J5/18C08J7/123C08J2301/02
Inventor 易玲敏钟申洁张佳文蔡英
Owner ZHEJIANG SCI-TECH UNIV
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