JPH02229214A - Antimicrobial synthetic fiber and production thereof - Google Patents

Abstract

PURPOSE:To obtain the subject fiber excellent in antimicrobial properties and fastness to washing by mixing a polyamide, etc., in a molten state with a liquid mixture consisting of a fine particulate metal oxide having the surface coated with an antimicrobial metal and a dispersion medium and melt spinning the resultant mixture. CONSTITUTION:A polyamide, polyester and polyolefin in a molten state are blended and mixed with a liquid mixture consisting of a metal oxide having the surface, coated with a metal (e.g. silver, copper or zinc) and having antimicrobial properties and 0.1-5mu preferably 0.3-2mu average particle diameter and a dispersion medium and the resultant mixture is then melt spun to afford the objective fiber containing 0.1-10wt.%, preferably 0.3-5.0wt.% above-mentioned metal oxide.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to an antibacterial synthetic fiber having excellent antibacterial effects and a method for producing the same. (Conventional technology) Synthetic fibers are widely used for clothing and bedding interiors, but in recent years there has been a strong demand for mats and carpet bags used in the sanitary field that have anti-crystal and mold-proof properties. It is coming. Conventionally, methods have been known in which natural or synthetic fibers are coated or sprayed with a compound having antibacterial and antifungal properties, or the fibers are impregnated with a solution of the compound; The drawback is that the drug easily comes off when washed, etc. Furthermore, the method of resin processing using a chemical and resin to impart washing resistance to fibers has the disadvantage of impairing fiber sagility.

Up to now, a method has been developed in which a copper compound or fine metal powder of copper or zinc (such as JP-A-55-115440) is added to synthetic fibers for spinning, but it is difficult to obtain a good dispersion state. In addition to poor spinnability due to agglomeration within the polymer, the contact area with the reel is small, resulting in insufficient antibacterial effect, or has a large effect on the polymer, limiting its usable range. It existed.

The present inventors completed the present invention as a result of intensive research to improve the above drawbacks. (Problems to be Solved by the Invention) The object of the present invention is to provide a synthetic fiber with excellent anti-dentation and anti-mildew properties that has durability such as wash resistance and can be applied to a wide range of fiber processing conditions. ．． Still another object is to provide a method for manufacturing such antibacterial synthetic fibers industrially easily and at low cost.

(Means for Solving the Problems) The antibacterial synthetic fiber of the present invention is a polyamide, polyester, and polyolefin synthetic fiber containing a metal oxide coated with an antibacterial metal on the surface of the polyamide, polyester, and polyolefin synthetic fiber.
It is characterized by containing +oflt%. In addition, the method of the present invention involves mixing polyamide polyester and polyolefin in a molten state with a liquid mixture consisting of a metal oxide whose surface is coated with an antibacterial metal and having an average particle size of 0.1 to 5μ, and a dispersion medium. After that,
This is then melt-spun. Polyamides used in the present invention include nylon 6, nylon 66, and nylon 12, polyesters include polyethylene terephthalate and polybutylene terephthalate, and polyolefins include polyethylene. Examples include polypropylene, and copolymers thereof. Examples of metals having anti-encroachment properties used in the present invention include silver, copper, zinc, etc., and the surface coating is carried out in an amount of 1 to 20% by weight, preferably 3 to 10% by weight, based on the metal oxide particles.
If the amount of coating is less than 1.0% by weight, sufficient antibacterial performance cannot be imparted unless the amount of metal oxide added to the polymer is increased, or spinnability and spinnability in spinning decrease. Moreover, if it exceeds 20% by weight, the surface coating layer will become thick and it will be difficult to manufacture it at a low cost.
Furthermore, coloring when made into textile products becomes a problem.

The amount of the metal oxide whose surface is coated with a metal having antibacterial properties depends on the type of metal and the amount coated on the surface, but it is 0.00 to 100% of the polymer. The content is 1 to 10% by weight, preferably 0.3 to 5.0% by weight. If it is less than 0.1% by weight, sufficient anti-denting properties cannot be imparted to the fibers;
If the weight percentage is exceeded, the fiber performance deteriorates, and the spinnability and spinnability in spinning decrease. Also, the particle size is usually 0.1
~5μm, preferably 0.3~2Itm. When the particle size exceeds 5 μm, the spinnability in spinning and the performance of the obtained fibers decrease.

The dispersion medium used in the method of the present invention includes polyester, polyol, polyester ether. Examples include polyester polyether broccoli copolymer, etc. However, due to stains on the spinneret, decrease in spinnability or physical properties of the fiber, the terminal carboxylic groups are blocked with alcohol, the acid value is 4 or less, and the hydroxyl value is 30 to 50. Polyesters and polyester ethers in the range are preferred. In addition, in order to obtain a liquid mixture when a metal oxide whose surface is coated with a metal having orchid resistance properties is dispersed at a high concentration, it is necessary to obtain a liquid mixture at room temperature and a lower viscosity, for example, 200 It is preferable that the particle size is below Boise.

The liquid mixture usually consists of 5-5'0% by weight of the antibacterial metal oxide and 95-50% by weight of the dispersion medium. Additionally, other additives, such as dyes and pigments and heat-resistant agents, may be added to this liquid mixture. A light stabilizer, a hydrophilic substance, etc. may also be used in combination, and in that case they will be used within a wider range than the above range. The liquid mixture is supplied in a constant quantity using a gear, donb, plunger bomb, etc., and is compressed and blended into the molten thermoplastic polymer. In order to press fit a fixed amount, it is necessary for the liquid mixture to exhibit fluidity from room temperature to molding temperature.
A viscosity higher than ,000 voids is undesirable because it impedes measurement accuracy. Further, it is preferable that the compounding be carried out immediately before the die of each molding head of a molding apparatus used in ordinary melt spinning or melt extrusion, and it is more preferable to make the flow path to the die as short as possible. Furthermore, in order to mix uniformly after blending, it is preferable to use static kneading elements that do not require a driving part, and usually 5 to 60 elements are used. In addition, the antibacterial synthetic fiber of the present invention is prepared by kneading the above-mentioned antibacterial metal oxide with a thermoplastic polymer in an amount of 10 to 80% by weight.
It can also be produced by diluting the antibacterial metal oxide and melt spinning, or by simply dry blending the antibacterial metal oxide with a thermoplastic polymer and melt spinning.

(Effects of the Invention) The antibacterial synthetic fiber of the present invention has an excellent antibacterial effect, has the same fiber performance as ordinary synthetic fiber, and has almost no deterioration in its anti-fouling effect evaluated by washing resistance. Further, the manufacturing method of the present invention allows such fibers to be manufactured industrially easily and in a variety of varieties using ordinary synthetic fiber manufacturing conditions and facilities/equipment.

The fibers obtained according to the present invention can be used in combination with other fibers such as ordinary synthetic fibers, cotton, rayon, wool, etc., and can be used to produce clothing, blankets, and carbide fibers with antibacterial properties.
It is extremely meaningful industrially because it can be used for a wide range of purposes such as cloaks, socks, sheets, and futon cotton.

(Example) The present invention will be specifically explained below with reference to Examples. still,
In the Examples, "%" means "% by weight." Examples 1 to 5 and Comparative Examples Polymerization reaction of adivic acid and diethylene glycol 5j!IJ (viscosity at 75° C. 800 cp, molecular weight 16,000) and 45% titanium oxide surface-coated with silver or copper (coating fi 5.0% average particle size 1.0!Jrn) to prepare a liquid mixture. Next, nylon with a polymerization degree of 180 was mixed. The liquid mixture was added to the melted polymer No. 6 in the amount shown in Table 1 by applying pressure to the melt spinning spout, and the mixture was blended at 1200 ni/min at 224 ni/min.
A denier 24 filament (undrawn type, winding amount 6 kg) was spun. Then, after applying 3 to 2 times stretching and false twisting. Nine volumes were created.

This Akebono was cut into 5 cm square pieces and subjected to an antibacterial test.

(Antibacterial test conditions) Cut the knitted fabric into 5 cm square pieces, add Staphylococcus aureus or Klebsiella pneumoniae buffer solution, and measure the number of viable bacteria after shaking 150 times/min for 1 hour in a closed container. The reduction rate of the suspension due to bacteria was determined. [Judgment of spinning operability] σg overpressure, single yarn breakage,
"◎", 'OJ', "△", "×" for overall thread breakage etc.
It was evaluated on a four-level scale.

Further, the degree of coloring was visually judged in four stages.

As is clear from Table 1, the example products have superior antibacterial performance compared to the comparative example products. Example 6 The fiber obtained in Example 3 was made into nine braids and was washed at home for 0, 5,
10.An antibacterial test was conducted after 20 washes.As shown in Table 2, it showed good antibacterial effects even after 20 washes. Table 2 [Washing conditions] Neutral detergent used in a commercially available small electric washing machine 1g/j! Bath ratio 1:100 temperature
Time 40°C x 5 minutes

Claims (2)

[Claims] (1) An antibacterial synthetic fiber containing 0.1 to 10% by weight of a metal oxide whose surface is coated with an antibacterial metal in a polyamide, polyester, or polyolefin synthetic fiber. (2) After blending and mixing molten polyamide, polyester, and polyolefin with a liquid mixture consisting of a metal oxide having an average particle size of 0.1 to 5μ and a dispersion medium whose surface is coated with a metal having antibacterial properties, A method for producing antibacterial synthetic fibers characterized by melt spinning.