CN113930983A - Digital pyrograph ink and preparation method thereof - Google Patents
Digital pyrograph ink and preparation method thereof Download PDFInfo
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- CN113930983A CN113930983A CN202111383586.0A CN202111383586A CN113930983A CN 113930983 A CN113930983 A CN 113930983A CN 202111383586 A CN202111383586 A CN 202111383586A CN 113930983 A CN113930983 A CN 113930983A
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- D—TEXTILES; PAPER
- D06—TREATMENT OF TEXTILES OR THE LIKE; LAUNDERING; FLEXIBLE MATERIALS NOT OTHERWISE PROVIDED FOR
- D06P—DYEING OR PRINTING TEXTILES; DYEING LEATHER, FURS OR SOLID MACROMOLECULAR SUBSTANCES IN ANY FORM
- D06P1/00—General processes of dyeing or printing textiles, or general processes of dyeing leather, furs, or solid macromolecular substances in any form, classified according to the dyes, pigments, or auxiliary substances employed
- D06P1/44—General processes of dyeing or printing textiles, or general processes of dyeing leather, furs, or solid macromolecular substances in any form, classified according to the dyes, pigments, or auxiliary substances employed using insoluble pigments or auxiliary substances, e.g. binders
- D06P1/52—General processes of dyeing or printing textiles, or general processes of dyeing leather, furs, or solid macromolecular substances in any form, classified according to the dyes, pigments, or auxiliary substances employed using insoluble pigments or auxiliary substances, e.g. binders using compositions containing synthetic macromolecular substances
- D06P1/5264—Macromolecular compounds obtained otherwise than by reactions involving only unsaturated carbon-to-carbon bonds
- D06P1/5285—Polyurethanes; Polyurea; Polyguanides
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- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09D—COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
- C09D11/00—Inks
- C09D11/30—Inkjet printing inks
-
- D—TEXTILES; PAPER
- D06—TREATMENT OF TEXTILES OR THE LIKE; LAUNDERING; FLEXIBLE MATERIALS NOT OTHERWISE PROVIDED FOR
- D06P—DYEING OR PRINTING TEXTILES; DYEING LEATHER, FURS OR SOLID MACROMOLECULAR SUBSTANCES IN ANY FORM
- D06P1/00—General processes of dyeing or printing textiles, or general processes of dyeing leather, furs, or solid macromolecular substances in any form, classified according to the dyes, pigments, or auxiliary substances employed
- D06P1/44—General processes of dyeing or printing textiles, or general processes of dyeing leather, furs, or solid macromolecular substances in any form, classified according to the dyes, pigments, or auxiliary substances employed using insoluble pigments or auxiliary substances, e.g. binders
- D06P1/52—General processes of dyeing or printing textiles, or general processes of dyeing leather, furs, or solid macromolecular substances in any form, classified according to the dyes, pigments, or auxiliary substances employed using insoluble pigments or auxiliary substances, e.g. binders using compositions containing synthetic macromolecular substances
- D06P1/5207—Macromolecular compounds obtained by reactions involving only carbon-to-carbon unsaturated bonds
- D06P1/525—Polymers of unsaturated carboxylic acids or functional derivatives thereof
-
- D—TEXTILES; PAPER
- D06—TREATMENT OF TEXTILES OR THE LIKE; LAUNDERING; FLEXIBLE MATERIALS NOT OTHERWISE PROVIDED FOR
- D06P—DYEING OR PRINTING TEXTILES; DYEING LEATHER, FURS OR SOLID MACROMOLECULAR SUBSTANCES IN ANY FORM
- D06P5/00—Other features in dyeing or printing textiles, or dyeing leather, furs, or solid macromolecular substances in any form
Abstract
The application relates to a digital pyrograph ink and a preparation method thereof, wherein the ink comprises the following components in parts by weight: 5-30% of white pigment dispersion liquid, 10-20% of organic solvent, 15-25% of water-based polycarbonate polyurethane, 1-10% of dispersible acrylic resin, 1-5% of water-based closed isocyanate, 1-5% of surfactant and the balance of water; wherein the surfactant comprises at least one fluorine-containing surfactant. The application provides a digital pyrograph ink, compatibility on digital transfer membrane is good, and the ink has excellent wetting, levelling property, and digital pyrograph pattern is clear nature, and the hiding power is strong, and the color is bright, and normal atmospheric temperature, high temperature storage stability are long simultaneously, and the settlement rate is low.
Description
Technical Field
The application relates to the technical field of printing, in particular to digital pyrograph ink and a preparation method thereof.
Background
The traditional Korotkoff pyrograph has a mature use process, but along with the continuous development of individuation and design diversification, the traditional process gradually shows the inapplicability, and the digital pyrograph is different from military projection at the moment, so that the process is simple and flexible, and the color is rich, diversified and very good to adapt to the current printing requirement. However, the problems that the digital pyrograph is slow in development of the digital pyrograph process on dark fabrics due to immaturity of the digital ink, the transfer film and the process are solved, and the problems that the matching of the digital ink and the transfer film is poor, patterns are not formed and clear, formed whiteness and color are insufficient, and the combination of a digital ink coating and a hot melt adhesive is poor, so that the printing fastness is deviated and the like exist mostly.
Disclosure of Invention
In view of the above, the application provides the digital pyrograph ink and the preparation method thereof, a reasonable ink system is adopted, the ink has excellent wetting and leveling properties, the digital pyrograph pattern is clear and natural, the covering power is strong, and the color is bright.
The embodiment of the application provides digital pyrograph ink which comprises the following components in parts by weight: 5-30% of white pigment dispersion liquid, 10-20% of organic solvent, 15-25% of water-based polycarbonate polyurethane, 1-10% of dispersible acrylic resin, 1-5% of water-based closed isocyanate, 1-5% of surfactant and the balance of water; wherein the surfactant comprises at least one fluorine-containing surfactant.
In one embodiment, the ink comprises the following components in parts by weight: 15-30% of white pigment dispersion liquid, 10-15% of organic solvent, 15-25% of water-based polycarbonate polyurethane, 3-7% of dispersible acrylic resin, 1-3% of water-based blocked isocyanate, 1-5% of surfactant and the balance of water, wherein the surfactant comprises acetylene glycol surfactant and fluorine-containing surfactant.
In one embodiment, the organic solvent comprises at least one of ethylene glycol, diethylene glycol, glycerol, polyethylene glycol 400, triethylene glycol monobutyl ether, isopropanol, propylene glycol, 1,5 pentanediol, triethylene glycol, and glycerol ether.
In one embodiment, the aqueous polycarbonate polyurethane comprises one or more of the Japanese polyurethane industries WPC-101, WPC-TX1, WPC-028, WS-6110, WS-6021, RA-5300.
In one embodiment, the aqueous blocked isocyanate includes at least one of toluene diisocyanate, 1, 6-hexamethylene diisocyanate, isophorone diisocyanate, diphenylmethane diisocyanate, dicyclohexylmethane diisocyanate, hexamethylene diisocyanate, and lysine diisocyanate.
In one embodiment, the fluorine-containing surfactant comprises at least one of surfactant FS-50, surfactant FS-6210, surfactant FS-3100, surfactant FS-22, and surfactant FS-3000.
In one embodiment, the weight ratio of the acetylene glycol surfactant to the fluorine-containing surfactant is (10-15): 1.
In one embodiment, the ink satisfies at least one of the following characteristics:
(1) the ink also comprises a humectant, wherein the humectant accounts for 1-3% of the ink by weight;
(2) the ink also comprises a humectant which is caprolactam.
In one embodiment, the ink satisfies at least one of the following characteristics:
(3) the ink also comprises a bactericide, wherein the weight of the bactericide in the ink is 0.1-0.5%;
(4) the ink also comprises a bactericide which is Proxel GXL.
In one embodiment, the ink satisfies at least one of the following characteristics:
(5) the viscosity of the ink is 3.7 cp-5.7 cp;
(6) the surface tension of the ink is 20mN/m to 27 mN/m.
The application provides a digital pyrograph ink can effectively solve the digital pyrograph in the printing problem that the image shaping is unclear, the pattern is clear after the printing, and the hiding power is high, and is compatible strong, and the quantity of pigment dispersion is lower when preparing high concentration ink, under the effect that organic solvent combines together with dispersion type resin, the smoothness is good when can ensure long-time printing, and the stand-by time of ink is long, and the moisture retention is good, and the storage is stable, and the settlement rate is low.
Detailed Description
While the following is a description of the preferred embodiments of the present invention, it should be noted that those skilled in the art can make various modifications and improvements without departing from the principle of the embodiments of the present invention, and such modifications and improvements are considered to be within the scope of the embodiments of the present invention.
In a first aspect, the present application provides a digital pyrograph ink, which comprises the following components by weight: 5-30% of white pigment dispersion liquid, 10-20% of organic solvent, 15-25% of water-based polycarbonate polyurethane, 1-10% of dispersible acrylic resin, 1-5% of water-based closed isocyanate, 1-5% of surfactant and the balance of water; wherein the surfactant comprises at least one fluorine-containing surfactant.
In the scheme, by adding a proper amount of fluorine-containing surfactant into the ink, the surface tension of the liquid can be reduced to the utmost extent under the condition of not increasing the viscosity of the ink, excellent wetting and leveling properties are provided, and particularly the ink is directed at the rapid leveling property, so that the standby time of the ink is prolonged, the moisturizing property is better, and the sedimentation rate is lower; and the patterns printed by the ink are clear and natural, the whiteness is higher, and the covering power is strong.
The ink provided by the application, particularly the aqueous white ink with ultrahigh whiteness, has good stability and ultrahigh whiteness, and has good matching property with a polyethylene terephthalate (PET for short) transfer film.
As an optional technical scheme of the application, the white pigment dispersion liquid is self-grinding color paste. The white pigment dispersion liquid is inorganic pigment titanium dioxide dispersion liquid. The white ink has the advantages of high covering power, clear and natural patterns, good compatibility on a digital transfer film, excellent wetting and leveling performance of the ink, clear and natural digital pyrography patterns, strong covering power, bright color, long stability in normal temperature and high temperature storage and low sedimentation rate.
Alternatively, the weight ratio of the white pigment dispersion in the ink may be specifically 5%, 8%, 10%, 15%, 17%, 18%, 20%, 22%, 25%, 28%, or 30%, but is not limited to the recited values, and other values not recited in the range of the values are also applicable. Preferably, the pigment dispersion liquid is 15 to 30% by weight in the ink.
As an alternative embodiment of the present application, the organic solvent includes at least one of ethylene glycol, diethylene glycol, glycerol, polyethylene glycol 400, triethylene glycol monobutyl ether, isopropyl alcohol, propylene glycol, 1,5 pentanediol, triethylene glycol, and glycerol ether. The organic solvent can improve the dispersion stability of the pigment in the ink.
Preferably, the organic solvent is at least one selected from the group consisting of 1,5 pentanediol, glycerol, propylene glycol, and polyethylene glycol 400. The combination of the alcohol organic solvent and the dispersion resin can improve the smoothness of long-time printing, increase the stand-by time of the ink and ensure good moisture retention; meanwhile, the storage stability at normal temperature and high temperature is long, and the sedimentation rate is low.
Alternatively, the weight ratio of the organic solvent in the ink may be specifically 10%, 12%, 13%, 14%, 15%, 16%, 18%, 19%, 20%, or the like, but is not limited to the recited values, and other values not recited in the range of the values are also applicable. Experiments show that the weight ratio of the organic solvent in the ink is controlled within the range of 10-15%, the water can be sufficiently preserved, and the quick drying property of the ink is not reduced.
As an alternative solution, the water-based polycarbonate polyurethane can be one or more of WPC-101, WPC-TX1, WPC-028, WS-6110, WS-6021 and RA-5300 in the Japanese polyurethane industry. The aqueous polycarbonate polyurethane can improve the film forming property of the ink on a transfer film.
Alternatively, the weight ratio of the aqueous polycarbonate polyurethane in the ink may be specifically 15%, 16%, 18%, 19%, 20%, 22%, 24% or 25%, but is not limited to the recited values, and other values not recited within the range of values are also applicable.
As an alternative embodiment of the present application, the dispersible acrylic resin may be JONCRYL series of Johnson Polymer. The dispersive acrylic resin can accelerate the spreading of the jet printing ink on the transfer printing film medium, so that the image effect is clearer and sharper during high-speed printing.
Alternatively, the weight ratio of the dispersible acrylic resin in the ink may be specifically 1%, 3%, 4%, 4.5%, 5%, 5.5%, 6%, 6.5%, 7%, 8%, 9%, or 10%, etc., but is not limited to the enumerated values, and other non-enumerated values within the range are also applicable. Preferably, the weight percentage of the dispersible acrylic resin in the ink is 3-7%, so that the spreading of the jet printing ink on a transfer printing film medium can be accelerated.
As an alternative solution, the water-based blocked isocyanate includes at least one of toluene diisocyanate, 1, 6-hexamethylene diisocyanate, isophorone diisocyanate, diphenylmethane diisocyanate, dicyclohexylmethane diisocyanate, hexamethylene diisocyanate, and lysine diisocyanate.
The aqueous blocked isocyanate can react with the polyol and improve the adhesion of the ink on the transfer film. Specifically, the aqueous blocked isocyanate may be selected from bayer BL5335, coda BI801, coda BI 200;
alternatively, the weight ratio of the aqueous blocked isocyanate in the ink may be specifically 1%, 1.2%, 1.5%, 1.8%, 2%, 2.2%, 2.5%, 2.8%, 3%, 4%, or 5%, but is not limited to the enumerated values, and other values not enumerated within the range of values are also applicable. Preferably, the weight ratio of the aqueous blocked isocyanate in the ink is 1% to 3%.
As an alternative embodiment of the present invention, the surfactant includes an acetylene glycol surfactant and a fluorine-containing surfactant. The surface active agent can be used as a surface tension regulator, the acetylene glycol surface active agent has wetting and basic leveling effects, but the acetylene glycol surface active agent has small tension reducing effect and strong surface active foaming force, and after the acetylene glycol surface active agent is matched with the fluorine-containing surface active agent, the surface tension of liquid can be greatly reduced under the condition of not increasing viscosity, excellent wetting and leveling properties are provided, and the rapid leveling property is particularly aimed at. Specifically, the fluorine-containing surfactant is a nonionic fluorine-containing surfactant.
The acetylene glycol surfactant may specifically be 2,4,7, 9-tetramethyl-5-decyne-4, 7-diol, 3, 6-dimethyl-4-octyne-3, 6-diol, 3, 5-dimethyl-1-hexyne-3-ol, etc. More specifically, one or more of Surfynol 420, Surfynol 440, Surfynol 465, Surfynol 485, BYK-019, BYK-028, BYK-141, FoamStar SI 2250, AF-103, TEGO TWIN4000, TEGO280, TEGO245, TEGO250 may be used. Preferably, Surfynol 465, TEGO TWIN4000 are used.
As an optional technical scheme of the application, the fluorine-containing surfactant comprises at least one of surfactant FS-50, surfactant FS-6210, surfactant FS-3100, surfactant FS-22 and surfactant FS-3000.
Alternatively, the surfactant may be present in the ink in a weight ratio of 1%, 1.5%, 2%, 2.5%, 3%, 3.5%, 4%, 4.5%, or 5%, and the like, but is not limited to the recited values, and other values not recited within the range of values are also applicable.
In this embodiment, the weight ratio of the acetylene glycol surfactant to the fluorine-containing surfactant is (10 to 15): specifically, 1 may be 10:1, 10.5:1, 11:1, 12:1, 13:1, 14:1 or 15:1, and the like, but is not limited thereto. The two surfactants are matched and combined according to the proportion, so that the whiteness is ensured, and the system is stable and optimal.
As an optional technical scheme of the application, the ink also comprises the following components in percentage by weight: 0.1-0.5% of bactericide which can be isothiazolinone bactericide, and can be at least one of American Dow bactericide BIOBAN BIT-10, American Dow bactericide BIOBAN BIT-20, American Austin bactericide PROXEL GXL and American Austin bactericide PROXEL CMG.
Alternatively, the weight ratio of the biocide in the ink may be specifically 0.1%, 0.15%, 0.2%, 0.25%, 0.3%, 0.35%, 0.4%, 0.45%, or 0.5%, but is not limited to the recited values, and other values not recited within the range of values are also applicable.
Further, the ink also comprises the following components in percentage by weight: the humectant may be, but is not limited to, 1% to 3% by weight, specifically 0.5%, 0.8%, 1.0%, 1.2%, 1.5%, 1.8%, or 2%. The humectant is caprolactam. Preferably, the humectant is 0.5 to 2% by weight of the ink.
The balance of the water can be at least one of tap water, deionized water and distilled water, and preferably, the water is deionized water, so that impurities in the ink can be reduced, and the influence on other components in the ink can also be reduced.
As a preferable technical scheme of the application, the ink comprises the following components in percentage by weight: 15-30% of white pigment dispersion liquid, 10-15% of organic solvent, 15-25% of water-based polycarbonate polyurethane, 3-7% of dispersible acrylic resin, 1-3% of water-based blocked isocyanate, 1-5% of surfactant, 0.5-2% of humectant, 0.1-0.5% of bactericide and the balance of water, wherein the surfactant comprises acetylene glycol surfactant and fluorine-containing surfactant.
As an alternative embodiment of the present application, the viscosity of the ink is 3.7cp to 5.7cp, specifically, 3.7cp, 4.0cp, 4.2cp, 4.5cp, 4.8cp, 5.0cp, 5.2cp, 5.5cp, 5.7cp, etc., but the present invention is not limited to the above-mentioned values, and other values not listed in the above-mentioned value range are also applicable.
In an alternative embodiment of the present invention, the ink has a surface tension of 20mN/m to 27mN/m, specifically 20mN/m, 21mN/m, 22mN/m, 23mN/m, 24mN/m, 25mN/m, 26mN/m, 27mN/m, and the like, but is not limited to the values listed, and other values not listed in the numerical range are also applicable. By controlling the surface tension of the ink within the above range, the smoothness of the ink can be improved.
The application provides a digital pyrography ink, the digital transfer film of usefulness is changeed in the cooperation, can be so that the transfer film on the printed pattern clear nature, white ink hiding power is strong, and bright in color has excellent water-fast washing, antifriction after hot melt adhesive technology, and the bonding fastness of stamp fabric all accords with national test standard.
In a second aspect, an embodiment of the present application further provides a method for preparing a digital pyrograph ink, including the following steps S01 to S02:
step S01, respectively and sequentially adding organic solvents into deionized water, and stirring for 15-30 min; adding surfactant and dispersible acrylic resin, and stirring for 15-30 min; adding water-based polycarbonate polyurethane and water-based closed isocyanate, and stirring for 30-60 min; adding white pigment dispersion, and stirring for 60-120min to obtain mixed solution;
and step S02, filtering the mixed solution by using a 0.6 micron filter membrane to obtain the digital pyrograph ink.
The preparation method of the digital pyrograph ink is simple and high in stability.
The examples of the present application are further illustrated below in various examples. The present embodiments are not limited to the following specific examples. The present invention can be modified as appropriate within the scope of protection.
It should be noted that the percentages of the above and below components of the present invention are weight ratios, and are percentages of the components based on the total weight of the pigment ink, except for specific indications.
1. Preparation of digital pyrograph ink
Examples 1 to 2:
the formula of each component of examples 1-2 prepared according to the preparation method of the digital pyrograph ink provided by the second aspect of the present application is shown in table 1.
The formula of each component of comparative examples 1-2 prepared according to the preparation method of the digital pyrograph ink provided by the second aspect of the present application is shown in table 1.
TABLE 1
Test items
(1) Standing test at normal temperature
And (3) pouring 30ml of color paste into the ink by using a 50ml measuring cylinder, standing at normal temperature for settling, and measuring the surface water-dividing settling height. The test results are shown in table 3 below:
TABLE 3
| Standing at room temperature for 3 days | Standing at room temperature for 7 days | Standing at room temperature for 14 days | Standing at room temperature for more than 30 days | |
| Example 1 | 1mm | 4mm | 7mm | 16mm |
| Example 2 | 2mm | 5mm | 9mm | 17mm |
| Comparative example 1 | 5mm | 7mm | 15mm | 19mm |
| Comparative example 2 | 5mm | 8mm | 18mm | 25mm |
(2) Ink aging stability test
And (3) placing the ink in a constant-temperature oven at 60 ℃ for 14 days, taking out the ink, placing the ink at room temperature to a recovery room temperature, and measuring parameters of the ink. The viscosity change rate (14 days high temperature viscosity-room temperature viscosity) ÷ room temperature viscosity, and the test results are shown in table 4 below:
TABLE 4
| Viscosity (cps) at room temperature for 14 days | Viscosity (cps) high temperature for 14 days | Rate of change of viscosity | |
| Example 1 | 4.80 | 4.66 | 2.91％ |
| Example 2 | 4.85 | 4.67 | 3.71％ |
| Comparative example 1 | 4.54 | 4.29 | 5.50％ |
| Comparative example 2 | 4.75 | 4.45 | 6.31％ |
(3) Ink printing status and standby test
Remarking: the ink amount under the printing test of the same 4720 double-head printer is unified to 100%.
According to the test results, the digital pyrograph white ink prepared in the embodiments 1-2 has excellent performances in sedimentation resistance, whiteness and high-temperature storage stability, and in the same pyrograph film test, the same ink discharge amount has better film forming performance, so that the common problem of the digital pyrograph white ink in the market is solved.
Comparative example 1, in which no humectant was added, the printing smoothness of the ink decreased, the covering power of the white ink decreased, and the printed pattern was unclear.
Comparative example 2 no fluorine-containing surfactant was added, the acetylene glycol surfactant had a small effect of reducing the tension, the surface active foaming force was strong, and the leveling property of the ink was lowered.
Although the present application has been described with reference to preferred embodiments, it is not intended to limit the scope of the claims, and many possible variations and modifications may be made by one skilled in the art without departing from the spirit of the application.
Claims (10)
1. The digital pyrograph ink is characterized by comprising the following components in parts by weight: 5-30% of white pigment dispersion liquid, 10-20% of organic solvent, 15-25% of water-based polycarbonate polyurethane, 1-10% of dispersible acrylic resin, 1-5% of water-based closed isocyanate, 1-5% of surfactant and the balance of water; wherein the surfactant comprises at least one fluorine-containing surfactant.
2. The digital pyrograph ink according to claim 1, comprising the following components in parts by weight: 15-30% of white pigment dispersion liquid, 10-15% of organic solvent, 15-25% of water-based polycarbonate polyurethane, 3-7% of dispersible acrylic resin, 1-3% of water-based blocked isocyanate, 1-5% of surfactant and the balance of water, wherein the surfactant comprises acetylene glycol surfactant and fluorine-containing surfactant.
3. The digital pyrograph ink according to claim 1 or 2, wherein the organic solvent includes at least one of ethylene glycol, diethylene glycol, glycerin, polyethylene glycol 400, triethylene glycol monobutyl ether, isopropyl alcohol, propylene glycol, 1,5 pentanediol, triethylene glycol, and glycerin ether.
4. The digital pyrograph ink according to claim 1 or 2, wherein the aqueous polycarbonate polyurethane comprises one or more of the japanese polyurethane industry WPC-101, WPC-TX1, WPC-028, WS-6110, WS-6021, RA-5300.
5. The digital pyrograph ink according to claim 1 or 2, wherein the water-based blocked isocyanate comprises at least one of toluene diisocyanate, 1, 6-hexamethylene diisocyanate, isophorone diisocyanate, diphenylmethane diisocyanate, dicyclohexylmethane diisocyanate, hexamethylene diisocyanate, and lysine diisocyanate.
6. The digital pyrograph ink according to claim 1 or 2, wherein the fluorine-containing surfactant comprises at least one of a surfactant FS-50, a surfactant FS-6210, a surfactant FS-3100, a surfactant FS-22, and a surfactant FS-3000.
7. The digital pyrograph ink according to claim 2, wherein the weight ratio of the acetylene glycol surfactant to the fluorine-containing surfactant is (10 to 15): 1.
8. The digital pyrograph ink according to claim 1 or 2, wherein the ink satisfies at least one of the following characteristics:
(1) the ink also comprises a humectant, wherein the humectant accounts for 1-3% of the ink by weight;
(2) the ink also comprises a humectant which is caprolactam.
9. The digital pyrograph ink according to claim 1 or 2, wherein the ink satisfies at least one of the following characteristics:
(3) the ink also comprises a bactericide, wherein the weight of the bactericide in the ink is 0.1-0.5%;
(4) the ink also comprises a bactericide which is Proxel GXL.
10. The digital pyrograph ink according to claim 1 or 2, wherein the ink satisfies at least one of the following characteristics:
(5) the viscosity of the ink is 3.7 cp-5.7 cp;
(6) the surface tension of the ink is 20mN/m to 27 mN/m.
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