JP5248064B2 - Totally aromatic polyamide fiber fabric - Google Patents

Description

  The present invention is a fabric composed of wholly aromatic polyamide fibers mainly colored by print printing, wherein the print printing is made by using a pigment and an ultraviolet shielding agent in combination, and has high light resistance. The present invention relates to a wholly aromatic polyamide fiber fabric, flame retardant work clothes, and flame retardant protective clothing that are fastness. More specifically, the present invention relates to a wholly aromatic polyamide fiber cloth, a flame retardant work clothes, and a fabric made of wholly aromatic polyamide fibers, which are printed by using a combination of an ultraviolet shielding agent and a pigment, thereby improving light resistance. Or relates to flame retardant protective clothing. More specifically, the present invention relates to a wholly aromatic polyamide fiber fabric that is less deteriorated in light resistance and excellent in breathability and wearing comfort.

  Totally aromatic aramid fibers are mainly divided into two types, para type and meta type. Para-type aramid fiber is a synthetic fiber that has excellent mechanical properties, high strength, high elastic modulus, high heat resistance, and the flexibility and lightness peculiar to organic fibers. Because of these features, it is used as a reinforcing material for tires for automobiles, motorcycles, bicycles, toothed belts for automobiles, conveyors, and the like. It is also used for reinforcing optical cables and ropes. Furthermore, in the clothing field, functional clothing such as bulletproof vests, working gloves that are hard to cut against blades, protective clothing such as work clothing and sports clothing, and fire-resistant clothing that is difficult to burn. Has been applied to various areas. Further, the meta-type aramid fiber has excellent properties such as high heat resistance, flame resistance, chemical resistance, strong radiation resistance, and electrical characteristics. For this reason, it is used for protective work clothes for workers in which noro (molten metal lump) and welding sparks may scatter, or for cloths for protective clothes that require spatter resistance in addition to heat resistance. These para-type aramid fibers, meta-type aramid fiber blended fabrics, and fabrics obtained by blending with other fibers are, for example, work clothes worn at gas stations and work clothes explosion-proof protective clothes at factories and construction sites. Used for etc.

However, particularly in outdoor work, the wholly aromatic aramid fiber fabric has a problem that it cannot have a sufficient light fastness, and a printed matter with stickiness cannot be obtained.
In order to eliminate such drawbacks, various printing methods have been conventionally proposed.
For example, Patent Document 1 (Japanese Patent Application Laid-Open No. 1-139814) discloses color development, heat resistance, shape stability at high temperature, and light resistance by incorporating a heat-resistant pigment into a wholly aromatic polyamide fiber. Although it has been shown to improve, there has been a problem of discoloration under prolonged outdoor exposure.
Patent Document 2 (U.S. Pat. No. 6,451,070) describes a method of printing an aramid fiber fabric using a paste containing a pigment and a binder. This is a method that can be immediately applied to the method that has been applied to other fibers, can obtain a relatively dark and clear pattern, and can also obtain good light fastness in terms of fastness. It can be done. However, there is a problem with light resistance in the light color region.

Furthermore, Patent Document 3 (JP-A-62-268876) describes a method using a solvent such as dimethyl sulfoxide, N, N-dimethylacetamide, N-methyl-2-pyrrolidone. This is because the fiber is swelled by a solvent by printing on a fabric made of aramid fiber with a paste of a dye such as a cationic dye, an anionic dye, a vat dye, a disperse dye and an acrylic polymer, and a printing paste comprising the above solvent. The dye is introduced even inside the fiber. According to this method, a good fixing rate can be obtained except for vat dyes, and a printed fabric having a relatively dark color and a clear and good texture can be obtained.
However, this method not only has an adverse effect on the environment because the printing paste contains a large amount of solvent, but also has a limitation in reaching the inside of the fiber of the dye, so that sufficient light fastness cannot be obtained. There is. In addition, vat dyes have a drawback that fastness is good but sufficient concentration cannot be obtained.
Furthermore, in Patent Document 4 (Japanese Patent Application Laid-Open No. 2007-16346), an aramid fiber cloth is printed with a paste containing one or more dyes and dried, and after laser irradiation, soaping is performed, and the dye is used as a fiber. It is said that a printed matter with high light fastness and high density fixability can be obtained by moving it deep inside, but the light fastness cannot be sufficiently eliminated in dyeing, and the light fastness in the light color gamut is mentioned. There wasn't.

As described above, when printing a fabric composed of wholly aromatic polyamide fibers, the conventional method has obtained a deep and clear color and some improvement in light fastness, but it is sufficient. It was not sufficient to obtain a dyed fabric having a concentration and good light fastness and texture. When printing a fabric made of wholly aromatic polyamide fibers, if a print formulation as shown in Patent Document 2 (US Pat. No. 6,410,070) is used, there is a concern about the decrease in flexibility and breathability of the fabric, Many studies have been made on dyeing fibers and fabrics and kneading into a dope. However, these can be improved by combining the texture and density of the fabric with other fibers. However, there are problems as described above.

Japanese Patent Laid-Open No. 1-139814 US Pat. No. 6,410,070 JP-A-62-268876 JP 2007-16346 A

An object of the present invention is to obtain high light fastness by performing print printing using the light fastness pointed out as a disadvantage of wholly aromatic polyamide fibers in combination with an ultraviolet shielding agent and a pigment. In particular, a wholly aromatic polyamide fiber fabric that has improved light fastness and reduced light resistance deterioration when printed and printed in an area where the lightness L ^{* of} the fabric is 30.0 or more, or a flame-retardant work clothes using the same, It is intended to provide fire protection clothing.

The present invention relates to a cloth comprising a wholly aromatic polyamide fiber colored by printing, wherein the printing is performed using a pigment and an ultraviolet shielding agent in combination. About.
Here, in the wholly aromatic polyamide fiber fabric of the present invention, a portion of the fabric that is printed and printed using a pigment and an ultraviolet shielding agent in combination may be a part of the fabric.
It is preferable that the wholly aromatic polyamide fiber fabric has a lightness L ^* of 30.0 or more and a light fastness when irradiated with light by a fade meter at 63 ° C. for 20 hours is 4 or more.
Furthermore, the adhesion amount of the ultraviolet shielding agent is preferably 1.0 to 30.0% by weight.
Further, the ultraviolet screening agent has titanium oxide, silicon dioxide, zinc oxide, basic zinc carbonate, white lead, basic zinc sulfate, lead sulfate, zinc sulfide having a primary particle size in the range of 0.1 to 3.0 μm. At least one selected from the group consisting of cerium oxide, zirconium oxide, tungsten oxide, tin oxide, antimony oxide, and barium sulfate is preferable.
Furthermore, the fabric used in the present invention is a fabric containing 60.0% by weight or less of other fibers, and has a limiting oxygen index (LOI) defined by the JIS L 1096 E method of 26.0 or more. Preferably there is.
Here, the other fibers are at least one selected from the group consisting of flame retardant rayon, flame retardant processed cotton, flame retardant wool, flame retardant polyester fiber, flame retardant vinylon fiber, flame retardant acrylic fiber, and novolac fiber. Species are mentioned.
The wholly aromatic polyamide fiber fabric of the present invention preferably has a strength retention of 70.0% or more after light irradiation at 63 ° C. for 40 hours with a fade meter.
Further, the wholly aromatic polyamide fiber fabric of the present invention may be used in combination with a phosphorus-based and / or halogen-based flameproofing agent in print printing.
Next, the present invention relates to a flame retardant work clothes using at least a part of the above wholly aromatic polyamide fiber fabric.
Next, the present invention relates to a flame retardant protective clothing using at least a part of the wholly aromatic polyamide fiber fabric.

According to the present invention, when printing a mixed fabric made of wholly aromatic polyamide fiber , a pigment and an ultraviolet shielding agent such as titanium oxide, silicon dioxide, zinc oxide, basic zinc carbonate or white lead, basic zinc sulfate, By using at least one selected from the group consisting of lead sulfate, zinc sulfide, cerium oxide, zirconium oxide, tungsten oxide, tin oxide, antimony oxide, and barium sulfate , a fabric with excellent light fastness can be obtained. it can. In particular, the effect can be obtained when printing the fabric with a lightness L ^* of 30.0 or more. Specifically, the light fastness fastness when irradiated with light at a fade meter of 63 ° C. for 20 hours is 4-5 or higher, and the strength retention after 40 hours of irradiation is 70.0% or higher. An aromatic polyamide fiber fabric and a flame-retardant work clothes or a flame-retardant protective device using the same can be provided.

In the present invention, the cloth made of wholly aromatic polyamide fibers is one kind selected from woven fabrics, knitted fabrics, nonwoven fabrics, meshes, and unidirectionally aligned sheets, which are composed of wholly aromatic polyamide fibers as main components. Or it is a combination of two or more materials. Particularly preferred are woven and knitted fabrics made of wholly aromatic polyamide fibers.
The structure of the fabric is not particularly limited, and a known structure such as a twill weave or satin weave may be used in addition to the plain weave. However, 3/1, 3/2, 2/2 twill, warp double twill, warp triple twill structure, etc. are preferably employed when breathability and flexibility are required depending on the application.
The fiber material constituting the fabric may have any shape such as a short fiber spun yarn, a long fiber yarn, a split yarn, or a tape yarn.

Also, the basis weight of the fabric used in the present invention, 180~350g / m ^2, preferably 200-30Og / m ^2. When the basis weight is less than 180 g / m ² , the heat shielding property against flame and radiant heat is poor, and there is a possibility that the human body may be burned. On the other hand, if it exceeds 350 g / m ² , for example, the weight of the fire protective clothing becomes heavy, and the workability in fire fighting activities is hindered.
Furthermore, the single fiber fineness of the wholly aromatic polyamide fiber constituting the fabric is preferably in the range of 0.1 to 10 dtex.

Here, the wholly aromatic polyamide fiber used in the present invention is an aromatic homopolyamide represented by the following formula (1) in which 80 mol% or more, preferably 90 mol% or more of the repeating units constituting the polyamide is represented: A fiber made of an aromatic copolyamide. Here, Ar ₁ and Ar ₂ represent an aromatic group, and among them, those composed of the same or different aromatic groups selected from the following formula (2) are preferable. However, the hydrogen atom of the aromatic group may be substituted with a halogen atom, a lower alkyl group, a phenyl group, or the like.
—NHAr ₁ —NHCO—Ar ₂ —CO— (1)

  Regarding the production method and fiber characteristics of such a wholly aromatic polyamide fiber, for example, British Patent No. 1501948, US Pat. Nos. 3,733,964, 3,767,756, and 3,869,429, JP, JP, Those described in JP-A-49-10032, JP-A-47-10863, JP-A-58-144152, JP-A-4-65513 and the like can be used.

Moreover, para-type wholly aromatic polyamide fibers can be cited as those having excellent heat resistance among the wholly aromatic polyamide fibers, and the chain bond of the aromatic polyamide is coaxial or parallel, and A fiber made of polyamide facing in the opposite direction, for example, a fiber in which 80 mol% or more of Ar ₁ and Ar ₂ is a para-coordinate aromatic group is exemplified.

  Specifically, polyparaphenylene terephthalamide fiber [for example, “Kevlar” manufactured by DuPont Co., Ltd.], copolyparaphenylene 3,4′-oxydiphenylene terephthalamide fiber [for example, manufactured by Teijin Limited, “Technola”] is exemplified.

The meta-type wholly aromatic polyamide fiber is an aromatic polyamide in which 50 mol% or more of the chain bonds are non-coaxial and non-parallel among the wholly aromatic polyamides, for example, dicarboxylic acids such as terephthalic acid and isophthalic acid. Homopolymer using 1 type or 2 types or more such as acid and 1 type or 2 types or more such as metaphenylenediamine, 4,4-diaminophenyl ether, 4,4′-diaminodiphenylmethane, xylylenediamine as diamine A typical example is a fiber made of a copolymerized polymer, and typical examples thereof include polymetaphenylene isophthalamide, polymetaxylene terephthalamide, or isophthalic acid chloride, terephthalic acid chloride, and metaphenylenediamine. There are fibers made of copolymerized polymers.
Specific examples of the meta-type wholly aromatic polyamide fiber include “NOMEX” manufactured by DuPont Co., Ltd. and “CONEX” manufactured by Teijin Limited.

  In addition, when two or more types of aromatic polyamide fibers are used, those that are mixed and used in the form of a spun yarn are preferably exemplified. It is preferable to occupy 5% by weight or more, and the mixing ratio is preferably 50% by weight or less. If the mixing ratio of the para-based polyamide fibers is less than 5% by weight, sufficient strength may not be obtained. On the other hand, if it exceeds 50% by weight, the para-based polyamide fibers tend to cause fibrils, which is not preferable.

  The wholly aromatic polyamide fiber constituting the fabric of the present invention can be blended with other fibers, blended, knitted or knitted to form a fabric. For example, the fiber material mixed with the wholly aromatic polyamide fiber is not particularly limited. However, in order to take advantage of the flame retardancy of the wholly aromatic polyamide fiber, flame retardant rayon, flame retardant processed cotton, flame retardant wool, flame retardant Flame retardant materials such as polyester fiber, flame retardant vinylon fiber, flame retardant acrylic fiber, and novolac fiber are preferred. Among these, as a flame retardant material, a mixture of cellulose such as flame retardant rayon and flame retardant processed cotton, or flame retardant wool is more hygroscopic than a wholly aromatic polyamide fiber alone, and is more preferable in terms of comfort. Moreover, when importance is attached to quick-drying, a flame-retardant vinylon fiber, a flame-retardant acrylic fiber, a flame-retardant polyester fiber, etc. are desirable. The mixing ratio of other fibers is 60% by weight or less, preferably about 30 to 60% by weight in the fabric of the present invention.

  In this case, a fabric made of wholly aromatic polyamide fiber in which the above-mentioned other fiber made of flame retardant fiber is mixed at a ratio of 60% by weight or less has a limiting oxygen index (LOI) defined by the JIS L 1096 E method. Preferably it is 26.0 or more, More preferably, it is 26.0-30.0. If it is less than 26.0, it is difficult to obtain flame-retardant work clothes and protective clothes. In order to make LOI 26.0 or more, the above flame retardant other fibers are used in a mixture of 60% by weight or less, preferably 30 to 50% by weight.

  In the present invention, when a fabric made of wholly aromatic polyamide fibers is printed and printed to obtain the colored fabric, a pigment and an ultraviolet shielding agent are used in combination at the time of printing.

Here, as a pigment used when printing and printing a fabric made of wholly aromatic polyamide fiber, for example, CI Pigment Yellow 93, CI Pigment Brown 23, CI Pigment Red 144, insoluble azo pigments represented by CI Vat Yellow 1 (CI 70600) CI pigments represented by CI pigments such as CI Vat Orange 7 (CI 71105), CI Vat Red 23 (CI 71130), CI Pigment Red 123 (CI 71140), CI Vat Violet 1 (CI 60010), CI Vat Blue 4 (CI 69800) CI 15 Pig (CI 74160), a phthalocyanine pigment typified by Poly-bromo-phthalocyanine, CI Pig ment Red 122, CI Pigment Violet 19 (CI 46500), quinacridone pigments represented by CI Pigment Violet 23, Dioxazine pigments represented by CI Pigment Yellow 110, CI Pigment Orange 42, CI Pigment Iso Red pigments represented by CI Pigment Red 180 In addition, commercially available color pigments such as Dixel series (Dainippon Ink Chemical Co., Ltd.), Imperon series (DyStar Ltd), Ryudai Series (Dainippon Ink Chemical Co., Ltd.) Can be used.
Among these pigments, those that do not discolor with a heat history of 300 ° C. for 15 minutes are particularly preferred, and selenium, phthalocyanine, quinacridone, dioxazine, and isoindolinone pigments are preferably used.
In addition, the adhesion amount of the pigment to the cloth is usually 0.05 to 30.0% by weight, preferably 0.1 to 20.0% by weight.

In print printing, the adhesion amount of the fabric printing paste as solid weight after drying, 7~80g / ^{m 2,} preferably from 10 to 50 g / ^{m 2.}
In the following, the amount of adhesion to the fabric used in this patent is set to% by weight based on the solid content weight of the printing paste adhered per unit area.
Moreover, the ultraviolet shielding agent used together with the pigment in print textile printing can increase the light fastness of the resulting printed textile fabric.
Examples of the ultraviolet shielding agent include titanium oxide, silicon dioxide, zinc oxide, basic zinc carbonate and white lead, basic zinc sulfate, lead sulfate, zinc sulfide, cerium oxide, zirconium oxide, tungsten oxide, tin oxide, antimony oxide, An example is barium sulfate.
The primary particle size of these ultraviolet shielding agents is in the range of 0.1 to 3.0 μm, preferably in the range of 0.2 to 1.0 μm. When the primary particle size is less than 0.1 μm, the surface energy is high, and therefore, aggregation tends to occur. On the other hand, when it exceeds 3.0 μm, there is a problem that the transparency is not sufficient.
The adhesion amount of the ultraviolet shielding agent to the fabric is usually about 1.0 to 30.0% by weight, preferably about 2.0 to 20.0% by weight. When the adhesion amount is less than 1.0% by weight, the light fastness is hardly improved. On the other hand, when it exceeds 30.0% by weight, the amount of binder used for fixing the particles increases, and the flexibility of the fabric increases. There is a problem with air permeability.

In the print printing of the present invention, the above-mentioned pigments and ultraviolet shielding agents are used as printing pastes obtained by adding a binder thereto.
Here, the binder is not particularly limited, but a polyurethane polymer, a polyacrylic polymer, a polyamide polymer, a polyester polymer, a polyethylene polymer, a polypropylene polymer, a polyvinyl chloride polymer, A water-based emulsion such as a polyvinylidene chloride polymer, a polyfluorine-based polymer, or a silicone-based polymer, or a combination of a water-based emulsion of a prepolymer of each polymer and a crosslinking agent may be used. In particular, one or more selected from the group consisting of a polyurethane polymer, a polyacrylic polymer, a polyamide polymer, and a polyester polymer in terms of flexibility, washing durability, hydrolysis resistance, cost, etc. Those used in combination with water-based emulsions are more preferred.
Examples of the crosslinking agent include acrylic acid, methacrylic acid, hydroxyalkyl acrylate, hydroxyalkyl methacrylate, glycidyl acrylate, glycidyl methacrylate, acrylamide, methacrylamide, methylol acrylamide, vinyl ethylene urea, acrolein, ketene dimer, vinyl isocyanate, divinyl sulfone. A reactive compound having a functional group such as is used.
The adhesion amount of the binder (including a crosslinking agent used as necessary) is usually 10 to 70% by weight, preferably 20 to 60% by weight.
The ratio of the printing paste is 0.05 to 30.0% by weight for the pigment, preferably 0.1 to 20.0% by weight, and 1.0 to 30.0% by weight for the ultraviolet shielding agent, preferably 2. 0 to 20.0% by weight, binder (in terms of solid content, including crosslinking agent) is 10 to 70.0% by weight, preferably 20.0 to 60.0% by weight (however, pigment + ultraviolet shielding agent + binder ( (Including cross-linking agent) = 100 wt%).

Further, in the print textile printing of the present invention, it is preferable that a phosphorus-based and / or halogen-based flameproofing agent is used in combination in order to further improve the flame retardancy.
Preferable examples of the phosphorus flame retardant include phosphate esters, phosphonate esters, and phosphazene oligomers.
Furthermore, as the phosphate ester, a compound represented by the following formula (I) is suitable.

[Wherein X is hydroquinone, resorcinol, bis (4-hydroxydiphenyl) methane, bisphenol A, dihydroxydiphenyl, dihydroxynaphthalene, bis (4-hydroxyphenyl) sulfone, bis (4-hydroxyphenyl) ketone, and bis ( It is a divalent group derived from a compound selected from the group consisting of 4-hydroxyphenyl) sulfide. n is an integer of 0 to 5, and is an average value of 0 to 5 in the case of a mixture of phosphate esters having different n numbers. R ¹¹ , R ¹² , R ¹³ , and R ¹⁴ each independently comprise phenol, cresol, xylenol, isopropylphenol, butylphenol, and p-cumylphenol substituted or unsubstituted with one or more halogen atoms. It is a monovalent group derived from a compound selected from the group. ]

More preferably, X in the above formula is a divalent group derived from a compound selected from the group consisting of hydroquinone, resorcinol, bisphenol A, and dihydroxydiphenyl, and R ¹¹ , R ¹² , R ¹³ , And R ¹⁴ are each independently a monovalent group derived from a compound selected from the group consisting of phenol, cresol, and xylenol, which are substituted or more preferably substituted with one or more halogen atoms; A compound containing as a main component a component in which n is an integer of 1 to 3 can be mentioned.

As the halogen flame retardant, an organic halogen flame retardant is preferable.
Examples of the organic halogen flame retardant include halogenated carbonate oligomer, halogenated epoxy compound, halogenated polystyrene, halogenated triazine compound, halogenated diphenylalkane compound, halogenated indane compound, and halogenated aromatic phthalimide compound. Among them, a halogenated carbonate oligomer and a halogenated epoxy compound are preferable because they are excellent in compatibility with polycarbonate and have good heat resistance and thermal stability.

The adhesion amount of the above flameproofing agent is usually 5.0 to 50.0% by weight, preferably 10.0 to 40.0% by weight.
In addition, in the flame retardant, titanium oxide, silicon dioxide, zinc oxide, basic zinc carbonate and white lead, basic zinc sulfate, lead sulfate, zinc sulfide, cerium oxide, zirconium oxide, tungsten oxide, tin oxide, An inorganic flameproofing agent such as barium sulfate, antimony trioxide, and aluminum hydroxide can be blended in an amount of about 5.0% by weight or less.

The printing textile printing of the present invention is a printing paste mainly composed of the above pigment and ultraviolet shielding agent (and, if necessary, the above flameproofing agent) and a binder, for example, about 2,000 to 50,000 cPs suitable for printing. The viscosity may be adjusted and printed using a screen of 300 to 2,000 mesh. The screen at this time may adopt a flat or rotary method.
After printing and printing, after drying at 120 to 150 ° C. for 2 to 5 minutes, heat treatment may be performed at 150 to 170 ° C. for 2 to 5 minutes.

  In the fully aromatic polyamide fiber fabric printed and printed according to the present invention, the portion printed and combined with the above pigment and UV shielding agent need not be the entire surface, and may be a part of the fabric. The printed textile portion is usually 30 to 70%, preferably about 50 to 70%, and is appropriately determined depending on the design properties, the design, and the contents required by the customer.

In the present invention, when performing the above printing, the hue particularly effective for improving the light fastness is when the lightness L ^{* of} the fabric is 30.0 or more.
Here, the lightness L ^* is defined by JIS Z 8729, and is a value measured using a color measuring device “Machbeth COLOR-EYE” manufactured by Macbeth Co., Ltd., using a D65 light source with a 2-degree field of view. is there. When the lightness L ^* is less than 30.0, it is a dark color, so that light discoloration resistance is small.

Further, the fully aromatic polyamide fiber fabric printed and printed according to the present invention preferably has a light fastness when irradiated with light at 63 ° C. for 20 hours with a fade meter, preferably 4 or more, more preferably 4 to 5 grades. It is.
Here, the light fastness is specifically a value measured according to JIS L 0842 method.
If the light fastness is less than 4th grade, the discoloration becomes large, which is not preferable.
In order to increase the light fastness to 4.0 or more, a pigment and an ultraviolet shielding agent may be used in combination.

Furthermore, the fully aromatic polyamide fiber fabric printed and printed according to the present invention preferably has a strength retention after light irradiation at 63 ° C. for 40 hours with a fade meter of 70.0% or more, more preferably 70 to 90%. is there.
The strength retention is a value obtained by irradiating light according to, for example, JIS L 0842, and then measuring the sample according to JIS L 1096 A.
In order to increase the strength retention to 70.0% or more, it is only necessary that the sample is hardly damaged by light. For example, a pigment and an ultraviolet shielding agent may be used in combination.

The print-printed wholly aromatic polyamide fiber fabric of the present invention thus obtained is particularly suitable for use in flame retardant work clothes and flame retardant protection by using the fabric as a surface layer, a lining, or an intermediate layer. Used for clothes.

Hereinafter, the present invention will be described in more detail by examples. In the examples, parts and% are based on weight. Moreover, each physical property in an Example was measured with the following method.
(1) Primary particle diameter The ultraviolet screening agent was observed with an electron microscope at a magnification that allows the diameter to be measured, and the image was recorded by taking a photograph. On the photograph taken, the diameter of the ultraviolet shielding agent was measured, and the diameter was determined by dividing by the magnification. The diameter of one particle was an average value of measurements at 5 to 8 locations, the same operation was performed on around 100 particles, and the average particle size was obtained to obtain the primary particle diameter.
(2) High temperature light resistance test Light resistance was evaluated after light irradiation at 63 ° C. for 20 hours and 40 hours with a fadeometer in accordance with JIS L 0842 method. Evaluation is based on daylight in the north sky (daylight from 3 hours after sunrise to 3 hours before sunset, and not affected by environmental colors such as interiors of surrounding buildings and rooms). Or JIS)
Using a regular light source D65 defined for Z8720, it was performed at a brightness of 660 lx or higher (about 1,000 lx is most desirable).
The light beam was applied to the surface at an angle of about 45 °, and the viewing direction was approximately perpendicular to the surface of the specimen and the gray scale. The determination at that time was performed using a blue scale for determining light fastness.
(3) Lightness L ^*
L ^* was measured using a color measuring device “Machbeth COLOR-EYE” manufactured by Macbeth Co., Ltd., using a D65 light source.
(4) Tensile strength of fabric Measured according to JIS L 1096 A method.
(5) Strength retention The strengths of the sample before the light resistance test and the sample irradiated with light for 40 hours are measured by the method described in (2) above, and are set as S ₀ and S ₄₀ , respectively. The strength retention was determined as follows.
Strength retention (%) = (S ₄₀ / S ₀ ) × 100
(6) LOI value Based on JIS L 1096 E method, it was set as the oxygen concentration required to continue burning 50 mm or more.

Example 1
Meta-type aramid fiber (1.7 dtex cut length 51 mm, manufactured by Teijin Techno Products, trade name: Conex) and para-type aramid fiber (1.7 dtex cut length 51 mm, manufactured by Teijin Techno Products, trade name: Technora), flame retardant rayon ( 2.2dtex cut length 51mm (made by Lenzing)) Weaved into 2/1 twill using spun yarn (40/2) (British count) made of heat-resistant fiber mixed at a weight ratio of 30:20:50 A woven fabric (weighing 200 g / m ² , LOI value = 28.6) was prepared and scoured by a known method to remove the glue and oil on the fabric surface.
When printing with a Macbeth measuring machine, when printing L ^* to 43.9, 2.2 parts Ryudai W Yellow FF3R (manufactured by Dainippon Ink & Chemicals, Inc.), Ryudai W Brown FFR (large) Nippon Ink Chemical Co., Ltd.) 0.5 part, Ryudai W Brilliant Torbin FF2B (Dainippon Ink Chemical Co., Ltd.) 0.2 part, Hibic Blue
Ultraviolet rays in which 0.5 parts of FBG (manufactured by Gokoku Color Co., Ltd.), 30% titanium dioxide (primary particle size = 0.2 μm), acrylic resin, water, ethylene glycol, and mineral spirit are emulsified and dispersed with a surfactant. 15 parts of shielding material, urethane resin, mineral spirit, 60 parts of paste for pigment printing in which water is emulsified and dispersed with a surfactant (solid content concentration 13%), difficulty consisting of halogenated aromatic compound and antimony trioxide Printing paste containing 10 parts of a flame retardant (manufactured by Nikka Chemical Co., Ltd., Neosticker FRC-105) and 2 parts of a commercially available binder for crosslinking (manufactured by Meisei Chemical Industry Co., Ltd., SU-125F) (total solid content concentration = 29%) , Viscosity = 8,000 cPs), using a rotary printing machine (manufactured by Ichikin Kogyo Co., Ltd.), drying at 150 ° C. for 2 minutes, and heat treatment at 160 ° C. for 3 minutes. By pudding Printing was carried out. The printed area was 30%.
At this time, the adhesion amount of the pigment is 3.5%, the adhesion amount of titanium dioxide (ultraviolet shielding agent) is 16.0%, the adhesion amount of the flame retardant is 24.5%, the adhesion amount of the binder (solid content conversion, cross-linking) (Including the agent) was 27.7%.
At this time, the light fastness was 4-5 grade, and the strength retention was good with 78.2%.

Comparative Example 1
In the same manner as in Example 1, textile printing was performed using pigments of the same color without using an ultraviolet shielding agent.
The light fastness at this time was 3-4 grade, the strength retention was 61.7%, and neither the light fastness nor the strength retention was satisfactory.

Comparative Example 2
In the same manner as in Example 1, as dye for dyeing so that L ^* is 43.7, 0.6 parts of indanthrene blue CLF (manufactured by DyStar Ltd), 0.15 part of indanthrene red FFB (manufactured by DyStar Ltd), Mikeslen Gold Orange G (DyStar Ltd) 0.74 parts, Indanthrene Yellow F3GC (DyStar
Ltd.) 0.27 parts and a dyeing solution (solid content concentration = 2.5%) containing 15 parts of a commercially available migration inhibitor (sodium alginate solution) is applied to the fabric with a roller dryer (manufactured by Kyoto Kikai Co., Ltd.) After drying, a pad steamer (manufactured by Shandong Iron Works) was applied with an aqueous solution containing hydrosilite 25 g / l and caustic soda 50 g / l, and the dye was fixed by steaming with saturated steam. Color was developed. Thereafter, the excess dye and the migration inhibitor were washed away by washing with water and hot water, and dyed to a uniform color.
At this time, the light fastness was Grade 3, the strength retention was 55.5%, and neither the light fastness nor the strength retention was satisfactory.

Example 2
In the same manner as in Example 1, 8 parts of Ryudai W Yellow FF3R (manufactured by Dainippon Ink & Chemicals, Inc.) and Ryudai W Red FB CONC (Dainippon Ink) were used as textile printing pigments so that L ^* was 33.0. (Made by Chemical Industry Co., Ltd.) 0.15 parts, Hivic Blue
FBG (manufactured by Gokoku Color Co., Ltd.) 0.85 parts, 30% titanium dioxide (primary particle size = 0.2 μm), ultraviolet light emulsified and dispersed with surfactant, acrylic resin, water, ethylene glycol and mineral spirit 3 parts of shielding agent, urethane resin, mineral spirit, 70 parts of paste for pigment printing in which water is emulsified and dispersed with surfactant (solid content concentration 13%), difficulty consisting of halogenated aromatic compound and antimony trioxide Printing paste (total solid content concentration = 10 parts) containing 10 parts of a flame retardant (manufactured by Nikka Chemical Co., Ltd., Neosticker FRC-105) and 5 parts of a commercial crosslinking agent for binder (manufactured by Meisei Chemical Industry Co., Ltd., SU-125F) After printing with a rotary printing machine (manufactured by Ichikin Kogyo Co., Ltd.) using 22.0%, viscosity = 9,000 cPs), it was dried at 150 ° C. for 2 minutes and then heat treated at 160 ° C. for 3 minutes. By performing The cement printing was carried out. The printed area was 40%.
At this time, the adhesion amount of the pigment is 12.3%, the adhesion amount of the titanium dioxide (ultraviolet shielding agent) is 4.5%, the adhesion amount of the flame retardant is 32.3%, the adhesion amount of the binder (solid content conversion, cross-linking) (Including the agent) was 43.7%.
The light fastness was grade 5 and the strength retention was 75.3%, and both the light fastness and strength retention were good.

Comparative Example 3
In the same manner as in Example 1, L ^* is 28.5 and 13 parts of Ryudai W Yellow FF3R (manufactured by Dainippon Ink & Chemicals, Inc.) as a printing pigment, Ryudai W Red
FFGR (Dainippon Ink Chemical Co., Ltd.) 2.6 parts, Hibic Blue
3RU (Dainippon Ink Chemical Co., Ltd.) 0.7 parts, Ryudai W Black RC (Dainippon Ink Chemical Co., Ltd.) 0.2 parts, urethane resin, mineral spirit, water is emulsified and dispersed with surfactant. Pigment printing paste (solid content concentration 13%) 76 parts, commercially available binder for binder (manufactured by Meisei Chemical Industry Co., Ltd., SU-125F), printing paste (total solid content concentration = 15.4%) , Viscosity = 8,000 cPs), printing on a rotary printing machine (manufactured by Ichikin Kogyo Co., Ltd.), drying at 150 ° C. for 2 minutes, and heat treatment at 160 ° C. for 3 minutes. Printing was performed. The printed area was 20%.
At this time, the adhesion amount of the pigment was 32.0%, and the adhesion amount of the binder (in terms of solid content, including the crosslinking agent) was 68.0%.
The light fastness was grade 5, the strength retention was 72.1%, and the lightness L ^* was less than 30.0, both of which were good without using titanium dioxide in combination with the pigment.

According to the present invention, a fabric made of wholly aromatic polyamide fiber having excellent light fastness, particularly in the region where the lightness L ^{* of the} fabric is 30.0 or more, utilizing the characteristics of wholly aromatic polyamide fiber, Useful for work clothes and flame retardant protective clothing.

Claims (11)

A cloth made of wholly aromatic polyamide fiber colored by printing, wherein the printing is performed by using a pigment and an ultraviolet shielding agent together , and the amount of the pigment attached to the cloth is 0.05 to 30 0.0% by weight, and the UV screening agent has a primary particle size in the range of 0.1 to 3.0 μm, titanium oxide, silicon dioxide, zinc oxide, basic zinc carbonate, white lead, basic zinc sulfate, lead sulfate, It is at least one selected from the group consisting of zinc sulfide, cerium oxide, zirconium oxide, tungsten oxide, tin oxide, antimony oxide, and barium sulfate, and the adhesion amount of the ultraviolet shielding agent to the fabric is 1.0 to A wholly aromatic polyamide fiber fabric characterized by being 30.0% by weight .   2. The wholly aromatic polyamide fiber fabric according to claim 1, wherein the fabric is partially printed with a pigment and an ultraviolet shielding agent. The lightness L ^{* of the} wholly aromatic polyamide fiber fabric is 30.0 or more, and the light fastness when irradiated with light by a fade meter at 63 ° C for 20 hours is 4 or more. Wholly aromatic polyamide fiber fabric. The proportion of printing paste used for printing is 0.05 to 30.0% by weight of pigment, 1.0 to 30.0% by weight of UV shielding agent, and 10 to 70.0% by weight of binder in terms of solid content. % (However, pigment + ultraviolet shielding agent + binder = 100% by weight), and the amount of printing paste adhered to the fabric is 7-80 g / m in terms of solid content after drying. ² The wholly aromatic polyamide fiber fabric according to any one of claims 1 to 3. The fabric weight is 180 to 350 g / m ² The wholly aromatic polyamide fiber fabric according to any one of claims 1 to 4.   The cloth is a cloth containing 60.0% by weight or less of other fibers, and has a limiting oxygen index (LOI) defined by the JIS L 1096 E method of 26.0 or more. The wholly aromatic polyamide fiber fabric described.   The other fiber is at least one fiber selected from the group consisting of flame retardant rayon, flame retardant cotton, flame retardant wool, flame retardant polyester fiber, flame retardant vinylon fiber, flame retardant acrylic fiber, and novolak fiber. Item 7. The wholly aromatic polyamide fiber fabric according to any one of Items 1 to 6.   The wholly aromatic polyamide fiber fabric according to any one of claims 1 to 7, which has a strength retention of 70.0% or more after light irradiation at 63 ° C for 40 hours by a fade meter.   The wholly aromatic polyamide fiber fabric according to any one of claims 1 to 8, wherein a phosphorus-based and / or halogen-based flameproofing agent is used in combination in printing.   A flame-retardant work wear using the wholly aromatic polyamide fiber fabric according to claim 1 at least in part. A flame retardant protective clothing using at least a part of the wholly aromatic polyamide fiber fabric according to claim 1.