JP2003336180A - Method for scouring, bleaching and dyeing fiber by one bath - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a method for scouring, bleaching and dyeing a fiber by one bath, capable of decomposing and removing stain and dust discharged when a fiber is scoured and bleached without impairing the fiber and obtaining an equivalent dyeing property as much as possible compared with a conventional method. <P>SOLUTION: In the method for carrying out scouring, bleaching and dyeing of a cellulosic fiber by the same bath, a step for adding a decomposition promoter of hydrogen peroxide to the interior of the bath after bleaching is carried out by adding an aqueous solution of hydrogen peroxide in an amount of 4-21 g/l is carried out and a dye is added to the interior of the bath to carry out dyeing of the fiber. <P>COPYRIGHT: (C)2004,JPO

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for performing scouring, bleaching and dyeing treatments on cellulose fibers in the same bath,
The present invention relates to a one-bath scouring bleach-dyeing method in which bleaching is performed with hydrogen peroxide. In addition, in this invention, a fiber is used in the meaning including a yarn, cloth, and various fiber products. [0002] In the processing of fibers such as cellulose fibers, scouring and bleaching of the fibers are performed in the same bath, and after the scouring and bleaching bath is once discharged, the process proceeds to a dyeing process. This is commonly done. At the time of transition to the dyeing step, the bath liquid subjected to scouring and bleaching is once drained, freshly added and washed with water, and after draining this water, new water is added to perform the dyeing step. . Therefore, since the dyeing process is performed in hot water or hot water (40 to 100 ° C.), a large amount of water is consumed in replacing the water and energy is consumed by heating. In order to solve such consumption of water and energy, Japanese Patent Application Laid-Open No. 2000-80574 discloses a method in which scouring and bleaching are performed in the same bath using a known scouring agent and hydrogen peroxide as a bleaching agent. After that, a one-bath scouring bleach-dyeing method is proposed in which the hydrogen peroxide is decomposed using a metal salt in the same bath, and then dyeing is performed using a dye in the same bath. [0004] However, this single-bath scouring bleach-dyeing method involves refining, bleaching and dyeing of fibers in the same bath and dyeing without washing the inside of the bath. Since the dirt and dust generated during the scouring and bleaching of the fibers remain in the bath, the dirt and dust remaining in the bath may adhere to the fibers during dyeing, resulting in uneven dyeing. Accordingly, the single-bath scouring / bleaching / dyeing method has a problem that the dyeability is still insufficient compared with the conventional method of performing scouring / bleaching / dyeing after draining and washing the bath after scouring and bleaching once and washing with water. Had. On the other hand, scouring, bleaching,
In the course of the dyeing process, damage to the treated fibers must be minimized. [0005] It is an object of the present invention to provide a fiber without damaging the fiber.
To provide a one-bath scouring bleach-dyeing method capable of decomposing and removing dirt and dust generated at the time of fiber scouring / bleaching and obtaining the same dyeability as possible as compared with the conventional method. is there. Means for Solving the Problems Accordingly, the present inventors have
In a method in which scouring, bleaching and dyeing of fibers, especially cellulose fibers, are performed in the same bath, the amount of hydrogen peroxide in the bath is 4 to 21 g.
/ L hydrogen peroxide solution is added to the solution to perform bleaching, and then a step of adding a hydrogen peroxide decomposition accelerator to the bath is performed, and then a dye is added to the bath to perform dyeing. If the single-bath scouring bleach dyeing method, the dust is decomposed along with the bleaching of the fibers by hydrogen peroxide and the dust derived from the fibers in the bath can be removed, and the scouring and bleaching bath liquid is once drained, Dyeability equivalent to the method of scouring / bleaching / dyeing after washing with water can be secured.
Moreover, if hydrogen peroxide having an amount of 4 to 21 g / L of hydrogen peroxide is added to the bath, the cellulose fibers can be bleached without embrittlement of the fibers by hydrogen peroxide and damaging the fibers. . Further, by adding a hydrogen peroxide decomposition accelerator, it is also possible to use a dye which is decomposed by peroxide remaining after the bleaching treatment. [0007] The present invention provides a method for scouring, bleaching,
In a method in which dyeing is performed in the same bath, bleaching is performed by adding a hydrogen peroxide solution having an amount of hydrogen peroxide of 4 to 21 g / L to the bath, and then a hydrogen peroxide decomposition accelerator is added to the bath. , Followed by dyeing in the bath for dyeing. In the present invention, bleaching is performed by adding a hydrogen peroxide solution having a hydrogen peroxide amount of 4 to 21 g / L to the bath, but this indicates the amount added based on the concentration at the time of scouring. In addition, as the hydrogen peroxide solution having an amount of hydrogen peroxide of 4 to 21 g / L, for example, a hydrogen peroxide solution having a concentration of 35% by weight is used.
It is obtained by adjusting the ml / L, but is not limited to this. DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for scouring, bleaching and dyeing cellulose fibers in the same bath. In performing scouring and bleaching in the same bath, peroxide is used as the bleaching agent in the bath. After bleaching by adding a hydrogen peroxide solution having a hydrogen amount of 4 to 21 g / L, a step of adding a hydrogen peroxide decomposition accelerator to the bath is performed, and then a dye is added to the bath. This is a one-bath scouring bleach dyeing method for dyeing. This one-bath scouring bleach-dyeing method is a method in which scouring, bleaching, decomposition of hydrogen peroxide and dyeing of the cellulose fiber are performed in the same bath, and the water in the bath is replaced with new water. There is no way. In the present invention, the bleaching agent for cellulose fibers is carried out with oxygen peroxide. Specifically, a hydrogen peroxide solution having an amount of hydrogen peroxide of 4 to 21 g / L (for example, 35% by weight) Hydrogen peroxide solution of 10 to 50 ml / L)
Is carried out by immersing the cellulose fibers in a bath solution to which is added. The bleaching step is performed in the same bath as the refining step of refining cellulose, but the bleaching step may be performed after the refining step. Are preferably performed simultaneously. When performing the scouring step and the bleaching step at the same time, to the water in the same bath, add a scouring agent, a hydrogen peroxide solution that is a bleaching agent and an alkali agent, and further add sodium sulfate as needed,
This is performed by immersing the cellulose fibers in the bath.
The scouring agent is not particularly limited as long as it has scouring properties without affecting the subsequent dyeing. For example, Mignol SD-77, wet softer D-57
8. A dyeing aid having a refining property such as wet softer LZ (above, on the other hand, Ongaku Yushi Kogyo Co., Ltd.) may be used. As the alkaline agent, soda ash or a liquid alkaline agent can be used as a known alkaline agent, but in the case of soda ash, adjustment (partial neutralization) of the amount of residual alkali introduced from the scouring step is required. Therefore, it is preferable to use a liquid alkaline agent. The bleaching step of the present invention is carried out by adding a hydrogen peroxide solution having a hydrogen peroxide amount of 4 to 21 g / L, for example, a hydrogen peroxide solution having a concentration of 35% by weight, to 50 to 50 ml / L, in a bath. Is preferably performed with the above-mentioned aqueous hydrogen peroxide having a hydrogen peroxide amount of 5 to 17 g / L (for example, 12 to 40 ml / L for a hydrogen peroxide having a concentration of 35% by weight), and a hydrogen peroxide amount of 6 to 13 g. / L hydrogen peroxide solution (for example, concentration 3
More preferably, the reaction is performed at 15 to 30 ml / L for 5% by weight of hydrogen peroxide. When the addition amount of the hydrogen peroxide solution is less than 4 g / L (for example, 10 ml / L for a hydrogen peroxide having a concentration of 35% by weight), dirt and the like in the bath cannot be sufficiently decomposed, Insufficient dyeability. If the amount of the hydrogen peroxide solution is more than 21 g / L (for example, 50 ml / L for a hydrogen peroxide having a concentration of 35% by weight), the fibers are oxidized and thus become brittle and damage the fibers. . The cellulose fiber is not particularly limited as long as it is a fiber having cellulose as a main skeleton, and examples thereof include cotton, rayon, Tencel, and lyocell. The cellulose fibers can be scoured and bleached by immersing them in a bath ratio of 1: 5 to 1:50. In the one-bath scouring bleach-dyeing method of the present invention,
Glauber's salt can be used to improve the affinity between the fiber and the dye. Glauber's salt may be added from the time of refining, and when the refining is inhibited depending on the type of refining agent, it may be added at any stage after the refining process but before dyeing. In the one-bath scouring bleach-dyeing method of the present invention, after scouring and bleaching and before dyeing, a step of adding a hydrogen peroxide decomposition accelerator to the bath is performed to decompose the hydrogen peroxide. . The hydrogen peroxide decomposition promoter is not particularly limited, and a reducing agent such as sodium thiosulfate or hydrosulfite, a hydrogen peroxide decomposition enzyme represented by catalase, or a transition metal salt can be used. Among them, metal salts that do not need to be added in an equivalent amount to hydrogen peroxide, particularly cobalt salts, iron salts, and rubidium salts, are preferable because they exhibit a small amount of hydrogen peroxide decomposition promoting effect. The hydrogen peroxide decomposer used in the present invention is preferably a metal salt of at least one of a cobalt salt, an iron salt and a rubidium salt. For example,
Specific examples of the cobalt salt include cobalt acetates (II) and (III), cobalt carbonates (II) and (III), cobalt oxides (II) and (III), cobalt sulfates (II) and (II).
I), cobalt (II) chloride, (III), (IV), cobalt (II) bromide, cobalt (II) iodide and the like can be used, but cobalt acetate, cobalt sulfate, particularly cobalt acetate is preferred. Specific examples of the iron salt include iron acetate (II), (III), iron carbonate (II), iron oxide (II),
(III), iron (II) sulfate, (III), iron (II) chloride, (II)
I), iron (II), (III) bromide, iron (II) iodide and the like can be used, but iron oxide (II), (III), iron chloride (I
I) and (III), particularly iron oxides (II) and (III) are preferred. Further, as the rubidium salt, specifically, rubidium acetate (II), (III), rubidium carbonate (I
I), rubidium oxides (II) and (III), rubidium sulfates (II) and (III), rubidium chlorides (II) and (III), and rubidium bromide (II) and (III) can be used. , Rubidium carbonate and rubidium oxide are preferable, and rubidium oxide is particularly preferable. Note that it is preferable to use cobalt acetate from the viewpoint of the hydrogen peroxide decomposition effect. The amount of the metal salt added, in particular, at least one or more of the cobalt salt, the iron salt and the rubidium salt is 1 to 1000
ppm, more preferably 1 to 200 ppm. The dye used in the one-bath scouring bleach-dyeing method of the present invention is characterized in that hydrogen peroxide is decomposed before dyeing.
There is no particular limitation, and any of reactive dyes and direct dyes can be used. Hot dyes, V.I.
S. Type or Supra type can be used. However, when a direct dye is used, it is necessary to adjust the amount of alkali in the bath (partial neutralization) at the time of dyeing. EXAMPLES Examples of the present invention and comparative examples will be shown below.
The present invention is not limited to the following. (Examples and Comparative Examples) Each step of scouring, bleaching and dyeing treatments was carried out according to the working conditions shown in FIG. That is, a scouring agent, NaOH, hydrogen peroxide, sodium silicate, and sodium sulfate were added to water in a bath, and a test cloth was immersed at a bath ratio shown in FIG.
The mixture was heated to 00 ° C., and scouring and bleaching were performed while holding the mixture for 60 minutes. Thereafter, a hydrogen peroxide decomposition accelerator was added at the bath ratio shown in FIG. 1, and after maintaining for 30 minutes, the bath temperature was set to 60 ° C. over 20 minutes. The bath that has reached 60 ° C has a bath temperature of 60 ° C for 5
After holding for 1 minute, the dye was added to the bath, and after 5 minutes, an alkali agent was added, and the solution was held for 30 minutes, and then returned to room temperature for dyeing. The raw materials and compositions of the chemicals, test cloths and the like used in this one-bath scouring bleach-dyeing method are as follows:
The amounts used are as shown in Table 1. The amounts used are the concentrations during scouring for the amounts of scouring agent, NaOH, aqueous hydrogen peroxide and sodium silicate, and the concentrations at the time of decomposition of hydrogen peroxide for the decomposition accelerators. Is the final staining concentration. Scouring agent: trade name "Mignol SD-7"
7 ", on the other hand, NaOH: Reagent hydrogen peroxide solution: 35% by weight hydrogen peroxide solution (reagent) Test cloth: Commercial cotton knit fabric Hydrogen peroxide decomposition accelerator: Cobalt acetate (II) Dye: The following three kinds of mixed dyes CI Reactive Yellow 17: 1%
owf CI Reactive Red 21: 1% owf CI Reactive Blue 19: 1% owf Alkaline agent: trade name "Esporon A501", manufactured by Yushi Yushi Kogyo Co., Ltd. [Evaluation] The dyeing properties and brittleness of the dyed fabrics dyed by the one-bath scouring bleach dyeing process of Examples 1 to 4 and Comparative Examples 1 and 2 were evaluated. (Dyeing properties) The dyed fabrics dyed by the one-bath scouring bleach dyeing process of Examples 1 to 4 and Comparative Examples 1 and 2 were compared visually with dyed fabrics dyed separately from scouring and bleaching. The evaluation was based on evaluation criteria. A: Equivalent to a dyed cloth dyed separately from scouring and bleaching. 〇: Slight staining unevenness due to dust or the like is observed, but there is no practical problem. X: Uneven dyeing is easily recognized. A dyed fabric dyed separately from scouring and bleaching was prepared by the following method. A commercially available scouring bleached cloth was dyed under the working conditions shown in FIG. The sodium sulfate, the dye and the alkali agent were used in Examples 1 to 4 and Comparative Examples 1 and 2.
The same raw materials and the amounts used were used. (Brittleness) The dyed fabrics dyed by the one-bath scouring bleach dyeing process of Examples 1 to 4 and Comparative Examples 1 and 2 were visually evaluated according to the following evaluation criteria. ：: No embrittlement is observed at all〇: Slight embrittlement is observed, but there is no problem in practical strength. X: Embrittlement resistance was easily recognized, and a decrease in fiber strength was observed. (Results) From Table 1, it was found that Example 1 had a concentration of 3 in the bath.
In Examples 1 to 4 which were bleached by adding 5% by weight of aqueous hydrogen peroxide to 10 to 50 ml / L (the amount of hydrogen peroxide was 4 to 21 g / L), the dyeability was good without damaging the fibers. . In Example 1, since the amount of hydrogen peroxide added was relatively small, decomposition and removal of dust and the like were not complete, and slight dyeing unevenness was observed. Was not observed, and a good dyed cloth was obtained. Example 4
Is because the amount of hydrogen peroxide added was relatively large,
Although slight embrittlement was observed, there was no practical problem, no uneven dyeing was observed, and a good dyed cloth was obtained. In Examples 3 and 4, both dyeability and brittleness were good, and excellent dyed cloths were obtained. On the other hand, the dyeability of Comparative Example 1 was poor because the amount of hydrogen peroxide added was too small, and the brittleness of Comparative Example 2 was too large because the amount of hydrogen peroxide added was too large. Was bad. According to the single-bath scouring bleach-dyeing method of the present invention, when used for cellulose fiber, the amount of hydrogen peroxide in the bath is 4 to 2%.
Bleaching is performed by adding 1 g / L of hydrogen peroxide solution, so that dust in the bath is decomposed and removed without embrittlement and damage to the fibers, so that the dyeability is good and the cellulose fibers are good. A dyed cloth can be obtained.

[Brief description of the drawings] FIG. 1 is a diagram of the working conditions of the present invention. FIG. 2 is a diagram of dyeing operation conditions of a dyed cloth for evaluation.

Claims (1)

Claims: 1. A method for refining, bleaching and dyeing cellulose fibers in the same bath, wherein the amount of hydrogen peroxide is 4 to 2 in the bath.
After performing by adding 1 g / L of hydrogen peroxide, a hydrogen peroxide decomposition accelerator is added to the bath, and then a dye is added to the bath to perform dyeing. One bath scouring bleach dyeing method.