Digital pyrography ink suitable for household printer and preparation method and application thereof

Abstract

The invention relates to digital pyrography ink suitable for a household printer and a preparation method and application thereof, the digital pyrography ink suitable for the household printer comprises the following raw materials: resin, an organic solvent, polyether co-modified silicone oil, water, a coloring agent and oleic acid dipolyglycerol ester, and the resin is waterborne polyurethane. The invention further discloses a preparation method and application of the digital pyrography ink suitable for the household printer. The hot melt adhesive powder or the white hot melt adhesive paper is used for transfer printing under the condition that a printer is not modified, the printer is not blocked by the ink during sealing, and the ink has excellent continuous spraying and printing performance, long-term degradation performance and good washing fastness, patterns are bright and uniform in color, and a formed film is soft and elastic.

Description

Technical Field

[0001] The invention relates to ink and a preparation method and application thereof, and in particular to a digital heat transfer ink suitable for printing with a home printer and a preparation method and application thereof. Background Art

[0002] With the continuous development of digital printing, digital heat transfer ink has become a new type of printing product. It has interesting and DIY features and is deeply loved by relevant enthusiasts. Due to the special order of digital heat transfer ink, the heat transfer printer needs to first print red, yellow, blue and black inks on the heat transfer release film, and then start printing white ink. First, it plays a role as a lining color, and second, it can receive red, yellow, blue and black ink drops and hot melt adhesive powder to transfer to the substrate. Ordinary household six-color printers need to modify the ink cartridge and printing program to use this ink, and the use of white ink can easily cause clogging problems, which greatly increases the threshold for use and increases the customer's consumption items, which is not conducive to promotion and use. Summary of the invention

[0003] The technical problem to be solved by the present invention is to overcome the shortcomings of the prior art, especially to solve the problem that the printing method of digital heat transfer ink cannot be adapted to the printing program of ordinary household printers and that white ink easily causes clogging. A digital heat transfer ink suitable for household printers and a preparation method and application thereof are provided. The digital heat transfer ink can be adapted to household printers and does not require white ink, thereby avoiding the problem of white ink clogging.

[0004] The technical solution adopted by the present invention to solve the technical problem is as follows:

[0005] The digital heat transfer ink suitable for home printers of the present invention comprises raw materials including resin, organic solvent, polyether co-modified silicone oil, water, colorant and oleic acid dipolyglycerol ester, wherein the resin is water-based polyurethane.

[0006] The water is preferably deionized water to prevent the trace impurities in the water from reacting with certain components to produce tiny precipitation that may clog the nozzle. The amount of water used is determined by viscosity and surface tension.

[0007] The waterborne polyurethane is a self-crosslinking waterborne polyurethane dispersion.

[0008] The self-crosslinking ability of waterborne polyurethane dispersion is utilized to form a uniform crosslinking network to ensure uniform color of the pattern. The waterborne polyurethane fixes the pattern and provides excellent tensile properties and flexibility. The self-crosslinking waterborne polyurethane dispersion plays a crosslinking role in the ink system and forms a crosslinking network with colorants, etc., which can improve the uniformity of the color of the pattern. It does not require white ink to be taken up, but is directly compounded with hot melt adhesive to form a pattern film layer that is resistant to water washing, color fastness and strong in tensile strength. By adding oleic acid dipolyglycerol to the ink formula, it plays a moisturizing and hygroscopic role, ensures that the ink does not lose water, and inhibits the self-crosslinking of the resin. Oleic acid dipolyglycerol improves the curing phenomenon of the ink in a sealed environment, prevents the ink from curing and clogging the nozzle, and improves the time-degradation performance of the ink. The polyether co-modified silicone oil plays a defoaming and anti-foaming role, which will inhibit the generation of microbubbles in the ink nozzle, prevent the printing line from being broken due to bubbles during the printing process, and improve the continuous printing performance of the ink.

[0009] Further, in parts by mass, based on 100 parts by total weight, the raw materials include:

[0010]

[0011] Furthermore, the colorant is a dispersed color paste or a color type.

[0012] Furthermore, the organic solvent is at least one of propylene glycol, glycerol, ethylene glycol, and glycerol.

[0013] A further solution is a digital heat transfer ink suitable for home printers, the viscosity of the ink is 5cp to 11cp, and the surface tension is 30mN / m to 42mN / m. Further, the particle size of the solid particles of the digital heat transfer ink suitable for home printers is ≤250nm. If the particle size of the solid particles is too large, the ink will agglomerate and clog the nozzle.

[0014] Studies have shown that by controlling the viscosity, surface tension and solid particle size of the ink, the digital heat transfer ink of the present invention can be normally sprayed when applied to a home printer. If the viscosity of the ink is too high, the home printer will not be able to spray the ink. If the surface tension is too low, bleeding will occur during inkjet printing, and if the surface tension is too high, the ink cannot be sprayed.

[0015] A further solution is a digital heat transfer ink suitable for home printers, and its preparation method comprises the following steps: adding water, organic solvent, oleic acid dipolyglycerol ester and self-crosslinking aqueous polyurethane dispersion in proportion, stirring evenly, and then adding colorant and polyether co-modified silicone oil in order, adjusting the pH to 6-9, filtering through a 200-mesh to 300-mesh sieve to obtain the digital heat transfer ink suitable for home printers.

[0016] In the preparation method of the present invention, each component is added in sequence and twice in order to make the organic solvent dissolve better on the basis of the water phase and avoid problems such as agglomeration caused by excessive local concentration. After the water, organic solvent, oleic acid dipolyglycerol ester and self-crosslinking waterborne polyurethane dispersion are added for the first time, they are stirred evenly to make the system initially stable, and then the subsequent components of colorant and polyether co-modified silicone oil are added to better disperse and color. If each component is added at the same time, the ink may cause problems such as agglomeration due to excessive local concentration, which will inevitably affect the printing effect.

[0017] Furthermore, the pH is preferably adjusted with a buffer pair, such as a citric acid-sodium citrate buffer pair, which can keep the system pH relatively stable under certain time and conditions. This prevents the ink from corroding the nozzle and ink path system, ensuring the quality and consistency of the printing effect. If the system pH is too high or too low, it will increase the risk of corrosion to the printer's inkjet system. Screen filtration is to control the particle size and screen out solid particles such as impurities, hair, and dust.

[0018] The digital heat transfer ink suitable for home printers of the present invention meets the industry standard: the color difference value △E≤3 between a monochrome printed image and a monochrome filled printed image in the CMKY mode of professional drawing software.

[0019] The application of digital heat transfer ink suitable for home printers of the present invention, that is, its transfer method, the first method is to print the ink on the heat transfer release film through the home printer, evenly sprinkle hot melt adhesive powder, and then bake the hot melt adhesive powder to a molten state (preferably 160-180℃ for 2-5min), and then heat press it onto the white substrate. Another method is to print the ink on the heat transfer release film through the home printer, and then cover the pattern surface on the white hot melt adhesive transfer film, press (preferably press at 160-180℃ for 2-5min) and then tear it off, so that the pattern is stained with white hot melt adhesive, and then the transfer layer of the heat transfer release film is facing the colored printing substrate, and hot pressing (preferably the hot pressing temperature is 155-160℃, and the hot pressing is 20-30s), and then the heat transfer is completed.

[0020] A further solution is that the white hot melt adhesive transfer film is preferably coated with a thermoplastic elastic plastic composition. The thermoplastic elastic plastic composition comprises the following components by weight based on 100 parts by total weight:

[0021]

[0022] Polyethersulfone (PES), polyethersulfone powder (PES powder).

[0023] PES powder has a hot-melt adhesive effect, which can make the pattern adhere to the substrate; titanium dioxide has a covering effect to prevent the bottom from showing through; water-soluble cellulose is a material that thickens and prevents precipitation, and bonds between systems; silane coupling agent improves the bonding force between fillers; talcum powder can prevent excess PES powder in a molten state from sticking to the heat transfer release film.

[0024] Furthermore, the silane coupling agent is preferably at least one of a vinyl silane coupling agent and an amino silane coupling agent.

[0025] The preparation steps of the thermoplastic elastomer composition include:

[0026] (1) Add titanium dioxide and water-soluble cellulose to water in proportion and stir evenly (preferably at a stirring speed of 800 r / min);

[0027] (2) adding talcum powder to the mixed solution of step (1) in proportion during the stirring process, and stirring evenly (preferably stirring for more than 5 minutes);

[0028] (3) Adding polyethersulfone powder and silane coupling agent to the mixed solution of step (2) in proportion, stirring evenly (preferably stirring for more than 20 minutes) to obtain a thermoplastic elastomer composition.

[0029] The thermoplastic elastic plastic composition is uniformly coated on a polyethylene terephthalate release film (ie, a PET release film), and then dried (preferably at a drying temperature of 70° C.), to obtain a white hot melt adhesive transfer film.

[0030] Beneficial effects of the present invention:

[0031] (1) Compared with the printing procedure of traditional heat transfer ink printers, this type of ink no longer needs to spray red, yellow, blue and black inks first, and then spray white ink. It can be directly printed on the heat transfer release film through a home printer and then sprinkled with hot melt adhesive powder for thermal transfer to a white substrate or transferred to a dark substrate using a white hot melt adhesive transfer film. Users do not need to modify the printer's inkjet procedure, so users no longer need to modify the printer to complete the heat transfer, which lowers the threshold for customers to use and reduces consumption items; it is conducive to promotion and use;

[0032] (2) Compared with the printing process of traditional heat transfer ink printers, this type of ink does not use white ink, so there will be no problem of white ink clogging the nozzle;

[0033] (3) The preparation method is simple and easy to produce.

[0034] The digital heat transfer ink suitable for printing with a home printer of the present invention can be well adapted to a CMKY four-color printer and a CMKY LC LM six-color printer, and can reduce the threshold and consumption items of more DIY enthusiasts.

[0035] The present invention mainly focuses on ink transfer, optimizes the transfer method and ink performance, realizes green environmental protection requirements and upgrades the transfer method, uses hot melt adhesive powder or white hot melt adhesive paper for transfer without modifying the printer, and the ink does not clog the printer when sealing. It has excellent continuous spraying properties, good deterioration over time, and water washing fastness, and the pattern is bright and uniform in color and the film is soft and elastic. DETAILED DESCRIPTION

[0036] In order to more clearly reflect the technical scheme and technical effects of the present invention, preferred embodiments of the present invention are given below. However, the present invention can be implemented in many different forms and is not limited to the embodiments described herein. Therefore, the detailed description of the embodiments of the present invention provided below is not intended to limit the scope of protection of the present invention.

[0037] The technical solution of the present invention is further illustrated below through specific embodiments to provide a better understanding of the present invention.

[0038] A digital heat transfer ink suitable for home printer printing in Examples 1-3 and aqueous inks in Comparative Examples 1 and 2 were prepared according to the weight ratios shown in Table 1, wherein the total weight of each component in each Example and Comparative Example is 100 parts by weight:

[0039] Table 1

[0040]

[0041] A digital heat transfer ink suitable for home printers, the viscosity of the ink is 8cp, the surface tension is 35mN / m, and the particle size of the solid particles is ≤250nm.

[0042] The preparation method of the digital heat transfer ink suitable for home printers of this embodiment is as follows: deionized water, organic solvent, oleic acid dipolyglycerol ester and self-crosslinking waterborne polyurethane dispersion are added in proportion, stirred evenly, and then a colorant and polyether co-modified silicone oil are added in sequence, the pH value is adjusted to 7 with a citric acid-sodium citrate buffer, and filtered with a 200-mesh sieve to obtain the digital heat transfer ink suitable for home printers.

[0043] The digital heat transfer ink suitable for home printers of this embodiment complies with the industry standard: the color difference value △E≤3 between a monochrome print and a monochrome fill print in the CMKY mode of professional drawing software.

[0044] The preparation methods of the white hot melt adhesive transfer films in the embodiments and comparative examples are the same. Specifically, the preparation method of the white hot melt adhesive transfer film is as follows: the thermoplastic elastic plastic composition is evenly coated on the PET release film and dried at 70° C. to obtain the white hot melt adhesive transfer film.

[0045] The preparation steps of the thermoplastic elastomer composition include:

[0046] (1) Add titanium dioxide and water-soluble cellulose to water in proportion and stir evenly at a stirring speed of 800 r / min;

[0047] (2) adding talcum powder to the mixed solution of step (1) in proportion during the stirring process, and stirring for 5 minutes until the mixture is uniform;

[0048] (3) Add polyethersulfone powder and silane coupling agent to the mixed solution of step (2) in proportion, and stir for 20 minutes until the mixture is uniform, to obtain a thermoplastic elastomer composition.

[0049] The thermoplastic elastomer composition comprises the following components by weight based on 100 parts by total weight:

[0050]

[0051] The silane coupling agent is a vinyl silane coupling agent.

[0052] The transfer methods of the embodiments and comparative examples are the same, and the specific transfer methods are as follows: the first method is to print digital heat transfer ink suitable for home printers on the heat transfer release film through a home printer, evenly sprinkle hot melt adhesive powder, and then bake the hot melt adhesive powder to a molten state (bake at 160°C for 5 minutes), and then face the transfer layer of the heat transfer release film to the white printing substrate, and press at a temperature of 155°C for 20 seconds; the other method is to print digital heat transfer ink suitable for home printers on the heat transfer release film through a home printer, cover the pattern surface on the white hot melt adhesive transfer film, press at 180°C for 2 minutes, and then tear it off, so that the pattern is attached to the white hot melt adhesive, and then face the transfer layer of the heat transfer release film to the colored printing substrate, and press at a temperature of 155°C for 20 seconds.

[0053] Performance Testing

[0054] Test Item 1: Continuous Spraying

[0055] Take 100 ml of each of the inks obtained in Examples 1-2 and Comparative Examples 1-4, and test the continuous jetting properties according to "CY_T 254-2022 Inkjet Printing Ink Usage Requirements and Test Methods".

[0056] Test Item 2: Deterioration over time

[0057] 100 ml of each of the inks obtained in Examples 1-2 and Comparative Examples 1-4 were taken and tested for degradation over time according to "QB T 2730.1 Ink for Inkjet Printers".

[0058] Test Item 3: Color fastness of ink to washing

[0059] Take 100 ml of each of the inks obtained in Examples 1-2 and Comparative Examples 1-4, and test the color fastness to washing according to GB / T 5713-2013 Textiles - Tests for Color Fastness to Water.

[0060] The test results are shown in Table 2.

[0061] Table 2 Performance test results of various embodiments and comparative examples

[0062]

[0063]

[0064] From the results in Table 2, it can be seen that the content of diglycerol oleate and polyether co-modified silicone oil in Example 1 is the highest, and in the spraying continuity test results, line breakage and oblique spraying are the least.

[0065] In summary, when the ink prepared in Example 1-2 is continuously printed on A4 paper, there is no ink interruption in the printing process, the printed patterns and imprint boundaries are clear and not blurred, the fineness is high, and the time-dependent degradation after being heated at a constant temperature of 40°C for 120 hours is still qualified, there is no ink clogging, and normal printing and transfer are performed. The water washability is at level 4-5, and the water washability is good.

[0066] The content of the polyether co-modified silicone oil in Comparative Examples 1 and 3 is too low, resulting in ink breaking.

[0067] The content of polyether co-modified silicone oil in Comparative Examples 2 and 4 is too high, and the ink cannot be produced normally.

[0068] The above is only a preferred embodiment of the present invention. It should be understood that the present invention is not limited to the form disclosed herein, and should not be regarded as excluding other embodiments, but can be used in various other combinations, modifications and environments, and can be modified within the scope of the concept described herein through the above teachings or the technology or knowledge of the relevant field. The changes and modifications made by those skilled in the art shall not deviate from the spirit and scope of the present invention, and shall be within the scope of protection of the claims attached to the present invention.

Claims

1. A digital heat transfer ink suitable for home printers, characterized in that: The raw materials include: resin, organic solvent, polyether co-modified silicone oil, water, colorant, and oleic acid dipolyglycerol ester, wherein the resin is water-based polyurethane.

2. The digital heat transfer ink suitable for home printers according to claim 1, characterized in that: The waterborne polyurethane is a self-crosslinking waterborne polyurethane dispersion.

3. The digital heat transfer ink suitable for home printers according to claim 1 or 2, characterized in that: Calculated by weight, based on 100 parts by total weight, the raw materials include:

4. The digital heat transfer ink suitable for home printers according to claim 1 or 2, characterized in that: The colorant is a dispersed color paste or a color type; and / or the organic solvent is at least one of propylene glycol, glycerol, ethylene glycol, and glycerol.

5. The digital heat transfer ink suitable for home printers according to claim 1 or 2, characterized in that: The viscosity of the ink is 5cp to 11cp, and the surface tension is 30mN / m to 42mN / m; and / or the particle size of the solid particles of the digital heat transfer ink is ≤250nm.

6. A method for preparing a digital heat transfer ink suitable for a home printer as claimed in any one of claims 1 to 5, characterized in that: The following steps are involved: Water, organic solvent, oleic acid dipolyglycerol ester and self-crosslinking waterborne polyurethane dispersion are added in proportion and stirred evenly, and then colorant and polyether co-modified silicone oil are added in sequence, the pH value is adjusted to 6-9, and filtered through a 200-300 mesh sieve to obtain digital heat transfer ink suitable for home printers.

7. The use of digital heat transfer ink suitable for home printers as claimed in any one of claims 1 to 5, characterized in that: The transfer method is as follows: the first method is to print ink on the heat transfer release film through a home printer, evenly sprinkle hot melt adhesive powder, bake the hot melt adhesive powder to a molten state, and then heat press it onto a white substrate; the other method is to print ink on the heat transfer release film through a home printer, then cover the pattern surface on a white hot melt adhesive transfer film, tear it off after pressing, so that the pattern is stained with white hot melt adhesive, and then the transfer layer of the heat transfer release film is facing the colored printing substrate, and heat pressing is performed.

8. The application of digital heat transfer ink suitable for home printers according to claim 7, characterized in that: The white hot melt adhesive transfer film is coated with a thermoplastic elastomeric plastic composition; The thermoplastic elastomer composition comprises the following components by weight based on 100 parts by total weight:

9. The application of digital heat transfer ink suitable for home printers according to claim 8, characterized in that: The preparation steps of the thermoplastic elastomer composition include: (1) adding titanium dioxide and water-soluble cellulose to water in proportion and stirring evenly; (2) adding talcum powder to the mixed solution of step (1) in proportion during the stirring process and stirring evenly; (3) Adding polyethersulfone powder and silane coupling agent to the mixed solution of step (2) in proportion, stirring evenly, to obtain a thermoplastic elastomer composition.

10. The application of digital heat transfer ink suitable for home printers according to claim 9, characterized in that: The thermoplastic elastic plastic composition is uniformly coated on the polyethylene terephthalate release film and dried to obtain a white hot melt adhesive transfer film.

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