Environment-friendly dyeing method of silk blended fabric

Abstract

The invention relates to an environment-friendly dyeing method for a silk blended fabric, in particular to an environment-friendly dyeing method for a silk blended fabric, which comprises the steps of dye dispersion system design, temperature field dynamic regulation and control, dyeing time segmented management and post-treatment process optimization. The dye uniformity is improved through the two-phase dispersing agent, accurate heating is achieved through multi-area temperature control, different fiber requirements are met through segmented management, and energy consumption and fiber damage are reduced through ultrasonic cleaning. According to the design, the dyeing uniformity and efficiency can be remarkably improved, the energy consumption and the environmental influence are reduced, meanwhile, the silk fiber performance is protected, and high practical value and popularization prospects are achieved.

Description

Technical Field

[0001] The invention relates to the technical field of textile dyeing and finishing, in particular to the field of an environmentally friendly dyeing method for silk blended fabrics. Background Art

[0002] With the rapid development of the textile industry, environmentally friendly dyeing technology has gradually become a research hotspot because of its characteristics of being environmentally friendly and having high resource utilization. However, the existing environmentally friendly dyeing method still has some shortcomings in the dyeing process for silk blended fabrics, which affects the dyeing effect, production efficiency and environmental performance. For example, the patent document with publication number CN105603777B and patent name being a method for dyeing with a blue-green color discloses a method for dyeing with a blue-green color. The method dyes the fabric by heating, keeping warm and cooling in steps, and combines subsequent washing and reduction cleaning processes to achieve good dyeing effect and environmental performance. However, the technical solution is mainly designed for ordinary blended fabrics, and does not fully consider the particularity of silk blended fabrics, such as the fineness of silk fibers and the uniqueness of dye adsorption capacity. In addition, the method involves multiple temperature adjustment and cleaning steps, which may lead to higher energy consumption and cause certain damage to the silk fibers, thereby affecting the feel and gloss of the fabric.

[0003] The above issues indicate that existing environmentally friendly dyeing technologies for silk blended fabrics still have room for improvement in terms of adaptability, process complexity, energy consumption control, and finished product quality. Therefore, the present invention aims to provide a novel environmentally friendly dyeing method for silk blended fabrics that optimizes the dyeing process, improves dyeing uniformity and finished product quality, while reducing energy consumption and environmental impact, thereby meeting the textile industry's demand for efficient, environmentally friendly dyeing technologies. Summary of the Invention

[0004] The purpose of the present invention is to provide an environmentally friendly dyeing method for silk blended fabrics, aiming to solve the problems of complex process, high energy consumption, uneven dyeing and great damage to fibers in the dyeing process of silk blended fabrics in the prior art.

[0005] The present invention provides the following technical solutions: an environmentally friendly dyeing method for silk blended fabrics, S1. Prepare a dye dispersion: Mix a hydrophilic dispersant and a hydrophobic dispersant in a mass ratio of 1:3-1:5 and dissolve them in deionized water to form a preliminary dye dispersion, add nano-scale silica particles in an amount of 0.1%-0.5% of the total mass of the dye dispersion, and stir to obtain a dye dispersion; S2. Set temperature control zones: Divide the dyeing tank into a low-temperature temperature control zone, a medium-temperature temperature control zone, and a high-temperature temperature control zone. The low-temperature temperature control zone is 40°C-45°C, the medium-temperature temperature control zone is 50°C-55°C, and the high-temperature temperature control zone is 60°C-65°C. Place the fabric to be dyed in the dyeing tank. S3, dyeing: the dyeing process is divided into a pre-dyeing stage, a main dyeing stage and a fixing stage, wherein the pre-dyeing stage lasts 10 minutes to 15 minutes, the main dyeing stage lasts 20 minutes to 30 minutes, and the fixing stage lasts 15 minutes to 20 minutes; S4. Post-treatment: In the post-treatment process, the fabric to be dyed and the weak alkaline cleaning solution are placed in a cleaning tank and ultrasonically cleaned using an ultrasonic cleaning device. The pH value of the weak alkaline cleaning solution is 8.5-9.0, the ultrasonic frequency is 20kHz-40kHz, and the cleaning time is 5 minutes to 10 minutes. Subsequently, low-temperature negative pressure drying technology is adopted, the drying temperature is 40℃-50℃, and the negative pressure value is -0.05MPa to -0.08MPa.

[0006] Preferably, the fabric to be dyed is a blend of silk and synthetic fibers or a blend of silk and natural fibers.

[0007] Preferably, in the step S1, the particle size of the nano-scale silica particles is in the range of 10 nm to 50 nm.

[0008] Preferably, in the step S1, the hydrophilic dispersant and the hydrophobic dispersant are dissolved in deionized water respectively, with a stirring speed of 300 rpm to 500 rpm and a stirring time of 10 minutes to 15 minutes, and the stirring is continued for 5 minutes to 10 minutes after the nano-sized silica particles are added.

[0009] Preferably, in the S3 step, a circulation pump is provided in the dyeing tank, and a liquid inlet and a liquid outlet are provided on the circulation pump. The liquid inlet is arranged at the bottom of the dyeing tank, and the liquid outlet is arranged at the top of the dyeing tank, and the liquid inlet and the liquid outlet are arranged diagonally opposite to each other.

[0010] Preferably, the dye dispersion in the dyeing tank circulates through the circulation pump at a flow rate of 0.5 m / s-1.0 m / s.

[0011] Preferably, in the step S3, the fabric to be dyed stays in the low-temperature temperature-controlled area for 10 to 15 minutes, the fabric to be dyed stays in the medium-temperature temperature-controlled area for 20 to 30 minutes, and the fabric to be dyed stays in the high-temperature temperature-controlled area for 15 to 20 minutes.

[0012] Preferably, in the step S4, the weak alkaline cleaning solution is prepared from deionized water and sodium carbonate solution, and the amount of sodium carbonate added is 0.2%-0.5% of the total mass of the weak alkaline cleaning solution.

[0013] Preferably, in the step S4, the ultrasonic cleaning device is arranged at the bottom of the cleaning tank.

[0014] Preferably, in the step S4, the low-temperature negative pressure drying time is 20 minutes to 30 minutes, the temperature of the drying oven is set to 40°C to 50°C, and the air pressure is reduced to -0.05 MPa to -0.08 MPa by a vacuum pump.

[0015] Compared with the prior art, the present invention has the following beneficial effects: 1. The environmentally friendly dyeing method of silk blended fabrics of the present invention solves the problem of uneven dye adsorption during the dyeing process of silk blended fabrics through the design of a dye system with a dual-phase dispersant, and significantly improves the dyeing uniformity. 2. The environmentally friendly dyeing method for silk blended fabrics of the present invention introduces a multi-zone temperature control system to achieve precise control of the dyeing temperature field, reducing the risk of dyeing defects caused by temperature fluctuations.

[0016] 3. The environmentally friendly dyeing method for silk blended fabrics of the present invention fully considers the dyeing requirements of different fiber components through segmented management of dyeing time, thereby improving dyeing efficiency and finished product quality.

[0017] 4. The environmentally friendly dyeing method for silk blended fabrics of the present invention effectively reduces the number of water washings and energy consumption through a post-treatment process based on ultrasonic cleaning, while protecting the physical properties of the silk fibers. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative labor.

[0019] Figure 1 Schematic diagram of the steps of the environmentally friendly dyeing method for silk blended fabrics of the present invention; Figure 2 Schematic diagram of the structure of the dyeing tank of the environmentally friendly dyeing method of silk blended fabrics of the present invention; Figure 3 The figure is a schematic structural diagram of a cleaning tank for the environmentally friendly dyeing method of silk blended fabrics according to the present invention.

[0020] In the accompanying drawings, 1. dyeing tank, 11. low-temperature temperature control area, 111. heating device, 112. temperature sensor, 12. medium-temperature temperature control area, 13. high-temperature temperature control area; 2. circulation pump, 21. liquid inlet, 22. liquid outlet; 3. cleaning tank; 4. ultrasonic cleaning device. DETAILED DESCRIPTION

[0021] The embodiments of the present application are described in detail below, and examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present application, and should not be understood as limiting the present application.

[0022] In the description of this application, it should be understood that the terms "first" and "second" are used for descriptive purposes only and should not be understood to indicate or imply relative importance or implicitly specify the number of the technical features indicated. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include one or more of the described features. In the description of this application, "plurality" means two or more, unless otherwise specifically defined.

[0023] In the description of this application, it should be noted that, unless otherwise expressly specified or limited, the terms "installed" and "connected" should be understood in a broad sense. For example, they can refer to fixed connections, detachable connections, or integral connections; they can refer to mechanical connections, electrical connections, or mutual communication; they can refer to direct connections or indirect connections through an intermediate medium; they can refer to internal communication between two components or the interaction between two components. Those skilled in the art will understand the specific meanings of the above terms in this application based on the specific circumstances.

[0024] In the description of this application, it should be understood that the terms "upper", "lower", "side", "front", "rear", etc. indicate orientations or positional relationships based on the installation, and are only for the convenience of describing this application and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on this application.

[0025] In the description of this application, it should be noted that the term "and / or" is merely a description of the association relationship of associated objects, indicating that three relationships may exist. For example, A and / or B can represent three situations: A exists alone, A and B exist at the same time, and B exists alone.

[0026] It should also be noted that, in the embodiments of the present application, the same figure mark represents the same component or the same part. For the same parts in the embodiments of the present application, the figure may only mark one of the parts or components as an example. It should be understood that the figure mark also applies to other identical parts or components.

[0027] In addition, in this application, the technical features described in an open manner include closed technical solutions composed of the listed features, and also include open technical solutions containing the listed features.

[0028] To further understand the content, features and effects of the present invention, the following embodiments are given as examples and described in detail with reference to the accompanying drawings: like Figure 1-3 As shown, an environmentally friendly dyeing method for silk blended fabrics, the dyeing method comprises the following steps: preparing a dye dispersion: mixing a hydrophilic dispersant and a hydrophobic dispersant in a mass ratio of 1:3-1:5 and dissolving them in deionized water to form a preliminary dye dispersion, adding nano-scale silica particles in an amount of 0.1%-0.5% of the total mass of the dye dispersion, and stirring to obtain a dye dispersion; setting temperature control areas: dividing a dyeing tank 1 into a low-temperature temperature control area 11, a medium-temperature temperature control area 12 and a high-temperature temperature control area 13, the low-temperature temperature control area 11 is 40°C-45°C, the medium-temperature temperature control area 12 is 50°C-55°C, and the high-temperature temperature control area 13 is 60°C-65°C, placing the fabric to be dyed in a In the dyeing tank 1; Dyeing: The dyeing process is divided into a pre-dyeing stage, a main dyeing stage and a fixing stage. The time of the pre-dyeing stage is 10 minutes to 15 minutes, the main dyeing stage is 20 minutes to 30 minutes, and the fixing stage is 15 minutes to 20 minutes; Post-treatment: In the post-treatment process, the fabric to be dyed and the weak alkaline cleaning solution are placed in the cleaning tank 3, and ultrasonic cleaning is performed by an ultrasonic cleaning device 4. The pH value of the weak alkaline cleaning solution is 8.5-9.0, the ultrasonic frequency is 20kHz-40kHz, and the cleaning time is 5 minutes to 10 minutes. Subsequently, low-temperature negative pressure drying technology is adopted, the drying temperature is 40℃-50℃, and the negative pressure value is -0.05MPa to -0.08MPa.

[0029] In order to better understand the application method of the cyanotype process on vegetable tanned leather in this application, the application method is further explained below: S1. Prepare dye dispersion: Mix a hydrophilic dispersant and a hydrophobic dispersant in a mass ratio of 1:3-1:5 and dissolve them in deionized water to form a preliminary dye dispersion, add nano-scale silica particles in an amount of 0.1%-0.5% of the total mass of the dye dispersion, and stir evenly to obtain a dye dispersion; the nano-scale silica particles 2 are evenly distributed in the dispersion, and through physical adsorption, they synergize with the two-phase dispersant to further improve the dispersion stability of the dye. The hydrophilic dispersant in the two-phase dispersant mainly acts on the surface of the blended fiber, and enhances the adhesion of the dye to the blended fiber through the electrostatic adsorption mechanism; the hydrophobic dispersant targets the surface characteristics of the silk fiber and uses the intermolecular van der Waals force to promote the penetration of the dye into the silk fiber; S2. Setting temperature control areas: Divide the dyeing tank into a low-temperature temperature control area 11, a medium-temperature temperature control area 12 and a high-temperature temperature control area 13. The low-temperature temperature control area 11 is 40°C-45°C, the medium-temperature temperature control area 1250°C-55°C, and the lower temperature control area 60°C-65°C. Place the fabric to be dyed in the dyeing tank; in the early stage of dyeing, the temperature of the low-temperature temperature control area 11 is set to 40°C to 45°C. This temperature range can effectively promote the initial adsorption of dye molecules on the surface of the blended fiber; the temperature of the medium-temperature temperature control area 12 is maintained at 50°C to 55°C, which helps the dye molecules penetrate into the interior of the silk fiber; the temperature of the high-temperature temperature control area 13 is gradually increased to 60°C to 65°C to complete the final fixation of the dye; by using the zoned temperature control method, the problem of uneven dyeing caused by temperature fluctuations in the traditional dyeing method is avoided, and the overall energy consumption is reduced. S3. Dyeing: The dyeing process is divided into the pre-dyeing stage, the main dyeing stage and the fixing stage. The pre-dyeing stage lasts 10-15 minutes. The main purpose of this stage is to evenly distribute the dye on the fiber surface to ensure the smooth progress of the subsequent dyeing process. The main dyeing stage lasts 20-30 minutes. The focus is on promoting the penetration of the dye into the fiber and improving the dyeing depth and uniformity. The fixing stage lasts 15-20 minutes and is used to complete the final fixation of the dye and enhance the color fastness. S4, post-treatment: In the post-treatment process, the fabric to be dyed and the weak alkaline cleaning solution are placed in the cleaning tank 3, and ultrasonic cleaning is performed by the ultrasonic cleaning device 4. The pH value of the weak alkaline cleaning solution is 8.5-9.0, the ultrasonic frequency is 20kHz-40kHz, and the cleaning time is 5 minutes-10 minutes. Subsequently, low-temperature negative pressure drying technology is adopted, the drying temperature is 40℃-50℃, and the negative pressure value is -0.05MPa to -0.08MPa. The negative pressure environment accelerates water evaporation and avoids damage to the silk fibers by high temperature. After drying, a silk blended fabric with uniform dyeing and soft feel can be obtained.

[0030] In one embodiment, the fabric to be dyed is a blend of silk and synthetic fibers or a blend of silk and natural fibers. Of course, it can also be other silk blended fabrics.

[0031] In one embodiment, in step S1, the particle size of the nano-sized silica particles is in the range of 10 nm to 50 nm. The silica particles 2 in this particle size range are evenly distributed in the dispersion, and the dispersion stability of the dye is further improved by the synergistic effect of physical adsorption and the two-phase dispersant. In one embodiment, in step S1, the hydrophilic dispersant and the hydrophobic dispersant are dissolved in deionized water respectively, with a stirring speed of 300 rpm-500 rpm and a stirring time of 10 minutes-15 minutes. After the nano-sized silica particles are added, stirring is continued for 5 minutes-10 minutes.

[0032] In one embodiment, Figure 2 As shown, in step S3, a circulating pump 2 is provided in the dyeing tank 1. The circulating pump 2 is provided with a liquid inlet 21 and a liquid outlet 22. The liquid inlet 21 is provided at the bottom of the dyeing tank 1, and the liquid outlet 22 is provided at the top of the dyeing tank 1. The liquid inlet 21 and the liquid outlet 22 are arranged diagonally opposite each other. By providing the circulating pump, the fuel dispersion in the dyeing tank can be circulated to prevent dye precipitation. Of course, this is not limited to this, and other methods can be used to circulate the fuel dispersion in the dyeing tank.

[0033] In one embodiment, the low-temperature control zone 11, the medium-temperature control zone 12, and the high-temperature control zone 13 are each equipped with an independent heating device 111 and a temperature sensor 112. The heating device can heat the dye dispersion within the temperature control zone, and the temperature sensor facilitates the operator to control the temperature of each temperature control zone. Of course, this is not limited to this embodiment, and other temperature control devices can be used.

[0034] In one embodiment, the dye dispersion in the dyeing tank 1 is circulated by a circulation pump at a flow rate of 0.5 m / s to 1.0 m / s. During the dyeing process, the dye dispersion is circulated by the circulation pump in the dyeing tank 1 at a flow rate controlled between 0.5 m / s and 1.0 m / s to ensure uniform distribution of the dye within the dyeing tank 1. This circulation prevents dye precipitation and improves dyeing efficiency.

[0035] In one embodiment, in step S3, the fabric to be dyed stays in the low-temperature control zone 11 for 10 to 15 minutes, in the medium-temperature control zone 12 for 20 to 30 minutes, and in the high-temperature control zone 13 for 15 to 20 minutes. This zoned temperature control avoids the uneven dyeing problem caused by temperature fluctuations in traditional dyeing methods and reduces overall energy consumption.

[0036] In one embodiment, in step S4, the weakly alkaline cleaning solution is prepared from deionized water and sodium carbonate solution, with the sodium carbonate added in an amount of 0.2%-0.5% of the total mass of the weakly alkaline cleaning solution. This ensures a stable pH of the cleaning solution to avoid fiber performance degradation or dye backstaining caused by pH fluctuations.

[0037] In one embodiment, Figure 3 As shown, in step S4, an ultrasonic cleaning device 4 is disposed at the bottom of the cleaning tank 3. By combining the ultrasonic wave with the cleaning tank, the cavitation effect of the ultrasonic wave can be utilized to accelerate the removal of the dye residue. Of course, this is not limited to this, and other methods can be used to accelerate the removal of the dye residue.

[0038] In one embodiment, in step S4, the low-temperature negative pressure drying time is 20 minutes to 30 minutes, the drying oven is set at a temperature of 40°C to 50°C, and the air pressure is reduced to -0.05 MPa to -0.08 MPa by a vacuum pump. The negative pressure environment accelerates water evaporation while preventing damage to silk fibers caused by high temperatures. After drying, a silk blended fabric with uniform dyeing and a soft feel can be obtained.

[0039] Some specific examples are listed below. It should be noted that the following examples do not exhaust all possible situations, and the materials used in the following examples can be obtained from commercial channels unless otherwise specified. Example 1:

[0040] S1. Preparing a dye dispersion: mixing a hydrophilic dispersant and a hydrophobic dispersant in a mass ratio of 1:4 and dissolving them in deionized water to form a preliminary dye dispersion, adding nano-scale silica particles having a particle size range of 30 nm and an addition amount of 0.3% of the total mass of the dye dispersion, and stirring to obtain a dye dispersion; The hydrophilic dispersant and the hydrophobic dispersant were dissolved in deionized water respectively, with a stirring speed of 400 rpm for 12 minutes. After the nano-sized silica particles were added, stirring was continued for 8 minutes.

[0041] S2. Set temperature control zones: Divide the dyeing tank into a low-temperature temperature control zone 11, a medium-temperature temperature control zone 12, and a high-temperature temperature control zone 13. The low-temperature temperature control zone 11 is set at 42°C, the medium-temperature temperature control zone 12 is set at 52°C, and the high-temperature temperature control zone 13 is set at 62°C. Place the fabric to be dyed in the dyeing tank. A circulation pump is provided in the dyeing tank, and the dye dispersion in the dyeing tank circulates through the circulation pump at a flow rate of 0.7 m / s.

[0042] The fabric to be dyed stays in the low temperature control area 11 for 12 minutes, the fabric to be dyed stays in the medium temperature control area 12 for 25 minutes, and the fabric to be dyed stays in the high temperature control area 13 for 18 minutes. S3, Dyeing: The dyeing process is divided into a pre-dyeing stage, a main dyeing stage, and a fixation stage. During the pre-dyeing stage, the fabric to be dyed remains in a low-temperature temperature-controlled area 11 for 12 minutes. During the main dyeing stage, the fabric to be dyed remains in a medium-temperature temperature-controlled area 12 for 20-30 minutes. During the fixation stage, the fabric to be dyed remains in a high-temperature temperature-controlled area 13 for 18 minutes. During the dyeing process, the dye dispersion is circulated in the dyeing tank 1 by a circulation pump at a flow rate of 0.7 m / s to ensure uniform distribution of the dye in the dyeing tank. This circulation method prevents dye precipitation and improves dyeing efficiency.

[0043] S4. Post-treatment: In the post-treatment process, ultrasonic cleaning is performed using a weak alkaline cleaning solution with a pH of 8.7, an ultrasonic frequency of 30 kHz, and a cleaning time of 8 minutes. Low-temperature negative pressure drying technology is then used, with a drying temperature of 45°C and a negative pressure of -0.06 MPa. The weak alkaline cleaning solution is prepared from deionized water and sodium carbonate solution, with the sodium carbonate added in an amount of 0.3% of the total mass of the weak alkaline cleaning solution. The low-temperature negative pressure drying time is 25 minutes, and the drying oven is set at 45°C. The air pressure is reduced to -0.06 MPa using a vacuum pump. Example 2:

[0044] S1. Preparing a dye dispersion: mixing a hydrophilic dispersant and a hydrophobic dispersant in a mass ratio of 1:3 and dissolving them in deionized water to form a preliminary dye dispersion, adding nano-scale silica particles with a particle size range of 10 nm and an addition amount of 0.1% of the total mass of the dye dispersion, and stirring to obtain a dye dispersion; The hydrophilic dispersant and the hydrophobic dispersant were dissolved in deionized water respectively, with a stirring speed of 300 rpm for 10 minutes. After the nano-sized silica particles were added, stirring was continued for 5 minutes.

[0045] S2. Set temperature control zones: Divide the dyeing tank into a low-temperature temperature control zone 11, a medium-temperature temperature control zone 12, and a high-temperature temperature control zone 13. The low-temperature temperature control zone 11 is set at 40°C, the medium-temperature temperature control zone 12 is set at 50°C, and the high-temperature temperature control zone is set at 60°C. Place the fabric to be dyed in the dyeing tank. A circulation pump is provided in the dyeing tank, and the dye dispersion in the dyeing tank circulates through the circulation pump at a flow rate of 0.5m / s; The fabric to be dyed stays in the low temperature control area 11 for 10 minutes, the fabric to be dyed stays in the medium temperature control area 12 for 20 minutes, and the fabric to be dyed stays in the high temperature control area 13 for 15 minutes; S3. Dyeing: The dyeing process is divided into a pre-dyeing stage, a main dyeing stage, and a color fixation stage. During the pre-dyeing stage, the fabric to be dyed remains in a low-temperature controlled area 11 for 10 minutes. During the main dyeing stage, the fabric to be dyed remains in a medium-temperature controlled area 12 for 20 minutes. During the color fixation stage, the fabric to be dyed remains in a high-temperature controlled area 13 for 15 minutes. During the dyeing process, the dye dispersion is circulated in the dyeing tank by a circulation pump at a flow rate of 0.5 m / s to ensure uniform distribution of the dye in the dyeing tank 1. This circulation prevents dye precipitation and improves dyeing efficiency.

[0046] S4. Post-treatment: In the post-treatment process, ultrasonic cleaning is performed using a weak alkaline cleaning solution with a pH value of 8.5-9.0, an ultrasonic frequency of 20kHz, and a cleaning time of 5 minutes. Low-temperature negative pressure drying technology is then used, with a drying temperature of 40°C and a negative pressure of -0.05MPa. The weak alkaline cleaning solution is prepared from deionized water and sodium carbonate solution, with the amount of sodium carbonate added being 0.2% of the total mass of the weak alkaline cleaning solution. The low-temperature negative pressure drying time is 20 minutes, and the drying oven is set at 40°C. The air pressure is reduced to -0.05MPa using a vacuum pump. Example 3:

[0047] S1. Preparing a dye dispersion: mixing a hydrophilic dispersant and a hydrophobic dispersant in a mass ratio of 1:5 and dissolving them in deionized water to form a preliminary dye dispersion, adding nano-scale silica particles having a particle size range of 50 nm and an addition amount of 0.5% of the total mass of the dye dispersion, and stirring to obtain a dye dispersion; The hydrophilic dispersant and the hydrophobic dispersant were dissolved in deionized water respectively, with a stirring speed of 500 rpm for 15 minutes. After the nano-sized silica particles were added, the stirring was continued for 10 minutes.

[0048] S2. Set temperature control zones: Divide the dyeing tank into a low-temperature control zone 11, a medium-temperature control zone 12, and a high-temperature control zone 13. The low-temperature control zone 11 is set at 45°C, the medium-temperature control zone 12 is set at 55°C, and the high-temperature control zone 13 is set at 65°C. Place the fabric to be dyed in the dyeing tank. A circulation pump is provided in the dyeing tank, and the dye dispersion in the dyeing tank circulates through the circulation pump at a flow rate of 0.1.0m / s; The fabric to be dyed stays in the low temperature control area 11 for 15 minutes, the fabric to be dyed stays in the medium temperature control area 12 for 30 minutes, and the fabric to be dyed stays in the high temperature control area 13 for 20 minutes. S3. Dyeing: The dyeing process is divided into a pre-dyeing stage, a main dyeing stage, and a color fixation stage. During the pre-dyeing stage, the fabric to be dyed remains in a low-temperature temperature-controlled area 11 for 15 minutes. During the main dyeing stage, the fabric to be dyed remains in a medium-temperature temperature-controlled area 12 for 30 minutes. During the color fixation stage, the fabric to be dyed remains in a high-temperature temperature-controlled area 13 for 20 minutes. During the dyeing process, the dye dispersion is circulated in the dyeing tank by a circulation pump at a flow rate of 1.0 m / s to ensure uniform distribution of the dye in the dyeing tank. This circulation method prevents dye precipitation and improves dyeing efficiency.

[0049] S4. Post-treatment: In the post-treatment process, ultrasonic cleaning is performed using a weak alkaline cleaning solution with a pH of 9.0, an ultrasonic frequency of 40 kHz, and a cleaning time of 10 minutes. Low-temperature negative pressure drying technology is then used, with a drying temperature of 50°C and a negative pressure of -0.08 MPa. The weak alkaline cleaning solution is prepared from deionized water and sodium carbonate solution, with the sodium carbonate added in an amount of 0.5% of the total mass of the weak alkaline cleaning solution. The low-temperature negative pressure drying time is 30 minutes, and the drying oven is set at 50°C. The air pressure is reduced to -0.08 MPa using a vacuum pump.

[0050] Comparative Example 1: The treatment process of Comparative Example 1 is basically the same as that of Example 1, but in step S1 of Comparative Example 1, no hydrophobic dispersant is added and no nano-silica is added.

[0051] Comparative Example 2: The processing process of Comparative Example 2 is basically the same as that of Example 1, but in step S2 of Comparative Example 2, a single temperature control zone is used, and the temperature is linearly increased from 40°C to 65°C.

[0052] Comparative Example 3: The treatment process of Comparative Example 3 is basically the same as that of Example 1, but in step S4 of Comparative Example 3, a strong alkaline cleaning solution of PH11 is used without ultrasonic assistance.

[0053] Comparative Example 4: The treatment process of Comparative Example 3 is basically the same as that of Example 1, but in step S4 of Comparative Example 4, hot air drying at 80° C. and normal pressure is adopted after dyeing, without a negative pressure environment.

[0054] Further analysis of the comparative examples shows that in comparative example 1, no hydrophobic dispersant and no nano-silica are added when preparing the dye dispersion. Insufficient hydrophobicity leads to uneven dyeing of the silk fibers and excessive fuel adsorption of the blended fibers; the dyeing fastness is reduced by 15%; in comparative example 2, there is no zoned temperature control dyeing, which leads to fuel hydrolysis of the blended fibers in the high temperature stage and insufficient penetration of the silk fibers in the low temperature stage, and the dyeing uniformity is 20% lower than that of Example 1; comparative example 3 uses traditional strong alkali cleaning, and the silk fibers are damaged in a strong alkaline environment, and the breaking strength decreases by 18% compared with Example 1. The fabric feels rougher than Example 1, and the water consumption is three times that of Example 1; comparative example 4 uses high-temperature dyeing without negative pressure, which makes the silk fibers yellow, with a color difference △E>2, while the fabric of Example 1 has a △E<0.5.

[0055] The technical features of the above-mentioned embodiments can be combined arbitrarily. In order to make the description concise, not all possible combinations of the technical features in the above-mentioned embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0056] The above-described embodiments merely illustrate several implementations of the present invention, and while their descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the patent. It should be noted that a person skilled in the art would be able to make numerous variations and improvements without departing from the spirit of the present invention, all of which fall within the scope of protection of the present invention. Therefore, the scope of protection of the patent for this invention shall be determined by the appended claims.

Claims

1. An environmentally friendly dyeing method for silk blended fabrics, characterized by: S1. Prepare a dye dispersion: Mix a hydrophilic dispersant and a hydrophobic dispersant in a mass ratio of 1:3-1:5 and dissolve them in deionized water to form a preliminary dye dispersion, add nano-scale silica particles in an amount of 0.1%-0.5% of the total mass of the dye dispersion, and stir to obtain a dye dispersion; S2. Setting temperature control areas: Divide the dyeing tank (1) into a low-temperature temperature control area (11), a medium-temperature temperature control area (12), and a high-temperature temperature control area (13), wherein the low-temperature temperature control area (11) is 40°C-45°C, the medium-temperature temperature control area (12) is 50°C-55°C, and the high-temperature temperature control area is 60°C-65°C. Place the fabric to be dyed in the dyeing tank (1); S3, dyeing: the dyeing process is divided into a pre-dyeing stage, a main dyeing stage and a fixing stage, wherein the pre-dyeing stage lasts 10 minutes to 15 minutes, the main dyeing stage lasts 20 minutes to 30 minutes, and the fixing stage lasts 15 minutes to 20 minutes; S4. Post-treatment: In the post-treatment process, the fabric to be dyed and the weak alkaline cleaning solution are placed in a cleaning tank (3) and ultrasonically cleaned by an ultrasonic cleaning device (4). The pH value of the weak alkaline cleaning solution is 8.5-9.0, the ultrasonic frequency is 20kHz-40kHz, and the cleaning time is 5 minutes-10 minutes. Subsequently, a low-temperature negative pressure drying technology is used, the drying temperature is 40℃-50℃, and the negative pressure value is -0.05MPa to -0.08MPa.

2. The environmentally friendly dyeing method for silk blended fabrics according to claim 1, characterized in that: The fabric to be dyed is a blend of silk and synthetic fibers or a blend of silk and natural fibers.

3. The environmentally friendly dyeing method for silk blended fabrics according to claim 1 or 2, characterized in that: In the step S1, the particle size of the nano-scale silica particles ranges from 10 nm to 50 nm.

4. The environmentally friendly dyeing method for silk blended fabrics according to claim 3, characterized in that: In the step S1, the hydrophilic dispersant and the hydrophobic dispersant are dissolved in deionized water respectively, with a stirring speed of 300 rpm to 500 rpm and a stirring time of 10 minutes to 15 minutes. After the nano-sized silica particles are added, stirring is continued for 5 minutes to 10 minutes.

5. The environmentally friendly dyeing method for silk blended fabrics according to claim 4, characterized in that: In the step S3, a circulation pump (2) is provided in the dyeing tank (1), and a liquid inlet (21) and a liquid outlet (22) are provided on the circulation pump (2), wherein the liquid inlet (21) is provided at the bottom of the dyeing tank (1), and the liquid outlet (22) is provided at the top of the dyeing tank (1), and the liquid inlet (21) and the liquid outlet (22) are provided diagonally opposite to each other.

6. The environmentally friendly dyeing method for silk blended fabrics according to claim 4 or 5, characterized in that: The dye dispersion in the dyeing tank (1) circulates through the circulation pump (2) at a flow rate of 0.5 m / s-1.0 m / s.

7. The environmentally friendly dyeing method for silk blended fabrics according to claim 6, characterized in that: In the step S3, the fabric to be dyed stays in the low-temperature temperature-controlled area (11) for 10 to 15 minutes, the fabric to be dyed stays in the medium-temperature temperature-controlled area (12) for 20 to 30 minutes, and the fabric to be dyed stays in the high-temperature temperature-controlled area (13) for 15 to 20 minutes.

8. The environmentally friendly dyeing method for silk blended fabrics according to claim 7, characterized in that: In the step S4, the weak alkaline cleaning solution is prepared from deionized water and sodium carbonate solution, and the amount of sodium carbonate added is 0.2%-0.5% of the total mass of the weak alkaline cleaning solution.

9. The environmentally friendly dyeing method for silk blended fabrics according to claim 8, characterized in that: In the step S4, the ultrasonic cleaning device (4) is arranged at the bottom of the cleaning tank (3).

10. The environmentally friendly dyeing method for silk blended fabrics according to claim 9, characterized in that: In the step S4, the low-temperature negative pressure drying time is 20 minutes to 30 minutes, the temperature of the drying oven is set at 40°C to 50°C, and the air pressure is reduced to -0.05MPa to -0.08MPa by a vacuum pump.

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