Process for preparing regenerated cellulose films and wires

A technology of cellulose film and cellulose solution, applied in coating and other directions, can solve problems such as difficulty in realizing industrialization, and achieve the effects of less consumption of raw materials, short production cycle and good mechanical properties

Inactive Publication Date: 2004-11-17
WUHAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, this solvent system must be 3-5 hours under freezing conditions to dissolve cellulose to prepare a transparent cellulose concentrated solution, so it is difficult to realize industrialization

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0011] Take 4.1 g of cotton linter cellulose pulp (polymerization degree 500), add 200 g of 7.8 wt% NaOH / 10 wt% urea mixed aqueous solution precooled to -8°C, stir at room temperature for 2 minutes, and the cellulose is completely dissolved. Centrifuge at 10,000 rpm at 15° C. for 30 minutes with an ultracentrifuge to degas it to obtain a transparent cellulose solution. Use a glass tube with copper wires (diameter 0.5mm) tied at both ends to scrape the film on the glass plate and immediately put 1-3wt% HCl aqueous solution (or 1-2mol / L HAc aqueous solution, or 3-6wt% H 2 SO 4 aqueous solution, or 5wt% H 2 SO 4 / 5~20wt%Na 2 SO 4 (aqueous solution) coagulate and regenerate for 2 to 5 minutes, take it out, and rinse with water. Finally, it was pasted on a plexiglass plate and dried naturally to obtain a regenerated cellulose film.

Embodiment 2

[0013] Take 20 g of viscose staple fiber (polymerization degree 300), add 180 g of 5.5 wt % NaOH / 8 wt % urea mixed aqueous solution precooled to -8 ° C, stir at room temperature for 10 minutes, and the cellulose is completely dissolved. Centrifuge at 10,000 rpm at 15° C. for 30 minutes with an ultracentrifuge to degas it to obtain a transparent cellulose solution. Through the syringe needle (diameter 0.3mm) into 1 ~ 3wt% HCl aqueous solution (or 1 ~ 2mol / L HAc aqueous solution, or 3 ~ 6wt% H 2 SO 4 aqueous solution, or 5wt% H 2 SO 4 / 5~20wt%Na 2 SO 4 Aqueous solution), coagulated and regenerated, taken out, rinsed with water, and dried naturally to obtain regenerated cellulose filaments.

Embodiment 3

[0015] Take 8.4 g of cotton linter cellulose pulp (500 degree of polymerization), add 200 g of 7.5 wt% NaOH / 12 wt% urea mixed aqueous solution precooled to -8°C, stir at room temperature for 2 minutes, and the cellulose is completely dissolved. Centrifuge at 10,000 rpm at 15° C. for 30 minutes with an ultracentrifuge to degas it to obtain a transparent cellulose solution. Use a glass tube with copper wires (diameter 0.5mm) tied at both ends to scrape the film on the glass plate and immediately put 1-3wt% HCl aqueous solution (or 1-2mol / L HAc aqueous solution, or 3-6wt% H 2 SO 4 aqueous solution, or 5wt% H 2 SO 4 / 5~20wt%Na 2 SO 4 (aqueous solution) coagulate and regenerate for 2 to 5 minutes, take it out, and rinse with water. Finally, it was pasted on a plexiglass plate and dried naturally to obtain a regenerated cellulose film. With 3wt% HCl aqueous solution, 2mol / L HAc aqueous solution, 5wt% H 2 SO 4 aqueous solution and 5wt% H 2 SO 4 / 10wt%Na 2 SO 4 The serial ...

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Abstract

The invention discloses a method for manufacturing cellulose film and silk. The cellulose is dissolved in mixed liquid 5-12wt% natrium oxyhydrogen and 8-20wt% ureophil, gets the cellulose liquid, then carries on film scratching and silk spraying to the cellulose, they are solidified in the solidifying bath, then the regenerated cellulose film and silk will be got after being cleaned. The cellulose thick liquid has excellent fiber textile performance and compactibiity of film, the regenerated cellulose has excellent light transmission and mechanical performance, the silk also has good mechanical performance. The method can obtain cellulose thick liquid by dissolving cellulose in room temperature. It has no contamination and its price is low, it is a kind of green manufacturing process.

Description

technical field [0001] The invention relates to a method for preparing regenerated cellulose film and silk, which belongs to the field of natural polymers, and also belongs to the fields of chemistry, agriculture and environmental engineering. Background technique [0002] Plant cellulose is the most abundant renewable resource on the earth. It is an environmentally friendly polymer material and is expected to become one of the main chemical raw materials in the 21st century. However, cellulose is far from being fully utilized in the chemical industry at present, mainly because the cellulose dissolution process in the existing process is complicated, costly and polluting. At present, more than 90% of regenerated cellulose products are still produced by the traditional viscose method, and the cellulose is mixed with CS under the action of strong alkali (sodium hydroxide concentration 18%) 2 The reaction produces cellulose xanthate, which dissolves in alkali solution and beco...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B29C41/12C08J5/02C08J5/18
Inventor 张俐娜蔡杰周金平
Owner WUHAN UNIV
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