TW201534666A - An aqueous ink jet ink composition - Google Patents

Abstract

The present invention provides an aqueous ink jet ink composition, at least comprising: a water dispersible pigment paste, a hydroxyl-containing organic solvent, an aqueous resin emulsion, an aqueous emulsifying wax, a surface active agent and the water. The aqueous ink jet ink is specifically an aqueous ink jet ink composition which can be applied to a medium which is low in cost, has no ink-receptive coatings, and requires no pre-coating treatment, providing dried graphics that are water resistant, light resistant and scratch resistant.

Description

Aqueous inkjet ink composition

The present invention relates to an inkjet ink composition, and more particularly, to an aqueous inkjet ink composition, which can be applied to an inkjet printer for low-cost, non-absorbent coating without prior coating treatment. On the paper or plastic material, the pattern is dried to obtain water, light and scratch resistance.

Traditional inks are classified into solvent and water: solvent inks have excellent output and are widely used. They can be directly printed on special materials (such as polyvinyl chloride), but if printed on PET, PP, PC, PS, etc. A low-toxic material still needs to have an ink-absorbing layer. Although it has been previously developed, it can be directly printed on the above-mentioned low-toxic and uncoated plastic materials or glass, metal, ceramics and the like, and the solvent-type uncoated which has excellent output effect is obtained. Layer inkjet ink; however, in the era of environmental protection, although solvent inks have progressed from the traditional solvent-based inks of the first odorous toluene or ketone organic solvents to the use of weak solvent ECO inks, However, we still hope that there will be equivalent performance of "uncoated aqueous ink", which can replace solvent ink.

Generally, the water-based ink is required to have an output quality, and must be printed on a dielectric material having an ink-absorbing coating on the surface, thereby causing an excessive cost and being unpopular; and generally, the aqueous ink-jet ink uses a dye as a coloring agent, resulting in poor light resistance; Therefore, the novel aqueous inkjet ink of the present invention needs to use a light-resistant pigment to replace the dye, and the application is extended from the indoor to the outdoor; the resin material is used to fix the pigment and then spray the boundary surface, in order to achieve water resistance, water must be used. Emulsion resin. When selecting an emulsifying resin, it is also considered that the inkjet ink composition must have good versatility, not only For use in inkjet special paper, it is also possible to have excellent printing quality on ordinary paper, and at the same time, recording materials such as synthetic paper and plastic film which are low-absorbent or non-absorbent for ink can be output to high quality. Printed matter.

The main object of the present invention is to provide an aqueous ink composition comprising at least: a water-dispersible pigment paste, a hydroxyl group-containing organic solvent, an aqueous emulsion resin liquid, an aqueous emulsion wax, a surfactant, and water.

The water-dispersible pigment paste of the invention comprises a self-dispersing aqueous pigment paste and a disperse-type aqueous pigment paste which is added with a dispersant, and is generally commercially available as a color paste, and the commonly used colors are black, cyan, magenta and In the aqueous pigment paste such as yellow, the pigment solid content is preferably 0.5% to 15% of the total ink composition, and particularly preferably 1% to 6%.

The aqueous inkjet ink composition uses water as a main solvent and is supplemented by a hydroxyl group-containing organic solvent, such as glycols, polyols, glycol monoethers, etc. These hydroxyl solvents have the following characteristics: 1. Normal pressure The boiling point must be ≧180 degrees; Second, it can completely dissolve with water.

The "diol" of the hydroxyl group-containing organic solvent specifically refers to a monoalkyl ortho-diol derivative having the formula: CH ₂ (OH)-CH(OH)-(CH ₂ )mH, wherein 1 ≦m≦6, ie 1,2-propanediol, 1,2-butanediol, 1,2-pentanediol, 1,2-hexanediol, 1,2-heptanediol, 1,2-octanediol, can be used alone Mixed use; such a monoalkyl o-diol group is preferably used in an amount of from 12% to 18% by weight based on the total composition of the ink, and particularly preferably from 14% to 16% by weight. a formula of a "polyol" containing a hydroxyl group-containing organic solvent: CH ₂ (OH)-[CH(OH)]n-CH ₂ (OH), wherein 1≦n≦4, ie, glycerol, butanol, Pentaerythritol and hexahexol; the polyol is preferably used in an amount of from 3% to 6% by weight based on the total composition of the ink. The "diol monoether" of the hydroxyl-containing organic solvent specifically refers to an alcohol ether which is completely miscible with water, and has the formula: HO-(CHR-CH ₂ O)x-(CH ₂ )yCH ₃ , wherein R=H or CH ₃ , x, y = 1, 2, 3; when R = H: ethylene glycol n-propyl ether, ethylene glycol n-butyl ether, diethylene glycol methyl ether, diethylene glycol diethyl ether, diethylene glycol dibutyl Ether, triethylene glycol methyl ether, triethylene glycol diethyl ether, triethylene glycol butyl ether; when R = CH ₃ is: propylene glycol methyl ether, propylene glycol n-propyl ether, dipropylene glycol methyl ether, tripropylene glycol methyl ether; The diol-like monoethers may be used singly or in combination; such a diol monoether group is preferably used in an amount of 4% to 12% by weight based on the total composition of the ink.

The aqueous emulsion resin liquid of the present invention is specifically a resin dispersion emulsion which is insoluble in water by a resin. The present invention uses an aqueous acrylic resin emulsion or an aqueous polyurethane resin liquid, and can be used individually or in combination, and the amount used is an emulsion resin liquid. The amount of the resin solid is preferably 0.5 to 1.5 times the amount of the pigment solids. The aqueous emulsified wax liquid is specifically a non-ionic polyethylene wax (PE wax) emulsion, and the solid amount of the wax is 0.2 to 1.0 ratio of the solid amount of the resin liquid resin. The auxiliary agent for reducing the surface tension and defoaming of the inkjet ink composition in the present invention is specifically: a polyether modified oxoxane and an acetylene glycol derivative and the like are preferable, and the polyether of the gram chemical is modified. A surfactant such as a sulfonyl alcohol BYK 333 and an air product acetylene diol Surfynol 104E is particularly preferred, and the amount is 0.2% and 1.0% of the total amount of the inkjet ink, but is not limited thereto, and any surfactant can be used for adjustment. The surface tension of this inkjet ink is 20 to 35 dyne/cm.

The advantage of this aqueous inkjet ink composition compared to other conventional aqueous inks is that it can be printed on low-cost uncoated paper or other materials without special treatment, and combined with the output of the inkjet device to heat the rear section. The printed image has the advantages of high resolution, high gloss, high light fastness, scratch resistance, water resistance, etc., the ink has good stability and ink jet stability, and more importantly, the aqueous inkjet ink composition of the present invention is water-based. The solvent, combined with high-boiling alcohol solvent, has almost no VOC, no irritating taste, high safety to human body and environment, and is a new generation inkjet ink that can simultaneously maintain the health and environmental safety of operators and maintain print quality.

The main components of the aqueous inkjet ink composition of the present invention comprise: a water-dispersible pigment paste, a hydroxyl-containing organic solvent, an aqueous emulsion resin liquid, an aqueous emulsion wax, a surfactant, and water.

In the aqueous ink composition of the present invention, the pigment solid content of the water-dispersible pigment paste accounts for 0.5 to 15% of the total weight of the ink-jet ink composition, preferably 1 to 6%; the hydroxyl-containing organic solvent accounts for at least the spray. 20% by weight of the total weight of the ink composition, preferably 25% by weight or more; the solid weight ratio of the solid emulsion resin solids to the solids of the pigment is 0.1 to 2.5 times, preferably 0.5 to 1.5 times; The waxy particulate solids of the emulsifying wax is about 0.1 to 2.5 times, preferably 0.2 to 1.0 times the weight ratio of the resin; the surfactant is 0.05 to 2.0% by weight based on the total weight of the inkjet ink composition. The ink jet ink composition described above has a viscosity in the range of 2 to 20 cps at 25 ° C, preferably adjusted to 3 to 12 cps; the surface tension is between 18 and 40 dyne/cm, and is adjusted to 20 to 35 dyne. The best between /cm. The rest is water.

The water-dispersible pigment paste of the aqueous ink composition of the present invention has better light and weather resistance. Typical pigments are: Pigment Blue 15:3 and 15:4 (cyan); Pigment Red 122 and 202 (magenta) ; Pigment Yellow 14, 74, Yellow 114, 128 and 155 (yellow) and carbon black. The color pastes are divided into two categories: 1. Self-dispersing water-based pigment pastes, such as those sold by Cabot and Dike; 2. Dispersant-dispersed water-based pigment pastes, such as Fuji Pigment, Oriental Chemistry Products sold by industry.

The aqueous inkjet ink composition is mainly composed of water, and a high-boiling hydroxyl group-containing organic solvent is added as an auxiliary agent to ensure fluency of printing and prevent nozzle clogging, such as: glycols, polyols, glycol monoethers Among them, a combination of a glycol and a glycol monoether is preferred, and a combination of a glycol, a polyol, and a glycol monoether is more preferred. Diols such as: ethylene glycol, 1,2-propanediol, 1,3-propanediol, 1,2-butanediol, 1,3-butanediol, 1,2-pentanediol, 1,5- Pentylene glycol, 1,2-hexanediol, 1,6-hexanediol, diethylene glycol, triethylene glycol, dipropylene glycol, tripropylene glycol, etc.; Alcohols such as: glycerol, butyl alcohol, pentaerythritol, hexitol, etc.; glycol monoethers must be completely incompatible with water, such as: ethylene glycol n-propyl ether, ethylene glycol n-butyl ether , diethylene glycol methyl ether, diethylene glycol ether, diethylene glycol butyl ether, triethylene glycol methyl ether, triethylene glycol ether, triethylene glycol butyl ether, propylene glycol methyl ether, propylene glycol n-propyl ether, Dipropylene glycol methyl ether, tripropylene glycol methyl ether and the like. The selection of the aqueous emulsified resin liquid and the aqueous emulsified wax for the aqueous ink composition, the resin and the wax particles must be insoluble in water, and must have good adhesion with the printing medium to achieve water and scratch resistance. The invention adopts the aqueous acrylic emulsion resin liquid and the water-based polyurethane emulsion resin liquid as the resin source, and can be used singly or in combination; the non-ionic PE emulsified wax aqueous solution is selected as the wax source. In addition to adjusting the viscosity characteristics of the ink to meet the requirements of various types of nozzles and models, the resin emulsion must also have the adhesion to the general material, and play the role of fixing the inkjet pattern on the uncoated substrate. The wax emulsion plays the role of scratching the inkjet pattern after drying.

The design concept of the ink in the invention is as follows: after the ink is sprayed from the inkjet head to the substrate, the solvent such as water and hydroxyl is naturally volatilized and heated by the device in the back of the inkjet printer, and the resin mixed pigment is fixed on the substrate. In order to achieve the water resistance of the inkjet pattern, the resin used must be insoluble in water; however, in order to prevent the nozzle from drying out due to ink volatilization, the resin itself has a very good solubility to the hydroxyl solvent used. . In addition, the use of a higher boiling point hydroxyl solvent to increase the moisturization of the nozzle is also another way to avoid the resin being too easy to form a film, dry in the nozzle, and cause the nozzle to clog.

The surfactant may be an anthrone, a decane or an acetylene glycol, and may be used singly or in combination to reduce the surface tension of the inkjet ink composition. Since the ink of the present invention can be applied to various materials, the surface tension of the ink must be lower than that of the substrate, so that a good coating effect can be obtained, and the surface tension is preferably adjusted to be between 20 and 35 dyne/cm. Since the solvent used in the present invention all has a hydroxyl group, the use of a decane-based surfactant can form a hydrogen bonding force between molecules, and in addition to lowering the surface tension, the surface tension of each color can be controlled to be uniform, and halo is less likely to occur. In the case of ink, the best print quality can be obtained.

The advantages of water-based uncoated inkjet ink are: one water-based ink, green and environmental protection, and the earth; second, no volatile solvent, non-toxic, harmless, non-irritating odor; third, the printing medium does not need ink layer treatment, extensive Application; Fourth, easy to adjust the viscosity, suitable for a variety of nozzles; five, high resolution and high pattern saturation and other advantages. The water-based uncoated inkjet ink is applied to a large-scale industrial inkjet printer with a rear-end heating design for wide-format printing to achieve commercial mass production output; since it is not limited to paper application, and uses very low VOC alcohol Solvents can be widely used in food and clothing packaging, such as food and clothing, fully in line with today's environmental protection theme, and also to ensure the safety of operators and the surrounding environment, water-based coating-free inkjet ink composition will be the trend of inkjet ink in the future.

The aqueous inkjet ink composition uses a water-dispersible pigment paste to impart excellent light resistance to the inkjet pattern, and the paste can be a self-dispersing aqueous pigment paste and a dispersant-dispersed aqueous pigment paste. The aqueous emulsion ink composition uses an aqueous emulsion resin liquid, which is fixed on the printing boundary surface by drying the resin, and the selected resin is insoluble in water, so that the dried inkjet pattern can have a water resistance effect; In addition, the addition of the aqueous emulsifying wax to the aqueous inkjet ink composition can achieve the anti-scratch effect of the printed and dried pattern.

In addition, a surfactant such as polyoxyalkylene oxide and acetylene glycol is added to the aqueous inkjet ink composition, and the surface tension of the inkjet ink composition can be controlled to be printed on a medium generally having no ink absorption layer. Also provides this ink defoaming effect.

For a further understanding of the present invention, please refer to the examples set forth below. The following examples are merely preferred examples of the present invention and are not intended to limit the scope of the invention.

Waterborne inkjet ink preparation: Example:

[Ink 1]:

Diethylene glycol (16 parts) and diethylene glycol monomethyl ether (8 parts) were added to water (33.8 parts), stirred at room temperature for 30 minutes, and sequentially added aqueous acrylic resin solution (6 parts, An Feng AC 2403) and aqueous emulsified wax solution (5 parts, BASF Poligen WE 1), using a high shear emulsifier at room temperature, the rotation speed was set at 600 rpm, stirring for 30 minutes, and then adding a black dispersion (30 parts, Cabot Cab-O-Jet 300) and surfactant group (0.2 parts, BYK-333 and 1 part of BYK Chemical, Surfynol 104E), after continuous stirring for 1 hour, with a filter with a pore size of 0.8 μm Filtered to obtain Ink 1.

[Ink 2~7]:

The method of implementation is the same as that of the ink 1, but the 1,2-propanediol, 1,3-propanediol, 1,2-pentanediol, 1,5-pentanediol, 1,2-hexanediol, 1 listed in Table 1. 2-Ethylene glycol replaces diethylene glycol to obtain inks 2-7.

[Ink 8~9]:

The method was carried out in the same manner as the ink 6, but was added in the amount of 1,2-hexanediol listed in Table 1, and the amount of diethylene glycol monomethyl ether was changed at the same time (Table 1) to obtain inks 8 to 9.

[Ink 10~11]:

The method was carried out in the same manner as the ink 6, but the amount of 1,2-hexanediol was lowered, and 1,2-propanediol or 1,2-pentanediol (Table 1) was separately added to obtain inks 10 to 11.

[Ink 12~13]:

The method was the same as that of the ink 10, but the aqueous polyurethane resin solution (Deju EFPUMER 3206) was added to replace all or part of the aqueous acrylic resin liquid (Anfeng AC 2403). Referring to Table 1, the inks 12 to 13 were obtained.

[Ink 14~16]:

The method was the same as that of the ink 13, but the diethylene glycol monomethyl ether was replaced with triethylene glycol monomethyl ether, dipropylene glycol monomethyl ether and tripropylene glycol monomethyl ether listed in Table 1, respectively, to obtain inks 14 to 16.

[Ink 17]:

The method of implementation was the same as that of the ink 13, but the amount of diethylene glycol monomethyl ether was changed to 4 parts, and dipropylene glycol monomethyl ether (4 parts) was added. Referring to Table 2, the ink 17 was obtained.

[Ink 18~21]:

The method was carried out in the same manner as the ink 17, but the water-dispersed wax emulsion (BASF Poligen WE 1) was changed to 0, 2, 8 and 4 parts, respectively, to obtain inks 18 to 21.

[Ink 22~23]:

The method of implementation is the same as that of the ink 21, but the amount of the surfactant added is changed, as shown in Table 2, and the inks 22 to 23 are obtained.

[Ink 24~25]:

The method was the same as that of the ink 21, but the 1,2-propanediol was reduced to 3 parts, and 3 parts of glycerin or 3 parts of hexitol was separately added. Referring to Table 2, inks 24 to 25 were obtained.

[Ink 26~28]:

The method is the same as that of the ink 24, but with Cabot's cyan pigment dispersion (Cab-O-Jet 250C), magenta pigment dispersion (Cab-O-Jet 260M) and yellow pigment dispersion (Cab-O- Jet 270Y) replaces the black pigment dispersion (Cab-O-Jet 300), referring to Table 2, to obtain inks 26-28.

Ink test items and evaluations:

1. Viscosity test of inkjet ink composition, using a Brookfield DV-E model rotary viscometer, constant temperature control at 25 °C.

2. Surface tension test of inkjet ink composition, using a surface tension meter manufactured by Concord Interface Science Co., Ltd. CBVP-A3.

3. Particle size test of inkjet ink composition, using a Malvern Zetasizer nano-S particle size analyzer to detect average ink particle size, D50 and D90.

4. Inkjet inkjet inkjet test, using Dbe DR-640R inkjet printer, Seiko SEIKO DX7 nozzle, nozzle test, after printing 10 meters, check the nozzle, the nozzle is placed in the ink tank for 3 days, start cleaning function After that, the nozzle test is printed again, and the nozzle needs to be completely inked, without a plug or oblique spray phenomenon.

Evaluation A: Stop for more than 3 days, start 1 to 2 times for normal cleaning.

Evaluation B: Stop for more than 3 days and start strong cleaning once.

Evaluation C: Stop for more than 3 days, start 1 strong cleaning above.

5. Inkjet inkjet inkjet test, using Dbe DR-640R inkjet printer, Seiko SEIKO DX7 nozzle, nozzle test, continuous printing to observe the presence or absence of broken holes, oblique spray, flying ink.

Evaluation A: During the 12-hour continuous test, the occurrence of broken holes, oblique spray, and flying ink occurred less than 5 times.

Evaluation B: During the 12-hour continuous test, the occurrence of broken holes, oblique spray, and flying ink occurred 5 to 10 times.

Evaluation C: During the 12-hour continuous test, the occurrence of broken holes, oblique spray, and flying ink occurred more than 10 times.

6. Inkjet image performance test of inkjet ink composition: Using Dbe DR-640R inkjet printer, Seiko SEIKO DX7 nozzle for pattern printing, observe the dry image halo situation and color block uniformity performance.

Evaluation A: No halo phenomenon, the pattern color block is uniform and clear.

Evaluation B: A slight faint phenomenon in the heavy ink area, and the pattern color block performance is acceptable.

Evaluation C: The smudge was severe and the pattern color was poor.

7. Inkjet image performance test of inkjet ink composition. After observing the room temperature for 24 hours, the dry friction test performance of the color block was performed using TESTER SANGYO's color fastness friction tester, model AB-301.

Evaluation A: 500 g, rubbing back and forth 300 times, the color block pattern showed no attenuation, the cotton cloth was completely clean, or slightly colored.

Evaluation B: 500 g, rubbing back and forth 300 times, the color block pattern appeared slightly white, and the cotton cloth was slightly colored.

Evaluation C: 500 grams, rubbing back and forth 300 times, the color block pattern appears white, and the cotton color is serious.

8. Inkjet image performance test of inkjet ink composition. After observing room temperature for 24 hours, the wet rubbing test performance of the color patch was performed using TESTER SANGYO's color fastness friction tester, model AB-301.

Evaluation A: 500 g, rubbing back and forth 100 times, the color block pattern showed no attenuation, the cotton cloth was completely clean, or slightly colored.

Evaluation B: 500 g, rubbing back and forth 100 times, the color block pattern appeared slightly white, and the cotton cloth was slightly colored.

Evaluation C: 500 grams, rubbing back and forth 100 times, the color block pattern appeared white, and the cotton cloth was severely colored.

9. High-temperature stability test of inkjet ink composition: The ink was poured into a jar, placed in a constant temperature environment of 45 ° C for 8 weeks, and then returned to room temperature for viscosity and particle size analysis.

Evaluation A: The change in ink viscosity and particle size measurement was less than 5%.

Evaluation B: The change in ink viscosity and particle size measurement is less than 10%.

Evaluation C: The change in ink viscosity and particle size measurement was greater than 10%.

10. Low-temperature stability test of inkjet ink composition: The ink was poured into a jar, placed in a constant temperature environment of -10 ° C for 8 weeks, and then returned to room temperature for viscosity and particle size analysis.

Evaluation A: The change in ink viscosity and particle size measurement was less than 5%.

Evaluation B: The change in ink viscosity and particle size measurement is less than 10%.

Evaluation C: The change in ink viscosity and particle size measurement was greater than 10%.

The evaluation of the aqueous inkjet ink evaluation test table 3 shows that the aqueous inkjet ink composition of the present invention can fully satisfy the evaluation item. In the ink 1~7 test, from the uniformity of the printing pattern and the dry and wet scratch resistance of the dried pattern, the inks 2, 4, 6 and 7 are obviously better, and the alkyl group-containing diol can be summarized. The solvent is more suitable for use in such aqueous ink compositions. Comparing the inks 6, 8 and 9, it was found that the increase or decrease of the amount of 1,2-hexanediol and diethylene glycol monomethyl ether showed that the uniformity of the micro-printing patterns was different from that of the continuous printing. Compare inks 6, 10 and 11, fix the amount of diethylene glycol monomethyl ether, reduce the amount of 1,2-hexanediol, make up with 1,2-propanediol or 1,2-pentanediol, and find that the three inks are hot and cold. The stability, print fluency, nozzle moisture retention and wet and dry abrasion resistance are not significantly different, but the drying speed of the ink 10 is faster than the other two inks. Ink 10, 12 and 13 respectively use acrylic emulsification tree The grease and the polyurethane emulsifying resin are used together, and the ink 12 is slightly fluent in printing, and the ink 13 is excellent in wet and dry abrasion resistance. Inks 13 to 16 of different glycol monoether solvents, or inks 17 mixed with glycol monoether solvent, all tests performed similarly. Ink 17~21 is added with different water-based emulsified wax. The ink 18 wet and dry abrasion test has the worst performance. The dry, wet abrasion test of inks 17, 20 and 21 is very good. The inks 21~23 are added with different surfactants, the ink 22 has poor fluency, and the ink 23 has poor defoaming ability. Ink 24~28 added polyol sugar to increase the moisturization of the nozzle, and a color formula is derived, wherein the ink patterns of inks 25 and 27 are slightly slower to dry.

The ratio of the component addition amount of the present invention varies depending on the ink color and the size of the nozzle of the model, and may be added alone or in combination. The ink jet ink composition of the present invention can be used in piezoelectric inkjet printers of different brands and can be quickly printed on uncoated substrates.

While the invention has been described by the preferred embodiments of the present invention, the invention is not to be construed as limited. Therefore, the present invention includes such modifications and variations, and is included in the scope of the appended claims and their equivalents.

Claims (19)

An aqueous inkjet ink composition comprising: a water-dispersible pigment paste, a hydroxyl-containing organic solvent, an aqueous emulsion resin liquid, an aqueous emulsion wax, a surfactant, and water; wherein the water-dispersible pigment paste The pigment solid content accounts for 0.5-15% of the aqueous inkjet ink composition; the hydroxyl group-containing organic solvent accounts for more than 20% of the aqueous inkjet ink composition, and is a water-miscible hydroxyl group having an atmospheric boiling point of °180 °C. The organic solvent; the ratio of the resin solid content of the aqueous emulsion resin liquid to the pigment solid content of the water-dispersible pigment paste is 0.1 to 2.5; the ratio of the wax solid content of the aqueous emulsion wax to the resin solid content of the aqueous emulsion resin liquid is 0.1 ~2.5; the surfactant accounts for 0.05 to 2.0% of the aqueous inkjet ink composition. The aqueous inkjet ink composition according to claim 1, wherein the water-dispersible pigment paste is a self-dispersing aqueous pigment, and is mainly composed of a black, cyan, magenta, yellow self-dispersing aqueous pigment and The water is composed separately. The aqueous inkjet ink composition according to claim 2, wherein the water-dispersible pigment paste has a pigment solid content of 1% to 6% of the aqueous inkjet ink composition. The aqueous inkjet ink composition according to claim 1, wherein the water-dispersible pigment paste is mainly composed of an aqueous pigment of black, cyan, magenta and yellow, respectively, with water, a dispersant, a surfactant or a solvent. Grinding and dispersion. The aqueous inkjet ink composition according to claim 1, wherein the hydroxyl group-containing organic solvent comprises a glycol and a glycol monoether. The aqueous inkjet ink composition according to claim 5, wherein the diol is a monoalkyl vicinal diol, wherein the monoalkyl diol is at least one selected such as CH ₂ (OH) The formula of -CH(OH)-(CH ₂ )mH, 1≦m≦6. The aqueous inkjet ink composition according to claim 6, wherein the monoalkyl diol The weight percentage of the content is from 12% to 18% of the aqueous inkjet ink composition. The aqueous inkjet ink composition of claim 6, wherein the monoalkyl ortho-diol content is from 14% to 16% by weight of the aqueous inkjet ink composition. The aqueous inkjet ink composition according to claim 5, wherein the glycol monoether is an alcohol ether which is completely miscible with water, and the alcohol ether which is completely miscible with the water is at least one selected such as HO-( CHR-CH ₂ O) The formula of x-(CH ₂ )yCH ₃ , R = H or CH ₃ , x, y = 1, 2, 3. The aqueous inkjet ink composition according to claim 5, wherein the glycol monoether is a water-miscible glycol monomethyl ether, and the water completely miscible glycol monomethyl ether is selected at least One has the formula shown as HO-(CHR-CH ₂ O)z-CH ₃ , R=H or CH ₃ , and z=2,3. The aqueous inkjet ink composition of claim 9, wherein the glycol monoether content is from 4% to 12% by weight of the aqueous inkjet ink composition. The aqueous inkjet ink composition of claim 10, wherein the glycerol monomethyl ether content is from 4% to 12% by weight of the aqueous inkjet ink composition. The aqueous inkjet ink composition according to claim 5, wherein the hydroxyl group-containing organic solvent further comprises a polyol. The aqueous inkjet ink composition according to claim 13, wherein the polyol is selected to have at least one as shown by CH ₂ (OH)-[CH(OH)]n-CH ₂ (OH) The formula, 1 ≦ n ≦ 4, and the weight percentage of the polyol is 3% to 6% of the aqueous inkjet ink composition. The aqueous inkjet ink composition according to claim 13, wherein the polyol is selected to have at least one as shown by CH ₂ (OH)-[CH(OH)]n-CH ₂ (OH) The formula, n=1 or 4, and the weight percentage of the polyol is 3% to 6% of the aqueous inkjet ink composition. The aqueous inkjet ink composition according to claim 1, wherein the aqueous emulsion resin liquid is an aqueous acrylic resin emulsion, an aqueous polyurethane resin liquid, or a combination thereof. The aqueous inkjet ink composition according to claim 1, wherein a ratio of a resin solid content of the aqueous emulsion resin liquid to a pigment solid content of the water-dispersible pigment paste is 0.5 to 1.5. The aqueous inkjet ink composition according to claim 1, wherein the aqueous emulsified wax is a nonionic polyvinyl wax emulsion, and the waxy solid amount of the aqueous emulsified wax and the aqueous emulsified resin liquid The resin solids ratio is 0.2 to 1.0. The aqueous inkjet ink composition of claim 1, wherein the surfactant is a polyether modified decane and an acetylene glycol, each accounting for 0.2% and 1.0% of the aqueous inkjet ink composition. .