Short-process dyeing and finishing process of polyester-cotton school uniform fabric

Abstract

The application relates to the field of dyeing and finishing processes of textiles, and particularly discloses a short-process polyester-cotton school uniform fabric dyeing and finishing process which comprises the following steps: S1, knitted double-sided cloth is first subjected to enzyme treatment by adding enzymes and glacial acetic acid, without washing and liquid discharge, so as to obtain pretreated fabric; S2, dyeing auxiliaries and water are added to the pretreated fabric, acid is added to adjust the pH, then dyes are added to perform dyeing treatment, and after refining, dyed fabric is obtained; S3, the dyed fabric is subjected to reduction cleaning and cloth washing, and after drying, finished fabric is obtained; the process has the advantages of efficient treatment, high dyeing rate and good mechanical performance of the fabric.

Description

Technical Field

[0001] This application relates to the field of dyeing and finishing processes for textiles, and more specifically, to a short-process dyeing and finishing process for polyester-cotton school uniform fabrics. Background Technology

[0002] Polyester-cotton knitted double-sided fabric is one of the main school uniform fabrics. Polyester-cotton school uniform fabric requires high quality. The dyeing and finishing process of the original polyester-cotton double-sided fabric is long, consumes a lot of resources, and the quality is unstable.

[0003] Polyester-cotton knitted double-sided fabric, one side contains polyester and the other side is cotton. Some school uniform fabrics require single-dyed polyester. The cotton side is the color of cotton after pretreatment, and the polyester-cotton side is dyed polyester. Short cotton fibers should not be exposed on the polyester-cotton side. The general process is: after pretreatment oxygen bleaching, fiber enzyme de-hairing is performed, followed by polyester dyeing. The three-step, three-stage treatment extends the processing time and increases the processing efficiency.

[0004] Therefore, how to develop an efficient dyeing and finishing process that can shorten processing time and improve the efficiency of preparing filter cotton school uniform fabric is an urgent problem to be solved. Summary of the Invention

[0005] In order to develop an efficient dyeing and finishing process that can shorten processing time and improve the efficiency of preparing filter cotton school uniform fabric, this application provides a short-process dyeing and finishing process for polyester-cotton school uniform fabric.

[0006] This application provides a short-process dyeing and finishing process for polyester-cotton school uniform fabric, employing the following technical solution:

[0007] A short-process dyeing and finishing process for polyester-cotton school uniform fabric includes the following steps:

[0008] S1. First, add enzymes and glacial acetic acid to the knitted double-sided fabric for enzyme treatment. Do not wash the fabric or drain the liquid to obtain the pre-treated fabric.

[0009] S2. Add dyeing auxiliaries and water to the pretreated fabric, adjust the pH with acid, add dye for dyeing treatment, and after refining, obtain the dyed fabric.

[0010] S3. After the dyed fabric undergoes reduction washing, washing, and drying, the finished fabric is obtained.

[0011] By adopting the above technical solution, the knitted double-sided fabric has a structure of cotton fiber on one side and polyester fiber on the other. The knitted double-sided fabric is first enzymatically treated with enzymes and glacial acetic acid to remove the fuzz and fluff on the surface of the cotton fibers, making the fabric surface smoother and the texture clearer. Glacial acetic acid can also adjust the subsequent dyeing effect. The resulting pre-treated fabric is not washed and directly contacts the dyeing auxiliaries and dyes, which improves the efficiency of the dyeing and finishing process, shortens the processing time, and ensures the dyeing effect on the polyester on the knitted double-sided fabric. It is less likely to cause excessive loss of polyester strength due to excessive high-temperature dyeing time. Finally, after refining, reduction cleaning and other treatments, steps are saved, work efficiency is improved, and the quality of the finished fabric is guaranteed.

[0012] Preferably, the S1 enzyme is a neutral cellulase, and the enzyme treatment temperature is 50-55℃ for 45-60 min.

[0013] By adopting the above technical solution, neutral cellulase gradually hydrolyzes β-1,4 glycosidic bonds from the ends of cotton fiber molecular chains, removes the amorphous region on the surface of cotton fibers, reduces fiber crystallinity, and, by limiting the enzyme treatment temperature and time, can further remove the fuzz on the surface of knitted double-sided fabric, ensuring the soft touch of the fabric and guaranteeing the quality of the finished fabric.

[0014] Preferably, the pH of S2 is adjusted to 4-5 by adding acid, and the process takes 8-12 minutes.

[0015] By adopting the above technical solution, disperse dye particles can be kept in suspension under acidic conditions to prevent aggregation and avoid hydrolysis of polyester ester bonds, thus preventing fiber damage. At the same time, the dye can be diffused and fixed inside the fiber, ensuring the uniformity of dyeing.

[0016] Preferably, the specific steps of the S2 staining treatment are as follows: treat at 120-135℃ for 30-50 min, and then cool down to 72-80℃ at a cooling rate of 1.5-2℃ / min.

[0017] By adopting the above technical solution, the polyester fiber structure relaxes at high temperature, allowing disperse dye molecules to diffuse into the fiber interior and bind with the fiber through hydrogen bonds and van der Waals forces, ensuring that the dye fully penetrates and is fixed in the fiber, thus guaranteeing the dyeing rate and dyeing uniformity. Slow cooling can ensure the stability of the fiber molecular chain, reduce internal stress, control shrinkage, and ensure the quality of the finished fabric.

[0018] Preferably, the knitted double-sided fabric undergoes pretreatment, and the specific pretreatment steps are as follows:

[0019] The double-sided fabric to be treated is immersed in a polyethylene glycol composite solution, subjected to pressure treatment, and then removed. The temperature is then raised to 60-65℃ to complete the pretreatment, resulting in a knitted double-sided fabric.

[0020] By adopting the above technical solution, after the knitted double-sided fabric is soaked in polyethylene glycol composite solution, the penetration and wetting effect of polyethylene glycol composite solution allows it to migrate into the pores of polyester fibers. Then, by raising the temperature, the stability of the polyethylene glycol composite solution in the pores between polyester fibers is improved, increasing the hydroxyl content in the knitted double-sided fabric, improving the binding effect of dyes, and increasing the dyeing rate. Furthermore, the polyethylene glycol composite solution penetrating between cotton fibers can reduce fiber shrinkage problems that occur during high-temperature enzyme treatment and high-temperature dyeing of cotton fibers, ensuring the quality of the finished fabric.

[0021] Preferably, the polyethylene glycol composite liquid is composed of a polyethylene glycol aqueous solution, polycaprolactone-modified nanocellulose, and polymethyl methacrylate as the carrier, in a mass ratio of 20:1-3:1-3.

[0022] By adopting the above technical solution, the polyethylene glycol aqueous solution has good flow and permeability, which facilitates the penetration of polycaprolactone-modified nanocellulose and the carrier polymethyl methacrylate into the fiber gaps. Under subsequent heating to 60-65℃, polycaprolactone can be thermally melted and bonded between cotton fibers. Under enzyme treatment at 50-55℃, polycaprolactone does not melt, which can stabilize the connection of cotton fibers and minimize the shrinkage and molecular chain breakage of cotton fibers during enzyme treatment, thus ensuring the mechanical properties of cotton fibers in the finished fabric. The polymethyl methacrylate carrier has high flexibility and is dispersed between polyester fibers, which can resist the shrinkage problem of polyester fibers during high-temperature dyeing, thus ensuring the mechanical properties and quality of the finished fabric.

[0023] Preferably, the polycaprolactone-modified nanocellulose is prepared by the following method:

[0024] A cetearyl alcohol ethanol solution was uniformly sprayed onto nanocellulose, and then polycaprolactone was added. After mixing and stirring evenly, polycaprolactone-modified nanocellulose was obtained. The mass ratio of nanocellulose, cetearyl alcohol solution and polycaprolactone was 1:0.2-0.3:0.2-0.3.

[0025] By adopting the above technical solution, the surface of nanocellulose utilizes the viscosity of cetearyl alcohol ethanol solution to bond polycaprolactone. Polycaprolactone is insoluble in ethanol and water, so it is not easily affected by moisture during enzymatic hydrolysis, nor by cetearyl alcohol ethanol solution. Under enzymatic hydrolysis conditions of 50-55℃, it can achieve a good connection effect on the fiber filaments, without the problem of detachment from the fiber filaments. This ensures that the nanofiber filaments interspersed between the fiber filaments can be stably adhered between the fiber filaments. Nanocellulose not only has a porous structure, but also has a large specific surface area and a high content of hydroxyl groups. Combined with the hydroxyl groups in cetearyl alcohol, it can further combine with dye molecules, improving the dyeing rate and color fastness of polyester fibers on double-sided knitted fabrics.

[0026] Cetearyl alcohol has a melting point of approximately 50°C. During enzymatic hydrolysis at temperatures of 50-55°C, cetearyl alcohol readily melts and flows. The melted cetearyl alcohol exhibits good fluidity, facilitating migration and flow on the surface of nanocellulose. Furthermore, gradually cooling cetearyl alcohol provides excellent adhesion, further stabilizing the nanocellulose between the fibers. The nanocellulose within the cotton fibers, utilizing its toughness combined with the adhesive effects of cetearyl alcohol and polycaprolactone, resists the damage to the cotton fibers during enzymatic hydrolysis, ensuring the mechanical properties of the finished fabric. Simultaneously, the presence of cetearyl alcohol and polycaprolactone does not completely prevent the adsorption and connection between nanocellulose and cotton fibers, and the nanocellulose is also less susceptible to the effects of cellulase, guaranteeing the quality of the finished fabric.

[0027] Preferably, the carrier polymethyl methacrylate is prepared by the following method:

[0028] Hydrogenated rosin pentaerythritol ester solution was uniformly sprayed onto the surface of polymethyl methacrylate in two applications at a mass ratio of 1:1-2. After drying and dispersion, the finished product was obtained.

[0029] By adopting the above technical solution, the hydrogenated rosin pentaerythritol ester solution can be softened multiple times to achieve a bonding effect. First, the hydrogenated rosin pentaerythritol ester solution is bonded to the surface of polymethyl methacrylate. Then, at a dyeing temperature of 130℃, since the softening point of hydrogenated rosin pentaerythritol ester is around 100℃, the softened and sticky hydrogenated rosin pentaerythritol ester can be softened again to achieve a bonding effect, adhering the carrier polymethyl methacrylate to the pores between polyester fibers. Utilizing the bonding stability and high toughness of polymethyl methacrylate, combined with the connection effect of the common ester groups of polymethyl methacrylate and polyester fibers, the shrinkage resistance of polyester fibers during high-temperature dyeing is improved, thereby ensuring the structural stability and quality of the finished fabric.

[0030] The hydroxyl groups in hydrogenated rosin pentaerythritol ester and polycaprolactone-modified nanocellulose can further bind with dye molecules, thereby improving the dyeing rate. Hydrogenated rosin pentaerythritol ester and polycaprolactone are insoluble in water, as are cetearyl alcohol, thus improving the color fastness of the finished fabric to washing.

[0031] Preferably, the dye is a disperse dye with 1-1.4% owf.

[0032] By adopting the above technical solution, disperse dyes are specifically used for polyester. At a higher temperature, the dye molecules diffuse into the interior of the fiber to achieve dyeing, resulting in a higher dyeing rate and higher color fastness for the polyester fibers in the finished fabric.

[0033] Preferably, the dyeing auxiliaries include 2-3 g / L of leveling agent, 1-2 g / L of dispersant, 1-3 g / L of aminoboron nitride, and 1-2 g / L of hydroxyapatite microspheres.

[0034] By adopting the above technical solution, the combination of leveling agent and dispersant can improve the uniformity of disperse dyeing on polyester fibers.

[0035] The combination of aminoboron nitride and hydroxyapatite microspheres utilizes the layered structure on the surface of aminoboron nitride to adsorb disperse dyes, controlling the aggregation of disperse dyes and improving the dyeing rate and color fastness of polyester fibers. Combined with the large specific surface area and surface hydroxyl groups of hydroxyapatite microspheres, disperse dye molecules can be adsorbed, and its porous structure can promote the diffusion of disperse dyes into the interior of polyester fibers, thereby giving the finished fabric a better dyeing rate and color fastness.

[0036] The amino groups in the amino boron nitride and the hydroxyl groups in the hydroxyapatite microspheres can connect with the hydroxyl groups on the surface of polycaprolactone-modified nanocellulose and the surface of the carrier polymethyl methacrylate in the fiber pores. This not only promotes the penetration of dye molecules and improves the adhesion of dye molecules to the surface of the finished fabric, but also ensures the stability of polyester fibers during the dyeing process, making it less likely for the fibers to shrink due to high-temperature dyeing, thus ensuring the quality of the finished fabric.

[0037] In summary, this application has the following beneficial effects:

[0038] 1. Knitted double-sided fabric has a structure with cotton fibers on one side and polyester fibers on the other. The knitted double-sided fabric is first treated with enzymes and glacial acetic acid to remove the fuzz and fluff on the surface of the cotton fibers, making the fabric surface smoother and the texture clearer. Glacial acetic acid can also adjust the subsequent dyeing effect. The resulting pre-treated fabric is not washed and directly contacts the dyeing auxiliaries and dyes to dye the polyester fibers. This can shorten the processing time while ensuring the dyeing effect on the knitted double-sided fabric and the mechanical properties of the fabric, and is less likely to cause excessive strength loss. Finally, it undergoes refining, reduction cleaning and other treatments, saving steps, improving work efficiency and ensuring the quality of the finished fabric.

[0039] 2. The gaps between fibers in polyester-cotton school uniform fabric are generally 10-50μm. Therefore, polycaprolactone-modified nanocellulose and polymethyl methacrylate can migrate to the gaps between fibers with polyethylene glycol aqueous solution. This protects the cotton fibers from fiber chain breakage during enzyme treatment, which would affect strength. It also protects the polyester fibers from excessive shrinkage during high-temperature dyeing, ensuring the mechanical strength and quality of the finished fabric. Detailed Implementation

[0040] The present application will be further described in detail below with reference to the embodiments.

[0041] Of the following raw materials, polycaprolactone was purchased from Wuhan Lanabai Pharmaceutical Chemical Co., Ltd.; polymethyl methacrylate was purchased from Jiangsu Guli New Materials Co., Ltd.; and hydrogenated rosin pentaerythritol ester was purchased from Jiangsu Bosite Chemical Technology Co., Ltd.; all other raw materials were commercially available.

[0042] Preparation Example 1: The polyethylene glycol composite liquid was prepared by the following method:

[0043] 0.25 kg of cetearyl alcohol ethanol solution was uniformly sprayed onto 1 kg of nanocellulose, and then 0.25 kg of polycaprolactone was added. The average length of the nanocellulose was 500 nm and the average diameter was 10 nm. The mass fraction of the cetearyl alcohol ethanol solution was 5%, the mass fraction of the ethanol was 99%, and the average particle size of the polycaprolactone was 40 nm. After mixing and stirring evenly, polycaprolactone-modified nanocellulose with an average particle size of less than 800 nm was obtained.

[0044] 0.8 kg of hydrogenated rosin pentaerythritol ester solution was uniformly sprayed onto the surface of 1 kg of polymethyl methacrylate. The average particle size of polymethyl methacrylate was 100 nm. The hydrogenated rosin pentaerythritol ester solution was obtained by heating to 110 °C and softening. Then, 0.7 kg of hydrogenated rosin pentaerythritol ester solution was uniformly sprayed onto the surface. After drying and dispersion, the loaded polymethyl methacrylate was obtained with an average particle size of less than 300 nm.

[0045] 20 kg of polyethylene glycol aqueous solution was mixed with 2 kg of polycaprolactone-modified nanocellulose and 2 kg of polymethyl methacrylate as a carrier and stirred evenly to obtain a polyethylene glycol composite solution; the mass fraction of the polyethylene glycol aqueous solution was 2%, and the polyethylene glycol was polyethylene glycol 1000.

[0046] Preparation Example 2: The difference between this preparation example and Preparation Example 1 is that:

[0047] 0.3 kg of cetearyl alcohol ethanol solution was uniformly sprayed onto 1 kg of nanocellulose, and then 0.2 kg of polycaprolactone was added. The average length of the nanocellulose was 500 nm and the average diameter was 10 nm. The mass fraction of the cetearyl alcohol ethanol solution was 5%, the mass fraction of the ethanol was 99%, and the average particle size of the polycaprolactone was 40 nm. After mixing and stirring evenly, polycaprolactone-modified nanocellulose with an average particle size of less than 800 nm was obtained.

[0048] 0.5 kg of hydrogenated rosin pentaerythritol ester solution was uniformly sprayed onto the surface of 1 kg of polymethyl methacrylate. The average particle size of polymethyl methacrylate was 100 nm. The hydrogenated rosin pentaerythritol ester solution was obtained by heating to 110 °C and softening. Then, 0.5 kg of hydrogenated rosin pentaerythritol ester solution was uniformly sprayed onto the surface of 1 kg of polymethyl methacrylate. After drying and dispersion, the loaded polymethyl methacrylate was obtained with an average particle size of less than 300 nm.

[0049] 20 kg of polyethylene glycol aqueous solution was mixed with 1 kg of polycaprolactone-modified nanocellulose and 1 kg of polymethyl methacrylate as a carrier and stirred evenly to obtain a polyethylene glycol composite solution; the mass fraction of the polyethylene glycol aqueous solution was 2%, and the polyethylene glycol was polyethylene glycol 1000.

[0050] Preparation Example 3: The difference between this preparation example and Preparation Example 1 is that:

[0051] 0.2 kg of cetearyl alcohol ethanol solution was uniformly sprayed onto 1 kg of nanocellulose, and then 0.3 kg of polycaprolactone was added. The average length of the nanocellulose was 500 nm and the average diameter was 10 nm. The mass fraction of the cetearyl alcohol ethanol solution was 5%, the mass fraction of the ethanol was 99%, and the average particle size of the polycaprolactone was 40 nm. After mixing and stirring evenly, polycaprolactone-modified nanocellulose with an average particle size of less than 800 nm was obtained.

[0052] 1 kg of hydrogenated rosin pentaerythritol ester solution was uniformly sprayed onto the surface of 1 kg of polymethyl methacrylate. The average particle size of polymethyl methacrylate was 100 nm. The hydrogenated rosin pentaerythritol ester solution was obtained by heating to 110 °C and softening. Then, 1 kg of hydrogenated rosin pentaerythritol ester solution was uniformly sprayed onto the surface of 1 kg of polymethyl methacrylate. After drying and dispersion, the loaded polymethyl methacrylate was obtained with an average particle size of less than 300 nm.

[0053] 20 kg of polyethylene glycol aqueous solution was mixed with 3 kg of polycaprolactone-modified nanocellulose and 3 kg of polymethyl methacrylate as a carrier and stirred evenly to obtain a polyethylene glycol composite solution; the mass fraction of the polyethylene glycol aqueous solution was 2%, and the polyethylene glycol was polyethylene glycol 1000.

[0054] All of the following ingredients are commercially available.

[0055] Preparation Example 4: Boron aminonitride was prepared by the following method:

[0056] 0.4 kg of triethanolamine solution was uniformly sprayed onto the surface of 1 kg of nano boron nitride. The average particle size of the nano boron nitride was 100 nm. The triethanolamine solution was a 5% (w / w) aqueous solution of triethanolamine. After drying and dispersion, the finished product, amino boron nitride, was obtained with an average particle size of less than 200 nm. Example

[0057] The neutral cellulase in the following raw materials was purchased from Shandong Juxinlong Biotechnology Co., Ltd.; the other raw materials are all commercially available.

[0058] Example 1: A short-process dyeing and finishing process for polyester-cotton school uniform fabric:

[0059] S1. Lay the double-sided knitted fabric flat on the front of the machine, divide it into sections according to the dyeing tubes of the dyeing machine, seal the fabric ends, and leave a 15cm gap at the beginning of the double-sided fabric; feed the fabric according to the dyeing liquor ratio of 1:10, first add enzyme and glacial acetic acid for enzyme treatment. The enzyme is neutral cellulase, the amount of enzyme added is 1% of the fabric weight, the amount of glacial acetic acid added is 0.1% of the dye liquor mass, the mass fraction of glacial acetic acid is 99%, the temperature during enzyme treatment is 55℃, the time is 50min, do not wash the fabric or drain the liquor after treatment, and obtain the pretreated fabric.

[0060] S2. Add dyeing auxiliaries and water to the pretreated fabric. The dyeing agent consists of 2.5 g / L leveling agent and 1.5 g / L dispersant. The dispersant is sodium lignosulfonate. After adjusting the pH to 4.5 with acid, run for 10 minutes, then add dye. The dye is a 1.2% (owf) disperse dye. After the dye is added, continue running for 10 minutes, and then carry out the dyeing treatment. During the dyeing treatment, the temperature is raised to 130℃ for 40 minutes. Then, during the cooling process, the temperature is lowered to 75℃ at a rate of 2℃ / min and refined for 30 minutes to obtain the dyed fabric.

[0061] S3. Add 8g / L caustic soda and 3g / L EDTA to the dyed fabric, using water as the solvent, and treat at 60℃ for 40 minutes to complete the reduction cleaning. Then wash the fabric twice with water and dry it to obtain the finished fabric.

[0062] Example 2: The difference between this example and Example 1 is that:

[0063] S1. Immerse the double-sided fabric to be treated in the polyethylene glycol composite solution prepared in Preparation Example 1 at a liquor ratio of 1:8. Pressurize at 5 MPa for 10 min, remove the double-sided fabric, heat to 64℃ for 20 min, and then air dry to complete the treatment and obtain knitted double-sided fabric. Lay the knitted double-sided fabric flat on the dyeing machine head and cut it into pieces according to the dyeing tubes of the dyeing machine. Seal the fabric ends and leave a 15 cm gap at the beginning of the double-sided fabric. Feed the fabric according to the dyeing liquor ratio of 1:10. First, add enzyme and glacial acetic acid for enzyme treatment. The enzyme is neutral cellulase, and the amount of enzyme added is 1% of the fabric weight. The amount of glacial acetic acid added is 0.1% of the dye liquor mass, and the mass fraction of glacial acetic acid is 99%. The temperature during enzyme treatment is 55℃ and the time is 50 min. Do not wash the fabric or drain the liquid after treatment to obtain pre-treated fabric.

[0064] S2. Dyeing auxiliaries and water were added to the pretreated fabric. The dyeing agent consisted of 2.5 g / L leveling agent, 1.5 g / L dispersant, 2 g / L aminoboron nitride prepared in Preparation Example 4, and 1.5 g / L hydroxyapatite microspheres. The average length of the hydroxyapatite microspheres was 500 nm and the average diameter was 10 nm. The dispersant was sodium lignosulfonate. The pH was adjusted to 4.5 with acid and the mixture was run for 10 min. Dye was then added. The dye was a 1.2% (owf) disperse dye. After the dye was added, the mixture was run for another 10 min. Then, the dyeing process was carried out. During the dyeing process, the temperature was raised to 130 °C for 40 min. Then, during the cooling process, the temperature was lowered to 75 °C at a rate of 2 °C / min and refined for 30 min to obtain the dyed fabric.

[0065] S3. Add 8g / L caustic soda and 3g / L EDTA to the dyed fabric, using water as the solvent, and treat at 60℃ for 40 minutes to complete the reduction cleaning. Then wash the fabric twice with water and dry it to obtain the finished fabric.

[0066] Example 3: The difference between this example and Example 2 is that:

[0067] S1. Immerse the double-sided fabric to be treated in the polyethylene glycol composite solution prepared in Preparation Example 2 at a liquor ratio of 1:8. Pressurize at 5 MPa for 10 min, remove the double-sided fabric, heat to 60℃ for 20 min, and then air dry to complete the treatment and obtain knitted double-sided fabric. Lay the knitted double-sided fabric flat on the dyeing machine head and cut it into pieces according to the dyeing tubes of the dyeing machine. Seal the fabric ends and leave a 15 cm gap at the beginning of the double-sided fabric. Feed the fabric according to the dyeing liquor ratio of 1:10. First, add enzyme and glacial acetic acid for enzyme treatment. The enzyme is neutral cellulase, and the amount of enzyme added is 1% of the fabric weight. The amount of glacial acetic acid added is 0.1% of the dye liquor mass, and the mass fraction of glacial acetic acid is 99%. The temperature during enzyme treatment is 50℃ and the time is 60 min. Do not wash the fabric or drain the liquid after treatment to obtain pre-treated fabric.

[0068] S2. Add dyeing auxiliaries and water to the pretreated fabric. The dyeing agent consists of 2 g / L dye, 1 g / L dispersant, 1 g / L aminoboron nitride prepared in Preparation Example 4, and 1 g / L hydroxyapatite microspheres. The average length of the hydroxyapatite microspheres is 500 nm and the average diameter is 10 nm. The dispersant is sodium lignosulfonate. Adjust the pH to 4 with acid and run for 12 min. Add the dye, which is a 1% (owf) disperse dye. After the dye is added, continue running for 10 min and then perform the dyeing treatment. During the dyeing treatment, the temperature is raised to 120℃ for 50 min. Then, during the cooling process, the temperature is lowered to 72℃ at a rate of 1.5℃ / min and refined for 30 min to obtain the dyed fabric.

[0069] S3. Add 8g / L caustic soda and 3g / L EDTA to the dyed fabric, using water as the solvent, and treat at 60℃ for 40 minutes to complete the reduction cleaning. Then wash the fabric twice with water and dry it to obtain the finished fabric.

[0070] Example 4: The difference between this example and Example 2 is that:

[0071] S1. Immerse the double-sided fabric to be treated in the polyethylene glycol composite solution prepared in Preparation Example 3 at a liquor ratio of 1:8. Pressurize at 5 MPa for 10 min, remove the double-sided fabric, heat to 65℃ for 20 min, and then air dry to complete the treatment and obtain knitted double-sided fabric. Lay the knitted double-sided fabric flat on the dyeing machine head and cut it into pieces according to the dyeing tubes of the dyeing machine. Seal the fabric ends and leave a 15 cm gap at the beginning of the double-sided fabric. Feed the fabric according to the dyeing liquor ratio of 1:10. First, add enzyme and glacial acetic acid for enzyme treatment. The enzyme is neutral cellulase, and the amount of enzyme added is 1% of the fabric weight. The amount of glacial acetic acid added is 0.1% of the dye liquor mass, and the mass fraction of glacial acetic acid is 99%. The temperature during enzyme treatment is 55℃ and the time is 45 min. Do not wash the fabric or drain the liquid after treatment to obtain pretreated fabric.

[0072] S2. Add dyeing auxiliaries and water to the pretreated fabric. The dyeing agent consists of 3 g / L leveling agent, 2 g / L dispersant, 3 g / L aminoboron nitride prepared in Preparation Example 4, and 2 g / L hydroxyapatite microspheres. The average length of the hydroxyapatite microspheres is 500 nm and the average diameter is 10 nm. The dispersant is sodium lignosulfonate. Adjust the pH to 5 with acid and run for 8 min. Add dye, which is a 1.4% (owf) disperse dye. After the dye is added, continue running for 10 min and then perform dyeing treatment. During the dyeing treatment, the temperature is raised to 135℃ for 30 min. Then, during the cooling process, the temperature is lowered to 80℃ at a rate of 2℃ / min and refined for 30 min to obtain the dyed fabric.

[0073] S3. Add 8g / L caustic soda and 3g / L EDTA to the dyed fabric, using water as the solvent, and treat at 60℃ for 40 minutes to complete the reduction cleaning. Then wash the fabric twice with water and dry it to obtain the finished fabric.

[0074] Example 5: The difference between this example and Example 2 is that:

[0075] The polyethylene glycol composite liquid in S1 did not contain polycaprolactone-modified cellulose or polymethyl methacrylate as a carrier.

[0076] Example 6: The difference between this example and Example 2 is that:

[0077] In S1, the polyethylene glycol composite liquid raw material is replaced with an equal mass of nanocellulose to replace polycaprolactone-modified cellulose.

[0078] Example 7: The difference between this example and Example 2 is that:

[0079] In S1, the polyethylene glycol composite liquid raw material is replaced with polymethyl methacrylate (PMMA) of equal mass.

[0080] Example 8: The difference between this example and Example 2 is that:

[0081] In the process of modifying nanocellulose with polycaprolactone, a raw material of polyethylene glycol composite liquid in S1, the cetearyl alcohol ethanol solution is replaced with an equal mass of ethyl cellulose ethanol solution.

[0082] Example 9: The difference between this example and Example 2 is that:

[0083] No aminoboron nitride or hydroxyapatite microspheres were added to the dyeing auxiliaries.

[0084] Example 10: The difference between this example and Example 2 is that:

[0085] In dyeing auxiliaries, nano-boron nitride is replaced with an equal mass of boron nitride.

[0086] Finished fabrics were prepared using the methods of Examples 1-5 and 8-10, respectively. The absorbance of the dye liquor before and after dyeing was compared by spectrophotometry. The dyeing percentage was then calculated as follows: Dyeing percentage = (A0-A1) / A0×100%, where A0 is the absorbance of the original dye liquor and A1 is the absorbance of the residual dye liquor after dyeing. The data were recorded.

[0087] Finished fabrics were prepared using the methods described in Examples 1-5, 7, and 9, respectively. Shrinkage was tested according to GB / T8630, and the data were recorded.

[0088] Finished fabrics were prepared using the methods described in Examples 1-10, and the breaking strength was tested according to GB / T3923.1, with data recorded.

[0089] Finished fabrics were prepared using the methods described in Examples 1-4, and their color fastness to washing was tested according to GB / T3921.1, with the grades recorded.

[0090] Table 1 Performance Test Table (In the table, " / " indicates that the corresponding item has no test data)

[0091]

[0092] As can be seen from Examples 1 and 2-4 and Table 1, the finished fabric prepared in this application has a good dyeing rate, low shrinkage rate, high breaking strength, and high color fastness, indicating that the fabric has good quality and high mechanical strength.

[0093] Combining Examples 2 and 5-10 with Table 1, it can be seen that in Example 5S1, the polyethylene glycol composite liquid raw material did not contain polycaprolactone-modified cellulose and polymethyl methacrylate as the carrier. Compared with Example 2, the fabric prepared in Example 5 had a lower dyeing rate, a higher shrinkage rate, and a lower breaking strength than that in Example 2. This indicates that the combination of polycaprolactone-modified cellulose and polymethyl methacrylate as the carrier can not only promote the dyeing of polyester-cotton fabrics but also, through their bonding and filling effects, resist fiber shrinkage and ensure that the finished fabric has high mechanical properties.

[0094] In Example 6S1, the polyethylene glycol composite liquid raw material was replaced with an equal mass of nanocellulose to replace polycaprolactone-modified cellulose. Compared with Example 2, the fabric prepared in Example 6 had a lower breaking strength than that in Example 2. This indicates that the addition of polycaprolactone can protect nanocellulose from the influence of cellulase. Combined with the bonding effect of polycaprolactone after hot melting, it can stably adhere nanocellulose to the gaps between the fibers of polyester-cotton fabric, thereby improving the mechanical strength of the finished fabric.

[0095] In Example 7S1, the polyethylene glycol composite liquid raw material was replaced with polymethyl methacrylate (PMMA) of equal mass. Compared with Example 2, the fabric prepared in Example 7 had a higher shrinkage rate and a lower breaking strength. This indicates that the addition of hydrogenated rosin pentaerythritol ester softens the hydrogenated rosin pentaerythritol ester during dyeing at a high temperature of around 130°C. This not only allows it to adhere between polyester fibers, improving shrinkage resistance, but also enhances the mechanical strength of the finished fabric.

[0096] In Example 8S1, during the process of modifying nanocellulose with polycaprolactone, a raw material of polyethylene glycol composite liquid, the same mass of ethyl cellulose ethanol solution was used to replace the cetearyl alcohol ethanol solution. Compared with Example 2, the fabric prepared in Example 8 had a lower dye uptake rate and a lower breaking strength than that in Example 2. This indicates that cetearyl alcohol contains hydroxyl groups that can adsorb dye molecules and promote fabric dyeing.

[0097] In Example 9, no aminoboron nitride and hydroxyapatite microspheres were added to the dyeing auxiliary agent. Compared with Example 2, the fabric prepared in Example 9 had a lower dyeing rate, a higher shrinkage rate, and a lower breaking strength than that in Example 2. This indicates that the addition of aminoboron nitride and hydroxyapatite microspheres can further promote dyeing and filling effect, resist fiber shrinkage, and improve the strength of the finished fabric.

[0098] In Example 10, the dyeing auxiliary agent was replaced with an equal mass of nano-boron nitride instead of amino boron nitride. Compared with Example 2, the fabric prepared in Example 10 had a lower dye uptake rate and a lower breaking strength. This indicates that the amino-modified boron nitride is more likely to connect with the polar groups on the fiber and the polar groups on the surface of polycaprolactone-modified cellulose and the carrier polymethyl methacrylate, thereby further improving the dye uptake rate and strength of the fabric.

[0099] This specific embodiment is merely an explanation of this application and is not intended to limit it. After reading this specification, those skilled in the art can make modifications to this embodiment without contributing any inventive step, but such modifications are protected by patent law as long as they fall within the scope of the claims of this application.

Claims

1. A short-process dyeing and finishing process for polyester-cotton school uniform fabric, characterized in that, Includes the following steps: S1. Immerse the double-sided fabric to be treated in a polyethylene glycol composite solution, apply pressure, remove the double-sided fabric, and then heat to 60-65℃ to complete the pretreatment, obtaining a knitted double-sided fabric. Next, add enzymes and glacial acetic acid to the knitted double-sided fabric for enzymatic treatment, without washing or draining the solution, to obtain a pretreated fabric. The polyethylene glycol composite solution consists of a polyethylene glycol aqueous solution (mass ratio 20:1-3:1-3), polycaprolactone-modified nanocellulose, and polymethyl methacrylate as the carrier. The polycaprolactone-modified nanocellulose is prepared by uniformly spraying a cetearyl alcohol ethanol solution onto the nanocellulose, and then adding polycaprolactone. After mixing and stirring evenly, polycaprolactone-modified nanocellulose is obtained; the mass ratio of nanocellulose, cetearyl alcohol ethanol solution and polycaprolactone is 1:0.2-0.3:0.2-0.3; the carrier polymethyl methacrylate is prepared by the following method: hydrogenated rosin pentaerythritol ester solution is uniformly sprayed onto the surface of polymethyl methacrylate twice, the mass ratio of hydrogenated rosin pentaerythritol ester solution and polymethyl methacrylate is 1:1-2, and after drying and dispersion, the finished product is obtained; the dyeing auxiliaries include leveling agent 2-3 g / L, dispersant 1-2 g / L, aminoboron nitride 1-3 g / L and hydroxyapatite microspheres 1-2 g / L; S2. Add dyeing auxiliaries and water to the pretreated fabric, adjust the pH with acid, add dye for dyeing treatment, and after refining, obtain the dyed fabric. S3. After the dyed fabric undergoes reduction washing, washing, and drying, the finished fabric is obtained.

2. The short-process dyeing and finishing process for polyester-cotton school uniform fabric according to claim 1, characterized in that: The S1 enzyme is a neutral cellulase, and the enzyme treatment temperature is 50-55℃ for 45-60 minutes.

3. The short-process dyeing and finishing process for polyester-cotton school uniform fabric according to claim 1, characterized in that, The pH of S2 is adjusted to 4-5 by adding acid, and the process is carried out for 8-12 minutes.

4. The short-process dyeing and finishing process for polyester-cotton school uniform fabric according to claim 1, characterized in that, The specific steps of the S2 staining treatment are as follows: treat at 120-135℃ for 30-50 min, and then cool down to 72-80℃ at a cooling rate of 1.5-2℃ / min.

5. The short-process dyeing and finishing process for polyester-cotton school uniform fabric according to claim 1, characterized in that, The dye is a disperse dye with 1-1.4% owf.

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