Method for imitating old washing and back washing of complex pattern printed fabric

Abstract

The invention discloses a complex pattern printed fabric wash-old and wash-back imitation method which comprises the following steps: A, pretreatment: padding a fabric in an ionic liquid which comprises a quaternary ammonium salt cationic surfactant with the mass concentration of 20-50g / L and the pick-up rate of 60-80% to obtain a product A; b, printing: performing digital printing on the product A to obtain a product B; c, finishing: treating the product B with a finishing liquid which comprises 1-3g / L of a polyurethane and modified acrylic composite cross-linking agent to obtain a product C; d, curing to obtain a product D; and E, washing the product D with water, a stone mill or enzyme to obtain a vintage printing finished product. According to the method, the high-precision, multi-color and complex-pattern vintage washing-out printing style of the fabric can be realized, and the method has the characteristics of energy conservation and environmental protection.

Description

Technical Field

[0001] This invention relates to a method for facilitating the aging process of fabrics, particularly a method for facilitating the aging process of printed fabrics with complex patterns. Background Technology

[0002] The process of creating a distressed fabric effect involves using industrial methods such as physical friction, chemical corrosion, or biological enzyme treatment to artificially simulate the worn, faded, and abrasive state that clothes naturally develop after long-term wear and washing. Some of the dyes on the fabric surface are removed, presenting a natural transition from dark to light, creating a unique retro texture and improving wearing comfort.

[0003] Currently, the most common fading methods are: 1. Washing away printed or dyed pigments; 2. Washing away reactive dyes: Assault and Washlet's snowflake wash will make the fabric surface appear as mottled white spots like snowflakes. However, these fading methods mostly use screen printing, which has limitations in pattern design, making it difficult to achieve complex and personalized designs. They also have problems such as high water consumption, high pollution, and low pattern precision. Summary of the Invention

[0004] The purpose of this invention is to provide a method for fading and aging printed fabrics with complex patterns. This invention can achieve a high-precision, multi-color, and complex pattern fading and aging printing style, and has the characteristics of energy saving and environmental protection.

[0005] The technical solution of this invention: a method for fading and aging complex pattern printed fabrics by washing, comprising the following steps: A. Pretreatment: The fabric is impregnated with an ionic liquid containing a quaternary ammonium salt cationic surfactant with a mass concentration of 20-50 g / L, and the roll-off rate is 60-80% to obtain product A. B. Printing: Digitally print product A to obtain product B; C. Finishing: Product B is treated with a finishing solution, which includes 1-3 g / L of a composite crosslinking agent of polyurethane and modified acrylic to obtain product C. D. Curing: Curing product C by baking at 120℃-150℃ for 3-5 minutes to obtain product D; E. Wash product D with water, stone wash, or enzyme wash to obtain an antique-style printed finished product.

[0006] In the aforementioned method for fading and aging complex pattern printed fabrics, the fabric is cotton, polyester, or a blended fabric.

[0007] In the aforementioned method for fading and aging printed fabrics with complex patterns, the quaternary ammonium salt cationic surfactant in step A is a double long-chain alkyl quaternary ammonium salt cationic surfactant.

[0008] In the aforementioned method for fading and aging of complex pattern printed fabrics, in step C, the finishing solution treatment involves immersing product B in the finishing solution with a pick-up rate of 60-80%.

[0009] In the aforementioned method for fading and aging printed fabrics with complex patterns, the quaternary ammonium salt cationic surfactant in step C is a double long-chain alkyl quaternary ammonium salt cationic surfactant.

[0010] In the aforementioned method for fading and aging of complex pattern printed fabrics, the finishing solution in step C also includes a softener with a mass concentration of 20-60 g / L.

[0011] In the aforementioned method for fading and aging complex pattern printed fabrics, the softener is a textile softener.

[0012] In the aforementioned method for fading and aging complex pattern printed fabrics, the baking temperature in step D is 130-140℃.

[0013] In the aforementioned method for fading and aging of complex pattern printed fabrics, in step E, both stone washing and enzyme washing involve adding 5-10 g / L of enzyme to water and treating at a temperature of 35-45℃ for 10-20 minutes, with a bath ratio of 1:10-1:30.

[0014] Compared with the prior art, the beneficial effects of the present invention are as follows: This invention utilizes digital printing technology to achieve high-precision printing of complex patterns on fabrics. Through the synergistic effect of pretreatment with cationic compounds and composite crosslinking finishing, the concentration of ionic liquid, the ratio of crosslinking agents, and baking conditions are controlled to give the coating a "partially removable" characteristic after curing. The degree of fading can be precisely controlled. After washing, stone washing, or enzyme washing, a natural distressed / washed-out style is formed on the complex patterned fabric. It can achieve a variety of distressed / washed-out style effects from slight wear to heavy fading, while maintaining high color fastness. This solves the problems of high water consumption, high pollution, and low pattern precision in traditional distressed fabric processes.

[0015] The specific principle is as follows: Cationic pretreatment mechanism: The fabric is padded with 20-50 g / L of quaternary ammonium salt cationic surfactant, which gives the fiber surface a positive charge, thereby efficiently adsorbing negatively charged paint and ink particles. This electrostatic adsorption not only improves the accuracy and color saturation of the printed pattern, but also controls the uniformity of paint distribution on the fiber surface, laying the foundation for subsequent distressed effects. Furthermore, the hydrophobic chains in the ammonium salt cationic surfactant enhance the hydrophobic interaction with the fiber, improving the persistence of paint adsorption and promoting localized paint peeling during washing, achieving a more natural fading effect.

[0016] Composite cross-linking curing mechanism: A composite cross-linking agent of polyurethane and modified acrylic is used, and baked and cured at a low temperature (120-150℃). The polyurethane component provides flexibility and elasticity, reducing fiber damage; the modified acrylic component enhances adhesion and durability; when the two are compounded in a mass ratio of 1:1 to 1:2, a "partially detachable" cross-linking network is formed, which allows the coating to maintain a certain degree of firmness after curing, while also allowing for controlled local peeling during garment washing, simulating the appearance of natural washing, and resulting in a soft and comfortable fabric.

[0017] The mechanism of the antique effect: During subsequent water washing, stone washing or enzyme washing, the water flow and mechanical action cause the paint that is not completely fixed to peel off slightly, especially at the edges of the pattern and areas that are frequently rubbed, forming a gradual, faded antique style.

[0018] This invention eliminates the need for water washing and wastewater discharge from pretreatment to curing, resulting in overall water savings of over 90%, thus contributing to water conservation, emission reduction, and environmental safety. It is applicable to various fiber materials and suitable for small-batch, customized production. Attached Figure Description

[0019] Figure 1 This is the D-item diagram of step D in Embodiment 1 of the present invention.

[0020] Figure 2 This is a finished product image of the washed and faded printed fabric according to Embodiment 1 of the present invention.

[0021] Figure 3 This is a finished product image of the washed and faded printed fabric, as shown in Comparative Example 1.

[0022] Figure 4 This is a finished product image of the washed and faded printed fabric from Comparative Example 2. Detailed Implementation

[0023] A method for fading or distressing complex patterned printed fabrics, including the following steps: A. Pretreatment: The fabric is impregnated with an ionic liquid containing a quaternary ammonium salt cationic surfactant with a mass concentration of 20-50 g / L, and the roll-off rate is 60-80% to obtain product A. The preferred quaternary ammonium cationic surfactant is a di-long-chain alkyl quaternary ammonium cationic surfactant, such as C12-C18 quaternary ammonium compounds. Those skilled in the art can select commercially available equivalents based on this description.

[0024] Quaternary ammonium cationic surfactants impart a positive charge to the fiber surface, thereby efficiently adsorbing negatively charged paint and ink particles. This electrostatic adsorption not only improves the precision and color saturation of the printed pattern but also controls the uniformity of paint distribution on the fiber surface, laying the foundation for subsequent antiquing effects. Their hydrophobic chains enhance the hydrophobic interaction with the fiber, improving the persistence of paint adsorption and promoting localized paint peeling during washing, achieving a more natural fading effect.

[0025] By controlling the liquid cationic compound concentration to 20-50 g / L and the residue rate to 60-80%, the amount of coating adsorption is moderate, ensuring both pattern clarity and controllability for subsequent rinsing.

[0026] B. Printing: Digitally print product A according to the required pattern to obtain product B; digital printing technology supports high-precision, multi-color complex patterns, no plate making is required, and the changeover time is short, making it particularly suitable for personalized customization and fast fashion needs.

[0027] C. Finishing: Impregnate product B with finishing solution, with a roll-off rate of 60-80%. The finishing solution includes 1-3 g / L of a composite crosslinking agent of polyurethane and modified acrylic and 20-60 g / L of softener. In the composite crosslinking agent, the mass ratio of polyurethane to modified acrylic is 1:1-1:2, thus obtaining product C. Modified acrylic acid can be obtained from existing Liansheng FH-60 or Huntsman modified acrylic acid products.

[0028] The softener used is a textile softener, such as an amino silicone oil softener. Amino silicone oil softeners not only improve the feel of the fabric but also form an interpenetrating network with the crosslinking agent, enhancing the flexibility of the coating and preventing cracking or excessive peeling during washing.

[0029] By controlling the mass ratio of polyurethane to modified acrylic in the composite crosslinking agent, the finished fabric can achieve the best balance between color fastness (≥4 grade) and distressed effect.

[0030] Controlling the baking temperature can activate the cross-linking reaction without damaging the fibers, making it especially suitable for heat-sensitive blended fabrics (such as cotton / polyester blends) and avoiding fiber yellowing or hardening of the hand feel caused by high temperatures.

[0031] D. Curing: Curing product C at 120℃-150℃ (preferably 130-140℃) for 3-5 minutes to obtain product D; E. Subsequent washing, stone washing, or enzyme washing of product D will yield an antique-style printed finished product.

[0032] Both stone washing and enzyme washing involve adding 5-10 g / L of enzyme to water and washing at 35-45℃ for 10-20 minutes, with a bath ratio of 1:10-1:30. Adjustments can be made as needed during actual operation.

[0033] Enzymatic washing selectively degrades coating adhesion points on the fiber surface, promoting localized peeling while maintaining overall colorfastness. Combined with other steps, it synergistically achieves a natural "washed-old" appearance.

[0034] The resulting printed fabric has a fine printed pattern, exhibits a natural fading effect after washing, and has a color fastness of level 4 or higher.

[0035] The fabric is a common commercially available fabric such as cotton, polyester, or blended fabric.

[0036] The present invention will be further described below with reference to embodiments, but these embodiments are not intended to limit the scope of the invention.

[0037] Example 1: Taking 100% cotton fabric as an example, a method for fading or aging complex pattern printed fabric includes the following steps: A. Pretreatment: Impregnate 100% cotton fabric with an ionic liquid containing a C18 quaternary ammonium salt compound with a mass concentration of 40 g / L and a roll-off rate of 70%, so that the cations are adsorbed on the surface of the fabric to obtain product A. B. Printing: Use a Konica digital printing machine to print product A according to the required pattern. The printing resolution is 600-1200 dpi. The ink is pigment ink, which has high pattern accuracy and is suitable for complex patterns, resulting in product B. C. Finishing: Product B is impregnated with a finishing solution, with a roll-off rate of 70%. The finishing solution includes 3 g / L of a polyurethane-modified acrylic composite crosslinking agent and 40 g / L of an amino silicone oil softener. In the composite crosslinking agent, the mass ratio of polyurethane to modified acrylic is 1:1.5, yielding product C. The modified acrylic is FH-60 modified acrylic from Zhejiang Liansheng Chemical Co., Ltd.

[0038] D. Curing: Curing product C by baking at 135℃ for 3 minutes yields product D. For example... Figure 1 As shown, the printed fabric has a fine printed pattern, and the fabric has not been washed at this time.

[0039] E. Subsequent garment washing of product D, with a washing temperature of 35-45℃, a liquor ratio of 1:10-1:30, and a washing time of 10-20 minutes. The resulting printed fabric product after washing is as follows: Figure 2 As shown, the fabric exhibits a natural wash-out style, with moderate color fading, clear patterns, and noticeable fading texture on the trouser legs. The colorfastness is grade 5.

[0040] Comparative Example 1: This comparative example is basically the same as Example 1, except that the mass concentration of the dual long-chain alkyl quaternary ammonium salt cationic surfactant is 10 g / L. After washing, the resulting printed fabric is as follows: Figure 3 As shown, the color absorption is insufficient, the color fastness is very poor and uneven, the resulting printed fabric fades severely, and the style cannot be perfectly presented after washing.

[0041] Comparative Example 2: This comparative example is basically the same as Example 1, except that: the mass concentration of the dual long-chain alkyl quaternary ammonium salt cationic surfactant is 70 g / L; and the mass ratio of polyurethane to modified acrylic is 1:3.

[0042] After washing, the finished printed fabric is as follows: Figure 4 As shown, the pattern is stiff, the color fastness is too good, there is very little color fading, and there is no washing effect.

[0043] Comparative Example 3: This comparative example is basically the same as Example 1, except that the mass ratio of polyurethane to modified acrylic in the composite crosslinking agent is 1:0.8. The resulting printed fabric, due to excessive crosslinking, is difficult to wash and remove, and lacks an antique finish.

[0044] Comparative Example 4: This comparative example is basically the same as Example 1, except that the mass ratio of polyurethane to modified acrylic in the composite crosslinking agent is 1:2.5. Due to insufficient crosslinking, the resulting printed fabric is prone to excessive coating peeling, and the washing and fading effect is uncontrollable.

[0045] It should be understood that the above embodiments are only used to illustrate the technical solutions of the present invention, and are not intended to limit them. Those skilled in the art can modify the technical solutions described in the above embodiments, or make equivalent substitutions for some of the technical features; and all such modifications and substitutions should fall within the protection scope of the appended claims of the present invention.

Claims

1. A method for washing, fading and washing-out of printed fabric with complex pattern, characterized in that: Includes the following steps: A. Pretreatment: The fabric is impregnated with an ionic liquid containing a quaternary ammonium salt cationic surfactant with a mass concentration of 20-50 g / L, and the roll-off rate is 60-80% to obtain product A. B. Printing: Digitally print product A to obtain product B; C. Finishing: Product B is treated with a finishing solution, which includes 1-3 g / L of a composite crosslinking agent of polyurethane and modified acrylic to obtain product C. D. Curing: Curing product C by baking at 120℃-150℃ for 3-5 minutes to obtain product D; E. Wash product D with water, stone wash, or enzyme wash to obtain an antique-style printed finished product.

2. The method according to claim 1, wherein the complex pattern printed fabric is washed to look old and washed out. The fabric is cotton, polyester, or a blended fabric.

3. The method for fading and aging complex pattern printed fabrics according to claim 1, characterized in that: The quaternary ammonium salt cationic surfactant in step A is a dual long-chain alkyl quaternary ammonium salt cationic surfactant.

4. The method for fading and aging complex pattern printed fabrics according to claim 1, characterized in that: In step C, the finishing solution treatment method is to immerse product B in the finishing solution, with a roll-off rate of 60-80%.

5. The method for fading and aging complex pattern printed fabrics according to claim 1, characterized in that: In the composite crosslinking agent of step C, the mass ratio of polyurethane to modified acrylic is 1:1 to 1:

2.

6. The method for fading and aging complex pattern printed fabrics according to claim 1, characterized in that: The finishing solution in step C also includes a softener with a mass concentration of 20-60 g / L.

7. The method for fading and aging complex pattern printed fabrics according to claim 6, characterized in that: The softener is a textile softener.

8. The method for fading and aging complex pattern printed fabrics according to claim 1, characterized in that: In step D, the baking temperature is 130-140℃.

9. The method for fading and aging complex pattern printed fabrics according to claim 1, characterized in that: In step E, both stone washing and enzyme washing involve adding 5-10 g / L of enzyme to water and treating at 35-45℃ for 10-20 minutes with a bath ratio of 1:10-1:30.

Images