JPH0674390B2 - Ink for ink-jet printing and dyeing method - Google Patents

Description

TECHNICAL FIELD The present invention relates to an ink for ink-jet printing of a reactive dye and a dyeing method using the ink.

More specifically, it relates to an ink for inkjet printing of a reactive dye using a specific alkali generator and a dyeing method.

[Conventional technology]

Conventionally, a so-called ink jet recording method is known in which recording is performed by ejecting ink droplets from a minute ejection orifice.

In addition, an ink has been proposed which comprises an organic solvent capable of dissolving a disperse dye, water, and a water-soluble resin, dissolves the disperse dye in a solution having a surface tension of 40 dyne / cm or more, and prints a polyester cloth with ink jet ink (special feature: Kaisho 50-59108
Issue).

[Problems to be solved by the invention]

Ink-jet printing of cellulose fibers has not been sufficiently solved because no suitable printing ink has been obtained yet.

The present invention uses a reactive dye and a specific alkali generator,
It is an object of the present invention to provide a stable ink for ink-jet printing capable of printing a cellulose fiber with an ink-jet and a dyeing method in which an alkali treatment step is omitted.

[Means for solving problems]

That is, the present invention relates to an ink jet printing ink containing a reactive dye, an anti-drying agent, an alkali-generating agent and water as main components, as the alkali-generating agent represented by the general formula [I] CX ₃ COOM .... (In the formula, X represents a halogen atom, and M represents sodium, potassium, or ammonium.) An ink for ink-jet printing containing a trihalogenoacetic acid salt represented by The subject is a dyeing method characterized by dyeing cellulose-containing fibers.

Examples of the reactive dye used in the present invention include monochlorotriazine-based, dichlorotriazine-based, dichloroquinoxaline-based, vinylsulfone-based, monochlorodifluoropyrimidine-based, trichloropyrimidine-based, methylsulfonylchloromethylpyrimidine-based, and monoflor as a reactive group. Triazine type and general formula [II] (In the formula, A represents a group of an aromatic or aliphatic tertiary nitrogen compound bonded to a carbon atom of a triazine ring to form a quaternary ammonium salt, and Y can form an anion. A dye having a reactive group such as "representing a substituent". By ink-jet printing the three primary colors of these dyes, and in addition to the black color obtained from these three primary colors, it is possible to print a so-called natural full color.

The amount of the reactive dye used in the ink of the present invention is 1 to 30.
The range of wt% can be mentioned, and the range of 3 to 15 wt% can be mentioned preferably.

Specific examples of the anti-drying agent used in the present invention include the following.

Ethylene glycol, propylene glycol, glycerin, diethylene glycol, polyethylene glycol,
Propylene glycol, N-methyl-2-pyrrolidone,
It is a drying inhibitor such as caprolactone, ethylene glycol monomethyl ether, ethylene glycol diethyl ether, polyethylene glycol monomethyl ether, and 1,6-hexanediol.

The amount of the anti-drying agent used in the ink of the present invention is 2 to 60.
A range of 5% by weight can be mentioned, and preferably a range of 5 to 50% by weight can be mentioned.

The alkali generator of the present invention is represented by the general formula [I] CX ₃ COOM ………… [I], wherein X is a halogen atom such as chlorine, bromine, fluorine or iodine, and chlorine or bromine. Is preferred. Also M
Is sodium, potassium or ammonium, and particularly preferred is sodium. The amount of alkali generator used may be in the range of 1 to 30% by weight, and preferably in the range of 3 to 15% by weight.

In the present invention, the content of water is based on the total weight of the ink.
The range of 20 to 90% by weight can be mentioned, preferably 35
A range of up to 75% by weight can be mentioned.

Further, in the ink used in the present invention, various additives conventionally known in addition to the above main components, for example, a surface tension adjusting agent, a viscosity adjusting agent, an ultraviolet absorber, an antioxidant, a reduction inhibitor, A pH adjuster, a hydrophilic organic solvent and the like can be appropriately used in combination.

The ink of the present invention is obtained by mixing and dissolving the reactive dye from which the inorganic salt is removed in the reverse osmosis membrane with other components in water, and further, when printing, a fine nozzle having a diameter of 10 to 100 μ is used. Since it is passed, a better result can be obtained by performing a filtration process for removing coarse particles after the production.

Examples of the material to be dyed in the present invention include cellulose-based fiber-containing materials such as paper and cloth.

The dyeing method of the present invention is performed by printing with an ink jet using the ink of the present invention, and subjected to wet heat conditions, for example, high temperature and normal pressure steamer, high temperature and high pressure steamer, etc. A clear image can be obtained.

[Action and effect]

By using the ink of the reactive dye of the present invention, it becomes possible to directly print the cellulose-containing fiber by the wet heat fixing step.

In addition, when the cellulose / polyester mixed fiber is subjected to ink jet printing by using the reactive dye ink of the present invention and the disperse dye ink for ink jet printing together, the reactive dye ink of the present invention omits the alkali fixing step. This eliminates alkali decomposition of the disperse dye. Therefore, a wide range of disperse dyes can be selected, and a variety of practical colors can be produced. Also, the color tone,
There is an advantage that dyeing reproducibility such as density is greatly improved.

In particular, by using the specific reactive dye ink of the present invention, it was possible to obtain a dark color that is comparable to the conventional reactive dyes that require alkali fixation.

Further, the ink composition of the present invention has good long-term quality stability of ink (storage stability at low temperature, fluidity, long-term stability of reactive group, etc.), and nozzle clogging, nozzle tip peripheral portion It is excellent as an ink for ink-jet printing because it suppresses dry adhesion and bleeding of the printing cloth.

〔Example〕

Next, the present invention will be described more specifically by way of examples, but the present invention is not limited to the following examples.

The various evaluation methods in the examples are as follows.

(1) Viscosity The viscosity of the ink was measured under the following conditions using a BL type viscometer manufactured by Tokyo Keiki Co., Ltd.

Measuring temperature: 25 ℃ Rotor used: No.1 Rotor speed: 60 rpm (2) Stability The following tests were performed using ink.

(a) Heating stability and cooling stability The fluidity of the ink was observed after the ink was kept in a constant temperature bath for 1 hour under the following temperature conditions.

Heating temperature: 40 ° C. Cooling temperature: −15 ° C. Evaluation was performed as follows.

(b) Temporal Stability The ink was allowed to stand for 180 days at room temperature, and the presence or absence of sedimentation of dye crystals was observed and evaluated as follows.

(3) Ink-jet printing method (a) A printing ink that does not cause alkali fixation of cellulose fibers was printed on a cellulose broad cloth using a commercially available on-demand type ink-jet printing device, and dried at 100 ° C. for 30 seconds.

Next, apply this to the high temperature high pressure steaming fixing method (103 ° C × 10
Min.), And then boiled in a bath of 2 g / l of detergent for 10 minutes for washing to obtain a printing cloth.

(b) A printing ink for fixing alkali of cellulose fibers was printed on a cellulose broad cloth using a commercially available on-demand type ink jet printing device, and then 2% by weight of baking soda ink was overlaid on the previous printing. After 100
It was dried at ℃ for 30 seconds.

Next, apply this to the high temperature high pressure steaming fixing method (103 ° C × 10
Min.), And then boiled in a bath of 2 g / l of detergent for 10 minutes for washing to obtain a printing cloth.

In addition, the same procedure was performed for the inks treated in (a) and (b) of (2).

(4) Evaluation method of bleeding of printing cloth and darkness measurement method (a) Evaluation method of bleeding of printing cloth The contour of the image of the printing cloth obtained in (3) is observed under a microscope of 100 magnification, The degree of bleeding was evaluated as follows.

(b) Darkness measuring method The surface reflectance of the printing cloth obtained in (3) above was measured by a color difference meter (manufactured by Nippon Denshoku Industries Co., Ltd.). (3)-(a)
The printing cloth obtained in 1. was evaluated as a standard.

(5) Evaluation Method of Clogging of Nozzle and Dry Adhesion around Nozzle Tip The following evaluation was performed using ink.

(a) Evaluation Method of Nozzle Clogging The ink was fed into a nozzle having a diameter of 100 μm at a speed of 3.5 m / hr, and the state of ejection from the tip of the nozzle was observed.

After discharging for 1 hour, it was stopped for 1 hour, and discharging was performed again, and the discharging response time at this time was measured. The ejection stability was observed from the change in the ejection speed during the first hour and the change in the re-ejection rate after the stop for 1 hour.

The nozzle clogging was evaluated based on the above-described ejection response time and ejection stability.

(b) Evaluation method of dry adhesion to the periphery of the nozzle tip After 1 hour discharge and 1 hour re-discharge after 1 hour discharge according to the method (a) of the above (5), the periphery of the nozzle tip is a microscope of 100 magnification. It was observed below and the dry adhesion amount was evaluated as follows.

Examples 1 to 8 Reactive dyes [the following formulas (each of A to D)] 10 g CH ₃ OCH ₂ CH ₂ O ₈ H 10 g CCl ₃ COONa 10 g Acetic acid aqueous solution pH 5 adjusted water The mixture was stirred and mixed under below, and after dissolution, overtreatment was performed to prepare an ink.

According to the method described in (1) to (5) using the ink obtained above, various physical properties of the ink, bleeding and dark color of the printing cloth, and clogging of the nozzle and the vicinity of the nozzle tip The dry adhesion was investigated. The results were all good as shown in Table 1.

Claims (2)

[Claims] 1. An ink jet printing ink comprising a reactive dye, an anti-drying material, an alkali generating agent and water as main components, wherein the alkali generating agent has the general formula [I] CX ₃ COOM. In the formula, X represents a halogen atom, and M represents sodium, potassium or ammonium.) An ink for ink-jet printing, comprising a trihalogenoacetic acid salt represented by the formula: 2. A method for dyeing cellulose-containing fibers under moist heat conditions using an ink for ink jet printing, which comprises a reactive dye, an anti-drying agent, an alkali-generating agent and water as a main component. As an alkali generator, it contains a trihalogenoacetic acid salt represented by the general formula [I] CX ₃ COOM ......... [I] (wherein X represents a halogen atom and M represents sodium, potassium or ammonium). A dyeing method comprising: