A method for finishing a fluorescent whitening multifunctional cotton fabric

Abstract

The application discloses a finishing method of fluorescent whitening multifunctional cotton fabric, which comprises the following steps: soaking the fabric in a strong alkali aqueous solution for alkalization treatment to obtain pretreated cotton fabric; mixing a metal compound, a carbon source and water, and preparing a positively charged metal-doped carbon dot solution through one-step hydrothermal reaction; soaking the pretreated fabric in the positively charged metal-doped carbon dot solution for treatment, drying, and then soaking the fabric in the positively charged metal-doped carbon dot solution again for treatment; and soaking the fabric in the positively charged metal-doped carbon dot solution again for treatment after drying, so as to obtain stable and durable multifunctional fabric with antibacterial, anti-ultraviolet and fluorescent whitening functions. The metal-doped carbon dot has good biocompatibility and stability, is non-toxic and harmless, and is reacted in an aqueous phase without adding any organic solvent, so the method is environment-friendly. The finished cotton fabric has multifunctions such as antibacterial, anti-ultraviolet and fluorescent whitening, and has a good application prospect.

Description

Technical Field

[0001] This invention belongs to the field of fabric finishing technology, specifically relating to a finishing method for fluorescent whitening multifunctional cotton fabrics. Background Technology

[0002] With the industrialization of textiles and advancements in technology, the popularity of functional textiles has increased significantly, leading to a substantial increase in global demand for multifunctional textiles. Cotton fabrics, with their excellent moisture absorption and breathability, comfortable wear, soft hand feel, and gentle luster, are the preferred material for summer clothing.

[0003] However, because cotton fiber is a natural fiber, its chemical structure contains only hydroxyl groups and no functional groups that absorb in the near-ultraviolet region. This characteristic determines that cotton fiber is prone to mildew and has poor UV resistance. Therefore, antibacterial and UV-resistant properties are often the focus of research on functional modification for summer fabrics.

[0004] Traditional textile treatments often require the use of chemicals that can lead to adverse environmental consequences. These chemicals include toxic substances, heavy metals, or non-biodegradable compounds that can accumulate in ecosystems and pose potential risks to human health. In particular, cotton fabrics, as the preferred summer fabric, undergo most finishing processes such as whitening, softening, and stiffening to improve their quality. Summary of the Invention

[0005] The purpose of this section is to outline some aspects of embodiments of the present invention and to briefly describe some preferred embodiments. Simplifications or omissions may be made in this section, as well as in the abstract and title of this application, to avoid obscuring the purpose of these documents; however, such simplifications or omissions should not be construed as limiting the scope of the invention.

[0006] In view of the problems existing in the above and / or prior art, the present invention is proposed.

[0007] Therefore, the purpose of this invention is to overcome the shortcomings of the prior art and provide a finishing method for fluorescent whitening multifunctional cotton fabrics.

[0008] To solve the above-mentioned technical problems, the present invention provides the following technical solution: a finishing method for fluorescent whitening multifunctional cotton fabric, comprising,

[0009] The fabric is alkalized by immersing it in a strong alkaline aqueous solution to obtain pretreated cotton fabric.

[0010] A positively charged metal-doped carbon dot solution was prepared by mixing a metal compound, a carbon source, and water and reacting them in a one-step hydrothermal process.

[0011] The pretreated fabric was immersed in a positively charged metal-doped carbon dot solution, dried, and then immersed in a positively charged metal-doped carbon dot solution again.

[0012] After drying, the fabric is soaked again in a positively charged metal-doped carbon dot solution to obtain a stable and durable multifunctional fabric with antibacterial, UV-resistant, and fluorescent whitening properties.

[0013] In a preferred embodiment of the finishing method described in this invention, the strong alkali includes sodium hydroxide.

[0014] In a preferred embodiment of the finishing method described in this invention, the alkali treatment includes a strong alkaline aqueous solution with a concentration of 8–20 g / L, a bath ratio of the fabric to the strong alkaline aqueous solution of 1:5–1:20, an alkali treatment temperature of 60–80°C, and an alkali treatment time of 1–2 h.

[0015] In a preferred embodiment of the finishing method described in this invention, the metal compound includes zinc nitrate, and the carbon source includes tryptophan and glucose.

[0016] In a preferred embodiment of the finishing method described in this invention, the zinc nitrate comprises 0.2-0.8 wt% by mass, tryptophan comprises 0.2 wt% by mass, and glucose comprises 0.3 wt% by mass.

[0017] In a preferred embodiment of the finishing method described in this invention, the hydrothermal reaction is carried out at a temperature of 160–200°C for 3–4 hours.

[0018] In a preferred embodiment of the finishing method described in this invention, the bath ratio of the pretreated fabric to the metal-doped carbon dot solution is 1:5 to 1:20.

[0019] In a preferred embodiment of the finishing method described in this invention, the soaking temperature is 60-80℃ and the soaking time is 1-2 hours.

[0020] In a preferred embodiment of the finishing method described in this invention, the drying temperature is 60°C and the drying time is 1 hour.

[0021] Beneficial effects of this invention:

[0022] (1) The method and process of the present invention are simple and efficient; the raw materials are low in cost and easy to obtain, which is conducive to industrial production.

[0023] (2) The metal-doped carbon dots used in the reaction process of this invention have good biocompatibility and stability, are non-toxic and harmless, and the reaction is carried out in the aqueous phase without the need to add any organic solvents, which is environmentally friendly. After finishing, cotton fabrics have multiple functions such as antibacterial, anti-ultraviolet and fluorescent whitening, and have good application prospects. This finishing method is also applicable to other non-cotton fabrics. Attached Figure Description

[0024] To more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings used in the following description of the embodiments will be briefly introduced. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort. Wherein:

[0025] Figure 1 This is a scanning electron microscope image of the multifunctional cotton fabric prepared in Example 1 of the present invention;

[0026] Figure 2 The image shows the fluorescence effect of the multifunctional cotton fabric prepared in Example 1 of this invention under a 365nm ultraviolet lamp.

[0027] Figure 3 The image shows the antibacterial effect of the multifunctional cotton fabric prepared in Example 1 of this invention against S. aureus and E. coli.

[0028] Figure 4 The ultraviolet transmittance diagram of the multifunctional cotton fabric prepared in Example 1 of the present invention;

[0029] Figure 5 The image shows the UPF value of the multifunctional cotton fabric prepared in Example 1 of this invention. Detailed Implementation

[0030] To make the above-mentioned objects, features and advantages of the present invention more apparent and understandable, the specific embodiments of the present invention will be described in detail below with reference to the examples in the specification.

[0031] Many specific details are set forth in the following description in order to provide a full understanding of the invention. However, the invention may also be practiced in other ways different from those described herein, and those skilled in the art can make similar extensions without departing from the spirit of the invention. Therefore, the invention is not limited to the specific embodiments disclosed below.

[0032] Secondly, the term "one embodiment" or "embodiment" as used herein refers to a specific feature, structure, or characteristic that may be included in at least one implementation of the present invention. The phrase "in one embodiment" appearing in different places in this specification does not necessarily refer to the same embodiment, nor is it a single or selective embodiment that is mutually exclusive with other embodiments.

[0033] The raw materials used in the embodiments of this invention are all commercially available products.

[0034] Example 1

[0035] (1) The cotton fabric is alkalized. The concentration of the strong alkali water (sodium hydroxide) solution is 8g / L. The bath ratio of the cotton fabric to the strong alkali water solution is 1:20. The cotton fabric is soaked in the strong alkali water solution at 80℃ for 1h to obtain the pretreated cotton fabric.

[0036] (2) Preparation of metal-doped carbon dot solution: First weigh 0.5g of zinc nitrate, 0.2g of tryptophan and 0.3g of glucose and mix them. Dissolve them in 100ml of deionized water. Pour the mixed solution into a reaction vessel and heat it in a 160℃ drying oven for 4h. After the reaction is completed, cool it to room temperature and filter it through a 0.22um filter membrane to remove impurities, and obtain a positively charged metal-doped tryptophan carbon dot solution.

[0037] (3) The cotton fabric treated with alkali was soaked in a metal-doped tryptophan carbon dot solution at 80°C for 1 hour with a bath ratio of 1:20, and then dried in an oven at 60°C for 1 hour. The soaking and drying were repeated twice to load metal-doped tryptophan carbon dots on the surface of the cotton fabric through electrostatic interaction.

[0038] The microstructure of untreated and treated cotton fabrics was characterized using scanning electron microscopy (SEM). SEM images of the cotton fabrics are shown below. Figure 1 The treated cotton fabric has a relatively rough surface and the parallel grooves are not obvious;

[0039] Two types of cotton fabric samples were placed under a 365nm UV lamp using a three-in-one UV analyzer to observe their surface fluorescence. The comparison of the fluorescence effects of the cotton fabrics is shown in the figure below. Figure 2 Carbon dots were successfully loaded onto cotton fabric and exhibited good fluorescence properties, with a measured fluorescence intensity of 2199 au / m.

[0040] The antibacterial properties of cotton fabrics were evaluated using inhibition zone experiments with two common bacteria, S. aureus and E. coli. The antibacterial effects of cotton fabrics against S. aureus and E. coli are shown in the figures. Figure 3 Multifunctional cotton fabrics have good antibacterial properties, while untreated cotton fabrics do not have antibacterial effects;

[0041] The UV resistance of cotton fabrics was tested using ultraviolet light with a wavelength range of 250-450 nm and a corresponding UV receiving sensor. The light transmittance of the cotton fabrics is shown in the figure. Figure 4 See UPF value Figure 5 It can be seen that the multifunctional cotton fabric treated with carbon dots has a lower transmittance and a higher UPF value, and its UV resistance is better than that of untreated cotton fabric.

[0042] Example 2

[0043] (1) The cotton fabric is alkalized. The concentration of the strong alkali aqueous solution is 8 g / L. The ratio of the cotton fabric to the strong alkali aqueous solution is 1:20. The cotton fabric is soaked in the strong alkali aqueous solution at 80℃ for 1 h to obtain the pretreated cotton fabric.

[0044] (2) Preparation of metal-doped carbon dot solution: First, weigh 0.8g of zinc nitrate, 0.2g of tryptophan and 0.3g of glucose and mix them. Dissolve them in 100ml of deionized water. Pour the mixed solution into a reaction vessel and heat it in a 160℃ drying oven for 4h. After the reaction is completed, cool it to room temperature and filter it through a 0.22um filter membrane to remove impurities, thus obtaining a positively charged metal-doped tryptophan carbon dot solution.

[0045] (3) The alkali-treated cotton fabric was immersed in a metal-doped tryptophan carbon dot solution at 80°C for 1 hour (liquid ratio 1:20), and then dried in an oven at 60°C for 1 hour. This process of immersion and drying was repeated twice, thereby loading metal-doped tryptophan carbon dots onto the surface of the cotton fabric through electrostatic interaction. The fluorescence intensity was measured to be 2104 au / m.

[0046] Example 3

[0047] (1) The cotton fabric is alkalized. The concentration of the strong alkali aqueous solution is 8 g / L. The bath ratio of the cotton fabric to the strong alkali aqueous solution is 1:20. The cotton fabric is soaked in the strong alkali aqueous solution at 80℃ for 1 h to obtain the pretreated cotton fabric.

[0048] (2) Preparation of metal-doped carbon dot solution:

[0049] First, weigh out 0.2g of zinc nitrate, 0.2g of tryptophan and 0.3g of glucose and mix them. Dissolve them in 100ml of deionized water. Pour the mixed solution into a reaction vessel and heat it in a 160℃ drying oven for 4 hours. After the reaction is complete, cool it to room temperature and filter it through a 0.22um filter membrane to remove impurities, thus obtaining a positively charged metal-doped tryptophan carbon dot solution.

[0050] (3) The cotton fabric treated with alkali was soaked in a metal-doped tryptophan carbon dot solution at 80°C for 1 hour with a bath ratio of 1:20, and then dried in an oven at 60°C for 1 hour. The soaking and drying were repeated twice to load metal-doped tryptophan carbon dots on the surface of the cotton fabric through electrostatic interaction. The fluorescence intensity was measured to be 2048 au / m.

[0051] Comparative Example 1

[0052] (1) The cotton fabric is alkalized. The concentration of the strong alkali water (sodium hydroxide) solution is 8g / L. The bath ratio of the cotton fabric to the strong alkali water solution is 1:20. The cotton fabric is soaked in the strong alkali water solution at 80℃ for 1h to obtain the pretreated cotton fabric.

[0053] (2) Preparation of iron-doped carbon dot solution: First, weigh 0.5g of ferric nitrate, 0.2g of tryptophan and 0.3g of glucose and mix them. Dissolve them in 100ml of deionized water. Pour the mixed solution into a reaction vessel and heat it in a 160℃ drying oven for 4h. After the reaction is completed, cool it to room temperature and filter it through a 0.22um filter membrane to remove impurities, thus obtaining a positively charged metal-doped tryptophan carbon dot solution.

[0054] (3) The cotton fabric treated with alkali was soaked in an iron-doped tryptophan carbon dot solution at 80°C for 1 hour with a bath ratio of 1:20, and then dried in an oven at 60°C for 1 hour. The soaking and drying were repeated twice to load iron-doped tryptophan carbon dots on the surface of the cotton fabric through electrostatic interaction.

[0055] Its fluorescence effect was poor, with a measured fluorescence intensity of 1433 au / m.

[0056] Comparative Example 2

[0057] (1) The cotton fabric is alkalized. The concentration of the strong alkali aqueous solution is 8 g / L. The ratio of the cotton fabric to the strong alkali aqueous solution is 1:20. The cotton fabric is soaked in the strong alkali aqueous solution at 80℃ for 1 h to obtain the pretreated cotton fabric.

[0058] (2) Preparation of metal-free carbon dot solution:

[0059] First, weigh out 0.5g of tryptophan and 0.3g of glucose and mix them. Dissolve them in 100ml of deionized water. Pour the mixed solution into a reaction vessel and heat it in a 160℃ drying oven for 4 hours. After the reaction is complete, cool it to room temperature and filter it through a 0.22um filter membrane to remove impurities, thus obtaining a positively charged tryptophan carbon dot solution.

[0060] (3) The cotton fabric treated with alkali was soaked in a tryptophan carbon dot solution at 80°C for 1 hour with a bath ratio of 1:20, and then dried in an oven at 60°C for 1 hour. The soaking and drying were repeated twice to load tryptophan carbon dots on the surface of the cotton fabric through electrostatic interaction.

[0061] It exhibits good fluorescence, with a measured fluorescence intensity of 1960 au / m, but its antibacterial effect is relatively poor.

[0062] Comparative Example 3

[0063] (1) The cotton fabric is alkalized. The concentration of the strong alkali aqueous solution is 8 g / L. The bath ratio of the cotton fabric to the strong alkali aqueous solution is 1:20. The cotton fabric is soaked in the strong alkali aqueous solution at 80℃ for 1 h to obtain the pretreated cotton fabric.

[0064] (2) Preparation of tryptophan-free carbon dot solution:

[0065] First, weigh out 0.5g of zinc nitrate and 0.3g of glucose and mix them. Dissolve them in 100ml of deionized water. Pour the mixed solution into a reaction vessel and heat it in a 160℃ drying oven for 4 hours. After the reaction is complete, cool it to room temperature and filter it through a 0.22um filter membrane to remove impurities, thus obtaining a positively charged tryptophan carbon dot solution.

[0066] (3) Soak the alkali-treated cotton fabric in an 80°C tryptophan carbon dot solution for 1 hour at a bath ratio of 1:20, and then dry it in a 60°C oven for 1 hour. Repeat the soaking and drying process twice.

[0067] Its fluorescence effect was poor, with a measured fluorescence intensity of 1025 au / m.

[0068] The metal-doped carbon dots used in the reaction process of this invention have good biocompatibility and stability, are non-toxic and harmless, and the reaction is carried out in an aqueous phase without the need to add any organic solvents, making it environmentally friendly. After finishing, cotton fabrics have multiple functions such as antibacterial, anti-ultraviolet and fluorescent whitening, and have good application prospects. This finishing method is also applicable to other non-cotton fabrics.

[0069] It should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and are not intended to limit it. Although the present invention has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications or equivalent substitutions can be made to the technical solutions of the present invention without departing from the spirit and scope of the technical solutions of the present invention, and all such modifications or substitutions should be covered within the scope of the present invention.

Claims

1. A finishing method for fluorescent whitening multifunctional cotton fabric, characterized in that: include, The fabric is soaked in a strong alkaline aqueous solution for alkalization treatment to obtain pretreated cotton fabric. The alkalization treatment is carried out in the following manner: the concentration of the strong alkaline aqueous solution is 8~20 g / L, the bath ratio of the fabric to the strong alkaline aqueous solution is 1:5~1:20, the alkalization treatment temperature is 60~80℃, and the alkalization treatment time is 1~2h. The strong alkaline is sodium hydroxide. A positively charged metal-doped carbon dot solution is prepared by mixing a metal compound, a carbon source, and water via a one-step hydrothermal reaction. The metal compound is zinc nitrate, and the carbon source is tryptophan and glucose, wherein the mass percentages of zinc nitrate, tryptophan, and glucose are 0.2-0.8 wt%, 0.2 wt%, and 0.3 wt%. The pretreated cotton fabric was immersed in a positively charged metal-doped carbon dot solution, dried, and then immersed in a positively charged metal-doped carbon dot solution again. After drying, the fabric is soaked again in a positively charged metal-doped carbon dot solution to obtain a stable and durable multifunctional fabric with antibacterial, UV-resistant, and fluorescent whitening properties.

2. The sorting method as described in claim 1, characterized in that: The hydrothermal reaction is carried out at a temperature of 160-200℃ for 3-4 hours.

3. The sorting method as described in claim 1, characterized in that: The bath ratio of the pretreated cotton fabric to the metal-doped carbon dot solution is 1:5 to 1:

20.

4. The sorting method as described in claim 1, characterized in that: The soaking temperature is 60~80℃, and the soaking time is 1~2 hours.

5. The sorting method as described in claim 1, characterized in that: The drying temperature is 60℃ and the drying time is 1 hour.

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