Printing method of brocade / cotton blended fabric

Abstract

The invention provides a printing method of a brocade / cotton blended fabric, and belongs to the technical field of fabric dyeing and finishing. The printing method comprises the following steps: carrying out printing pretreatment on gray fabric, wherein the gray fabric is a brocade / cotton blended fabric; printing the brocade / cotton blended fabric subjected to the printing pretreatment to obtain a printed fabric; acidic / indanthrene printing paste is adopted for printing and comprises acidic dye, indanthrene dye, a thickening agent, urea, ammonium sulfate and water; the printing sequentially comprises printing, drying, ageing, flash evaporation and oxidation, the flash evaporation temperature is higher than the ageing temperature, and the flash evaporation time is shorter than the ageing time. The effect that two kinds of fibers are consistent in color obtaining can be achieved in a same paste printing mode, the obtained printed fabric is full and bright in color, high in color fastness, clean in cloth cover, clear in pattern contour and stable in product quality, and the method has the advantages of being simple in process, saving energy, being environmentally friendly and the like.

Description

Technical Field

[0001] The invention relates to the technical field of fabric dyeing and finishing, in particular to a printing method for a brocade / cotton blended fabric. Background Art

[0002] Nylon / cotton blended fabric is a blend of nylon and cotton. It is becoming more and more popular among consumers due to its good hand feel, high strength, good wear resistance, good air permeability and comfortable wearing. It is now widely used in industrial, civil and national defense fields. In the field of fabric printing and dyeing, the dyeing process of nylon / cotton blended fabric is basically mature, and its dyed products have been popular in the market for a long time.

[0003] However, the printing process of nylon / cotton blended fabrics is still difficult. The difficulty lies in that nylon / cotton blended fabrics must be printed with the same slurry during printing. Nylon, also known as nylon, has a large number of polar amide groups, non-polar methylene groups, amino groups and hydroxyl groups on its molecular chain, so the main dyes for nylon printing are acid dyes. In addition, the cross-section of nylon fiber is nearly circular, with a skin-core structure. The skin has a high degree of orientation and a low degree of crystallinity, while the core has a low degree of orientation and a high degree of crystallinity. Since the skin of nylon fiber has low crystallinity and more amorphous areas, it can also be printed with disperse dyes. However, disperse dyes are only suitable for lighter colors, so the best dyes for printing are still acid dyes. In the printing process, cotton fibers mainly use reactive dyes, vat dyes and coatings, among which reactive printing is the most widely used and has better performance.

[0004] Acid dyes and reactive dyes (usually printed and dyed under alkaline conditions) require different pH values, so nylon / cotton blended fabrics are not suitable for printing with acid and reactive dyes. The conventional practice is to select the process according to the different nylon-cotton blending quality ratios, color fastness and fabric requirements. For blended fabrics with a smaller nylon ratio (for example, a nylon / cotton blending ratio of 20 / 80 or 30 / 70), a pure cotton fabric printing process can be used; for fabrics with a larger nylon ratio (for example, a nylon / cotton blending ratio of 50 / 50 or 45 / 55), reactive printing processes and paint printing processes are used. However, such conventional printing processes have problems such as color difference and low fastness. Summary of the invention

[0005] In view of the fact that the prior art is easily limited by the requirements of the blending ratio, color yield, color fastness and the like of nylon / cotton blended fabrics, and has the problems of color difference and low fastness, the present invention provides a printing method for nylon / cotton blended fabrics. The printing method of the present invention has a simple process, and the same slurry printing can achieve the effects of consistent color yield and high fastness of two fibers.

[0006] The present invention provides a printing method for a brocade / cotton blended fabric, comprising the following steps:

[0007] S1. performing pre-printing treatment on the grey cloth, wherein the grey cloth is a brocade / cotton blended fabric;

[0008] S2, printing the brocade / cotton blended fabric that has undergone the printing pre-treatment to obtain a printed fabric;

[0009] The printing adopts acid / Shilin printing paste, which includes acid dye, Shilin dye, thickener, urea, ammonium sulfate and water; the mass percentage of nylon in the nylon / cotton blended fabric is 10% to 80%;

[0010] The printing process includes printing, drying, evaporation, flash evaporation and oxidation in sequence. The temperature of the flash evaporation is higher than the temperature of the evaporation, and the time of the flash evaporation is shorter than the time of the evaporation.

[0011] In an embodiment of the present invention, the pre-printing treatment in step S1 includes seam turning, singeing, desizing, shaping, mercerizing and weft straightening of the grey cloth.

[0012] In an embodiment of the present invention, in step S2, the printing paste has the following composition per 100 parts by mass:

[0013] 1-8 parts of acid dye, 1-8 parts of Shilin dye, 2-5 parts of thickener, 5-10 parts of urea, 0.5-1.5 parts of ammonium sulfate and the balance of water; the thickener is a polyhydroxy high molecular polymer.

[0014] In an embodiment of the present invention, in step S2, the drying temperature is 100° C. to 140° C., and the drying time is 2 minutes to 4 minutes.

[0015] In an embodiment of the present invention, in step S2, the evaporation is performed using saturated steam at a temperature of 100° C. to 105° C., and the evaporation time is 15 minutes to 30 minutes.

[0016] In an embodiment of the present invention, in step S2, the flash evaporation temperature is 130° C. to 139° C., and the flash evaporation time is 20 seconds to 40 seconds.

[0017] In an embodiment of the present invention, in step S2, the flash evaporation process includes applying a reducing solution, wherein the reducing solution includes sodium hydroxide and hydrosulfite, the concentration of sodium hydroxide is 80-100 g / L, and the concentration of hydrosulfite is 80-110 g / L.

[0018] In an embodiment of the present invention, in step S2, the materials involved in the oxidation include hydrogen peroxide and glacial acetic acid, the oxidation temperature is 10° C. to 35° C., and the oxidation time is 20 seconds to 40 seconds.

[0019] In an embodiment of the present invention, the printing further includes washing and drying to obtain a finished printed fabric.

[0020] In the embodiments of the present invention, the dry friction color fastness of the printed fabric is above level 4; the color is rich and bright, the color fastness is high, the fabric surface is clean, the flower shape outline is clear, and the product quality is stable.

[0021] Compared with the prior art, the present invention proposes a one-step printing process for nylon-cotton blended fabrics, which adopts the same slurry direct printing method of acid dyes and Shilin dyes, the printing slurry includes acid dyes, Shilin dyes, thickeners, urea, ammonium sulfate and water, and the process includes printing, drying, steaming, flash evaporation and oxidation, so as to obtain printed fabrics. The printing method of the present invention has a simple process. Due to the particularity of nylon fiber, the same slurry printing method can achieve the effect of consistent color of the two fibers. The obtained printed fabric has rich and rich colors, high color fastness, clean cloth surface, clear flower shape outline, stable product quality, and also has the advantages of energy saving and environmental protection. DETAILED DESCRIPTION

[0022] In order to enable those skilled in the art to better understand the technical solution of the present invention, the technical solution in the embodiment of the present invention will be clearly and completely described below. Obviously, the described embodiment is only a part of the embodiment of the present invention, not all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work should fall within the scope of protection of the present invention.

[0023] The present invention provides a printing method for a brocade / cotton blended fabric, comprising the following steps:

[0024] S1. performing pre-printing treatment on the grey cloth, wherein the grey cloth is a brocade / cotton blended fabric;

[0025] S2, printing the brocade / cotton blended fabric that has undergone the printing pre-treatment to obtain a printed fabric;

[0026] The printing adopts acid / Shilin printing paste, which includes acid dye, Shilin dye, thickener, urea, ammonium sulfate and water; the mass percentage of nylon in the nylon / cotton blended fabric is 10% to 80%;

[0027] The printing process includes printing, drying, evaporation, flash evaporation and oxidation in sequence. The temperature of the flash evaporation is higher than the temperature of the evaporation, and the time of the flash evaporation is shorter than the time of the evaporation.

[0028] The printing method of brocade / cotton blended fabric provided by the invention can simplify the process flow, and can achieve the effects of consistent color of two fibers, rich and gorgeous color of printed fabric, high color fastness, clean fabric surface, clear flower shape outline, stable product quality and the like.

[0029] The acid / Shilin printing paste is prepared in the embodiment of the present invention. The printing paste formula composition per 100 parts by mass is: 1-8 parts of acid dye, 1-8 parts of Shilin dye, 2-5 parts of thickener, 5-10 parts of urea, 0.5-1.5 parts of ammonium sulfate and the balance of water.

[0030] Traditional acid dyes refer to water-soluble dyes containing acidic groups, which can be divided into three types of dyes for strong acid bath, weak acid bath and neutral bath dyeing; most of them are aromatic sulfonic acid sodium salts in structure, and azo (monoazo and disazo are the most) and anthraquinone account for a large proportion in their chromophore structure, in addition to various types of chromophores such as triarylmethane, indigo, quinoline, phthalocyanine and nitroimide; metal complex acid dyes are also included. In the printing method of the embodiment of the present invention, the selection of the acid dye is crucial, because the reduction dye needs to be reduced to a soluble, leuco sodium salt with affinity to cellulose fibers by a reducing agent under alkaline conditions when fixing the color, and most of the acid dyes are not alkali-resistant and will decompose under alkaline conditions, so the acid dyes used are selected as weakly acidic or metal complex dyes as much as possible. For example, the present invention can use the NHF-S series of Dystar, such as NHF-S blue, NHF-S yellow, NHF-S red or 2S-LD black.

[0031] Shilin dyes are also called vat dyes, including anthraquinone, indigo, heterocyclic and sulfate derivatives, etc. Most of them need to be reduced before they can dye the fibers. The present invention has no special restrictions on the type of Shilin dyes. In some embodiments of the present invention, the Shilin dyes can be CLF blue, BR brown, F3GC yellow, R olive, 2R red, etc. produced by Jiangsu Yabang Dye Co., Ltd.

[0032] The present invention preferably mixes 2 to 6 parts by mass of acid dyes and 2 to 6 parts by mass of Shilin dyes to form an acid / Shilin printing paste. In terms of mass parts, the auxiliary materials (also called printing paste) of the printing paste are composed of: 2 to 5 parts of thickener, 5 to 10 parts of urea, 0.5 to 1.5 parts of ammonium sulfate, and the balance of water, which makes up 100% of the paste. In a specific embodiment of the present invention, a mixed slurry is obtained by using a thickener, urea, ammonium sulfate and water, and then 1 to 5% of the acid dye is added to the obtained mixed slurry, and after stirring evenly, 1 to 5% of the reducing dye is added (it can be added to an appropriate amount of water and then added to the color paste), and the acid / Shilin printing paste is obtained by stirring evenly. The viscosity of the printing color paste is 10000-25000mPa.s. Generally, the printing paste is prepared at room temperature (such as 15°C to 30°C temperature conditions). It should be noted that the temperature cannot be too high, otherwise the reducing dye will condense due to overheating.

[0033] Among them, the thickener is preferably a polyhydroxy polymer, and specifically a thickener DT-F (provided by Shandong Yellow River Delta Textile Science and Technology Research Institute Co., Ltd.) can be selected. The polycarboxyl polymer has the characteristics of good level dyeing, good water holding property, and no back bleed, which can make the printed pattern outline more delicate, and has the characteristics of high de-paste rate and soft hand feel. The urea is used as a cosolvent, and the preferred amount is 10 parts by mass; the ammonium sulfate is mainly used to adjust the acidity and alkalinity, and the preferred amount is 1 part by mass.

[0034] In the embodiment of the present invention, the grey cloth is subjected to pre-printing treatment, and the grey cloth is a nylon / cotton blended fabric. The pre-printing treatment mainly includes seam turning, singeing, desizing, shaping, mercerizing and weft straightening of the grey cloth, which are all process operations well known to those skilled in the art.

[0035] The embodiment of the present invention is directed to one-step printing of nylon / cotton blended fabrics. There is no special restriction on the blending ratio of nylon / cotton blended grey fabrics, wherein the mass percentage of nylon can be between 10% and 80%, for example, 40% to 60%. In some specific embodiments of the present invention, the specifications of the nylon / cotton blended fabric are nylon 50 / cotton 50 (mass ratio), 34 / 2x34 / 2 54x48 1 / 2, and gram weight 178g / m 2 After pre-printing treatment, the hair effect is 6cm and the whiteness is 79%.

[0036] In the embodiment of the present invention, the nylon / cotton blended grey fabric is subjected to same slurry printing, the acid / silk printing slurry is printed, and then the printing process is realized by drying, steaming, flashing and oxidizing in sequence, and then the printing process is completed, and then the printing process is performed by washing, drying and other treatments.

[0037] In an embodiment of the present invention, the drying temperature may be 100-140°C, preferably 120-130°C, and specifically 110°C; the drying time may be 2 minutes to 4 minutes, specifically 3 minutes. The evaporation temperature may be 100-105°C; the evaporation time may be 15 minutes to 30 minutes, preferably 18-22 minutes, and specifically 20 minutes at 102°C. The flash evaporation temperature may be 130-139°C, preferably 130-135°C; the flash evaporation time may be 20 seconds to 30 seconds, and specifically 25 seconds at 132°C. The reducing liquid applied in the flash evaporation process is sodium hydroxide and insurance powder, the amount of sodium hydroxide may be 80-100g / L, the amount of insurance powder may be 80-110g / L, specifically 80g / L of sodium hydroxide and 90g / L of insurance powder. The embodiment of the present invention preferably controls the printing process, which is beneficial to improving the printing fastness, etc.

[0038] The embodiment of the present invention preferably further includes cold water washing between the flash evaporation and oxidation steps to fully remove the flash reduction liquid components so as to facilitate the subsequent steps. Preferably, the cold water washing temperature can be 10°C-35°C, and the cold water washing time can be 1-3 minutes, specifically, the cold water washing can be performed at 20°C for 1 minute.

[0039] In an embodiment of the present invention, the oxidation materials are hydrogen peroxide and glacial acetic acid, the oxidation temperature can be 10°C-35°C, the oxidation time can be 20-40 seconds, and specifically, the oxidation can be performed at 20°C for 28 seconds.

[0040] The printing described in the embodiment of the present invention also includes washing and drying to obtain a finished printed fabric. The washing and drying are both conventional operations in the field and are not particularly limited. The washing is generally hot water washing, the hot water washing temperature can be 95°C-98°C, the washing time is 2-5 minutes, and specifically, it can be washed at 95°C for 2 minutes. The drying is usually carried out in a drying manner, the drying temperature can be 80°C-100°C, and the drying time can be 1 minute-3 minutes; specifically, it can be dried at 80°C for 2 minutes.

[0041] Experiments show that the dry friction color fastness of the printed fabric obtained by the embodiment of the present invention is above level 4, the fabric surface has a high color yield, and the color is uniform. At the same time, the present invention shortens the process flow, improves production efficiency, saves energy and protects the environment, and is suitable for large-scale promotion and application.

[0042] The present invention is further described in detail below in conjunction with the examples. The examples described herein are only to help understand the present invention, and the embodiments of the present invention are not limited thereto. Among them, the materials, reagents and other raw materials used in the examples of the present invention, unless otherwise specified, can be obtained from commercial sources. In the following examples, the thickener used is DT-F, which is purchased from Shandong Yellow River Delta Textile Technology Research Institute Co., Ltd.

[0043] Example 1

[0044] (1) Prepare printing paste, the mass composition is as follows:

[0045] Thickener: 4%, urea: 10%, ammonium sulfate: 1%; water: 85%.

[0046] (2) Prepare 100 g of printing paste, the composition of which is as follows: take 55 g of the above printing paste, add 0.5 g of NHF-S blue, 2.5 g of NHF-S yellow, and 0.2 g of NHF-S red (purchased from DyStar) to the above printing paste, stir evenly, then add 1.5 g of vat blue CLF, 1.2 g of vat BR brown, and 4 g of vat F3GC yellow (purchased from Jiangsu Yabang Dyestuff Co., Ltd.) to 39 g of water, stir evenly, and then add to the paste to which the acid dye has been added to obtain a printing paste, the viscosity of the paste being 17000 mPa.s.

[0047] (3) After the printing paste is stirred evenly, the brocade / cotton blended fabric after the pre-printing treatment is printed, wherein the brocade / cotton blended fabric specification is brocade 50 / cotton 50 34 / 2x34 / 2 54x48 1 / 2 (hair effect 6cm after the pre-printing treatment, whiteness 79%, the same as the following embodiments), and then dried (110℃x3 minutes), steamed (102℃x20 minutes), flashed (132℃x25 seconds, sodium hydroxide 80g / L, hydrosulfite 90g / L), cold washed (20℃x1 minute), oxidized (20℃x28 seconds, hydrogen peroxide 2g / L, glacial acetic acid 7g / L), hot washed (95℃x2 minutes) and dried (80℃x2 minutes) to obtain the finished printed fabric. The K / S value and color fastness value of the printed fabric are tested, and the color appearance is compared. The results are shown in Table 1.

[0048] Example 2

[0049] (1) Prepare printing paste, the mass composition is as follows:

[0050] Thickener: 4%, urea: 10%, ammonium sulfate: 1%; water: 85%.

[0051] (2) Prepare 100 g of printing paste, the composition of which is as follows: take 55 g of the above printing paste, add 0.6 g of NHF-S blue, 3 g of NHF-S yellow, and 0.24 g of NHF-S red (purchased from DyStar) to the above printing paste, stir evenly, then add 1.8 g of vat blue CLF, 1.4 g of vat brown BR, and 4.8 g of vat yellow F3GC (purchased from Jiangsu Yabang Dyestuff Co., Ltd.) to 33 g of water, stir evenly, and then add to the paste to which the acid dye has been added to obtain a printing paste, the viscosity of the paste being 17000 mPa.s.

[0052] (3) After the printing paste is stirred evenly, the brocade / cotton blended fabric after the pre-printing treatment is printed, wherein the brocade / cotton blended fabric has a specification of brocade 50 / cotton 50 34 / 2x34 / 2 54x48 1 / 2, and then dried (110°C x 3 minutes), steamed (102°C x 20 minutes), flashed (132°C x 25 seconds, sodium hydroxide 80g / L, hydrosulfite 90g / L), cold washed (20°C x 1 minute), oxidized (20°C x 28 seconds, hydrogen peroxide 2g / L, glacial acetic acid 7g / L), hot washed (95°C x 2 minutes) and dried (80°C x 2 minutes) to obtain a printed fabric product. The K / S value and color fastness value of the printed fabric are tested, and the color appearance is compared. The results are shown in Table 1.

[0053] Example 3

[0054] (1) Prepare printing paste, the mass composition is as follows:

[0055] Thickener: 4%, urea: 10%, ammonium sulfate: 1%; water: 85%.

[0056] (2) Prepare 100 g of printing paste, the composition of which is as follows: take 55 g of the above printing paste, add 0.7 g of NHF-S blue, 3.5 g of NHF-S yellow, and 0.28 g of NHF-S red (purchased from DyStar) to the above printing paste, stir evenly, then add 2.1 g of vat blue CLF, 1.68 g of vat brown BR, and 5.6 g of vat yellow F3GC (purchased from Jiangsu Yabang Dyestuff Co., Ltd.) to 31 g of water, stir evenly, and then add to the paste to which the acid dye has been added to obtain a printing paste, the viscosity of the paste being 17000 mPa.s.

[0057] (3) After the printing paste is stirred evenly, the brocade / cotton blended fabric after the pre-printing treatment is printed, wherein the brocade / cotton blended fabric has a specification of brocade 50 / cotton 50 34 / 2x34 / 2 54x48 1 / 2, and then dried (110°C x 3 minutes), steamed (102°C x 20 minutes), flashed (132°C x 25 seconds, sodium hydroxide 80g / L, hydrosulfite 90g / L), cold washed (20°C x 1 minute), oxidized (20°C x 28 seconds, hydrogen peroxide 2g / L, glacial acetic acid 7g / L), hot washed (95°C x 2 minutes) and dried (80°C x 2 minutes) to obtain a printed fabric product. The K / S value and color fastness value of the printed fabric are tested, and the color appearance is compared. The results are shown in Table 1.

[0058] Comparative Example 1

[0059] (1) Prepare printing paste, the mass composition is as follows:

[0060] Thickener: 5%, urea: 10%, baking soda: 2.5%; water: 82.5%.

[0061] (2) Prepare 100 g of printing paste, the composition of which is as follows: take 55 g of the above printing paste, add 2.2 g of reactive blue P-3R, 3.3 g of reactive yellow P-6GS, and 0.5 g of reactive red P-6BL (purchased from Huntsman) to the above printing paste, then add 39 g of water, stir evenly to obtain the printing paste, the viscosity of the paste is 17000 mPa.s.

[0062] (3) After the printing paste is stirred evenly, the brocade / cotton blended fabric after the pre-printing treatment is printed, wherein the brocade / cotton blended fabric has a specification of brocade 50 / cotton 50 34 / 2x34 / 2 54x48 1 / 2, and then dried (110°C x 3 minutes), steamed (102°C x 20 minutes), cold washed (20°C x 1 minute), hot washed (95°C x 2 minutes) and dried (80°C x 2 minutes) to obtain a printed fabric product. The K / S value and color fastness value of the printed fabric are tested, and the color appearance is compared. The results are shown in Table 1.

[0063] Table 1 Comparison of test results of printing of brocade / cotton blended fabrics in the embodiments of the present invention

[0064]

[0065] The determination methods of the indicators in Table 1 are as follows:

[0066] Soap fastness is tested according to national standard GB / T3921-2008;

[0067] Dry and wet rubbing fastness shall be in accordance with GB / T3920-2008;

[0068] The color fastness to (alkali) perspiration shall be in accordance with GB / T3922-2008;

[0069] The color fastness to chlorine bleaching shall be carried out in accordance with ISO105E03:2010.

[0070] It can be seen from the above embodiments that the brocade / cotton fabric in the embodiment of the present invention uses the acid / thorium same pulp printing process, which has relatively better color fastness and fullness than the active process, and the printing outline is clearer; according to the color measurement data of the printing color samples prepared by the flash evaporation process compared with the conventional evaporation process, it can also be directly seen that the color sample depth of the flash evaporation process is significantly improved.

[0071] Finally, it should be noted that the specific embodiments described in this article are merely examples of the spirit of the present invention, and are not intended to limit the implementation methods of the present invention. Those skilled in the art of the present invention may make other modifications or additions to the described embodiments and replace them in a similar manner. It is not necessary and impossible to provide all the implementation methods here. These obvious changes or modifications derived from the essential spirit of the present invention still fall within the scope of protection of the present invention, and interpreting them as any additional limitation is contrary to the spirit of the present invention.

Claims

1. A printing method for brocade / cotton blended fabric, characterized in that: The following steps are involved: S1. performing pre-printing treatment on the grey cloth, wherein the grey cloth is a brocade / cotton blended fabric; S2, printing the brocade / cotton blended fabric that has undergone the printing pre-treatment to obtain a printed fabric; The printing adopts acid / Shilin printing paste, which includes acid dye, Shilin dye, thickener, urea, ammonium sulfate and water; the mass percentage of nylon in the nylon / cotton blended fabric is 10% to 80%; The printing process includes printing, drying, evaporation, flash evaporation and oxidation in sequence. The temperature of the flash evaporation is higher than the temperature of the evaporation, and the time of the flash evaporation is shorter than the time of the evaporation.

2. The printing method according to claim 1, characterized in that: The pre-printing treatment in step S1 includes seam turning, singeing, desizing, shaping, mercerizing and weft straightening of the grey cloth.

3. The printing method according to claim 1, characterized in that: In step S2, the printing paste composition per 100 parts by mass is as follows: 1-8 parts of acid dye, 1-8 parts of Shilin dye, 2-5 parts of thickener, 5-10 parts of urea, 0.5-1.5 parts of ammonium sulfate and the balance of water; the thickener is a polyhydroxy high molecular polymer.

4. The printing method according to any one of claims 1 to 3, characterized in that: In step S2, the drying temperature is 100°C to 140°C, and the drying time is 2 minutes to 4 minutes.

5. The printing method according to claim 4, characterized in that: In step S2, the evaporation is performed using saturated steam at a temperature of 100°C to 105°C, and the evaporation time is 15 minutes to 30 minutes.

6. The printing method according to claim 5, characterized in that: In step S2, the flash evaporation temperature is 130°C to 139°C, and the flash evaporation time is 20 seconds to 40 seconds.

7. The printing method according to claim 6, characterized in that: In step S2, the flash evaporation process includes applying a reducing solution, wherein the reducing solution includes sodium hydroxide and hydrosulfite, wherein the concentration of sodium hydroxide is 80-100 g / L, and the concentration of hydrosulfite is 80-110 g / L.

8. The printing method according to claim 7, characterized in that: In step S2, the materials involved in the oxidation include hydrogen peroxide and glacial acetic acid, the oxidation temperature is 10° C. to 35° C., and the oxidation time is 20 seconds to 40 seconds.

9. The printing method according to any one of claims 1 to 3, characterized in that: The printing process also includes washing and drying to obtain a finished printed fabric.

10. The printing method according to any one of claims 1 to 3, characterized in that: The dry rubbing color fastness of the printed fabric is above grade 4.

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