JPS627315B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a discharge printing method with excellent whiteness or sharpness. More specifically, a ground color dye is applied to the fabric, and a reducing agent or a discharge printing composition containing a reducing agent and a cutting color dye is printed on the fabric, or a discharge printing method containing a reducing agent or a reducing agent and a cutting color dye is applied to the fabric. The composition is printed, a ground color dye is applied thereon, and after drying, the reducing agent is activated using low-temperature steam that activates the reducing agent even if the dye does not fully dye the fabric. This invention relates to a discharge printing method characterized by discharging a color dye, and then dyeing the dye in a high temperature range where dyeing of the ground color dye or the ground color dye and the interstitial color dye occurs.

Originally, there were two types of discharge printing methods: the ground dyeing method in which ground dyeing was performed in advance and the dye was completely dyed, and then the dye was discharged, and the ground dyeing method was performed in which the ground dyeing dye was discharged in an undyed/uncolored state and then There are methods such as Shirabuki, which dyes the dye, and Kikunuki, which dyes the ground dye and the insole color at the same time, but there is a method that does not require the ground dyeing process in advance and is processed continuously. The latter method has become rapidly popular in recent years. In particular, H.T.
-The continuous discharge printing method using S (superheated steam) has better quality stability of discharge-printed products and better reproducibility between batches than the conventional batch method using saturated steam. ,
It is well known that the whiteness is generally superior to that of dyeing and discharging once dyed.

However, if you compare the degree of discharge printing, that is, the white fabric before dye application and the white area after dye application and reduction, it is still yellow and colored. For example, dechlorin soluble, which has the best reducing power, It is difficult to obtain whiteness without yellowing even if polyester fibers are discharge-printed using Conch (manufactured by BASF).

This is clear from the fact that when we look at the white areas of commercially available polyester discharge-printed products, none of them are discharge-printed white.

The inability to obtain a white outline also means that the color will be dull due to the influence of the ground color, making it impossible to obtain a clear accent color. In particular, for loading and unloading, a tin chloride-based discharge printing agent is used, which has a lower reducing property than the discharge printing agent used for blanking, due to the problem of the reduction resistance of the ink color dye, so the discharge printing performance is even worse. In addition, when printing a synthetic fiber white discharge printing agent such as zinc sulfoxylate formaldehyde and a tin-based discharge printing agent for color removal adjacent to one design, the contact area between the two discharge printing agents becomes significant. In order to achieve a brown and colored color, it is common practice to perform white removal and color removal using only tin-based discharge dyes. In this case, it is well known that the tin-based discharge printing agent generates hydrogen chloride gas during the high-temperature discharge printing process, which causes the discharge printing area to be colored yellow.

If we examine the reasons why it is not possible to reproduce the same whiteness as the white fabric before dyeing, we find that it is due to the coloring caused by chlorine gas generated during high-temperature treatment, as seen with tin-based discharge dyes, and the coloring of the fabric during high-temperature heat treatment. Dye decomposition products caused by coloration due to sublimation of color and insert color dyes, a decrease in discharge printing efficiency as dyeing progresses, and the inability to remove colors of dyes that are almost completely dyed, as seen in background dyeing discharge printing. Possible causes include coloring of the residue.

The present inventors paid attention to these phenomena, and as a result of intensive research to improve them, we found that gas coloring, sublimation coloring, coloring by dye decomposition hue, and dyeing of dyes are possible in the discharge printing method in the state where the background dye is not dyed. Invented a low-temperature discharge printing method that does not cause progress.

In other words, the object of the present invention is to provide a method for discharging an undyed background dye without causing yellowing and significantly improving the white spotting properties of all reducing discharge printing agents, and furthermore, to provide an excellent method for discharging the undyed background dye without causing dullness of color. It provides a method for putting on and taking off clothes.

In order to achieve the above object, the present invention has the following configuration. That is, the fabric on which the background dye and the reducing discharge dye are in an undeveloped or inactive state is treated with steam at a low temperature range, that is, a temperature at which the dye is not sufficiently dyed, for example, 90 to 150°C, preferably 105 to 150°C.
70% activation treatment with superheated steam at 130℃ or saturated steam at 90-120℃ for 0.5-60 minutes.
Preferably, this is a discharge printing method characterized by obtaining a discharge printing effect of 80% or more and then processing at a high enough temperature to sufficiently develop/adhere the dye.

Further, the method of the present invention will be specifically explained in detail.

The removable dye used for the ground color may be applied by any method such as a padding method, a gravure printing method, a rotary screen, a roller print, or a flat screen print. In addition, the discharge printing composition containing or not containing the ink color dye may be applied by applying a ground color and then printing, or by printing the discharge printing composition and then overcoating the ground color. . The dye used for dyeing the ground color can be appropriately selected from various dyes depending on the purpose as long as it achieves the purpose of the present invention.

The same applies to the embossed dyes used for embroidery, but embossed dyes here have a broad meaning that includes not only so-called dyes but also various pigments used in tsuki-nuki. Therefore, dyeing with a light color dye includes not only dyeing with a so-called dye but also fixing the above-mentioned pigment with its fixing agent.

After applying/printing the ground color and the discharge printing composition, it is dried according to a conventional drying method. As in the conventional method, the drying temperature in this case is preferably 130°C or lower.

At the time of drying in this manner, the discharge printing composition mainly consisting of the ground dye and the reducing agent or the insulating dye and the reducing agent remains on the fabric and is in an undyed and unactivated state. Here, a low-temperature region is used as a means to prevent yellowing of white areas caused by dyeing and dyeing of some dyes sublimed by heat, prevent rapid gas generation, and activate only the reducing agent. After steaming and obtaining a sufficient white area, the dye is applied.

In our research, the temperature conditions required to activate the reducing agent in the discharge printing agent composition vary somewhat depending on the type, but in particular, in the case of saturated steam, 90 to 120°C is 120°C or higher. than the high temperature side of
In the case of HT-S, it has been found that white-out property is the best at 90 to 150°C compared to high temperatures of 150°C or higher, and yellowing factors as mentioned above are the least.

This is a completely new method compared to the conventional high-temperature discharge printing method that simultaneously activates the reducing agent and dyes the dye.

As reducing agents in the discharge printing agent composition, soluble forms of zinc sulfoxylate formaldehyde, such as Decrolin Soluble Conc (BASF), and insoluble forms thereof, such as Superlite SZ (Mitsubishi Gosho Co., Ltd.) and dichloride, are used. Similar effects are observed with any reducing agent such as a tin-based reducing discharge printing agent typified by tin, and the low-temperature discharge printing method of the present invention is effective in both cases.

In particular, with Super Light SZ, it was difficult to perform HT-S discharge printing on dark-colored products using fast dyes, but the method of the present invention can provide good white removal or color removal effects.

The temperature for activating this reducing agent is preferably saturated steam at around 100°C, but if it contains a large amount of moisture, there is a risk of halation or bleed, so it is desirable to perform sufficient dry steaming in advance.
After that, a treatment at 90 to 108°C for about 1 to 30 minutes gives good results.

For HT-S, for example, polyester fibers are preferably heated at 105-130°C for 3-30 minutes, and when using a high-pressure steamer, conditions are preferably 105-120°C for 5-50 minutes. Next, the high-temperature dyeing process varies depending on the type of fiber, but for example, for polyester fiber, it is 120-135℃ for 15-50 minutes using a high-pressure steamer, and for HT-S, it is 15-50 minutes.
Conditions of 5 to 30 minutes at 160 to 190°C are good. In the case of dry heat dyeing, a temperature of 180 to 220°C for 15 to 300 seconds is good.
In short, any temperature conditions are sufficient as long as the ground dye or the ground dye and the insert color dye are dyed.

In the conventional method, activation of the reducing agent and dyeing are carried out at the same time, but in the method of the present invention, the activation of the reducing agent has already been almost completed, so the main focus can be placed only on dyeing at this stage. .

Therefore, the high temperature treatment can be shorter than the conventional treatment time. Further, in conventional processing methods, it was difficult to apply a dry heat treatment without moisture due to the activation of the reducing agent, but the method of the present invention has the advantage of being able to fix dyes and develop color using a thermosol method.

After the dyeing process, reduction cleaning is carried out according to the usual method to finish.

Next, the method of the present invention will be specifically explained with reference to Examples. Of course, the present invention is not limited to these examples.

Example 1 A polyester dioset was padded under the following conditions, and the dye was applied uniformly on both sides, followed by drying in a cylinder dryer.

[Putting conditions]

Kiwaron Polyester Black RB 350g/ (Kiwa Kagakusha) Dianex Yellow G-FS 7g/ (Mitsubishi Kasei) Tercetyl Blue CRL 300% 21g/ (Montegison) Sodium alginate (10g/) 150g/ Concentrated dye 30g / Mangle 1dip 1nip 1.5Kg/cm ² After hand printing with a glue containing 30% Super Light SZ, 5% Teryl Carrier DPL (Meisei Chemical Co., Ltd.), and 2% Polyethylene Glycol 400.
It was dried with hot air at 100°C, activated with HT-S at 110°C for 15 minutes, and then dyed with a background color using HP-S (high-pressure steamer) at 130°C for 20 minutes.
The result was a product with an extremely high level of whiteness that was not seen in conventional products, and it was well received. By the way, when the same sample was finished using the conventional method (HT-S 180℃ x 8 minutes), it could not be said to be white, but was noticeably brown and colored.

Example 2 Kiwaron Polyester Black RB25% and lactic acid
0.3%, Maypro Gum NP (Maypro) 50% polyester decine pre-sealed with a printing paste containing 30% dechlorin and super light.
Each of the 30% SZ was printed and dried at 120℃, then treated with a normal pressure steamer at 102℃ for 20 minutes, and then
HP-S was treated at 130°C for 20 minutes. A very good white spot was obtained using a normal pressure steamer. Compared to Dechlorin, the one using Super Light SZ had better whiteness.

Example 3 Discharge printing was performed using a 30% tin-based discharge dye according to Example 2, and activation treatment was performed using HP-S at 105°C for 15 minutes and HT.
―S115℃×20 minutes, then both
HT-S was subjected to color development treatment at 180°C for 8 minutes.

The finished products had better whiteness compared to conventional HT-S processed only at 180°C for 8 minutes and HP-S processed only at 130°C for 30 minutes.

The conventional product was yellow and had a noticeable color.

In addition, the finished product obtained using the method of the present invention had very good clarity and was symmetrical with the dull hue of the conventional method.

Claims (1)

[Claims] 1 Applying a ground color dye to a fabric and printing a reducing agent or a discharge printing composition containing a reducing agent and a cutting color dye thereon, or applying a reducing agent or a discharge printing composition containing a reducing agent and a cutting color dye to a fabric. The material is printed, a ground color dye is applied on it, and then after drying, the dye does not stain the fabric, but the reducing agent is activated.The reducing agent is activated using low-temperature steam, and the ground color dye is activated. A discharge printing method characterized by discharging, and then dyeing the dye in a high temperature range where dyeing of the ground color dye or the ground color dye and the insulating dye occurs.