Modern process method for treating silk based on nanotechnology

Abstract

The invention discloses a modern process method for treating silk based on a nanotechnology. The modern process method comprises the steps of degreasing pretreatment, nano pretreatment, dyeing, fixation, secondary nano treatment, soft finishing, antibacterial post-treatment and the like. Silk impurities are removed through degreasing pretreatment, and a foundation is laid for follow-up treatment; the performance of the silk is improved by utilizing nano silicon dioxide and nano titanium dioxide in the nano pretreatment; the color is firm and bright through dyeing and fixation; the brightness and the wear resistance are enhanced by means of nano aluminum oxide and the like in the secondary nano treatment; soft finishing endows the silk with soft hand feeling; due to antibacterial post-treatment, the fabric has an antibacterial function. According to the technology, all the steps are synergistic, various properties such as color fastness, vividness, brightness, wear resistance and durability of the silk are remarkably improved, the silk is endowed with the anti-ultraviolet and self-cooling functions, and the silk is gorgeous and noble in texture.

Description

Technical Field

[0001] The present invention relates to the technical field of silk processing, and specifically refers to a modern process method for treating silk based on nanotechnology. Background Art

[0002] Silk, as a natural fiber fabric with a long history and high popularity, is world-famous for its soft handfeel, gorgeous appearance, and good wearing comfort. However, with the development of the times and the continuous improvement of consumer demands, traditional silk has gradually shown limitations in some performances.

[0003] In terms of color fastness, traditional silk is prone to color bleeding during daily wearing and washing. This not only affects the aesthetics of silk products, reduces their service life, but also may cause staining of other clothes, bringing troubles to consumers. For example, after multiple washes, the color of silk clothes will significantly fade, and the patterns will no longer be clear and vivid. This is mainly because the traditional dyeing process fails to fully combine the dye with silk fibers, and the dye is prone to falling off under the action of external factors (such as friction, water, etc.).

[0004] Regarding the brightness and reflective effect, although traditional silk has a certain luster, it is difficult to meet the pursuit of unique visual effects in the modern fashion industry. In some high-end fashion occasions, silk is required to have a more brilliant and unique luster to highlight its unique charm and quality. However, ordinary silk performs relatively mediocre in this regard and cannot meet the needs of designers for innovative designs.

[0005] The wear resistance and durability of silk also need to be improved. Since silk fibers are relatively delicate in themselves, during daily wearing, especially in parts where friction is relatively frequent, such as cuffs and collars, they are prone to wear and fuzzing, shortening the service life of silk products and restricting their application in some clothing categories with higher durability requirements.

[0006] In addition, with the continuous increase in people's attention to a healthy and comfortable life, the functional requirements for silk such as antibacterial, anti-ultraviolet, and self-cooling are also growing day by day. Traditional silk is relatively insufficient in these performances and cannot provide consumers with all-round protection and comfortable experience. For example, in hot summer, silk clothes cannot effectively help the human body dissipate heat and cool down, and are prone to breeding bacteria and generating odors in a humid environment. Summary of the Invention

[0007] The present invention aims to solve the above technical problems and provides a modern process method for treating silk based on nanotechnology, aiming to improve various performances of silk through a series of specific treatment steps and meet the diverse quality requirements of silk in the modern market.

[0008] To solve the above technical problems, the technical solution provided by the present invention is a modern process method for treating silk based on nanotechnology, including the following steps:

[0009] S1: Degreasing pretreatment

[0010] Place the silk in a sodium carbonate solution containing 0.5%-1.5% (mass fraction), treat it at a temperature of 60-80°C for 30-60 minutes, and then rinse it with clear water until it is neutral;

[0011] S2: Nano pretreatment

[0012] Before dyeing the silk, prepare a mixed solution by mixing nano-silica and nano-titanium dioxide according to a mass ratio of 1:(0.5-1.5). At a ratio of the mixed solution to the silk mass of (3-5):1, under the conditions of a temperature of 40-60°C and an ultrasonic power of 200-300W, perform nano-treatment on the silk for 20-40 minutes;

[0013] S3: Dyeing

[0014] Dye the silk pretreated with nano-technology according to the conventional dyeing process;

[0015] S4: Color fixation

[0016] Immerse the dyed silk in a cationic color fixing agent solution containing 2%-5% (mass fraction), treat it at a temperature of 50-70°C for 20-40 minutes, then perform water washing, and dry it at a temperature of 80-100°C for 30-60 minutes;

[0017] S5: Secondary nano-treatment

[0018] After the silk is dyed, prepare a treatment solution by mixing nano-aluminum oxide, silane coupling agent, and white tannic acid according to a mass ratio of (2-3):(1-2):(1-1.5). At a ratio of the treatment solution to the silk mass of (4-6):1, under the conditions of a temperature of 50-70°C, perform secondary nano-technology treatment on the silk in a ceramic reaction vessel for 30-50 minutes;

[0019] S6: Softening finish

[0020] Immerse the silk in a solution containing 1%-3% (mass fraction) of silicone softener, with a bath ratio of 1:(20-30), treat it at a temperature of 40-60°C and a stirring speed of 100-200 revolutions per minute for 20-30 minutes, then use centrifugal dehydration to dehydrate it at a speed of 3000-4000 revolutions per minute for 10-15 minutes, and finally dry it;

[0021] S7: Antibacterial post-treatment

[0022] Put the silk into a solution containing 0.05%-0.15% (mass fraction) of nano-silver antibacterial agent, with a bath ratio of 1:(15-25), treat it at a temperature of 30-50°C for 15-30 minutes, and then wash and dry it.

[0023] Further, in the S2 nano pretreatment step, the particle size range of nano-silica is 20-50 nanometers, and the particle size range of nano-titanium dioxide is 30-60 nanometers;

[0024] Adjust the pH value of the mixed solution to 6-8.

[0025] Further, in the S5 secondary nano treatment step, the particle size range of nano-aluminum oxide is 15-40 nanometers.

[0026] Further, in the S3 dyeing step, reactive dyes, acid dyes or direct dyes are selected for dyeing, the pH value of the dye solution is adjusted to 4-7, the dyeing temperature is 80-100°C, and the dyeing time is 60-90 minutes.

[0027] Further, in the S1 degreasing pretreatment, the stirring speed is 100-200 revolutions per minute, and the moisture content of the silk rinsed with clear water is 30%-40%.

[0028] Further, in the S7 antibacterial post-treatment step, the antibacterial effect is detected by the inhibition zone method, and the inhibition zone diameter against Escherichia coli and Staphylococcus aureus should be not less than 15 mm.

[0029] The advantages of the present invention compared with the prior art are as follows:

[0030] 1. Improve color fastness and vividness: Through nano pretreatment and color fixation steps, the nano materials are tightly combined with silk fibers, and the color fixing agent further stabilizes the dyes, significantly improving the color fastness of silk, basically solving the problem of silk fading, and at the same time making the silk color more vivid and lasting, greatly improving the aesthetics and service life of silk products.

[0031] 2. Enhance brightness and reflective effect: The application of materials such as nano-aluminum oxide in the secondary nano treatment endows silk with unique optical properties, greatly enhancing its brightness and reflective effect, meeting the requirements of the modern fashion industry for the unique visual effects of silk, and enhancing the competitiveness of silk products in the high-end market.

[0032] 3. Improve wear resistance and durability: During the nano pretreatment and secondary nano treatment processes, the nano materials fill and strengthen the silk fiber structure. At the same time, the high hardness characteristics of nano-aluminum oxide itself significantly enhance the wear resistance of silk, reducing problems such as abrasion and fuzzing, and expanding the application range of silk in different clothing categories.

[0033] 4. Endow with multiple functions: The application of nano-titanium dioxide endows silk with anti-ultraviolet performance, and nano-silver antibacterial agent makes silk have antibacterial function. In addition, due to the special properties of nano-materials and the change of silk fiber structure after treatment, it has a certain self-cooling function, providing consumers with a more comfortable and healthy wearing experience.

[0034] 5. Enhance the magnificent and noble degree: The comprehensively improved performance such as color fastness, vividness, brightness, glossiness, etc. makes silk present a more magnificent and noble texture as a whole, meets consumers' pursuit of high-quality silk products, and increases the added value of silk products.

[0035] 6. Realize industrial production: This process method has left the laboratory stage and realized industrial production, with good stability and repeatability, can meet the needs of large-scale production, and brings significant economic benefits to enterprises. Specific implementation mode

[0036] In order to make the technical problems, technical solutions and beneficial effects to be solved by the present invention more clear and understandable, the present invention will be further described in detail below in conjunction with embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not used to limit the present invention.

[0037] I. Working principle of the present invention:

[0038] The present invention is a modern process method for treating silk based on nanotechnology, which specifically includes the following steps:

[0039] S1: Degreasing pretreatment: Place the silk in a sodium carbonate solution containing 0.5%-1.5% (mass fraction), at a temperature of 60-80 °C, and treat it at a stirring speed of 100-200 revolutions per minute for 30-60 minutes, and then rinse it with clear water until the moisture content of the silk is 30%-40%.

[0040] Silk surfaces usually contain impurities such as natural waxes and oils, which will affect the combination of chemical reagents and silk fibers in subsequent treatment steps. Sodium carbonate solution is alkaline and can effectively saponify and dissolve the oils and other impurities on the silk surface at a certain temperature and stirring speed. Controlling the treatment time and temperature can ensure the degreasing effect while avoiding excessive damage to silk fibers. Rinsing to a specific moisture content creates suitable conditions for subsequent nano-pretreatment, enabling nano-materials to better contact silk fibers.

[0041] S2: Nano pretreatment: Before silk dyeing, prepare a mixed solution by mixing nano-silica with a particle size range of 20 - 50 nm and nano-titanium dioxide with a particle size range of 30 - 60 nm at a mass ratio of 1:(0.5 - 1.5). Adjust the pH value of the mixed solution to 6 - 8. Then, perform nano-treatment on the silk for 20 - 40 minutes at a temperature of 40 - 60 °C and an ultrasonic power of 200 - 300 W with a mass ratio of the mixed solution to silk of (3 - 5):1.

[0042] Nano-silica and nano-titanium dioxide have characteristics such as small size effect and surface and interface effect. Nano-silica can fill the gaps between silk fibers and enhance the binding force between fibers; nano-titanium dioxide has good photocatalytic activity and ultraviolet absorption ability. When the two are mixed in a specific ratio, under suitable pH value, temperature and ultrasonic conditions, they can adhere more uniformly to the surface of silk fibers and may combine with the fibers through chemical bonds or physical adsorption. The role of ultrasonic is to accelerate the dispersion and movement of nano-particles, promoting them to better penetrate into the interior of silk fibers, thereby improving the color fastness of silk and endowing it with properties such as anti-ultraviolet.

[0043] S3: Dyeing: Use reactive dyes, acid dyes or direct dyes, etc. to dye the silk that has undergone nano pretreatment. Adjust the pH value of the dyeing solution to 4 - 7 and dye for 60 - 90 minutes at a dyeing temperature of 80 - 100 °C.

[0044] Select different types of dyes according to the chemical properties of silk fibers and the target color. Adjusting the pH value, temperature and time of the dyeing solution is to create a suitable dyeing environment so that dye molecules can fully react chemically or physically adsorb with silk fibers to achieve a uniform and firm dyeing effect.

[0045] S4: Fixing: Immerse the dyed silk in a cationic fixing agent solution containing 2% - 5% (mass fraction), treat it at a temperature of 50 - 70 °C for 20 - 40 minutes, then wash it, and dry it at a temperature of 80 - 100 °C for 30 - 60 minutes.

[0046] The cationic fixing agent carries a positive charge and can combine with the negatively charged dye anions to form a protective film on the surface of silk fibers, preventing the dye molecules from falling off under the action of external factors, thereby improving the color fastness of silk. Control the fixing temperature and time to ensure that the fixing agent reacts fully with the dye while avoiding adverse effects on silk fibers.

[0047] S5: Secondary nano-treatment: After the silk is dyed, a treatment solution is prepared by mixing nano-aluminum oxide with a particle size range of 15 - 40 nm, a silane coupling agent, and white tannic acid in a mass ratio of (2 - 3):(1 - 2):(1 - 1.5). The silk is subjected to secondary nano-technology treatment in a ceramic reaction vessel for 30 - 50 minutes at a temperature of 50 - 70 °C with a ratio of the treatment solution to the silk mass of (4 - 6):1.

[0048] Nano-aluminum oxide has high hardness, high wear resistance, and good optical properties. The silane coupling agent can form chemical bonds between nano-aluminum oxide and silk fibers, enhancing the binding force between the two. White tannic acid can assist nano-aluminum oxide to disperse and adhere better. Conducting the treatment in a ceramic reaction vessel can avoid impurity contamination that may be brought by metal containers. Through secondary nano-treatment, the brightness, reflective effect, and wear resistance of the silk are further improved.

[0049] S6: Softening finishing: The silk is soaked in a solution containing 1% - 3% (mass fraction) of organosilicon softener with a bath ratio of 1:(20 - 30), and treated for 20 - 30 minutes at a temperature of 40 - 60 °C and a stirring speed of 100 - 200 revolutions per minute. Then, it is dehydrated by centrifugation at a speed of 3000 - 4000 revolutions per minute for 10 - 15 minutes, and finally dried.

[0050] The silicon-oxygen bond in the molecular structure of the organosilicon softener has good flexibility and can form a continuous film on the surface of silk fibers, reducing the friction between fibers and giving the silk a soft handfeel. Controlling the softener concentration, bath ratio, temperature, stirring speed, and treatment time ensures that the softener adheres evenly to the surface of silk fibers. The centrifugal dehydration method can effectively remove excess water, and the specific speed and time can avoid damaging the silk fibers.

[0051] S7: Antibacterial post-treatment: The silk is placed in a solution containing 0.05% - 0.15% (mass fraction) of nano-silver antibacterial agent with a bath ratio of 1:(15 - 25), and treated at a temperature of 30 - 50 °C for 15 - 30 minutes. Then, it is washed with water and dried, and the antibacterial effect is detected by the inhibition zone method. The inhibition zone diameter against Escherichia coli and Staphylococcus aureus should be not less than 15 mm.

[0052] The nano-silver antibacterial agent has broad-spectrum antibacterial properties. Silver ions can bind to biological macromolecules such as proteins and nucleic acids of bacteria, disrupting the physiological activities of bacteria, thereby achieving the antibacterial effect. Controlling the antibacterial agent concentration, bath ratio, temperature, and treatment time ensures effective antibacterial while avoiding adverse effects on silk fibers and human health. Detecting the antibacterial effect by the inhibition zone method can visually evaluate the inhibitory ability of silk against common bacteria.

[0053] II. Examples and Comparative Examples:

[0054] Example 1

[0055] Degreasing pretreatment: Place 120 g of silk in a 0.6% sodium carbonate solution (1200 mL), stir at 62 °C and 130 rpm for 55 minutes, rinse with water until the pH is 7, and the moisture content is 33%.

[0056] Nano pretreatment: Take 25 g of nano-silica (22 nm) and 35 g of nano-titanium dioxide (32 nm) to prepare a mixed solution (600 mL), and adjust the pH to 6.2. Treat the silk under ultrasonic waves at 42 °C and 210 W for 38 minutes.

[0057] Dyeing: Select reactive dyes, prepare a dye solution with a concentration of 2.8%, and adjust the pH to 5.5. Dye the silk at 88 °C for 85 minutes.

[0058] Fixing: Use a 2.2% cationic fixing agent solution (900 mL), treat the dyed silk at 52 °C for 38 minutes, wash with water, and then dry at 82 °C for 55 minutes.

[0059] Secondary nano treatment: Weigh 45 g of nano-aluminum oxide (18 nm), 22 g of silane coupling agent, and 28 g of white tannic acid to prepare a treatment solution (750 mL), and treat the silk in a ceramic container at 52 °C for 48 minutes.

[0060] Softening finish: Prepare a 1.2% silicone softener solution (bath ratio 1:21, 1260 mL), stir at 42 °C and 110 rpm for 21 minutes, centrifuge at 3100 rpm for 11 minutes, and then dry.

[0061] Antibacterial post-treatment: Use a 0.06% nano-silver antibacterial agent solution (bath ratio 1:16, 960 mL), treat the silk at 32 °C for 28 minutes, wash with water and dry. Test by the inhibition zone method, and the inhibition zone diameters for Escherichia coli and Staphylococcus aureus are 16 mm and 15.2 mm respectively.

[0062] Example 2

[0063] Degreasing pretreatment: Put 90 g of silk into a 1.4% sodium carbonate solution (900 mL), stir at 78 °C and 190 rpm for 32 minutes, rinse with water until the pH is 7, and the moisture content is 36%.

[0064] Nano pretreatment: Mix 18 g of nano-silica (45 nm) and 28 g of nano-titanium dioxide (55 nm) to form a 450 mL mixed solution, and adjust the pH to 7.8. Treat the silk under ultrasonic waves at 58 °C and 290 W for 22 minutes.

[0065] Dyeing: Use acid dyes, prepare a dye solution with a concentration of 3.2%, and adjust the pH to 4.8. Dye at 92 °C for 70 minutes.

[0066] Fixation: Treat with a 3.5% cationic fixing agent solution (800 mL) at 62 °C for 32 minutes, wash with water, and then dry at 92 °C for 42 minutes.

[0067] Secondary nano-treatment: Weigh 38 g of nano-aluminum oxide (35 nm), 19 g of silane coupling agent, and 24 g of white tannic acid to prepare 600 mL of treatment solution, and treat silk in a ceramic container at 62 °C for 38 minutes.

[0068] Softening finish: Prepare a 2.2% silicone softening agent solution (bath ratio 1:26, 1300 mL), stir at 52 °C and 160 rpm for 26 minutes, centrifuge at 3600 rpm for 13 minutes, and then dry.

[0069] Antibacterial post-treatment: Treat with a 0.14% nano-silver antibacterial agent solution (bath ratio 1:24, 1080 mL) at 48 °C for 16 minutes, wash with water and dry. Test by the inhibition zone method, and the inhibition zone diameters for Escherichia coli and Staphylococcus aureus are 20 mm and 18 mm respectively.

[0070] Example 3

[0071] Degreasing pretreatment: Place 110 g of silk in a 1.1% sodium carbonate solution (1100 mL), stir at 68 °C and 140 rpm for 40 minutes, rinse with water until the pH is 7, and the moisture content is 34%.

[0072] Nano-pretreatment: Take 22 g of nano-silica (35 nm) and 32 g of nano-titanium dioxide (45 nm) to prepare a mixed solution (550 mL), adjust the pH to 7.2. Treat silk under ultrasonic treatment at 48 °C and 230 W for 32 minutes.

[0073] Dyeing: Select a direct dye, prepare a 3% concentration dye solution, and adjust the pH to 5.2. Dye at 90 °C for 75 minutes.

[0074] Fixation: Treat with a 2.8% cationic fixing agent solution (1000 mL) at 58 °C for 35 minutes, wash with water, and then dry at 88 °C for 48 minutes.

[0075] Secondary nano-treatment: Weigh 42 g of nano-aluminum oxide (22 nm), 20 g of silane coupling agent, and 26 g of white tannic acid to prepare a treatment solution (700 mL), and treat silk in a ceramic container at 58 °C for 42 minutes.

[0076] Softening finish: Prepare a 1.8% silicone softening agent solution (bath ratio 1:23, 1265 mL), stir at 48 °C and 130 rpm for 23 minutes, centrifuge at 3300 rpm for 12 minutes, and then dry.

[0077] Antibacterial post-treatment: Treat with a 0.1% nano-silver antibacterial agent solution (bath ratio 1:20, 1100 mL) at 40 °C for 20 minutes, then wash with water and dry. Test by the inhibition zone method, the inhibition zone diameters against Escherichia coli and Staphylococcus aureus are 17 mm and 16 mm respectively.

[0078] Comparative Example 1 (lacking the nano-pre-treatment step)

[0079] Degreasing pre-treatment: Place 100 g of silk in a 1000 mL solution containing 1% sodium carbonate, stir at 70 °C and 150 revolutions per minute for 45 minutes, rinse with clear water until the pH is 7, and the moisture content is 35%.

[0080] Dyeing and fixing: Acid dyes, the pH of the dyeing solution is 5, the concentration is 3%, dye at 90 °C for 75 minutes; 3% cationic fixing agent, fix at 60 °C for 30 minutes, dry at 90 °C for 45 minutes.

[0081] Secondary nano-treatment: Prepare 600 mL of treatment solution with nano-aluminum oxide etc., treat in a ceramic container at 60 °C for 40 minutes.

[0082] Post-treatment: Calender 4 times with a 4 MPa calender (chromium-plated steel roller, Ra 0.2 μm); treat with 2% silicone softener and then dry; treat with 0.1% nano-silver antibacterial agent, the inhibition zone against Escherichia coli is 12 mm, and the inhibition zone against Staphylococcus aureus is 11 mm.

[0083] Comparative Example 2 (lacking the secondary nano-treatment step)

[0084] Degreasing pre-treatment: Place 100 g of silk in a 1000 mL solution containing 1% sodium carbonate, stir at 70 °C and 150 revolutions per minute for 45 minutes, rinse with clear water until the pH is 7, and the moisture content is 35%.

[0085] Nano-pre-treatment: Mix 20 g of 30-nm nano-silica and 30 g of 40-nm nano-titanium dioxide to prepare 500 mL of mixed solution, adjust the pH to 7, and perform ultrasonic treatment at 50 °C and 250 W for 30 minutes.

[0086] Dyeing and fixing: Acid dyes, the pH of the dyeing solution is 5, the concentration is 3%, dye at 90 °C for 75 minutes; 3% cationic fixing agent, fix at 60 °C for 30 minutes, dry at 90 °C for 45 minutes.

[0087] Post-treatment: Calender 4 times with a 4 MPa calender (chromium-plated steel roller, Ra 0.2 μm); treat with 2% silicone softener and then dry; treat with 0.1% nano-silver antibacterial agent, the inhibition zone against Escherichia coli is 13 mm, and the inhibition zone against Staphylococcus aureus is 12 mm.

[0088] Conclusion: In terms of color fastness and vividness, in Examples 1-3, after undergoing the standard wash color fastness test, after 50 cycles of washing, the color vividness remained at 85%-95%, and the color was still bright after multiple rubs during actual wearing. In Comparative Example 1, the nano pretreatment was missing, and in Comparative Example 2, the secondary nano treatment was missing. Their color vividness was only 40%-50% and 55%-65% respectively, and they were prone to color fading. This is due to the fact that the nano pretreatment and the secondary nano treatment enhanced the binding force between the fiber and the dye, making the dye adhere more firmly.

[0089] In terms of brightness and reflective effect, the average silk glossiness of Examples 1-3 exceeded 80 GU, with bright and unique reflections at different angles, being dazzling under the light. In contrast, the average glossiness of Comparative Example 1 and Comparative Example 2 was only about 50 GU and 60 GU respectively, with dull gloss and unobvious reflection. In the secondary nano treatment, nano-aluminum oxide and others synergistically changed the microscopic structure of the silk surface, optimizing the light reflection and scattering.

[0090] In the abrasion resistance and durability test, the silk in Examples 1-3 was rubbed 10,000 times by a Martindale abrasion tester, with only slight fuzzing and no damage. In actual use, parts such as the cuffs and collars could also maintain good integrity. In Comparative Example 1, obvious fuzzing and local damage occurred after 5,000 rubs, and in Comparative Example 2, after 7,000 rubs. The nano pretreatment and the secondary nano treatment filled the space between the fibers with nano materials, enhancing the binding force, and the wear-resistant layer formed by nano-aluminum oxide improved the abrasion resistance of the silk.

[0091] In terms of antibacterial, anti-ultraviolet and self-cooling functions, in Examples 1-3, the inhibition zone diameter against Escherichia coli and Staphylococcus aureus exceeded 15 mm, the ultraviolet protection factor reached 50+, and the surface temperature was 2-3 °C lower than the ambient temperature. In Comparative Example 1 and Comparative Example 2, the inhibition zones were small, the UPF values were about 30 and 40 respectively, and the temperature reduction range was only 0.5-1 °C. Nano-titanium dioxide imparted anti-ultraviolet performance, nano-silver antibacterial agent achieved antibacterial, and the change of nano materials and fiber structure affected heat transfer, bringing about the self-cooling effect.

[0092] The above describes the present invention and its implementation manners. Such a description is not restrictive. If those of ordinary skill in the art are inspired by it and, without departing from the purpose of the present invention, design similar structural manners and embodiments to this technical solution without creative efforts, they shall fall within the protection scope of the present invention.

Claims

1. A modern process method for treating silk based on nanotechnology, characterized in that: It includes the following steps: S1: Degreasing pretreatment Place the silk in a sodium carbonate solution containing 0.5%-1.5% (mass fraction), treat it at a temperature of 60-80°C for 30-60 minutes, and then rinse it with clean water until neutral; S2: Nano pretreatment Before silk dyeing, prepare a mixed solution by mixing nano-silica and nano-titanium dioxide according to a mass ratio of 1:(0.5-1.5). Treat the silk with the mixed solution at a mass ratio of (3-5):1 to the silk mass, at a temperature of 40-60°C and an ultrasonic power of 200-300W for 20-40 minutes; S3: Dyeing Dye the silk pretreated with nano technology according to the conventional dyeing process; S4: Color fixation Immerse the dyed silk in a cationic color fixing agent solution containing 2%-5% (mass fraction), treat it at a temperature of 50-70°C for 20-40 minutes, then wash it with water and dry it at a temperature of 80-100°C for 30-60 minutes; S5: Secondary nano treatment After the silk dyeing is completed, prepare a treatment solution by mixing nano-aluminum oxide, silane coupling agent and white tannic acid according to a mass ratio of (2-3):(1-2):(1-1.5). Treat the silk with the treatment solution at a mass ratio of (4-6):1 to the silk mass, at a temperature of 50-70°C, and perform secondary nano technology treatment on the silk in a ceramic reaction vessel for 30-50 minutes; S6: Soft finishing Immerse the silk in a solution containing 1%-3% (mass fraction) of silicone softener, with a bath ratio of 1:(20-30), treat it at a temperature of 40-60°C and a stirring speed of 100-200 revolutions per minute for 20-30 minutes, then use centrifugal dehydration, dehydrate it at a rotation speed of 3000-4000 revolutions per minute for 10-15 minutes, and finally dry it; S7: Antibacterial post-treatment Put the silk into a solution containing 0.05%-0.15% (mass fraction) of nano-silver antibacterial agent, with a bath ratio of 1:(15-25), treat it at a temperature of 30-50°C for 15-30 minutes, then wash it with water and dry it.

2. The modern process method for treating silk based on nanotechnology according to claim 1, characterized in that: In the S2 nano pretreatment step, the particle size range of nano-silica is 20-50 nanometers, and the particle size range of nano-titanium dioxide is 30-60 nanometers; Adjust the pH value of the mixed solution to 6-8.

3. The modern process method for treating silk based on nanotechnology according to claim 1, characterized in that: In the S5 secondary nano treatment step, the particle size range of nano-aluminum oxide is 15-40 nanometers.

4. The modern process method for treating silk based on nanotechnology according to claim 1, characterized in that: In the S3 dyeing step, reactive dyes, acid dyes or direct dyes are selected for dyeing, the pH value of the dye solution is adjusted to 4-7, the dyeing temperature is 80-100°C, and the dyeing time is 60-90 minutes.

5. The modern process method for treating silk based on nanotechnology according to claim 1, characterized in that: In the S1 degreasing pretreatment, the stirring speed is 100-200 revolutions per minute, and the moisture content of the silk rinsed with clean water is 30%-40%.

6. The modern process method for treating silk based on nanotechnology according to claim 1, characterized in that: In the S7 antibacterial post-treatment step, the antibacterial effect is detected by the inhibition zone method, and the inhibition zone diameter against Escherichia coli and Staphylococcus aureus should be not less than 15mm.