A yarn solution dyeing process

Abstract

The present application relates to the technical field of textiles, and specifically discloses a yarn solution coloring process, which comprises the following steps: S1, preparing color paste: uniformly mixing dye, dispersant, erucic acid amide and N-methylpyrrolidone to obtain color paste; S2, preparing masterbatch: firstly mixing polyamide slices, color paste and functional additives to obtain premix; then feeding the premix into a twin-screw extruder, melt-extruding and granulating, and drying to obtain masterbatch; S3, preparing yarn: the masterbatch is subjected to spinning, cooling, oiling, drawing, heat setting and winding to obtain solution-dyed fiber; then the solution-dyed fiber is spun into yarn; the above-mentioned solution coloring process is simple to operate, so that the final nylon yarn is uniformly dyed, has high light fastness and good mechanical properties, expands the market application of nylon, and has the positive significance of energy saving, environmental protection and sustainable development.

Description

Technical Field

[0001] The present application relates to the technical field of textiles, and more specifically, to a yarn solution dyeing process. Background Art

[0002] Polyamide fiber, commonly known as nylon, is a type of synthetic fiber containing several amide repeating units in its molecular structure. Due to its excellent mechanical properties, chemical resistance, and heat resistance, it is widely used in textile, industry, medical and other fields. These excellent physical and mechanical properties of polyamide fibers depend on the highly three-dimensional regular macromolecular chain structure of polyamide, as well as the condensed structure with high crystallinity and orientation. However, these structural characteristics also bring the problem of polyamide fiber being difficult to dye. The solution dyeing of polyamide fibers enables polyamide fibers to be fundamentally colored at the "cell" stage, with the advantages of uniform coloring, good color fastness, and high dyeing rate; it also has the advantages of saving energy and less "three wastes"; and the subsequent application of solution-dyed polyamide fibers can save the printing and dyeing process and avoid the generation of a large amount of printing and dyeing wastewater, which has outstanding environmental friendly characteristics.

[0003] However, polyamide macromolecules are sensitive to light and heat, and have poor light and heat stability. Solution-dyed polyamide fibers tend to turn yellow and become brittle during use, and the dye degrades when exposed to light. After long-term use, the strength of the fiber decreases significantly. Therefore, it is urgent to propose a yarn solution-dyed process to solve the problems of poor light fastness and decreased mechanical properties of solution-dyed polyamide fibers, so that the obtained solution-dyed polyamide fibers have a high dye content, uniform dyeing, high light fastness, and good mechanical properties, thereby expanding the market application of nylon and having positive significance for energy conservation, environmental protection, and sustainable development. Summary of the invention

[0004] In order to solve the problems of poor light fastness and reduced mechanical properties of existing solution-dyed polyamide fibers, the present application provides a yarn solution-dying process.

[0005] The present application provides a yarn solution dyeing process, which adopts the following technical solution:

[0006] A yarn solution dyeing process comprises the following steps:

[0007] S1. Preparing color paste: uniformly mixing the dye, dispersant, erucic acid amide and N-methylpyrrolidone to obtain a color paste;

[0008] S2, preparing masterbatch: firstly, mixing polyamide slices, color paste and functional additives to obtain a premix; then feeding the premix into a twin-screw extruder, melt-extruding and granulating, and drying to obtain a masterbatch;

[0009] S3, preparing yarn: the masterbatch is spun, cooled, oiled, drawn, heat-set and wound to obtain solution-dyed fiber; then the solution-dyed fiber is spun into yarn;

[0010] The functional additive comprises the following raw materials in parts by weight: 30-40 parts of nano titanium dioxide, 20-30 parts of cinnamic acid, 10-30 parts of acetone, 10-20 parts of kaolin, 11-15 parts of superfine hemp stalk core powder, and 6-8 parts of PEG-1000.

[0011] By adopting the above technical scheme, the present application adopts the original pulp coloring method to prepare yarn, which is mainly divided into three steps. First, the color paste is prepared, and the color paste is composed of dye, dispersant, erucamide, and N-methylpyrrolidone; then the masterbatch is prepared, and the polyamide slices, color paste, and functional additives are mixed to obtain a premix, which is melt-extruded and granulated to obtain the masterbatch; finally, the masterbatch is used to spin the solution-dyed fiber, and the fiber is spun into yarn; the yarn original pulp coloring process of the present application enables the yarn to be fundamentally colored at the "cell" stage, and has the advantages of uniform coloring, good color fastness, and high dyeing rate, while greatly reducing resource energy consumption and environmental pollution.

[0012] In addition, the present application also adds functional additives during the preparation of masterbatches. The functional additives can solve the problems of poor light and heat stability of nylon yarns and easy fading of dyed fibers, significantly improve the light fastness of nylon yarns, and at the same time enhance the mechanical properties of nylon yarns.

[0013] Preferably, the mass ratio of the polyamide slice, color paste and functional additive is (100-120):(30-40):(14-18).

[0014] By adopting the above technical scheme, the present application controls the mass ratio of polyamide chips, color paste and functional additives within a certain range. On the one hand, the polyamide chips, color paste and functional additives are closely combined, so that the final nylon yarn is evenly dyed and has good light fastness and mechanical properties; on the other hand, it can effectively reduce the waste of resources and has positive significance for energy saving and environmental protection.

[0015] Preferably, the color paste comprises the following raw materials in parts by weight: 18-22 parts of dye, 1-5 parts of dispersant, 2-3 parts of erucamide, and 10-15 parts of N-methylpyrrolidone.

[0016] By adopting the above technical scheme, the present application uses dye, dispersant, erucamide, and N-methylpyrrolidone as raw materials to prepare color paste, and controls the weight of each component within a certain range, so that the dye can be evenly dispersed in N-methylpyrrolidone, effectively promoting the interaction between the color paste and the polyamide slice, making the dyeing more uniform; at the same time, erucamide is added to reduce the friction between the components, making the performance of the color paste more stable, thereby effectively improving the mechanical properties of the nylon yarn. In addition, in the process of preparing masterbatch, the masterbatch is facilitated to be extruded smoothly.

[0017] Preferably, the dispersant is prepared by compounding PEG-1000 and sodium lignin sulfonate in a mass ratio of (3-8):5.

[0018] By adopting the above technical scheme, PEG-1000 can play a dispersing role and also help to improve the flexibility of polyamide fibers; sodium lignin sulfonate has excellent dispersing properties, and the structure of sodium lignin sulfonate contains active groups such as carbonyl, phenolic hydroxyl, and alcoholic hydroxyl groups; the dispersant of the present application is obtained by compounding PEG-1000 and sodium lignin sulfonate, and the two work synergistically, not only can the components in the color paste be evenly dispersed, but also in the process of mixing the color paste with polyamide chips and functional additives, it can still play an excellent dispersing function, so that the obtained nylon yarn is evenly dyed and soft to the touch, and the light fastness and mechanical properties of the nylon yarn are significantly improved.

[0019] Preferably, the functional additive is prepared by the following method:

[0020] Step 1: dissolving cinnamic acid and nano titanium dioxide in acetone, adjusting the pH to 3-4, stirring at a speed of 1200-1600 r / min for 60-90 min, filtering, and drying to obtain modified nano titanium dioxide;

[0021] Step 2: first mix the modified nano titanium dioxide, kaolin and hemp stalk core ultrafine powder, grind to 6-10nm to obtain a mixed powder; then disperse the mixed powder in PEG-1000, rotate at a speed of 600-1000r / min, react for 60-90min, and obtain a functional additive.

[0022] By adopting the above-mentioned technical scheme, the preparation process of the functional additive of the present application is divided into two steps. First, nano titanium dioxide is modified with silicic acid to increase the surface area of ​​nano titanium dioxide and improve the ability of titanium dioxide to reflect ultraviolet rays; then the modified nano titanium dioxide, kaolin, and hemp stalk core ultrafine powder are used as raw materials to obtain the functional additive; kaolin can synergistically modify the nano titanium dioxide to further improve the anti-ultraviolet performance of the functional additive; the hemp stalk core ultrafine powder has abundant voids and good connectivity, large specific surface area, good hygroscopicity and air permeability, and the hemp stalk core ultrafine powder has adsorption properties, so that the functional additive can well adsorb color paste and polyamide, thereby improving the color fastness of the stock solution dyeing. At the same time, the hemp stalk core ultrafine powder also has excellent antibacterial and anti-ultraviolet properties.

[0023] In the process of preparing the functional additives, the present application controls various process parameters to ensure close combination of the components and promote interaction between the components, so that the functional additives have excellent anti-ultraviolet function, as well as significant antibacterial, moisture absorption and breathability functions and significant mechanical properties. As a result, the final nylon yarn has not only uniform dyeing, high light fastness and good mechanical properties, but also excellent properties such as antibacterial, moisture absorption and breathability, which makes the nylon yarn have a wider application.

[0024] Preferably, the polyamide slices are further pretreated: the polyamide slices are dispersed in ethyl acetate, titanate coupling agent and PEG-60 hydrogenated castor oil are added, the temperature is raised to 120-140° C., kept warm for 2-3 hours, cooled to 20-30° C., filtered, and dried to obtain pretreated polyamide slices.

[0025] Preferably, the mass ratio of the polyamide slice, ethyl acetate, titanate coupling agent, and PEG-60 hydrogenated castor oil is: 10:(2-3):(0.5-1):(1-2).

[0026] By adopting the above scheme, the present application pre-treats the polyamide slices and controls the various process parameters during the pre-treatment process. The titanate coupling agent can form a molecular bridge with special functions between the polyamide and the color paste and functional additives, thereby enhancing the compatibility between the polyamide, color paste and functional additives in the masterbatch, and further improving the comprehensive performance of the nylon yarn.

[0027] Preferably, in step S2, the temperature of the twin-screw extruder is 200-240°C, the speed of the twin-screw is 300-600r / min; the drying temperature is 85-150°C, and the drying time is 2-6h.

[0028] By adopting the above technical solution, the present application controls the temperature, rotation speed, drying temperature and time of the twin-screw extruder, which helps the various raw materials of the masterbatch to fully interact with each other, improves the spinnability of the masterbatch, and facilitates the subsequent spinning operation to proceed smoothly.

[0029] Preferably, in step S3, the spinning temperature is 240-290° C., the spinning speed is 3000-3500 m / min, the total draft ratio is 1.5-4.5 times, the heat setting temperature is 140-160° C., and the winding speed is 1000-4500 m / min.

[0030] By adopting the above technical scheme, the present application controls various process parameters of spinning, so that the obtained solution-dyed fiber has excellent tensile breaking performance, uniform color, and high light fastness.

[0031] In summary, this application has the following beneficial effects:

[0032] 1. The yarn solution coloring process of the present application mainly consists of three steps: preparing color paste, preparing masterbatch, and preparing yarn. The operation steps are simple, and the color and nylon yarn are completely integrated. It has amazing color expression and excellent color fastness. The performance in all aspects is better than that of traditional water-dyed fibers. It does not require traditional dyeing treatment, reduces the addition of chemicals in the production process, and makes the comprehensive performance of nylon yarn more excellent.

[0033] 2. In the process of preparing the masterbatch, the present application adds functional additives, which are prepared from raw materials such as nano titanium dioxide, cinnamic acid, acetone, kaolin, and ultrafine hemp stalk core powder. The functional additives are added in the stock solution coloring process, so that the final nylon yarn has excellent dyeing uniformity, high light fastness, good mechanical properties, and significant antibacterial and moisture absorption and breathability, thereby expanding the market application of nylon yarn.

[0034] 3. The present application also pre-treats the polyamide slices so that the polyamide slices, color paste, and functional additives can be tightly combined, thereby increasing the dye content in the nylon yarn and making the nylon yarn evenly dyed and colorful. DETAILED DESCRIPTION

[0035] The present application is further described in detail below with reference to the embodiments.

[0036] Preparation Examples 1-5 and Comparative Preparation Examples 1-4 provide functional additives and preparation methods thereof.

[0037] Preparation Example 1

[0038] Functional additives, including the following raw materials:

[0039] 30kg nano titanium dioxide, 20kg cinnamic acid, 10kg acetone, 10kg kaolin, 11kg hemp stalk core ultrafine powder, 6kg PEG-1000;

[0040] Functional additives are prepared by the following method:

[0041] Step 1: dissolving cinnamic acid and nano titanium dioxide in acetone, adjusting the pH to 3, stirring at a speed of 1200 r / min for 60 min, filtering, and drying to obtain modified nano titanium dioxide;

[0042] Step 2: first mix the modified nano titanium dioxide, kaolin and hemp stalk core ultrafine powder, grind to 6nm to obtain a mixed powder; then disperse the mixed powder in PEG-1000, rotate at 600r / min, react for 60min, and obtain a functional additive.

[0043] Preparation Example 2

[0044] Functional additives, including the following raw materials:

[0045] 32kg nano titanium dioxide, 22kg cinnamic acid, 12kg acetone, 13kg kaolin, 12kg hemp stalk core ultrafine powder, 6.5kg PEG-1000;

[0046] Functional additives are prepared by the following method:

[0047] Step 1: dissolving cinnamic acid and nano titanium dioxide in acetone, adjusting the pH to 3.2, stirring at a speed of 1300 r / min for 65 min, filtering, and drying to obtain modified nano titanium dioxide;

[0048] Step 2: first mix the modified nano titanium dioxide, kaolin and hemp stalk core ultrafine powder, grind to 7nm to obtain a mixed powder; then disperse the mixed powder in PEG-1000, rotate at 700r / min, react for 70min, and obtain a functional additive.

[0049] Preparation Example 3

[0050] Functional additives, including the following raw materials:

[0051] 35kg nano titanium dioxide, 25kg cinnamic acid, 20kg acetone, 15kg kaolin, 13kg hemp stalk core ultrafine powder, 7kg PEG-1000;

[0052] Functional additives are prepared by the following method:

[0053] Step 1: dissolving cinnamic acid and nano titanium dioxide in acetone, adjusting the pH to 3.5, stirring at a speed of 1400 r / min for 75 min, filtering, and drying to obtain modified nano titanium dioxide;

[0054] Step 2: first mix the modified nano titanium dioxide, kaolin and hemp stalk core ultrafine powder, grind to 8nm to obtain a mixed powder; then disperse the mixed powder in PEG-1000, rotate at 800r / min, react for 75min, and obtain a functional additive.

[0055] Preparation Example 4

[0056] Functional additives, including the following raw materials:

[0057] 38kg nano titanium dioxide, 27kg cinnamic acid, 25kg acetone, 18kg kaolin, 14kg hemp stalk core ultrafine powder, 7.5kg PEG-1000;

[0058] Functional additives are prepared by the following method:

[0059] Step 1: dissolving cinnamic acid and nano titanium dioxide in acetone, adjusting the pH to 3.8, stirring at a speed of 1500 r / min for 80 min, filtering, and drying to obtain modified nano titanium dioxide;

[0060] Step 2: first mix the modified nano titanium dioxide, kaolin and hemp stalk core ultrafine powder, grind to 9nm to obtain a mixed powder; then disperse the mixed powder in PEG-1000, rotate at 900r / min, react for 80min, and obtain a functional additive.

[0061] Preparation Example 5

[0062] Functional additives, including the following raw materials:

[0063] 40kg nano titanium dioxide, 30kg cinnamic acid, 30kg acetone, 20kg kaolin, 15kg hemp stalk core ultrafine powder, 8kg PEG-1000;

[0064] Functional additives are prepared by the following method:

[0065] Step 1: dissolving cinnamic acid and nano titanium dioxide in acetone, adjusting the pH to 4, stirring at a speed of 1600 r / min for 90 min, filtering, and drying to obtain modified nano titanium dioxide;

[0066] Step 2: first mix the modified nano titanium dioxide, kaolin and hemp stalk core ultrafine powder, grind to 10 nm to obtain a mixed powder; then disperse the mixed powder in PEG-1000, react at a speed of 1000 r / min for 90 minutes to obtain a functional additive.

[0067] Comparative Preparation Example 1

[0068] Comparative Preparation Example 1 is the same as Preparation Example 1, except that cinnamic acid is not added.

[0069] Comparative Preparation Example 2

[0070] Comparative Preparation Example 2 is the same as Preparation Example 1, except that modified titanium dioxide is not added to the functional additive, kaolin and hemp stalk core ultrafine powder are mixed, and the functional additive is prepared according to step 2.

[0071] Comparative Preparation Example 3

[0072] Comparative Preparation Example 3 is the same as Preparation Example 1, except that kaolin is not added.

[0073] Comparative Preparation Example 4

[0074] Comparative Preparation Example 4 is the same as Preparation Example 1, except that the ultrafine hemp stalk core powder is not added.

[0075] Preparation Examples 6-10 are methods for preparing pretreated polyamide chips.

[0076] Preparation Example 6

[0077] The pretreated polyamide chips are prepared by the following method:

[0078] Disperse 100 kg of polyamide slices in 20 kg of ethyl acetate, add 5 kg of titanate coupling agent and 10 kg of PEG-60 hydrogenated castor oil, heat to 120° C., keep warm for 2 hours, cool to 20° C., filter, and dry to obtain pretreated polyamide slices.

[0079] Preparation Example 7

[0080] The pretreated polyamide chips are prepared by the following method:

[0081] Disperse 100 kg of polyamide slices in 24 kg of ethyl acetate, add 6 kg of titanate coupling agent and 12 kg of PEG-60 hydrogenated castor oil, heat to 125° C., keep warm for 2.3 hours, cool to 23° C., filter, and dry to obtain pretreated polyamide slices.

[0082] Preparation Example 8

[0083] The pretreated polyamide chips are prepared by the following method:

[0084] 100 kg of polyamide slices were dispersed in 26 kg of ethyl acetate, and then 8 kg of titanate coupling agent and 15 kg of PEG-60 hydrogenated castor oil were added, the temperature was raised to 130° C., kept warm for 2.5 hours, cooled to 25° C., filtered, and dried to obtain pretreated polyamide slices.

[0085] Preparation Example 9

[0086] The pretreated polyamide chips are prepared by the following method:

[0087] 100 kg of polyamide slices were dispersed in 28 kg of ethyl acetate, and then 9 kg of titanate coupling agent and 17 kg of PEG-60 hydrogenated castor oil were added, the temperature was raised to 135° C., kept warm for 2.8 hours, cooled to 27° C., filtered, and dried to obtain pretreated polyamide slices.

[0088] Preparation Example 10

[0089] The pretreated polyamide chips are prepared by the following method:

[0090] 100 kg of polyamide slices were dispersed in 30 kg of ethyl acetate, and then 10 kg of titanate coupling agent and 20 kg of PEG-60 hydrogenated castor oil were added, the temperature was raised to 140° C., kept for 3 hours, cooled to 30° C., filtered, and dried to obtain pretreated polyamide slices.

[0091] Examples 1-7 provide a yarn solution dyeing process.

[0092] Example 1

[0093] A yarn solution dyeing process comprises the following steps:

[0094] S1. Prepare color paste: evenly mix 18 kg dye, 1 kg dispersant, 2 kg erucic acid amide and 10 kg N-methylpyrrolidone, and stir at a speed of 1000 r / min for 20 min to obtain color paste;

[0095] The dye is acid blue 1; the dispersant is prepared by compounding PEG-1000 and sodium lignin sulfonate in a mass ratio of 3:5;

[0096] S2, preparing masterbatch: firstly, 100kg polyamide chips, 30kg color paste and 14kg functional additives are mixed to obtain a premix; then, the premix is ​​fed into a twin-screw extruder, melt-extruded and granulated, the temperature of the twin-screw extruder is 200°C, and the speed of the twin-screw is 300r / min; after drying for 6h at a temperature of 85°C, a masterbatch is obtained;

[0097] Wherein, the polyamide is the one prepared in Example 6; the functional additive is the one prepared in Example 1;

[0098] S3, preparing yarn: the masterbatch is spun, cooled, oiled, drawn, heat-set and wound to obtain solution-dyed fiber; then the solution-dyed fiber is spun into 40tex nylon yarn;

[0099] Among them, the spinning temperature is 240°C, the spinning speed is 3000m / min, the total drawing ratio is 1.5 times, the heat setting temperature is 140°C, and the winding speed is 1000m / min.

[0100] Example 2

[0101] A yarn solution dyeing process comprises the following steps:

[0102] S1. Preparation of color paste: 19 kg of dye, 2 kg of dispersant, 2.2 kg of erucic acid amide and 11 kg of N-methylpyrrolidone were uniformly mixed, and stirred at a speed of 1200 r / min for 12 min to obtain a color paste;

[0103] The dye is acid blue 1; the dispersant is prepared by compounding PEG-1000 and sodium lignin sulfonate in a mass ratio of 4:5;

[0104] S2, preparing masterbatch: firstly, 105kg polyamide chips, 32kg color paste and 15kg functional additives are mixed to obtain a premix; then, the premix is ​​fed into a twin-screw extruder, melt-extruded and granulated, the temperature of the twin-screw extruder is 210°C, and the speed of the twin screw is 400r / min; after drying for 5h at a temperature of 100°C, a masterbatch is obtained;

[0105] Wherein, the polyamide is prepared in Example 7; the functional additive is prepared in Example 2;

[0106] S3, preparing yarn: the masterbatch is spun, cooled, oiled, drawn, heat-set and wound to obtain solution-dyed fiber; then the solution-dyed fiber is spun into 40tex nylon yarn;

[0107] Among them, the spinning temperature is 250°C, the spinning speed is 3100 m / min, the total drawing ratio is 2 times, the heat setting temperature is 145°C, and the winding speed is 2000 m / min.

[0108] Example 3

[0109] A yarn solution dyeing process comprises the following steps:

[0110] S1. Preparation of color paste: 20 kg of dye, 3 kg of dispersant, 2.5 kg of erucic acid amide and 13 kg of N-methylpyrrolidone were uniformly mixed, and stirred at a speed of 1300 r / min for 15 min to obtain a color paste;

[0111] The dye is acid blue 1; the dispersant is prepared by compounding PEG-1000 and sodium lignin sulfonate in a mass ratio of 1:1;

[0112] S2, preparing masterbatch: firstly, 110kg polyamide chips, 35kg color paste and 16kg functional additives are mixed to obtain a premix; then, the premix is ​​fed into a twin-screw extruder, melt-extruded and granulated, the temperature of the twin-screw extruder is 220°C, and the speed of the twin screw is 450r / min; after drying for 4h at a temperature of 120°C, a masterbatch is obtained;

[0113] Wherein, the polyamide is prepared in Example 8; the functional additive is prepared in Example 3;

[0114] S3, preparing yarn: the masterbatch is spun, cooled, oiled, drawn, heat-set and wound to obtain solution-dyed fiber; then the solution-dyed fiber is spun into yarn;

[0115] Among them, the spinning temperature is 260°C, the spinning speed is 3200 m / min, the total drawing ratio is 2.5 times, the heat setting temperature is 150°C, and the winding speed is 3000 m / min.

[0116] Example 4

[0117] A yarn solution dyeing process comprises the following steps:

[0118] S1. Preparation of color paste: 21 kg of dye, 4 kg of dispersant, 2.8 kg of erucic acid amide and 14 kg of N-methylpyrrolidone were uniformly mixed, and stirred at a speed of 1400 r / min for 18 min to obtain a color paste;

[0119] The dye is acid blue 1; the dispersant is prepared by compounding PEG-1000 and sodium lignin sulfonate in a mass ratio of 6:5;

[0120] S2, preparing masterbatch: firstly, 100kg polyamide chips, 38kg color paste and 17kg functional additives are mixed to obtain a premix; then, the premix is ​​fed into a twin-screw extruder, melt-extruded and granulated, the temperature of the twin-screw extruder is 230°C, and the speed of the twin screw is 500r / min; after drying for 3h at a temperature of 140°C, a masterbatch is obtained;

[0121] Wherein, the polyamide is prepared in Example 9; the functional additive is prepared in Example 4;

[0122] S3, preparing yarn: the masterbatch is spun, cooled, oiled, drawn, heat-set and wound to obtain solution-dyed fiber; then the solution-dyed fiber is spun into yarn;

[0123] Among them, the spinning temperature is 280°C, the spinning speed is 3400m / min, the total drawing ratio is 4 times, the heat setting temperature is 155°C, and the winding speed is 4000m / min.

[0124] Example 5

[0125] A yarn solution dyeing process comprises the following steps:

[0126] S1. Preparation of color paste: 22 kg of dye, 5 kg of dispersant, 3 kg of erucic acid amide and 15 kg of N-methylpyrrolidone were uniformly mixed, and stirred at a speed of 1500 r / min for 20 min to obtain a color paste;

[0127] The dye is acid blue 1; the dispersant is prepared by compounding PEG-1000 and sodium lignin sulfonate in a mass ratio of 7:5;

[0128] S2, preparing masterbatch: firstly, 100kg polyamide chips, 40kg color paste and 18kg functional additives are mixed to obtain a premix; then, the premix is ​​fed into a twin-screw extruder, melt-extruded and granulated, the temperature of the twin-screw extruder is 240° C., and the speed of the twin screw is 600r / min; after drying for 2h at a temperature of 150° C., a masterbatch is obtained;

[0129] Wherein, the polyamide is the one of Preparation Example 10; the functional additive is the one of Preparation Example 5;

[0130] S3, preparing yarn: the masterbatch is spun, cooled, oiled, drawn, heat-set and wound to obtain solution-dyed fiber; then the solution-dyed fiber is spun into 40tex nylon yarn;

[0131] Among them, the spinning temperature is 290°C, the spinning speed is 3500m / min, the total drawing ratio is 4.5 times, the heat setting temperature is 160°C, and the winding speed is 4500m / min.

[0132] Example 6

[0133] Example 6 is the same as Example 1, except that the dye is Disperse Red 1.

[0134] Example 7

[0135] Example 7 is the same as Example 1, except that the dye is solvent black 28.

[0136] In order to verify the performance of nylon yarns obtained by the solution dyeing process in Examples 1-7 of the present application, the applicant set up comparative examples 1-9, which are as follows:

[0137] Comparative Example 1

[0138] Comparative Example 1 is the same as Example 1, except that the dispersant is PEG-1000.

[0139] Comparative Example 2

[0140] Comparative Example 2 is the same as Example 1, except that the dispersant is sodium lignin sulfonate.

[0141] Comparative Example 3

[0142] Comparative Example 3 is the same as Example 1, except that no dispersant is added.

[0143] Comparative Example 4

[0144] Comparative Example 4 is the same as Example 1, except that the functional auxiliary agent is that of Comparative Preparation Example 1.

[0145] Comparative Example 5

[0146] Comparative Example 5 is the same as Example 1, except that the functional auxiliary agent is that of Comparative Preparation Example 2.

[0147] Comparative Example 6

[0148] Comparative Example 6 is the same as Example 1, except that the functional auxiliary agent is that of Comparative Preparation Example 3.

[0149] Comparative Example 7

[0150] Comparative Example 7 is the same as Example 1, except that the functional auxiliary agent is that of Comparative Preparation Example 4.

[0151] Comparative Example 8

[0152] Comparative Example 8 is the same as Example 1, except that no functional additive is added.

[0153] Comparative Example 9

[0154] Comparative Example 9 is the same as Example 1, except that the polyamide slices are not pretreated.

[0155] The properties of the nylon yarns obtained by the solution dyeing process in Examples 1-7 and Comparative Examples 1-9 of the present application were respectively tested, and the following result parameters were obtained, as shown in Table 1:

[0156] According to GB / T3916-2013 "Determination of breaking strength and elongation of single yarn in packaged textiles", the tensile breaking properties of nylon yarn were tested; the K / S value of the sample was measured using a color measurement and matching system, each sample was tested 3 times, and the average value was taken; according to GB / T8427-2019 "Textiles - Tests for color fastness - Color fastness to artificial light: Xenon arc shading", the nylon yarn was woven into fabric and the color fastness to light was tested.

[0157] Table 1:

[0158] Breaking strength (cN / dtex) K / S value Color fastness to light / grade Example 1 3.65 21.92 4-5 Example 2 4.18 22.88 5 Example 3 4.65 23.53 5 Example 4 5.01 22.93 5 Example 5 4.89 22.89 4-5 Example 6 3.98 22.08 5 Example 7 3.74 21.56 4-5 Comparative Example 1 3.32 17.63 3-4 Comparative Example 2 3.14 18.85 3-4 Comparative Example 3 3.02 16.32 2-3 Comparative Example 4 3.38 20.32 3-4 Comparative Example 5 3.07 19.06 2 Comparative Example 6 3.04 19.13 2-3 Comparative Example 7 3.12 18.68 1-3 Comparative Example 8 2.89 16.52 1 Comparative Example 9 2.45 15.06 2

[0159] From the data shown in Table 1 above, it can be seen that the performance of the nylon yarn prepared by the solution coloring process in Examples 1-7 of the present application is much better than that of the nylon yarn prepared in Comparative Examples 1-9. The nylon yarn has a large tensile breaking strength, a large K / S value, and a light color fastness level of 4 or above, which fully demonstrates that the nylon yarn prepared by the solution coloring process of the present application has excellent mechanical properties, strong UV resistance, uniform dyeing, and bright colors, which expands the application prospects of nylon yarns. The solution coloring process of the present application greatly reduces the huge energy consumption loss and environmental pollution caused by the printing and dyeing process, and has positive significance for energy saving and environmental protection.

[0160] It can be seen from Example 1 and Comparative Examples 1 and 2 that the dispersant in Example 1 is obtained by compounding PEG-1000 and sodium lignin sulfonate. Compared with Comparative Examples 1 and 2, it can be seen that the breaking strength of the nylon yarn prepared in Example 1 is significantly improved, the dyeing is uniform, and the light fastness grade is high.

[0161] It can be seen from Example 1 and Comparative Example 3 that: in Example 1, a dispersant is added during the preparation of the color paste, and the nylon yarn prepared in Example 1 is more evenly dyed than in Comparative Example 3, indicating that the color paste in Example 1 has a better dyeing effect.

[0162] It can be seen from Example 1 and Comparative Examples 4-7 that the functional additive in Example 1 is made from raw materials such as nano-titanium dioxide, cinnamic acid, kaolin, and ultrafine hemp stalk core powder. Compared with Comparative Examples 4-7, the light fastness of the nylon yarn prepared in Example 1 is greatly improved.

[0163] It can be seen from Example 1 and Comparative Example 8 that in Example 1, the functional additive is added during the preparation of the masterbatch. Compared with Comparative Example 8, the mechanical properties and light fastness grade of the nylon yarn prepared in Example 1 are improved, and the comprehensive performance of the nylon yarn is more excellent.

[0164] It can be seen from Example 1 and Comparative Example 9 that the polyamide slices in Example 1 are pretreated, and the nylon yarn prepared in Example 1 is dyed evenly, has bright color, and has better mechanical properties and light fastness than Comparative Example 9.

[0165] This specific embodiment is merely an explanation of the present application and is not a limitation of the present application. After reading this specification, those skilled in the art may make modifications to the present embodiment without any creative contribution as needed, but such modifications are protected by the patent law as long as they are within the scope of the claims of the present application.

Claims

1. A yarn solution dyeing process, characterized in that: The steps include: S1. Preparing color paste: uniformly mixing the dye, dispersant, erucic acid amide and N-methylpyrrolidone to obtain a color paste; S2, preparing masterbatch: firstly, mixing polyamide slices, color paste and functional additives to obtain a premix; then feeding the premix into a twin-screw extruder, melt-extruding and granulating, and drying to obtain a masterbatch; S3, preparing yarn: the masterbatch is spun, cooled, oiled, drawn, heat-set and wound to obtain solution-dyed fiber; then the solution-dyed fiber is spun into yarn; The functional additive comprises the following raw materials in parts by weight: 30-40 parts of nano titanium dioxide, 20-30 parts of cinnamic acid, 10-30 parts of acetone, 10-20 parts of kaolin, 11-15 parts of hemp stalk core ultrafine powder, and 6-8 parts of PEG-1000; The mass ratio of the polyamide slice, the color paste and the functional additive is (100-120):(30-40):(14-18); The color paste comprises the following raw materials in parts by weight: 18-22 parts of dye, 1-5 parts of dispersant, 2-3 parts of erucamide, and 10-15 parts of N-methylpyrrolidone; The dispersant is prepared by compounding PEG-1000 and sodium lignin sulfonate in a mass ratio of (3-8):5; The functional additive is prepared by the following method: Step 1: dissolving cinnamic acid and nano titanium dioxide in acetone, adjusting the pH to 3-4, stirring at a speed of 1200-1600 r / min for 60-90 min, filtering, and drying to obtain modified nano titanium dioxide; Step 2: first mix the modified nano titanium dioxide, kaolin and hemp stalk core ultrafine powder, grind to 6-10nm to obtain a mixed powder; then disperse the mixed powder in PEG-1000, rotate at a speed of 600-1000r / min, react for 60-90min, and obtain a functional additive.

2. The yarn solution dyeing process according to claim 1, characterized in that: The polyamide slices are also pretreated: the polyamide slices are dispersed in ethyl acetate, titanate coupling agent and PEG-60 hydrogenated castor oil are added, the temperature is raised to 120-140° C., kept for 2-3 hours, cooled to 20-30° C., filtered, and dried to obtain pretreated polyamide slices.

3. The yarn solution dyeing process according to claim 2, characterized in that: The mass ratio of the polyamide slice, ethyl acetate, titanate coupling agent and PEG-60 hydrogenated castor oil is: 10:(2-3):(0.5-1):(1-2).

4. The yarn solution dyeing process according to claim 1, characterized in that: In the step S2, the temperature of the twin-screw extruder is 200-240°C, the speed of the twin-screw is 300-600r / min; the drying temperature is 85-150°C, and the drying time is 2-6h.

5. The yarn solution dyeing process according to claim 1, characterized in that: In the step S3, the spinning temperature is 240-290° C., the spinning speed is 3000-3500 m / min, the total draft ratio is 1.5-4.5 times, the heat setting temperature is 140-160° C., and the winding speed is 1000-4500 m / min.