CN115044249B

CN115044249B - Water-based pigment ink

Info

Publication number: CN115044249B
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: 2023-09-01
Anticipated expiration: 2042-06-22
Also published as: CN115044249A

Abstract

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

Description

Water-based pigment ink

Technical Field

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

Background

The ink jet printing technology is a new non-contact, non-pressure and non-printing technology, and can input the information stored in the electronic computer into the 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, wherein the liquid ink-jet printer mainly comprises a thermal bubble printer and a micro-piezoelectric printer, and in contrast, the liquid ink-jet printer has the advantages of low price, simplicity in operation, vividness in color, rich colors and the like, is the most popular image output equipment at present, and has become the main choice for offices and families. Along with the continuous development of the liquid ink-jet printer technology, in order to further save the 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 nozzle missing, printing broken lines, ink shortage and the like easily occur in the use process of the ink-jet ink.

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 smoothness, high stability and good moisture retention, and can be applied to a thermal bubble printer to print sharp, clear and little burr words, and the phenomena of broken lines and ink shortage can not occur.

In a first aspect, embodiments of the present application provide an aqueous pigment ink comprising the following components in weight percent: 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, wherein the total mass ratio 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 glycerol, 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 mass ratio of the glycerin in the pigment ink is 5% to 15%.

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

In one possible embodiment, the pigment ink further comprises a surfactant, wherein 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 organic 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% -10%.

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

In one possible embodiment, the pigment ink further comprises a preservative, wherein the mass ratio of the preservative in the pigment ink is 0.1% -1%.

In one possible embodiment, the viscosity of the pigment ink is 2.0 mPas to 4.0 mPas and the surface tension of the pigment ink is 25mN/m to 40mN/m.

The beneficial effects of the application are as follows: the water-based pigment ink is added with 2-pyrrolidone and hydroxyethyl pyrrolidone accounting for 10-30% of the total mass ratio, and the mass ratio of the 2-pyrrolidone to the hydroxyethyl pyrrolidone is 1: after the dodecanol polyoxyethylene polyoxypropylene ether compound shown in the formula (I) with the mass ratio of 0.1-2%, the viscosity of the aqueous pigment ink is 2.0 mPa.s-4.0 mPa.s, the surface tension is 25 mN/m-40 mN/m, and when the ink is printed in a thermal bubble printer, the printing characters of the ink are sharp, clear, less in burrs, good in fluency and free of broken lines and ink deficiency; the ink has good moisture retention, and can be printed after being standby for 7 days, and the ink can be continuously printed without blocking the spray head.

Detailed Description

The following description is of the preferred embodiments of the present application, and it should be noted that, for those skilled in the art, it is possible to make several improvements and modifications without departing from the principle of the embodiments of the present application, and these improvements and modifications should also be regarded as the protection scope of the embodiments of the present application.

The terminology used in the embodiments of the application is for the purpose of describing particular embodiments only and is not intended to be limiting of the application. As used in this application 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 to heat the nozzle to make ink produce bubble to extrude ink to print onto the base material. In the use process of the existing thermal foaming printer, the used ink needs to be heated and is carried out under the high-pressure condition, and the printed characters are easy to have the problems of sharpness and burrs; in addition, ink is ejected through bubbles, the directionality and the volume of ink droplets are not well controlled, the edges of printing lines are easily scattered, and the printing quality is affected to a certain extent.

Accordingly, the application provides an aqueous pigment ink comprising the following components in weight percent: 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 and hydroxyethyl pyrrolidone, the total mass ratio of the 2-pyrrolidone and the hydroxyethyl pyrrolidone in the pigment ink is 10-30%.

In the technical scheme, 2-pyrrolidone and hydroxyethyl pyrrolidone accounting for 10-30% of the total mass ratio are added into the water-based pigment ink, and the mass ratio of the 2-pyrrolidone to the hydroxyethyl pyrrolidone is 1: after the dodecanol polyoxyethylene polyoxypropylene ether compound shown in the formula (I) with the mass ratio of 0.1% -2%, the water-based pigment ink has good waterproof and sun-proof properties, good moisturizing property and printing smoothness, the printing nozzle is started to print after standby for 7 days, the nozzle can not be blocked by continuous printing of the ink, and the printed characters are sharp, clear and free of burrs, and the problems of word breaking and ink deficiency are 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 recited values, and other non-recited values within the range of values are equally applicable. The mass ratio of the compound shown in the formula (I) in the pigment ink is controlled in 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 problem of missing spray holes and ink shortage easily occurs in the ink after the ink stands by 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 suffer from the problem of line breakage during printing.

The total mass ratio of 2-pyrrolidone and hydroxyethyl pyrrolidone in the pigment ink may be, for example, 10%, 13%, 15%, 18%, 20%, 22%, 25%, 27%, 29% and 30% as the water-soluble organic solvent, but is not limited to the recited values, and other non-recited values within the range are equally applicable. The total mass ratio of the 2-pyrrolidone and the hydroxyethyl pyrrolidone is controlled within the range, so that the moisturizing performance of the ink can be effectively improved, the problems of sharp and clear printing characters, less burrs, no blockage of a spray head and no loss of the ink in the process can be ensured, and the problem of broken lines of the ink in the printing process is easily caused in the actual application process.

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

As an alternative solution of the present application, other water-soluble organic solvents may be added to the pigment ink, for example, glycerin, ethylene glycol, propylene glycol, 1, 2-hexanediol, 1, 2-glycerin, 1, 2-propanediol, diethylene glycol, triethylene glycol, 1, 3-butanediol, 2, 3-butanediol, 1, 4-butanediol, and N-methyl-2-pyrrolidone, and the above solvents may be added to the pigment ink to improve the dispersion stability of the pigment in the ink, and it is understood that the above solvents may be used singly or in combination of two or more.

Preferably, glycerin is added to the pigment ink in a mass ratio of 5% to 15% in the pigment ink, specifically 5%, 6%, 7%, 8%, 9%, 10%, 12% and 15%, but the present application is not limited to the recited values, and other non-recited values in the range are equally applicable. Glycerin has excellent water retention properties, a high boiling point, and is less likely to volatilize, and the mass ratio of glycerin is controlled within the above range, thereby improving the moisture retention properties of the pigment ink.

It is understood that when glycerol is included in the pigment ink, the solvent in the pigment ink includes 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 a compound shown in a 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 solution of the application, the pigment paste comprises a black organic pigment. Typically, and not by way of limitation, the black organic pigment may be pigment black 7, pigment black 11, and the like. The application selects the pigment in the pigment color paste, 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 may be 15% to 40%, specifically 5%, 6%, 9%, 15%, 18%, 23%, 30%, 35% and 40%, but is not limited to the recited values, and other non-recited values within the range are equally applicable.

As an alternative technical scheme of the application, a surfactant is also added into the pigment ink.

The surfactant includes at least one of a modified silicone-based surfactant and an acetylene glycol group-containing surfactant, and the modified silicone-based surfactant is selected from an organic modified silicone-based surfactant and a polyether modified silicone-based surfactant, and exemplary surfactants containing an acetylene glycol group include 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 at least one selected from the group consisting of S.mu.rfynol 104, S.mu.rfynol 82, S.mu.rfynol 465, and S.mu.rfynol 485 (Air Prod. Cts Co., ltd.). Preferably, the surfactant is selected from at least one of S.mu.rfynol 104 and S.mu.rfynol 465. The surfactant is helpful for reducing the surface tension of the ink and increasing the printing smoothness of the ink.

As an alternative embodiment of the present application, the mass ratio of the surfactant in the pigment ink is 0.1% to 0.5%, specifically, may be 0.1%, 0.2%, 0.3%, 0.4% and 0.5%, but is not limited to the recited values, and other non-recited values within the range are equally 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 technical scheme of the application, resin can be added into the water-based pigment ink.

The resin is at least one selected from 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 mass ratio of the resin in the pigment ink may be 1% to 10%, specifically 1%, 3%, 4%, 5%, 6%, 7%, 8%, 9% and 10%, but is not limited to the recited values, and other non-recited values within the range are equally applicable.

As an alternative technical scheme of the application, substances such as organic matters and the like contained in the ink raw material are easy to rot and mildew in a wet environment, and the aqueous pigment ink further comprises a preservative for preventing the rot, wherein the preservative comprises PROXEL GXL.

As an alternative embodiment of the present application, the mass ratio of the preservative in the pigment ink may be 0.1% to 1%, specifically 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 recited values, and other non-recited values within the range are equally applicable.

As an alternative technical scheme of the application, the balance of 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 pigment can be reduced, and the influence on other components in the ink can be reduced.

The viscosity of the aqueous pigment ink of the present application may be 2.0 mPa.s to 4.0 mPa.s, and the viscosity of the aqueous pigment ink may be specifically 2.0 mPa.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, or 4.0 mPa.s, but the present application is not limited to the above values, and other values not shown in the above numerical ranges may be similarly applied. The pigment ink with the viscosity is suitable for a nozzle of a thermal bubble printer, does not drip ink, does not cause unsmooth ink supply, and ensures that the ink printing smoothness is excellent.

As an alternative embodiment of the present application, the surface tension of the aqueous pigment ink of the present application is 25mN/m to 40mN/m, specifically 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 is not limited to the recited values, and other non-recited values within the range of the 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 smoothness in a thermal bubble printer and has no phenomena of broken lines 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 as a formula (I) and the balance of water, wherein the mass ratio of the 2-pyrrolidone to the hydroxyethyl pyrrolidone is 1:1.

the water-based pigment ink provided by the application has good moisture retention, smoothness and waterproof and sun-proof properties, can be applied to a thermal bubble printer, is started to print after a printing nozzle stands by for 7 days, and can be continuously printed without blocking the nozzle.

The following examples are provided to further illustrate embodiments of the application. The embodiments of the present application are not limited to the following specific embodiments. The modification can be appropriately performed within the scope of protection.

The percentages of the components mentioned above and below are weight percentages, and the percentages of the components are percentages of the total weight of the pigment ink except for the specific descriptions.

1. Examples preparation 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 water.

2. Comparative example aqueous pigment ink configuration

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

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

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

Comparative example 4: unlike example 1, the mass ratio of the 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 the content of the components of the above examples and comparative examples are shown in Table 1.

TABLE 1 Components of examples and comparative examples and their contents

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

TABLE 3 Performance test of examples and comparative examples

From the data in tables 1 and 2 above, it can be seen that:

in the 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 unsharpness and more burrs of characters occur in the printing test process, the smoothness of the pigment ink is poor, and the number of broken lines of test pages in the printing process is large.

In the aqueous pigment ink of comparative example 2: 2-pyrrolidone and hydroxyethyl pyrrolidone are added in a mass ratio of 1:1, the total mass ratio of 2-pyrrolidone and hydroxyethyl pyrrolidone in the aqueous pigment ink is more than 30%, the pigment ink is poor in moisture retention and smoothness, the defect of spray holes is serious in the printing process, and the problem of test page ink shortage exists.

In the 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 smoothness of the pigment ink is poor, and the phenomenon of broken test page 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 moisture retention and the smoothness of the pigment ink are poor, the lack of spray holes is serious in the printing process, and the problem of ink shortage of test pages exists.

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 smoothness of the pigment ink was poor, and there were many broken test sheets in the printing process.

In summary, 2-pyrrolidone and hydroxyethyl pyrrolidone with a total mass ratio of 10% -30% are added into the aqueous pigment ink, and the mass ratio of 2-pyrrolidone to hydroxyethyl pyrrolidone is 1: after the content of the dodecanol polyoxyethylene polyoxypropylene ether shown in the formula (I) and the formula (1) is 0.1-2%, the viscosity of the aqueous pigment ink is 2.0 mPa.s-4.0 mPa.s, the surface tension is 25 mN/m-40 mN/m, and when the ink is printed in a thermal bubble printer, the printing characters of the ink are sharp, the clear and less burr and the smoothness are good, and the phenomena of broken lines and ink deficiency are avoided; the ink has good moisture retention, and can be printed after being standby for 7 days, and the ink can be continuously printed without blocking the spray head.

The foregoing description of the preferred embodiments of the application is not intended to be limiting, but rather is intended to cover all modifications, equivalents, alternatives, and improvements that fall within the spirit and scope of the application.

Claims

1. An aqueous pigment ink, characterized in that the aqueous pigment ink comprises the following components in percentage by weight: 15-40% of pigment color paste, 0.1-2% of water-soluble organic solvent selected from compounds shown in a formula (I) and the balance of water;

wherein the compound shown in the formula (I) is a dodecanol polyoxyethylene polyoxypropylene ether compound, and the water-soluble organic solvent comprises the following components in percentage by mass: 1, wherein the total mass ratio of the 2-pyrrolidone and the hydroxyethyl pyrrolidone in the pigment ink is 10% -30%, and the viscosity of the pigment ink is 2.0 mPa.s~4.0 mPa.s;

（Ⅰ）。

2. the aqueous pigment ink according to claim 1, wherein the water-soluble organic solvent further comprises at least one of glycerin, ethylene glycol, propylene glycol, 1, 2-hexanediol, 1, 2-glycerin, 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 mass ratio of the glycerin in the pigment ink is 5% -15%.

4. The aqueous pigment 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 mass ratio of the surfactant in the pigment ink is 0.1% -0.5%.

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

7. The aqueous pigment ink according to claim 1, further comprising a resin, wherein 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 polyurethane-based resin, acrylic resin, styrene-acrylic resin, and polyester-based resin.

9. The aqueous pigment ink according to claim 1, further comprising a preservative, wherein the preservative accounts for 0.1% -1% of the pigment ink by mass.

10. The aqueous pigment ink according to claim 1, wherein the pigment ink has a surface tension of 25mN/m to 40mN/m.