JPH06146112A - Double-layer spandex yarn - Google Patents

Abstract

PURPOSE:To obtain the subject spandex yarn usable for various fiber products, having high effect with a low content and high elasticity, comprising an inner layer and an outer layer, containing an adherent functional agent such as antimicrobial agent, deodorant and aromatic in the outer layer. CONSTITUTION:An adherent functional agent such as silver-based inorganic antimicrobial agent is dispersed and blended with a polytetramethylene glycol of 2,000 average-molecular weight and reacted with 4,4'-diphenylmethane diisocyanate at 110 deg.C for 2 hours under stirring to prepare a prepolymer. The prepolymer is heated to 120 deg.C, reacted with tetramethylene glycol under forced stirring and abruptly thickened to form a thermoplastic elastomer. The thermoplastic elastomer is used as an outer layer and a thermoplastic elastomer which is produced by the same conditions of the thermoplastic elastomer but not adding the silver-based inorganic antimicrobial agent is used as an inner layer and both the thermoplastic elastomers are spun by a conjugate spinning method to give the objective double-layer spandex yarn comprising the outer layer (a) containing the adherent functional agent and the inner layer (b) containing no adherent functional agent.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention is to obtain a highly stretchable spandex fiber having a function of antibacterial property, deodorant property, fragrance, etc., which contains a contact functional agent substantially in the outer layer of two layers. This spandex fiber is made of various short fibers, long fibers,
Further, by forming a composite with continuous fibers, various textile products such as woven fabrics and knitted fabrics are obtained, and the above-mentioned various performances are exhibited.

[0002]

2. Description of the Related Art Conventionally, in order to impart various contacting functions to fibers, it has been known that the contacting functional agent is uniformly contained in the artificial fiber.
Here, the contact function means, for example, silver ion released from a silver-based inorganic antibacterial agent has bactericidal properties when contacted with bacteria, aromaticity when perfume molecules contact with olfactory receptors, or malodorous components are airborne. It refers to various functions that are exhibited by molecular / atomic level contact, such as deodorant property that decomposes and becomes odorless by contacting with deodorant together with oxygen in it, and the component that exhibits such performance is called contact functional agent. And In this case, such a contact functional agent is extremely expensive, and further raises the price of the textile product having this kind of function, which is an obstacle to its popularization, so that the desired effect can be obtained in a small amount for cost reduction. The issue was the textile industry.

[0003]

In order to achieve the above-mentioned object, the inventors have studied the distribution of the contact functional agent in the fiber cross section and the effect of expressing the function, and as a result, the contact function present in the central portion of the fiber has been investigated. It was found that the effect of the agent was significantly lower than when it was present on the fiber surface. In particular, in the case of spandex fibers having a substantial fineness of more than 10 denier, it has been revealed that the effect of the contact functional agent present in the central portion hardly contributes to the intended function during the practical life of the fiber. It was Based on the above findings, various methods for preferentially distributing the contact functional agent on the surface layer of the spandex fiber were investigated, and the composite fiber of the spandex fiber was spun into two inner and outer layers,
By adding the desired functional contacting agent only to the outer layer, spandex fibers capable of exhibiting a desired function more effectively than the case where the fibers are evenly distributed over the entire cross section are obtained. Hereinafter, examples of the present invention will be described in detail.

[0004]

Example 1 After dispersing and mixing 5 parts of a silver-based inorganic antibacterial agent (Novalon manufactured by Toagosei Chemical Industry Co., Ltd.) in 100 parts of polytetramethylene glycol (PTMG) having an average molecular weight of 2000, 4,4'-diphenylmethane diisocyanate (M
DI) (28.6 parts) was added, and the mixture was reacted at 110 ° C. for 2 hours with stirring to obtain a prepolymer. 12 of this prepolymer
After the temperature was raised to 0 ° C., 4.73 parts of tetramethylene glycol (TMG) was added under vigorous stirring, the reaction proceeded while rapidly increasing the viscosity, and a thermoplastic elastomer was produced after 15 minutes. (It is called elastomer A.)

The elastomer obtained by adding the silver-based inorganic antibacterial agent under the above-mentioned conditions for producing the elastomer A is used as the elastomer B, the elastomer A is used as the outer layer, and the elastomer B is used as the inner layer by the known composite spinning method. Spin out. In this case, the total fineness was 40 denier and the inner layer portion of the elastomer B was 20 denier. (Hereinafter, referred to as spandex I.) On the other hand, a fiber of 40d is spun with only the elastomer A, and this is referred to as spandex II.

For the antibacterial test, 100 ml of phosphate buffer solution and 1 ml of Escherichia coli solution (bacterial coefficient 1
0 ⁶ ) and 1 g of spandex fiber to it,
The antibacterial property is represented by the reduction rate of the total number of cells after shaking at 25 ° C for 1 hour. If you show the relationship between the number of washings of the sample and the antibacterial property,
It becomes like Table 1.

[Table 1] Although the content of the silver-based inorganic antibacterial agent in Spandex I is 1/2 that of Spandex II, there is no substantial difference in antibacterial properties between them.

[0007]

Example 2 Instead of the silver-based inorganic antibacterial agent at the time of producing the elastomer A in the case of Example 1, a metal phthalocyanine-based deodorant is used.

[Chemical 1] A thermoplastic elastomer obtained by using 5 parts is used as the elastomer C, the elastomer C is used as the outer layer, and the concentric circular conjugate fiber having the elastomer B of Example 1 as the inner layer is prepared according to Spandex I. (Hereinafter, referred to as spandex III.) Further, a 40 denier fiber was spun with only the elastomer C, and this was designated as spandex IV.

For deodorization test, 5 l of air containing 0.5 ppm of dimethyl sulfide was placed in a polyvinylidene chloride bag, and 5 g of sample spandex fiber was placed in the bag.
Leave at 5 ° C for 2 hours. The dimethyl sulfide concentration after 2 hours was determined by the dilution method, and the deodorizing property is expressed by the reduction rate with respect to 0.5 ppm. Table 2 shows the relationship between the number of times the spandex fiber was washed and the deodorant property.

[Table 2] The content of deodorant in Spandex III is Spandex IV.
Although it is 1/2 of that, no substantial difference is observed in the deodorizing properties of both.

[0009]

Example 3 Elastomer D is a thermoplastic elastomer obtained by using 0.01 parts of the fragrance Muscon (aroma component of musk) instead of the silver-based inorganic antibacterial agent at the time of producing the elastomer A in Example 1. A concentric circular conjugate fiber having the elastomer D as the outer layer and the elastomer B of Example 1 as the inner layer is prepared according to Spandex I. (Hereinafter, referred to as spandex V.) A 40 denier fiber was spun with only the elastomer D, and this was designated as spandex VI.

For the fragrance test, 5 g of spandex fiber was placed in a polyvinylidene chloride bag with 5 liters of clean air and left at 25 ° C. for 30 minutes. The fragrance after 30 minutes is measured according to the dilution method, using that of the spandex VI fiber before washing as 100. Table 3 shows the relationship between the number of times the spandex fiber was washed and the aromaticity.

[Table 3] The fragrance of Spandex V shows the same fragrance, even though the fragrance content is 1/2 that of Spandex VI.

[0011]

As described above in detail, the spandex fiber of the present invention can exhibit the same function by adding 1/2 or less the amount of the contact functional agent as compared with the conventional method. . In addition, the spandex fiber of the present invention is used as a core, and various woven / knitted fiber products obtained from yarns using conventional various fibers as a sheath are added to the final product without any special treatment, and the final product is antibacterial and deodorant. A contact function such as fragrance can be imparted.

[0012]

[Brief description of drawings]

FIG. 1 is a cross-sectional view of a two-layer spandex fiber according to the present invention.

FIG. 2 is a cross-sectional view of a conventionally known spandex fiber.

[Explanation of symbols]

 a part containing a contact functional agent b part not containing a contact functional agent

Claims (1)

[Claims] 1. A spandex fiber consisting essentially of two layers, an inner layer and an outer layer, and a contact functional agent in the outer layer.