A dyeing and finishing process for solving waterproof defects

Abstract

The present invention relates to the technical field of dyeing and finishing processes, and specifically to a dyeing and finishing process for resolving water-repellent defects. The dyeing and finishing process comprises the following steps: immersing the fabric in water, adding a scouring agent, caustic soda flakes, and a cleaning agent, scouring at 80-90°C for 30-40 minutes, then cooling the fabric to 60-70°C, draining the fabric under pressure, and then dyeing the fabric; immersing the dyed fabric in water, adding caustic soda flakes, a cleaning agent, and a chelating dispersant, and soaping the fabric at 65-75°C for 30-40 minutes. The dyeing and finishing process prevents water-repellent defects by adjusting the dyeing and finishing formula and parameters.

Description

Technical Field

[0001] The present invention relates to the technical field of dyeing and finishing technology, and in particular to a dyeing and finishing technology for solving waterproof defects. Background Art

[0002] With the continuous development of the textile industry, people's requirements for the waterproof performance of fabrics are constantly increasing. The existing technology generally achieves the waterproof effect of the fabric by adding waterproofing additives during the post-processing process such as dyeing and finishing, but this method is prone to environmental problems and has shortcomings such as poor water resistance, and its development prospects are limited. The Chinese utility model patent with application number 201921110558.X discloses a splash-proof, oil-proof and anti-fouling fiber with a mace structure, including a needle tip layer, a cortex and a fiber core arranged in sequence from the inside to the outside. The material of the needle tip is a fluorine-containing water-collecting material. The splash-proof, oil-proof and anti-fouling fiber, also known as a charge-effect fiber, has excellent water-resistant performance. However, due to the characteristics of the splash-proof, oil-proof and anti-fouling fiber itself, the fabric woven from it is prone to white colloidal defects, i.e., waterproof defects, on the surface of the fabric after dyeing and finishing, which affects the appearance and use of the fabric. How to avoid the problem of waterproof defects in the production process has become a problem that needs to be solved urgently. Summary of the Invention

[0003] The technical problem to be solved by the present invention is to provide a dyeing and finishing process, which can avoid the occurrence of waterproof defects in the charged effect fiber during the dyeing and finishing process.

[0004] In order to solve the above technical problems, the technical solution adopted by the present invention is: a dyeing and finishing process for solving waterproof defects, comprising the following steps: immersing the fabric in water, adding a refining agent, caustic soda and a cleaning agent, refining at a temperature of 80 to 90°C for 30 to 40 minutes, then pressurizing and draining the fabric when the temperature is lowered to 60 to 70°C, and then dyeing the fabric; immersing the dyed fabric in water, adding caustic soda, a cleaning agent and a chelating dispersant, and soaping the fabric at a temperature of 65 to 75°C for 30 to 40 minutes.

[0005] The beneficial effects of the present invention are as follows: the dyeing and finishing process of the present invention prevents the occurrence of waterproof defects by adjusting the dyeing and finishing formula and parameters. A cleaning agent is added during refining to remove surfactants, impurities, and polyester oligomers carried by the fabric, thereby avoiding the occurrence of waterproof defects. After refining, pressurized drainage is performed when the temperature is lowered to 60-70°C to prevent the waterproof defects from returning to the fabric surface. The soaping process prevents the re-formation of colloidal white defects on the fabric surface after high-temperature dyeing. The addition of a cleaning agent during soaping removes surfactants, impurities, and polyester oligomers carried by the dyed fabric, and further removes polyester oligomers by chelating metal ions such as calcium and magnesium ions in the dispersant. BRIEF DESCRIPTION OF THE DRAWINGS

[0006] Figure 1The figure shows the embodiment 1 of the present invention after the dyeing and finishing process;

[0007] Figure 2 Shown is a physical picture of Comparative Example 3 of the present invention after dyeing and finishing process. DETAILED DESCRIPTION

[0008] To illustrate the technical content, achieved objectives and effects of the present invention in detail, the following description is given in conjunction with the embodiments and accompanying drawings.

[0009] A dyeing and finishing process for solving waterproof defects comprises the following steps: immersing the fabric in water, adding a scouring agent, caustic soda flakes and a cleaning agent, scouring at a temperature of 80-90°C for 30-40 minutes, then cooling the fabric to 60-70°C, draining the fabric under pressure, and then dyeing the fabric; immersing the dyed fabric in water, adding caustic soda flakes, the cleaning agent and a chelating dispersant, and soaping the fabric at a temperature of 65-75°C for 30-40 minutes.

[0010] As can be seen from the above description, the beneficial effects of the present invention are as follows: the dyeing and finishing process of the present invention includes a scouring step, a dyeing step, and a soaping step performed sequentially. During scouring, a scouring agent is added to remove oil, and a cleaning agent is added to remove surfactants, impurities, and polyester oligomers carried by the fabric. The addition of caustic soda can assist the scouring agent and the cleaning agent, thereby preliminarily avoiding the occurrence of waterproof defects. Too low a refining temperature will result in incomplete degreasing, while too high a temperature will not only cause the waterproof performance of the fabric to decline, but also produce more waterproof defects. Therefore, the refining temperature is controlled to 80-90°C. After refining, when the temperature is cooled to 60-70°C, pressurized drainage is performed to prevent waterproof defects from returning to the fabric surface. The soaping process can prevent the re-formation of colloidal white defects on the fabric surface after high-temperature dyeing. The addition of a cleaning agent during soaping removes surfactants, impurities, and polyester oligomers carried by the dyed fabric. Metal ions such as calcium and magnesium ions in the chelating dispersant can further remove polyester oligomers. Caustic soda flakes can assist the cleaning agent and chelating dispersant. Too low a soaping temperature will have a poor effect on removing polyester oligomers, while too high a temperature will result in more waterproof defects. Therefore, the soaping temperature is controlled between 65 and 75°C. These adjustments effectively avoid the occurrence of waterproof defects during dyeing and finishing.

[0011] Furthermore, the fabric is subjected to a pre-setting treatment before being scour, and the temperature of the pre-setting treatment is 150-170°C.

[0012] From the above description, it can be seen that the pre-setting process can improve the feel and smoothness of the fabric. If the pre-setting temperature is too low, the pre-setting effect will be poor. If the pre-setting temperature is too high, more white glue defects will be produced on the fabric. Therefore, the temperature of the pre-setting treatment is controlled to be 150-170℃.

[0013] Furthermore, during refining, the amount of refining agent added is 1.0-3.0 g / L, the amount of caustic soda added is 0.5-1.5 g / L, and the amount of cylinder cleaning agent added is 0.5-1.5 g / L.

[0014] From the above description, it can be seen that when the caustic soda content exceeds 3.0 g / L during refining, the waterproof effect of the fabric will be affected, the fabric will be prone to powdering, and the occurrence of waterproof defects will increase.

[0015] Furthermore, the bath ratio during refining is 1:10-15.

[0016] From the above description, it can be seen that when the bath ratio is less than 1:10, the additive content is low and the defects cannot be washed away. When the bath ratio is greater than 1:15, the additive content increases, which reduces the probability of defect re-staining, but increases the cost.

[0017] Furthermore, the dyeing temperature during dyeing is 110-130° C., and the dyeing time is 30-50 minutes.

[0018] From the above description, it can be seen that if the dyeing temperature is too low, the dyeing effect will be poor, and if the dyeing temperature is too high, more waterproof defects will be produced. Therefore, the dyeing temperature is controlled to be 110-130℃.

[0019] Furthermore, the dyed fabric is first subjected to reduction cleaning and then to soap washing.

[0020] From the above description, it can be seen that reduction cleaning after dyeing can avoid the reduction of dye fastness and reduce or avoid the use of soaping liquid in the soaping process, further improving the decomposition effect of waterproof defects in the soaping process.

[0021] Furthermore, during soaping, the amount of caustic soda added is 0.5-1.5 g / L, the amount of cleaning agent added is 0.5-1.5 g / L, and the amount of chelating dispersant added is 1.5-3 g / L.

[0022] Furthermore, the mass ratio of the caustic soda flakes, the tank cleaning agent and the chelating dispersant is 1:1:2.

[0023] From the above description, it can be seen that when the mass ratio of caustic soda, cylinder cleaning agent and chelating dispersant is 1:1:2, the emulsification and dispersion effect of defects is best.

[0024] Furthermore, the bath ratio during soaping is 1:10-15.

[0025] Furthermore, the soaped fabric is subjected to a setting treatment at a temperature of 150-165°C.

[0026] From the above description, it can be seen that if the setting temperature is too low, the setting effect will be poor, and if the setting temperature is too high, the waterproof performance of the fabric will be reduced. Therefore, the setting temperature is controlled to be 150-165°C.

[0027] The refining agent in the following examples is DK-MFB from Dakai, the cylinder cleaning agent is DK-DER from Dakai, the chelating dispersant is DK-325 from Dakai, and the fabric is a polyester Oxford cloth woven from the splash-proof, oil-proof and anti-fouling fiber disclosed in the Chinese utility model patent application number 201921110558.X.

[0028] Please refer to Figure 1 , Embodiment 1 of the present invention is: a dyeing and finishing process for solving waterproof defects, the steps are as follows:

[0029] S1, pre-forming process: temperature is 160℃, speed is 20m / min.

[0030] S2. Refining process: immerse the fabric in water, add 2g / L refining agent, 1g / L caustic soda and 0.5g / L tank cleaning agent, and scour at 80℃ for 40min, with a bath ratio of 1:10 and a tank capacity of 90%. After refining, cool the fabric to 65℃ and drain the water under pressure.

[0031] S3, dyeing process: adding 5wt% disperse black S-BL, 1.5wt% leveling agent TYW-646, 0.6wt% glacial acetic acid, 1.5wt% dispersant MF-A, and dyeing at 120°C for 30min.

[0032] S4. Reduction cleaning: add 2g / l caustic soda and 4g / l hydrosulfite, bath ratio 1:12, and carry out reduction cleaning at 80℃ for 20min.

[0033] S5. Soaping process: Soak the dyed fabric in water, add 1g / L caustic soda, 1g / L cleaning agent and 2g / L chelating dispersant, and soap at 70℃ for 40min, with a bath ratio of 1:12 and a vat capacity of 90%.

[0034] S6, setting process: temperature is 160℃, speed is 35m / min. The fabric after setting is Figure 1 .

[0035] The second embodiment of the present invention is a dyeing and finishing process for solving waterproof defects, comprising the following steps:

[0036] S1, pre-forming process: temperature is 150℃, speed is 20m / min.

[0037] S2. Refining process: immerse the fabric in water, add 1.0g / L refining agent, 0.5g / L caustic soda and 1g / L tank cleaning agent, and scour at 85℃ for 35min, with a bath ratio of 1:15 and a tank capacity of 80%. After refining, cool the fabric to 60℃ and drain the water under pressure.

[0038] S3, dyeing process: adding 5wt% disperse black S-BL, 1.5wt% leveling agent TYW-646, 0.6wt% glacial acetic acid, 1.5wt% dispersant MF-A, and dyeing at 110°C for 50min.

[0039] S4. Reduction cleaning: add 2g / l caustic soda and 4g / l hydrosulfite, bath ratio 1:13, and carry out reduction cleaning at 85℃ for 20min.

[0040] S5. Soaping process: Soak the dyed fabric in water, add 0.5g / L caustic soda, 0.5g / L cleaning agent and 1.5g / L chelating dispersant, and soap for 38min at a temperature of 65℃, with a bath ratio of 1:10 and a vat capacity of 90%.

[0041] S6, finishing process: temperature is 150℃, speed is 35m / min.

[0042] The third embodiment of the present invention is a dyeing and finishing process for solving waterproof defects, comprising the following steps:

[0043] S1, pre-forming process: temperature is 170℃, speed is 20m / min.

[0044] S2. Refining process: immerse the fabric in water, add 3.0g / L refining agent, 1.5g / L caustic soda and 1.5g / L tank cleaning agent, and scour at 90℃ for 30min, with a bath ratio of 1:12 and a tank capacity of 90%. After refining, cool the fabric to 70℃ and drain the water under pressure.

[0045] S3, dyeing process: adding 5wt% disperse black S-BL, 1.5wt% leveling agent TYW-646, 0.6wt% glacial acetic acid, 1.5wt% dispersant MF-A, and dyeing at 130°C for 40 minutes.

[0046] S4. Reduction cleaning: add 2g / l caustic soda and 4g / l hydrosulfite, bath ratio 1:13, and carry out reduction cleaning at 83℃ for 20min.

[0047] S5. Soaping process: Soak the dyed fabric in water, add 1.5g / L caustic soda, 1.5g / L cleaning agent and 3g / L chelating dispersant, and soap at 75℃ for 30min, with a bath ratio of 1:15 and a vat capacity of 90%.

[0048] S6, finishing process: temperature is 165℃, speed is 35m / min.

[0049] Comparative Example 1 of the present invention is:

[0050] The difference between Comparative Example 1 and Example 1 is that the fabric has not been subjected to the pre-setting process, the refining process, the dyeing process, the reduction cleaning process, the soaping process and the setting process.

[0051] Comparative Example 2 of the present invention is:

[0052] The only difference between Comparative Example 2 and Example 1 is that the fabric is a polyester Oxford cloth woven from conventional polyester, which is waterproofed by a waterproofing additive, and the dyeing and finishing steps are as follows:

[0053] S1, water washing and shrinking process: temperature 95℃, speed 20m / min.

[0054] S2. Dyeing process: add 5% by mass of disperse black S-BL, 1.5% of leveling agent TYW-646, 0.6% of glacial acetic acid, and 1.5% of dispersant MF-A into water, and dye at 120° C. for 30 minutes.

[0055] S3. Reduction cleaning: add 2g / l caustic soda and 4g / l hydrosulfite, bath ratio 1:13, reduction cleaning at 83℃ for 20min, and then drying.

[0056] S4, setting process: adding 5 wt% RUCO-DRY ECO PLUS fluorine-free waterproof finishing agent (Rudolf) for setting, the setting temperature is 160° C., and the vehicle speed is 35 m / min.

[0057] Please refer to Figure 2 , Comparative Example 3 of the present invention is:

[0058] The only difference between Comparative Example 3 and Example 1 is that the dyeing and finishing steps are as follows:

[0059] S1, pre-forming process: temperature is 160℃, speed is 20m / min.

[0060] S2. Refining process: immerse the fabric in water, add 2g / L refining agent and 1g / L caustic soda, and scour at 80℃ for 40min, with a bath ratio of 1:10 and a tank capacity of 90%. After refining, cool the fabric to room temperature and drain the water under pressure.

[0061] S3, dyeing process: add 5% by mass of disperse black S-BL, 1.5% leveling agent TYW-646, 0.6% glacial acetic acid, and 1.5% dispersant MF-A into water, and dye at 120° C. for 30 minutes.

[0062] S4. Reduction cleaning: add 2g / l caustic soda and 4g / l hydrosulfite, bath ratio 1:13, reduction cleaning at 83℃ for 20min, and then dry.

[0063] S5, setting process: temperature is 160℃, speed is 35m / min. The fabric after setting is Figure 2 .

[0064] Three pieces of 20 cm × 20 cm in size were taken from each of the fabrics prepared in Example 1, Comparative Example 1, Comparative Example 2, and Comparative Example 3, and their waterproof properties were measured according to the standard "GB / T 5553-2007 Determination of Waterproofing Power of Surfactant Waterproofing Agents". The measurement results are shown in Table 1.

[0065] The specific method for measuring waterproof performance is as follows: Secure the fabric on a tenter frame to form a smooth, wrinkle-free surface. Then, secure the tenter frame to the tester's bracket, with the fabric facing upward. Quickly pour 250 mL of distilled water at 27±1°C into the funnel, allowing the entire surface to flow completely within 25-30 seconds. Immediately, gently tap the other side of the tenter frame, then rotate 180° and tap again to remove any excess water droplets. Finally, compare the front of the fabric sample to a standard wetness chart for rating.

[0066] Table 1

[0067]

[0068]

[0069] Refer to Table 1 and Figures 1-2 By comparing Example 1 with Comparative Example 1, it can be seen that the fabric woven with the charge-effect fiber can obtain waterproof performance only after dyeing; by comparing Example 1 with Comparative Example 2, it can be seen that the fabric prepared by the conventional auxiliary agent waterproofing method has poor water resistance; by comparing Example 1 with Comparative Example 3, it can be seen that the dyeing and finishing process of the present application is used to dye and finish the fabric woven with the charge-effect fiber, which can effectively avoid the occurrence of waterproof defects in the fabric.

[0070] From the above description, it can be seen that the beneficial effects of the present invention are: the dyeing and finishing process of the present invention has the following advantages:

[0071] (1) During refining, a refining agent is added to remove oil, and a cleaning agent is added to remove surfactants, impurities, and polyester oligomers carried by the fabric. The addition of caustic soda can assist the refining agent and cleaning agent, and preliminarily avoid the occurrence of waterproof defects.

[0072] (2) After refining, when the temperature drops to 60-70℃, pressure drainage is carried out to prevent waterproof defects from staining the fabric surface.

[0073] (3) When soaping, a cleaning agent is added to remove the surfactants, impurities and polyester oligomers carried by the dyed fabric. Metal ions such as calcium and magnesium ions in the chelating dispersant can further remove polyester oligomers. Caustic soda can play an auxiliary role in the cleaning agent and the chelating dispersant.

[0074] (4) Control the pre-setting, dyeing and soaping temperature to avoid excessively high temperatures that may cause more waterproof defects.

[0075] (5) Control the refining and setting temperature to prevent the temperature from being too high and affecting the waterproof performance of the fabric.

[0076] 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 description 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 solving waterproof defects, characterized in that: The following steps are involved: Immerse the fabric in water, add 1.0-3.0g / L of scouring agent, 0.5-1.5g / L of caustic soda and 0.5-1.5g / L of cleaning agent, with a bath ratio of 1:10-15, and scour at 80-90℃ for 30-40min; Then, when the temperature drops to 60-70°C, the water is drained under pressure and then dyed. The dyeing temperature is 110-130°C and the dyeing time is 30-50 minutes. Immerse the dyed fabric in water, add 0.5~1.5g / L caustic soda, 0.5~1.5g / L cleaning agent and 1.5~3g / L chelating dispersant, with a bath ratio of 1:10~15, and soap wash at a temperature of 65~75℃ for 30~40min.

2. The dyeing and finishing process for solving waterproof defects according to claim 1, characterized in that: The fabric is subjected to a pre-setting treatment before scouring, and the temperature of the pre-setting treatment is 150-170°C.

3. The dyeing and finishing process for solving waterproof defects according to claim 1, characterized in that: The dyed fabric is firstly subjected to reduction cleaning and then to soap washing.

4. The dyeing and finishing process for solving waterproof defects according to claim 1, characterized in that: The soap-washed fabric is subjected to a setting treatment at a temperature of 150-165°C.

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