JP2013253327A - Functional rayon fiber and method for producing the same - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a functional rayon fiber having antibacterial properties and deodorant properties more effectively imparted therein while maintaining safety, and to provide a method for producing the same.SOLUTION: The rayon fiber is obtained by adding pulverized tea leaves to the rayon fiber. The method for producing the rayon fiber comprises adding and mixing an aqueous dispersion in which a pulverized material of tea leaves is dispersed, to and with a viscose, and then spinning the viscose.

Description

  The present invention relates to a functional rayon fiber and a method for producing the same. Specifically, the present invention relates to a rayon fiber containing tea leaves having functions such as antibacterial properties and deodorizing properties, and a method for producing the same.

  It is widely known to add antibacterial and other functions to articles that are used in daily-use articles by extracting the extracted water-soluble components of tea such as catechins, especially for hygiene applications. (Patent Document 1). On the other hand, antibacterial properties, deodorizing properties, and UV-cutting properties are imparted to textile products for clothing and interior use (Patent Document 2). Moreover, although antibacterial property and deodorant property are given also to the textiles used for wallpaper etc., it cannot be said that a function is enough.

  The above method using tea ingredients widely used for food for such applications can be expected to have no safety problem. In addition to the method of impregnating or mixing the extract with fibers, In addition, attempts have been made to mix the active ingredients of tea into the molding material when molding fibers and the like, and improvements such as the addition of fatty acids or salts thereof so that the functions of the active ingredients are not lost when molding rayon. The method is also known (Patent Document 3).

JP 2004-187732 A JP-A-63-300769 JP 2010-121229 A

  Although the method using the tea extract component gives a certain effect, its function is not sufficient, and it is desired to develop a fiber having antibacterial and deodorizing properties more effectively while maintaining safety.

  The inventors of the present invention diligently studied a method for solving the above-mentioned problems, and found that a specific tea husk is extremely effective, thereby completing the present invention.

  That is, the present invention is a rayon fiber characterized by containing crushed tea shells inside the rayon fiber.

  The present invention is also a method for producing rayon fiber, characterized in that a dispersion obtained by dispersing ground tea powder in viscose is added and mixed and then spun.

  The rayon fiber of the present invention is extremely excellent in antibacterial properties, and it is extremely efficient compared to components extracted in water or the like by carrying out the method of the present invention that uses tea leaves as the extraction residue. Can provide high-performance rayon fibers and is extremely valuable industrially.

  If the rayon fiber of the present invention is used as a futon cotton, a bed sheet, a pillow cover, a clothing material, etc., the unpleasant odor can be removed to completely kill germs. In addition, since it has antibacterial properties against ringworm, etc., it is also effective against skin diseases such as athlete's foot, and further, it can be expected to repel mites.

  In the present invention, the tea husk refers to a heat-treated tea tree (scientific name Camellia sinensis) leaf, which is an evergreen tree of the camellia family Camellia. May be included. In addition, if it is provided as tea leaves after being subjected to heat treatment, fermentation treatment or semi-fermentation treatment, post-fermentation treatment, such as tea leaves of green tea, black tea, oolong tea, puer tea, etc. The extract extracted with hot water or the like may be used or removed effectively, or may be used as it is in a state dispersed in the extract.

  The tea leaves are preferably pulverized and used as fine particles. Various known methods can be applied as the pulverization method, and the crushed powder is pulverized in a dry state or a slurry state. Specifically, it is preferable to use a ball mill, a hammer mill, a roll crusher, a tower grinder, or the like. The particle size of the pulverized product is not limited as long as it can be contained in the rayon fiber. Preferably, among the crushed product of tea husk, the particle size of less than 1.0 μm is 95% or more. If the particle diameter is less than 1.0 μm and the amount is less than 95%, when the ground material of tea husk is added to and mixed with viscose, the viscosity of the viscose may increase and gelation may occur. Here, the particle size and its distribution can be measured by a method of photographing and image processing by passing the suspension through a flat flow cell. For example, using a flow method particle size distribution / image analysis device RapidVUE manufactured by Beckman Coulter, Inc. In other words, after taking 10 high-speed shots per second and correcting noise such as image noise and edge enhancement, particle shape features are extracted and digitized for measurement.

  Even when the tea crushed product is produced under dry conditions, it is preferably dispersed in water or the like and used as a dispersion. In order to disperse the tea crushed material in water, an appropriate dispersant such as a surfactant may be used or may not be used. It is preferable that the ratio of the ground crushed material to the rayon fiber in the aqueous dispersion is 1 to 80% by mass. More preferably, it is 5-70 mass%. When the amount is less than 1% by mass, the number of ground tea powders contained in the rayon fiber decreases, and sufficient antibacterial and deodorant properties cannot be obtained for the rayon fiber. Moreover, if the added amount of the crushed tea husk exceeds 80% by mass, the spinnability is lowered, the crushed crumb of the tea husk easily falls off from the obtained rayon fiber, or the strength and elongation of the rayon fiber. The mechanical properties tend to decrease, which may be undesirable.

The tea husk is preferably used after being subjected to heat treatment or ultraviolet irradiation treatment, particularly when green tea is used, 190 ° C. to 270 ° C., preferably 200 ° C. to 250 ° C., more preferably 210 ° C. to 230 ° C. for 10 minutes. It is good to use after heating for 60 minutes, more preferably 15 minutes to 40 minutes. In addition, in the ultraviolet irradiation treatment, the amount of light having a wavelength of 365 nm is 2.5 × 10 ⁻² J / m ^{2 to} 0.5 J / m ² , preferably 2.9 × 10 ⁻² J / m ² It is preferable to perform irradiation with a dose of 1.6 × 10 ⁻¹ J / m ² of light. A sufficient antibacterial effect can be seen by carrying out the heat treatment and the ultraviolet irradiation treatment alone, but both may be carried out.

  In the present invention, the viscose used for producing the rayon fiber is not particularly limited as long as it is used for producing a known viscose rayon fiber. For example, viscose having a cellulose content of about 7 to 10% by mass and an alkali such as caustic soda in an amount of about 50 to 80% by mass with respect to cellulose may be used. Viscose may optionally contain various additives such as various metal salts and antistatic agents. Further, a solution obtained by dissolving cellulose in copper ammonia water instead of viscose or using a solution of acetyl cellulose to make cupra rayon fiber or acetate rayon fiber with tea husk is also referred to as rayon fiber of the present invention.

  The step of adding the dispersion obtained by dispersing the ground tea powder to the viscose may be anywhere before spinning the viscose, but is most preferably added and mixed immediately before spinning. In general, the dispersion is an aqueous dispersion.

  After adding the dispersion liquid in which the crushed tea leaves are dispersed to the viscose, spinning can be performed in the same manner as in producing ordinary rayon fiber, and the spinning method is not particularly limited.

  For example, viscose may be extruded from a spinning nozzle into a coagulation liquid (liquid temperature of about 40 to 50 ° C.). The coagulation liquid generally contains 80 to 120 g / l sulfuric acid and 50 to 360 g / l sodium sulfate as main components.

  The viscose extruded into the coagulating liquid becomes regenerated cellulose and coagulates, and is then stretched as desired to obtain rayon fibers.

  In the present invention, since the ground crushed material is added and mixed in the viscose, the rayon fiber in a state where the ground crushed material is contained in the rayon fiber is obtained.

  Furthermore, in order to impart ultraviolet ray cutting properties to the rayon fiber obtained based on the configuration of the present invention, the raw material viscose is made of oxides of inorganic fine particles such as aluminum, titanium, zinc, antimony, zirconium, or barium sulfate, carbonic acid. Calcium, boron nitride, strontium aluminate, zinc sulfide, or the like may be kneaded, or an organic benzophenone-based, salicylic acid-based, cyanoacrylate-based, or benzotriazole-based absorbent may be added to the fabric.

  The 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 such a rayon fiber is spun into a yarn, it becomes a functional yarn. Moreover, if rayon fiber is integrated | stacked, it can also be set as a functional cotton-like thing, or if it joins between rayon fibers by arbitrary means, it will also become a functional nonwoven fabric. Furthermore, if the yarn is knitted, it becomes a functional knitted fabric. The obtained non-woven fabric and knitted fabric can be suitably used as a clothing material, for example. It can also be suitably used as a material for bed sheets, pillow covers, blankets, carpets, wall coverings, stuffed fabrics, curtains, quilts, cushion covers, automobile linings, and the like. Can be widely used for medical and nursing care.

  EXAMPLES Hereinafter, although this invention is demonstrated based on an Example, this invention is not limited to an Example.

How to collect tea husks Three types of commercially available tea leaves (green tea (sencha, Japanese tea, sold by ITO EN), oolong tea (Chinese, sold by Japanese tea sales, Chinese name) that differ in the fermentation method, fermentation method, etc. (Teakan / Tetsukannon tea) and black tea (Indian, rich black tea sold by Mitsui Norin) were used as samples. After putting a predetermined amount of distilled water into the enamel pan and boiling until it reaches a predetermined temperature (green tea is 70 ° C, oolong tea is 90 ° C, black tea is 90 ° C), a predetermined amount of various tea leaves (10 liters of water and 1000 g of tea leaves) ) And boiled for 30 minutes. Thereafter, the tea was filtered using a fine mesh ball made of stainless steel. The remaining tea leaves were collected and used.

Measurement method Antibacterial test Staphylococcus aureus NBRC 12732 was obtained from National Institute of Technology and Evaluation, and used for antibacterial evaluation. Staphylococcus aureus is a Gram-positive cocci that is a causative agent of food poisoning and is also known as a causative agent of purulent diseases.

An antibacterial evaluation test was performed using Staphylococcus aureus with reference to JIS-L-1902. A sample, 0.20 g of fiber, was collected and inserted into a vial. The vial containing the sample was sterilized at 121 ° C. for 15 minutes. Peptone water was adjusted to a predetermined concentration using peptone (1.0% by mass) manufactured by Becton Dickinson, yeast extract (0.5% by mass) manufactured by Becton Dickinson, and sodium chloride (0.5% by mass). The peptone water was used to adjust Staphylococcus aureus NBRC 12732 to 1.0 ± 0.3 × 10 ⁵ CFU / ml, and the sample was inoculated with 0.10 ml of the suspension. Sealed. And it culture | cultivated for 18 hours in the thermostat set to 37 +/- 1 degreeC.

10 ml of a physiological saline for washing adjusted to a predetermined concentration using sodium chloride (0.85% by mass) and Tween 80 (0.20% by mass) was added to the vial after incubation, and the bacteria were shaken and dispersed. . Against undiluted dispersions of each sample by adding saline prepared in sodium chloride (0.85 wt%) was diluted to a predetermined concentration of up to 10 ⁷ times. A bacterial solution diluted to each concentration was inoculated into a medium adjusted to 11.1% by mass using a mannitol salt medium. At that time, a method was adopted in which the culture medium was divided into four and the bacterial solution having the same dilution concentration was dropped into 5 sections of 5 μl in one compartment. The petri dish was inverted for 44 hours in a 37 ± 1 ° C. incubator. The number of growing colonies after culturing was counted, and the number of viable bacteria was calculated by multiplying by the dilution factor.

[Examples 1 to 5]
The three types of tea husks obtained by the method described above were subjected to wet pulverization using a mascolloider to obtain an aqueous dispersion of crushed tea husks (the mass ratio of crushed tea husks was 20% by mass). . The crushed material of the tea husks was measured using a flow method particle size distribution / image analysis device RapidVUE manufactured by Beckman Coulter, Inc., and 95% or more of them were less than 1.0 μm in particle size, and the number average particle size was about 0.7 μm. The maximum particle size was 2.5 μm.

  In the case of Example 1, a green tea (sencha) tea husk was subjected to heat treatment at the temperatures and times shown in the table using a hot plate. Further, in the case of Example 2, ultraviolet rays having a predetermined irradiation amount were applied to green tea (sencha) tea husk using a xenon tester Sun Tester XF-180 manufactured by Shimadzu Corporation. At that time, irradiation doses at a wavelength of 310 nm and a wavelength of 365 nm were measured. In Example 3, the pulverized product was used as it was.

  In Example 4, oolong tea was used instead of green tea, and in Example 5, black tea was used.

  Regarding the spinning method of the rayon fiber, first, the raw material pulp was immersed in an caustic soda aqueous solution of about 18%, and alkali cellulose was obtained by pressing and grinding. After aging this, carbon disulfide was reacted to obtain cellulose xanthate, which was then dissolved in dilute caustic soda solution to prepare viscose. This viscose had a cellulose content of 8.8%, an alkali content of 5.9%, and a viscosity of 50 seconds (falling ball type). The above-mentioned three types of aqueous dispersions were quantitatively and continuously added to the alkali viscose just before spinning by an injection pump and mixed uniformly. The crushed material of the above-mentioned tea husk was added and adjusted to 60 mass% with respect to the mass of cellulose in the viscose. Thereafter, viscose containing ground tea crushed material was spun into a coagulation / regeneration bath at a spinning speed of 68 m / min from a spinneret having a nozzle diameter of 0.06 mm and a hole number of 10,000. The coagulation / regeneration bath contained 110 g / l of sulfuric acid, 350 g / l of sodium sulfate, and 15 g / l of zinc sulfate, and the liquid temperature was 45 ° C. After spinning, the fiber was drawn by a conventional two-bath tension spinning method and then cut to obtain a short rayon fiber having a fineness of 1.5 denier and a fiber length of 51 mm. The obtained rayon short fibers had a dry strength of 1.85 to 1.15 g / d and a dry elongation of 11.2 to 19.3%. This had almost the same high elongation as compared with ordinary viscose rayon staple fibers. In addition, 95% or more of both oolong tea and black tea had a particle size of less than 1.0 μm.

  Next, the antibacterial property was evaluated for the rayon short fibers. Table 1 shows the results. As a result, the antibacterial activity of the short rayon fibers according to Examples 1, 2, 4, and 5 against S. aureus appeared very high. In other words, in the case of using tea husk as a raw material, no viable bacteria were observed except for 3, and very excellent antibacterial property was shown. Also, 3 was more effective than that using the extract.

[Comparative Examples 1-3]
A rayon fiber was obtained in the same manner as in Example 1, Example 4 and Example 5, except that instead of the tea husk slurry, the filtered extract was concentrated to the same dispersion amount as in the Example. . When the obtained rayon fiber was evaluated in the same manner as in the Examples, the results were inferior as shown in Table 2.

[Comparative Examples 4 to 6]
Comparative Example 4 is a case of rayon fiber not containing tea-derived components, and Comparative Examples 5 and 6 are evaluation results of cotton and wool fabrics not containing tea-derived components, respectively. It shows according to Table 2.

Claims (11)

  A rayon fiber comprising a rayon fiber containing crushed tea shells.   A method for producing rayon fiber, comprising: adding and mixing a dispersion obtained by dispersing ground tea powder into viscose, followed by spinning.   The method for producing rayon fiber according to claim 2, wherein the ground material of tea husk has a particle size of less than 1.0 µm and is 95% or more.   The method for producing rayon fiber according to claim 2 or 3, wherein the added amount of the ground tea ground material is 1 to 80% by mass relative to the mass of cellulose in the viscose.   The rayon fiber according to claim 1, wherein the tea husk is a tea husk of tea subjected to fermentation treatment, semi-fermentation treatment, or post-fermentation treatment.   The method for producing rayon fiber according to any one of claims 2 to 4, wherein the tea husk is tea husk of tea subjected to fermentation treatment, semi-fermentation treatment, or post-fermentation treatment.   The rayon fiber according to claim 1, wherein the tea shell is a green tea tea shell.   The method for producing rayon fiber according to any one of claims 2 to 4, wherein the tea shell is a green tea tea shell. Things pulverized tea leaves was heated for 10 minutes to 60 minutes at 190 ° C. to 290 ° C. Alternatively, a wavelength 365nm to pulverized tea leaves ^{2.5 × 10 -2 J / m 2} ~0.5J / m 2 dose The rayon fiber according to claim 1 or 7, wherein the one irradiated with a light amount or one subjected to both is used.   The method for producing rayon fiber according to any one of claims 2 to 4 and 8, wherein a tea husk obtained by heating a crushed tea husk at 190 to 290 ° C for 10 to 60 minutes is used. The pulverized tea leaves at a wavelength ^{365nm 2.5 × 10 -2 J / m} 2 ~0.5J / m ² dose amount of used tea leaves that was irradiated according to any one of claims 2-4 and 8 A method for producing rayon fiber.