A water-saving dyeing process for fancy yarn

Abstract

The invention relates to the technical field of textile dyeing, and discloses a water-saving dyeing process for fancy yarn, comprising: step (1) dissolving a cationic modifier in a sodium hydroxide aqueous solution to obtain a mixed solution; step (2) immersing the fancy yarn in the mixed solution, stirring, washing, and drying to obtain a cationic modified fancy yarn; step (3) adding anionic dyes into water to obtain anionic dye solutions, and adding cationic fluorocarbon reagents into water to obtain cationic fluorocarbon solutions; step (4) sequentially filling the fancy yarn with anionic dye solutions, deionized water, and cationic fluorocarbon solutions, cyclically filling, to obtain deposited fancy yarns; and step (5) curing the deposited fancy yarns to obtain dyed fancy yarns. The dyeing process of the invention adopts an environmentally friendly and sustainable layer-by-layer deposition method to dye and functionally finish the fancy yarns, thereby minimizing the consumption of chemicals, water, and energy, and the obtained dyed yarns have high color fastness and good hydrophobic and oleophobic properties.

Description

Technical Field

[0001] The invention belongs to the technical field of textile dyeing, and in particular relates to a water-saving dyeing process for fancy yarns. Background Art

[0002] When we look at the textile industry from a sustainability perspective, water, chemical and energy consumption are undoubtedly the three main issues. The textile dyeing process consumes too much water, leaving a large amount of untreatable hazardous waste in the environment, such as salts, hydroxyl compounds and unreacted dyes. The most commonly used dyes in the yarn dyeing process are reactive dyes. A large amount of salt is required to increase the adsorption of dyes used for dyeing, and a large amount of water is required to clean and hydrolyze dyes, which has gradually failed to meet the national requirements for water conservation and consumption reduction in the textile industry.

[0003] Therefore, it is of great significance to develop new wet processing techniques that use less water, dyes and chemicals. Summary of the invention

[0004] The invention aims to provide a fancy yarn water-saving dyeing process, which is used to solve the technical problems of high water consumption, large amount of harmful waste and large amount of dye used in the prior art.

[0005] In order to achieve the above object, the present invention adopts the following technical solutions:

[0006] The present invention provides a fancy yarn water-saving dyeing process, comprising the following steps:

[0007] Step (1) dissolving a cationic modifier in a sodium hydroxide aqueous solution to obtain a mixed solution;

[0008] Step (2) immersing the fancy yarn in the mixed solution, stirring, washing, and drying to obtain the cationic modified fancy yarn;

[0009] In the above process, the fancy yarn surface is modified to have cationic sites.

[0010] Step (3) adding anionic dye into water to obtain anionic dye solution, and adding cationic fluorocarbon reagent into water to obtain cationic fluorocarbon solution;

[0011] Step (4) filling the fancy yarn with anionic dye solution, deionized water, and cationic fluorocarbon solution in sequence, cyclically filling, to obtain deposited fancy yarn;

[0012] Step (5) solidifies the deposited fancy yarn to obtain the dyed fancy yarn.

[0013] In the above process, the positively charged fancy yarn is alternately filled with anionic dye solution and cationic fluorocarbon solution through repeated filling and rinsing processes, gradually forming multiple layers of dye deposition, and depositing a dye / fluorocarbon film on the fancy yarn.

[0014] Preferably, the anionic dye is a reactive dye.

[0015] Preferably, the reactive dye comprises at least one of reactive red 24, reactive yellow 86 and reactive blue 19.

[0016] Preferably, the fancy yarn includes at least one of silk, cotton yarn, wool and nylon.

[0017] More preferably, the fancy yarn is cotton yarn.

[0018] Preferably, in step (1), the ratio of the cationic modifier to the sodium hydroxide aqueous solution is (50-80) g:(50-80) L; and the concentration of the sodium hydroxide aqueous solution is 10 g / L.

[0019] Preferably, in step (1), the method for preparing the cationic modifier comprises the following steps:

[0020] S1: In a nitrogen atmosphere, add 0.14-0.28L 4-vinylbenzyl chloride to 0.75-1.5L N,N-dimethylformamide, then add 0.8-1.6g initiator azobisisobutyronitrile, react at 75-85°C for 36-54h, then concentrate by rotary evaporator, add 1-2L methanol to precipitate the product, filter, wash the filter residue with methanol 3-5 times, and vacuum dry at 50-70°C for 12-24h to obtain an intermediate;

[0021] In the above process, 4-vinylbenzyl chloride monomer uses azobisisobutyronitrile as an initiator to synthesize a poly intermediate through free radical polymerization.

[0022] S2: Add 120-240g of the intermediate to 1.2-2.4L N,N-dimethylformamide, stir for 10-15min, add 55-110mL of triethylamine, react at room temperature for 60-84h, then concentrate by rotary evaporation, add 1-2L of acetone to precipitate the product, filter, wash the filter residue with acetone 3-5 times, and vacuum dry at 50-70°C for 12-24h to obtain a cationic modifier.

[0023] The structural formula of the cationic modifier is as follows:

[0024]

[0025] Preferably, in step (2), the bath ratio of the fancy yarn to the mixed liquid is 1:40; the stirring treatment conditions are: the stirring treatment temperature is 55-65°C, and the stirring treatment time is 2-4h; the washing method is: washing with deionized water at room temperature for 3-5 times; the drying conditions are: the drying temperature is 75-85°C, and the drying time is 12-24h.

[0026] Preferably, in step (3), the mass fraction of the anionic dye solution is 1-3 wt %; and the density of the cationic fluorocarbon solution is 45-55 g / L.

[0027] Preferably, in step (3), the method for preparing the cationic fluorocarbon reagent comprises the following steps:

[0028] 110-220g of isophorone diisocyanate is added to 0.5-1L of dichloromethane solvent, and then 5-10mL of catalyst dibutyltin laurate is added, and the mixture is heated to 35-45°C with stirring, and then 46-89g of 2-(dimethylamino)ethanol is added, and the reaction is continued for 0.5-1.5h, and then 182-364g of 1H,1H,2H,2H-perfluorooctanol is added dropwise, and the reaction is continued for 0.5-1.5h, and finally 71-142g of iodomethane is added dropwise, and the reaction is continued for 15-25min, and the residue is filtered, and the filter residue is washed with petroleum ether for 3-5 times, and dried at 75-85°C for 0.5-1.5h to obtain a cationic fluorocarbon reagent.

[0029] The structural formula of the cationic fluorocarbon reagent is as follows:

[0030]

[0031] Preferably, in step (4), the filling method is: layer-by-layer deposition using a laboratory-type filler; the number of cyclic filling times is 6-10 times.

[0032] Preferably, in step (5), the curing conditions are: curing temperature is 140-160°C, and curing time is 4-6 minutes.

[0033] In summary, due to the adoption of the above technical solution, the beneficial effects of the present invention are:

[0034] 1. The dyeing process of the present invention adopts an environmentally friendly and sustainable layer-by-layer deposition method to dye and functionally finish the fancy yarn, minimizing the consumption of chemicals, water and energy. The cationic modifier is electrostatically bonded and covalently bonded to the surface of the fancy yarn, so that the surface of the fancy yarn has cationic sites, while the reactive dye is negatively charged and the fluorocarbon solution is positively charged. The surface of the fancy yarn is based on the alternating deposition of anionic and cationic groups, and a nano-scale multilayer coating is formed on the surface of the charged material through electrostatic interaction, so that the coating of the fancy yarn is more dense, and the fancy yarn is dyed and functionally finished at the same time.

[0035] 2. The cationic modifier of the present invention modifies the fancy yarn in an aqueous environment. In addition to electrostatic bonding with the yarn surface, the chlorine atoms of the cationic modifier also provide the possibility of covalent bonding, which is environmentally friendly and improves the dyeing efficiency under eco-friendly conditions; the dyeing process is carried out at room temperature, and the fluorocarbon compound can be combined with the fancy yarn without the need for an acidic environment, thereby improving the breaking strength of the fancy yarn and extending the service life of the yarn; and except for the chemical groups used for dyeing and waterproof finishing, no additional chemicals are used, so the dye bath can be reused, producing less waste and textile materials with no loss of physical properties, and does not require multiple washing steps, does not require large amounts of water, chemicals and heating, and minimizes the consumption of water, auxiliaries and energy.

[0036] 3. The cationic fluorocarbon reagent of the present invention exhibits excellent surface activity, high thermal stability and chemical stability at low concentrations due to the high electronegativity and low polarity of the fluorine atom and the hydrophobic and oleophobic properties of the fluorocarbon chain, and has good wetting and spreading properties, so that the dyed yarn has good hydrophobicity and oleophobicity and washability; the carbamate bond in the polyurethane structure is a good degradation point, and the introduction of heteroatoms (such as O, N) into the fluorocarbon chain can promote the degradation of the fluorocarbon chain, avoid bioaccumulation, and be environmentally friendly. BRIEF DESCRIPTION OF THE DRAWINGS

[0037] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0038] Figure 1 It is a process flow chart of the fancy yarn water-saving dyeing process of the present invention;

[0039] Figure 2 It is a bar graph of the color fastness of the dyed yarn of the present invention. DETAILED DESCRIPTION

[0040] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0041] The substances and sources involved in the following examples and comparative examples are shown in Table 1:

[0042] Table 1

[0043]

[0044] In Example 1, this example discloses a method for preparing a cationic modifier, comprising the following steps:

[0045] S1: In a nitrogen atmosphere, 0.21 L of 4-vinylbenzyl chloride was added to 1.13 L of N,N-dimethylformamide, and then 1.2 g of initiator azobisisobutyronitrile was added, and the reaction was carried out at 80°C for 48 h. After concentration by a rotary evaporator, 1.5 L of methanol was added to precipitate the product, and the filter residue was washed with methanol 4 times, and then vacuum dried at 60°C for 18 h to obtain an intermediate;

[0046] S2: 180 g of the intermediate was added to 1.8 L N, N-dimethylformamide, stirred for 13 min, then 82.5 mL of triethylamine was added, and the reaction was carried out at room temperature for 72 h, and then concentrated by rotary evaporation, and then 1.5 L of acetone was added to precipitate the product, filtered, and the filter residue was washed with acetone 4 times, and vacuum dried at 60 ° C for 18 h to obtain a cationic modifier.

[0047] In Example 2, this example discloses a method for preparing a cationic fluorocarbon reagent, comprising the following steps:

[0048] 165 g of isophorone diisocyanate was added to 0.75 L of dichloromethane solvent, and then 7.5 mL of catalyst dibutyltin laurate was added, and the mixture was stirred and heated to 40 ° C. Then 69 g of 2-(dimethylamino)ethanol was added, and after reacting for 1 hour, 273 g of 1H, 1H, 2H, 2H-perfluorooctanol was added dropwise, and the reaction was continued for 1 hour. Finally, 106.5 g of iodomethane was added dropwise, and the reaction was continued for 20 minutes. The mixture was filtered, and the filter residue was washed 4 times with petroleum ether and dried at 80 ° C for 1 hour to obtain a cationic fluorocarbon reagent.

[0049] In Example 3, see Figure 1 As shown, this embodiment discloses a fancy yarn water-saving dyeing process, comprising the following steps:

[0050] Step (1) dissolving 65 g of the cationic modifier prepared in Example 1 in 65 L of a 10 g / L sodium hydroxide aqueous solution to obtain a mixed solution;

[0051] Step (2) immersing the fancy yarn in the mixed solution at a bath ratio of 1:40, stirring at 60° C. for 3 h, then washing with deionized water at room temperature for 4 times, and finally drying at 80° C. for 18 h to obtain the cationic modified fancy yarn;

[0052] Step (3) adding anionic dye into water to obtain a 2 wt % anionic dye solution, and adding the cationic fluorocarbon reagent prepared in Example 2 into water to obtain a 50 g / L cationic fluorocarbon solution;

[0053] Step (4) using a laboratory-type filler to sequentially fill the fancy yarn with anionic dye solution, deionized water, and cationic fluorocarbon solution, and cyclically fill for 8 times to obtain deposited fancy yarn;

[0054] Step (5) solidifies the deposited fancy yarn at 150°C for 5 minutes to obtain a dyed fancy yarn.

[0055] The anionic dye is Reactive Red 24.

[0056] The fancy yarn is cotton yarn.

[0057] In Example 4, see Figure 1 As shown, this embodiment discloses a fancy yarn water-saving dyeing process, comprising the following steps:

[0058] Step (1) dissolving 50 g of the cationic modifier prepared in Example 1 in 80 L of a 10 g / L sodium hydroxide aqueous solution to obtain a mixed solution;

[0059] Step (2) immersing the fancy yarn in the mixed solution at a bath ratio of 1:40, stirring at 55° C. for 4 hours, then washing with deionized water at room temperature for 3 times, and finally drying at 85° C. for 12 hours to obtain the cationic modified fancy yarn;

[0060] Step (3) adding anionic dye into water to obtain a 3 wt % anionic dye solution, and adding the cationic fluorocarbon reagent prepared in Example 2 into water to obtain a 45 g / L cationic fluorocarbon solution;

[0061] Step (4) using a laboratory-type filler to sequentially fill the fancy yarn with anionic dye solution, deionized water, and cationic fluorocarbon solution, and cyclically fill the fancy yarn 10 times to obtain a deposited fancy yarn;

[0062] Step (5) solidifies the deposited fancy yarn at 140°C for 6 minutes to obtain a dyed fancy yarn.

[0063] The anionic dye is Reactive Yellow 86.

[0064] The fancy yarn is cotton yarn.

[0065] In Example 5, see Figure 1 As shown, this embodiment discloses a fancy yarn water-saving dyeing process, comprising the following steps:

[0066] Step (1) dissolving 80 g of the cationic modifier prepared in Example 1 in 50 L of a 10 g / L sodium hydroxide aqueous solution to obtain a mixed solution;

[0067] Step (2) immersing the fancy yarn in the mixed solution at a bath ratio of 1:40, stirring at 65° C. for 2 h, then washing with deionized water at room temperature for 5 times, and finally drying at 75° C. for 24 h to obtain the cationic modified fancy yarn;

[0068] Step (3) adding anionic dye into water to obtain a 1 wt% anionic dye solution, and adding the cationic fluorocarbon reagent prepared in Example 2 into water to obtain a 55 g / L cationic fluorocarbon solution;

[0069] Step (4) using a laboratory-type filler to sequentially fill the fancy yarn with anionic dye solution, deionized water, and cationic fluorocarbon solution, and cyclically fill the fancy yarn 6 times to obtain a deposited fancy yarn;

[0070] Step (5) solidifies the deposited fancy yarn at 160°C for 4 minutes to obtain a dyed fancy yarn.

[0071] The anionic dye is reactive blue 19.

[0072] The fancy yarn is silk.

[0073] In Example 6, see Figure 1 As shown, this embodiment discloses a fancy yarn water-saving dyeing process, comprising the following steps:

[0074] Step (1) dissolving 55 g of the cationic modifier prepared in Example 1 in 75 L of a 10 g / L sodium hydroxide aqueous solution to obtain a mixed solution;

[0075] Step (2) immersing the fancy yarn in the mixed solution at a bath ratio of 1:40, stirring at 58° C. for 2 h, then washing with deionized water at room temperature for 4 times, and finally drying at 82° C. for 15 h to obtain the cationic modified fancy yarn;

[0076] Step (3) adding anionic dye into water to obtain a 2.5 wt% anionic dye solution, and adding the cationic fluorocarbon reagent prepared in Example 2 into water to obtain a 48 g / L cationic fluorocarbon solution;

[0077] Step (4) using a laboratory-type filler to sequentially fill the fancy yarn with anionic dye solution, deionized water, and cationic fluorocarbon solution, and cyclically fill for 7 times to obtain deposited fancy yarn;

[0078] Step (5) solidifies the deposited fancy yarn at 155°C for 4 minutes to obtain a dyed fancy yarn.

[0079] The anionic dye is Reactive Red 24.

[0080] The fancy yarn is wool.

[0081] In Example 7, see Figure 1 As shown, this embodiment discloses a fancy yarn water-saving dyeing process, comprising the following steps:

[0082] Step (1) dissolving 75 g of the cationic modifier prepared in Example 1 in 55 L of a 10 g / L sodium hydroxide aqueous solution to obtain a mixed solution;

[0083] Step (2) immersing the fancy yarn in the mixed solution at a bath ratio of 1:40, stirring at 62° C. for 3 h, then washing with deionized water at room temperature for 5 times, and finally drying at 78° C. for 22 h to obtain the cationic modified fancy yarn;

[0084] Step (3) adding anionic dye into water to obtain a 1.5 wt% anionic dye solution, and adding the cationic fluorocarbon reagent prepared in Example 2 into water to obtain a 52 g / L cationic fluorocarbon solution;

[0085] Step (4) using a laboratory-type filler to sequentially fill the fancy yarn with anionic dye solution, deionized water, and cationic fluorocarbon solution, and cyclically fill for 9 times to obtain deposited fancy yarn;

[0086] Step (5) solidifies the deposited fancy yarn at 145°C for 5 minutes to obtain a dyed fancy yarn.

[0087] The anionic dye is Reactive Yellow 86.

[0088] The fancy yarn is nylon.

[0089] Comparative Example 1

[0090] Compared with Example 3, in Comparative Example 1, in step (4), the dyeing is not performed by layer-by-layer deposition dyeing, but the dyeing is completed first and then the cationic fluorocarbon solution is used for finishing, while other conditions remain unchanged.

[0091] Comparative Example 2

[0092] Comparative Example 2 Compared with Example 3, no cationic modifier was used in Comparative Example 2, and other conditions remained unchanged.

[0093] Experimental example

[0094] The dyed yarns obtained by the water-saving dyeing process of Examples 3-7 and Comparative Examples 1-2 were subjected to performance tests:

[0095] 1. Hydrophobicity and oleophobicity test

[0096] The hydrophobicity was tested according to ISO4920 standard; the oleophobicity was tested according to AATCC118-2007 standard; the tensile strength was tested according to TES13934-1 standard at the breaking strength at break. The test results are shown in Table 2:

[0097] Table 2

[0098]

[0099] From the test results in Table 2, it can be seen that the dyed yarns obtained by the water-saving dyeing process in Examples 3-7 of the present invention have good hydrophobicity and oleophobicity. From the comparison between Comparative Example 1 and Example 3, it can be seen that the dyed yarns obtained by layer-by-layer deposition dyeing in the present invention have good hydrophobicity and oleophobicity; from the comparison between Comparative Example 2 and Example 3, it can be seen that the dyed yarns modified by the cationic modifier in the present invention have good hydrophobicity and oleophobicity.

[0100] 2. Color fastness test

[0101] The color fastness to water is tested according to GB / T5713-2013; the color fastness to rubbing is tested according to GB / T3920-2008; the color fastness to perspiration is tested according to GB / T3922-1995; the color fastness to soaping is tested according to GB / T3921-2008. The test results are shown in Table 3:

[0102] Table 3

[0103]

[0104] From the test results in Table 3, it can be seen that the dyed yarns obtained by the water-saving dyeing process in Examples 3-7 of the present invention have good color fastness. From the comparison between Comparative Example 1 and Example 3, it can be seen that the dyed yarns obtained by the layer-by-layer deposition dyeing of the present invention have good color fastness; from the comparison between Comparative Example 2 and Example 3, it can be seen that the dyed yarns modified by the cationic modifier of the present invention have good color fastness.

[0105] The above description is only a preferred specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can make equivalent replacements or changes according to the technical scheme and inventive concept of the present invention within the technical scope disclosed by the present invention, which should be covered by the protection scope of the present invention.

[0106] The preferred embodiments of the present invention disclosed above are only used to help explain the present invention. The preferred embodiments do not describe all the details in detail, nor do they limit the invention to only specific implementation methods. Obviously, many modifications and changes can be made according to the content of this specification. This specification selects and specifically describes these embodiments in order to better explain the principles and practical applications of the present invention, so that those skilled in the art can understand and use the present invention well. The present invention is limited only by the claims and their full scope and equivalents.

Claims

1. A fancy yarn water-saving dyeing process, characterized in that: The following steps are involved: Step (1) dissolving a cationic modifier in a sodium hydroxide aqueous solution to obtain a mixed solution; Step (2) immersing the fancy yarn in the mixed solution, stirring, washing, and drying to obtain the cationic modified fancy yarn; Step (3) adding anionic dye into water to obtain anionic dye solution, and adding cationic fluorocarbon reagent into water to obtain cationic fluorocarbon solution; Step (4) filling the cationic modified fancy yarn with anionic dye solution, deionized water, and cationic fluorocarbon solution in sequence, cyclically filling, to obtain deposited fancy yarn; Step (5) solidifying the deposited fancy yarn to obtain a dyed fancy yarn; The preparation method of the cationic modifier comprises the following steps: S1: In a nitrogen atmosphere, add 0.14-0.28L 4-vinylbenzyl chloride to 0.75-1.5L N,N-dimethylformamide, then add 0.8-1.6g initiator azobisisobutyronitrile, react at 75-85°C for 36-54h, then concentrate by rotary evaporator, add 1-2L methanol to precipitate the product, filter, wash the filter residue with methanol 3-5 times, and vacuum dry at 50-70°C for 12-24h to obtain an intermediate; S2: Add 120-240g of the intermediate to 1.2-2.4L N,N-dimethylformamide, stir for 10-15min, add 55-110mL of triethylamine, react at room temperature for 60-84h, then concentrate by rotary evaporation, add 1-2L of acetone to precipitate the product, filter, wash the filter residue with acetone 3-5 times, and vacuum dry at 50-70°C for 12-24h to obtain a cationic modifier.

2. The fancy yarn water-saving dyeing process according to claim 1, characterized in that: In the step (1), the usage ratio of the cationic modifier and the sodium hydroxide aqueous solution is (50-80) g:(50-80) L; and the concentration of the sodium hydroxide aqueous solution is 10 g / L.

3. The fancy yarn water-saving dyeing process according to claim 1, characterized in that: In the step (2), the bath ratio of the fancy yarn to the mixed solution is 1:40; the stirring treatment conditions are: the stirring treatment temperature is 55-65°C, and the stirring treatment time is 2-4h; the washing method is: washing with deionized water at room temperature for 3-5 times; the drying conditions are: the drying temperature is 75-85°C, and the drying time is 12-24h.

4. The fancy yarn water-saving dyeing process according to claim 1, characterized in that: In the step (3), the mass fraction of the anionic dye solution is 1-3wt%; and the density of the cationic fluorocarbon solution is 45-55g / L.

5. The fancy yarn water-saving dyeing process according to claim 1, characterized in that: In step (3), the method for preparing the cationic fluorocarbon reagent comprises the following steps: 110-220g of isophorone diisocyanate is added to 0.5-1L of dichloromethane solvent, and then 5-10mL of catalyst dibutyltin laurate is added, and the mixture is heated to 35-45°C with stirring, and then 46-89g of 2-(dimethylamino)ethanol is added, and the reaction is continued for 0.5-1.5h, and then 182-364g of 1H,1H,2H,2H-perfluorooctanol is added dropwise, and the reaction is continued for 0.5-1.5h, and finally 71-142g of iodomethane is added dropwise, and the reaction is continued for 15-25min, and the residue is filtered, and the filter residue is washed with petroleum ether for 3-5 times, and dried at 75-85°C for 0.5-1.5h to obtain a cationic fluorocarbon reagent.

6. The fancy yarn water-saving dyeing process according to claim 1, characterized in that: In the step (3), the anionic dye is a reactive dye; the reactive dye includes at least one of reactive red 24, reactive yellow 86, and reactive blue 19.

7. The fancy yarn water-saving dyeing process according to claim 1, characterized in that: The fancy yarn includes at least one of silk, cotton yarn, wool and nylon.

8. The fancy yarn water-saving dyeing process according to claim 1, characterized in that: In the step (4), the filling method is: layer-by-layer deposition using a laboratory filler; the number of cyclic filling times is 6-10 times.

9. The fancy yarn water-saving dyeing process according to claim 1, characterized in that: In the step (5), the curing conditions are: the curing temperature is 140-160°C and the curing time is 4-6 minutes.

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