JP2002363872A - Pretreatment solution for ink jet print dyeing, cloth for ink jet print dyeing and method of ink jet print dyeing - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a pretreatment solution for ink jet print dyeing having excellent temporal stability and workability, fabrics for ink jet print dyeing that is friendly to environment and causes no adverse effect on the conventional image quality, a method of ink jet print dyeing. SOLUTION: Naturally occurring, readily biodegradable paste and a thermally decomposable antifungal agent that decomposes at 50-200 deg.C are combined to prepare the objective pretreatment solution for ink jet print dyeing that has excellent storage stability and is friendly to environment, when it is scrapped after they are used (as an ink acceptor). Further, this invention relates to fabrics for ink jet print dyeing and method of ink jet print dyeing.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an ink-jet printing method for fabrics, and more particularly, to a pretreatment liquid for ink-jet printing, an ink-jet printing fabric which is environmentally friendly and excellent in workability, and an ink-jet printing method.

[0002]

2. Description of the Related Art In recent years, the ink jet printing system has made great strides and is establishing an important position in industry. In particular, ink-jet printing is capable of full-color dyeing while having a fabric-specific texture, and can easily record clear photographic images that were previously impossible.
It is attracting attention as a high value-added technology. In addition, inkjet printing can be processed efficiently with little waste, such as small lots and short delivery times, and is environmentally friendly because it does not use extra dye or water. The need for a next-generation printing method is increasing. However, usually, ink-receiving textiles are provided with an ink-receiving layer in order to suppress bleeding of ink, and at present, this ink-receiving layer is becoming a problem as a structure causing environmental pollution.

For example, Japanese Patent Application Laid-Open No. 05-179577 discloses the use of a water-absorbing resin as an ink receiving layer. However, the water-absorbing resins proposed therein are all synthetic polymers such as PVA. Although it has the advantage of being inexpensive, it is a hardly decomposable substance, and therefore has a problem of environmental pollution. Japanese Patent Application Laid-Open No. 06-146178 discloses the use of carboxymethylcellulose or sodium alginate as a sizing agent, but the former is a substance obtained by processing natural cellulose to make it water-soluble. Excellent but still suffers from environmental pollution. In addition, since the latter is a natural product, it tends to rot and is inferior in heat resistance, so that it is not possible to obtain stability over time due to a change in temperature. In addition, JP-A-07-252785 discloses oxidized starch, methylcellulose, and hydroxyethylcellulose in addition to the above, but these substances cause the same environmental pollution.

[0004]

SUMMARY OF THE INVENTION An object of the present invention is to solve the above-mentioned problems of the prior art, and to provide a pretreatment liquid for ink jet printing excellent in chronological stability and workability, and more environmentally friendly.
Another object of the present invention is to provide a conventional textile for inkjet printing and an inkjet printing method which do not impair image quality.

[0005]

Means for Solving the Problems As a result of the present inventors' intensive efforts to solve the above-mentioned problems, a pretreatment liquid was prepared by combining a natural paste having excellent biodegradability and a thermally decomposable antibacterial agent. It has been found that there is a pretreatment liquid for inkjet printing, an inkjet printing cloth, and an inkjet printing method that are excellent in storage stability and environmentally friendly when discarded after finishing the role of pretreatment (ink acceptance). The present invention has been completed.

The gist of the present invention is as follows: (1) A pretreatment liquid for ink-jet printing, comprising a natural paste and an antibacterial agent which decomposes at 50 to 200 ° C. (2) The pretreatment liquid for inkjet printing according to (1), wherein the BOD / COD value of the pretreatment liquid is in the range of 0.3 to 3. (3) characterized in that it also contains a semi-synthetic paste (1)
Or the pretreatment liquid for inkjet printing according to (2). (4) 5% to 40% by weight of semi-synthetic glue to natural glue
% Of the pretreatment liquid for ink-jet printing according to (3). (5) The pretreatment liquid for inkjet printing according to (3) or (4), wherein the semi-synthetic paste is a carboxymethylated water-soluble polysaccharide. (6) The pretreatment liquid for inkjet printing according to any one of (1) to (5), wherein the PVI value of the pretreatment liquid is 0.3 to 1.0. (7) A fabric for inkjet printing, comprising a fabric containing a natural paste and an antibacterial agent that decomposes at 50 to 200 ° C. (8) characterized in that it also contains a semi-synthetic paste (7)
Fabric for inkjet printing. (9) 5% to 40% by weight of semi-synthetic glue to natural glue
% Of the fabric for ink jet textile printing according to (8). (10) The textile for inkjet printing according to (8) or (9), wherein the semi-synthetic paste is a carboxymethylated water-soluble polysaccharide. (11) A step of applying a pretreatment liquid containing a natural paste and an antibacterial agent that decomposes at 50 to 200 ° C. to a fabric, a step of inkjet printing, a step of heat treating to decompose the antibacterial agent, and a pretreatment liquid. An ink jet printing method comprising a step of washing off the ink receiving layer.

[0007]

BEST MODE FOR CARRYING OUT THE INVENTION The present invention will be described in more detail. As the ink receiving agent applied to the pretreatment liquid for inkjet printing and the fabric for inkjet printing of the present invention, an environment-friendly natural paste is used. Specific examples of natural pastes include starch, seaweed, agar, sodium alginate, troloioi, tragacanth, gum arabic, dextran, konjac flour, glue, gelatin,
Casein, collagen, guar gum, locust bean gum, xanthan gum, carrageenan and the like.
In ink-jet printing, it is necessary to absorb flying ink droplets without bleeding. Especially when a recording material is a fabric, it is necessary to receive a large amount of ink droplets, and therefore, it has excellent water absorption as an ink receiving agent. Are preferred. Also,
In order to dye the inside of the fabric, it is necessary to allow the ink receiving agent to penetrate into the inside of the fabric as well. Sodium alginate and guar gum are examples of natural pastes that satisfy the above conditions. Particularly preferred is sodium alginate. The natural paste is preferably contained in the pretreatment liquid at 0.1 to 10% by weight. If it is less than 0.1% by weight, the effect of preventing bleeding is small, and if it is more than 10% by weight, the pretreatment layer tends to be uneven and it is difficult to uniformly apply it.

[0008] Natural pastes are environmentally friendly because they tend to rot, but have the disadvantage that they are difficult to store as processing solutions. Further, the antibacterial agent has an effect of preventing decay of the pretreatment liquid, but has a great disadvantage that once added, it kills bacteria and is difficult to dispose. In the present invention, the ink receptor is prevented from decay in the pretreatment liquid by the antibacterial agent, and when the ink receptor finishes the role of ink reception and separates from the fabric, the antibacterial agent is decomposed and easily rotted, and is discarded. There is a big feature that it is easy. Specifically, after applying the pretreatment liquid of the present invention containing a natural paste and a heat-decomposable antibacterial agent to a fabric, the fabric is passed through a drying process, or is subjected to inkjet printing, followed by heating such as coloring, drying, and setting. Since the antibacterial agent is decomposed by passing through the process, the waste liquid containing the washed ink receptor is easily decomposed and does not kill bacteria present in the activated sludge or the like.

At this time, the decomposition temperature of the antibacterial agent must be equal to or lower than the heat treatment temperature. Usually, the heat treatment temperature in the drying step and the color forming step in fabric processing is performed at 80 to 200 ° C., so that the decomposition temperature of the antibacterial agent needs to be 50 to 200 ° C. When the decomposition temperature of the antibacterial agent is 50 ° C. or lower, the decomposition proceeds even at room temperature, so that the antibacterial agent has poor chronological stability and cannot exhibit the antiseptic effect for a long time. That is, it is not preferable because excessive addition of an antibacterial agent is required. Heat treatment of the fabric at 200 ° C. or higher is not preferable because the fabric itself is decomposed. Therefore, an antibacterial agent having a decomposition temperature in the range of 50 to 200 ° C is selected.

Here, the decomposition temperature means that the antibacterial agent is (0.2
%) Is a temperature at which the residual ratio of the antibacterial agent on the cloth is 50% or less when the cloth to which the pretreatment liquid containing the pretreatment liquid is applied is heated at 50 to 200 ° C. for 3 minutes. 50-20 of the present invention
Examples of the thermally decomposable antibacterial agent that decomposes at 0 ° C. include 5-chloro-2-methyl-4-isothiazolin-3-one,
Methyl-4-isothiazolin-3-one, 1,2-benzisothiazolin-3-one, 2-methyl-4,5-trimethylene-4-isothiazolin-3-one, 2-octyl-4-isothiazolin-3-one And triazines such as hexahydro-1,3,5-tris-s-triazine. These compounds may be used alone or in combination of two or more.
Above all, an isothiazoline-based compound which does not affect dyeing and is highly stable over time, particularly 5-chloro-2-methyl-4-isothiazolin-3-one or 2-methyl-4-isothiazolin-3-one. Is preferred.

The heat-decomposable antibacterial agent of the present invention is preferably contained in the pretreatment solution in an amount of 0.005 to 1% by weight.
Particularly preferred is 0.5 to 0.2% by weight. 0.00
When it is less than 5% by weight, the preservative effect is not recognized,
If it exceeds 1.0% by weight, it will not completely decompose in the heating step,
It is not preferable because it remains. The pretreatment agent of the present invention is prepared by dissolving the above-mentioned natural paste, the heat-degradable antibacterial agent and optionally added components in water.

The pretreatment liquid of the present invention is preferably selected and combined with a combination of components and amounts used so that the BOD / COD value is 0.3 to 3.0. The ratio of BOD to COD generally indicates difficulty in microbiological degradability, and it is said that a higher value indicates better microbiological degradability and easier biological treatment. If it is less than 0.3, biological treatment cannot be expected, and if it is more than 3.0, the pretreatment liquid tends to rot,
It is necessary to add an excessive preservative, which causes adverse effects on work environment and cost. BOD / COD of pretreatment liquid
By adjusting the value to the above range, the environment is less likely to be polluted even when the ink receiving layer is washed out after inkjet recording. The measurement of BOD and COD in the present invention is performed according to the following standards. BOD: JIS K-0102, paragraph 6, COD: JIS K-0102, paragraph 14

In the present invention, it is preferable to add a semi-synthetic paste to the pretreatment liquid or the fabric for ink jet printing. It is inferior to natural paste in terms of environmental friendliness, but is better than synthetic paste, and by mixing with natural paste,
Decomposes without adverse effects. Furthermore, the viscosity variation due to the temperature, pH, etc. of the treatment liquid is reduced, and since it is thermally stable even after being applied to the fabric, a printed matter excellent in levelness without uneven dyeing is obtained. preferable. 5% to 40% by weight of semi-synthetic paste based on natural paste
It is preferable to add so that 40 semi-synthetic paste
% Or more is excellent in leveling property, but is not preferred because it causes a problem of environmental pollution. On the other hand, when the content is 5% or less, the above-mentioned effects are not observed. Specific examples of the semi-synthetic paste include methyl cellulose, ethyl cellulose, hydroxyethyl cellulose, hydroxymethyl cellulose, hydroxypropyl cellulose, hydroxypropyl methyl cellulose, carboxymethyl cellulose, carboxymethyl starch, carboxymethyl guar gum, carboxymethyl locust bean gum, carboxymethyl tamarind gum, Carboxymethyl tragacanth gum, carboxymethyl xanthan gum and the like can be mentioned.

Among them, carboxymethyl cellulose, carboxymethyl starch, carboxymethyl guar gum, carboxymethyl locust bean gum, carboxymethyl tamarind gum, carboxymethyl tragacanth gum, etc. Carboxymethylated water-soluble polysaccharides such as carboxymethyl xanthan gum are preferred. Further, the degree of etherification of the carboxymethylated water-soluble polysaccharide is 0.5 to 1.5,
Particularly, 0.65 to 0.9 is preferable. The degree of etherification is 1.
If it exceeds 5, it causes environmental pollution, and if it is 0.5 or less,
It is difficult to dissolve in water and causes a problem in workability such as a large variation in viscosity.

Further, the P of the processing liquid for forming the ink receiving layer
The VI value is preferably in the range of 0.3 to 1.0, which is excellent in fluidity, since the recording material is a cloth having a certain thickness. If it is less than 0.3, the fluidity is poor, so that so-called mescha is apt to occur. Here, the PVI value is 60 rpm using a B-type viscometer.
A (cps) when rotated at a speed of s and 6 rpm
quotient A of viscosity B (cps) when rotated at speed of s
/ B.

As a method of applying the pretreatment liquid,
Any method such as a pad method, a spray method, a dipping method, a coating method, a laminating method, a gravure method, an ink jet method, a screen method, a roller method, and a rotary method can be used. Furthermore, the pretreatment liquid of the present invention includes a volatilization inhibitor, a catalyst, an oil absorbing agent, an antifoaming agent, a retaining agent, a plasticizer, a fat,
Wax, viscosity modifier, thermosetting resin, crosslinker, infrared absorber, ultraviolet absorber, light resistance improver, antioxidant, extender, fluorescent brightener, adsorbent, reduction inhibitor, sequestering agent, It is possible to add a bulking agent, a moisture absorbent, a penetrant, an electrolyte, a fragrance, a deodorant, an insect repellent, and the like. In the inkjet printing method of the present invention, after applying the pretreatment liquid to the fabric,
The heat treatment may be performed at any time before the cleaning treatment.
The process is not particularly limited as long as the process can be performed at a temperature higher than the decomposition temperature of the antibacterial agent even after the pretreatment liquid is applied or after inkjet printing.

Further, the ink jet printing method includes:
A continuous method such as a charge modulation method, a micro dot method, a charge ejection control method, an ink mist method, and an on-demand method such as a piezo method, a bubble jet (registered trademark) method, and an electrostatic suction method can be adopted. As the fiber material for fabric used in the present invention, specifically, cotton,
Natural fibers such as silk, hemp and wool, regenerated fibers such as rayon and cupra, semi-synthetic fibers such as diacetate and triacetate, acrylic, polyester, nylon 6, nylon 6
6, synthetic fibers such as polylactic acid, polycaprolactone, polybutylene succinate, and polyurethane, and the like, which may be used alone or in combination. Also,
Colorants include direct dyes, disperse dyes, reactive dyes, acid dyes,
Examples thereof include basic dyes, cationic dyes, metal complex dyes, oil-soluble dyes, pigments, and the like, which can be appropriately selected and used according to the fiber material to be recorded.

[0018]

EXAMPLES Hereinafter, specific examples will be described.
The present invention is not limited to these examples.

[0019]Example 1  A pretreatment liquid 1 having the following formulation and method was prepared. [Pretreatment liquid 1] San-algin MVR (natural paste: sodium alginate, manufactured by Sansei Co., Ltd.) 2.4% Marporose M-25 0.6% (semi-synthetic paste: methylcellulose, manufactured by Matsumoto Yushi Seiyaku Co., Ltd.) Staining acid ( Malic acid 50% aqueous solution) 0.5% Reactant MS (reduction inhibitor, manufactured by Uni Kasei Co., Ltd.) 1% KATHON PFM 0.2% (pyrolytic antibacterial agent, manufactured by ROHM AND HAAS) (active ingredient: 5-chloro-) 2-methyl-4-isothiazolin-3-one 2-methyl-4-isothiazolin-3-one)Remaining water  Total 100% BOD value / COD value = 0.48 PVI value = 0.58

The above-mentioned San-Algin MVR, Marpolose M-25, staining acid and Reactant MS were mixed with water and stirred for 30 minutes, and the resulting solution was added to KATHON.
By adding PFM and stirring for another 10 minutes,
Pretreatment liquid 1 was obtained. Normal desizing scouring was performed on a 100% polyester nappied fabric. Next, the pretreatment liquid 1 was applied from the recording surface of the cloth by a rotary screen method. Next, based on the data input in advance, the pressure applied from the nozzles, the opening / closing of the nozzles, the position of the recording material, the travel of the cartridge, and the like were computer-controlled, and ink was applied by the ink jet method.

The prescription and conditions are shown below. [Ink formulation] C.I. I. Disperse Red 127 5% Anionic surfactant 4% Shin-Etsu Silicone KM-70 (antifoaming agent, manufactured by Shin-Etsu Chemical Co., Ltd.) 0.05% Ethylene glycol 3% Silicic acid 0.1%Deionized water remaining  100% in total [Inkjet conditions] Recording device: On-demand serial scanning recording device Nozzle diameter: 50 μm Driving voltage: 100 V Frequency: 5 kHz Resolution: 360 dpi Next, wet heat treatment was performed at 150 ° C. for 10 minutes.

Thereafter, the bath ratio was 1: 100 under the following conditions.
Immersed in the cleaning solution, treated at 80 ° C for 30 minutes, and dried
Then, a printed matter was obtained. [Washing conditions] Sodium hydroxide 1% Lipotol TC-300 (soaping agent, manufactured by Nichika Chemical Co., Ltd.) 0.2%Hot water remaining  100% in total

[0023]Evaluation method  For the pretreatment liquid and printed matter created as described above,
Then, the following evaluation was performed. The results are shown in Table 1.
You. 1) Daily stability of the pretreatment liquid Leave the pretreatment liquid in a constant temperature room at 25 ° C.
The viscosity was measured with a meter. Until the viscosity drops sharply
The number of days was evaluated as the number of stable days of the pretreatment liquid.Judgment criteria  Larger value is more stable

2) Thermal stability of ink-receiving layer The thermal stability of the ink-receiving layer is determined by the density of the printed matter depending on the heating temperature.
It was evaluated by variation. After drying at 170 ° C,
After drying at 150 ° C. with the printed print A,
K / S value (reflection
Rate). Density difference = (K / S value of B) − (K / S value of A)Judgment criteria  The larger the value, the greater the variation and the lower the heat resistance.

3) Decomposability of waste liquid Pretreatment liquid application, drying, ink jet printing, coloring,
After a series of washing processes, receiving the washed-out ink
Collect the waste liquid containing the layer and keep it in a thermostat at 28 ± 2 ° C.
Was. Septic liquid (peptone, sodium chloride, meat extract and
Bacteria (Bacillus subtilis, Esche
richia coli, Pseudomonas a
eruginosa) and the bacterial abundance is 10%.⁵Pieces
/ Ml) to the collected waste liquid.
%, And after culturing for 2 days, count the number of viable cells and convert to viable cells.
Was evaluated as follows.Judgment criteria  ○ = 10 viable bacteria⁴Individual / ml or more △ = 10 viable bacteria²10 pieces / ml or more⁴Less than pcs / ml × = 10 viable bacteria²Less than pieces / ml

[0026]Example 2  A pretreatment liquid 2 having the following formulation and method was prepared. [Pretreatment liquid 2] San-algine MVR (natural paste: sodium alginate, manufactured by Sansei Co., Ltd.) 7% Fine gum HE (semi-synthetic paste: CMC, manufactured by Daiichi Kogyo Seiyaku Co., Ltd.) 3% Staining acid (malic acid 50% aqueous solution) 0.5% Reactant MS (reduction inhibitor, manufactured by Uni Kasei Co., Ltd.) 1% Best side 200K (thermally degradable antibacterial agent; manufactured by Dainippon Ink and Chemicals) 0.05% (Active ingredient: 1,2-benzisothiazolin-3-one)Remaining water  Total 100% BOD value / COD value = 0.56 PVI value = 0.70 San-Algin MVR, Fine Gum HE, Dyeing
Mix acid and Reactant MS in water and stir for 30 minutes
After stirring, 200 K of Bestside was added to the resulting solution.
Then, by further stirring for 10 minutes, pretreatment liquid 2 was obtained.
Was. The evaluation was performed according to Example 1 except that the pretreatment liquid 2 was used.
Was.

[0027]Example 3  Polyester spandex instead of using napping fabric
Fabric was used. Other steps were the same as in Example 1.

[0028]Example 4  Applying pretreatment liquid instead of rotary screen method
Was carried out by a coating method. Other steps are as in Example 1.
According to.

[0029]Example 5  A pretreatment liquid 3 having the following formulation and method was prepared. [Pretreatment liquid 3] San-algin MVR (natural paste: sodium alginate, manufactured by Sansei Co., Ltd.) 4% malic acid (50% aqueous solution) 5% Reactant MS (Anti-reducing agent, manufactured by Uni Kasei Co., Ltd.) 1% KATHON PFM 0.2% (Pyrogenic antibacterial agent, manufactured by ROHM AND HAAS) (Active ingredient: 5-chloro-2-methyl-4-isothiazoline- 3-one 2-methyl-4-isothiazolin-3-one)Remaining water  Total 100% BOD value / COD value = 0.65 PVI value = 0.72 Same as Example 1 except that the pretreatment liquid 3 was used.

[0030]Comparative Example 1  A pretreatment liquid 4 having the following formulation and method was prepared. [Pretreatment liquid 4] San-algin MVR (natural paste: sodium alginate, manufactured by Sansei Co., Ltd.) 2.4% Marporose M-25 0.6% (semi-synthetic paste: methyl cellulose, manufactured by Matsumoto Yushi Seiyaku Co., Ltd.) Malic acid ( 50% aqueous solution) 0.5% Reactant MS (reduction inhibitor, manufactured by Uni Kasei) 1%Remaining water  Total 100% BOD value / COD value = 0.48 PVI value = 0.60 According to Example 1, except that the pretreatment liquid 4 was used.

[0031]Comparative Example 2  A pretreatment liquid 5 having the following formulation and method was prepared. [Pretreatment liquid 5] Polyvinyl alcohol (synthetic paste, manufactured by Kuraray) 5% Malic acid (50% aqueous solution) 0.5% Reactant MS (reduction inhibitor, manufactured by Uni Kasei) 1% KATHON PFM 0.2% (Thermolytic antibacterial agent, manufactured by ROHM AND HAAS) (Active ingredient: 5-chloro-2-methyl-4-isothiazolin-3-one 2-methyl-4-isothiazolin-3-one)Remaining water  Total 100% BOD value / COD value = 0.01 PVI value = 0.35 The procedure of Example 1 was followed except that the pretreatment liquid 5 was used.

[0032]Comparative Example 3  A pretreatment liquid 6 having the following formulation and method was prepared. [Pretreatment liquid 6] Fine gum HE (CMC; semi-synthetic paste, manufactured by Daiichi Kogyo Seiyaku Co., Ltd.) 3% Malic acid (50% aqueous solution) 0.5% Reactant MS (reduction inhibitor, manufactured by Uni Kasei Co., Ltd.) 1 % Preventol A-3 (antibacterial agent, manufactured by Bayer AG) 0.05% (active ingredient; N- (fluorodichloromethylthio) phthalimide)Remaining water  Total 100% BOD value / COD value = 0.03 PVI value = 0.70 According to Example 1, except that the pretreatment liquid 6 was used.

As is clear from Table 1, the pretreatment liquid for inkjet printing of the present invention has excellent storage stability, and the fabric for inkjet printing of the present invention has a great merit of being environmentally friendly. On the other hand, Comparative Examples 2 and 3, which do not use the formulation of the present invention, have excellent storage stability, but have problems of environmental pollution and are hardly decomposed, so that it takes time and cost to perform the waste liquid treatment of the ink receiver. Not valid.

[0034]

[Table 1]

[0035]

As described above, the pretreatment liquid for ink-jet printing according to the present invention has excellent storage stability and can reduce the burden on the operator. In addition, the ink-jet printing fabric and the ink-jet printing method according to the present invention have a great advantage that environmental pollution can be prevented and the earth is friendly because the ink receiver that has completed its role can be disposed of in a decomposable state.
In addition, the ink-jet printed matter produced by the present invention is clear and excellent in texture without impairing the conventional image quality.

──────────────────────────────────────────────────続 き Continued on the front page (51) Int.Cl. ⁷ Identification symbol FI Theme coat ゛ (Reference) D06M 15/13 D06M 15/13

Claims (11)

[Claims] 1. A pretreatment liquid for inkjet printing, comprising a natural paste and an antibacterial agent which decomposes at 50 to 200 ° C. 2. The pretreatment liquid has a BOD / COD value of 0.3 to 0.3.
3. The pretreatment liquid for ink-jet printing according to claim 1, which is in the range of 3. 3. The pretreatment liquid for ink-jet printing according to claim 1, further comprising a semi-synthetic paste. 4. The pretreatment liquid for ink-jet printing according to claim 3, wherein the weight percentage of the semi-synthetic paste to the natural paste is 5 to 40%. 5. The pretreatment liquid for ink-jet printing according to claim 3, wherein the semi-synthetic paste is a carboxymethylated water-soluble polysaccharide. 6. The pretreatment liquid for ink jet printing according to claim 1, wherein the PVI value of the pretreatment liquid is 0.3 to 1.0. 7. A fabric for ink jet printing, comprising a fabric containing a natural paste and an antibacterial agent that decomposes at 50 to 200 ° C. 8. The fabric for ink-jet printing according to claim 7, further comprising a semi-synthetic paste. 9. The fabric for ink jet printing according to claim 8, wherein the weight% of the semi-synthetic sizing agent relative to the natural sizing agent is 5 to 40%. 10. The fabric for inkjet printing according to claim 8, wherein the semi-synthetic paste is a carboxymethylated water-soluble polysaccharide. 11. A step of applying a pretreatment liquid containing a natural paste and an antibacterial agent that decomposes at 50 to 200 ° C. to a fabric, a step of inkjet printing, a step of decomposing the antibacterial agent by heat treatment, and a pretreatment liquid An ink jet printing method, comprising a step of washing off the ink receiving layer formed in step (a).