JP4691319B2 - Dyeing method for composite fiber materials - Google Patents

Description

  The present invention relates to a method for dyeing a composite fiber material that dyes a composite fiber material containing polyester and synthetic polyamide in the same color and firmly. More specifically, a predetermined disperse dye, an acidic dye or an acidic metal-containing dye, a predetermined fixing agent or a combination of a fixing agent and a pH slide agent, and if necessary, a leveling agent for uniformly dyeing polyester fibers in one bath. The above-mentioned method for dyeing a composite fiber material characterized by adding and dyeing, and after dyeing with a disperse dye and an acid dye or an acid-containing metal dye, a post-treatment by acid reduction is performed. The present invention relates to a method for dyeing composite fiber materials.

  Commercialization of polyester fiber materials containing synthetic polyamides with good stretchability is being made for functional clothing. Conventionally, in this composite material dyeing process, the polyester side is dyed with a dye bath made of disperse dye at high temperature and pressure, then drained, and then the synthetic polyamide side is dyed with another dye bath made of acid dye or acid mordant dye. Then, a two-bath dyeing method was adopted. In this method, usually, after the dyeing and drainage on the polyester side, alkali reduction washing is performed to dye the polyester side firmly, and after the dyeing and drainage on the polyamide side, the acid dye or acid mordant dye is used. In order to prevent the resulting decrease in wet fastness on the polyamide side, a fix treatment with a fixing agent is performed.

  However, the above method requires a large number of steps, and the entire dyeing step becomes very long, which is extremely disadvantageous economically. Therefore, it has been desired to develop a method capable of dyeing the polyester side and the synthetic polyamide side with a single bath if the number of steps required is smaller.

  Furthermore, in the above dyeing method, the disperse dye is also dyed on the synthetic polyamide fiber, and the wet fastness may be significantly reduced due to the disperse dye. Disperse dyes dyed on synthetic polyamide fibers are difficult to remove even after the above alkaline reduction washing and fixing treatment. As a result, this dyeing field is considered to be a field with very poor wet fastness until recently. Therefore, drastic improvement has been desired.

  Reduction in wet fastness due to disperse dyes dyed on synthetic polyamide fibers can be prevented by selecting disperse dyes with little dyeing on synthetic polyamide fibers, or disperse dyes that are fast even after dyeing. In some cases. However, depending on this method, the range of disperse dyes that can be selected is very limited. Therefore, it has been desired to improve wet fastness by other methods such as removal of disperse dyes.

  The present invention is a method for dyeing a composite fiber material containing polyester and synthetic polyamide, giving a robust and high-quality dyed material, and further capable of dyeing the polyester side and the synthetic polyamide side and other processes in one bath. It is an object of the present invention to provide a dyeing method that is characterized by the above-mentioned and that is excellent in terms of economy with a small number of steps. The present invention further includes a post-treatment step for preventing a decrease in wet fastness due to dyeing of the disperse dye on the synthetic polyamide side, that is, a step of removing the disperse dye, and a wider range of disperse dyes It is an object of the present invention to provide a method for dyeing the composite fiber material that enables selection of the above.

  The present inventor has intensively studied the establishment of a method in which the fixing of the dye to the synthetic polyamide side proceeds during dyeing with the goal of reducing the number of steps. The inventor has also made extensive studies on a method for removing disperse dyes dyed on the synthetic polyamide side. As a result, a specific condensation-type fixing agent or a combination of a specific condensation-type fixing agent and a PH slide agent is used, and a dyebath containing the selected disperse dye and acid dye or acid-containing metal dye is used. By dyeing the composite fiber material, it is possible to dye in one bath of the polyester side and the synthetic polyamide side, and further, the number of steps including the post-process can be greatly reduced, and wet fastness is included. It was also found that various fastnesses were improved and high-quality dyeings could be obtained.

  In addition, for medium-colored and dark-colored dyeings, etc., the wet fastness may be insufficient even by the above-mentioned means, but the present inventor, by applying an acid reduction treatment to the obtained dyed goods, It has been found that such problems can be solved and both fibers can be dyed firmly in the same color. The present invention has been completed as a result of such studies.

  The first aspect of the present invention is a method for dyeing a composite fiber material containing polyester and synthetic polyamide, wherein the composite fiber material is a disperse dye, an acid dye or an acid-containing metal dye, and in the initial stage of dyeing. Condensation-type fixing agent or condensation-type fixing agent and pH which keeps dye-bath pH outside the range of 5.0-6.5 and slides dye-bath pH within the range of 5.0 or more and 6.5 or less during dyeing The present invention provides a method for dyeing a composite fiber material characterized by including a step of dyeing in a one-bath system in a dye bath containing a combination with a slide agent.

That is, the dyeing bath used in the dyeing method for the composite fiber material of the first aspect is as follows. ~ 3. Is included.
1. 1. Disperse dye 2. Acid dye or acid metal-containing dye Condensation type fixing agent or combination of condensing type fixing agent and pH slide agent

  According to this first aspect, the fixture process can be performed during dyeing, and the number of steps can be reduced only in this respect. Furthermore, it is possible to dye polyester and synthetic polyamide in one bath, and various fastnesses including wet fastness are improved, and a high-quality dyed product is obtained.

  The present invention also provides a method for dyeing a composite fiber material containing polyester and synthetic polyamide as a second embodiment, wherein the composite fiber is used in a dye bath containing a disperse dye and an acid dye or an acid-containing metal dye. The present invention also provides a method for dyeing a composite fiber material characterized by including a step of removing a disperse dye dyed on a synthetic polyamide by acid reduction after dyeing the material.

  A combination of the first aspect and the second aspect, that is, a method for dyeing a composite fiber material containing polyester and synthetic polyamide, wherein the composite fiber material comprises a disperse dye, an acid dye, or an acid-containing metal dye, and Condensation type fixing agent or condensation type that maintains the dye bath pH outside the range of 5.0 to 6.5 in the initial stage of dyeing and slides the dye bath pH within the range of 5.0 to 6.5 during dyeing A dye bath containing a combination of a fixing agent and a pH slide agent is dyed by a one-bath system, and then a step of removing the disperse dye dyed on the synthetic polyamide by performing acid reduction is performed. The dyeing method of the composite fiber material is more preferable. According to this method, the number of steps can be significantly reduced, and various color fastnesses, including wet fastnesses, can be obtained for medium-color and dark-colored dyeings, and high-quality dyeings can be obtained.

  The composite fiber material to which the present invention is applied contains polyester fiber and synthetic polyamide fiber. Although it does not specifically limit as a polyester fiber, The raw material which can be dye | stained with a disperse dye at 95 to 130 degreeC is illustrated preferably. Moreover, although it does not specifically limit as a synthetic polyamide fiber, 6-nylon and 6, 6-nylon are illustrated.

  The mixing ratio of polyester and synthetic polyamide is not particularly limited. Usually, polyester: 80 to 50% by weight (hereinafter, unless otherwise specified, “%” represents “% by weight”) and synthetic polyamide: 20 to 50% are preferable. However, even if the composite fiber material is outside this range, the present invention can be applied by appropriately changing the mixing ratio of the disperse dye used for dyeing and the acid dye or the acid-containing metal dye. Excellent effect is obtained.

  The composite fiber material to which the present invention is applied may contain fibers other than polyester fibers and synthetic polyamide fibers, such as cellulose fibers. When cellulose fiber or the like is contained, dyeing by a one-bath system is difficult, and dyeing by a two-bath system may occur. However, even in this case, according to the present invention, the number of steps can be greatly reduced as compared with the dyeing of the composite fiber material by the conventional method, which is extremely advantageous economically.

  The acidic dye or acidic metal-containing dye contained in the dye bath used in the present invention is not particularly limited. Preferably, the following dyes are exemplified.

  Lanyl Yellow GR, Lanyl Brill. Yellow 3G, Lanyl Yellow G, Lanyl Orange R, Lanyl Red B, Lanyl Blue 3G, Lanyl Bill. Blue G, Lanyl Gray BG, Lanyl Black BG, Lanyl Navy Blue TW (manufactured by Sumitomo Chemical Co., Ltd.), Lanasyn Yellow S-2GL, Lanasin Yellow 2RL, Lansyn OrangeL Neutrichrome Bordeux MB (manufactured by Yorkshire).

  In addition, in the case of dyeing, etc. in medium color and dark color, after dyeing, an acid reduction treatment may be applied to improve wet fastness. In this case, as an acid dye or an acidic metal-containing dye, There is a need to select dyes that are not removed or do not significantly discolor.

  The disperse dye contained in the dye bath used in the present invention is mainly used for dyeing the polyester side. As described above, the dye is considerably dyed on the synthetic polyamide during dyeing under high temperature. In addition, this causes a decrease in wet fastness. Therefore, preferably, a disperse dye with little dyeing to the synthetic polyamide is used. The following disperse dyes are illustrated as disperse dyes with little dyeing to a synthetic polyamide.

  Sumikaron Yellow E-RPD, Sumikaron Yellow SE-RPD, Sumikaron Yellow SE-3GL, Sumikaron Orange SE-RPD, Sumikaron Orange SE-RBL, Sumikaron Red S-RPL, Sumikaron Red S-RPL E-FBL, Sumikaron Blue E-RPD, Sumikaron UL Blue GF, Sumikaron Turq. Blue GL (manufactured by Sumitomo Chemical Co., Ltd.).

  Instead of disperse dyes with little dyeing on synthetic polyamides, dyeing on synthetic polyamides cannot be avoided, but it is also preferable to select disperse dyes that are fast since the wet fastness is improved. Examples of this type of disperse dye include the following dyes.

  Sumikaron Yellow SE-4G, Sumikaron Yellow Brown S-BRF, Sumikaron Bill. Red S-BLF, Sumikaron Brill. Red S-BF, Sumikaron Brill. Pink SE-RL (N), Sumikaron Blue S-BB (manufactured by Sumitomo Chemical Co., Ltd.), Miketon Polyester Red 2BSF, Miketon Polyester Blue TSF (manufactured by Dystar).

  Thus, wet fastness improves by selecting the disperse dye with few dyeings to a synthetic polyamide, or selecting the fast disperse dye. In some cases, the selection of such disperse dyes, such as some light-colored dyeings, can solve the problem of reduced wet fastness. However, according to the present invention, it is possible to further improve the wet fastness even when the conventional dyeing method cannot prevent the decrease in wet fastness. That is, the wetness caused by the disperse dye according to the feature of the present invention that the selected fixer or a combination of a fixer and a pH slide agent and the like, and the acid dye or the acid-containing metal dye are contained in one bath. The decrease in fastness is suppressed.

  Further, there are cases in which a decrease in wet fastness due to dyeing of a disperse dye on a synthetic polyamide, such as dyeing in medium color or dark color, is more likely to occur. In this case, a composite fiber containing polyester and synthetic polyamide The wet fastness can be further improved by removing the disperse dyes dyed on the synthetic polyamide by acid reduction after dyeing the material.

  Conventionally, an alkali reduction method using caustic soda and hydrosulfite has been widely adopted as a method for removing undyed disperse dyes on the fiber surface. In this method, disperse dyes dyed in synthetic polyamide fibers are removed. It was difficult to do. As a result of the study, the present inventor has found that, by acid reduction, many disperse dyes can be removed even if they are dyed on a synthetic polyamide. By performing acid reduction after dyeing, excellent wet fastness can be obtained even when a disperse dye that gives only a dyed product with low wet fastness by a conventional method is used.

  When performing acid reduction, it is preferable to select a dye that can be easily removed by acid reduction as the disperse dye. Examples of such disperse dyes include, but are not limited to, the following dyes.

  Sumikaron Yellow Brown S-2RL, Sumikaron Red S-3BFL, Sumikaron Rubin SE-RPD, Sumikaron Rubin SE-GL, Sumikaron Red S-BL, Sumikaron Red S-BL, Sumikaron Navy S BBL (above, manufactured by Sumitomo Chemical Co., Ltd.), Kayalon Polyester Red TLSF (manufactured by Nippon Kayaku Co., Ltd.).

  The condensation-type fixing agent used in the first aspect of the present invention or the combination of the condensation-type fixing agent and the pH slide agent keeps the dye bath pH outside the range of 5.0 to 6.5 and dyes at the initial stage of dyeing. Inside, the dye bath pH is slid within a range of 5.0 or more and 6.5 or less. In the present invention, the condensation-type fixing agent or the combination of the condensation-type fixing agent and the pH slide agent is added to a dyeing bath together with a dye and other agents.

  Conventionally, the fixing treatment for improving the wet fastness is usually performed after dyeing, washing with water, and then adding a fixing agent. This is because when adding a general fixing agent in the state of an anionic dye or dispersing agent, it binds to the dye or dispersing agent to form agglomerates and adheres to the fiber surface, greatly increasing the friction fastness. This is because troubles often occur, and the light fastness of the dyed product often decreases.

  As a result of the study, the inventor kept the dye bath pH outside the range of 5.0 to 6.5 in the initial stage of dyeing, and within the range of 5.0 or more and 6.5 or less during dyeing. Condensation-type fixing agent or a combination of condensing-type fixing agent and pH-sliding agent, keeping the dye bath pH outside the range of 5.0 to 6.5 at the initial stage of dyeing, and dye bath pH during dyeing By using a material that slides within the range of 5.0 or more and 6.5 or less, even if these are added during dyeing bath, the above-mentioned problem does not occur, and the fixing effect is exhibited during dyeing. It has been found that an improvement in wet fastness can also be achieved.

  That is, by maintaining the dye bath pH outside the range of 5.0 to 6.5 in the initial stage of dyeing, the condensation-type fixing agent or the combination of the condensation-type fixing agent and the pH-sliding agent causes a bond with a dye or the like. In addition, no aggregates are formed. Therefore, troubles such as adhering to the fiber surface and drastically lowering the fastness to friction do not occur. On the other hand, when the dyeing bath pH is slid within the range of 5.0 to 6.5 as the dyeing progresses, an excellent fixing effect can be exhibited and excellent fastness can be achieved.

  Condensation-type fixing agents that maintain the dye bath pH outside the range of 5.0 to 6.5 in the initial stage of dyeing and slide the dye bath pH within the range of 5.0 to 6.5 during dyeing include fragrance A condensate of a group oxysulfonic acid is exemplified. More specifically, the same sticker Y (manufactured by Shichifuku Chemical Co., Ltd., hereinafter referred to as “fixing agent A”) and the like can be mentioned.

  More preferably, the condensation-type fixing agent is used in combination with a pH slide agent. That is, in order to improve the wet fastness, it is very important that the fixing of the dye by the fixing agent is formed in the synthetic polyamide fiber. For this purpose, the dye is dyed quickly and uniformly and to the maximum amount. Most preferably, the fixing of the dye in the fiber by the fixing agent is started in a timely manner. This effect can be achieved more effectively by the combination of the condensation-type fixing agent and the pH slide agent.

  As such a pH slide agent, a pH slide agent comprising an organic acid and an organic salt thereof is preferable. For example, nonionic Meisan PC (manufactured by Meisei Chemical Industry Co., Ltd., hereinafter referred to as pH slide agent C) is preferably exemplified. . The amount of the fixing agent and the pH slide agent used in the dye bath used in the present invention is 1.0 to 5.0% o. w. f. The range of is preferable.

Next, problems on the polyester side in the present invention and their solutions will be described.
In the present invention, dyes necessary for dyeing a composite material composed of two kinds of fibers, all of the medicine are prepared in one bath and dyed, so that they are contained in the obstacles, for example, disperse dyes. Attention should be paid to deterioration of dye dispersibility due to an anionic dispersant and a fixing agent in the same bath. Further, since it is not dyeing with polyester alone, it is desirable to set the dyeing temperature as low as possible, and it is desirable to be able to dye uniformly at a high density even if it is set low.

  Therefore, preferably, in order to solve this problem, a leveling agent that exhibits transferability even in dyeing including an acid dye or the like and uniformly dyes polyester fibers is used. An example of the leveling agent is a surfactant. Among them, Ionet RPD-250 (manufactured by Sanyo Chemical Industries, Ltd., hereinafter referred to as leveling agent B), which works effectively during dyeing in one bath of the present invention, is preferably exemplified. This shows nonionic and anionic properties, and shows a stable effect with no trouble occurring in the dyeing bath of the present invention by addition of 0.2 to 2 g / l.

  The agent used for the dyeing bath of the present invention has been described above. However, in an actual dyeing process, a dyeing assistant or the like can be further used depending on the complex tissue structure of the object to be dyed. Examples of the dyeing assistant include a smoothing agent, a penetrating agent, a dispersing agent, and the like, but these can be used in combination, and no problem occurs.

  According to the method for dyeing a composite fiber material of the present invention, the polyester side and the synthetic polyamide side are dyed in a single bath, and a fixing agent or the like is also added during dyeing. High quality dyeings can be obtained. Therefore, it is a very economical dyeing method for a composite fiber material containing polyester and synthetic polyamide. In addition, by performing an acid reduction treatment as a post-treatment step, the disperse dye dyed on the synthetic polyamide side is removed, and the reduction in wet fastness due to this dyeing can be prevented. Allows selection.

The best mode for carrying out the present invention, that is, a specific dyeing prescription and dyeing conditions will be described, but the present invention is not limited to this form.
Examples of dyeing prescriptions for light dyeing are shown below.

Dye (Total of disperse dye and acid dye or acid metal-containing dye)
1.0% o. w. f. Based on the following.
Fixing agent A 5% o. w. f.
Leveling agent B 0.4g / l
PH slide agent C 5g / l
Bath ratio 1:20

The example of the dyeing | staining conditions in light dyeing is shown.
The disperse dye is dispersed with hot water of about 40 ° C. Next, the acidic dye or the like is dissolved in hot water at about 80 ° C. You may use the dye which mixed both these beforehand. The mixing ratio can be changed according to the composition of the article to be dyed.

  To this, leveling agent B, PH slide agent C, and fixing agent A are added and dissolved in this order, and the total amount is made a dyeing bath of 20 times the dyed weight (bath ratio 1:20). The material to be dyed is put into this, and the temperature is raised from 60 ° C. to 95 ° C. at about 1.5 ° C. per minute. After dyeing for 30 minutes at the same temperature, the solution is drained, washed with water or washed with water. If necessary, general soaping may be performed. Based on this condition, both fibers can be dyed firmly in the same color in a short time of about 1/3 of the conventional two-bath system.

Examples of dyeing prescriptions for medium and dark dyeing are shown below.
Dye (Total of disperse dye and acid dye or acid metal-containing dye)
1.5% o. For medium color. w. f. Based on the following.
Leveling agent B 0.3g / l
PH slide agent C 5.0 g / l
(Acetic acid 0.1-2% ow f. As required)
Fixing agent A 5.0% o. w. f.
Bath ratio 1:20

Examples of dyeing conditions for medium and dark dyeing are shown below.
The disperse dye is dispersed with hot water of about 40 ° C. Next, the acidic metal-containing dye or the like is dissolved in 80 ° C. hot water. Moreover, you may use the dye which mixed both these beforehand. The mixing ratio can be changed according to the composition or concentration of the article to be dyed.

  To this, leveling agent B, PH slide agent C, and fixing agent A are added and dissolved in this order, and the total amount is set to a dyeing bath 20 times that of the object to be dyed. The material to be dyed is put in this, and the temperature is raised from 50 ° C. to 120 ° C. to 130 ° C. at about 3 ° C. per minute and dyed at the same temperature for 30 to 60 minutes. The temperature should be low, but it must be high for dark colors. Although it is preferable that the time is short, it can be appropriately changed depending on the concentration and the dye.

  After dyeing, drain, wash with water, and perform sufficient washing such as soaping. If the wet fastness is good, it may be possible to finish it as it is. However, when the wet fastness is poor, such as in the case of a dark color, it is necessary to perform acid reduction. That is, an acid reduction treatment is performed by adding a dyed product and an acidic reducing agent to an acidified bath. Examples of the acidic reducing agent include Redol C Powder (manufactured by Sumitomo Chemical Co., Ltd.).

  For example, when the dyed product is subjected to an acid reduction treatment at 70 ° C. for about 20 minutes in a treatment bath having a bath ratio of 1:30 of 4 g / l of a reducing agent Redol C Powder and 1 cc / l of acetic acid, a synthetic polyamide Most of the disperse dyes dyed on the surface can be removed to greatly improve the fastness. In this case, since it is important that the acidic metal-containing dye dyed on the synthetic polyamide fiber is not removed and remains as it is, it is preferable to select and use such a dye. An alkaline reduction treatment may be performed after the acidic reduction treatment. For example, after the above acidic reduction treatment, washing with water and alkali reduction treatment (reducing agent hydrosulfite 1 to 2 g / l, caustic soda 1 g / l at 70 ° C. for 20 minutes) result in residual dye on the fiber surface. It may be removed and the wet fastness may be further improved.

  Medium and dark dyeing, especially Black dyeing, often requires this acid reduction treatment, but the dyeing method of the present invention including this post-treatment achieves a significant improvement in wet fastness while significantly reducing time. It can be used for the practical use of dyeing processing excellent in quality and economy. In addition, although the method by an oxidation system is also used for decolorization of a dye, since synthetic polyamide is said to be weak to an oxidation action and may deteriorate by oxidation, it is not generally adopted as a material containing synthetic polyamide. .

  Next, the present invention will be described in detail with reference to the following examples. However, the examples do not limit the scope of the present invention.

  Disperse dye Sumikaron Yellow Brown S-BRF (manufactured by Sumitomo Chemical Co., Ltd.) 3.0% o. w. f. , Kayacelon Polyester Red TLSF (manufactured by Nippon Kayaku Co., Ltd.) 1.55% o. w. f. , Miketon Polyester Blue TSF (Dystar) 1.55% o. w. f. Sumikaron Navy Blue S-GL extra conc. 1.86% o. w. f. And Lanasyn Black SDL (manufactured by Clariant) 1.86% o. w. f. Staining density, leveling agent B 0.3 g / l, and pH slide agent C 5 g / l, acetic acid 1% o.d. w. f. A dye bath with a bath ratio of 1:20 was prepared. Dyeing is started by introducing a composite fiber material (woven fabric) made of regular polyester / 6-nylon / polyurethane (25/70/5) into this dye bath, and the temperature is raised to 122 ° C. at 3 ° C. per minute. After dyeing at temperature for 60 minutes, the solution was drained and washed with water. Next, as a post-treatment, a reducing agent Redol C Powder (manufactured by Sumitomo Chemical Co., Ltd.) 4 g / l, acetic acid 1 cc / l, a post-treatment bath with a bath ratio of 1:20 at 70 ° C. for 20 minutes, The liquid was drained, washed with water, washed with hot water (about 50 ° C.), washed with water and dried to finish.

  A thick black-colored dyeing was obtained, and the wet fastness was JIS washing fastness (A-3) and wet friction fastness. When the post-treatment according to the present invention was not performed, the fastness was poor and could not be put to practical use, and the present invention succeeded in greatly improving it.

  In the same dyebath as in Example 1, Fixing Agent A 5% o. w. f. The same dyeing and post-treatment were performed. As a result, the fastness to washing was improved by about 1st class, and the 4-5th grade was obtained, and a high-quality dyed product was obtained.

  Sumikaron Yellow Brown S-BRF (Sumitomo Chemical Co., Ltd.) 0.032% o. w. f. Lanyl Yellow GR extra conc. (Sumitomo Chemical Co., Ltd.) 0.006% o. w. f. Kayalon Polyester Red TLSF (Nippon Kayaku Co., Ltd.) 0.01% o. w. f. , C.I. I. No Acid. Rubin 531 0.001% o. w. f. , And 87.6% of Miketon Polyester Blue TSF (manufactured by Dystar), Lanyl Bill. Blue G extra conc. 0.013% of mixed dye consisting of 3.8% (manufactured by Sumitomo Chemical Co., Ltd.) and 8.6% of Lanyl Navy Blue TW (manufactured by Sumitomo Chemical Co., Ltd.) w. f. Concentration leveling agent B 0.4 g / l, pH slide agent C 5 g / l, and Fixing agent A 5% o.d. w. f. A dye bath with a bath ratio of 1:20 was prepared. In this dyeing bath, a composite fiber material (woven fabric) of regular polyester / 6-nylon / polyurethane (25/70/5) is added to start dyeing, and the temperature is raised to 95 ° C. at 1.5 ° C. per minute. After dyeing at the same temperature for 30 minutes, it was finished by washing with water and hot water. Dye selected for light color and leveling agent B, PH slide agent C, and fixing agent are combined to obtain an excellent dyed product with uniform beige color fastness to washing (A-3). Could be put to practical use.

  Disperse dye Sumikaron Yellow Brown S-BRF (manufactured by Sumitomo Chemical Co., Ltd.) 2.1% o.d. w. f. Kaylon Polyester Red TLSF (Nippon Kayaku Co., Ltd.) 1.1% o. w. f. Miketon Polyester Blue TSF (manufactured by Dystar) 1.1% o. w. f. And Sumikaron Navy Blue S-GL extra conc. (Sumitomo Chemical Co., Ltd.) 1.3% o. w. f. Lanasyn Black S.DL (manufactured by Clariant) 1.3% o. w. f. Dyeing density, leveling agent B 0.3 g / l, pH slide agent C, and fixing agent A 5.0% o. w. f. A dye bath with a bath ratio of 1:20 was prepared. A composite fiber material (knitted fabric) made of regular polyester / 6,6-nylon / rayon / polyurethane (20/55/20/5) is put into this dye bath, dyed under the same conditions as in Example 1, and post-treated. The liquid was drained and washed with water.

Subsequently, at the second bath, Multifix Black N-DF 3.15% o.D. w. f. , Multifix Yellow N-2RF 1.3% o. w. f. , Multifix Red N-BF 0.14% o. w. f. After dyeing at 95-100 ° C. for 50 minutes using a dye bath having a bath ratio of 1:20 consisting of 80 g / l of anhydrous sodium sulfate, the temperature was lowered to 70 ° C. and then 20 g / l of anhydrous sodium carbonate was added. In addition, it was treated for 50 minutes to stain the rayon side. And it finished by performing normal water washing, hot water washing, soaping, hot water washing, and water washing. Washing fastness (A-3) of the resulting thick black dyeing clears grade 4, indicating high fastness. Although this example was performed in a two-bath system, the conventional method requires three or more baths, so that the number of steps can be reduced by the present invention, and significant rationalization is achieved.

Claims (4)

  A method for dyeing a composite fiber material containing polyester and synthetic polyamide, wherein the composite fiber material has a disperse dye, an acid dye or an acid metal-containing dye, and a dye bath pH of 5.0 to 6.5 in the initial stage of dyeing. A dye bath containing a condensation-type fixing agent or a combination of a condensation-type fixing agent and a pH-sliding agent that keeps the dye bath pH within the range of 5.0 or more and 6.5 or less while dyeing A method for dyeing a composite fiber material, comprising a step of dyeing in a one-bath system.   The method for dyeing a composite fiber material according to claim 1, wherein the dye bath further contains a leveling agent. A method for dyeing a composite fiber material containing polyester and synthetic polyamide, wherein the composite fiber material is dyed in a dye bath containing a disperse dye and an acid dye or an acid-containing metal dye, and then subjected to acid reduction and synthesized. The method for dyeing a composite fiber material according to claim 1, further comprising a step of removing the disperse dye dyed on the polyamide.
A method for dyeing a composite fiber material containing polyester and synthetic polyamide, wherein the composite fiber material has a disperse dye, an acid dye or an acid metal-containing dye, and a dye bath pH of 5.0 to 6.5 in the initial stage of dyeing. In a dye bath containing a condensation-type fixing agent or a combination of a condensation-type fixing agent and a pH-sliding agent that keeps the dye bath pH within the range of 5.0 or more and 6.5 or less during dyeing. A method for dyeing a composite fiber material, comprising a step of dyeing in a one-bath system, and a step of removing the disperse dye dyed on the synthetic polyamide by performing acid reduction after the step.