Dyeing method of chinlon-spandex fabric with high spandex content

Abstract

The invention relates to the technical field of finishing and dyeing of fabrics, in particular to a dyeing method of a nylon-spandex fabric with high spandex content. The dyeing method comprises the following steps: sequentially carrying out an open-width oil removal process, an in-cylinder oil removal process, a presetting process, a pre-dyeing oil removal process, a hot water washing process and a dyeing process. According to the dyeing method, the textile oiling agent on the brocade spandex fabric is fully removed through three times of oil removal, and the problem of oil bloom is avoided. Wherein in the open-width oil removal process, a textile oil agent on a fabric is preliminarily removed, and a cloth cover is flat and shrunk to avoid cloth cover creases caused by excessive shrinkage in the in-cylinder oil removal process; and the spinning oil agent is thoroughly removed through the procedures of oil removal in the cylinder and oil removal before dyeing.

Description

Technical Field

[0001] The invention relates to the technical field of finishing and dyeing of fabrics, and in particular to a dyeing method for nylon-spandex fabrics with high spandex content. Background Art

[0002] Nylon-spandex fabrics are widely used in various footwear and clothing materials due to their excellent durability and good elasticity. However, a large amount of textile oil must be added to the spandex during the weaving process for lubrication and anti-static purposes, and the textile oil must be fully removed during dyeing and finishing. Insufficient removal can easily lead to uneven dyeing and oil spots. Nylon-spandex fabrics with high spandex content are particularly serious in this regard.

[0003] The dyeing mechanism of nylon is as follows: nylon contains amino groups, which are ionized under acidic conditions and adsorbed and combined with negatively charged acid dyes to complete dyeing. The glass transition temperature of nylon material is 40~50℃, which is relatively low. The dye can quickly diffuse into the fiber at room temperature. According to the Chinese invention patent with publication number CN117106530A, dyeing factories mostly use flat-width refining and degreasing or refining and degreasing by overflow of dyeing vats after flattening for degreasing.

[0004] Open width degreasing uses open width degreasing equipment for pre-treatment, which can remove the oil on the fabric surface in the open width state to prevent the textile oil on the fabric surface from affecting the dyeing process. However, open width degreasing is a continuous production equipment, which has the advantages of being fast and efficient. The fabric stays in the equipment for a short time and cannot be fully degreased.

[0005] Degreasing in the vat can effectively remove the oil on the fabric, but the fabric is in a rope-like state in the dye vat. Spandex shrinks violently when heated without being pre-set, so nylon-spandex fabric will be severely creased if it is directly refined in the vat without being pre-set. If the grey fabric is degreasing in the vat after being pre-set, the textile oil will be cross-linked and aggregated under high temperature conditions and cannot be removed. In addition, the oil content of the fabric is different during the high-temperature setting process, so the temperature received by the fabric is different, which is prone to oxidation, resulting in inconsistent color absorption of the fabric and color problems. Summary of the invention

[0006] The technical problem to be solved by the present invention is to provide a dyeing method for nylon-spandex fabrics with high spandex content which is completely degreased.

[0007] In order to solve the above technical problems, the technical solution adopted by the present invention is: a dyeing method for nylon-spandex fabrics with high spandex content, comprising the following steps: performing an open-width degreasing process, an in-cylinder degreasing process, a predetermined process, a pre-dyeing degreasing process, a hot water washing process and a dyeing process in sequence.

[0008] The beneficial effect of the present invention is that the dyeing method of the present invention fully removes the textile oil on the nylon-spandex fabric through three degreasing processes to avoid the problem of oil spots. The flat-width degreasing process preliminarily removes the textile oil on the fabric and makes the fabric shrink flat to avoid creases on the fabric due to excessive shrinkage during the in-tank degreasing process; and the in-tank degreasing process and the pre-dyeing degreasing process completely remove the textile oil. DETAILED DESCRIPTION

[0009] In order to explain the technical content, achieved objectives and effects of the present invention in detail, the following is an explanation in conjunction with the implementation modes.

[0010] A dyeing method for nylon-spandex fabrics with high spandex content comprises the following steps: sequentially carrying out an open width degreasing process, an in-tank degreasing process, a predetermined process, a pre-dyeing degreasing process, a hot water washing process and a dyeing process.

[0011] From the above description, it can be seen that the beneficial effects of the present invention are as follows: the dyeing method of the present invention first performs open-width degreasing on the fabric, and plays the role of open-width pre-shrinkage while degreasing, so as to avoid creases due to excessive shrinkage of the fabric during degreasing in the cylinder; then, degreasing in the cylinder, pre-degreasing and degreasing before dyeing are performed in sequence, and the fabric after three degreasings can completely remove the textile oil on the nylon-spandex fabric, so as to avoid oil stains caused by oil stains during the dyeing process. The present invention sets the pre-degreasing process after two degreasings and before the third degreasing, at which time there is less oil on the fabric, and it is not easy to cause cross-linking due to high temperature to cause color spots, and it can also reduce creases caused by dyeing, greatly improving the quality of the fabric after dyeing.

[0012] Furthermore, the method also includes a cloth sorting process performed before the open width oil removal process.

[0013] Furthermore, 3-5 g / L of a neutral degreasing agent is added during the flat width degreasing process.

[0014] From the above description, it can be seen that since the flat-width degreasing process is a continuous process with a short action time, it is necessary to increase the amount of neutral degreasing agent to improve the degreasing effect.

[0015] Furthermore, the temperature of the flat width degreasing process is 80-90°C and the machine speed is 15-20 m / min.

[0016] From the above description, it can be seen that the flat width degreasing process adopts a relatively low temperature to avoid cross-linking of the oil agent due to high temperature.

[0017] Furthermore, 1-2 g / L of a neutral degreasing agent is added during the in-cylinder degreasing process.

[0018] From the above description, it can be seen that since the subsequent predetermined processes are carried out under high temperature conditions, acidic or alkaline conditions on the cloth surface will damage the material. Therefore, the flat-width degreasing process and the in-cylinder degreasing process are both carried out under neutral conditions and a neutral degreasing agent is added.

[0019] Furthermore, the degreasing temperature of the in-cylinder degreasing process is 50-55°C, and the degreasing time is 20-30 minutes.

[0020] From the above description, it can be seen that a lower temperature is used when degreasing in the cylinder to prevent unpredicted nylon-spandex fabrics from excessive shrinkage and creases when degreasing in the cylinder.

[0021] Furthermore, 3 to 5 g / L of antioxidant is added in the predetermined process.

[0022] From the above description, it can be seen that adding antioxidants in the predetermined process can reduce the inconsistency of the color absorption of the fabric caused by oxidation.

[0023] Furthermore, the predetermined process temperature is 190-195° C. and the vehicle speed is 15-20 m / min.

[0024] From the above description, it can be seen that high temperature can avoid creases on the cloth caused by dyeing.

[0025] Furthermore, 2-3 g / L of degreasing agent and 1-1.5 g / L of soda ash are added in the degreasing process before dyeing.

[0026] From the above description, it can be seen that adding soda ash during the degreasing process before dyeing can enhance the degreasing effect.

[0027] Furthermore, the degreasing temperature of the degreasing process before dyeing is 80-90°C, and the degreasing time is 15-25 minutes.

[0028] Furthermore, the temperature of the hot water washing process is 75~85℃ and the humidity is 15~25℃.

[0029] From the above description, it can be seen that after three degreasing treatments, the cloth surface is in an alkaline state. At this time, hot water washing is performed without acid neutralization. Hot water washing can wash away the residual alkali agent and control the pH environment of the cloth surface at 8~9, thereby avoiding the inability to dye the dye due to excessive alkalinity and avoiding the formation of color spots in the initial dyeing stage due to acid neutralization.

[0030] Furthermore, the dyeing process is specifically as follows: the fabric that has undergone the pre-dyeing degreasing process is put into a vat, cold water is added, an acid leveling agent, a dye and an acid-releasing agent are added in sequence, and then the temperature is raised to perform dyeing; the dye includes an acid fluorescent yellow dye and an acid turquoise blue dye.

[0031] Among them, cold water is water at room temperature, with a temperature range of 20~35℃.

[0032] From the above description, it can be seen that the current conventional dyeing process uses acetic acid to provide the acidic conditions required for dyeing. The pH of acetic acid is relatively low, only 3.0~3.5. As the dyeing progresses, the continuous consumption of acetic acid will cause the pH to gradually increase. The two dyes, acid turquoise and acid fluorescent yellow, are very easy to dye fibers. Among them, acid turquoise has a great affinity for nylon fibers, and it is very easy to cause sudden dyeing in the early stage of dyeing, resulting in color fringing. The dyeing rate needs to be strictly controlled in the early stage of dyeing, and a higher pH is required. Sufficient acid is needed to provide hydrogen ions in the later stage of dyeing to ensure the full combination of the dye and the nylon fiber. The dyeing environment provided by acetic acid is inconsistent with the environment required for nylon turquoise dyeing, which is very likely to cause color fringing problems.

[0033] The dyeing method of the present invention controls the pH value of the cloth surface before dyeing to be 8-9 by alkaline degreasing and hot washing before dyeing, thereby avoiding color spots in the initial dyeing stage; cold water is introduced during dyeing to control the initial dyeing temperature to be relatively low, and the dyeing rate can be further adjusted to avoid the sudden dyeing in the initial dyeing stage; an acid-releasing agent is used to replace acetic acid during dyeing to slowly release acid, so that the pH value of the dye solution is slowly reduced and the pH value is controlled to be between 4 and 5 at the end of dyeing, so that the required dyeing environment can still be provided for nylon turquoise dyeing in the later stage of dyeing, thereby improving the uniformity of dyeing and avoiding the color spots.

[0034] Furthermore, the dyeing process is specifically as follows: the fabric that has undergone the pre-dyeing degreasing process is put into a vat, fed with cold water, and an acid leveling agent is added within 10 to 15 minutes; then the dye is added within 30 to 60 minutes; finally, an acid-releasing agent is added within 10 to 30 minutes; after running for 10 to 20 minutes, the temperature is raised to perform dyeing; the dye includes an acid fluorescent yellow dye and an acid turquoise blue dye.

[0035] Furthermore, the programmed temperature increase is as follows: increase the temperature to 45-55°C at 0.4-0.6°C / min and keep warm for 8-12 min; then increase the temperature to 65-75°C at 0.4-0.6°C / min and keep warm for 8-12 min; finally increase the temperature to 90-105°C at 0.4-0.6°C / min and keep warm for 25-35 min.

[0036] Furthermore, a setting process is performed after the dyeing process, and the temperature of the setting process is 140-150° C. and the machine speed is 20-25 m / min.

[0037] Embodiment 1 of the present invention is: a dyeing method for a nylon-spandex fabric with a high spandex content, the steps are as follows: S1. Fabric processing: the spandex content in the grey fabric is 28wt%.

[0038] S2, flat width degreasing process: process in Lixin flat width degreasing machine, add 5g / L degreasing agent DO (Shengyuan Chemical), the temperature is 90℃, and the speed is 20m / min.

[0039] S3, in-tank degreasing process: processed in the Ishaka overflow dyeing machine, adding 2g / L of degreasing agent DO (Shengyuan Chemical), the degreasing temperature is 50℃, and the degreasing time is 30min.

[0040] S4, scheduled process: perform scheduled treatment in Monfushi hot air stenter, add 5g / L antioxidant TUW (Hexin Chemical), temperature is 195℃, speed is 15m / min, air volume is 80%.

[0041] S5. Degreasing process before dyeing: Process in the Ishaka overflow dyeing machine, add 2g / L of degreasing agent DO (Shengyuan Chemical) and 1g / L of soda ash, the degreasing temperature is 80℃, and the degreasing time is 20min.

[0042] S6, hot water washing process: processed in the Ishaka overflow dyeing machine, the temperature is 80℃, the temperature is 20℃; the pH of the cloth surface after hot water washing is 8~9.

[0043] S7. Dyeing process: Processed in the Ishaka overflow dyeing machine, the fabric that has undergone the degreasing process before dyeing is put into the cylinder, cooled to below 35°C and added with cold water, and an acid leveling agent is added within 15 minutes; then the dye is added within 45 minutes; finally, an acid-releasing agent is added within 30 minutes; after running for 20 minutes, the temperature is increased to 50°C at 0.5°C / min and kept warm for 10 minutes; then the temperature is increased to 70°C at 0.5°C / min and kept warm for 10 minutes; finally, the temperature is increased to 98°C at 0.5°C / min and kept warm for 30 minutes for dyeing. At the end of dyeing, the pH of the dye solution is between 4 and 5; the dyeing formula is shown in Table 1.

[0044] Table 1

[0045] S8, setting process: setting treatment in Monforts hot air stenter setting machine, temperature is 150℃, speed is 20m / min.

[0046] Comparative Example 1 of the present invention is: The difference between Comparative Example 1 and Example 1 is that: the in-tank oil removal process is not included; the Yacosa VS is replaced by acetic acid, and the pH is adjusted to 4-5 after adding acetic acid.

[0047] Comparative Example 2 of the present invention is: The only difference between Comparative Example 2 and Example 1 is that the open width degreasing process is not included.

[0048] Comparative Example 3 of the present invention is: The only difference between Comparative Example 3 and Example 1 is that the pre-dyeing degreasing process is not included.

[0049] The appearance of the finished fabrics after dyeing in Example 1 and Comparative Examples 1 to 3 was visually observed, as shown in Table 2.

[0050] Table 2

[0051] Embodiment 2 of the present invention is: a dyeing method for a nylon-spandex fabric with a high spandex content, the steps are as follows: S1. Fabric processing: the spandex content in the grey fabric is 28wt%.

[0052] S2, flat width degreasing process: process in Lixin flat width degreasing machine, add 3g / L degreasing agent DO (Shengyuan Chemical), temperature is 80℃, speed is 20m / min.

[0053] S3, in-cylinder degreasing process: process in Lixin flat width degreasing machine, add 1g / L degreasing agent DO (Shengyuan Chemical), degreasing temperature is 55℃, degreasing time is 20min.

[0054] S4. Scheduled process: Perform setting treatment in Monfushi hot air stentering machine, add 3g / L antioxidant TUW (Hexin Chemical), temperature is 190℃, speed is 20m / min, air volume is 80%.

[0055] S5. Degreasing process before dyeing: Process in the Ishaka overflow dyeing machine, add 3g / L of degreasing agent DO (Shengyuan Chemical) and 1.5g / L of soda ash, the degreasing temperature is 90℃, and the degreasing time is 15min.

[0056] S6, hot water washing process: processed in the Ishaka overflow dyeing machine, the temperature is 85℃, the temperature is 15℃; the pH of the cloth surface after hot water washing is 8~9.

[0057] S7. Dyeing process: Processed in an Ishaka overflow dyeing machine, the fabric that has undergone the degreasing process before dyeing is put into a cylinder, cooled to below 35°C and added with cold water, and an acid leveling agent is added within 10 minutes; then the dye is added within 30 minutes; finally, an acid-releasing agent is added within 10 minutes; after running for 10 minutes, the temperature is increased to 5°C at 0.6°C / min and kept warm for 8 minutes; then the temperature is increased to 75°C at 0.6°C / min and kept warm for 8 minutes; finally, the temperature is increased to 105°C at 0.6°C / min and kept warm for 25 minutes for dyeing. At the end of dyeing, the pH of the dye solution is between 4 and 5; the dyeing formula is shown in Table 1.

[0058] S8, setting process: the setting temperature is 140℃ and the machine speed is 25m / min in the Monforts hot air stenter setting machine.

[0059] Embodiment 3 of the present invention is: a dyeing method for a nylon-spandex fabric with a high spandex content, the steps are as follows: S1. Fabric processing: the spandex content in the grey fabric is 28wt%.

[0060] S2, flat width degreasing process: process in Lixin flat width degreasing machine, add 4g / L degreasing agent DO (Shengyuan Chemical), the temperature is 85℃, and the speed is 18m / min.

[0061] S3, in-tank degreasing process: processed in the Ishaka overflow dyeing machine, adding 1.5g / L of degreasing agent DO (Shengyuan Chemical), the degreasing temperature is 53℃, and the degreasing time is 25min.

[0062] S4. Scheduled process: Perform setting treatment in Monfushi hot air stentering machine, add 4g / L antioxidant TUW (Hexin Chemical), temperature is 193℃, speed is 18m / min, air volume is 80%.

[0063] S5. Degreasing process before dyeing: Process in the Ishaka overflow dyeing machine, add 2.5g / L of degreasing agent DO (Shengyuan Chemical) and 1.3g / L of soda ash, the degreasing temperature is 85℃, and the degreasing time is 25min.

[0064] S6, hot water washing process: processed in the Ishaka overflow dyeing machine, the temperature is 75℃, the temperature is 25℃; the pH of the cloth surface after hot water washing is 8~9.

[0065] S7. Dyeing process: Processed in an Ishaka overflow dyeing machine, the fabric that has undergone the pre-dyeing degreasing process is put into a cylinder, cooled to below 35°C and then filled with cold water, and an acid leveling agent is added within 12 minutes; then the dye is added within 60 minutes; finally, an acid-releasing agent is added within 20 minutes; after running for 15 minutes, the temperature is increased to 45°C at 0.4°C / min and kept warm for 12 minutes; then the temperature is increased to 65°C at 0.4°C / min and kept warm for 12 minutes; finally, the temperature is increased to 90°C at 0.4°C / min and kept warm for 35 minutes for dyeing. At the end of dyeing, the pH of the dye solution is between 4 and 5; the dyeing formula is shown in Table 1.

[0066] S8, setting process: the setting temperature is 145℃ and the machine speed is 23m / min in the Monforts hot air stenter setting machine.

[0067] In summary, the dyeing method of nylon-spandex fabric with high spandex content provided by the present invention fully removes the textile oil on the nylon-spandex fabric to avoid the oil spot problem through three degreasing steps. Flat-width degreasing can preliminarily remove the textile oil on the fabric surface, and make the fabric surface shrink flat to avoid creases on the fabric surface due to excessive shrinkage during degreasing in the cylinder; low-temperature degreasing in the cylinder further removes the textile oil remaining on the fabric surface on the basis of flat-width degreasing, and ensures that the fabric will not shrink excessively and cause creases while removing the oil through low-temperature treatment; after the first two steps of degreasing, most of the fabric oil is removed, and the third step uses alkaline degreasing to completely remove the textile oil and make the fabric surface alkaline.

[0068] The alkaline cloth surface is washed with hot water to remove the residual alkali agent, and the initial dyeing temperature is controlled to be low, and the acid-releasing agent is used instead of acetic acid to avoid sudden dyeing and color spots.

[0069] The above descriptions are merely embodiments of the present invention and are not intended to limit the patent scope of the present invention. Any equivalent transformations made using the specification of the present invention, or directly or indirectly applied in related technical fields, are also included in the patent protection scope of the present invention.

Claims

1. A dyeing method for high spandex content nylon-spandex fabric, characterized in that: The method comprises the following steps: sequentially carrying out a flat width degreasing process, an in-tank degreasing process, a predetermined process, a pre-dyeing degreasing process, a hot water washing process and a dyeing process.

2. The dyeing method of high spandex content nylon-spandex fabric according to claim 1, characterized in that: It also includes the cloth sorting process before the open-width degreasing process.

3. The dyeing method of high spandex content nylon-spandex fabric according to claim 1, characterized in that: In the open width degreasing process, 3-5 g / L of neutral degreasing agent is added.

4. The dyeing method of high spandex content nylon-spandex fabric according to claim 1, characterized in that: The temperature of the flat width degreasing process is 80-90°C and the vehicle speed is 15-20m / min.

5. The dyeing method of nylon-spandex fabric with high spandex content according to claim 1, characterized in that: 1-2 g / L of neutral degreasing agent is added during the in-cylinder degreasing process.

6. The dyeing method of high spandex content nylon-spandex fabric according to claim 1, characterized in that: The degreasing temperature of the in-cylinder degreasing process is 50-55°C, and the degreasing time is 20-30 minutes.

7. The dyeing method of nylon-spandex fabric with high spandex content according to claim 1, characterized in that: The temperature of the predetermined process is 190-195° C., and the vehicle speed is 15-20 m / min.

8. The dyeing method of nylon-spandex fabric with high spandex content according to claim 1, characterized in that: In the degreasing process before dyeing, 2-3 g / L of degreasing agent and 1-1.5 g / L of soda ash are added.

9. The dyeing method of nylon-spandex fabric with high spandex content according to claim 1, characterized in that: The degreasing temperature of the degreasing process before dyeing is 80-90° C., and the degreasing time is 15-25 minutes.

10. The dyeing method of nylon-spandex fabric with high spandex content according to claim 1, characterized in that: The dyeing process is specifically as follows: putting the fabric that has undergone the pre-dyeing degreasing process into a vat, adding cold water, adding an acid leveling agent, a dye and an acid-releasing agent in sequence, and then performing dyeing by program heating; the dye includes an acid fluorescent yellow dye and an acid turquoise blue dye.

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