JPH0465586A - Dyeing of conjugate structure - Google Patents

Abstract

PURPOSE:To obtain the title dyed material having uniformity and excellent fastness, by dyeing a conjugate yarn structure containing polyester-based yarn and polyamide-based yarn in the dyeing bath using both disperse dye and specific dye to stand reducing cleaning by one-bath dyeing and reducing and cleaning under an acidic condition. CONSTITUTION:In dyeing a conjugate yarn structure comprising polyester-based yarn and polyamide-based yarn, the structure is dyed in a dyeing solution in the same bath using both disperse dye and dye having >=70% durability of reducing cleaning and containing sodium sulfonate group in the structure of dye by one-bath dyeing, reduced and cleaned under an acidic condition to give a high-quality dyed material having excellent fastness of dyeing uniformly by one bath.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a method for dyeing a composite fiber structure using both polyester fibers and polyamide fibers.

(Prior art) In recent years, splittable conjugate fibers made by joining polyester components and polyamide components have come to be used in many fields. , there is a need for highly efficient dyeing.

Conventionally, the dyeing method for such fiber structures has been to first dye polyester with a disperse dye in the case of a deep color, then treat it with an aqueous solution containing a reducing agent such as hydrosulfide, an alkali metal salt, and a surfactant. The most common method is a two-bath dyeing method in which polyamide is dyed with a dye that has an affinity for polyamide, such as an acid dye, an acidic metal complex dye, or a direct dye, followed by a fixing treatment or soaping treatment. However, since the two-bath dyeing method involves 11 complicated steps and reduces efficiency, attempts have been made to carry out this process in a bath.

For example, JP-A No. 82,2311887 describes a method in which a fiber structure containing polyamide and polyester is dyed under polyester conditions using a disperse dye, and zeification of nylon is suppressed by treatment with tannic acid. ing.

In addition, we can simultaneously dye polyester and polyamide by using a combination of disperse dyes that dye esters and dyes that have sodium sulfonate groups in their structures, such as acid dyes, acidic metal complex dyes, and direct dyes that dye polyamides. Methods of dyeing are also known.

Furthermore, a method has recently been devised in which polyester and polyamide are dyed simultaneously in one bath using a dispersed reactive dye.

(RH to be solved by the invention) However, in the above-mentioned conventional technology, it is essential to perform reduction cleaning of the disperse dye, and when performing reduction cleaning, the disperse dye that has contaminated the polyamide is not only removed; The dye having a sodium sulfonate group in the dyed structure of the polyamide is also removed at the same time, and the purpose is not achieved.As a result, only the polyester is dyed, leaving the polyamide almost white. In order to avoid this, a soaping method using an activator that removes Zζ without decomposing the dye is used instead of reduction washing that decomposes and removes the dye. This method works well for light colors, but for medium to dark colors, the color fastness of the product will be affected. Furthermore, when dyeing split-type ultrafine composite fibers, soaping with only an activator may not be able to sufficiently remove unstable dyes that have contaminated the boria fibers.

The present invention solves this problem, and provides the same hue and degree of dyeing as two-bath immersion dyeing using disperse dyes and acid dyes, and dyeing fastness! The purpose of the present invention is to provide a dyeing method suitable for synthetic am structures made of polyester and polyamide with high productivity, and particularly for fiber structures made of #I type polar @a fibers. be.

Means for Solving Problem C) The present invention uses a disperse dye and a sulfonic acid having a reduction washing durability of 7096 or higher in dyeing a composite IA structure containing polyester fibers and polyamide A fibers. It is characterized by dyeing in the same bath using a dye having a soda group in its structure, followed by reduction washing under acidic conditions.

Examples of the polyamide of the present invention include nylon 4, nylon 8, nylon 1, nylon 11, nylon 12, nylon 61B, nylon g, to, polymethaxylene adipamide, polyvaraxylylene decanamide, polybiscyclohexylmethanedecaneamide. and copolyamides containing these as components.

On the other hand, examples of polyesters include polyethylene terephthalate, polytetramethylene terephthalate, polyethyleneoxybenzoate, poly1,4-dimethylcyclohexane terephthalate, polypivalolactone, and copolyesters containing these as components.

The fiber structure referred to in this book'J@mei may be any fabric, fabric, or nonwoven fabric containing polyamide and polyester as described above, and especially when using the composite I fiber described later, it may be a napped product. In addition, if the amount of polyamide is 51% or more relative to the weight of the fiber structure, staining spots will occur, so the method of the present invention will be effective, and if the amount is at most 5G!, the occurrence of spots will be large. .Polyamide and polyester can be used in combinations such as mixed knitting, mixed weaving, blended spinning, etc., as well as composites made of both components!
Examples include a method of knitting and weaving using conjugate fibers, but the method of the present invention is particularly effective for fiber structures using composite fibers. Such composite fibers are those in which each single fiber after splitting is less than 1 denier, and in which the polyamide component and the polyester component are a single filament, one component is combined with the other component. Composite fibers that have a shape in which both components are joined without completely enclosing them, specifically composite fibers with a side-by-side type cross section, composite IA fibers with a side-by-side repeating type, and composite fibers with a side-by-side repeating type forming a hollow part. Other examples include composite fibers consisting of a component having a radial shape and a pond component having a shape that complements the radiant portion.

Next, a dye having a sodium sulfonate group in its structure that has a reduction washing durability of 70% or more (hereinafter sometimes referred to as a single Iζ dye) can be used under the dyeing conditions of a disperse dye (for example, 15
0°C for 1 hour) to measure the /S value, and then perform reduction washing with a reducing washing solution (e.g. sodium formaldehyde J (e.g. 90°C for 20 min I'tl) adjusted to pHs), K Examples of dyes whose reduction cleaning durability can be determined by measuring the /S value are as follows: Acid Red 97 Acid Brown 127 Acid Yellow 127 Direct Yellow 2 g Direct Blue 10 g Acid Black 155 Mu 1zen 8pion Red 2 W
(Manufactured by Hodogaya Chemical) Mu1zenmu n1lon dark
A dye selected from Blue TRL () can be used, but it is of course not limited thereto as long as it has resistance to reduction washing.

In the present invention, the above-mentioned dye and disperse dye are used in the same bath for dyeing. In such a case, it is preferable to use a dispersion leveling agent, a pH adjuster, etc. in combination. Also, dyeing can be done using disperse dye dyeing conditions, but in order to prevent the polyamide am from turning into a zeitge, at 110 to 130'C for 30 to 90 minutes, 1! Mode! Preferably, high-pressure staining is performed. After dyeing, polyamide Ia1/
0.6 to improve the reduction cleaning durability of the IA hue.
Preferably, the treatment is carried out with an aqueous solution containing 15 to 15% by weight of tannic acid, preferably 2 to 6% by weight. If the amount of tannic acid is greater than 151, the effect will be saturated, and tannic acid powder will adhere to the fiber structure after this treatment, which is not preferable. Such treatment is preferably carried out by immersing the fibers or ism products in an aqueous tannic acid solution, and the temperature of the aqueous solution is preferably room temperature to 100°C, particularly 70 to 90°C.

Other processing methods such as printing or spraying are also effective.

Next, smudge reduction cleaning. General Iζ cleaning is carried out under alkaline conditions using soda ash or caustic soda, but in this case acidic dyes etc. dyed on the polyamide tend to fall off and cannot be used in the present invention. The present invention is carried out under acidic conditions, preferably using a bath with a pH of S to G, more preferably S to 5.

Here, pH is the pHf value measured at the treatment temperature.

To adjust the pH, organic acids such as, but not limited to, formic acid and acetic acid can be used.

As a reducing agent, hydrosulfide (Na!52o4) is undesirable for reducing cleaning under natural conditions because the rate of bamboo debris is too high, and NaH802a CH2O・2Ht
O1ZnSO2m CH2O@H! 0, or Zn
Reducing agents that have a high reduction potential but are more stable, such as sodium formaldehyde sulfoxylate such as CH80t m HCHO' 2 or bilayered thiourea, are preferable, and these are added to the bath at a concentration of 0.1 to 8 Fi/l, preferably is O,S~4q
/l, especially from 2 to 4 g/l. In addition, the one-source treatment is carried out at 10 to 120°C, preferably 80 to 100'C.
in a bath for 10 to 60 minutes, preferably 15 to 30 minutes.

(Example) Example 1 A fabric with a fill structure made of warp polyester filament 76d/i$8f was split, scoured, and beat-set by a known method, and then raised using No. 210 sandpaper to create a raised fabric. I got it.

The obtained raised fabric was dyed using a high-pressure dyeing machine at 130'C for 1 hour using the described disperse dye and a dye having a sodium sulfonate group in its structure for 1 hour. Reduction cleaning treatment was performed at 90° C. for 20 minutes using a treatment solution containing formaldehyde (trade name Redol C) 0.2 cc/1 formic acid lcc/1 nonionic activator.

Staining was carried out using the following recipe.

Yellow 8%owf 8umikaron Yellow
BE-PRD1%owf Yellow dye with sodium sulfonate group in its structure 1g/l Nitsuka Sunsolt RM! G.

(NICCA Chemical) (PET/N7 weight ratio 4/1 PET 8 division) 0.1cc/1 Acetate Blue 8'#owf 1%owf 1g/l Sumikaron Blue 8E-Blue with sodium sulfonate group in PRD structure Dye Nikka Sunsalt RMiO (Nicca Chemical) Acetic acid 0.1 cc/L Red @*owf lowf 8urnikaron Red 8E-PRD Red dye having a sodium sulfonate group in the structure 1 g/l Nikka Sunsalt RM300 (Nicca Chemical) 0. 1 cc/1 acetic acid Prior to actual dyeing, reduction washing durability was measured.

Using the raised fabric, 0.5 g/l of ammonium sulfate was used,
A dye with a sodium sulfonate group in its structure, 1'S O
The fabric was dyed for 1 hour at °C, and the /8 value was measured at the maximum absorption wavelength of the fabric before and after dyeing, and the reduction washing durability was calculated using the formula below.

In this manner, the polyester side and nylon side were dyed with the disperse dye and the sulfone soda group dye (hereinafter referred to as anionic dye) in the same bath to dye the polyester side and the nylon side firmly. In addition, as a comparative example, a dye having a sulfonic acid group in its structure was used in combination;
RL, Blue: Nylcsan BlueNFGL
, Red: Nylosan Red 2RBL)
was used, and other treatments were prepared in exactly the same way.

The results are shown in Table 1.

jj in mizonoshita table! For the evaluation of dust whitening, the raised side of the test cloth was hand-wave dyed, 1! Using a rubbing fastness tester, load = aa
4 (H) times, 1 time using a damp cotton cloth on Jl Ruiichi at g.
i! The state of whitening was determined visually.

As shown in Table 1, the present invention has excellent sublimation fastness,
Good results with less friction whitening phenomenon can be obtained.

(The following is a blank space) (Effects of the Invention) According to the present invention, materials with completely different dyeing properties, such as polyester and polyamide, can be uniformly dyed in one bath, and the color fastness is sufficient for practical use. degree is obtained. Therefore, the uses of fabrics that have both the functions of polyester and polyamide are expanding, and their usefulness is obvious.

Claims (1)

[Claims] (1) When dyeing composite fiber structures containing polyester fibers and polyamide fibers, a disperse dye and a dye having a sodium sulfonate group in its structure and having resistance to reduction washing of 70% or more are used in combination. 1. A method for dyeing a composite fiber structure, which is characterized by dyeing in the same bath, followed by reduction washing under acidic conditions.