Printing slurry for knitted polyester cloth and preparation method thereof

Abstract

The present application discloses a printing paste for knitted polyester fabric and a preparation method thereof, which relates to the field of printing and dyeing. The raw materials are divided into two components, A and B. The raw materials of component A include, by weight, 8-12 parts of disperse dye nano-microcapsules, 2.5-3 parts of dispersant, 0.8-1.3 parts of stabilizer, and 25-35 parts of deionized water; the raw materials of component B include, by weight, 18-22 parts of protease, 15-18 parts of sodium alginate, 1-2.5 parts of thickener, and 0.8-1.2 parts of binder. , 2-4 parts of color fixing agent, 0.2-0.6 parts of defoaming agent, 45-60 parts of deionized water; the disperse dye nano microcapsules have a microcapsule wall made of a composite material of gelatin and sodium alginate, and a nano disperse dye as a capsule core; the weight ratio of the nano disperse dye, sodium alginate, and gelatin is 1: (1-1.3): (1.5-2.3); a printing paste is obtained by uniformly mixing components A and B; the present application has the effect of improving the color fastness of the printing paste and the color fastness to soaping and rubbing.

Description

Technical Field

[0001] The present application relates to the field of printing and dyeing, and in particular to a printing paste for knitted polyester cloth and a preparation method thereof. Background Art

[0002] Polyester fabrics are widely used in various textiles and apparel due to their high strength, good resilience, excellent abrasion resistance, dimensional stability, and wrinkle resistance. Knitted polyester fabrics are typically dyed using a high-temperature, high-pressure dyeing process on a high-temperature, high-pressure cheese dyeing machine. The printing paste used is typically composed of disperse dyes, dispersants, pastes, and thickeners.

[0003] The disperse dyes commonly used in printing pastes are powdered disperse dyes. Since disperse dyes do not contain strong hydrophilic groups such as sulfonic acid groups, but only contain some weak polar groups such as hydroxyl, amino, and nitro groups, their water solubility is very low. During dyeing, disperse dyes mainly exist in the form of fine particles dispersed in water, and have poor adhesion to polyester fibers, resulting in low color uptake, or the dyed polyester surface has a lot of floating color, low color fastness, and is prone to fading. Summary of the Invention

[0004] In order to improve the color fastness of polyester fabric, the present application provides a printing paste for knitted polyester fabric and a preparation method thereof.

[0005] The printing paste for knitted polyester fabric provided in this application adopts the following technical solution:

[0006] The raw materials include component A and component B. Component A includes, by weight, 8-12 parts of disperse dye nano-microcapsules, 2.5-3 parts of dispersant, 0.8-1.3 parts of stabilizer, and 25-35 parts of deionized water. Component B includes, by weight, 18-22 parts of protease, 15-18 parts of sodium alginate, 1-2.5 parts of thickener, 0.8-1.2 parts of binder, 2-4 parts of color fixative, 0.2-0.6 parts of defoamer, and 45-60 parts of deionized water. The disperse dye nano-microcapsules include a capsule core and a capsule wall wrapped around the capsule core, the capsule wall includes gelatin and sodium alginate, and the capsule core is a nano-dispersed dye. The weight ratio of the nano-dispersed dye, sodium alginate, and gelatin is 1:(1-1.3):(1.5-2.3).

[0007] By adopting the above technical solution, a composite material of gelatin and sodium alginate is used as the capsule wall and a disperse dye is used as the capsule core. This is because there are a large number of carboxyl groups in the sodium alginate molecular chain and it carries more negative charges in the aqueous solution. Gelatin is a protein with the special property of a zwitterionic electrolyte. When it is in an aqueous solution with a pH value of about 4, the gelatin solution contains the most positive charges. Therefore, in an aqueous solution with a pH value of about 4.0, gelatin and sodium alginate will neutralize and form a complex precipitated due to the opposite charges, which will encapsulate the disperse dye to form a nano-microcapsule. During transfer printing, the disperse dye is transferred to the polyester fabric and fixed to the fiber through protease transport. This not only improves the color uptake of the disperse dye, but also improves the color fastness.

[0008] Preferably, the protease is alkaline protease.

[0009] By adopting the above technical solution, the use of protease can, on the one hand, plasticize the polyester fiber, increase the activity of the fiber macromolecular chain segments, relax the fiber structure, thereby increasing the free volume of the polyester fiber, and improve the diffusion rate of the dye in the fiber, accelerate dyeing, make the dyeing effect uniform, and give the fabric better coloring rate, abrasion fastness, and washing fastness; on the other hand, through the transportation of protease, it can promote the uniform attachment of disperse dye nano-microcapsules to the polyester fiber, improve the levelness and coloring rate; alkaline protease is a protein hydrolase extracted by fermentation of Bacillus licheniformis, and its main component is Bacillus licheniformis protein. At a certain temperature, it can hydrolyze macromolecular proteins into products such as polypeptides and amino acids. After the wall material of the microcapsule is enzymatically hydrolyzed by alkaline protease, the sustained release rate of the disperse dye nano-microcapsules is also accelerated.

[0010] Preferably, the adhesive is acrylate.

[0011] By adopting the above technical solution and the adhesive acrylate, the dye can form a film at the printing and dyeing site, so that the dye is bonded to the polyester, so that the color will not fade, the printing and dyeing fastness is strong, and it is not easy to fade after friction and soap washing.

[0012] Preferably, the color fixing agent is polyester color fixing agent HH-365.

[0013] By adopting the above technical solution and using a fixing agent, the color fastness of the printing paste can be improved. The polyester fixing agent HH-365 can effectively act on disperse dyes, effectively improving the printing and dyeing fastness of disperse dyes, and is not easy to fade after friction and soap washing.

[0014] Preferably, the liquid disperse dye comprises the following components: the nano-microcapsule raw material further comprises, by weight: 30-50 parts of deionized water, 6-8 parts of emulsifier Tween 80, and 3-5 parts of sodium tripolyphosphate with a mass concentration of 0.8%.

[0015] By adopting the above technical solution, the emulsifier Tween 80 can be adsorbed at the oil / water interface to form an interfacial film, which has a protective effect on the dispersed droplets, making it difficult for the dispersed droplets to coalesce when they collide with each other, which is conducive to the preparation of microcapsules with uniform particle size and good surface morphology; by adopting sodium tripolyphosphate, the mutual reaction between the emulsion droplets can be reduced, thereby reducing cross-linking, making the solidified microcapsule particles more uniform.

[0016] Preferably, the dispersant comprises sodium polynaphthaldehyde sulfonate and sodium lignin sulfonate; the weight ratio of sodium polynaphthaldehyde sulfonate to sodium lignin sulfonate is 1:(1.5-2).

[0017] By adopting the above technical solution and compounding sodium polynaphthaldehyde sulfonate and sodium lignin sulfonate, the stability of liquid disperse dyes can be improved. Sodium polynaphthaldehyde sulfonate has the advantages of good dispersibility and high-temperature dispersion stability. When combined with the anionic surfactant sodium lignin sulfonate, it improves the dispersibility, which is beneficial to improving the dispersibility of disperse dye nanocapsules, thereby improving the leveling property and color uptake of printing paste.

[0018] The present application also provides a method for preparing a printing paste for knitted polyester fabric, which adopts the following technical solution:

[0019] S1. 2.5-3 parts of a dispersant, 0.8-1.3 parts of a stabilizer, and 25-35 parts of deionized water were mixed to obtain a mixed solution; 8-12 parts of disperse dye nanocapsules were added to the mixed solution and dispersed to obtain component A;

[0020] S2. After uniformly mixing 18-22 parts of protease, 15-18 parts of sodium alginate, 2-4 parts of a color fixing agent, and 45-60 parts of deionized water, 1-2.5 parts of a thickener, 0.8-1.2 parts of a binder, and 0.2-0.6 parts of a defoaming agent are added in sequence, and stirred evenly to obtain component B; component A is added to component B, and stirred evenly to obtain a printing paste.

[0021] By adopting the above technical solution, using disperse dye nano-microcapsules and utilizing the sustained-release properties of the microcapsules, it is beneficial to improve the color uptake and color fastness of the disperse dyes. At the same time, under the action of protease, the adhesion ability of the disperse dye nano-microcapsules on the polyester fibers is improved, thereby improving the color uptake and color fastness of the disperse dyes.

[0022] Preferably, the preparation method of the disperse dye nanocapsules comprises the following steps:

[0023] Gelatin is dissolved in 30-50 parts of deionized water, 6-8 parts of emulsifier Tween 80 is added and heated to dissolve, then nano-disperse dye is added, stirred and emulsified, and sodium alginate is added and dissolved completely, wherein the weight ratio of the nano-disperse dye, sodium alginate and gelatin is 1:(1-1.3):(1.5-2.3), the pH value is adjusted to 3-4, 3-5 parts of sodium tripolyphosphate with a mass concentration of 0.8% is added dropwise and stirred evenly; the obtained solution is freeze-dried to obtain disperse dye nano-microcapsules.

[0024] By adopting the above technical solution, a composite material of gelatin and sodium alginate is used as the capsule wall, and a disperse dye is used as the capsule core, and the disperse dye is coated to form a microcapsule. During transfer printing, the microcapsule is broken by the synergistic effect of high temperature and protease decomposing the gelatin on the surface, and is slowly released on the polyester fiber, so that the disperse dye is transferred to the polyester fabric and fixed on the fiber. This not only improves the coloring rate, but also improves the color fastness.

[0025] Preferably, the preparation of the nano-disperse dye comprises the following steps:

[0026] The disperse dye filter cake is mixed with zirconium oxide beads in a mass ratio of 1: (8-13), and the mixture is first coarsely ground; then finely ground to obtain nano-dispersed dye.

[0027] By adopting the above technical solution, nano-disperse dyes are used because the particle size of nano-disperse dyes becomes smaller and the specific surface area increases, which can improve the solubility and dissolution rate of disperse dyes, thereby improving the dyeing rate and color fastness and other properties; at the same time, the particle size distribution of nano-disperse dyes is uniform and the stability is good, which can improve the levelness of disperse dyes.

[0028] In summary, this application includes at least one of the following beneficial technical effects:

[0029] 1. The above technical solution uses a composite material of gelatin and sodium alginate as the capsule wall and a disperse dye as the capsule core. This is because the sodium alginate molecular chain contains a large number of carboxyl groups and carries a relatively high negative charge in aqueous solution. Gelatin is a protein with the special property of a zwitterionic electrolyte. When it is in an aqueous solution with a pH value of approximately 4, the gelatin solution contains the most positive charge. Therefore, in an aqueous solution with a pH value of approximately 4.0, gelatin and sodium alginate will neutralize and form a complex precipitated due to their opposite charges, which will encapsulate the disperse dye to form nano-microcapsules. During transfer printing, the disperse dye is transferred to polyester fabrics and fixed to the fibers through protease transport. This not only improves the color uptake of the disperse dye, but also improves the color fastness.

[0030] 2. By adopting the above technical solution, the use of protease can, on the one hand, plasticize the polyester fiber, increase the mobility of the fiber macromolecular chain segments, and relax the fiber structure, thereby increasing the free volume of the polyester fiber and improving the diffusion rate of the dye in the fiber, accelerating dyeing, making the dyeing effect uniform, and giving the fabric better color uptake, abrasion fastness, and washing fastness; on the other hand, through the delivery of protease, it can promote the uniform dispersion of disperse dye nanocapsules in the polyester fiber and improve the levelness of dyeing. Alkaline protease is a protein hydrolase extracted by fermentation of Bacillus licheniformis. Its main component is Bacillus licheniformis protein. At a certain temperature, it can hydrolyze macromolecular proteins into products such as polypeptides and amino acids. After the wall material of the microcapsule is enzymatically degraded by alkaline protease, the sustained release rate of the disperse dye is accelerated.

[0031] 3. By adopting the above technical solution, nano-disperse dyes are used because the particle size of nano-disperse dyes becomes smaller and the specific surface area increases, which can improve the solubility and dissolution rate of disperse dyes, thereby improving the dyeing rate and color fastness and other properties; at the same time, the particle size distribution of nano-disperse dyes is uniform and the stability is good, which can improve the levelness of disperse dyes. DETAILED DESCRIPTION

[0032] The present application is further described in detail below with reference to the embodiments.

[0033] Example

[0034] Example 1

[0035] S1. 30g of disperse dye filter cake was placed in a fully ceramic nano sand mill and ground. The disperse dye used in this embodiment is disperse yellow, with a chemical formula of C 18 H 11 NO3, grinding zirconium beads: 120g of 3.0mm zirconium beads and 120g of 0.6mm zirconium beads, coarse grinding at 1000r / min for 4h, keeping the total mass of the zirconium beads unchanged, the zirconium bead size is 0.3mm, the grinding speed is 2600r / min, and the grinding time is 3h to obtain nano-dispersed dye;

[0036] S2. 22.5 g of gelatin was dissolved in 30 g of deionized water, 6 g of emulsifier Tween 80 was added, and the mixture was heated to 60°C and fully dissolved under magnetic stirring at 800 rpm. Then, 15 g of nano-disperse dye was added in sequence, and after stirring and emulsification, 15 g of sodium alginate was added and dissolved completely. The pH value of the mixed solution was adjusted to 3 with a 10% mass fraction of dilute hydrochloric acid solution, and magnetic stirring was carried out at 25°C and 800 rpm for 30 min. 3 g of sodium tripolyphosphate with a mass concentration of 0.8 mg / mL was added dropwise and magnetic stirring was continued for 30 min. The resulting solution was freeze-dried to obtain disperse dye nanocapsules.

[0037] S3. 1.0 g of sodium polynaphthalene sulfonate, 1.5 g of sodium lignin sulfonate, 0.8 g of stabilizer, and 25 g of deionized water were ultrasonically dispersed at a temperature of 30 ° C and an ultrasonic frequency of 20 Hz for 60 min. The stabilizer used in this embodiment was olive oil to obtain a mixed solution; 8 g of disperse dye nanocapsules were added to the mixed solution and ultrasonically dispersed at a temperature of 30 ° C and an ultrasonic frequency of 25 Hz for 30 min to obtain component A;

[0038] S4. Place 18g alkaline protease, 15g sodium alginate, 2g polyester fixing agent HH-365, and 45g water into a stirring disperser, stir at 600rpm for 45min, and after mixing evenly, add 1g thickener, 0.8g acrylate, and 0.2g defoamer in sequence. In this embodiment, the thickener used is sodium polyacrylate and the defoamer is emulsified silicone oil. Stir at 200rpm for 90min to obtain component B; add component A to component B, stir at 300rpm for 40min to obtain a printing paste.

[0039] Example 2

[0040] The difference between Example 2 and Example 1 is that the process parameters for preparing the printing paste in Example 2 are different, as shown below:

[0041] S1. 30g of disperse dye filter cake was placed in a fully ceramic nano sand mill and ground. The disperse dye used in this embodiment is disperse yellow, with a chemical formula of C 18 H 11 NO3, grinding zirconium beads: 120g of 3.0mm zirconium beads and 120g of 0.6mm zirconium beads, coarse grinding at 1100r / min for 5h, keeping the total mass of the zirconium beads unchanged, the zirconium bead size is 0.3mm, the grinding speed is 2700r / min, and the grinding time is 4h to obtain nano-dispersed dye;

[0042] S2. 22.5 g of gelatin was dissolved in 40 g of deionized water, 6 g of emulsifier Tween 80 was added, and the mixture was heated to 70°C and fully dissolved under magnetic stirring at 900 rpm. Then, 15 g of nano-disperse dye was added in sequence, and after stirring and emulsification, 15 g of sodium alginate was added and dissolved completely. The pH value of the mixed solution was adjusted to 3 with a 10% mass fraction of dilute hydrochloric acid solution, and magnetic stirring was carried out at 30°C and 900 rpm for 40 min. 3 g of sodium tripolyphosphate with a mass concentration of 0.8 mg / mL was added dropwise and magnetic stirring was continued for 40 min. The resulting solution was freeze-dried to obtain disperse dye nanocapsules.

[0043] S3. 1.0 g of polynaphthaldehyde sodium salt, 1.5 g of sodium lignin sulfonate, 0.8 g of stabilizer, and 30 g of deionized water were ultrasonically dispersed at a temperature of 35 ° C and an ultrasonic frequency of 25 Hz for 90 min. In this embodiment, the stabilizer used was olive oil to obtain a mixed solution; 8 g of disperse dye nanocapsules were added to the mixed solution and ultrasonically dispersed at a temperature of 35 ° C and an ultrasonic frequency of 25 Hz for 45 min to obtain component A;

[0044] S4. Place 18g alkaline protease, 15g sodium alginate, 2g polyester fixing agent HH-365, and 53g water into a stirring disperser, stir at 700rpm for 60min, and after mixing evenly, add 1.7g thickener, 0.8g acrylate, and 0.4g defoamer in sequence. In this embodiment, the thickener is sodium polyacrylate and the defoamer is emulsified silicone oil. Stir at 300rpm for 120min to obtain component B; add component A to component B, stir at 400rpm for 50min, and obtain a printing paste.

[0045] Example 3

[0046] The difference between Example 3 and Example 1 is that the process parameters for preparing the printing paste in Example 3 are different, as shown below:

[0047] S1. 30g of disperse dye filter cake was placed in a fully ceramic nano sand mill and ground. The disperse dye used in this embodiment is disperse yellow, with a chemical formula of C 18 H 11 NO3, grinding zirconium beads: 120g of 3.0mm zirconium beads and 120g of 0.6mm zirconium beads, coarse grinding at 1200r / min for 6h, keeping the total mass of the zirconium beads unchanged, the zirconium bead size is 0.3mm, the grinding speed is 2800r / min, and the grinding time is 5h to obtain nano-dispersed dye;

[0048] S2. 22.5 g of gelatin was dissolved in 50 g of deionized water, 6 g of emulsifier Tween 80 was added, and the mixture was heated to 75 ° C. and fully dissolved under magnetic stirring at 1000 rpm. Then, 15 g of nano-disperse dye was added in sequence. After stirring and emulsification, 15 g of sodium alginate was added and dissolved completely. The pH value of the mixed solution was adjusted to 3 with a 10% mass fraction of dilute hydrochloric acid solution. The mixture was magnetically stirred at 35 ° C. and 1000 rpm for 45 minutes, and 3 g of sodium tripolyphosphate with a mass concentration of 0.8 mg / mL was added dropwise, and magnetic stirring was continued for 45 minutes. The resulting solution was freeze-dried to obtain disperse dye nanocapsules;

[0049] S3. 1.0 g of sodium polynaphthalene sulfonate, 1.5 g of sodium lignin sulfonate, 0.8 g of stabilizer, and 30 g of deionized water were ultrasonically dispersed at a temperature of 40 ° C and an ultrasonic frequency of 30 Hz for 120 min. The stabilizer used in this embodiment was olive oil to obtain a mixed solution; 8 g of disperse dye nanocapsules were added to the mixed solution and ultrasonically dispersed at a temperature of 40 ° C and an ultrasonic frequency of 30 Hz for 60 min to obtain component A;

[0050] S4. Place 18g alkaline protease, 15g sodium alginate, 2g polyester fixing agent HH-365, and 60g water into a stirring disperser, stir at 750rpm for 90min, and after mixing evenly, add 2.5g thickener, 0.8g acrylate, and 0.6g defoamer in sequence. In this embodiment, the thickener is sodium polyacrylate and the defoamer is emulsified silicone oil. Stir at 400rpm for 150min to obtain component B; add component A to component B, stir at 450rpm for 60min to obtain a printing paste.

[0051] Examples 4-5

[0052] The difference between Example 4-5 and Example 1 is that the process parameters for preparing the printing paste S1 in Example 4-5 are different, as shown in Table 1:

[0053] Table 1 Process parameters for preparing printing paste S1 in Example 4-5

[0054]

[0055] Examples 6-13

[0056] The difference between Example 6-13 and Example 1 is that the process parameters for preparing the printing paste S2 in Example 6-13 are different, as shown in Table 2:

[0057] Table 2 Process parameters for preparing printing paste S2 in Examples 6-13

[0058]

[0059] Examples 14-21

[0060] The difference between Examples 14-21 and Example 1 is that the process parameters for preparing the printing paste S3 in Examples 14-21 are different, as shown in Table 3:

[0061] Table 3 Process parameters for preparing printing paste S3 in Examples 14-21

[0062]

[0063] Examples 20-27

[0064] The difference between Examples 20-27 and Example 1 is that the process parameters for preparing the printing paste S4 in Examples 20-27 are different, as shown in Table 4:

[0065] Table 4 Process parameters for preparing printing paste S4 in Examples 20-27

[0066]

[0067] Comparative Example

[0068] Comparative Example 1-2

[0069] The difference between Comparative Example 1-2 and Example 1 is that the process parameters for preparing the printing paste S1 in Comparative Example 1-2 are different, as shown in Table 5:

[0070] Table 5 Process parameters for preparing printing paste S1 in Comparative Example 1-2

[0071]

[0072] Comparative Examples 3-10

[0073] The difference between Comparative Example 3-10 and Example 1 is that the process parameters for preparing the printing paste S2 in Comparative Example 3-10 are different, as shown in Table 6:

[0074] Table 6 Process parameters for preparing printing paste S2 in comparative examples 3-10

[0075]

[0076] Comparative Examples 11-18

[0077] The difference between Comparative Examples 11-18 and Example 1 is that the process parameters for preparing printing paste S3 in Comparative Examples 11-18 are different, as shown in Table 7:

[0078] Table 7 Process parameters for preparing printing paste S3 in Comparative Examples 11-18

[0079]

[0080]

[0081] Comparative Examples 17-24

[0082] The difference between Comparative Examples 17-24 and Example 1 is that the process parameters for preparing printing paste S4 in Comparative Examples 17-24 are different, as shown in Table 8:

[0083] Table 8 Process parameters for preparing printing paste S4 in comparative examples 17-24

[0084]

[0085] Comparative Example 25

[0086] The difference between Comparative Example 25 and Example 1 is that the color fixing agent used in the preparation of printing paste S4 in Comparative Example 25 is cetylpyridinium chloride.

[0087] Comparative Example 26

[0088] The difference between Comparative Example 30 and Example 1 is that the binder used in preparing the printing paste S4 in Comparative Example 30 is starch.

[0089] Performance testing

[0090] The knitted polyester fabric was dyed according to the dyeing process, and the printing paste prepared by Example 1-31 and Comparative Example 1-30 was used to perform the following tests on the dyed products:

[0091] 1. Using GB / T3921.1-2008 "Textiles - Tests for Colour Fastness - Colour Fastness to Washing" the products dyed with the printing pastes prepared in Examples 1-31 and Comparative Examples 1-30 were tested for colour fastness to washing;

[0092] 1. The color fastness to rubbing of the products dyed with the printing pastes prepared in Examples 1-31 and Comparative Examples 1-30 was tested using GB / T3920-1997 "Textiles - Tests for Color Fastness - Color Fastness to Rubbing";

[0093] 2. The color uptake of the products dyed with the printing pastes prepared in Examples 1-31 and Comparative Examples 1-30 was tested using GB / T9337-2009 "Determination of the color uptake of disperse dyes at high temperature".

[0094] The specific test results are shown in Table 10:

[0095]

[0096]

[0097] It can be seen from the test results of Examples 1, 2, and 3 that the process parameters for preparing the printing paste provided in the present application can improve the color uptake rate of knitted polyester fabric, and at the same time have higher color fastness to soaping and color fastness to rubbing.

[0098] It can be seen from the test results of Examples 1, 4, 5 and Comparative Examples 1 and 2 that as the mass ratio of disperse dye filter cake to zirconium beads increases, the grades of color fastness to soaping and color fastness to rubbing increase, and the coloring rate increases. However, when the mass ratio of disperse dye filter cake to zirconium beads increases to 1:13, the coloring rate no longer changes. As the mass ratio continues to increase, the grades of color fastness to soaping and color fastness to rubbing deteriorate, and the coloring rate gradually decreases.

[0099] From the test results of Examples 1, 6, 7 and Comparative Examples 3 and 4, it can be seen that when the weight ratio of nano-dispersed dye, sodium alginate and gelatin is lower than the range of 1:(1-1.3):(1.5-2.3), the color fastness to soaping and the color fastness to rubbing, and the coloring rate are small, but when the weight ratio of nano-dispersed dye, sodium alginate and gelatin exceeds the range of 1:(1-1.3):(1.5-2.3), the color fastness to soaping, the color fastness to rubbing and the coloring rate do not change.

[0100] From the test results of Examples 1, 8, 9 and Comparative Examples 5 and 6, it can be seen that when the mass of the emulsifier Tween 80 increases, the grades of color fastness to soaping and color fastness to rubbing increase, and the color uptake rate gradually increases. When the mass of the emulsifier Tween 80 increases to 8g, the color uptake rate decreases, and the grades of color fastness to soaping and color fastness to rubbing do not change. When the mass of the emulsifier Tween 80 increases to 8g, the grades of color fastness to soaping and color fastness to rubbing decrease, and the color uptake rate also decreases.

[0101] From the test results of Examples 1, 10, 11 and Comparative Examples 7 and 8, it can be seen that when the mass of sodium tripolyphosphate is less than 3 g, the color fastness to soaping and the color fastness to rubbing are low, and the coloring rate is low. When the mass of sodium tripolyphosphate increases, the coloring rate increases, and the color fastness to soaping and the color fastness to rubbing are improved. However, when the mass of sodium tripolyphosphate is greater than 5 g, the color fastness to soaping and the color fastness to rubbing are low, and the coloring rate gradually decreases.

[0102] From the test results of Examples 1, 12, 13 and Comparative Examples 9 and 10, it can be seen that when the pH value is less than 3-4, the color fastness to soaping and the color fastness to rubbing are low, and the color uptake rate is low. When the pH value is in the range of 3-4, the color uptake rate increases, and the color fastness to soaping and the color fastness to rubbing are improved. However, when the mass of sodium tripolyphosphate is greater than 4 g, the color fastness to soaping and the color fastness to rubbing are low, and the color uptake rate gradually decreases.

[0103] From the test results of Examples 1, 14, 15 and Comparative Examples 11 and 12, it can be seen that when the weight ratio of sodium polynaphthaldehyde sulfonate and sodium lignin sulfonate is less than 1: (1.5-2) range, the color fastness to soaping and the color fastness to rubbing grades decrease, and the coloring rate also decreases. When the weight ratio of sodium polynaphthaldehyde sulfonate and sodium lignin sulfonate is in the range of 1: (1.5-2), the coloring rate increases, and the color fastness to soaping and the color fastness to rubbing grades improve. However, when the weight ratio of sodium polynaphthaldehyde sulfonate and sodium lignin sulfonate exceeds the range of 1: (1.5-2), the color fastness to soaping and the color fastness to rubbing grades begin to decrease again, and the coloring rate also begins to decrease.

[0104] From the test results of Examples 1, 16, 17 and Comparative Examples 13 and 14, it can be seen that when the mass of the stabilizer increases, the grades of color fastness to soaping and color fastness to rubbing increase, and the coloring rate also gradually increases. When the mass of the stabilizer reaches 1.3 g, it no longer changes.

[0105] From the test results of Examples 1, 18, 19 and Comparative Examples 15 and 16, it can be seen that when the mass of disperse dye nano-microcapsules increases, the grades of color fastness to soaping and color fastness to rubbing increase, and the coloring rate also gradually increases. When the mass of disperse dye nano-microcapsules exceeds 12 g, the coloring rate no longer changes.

[0106] From the test results of Examples 1, 20, 21 and Comparative Examples 17 and 18, it can be seen that when the mass of alkaline protease increases, the color fastness to soaping and the color fastness to rubbing grades increase, and the coloring rate also gradually increases. However, when the mass of protease exceeds 22 g, the color fastness to soaping and the color fastness to rubbing grades and the coloring rate all begin to decrease.

[0107] From the test results of Examples 1, 22, 23 and Comparative Examples 19 and 20, it can be seen that the increase in the mass of sodium alginate has little effect on the color fastness to soaping, the color fastness to rubbing grades and the color uptake rate, and the color uptake rate and the color fastness to soaping and the color fastness to rubbing grades increase slightly.

[0108] The test results of Examples 1, 24, and 25 and Comparative Examples 21 and 22 show that as the fixing agent content increases, the color fastness to soaping and rubbing, and the color uptake rate gradually increase. When the fixing agent content exceeds 4 g, there is no change. Comparative Example 25 shows that the polyester fixing agent HH-365 provided by the present application is more conducive to improving the color fastness to soaping and rubbing, as well as the color uptake rate.

[0109] The test results of Examples 1, 26, and 27 and Comparative Examples 23 and 24 show that as the binder content increases, the color fastness to soaping and the color fastness to rubbing grades and the color uptake rate gradually increase. When the binder content exceeds 1.2 g, there is no change. Comparative Example 26 shows that the binder acrylate provided by the present application is more conducive to improving the color fastness to soaping and the color fastness to rubbing grades and the color uptake rate.

[0110] This specific embodiment is merely an explanation of the present application and is not a limitation of the present application. After reading this specification, those skilled in the art may make non-creative modifications to the present embodiment as needed, but as long as they are within the scope of the claims of the present application, they are protected by the patent law.

Claims

1. A printing paste for knitted polyester fabric, characterized in that: The raw materials include component A and component B. Component A includes, by weight, 8-12 parts of disperse dye nano-microcapsules, 2.5-3 parts of dispersant, 0.8-1.3 parts of stabilizer, and 25-35 parts of deionized water. Component B includes, by weight, 18-22 parts of protease, 15-18 parts of sodium alginate, 1-2.5 parts of thickener, 0.8-1.2 parts of binder, 2-4 parts of color fixing agent, 0.2-0.6 parts of defoaming agent, and 45-60 parts of deionized water. The dispersants are sodium polynaphthalene formaldehyde sulfonate and sodium lignin sulfonate; The disperse dye nano-microcapsules include a capsule core and a capsule wall wrapped around the capsule core, wherein the capsule wall includes gelatin and sodium alginate, and the capsule core is a nano-dispersed dye; the weight ratio of the nano-dispersed dye, sodium alginate, and gelatin is 1:(1-1.3):(1.5-2.3); the raw materials for preparing the disperse dye nano-microcapsules also include, by weight, 30-50 parts of deionized water, 6-8 parts of emulsifier Tween 80, and 3-5 parts of sodium tripolyphosphate with a mass concentration of 0.8%; the preparation method of the disperse dye nano-microcapsules includes the following steps: Gelatin is dissolved in 30-50 parts of deionized water, 6-8 parts of emulsifier Tween 80 is added and heated to dissolve, then nano-disperse dye is added, stirred and emulsified, and sodium alginate is added and dissolved completely, wherein the weight ratio of the nano-disperse dye, sodium alginate, and gelatin is 1:(1-1.3):(1.5-2.3), the pH value is adjusted to 3-4, 3-5 parts of sodium tripolyphosphate with a mass concentration of 0.8% is added dropwise and stirred evenly; the obtained solution is freeze-dried to obtain disperse dye nano-microcapsules.

2. The printing paste for knitted polyester fabric according to claim 1, characterized in that: The protease is alkaline protease.

3. The printing paste for knitted polyester fabric according to claim 1, characterized in that: The adhesive is acrylate.

4. The printing paste for knitted polyester fabric according to claim 1, characterized in that: The color fixing agent is polyester color fixing agent HH-365.

5. The printing paste for knitted polyester fabric according to claim 1, characterized in that: The weight ratio of the sodium salt of polynaphthalene formaldehyde sulfonate to sodium lignin sulfonate is 1:(1.5-2).

6. A method for preparing a printing paste for knitted polyester fabric according to any one of claims 1 to 5, characterized in that: The following steps are involved: S1. 2.5-3 parts of a dispersant, 0.8-1.3 parts of a stabilizer, and 25-35 parts of deionized water were mixed to obtain a mixed solution; 8-12 parts of disperse dye nanocapsules were added to the mixed solution and dispersed to obtain component A; S2. After uniformly mixing 18-22 parts of protease, 15-18 parts of sodium alginate, 2-4 parts of a color fixing agent, and 45-60 parts of deionized water, 1-2.5 parts of a thickener, 0.8-1.2 parts of a binder, and 0.2-0.6 parts of a defoaming agent are added in sequence, and stirred evenly to obtain component B; component A is added to component B, and stirred evenly to obtain a printing paste.

7. The method for preparing a printing paste for knitted polyester fabric according to claim 6, wherein: The preparation of the nano-disperse dye comprises the following steps: The disperse dye filter cake is mixed with zirconium oxide beads in a mass ratio of 1: (8-13), and the mixture is first coarsely ground; then finely ground to obtain nano-dispersed dye.

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