Rapid dyeing method of dark grey polyester-cotton knitted fabric

Abstract

The invention provides a rapid dyeing method of a dark gray polyester-cotton knitted fabric, which comprises the following steps: (1) pre-treating the polyester-cotton knitted fabric, then carrying out polyester dyeing on the polyester-cotton knitted fabric by adopting a polyester dyeing solution, carrying out primary drainage, and then sequentially carrying out reduction cleaning and secondary drainage to obtain a semi-dyed knitted fabric; the polyester dyeing liquid comprises a dispersing and leveling agent TF213; and (2) carrying out cotton dyeing on the semi-dyed knitted fabric obtained in the step (1) by adopting a cotton dyeing solution, and then carrying out cotton post-treatment to obtain the dark gray polyester-cotton knitted fabric. The total consumed time in the dyeing process is greatly shortened through the specific dispersing and leveling agent, and the color stability and fastness of the obtained dark gray polyester-cotton knitted fabric are equivalent to those of a traditional dyeing process.

Description

Technical Field

[0001] The invention belongs to the technical field of textile printing and dyeing, and relates to a dyeing method for a polyester-cotton knitted fabric, in particular to a rapid dyeing method for a dark grey polyester-cotton knitted fabric. Background Art

[0002] In the textile printing and dyeing industry, the inspection indicators of knitted fabrics include color, fabric quality and internal fastness. Various colors are mainly composed of three primary colors: red, yellow and blue, and there are three indicators: depth, freshness and color light. Among them, gray is a particularly sensitive color. When the strength and dosage of the three primary colors are almost equal, gray can be dyed. If the three primary colors are dyed slightly unevenly on a certain part of the knitted fabric, there will be more red, yellow or blue. The left, middle and right sides of the fabric and the front, middle and back are very likely to have obvious color differences that are irritating to the human eye, and the color light is reddish, greenish, blueish and yellowish. Therefore, light gray, medium gray and especially dark gray are difficult to adjust the color, and it is even more difficult to achieve color uniformity in the production process.

[0003] The traditional method of dyeing dark gray polyester-cotton knitted fabrics is: first perform pre-treatment scouring in the dyeing machine to remove oil impurities, then perform disperse dye polyester high-temperature 130°C dyeing and reduction cleaning, and finally perform cotton dyeing and post-treatment to clean floating colors. According to the disperse dye polyester dyeing principle, in order to ensure the color uniformity of polyester fiber dyeing, for sensitive colors such as dark gray, it is necessary to maintain a slow heating rate above the glass transition temperature of 80°C, and at the same time, sufficient dyeing time is required to achieve dyeing dynamic balance and obtain qualified color difference quality. However, the above dyeing process has low production efficiency and high energy consumption costs.

[0004] CN 118273138A discloses a method for dyeing dark grey silk fabric, the method comprising: (1) preparing a dark yellow natural dye liquor by using liquidambar leaves; (2) immersing the silk fabric in the dark yellow natural dye liquor to obtain a light yellow silk fabric after immersion; (3) mixing a mordant and the light yellow silk fabric to obtain a dark grey silk fabric after immersion. The method provided in the patent realizes the dark grey dyeing of silk fabric by using natural dyes and mordants, but is not suitable for polyester-cotton knitted fabrics.

[0005] CN 106012610A discloses a dyeing method for polyester-cotton blended knitted fabric, which includes the steps of pretreatment, dyeing of the polyester part and oxygen bleaching of the cotton part, dyeing of the cotton part, and post-treatment. Although the method provided in the patent discloses a dyeing method for polyester-cotton blended knitted fabric, it does not disclose whether it is suitable for dyeing sensitive colors such as dark gray.

[0006] In summary, it is necessary to provide a rapid dyeing method with low energy consumption cost and high production efficiency. Summary of the invention

[0007] In view of the shortcomings of the prior art, the present invention aims to provide a method for rapid dyeing of dark grey polyester-cotton knitted fabric. The method greatly shortens the total time consumption in the dyeing process by using a specific dispersing leveling agent, and the color stability and fastness of the obtained cotton-surface polyester-bottom knitted fabric are comparable to those of the traditional dyeing process.

[0008] In order to achieve the purpose of the invention, the present invention adopts the following technical solutions:

[0009] The present invention provides a method for rapid dyeing of dark grey polyester-cotton knitted fabric, the method comprising the following steps:

[0010] (1) pre-treating a polyester-cotton knitted fabric, and then using a polyester dyeing solution to perform polyester dyeing on the polyester-cotton knitted fabric, and after primary drainage, performing reduction cleaning and secondary drainage in sequence to obtain a semi-dyed knitted fabric;

[0011] The polyester dyeing solution includes a dispersing and leveling agent TF213;

[0012] (2) using cotton dyeing liquid to dye the semi-dyed knitted fabric obtained in step (1), and then performing cotton post-treatment to obtain the dark grey polyester-cotton knitted fabric.

[0013] The rapid dyeing method of the present invention can accelerate the heating rate of polyester dyeing and shorten the insulation time of the polyester dyeing process by selecting a dispersing leveling agent TF213 with strong and efficient characteristics and using a water flow dyeing machine with stronger leveling properties, thereby greatly shortening the total time consumed in the dyeing process. In addition, the color stability and fastness of the dark gray polyester-cotton knitted fabric obtained by the method provided by the present invention are comparable to those of the traditional dyeing process.

[0014] As a preferred technical solution of the present invention, the cotton content of the polyester-cotton knitted fabric is 50-55wt%, for example, it can be 50wt%, 51wt%, 52wt%, 53wt%, 54wt% or 55wt%, but is not limited to the listed values, and other values ​​not listed within the numerical range are also applicable.

[0015] Furthermore, the polyester-cotton knitted fabric of the present invention is a cotton-surface polyester-bottom knitted fabric (polyester-cotton containing spandex fabric), wherein the cotton content is 50-55wt% and the polyester content is 45-50wt%.

[0016] As a preferred technical solution of the present invention, the pretreatment in step (1) includes: adding sodium hydroxide and hydrogen peroxide in sequence at a constant temperature, then heating to a first temperature at a first heating rate, then heating to a holding temperature at a second heating rate, and then cooling and draining the mixture after holding.

[0017] Preferably, the constant temperature is 55-65°C, for example, 55°C, 57°C, 59°C, 61°C, 63°C or 65°C, but is not limited to the listed values, and other values ​​not listed within the numerical range are also applicable.

[0018] Preferably, the addition amount of the sodium hydroxide is 1-2 g / L, for example, it can be 1 g / L, 1.2 g / L, 1.4 g / L, 1.6 g / L, 1.8 g / L or 2 g / L, but is not limited to the listed values, and other values ​​not listed within the numerical range are also applicable.

[0019] Preferably, the amount of hydrogen peroxide added is 1-2 g / L, for example, 1 g / L, 1.2 g / L, 1.4 g / L, 1.6 g / L, 1.8 g / L or 2 g / L, but is not limited to the listed values, and other values ​​not listed within the numerical range are also applicable.

[0020] Preferably, the first heating rate is 5 to 8°C / min, for example, it can be 5°C / min, 5.5°C / min, 6°C / min, 6.5°C / min, 7°C / min, 7.5°C / min or 8°C / min, but is not limited to the listed values, and other values ​​not listed within the numerical range are also applicable.

[0021] Preferably, the first temperature is 75-85°C, for example, 75°C, 77°C, 79°C, 81°C, 83°C or 85°C, but is not limited to the listed values, and other values ​​not listed within the numerical range are also applicable.

[0022] Preferably, the second heating rate is 2.5 to 3.5°C / min, for example, it can be 2.5°C / min, 2.7°C / min, 2.9°C / min, 3.1°C / min, 3.3°C / min or 3.5°C / min, but is not limited to the listed values, and other values ​​not listed within the numerical range are also applicable.

[0023] Preferably, the insulation temperature is 90-110°C, for example, it can be 90°C, 94°C, 98°C, 102°C, 106°C or 110°C, but is not limited to the listed values, and other values ​​not listed within the numerical range are also applicable.

[0024] Preferably, the insulation time is 25 to 35 minutes, for example, it can be 25 minutes, 27 minutes, 29 minutes, 31 minutes, 33 minutes or 35 minutes, but is not limited to the listed values, and other values ​​not listed within the numerical range are also applicable.

[0025] Preferably, the cooling rate of the cooling treatment is 0.8-1.5°C / min, for example, it can be 0.8°C / min, 0.9°C / min, 1°C / min, 1.1°C / min, 1.2°C / min, 1.3°C / min, 1.4°C / min or 1.5°C / min, but is not limited to the listed values, and other values ​​not listed within the numerical range are also applicable.

[0026] Preferably, the terminal temperature of the cooling treatment is 65-75°C, for example, it can be 65°C, 67°C, 69°C, 71°C, 73°C or 75°C, but is not limited to the listed values, and other values ​​not listed within the numerical range are also applicable.

[0027] As a preferred technical solution of the present invention, in step (1), the polyester dyeing solution comprises the following components by mass concentration: 1.8-2.3% (owf) of disperse dye, 1.0-2.0 g / L of dispersing leveling agent TF213, and 0.5-1.5 g / L of acetic acid.

[0028] Exemplarily, the content of disperse dye in the polyester dyeing solution is 1.8-2.3% (owf), for example, it can be 1.8% (owf), 1.9% (owf), 2.0% (owf), 2.1% (owf), 2.2% (owf) or 2.3% (owf), but is not limited to the listed values, and other values ​​not listed within the numerical range are also applicable;

[0029] The content of the dispersing and leveling agent TF213 in the polyester dyeing solution is 1.0 to 2.0 g / L, for example, it can be 1.0 g / L, 1.2 g / L, 1.4 g / L, 1.6 g / L, 1.8 g / L or 2 g / L, but is not limited to the listed values, and other values ​​not listed within the numerical range are also applicable;

[0030] The content of acetic acid in the polyester dyeing solution is 0.5-1.5 g / L, for example, it can be 0.5 g / L, 0.7 g / L, 0.9 g / L, 1.1 g / L, 1.3 g / L or 1.5 g / L, but is not limited to the listed values, and other values ​​not listed within the numerical range are also applicable.

[0031] The dispersing and leveling agent TF213 in the polyester dyeing solution of the present invention is one of the important factors in shortening the dyeing time. If the content of the dispersing and leveling agent TF213 is too high, the dye uptake rate of the dye on the fiber will be low and the color will be light. If the content is too low, the dye will be unevenly dispersed, resulting in quality problems such as color difference and color stains.

[0032] Preferably, the disperse dyes include disperse yellow, disperse dark blue and disperse red.

[0033] Preferably, the mass ratio of the disperse yellow, disperse dark blue and disperse bright red is 1:1:0.9-1.1, for example, it can be 1:1:0.9, 1:1:0.94, 1:1:0.98, 1:1:1.02, 1:1:1.06 or 1:1:1.1, but is not limited to the listed values, and other values ​​not listed within the numerical range are also applicable.

[0034] As a preferred technical solution of the present invention, the polyester dyeing in step (1) includes constant temperature feeding, step rate heating, heat preservation treatment and one cooling treatment in sequence.

[0035] Preferably, the temperature of the constant temperature feeding is 55-65°C, for example, it can be 55°C, 57°C, 59°C, 61°C, 63°C or 65°C, but is not limited to the listed values, and other values ​​not listed within the numerical range are also applicable.

[0036] Preferably, dispersing and leveling agent TF213, acetic acid and disperse dye are added to the constant temperature feed in sequence.

[0037] Preferably, the step rate heating includes a first heating and a second heating performed sequentially.

[0038] Preferably, the first heating rate is 2.5 to 3.5°C / min, for example, 2.5°C / min, 2.7°C / min, 2.9°C / min, 3.1°C / min, 3.3°C / min or 3.5°C / min, but is not limited to the listed values, and other values ​​not listed within the numerical range are also applicable.

[0039] Preferably, the endpoint temperature of the first heating is 75-85°C, for example, it can be 75°C, 77°C, 79°C, 81°C, 83°C or 85°C, but is not limited to the listed values, and other values ​​not listed within the numerical range are also applicable.

[0040] Preferably, the second heating rate is 1.5 to 2.5°C / min, for example, 1.5°C / min, 1.7°C / min, 1.9°C / min, 2.1°C / min, 2.3°C / min or 2.5°C / min, but is not limited to the listed values, and other values ​​not listed within the numerical range are also applicable.

[0041] Preferably, the temperature of the heat preservation treatment is 125-135°C, for example, it can be 125°C, 127°C, 129°C, 131°C, 133°C or 135°C, but is not limited to the listed values, and other values ​​not listed within the numerical range are also applicable.

[0042] Preferably, the insulation treatment time is 40 to 60 minutes, for example, it can be 40 minutes, 44 minutes, 48 ​​minutes, 52 minutes, 56 minutes or 60 minutes, but is not limited to the listed values, and other values ​​not listed within the numerical range are also applicable.

[0043] Preferably, the cooling rate of the primary cooling treatment is 1 to 2°C / min, for example, 1°C / min, 1.2°C / min, 1.4°C / min, 1.6°C / min, 1.8°C / min or 2°C / min, but is not limited to the listed values, and other values ​​not listed within the numerical range are also applicable.

[0044] Preferably, the endpoint temperature of the cooling treatment is 45-50°C, for example, 45°C, 46°C, 47°C, 48°C, 49°C or 50°C, but is not limited to the listed values, and other values ​​not listed within the numerical range are also applicable.

[0045] As a preferred technical solution of the present invention, the solid-to-liquid ratio of the polyester-cotton knitted fabric to the polyester dyeing solution in the polyester dyeing in step (1) is 1:4.5-5.5, for example, it can be 1:4.5, 1:4.7, 1:4.9, 1:5.1, 1:5.3 or 1:5.5, but is not limited to the listed values, and other values ​​not listed within the numerical range are also applicable.

[0046] It is worth noting that the present invention further includes a water washing process before the reduction cleaning in step (1), and the water washing temperature is 50°C.

[0047] As a preferred technical solution of the present invention, the reduction cleaning in step (1) includes: heating to the cleaning temperature at a constant rate, maintaining the temperature and performing a secondary cooling treatment after the cleaning.

[0048] Preferably, the cleaning reagent used in the reduction cleaning comprises the following components by mass concentration: 2.0-3.0 g / L of reduction cleaning agent N, 2.0-3.0 g / L of penetrant M, and 0.5-1 g / L of acetic acid.

[0049] Exemplarily, the content of the reducing cleaning agent N in the cleaning reagent is 2.0 to 3.0 g / L, for example, 2.0 g / L, 2.2 g / L, 2.4 g / L, 2.6 g / L, 2.8 g / L or 3.0 g / L, but is not limited to the listed values, and other values ​​not listed within the numerical range are also applicable;

[0050] The content of the penetrant M in the cleaning reagent is 2.0 to 3.0 g / L, for example, 2.0 g / L, 2.2 g / L, 2.4 g / L, 2.6 g / L, 2.8 g / L or 3.0 g / L, but is not limited to the listed values, and other values ​​not listed within the numerical range are also applicable;

[0051] The content of acetic acid in the cleaning reagent is 0.5-1 g / L, for example, it can be 0.5 g / L, 0.6 g / L, 0.7 g / L, 0.8 g / L, 0.9 g / L or 1.0 g / L, but is not limited to the listed values, and other values ​​not listed within the numerical range are also applicable.

[0052] Preferably, the heating rate in the constant rate heating is 2.5 to 3.5°C / min, for example, 2.5°C / min, 2.7°C / min, 2.9°C / min, 3.1°C / min, 3.3°C / min or 3.5°C / min, but is not limited to the listed values, and other values ​​not listed within the numerical range are also applicable.

[0053] Preferably, acetic acid, penetrant M and reducing cleaning agent N are added in sequence during the constant rate heating.

[0054] Preferably, the thermal insulation and cleaning temperature is 75-85°C, for example, it can be 75°C, 77°C, 79°C, 81°C, 83°C or 85°C, but is not limited to the listed values, and other values ​​not listed within the numerical range are also applicable.

[0055] Preferably, the reduction cleaning time is 20 to 40 minutes, for example, 20 minutes, 24 minutes, 28 minutes, 32 minutes, 36 minutes or 40 minutes, but is not limited to the listed values, and other values ​​not listed within the numerical range are also applicable.

[0056] Preferably, the cooling rate of the secondary cooling treatment is 1 to 2°C / min, for example, it can be 1°C / min, 1.2°C / min, 1.4°C / min, 1.6°C / min, 1.8°C / min or 2°C / min, but is not limited to the listed values, and other values ​​not listed within the numerical range are also applicable.

[0057] Preferably, the cooling end point of the cooling treatment is 45-50°C, for example, it can be 45°C, 46°C, 47°C, 48°C, 49°C or 50°C, but is not limited to the listed values, and other values ​​not listed within the numerical range are also applicable.

[0058] As a preferred technical solution of the present invention, the cotton dyeing solution in step (2) comprises the following components by mass concentration: 2-2.5% (owf) of reactive dyes, 20-25 g / L of soda ash, and 80-90 g / L of sodium sulfate.

[0059] Exemplarily, the content of the reactive dye in the cotton dyeing solution is 2 to 2.5% (owf), for example, it can be 2% (owf), 2.1% (owf), 2.2% (owf), 2.3% (owf), 2.4% (owf) or 2.5% (owf), but is not limited to the listed values, and other values ​​not listed within the numerical range are also applicable;

[0060] The content of soda ash in the cotton dyeing solution is 20-25 g / L, for example, it can be 20 g / L, 21 g / L, 22 g / L, 23 g / L, 24 g / L or 25 g / L, but is not limited to the listed values, and other values ​​not listed within the numerical range are also applicable;

[0061] The content of sodium sulfate in the cotton dyeing solution is 80-90 g / L, for example, it can be 80 g / L, 82 g / L, 84 g / L, 86 g / L, 88 g / L or 90 g / L, but is not limited to the listed values, and other values ​​not listed within the numerical range are also applicable.

[0062] Preferably, the reactive dyes include yellow, red, blue and black.

[0063] Preferably, the mass ratio of yellow, red, blue and black is 1-1.2:1:1:1, for example, it can be 1:1:1:1, 1.05:1:1:1, 1.1:1:1:1, 1.15:1:1:1 or 1.2:1:1:1, but is not limited to the listed values, and other values ​​within the numerical range not listed are also applicable.

[0064] As a preferred technical solution of the present invention, the cotton dyeing in step (2) includes constant temperature feeding, constant rate heating, heat preservation treatment and three cooling treatments in sequence.

[0065] Preferably, the temperature of the constant temperature feeding is 40-45°C, for example, it can be 40°C, 41°C, 42°C, 43°C, 44°C or 45°C, but is not limited to the listed values, and other values ​​not listed within the numerical range are also applicable.

[0066] Preferably, active dyes, sodium sulfate and baking soda are added in sequence to the constant temperature feeding.

[0067] Preferably, the interval between adding the reactive dye and sodium sulfate is 10 to 15 minutes, for example, 10 minutes, 11 minutes, 12 minutes, 13 minutes, 14 minutes or 15 minutes, but is not limited to the listed values, and other values ​​not listed within the numerical range are also applicable;

[0068] Preferably, the interval time for adding the sodium sulfate and baking soda is 20 to 25 minutes, for example, it can be 20 minutes, 21 minutes, 22 minutes, 23 minutes, 24 minutes or 25 minutes, but it is not limited to the listed values, and other values ​​not listed within the numerical range are also applicable.

[0069] It is worth noting that the reason why the present invention limits the order and time interval of adding the reactive dye, sodium sulfate and soda ash is that: according to the reactive dye dyeing principle, sodium sulfate has a promoting effect on the dye dyeing of the fiber, and soda ash is used to provide a high pH environment so that the reactive dye reacts chemically with the fiber and fixes the dye on the fiber;

[0070] The present invention can realize free diffusion of active dyes by first adding sodium sulfate, and then realize dye fixation by regulating the dyeing environment through baking soda; if baking soda is added first, the dyes will be unevenly dispersed, thus causing quality problems such as color difference, color stains and color spots.

[0071] Preferably, the constant rate heating rate is 0.5-1°C / min, for example, 0.5°C / min, 0.6°C / min, 0.7°C / min, 0.8°C / min, 0.9°C / min or 1°C / min, but is not limited to the listed values, and other values ​​not listed within the numerical range are also applicable.

[0072] Preferably, the temperature of the heat preservation treatment is 50-55°C, for example, it can be 50°C, 51°C, 52°C, 53°C, 54°C or 55°C, but is not limited to the listed values, and other values ​​not listed within the numerical range are also applicable.

[0073] Preferably, the insulation treatment time is 50 to 60 minutes, for example, it can be 50 minutes, 52 minutes, 54 minutes, 56 minutes, 58 minutes or 60 minutes, but it is not limited to the listed values, and other values ​​not listed within the numerical range are also applicable.

[0074] Preferably, the solid-to-liquid ratio of the knitted fabric to the cotton dyeing liquid in the cotton dyeing in step (2) is 1:4.5-5.5, for example, it can be 1:4.5, 1:4.7, 1:4.9, 1:5.1, 1:5.3 or 1:5.5, but is not limited to the listed values, and other values ​​not listed within the numerical range are also applicable.

[0075] As a preferred technical solution of the present invention, the cotton post-treatment in step (2) includes acetic acid cleaning, penetrant cleaning and water washing in sequence.

[0076] Preferably, the insulation temperature of the acetic acid cleaning is 55-65°C, for example, it can be 55°C, 57°C, 59°C, 61°C, 63°C or 65°C, but is not limited to the listed values, and other values ​​not listed within the numerical range are also applicable.

[0077] Preferably, the holding time for the acetic acid cleaning is 10 to 20 minutes, for example, 10 minutes, 12 minutes, 14 minutes, 16 minutes, 18 minutes or 20 minutes, but is not limited to the listed values, and other values ​​not listed within the numerical range are also applicable.

[0078] Preferably, the concentration of acetic acid used in the acetic acid cleaning is 0.5-1 g / L, for example, it can be 0.5 g / L, 0.6 g / L, 0.7 g / L, 0.8 g / L, 0.9 g / L or 1 g / L, but is not limited to the listed values, and other values ​​not listed within the numerical range are also applicable.

[0079] Preferably, the insulation temperature of the penetrant cleaning is 70-80°C, for example, it can be 70°C, 72°C, 74°C, 76°C, 78°C or 80°C, but is not limited to the listed values, and other values ​​not listed within the numerical range are also applicable.

[0080] Preferably, the holding time for the penetrant cleaning is 10 to 20 minutes, for example, 10 minutes, 12 minutes, 14 minutes, 16 minutes, 18 minutes or 20 minutes, but is not limited to the listed values, and other values ​​not listed within the numerical range are also applicable.

[0081] Preferably, the concentration of the penetrant M used for the penetrant cleaning is 1.0-1.5 g / L, for example, it can be 1.0 g / L, 1.1 g / L, 1.2 g / L, 1.3 g / L, 1.4 g / L or 1.5 g / L, but is not limited to the listed values, and other values ​​not listed within the numerical range are also applicable.

[0082] Preferably, the water washing insulation temperature is 45-55°C, for example, it can be 45°C, 47°C, 49°C, 51°C, 53°C or 55°C, but is not limited to the listed values, and other values ​​not listed within the numerical range are also applicable.

[0083] Preferably, the water washing insulation time is 5 to 15 minutes, for example, it can be 5 minutes, 7 minutes, 9 minutes, 11 minutes, 13 minutes or 15 minutes, but it is not limited to the listed values, and other values ​​not listed within the numerical range are also applicable.

[0084] It is worth noting that the water washing in the cotton post-treatment in step (3) of the present invention includes two consecutive water washing processes under the same conditions.

[0085] In addition, the cotton post-processing in step (3) of the present invention also includes loosening the cloth, pressing water, drying, finalizing the finished product, inspecting, rolling up and storing in a warehouse.

[0086] As a preferred technical solution of the present invention, the rapid dyeing method of dark grey polyester-cotton knitted fabric provided by the present invention comprises the following steps:

[0087] (1) pre-treating a polyester-cotton knitted fabric, and then using a polyester dyeing solution to perform polyester dyeing on the polyester-cotton knitted fabric, and after primary drainage, performing reduction cleaning and secondary drainage in sequence to obtain a semi-dyed knitted fabric;

[0088] The polyester dyeing solution comprises the following components by mass concentration: 1.8-2.3% (owf) of disperse dye, 1.0-2.0 g / L of disperse leveling agent TF213, and 0.5-1.5 g / L of acetic acid; the disperse dye comprises disperse yellow, disperse dark blue and disperse scarlet in a mass ratio of 1:1:0.9-1.1;

[0089] The polyester dyeing comprises: adding a dispersing leveling agent TF213, acetic acid and a disperse dye in sequence at a constant temperature of 55 to 65° C.; then heating the temperature to 75 to 85° C. at a heating rate of 2.5 to 3.5° C. / min, then heating the temperature to 125 to 135° C. at a heating rate of 1.5 to 2.5° C. / min and keeping the temperature for 40 to 60 minutes; then cooling the temperature to 45 to 50° C. at a cooling rate of 1 to 2° C. / min;

[0090] The cleaning reagent used in the reduction cleaning comprises the following components by mass concentration: reduction cleaning agent N 2.0-3.0 g / L, penetrant M 2.0-3.0 g / L, and acetic acid 0.5-1 g / L;

[0091] The reduction cleaning comprises: heating to 75-85°C at a constant rate of 2.5-3.5°C / min, keeping the temperature for 20-40 minutes, and then cooling to 45-50°C at a cooling rate of 1-2°C / min;

[0092] (2) using a cotton dyeing liquid to perform cotton dyeing on the semi-dyed knitted fabric obtained in step (1), and then performing cotton post-treatment to obtain the dark grey polyester-cotton knitted fabric;

[0093] The cotton dyeing solution comprises the following components by mass concentration: 2-2.5% (owf) of reactive dyes, 20-25 g / L of soda ash, and 80-90 g / L of sodium sulfate; the reactive dyes include yellow, red, blue and black in a mass ratio of 1-1.2:1:1:1;

[0094] The cotton dyeing method comprises: adding active dye, sodium sulfate and soda ash in sequence under a constant temperature of 40-45°C; then heating to 50-55°C at a constant rate of 0.5-1°C / min, keeping the temperature for 50-60min, and then cooling the temperature three times;

[0095] The cotton post-treatment comprises: firstly, washing with 0.5-1 g / L acetic acid at a temperature of 55-65° C. for 10-20 min; then, washing with 1.0-1.5 g / L penetrant M at a temperature of 70-80° C. for 10-20 min; and finally, washing with water at a temperature of 45-55° C.

[0096] The numerical range described in the present invention not only includes the point values ​​listed above, but also includes any point values ​​between the above numerical ranges that are not listed. Due to space limitations and for the sake of simplicity, the present invention no longer exhaustively lists the specific point values ​​included in the range.

[0097] Compared with the prior art, the present invention has the following beneficial effects:

[0098] (1) The present invention greatly shortens the total time consumed in the dyeing process, reduces energy consumption in the dyeing process, improves production efficiency, and saves production costs by selecting a strong and efficient dispersing and leveling agent TF213;

[0099] (2) The dark grey polyester-cotton knitted fabric obtained by the dyeing method provided by the present invention has excellent color stability and fastness. BRIEF DESCRIPTION OF THE DRAWINGS

[0100] Figure 1 This is a process flow chart of the polyester dyeing process and the reduction cleaning process in the rapid dyeing method for dark grey polyester-cotton knitted fabric provided in Example 1 of the present invention. DETAILED DESCRIPTION

[0101] The technical solution of the present invention is further described below by specific implementation methods. It should be understood by those skilled in the art that the embodiments are only to help understand the present invention and should not be regarded as specific limitations of the present invention.

[0102] The production equipment used in the rapid dyeing method described in the following embodiments and comparative examples includes: Lixin overflow dyeing machine and Monfushi open width setting machine; the testing instruments used include: Datacolor SF600X colorimeter, UV1102 ultraviolet spectrophotometer and Y571B friction fastness tester;

[0103] The disperse yellow used was disperse yellow S-2R%, the disperse dark blue was disperse dark blue NP-2%, and the disperse bright red was disperse bright red LSF%, all of which were selected from Zhejiang Longsheng Group Co., Ltd.;

[0104] The yellow, red, blue and black are all selected from Dyestar Dye Company;

[0105] The penetrant M, dispersing and leveling agent TF, and reducing cleaning agent N are all selected from Transfar Chemical Group Co., Ltd.

[0106] Example 1

[0107] This embodiment provides a method for rapid dyeing of dark grey polyester-cotton knitted fabric, the method comprising the following steps:

[0108] (1) Pre-treating the polyester-cotton knitted fabric, and then using a polyester dyeing solution to treat the polyester-cotton knitted fabric. Figure 1 The polyester dyeing shown is followed by reduction cleaning and secondary drainage to obtain a semi-dyed knitted fabric;

[0109] The polyester dyeing solution comprises the following components by mass concentration: 2.1% (owf) of disperse dye, 1.0 g / L of disperse leveling agent TF213, and 0.5 g / L of acetic acid; the disperse dye comprises disperse yellow, disperse dark blue and disperse scarlet in a mass ratio of 1:1:1;

[0110] The polyester dyeing comprises: adding dispersed leveling agent TF213, acetic acid and disperse dye in sequence at a constant temperature of 60°C; then heating to 80°C at a heating rate of 3°C / min, then heating to 130°C at a heating rate of 2°C / min and keeping the temperature for 50 minutes; then cooling to 50°C at a cooling rate of 1.5°C / min;

[0111] The cleaning reagent used in the reduction cleaning comprises the following components by mass concentration: reduction cleaning agent N 2.0 g / L, penetrant M 2.0 g / L, and acetic acid 0.5 g / L;

[0112] The reduction cleaning comprises: heating to 80°C at a constant rate of 3.0°C / min, keeping the temperature for 30 minutes, and then cooling to 50°C at a cooling rate of 1.0°C / min;

[0113] (2) using a cotton dyeing liquid to perform cotton dyeing on the semi-dyed knitted fabric obtained in step (1), and then performing cotton post-treatment to obtain the dark grey polyester-cotton knitted fabric;

[0114] The cotton dyeing solution comprises the following components by mass concentration: 2-2.5% (owf) of reactive dyes, 20 g / L of soda ash, and 80 g / L of sodium sulfate; the reactive dyes include yellow, red, blue and black in a mass ratio of 1.2:1:1:1;

[0115] The cotton dyeing method comprises: adding active dye, sodium sulfate and soda ash in sequence under a constant temperature of 43°C; then heating to 50°C at a constant rate of 0.5°C / min, keeping the temperature for 60 minutes and then cooling the temperature three times;

[0116] The cotton post-treatment includes: firstly, washing with 0.5g / L acetic acid at a temperature of 50°C for 10 minutes; then, washing with a penetrant M at a concentration of 1.0g / L at a temperature of 80°C for 10 minutes; and then, washing twice at a temperature of 50°C, each washing time being 10 minutes.

[0117] Example 2

[0118] This embodiment provides a method for rapid dyeing of dark grey polyester-cotton knitted fabric, the method comprising the following steps:

[0119] (1) pre-treating a polyester-cotton knitted fabric, and then using a polyester dyeing solution to perform polyester dyeing on the polyester-cotton knitted fabric, and after primary drainage, performing reduction cleaning and secondary drainage in sequence to obtain a semi-dyed knitted fabric;

[0120] The polyester dyeing solution comprises the following components by mass concentration: 2.3% (owf) disperse dye, 2.0 g / L disperse leveling agent TF213, and 1.5 g / L acetic acid; the disperse dye comprises disperse yellow, disperse dark blue and disperse scarlet in a mass ratio of 1:1:1.1;

[0121] The polyester dyeing comprises: adding a dispersing leveling agent TF213, acetic acid and a disperse dye in sequence at a constant temperature of 55°C; then heating the temperature to 75°C at a heating rate of 2.5°C / min, then heating the temperature to 125°C at a heating rate of 1.5°C / min and keeping the temperature for 60 minutes; then cooling the temperature to 48°C at a cooling rate of 1°C / min;

[0122] The cleaning reagent used in the reduction cleaning comprises the following components by mass concentration: reduction cleaning agent N 3.0 g / L, penetrant M 3.0 g / L, and acetic acid 1 g / L;

[0123] The reduction cleaning comprises: heating to 75°C at a constant rate of 2.5°C / min, keeping the temperature for 40 minutes, and then cooling to 45°C at a cooling rate of 1.5°C / min;

[0124] (2) using a cotton dyeing liquid to perform cotton dyeing on the semi-dyed knitted fabric obtained in step (1), and then performing cotton post-treatment to obtain the dark grey polyester-cotton knitted fabric;

[0125] The cotton dyeing solution comprises the following components by mass concentration: 2.5% (owf) of reactive dyes, 25 g / L of soda ash, and 90 g / L of sodium sulfate; the reactive dyes include yellow, red, blue and black in a mass ratio of 1.1:1:1:1;

[0126] The cotton dyeing method comprises: adding active dye, sodium sulfate and soda ash in sequence under a constant temperature of 40°C; then heating to 52°C at a constant rate of 0.5°C / min, keeping the temperature for 55 minutes and then cooling the temperature three times;

[0127] The cotton post-treatment includes: firstly, washing with 1g / L acetic acid at a temperature of 55°C for 20 minutes; then, washing with 1.5g / L penetrant M at a temperature of 70°C for 20 minutes; and then, washing twice in a row at a temperature of 45°C, each washing time being 20 minutes.

[0128] Example 3

[0129] This embodiment provides a method for rapid dyeing of dark grey polyester-cotton knitted fabric, the method comprising the following steps:

[0130] (1) pre-treating a polyester-cotton knitted fabric, and then using a polyester dyeing solution to perform polyester dyeing on the polyester-cotton knitted fabric, and after primary drainage, performing reduction cleaning and secondary drainage in sequence to obtain a semi-dyed knitted fabric;

[0131] The polyester dyeing solution comprises the following components by mass concentration: 1.8% (owf) of disperse dye, 1.5 g / L of disperse leveling agent TF213, and 1 g / L of acetic acid; the disperse dye comprises disperse yellow, disperse dark blue, and disperse scarlet in a mass ratio of 1:1:0.9;

[0132] The polyester dyeing comprises: adding a dispersing leveling agent TF213, acetic acid and a disperse dye in sequence at a constant temperature of 65°C; then heating to 85°C at a heating rate of 3.5°C / min, then heating to 135°C at a heating rate of 2.5°C / min and keeping the temperature for 40 minutes; then cooling to 45°C at a cooling rate of 2°C / min;

[0133] The cleaning reagent used in the reduction cleaning comprises the following components by mass concentration: reduction cleaning agent N 2.5 g / L, penetrant M 2.5 g / L, and acetic acid 0.75 g / L;

[0134] The reduction cleaning comprises: heating to 85°C at a constant rate of 3.5°C / min, keeping the temperature for 20 minutes, and then cooling to 48°C at a cooling rate of 2°C / min;

[0135] (2) using a cotton dyeing liquid to perform cotton dyeing on the semi-dyed knitted fabric obtained in step (1), and then performing cotton post-treatment to obtain the dark grey polyester-cotton knitted fabric;

[0136] The cotton dyeing solution comprises the following components by mass concentration: 2% (owf) reactive dye, 22.5 g / L soda ash, and 85 g / L sodium sulfate; the reactive dye comprises yellow, red, blue and black in a mass ratio of 1:1:1:1;

[0137] The cotton dyeing method comprises: adding active dye, sodium sulfate and soda ash in sequence under a constant temperature of 45°C; then heating to 55°C at a constant rate of 0.75°C / min, keeping the temperature for 50 minutes and then cooling the temperature three times;

[0138] The cotton post-treatment includes: first, washing with 0.75g / L acetic acid at a heat preservation temperature of 65°C for 15 minutes; then, washing with a penetrant M with a concentration of 1.25g / L at a heat preservation temperature of 75°C for 15 minutes; and then, washing twice in a row at a heat preservation temperature of 55°C, each washing time being 15 minutes.

[0139] Example 4

[0140] This embodiment provides a rapid dyeing method for dark grey polyester-cotton knitted fabric, and the rapid dyeing method is different from that of embodiment 1 only in that:

[0141] In this embodiment, the step rate heating in the polyester dyeing in step (1) is adjusted to: directly heating to 130° C. at a heating rate of 3° C. / min.

[0142] Example 5

[0143] This embodiment provides a rapid dyeing method for dark grey polyester-cotton knitted fabric, and the rapid dyeing method is different from that of embodiment 1 only in that:

[0144] In this embodiment, the step rate heating process in the polyester dyeing in step (1) is adjusted as follows: firstly, the temperature is raised to 100°C at a heating rate of 3°C / min, and then the temperature is raised to 130°C at a heating rate of 0.8°C / min.

[0145] Example 6

[0146] This embodiment provides a rapid dyeing method for dark grey polyester-cotton knitted fabric, and the rapid dyeing method is different from that of embodiment 1 only in that:

[0147] In this embodiment, the heat preservation treatment during polyester dyeing in step (1) is adjusted to: heat preservation treatment at 120° C. for 50 minutes.

[0148] Example 7

[0149] This embodiment provides a rapid dyeing method for dark grey polyester-cotton knitted fabric, and the rapid dyeing method is different from that of embodiment 1 only in that:

[0150] In this embodiment, the heat preservation treatment during polyester dyeing in step (1) is adjusted to: heat preservation treatment at 140° C. for 50 minutes.

[0151] Example 8

[0152] This embodiment provides a rapid dyeing method for dark grey polyester-cotton knitted fabric, and the rapid dyeing method is different from that of embodiment 1 only in that:

[0153] In this embodiment, the content of the dispersing and leveling agent TF213 in the polyester dyeing solution in step (1) is adjusted to 0.5 g / L.

[0154] Example 9

[0155] This embodiment provides a rapid dyeing method for dark grey polyester-cotton knitted fabric, and the rapid dyeing method is different from that of embodiment 1 only in that:

[0156] In this embodiment, the content of the dispersing and leveling agent TF213 in the polyester dyeing solution in step (1) is adjusted to 2.5 g / L.

[0157] Example 10

[0158] This embodiment provides a rapid dyeing method for dark grey polyester-cotton knitted fabric, and the rapid dyeing method is different from that of embodiment 1 only in that:

[0159] In this embodiment, the cleaning reagent used in the reduction cleaning in step (1) is adjusted to: reduction cleaning agent N 2.0 g / L.

[0160] Embodiment 11

[0161] This embodiment provides a rapid dyeing method for dark grey polyester-cotton knitted fabric, and the rapid dyeing method is different from that of embodiment 1 only in that:

[0162] In this embodiment, the order of adding materials at constant temperature in the cotton dyeing in step (2) is adjusted to: sodium sulfate, baking soda, and reactive dye.

[0163] Example 12

[0164] This embodiment provides a rapid dyeing method for dark grey polyester-cotton knitted fabric, and the rapid dyeing method is different from that of embodiment 1 only in that:

[0165] In this embodiment, the order of adding materials at constant temperature in the cotton dyeing in step (2) is adjusted to: reactive dye, baking soda, and sodium sulfate.

[0166] Comparative Example 1

[0167] This comparative example provides a rapid dyeing method for dark grey polyester-cotton knitted fabric, which is different from that of Example 1 only in that:

[0168] In this comparative example, the dispersing and leveling agent TF213 in step (1) is adjusted to leveling agent K.

[0169] Test example

[0170] The total time consumption in the rapid dyeing method of the dark grey polyester-cotton knitted fabric provided in the above embodiment and comparative example was measured respectively, and the obtained polyester-cotton knitted fabric was subjected to the following performance tests, and the results are shown in Table 1:

[0171] (1) Apparent color depth K / S value: The apparent color depth K / S value of the dyed fabric is measured using a Datacolor SF600X computer colorimeter. The larger the K / S value, the darker the color, and the smaller the K / S value, the lighter the color. The fabric to be tested is evenly laid out as a double layer of opaque, and different points are selected for testing at the maximum absorption wavelength. The average value is taken after three tests.

[0172] (2) Dye uptake (F): UV1102 ultraviolet spectrophotometer was used to measure the absorbance of polyester dyeing solution before and after dyeing, and the dye uptake was calculated according to the following formula:

[0173] Dyeing rate = [1-B / (A×n)]×100%;

[0174] Among them, A is the absorbance of the standard dye solution; B is the absorbance of the dye residual solution, and n is the multiple ratio of the standard original dye solution and the dye residual solution test dilution.

[0175] (3) Use Datacolor SF600X colorimeter to test the color uniformity using the 555 color separation method;

[0176] When the result of the 555 color separation method is ≤211, the cloth is judged to be dyed evenly and the dyeing effect is excellent; when the result of the 555 color separation method is ≤422, the cloth is judged to be dyed evenly and the dyeing effect is qualified; when the result of the 555 color separation method is greater than 422, the cloth dyeing is judged to have problems such as dyeing and color difference, and the dyeing effect is unqualified;

[0177] (4) The dry rubbing color fastness and wet rubbing color fastness of the dark grey knitted fabric were tested using a Y571B rubbing color fastness tester.

[0178] Table 1

[0179]

[0180]

[0181] According to Table 1, we can know the following points:

[0182] (1) Comprehensive analysis of the total time consumption data shows that the method provided by the present invention can greatly shorten the dyeing process time, reduce time cost, and improve production efficiency;

[0183] (2) Comprehensive analysis of K / S value, dye uptake and 555 color separation data shows that the method provided by the present invention can improve the dye uptake of the dye, solve the current quality problems of color spots, color spots or horizontality that can only be obtained after sensitive dyeing processing, and the dyeing effect is equivalent to that obtained by the two-bath method, and an ideal dyeing effect is obtained;

[0184] More specifically, a comprehensive analysis of Example 1 and Examples 4-8 shows that the polyester dyeing process of the present invention affects the color fixation of the dye. When the temperature is directly raised to 130°C at a constant rate, the production time will be extended, a temperature rise fault alarm will occur, and the temperature rise timeout will occur (such as Example 4); when the temperature rise step is increased, a temperature rise fault alarm of 100°C will occur, and the temperature rise timeout will occur (such as Example 5); when the temperature of the heat preservation treatment is too low, the color of the obtained product will be too light; conversely, when the temperature of the heat preservation treatment is too high, the elastic tension frame used in the dyeing process will lose its elasticity or even break, thereby affecting the style of the cloth and consuming a lot of time and energy;

[0185] Comprehensive analysis of Example 1, Examples 8-9 and Comparative Example 1 shows that the selection and addition amount of the leveling agent will affect the color depth, color difference and color point of the obtained knitted fabric; when the addition amount of the dispersed leveling agent TF21 is too high, the color of the obtained knitted fabric will be too light, and a dark gray product cannot be obtained; when the addition amount of the dispersed leveling agent TF21 is too low, the obtained knitted fabric will have color difference and color point problems; in addition, when the leveling agent is adjusted to the leveling agent K, the obtained knitted fabric will have color difference and color point problems;

[0186] Comprehensive analysis of Example 1 and Examples 11-12 shows that the order of adding materials during the cotton dyeing process will affect the dyeing effect of the polyester-cotton knitted fabric, and may even cause problems such as dyeing spots and color differences;

[0187] (3) Comprehensive analysis of the fastness data shows that the cotton-polyester knitted fabric obtained by the method provided by the present invention has excellent color stability, and all fastnesses meet the product requirements, with ideal results.

[0188] In summary, the water flow dyeing machine provided by the present invention, combined with the strong and efficient dispersing and leveling agent TF213, can accelerate the heating rate of polyester dyeing and shorten the insulation time of the polyester dyeing process, thereby greatly shortening the total time consumed in the dyeing process. In addition, the color stability and fastness of the dark gray polyester-cotton knitted fabric obtained by the method provided by the present invention are comparable to those of the traditional dyeing process.

[0189] The applicant declares that the above is only a specific implementation mode of the present invention, but the protection scope of the present invention is not limited thereto. Those skilled in the art should understand that any changes or substitutions that can be easily thought of by those skilled in the art within the technical scope disclosed by the present invention shall fall within the protection scope and disclosure scope of the present invention.

Claims

1. A method for rapid dyeing of dark grey polyester-cotton knitted fabric, characterized in that: The rapid dyeing method comprises the following steps: (1) pre-treating a polyester-cotton knitted fabric, and then using a polyester dyeing solution to perform polyester dyeing on the polyester-cotton knitted fabric, and after primary drainage, performing reduction cleaning and secondary drainage in sequence to obtain a semi-dyed knitted fabric; The polyester dyeing solution includes a dispersing and leveling agent TF213; (2) using cotton dyeing liquid to dye the semi-dyed knitted fabric obtained in step (1), and then performing cotton post-treatment to obtain the dark grey polyester-cotton knitted fabric.

2. The rapid dyeing method according to claim 1, characterized in that: The cotton content of the polyester-cotton knitted fabric is 50-55wt%.

3. The rapid dyeing method according to claim 1, characterized in that: In step (1), the polyester dyeing solution comprises the following components by mass concentration: 1.8-2.3% (owf) of disperse dye, 1.0-2.0 g / L of dispersing leveling agent TF213, and 0.5-1.5 g / L of acetic acid; Preferably, the disperse dyes include disperse yellow, disperse dark blue and disperse red; Preferably, the mass ratio of the disperse yellow, disperse dark blue and disperse bright red is 1:1:0.9-1.

1.

4. The rapid dyeing method according to claim 3, characterized in that: The polyester dyeing in step (1) includes constant temperature feeding, step rate heating, heat preservation treatment and one cooling treatment in sequence; Preferably, the temperature of the constant temperature feeding is 55-65°C; Preferably, dispersing and leveling agent TF213, acetic acid and disperse dye are sequentially added to the constant temperature feeding; Preferably, the step rate heating includes a first heating and a second heating performed sequentially; Preferably, the first heating rate is 2.5-3.5°C / min; Preferably, the end temperature of the first heating is 75-85°C; Preferably, the second heating rate is 1.5-2.5°C / min; Preferably, the temperature of the heat preservation treatment is 125-135°C; Preferably, the heat preservation treatment time is 40 to 60 minutes; Preferably, the cooling rate of the first cooling treatment is 1-2°C / min; Preferably, the terminal temperature of the first cooling treatment is 45-50°C.

5. The rapid dyeing method according to any one of claims 1 to 4, characterized in that: In the polyester dyeing of step (1), the solid-to-liquid ratio of the polyester-cotton knitted fabric to the polyester dyeing solution is 1:4.5-5.

5.

6. The rapid dyeing method according to any one of claims 1 to 5, characterized in that: The reduction cleaning in step (1) comprises: heating to a cleaning temperature at a constant rate, maintaining the temperature for cleaning, and performing a secondary cooling treatment after the cleaning; Preferably, the cleaning reagent used in the reduction cleaning comprises the following components by mass concentration: reduction cleaning agent N 2.0-3.0 g / L, penetrant M 2.0-3.0 g / L, and acetic acid 0.5-1 g / L; Preferably, the heating rate in the constant rate heating is 2.5-3.5°C / min; Preferably, acetic acid, penetrant M and reducing cleaning agent N are added in sequence during the constant rate heating; Preferably, the heat preservation and cleaning temperature is 75-85°C; Preferably, the reduction cleaning time is 20 to 40 minutes; Preferably, the cooling rate of the secondary cooling treatment is 1-2°C / min; Preferably, the cooling end point of the cooling treatment is 45-50°C.

7. The rapid dyeing method according to any one of claims 1 to 6, characterized in that: The cotton dyeing solution in step (2) comprises the following components by mass concentration: 2-2.5% (owf) of reactive dye, 20-25 g / L of soda ash, and 80-90 g / L of sodium sulfate; Preferably, the reactive dyes include yellow, red, blue and black; Preferably, the mass ratio of yellow, red, blue and black is 1-1.2:1:1:

1.

8. The rapid dyeing method according to claim 7, characterized in that: The cotton dyeing in step (2) includes constant temperature feeding, constant rate heating, heat preservation treatment and three cooling treatments in sequence; Preferably, the temperature of the constant temperature feeding is 40-45°C; Preferably, active dye, sodium sulfate and baking soda are added in sequence to the constant temperature feeding; Preferably, the constant rate heating rate is 0.5-1°C / min; Preferably, the temperature of the heat preservation treatment is 50-55°C; Preferably, the heat preservation treatment time is 50 to 60 minutes.

9. The rapid dyeing method according to any one of claims 1 to 8, characterized in that: The cotton post-treatment in step (2) includes acetic acid cleaning, penetrant cleaning and water cleaning in sequence; Preferably, the insulation temperature of the acetic acid cleaning is 55-65°C; Preferably, the acetic acid cleaning holding time is 10 to 20 minutes; Preferably, the concentration of acetic acid used in the acetic acid cleaning is 0.5 to 1 g / L; Preferably, the holding temperature of the penetrant cleaning is 70-80°C; Preferably, the holding time of the penetrant cleaning is 10 to 20 minutes; Preferably, the concentration of the penetrant M used in the penetrant cleaning is 1.0 to 1.5 g / L; Preferably, the water washing insulation temperature is 45-55°C; Preferably, the water washing insulation time is 5 to 15 minutes.

10. The rapid dyeing method according to any one of claims 1 to 9, characterized in that: The rapid dyeing method comprises the following steps: (1) pre-treating a polyester-cotton knitted fabric, and then using a polyester dyeing solution to perform polyester dyeing on the polyester-cotton knitted fabric, and after primary drainage, performing reduction cleaning and secondary drainage in sequence to obtain a semi-dyed knitted fabric; The polyester dyeing solution comprises the following components by mass concentration: 1.8-2.3% (owf) of disperse dye, 1.0-2.0 g / L of disperse leveling agent TF213, and 0.5-1.5 g / L of acetic acid; the disperse dye comprises disperse yellow, disperse dark blue and disperse scarlet in a mass ratio of 1:1:0.9-1.1; The polyester dyeing comprises: adding a dispersing leveling agent TF213, acetic acid and a disperse dye in sequence at a constant temperature of 55 to 65° C.; then heating the temperature to 75 to 85° C. at a heating rate of 2.5 to 3.5° C. / min, then heating the temperature to 125 to 135° C. at a heating rate of 1.5 to 2.5° C. / min and keeping the temperature for 40 to 60 minutes; then cooling the temperature to 45 to 50° C. at a cooling rate of 1 to 2° C. / min; The cleaning reagent used in the reduction cleaning comprises the following components by mass concentration: reduction cleaning agent N 2.0-3.0 g / L, penetrant M 2.0-3.0 g / L, and acetic acid 0.5-1 g / L; The reduction cleaning comprises: heating to 75-85°C at a constant rate of 2.5-3.5°C / min, keeping the temperature for 20-40 minutes, and then cooling to 45-50°C at a cooling rate of 1-2°C / min; (2) using a cotton dyeing liquid to perform cotton dyeing on the semi-dyed knitted fabric obtained in step (1), and then performing cotton post-treatment to obtain the dark grey polyester-cotton knitted fabric; The cotton dyeing solution comprises the following components by mass concentration: 2-2.5% (owf) of reactive dyes, 20-25 g / L of soda ash, and 80-90 g / L of sodium sulfate; the reactive dyes include yellow, red, blue and black in a mass ratio of 1-1.2:1:1:1; The cotton dyeing method comprises: adding active dye, sodium sulfate and soda ash in sequence under a constant temperature of 40-45°C; then heating to 50-55°C at a constant rate of 0.5-1°C / min, keeping the temperature for 50-60min, and then cooling the temperature three times; The cotton post-treatment comprises: firstly, washing with 0.5-1 g / L acetic acid at a temperature of 55-65° C. for 10-20 min; then, washing with 1.0-1.5 g / L penetrant M at a temperature of 70-80° C. for 10-20 min; and finally, washing with water at a temperature of 45-55° C.

Images