JPH07189018A - Light-screening synthetic fiber - Google Patents

Abstract

PURPOSE:To obtain a light-screening synthetic fiber capable of preventing dermatopathy due to ultraviolet radiation and properly screening rays of light ranging from visible to near infrared rays, useful for e.g. clothing excellent in resistance to light and washing, containing each specified amount of an antioxidant, ultraviolet absorber, metallic oxide fine particles and titanium dioxide as pigment. CONSTITUTION:This synthetic fiber contains (A) 0.005-0.8 (pref. 0.01-0.5)wt.% of an antioxidant, (B) 0.1-3wt.% of an ultraviolet absorber, (C) 0.5-5 (pref. 1-4)wt.% of metallic oxide fine particles, and (D) 0.02-2.0 (pref. 0.1-2.0)wt.% of titanium dioxide as pigment. This synthetic fiber has such advantages as to absorb and screen ultraviolet radiation and have refreshing cool feeling and consumption durability owing to the screening effect ranging from visible to near infrared rays.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention absorbs and blocks ultraviolet rays (0.29 to 0.4 .mu.m) in sunlight, and at the same time, visible rays (0.4 to 0.7 .mu.m) and near infrared rays. By efficiently reflecting (~ 2 μm), in addition to the effect of preventing skin damage such as sunburn due to ultraviolet rays, it also has a good heat shield effect from visible light rays to near infrared rays, light resistance and washing resistance. The present invention relates to a light-shielding synthetic fiber suitable for excellent clothing, interior and industrial material applications.

[0002]

2. Description of the Related Art Conventionally, various techniques related to sunlight shielding have been proposed. For example, sunscreen stockings in which microcapsules containing an ultraviolet absorber are entirely bonded with a binder (JP-A-3-206102), wavelength 0.4 to 2 μm.
Synthetic fiber light-shielding body containing 5 to 35% by weight of ceramics having a spectral reflectance of 50% or more of the electromagnetic wave of m
213536) High-density / high-density fabric and UV absorption blocking technology by dark color dyeing are known, but at the same time absorbing UV rays in sunlight, it also effectively reflects visible rays and near-infrared rays, Moreover, a light-shielding synthetic fiber having excellent light resistance, heat resistance, dyeing fastness, washing durability, and other consumption durability has not been put into practical use.

[0003]

DISCLOSURE OF THE INVENTION The present invention is directed to ultraviolet rays (medium wavelength ultraviolet rays: UV-B) in sunlight reaching the surface of the earth.
Wave 0.29-0.32 μm, long-wavelength UV: UV-A wave 0.32-0.4 μm) is effectively absorbed and blocked to effectively prevent human skin disorders such as sunburn (erythema) and pigmentation. The synthetic fiber is provided with excellent consumption durability in addition to a refreshing feeling based on an excellent heat shielding effect against visible rays to near infrared rays. That is, the present invention is a drawback of the relatively low molecular weight ultraviolet absorber used in the conventional synthetic fiber manufacturing process or dyeing process, which is scattering during spinning, insufficient light resistance / heat resistance in the product, and deterioration in sublimation fastness. At the same time, in order to efficiently reflect and shield near-infrared rays from visible rays that are the thermal energy of sunlight, the particle diameter of the metal oxide added to the synthetic fiber, which is a drawback of the conventional method, It is intended to solve both the decrease in spinning operability due to the added amount and the thermal energy reflection efficiency.

[0004]

That is, the present invention provides a synthetic fiber that absorbs ultraviolet rays and reflects visible rays and near-infrared rays, and is an antioxidant / ultraviolet absorber / metal oxide fine particles / and pigment. 0.005 to titanium oxide
0.8% by weight / 0.1-3% by weight / 0.5-5% by weight /
The light-shielding synthetic fiber is characterized by containing 0.02 to 2.0% by weight.

The light-shielding synthetic fiber in the present invention means ultraviolet rays (UV-) among the sunlight rays that can reach the surface of the earth.
A, UV-B) is meant to mean a synthetic fiber which has the property of reflecting visible light and near infrared light at the same time. Such a light-shielding property reduces spinning operability, for example,
Prevents the generation of fiber fluff and yarn breakage due to nozzle clogging, dirt on rollers / guides and abrasion damage, as well as economical production, and final products such as clothing products such as blouses, shirts and stockings, curtains, roll screens and blinds. In order to impart excellent consumption durability, such as light resistance / heat resistance, sublimation fastness, etc., to interior products such as It is necessary that the antioxidant / ultraviolet absorber / fine metal oxide particles / and pigment titanium oxide be uniformly contained during fiber production.

The polymer for synthetic fibers used in the present invention is particularly limited as long as it can uniformly dissolve or disperse the above-mentioned antioxidant / ultraviolet absorber / fine metal oxide particles / titanium oxide in the fiber. Instead, various polymers such as polyesters, polyamides, polyacrylics, polyolefins, polyphenylene sulfides, etc. can be used.

The antioxidant added to the above-mentioned polymer is not particularly limited as long as it has an effect of improving light resistance / heat resistance. For example, a hindered phenol antioxidant or a hindered amine antioxidant can be used. In particular, in the present invention, it is preferable to use both the hindered phenol-based antioxidant and the hindered amine-based antioxidant together because excellent light shielding properties and light resistance / heat resistance can be obtained. As the hindered phenol antioxidant, it is particularly preferable to use a nitrogen-containing hindered phenol antioxidant and a phosphorus-containing hindered antioxidant in combination from the viewpoint of light resistance / heat resistance. Further, as the hindered amine antioxidant, a high molecular weight type one having a molecular weight of 1,000 or more is particularly preferable from the viewpoint of the effect of improving light resistance / heat resistance.
The weight mixing ratio of the hindered phenol antioxidant and the hindered amine antioxidant is preferably 3/1 to 1/3, and particularly preferably 2/1 to 1/2. The amount of these antioxidants used depends on the type of applied polymer,
0.005-0.8% by weight, preferably 0.01-0.
Use 5% by weight.

[0008] The ultraviolet absorber is not particularly limited as long as it is a substance that causes little scattering in the fiber production stage and bleed-out from the polymer, and can efficiently absorb and block ultraviolet rays (UV-A, UV-B). However, for example, a benzotriazole-based UV absorber or a benzophenone-based UV absorber can be used. Especially, in the present invention, from the viewpoint of spinning operability and light-shielding durability in products, light resistance / heat resistance and sublimation fastness. A low volatility UV absorber having a melting point of 140 ° C. or higher is preferable. Highly volatile UV absorbers with a melting point of less than 140 ° C provide good exhaustion properties in post-processing methods such as dyeing and bath treatment, but when the product is heated, it easily bleeds out on the fiber surface, so it is durable against light. Not only is it lacking in properties, but it also has the drawback of reducing the sublimation fastness of dyed products. The amount of UV absorber used depends on the type of polymer applied,
Preference is given to using 0.1 to 3% by weight. If the amount used is less than 0.1% by weight, the effect of blocking the absorption of ultraviolet rays is low and it is 3% by weight.
If it exceeds, it becomes easy to bleed out.

The metal oxide fine particles used in the present invention are not particularly limited as long as they can efficiently reflect and shield visible rays and near infrared rays in sunlight, and examples thereof include titanium oxide, zinc oxide, and oxides. At least one metal oxide such as silicon can be used, but it is important that the average particle diameter of the metal oxide fine particles is 0.05 μm or less. Particularly, in the present invention, an ultrafine particle powder of 0.02 μm or less is used. It is preferable to use it because it can obtain extremely excellent spinning operability and light-shielding property. The amount of the metal oxide fine particles used depends on the fiber thickness and the required reflection level of visible light and near infrared light, but is preferably 0.5 to 5% by weight, and particularly 1 to 5% by weight.
4% by weight is preferable for the balance of spinnability / light-shielding property.
If it is 0.5% by weight or less, the desired light-shielding property cannot be obtained, and conversely, if it is 5% by weight or more, spinning operability and post-process passability (spinability,
In addition to the reduction of knitting / weaving guide, roller wear),
There is a drawback that the pastelization of dyed products becomes remarkable.

The metal oxide fine particles of the present invention are generally used as a dulling agent for synthetic fibers and have an average particle size of 0.1 to 0.3.
Since the purpose of use is different from that of the pigment titanium oxide having a thickness of μm, in the case of the present invention, in addition to the functionality of reflecting the heat ray energy in the sunlight, a good fiber whiteness such as a white product or a light-colored product is required. In addition to the metal oxide fine particles of the present invention, the above-mentioned general dulling agent, for example, anatase type titanium oxide is used in an amount of 0.02 to 2.0% by weight, preferably 0.1 to 2.0% by weight. . Further, by adding 2% by weight or more of pigment titanium oxide having an average particle diameter of 0.1 to 0.3 μm, visible light and near infrared light in sunlight can be reflected and shielded, but spinning operability is significantly reduced. Therefore, it lacks practicality.
Even if the metal oxide fine particles of the present invention are evenly dispersed in the fiber, an appropriate light-shielding property can be obtained. However, by using the specific antioxidant and the ultraviolet absorber in combination, the spinning performance and the light-shielding property are extremely excellent. In addition to the effect (UV absorption plus heat shielding effect), light resistance / heat resistance and sublimation fastness can be significantly improved.

The method for adding the antioxidant, the ultraviolet absorber, the metal oxide fine particles and the pigment titanium oxide to the synthetic fiber depends on the kind of the polymer to be applied, but the known polymer polymerization step or spinning step (spinning). Blend) to the stock solution. Polymers containing these antioxidants, ultraviolet absorbers, metal oxide fine particles and pigment titanium oxide are formed into fibers by a known dry or wet spinning method. Although any cross-sectional shape and thickness of the fiber can be applied, a modified cross-section fiber having a larger surface area than the round cross-section is preferable in terms of light-shielding property. In particular, it is desirable that the deformation degree is 2 or more, and more preferably the deformation degree is 3 or more.

In the synthetic fiber of the present invention, in addition to the above additives, colorants, flame retardants, antibacterial agents, deodorants, water repellents, oil repellents, antistatic agents, conductive agents, water absorbing agents, You may use together functional modifiers, such as an aromatic agent and an insect repellent. The light-shielding synthetic fiber thus obtained is used as a short fiber, a long fiber (raw filament) or a processed yarn, either alone or in combination with a natural fiber or another compound fiber, into various yarn forms, and the known method is used. It is used as a sheet-like product such as knitted fabric, woven fabric and non-woven fabric.

[0013]

The present invention will be specifically described below with reference to examples, but the present invention is not limited thereto. In the examples, all% mean% by weight.

The characteristics of the light-shielding synthetic fiber were measured by the following methods.

1. Ultraviolet absorber (UV blocking property) One white sample for measurement is measured with a spectrophotometer at a wavelength of 0.29 μm.
Ultraviolet transmittance in the range of ~ 0.4 μm is measured, and the area difference from the sample without measurement (blank) is calculated to determine the ultraviolet absorption (UV
(Cutting property).

2. Wavelength 0.4 μm with a spectrophotometer for one visible white light sample
The spectral reflectance in the range of up to 0.7 μm was measured, and the area of the obtained reflectance curve was compared with the area of a normal sample to obtain visible light reflectance.

3. Lightfastness Colored samples were subjected to UV fade meter at 83 ℃ x 2
After irradiation for 00 hours, the light resistance was graded 1 to 5 by a JIS-L-0804 discoloration gray scale.

4. Heat resistance The color samples were subjected to dry heat at 120 ° C for 100 hours, and then the heat resistance was graded 1 to 5 according to JIS discoloration gray scale.

5. Washing resistance A white sample was washed 10 times in accordance with JIS-L-0217 method (method 103), and then the ultraviolet absorption and visible light reflectance were measured to evaluate the light-shielding washing resistance.

6. Sublimation fastness Colored samples were tested at 120 ° C according to JIS-L-0854 method.
After the 80-hour test, the dyeing fastness to sublimation during storage was measured.

7. Spinnability In view of spin nozzle back pressure during fiber production, stains attached to guides / rollers, and yarn breakage, good spinnability was rated as ○, and difficult was rated as x.

8. Cool sensation Using a test cloth and a blank cloth of the same standard for comparison, a symmetrical blouse product was created, and the feeling of wearing after a two-hour wearing test under the hot summer conditions was evaluated. The blank fabric was equivalent to or less than the blank fabric was marked with x.

Example 1 Anatase type pigment titanium oxide having an average particle size of 0.2 μm.
5% of polyethylene terephthalate having an intrinsic viscosity [η] of 0.67 obtained by adding the polymer at the time of polymerizing
Hindered phenolic antioxidant (IRGANOX 1098
= Nippon Ciba Geigy Co., Ltd. = Nitrogen-containing hindered phenol system / IRGANOX 168 = Nippon Ciba Geigy Co., Ltd. = Phosphorus-containing hindered system: 1/1 weight ratio) 0.1%, hindered amine antioxidant (CHIMASSORB 944 = Nippon Ciba Geigy Co., Ltd.) 0.2%, low-volatile benzotriazole-based ultraviolet absorber (TINUVINN 234 = Nippon Ciba Geigy Co., Ltd. = melting point 140 ° C) 0.5%, and ultrafine metal oxide (fine titanium oxide powder) 1 with an average particle size of 0.02 µm 1 % Evenly by a master chip blending method and by a known melt spinning method to make long fibers of 75 denier / 36 filaments, a plain weave having a fabric density of 150 yarns / inch and a width of 96 yarns / inch is prepared. Obtained. The obtained plain woven fabric was used for polyester cloth by a known method (white cloth (scouring set cloth)) and colored material (Nippon Kayaku Co., Ltd. disperse dye: Kayaron Polyester Blue E-FBL 0.
Finally, dyeing was carried out in a dyeing solution corresponding to 8% owf at 130 ° C. for 60 minutes, reduction washing was carried out by a conventional method, and then drying, 160 ° C. × 45 seconds finishing set). Table 1 shows the results obtained by measuring and evaluating the various properties of the obtained material.

Example 2 75 denier / 36 obtained under the same conditions as in Example 1 except that the polyethylene terephthalate was changed to nylon 6.
A plain woven fabric of the same standard using long filaments is used for nylon cloth by a known method for white (scouring set cloth) and colored (Sumitomo Chemical Acid Dye Suminol Milling Cyanine 5R
Voile was dyed for 60 minutes in a dyeing solution equivalent to 0.5% owf, washed in a usual manner, and dried to obtain a finish set of 160 ° C. × 45 seconds. Table 1 shows the evaluation results of various performances of the obtained sample.

Comparative Example 1 A long fiber of 75 denier / 36 filament obtained under the same conditions as in Example 1 except that ultrafine metal oxide particles (fine particles of titanium oxide) having an average particle diameter of 0.02 μm were not added. A white and colored fabric was obtained. Table 1 shows the evaluation results of the obtained samples.

Comparative Example 2 Obtained under the same conditions as in Example 1 except that the anatase-type pigment titanium oxide having an average particle diameter of 0.2 μm and the ultrafine metal oxide (titanium oxide fine particles) having an average particle diameter of 0.02 μm were not added. A plain weave white product and a colored product using 75 denier / 36 filament long fibers were obtained. Table 1 shows the evaluation results of the obtained samples.

Comparative Example 3 75 denier / obtained under the same conditions as in Example 1 except that the low volatility benzotriazole type ultraviolet absorber was not added.
A plain weave white product and a colored product using 36 filament long fibers were obtained. Table 1 shows the evaluation results of the obtained samples.

Comparative Example 4 75 denier obtained under the same conditions as in Example 1 except that the low volatile benzotriazole type ultraviolet absorber and the ultrafine metal oxide (titanium oxide fine particles) having an average particle diameter of 0.02 μm were not added. A white and colored product of a plain woven fabric using long fibers of / 36 filament was obtained. Table 1 shows the evaluation results of the obtained samples.

Comparative Example 5 Low Volatility Benzotriazole UV Absorber (TINUVIN
-234) instead of using a volatile benzotriazole-based UV absorber (TINUVIN-326 = Nippon Ciba Geigy), the same conditions as in Example 1 were used to obtain 75 denier / 36 filament long fibers. A white and colored fabric was obtained. Table 1 shows the evaluation results of the obtained samples.

Comparative Example 6 A plain weave white product using long fibers of 75 denier / 36 filament obtained under the same conditions as in Example 1 except that only anatase type pigment titanium oxide having an average particle size of 0.2 μm was added. I got a colored product. Table 1 shows the evaluation results of the obtained samples.

[0031]

[Table 1]

[0032]

According to the present invention, in a synthetic fiber, a specific antioxidant / low-volatile UV absorber / particle diameter of 0.05 μm
By uniformly adding the following metal oxide fine particles and pigment titanium oxide, there is little reduction in spinning operability, light resistance / heat resistance, excellent consumption durability such as sublimation fastness of dyed products, and moreover, in the sunlight It is possible to obtain a synthetic fiber having an extremely excellent light-shielding property, which efficiently absorbs the ultraviolet rays of the above and at the same time reflects the heat energy from the visible rays to the near infrared rays. Various sheet-like materials using the light-shielding synthetic fiber of the present invention, in addition to an extremely excellent sunburn prevention function, can efficiently provide a cooling function by reflecting heat energy of sunlight, thus preventing various obstacles to sunlight. It can be applied to various fields such as clothing, interior, and industrial materials that should be avoided, and the effect is extremely large.

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Claims (1)

[Claims] 1. In a synthetic fiber that absorbs ultraviolet rays and reflects visible rays and near infrared rays, 0.005 to 0 of antioxidant / ultraviolet absorber / metal oxide fine particles / pigment titanium oxide, respectively. .8% by weight / 0.1-3% by weight /
0.5-5 weight% / 0.02-2.0 weight% is contained, The light-shielding synthetic fiber characterized by the above-mentioned.