JPH11229238A - Antimicrobial bulky polyester yarn - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain an antimicrobial bulky polyester yarn having excellent antimicrobial properties and bulkiness. SOLUTION: This antimicrobial bulky polyester yarn is a yarn obtained by arranging two kinds of polyesters different in melt viscosity side by side. The melt viscosities of the two kinds of the polyesters satisfy equation I: 2.4<=η melt (A)/η melt (B)<=6.0 and equation II: 1,600<=η melt (A) with the proviso that η melt (A) is the melt viscosity (poise) of a high melt-viscosity component and η melt (B) is the melt viscosity (poise) of a low melt-viscosity component. The yarn contains 0.1-20 wt.% of an inorganic antimicrobial agent only in the low-viscosity polyester component and has <=100 cm<3> /g specific volume at the initial load of the yarn and 20-40 cm<3> /g specific volume at heavy load.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to an antibacterial bulky polyester fiber having good antibacterial properties and bulkiness.

[0002]

2. Description of the Related Art Polyesters represented by polyethylene terephthalate have been used in a wide range of fields because of their excellent physical and chemical properties. In recent years, with the diversification of consumers' values and the increasing awareness of hygiene, the demand for polyester fibers having various functions has been increasing, and various antibacterial fibers have been put to practical use.

[0003] As an example, as a fiber having an antibacterial agent immobilized by a post-processing method, there is a fiber provided with a silicon-based quaternary ammonium salt or a fiber provided with an aliphatic quaternary ammonium salt. However, these have a drawback that the antibacterial property is reduced by washing, friction, and abrasion because only the antibacterial agent is fixed to the fiber surface.

Further, Japanese Patent Application Laid-Open No. S59-133235,
JP-A-63-54103 and JP-A-63-175
No. 117 discloses a polyester fiber obtained by mixing antibacterial silver zeolite with polyester and melt-spinning. Synthetic fibers containing antibacterial zeolite have good antibacterial and deodorant performance and excellent durability, but since the whole yarn or the sheath side of the core-in-sheath composite fiber contains an antibacterial agent, it can be stretched or stretched after melt spinning. Even after heat treatment, spontaneous spiral crimping was unlikely to occur, and did not have sufficient bulkiness.

[0005]

SUMMARY OF THE INVENTION The present invention has been made to solve the above problems, and has as its object to provide an antibacterial bulky polyester fiber having good antibacterial properties and bulkiness.

[0006]

Means for Solving the Problems The present inventors have made intensive studies to solve the above-mentioned problems, and as a result, have reached the present invention.
That is, the present invention relates to a polyester fiber in which two types of polyesters having different melt viscosities are arranged in a side-by-side type, wherein the melt viscosities of the two polyesters satisfy the following formula, and only the low melt viscosity polyester component has an inorganic antibacterial property. An antimicrobial agent containing 0.1 to 2.0% by weight of the fiber weight, wherein the specific volume of the fiber at the initial load is 100 cm ³ / g or more, and the specific volume at the heavy load is 20 to 40 cm ³ / g. The present invention is based on a high bulk polyester fiber. 2.4 ≦ ηmelt (A) / ηmelt (B) ≦ 6.0 (1) 1600 ≦ ηmelt (A) (2) where ηmelt (A) is the melt viscosity of the high melt viscosity component.
(poise) ηmelt (B): melt viscosity of the low melt viscosity component (poi)
se)

[0007]

BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, the present invention will be described in detail. The antibacterial bulky polyester fiber of the present invention is a conjugate fiber in which two types of polyesters having different melt viscosities are arranged in a side-by-side type. By adopting such a form, after the melt spinning, drawing or heat treatment is performed. , Spontaneous spiral crimps to form bulky fibers.

First, the antimicrobial bulky polyester fiber of the present invention is a polyester fiber in which two types of polyesters having different melt viscosities are arranged in a side-by-side type. As the polyester to be used, both high melt viscosity and low melt viscosity components are used. , Polyalkylene terephthalate and polyalkylene naphthalate, specifically, polyethylene terephthalate (PET) and polybutylene terephthalate (PBT).

These may contain a small amount of a copolymer component. Examples of the copolymer component include aromatic dicarboxylic acid components such as 5-sodium sulfoisophthalic acid, isophthalic acid, phthalic anhydride, and naphthalenedicarboxylic acid; Aliphatic dicarboxylic acid components such as adipic acid and sebacic acid, glycol components such as diethylene glycol, propylene glycol, 1,4-cyclohexanedimethanol, and alkylene oxide adducts of bisphenol S, and hydroxys such as 4-hydroxybenzoic acid and ε-caprolactone And a carboxylic acid component.

[0010] Only the low melt viscosity component contains an inorganic antibacterial agent. This is because the low melt viscosity component is drawn and heat-treated, and when spiral crimping occurs, it becomes the surface side of the fiber, and the antibacterial agent is exposed on the fiber surface, so that the fiber has good antibacterial properties. This is because it can be done. As a component of the antibacterial agent, an inorganic antibacterial agent exhibiting good antibacterial properties with few problems in production such as heat resistance is effective, and in particular, the main components are silver zeolite, silver zirconium phosphate, calcium silver phosphate, Either zinc oxide or titanium oxide or a combination thereof is preferred.

[0011] The content of the antibacterial agent is 0.1 to 0.1% of the fiber weight.
2.0% by weight. If the amount is less than 0.1% by weight, the antibacterial performance is insufficient, and if the amount exceeds 2.0% by weight, operability such as thread breakage during spinning and clogging of the polymer filtration filter becomes severe. The antimicrobial agent may be added to the low melt viscosity component at the time of polymerizing the raw material polyester, or may be added at the time of melting the polyester during the spinning process and uniformly kneaded and dispersed.

As described above, the antibacterial bulky polyester fiber of the present invention undergoes spontaneous spiral crimping when subjected to stretching or heat treatment after melt spinning, resulting in a bulky fiber. The onset of the spiral crimp is highly related to the viscosity of the two polyester components arranged in a side-by-side type. Therefore, the melt viscosity of the two polyester components [the melt viscosity (poise) of the high melt viscosity component: ηmel
t (A), melt viscosity (poise) of low melt viscosity component: ηme
lt (B)] must be as follows. 2.4 ≦ ηmelt (A) / ηmelt (B) ≦ 6.0 (1) 1600 ≦ ηmelt (A) (2)

That is, the ratio [η melt (A) / η melt (B)] of the high melt viscosity component to the low melt viscosity component is 2.
If it is less than 4, spontaneous spiral crimping will be insufficient,
Satisfactory bulky fibers cannot be obtained. On the other hand, if this ratio exceeds 6.0, kneading during melt spinning becomes severe, and the spun polymer adheres to the die plate, so that spinning cannot be performed, or even if spinning can be performed, yarn breakage occurs frequently, or 2 It cannot be a side-by-side type fiber in which the components are properly bonded.

The melt viscosity of the high melt viscosity component is 160
If it is less than 0, spontaneous spiral crimping will be insufficient, and satisfactory bulky fibers cannot be obtained, or yarn breakage will occur during spinning, resulting in poor operability.

Since the high melt viscosity component and the low melt viscosity component are bonded so as to form a side-by-side type, the cross-sectional area ratio is usually 1: 1.
It may be about 7 to 7: 3.

The polyester fiber of the present invention becomes a bulky fiber when stretched and heat-treated by setting the melt viscosities of the two types of polyester components as described above. Has a specific volume at initial load of 100 cm ³ / g or more, and a specific volume at heavy load of 20 to 4
It is a fiber of 0 cm ³ / g. As described above, since the fiber is a spontaneously formed spiral crimp, it retains sufficient bulkiness than a fiber that is mechanically crimped by a commonly used stuffer box or the like. ing. The specific volume under initial load and the specific volume under heavy load are calculated as follows.

First, the polyester fiber of the present invention, which has been subjected to drawing and heat treatment to exhibit crimp, is cut into short fibers of a predetermined length, and opened using CH-500 manufactured by Daiwa Kiko Co., Ltd. The fibers are stacked in a size of 20 cm × 20 cm and weighing 80 g. A 170 g board (20 cm × 20 cm) is placed on the plate, and the fiber height at that time is defined as A (cm). Then, a load of 5230 g is applied and left for 5 minutes. Thereafter, the load is removed and the apparatus is left for 5 minutes. This operation is repeated five times. Thereafter, a load of 230 g was applied and left for 5 minutes.
Apply a load of 00 g to make 5230 g and leave for 5 minutes. The height at that time is defined as B (cm), and the height is calculated by the following equation. Specific volume at initial load (cm ³ / g) = (20 × 20 × A) / 80 =
5A Specific volume at heavy load (cm ³ / g) = (20 × 20 × B) / 80 =
5B

If the specific volume at initial load is less than 100 cm ³ / g, a large amount of fiber is required to obtain a bulky fiber product using this fiber, which leads to an increase in cost and weight. Can not. Specific volume at heavy load is 20cm
If it is less than ³ / g, the fiber product obtained using this fiber has a low compression rebound, and immediately sets when used. When the specific volume under heavy load exceeds 40 cm ³ / g, a fiber product obtained using this fiber has no cushioning property.

The antibacterial bulky polyester fiber of the present invention comprises:
Opening as short fiber, making wadding or non-woven fabric,
It may be used as a spun yarn, or it may be made into a long fiber, knitted and woven and made into a fabric.

The process for producing the antibacterial bulky polyester fiber of the present invention is carried out by melt-spinning a low melt viscosity component containing an antibacterial agent and a high melt viscosity component using an ordinary composite spinning apparatus, followed by drawing or heat treatment. A two-step method of once winding and then drawing and heat-treating after melt-spinning, or a one-step method of drawing and heat-treating after melt-spinning without winding once may be used.

The spinning, drawing and heat treatment conditions for the one-step method and the two-step method are not particularly limited, but the spinning speed is 1000 m / s from the viewpoint of spontaneous spiral crimping.
Min.
It is preferable to perform the heat treatment at about 3.7 times.
It is preferable to carry out at about ° C.

[0022]

In the antibacterial bulky polyester fiber of the present invention, two types of polyesters are arranged in a side-by-side type, and the relationship between the melt viscosity of the high melt viscosity component and the melt viscosity of the low melt viscosity component is within a specific range. By performing stretching or heat treatment later, spontaneous spiral crimps are developed, and the fiber has sufficient bulkiness. Furthermore, the low melt viscosity polyester component contains an antimicrobial agent, and the low melt viscosity polyester component becomes the surface side of the fiber when spiral crimping occurs, the antimicrobial agent is exposed on the fiber surface, and has good antibacterial properties Become fibers.

[0023]

Next, the present invention will be described specifically with reference to examples. In addition, the measurement of the characteristic value in an Example was performed as follows. [Melt viscosity] Flow tester CFT-50 manufactured by Shimadzu Corporation
The temperature was measured at 280 ° C. using 0 C. [Specific volume under initial load, specific volume under heavy load] Measured by the method described above. [Operability] The number of times of yarn breakage during yarn production was evaluated as follows in terms of the number of times per spindle per day. Less than 3 times: ○, 3 to 6 times: △, more than 6 times: × [Evaluation of antibacterial activity (Unified test method)] According to the unified test method of the Textile Sanitary Processing Council (SEK) I went. Specimens dried in a clean bench after sterilization (approx.
0.4 g), the viable cell count was adjusted to 1 ± 0.3 × 10 ⁵ cells /
Inoculate 0.2 ml of the test bacterial suspension prepared so as to uniformly soak the whole specimen, and tighten the sterilized cap. This is cultured at 37 ± 1 ° C. for 18 hours. The number of viable cells after the culture was measured. As a test bacterium, Staphylococcus aureus ATCC 6538P was used, and the bacteriostatic activity value, which is an indicator of antibacterial activity, was calculated by the following method. Bacteriostatic activity value: LogB-LogC However, it is necessary to satisfy the test establishment condition (Log A-Log C)> 1.5. A: Average number of bacteria recovered immediately after inoculation of standard cloth B: Average number of bacteria recovered after 18 hours of cultivation of standard cloth C: Average value of number of bacteria recovered after 18 hours of cultivation of processed cloth Used those specified in the processing effect evaluation test manual for antibacterial and deodorized products.

Examples 1 to 5 and Comparative Examples 1 to 7 A high melt viscosity component having a melt viscosity shown in Table 1 was obtained by using a composite spinning apparatus in which two kinds of polyesters were arranged in a side-by-side type (cross-sectional area ratio: 1: 1). And a low melt viscosity component were spun from a spinneret (number of holes: 413) at a spinning temperature of 280 ° C., a spinning speed of 1000 m / min, and a discharge amount of 915 g / min. The high melt viscosity component and the low melt viscosity component use PET, and the low melt viscosity component contains an antibacterial agent whose main component is silver zirconium phosphate (NOVALON AG-300, manufactured by Toagosei Co., Ltd.) in the fiber. What was added and dispersed so that the amount became the value of Table 1 was used.
Table 1 shows the evaluation of the operability during spinning.

[0025]

[Table 1]

Next, Examples 1 to 5 and Comparative Examples 1, 3, 5,
7 at a temperature of 72 ° C. and a speed of 125 m /
And a stretching ratio of 3.6 times.
Heat treatment was performed at 60 ° C. to develop crimp. Thereafter, the fiber was cut into a fiber length of 51 mm with a cutter to obtain an antibacterial polyester short fiber having a single yarn fineness of 6 denier. The short fibers were carded using a card machine (manufactured by Daiwa Kiko Co., Ltd.) to obtain a card web as a work cloth. Table 2 shows the bulkiness (specific volume under initial load, specific volume under heavy load) of the obtained fiber and evaluation of the antibacterial property of the work cloth.

[0027]

[Table 2]

As is clear from Tables 1 and 2, Example 1
Fibers Nos. 5 to 5 could be manufactured with good spinning operability, the specific volume under initial load and the specific volume under heavy load were within the scope of the present invention, and both bulkiness and antibacterial properties were excellent. On the other hand, in Comparative Example 1, the melt viscosity of the low melt viscosity component was high, and the ratio of the melt viscosity of the high melt viscosity component and the low melt viscosity component [ηmelt (A)
/ Ηmelt (B)] was too small, resulting in less spiral crimp, a fiber having a small specific volume under heavy load, and poor bulkiness. In Comparative Example 2, the melt viscosity of the low melt viscosity component was low, and the ratio of the melt viscosity of the high melt viscosity component to the low melt viscosity component [ηmelt (A) / ηmelt (B)]
Was too large, so that kneeling occurred during spinning and spinning was not possible. In Comparative Examples 3, 4, and 7, since the melt viscosity of the high melt viscosity component was low, in Comparative Examples 4 and 7, yarn breakage occurred during spinning, and the fibers obtained in Comparative Examples 3 and 7 were formed by spiral crimping. The expression was low and the bulkiness was poor. In Comparative Example 5, since the content of the antibacterial agent of the low melt viscosity component was too small, the obtained fiber was poor in antibacterial properties. In Comparative Example 6, since the content of the antibacterial agent of the low melt viscosity component was too large, thread breakage due to filter clogging occurred during spinning.

[0029]

The antibacterial bulky polyester of the present invention can be obtained with good spinning operability, has good antibacterial properties and bulkiness, and can be suitably used in various applications requiring antibacterial properties. It becomes possible.

Claims (2)

[Claims] 1. A polyester fiber in which two types of polyesters having different melt viscosities are arranged in a side-by-side type, wherein the melt viscosities of the two polyesters satisfy the following formula, and only the low melt viscosity polyester component is an inorganic antibacterial agent. 0.1 to 2.0% by weight of the fiber weight, the specific volume at the initial load of the fiber is 100 cm ³ / g or more, and the specific volume at the heavy load is 2
An antibacterial bulky polyester fiber having a weight of 0 to 40 cm ³ / g. 2.4 ≦ ηmelt (A) / ηmelt (B) ≦ 6.0 (1) 1600 ≦ ηmelt (A) (2) where ηmelt (A) is the melt viscosity of the high melt viscosity component.
(poise) ηmelt (B): melt viscosity of low melt viscosity component (poise) 2. The antibacterial bulk according to claim 1, wherein the main component of the inorganic antibacterial agent is at least one selected from the group consisting of silver zirconium phosphate, calcium silver phosphate, silver zeolite, zinc oxide and titanium oxide. Polyester fiber.