KR100570984B1 - Ptt filament with fibril structure - Google Patents

Abstract

In the present invention, in order to solve the problems such as the generation of dyed lines and the strength degradation of the existing polyester fibril yarn and at the same time to express the unique soft characteristics only PTT yarn and organic sulfonic acid metal salt during the polymerization or during the polymerization process Spin by adding the same incompatible material. These yarns prevent the sudden alkali invasion of polyester fiber during the alkali weight loss process, minimizing the rapid decrease in strength and the generation of dyed streaks after weight loss processing, and also gives a very soft touch yarn.

Description

    Polytrimethylene terephthalate (PTF) yarn with fibril structure {PTT filament with fibril structure}             

1 is a side electron micrograph of a polytrimethylene terephthalate yarn according to the present invention.

2 is a cross-sectional electron micrograph of a polytrimethylene terephthalate yarn according to the present invention.

3 is the chemical formula of the fibrillation modifier used in the present invention.

The present invention relates to a polytrimethylene terephthalate (PTT) yarn having a fibril structure, and more specifically, to a problem of dyeing lines generated by polyester fibril yarns based on existing polyethylene terephthalate (hereinafter referred to as PET). After the weight loss, and to resolve the sudden drop in strength, it is characterized by obtaining a yarn that maximizes the soft properties of polyester yarn based on polytrimethylene terephthalate (hereinafter referred to as PTT).

Conventionally, when looking at the Mechanism in which FIBRIL is expressed, any material having incompatibility in the molten state of the polyester polymer, such as a modifier (mainly used by a material satisfying the structural formula of R-SO ₃ -Na +), is mixed. When it is spun together, the added material is concentrated on the outside of the fiber by the shear force received during spinning, and remains on the surface of the fiber in the form of a long rod by the tension force received immediately after the discharge. This material is very weak to alkalis such as NaOH, so it is known that elution proceeds while leaving the form of grooves during the weight loss process by alkali.

However, in the case of fibril yarn produced by the technique described in the above-described method, for example, Japanese Patent 1994-248512, when the dispersion of the modifier is somewhat uneven, alkali penetration is concentrated in the high density part of the modifier. Make the fibers in the area very thin or broken. The excessively reduced part is stressed when the tension is received after the weight loss, which causes the strength of the entire yarn to drop and causes the occurrence of streaks during dyeing. In order to solve this phenomenon, Japanese Patent No. 2000-119954 proposes a method of adding a dicarboxylic acid component or its ester-forming derivative and at least one diol component together with an organic sulfonic acid metal salt. Simultaneous or sequential dosing is very difficult to apply in actual spinning processes.

In order to express uniform fibrils and maintain strength, Korean Patent No. 1999-0065009 introduces a technique for introducing a release cross section, but this method may also be disadvantageous in that facility investment must be carried out separately from spinneret. .

In addition, as mentioned in WO 2000/22210, a yarn having an elongation of 36% to 50% is obtained through a two-stage process of spinning-stretching or a one-stage process of spinning and stretching simultaneously. PTT yarn produced by tension heat treatment (100 ~ 150 ℃) has a very soft characteristics compared to PET yarn, the drawback, such as low hygroscopicity and sticky slime inherent in synthetic fibers are still unresolved.

The present invention has been proposed in view of the above problems, and an object of the present invention is to add a metal salt of eutectic acid during the spinning of PTT yarns, thereby improving the strength degradation phenomenon of conventional polyester fibrillated yarns and reducing the occurrence of dyeing lines. have.

Another object of the present invention is to maximize the soft properties of the PTT fiber by fibrillating the surface of the PTT yarn, and to eliminate the stickiness of the polyester yarn. In addition, the fabric having the micro-touch obtained in this way has a higher repulsive force than the micro fabric obtained in the island-in-the-sea yarn, the split yarn.

In order to achieve the object as described above, the yarn having a fibrillated structure according to the present invention, PTT having an alkali impregnation rate of half the level of PET compared to PET, and the alkali impregnation rate is significantly higher than that of PET. It is slow, which prevents a drastic loss of the concentration of the modifier. In addition, the concentration of the weight loss liquid may change slightly as the process proceeds or at the time of processing. At this time, if the PTT is used, the variation of the weight decreases with respect to the NaOH concentration change, and the dyeing stain that may occur when the weight of PET fabric is reduced This can reduce the number of factors, such as joules and joules. This effect soon serves to reduce the strength of the yarn before and after the weight loss, it is possible to fabricate the fabric using se fine fibrillated yarn and fibril yarn of less than 50 de '.

In addition, in the case of PTT yarns, the manufacturing conditions are more difficult than those of PET yarns, and the radioactivity of mono fineness of 1de 'or less is somewhat disadvantageous. When fibril modifier is applied, mono fineness of 2 ~ 3 de' is soft and 1de 'or less soft yarn. One touch expression is possible.

In order to obtain the yarn as described above, the organic sulfonic acid metal salt, a modifier of the type as shown in FIG. 3, is mixed with 1.0% to 5.0% during the spinning process to spun partially drawn yarn or drawn yarn, and 15% of the texture can be felt. Abnormal alkali weight loss treatment should be carried out. If the content of the organic sulfonic acid metal salt is more than 3.0%, the workability of the spinning and the pressure of the spinning PACK will rise quickly. Therefore, the content of the organic sulfonic acid metal salt within 3.0% is advantageous for the radioactivity, and when the reduction rate is 25% or more, it was confirmed through electron microscopy (SEM) pictures that sufficient fibrils are expressed.

When spinning through the POY process, stable operation was possible at a spinning speed between 2700MPM and 3300MPM. In the present invention, a partially drawn yarn is obtained at a spinning speed of 3000MPM and a draw ratio of 1.68 is applied by using a DT machine to completely draw yarn. Got it. Sodium Dodecyl Sulfonate was used as the organic sulfonic acid metal salt as a fibril expression modifier used here.

The measurement of each property and physical properties of the present invention was measured by the following method.

(1) Measurement of fineness, river and elongation

   The fineness of the yarn was obtained by winding 90m of a 1m skein in a single rotation and measuring the weight and converting it to 9000m.

   The strength and elongation of the fibers were measured by applying a gripping distance of 50 cm / m and a 50 cm using Instron.

(2) Alkali weight loss and loss rate measurement

    The weight loss was made at 90 ° C. in 5% aqueous NaOH solution, and the weight loss rate was calculated by the following equation through the relationship between the weight before the weight loss (W0) and the weight after the weight loss (W1).

     Reduction ratio = (W0-W1) / W0 * 100

(3) observation of fiber surface after weight loss

   It observed using the electron microscope (SEM), and the magnification was made 1000 times.

   The table below shows the strength and elongation of the yarn by modifier content and weight loss rate. The measurement method was followed by the above measurement method, and the yarn was spun to 126 de / 36f partially drawn yarn, and the drawn yarn was obtained by applying a draw ratio of 1.68 in the DT machine.

Hereinafter, the present invention will be described in detail with reference to Examples and Comparative Examples.

 Example 1

 In spinning the PTT fiber of IV 1.13, 1.0% of the organic sulfonic acid metal salt is mixed and spun through a side feeding device during the polymerization process or the spinning process, and 15, 30% is reduced to prepare PTT fiber having fibril properties.

 Example 2

 Same as Example 1 except that the content of sodium dodecyl sulfonate was 2.0%.

 Example 3

 Same as Example 1 except that the content of Sodium Dodecyl Sulfonate was 3.0%.

 Example 4

 Same as Example 1 except that the content of sodium dodecyl sulfonate was 5.0%.

 Comparative Example 1

 Fibrillated yarns were spun by using PET and adding 1.0% Sodium Dodecyl Sulfonate through side feeding during polymerization or spinning as in Example 1.

 Comparative Example 2

 Same as Comparative Example 1 except adding 2.0% of sodium dodecyl sulfonate.

 Comparative Example 3

 Same as Comparative Example 1 except adding 3.0% of sodium dodecyl sulfonate.

According to the yarn having a fibrillated structure according to the present invention as described above, by using PTT without the main component of the existing polyester fibrillated yarn, using PTT to slow the alkali loss rate to prevent rapid alkali invasion, high strength, A uniform fibrils can be obtained, which can solve the shortcomings of existing fibrils and at the same time enhance the softness of PTT.

Claims (3)

     Characterized by mixing and spinning 1.0 wt% to 5.0 wt% of organic sulfonic acid metal salt in PTT yarns having an intrinsic viscosity of 0.80 to 1.30 consisting of 95 mol% or more trimethylene terephthalate repeat units and 5 mol% or less other ester repeat units. Polytrimethylene terephthalate yarn with fibril structure.      The polytrimethylene terephthalate yarn having a fibril structure according to claim 1, wherein the PTT yarn is reduced by 15% or more, so that the soft and strength of the yarn is 82% or more of the yarn before the weight loss.     The polytrimethylene terephthalate yarn having a fibril structure according to claim 1, wherein the fibril structure has a slit width of 0.1 to 3 µm and a length of 2 to 50 µm.

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