Dyeing and finishing process for improving color migration fastness of brocade-spandex fabric through waterproof finishing

Abstract

The invention relates to a dyeing and finishing process for improving color migration fastness of brocade-spandex fabric through waterproof finishing, which comprises the following steps: washing deep-dyed fabric and light-dyed fabric by using a washing machine at the washing temperature of 70-90 DEG C and the washing speed of 15-25m / min, adding an oil removing agent for continuous boiling off, and then carrying out high-temperature presetting by using a setting machine to reshape a fabric crystalline region; cloth is fed at normal temperature, the bath ratio is 1: 10-1: 15, operation is performed at normal temperature for 5-10 min after cloth feeding, after the dyed cloth is fully soaked and swelled, an oil removal agent and sodium carbonate are added for oil removal, and then the dyed cloth is neutralized with glacial acetic acid for 10 min at normal temperature and dried; the method comprises the following steps: dyeing a to-be-dyed dark-color fabric into a dark color by using an acid dye, and dyeing a to-be-dyed light-color fabric into white or not as required; pre-drying the dyed fabric with hot air, preparing a finishing liquid, putting the fabric into the finishing liquid for padding treatment, and baking the fabric after the padding treatment is completed. According to the method, the color migration fastness can be remarkably improved to 3.5 level, and the staining problem of the dark brocade / spandex fabric in long-term transportation is solved.

Description

Technical Field

[0001] The present invention relates to the technical field of fabric dyeing and finishing, and in particular to a dyeing and finishing process for improving the color migration fastness of nylon - spandex fabrics through waterproof finishing. Background Art

[0002] Knitted fabrics blended with nylon and spandex (hereinafter referred to as nylon - spandex fabrics) are widely used in high - value - added clothing fields such as sportswear, underwear, and swimwear due to their excellent elasticity, abrasion resistance, and soft skin - friendly properties. In recent years, with the increasing demand for diversified clothing design by consumers, clothing styles with dark and light color splicing have gradually become the market mainstream. This design trend poses higher requirements for the color migration fastness of dark nylon - spandex fabrics because when the dark and light color areas are in direct contact, the problem of dye migration is more likely to be exposed.

[0003] During the post - dyeing processing, storage, and transportation of dark nylon - spandex fabrics, color staining often appears on the surface of adjacent light - colored fabrics due to the migration of unfixed dyes, seriously affecting the appearance quality of finished garments and causing returns and sales losses. Especially for nylon - spandex fabrics with a high spandex content, since spandex itself has a weak adsorption capacity for dyes, dyes are more likely to migrate from the fiber surface, further exacerbating the staining problem. Currently, the conventional solutions in the industry for the color migration problem of nylon - spandex fabrics include:

[0004] Fixing agent treatment: By combining cationic fixing agents with anionic groups in acid dyes to reduce dye dissociation. However, the fixing agent can easily make the fabric feel hard and has limited improvement in color migration fastness (usually only improving by about 0.5 grades).

[0005] Dyeing process optimization: Such as extending the dyeing time, increasing the dyeing temperature, or adjusting the pH value, but it may increase energy consumption and affect the elasticity of the fabric.

[0006] Physical isolation packaging: Using anti - staining films to isolate dark and light - colored fabrics, but the cost is high. Summary of the Invention

[0007] The purpose of the present invention is to provide a dyeing and finishing process for improving the color migration fastness of nylon - spandex fabrics through waterproof finishing, which can significantly improve the color migration fastness to 3.5 grades and solve the staining problem of dark nylon - spandex fabrics with a high spandex content during long - term transportation.

[0008] To achieve the above - mentioned purpose, the present invention provides the following technical solution: A dyeing and finishing process for improving the color migration fastness of nylon - spandex fabrics through waterproof finishing, comprising the following steps:

[0009] Step S1, Washing and Degreasing and Pre-setting Process: Wash the dark-colored fabric and the fabric to be dyed light-colored with a washing machine. The washing temperature is 70 - 90°C, and the washing speed is 15 - 25 m / min. After adding a degreasing agent and continuously boiling, perform high-temperature pre-setting with a setting machine. The setting temperature is 190 - 200°C, and the setting time is 75 - 85 s to reshape the crystalline region of the fabric;

[0010] Step S2, Pretreatment Process for the Dark-colored Fabric to be Dyed: First, feed the fabric at room temperature with a liquor ratio of 1:10 - 1:15. After feeding, run at room temperature for 5 - 10 min. After the fabric to be dyed is fully wetted and swollen, add a degreasing agent and soda ash, and raise the temperature to 97 - 99°C. Keep warm for 15 - 25 min for degreasing. After the pretreatment degreasing, neutralize with glacial acetic acid at room temperature for 10 - 15 min and then dry;

[0011] Step S3, Dyeing Process: Use acid dyes to dye the dark-colored fabric to be dyed dark, and dye the light-colored fabric to be dyed white or leave it untreated according to needs;

[0012] Step S4, Hot-air Pre-dry the Dyed Fabric, Prepare a finishing solution, put the fabric into the finishing solution for padding treatment, and perform curing treatment on the fabric after the padding treatment.

[0013] Furthermore, the finishing solution in Step S4 includes 2% - 4% o.w.f. of a fluorine-free water repellent, and the fluorine-free water repellent is an acrylic polyurethane type fluorine-free water repellent.

[0014] Furthermore, the concentration of soda ash in Step S2 is 1 - 2 g / L, the concentration of glacial acetic acid is 0.3 - 0.6 g / L, and the concentration of the degreasing agent in both Step S1 and Step S2 is 1 - 3 g / L.

[0015] Furthermore, Step S3 further includes:

[0016] Step S31, Dark-color Dyeing: Add acid metal dyes, glacial acetic acid, and an acid leveling agent at room temperature, and raise the temperature to 97 - 99°C. Keep warm for 20 - 40 min;

[0017] Step S32, Dark-color Fixing: Add an acid fixing agent and glacial acetic acid, and raise the temperature to 60 - 80°C. Keep warm for 20 - 40 min;

[0018] Step S33, Light-color Treatment: Add a nylon brightening agent, glacial acetic acid, and an acid leveling agent, and raise the temperature to 97 - 99°C. Keep warm for 15 - 25 min.

[0019] Furthermore, the mass fraction of the acid metal dyes in Step S31 is 2% - 4%, the concentration of glacial acetic acid is 0.5 - 1.5 g / L, and the concentration of the acid leveling agent is 0.1 - 0.5 g / L.

[0020] Further, the heating rate in step S31 is 2 °C / min.

[0021] Further, the mass fraction of the acid fixing agent in step S32 is 3% - 5%, and the concentration of glacial acetic acid is 0.3 - 0.7 g / L.

[0022] Further, the mass fraction of the nylon brightening agent in step S33 is 0.5% - 1.5%; the concentration of glacial acetic acid is 0.3 - 0.7 g / L, and the concentration of the acid leveling agent is 0.3 - 0.7 g / L.

[0023] Further, the padding rate of the finishing liquor in step S4 is 73% - 77%, the finishing liquor further includes 0.2% - 0.7% o.w.f. penetrant, the pH value of the finishing liquor is 4.8 - 5.2, and the temperature of the finishing liquor is 25 - 30 °C.

[0024] Further, the pre-drying and baking treatments are further as follows: the hot air pre-drying is further: pre-drying with a hot air dryer, the temperature is 130 - 160 °C, and the time is 75 - 85 s; the baking treatment is carried out with a hot air stenter, the baking temperature is 165 - 175 °C, and the time is 75 - 85 s.

[0025] The beneficial effects of the present invention: Provide a high-efficiency and low-cost dyeing and finishing process. By simultaneously applying fluorine-free waterproof finishing to dark and light nylon-ammonia fabrics, a two-way barrier is formed, significantly improving the color migration fastness to level 3.5 and solving the problem of color bleeding of dark nylon-ammonia fabrics during long-term transportation. Description of the Drawings

[0026] Figure 1 It is a physical picture of Comparative Example 1 and Example 1;

[0027] Figure 2 For Figure 1 the physical picture of the dark and light color contrast of Comparative Example 1 with a color migration fastness of 2.0;

[0028] Figure 3 For Figure 1 the physical picture of the dark color of Comparative Example 1 colliding with multi-fiber fabric with a color migration fastness of 3.5;

[0029] Figure 4 For Figure 1 the physical picture of the dark and light color contrast of Example 1 with a color migration fastness of 3.5;

[0030] Figure 5 For Figure 1 the physical picture of the dark color of Example 1 colliding with multi-fiber fabric with a color migration fastness of 4.0. Detailed Embodiments

[0031] The present invention will be further described below in conjunction with the accompanying drawings.

[0032] Please refer to Figure 1 、 Figure 4 、 Figure 5 , the present invention provides an embodiment: a dyeing and finishing process for improving the color migration fastness of nylon-ammonia fabric through waterproof finishing, including the following steps:

[0033] Step S1, water washing for degreasing and pre-setting process: Wash the dark-colored fabric to be dyed and the light-colored fabric to be dyed with a water washing machine, the water washing temperature is 70-90 °C, the water washing speed is 15-25 m / min, then continuously boil with a degreasing agent, and then perform high-temperature pre-setting with a setting machine, the setting temperature is 190-200 °C, and the setting time is 75-85 s, so as to reshape the crystal region of the fabric; Reshaping the crystal region of the fabric can improve the fabric stability and the effect of leveling dyeing.

[0034] Step S2, pre-treatment process for the dark-colored fabric to be dyed: First, feed the fabric at room temperature, the liquor ratio is 1:10-1:15. After feeding the fabric, run at room temperature for 5-10 min. After the fabric to be dyed is fully wetted and swollen, add a degreasing agent and soda ash, heat up to 97-99 °C, and keep warm for 15-25 min for degreasing. After pre-treatment degreasing, neutralize with glacial acetic acid at room temperature for 10-15 min and then dry; The function of the pre-treatment is to remove the spinning oil agent, wax and impurities on the fiber surface, make the establishment of the hydrophobic layer more firm during waterproof finishing, and increase the waterproof effect.

[0035] Step S3, dyeing process: Use acid dyes to dye the dark-colored fabric to be dyed into a dark color, and dye the light-colored fabric to be dyed into white or leave it untreated according to needs;

[0036] Step S4, fabric waterproof finishing process: Pre-dry the dyed fabric with hot air, prepare a finishing solution, put the fabric into the finishing solution for padding treatment, and perform baking treatment on the fabric after padding treatment.

[0037] Please continue to refer to Figure 1 、 Figure 3 、 Figure 4 As shown, in an embodiment of the present invention, the finishing solution in step S4 includes 2%-4% o.w.f. of a fluorine-free waterproof agent, and the fluorine-free waterproof agent is an acrylic polyurethane type fluorine-free waterproof agent. The model of the fluorine-free waterproof agent is the R-300 series. The waterproof effect of this fluorine-free waterproof agent can block for a longer time compared with other waterproof agents, achieving a better effect.

[0038] Please continue to refer to Figure 1 、 Figure 4 、 Figure 5As shown, in one embodiment of the present invention, the concentration of soda ash in step S2 is 1-2 g / L, the concentration of glacial acetic acid is 0.3-0.6 g / L, and the concentration of the degreasing agent in both step S1 and step S2 is 1-3 g / L.

[0039] Please continue to refer to Figure 1 、 Figure 3 、 Figure 4 As shown, in one embodiment of the present invention, step S3 further includes:

[0040] Step S31, dark coloring: Add acid metal dye, glacial acetic acid, and acid leveling agent at room temperature, and heat up to 97-99 °C, with a holding time of 20-40 min;

[0041] Step S32, dark color fixation: Add acid fixing agent and glacial acetic acid, heat up to 60-80 °C, with a holding time of 20-40 min; The holding time is preferably 20 °C and 30 °C.

[0042] Step S33, light color treatment: Add nylon brightener, glacial acetic acid, and acid leveling agent, heat up to 97-99 °C, with a holding time of 15-25 min.

[0043] Please continue to refer to Figure 1 、 Figure 4 、 Figure 5 As shown, in one embodiment of the present invention, the mass fraction of the acid metal dye in step S31 is 2%-4%, the concentration of glacial acetic acid is 0.5-1.5 g / L, and the concentration of the acid leveling agent is 0.1-0.5 g / L. The concentration of glacial acetic acid is preferably 1 g / L, and the acid leveling agent is preferably 0.2 g / L and 0.5 g / L.

[0044] Please continue to refer to Figure 1 、 Figure 4 、 Figure 5 As shown, in one embodiment of the present invention, the heating rate in step S31 is 2 °C / min.

[0045] Please continue to refer to Figure 1 、 Figure 4 、 Figure 5 As shown, in one embodiment of the present invention, the mass fraction of the acid fixing agent in step S32 is 3%-5%, and the concentration of glacial acetic acid is 0.3-0.7 g / L.

[0046] Please continue to refer to Figure 1 、 Figure 3 、 Figure 4As shown in the figure, in one embodiment of the present invention, the mass fraction of the nylon brightening agent in step S33 is 0.5% - 1.5%; the concentration of glacial acetic acid is 0.3 - 0.7 g / L, and the concentration of the acid leveling agent is 0.3 - 0.7 g / L. The mass fraction of the nylon brightening agent is preferably 1%; the concentration of glacial acetic acid is preferably 0.5 g / L, and the concentration of the acid leveling agent is preferably 0.5 g / L.

[0047] Please continue to refer to Figure 1 、 Figure 4 、 Figure 5 As shown in the figure, in one embodiment of the present invention, the padding rate of the finishing liquor in step S4 is 73% - 77%, and the padding rate is controlled by the roller pressure. The finishing liquor further includes 0.2% - 0.7% o.w.f. penetrant, the pH value of the finishing liquor is 4.8 - 5.2, and the temperature of the finishing liquor is 25 - 30 °C. The pH of the finishing liquor is adjusted with acetic acid, and the fluorine-free water repellent used is an acrylic polyurethane type fluorine-free water repellent. By applying the fluorine-free water repellent finishing to dark and light fabrics simultaneously, a two-way barrier is formed to inhibit dye migration.

[0048] Please continue to refer to Figure 1 、 Figure 4 、 Figure 5 As shown in the figure, in one embodiment of the present invention, the hot air pre-drying is further as follows: pre-drying is carried out using a hot air dryer, the temperature is 130 - 160 °C, and the time is 75 - 85 s; ensuring that the moisture content of the fabric ≤ 10%, the curing treatment is carried out using a hot air stenter, the curing temperature is 165 - 175 °C, and the time is 75 - 85 s to promote the crosslinking and film formation of the water repellent. The water repellent forms a dense hydrophobic network structure on the fiber surface, and through physical shielding, it blocks the migration of dye molecules (especially the unfixed acid dye anions) to the light-colored fabric. Specific Example 1:

[0050] Select a nylon / ammonia double-sided fabric with a composition of 63% Nylon and 37% Elastane to improve the color migration fastness of its dark red and natural white. The test method is AATCC 163 opt 1.

[0051] 1. Washing degreasing and pre-setting process

[0052] Washing is carried out using a washing machine, the washing temperature is 80 °C, the washing speed is 20 m / min, and after continuous boiling with 2 g / L degreasing agent, high-temperature pre-setting is carried out using a stenter, the setting temperature is 200 °C, and the setting time is 80 s.

[0053] 2. Pretreatment of dark-colored fabric before dyeing

[0054] First, feed the fabric at room temperature with a liquor ratio of 1:12. After feeding the fabric, run it at room temperature for 10 minutes. After the dyed fabric is fully soaked and swollen, add 2 g / L of degreasing agent and 2 g / L of soda ash, then heat up to 98 °C and keep it warm for 20 minutes for degreasing treatment. After degreasing, neutralize it with 0.4 g / L of glacial acetic acid at room temperature for 10 minutes. The function of the pretreatment is to remove the spinning oil agent, wax and impurities on the fiber surface, make the establishment of the hydrophobic layer more firm during the waterproof finishing, and increase the waterproof effect.

[0055] 3. Dyeing process

[0056] The deep red dyeing process is as follows:

[0057] Raw materials:

[0058] Acid yellow: 1.5%

[0059] Acid Bordeaux: 2.0%

[0060] Acid light yellow: 0.5%

[0061] Acid leveling agent: 0.5 g / L

[0062] Glacial acetic acid: 1 g / L, heat up to 98 °C and keep it warm for 30 minutes

[0063] The soaping process is as follows:

[0064] Soaping agent: 1 g / L, heat up to 70 °C and keep it warm for 20 minutes

[0065] The color fixing process is as follows:

[0066] Acid color fixing agent: 4%

[0067] Glacial acetic acid: 0.5 g / L, heat up to 80 °C and keep it warm for 20 minutes

[0068] The off-white fabric is not dyed.

[0069] 4. The post-treatment process is

[0070] The deep red fabric is dried with clear water. The drying temperature is 130 °C and the drying time is 80 s. Together with the off-white fabric, it is treated with 3% owf of fluorine-free waterproof agent at a high temperature of 170 °C for 80 s using a stenter.

[0071] 5. Test results

[0072] Dye a dark-colored fabric with a dye dosage exceeding 3% and a light-colored fabric with a dye dosage less than 0.5% respectively through the methods of the first 3 steps, and then add the waterproof test to the effect after the waterproof finishing. Use the AATCC 163 opt1 color migration fastness test. The results are as follows:

[0073]

[0074] In short, when only the dark or light fabric is subjected to waterproof finishing, the improvement of color migration fastness is limited. The technical solution uses acrylic polyurethane fluorine-free waterproof finishing to effectively improve the color fastness of the contrast between dark and light nylon-ammonia by establishing a double hydrophobic structure on the fabric, effectively solving the problem of color staining caused by long-term transportation of the current market design of dark and light color combinations. Figures 1 to 5 The displays in are the test result diagrams of Comparative Example 1 and Example 1 respectively. It can be seen that synchronously performing waterproof finishing on dark and light fabrics can improve the fastness to 3.5 levels, significantly improving the color migration fastness of the fabric.

[0075] The above are only the preferred embodiments of the present invention, and should not be construed as limitations to this application. Any equivalent changes and modifications made according to the scope of the patent application of the present invention shall fall within the scope of the present invention.

Claims

1. A dyeing and finishing process for improving the color migration fastness of nylon-ammonia fabric through waterproof finishing, characterized in that: It includes the following steps: Step S1, water washing for degreasing and pre-setting process: Wash the dark-colored fabric and the fabric to be dyed light-colored with a water washing machine. The water washing temperature is 70 - 90°C, and the water washing speed is 15 - 25 m / min. After adding a degreasing agent and continuously boiling and refining, perform high-temperature pre-setting with a setting machine. The setting temperature is 190 - 200°C, and the setting time is 75 - 85 s to reshape the crystalline region of the fabric. Step S2, pre-treatment process for the dark-colored fabric to be dyed: First, feed the fabric at room temperature with a liquor ratio of 1:10 - 1:

15. After feeding the fabric, run it at room temperature for 5 - 10 min. After the fabric to be dyed is fully wetted and swollen, add a degreasing agent and soda ash, and raise the temperature to 97 - 99°C. Keep warm for 15 - 25 min for degreasing. After pre-treatment degreasing, neutralize it with glacial acetic acid at room temperature for 10 - 15 min and then dry it. Step S3, dyeing process: Use acid dyes to dye the dark-colored fabric to be dyed dark, and dye the light-colored fabric to be dyed white or leave it untreated according to needs. Step S4, fabric waterproof finishing process: Pre-dry the dyed fabric with hot air, prepare a finishing solution, put the fabric into the finishing solution for padding treatment, and perform baking treatment on the fabric after the padding treatment.

2. The dyeing and finishing process for improving the color migration fastness of nylon / ammonia fabric by waterproof finishing according to claim 1, characterized in that: The finishing solution in step S4 includes 2% - 4% o.w.f. fluorine-free waterproof agent, and the fluorine-free waterproof agent is an acrylic polyurethane type fluorine-free waterproof agent.

3. A dyeing and finishing process for improving the color migration fastness of nylon / ammonia fabric by waterproof finishing according to claim 1, characterized in that: The concentration of soda ash in step S2 is 1 - 2 g / L, and the concentration of glacial acetic acid is 0.3 - 0.6 g / L. The concentration of the degreasing agent in both step S1 and step S2 is 1 - 3 g / L.

4. A dyeing and finishing process for improving the color migration fastness of nylon / ammonia fabrics by waterproof finishing according to claim 1, characterized in that: Step S3 further includes: Step S31, dark color dyeing: Add acid metal dyes, glacial acetic acid, and acid leveling agent at room temperature, and raise the temperature to 97 - 99°C. Keep warm for 20 - 40 min. Step S32, dark color fixing: Add acid fixing agent and glacial acetic acid, and raise the temperature to 60 - 80°C. Keep warm for 20 - 40 min. Step S33, light color treatment: Add nylon brightening agent, glacial acetic acid, and acid leveling agent, and raise the temperature to 97 - 99°C. Keep warm for 15 - 25 min.

5. A dyeing and finishing process for improving the color migration fastness of nylon / ammonia fabric by waterproof finishing according to claim 4, characterized in that: The mass fraction of the acid metal dyes in step S31 is 2% - 4%, the concentration of glacial acetic acid is 0.5 - 1.5 g / L, and the concentration of the acid leveling agent is 0.1 - 0.5 g / L.

6. The dyeing and finishing process for improving the color migration fastness of nylon / ammonia fabric through waterproof finishing according to claim 4, characterized in that: The heating rate is 2°C / min for all.

7. A dyeing and finishing process for improving the color migration fastness of nylon / ammonia fabrics through waterproof finishing according to claim 4, characterized in that: The mass fraction of the acid fixing agent in step S32 is 3% - 5%, and the concentration of glacial acetic acid is 0.3 - 0.7 g / L.

8. A dyeing and finishing process for improving the color migration fastness of nylon / ammonia fabrics by waterproof finishing according to claim 4, characterized in that: The mass fraction of the nylon brightening agent in step S33 is 0.5% - 1.5%; the concentration of glacial acetic acid is 0.3 - 0.7 g / L, and the concentration of the acid leveling agent is 0.3 - 0.7 g / L.

9. A dyeing and finishing process for improving the color migration fastness of nylon-ammonia fabric by waterproof finishing according to claim 2, characterized in that: The padding rate of the finishing solution in step S4 is 73% - 77%. The finishing solution also includes 0.2% - 0.7% o.w.f. penetrant, the pH value of the finishing solution is 4.8 - 5.2, and the temperature of the finishing solution is 25 - 30°C.

10. A dyeing and finishing process for improving the color migration fastness of nylon / ammonia fabric by waterproof finishing according to claim 1, characterized in that: The hot air pre-drying further includes: pre-drying with a hot air dryer at a temperature of 130 to 160 °C for 75 to 85 s; the baking treatment is carried out by baking with a hot air stenter at a baking temperature of 165 to 175 °C for 75 to 85 s.

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