JP2932310B2 - Cellulose acetate fiber - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to a cellulose acetate fiber for ultrafine clothing having a soft feel and a deep dyeing property.

[Conventional technology]

In recent years, in the field of textiles for clothing, fashion and consumer needs have been diversified and upgraded, and in order to respond to this, the appearance, shape, cross section, and substrate of the fibers themselves have been improved or modified. ing. In particular, various methods have been proposed as means for making a single fiber extremely thin, which greatly contributes to the improvement of the feeling.

For example, with respect to polyester fibers, ultrafine yarns have been produced by making use of advanced composite spinning techniques such as splittable multilayer type and sea-island type.

[Problems to be solved by the invention]

However, with regard to cellulose acetate fibers obtained by dry spinning, it has been extremely difficult to produce ultrafine yarns. In other words, since there is almost no draft from spinning to winding, and since the drawing operation cannot be performed in the subsequent process, a nozzle having a pore size not found in other synthetic fibers of several tens of microns is inevitably required to obtain an ultrafine yarn. Although it is necessary to use it, the single fiber fineness is limited to 1.5 to 2.0 denier, and cellulose acetate fibers having a very soft feeling have not yet been obtained.

[Means for solving the problem]

The present invention relates to a cellulose acetate fiber for deep-dyeing extra-fine clothing having a soft feel obtained by eluting polyethylene glycol from a cellulose acetate fiber containing 5 to 50% by weight of polyethylene glycol shaped by dry spinning with a solvent and ultrafine. It is in.

Cellulose acetate fiber containing polyethylene glycol shaped by dry spinning contains 5 to 50% by weight of polyethylene glycol in the fiber. If it is added in excess of 50% by weight, the polyethylene glycol swells without being completely dissolved in the spinning solvent, and the spinning stability becomes extremely poor. If the amount is less than 5% by weight, it is insufficient to obtain the fineness, soft feeling and deep dyeing effect due to the dissolution of polyethylene glycol.

As a method of adding polyethylene glycol to cellulose acetate, a method of simultaneously dissolving polyethylene glycol and cellulose acetate, a method of mixing the respective dissolved solutions, a method of adding polyethylene glycol to a cellulose acetate solvent solution, and the like are used. Can be In addition, when spinning the spinning solution, spinning method is particularly limited, such as spinning a uniform mixed spinning solution, spinning solution containing polyethylene glycol and spinning solution without polyethylene glycol into side-by-side or sea-core, etc. Instead, the dry-spun cellulose acetate fiber may contain 5 to 50% by weight of polyethylene glycol.

The cellulose acetate fiber for deep-dyeing ultrafine clothing of the present invention is polyethylene glycol contained in the fiber by subjecting the polyethylene glycol-containing cellulose acetate fiber to a polyethylene glycol-soluble and cellulose acetate-insoluble solvent, for example, elution with water. Most of them are eluted.

The dissolution treatment of polyethylene glycol may be performed at any stage after fiber shaping, such as a yarn stage, a stage of forming a fabric such as a woven fabric or a knitted fabric, and the dissolution treatment may be performed in a water bath at 80 to 100 ° C for 20 to 60. It is preferred that the polyethylene glycol is eluted with water contained in a scouring bath during scouring after fabric formation.

In this elution treatment, only polyethylene glycol is eluted from a state where cellulose acetate and polyethylene glycol are mixed at the molecular level. Due to the elution of the polyethylene glycol, volume shrinkage of the fiber occurs to make the fiber finer, and the cellulose acetate fiber becomes an ultrafine cellulose acetate fiber having a fineness less than a single fiber fineness obtained by ordinary dry spinning.

Furthermore, the fibers with the elution of polyethylene glycol also have a porous structure at the micro level, which not only promotes a soft feeling of the hand, but also has extremely high apparent dyeability due to promotion of internal diffusion of the dye. It can exhibit dyeing properties.

〔Example〕

 Hereinafter, the present invention will be described specifically with reference to examples.

Example A cellulose acetate having an average acetylation degree of 61.3% was dissolved in a mixed solvent of methylene chloride / methanol = 91/9,
A solution prepared by dissolving molecular weights of 400 and 1,000 and polyethylene glycol in the same mixed solvent as described above was added so as to be 50% by weight in terms of a solid content of cellulose acetate, and mixed and stirred to obtain a spinning stock solution having a cellulose acetate concentration of 23.0% by weight. . These spinning stock solutions were each dried with a dry spinning apparatus to a pore size of 28.
Spinning was performed with the aim of obtaining 75d / 50f yarn from a spinning nozzle having μ and 50 holes, and yarns of 74.6d / 50f and 73.3d / 50f were obtained, respectively.

The obtained yarn was sampled, and a 0.2% by weight aqueous solution of Score Roll 900 (a scouring agent manufactured by Kao Corporation) was used at 95 ° C at a bath ratio of 1: 100.
After scouring for 30 minutes and air drying, the fineness was measured. As a result, ultrafine cellulose acetate yarns of 54.6 d / 50f and 50.8 d / 50f were obtained.

Comparative Example Cellulose acetate having an average acetylation degree of 61.3% was dissolved in a mixed solvent of methylene chloride / methanol = 91/9, and the concentration was 21.9.
The spinning stock solution adjusted to 5% by weight was spun from a spinning nozzle having a pore diameter of 28 μ and a number of holes of 50 with a dry spinning apparatus in the same manner as in the Example, and
4.1d / 50f yarn was obtained.

Next, scouring was performed in the same manner as in the example, but the fineness was hardly changed due to the scouring, and the ultrafineness could not be achieved.

Table 1 shows the measurement results of the single fiber fineness obtained by dividing the total filament fineness (d) of the example and the comparative example by the number of filaments (f), the yarn physical properties, the feeling evaluation by the knitted fabric, and the amount of dyeing.

[Effects of the Invention] As described above, according to the present invention, compared to conventional cellulose acetate fibers, a single fiber fineness exhibiting a soft texture and deep dyeability is about 1.0d, and a special spinning nozzle is used for a special spinning nozzle. It can be provided without using it, and its value is extremely large.

──────────────────────────────────────────────────続 き Continued on front page (58) Field surveyed (Int.Cl. ⁶ , DB name) D01F 2/28-2/30 D06M 11/00-11/84

Claims (1)

(57) [Claims] 1. A cellulose acetate for a deep-dyeing ultrafine garment having a soft feel obtained by eluting polyethylene glycol from a cellulose acetate fiber containing 5 to 50% by weight of polyethylene glycol shaped by dry spinning with a solvent and ultrafine. fiber.