Inkjet printing ink, inkjet printing process and inkjet printing device

Abstract

The invention discloses ink-jet printing ink, an ink-jet printing process and an ink-jet printing device. The inkjet printing ink comprises the following components in percentage by mass: 5-10% of pigment toner, 10-15% of a dispersing agent, 1-1.5% of urea, 1-2% of ethylene glycol, 10-15% of an adhesive, 0.1-1% of a penetrant, 0-0.5% of a surfactant, 0-0.5% of a pH regulator, 0-0.5% of a bactericide and the balance of deionized water. According to the ink-jet printing process provided by the invention, spraying parameters are accurately adjusted through the ink-jet printing device provided by the invention, and the ink-jet printing ink provided by the invention is reasonably used, so that printing on a textile presents a dirty dyeing effect with natural transition, rich layers and strong artistic feeling; the color fastness to washing and the color fastness to rubbing are relatively high.

Description

Technical Field

[0001] The present invention relates to the technical field of textile dyeing, and in particular to an inkjet printing ink, an inkjet printing process and an inkjet printing device. Background Art

[0002] With the continuous development of textile printing technology, inkjet printing has gradually gained attention due to its advantages such as high precision, personalization, and rich color gradation. However, existing inkjet printing technology still has certain limitations in achieving special textures and artistic effects. It is prone to problems such as hard edges and color distortion. In particular, it is difficult to achieve natural transitions and rich visual layers when simulating the effect of hand-stained dirty dyeing. Summary of the Invention

[0003] In order to solve the limitations of the above-mentioned existing inkjet printing technology in simulating the hand-made dirty dyeing effect, the present invention provides an inkjet printing process. The inkjet printing process uses the inkjet printing device provided by the present invention, accurately adjusts the spraying parameters, and reasonably uses the inkjet printing ink provided by the present invention to achieve a natural transition, rich layering, and artistic dirty dyeing effect on textiles, and has high water fastness and rubbing color fastness.

[0004] An inkjet printing device, which is used to spray the inkjet printing ink provided by the present invention on textiles,

[0005] The technical solution of the present invention is:

[0006] An inkjet printing ink, characterized in that it comprises the following components, calculated by mass percentage, 5-10% of coating toner, 10-15% of dispersant, 1-1.5% of urea, 1-2% of ethylene glycol, 10-15% of binder, 0.1-1% of penetrant, and the balance of deionized water;

[0007] Furthermore, it also includes 0-0.5% surfactant, 0-0.5% pH regulator and 0-0.5% bactericide in percentage by mass; the amount of the pH regulator is determined according to the pH of the inkjet printing ink, and the pH of the inkjet printing ink is adjusted to 6.5-8.5.

[0008] The addition of surfactants, pH regulators and fungicides prevents nozzle printing ink from deteriorating during long-term storage, improves the fluidity of the ink during spraying, avoids nozzle clogging, and increases the service life of the device and nozzle printing ink.

[0009] Furthermore, the mass ratio of the coating color powder to the dispersant is 1:(1-3); the coating color powder and the dispersant are compounded to ensure bright and stable colors, not easy to precipitate, and enhance the fluidity of the coating.

[0010] Furthermore, the mass ratio of the urea to the ethylene glycol is 1:(1-2); adjusting the compounding ratio of urea and ethylene glycol can adjust the wetting properties of the inkjet printing ink to enhance the penetration of the ink color so that it can diffuse more naturally on the textile surface.

[0011] Furthermore, the mass ratio of the penetrant to the adhesive is 1:(10-150); the combined use of the penetrant and the adhesive can effectively improve the adhesion of the inkjet printing ink, making the printing on the textile more durable and wear-resistant, while enhancing its penetration effect and making the color transition more natural.

[0012] Furthermore, the coating color powder includes but is not limited to one or more of Pigment Red 146, N-(4-chloro-2,5-dimethoxyphenyl)-3-hydroxy-4-[[2-methoxy-5-[((anilino)carbonyl]phenyl]azo]naphthalene-2-carboxamide, Permanent Yellow 74, 2-[(2-methoxy-4-nitrophenyl)azo]-N-(2-methoxyphenyl)-3-oxobutyramide, Pigment Blue 15:3, 29H,31H-phthalocyanine (2-)-N29,N30,N31,N32 copper complex, and carbon black.

[0013] Furthermore, the dispersant is MF-025.

[0014] Furthermore, the adhesive is HF-PD-1.

[0015] Furthermore, the penetrant is a polyhydroxy organic solvent, wherein the polyhydroxy organic solvent mixture includes one or more of isomeric alcohol ether phosphate (OEP-70) and dipropylene glycol butyl ether (DPNB).

[0016] Furthermore, the surfactant is one or more of fatty alcohol oxyethylene ether (AEO-9), nonionic surfactant, and gemini cationic surfactant;

[0017] Among the nonionic surfactants, octylphenol polyoxyethylene ether (TX-10) is preferred, and among the gemini cationic surfactants, Gemini surfactant 1227 is preferred.

[0018] Furthermore, the pH regulator is one or more of triethanolamine, citric acid, and sodium bicarbonate.

[0019] Furthermore, the fungicide is one or more of 1,2-benzisothiazolin-3-one (BIT), octylisothiazolinone (OIT), and dimethylhydroxymethylazetidine (DMDMH).

[0020] An inkjet printing process, characterized by comprising the following steps:

[0021] The textile to be printed and dyed is transported to the printing platform of the inkjet mechanism through the cloth feeding mechanism and is located below the nozzle. The inkjet printing ink as described in any of the above items is sprayed on the upper surface of the textile through the nozzle. After the spraying is completed, the textile is run through the cloth discharging mechanism into the drying mechanism for drying, and finally the textile is rolled up by the rolling mechanism;

[0022] The angle θ between the spray direction of the nozzle and the normal line of the fabric surface is 10°<θ<20°;

[0023] Unlike the prior art in which the nozzle is set at a right angle to the upper surface of the textile, the nozzle of the present invention is set at an angle relative to the textile surface, which can optimize the spray trajectory of the inkjet printing ink, make the color diffusion more layered, and achieve a dirty dyeing effect with a stronger sense of randomness and naturalness; when θ is too small (≤10°) or too large (≥20°), it may cause insufficient or excessive ink diffusion.

[0024] Furthermore: during spraying, the nozzle pressure P is 1<P<3MPa, the nozzle running speed S is 28000≤S≤30000PPS, and the nozzle aperture is 0.5-0.8mm;

[0025] Reasonable control of nozzle pressure and nozzle aperture can ensure the uniformity of inkjet printing ink spraying, so that the printing presents a natural gradient effect in different areas, avoiding hard edges or color distortion. When the nozzle pressure is too low (≤1MPa), the spraying effect is uneven, and when the nozzle pressure is too high (≥3MPa), inkjet printing ink splashing may occur.

[0026] The high-speed operation of the nozzle accurately reproduces complex textures, giving the print a more three-dimensional feel and enhancing the overall artistic expression. PPS stands for Pulses Per Second, which indicates the number of pulses generated per second. By adjusting PPS, the movement speed and positioning accuracy of the nozzle can be controlled.

[0027] Furthermore, the optimal nozzle angle, nozzle pressure, nozzle aperture and nozzle operating speed can be comprehensively selected according to different textile materials.

[0028] An inkjet printing device, characterized by comprising:

[0029] A cloth feeding mechanism, which is used to feed the textiles to be printed and dyed;

[0030] An inkjet mechanism for spraying inkjet printing ink onto the textile to be printed and dyed, so as to form a dirty dyeing effect on the textile, wherein the inkjet printing ink is the inkjet printing ink as described in any one of the above items;

[0031] The inkjet mechanism consists of an electrical control unit, an ink pump atomization unit, a spray gun unit, a printing platform, and an exhaust unit, wherein the angle θ between the nozzle in the spray gun unit and the normal line of the upper surface of the textile is 10°<θ<20°;

[0032] A cloth discharging mechanism, which is used to discharge the sprayed textiles;

[0033] Drying mechanism: the textiles unloaded by the cloth discharging mechanism enter the drying mechanism for drying;

[0034] The textiles dried by the oven mechanism are rolled up at the rolling mechanism.

[0035] The beneficial technical effects of the present invention are:

[0036] First: Optimize the structure of inkjet printing equipment to improve production stability;

[0037] The complete production process of cloth feeding mechanism, inkjet mechanism, cloth discharging mechanism, drying oven mechanism and winding mechanism is adopted to ensure the stability of cloth transportation during the inkjet printing process, which helps to improve the consistency and quality of the printing effect; the inkjet mechanism composed of electrical control unit, ink pump atomization unit, spray gun unit, printing platform and exhaust unit makes the spraying process more uniform, avoiding problems such as uneven color and hard boundaries.

[0038] Second, by adjusting the spraying parameters and rationally mixing special inkjet printing inks, on the one hand, precise control of the dirty dyeing effect is achieved, making the printing effect closer to the randomness and naturalness of the dirty dyeing effect in traditional processes; on the other hand, the water resistance, friction resistance and color fastness of the printing are improved, so that the product can maintain color stability during long-term use.

[0039] Third, the inkjet printing ink of the present invention is a water-soluble system, which avoids the pollution caused by the volatilization of organic solvents. It is suitable for infant clothing, home textiles, and artistic decorative fabrics, and is compatible with a variety of hydrophobic and hydrophilic fabrics such as polyester, nylon, cotton, linen, and silk. BRIEF DESCRIPTION OF THE DRAWINGS

[0040] Figure 1 1 is an overall schematic diagram of the inkjet printing device of the present invention;

[0041] Figure 2 Schematic diagram of the dirty dyeing effect of inkjet printing in Example 3 of the present invention.

[0042] Among them: 000-textile, 100-cloth feeding mechanism, 200-inkjet mechanism, 201-printing platform, 300-cloth discharging mechanism, 400-drying oven mechanism, 500-rolling mechanism. DETAILED DESCRIPTION

[0043] In order to more clearly understand the technical means of the present invention and implement it according to the contents of the specification, the specific implementation methods of the present invention are further described in detail below in conjunction with the drawings and examples. The following examples are used to illustrate the present invention but are not used to limit the scope of the present invention.

[0044] Unless otherwise specified, the materials, reagents, etc. used in the present invention can be obtained from commercial channels, for example: coating toners: Pigment Red 146, Permanent Yellow 74, Pigment Blue 15:3, Lily Group; carbon black, Hangzhou Zhihua New Materials; dispersant: MF-025, Shaoxing Mingxi Chemical; binder: HF-PD-1 digital printing coating ink special adhesive, Anhui Polyradiation Chemical; surfactants: AEO-9, TX-10, Gemini surfactant 1227, Xingtai Xinlanxing; textiles are conventional cotton fabrics that have not been pretreated.

[0045] The present invention provides an inkjet printing ink, comprising the following components by mass percentage: 5-10% coating toner, 10-15% dispersant, 1-1.5% urea, 1-2% ethylene glycol, 10-15% adhesive, 0.1-1% penetrant, 0-0.5% surfactant, 0-0.5% pH regulator, 0-0.5% fungicide, and the balance deionized water;

[0046] The coating color powder A used in the present invention includes, by mass percentage, the following components: color powder A: 740.4% of permanent yellow, 0.12% of pigment red 146, and 0.15% of carbon black.

[0047] Table 1 Inkjet printing ink formulas for Examples 1-6 and Comparative Examples 1-4

[0048]

[0049]

[0050] The present invention also provides an inkjet printing device and an inkjet printing process, which are compounded with the inkjet printing ink of the present invention to achieve a dirty dyeing effect on textiles.

[0051] The inkjet printing device of the present invention includes a cloth feeding mechanism, an inkjet mechanism, a cloth discharging mechanism, an oven mechanism and a rolling mechanism connected in sequence; wherein the inkjet mechanism is composed of an electrical control unit, an ink pump atomization unit, a spray gun unit, a printing platform, and an exhaust unit, and the angle θ between the spray direction of the nozzle in the spray gun unit and the normal line of the fabric surface is set to 10°<θ<20°.

[0052] The electrical control unit is used to precisely control the spraying process, thereby ensuring the stability of the spraying process; the ink pump atomization unit is used to improve the ink atomization quality and ensure the uniformity of the coating; the spray gun unit is used in conjunction with the printing platform for high-precision inkjet to ensure the artistic expression of the texture; the exhaust unit is used to control the ink drying speed to prevent uneven color blending.

[0053] The inkjet printing process of the present invention is as follows:

[0054] The textile to be printed and dyed is transported to the printing platform of the inkjet mechanism through the cloth feeding mechanism and is located below the nozzle. The inkjet printing ink of the present invention is sprayed on the upper surface of the textile through the nozzle. After the spraying is completed, the textile is run through the cloth discharging mechanism into the drying mechanism for drying, and finally the textile is rolled up by the rolling mechanism.

[0055] During spraying, the nozzle pressure is 1<P<3MPa, the nozzle running speed S is 28000≤S≤30000PPS, and the nozzle aperture is 0.5-0.8mm.

[0056] The main inkjet printing process parameters of the inks of Examples 1-6 and Comparative Examples 1-6 are shown in Table 2.

[0057] Table 2 Main inkjet printing process parameters of inks of Examples 1-6 and Comparative Examples 1-6

[0058]

[0059] The main inkjet printing process parameters of the comparative examples 7-12 inks are shown in Table 3, wherein the formula composition of the comparative examples 7-12 inks is the same as the formula composition of the ink of Example 3. The difference between comparative examples 7-12 and Example 3 is that the main inkjet printing process parameters used are different.

[0060] Table 3 Main inkjet printing process parameters of inks of comparative examples 7-12

[0061]

[0062]

[0063] The performance tests of Examples 1-6 and Comparative Examples 1-12 are as follows:

[0064] 1. Visual inspection: Visually observe whether the color diffusion effect of the printed pattern on the textile is natural and whether the inkjet printing ink is uniform and has no color difference.

[0065] 2. Washing fastness test: Select inkjet printed textiles and wash them in 40°C warm water with standard detergent for 30 minutes with agitation. Repeat the wash 30 times. Use a color fastness gray card to compare the color changes before and after washing. The color fastness that meets the water resistance standards of high-end textiles is ≥ Level 4.

[0066] 3. Friction fastness test: This includes dry friction color fastness grade and wet friction color fastness grade test. It uses 9N pressure and 60 reciprocating friction to test the color aging of the textile surface, and evaluates the friction fastness grade by gray card comparison.

[0067] 4. Environmental performance test: GC-MS is used to test VOC content.

[0068] 5. Production efficiency test: test the production speed and the qualified rate of textiles after inkjet printing.

[0069] Table 4 Performance test results of Examples 1-6 and Comparative Examples 1-12

[0070]

[0071]

[0072]

[0073] As can be seen from the test results in Table 4, the inkjet printing inks of Examples 1-6 have a uniform appearance without color difference. The color diffusion of the sprayed patterns is natural, without color unevenness or hard edges, making the printing effect closer to the randomness and naturalness of the dirty dyeing effect in traditional processes. After 30 washes, the water wash fastness is ≥ level 4, the dry rubbing color fastness is level 4-5, and the wet rubbing color fastness is level 4. The VOC content is low, meeting international environmental standards (OEKO-TEX 100), and is suitable for a variety of fabrics such as infant clothing, home textiles, and artistic decoration.

[0074] Comparative Examples 1-6 have the same inkjet printing process as Example 3, but the formulations of their inkjet printing inks are different, which leads to different problems in their test results, specifically:

[0075] Comparative Example 1-2 has an excessive or insufficient ratio of dispersant relative to the coating color powder, resulting in color difference or unevenness in the appearance of the ink, which further causes the inkjet printing pattern to have excessive or poor diffusion. In addition, the water washing fastness, dry friction color fastness, wet friction color fastness and the qualified rate of the finished products of both are worse than those of Examples 1-6.

[0076] In Comparative Examples 3-4, due to the excessive or insufficient ratio of urea to ethylene glycol, the wettability of the ink and the penetration of the ink color during inkjet printing are poor, which further leads to uneven diffusion and poor diffusion of the inkjet printing pattern, and also makes its water washing fastness, dry friction color fastness, wet friction color fastness and the qualified rate of its finished product low.

[0077] In Comparative Examples 5-6, the amount of adhesive or penetrant added is not within the formula composition range of the ink of this application, which directly leads to the ink not adhering firmly to the surface of the textile, and is easy to peel off and fade, resulting in poor corresponding water washing fastness, dry friction color fastness, and wet friction color fastness.

[0078] The formulations of the inks in Comparative Examples 7-12 are the same as those in Example 3. However, the main inkjet printing process parameters used in Comparative Examples 7-12 and Example 3 are different, which leads to different problems in their test results, specifically:

[0079] When the nozzle θ of Comparative Examples 7-8 is too small (≤10°) or too large (≥20°), it is easy to cause insufficient ink diffusion or excessive ink diffusion, which directly reduces the final qualified rate. When the nozzle pressure of Comparative Examples 9-10 is too low (≤1MPa) or too high (≥3MPa), it is easy to cause insufficient diffusion or excessive diffusion, which reduces the final qualified rate and also reduces its water washing fastness, dry friction color fastness, and wet friction color fastness; the nozzle θ of Comparative Example 11 is 0°, which is a conventional setting in the prior art. The nozzle is perpendicular to the textile surface, and the dirty dyeing effect produced by its inkjet printing is poor, and obvious color block accumulation occurs. When the nozzle θ of Comparative Example 12 is 0°, the nozzle running speed S is also slow, which makes its inkjet printing pattern have more obvious color block accumulation and stiff pattern edge lines, which directly reduces the production rate and qualified rate. At the same time, the water washing and friction resistance are unstable due to color block accumulation.

[0080] In another embodiment, the inkjet printing process of the present application is also applicable to:

[0081] Multi-layer spray coating process, including:

[0082] 1) Using multi-layer spraying technology, that is, spraying light colors first, and then gradually deepening the color concentration in local areas to achieve a more natural gradient dirty dyeing effect; 2) Using a dual-nozzle system, different nozzles apply ink of different concentrations, making the color diffusion more natural.

[0083] In another embodiment, the inkjet printing process of the present application is also applicable to:

[0084] Digital inkjet is combined with manual melting technology, specifically including: the use of basic inkjet printing technology and manual brush dyeing process, which is suitable for high-end markets or personalized customization. Its production efficiency is low, but it can achieve a more personalized natural dirty dyeing effect.

[0085] In another embodiment, the inkjet printing process of the present application is also applicable to:

[0086] The intelligent AI inkjet control process specifically includes: combining with the AI vision system to automatically detect the fiber density of each piece of cloth, intelligently adjust the inkjet volume, so that the ink combines with the characteristics of the cloth and the color diffusion is more even.

[0087] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the technical principles of the present invention. These improvements and modifications should also be regarded as the scope of protection of the present invention.

Claims

1. An inkjet printing ink, characterized in that The invention comprises the following components in percentage by mass: 5-10% of coating color powder, 10-15% of dispersant, 1-1.5% of urea, 1-2% of ethylene glycol, 10-15% of adhesive, 0.1-1% of penetrant, and the balance of deionized water.

2. The inkjet printing ink according to claim 1, characterized in that The invention also comprises, by mass percentage, 0-0.5% of a surfactant, 0-0.5% of a pH regulator and 0-0.5% of a bactericide.

3. The inkjet printing ink according to claim 1, characterized in that The mass ratio of the coating color powder to the dispersant is 1:(1-3).

4. The inkjet printing ink according to claim 1, characterized in that The mass ratio of the urea to the ethylene glycol is 1:(1-2).

5. The inkjet printing ink according to claim 1, characterized in that The mass ratio of the penetrant to the adhesive is 1:(10-150).

6. The inkjet printing ink according to claim 1, characterized in that The penetrant is one or more polyhydroxy organic solvents.

7. An inkjet printing process, characterized in that: Including the following steps: The textile to be printed and dyed is transported to the printing platform of the inkjet mechanism through the cloth feeding mechanism and is located below the nozzle. The inkjet printing ink according to any one of claims 1 to 6 is sprayed on the upper surface of the textile through the nozzle. After the spraying is completed, the textile is run through the cloth discharging mechanism into the drying mechanism for drying, and finally the textile is rolled up by the rolling mechanism; The angle θ between the nozzle and the normal line of the upper surface of the textile is 10°<θ<20°.

8. The inkjet printing process according to claim 7, characterized in that: During spraying, the nozzle pressure P is 1<P<3MPa, the nozzle running speed S is 28000≤S≤30000PPS, and the nozzle aperture is 0.5-0.8mm.

9. An inkjet printing device, characterized in that include, A cloth feeding mechanism, which is used to feed the textiles to be printed and dyed; An inkjet mechanism for spraying inkjet printing ink onto the textile to be printed and dyed, so as to form a dirty dyeing effect on the textile, wherein the inkjet printing ink is the inkjet printing ink according to any one of claims 1 to 6; The inkjet mechanism consists of an electrical control unit, an ink pump atomization unit, a spray gun unit, a printing platform, and an exhaust unit, wherein the angle θ between the spray direction of the nozzle in the spray gun unit and the normal line of the fabric surface is 10°<θ<20°; A cloth discharging mechanism, which is used to discharge the sprayed textiles; Drying mechanism: the textiles unloaded by the cloth discharging mechanism enter the drying mechanism for drying; The textiles dried by the oven mechanism are rolled up at the rolling mechanism.

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