JP5786349B2 - Deodorant knitted fabric - Google Patents

Description

  The present invention relates to a deodorant knitted fabric that suppresses discomfort due to body odors such as sweat odor and aging odor generated from the human body and does not deteriorate the deodorizing performance due to washing.

  Many fiber products that prevent body odor such as sweat have been commercially available. Although sweat does not become a strong odor by itself, the sweat component becomes various unpleasant odor components by being converted into lower fatty acids or volatile substances by the action of various bacteria present on the skin. Typical examples of odor components include acetic acid, isovaleric acid, and ammonia. In recent years, products for preventing aging odor peculiar to middle-aged and elderly people have been proposed. Aging odor is an odor that grows with age, and it contains nonenal and acetic acid, isovaleric acid, ammonia, etc. produced by oxidation of fatty acids secreted from the skin and decomposition by bacteria on the skin. Generated by mixing.

  As a countermeasure against these unpleasant odor components, there are sprays and creams containing antiperspirants, deodorants, masking agents, etc., but these products do not have a deodorant effect. Many textile products with a deodorizing function are commercially available. For example, there are those in which a deodorizing substance is adhered and fixed to the fiber surface by post-processing, those in which a deodorizing substance is kneaded at the fiber production stage, or those in which a deodorizing function is imparted by modifying the fiber. However, these textile products are not satisfactory because their performance is deteriorated by washing or only effective for specific odor components.

  In addition, for example, a deodorizing fiber containing fine particles of a composite metal oxide having photocatalytic activity has been proposed (Patent Document 1). According to this deodorizing fiber, the bad odor component is decomposed by the photocatalyst, and thus the performance by washing. Although there is no problem of deterioration, the deodorizing function is not exhibited in an environment where light does not reach, and further, the photocatalyst decomposes the base fiber itself, which causes problems such as discoloration of the fiber and a decrease in strength.

  Furthermore, there has been proposed a fiber product containing a fiber containing metal fine particles having photocatalytic activity and a fiber having a deodorizing function by chemical or physical adsorption (Patent Document 2). This fiber product has a very high deodorizing performance because it can chemically and physically adsorb malodorous components and decompose the malodorous components by photocatalysis, but still has the above-mentioned problems. Yes.

The gist of the present invention is a sea-island type acrylic composite comprising 10 to 40% by mass of cellulose acetate and 90 to 60% by mass of acrylonitrile-based polymer, wherein the island is formed of cellulose acetate and the sea is formed of acrylonitrile-based polymer. A knitted fabric comprising a fiber (A) and a viscose rayon (B) containing a carboxylic acid or a salt thereof, wherein 20-80% by mass of a sea-island type acrylic composite fiber (A), viscose rayon ( B) is contained in an amount of 80 to 20% by mass, the deodorization rate for acetic acid is 80% or more in the knitted fabric before and after 10 washings, the deodorization rate for isovaleric acid is 85% or more , and the deodorization rate for Nonenal. Is in a deodorant knitted fabric having a deodorization rate of 75% or more with respect to ammonia of 70% or more.

The object of the present invention is to eliminate the unpleasant sensation caused by body odor by deodorizing sweat odor and aging odor generated from the human body, and underwear that does not deteriorate the deodorizing function due to washing, and a deodorant knitting suitable for inner use. To provide the ground.

  The gist of the present invention is a sea-island type acrylic composite comprising 10 to 40% by mass of cellulose acetate and 90 to 60% by mass of acrylonitrile-based polymer, wherein the island is formed of cellulose acetate and the sea is formed of acrylonitrile-based polymer. A knitted fabric comprising a fiber (A) and a viscose rayon (B) containing a carboxylic acid or a salt thereof, wherein 20-80% by mass of a sea-island type acrylic composite fiber (A), viscose rayon ( B) is contained in an amount of 80 to 20% by mass, the deodorization rate with respect to acetic acid in the knitted fabric before and after 10 washings is 80% or more, the deodorization rate with respect to isovaleric acid is 85%, and the deodorization rate with respect to nonenal. The deodorant knitted fabric has 75% or more and a deodorization rate with respect to ammonia of 70% or more.

  According to the present invention, the deodorant knitted fabric of the present invention comprises a sea-island type acrylic composite fiber (A) in which the island part is formed of cellulose acetate and the sea part is formed of an acrylonitrile polymer, and a carboxylic acid or a salt thereof. Even if it is a knitted fabric comprising viscose rayon (B), the fibers (A) and (B) constituting the knitted fabric deodorize unpleasant odors such as sweat odor and aging odor, and repeated washing There is no deterioration in the deodorizing function, and a material suitable for underwear, innerwear, etc. can be provided.

Hereinafter, embodiments of the present invention will be described in detail.
The deodorant knitted fabric of the present invention is composed of 10 to 40% by mass of cellulose acetate in which an island part in a sea-island type composite structure composed of a plurality of island parts and a sea part is formed of cellulose acetate, and the sea part is formed of an acrylonitrile-based polymer. And a sea-island type acrylic composite fiber (A) comprising 90 to 60% by mass of an acrylonitrile polymer and a viscose rayon (B) containing a carboxylic acid or a salt thereof.

  In the present invention, the sea-island type acrylic composite fiber (A) constituting the knitted fabric is composed of cellulose acetate as the island component and acrylonitrile-based polymer as the sea component. It is necessary to be comprised from 90 mass% and acrylonitrile-type polymer 90-60 mass%. The sea-island acrylic composite fiber is composed of 10 to 40% by mass of cellulose acetate and 90 to 60% by mass of acrylonitrile polymer, thereby making it possible to exert a sufficient deodorizing function against odor components. When the cellulose acetate is preferably composed of 20 to 40% by mass and acrylonitrile-based polymer 80 to 60% by mass, the fiber properties are not lowered and high deodorizing performance is exhibited.

  As a cellulose acetate which forms the island part of the sea-island type acrylic composite fiber (A) in the present invention, a cellulose diacetate having an average acetylation degree of 48.8% or more and less than 56.2%, and an average acetylation degree of 56. Examples include cellulose triacetate of 2% or more and less than 62.5%.

  The acrylonitrile polymer forming the sea part of the sea-island acrylic composite fiber (A) is preferably a copolymer of acrylonitrile containing 80% by mass or more of acrylonitrile and an unsaturated monomer copolymerizable with acrylonitrile. It is a polymer. The unsaturated monomer copolymerizable with acrylonitrile is not particularly limited. For example, acrylic acid, methacrylic acid, vinyl acetate, acrylamide, methacrylamide, vinyl chloride, vinylidene chloride, sodium vinylbenzenesulfonate, methacrylsulfonic acid Examples thereof include sodium and sodium acrylamidomethylsulfonate.

  In the sea-island type acrylic composite fiber (A), in the cross section (fiber cross section) perpendicular to the longitudinal direction of the fiber, the island part is formed of cellulose acetate and the sea part is formed of acrylonitrile polymer. is necessary. By adopting a sea-island type composite structure in which the fibers are covered, the fibers are reinforced by covering the periphery of cellulose acetate, which is weak in fiber properties, with the result that the fibers are reinforced, and as a result, the fibers have the same physical properties as those of ordinary acrylic fibers. Become fiber.

  In the sea-island type composite structure in the fiber cross section, it is preferable that the cellulose acetate as an island component is continuously or partially continuous along the entire length in the longitudinal direction of the fiber. A structure having pores inside the fiber may be used, and a structure having pores inside the fiber is preferable for expressing the deodorizing performance. In the sea-island type acrylic composite fiber in the present invention, There is a tendency that pores are formed at the interface between the cellulose acetate in the part and the acrylonitrile polymer in the sea part. The sea-island type acrylic composite fiber (A) has a single fiber fineness of 0.8 to 3.3 dtex in order to exhibit deodorant performance and from the texture and spinning required for inner use. It is preferable.

  The sea-island acrylic composite fiber (A) in the present invention can be produced, for example, as follows. First, a spinning dope comprising cellulose acetate, an acrylonitrile polymer and a solvent is prepared. The solvent is not particularly limited as long as it is a solvent that simultaneously dissolves cellulose acetate and acrylonitrile-based polymer. For example, nitric acid aqueous solution, zinc chloride aqueous solution, rhodan salt aqueous solution, dimethylformamide, dimethylacetamide, dimethylsulfoxide, ethylene Examples include carbonate, propylene carbonate, γ-butyrolactone, and acetone. Spinning is performed by forming a spinning dope into a fiber form by wet spinning, which is discharged into a coagulation bath made of an aqueous solution of the solvent using a normal spinneret, to obtain an undrawn yarn. Stretched 7 times to make drawn yarn, treated with solvent removal, oiling, drying relaxation, etc., and cut the filament with a single fiber fineness of 0.8-3.3 dtex into a predetermined fiber length. Get as.

  In the present invention, the viscose rayon (B) constituting the knitted fabric is a viscose rayon containing a carboxylic acid or a salt thereof. Examples of carboxylic acids and salts thereof include saturated carboxylic acids such as palmitic acid and stearic acid, unsaturated carboxylic acids such as oleic acid and linoleic acid, aromatic carboxylic acids such as terephthalic acid, and hydroxy acids such as lactic acid and tartaric acid. Or a metal salt thereof such as sodium or potassium.

  The content of the carboxylic acid or salt thereof in the viscose rayon is preferably in the range of 0.2 to 10% by mass, and the inclusion is carried out by kneading into the so-called viscose. If the content of the carboxylic acid or its salt is in the range of 0.2 to 10% by mass, sufficient odor eliminating performance is exhibited in the knitted fabric constructed with the sea-island acrylic composite fiber (A), No dropout or elution occurs in post-processes such as spinning process of viscose rayon or dyeing after knitting. The viscose rayon (B) containing a carboxylic acid or a salt thereof in the present invention has a single fiber fineness from the viewpoint of exhibiting deodorizing performance, and through the process required for inner use such as texture and spinning. It is preferably 0.5 to 3.3 dtex.

The viscose rayon (B) containing a carboxylic acid or a salt thereof in the present invention may be a product marketed as a commercial product, and can be produced, for example, as follows. First, a viscose solution is prepared by adding a solution containing a carboxylic acid or a salt thereof and an aqueous caustic soda solution to a viscose stock solution containing cellulose. The carboxylic acid or viscose solution obtained by adding a salt thereof is spun into a coagulation playback bath consisting of sulfuric acid and an aqueous solution of zinc sulfate by using a spinneret, the single fiber fineness and fiber bundles 0.5～3.3Dtex, Further, it is cut into a predetermined fiber length to obtain short fibers.

  The knitted fabric of the present invention is not particularly limited in the knitted fabric of the knitted fabric as long as it includes the sea-island acrylic composite fiber (A) and the viscose rayon (B). For example, it is preferable to have a flat knitted structure such as smooth, milling, and tengu.

  The sea-island acrylic composite fiber (A) and the viscose rayon (B) in the knitted fabric of the present invention are 20 to 80% by mass, preferably 30 to 80% by mass, of the sea-island acrylic composite fiber (A) in the knitted fabric. Viscose rayon (B) is contained in an amount of 80 to 20% by mass, preferably 70 to 20% by mass. If the sea-island acrylic composite fiber (A) and the viscose rayon (B) are contained in such a range, other fiber materials such as cotton (= cotton), natural fibers such as wool, Synthetic fibers such as polyester fibers, nylon fibers, and urethane fibers may be contained. Particularly, cotton has a deodorizing function for acids such as acetic acid and isovaleric acid, and is preferably used in combination.

  When knitting the knitted fabric, the sea-island type acrylic composite fiber (A) and viscose rayon (B) can be blended and used as a spun yarn. The material can be easily knitted, which is preferable in knitting the knitted fabric. In knitting the knitted fabric, a spun yarn of sea-island type acrylic composite fiber (A) and a spun yarn of viscose rayon (B) may be used, and these spun yarns may be knitted to form a knitted fabric. By using the ground, it is possible to express a border pattern or the like by dyeing with dyeing.

The knitted fabric of the present invention is composed of the sea-island acrylic composite fiber (A) and the viscose rayon (B) as essential constituent fabric materials , so that before washing and after washing 10 times according to JIS L0217 103 method. Deodorizing performance of 80% or more for acetic acid in knitted fabric, 85% or more for devaleric acid, 75% or more for Nonenal, and 70% or more for ammonia The knitted fabric of the present invention is characterized by having such a deodorizing performance.

  In the present invention, viscose rayon was originally known to have a high hygroscopic property and a relatively high deodorizing ability for acid odors and basic odors. Since it is lower than the capacity, a viscose rayon containing 0.2 to 10% by mass of carboxylic acid or a salt thereof by kneading carboxylic acid or a salt thereof into viscose, and having a deodorizing capacity of 70 in terms of a deodorizing rate. % Viscose rayon (B) containing a carboxylic acid or a salt thereof, which is improved to at least%, is an essential constituent yarn of the knitted fabric.

  Further, in the present invention, when the acrylic fiber includes a plurality of pores in its fiber structure, it has been conventionally known that the acrylic fiber has a deodorizing ability with respect to acetic acid, isovaleric acid and nonenal which are odor components. Since the acrylic fiber is a sea-island type composite fiber and the island portion is formed of cellulose acetate, the deodorization rate for acetic acid is 80% or more, the deodorization rate for isovaleric acid is 85%, and the deodorization rate for Nonenal is 75%. %, The sea-island type composite fiber is used as the essential constituent yarn of the knitted fabric as the sea-island type acrylic composite fiber (A).

  Hereinafter, the present invention will be specifically described by way of examples. In addition, evaluation of the deodorizing performance in an Example was based on the following method.

(Evaluation of deodorant performance)
The samples before washing and washing after JIS L0217 103 method were performed 10 times, and the samples after drying by hanging and drying were evaluated for the following deodorant performance.
[Evaluation of deodorization performance of acetic acid and ammonia (detector tube method)]
In a Tedlar pack, put a sample (was 2.4 g, a piece of knitted fabric 10 cm long x 10 cm wide), put 3 liters of odor gas so that the initial concentration of acetic acid is 50 ppm and the initial concentration of ammonia is 100 ppm, The concentration of each odor component after 2 hours was measured with a detector tube, the reduction rate of each odor component concentration was calculated by the following formula, and this reduction rate was defined as the respective deodorization rate.
Reduction rate (%) = [(Blank test concentration after 2 hours−Sample test concentration after 2 hours) / 2 Blank test concentration after 2 hours] × 100

[Evaluation of deodorizing performance of isovaleric acid and nonaneru (gas chromatography method)]
Place a sample (was 1.2 g, knitted fabric is 6 cm long x 8 cm wide) into a 500 ml Erlenmeyer flask, so that the initial concentration of isovaleric acid is 38 ppm and the initial concentration of nonaneru is 14 ppm. 2 hours after dropping the component solution and sealing, sample the gas in the flask with a syringe, measure the peak area with a gas chromatograph, calculate the decrease rate of each odor component concentration by the following formula, this decrease The rate was defined as each deodorization rate.
Reduction rate (%) = [(blank test peak area after 2 hours−sample test peak area after 2 hours) / 2 blank test peak area after 2 hours] × 100

Example 1
A sea-island acrylic composite fiber composed of 30% by mass of cellulose diacetate and 70% by mass of an acrylonitrile-based polymer (A made by Mitsubishi Rayon Co., Ltd.) formed of cellulose diacetate in the island and acrylonitrile-based polymer mainly composed of acrylonitrile in the sea. H. F, single fiber fineness 1.7 dtex, fiber length 51 mm) (A), carboxylic acid-containing viscose rayon (PARAMOS manufactured by Daiwabo Rayon Co., Ltd., single fiber fineness 0.9 dtex, fiber length 38 mm) (B), A spun yarn having a hair count of 1/68 was obtained by blending at a blending ratio of (A) 60% by mass and (B) 40% by mass. The obtained spun yarn was knitted into a milled knitted fabric with a 22 gauge circular knitting machine. The evaluation results of the deodorizing performance of the obtained knitted fabric are shown in Table 1. In addition,% of the fiber content rate in Table 1 means the mass%.
In addition, the deodorization rate before washing of the acrylic composite fiber (A) alone was 94.0% acetic acid, 93.0% isovaleric acid, 91.2% nonenal, and 9.8% ammonia, and viscose rayon. (B) The deodorization rate before washing of the simple substance was 95.2% acetic acid, 56.8% isovaleric acid, 14.5% nonenal, and 98.5% ammonia.

(Example 2, Comparative Examples 1-3)
The same sea-island type acrylic composite fiber short fiber (A), viscose rayon short fiber (B) and cotton used in Example 1 were used, and the spun yarn was obtained by changing the blending rate. Table 1 shows the evaluation results of the deodorizing performance of the knitted fabric obtained by knitting in the same manner as in Example 1 except that the obtained spun yarn was used. In Example 2, (A) 50% by mass, (B) 30% by mass, cotton 20% by mass, and Comparative Example 1 has (A) 55% by mass, cotton 45% by mass, and comparison In Example 2, the blending rate was 50% by mass of (B) and 50% by mass of cotton, and in Example 3, the blending rate was 20% by mass of (A), 13% by mass of B, and 67% by mass of cotton.

(Example 3)
The same sea-island type acrylic composite fiber short fiber (A) and viscose rayon short fiber (B) as used in Example 1 are mixed with a 1/68 spun yarn, and a cotton count 40/100% cotton. 1 spun yarn was used and knitted into a knitted fabric of a knitting milling structure of mixed spun yarn 1 / cotton spun yarn 1 with a 22 gauge circular knitting machine. The evaluation results of the deodorizing performance of the obtained knitted fabric are shown in Table 1.

(Comparative Example 4)
In Example 3, the blended spun yarn 1 / cotton spun yarn 2 was changed to the knitted fabric mixing ratio shown in Table 1, and knitted into a knitted fabric of a knitting milling structure. The evaluation results of the deodorizing performance of the obtained knitted fabric are shown in Table 1.

Example 4
The same sea-island acrylic composite fiber short fiber (A) as used in Example 1 and a spun yarn with a hair count of 1/68 consisting of 100%, and the same viscose rayon short fiber (B) as used in Example 1, 50% by mass. And a spun yarn of 40/1 cotton blend of 50% by mass of cotton and knitted into a knitted fabric of an knitting milling structure of spun yarn 1 / cotton blend spun yarn 1 with a 22 gauge circular knitting machine. The evaluation results of the deodorizing performance of the obtained knitted fabric are shown in Table 1.

  The deodorant knitted fabric according to the present invention, the sea-island type acrylic composite fiber constituting the knitted fabric and the carboxylic acid or its salt-containing viscose rayon fiber deodorizes unpleasant odors such as sweat odor and aging odor, Even after repeated washing, the deodorizing function does not deteriorate, and it is useful as a material suitable for underwear, innerwear, etc. In addition, it is extremely useful as a material in the clothing field requiring deodorizing performance.

Claims (3)

A sea-island type acrylic composite fiber (A) composed of 10 to 40% by mass of cellulose acetate and 90 to 60% by mass of acrylonitrile-based polymer, wherein the island part is formed of cellulose acetate and the sea part is formed of acrylonitrile-based polymer, A knitted fabric comprising a viscose rayon (B) containing a carboxylic acid or a salt thereof, wherein 20 to 80% by mass of sea-island type acrylic composite fiber (A) and 80 to 20 viscose rayon (B). Containing 80% by mass, the deodorization rate for acetic acid in the knitted fabric before and after washing 10 times is 80% or more, the deodorization rate for isovaleric acid is 85% or more , the deodorization rate for Nonenal is 75% or more, ammonia Deodorant knitted fabric with a deodorization rate of 70% or more. A sea-island acrylic composite fiber comprising 10 to 40% by mass of cellulose acetate and 90 to 60% by mass of acrylonitrile-based polymer (the island part is formed of cellulose acetate and the sea part is formed of acrylonitrile-based polymer) The deodorant knitted fabric according to claim 1, which is a knitted fabric comprising a spun yarn in which A) and a viscose rayon (B) containing a carboxylic acid or a salt thereof are blended. A sea-island acrylic composite fiber comprising 10 to 40% by mass of cellulose acetate and 90 to 60% by mass of acrylonitrile-based polymer (the island part is formed of cellulose acetate and the sea part is formed of acrylonitrile-based polymer) The deodorant knitted fabric according to claim 1, which is a knitted fabric comprising a spun yarn of A) and a spun yarn of viscose rayon (B) containing a carboxylic acid or a salt thereof.