JPH07229063A - Antimicrobial fiber product and its production - Google Patents

Abstract

PURPOSE:To obtain the subject fiber product having safety to the human body, showing antimicrobial properties and moisture retention of excellent permanence by providing a fiber product composed of natural, regenerated or synthetic fiber with a mixture comprising chitosan and zinc oxide. CONSTITUTION:A fiber product composed of natural, regenerated or synthetic fiber is impregnated preferably separately with a deacetylated chitin (chitosan) and finely granulated (<=1.0mum) zinc oxide and a complex of both the components is formed on the fiber product to give an antimicrobial fiber product showing excellent antimicrobial properties, moisture retention and ultraviolet light screening properties without damaging the human body and organisms. The content of the complex (mixture) is 0.02-15wt.% based on the fiber. The degree of deacetylation of the deacetylated chitin is preferably >=50%.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention provides a textile product with multiple functions such as antibacterial property, moisturizing property, and ultraviolet blocking property without damaging the human body or organisms.

[0002]

2. Description of the Related Art Textile products, especially those based on synthetic fibers such as polyester fibers, are safe for the human body,
Moreover, it is not easy to impart durable antibacterial properties, and even though antibacterial agents and antibacterial agents have been used as fiber treatment agents for a long time, no one has achieved satisfactory results. .

Particularly, with the recent emergence of resistant bacteria such as MRSA, antibiotics are not said to be all-antibacterial, and it is necessary to consider such resistant bacteria.

Further, it is necessary to consider the environment, such as the case where a carcinogen, dioxin, is produced when the processed fiber is incinerated like a diphenyl ether type antibacterial agent.

Inorganic compounds such as zeolite silver, ion exchangers of copper or zinc have been attempted as antibacterial agents showing strong antibacterial properties against resistant bacteria and not producing carcinogens. The disadvantage is poor sex.

Zinc oxide has long been applied to infants' skin as a sterilizing desiccant that is harmless to humans and animals, and has a good UV blocking property. However, when it is applied to a textile product, it is likewise resistant to washing. The difficulty is that it is poor in nature.

On the other hand, chitosan organic acid salt is known as a treating agent for textile products and is also known to have some antibacterial properties, but it is not possible to obtain sufficient antibacterial properties.

[0008]

DISCLOSURE OF THE INVENTION The present invention is to improve the above-mentioned drawbacks of the conventional antibacterial fiber product and obtain an antibacterial fiber product having excellent washing resistance and having no obstacle to human body, living organisms and the like. Yes, the purpose is to impart moisturizing properties and ultraviolet blocking properties together.

[0009]

The present invention is a fiber product comprising natural, regenerated or synthetic fibers, which comprises finely divided zinc oxide and deacetylated chitin (hereinafter simply referred to as "chitosan").
A) or a zinc oxide as an essential component. Here, the complex means a salt, a complex salt formed or physically adsorbed.

Examples of the natural, regenerated or synthetic fibers used in the present invention include natural fibers such as cotton, hemp and wool, regenerated fibers such as rayon, synthetic fibers such as polyester, polyamide and polyacrylonitrile. It is used in the form of fibers, threads, woven fabrics, knitted fabrics, non-woven fabrics, papers, etc. by being combined.

The finely divided zinc oxide used in the present invention has an average particle size of 3 to 5 μm or less, preferably 1.0 μm or less. The smaller the particle size, the more stable the suspension state in water, It is possible to perform fiber processing that is uniform and has excellent durability.

The amount of zinc oxide attached to the fiber product is preferably 0.01 to 10% by weight, more preferably 0.1 to 3% by weight. Even if the amount of zinc oxide is too large, the effect does not improve, and there is a drawback that the amount of zinc oxide is large.

The chitosan used in the present invention has a free amino group obtained by deacetylating chitin obtained from crustaceans such as crabs and "mushrooms" with a high concentration of alkali. The degree of conversion is preferably 50% or more.

The above-mentioned chitosan is usually used as an organic acid salt, and as the organic acid, acetic acid, lactic acid, formic acid,
Examples include malic acid and the like.

The amount of chitosan attached to textiles is 0.0
It is preferably 1 to 5% by weight, more preferably 0.1 to 2% by weight. If the amount of adhesion is too large, the fibers will turn yellow and the hand will be hardened. Therefore, the content of the mixture or composite of zinc oxide and chitosan with respect to the fiber is 0.02-
It is preferably 15% by weight.

At least a part of zinc oxide and chitosan forms a complex to form a film having excellent wash resistance on the treated fiber, and the deacetylated chitosan salt has a strong affinity for the fiber. Therefore, an antibacterial fiber having excellent washing resistance can be obtained.

As a means for imparting zinc oxide and a chitosan organic acid salt to the above fiber product, an aqueous solution or water dispersion of both the above agents may be applied by a padding method, a dipping method or the like according to a conventional method. . However, in this case, the chitosan salt concentration is preferably 20% or less and the pH is preferably in the range of 3 to 6. This is a condition under which zinc oxide and chitosan salt form a complex and durability is improved.

Further, it is most preferable that the composite is formed on a textile product in terms of durability, and therefore zinc oxide and chitosan organic acid salt are separately applied to the textile product ( It does not matter in which order), it is preferred to form a complex on the product.

Incidentally, a dye, a fluorescent bleaching agent, an antistatic agent, a softening agent, a texture adjusting agent and the like may be added appropriately along with this treatment.

The textile product of the present invention is not only imparted with excellent washing resistance and antibacterial property, but is also imparted with the ultraviolet ray blocking property of zinc oxide. . In addition, the hygroscopicity of chitosan improves the moisturizing ability, and the pH adjusting function (pH balance) by zinc oxide.
Is imparted, the antistatic property is further increased, and a product which is comfortable to wear can be obtained.

Next, the present invention will be described in more detail with reference to Examples. In the examples, tests for antibacterial properties, moisturizing properties, ultraviolet blocking properties, etc. were carried out by the following methods.

Antibacterial property: A suspension of test bacteria (Staphylococcus aureus) of 1 to 2 × 10 ⁴ / ml was prepared by a shake flask method, and then the viable cell count was measured. Next, after adding 0.75 g of the test piece and shaking at 320 rpm at 25 ° C. for 1 hour,
The viable cell count was measured again, and the sterilization rate was calculated by the following formula.

Moisture retention: Moisture content (1) after leaving the test piece in an atmosphere of 20 ° C. and 65% RH for 48 hours and 20 ° C.,
It was shown by the water content (2) after standing for 60 minutes in an atmosphere of 95% RH.

UV blocking property: spectrophotometer 150-20
(Manufactured by Hitachi Ltd.) was used to measure the ultraviolet transmittance (%) at 310 μm and 365 μm.

Sterilization rate, moisture retention, and UV resistance: Washing resistance: The sterilization rate, moisture retention, and UV protection after 30 times of washing according to the method of JIS L 0217-103, respectively.

Washing resistance of chitosan salt: 1:20 of a 1% by weight aqueous solution of an acid dye (Kayanol Phloxine NK Hodogaya Chemical Co., Ltd.) which reacts with the amino group of chitosan salt on the acidic side.
It is dyed at 100 ° C. for 10 minutes in a dyeing bath having a bath ratio of, and judged by the color density. That is, the color density before washing is set to 5, and color comparison is performed by a gray scale 5-step method. The higher the density, the better the wash resistance.

Example 1 The following three kinds of sample cloths were respectively scoured and hydrogen peroxide bleached according to a conventional method and then padded (squeeze ratio 100%) with a solution having the following formulation, and then at 100 ° C. for 2 minutes. Dried 1
Heat treatment was performed at 20 ° C. for 2 minutes.

Test cloth (1) 30-count cotton thread using knitted fabric (test cloth (1)) (2) polyester / cotton blended spinning (blending ratio 60:40) 3
Tenjiku circular knitted fabric using No. 0 yarn (test cloth (2)) (3) 100% polyester Tenjiku circular knitted fabric using No. 30 yarn (test cloth (3))

Prescription Chitosan acetate * 0.5% by weight Zinc oxide * 0.3% by weight * Acetate of chitosan with 48% deacetylation (48%
%) 1: 1 solution ** Average particle size 0.1-0.9μ, 30% slurry

Similar to Example 1, the test cloth (2) was used as Comparative Example 1 and only 0.5 wt% of chitosan acetate was used and Comparative Example 2 was 0.3 wt% of zinc oxide. Was processed.

With respect to the obtained treated cloth, antibacterial property, washing resistance, moisture retention property and ultraviolet ray blocking property were measured. The results are shown in Tables 1 and 2.

[0032]

[Table 1]

[0033]

[Table 2]

Further, the test cloth was dipped in each of the liquids having pHs of 4, 5, 8 and 11 and taken out from the bath.
When H was measured, it was found that the pH balance was good when the pH was around 7.

Example 2 The following three kinds of test cloths were respectively scoured and bleached with hydrogen peroxide according to a conventional method, and then padded (squeezing ratio 100%) with a solution having the following formulation, and 100 ° C. for 2 minutes. Dried
Heat treatment was performed at 120 ° C. for 2 minutes.

Test Cloth (1) 30-count cotton threaded knitted fabric knitted fabric (test cloth (4)) (2) Polyester long fiber, cotton fiber composite yarn used knitted cloth circular knitted fabric (test cloth (5)) (3) Tenjiku circular knitted fabric with 100% polyester and 30th spun yarn (test cloth (6))

Formulation First pad bath Zinc oxide * 0.3% by weight Second pad bath Chitosan acetate ** 0.5% by weight * 30% by weight slurry with an average particle size of 0.1-0.9 μ ** Deacetylation Acetate of chitosan with a degree of conversion of 80% (48
%) 1: 1 solution

Further, using a test cloth (5), zinc oxide 0.3
An example in which one bath padding treatment was performed in a bath containing wt% and chitosan acetate 0.5 wt% was also performed.

The results of measuring antibacterial properties, washing resistance, moisturizing properties, and UV blocking properties of the obtained treated cloths are shown in Tables 3 and 4.
It is as follows.

[0040]

[Table 3]

[0041]

[Table 4]

As is clear from the results shown in Tables 3 and 4, excellent durability was observed in all of antibacterial properties, moisturizing properties and ultraviolet blocking properties. Further, it can be seen that the durability of the two-bath treatment is slightly higher than that of the one-bath treatment.

Claims (4)

[Claims] 1. An antibacterial fiber product comprising natural, regenerated or synthetic fibers, which contains a mixture or complex containing deacetylated chitin and zinc oxide as essential components. 2. The antibacterial fiber product according to claim 1, wherein the deacetylation degree of the deacetylated chitin is 50% or more. 3. The content of the mixture or composite according to claim 1 with respect to the fiber is 0.02 to 15% by weight.
The described antibacterial textile product. 4. A method for producing an antibacterial fiber product, which comprises adding a mixture or complex of fine particulate zinc oxide and a deacetylated chitin organic acid salt to a fiber product comprising natural, regenerated or synthetic fibers.