US 12,305,011 B2 · Wavelength-controllable cellulose iridescent film and method for preparation thereof

Abstract

The present invention belongs to the technical field of functional film materials; disclosed are a wavelength-controllable cellulose iridescent film and a method for preparation thereof. The method is: (1) mixing well a cellulose nanocrystal (CNC) suspension with lactic acid solution and glucose solution to obtain a CNC/lactic acid/glucose mixed solution; said CNC suspension being a cellulose nanocrystal suspension; (2) drying the CNC/lactic acid/glucose mixed solution to form a film to obtain a cellulose iridescent film. The method of the present invention is simple and low in cost. In the present invention, by means of the addition of lactic acid and glucose, the prepared film has iridescent film characteristics; the wavelength of the iridescent film is within the range of visible light, and the wavelengths of different colors of iridescent film are controllable.

Claims8

Dependent claims

A preparation method for a wavelength-controllable cellulose iridescent film, characterized in that, it comprises the following steps:

(1) evenly mixing a CNC suspension with a lactic acid solution and a glucose solution, to obtain a CNC/lactic acid/glucose mixed solution, wherein the CNC suspension is a suspension of a cellulose nanocrystal;
and
(2) drying the CNC/lactic acid/glucose mixed solution to form a film, to obtain a cellulose iridescent film, wherein:
in step (1), a volume ratio of the CNC suspension to the lactic acid solution and the glucose solution is (12-8):
1:(2-3);
in step (1), a concentration of the cellulose nanocrystal in the CNC suspension is 3 wt %-4 wt %;
and
a concentration of the lactic acid solution is 8 wt %-10 wt %, and a concentration of the glucose solution is 10 wt %-20 wt %.

5 more elements

Dependencies are inferred from the claim text.

Facts

Application

18/113,114Filed 23 Feb 2023 · continuation

Priority

CN 202011180894.929 Oct 2020

Published

US 2023/0192975 A122 Jun 2023

Granted

20 May 2025

Term ends

Not estimatedThe source records don’t support an estimate.

Classification33 codes

C08J 5/18
Manufacture of articles or shaped materials containing macromolecular substances: manufacture of films or sheets
C08J 3/03
Making solutions, dispersions, lattices or gels by other methods than by solution, emulsion or suspension polymerisation techniques: in aqueous media
C08J 5/005
Manufacture of articles or shaped materials containing macromolecular substances: reinforced macromolecular compounds with nanosized materials,…
C08J 7/02
Chemical treatment or coating of shaped articles made of macromolecular substances: with solvents, e.g. swelling agents

Wavelength-controllable cellulose iridescent film and method for preparation thereof

Life of this patent

Wavelength-controllable cellulose iridescent film and method for preparation thereof

Life of this patent

Abstract

Claims8