CN112778837A - Water-based pigment ink and preparation method thereof - Google Patents

Abstract

The application relates to water-based pigment ink and a preparation method thereof, wherein the water-based pigment ink comprises the following components in percentage by weight: 10 to 35 percent of pigment color paste, 10 to 30 percent of aqueous organic solvent, 0.2 to 4 percent of polyvinylpyrrolidone, 0.5 to 2 percent of high molecular weight block copolymer dispersant containing pigment affinity group, 3 to 20 percent of aqueous resin and the balance of water; wherein the weight ratio of the pigment affinity group-containing high molecular weight block copolymer dispersant to the polyvinylpyrrolidone is 3: (1-3). The water-based pigment ink provided by the application can improve the stability of an organic pigment system which is difficult to disperse.

Description

Water-based pigment ink and preparation method thereof

Technical Field

The present application relates to the field of printing technology, and in particular, to water-based pigment inks and methods of making the same.

Background

The ink-jet ink is usually a nano-grade material, and the water-based pigment ink mainly comprises resin, a solvent, an auxiliary agent and color paste. In the process of developing ink, not all preliminary formulas are made stably, and the problems that the viscosity of the ink is greatly increased, the particle size of the ink is increased, the printing smoothness is poor and even a nozzle is blocked after the ink is placed for a long time or is aged are mainly reflected. The reasons for these problems are mainly three: firstly, due to the variety of synthetic resins and different resin synthesis processes, the resin composition has certain difference; secondly, the composition difference of the nano color paste is large; thirdly, the selected solvent influences the ink formula. The above-mentioned reasons are that the nanoparticles in the ink re-agglomerate into larger particles or swell the polymer resin, and the dispersion stability of the ink is lowered, particularly the stability after long-term storage is deteriorated.

Disclosure of Invention

In view of this, the present application provides water-based pigment inks and methods of making the same that employ a reasonable ink system to increase the stability of a difficult-to-disperse organic pigment system.

In a first aspect, embodiments of the present application provide a water-based pigment ink comprising the following components in percentage by weight: 10 to 35 percent of pigment color paste, 10 to 30 percent of aqueous organic solvent, 0.2 to 4 percent of polyvinylpyrrolidone, 0.5 to 2 percent of high molecular weight block copolymer dispersant containing pigment affinity group, 3 to 20 percent of aqueous resin and the balance of water; wherein the weight ratio of the pigment affinity group-containing high molecular weight block copolymer dispersant to the polyvinylpyrrolidone is 3: (1-3).

In one possible embodiment, the aqueous organic solvent comprises ethylene glycol, diethylene glycol, triethylene glycol, propylene glycol, glycerol, 1, 2-propanediol, pentanediol, 1, 2-hexanediol, n-propanol, isopropanol, diethylene glycol, triethylene glycol, tetraethylene glycol, polyethylene glycol 400, polyethylene glycol-600, polyethylene glycol-900, at least one of triethylene glycol monobutyl ether, glycerol ether, ethylene glycol monopropyl ether, ethylene glycol isopropyl ether, ethylene glycol monobutyl ether, ethylene glycol isobutyl ether, propylene glycol monomethyl ether, propylene glycol monoethyl ether, propylene glycol monopropyl ether, propylene glycol monobutyl ether, diethylene glycol monomethyl ether, diethylene glycol monoethyl ether, diethylene glycol monopropyl ether, triethylene glycol monobutyl ether, dipropylene glycol monomethyl ether, dipropylene glycol monoethyl ether, dipropylene glycol monopropyl ether, and 2-pyrrolidone.

In one possible embodiment, the water-based pigment ink comprises the following components in weight percent: 10 to 35 percent of pigment color paste, 10 to 30 percent of aqueous organic solvent, 0.5 to 1.5 percent of polyvinylpyrrolidone, 1 to 1.5 percent of high molecular weight block copolymer dispersant containing pigment affinity group, 3 to 20 percent of aqueous resin and the balance of water.

In one possible embodiment, the aqueous resin includes at least one of a polyurethane-based resin, an acrylic-based resin, a styrene-acrylic-based resin, and a polyester-based resin.

In one possible embodiment, the water-based pigment ink further comprises the following components in percentage by weight: 0.3 to 3 percent of surfactant, 0.1 to 1 percent of pH regulator and 0.05 to 0.2 percent of bactericide.

In one possible embodiment, the surfactant includes at least one of an acetylene glycol-based surfactant and a silicone-based surfactant.

In one possible embodiment, the antimicrobial agent is a benzisothiazolinone.

In one possible embodiment, the PH adjuster comprises at least one of triethanolamine, diethanolamine, aqueous ammonia, and 2-amino-2-methyl-1-propanol.

In one possible embodiment, the water-based pigment ink satisfies at least one of the following characteristics a to d:

a. the viscosity of the ink is 3.0 cp-5.0 cp;

b. the surface tension of the ink is 23 mN/m-30 mN/m;

c. the conductivity of the ink is 0.2 ms/cm-1.5 ms/cm;

d. the pH value of the ink is 7-10.

In a second aspect, the present application is directed to a method of making a water-based pigment ink comprising the steps of:

sequentially adding the following components in percentage by weight into water: 0.2 to 4 percent of polyvinylpyrrolidone, 0.5 to 2 percent of high molecular weight block copolymer dispersant containing pigment affinity groups, 10 to 30 percent of aqueous organic solvent, 0.3 to 3 percent of surfactant, 0.1 to 1 percent of pH regulator, 0.05 to 0.2 percent of bactericide, 3 to 20 percent of aqueous resin and 10 to 35 percent of pigment color paste are stirred to obtain mixed solution;

and filtering the mixed solution by using a filter membrane or a filter element with the diameter less than or equal to 0.6 micron to obtain the water-based pigment ink.

Has the advantages that:

the high molecular weight block copolymer containing pigment affinity groups is added into the ink to serve as a wetting dispersant, and the polyvinylpyrrolidone is added to serve as a dispersion stabilizing aid, so that the viscosity reducing effect is excellent and effective, the dispersibility of the organic pigment in an ink system can be enhanced, and the thermal stability of the ink is improved. The long-term storage stability of the ink using the combination of the two auxiliary agents is remarkably improved, and the ink is particularly effective for organic pigment systems which are difficult to disperse; and the printing smoothness and long-term storage stability of the ink can be improved.

Detailed Description

While the following is a preferred embodiment of the embodiments of the present application, it should be noted that those skilled in the art can make various improvements and modifications without departing from the principle of the embodiments of the present application, and such improvements and modifications are also considered to be within the scope of the embodiments of the present application.

In a first aspect, the present application provides a water-based pigment ink comprising the following components in weight percent: 10 to 35 percent of pigment color paste, 10 to 30 percent of aqueous organic solvent, 0.2 to 4 percent of polyvinylpyrrolidone, 0.5 to 2 percent of high molecular weight block copolymer dispersant containing pigment affinity group, 3 to 20 percent of aqueous resin and the balance of water.

The water-based pigment ink provided by the application can improve the storage stability of the ink and optimize the viscosity stability in the ink storage process by improving a formula system, and can be used for preparing a plurality of application fields such as wide-width machines, desktop machines and digital printing machines.

The pigment paste may be an organic color paste, and as the organic color paste, azo pigments, polycyclic pigments, dye chelates (for example, basic dye chelates, acidic dye chelates, and the like), nitro pigments, nitroso pigments, aniline black, and the like may be used, for example.

Further, the azo pigment includes at least one of an azo lake pigment, an insoluble azo pigment, an azo condensation pigment, and a chelate azo pigment. The polycyclic pigment includes at least one of phthalocyanine pigment, perinone pigment, anthraquinone pigment, quinacridone pigment, dioxazine pigment, thioindigo pigment, isoindolinone pigment, and quinophthalone pigment.

Specifically, the pigment paste may be a dispersible color paste; for example, a pigment may be dispersed in water by a dispersant to prepare a dispersible color paste. The color paste may be a self-dispersible color paste which is a pigment that can be dispersed in water without using a dispersant and is a pigment that is bonded to at least one functional group of a carboxyl group, a hydroxyl group, and a sulfo group or a salt thereof by surface treatment of the pigment. Examples of the surface treatment method include vacuum plasma treatment, diazo coupling treatment, and oxidation treatment. By the above surface treatment, a functional group or a molecule containing a functional group is grafted to the surface of the pigment, thereby obtaining a self-dispersible pigment.

The pigment color paste comprises at least one of yellow pigment, red pigment, blue pigment, black pigment and white pigment. The pigment paste may be, for example, pigment black 7, pigment black 11, pigment blue 1, pigment blue 15:3, pigment blue 15:4, pigment blue 15:6, pigment yellow 34, pigment yellow 55, pigment yellow 74, pigment yellow 100, pigment red 2, pigment red 38, pigment red 92, pigment red 108, pigment red 122, and the like.

Alternatively, the pigment paste may be present in the water-based pigment ink in an amount of about 10%, about 12%, about 15%, about 18%, about 20%, about 22%, about 25%, about 28%, about 30%, about 32%, or about 35% by weight, but is not limited to the recited values, and other values not recited within the recited ranges are equally applicable. Preferably, the weight ratio of the color paste in the pigment ink is 15% to 30%.

In some embodiments, the pigment paste may be, for example, diamond D75C, D71V19, D71Y, or the like; 4G-PT VP2669, E5B-PT VP3565, E-PT, BG-PT and the like, made by Clariana, USA, and 2034, 2126, 2163, 2172, made by Nippon Kaisha.

Optionally, the aqueous organic solvent comprises ethylene glycol, diethylene glycol, triethylene glycol, propylene glycol, glycerol, 1, 2-propylene glycol, pentanediol, 1, 2-hexanediol, n-propanol, isopropanol, diethylene glycol, triethylene glycol, tetraethylene glycol, polyethylene glycol 400, polyethylene glycol-600, polyethylene glycol-900, at least one of triethylene glycol monobutyl ether, glycerol ether, ethylene glycol monopropyl ether, ethylene glycol isopropyl ether, ethylene glycol monobutyl ether, ethylene glycol isobutyl ether, propylene glycol monomethyl ether, propylene glycol monoethyl ether, propylene glycol monopropyl ether, propylene glycol monobutyl ether, diethylene glycol monomethyl ether, diethylene glycol monoethyl ether, diethylene glycol monopropyl ether, triethylene glycol monobutyl ether, dipropylene glycol monomethyl ether, dipropylene glycol monoethyl ether, dipropylene glycol monopropyl ether, and 2-pyrrolidone.

Alternatively, the weight ratio of the aqueous organic solvent in the water-based pigment ink may be specifically 10%, 13%, 15%, 18%, 20%, 25%, 28%, or 30%, but is not limited to the enumerated values, and other unrecited values within this range are also applicable. Tests show that the standby performance of the ink in a printer can be met without reducing the quick drying property of the pigment ink by controlling the weight ratio of the organic solvent in the pigment ink to be within the range of 10-30%.

Alternatively, the weight ratio of the pigment affinity group-containing high molecular weight block copolymer dispersant in the water-based pigment ink may be specifically 0.5%, 0.8%, 1.0%, 1.2%, 1.3%, 1.4%, 1.5%, 1.6%, 1.7%, 1.8%, 1.9%, or 2.0%, and the like, but is not limited to the enumerated values, and other unrecited values within this range of values are also applicable. It is understood that the high molecular weight block copolymer containing a pigment affinity group has an excessive amount of dispersant, and the viscosity of the ink increases significantly after aging, which is not favorable for long-term storage. Preferably, the pigment affinity group-containing high molecular weight block copolymer dispersant is present in the water-based pigment ink in an amount of 1 to 1.5% by weight.

Further, the weight ratio of the pigment affinity group-containing high molecular weight block copolymer dispersant to polyvinylpyrrolidone is 3: (1 to 3) specifically, it may be 3:1, 3:1.2, 3:1.5, 3:1.8, 3:2, 3:2.5 or 3:3, but is not limited to the above-mentioned numerical values, and other numerical values not mentioned in the numerical value range are also applicable. Through a plurality of tests, when the weight ratio of the high molecular weight block copolymer containing the pigment affinity group to the polyvinylpyrrolidone is higher than 3:1, namely, the addition amount of the high molecular weight block copolymer containing the pigment affinity group is too much, the viscosity of the ink is obviously increased after aging, and the long-term storage is not facilitated. When the weight ratio of the high molecular weight block copolymer containing pigment affinity groups to the polyvinylpyrrolidone is less than 3:3, namely the polyvinylpyrrolidone (PVP for short) is added in an excessive amount, although the viscosity of the ink is not changed greatly after aging, the viscosity of the ink is too high in the normal use process, the ink smoothness is reduced, and the printing effect is poor.

In a specific embodiment, the pigment affinity group-containing high molecular weight block copolymer dispersant may be specifically BYK190, BYK2012, BYK2013, etc., wackel specialty chemicals VOK-5585, DIS-7790, etc., which are not limited herein.

Alternatively, the weight ratio of the polyvinylpyrrolidone (PVP) in the water-based pigment ink may be specifically 0.2%, 0.3%, 0.5%, 0.6%, 0.8%, 1.0%, 1.2%, 1.4%, 1.5%, 1.8%, 2.0%, 2.2%, 2.5%, 2.8%, 3.0%, 3.5%, or 4.0%, etc., but is not limited to the enumerated values, and other unrecited values within the range of values are also applicable. It is understood that when the amount of polyvinylpyrrolidone (PVP) added to the ink is too large, the viscosity of the ink increases, the ink smoothness decreases, and the printing effect is poor. Preferably, the polyvinylpyrrolidone (PVP) is present in the water-based pigment ink in a weight ratio of 0.5% to 1.5%.

The polyvinylpyrrolidone (PVP) may be PVPK-12, PVPF-15, PVPF-25, or PVPF-30; jiangyin Jiafeng chemical companies K15, K30 and the like, but are not limited herein.

Alternatively, the weight ratio of the aqueous resin in the water-based pigment ink may be specifically 3%, 4.5%, 5%, 7.5%, 10%, 13.5%, 15%, 17.5%, or 20%, but is not limited to the enumerated values, and other unrecited values within this range are also applicable.

Alternatively, the aqueous resin includes at least one of a polyurethane-based resin, an acrylic resin, a styrene-acrylic resin, and a polyester-based resin. Preferably, the aqueous resin is a polyurethane resin. For example, the polyurethane may be an aqueous polycarbonate polyurethane or an aqueous blocked isocyanate. In some embodiments, the polyurethane-based resin may be Kostew D-502, DSM company R-961, Unicode H34A, Anda Cita AH-1502, or the like;

further, the water-based pigment ink also comprises the following components in percentage by weight: 0.3-3% of surfactant, 0.1-1% of pH regulator and 0.05-0.2% of bactericide.

Alternatively, the weight ratio of the surfactant in the water-based pigment ink may be specifically 0.3%, 0.5%, 1.0%, 1.2%, 1.5%, 1.7%, 1.9%, 2%, 2.1%, 2.2%, 2.3%, 2.4%, 2.5%, 2.6%, 2.7%, 2.8%, or 3.0%, and the like, but is not limited to the enumerated values, and other unrecited values within this range of values are also applicable.

As an alternative embodiment of the present invention, the surfactant includes at least one of an acetylene glycol surfactant and a silicone surfactant. Preferably, the surfactant is an acetylenic diol 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. In specific embodiments, the product may be selected from the group consisting of Surfynol 465, Surfynol 485, Surfynol 420, Surfynol 440, Dynol 604, Dynol 607, New Gamma Chemicals GS-4100, Zhejiang; tianjin Seffei Chemicals D-502, FS-360, AfCONA3580, Effkona, and the like.

The addition of the surfactant can reduce the surface tension of the ink, so that the ink has excellent printing fluency on printing equipment.

Alternatively, the weight ratio of the bactericide in the water-based pigment ink may be specifically 0.05%, 0.08%, 0.1%, 0.12%, 0.15%, 0.18%, or 0.2%, and the like, but is not limited to the enumerated values, and other values not enumerated within the range of values are also applicable.

As an optional technical solution of the present application, the bactericide is benzisothiazolinone, and specifically may be PROXEL GXL of olympic corporation, Nipacide BIT20 of clariant corporation, and the like.

Alternatively, the weight ratio of the pH adjuster in the water-based pigment ink may be specifically 0.05%, 0.08%, 0.1%, 0.12%, 0.15%, 0.18%, or 0.2%, and the like, but is not limited to the enumerated values, and other unrecited values within this range are also applicable. Specifically, the PH adjuster includes at least one of triethanolamine, diethanolamine, aqueous ammonia, and 2-amino-2-methyl-1-propanol.

In this embodiment, the balance of the water may be at least one of tap water, deionized water, and distilled water, and preferably, the water is deionized water, so that impurities in the slurry can be reduced, and the influence on other components in the ink can also be reduced.

As an alternative embodiment, the viscosity of the water-based pigment ink is 3.0cp to 5.0cp, specifically 3.0cp, 3.5cp, 4.0cp, 4.2cp, 4.45cp, 4.52cp, 4.53cp, 4.55cp, 4.58cp, 4.62cp, 4.8cp or 5.0cp, etc., but not limited to the values listed, and other values not listed in the range of values are also applicable. Preferably, the viscosity of the water-based pigment ink is 4.45cp to 4.80 cp.

As an alternative embodiment of the present application, the surface tension of the water-based pigment ink is 23mN/m to 30mN/m, and specifically 23mN/m, 24mN/m, 25mN/m, 26mN/m, 27mN/m, 28mN/m, 29mN/m, or 30mN/m, etc., but the present invention is not limited to the recited values, and other values not recited in the numerical range are also applicable. It is noted that the smoothness of the pigment ink can be improved by controlling the surface tension of the water-based pigment ink within the above range. Preferably, the surface tension of the water-based pigment ink is 25mN/m to 29mN/m

As an alternative embodiment of the present invention, the PH of the water-based pigment ink may be 7 to 10, specifically, 7, 7.2, 7.5, 7.8, 7.9, 8.1, 8.2, 8.5, 8.8, 9, 9.5, or 10, but is not limited to the above-mentioned values, and other values not listed in the above-mentioned value range are also applicable. Preferably, the pH of the water-based pigment ink is 7.0-8.2.

As a preferable technical scheme, the water-based pigment ink comprises the following components in percentage by weight: 10 to 35 percent of pigment color paste, 10 to 30 percent of aqueous organic solvent, 0.5 to 1.5 percent of polyvinylpyrrolidone, 0.5 to 1.5 percent of high molecular weight block copolymer dispersant containing pigment affinity group, 3 to 20 percent of aqueous resin, 2 to 3 percent of surfactant, 0.05 to 0.2 percent of bactericide and the balance of water.

The application provides a water base pigment ink has excellent high dispersion stability, keeps the not dry shower nozzle of long-time standby in the print head, and the smoothness nature of ink is good, and ink viscosity changes for a short time, has fine storage stability and printing performance stability.

In a second aspect, embodiments of the present application further provide a method for preparing a water-based pigment ink, including the following steps S01 to S02:

step S01, adding polyvinylpyrrolidone into deionized water, and uniformly stirring at a stirring speed of 500 rpm at 100-; then adding a high molecular weight block copolymer dispersant containing pigment affinity groups, a water-based organic solvent, a surfactant, a pH regulator and a bactericide, and uniformly stirring at a stirring speed of 100-; adding the aqueous resin, and uniformly stirring; adding pigment color paste, and stirring at the stirring speed of 100-500 rpm for 60-120min to obtain a mixed solution;

and step S02, filtering the mixed solution by using a filter membrane or a filter element with the diameter less than or equal to 0.6 micron to obtain the water-based pigment ink.

The water-based pigment ink comprises the following components in percentage by weight: 0.2 to 4 percent of polyvinylpyrrolidone, 0.5 to 2 percent of high molecular weight block copolymer dispersant containing pigment affinity group, 10 to 30 percent of aqueous organic solvent, 0.3 to 3 percent of surfactant, 0.1 to 1 percent of pH regulator, 0.05 to 0.2 percent of bactericide, 3 to 20 percent of aqueous resin and 10 to 35 percent of pigment color paste.

The preparation method of the water-based pigment ink is simple, and the production efficiency can be improved.

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 components mentioned above and below in the present application are weight percentages, and all the percentages are percentages of the components in the total weight of the pigment ink except for specific indications.

1. Preparation of aqueous pigment ink

Example 1:

the formulations of the components of examples 1-4 are shown in table 1, and the preparation method of example 1 comprises the following steps:

mixing the above aqueous solvents (diethylene glycol, glycerol and 2-pyrrolidone), surfactant (Surfynol 465: 1.3%, Dynol 604: 0.5%, AFCONA3580: 0.2%), polyvinylpyrrolidone PVPF-15: 1% of pigment affinity group-containing high molecular weight block copolymer dispersant BYK 190: 1.5%, pH regulator triethanolamine: 0.2 percent of bactericide and isothiazolinone are mixed and stirred evenly, and then waterborne polyurethane D-502 is added and stirred for 10 minutes at the stirring speed of 100-500 r/min; and finally adding Kelaien E5B-PT VP3565 red paste, stirring for 2 hours at the stirring speed of 100-500 rpm, standing for 1 hour after all the components are uniformly mixed, and filtering by a glass fiber filter membrane of 0.6 mu m to obtain the red ink-jet ink.

Examples 2 to 4 and comparative examples 1 to 5 were prepared according to the formulation in Table 1 and the above preparation method, respectively.

Wherein, the examples 1, 3 and 4 are red ink, and the example 2 is blue ink; comparative examples 1, 3, 4 and 5 are red inks, and comparative example 2 is a blue ink. The dispersants in the examples and comparative examples are all high molecular weight block copolymer dispersants containing pigment affinic groups.

TABLE 1

The water-based pigment inks prepared in examples 1 to 4 and comparative examples 1 to 5 of the present application were tested for physicochemical parameters of the ink at normal temperature and the ink after aging (60 ℃, 168 hours), respectively, including: pH, conductivity, surface tension, viscosity. The test instrument equipment used for the above physicochemical parameters is as follows:

model BPH-7200 laboratory PH meter Bell Analyzer Co., Ltd

(Bell analysis Instrument of BEC-6600 laboratory conductivity meter, Dalian Co., Ltd.)

(iii) BZY-1 full-automatic surface tension meter Shanghai balance instrument and meter factory

DV-II + Pro digital display viscometer American Bohler

The test results are shown in table 2 below:

TABLE 2

As can be seen from the test data in Table 2, the water-based pigment inks prepared in the embodiments 1 to 4 of the present application have excellent physical and chemical parameters after aging for 168 hours at 60 ℃, and have no obvious changes in surface tension and viscosity.

Comparative example 1 compared to the ink of example 1 without adding the high molecular weight block copolymer dispersant containing a pigment affinity group and polyvinylpyrrolidone, the surface tension of the normal ink was increased compared to example 1; also, the viscosity of the aged ink was greatly increased.

Comparative example 2 compared to the ink of example 2, in which the high molecular weight block copolymer dispersant containing a pigment affinity group was not added, the viscosity of the ink significantly increased after aging the normal ink at 60 ℃ for 168 hours.

Comparative example 3 the viscosity of the ink also increased significantly compared to example 1 without polyvinylpyrrolidone added alone. From this, it can be found that the pigment affinity group-containing high molecular weight block copolymer dispersant and polyvinylpyrrolidone in the ink need to be used in combination to effectively avoid the viscosity increase of the aged ink.

Further, in the ink prepared in comparative example 4, the weight ratio of the high molecular weight block copolymer containing a pigment affinity group to polyvinylpyrrolidone was 5:1, and the amount of polyvinylpyrrolidone added was small, and the viscosity of the ink after aging was significantly increased, and the ink did not reach better storage stability.

In the ink prepared in comparative example 5, the weight ratio of the high molecular weight block copolymer containing a pigment affinity group to polyvinylpyrrolidone was 1.5:2, i.e., the amount of polyvinylpyrrolidone (PVP) added was too large, and although the viscosity change was not large after aging of the ink, the viscosity of the ink was too high during normal use, the ink smoothness was decreased, and the printing effect was poor. Of course, the initial viscosity of the finished ink can be controlled by adjusting the addition amount of the organic solvent in the formula design, but this will affect the smoothness of the ink and the standby performance of the ink in the printer to some extent, and is not the optimal solution and choice.

The inks obtained in examples 1 to 4 and comparative examples 1 to 5 of the present application were subjected to a print smoothness test in a flying saucer 4720 broadloom printer (Zheng's New century digital science and technology Co., Ltd.), respectively, and the results are shown in the following Table 3:

TABLE 3

According to the data in table 3, it can be seen that the normal ink and the aged ink prepared in examples 1 to 4 of the present application have excellent printing fluency on the flying saucer 4720 wide format machine, and are not broken.

The normal ink prepared by the comparative examples 1-5 can be printed smoothly, but the ink after aging is extremely poor in smoothness, and the ink has defects in functional application of a printer.

In summary, the water-based pigment ink prepared by the method has excellent high dispersion stability, can obtain good storage stability and printing performance stability, and has good use value.

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. A water-based pigment ink, characterized in that it comprises the following components in percentage by weight: 10 to 35 percent of pigment color paste, 10 to 30 percent of aqueous organic solvent, 0.2 to 4 percent of polyvinylpyrrolidone, 0.5 to 2 percent of high molecular weight block copolymer dispersant containing pigment affinity group, 3 to 20 percent of aqueous resin and the balance of water; wherein the weight ratio of the pigment affinity group-containing high molecular weight block copolymer dispersant to the polyvinylpyrrolidone is 3: (1-3).

2. The water-based pigment ink according to claim 1, the aqueous organic solvent includes at least one of ethylene glycol, diethylene glycol, triethylene glycol, propylene glycol, glycerol, 1, 2-propylene glycol, pentanediol, 1, 2-hexanediol, n-propanol, isopropanol, diethylene glycol, triethylene glycol, tetraethylene glycol, polyethylene glycol 400, polyethylene glycol-600, polyethylene glycol-900, triethylene glycol monobutyl ether, glycerol ether, ethylene glycol monopropyl ether, ethylene glycol isopropyl ether, ethylene glycol monobutyl ether, ethylene glycol isobutyl ether, propylene glycol monomethyl ether, propylene glycol monoethyl ether, propylene glycol monopropyl ether, propylene glycol monobutyl ether, diethylene glycol monomethyl ether, diethylene glycol monoethyl ether, diethylene glycol monopropyl ether, triethylene glycol monobutyl ether, dipropylene glycol monomethyl ether, dipropylene glycol monoethyl ether, dipropylene glycol monopropyl ether, and 2-pyrrolidone.

3. The water-based pigment ink according to claim 1, comprising the following components in weight percent: 10 to 35 percent of pigment color paste, 10 to 30 percent of aqueous organic solvent, 0.5 to 1.5 percent of polyvinylpyrrolidone, 1 to 1.5 percent of high molecular weight block copolymer dispersant containing pigment affinity group, 3 to 20 percent of aqueous resin and the balance of water.

4. The water-based pigment ink according to claim 1 or 3, wherein the aqueous resin comprises at least one of polyurethane-based resin, acrylic resin, styrene-acrylic resin, and polyester-based resin.

5. The water-based pigment ink according to claim 1 or 3, further comprising the following components in weight percent: 0.3 to 3 percent of surfactant, 0.1 to 1 percent of pH regulator and 0.05 to 0.2 percent of bactericide.

6. The water-based pigment ink according to claim 5, wherein the surfactant comprises at least one of an acetylene glycol-based surfactant and a silicone-based surfactant.

7. The water-based pigment ink according to claim 5, wherein the bactericide is benzisothiazolinone.

8. The water-based pigment ink of claim 5, wherein the pH adjuster comprises at least one of triethanolamine, diethanolamine, ammonia, and 2-amino-2-methyl-1-propanol.

9. The water-based pigment ink according to claim 1, wherein the water-based pigment ink satisfies at least one of the following characteristics a to d:

a. the viscosity of the ink is 3.0 cp-5.0 cp;

b. the surface tension of the ink is 23 mN/m-30 mN/m;

c. the conductivity of the ink is 0.2 ms/cm-1.5 ms/cm;

d. the pH value of the ink is 7-10.

10. A method of making a water-based pigment ink, comprising the steps of:

sequentially adding the following components in percentage by weight into water: 0.2 to 4 percent of polyvinylpyrrolidone, 0.5 to 2 percent of high molecular weight block copolymer dispersant containing pigment affinity groups, 10 to 30 percent of aqueous organic solvent, 0.3 to 3 percent of surfactant, 0.1 to 1 percent of pH regulator, 0.05 to 0.2 percent of bactericide, 3 to 20 percent of aqueous resin and 10 to 35 percent of pigment color paste are stirred to obtain mixed solution;

and filtering the mixed solution by using a filter membrane or a filter element with the diameter less than or equal to 0.6 micron to obtain the water-based pigment ink.