CN115044249A

CN115044249A - Water-based pigment ink

Info

Publication number: CN115044249A
Application number: CN202210715716.4A
Authority: CN
Inventors: 黄新红
Original assignee: Zhuhai Ninestar Management Co Ltd
Current assignee: Zhuhai Ninestar Management Co Ltd
Priority date: 2022-06-22
Filing date: 2022-06-22
Publication date: 2022-09-13
Anticipated expiration: 2042-06-22
Also published as: CN115044249B

Abstract

The application relates to water-based pigment ink, which comprises the following components in percentage by weight: 15-40% of pigment color paste, water-soluble organic solvent, 0.1-2% of compound shown in formula (I) and the balance of water, wherein the water-soluble organic solvent comprises the following components in percentage by mass: 1, the total mass of the 2-pyrrolidone and the hydroxyethyl pyrrolidone in the pigment ink is 10-30%.

Description

Water-based pigment ink

Technical Field

The invention relates to the technical field of printing, in particular to water-based pigment ink.

Background

The ink-jet printing technology is a new printing technology without contact, pressure and printing plate, and can input the information stored in an electronic computer into an ink-jet printer to realize printing. The ink jet printer can be divided into a solid ink jet printer and a liquid ink jet printer according to the working principle, the liquid ink jet printer mainly comprises a thermal bubble printer and a micro-piezoelectric printer, and the liquid ink jet printer has the advantages of low price, simplicity in operation, vivid color, rich color and the like, is the most popular image output equipment at present, and becomes the main choice in offices and families. With the continuous development of liquid ink-jet printer technology, in order to further save cost, the ink-jet ink can be compatibly applied to a sponge-free recovery box and a compatible ink box of a thermal bubble printer, however, the problems of jet orifice missing, printing disconnection, ink missing and the like easily occur in the ink-jet ink in the using process.

Therefore, there is an urgent need to improve the moisture retention and printing smoothness of the existing ink so that it can be applied to a thermal bubble printer.

Disclosure of Invention

In view of the above, the present application provides an aqueous pigment ink, which has the advantages of good printing fluency, high stability and good moisture retention, and is applied to a thermal bubble printer to print sharp, clear and less rough edges of characters, and the phenomena of line breaking and ink shortage will not occur.

In a first aspect, an embodiment of the present application provides an aqueous pigment ink, which includes the following components in percentage by weight: 15 to 40 percent of pigment color paste, water-soluble organic solvent, 0.1 to 2 percent of compound shown in formula (I) and the balance of water;

wherein the water-soluble organic solvent comprises the following components in a mass ratio of 1:1, wherein the total mass of the 2-pyrrolidone and the hydroxyethyl pyrrolidone in the pigment ink is 10-30%;

in one possible embodiment, the water-soluble organic solvent further includes at least one of glycerin, ethylene glycol, propylene glycol, 1, 2-hexanediol, 1, 2-glycerol, 1, 2-propanediol, diethylene glycol, triethylene glycol, 1, 3-butanediol, 2, 3-butanediol, 1, 4-butanediol, and N-methyl-2-pyrrolidone.

In one possible embodiment, the water-soluble organic solvent includes glycerin, and the glycerin is 5% to 15% by mass of the pigment ink.

In one possible embodiment, the pigment comprises a black organic pigment.

In a possible embodiment, the pigment ink further comprises a surfactant, and the mass ratio of the surfactant in the pigment ink is 0.1-0.5%.

In one possible embodiment, the surfactant includes at least one of a polysiloxane-based compound including an organically modified polysiloxane-based surfactant and a polyether-modified siloxane-based surfactant, and a surfactant containing an acetylene glycol group.

In one possible embodiment, the pigment ink further comprises a resin, and the mass ratio of the resin in the pigment ink is 1% to 10%.

In one possible embodiment, the 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 a possible embodiment, the pigment ink further comprises a preservative, and the preservative accounts for 0.1 to 1 percent of the mass of the pigment ink.

In one possible embodiment, the pigmented ink has a viscosity of 2.0 to 4.0mPa · s and a surface tension of 25 to 40 mN/m.

The invention has the beneficial effects that: the water-based pigment ink is added with 10-30% of 2-pyrrolidone and hydroxyethyl pyrrolidone by mass, and the mass ratio of the 2-pyrrolidone to the hydroxyethyl pyrrolidone is 1: after 0.1-2% by mass of the dodecanol polyoxyethylene polyoxypropylene ether compound shown in the formula (I), the viscosity of the aqueous pigment ink is 2.0-4.0 mPa.s, the surface tension is 25-40 mN/m, and when the aqueous pigment ink is printed in a thermal bubble printer, the printed characters of the ink are sharp, clear, less in burrs, good in fluency, and free of line breakage and ink shortage; the ink has good moisture retention, can be printed after waiting for 7 days, can be continuously printed and does not block the spray head.

Detailed Description

While the following is a preferred embodiment of the present invention, it should be noted that, for those skilled in the art, various modifications and decorations can be made without departing from the principle of the embodiment of the present invention, and these modifications and decorations should also be regarded as the protection scope of the embodiment of the present invention.

The terminology used in the embodiments of the invention is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. As used in the examples of the present invention and the appended claims, the singular forms "a," "an," and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise.

The thermal foaming ink-jet printing technology is that ink generates bubbles by heating a nozzle, and the bubbles extrude the ink to be sprayed on a printing substrate, and belongs to a high-temperature high-pressure printing technology. When the existing thermal foaming printer is used, the used ink needs to be heated and is carried out under a high-pressure condition, and the printed characters are easy to have the problems of unsharpness and burr; in addition, the ink is ejected through the air bubbles, the directionality and the volume of ink droplets are not easy to control, the edges of printed lines are easy to be uneven, and the printing quality is influenced to a certain extent.

Accordingly, the present application provides an aqueous pigment ink comprising the following components in weight percent: 15 to 40 percent of pigment color paste, water-soluble organic solvent, 0.1 to 2 percent of compound shown in formula (I) and the balance of water;

wherein the water-soluble organic solvent comprises the following components in a mass ratio of 1:1, the total mass of the 2-pyrrolidone and the hydroxyethyl pyrrolidone in the pigment ink is 10-30%.

In the technical scheme, 2-pyrrolidone and hydroxyethyl pyrrolidone with the total mass ratio of 10-30% are added into the water-based pigment ink, and the mass ratio of the 2-pyrrolidone to the hydroxyethyl pyrrolidone is 1:1, 0.1% -2% of dodecanol polyoxyethylene polyoxypropylene ether compound shown in formula (I) by mass percentage, so that the water-based pigment ink is good in waterproof and sun-proof performance, good in moisture retention and printing fluency, the printing nozzle is started to print after being standby for 7 days, the ink can be continuously printed without blocking the nozzle, printed characters are sharp and clear, burrs are few, and the problems of character breaking and ink shortage can be avoided.

The compound represented by the formula (I) may be a dodecanol polyoxyethylene polyoxypropylene ether compound, and the mass ratio thereof in the pigment ink may be specifically 0.1%, 0.3%, 0.5%, 0.7%, 0.9%, 1%, 1.5%, 1.8%, and 2%, but is not limited to the enumerated values, and other non-enumerated values within this range are also applicable. The mass ratio of the compound selected from the compounds shown in the formula (I) in the pigment ink is controlled within the range, so that the surface tension of the ink can be effectively reduced, the smoothness of the pigment ink is improved, and the phenomena of line breakage and ink shortage of the ink in the printing process are avoided. If the mass ratio of the compound shown in the formula (I) in the pigment ink is less than 0.1%, the ink is easy to have the problems of jet orifice missing and ink shortage after waiting for 7 days; if the mass ratio of the compound represented by the formula (i) in the pigment ink is more than 2%, the ink is liable to have a problem of disconnection during printing.

The total mass ratio of 2-pyrrolidone and hydroxyethylpyrrolidone added to the pigment ink as a water-soluble organic solvent may be, for example, 10%, 13%, 15%, 18%, 20%, 22%, 25%, 27%, 29% and 30% in the pigment ink, but is not limited to the enumerated values, and other values not enumerated within the numerical range are also applicable. The total mass ratio of the 2-pyrrolidone and the hydroxyethyl pyrrolidone is controlled in the range, so that the moisture retention performance of the ink can be effectively improved, the problems of sharp and clear printed characters, few burrs, no blockage and no loss of a spray head of the ink in the process can be guaranteed, and the problem of line breakage of the ink in the printing process can be solved in the actual application process.

Further, in order to solve the problem of line breakage of ink during printing, the applicant found that: mixing 2-pyrrolidone and hydroxyethyl pyrrolidone in a mass ratio of 1:1, the fluency of the ink in the process can be ensured, and the problem of line breakage can not occur.

As an alternative embodiment of the present invention, other water-soluble organic solvents such as glycerin, ethylene glycol, propylene glycol, 1, 2-hexanediol, 1, 2-glycerol, 1, 2-propanediol, diethylene glycol, triethylene glycol, 1, 3-butanediol, 2, 3-butanediol, 1, 4-butanediol, and N-methyl-2-pyrrolidone may be added to the pigment ink, and the dispersion stability of the pigment in the ink may be improved by adding the above solvents to the pigment ink.

Preferably, glycerin is added to the pigment ink, and the mass ratio of glycerin in the pigment ink is 5% to 15%, specifically 5%, 6%, 7%, 8%, 9%, 10%, 12% and 15%, but not limited to the recited values, and other values not recited in the range of the values are also applicable. Glycerin has excellent water retentivity, a high boiling point, and is difficult to volatilize, and the moisture retentivity of the pigment ink can be improved by controlling the mass ratio of glycerin within the above range.

It will be understood that when the pigment ink includes glycerol, the solvents in the pigment ink include glycerol, 2-pyrrolidone, and hydroxyethyl pyrrolidone. Namely, the water-based pigment ink comprises the following components in percentage by weight: 15-40% of pigment color paste, 5-15% of glycerol, 10-30% of 2-pyrrolidone and hydroxyethyl pyrrolidone, 0.1-2% of compound shown in formula (I) and the balance of water, wherein the mass ratio of the 2-pyrrolidone to the hydroxyethyl pyrrolidone is 1: 1.

as an alternative technical scheme of the application, the pigment color paste comprises black organic pigment. Typically, and without limitation, the black organic pigment may be pigment black 7, pigment black 11, and the like. The pigment in the pigment color paste is selected, so that the weather resistance and the color saturation of the water-based pigment ink can be improved.

As an alternative embodiment of the present application, the mass ratio of the black pigment in the pigment ink is 15% to 40%, specifically 5%, 6%, 9%, 15%, 18%, 23%, 30%, 35% and 40%, but is not limited to the recited values, and other values not recited in the range of the values are also applicable.

As an alternative solution, the pigment ink may further comprise a surfactant.

The surfactant includes at least one of a modified siloxane-based surfactant selected from an organic modified siloxane-based surfactant and a polyether modified siloxane-based surfactant, and the surfactant containing an acetylene glycol group illustratively includes a surfactant containing 2,4, 7, 9-tetramethyl-5-decyne-4, 7-diol, a surfactant containing 3, 6-dimethyl-4-octyne-3, 6-diol, a surfactant containing 3, 5-dimethyl-1-hexyne-3-ol, and the like. Specifically, the surfactant may be selected from at least one of S μ rfynol 104, S μ rfynol 82, S μ rfynol 465 and S μ rfynol 485 (Air Prod μ cts Co., Ltd., U.S.). Preferably, the surfactant is selected from at least one of S μ rfynol 104 and S μ rfynol 465. The surfactant is helpful for reducing the surface tension of the ink and increasing the printing fluency of the ink.

As an alternative embodiment of the present application, the surfactant may be present in the pigment ink in a ratio of 0.1% to 0.5%, specifically 0.1%, 0.2%, 0.3%, 0.4% and 0.5% by weight, but the present invention is not limited to the above-mentioned values, and other values not shown in the above-mentioned range are also applicable. The mass ratio of the surfactant is controlled within the range, so that the surface tension of the ink is reduced, and the printing smoothness of the ink is enhanced.

As an alternative embodiment of the present application, a resin may be added to the aqueous pigment ink.

The resin is at least one selected from the group consisting of polyurethane resin, acrylic resin, styrene-acrylic resin, and polyester resin. Preferably, the resin is selected from polyurethane-based resins.

As an alternative embodiment of the present application, the ratio of the resin to the pigment ink may be 1% to 10% by mass, specifically 1%, 3%, 4%, 5%, 6%, 7%, 8%, 9% and 10% by mass, but is not limited to the above-mentioned values, and other values not listed in the above-mentioned range are also applicable.

As an alternative solution of the present application, the aqueous pigment ink may further include a preservative to prevent the organic substances and the like contained in the ink raw materials from rotting and growing mold in a humid environment, wherein the preservative includes PROXEL GXL.

In an alternative embodiment of the present invention, the ratio of the preservative to the pigment ink is 0.1% to 1% by mass, and specifically may be 0.1%, 0.2%, 0.3%, 0.4%, 0.5%, 0.6%, 0.7%, 0.8%, 0.9%, and 1%, but is not limited to the values listed, and other values not listed in the range of values are also applicable.

As an alternative solution, the balance of 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 pigment can be reduced, and the influence on other components in the ink can also be reduced.

As an alternative embodiment of the present application, the viscosity of the aqueous pigment ink of the present application is 2.0mPa · s to 4.0mPa · s, and the viscosity of the aqueous pigment ink may be specifically 2.0mPa · s, 2.2 mPa · s, 2.5 mPa · s, 2.8 mPa · s, 3 mPa · s, 3.1 mPa · s, 3.2 mPa · s, 3.5 mPa · s, and 4.0mPa · s, but is not limited to the values listed, and other values not listed within the range of the values are also applicable. The pigment ink with the viscosity is suitable for a nozzle of a hot bubble printer, ink can not be dripped, ink supply is not smooth, and the ink printing smoothness is excellent.

As an alternative embodiment of the present application, the aqueous pigmented inks of the present application have a surface tension of from 25mN/m to 40mN/m, in particular 25mN/m, 26mN/m, 27mN/m, 28mN/m, 29mN/m, 30mN/m, 31mN/m, 32mN/m, 33mN/m, 34mN/m, 37mN/m, 39mN/m and 40mN/m, but are not limited to the values listed, and other values not listed in this range of values are equally applicable. The surface tension of the pigment ink is controlled within the range, and the water-based pigment ink has good printing fluency in a thermal bubble printer and has no phenomena of line breakage and ink shortage.

As an alternative technical scheme of the application, the water-based pigment ink comprises the following components in percentage by weight: 15-40% of black pigment color paste, 5-15% of glycerol, 10-30% of 2-pyrrolidone and hydroxyethyl pyrrolidone, 1-10% of resin, 0.1-0.5% of surfactant, 0.1-1% of preservative, 0.1-2% of compound shown in formula (I) and the balance of water, wherein the mass ratio of the 2-pyrrolidone to the hydroxyethyl pyrrolidone is 1: 1.

the application provides a water pigment ink has good moisture retention, smoothness and waterproof resistance to sunlight, and the water pigment ink of this application can use on the hot bubble printer, prints the shower nozzle and waits 7 days later the start-up to print, and the ink can not block up the shower nozzle by the continuity printing.

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 invention are weight percentages, and all the percentages are percentages of the total weight of the pigment ink except for specific indications.

1. EXAMPLES formulation of aqueous pigment inks

Example 1: the water-based pigment ink comprises the following components in percentage by mass: pigment black 7, color paste 25%, glycerin 5%, 2-pyrrolidone 8%, hydroxyethyl pyrrolidone 8%, dodecanol polyoxyethylene polyoxypropylene ether 0.5%, acetylene glycol surfactant 0.3%, preservative 0.1% -1% and the balance of water.

2. Formulation of comparative example aqueous pigment ink

Comparative example 1: unlike example 1, the total mass ratio of 2-pyrrolidone and hydroxyethyl pyrrolidone in the aqueous pigment ink is less than 10%.

Comparative example 2: unlike example 1, the total mass of 2-pyrrolidone and hydroxyethyl pyrrolidone in the aqueous pigment ink is more than 30%.

Comparative example 3: unlike example 1, the mass ratio of dodecanol polyoxyethylene polyoxypropylene ether in the aqueous pigment ink was less than 0.1%.

Comparative example 4: unlike example 1, the mass ratio of dodecanol polyoxyethylene polyoxypropylene ether in the aqueous pigment ink was more than 2%.

Comparative example 5: unlike example 1, the mass ratio of 2-pyrrolidone in the aqueous pigment ink was 4%; the mass ratio of the hydroxyethyl pyrrolidone in the aqueous pigment ink is 12%.

The specific components and their component contents of the above examples and comparative examples are specifically shown in Table 1.

TABLE 1 Components and their contents of examples and comparative examples

The aqueous pigment inks prepared in the above examples and comparative examples were subjected to a test for printed characters, a test for printer standby, and a test for print smoothness, respectively, and the test results are shown in table 2 below:

TABLE 3 Performance testing of examples and comparative examples

As can be seen from the data in tables 1-2:

aqueous pigment ink of comparative example 1: the 2-pyrrolidone and the hydroxyethyl pyrrolidone are added in a mass ratio of 1:1, and the total mass ratio of the 2-pyrrolidone and the hydroxyethyl pyrrolidone in the aqueous pigment ink is less than 10%, so that the problems of no sharp characters and more burrs occur in the printing test process, the pigment ink is poor in fluency, and the test page breaks more in the printing process.

Aqueous pigment ink of comparative example 2: the 2-pyrrolidone and the hydroxyethyl pyrrolidone are added in a mass ratio of 1:1, the total mass ratio of the 2-pyrrolidone and the hydroxyethyl pyrrolidone in the aqueous pigment ink is more than 30%, the moisture retention and the fluency of the pigment ink are poor, the jet orifice is seriously lacked in the printing process, and the problem of lacking ink in a test page exists.

Aqueous pigment ink of comparative example 3: the mass ratio of the dodecanol polyoxyethylene polyoxypropylene ether in the water-based pigment ink is less than 0.1%, the pigment ink is poor in smoothness, and the phenomenon of test page broken lines exists in the printing process.

In the aqueous pigment ink of comparative example 4, the mass ratio of the dodecanol polyoxyethylene polyoxypropylene ether in the aqueous pigment ink is more than 2%, the pigment ink has poor moisture retention and fluency, and the ink shortage problem of the test page exists due to serious orifice deletion in the printing process.

In the aqueous pigment ink of comparative example 5, 2-pyrrolidone and hydroxyethyl pyrrolidone were added in a ratio of 1:3, and the total mass ratio of 2-pyrrolidone and hydroxyethyl pyrrolidone in the aqueous pigment ink was between 10% and 30%, the pigment ink was poor in smoothness, and there were many page breaks during printing.

In summary, the aqueous pigment ink of the present application is added with 10% to 30% of 2-pyrrolidone and hydroxyethyl pyrrolidone by total mass, and the mass ratio of the 2-pyrrolidone to the hydroxyethyl pyrrolidone is 1:1 and the content of the dodecanol polyoxyethylene polyoxypropylene ether shown in the formula (I) is 0.1-2%, so that the viscosity of the water-based pigment ink is 2.0-4.0 mPa.s, the surface tension is 25-40 mN/m, and when the water-based pigment ink is printed in a thermal bubble printer, the printed characters of the ink are sharp, the ink is clear, has few burrs and has good smoothness, and the phenomena of line breaking and ink shortage are avoided; the ink has good moisture retention, can be printed after waiting for 7 days, can be continuously printed and does not block the spray head.

The present invention is not limited to the above preferred embodiments, and any modifications, equivalent substitutions, improvements, etc. made within the spirit and principle of the present invention should be included in the scope of the present invention.

Claims

1. The water-based pigment ink is characterized by comprising the following components in percentage by weight: 15 to 40 percent of pigment color paste, water-soluble organic solvent, 0.1 to 2 percent of compound shown in formula (I) and the balance of water;

2. the aqueous pigment ink of claim 1, wherein the water-soluble organic solvent further comprises at least one of glycerol, ethylene glycol, propylene glycol, 1, 2-hexanediol, 1, 2-propanetriol, 1, 2-propanediol, diethylene glycol, triethylene glycol, 1, 3-butanediol, 2, 3-butanediol, 1, 4-butanediol, and N-methyl-2-pyrrolidone.

3. The pigment ink according to claim 2, wherein the water-soluble organic solvent comprises glycerin, and the glycerin is present in the pigment ink in an amount of 5 to 15% by mass.

4. The aqueous pigmented ink of claim 1 wherein the pigment comprises a black organic pigment.

5. The aqueous pigment ink according to claim 1, further comprising a surfactant, wherein the surfactant is present in the pigment ink in a proportion of 0.1 to 0.5% by mass.

6. The aqueous pigment ink according to claim 5, wherein the surfactant comprises at least one of a polysiloxane compound comprising an organically modified polysiloxane surfactant and a polyether modified siloxane surfactant, and a surfactant containing an acetylene glycol group.

7. The aqueous pigment ink according to claim 1, wherein the pigment ink further comprises a resin, and the mass ratio of the resin in the pigment ink is 1-10%.

8. The aqueous pigment ink according to claim 7, wherein the resin comprises at least one of a polyurethane-based resin, an acrylic resin, a styrene-acrylic resin, and a polyester-based resin.

9. The aqueous pigmented ink of claim 1 further comprising a preservative in an amount of 0.1% to 1% by weight of the pigmented ink.

10. The aqueous pigmented ink of claim 1 wherein the pigmented ink has a viscosity of 2.0 to 4.0 mPa-s and a surface tension of 25 to 40 mN/m.