JPH06200415A - Deodorizing polyester fiber - Google Patents

Abstract

PURPOSE:To obtain a polyester fiber having excellent durability and high deodorizing performance even to odor caused by acidic substance. CONSTITUTION:This deodorizing fiber contains zinc oxide and has a number of fine pores. The fiber can be produced by the alkali-thinning treatment of a polyester fiber containing zinc oxide. The fiber may contain aluminum dihydrogen tripolyphosphate as an arbitrary component.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a polyester fiber having excellent durability and good deodorant property, and a method for producing the same.

[0002]

2. Description of the Related Art Polyester fibers typified by polyethylene terephthalate are widely used for clothing, bedding, etc. because of their excellent mechanical properties, chemical resistance, and texture. There is.

In recent years, there has been a demand for deodorant polyester fibers having durability and recoverability by washing or dyeing. As a method for producing the deodorant polyester fiber, a method in which a deodorant is applied to the surface of the fiber by a post-processing method can be considered, but this does not provide sufficient durability.

Therefore, a method of adding a deodorant to a molten polyester immediately before spinning and kneading and dispersing is disclosed in, for example, Japanese Patent Laid-Open No. Sho 63.
-295711 publication. The deodorants used in these methods are activated carbon, ferrous sulfate, condensed zirconium phosphate, aluminum phosphate and the like.
However, the deodorant performance of the polyester obtained by these methods is not sufficient.

The invention described in JP-A-3-124809 discloses that a polyester polymer is kneaded with aluminum dihydrogen tripolyphosphate and is provided with a large number of fine pores.
Achieved improvement of deodorant property. However, the polyester fiber cannot remove the odor caused by an acidic substance such as hydrogen sulfide or methyl mercaptan.

[0006]

Means for Solving the Problems The present inventor has made it possible to remove odor caused by acidic substances such as hydrogen sulfide and methyl mercaptan by adding zinc oxide to polyester fiber and providing a large number of fine pores. It has been found that a polyester fiber having good durability and good deodorant properties can be obtained.

That is, the present invention is a deodorant polyester fiber characterized by containing zinc oxide and having a large number of fine pores. The polyester fibers preferably contain about 0.1 to 5.0 parts by weight, especially about 1.5 to 3.0 parts by weight of zinc oxide, per 100 parts by weight of polyester. In addition, aluminum dihydrogen tripolyphosphate may be included, preferably in an amount of about 0.1 to 5.0 parts by weight, especially about 1.5 to 3.0 parts by weight. These polyester fibers are produced by adding zinc oxide and optionally aluminum dihydrogen tripolyphosphate to a polyester polymer, and subjecting it to alkali weight reduction processing to reduce the weight.

The constituent features of the present invention will be described in detail below.

The polyester in the present invention includes all known polyesters. Preferred polyesters include, but are not limited to, polyethylene terephthalate. Examples of dicarboxylic acids other than terephthalic acid include aromatic dicarboxylic acids such as isophthalic acid and naphthalenedicarboxylic acid, and aliphatic dicarboxylic acids such as oxalic acid, succinic acid, glutaric acid, adipic acid, azelaic acid and sebacic acid. Examples of glycols other than ethylene glycol include diethylene glycol, triethylene glycol, polyethylene glycol, propylene glycol, polypropylene glycol, tetramethylene glycol, pentamethylene glycol, neopentyl glycol, and hexamethylene glycols. Either or both of the dicarboxylic acid component and the glycol component may be composed of two or more kinds. It is also possible to use two or more polyesters. Preferably, about 85% by weight or more of polyethylene terephthalate is used.

The zinc oxide used in the present invention is also not particularly limited. However, in order to prevent the spinnability of polyester from deteriorating, the average particle diameter of zinc oxide is not more than about 5 μm, especially about 2 μm.
It is preferably m or less. Zinc oxide is polyester
The amount is preferably about 0.1 to 5.0 parts by weight, and particularly preferably about 1.5 to 3.0 parts by weight, based on 100 parts by weight. If the amount of zinc oxide is less than about 0.1 parts by weight, the deodorizing effect is insufficient,
If the amount exceeds about 5.0 parts by weight, problems such as difficulty in fiberizing or deterioration of physical properties of the fiber occur.

There is no particular limitation on the method of incorporating zinc oxide into the polyester. For example, a method of mixing zinc oxide in a molten polyester polymer, a method of mixing zinc oxide in a raw material monomer or oligomer and then polymerizing,
Various known methods such as a method of mixing in the polymerization step and a master pellet method can be mentioned. Zinc oxide may be mixed at any stage before spinning. It is also possible to use a dispersion medium, for example liquid polyester, in the mixing. To exemplify a preferable production method, a slurry is prepared from a liquid polyester dispersion medium and fine powder zinc oxide, and this is rapidly kneaded with a polyester polymer immediately before spinning. As a result, it is possible to prevent deterioration of physical properties due to heat history and adsorption of deteriorated products. The temperature, pressure, mixing speed, etc. during kneading can be easily determined by those skilled in the art and need not be described here. For determining the kneading conditions, reference can be made to JP-A-4-91222.

The liquid polyester used as the dispersion medium is
Hydroxyl value is about 25mgKOH / g or less, especially about 20mgKOH / g
Those below g are preferred. Hydroxyl value is about 25mgKOH / g
If it is higher, the thermal stability of the polyester is lowered when it is mixed and dispersed in the polyester together with zinc oxide and melt-molded, and manufacturing troubles such as spinning yarn breakage and discoloration may occur. Examples of these liquid polyesters include aliphatic dicarboxylic acids such as adipic acid, sebacic acid, azelaic acid or glutaric acid, and glycols such as ethylene glycol, propylene glycol, 1,3-butanediol, pentyl glycol, hexyl glycol or diethylene glycol, or Examples thereof include those obtained by copolymerizing polyethylene glycol, polypropylene glycol or polyalkylene glycol such as polybutylene glycol, but are not limited thereto. The acid component of the aliphatic polyester is preferably an aliphatic carboxylic acid having 3 to 8 carbon atoms, particularly adipic acid, and the glycol component is preferably ethylene glycol or 1,3-butanediol. At least one end of these polyesters may be blocked with a monohydric alcohol. There is no particular limitation on the monohydric alcohol, propanol, butyl alcohol,
Amyl alcohol and the like can be used, but propanol is particularly preferable. The end blocking can be performed after the polycondensation reaction of the polyester, or can be performed by adding and mixing a monohydric alcohol to the reaction system to cause the polycondensation reaction, but it is easy to add to the reaction system. is there. The liquid polyester used in the present invention has a viscosity at 25 ° C. of about 150.
Poise or less, especially about 100 poise or less, preferably about 700 to 3500, more preferably 10
It has a number average molecular weight of 00 to 2500.

The zinc oxide mixed polyester as described above is then spun. The spinning method is not particularly limited, and an appropriate method may be selected according to the purpose. However, direct spinning is preferred because of its uniform quality. It is also possible to use chip spinning. It will be easy for a person skilled in the art to select the optimum one from various methods.

The deodorant polyester fiber of the present invention also comprises
It has many fine pores. More preferably, the minor axis is 0.2
-1.0 μm, long diameter 1-5 μm, 1mm fiber surface
About 1 × 10 ^{5 to} 5 × 10 ⁵ pieces per ² , especially about 2 × 10 ⁵ to 4
It has × 10 ⁵ .

In order to give pores to the fibers, the polyester fibers containing zinc oxide may be subjected to alkali weight reduction processing to reduce the weight. Here, the alkali weight loss processing is
It means a treatment in which a polyester fiber is treated with an alkaline aqueous solution. Preferably by this weight reduction processing,
The zinc oxide-containing polyester fiber is reduced by 1 to 15% by weight, particularly 1 to 5% by weight.

Here, the alkaline aqueous solution is not particularly limited, and is an aqueous solution of caustic alkali such as sodium hydroxide or potassium hydroxide, or an aqueous solution of hydroxide of alkaline earth metal such as calcium hydroxide or magnesium hydroxide. Solutions and the like can be used, but are not limited to these. A caustic aqueous solution, especially a sodium hydroxide aqueous solution, is preferably used. The concentration of the alkaline aqueous solution is preferably about 10-70 g / l, especially about 30-40 g / l. The treatment method is arbitrary, and various known methods can be used, but it is easy to immerse in an alkaline aqueous solution. Illustrating a preferable processing method,
Polyester fiber containing zinc oxide, about 60-100
℃, especially about 90 ~ 100 ℃ in an alkaline aqueous solution about 10 ~
Soak for 60 minutes, especially about 20-30 minutes. According to the finding of the present inventor, when the polyester fiber contains zinc oxide, the weight loss rate due to the alkaline aqueous solution is increased. It can be considered that the fibers of the present invention are porous and have a large effective surface area, however, the present invention is not limited to these particular theories.

The deodorant polyester fibers according to the invention also preferably contain aluminum dihydrogen tripolyphosphate as an optional component. This can further improve the deodorizing effect. Aluminum dihydrogen tripolyphosphate is a solid acid that is sparingly soluble in water, chemically adsorbs with alkali or basic substances, and has the ability to exchange ions with various cations, so it is especially suitable for the removal of ammonia and amine malodorous substances. effective. Aluminum dihydrogen tripolyphosphate is represented by AlH ₂ P ₃ O ₁₀ · 2H ₂ O, which has 2H ₂ O as water of crystallization and also has adhering water, so when kneaded into molten polyester as it is. Since water is released by heating, polyester is decomposed and spinning becomes extremely difficult. To prevent it, its water content should be as low as possible, specifically about 1000p.
It is preferable to suppress it to pm or less. As a method for reducing the water content, vacuum drying at about 120 to 150 ° C is preferable. As the aluminum dihydrogen tripolyphosphate, it is preferable to use one having an average particle diameter of about 5 μm or less, particularly about 2 μm or less so that the spinnability of the polyester is not deteriorated. Aluminum dihydrogen tripolyphosphate is about 0.1 to 5.0 parts by weight, especially about 100 parts by weight of polyester.
It is preferable to use 1.5 to 3.0 parts by weight. If the amount is less than about 0.1 part by weight, the deodorizing effect is insufficient, and if the amount exceeds about 5.0 parts by weight, problems such as difficulty in fiberizing or deterioration of physical properties of the fiber occur. Aluminum dihydrogen tripolyphosphate can be mixed with the polyester by the same method as in zinc oxide. The mixing of aluminum dihydrogen tripolyphosphate can be carried out at any stage before spinning, and may be carried out simultaneously with the mixing of zinc oxide or separately.

The deodorant polyester fiber of the present invention may contain a dye, a pigment, an optical brightener, a fire retardant, etc. as an optional component. Furthermore, the deodorant polyester fiber of the present invention may be subjected to post-treatments such as dyeing, water repellent treatment, antistatic treatment and softening treatment. The deodorant polyester fiber of the present invention can also be processed into various fiber structures such as woven fabric, knitted fabric and nonwoven fabric. In that case, it is also possible to mix with other fibers. The method for producing a fiber structure from the fiber of the present invention is not particularly limited, and a fiber structure in any form can be obtained according to various known methods.

The present invention will be further described below with reference to examples, but the present invention is not limited to these examples.

[0020]

【Example】

[0021]

Example 1 Liquid polyester (acid value 0.5, hydroxyl value 5
50 parts by weight of fine powder of zinc oxide [K-Fresh MZO (trademark) manufactured by Teika Co.,
50 parts by weight of average particle size 0.4 to 0.6 μm] was added, the temperature was raised to 80 ° C., and the mixture was kneaded with a three-roll mill to obtain a zinc oxide dispersion.

4 parts by weight of the zinc oxide dispersion was added to 100 parts by weight of polyethylene terephthalate and rapidly kneaded by a static mixer. Then, the yarn was spun and drawn by a conventional method to obtain a single yarn 3d. At this time, the spinnability was good and there was no yarn breakage.

The yarn obtained above was treated with NaO having a concentration of 30 g / l.
After being treated with an aqueous H solution at 90 ° C. for 30 minutes, it was washed with ion-exchanged water and dried at 105 ° C. for 2 hours. An electron micrograph of the yarn thus obtained is shown in FIG.

In order to test the deodorant property, 1 g of the thus obtained thread was put in a 3 liter odor bag, and hydrogen sulfide gas was injected into the bag to make the initial concentration 105 ppm. Then, the concentration of hydrogen sulfide was measured at regular intervals using a detector tube (manufactured by Gastec). The results are shown in Table 1.

[0025]

Comparative Example 1 N obtained as an intermediate product in Example 1
The same test as in Example 1 was performed on the zinc oxide-containing yarn (the electron micrograph is shown in FIG. 2) before the treatment with the aOH aqueous solution. The results are shown in Table 1.

[0026]

Comparative Example 1 Spinning was carried out by the same procedure as in Example 1 except that the zinc oxide dispersion was not mixed (electron micrograph of the intermediate product thus obtained is shown in FIG. 4), and further execution was carried out. The same procedure as in Example 1 was used to treat with an aqueous NaOH solution. An electron micrograph of the yarn thus obtained is shown in FIG.

From these electron micrographs, it can be said that the yarn of Example 1 according to the present invention has a large number of fine pores as compared with the polyester yarn only containing zinc oxide, the ordinary polyester yarn and the alkaline solution treated product thereof. It is clear.

[0028]

Comparative Example 2 A thread was produced in the same manner as in Example 1 except that aluminum dihydrogen tripolyphosphate (average particle size 1 μm, vacuum dried at 150 ° C. for 6 hours) was used instead of zinc oxide. Also in this case, the spinnability was good and there was no yarn breakage. The same test as in Example 1 was performed on the obtained yarn. The results are shown in Table 1.

[0029]

Comparative Example 3 The same test as in Example 1 was carried out on the yarn containing aluminum dihydrogen tripolyphosphate obtained as the intermediate product in Comparative Example 2 before the treatment with the aqueous NaOH solution. The results are shown in Table 1.

[0030]

[Table 1] It is clear from Table 1 above that the deodorant properties of the fibers according to the present invention are remarkably good. Since the deodorant substance of the present invention is kneaded in polyester, the deodorant effect is excellent in durability.

[Brief description of drawings]

FIG. 1 is an electron micrograph of the yarn obtained in Example 1, magnification: 1,000 times.

FIG. 2 NaO obtained as an intermediate product in Example 1.
Electron micrograph of yarn before treatment with H aqueous solution, magnification: 1,0
00 times.

FIG. 3 An electron micrograph of the yarn obtained in Control Example 1, magnification: 1,000 times.

FIG. 4 NaO obtained as an intermediate product in Control Example 2
Electron micrograph of yarn before treatment with H aqueous solution, magnification: 1,0
00 times.

Continuation of the front page (51) Int.Cl. ⁵ Identification code Office reference number FI technical display location D06M 11/38 // D06M 101: 32

Claims (3)

[Claims] 1. A deodorant polyester fiber containing zinc oxide and having a large number of fine pores. 2. The deodorant polyester fiber according to claim 1, further comprising aluminum dihydrogen tripolyphosphate. 3. The method for producing a deodorant polyester fiber according to claim 1, wherein the polyester fiber containing zinc oxide is subjected to alkali weight reduction processing to reduce the weight.