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High-strength transparent cellulose material and preparation method thereof

A cellulose, high-strength technology, applied in the field of high-strength transparent cellulose materials and its preparation, can solve problems such as complex processes, and achieve the effects of simple process, high tensile strength and fracture growth rate, and easy industrialization

Active Publication Date: 2010-11-10
WUHAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, this manufacturing process requires the treatment of millimeter or micron-scale plant cellulose into nanoscale, the process is complicated, and the obtained nanofiber paper needs to be polished to obtain a transparent material (the light transmittance under 600nm visible light before polishing only 20%)

Method used

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Effect test

preparation example Construction

[0015] The preparation method of the above-mentioned high-strength transparent cellulose material: it is obtained by hot-pressing cellulose hydrogel, cellulose organogel or cellulose aerogel; the cellulose hydrogel is regenerated from a cellulose solution; the Cellulose organogel is obtained by substituting water with a low-boiling point, volatile organic solvent from cellulose hydrogel; the cellulose aerogel is obtained by supercritical drying and normal pressure Obtained by drying or freeze-drying to remove the liquid medium.

[0016] During hot pressing, the time required is longer at lower temperatures; on the other hand, during hot pressing, the pressure is gradually increased. Considering the efficiency, the hot pressing process can be carried out at a temperature of 30-200°C and a pressure of 10-160Mpa.

[0017] In the present invention, cellulose hydrogel is that cellulose is dissolved in lithium chloride / N, N-dimethylacetamide (LiCl / DMAC), N-methylmorpholine-N-oxide ...

Embodiment 1

[0020] Freeze the solvent system composed of 6-8wt% NaOH, 10-14wt% urea and the rest of water to -12--13°C, dissolve the cellulose, and regenerate the obtained 4wt% cellulose solution to obtain a 4mm thick Cellulose hydrogel. The cellulose hydrogel was kept at 110° C., and the pressure was gradually increased to 60 MPa within 4 hours. The obtained cellulose material has a tensile strength of 106 MPa, an elongation at break of 30%, and a light transmittance of 82% at 600 nm.

Embodiment 2

[0022] Freeze the solvent system composed of 6-8wt% NaOH, 10-14wt% urea and the rest of water to -12--13°C, dissolve the cellulose, and regenerate the obtained 4wt% cellulose solution to obtain a 4mm thick Cellulose hydrogel. The water in the cellulose hydrogel is replaced by methanol to obtain the cellulose organogel. The cellulose organogel was kept at 110° C., and the pressure was gradually increased to 60 MPa within 30 minutes. The obtained cellulose material has a tensile strength of 96 MPa, an elongation at break of 24%, and a light transmittance of 79% at 600 nm.

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Abstract

The invention discloses a transparent high-strength fiber material. The preparation method comprises the following steps that: cellulose is dissolved in NaOH-urea aqueous solution or LiOH-urea aqueous solution which is pre-cooled at low temperature to obtain a cellulose solution, and different thicknesses of cellulose hydrogels are prepared by the cellulose solution; water in the cellulose hydrogel is replaced into an organic solvent to obtain a cellulose organic gel; the cellulose hydrogel or the cellulose organic gel is subject to supercritical drying, ambient pressure drying or freeze drying to remove a liquid medium so as to obtain a cellulose aerogel; and the cellulose hydrogel, the organic gel or the aerogel are autoclaved at a temperature of 30-200 DEG C under the pressure of 10-160Mpa to obtain the high-strength transparent cellulose material. The cellulose material prepared by the invention has excellent mechanical properties, thermal stability and optical permeability.

Description

technical field [0001] The invention relates to a high-strength transparent cellulose material and a preparation method thereof, belonging to the field of polymer materials. Background technique [0002] Cellulose, the most abundant renewable resource on earth, has good biocompatibility and excellent tensile strength. The production of regenerated cellulose fibers, cellophane, and non-woven fabrics from cellulose through the viscose method has been widely used. The theoretical macroscopic modulus of elasticity of cellulose (128GPa) is higher than that of aluminum (70GPa) and glass fiber (76GPa), and its theoretical ultimate tensile strength (17.8GPa) is more than seven times that of iron. The development of new high-strength cellulose materials has attracted more and more attention. Recently, it has been reported to use natural cellulose to prepare a low thermal diffusivity (0.1ppm k -1 ) of foldable transparent nanofiber paper [Adv. Mater. 2009, 21, 1595-1598]. This nan...

Claims

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Application Information

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IPC IPC(8): C08L1/02C08J3/075C08J9/28
CPCD01D1/02D01F2/00
Inventor 蔡杰王其洋张俐娜
Owner WUHAN UNIV
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