KR100472831B1 - Method for producing fabric of hollow rayon/rayon mixed fibers with different shrinkage - Google Patents

Abstract

According to the present invention, the cellulose acetate fibers and the rayon fibers are blended with alkali to partially saponify the cellulose acetate fibers, and then, the organic cellulose acetate portion remaining in the inner layer of the fiber is dissolved to dissolve the hollow rayon / rayon biaxial blend. A method of making a fabric is provided.

Description

Method for producing fabric of hollow rayon / rayon mixed fibers with different shrinkage}

The present invention relates to a method for producing hollow rayon / rayon biaxial interlaced fabric using a composite yarn of cellulose diacetate and rayon having a substitution degree of 2.5 to 2.75.

Rayon fiber, a representative artificial fiber of cellulose fiber, is defined as a fiber made of regenerated cellulose with no hydroxyl group substituted by more than 15% (Fiber Chemistry, Manachem Lewin Eli M. Pearce, Dekker p 914,1985). Because of Touch, it is widely used for high quality textiles. Viscose rayon (hereinafter referred to as "rayon") is prepared by making cellulose into an aqueous solution of sodium cellulose xanthate xanthate using an aqueous solution of caustic soda and carbon disulfide, and then spinning it in an aqueous solution of sulfuric acid and zinc sulfate. In this method, it is almost impossible to manufacture hollow rayon fibers due to difficulties in the manufacturing process, and thus, hollow rayon fibers have not been commercialized until now.

Therefore, an object of the present invention is to provide a method for producing a new fabric consisting of hollow rayon fibers and ordinary rayon fibers in view of the problems of the prior art as described above.

In the present inventor's research for achieving the above object, when the cellulose acetate fibers and the rayon fibers are alkali treated to saponify a part of the cellulose acetate fibers, and then dissolved in an organic solvent, the cellulose acetate fibers have hollows formed therein. In addition to being converted into, the hollow rayon obtained is very interesting in that the hollow rayon / rayon biaxial interwoven fabric having a bulky feeling, soft touch and excellent resilience, drape and light weight is obtained by showing shrinkage different from that of ordinary rayon. I learned.

Therefore, according to the present invention, the step of weaving the raw fabric with cellulose acetate fibers and rayon fibers; Alkali treating the raw material fabric to saponify 27% to 75% of the acetyl group of cellulose acetate with a hydroxyl group; A method for producing a hollow rayon / rayon biaxial blend fiber is provided, which comprises forming a hollow by dissolving a portion of cellulose acetate remaining in the cellulose acetate fiber inner layer with an organic solvent.

Hereinafter, the present invention will be described in more detail.

The present invention is composed of a rayon fiber hollow and a rayon fiber hollow is formed from a horn-seam fabric (hereinafter referred to as "raw fabric") mixed with cellulose acetate fibers and rayon fibers or mixed with other fibers. There is a need to make hollow rayon / rayon biaxial interwoven fabrics (hereinafter also referred to as “final fabrics”) in which the fibers exhibit different shrinkage properties. Here, the fabric is used to refer to the weft weave and knitted fabrics. In addition, the fibers are preferably used in combination.

According to this production method, dissolution treatment is performed by alkali treatment and organic solvent in order to obtain the final fabric from the raw fabric.

Alkali treatment of the raw fabric results in acetylation of acetyl groups from cellulose acetate in the raw fabric.

Typically, there are two known methods for deacetylating cellulose acetate, an alkali method and an acid method. Among them, saponification with alkali is characterized by saponification from the outer layer of cellulose acetate. According to the present invention, an alkali treatment is performed from the outer layer for deacetylation, and the above alkali treatment is performed to the extent that 27% to 75% of the acetyl group of the cellulose acetate is saponified with a hydroxyl group. In the process of saponification, the molecular structure of the cellulose acetate fiber changes to the cellulose molecular structure, and the crystallized molecular chains are rearranged such as folding and packing, and crystal regions increase. The structural analysis of the crystal region thus formed showed mixed crystals of cellulose II and cellulose IV crystals with specific gravity of 1.43 ~ 1.50.

Alkali treatment so that only a part of the cellulose acetate is saponified, so that saponification occurs from the surface layer portion, so that the saccharification remains inside the fiber, and as a result, the outer and inner layers of the fiber have different degrees of substitution. Cellulose acetate has different solubility characteristics of organic solvent depending on the degree of substitution of fibers.

As described above, when the cellulose acetate fibers are partially dissolved in an organic solvent, the saponified outer layer remains cellulose fibers (rayon fibers) that do not dissolve in the organic solvent as most of the acetyl groups are substituted with hydroxyl groups. The unresolved cellulose acetate portion of the fiber inner layer is dissolved and removed.

As such, when the cellulose acetate fibers are alkali treated and partially saponified and treated with an organic solvent, hollow rayon fibers are obtained. The physical properties of the hollow rayon fiber produced by the above method showed specific gravity 1.48-1.51 g / cm 3, tensile strength 1.2 ~ 2.5gf / de, elongation 20 ~ 50%, and standard moisture content 12%.

Shrinkage of cellulose acetate fiber occurs in the process of forming hollow rayon fiber from cellulose acetate by alkali-treating and dissolving the blended fiber. At this time, the shrinkage is about 14-19%, and the general rayon fiber used as the raw material fiber is 4-5. Only% shrinkage occurs. Therefore, the shrinkage difference between each other is generated, the normal cellulose fibers appear in the cellulose fibers and the effect yarns produced by saponification as a core yarn.

In the present invention, as the cellulose acetate fibers, cellulose diacetate fibers, cellulose triacetate fibers, or mixed fibers thereof can be used, and among these, cellulose diacetate fibers are particularly preferred.

In the present invention, for saponification or alkali treatment of the raw material fabric, strong alkali alone treatment or copper bath treatment or strong bath treatment method of strong alkali and weak alkali can be used.

Examples of alkali compounds that can be used in the saponification process include alkali metal hydroxides such as sodium hydroxide, alkaline earth metal hydroxides such as calcium hydroxide, alkali metal carbonates such as sodium carbonate, and the like. These alkali compounds may be used alone or in combination with a saponification promoter. As the saponification promoter, phosphonium-based saccharification accelerators and quaternary ammonium saccharification accelerators are well known. Commercially available examples of saponification promoters include NEORATE NCB, a phosphonium-based saponification promoter; KF NEORATE NA-40, a quaternary ammonium-based saponification promoter, DK-1125 [DYK-1125: one-sided product], DX- 10 yen [DXY-10N: Japan's one-sided company], Casein PES, Casein PEL, Casein Pef [Shanghai Japan's famous chemical product], Sunogen PDS: Daeyoung Chemical Co., Ltd. of Korea).

In the saponification process, alkali is made into an aqueous solution so as to be 10 to 30 wt% based on the cellulose acetate fiber as a raw material, and after immersing the fabric therein, 1 to 120 minutes at 60 ° C. or more, more preferably 60 ° C. to 130 ° C. It is appropriate to make 27 to 75% of the acetyl group of the cellulose acetate to be treated with a hydroxyl group, so that the degree of substitution of the outer and inner layers of the fiber is different.

Although not particularly limited, preferred examples of the organic solvent for dissolving and removing the cellulose acetate portion in the inner layer of the partially saponified fiber include acetone, dimethylformamide, dimethylacetamide, trifluoroacetic acid (TFA), 2 -Methoxyethanol or a mixture of two or more thereof is preferable, and the dissolution treatment time varies depending on the type of organic solvent used, but is usually 1 to 60 minutes at 20 to 130 DEG C by immersing partially saponified fibers in the organic solvent. 5 treatments are preferable.

The hollow rayon / rayon bishrink blend fabric of the present invention prepared by the method as described above is dyed with dyes for cellulose such as direct dyes, reactive dyes and bat dyes. In addition, the woven fiber fabric thus prepared has an excellent bulkiness to the cellulose-specific smoothness by the wick and effect yarn, showing excellent soft touch, rebound elasticity and drape property, and light weight and warmth due to hollow rayon.

Features and other advantages of the present invention as described above will become more apparent from the following examples. However, this invention is not limited only to a following example, It is prescribed | regulated to the claim as described separately.

In the following Examples and Comparative Examples, the weight loss ratio is measured by weight change of the sample before and after the alkali treatment, and is expressed as a percentage of the sample weight difference before and after the treatment divided by the sample weight before the treatment, and the dissolution rate is the dissolution treatment with the organic solvent. The weight change of the sample before and after is measured and the difference in the sample weight before and after the treatment is expressed as a percentage of the value divided by the sample weight before the treatment.

Example 1

Diacetate fiber 75d / 20f yarn and Viscose rayon 75d / 33f yarn with 2.55 acetyl substitution degree (55.9% superoxidation degree) were treated with an air nozzle at a pressure of 2.0kg / ㎠ 40 Cellulose diacetate / viscose rayon blend fiber was prepared by imparting entanglement of pieces / m.

The above blended yarn is used as warp and weft yarn, and the woven satin fabric (inclined density 201 / inch, weft density 88 / inch) is refined and dried, and water is added to the liquid dyeing machine and 10wt% caustic soda is added to the diacetate. It was. The refined and dried diacetate fibers were placed in a liquid dyeing machine, and then heated at a heating rate of 2 ° C./min at 30 ° C., treated at 98 ° C. for 30 minutes, cooled to 30 ° C. at a cooling rate of 2 ° C./min, and drained. . Water was added at room temperature and washed with water to remove residual alkali, and the fibers were taken out and dried. Through this saponification process, a partially saponified fiber having a loss ratio of 11.3% relative to the initial diacetate fiber weight was obtained.

The fiber was placed in a liquid dyeing machine, 2-methoxyethanol (manufactured by Altrici Co., Ltd.) was added, treated at room temperature for 30 minutes, followed by draining three times. Then dried. Through this dissolution treatment process, a hollow fiber having a dissolution rate of 76.5% was obtained. Infrared spectroscopy of the obtained hollow fiber using an infrared spectrometer (MAGNA 750, Nicolet, USA) revealed that the peak around 1740 cm ^-1 representing carbonyl disappeared to form cellulose.

The hollow rayon fiber obtained after the above-mentioned alkali reduction and dissolution treatment had a shrinkage of 9.48% and a rayon fiber of 4.24% (shrinkage difference difference 5.24%).

[Examples 2 to 5]

Except for changing the amount of caustic soda as shown in Table 1, the same procedure as in Example 1 was repeated to prepare a hollow rayon / rayon biaxial blend fiber. The loss, dissolution and shrinkage rates for each example are shown in Table 1.

division Example 1 Example 2 Example 3 Example 4 Example 5 NaOH consumption (% by weight) 10 15 20 25 30 Reduction rate (%) 11.3 14.5 19.5 25.0 30.1 Dissolution rate (%) 76.6 62.5 44.1 29.6 15.4 Shrinkage (%) Hollow rayon fiber 9.48 11.24 12.56 13.15 14.9 Viscose rayon fiber 4.24 4.31 4.21 4.33 4.22 Shrinkage difference 5.24 6.93 8.35 8.82 10.68

Comparative Example 1

Satin fabric with warp yarn and weft yarn 120d / 33f of viscose rayon (Asahi, Japan), and 210mm / inch of warp yarn density and 91ol / inch of warp yarn density was added after adding 1g / L of soda ash and 1g / L of refiner. It refine | purified at 10 degreeC for 10 minutes.

The fabrics according to Examples 1 to 5 and the fabrics of Comparative Example 1 were compared and evaluated for softness, drape, resilience and component properties, and the results are summarized in Table 2. In Table 2, evaluation grade x is bad, (triangle | delta) is normal, (circle) is good, and (◎) is very good, respectively.

division Comparative Example 1 Example 1 Example 2 Example 3 Example 4 Example 5 Softness ○ ○ ◎ ◎ ◎ ◎ Drape Castle ○ ○ ○ ◎ ◎ ◎ Resilience ○ ○ ○ ◎ ◎ ◎ Parts △ ○ ○ ○ ○ ○

When comparing the fabric properties as shown in the table above, the fabric produced by the present invention was superior in part, softness and resilience compared to the fabric of the general viscose rayon.

As will be apparent from the above experimental results, the hollow rayon / rayon biaxial interwoven fabric prepared from cellulose acetate / rayon interwoven fabric according to the present invention is lighter than conventional rayon fabrics and has excellent parts, softness, drape and resilience. It is a novel useful fabric having.

Claims (4)

Weaving the raw fabric with cellulose acetate fibers and rayon fibers; Alkali treating the raw material fabric to saponify 27% to 75% of the acetyl group of cellulose acetate with a hydroxyl group; A method of producing a hollow rayon / rayon biaxial interwoven fabric, comprising dissolving the remaining unmethylated cellulose acetate portion of a cellulose acetate fiber layer with an organic solvent to form a hollow. The method of claim 1, wherein the cellulose acetate fibers are cellulose diacetate fibers having a degree of substitution of 2.0 to 2.75. The method for producing a hollow rayon / rayon biaxial interwoven fabric according to claim 1, wherein the alkali treatment is a strong alkali treatment or a copper bath treatment or strong bath treatment of a strong alkali and a weak alkali. The method for producing a hollow rayon / rayon biaxial interwoven fabric according to claim 2, wherein an alkali and a saponification promoter are used in combination with the alkali treatment.