JPS62121776A - Ink for ink jet printing - Google Patents

Abstract

PURPOSE:To improve in terms of the viscosity of an ink, the clogging of a nozzle, and the adhesion of an ink around the tip of a nozzle due to drying, by incorporating a specified methanol/ethylene oxide adduct into an ink for ink jet printing. CONSTITUTION:A methanol/ethylene oxide adduct represented by the general formula CH3O(CH2CH2O)nH (wherein n is 2-12) is added to an ink containing water or an organic solvent compatible with water, a disperse dye, and a dispersing agent, the amount of the addition compound being 15-45wt% based on the total weight of the ink.

Description

[Detailed description of the invention] Industrial applications The present invention relates to an ink for inkjet textile printing.

More specifically, the present invention relates to an inkjet textile printing ink using a specific methanol ethylene oxide adduct.

2. Description of the Related Art Conventionally, so-called inkjet writing methods have been known in which writing is performed by ejecting ink droplets from minute ejection orifices.

In addition, an ink for inkjet printing of polyester cloth has been proposed in which a disperse dye is dissolved in a solution containing an organic solvent, water, and a water-soluble resin that can dissolve the disperse dye, and has a surface tension of more than u Odyn /cm. (Unexamined Japanese Patent Publication No. 1
0-! tf101 publication).

This publication states that a water-based ink in which a disperse dye is dispersed in an aqueous system using a surfactant is unsuitable because the surface tension of the ink is 30+b because a large amount of surfactant is used. 6 Also, an ink composition for use in an inkjet device, comprising at least one first liquid component that is generally immiscible with each other and polyethylene glycol having a degree of polymerization of /-1.
An ink composition is known which is characterized in that it comprises a co-liquid component of various types and further comprises a common solvent with which said immiscible liquid is generally miscible (JP-A-Sho!fll-
109! (Ruri No. 0 Publication).

The above ink composition was a complex ink composition requiring three liquids: an immiscible first liquid component, a second liquid component, and a solvent to mix them.

The present inventor has previously discovered that, by using a specific surfactant, synthetic fibers, etc. can be sufficiently jet-printed in both aqueous and organic solvent-based inkjet printing systems. Filed a patent application regarding ink (Japanese Patent Application No. 3J-Co II/3'1.3, Patent Application No. 397-3)
No. 5310).

Problems to be Solved by the Invention However, the above-mentioned ink for inkjet textile printing has the following problems:
Ink viscosity, nozzle clogging, and dry adhesion around the nozzle tip remained to be investigated.

The present invention aims to provide an inkjet textile printing ink containing a specific methanol ethylene oxide adduct, which has improved ink viscosity, nozzle clogging, and dry adhesion around the nozzle tip. That is the purpose.

Means for Solving the Problems The present invention provides an ink containing water or a water-compatible organic solvent, a disperse dye, and a dispersant containing the general formula (I) C! H,O(C!H,CH,0)nH・・・・・・・・・
...-φ・CI) (in the formula, n represents C to L) in proportion to l! to the total weight of the ink. ~4! ! The gist thereof is an inkjet textile printing ink characterized by containing % by weight.

As the methanol ethylene oxide adduct used in the present invention, n is in the range of 1 to /, preferably,
Examples include a range of 10 to 10. Further, the amount to be used is in the range of /j−41jwt−, and preferably in the range of 0−+0wt−.

Examples of the solvent include water, an organic solvent compatible with water, and a mixture of water and the organic solvent.

Examples of the organic solvents that are compatible with water include alcohols such as methyl alcohol, ethyl alcohol, and ethylene glycol, ketones such as acetone and methyl ethyl ketone, tetrahydrofuran, dioxane, dimethylformamide, dimethyl sulfoxide, and triethanolamine. Can be mentioned.

Examples of the disperse dyes used in the present invention include anthraquinone-based, azo-based, quinophthalone-based, methine-based, and heterofused ring-based disperse dyes that are insoluble or sparingly soluble in water.

Yellow dyes include greenish dyes such as pyridone, pyrazolone, quinophthalone, methine and azo dyes, while magenta dyes include blue dyes such as anthraquinone, azo, heteroazo and methine dyes. As cyan dyes, greenish dyes such as anthraquinone, naphthoquinone, and heteroazo dyes are preferably used.

By combining these three primary colors and the black obtained from these three primary colors, it is possible to print and dye the so-called full-color natural colors, such as madder.

The amount of the disperse dye used is in the range of 1 to 30% by weight, preferably in the range of 3 to 75% by weight.

Dispersants used in the present invention include nonionic surfactants such as polyoxyethylene alkyl phenol ether type and polyoxyethylene alkyl ether type, and anionic surfactants such as naphthalene sulfonic acid-formaldehyde condensate and lignin sulfonate. These can be used alone or in combination of two or more.

Further, the amount of the dispersant to be used is in the range of O, S to go% by weight, preferably in the range of 7 to 30% by weight.

Examples of antifoaming agents that can be used in the present invention include silicone antifoaming agents such as Shin-Etsu Silicone 850 (manufactured by Shin-Etsu Chemical Co., Ltd., trademark), FB Antiform 3≠Da (manufactured by Dow Corning Co., Ltd., trademark); Examples include pluronic antifoaming agents such as Adekanol LG-u/ (manufactured by Asahi Denka Co., Ltd., trademark) and alcoholic antifoaming agents such as Surf-Inol 104 (E (manufactured by Nissin Chemical Co., Ltd., trademark)).

Examples of hydrotropes include urea, dimethylurea, sodium toluenesulfonate, etc.The ink of the present invention may contain the above-mentioned antifoaming agents, hydrotropes, and silicic acid, and may also contain other additives in some cases. The ink of the present invention may contain the above-mentioned disperse dye, dispersant, and methanol ethylene oxide adduct, and if necessary, the above-mentioned antifoaming agent, hydrotrope, silicic acid, and other additives. Add the dye to the solvent and use a fine pulverizer such as a sand grinder or paint conditioner to remove the dye.
, o o s to 10 μ, preferably o, o o s to l
It can be obtained by grinding and dispersing into μ particles.

Further, since the ink of the present invention passes through a fine nozzle with a diameter of 10 to 100 μm, even better results can be obtained by performing a filtration step after production to remove coarse particles.

Function: The inkjet printing ink containing the specific methanol ethylene oxide adduct of the present invention has improved ink viscosity due to the weak hydrogen bonding properties of the methanol ethylene oxide adduct. Although clogging and dry adhesion around the nozzle tip are improved, the present invention is not limited to the following examples.

The methods for testing various physical properties of ink, the dyeing method for inkjet textile printing, and the measuring method for bleeding and dark color of printed fabrics in Examples and Comparative Examples are as follows.

(1) Ink concentration The inks o and sy prepared in each example were diluted with water to
00ml dye aqueous solution, take this dye aqueous solution /-,
It was diluted with go% acetone aqueous solution (017% acetic acid acidity) to give 100-. The absorbance at the maximum absorption wavelength, λmax, of this solution was measured, and the color density was determined by relative comparison (the comparative example was used as the standard (100)).

(2) Viscosity The viscosity of the ink was measured using a BL type viscometer manufactured by Tokyo Keiki Rizo Co., Ltd. under the following conditions.Measurement temperature: s°CF Running rotor: Ji/Rotor rotation speed: AOrpm (3) Grains Viscous paper I6h manufactured by Dotoyo F Paper Co., Ltd.

After filtering the ink using a filtration process, the particle size was measured using the following device.

Particle size measuring device: Submicron particle analyzer N-+ (
(Manufactured by Coulter Inc.) Measuring particle size range', 0.003 to 3μ (4) Dispersion rate After transferring the ink to a 100-meter graduated cylinder and allowing it to stand at room temperature for 7 days, 10m from the top and 10tyt from the bottom were measured.
pull out.

The absorbance at λmax of this extracted aqueous dye solution is measured according to the method (1) above.

Then, the water dispersion rate was calculated using the following formula.

(5) Stability (a) Heating Stability and Cooling Stability The fluidity and particle stability of the ink after it was maintained in a constant temperature bath for 1 hour under the following temperature conditions were observed and evaluated as described below.

Heating temperature: 60℃ Cooling temperature: -/j'c ○ Δ , was evaluated as follows.

○ Δ made,
After printing on polyester silk satin cloth using a commercially available on-demand inkjet printing device, ioo
It was dried at ℃ for 30 seconds. Next, this is done by high temperature normal pressure steam fixation method (l?tcxf minute)? After the treatment, reduction cleaning was performed to obtain a printed fabric.0 (b) Method for evaluating bleeding of printed fabric Observe the outline of the image of the printed fabric obtained by method (a) of (6) above under a microscope at 30x magnification. The degree of bleeding was evaluated as follows.

○ Δ × No bleeding 1111 Large bleeding (C) Ii Chromaticity measurement method The surface reflectance of the printed fabric obtained by the (,) method in (6) above was measured using a color difference meter (manufactured by Nippon Denshoku Co., Ltd.). The surface reflectance of Tokutomo dyed fabric was measured as 100 (standard) in a comparative example, and a relative value was calculated.

(7) Method for evaluating nozzle clogging and dry adhesion around the nozzle tip (a) Method for evaluating nozzle clogging Ink is fed into a nozzle with a diameter of 100μ at a speed of 3.3 d/hr, and the ink is injected from the nozzle tip. The discharge speed was measured.

After discharging for 1 hour, it was stopped for 1 hour, and discharge was performed again, and the discharge response time at this time was measured.

Nozzle clogging is caused by changes in discharge speed during the first 7 hours,
Evaluation was made based on the re-ejection response time after stopping for 1 hour.

Change in ejection speed OΔ ) According to the method, after discharging for 1 hour, stopping for 1 hour, and discharging again for 1 hour, the area around the nozzle tip was
Observed under a magnifying microscope and evaluated the amount of dry adhesion as follows: 0 Dry adhesion OΔ The ink was pulverized in a FA to produce ink.

The dyes and methanol ethylene oxide adducts used are shown in Table 7 below.

Composition Dye [Formula (A) or (B) below] (Usage amount shown in Table 1) Sulfonate (Note A for Reaxf) Silicone antifoaming agent [Shin-Etsu Silico 0.0
1 g-n KB! 0 notes 2] Urea
SII silicic acid [Anilozirco 000 Note 3]
0. / 1 Note 1: Manufactured by Westvaco,
Trademark note 2: Manufactured by Shin-Etsu Chemical Co., Ltd. Trademark note 3: Manufactured by Nippon Aerosil Co., Ltd. Trademark *Dye A: Quinophthalone disperse dye (powder) represented by the following structural formula.

Dye B: Anthrathinone-based disperse dye (powder) represented by the following structural formula.

U.K.

Table 1 Using the ink obtained above, each physical property of the ink, bleeding and dark color of the printed fabric, clogging of the nozzle and the vicinity of the nozzle tip were determined according to the methods (1) to (7) above. As a result of examining the dry adhesion to the inkjet textile ink of the present invention, all of the inkjet textile printing inks of the present invention shown in Table 1 were good.

Claims (1)

[Claims] An ink containing water or an organic solvent compatible with water, a disperse dye, and a dispersant having the general formula [I] CH_3O(CH_2CH_2O)_nH...
...Inkjet textile printing characterized by containing 15 to 45% by weight of a methanol ethylene oxide adduct represented by [I] (wherein n represents 2 to 12) based on the total weight of the ink ink.