Dyeing and finishing process for improving moisture absorption and sweat releasing performance of knitted nylon-spandex fabric

Abstract

The invention relates to a dyeing and finishing process for improving moisture absorption and sweat releasing performance of a knitted chinlon-spandex fabric, which comprises the following steps: after the chinlon-spandex fabric is put into a cylinder, adding a pretreatment degreaser into the cylinder when the temperature in the cylinder is 40-50 DEG C, and heating to 95-100 DEG C for heat preservation; cooling to normal temperature after heat preservation is completed, draining water after pretreatment is completed, adding cold water for cleaning, and draining water; adding a dye and a dyeing assistant into the dye vat, adding a polyamide derivative in one bath, heating to 95-100 DEG C, carrying out heat preservation dyeing, cooling after heat preservation, draining water, washing with cold water for 1-2 times, washing after dyeing, heating, carrying out color fixation treatment, adding an organic acid and an anion color fixing agent, and carrying out heat preservation; after heat preservation is completed, the temperature is reduced to the normal temperature, the dye vat solution is discharged, and then water is fed for water washing and water discharging; and after color fixation and water washing, adding a moisture absorption and sweat releasing agent at normal temperature, heating to 60 DEG C, preserving heat, cooling and directly discharging with water. The problem that the moisture absorption and sweat releasing performance is reduced after the textile is washed can be solved, and the moisture absorption and sweat releasing washability of the textile is improved.

Description

Technical Field

[0001] The invention relates to the technical field of textiles, in particular to a dyeing and finishing process for improving the moisture absorption and perspiration discharge performance of knitted nylon-spandex fabrics. Background Art

[0002] Moisture wicking fabrics are mainly able to absorb moisture from the skin and evaporate it on the surface of the fabric, thus ensuring that the skin is dry. This kind of fabric is particularly suitable for people with vigorous metabolism and large amounts of sweat, as it can keep the skin's sweat pores unobstructed and meet metabolic needs. However, many of the moisture wicking fabrics on the market achieve this requirement by using additives for finishing.

[0003] Moisture wicking finishing is a process of moisture absorption-conduction-evaporation through fabrics that are in close contact with the skin. The water transfer process in the fabric generally consists of three steps: moisture absorption-diffusion-quick drying. The moisture wicking finishing of knitted nylon-spandex fabrics is generally achieved through moisture wicking agents.

[0004] Moisture absorption process: Moisture wicking aids introduce hydrophilic groups into fabric fibers, allowing the water vapor released by the human body to combine with the hydrophilic groups on the fibers in the shortest time, thereby completing the wetting and moisture absorption process.

[0005] Diffusion process: The process in which the moisture absorbed by the fabric diffuses from the inner surface to the outer surface of the fabric and the moisture absorption area of ​​the fabric gradually expands. It mainly relies on the capillary action of the internal structure of the fiber, and the hydrophilic groups on the fabric surface through the additives can also effectively increase its diffusion speed.

[0006] Quick-drying process: an evaporation process of the water on the fabric. The water absorbed by the fabric evaporates to the outer space to achieve the quick-drying process of the fabric. The hydrophilic group of the additive combines with the water molecules by ionic bonds. When the moisture in the outside world decreases, the water molecules will separate from the hydrophilic group in time and diffuse into the external space. The quick drying of the fabric is also completed in this process.

[0007] The main component of the moisture absorption and removal agent used for nylon is generally polyurethane, which self-crosslinks at high temperatures to form a hydrophilic film on the fiber surface to achieve good moisture absorption and quick-drying properties, but is not resistant to water washing.

[0008] As people's living standards are getting higher and higher, people's requirements for the quality of life are also getting higher and higher, and the requirements for textile absorption and perspiration testing are becoming more and more stringent. However, the moisture absorption and perspiration wicking agents used for general nylon will have the problem of washability, that is, after washing according to the test requirements, the moisture absorption and perspiration wicking agents will be washed off the fibers, which will reduce the moisture absorption and perspiration wicking performance and fail to meet the moisture absorption and perspiration test requirements. Summary of the invention

[0009] The purpose of the present invention is to provide a dyeing and finishing process for improving the moisture absorption and perspiration resistance of knitted nylon-spandex fabrics, which can solve the problem of reduced moisture absorption and perspiration resistance of textiles after washing, and increase the moisture absorption and perspiration resistance of the fabric without affecting the color fastness or the color.

[0010] To achieve the above object, the present invention provides the following technical solution: a dyeing and finishing process for improving the moisture absorption and perspiration wicking performance of knitted nylon-spandex fabrics, the dyeing and finishing process comprising the following steps:

[0011] Step S1, pre-dyeing treatment: after the nylon-spandex fabric is put into the vat, a pre-treatment degreasing agent is added into the vat when the water temperature in the vat is 40-50°C, the temperature is raised to 95-100°C, and the temperature is kept for 20-30 minutes. After the heat preservation is completed, the temperature is lowered to room temperature, and then the fabric is drained and washed with cold water, and then the fabric is drained again;

[0012] Step S2, dyeing: after the pretreatment is completed, dye and dyeing auxiliaries are added to the dyeing vat, polyamide derivatives are added to the same bath and the temperature is raised to 95-100°C, and the temperature is kept for 30 minutes. After the temperature is kept, the temperature is lowered to 45-55°C, and then drained and washed with cold water for 1 to 2 times;

[0013] Step S3, color fixing: after dyeing is completed and washed, the temperature is raised to 70-80°C for color fixing treatment, and organic acid and anionic color fixing agent are added and kept warm for 20-30 minutes; after the insulation is completed, the temperature is lowered to room temperature, the dye vat solution is discharged, and then water is added for washing and drainage;

[0014] Step S4, absorption and discharge treatment: After color fixing and washing, add moisture absorption and perspiration agent at room temperature, heat to 60°C and keep warm for 15-20 minutes, then cool to room temperature and take the water out of the tank directly.

[0015] Furthermore, the method further comprises step S5, post-setting: the post-setting temperature is 140-170° C., the vehicle speed is 20-40 m / min, and the moisture absorption and perspiration finishing and hand feel are performed by dipping and rolling to meet the process requirements and specifications.

[0016] Furthermore, the anionic color-fixing agent is 2-4% of the anionic color-fixing agent, the concentration of the organic acid is 0.5-1.5 g / L of organic acid, and the concentration of the moisture absorption and perspiration agent is 1-3 g / L.

[0017] Furthermore, the water washing operation in step S3 is to wash with water at room temperature for 10-15 minutes.

[0018] Furthermore, the knitted nylon-spandex fabric contains 69% nylon and 31% spandex.

[0019] Furthermore, the heating rate and the cooling rate in step S1 and step S4 are both 2° C. / min.

[0020] Furthermore, in step S2, the heating rate is 1.5°C / min, and the cooling rate is 1.5°C / min.

[0021] Furthermore, the polyamide derivative is 2-4% of a polyamide polyether derivative.

[0022] Beneficial effects of the present invention: Customers now have higher and higher requirements for moisture absorption and perspiration discharge, and more and more requirements for washing times, and the previous absorption and drainage process can no longer meet the current customer requirements. The difference between nylon fabrics and nylon-spandex fabrics is that there is more spandex, and nylon itself is hydrophilic. These absorption and drainage requirements are relatively easy to pass the test. However, after adding spandex to the blend, spandex itself is water-repellent. Therefore, the absorption and drainage of nylon-spandex fabrics is more difficult to test. The process of the present application can increase the washability of the fabric, and the process is more consistent with the traditional absorption and drainage dyeing and finishing process. No additional process is added, but it saves energy and consumption. While ensuring the high quality of the fabric surface, it also takes into account excellent color fastness, and effectively improves the problem that nylon-spandex knitted fabrics are not easy to pass the absorption and drainage test after washing. It does not affect the color fastness and the color, and increases the moisture absorption and perspiration washability of the fabric. And gives the nylon-spandex fabric a certain soft feel. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 This is a graph showing the moisture absorption and quick drying test results of GB / T 21655.2 standard for comparative example 1;

[0024] Figure 2 This is a graph showing the results of moisture absorption and perspiration test according to the moisture absorption and quick drying GB / T 21655.2 standard of the moisture absorption and perspiration dyeing and finishing process of the present invention;

[0025] Figure 3 This is a color fastness test report of the finished product of Comparative Example 1;

[0026] Figure 4 This is a test report diagram of the color fastness of the finished product according to the moisture absorption and perspiration dyeing and finishing process of the present invention. DETAILED DESCRIPTION

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

[0028] See also Figures 1 to 4 The present invention provides an embodiment: a dyeing and finishing process for improving the moisture absorption and perspiration wicking performance of knitted nylon-spandex fabrics, the dyeing and finishing process comprising the following steps:

[0029] Step S1, pre-dyeing treatment: after the nylon-spandex fabric is put into the vat, a pre-treatment degreasing agent is added into the vat when the water temperature in the vat is 40-50°C, the temperature is raised to 95-100°C, and the temperature is kept for 20-30 minutes. After the heat preservation is completed, the temperature is lowered to room temperature, and then the fabric is drained and washed with cold water, and then drained again; the pre-treatment before dyeing is indispensable, and the role of the pre-treatment is to change the surface tension of the fabric through a surfactant and improve the hydrophilicity of the fabric.

[0030] Step S2, dyeing: after the pretreatment is completed, dyes and dyeing auxiliaries are added to the dyeing vat, polyamide derivatives are added to the same bath and the temperature is raised to 95-100°C for heat preservation dyeing for 30 minutes. After the heat preservation is completed, the temperature is lowered; after cooling to 45-55°C, the water is drained and then washed with cold water for 1 to 2 times; polyamide derivatives are added to the same bath for dyeing in order to increase the wash-resistant hydrophilic properties of the nylon-spandex fabric.

[0031] Step S3, color fixing: after dyeing is completed and washed, the temperature is raised to 70-80°C for color fixing treatment, organic acid and anionic color fixing agent are added and kept warm for 20-30 minutes. After the insulation is completed, the temperature is lowered to room temperature, the dye vat solution is discharged, and then water is added for washing and drainage;

[0032] Step S4, moisture absorption and perspiration treatment: After color fixing and washing, add moisture absorption and perspiration removal agent at room temperature, heat to 60℃ and keep warm for 15-20 minutes, then cool to room temperature and take the fabric out of the vat directly. During color fixing, moisture absorption and perspiration removal treatment is performed in the same bath to further improve the hydrophilicity of the fabric and enhance the moisture absorption and perspiration removal effect.

[0033] Please continue reading Figures 1 to 4 As shown, in one embodiment of the present invention, step S5, post-setting is also included: the post-setting temperature is 140-170°C, the speed is 20-40m / min, and the moisture absorption and perspiration finishing is done by dipping and rolling to meet the process requirements. The purpose of post-setting moisture absorption and perspiration finishing is to further improve the hydrophilicity of the fabric surface and enhance the moisture absorption and perspiration effect.

[0034] Please continue reading Figures 1 to 4 As shown, in one embodiment of the present invention, the anionic color fixing agent is 2-4% of the anionic color fixing agent, the concentration of the organic acid is 0.5-1.5 g / L of organic acid, and the concentration of the moisture absorbing and perspiration releasing agent is 1-3 g / L.

[0035] Please continue reading Figures 1 to 4 As shown, in one embodiment of the present invention, the water washing operation in step S3 is to wash with water at room temperature for 10-15 minutes.

[0036] Please continue reading Figures 1 to 4As shown, in one embodiment of the present invention, the composition of the knitted nylon-spandex fabric is 69% nylon and 31% spandex. The nylon yarn structure contains amide hydrophilic groups, which is more hydrophilic than polyester yarn. Spandex yarn is not hydrophilic. The spandex-nylon interwoven fabric is different from the pure nylon fabric or spandex-polyester interwoven fabric in terms of moisture absorption and perspiration dyeing and finishing process.

[0037] Please continue reading Figures 1 to 4 As shown, in one embodiment of the present invention, the heating rate and the cooling rate in step S1 and step S4 are both 2° C. / min.

[0038] Please continue reading Figures 1 to 4 As shown, in one embodiment of the present invention, the heating rate in step S2 is 1.5°C / min, and the cooling rate is 1.5°C / min.

[0039] Please continue reading Figures 1 to 4 As shown, in one embodiment of the present invention, the polyamide derivative is a 2-4% polyamide polyether derivative. When the polyamide polyether derivative is added in the same bath during dyeing, the washing fastness is increased. While not affecting the color fastness, the color is not affected, and the moisture absorption and perspiration washing fastness and soft feel of the fabric are increased. Specific embodiment 1:

[0041] Pre-dyeing treatment: After the nylon-spandex fabric interwoven with 69% nylon and 31% spandex is put into the vat, 2g / L of pre-treatment degreasing agent is added at a temperature of 50°C to pre-treat the nylon-spandex fabric. The temperature is raised to 98°C at a rate of 2°C / min and kept warm for 20 minutes. After the insulation is completed, the temperature is lowered to room temperature at a rate of 2°C / min, and cold water is added to wash after drainage, and then drainage is carried out;

[0042] Dyeing: After pretreatment, add dyes and dyeing auxiliaries to the normal temperature dyeing vat, add 3% polyamide polyether derivatives to the same bath and heat to 98°C at a rate of 1.5°C / min for 30 minutes for dyeing. After the heat preservation is completed, cool down to 45°C at a rate of 1.5°C / min. After cooling, drain the water and then rinse with cold water for 1 to 2 times;

[0043] Fixation: After dyeing and washing, heat to 70℃ for fixation, add 1g / L organic acid and 3% anionic fixing agent, and keep warm for 30min. After the insulation is completed, cool to room temperature, drain the dye vat solution, then add water, wash, drain, and wash at room temperature for 10-15 minutes;

[0044] Absorption and drainage treatment: After color fixing and washing, add 2g / L of moisture absorption and perspiration agent at room temperature, heat up to 60℃ at a rate of 2℃ / min, keep warm for 20 minutes, then cool down to room temperature at a rate of 2℃ / min, and take it out of the tank directly with water after cooling down.

[0045] Post-setting: The post-setting temperature is 150℃, the speed is 30m / min, and the moisture absorption and perspiration finishing and hand feel are done by dipping and rolling to meet the process requirements and specifications.

[0046] Comparative Example 1:

[0047] Pretreatment is the same as in Example 1;

[0048] Dyeing: After pre-treatment, add dyes and dyeing auxiliaries into the normal temperature dyeing vat, heat it to 98℃ and keep it for 30 minutes, then drain it after cooling down, and then wash it with cold water;

[0049] Finishing: After washing the fabric, add 4g / L of color fixing agent to fix the color. After the color fixing is completed, wash it once, then add 2g / L of moisture absorption and perspiration removal agent and heat it to 45 degrees and keep it warm for 20 minutes. After the insulation is completed, cool it down to room temperature and directly take out the cloth with water without washing.

[0050] Finally, soak and press regularly to improve moisture absorption and perspiration finishing and hand feel.

[0051] In order to further illustrate the effects of the present invention, the fabrics of this embodiment and comparative example 1 were subjected to relevant tests, and the test results are shown as follows:

[0052] Figure 1 The results of the moisture absorption and quick drying test of Example 1 in accordance with the GB / T 21655.2 standard are shown in Table 1. It can be seen from the results of the moisture absorption and quick drying test that after five washes, the moisture absorption and quick drying properties are significantly reduced and fail to meet the requirements. (Note: One-way moisture conduction performance is not evaluated)

[0053] Figure 2 The test results of the moisture absorption and quick drying GB / T 21655.2 standard for the moisture absorption and perspiration dyeing and finishing process of the present invention are shown in the results of the moisture absorption and quick drying test. It can be seen from the test results that after 5 times of washing, the moisture absorption and quick drying properties are basically unchanged compared with those before washing, and can meet the test standard requirements. (Note: unilateral moisture conduction performance is not evaluated)

[0054] Figure 3 According to the color fastness test report of the finished product of Comparative Example 1, the color fastness is excellent.

[0055] Figure 4 It is a color fastness test report of the finished product of the moisture absorption and perspiration dyeing and finishing process according to the present invention, and the color fastness is excellent.

[0056] It can be seen from the test results that the moisture absorption and perspiration removal process of the present invention has significantly improved wash resistance compared with comparative example 1, and has no effect on color fastness.

[0057] The above description is only a preferred embodiment of the present invention and should not be construed as limiting the present application. All equivalent changes and modifications made within the scope of the patent application of the present invention should fall within the scope of the present invention.

Claims

1. A dyeing and finishing process for improving the moisture absorption and perspiration wicking performance of knitted nylon-spandex fabrics, characterized in that: The dyeing and finishing process comprises the following steps: Step S1, pre-dyeing treatment: after the nylon-spandex fabric is put into the vat, a pre-treatment degreasing agent is added into the vat when the water temperature in the vat is 40-50°C, the temperature is raised to 95-100°C, and the temperature is kept for 20-30 minutes. After the heat preservation is completed, the temperature is lowered to room temperature, and then the fabric is drained and washed with cold water, and then the fabric is drained again; Step S2, dyeing: after the pretreatment is completed, dye and dyeing auxiliaries are added to the dyeing vat, polyamide derivatives are added to the same bath and the temperature is raised to 95-100°C for heat preservation and dyeing for 30 minutes. After the heat preservation is completed, the temperature is lowered; after the temperature is lowered to 45-55°C, the water is drained and then washed with cold water for 1 to 2 times; Step S3, color fixing: after dyeing is completed and washed, the temperature is raised to 70-80°C for color fixing treatment, organic acid and anionic color fixing agent are added and kept warm for 20-30 minutes. After the insulation is completed, the temperature is lowered to room temperature, the dye vat solution is discharged, and then water is added for washing and drainage; Step S4, absorption and discharge treatment: After color fixing and washing, add moisture absorption and perspiration agent at room temperature, heat to 60°C and keep warm for 15-20 minutes, then cool to room temperature and take the water out of the tank directly.

2. A dyeing and finishing process for improving the moisture absorption and perspiration wicking performance of knitted nylon-spandex fabric according to claim 1, characterized in that: The step S5 is also included, post-setting: the post-setting temperature is 140-170°C, the vehicle speed is 20-40m / min, and the moisture absorption and perspiration finishing and hand feel are performed by dipping and rolling to meet the process requirements and specifications.

3. The dyeing and finishing process for improving the moisture absorption and perspiration wicking performance of knitted nylon-spandex fabric according to claim 1, characterized in that: The anionic color-fixing agent is 2-4% of the anionic color-fixing agent, the concentration of the organic acid is 0.5-1.5 g / L of organic acid, and the concentration of the moisture absorption and perspiration-releasing agent is 1-3 g / L.

4. A dyeing and finishing process for improving the moisture absorption and perspiration wicking performance of knitted nylon-spandex fabric according to claim 1, characterized in that: The water washing operation in step S3 is to wash with water at room temperature for 10-15 minutes.

5. The dyeing and finishing process for improving the moisture absorption and perspiration wicking performance of knitted nylon-spandex fabric according to claim 1, characterized in that: The knitted nylon-spandex fabric contains 69% nylon and 31% spandex.

6. The dyeing and finishing process for improving the moisture absorption and perspiration wicking performance of knitted nylon-spandex fabric according to claim 1, characterized in that: The heating rate and cooling rate in step S1 and step S4 are both 2° C. / min.

7. The dyeing and finishing process for improving the moisture absorption and perspiration wicking performance of knitted nylon-spandex fabric according to claim 1, characterized in that: The heating rate in step S2 is 1.5°C / min, and the cooling rate is 1.5°C / min.

8. The dyeing and finishing process for improving the moisture absorption and perspiration wicking performance of knitted nylon-spandex fabric according to claim 1, characterized in that: The polyamide derivative is 2-4% of a polyamide polyether derivative.

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