Sublimation ink composition for ink-jet printing and preparation method of sublimation ink composition

Abstract

The invention relates to a sublimation ink composition for ink-jet printing and a preparation method thereof. The sublimation ink composition for ink-jet printing comprises the following components: color paste, a humectant, organosilicon polyether, an auxiliary agent and water, the color paste is prepared from the following components in percentage by mass: 10 to 30 percent of disperse dye, 15 to 25 percent of dispersing agent and 45 to 70 percent of mixed solvent; wherein the dispersing agent is obtained by reaction of graphene, vinyl anthraquinone, vinyl pyrrolidone, acrylic acid, styrene, hydroxyl alkyl acrylate and amino polyether. The specific dispersing agent and the disperse dye are compounded to obtain the color paste, and then the color paste is further mixed with other components to obtain the thermal sublimation ink composition, so that the dispersion effect of the dye is improved, the fluency of the ink is improved, and the fastness and penetration depth after printing are effectively improved; the dye sublimation ink has important significance on further development and popularization of the dye sublimation ink.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of ink technology, in particular to a sublimation ink composition for inkjet printing and a preparation method thereof. BACKGROUND

[0002] The traditional printing process adopts a screen printing color matching method, which is complex, prone to errors, long in process, high in cost, produces a large amount of printing and dyeing wastewater, and is difficult to handle. The digital sublimation transfer printing technology has the advantages of high precision, personalization, low energy consumption, and no wastewater discharge, and is a new printing and dyeing technology.

[0003] Sublimation ink is a special ink used for heat transfer printing process, mainly composed of disperse dyes, solvents and additives. At a high temperature of 180-220℃, the dye sublimates into a gaseous state and penetrates into the substrate, forming a pattern with bright color, washing and wear resistance. Its advantages include high color reproduction, washing resistance, ultraviolet resistance, no heavy metals, etc., so it is more durable and safer and more environmentally friendly, and is widely used in the fields of textiles, hard materials and digital printing, especially suitable for small batch customized production.

[0004] However, the current sublimation ink products still have many technical bottlenecks in practical application, the most prominent problems of which are concentrated in the following aspects: first, the color fastness of dark color ink is poor, especially in the sublimation transfer printing process at high temperature and high pressure, color fading, color migration and other phenomena are prone to occur, which seriously affects the durability and color reproduction of the printed product; second, the high concentration of ink disperse dyes has many particles and a large color base ratio, and the formula has obvious rheological defects, so the layering and flow are not good, resulting in flow problems such as broken lines and flying ink in the printing process, which directly affects the printing quality and production efficiency; more seriously, due to the presence of moisturizing agents and slow-drying solvents in the mixed solvents, small bubbles are generated on the printed paper during the high-temperature sublimation stage, and the small bubbles in the dye will appear white spot defects when transferred to the substrate. In addition, the penetration depth of the existing ink is generally insufficient, and it is difficult to fully soak the fiber pores of the transfer cloth, resulting in a big discount in the clarity and color saturation of the transferred pattern. These problems have become key factors restricting the development of sublimation printing technology, and need to be optimized systematically from the chemical composition of the ink, the printing process parameters and the matching of the equipment.

[0005] Therefore, it is urgent to develop a new technical scheme to solve the problems in the prior art. SUMMARY

[0006] Based on this, the present application provides a kind of inkjet printing sublimation ink composition and its preparation method, the present application obtains color paste by specific dispersant and dispersing dye complex, then further mixed with other components to obtain sublimation ink composition, not only improve the dispersion effect of dye, improve the fluency of ink, also effectively improve the fastness and penetration depth after printing, it has important significance for the further development and promotion of sublimation ink.

[0007] The present application aims to provide a kind of inkjet printing sublimation ink composition, the inkjet printing sublimation ink composition includes the following components by mass fraction:

[0008]

[0009] The color paste includes the following components by mass fraction:

[0010] Disperse dye 10-30%

[0011] Dispersant 15-25%

[0012] Mixed solvent 45-70%;

[0013] Wherein, the dispersant is the reaction product of graphene, vinyl anthraquinone, vinyl pyrrolidone, acrylic acid, styrene, hydroxyalkyl acrylate and amino polyether.

[0014] Further, the mixed solvent includes glycerol, propylene glycol methyl ether, propylene glycol and water.

[0015] Further, the mass ratio of glycerol, propylene glycol methyl ether, propylene glycol and water is (2-6):(0.5-2):(5-10):(35-60).

[0016] Further, the humectant is selected from one or more of glycerol, triethylene glycol butyl ether and propylene glycol.

[0017] Further, the amino polyether is selected from one or more of terminal amino polyoxyethylene ether and terminal amino polyoxyethylene / polyoxypropylene ether.

[0018] Further, the auxiliary agent is selected from one or more of surface tension regulator, bactericide, pH regulator, defoaming agent and leveling agent.

[0019] Further, the dispersing dye is selected from one or more of disperse red dye, disperse yellow dye and disperse blue dye.

[0020] Another object of the present application is to provide the above-mentioned inkjet printing sublimation ink composition, and the preparation method of the dispersant comprises the following steps:

[0021] S1, mixing graphene, vinyl anthraquinone, vinyl pyrrolidone, acrylic acid, styrene, hydroxy alkyl acrylate and initiator, heating and reacting under inert gas protection to obtain an intermediate product;

[0022] S2, mixing the intermediate product and amino polyether, heating and reacting to obtain the dispersant.

[0023] Further, the graphene is double bond modified graphene.

[0024] Further, the mass ratio of the graphene, vinyl anthraquinone, vinyl pyrrolidone, acrylic acid, styrene, hydroxy alkyl acrylate is (0.1-0.5):(0.1-1):(0.5-2):(1-2):(1-3):(1-3).

[0025] Further, the mass ratio of the intermediate product and amino polyether is 1:(0.5-2).

[0026] The present application has the following beneficial effects:

[0027] The present application uses graphene, vinyl anthraquinone, vinyl pyrrolidone, acrylic acid, styrene, hydroxy alkyl acrylate and amino polyether to copolymerize to obtain a dispersant. The components have anthraquinone, benzene ring groups and graphene with a cyclic structure on one hand, so they can adsorb and anchor various pigment molecules through electrostatic action and π-π bond, and form steric hindrance through hydrophilic polyether segments to prevent the aggregation and sedimentation of microparticles in the aqueous system, thereby ensuring the stability of the color paste.

[0028] After mixing the color paste with other components to obtain an ink, different components can be uniformly dispersed in the composition under the action of the dispersant, thereby enhancing the uniformity of the product and ensuring that the ink has good flowability at high concentrations. At the same time, various hydrophilic and lipophilic groups also endow the formula with amphiphilic characteristics, which is beneficial to improve the wetting effect and improve the permeability of the ink on the surface of the fabric during the heat pressing process, thereby achieving better printing effect. In addition, the pyrrolidone group, polyether long chain introduced by the dispersant and the organic silicone polyether in the ink can form a synergistic effect to reduce the surface tension of the formula, not only promote the stability of the composition, but also effectively avoid the possibility of generating a large amount of bubbles at high temperature after being combined with graphene oxide with high specific surface area and high thermal conductivity, and further enhance the wetting and permeability effect, thereby enhancing the fastness after transfer printing and endowing the product with better printing precision. BRIEF DESCRIPTION OF DRAWINGS

[0029] Figure 1 A scanning electron microscope image of the inkjet printing sublimation ink composition prepared by the embodiment 1 of the present application is shown. DETAILED DESCRIPTION

[0030] In order to more clearly illustrate the technical solutions of the present application, the following examples are listed. The raw materials, reactions and post-processing methods appearing in the examples are all common raw materials on the market and technical means well known to those skilled in the art, unless otherwise stated.

[0031] The words "preferred", "preferably", "more preferred", etc. in the present application refer to embodiments of the present application that can provide certain benefits in certain situations. However, other embodiments can also be preferred in the same or other situations. In addition, the description of one or more preferred embodiments does not imply that other embodiments are not useful, nor does it imply that these embodiments are the only ones deemed useful.

[0032] It should be understood that, except in any operating examples, or where otherwise indicated, expressions of amount or all numbers expressing quantities of ingredients, reaction conditions, and so forth used in the specification and claims are understood as being modified in all instances by the term "about". Thus, unless expressly recited otherwise, the numerical parameters set forth in the following description and attached claims are approximations that can vary depending upon the desired properties sought to be obtained in light of the present disclosure.

[0033] The Disperse Yellow (54) dye, Disperse Blue (360) dye and Disperse Red (60) dye in the embodiments of the present application are purchased from Yaban Company.

[0034] The organosilicon polyether in the embodiments of the present application is PEG-12 dimethicone with a brand of Dow Corning OFX-0193.

[0035] The bactericide in the embodiments of the present application is GXL bactericide.

[0036] The surface tension regulator in the embodiments of the present application is TRITON X-45.

[0037] The graphene oxide in the embodiments of the present application is purchased from Changzhou Sixth Element Company, with a model of SE2431.

[0038] The amino polyether in the embodiments of the present application is polyether amine ED-600.

[0039] The preparation method of the dispersant 1 in the embodiments of the present application includes the following steps:

[0040] S1, water and ethanol with a mass ratio of 1:9 are used as solvents, silane coupling agent KH570 and graphene oxide with a mass ratio of 3:1 are added, ultrasonic dispersion is carried out for 10 min, then glacial acetic acid is added to adjust the pH to 5.5, 70℃ reaction is carried out for 6h, and after washing and drying, double bond modified graphene is obtained;

[0041] The double bond modified graphene, 2-vinyl anthraquinone, N-vinyl pyrrolidone, methacrylic acid, styrene, hydroxypropyl acrylate and benzoyl peroxide with a mass ratio of 0.5:0.5:0.7:1:2.5:1.5:0.06 are mixed as a solvent, toluene, stirred at 90 DEG C under nitrogen protection for 5h, and the intermediate product is obtained after removing the solvent and drying.

[0042] S2, the intermediate product and amino polyether with a mass ratio of 1:1 are mixed, and the dispersant 1 is obtained after reaction at 180 DEG C for 6h.

[0043] The preparation method of the dispersant 2 in the embodiment of the application comprises the following steps:

[0044] S1, water and ethanol with a mass ratio of 1:9 are used as a solvent, silane coupling agent KH570 and graphene oxide with a mass ratio of 3:1 are added, ultrasonic dispersion is carried out for 10min, then glacial acetic acid is added to adjust the pH to 5.5, reaction is carried out at 70 DEG C for 6h, and the double bond modified graphene is obtained after washing and drying;

[0045] The double bond modified graphene, 2-vinyl anthraquinone, N-vinyl pyrrolidone, methacrylic acid, styrene, hydroxypropyl acrylate and benzoyl peroxide with a mass ratio of 0.5:0.5:0.7:1:2.5:1.5:0.06 are mixed as a solvent, toluene, stirred at 90 DEG C under nitrogen protection for 5h, and the intermediate product is obtained after removing the solvent and drying;

[0046] S2, the intermediate product and amino polyether with a mass ratio of 1:1.2 are mixed, and the dispersant 2 is obtained after reaction at 180 DEG C for 6h.

[0047] Example 1

[0048] A kind of for ink-jet printing thermal dye ink composition, the for ink-jet printing thermal dye ink composition includes the following components with mass fraction:

[0049]

[0050]

[0051] The colorant includes the following components with mass fraction:

[0052]

[0053] The preparation method of the for ink-jet printing thermal dye ink composition comprises the following steps:

[0054] The dispersing dye, dispersing agent 1 and alcohol ether solvent are mixed in the above mass fraction, stirred uniformly, and ground to a particle size of less than 120 nm to obtain a color paste; then the color paste and other components are mixed uniformly, ground, and then passed through 1 μm and 0.45 μm filter membranes in sequence to obtain the inkjet printing sublimation ink composition.

[0055] Figure 1 A scanning electron microscope image of the inkjet printing sublimation ink composition prepared in Example 1 of the present application is shown.

[0056] Example 2

[0057] An inkjet printing sublimation ink composition includes the following components in the mass fraction:

[0058]

[0059] The color paste includes the following components in the mass fraction:

[0060]

[0061]

[0062] A preparation method of the inkjet printing sublimation ink composition includes the following steps:

[0063] The dispersing dye, dispersing agent 1 and alcohol ether solvent are mixed in the above mass fraction, stirred uniformly, and ground to a particle size of less than 120 nm to obtain a color paste; then the color paste and other components are mixed uniformly, ground, and then passed through 1 μm and 0.45 μm filter membranes in sequence to obtain the inkjet printing sublimation ink composition.

[0064] Example 3

[0065] An inkjet printing sublimation ink composition includes the following components in the mass fraction:

[0066]

[0067] The color paste includes the following components in the mass fraction:

[0068]

[0069] A preparation method of the inkjet printing sublimation ink composition includes the following steps:

[0070] The dispersing dye, dispersant 2 and alcohol ether solvent were mixed in the above mass fraction, stirred uniformly, and ground to a particle size of less than 120 nm to obtain a color paste; then the color paste and other components were mixed uniformly, ground, and then passed through 1 μm and 0.45 μm filter membranes in sequence to obtain the inkjet printing sublimation ink composition.

[0071] Comparative Example 1

[0072] The difference between this comparative example and Example 2 is that in the preparation method of the dispersant, step S1 is modified as follows:

[0073] S1, toluene was used as a solvent, and 2-vinylanthraquinone, N-vinylpyrrolidone, methacrylic acid, styrene, hydroxypropyl acrylate and benzoyl peroxide were mixed in a mass ratio of 0.5:0.7:1:2.5:1.5:0.06, and stirred at 90°C for 5h under nitrogen protection, and then the solvent was removed and dried to obtain an intermediate product;

[0074] The other components and preparation methods are the same as those of Example 2.

[0075] Comparative Example 2

[0076] The difference between this comparative example and Example 2 is that in the preparation method of the dispersant, step S1 is modified as follows:

[0077] S1, water and ethanol were used as solvents in a mass ratio of 1:9, silane coupling agent KH570 and graphene oxide were added in a mass ratio of 3:1, ultrasonic dispersion was performed for 10 min, then glacial acetic acid was added to adjust the pH to 5.5, and reaction was performed at 70°C for 6h, and then the product was washed and dried to obtain double bond modified graphene;

[0078] Toluene was used as a solvent, and the double bond modified graphene, 2-vinylanthraquinone, methacrylic acid, styrene, hydroxypropyl acrylate and benzoyl peroxide were mixed in a mass ratio of 0.5:0.5:1:2.5:1.5:0.06, and stirred at 90°C for 5h under nitrogen protection, and then the solvent was removed and dried to obtain an intermediate product;

[0079] The organosilicon polyether was replaced by glycerol;

[0080] The other components and preparation methods are the same as those of Example 2.

[0081] Test Example

[0082] Test Method:

[0083] Stability Test: The sublimation ink composition samples prepared in the examples and comparative examples were respectively sealed and stored in transparent containers, and then placed at room temperature for six months, and then observed whether there was precipitation or layering.

[0084] Fluency test: Use an EPSON inkjet printer to print full-width, print the sublimation ink composition sample onto transfer paper, print continuously for 2000m at a speed of 5m / min, and check whether each sample has line breakage;

[0085] Then seal the ink cartridge opening with transparent tape, place the inkjet head downward into the container without touching the bottom of the container, store it at room temperature for 15 days, then take it out and perform a printing test using the same method to observe whether there is any breakage or blockage.

[0086] Color fastness test: A heat press was used to transfer the sublimation ink composition sample from transfer paper onto cotton fabric (transfer temperature 210°C, time 8 seconds). The color fastness to soaping was then tested according to the method specified in GB / T 3921-2008 (washing conditions: 50°C, 45 minutes).

[0087] Color density test: X-rite I5 colorimeter is used for testing.

[0088] The test results are shown in Table 1.

[0089] Table 1 Test results

[0090] Sample Stability Flow Intermittent flow Color fastness Color density Example 1 No delamination, precipitation No breakage No breakage or clogging 4-5 1.35 Example 2 No delamination, precipitation No breakage No breakage or clogging 4-5 1.53 Example 3 No delamination, precipitation No breakage No breakage or clogging 4 1.46 Comparative Example 1 No delamination, precipitation No breakage Breakage occurred 3 1.44 Comparative Example 2 No delamination, precipitation No breakage Breakage occurred 3 1.37

[0091] According to the above test results, it can be seen that the thermal sublimation ink composition for inkjet printing prepared in Examples 1-3 has excellent comprehensive performance, remains stable after long-term storage, and has good printing effect, without line breakage, clogging, etc. After the ink is transferred to the fabric, both dark and light colors have good color fastness and color density; while Comparative Examples 1-2 replace the dispersant and silicone polyether components, which, on the one hand, leads to reduced dispersion and stabilization effects of the composition, resulting in delamination and easy line breakage, and on the other hand, causes the composition to easily generate bubbles at high temperatures, and at the same time, the permeability is reduced, resulting in reduced color fastness and color density of the transfer, and the overall performance is not ideal.

[0092] It will be apparent to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above and that the invention can be embodied in other specific forms without departing from the spirit or essential characteristics of the invention. Therefore, the embodiments should be considered in all respects as illustrative and non-restrictive, and the scope of the invention is defined by the appended claims rather than the foregoing description, and it is intended that all variations that come within the meaning and range of equivalents of the claims be embraced therein.

[0093] Furthermore, it should be understood that although the specification is described in terms of embodiments, not every embodiment includes every feature or implementation described herein. The specification can include implicit combinations of explicitly mentioned features and / or implicit combinations of implicitly mentioned features. Such combinations are also expressly included within the scope of the specification and an embodiment.

Claims

1. A thermal sublimation ink composition for inkjet printing, characterized in that, The thermal sublimation ink composition for inkjet printing comprises the following components in mass fraction: The color paste includes the following components by mass fraction: Disperse dyes 10-30% Dispersant 15-25% Mixed solvent 45-70%; The dispersant is obtained by reacting graphene, vinyl anthraquinone, vinyl pyrrolidone, acrylic acid, styrene, hydroxyalkyl acrylate and amino polyether.

2. The thermal sublimation ink composition for inkjet printing according to claim 1, characterized in that: The mixed solvent includes glycerin, propylene glycol methyl ether, propylene glycol and water.

3. The thermal sublimation ink composition for inkjet printing according to claim 2, characterized in that: The mass ratio of the glycerol, propylene glycol methyl ether, propylene glycol and water is (2-6):(0.5-2):(5-10):(35-60).

4. The thermal sublimation ink composition for inkjet printing according to claim 1, characterized in that: The moisturizing agent is selected from one or more of glycerin, triethylene glycol butyl ether, and propylene glycol.

5. The thermal sublimation ink composition for inkjet printing according to claim 1, characterized in that: The amino polyether is selected from one or more of amino-terminated polyoxyethylene ether and amino-terminated polyoxyethylene / polyoxypropylene ether.

6. The thermal sublimation ink composition for inkjet printing according to claim 1, characterized in that: The auxiliary agent is selected from one or more of a surface tension regulator, a bactericide, a pH regulator, a defoamer, and a leveling agent.

7. The thermal sublimation ink composition for inkjet printing according to claim 1, characterized in that: The preparation method of the dispersant comprises the following steps: S1, mixing graphene, vinyl anthraquinone, vinyl pyrrolidone, acrylic acid, styrene, hydroxyalkyl acrylate and an initiator, and heating the mixture under inert gas protection to obtain an intermediate product; S2. Mixing the intermediate product and amino polyether, heating and reacting the mixture to obtain the dispersant.

8. The thermal sublimation ink composition for inkjet printing according to claim 7, characterized in that: The graphene is double-bond modified graphene.

9. The thermal sublimation ink composition for inkjet printing according to claim 7, characterized in that: The mass ratio of the graphene, vinyl anthraquinone, vinyl pyrrolidone, acrylic acid, styrene and hydroxyalkyl acrylate is (0.1-0.5):(0.1-1):(0.5-2):(1-2):(1-3):(1-3).

10. The thermal sublimation ink composition for inkjet printing according to claim 7, characterized in that: The mass ratio of the intermediate product to the amino polyether is 1:(0.5-2).

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