KR20030091285A - Polytrimethyleneterephtalate conjugated fiber and preparation thereof - Google Patents

Abstract

PURPOSE: Polytrimethylene terephthalate conjugate fiber is characterized by having 2.0-3.3g/de of strength, 45-65% of elongation and at least 20% of crimp rate and spontaneous high crimp characteristics on flat yarn type. A manufacturing method thereof is characterized by using polytrimethylene terephthalate having different two inherent viscosities and having excellent spinning processability. CONSTITUTION: The polytrimethylene terephthalate conjugate fiber is obtained by: using polytrimethylene terephthalate having 0.05-0.15 of difference of the inherent viscosities; and then conjugate-spinning the polytrimethylene terephthalate at 235-275deg.C on a side by side type.

Description

Polytrimethylene terephthalate composite fiber and its manufacturing method {Polytrimethyleneterephtalate conjugated fiber and preparation

The present invention relates to a method for producing a polyester-based composite fiber, and more particularly, by spinning a polyester having a different intrinsic viscosity to have a side by side cross-sectional shape in the fiber length direction, subsequent relaxation heat treatment It relates to a method for producing a polyester-based composite fiber to exhibit spontaneous high crimp characteristics in the process. In particular, the present invention relates to a method for producing a fiber capable of expressing crimping performance and having good spinning processability even in a range in which the intrinsic viscosity difference between two polymers is smaller than that of the existing invention.

Conventionally, several methods are known as a method for producing a side by side type composite fiber. Among them, first, a composite of polyester and its copolymer having high shrinkage characteristics using a side by side type composite spinning method Second, a method of manufacturing fibers and a method of composite spinning a polyester having a different intrinsic viscosity into a side by side type. However, such a manufacturing method has a disadvantage in that physical properties of the copolymer are generally lowered, spinning processability is poor, and physical properties such as crimping property of the composite fiber are lowered.

In particular, as an example of complex spinning using inherent viscosity differences, Japanese Patent Application Laid-Open No. 2000-256918 discloses that 85 mol% or more of the repeating units are trimethylene terephthalate units and three or more ester-forming functional groups. 85 mol of polyester B or the repeating unit which is not copolymerized with polyester A, and 85 mol% or more of a repeating unit is a trimethylene terephthalate unit, and the component which has three or more ester-forming functional groups is 0.5-0.20 mol%. At least% of trimethylene terephthalate units and components having three or more ester-forming functional groups are not copolymerized, and polyester C, which has an intrinsic viscosity of 0.15-0.30 lower than polyester A, is compounded in a side-byside or eccentric cisco type. Potentially crimped polyester composite fibers are described. Such fibers have a difference in intrinsic viscosity between the two components in order to express crimp performance, and the crimp characteristics are not satisfactory in the form of flat yarns, so that they have satisfactory crimping characteristics. Due to the difference in intrinsic viscosity, the curvature phenomenon is severe in the lower part of the nozzle, the spinning processability is very poor, and if the intrinsic viscosity difference is small, the spinning processability is good, but it is difficult to express the crimp characteristics of the final fiber.

Accordingly, the present invention is to provide a polyester-based composite fiber of the side-by-side type without the above disadvantages.

In the study of the present inventors for solving the above problems, the composite spinning of polytrimethylene terephthalate having a different intrinsic viscosity with a side by side type with a difference of 0.05 or more and less than 0.15 can produce a composite fiber with excellent spinning processability, The composite fiber produced was found to exhibit spontaneous high crimp properties even in the form of flat yarns rather than combustible yarns, thereby completing the present invention.

1 is a view illustrating an example of a cross-sectional shape of the polytrimethylene terephthalate composite fiber prepared according to the present invention,

Figure 2 is a schematic diagram of the extruder and spinning equipment used in the embodiment of the present invention

Therefore, a polytrimethylene terephthalate composite fiber containing polytrimethylene terephthalate having an intrinsic viscosity different from each other with an intrinsic viscosity difference of 0.05 or more and less than 0.15 and having a side by side composite structure is provided.

Further, according to the present invention, in the production of polytrimethylene terephthalate composite fibers, polytrimethylene terephthalate having different intrinsic viscosities with different intrinsic viscosities of 0.05 or more and less than 0.15 is spun by a side by side type complex spinning method There is provided a method for producing a polytrimethylene terephthalate composite fiber.

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

In the present invention, polytrimethylene terephthalate having different intrinsic viscosities radiated by the side by side type complex spinning method has a difference in intrinsic viscosity of 0.05 or more and less than 0.15. In this way, if the intrinsic viscosity difference between the two components is set in the small range as described above, it is possible to spin without a separate nozzle design, the spinning processability is good, and the polymer having a small intrinsic viscosity difference by setting the temperature conditions of the appropriate extruder In addition, the crimping properties of the final fiber are also excellent. Hereinafter, polytrimethylene terephthalate with high intrinsic viscosity is abbreviated as "PTT-H", and polytrimethylene terephthalate with low intrinsic viscosity is abbreviated as "PTT-L". In the present specification, PTT-H and PTT-L are based on terephthalic acid and propanediol, which means that the trifunctional ester forming component is not copolymerized.

In general, when the difference in intrinsic viscosity between PTT-H and PTT-L is less than 0.15, the difference in melt viscosity between the two components is small, so that the shrinkage difference between the two components is small, and thus the crimp ratio of the final fiber is not obtained satisfactorily. come. However, even in the combination of polymers having such a small viscosity difference, polytrimethylene terephthalate having a crimp ratio satisfactory even when using polymers having a viscosity difference as described above when the melt viscosity difference or the composite ratio between the two components during spinning is controlled. It is possible to produce composite fibers.

Melt viscosity difference control between the two components can be achieved by varying the thermal history of each component polymer melt by changing the temperature conditions of the extruder of each component or by adjusting the component ratio of the high viscosity component and the low viscosity component. It is appropriate to control the spinning temperature within the range of 235 ~ 275 ℃ in order to make PTT-H and PTT-L have a proper difference in melt viscosity during spinning. For example, in the apparatus diagram of FIG. 2, it is appropriate to adjust the temperature at the C4 position of each extruder within the range of 235-275 ° C. Although not particularly limited, when the melt viscosity is to be adjusted between the two components, the difference is suitably 1000 poise or less, more preferably 300 poise or less.

In the present invention, it is preferable that PTT-H and PTT-L have different intrinsic viscosities among intrinsic viscosities in the range of 0.7-1.1, and the intrinsic viscosity difference between the two components is preferably 0.05 or more and less than 0.15. In particular, it is preferable that K value calculated by the following formula (1) is 0 <K ≦ 0.09.

K = {[η] _H- [η] _L } / {[η] _H + [η] _L }

Where [η] _H is the intrinsic viscosity of PTT-H and [η] _L is the intrinsic viscosity of PTT-L.

In addition, the ratio of the composite fiber of PTT-L is suitably 30-70% of the total weight, and the ratio of the composite fiber of PTT-H is 70-30% of the total weight.

Although not particularly limited, the winding speed in this method is preferably 1,600-4,000 m / min, the stretching temperature is 50-60 ° C, and the heat treatment temperature is 140-220 ° C.

The composite fiber of the present invention preferably has a crimp rate of 20% or more as measured by the method described below. Polytrimethylene terephthalate side-by-side composite fiber has a crimp ratio of 20% or more to enable the fabric to have a desired stretch property. If the crimp ratio is less than 20%, the elastic properties are poor in fabric production. Done.

Moreover, it is preferable that the composite fiber of this invention is 2.0-3.3 g / de in strength, and 45-65% of elongation. When the strength is less than 2.0 g / de, the strength is low, so there is a lot of thread trimming and the workability is poor during fabric manufacturing, and when the strength is more than 3.3 g / de, the touch is poor after fabric manufacturing. In addition, when the elongation is less than 45% is likely to occur during spinning, when more than 60% may be a poor uniformity (U%).

Hereinafter, the present invention will be described in more detail by way of example. However, the present invention is not limited to the following examples. Various physical property evaluation methods used in the following Examples and Comparative Examples are as follows.

* Intrinsic Viscosity (IV): Each polymer was sufficiently dissolved in 120% ortho-chlorophenol at 1% concentration, and then measured using a Uberod viscometer in a 30 ° C thermostat.

Crimping rate (TC,%): Take a sample of 3000 deg given the amount of tension of 50 mg / de. This sample was treated with hot water (100 ° C) for 20 minutes under a load of 0.5 mg / de, which was a load at which no fiber was entangled when crimping occurred during hot water treatment. Allow it to cool for a while to allow natural drying. After natural drying, 2 mg / de is applied to the sample, and the length L ₁ is measured after 1 minute. After the measurement of L _1, a load of 2 mg / de + 200 mg / de is measured, and the length L ₂ is measured after 1 minute. The crimp rate is calculated by substituting the measured value into the following Equation 2.

TC (%) = (L ₂ -L ₁ ) / L ₀ × 100

* 30% elongation elastic recovery rate of fabric (FR ₃₀ ,%): After making three pieces of fabric, each 5.5cm × 30cm in the direction of light and weft, the width of the specimen is 5cm and attached to the tensile tester to give super load. Allow the specimen to unfold. Elongation at the time of stress-extension curve in the stress-extension curve by stretching to 30% of elongation at the rate of 100% / min with the low speed extension method (JIS L 1018-70) Measure (ε) and take the average of each of the warp and weft directions to obtain Equation 3.

FR ₃₀ (%) = (30-ε) / 30 × 100

[Examples 1-1 to 1-4]

In the extruder and the spinning equipment as shown in FIG. After spinning at a speed of 2000m / min using a side-by-side spinning nozzle at and stretched at a draw ratio of 1.5 times, stretching temperature 55 ℃, heat treatment temperature 220 ℃. Cooling air at 23 ° C. was supplied at a speed of 0.3 m / sec at 5 to 120 cm under the nozzle, and an oil coating amount (OPU) was given in the range of 0.5 to 1.0 wt%. The fabric thus prepared was dyed at 105 ° C. after fabrication of 100 g / m 2 using both light and weft yarns. The IV difference between the two components was 0.1 and the K value was 0.053. Table 1 below shows the difference in intrinsic viscosity of PTT-H and PTT-L used in this example, and summarized in Table 1 by evaluating the basic properties and crimp rate according to the extrusion temperature change. The extrusion temperature here is the temperature of the C4 part in the two extruders of FIG.

Example No. Extrusion Temperature (℃) Radiation Beam Temperature (℃) K value Strength (g / de) Elongation (%) Crimp rate TC (%) FR ₃₀ (%) PTT-H PTT-L 1-1 260 265 265 0.053 2.92 52.4 37.2 96 1-2 255 265 265 0.053 2.89 53.7 38.4 97 1-3 250 265 265 0.053 2.86 55.7 42.3 97.5 1-4 265 260 265 0.053 2.84 53.7 32.3 94

[Examples 2-1 to 2-6]

PTT-H and PTT-L having different intrinsic viscosities (IV) were spun at a speed of 2000 m / min using a side-by-side spin nozzle at 265 ° C, and the draw ratio was 1.5 times, the stretching temperature was 60 ° C, and the heat treatment temperature. Stretching was performed at 200 ° C., and relaxation heat treatment was performed in water at 90 ° C. The basic properties and crimp rate of the prepared composite fibers were evaluated and summarized in Table 2.

Example No. PTT-H PTT-L IV tea K value Strength (g / de) Elongation (%) Crimp rate TC (%) FR ₃₀ (%) Intrinsic viscosity Ratio (wt%) Intrinsic viscosity Ratio (wt%) 2-1 1.0 50 0.90 50 0.10 0.053 2.91 53.3 36.4 96 2-2 1.0 50 0.85 50 0.15 0.008 2.81 55.7 42.4 98 2-3 1.0 55 0.90 45 0.10 0.053 2.83 54.2 37.4 97 2-4 1.0 60 0.90 40 0.10 0.053 2.84 53.7 41.3 98 2-5 1.0 70 0.90 30 0.10 0.053 2.84 54.2 43.2 98.4 2-6 1.0 40 0.90 60 0.10 0.053 2.80 56.4 32.4 94

As will be apparent from the above experimental results, the use of polytrimethylene terephthalate having an intrinsic viscosity difference defined in the present invention results in spontaneous high crimping characteristics even in the form of flat yarns rather than combustible yarns. It is possible to produce composite fibers.

Claims (8)

In the production of polytrimethylene terephthalate composite fibers, polytrimethylene terephthalate having different intrinsic viscosities having different intrinsic viscosities of 0.05 to less than 0.15 is spun by a side by side type composite spinning method. Method for producing phthalate composite fiber. The method according to claim 1, wherein polytrimethylene terephthalate (PTT-H) having a high intrinsic viscosity and polytrimethylene terephthalate (PTT-L) having a low intrinsic viscosity have different intrinsic viscosity from 0.7 to 1.1. Method for producing a polytrimethylene terephthalate composite fiber characterized in that it has. The polytrimethylene terephthalate (PTT-H) having a high intrinsic viscosity and the polytrimethylene terephthalate (PTT-L) having a low intrinsic viscosity are calculated by Equation 1 below. Method for producing a polytrimethylene terephthalate composite fiber, characterized in that to satisfy: Equation 1 K = {[η] _H- [η] _L } / {[η] _H + [η] _L } [Η] _H is the intrinsic viscosity of PTT-H, and [η] _L is the intrinsic viscosity of PTT-L. The composite fiber of the polytrimethylene terephthalate having high intrinsic viscosity is 30-70% of the total weight, and the proportion of the composite fiber of polytrimethylene terephthalate having a low intrinsic viscosity is 70- of the total weight. Method for producing a polytrimethylene terephthalate composite fiber, characterized in that 30%. The polytrimethylene terephthalate composite fiber according to claim 1, wherein the spinning temperatures of the polytrimethylene terephthalate having a high intrinsic viscosity and the polytrimethylene terephthalate having a low intrinsic viscosity are respectively in the range of 235 to 275 ° C. Manufacturing method. A polytrimethylene terephthalate composite fiber comprising a polytrimethylene terephthalate having an intrinsic viscosity different from each other with an intrinsic viscosity difference of 0.05 to less than 0.15 and having a side-byside composite structure. The polytrimethylene terephthalate composite fiber according to claim 6, wherein the strength is 2.0 to 3.3 g / de and the elongation is 45 to 65%. The polytrimethylene terephthalate composite fiber according to claim 6, wherein the crimp ratio is 20% or more.