KR101134850B1 - Process Of Producing Sheath/Core Filament - Google Patents

Abstract

The present invention relates to a composite spinning method for producing a sheath / core composite filament by simultaneously spinning two polymer components through the same spinneret, in particular an alkali-elutable polyester as the core component and a modified polyamide as the sheath component. A sheath / core composite filament composed of a series polymer, an inorganic particle, and a usable polyester-based polymer, and relates to a hollow filament which elutes the core component inside the filament to form a hollow part in a process such as dyeing after filament production.

Sheath, Core, Alkali Solvent, Polyamide

Description

Process of Producing Sheath / Core Filament

The present invention relates to a method for producing a composite filament for the sheath / core, and more particularly to a method for producing a composite filament for the sheath / core for making a hollow filament by the elution process after manufacturing the filament.

R & D related to functional fibers is absorbed by synthetic fibers. It started with efforts to give hygroscopicity and make it closer to natural fiber. Currently, hollow fiber, conductive yarn, thermal insulation, heat storage fiber, photoluminescent fiber, and synthetic fiber having absorption and hygroscopic ability over natural fiber appeared. Highly functional fibers having excellent functions, which must be synthetic fibers, continue to be developed.

The high-performance fiber material is not only for clothing used as a general-purpose fiber material, but also for non-apparel fiber, such as high-performance fiber used in general industries such as automobile, aviation, civil engineering, and electronic medical use. Among them, functional fibers related to health, such as light weight, thermal insulation, deodorization, antibacterial, moisture absorption, and absorbent fibers, are growing in demand and interest. In the fields of space, automobiles, electronics and medical, new functional textiles are continuously being developed with the aim of super high strength, super heat resistance, and light weight to replace demand.

Among these different materials, hollow filaments have been steadily developed by many companies at home and abroad, and the development form of such hollow filaments is in the empty space inside the cross section of nylon single polymer using die swelling technology. It was common to have an air-filled structure, and diversification of design design using a hollow section stabilization technique or a hollow form stabilization technique to prevent the collapse of the internal hollow forming portion during the machining and weaving stages was the main direction.

Meanwhile, Korean Patent Publication No. 10-1996-0010919 proposes a hollow hollow fiber as a form of an eluted hollow filament, and Korean Patent Publication No. 10-2001-0047525 also discloses a hollow portion having a concentric shape on a fiber cross section. It suggests ~ 100 existing hollow hollow fiber. These techniques could express high hollow ratio through dissolution in dyeing process, but it was hard to dissolve by dissolving the part to be eluted, so the fastness of light fastness could be greatly reduced, and the hollow part in the yarn was crushed or damaged. The hollow ratio was greatly lowered and the sand strength after elution could be lowered by more than 30% than before elution, and the wear resistance was weakened, resulting in a decrease in tear strength in the fabric state as a final product and a significant decrease in the warmth and lightness of the fabric.

Therefore, the present invention is to provide a composite filament for the sheath / core that can produce a fabric excellent in tear strength and warmth and light weight by producing a hollow filament without increasing the elution rate without distorting the hollow portion and no strength reduction after dissolution It is a technical task.

Therefore, according to the present invention, in the method for producing a sheath / core composite filament, an alkali-utilized polyester polymer is supplied as the core component, and 90 to 99% by weight of modified polyamide polymer and titanium dioxide are used as the sheath component. 1-10% by weight of the fusible polyester-based polymer containing at least one inorganic particle selected from calcium carbonate and silica dioxide, followed by melt spinning through a sheath-core spinneret and cooling the thread Provided is a method for producing a sheath / core composite filament characterized in that the oil is fed and focused and wound after cooling while passing the section.

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

The present invention relates to a composite spinning method for producing a sheath / core composite filament by simultaneously spinning two polymer components through the same spinneret, in particular an alkali-elutable polyester as the core component and a modified polyamide as the sheath component. A sheath / core composite filament composed of a series polymer, an inorganic particle, and a usable polyester-based polymer, and relates to a hollow filament which forms a hollow part by eluting the core component inside the filament in a process such as dyeing after filament production.

In the method for producing the sheath / core composite filament of the present invention, as a core component, a conventional alkali-soluble polyol, such as a water-soluble polyethylene terephthalate polymer having 2-10 mol% of isophthalic acid or 5-sodium sulfoisophthalic acid copolymerized The use of ester is good for the smooth workability and productivity in filament production, and it reduces the tension deviation of the yarn during weaving, shows the elution performance in low temperature and short time during the dyeing process, and at the same time reduces the tear strength of the eluted hollow fabric. It is preferable in terms of preventing.

As the sheath component, a modified polyamide-based polymer, an inorganic particle, and a usable polyester-based polymer are mixed and used. The modified polyamide-based polymer includes 2 to 10% by weight of organicated montmorillonite, 0.5 to 5% by weight of coupling agent, and the balance. As a modified polyamide-based polymer comprising a nylon 6 resin, the water-soluble polyester-based polymer is an alkali-soluble polyethylene-terephthalate or a polylactide polymer to be used for the core component in a subsequent elution process, that is, an alkali weight loss treatment. While eluting, the inorganic particle component including the titanium dioxide and calcium carbonate or silica in the sheath portion is separated to form a channel between the core and the sheath, and as shown in FIGS. 1 to 4, the sheath portion 2 is fine. Alkali-soluble poly of the core component 1 by allowing the passage 3 to be formed It is preferable to switch to the hotel can be eluted easy through the micro-channel.

In particular, the core / sheath ratio is preferably 20:80 to 40:60. When the core component is less than 20%, the elution may take a lot of time and time, and the workability may deteriorate. There is a concern that the tear strength of the final fabric product due to the decrease in the strength of the yarn after dissolution is reduced along with the spinning workability.

Particularly, at least one inorganic particle selected from titanium dioxide, calcium carbonate and silica dioxide contained in the sheath component has a concentration of 20,000 to 60,000 ppm, which does not affect the polyamide component of the sheath portion during elution. By eluting the extruded polymer (soluble elutable polyethylene terephthalate or polylactide), it forms a micro-path connecting the core and the sheath part so that the core component can be smoothly eluted to make a perfect hollow part. The fall can be prevented.

 Inorganic particles used in the sheath portion is particularly preferable in that the use of inorganic particles having a size of 0.5 ~ 1.2㎛ or less in terms of preventing the radiation workability and deterioration of the physical properties and ensuring the optimum dissolution properties in the hollow filament. If it is less than 0.5㎛, it is difficult to overcome the entanglement caused by uneven dispersion of inorganic particles in the polymer, and if it exceeds 1.2㎛, it plays a weak role during spinning, which is a direct cause of cutting and fairness and filtering in the spinning nozzle. There is a problem to be accumulated in the floor.

Each of the polymers of the sheath component and the core component supplied is supplied to the sheath-core spinneret and spun simultaneously. In view of the yarn productivity and spinning workability, the spinning temperature is preferably adjusted to 275 ~ 285 ℃.

The yarns melted and spun at the same time through the spinneret are solidified by cooling while passing through the thread cooling section under the prison as in the conventional method. In the present invention, the yarns are cooled by a cooling wind of 10 to 20 ° C. The filaments solidified while passing through the yarn cooling section are focused and wound while applying oil.

The sheath / core composite filament manufactured by the sheath / core composite spinning method of the present invention is capable of complete dissolution in eluting the core part by a later dissolution process, thereby making it possible to make the hollow part uniform, and having strength and elongation. It may have excellent physical properties.

Therefore, according to the method of manufacturing the sheath / core composite filament of the present invention, even though the hollow ratio is 20% to 40% by the elution process, the hollow form is stable and the surface wear strength and the phosphorus are reduced despite the substantial loss caused by elution. It can provide the hollow filament with no deterioration of strength and elongation to the same as that of general fabric in heat strength, so it can be used as a lightweight and warm fabric and can be used for women's lingerie and sports uniforms.

The following examples are given as non-limiting examples of the method for producing the sheath / core-type composite filament of the present invention.

Example 1

Modified composition comprising a soluble polyethylene terephthalate polymer copolymerized with 6 mol% of 5-sodium sulfoisophthalic acid as a core component, 4 wt% of montmorillonite organicated as a sheath component, 2 wt% of coupling agent, and nylon 6 resin as the balance. It consists of 97% by weight of polyamide-based polymer and 3% by weight of fusible polyester-based polymer containing 40,000 ppm of inorganic particles containing titanium dioxide and calcium carbonate silicate, and has a relative viscosity of 2.40 to 2.60 and a Tg of 40 Supply a mixed polymer having a melting point of 210 to 225 ° C. and a melting point of 210 to 225 ° C., but the weight ratio of the core component and the sheath component is 30:70. After cooling while passing through the cooling section, apply oil and focus, and wind the sheath / core type composite filament of 50D / 24fila by winding at 4000 m / min. The.

After weaving the prepared sheath / core composite filament into a false twist form, weaving the fabric to warp: 50/24, weft: 50/24, weft density (10600 × 120), and caustic soda in a liquid reducer. The solution was eluted with 1N aqueous solution at 120 ° C × 30min, followed by dyeing while maintaining a low temperature set (160 ° C × 30M / min Stenter 8 chamber uniformity) and over feed rate at 15% or more in a jigger dyeing machine.

When measuring the physical properties of the fabric and hollow filament prepared as follows.

1) Hollow Filament Characteristics

  -Elution Hollow: 40.0%

  -Single thread fineness after dissolution: 1.0 d / fila

  -Warmth: 30.7%

  -Micropore size: 0.08-0.11㎛

The hollow ratio of the hollow yarn is expressed as the ratio of the hollow part area to the total cross-sectional area on the yarn cross section, and is taken as an average of 10 measurements.

The fineness is obtained by winding 90 times samples wound around a 1 meter Reel based on KS K0416 filament measuring method (corrugation method), drying the collected skein at 30 ℃ for 50 minutes in a heating chamber temperature, and weighing a tolerance of ± 0.5mg. The fineness of the yarn was measured by measuring the weight using.

Thermal insulation was measured by the KES-F7 Thermo Labo II according to the method of measuring the thermal insulation rate of KS K0560 fabric (constant temperature method). Thermal insulation was calculated by comparing the amount of heat consumed to maintain a constant temperature (35 ℃) of the sample plate with the heat consumed to maintain a constant temperature of the sample plate without covering the sample was calculated by the following equation .

Thermal insulation rate (%) = {1? (A ₂ ? A ₁ )} × 100

Here a _1: heat radiation amount in the absence of the test piece to the heating element (㎈ / ㎠ / sec or W / ㎠),

a ₂ : amount of heat dissipation when the test piece is attached to the heating element (㎈ / cm 2 / second or W / cm 2)

The micropore size is Au-Pd coated under 75 × 10 ^-3 mmHg reduced pressure, and the diameter of the micropore is measured using a scanning electron microscope (SEM) to determine the average value of 10 measurements.

2) Properties of the fabric

  -Water vapor permeability: 4103g / ㎡, 24h

  -Cutting strength: 19.8 kgf

  -Tear strength: warp 24.2N, weft 21.3N

1 is a cross-sectional micrograph of the filament after elution of the sheath / core-type composite filament of the present invention,

Figure 2 is an enlarged photograph of the cross-sectional micrograph of Figure 2,

3 is an enlarged photograph of the hollow wall portion in the photograph of FIG.

4 is a perspective view showing the shape of the filament after the sheath / core-type composite filament is eluted.

5 is a physical property test report of a fabric using the sheath / core composite filament of the present invention.

[Description of Drawings]

1: core part 2: sheath part

3: fine passage

Claims (4)

In the method of manufacturing the sheath / core composite filament, Supplying an alkali-utilized polyester polymer as the core component, 2-10% by weight of the montmorillonite organicated with the sheath component, 0.5-5% by weight of the coupling agent and 90 to 99% by weight of the modified polyamide-based polymer including nylon 6 resin as the balance, and selected from titanium dioxide, calcium carbonate and silica Sheath core with a core sheath ratio of 20:80 to 40:60 by supplying 1-10 wt% of an alkali-elutable polyethylene terephthalate or a polylactide polymer-soluble polyester-based polymer containing at least one inorganic particle. A method of manufacturing a sheath / core composite filament characterized in that the melt spinning is carried out at the same time through the rectangular spinneret, and the yarn is cooled while passing through the yarn-cooling section under detention. delete delete The method of claim 1, wherein the sheath component is one or more inorganic particles selected from titanium dioxide, calcium carbonate and silica dioxide at a concentration of 20,000 to 60,000 ppm.

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