JPH03249214A - White fiber and cloth - Google Patents

Abstract

PURPOSE:To obtain a white fiber resistant to resoiling in washing and having excellent heat-insulation by using a fiber-forming polymer containing white fine particles capable of absorbing energy and emitting far infrared radiation as a core component and a fiber-forming polymer containing a fluorescent brightener as a sheath component. CONSTITUTION:The objective white fiber is produced by the core-sheath conjugation of (A) a core component composed of a fiber-forming polymer (e.g. polyester) compounded with preferably 1-7wt.% of white fine particles capable of absorbing light energy and emitting far infrared radiation (e.g. stannic oxide doped with antimony oxide) and (B) a sheath component composed of a fiber- forming polymer (preferably same as the polymer of the core component) compounded with preferably 0.01-0.3wt.% of a fluorescent brightener (preferably oxazole-type fluorescent brightener). A cloth suitable for sports wear, etc., is produced by using the fiber as at least a part of the cloth.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to white fibers and fabrics that have heat retaining properties and are less likely to be recontaminated by washing.

(Conventional technology) Conventionally, synthetic fibers generally have strong strength.

It has various characteristics such as excellent dimensional stability and good color fastness, but because it is hydrophobic itself, airborne dirt can adhere to it during handling. or stains due to contact during processing or wearing,
It has the disadvantage that recontamination easily occurs during washing.

Among these, measures have been taken to prevent the adhesion of dirt floating in the air, such as interweaving or cross-knitting antistatic threads or conductive threads on fabrics, and using antistatic agents in finishing agents. and is achieving results.

On the other hand, methods for preventing recontamination due to washing include (1) a method in which after pretreatment with an alkali, the epoxy group is treated with a hydrophilic agent having a functional group and an agent having two or more glycidyl groups; (Special Publication No. 50-13880)
(2) A method in which special surfactants, acids, water-soluble salts, etc. are added to an aqueous dispersion of a polyester polyether block copolymer, and the mixture is treated in a treatment liquid at a specific set temperature (Japanese Patent Publication No. 53 -46960), (3) pre-hydrophilic treatment of the fibers so that they can be easily removed even if they get dirty, (4) a method to make it difficult to get dirty by applying a fluorine-based water repellent, and many other methods. have been proposed, but none of them are sufficient. Regarding the former two (1) and (2).

The processing is complicated, and finishing methods are limited by the latter (3) hydrophilic processing method and (4) antifouling processing method using a fluorine-based water repellent.

Each of these had drawbacks, such as the fact that once dirt began to accumulate, it was difficult to remove. In addition, the unique cooling sensation that synthetic fibers have has made it difficult to apply them to applications that require warmth, such as winter clothing (winter sports, etc.).

(Problem to be solved by the invention) Especially sports clothing that requires repeated washing.

The conventional methods described above cannot sufficiently prevent fluorescent whitening products used for car seat covers, sheets, white coats, socks, etc. from being recontaminated by washing.

The industry that handles fluorescent whitening textile products is eagerly awaiting the development of white fabrics that are less likely to be re-contaminated by washing. In the field of winter sports clothing, which is mainly used outdoors, there has been a long-awaited development of a white fabric that also has heat retention properties.

The present invention was carried out in view of the current situation, and an object of the present invention is to obtain white fibers and white fabrics that have recontamination prevention properties and heat retention properties during washing.

(Means for Solving the Problems) The present invention achieves the above-mentioned objects and has a first-order configuration.

In other words, 1 the present invention is ``a fiber-forming polymer containing white fine particles that absorbs light energy and emits far infrared rays as a core component, and a fiber-forming polymer containing a fluorescent whitening agent as a sheath component. "Core-sheath composite white fiber" and "Fiber-forming polymer whose core component is a fiber-forming polymer containing white fine particles that absorb light energy and emit far-infrared rays, and which contains an optical brightener. The gist of the invention is "a white fabric in which part or all of the fabric is made of a core-sheath composite type white fiber having the following as a sheath component."

Hereinafter, one aspect of the present invention will be explained in detail.

The white fiber of the present invention is a composite fiber with a core-sheath type cross section, and the core component is made of a fiber-forming polymer containing white fine particles that absorb light energy and emit far infrared rays. .

The fiber-forming polymer that forms the base of this core component includes polyester, polyamide, and polyacryloni (IJ)
Typical examples include melt-spun polymers such as polyester, but other polymers may be used as long as they have fiber-forming properties.

The white fine particles contained in the above polymer are fine particles that have the ability to absorb light energy and emit far infrared rays. 2 Weight% of tin = 0
．． 5/99.5 to 15.0/85.0) or stannic oxide doped with antimony oxide and other inorganic substances (titanium oxide.

Fine particles coated on zinc oxide, calcium oxide, calcium carbonate, zinc carbonate, calcium sulfate, barium sulfate, alumina, etc. (weight% of antimony oxide/stannic oxide/other inorganic substances = 0.515.0/94°) 5-2.
0/18.0/80.0).

The fine particles used in the present invention are powders with a diameter of 10 μm or less, preferably 1 μm or less.

More preferably, it is a fine powder with a particle size of 0.5 μm or less. If the fine particles are larger than 10 μm, not only will there be a problem with heat retention, but when they are incorporated into the fibers described below, they may clog the filter medium in the spinning process or cause yarn breakage during spinning, resulting in poor spinnability. Problems such as a decrease in fiber properties occur, and even if spinning can be carried out, the problem of yarn breakage occurs in the first drawing step.

The content of white fine particles is 0.1% by weight or more and 20% by weight or less, preferably 0.5% by weight based on the weight of the core component of 1 m fiber.
A suitable range is 1% by weight or more and 10% by weight or less, more preferably 1% by weight or more and 7% by weight or less. If the content is less than 0.1% by weight, the desired heat retention property cannot be obtained, and 20% by weight
Above this, the productivity of the fiber is poor and sufficient strength and elongation cannot be obtained in terms of fiber quality.

Methods for incorporating white fine particles into the core component of fibers include a method in which they are directly mixed with the raw material polymer for the core component and then spun, or a masterbatch containing a high concentration of white fine particles in advance is manufactured using a part of the raw material polymer. There is a method in which this is diluted to a predetermined concentration at the time of spinning and then spun.

The sheath component of the core-sheath type white fiber of the present invention is made of a fiber-forming polymer containing a fluorescent whitening agent.

The fiber-forming polymer that forms the base of this sheath component is:

Any polymer can be used as long as it has fiber-forming properties, but it is preferable to use the same polymer as the one used as the core component above, since this will improve the compatibility between the core and sheath.

The optical brighteners contained in the polymer of the sheath component include pyrene, oxazole, and coumarin.

Thiazole series, imidazole series, imidasilone series.

Examples include pyrazole type, benzidine type, diaminocarbazole type, naphthalic acid type, and diaminostilbendisulfonic acid type. Among these, white skin is the best,
Oxazole optical brighteners having excellent acid resistance can be preferably used.

The amount of optical brightener added to the sheath component is 0.005 to 1.0.
% by weight, preferably from 0.01 to 0.3% by weight, is suitable. If this amount is less than 0.005% by weight, the whitening effect will be insufficient, and if it is more than 1.0% by weight, the fibers will turn yellow, which is undesirable.

To incorporate a fluorescent whitening agent into the fiber sheath component.

A method of directly mixing it with the raw material polymer of the sheath component, a method of manufacturing a masterbatch containing a high concentration using a part of the raw material polymer in advance, and diluting this to a predetermined concentration at the time of spinning, and then spinning it. Adopt.

When producing the white fiber of the present invention, a spinneret for spinning conventional core-sheath type composite fibers is used, and the core contains the above-mentioned white fine particles-containing polymer, and the sheath contains the above-mentioned fluorescent brightener-containing polymer. Spinning while introducing.

In the present invention, the core-sheath composite type white fiber obtained as described above is used for part or all of a fabric such as a woven fabric or a knitted fabric to form a white fabric. As a specific example of using white fibers in a part of a fabric, typical examples include methods of using them as face yarns in double-woven fabrics, double-knitted fabrics, etc.1. It may also be used in a pattern such as a key.

The present invention has one or more configurations.

(Function) Like the white fiber of the present invention, the core of the core-sheath composite fiber contains fine particles that absorb light energy and emit far-infrared rays, and the sheath contains a fluorescent whitening agent. If you leave it on for a day, the fine particles in the core will convert sunlight energy into heat energy.

The temperature rises inside the fibers, exerting active heat retention performance, and during washing, the action of the optical brightener in the sheath (the optical brightener mixed in during fiber manufacturing) reduces the amount of water in the washing liquid. Re-contamination due to dirt can be prevented.

(Example) The present invention will be described in more detail with reference to nine examples below. The performance of the fabric in the example was measured and evaluated by the following method.

(1) A white leather fabric was placed under a D56 standard light source and evaluated by a sensory test in three stages (good, slightly poor, poor).

(2) Re-staining property due to washing 0975g of a synthetic pollution source made by mixing the following oil-based staining agent and dry staining agent in a ratio of 3=1,) IJ polyphosphate soda 5g,
Disperse 5 g of sodium laurylbenzenesulfonate in 11 parts of distilled water.

A recontamination solution was prepared.

[Oil-based staining agent]

Stearic acid 12.5% by weight oleic acid
12.5” hardened oil
12.5 Olive oil 12.5
Cetyl alcohol 8.5 "Solid paraffin 21.5 Cholesterol 5.0 [Drying stain agent] Clay 55.0% by weight Portland cement 17.0" Ferric oxide
0.5〃 T-decane 8.75〃 Carbon black 1.75” Next, JIS-
Using the round-o-meter tester used in the washing fastness test method of L-0844, add 200% of the above recontamination solution to the test bottle.
d and steel ball 1 used in the above washing fastness test method
A test piece of white cloth cut into 5 cm x 5 cm was placed in the test piece, sealed, and treated at 40±2°C for 1 hour. After this, the test cloth was removed and rinsed with running water.

100ml of water at 40℃1. 10 on the round-o-meter
After washing for minutes, the test piece was taken out, rinsed with running water, and washed again with 100 nT1 of water at 25°C for 10 minutes using a Laungremeter.
After washing for a minute and rinsing with running water twice, it was dehydrated and dried in a tumbler.

After drying, the grade was determined using a gray scale for contamination. Judgment is done on a 5-level scale, with grade 5 being good with no re-contamination at all.
Grade 1 indicates that there was significant recontamination (darkening).

(3) Heat retention: In a constant temperature room at 20°C and 60%, using a 100W photographic white light source as the energy source.

The surface temperature of the fabric was measured using Thermopure (infrared sensor, manufactured by JEOL Ltd.).

Example 1 Ordinary polyethylene terephthalate was added as an optical brightener to Eastman Kodak Company's Yeast Bly) OB-1.
The sheath component is a mixture of 0.1% by weight of 0.08 μm stannic oxide fine particles doped with antimony oxide as white fine particles that absorb light energy and emit far infrared rays (antimony oxide/tin oxide 21st = 10%/
9-0%) 20 parts by weight and polyethylene terephthalate 8
A uniformly melted mixture of 0 parts by weight was used as the core component, the core-sheath ratio was 1:2, the discharge rate was adjusted so that the fineness after stretching was 150 denier at a spinning temperature of 285°C, and a spinning speed of 1400 m/2. The undrawn yarn was collected at 10 minutes. Next, it was drawn at a temperature of 90° C. and a magnification of 3.2 times, and heat set at 150° C. to obtain a core-sheath composite type white fiber according to the present invention having a fineness of 150 d/36 f.

Using this white fiber for the warp and weft, we weave a fill fabric with a warp density of 99 threads/inch and a weft density of 80 threads/inch, and after scouring and drying, we use a pin tenter manufactured by Jukin Kogyo ■ at 170°C.
Finish setting was performed for 20 seconds to obtain a white fabric of the present invention.

For comparison with the present invention, a comparative fabric (Comparative Example 1) was obtained in exactly the same manner as in Example 1, except that the white fine particles of the core component in Example 1 were omitted.

In addition, a woven fabric was manufactured by the same method as in Example 1, except that the fluorescent whitening agent in the sheath component and the white fine particles in the core component in Example 1 were omitted. Then, using this fabric, Ubitex EBF (1 dispersion fluorescent dye manufactured by Ciba Geigy) 0.8% o, w, f, acetic acid (concentration 48
%) 0.2ml/j! Dye for 15 minutes at 130°C in a dyeing bath, and then dye at 170°C for 20 minutes using a pin tenter manufactured by Jukin Kogyo Co., Ltd.
Perform finishing set for seconds, and create a post-dyed white fabric for comparison (
Comparative Example 2) was obtained.

The fabrics of the present invention and Comparative Example 1.2 were measured and evaluated for white skin, restaining property, and heat retention, and the results are shown in Table 1.

Chapter 1 Table As is clear from Table 1, the fabric of the present invention is:

Comparative example 1. Compared to the fabric of Comparative Example 2, it has a good white skin, exhibits good heat retention by absorbing the light energy of the light source and increasing the fabric surface temperature, and has very little re-staining property due to washing, making it excellent. It had the effect of preventing recontamination.

(Effects of the Invention) The white fibers and fabrics of the present invention do not require dyeing with a fluorescent white dye, and have the effect of preventing recontamination that tends to occur when washing white fabrics, which inevitably have to be washed many times. It also has active heat-retaining properties that absorb light energy and emit far-infrared rays.

Claims (2)

[Claims] (1) Core-sheath composite in which the core component is a fiber-forming polymer containing white fine particles that absorb light energy and emit far-infrared rays, and the sheath component is a fiber-forming polymer containing an optical brightener. A type of white fiber. (2) Core-sheath composite in which the core component is a fiber-forming polymer containing white fine particles that absorb light energy and emit far-infrared rays, and the sheath component is a fiber-forming polymer containing an optical brightener. A white fabric made of molded white fibers used in part or all of the fabric.