Dyeing and finishing process for improving hand grasp whitening of fluoride-free waterproof fabric

Abstract

The invention relates to the technical field of textile fabrics, in particular to a dyeing and finishing process for improving hand grasp whitening of a fluoride-free waterproof fabric. The dyeing and finishing process comprises the following steps that an open-width washing procedure and a setting procedure are sequentially carried out, and a waterproof auxiliary is added in the open-width washing procedure. The waterproof processing is carried out in an open-width washing machine, so that the phenomenon of white grasping caused by non-uniform water permeation can be effectively eliminated, and meanwhile, the waterproof washable performance can be improved.

Description

Technical Field

[0001] The invention relates to the technical field of textile fabrics, and in particular to a dyeing and finishing process for improving the hand-grabbing whiteness of fluorine-free waterproof fabrics. Background Art

[0002] With the development of society and the improvement of living standards, people pay more and more attention to the various functional needs of textiles. Since the fluorine element in fluorine-containing C8 carbon or C6 carbon waterproofing agents will fall off during washing and melt into the water, there is a serious safety hazard. Green, environmentally friendly, low-carbon and energy-saving fluorine-free water-repellent fabrics are becoming more and more popular among consumers in outdoor sports. Summary of the invention

[0003] The technical problem to be solved by the present invention is: a dyeing and finishing process for improving the hand-grabbing whiteness of fluorine-free waterproof fabrics.

[0004] Traditional water-repellent fabrics, as shown in the Chinese invention patent with publication number CN113005764A, are impregnated with a waterproofing agent on a stenter setting machine to achieve a waterproofing effect. The impregnation time is very short, only 3 to 5 seconds, and the waterproofing agent does not have enough time to penetrate. Some waterproofing agents have poor permeability. When the amount of waterproofing agent is large, it is easy to accumulate on the fiber surface to form a dense and repeated film layer, which cannot be truly cross-linked with the fiber. Such a film layer structure is unstable. When subjected to external forces such as hand grasping, the film layer is easy to break or produce uneven deformation, which leads to the hand grasping white phenomenon. The fabric is not washable, feels rough, and the water-repellent effect is uneven. It is more obvious on chemical fiber fabrics and high-density fabrics.

[0005] In order to solve the above technical problems, the technical solution adopted by the present invention is: a dyeing and finishing process for improving the hand-grabbed white of fluorine-free waterproof fabrics, comprising the following steps: performing an open-width washing process and a setting process in sequence, and adding a waterproofing auxiliary agent during the open-width washing process.

[0006] The beneficial effect of the present invention is that the waterproof processing of the present invention is carried out in an open-width washing machine, which can effectively eliminate the hand-grabbing white phenomenon caused by uneven waterproof penetration and at the same time improve the waterproof washability. BRIEF DESCRIPTION OF THE DRAWINGS

[0007] Figure 1 The figure shows the hand-grabbing effect of the finished fabric after the dyeing and finishing process of the present invention; Figure 2 The figure shows a schematic structural diagram of an open-width washing machine of the present invention; Figure 3 The figure shows the hand-grabbing effect of the finished fabric after the dyeing and finishing process of the comparative example 1 of the present invention; Figure 4 Another hand-grabbing effect diagram of the finished fabric after the dyeing and finishing process of Comparative Example 1 of the present invention is shown; Description of labels: 1. Cloth inlet squeeze roller; 2. First guide roller; 3. Second guide roller; 4. Cloth outlet squeeze roller; 5. Water washing tank. DETAILED DESCRIPTION

[0008] In order to explain the technical content, achieved objectives and effects of the present invention in detail, the following is an explanation in combination with the implementation modes and the accompanying drawings.

[0009] A dyeing and finishing process for improving the hand-grabbing whiteness of fluorine-free waterproof fabrics comprises the following steps: sequentially performing an open-width washing process and a setting process, and adding a waterproofing auxiliary agent during the open-width washing process.

[0010] Different from the traditional process of waterproofing in a setting machine, the waterproofing process of the present invention is carried out in an open-width washing machine, which can effectively solve the problem of uneven distribution of waterproofing agents in the traditional fluorine-free waterproof setting process, eliminate the hand-grabbing white phenomenon caused by poor permeability, improve the washing resistance of the fabric, make the waterproofing agent and the fiber truly cross-linked, form a stable film structure, and improve the feel of the fabric. Compared with the traditional setting machine processing, the dyeing and finishing process of the present invention improves the production rate and reduces the processing cost. In at least one embodiment, the open-width washing process is carried out in an open-width washing machine, which includes at least 4 washing tanks, and waterproofing agents are added to the washing tanks. The waterproofing agents are added to the washing tanks of the open-width washing machine, which has more penetration, diffusion and adsorption time. After multiple padding and stretching and squeezing, the fabric is more likely to penetrate into the fiber, which improves the permeability and uniformity of waterproofing, thereby eliminating the phenomenon of fabric being white when grasped by hand.

[0011] In at least one embodiment, the temperature of the washing tank increases first and then decreases along the fabric conveying direction. When the fabric first enters the open-width washing machine, if the temperature at the front end is too high, the fabric will be heated quickly, the internal structure of the fiber will change dramatically, and the fabric will shrink greatly in the length and width directions; while the lower temperature allows the fabric to gradually adapt to the washing environment, reduce the excessive shrinkage caused by temperature changes, and maintain the stability of the fabric size. The temperature of the middle section washing tank is higher, so that the fiber swells due to heat, and the molecular mobility of the waterproofing agent is improved, thereby improving the permeability of the waterproofing agent, and the waterproofing effect of the fabric is uniform. After the fabric passes through the middle high-temperature washing section, the fiber has absorbed a certain amount of water and is in a relatively relaxed state. If the temperature at the rear end is still high, in the subsequent drying process, the fabric may shrink and deform unevenly due to rapid evaporation of water and temperature changes. Setting a lower temperature at the rear end can allow the fabric to gradually cool before leaving the open-width washing machine, reducing the possibility of such deformation.

[0012] In at least one embodiment, the open-width washing machine includes a cloth feed squeezing roller, a first guide roller, a second guide roller, a cloth discharge squeezing roller and a washing tank. The cloth feed squeezing roller, the second guide roller and the cloth discharge squeezing roller are arranged in sequence along the fabric conveying direction and are all arranged above the washing tank. The first guide roller is arranged in the washing tank.

[0013] In at least one embodiment, the water-repellent auxiliary agent includes a fluorine-free finishing agent and a water-repellent cross-linking agent.

[0014] 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 of fluorine-free waterproofing additive in the open-width washing machine mainly depends on the weight of the fabric. The lower the weight, the higher the amount of additive. The fabric with low weight has less liquid and poor adsorption rate of waterproofing additive, so the concentration of additive needs to be appropriately increased. The weight of the fabric is 250 g / m 2 For the following, add fluorine-free waterproofing agent at 10g / L, 250g / m 2 The above fluorine-free waterproofing agent is added at 8g / L.

[0015] In at least one embodiment, the temperature of the open-width washing process is 60-80°C.

[0016] In at least one embodiment, when the water washing tank has 6 sections, the temperatures of the water washing tank are 60°C, 70°C, 80°C, 80°C, 70°C and 60°C respectively along the fabric conveying direction.

[0017] In at least one embodiment, when the water washing tank has 4 sections, the temperatures of the water washing tank are 60°C, 70°C, 80°C and 60°C respectively along the fabric conveying direction.

[0018] In at least one embodiment, when the water washing tank has 4 sections, the temperatures of the water washing tank are 60°C, 75°C, 80°C and 65°C respectively along the fabric conveying direction.

[0019] In at least one embodiment, when the water washing tank has 5 sections, the temperatures of the water washing tank are 60°C, 70°C, 80°C, 70°C and 60°C respectively along the fabric conveying direction.

[0020] In at least one embodiment, the tension of the open-width washing process is 25~30N.

[0021] In at least one embodiment, the liquid carrying rate of the fabric after the open-width washing process is 60-80%. If the liquid carrying rate is too low, the waterproofness of the fabric is poor, and if the liquid carrying rate is too high, the consumption of waterproofing additives is high, which increases the cost.

[0022] In at least one embodiment, the setting process is carried out within 4 hours after the flat-width washing process is completed. The faster the flow time, the better, which can avoid waterproof migration caused by placing the barrel in the car for too long.

[0023] In at least one embodiment, the temperature of the forming process is 140-160°C.

[0024] In at least one embodiment, it also includes a predetermined process, a dyeing process, a post-processing process and a drying process, and the predetermined process, the dyeing process, the post-processing process, the drying process, the flat-width washing process and the finishing process are performed in sequence.

[0025] In at least one embodiment, a dyeing and finishing process for improving the hand-grabbing whiteness of fluorine-free waterproof fabrics comprises the following steps: S1. Weaving: The machine is 34" 28G single-sided machine, and the proportion of 60D / 84F recycled physical polyester semi-dull yarn in the yarn is 90wt%, and the proportion of white 30D spandex yarn is 10wt%; S2, cloth arrangement; S3, scheduled process: using Monforts stenter, temperature is 195℃, overfeed is 20%, air volume is 80%, padding tension is 30N, and the machine specification is 250g / m 2 ; S4, dyeing process: using a high temperature overflow dyeing machine, the bath ratio is 1:15, the dyeing formula is shown in Table 1, the dyeing temperature is 135°C, and the dyeing time is 45min; Table 1

[0026] S5, post-treatment process: using a high-temperature overflow dyeing machine, the post-treatment formula is shown in Table 2; the conditions for the first post-treatment are: first keep warm at 85°C for 20 minutes, then treat at 80°C for 20 minutes; the conditions for the second post-treatment are: treat at 80°C for 20 minutes; the conditions for pickling and neutralization are: first keep warm at 80°C for 20 minutes, then treat at 50°C for 20 minutes; Table 2

[0027] S6, intermediate inspection after dehydration; S7, spreading process; S8, drying process: temperature is 130℃, machine speed is 25 yards / min, padding pressure is 30N, upper overfeed is 20%, lower overfeed is 0%, lower machine specification is 62 inches * 250g / m 2 ; S9, open-width washing process: It is carried out in an open-width washing machine, which includes a cloth-in squeezing roller 1, a first guide roller 2, a second guide roller 3, a cloth-out squeezing roller 4 and a 6-section washing tank 5. The cloth-in squeezing roller 1, the second guide roller 3 and the cloth-out squeezing roller 6 are arranged in sequence along the fabric conveying direction and are all arranged above the washing tank 5. The first guide roller 2 is arranged in the washing tank 5. Figure 2; 8g / L®RUCO-DRY ECO PLUS fluorine-free finishing agent (manufactured by Rudolf, Germany, containing polycarbodimethylamine and polyurethane dipropylene glycol) and 0.5g / L REPEXHF40 waterproof crosslinking agent (manufactured by Huada Haohong, Zhuhai, containing aliphatic isocyanate aqueous dispersion) were added to the washing tank 5. The temperature of the washing tank 5 was 60℃, 70℃, 80℃, 80℃, 70℃ and 60℃ along the fabric conveying direction. The tension of the open-width washing process was 30N. After the open-width washing process, the liquid carrying rate of the fabric was 70%; S10, Finishing process: The finishing process is carried out within 4 hours after the completion of the open-width washing process, the temperature is 150℃, the machine speed is 20 yards / min, the padding pressure is 25N, the upper overfeed is 20%, the lower overfeed is 0%, and the lower machine specification is 62 inches * 250g / m 2 ; S11. Finished product inspection: Physical, chemical and appearance quality inspection of fabrics according to standard requirements, test waterproof and washable properties, rub the fabrics to see if there are scratches, and the test results are shown in the table. Figure 1 and Table 3.

[0028] Table 3

[0029] In at least one embodiment, 10g / L®RUCO-DRY ECO PLUS fluorine-free finishing agent and 0.8g / L waterproof cross-linking agent are added in the open-width washing process, the tension of the open-width washing process is 25N, and the liquid carrying rate of the fabric after the open-width washing process is 60%; the temperature of the setting process is 160°C.

[0030] In at least one embodiment, 9g / L®RUCO-DRY ECO PLUS fluorine-free finishing agent and 0.7g / L waterproof cross-linking agent are added in the open-width washing process, the tension of the open-width washing process is 27N, and the liquid carrying rate of the fabric after the open-width washing process is 80%; the temperature of the setting process is 140°C.

[0031] Comparative Example 1 of the present invention is: a conventional dyeing and finishing process, the steps are as follows: S1. Weaving: The machine is a 34" 28G weft knitting double-sided machine. The yarn is made of 90wt% 60D / 84F recycled physical polyester semi-dull yarn and 10wt% white 30D spandex yarn. S2, cloth arrangement; S3, scheduled process: using Monforts stenter, temperature is 195℃, overfeed is 20%, air volume is 80%, padding tension is 30N, and the machine specification is 250g / m 2 ; S4, dyeing process: using a high temperature overflow dyeing machine, the bath ratio is 1:15, the dyeing formula is shown in Table 4, the dyeing temperature is 135°C, and the dyeing time is 45min; Table 4

[0032] S5, post-treatment process: using a high-temperature overflow dyeing machine, the post-treatment formula is shown in Table 5; the conditions for the first post-treatment are: first keep warm at 85°C for 20 minutes, then treat at 80°C for 20 minutes; the conditions for the second post-treatment are: treat at 80°C for 20 minutes; the conditions for pickling and neutralization are: first keep warm at 80°C for 20 minutes, then treat at 50°C for 20 minutes; Table 5

[0033] S6, intermediate inspection after dehydration; S7, spreading process; S8, drying process: temperature is 130℃, machine speed is 25 yards / min, padding pressure is 30N, upper overfeed is 20%, lower overfeed is 0%, lower machine specification is 62 inches * 250g / m 2 ; S9, Finishing process: Dip and roll the waterproofing agent on the Monforts stenter setting machine and dry it; the waterproofing agent is composed of 80g / L®RUCO-DRY ECO PLUS fluorine-free finishing agent and 10g / L waterproof cross-linking agent, and the rolling rate is controlled to be 70%; the temperature of the stenter setting machine is 150℃, the machine speed is 25 yards / min, the rolling pressure is 30N, the upper overfeed is 20%, the lower overfeed is 0%, and the lower machine specification is 62 inches*250g / m 2 ; S10, Finished product inspection: Conduct physical, chemical and appearance quality inspections on the fabrics according to standard requirements, test waterproofness and washability, rub the fabrics to see if there are scratches, and the test results are shown in the table. Figure 3 , Figure 4 and Table 6.

[0034] Table 6

[0035] In summary, the dyeing and finishing process for improving the hand-grabbing white of fluorine-free waterproof fabrics provided by the present invention has the following advantages: 1. Through processing in an open-width washing machine, the penetration time of the waterproofing agent is increased, and the waterproofing agent is truly cross-linked with the fiber, which effectively solves the hand-grabbing white problem in the traditional process and improves the washing resistance; 2. Through processing in an open-width washing machine, a uniform waterproof layer is formed, which improves the feel of the fabric; 3. Compared with traditional shaping machine processing, it has cost advantages in equipment use and auxiliary agent consumption; it reduces the defective rate caused by problems such as whitening by hand and uneven water-repellent effect, thereby improving the overall completion rate.

[0036] The above descriptions are merely embodiments of the present invention and are not intended to limit the patent scope of the present invention. Any equivalent transformations made using the contents of the present invention's specification and drawings, or directly or indirectly applied in related technical fields, are also included in the patent protection scope of the present invention.

Claims

1. A dyeing and finishing process for improving the hand-grabbing whiteness of fluorine-free waterproof fabrics, characterized in that: The following steps are involved: The open-width washing process and the setting process are carried out in sequence, and a waterproofing auxiliary agent is added during the open-width washing process.

2. The dyeing and finishing process for improving the hand-grabbing whiteness of fluorine-free waterproof fabric according to claim 1 is characterized in that: The open-width washing process is carried out in an open-width washing machine, which includes at least four washing tanks, and waterproofing additives are added to the washing tanks.

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

4. The dyeing and finishing process for improving the hand-grabbing whiteness of fluorine-free waterproof fabric according to claim 1 is characterized in that: The waterproofing auxiliary agent includes a fluorine-free finishing agent and a waterproof cross-linking agent.

5. The dyeing and finishing process for improving the hand-grabbing whiteness of fluorine-free waterproof fabric according to claim 4 is characterized in that: The addition amount of the fluorine-free finishing agent is 8-10 g / L, and the addition amount of the waterproof cross-linking agent is 0.5-0.8 g / L.

6. The dyeing and finishing process for improving the hand-grabbing whiteness of fluorine-free waterproof fabric according to claim 1 is characterized in that: The temperature of the open-width washing process is 60-80°C.

7. The dyeing and finishing process for improving the hand-grabbing whiteness of fluorine-free waterproof fabric according to claim 1 is characterized in that: The tension of the open-width washing process is 25~30N.

8. The dyeing and finishing process for improving the hand-grabbing whiteness of fluorine-free waterproof fabric according to claim 1 is characterized in that: After the open-width washing process, the liquid-carrying rate of the fabric is 60-80%.

9. The dyeing and finishing process for improving the hand-grabbing whiteness of fluorine-free waterproof fabric according to claim 1, characterized in that: The finishing process is carried out within 4 hours after the open-width washing process is completed.

10. The dyeing and finishing process for improving the hand-grabbing whiteness of fluorine-free waterproof fabric according to claim 1, characterized in that: The temperature of the setting process is 140~160℃.

11. The dyeing and finishing process for improving the hand-grabbing whiteness of fluorine-free waterproof fabric according to claim 1, characterized in that: The method also includes a predetermined process, a dyeing process, a post-processing process and a drying process, wherein the predetermined process, the dyeing process, the post-processing process, the drying process, the open-width washing process and the finishing process are performed in sequence.

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