Printed fabric with low sulfide content and preparation method thereof
By combining low-concentration DCCNa solution with specific process steps, the problem of sulfide residue in printed fabrics was solved, achieving safe and environmentally friendly desulfurization while maintaining fabric quality.
Patent Information
- Application Number
- CN202411602575.0
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2024-11-11
- Publication Date
- 2025-01-10
AI Technical Summary
The residual sulfides and sulfur chloride produced during the reduction and color development process of existing printed fabrics affect human health and the production environment, and it is difficult to maintain the color and quality of the fabric during the desulfurization process.
The printed fabric is desulfurized using a low-concentration DCCNa solution, combined with specific process steps such as cold pad-batch, scouring and bleaching, mercerizing, setting, dyeing, printing, baking and color development, reduction and color development soaping and finishing. The concentration of DCCNa solution is controlled at 3~6g/L, and sulfides are removed by multiple water washes.
It effectively removes sulfides from printed fabrics, reduces their content, ensures that the fabric color is not damaged, maintains good mechanical properties and appearance, and protects human health and the environment.
Smart Images
Figure CN119287686A_ABST
Abstract
Description
Technical Field
[0001] The invention belongs to the technical field of fabric printing and dyeing, and particularly relates to a printed fabric with low sulfide content and a preparation method thereof. Background Art
[0002] Vat dyes are insoluble in water and cannot be used for direct dyeing. They need to be reduced to leuco dyes in a strong alkaline reducing solution of caustic soda and sodium hydrosulfite. The leuco dyes are used to dye cotton fibers. After oxidation, they are converted back to insoluble dyes and fixed to the fibers. Suspension padding is carried out on continuous padding equipment. The dyes are not reduced but prepared into a dispersion liquid suspended with fine particles. The fabrics are then padded, dried, and further padded with an alkaline reducing solution containing sodium hydrosulfite. The fabrics are then placed in a closed steamer to promote the reduction, dissolution, diffusion, and penetration of the dyes. Finally, the dyes are oxidized and soaped.
[0003] Among them, the indispensable insurance powder, whose chemical name is sodium dithionite, is easy to produce sulfides and sulfur chlorides during the reduction and color development process, which remain in the textiles; the fabrics are made into clothing, and people will cause certain harm to the human body in the process of wearing them over time. At the same time, after the insurance powder decomposes, it will produce irritating SO2 gas, which seriously affects the production environment and personal health. However, the key position of insurance powder in the reduction and color development process is irreplaceable, so it is imperative to remove sulfides from textiles. However, in the process of desulfurization, if the dosage and operation method of DCCNa are not well controlled, it is easy to destroy the appearance color of the textiles and affect the quality of the fabrics. Summary of the invention
[0004] In view of the above-mentioned prior art, the present invention provides a printed fabric with low sulfide content and a preparation method thereof, so as to solve the technical problem that the sulfide content of the existing printed fabric is too high.
[0005] In order to achieve the above object, the technical solution adopted by the present invention is to provide a method for preparing a printed fabric with a low sulfide content, comprising the following steps: S1: The grey cloth is subjected to cloth turning, cold padding, scouring, mercerizing and shaping treatment in sequence to obtain a shaped fabric; S2: padding the shaped fabric with the dyeing base liquid to obtain the dyeing base fabric; the vehicle speed during the padding process is 40-50 m / min, and the liquid carrying rate is 55-65%; the dyeing base liquid includes the following components in parts by weight: 40 parts of vat dye, 1-5 parts of anti-back-bleeding agent, 3-7 parts of fastness enhancer and 60 parts of deionized water; S3: Printing a printing paste on the dyed fabric at a speed of 40-50 m / min to obtain a printed fabric; the printing paste comprises the following components in parts by weight: 40 parts of a vat dye, 3-5 parts of a fastness enhancer, 1-4 parts of a sodium alginate paste, and 60 parts of deionized water; S4: baking the printed fabric to develop color, thereby obtaining a colored fabric; S5: Place the dyed fabric in a reducing solution, steam at 100-130°C for 10-20s; then wash with cold water for 75s; then oxidize in an oxidizing solution for 25s; then wash with a soaping solution for 75s; then wash with cold water for 75s; then wash with a neutralizing solution for 25s, then wash with cold water for 25s, squeeze and dry to obtain a soaped fabric; the reducing solution includes the following components in concentrations: caustic soda 800g / L, sodium dithionite 80g / L and starch 15g / L; the oxidizing solution is a hydrogen peroxide solution with a concentration of 3g / L; the soaping solution is a soaping agent solution with a concentration of 3g / L, and soaping is performed at a temperature of 95°C; the neutralizing solution is a pH neutralizer solution with a concentration of 3g / L; S6: Finish the fabric after soaping, then put the finished fabric into a washing tank filled with DCCNa solution and wash it for 20-30 seconds, then wash it with clean water at room temperature for 50 seconds, and then wash it with clean water at 30-40°C for 100 seconds.
[0006] Based on the above technical solution, the present invention can also be improved as follows.
[0007] Furthermore, the cold pad-batch treatment process is as follows: immersing the turned fabric in a treatment solution, rolling it 2 to 5 times, and then stacking it at 35 to 40°C for 8 to 12 hours; the treatment solution used includes the following concentrations of components: Caustic soda 18~22g / L, refining agent 0.5g~2 / L, hydrogen peroxide 4~5g / L, water glass 4~5g / L, chelating agent 1~3g / L and quick-working agent 1~3g / L.
[0008] Furthermore, the scouring and bleaching treatment is to dip and roll the cold-rolled fabric into the scouring and bleaching working solution in a double-immersion and double-rolling manner, and then steam at 65-75°C for 30-45 minutes to obtain the scouring and bleaching fabric; during the dipping and rolling process of the scouring and bleaching working solution, the vehicle speed is 60-70m / min, and the liquid carrying rate is 75-85%; the scouring and bleaching working solution includes the following components in the following concentrations: caustic soda 6-10g / L, refining agent 1-5g / L, quick scouring agent 1-3g / L, and hydrogen peroxide 10-15g / L.
[0009] Furthermore, the refining agent is sodium dodecylbenzene sulfonate, and the quick-working agent is sodium stearate.
[0010] Furthermore, the mercerizing treatment is to immerse the scouring and bleaching fabric in a caustic soda solution with a concentration of 220-280 g / L and a temperature of 90-120°C at a speed of 80-100 m / min, then rinse and wash five times at 80°C to remove the alkali, and then rinse with 90°C water until the pH value of the fabric surface reaches 7.0.
[0011] Furthermore, the speed of the shaping process is 100-120 m / min, and the shaping temperature is 200-230°C.
[0012] Furthermore, the vat dye is at least one of vat light yellow F-3G, vat golden yellow RK, vat red FBB, vat red 6B, vat brilliant red LGG, vat pink R, vat brilliant orange GR, vat green FFB, vat dark blue NBS, vat brown BR, vat brown RN, vat blue CLF, vat blue 5508, vat black GM and vat black BCN.
[0013] Furthermore, the color baking in S4 is to bake the printed fabric at 200-210° C. at a speed of 45 m / min for 100-120 s.
[0014] Furthermore, the concentration of the DCCNa solution is 3-6 g / L.
[0015] The invention also discloses a printed fabric with low sulfide content prepared by the preparation method.
[0016] The beneficial effects of the present invention are: 1. The present invention utilizes DCCNa solution to carry out desulfurization treatment on printed fabrics, which can effectively remove sulfides and the like generated during the reduction color development process, thereby reducing the content of sulfides in the fabrics and will not have adverse effects on human health.
[0017] 2. The present invention controls the concentration of the DCCNa solution to 3-6 g / L, thereby removing sulfides from the fabric and ensuring that the color of the printed fabric is not destroyed, so that the printed fabric has a bright appearance.
[0018] 3. The preparation method of the present invention can ensure that the fabric has good mechanical properties and can effectively meet the needs of customers. BRIEF DESCRIPTION OF THE DRAWINGS
[0019] Figure 1 This is a diagram showing the desulfurization effect of the printed fabric obtained in the example. DETAILED DESCRIPTION
[0020] The specific implementation modes of the present invention are described in detail below with reference to the embodiments.
[0021] Example 1 A fabric printing desulfurization method comprises the following steps: (1) Turning over: Take the grey cloth with the specification of C50 / T50 21*21 92*56 63″2 / 2 grid and turn it over; (2) Cold padding: Immerse the turned fabric in the treatment solution, roll it three times, and then pile it at 38°C for 10 hours; the treatment solution used includes the following concentrations of components: Caustic soda 20g / L, refining agent (sodium dodecylbenzene sulfonate) 1g / L, hydrogen peroxide 5g / L, water glass 5g / L, chelating agent (ethylenediaminetetraacetic acid) 2g / L and quick-working agent (sodium stearate) 1g / L; (3) Scouring and bleaching: The cold-rolled fabric is dipped into the scouring and bleaching solution by two-dipping and two-rolling method, and then steamed at 70°C for 30 minutes to obtain the scouring and bleaching fabric; during the dipping and rolling process of the scouring and bleaching solution, the vehicle speed is 65m / min, and the liquid carrying rate is 80%; the scouring and bleaching solution used includes the following components: caustic soda 8g / L, refining agent (same as above) 2g / L, quick scouring agent (same as above) 2g / L, hydrogen peroxide 14g / L; (4) Mercerization: The scouring and bleaching fabric is dipped into a caustic soda solution with a concentration of 200 g / L and a temperature of 100°C at a speed of 90 m / min, then rinsed and washed five times at 80°C to remove the alkali, and then rinsed with water at 90°C until the pH value of the fabric surface is 7.0, thereby obtaining a mercerized fabric; (5) Shaping: The mercerized fabric is shaped at 210°C at a speed of 110 m / min, and rolled to make it wrinkle-free, thereby obtaining a shaped fabric; (6) Dyeing: The mercerized fabric is dipped into the dyeing solution to obtain the dyeing fabric. The speed of the machine during the padding process is 45 m / min and the liquid carrying rate is 60%. The dyeing solution comprises the following components by weight: 40 parts of vat black GM, 2 parts of anti-back penetration agent (sodium silicate), 5 parts of fastness enhancer (polymer of dimethylamine and epichlorohydrin, CAS: 25988-97-0) and 60 parts of deionized water; (7) Printing: Printing a printing paste on the dyed base fabric at a speed of 45 m / min to obtain a printed fabric; the printing paste comprises the following components in parts by weight: 40 parts of vat black GM, 4 parts of a fastness enhancer (same as above), 2 parts of a sodium alginate paste and 60 parts of deionized water; (8) Baking for color development: Baking the printed fabric at 210°C at a speed of 45 m / min for 100 s to obtain a colored fabric; (9) Reduction color soap washing: the color developing fabric is placed in a reducing solution, steamed at 120°C for 12 seconds; then washed with cold water for 75 seconds; then oxidized in an oxidizing solution for 25 seconds; then washed with a soaping solution for 75 seconds; then washed with cold water for 75 seconds; then washed with a neutralizing solution for 25 seconds, then washed with cold water for 25 seconds, squeezed and dried to obtain a soaped fabric; the reducing solution includes the following components in concentrations: caustic soda 800 g / L, sodium dithionite 80 g / L and starch 15 g / L; the oxidizing solution is hydrogen peroxide with a concentration of 3 g / L; the soaping solution is a soaping agent solution with a concentration of 3 g / L, and the soaping is carried out at a temperature of 95°C; the neutralizing solution is a pH neutralizer solution with a concentration of 3 g / L; (10) Post-finishing: the soap-washed fabric is dipped into a mosquito-repellent finishing liquid, and then dried to obtain the finished fabric, wherein the liquid carrying rate during the dipping process is 60%, and the drying temperature is 135° C.; the mosquito-repellent finishing liquid comprises a mosquito repellent SPA-01 with a concentration of 120 g / L and a polyacrylate with a concentration of 50 g / L; (11) Desulfurization finishing: DCCNa was prepared into a solution with a concentration of 4 g / L and loaded into the No. 1 washing tank. The finished fabric was washed in the No. 1 washing tank for 25 seconds. The washed fabric was then passed through the No. 2 washing tank and the No. 3 washing tank filled with clean water at room temperature for 50 seconds. The fabric was then passed through the No. 4 washing tank, the No. 5 washing tank, the No. 6 washing tank and the No. 7 washing tank filled with clean water at a temperature of 35°C for a total of 100 seconds. The fabric was then dried to obtain a desulfurized printed fabric.
[0022] Example 2 A fabric printing desulfurization method comprises the following steps: (1) Turning over: Take the grey cloth with the specification of C50 / T50 21*21 92*56 63″2 / 2 grid and turn it over; (2) Cold padding: Immerse the turned fabric in the treatment solution, roll it three times, and then pile it at 35°C for 12 hours; the treatment solution used includes the following concentrations of components: Caustic soda 18g / L, refining agent (sodium dodecylbenzene sulfonate) 2g / L, hydrogen peroxide 4g / L, water glass 6g / L, chelating agent (ethylenediaminetetraacetic acid) 1g / L and quick-working agent (sodium stearate) 3g / L; (3) Scouring and bleaching: The cold-rolled fabric is dipped into the scouring and bleaching solution by two-dipping and two-rolling method, and then steamed at 65°C for 45 minutes to obtain the scouring and bleaching fabric; during the dipping and rolling process of the scouring and bleaching solution, the vehicle speed is 65m / min, and the liquid carrying rate is 80%; the scouring and bleaching solution used includes the following components: 6g / L caustic soda, 5g / L refining agent (same as above), 1g / L quick scouring agent (same as above), and 10g / L hydrogen peroxide; (4) Mercerization: The scouring and bleaching fabric is dipped into a caustic soda solution with a concentration of 180 g / L and a temperature of 120°C at a speed of 90 m / min, then rinsed and washed five times at 80°C to remove the alkali, and then rinsed with water at 90°C until the pH value of the fabric surface is 7.0, thereby obtaining a mercerized fabric; (5) Shaping: The mercerized fabric is shaped at 200°C at a speed of 110 m / min, and rolled to make it wrinkle-free, thereby obtaining a shaped fabric; (6) Dyeing: The mercerized fabric is dipped into the dyeing solution to obtain the dyeing fabric. The speed of the machine during the padding process is 45 m / min and the liquid carrying rate is 60%. The dyeing solution comprises the following components by weight: 40 parts of vat green FFB, 5 parts of anti-back penetration agent (sodium silicate), 3 parts of fastness enhancer (polymer of dimethylamine and epichlorohydrin, CAS: 25988-97-0) and 60 parts of deionized water; (7) Printing: Printing a printing paste on the dyed base fabric at a speed of 45 m / min to obtain a printed fabric; the printing paste comprises the following components in parts by weight: 40 parts of vat green FFB, 3 parts of a fastness enhancer (same as above), 4 parts of a sodium alginate paste, and 60 parts of deionized water; (8) Baking for color development: baking the printed fabric at 200°C at a speed of 45 m / min for 120 s to obtain a colored fabric; (9) Reduction color soap washing: the color developing fabric is placed in a reducing solution, steamed at 100°C for 20 seconds; then washed with cold water for 75 seconds; then oxidized in an oxidizing solution for 30 seconds; then washed with a soaping solution for 75 seconds; then washed with cold water for 75 seconds; then washed with a neutralizing solution for 25 seconds, then washed with cold water for 25 seconds, squeezed and dried to obtain the soaped fabric; the reducing solution includes the following components in concentrations: 750 g / L caustic soda, 90 g / L sodium dithionite and 10 g / L starch; the oxidizing solution is a hydrogen peroxide solution with a concentration of 3 g / L; the soaping solution is a soaping agent solution with a concentration of 3 g / L, and the soaping is carried out at a temperature of 95°C; the neutralizing solution is a pH neutralizer solution with a concentration of 3 g / L; (10) Post-finishing: the soap-washed fabric is dipped into a mosquito-repellent finishing liquid, and then dried to obtain the finished fabric, wherein the liquid carrying rate during the dipping process is 60%, and the drying temperature is 135° C.; the mosquito-repellent finishing liquid comprises a mosquito repellent SPA-01 with a concentration of 120 g / L and a polyacrylate with a concentration of 50 g / L; (11) Desulfurization finishing: DCCNa was prepared into a solution with a concentration of 3 g / L and loaded into the No. 1 washing tank. The finished fabric was washed in the No. 1 washing tank for 30 seconds. The washed fabric was then passed through the No. 2 washing tank and the No. 3 washing tank filled with clean water at room temperature for 50 seconds. The fabric was then passed through the No. 4 washing tank, the No. 5 washing tank, the No. 6 washing tank and the No. 7 washing tank filled with clean water at a temperature of 35°C for a total of 100 seconds. The fabric was then dried to obtain a desulfurized printed fabric.
[0023] Example 3 A fabric printing desulfurization method comprises the following steps: (1) Turning over: Take the grey cloth with the specification of C50 / T50 21*21 92*56 63″2 / 2 grid and turn it over; (2) Cold padding: Immerse the turned fabric in the treatment solution, roll it three times, and then pile it at 40°C for 8 hours; the treatment solution used includes the following concentrations of components: Caustic soda 22g / L, refining agent (sodium dodecylbenzene sulfonate) 0.5g / L, hydrogen peroxide 6g / L, water glass 4g / L, chelating agent (ethylenediaminetetraacetic acid) 3g / L and quick-working agent (sodium stearate) 2g / L; (3) Scouring and bleaching: The cold-rolled fabric is dipped into the scouring and bleaching solution by two-dipping and two-rolling method, and then steamed at 75°C for 30 minutes to obtain the scouring and bleaching fabric; during the scouring and bleaching solution, the vehicle speed is 65m / min and the liquid carrying rate is 80%; the scouring and bleaching solution used includes the following components: caustic soda 10g / L, refining agent (same as above) 1g / L, quick scouring agent (same as above) 3g / L, hydrogen peroxide 15g / L; (4) Mercerization: The scouring and bleaching fabric is dipped into a caustic soda solution with a concentration of 220 g / L and a temperature of 90°C at a speed of 90 m / min, then rinsed and washed five times at 80°C to remove the alkali, and then rinsed with water at 90°C until the pH value of the fabric surface is 7.0, thereby obtaining a mercerized fabric; (5) Shaping: The mercerized fabric is shaped at 230°C at a speed of 110 m / min, and rolled to remove wrinkles, thereby obtaining a shaped fabric; (6) Dyeing: padding the mercerized fabric with dyeing solution to obtain dyeing fabric. The speed of the machine during padding is 45 m / min and the liquid carrying rate is 60%. The dyeing solution comprises the following components by weight: 40 parts of vat blue CLF, 1 part of anti-back-bleeding agent (sodium silicate), 7 parts of fastness enhancer (polymer of dimethylamine and epichlorohydrin, CAS: 25988-97-0) and 60 parts of deionized water. (7) Printing: Printing a printing paste on the dyed base fabric at a speed of 45 m / min to obtain a printed fabric; the printing paste comprises the following components in parts by weight: 40 parts of vat blue CLF, 5 parts of a fastness enhancer (same as above), 1 part of a sodium alginate paste, and 60 parts of deionized water; (8) Baking for color development: Baking the printed fabric at 210°C at a speed of 45 m / min for 100 s to obtain a colored fabric; (9) Reduction color soap washing: the color developing fabric is placed in a reducing solution, steamed at 130°C for 10 seconds; then washed with cold water for 75 seconds; then oxidized in an oxidizing solution for 20 seconds; then washed with a soaping solution for 75 seconds; then washed with cold water for 75 seconds; then washed with a neutralizing solution for 25 seconds, then washed with cold water for 25 seconds, squeezed and dried to obtain a soaped fabric; the reducing solution includes the following components in concentrations: 850 g / L caustic soda, 70 g / L sodium dithionite and 20 g / L starch; the oxidizing solution is a hydrogen peroxide solution with a concentration of 3 g / L; the soaping solution is a soaping agent solution with a concentration of 3 g / L, and the soaping is carried out at a temperature of 95°C; the neutralizing solution is a pH neutralizer solution with a concentration of 3 g / L; (10) Post-finishing: the soap-washed fabric is dipped into a mosquito-repellent finishing liquid, and then dried to obtain the finished fabric, wherein the liquid carrying rate during the dipping process is 60%, and the drying temperature is 135° C.; the mosquito-repellent finishing liquid comprises a mosquito repellent SPA-01 with a concentration of 120 g / L and a polyacrylate with a concentration of 50 g / L; (11) Desulfurization finishing: DCCNa was prepared into a solution with a concentration of 6 g / L and loaded into the No. 1 washing tank. The finished fabric was washed in the No. 1 washing tank for 20 seconds. The washed fabric was then passed through the No. 2 washing tank and the No. 3 washing tank filled with clean water at room temperature for 50 seconds. The fabric was then passed through the No. 4 washing tank, the No. 5 washing tank, the No. 6 washing tank and the No. 7 washing tank filled with clean water at a temperature of 35°C for a total of 100 seconds. The fabric was then dried to obtain a desulfurized printed fabric.
[0024] Example 4 A fabric printing desulfurization method comprises the following steps: (1) Turning over: Take the grey cloth with the specification of C50 / T50 21*21 92*56 63″2 / 2 grid and turn it over; (2) Cold padding: Immerse the turned fabric in the treatment solution, roll it three times, and then pile it at 40°C for 8 hours; the treatment solution used includes the following concentrations of components: Caustic soda 22g / L, refining agent (sodium dodecylbenzene sulfonate) 0.5g / L, hydrogen peroxide 6g / L, water glass 4g / L, chelating agent (ethylenediaminetetraacetic acid) 3g / L and quick-working agent (sodium stearate) 2g / L; (3) Scouring and bleaching: The cold-rolled fabric is dipped into the scouring and bleaching solution by two-dipping and two-rolling method, and then steamed at 75°C for 30 minutes to obtain the scouring and bleaching fabric; during the scouring and bleaching solution, the vehicle speed is 65m / min and the liquid carrying rate is 80%; the scouring and bleaching solution used includes the following components: caustic soda 10g / L, refining agent (same as above) 1g / L, quick scouring agent (same as above) 3g / L, hydrogen peroxide 15g / L; (4) Mercerization: The scouring and bleaching fabric is dipped into a caustic soda solution with a concentration of 220 g / L and a temperature of 90°C at a speed of 90 m / min, then rinsed and washed five times at 80°C to remove the alkali, and then rinsed with water at 90°C until the pH value of the fabric surface is 7.0, thereby obtaining a mercerized fabric; (5) Shaping: The mercerized fabric is shaped at 230°C at a speed of 110 m / min, and rolled to make it wrinkle-free, thereby obtaining a shaped fabric; (6) Dyeing: Paddling the mercerized fabric with dyeing solution to obtain dyeing fabric. The speed of the machine during the padding process is 45 m / min and the liquid carrying rate is 60%. The dyeing solution comprises the following components by weight: 40 parts of reduced brown BR, 1 part of anti-back penetration agent (sodium silicate), 7 parts of fastness enhancer (polymer of dimethylamine and epichlorohydrin, CAS: 25988-97-0) and 60 parts of deionized water; (7) Printing: Printing a printing paste on the dyed base fabric at a speed of 45 m / min to obtain a printed fabric; the printing paste comprises the following components in parts by weight: 40 parts of vat brown BR, 5 parts of a fastness enhancer (same as above), 1 part of a sodium alginate paste, and 60 parts of deionized water; (8) Baking for color development: Baking the printed fabric at 210°C at a speed of 45 m / min for 100 s to obtain a colored fabric; (9) Reduction color soap washing: the color developing fabric is placed in a reducing solution, steamed at 130°C for 10 seconds; then washed with cold water for 75 seconds; then oxidized in an oxidizing solution for 20 seconds; then washed with a soaping solution for 75 seconds; then washed with cold water for 75 seconds; then washed with a neutralizing solution for 25 seconds, then washed with cold water for 25 seconds, squeezed and dried to obtain a soaped fabric; the reducing solution includes the following components in concentrations: 850 g / L caustic soda, 70 g / L sodium dithionite and 20 g / L starch; the oxidizing solution is a hydrogen peroxide solution with a concentration of 3 g / L; the soaping solution is a soaping agent solution with a concentration of 3 g / L, and the soaping is carried out at a temperature of 95°C; the neutralizing solution is a pH neutralizer solution with a concentration of 3 g / L; (10) Post-finishing: the soap-washed fabric is dipped into a mosquito-repellent finishing liquid, and then dried to obtain the finished fabric, wherein the liquid carrying rate during the dipping process is 60%, and the drying temperature is 135° C.; the mosquito-repellent finishing liquid comprises a mosquito repellent SPA-01 with a concentration of 120 g / L and a polyacrylate with a concentration of 50 g / L; (11) Desulfurization finishing: DCCNa was prepared into a solution with a concentration of 6 g / L and loaded into the No. 1 washing tank. The finished fabric was washed in the No. 1 washing tank for 20 seconds. The washed fabric was then passed through the No. 2 washing tank and the No. 3 washing tank filled with clean water at room temperature for 50 seconds. The fabric was then passed through the No. 4 washing tank, the No. 5 washing tank, the No. 6 washing tank and the No. 7 washing tank filled with clean water at a temperature of 35°C for a total of 100 seconds. The fabric was then dried to obtain a desulfurized printed fabric.
[0025] Results Analysis The desulfurization effect of the printed fabric obtained in the above embodiment was detected by intuitive detection, and the specific detection method is as follows: (1) Prepare the solution (acidic stannous chloride): dissolve 100 g of stannous chloride crystals in 100 ml of hydrochloric acid (35% concentration) and add 50 ml of distilled water; (2) Prepare about 1.5 g of finished cloth and cut it into small pieces for testing; place the sample in a test tube of appropriate size and cover it with stannous chloride solution; place a filter paper moistened with a drop of lead acetate solution (obtained by dissolving 5 g of reagent grade lead acetate in 100 ml of distilled water; add a drop of glacial acetic acid; if the solution is turbid, clear it with acetic acid) at the mouth of the test tube and make a pinhole on the filter paper; (3) Slowly heat the test tube over low heat until the solution boils (do not boil for more than 15 seconds, as prolonged boiling will reduce the sensitivity of the test); brown to black stains appear on the paper, indicating the presence of sulfides; this method can intuitively and clearly detect the effect of desulfurization.
[0026] The test results of the finished fabrics before and after desulfurization finishing in Examples 1 to 4 are as follows: Figure 1 As shown. Figure 1 It can be seen that the process of the present invention can effectively remove sulfides in printed fabrics and reduce the content of sulfides in the fabrics.
[0027] The mechanical properties of the printed fabric obtained in the above embodiment were tested, and the results are shown in Table 1.
[0028] Table 1 Mechanical properties of fabrics
[0029] It can be seen from Table 1 that the fabric obtained by the preparation method of the present invention has excellent mechanical properties and can meet the needs of customers.
[0030] Although the specific implementation of the present invention is described in detail in conjunction with the embodiments, it should not be understood as limiting the scope of protection of this patent. Within the scope described in the claims, various modifications and variations that can be made by those skilled in the art without creative work still fall within the scope of protection of this patent.
Claims
1. A method for preparing a printed fabric with low sulfide content, characterized in that: The following steps are involved: S1: The grey cloth is subjected to cloth turning, cold padding, scouring, mercerizing and shaping treatment in sequence to obtain a shaped fabric; S2: padding the shaped fabric with the dyeing solution to obtain the dyed fabric; the vehicle speed during the padding process is 40-50 m / min, and the liquid carrying rate is 55-65%; the dyeing solution comprises the following components in parts by weight: 40 parts of vat dye, 1-5 parts of back-bleeding preventer, 3-7 parts of fastness enhancer and 60 parts of deionized water; S3: Printing a printing paste on the dyed fabric at a speed of 40-50 m / min to obtain a printed fabric; the printing paste comprises the following components in parts by weight: 40 parts of a vat dye, 3-5 parts of a fastness enhancer, 1-4 parts of a sodium alginate paste, and 60 parts of deionized water; S4: baking the printed fabric to develop color, thereby obtaining a colored fabric; S5: Place the dyed fabric in a reducing solution, steam it at 100-130℃ for 10-20s; then wash it with cold water for 75s; then oxidize it in an oxidizing solution for 25s; then wash it with soap solution for 75s; then wash it with cold water for 75s; Then, the fabric is washed with a neutralizing solution for 25 seconds, then washed with cold water for 25 seconds, squeezed and dried to obtain a fabric after soaping; the reducing solution includes the following components in concentrations: 800 g / L caustic soda, 80 g / L sodium dithionite and 15 g / L starch; the oxidizing solution is a hydrogen peroxide solution with a concentration of 3 g / L; the soaping solution is a soaping agent solution with a concentration of 3 g / L, and the soaping is performed at a temperature of 95°C; the neutralizing solution is a pH neutralizing agent solution with a concentration of 3 g / L; S6: Finish the fabric after soaping, then put the finished fabric into a washing tank filled with DCCNa solution and wash it for 20-30 seconds, then wash it with clean water at room temperature for 50 seconds, and then wash it with clean water at 30-40°C for 100 seconds.
2. The preparation method according to claim 1, characterized in that: The cold pad-batch treatment process is as follows: immersing the turned fabric in a treatment solution, rolling it 2-5 times, and then stacking it at 35-40° C. for 8-12 hours; the treatment solution used includes the following components in the following concentrations: Caustic soda 18~22g / L, refining agent 0.5g~2 / L, hydrogen peroxide 4~5g / L, water glass 4~5g / L, chelating agent 1~3g / L and quick-working agent 1~3g / L.
3. The preparation method according to claim 2, characterized in that: The scouring and bleaching treatment is to dip the cold-rolled fabric into the scouring and bleaching working solution in a double-dipping and double-rolling manner, and then steam at 65-75°C for 30-45 minutes to obtain the scouring and bleaching fabric; during the dipping and rolling process of the scouring and bleaching working solution, the vehicle speed is 60-70m / min, and the liquid carrying rate is 75-85%; the scouring and bleaching working solution includes the following components in the following concentrations: 6-10g / L caustic soda, 1-5g / L refining agent, 1-3g / L quick scouring agent, and 10-15g / L hydrogen peroxide.
4. The preparation method according to claim 2 or 3, characterized in that: The refining agent is sodium dodecylbenzene sulfonate, and the quick-working agent is sodium stearate.
5. The preparation method according to claim 1, characterized in that: The mercerizing treatment is to immerse the bleached fabric in a caustic soda solution with a concentration of 220-280 g / L and a temperature of 90-120° C. at a speed of 80-100 m / min, then rinse and wash five times at 80° C. to remove the alkali, and then rinse with 90° C. water until the pH value of the fabric surface is 7.
0.
6. The preparation method according to claim 1, characterized in that: The speed of the shaping treatment is 100-120 m / min, and the shaping temperature is 200-230°C.
7. The preparation method according to claim 1, characterized in that: The vat dye is at least one of vat light yellow F-3G, vat golden yellow RK, vat red FBB, vat red 6B, vat brilliant red LGG, vat pink R, vat brilliant orange GR, vat green FFB, vat dark blue NBS, vat brown BR, vat brown RN, vat blue CLF, vat blue 5508, vat black GM and vat black BCN.
8. The preparation method according to claim 1, characterized in that: The baking color development in S4 is to bake the printed fabric at 200-210°C at a speed of 45 m / min for 100-120 seconds.
9. The preparation method according to claim 1, characterized in that: The concentration of the DCCNa solution is 3-6 g / L.
10. A printed fabric with low sulfide content obtained by the preparation method according to any one of claims 1 to 9.