JPH08246340A - Polyester tow for stretch-breaking spinning - Google Patents

Abstract

PURPOSE: To obtain polyester tow for stretch-breaking spinning showing good stretch-breaking properties and giving an animal hair-like touch by applying inorganic fine particles of a specific shape through a surfactant to the surface layer of the filament of polyester tow with reduced elongation at break. CONSTITUTION: Inorganic fine particles are applied through a surfactant to the surface layer of the filaments whose elongation at break is lowered to less than 55%, preferably less than 50%. The volume shape factor of the inorganic particles is 0.35-0.52 and the particle is preferably made of silica. In the super-bright or bright fine-denier filaments, the problems on mass breakage of the tow and entanglements around the rollers are dissolved, while, in the semi-dull or full-dull polyester tow, its productivity is increased up to the same level as that of the acrylic tow.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a polyester tow for sawing and spinning. More specifically, it has good tenacity and has excellent texture like animal hair and also in blended spinning. The present invention relates to a polyester tow for saw spinning, which provides a fabric having the mechanical properties of polyester fiber while making the best use of the texture of animal hair.

[0002]

BACKGROUND ART Wool is the most popular animal fiber among natural fibers, and it is widely used not only as a material for autumn and winter such as coats, suits and sweaters, but also as a material for thin spring and summer. are doing.

High-quality animal hair fiber materials such as cashmere and vicuna have a fineness (2.5 d or less) and a relatively long fiber length (50 to 130 mm), which is a supple and warm weave that cannot be expressed by ordinary wool materials. A knit can be provided.

However, the spun yarn spun with only these natural materials has a relatively low strength, so that the durability is poor and the after-care may be difficult. Also, when trying to obtain a spun yarn with a relatively fine count, the fineness is thin,
It is necessary to use animal hair raw materials having a long fiber length, and there is a problem that these are expensive.

Polyester fibers have been proposed and used as a blending partner for animal hair fibers in terms of price, strength backup, and texture such as tension and waist. However, polyester staples with a fineness and a relatively long fiber length have a significantly poor spinning property, and particularly in the card process, a decrease in productivity due to cylinder wrapping and a decrease in sliver quality due to the occurrence of nep are major problems, and satisfactory spinning is achieved. I haven't got the thread.

On the other hand, as a spinning method aiming at improving the spinnability of fine fibers, there is a tentering spinning, which is widely used to obtain bulky spun yarn or high-strength spun yarn after directly cutting the tow into a sliver. Has been done. Since this method can easily obtain a sliver having a relatively fineness and a long fiber length, it is used for acrylic fibers and the like.

In the case of polyester fiber, titanium oxide is 0.2
The above problem is not noticeable in the varieties using polymers containing more than 50%, but stable production is possible, but still,
In terms of production capacity, it is only about 50% of acrylic fiber. Furthermore, it was difficult to stably produce fine-fineness varieties using super bright polymers that do not contain titanium oxide.

As a reason for this, when attention was paid to the surface state of the fiber and its cause was sought, it was found that since titanium oxide is contained and the resistance becomes large, the fiber constituting the tow becomes poor in the splitting property, and when the fiber is cut, There is a tendency for troubles such as group breakage or static electricity generation to occur easily.By simply lowering elongation and optimizing the surfactant, production troubles such as group breakage that occurs during breaking and roller winding due to static electricity generation can occur at the same time. It turned out to be difficult to solve. Of course, it is possible to improve the above-mentioned trouble by adding baby powder or French choke at the time of cutting, but the workability is deteriorated and it cannot be adopted for normal production.

[0009]

The object of the present invention is to solve the production troubles such as the group cutting at the time of cutting the super bright fine-fineness varieties, the winding of rollers, etc. (EN) It is intended to provide a polyester tow for a spinning machine capable of improving the production capacity of a variety of polymers containing 0.2% or more to the production capacity of an acrylic fiber.

[0010]

In order to solve the above-mentioned problems, the polyester tow for towing spinning of the present invention has the following constitution. That is, it is a polyester tow for which the breaking elongation of the single fiber is 55% or less, and the inorganic fine particles are attached to the surface layer of the single fiber via a surfactant, .

The present invention will be described in detail below.

The titanium oxide content of the fibers constituting the polyester tow for sawing and spinning of the present invention is not limited. This is because in the bright polymer having a titanium oxide content of 0.2% or less and in the super bright polymer not containing titanium oxide, the polyester tow having a titanium oxide content of more than 0.2% is obtained. In order to raise productivity to the level of acrylic tow.

The average value of the cutting elongation of the single fibers constituting the tow of the present invention is 55% or less, preferably 50% or less. If the average value of the breaking elongation of the single fiber exceeds 55%, the breaking property becomes poor and the object of the present invention cannot be achieved.

The monofilament fineness constituting the tow of the present invention is preferably 2.5 denier or less from the viewpoint of improving the texture for clothing and improving the breaking property. The total fineness of the tow of the present invention is preferably 100,000 to 1,000,000 denier, more preferably 300,000 to 600,000 denier from the viewpoints of operability, productivity, capacity of a sawing device, packaging form and the like.

The average strength of the monofilament constituting the tow of the present invention is 2.3 to 9 g / from the viewpoint of excellent anti-pill property.
d, more preferably 2.5 to 5 g / d.

The cross-sectional shape of the single fiber may be a round cross section, a polygonal cross section such as a triangular cross section or a square cross section, a flat cross section, a hollow cross section and the like. Further, it may be a fiber in which different kinds of polymers are composited, and the composite form may be a core-sheath structure, a side-by-side structure, a split structure, or a sea-island structure.

Further, the tow of the present invention is one in which the inorganic fine particles are attached to a part of the surface layer of the single fiber through a surfactant.

Examples of the inorganic fine particles usable in the tow of the present invention include metal oxides such as titanium oxide, aluminum oxide and zinc oxide, and fine particles such as magnesium carbonate, calcium carbonate, silica, talc, zirconia and silicon nitride. Of these, silica is preferable. From the viewpoint of exhibiting the effect of lowering the frictional resistance while preventing damage to the single fibers and preventing the fibers from falling off, the average particle size of the inorganic fine particles is preferably 1 to 200 mμ, and more preferably 5 to 50 mμ.

The shape of the inorganic fine particles is not particularly limited to a substantially spherical shape, a needle shape, a plate shape, etc., but a shape close to a spherical shape, in other words, a volume shape factor of 0.35 to 0.52, preferably 0. It is preferably 45 to 0.52. When the volume shape factor is less than 0.35, the fibers are likely to fall off, the surface of the single fiber is easily scratched, and the breaking property is deteriorated.

To obtain particles having a volumetric shape factor of 0.35 to 0.52, for example, in the case of silica, a method of hydrolyzing a metal alkoxide may be used.

Here, the volume shape factor means the particle volume by V
(Μm ³ ), a value obtained by V / D ³ when the maximum diameter on the particle projection surface by SEM is D (μm).

Further, when the inorganic fine particles are attached to the fiber surface via the surfactant, they may be aggregated, but it is preferable that they are uniformly attached without being aggregated as much as possible.

As for the surfactant, it imparts appropriate sliminess and prevents the generation of static electricity at the time of cutting, and it can be wound around a roller together with the inorganic fine particles adhered to the surface of the single fiber through the surfactant. A material that can effectively prevent troubles during cutting is preferably used.

The amount of the surface-active agent deposited on the tow is 0.1 from the viewpoint of improving the breaking property, while preventing the surface-active agent from falling off the roller to prevent problems such as winding.
It is preferably 3 to 3% by weight, more preferably 0.1 to 1.5% by weight.

Next, an example of the method for producing the tow of the present invention will be described.

The tow of the present invention uses a commonly used polyester polymer, and is discharged through a spinneret using an appropriate spinning machine to form a fiber. The fibrous material discharged from the die is taken up by a capstan roller, stored in a can, and then the tows are aligned and stretched. When the tows are aligned, they are aligned so that the total fineness after stretching is 100,000 to 1,000,000 denier. The stretching method can be performed by a conventional method.

The monofilament constituting the tow of the present invention has a cutting elongation of 55% or less as described above. As one of the methods for obtaining the tow having such physical properties, it is possible to use a hot plate or a heat drum. There is a method of heat treatment while limiting shrinkage. The heat treatment temperature is preferably about 100 to 230 ° C., and some stretching or relaxation may be performed during the heat treatment.

After the heat treatment, crimping is applied by a crimping applicator and, if necessary, further dried at a temperature of about 50 to 150 ° C. to produce a tow having a single fiber cutting elongation of 55% or less. it can.

As described above, it is necessary to add the inorganic fine particles and the surfactant to the tow of the present invention, and they can be added individually or in a mixed state.
As a method of applying the inorganic fine particles and the surfactant to the tow alone or in a mixed state, it is general to apply by a dipping method or a spraying method. The application may be performed before or after the tow is stretched, after the heat treatment under constant length, after the crimping, and after the drying, and it may be carried out at one place or a plurality of places in these steps. .

Hereinafter, the present invention will be specifically described with reference to experimental examples.

[0031]

【Example】

(Example 1) Super bright polyester polymer containing no titanium oxide was fibrous discharged from a spinneret heated to 285 ° C, and an undrawn yarn drawn at 1130 m / min had a final total fineness of 500,000 denier. I arranged like this. This unstretched yarn tow was passed through an oil bath and stretched 3.6 times in a heated liquid. Then, it heat-processed on the heating drum of 170 degreeC, and crimping was given with the push-in type crimping giving device.

After the crimping, a 1.3% by weight aqueous solution of anionic surfactant has a volume shape factor of 0.51 and an average particle diameter of 20 mμ of silica fine particles (obtained by a hydrolysis method of metal alkoxide). Was added by a spraying method by spraying, and dried by a hot air dryer at 90 ° C. to obtain a tow of the present invention. The single fiber fineness of the obtained tow was 1.5 denier.

The tows thus obtained were evaluated for their breaking properties in a tow reactor manufactured by OM. The region where the tow is cut is a multi-stage stretching type with 6 stages. In that region, the stretching is gradually performed so that the cutting can be smoothly performed in advance, and then the cutting is performed. The total draw ratio including cutting was 6.9 times.

At the tow reactor speed of 100 m / min, the cutting performance was good, and it could be cut without troubles such as static electricity generation and collective breakage. The conditions and the evaluation results are shown in Table 1.

[0035]

[Table 1] (Comparative Example 1) Using the same polymer and the same equipment as in Example 1, a tow was obtained under the same conditions of spinning, drawing, heat treatment and crimping.

After the crimping, 1.3% by weight of an anionic surfactant was mixed with silica fine particles having a volume shape factor of 0.25 and an average particle diameter of 20 mμ (a dry silica pulverized product).
The mixed liquid added with 5% by weight was applied by a spraying method using a spray, and dried by a hot air dryer at 90 ° C. to obtain a tow. The single fiber fineness of the obtained tow was 1.5 denier.

The tow thus obtained was evaluated for breaking performance in the same tow reactor as used in Example 1. As a result, a large number of outbreaks occurred. Therefore, the magnification of the tow reactor was changed and the tow reactor speed was changed to 100 m / m. However, stable production was difficult. The conditions and evaluation results are also shown in Table 1.

Example 2 Using the same apparatus as in Example 1 except that a semi-dal polyester polymer containing 0.4% of titanium oxide was used, spinning, drawing, heat treatment and crimping were performed under the same conditions. The same surfactants and silica fine particles as in Example 1 were applied under the same conditions. . The single fiber fineness of the obtained tow was 2.0 denier.

The tow thus obtained was evaluated for breaking performance in the same tow reactor as used in Example 1. The total stretching ratio including stretching and breaking was 6.4 times.

At the tow reactor speed of 100 m / min, the cutting performance was good and the cutting could be done without troubles such as static electricity generation and collective breakage.

Further, as a result of carrying out the breaking under the condition that the draw ratio was lowered to improve the productivity, it was possible to cut without any problem even at the total draw ratio of 6.4 times. Furthermore, the tow reactor speed is 100m /
It was confirmed that it could be torn off, even though it took a short time for two pieces of 500,000 denier tow.

Table 2 shows the conditions and the evaluation results.

[0043]

[Table 2] (Comparative Example 2) Spinning, stretching, heat treatment and crimping were performed using the same polymer and the same equipment as in Example 2, and the same surfactants and silica fine particles as in Comparative Example 2 were also applied under the same conditions.

The tows thus obtained were evaluated for their breaking properties in the same tow reactor as used in Examples 1 and 2. As a result, a slight waviness was observed in the breaking region and uneven sliver thickness was generated. It was Furthermore, there were frequent outages. The conditions and the evaluation results are also shown in Table 2.

[0045]

Industrial Applicability According to the present invention, the polyester tow for fine-spinning spinning using the superbright polymer containing no titanium oxide and the bright polymer having a low titanium oxide content, which has been difficult in the past, is improved in the cutting property, and is cut into groups. It is now possible to provide polyester tow for tow spinning, which does not easily cause problems such as roller winding due to static electricity.

Further, it becomes possible to provide a polyester tow for a spinning machine, which can obtain the same productivity as an acrylic tow for a polyester tow using a semi-dal polymer or a full-dal polymer containing a certain amount of titanium oxide. .

Claims (4)

[Claims] 1. A polyester tow having a breaking elongation of a single fiber of 55% or less, in which inorganic fine particles having a volumetric shape factor of 0.35 to 0.52 are attached to the surface layer of the single fiber via a surfactant. Polyester tow for torn spinning, characterized by having 2. The average particle diameter of the inorganic fine particles is 1 mμ to 200 mμ.
2. The polyester tow for towing spinning according to claim 1, wherein 3. The polyester tow for sawing and spinning according to claim 1 or 2, wherein the inorganic fine particles are silica. 4. The polyester tow for saw-tooth spinning according to claim 1, wherein the single fiber fineness is 2.5 denier or less.