JP3220374B2 - Cool fiber - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a cool sensation fiber which has a cool sensation and has an action of protecting the skin from ultraviolet rays, and is particularly suitable for use in clothes and interiors.

[0002]

2. Description of the Related Art Recently, there has been a strong demand for a fiber capable of suppressing heat even when worn under direct sunlight and capable of blocking ultraviolet rays which cause harmful effects on the skin. As one method for responding to this, there are disclosed several techniques for imparting a light-shielding / heat-shielding function to fibers by utilizing the reflection and absorption characteristics of sunlight with fine particles.

JP-A-3-213536 discloses a light-shielding body containing a synthetic fiber containing 5-35% by weight of a ceramic having a spectral reflectance of 50% or more for electromagnetic waves in a wavelength range of 0.4 to 2 μm. I have. In the present invention, a synthetic fiber having a light-shielding property is produced by dispersing a ceramic in a spinning solution and spinning.

Japanese Patent Application Laid-Open No. Hei 7-189018 discloses that an antioxidant / ultraviolet absorber / metal oxide fine particles / pigment titanium oxide is used in an amount of 0.005 to 0.8 /
0.1 to 3 / 0.5 to 5 / 0.02 to 2.0% by weight Synthetic polymer that is uniformly contained in a synthetic polymer to absorb ultraviolet light and reflect visible light and near-infrared light. Is disclosed.

Japanese Patent Application Laid-Open No. 5-78976 discloses a fabric in which at least one type of ceramic fine particles of an alkali metal titanate or an alkaline earth metal titanate is fixed to a resin having a film forming ability. 5 air permeability
There is described a fiber fabric having a cool sensation characterized by being at least cc / cm ² / sec.

However, the technologies disclosed in Japanese Patent Application Laid-Open Nos. Hei 3-213536 and Hei 7-189018 each contain inorganic fine particles such as titanium oxide and silicon oxide in synthetic fibers. Are limited to synthetic fibers. Further, the fiber cloth disclosed in Japanese Patent Application Laid-Open No. 5-78976 has a hard feeling when worn because the alkali metal titanate or alkaline earth metal titanate ceramic particles are adhered to the fiber surface. Easy to fall off by physical external force.

[0007]

SUMMARY OF THE INVENTION The present invention absorbs ultraviolet light and reflects visible light and near infrared light to prevent the effect of ultraviolet light on the skin, and has a cooling effect due to a heat shielding effect. The present invention provides a cool sensation fiber that maintains the washing resistance and feeling of the effect of the present invention.

[0008]

SUMMARY OF THE INVENTION The present invention relates to a cool sensation fiber in which organic polymer particles are fixed to the surface of the fiber with a binder. In particular, the average particle diameter of the organic polymer particles is 0.1.
The present invention relates to the above-mentioned cool sensation fiber, which is 5 to 15 μm.

The cool sensible fiber of the present invention has the ability to absorb ultraviolet light and reflect visible light and near infrared light by fixing organic polymer particles to the surface of the fiber with a binder. It is characterized in that it has a cool feeling effect due to the heat shielding effect while preventing the effect on the skin. Conventionally, inorganic fine particles have been used to impart a function of blocking sunlight to fibers. This may be due to the fact that the inorganic fine particles generally have lower transmittance of sunlight and higher reflectivity. The inorganic fine particles can be uniformly mixed with the synthetic polymer during the production of the synthetic fiber and contained in the synthetic fiber,
It is also possible to adhere to the surface of existing fibers, such as natural fibers. However, the former method cannot be applied to fiber products such as existing fibers and fabrics such as natural fibers. Further, when inorganic fine particles are adhered to the fiber surface by the latter method, there is a serious defect that the feeling of the fiber is impaired.

The present inventors provide the fibers with a cool feeling by the latter method which can be applied to existing fibers such as natural fibers and also to textiles such as woven fabrics and knitted fabrics. In both cases, research has been conducted on a cool-sensible fiber which does not impair the original feel of the fiber and whose performance is not easily reduced by washing. As a result, they have discovered that the object can be surprisingly achieved by adhering fine particles made of an organic polymer to the surface of the fiber with a binder. Moreover, surprisingly, it has been found that it is possible to absorb ultraviolet rays having a wavelength of 0.24 to 0.4 μm and reduce the amount of transmitted ultraviolet rays without requiring the addition of an ultraviolet absorber.

That is, by fixing the organic polymer particles to the fiber surface, the following features can be obtained unlike the method of fixing the inorganic particles. 1. No inferior appearance in appearance such as gloss as compared with the original fiber. 2. There is almost no drop in hand. 3. Good washing durability

The effect of the present invention is to absorb near ultraviolet rays (0.29 to 0.4 μm) having a strong biochemical action in sunlight and, at the same time, absorb visible rays (0.4 to 0.4 μm) having large heat energy.
7 μm) and near infrared (0.7-2 μm). In order to efficiently reflect visible and near-infrared light and absorb ultraviolet light, the average particle size of the organic polymer particles needs to be 0.5 to 15 μm, preferably 1 to 10 μm. When the average particle diameter is smaller than 0.5 μm, the effect of reflecting light decreases. If it is larger than 15 μm, the difference in length from the wavelength region to be reflected is increased, and also the uniformity of adhesion to the fiber is reduced, so that the reflection effect is also reduced, and the feeling of the fiber and Washing durability decreases.

The organic polymer particles used in the present invention include one of polystyrenes, polyamides, polyvinyl chloride, polyolefins, polyurethanes, polyesters, polyacrylic acids, polyacrylates, polyacrylonitriles and epoxy resins. Or it is formed from an organic polymer that is a mixture of two or more. Polystyrenes include, for example, polystyrene homopolymers, polybutadiene rubber or impact strength-improved polystyrene blended or grafted with styrene butadiene rubber and polystyrene, and ABS copolymers. Polyamides include, for example, nylon 6, nylon 66 polymers, and polyolefins. For example, low-density polyethylene, high-density polyethylene, linear low-density polyethylene, polypropylene, polyesters such as polyethylene terephthalate, polyacrylic acids polyacrylic acid, polymethacrylic acid and copolymers thereof, furthermore Are copolymers of these with polyacrylic esters, polymethyl methacrylic acid, polyethyl methacrylic acid, etc., for polyacrylic esters, and polyacrylonitrile for polyacrylonitriles. Ronitororu, acrylonitrile and methacrylonitrile, include copolymers of methyl acrylate. A thermosetting resin such as an epoxy resin can also be used. In order to increase the reflectance on the particle surface, it is advantageous that the refractive index of the organic polymer particles is higher. In order to cause reflection inside the particles, it is more preferable that the polymer is a crystalline polymer so that a refractive index interface exists inside the particles even if the refractive index is the same. In fact, among the above-listed polymers and blends thereof, polyurethane, polyacrylate, and polyamide are particularly preferable from the viewpoint of light scattering properties, moldability into fine particles, and low cost.

The shape of the organic polymer particles may be any one of a spherical shape, a disk shape, a shape having a broken surface or a projection, and other irregular shapes. It can be said that a spherical shape is preferable.

Such organic polymer particles can be produced directly by a suspension polymerization method, by a method of precipitating a polymer solution of a suitable concentration with a nonsolvent under suitable conditions, or by spray drying from a solution of a suitable concentration. Can be used. Commercially available polymer particles, for example, Art Pearl G-7P (manufactured by Negami Kogyo Co .; average particle size 7 μm, polymethyl methacrylate particles), Art Pearl C-800
(Manufactured by Negami Industry Co., Ltd .; average particle size 5 μm, polyurethane particles)
Etc. can also be used.

The effect of the organic polymer particles can be best exhibited by attaching 1 to 15% by weight, preferably 2 to 8% by weight based on the weight of the fiber. With less than 1% by weight, the effect of reflecting light is low,
If the content is more than 15% by weight, the light reflection effect is not increased, but the hand of the fiber is rather lowered, which is disadvantageous.

If necessary, an ultraviolet absorber, a coloring agent, an antistatic agent and other additives can be added to the organic polymer particles.

The fibers for fixing the organic polymer particles to improve the cool feeling include natural fibers such as cotton fibers and hemp fibers.
Any of regenerated fibers such as viscose rayon and cuprammonium rayon, semi-synthetic fibers such as acetate, and synthetic fibers such as polyester may be used. In addition, any of a long fiber, a spun yarn, and a blended yarn may be used.

The cool sensible fiber of the present invention includes a fiber in which organic polymer particles are fixed to a fiber in a fabric state to impart the cool sensation. , Knitting or non-woven fabric. Further, the present invention includes a textile product in which organic polymer particles are adhered to finished clothing, interior, etc. as a product form to impart a cool feeling.

The fixing of the organic polymer particles to the fibers can be carried out as follows. The fiber (or cloth, textile product) is immersed in a bath containing a processing solution in which organic polymer particles are dispersed in a solution containing a binder, and excess processing solution is squeezed out, and then heated and dried, and the binder is cured. Then, the organic polymer particles are fixed to the fiber surface. The fixation of the organic polymer to the raw fiber itself was performed by dipping the fiber wound into a cheese, a corn or the like into a processing solution while continuously pulling out the fiber, drying through a drying zone, and fixing and drying the organic polymer particles. This can be done by continuously winding the fiber. In this case, the amount of the organic polymer particles and the binder attached to the fibers can be controlled by selecting the concentration of the organic polymer particles and the binder in the treatment liquid, and the residence time of the fibers in the treatment bath. The amount of the binder attached to the fibers is 1 to 3% by weight, preferably 1.5 to 2.0% by weight, based on the fibers.

It is essential that the binder to be used does not dissolve in water, does not have tackiness, and does not have rigidity which impairs the feeling of fibers, but there is no particular limitation. However, those which are preferably water-soluble before the heat treatment and become water-insoluble by heating are most preferable because water can be used as a treatment liquid medium. In this respect, preferred binders are polyurethane, polyacrylic acid, polyester, polyamide, and polyamino acid urethane copolymer, and particularly preferred binders are polyurethane, polyacrylic acid, and polyamino acid urethane copolymer.

Hereinafter, the present invention will be described with reference to examples. Example 1 An aqueous treatment solution containing the following components was prepared. Treatment liquid component: PMMA particles (trade name “Art Pearl G-7P”, manufactured by Negami Kogyo Co., Ltd .: average particle diameter 7 μm) 10% by weight Binder (polyurethane-based adhesive; trade name “Elastron MF-25”, Daiichi Kogyo Pharmaceutical Co., Ltd.) 8 触媒 Catalyst (trade name “Elastron Catalyst 64”, manufactured by Dai-ichi Kogyo Seiyaku Co., Ltd.) 0.3 に This treatment solution is cotton-broadened at room temperature (yarn thickness: 50th, both vertical and horizontal, woven) Density: 144 vertical, 78 horizontal), immersed, taken out and squeezed at a squeezing rate of 60%.
For 2 minutes and then heat set at 160 ° C. for 2 minutes. As a result, PMMA particles (spheres) of 5.0% by weight with respect to the fiber could be fixed on the surface of the cotton fiber.
There was no change in the texture of the cotton broad before and after the treatment. Fig. 1 shows an electron micrograph showing the state of fixation of the organic polymer particles.
Shown in

Example 2 Instead of PMMA particles, polyurethane particles (trade name "Art Pearl C-800", manufactured by Negami Kogyo Co., Ltd .; average particle size 5 μm)
m, spherical), polyurethane particles were fixed on the surface of the cotton fiber using the same method as in Example 1. The fixed amount of the polyurethane particles was 6.7% by weight based on the fiber. There was no change in the texture of the cotton broad before and after the treatment.

Example 3 Polyurethane particles (manufactured by Negami Kogyo Co., Ltd., trade name "Artpearl U-7020; average particle size: 6.75 g) instead of PMMA particles.
Polyurethane particles were fixed on the surface of the cotton fiber by using the same method as in Example 1 except that 3 μm, spherical shape was used.
The amount of polyurethane particles fixed is 5.0% by weight based on the fiber.
Met. There was no change in the texture of the cotton broad before and after the treatment.

Example 4 The procedure of Example 3 was repeated, except that the concentration of the polyurethane particles was changed to obtain polyurethane particles "Artpearl U-702".
0 "(manufactured by Negami Kogyo Co., Ltd .; particle size: 6.3 μm, sphere) was prepared to vary the amount of fixation from 1.5 to 8.1% by weight.

Example 5 Evaluation of Heat Insulation Effect The heat insulation effect of the organic polymer particle-fixed cotton broad obtained in Examples 1 to 3 was evaluated by the heat insulation measurement method described later. Table 1 shows the temperature rise at the back of the cotton broad 20 minutes after installation under the sunshine as a difference from the temperature rise in the case of untreated cotton broad (the temperature at the back is approximately The temperature became constant in 7 to 9 minutes, and was kept almost constant thereafter.)
The temperature rise at the back side due to sunlight irradiation from the front side,
4.5-5.0 ° C lower than untreated cotton broad,
Excellent heat shielding effect was confirmed. FIG. 2 shows the rising curves of the back surface temperature of the organic polymer particle-fixed cotton broad and the untreated cotton broad obtained in Examples 1 to 3.

[0027]

[Table 1]

Example 6: Evaluation of Light Blocking Effect The relationship between the amount of organic polymer particles fixed and the light blocking effect of cotton broad, which is a cool fiber obtained in Example 4, was measured. The results are shown in Table 2. The transmittance of the light of 400 nm decreased almost with the increase in the amount of fixation in this fixed amount range, and the light blocking effect was clearly confirmed. It was also confirmed that the reflectance of light having the same wavelength increased with an increase in the amount of polyurethane particles fixed.

[0029]

[Table 2]

The transmission and reflection spectra (solid line) of 3.8% by weight cotton broad of "Art Pearl U-7200" are shown in FIGS. 3 and 4 together with untreated cotton broad (dashed line).

[Evaluation Method] Method of Measuring Heat Barrier As shown in FIG. 5, 8 cm long × 8 cm wide, 1 c deep
A heat sensor (3) is installed at the bottom of the groove of the heat insulating material (5) having a groove cut into m, and a black cloth (4) made of cotton is put on the heat sensor (3). Then, a cloth (1) (10 cm × 10 cm) made of the cool-sensible fiber of the present invention is placed on the cloth, and the temperature rise of the heat sensor section is measured under sunlight. Since the temperature rise is evaluated based on the temperature difference with the untreated fabric (2), the grooves are formed side by side on the same heat insulating material, and the temperature rise is measured in the same manner by installing a temperature sensor, a black cloth and the untreated fabric. I do.

Measurement of Light Blocking Effect Using a fabric made of the cool-sensible fiber of the present invention and an untreated fabric (6.0 cm × 6.0 cm), U-manufactured by Hitachi, Ltd. was used.
The transmission and reflection spectra in the range of 0.24 to 2.6 μm are measured with a −400 type recording spectrophotometer.

[Brief description of the drawings]

FIG. 1 is a scanning electron micrograph showing a surface state of a fiber to which organic polymer particles of Example 1 of the present invention are fixed.

FIG. 2 is a back surface temperature rise curve showing the heat shielding effect of Examples 1 to 3.

FIG. 3 is a transmission light spectrum of 3.8% by weight of organic polymer particles deposited on organic polymer particles of Example 4 of the present invention and untreated cotton broad.

FIG. 4 is a reflection spectrum of 3.8% by weight of organic polymer particles deposited on organic polymer particles and untreated cotton broad of Example 4 of the present invention.

FIG. 5 is a schematic diagram of a thermal barrier measuring device.

[Explanation of symbols]

1. 1. Organic polymer particle fixed fiber sample; 2. untreated sample for comparison; Heat sensor, 4. Black cloth; 5. thermal insulation; Sunbeam

────────────────────────────────────────────────── ─── Continuing on the front page (72) Susumu Katsuen 2-4-1, Kutaro-cho, Chuo-ku, Osaka-shi, Osaka Kurashiki Spinning Co., Ltd. Osaka Head Office (72) Inventor Takeshi Nishida Negami-cho, Nomi-gun, Ishikawa -22 Hayashi-cho Negami Industrial Co., Ltd. (72) Inventor Kazunari Mitsunari 4-1-1, Miyahara, Yodogawa-ku, Osaka-shi, Osaka In-house Co., Ltd. (56) References JP-A-5-230701 (JP, A JP-A-5-78979 (JP, A) JP-A-5-9867 (JP, A) JP-A-4-57970 (JP, A) JP-A-3-237165 (JP, A) 180582 (JP, A) JP-A-8-41764 (JP, A) JP-A-9-13274 (JP, A) (58) Fields investigated (Int. Cl. ⁷ , DB name) D06M 15/00-15 / 715 D06M 23/08

Claims (4)

(57) [Claims] 1. One or two of organic polymer particles having an average particle size of 0.5 to 15 μm and formed of an organic polymer selected from the group consisting of polyurethane, polyacrylate, polymethacrylate and polyamide.
Cool sensation fiber in which more than one kind is fixed to the fiber surface with a binder. 2. The cooling sensation fiber according to claim 1, wherein the organic polymer particles are formed of polymethyl methacrylate. 3. The cool sensation fiber according to claim 1, wherein the amount of the organic polymer particles fixed to the fiber is 1 to 15% by weight based on the fiber. 4. The fiber according to claim 1, wherein the fiber is a cellulosic fiber selected from cellulosic natural fibers, regenerated fibers, and semi-synthetic fibers, or a mixture of two or more thereof, or a mixed fiber of the above cellulosic fibers and synthetic fibers. 3. The cool-sensing fiber according to any one of 3.