METHOD FOR PREPARING NANOCELLULOSE

• US 20190309477A1
• Filed: 10/04/2018
• Published: 10/10/2019
• Est. Priority Date: 04/06/2018
• Status: Active Grant

• Current Assignee: LG Electronics, Inc. (LG Corporation)
• Original Assignee: LG Electronics, Inc. (LG Corporation)
• Inventors: LEE, Misun, KANG, Eunseck, PARK, Koun, LEE, Dongwook, JUNG, Kyungho
• Granted Patent: US 11,193,239 B2
• Time in Patent Office: Days
• CPC Class Codes: D21B 1/14 Disintegrating in mills
• CPC Class Codes: D21C 11/0007 Recovery of by-products, i.e. compounds other than those necessary for pulping, for multiple uses or not otherwise provided for volatile compounds obtained by decomposition of spent liquors in order to regenerate them D21C11/125; compounds obtained by fractionating the liquors in order to regenerate them D21C11/0042
• CPC Class Codes: D21C 3/02 with inorganic bases or alkaline reacting compounds, e.g. sulfate processes
• CPC Class Codes: D21C 3/20 with organic solvents or in solvent environment
• CPC Class Codes: D21C 9/004 inorganic compounds
• CPC Class Codes: D21C 9/007 by mechanical or physical means
• CPC Class Codes: D21D 1/00 Methods of beating or refining; Beaters of the Hollander type knotter screens D21F
• CPC Class Codes: D21H 11/18 Highly hydrated, swollen or fibrillatable fibres
• CPC Class Codes: D21H 11/20 Chemically or biochemically modified fibres

Abstract

A method according to the present disclosure may includes preparing a urea solution by dissolving urea in distilled water, adding phosphoric acid to the urea solution, adding pulp to the solution in which urea and phosphoric acid are dissolved, heating the solution such that the urea and the phosphoric acid each react with the pulp and preparing nanocellulose by washing the pulp which is completely reacted, and then grinding the pulp, in which a weight of the phosphoric acid is 10 to 50% based on a weight of the pulp.

Claims

1. A method for preparing nanocellulose, the method comprising:

preparing a urea solution by dissolving urea in distilled water;

adding phosphoric acid to the urea solution;

adding pulp to the solution in which urea and phosphoric acid are dissolved;

heating the solution such that the urea and the phosphoric acid each react with the pulp; and

preparing nanocellulose by washing the pulp which is completely reacted, and then grinding the pulp,

wherein a weight of the phosphoric acid is 10 to 50% based on a weight of the pulp.

2. The method of claim 1, wherein a weight of the urea is twice or more the weight of the phosphoric acid.

3. The method of claim 1, wherein the heating of the solution such that the urea and the phosphoric acid each react with the pulp is performed at a temperature of 100 to 250°

C.

4. The method of claim 1, wherein the nanocellulose has an average diameter of 50 nm or less.

5. The method of claim 4, wherein the nanocellulose has an average length of 2 μ

m or more.

6. The method of claim 1, wherein the nanocellulose has a thermal degradation temperature of 286 to 302°

C.

7. A fiber sheet consisting of the nanocellulose prepared by the method of claim 1.

8. A fiber sheet consisting of the nanocellulose prepared by the method of claim 2.

9. A fiber sheet consisting of the nanocellulose prepared by the method of claim 3.

10. A fiber sheet consisting of the nanocellulose prepared by the method of claim 4.

11. A fiber sheet consisting of the nanocellulose prepared by the method of claim 5.

12. A fiber sheet consisting of the nanocellulose prepared by the method of claim 6.