Preparation method and application of cellulose hybrid material with temperature-sensitive color change and ammonia gas response functions

Abstract

The application belongs to the technical field of nanomaterials, and relates to a preparation method of a cellulose hybrid material with temperature-sensitive discoloration and ammonia gas response functions and application thereof. The cellulose nanocrystal dispersion liquid is mixed with the ferric sulfate solution uniformly, the D-arginine solution is added, and the stirring reaction is carried out at room temperature. Then, the centrifugal separation, washing and freeze-drying are carried out, so that the cellulose hybrid material with the temperature-sensitive discoloration and ammonia gas response functions is obtained. The cellulose hybrid material prepared has excellent temperature-sensitive discoloration, ammonia gas response performance and ultraviolet absorption performance, and has the advantages of simple preparation process, environmental protection, low cost and suitability for large-scale production. The cellulose hybrid material has wide application prospects in the fields of food packaging, intelligent materials, temperature-sensitive discoloration materials, ammonia gas detection, environmental monitoring and safety, etc.

Description

Technical Field

[0001] The present invention belongs to the technical field of nanomaterials, and in particular relates to a preparation method of a cellulose hybrid material having both temperature-sensitive color change and ammonia response functions and an application thereof. Background Art

[0002] Cellulose nanocrystals (CNCs) possess exceptional properties, including high strength, high crystallinity, a large specific surface area, excellent stability, and biodegradability, making them promising for the production of a variety of high-value-added advanced functional materials. Materials with multiple functionalities (such as thermochromic, ammonia response, and UV absorption) have broad application prospects in areas such as food packaging, smart materials, thermochromic materials, ammonia detection, environmental monitoring, and safety, and have become a current research hotspot. Therefore, developing simple and economical methods to prepare cellulose hybrid materials with multiple functions (such as thermochromic, ammonia response, and UV absorption) holds great promise for future applications. Summary of the Invention

[0003] Against this backdrop, the present invention provides a method for preparing a cellulose hybrid material with both temperature-sensitive color change and ammonia-responsive properties, and its application. The resulting cellulose hybrid material exhibits excellent temperature-sensitive color change, ammonia-responsive color change, and UV absorption properties. The preparation process is simple, environmentally friendly, low-cost, and suitable for scale-up production.

[0004] Technical solution of the present invention:

[0005] A method for preparing a cellulose hybrid material having both temperature-sensitive color change and ammonia response functions comprises the following steps:

[0006] (1) Dispersing 30 parts by mass of cellulose nanocrystals uniformly in 1000 parts by mass of deionized water to obtain a cellulose dispersion for later use;

[0007] (2) dissolving 20 parts by mass of ferric sulfate in a mixed solvent of 2000 parts by mass of ethanol and 1000 parts by mass of deionized water to obtain a ferric sulfate solution for later use;

[0008] (3) adding the ferric sulfate solution of step (2) dropwise to the cellulose dispersion of step (1), stirring at room temperature for 60 minutes to obtain a mixed solution for later use;

[0009] (4) Weigh 8.71 parts by mass of D-arginine and add it to a mixed solvent of 2500 parts by mass of ethanol and 1000 parts by mass of deionized water. Stir at room temperature for 30 minutes to obtain a D-arginine solution for later use.

[0010] (5) The D-arginine solution of step (4) is added dropwise to the mixed solution of step (3), and the mixture is stirred at room temperature for 20 minutes, followed by centrifugation, washing, and freeze-drying to obtain a cellulose hybrid material having both temperature-sensitive color change and ammonia response functions.

[0011] The present invention has the beneficial effects:

[0012] The multifunctional cellulose hybrid particles prepared by the present invention have excellent temperature-sensitive color change, ammonia-responsive color change and ultraviolet absorption properties. The preparation process is simple, environmentally friendly, low-cost, and suitable for large-scale production. It has broad application prospects in food packaging, smart materials, temperature-sensitive color-changing materials, ammonia detection, environmental monitoring and safety fields. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 This is a scanning electron microscope image of the cellulose hybrid material prepared in an embodiment of the present invention;

[0014] Figure 2 The infrared spectra of unmodified cellulose and the cellulose hybrid material prepared in the embodiment of the present invention;

[0015] Figure 3 These are the ultraviolet absorption spectra of unmodified cellulose and the cellulose hybrid material prepared in the examples of the present invention. DETAILED DESCRIPTION

[0016] The present invention is described in detail below through examples. It is necessary to point out that the examples are only used to further illustrate the present invention and are not to be construed as limiting the scope of the present invention. Those skilled in the art may make some non-essential improvements and adjustments based on the above-mentioned contents of the present invention. Unless otherwise specified, the parts of the raw materials are all parts by mass.

[0017] In a specific embodiment, the cellulose nanocrystals (i.e., the unmodified cellulose in the present invention) used are products provided by Guilin Qihong Technology Co., Ltd., with a diameter of 4 to 10 nm and a length of 100 to 500 nm; D-arginine, ferric sulfate, and anhydrous ethanol are analytical grade reagents provided by Xilong Chemical Co., Ltd.

[0018] Example:

[0019] A method for preparing a cellulose hybrid material having both temperature-sensitive color change and ammonia response functions comprises the following steps:

[0020] (1) Dispersing 30 parts by mass of cellulose nanocrystals uniformly in 1000 parts by mass of deionized water to obtain a cellulose dispersion for later use;

[0021] (2) dissolving 20 parts by mass of ferric sulfate in a mixed solvent of 2000 parts by mass of ethanol and 1000 parts by mass of deionized water to obtain a ferric sulfate solution for later use;

[0022] (3) adding the ferric sulfate solution of step (2) dropwise to the cellulose dispersion of step (1), stirring at room temperature for 60 minutes to obtain a mixed solution for later use;

[0023] (4) Weigh 8.71 parts by mass of D-arginine and add it to a mixed solvent of 2500 parts by mass of ethanol and 1000 parts by mass of deionized water. Stir at room temperature for 30 minutes to obtain a D-arginine solution for later use.

[0024] (5) The D-arginine solution of step (4) is added dropwise to the mixed solution of step (3), and the mixture is stirred at room temperature for 20 minutes, followed by centrifugation, washing, and freeze-drying to obtain a cellulose hybrid material having both temperature-sensitive color change and ammonia response functions.

[0025] The modified cellulose, i.e. the cellulose hybrid material with both temperature-sensitive color change and ammonia response function prepared by the present invention, has a scanning electron microscope image as shown in FIG. Figure 1 ; Figure 2 This is the infrared spectrum of the cellulose hybrid material prepared in the present invention; the above results show that compared with unmodified cellulose, the cellulose hybrid material prepared in the present invention has a different structure.

[0026] Unmodified cellulose is white in color and does not change color after exposure to an ammonia environment. The modified cellulose, i.e., the cellulose hybrid material prepared in the present invention, is yellow in color and quickly changes color (within 1 minute) to brown after exposure to an ammonia environment, indicating that the cellulose hybrid material has excellent ammonia-responsive color-changing properties.

[0027] Unmodified cellulose is white in color and does not change significantly when placed in a high temperature environment of 90°C. The modified cellulose, i.e., the cellulose hybrid material prepared in the present invention, is yellow in color and rapidly changes to dark brown when placed in a high temperature environment of 90°C, indicating that the cellulose hybrid material has excellent temperature-sensitive color-changing properties.

[0028] The UV-visible performance of the products was evaluated using a UV-visible spectrometer (Lamdba365, PerkinElmer Instruments); Figure 3 The UV-visible spectra of unmodified cellulose and the aqueous dispersion of the cellulose hybrid material prepared by the present invention show that the cellulose hybrid material prepared by the present method has significantly improved UV absorption performance compared with unmodified cellulose.

[0029] In summary, the cellulose hybrid material prepared by the present invention has excellent temperature-sensitive color change, ammonia-responsive color change and ultraviolet absorption properties, and the preparation process is simple, environmentally friendly, low-cost, and suitable for large-scale production. It has broad application prospects in food packaging, smart materials, temperature-sensitive color-changing materials, ammonia detection, environmental monitoring and safety fields.

[0030] The content of the present invention is not limited to the embodiments listed. Any equivalent transformation of the technical solution of the present invention made by ordinary technicians in this field after reading the description of the present invention is covered by the claims of the present invention.

Claims

1. A method for preparing a cellulose hybrid material with both temperature-sensitive color change and ammonia response functions, characterized in that The steps include: (1) Dispersing 30 parts by mass of cellulose nanocrystals uniformly in 1000 parts by mass of deionized water to obtain a cellulose dispersion for later use; (2) dissolving 20 parts by mass of ferric sulfate in a mixed solvent of 2000 parts by mass of ethanol and 1000 parts by mass of deionized water to obtain a ferric sulfate solution for later use; (3) adding the ferric sulfate solution of step (2) dropwise to the cellulose dispersion of step (1), stirring at room temperature for 60 minutes to obtain a mixed solution for later use; (4) Weigh 8.71 parts by mass of D-arginine and add it to a mixed solvent of 2500 parts by mass of ethanol and 1000 parts by mass of deionized water. Stir at room temperature for 30 minutes to obtain a D-arginine solution for later use. (5) The D-arginine solution of step (4) is added dropwise to the mixed solution of step (3), and the mixture is stirred at room temperature for 20 minutes, followed by centrifugation, washing, and freeze-drying to obtain a cellulose hybrid material having both temperature-sensitive color change and ammonia response functions.

2. A cellulose hybrid material having both temperature-sensitive color change and ammonia response functions obtained by the preparation method according to claim 1.

3. The use of the cellulose hybrid material having both temperature-sensitive color change and ammonia response functions obtained by the preparation method according to claim 1, characterized in that: Used in food packaging, smart materials, temperature-sensitive color-changing materials, ammonia detection, environmental monitoring and safety fields.

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