JP2001098412A - Deodorizing viscose rayon fiber and production of the same - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide deodorizing viscose rayon fibers having excellent deodorant effect. SOLUTION: The objective deodorizing rayon fibers comprises the matrix of viscose rayon and the deodorant component of very fine particles of a charcoal prepared by crushing a charcoal made in Binchou area (Japan) in the matrix. This-s deodorant viscose fiber can be produced by admixing an aqueous dispersion of the fine particle charcoal to a rayon viscose, then the mixture is spun. In a preferred embodiment, the fine particles of Bincho charcoal comprises >=95% of the particles with the particle size of <=1.0 μm. Further, the content of the fine particle charcoal is preferably 1-40 wt.%. The fine particles of the Bincho charcoal prepared by crushing has no surface-smooth spherical shape but amorphous form having uneven and roughened surfaces. Accordingly, even when the particles are buried in the viscose matrix, the projecting surfaces of the particles tend to be exposed on the surface of the viscose rayon, thus the exposed.charcoal particles absorb the odorous gas to manifest good deodorant performance.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a rayon fiber having excellent deodorizing performance and a method for producing the same.

[0002]

2. Description of the Related Art Conventionally, rayon fibers used as futon cotton and rayon fibers for clothing have been provided with deodorizing performance. This is to prevent an unusual odor from being generated on the futon or the clothes. Also, rayon fibers used for carpets, wall coverings and the like are given deodorizing performance. This is to prevent the generation of an unusual odor in a carpet or the like, and also to adsorb the unusual odor in the room to the carpet or the like to prevent the odor in the room.

[0003] As such a deodorant rayon fiber, a rayon fiber matrix containing activated carbon fine particles having a metal complex of phthalocyanine adsorbed therein is known (Japanese Patent Application Laid-Open No. 63-300679). The deodorant rayon fiber converts odor molecules into odorless molecules (odorless components) by chemically reacting a phthalocyanine metal complex adsorbed on activated carbon fine particles with odor molecules. Therefore, the activated carbon fine particles are used only for supporting the metal complex of phthalocyanine, and are not used for adsorbing odor molecules. This is because, if activated carbon fine particles are contained in the rayon fiber matrix, the fine pores of the activated carbon fine particles are covered with cellulose, and the ability to adsorb odor molecules is almost lost. That is, conventionally, a deodorant of the type that adsorbs odor molecules in the micropores (typically activated carbon)
It has been common technical knowledge that when embedded (contained) in a rayon fiber matrix, the deodorant function is lost and the rayon fiber cannot be provided with the deodorant function.

[0004]

However, even if the deodorant is of the type that allows odor molecules to be adsorbed into the micropores, the specific deodorant cannot be removed even if it is embedded in the rayon fiber matrix. It has been found that the odor function is hardly lost. Unexpectedly, for certain odor components, the deodorizing function is improved compared to using only a specific deodorant, and negative ions are generated when placed in a specific state (It is said that the more negative ions, the better the environment for the human body.) The present invention
It has been made based on such a discovery.

[0005]

That is, the present invention relates to a deodorant rayon fiber characterized in that a large number of bincho charcoal fine particles obtained by pulverizing bincho charcoal are embedded in a base of rayon fiber. Things. In addition, as the rayon fiber, viscose rayon fiber is generally used,
Cupra rayon fiber or acetate rayon fiber may be used.

The present invention is most characterized in that Bincho charcoal fine particles obtained by pulverizing Bincho charcoal are used as a deodorant to be embedded in a rayon fiber matrix. It is considered that the reason why the use of the Bincho charcoal fine particles does not cause the deodorizing function to be easily reduced even when embedded in the rayon fiber matrix is as follows. Bincho charcoal is white charcoal baked Ubamegashi,
Compared to activated carbon and black charcoal, it has the characteristic of being hard. Its hardness is higher than that of steel and cannot be cut with a saw, and the blade of the saw is spilled when trying to cut. Therefore, when such a hard Bincho charcoal is pulverized into fine particles by using a hammer mill, a ball mill, or the like to give impact, friction, or the like, the surface does not necessarily have a smooth spherical shape but an irregular shape having irregularities. When a large number of such Bincho charcoal fine particles are embedded in a rayon fiber matrix, FIG.
(It is a schematic diagram showing a cross section of a deodorant rayon fiber.)
As shown in (1), there are a number of locations a where the projections on the surface of the fine particles are in contact with the surface of the rayon fiber. At this point a, the protrusions of the bincho charcoal fine particles may be exposed to the outside. If the rayon fiber surface is not exposed to the outside but is rubbed, the rayon fiber surface may be damaged, and as a result, the projections of the bincho charcoal fine particles may be exposed to the outside. Therefore, it is considered that the odor component is taken into the Bincho charcoal fine particles by the exposed portion, and the deodorizing function is exhibited. This is considered to be the reason why the deodorizing function of the rayon fiber in which a large number of Bincho charcoal fine particles are embedded in the base material is not easily reduced.

[0007] The deodorant rayon fiber according to the present invention is generally produced as follows. First, Bincho charcoal is prepared and crushed to obtain a large number of Bincho charcoal fine particles. As a pulverizing method, any conventionally known pulverizing method can be used. As a preferable pulverization method, a two-stage pulverization method in which fine pulverization is performed after coarse pulverization is preferable. In particular, a two-stage pulverization method in which coarse pulverization is performed by dry pulverization and fine pulverization is performed by wet pulverization is most preferable. As the pulverizer, any conventionally known pulverizer can be used, but it is preferable to use a hammer mill or a roll crusher for coarse pulverization, and it is preferable to use a ball mill or a tower type pulverizer for fine pulverization.

[0008] The particle size of the Bincho charcoal fine particles is arbitrary as long as it can be embedded in the rayon fiber matrix, but preferably, 95% or more of a large number of Bincho charcoal fine particles have a particle size of 1.0 µm. It is better to be less than. Particle size 1.0 μm
If the content is less than 95%, the addition of viscose with Bincho charcoal fine particles may increase the viscosity of the viscose and cause gelation. The particle size distribution of Bincho charcoal fine particles may be measured using a call counter or the like. The obtained many Bincho charcoal fine particles are dispersed in water to form an aqueous dispersion. In order to disperse Bincho charcoal fine particles in water, a suitable dispersant such as a surfactant may or may not be used. Further, when Bincho charcoal fine particles are wet-pulverized using water (which may contain a dispersant such as a surfactant) in order to obtain fine particles of the coal, the water dispersion is used as it is. You may use it. The proportion of Bincho charcoal fine particles in the aqueous dispersion is preferably from 5 to 80% by weight.
If the content is less than 5% by weight, the number of Bincho charcoal fine particles embedded in the rayon fiber matrix tends to decrease. Also,
If it exceeds 80% by weight, it tends to be difficult to obtain an aqueous dispersion in which Bincho charcoal fine particles are dispersed stably.

On the other hand, the viscose to which the aqueous dispersion is added and mixed may be any of those conventionally used for producing viscose rayon fibers. Specifically, viscose having a cellulose content of about 7 to 10% and containing about 50 to 80% of alkali such as caustic soda with respect to cellulose may be used. The viscose may optionally contain various additives such as various metal salts and antistatic agents. Viscose may be added and mixed with an aqueous dispersion in which a large number of Bincho charcoal fine particles are dispersed, as long as it is before spinning viscose, but it is most preferable to add and mix immediately before spinning. . If a long time elapses after the addition and mixing, the Bincho charcoal fine particles tend to agglomerate or settle, making it difficult to maintain a uniform mixed state. As the addition method, any conventionally known method can be employed, but it is preferable to add the aqueous dispersion quantitatively and continuously to the viscose by an injection pump.

The amount of the bincho charcoal fine particles added to the viscose is optional, but generally it is preferably 1 to 40% by weight based on the weight of the cellulose in the viscose.
More preferably, it is 20% by weight. If the addition amount of the Bincho charcoal fine particles is less than 1% by weight, the number of the Bincho charcoal fine particles embedded in the rayon fiber matrix becomes small, and there is a possibility that a sufficient deodorizing function may not be exhibited. On the other hand, when the addition amount of Bincho charcoal fine particles exceeds 40% by weight, the spinnability is reduced, the Bincho charcoal fine particles are easily dropped from the obtained deodorant rayon fiber, or the strength and strength of the deodorant rayon fiber are reduced. The physical properties such as elongation tend to decrease.

An aqueous dispersion in which a large number of Bincho charcoal fine particles are dispersed is added to viscose and mixed, and then spun in the same manner as in the production of rayon fibers. Specifically, viscose may be extruded from a spinning nozzle into a coagulating liquid (liquid temperature of about 40 to 50 ° C.). The coagulating liquid is sulfuric acid 80-120.
g / l and 50 to 360 g / l of sodium sulfate. The viscose extruded into the coagulation liquid becomes regenerated cellulose and coagulates, and is then subjected to stretching as required, thereby obtaining rayon fibers. In the present invention, since bincho charcoal fine particles are added and mixed in viscose, the deodorizing rayon fiber in a state in which a large number of bincho charcoal fine particles are embedded in the rayon fiber matrix is obtained by this method. It is.

The deodorant rayon fiber obtained as described above may be used as a long fiber, or may be cut into a desired fiber length and used as a short fiber. If a yarn is spun using such a deodorant rayon fiber to obtain a yarn, the yarn becomes a deodorant yarn. In addition, if yarns are not obtained and deodorant rayon fibers are accumulated, a deodorant futon cotton can be obtained, or a nonwoven fabric can be obtained by bonding deodorant rayon fibers to each other by any means. And a deodorant nonwoven fabric. Further, if the deodorant yarn is knitted or woven, it becomes a deodorant knitted fabric. The deodorant nonwoven fabric and the deodorant knitted fabric can be suitably used for conventionally known applications, for example, as a material for clothing. Also, bed sheets, pillowcases, blankets, carpets, wall coverings, plush fabrics,
Materials such as curtains, quilts, cushion covers, and car linings can also be suitably used.

[0013]

Hereinafter, the present invention will be described based on examples, but the present invention is not limited to the examples. The present invention should be construed as based on the finding that Bincho charcoal fine particles do not lose much of their deodorizing function when embedded in a rayon fiber matrix.

Example 94.5% of fixed carbon, apparent specific gravity 1.92 g / cm ²
After dry grinding of Bincho charcoal, further wet grinding process is performed,
Water dispersion of Bincho charcoal fine particles (weight ratio of Bincho charcoal fine particles is 2
0% by weight). 95% or more of the Bincho charcoal fine particles have a particle diameter of less than 1.0 μm, and a number average particle diameter of 0.7.
μm, and the maximum particle size was 2.5 μm.

On the other hand, the raw pulp was immersed in an aqueous solution of caustic soda of about 18%, and compressed and pulverized to obtain alkali cellulose. After aging, carbon disulfide was reacted to obtain cellulose xanthate, which was then dissolved in a diluted aqueous solution of sodium hydroxide to prepare viscose. This viscose,
Cellulose content 8.8%, alkali content 5.9%
And the viscosity was 50 seconds (falling ball type).

The aqueous dispersion described above was quantitatively and continuously added to the viscose immediately before spinning by an injection pump and mixed uniformly. At this time, the addition amount of Bincho charcoal fine particles, the weight of cellulose in viscose,
The content was adjusted to 10% by weight. After that, viscose containing Bincho charcoal fine particles was supplied with a nozzle diameter of 0.06 mm and a number of holes of 10,0.
From the spinneret No. 00 at a spinning speed of 68 m / min.
It was spun in a regeneration bath. The coagulation / regeneration bath uses 110 g of sulfuric acid /
1, 350 g / l of sodium sulfate, and 15 g / l of zinc sulfate, and the liquid temperature was 45 ° C. After spinning, it was drawn by a conventional two-bath tension spinning method, then cut, and the fineness was adjusted to 1.
Deodorant rayon short fibers having a fiber length of 51 mm and a denier of 5 were obtained.

This deodorant rayon staple fiber has a content of Bincho charcoal fine particles of 10.2% by weight and a dry strength of 1.98.
In g / d, the dry elongation was 19.8%. That is, the viscose rayon staple fiber had almost the same strength and elongation as the ordinary viscose rayon staple fiber, and there was no problem in practical use.

[Deodorization Test 1] 30 g of the deodorant rayon staple fiber obtained in the example was placed in a 5-liter tetrabag, and the test gas (ammonia, trimethylamine, hydrogen sulfide) was adjusted to an initial concentration of 30 ppm. After the injection, the residual gas concentration was measured with time using a Kitagawa detector tube. The results are shown in Table 1.

[Deodorizing Test 2] The deodorant rayon staple fiber obtained in the Examples was subjected to a JIS L-0844-A2 method for 10
After washing twice, the residual gas concentration was measured in the same manner as in the deodorizing test 1. The results are shown in Table 1.

[Deodorizing Comparative Test] Deodorant rayon short fiber 3
Instead of using 0g, use 50g of unground charcoal charcoal,
The residual gas concentration was measured in the same manner as in the deodorization test 1. The results are shown in Table 1.

[Deodorant blank test] The residual gas concentration was measured in the same manner as in the deodorant test 1 except that no deodorant rayon short fiber was used. The results are shown in Table 1.

[0022]

[Table 1] Note that, in Table 1, a portion indicated by "-" means that the residual gas could not be detected.

As is clear from the results shown in Table 1, the deodorant rayon staple fibers according to the examples adsorb satisfactorily any of ammonia, trimethylamine and hydrogen sulfide, which are representative of odor gases, and remove odors. It turns out that it is possible. In particular, it can be seen that the adsorption of ammonia and trimethylamine to the deodorant rayon staple fiber according to the example occurs more quickly than that of bincho charcoal alone. Therefore, when the deodorant rayon staple fiber according to the example is used, an unexpected effect that the deodorizing performance is superior to that of the bincho charcoal alone is exhibited.

[Negative ion measurement test] Measuring equipment (ION TESTER KST-900) manufactured by Kobe Denpasha
), The number of negative ions generated in the deodorant rayon staple fiber obtained in the example was measured. The measuring method is as follows. A deodorant rayon staple fiber is attached to a measuring instrument, and a weak friction is applied to the rayon staple fiber after 35 seconds.
After 0 seconds, strong friction was applied, and then the strong friction was stopped. The result was as shown in FIG. That is, when no friction is applied, the number of generated negative ions is 100 / c.
c, but less than about 270 with low friction
Parts / cc and about 500 parts / cc due to strong friction.
In general, there are almost no negative ions in the crowds in urban areas, about 350 cells / cc in well-ventilated places, and 7 in forests.
It is said that the number is more than 00 / cc, and it is said that the more negative ions, the more favorable environment for the human body. Therefore, if the deodorant rayon staple fiber according to the example is used for frictional use (for example, for clothing, futon cotton, bed sheets, and pillowcases), a large amount of negative ions are generated, and a favorable environment for the human body is obtained. It is considered possible.

[0025]

The deodorant rayon fiber according to the present invention, in which the Bincho charcoal fine particles are embedded in the matrix, has extremely excellent deodorant performance as demonstrated in the examples. Moreover, it has better deodorizing performance than that of Bincho charcoal alone. Although this effect is not clear, the surface of the Bincho charcoal fine particles embedded in the base of the rayon fiber has irregularities, so that it is easily exposed to the surface of the rayon fiber, and the Bincho char is crushed into fine particles. Therefore, it is considered that the specific surface area is extremely large. Therefore,
When the deodorant rayon fiber according to the present invention is used as futon cotton, bed sheet, pillow cover, material for clothing, or the like, it is possible to remove an unpleasant odor and to obtain a comfortable living environment. In addition, since both rayon fiber and Bincho charcoal fine particles have little adverse effect on the human body, the above-mentioned effects can be further promoted.

Since the deodorant rayon fiber according to the present invention contains Bincho charcoal fine particles, depending on the method of use, the effect of Bincho charcoal, that is, the negative ion effect, and the chemicals that cause sick house syndrome may be caused. Adsorption of substances,
It can also exhibit an electromagnetic wave shielding effect, a heating effect by far-infrared rays, a conditioning effect, and the like.

[Brief description of the drawings]

FIG. 1 is a diagram schematically showing a cross section of a deodorant rayon fiber according to an example of the present invention.

FIG. 2 is a graph showing the transition of the number of generated negative ions when the deodorant rayon staple fiber according to the example was subjected to a negative ion measurement test.

Continuation of the front page (72) Inventor Ryo Shimizu 1-72-1309, Tomobuchi-cho, Miyakojima-ku, Osaka-shi, Osaka (72) Inventor Seiichi Nishijima 141-3 Kisato, Nammachi, Hidaka-gun, Wakayama F-term ( Reference) 4C080 AA05 BB02 CC12 HH05 JJ05 JJ09 KK08 LL10 MM05 NN24 QQ03 4L035 BB03 BB06 BB08 BB16 DD19 EE08 EE12 EE20 FF01 FF04 JJ03 KK01 KK05

Claims (4)

[Claims] 1. A deodorant rayon fiber characterized in that a large number of bincho charcoal fine particles obtained by pulverizing bincho charcoal are embedded in a base of rayon fiber. 2. A method for producing a deodorant rayon fiber, comprising adding and mixing an aqueous dispersion in which a large number of Bincho charcoal fine particles are dispersed to viscose, followed by spinning. 3. The method for producing deodorant rayon fiber according to claim 2, wherein 95% or more of a large number of Bincho charcoal fine particles have a particle size of less than 1.0 μm. 4. The method for producing deodorant rayon fiber according to claim 2, wherein the addition and mixing amount of the Bincho charcoal fine particles is 1 to 40% by weight based on the weight of the cellulose in the viscose.