JPH08158250A - Production of surface-modified fiber - Google Patents

Abstract

PURPOSE: To produce a surface-modified fiber by treating a mixed spun fiber with water, thereby dissolving and removing at least a part of one of constituent polymers of the fiber. CONSTITUTION: A composition composed of 90-99 pts.wt. of a thermoplastic polymer A having excellent fiber-forming property and 10-1 pt.wt. of a water-soluble or water-dispersible thermoplastic water-absorbing polymer B occupies at least a part of the surface of a melt-spun fiber to be used as a raw material in this production process. The spun yarn is taken up after the application of a non-aqueous oil and wound at a high speed or drawn and wound. The obtained fiber is treated with water to dissolve and remove at least a part of the polymer B.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for producing a surface-modified fiber which has fine pore lines on the fiber surface and is suitable as a fiber for clothing.

[0002]

2. Description of the Related Art Conventionally, various methods for producing surface-modified fibers having fine pores on the fiber surface have been proposed. For example, a method has been proposed in which polyester fibers mixed with inorganic fine particles such as silica are subjected to weight reduction processing with an alkaline aqueous solution (JP-A-55-107512). However, in this method, when producing a polyester fiber containing inorganic fine particles,
There is a problem that guides, rollers and the like are easily worn by the inorganic fine particles near the fiber surface.

Further, a method has been proposed in which a mixed spun fiber composed of two kinds of polymers having different solubilities in a solvent is treated with a solvent to elute and remove at least a part of one polymer (Japanese Patent Publication No. 44). -6142, 44-21805, etc.). However, in this method, it is necessary to use a special solvent, and there is a problem that a large amount of cost is required for waste liquid treatment, or the like, when using polyester as one of the polymers and eluting and removing with an alkaline aqueous solution, There is a problem that it takes a long time to elute and remove with an alkaline aqueous solution.

[0004]

DISCLOSURE OF THE INVENTION The present invention is intended to provide a method for producing a surface-modified fiber by treating a mixed spun fiber with water to elute and remove at least a part of one polymer. Is.

[0005]

Means for Solving the Problems The present invention is to solve the above-mentioned problems, and the gist thereof is 90 to 99 parts by weight of a thermoplastic polymer A having a good fiber-forming property and a water-soluble or water-dispersible thermopolymer. A composition comprising 10 to 1 part by weight of a plastic water-absorbing polymer B is melt-spun from a fiber occupying at least a part of the fiber surface, a non-water oil agent is applied to the spun yarn and the fiber is taken up and wound at a high speed. Alternatively, it is a method for producing a surface-modified fiber characterized in that at least a part of the polymer B is eluted and removed by treating the obtained fiber with water after drawing and winding.

The present invention will be described in detail below.

In the present invention, examples of the thermoplastic polymer A having good fiber-forming property include polyolefins such as polyethylene and polypropylene, polyamides such as nylon 6, nylon 66, nylon 46, nylon 11 and nylon 12, polyethylene terephthalate and poly. Polyesters such as butylene terephthalate and copolymers or mixtures mainly of these are preferably used.

Further, the thermoplastic water-absorbing polymer B has a temperature of 300 ° C.
It is melt-processable at the following temperatures and is water-soluble or water-dispersible. As such a thermoplastic water-absorbing polymer, there is a cross-linked product of polyethylene oxide having a molecular weight of about 100,000 or less, which is commercially available from Sumitomo Seika under the trade name "Aqua Coke".

The proportions of polymer A and polymer B in the composition to be subjected to melt spinning are 90 to 99 parts by weight of polymer A and polymer B.
It is necessary to make it 10 to 1 part by weight. Since the polymer B does not have a good fiber-forming property, the polymer B
If the ratio is too large, the spinnability is poor and smooth spinning is difficult. On the other hand, if the proportion of the polymer B is too small, even if the elution treatment is performed, fine pore lines are not sufficiently formed on the fiber surface, and the modifying effect becomes insufficient.

The cross-sectional shape of the fiber to be spun is not particularly limited, and may be a circular cross section, or a modified cross section such as a triangular cross section or a star cross section.

Further, the fiber to be spun may be a fiber composed only of the composition of the polymer A and the polymer B, or may be a composite fiber in which this composition occupies a part of the fiber surface. For example, this composition can be used as a sheath component and a core-sheath type composite fiber having the polymer A as a core component. The polymer used for spinning may contain additives such as colorants and antioxidants, if necessary.

Although melt spinning can be carried out by a conventional method, it is necessary to use a non-aqueous oil agent as a spinning oil agent because the water-absorbing polymer is present on the fiber surface portion in the spun yarn. As the non-aqueous oil agent, an oil agent containing a mineral oil as a main component and containing a leveling agent, an antistatic agent, a sizing agent, etc. is preferably used.

The yarn to which the non-aqueous oil agent is applied must be wound at a high speed to obtain a highly oriented yarn, or drawn to be wound as a highly oriented yarn. In a method in which a low orientation undrawn yarn is wound and then drawn, it absorbs moisture before it is supplied to the drawing step, making it difficult to draw, and a good fiber cannot be obtained. It is necessary to select the winding speed in the case of winding at a high speed, the drawing speed in the case of winding after stretching and the draw ratio so that the obtained fiber has a strength of about 3 to 5 g / d suitable for clothing.

The resulting fiber was treated with water to give polymer B
Of at least a part thereof is eluted and removed to obtain a surface-modified fiber having fine pore lines on the surface. Although the elution treatment can be performed in the form of yarn, it is usually performed in the state of being woven or knitted. For the elution treatment with water, heated water is used if necessary, and it is preferable to adopt a method of treating with water and then washing with water.

[0015]

In the present invention, the formation of fine pore lines is
The polymer B scattered on the surface of the spun fiber is deformed in the fiber axis direction at the stage of forming the highly oriented yarn, and the deformed polymer B
Is eluted and removed with water.

[0016]

EXAMPLES Next, the present invention will be described in detail with reference to examples.

Examples 1 and 2 and Comparative Examples 1 and 2 As the polymer A, 96% sulfuric acid was used as a solvent, and the concentration was 1 g / dl.
Nylon 6 having a relative viscosity of 2.5 measured at a temperature of 25 ° C., a water-soluble thermoplastic water-absorbing polymer “Aqua Coke” as polymer B (polyethylene oxide cross-linked product with a molecular weight of about 10,000, manufactured by Sumitomo Seika) Was mixed and spun at the mixing ratio (weight ratio) shown in Table 1. At this time, the spinning temperature is set to 255 ° C,
The melt-spun yarn was blown with a horizontal blowing device using a 24-hole spinneret, and was blown with air at 12 ° C at a speed of 0.5 m / sec to cool it. so
It was drawn at a speed of 1000 m / min and continuously drawn 3.0 times between the take-up roller and the unheated drawing roller, and then 5
The yarn was wound at a relaxation rate of 70% to obtain a 70d / 48f yarn. Table 1 shows the quality of the yarn-forming property and the strength of the yarn. In addition, the quality of the thread-forming property is determined by performing the thread-forming process in which the 1 kg winding package is formed 5 times.
During the period, the yarn was broken, the single yarn was wound around the roller, and fluff was generated. ◯: Good, Δ: Slightly bad, X: Poor Also, the obtained yarn was used as a tubular knitted fabric, immersed in tap water at 30 ° C. for 15 minutes, and then air-dried. The fibers obtained by unraveling this tubular knitted fabric were observed at a magnification of 3000 using a Hitachi S-4000 type field emission scanning electron microscope. The observation results are shown in Table 1, and FIG. 1 shows a copy of an electron micrograph of the fiber obtained in Example 1. In addition, in the surface conditions in Table 1, ◯ indicates that there are sufficient fine pore lines, and x indicates that there are few fine hole lines.

Comparative Example 3 In Example 1, the undrawn yarn drawn by the take-up roller was once wound up, allowed to stand for one day, and then fed to a draw twisting machine under the conditions of a draw ratio of 3.0 times and a drawing speed of 680 m / min. Cold drawn. The results of the same evaluations as in Example 1 are shown in Table 1.

[0019]

[Table 1]

Examples 3 to 4 Polyethylene terephthalate having a relative viscosity of 1.37 measured at a concentration of 0.5 g / dl and a temperature of 20 ° C. was used as a core component in a solvent of an equal weight mixture of phenol and ethane tetrachloride as a sheath component. Using a composition in which the same polyethylene terephthalate (polymer A) as the core component and the same "Aqua Coke" (polymer B) as in Example 1 were mixed at the mixing ratio (weight ratio) shown in Table 2, the core-sheath composite weight was used. Concentric bicomponent fibers with a ratio of 3/1 were spun. At this time, the spinning temperature was 285 ° C., a 36-hole spinneret was used, and the melt spun yarn was cooled by blowing air at 15 ° C. at a rate of 0.8 m / sec using a cylindrical blowing device. A non-water oil agent was applied at a position of 1.5 m below the spinneret, and the fibers were bundled, then taken up by a take-up roller and taken up at a take-up speed shown in Table 2 to obtain a yarn of 75d / 36f. Table 2 shows the results of the same evaluations as in Example 1 using the obtained yarn.

Comparative Examples 4 to 5 The yarns wound up at the winding speed shown in Table 2 in the same manner as in Example 3 were supplied to a draw twisting machine, and the yarn was drawn using a 70 ° C. roller and a 150 ° C. heat plate. Stretch at the stretch ratio shown in 2 and
A yarn of d / 36f was obtained. Table 2 shows the results of the same evaluations as in Example 1 using the obtained yarn.

[0022]

[Table 2]

[0023]

According to the present invention, the surface-modified fiber can be produced by treating the mixed spun fiber with water to elute and remove at least a part of one polymer. Then, the fiber before elution and removal can be manufactured with good spinnability.

[Brief description of drawings]

FIG. 1 is a copy of an electron micrograph (magnification: 3000 times) of the fiber obtained in Example 1 of the present invention.

─────────────────────────────────────────────────── ─── Continuation of the front page (51) Int.Cl. ⁶ Identification code Internal reference number FI Technical indication location D01F 11/04 (72) Inventor Akira Yamamoto 23 Uji Kozakura, Uji City, Kyoto Prefecture Unitika Central Research Institute In-house

Claims (1)

[Claims] 1. A thermoplastic polymer A90 having a good fiber-forming property.
To 99 parts by weight and a water-soluble or water-dispersible thermoplastic water-absorbing polymer B10 to 1 part by weight, the fibers occupying at least a part of the fiber surface are melt-spun, and a non-aqueous spinning yarn is formed. A surface-modified fiber characterized in that an oil agent is applied and taken up, wound at a high speed, or drawn and then wound, and the resulting fiber is treated with water to elute and remove at least a part of the polymer B. Manufacturing method.