A method of dyeing a fabric

Abstract

The application discloses a fabric dyeing method and a dyed fabric, and the fabric dyeing method comprises the following steps: step 1, adding blue side gerbera into water at 20-30 DEG C and stirring uniformly, filtering after soaking to obtain blue side gerbera pigment extract; step 2, diluting the blue side gerbera pigment extract with water to obtain a dye liquor; and step 3, placing pretreated fabric to be dyed in the dye liquor and dyeing at 20-30 DEG C. The fabric dyeing method uses the blue side gerbera pigment extract as a dye, and dyes the fabric at a specific temperature, so that a purple-dyed fabric can be obtained, and the obtained fabric has excellent color development and color fastness. The application enriches the plant dyeing color system and provides a new way for the value-added utilization of characteristic plant resources in alpine regions.

Description

Technical Field

[0001] This invention belongs to the field of fabric dyeing technology, specifically relating to a dyeing method for fabrics using indigo marigold as dye. Background Technology

[0002] my country has a long tradition of using plant dyes to color fabrics. Plant dyes not only offer natural and elegant colors with a pleasant fragrance, but they are also a renewable dye resource with good biodegradability and environmental compatibility. Plant dyes are non-toxic and harmless, non-allergenic and non-carcinogenic to the skin, and many have antibacterial and UV-protective properties. As more and more people pay attention to their health, the demand for green products and green consumption is gradually increasing, and fabrics dyed with plant dyes are becoming increasingly popular. However, existing plant dyes still have some problems in practical applications, mainly poor color development and color fastness, which limit their widespread use.

[0003] Blue-flowered Calendula (also known as Blue-flowered Calendula) is a perennial herbaceous plant belonging to the Ranunculaceae family. It is mainly distributed in alpine meadows at altitudes of 2300-5000 meters in Xinjiang, Qinghai, and Tibet, my country, and has high medicinal value. According to the *Chinese Materia Medica*, Blue-flowered Calendula is bitter and cold in nature, possessing the effects of clearing heat and drying dampness, and killing parasites. It is mainly used to treat scabies and stubborn tinea, and is also used externally as a powder applied to affected areas. Furthermore, *Commonly Used Chinese Herbal Medicines of Xinjiang* records that the whole plant has cardiotonic and diuretic effects. Modern chemical composition research shows that Blue-flowered Calendula contains abundant anthocyanins, flavonoids, arvense glycosides, isoarvense glycosides, and other pigment compounds. Among them, anthocyanins give the plant a unique blue-purple pigment characteristic, and its extract has a natural purple hue, exhibiting good color development potential.

[0004] Currently, the common applications of blue-side calendula are its medicinal value, such as clearing heat and drying dampness, and killing insects. There are no reports on its application as a natural dye in textile dyeing. Summary of the Invention

[0005] The purpose of this invention is to provide a method for dyeing fabrics using blue calendula as a dye.

[0006] The following technical solutions are used to achieve the above objectives.

[0007] The first aspect of this invention provides a method for dyeing fabrics, comprising the following steps:

[0008] Step 1: Add blue calendula flowers to water at 20℃~30℃ and stir well. After soaking, filter to obtain blue calendula flower pigment extract.

[0009] Step 2: Dilute the blue calendula pigment extract with water to obtain a dye solution;

[0010] Step 3: Place the pretreated fabric to be dyed into the dye solution and dye it at 20℃~30℃.

[0011] In some implementations, step 1 includes at least one of the following conditions:

[0012] The temperature of the water is 20℃~26℃, preferably 23℃~25℃;

[0013] The soaking time is 30-50 minutes;

[0014] The mass ratio of blue calendula to water is 1:40~60, preferably 1:40~55, and more preferably 1:48~52.

[0015] In some implementations, step 3 includes at least one of the following conditions:

[0016] The dyeing temperature is 20℃~26℃, preferably 23℃~25℃;

[0017] The mass ratio of the fabric to be dyed to the dye liquor is 1:50~80, preferably 1:50~70, and more preferably 1:58~62;

[0018] The staining time is 30 min to 50 min, preferably 35 min to 48 min, and more preferably 38 min to 42 min.

[0019] In some implementations, step 2 includes at least one of the following conditions:

[0020] The mass ratio of the blue calendula pigment extract to water is 1:100~800, preferably 1:100~300.

[0021] The temperature of the water is 20℃~30℃, preferably 20℃~25℃.

[0022] In some implementations, after step 3 is completed, the following steps are also included:

[0023] The dyed fabric is immersed in a mordant solution containing mordant for mordant treatment.

[0024] In some embodiments, the mordant is ferrous sulfate or potassium aluminum sulfate;

[0025] And / or, the concentration of the mordant in the mordant solution is 0.1 g / L-2 g / L;

[0026] And / or, the mass ratio of the dyed fabric to the mordant solution is 1:50~80;

[0027] And / or, the mordant treatment is performed at a temperature of 20°C to 30°C for a time of 15 min to 50 min.

[0028] In some embodiments, the mordant is ferrous sulfate, and the concentration of ferrous sulfate in the mordant solution is 0.2 g / L to 0.8 g / L;

[0029] Alternatively, the mordant is potassium aluminum sulfate, and the concentration of potassium aluminum sulfate in the mordant solution is 0.5 g / L to 2 g / L.

[0030] In some embodiments, step 3, the preprocessing is as follows:

[0031] The fabric to be dyed is subjected to desizing and fiber modification treatment in sequence;

[0032] Preferably, the desizing process includes the following steps:

[0033] Add the fabric to be dyed to water, then add sodium carbonate to a final concentration of 2g / L~3g / L and BCN to a final concentration of 0.3g / L~0.8g / L, and soak at 85℃~95℃ for 25min~35min;

[0034] The fiber modification treatment includes the following steps:

[0035] Add the desized fabric to water, then add sodium hydroxide or sodium carbonate with a final concentration of 1g / L~2g / L or 2g / L~3g / L, and add fiber modifier at 3%~8% of the weight of the fabric. Soak at 75℃~85℃ for 15min~25min, then rinse, dehydrate, and dry.

[0036] In some embodiments, after step 3 is completed, a post-treatment step of the dyed fabric is also included:

[0037] The dyed fabric is then washed, dehydrated, and dried in sequence.

[0038] Preferably, the washing process includes immersing the dyed fabric in water at 20°C to 35°C for 5 to 20 minutes at a bath ratio of 1:40 to 80.

[0039] And / or, the drying includes oven drying or natural air drying; preferably, the drying temperature is 50℃~60℃ and the time is 10min~20min;

[0040] And / or, the fabric is a natural fiber; preferably, the natural fiber is selected from at least one of cotton fiber, linen fiber, silk fiber, and wool fiber; more preferably, the fabric is cotton fiber, silk fiber, or wool fiber.

[0041] A second aspect of the present invention provides a fabric dyed by the dyeing method described above.

[0042] The inventors of this invention have discovered that the pigment extract from *Calendula macrantha* obtained by extracting pigment from *Calendula macrantha* at a specific extraction temperature can be used as an excellent plant dye for fabric dyeing. Using this pigment extract as a dye and dyeing fabrics at specific temperatures, purple-toned fabrics can be obtained, exhibiting excellent color development and color fastness. This invention enriches the plant dyeing color system and provides a new approach for the valuable utilization of characteristic plant resources in high-altitude and cold regions.

[0043] Furthermore, after the fabric is dyed with dye containing blue calendula pigment extract, it is then mordanted with ferrous sulfate, potassium aluminum sulfate and other mordants, which not only enriches the fabric color but also further improves the color fastness of the fabric.

[0044] In addition, drying the fabric at a specific temperature after dyeing can achieve the same effect as natural air drying, thus not affecting the color and improving drying efficiency. Attached Figure Description

[0045] Figure 1 This is a dyeing effect diagram of the dyed fabric of Embodiment 1 of the present invention.

[0046] Figure 2 This is a dyeing effect diagram of the dyed fabric of Embodiment 2 of the present invention.

[0047] Figure 3 This is a dyeing effect diagram of the dyed fabric of Embodiment 3 of the present invention.

[0048] Figure 4 This is a dyeing effect diagram of the dyed fabric of Embodiment 4 of the present invention.

[0049] Figure 5 This is a dyeing effect diagram of the dyed fabric of Embodiment 5 of the present invention.

[0050] Figure 6 This is a dyeing effect diagram of the dyed fabric of Embodiment 6 of the present invention.

[0051] Figure 7 This is a dyeing effect diagram of the dyed fabric of Embodiment 7 of the present invention.

[0052] Figure 8 This is a dyeing effect diagram of the dyed fabric of Embodiment 8 of the present invention.

[0053] Figure 9 This is a dyeing effect diagram of the dyed fabric of Embodiment 9 of the present invention.

[0054] Figure 10This is a dyeing effect diagram of the dyed fabric of Embodiment 10 of the present invention.

[0055] Figure 11 This is a dyeing effect diagram of the dyed fabric of Embodiment 11 of the present invention.

[0056] Figure 12 This is a dyeing effect diagram of the dyed fabric of Embodiment 12 of the present invention.

[0057] Figure 13 This is a dyeing effect diagram of the dyed fabric of Comparative Example 1 of the present invention.

[0058] Figure 14 This is a dyeing effect diagram of the dyed fabric of Comparative Example 2 of the present invention.

[0059] Figure 15 This is a dyeing effect diagram of the dyed fabric of Comparative Example 3 of the present invention.

[0060] Figure 16 This is a dyeing effect diagram of the dyed fabric of Comparative Example 4 of the present invention.

[0061] Figure 17 This is a dyeing effect diagram of the dyed fabric of Comparative Example 5 of the present invention.

[0062] Figure 18 This is a dyeing effect diagram of the dyed fabric of Comparative Example 6 of the present invention.

[0063] Figure 19 This is a dyeing effect diagram of the dyed fabric of Comparative Example 7 of the present invention.

[0064] Figure 20 This is a dyeing effect diagram of the dyed fabric of Comparative Example 8 of the present invention.

[0065] Figure 21 This is a dyeing effect diagram of the dyed fabric of Comparative Example 9 of the present invention.

[0066] Figure 22 This is a dyeing effect diagram of the dyed fabric of Comparative Example 10 of the present invention.

[0067] Figure 23 This is a dyeing effect diagram of the dyed fabric of Comparative Example 11 of the present invention.

[0068] Figure 24 This is a dyeing effect diagram of the dyed fabric of Comparative Example 12 of the present invention.

[0069] Figure 25 This is a dyeing effect diagram of the dyed fabric of Comparative Example 13 of the present invention.

[0070] Figure 26 This is a dyeing effect diagram of the dyed fabric of Comparative Example 14 of the present invention. Detailed Implementation

[0071] To facilitate understanding of the present invention, a more complete description will be provided below. The present invention can be implemented in many different forms and is not limited to the embodiments described herein. Rather, these embodiments are provided to provide a thorough and complete understanding of the disclosure of the present invention.

[0072] Unless otherwise specified, experimental methods in the following examples are generally performed under standard conditions or as recommended by the manufacturer. All commonly used chemical reagents used in the examples are commercially available products.

[0073] Unless otherwise defined, all technical and scientific terms used in this invention have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains. The terminology used in this specification is for the purpose of describing particular embodiments only and is not intended to limit the invention. The term "and / or" as used in this invention includes any and all combinations of one or more of the associated listed items.

[0074] The present invention will be further described below with reference to the embodiments.

[0075] Example 1

[0076] The fabric dyeing method provided in this embodiment includes the following steps:

[0077] Step 1: Fabric Preparation

[0078] Prepare 1 meter of cotton fiber fabric;

[0079] Step 2: Fabric Pretreatment

[0080] (1) Desizing treatment: Weigh the fabric, add the fabric to be dyed to water, the mass ratio of the fabric to water is 1:50, add 2.5g / L sodium carbonate and 0.5g / L BCN, and treat the fabric to be dyed at 90℃ for 30min.

[0081] (2) Modification treatment: Add the desized fabric to water, the mass ratio of the fabric to water is 1:50, add 1.5g / L sodium hydroxide, and add modifier FIXRESIN CTX at 3% of the weight of the fabric to be dyed. Modify the fabric to be dyed at 80℃ for 20min. After modification, rinse with water, dehydrate and dry for later use.

[0082] Step 3: Preparation of blue calendula pigment extract and dye solution

[0083] Measure out blue calendula flowers, add them to room temperature water at 25°C, and the mass ratio of blue calendula flowers to room temperature water is 1:50. Stir well, soak for 40 minutes, and then filter to obtain blue calendula flower pigment extract.

[0084] According to the desired color depth of the fabric to be dyed, measure 30% of the weight of the blue calendula pigment extract of the fabric. According to the mass ratio of the fabric to the dye solution of 1:60, measure an appropriate amount of water, add the pigment extract to the water at a temperature of 25℃, stir evenly, and the dye solution is obtained.

[0085] Step 4: Fabric dyeing

[0086] The fabric is placed in the dye bath with a mass ratio of fabric to dye bath of 1:60. The dyeing temperature is 25℃ and the time is 40min.

[0087] Step 5: Fabric Post-treatment

[0088] The fabric is taken out, washed, dehydrated, and dried to obtain the dyed fabric.

[0089] The washing conditions are: a fabric-to-water ratio of 1:50, a temperature of 30℃, and a washing time of 10 minutes. After normal dehydration, the fabric is dried under the following conditions: a temperature of 55℃, and a drying time between 10 and 20 minutes depending on the thickness of the fabric.

[0090] The obtained fabric dyeing results are shown in the figure below. Figure 1 As shown, a purple-toned dyed fabric was obtained. The fabric surface has a uniform color, no dyeing defects, deep color, high dyeing rate, and excellent dyeing effect.

[0091] Example 2

[0092] The fabric dyeing method provided in this embodiment includes the following steps:

[0093] Step 1: Fabric Preparation

[0094] Prepare 1 meter of cotton fiber fabric;

[0095] Step 2: Fabric Pretreatment

[0096] (1) Desizing treatment: The steps are the same as in Example 1;

[0097] (2) Modification treatment: The steps are the same as in Example 1;

[0098] Step 3: Prepare the blue calendula pigment extract, dye solution, and mordant solution.

[0099] Measure out blue calendula flowers, add them to room temperature water at 25°C, and the mass ratio of blue calendula flowers to room temperature water is 1:50. Stir well, soak for 40 minutes, and then filter to obtain blue calendula flower pigment extract.

[0100] According to the desired color depth of the fabric to be dyed, measure 30% of the weight of the blue calendula pigment extract of the fabric. According to the mass ratio of the fabric to the dye solution of 1:60, measure an appropriate amount of water, add the pigment extract to the water at a temperature of 25℃, stir evenly, and the dye solution is obtained.

[0101] According to the desired color depth of the fabric to be dyed, measure 0.5 g / L of ferrous sulfate, add it to water, and stir until the solid dissolves to obtain the mordant solution.

[0102] Step 4: Fabric dyeing

[0103] The fabric is placed in the dye bath with a mass ratio of 1:60 between the fabric to be dyed and the dye bath. The amount of blue calendula pigment extract is 30% of the weight of the fabric to be dyed. The dyeing temperature is 25°C and the time is 40 minutes.

[0104] Step 5: Mordant Treatment

[0105] The dyed fabric is placed in the mordant solution with a mass ratio of fabric to mordant solution of 1:60. The dyeing temperature is 25℃ and the time is 20min.

[0106] Step Six: Fabric Post-treatment

[0107] The fabric is taken out, washed, dehydrated, and dried to obtain the dyed fabric.

[0108] The washing conditions are: a fabric-to-water bath ratio of 1:50, a temperature of 30℃, and a time of 10 minutes. After normal dehydration, the fabric is dried under the following conditions: a temperature of 55℃, and a drying time between 10 and 20 minutes depending on the thickness of the fabric.

[0109] The obtained fabric dyeing results are shown in the figure below. Figure 2 As shown, a green-toned dyed fabric was obtained. The fabric surface has a uniform color, no dyeing defects, deep color, high dyeing rate, and excellent dyeing effect.

[0110] Example 3:

[0111] The fabric dyeing method provided in this embodiment includes the following steps:

[0112] Step 1: Fabric Preparation

[0113] Prepare 1 meter of cotton fiber fabric;

[0114] Step 2: Fabric Pretreatment

[0115] (1) Desizing treatment: The steps are the same as in Example 1;

[0116] (2) Modification treatment: The steps are the same as in Example 1;

[0117] Step 3: Prepare the blue calendula pigment extract, dye solution, and mordant solution.

[0118] Measure out blue calendula flowers, add them to room temperature water at 25°C, and the mass ratio of blue calendula flowers to room temperature water is 1:50. Stir well, soak for 40 minutes, and then filter to obtain blue calendula flower pigment extract.

[0119] According to the desired color depth of the fabric to be dyed, measure 30% of the weight of the blue calendula pigment extract of the fabric. According to the mass ratio of the fabric to the dye solution of 1:60, measure an appropriate amount of water, add the pigment extract to the water at a temperature of 25℃, stir evenly, and the dye solution is obtained.

[0120] According to the desired color depth of the fabric to be dyed, measure out 1.5 g / L of potassium aluminum sulfate, add it to water, and stir until the solid dissolves to obtain the mordant solution.

[0121] Step 4: Fabric dyeing

[0122] The fabric is placed in the dye bath with a mass ratio of 1:60 between the fabric to be dyed and the dye bath. The amount of blue calendula pigment extract is 30% of the weight of the fabric to be dyed. The dyeing temperature is 25°C and the time is 40 minutes.

[0123] Step 5: Mordant Treatment

[0124] The dyed fabric is placed in the mordant solution with a mass ratio of fabric to mordant solution of 1:60. The dyeing temperature is 25℃ and the time is 20min.

[0125] Step Six: Fabric Post-treatment

[0126] The dyed fabric is then removed, washed, dehydrated, and dried.

[0127] The washing conditions are: a fabric-to-water bath ratio of 1:50, a temperature of 30℃, and a time of 10 minutes. After normal dehydration, the fabric is dried under the following conditions: a temperature of 55℃, and a drying time between 10 and 20 minutes depending on the thickness of the fabric.

[0128] The obtained fabric dyeing results are shown in the figure below. Figure 3 As shown, a yellow-toned dyed fabric was obtained. The fabric surface has a uniform color, no dyeing defects, deep color, high dyeing rate, and excellent dyeing effect.

[0129] Example 4

[0130] The fabric dyeing method provided in this embodiment includes the following steps:

[0131] Step 1: Fabric Preparation

[0132] Prepare 1 meter of linen fabric;

[0133] Step 2: Fabric Pretreatment

[0134] (1) Desizing treatment: The steps are the same as in Example 1;

[0135] (2) Modification treatment: The steps are the same as in Example 1;

[0136] Step 3: Preparation of blue calendula pigment extract and dye solution

[0137] Measure out blue calendula flowers, add them to room temperature water at 26°C, and the mass ratio of blue calendula flowers to room temperature water is 1:55. Stir well, soak for 45 minutes, and then filter to obtain blue calendula flower pigment extract.

[0138] According to the desired color depth of the fabric to be dyed, measure 35% of the weight of the blue calendula pigment extract of the fabric. According to the mass ratio of the fabric to the dye solution of 1:55, measure an appropriate amount of water, add the pigment extract to the water at a water temperature of 26℃, stir evenly, and the dye solution is obtained.

[0139] Step 4: Fabric dyeing

[0140] The fabric is placed in the dye bath with a mass ratio of 1:55 between the fabric to be dyed and the dye bath. The amount of blue calendula pigment extract is 35% of the weight of the fabric to be dyed. The dyeing temperature is 26°C and the time is 45 minutes.

[0141] Step 5: Fabric Post-treatment

[0142] The fabric is taken out, washed, dehydrated, and dried to obtain the dyed fabric.

[0143] The washing conditions are: a fabric-to-water bath ratio of 1:55, a temperature of 30℃, and a time of 11 minutes. After normal dehydration, the fabric is dried under the following conditions: a temperature of 55℃, and a drying time between 10 and 20 minutes depending on the thickness of the fabric.

[0144] The obtained fabric dyeing results are shown in the figure below. Figure 4 As shown, a purple-toned dyed fabric was obtained. The fabric surface has a uniform color, no dyeing defects, moderate dyeing depth, and good color yield.

[0145] Example 5

[0146] The fabric dyeing method provided in this embodiment includes the following steps:

[0147] Step 1: Fabric Preparation

[0148] Prepare 1 meter of linen fabric;

[0149] Step 2: Fabric Pretreatment

[0150] (1) Desizing treatment: The steps are the same as in Example 1;

[0151] (2) Modification treatment: The steps are the same as in Example 1;

[0152] Step 3: Prepare the blue calendula pigment extract, dye solution, and mordant solution.

[0153] Measure out blue calendula flowers, add them to room temperature water at 26°C, and the mass ratio of blue calendula flowers to room temperature water is 1:55. Stir well, soak for 45 minutes, and then filter to obtain blue calendula flower pigment extract.

[0154] According to the desired color depth of the fabric to be dyed, measure 35% of the weight of the blue calendula pigment extract of the fabric. According to the mass ratio of the fabric to the dye solution of 1:55, measure an appropriate amount of water, add the pigment extract to the water at a water temperature of 26℃, stir evenly, and the dye solution is obtained.

[0155] According to the desired color depth of the fabric to be dyed, measure ferrous sulfate with a working concentration of 0.7 g / L, add it to water, and stir until the solid dissolves to obtain the mordant solution.

[0156] Step 4: Fabric dyeing

[0157] The fabric is placed in the dye bath with a mass ratio of 1:55 between the fabric to be dyed and the dye bath. The amount of blue calendula pigment extract is 35% of the weight of the fabric to be dyed. The dyeing temperature is 26°C and the time is 45 minutes.

[0158] Step 5: Mordant Treatment

[0159] The dyed fabric is placed in the mordant solution with a mass ratio of fabric to mordant solution of 1:55. The dyeing temperature is 26℃ and the time is 22min.

[0160] Step Six: Fabric Post-treatment

[0161] The fabric is taken out, washed, dehydrated, and dried to obtain the dyed fabric.

[0162] The washing conditions are: a fabric-to-water bath ratio of 1:55, a temperature of 30℃, and a time of 11 minutes. After normal dehydration, the fabric is dried under the following conditions: a temperature of 55℃, and a drying time between 10 and 20 minutes depending on the thickness of the fabric.

[0163] The obtained fabric dyeing results are shown in the figure below. Figure 5 As shown, a green-dyed fabric was obtained. The fabric surface had a uniform color, no dyeing defects, moderate dyeing depth, and good color yield.

[0164] Example 6

[0165] The fabric dyeing method provided in this embodiment includes the following steps:

[0166] Step 1: Fabric Preparation

[0167] Prepare 1 meter of linen fabric;

[0168] Step 2: Fabric Pretreatment

[0169] (1) Desizing treatment: The steps are the same as in Example 1;

[0170] (2) Modification treatment: The steps are the same as in Example 1;

[0171] Step 3: Prepare the blue calendula pigment extract, dye solution, and mordant solution.

[0172] Measure out blue calendula flowers, add them to room temperature water at 26°C, and the mass ratio of blue calendula flowers to room temperature water is 1:55. Stir well, soak for 45 minutes, and then filter to obtain blue calendula flower pigment extract.

[0173] According to the desired color depth of the fabric to be dyed, measure 35% of the weight of the blue calendula pigment extract of the fabric. According to the mass ratio of the fabric to the dye solution of 1:55, measure an appropriate amount of water, add the pigment extract to the water at a water temperature of 26℃, stir evenly, and the dye solution is obtained.

[0174] According to the desired color depth of the fabric to be dyed, measure out 1.8 g / L of potassium aluminum sulfate, add it to water, and stir until the solid dissolves to obtain the mordant solution.

[0175] Step 4: Fabric dyeing

[0176] The fabric is placed in the dye bath with a mass ratio of 1:55 between the fabric to be dyed and the dye bath. The amount of blue calendula pigment extract is 35% of the weight of the fabric to be dyed. The dyeing temperature is 26°C and the time is 45 minutes.

[0177] Step 5: Mordant Treatment

[0178] The dyed fabric is placed in the mordant solution with a mass ratio of fabric to mordant solution of 1:55. The dyeing temperature is 26℃ and the time is 22min.

[0179] Step Six: Fabric Post-treatment

[0180] The fabric is taken out, washed, dehydrated, and dried to obtain the dyed fabric.

[0181] The washing conditions are: a fabric-to-water bath ratio of 1:55, a temperature of 30℃, and a time of 11 minutes. After normal dehydration, the fabric is dried under the following conditions: a temperature of 55℃, and a drying time between 10 and 20 minutes depending on the thickness of the fabric.

[0182] The obtained fabric dyeing results are shown in the figure below. Figure 6 As shown, a yellow-toned dyed fabric was obtained. The fabric surface had a uniform color, no dyeing defects, moderate dyeing depth, and good color yield.

[0183] Example 7

[0184] The fabric dyeing method provided in this embodiment includes the following steps:

[0185] Step 1: Fabric Preparation

[0186] Prepare 1 meter of fiber fabric;

[0187] Step 2: Fabric Pretreatment

[0188] (1) Desizing treatment: The steps are the same as in Example 1;

[0189] (2) Modification treatment: The steps are the same as in Example 1;

[0190] Step 3: Preparation of blue calendula pigment extract and dye solution

[0191] Measure out blue calendula flowers, add them to room temperature water at 23°C, and the mass ratio of blue calendula flowers to room temperature water is 1:45. Stir well, soak for 35 minutes, and then filter to obtain blue calendula flower pigment extract.

[0192] According to the desired color depth of the fabric to be dyed, measure 25% of the weight of the blue calendula pigment extract of the fabric. According to the mass ratio of the fabric to the dye solution of 1:70, measure an appropriate amount of water, add the pigment extract to the water at a temperature of 23°C, stir evenly, and the dye solution is obtained.

[0193] Step 4: Fabric dyeing

[0194] The fabric is placed in the dye bath with a mass ratio of 1:70 between the fabric to be dyed and the dye bath. The amount of blue calendula pigment extract is 25% of the weight of the fabric to be dyed. The dyeing temperature is 23°C and the time is 35 minutes.

[0195] Step 5: Fabric Post-treatment

[0196] The fabric is taken out, washed, dehydrated, and dried to obtain the dyed fabric.

[0197] The washing conditions are: a fabric-to-water ratio of 1:45, a temperature of 28℃, and a washing time of 8 minutes. After normal dehydration, the fabric is dried under the following conditions: a temperature of 55℃, and a drying time between 10 and 20 minutes depending on the thickness of the fabric.

[0198] The obtained fabric dyeing results are shown in the figure below. Figure 7As shown, a purple-dyed fabric was obtained. The fabric surface had a uniform color, no dyeing defects, deep color, high dyeing rate, and excellent dyeing effect.

[0199] Example 8

[0200] The fabric dyeing method provided in this embodiment includes the following steps:

[0201] Step 1: Fabric Preparation

[0202] Prepare 1 meter of fiber fabric;

[0203] Step 2: Fabric Pretreatment

[0204] (1) Desizing treatment: The steps are the same as in Example 1;

[0205] (2) Modification treatment: The steps are the same as in Example 1;

[0206] Step 3: Prepare the blue calendula pigment extract, dye solution, and mordant solution.

[0207] Measure out blue calendula flowers, add them to room temperature water at 23°C, and the mass ratio of blue calendula flowers to room temperature water is 1:45. Stir well, soak for 35 minutes, and then filter to obtain blue calendula flower pigment extract.

[0208] According to the desired color depth of the fabric to be dyed, measure 25% of the weight of the blue calendula pigment extract of the fabric. According to the mass ratio of the fabric to the dye solution of 1:70, measure an appropriate amount of water, add the pigment extract to the water at a temperature of 23°C, stir evenly, and the dye solution is obtained.

[0209] According to the desired color depth of the fabric to be dyed, measure 0.3 g / L of ferrous sulfate, add it to water, and stir until the solid dissolves to obtain the mordant solution.

[0210] Step 4: Fabric dyeing

[0211] The fabric is placed in the dye bath with a mass ratio of 1:70 between the fabric to be dyed and the dye bath. The amount of blue calendula pigment extract is 25% of the weight of the fabric to be dyed. The dyeing temperature is 23°C and the time is 35 minutes.

[0212] Step 5: Mordant Treatment

[0213] The dyed fabric is placed in the mordant solution with a mass ratio of fabric to mordant solution of 1:70. The dyeing temperature is 23℃ and the time is 15min.

[0214] Step Six: Fabric Post-treatment

[0215] The fabric is taken out, washed, dehydrated, and dried to obtain the dyed fabric.

[0216] The washing conditions are: a fabric-to-water ratio of 1:45, a temperature of 28℃, and a washing time of 8 minutes. After normal dehydration, the fabric is dried under the following conditions: a temperature of 55℃, and a drying time between 10 and 20 minutes depending on the thickness of the fabric.

[0217] The obtained fabric dyeing results are shown in the figure below. Figure 8 As shown, a green-dyed fabric was obtained, with uniform color on the fabric surface, no dyeing defects, deep color, high dyeing rate, and excellent dyeing effect.

[0218] Example 9

[0219] The fabric dyeing method provided in this embodiment includes the following steps:

[0220] Step 1: Fabric Preparation

[0221] Prepare 1 meter of fiber fabric;

[0222] Step 2: Fabric Pretreatment

[0223] (1) Desizing treatment: The steps are the same as in Example 1;

[0224] (2) Modification treatment: The steps are the same as in Example 1;

[0225] Step 3: Prepare the blue calendula pigment extract, dye solution, and mordant solution.

[0226] Measure out blue calendula flowers, add them to room temperature water at 23°C, and the mass ratio of blue calendula flowers to room temperature water is 1:45. Stir well, soak for 35 minutes, and then filter to obtain blue calendula flower pigment extract.

[0227] According to the desired color depth of the fabric to be dyed, measure 25% of the weight of the blue calendula pigment extract of the fabric. According to the mass ratio of the fabric to the dye solution of 1:70, measure an appropriate amount of water, add the pigment extract to the water at a temperature of 23°C, stir evenly, and the dye solution is obtained.

[0228] According to the desired color depth of the fabric to be dyed, measure out 1 g / L of potassium aluminum sulfate, add it to water, and stir until the solid dissolves to obtain the mordant solution.

[0229] Step 4: Fabric dyeing

[0230] The fabric is placed in the dye bath with a mass ratio of 1:70 between the fabric to be dyed and the dye bath. The amount of blue calendula pigment extract is 25% of the weight of the fabric to be dyed. The dyeing temperature is 23°C and the time is 35 minutes.

[0231] Step 5: Mordant Treatment

[0232] The dyed fabric is placed in the mordant solution with a mass ratio of fabric to mordant solution of 1:70. The dyeing temperature is 23℃ and the time is 15min.

[0233] Step Six: Fabric Post-treatment

[0234] The fabric is taken out, washed, dehydrated, and dried to obtain the dyed fabric.

[0235] The washing conditions are: a fabric-to-water ratio of 1:45, a temperature of 28℃, and a washing time of 8 minutes. After normal dehydration, the fabric is dried under the following conditions: a temperature of 55℃, and a drying time between 10 and 20 minutes depending on the thickness of the fabric.

[0236] The obtained fabric dyeing results are shown in the figure below. Figure 9 As shown, a yellow-toned dyed fabric was obtained. The fabric surface had a uniform color, no dyeing defects, deep color, high dyeing rate, and excellent dyeing effect.

[0237] Example 10

[0238] The fabric dyeing method provided in this embodiment includes the following steps:

[0239] Step 1: Fabric Preparation

[0240] Prepare 1 meter of wool fiber fabric;

[0241] Step 2: Fabric Pretreatment

[0242] (1) Desizing treatment: The steps are the same as in Example 1;

[0243] (2) Modification treatment: The steps are the same as in Example 1;

[0244] Step 3: Preparation of blue calendula pigment extract and dye solution

[0245] Measure out blue calendula flowers, add them to room temperature water at 20°C, and the mass ratio of blue calendula flowers to room temperature water is 1:42. Stir well, soak for 48 minutes, and then filter to obtain blue calendula flower pigment extract.

[0246] According to the desired color depth of the fabric to be dyed, measure 22% of the weight of the blue calendula pigment extract of the fabric. According to the mass ratio of the fabric to the dye solution of 1:52, measure an appropriate amount of water, add the pigment extract to the water at a temperature of 20℃, stir evenly, and the dye solution is obtained.

[0247] Step 4: Fabric dyeing

[0248] The fabric is placed in the dye bath with a mass ratio of fabric to dye bath of 1:52. The blue calendula pigment extract is 22% of the weight of the fabric to be dyed. The dyeing temperature is 20℃ and the time is 48min.

[0249] Step 5: Fabric Post-treatment

[0250] The fabric is taken out, washed, dehydrated, and dried to obtain the dyed fabric.

[0251] The washing conditions are: a fabric-to-water bath ratio of 1:56, a temperature of 25℃, and a time of 12 minutes. After normal dehydration, the fabric is dried under the following conditions: a temperature of 55℃, and a drying time between 10 and 20 minutes depending on the thickness of the fabric.

[0252] The obtained fabric dyeing results are shown in the figure below. Figure 10 As shown, a purple-dyed fabric was obtained. The fabric surface had a uniform color, no dyeing defects, deep color, high dyeing rate, and excellent dyeing effect.

[0253] Example 11

[0254] The fabric dyeing method provided in this embodiment includes the following steps:

[0255] Step 1: Fabric Preparation

[0256] Prepare 1 meter of wool fiber fabric;

[0257] Step 2: Fabric Pretreatment

[0258] (1) Desizing treatment: The steps are the same as in Example 1;

[0259] (2) Modification treatment: The steps are the same as in Example 1;

[0260] Step 3: Prepare the blue calendula pigment extract, dye solution, and mordant solution.

[0261] Measure out blue calendula flowers, add them to room temperature water at 20°C, and the mass ratio of blue calendula flowers to room temperature water is 1:42. Stir well, soak for 48 minutes, and then filter to obtain blue calendula flower pigment extract.

[0262] According to the desired color depth of the fabric to be dyed, measure 22% of the weight of the blue calendula pigment extract of the fabric. According to the mass ratio of the fabric to the dye solution of 1:52, measure an appropriate amount of water, add the pigment extract to the water at a temperature of 20℃, stir evenly, and the dye solution is obtained.

[0263] According to the desired color depth of the fabric to be dyed, measure ferrous sulfate with a working concentration of 0.35 g / L, add it to water, and stir until the solid dissolves to obtain the mordant solution;

[0264] Step 4: Fabric dyeing

[0265] The fabric is placed in the dye bath with a mass ratio of fabric to dye bath of 1:52. The blue calendula pigment extract is 22% of the weight of the fabric to be dyed. The dyeing temperature is 20℃ and the time is 48min.

[0266] Step 5: Mordant Treatment

[0267] The dyed fabric is placed in the mordant solution with a mass ratio of fabric to mordant solution of 1:52. The dyeing temperature is 20℃ and the time is 18min.

[0268] Step Six: Fabric Post-treatment

[0269] The fabric is taken out, washed, dehydrated, and dried to obtain the dyed fabric.

[0270] The washing conditions are: a fabric-to-water bath ratio of 1:56, a temperature of 25℃, and a time of 12 minutes. After normal dehydration, the fabric is dried under the following conditions: a temperature of 55℃, and a drying time between 10 and 20 minutes depending on the thickness of the fabric.

[0271] The obtained fabric dyeing results are shown in the figure below. Figure 11 As shown, the green-dyed fabric has a uniform color on the surface, no dyeing defects, deep color, high dyeing rate, and excellent dyeing effect.

[0272] Example 12

[0273] The fabric dyeing method provided in this embodiment includes the following steps:

[0274] Step 1: Fabric Preparation

[0275] Prepare 1 meter of wool fiber fabric;

[0276] Step 2: Fabric Pretreatment

[0277] (1) Desizing treatment: The steps are the same as in Example 1;

[0278] (2) Modification treatment: The steps are the same as in Example 1;

[0279] Step 3: Prepare the blue calendula pigment extract, dye solution, and mordant solution.

[0280] Measure out blue calendula flowers, add them to room temperature water at 20°C, and the mass ratio of blue calendula flowers to room temperature water is 1:42. Stir well, soak for 48 minutes, and then filter to obtain blue calendula flower pigment extract.

[0281] According to the desired color depth of the fabric to be dyed, measure 22% of the weight of the blue calendula pigment extract of the fabric. According to the mass ratio of the fabric to the dye solution of 1:52, measure an appropriate amount of water, add the pigment extract to the water at a temperature of 20℃, stir evenly, and the dye solution is obtained.

[0282] According to the desired color depth of the fabric to be dyed, measure out 0.8 g / L of potassium aluminum sulfate, add it to water, and stir until the solid dissolves to obtain the mordant solution.

[0283] Step 4: Fabric dyeing

[0284] The fabric is placed in the dye bath with a mass ratio of fabric to dye bath of 1:52. The blue calendula pigment extract is 22% of the weight of the fabric to be dyed. The dyeing temperature is 20℃ and the time is 48min.

[0285] Step 5: Mordant Treatment

[0286] The dyed fabric is placed in the mordant solution with a mass ratio of fabric to mordant solution of 1:52. The dyeing temperature is 20℃ and the time is 18min.

[0287] Step Six: Fabric Post-treatment

[0288] The fabric is taken out, washed, dehydrated, and dried to obtain the dyed fabric.

[0289] The washing conditions are: a fabric-to-water bath ratio of 1:56, a temperature of 25℃, and a time of 12 minutes. After normal dehydration, the fabric is dried under the following conditions: a temperature of 55℃, and a drying time between 10 and 20 minutes depending on the thickness of the fabric.

[0290] The obtained fabric dyeing results are shown in the figure below. Figure 12 As shown, a yellow-toned dyed fabric was obtained. The fabric surface had a uniform color, no dyeing defects, deep color, high dyeing rate, and excellent dyeing effect.

[0291] Comparative Example 1

[0292] The fabric dyeing method provided in this comparative example, compared with Example 1, involves raising the temperature of the water used to extract the blue calendula to 100°C in step three (preparing the dye solution) and raising the dyeing temperature to 60°C in step four (fabric dyeing). The rest is the same as in Example 1.

[0293] The obtained fabric dyeing results are shown in the figure below. Figure 13 As shown, the fabric retains its original color with no significant change. The dyeing depth is shallow, resulting in poor dyeing effect.

[0294] Comparative Example 2

[0295] The fabric dyeing method provided in this comparative example, compared with Example 2, involves raising the temperature of the water used to extract indigo marigolds to 100°C in step three (preparing the dye solution), raising the dyeing temperature to 60°C in step four (fabric dyeing), and raising the dyeing temperature to 45°C in step five (mordant treatment). The rest is the same as in Example 2.

[0296] The obtained fabric dyeing results are shown in the figure below. Figure 14 As shown, it appears to be the color of iron oxide, with a yellowish hue and a mottled dyeing effect. The dyeing depth is shallow, and the dyeing effect is poor.

[0297] Comparative Example 3

[0298] The fabric dyeing method provided in this comparative example, compared with Example 3, involves raising the temperature of the water used to extract indigo marigolds to 100°C in step three (preparing the dye solution), raising the dyeing temperature to 60°C in step four (fabric dyeing), and raising the dyeing temperature to 45°C in step five (mordant treatment). The rest is the same as in Example 3.

[0299] The obtained fabric dyeing results are shown in the figure below. Figure 15 As shown, the fabric retains its original color with no obvious changes, the dyeing depth is shallow, and the dyeing effect is poor.

[0300] Comparative Example 4

[0301] The fabric dyeing method provided in this comparative example is the same as that in Example 1, the drying process is replaced by air drying in the fabric post-treatment step.

[0302] The obtained fabric dyeing results are shown in the figure below. Figure 16 As shown, similar to the drying effect, a purple-dyed fabric was obtained. The fabric surface had a uniform color, no dyeing defects, deep color, high dyeing rate, and excellent dyeing effect.

[0303] Comparative Example 5

[0304] The fabric dyeing method provided in this comparative example is the same as that in Example 2, except that drying is replaced by air drying in the fabric post-treatment step.

[0305] The obtained fabric dyeing results are shown in the figure below. Figure 17 As shown, similar to the drying effect, a green dyed fabric was obtained. The fabric surface has a uniform color, no dyeing defects, deep dyeing, high dyeing rate, and excellent dyeing effect.

[0306] Comparative Example 6

[0307] The fabric dyeing method provided in this comparative example is the same as that in Example 3, the drying process is replaced by air drying in the fabric post-treatment step.

[0308] The obtained fabric dyeing results are shown in the figure below. Figure 18 As shown, similar to the drying effect, a yellow dyed fabric was obtained. The fabric surface has a uniform color, no dyeing defects, deep color, high dyeing rate, and excellent dyeing effect.

[0309] Comparative Example 7

[0310] The fabric dyeing method provided in this comparative example, compared with Example 1, involves raising the temperature of the water from which the blue calendula flower is extracted to 100°C in step three of the dye bath preparation process; otherwise, it is the same as in Example 1.

[0311] The obtained fabric dyeing results are shown in the figure below. Figure 19 As shown, the fabric retains its original color with no obvious changes, the dyeing depth is shallow, and the dyeing effect is poor.

[0312] Comparative Example 8

[0313] The fabric dyeing method provided in this comparative example, compared with Example 1, involves raising the temperature of the water from which the blue calendula flower is extracted to 60°C in step three of the dye bath preparation process; otherwise, it is the same as in Example 1.

[0314] The obtained fabric dyeing results are shown in the figure below. Figure 20 As shown, the fabric retains its original color with a slightly yellowish hue and no obvious changes. The dyeing depth is shallow, and the dyeing effect is poor.

[0315] Comparative Example 9

[0316] The fabric dyeing method provided in this comparative example, compared with Example 1, involves raising the temperature of the water from which the blue calendula flower is extracted to 40°C in step three of the dye bath preparation process; otherwise, it is the same as in Example 1.

[0317] The obtained fabric dyeing results are shown in the figure below. Figure 21 As shown, it is light grayish-purple, the fabric dyeing effect is dirty, the dyeing depth is moderate, and the amount of color obtained is average.

[0318] Comparative Example 10

[0319] The fabric dyeing method provided in this comparative example, compared with Example 1, involves lowering the temperature of the water used to extract the blue calendula to 15°C in step three of the dye bath preparation process; otherwise, it remains the same as Example 1.

[0320] The obtained fabric dyeing results are shown in the figure below. Figure 22 As shown, it is dark purple, the fabric dyeing effect is dirty and uneven, the dyeing depth is moderate, and the amount of color obtained is average.

[0321] Comparative Example 11

[0322] The fabric dyeing method provided in this comparative example, compared with Example 1, increases the dyeing temperature to 100°C in step four of the fabric dyeing process, while the rest is the same as in Example 1.

[0323] The obtained fabric dyeing results are shown in the figure below. Figure 23 As shown, the fabric retains its original color with no obvious changes, the dyeing depth is shallow, and the dyeing effect is poor.

[0324] Comparative Example 12

[0325] The fabric dyeing method provided in this comparative example, compared with Example 1, increases the dyeing temperature to 60°C in step four of fabric dyeing, while the rest is the same as in Example 1.

[0326] The obtained fabric dyeing results are shown in the figure below. Figure 24 As shown, the fabric retains its original color with a slightly yellowish hue and no obvious changes. The dyeing depth is shallow, and the dyeing effect is poor.

[0327] Comparative Example 13

[0328] The fabric dyeing method provided in this comparative example, compared with Example 1, increases the dyeing temperature to 40°C in step four of fabric dyeing, while the rest is the same as in Example 1.

[0329] The obtained fabric dyeing results are shown in the figure below. Figure 25 As shown, it is light grayish-purple, the fabric dyeing effect is dirty, the dyeing depth is moderate, and the amount of color obtained is average.

[0330] Comparative Example 14

[0331] The fabric dyeing method provided in this comparative example, compared with Example 1, reduces the dyeing temperature to 15°C in step four of the fabric dyeing process, while the rest is the same as in Example 1.

[0332] The obtained fabric dyeing results are shown in the figure below. Figure 26 As shown, the color is dark purple, the fabric dyeing effect appears dirty, the dyeing depth is moderate, and the color yield is average. Furthermore, this temperature is difficult for the machine to achieve for mass production, making mass production not highly feasible.

[0333] The color development, wash fastness, and light fastness of the dyed fabrics obtained by the dyeing methods provided in the examples and comparative examples were tested.

[0334] Color fastness to soap washing: Tested according to Q / JX 3-2016 "Plant-dyed woven garments";

[0335] Light fastness: Tested according to Q / JX 3-2016 "Plant-dyed woven garments";

[0336] The results are shown in Table 1.

[0337] Table 1 Performance Comparison

[0338]

[0339]

[0340]

[0341]

[0342] As shown in Table 1 and the corresponding figures, Example 1, by extracting the pigment from *Calendula purpurea* using room-temperature water and dyeing the fabric at room temperature, successfully obtained a purple-toned fabric with good color development and uniform color on the fabric surface, free of dyeing defects. In contrast, Comparative Example 1, which used high-temperature water to extract the pigment from *Calendula purpurea* and dyed the fabric at high temperature, only yielded the original fabric color with poor color development. Examples 2-3, building upon Example 1, further enriched the colors by mordating the fabric with the *Calendula purpurea* dye, creating green, yellow, and other color schemes, and further improving the colorfastness of the fabric. However, Comparative Examples 2-3, even with mordating after dyeing, only exhibited iron mordant dyeing or the original fabric color, with poor color development.

[0343] As can be seen from the comparison between Examples 1-3 and Comparative Examples 4-6, drying the fabric at a specific temperature after dyeing can achieve an effect that is basically the same as the color deepening effect of natural drying, thus achieving the effect of not affecting the color and improving the drying efficiency.

[0344] As can be seen from Examples 1-12, the blue-side marigold can be applied to the dyeing of cotton, linen, silk, and wool fabrics, and its color development is better than that of linen fabrics in cotton, silk, and wool fabrics.

[0345] As shown in Examples 1 and Comparative Examples 7-10, excessively high or low extraction temperatures of the blue calendula pigment extract can lead to poor staining results, even under suitable staining conditions. Furthermore, as shown in Examples 1 and Comparative Examples 11-14, even when the extraction temperature of the blue calendula pigment extract is suitable, excessively high or low staining temperatures can also result in poor staining results. Therefore, extraction and staining temperatures work synergistically; both must be within a suitable temperature range to achieve the desired staining effect.

[0346] Therefore, by employing a specific extraction method on *Calendula purpurea*, specifically by adding *Calendula purpurea* to room temperature water, stirring evenly, and then soaking and filtering to obtain a *Calendula purpurea* pigment extract, this extract can be used as a plant dye for fabric dyeing to produce purple-toned fabrics. It achieves excellent color development and color fastness on the fabric, thereby expanding the range of purple-toned dyeing plants, enriching the plant dyeing color system, and providing a new avenue for the valuable utilization of characteristic plant resources in high-altitude and cold regions. Furthermore, after the fabric is dyed with this *Calendula purpurea* dye, mordant treatment with ferrous sulfate, potassium aluminum sulfate, and other mordants can further enrich the color and improve the color fastness of the fabric. In addition, after the fabric is dyed, drying it at a specific temperature can achieve an effect essentially the same as natural air drying, achieving the effect of not affecting the color while improving drying efficiency.

[0347] The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above 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.

[0348] The embodiments described above are merely illustrative of several implementations of the present invention, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the invention patent. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of the present invention, and these all fall within the protection scope of the present invention. Therefore, the protection scope of this invention patent should be determined by the appended claims.

Claims

1. A method for dyeing a fabric, characterized in that, Includes the following steps: Step 1: Add blue calendula flowers to water at 20℃~30℃ and stir well. After soaking, filter to obtain blue calendula flower pigment extract. Step 2: Dilute the blue calendula pigment extract with water to obtain a dye solution; Step 3: Place the pretreated fabric to be dyed into the dye solution and dye it at 20℃~30℃.

2. The dyeing method for fabric as described in claim 1, characterized in that, Step 1 includes at least one of the following conditions: The temperature of the water is 20℃~26℃, preferably 23℃~25℃; The soaking time is 30-50 minutes; The mass ratio of blue calendula to water is 1:40~60, preferably 1:40~55, and more preferably 1:48~52.

3. The dyeing method for fabric as described in claim 1, characterized in that, Step 3 includes at least one of the following conditions: The dyeing temperature is 20℃~26℃, preferably 23℃~25℃; The mass ratio of the fabric to be dyed to the dye liquor is 1:50~80, preferably 1:50~70, and more preferably 1:58~62; The staining time is 30 min to 50 min, preferably 35 min to 48 min, and more preferably 38 min to 42 min.

4. The dyeing method for fabric as described in claim 1, characterized in that, Step 2 includes at least one of the following conditions: The mass ratio of the blue calendula pigment extract to water is 1:100~800, preferably 1:100~300. The temperature of the water is 20℃~30℃, preferably 20℃~25℃.

5. The dyeing method for fabrics according to any one of claims 1-4, characterized in that, After step 3 is completed, the following steps are also included: The dyed fabric is immersed in a mordant solution containing mordant for mordant treatment.

6. The fabric dyeing method as described in claim 5, characterized in that, The mordant is ferrous sulfate or potassium aluminum sulfate; And / or, the concentration of the mordant in the mordant solution is 0.1 g / L-2 g / L; And / or, the mass ratio of the dyed fabric to the mordant solution is 1:50~80; And / or, the mordant treatment is performed at a temperature of 20°C to 30°C for a time of 15 min to 50 min.

7. The dyeing method for fabric as described in claim 6, characterized in that, The mordant is ferrous sulfate, and the concentration of ferrous sulfate in the mordant solution is 0.2 g / L to 0.8 g / L; Alternatively, the mordant is potassium aluminum sulfate, and the concentration of potassium aluminum sulfate in the mordant solution is 0.5 g / L to 2 g / L.

8. The dyeing method for fabrics according to any one of claims 1-4, characterized in that, In step 3, the preprocessing is as follows: The fabric to be dyed is subjected to desizing and fiber modification treatment in sequence; Preferably, the desizing process includes the following steps: Add the fabric to be dyed to water, then add sodium carbonate to a final concentration of 2g / L~3g / L and BCN to a final concentration of 0.3g / L~0.8g / L, and soak at 85℃~95℃ for 25min~35min; The fiber modification treatment includes the following steps: Add the desized fabric to water, then add sodium hydroxide or sodium carbonate with a final concentration of 1g / L~2g / L or 2g / L~3g / L, and add fiber modifier at 3%~8% of the weight of the fabric. Soak at 75℃~85℃ for 15min~25min, then rinse, dehydrate, and dry.

9. The dyeing method for fabrics according to any one of claims 1-4, characterized in that, After step 3 is completed, the process also includes a post-treatment step for the dyed fabric: The dyed fabric is then washed, dehydrated, and dried in sequence. Preferably, the washing process includes immersing the dyed fabric in water at 20°C to 35°C for 5 to 20 minutes at a bath ratio of 1:40 to 80. And / or, the drying includes oven drying or natural air drying; preferably, the drying temperature is 50℃~60℃ and the time is 10min~20min; And / or, the fabric is a natural fiber; preferably, the natural fiber is selected from at least one of cotton fiber, linen fiber, silk fiber, and wool fiber; more preferably, the fabric is cotton fiber, silk fiber, or wool fiber.

10. Fabric obtained by dyeing according to any one of claims 1-9.

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