High-strength transparent cellulose material and preparation method thereof
A cellulose and high-strength technology, applied in the field of high-strength transparent cellulose materials and their 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.
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[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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