KR20220037489A - Infrared absorbing fibers, knitted fabrics, or non-woven fabrics - Google Patents

Abstract

An infrared absorbing fiber, knitted fabric, or nonwoven fabric comprising an infrared absorbing pigment, wherein L ^* in the CIE1976 color space is 30 or more, and an infrared absorbing fiber, knitted fabric, or nonwoven fabric, and an infrared absorbing fiber, knitted fabric, or nonwoven fabric An infrared absorbing fiber, knitted fabric, or nonwoven fabric having a color difference ΔE of 10 or less in the CIE1976 color space when no infrared absorbing pigment is included.

Description

Infrared absorbing fibers, knitted fabrics, or non-woven fabrics

The present invention relates to infrared absorbing fibers, knitted fabrics, or nonwovens.

Textile products having a property of absorbing light and generating heat are known. For example, since infrared absorbing pigments such as carbon black have a property of absorbing infrared rays and generating heat, they are kneaded or applied to fibers to obtain exothermic fibers.

However, fibers containing carbon black as the infrared absorptive pigment have a problem in that the color tone becomes extremely dark due to the black color of the carbon black, and thus a light color design cannot be applied.

In this regard, in Patent Document 1, as an infrared absorptive pigment, it is a fiber containing composite tungsten oxide fine particles represented by Cs _0.33 WO ₃ , and the content of the fine particles is 0.001 to 80% by weight based on the solid content of the fiber. Fibers are described.

The complex tungsten oxide has a brighter color tone compared to the black of carbon black. For this reason, the textile product containing composite tungsten oxide has the advantage of having a large degree of freedom in a design surface compared with the textile product containing carbon black.

Japanese Laid-Open Patent Publication No. 2006-132042

Composite tungsten oxide, for example, Cs _0.33 WO ₃ (hereinafter referred to as CsWO) exhibits a light blue-green color visible under visible light, and when applied to textile products with a light color tone, the color tone of the resulting textile product may change .

In general, in heat-resistant clothing that is pyrogenic, it is not necessary to configure all of the clothing with pyrogenic textile products, and in clothing, pyrogenous textile products are used only in the portion where heat contributes to cold protection, and other parts are usually It is made up of fiber products. At this time, when used with CsWO-containing textile products as exothermic textile products, a difference in color tone may occur between a portion containing CsWO and a portion not containing CsWO, resulting in a design problem. This tendency is remarkable when the color tone of the target garment is especially bright.

Further, according to Patent Document 1, the CsWO content in the infrared absorbing fiber is 0.001 to 80% by weight relative to the solid content of the fiber, and an excessively wide range is proposed, and when the heat resistance when used as a cold protection garment is insufficient , and excessive cases.

The present invention has been made in view of the above circumstances. Accordingly, an object of the present invention is a fiber, knitted fabric, or nonwoven fabric containing an infrared absorbing pigment and having a property of absorbing infrared light and generating heat, and when applied to clothing such as cold weather clothing, it can provide desirable designability. , to provide a fiber, a knitted fabric, or a nonwoven fabric.

This invention which solves the said subject is as follows.

<Aspect 1> An infrared absorbing fiber, a knitted fabric, or a nonwoven fabric comprising an infrared absorbing pigment, comprising:

L ^* in the CIE1976 color space is 30 or more, and

The color difference ΔE in the CIE1976 color space when the infrared absorbing fiber, knitted fabric, or nonwoven fabric and the infrared absorbing fiber, knitted fabric, or nonwoven fabric does not contain the infrared absorbing pigment is 10 or less

Infrared absorbing fibers, knitted fabrics, or non-woven fabrics.

<Aspect 2> The infrared absorbing fiber, knitted fabric, or nonwoven fabric according to aspect 1, wherein the L ^* in the CIE1976 color space is greater than 90 and satisfying at least one of the following (i) to (iv):

(i) a ^* in the CIE1976 color space is -10 or less;

(ii) a ^* in the CIE1976 color space is 10 or more;

(iii) b ^* in the CIE1976 color space is -10 or less, and

(iv) b ^* in the CIE1976 color space is 10 or more.

<Aspect 3> The infrared-absorbing fiber, knitted fabric, or nonwoven fabric according to aspect 1, wherein the L ^* in the CIE1976 color space is 90 or less.

<<Aspect 4>> The content of the infrared absorptive pigment according to any one of aspects 1 to 3,

With respect to the infrared absorptive fiber, based on the total mass of the infrared absorptive fiber, 0.01 mass% or more and 0.50 mass% or less,

For the infrared absorptive knitted fabric or nonwoven fabric, per area of the infrared absorptive knitted fabric or nonwoven fabric, 0.05 g/m ² or more and 0.50 g/m ² or less

Infrared absorbing fibers, knitted fabrics, or non-woven fabrics.

<Aspect 5> The said infrared ray absorptive pigment according to any one of aspects 1 to 4,

General formula M _x W _y O _z (1)

{In formula (1), M is H, He, alkali metal elements, alkaline earth metal elements, rare earth elements, Mg, Zr, Cr, Mn, Fe, Ru, Co, Rh, Ir, Ni, Pd, Pt, Cu, Ag, Au, Zn, Cd, Al, Ga, In, Tl, Si, Ge, Sn, Pb, Sb, B, F, P, S, Se, Br, Te, Ti, Nb, V, Mo, Ta, Re, Be, Hf, Os, Bi, and at least one element selected from the group consisting of I, W is tungsten, O is oxygen, x, y, and z are each positive numbers, 0 < x /y≤1, and 2.2≤z/y≤3.0}

A composite tungsten oxide represented by, and

General formula W _y O _z (2)

{in formula (2), W is tungsten, O is oxygen, y and z are each positive numbers, and 2.45≤z/y≤2.999}

Tungsten oxide having a Magnelli phase represented by

Infrared absorbing fiber, knitted fabric, or nonwoven fabric comprising at least one selected from the group consisting of.

<<Aspect 6>> The infrared ray absorptive fiber in any one of aspects 1-5.

<Aspect 7> An infrared absorbing knitted fabric or nonwoven fabric comprising the infrared absorbing fiber according to the sixth aspect.

<Aspect 8> It consists of the infrared ray absorbing fiber as described in aspect 6, and the fiber which does not contain an infrared ray absorbing pigment,

The fiber that does not include the infrared absorbing pigment has a configuration in which the infrared absorbing pigment is excluded from the infrared absorbing fiber

Infrared absorbing knitted or non-woven fabric.

<Aspect 9> The infrared-absorbing knitted fabric or nonwoven fabric according to any one of aspects 1 to 5.

<Aspect 10> The infrared absorbing knitted fabric or nonwoven fabric according to aspect 9, which is composed of infrared absorbing fibers containing an infrared absorbing pigment.

<Aspect 11> The aspect 9, which is composed of an infrared absorbing fiber containing an infrared absorbing pigment and a fiber not containing an infrared absorbing pigment,

The fiber that does not include the infrared absorbing pigment has a configuration in which the infrared absorbing pigment is excluded from the infrared absorbing fiber

Infrared absorbing knitted or non-woven fabric.

<Aspect 12> The infrared absorptive clothing comprised from the infrared absorptive knitted fabric or nonwoven fabric in any one of aspects 7-11.

<Aspect 13> Consists of the infrared absorbing knitted fabric or nonwoven fabric according to any one of Embodiments 7 to 11, and a knitted fabric or nonwoven fabric not containing an infrared absorbing pigment,

The knitted fabric or nonwoven fabric not containing the infrared absorbing pigment has a configuration in which the infrared absorbing pigment is excluded from the infrared absorbing knitted fabric or nonwoven fabric

Infrared absorbent clothing.

According to the present invention, a fiber, knitted fabric, or nonwoven fabric containing an infrared absorbing pigment and having a property of absorbing infrared light and generating heat, which can provide desirable designability when applied to clothing such as cold weather clothing, A knitted or nonwoven fabric is provided.

Infrared absorbing fiber, knitted fabric, or nonwoven fabric of the present invention

An infrared absorbing fiber, knitted fabric, or nonwoven fabric comprising an infrared absorbing pigment, comprising:

L ^* in the CIE1976 color space is 30 or more, and

The color difference ΔE in the CIE1976 color space when the infrared absorbing fiber, knitted fabric, or nonwoven fabric and the infrared absorbing fiber, knitted fabric or nonwoven fabric do not contain the infrared absorbing pigment is 10 or less.

The infrared absorbing fiber, knitted fabric, or nonwoven fabric of the present invention further comprises:

Infrared absorbing fibers, knitted fabrics, or nonwoven fabrics may be used in which L ^* in the CIE1976 color space is greater than 90 and satisfies at least one of the following (i) to (iv):

(i) a ^* in the CIE1976 color space is -10 or less;

(ii) a ^* in the CIE1976 color space is 10 or more;

(iii) b ^* in the CIE1976 color space is -10 or less, and

(iv) b ^* in the CIE1976 color space is 10 or more.

The infrared absorbing fiber, knitted fabric, or nonwoven fabric of the present invention is or

L ^* in the CIE1976 color space is 90 or less

Infrared absorbing fibers, knitted fabrics, or nonwoven fabrics may be used.

As used herein, the term "knitted fabric" is a concept including both a fabric (fabric fabric) and a knitted fabric (knitted fabric). "Non-woven fabric" means a sheet-like article in which fibers are entangled, and is a concept that does not include woven fabrics and knitted fabrics. Hereinafter, fibers, knitted fabrics, and nonwoven fabrics are collectively referred to as "textile products".

In this specification, L ^* in the CIE1976 color space of an infrared ray absorptive fiber product may call "L ^* requirement" a thing of 30 or more further, and an infrared ray absorptive fiber product and the infrared ray absorptive fiber product are said infrared rays A color difference ΔE of 10 or less in the CIE1976 color space when no water absorbing pigment is included is sometimes referred to as a “ΔE requirement”.

In addition, the color difference ΔE is a color in the CIE1976 color space of the infrared absorbing textile product (L ^* , a ^* , b ^* ), and the infrared absorbing textile product is in the CIE1976 color space when the infrared absorbing textile product does not contain an infrared absorbing pigment. It is a value represented by the following formula when the color in this is (L ₀ ^* , a ₀ ^* , b ₀ ^* ).

ΔE={(L ^* -L ₀ ^* ) ² +(a ^* -a ₀ ^* ) ² +(b ^* -b ₀ ^* ) ² } ^1/2

The present inventors in order to solve the problem of the present invention,

The color tone of the textile product when it does not contain an infrared absorbing pigment,

The amount of the infrared absorptive pigment contained in the infrared absorptive fiber product;

a change in the color tone of the textile product when a predetermined amount of the infrared absorbing pigment is included;

Exothermicity of textile products when a certain amount of infrared absorbing pigment is included

relationship was reviewed in detail.

As a result, it was found that:

(1) In textile products of dark tones, the change in the color tone of textile products when not including and including infrared absorbing pigments is so small that it does not become a problem from the beginning;

(2) Among textile products of light color tone, especially in bright colors, it is easier to visually discern the change in color tone due to the inclusion of infrared absorbing pigments in textile products with low saturation than textile products with vivid colors with high saturation. , and

(3) By including an infrared-absorbing pigment in a range where a light-colored textile product is difficult to discern a change in color tone, it exhibits comfortable exothermicity as cold-weather clothing.

The present invention has been made based on the above findings.

In the infrared absorptive textile product of the present invention, when L ^* in the CIE1976 color space is 30 or more, by including a significant amount of the infrared absorptive pigment, a change in color tone may become a problem, The color is bright. Accordingly, dark tone textile products having an L ^* of less than 30, in which the change in color tone is difficult to discern even if they contain a significant amount of the infrared absorbing pigment, is excluded from the scope of the present invention.

In the infrared absorbing textile product of the present invention, the color difference ΔE in the CIE1976 color space with and without the infrared absorbing pigment is 10 or less, the range in which the textile product is difficult to discern a change in color tone. indicates that it contains infrared absorbing pigments. While being able to have a comfortable exothermic property as cold protection clothing, the textile product which satisfy|fills this requirement can make small the difference of the color tone with the part which does not contain an infrared-absorbing pigment, and thereby can exhibit desirable designability.

When the brightness of the color tone of the infrared absorptive textile product of this invention is especially large, it becomes easy to identify the change of the color tone of a textile product visually by including an infrared absorptive pigment. In view of this, when the brightness of the color tone of the textile product is particularly large, it is advantageous from the viewpoint of making it difficult to visually identify the change in color tone that the color tone is large. Therefore, when the brightness of the infrared absorptive textile product of the present invention is particularly large, for example, when L ^* in the CIE1976 color space is greater than 90, the following requirements (i) to (iv):

(i) a ^* in the CIE1976 color space is -10 or less;

(ii) a ^* in the CIE1976 color space is 10 or more;

(iii) b ^* in the CIE1976 color space is -10 or less, and

(iv) b ^* in the CIE1976 color space is 10 or more

It is preferable to satisfy at least one of

On the other hand, when the brightness of the infrared absorptive textile product of the present invention is not particularly large, for example, when L ^* in the CIE1976 color space is 90 or less, the change in color tone due to the inclusion of the infrared absorptive pigment is particularly noticeable with the naked eye. There is no circumstance that it is easy to identify as Therefore, in this case, irrespective of the value of a ^* or b ^* , this invention can be applied preferably.

L ^* , a ^* , and b ^* of textile products in CIE1976 color space can be measured by the method as described in the Example mentioned later.

EMBODIMENT OF THE INVENTION Hereinafter, this invention is demonstrated in detail.

《Infrared absorptive fiber products》

The infrared absorptive fiber product of the present invention is

An infrared absorptive fiber product comprising an infrared absorptive pigment comprising:

L ^* in the CIE1976 color space is 30 or more, and

The color difference (DELTA)E in the CIE1976 color space when an infrared absorptive fiber product and an infrared absorptive fiber product do not contain an infrared absorptive pigment is 10 or less.

The infrared absorptive fiber product of the present invention is

L ^* in CIE1976 color space is more than 90, and the infrared ray absorptive fiber product which satisfy|fills at least 1 of following (i)-(iv) may be sufficient:

(i) a ^* in the CIE1976 color space is -10 or less;

(ii) a ^* in the CIE1976 color space is 10 or more;

(iii) b ^* in the CIE1976 color space is -10 or less, and

(iv) b ^* in the CIE1976 color space is 10 or more.

The infrared absorptive fiber product of the present invention is or

L ^* in the CIE1976 color space is 90 or less

Infrared absorptive fiber products may be sufficient.

The color difference (DELTA)E in the CIE1976 color space when an infrared-absorbing textile product and an infrared-absorbing textile product do not contain the said infrared-absorbing pigment is 10 or less. When ΔE between them is 10 or less, it becomes difficult to visually identify the change in color tone due to the fact that the textile product contains an infrared absorptive pigment. The value of ΔE may be 9 or less, 8 or less, 6 or less, 5 or less, or 4 or less. In addition, the value of ΔE may be 0 or more, more than 0, 0.5 or more, 1 or more, 2 or more, or 3 or more.

In the infrared absorbing textile product, when L ^* in the CIE1976 color space is greater than 90, that is, even when the color tone of the textile product is particularly bright, if at least one of (i) to (iv) is satisfied, the fiber It may make it difficult to visually discern the change of color tone by the product containing an infrared ray absorptive pigment. When L ^* is greater than 90, the color difference ΔE may be 5 or less, 4.5 or less, 4 or less, 3.5 or less, or 3 or less, and 0 or more, more than 0, 0.1 or more, from the viewpoint of making the visual identification of the color tone change more difficult. , 0.2 or more, 0.3 or more, 0.4 or more, or 0.5 or more may be sufficient.

However, when L ^* is more than 90, if it is going to make sure the difficulty of visual identification of a color tone change, content of the infrared ray absorptive pigment in the said textile product may be restrict|limited, and exothermic property may be restrict|limited. From this viewpoint, L ^* in CIE1976 color space of infrared-absorbing textile products may be 90 or less.

This L ^* is appropriately set in the above-mentioned range according to the desired color tone of the textile product, for example, in the case of a textile product having a red color tone, L ^* is 90 or less, 80 or less, 70 or less, 60 or less or 50 or less may be sufficient. In the case of a textile product having a yellowish color tone, L ^* may be 90 or less, 89 or less, 88 or less, 87 or less, or 86 or less. In the case of textile products having a blue color tone, L ^* may be 90 or less, 80 or less, 60 or less, or 40 or less.

Even if L ^* is 90 or less, when the color tone of the textile product is relatively bright, for example, when L ^* is more than 80, in order to ensure the difficulty of visually discerning the color change, the color difference ΔE is 8 or less, 7 or less, It is good also as 6 or less or 5 or less. On the other hand, when L ^* is 80 or less, if the color difference ΔE is 10 or less, visual identification of the color tone change becomes very difficult.

<fiber>

The infrared absorbing fiber product of the present invention comprises a fiber and an infrared absorbing pigment.

The fiber in the infrared-absorbing fiber product of the present invention may be appropriately selected from among, for example, synthetic fibers, semi-synthetic fibers, natural fibers, produced fibers, inorganic fibers, and mixed yarns composed of a plurality of these fibers. Considering the dispersibility of the infrared absorptive pigment, the thermal insulation property of textile products, etc., among these, synthetic fibers are preferable.

Examples of the synthetic fibers in the present invention include polyester fibers, polyolefin fibers, acrylic fibers, polyamide fibers, polyether ester fibers, polyvinyl alcohol fibers, polyvinylidene chloride fibers, Polyvinyl chloride-type fiber etc. are mentioned, You may select and use it suitably from these.

The polyester fiber may be, for example, a fiber such as polyethylene terephthalate (PET), polybutylene terephthalate or polyethylene naphthalate.

The polyolefin-based fiber may be, for example, a fiber such as polyethylene, polypropylene, or polystyrene.

The acrylic fiber may be, for example, a fiber made of polyacrylonitrile, acrylonitrile/vinyl chloride copolymer, or the like.

The polyamide-based fiber may be, for example, a fiber made of nylon, nylon 6, nylon 66, nylon 11, nylon 12, nylon 610, aramid, or the like.

The fiber of the present invention may have a cross section of any shape. For example, a circular shape, a polygonal shape, a flat shape, a hollow shape, a Y shape, a star shape, a core sheath shape, etc. may be sufficient.

The fibers of the present invention may be short fibers or long fibers.

<Infrared absorptive pigment>

The infrared absorptive pigment in the infrared absorptive textile product of the present invention absorbs infrared rays, preferably near infrared rays, has a property of emitting heat, a color tone is bright, and a degree of freedom in the design surface of the infrared absorptive textile product of the present invention It is preferable not to inhibit excessively.

As such an infrared absorptive pigment, for example,

General formula M _x W _y O _z (1)

{In formula (1), M is H, He, alkali metal elements, alkaline earth metal elements, rare earth elements, Mg, Zr, Cr, Mn, Fe, Ru, Co, Rh, Ir, Ni, Pd, Pt, Cu, Ag, Au, Zn, Cd, Al, Ga, In, Tl, Si, Ge, Sn, Pb, Sb, B, F, P, S, Se, Br, Te, Ti, Nb, V, Mo, Ta, Re, Be, Hf, Os, Bi, and at least one element selected from the group consisting of I, W is tungsten, O is oxygen, x, y, and z are each positive numbers, 0 < x /y≤1, and 2.2≤z/y≤3.0}

Composite tungsten oxide represented by

General formula W _y O _z (2)

{in formula (2), W is tungsten, O is oxygen, y and z are each positive numbers, and 2.45≤z/y≤2.999}

Tungsten oxide having a Magnelli phase represented by

etc. are mentioned, You may select and use 1 or more types chosen from these suitably.

Here, the alkali metal element is an element of Group 1 of the periodic table excluding a hydrogen atom. Alkaline earth metal elements are elements of Group 2 of the periodic table excluding Be and Mg. The rare earth elements are Sc, Y, and tanthanoid elements.

The composite tungsten oxide represented by the general formula (1) contains the element M. For this reason, free electrons are generated, and the absorption band derived from the free electrons is expressed in the near-infrared wavelength region, so it is preferable as a material that absorbs near-infrared rays with a wavelength of around 1,000 nm and generates heat.

When the value of x/y indicating the addition amount of the element M exceeds 0, a sufficient amount of free electrons are generated so that the near-infrared absorption effect can be sufficiently obtained. As the addition amount of the element M increases, the supply amount of free electrons increases and the near-infrared absorption effect also increases, but the value of x/y saturates at about one. A value of x/y of 1 or less is preferable because generation of an impurity phase in the fine particle-containing layer can be avoided. It is preferable that the value of x/y is 0.001 or more, 0.2 or more, or 0.30 or more, and it is preferable that this value is 0.85 or less, 0.5 or less, or 0.35 or less. The value of x/y is ideally 0.33.

In particular, when the element M in the general formula (1) is at least one of Cs, Rb, K, Tl, In, Ba, Li, Ca, Sr, Fe, and Sn, optical properties as a near-infrared absorptive material, and weather resistance It is preferable from a viewpoint of this improvement, and when M is Cs, it is especially preferable.

In the case of Cs _x W _y O _z (0.25≤x/y≤0.35, 2.2≤z/Y≤3.0), the lattice constant is 7.4060 Å or more and 7.4082 Å or less on the a-axis, and 7.6106 Å or more and 7.6149 Å or less on the c-axis. , which is preferable in terms of optical properties and weather resistance in the near-infrared region.

When the composite tungsten oxide represented by the general formula (1) has a hexagonal crystal structure or is composed of a hexagonal crystal structure, the transmission of the infrared absorbing material fine particles in the visible light wavelength region is improved, and the absorption of the near-infrared light wavelength region is reduced It is preferable because it improves. When the cation of element M is added to the voids of the hexagonal crystal, transmission of visible light wavelength region is improved and absorption of near-infrared light wavelength region is improved. Here, in general, when an element M with a large ionic radius is added, a hexagonal crystal is formed. Specifically, when an element having a large ionic radius such as Cs, Rb, K, Tl, In, Ba, Sn, Li, Ca, Sr, or Fe is added, hexagonal crystals are easily formed. However, it is not limited to these elements, Even if it is elements other than these elements, what is necessary is just to exist the addition element M in the hexagonal space|gap formed in WO ₆ unit.

When the composite tungsten oxide having a hexagonal crystal structure has a uniform crystal structure, the addition amount of the additive element M is preferably 0.2 or more and 0.5 or less, more preferably 0.30 or more and 0.35 or less, ideally as a value of x/y. is 0.33. When the value of x/y becomes 0.33, it is considered that the additive element M is disposed in all of the hexagonal voids.

When the complex tungsten oxide represented by General formula (1) is processed with a silane coupling agent, since it is excellent in dispersibility, near-infrared absorptivity, and transparency in a visible light wavelength range, it is preferable.

In the tungsten oxide having a Magnelli phase represented by the general formula (2), the so-called "Magnelli phase" having a composition ratio where the value of z/y satisfies the relationship of 2.45 ≤ z/y ≤ 2.999 is chemically stable and , since the absorption characteristics in the near-infrared wavelength region are also good, it is preferable as a near-infrared absorbing material.

In the general formulas (1) and (2), the value of z/y represents the level of control of the amount of oxygen. Since the composite tungsten oxide represented by the general formula (1) has a z/y value of 2.2 ≤ z/y ≤ 3.0, the same oxygen control mechanism as that of the tungsten oxide represented by the general formula (2) acts in addition to , there is a supply of free electrons by addition of element M even in the case of z/y=3.0. In general formula (1), it is more preferable that the value of z/y satisfy|fills the relationship of 2.45<=z/y<=3.0.

In addition, it is derived from the raw material compound used at the time of manufacture of the composite tungsten oxide in this invention and a tungsten oxide, and a part of oxygen atoms which comprise the said composite tungsten oxide and a tungsten oxide may be substituted with halogen atoms. However, this is not a problem in the practice of the present invention. Then, the case where a part of oxygen atoms are substituted by the halogen atom is also contained in the composite tungsten oxide and tungsten oxide in this invention.

The infrared absorptive pigment in the present invention largely absorbs light in the near-infrared light wavelength region, particularly in the vicinity of 1,000 nm in wavelength, and therefore the transmitted color tone changes from blue to green in many cases. However, since this color development is faint, when the infrared absorptive textile product of this invention containing the said infrared absorptive pigment is applied to clothing items, such as cold protection clothing, it can provide desirable designability.

Content of the infrared absorptive pigment in the infrared absorptive textile of this invention is mentioned later.

<Infrared absorptive fiber>

The infrared absorbing fiber product of the present invention comprises an infrared absorbing fiber.

Therefore, the infrared absorptive fiber of the present invention is

An infrared absorptive fiber comprising an infrared absorptive pigment, comprising:

L ^* in the CIE1976 color space is 30 or more, and

The color difference ΔE in the CIE1976 color space when the infrared absorbing fiber and the infrared absorbing fiber do not contain the infrared absorbing pigment is 10 or less.

In this specification, the color tone of a fiber may be measured in the state which made the said fiber into plain weave or a tricot dough.

The content of the infrared absorptive pigment in the infrared absorptive fiber of the present invention may be 0.01 mass% or more and 0.50 mass% or less on the basis of the total mass of the infrared absorptive fiber.

The content of the infrared absorptive pigment is preferably 0.01 mass% or more, 0.05 mass% or more, 0.10 mass% or more, based on the total mass of the infrared absorptive fiber, while satisfying the prescribed ΔE requirements of the present invention and realizing comfortable exothermicity; Or 0.15 mass % or more may be sufficient, and 0.50 mass % or less, 0.40 mass % or less, 0.30 mass % or less, or 0.20 mass % or less may be sufficient.

<Method for Producing Infrared Absorbent Fiber>

The infrared absorptive fiber of the present invention may be produced by a known appropriate method, or a method with appropriate modifications added thereto by those skilled in the art.

The infrared absorptive fiber of the present invention, for example,

(1) A method of directly blending an infrared-absorbing pigment with a raw material polymer of a synthetic fiber and spinning;

(2) a method of preparing a master batch containing an infrared ray absorbing pigment at a high concentration in a raw material polymer of a synthetic fiber, mixing the master batch with a diluted polymer containing no infrared absorbing pigment and spinning;

(3) a method of mixing and spinning an infrared ray absorbing pigment in a dope solution containing a raw material polymer for synthetic fibers;

(4) A method of attaching an infrared absorptive pigment to at least one of the surface and the inside of the fiber which does not contain an infrared absorptive pigment

It may be manufactured by methods, such as.

The spinning in the above manufacturing methods (1), (2), and (3) may be wet spinning using an appropriate solvent or dry spinning such as melt spinning.

In order to express a desired color tone, the infrared ray absorptive fiber of this invention may contain colorants, such as an appropriate pigment and dye. This coloring agent may be added at any point in the manufacturing process of an infrared ray absorptive fiber.

<Application of Infrared Absorbent Fiber>

The infrared absorptive fiber of the present invention may be used, for example, applied to an infrared absorptive knitted fabric or nonwoven fabric.

This infrared absorbing knitted fabric or nonwoven fabric may be composed of only the infrared absorbing fiber of the present invention, or may be composed of the infrared absorbing fiber of the present invention and other fibers. Here, the other fibers contain an infrared absorbing pigment, but may be a fiber that does not satisfy at least one of the L ^* requirements and ΔE requirements prescribed in the present invention, or may be a fiber that does not contain an infrared absorbing pigment.

However, in order to achieve the gist of the present invention of providing desirable designability when applied to clothing, it is preferable to use, as other fibers, those having a configuration in which the infrared absorptive pigment is removed from the infrared absorptive fiber of the present invention. .

That is, the infrared absorbing knitted fabric or nonwoven fabric constituted by using the infrared absorbing fiber of the present invention is

Consists of only the infrared absorbing fiber of the present invention, or

The infrared absorptive fiber of the present invention and a fiber having a structure in which the infrared absorptive pigment is removed from the infrared absorptive fiber,

it is preferable

The infrared absorptive fiber of the present invention only needs to satisfy both of the L ^* requirements and ΔE requirements prescribed in the present invention, and the infrared absorptive knitted fabric or nonwoven fabric constituted by using the infrared absorptive fiber of the present invention is a knitted fabric or nonwoven fabric as a whole, the present invention Both of the predetermined L ^* requirements and ΔE requirements may be satisfied, or at least one of these requirements may not be satisfied.

The infrared absorptive knitted fabric or nonwoven fabric constituted by using the infrared absorptive fiber of the present invention is, for example,

Fabrics, such as plain weave, hand-made weave, and a twill weave, may be sufficient;

Knitting (knit) such as chain knitting, short knitting, rib knitting, long knitting, long knitting, non-knitting, and tricot may be used;

The nonwoven fabric may be manufactured by an appropriate method such as a dry method, a wet method, a spun bonding method, a melt blow method, a thermal bonding method, a chemical bonding method, a needle punch method, a spun lace method, a stitch bonding method, or a steam jet method.

<Infrared absorbing knitted fabric or non-woven fabric>

The infrared absorbing textile product of the present invention comprises an infrared absorbing knitted fabric or nonwoven fabric. Hereinafter, knitted fabrics and nonwoven fabrics are collectively referred to as "knitted fabrics, etc." in some cases.

Infrared absorbing knitted fabric of the present invention, etc.

As an infrared absorbing knitted fabric containing an infrared absorbing pigment, etc.,

L ^* in the CIE1976 color space is 30 or more, and

The color difference ΔE in the CIE1976 color space when the infrared absorbing knitted fabric or the like and the infrared absorbing knitted fabric or the like does not contain an infrared absorbing pigment is 10 or less.

The content of the infrared absorptive pigment in the infrared absorptive knitted fabric or the like of the present invention may be 0.05 g/m ² or more and 0.50 g/m ² or less per area of the infrared absorptive knitted fabric or the like.

In order to realize comfortable exothermic properties while satisfying the prescribed ΔE requirements of the present invention, the preferable content of the infrared absorbing pigment may differ depending on the color tone of the infrared absorbing knitted fabric or the like. In the case of bright warm color tones, for example, red and yellow color tone knitted fabrics, the L ^* value is relatively large, and the change in color tone due to the inclusion of infrared absorbing pigments in the knitted fabrics, etc. tends to be easily discerned with the naked eye. there is. For this reason, the content of the infrared ray absorptive pigment for satisfying the ?E requirement has a limit on the upper limit. In this case, the content per area of the infrared absorbing pigment is 0.01 g/m ² or more, 0.03 g/m ² or more, 0.05 g/m ² or more, 0.06 g/m ² or more, 0.08 g/m 2 or more, in order to realize comfortable exothermic property. m ² or more, 0.10 g/m ² or more, or 0.12 g/m ² or more, and in order to ensure that the ΔE requirement is met, 0.50 g/m ² or less, 0.40 g/m ² or less, 0.30 g/m ² or less Below, 0.25 g/m2 or less, or 0.20 g/m2 or less may be ^{sufficient .}

When the color tone is particularly bright, for example, when the L ^* value is greater than 80 or greater than 90, the content per area of the infrared absorbing pigment is 0.30 g/m ² or less from the viewpoint of making the visual perception of color change more difficult. , 0.25 g/m ² or less, 0.20 g/m ² or less, 0.15 g/m ² or less, 0.12 g/m ² or less, or 0.10 g/m ² or less.

On the other hand, in the case of a dark cold color tone, for example, a blue color tone knitted fabric, etc., the L ^* value is relatively small, and the color tone change due to the fact that the knitted fabric etc. contains an infrared absorbing pigment tends to be difficult to discern with the naked eye. there is. For this reason, even if it contains comparatively many infrared-absorbing pigments, there exists a tendency for ΔE requirement to be easily satisfied. In this case, in order to realize comfortable exothermicity, 0.05 g/m ² or more, 0.06 g/m ² or more, 0.08 g/m ² or more, 0.10 g/m ² or more, or 0.12 g/m ² or more may be sufficient, and ΔE To ensure that the requirements are met, 0.50 g/m ² or less, 0.48 g/m ² or less, 0.46 g/m ² or less, 0.44 g/m ² or less, 0.42 g/m ² or less, or 0.40 g/m ² or less. It may be as follows.

<Composition of infrared absorbing knitted fabric, etc.>

The infrared absorbing knitted fabric or the like of the present invention may be composed of only infrared absorbing fibers containing an infrared absorbing pigment, or may be composed of an infrared absorbing fiber containing an infrared absorbing pigment and fibers not containing an infrared absorbing pigment. Here, the fiber which does not contain an infrared absorptive pigment may have the structure which removed the infrared absorptive pigment from the infrared absorptive fiber, and may consist of a material different from this.

However, in order to achieve the gist of the present invention of providing desirable designability when applied to a medical product, as a fiber not containing an infrared ray absorbing pigment, it is preferable to use a fiber having a structure in which the infrared absorbing pigment is removed from the infrared absorbing fiber. desirable.

That is, the infrared absorbing knitted fabric of the present invention, etc.

consists only of infrared absorbing fibers comprising an infrared absorbing pigment, or

An infrared absorbing fiber containing an infrared absorbing pigment, and a fiber having a configuration in which the infrared absorbing pigment is removed from the infrared absorbing fiber.

it is preferable

The infrared absorptive knitted fabric or the like of the present invention may satisfy both the L ^* requirements and ΔE requirements of the present invention as a whole for the knitted fabric, etc., and the fibers constituting the infrared absorptive knitted fabric, etc. are the prescribed L ^* requirements and ΔE of the present invention Both of the requirements may be satisfied, and at least one of these may not be satisfied.

The infrared absorptive knitted fabric of the present invention is constituted using the above fibers, for example,

Fabrics, such as plain weave, hand-made weave, and a twill weave, may be sufficient;

Knitting (knit) such as chain knitting, short knitting, rib knitting, long knitting, long knitting, non-knitting, and tricot may be used;

Fleece forming method (eg, dry method, wet method, spun bonding method, melt blow method, etc.), fleece bonding method (eg thermal bonding method, chemical bonding method, needle punch method, span lace method, stitch bonding method, steam The nonwoven fabric manufactured by appropriate means, such as a jet method, etc.) may be sufficient.

<Method for producing infrared absorbing knitted fabric>

The infrared absorptive knitted fabric of the present invention may be produced by a known appropriate method, or a method with appropriate modifications made thereto by those skilled in the art.

The infrared absorbing knitted fabric of the present invention, for example,

(1) a method of obtaining a knitted fabric by knitting infrared absorbing fibers;

(2) a method of obtaining a fabric by weaving infrared absorbing fibers or fibers containing infrared absorbing fibers and infrared absorbing pigments;

(3) a method of obtaining a nonwoven fabric using an infrared absorbing fiber or an infrared absorbing fiber and a fiber not containing an infrared absorbing pigment by appropriate means such as a fleece forming method or a fleece bonding method;

(4) a method of applying a coating solution containing an infrared absorbing pigment to a knitted fabric or the like not containing an infrared absorbing pigment;

It may be manufactured by methods, such as.

The coating solution used in the method of (4) may contain, for example, an infrared absorbing pigment and a suitable solvent, and, if necessary, in order to improve adhesion between the infrared absorbing pigment and the knitted fabric, etc., a binder You may further contain a polymer etc.

The infrared absorptive knitted fabric of the present invention may contain an appropriate colorant such as a pigment or dye in order to express a desired color tone. This colorant may be applied at any point in the manufacturing process of the infrared absorbing knitted fabric or the like. In particular, in the method of (3) using a coating liquid, you may make it contain a coloring agent in a coating liquid.

《Infrared Absorbent Clothing》

The present invention further provides infrared absorbing clothing.

The infrared absorptive garment of the present invention may contain the infrared absorptive knitted fabric and the like constituted of the infrared absorptive fiber of the present invention, and the infrared absorptive knitted fabric of the present invention.

The infrared absorptive garment of the present invention may be composed of only the infrared absorptive knitted fabric or the like as described above, or may be composed of an infrared absorptive knitted fabric or the like, a knitted fabric containing no infrared absorptive pigment or the like.

The knitted fabric or the like that does not contain the infrared absorbing pigment may have a configuration in which the infrared absorbing pigment is removed from the infrared absorbing knitted fabric or the like, or may be made of a material different from this.

However, in order to achieve the gist of the present invention of providing desirable designability, it is preferable to use, as a knitted fabric etc. which do not contain an infrared absorbing pigment, one having a constitution in which an infrared absorbing pigment is removed from an infrared absorbing knitted fabric or the like.

That is, the infrared absorbing clothing of the present invention is

Consists of only infrared absorbing knitted fabrics containing infrared absorbing pigments, or

It is composed of an infrared absorbing knitted fabric containing an infrared absorbing pigment, etc.

it is preferable

The infrared absorptive garment of the present invention may be manufactured by a known method using the above knitted fabrics or the like.

Example

1. Infrared absorbent knitted fabric

In the following examples and comparative examples, the following raw materials were used for sample preparation.

<Infrared absorptive pigment>

(cesium tungsten oxide)

Sumitomo Metals Mining Co., Ltd. product, "YMS-01A-2", Cs _0.33 WO ₃ 25% by weight, and a dispersion containing propylene glycol monomethyl ether acetate as a solvent

Hereinafter, said infrared absorptive pigment _Cs0.33 WO3 is called " _CsWO ", and the dispersion liquid containing the CsWO and a solvent is called "CsWO dispersion liquid."

(antimony dope tin oxide)

Manufactured by Ishihara Industrial Co., Ltd., "ATO", solid content 100% by weight

(carbon black)

CABOT company make, furnace black "R400R", solid content 100% by weight

<Binder Polymer>

Daiichi Seika Kogyo Co., Ltd. urethane resin solution "Resamine ME-44ELPNS", solid content 30% by weight

<color ink>

Red: Seiko Advance Co., Ltd., "MRJ RX02 510 American Red", solid content 37% by weight

Sulfur: manufactured by Seiko Advance Co., Ltd., "MRJ RX02 NC200 Primrose Yellow", solid content 37% by weight

Blue: manufactured by Seiko Advanced Co., Ltd., 「MRJ RX02 440 Blue」, solid content 37% by weight

Bag: manufactured by Seiko Advance Co., Ltd., "MRJ RX02 120 White", solid content 64% by weight

《Comparative example r1》

(1) Preparation of ink

10.0 parts by weight of red ink (equivalent to 3.70 parts by weight of solid content), 54.0 parts by weight of urethane-based resin solution (equivalent to 16.20 parts by weight of solid content), and 36.0 parts by weight of methyl ethyl ketone (MEK) were mixed, and the content of red ink was 10% by weight (wet/wet) ), 100 parts by weight of a red base ink having a solid content of 19.9% by weight was prepared.

(2) potter

Using a Baker applicator, under the conditions of a wet film thickness of 200 μm and a coating speed of 5.2 m/min, the ink obtained above was applied to a white dough (334 μm thick fabric, L ^* 93.6, a ^* 1.9, b) of 100% polyester. ^* -8.7) was applied. Then, by standing still at 100 ° C. for 1 minute to remove the solvent, a standard fabric sample was prepared.

(3) evaluation

(3-1) Evaluation of light exothermicity

Iwasaki Electric Co., Ltd. lighting eye lamp (model name "PRF250", rated voltage 100 V, rated power consumption 250 W, color temperature 3,200 K, diffused light type) was obtained from a fabric sample cut into a 7 cm x 7 cm square. It was installed at a position 30 cm apart and irradiated with light. At this time, the temperature of the back surface of the fabric (temperature of the surface opposite to the surface on the light irradiation side) before light irradiation (after 0 minutes) and 5 minutes after light irradiation is measured, and the light exothermicity of the fabric sample is determined from the difference between the two. calculated.

The value of the light exothermic property of the fabric sample obtained here was used as a reference for calculating the light heat effect of the infrared absorbing pigment in Examples R1 and R2 and Comparative Example r2.

(3-2) Evaluation of color tone

L ^* , a ^* , and b ^* in the CIE1976 color space were measured for the fabric sample obtained above using the spectrophotometer manufactured by X-Rite, model name "Spectro Eye". The measurement was carried out in a state in which three sheets of white paper (L ^* =94.84, a ^* =0.03, b ^* =0.44, thickness 0.24 mm) were overlapped and spread under the fabric sample.

The values of L ^* , a ^* , and b ^* of the fabric sample obtained here were used as a reference for calculating the color difference ΔE in Examples R1 and R2 and Comparative Example r2.

In addition, the fabric sample obtained here was used as a reference|standard for sensory evaluation of the color difference in Examples R1 and R2, and Comparative Example r2.

《Example R1》

(1) Preparation of ink

By adding 0.12 parts by weight of CsWO dispersion (equivalent to 0.030 parts by weight of CsWO) to 100 parts by weight of the red base ink prepared in the same manner as in Comparative Example r1, the red ink content was 10% by weight (wet/wet), and the CsWO content per ink solid content was 0.15 An infrared absorptive red ink of % by weight was prepared.

(2) potter

In the same manner as in Comparative Example r1, except that the infrared absorbing red ink obtained above was used, coating was carried out on 100% polyester white fabric (fabric) to prepare a fabric sample. Here, the dry weight of the coated ink is obtained from the difference in the weight of the fabric sample before coating and the fabric sample after coating, and the infrared absorptive pigment per unit area of the fabric sample is obtained from the amount of the infrared absorptive pigment contained therein, and the area of the coated surface The content of was calculated.

(3) evaluation

(3-1) Evaluation of photothermal effect

Using the fabric sample of Example R1 obtained, it carried out similarly to Comparative Example r1, and evaluated the light exothermic property and color tone. The light exothermic effect of the infrared absorbing pigment in the fabric sample of Example R1 was calculated by subtracting the value of the light exothermic property of the fabric sample of Comparative Example r1 from the value of the light exothermic property of the fabric sample.

(3-2) Evaluation of color difference ΔE

From the values of L ^{* , a * , and b * of the fabric sample and the values of L * , a * , and b * of the fabric} sample of Comparative Example r1, the fabric sample of Example R1 and the standard of Comparative Example r1 The color difference ΔE of was calculated.

(3-3) Sensory evaluation of color difference

On top of three layers of white paper (L ^* =94.84, a ^* =0.03, b ^* =0.44, thickness 0.24 mm), the fabric sample obtained in this example and the standard fabric sample obtained in Comparative Example r1 were It was placed in a row, and it was investigated whether the difference in the color tone of the two samples could be visually discerned under irradiation with a fluorescent lamp of the daylight color. The test was implemented by 6 testers, and the following criteria evaluated it.

A: When there were no testers (0 persons) who could discern the difference in color tone between the two samples (good)

B: When there is one or two testers who can discern the difference in color tone of both samples (possible)

C: When there were three or more testers who could discern the difference in color tone between the two samples (defective)

《Example R2, and Comparative Example r2》

In the same manner as in Example R1, except that the amount of the CsWO dispersion added to 100 parts by weight of the red base ink was as described in Table 1, respectively, an infrared absorbing red ink was prepared, and coating on the dough was used using the same. and evaluation.

《Comparative example r3》

The amount of the urethane-based resin solution, the red ink, and the MEK was the same as in Comparative Example r1, except that the amounts of the urethane-based resin solution, the red ink, and the MEK were respectively as described in Table 1, and the red ink content was 30 wt% (wet/wet), and the solid content was 21.6. A red base ink of weight % was prepared, and coating and evaluation were performed on the dough using this.

The light exothermic properties of the fabric samples obtained here, and the values of L ^* , a ^* , and b ^* were used as criteria for calculating the light heat effect of the infrared absorbing pigments in Examples R3 and R4 and Comparative Example r4, and the color difference ΔE. was used.

In addition, the fabric sample obtained here was used as a reference|standard for sensory evaluation of the color difference in Examples R3 and R4, and Comparative Example r4.

《Example R3》

(1) Preparation of ink

By adding 0.13 parts by weight of CsWO dispersion (equivalent to 0.03 parts by weight of CsWO) to 100 parts by weight of the red base ink prepared in the same manner as in Comparative Example r3, the red ink content was 30% by weight (wet/wet), and the CsWO content per ink solid content was 0.15. A weight % infrared absorbing red ink was prepared, and coating and evaluation were performed on the dough using this.

《Example R4, and Comparative Example r4》

As the red base ink, 100 parts by weight of the red base ink prepared in the same manner as in Comparative Example r3 was used, and the amount of the CsWO dispersion added to 100 parts by weight of the red base ink was as described in Table 1, respectively, except that In the same manner as in Example R3, an infrared absorbing red ink was prepared, and coating and evaluation were performed on the dough using this.

The above results are shown in Table 2.

"Comparative Example y1, Examples Y1 and Y2, Comparative Examples y2 and y3, Examples Y3 and Y4, and Comparative Example y4"

A yellow base ink ( Comparative Examples y1 and y3) and infrared absorbing yellow ink (Examples Y1 to Y4, and Comparative Examples y2 and y4) were prepared, and coating and evaluation were performed on the dough using these.

The light exothermic properties of the fabric samples obtained in Comparative Example y1, and the values of L ^* , a ^* , and b ^* were calculated by the light heat effect of the infrared absorbing pigments in Examples Y1 and Y2 and Comparative Example y2, and the color difference ΔE was used as the standard of In addition, the fabric sample obtained in Comparative Example y1 was used as a reference|standard for sensory evaluation of the color difference in Examples Y1 and Y2, and Comparative Example y2.

The light exothermic properties of the fabric samples obtained in Comparative Example y3, and the values of L ^* , a ^* , and b ^* were calculated by the light heat effect of the infrared absorbing pigments in Examples Y3 and Y4 and Comparative Example y4, and the color difference ΔE was used as the standard of In addition, the fabric sample obtained in Comparative Example y3 was used as a standard for sensory evaluation of the color difference in Examples Y3 and Y4 and Comparative Example y4.

Table 3 shows the formulations of the inks of Examples and Comparative Examples. In addition, Table 4 shows the evaluation results of the photothermal effect, color tones (L ^* , a ^* , and b ^* , and color difference ΔE) with respect to these.

《Comparative Example b1, and Examples B1 to B4》

In the same manner as in Comparative Example r1, Examples R1 and R2, and Comparative Example r2, except that the same amount of blue ink was used instead of the red ink, respectively, a blue base ink (comparative example b1), and an infrared absorbing blue ink (implementation) Examples B1 to B4) were prepared, and coating and evaluation were performed on the dough using them.

The light exothermic properties of the fabric samples obtained in Comparative Example b1, and the values of L ^* , a ^* , and b ^* were used as a reference for calculating the light heat effect and color difference ΔE of the infrared absorbing pigments in Examples B1 to B4. . In addition, the fabric samples obtained in Comparative Example b1 were used as standards for sensory evaluation of color differences in Examples B1 to B4.

Table 5 shows the formulations of the inks of Examples and Comparative Examples. In addition, Table 6 shows the evaluation results of the photothermal effect, color tones (L ^* , a ^* , and b ^* , and color difference ΔE) with respect to these.

《Example R5》

Red ink content by adding 0.24 parts by weight of antimony-doped tin oxide (manufactured by Ishihara Industrial Co., Ltd., "ATO", solid content 100% by weight) to 100 parts by weight of the red base ink prepared in the same manner as in Comparative Example r1, as an infrared absorbing pigment In the same manner as in Example R1 except that an infrared absorbing red ink having an ATO content of 10 wt% (wet/wet) and 1.19 wt% per ink solid content was prepared and used, coating and evaluation of the dough were performed.

《Comparative example r5》

Red ink content by adding 0.03 parts by weight of carbon black (CB) (manufactured by CABOT, furnace black "R400R", solid content 100% by weight) to 100 parts by weight of the red base ink prepared in the same manner as in Comparative Example r1 as an infrared absorbing pigment In the same manner as in Example R1 except that an infrared absorbing red ink having a CB content of 10 wt% (wet/wet) and 0.15 wt% per ink solid content was prepared and used, coating and evaluation of the dough were performed.

In the evaluation of these Examples and Comparative Examples, the fabric sample obtained in Comparative Example r1 was used as a fabric sample serving as a reference for light exothermicity, color difference ΔE, and sensory evaluation.

Table 7 shows the formulations of the inks of Examples and Comparative Examples together with the formulation of Comparative Example r1. In addition, the evaluation results of the photothermal effect and color tones (L ^* , a ^* , and b ^* , and the color difference ΔE) with respect to these are shown in Table 8 together with the evaluation results of Comparative Example r1.

《Comparative Examples p1 to p3 and Examples P1 to P3》

Each color ink, urethane resin solution, MEK, and CsWO dispersion were respectively changed as shown in Table 9. In the same manner as in Comparative Example r1 and Example R1, each color base ink (Comparative Examples p1 to p3) and infrared absorbing inks (Examples P1 to P3) were prepared, and coating and evaluation were performed on the dough using them.

In these evaluations, as a textile sample serving as a criterion for light exothermicity, color difference ΔE, and sensory evaluation, the sample of Comparative Example p1 for the sample of Example P1 and the sample of Comparative Example p2 for the sample of Example P2 For the sample of Example P3, the sample of Comparative Example p3 was used, respectively. The obtained result is shown in Table 10.

2. Infrared absorbent fiber

In the following Examples and Comparative Examples, tests were conducted on tricots or fabrics produced using infrared absorbing fibers containing infrared absorbing pigments. Tungsten cesium oxide CsWO was used as the infrared absorbing pigment, and the content in the fiber was set to 2 levels of 0.11 wt% and 0.52 wt%, and a polyethylene terephthalate (PET) based infrared absorbing fiber was prepared and tested.

In the following examples and comparative examples, the following raw materials were used for sample preparation.

<Infrared absorptive pigment>

(cesium tungsten oxide)

Dispersion powder containing 23 wt% of “YMDS-874”, Cs _0.33 WO ₃ and a dispersant manufactured by Sumitomo Metal Mining Co., Ltd.

Hereinafter, said infrared absorptive pigment _Cs0.33 WO3 is called " _CsWO ", and the dispersion powder containing this CsWO and a dispersing agent is called "CsWO dispersion powder."

<Base resin>

“Bellpet IP121B” manufactured by Bell Polyester Products Co., Ltd., copolymer-type polyethylene terephthalate containing isophthalic acid as a third component, intrinsic viscosity = 0.62

<Preparation of CsWO master batch>

In a twin-screw extruder, 95 parts by weight of the base resin and 5 parts by weight of CsWO dispersed powder (corresponding to 1.15 parts by weight of CsWO) were kneaded to obtain a CsWO master batch containing 1.15% by weight of CsWO.

《Comparative example t1》

(1) Radiation

Using a multifilament melt spinning device, using homo PET as a spinning raw material, spinning for 1 hour under the conditions of a spinning temperature of 290°C, an extrusion amount of 4 kg/h, and a take-up speed of 1,500 m/min, a multifilament of 50 denier 24 filaments Filament fibers were obtained.

(2) Dough production

Using 80% by weight of the multifilament fiber and 20% by weight of the polyurethane fiber, a tricot dough of 32 gauge and an apparent weight of 240 g/m ² was produced by knitting.

(3) evaluation

(3-1) Evaluation of light exothermicity

Iwasaki Electric Co., Ltd. lighting eye lamp (model name "PRF250", rated voltage 100 V, rated power consumption 250 W, color temperature 3,200 K, diffused light type) was cut into a 7 cm x 7 cm square tricot dough. It installed at a position 30 cm away from the sample, and light irradiation was performed. At this time, the surface temperature of Tricot dough before light irradiation (0 minutes after) and 5 minutes after light irradiation was measured, and the light exothermicity of the Tricot material sample was calculated from the difference between them.

The value of the light exothermic property of the Tricot material sample obtained here was used as a reference for calculating the light exothermic effect of the infrared absorbing pigment in Example T1 and Comparative Example t2.

(3-2) Evaluation of color tone

L ^* , a ^* , and b ^* in the CIE1976 color space were measured for the Tricotte dough sample obtained above using the spectrophotometer manufactured by X-Rite, the model name "Spectro Eye". The measurement was carried out in a state in which three sheets of white paper (L ^* =94.84, a ^* =0.03, b ^* =0.44, thickness 0.24 mm) were overlapped and spread under the Tricot dough sample.

The values of L ^* , a ^* , and b ^* of the tricot dough sample obtained here were used as a reference for calculating the color difference ΔE in Example T1 and Comparative Example t2.

《Example T1》

(1) Radiation

In the same manner as in Comparative Example t1, except that 9.57 parts by weight of CsWO masterbatch and 90.43 parts by weight of homo PET were used as spinning raw materials, infrared absorbing multifilament fibers containing 0.11% by weight of CsWO were obtained.

(2) Dough production

In the same manner as in Comparative Example t1, except that 80% by weight of the infrared absorbing multifilament fiber and 20% by weight of the polyurethane fiber were used, an infrared absorbing tricot dough was prepared. The CsWO content of this infrared absorptive tricot dough was 0.19 g/m ² .

(3) evaluation

Using the obtained infrared absorptive tricot dough, it evaluated in the same manner as in Comparative Example t1.

《Comparative example t2》

In the same manner as in Comparative Example t1, except that 45.25 parts by weight of CsWO masterbatch and 54.75 parts by weight of homo PET were used as spinning raw materials, infrared absorbing multifilament fibers containing 0.52% by weight of CsWO were obtained. Using the obtained infrared absorptive multifilament fiber, it carried out similarly to Example T1, and produced and evaluated the infrared absorptive tricot dough.

Table 11 shows the evaluation results of the light heat effect and color tones (L ^* , a ^* , and b ^* , and the color difference ΔE) for the Examples and Comparative Examples.

《Comparative example c1》

(1) Radiation

Using a multifilament melt spinning device, using homo PET as a spinning raw material, spinning for 1 hour at a spinning temperature of 290 ° C, an extrusion amount of 4 kg/h, and a take-up speed of 1,500 m/min, 75 denier 24 filament multi Filament fibers were obtained. By twisting two of these multifilament fibers together, a double yarn equivalent to 150 denier was obtained.

(2) Fabric making

Using the obtained twin yarn as a weft yarn, a polyester/wool blend yarn (250 denier) having a weight ratio of 50: 50 as a warp yarn, a weft yarn: warp usage ratio of 41: 59 by weight ratio, a 3/1 twill weave using a Schonherr type loom By doing so, a fabric having an area weight of 170 g/m ² was obtained.

(3) evaluation

Since the fabric obtained here is a woven fabric made of 3/1 twill, the warp surface on which a large amount of warp polyester/wool blend yarn is exposed and the weft surface on which a lot of weft twin yarns are exposed form the front and back. Therefore, evaluation of the exothermic property of the fabric sample and evaluation of color tone were respectively performed on both the warp and weft surfaces.

(3-1) Evaluation of light exothermic properties

Iwasaki Electric Co., Ltd. lighting eye lamp (model name "PRF250", rated voltage 100 V, rated power consumption 250 W, color temperature 3,200 K, diffused light type) was cut from a fabric sample cut into a 7 cm x 7 cm square. It was installed at a position 30 cm apart, and light irradiation was performed. At this time, the temperature of the fabric back surface before light irradiation (0 minutes after) and 5 minutes after light irradiation was measured, and the light exothermicity of the fabric sample was calculated from the difference between them.

The value of the light exothermic property of the fabric sample obtained here was used as a reference for calculating the light heat effect of the infrared absorbing fabric in Example C1 and Comparative Example c2, respectively, on the warp and weft surfaces.

(3-2) Evaluation of color tone

L ^* , a ^* , and b ^* in the CIE1976 color space were measured for the fabric sample obtained above using the spectrophotometer manufactured by X-Rite, model name "Spectro Eye". The measurement was carried out in a state in which three sheets of white paper (L ^* =94.84, a ^* =0.03, b ^* =0.44, thickness 0.24 mm) were overlapped and spread under the fabric sample.

The values of L ^* , a ^* , and b ^* of the fabric sample obtained here were used as a reference for calculating the color difference ΔE in Example C1 and Comparative Example c2, respectively, for the warp and weft surfaces.

《Example C1》

(1) Radiation

As a spinning raw material, except that 9.57 parts by weight of CsWO masterbatch and 90.43 parts by weight of homo PET were used, in the same manner as in Comparative Example c1, containing 0.11% by weight of CsWO, an infrared absorbing multifilament fiber of 75 denier 24 filaments was obtained. By twisting two of these infrared absorbing multifilament fibers together, an infrared absorbing twin yarn equivalent to 150 denier was obtained.

(2) Fabric making

In the same manner as in Comparative Example c1, except that the infrared absorbing twin yarn obtained above was used as the weft yarn, an infrared absorbing fabric having a weight per unit area of 170 g/m ² was obtained. The CsWO content of this infrared absorbing fabric was 0.08 g/m ² .

(3) evaluation

About the obtained infrared ray absorptive fabric, it carried out similarly to the comparative example c1, and performed evaluation.

《Comparative example c2》

In the same manner as in Comparative Example c1, except that 45.25 parts by weight of CsWO masterbatch and 54.75 parts by weight of homo PET were used as spinning raw materials, infrared absorbing multifilament fibers containing 0.52% by weight of CsWO were obtained. Except for using the obtained infrared absorbing multifilament fiber, an infrared absorbing twin yarn was prepared in the same manner as in Example C1, and using this, an infrared absorbing fabric having an area weight of 170 g/m ² was obtained. The CsWO content of this infrared absorbing fabric was 0.35 g/m ² .

This infrared absorptive fabric was evaluated in the same manner as in Comparative Example c1.

Table 12 shows the evaluation results of the light heat effect, color tones (L ^* , a ^* , and b ^* , and color difference ΔE) for the Examples and Comparative Examples.

Claims (13)

An infrared absorbing fiber, knitted fabric, or nonwoven fabric comprising an infrared absorbing pigment, comprising:
L ^* in the CIE1976 color space is 30 or more, and
The infrared absorbing fiber, knitted fabric, or nonwoven fabric and the infrared absorbing fiber, knitted fabric, or nonwoven fabric having a color difference ΔE in the CIE1976 color space of 10 or less when the infrared absorbing fiber, knitted fabric, or nonwoven fabric does not contain the infrared absorbing pigment, or Non-woven. According to claim 1,
Infrared absorbing fiber, knitted fabric, or nonwoven fabric, wherein said L ^* in CIE1976 color space is greater than 90, and also satisfies at least one of the following (i) to (iv):
(i) a ^* in the CIE1976 color space is -10 or less;
(ii) a ^* in the CIE1976 color space is 10 or more;
(iii) b ^* in the CIE1976 color space is -10 or less, and
(iv) b ^* in the CIE1976 color space is 10 or more. According to claim 1,
Infrared absorbing fiber, knitted fabric, or nonwoven fabric wherein said L ^* in CIE1976 color space is 90 or less. 4. The method according to any one of claims 1 to 3,
The content of the infrared absorptive pigment,
With respect to the infrared absorptive fiber, based on the total mass of the infrared absorptive fiber, 0.01 mass% or more and 0.50 mass% or less,
For the infrared absorbing knitted fabric, per area of the infrared absorbing knitted fabric, 0.05 g/m ² or more and 0.5 g/m ² or less of infrared absorbing fiber, knitted fabric, or nonwoven fabric. 5. The method according to any one of claims 1 to 4,
The infrared absorbing pigment
General formula M _x W _y O _z (1)
{In formula (1), M is H, He, alkali metal elements, alkaline earth metal elements, rare earth elements, Mg, Zr, Cr, Mn, Fe, Ru, Co, Rh, Ir, Ni, Pd, Pt, Cu, Ag, Au, Zn, Cd, Al, Ga, In, Tl, Si, Ge, Sn, Pb, Sb, B, F, P, S, Se, Br, Te, Ti, Nb, V, Mo, Ta, Re, Be, Hf, Os, Bi, and at least one element selected from the group consisting of I, W is tungsten, O is oxygen, x, y, and z are each positive numbers, 0 < x /y≤1, and 2.2≤z/y≤3.0}
A composite tungsten oxide represented by, and
General formula W _y O _z (2)
{in formula (2), W is tungsten, O is oxygen, y and z are each positive numbers, and 2.45≤z/y≤2.999}
Tungsten oxide having a Magnelli phase represented by
Infrared absorbing fiber, knitted fabric, or nonwoven fabric comprising at least one selected from the group consisting of. The infrared absorptive fiber of any one of Claims 1-5. An infrared absorbing knitted fabric or nonwoven fabric composed of the infrared absorbing fiber of claim 6 . It consists of the infrared absorbing fiber of claim 6, and the fiber which does not contain the infrared absorbing pigment,
The infrared absorbing knitted fabric or nonwoven fabric having a configuration in which the fiber not containing the infrared absorbing pigment has a configuration in which the infrared absorbing pigment is excluded from the infrared absorbing fiber. The infrared absorbing knitted fabric or nonwoven fabric of any one of claims 1 to 5. 10. The method of claim 9,
An infrared absorbing knitted fabric or nonwoven fabric composed of infrared absorbing fibers containing an infrared absorbing pigment. 10. The method of claim 9,
Consists of an infrared absorbing fiber containing an infrared absorbing pigment, and a fiber not containing an infrared absorbing pigment,
The infrared absorbing knitted fabric or nonwoven fabric having a configuration in which the fiber not containing the infrared absorbing pigment has a configuration in which the infrared absorbing pigment is excluded from the infrared absorbing fiber. 12. Infrared absorbing clothing comprising the infrared absorbing knitted fabric or nonwoven fabric according to any one of claims 7 to 11. It consists of the infrared absorbing knitted fabric or nonwoven fabric of any one of claims 7 to 11, and a knitted fabric or nonwoven fabric not containing an infrared absorbing pigment,
The knitted fabric or nonwoven fabric not containing the infrared absorbing pigment has a configuration in which the infrared absorbing pigment is excluded from the infrared absorbing knitted fabric or nonwoven fabric.