JPS63105141A - Antistatic polyester fiber cloth - Google Patents

Abstract

(57) [Abstract] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to an antistatic polyester fiber fabric particularly suitable for use in sterile clothing.

(Prior Art) Conductive composite fibers made of a thermoplastic polymer containing conductive fine particles and a fiber-forming thermoplastic polymer are well known.
It is widely used for the purpose of imparting antistatic properties to textile products by mixing a small amount with electrostatically charged fibers.

By the way, sterile clothing worn in the medical and medical-related industry 1 food industry, etc. has antistatic properties, does not attract dust or bacteria, is white or pale in color from a hygienic perspective, and can withstand sterilization treatment. It is necessary.

In recent years, in addition to the conventional gas sterilization method and heat sterilization method, radiation (
T-ray) sterilization method has come to be adopted.

Sterile clothing sterilizes the air every time you clean it.

When employing the radiation sterilization method, a total of several Mrad of T-rays will be irradiated, and the method must be able to accommodate this.

To date, no antistatic fabrics designed to withstand such radiation sterilization have been proposed.

The proprietary electrical fibers that have been widely used in the past use carbon blanks as conductive particles, and efforts have been made to minimize the coloring caused by the carbon blanks (for example, Japanese Patent Laid-Open No. 56 -15415) cannot completely eliminate coloring.

Fabrics using this fiber have a problem in that they have a sushi-like or heathered appearance.

Furthermore, white conductive fibers using white conductive particles are well known, and some of them have been put into practical use.

Conventional fibers use polyolefins, polyamides, polyalkylene oxides, etc. as thermoplastic polymers.8 According to the inventors' studies, these fibers deteriorate significantly when exposed to radiation. It was completely impractical.

(Problems to be Solved by the Invention) The present invention aims to provide an antistatic polyester fiber fabric that is resistant to radiation sterilization and has a good appearance.

(Means for Solving the Problems) In order to achieve the above object, the present inventors have conducted extensive research, and have used white conductive particles and aromatic thermoplastic polymers. It was discovered that this purpose could be achieved by using polyester1.
We have arrived at the present invention.

That is, the present invention provides a white conductive composite fiber made of an aromatic polyester composition containing conductive fine particles and an aromatic polyester with good fiber forming properties, and an antistatic polyester fiber fabric made of the white aromatic polyester fiber. This is a summary.

In the present invention, aromatic polyester means polyester having an aromatic ring in one molecule.

A specific example is polyethylene terephthalate.

Polybutylene terephthalate, poly-1,4-cyclohexylene dimethylene terephthalate, polyethylene-2
, 6-naphthalate, poly-p-ethyleneoxybenzoate, etc., and polyesters based on these, but the most preferred are polyethylene terephthalate, polybutylene terephthalate, and polyesters based on these in terms of versatility and fiber properties. It is.

In the present invention, three types of polyester are used: a polyester for dispersing conductive fine particles, a polyester for forming a composite fiber together with a polyester composition in which conductive fine particles are dispersed, and a polyester for a polyester fiber that forms a fabric together with the composite fiber. Seed polyester is used,
These may be the same or different.

Further, 5 examples of conductive fine particles in the present invention include:

White ones are used, and specific examples include stannic oxide-based fine particles and cupric iodide-based fine particles. What are stannic oxide-based particles and cupric iodide-based particles?In addition to individual particles of stannic oxide and cupric iodide, they also include titanium dioxide, zinc oxide, calcium oxide, magnesium oxide, calcium carbonate, and zinc carbonate. 3 Calcium sulfate, barium sulfate.

It includes particles coated with inorganic fine particles such as alumina and silica. In the case of stannic oxide particles, conductivity can be increased by using an antimony compound as a receptor.

Particularly preferred are titanium dioxide fine particles coated with stannic oxide because of their excellent conductivity and dispersibility in polyester.

These particles preferably have a specific resistance of 10 3 Ω·cm or less, preferably 10 2 Ω·cm or less, and from the viewpoint of operability, a particle size of 2 μ or less, preferably 1 μ or less is suitable.

The conductive fine particles are mixed as uniformly as possible into the aromatic polyester using, for example, a melt blender. The amount to be blended is determined in consideration of the required conductive performance, thread-spinning properties, etc., but the appropriate amount of conductive fine particles is 50 to 80% by weight, preferably 55 to 75% by weight of one composition.

Furthermore, the weight ratio of the conductive polyester composition and polyester in the composite fiber is 5:95 to 30:7.
It is preferable to set it to 0.

The composite form of the composite fiber is not particularly limited, and may include a sheath-core type, a seabird type in which the conductive polyester composition is an island component, a type in which the conductive polyester composition is divided into multiple parts by polyester and exposed on the fiber surface, etc. will be adopted.

In either case, it is desirable that both components be arranged rotationally symmetrically in the fiber cross section.

If the yarn is non-rotationally symmetrical, the yarn surface will curl under the spinneret during melt spinning, resulting in poor spinning properties.

The composite fiber is manufactured by a known method, but a particularly preferred method is to use high molecular weight polyethylene terephthalate having an intrinsic viscosity of 1.0 or more as the polyester to be composited with the conductive polyester composition, and to cool the melt-spun yarn. 1 After solidification, 4000-5500 m without substantially stretching
This is a method of winding at a speed of /min. (When stretching is applied, the conductive chain is destroyed by the stress during stretching, and the 4
Since the electrical performance deteriorates, it is desirable to employ a method that does not require stretching. ) The polyester fiber fabric of the present invention is made of the above composite fibers and ordinary polyester fibers, but it can be made into a fabric made of side fibers by blending, blending, mixing, knitting, interweaving, interweaving, etc. Can be done. Depending on the case, it may be a non-woven fabric made of one type of thermal fiber.

In the present invention, to obtain a fabric with good appearance,
It is desirable to use white conductive composite fibers with an L* value of 60 or more, preferably 65 or more, and white aromatic polyester fibers with an L* value of 80 or more, preferably 85 or more.

The amount of conductive composite fiber in the fabric is 0.1 to 5% by weight.

Preferably, 0.15 to 3% is appropriate.

Note that within the range not significantly impairing the effect of the fabric of the present invention,
Other types of polymers, matting agents, heat resistant agents, light resistant agents.

It is possible to contain additives such as flame retardants, or to use other types of fibers in combination.

The fabric of the present invention is resistant to radiation sterilization and is particularly preferable when radiation sterilization is applied, but it is also sufficiently resistant to chlorine sterilization and steam sterilization, and is suitable for sterilization by such methods. is also useful.

The fabric of the present invention can be used as it is or after being dyed.

(Examples) Hereinafter, the present invention will be explained in more detail with reference to Examples.

The measurement methods are as follows.

(1) Electrical resistance value Measured by applying a DC voltage of IKV to a yarn of length l Q cm.

(2) Antistatic performance of fabric According to the Faraday gauge method of JIS T8118-1983.

Charge density was measured at 20°C in an atmosphere of 40% R1.

(3) T-ray irradiation CO” (550,000 Kyrie) as a radiation source, 0.3 Mr
1 Composite fibers and fabrics were irradiated at an irradiation rate of ad/hr.

(4) L* value of fibers Measured using a Macbeth KC3-18 automatic color meter for knitted fabrics made of tube-knitted tube-knitted fabrics made by splicing five 4-electroconducting fibers together and for taffeta woven without interweaving conductive fibers. .

Examples and Comparative Examples 65 parts by weight of titanium dioxide particles coated with stannic oxide having a particle size of 0.2 μm and a resistivity of 5 Ω and 35 parts by weight of polybutylene terephthalate are uniformly melted to form a conductive material. A sexual composition was obtained.

This conductive composition and polyethylene terephthalate containing 4.0% titanium dioxide pigment and having an intrinsic viscosity of 1.1 were mixed at a weight ratio of 13:87 at 300°C to form a concentric composite fiber with the former serving as the core. After melt spinning and cooling and solidifying,
Winding at a speed of 5,000 m/min, 15 d
A white conductive composite fiber E having an L* value of /2f and 75 was obtained.

Further, a white conductive composite fiber N having an L* value of 75 was obtained in the same manner using nylon 6 instead of polyethylene terephthalate.

The strength and elongation and electrical resistance values of conductive composite fibers E and N are
Table 1 shows the strength retention and electrical resistance values of conductive composite fibers E and N when irradiated with gamma rays.

Table 2 When weaving taffeta using 75 d / 36 f polyethylene terephthalate yarn with an L* value of 93 and a weave density of 110 threads/)' in warp and 100 threads/) in weft, conductive composite fiber E and N were each implanted as part of the weft yarns at a rate of 1 thread for every 51 cm (approximately 0.5% by weight of the fabric) to obtain thermoelectric fabrics F and FEN.

In addition, nylon 6 of 70 d/24 f with L* value of 93
A conductive fabric FNN was obtained in the same manner using the thread and the conductive composite fiber N.

Note that all of these fabrics had an excellent appearance with inconspicuous conductive fibers.

Table 3 shows the tear retention rate and charge density when these fabrics were irradiated with gamma rays.

Table 3 Fabric F. is of the present invention, and fabrics FEW and FNN are of comparative examples.

Reference Example Polybutylene terephthalate containing 30% by weight of conductive carbon blank and polyethylene terephthalate containing 5.0% titanium dioxide pigment in a weight ratio of 10:
A conductive composite fiber of 15d/2f and an L* value of 40 was obtained in the same manner as in the example using the former as the core.

Using this conductive composite fiber, taffeta was woven according to the same specifications as Fabric F.

The obtained fabric had a conspicuous black-gray color made of conductive composite fibers.

(Effects of the Invention) The polyester fiber fabric of the present invention has good antistatic properties, radiation sterilization resistance, and is white. An antistatic polyester fiber fabric useful as an antistatic polyester fiber fabric is provided.

Claims (4)

[Claims] (1) A white conductive composite fiber made of an aromatic polyester composition containing conductive fine particles and an aromatic polyester with good fiber-forming properties, and an antistatic polyester fiber fabric made of a white aromatic polyester fiber. (2) The fabric according to claim 1, wherein the conductive fine particles are titanium dioxide particles coated with stannic oxide. (3) The fabric according to claim 1, wherein the aromatic polyester is polyethylene terephthalate, polybutylene terephthalate, or a polyester mainly composed of these. (4) The fabric according to claim 1, wherein the content of the conductive composite fiber is 0.1 to 5% by weight.