Anti-ultraviolet dyeing one-bath process production process for fine denier nylon fabric

Abstract

The invention discloses an anti-ultraviolet dyeing one-bath process production process for a fine denier nylon fabric. The anti-ultraviolet dyeing one-bath process production process comprises pretreatment, anti-ultraviolet / dyeing one-bath process treatment, fixation treatment and fluoride-free waterproof setting treatment, padding the cold batch treatment liquid for cold batch treatment; adding an acid leveling agent, then adding an acid dye and an anti-ultraviolet finishing agent, then setting a heat preservation section at three set temperatures, heating to a final set temperature, and keeping the temperature; adding glacial acetic acid and an acidic color fixing agent, heating to a color fixing temperature, keeping the temperature, cooling and discharging water; the cold batch treatment liquid comprises ionic membrane alkali, Irvite SYN, Irvite CS, a degreaser DFL and hydrogen peroxide. An anti-ultraviolet dyeing one-bath processing technology is adopted, so that the production cost is reduced, and the production efficiency is improved; the penetrating agent and the cross-linking agent enable the waterproof auxiliary agent to be fully combined with the fiber, a film formed on the surface of the fiber is firmer, and the product has repeated washing resistance, so that the product finally reaches the grade 5 before washing and still reaches the grade 3 or more after being washed for 50 times, and the product achieves the environment-friendly target.

Description

Technical Field

[0001] This invention relates to a one-bath process for UV-resistant dyeing of fine denier nylon fabric, belonging to the field of one-bath process production technology for dyeing and finishing of nylon fabric. Background Technology

[0002] Nylon, chemically known as polyamide fiber, is the first fiber in human history to be entirely synthetically produced. Its structure, characterized by macromolecular chains linked end-to-end by amide bonds (-CONH-), forms a helical structure that endows it with exceptional physical properties: its abrasion resistance is 10 times that of cotton fiber, and its wet modulus is 140 times that of viscose fiber. It maintains good fatigue resistance in extreme environments, such as high and ultra-low temperatures, and has wide applications in aerospace and military fields.

[0003] In terms of fiber properties, fine denier nylon fibers, due to their fineness, low bending modulus, and low stiffness, exhibit a more fluffy distribution and a softer feel compared to ordinary fibers. Refining nylon improves the diffuse reflection properties of fabrics, resulting in a softer surface luster, while also enhancing the silk-like effect and drape, making it suitable for high-end evening gowns or knitwear. When used in outdoor fabrics, the application of fine denier fibers increases the number of fibers per unit area, making the fabric denser and improving wind and UV protection. Furthermore, the high specific surface area, small diameter, and high porosity of fine denier nylon overcome the shortcomings of synthetic fiber fabrics, which tend to be less breathable, thus improving the fabric's performance in clothing.

[0004] Currently, the main applications of fine denier fibers are as follows: in textiles, they are used in imitation silk products, outdoor fabrics, and artificial fur; they are also used in filter materials, liquid storage materials, thermal insulation, and aerospace materials. In the common textile and apparel industry, the future market for clothing and accessories is always trending towards smaller total fabric fineness or smaller single filament fineness. Fine denier fabrics have considerable advantages and a promising future.

[0005] Ultraviolet (UV) radiation consists of high-energy photons with wavelengths between 10 nm and 400 nm, invisible to the naked eye. When fabrics absorb enough energy, it breaks the chemical bonds in the material or fibers, leading to changes in the material's physicochemical properties, appearance, and performance, and in severe cases, material failure. As an electromagnetic wave, UV radiation has varying degrees of impact depending on its wavelength due to its high energy and penetrability. Excessive exposure to medium-wave UV radiation can cause vasodilation, skin darkening, and premature aging, and is a major cause of sunburn. Lower wavelength UV radiation can even cause gene mutations in organisms, inducing diseases such as skin cancer and tumors. Plant cells can be affected, leading to reduced yields or even death. It is highly harmful, and although the amount of UV radiation reaching the ground is small, the long-term effects of outdoor activities should not be underestimated. People have gradually come to understand the dangers of UV radiation and have begun research into UV-protective products.

[0006] Nylon fiber's inherent UV resistance is slightly inferior to that of polyester, another synthetic fiber. It often requires functional group modification or the addition of nanomaterials to meet clothing requirements. However, influenced by mainstream weaving styles, outdoor fabrics are trending towards lighter weight and greater functionality. With the increasing availability of UV-resistant fabrics on the market, light-colored, thin fabrics have always struggled to meet customer UV resistance requirements. Even after UV-resistant finishing, they often fail to meet even the lowest UV resistance standards. For example, low-density 20D nylon fabrics rarely achieve a UPF of 30+, and even 20+ is difficult to achieve.

[0007] Because acidic or neutral dyes are commonly used for dyeing nylon fabrics, and these dye molecules contain anionic polar groups such as sulfonic acid groups and carboxylic acid groups, they easily electrolyze in water to form sodium salts. These sodium salts then ionize with the cationic polar groups formed by the amide groups and terminal amino groups in nylon fibers under acidic conditions. However, most household detergents are alkaline. During daily washing, the ionic bonds between the dye and nylon are easily broken in an alkaline environment, and the binding force between the dye and the fiber is less than the affinity between the dye and water. Ultimately, the dye ionizes and detaches from the fabric, resulting in poor color fastness to soaping and staining. Therefore, fixing agents are often needed to fix the color and improve the color fastness of the finished nylon fabric in various wet treatments. Currently, most commercially available acidic fixing agents are phenolic resin type fixing agents containing sulfonic acid groups. Furthermore, phenolic resins are mostly synthesized from bisphenol compounds. Bisphenols pose potential harm to the human endocrine and reproductive systems. They can mimic hormones such as estrogen, blocking hormone receptors from receiving hormones normally, potentially inducing breast cancer, male infertility, precocious puberty in girls, diabetes, and obesity. Furthermore, they may increase the risk of diseases such as ovarian cancer, prostate cancer, and leukemia. Outdoor fabrics, due to prolonged contact during wear, are easily absorbed through the skin via the extraction and evaporation of sweat, eventually entering the capillary system and circulating throughout the body, negatively impacting health. Therefore, in addition to meeting people's requirements for colorfastness and color retention in fabrics, there is a need to improve the environmental and safety performance of clothing.

[0008] In textile finishing, waterproofing is the process of transforming the surface of a fabric from hydrophilic to hydrophobic. A common method involves adding hydrophobic compound auxiliaries to the finishing bath of a setting machine. After padding and drying, under high temperature and hot air, the waterproofing agent deposits on the hydrophobic ends of the fibers. The waterproofing agent can self-link to form a thin and dense film on the fabric surface. Depending on the type of fiber, some waterproofing agents can bind to surface-active groups such as amide groups and hydroxyl groups, while others adhere to the fiber surface through hydrogen bonds and van der Waals forces. Ultimately, this reduces the surface tension of the yarn, giving the fabric a hydrophobic surface while maintaining its original performance characteristics; this is called waterproofing. Currently, there are no effective methods worldwide to address the potential viral accumulation of perfluorooctane sulfonyl compounds (PFOS) and perfluorooctanoic acid (PFOA) in fluorocarbon waterproofing agents, as well as their impact on the ecological environment. Therefore, the use of fluorine-free waterproofing agents is required. Textile products using fluorine-free waterproofing finishes will gain increasing market acceptance. Gradually improving the waterproofness and washability of fluorine-free waterproofing agents will be the future development trend of waterproofing agents. Currently, there are still some technical challenges in achieving multiple washes of fluorine-free waterproofing. For example, the performance of fluorine-free waterproofing agents cannot be matched by fluorine-containing waterproofing agents with the same dosage, and increasing the dosage may lead to issues such as white marks from hand scratches and poor hand feel. In addition, for waterproofing nylon fabrics, the bonding method between the waterproofing agent and nylon fibers, and the choice of different types of fluorine-free waterproofing agents, will affect the waterproofing effect of the fabric after washing. In actual clothing scenarios, whether the fabric can maintain good waterproofing performance after multiple simulated washing processes is an important indicator of the fabric's waterproofing performance. This is because the washing process is prone to stretching and friction under the mechanical action of external forces, which can cause irreversible damage to the hydrophobic film formed by the waterproofing agent on the fabric surface. Furthermore, the washing environment has the combined effects of temperature and detergent, which may cause the waterproofing agent to become unstable in its bond with the fibers after the fabric is heated. In addition, detergents and their surfactants (the main factors affecting the waterproofing effect) can easily reduce the waterproofing effect, leading to the breakage of the bond between the waterproofing agent and the fiber, and an incomplete hydrophobic film on the fiber surface. Ultimately, this results in a decrease in the waterproofing performance of the fabric, and the waterproofing performance of the fabric becomes worse with each wash. To maximize the preservation of the waterproof properties of fabrics after washing, it is necessary to consider factors such as the type of waterproofing agent, the amount of crosslinking agent used, and the degree of crosslinking under different finishing process parameters.

[0009] Therefore, the problem to be solved is how to research and develop a production process that uses fine denier nylon fiber as raw material and adopts a one-bath method of UV-resistant dyeing to prepare a fluorine-free waterproof product with multiple wash resistance. Summary of the Invention

[0010] The purpose of this invention is to provide a one-bath process for UV-resistant dyeing of fine denier nylon fabric. The process involves one-bath UV-resistant dyeing followed by fluorine-free waterproof finishing, resulting in high color fastness, UV resistance, and waterproof performance that withstands multiple washes.

[0011] To solve the above-mentioned technical problems, the objective of this invention is achieved as follows: The present invention relates to a one-bath process for UV-resistant dyeing of fine denier nylon fabric, comprising the following steps: S1. Pretreatment: The fine denier nylon fabric is impregnated with cold padding treatment solution and cold padding treatment is performed in roll form. Then, the fabric after cold padding is washed with water in a flat desizing machine. S2, UV protection / dyeing one-bath treatment: Transfer the fabric treated in the previous step into the dyeing equipment, add acidic leveling agent at the initial water temperature, and add acidic dye and UV protection finishing agent after the operation is smooth. Then set the heat preservation section in three temperature ranges: the first set temperature, the second set temperature and the third set temperature, then raise the temperature to the final set temperature and hold it for a certain time, and then cool down. S3. Fixing treatment: After the previous step is completed, continue to add glacial acetic acid and acidic fixing agent into the dyeing equipment, raise the temperature to the fixing temperature and maintain it for a certain time to fix the color, and then cool down and drain the water. S4. Shaping treatment: The fabric after color fixing is fluorine-free waterproof shaping is performed using a shaping machine. In step S1, the cold reactor treatment liquid includes ion-exchange membrane alkali, Yanweite SYN, Yanweite CS, degreasing agent DFL, and hydrogen peroxide.

[0012] Based on the above scheme and as a preferred embodiment of the above scheme: the desizing treatment liquid includes 33-ion membrane alkali, long-car desizing agent and chelating dispersant.

[0013] Based on the above scheme and as a preferred embodiment of the above scheme: the first set temperature is 50℃, the second set temperature is 65℃, the third set temperature is 85℃; the final set temperature is 105℃, and the holding time is 60min.

[0014] Based on the above scheme and as a preferred embodiment of the above scheme: the time of the moisturizing segment is 5-10 minutes.

[0015] Based on the above scheme and as a preferred embodiment of the above scheme: in step S3, the color fixing temperature is 80°C and the holding time is 30 min.

[0016] Based on the above scheme and as a preferred embodiment of the above scheme: the waterproofing treatment liquid used in the fluorine-free waterproofing molding process includes a fluorine-free waterproofing agent, a crosslinking agent, and a penetrant.

[0017] Based on the above scheme and as a preferred embodiment of the above scheme: in step S1, the rolling liquid pressure during immersion rolling is 0.3-0.4MPa, and the temperature of the rolling groove is 40℃; the tensioning frame pressure during coiling is 0.35-0.45MPa, and the cold stacking time is 48h.

[0018] Based on the above scheme and as a preferred option, the rolling mill pressure during the desizing treatment is 0.3-0.4 MPa, the temperature of the desizing tank is 80-95℃, and the temperature of the washing tank is 50-60℃.

[0019] The beneficial effects of this invention are as follows: The one-bath process for UV-resistant dyeing of fine denier nylon fabric involved in this invention reduces production costs and improves production efficiency. Simultaneously, while ensuring UV performance, the one-bath dyeing process eliminates the need for UV-resistant auxiliaries in the setting stage, avoiding the production risk of sharing setting UV-resistant auxiliaries with waterproofing auxiliaries, and reducing auxiliary cost. Furthermore, the nylon produced under the new process design also exhibits good wash resistance under UV conditions. The compounding of penetrants and crosslinking agents allows the waterproofing auxiliaries to bond more fully with the fibers, forming a stronger film on the fiber surface and providing multiple wash resistance. This results in a product that ultimately achieves a pre-wash rating of 5 and retains a rating of 3 or higher after 50 washes, a leading level in the industry. While enhancing waterproof performance, the new process ensures that the product does not contain harmful perfluorinated substances such as PFOS and PFOA, achieving environmental protection goals. Detailed Implementation

[0020] The present invention will be further described below with reference to specific embodiments.

[0021] The dyes and auxiliaries used in this invention are as follows: B-NS Acid Blue dye (industrial grade, Zhejiang Mingyi New Energy Co., Ltd.), B-NS Acid Yellow dye (industrial grade, Zhejiang Mingyi New Energy Co., Ltd.), B-NS Acid Red dye (industrial grade, Zhejiang Mingyi New Energy Co., Ltd.); 32-ion membrane alkali (industrial grade, Jiangsu Suhua Group Co., Ltd.), Yanweite SYN (industrial grade, Huntsman Chemical Trading (Shanghai) Co., Ltd.), hydrogen peroxide (industrial grade, Wujiang Guangda Textile Co., Ltd.), oxygen bleaching stabilizer GEO (industrial grade, Tuona Trading (Shanghai) Co., Ltd.), glacial acetic acid; acidic leveling agent TF-217B (industrial grade, Transfar Group Co., Ltd.), UV-resistant finishing agent TF-6165B (industrial grade, Transfar Group Co., Ltd.); acidic fixing agent TF-506N (industrial grade, Transfar Group Co., Ltd.); fluorine-free waterproofing agent XF-5007 (industrial grade, Transfar Group Co., Ltd.), crosslinking agent XCR (industrial grade, Rudolf Chemical Co., Ltd.), penetrant BG-2 (industrial grade).

[0022] The instruments used in this invention are: QDLMH035B-200 liquid coating machine (Jiangyin Qiangda Machinery Manufacturing Co., Ltd.), OS-2008 flat desizing machine (Hongrong Dyeing and Finishing Machinery Co., Ltd.), ASIA-SF-2-500KG high-temperature and high-pressure overflow dyeing machine without guide rollers (Zhejiang Yadong Machinery Co., Ltd.), ZSH-1800 fully automatic dewatering machine (Wuxi Qianzhou Huanyu Machinery Factory), SD124A open-width dewatering machine (Jiangyin Qiangda Machinery Manufacturing Co., Ltd.), and MEGATE-Ⅲ intelligent setting machine (Meiguangda Intelligent Machinery Equipment (Suzhou) Co., Ltd.).

[0023] Example 1 The present embodiment relates to a one-bath process for UV-resistant dyeing of fine denier nylon fabric, which includes the following steps: S1 pretreatment, S2 UV-resistant / dyeing one-bath treatment, S3 color fixing treatment, and S4 setting treatment.

[0024] In step S1 pretreatment, the fine denier nylon fabric is impregnated with cold padding treatment liquid and cold padding is performed in roll form. Then, the fabric impregnated with cold padding desizing treatment liquid is washed in a flat width using a flat width desizing machine.

[0025] The fine denier nylon fabric used is a 30D nylon spun fine denier nylon fabric. The greige width is 162cm, the greige weight per square meter is 65g / m, the warp and weft are 30D semi-dull filament FDY nylon, the weave structure is twill, the warp density is 78.5 T / cm, and the weft density is 53 T / cm.

[0026] The nylon fabric was first soaked in a cold piling treatment solution of a certain mass concentration using a QDLMH035B-200 type liquid coating machine at room temperature. Then, the fabric after soaking in the cold piling treatment solution was placed in a roll with an outer film and placed on a rotating device for cold piling treatment. After piling for 48 hours, it was then cleaned horizontally and on the fabric surface using a related OS-2008 type flat desizing machine.

[0027] The cold stack treatment solution comprises 4.5% 32-ion-exchange membrane alkali, 2.0 g / L of Yanweite SYN, 2.5 g / L of Yanweite CS, 2.0 g / L of degreasing agent DFL, and 2.5 g / L of hydrogen peroxide. The specific process parameters during rolling are: rolling fluid pressure of 0.3 MPa, rolling groove temperature of 40°C; coil tensioner pressure of 0.45 MPa, and cold stack time of 48 h.

[0028] The desizing solution used in desizing includes 4.0% ion-exchange membrane alkali, 2.5 g / L of long-roller desizing agent TF-127A, and 2.0 g / L of chelating dispersant TF-1337F. The specific process parameters for desizing are: rolling mill pressure of 0.40 MPa, desizing tank temperature of 80℃, washing tank temperature of 60℃, and rolling speed of 60 m / min.

[0029] During the weaving process on the loom, fabrics undergo approximately 2000-3000 cycles of repeated stretching, bending, and abrasion at varying degrees. Therefore, without sizing, the warp yarns are prone to fuzziness, insufficient fiber cohesion, and breakage under complex mechanical forces. Fuzzy yarns can also cause warp yarns to stick together, resulting in unclear weaving and defects. Therefore, sizing is usually necessary to ensure smooth weaving. Furthermore, oils used in chemical fiber spinning and polymerization, as well as stains and mildew formed during transportation and storage, also require treatment during the dyeing and finishing process to ensure the quality of subsequent fabric processing. The Yanweite SYN, Yanweite CS, and hydrogen peroxide used in this section not only exhibit excellent alkali resistance under optimized process conditions but also, in synergy with sodium hydroxide solution, effectively remove oils, sizing agents, stains, and mildew from the fabric surface, thus ensuring the smooth progress of the next process. At the same time, the cold-batch-OS flat-width water washing pretreatment process is selected. Compared with the traditional pretreatment desizing method, the cold-batch process is carried out under fixed temperature and humidity, which makes the desizing more thorough and is more conducive to the full application of acid dyes and ultraviolet auxiliaries in the subsequent dyeing process.

[0030] In step S2, the UV protection / dyeing one-bath treatment, the fabric treated in the previous step is transferred to the dyeing equipment. An acidic leveling agent is added at the initial water temperature. After the process runs smoothly, acidic dyes and UV protection finishing agents are added separately. Then, three temperature settings are set: a first set temperature, a second set temperature, and a third set temperature. The temperature is then raised to the final set temperature and held for a certain time, followed by cooling. The first set temperature is 50℃, the second set temperature is 65℃, and the third set temperature is 85℃; the final set temperature is 105℃, and the holding time is 60 minutes.

[0031] The equipment used was an ASIA-SF-2-500KG high-temperature, high-pressure overflow dyeing machine without guide rollers. The liquor ratio during dyeing was 1:15, the amount of acidic leveling agent was 0.8 g / L, and the pH value was adjusted to 5.0-5.5 with acetic acid. A set ratio of acidic dye and UV stabilizer was used. In this embodiment, the acidic dye used was B-NS acid blue dye, specifically at 3.0% owf. The amount of UV stabilizer was 5.0% owf. Of course, the amount of acidic dye can be adjusted according to the actual color depth.

[0032] After pretreatment, the dyeing process includes the application of UV auxiliaries, and the conventional nylon dyeing temperature is increased from 98℃ to 105℃. This allows the nylon fibers to further shrink their structure, increasing their UV shielding effect, and also allows the UV auxiliaries to bond more tightly with the fibers, improving their UV resistance. A leveling agent is added at the initial water temperature, and after smooth operation, acid dyes and UV-resistant finishing agent TF-6165B are added separately. Subsequently, temperature holding intervals are set at 50℃, 65℃, and 85℃, with the dyeing process heating rate controlled at 0.6-0.7℃ / min to ensure sufficient dye uptake and transfer of the acid dyes, improving the color uniformity and overall dyeing performance of the fabric. The new UV-resistant dyeing-dyeing-same-bath method was compared with the two-bath method. The test results for different dyes in terms of color yield, color saturation value and color fastness were basically consistent. The UV resistance performance of the same-bath method was better than that of the two-bath method. In actual factory production, this process can shorten the overall process time and avoid the energy waste caused by repeated rinsing after dyeing. This comprehensively demonstrates the feasibility and advanced nature of the UV-resistant dyeing-same-bath method.

[0033] The specific heating process is as follows: add the auxiliaries, dyes and UV stabilizers at room temperature, and heat to 50°C at a heating rate of 0.7°C / min and hold for 10 min; then heat to 65°C at a heating rate of 0.6°C / min and hold for 10 min; then heat to 85°C at a heating rate of 0.6°C / min and hold for 5 min; then heat to 105°C at a heating rate of 0.7°C / min and hold for 60 min; and then cool down to 40°C.

[0034] In step S3, the color-fixing treatment, after the previous step, glacial acetic acid and an acidic color-fixing agent are added to the dyeing equipment at 40°C, and the temperature is raised to the color-fixing temperature and maintained for a certain time for color fixation, followed by cooling and rinsing. Specifically, the temperature is raised to 80°C and maintained for 30 minutes, and then cooled and rinsed at a rate of 1.5°C / min.

[0035] After the UV-resistant dyeing process in the same bath, a further color-fixing treatment is performed in the vat. Utilizing the effects of glacial acetic acid and the color-fixing agent, the agent forms a network copolymer structure on the surface of the dye-nylon fiber, coating the fiber surface to form a film. This effectively prevents acidic dyes from detaching or leaching from the fiber during subsequent color fastness testing and finished product use, thus preventing color changes and poor fastness. Simultaneously, setting the color-fixing temperature to 80℃ and the fixing time to 30 minutes during this stage further ensures a sufficient reaction and improves the actual color-fixing effect.

[0036] In step S4, the fabric after color fixing is first dehydrated, opened, and dried. The MEGATE-Ⅲ intelligent setting machine is used for setting and drying at a temperature of 160℃, a speed of 60m / min, and an opening width of 148-150cm. Then, the dried fabric is subjected to fluorine-free waterproof setting as required. The waterproofing solution used in the fluorine-free waterproof setting includes 40g / L of fluorine-free waterproofing agent XF-5007, 15g / L of crosslinking agent XCR, and 5g / L of penetrant BG-2. The temperature for the fluorine-free waterproof setting is 170℃, the speed is 45m / min, and the width is 148-150cm.

[0037] Based on the end customer's requirements for multiple washes of fluorine-free waterproofing, and to ensure the uniform distribution of various auxiliaries during the waterproofing stage and the stability of overall color and performance, a two-stage setting process is adopted in the setting stage: first setting and drying, followed by fluorine-free waterproofing setting. Firstly, in the setting and drying stage, according to the characteristics of different nylon fibers, a speed of 55-60 m / min is selected for heat treatment at 160℃ on the setting machine. Under the stretching action of the needle plates on both sides of the setting machine, the high-temperature thermal environment not only effectively dries the fabric but also improves its orientation, making the fabric smoother and effectively eliminating various crease problems. It also thoroughly removes free and bound water from the fibers, facilitating subsequent waterproofing finishing.

[0038] In the fluorine-free, high-water-resistance setting process, 50g / L of fluorine-free waterproofing agent XF-5007 is selected. This agent forms a mesh structure on the fabric surface, reducing surface tension and thus providing waterproofing. A 10-15g / L crosslinking agent XCR is added to enhance the stability of the crosslinking structure between the waterproofing agent and the fiber surface, resulting in multiple wash resistance. Additionally, 5g / L of penetrant BG-2 is added to improve the penetration of the waterproofing agent and crosslinking agent into the fabric, ensuring a stronger overall effect of the additives on the fiber structure. The setting temperature is set at 170℃, and the machine speed at 50m / min. Compared to the drying process, this slightly higher setting temperature and lower speed allow the fabric to spend a longer time in the setting machine oven, fully enabling the mesh structure to recombine and bond, resulting in a more stable fiber-waterproof structure and significantly improved waterproofing performance.

[0039] The color fastness of the finished product was tested in accordance with the following standards: "Color fastness to soap washing" (GB / T 3921-2008), "Color fastness to rubbing" (GB / T 3920-2024), "Color fastness to perspiration" (GB / T 3922-2013), "Color fastness to water" (GB / T 5713-2013), and "Color fastness to washing liquid" (visual rating method) (T / JSFZXH 022—2024).

[0040] The UV protection performance of finished products was tested in accordance with the "Evaluation of UV Protection of Textiles" (GB / T 18830-2009).

[0041] The waterproof performance of the finished product was tested according to the "Determination of Moisture Resistance of Fabrics" (GB / T 4745-2012) (washing program: 4N / 40℃, drying program: drum drying).

[0042] The environmental indicators of the finished products were tested in accordance with GB / T 41531-2022 "Determination of Phenol and Bisphenol A in Textiles" (GB / T 41531-2022) (HPLC / DAD test method) and "Test of PFOS and PFOA Content in Textiles and Coating Materials" (LC / MS / MC method, ultrasonic extraction method with organic solvents).

[0043] The measurement results of the nylon fabric prepared in Example 1 are shown in the table below: As can be seen from the table above, the nylon fabric prepared in this embodiment has good color fastness, UV protection and waterproof effect.

[0044] Example 2 The one-bath process for UV-resistant dyeing of fine denier nylon fabric involved in this embodiment differs from that in Embodiment 1 in that: The nylon fabric used is: 15D nylon spun fine denier fabric, with a white width of 166cm and a white weight of 56g / m². It is made of 15D semi-dull filament FDY nylon in both warp and weft directions, with a plain weave structure, a warp density of 100 T / cm, and a weft density of 85 T / cm.

[0045] In step S1, the cold stack treatment solution includes 4.0% 32-ion-exchange membrane alkali, 2.5 g / L of Yanweite SYN, 2.0 g / L of Yanweite CS, 2.5 g / L of degreasing agent DFL, and 2.0 g / L of hydrogen peroxide. The specific process parameters during rolling are: rolling liquid pressure of 0.4 MPa, rolling groove temperature of 40°C; coil tensioner pressure of 0.35 MPa, and cold stack time of 48 h.

[0046] In step S2, the dye used is B-NS acid yellow dye.

[0047] The desizing solution used in desizing includes 4.0% ion-exchange membrane alkali, 2.5 g / L of long-roller desizing agent TF-127A, and 2.0 g / L of chelating dispersant TF-1337F. The specific process parameters for desizing are: rolling mill pressure of 0.40 MPa, desizing tank temperature of 80℃, washing tank temperature of -60℃, and rolling speed of 60 m / min.

[0048] In step S4, the fabric after color fixing is first dehydrated, opened, and dried. The MEGATE-Ⅲ intelligent setting machine is used for setting and drying at a temperature of 160℃, a speed of 60m / min, and an opening width of 148-150cm. Then, the dried fabric is subjected to fluorine-free waterproof setting as required. The waterproofing solution used in the fluorine-free waterproof setting includes 50g / L of fluorine-free waterproofing agent XF-5007, 10g / L of crosslinking agent XCR, and 5g / L of penetrant BG-2. The temperature for the fluorine-free waterproof setting is 170℃, the speed is 50m / min, and the width is 148-150cm.

[0049] The measurement results of the nylon fabric prepared in Example 2 are shown in the table below: Example 3 The one-bath process for UV-resistant dyeing of fine denier nylon fabric involved in this embodiment differs from that in Embodiment 1 in that: The nylon fabric used is a double-layer nylon fabric: 20D nylon spun fine denier double-layer fabric. The width of the greige is 158cm, the weight per square meter of the greige is 135g / m, the warp and weft are 20D semi-dull FDY nylon, the structure is a double-layer plain weave structure with knotted weft, the single-layer density is 71 T / cm for warp and 45 T / cm for weft.

[0050] In step S1, the cold stack treatment solution includes 4.2% 32-ion-exchange membrane alkali, 2.3 g / L of Yanweite SYN, 2.3 g / L of Yanweite CS, 2.3 g / L of degreasing agent DFL, and 2.3 g / L of hydrogen peroxide. The specific process parameters during rolling are: rolling liquid pressure of 0.35 MPa, rolling groove temperature of 40°C; coil tensioner pressure of 0.40 MPa, and cold stack time of 48 h.

[0051] In step S2, the dye used is B-NS acid red dye.

[0052] The desizing solution used in desizing includes 4.2% ion-exchange membrane alkali, 2.3 g / L of long-roll desizing agent TF-127A, and 2.3 g / L of chelating dispersant TF-1337F. The specific process parameters for desizing are: rolling mill pressure of 0.35 MPa, desizing tank temperature of 88℃, washing tank temperature of 55℃, and rolling speed of 60 m / min.

[0053] In step S4, the fabric after color fixing is first dehydrated, opened, and dried. The MEGATE-Ⅲ intelligent setting machine is used for setting and drying at a temperature of 160℃, a speed of 58m / min, and an opening width of 148-150cm. Then, the dried fabric is subjected to fluorine-free waterproof setting as required. The waterproofing solution used in the fluorine-free waterproof setting includes 45g / L of fluorine-free waterproofing agent XF-5007, 13g / L of crosslinking agent XCR, and 5g / L of penetrant BG-2. The temperature for the fluorine-free waterproof setting is 170℃, the speed is 48m / min, and the width is 148-150cm.

[0054] The measurement results of the nylon fabric prepared in Example 3 are shown in the table below: The UV-resistant dyeing process developed in this application, taking Example 1 as an example, is compared with the conventional two-bath production process. The relevant energy consumption is shown in the table below: As shown in the table above, compared to the conventional two-bath process of UV protection and dyeing, the water consumption per kilometer is 40.72 tons, while the UV protection and dyeing single-bath process consumes only 28.50 tons, saving 30%. The electricity consumption per kilometer is 192.85 kW·h for the conventional method and 106.08 kW·h for the UV protection and dyeing single-bath process, saving 45%. The steam consumption per kilometer is 0.64 tons for the conventional method and 0.38 tons for the UV protection and dyeing single-bath process, saving 40%. Even with a rough estimate, the UV protection and dyeing single-bath process can save more than 30% of energy compared to the UV protection and dyeing two-bath process.

[0055] The preferred embodiments of the present invention have been described in detail above. It should be understood that those skilled in the art can make numerous modifications and variations based on the concept of the present invention without creative effort. Therefore, all technical solutions that can be obtained by those skilled in the art based on the concept of the present invention through logical analysis, reasoning, or limited experimentation on the basis of existing technology should be within the scope of protection defined by the claims.

Claims

1. A one-bath process for UV-resistant dyeing of fine denier nylon fabric, characterized in that, Includes the following steps: S1. Pretreatment: The fine denier nylon fabric is impregnated with cold padding treatment solution and cold padding treatment is performed in roll form. Then, the fabric after cold padding is washed with water in a flat desizing machine. S2, UV protection / dyeing one-bath treatment: Transfer the fabric treated in the previous step into the dyeing equipment, add acidic leveling agent at the initial water temperature, and add acidic dye and UV protection finishing agent after the operation is smooth. Then set the heat preservation section in three temperature ranges: the first set temperature, the second set temperature and the third set temperature, then raise the temperature to the final set temperature and hold it for a certain time, and then cool down. S3. Fixing treatment: After the previous step is completed, continue to add glacial acetic acid and acidic fixing agent into the dyeing equipment, raise the temperature to the fixing temperature and maintain it for a certain time to fix the color, and then cool down and drain the water. S4. Shaping treatment: The fabric after color fixing is fluorine-free waterproof shaping is performed using a shaping machine. In step S1, the cold reactor treatment liquid includes 32-ion membrane alkali, Yanweite SYN, Yanweite CS, degreasing agent DFL, and hydrogen peroxide.

2. The one-bath process for UV-resistant dyeing of fine denier nylon fabric according to claim 1, characterized in that, The desizing solution includes 33-ion membrane alkali, long-car desizing agent, and chelating dispersant.

3. The one-bath process for UV-resistant dyeing of fine denier nylon fabric according to claim 1, characterized in that, The first set temperature is 50°C, the second set temperature is 65°C, the third set temperature is 85°C, and the final set temperature is 105°C, with a holding time of 60 minutes.

4. The one-bath process for UV-resistant dyeing of fine denier nylon fabric according to claim 1, characterized in that, The moisturizing period lasts for 5-10 minutes.

5. The one-bath process for UV-resistant dyeing of fine denier nylon fabric according to claim 1, characterized in that, In step S3, the color-fixing temperature is 80°C and the holding time is 30 minutes.

6. The one-bath process for UV-resistant dyeing of fine denier nylon fabric according to claim 1, characterized in that, The waterproofing solution used in the fluorine-free waterproofing process includes a fluorine-free waterproofing agent, a crosslinking agent, and a penetrant.

7. The one-bath process for UV-resistant dyeing of fine denier nylon fabric according to claim 1, characterized in that, In step S1, the rolling liquid pressure during immersion rolling is 0.3-0.4 MPa, and the temperature of the rolling groove is 40°C; the tensioner pressure during coiling is 0.35-0.45 MPa, and the cold stacking time is 48 h.

8. The one-bath process for UV-resistant dyeing of fine denier nylon fabric according to claim 1, characterized in that, The rolling mill pressure during the desizing treatment is 0.3-0.4 MPa, the temperature of the desizing tank is 80-95℃, and the temperature of the washing tank is 50-60℃.

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