Reactive dye dark red dyeing process for wool

Abstract

The invention discloses a dark red dyeing process of a reactive dye for wool, which comprises the following steps: step 1, placing a to-be-dyed wire harness in a dye vat, and carrying out preheating treatment; 2, sequentially adding a penetrating defoaming agent, a dyeing accelerant and formic acid into the preheated dye vat to form a reaction solution; step 3, adding reactive dye into the reaction liquid, operating, heating the reaction liquid to a first reaction temperature at a temperature rise speed of 2 DEG C per minute, and keeping the temperature; 4, cooling the reaction liquid to a second reaction temperature, and adding ammonia water for operation; step 5, discharging the dye liquor in the dye vat, performing water washing treatment, heating to a second reaction temperature after water washing, and then adding sodium dithionite into the dye vat; 6, draining the dye vat, and sequentially carrying out hot water washing treatment, cold water washing treatment and acid washing treatment; and step 7, rewinding the wire harness subjected to acid pickling treatment, and then dehydrating and drying the wire harness. The dye and the auxiliary agent used in the invention are environment-friendly, and the dyed product does not contain heavy metals; compared with a traditional dyeing process, the dyeing process is more convenient to operate, higher in operability, higher in color fastness, reliable in indexes such as soaping fastness and the like.

Description

Technical Field

[0001] The invention relates to the field of dyeing technology, in particular to a wool dyeing technology with deep red reactive dyes. Background Art

[0002] Traditionally, acid, neutral, wool-use active or mordant dyes are used to dye dark red wool and cashmere products. However, due to the low fastness of acid dyes, they are only suitable for dyeing light and medium colors. Neutral dyes contain heavy metals, which are difficult to meet the requirements of products without heavy metals. Mordant dyes must be treated with sodium dichromate, which is not environmentally friendly and has application limitations. In order to ensure that the fastness meets the standard and is environmentally friendly, wool-use active dyes are generally used for dark red dyeing. Due to the limitations of the structure of wool-use active dyes, their dyeing and fixation rates can only reach 95-98%. After dyeing, a certain amount of residual unreacted hydrolyzed dyes and dyeing auxiliaries are still adsorbed in the residual bath of dye and on cashmere fibers. In order to ensure that the color fastness of the dyed products meets the standard, alkali washing and color fixing treatment must be carried out after dyeing to ensure that the unreacted hydrolyzed dyes are completely removed from the fiber surface. Generally, dark or extra-dark colors must undergo 2 alkali washing and color fixing treatments before the color fastness meets the standard. The residual liquid of the dye bath after alkali washing has a darker color. Dark colors need to be washed 8-10 times with cold and hot water alternately to wash off the unreacted and hydrolyzed dye adsorbed on the fiber surface, which makes the process complicated, wastes water resources and produces a lot of waste liquid. Summary of the invention

[0003] The technical problem to be solved by the present invention is to provide a wool dyeing process with dark red reactive dyes which is simple in process, reliable in dyeing and relatively environmentally friendly. In order to solve the above technical problems, the present invention is solved by the following technical scheme: a wool dyeing process with reactive dyes in dark red, comprising the following steps: Step 1: Place the yarn to be dyed in the dyeing vat and preheat it; Step 2: adding a penetrating defoamer, a dyeing accelerator and formic acid into the preheated dye vat in sequence to form a reaction solution; Step 3: Add active dye into the reaction solution and operate, and heat the reaction solution to the first reaction temperature at a temperature rise rate of 2 degrees per minute and maintain it; Step 4, cooling the reaction solution to the second reaction temperature, adding ammonia water and running; Step 5, after the dyeing liquid in the dyeing vat is discharged, it is washed with water, after washing, the temperature is raised to the second reaction temperature, and then sodium dithionite is added into the dyeing vat; Step 6, draining the dye vat and sequentially performing hot water washing, cold water washing and acid washing; Step 7: After pickling, the wire harness is reeled and dehydrated and dried.

[0004] Preferably, the preheating treatment in step 1 is as follows: heating the dye vat and placing the yarn bundle to be dyed in an environment of 30 degrees for heat preservation.

[0005] Preferably, the specific order of step 2 is: A1. Add 0.5% penetrating defoamer into the dye vat and let it react for 5 minutes; A2. Add 32% dye accelerator into the dye vat and let it react for 5 minutes; A3. Add 3.5% formic acid into the dye vat and run the reaction for 5 minutes.

[0006] Preferably, the first reaction temperature in step three is 90° C., and the temperature is maintained for 90 minutes after being heated to the first reaction temperature.

[0007] Preferably, in step 4, 5.5% ammonia water is added into the dye vat and kept warm for 20 minutes, and the second reaction temperature is 80 degrees.

[0008] Preferably, the sodium dithionite is added and maintained for 30 minutes.

[0009] Preferably, step six is ​​specifically as follows: B1. Hot water washing: The dyed yarns are bathed in 70-degree hot water, cooled to 30 degrees after 10 minutes, and the cycle is repeated three times; B2. Cold water washing: The wire harness treated with hot water in step B1 is bathed in cold water for 10 minutes, and the cycle is repeated twice; B3. Pickling treatment: Add 1% acetic acid to the dye vat after the cold water bath in step B2 and pickle for 10 minutes.

[0010] Preferably, the pH value of the reaction solution in step 2 is 3.5-3.8.

[0011] Preferably, in step 4, ammonia water is added to adjust the pH in the dye vat to 8.5-9.

[0012] Compared with the prior art, the present invention has the following beneficial effects: (1) The dyes / auxiliaries used in the present invention are all environmentally friendly, and the dyed products do not contain heavy metals, 24 aromatic amines, phosphorus, NPEO and other environmentally unfriendly substances.

[0013] (2) Compared with the traditional dyeing process, this dyeing process is more convenient and more operable, and the dye auxiliaries used can meet the needs of the automated conveying system, which is convenient for subsequent automated processing. The traditional process requires 8-10 washing times, while the present invention saves 30-40% of water, shortens the dyeing time by more than 90 minutes, and saves costs.

[0014] (3) The fastness indexes of the product after dyeing of the present invention are better than those of the conventional dyeing process, and the physical indexes such as feel / strength are equivalent to those of the conventional dyeing process. The soap fastness (50°C ISO105 C02) can reach level 4 or above, the alkali sweat fastness (ISO105 E04) can reach level 4 or above, and the rubbing fastness (ISO 105 X12) can reach level 4 or above. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings required for use in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0016] Figure 1 It is a process diagram of the dyeing process of the present invention; Figure 2 The schematic diagram of the irreversible covalent bond produced by the reactive dye and the limiting reaction of the present invention. DETAILED DESCRIPTION

[0017] The present invention is further described in detail below with reference to the accompanying drawings.

[0018] The following description is used to disclose the present invention so that those skilled in the art can implement the present invention. The preferred embodiments described below are only examples, and those skilled in the art can think of other obvious variations. The basic principles of the present invention defined in the following description can be used for other embodiments, variations, improvements, equivalents, and other technical solutions that do not deviate from the spirit and scope of the present invention.

[0019] Those skilled in the art should understand that, in the disclosure of the present invention, the directions or positions indicated by the terms "longitudinal", "lateral", "up", "down", "left", "right", "front", "back", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc. are based on the directions or positional relationships shown in the accompanying drawings, which are only simplified descriptions for the convenience of describing the present invention, and do not indicate or imply that the device or component referred to must have a specific direction, be constructed and operated in a specific direction. Therefore, the above terms should not be understood as limitations on the present invention.

[0020] A wool dyeing process with a dark red reactive dye comprises the following steps: Step 1: Place the yarn to be dyed in a dye vat and perform preheating treatment, that is, heat the dye vat, place the yarn to be dyed in a 30 degree environment and keep it warm; Step 2: Add a penetrating defoamer, a dyeing accelerator and formic acid to the preheated dye vat in sequence to form a reaction solution; specifically, first add 0.5% of the penetrating defoamer to the dye vat and run the reaction for 5 minutes; then add 32% of the dyeing accelerator to the dye vat and run the reaction for 5 minutes; finally, add 3.5% of formic acid to the dye vat until the pH value of the reaction solution is 3.5-3.8, and run the reaction for 5 minutes; Step 3: Add active dye to the reaction liquid and run it, and heat the reaction liquid to the first reaction temperature at a temperature rise rate of 2 degrees per minute, and keep it for 90 minutes after heating to the first reaction temperature. The first reaction temperature is 90°C; Step 4: Cool the reaction solution to the second reaction temperature, add 5.5% ammonia water into the dye vat, adjust the pH value in the dye vat to 8.5-9, and keep warm for 20 minutes. The second reaction temperature is 80 degrees. Step 5: Drain the dye solution in the dye vat and wash it with water. After washing, heat it to the second reaction temperature, then add sodium dithionite into the dye vat and keep it warm for 30 minutes.

[0021] Step 6: Drain the dye vat and perform hot water washing, cold water washing and pickling treatment in sequence; specifically: B1, hot water washing: bathe the dyed wire bundle in 70-degree hot water, cool to 30 degrees after 10 minutes, and repeat the cycle three times; B2, cold water washing: bathe the wire bundle treated with hot water in step B1 with cold water for 10 minutes, and repeat the cycle twice; B3, pickling treatment: add 1% acetic acid to the dye vat after the cold water bath in step B2, and pickle for 10 minutes; Step 7: After pickling, the wire harness is reeled and dehydrated and dried.

[0022] The dyeing process adopted by the present invention has a shorter overall time and is more reliable. The process diagram is shown in the attached figure. Figure 1 The benefits of adopting the technical solution of the present invention are: (1) The dyes / auxiliaries used in the present invention are all environmentally friendly, and the dyed products do not contain heavy metals, 24 aromatic amines, phosphorus, NPEO and other environmentally unfriendly substances; (2) Compared with the traditional dyeing process, this dyeing process is more convenient and more operable, and the dye auxiliaries used can meet the needs of the automated conveying system, which is convenient for subsequent automated processing. The traditional process requires 8-10 washing times, while the present invention can achieve a deep water saving of 30-40%, shorten the dyeing time by more than 90 minutes, and save costs; (3) The fastness indexes of the product after dyeing of the present invention are better than those of the conventional dyeing process, and the physical indexes such as feel / strength are equivalent to those of the conventional dyeing process. The soap fastness (50°C ISO105 C02) can reach level 4 or above, the alkali sweat fastness (ISO105 E04) can reach level 4 or above, and the rubbing fastness (ISO 105 X12) can reach level 4 or above.

[0023] The reactive dyes used in the present invention are LANASOL series dyes, which can react chemically with the amino groups, carboxylic acid groups and other groups in cashmere and wool fibers to form stable irreversible covalent bonds. Figure 2 As shown. The dyeing accelerator used is low-temperature dyeing accelerator SB3, which is an auxiliary agent for low-temperature dyeing of wool with reactive dyes. This auxiliary agent can reduce the dyeing temperature from 98°C to 90°C or below 90°C, better protecting wool fibers from damage caused by long-term exposure to high temperatures.

[0024] For comparison, the following scheme is the existing conventional dyeing process of Lanasu dye. The specific process is: dyeing at 30°C in the dye vat, adding 0.5% of Abaige FFA, and running for 5 minutes. Then add 2% of Abaige B and run for 5 minutes. Add 2% formic acid and adjust the pH value to 3.8-4 and run for 5 minutes, add dye, run for 10 minutes and heat to 98°C, and keep warm for 90 minutes. After draining the dye vat, water is added and heated to 80°C, 3.5% ammonia water is added, the pH value is adjusted to 7.5-8, and the liquid is drained after keeping warm for 20 minutes. Wash once, heat the water inlet to 80°C, add 2.5% ammonia water, adjust the pH value to 8.5, add 1% anti-staining soap detergent ART XD-18, 1% of Yanliyun DMA, keep warm for 20 minutes, and drain. Hot wash at 70℃ for 5 times, 10 minutes each time, cold wash for 2 times, 10 minutes each time, add 1% acetic acid, pickle for 10 minutes, remove from the tank, dehydrate, and dry.

[0025] The conventional process of Lana dyeing deep red generally requires two 80℃ alkaline washes for color fixation, five 70℃ hot washes, three cold water washes, and one acid wash. The dye bath is repeatedly heated and washed with hot and cold water, and the water needs to be changed 10 times, which causes increased damage to the dyed fibers. Dyeing with conventional dyeing technology has the problem of too long post-dyeing treatment time, which leads to increased heat and electricity consumption in the washing process, and at the same time causes high energy consumption, large wastewater discharge, low production efficiency, low dyeing output and other problems. There are also problems such as heavy floating color when washing the garments and easy contamination of intermediate color products.

[0026] Those skilled in the art should understand that the embodiments of the present invention described above and shown in the accompanying drawings are only examples and do not limit the present invention. The purpose of the present invention has been fully and effectively achieved. The functions and structural principles of the present invention have been demonstrated and explained in the embodiments, and the embodiments of the present invention may be deformed or modified in any way without departing from the principles.

Claims

1. A wool dyeing process with a dark red reactive dye, characterized in that: The following steps are involved: Step 1: Place the yarn to be dyed in the dyeing vat and preheat it; Step 2: adding a penetrating defoamer, a dyeing accelerator and formic acid into the preheated dye vat in sequence to form a reaction solution; Step 3: Add active dye into the reaction solution and operate, and heat the reaction solution to the first reaction temperature at a temperature rise rate of 2 degrees per minute and maintain it; Step 4, cooling the reaction solution to the second reaction temperature, adding ammonia water and running the reaction solution; Step 5, after the dyeing liquid in the dyeing vat is discharged, it is washed with water, after washing, the temperature is raised to the second reaction temperature, and then sodium dithionite is added into the dyeing vat; Step 6, draining the dye vat and sequentially performing hot water washing, cold water washing and acid washing; Step 7: After pickling, the wire harness is reeled and dehydrated and dried.

2. A wool dyeing process with active dyes in dark red color according to claim 1, characterized in that: The preheating treatment in step one is: heating the dye vat and placing the strands to be dyed in a 30 degree environment for heat preservation.

3. A wool dyeing process with active dyes in dark red color according to claim 1, characterized in that: The specific sequence of step 2 is: A1. Add 0.5% penetrating defoamer into the dye vat and let it react for 5 minutes; A2. Add 32% dye accelerator into the dye vat and let it react for 5 minutes; A3. Add 3.5% formic acid into the dye vat and run the reaction for 5 minutes.

4. A wool dyeing process with active dyes in dark red color according to claim 1, characterized in that: The first reaction temperature in step 3 is 90° C., and the temperature is maintained for 90 minutes after heating to the first reaction temperature.

5. A wool dyeing process with active dyes in dark red color according to claim 1, characterized in that: Step 4: Add 5.5% ammonia water into the dye vat and keep warm for 20 minutes. The second reaction temperature is 80 degrees.

6. A wool dyeing process with active dyes in dark red color according to claim 5, characterized in that: Sodium dithionite was added and maintained for 30 minutes.

7. A wool dyeing process with active dyes in dark red color according to claim 1, characterized in that: The details of step six are as follows: B1. Hot water washing: The dyed yarns are bathed in 70-degree hot water, cooled to 30 degrees after 10 minutes, and the cycle is repeated three times; B2. Cold water washing: The wire harness treated with hot water in step B1 is bathed in cold water for 10 minutes, and the cycle is repeated twice; B3. Pickling treatment: Add 1% acetic acid to the dye vat after the cold water bath in step B2 and pickle for 10 minutes.

8. A wool dyeing process with active dyes in dark red color according to claim 1, characterized in that: The pH value of the reaction solution in step 2 is 3.5-3.

8.

9. A wool dyeing process with active dyes in dark red color according to claim 1, characterized in that: In step 4, ammonia water is added to adjust the pH in the dye vat to 8.5-9.

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