JP2006037308A - Core-sheath acetate fiber and woven or knitted fabric of the same - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a cationic dye-dyeable acetate fiber capable of preventing an additive from being dissolved, in a use for being formed into a combined fabric together with a general-purpose polyester fiber requiring wet heat treatment, and capable of developing a dyed color which is resistant to the wet heat treatment, namely, having cationic dye-dyeing characteristics and a dyed color density practically satisfactory, even when subjected to a manufacturing processes in which the wet heat treatment is adopted, and to provide a woven or knitted fabric of the same. <P>SOLUTION: This core-sheath acetate fiber is composed of a core component of which the acetate contains a sulfonate group-containing surfactant and a sheath component which comprises triacetate. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a core-sheath acetate fiber having a dyeable dye property and a woven or knitted fabric thereof.

  Conventionally, the dyeing characteristics of cellulosic fibers are difficult to modify and improve because natural cellulose is used as a raw material. In the past, attempts have been made to introduce ionic reactive groups into cellulose, but this is accompanied by a reduction in molecular weight. There was a problem with the mechanical characteristics.

  For this reason, a compound that binds to an ionic dye as an auxiliary agent is added to the dyeing bath to form a complex, which is then fixed to the fiber. Several techniques have been disclosed, such as adding an anionic or cationic dye dyeability by adding a compound that binds to a dye.

  In addition, cellulose acetate fiber has excellent color developability and silk-like glossiness and dryness not found in synthetic fibers such as polyester fiber and polyamide fiber, and is widely used in the field of women's clothing. Quality and improvements are being made.

As a dyeing technique for acetate fibers, a method of adding a dyeing agent to the latter spinning dope is preferable. For example, Patent Document 1 includes a metal sulfonate group as an additive that becomes dyeable to a cationic dye. Dibasic fatty acid esters are disclosed.
JP 2000-45123 A

  However, in this method, the additive tends to be eluted from the fiber by wet heat treatment, and in applications where it is mixed with general-purpose polyester fiber that requires wet heat treatment at 100 to 130 ° C., the treatment depends on the state of the fabric in the treatment liquid. When spots occur, they cause dyeing spots as they are, and there is a problem that dyeing characteristics that are practically satisfactory cannot be obtained, such as greatly deteriorating the quality of the resulting woven or knitted fabric.

  The present invention solves such problems in the prior art, has a dyeing expression that is resistant to wet heat treatment, that is, has a dyeing property that is practically satisfactory even when processing steps employing wet heat treatment are performed. And a dye dyeable acetate fiber having a dyeing density and a woven or knitted fabric thereof.

  The first gist of the present invention resides in a core-sheath acetate fiber in which a sulfonate group-containing surfactant is contained in the core component acetate and the sheath component is triacetate.

  Moreover, the 2nd summary of this invention exists in the woven / knitted fabric containing the core sheath acetate fiber of this invention.

  In the present invention, a sulfonate group-containing surfactant is contained in the core component acetate, and triacetate is used as the sheath component, thereby imparting cationic dye dyeability due to the sulfonate group to the acetate fiber.

  The sheath component must be triacetate. Triacetate means that the degree of esterification is 92% or more. A diacetate having a degree of esterification of less than 92% as the sheath component has a high affinity for water and cannot exhibit the elution resistance characteristics of the sulfonate group-containing surfactant.

  In addition, the core-sheath acetate fiber of the present invention is a sulfonate group-containing surfactant in which the elution amount of the additive from the core-sheath acetate fiber is less than 40% of the addition amount in a wet heat treatment at 130 to 135 ° C. for 30 minutes. It is preferable to contain. The amount of the sulfonate group-containing surfactant present in the fiber affects the cation dyeability. However, the sulfonate group-containing surfactant is uniformly dispersed in the core component present in the center of the fiber. It is considered that the active agent is eluted from the one close to the fiber surface by heat treatment.

  For this reason, the sulfonate group-containing surfactant is eluted from the cationic dye-dyeable cellulosic fiber in excess of 40% of the addition amount in a wet heat treatment at 130 to 135 ° C. for 30 minutes, which is the treatment condition of the polyester fabric. In some cases, as in the case of conventional fibers that do not have a core-sheath structure, if the treatment spots occur due to the state of the fabric in the wet heat treatment liquid, it will cause dyeing spots as it is, and the quality of the resulting woven or knitted fabric will be greatly impaired. It is difficult to obtain satisfactory dyeing properties, and in the case of a mixed material of cationic dye-dyeable acetate fiber and cationic dye-dyeable polyester, the dyeing speed is increased by elution of the dye of the cationic dye-dyeable acetate fiber. Is slow, and most of the dye is colored on the cationic dyeable polyester fiber, so the cationic dyeable polyester fiber is very dark. Stained, problems are likely to occur in the dyeing shading difference that one cationic dye dyeable acetate fiber is not dyed at very light color.

  Moreover, it is preferable that content of the sulfonate group containing surfactant in a core component is 4-15 wt% as the whole fiber. In order to strongly express the coloring by the cationic dye, it is preferable to include more, but if it exceeds 15 wt%, the amount of the core component added to the spinning dope increases, so that the uniform mixing property and spinning stability become poor, and The fiber physical properties such as degree are also likely to deteriorate. The content of only the core component is preferably 35% or less. On the other hand, if the amount is less than 4 wt%, the dyeing density with the cationic dye is insufficient even if the elution amount is less than 40%, and it is difficult to obtain the dyeing effect.

  The composite weight ratio of the sheath component and the core component is preferably 2: 1 to 5: 1. If it is less than 2: 1, it is difficult to form a stable core-sheath cross-sectional structure, and it is difficult to make the dissolution resistance 40% or less, and if it is 5: 1 or more, the sulfonate group-containing surfactant is a fiber. It is difficult to disperse in, and sufficient dyeability cannot be obtained.

  In addition, as a preferable sulfonate group-containing surfactant in the present invention, sodium sulfosuccinic acid dialkyl ester is preferable, and sodium dioctyl sulfosuccinate and sodium dihexyl sulfosuccinate are excellent in light fastness after dyeing with a cationic dye.

The core component acetate of the present invention is not particularly limited, and may be diacetate or triacetate.
Next, an example of the manufacturing method of the core sheath acetate fiber of this invention is demonstrated.

  In the spinning dope used for spinning, cellulose acetate is dissolved in a single solvent such as methylene chloride or a mixed solvent such as methylene chloride / methanol to give a cellulose acetate concentration of 15 to 35 wt%, preferably 18 to 30 wt%. In addition to the core component, a sulfonate group-containing surfactant is added to the stock solution and mixed, or a solution in which the sulfonate group-containing surfactant is dissolved in a single solvent such as methylene chloride or methanol or a mixed solvent such as methylene chloride / methanol. Is added to the stock solution and mixed to adjust the sulfonate group-containing surfactant to a predetermined concentration.

  In this case, the amount of the sulfonate group-containing surfactant added to the core component is adjusted to 8 to 35 wt%, preferably 15 to 30 wt%, based on the total solid content of the core component stock solution.

  Spinning is preferably performed by a dry spinning method in which a core-sheath both-spinning undiluted solution is supplied to a known core-sheath type composite spinning apparatus and discharged from a spinning nozzle into a high-temperature atmosphere, but the non-solvent coagulation of cellulose acetate from the spinning nozzle. You may carry out by the wet spinning method discharged in. Further, the cross-sectional shape of the fiber may be either circular or irregular, and the fiber form may be either staple or filament.

  In addition, the woven or knitted fabric made of the core-sheath acetate fiber of the present invention is preferably arranged in the woven or knitted fabric so that the coloring of the fiber can be sufficiently visually confirmed, and an array application such as a stripe or an embroidery thread is suitable. In addition, it can also be used as a composite yarn such as a covering yarn in which the fiber is arranged outside the fiber bundle, a turbulent flow processed yarn arranged in a loop shape, a loop yarn, a morse yarn, etc. The fiber content is preferably 5% or more. If it is less than 5%, even if it is dyed in a dark color, the expression of different colors or light and dark colors tends to be insufficient as a woven or knitted fabric.

Hereinafter, the present invention will be described with reference to examples. Evaluation was performed by the following method.

(staining)
Cationic dye-dyeable fibers are charged into a dye bath (sealed pressure vessel) with a bath ratio = 1: 40, and dyed with stirring at a temperature = 120 ° C. for a time = 30 minutes.

Preparation of dyeing bath Cationic dye: 1% owf (Cathiron Blue CD-FBLH manufactured by Hodogaya Chemical Co., Ltd.)
Auxiliary agent: 0.5 g / L (Ultra MT N2 manufactured by Daiwa Chemical Industry Co., Ltd.)

Cellulose triacetate in which 97% of the hydroxyl groups are acetic acid was dissolved in a mixed solvent of methylene chloride / methanol (mixing ratio 91/9) to prepare a spinning stock solution of sheath component having a concentration of 21.9 wt%. Furthermore, as a sulfonate group-containing surfactant, sodium dioctyl sulfosuccinate (manufactured by Toho Chemical Co., Ltd.) was added to the core component so that the total solid content was 27.5 wt%, and the sheath component was spun. A spinning stock solution of the core component was prepared by stirring and mixing with the stock solution. Using these spinning stock solutions, using a known core-sheath type composite spinning machine, dry spinning was performed so that the composite weight ratio of the sheath component to the core component was 4: 1, and winding was performed at a spinning speed of 500 m / min. A 20-filament core-sheath acetate fiber was obtained.

  The obtained fiber and a cationic dye dyeable polyester fiber 56 dtex / 24f copolymerized with 5-sodium sulfoisophthalic acid were interlaced, knitted after steam set at 1200 t / m and steam set at 80 ° C. for 40 minutes. (28G smooth). This was subjected to relaxing moist heat treatment at 130 ° C. for 30 minutes and then subjected to cationic staining at 120 ° C. The obtained product was able to obtain a product of uniform color.

(Comparative Example 1)
As a sulfonate group-containing surfactant, 84 decitex / 20 filament cellulose triacetate fibers were obtained under the same conditions as in Example 1 except that sodium dioctylsulfosuccinate was not added to the core component.

  The obtained fiber was not dyed with respect to the cationic dye.

(Comparative Example 2)
An 84 dtex / 20 filament core-sheath acetate fiber was obtained under the same conditions as in Example 1 except that diacetate having an esterification degree of 80% was used as the sheath component.

  The obtained fiber and a cationic dye dyeable polyester fiber 56 dtex / 24f copolymerized with 5-sodium sulfoisophthalic acid were interlaced, knitted after steam set at 1200 t / m and steam set at 80 ° C. for 40 minutes. (28G smooth). This was subjected to relaxing moist heat treatment at 130 ° C. for 30 minutes and then subjected to cationic staining at 120 ° C. The resulting product was dyed with a cationic dye-dyeable polyester fiber, but the core-sheath acetate fiber was not dyed and became a product that was mixed with a sensation because the sulfonate group-containing surfactant was eluted. .

Claims (3)

  A core-sheath acetate fiber containing a sulfonate group-containing surfactant in the core component acetate and the sheath component being triacetate.   The core-sheath acetate fiber according to claim 1, wherein the sulfonate group-containing surfactant is sodium sulfosuccinic acid dialkyl ester.     A woven or knitted fabric comprising the core-sheath acetate fiber according to claim 1 or 2.