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CN-121991253-A - Fluorescent cellulose nanocrystals based on fluorescent fabrics and process for making same

CN121991253ACN 121991253 ACN121991253 ACN 121991253ACN-121991253-A

Abstract

The invention belongs to the field of nanocellulose, and in particular relates to a fluorescent cellulose nanocrystal based on a fluorescent fabric and a manufacturing process thereof. The manufacturing process comprises the following steps of S1, cutting fluorescent fabric into fluorescent fabric pieces, S2, mixing acid with the fluorescent fabric, and S3, removing the acid after the reaction is finished to obtain the fluorescent cellulose nanocrystals. The invention can realize the effective recovery of the fluorescent dyeing textile waste under the conditions of completely retaining the covalent bonding fluorescent dye structure and avoiding the dissolution loss. The fluorescent components contained in the fluorescent fabric are effectively reserved in the CNC, so that the fiber recycling of the waste fluorescent fabric is realized, the pollution to the environment is reduced, the preparation cost of the fluorescent CNC raw material is reduced, and a feasible new way is provided for the high-added-value recycling of the waste fluorescent fabric.

Inventors

  • WEN YANGBING
  • Niu Yunuo
  • WANG CHUNPING

Assignees

  • 天津科技大学

Dates

Publication Date
20260508
Application Date
20260408

Claims (8)

  1. 1. A preparation process of fluorescent cellulose nanocrystals based on fluorescent fabrics is characterized by comprising the following steps of S1, cutting the fluorescent fabrics into fluorescent crushed cloth pieces, S2, mixing the fluorescent fabrics with acid, S3, removing organic fibers insoluble in the acid, S4, removing the acid after the reaction is finished to obtain fluorescent cellulose nanocrystals; The cotton content of the fluorescent fabric is 80%, and the spandex content is 20%; the reaction temperature in the step S2 is 45 ℃, the reaction time is 4 hours, the acid in the step S2 is sulfuric acid, and the concentration of the acid is 64 wt%.
  2. 2. The process for preparing fluorescent fabric-based fluorescent cellulose nanocrystals, as recited in claim 1, wherein the fluorescent fabric color comprises any one of or a mixture of fluorescent yellow, fluorescent red, or fluorescent green, and the crushed cloth pieces are 20 or less 5(mm)。
  3. 3. The process for preparing fluorescent-fabric-based fluorescent cellulose nanocrystals according to claim 1, wherein the solid-to-liquid ratio in step S2 is 1:1.5 to 1:10.
  4. 4. The preparation process of fluorescent fabric-based fluorescent cellulose nanocrystals is characterized in that an alkali liquor fixation reaction is further included between the step S2 and the step S3, wherein the alkali liquor fixation reaction comprises the specific steps of adding deionized water to dilute and terminate the reaction after the reaction in the step S2 is finished, standing the reaction system, removing supernatant, repeating the operation, neutralizing acid in the system with alkali, adjusting pH to pH=6, and fixing the pH of the system after the neutralization; The alkali is one or any combination of sodium hydroxide, sodium carbonate, ammonia water and magnesium oxide, the concentration of the alkali is 2 wt% -10 wt%, the fixation temperature is 30 ℃ -100 ℃, and the fixation time is 0.5-3 h.
  5. 5. The process for preparing fluorescent textile-based fluorescent cellulose nanocrystals according to claim 1, wherein the step S3 comprises the specific steps of passing the sample through a 300 mesh or more screen to remove organic fibers insoluble in the system.
  6. 6. The preparation process of fluorescent fabric-based fluorescent cellulose nanocrystals according to claim 1, wherein the specific step of step S4 is that the reaction system is transferred into a dialysis bag for dialysis, and then subjected to ultrasonic treatment to uniformly disperse the reaction system, so as to obtain a CNC suspension, and the CNC suspension is subjected to vacuum freeze-drying to obtain CNC powder.
  7. 7. The process for preparing fluorescent fabric-based fluorescent cellulose nanocrystals according to claim 6, wherein the mixture is transferred to a dialysis bag with a molecular weight of 10000 for dialysis until the pH reaches neutral, acid and small molecular impurities are removed, the dialysis treatment time is 48 to 96 hours, and the ultrasound time is 10 to 30 minutes.
  8. 8. A fluorescent cellulose nanocrystal obtained by the process of any one of claims 1-7.

Description

Fluorescent cellulose nanocrystals based on fluorescent fabrics and process for making same Technical Field The invention belongs to the field of nanocellulose, and in particular relates to a fluorescent cellulose nanocrystal based on a fluorescent fabric and a manufacturing process thereof. Background With the excessive growth of urban textile production and consumption, a large amount of waste textiles cannot be efficiently recovered, so that fiber resources are seriously wasted. At present, the main treatment mode of waste textiles is incineration and burial. The fluorescent dyed textile contains organic fluorescent dye which is difficult to biodegrade, the traditional treatment mode cannot effectively recycle fiber resources and also causes environmental pollution, and meanwhile, the fluorescent dye cannot be extracted and reused efficiently, so that the problem of resource waste is further aggravated. Disclosure of Invention The invention aims to overcome the defects in the prior art and provides a fluorescent cellulose nanocrystal based on a fluorescent fabric and a manufacturing process thereof. The invention adopts the following technical scheme to realize the aim: A preparation process of fluorescent cellulose nanocrystals based on fluorescent fabrics comprises the following steps of S1, cutting the fluorescent fabrics into fluorescent fabric fragments, wherein the fluorescent fabrics are fluorescent pure cotton fabrics, S2, mixing the fluorescent fabrics with acid for reaction, wherein the reaction temperature is 45 ℃, the reaction time is 4 hours, the acid is sulfuric acid, the concentration of the acid is 64 wt%, S3, removing organic fibers insoluble in the acid, and S4, removing the acid after the reaction is finished to obtain the fluorescent cellulose nanocrystals. The fluorescent fabric in the step S1 comprises one or any combination of fluorescent cotton fabric, fluorescent flax fabric, fluorescent polyester-cotton blended fabric, cotton and viscose fiber blended fabric; The fluorescent color of the fluorescent fabric in the step S1 includes any one or a mixture of fluorescent yellow, fluorescent red or fluorescent green. The broken cloth piece is less than or equal to 205(mm)。 In the step S2, the solid-liquid ratio is 1:1.5-1:10. And the step S2 and the step S3 also comprise alkali liquor fixation reaction, wherein the specific step of alkali liquor fixation reaction is that deionized water is added to dilute and terminate the reaction after the reaction in the step S2 is finished, the reaction system is kept still, the supernatant is removed, the operation is repeated, acid in the system is neutralized by alkali, the pH value is adjusted to be pH=6, and the system is fixed after the neutralization. The alkali is one or any combination of sodium hydroxide, sodium carbonate, ammonia water and magnesium oxide, and the concentration of the alkali is 2 wt-10 wt%, preferably 5wt%. The fixation temperature is 30-100 ℃, and the fixation time is 0.5-3 hours. Preferably at 60 ℃ for 1h. The specific steps of the step S3 are that the sample is screened by a screen mesh with more than 300 meshes to remove the organic fiber insoluble in the system; And S4, transferring the reaction system to a dialysis bag after the fixation treatment is finished, continuing dialysis for acid removal, performing ultrasonic treatment to uniformly disperse the reaction system to obtain CNC suspension, and performing vacuum freeze drying to obtain CNC powder. And transferring the mixture into a dialysis bag with the molecular weight of 10000 for dialysis until the pH value reaches neutrality, removing acid and micromolecular impurities, wherein the dialysis treatment time is 48-96 h, and the ultrasonic time is 10-30 min. . The invention also comprises the fluorescent cellulose nanocrystals obtained by the preparation process. The invention also includes the application of the fluorescent cellulose nanocrystals. Compared with the prior art, the invention has the beneficial effects that: 1. The method can realize the effective recovery of the fluorescent dyeing textile waste on the premise of keeping the covalent bonding state of the fluorescent dye and the fiber and effectively avoiding the dissolution loss of the fluorescent dye. 2. The fluorescent components contained in the fluorescent fabric are effectively reserved in the CNC, so that the fiber recycling of the waste fluorescent fabric is realized, the pollution to the environment is reduced, the preparation cost of the fluorescent CNC raw material is reduced, and a feasible new way is provided for the high-added-value recycling of the waste fluorescent fabric. Drawings FIG. 1 is a graph showing a comparative example of dispersion stability of a fluorescent cotton textile treated with sulfuric acid at 64 wt% at different solid-to-liquid ratios (1:1.5, 1:3, 1:6, 1:10) after acidolysis, dialysis and delamination by standing, the resulting product was diluted to 1:1 wt%;