Thermal transfer printing ink as well as preparation method and application thereof

Abstract

The invention relates to the technical field of digital printing, in particular to heat transfer printing ink and a preparation method and application thereof. The heat transfer printing ink provided by the invention comprises the following components in parts by mass: 20-40 parts of disperse dye color paste and 3-5 parts of a self-crosslinking agent, and the crosslinking temperature of the self-crosslinking agent is greater than or equal to 75 DEG C. The self-crosslinking agent is added into the heat transfer printing ink, the self-crosslinking agent can be hydrolyzed in a high-temperature state, generated hydroxyl and acrylamide groups of the self-crosslinking agent are subjected to crosslinking reaction to form an insoluble network structure, so that a surfactant in the fabric cannot freely move to form micelles, and by preventing solubilization of the surfactant, the heat transfer printing effect is improved. The dye does not migrate outwards, so that the color migration fastness of the heat transfer printing ink on the fabric is improved. The use amount of the self-crosslinking agent is limited to be 3-5 parts, so that the color migration fastness of the heat transfer printing ink can be further improved, and the jet stability can also be ensured.

Description

Technical Field

[0001] The present invention relates to the technical field of digital printing, and in particular to a thermal transfer ink and a preparation method and application thereof. Background Art

[0002] With the development of digital printing technology, textile printing has entered a new era. Digital printing uses inkjet printers to directly spray dyes onto fabrics, achieving high flexibility and accuracy. However, color migration will occur in textile printing products during production, storage, transportation and use. For example, printed and dyed clothing, shoes, flags, home textiles, umbrellas, tents, etc. are prone to color migration (dye transfers from the fabric to another fabric in contact with it), which affects the appearance quality of the product, brings a bad experience to consumers, causes product scrapping, and brings huge economic losses to the company.

[0003] There are two cases of color migration in textiles. In the first case, when the temperature reaches a certain temperature (usually ≥130℃), the dye in the fiber turns directly from solid to gas and escapes. When the escaped dye is cooled, it condenses into solid and sticks to the fabric surface or other fabrics. It usually appears as disperse dye. This is a thermal migration phenomenon, also commonly known as sublimation fastness. In the second case, when the temperature is lower than the sublimation temperature of the dye and the dye cannot sublimate, the dye of fabrics composed of different colors migrates from one place to another during storage or use, usually the dark part transfers to the light part. This phenomenon is usually called color migration.

[0004] Color migration after disperse dyeing refers to the migration of disperse dyes due to the influence of auxiliaries after polyester is dyed with disperse dyes. The color migration phenomenon is a redistribution phenomenon of disperse dyes in two-phase solvents (polyester fiber and auxiliaries). Therefore, all auxiliaries that can dissolve disperse dyes can produce color migration effects. If there is no second-phase solvent, there will be no color migration phenomenon; if the second-phase solvent is weakly soluble in the dye, or the amount of the second-phase solvent is small, the color migration phenomenon will also be weakened accordingly. The reason for the color migration phenomenon is that the auxiliaries on the outer layer of the fiber dissolve the disperse dyes, and the disperse dyes migrate from the inside of the fiber through the fiber capillaries to the surface of the fiber, causing the disperse dyes to accumulate on the surface of the fiber, causing a series of effects, such as staining, decreased color fastness, etc. This decreased fastness is collectively referred to as color migration fastness. Disperse dye color migration is related to the molecular structure of the dye itself, but has no absolute relationship with the sublimation fastness of the dye, that is, the color migration fastness of disperse dyes with good sublimation fastness is not necessarily good. The widespread use of surfactants is the main reason for the color migration of disperse dyes. Since disperse dyes with different structures have different solubilities in non-ionic surfactants, the degree of decrease in color migration fastness of different dyes is different. For example, the use of amino silicone microemulsion softeners is also the reason for the decrease in color migration fastness of disperse dyes. Since a large amount of emulsifiers in softeners become the second solvent for disperse dyes, the post-dyeing color migration of disperse dyes is aggravated, affecting the color migration fastness.

[0005] In order to give the existing textile fabrics a better user experience, they are pre-treated. This is a finishing technology that can give the fabrics multiple functionalities. It broadens the use of fabrics and increases the added value of products. It is currently widely used in clothing and industrial textiles. Pre-treatment is mainly composed of functional additives such as non-ionic surfactants, silicone emulsions, emulsifiers, etc. However, the presence of these functional additives forms a second solvent for the fabric, which causes color migration during the post-dyeing processing and storage of the fabric. Summary of the invention

[0006] Therefore, the technical problem to be solved by the present invention is to overcome the influence of the second solvent formed by the functional additives in the textile fabric on the color fastness of the textile fabric after printing, thereby providing a preparation method and application of thermal transfer ink.

[0007] On the one hand, the present invention provides a thermal transfer ink, comprising the following components in parts by weight: 20-40 parts of disperse dye paste; 3-5 parts of self-crosslinking agent, wherein the crosslinking temperature of the self-crosslinking agent is greater than or equal to 75°C.

[0008] Preferably, the self-crosslinking agent comprises acetoxy-modified acrylamide.

[0009] In the application of thermal transfer ink, the transfer paper or transfer film needs to be dried after printing, and the thermal transfer printing process is carried out after winding. Too low a temperature will prevent the ink from being dried, and the image will be sticky and cannot be used after winding. The common drying process temperature in production is controlled at 60-70°C. If the cross-linking temperature of the self-crosslinking agent is lower than 75°C, the cross-linking effect will occur during the drying process, cross-linking on the transfer paper or transfer film, and during transfer printing, an insoluble network cannot be formed on the fabric to prevent the solubilization effect of the surfactant, and the function of improving the color migration fastness is lost. Therefore, the cross-linking temperature of the high-temperature self-crosslinking agent is higher than 75°C. The self-cross-linking temperature of the acetoxy-modified acrylamide provided by the present invention is above 75°C.

[0010] In order to adjust the surface tension of the thermal transfer ink and improve the dispersibility of each raw material in the thermal transfer ink, the thermal transfer ink further includes a surfactant, and the surfactant includes a non-ionic surfactant.

[0011] Preferably, the nonionic surfactant includes at least one of acetylenic glycol ethoxylates, modified organic siloxanes, and polyether siloxane copolymers.

[0012] Among them, the modified organosiloxane is a compound formed by combining an organosilicon compound with other compounds through a chemical reaction. This modification can significantly improve the performance of the organosiloxane, and an example is polyether-modified siloxane.

[0013] In some of the embodiments, the disperse dye in the disperse dye paste includes at least one of a low-temperature type and a medium-temperature type.

[0014] In some embodiments, the thermal transfer ink further includes a co-solvent, and the co-solvent includes a polyol.

[0015] In some embodiments, the weight portion of the co-solvent is 15-25 parts.

[0016] Preferably, the polyol comprises a diol, and the molecular weight of the diol is 55 to 100. More preferably, the polyol comprises at least one of ethylene glycol, 1,4-butanediol or 1,2-propylene glycol.

[0017] In order to form a micro film on the surface of transfer paper or transfer film by thermal transfer ink, a high molecular polymer is added to the thermal transfer ink so that the printed ink is retained on the surface of the transfer paper or transfer film and a clear pattern sharpness is obtained. The high molecular polymer includes at least one of styrene maleic anhydride copolymer, styrene acrylic acid copolymer and acrylic acid polymer.

[0018] Adding too much high molecular polymer will cause the ink fluidity to deteriorate, and the jetting stability for continuous printing is not good. At the same time, it is easy to form a micro film on the nozzle surface when it is in standby for a long time, causing nozzle clogging; adding too little high molecular polymer will cause the ink to fail to form a micro film when printed on the transfer paper or transfer film, and the lateral penetration of the ink is not well controlled, resulting in a decrease in the clarity of the pattern. In order to improve the jetting stability of thermal transfer ink and control the clarity of ink printing, in some embodiments, the weight of the high molecular polymer is 1-4 parts, preferably 1-3 parts.

[0019] In order to reduce the amount of polyol added, which is beneficial for the ink to dry quickly during the printing process, and has good moisture retention on the surface of the nozzle, and can provide continuous and smooth printing performance, a humectant is used in the embodiment of the present invention to replace the moisturizing effect of part of the polyol, thereby reducing the amount of polyol added, which is beneficial for the ink to dry quickly during the printing process, and has good moisture retention on the surface of the nozzle, and can provide continuous and smooth printing performance. The thermal transfer ink also includes a humectant, and the humectant includes sorbitol.

[0020] In order to improve the moisturizing property of thermal transfer ink, ensure the jetting stability of continuous printing, and print onto transfer paper or transfer film at the same time, the customer can quickly dry the ink, so that the temperature of the drying process can be controlled at 60-70°C, and the drying purpose can be achieved without increasing the temperature. In some embodiments, the weight portion of the moisturizing agent is 2-6 parts, preferably 3-5 parts.

[0021] In some embodiments, the thermal transfer ink further includes a bactericide, and the bactericide includes 1,2-benzisothiazol-3-one.

[0022] In some embodiments, the weight portion of the bactericide is 0.1-0.3 parts.

[0023] On the other hand, the application of the above-mentioned thermal transfer ink provided by the present invention in digital printing includes the following steps: printing the printed pattern onto transfer paper through a nozzle, drying at 50-70°C, transferring at 200-225°C for 10-25s, and transferring the ink to the fabric.

[0024] The technical solution of the present invention has the following advantages:

[0025] 1. A thermal transfer ink provided by the present invention comprises the following components in parts by weight: 20-40 parts of disperse dye paste; 3-5 parts of self-crosslinking agent, wherein the crosslinking temperature of the self-crosslinking agent is greater than or equal to 75°C. The present invention adds a self-crosslinking agent to the thermal transfer ink, and the self-crosslinking agent can be hydrolyzed under high temperature, and the generated hydroxyl group and its own acrylamide group undergo a crosslinking reaction to form an insoluble network structure, so that the surfactant in the fabric cannot move freely to form micelles, thereby preventing solubilization. By preventing the solubilization of the surfactant, the dye will not migrate outward, thereby improving the color migration fastness of the thermal transfer ink on the fabric. At the same time, the present invention limits the amount of the self-crosslinking agent. On the one hand, the addition of too much self-crosslinking agent causes the ink fluidity to deteriorate, and the jetting stability of continuous printing is not good. Too little addition of high-temperature self-crosslinking agent will cause the ink to be insufficiently crosslinked with the fabric during transfer, and the insoluble network cannot be formed well to prevent the solubilization of the surfactant, so that the migration fastness after transfer is reduced. The present invention limits the amount of the self-crosslinking agent to 3-5 parts, thereby not only further improving the color migration fastness of the thermal transfer ink, but also ensuring the jetting stability.

[0026] 2. The present invention provides a thermal transfer ink, which further includes a humectant. The present invention replaces the moisturizing effect of part of the polyol by adding a humectant, reduces the amount of polyol added, is conducive to rapid drying of the ink during printing, and has good moisturizing properties on the nozzle surface, and can provide continuous and smooth printing performance.

[0027] 3. The present invention provides a thermal transfer ink, wherein the weight portion of the humectant is 2-6 parts, preferably 3-5 parts. The present invention provides a thermal transfer ink containing 2-6 parts, preferably 3-5 parts, of a humectant, which can not only ensure that the ink has good nozzle moisturizing properties, ensure the jetting stability of continuous printing, and reduce the drying temperature during transfer, which can not only achieve rapid drying, but also avoid high-temperature drying, which causes the self-crosslinking agent to crosslink during drying, thereby affecting the color migration fastness.

[0028] 4. The present invention provides a thermal transfer ink, which further comprises a high molecular polymer. The present invention can form a micro film on the surface of transfer paper or transfer film by adding a high molecular polymer to the thermal transfer ink, so that the printed ink remains on the surface of the transfer paper or transfer film, and a clear pattern sharpness is obtained.

[0029] 5. The present invention provides a thermal transfer ink, wherein the weight portion of the polymer is 1-4 parts, preferably 1-3 parts. Too much polymer addition will cause poor ink fluidity and affect the jetting stability of continuous printing. At the same time, it is easy to form a microfilm on the surface of the nozzle in the case of long-term standby, causing nozzle clogging; too little polymer addition will not form a good microfilm during transfer, and the lateral permeation of the ink is not well controlled, resulting in reduced pattern clarity. DETAILED DESCRIPTION

[0030] The following examples are provided for a better understanding of the present invention, but are not intended to limit the best mode of implementation, nor to limit the content and protection scope of the present invention. Any product identical or similar to the present invention obtained by anyone under the inspiration of the present invention or by combining the features of the present invention with other prior arts shall fall within the protection scope of the present invention.

[0031] If no specific experimental steps or conditions are specified in the examples, the conventional experimental steps or conditions described in the literature in the field can be used. If no manufacturer is specified for the reagents or instruments used, they are all conventional reagent products that can be obtained commercially.

[0032] The polymer in this embodiment was purchased from BASF, Germany, and the model number is Joncryl1187.

[0033] The self-crosslinking agent was acetoxy-modified acrylamide (MEMA), purchased from Baiyuan Chemical, China.

[0034] The surfactant was purchased from Evonik, Germany, with the model number being Surfynol 465.

[0035] Example 1

[0036] This embodiment provides a method for preparing thermal transfer ink, and the specific steps and parameters are as follows:

[0037] Take 35g of Disperse Red 60 color paste, 10g of ethylene glycol, 10g of 1,2-propylene glycol, 1g of high molecular weight polymer styrene maleic anhydride copolymer, 3g of self-crosslinking agent acetoxy-modified acrylamide, 4g of sorbitol, 1g of surfactant 2-ethoxy-1-ethynol, 0.2g of 1,2-benzisothiazol-3-one (BIT), and dilute to 100mL with deionized water, stir at 100rpm for 30min, and filter through a 0.5μm pore size filter membrane to obtain a thermal transfer ink.

[0038] Example 2

[0039] This embodiment provides a method for preparing a thermal transfer ink. The specific steps and parameters are the same as those in Embodiment 1, except that the amount of the high molecular weight polymer is 3 g.

[0040] Example 3

[0041] This embodiment provides a method for preparing a thermal transfer ink, and the specific steps and parameters are the same as those of Embodiment 1, except that the amount of the self-crosslinking agent is 5 g.

[0042] Example 4

[0043] This embodiment provides a method for preparing a thermal transfer ink. The specific steps and parameters are the same as those in Embodiment 1, except that the amount of the high molecular weight polymer is 3 g and the amount of the self-crosslinking agent is 5 g.

[0044] Example 5

[0045] This embodiment provides a method for preparing a thermal transfer ink, and the specific steps and parameters are the same as those of embodiment 1, except that the method does not contain a high molecular weight polymer, that is,

[0046] Take 35g of Disperse Red 60 color paste, 10g of ethylene glycol, 10g of 1,2-propylene glycol, 3g of self-crosslinking agent acetoxy-modified acrylamide, 4g of sorbitol, 1g of surfactant 2-ethoxy-1-ethynol, 0.2g of 1,2-benzisothiazol-3-one (BIT), and dilute to 100mL with deionized water, stir at 100rpm for 30min, and filter through a 0.5μm pore size filter membrane to obtain a thermal transfer ink.

[0047] Example 6

[0048] This embodiment provides a method for preparing a thermal transfer ink. The specific steps and parameters are the same as those in Embodiment 5, except that the self-crosslinking agent is 5 g, that is,

[0049] Take 35g of Disperse Red 60 color paste, 10g of ethylene glycol, 10g of 1,2-propylene glycol, 5g of self-crosslinking agent acetoxy-modified acrylamide, 4g of sorbitol, 1g of surfactant 2-ethoxy-1-ethynol, 0.2g of 1,2-benzisothiazol-3-one (BIT), and dilute to 100mL with deionized water, stir at 100rpm for 30min, and filter through a 0.5μm pore size filter membrane to obtain a thermal transfer ink.

[0050] Example 7

[0051] This embodiment provides a method for preparing a thermal transfer ink, and the specific steps and parameters are the same as those of Embodiment 3, except that sorbitol is not contained, that is,

[0052] Take 35g of Disperse Red 60 color paste, 10g of ethylene glycol, 10g of 1,2-propylene glycol, 1g of high molecular weight polymer styrene maleic anhydride copolymer, 5g of self-crosslinking agent acetoxy-modified acrylamide, 1g of surfactant 2-ethoxy-1-ethynol, 0.2g of 1,2-benzisothiazol-3-one (BIT), and deionized water to make the volume to 100mL, stir at 100rpm for 30min, and pass through a 0.5μm pore size filter membrane to obtain a thermal transfer ink.

[0053] Example 8

[0054] This embodiment provides a method for preparing thermal transfer ink, and the specific steps and parameters are as follows:

[0055] Take 40g of Disperse Red 60 color paste, 15g of ethylene glycol, 10g of 1,2-propylene glycol, 3g of high molecular weight polymer styrene acrylic copolymer, 3g of self-crosslinking agent acetoxy-modified acrylamide, 3g of sorbitol, 2g of surfactant polyether-modified trisiloxane, 0.3g of 1,2-benzisothiazol-3-one (BIT), and dilute to 100mL with deionized water, stir at 100rpm for 30min, and pass through a 0.5μm pore size filter membrane to obtain a thermal transfer ink.

[0056] Example 9

[0057] This embodiment provides a method for preparing thermal transfer ink, and the specific steps and parameters are as follows:

[0058] Take 20g of Disperse Red 60 color paste, 10g of ethylene glycol, 5g of 1,4-butanediol, 3g of high molecular polymer acrylic polymer, 3g of self-crosslinking agent acetoxy-modified acrylamide, 5g of sorbitol, 2g of surfactant, 0.1g of 1,2-benzisothiazol-3-one (BIT), and dilute to 100mL with deionized water, stir at 100rpm for 30min, and filter through a 0.5μm pore size filter membrane to obtain a thermal transfer ink.

[0059] Example 10

[0060] This embodiment provides a method for preparing a thermal transfer ink, and the specific steps and parameters are the same as those of Embodiment 1, except that the amount of sorbitol added is 2 g.

[0061] Embodiment 11

[0062] This embodiment provides a method for preparing a thermal transfer ink, and the specific steps and parameters are the same as those of Embodiment 1, except that the amount of sorbitol added is 6 g.

[0063] Example 12

[0064] This embodiment provides a method for preparing a thermal transfer ink. The specific steps and parameters are the same as those in Embodiment 1, except that the amount of high molecular weight polymer added is 4 g.

[0065] Comparative Example 1

[0066] This comparative example provides a method for preparing a thermal transfer ink, and the specific steps and parameters are the same as those in Example 1, except that no self-crosslinking agent is contained, that is,

[0067] Take 35g of Disperse Red 60 color paste, 10g of ethylene glycol, 10g of 1,2-propylene glycol, 1g of high molecular weight polymer styrene maleic anhydride copolymer, 4g of sorbitol, 1g of surfactant 2-ethoxy-1-ethynol, 0.2g of 1,2-benzisothiazol-3-one (BIT), and dilute to 100mL with deionized water, stir at 100rpm for 30min, and filter through a 0.5μm pore size filter membrane to obtain thermal transfer ink.

[0068] Comparative Example 2

[0069] This comparative example provides a method for preparing a thermal transfer ink, and the specific steps and parameters are the same as those of Example 2, except that no self-crosslinking agent is contained, that is,

[0070] Take 35g of Disperse Red 60 color paste, 10g of ethylene glycol, 10g of 1,2-propylene glycol, 3g of high molecular weight polymer styrene maleic anhydride copolymer, 4g of sorbitol, 1g of surfactant 2-ethoxy-1-ethynol, 0.2g of 1,2-benzisothiazol-3-one (BIT), and dilute to 100mL with deionized water, stir at 100rpm for 30min, and filter through a 0.5μm pore size filter membrane to obtain a thermal transfer ink.

[0071] Comparative Example 3

[0072] This comparative example provides a method for preparing a thermal transfer ink, and the specific steps and parameters are as follows:

[0073] Take 35g of Disperse Red 60 color paste, 12g of ethylene glycol, 12g of 1,2-propylene glycol, 1g of surfactant 2-ethoxy-1-ethynol, 0.2g of 1,2-benzisothiazol-3-one (BIT), and dilute to 100mL with deionized water, stir at 100rpm for 30min, and filter through a 0.5μm pore size filter membrane to obtain a thermal transfer ink.

[0074] Comparative Example 4

[0075] This comparative example provides a method for preparing a thermal transfer ink. The specific steps and parameters are the same as those of Example 1, except that an equal mass of acetylated modified acrylic acid (which can undergo a cross-linking reaction at 25-35° C.) is used to replace acetoxy modified acrylamide.

[0076] Comparative Example 5

[0077] This comparative example provides a method for preparing a thermal transfer ink, and the specific steps and parameters are the same as those of Example 1, except that the amount of the self-crosslinking agent used is 2 g.

[0078] Comparative Example 6

[0079] This comparative example provides a method for preparing a thermal transfer ink, and the specific steps and parameters are the same as those of Example 1, except that the amount of the self-crosslinking agent used is 6 g.

[0080] Application Example 1 to Application Example 18

[0081] The ink was proofed with a 100% pure color block on an EPSONI3200 nozzle printer, printed on 31g crane transfer paper, the drying temperature was set at 70°C, and then a 25-second transfer process was performed at 210°C to transfer the ink on the transfer paper to the polyester cloth to obtain a semi-finished fabric with printing.

[0082] Application Examples 1 to 18 are thermal transfer inks prepared from Examples 1-12 and Comparative Examples 1-6, respectively.

[0083] Application Example 19

[0084] The ink was proofed with a 100% pure color block on an EPSONI3200 nozzle printer, printed on 31g crane transfer paper, the drying temperature was set at 50°C, and then a transfer process was performed at 200°C for 25 seconds. The ink on the transfer paper was transferred to the polyester cloth to obtain a semi-finished fabric with printing.

[0085] The ink is the thermal transfer ink prepared in Example 1.

[0086] Application Example 20

[0087] The ink was proofed with a 100% pure color block on an EPSONI3200 nozzle printer, printed on 31g crane transfer paper, the drying temperature was set at 70°C, and then a 10-second transfer process was performed at 225°C to transfer the ink on the transfer paper to the polyester cloth to obtain a semi-finished fabric with printing.

[0088] The ink is the thermal transfer ink prepared in Example 1.

[0089] Experimental example

[0090] The semi-finished fabrics prepared in Application Examples 1 to 18 were tested for color migration fastness, clarity and moisture retention. The test results are shown in Table 1.

[0091] Testing method for color migration fastness:

[0092] The sample to be tested and the designated fabric are superimposed together to form a combined sample, and the combined sample is clamped between the resin plates of the perspiration color fastness tester, and a weight of 4.54 kg is applied on it, and the test frame of the perspiration color fastness tester is fixed. The test frame and a container containing at least 50 mL of distilled water are placed in a plastic bag and the bag is sealed. The entire bag is placed in a constant temperature box and maintained at 70±2℃ for 72 hours. The staining level of the multi-fiber lining or the designated fabric is evaluated with a gray sample card, which is the dye migration level.

[0093] The samples to be tested are the semi-finished fabrics prepared in Application Examples 1 to 18.

[0094] If the result is greater than or equal to level 4, it is judged as A; if the result is level 3-4, it is judged as B; if the result is less than level 3, it is judged as C.

[0095] Clarity test method:

[0096] On the semi-finished fabrics of test application examples 1 to 18, select the edge of the same color point and observe it with an electronic magnifying glass 10 times (recruit 50 volunteers to observe, and the result with the largest number of people is the final result).

[0097] Very clear with no bleeding edges, judged as A;

[0098] There is slight edge seepage, which is judged as B;

[0099] If the seepage is obvious or severe, it is judged as C.

[0100] Method for determining moisture retention:

[0101] To test the moisturizing performance of the ink on the print head, under the environmental conditions of temperature 30°C and humidity 40%, the thermal transfer inks prepared in Examples 1 to 12 and Comparative Examples 1 to 6 were loaded into a printer with an EPSON I3200 nozzle. When the nozzle was intact, the nozzle was moved out of the moisturizing position of the machine, and the nozzle was suspended in the air for a certain period of time, and then the nozzle status was tested.

[0102] Among them, the nozzle is intact for ≥30min, which is judged as A;

[0103] 20-30min nozzle is intact, judged as B;

[0104] 10-20min nozzle is intact, judged as C;

[0105] If the nozzle is intact for less than 10 minutes, it is judged as D.

[0106] Table 1 Printing performance test results

[0107]

[0108]

[0109] According to the measurement results in Table 1, it can be known that compared with Comparative Examples 1-6, Comparative Example 1-2 uses an ink without a cross-linking agent, Comparative Example 3, on the basis of not containing a cross-linking agent, does not contain an ink containing a high molecular polymer, Comparative Example 4 uses a cross-linking agent that undergoes cross-linking at room temperature, and Comparative Examples 5-6 use a technical solution with 2g and 6g of a self-cross-linking agent. The ink provided by the present invention not only performs well in color migration fastness, but also has good moisture retention and clarity.

[0110] Obviously, the above embodiments are merely examples for the purpose of clear explanation, and are not intended to limit the implementation methods. For those skilled in the art, other different forms of changes or modifications can be made based on the above description. It is not necessary and impossible to list all the implementation methods here. The obvious changes or modifications derived therefrom are still within the scope of protection of the invention.

Claims

1. A thermal transfer ink, characterized in that: The composition comprises the following components in parts by weight: Disperse dye paste 20-40 parts, 3-5 parts of self-crosslinking agent, The crosslinking temperature of the self-crosslinking agent is greater than or equal to 75°C.

2. The thermal transfer ink according to claim 1, characterized in that: The self-crosslinking agent includes acetoxy-modified acrylamide.

3. The thermal transfer ink according to claim 2, characterized in that: The thermal transfer ink further includes a surfactant, and the surfactant includes a nonionic surfactant.

4. The thermal transfer ink according to claim 3, characterized in that: The nonionic surfactant comprises at least one of acetylenic glycol ethoxylates, modified organic siloxanes, and polyether siloxane copolymers; and / or, The disperse dye in the disperse dye paste includes at least one of a low-temperature type and a medium-temperature type.

5. The thermal transfer ink according to claim 4, characterized in that: The thermal transfer ink further includes a co-solvent, and the co-solvent includes a polyol.

6. The thermal transfer ink according to claim 5, characterized in that: The thermal transfer ink further comprises a high molecular polymer, wherein the high molecular polymer comprises at least one of styrene maleic anhydride copolymer, styrene acrylic acid copolymer and acrylic acid polymer; and / or, The weight portion of the co-solvent is 15-25 parts; and / or, The polyol includes a diol having a molecular weight of 55-100.

7. The thermal transfer ink according to claim 6, characterized in that: The thermal transfer ink further comprises a moisturizer, wherein the moisturizer comprises sorbitol; and / or, The thermal transfer ink further comprises a bactericide, wherein the bactericide comprises 1,2-benzisothiazol-3-one; and / or, The weight portion of the high molecular weight polymer is 1-4 parts, preferably 1-3 parts; and / or, The polyol includes at least one of ethylene glycol, 1,2-propylene glycol, and 1,4-butanediol.

8. The thermal transfer ink according to claim 7, characterized in that: The weight portion of the moisturizing agent is 2-6 parts, preferably 3-5 parts; and / or, The weight portion of the bactericide is 0.1-0.3 parts.

9. Use of the thermal transfer ink according to any one of claims 1 to 8 in digital printing.

10. The use according to claim 9, characterized in that: The digital printing comprises the following steps: The printed pattern is printed onto the transfer paper through a nozzle, dried at 50-70℃, transferred at 200-225℃ for 10-25s, and the ink is transferred to the fabric.

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