A multi-source plant dye-based color matching and continuous dyeing method

Abstract

This invention discloses a color matching and continuous dyeing method based on multi-source plant dyes, belonging to the field of natural textile dyeing technology. The invention includes pretreatment of natural fabric; extraction of pigments from six natural plants to prepare dye solutions; mixing iron mordant and aluminum mordant in a specific ratio to prepare a composite mordant solution; immersing the pretreated fabric in a single-color dye solution or a color-matching dye solution composed of two or more single dye solutions for dyeing; drying the dyed fabric; spraying the surface of the dried fabric with the composite mordant solution; steaming the sprayed fabric for color fixing; soaping the fixed fabric to remove excess dye; and drying the soaped fabric to obtain the dyed finished product. This invention, by constructing a color matching system based on six natural plant dyes, combining a continuous dyeing process, and employing composite mordant technology, can achieve diversified color matching and improve the bonding strength between dyes and fabric fibers.

Description

Technical Field

[0001] This invention belongs to the field of natural textile dyeing technology, and in particular relates to a color matching and continuous dyeing method based on multi-source plant dyes. Background Technology

[0002] With increasing environmental awareness and growing demand for natural textiles, plant-based dyeing technology is gaining attention in the textile industry due to its advantages such as natural raw materials and environmental friendliness. Plant dyes originate from natural plants, contain no harmful components found in chemically synthesized dyes, and the dyed textiles are non-irritating to human skin and can biodegrade naturally after disposal, aligning with the trend of green and environmentally friendly development.

[0003] However, existing plant dyeing technologies still have many shortcomings: First, the colors are limited, with most plant dyeing processes only able to achieve a few basic colors, making it difficult to meet the diverse color matching needs of textiles; second, the color fastness is low, as plant dyes have weak adhesion to fabrics, and they are prone to fading and discoloration after washing and rubbing, affecting the lifespan of textiles; third, the dyeing process is not suitable for continuous production, as most plant dyeing processes use intermittent immersion dyeing processes, resulting in low production efficiency and making it difficult to achieve large-scale mass production; fourth, the mordant dyeing process is imperfect, with existing technologies mostly using a single mordant, which cannot simultaneously ensure color fastness and color vibrancy, and some mordants pose environmental risks.

[0004] Meanwhile, existing plant dyeing methods lack a systematic approach to the selection and combination of natural dyes, with a limited range of commonly used plant dyes and no comprehensive color matching system. Furthermore, the dyeing process largely follows traditional steps of immersion, fixing, and rinsing, without optimizing process parameters for the characteristics of natural fabrics. This results in poor dyeing uniformity, low production efficiency, and an inability to meet the demands of modern continuous production. Therefore, the following solutions are proposed to address these issues. Summary of the Invention

[0005] The purpose of this invention is to provide a color matching and continuous dyeing method based on multi-source plant dyes. By constructing a color matching system based on six natural plant dyes, combining it with a continuous dyeing process, and employing composite mordant technology, it is possible to achieve diversified color matching, improve the binding fastness between dyes and fabric fibers, adapt to continuous large-scale production, and ensure the ecological and environmental protection of the dyeing process and finished products. This solves the problems of limited color selection, insufficient color fastness, difficulty in adapting to continuous production, and the need to improve environmental protection in existing plant dyeing technologies.

[0006] To solve the above-mentioned technical problems, the present invention is achieved through the following technical solution: This invention relates to a color matching and continuous dyeing method based on multi-source plant dyes, comprising the following steps: Step S1: Perform desizing, scouring, and bleaching pretreatment on the natural fabric, and then dry it for later use; Step S2: Extract pigments from six natural plants, namely, indigofera tinctoria, madder root, turmeric, chebula, coffee, and artemisia, to prepare single-color plant dye solutions; Step S3: Mix iron mordant and aluminum mordant in a certain proportion to prepare iron-aluminum composite mordant solution; Step S4: Immerse the pretreated fabric in a single-color dye solution or a mixed dye solution composed of two or more single dye solutions, and dye it using a two-dip and two-paste process. Step S5: Dry the dyed fabric. Step S6: Spray the composite mordant solution onto the dried fabric surface; Step S7: Steam the sprayed fabric to fix its color; Step S8: Perform a soap wash on the dyed fabric to remove loose dye; Step S9: Dry the soap-washed fabric to obtain the dyed finished product.

[0007] Furthermore, the six plant dyes mentioned in step S2 correspond to six basic colors: indigo corresponds to blue, madder corresponds to red, turmeric corresponds to yellow, chebula corresponds to black, coffee corresponds to brown, and mugwort corresponds to green.

[0008] Furthermore, the iron mordant mentioned in step S3 is ferrous sulfate, the aluminum mordant is alum, the mass ratio of the two is 1:2 to 1:3, the concentration of the composite mordant solution is 20 to 50 g / L, and the pH value is adjusted to 6.5 to 7.0.

[0009] Furthermore, the dyeing process described in step S4 is a two-dip and two-padding process, with an immersion temperature of 50-60°C, a padding pressure of 0.2-0.4 MPa, a fabric liquid retention rate controlled at 60%-75%, and a padding speed of 5-10 m / min.

[0010] Furthermore, the color-fixing liquid sprayed in step S6 adopts a double-sided atomized spraying combined with vacuum suction, and the spray volume to fabric weight ratio is 1:1.2 to 1:1.5 to ensure that the color-fixing liquid penetrates evenly into the fiber.

[0011] Furthermore, the steam fixing temperature in step S7 is 100-102°C, and the steaming time is 8-10 minutes, so that iron ions and aluminum ions can undergo complexation reactions with dye molecules and fibers to form a stable bond.

[0012] Furthermore, the soaping treatment described in step S8 uses a neutral soaping solution, the soaping temperature is 60-70°C, the number of soaping cycles is 2, the number of rinsing cycles is 3, and the solution is rinsed until neutral.

[0013] Furthermore, the color-matching dye solution is prepared by mixing two or more single-color plant dye solutions in any proportion in step S2, and is used to mix intermediate or composite colors, including but not limited to green, orange, purple, brown, and olive green.

[0014] Furthermore, the natural fabric is one or more blended fabrics of cotton, linen, silk, and wool, among which linen fabrics have a stronger dye adsorption capacity due to their porous structure.

[0015] The present invention has the following beneficial effects: 1. The color matching system of this invention is based on six natural plant dyes. Through single dyeing or mixed color matching, a rich variety of color combinations can be derived to meet the diverse color needs of textiles. Each dye has a clear source and pure color. After mixing, the color is uniform and natural, which expands the application range of plant dyeing and makes natural dyed products more competitive in terms of color expression.

[0016] 2. This invention employs a mordant process that combines iron and aluminum mordants, resulting in a stronger bond between the dye and the fabric fibers. The composite mordant enhances the adhesion of the dye to the fibers through a complexation reaction, making the dyed finished product less prone to fading during use and maintaining its color for a longer period, thus improving the practicality and durability of plant-dyed textiles.

[0017] 3. The dyeing process of this invention is fully compatible with continuous production lines, with smooth connections between each process and coordinated and unified parameter settings, enabling large-scale production. Compared with the traditional intermittent dyeing method, production efficiency is improved, and the production process is easier to control and manage, providing a feasible technical path for the industrial promotion of plant dyeing.

[0018] 4. All dyes used in this invention are derived from natural plants, and the mordants are non-toxic and harmless inorganic salts. No harmful chemicals are added during the dyeing process. The wastewater generated after dyeing has a simple composition and is easy to treat. The plant dye residue can be naturally degraded. The overall production process is more environmentally friendly and conforms to the development direction of green and environmentally friendly practices.

[0019] 5. The dyeing method of the present invention is applicable to a variety of natural fabrics such as cotton, linen, silk, and wool, as well as blended fabrics. It can achieve good dyeing effects on different types of fibers. After dyeing, the fabric has a soft hand feel and natural color, and retains the excellent characteristics of natural fabrics. It can be widely used in clothing, home textiles, decoration and other fields, and has good applicability.

[0020] Of course, any product implementing this invention does not necessarily need to achieve all of the advantages described above at the same time. Attached Figure Description

[0021] To more clearly illustrate the technical solutions of the embodiments of the present invention, the accompanying drawings used in the description of the embodiments will be briefly introduced below. 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.

[0022] Figure 1 This is a schematic diagram of the process of a color matching and continuous dyeing method based on multi-source plant dyes according to the present invention. Detailed Implementation

[0023] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0024] Please see Figure 1 As shown, this invention provides a color matching and continuous dyeing method based on multi-source plant dyes. The color matching and continuous dyeing method includes the following steps: Step S1: Fabric pretreatment Natural fabrics undergo desizing, scouring, and bleaching to remove surface sizing, impurities, and natural pigments, ensuring uniform dyeing. Desizing utilizes a bio-enzymatic process with pectinase or cellulase to effectively remove sizing without damaging the fabric fibers. Scouring employs a low-alkali process; the optimized alkali scouring parameters are: sodium carbonate 20g / L, sodium sulfite 3g / L, sodium silicate 2g / L, liquor ratio 1:20, temperature 80℃, and time 90min, which improves the dyeing depth. Bleaching uses hydrogen peroxide with parameters of 2-5g / L, temperature 80℃, time 90min, pH 10-11, liquor ratio 1:20, and two bleaching cycles to ensure effective bleaching while minimizing fabric damage. The pre-treated fabric is dried to a moisture content ≤8% for later use. Natural fabrics are selected from one or more blends of cotton, linen, silk, and wool. Among them, linen and other linen fabrics, after pretreatment, can further improve the dyeing effect due to their porous structure and strong adsorption capacity.

[0025] Step S2: Preparation of plant dyes Natural pigments were extracted from Indigofera tinctoria, Madder sinensis, Curcuma longa, Terminalia chebula, coffee, and Artemisia argyi to prepare single-color plant dye solutions for later use. All plant dyes are made from natural plant materials, without any harmful chemical additives, making them eco-friendly. Each dye corresponds to a basic color, allowing for diverse color combinations through mixing. The specific extraction methods for each plant dye solution are as follows: Step S21, Indigo dye solution: Take dried indigo leaves, crush them, add deionized water at a material-to-liquid ratio of 1:100-1:300, boil for 30-40 minutes, cool and filter to remove residue, and take the filtrate as indigo blue dye solution; Indigo is a traditional indigo plant, and the dye solution extracted from it has a pure color, and the blue color is more stable after mordant dyeing.

[0026] Step S22, Madder root dye: Take dried Madder root, crush it, add deionized water at a material-to-liquid ratio of 1:50-1:80, extract at a constant temperature of 80-90℃ for 60-90 minutes, filter and take the filtrate, which is Madder red dye; Madder has a high content of alizarin, and the dyed color is bright and suitable for a variety of natural fabrics.

[0027] Step S23, Turmeric Dye Solution: Take turmeric powder, add deionized water at a material-to-liquid ratio of 1:40-1:60, extract at a constant temperature of 60-70℃ for 40-60 minutes, filter and take the filtrate, which is the turmeric yellow dye solution; turmeric dye is easy to extract, has a bright color, and has certain antibacterial properties.

[0028] Step S24, Terminalia chebula dye solution: Take Terminalia chebula fruit, crush it, add deionized water at a material-to-liquid ratio of 1:60-1:90, boil at 90-100℃ for 60-90 minutes, filter and take the filtrate, which is Terminalia chebula black dye solution; the color of Terminalia chebula dye solution is rich after dyeing, and the color fastness is significantly improved after compound mordant dyeing.

[0029] Step S25, Coffee dye solution: Take coffee grounds, add deionized water at a ratio of 1:20, soak for 30 minutes, then add baking soda to adjust the pH to 7-9, heat to 80-90℃ and extract for 60-90 minutes, cool and filter, and take the filtrate, which is the coffee brown dye solution; the coffee dye solution is prepared using coffee processing waste, realizing resource recycling, and the dyed product has a natural brown color.

[0030] Step S26, Artemisia argyi dye solution: Take dried Artemisia argyi, crush it, add deionized water at a material-to-liquid ratio of 1:50-1:70, extract at a constant temperature of 70-80℃ for 50-70 minutes, filter and take the filtrate, which is the green dye solution of Artemisia argyi; Artemisia argyi dye is natural and environmentally friendly, and the dyed fabric has a light fragrance of Artemisia argyi and excellent antibacterial properties.

[0031] Step S3: Preparation of composite mordant solution Iron and aluminum mordants are mixed in a specific ratio, dissolved in deionized water, and the pH is adjusted to 6.5-7.0 to prepare an iron-aluminum mordant composite mordant solution. Ferrous sulfate is used as the iron mordant, and alum is used as the aluminum mordant. The mass ratio of iron to aluminum mordant is 1:2-1:3, and the concentration of the composite mordant solution is 20-50 g / L. The iron mordant enhances the intensity of the dye color, while the aluminum mordant strengthens the bond between the dye and the fabric. The combined use of these two mordants balances colorfastness and vibrancy, addressing the issues of insufficient colorfastness or dull color when using a single mordant. Simultaneously, controlling the pH of the dye bath at 6.5-7.0 ensures the stability of the dye solution, preventing color shift and the appearance of color spots or uneven coloring.

[0032] Step S4, Immersion-Pad Staining The pretreated natural fabric is immersed in the single-color dye solution or mixed-color dye solution prepared in step S2, using a two-dip, two-padding process. The immersion temperature is 50-60℃ to ensure the fabric fully absorbs the dye. After immersion, padding is performed at a pressure of 0.2-0.4 MPa, controlling the fabric's dye content to 60%-75%. The padding speed is synchronized with the continuous production line at 5-10 m / min to ensure uniform dyeing and suitability for continuous production. The mixed-color dye solution is prepared by mixing two or more of the six single-color plant dye solutions in any proportion. It can be used to create various intermediate colors to achieve color diversification. For example, mixing indigo dye solution and turmeric dye solution can create green tones, and mixing madder dye solution and coffee dye solution can create brownish-red tones, meeting different color matching needs for textiles.

[0033] Step S5: Drying treatment The rolled fabric is fed into a continuous drying machine, with the drying temperature controlled at 90-100℃ and the drying time at 3-6 minutes, until the fabric moisture content is ≤10%. These drying parameters prevent dye decomposition due to high temperature, while ensuring the fabric surface is dry, laying the foundation for subsequent spraying of fixing solution and steam fixing. The drying process is also compatible with continuous production lines, improving production efficiency.

[0034] Step S6: Spraying the fixing solution The composite mordant solution (fixing solution) prepared in step S3 is evenly sprayed onto the dried fabric surface, controlling the spray volume to fabric weight ratio to be 1:1.2-1:1.5 to ensure the fabric surface is evenly covered with the fixing solution without any omissions or accumulation. Using a double-sided spraying method instead of the traditional padding method saves on fixing solution usage, reduces wastewater generation, and provides a more uniform distribution of the fixing solution, improving the fixing effect and adapting to the automation requirements of continuous production. This invention employs atomized spraying combined with vacuum suction, allowing the fixing solution to penetrate more fully into the fabric fibers, further enhancing the uniformity of fixing.

[0035] Step S7: Steam color fixing The fabric, after being sprayed with the color-fixing solution, is fed into a steaming device. The steaming temperature is controlled at 100-102℃, and the steaming time is 8-10 minutes. Through high-temperature steaming, the iron and aluminum ions in the composite mordant solution undergo a complexation reaction with the pigment molecules in the plant dyes and the fabric fibers, forming stable complexes. This achieves a strong bond between the dyes, mordants, and the fabric, significantly improving color fastness. The steaming parameters are optimized to ensure color-fixing effects while avoiding damage to the fabric fibers, and are suitable for continuous production without affecting production efficiency.

[0036] Step S8, Soap Washing Treatment After steam fixing, the fabric is placed in a neutral soaping solution, with the soaping temperature controlled at 60-70℃, and soaped twice to remove surface dye (dye not yet bonded to the fabric). Then, it is rinsed three times with deionized water until neutral. The neutral soaping solution is formulated with 2-5 grams of soap powder per liter, which avoids damage to the fabric and dye color from alkaline soaping solutions, while effectively removing surface dye and preventing fading during subsequent use. The wastewater from the soaping process, after simple filtration, can be recycled for plant dye extraction or fabric rinsing, further improving environmental friendliness.

[0037] Step S9: Drying the finished product The fabric, after being soaped and rinsed, is sent to a continuous drying machine and dried until the moisture content is ≤8%, resulting in the dyed finished product. The dyed finished product has a uniform color, bright colors, high color fastness, and no harmful chemical residues, making it environmentally friendly.

[0038] The color matching system of this invention is based on six single-color plant dyes, which can achieve diverse color matching methods, as follows: 1. Single-color dyeing: Dyeing is carried out directly using the above 6 single-color dye solutions to obtain textiles with 6 basic colors: blue, red, yellow, black, brown, and green. 2. Binary color mixing: Mix two single-color dyes in different proportions. For example, mixing indigo dye (blue) and turmeric dye (yellow) in a 1:1 ratio yields green; mixing madder dye (red) and turmeric dye (yellow) in a 1:1 ratio yields orange; and mixing indigo dye (blue) and madder dye (red) in a 1:1 ratio yields purple. 3. Multi-color mixing: Mix three or more single-color dyes in different proportions to create more complex colors. For example, mixing indigo dye, madder dye, and turmeric dye in a 1:1:1 ratio will produce brown; mixing artemisia dye (green), turmeric dye (yellow), and coffee dye (brownish) in a 2:1:1 ratio will produce olive green, thus meeting the diverse color needs of textiles.

[0039] The specific application of this embodiment is as follows: Example 1: Single-color (blue) dyeing In this embodiment, indigo dye solution is used for single blue staining. The specific steps are as follows: Step S1, Fabric Pretreatment: Select cotton fabric as the natural fabric and perform desizing, scouring, and bleaching treatments. Desizing is performed using pectinase. Scouring is performed using a mixed solution of sodium carbonate 20g / L, sodium sulfite 3g / L, and sodium silicate 2g / L, with a liquor ratio of 1:20, a temperature of 80℃, and a time of 90min. Bleaching is performed using hydrogen peroxide 4g / L, with a temperature of 80℃, a time of 90min, a pH value of 10-11, a liquor ratio of 1:20, and bleaching is performed twice. After treatment, the fabric is dried to a moisture content of 7% and set aside for later use. Step S2, Preparation of Indigo Dye Solution: Take dried Indigo leaves, crush them, add deionized water at a material-to-liquid ratio of 1:200, boil for 35 minutes, cool and filter, and take the filtrate as Indigo blue dye solution for later use. Step S3, Preparation of composite mordant solution: Take ferrous sulfate (iron mordant) and alum (aluminum mordant), mix them in a mass ratio of 1:2, add deionized water and stir to dissolve, prepare a composite mordant solution with a concentration of 30g / L, adjust the pH value to 6.8, and set aside for later use; Step S4, Immersion-Pad Dyeing: Immerse the pretreated cotton fabric in indigo dye solution at a temperature of 50°C and pad it with a pressure of 0.3 MPa, controlling the fabric liquid content to 70% and the padding speed to 10 m / min. Step S5, Drying treatment: The rolled cotton fabric is sent to a continuous drying equipment and dried at 95℃ for 4 minutes until the fabric moisture content is 8%; Step S6, spraying fixing solution: spray the composite mordant solution evenly onto the surface of the dried cotton fabric, controlling the spray amount to the fabric weight ratio to be 1:1.5; Step S7, Steam Fixing: Send the cotton fabric after spraying the fixing liquid into the steaming equipment and steam at 102℃ for 10 minutes. Step S8, Soaping treatment: Place the cotton fabric after steaming and color fixing into a neutral soaping solution prepared with 3g / L soap powder, soap at 65℃, and then rinse 3 times with deionized water until neutral. Step S9, Finished product drying: Dry the cotton fabric after soaping and rinsing to a moisture content of 7% to obtain blue dyed cotton fabric.

[0040] Tests showed that the dry rubbing color fastness of the blue dyed cotton fabric was 4-5, the washing color fastness was 4, and the sunlight color fastness was 4. The color was uniform and pure, with no fading or color variation, and there were no harmful chemical residues.

[0041] Example 2: Binary Mixed Color Matching (Green) Dyeing In this embodiment, indigo dye (blue) and turmeric dye (yellow) are mixed in a 1:1 ratio to prepare a green dye solution for dyeing. The specific steps are as follows: Step S1: Fabric pretreatment: Select linen fabric as the natural fabric, and perform desizing, scouring and bleaching treatments, the same as in Example 1. After treatment, dry to a moisture content of 6% for later use. Step S2, Preparation of plant dye solutions: Prepare indigo dye solution and turmeric dye solution separately. The preparation of indigo dye solution is the same as in Example 1. Preparation of turmeric dye solution: Take turmeric powder, add deionized water at a material-to-liquid ratio of 1:50, extract at 65℃ for 50 minutes, filter and take the filtrate, which is the turmeric yellow dye solution; mix the indigo dye solution and turmeric dye solution at a ratio of 1:1 to obtain a green mixed dye solution for later use. Step S3, Preparation of composite mordant solution: Same as in Example 1; Step S4, Immersion-Pad Dyeing: Immerse the pretreated linen fabric in green mixed dye liquor at a temperature of 60°C. After immersion, pad the fabric with a pressure of 0.25 MPa, control the liquid content of the fabric to 75%, and the padding speed to 7 m / min. Step S5, Drying treatment: The rolled linen fabric is sent into a continuous drying equipment and dried at 95°C for 5 minutes until the fabric moisture content is 9%; Step S6, spraying fixing solution: spray the composite mordant solution evenly onto the surface of the dried linen fabric, controlling the spray amount to the fabric weight ratio to be 1:1.4; Step S7, Steam Fixing: Send the linen fabric after spraying the fixing liquid into the steaming equipment and steam at 102℃ for 10 minutes. Step S8, Soaping treatment: Place the cotton fabric after steaming and color fixing into a neutral soaping solution prepared with 5g / L soap powder, soap at 70℃, and then rinse 3 times with deionized water until neutral. Step S9, Finished product drying: Dry the linen fabric after soap washing and rinsing to a moisture content of 6% to obtain green dyed linen fabric.

[0042] Tests showed that the green dyed linen fabric had a dry rubbing color fastness of 4, a water washing color fastness of 4, and a sunlight color fastness of 3-4. The color was uniform and natural, the green was pure, and there were no other colors or fading, which matched the natural texture of linen fabric.

[0043] Example 3: Multi-color mixing (olive green) dyeing In this embodiment, an olive green dye solution is prepared by mixing artemisia dye (green), turmeric dye (yellow), and coffee dye (brownish) in a ratio of 2:1:1. The specific steps are as follows: Step S1, Fabric pretreatment: Select mulberry silk chiffon fabric as natural fabric, and perform desizing, scouring and bleaching treatment. Desizing is done by gently washing with neutral detergent to remove sericin. Scouring and bleaching are done in the same way as in Example 1. After treatment, dry to a moisture content of 6% for later use. Step S2, Preparation of Plant Dyes: Prepare Artemisia argyi dye, turmeric dye, and coffee dye separately. Artemisia argyi dye preparation: Take dried Artemisia argyi, pulverize it, add deionized water at a material-to-liquid ratio of 1:60, extract at 75℃ for 60 minutes, filter, and collect the filtrate, which is the green Artemisia argyi dye. Turmeric dye preparation is the same as in Example 2. Coffee dye preparation: Take coffee grounds, add deionized water at a material-to-liquid ratio of 1:20, soak for 30 minutes, add baking soda to adjust the pH to 8, heat to 85℃ and extract for 75 minutes, cool, filter, and collect the filtrate, which is the brownish-red coffee dye. Mix the Artemisia argyi dye, turmeric dye, and coffee dye at a ratio of 2:1:1 to obtain an olive green mixed dye, for later use. Step S3: Preparation of composite mordant solution: Take ferrous sulfate and alum, mix them in a mass ratio of 1:2, add deionized water and stir to dissolve, prepare a composite mordant solution with a concentration of 20g / L, adjust the pH value to 6.6, and set aside. Step S4, Immersion-Pad Dyeing: Immerse the pretreated chiffon fabric in green mixed dye liquor at a temperature of 50°C. After immersion, pad the fabric with a pressure of 0.3 MPa, control the liquid content of the fabric to 65%, and the padding speed to 10 m / min. Step S5, Drying treatment: The rolled linen fabric is sent into a continuous drying equipment and dried at 95°C for 5 minutes until the fabric moisture content is 9%; Step S6, spraying fixing solution: spray the composite mordant solution evenly onto the surface of the dried silk fabric, controlling the spray amount to the fabric weight ratio to be 1:1.2; Step S7, Steam Fixing: Send the silk fabric after spraying the fixing liquid into the steaming equipment and steam at 100℃ for 8 minutes. Step S8, Soaping treatment: Place the cotton fabric after steaming and color fixing into a neutral soaping solution prepared with 5g / L soap powder, soap at 70℃, and then rinse 3 times with deionized water until neutral. Step S9, Finished product drying: Dry the soap-washed silk fabric to a moisture content of 7% to obtain olive green dyed silk fabric.

[0044] Tests showed that the olive green dyed silk fabric has a dry rubbing color fastness of 4-5, a water washing color fastness of 4, and a sunlight color fastness of 4. The color is soft and natural, with a faint fragrance of mugwort, and it has excellent antibacterial properties and no harmful chemical residues.

[0045] In the description of this specification, references to terms such as "an embodiment," "example," "specific example," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the invention. In this specification, illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0046] The preferred embodiments of the present invention disclosed above are merely illustrative of the invention. These preferred embodiments do not exhaustively describe all details, nor do they limit the invention to the specific implementations described. Clearly, many modifications and variations can be made based on the content of this specification. This specification selects and specifically describes these embodiments to better explain the principles and practical applications of the invention, thereby enabling those skilled in the art to better understand and utilize the invention. The invention is limited only by the claims and their full scope and equivalents.

Claims

1. A method for color matching and continuous dyeing based on multi-source plant dyes, characterized in that, The color matching and continuous dyeing method includes the following steps: Step S1: Perform desizing, scouring, and bleaching pretreatment on the natural fabric, and then dry it for later use; Step S2: Extract pigments from six natural plants, namely, indigofera tinctoria, madder root, turmeric, chebula, coffee, and artemisia, to prepare single-color plant dye solutions; Step S3: Mix iron mordant and aluminum mordant in a certain proportion to prepare iron-aluminum composite mordant solution; Step S4: Immerse the pretreated fabric in a single-color dye solution or a mixed dye solution composed of two or more single dye solutions, and dye it using a two-dip and two-paste process. Step S5: Dry the dyed fabric. Step S6: Spray the composite mordant solution onto the dried fabric surface; Step S7: Steam the sprayed fabric to fix its color; Step S8: Perform a soap wash on the dyed fabric to remove loose dye; Step S9: Dry the soap-washed fabric to obtain the dyed finished product.

2. The method for color matching and continuous dyeing based on multi-source plant dyes according to claim 1, characterized in that, The six plant dyes mentioned in step S2 correspond to six basic colors: indigo corresponds to blue, madder corresponds to red, turmeric corresponds to yellow, Terminalia chebula corresponds to black, coffee corresponds to brown, and mugwort corresponds to green.

3. The method for color matching and continuous dyeing based on multi-source plant dyes according to claim 1, characterized in that, The iron mordant mentioned in step S3 is ferrous sulfate, and the aluminum mordant is alum. The mass ratio of the two is 1:2 to 1:

3. The concentration of the composite mordant solution is 20 to 50 g / L, and the pH value is adjusted to 6.5 to 7.

0.

4. The method for color matching and continuous dyeing based on multi-source plant dyes according to claim 1, characterized in that, The dyeing process described in step S4 is a two-dip and two-padding process, with an immersion temperature of 50-60℃, a padding pressure of 0.2-0.4MPa, a fabric liquid retention rate of 60%-75%, and a padding speed of 5-10m / min.

5. The method for color matching and continuous dyeing based on multi-source plant dyes according to claim 1, characterized in that, The color-fixing liquid sprayed in step S6 adopts a double-sided atomized spraying combined with vacuum suction. The spray volume to fabric weight ratio is 1:1.2 to 1:1.5 to ensure that the color-fixing liquid penetrates evenly into the fiber.

6. The method for color matching and continuous dyeing based on multi-source plant dyes according to claim 1, characterized in that, The steaming and color-fixing temperature in step S7 is 100-102℃, and the steaming time is 8-10 minutes, so that iron ions and aluminum ions can undergo complexation reactions with dye molecules and fibers to form a stable bond.

7. The method for color matching and continuous dyeing based on multi-source plant dyes according to claim 1, characterized in that, The soaping process described in step S8 uses a neutral soaping solution, the soaping temperature is 60-70℃, the number of soaping cycles is 2, the number of rinsing cycles is 3, and the solution is rinsed until it is neutral.

8. The method for color matching and continuous dyeing based on multi-source plant dyes according to claim 1, characterized in that, The color-matching dye solution is prepared by mixing two or more single-color plant dye solutions in any proportion in step S2, and is used to mix intermediate or composite colors, including but not limited to green, orange, purple, brown, and olive green.

9. The method for color matching and continuous dyeing based on multi-source plant dyes according to claim 1, characterized in that, The natural fabric is one or more blended fabrics of cotton, linen, silk, and wool, among which linen fabrics have a stronger dye adsorption capacity due to their porous structure.

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