JPH06146109A - Highly colorable cellulose acetate yarn - Google Patents

Abstract

PURPOSE:To obtain improved cellulose acetate yarn showing colorability suitable in the field of formal use by providing cellulose acetate yarn with dark dyeability. CONSTITUTION:This functional cellulose acetate yarn is the one which comprises a cellulose acetate containing 1-30wt.% polypropylene glycol as a component wherein molecular weight and content of the polypropylene glycol satisfy the following formulas (1), (2) and (3). MW>=900...(1), 5<=CONT<=30...(2) and (MW-900)X(CONT)<=40,000...(3) wherein MW is molecular weight of polypropylene glycol and CONT is content of polypropylene glycol.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to highly colorable cellulose acetate fibers exhibiting deep dyeing property. More specifically, it relates to fibers that exhibit improved color development, especially in fields such as formal applications.

[0002]

2. Description of the Related Art Cellulose acetate fiber has the lowest refractive index among clothing fibers and has a fiber form with irregularities on the side surface of the fiber. Therefore, it is known that it has excellent color depth and sharpness. It has been demonstrated that it has excellent properties in formal applications. However, in the field of textile fibers for clothing, consumer's needs for textiles are becoming more sophisticated, and further improvement and improvement of color development are desired.

[0003]

DISCLOSURE OF THE INVENTION The present invention is intended to improve the color developability of the acetate fiber itself, and in particular, the dark dyeability of black.

[0004]

The present inventors have studied various additives as a method for improving the deep dyeing property of cellulose acetate fiber, and as a result, cellulose acetate containing a specific glycol component The inventors have found that they have achieved the object and have reached the present invention. That is, the gist of the present invention is to use polypropylene glycol 1
It is a functional cellulose acetate fiber characterized by containing a cellulose acetate content of up to 30% by weight.

The reason why the cellulose acetate fiber of the present invention has a deep dyeing property is not clear, but the addition of polypropylene glycol causes the cellulose acetate internal structure to become looser, thereby increasing the dye uptake amount and the polypropylene glycol itself. It is presumed that the deep dyeing property of the cellulose acetate fiber was improved due to the increase in dye uptake due to the dye adsorbing property being larger than that of cellulose acetate.

In the present invention, it is very important to use polypropylene glycol as an additive,
Even if polyethylene glycol is used instead of polypropylene glycol, the effect of the present invention is not exhibited. This is because polyethylene glycol has high hydrophilicity,
This is probably because polyethylene glycol is eluted during refining during dyeing. On the other hand, if polybutylene glycol is used instead of polypropylene glycol, the compatibility with cellulose acetate deteriorates and it becomes difficult to form fibers.

In the present invention, the molecular weight of polypropylene glycol to be added is preferably 900 or more, and if the molecular weight is less than 900, polypropylene glycol will be eluted during refining before dyeing even if polypropylene glycol is added. Further, when the content of polypropylene glycol is 1% or more, preferably 5% or more, the deep dyeing effect is exhibited. On the other hand, if the content exceeds 30%, the strength and morphology of the fiber deteriorate, and the fiber cannot be used practically. Further, if the content of polypropylene glycol having a large molecular weight is not reduced, the compatibility with the cellulose acetate fiber becomes poor and it becomes difficult to obtain a stable fiber.

Therefore, a functional cellulose acetate fiber whose molecular weight and content of polypropylene glycol satisfy the following formulas (1), (2) and (3) is most preferable.

MW ≧ 900 (1) 5 ≦ CONT ≦ 30 (( 2) (MW-900) × (CONT) ≦ 40000 (3) where MW is the molecular weight of polypropylene glycol CONT is the content of polypropylene glycol (% by weight)

The thus-obtained cellulose acetate fiber of the present invention has L ^* value, K / S value, and absorbance (AB580) after dissolution in a solvent represented by the following formulas (4), (5),
Satisfies (6).

L ^* value ≦ 11.4 (4) K / S value ≧ 37 (5) AB580 ≧ 0.17 ... (6)

Here, the L ^* value is the lightness measured by using a color difference meter after the cellulose acetate fiber is used as a sock knitted fabric, dyed as described in detail in the evaluation dyeing conditions described later, and the value thereof is obtained. It is considered that the lower the color, the darker the color. The K / S value is a value obtained from the spectral reflectance of the woven fabric by the Kubelka-Munk equation, and the higher the K / S value, the deeper the color. Furthermore, the absorbance (AB58
0) is the absorbance at a wavelength of 580 nm after the dyed knitted fabric is dissolved in a solvent under specific conditions described later. It is considered that the higher the absorbance is, the more dye is incorporated into the fiber.

The polypropylene glycol-containing cellulose acetate fiber of the present invention can be obtained as follows. Cellulose acetate having an acetylation degree of 48 to 62.5% is dissolved in a solvent such as acetone or methylene chloride or a mixed solvent with a poor solvent such as methanol to prepare a spinning dope having a cellulose acetate concentration of 15 to 30% by weight. The functional cellulose acetate fiber of the present invention can be obtained by dissolving polypropylene glycol in an amount of 1 to 30% by weight with respect to cellulose acetate in a stock solution for spinning and spinning the solution.

The method of adding polypropylene glycol to cellulose acetate includes a method of simultaneously dissolving with a common solvent, a method of adding polypropylene glycol or a polypropylene glycol solution to a solution of cellulose acetate, a method of mixing the respective solutions in-line, etc. Can be used. It is obtained by discharging this from a spinning nozzle into a spinning cylinder to desolvate it. At the time of spinning, it is more desirable to select spinning conditions that do not make the single fiber cross-sectional shape smooth.

The polypropylene glycol used in the present invention may be a mixture of polypropylene glycols having different molecular weights. In that case as well, the molecular weight and content of each polypropylene are represented by the above formula (1),
It is preferable to satisfy (2) and (3). Further, polypropylene glycol may have different molecular chain terminals such as diol, triol, and ester.

[Evaluation Dyeing Conditions and Dark Dyeing Property Evaluation Method] L ^* value, K / S of the cellulose acetate fiber referred to in the present invention.
The value and the absorbance after dissolution in a solvent (AB580) are the values when fibers were made into a knitted fabric by a 22 gauge circular knitting machine (flat knitting) and dyed by the method described below.

Scouring conditions: Score Roll 900 (made by Kao)
0.2 wt% aqueous solution Bath ratio 1: 100 80 ° C x 30 minutes

Dyeing conditions: Dye Dianix Black TA-N200%
(Manufactured by Mitsubishi Kasei Hoechst) 6% by weight to fiber weight Dyeing aid DISPER TL (manufactured by Meisei Chemical) 0.5 g / l URTRA MT-N2 (manufactured by Yamato Chemical) 0.5 g / l Bath ratio 1:30 130 ° C × 60 Minutes

Reductive cleaning conditions: Hydrosulfite (Kanto Chemical) 1 g / l Anhydrous sodium carbonate (Kanto Chemical) 1 g / l Meisanol BHS NEW (Meisei Chemical) 2 g / l 60 ° C. × 15 minutes

After dyeing in this way, the L ^* value is J
It is the lightness measured using a JP7100 color difference meter manufactured by UKI. The K / S value is a value obtained from the spectral reflectance of the woven fabric by the Kubelka-Munk equation. Absorbance (AB580)
Is 10 mg of dyed knitted fabric with dimethylformamide 5
It is the absorbance at a wavelength of 580 nm of the dye dissolved and dyed in 0 ml.

[0021]

EXAMPLES The present invention will be specifically described below with reference to examples. Example 1 Cellulose acetate having an average degree of acetylation of 61.3% was dissolved in a mixed solvent of methylene chloride / methanol = 91/9, and polypropylene glycol diol having a molecular weight of 2000 was dissolved in this solution with the mixed solvent described above. 20% by weight of the solution was added to the cellulose acetate solid matter to adjust the solid content concentration of the spinning solution to 23% by weight. This spinning dope was spun using a dry spinning device to obtain 75d / 20f cellulose acetate fibers. The thread properties of this fiber are shown in Table 1. The obtained fiber was dyed by the above [evaluation dyeing condition and deep dyeing property evaluation method], and the L ^* value, K / S value of the cellulose acetate fiber, and the absorbance (AB580) after dissolution in a solvent were measured. The above results are shown in Table 1.

[Examples 2, 3, 4, 5, 6, 7] The molecular weight of soluble polypropylene glycol diol and
75d / 20f in the same manner as in Example 1 except that the content of cellulose acetate was changed as shown in Table 1.
The cellulose acetate fiber of the present invention was obtained. This was dyed and evaluated in the same manner as in Example 1. The results are shown in Table 1.

Comparative Example 1 Cellulose acetate having an average acetylation degree of 61.3% was methylene chloride / methanol = 91 /
The solution was dissolved in the mixed solvent of No. 9, and the concentration of cellulose acetate in the spinning dope was adjusted to 23% by weight, and 75d / 20f of cellulose acetate fiber was obtained in the same manner as in Example 1. This product was dyed and evaluated in the same manner as in Example 1, and the results are shown in Table 1.

[0024]

[Table 1]

[Comparative Examples 2 and 3] The molecular weight of the soluble polypropylene glycol diol and the content thereof relative to cellulose acetate were changed as shown in Table 2, and Example 1 was changed.
An attempt was made to obtain a 75d / 20f cellulose acetate fiber by the same method as in (1), but spinning was difficult and the fiber could not be obtained.

[0026]

[Table 2]

As a result of preparing additive blend films under the conditions shown in Tables 1 and 2 and examining their compatibility, a whitening phenomenon was observed under the conditions of Comparative Examples 2 and 3. This proves that this blend ratio has poor compatibility and is difficult to be made into fibers.

[0028]

As described above, according to the present invention, as compared with the conventional cellulose acetate fiber, the coloring property and dyeing property of the acetate fiber itself are improved, and in particular, the deep dyeing property for black is achieved. It can be done and its value is great.

[Procedure amendment]

[Submission date] January 31, 1994

[Procedure Amendment 1]

[Document name to be amended] Statement

[Name of item to be corrected] 0025

[Correction method] Change

[Correction content]

[Comparative Examples 2 and 3] The molecular weight of the soluble polypropylene glycol diol and the content thereof relative to cellulose acetate were changed as shown in Table 2, and Example 1 was changed.
It was attempted to obtain a 75d / 20f cellulose acetate fiber by the same method as described above, but the spinning was difficult and the strength was reduced.
It was not possible to obtain large, practical fibers. Well
In addition, the obtained fiber is whitened and does not develop a coloring effect.
It was.

Claims (3)

[Claims] 1. A high-color-forming cellulose acetate fiber comprising cellulose acetate containing 1 to 30% by weight of polypropylene glycol as a constituent component. 2. The highly chromogenic cellulose acetate fiber according to claim 1, wherein the molecular weight and the content of polypropylene glycol satisfy the following formulas (1), (2) and (3): MW ≧ 900 ....・ ・ ・ ・ ・ ・ ・ ・ ・ (1) 5 ≦ CONT ≦ 30 (2) (MW-900) × (CONT) ≦ 40000 (3) where MW is the molecular weight of polypropylene glycol, and CONT is the content of polypropylene glycol (% by weight). 3. L ^* value, K of cellulose acetate fiber
/ S value, and the absorbance after dissolution in a solvent (AB580) satisfy the following formulas (4), (5), (6): L ^* value ≤ 11.4.・ ・ ・ ・ ・ ・ ・ ・ ・ ・ (4) K / S value ≧ 37 ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ (5) AB580 ≧ 0.17 ・ ・ ・・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ (6)