Processing method for improving dyeing depth and color fastness of chinlon / spandex fabric

Abstract

The invention provides a processing method for improving the dyeing depth and color fastness of a chinlon / spandex fabric, and relates to the technical field of textiles. According to the processing method, the deep-dyed nylon / spandex single-face straight cloth serves as the gray fabric, the dyeing depth and color fastness of the nylon / spandex fabric are improved through the steps of pre-shaping, dyeing, color fixing, finished product shaping and the like, the processing method is simple in process and low in cost, the dosage of dye and chemicals is reduced, the production cost is reduced, and meanwhile wastewater discharge and environmental pollution are reduced.

Description

Technical Field

[0001] The invention relates to the technical field of textiles, and in particular to a processing method for improving the dyeing depth and color fastness of nylon / spandex fabrics. Background Art

[0002] Nylon has high strength, high elasticity, excellent wear resistance, and good moisture absorption. It is often used to make socks, scarves, clothes, etc. Due to its good wear resistance, it is suitable for making mountaineering clothes and winter clothes. Spandex is known for its extremely high elasticity. It can be stretched to 6-7 times its original length and recover quickly. It is widely used in tights, sportswear, jockstraps and soles, but it has poor moisture absorption. Therefore, these two fibers are often blended to combine the advantages of the two raw materials.

[0003] Nylon / spandex fabric is a high-performance fabric with high elasticity, wear resistance and comfort. It is suitable for making sportswear, yoga wear, tights and underwear, which require high elasticity and comfort. Clothes made of nylon / spandex fabric are comfortable to wear, close-fitting but not tight, and very suitable for frequent wearing and washing.

[0004] In the traditional fabric dyeing process, acid dyes, disperse dyes or reactive dyes are generally used for dyeing medium and light-colored fabrics. These dyes can meet the depth requirements of dyeing, and after proper color fixation treatment, the washing fastness can reach above level 4, meeting the production needs. However, due to the limited number of amino groups on the nylon macromolecular chain, the dyeing depth is insufficient, especially in the extremely dark black and red dyeing process, the dyeing depth is difficult to achieve the expected. In addition, when nylon and spandex are interwoven, some acid dyes are adsorbed on spandex, resulting in the spandex "color grabbing" problem, which reduces the amount of dyes dyed on nylon and further affects the dyeing depth. At the same time, acid dyes cannot form real ionic bonds or covalent bonds with spandex, but are only adsorbed on the surface of spandex, resulting in poor color fastness of the dyed fabric.

[0005] At present, the existing technology generally overcomes the problem of insufficient dyeing depth of nylon / spandex fabrics by increasing the amount of acid dyes, and overcomes the problem of poor color fastness of nylon / spandex fabrics by increasing water washing and multiple color fixation. However, these two methods are cumbersome to operate, complex in process, cause serious environmental pollution, are greatly affected by specific operations, and have very limited effect on improving the depth of dyeing and color fastness.

[0006] Therefore, developing an environmentally friendly, simple to operate, and low-cost processing method for improving the dyeing depth and color fastness of nylon / spandex fabrics is of great significance to improving the production efficiency and product quality of nylon / spandex fabrics. Summary of the invention

[0007] In view of this, the present invention provides a processing method for improving the dyeing depth and color fastness of nylon / spandex fabrics. The method significantly improves the dyeing depth and color fastness of nylon / spandex fabrics by adjusting the types and ratios of raw materials and auxiliaries, and adjusting the processing steps and process parameters.

[0008] The processing method for improving the dyeing depth and color fastness of nylon / spandex fabrics of the present invention comprises the following steps:

[0009] S1, shrinking the grey cloth and performing pre-forming treatment;

[0010] S2, immersing the predetermined grey cloth into dye solution for dyeing;

[0011] S3, immersing the grey cloth in a color fixing solution after dyeing for color fixing treatment;

[0012] S4, after the color fixing treatment, the finished product is shaped to obtain a dark nylon / spandex fabric.

[0013] Furthermore, the grey fabric is a dark-dyed nylon / spandex single-sided straight stripe fabric, which is composed of dark-dyed nylon 70D / 68F full-dull processed yarn, 90%; spandex 30D, 10%, and a gram weight of 135g / m 2 .

[0014] Furthermore, the shrinking vehicle speed is 20 m / min, and the water temperature of each treatment tank during the shrinking process is set as follows: 80°C for the first tank, 85°C for the second tank, 85°C for the third tank, 75°C for the fourth tank, room temperature for the fifth tank, and room temperature for the sixth tank.

[0015] Furthermore, the third tank water also contains 1-5 g / L of refined emulsifier and 0.5-1.5 g / L of soda ash, and the fifth tank water also contains 0.1-1 g / L of glacial acetic acid. Preferably, the third tank water also contains 3 g / L of refined emulsifier and 1 g / L of soda ash, and the fifth tank water also contains 0.5 g / L of glacial acetic acid.

[0016] Furthermore, the pre-setting temperature is 190°C to 200°C, the speed is 25 to 35 m / min, and the pre-setting machine width is 132 cm×130 g / m 2 Preferably, the pre-setting temperature is 195°C, the speed is 30m / min, and the pre-setting machine width is 132cm×130g / m 2 .

[0017] Further, the dyeing liquid is composed of the following raw materials in mass percentage: acid black BHbs 3% to 5%, acid yellow NFS 0.3% to 1%, acid red NFS 0.3% to 1%, acid leveling agent FC-2011% to 5%, dispersant IS1 to 3g / L, spandex anti-staining agent FC-2892% to 3%, pH regulator 0.5% to 1%, and the balance is water. Preferably, the dyeing liquid is composed of the following raw materials in mass percentage: acid black BHbs 4%, acid yellow NFS 0.6%, acid red NFS 0.6%, acid leveling agent FC-2012%, dispersant IS2g / L, spandex anti-staining agent FC-2892.5%, pH regulator 0.7%, and the balance is water.

[0018] Furthermore, the dyeing temperature is 95°C to 100°C, and the dyeing time is 20 to 40 minutes. Preferably, the dyeing temperature is 98°C, and the dyeing time is 30 minutes.

[0019] Furthermore, the color fixing solution comprises 1-3 g / L of the acidic color fixing agent FIX-3236. Preferably, the color fixing solution comprises 2 g / L of the acidic color fixing agent FIX-3236.

[0020] Furthermore, the color fixing treatment temperature is 55°C to 65°C, and the color fixing time is 15 to 25 minutes. Preferably, the color fixing treatment temperature is 60°C, and the color fixing time is 20 minutes.

[0021] Furthermore, the shaping temperature of the finished product is 110°C to 150°C, and the speed is 20 to 30 m / min. Preferably, the shaping temperature of the finished product is 130°C, and the speed is 25 m / min.

[0022] Compared with the prior art, the beneficial technical effects of the present invention are:

[0023] The invention significantly improves the dyeing depth and color fastness of nylon / spandex fabric by adjusting the composition of grey cloth, the type of auxiliary agent and the dyeing process parameters, ensures a more stable and consistent dyeing effect and reduces the shedding and migration of dyes during washing and use.

[0024] The present invention ensures the stability and controllability of the processing process through detailed process and parameter definition, and reduces the impact of process fluctuations on the quality of the final product.

[0025] The processing method of the invention can also improve the feel and appearance of the fabric, making it softer, smoother, and having good elasticity and gloss.

[0026] The processing method provided by the invention has simple process and low cost, reduces the usage of dyes and chemicals, reduces production cost, and reduces wastewater discharge and environmental pollution. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] The present invention will be further described below in conjunction with the accompanying drawings.

[0028] Figure 1 The present invention is a flow chart of a processing method for improving the dyeing depth and color fastness of nylon / spandex fabrics. DETAILED DESCRIPTION

[0029] The present invention provides a processing method for improving the dyeing depth and color fastness of nylon / spandex fabrics, comprising the following steps:

[0030] S1, shrinking the grey cloth and performing pre-forming treatment;

[0031] S2, immersing the predetermined grey cloth into a dyeing solution for dyeing;

[0032] S3, immersing the grey cloth in a color fixing solution after dyeing for color fixing treatment;

[0033] S4, after the color fixing treatment, the finished product is shaped to obtain a dark nylon / spandex fabric.

[0034] In one embodiment, the grey fabric is a dark-dyed nylon / spandex single-sided straight striped fabric, which is composed of dark-dyed nylon 70D / 68F full-dull processed yarn, 90%; spandex 30D, 10%, with a gram weight of 135g / m 2 .

[0035] The invention limits the specifications of the grey cloth, thereby making the fabric more comfortable and fit, ensuring the thickness and strength of the fabric, and being suitable for the needs of dark-colored dyeing.

[0036] In one embodiment, the shrinking vehicle speed is 20m / min, and the water temperature of each treatment tank during the shrinking process is set as follows: the water temperature of each treatment tank is set as follows: 80°C for the first tank, 85°C for the second tank, 85°C for the third tank, 75°C for the fourth tank, room temperature for the fifth tank, and room temperature for the sixth tank.

[0037] In one embodiment, the third tank water further comprises 1-5 g / L of refined emulsifier and 0.5-1.5 g / L of soda ash, and the fifth tank water further comprises 0.1-1 g / L of glacial acetic acid.

[0038] In one embodiment, the third tank water further comprises 3 g / L of refined emulsifier and 1 g / L of soda ash, and the fifth tank water further comprises 0.5 g / L of glacial acetic acid.

[0039] The invention utilizes a plurality of treatment tanks for shrinking, so that the fabric can shrink freely under the action of water and heat. The use of refined emulsifier, soda ash and glacial acetic acid can help remove oil stains on the fabric, enhance the degreasing effect, neutralize residual alkaline substances and prevent fabric damage.

[0040] In one embodiment, the pre-setting temperature is 190°C to 200°C, the speed is 25 to 35 m / min, and the pre-setting machine width is 132 cm×130 g / m 2 .

[0041] In one embodiment, the pre-setting temperature is 195°C, the speed is 30 m / min, and the pre-setting machine width is 132 cm×130 g / m 2 .

[0042] The specific pre-setting process can effectively stabilize the fabric dimensions and prevent deformation during the subsequent dyeing and fixing process.

[0043] In one embodiment, the dyeing liquid is composed of the following raw materials in percentage by mass: acid black BHbs 3% to 5%, acid yellow NFS 0.3% to 1%, acid red NFS 0.3% to 1%, acid leveling agent FC-2011% to 5%, dispersant IS 1 to 3 g / L, spandex anti-staining agent FC-289 2% to 3%, pH adjuster 0.5% to 1%, and the balance is water.

[0044] In one embodiment, the dyeing solution is composed of the following raw materials in percentage by mass: acid black BHbs 4%, acid yellow NFS 0.6%, acid red NFS 0.6%, acid leveling agent FC-20 12%, dispersant IS 2g / L, spandex anti-staining agent FC-28 9 2.5%, pH regulator 0.7%, and the balance is water.

[0045] The composition and proportion of the dyeing solution are designed to ensure uniformity of the dyeing effect, color fastness and adaptability to nylon / spandex fabrics. Acid dyes (acid black BHbs, acid yellow NFS, acid red NFS) can form a strong chemical bond with nylon fibers, improving the depth of dyeing and color fastness. Acid leveling agent FC-210 promotes uniform distribution of dyes on the fiber to prevent color spots or color differences. Dispersant IS helps disperse the dye in the dyeing solution and prevents the aggregation of dye particles. Spandex anti-staining agent FC-289 promotes uniform adhesion of dyes on spandex and improves the depth of fabric dyeing. pH adjusters adjust the pH value of the dyeing solution to improve the dye uptake and color fastness of the dye while protecting the fiber.

[0046] In one embodiment, the dyeing temperature is 95° C. to 100° C., and the dyeing time is 20 to 40 minutes.

[0047] In one embodiment, the dyeing temperature is 98° C. and the dyeing time is 30 min.

[0048] The present invention ensures the dyeing effect by limiting the dyeing process parameters. 95°C to 100°C is one of the best temperature ranges for dyeing the grey cloth of the present invention with acid dyes. At this temperature, the dye molecules can fully diffuse and penetrate into the fiber, thereby improving the dyeing depth and uniformity. At the same time, this temperature will not lead to a decrease in the physical properties of the fiber, such as a decrease in elasticity and strength. The appropriate dyeing time is sufficient to allow the dye to fully combine with the fiber, ensure the uniformity and color fastness of the dyeing, and avoid excessive adsorption of the dye, which affects the feel and softness of the fiber. The setting of these parameters is based on a large amount of experimental data and actual production experience, and is intended to optimize the balance between the dyeing effect and the fabric performance.

[0049] In one embodiment, the fixing solution includes 1-3 g / L of acidic fixing agent FIX-3236.

[0050] In one embodiment, the fixing solution includes 2 g / L of acidic fixing agent FIX-3236.

[0051] The acidic dye fixing agent of the present invention prevents the dye from falling off the fiber by forming a chemical bond with the dye and the fiber, thereby enhancing the color fastness of the dyeing. More importantly, there is a synergistic effect between the acidic dye fixing agent and the spandex anti-staining agent. When the two are used in combination, not only the overall dyeing effect is improved, but also the color fastness and appearance quality of the fabric are ensured.

[0052] In one embodiment, the fixing treatment temperature is 55° C. to 65° C., and the fixing time is 15 to 25 minutes.

[0053] In one embodiment, the fixing treatment temperature is 60° C. and the fixing time is 20 min.

[0054] In one embodiment, the finished product shaping temperature is 110° C. to 150° C., and the speed is 20 to 30 m / min.

[0055] In one embodiment, the finished product forming temperature is 130° C. and the speed is 25 m / min.

[0056] The technical solution provided by the present invention is further described below in conjunction with embodiments.

[0057] The auxiliary agents used in the examples and comparative examples of the present invention are as follows:

[0058] Deep dyed nylon was purchased from Changde Meihua Nylon Co., Ltd.; refined emulsifier was purchased from Shanghai Xuanli Chemical Co., Ltd.; acid black BHb, acid yellow NFS, and acid red NFS were purchased from Jiangsu Dewang Chemical Co., Ltd.; acid leveling agent FC-201 and dispersant IS were purchased from Shanghai Xuanli Chemical Co., Ltd.; pH adjuster was purchased from Jiangyin Zhengyuan Technology Co., Ltd.; spandex anti-staining agent FC-289 was purchased from Shanghai Xuanli Chemical Co., Ltd.; acid fixing agent FIX-3236 was purchased from Suzhou Weimin Chemical Industry Co., Ltd.; spandex dyeing accelerator DLN-NEW was purchased from Guangdong Jusheng New Material Technology Co., Ltd.

[0059] Example 1 A processing method for improving the dyeing depth and color fastness of nylon / spandex fabrics, the steps are as follows:

[0060] S1, the composition is dark dyed nylon 70D / 68F full dull processed yarn, 90%; spandex 30D, 10%, gram weight is 135g / m 2 The dark-dyed nylon / spandex single-sided straight cloth was used as the grey cloth for shrinking. The water temperature of each treatment tank during the shrinking process was set as follows: 80°C for the first tank, 85°C for the second tank, 85°C for the third tank, 75°C for the fourth tank, room temperature for the fifth tank, and room temperature for the sixth tank. The water in the third tank also contained 3g / L of refined emulsifier and 1g / L of soda ash. The water in the fifth tank also contained 0.5g / L of glacial acetic acid. After shrinking, the pre-setting treatment was carried out at 195°C at a speed of 30m / min. The width of the machine under the pre-setting was 132cm×130g / m 2 ;

[0061] S2, immersing the pre-shaped grey cloth into the dyeing solution and dyeing at 98°C for 30 minutes;

[0062] The dyeing solution is composed of the following raw materials in percentage by mass: acid black BHbs 4%, acid yellow NFS 0.6%, acid red NFS 0.6%, acid leveling agent FC-2012%, dispersant IS2g / L, spandex anti-staining agent FC-2892.5%, pH regulator 0.7%, and the balance is water;

[0063] S3, after dyeing, the grey cloth is immersed in the fixing solution and fixed at 60℃ for 20min;

[0064] The fixing solution includes 2 g / L of acidic fixing agent FIX-3236, and the rest is water;

[0065] S4. After the color fixing treatment, the finished product is fixed at 130° C. at a speed of 25 m / min to obtain a dark nylon / spandex fabric.

[0066] Comparative Example 1

[0067] Same as Example 1, except that the grey fabric is a conventional nylon / spandex single-sided straight strip fabric with a gram weight of 135 g / m2 The ingredients are regular nylon 70D / 68F full-dull processed yarn, 90%; spandex 30D, 10%.

[0068] Comparative Example 2

[0069] Same as Example 1, except that the spandex anti-staining agent FC-289 is not used.

[0070] Comparative Example 3

[0071] Same as Example 1, except that the spandex anti-staining agent FC-289 is replaced by an equal amount of spandex dyeing accelerator DLN-NEW.

[0072] Test Example 1

[0073] The colors of the fabrics obtained in the examples and comparative examples were measured, and the results were tested based on comparative example 3. The results are as follows:

[0074] DL* Da* Db* DE Example 1 -0.87 -0.37 0.35 0.92 Comparative Example 1 -0.12 -0.09 0.11 0.23 Comparative Example 2 -0.57 -0.11 0.15 0.43

[0075] Test Example 2

[0076] According to GB / T 3921-2008 "Textiles - Tests for Color Fastness - Fastness to Soaping", the color fastness of the fabrics obtained in the examples and comparative examples was measured, and the results are as follows:

[0077]

[0078]

[0079] It can be seen from the test results of test examples 1-2 that the processing method provided by the present invention can significantly improve the dyeing depth and color fastness of dark nylon / spandex fabrics. At the same time, it can be seen from the test results of comparative example 3 that even if the spandex is dyed, the color fastness of dark nylon / spandex fabrics cannot be improved.

[0080] The principles and implementation methods of the present invention are described in this article using specific examples. The description of the above embodiments is only used to help understand the method and core idea of ​​the present invention. At the same time, for those skilled in the art, according to the idea of ​​the present invention, there will be changes in the specific implementation methods and application scope. In summary, the content of this specification should not be understood as limiting the present invention.

Claims

1. A processing method for improving the dyeing depth and color fastness of nylon / spandex fabrics, characterized in that: The following steps are involved: S1, shrinking the grey cloth and performing pre-forming treatment; S2, immersing the predetermined grey cloth into a dyeing solution for dyeing; S3, immersing the grey cloth in a color fixing solution after dyeing for color fixing treatment; S4, after the color fixing treatment, the finished product is shaped to obtain a dark nylon / spandex fabric. The grey fabric is a dark-dyed nylon / spandex single-sided straight striped fabric, which is composed of dark-dyed nylon 70D / 68F full-dull processed yarn, 90%; spandex 30D, 10%, and a gram weight of 135g / m 2 ; The dyeing liquid is composed of the following raw materials in percentage by mass: 3% to 5% of acid black BHbs, 0.3% to 1% of acid yellow NFS, 0.3% to 1% of acid red NFS, 1% to 5% of acid leveling agent FC-201, 1% to 5% of dispersant IS, 2% to 3% of spandex anti-staining agent FC-289, 0.5% to 1% of pH regulator, and the balance is water.

2. A processing method for improving the dyeing depth and color fastness of nylon / spandex fabric according to claim 1, characterized in that: During the refining process, the water temperature of each treatment tank is set as follows: 80°C for the first tank, 85°C for the second tank, 85°C for the third tank, 75°C for the fourth tank, room temperature for the fifth tank, and room temperature for the sixth tank.

3. A processing method for improving the dyeing depth and color fastness of nylon / spandex fabric according to claim 1, characterized in that: The water in the second tank and the third tank also contains 1-5 g / L of refined emulsifier and 0.5-1.5 g / L of soda ash, and the water in the fifth tank also contains 0.1-1 g / L of glacial acetic acid.

4. A processing method for improving the dyeing depth and color fastness of nylon / spandex fabric according to claim 3, characterized in that: The third tank water also contains 3 g / L of refined emulsifier and 1 g / L of soda ash, and the fifth tank water also contains 0.5 g / L of glacial acetic acid.

5. A processing method for improving the dyeing depth and color fastness of nylon / spandex fabric according to claim 1, characterized in that: The preforming temperature is 190° C. to 200° C., and the speed is 25 to 35 m / min.

6. A processing method for improving the dyeing depth and color fastness of nylon / spandex fabric according to claim 1, characterized in that: The dyeing liquid is composed of the following raw materials in percentage by mass: 4% of acid black BHbs, 0.6% of acid yellow NFS, 0.6% of acid red NFS, 12% of acid leveling agent FC-20, 2g / L of dispersant IS, 2.5% of spandex anti-staining agent FC-289, 0.7% of pH regulator, and the balance is water.

7. A processing method for improving the dyeing depth and color fastness of nylon / spandex fabric according to claim 1, characterized in that: The dyeing temperature is 95° C. to 100° C., and the dyeing time is 20 to 40 minutes.

8. The method for improving the dyeing depth and color fastness of nylon / spandex fabric according to claim 1, characterized in that: The fixing solution comprises 1-3 g / L of acidic fixing agent FIX-3236.

9. A processing method for improving the dyeing depth and color fastness of nylon / spandex fabric according to claim 1, characterized in that: The color fixing treatment temperature is 55° C. to 65° C., and the color fixing treatment time is 15 to 25 minutes.

10. A processing method for improving the dyeing depth and color fastness of nylon / spandex fabric according to claim 1, characterized in that: The finished product shaping temperature is 110° C. to 150° C., and the speed is 20 to 30 m / min.

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