Dyeing and finishing process for mitigating hand-pressed whitening of fluoride-free waterproof fabric

Abstract

The present invention relates to the technical field of textile fabrics, and provides a dyeing and finishing process for mitigating hand-pressed whitening of a fluoride-free waterproof fabric. The dyeing and finishing process comprises the following steps: sequentially performing an open-width washing procedure and a setting procedure, wherein a waterproofing auxiliary agent is added during the open-width washing procedure. The waterproofing processing is performed in an open-width washing machine, thus effectively eliminating the phenomenon of hand-pressed whitening caused by uneven penetration of the waterproofing auxiliary agent, and also improving the washing durability of the waterproof performance.

Description

An improved dyeing and finishing process for hand-applied white fluorine-free waterproof fabrics Technical Field

[0001] This invention relates to the field of textile fabric technology, specifically to an improved dyeing and finishing process for hand-grab whitening of fluorine-free waterproof fabrics. Background Technology

[0002] With social development and improved living standards, people are paying more and more attention to the various functional needs of textiles. Because the fluorine in C8 or C6 carbon waterproofing agents is released into the water during washing, it poses a serious safety hazard. Green, environmentally friendly, low-carbon and energy-saving fluorine-free water-repellent fabrics are becoming increasingly popular among consumers for outdoor sports. Technical issues

[0003] The technical problem to be solved by the present invention is: an improved dyeing and finishing process for hand-grab whitening of fluorine-free waterproof fabrics.

[0004] Traditional water-repellent fabrics, as shown in Chinese invention patent CN113005764A, achieve their waterproof effect by impregnating a waterproofing agent onto a tenter frame. This impregnation time is very short, only 3-5 seconds, leaving insufficient time for the waterproofing agent to penetrate, resulting in poor penetration in some areas. When a large amount of waterproofing agent is used, it tends to accumulate on the fiber surface, forming a dense, repetitive film that cannot truly cross-link with the fiber. Such a film structure is unstable and easily breaks or deforms under external forces such as hand scratching, leading to a whitening effect when scratched. The fabric is also less washable, has a rough feel, and exhibits uneven water-repellent properties. This is particularly noticeable in synthetic fiber fabrics and high-density fabrics. Technical solutions

[0005] To solve the above-mentioned technical problems, the technical solution adopted by the present invention is: an improved dyeing and finishing process for hand-grabbed white non-fluorine waterproof fabric, comprising the following steps: performing a flat-width washing process and a setting process in sequence, wherein a waterproofing agent is added during the flat-width washing process. Beneficial effects

[0006] The beneficial effects of this invention are as follows: the waterproofing process of this invention is carried out in a flat-width washing machine, which can effectively eliminate the whitening phenomenon caused by uneven waterproofing penetration and improve the washability of the waterproofing. Attached Figure Description

[0007] Figure 1 shows the hand-grip effect of the finished fabric after being treated by the dyeing and finishing process of the present invention.

[0008] Figure 2 shows a schematic diagram of the flat-width washing machine of the present invention;

[0009] Figure 3 shows the hand-grip effect of the finished fabric after being treated by the dyeing and finishing process of Comparative Example 1 of the present invention.

[0010] Figure 4 shows another hand-grab effect of the finished fabric after being treated by the dyeing and finishing process of Comparative Example 1 of the present invention.

[0011] Label Explanation:

[0012] 1. Fabric feeding extrusion roller; 2. First guide roller; 3. Second guide roller; 4. Fabric output extrusion roller; 5. Washing tank. Embodiments of the present invention

[0013] To explain in detail the technical content, objectives, and effects of the present invention, the following description is provided in conjunction with the embodiments and accompanying drawings.

[0014] An improved dyeing and finishing process for hand-grabbed white non-fluorine waterproof fabric includes the following steps: performing a flat-width washing process and a setting process in sequence, with a waterproofing agent added during the flat-width washing process.

[0015] Unlike traditional waterproofing processes performed in a setting machine, this invention performs the waterproofing process in a flat-width washing machine. This effectively solves the problem of uneven distribution of the waterproofing agent in traditional fluorine-free waterproofing setting processes, eliminates the whitening effect caused by poor penetration, improves the wash resistance of the fabric, allows the waterproofing agent to truly cross-link with the fibers to form a stable film structure, and improves the fabric's hand feel. Compared to traditional setting machine processing, the dyeing and finishing process of this invention increases the yield and reduces processing costs.

[0016] In at least one embodiment, the flat-width washing process is carried out in a flat-width washing machine, which includes at least four washing tanks, each containing a waterproofing agent. Adding the waterproofing agent to all washing tanks in the flat-width washing machine provides more time for penetration, diffusion, and adsorption. After multiple impregnations and stretching, the waterproofing agent penetrates more easily into the fibers, improving the permeability and uniformity of the waterproofing, thereby eliminating the whitening effect of the fabric when handled.

[0017] In at least one embodiment, the temperature of the washing tank first increases and then decreases along the fabric conveying direction. When the fabric first enters the flat-width washing machine, if the temperature at the front end is too high, the fabric will heat up rapidly, causing drastic changes in the internal structure of the fibers, resulting in significant shrinkage in both length and width directions. A lower temperature allows the fabric to gradually adapt to the washing environment, reducing excessive shrinkage caused by sudden temperature changes and maintaining dimensional stability. The higher temperature in the middle washing tank causes the fibers to swell due to heat, increasing the mobility of the waterproofing agent molecules and thus improving the penetration of the waterproofing agent, resulting in a uniform waterproofing effect. After the fabric passes through the middle high-temperature washing section, the fibers have absorbed some moisture and are in a relatively relaxed state. If the temperature at the rear end remains high, the fabric may experience uneven shrinkage and deformation during the subsequent drying process due to rapid moisture evaporation and temperature changes. Setting a lower temperature at the rear end allows the fabric to gradually cool before leaving the flat-width washing machine, reducing the possibility of such deformation.

[0018] In at least one embodiment, the flat-width washing machine includes a fabric infeed squeezing roller, a first guide roller, a second guide roller, a fabric outlet squeezing roller, and a washing tank. The fabric infeed squeezing roller, the second guide roller, and the fabric outlet squeezing roller are arranged sequentially along the fabric conveying direction and are all arranged above the washing tank. The first guide roller is arranged in the washing tank.

[0019] In at least one embodiment, the waterproofing agent includes a fluorine-free finishing agent and a waterproof crosslinking agent.

[0020] In at least one embodiment, the amount of fluorine-free finishing agent added is 8-10 g / L, and the amount of waterproof crosslinking agent added is 0.5-0.8 g / L. The concentration variation of the fluorine-free waterproofing agent in the flat-width washing machine mainly depends on the fabric weight; the lower the weight, the higher the amount of agent used. Fabrics with lower weight have less liquid to absorb and poorer adsorption rate of the waterproofing agent, requiring a slightly higher agent concentration. The fabric weight is 250 g / m². 2 Add fluorine-free waterproofing agent at 10g / L for 250g / m² and below. 2 The above dosage is 8g / L for the addition of fluorine-free waterproofing agent.

[0021] In at least one embodiment, the temperature of the flat-width washing process is 60~80°C.

[0022] In at least one embodiment, when the washing tank has 6 sections, the temperature of the washing tank along the fabric conveying direction is 60°C, 70°C, 80°C, 80°C, 70°C and 60°C respectively.

[0023] In at least one embodiment, when the washing tank has four sections, the temperatures of the washing tank along the fabric conveying direction are 60°C, 70°C, 80°C and 60°C respectively.

[0024] In at least one embodiment, when the washing tank has four sections, the temperatures of the washing tank along the fabric conveying direction are 60°C, 75°C, 80°C and 65°C respectively.

[0025] In at least one embodiment, when the washing tank has 5 sections, the temperature of the washing tank along the fabric conveying direction is 60°C, 70°C, 80°C, 70°C and 60°C respectively.

[0026] In at least one embodiment, the tension of the flat-width washing process is 25~30N.

[0027] In at least one embodiment, the liquid retention rate of the fabric after the flat-width washing process is 60-80%. If the liquid retention rate is too low, the fabric will have poor water resistance; if the liquid retention rate is too high, the consumption of waterproofing agents will be high, increasing costs.

[0028] In at least one embodiment, the setting process is performed within 4 hours after the flat-width washing process is completed. The faster the transfer time, the better, to avoid waterproofing migration caused by prolonged placement in the drum cart.

[0029] In at least one embodiment, the temperature of the forming process is 140~160°C.

[0030] In at least one embodiment, the process further includes a pre-processing step, a dyeing step, a post-processing step, and a drying step, wherein the pre-processing step, dyeing step, post-processing step, drying step, flat-width washing step, and setting step are performed sequentially.

[0031] In at least one embodiment, an improved dyeing and finishing process for hand-applied whitening of fluorine-free waterproof fabric includes the following steps:

[0032] S1. Weaving: The machine is a 34" 28G single-sided machine. The yarn contains 90wt% 60D / 84F recycled physical method polyester semi-dull yarn and 10wt% white 30D spandex yarn.

[0033] S2, Libu;

[0034] S3. Pre-set process: Using a Monfuji tenter frame, temperature 195℃, overfeed 20%, air volume 80%, rolling mill tension 30N, and output specification 250g / m². 2 ;

[0035] S4. Dyeing process: A high-temperature overflow dyeing machine is used, with a liquor ratio of 1:15. The dyeing formula is shown in Table 1. The dyeing temperature is 135℃ and the dyeing time is 45min.

[0036] Table 1

[0037] Component content (unit): High-temperature leveling agent YRJ-139 0.5 owf%; Degreasing agent AFN 0.5 g / L; Dispersant DABONDEX NS 0.5 g / L; Dispersible yellow-brown S-BPF 150% 0.71 owf%; Dispersible yellow-black GR-bs 4.2 owf%; Glacial acetic acid 0.5 g / L

[0038] S5. Post-treatment process: A high-temperature overflow dyeing machine is used. The post-treatment formula is shown in Table 2. The conditions for the first post-treatment are: first, keep warm at 85℃ for 20 minutes, and then treat at 80℃ for 20 minutes. The conditions for the second post-treatment are: treat at 80℃ for 20 minutes. The conditions for acid washing and neutralization are: first, keep warm at 80℃ for 20 minutes, and then treat at 50℃ for 20 minutes.

[0039] Table 2

[0040]

[0041] S6. Mid-term inspection after dehydration;

[0042] S7, Fabrication process;

[0043] S8. Drying process: Temperature 130℃, machine speed 25 yards / min, rolling pressure 30N, upper overfeed 20%, lower overfeed 0%, and the final size is 62 inches. 250g / m 2 ;

[0044] S9. Flat-width washing process: This is carried out in a flat-width washing machine, which includes an infeed squeezing roller 1, a first guide roller 2, a second guide roller 3, an outlet squeezing roller 4, and six washing tanks 5. The infeed squeezing roller 1, the second guide roller 3, and the outlet squeezing roller 4 are arranged sequentially along the fabric conveying direction and are all positioned above the washing tanks 5. The first guide roller 2 is positioned in the washing tanks 5, as shown in Figure 2. 8g / L ®RUCO-DRY ECO PLUS fluorine-free finishing agent (manufactured by Rudolf, Germany, containing polycarbohydrate dimethylamine and dipropylene glycol) and 0.5g / L REPEX are added to each of the washing tanks 5. HF40 waterproof crosslinking agent (manufacturer: Zhuhai Huada Haohong, composition includes aliphatic isocyanate aqueous dispersion), the temperature of washing tank 5 is 60℃, 70℃, 80℃, 80℃, 70℃ and 60℃ sequentially along the fabric conveying direction, the tension of the flat-width washing process is 30N, and the liquid retention rate of the fabric after the flat-width washing process is 70%;

[0045] S10. Finishing Process: The finishing process is carried out within 4 hours after the completion of the flat washing process. The temperature is 150℃, the machine speed is 20 yards / min, the rolling mill pressure is 25N, the upper overfeed is 20%, the lower overfeed is 0%, and the final mill size is 62 inches. 250g / m 2 ;

[0046] S11. Final Inspection: Conduct physical, chemical and appearance quality inspections on the fabric according to standard requirements, test its waterproof and washable properties, and rub the fabric to check for hand scratches. The test results are shown in Figure 1 and Table 3.

[0047] Table 3

[0048]

[0049] In at least one embodiment, 10 g / L ®RUCO-DRY ECO PLUS fluorine-free finishing agent and 0.8 g / L waterproof crosslinking agent are added in the flat-width washing process. The tension of the flat-width washing process is 25 N, and the liquid retention rate of the fabric after the flat-width washing process is 60%. The temperature of the setting process is 160 °C.

[0050] In at least one embodiment, 9 g / L ®RUCO-DRY ECO PLUS fluorine-free finishing agent and 0.7 g / L waterproof crosslinking agent are added in the flat-width washing process. The tension of the flat-width washing process is 27 N, and the liquid retention rate of the fabric after the flat-width washing process is 80%. The temperature of the setting process is 140°C.

[0051] Comparative Example 1 of the present invention is: a conventional dyeing and finishing process, the steps of which are as follows:

[0052] S1. Weaving: The machine is a 34" 28G double-sided weft knitting machine. The yarn contains 90wt% 60D / 84F recycled physical method polyester semi-dull yarn and 10wt% white 30D spandex yarn.

[0053] S2, Libu;

[0054] S3. Pre-set process: Using a Monfuji tenter frame, temperature 195℃, overfeed 20%, air volume 80%, rolling mill tension 30N, and output specification 250g / m². 2 ;

[0055] S4. Dyeing process: A high-temperature overflow dyeing machine is used, with a liquor ratio of 1:15. The dyeing formula is shown in Table 4. The dyeing temperature is 135℃ and the dyeing time is 45min.

[0056] Table 4

[0057] Component content: High-temperature leveling agent YRJ-139 0.5 owf%, degreasing agent AFN 0.5 g / L, dispersant DABONDEX NS 0.5 g / L, dispersing yellow-brown S-BPF 150% 0.71 owf%, dispersing yellow-black GR-bs 4.2 owf%, glacial acetic acid 0.5 g / L

[0058] S5. Post-treatment process: A high-temperature overflow dyeing machine is used. The post-treatment formula is shown in Table 5. The conditions for the first post-treatment are: first, keep warm at 85℃ for 20 minutes, and then treat at 80℃ for 20 minutes. The conditions for the second post-treatment are: treat at 80℃ for 20 minutes. The conditions for acid washing and neutralization are: first, keep warm at 80℃ for 20 minutes, and then treat at 50℃ for 20 minutes.

[0059] Table 5

[0060]

[0061] S6. Mid-term inspection after dehydration;

[0062] S7, Fabrication process;

[0063] S8. Drying process: Temperature 130℃, machine speed 25 yards / min, rolling pressure 30N, upper overfeed 20%, lower overfeed 0%, and the final size is 62 inches. 250g / m 2 ;

[0064] S9. Stentering Process: The product is impregnated with a waterproofing agent on a Monfushi tenter frame and then dried. The waterproofing agent consists of 80g / L ®RUCO-DRY ECO PLUS fluorine-free finishing agent and 10g / L waterproof crosslinking agent. The roll-off percentage is controlled at 70%. The tenter frame temperature is 150℃, the machine speed is 25 yards / min, the roll-off pressure is 30N, the upper overfeed is 20%, the lower overfeed is 0%, and the final size is 62 inches. 250g / m 2 ;

[0065] S10. Final Inspection: Conduct physical, chemical and appearance quality inspections on the fabric according to standard requirements, test its waterproof and washable properties, and rub the fabric to check for hand scratches. The test results are shown in Figures 3 and 4 and Table 6.

[0066] Table 6

[0067]

[0068] In summary, the improved dyeing and finishing process for hand-applied whitening of fluorine-free waterproof fabrics provided by this invention has the following advantages:

[0069] 1. By processing in a flat-width washing machine, the penetration time of the waterproofing agent is increased, and the waterproofing agent truly cross-links with the fiber, effectively solving the problem of hand-grabbing whitening in traditional processes, while improving wash resistance;

[0070] 2. By processing in a flat-width washing machine, a uniform waterproof layer is formed, which improves the feel of the fabric;

[0071] 3. Compared with traditional shaping and machining, it has cost advantages in terms of equipment use and auxiliary agent consumption; it reduces the defect rate caused by problems such as hand-scratching and uneven water-repellent effect, thereby improving the overall production rate.

[0072] The above description is merely an embodiment of the present invention and does not limit the patent scope of the present invention. Any equivalent modifications made based on the content of the present invention specification and drawings, or direct or indirect applications in related technical fields, are similarly included within the patent protection scope of the present invention.

Claims

1. A dyeing and finishing process for improving hand whitening of a fluorine-free water repellent fabric, characterized by, Includes the following steps: The process involves sequentially performing a flat-width washing process and a setting process, during which a waterproofing agent is added.

2. The dyeing and finishing process for improving hand-whiteness of a fluorine-free water repellent fabric according to claim 1, characterized in that, The flat-width washing process is carried out in a flat-width washing machine, which includes at least four washing tanks, each containing a waterproofing agent.

3. The dyeing and finishing process for improving hand-whiteness of a fluorine-free water repellent fabric according to claim 2, characterized in that, The temperature of the washing tank first increases and then decreases along the fabric conveying direction.

4. The process as claimed in claim 1, wherein the process for improving hand whiteness of non-fluoro repellent fabric is characterized by, The waterproofing additives include fluorine-free finishing agents and waterproof crosslinking agents.

5. The dyeing and finishing process for improving hand-whiteness of a fluorine-free water repellent fabric according to claim 4, wherein The amount of the fluorine-free finishing agent added is 8~10g / L, and the amount of the waterproof crosslinking agent added is 0.5~0.8g / L.

6. The process as claimed in claim 1, wherein the process for improving hand whiteness of non-fluoro repellent fabric is characterized by, The temperature of the flat-width washing process is 60~80℃.

7. The process as claimed in claim 1, wherein the process for improving hand whiteness of non-fluoro repellent fabric is characterized by, The tension of the flat-width washing process is 25~30N.

8. The dyeing and finishing process for improving hand-whiteness of a fluorine-free water repellent fabric according to claim 1, wherein After the flat-width washing process, the liquid retention rate of the fabric is 60-80%.

9. The process as claimed in claim 1, wherein the process for improving hand whiteness of non-fluoro repellent fabric is characterized by, The finishing process is carried out within 4 hours after the completion of the flat-width washing process.

10. The process as claimed in claim 1, wherein the process for improving hand whiteness of non-fluoro repellent fabric is characterized by, The temperature of the forming process is 140~160℃.

11. The process as claimed in claim 1, wherein the process for improving hand whiteness of non-fluoro repellent fabric is characterized by, It also includes a pre-processing step, a dyeing step, a post-processing step, and a drying step, wherein the pre-processing step, dyeing step, post-processing step, drying step, flat-width washing step, and setting step are performed sequentially.

Images