Dyeing fabric and preparation method thereof

Abstract

The invention provides a dyed fabric and a preparation method thereof. The preparation method comprises the following steps: carrying out spray feeding treatment on a to-be-dyed fabric by adopting a slurry treatment solution, and carrying out drying and baking to obtain a pretreated fabric; dyeing the pretreated fabric by using a natural dye to obtain a dyed fabric; the dyed fabric is subjected to water washing, soaping and softening, and a dyed fabric finished product is obtained; wherein in terms of the total mass of the slurry treatment liquid being 100%, the slurry treatment liquid contains 1%-30% of a cationic modifier, 1%-10% of caustic soda and 60%-98% of thickening agent slurry; or, based on the total mass of the slurry treating fluid being 100%, the slurry treating fluid contains 0.1%-10% of the mordant and 90%-99.9% of the thickening agent slurry. According to the preparation method of the dyed fabric, the dosage and cost of chemical materials can be reduced, the color depth is improved, the problem of poor color fastness is solved, and the application value is achieved.

Description

Technical Field

[0001] The invention relates to a dyed fabric and a preparation method thereof, belonging to the technical field of textiles. Background Art

[0002] Natural dyes refer to dyes extracted from plants, animals or mineral resources. They are characterized by not being artificially synthesized and undergoing little or no chemical processing. These dyes are renewable and meet the requirements of sustainable development and environmental protection. In addition, many natural dyes are mostly derived from Chinese medicinal materials and have certain antibacterial functions. At the same time, fabrics dyed with natural dyes show a pure beauty of nature and are gradually loved by people.

[0003] However, conventional natural dye garment dyeing products are mainly dyed in garment dyeing machines. In order to ensure the uniformity of the dyeing effect, a bath ratio of about 1:30 is usually required. This practice will result in a large amount of chemical materials used and high production costs. In addition, the color depth of natural dye garment dyeing products is difficult to improve, and as the color depth increases, the color fastness will be significantly reduced, which will seriously affect the subsequent performance.

[0004] In view of this, it is extremely important to provide a method for preparing natural dye garment slurry for pretreating dyed fabrics to solve the above technical problems. Summary of the invention

[0005] To solve the above technical problems, the purpose of the present invention is to provide a dyed fabric and a preparation method thereof, so as to solve the problems of high cost, low color depth, poor color fastness, high production cost, etc. of traditional natural dye garment dyeing.

[0006] To achieve the above object, in a first aspect, the present invention provides a method for preparing a dyed fabric, which comprises the following steps:

[0007] Step 1: spraying the fabric to be dyed with a slurry treatment liquid, drying and baking to obtain a pretreated fabric;

[0008] Step 2: dyeing the pretreated fabric with natural dyes to obtain dyed fabric;

[0009] Step 3: washing, soaping and softening the dyed fabric to obtain a finished dyed fabric;

[0010] Wherein, based on the total mass of the slurry treatment liquid being 100%, the slurry treatment liquid contains: 1%-30% of a cationic modifier, 1%-10% of caustic soda, and 60%-98% of a thickener slurry;

[0011] Alternatively, based on the total mass of the slurry treatment liquid being 100%, the slurry treatment liquid contains: 0.1%-10% of mordant, 90%-99.9% of thickener slurry;

[0012] The thickener slurry is a mixture of a cellulose-based thickener and water, and the viscosity of the thickener slurry is 10-100 cP.

[0013] In the above preparation method, preferably, based on the total mass of the slurry treatment liquid being 100%, the slurry treatment liquid contains: 20%-30% of cationic modifier, 5%-10% of caustic soda, and 60%-75% of thickener slurry. If the cationic modifier is too high, the dyeing depth will not be improved, and the production cost will also be increased. When the slurry treatment liquid contains a cationic modifier, it also contains caustic soda and thickener slurry, and the total mass is 100%.

[0014] In the above preparation method, preferably, based on the total mass of the slurry treatment liquid being 100%, the slurry treatment liquid contains: 1%-10% mordant, and 90%-99% thickener slurry. If the amount of mordant added is too high, the dyeing depth will not be improved, and the production cost will also be increased. When there is no cationic modifier in the slurry treatment liquid, the mordant and thickener slurry can be used as the slurry treatment liquid, with a total mass of 100%.

[0015] In the above preparation method, preferably, the total mass percentage of each component in the slurry treatment liquid is 100%.

[0016] In the above preparation method, preferably, the cationic modifier comprises one or a combination of two or more of polyamine polymers, amide polymers, epoxy compounds, quaternary ammonium salt compounds, cationic propylene copolymers, natural cationic modifiers and polycationic compounds. The cationic treatment agents such as polyamine polymers, amide polymers, epoxy compounds, quaternary ammonium salt compounds, cationic propylene copolymers, natural cationic modifiers and polycationic compounds used in the present invention are all conventional substances and can be reasonably selected according to actual operation needs, and are not limited here.

[0017] In the above preparation method, preferably, the mordant includes one or a combination of two or more of ferrous sulfate, ferric sulfate, potassium aluminum sulfate (alum), and disodium ethylenediaminetetraacetate. More preferably, the mordant includes ferrous sulfate and / or potassium aluminum sulfate.

[0018] In the above preparation method, preferably, the cellulose-based thickener includes one or a combination of two or more of carboxymethyl starch (CMS), sodium carboxymethyl cellulose (CMC), hydroxypropyl methyl cellulose (HPMC), and hydroxyethyl cellulose (HEC); more preferably, the cellulose-based thickener includes one or a combination of two or more of carboxymethyl starch, sodium carboxymethyl cellulose, and hydroxypropyl methyl cellulose. The cellulose-based thickener of the present invention has water-holding properties, which can alleviate migration during the drying process and ensure uniformity. Controlling the viscosity of the thickener slurry will cause the slurry treatment liquid to act as a carrier, which can significantly reduce migration during the treatment process and subsequent drying process, and avoid the problem of dyeing due to migration. The present invention can achieve regulation of the viscosity of the thickener slurry by controlling the mass ratio of the cellulose-based thickener to water.

[0019] In the above preparation method, preferably, in step 1, the spray feeding process satisfies the following conditions:

[0020] Control the size of atomized droplets to 50-300 microns;

[0021] Flow rate is 0.03-0.08L / min;

[0022] The rotation speed is 45-60 revolutions / min;

[0023] If the atomized droplets of the spray feeding treatment are too large, it will lead to uneven slurry pretreatment, and uneven dark color block defects will appear after dyeing; if the atomized droplets of the spray feeding treatment are too small, the wetting treatment of the fabric will be slow, which will extend the processing time and greatly reduce the production efficiency. In addition, the bones of the clothes will be severely worn during the long rotation process, resulting in white mark defects;

[0024] If the flow rate of the spray feeding treatment is too large, the uniformity control of the fabric treatment will be unstable, and dark block color will appear; if the flow rate of the spray feeding treatment is too small, the fabric wetting treatment will be slow, which will extend the processing time and greatly reduce the production efficiency. In addition, the bones of the clothes will be severely worn during the long-term rotation, resulting in white mark defects.

[0025] If the rotation speed of the spray feeding treatment is too fast, it will cause serious wear of the bones of the clothes and white marks; if the rotation speed of the spray feeding treatment is too slow, the treatment time will be extended, which will reduce production efficiency.

[0026] In the above preparation method, preferably, in step one, the spray feeding treatment is carried out by a drum spraying device; more preferably, an E-SOFT machine can be used, and the E-SOFT machine has a nozzle on the door wall, and the slurry treatment liquid of the cationic modifier or mordant can be sprayed into its inner cavity in an atomized state. The inner cavity of the E-SOFT machine is a drum, which can rotate alternately clockwise and counterclockwise to drive the fabric to be dyed to move and contact evenly with the atomized slurry treatment liquid. In addition, the speed of atomization of the treatment liquid can also be adjusted by controlling the switch. The larger the switch, the faster the atomization speed. When the present invention uses the slurry treatment liquid to perform a spray feeding treatment on the fabric to be dyed, the slurry treatment liquid is in the form of a spray, uniformly contacts with the fabric to be dyed, and is evenly distributed on the surface, ensuring that the treatment effect of each part of the fabric to be dyed is consistent.

[0027] In the above preparation method, preferably, in step 1, when the fabric is a knitted fabric, its liquid carrying rate is 100%-160%, and when the fabric is a woven fabric, its liquid carrying rate is 50%-100%. If the liquid carrying rate is too low, the treatment effect of some parts is insufficient, and if the liquid carrying rate is too high, some parts may move unevenly during the drying process due to excessive liquid, which ultimately leads to uneven treatment effect.

[0028] In the above preparation method, preferably, in step 1, the baking temperature is 100-150° C.; optionally, the baking process can be carried out in a baking furnace.

[0029] In the above preparation method, preferably, in step 1, the baking time is 5-30 min, more preferably 8-20 min.

[0030] In the above preparation method, preferably, in step 1, the drying temperature is 40-80° C., and the drying time is 25-60 min. The drying of the present invention is a conventional operation in the art, for example, it can be dried in a drum oven.

[0031] In the above preparation method, preferably, in step 2, the amount of the natural dye is 1% owf-10% owf, more preferably 1% owf-7% owf. If the amount of the natural dye is too high, it may cause too much floating color that is not reacted and fixed after dyeing, resulting in reduced color fastness, affecting subsequent wearing performance, and also increasing production costs.

[0032] In the above preparation method, preferably, the temperature of the dyeing treatment is 50-100°C, more preferably 60-80°C.

[0033] In the above preparation method, preferably, the dyeing treatment time is 0.5-3h, more preferably 0.5-1.5h.

[0034] In the above preparation method, preferably, in step 2, the natural dye includes natural animal dye and / or plant dye.

[0035] In the above preparation method, preferably, the natural animal dye comprises one or a combination of two or more of shellac, cochineal carmine, and gallnut extract.

[0036] In the above preparation method, preferably, the plant dye includes one or a combination of two or more of madder extract, chlorophyll, green tea extract, and pomegranate peel extract. More preferably, the plant dye includes madder extract and / or pomegranate peel extract.

[0037] In the above preparation method, preferably, the fibers used in the fabric include natural fibers and / or chemical fibers.

[0038] In the above preparation method, preferably, the natural fiber includes one or a combination of two or more of cotton, linen, silk and wool.

[0039] In the above preparation method, preferably, the chemical fiber includes one or a combination of two or more of acrylic fiber, viscose, nylon and polyester.

[0040] In a second aspect, the present invention also provides a dyed fabric obtained by the above-mentioned method for preparing a dyed fabric.

[0041] In the above dyed fabric, preferably, the dyed fabric is ready-made clothing.

[0042] Compared with the prior art, the present invention has the following beneficial effects:

[0043] In the process of preparing the dyed fabric of the present invention, a cellulose-based thickener is added to the slurry treatment liquid. The cellulose-based thickener can connect the fibers and the yarns, promote the migration of the cationic modifier or the mordant between the fibers and the migration between the yarns. In addition, the cellulose-based thickener has a certain slow-release effect on the cationic modifier and the mordant, so that the slurry treatment liquid can react more fully with the fibers and the yarns.

[0044] The slurry treatment liquid is applied by spraying, which can greatly reduce the amount of chemical materials used. The direct application method can also improve the reaction efficiency and bonding rate of the treatment liquid and the fiber, and improve the color depth and color fastness;

[0045] The preparation method of the dyed fabric of the present invention can reduce the amount of chemical materials used, increase the color depth, improve the problem of poor color fastness, and has strong application value. BRIEF DESCRIPTION OF THE DRAWINGS

[0046] Figure 1 This is a rendering of the appearance of the finished dyed T-shirt obtained in Example 1.

[0047] Figure 2 This is a rendering of the appearance of the finished dyed T-shirt obtained in Example 6.

[0048] Figure 3 This is a rendering of the appearance of the finished dyed T-shirt obtained in Example 7.

[0049] Figure 4 This is a rendering of the appearance of the finished dyed T-shirt obtained in Comparative Example 1. DETAILED DESCRIPTION

[0050] In order to have a clearer understanding of the technical features, purposes and beneficial effects of the present invention, the technical solution of the present invention is now described in detail below, but it should not be construed as limiting the applicable scope of the present invention.

[0051] Example 1

[0052] This embodiment provides a method for preparing a finished product of a dyed all-cotton knitted plain T-shirt, wherein the preparation method comprises the following specific steps:

[0053] Step 1: Weigh a certain amount of carboxymethyl starch (CMS) and stir it in water to dissolve it, control the viscosity to 10 cP, and obtain a carboxymethyl starch slurry; and prepare an alum mordant slurry treatment liquid according to the dosage of 99% carboxymethyl starch slurry and 1% alum (potassium aluminum sulfate) mordant;

[0054] The 32S×2 cotton knitted plain T-shirt was pretreated with alum mordant slurry treatment liquid. The pretreatment was carried out using an E-SOFT machine. The size of the atomized droplets was 50 microns, the flow rate was 0.03L / min, the rotation speed of the drum was 45 turns / min, and the liquid carrying rate of the knitted fabric was controlled to be 100%. After reaching the target liquid carrying rate, the atomization spraying was stopped and the rotation was continued for 30 minutes.

[0055] Then put it into an oven for drying, the drying temperature is 80°C, and the treatment time is 25 minutes; then it is subjected to high temperature treatment in a baking furnace to make it fully react, wherein the baking temperature is 150°C, and the treatment time is 8 minutes, to obtain a pretreated T-shirt;

[0056] Step 2: dyeing the pretreated T-shirt obtained in step 1 with natural dyes in a vat, wherein the natural dye is madder extract, the dosage is 3% owf, the reaction temperature is 50° C., the treatment time is 3 h, and a dyed T-shirt is obtained;

[0057] Step 3: Wash, soften, shape and pre-shrink the dyed T-shirt obtained in step 2 to obtain a finished dyed T-shirt.

[0058] Figure 1This is a rendering of the appearance of a finished dyed T-shirt obtained in Example 1 of the present invention.

[0059] Example 2

[0060] This embodiment provides a method for preparing a finished product of a dyed all-cotton knitted 3×1 twill French terry fabric sweater, wherein the preparation method comprises the following specific steps:

[0061] Step 1: Weigh a certain amount of hydroxypropyl methylcellulose (HPMC) and stir it in water to dissolve it, control the viscosity to 50 cP, and obtain hydroxypropyl methylcellulose slurry; and prepare a ferrous sulfate mordant slurry treatment liquid according to the dosage of 90% hydroxypropyl methylcellulose slurry and 10% ferrous sulfate mordant;

[0062] The 3×1 twill French terry sweater was pretreated with ferrous sulfate mordant slurry treatment liquid. The pretreatment was carried out using an E-SOFT machine. The size of the atomized droplets was 300 microns, the flow rate was 0.08 L / min, the rotation speed of the drum was 60 turns / min, and the liquid carrying rate of the knitted fabric was controlled to be 160%. After reaching the target liquid carrying rate, the atomization spraying was stopped and the rotation was continued for 30 minutes.

[0063] Then put it into an oven for drying, the drying temperature is 40°C, and the treatment time is 60 minutes; then it is subjected to high temperature treatment in a baking furnace to make it fully react, wherein the baking temperature is 100°C, and the treatment time is 30 minutes, to obtain a pretreated sweater;

[0064] Step 2: dyeing the pretreated sweatshirt obtained in step 1 with natural dyes in a vat, wherein the natural dye is a gallnut extract, the dosage is 10% owf, the reaction temperature is 90° C., the treatment time is 0.5 h, and a dyed sweatshirt is obtained;

[0065] Step 3: washing, softening, shaping and pre-shrinking the dyed sweatshirt obtained in step 2 to obtain a finished dyed sweatshirt.

[0066] Example 3

[0067] This embodiment provides a method for preparing a finished dyed cotton woven shirt, wherein the method comprises the following specific steps:

[0068] Step 1: Weigh a certain amount of sodium carboxymethyl cellulose (CMC) and stir it in water to dissolve it, control the viscosity to 100 cP, and obtain sodium carboxymethyl cellulose slurry. According to the dosage of 60% sodium carboxymethyl cellulose slurry, 30% acrylamide alkyl quaternary ammonium salt, and 10% sodium hydroxide, a cationic modifier slurry treatment liquid is prepared;

[0069] The woven shirts were subjected to cationic pretreatment using a cationic treatment agent polyamine polymer slurry treatment liquid. The pretreatment was carried out using an E-SOFT machine. The size of the atomized droplets was 150 microns, the flow rate was 0.05 L / min, the rotation speed of the drum was 50 turns / min, and the liquid carrying rate of the woven fabric was controlled to be 100%. After reaching the target liquid carrying rate, the atomization spraying was stopped and the rotation operation continued for 10 minutes.

[0070] Then put it into an oven for drying, the drying temperature is 60°C, and the treatment time is 45 minutes; then it is subjected to high temperature treatment in a baking furnace to make it fully react, wherein the baking temperature is 140°C, and the treatment time is 15 minutes, to obtain a pretreated shirt;

[0071] Step 2: dyeing the pretreated shirt obtained in step 1 with a natural dye in a vat, wherein the natural dye is pomegranate peel extract, the dosage is 3% owf, the reaction temperature is 70° C., the treatment time is 1 h, and a dyed shirt is obtained;

[0072] Step 3: washing, softening, shaping and pre-shrinking the dyed shirt obtained in step 2 to obtain a finished dyed shirt.

[0073] Example 4

[0074] This embodiment provides a method for preparing a finished product of a dyed cotton and wool blended (80:20) knitted 3×1 twill French terry cloth sweater, wherein the preparation method comprises the following specific steps:

[0075] Step 1: Weigh a certain amount of sodium carboxymethyl cellulose and carboxymethyl starch (mass ratio is 8:2) and stir them in water to dissolve them, control the viscosity to 20 cP, and obtain a mixed slurry of sodium carboxymethyl cellulose and carboxymethyl starch. Prepare a cationic modified slurry treatment liquid according to 75% of the mixed slurry, 20% of acrylamide alkyl quaternary ammonium salt and chitosan mixture (mass ratio is 4:6), and 5% of sodium hydroxide;

[0076] The cationic modified slurry treatment liquid was used to pretreat a cotton-wool blended (80:20) knitted 3×1 twill French terry sweater. The pretreatment was performed using an E-SOFT machine. The size of the atomized droplets was 150 microns, the flow rate was 0.05 L / min, the rotation speed of the drum was 50 turns / min, and the liquid carrying rate of the knitted fabric was controlled to be 140%. After reaching the target liquid carrying rate, the atomization spraying was stopped and the rotation operation continued for 20 minutes.

[0077] Then put it into an oven for drying, the drying temperature is 80°C, and the treatment time is 25 minutes; then it is subjected to high temperature treatment in a baking furnace to make it fully react, wherein the baking temperature is 130°C, and the treatment time is 20 minutes, to obtain a pretreated sweater;

[0078] Step 2: dyeing the pretreated sweatshirt obtained in step 1 with a natural dye in a vat, wherein the natural dye is chlorophyll, the dosage is 2% owf, the reaction temperature is 60° C., the treatment time is 2 h, and a dyed sweatshirt is obtained;

[0079] Step 3: washing, softening, shaping and pre-shrinking the dyed sweatshirt obtained in step 2 to obtain a finished dyed sweatshirt.

[0080] Example 5

[0081] This embodiment provides a method for preparing a dyed cotton-polyester blended (80:20) knitted T-shirt, wherein the preparation method comprises the following specific steps:

[0082] Step 1: Weigh a certain amount of hydroxypropyl methylcellulose (HPMC) and hydroxyethyl cellulose (HEC) (mass ratio is 6:4) and stir them in water to dissolve them, control the viscosity to 80 cP, and obtain hydroxypropyl methylcellulose and hydroxyethyl cellulose slurry, and then prepare a mixed mordant slurry treatment liquid according to the dosage of 97% hydroxypropyl methylcellulose and hydroxyethyl cellulose slurry, a mixture of ferrous sulfate and alum (mass ratio is 1:1), and 3% mordant;

[0083] The knitted T-shirt was pre-treated with the mixed mordant slurry treatment liquid. The pre-treatment was carried out in an E-SOFT machine. The size of the atomized droplets was 150 microns, the flow rate was 0.05 L / min, the rotation speed of the drum was 50 turns / min, and the liquid carrying rate of the knitted fabric was controlled to be 120%. After reaching the target liquid carrying rate, the atomization spraying was stopped and the rotation operation was continued for 20 minutes.

[0084] Then put it into an oven for drying, the drying temperature is 40°C, and the treatment time is 60 minutes; then it is subjected to high temperature treatment in a baking furnace to make it fully react, wherein the baking temperature is 110°C, and the treatment time is 15 minutes, to obtain a pretreated T-shirt;

[0085] Step 2: dyeing the pretreated T-shirt obtained in step 1 with natural dyes in a vat, wherein the natural dye is green tea extract, the dosage is 4% owf, the reaction temperature is 70° C., the treatment time is 1.5 h, and a dyed T-shirt is obtained;

[0086] Step 3: Wash, soften, shape and pre-shrink the dyed T-shirt obtained in step 2 to obtain a finished dyed T-shirt.

[0087] Example 6

[0088] This embodiment provides a method for preparing a dyed knitted T-shirt, which differs from Embodiment 1 only in that:

[0089] In step 1, the viscosity of the thickener slurry was adjusted to 100 cP, and the remaining steps were the same.

[0090] Figure 2 This is a rendering of the appearance of a finished dyed T-shirt obtained in Example 6 of the present invention.

[0091] Example 7

[0092] This embodiment provides a method for preparing a dyed knitted T-shirt, which differs from Embodiment 3 only in that:

[0093] In step 1, the processing object is adjusted to a knitted T-shirt, and the remaining steps are the same.

[0094] Figure 3 This is a rendering of the appearance of a finished dyed T-shirt produced in Example 7 of the present invention.

[0095] Comparative Example 1

[0096] This comparative example provides a method for preparing a finished product of a dyed all-cotton knitted plain T-shirt, wherein the preparation method comprises the following specific steps:

[0097] Step 1: Pre-treat 32S×2 cotton knitted plain T-shirt to improve its adsorption performance and remove some impurities and oil stains, wherein the amount of sodium carbonate is 2g / L, the amount of penetrant JFC (fatty alcohol polyoxyethylene ether, non-ionic surfactant) is 1g / L, the bath ratio is 1:30, the temperature is 80℃, and the time is 20min;

[0098] Step 2: The pre-treated T-shirt is then cationized in a vat using an acrylamide alkyl quaternary ammonium salt cationic modifier to improve the fiber-to-fiber adsorption, wherein the amount of the cationic modifier is 15 g / L, the amount of sodium hydroxide is 5 g / L, the bath ratio is 1:30, the temperature is 70°C, and the time is 60 min;

[0099] Step 3: dyeing the T-shirt treated with pre-mordant in step 2 with natural dyes in a vat, wherein the natural dye is madder extract, the dosage is 3% owf, the dosage of alum mordant is 2 g / L, the dosage of HAC is 0.2 g / L, the bath ratio is 1:30, the reaction temperature is 70°C, the treatment time is 1 h, and a dyed T-shirt is obtained;

[0100] Step 4: washing, softening, shaping and pre-shrinking the dyed T-shirt obtained in step 3 to obtain a finished dyed T-shirt;

[0101] Figure 4 This is a rendering of the appearance of the finished dyed T-shirt obtained in Comparative Example 1.

[0102] Comparative Example 2

[0103] This comparative example provides a method for preparing a dyed T-shirt finished product, wherein the preparation method comprises the following specific steps:

[0104] Step 1: Pre-treat 32S×2 cotton plain T-shirt to improve its adsorption performance and remove some impurities and oil stains, wherein the amount of sodium carbonate is 2g / L, the amount of penetrant (fatty alcohol polyoxyethylene ether) is 1g / L, the bath ratio is 1:30, the temperature is 80℃, and the time is 20min;

[0105] Step 2: The pre-treated T-shirt is then cationized in a vat using a chitosan-based cationic modifier to improve the fiber-to-fiber adsorption, wherein the amount of the cationic modifier is 15 g / L, the amount of sodium hydroxide is 5 g / L, the bath ratio is 1:30, the temperature is 70°C, and the time is 60 min;

[0106] Step 3: dyeing the garment pretreated with the modifier slurry in step 2 with natural dyes in a vat, wherein the natural dye is pomegranate peel extract, the dosage is 3% owf, the reaction temperature is 70° C., the treatment time is 1 h, and a dyed T-shirt is obtained;

[0107] Step 4: The dyed T-shirt obtained in step 3 is washed, softened, shaped and pre-shrunk to obtain a finished dyed T-shirt.

[0108] Comparative Example 3

[0109] This comparative example provides a method for preparing a dyed T-shirt, which differs from Example 1 only in that:

[0110] In step 1, the content of potassium aluminum sulfate in the alum mordant slurry treatment liquid is 20%, the liquid carrying rate of the knitted fabric is controlled to be 80%, and the remaining steps are the same.

[0111] The color depth of the finished dyed T-shirt obtained in this comparative example is basically not improved compared with Example 1, and the color fastness is also reduced; because the liquid carrying rate does not meet the treatment of the entire garment, unevenly dyed light-colored blocks appear in some positions of the T-shirt (especially the bone position).

[0112] Comparative Example 4

[0113] This comparative example provides a method for preparing a dyed woven shirt, which differs from Example 3 only in that:

[0114] In step 1, the content of acrylamide alkyl ammonium salt in the cationic modifier slurry treatment liquid is 40%, the liquid carrying rate of the woven fabric is controlled to be 150%, and the remaining steps are the same.

[0115] The color depth of the finished dyed woven shirt obtained in this comparative example is basically not improved compared with Example 3, and the soap washing color fastness is slightly improved by 0.5 level; because the liquid carrying rate far exceeds the amount that the shirt fabric can bear, unevenly dyed dark blocks appear in some parts of the shirt (especially the bone position).

[0116] Comparative Example 5

[0117] This comparative example provides a method for preparing a dyed T-shirt, which differs from Example 1 only in that:

[0118] In step 1, the viscosity of the thickener slurry was adjusted to 200 cP, and the remaining steps were the same.

[0119] The color depth of the finished dyed T-shirt obtained in this comparative example is basically not improved compared with that in Implementation Example 1; due to the high viscosity and poor fluidity of the treatment liquid, it is not able to evenly wet the entire garment, resulting in unevenly dyed light-colored blocks in some parts of the T-shirt (especially the bones).

[0120] Comparative Example 6

[0121] This comparative example provides a method for preparing a dyed T-shirt, which differs from Example 1 only in that:

[0122] In step one, the size of the atomized droplets is 400 microns.

[0123] Since the atomized droplets during the spray feeding process are too large, the slurry pretreatment is uneven, resulting in uneven dark color blocks after dyeing.

[0124] Comparative Example 7

[0125] This comparative example provides a method for preparing a dyed T-shirt, which differs from Example 1 only in that:

[0126] In step one, the size of the atomized droplets is 25 microns.

[0127] Because the atomized droplets during the spray feeding process are too small, the wetting process of the fabric is slow, which prolongs the processing time and leads to a significant reduction in production efficiency. In addition, the bones of the clothes will be severely worn during the long rotation process, resulting in white mark defects.

[0128] Comparative Example 8

[0129] This comparative example provides a method for preparing a dyed T-shirt, which differs from Example 1 only in that:

[0130] In step 1, the flow rate of the spray feeding treatment is 0.1 L / min.

[0131] Since the flow rate of the spray feeding process is too large, the control of the uniformity of fabric processing is unstable, and dark block-shaped color flowers will appear.

[0132] Comparative Example 9

[0133] This comparative example provides a method for preparing a dyed T-shirt, which differs from Example 1 only in that:

[0134] In step 1, the flow rate of the spray feeding treatment is 0.01 L / min.

[0135] Because the flow rate of the spray feeding treatment is too small, the wetting treatment of the fabric is slow, which prolongs the processing time and leads to a significant reduction in production efficiency. In addition, the bones of the clothes will be severely worn during the long rotation process, resulting in white mark defects.

[0136] Comparative Example 10

[0137] This comparative example provides a method for preparing a dyed T-shirt, which differs from Example 1 only in that:

[0138] In step 1, the rotation speed of the spray feeding treatment is 65 revolutions / min.

[0139] Since the rotation speed of the spray feeding process is too fast, the bones of the clothes are severely worn and white marks appear.

[0140] Comparative Example 11

[0141] This comparative example provides a method for preparing a dyed T-shirt, which differs from Example 1 only in that:

[0142] In step 1, the rotation speed of the spray feeding treatment is 40 revolutions / min.

[0143] Since the speed of the spray feeding process is too slow, the processing time is prolonged and the production efficiency is reduced.

[0144] Table 1 shows the color fastness data of the finished dyed fabrics of Examples 1-2 and Comparative Examples 1-2.

[0145] Table 1

[0146]

[0147]

[0148] It can be seen from the data in Table 1 that, compared with the dyed fabrics obtained by conventional dyeing in Comparative Examples 1-2, the color fastness of the garments dyed with natural dyes using the slurry treatment solution of the present invention is significantly improved by 0.5-1.5 levels, and the garments have better physical wearing properties.

[0149] Table 2 shows the KS data of the finished dyed fabrics of Examples 1-2 and Comparative Examples 1-2.

[0150] Table 2

[0151] KS Example 1 2.2713 Comparative Example 1 0.5845 Example 2 15.549 Comparative Example 2 6.0026

[0152] It can be seen from the data in Table 2 that, compared with the dyed fabrics obtained by conventional dyeing methods in Comparative Examples 1-2, the apparent depth of the garments dyed with natural dyes using the slurry treatment solution of the present invention is greatly improved. The improvement in the dyeing depth of most natural dyes is as shown in Example 2, which is 1.6 times (from 6.0026 to 15.549). The depth improvement of a small number of natural dyes can even reach 2.9 times (such as from 0.5845 to 2.2713 in Example 1), while ensuring better color fastness.

[0153] The preparation method of the dyed fabric provided by the present invention adopts a spray feeding method, which can significantly reduce the amount of chemical materials used. The specific production data are shown in Table 3.

[0154] Table 3

[0155]

[0156]

[0157] Note: Calculated based on 1 kg of fabric.

[0158] It can be seen from Table 3 that cationic modifiers can save 33% or more of production usage for most colors, and even 100% of production usage for a few colors; mordants can save about 83% of production usage, reducing production costs.

Claims

1. A method for preparing a dyed fabric, wherein: The following steps are involved: Step 1: spraying the fabric to be dyed with a slurry treatment liquid, drying and baking to obtain a pretreated fabric; Step 2: dyeing the pretreated fabric with natural dyes to obtain dyed fabric; Step 3: washing, soaping and softening the dyed fabric to obtain a finished dyed fabric; Wherein, based on the total mass of the slurry treatment liquid being 100%, the slurry treatment liquid contains: 1%-30% of a cationic modifier, 1%-10% of caustic soda, and 60%-98% of a thickener slurry; Alternatively, based on the total mass of the slurry treatment liquid being 100%, the slurry treatment liquid contains: 0.1%-10% of mordant, 90%-99.9% of thickener slurry; The thickener slurry is a mixture of a cellulose-based thickener and water, and the viscosity of the thickener slurry is 10-100 cP.

2. The preparation method according to claim 1, wherein The cationic modifier includes one or a combination of two or more of polyamine polymers, amide polymers, epoxy compounds, quaternary ammonium salt compounds, cationic propylene copolymers, natural cationic modifiers and polycationic compounds.

3. The preparation method according to claim 1 or 2, wherein The mordant includes one or a combination of two or more of ferrous sulfate, ferric sulfate, potassium aluminum sulfate, and disodium ethylenediaminetetraacetate.

4. The preparation method according to claim 1 or 2, wherein: The cellulose-based thickener includes one or a combination of two or more of carboxymethyl starch, sodium carboxymethyl cellulose, hydroxypropyl methyl cellulose, and hydroxyethyl cellulose.

5. The preparation method according to claim 1, wherein In step 1, the spray feeding treatment is carried out using a drum spraying device; Preferably, the spray feeding process satisfies the following conditions: The size of the atomized droplets is 50-300 microns; Flow rate is 0.03-0.08L / min; The rotation speed is 45-60 revolutions / min.

6. The preparation method according to claim 1 or 5, wherein: In step 1, when the fabric is a knitted fabric, its liquid carrying rate is 100%-160%, and when the fabric is a woven fabric, its liquid carrying rate is 50%-100%.

7. The preparation method according to claim 1, wherein In step 1, the baking temperature is 100-150° C. and the baking time is 5-30 minutes.

8. The preparation method according to claim 1, wherein In step 2, the natural dye is used in an amount of 1% owf to 10% owf; And / or, the temperature of the dyeing treatment is 50-100° C., and the time of the dyeing treatment is 0.5-3 h.

9. The preparation method according to claim 1 or 8, wherein: In step 2, the natural dyes include natural animal dyes and / or plant dyes; Preferably, the natural animal dye comprises one or a combination of two or more of shellac, cochineal carmine, and gallnut extract; Preferably, the plant dye comprises one or a combination of two or more of madder extract, chlorophyll, green tea extract, and pomegranate peel extract.

10. The preparation method according to claim 1, wherein: The fibers used in the fabric include natural fibers and / or chemical fibers; Preferably, the natural fiber includes one or a combination of two or more of cotton, linen, silk and wool; Preferably, the chemical fiber includes one or a combination of two or more of acrylic fiber, viscose fiber, nylon fiber and polyester fiber.

11. A dyed fabric obtained by the method for preparing a dyed fabric according to any one of claims 1 to 10; Preferably, the dyed fabric is a garment.

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