JP7094796B2 - Rayon fiber - Google Patents

Description

The present invention relates to rayon fibers. More specifically, the present invention has excellent moisture absorption, water absorption and quick-drying properties, and is used for clothing such as gloves, underwear, socks, shirts and clothes, as well as cosmetic sheets such as face masks, materials for paper diapers, and wiping rayon sheets. The present invention relates to rayon fibers expected to be used for various purposes such as, knitted and woven fabrics containing the rayon fibers, and non-woven fabrics containing the rayon fibers.

As a rayon fiber having excellent moisturizing properties, a moisturizing rayon fiber in which a large number of Bincho charcoal fine particles obtained by crushing Bincho charcoal are embedded in a rayon fiber base has been proposed (see, for example, Patent Document 1). The rayon fiber is excellent in moisturizing property and can be used for a cosmetic sheet because it can retain water on the skin even after the rayon fiber is removed from the skin.

However, Bincho charcoal is used for the moisturizing rayon fiber, and if the amount of the Bincho charcoal is increased in order to improve the moisturizing property, the coloring of the moisturizing rayon fiber by the Bincho charcoal becomes deeper. It becomes unsuitable for the purpose of. Further, the moisturizing property of the moisturizing rayon fiber is not so high because it is derived from Bincho charcoal contained in the moisturizing rayon fiber.

Further, in recent years, the development of rayon fiber having excellent hygroscopicity, water absorption and quick-drying property has been desired.

Japanese Unexamined Patent Publication No. 2009-299211

The present invention has been made in view of the above-mentioned prior art, and is excellent in moisture absorption, water absorption and quick-drying. For example, clothing such as gloves, underwear, socks, shirts, clothes, face masks, and materials for paper diapers. It is an object of the present invention to provide rayon fibers expected to be used for various purposes such as cosmetic sheets such as wiping lotion sheets, knitted woven fabrics containing the rayon fibers, and non-woven fabrics containing the rayon fibers. do.

The present invention
(1) A rayon fiber having moisturizing properties, characterized in that Suizenji nori-derived polysaccharide is contained in a ratio of 0.01 to 0.5 parts by mass per 100 parts by mass of rayon. ,
(2) The knitted fabric characterized by containing the rayon fiber according to the above (1), and (3) the nonwoven fabric containing the rayon fiber according to the above (1).

According to the present invention, it has excellent moisture absorption, water absorption and quick-drying properties, and is, for example, a cosmetic sheet such as clothing such as gloves, underwear, socks, shirts and clothes, a face mask, a material for paper diapers, and a wiping rayon sheet. Provided are rayon fibers expected to be used for various purposes such as, knitted and woven fabrics containing the rayon fibers, and non-woven fabrics containing the rayon fibers.

It is a graph which shows the measurement result of the time-dependent change of the water absorption rate B of the nonwoven fabric obtained in Examples 10 to 12 and Comparative Example 3.

As described above, the rayon fiber of the present invention is a rayon fiber having a moisturizing property, and contains the Suizenji nori-derived polysaccharide at a ratio of 0.01 to 0.5 parts by mass per 100 parts by mass of the rayon. It is characterized by being.

As a raw material for the rayon fiber of the present invention, a polysaccharide derived from rayon and Suizenji nori is used. The raw material may contain additives such as colorants such as dyes and pigments, antistatic agents, softeners and antibacterial agents as long as the object of the present invention is not impaired.

For rayon, viscose generally used for rayon fiber can be used. For viscous, for example, raw material pulp such as sulfite pulp is immersed in an aqueous solution of sodium hydroxide in an amount of about 17 to 18% by mass, and the obtained alkaline cellulose is squeezed, crushed, and aged if necessary. After preparing zantate by spraying carbon sulfide, the zantate can be prepared by dissolving the zantate in an alkaline aqueous solution such as an aqueous sodium hydroxide solution. Viscose generally contains cellulose in a content of about 7 to 10% by mass, and an alkali such as sodium hydroxide in a content of about 3 to 10% by mass.

The polysaccharide derived from Suizenji nori is a high molecular weight polysaccharide extracted from Suizenji nori. Suizenji nori is a freshwater blue-green algae that grows naturally in the Kyushu region of Japan. Suizenji nori may be of natural origin or may be cultured. Suizenji nori may be used as it is or may be dried.

The polysaccharide derived from Suizenjinori has a repeating unit in which a sugar structure having a hexose structure and a sugar structure having a pentose structure are linked in a linear or branched chain by an α-glycosidic bond or a β-glycosidic bond. Contains sulfated polysaccharides.

The Suizenji nori-derived polysaccharide contains hexose, pentose and sulfated muramic acid as sugar structures from the viewpoint of obtaining rayon fiber having excellent hygroscopicity, water absorption and quick-drying property, and formula (I) :.

(In the formula, R ¹ to R ⁸ independently indicate a hydroxyl group, a sulfooxy group, or an alkoxy group having 1 to 3 carbon atoms).
A trisaccharide structure represented by, a disaccharide structure having hexose and pentose as constituent monosaccharides, a disaccharide structure having hexose and deoxyhexose as constituent monosaccharides, a disaccharide structure having two pentoses as constituent monosaccharides, pentose and At least one selected from the group consisting of a disaccharide structure having deoxyhexose as a constituent monosaccharide, a disaccharide structure having two hexosamines as constituent monosaccharides, and a disaccharide structure having uronic acid and deoxyhexose as constituent monosaccharides. It is preferable that the monosaccharide structure of the above is contained.

In the formula (I), R ¹ to R ⁸ are independently hydroxyl groups, sulfooxy groups, or alkoxy groups having 1 to 3 carbon atoms. Examples of the alkoxy group having 1 to 3 carbon atoms include a methoxy group and an ethoxy group, but the present invention is not limited to these examples. Among these alkoxy groups having 1 to 3 carbon atoms, a methoxy group is preferable from the viewpoint of obtaining rayon fibers having excellent hygroscopicity, water absorption and quick-drying properties.

In the disaccharide structure, examples of the hexose include aldohexoses such as glucose, galactose, and mannose, but the present invention is not limited to these examples. Among these hexoses, aldohexose is preferable, and glucose, galactose and mannose are more preferable from the viewpoint of obtaining rayon fibers having excellent hygroscopicity, water absorption and quick-drying property. Examples of the pentose include xylose and arabinose, but the present invention is not limited to these examples. Among these pentoses, xylose and arabinose are preferable from the viewpoint of obtaining rayon fibers having excellent hygroscopicity, water absorption and quick-drying property. Examples of the deoxyhexose include fucose and rhamnose, but the present invention is not limited to such examples. Among these deoxyhexoses, fucose and rhamnose are preferable from the viewpoint of obtaining rayon fiber having excellent hygroscopicity, water absorption and quick-drying property. Examples of uronic acid include glucuronic acid and galacturonic acid, but the present invention is not limited to these examples. Among these uronic acids, glucuronic acid and galacturonic acid are preferable from the viewpoint of obtaining rayon fibers having excellent hygroscopicity, water absorption and quick-drying properties.

Examples of the method for preparing the Suizenji nori-derived polysaccharide include the method described in International Publication No. 2008/062574. As a specific method for preparing the Suizenji nori-derived polysaccharide, for example, as described in the following preparation examples, Suizenji nori is added to an alkaline aqueous solution, and the Suizenji nori-derived polysaccharide contained in Suizenji nori is added to the alkaline aqueous solution. However, the present invention is not limited to such an example.

For Suizenji nori, for example, the water-soluble dye may be removed in advance by washing with water, or the fat-soluble dye may be removed in advance by washing the Suizenji nori with alcohol such as methanol, ethanol, or isopropanol.

Examples of the alkali of the alkaline aqueous solution used for preparing the Suizenji nori-derived polysaccharide include sodium hydroxide, potassium hydroxide, ammonia and the like, but the present invention is not limited to these examples. Of these alkalis, sodium hydroxide is preferred.

The concentration of alkali in the alkaline aqueous solution is usually preferably about 0.01 to 1N. The temperature of the alkaline aqueous solution when Suizenji nori is added to the alkaline aqueous solution is preferably 20 to 90 ° C, more preferably 60 to 85 ° C. After adding Suizenji nori to the alkaline aqueous solution, it is preferable to stir the obtained mixture for about 1 to 5 hours.

By using the alkaline aqueous solution as described above, the polysaccharide derived from Suizenji nori can be extracted from the Suizenji nori into the alkaline aqueous solution.

The weight average molecular weight of the polysaccharide derived from Suizenji nori is not particularly limited, but is preferably 2000 or more, more preferably 5000 or more, still more preferably 10,000 or more from the viewpoint of obtaining rayon fiber having excellent hygroscopicity, water absorption and quick-drying property. From the viewpoint of obtaining rayon fibers having excellent hygroscopicity, water absorption and quick-drying property as described above, it is preferably 40 million or less, more preferably 20 million or less, still more preferably 10 million or less, still more preferably 500. It is 10,000 or less, even more preferably 3 million or less, and particularly preferably 1 million or less. The weight average molecular weight of the polysaccharide derived from Suizenji nori is a value measured by gel filtration chromatography.

The weight average molecular weight of the Suizenji nori-derived polysaccharide is, for example, obtained by adding an acid to an alkaline aqueous solution containing the Suizenji nori-derived polysaccharide extracted from Suizenji nori and heating the obtained mixed solution to a temperature of about 20 to 80 ° C. Can be adjusted. The heating time of the mixed solution varies depending on the heating temperature of the mixed solution and the like and cannot be unconditionally determined, but is usually about 0.5 to 2 hours. Examples of the acid include hydrochloric acid, sulfuric acid, nitric acid, phosphoric acid, boric acid, formic acid, acetic acid, fatty acid and the like, but the present invention is not limited to these examples.

If necessary, the Suizenji nori-derived polysaccharide may be purified by filtering an aqueous solution of the Suizenji nori-extracted polysaccharide with a filter to remove insoluble matters, and the aqueous solution of the Suizenji nori-derived polysaccharide and methanol, ethanol, isopropanol, etc. may be used. It may be prepared into a fibrous Suizenji nori-derived polysaccharide by mixing with an organic solvent.

The solubility of the polysaccharide derived from Suizenji nori in water at 25 ° C. is usually about 2 to 30%.

The polysaccharide derived from Suizenji nori can be easily obtained commercially, and for example, it can be easily obtained from Green Science Material Co., Ltd. under the trade name: Sakuran (registered trademark).

In producing the rayon fiber of the present invention, first, viscose and a polysaccharide derived from Suizenji nori are mixed. At that time, the Suizenji nori-derived polysaccharide is usually preferably used in the state of an aqueous solution of the Suizenji nori-derived polysaccharide from the viewpoint of improving the dispersibility between the viscose and the Suizenji nori-derived polysaccharide.

By mixing viscose and Suizenji nori-derived polysaccharide, a spinning stock solution can be prepared.

The amount of rayon-derived polysaccharides per 100 parts by mass of rayon is 0.01 part by mass or more from the viewpoint of obtaining rayon fibers having excellent hygroscopicity, water absorption and quick-drying properties, and is hygroscopic and water-absorbent as described above. From the viewpoint of obtaining rayon fibers having excellent quick-drying properties, the amount is 0.5 parts by mass or less, preferably 0.3 parts by mass or less, and more preferably 0.1 parts by mass or less.

Rayon fibers can be obtained by extruding the undiluted spinning solution obtained above from the pores of the spinneret into a coagulation bath with a squeezing pump or the like and coagulating it.

The spinneret is generally manufactured of an alloy such as an alloy of gold and platinum, an alloy of platinum and iridium, and an alloy of platinum and palladium. The pore diameter of the spinneret is appropriately determined according to the fineness of the target rayon fiber, but is usually about 0.05 to 0.1 mm. The number of holes provided in the spinneret is not particularly limited, but is usually about 30 to 20,000. The plurality of single fibers extruded from the plurality of holes are converged into one bundle to form one rayon fiber.

As the coagulation liquid, for example, dilute sulfuric acid to which sodium sulfate, ammonium sulfate, magnesium sulfate, zinc sulfate or the like is added can be used.

The rayon fiber obtained as described above may be desulfurized, if necessary. The desulfurization treatment of rayon fiber can be performed, for example, by washing the rayon fiber with water and eluting decomposition products, sulfur and the like contained in the rayon fiber with an aqueous solution of sodium sulfate. If necessary, the rayon fibers may be bleached, washed with water and dried.

The fineness of the rayon fiber varies depending on the use of the rayon fiber and the like and cannot be unconditionally determined, but is usually about 1 to 30 decitex. The fineness of the rayon fiber can be easily adjusted by adjusting the hole diameter of the spinneret.

Rayon fibers may be stretched if necessary. Further, the rayon fiber may be used as a long fiber as it is, or may be cut to a desired fiber length and used as a short fiber. Since the fiber length of the rayon fiber differs depending on the use of the rayon fiber and the like, it is preferable to appropriately determine the fiber length according to the use and the like of the rayon fiber.

Since the rayon fiber of the present invention is excellent in hygroscopicity, water absorption and quick-drying property, it can be suitably used for, for example, knitted fabrics, non-woven fabrics and the like. The knitted woven fabric means a knitted fabric or a woven fabric.

The knitted fabric can be produced by using the rayon fiber of the present invention and using a knitting machine or the like. When producing a knitted fabric, the rayon fiber of the present invention may be used as it is, for example, the rayon fiber of the present invention and synthetic fiber such as polyester fiber and acrylic fiber, and fiber such as cotton yarn, yarn and raw silk. You may use the blended yarn of.

In general, a blended yarn containing synthetic fibers such as polyester fiber and acrylic fiber has hydrophobicity and lipophilicity in the synthetic fiber used in the blended yarn, and therefore, when the blended yarn comes into contact with human skin. Since it absorbs sebum, it may contribute to itching of the skin.

On the other hand, in the blended yarn containing the rayon fiber of the present invention in addition to the synthetic fiber such as polyester fiber and acrylic fiber, the rayon fiber is excellent in moisture absorption and water absorption. It is expected to suppress itching of the skin due to contact with the skin.

The ratio of the rayon fiber of the present invention to the synthetic fiber (rayon fiber / synthetic fiber: mass ratio) in the blended yarn cannot be unconditionally determined because it varies depending on the use of the blended yarn and the like, but the rayon fiber of the present invention. From the viewpoint of sufficiently expressing the properties of synthetic fibers while maintaining the moisture absorption, water absorption and quick-drying properties of rayon, it is preferably 10/90 to 90/10, more preferably 20/80 to 80/20, and further. It is preferably 30/70 to 70/30.

Examples of the knitted fabric include flat knitting, rubber knitting, pearl knitting, and the like, but the present invention is not limited to such examples.

The knitted fabric containing the rayon fiber of the present invention has hygroscopicity, water absorption and quick-drying properties, as well as flexibility, elasticity and elasticity, and is therefore suitable for use in, for example, underwear, socks, gloves and the like. Can be done.

The woven fabric can be produced by using the rayon fiber of the present invention for warp and weft, or both warp and weft, and using a loom or the like.

The woven fabric may be a woven fabric in which a blended woven fabric containing the rayon fiber of the present invention is used in a part or all of the warp and weft, and the composition of the warp and the weft is different, and the warp and / or the weft may be used. It may be a mixed woven fabric in which the rayon fiber of the present invention is used, or it may be a high-distribution woven fabric containing the rayon fiber of the present invention and using warp yarns and weft yarns having different fiber diameters.

Examples of the structure of the woven fabric include a plain weave structure, a diagonal weave structure, a twill weave structure, a satin weave structure, a change structure, and the like, but the present invention is not limited to these examples.

Since the woven fabric containing the rayon fiber of the present invention has hygroscopicity, water absorption and quick-drying property, it can be suitably used for, for example, shirts and clothes.

The nonwoven fabric is used as a fiber containing the rayon fiber of the present invention, and can be produced by a dry method or a wet method.

The fiber used for the non-woven fabric may be only the rayon fiber of the present invention, or is a blended yarn of the rayon fiber of the present invention and a synthetic fiber such as a polyester fiber or an acrylic fiber, or a fiber such as a cotton yarn, a yarn or a raw yarn. May be good.

Examples of the dry method include mechanical coupling methods typified by the chemical imperial method, the thermal imperial method, the needle punching method, the airlaid method, and the like, but the present invention is not limited to these examples. Examples of the wet method include, for example, a water flow confounding method, but the present invention is not limited to such an example.

Since the non-woven fabric containing rayon fiber of the present invention has hygroscopicity, water absorption and quick-drying property, it is suitable for, for example, clothing, face masks, materials for paper diapers, cosmetic sheets such as wipe wipe sheets, and the like. Can be used.

As described above, since the rayon fiber of the present invention is excellent in moisture absorption, water absorption and quick-drying, clothing such as gloves, underwear, socks, shirts and clothes, face masks, materials for disposable diapers, etc. It can be suitably used for various purposes such as a cosmetic sheet such as a wipe-off rayon sheet.

Next, the present invention will be described in more detail based on examples, but the present invention is not limited to such examples.

Preparation Example 1
Alkaline cellulose was obtained by immersing the raw material pulp in an aqueous solution of about 18% by mass of sodium hydroxide, squeezing it, and pulverizing it. The alkali cellulose obtained above was left at a temperature of 40 to 60 ° C. for about 6 hours, and then carbon disulfide was sprayed onto the alkali cellulose to react the alkali cellulose with carbon disulfide to obtain zantate. .. Viscose was prepared by dissolving the zantate obtained above in a dilute aqueous sodium hydroxide solution.

The content of cellulose in the viscose obtained above was 9% by mass, the content of alkali in the viscose was 5% by mass, and the falling ball viscosity of the viscose at 25 ° C. was 50 seconds. The falling ball viscosity is a value measured by the method described in JIS Z8803.

Preparation Example 2
After thawing 1 kg of frozen Suizenji nori, it was washed with water. The suisenjinori is added to 5 L of hydrochloric acid having a pH of 3.0, heated to 60 ° C. for 1 hour with stirring, taken out from the hydrochloric acid, added to an isopropanol aqueous solution containing 30% by volume of water, and added to 60 ° C. It was heated for about 12 hours while stirring at the temperature of. Next, Suizenji nori was separated from the isopropanol aqueous solution and dried in the air at room temperature for about 12 hours to obtain about 12 g of a dried product of Suizenji nori.

About 12 g of the dried Suizenji nori obtained above is added to 4 L (liter; the same applies hereinafter) of a 0.1 N sodium hydroxide aqueous solution and heated to 70 ° C. for 3 hours with stirring to hydroxylate the dried Suizenji nori. It was dissolved in an aqueous sodium solution. The obtained solution was neutralized with hydrochloric acid and filtered with gauze to obtain about 3.9 L of a solution of Suizenji nori-derived polysaccharide.

Next, the solution of the Suizenji nori-derived polysaccharide obtained above was added to isopropanol with stirring to obtain a fibrous Suizenji nori-derived polysaccharide. The fibrous Suizenji nori-derived polysaccharide obtained above was dried under reduced pressure to remove isopropanol, and about 7.5 g of the dried Suizenji nori-derived polysaccharide was obtained.

Example 1
The viscose obtained above and the polysaccharide derived from Suizenji nori obtained above are mixed so that the amount of the polysaccharide derived from Suizenji nori per 100 parts by mass of rayon contained in the viscose is 0.01 part by mass. The undiluted spinning solution was prepared by dissolving the polysaccharide derived from Suizenji nori so as to have a uniform composition.

A coagulation bath at 47 ° C. (sulfuric acid 95 g / L, sodium 350 g / L and zinc sulfate 12.5 g / L) provided with 13000 nozzles having a pore diameter of 0.06 mm for the undiluted spinning solution obtained above. (Sulfuric acid aqueous solution containing , A rayon fiber having a fiber length of 38 mm was obtained.

Next, the water swelling degree of the rayon fiber obtained above was measured by the following measuring method according to JIS L1015 8.26 “Water swelling degree measuring method”. The results are shown in Table 1.

[Measurement method of water swelling degree]
Approximately 2 g of rayon fiber is added to a 500 mL beaker containing 200 mL of water at 20 ± 2 ° C, completely submerged in water, the beaker is left in a constant temperature bath at 20 ± 2 ° C for 15 minutes, and then centrifuged. It was dehydrated with a centrifuge at a force of 1000 to 1050 G for 10 minutes. Weigh the mass of dehydrated rayon fiber and the absolute dry mass of the rayon fiber, and formula:
[Water swelling degree]
= {[(Mass of dehydrated rayon fiber)-(Mass of absolute dry rayon fiber)]
÷ [Absolute dry mass of rayon fiber]} × 100
The degree of water swelling was determined based on.

Example 2
In Example 1, the fineness of 1.4 decitex and the fiber length were the same as in Example 1 except that the amount of the polysaccharide derived from suisenjinori per 100 parts by mass of rayon contained in viscose was adjusted to 0.02 parts by mass. A 38 mm rayon fiber was obtained. The degree of water swelling of the obtained rayon fiber was determined in the same manner as described above. The results are shown in Table 1.

Example 3
In Example 1, the fineness of 1.4 decitex and the fiber length were the same as in Example 1 except that the amount of the polysaccharide derived from suisenjinori per 100 parts by mass of rayon contained in viscose was adjusted to 0.05 parts by mass. A 38 mm rayon fiber was obtained. The degree of water swelling of the obtained rayon fiber was determined in the same manner as described above. The results are shown in Table 1.

Example 4
In Example 1, the fineness of 1.4 decitex and the fiber length were the same as in Example 1 except that the amount of the polysaccharide derived from suisenjinori per 100 parts by mass of rayon contained in viscose was adjusted to 0.10 parts by mass. A 38 mm rayon fiber was obtained. The degree of water swelling of the obtained rayon fiber was determined in the same manner as described above. The results are shown in Table 1.

Comparative Example 1
Rayon fibers having a fineness of 1.4 decitex and a fiber length of 38 mm were obtained in the same manner as in Example 1 except that the polysaccharide derived from Suizenji nori was not used in Example 1. The degree of water swelling of the obtained rayon fiber was determined in the same manner as described above. The results are shown in Table 1.

From the results shown in Table 1, the rayon fibers obtained in Examples 1 to 4 have a water swelling degree of 10 points or more as compared with the rayon fibers containing no polysaccharide derived from Suizenji nori obtained in Comparative Example 1. It can be seen that the hygroscopicity is remarkably excellent.

Production Example 1
The rayon fiber and cotton were mixed so as to have a uniform composition of rayon fiber content of 30% by mass and cotton content of 70% by mass obtained in Example 2, and the number of twists was 22 times /. A rayon / cotton mixed yarn of 40 single yarns was produced by ring spinning at 吋 (about 8.7 times / cm).

Manufacturing example 2
The two were mixed so as to have a uniform composition so that the content of the rayon fiber obtained in Example 2 was 30% by mass and the content of the commercially available rayon fiber was 70% by mass, and the vortex air spinning machine [Murata]. Machinery Co., Ltd., trade name: VORTEX spinning frame] was used to produce 40 single-thread rayon yarns.

Example 5
The rayon / cotton mixed yarn obtained in Production Example 1 is used for the front yarn, and 22 decitex polyurethane fibers are used for the back yarn. A machine [manufactured by Fukuhara Seiki Seisakusho Co., Ltd.] was used to adjust the yarn length of the front yarn to 100 wells and 300 mm, and the yarn length of the back yarns to 100 wells and 120 mm to produce a raw machine for rayon.

Next, using a solution containing a surfactant and hydrogen peroxide at 95 ° C., the raw machine obtained above was treated with a liquid flow dyeing machine for 40 minutes to perform scouring and bleaching, and then the solution was added to the inside. A white knitted fabric was obtained by summing, washing the raw machine with water, and then performing a flexible finish on the raw machine.

Using a medium temperature type dyeing solution containing a reactive dye, the white knitted fabric obtained above is dyed with a liquid flow dyeing machine at a temperature of 60 ° C. for 50 minutes, and then the white knitted fabric is washed and neutralized. A dyed knitted fabric was obtained by performing a flexible finish on the white knitted fabric.

Example 6
The yarns are arranged so that the rayon yarns obtained in Production Example 2 and the 100% cotton yarns using organic cotton are alternately knitted in 1 course × 1 course for the front yarns, and 22 decitex polyurethane fibers are arranged for the back yarns. With a 28-gauge, 30-inch (about 76.2 cm) single knit knitting machine with an open-reverse winder [manufactured by Fukuhara Seiki Seisakusho Co., Ltd.], the yarn length of the front yarn is 100 wells and the yarn length of the back yarn is 300 mm. Was adjusted to 100 wells and 120 mm, and a raw machine of bare tenjiku was prepared.

Next, a white knitted fabric was prepared in the same manner as in Example 5 using the bare tenjiku raw machine obtained above, and a dyed knitted fabric was prepared.

Example 7
The rayon yarn obtained in Production Example 2 is used for the front yarn, and 22 decitex polyurethane fibers are used for the back yarn. Fukuhara Seiki Seisakusho Co., Ltd.] adjusted the yarn length of the front yarn to 100 wells and 300 mm, and the yarn length of the back yarns to 100 wells and 120 mm to produce a raw rayon machine.

Next, a white knitted fabric was prepared in the same manner as in Example 5 using the bare tenjiku raw machine obtained above, and a dyed knitted fabric was prepared.

Comparative Example 2
The yarns are arranged so that 100% cotton yarns using organic cotton are alternately knitted in 1 course x 1 course, and 22 decitex polyurethane fibers are used for the back yarns, 28 gauge, 30 吋 (about). Adjust the yarn length of the front yarn to 100 wells and 300 mm and the yarn length of the back yarn to 100 wells and 120 mm with a single knit knitting machine with an open-reverse winder (76.2 cm) [manufactured by Fukuhara Seiki Seisakusho Co., Ltd.]. , I made a raw machine of bare tenjiku.

Next, a white knitted fabric was prepared in the same manner as in Example 5 using the bare tenjiku raw machine obtained above, and a dyed knitted fabric was prepared.

Experimental Example 1
Using the dyed knitted fabrics obtained in Examples 5 to 7 and Comparative Example 2, the performance of each dyed knitted fabric was evaluated based on the following evaluation methods. The results are shown in Table 2.

[Evaluation method of hygroscopicity and moisture release]
A test piece was obtained by cutting the dyed knitted fabric into a size of 10 cm in length and 10 cm in width. The obtained test piece is placed in a constant temperature bath having a temperature of 25 ° C. and a relative humidity of 40%, the mass of the test piece is measured, and the test piece is left to stand until the mass becomes constant. I got a piece X.

Next, the test piece X obtained above is placed in a constant temperature bath having a temperature inside the tank of 25 ° C. and a relative humidity of 80% to absorb moisture into the test piece, and the mass of the test piece X is increased for 10 seconds. Each test piece A was measured and left to stand until the mass became constant to obtain a test piece A.

Next, the hygroscopic test piece A is placed in a constant temperature bath having a temperature inside the tank of 25 ° C. and a relative humidity of 40%, and the mass of the test piece A is measured every 10 seconds. The test piece B was obtained by leaving it to stand until it became constant.

(1) Moisture absorption amount The moisture absorption amount (g) was obtained by subtracting the mass of the test piece B from the mass of the test piece A.
(2) Hygroscopicity The hygroscopicity is the formula:
[Hygroscopicity (%)] = {[Hygroscopic amount (g)] ÷ [Mass (g) of test piece A]} × 100
Obtained based on.
(3) Moisture absorption rate As the moisture absorption rate, the time required from the time when the test piece X was placed in the constant temperature bath to the time when the test piece A was obtained was measured.
(4) Moisture release rate As the moisture release rate, the time required from the time when the test piece A was placed in the constant temperature bath to the time when the test piece B was obtained was measured.

(5) Hygroscopic A
When the moisture absorption amount of the dyed knitted fabric obtained in Comparative Example 2 was 100, the relative value of the moisture absorption amount of the dyed knitted fabric obtained in Examples 5 to 7 was obtained, and the value was used as an index of hygroscopicity. The larger the value of the hygroscopicity A of the dyed knitted fabric, the more excellent the hygroscopicity of the dyed knitted fabric.
(6) Hygroscopicity B
The relative value of the hygroscopicity of the dyed knitted fabric obtained in Examples 5 to 7 was obtained when the hygroscopicity of the dyed knitted fabric obtained in Comparative Example 2 was 100, and the value was used as an index of hygroscopicity. The larger the value of the hygroscopicity B of the dyed knitted fabric, the more excellent the hygroscopicity of the dyed knitted fabric.
(7) Quick-drying The relative value of the moisture release rate of the dyed knitted fabric obtained in Examples 5 to 7 was obtained when the moisture release rate of the dyed knitted fabric obtained in Comparative Example 2 was 100, and the value was calculated. It was used as an index of quick-drying. The larger the quick-drying value of the dyed knitted fabric, the better the quick-drying property of the dyed knitted fabric.

From the results shown in Table 2, the dyed knitted fabrics obtained in Examples 5 to 7 were significantly more hygroscopic A and hygroscopic B than the dyed knitted fabrics obtained in Comparative Example 2. It can be seen that it is excellent in and also excellent in quick-drying. Therefore, when the dyed knitted fabric obtained in Examples 5 to 7 is used for clothes, for example, it quickly absorbs moisture such as sweat adhering to the clothes, and when it dries, it quickly releases the moisture in the clothes. , It is thought to reduce the stuffiness in clothes.

From the above results, when the dyed knitted fabric obtained in Examples 5 to 7 is used for the garment, the garment keeps the humidity environment in the garment comfortable. Expected to protect.

Example 8
A woven fabric was produced by using the rayon / cotton mixed yarn obtained in Production Example 1 as warp and weft. When the performance of the obtained woven fabric was evaluated in the same manner as in Experimental Example 1, it was confirmed that it was excellent in hygroscopicity and quick-drying.

Example 9
Using the rayon fiber obtained in Example 2, a non-woven fabric was produced by a water flow confounding method. When the performance of the obtained nonwoven fabric was evaluated in the same manner as in Experimental Example 1, it was confirmed that it was excellent in hygroscopicity and quick-drying.

Example 10
The rayon fiber obtained in Example 2 was charged into a card machine to form a fiber web. After the fiber web obtained above is placed on the transport belt, high-pressure water streams having a water pressure of 2 MPa, 5 MPa, and 5 MPa are sequentially injected from the water flow injector toward the fiber web while the transport belt is running. The fiber web was treated with water flow confounding. Next, the fiber web subjected to the water flow entanglement treatment was dehydrated and dried to obtain a non-woven fabric having a basis weight of 45 g / m ³ .

Example 11
Example 10 except that a mixture of 50% by mass of the rayon fiber obtained in Example 2 and 50% by mass of a commercially available ordinary rayon fiber was used instead of the rayon fiber obtained in Example 2. By performing the same operation as in No. 10, a non-woven fabric having a grain of 45 g / m ³ was obtained.

Example 12
Example 10 except that a mixture of 30% by mass of the rayon fiber obtained in Example 2 and 70% by mass of a commercially available ordinary rayon fiber was used instead of the rayon fiber obtained in Example 2. By performing the same operation as in No. 10, a non-woven fabric having a grain of 45 g / m ³ was obtained.

Comparative Example 3
In Example 10, a non-woven fabric having a basis weight of 45 g / m ³ was obtained by performing the same operation as in Example 10 except that commercially available ordinary rayon was used instead of the rayon fiber obtained in Example 2. ..

Experimental Example 2
Using the nonwoven fabrics obtained in Examples 10 to 12 and Comparative Example 3, the water absorption rate A of each nonwoven fabric was measured based on the following measuring method.

[Measuring method of water absorption rate A]
The non-woven fabrics obtained in Examples 10 to 12 and Comparative Example 3 were cut into a size of 5 cm in length and 5 cm in width to obtain a test piece P. The test piece P was immersed in water maintained at 20 ° C. for 15 minutes to absorb water, and then dehydrated with a centrifuge at a centrifugal force of 1000 G for 10 minutes to obtain a test piece Q. Using the test piece P and the test piece Q, the formula:
[Water absorption rate A]
= {[(Mass of test piece Q)-(Mass of test piece P)] ÷ [Mass of test piece P]} × 100
The water absorption rate was calculated based on. Table 3 shows the measurement results of the water absorption rate A.

Next, in order to investigate the change over time in the water absorption rate B of the nonwoven fabrics obtained in Examples 10 to 12 and Comparative Example 3, the test piece P obtained above was used, and the change over time in the water absorption rate B of the test piece P was used. It was investigated based on the measurement method of.

[Measuring method of change over time in water absorption rate B]
The test piece R was prepared by immersing the test piece P in water kept at 20 ° C. for 15 minutes. The test piece R obtained above was hung vertically in a constant temperature bath having a temperature inside the tank of 25 ° C. and a relative humidity of 40%, and left to stand, and the change in mass of the test piece R with time was examined. The mass of the test piece R after a predetermined time has elapsed from the start of leaving in the constant temperature bath was measured, and the formula:
[Water absorption rate B]
= {[(Mass of test piece R after a predetermined time has elapsed from the start of leaving in a constant temperature bath)
-(Mass of test piece P)] ÷ [Mass of test piece P]} x 100
The water absorption rate B was determined based on the above. The measurement result of the water absorption rate B is shown in FIG. FIG. 1 is a graph showing the measurement results of changes over time in the water absorption rate B of the nonwoven fabrics obtained in Examples 10 to 12 and Comparative Example 3.

In FIG. 1, reference numeral A indicates a change over time in the water absorption rate B of the nonwoven fabric obtained in Example 10, and reference numeral B indicates a change over time in the water absorption rate B of the nonwoven fabric obtained in Example 11. Indicates the change over time in the water absorption rate B of the nonwoven fabric obtained in Example 12, and reference numeral D indicates the change over time in the water absorption rate B of the nonwoven fabric obtained in Comparative Example 3.

From the results shown in Table 3 and FIG. 1, the nonwoven fabrics obtained in Examples 10 to 12 have higher water absorption rates A and B than those obtained in Comparative Example 3. From this, it can be seen that the water absorption is excellent, and the higher the content of the rayon fiber contained in the non-woven fabric, the higher the hygroscopicity tends to be.

Therefore, since the cosmetic face mask using the non-woven fabric obtained in Examples 10 to 12 has excellent water absorption, it can be impregnated with a large amount of cosmetics such as a beauty essence, and thus human skin. It is expected that the beauty effect will be enhanced by supplying a large amount of cosmetics.

Since the rayon fiber of the present invention is excellent in moisture absorption, water absorption and quick-drying, for example, clothing such as gloves, underwear, socks, shirts and clothes, face masks, materials for disposable diapers, wipe-off cosmetic water sheets. It is expected to be used for various purposes such as cosmetic sheets.

Claims (3)

A rayon fiber having a moisturizing property, which is characterized by containing 0.01 to 0.5 parts by mass of Suizenji nori-derived polysaccharides per 100 parts by mass of rayon. A knitted woven fabric containing the rayon fiber according to claim 1. A nonwoven fabric containing the rayon fiber according to claim 1.

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