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Preparation method of regenerated cellulose material

A technology of regenerated cellulose and cellulose, applied in the production of bulk chemicals, etc., can solve the problems of low elongation at break, reduced tensile strength, reduced strength and modulus of regenerated cellulose film, etc., to achieve improved mechanical properties, High tensile strength and improved elongation at break

Active Publication Date: 2014-11-05
INST OF CHEM CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, due to the large amount of alkali, sulfuric acid and carbon disulfide used in the processing process, it is easy to produce a large amount of toxic gases such as hydrogen sulfide and carbon disulfide, and the waste water is seriously polluted. The development prospects are limited, and it has gradually been eliminated.
The 4-methylmorpholine-N-oxide (NMMO) system has also been industrially produced, and the regenerated cellulose produced by it is named Lyocell fiber, but the solvent in this method is expensive and the recovery technology is harsh
[0005] The mechanical properties of regenerated cellulose materials are related to the solvent system and preparation technology, but generally have the disadvantage of low elongation at break, that is, lack of toughness
In order to overcome the disadvantage of poor toughness, plasticizers are widely used in cellophane industry (production of regenerated cellulose film by viscose method), otherwise the film is brittle and easy to crack, which is difficult to meet the actual use requirements
Plasticizers are small molecules that bleed easily, which is not suitable for applications requiring long-term service
In addition, the use of plasticizers also leads to a rapid decrease in the tensile strength of the film (Zhangwei Jin, Jianqiang Wang et al. Journal of Applied Polymer Science.2012, 125, 704-709), because plasticizers reduce the binding force
The use of elastomer blending is also a route to improve the toughness of regenerated cellulose, that is, adding elastomer polymers to blend with cellulose, but with the increase in elongation at break, the strength and modulus of regenerated cellulose film are also significantly reduced ( Xiaomin Zhang, Jin Zhu et al. Macromolecular Research.2012, vol.20, No.7, pp703-708)

Method used

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  • Preparation method of regenerated cellulose material
  • Preparation method of regenerated cellulose material

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] Add 2g cotton pulp and 23g EmimAc into a 50mL three-necked flask, heat in an oil bath at 80°C, and use mechanical stirring. After stirring for 2 hours, the cellulose is completely dissolved to obtain a clear and transparent cellulose solution. Stop stirring to completely remove the bubbles in the solution.

[0020] Take a small amount of solution and pour it on a pre-prepared glass plate, scrape the cellulose solution in one direction with a film spreader, and spread it on the glass plate to form a uniform film of cellulose solution.

[0021] Take a sink and fill it with enough ethanol. A glass plate covered with a cellulose solution is placed in the water tank, and the cellulose film solidifies and falls off from the glass plate.

[0022] Drying operations used glass plates and a vacuum oven. The cleaned cellulose film was sandwiched between two layers of glass plates, and dried in a vacuum oven until completely dry to obtain a regenerated cellulose film. The prepare...

Embodiment 2

[0025] Add 2g cotton pulp and 23gEmimAc / DMF (11.5gEmimAc, 11.5gDMF) co-solvent into a 50mL three-necked flask, heat in an oil bath at 80°C, and use mechanical stirring. After stirring for 2 hours, the cellulose is completely dissolved to obtain a clear transparent cellulose solution. Stop stirring to completely remove the air bubbles in the solution.

[0026] Take a small amount of solution and pour it on a pre-prepared glass plate, scrape the cellulose solution in one direction with a film spreader, and spread it on the glass plate to form a uniform film of cellulose solution.

[0027] Take a sink and fill it with enough ethanol. A glass plate covered with a cellulose solution is placed in the water tank, and the cellulose film solidifies and falls off from the glass plate.

[0028] Drying operations used glass plates and a vacuum oven. The cleaned cellulose film was sandwiched between two layers of glass plates, and dried in a vacuum oven until completely dry to obtain a r...

Embodiment 3

[0031]Add 2g cotton pulp and 23gEmimAc / DMF (9.2gEmimAc, 13.8gDMF) co-solvent into a 50mL three-neck flask, heat in an oil bath at 80°C, and use mechanical stirring. After stirring for 2 hours, the cellulose is completely dissolved to obtain a clear and transparent cellulose solution. Stop stirring to completely remove the air bubbles in the solution.

[0032] Take a small amount of solution and pour it on a pre-prepared glass plate, scrape the cellulose solution in one direction with a film spreader, and spread it on the glass plate to form a uniform film of cellulose solution.

[0033] Take a sink and fill it with enough ethanol. A glass plate covered with a cellulose solution is placed in the water tank, and the cellulose film solidifies and falls off from the glass plate.

[0034] Drying operations used glass plates and a vacuum oven. The cleaned cellulose film was sandwiched between two layers of glass plates, and dried in a vacuum oven until completely dry to obtain a r...

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Abstract

The invention belongs to the technical field of preparation of a regenerated cellulose material and discloses a preparation method of the regenerated cellulose material. A employed solvent is a carboxylic acid type ionic liquid or is a co-solvent which is composed of the carboxylic acid type ionic liquid and an active-proton-free polar organic solvent, wherein the carboxylic acid type ionic liquid is preferably selected from 1-ethyl-3-methylimidazole acetate, 1-propyl-3-methylimidazole acetate or 1-butyl-3- methylimidazole acetate; an auxiliary solvent is selected from one or more of DMF, DMAc, DMI, DMSO, pyrrodine, acetone, dichloromethane and dichloroethane; and a solidifying agent is preferably selected from alcohol organic solvents. The carboxylic acid type ionic liquid is most preferably selected from the 1-ethyl-3-methylimidazole acetate and the 1-butyl-3-methylimidazole acetate; the auxiliary solvent is most preferably DMF; and the solidifying agent is preferably ethanol; wherein a mass ration of the carboxylic acid type ionic liquid to the auxiliary solvent is 5:5. By means of the preparation method, mechanical performances of a regenerated cellulose product can be significantly improved and environmental pollution can be reduced.

Description

technical field [0001] The invention belongs to the technical field of preparation of regenerated cellulose materials, and in particular relates to a preparation method capable of improving the mechanical properties of regenerated cellulose materials, especially the toughness. Background technique [0002] Cellulose is the most widely distributed and abundant natural polymer in nature. Every year, plants can produce hundreds of billions of tons of cellulose through photosynthesis. Therefore, it can be said that cellulose is an inexhaustible and renewable resource. resource. Cellulose also has many advantages such as complete biodegradation, good biocompatibility, excellent mechanical properties, and easy modification, etc., and has been widely used in industrial production and people's daily life. Due to the characteristics of its own aggregated structure, that is, there are a large number of hydrogen bonds in the molecule and between the molecules, and at the same time it ...

Claims

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Application Information

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IPC IPC(8): C08J3/09C08J7/00C08L1/02
CPCY02P20/54
Inventor 武进徐波涛张军余坚张金明
Owner INST OF CHEM CHINESE ACAD OF SCI
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