KR20030032425A - Method of producing fiber used rayon/nylon mixed yarn - Google Patents

Abstract

PURPOSE: Provided is a manufacturing method of fabric made of rayon/nylon different shrinkage blended yarn to generate a difference of shrinkage percentage between nylon fiber and cellulose fiber for converting cellulose diacetate fiber into the cellulose fiber. The fabric has excellent voluminous feeling, drapability, bulkiness and moisture absorbing property. CONSTITUTION: The fabric made of the rayon/nylon different shrinkage blended yarn is obtained by the steps of: preparing nylon6 and nylon66 as effect yarns and the cellulose diacetate fiber having 2.0-2.75 of substitution as a core yarn; manufacturing different shrinkage blended yarn using the core yarn and the effect yarns; tension-heating the blended yarn; weaving the fabric using the yarn; and then saponifying the fabric with alkali at 70-130deg.C for 1-120 minutes to convert the cellulose acetate yarn into the rayon. After saponifying, the effect yarn and the core yarn satisfy a formula(1): 4<=SSP(H)-SSP(L)<=10. In the formula I, SSP(H) is a shrinkage percentage(%) of the core yarn in the saponifying step; and SSP(L) is a shrinkage percentage(%) of the effect yarn in the saponifying step.

Description

Method for producing fabric using rayon / nylon biaxial blend fiber {Method of producing fiber used rayon / nylon mixed yarn}

The present invention is made of nylon 6 and nylon 6.6 as an effect yarn, the cellulose diacetate fiber of degree of substitution 2.0 ~ 2.75 as a screening, fluid entanglement treatment and tension heat treatment to produce a bi-shrink blend yarn, weaving the fabric woven with the yarn It relates to a method of producing rayon fibers by alkali treatment,

By using the shrinkage rate generated in the rayonization process of cellulose diacetate fibers and the bishrinkage property of nylon, it has excellent physical properties such as volume, drape, bulkiness, soft touch, and natural appearance in the fabric state, and has excellent hygroscopicity. A rayon / nylon bishrink blend fiber.

Nylon fibers are typical of polyamide fibers having repeating units of amide groups in the backbone of the polymer and have an elongation of 30 to 50% with no difference in wet and dry. In addition, the elastic modulus of 120 ~ 500kg / mm ² is low compared to the other synthetic fibers and flexible, good fiber to show the curvature of the human body, but due to low hygroscopicity is not good antistatic properties, causing problems such as static electricity.

Although rayon has high specific gravity, it has excellent weight and rebound elasticity, but its strength is weak, so it is limited in its development. However, rayon can be supplemented by compounding with high strength synthetic fiber such as nylon. In addition, nylon can be endowed with dimensional stability and shape retention through heat-setting process that heat-treat at high temperature, so it can compensate for morphological stability which is the biggest disadvantage of rayon, and rayon has good hygroscopicity and antistatic property. It can solve such problems.

Conventional rayon / nylon bishrink blended yarn has a problem that the touch ratio and drape are not good because the shrinkage effect is reduced as the shrinkage is 0 to 5% of rayon and 9 to 10% of nylon fiber.

Accordingly, the present invention provides a novel method for producing a rayon / nylon biaxial blend fiber having excellent hygroscopicity, having excellent volume, drape, bulkiness, soft touch, and natural appearance without the problems of the prior art as described above. The purpose.

According to the present invention which achieves the above object, a process of tension heat treatment of a biaxially blended blended fiber having nylon 6 and nylon 6.6 fibers as an effect yarn, and a cellulose diacetate fiber having a degree of substitution of 2.0 to 2.75, as a tensioned blended yarn. A process of weaving the fabric, and a process of converting the cellulose diacetate fibers into rayon fibers by alkali treating the woven fabric, and after the saponification, the effect yarn (low shrink yarn) and the screening (high shrink yarn) satisfy the following equation (1). Provided is a method for producing a rayon / nylon bishrink blend fiber.

4≤SSP (H) -SSP (L) ≤10

SSP (H) is the shrinkage rate of high shrinkage yarn in the saponification process after stress heat treatment (%)

SSP (L) is the shrinkage percentage of low shrinkage yarn in the saponification process after stress heat treatment (%)

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

The present invention is characterized in that it comprises a process of weaving biaxially blended mixed yarns by air entanglement using nylon 6 and nylon 6.6 fibers as effect yarns, and cellulose diacetate fibers having a degree of substitution of 2.0 to 2.75.

The effect yarns are preferably nylon 6 and nylon 6.6 fibers, and the screening is preferably a cellulose diacetate having a degree of substitution of 2.0 to 2.75, because the volume, drape and bee to be achieved in the present invention within this range. This is because it can provide rayon / nylon bishrink blended fabric with high hygroscopicity, soft touch and natural appearance.

In addition, the present invention is characterized in that it comprises a step of tension-heat treatment of the bi-shrink blended yarn, weaving the fabric into the tension-treated blended yarn.

In addition, the present invention is characterized in that it comprises a step of converting the cellulose diacetate fibers into rayon fibers by alkali treatment of the fabric woven with rayon / nylon biaxial horn fiber.

In the present invention, the effect yarn and the screening satisfies Equation 1 after the alkalizing (safflower), which is mixed with the low-shrink nylon 6 and nylon 6.6 and the high-shrinkage cellulose diacetate yarn, which is the effect yarn, and the saponification process after tension heat treatment. It means that the shrinkage (%) difference between the high shrinkage yarn and the low shrinkage yarn occurring at is less than 4 and less than 10, which is desirable. If the shrinkage ratio is less than 4, the shrinkage difference is small, so that it is impossible to have volume, drape, bulkiness, etc. . For example, when the nylon fiber is 9 to 10% and the shrinkage of the cellulose diacetate is 13 to 20%, the biaxially blended fiber in the above range becomes.

In addition, the present invention is characterized in that it comprises a step of converting the cellulose diacetate fibers into rayon fibers by alkali treatment of the fabric woven using the blended yarn, 30 to 40wt% alkali aqueous solution to the cellulose diacetate fibers After preparing, and immersing the fabric in the prepared aqueous solution, it is suitable to convert the cellulose diacetate fiber to rayon fiber by treating it once or twice for 1 to 120 minutes at 70 ^o C or more and 130 ^o C or less. Since nylon fibers have excellent alkali resistance under alkaline treatment conditions, it is possible to obtain a rayon / nylon biaxial blend fiber having the desired shrinkage difference in the present invention without damaging the fibers.

Alkali treatment of cellulose diacetate results in saponification in which acetyl groups are converted to hydroxy groups. Crystallization occurs due to rearrangement of folding and packing of molecular chains of diacetate fibers that were amorphous. In general, natural cellulose has a crystalline structure of cellulose I. In the case of regenerated cellulose fibers, cellulose II has a structure of cellulose, whereas cellulose fibers prepared by saponification of cellulose diacetate have a crystal structure of cellulose II and VI. Crystallinity (specific gravity method) 14-34%, birefringence 0.012 ~ 0.024.

The cellulose fiber obtained by saponification of a cellulose diacetate fiber is also a kind of rayon fiber. The physical properties of these cellulose fibers are 1.48 ~ 1.51gm / cm ³ , tensile strength 1.2 ~ 2.5gf / de, elongation 20 ~ 50%, standard moisture content 12 ~ 13%.

In the present invention, for saponification or alkali treatment, 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, and alkali metal carbonates such as sodium carbonate. 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 accelerators include phosphonium-based neorate NCB (Korea Precision Products); KF NEORATE NA-40 (KF NEORATE NA-40: Korea Precision Products), DYK-1125 [Japan's one-sided yarn], Casein PES, Car And serine PEL, casein PEF (above Japan's prestigious chemical product), and SNOGEN PDS (Korean Daeyoung Chemical).

Features and other advantages of the present invention as described above will become more apparent from the following examples. However, the present invention is not limited to the following examples.

In the following examples, the reduction ratio is expressed as a percentage of a value obtained by dividing the weight difference of the sample before and after the alkali treatment by dividing the sample weight difference before and after the treatment by the sample weight before the treatment.

Example 1

Cellulose diacetate fiber (SK Chemicals) 75d / 20f yarn and nylon filament fiber (Hyosung) 70d / 24f yarn with acetyl substitution degree 2.0 ~ 2.75 through 2.0kg / cm ² through air nozzle Treatment with pressure imparted a entanglement of 40 / m to prepare cellulose diacetate / nylon blend yarns.

Tension heat treatment of the above blended yarn at 80 ℃ for 30 minutes, and then weaved satin (weaved yarn 21 yarns / inch, weft density 88 yarns / inch) using the warp and weft yarn into the liquid dyeing machine. in the diacetate prepared in the caustic soda and the saponification promoter 1g / L of 32wt% and 30 ^o C to 2 ^o C / to min temperature was raised at a heating rate 100 ^o then at C for 30 minutes 30 ^o C 2 ^o C / min Cooled at a cooling rate, drained, washed with water and reduced.

Through the saponification process, a loss ratio of 34% of the initial acetate fiber weight and a loss ratio of the initial nylon weight of 0% were obtained.

In addition, to determine the loss ratio of each of the two fibers, the cellulose diacetate fibers and the nylon fibers were mixed in a liquid flowr without mixing and measured in the same manner as described above.

Table 1 shows the shrinkage ratios of the used yarns and their shrinkage differences.

In addition, the physical properties of the softness, drape, resilience, and parts properties of the woven fabric described above are shown in Table 1 as a grade.

The defects were represented by X, usually Δ, good in the case of O, and very good in the case of?

In addition, the carbonyl peak of the acetyl group was found at 1760 cm ^-1 as a result of the infrared spectral spectrum analysis of the initial cellulose diacetate yarn, and the infrared spectroscopic analysis of the rayon fiber prepared in Example 1 was carried out at 1760 cm ^-1 . As the bonyl peak disappeared, it was found that complete rayon fibers were produced.

Example 2

The same procedure as in Example 1 was repeated except that the amount of caustic soda was 36 wt%. Acetate loss was 37%.

The shrinkage of the yarn used and the other physical properties of the fabric are shown in Table 1.

Example 3

The same procedure as in Example 1 was repeated except that the amount of caustic soda was 40 wt%. Acetate loss rate was 40%.

The shrinkage of the yarn used and the other physical properties of the fabric are shown in Table 1.

Comparative Example 1

Viscose Rayon (Asahi, Japan) 75d / 20f yarn and nylon (Hyosung) 75d / 24f yarn are treated with 2.0kg / cm ² pressure through air nozzle to give 40 / m entanglement. Rayon / nylon blend yarn was prepared.

Tension heat treatment of the above blended yarn at 80 ^o C for 30 minutes, and then weaved satin fabric (slant density 21 yarns / inch, weft density 88 yarns / inch) using 1 g / L of soda ash And 0.5 g / L of refinery were added and refined at 100 ^° C. for 30 minutes.

Table 1 shows the results of measuring the shrinkage of the yarn and other physical properties of the fabric.

division Example 1 Example 2 Example 3 Comparative Example 1 Shrinkage (%) Cellulose yarn 13 17 20 6 Polyester yarn 9 9.5 10 9 Shrinkage difference 4 7.5 10 3 Softness O ◎ ◎ O Drape Castle O ◎ ◎ △ Resilience O ◎ ◎ O Parts O ◎ ◎ X

As shown in the above table, in the comparative example, the shrinkage difference between the rayon fibers and the nylon fibers is low, and there is no improvement effect of the softness and drape, which is a result of the bishrinkage effect. On the other hand, in the case of the embodiment, the shrinkage of the cellulose acetate fiber is generated through the rayonization process, resulting in the bishrink intermixing effect due to the difference in shrinkage ratio, thereby exhibiting excellent volume, drape, and feel.

As will be apparent from the above experimental results, the rayon / nylon blend fabric prepared by the present invention is a fabric composed of conventional rayon / nylon fibers due to the difference in shrinkage ratio between nylon fibers and cellulose fibers as cellulose diacetate fibers are converted into cellulose fibers. Compared to the excellent volume, drape, bulky and hygroscopicity.

Claims (5)

Process of tension heat treatment of biaxially blended blended yarn with nylon 6 and nylon 6.6 fibers as effect yarns and cellulose diacetate fibers with substitution degree of 2.0 ~ 2.75, weaving fabric with tension heat-treated blended yarn, woven fabric A process for producing a rayon / polyester blend fabric comprising an alkali treatment to rayon the cellulose diacetate yarn. The method for producing a rayon / polyester blend fiber of claim 1, wherein an effect yarn (low shrink yarn) and a screening (high shrink yarn) satisfy the following formula (1) after the alkali treatment. [Equation 1] 4≤SSP (H) -SSP (L) ≤10 SSP (H) is the shrinkage rate of high shrinkage yarn in the saponification process after stress heat treatment (%) SSP (L) is the shrinkage percentage of low shrinkage yarn in the saponification process after stress heat treatment (%) The method according to claim 1, wherein the alkali treatment temperature is 70 ~ 130 ^° C., the alkali treatment time is 1 ~ 120 minutes, and the alkali concentration is treated with 30 ~ 40wt% compared to cellulose acetate yarns. Process for the preparation of polyester biaxial interwoven fabric. The method for producing a rayon / polyester biaxial interwoven fabric according to claim 1, wherein the alkali is a strong alkali treatment or a copper bath or strong bath treatment of a strong alkali and a weak alkali. 2. The method for producing a rayon / polyester biaxial interwoven fabric according to claim 1, wherein an alkali and a saponification promoter are used in combination with the alkali treatment.