JP3766566B2 - Antibacterial viscose rayon and method for producing the same - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a viscose rayon having antibacterial properties and a method for producing the same.
[0002]
[Prior art]
Methods for mixing and spinning proteins and protein derivatives to improve viscose rayon have been known so far. For example, Japanese Examined Patent Publication No. 35-11458 discloses a method of improving the dyeability of acid dyes at the same time as having a wool-like texture by mixing and spinning carbamylethylated protein into viscose. Japanese Examined Patent Publication No. 40-9052 describes a method in which a reaction product of protein and epichlorohydrin is added to viscose and mixed to perform spinning.
The Journal of Textile Society Vol. No. 25, No. 6 (1969) discloses a method in which a reaction product of milk casein and epichlorohydrin is added to viscose and milk casein is grafted onto cellulose via epichlorohydrin using the strong alkalinity of viscose.
[0003]
[Problems to be solved by the invention]
It is known that spinning a mixture of various antibacterial substances viscose order to impart antimicrobial properties to the viscose rayon. For example, chitosan, hinokitiol, quaternary ammonium salt, sulfur, mineral ore and the like are mixed and spun.
However, even if the above-mentioned substance is used as a fiber to be used in direct contact with the human body, some people may cause fogging and itching, and further development of natural antibacterial fibers is desired.
[0004]
[Means for Solving the Problems]
The present inventors have found that when natural proteins are supported on viscose rayon, they have antibacterial properties and have led to the present invention.
That is, the present invention is an antibacterial viscose rayon that is regenerated by extruding viscose mixed with skim milk powder containing natural protein into a regeneration bath.
[0005]
A preferred embodiment of the present invention is viscose rayon in which the amount of natural protein added is 1 to 50 parts by weight per 100 parts by weight of cellulose.
[0006]
The natural protein is preferably casein.
[0007]
The amount of natural protein added is preferably 1 to 50 parts by weight, more preferably 3 to 40 parts by weight, based on 100 parts by weight of cellulose. More preferably, it is 5-20 weight part. If the amount of natural protein added is less than 1 part by weight with respect to 100 parts by weight of cellulose, the antibacterial properties of the resulting fiber are insufficient. On the other hand, when the amount is more than 50 parts by weight, the strength of the fiber is inferior and there is a problem in practicality.
[0008]
The method for producing an antibacterial viscose rayon according to the present invention is characterized in that skim milk powder containing a natural protein is dispersed or dissolved in water or an alkaline aqueous solution, added to and mixed with viscose, extruded into a regeneration bath, and regenerated. .
[0009]
BEST MODE FOR CARRYING OUT THE INVENTION
As the viscose used in the present invention, those for producing ordinary viscose rayon can be used.
The natural protein used in the present invention includes gelatin, collagen, casein, soy protein, sericin, fibroin and the like. Any natural protein can be used, but casein is particularly preferable from the viewpoint of ease of handling and influence on fiber performance.
[0010]
Casein can be used as it is in milk. The addition method to viscose should just add milk to viscose as it is. When a large amount is added, the viscosity of the viscose decreases greatly, so that it is first solidified with an acid, dissolved in an alkaline solution, and adjusted to a predetermined concentration.
Nonfat dry milk can also be used. Nonfat dry milk is dispersed or dissolved in water or an aqueous alkaline solution and added to viscose.
[0011]
The spinning bath for producing the viscose rayon of the present invention is a normal viscose rayon spinning bath. That is, a spinning bath having a sulfuric acid concentration of 70 to 170 g / l, a zinc sulfate concentration of 0 to 50 g / l, and a sodium sulfate concentration of 150 to 350 g / l. The spinning temperature is 45 to 55 ° C. Other manufacturing conditions are also standard conditions.
[0012]
【Example】
(Reference Example) A bismuth having a cellulose content of 8.5% by weight, sodium hydroxide of 5.8% by weight, carbon disulfide of 32% by weight (relative to cellulose weight), falling ball viscosity of 59 seconds and ammonium chloride value of 16 cc. Prepared the course. To the 7000 g of viscose, 1983 g of unadjusted milk (manufactured by Oyama Milk Industry Co., Ltd., protein content: 3.0% by weight) was added as it was (the amount of protein relative to 100 parts by weight of cellulose was 10 parts by weight). After the addition, it was stirred until well mixed. The viscose temperature at this time was 20 ° C. This viscose solution was spun into a spinning bath of 110 g / l of sulfuric acid, 15 g / l of zinc sulfate and 350 g / l of sodium sulfate at a spinning speed of 50 m / min and a draw ratio of 50%, and a viscose rayon having a fineness of 1.7 dtex was obtained. I got a tow. This was cut to a fiber length of 51 mm, desulfurized and bleached.
[0013]
(Example 1 ) 100 g of skim milk powder (manufactured by Snow Brand Access Co., Ltd., protein content: 35 wt%) was dispersed in 250 g of water (protein concentration: 10 wt%), and after sufficient stirring, defoamed. 298 g of this protein dispersion was added to 7000 g of viscose used in the reference example (the amount of protein is 5 parts by weight with respect to 100 parts by weight of cellulose), and the mixture was stirred until fully mixed. This viscose solution was spun in the same manner as in the Reference Example to obtain a viscose rayon having a fineness of 1.7 dtex and a fiber length of 51 mm.
[0014]
(Example 2 ) The same skim milk powder 357g as Example 1 was disperse | distributed to water (protein concentration of 10 weight%), and it defoamed after fully stirring. 1190 g of this protein dispersion was added to 7000 g of viscose used in the reference example (the amount of protein was 20 parts by weight relative to 100 parts by weight of cellulose), and the mixture was stirred until sufficiently mixed. This viscose solution was spun in the same manner as in the Reference Example to obtain a viscose rayon having a fineness of 1.7 dtex and a fiber length of 51 mm.
[0015]
The fiber properties of the viscose rayon of each of the above examples and comparative examples were measured. The measurement is based on the following method.
Tensile strength, elongation rate According to JIS L-1015 chemical staple test method.
Measurement items Dry strength, wet strength, dry elongation, wet elongation antibacterial test According to the unified test method manual established by the New Functional Evaluation Council for Textile Products. Test cells were used yellow grapes spheres bacteria. Evaluation standard is bacteriostatic activity value 2.2 or more. The washing test conformed to JIS L-0217 103 method (detergent used was JAFET standard detergent). The number of washings is 10 consecutive times.
[0016]
The results are shown below.
Reference Example Example 1 Example 2
Amount of protein (parts by weight) with respect to 100 parts by weight of cellulose 10 5 20
Fineness 1.7 1.7 1.7
Dry strength (cN / dtex) 2.02 2.21 1.70
Wet strength (cN / dtex) 1.21 1.32 1.02
Dry elongation (%) 16.5 16.8 14.3
Wet elongation (%) 18.1 17.2 15.0
Bacteriostatic activity value
No laundry 2.6 4.7 4.9
With laundry 2.3 3.2 3.8
[0017]
【The invention's effect】
As shown in the above measurement results, the viscose rayon of the present invention has high antibacterial activity. In addition, since natural proteins are used, they are non-toxic and are very few fibers outside the human body such as fog.
Fabrics and bedding with excellent texture can be obtained from woven fabrics and knitted fabrics. In addition, as a non-woven material, a product having a good texture can be obtained for sanitary materials, medical use, and the like. Furthermore, it can withstand practical use without losing the strength and elongation necessary for the fiber.

Claims (4)

Antibacterial viscose rayon regenerated by extruding viscose mixed with skim milk powder containing natural protein into a regeneration bath. The viscose rayon according to claim 1, wherein the amount of the natural protein added is 1 to 50 parts by weight per 100 parts by weight of cellulose. The viscose rayon according to claim 1 or 2, wherein the natural protein is casein. A method for producing an antibacterial viscose rayon, wherein skim milk powder containing a natural protein is dispersed or dissolved in water or an aqueous alkaline solution, added to and mixed with viscose, extruded into a regeneration bath and regenerated.