Finishing method for improving fastness of composite elastic fiber fabric

Abstract

The invention relates to the technical field of textile fiber processing, in particular to a finishing method for improving the fastness of a composite elastic fiber fabric. The finishing method comprises a shrinking process, a presetting process, a dyeing process and a reduction washing process which are performed in sequence, and the reduction washing process comprises acid reduction washing and alkaline reduction washing which are performed in sequence. According to the finishing method, the problems of size change, non-uniform dyeing and the like during fiber dyeing are solved through a shrinking process and a preset process. After dyeing, sequentially carrying out acid reduction washing and alkaline reduction washing so as to control the color depth and fastness of the dyed fiber.

Description

Technical Field

[0001] The invention relates to the technical field of textile fiber processing, in particular to a finishing method for improving the fastness of composite elastic fiber fabric. Background Art

[0002] Composite elastic fibers such as T400 and T8 have a low glass transition temperature of only 50~60°C due to the presence of PTT or PBT. For example, the Chinese invention patent with application number 202011553875.6 discloses a two-component elastic fiber dyeing process containing PBT. The elastic fiber is dyed by rinsing, dehumidifying, dyeing, washing, dehydrating and drying in sequence, and the dyeing temperature must reach at least 100°C (boiling dye solution). It can be seen that its dyeing temperature is significantly higher than the glass transition temperature, which will lead to violent intermolecular movement, larger gaps between fibers, and dye leakage, resulting in poor fiber fastness such as sweat fastness, soap fastness, and solvent fastness. Summary of the invention

[0003] The technical problem to be solved by the present invention is to provide a finishing method for improving the fastness of composite elastic fiber fabric.

[0004] In order to solve the above technical problems, the technical solution adopted by the present invention is: a finishing method for improving the fastness of composite elastic fiber fabric, comprising a shrinking process, a predetermined process, a dyeing process and a reduction washing process performed in sequence, and the reduction washing process comprises acid reduction washing and alkaline reduction washing performed in sequence.

[0005] The beneficial effects of the present invention are as follows: the finishing method for improving the fastness of composite elastic fiber fabrics of the present invention firstly avoids the problems of size change and uneven dyeing when the fibers are dyed through a refining process and a predetermined process. After dyeing, acid reduction washing and alkaline reduction washing are sequentially performed to control the color depth and fastness of the dyed fibers. DETAILED DESCRIPTION

[0006] In order to explain the technical content, achieved objectives and effects of the present invention in detail, the following is an explanation in conjunction with the implementation modes.

[0007] A finishing method for improving the fastness of composite elastic fiber fabrics comprises a shrinking process, a predetermined process, a dyeing process and a reduction washing process which are carried out in sequence, wherein the reduction washing process comprises acid reduction washing and alkaline reduction washing which are carried out in sequence.

[0008] From the above description, it can be seen that the beneficial effect of the present invention is that: in view of the problem that the fastness of composite elastic fiber fabrics containing T400, T8, etc. is poor, the present invention provides a finishing method for improving the fastness of composite elastic fibers. The finishing method first controls the size and shrinkage of the fiber through a shrinking process and a predetermined process to prevent the fiber from shrinking too much after subsequent dyeing, causing size changes and uneven dyeing.

[0009] The color fading rate of single acid-washed fiber is high; due to the low glass transition temperature of elastic composite fiber, single alkali washing makes the color of the dyed fiber lighter. The present invention performs acid reduction washing and alkaline reduction washing in sequence after dyeing, which can effectively reduce the color fading rate and prevent the dyed color from becoming lighter.

[0010] Furthermore, the temperature of the reduction process is 65-80° C., and the vehicle speed is 20-22 m / min.

[0011] Furthermore, the temperature of the predetermined process is 170-190°C.

[0012] From the above description, it can be seen that due to the yarn characteristics of the composite elastic fiber, the size of the fiber cannot be completely fixed if only the predetermined process is used to shrink the fiber by temperature, and the subsequent dyeing will continue to shrink. Therefore, the present invention first uses the refining process to control the shrinkage of the fiber to prevent the shrinkage from being too large, so that the size after subsequent dyeing is close to the size after refining, and then a higher temperature is predetermined to stabilize the size of the fiber and keep it flat.

[0013] Furthermore, the temperature of the dyeing process is 120-135°C.

[0014] From the above description, it can be seen that too high a dyeing temperature will cause the elasticity of the composite elastic fiber to deteriorate, and too low a temperature will affect the color depth of the dyeing. Therefore, the temperature of the dyeing process is controlled to be 120-135°C in the present invention.

[0015] Furthermore, the dye used in the dyeing process is a macromolecular dye.

[0016] From the above description, it can be seen that the molecules of macromolecular dyes are large and the dyes are not easy to seep out.

[0017] Furthermore, 2-4 g / L of acidic reducing detergent and 0.1-0.5 g / L of citric acid are added to the acidic reducing washing.

[0018] From the above description, it can be seen that adding citric acid to the acid reduction wash can improve the stability.

[0019] Furthermore, the temperature of the acid reduction washing is 80-90° C., and the bath ratio is 1:10-15.

[0020] Furthermore, 1~1.5g / L of flake caustic soda, 2~4g / L of hydrosulfite, 2~4g / L of liquid reducing detergent and 2~4g / L of anti-staining soap detergent are added to the alkaline reducing washing.

[0021] From the above description, it can be seen that the present invention adds a liquid reducing detergent and an anti-staining soaping agent during alkaline reducing washing. The weak reducing and cleaning properties of the liquid reducing detergent are combined with the dispersibility and cleaning properties of the anti-staining soaping agent to enhance the cleaning fastness, making it easier to clean the composite elastic fiber from staining and prevent the dye from back-staining the fiber.

[0022] The conventional dosage of caustic soda is 1-1.5 g / L. The present invention aims to reduce the properties of the composite elastic fiber and reduce the caustic soda content, which can play a role in reducing the degree of dye stripping.

[0023] Furthermore, the temperature of the alkaline reduction washing is 75-85°C, and the bath ratio is 1:10-15.

[0024] From the above description, it can be seen that the temperature is adjusted, and the alkaline reduction washing of the present invention is set 5°C lower than the temperature of the conventional process; Furthermore, during alkaline reduction washing, 1~1.5g / L of flake caustic soda and 2~4g / L of anti-staining soap detergent are first added at room temperature, then the temperature is raised to 75~85°C and 2~4g / L of insurance powder is added, and after a period of reaction, 2~4g / L of liquid reduction detergent is added.

[0025] From the above description, it can be seen that the reaction time of the insurance powder is relatively fast. The present invention controls the order of adding alkaline materials. After heating, the insurance powder is first added to reduce the residual liquid or the floating color on the fiber surface, and then the liquid reducing cleaning agent is added to reduce the remaining residual liquid and floating color again, thereby improving the reaction efficiency and the effect of removing the floating color and achieving sufficient reduction.

[0026] Furthermore, the reduction washing step is followed by a setting step.

[0027] Furthermore, 1-3 wt% fastness enhancer and 3-5 g / L cationic color fixing agent are added in the finishing process.

[0028] From the above description, it can be seen that the fastness enhancer itself can only prevent the dye from migrating to the fiber surface and improve the water fastness. The present invention combines the fastness enhancer with the cationic color fixing agent to produce a cross-linking reaction to form a film, which prevents the fiber with a lower glass transition temperature from expanding and the aqueous solution from penetrating; at the same time, a weak charge force is generated between the two additives to reduce the overflow of the dye, so as to improve the color transfer fastness, solvent fastness and soap fastness.

[0029] Furthermore, the temperature of the forming process is 150-160°C and the vehicle speed is 20-25 m / min.

[0030] From the above description, it can be seen that when the temperature of the setting process is higher than 160°C, it will cause dye migration and reduce sublimation fastness, and when it is lower than 150°C, it will cause large changes in fiber shrinkage and poor control of fiber size.

[0031] Embodiment 1 of the present invention is: a finishing method for improving the fastness of a composite elastic fiber fabric, the fabric comprises T400 and polyester, the content of T400 is 40wt%, and the steps are as follows: S1. Shrinking process: It is carried out in a Monforts hot air stentering machine at a temperature of 70°C and a speed of 20 m / min.

[0032] S2. Scheduled process: carried out in a Monforts hot air stentering machine at a temperature of 170°C and a speed of 20 m / min.

[0033] S3. Dyeing process: It is carried out in an Ithaca overflow dyeing machine at a temperature of 120°C and a dyeing time of 30 minutes. The dye is a macromolecular dye (manufacturer: An Ruoqi, model: PUD).

[0034] S4, reduction washing process S41. Acid reduction washing: It is carried out in an Ithaca overflow dyeing machine, adding 2.5g / L of acid reduction detergent and 0.3g / L of citric acid, the temperature is 80℃, and the bath ratio is 1:10.

[0035] S42. Alkaline reduction washing: It is carried out in an Ithaca overflow dyeing machine with a bath ratio of 1:10. During alkaline reduction washing, first add 1.1g / L of flake caustic soda and 2.5g / L of rc-335 anti-staining soap detergent (manufacturer: Kunshan Mingjia) at room temperature, then heat to 75℃ and add 2.3g / L of hydrosulfite. After reacting for 10 minutes, add 2.5g / L of liquid reduction detergent (manufacturer: Putian Dakai, model: J03T).

[0036] S5, setting process: carried out in the Monfushi hot air stenter setting machine, adding 2wt% fastness enhancer (manufacturer: Liansheng model: TS-01) and 3g / L cationic color fixing agent (manufacturer: Green Spinning model: HCF), the temperature is 150℃, and the speed is 20m / min.

[0037] Comparative Example 1 of the present invention is: The difference between Comparative Example 1 and Example 1 is that no alkaline reduction washing is performed.

[0038] Comparative Example 2 of the present invention is: The difference between Comparative Example 2 and Example 1 is that two alkaline reduction washes are performed, and no acid reduction wash is performed.

[0039] Comparative Example 3 of the present invention is: The only difference between Comparative Example 3 and Example 1 is that no anti-staining soaping agent is added in the alkaline reduction washing.

[0040] Comparative Example 4 of the present invention is: The only difference between Comparative Example 4 and Example 1 is that no liquid reducing detergent is added in the alkaline reducing washing.

[0041] Comparative Example 5 of the present invention is: The only difference between Comparative Example 5 and Example 1 is that no fastness enhancer is added in the forming process.

[0042] The fastness of the finished fabrics of Example 1 and Comparative Examples 1 to 5 after finishing was tested, and the test results are shown in Table 1. The test standards for fastness to rubbing, color fastness to soaping, and color fastness to perspiration are GBT 3920-2008, GBT 3921-2008, and GB / T 3922-2013, respectively; The test method for color fastness of textiles to water is: Step 1: Cut the fabric samples to be tested with the same specifications respectively. The fabric to be tested is a standard adjacent fabric that has been bleached, dyed and splashed, and prepare a soap solution reagent with a concentration of 10g / L; Step 2: Fix and overlap the standard adjacent fabric on the fabric sample to be tested to make a combined sample; Step 3: Immerse the combined sample in the soap solution reagent and let it stand for testing; Step 4: Take out the combined sample, clean it, and disassemble it; Step 5: Dry the standard adjacent fabric and the fabric sample to be tested separately; use the grey standard sample card to rate and compare with the standard adjacent fabric and the fabric sample to be tested to measure the color fastness to water immersion.

[0043] Table 1

[0044] Embodiment 2 of the present invention is: a finishing method for improving the fastness of a composite elastic fiber fabric, the fabric comprises T8 and polyester, the content of T8 is 30wt%, and the steps are as follows: S1. Shrinking process: It is carried out in a Monforts hot air stentering machine at a temperature of 65°C and a speed of 21 m / min.

[0045] S2. Scheduled process: carried out in a Monforts hot air stenter setting machine at a temperature of 190°C and a speed of 21 m / min.

[0046] S3. Dyeing process: It is carried out in an Ithaca overflow dyeing machine at a temperature of 135°C and a dyeing time of 30 minutes. The dye is a macromolecular dye.

[0047] S4, reduction washing process S41. Acid reduction washing: It is carried out in an Ithaca overflow dyeing machine, adding 2g / L of acid reduction detergent and 0.1g / L of citric acid, the temperature is 90°C, and the bath ratio is 1:15.

[0048] S42. Alkaline reduction washing: It is carried out in an Ithaca overflow dyeing machine with a bath ratio of 1:15. During alkaline reduction washing, first add 1g / L of flake caustic soda and 2g / L of rc-335 anti-stain soap detergent at room temperature, then heat to 80°C and add 2g / L of hydrosulfite. After reacting for 10 minutes, add 2g / L of liquid reduction detergent.

[0049] S5, setting process: carried out in a Monforts hot air stenter setting machine, adding 1wt% fastness enhancer and 4g / L cationic color fixing agent, the temperature is 155℃, and the speed is 21m / min.

[0050] Embodiment 3 of the present invention is: a finishing method for improving the fastness of a composite elastic fiber fabric, the fabric comprises T8 and polyester, the content of T8 is 30wt%, and the steps are as follows: S1. Shrinking process: It is carried out in a Monforts hot air stenter setting machine at a temperature of 80°C and a speed of 22m / min.

[0051] S2. Scheduled process: carried out in a Monforts hot air stenter setting machine at a temperature of 175°C and a speed of 22 m / min.

[0052] S3. Dyeing process: It is carried out in an Ithaca overflow dyeing machine at a temperature of 125°C and a dyeing time of 30 minutes. The dye is a macromolecular dye.

[0053] S4, reduction washing process S41. Acid reduction washing: It is carried out in an Ithaca overflow dyeing machine, adding 3g / L of acid reduction detergent and 0.5g / L of citric acid, the temperature is 85°C, and the bath ratio is 1:12.

[0054] S42. Alkaline reduction washing: It is carried out in an Ithaca overflow dyeing machine with a bath ratio of 1:12. During alkaline reduction washing, first add 1.5g / L of flake caustic soda and 4g / L of rc-335 anti-stain soap detergent at room temperature, then heat to 85°C and add 4g / L of hydrosulfite. After reacting for 10 minutes, add 4g / L of liquid reduction detergent.

[0055] S5, setting process: carried out in a Monforts hot air stenter setting machine, adding 3wt% fastness enhancer and 5g / L cationic color fixing agent, the temperature is 160℃, and the speed is 25m / min.

[0056] In summary, the finishing method for improving the fastness of composite elastic fiber fabric provided by the present invention has the following advantages: 1. By using the shrinking process and the predetermined process to control the size and shrinkage of the fiber before dyeing, problems such as size change and uneven dyeing after dyeing can be prevented.

[0057] 2. After dyeing, carry out acid reduction washing and alkaline reduction washing in sequence to effectively reduce the color fading rate and prevent the dyeing color from becoming lighter; add liquid reduction detergent and anti-stain soap detergent in the alkaline reduction washing to enhance the cleaning fastness; at the same time, by controlling the order of adding materials in the alkaline reduction washing, the reaction efficiency and the effect of removing floating color can be improved.

[0058] 3. Balance the elasticity of composite elastic fibers and the depth of dyeing color by controlling the dyeing process, and use macromolecular dyes during dyeing to reduce dye seepage.

[0059] 4. According to the characteristics of composite elastic fiber fabrics, the caustic soda content is reduced to reduce the degree of dye stripping.

[0060] 5. Add fastness enhancer and cationic fixing agent in the setting process, which will produce cross-linking reaction to form a film, reducing the penetration of aqueous solution and dye overflow.

[0061] 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 specification of the present invention, or directly or indirectly applied in related technical fields, are also included in the patent protection scope of the present invention.

Claims

1. A finishing method for improving the fastness of composite elastic fiber fabrics, characterized in that: The method comprises a refining process, a predetermined process, a dyeing process and a reduction washing process which are carried out in sequence, wherein the reduction washing process comprises an acid reduction washing and an alkaline reduction washing which are carried out in sequence.

2. The finishing method for improving the fastness of composite elastic fiber fabric according to claim 1, characterized in that: The temperature of the reduction process is 65-80° C., and the vehicle speed is 20-22 m / min.

3. The finishing method for improving the fastness of composite elastic fiber fabric according to claim 1, characterized in that: The temperature of the dyeing process is 120-135°C.

4. The finishing method for improving the fastness of composite elastic fiber fabric according to claim 1, characterized in that: The dye used in the dyeing process is a macromolecular dye.

5. The finishing method for improving the fastness of composite elastic fiber fabric according to claim 1, characterized in that: 2-4 g / L of acidic reducing detergent and 0.1-0.5 g / L of citric acid are added to the acidic reducing washing.

6. The finishing method for improving the fastness of composite elastic fiber fabric according to claim 1, characterized in that: The temperature of the acid reduction washing is 80-90° C., and the bath ratio is 1:10-15.

7. The finishing method for improving the fastness of composite elastic fiber fabric according to claim 1, characterized in that: In the alkaline reduction washing, 1-1.5 g / L of flake caustic soda, 2-4 g / L of hydrosulfite, 2-4 g / L of liquid reduction detergent and 2-4 g / L of anti-staining soap detergent are added.

8. The finishing method for improving the fastness of composite elastic fiber fabric according to claim 1, characterized in that: The temperature of the alkaline reduction washing is 75-85° C., and the bath ratio is 1:10-15.

9. The finishing method for improving the fastness of composite elastic fiber fabric according to claim 1, characterized in that: The reduction washing step is followed by a setting step.

10. The finishing method for improving the fastness of composite elastic fiber fabric according to claim 9, characterized in that: In the fixing process, 1-3 wt% of a fastness enhancer and 3-5 g / L of a cationic color fixing agent are added.

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