JPH05125665A - Deodorizing fiber and its production - Google Patents

Abstract

PURPOSE:To obtain a deodorizing fiber capable of exhibiting large deodorizing effect using a small amount of deodorizing substance by coating the surface of a polyolefin fiber having a number of pores and the inside of the pores with a deodorizing substance. CONSTITUTION:A polyolefin resin such as polyethylene or polypropylene is mixed with paraffin wax and subjected to melt spinning, drawing and heat treatment and then the paraffin wax is removed with a hydrocarbon based solvent such as hexane to afford a porous fiber and the obtained porous fiber is dipped in an alcohol solution of deodorizing substance such as extract of Quercus stenophylla Makino or extract of Chelonopsis moschata Miq. and dried. Thereby the deodorizing agent is applied to the outer surface of the porous fiber and inner surface of pores to provide the objective deodorizing fiber having large deodorizing effect.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a fiber for adsorbing and deodorizing malodorous components diffused in the air and a method for producing the same.

[0002]

2. Description of the Related Art Conventionally, many processing methods have been proposed for imparting a deodorizing function to textile products. Typical processing methods of this kind are, for example, zeolite, activated carbon,
The surface of a synthetic material manufactured by a normal manufacturing method, or fibers in which a porous material having adsorption performance such as silica gel and a synthetic resin raw material are mixed and melt-spun, and then stretched to dispose the porous material on the fiber surface. Fibers and the like, which are coated with a deodorant substance such as a porous substance, are known. However, the technical problems described below have been pointed out for these deodorant fibers.

[0003]

That is, in the method for producing a deodorant fiber in which the above-mentioned porous substance is mixed, in order to improve the deodorant performance of the fiber, the amount of the porous substance added is increased. However, when the amount of the porous substance added is increased in this way, the spinnability and the drawability are lowered in the fiber manufacturing process, and as a result, only fibers having a relatively large diameter are obtained.
Since the porous substance buried inside does not contribute much to the improvement of the deodorizing performance, only fibers having a low deodorizing performance can be obtained for the added amount.

On the other hand, in the method of coating the surface of the synthetic resin fiber with the deodorant substance, since the surface area of the fiber is limited, it is not possible to expect the deodorant performance to be improved beyond a certain level. There is also a problem that the substances are dropped off and the deodorizing performance is lowered. The present invention has been made in view of such conventional problems, and an object thereof is to provide a deodorant fiber and a method for producing the deodorant fiber, which are capable of obtaining a large deodorant performance even with a relatively thin fiber. To provide.

[0005]

In order to achieve the above object, the deodorant fiber of the present invention comprises a fiber body composed of a polyolefin resin, a mixture of the polyolefin resin and paraffin wax, melt spinning, and stretching. It is characterized by comprising a large number of pores formed by removing the paraffin wax after heat treatment, and a deodorant substance attached to the surface of the fiber body and the inner surface of the pores.

As a method for producing the deodorant fiber, a predetermined amount of a polyolefin resin and paraffin wax are mixed under melting, and this mixture is melt-spun under a predetermined draft ratio to obtain an unstretched fiber. The step of drawing the unstretched fiber under heating at a predetermined ratio and subjecting to heat treatment, and then removing the paraffin wax to obtain a porous fiber, and attaching a deodorant substance to the obtained porous fiber And a step of performing.

Polyethylene and polypropylene are preferable as the polyolefin resin usable in the present invention.
In the case of polyethylene, high density polyethylene having a melt index (MI) of 0.3 to 20 g / 10 min is recommended. Further, as polypropylene, the density is about 0.
90 or more, and the melt flow rate (MFR) value by the measuring method according to ASTM D1238 is
The range of 0.5 to 9.0 g / 10 minutes is preferable.

If the MI or MFR is out of the above range, the melt viscosity at the time of melt spinning after mixing with paraffin wax becomes unsuitable, causing a problem during spinning.
The paraffin wax used in the present invention is mainly composed of a saturated aliphatic hydrocarbon compound and preferably has a melting point of about 50 to 70 ° C. from the viewpoint of easy elution with a solvent.

Suitable results can be obtained by melting and mixing the above-mentioned polyolefin resin and paraffin wax at a ratio of 30 to 300 parts by weight of paraffin wax with respect to 100 parts by weight of the polyolefin resin to prepare a raw material for melt spinning. .. The melt spinning temperature is determined according to the melt viscosity of the mixed raw material. The melt spinning machine preferably uses a screw type extruder in order to promote mixing and kneading of the polyolefin resin and the paraffin wax. It is desirable that the draft during melt spinning, that is, the ratio of the winding speed of the undrawn fiber to the linear velocity of the discharge from the spinning nozzle is 400 or less.

If the draft exceeds 400, the size of the polypropylene crystal becomes small, and the pore diameter of the finally obtained porous fiber becomes too small, resulting in a low porosity. The unstretched fibers obtained under the above conditions are subsequently stretched. The stretching conditions are strain rate in the range of 60 to 120 ° C., that is, the supply roller speed is GF (m / min) and the stretching side roller speed is GT (m / min), when the distance between these rollers is L (m), the value defined by the following formula is 400%
The following is desirable.

Strain rate (% / min) = (GT −GF) / L × 100 When the strain rate exceeds 400% / min, the pore diameter of the obtained porous fiber becomes non-uniform and the crushed locations of the pores are considerably large. Occur. When the stretching temperature is out of the above range, that is, 6
If the temperature is lower than 0 ° C., the film is cold-stretched and the shrinkage ratio after extraction of the paraffin wax is large and the porosity is reduced. Also, 12
If the temperature exceeds 0 ° C, the unstretched fibers are too soft, and effective stretching cannot be performed, resulting in low fiber strength. The draw ratio is 1.4
It is preferable to set the range to 4.5 times. If the stretching ratio is less than 1.4 times, the porosity becomes low, and if it exceeds 4.5 times, the pores are collapsed by the stretching.

A heat treatment is carried out subsequent to the above-mentioned drawing, and this heat treatment prevents the fibers from shrinking in the radial and axial directions to substantially reduce the porosity after the paraffin wax is extracted with a solvent. The heat treatment temperature is preferably around the drawing temperature or higher. Extraction of paraffin wax is preferably performed with a hydrocarbon solvent such as hexane or heptane from the viewpoint of handling and low toxicity.

[0013]

In the method for producing a deodorant fiber of the present invention, a polyolefin resin and paraffin wax are melt-mixed in a ratio within a predetermined range, and the undrawn fiber spun at a predetermined draft ratio is subjected to a predetermined drawing condition. After stretching and heat treatment, the paraffin wax is extracted and removed.

The unstretched fiber is in a state of being filled with a layer of paraffin wax between crystals of a polyolefin resin (polyethylene, polypropylene). In the drawn fiber obtained by hot drawing of the undrawn fiber, the spaces between the crystals are expanded, and when the paraffin wax is extracted after the heat treatment of the drawn fiber, many relatively large pores are formed between the expanded crystals. Therefore, the obtained porous fiber has a very special structure due to its manufacturing method.

That is, the lamellae are transformed into zigzags by hot drawing, and the layer of paraffin wax formed between these crystals is then extracted and removed, so that the pores repeatedly widen and narrow in the fiber cross section. However, it forms pores that are continuous from the surface to the inside, as if they were pores of a hechima. Therefore, a fiber having a high porosity and a large specific surface area can be obtained.

When the deodorant substance is attached to the porous fiber having such a form, the deodorant substance spreads thinly on the surface of the fiber body and the inner surface of the pores, and a large deodorant effect can be obtained even with a small amount of the deodorant substance. ..

[0017]

EXAMPLES Examples of the present invention will be described below.
The invention is not limited to these examples.
The methods for measuring the physical properties shown in the examples will be shown in advance.

Porosity The porosity was calculated by the following equation using the diameter denier (D1) calculated from the fiber diameter and the weight denier (D2) calculated from the weight. D1 = fiber cross-sectional area (cm ² ) × 9 × 10 ⁵ cm × density (g / cm ³ ) D2 = weight of fiber of 9000 m Porosity (%) = (diameter denier−weight denier) / diameter denier × 100 ratio Surface area: Measured by the nitrogen gas adsorption method specified in JIS Z 8830.

Ammonia and trimethylamine deodorizing performance test Ammonia was added at 1000 ppm in a 300 ml flask.
Trimethylamine was adjusted to a concentration of 30ppm, and fiber 2
g was charged therein and the gas concentration in the flask after a lapse of a predetermined time was measured using a Kitagawa gas detector.

Example 1 100 parts by weight of HDPE (Mitsui Petrochemical Co., Ltd .: Hi-Zex 2200J) having an MI value of 5.5 g / 10 min.
A raw material mechanically mixed with 100 parts by weight of paraffin wax (145 ° paraffin manufactured by Nippon Oil Co., Ltd.) was installed with a nozzle having a screw diameter of 25 mm and 0.40 mmφ × 160 holes and set at 145 ° C. to 180 ° C. And the winding speed V1 is 200 m / m.
In, 10 denier undrawn fiber was obtained at a spinning draft rate of 80.

Twelve multifilaments composed of the unstretched fibers obtained were collected and using a roller stretching machine, the total stretching ratio was 3.0 times and the strain rate was 40% / min in an atmosphere of 110 ° C.
Was stretched and wound up. Subsequently, in a state in which this fiber is wound around a paper tube, it is heat-treated for a fixed length in an oven at 110 ° C. for 1 hour, further mechanically crimped to give 15 crimps / inch, and cut into 51 mm. After forming staple fibers, these were immersed in hexane at room temperature to extract paraffin wax.

The resulting porous fiber was solid, had a porosity of 45%, a specific surface area of 39 m ² / g, a weight denier of 2.3 denier, and a pore diameter of the fiber surface of 0. 5
Was about 1 μm.

2 g of the polyethylene-based porous fiber thus obtained was hydrophilized with 200 ml of ethanol, and then used as a deodorant substance, an extract of beech plants, Vladimir oak extract (manufactured by Taiyo Koryo Co., Ltd .: trade name Oaklin E).
50) containing 200 ml of a 1.5% ethanol solution of X)
Add to 0 ml beaker, leave it for 3 minutes, spin-dry for 3 minutes, and put it in an oven set at 55 ° C for 1 minute.
After drying for a period of time, a porous polyethylene-based deodorant fiber was obtained, in which the outer surface of the porous fiber and the inner surface of the pores were coated with V. perilla extract.

The deodorant fiber thus obtained had an adhering amount of V. occidentalis extract of 0.7%. FIG. 1 shows the test results of the deodorizing performance of the obtained deodorant fiber.

Example 2 100 parts by weight of polypropylene (YK121 manufactured by Ube Industries, Ltd.) having a MFR value of 3 g / 10 min and paraffin wax (145 ° paraffin manufactured by Nippon Oil Co., Ltd.) 10
The raw material mechanically mixed with 0 parts by weight was supplied to a melt spinning machine set at 170 ° C to 200 ° C with a screw diameter of 25 mm, a nozzle of 0.4 mmφ x 160 holes attached, and a winding speed V1. An undrawn fiber having a spinning draft of 80 and a denier of 10 denier was obtained at 200 m / min.

The obtained unstretched fiber was stretched and wound using a roller stretching machine in an atmosphere of 110 ° C. under the conditions of a strain rate of 40% / min and a stretching ratio of 2.9 times. Continue to roll the fiber around a paper tube in an oven at 130 ° C for 1
15 pieces /
After the crimp of inch was applied and the staple fiber was cut into 51 mm, it was immersed in hexane at room temperature to extract the paraffin wax.

The resulting porous fiber was solid and had a porosity of 26%, a specific surface area of 55 m ² / g and a weight denier of 2.9 denier.

2 g of the polypropylene-based porous fiber thus obtained was hydrophilized with 200 ml of ethanol, and then used as a deodorant substance, an extract of beech family plants, Vladivore oak extract (trade name: Oaklin E, manufactured by Taiyo Koryo Co., Ltd.).
50) containing 200 ml of a 1.0% ethanol solution of X)
Add to 0 ml beaker, leave it for 3 minutes, spin-dry for 3 minutes, and put it in an oven set at 55 ° C for 1 minute.
After drying for a period of time, a porous polypropylene deodorant fiber was obtained, in which the outer surface of the porous fiber and the inner surface of the pores were coated with Vladimir vulgaris extract.

The deodorant fiber thus obtained had an adhering amount of V. persicae extract of 0.4%. FIG. 1 shows the test results of the deodorizing performance of the obtained deodorant fiber.

Example 3 To the polyethylene-based porous fiber obtained by the same method as in Example 1, was adsorbed V. lacunae extract by the same method as described above, and the adhesion amount at this time was adjusted to 0.4%. A deodorant fiber was obtained. The deodorizing performance of this deodorant fiber is also shown in FIG.

COMPARATIVE EXAMPLE 1 A velvet extract was adhered to a 2 denier ordinary polypropylene fiber having a substantially smooth surface by the same method as in the above-mentioned example. The adhering Vladimir beet extract was 0.7% as in Example 1. The deodorizing performance of this deodorant fiber is also shown in FIG.

As is clear from the results of the deodorizing performance test shown in FIG. 1, the deodorant fiber according to the present invention can remove malodorous substances in a short time. The reason for this is
The pores of the porous fiber of the present invention form pores that are continuous from the surface to the inside in a form like pores of Hemima while repeating widening and narrowing in the fiber cross section, and thus voids. The rate is high and the specific surface area is also large.

When the deodorant substance is attached to the porous fiber having such a form, the deodorant substance spreads thinly on the surface of the fiber body and the inner surfaces of the pores. However, in the fiber shown in the comparative example,
Even if the same amount of deodorant substance is attached, the surface area is limited, so the deodorant substance attaches considerably thickly, and the deodorant substance on the internal side does not function effectively in the initial deodorant performance, so it does not The substance removal performance is inferior.

On the other hand, in the deodorant fiber of the present invention, since the deodorant substance is widely adhered in the form of a thin film, it is considered that a large deodorant effect can be obtained even with a small amount of the deodorant substance.

[0035] In the above-mentioned examples, Vladimir oupti extract was exemplified as the deodorant substance, but the practice of the present invention is not limited to this, and for example, plant extract oil such as musk root extract can also be applied. In addition, in applications where high deodorizing performance is not required, a deodorizing effect can be obtained even with a surfactant used as a fiber surface treatment agent. further,
The deodorant substance attached to the deodorant fiber of the present invention is practically in the range of 0.1 to 10 parts by weight based on the fiber.

[0036]

As described in detail above, according to the deodorant fiber of the present invention, it is considered that a large amount of deodorant effect can be obtained even with a small amount of deodorant substance, and the deodorant substance is attached. Porous fibers can also be produced by conventional spinning machines.

[Brief description of drawings]

FIG. 1 is a table showing physical property values and results of a deodorizing performance test of Examples and Comparative Examples of the present invention.

Continuation of front page (51) Int.Cl. ⁵ Identification number Office reference number FI technical display location C08L 91/00 7415-4J D06M 13/02 // D01F 6/04 B 7199-3B

Claims (2)

[Claims] 1. A fiber main body made of a polyolefin resin, and a large number of pores formed by mixing the polyolefin resin and paraffin wax, melt-spinning, and stretching and heat treatment to remove the paraffin wax. A deodorant fiber, comprising a deodorant substance attached to the surface of the fiber body and the inner surface of the pores. 2. A predetermined amount of a polyolefin resin and paraffin wax are mixed under melting, and the mixture is melt-spun at a predetermined draft rate to obtain an unstretched fiber, which is then heated. It is characterized in that it comprises a step of obtaining a porous fiber by removing the paraffin wax after being drawn at a predetermined ratio and subjected to a heat treatment, and a step of attaching a deodorant substance to the obtained porous fiber. Method for producing deodorant fiber.