JP2000290849A - Spun yarn containing dyed para-based aramid staple fiber and fabric using the same - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain a spun yarn having excellent dyeability, light resistance, cut damage resistance, heat resistance and abrasion resistance, useful for sport wear, or the like, by making the spun yarn include a specific amount of a dyed para-based aramid staple fiber. SOLUTION: In this spun yarn comprising a dyed para-based aramid staple fiber such as a polyparaphenylene terephthalamide staple fiber and a synthetic fiber staple fiber such as a polyester staple fiber, a polyamide staple fiber, or the like, (the ratio used is preferably 7-85 wt.% based on the spun yarn), the dyed para-based aramid staple fiber amounts to 3-20 wt.% of the spun yarn. Preferably, the tensile strength of the para-based aramid fiber before dyeing is >=15 g/d, the crystal size (110 direction) is 30-55 Å, the aramid fiber always maintains >=8 wt.% water content before dyeing, the single fiber fineness of the dyed para-based aramid staple fiber and the synthetic fiber staple fiber is <=2.5 denier. Preferably a fabric is produced by using the spun yarn.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

TECHNICAL FIELD The present invention relates to a dyeing property, light fastness,
The present invention relates to a spun yarn having excellent cut resistance, abrasion resistance, and heat resistance, and a fabric using the spun yarn. More specifically, the present invention relates to a spun yarn useful in outdoor sports clothes and colorful sports clothes worn in a harsh environment, and a fabric using the spun yarn.

[0002]

2. Description of the Related Art In recent years, there has been a remarkable increase in the number of participants in outdoor sports such as skiing and mountain climbing, and fishing and snowboarding. As a result, clothing materials have become more resistant to cutting edges and sharp edges against sharper blades and ski edges. What is desired is a material having further improved abrasion resistance and further functionality such as heat resistance of cigarettes against fire and sparks and having a rich color.

[0003] On the other hand, Japanese Patent Publication No. 1-36006 discloses a method in which a filament or spun yarn of 100% para-aramid fiber having high abrasion resistance and high yarn strength is partially used to form a cross-woven fabric. And JP-B-62-26900, all of which can only improve the tear strength, but do not improve the heat resistance and cut wound resistance. Moreover, since the interwoven portion of these yarns is not dyed, there is a drawback that they appear as streaks.

On the other hand, Japanese Patent Application No. 1-112993 discloses a woven fabric made of 100% filament yarn or spun yarn made of 100% para-aramid fiber. In this case, tear resistance and cut resistance are obtained. Is greatly improved, but there is a drawback that conventional para-aramid fibers cannot be dyed. JP-A-6-220730 discloses a blend of polyester staple fiber and para-aramid staple fiber in a small amount (5 to 15% by weight). However, color clarity is poor because para-aramid fiber is not dyed. Therefore, there is a disadvantage that it is not possible to dye colorful or dark colors.

[0005] That is, the above-mentioned blended yarn fabric is dyed with a disperse dye because it is a polyester blended fabric, but the conventional para-aramid fiber does not dye and shows the original yellow color, so that the fabric as a whole is brightly colored. Could not hope. In addition, there is a disadvantage that light resistance when dyed in a light color is inferior. That is, the para-aramid fiber itself shows yellow and changes its color by light. The light fastness of para-aramid fibers according to JIS L 0842 is 1st class or less. Therefore, the light fastness of the fabric dyed with the disperse dye is affected by the discoloration of the para-aramid fiber, and the light fastness is particularly poor when the entire fabric is dyed light.

Generally, high-strength fibers such as para-aramid fibers are excellent in cut resistance, abrasion resistance and heat resistance, but have high crystallinity, and can be dyed by a dyeing technique applied to other general-purpose fibers. At present, it is difficult to dye para-aramid fibers, and the following improvement measures have been proposed.

JP-A-63-256765 discloses a method utilizing a swelling effect by vacuum decompression, and JP-A-1-111014 discloses a soaking method for dispersing a dye or pigment in a concentrated sulfuric acid spinning bath. JP-A-2-41414, JP-A-2-41414, and JP-A-2-41414 disclose a para-aramid fiber capable of being cationically dyed by contact with an accelerator.
An aramid fiber obtained by copolymerizing oxydiphenyl terephthalamide is treated with an aqueous dispersion of a disperse dye having a molecular weight of 400 or less as 1
Japanese Patent Application Laid-Open No. H5-25-2
No. 09372 is proposed.

[0008] However, all of these proposals have a problem that the range of hue and degree of dyeing that can be colored is limited, and it is difficult to dye a deep color, so that conventional dyeing equipment cannot be used.

[0009]

SUMMARY OF THE INVENTION It is an object of the present invention to provide a blended yarn of para-aramid fiber and a fabric obtained by using the same to eliminate poor dyeing and light fastness, and to provide excellent cut and abrasion resistance. By providing spun yarns and fabrics that have heat resistance and can be dyed in various hues such as dark colors, and have clear coloring, and sports clothing, outdoor clothing, work clothing and the like made of them. is there.

[0010]

The spun yarn of the present invention which has excellent dyeability, light resistance, cut resistance and heat resistance has the following constitution in order to solve the above problems. That is, (1) in a spun yarn containing dyed rose-based aramid short fibers and synthetic fiber short fibers, the ratio of the dyed rose-based aramid short fibers to the spun yarn is 3 to 20% by weight. And spun yarn.

(2) The spun yarn according to (1), wherein the para-aramid short fibers are polyparaphenylene terephthalamide short fibers.

(3) In a spun yarn containing dyed para-aramid short fibers and synthetic short fibers, the tensile strength of the para-aramid fibers before dyeing is 15 / d or more and the crystal size (110 direction) is (1) or (2), which is a dyeable para-aramid staple fiber formed by keeping the water content before dyeing always at least 8%. Spun yarn.

(4) The synthetic fiber short fibers are polyester or polyamide, and the ratio of the polyester short fibers or polyamide short fibers to the spun yarn is 7 to 85% by weight. ).

(5) The dyed para-aramid staple fiber is made into a dope for spinning from polyparaphenylene terephthalamide (PPTA) having an intrinsic viscosity (ηinh) of 5 or more and concentrated sulfuric acid. Once spun into the air through the holes, immediately lead to water and solidify, high strength,
In a method in which a step of forming a filament having a high elastic modulus, a step of forming a staple by cutting the filament by crimping, and a step of dyeing the staple are carried out in separate steps without continuation, The aramid staple fiber has a tensile strength of 15 / d or more and a crystal size (1
(10 directions) is 30 to 55 angstroms, and is formed while always maintaining the water content before dyeing at 8% or more. Spun yarn.

(6) The method according to any one of (1) to (5), wherein the dyed para-aramid short fibers and synthetic short fibers have a single fiber fineness of 2.5 denier or less. Spun yarn.

(7) A fabric using the spun yarn according to any one of (1) to (6).

[0017]

DETAILED DESCRIPTION OF THE INVENTION As is well known, para-aramid fibers have much higher strength and heat resistance than ordinary synthetic fibers, and have almost no elongation. Therefore, wear materials, packing, belts, cables, tires, hoses, etc., mainly in the field of industrial materials and protective gloves, protective clothing such as aprons, and also in the general clothing field,
Dyeing is difficult and light resistance is poor, which is a major obstacle.

On the other hand, synthetic fibers mainly composed of polyester have been widely used in the field of apparel with further advancement in quality and function as well as advancement of post-processing technology in recent years. However, if only a small amount of this para-aramid fiber is mixed into a general synthetic fiber staple in a short fiber state, the cut resistance, abrasion resistance and heat resistance are remarkably improved. The use of the dyeable para-aramid staple fiber of the present invention makes it possible to dye dark colors and various colorful hues, which have been difficult until now.

In addition, the light resistance of the fabric blended with the para-aramid fiber in light color dyeing is improved, so that it can be applied to summer clothing with many light color systems.

Hereinafter, the present invention will be described in detail.

The dyeable para-aramid fiber used in the present invention is prepared by spinning a dope from PPTA having a specific viscosity (ηinh) of 5 or more and concentrated sulfuric acid, and passing the dope through the pores of a spinneret once in air. In a method in which a step of forming a high-strength, high-modulus filament and a step of dyeing the filament are carried out in separate steps without continuation,
Tensile strength of para-aramid short fibers before dyeing is 15 g / d
As described above, it can be produced by maintaining the crystal size (110 direction) of 30 to 55 angstroms and always maintaining the water content before dyeing at 8% or more.

In the present invention, the intrinsic viscosity IV (ηin
h) was measured by the following method.

Intrinsic viscosity IV (ηinh) = (1n · ηrel) / c where c is the concentration of the polymer solution (0.5 g of polymer in 100 mL of solvent) and ηrel (relative viscosity) is the capillary viscosity Is the ratio between the flow time of a polymer solution and its solvent when measured at 30 ° C. using a meter] to define the intrinsic viscosity (IV).
The intrinsic viscosity value in the present invention is concentrated sulfuric acid (96% H ₂ SO
_This is a value measured using ₄ ).

In view of required strength characteristics, it is desirable that the fiber has a tensile strength of 15 g / d or more and an elongation at break of 2 to 5%.

The para-aramid in the present invention is a polymer obtained by polycondensation of terephthalic acid and para-phenylenediamine, but a polymer obtained by copolymerizing a small amount of a dicarboxylic acid and a diamine can also be used. The dyeable para-aramid fiber of the present invention makes an optically anisotropic dope from PPTA and concentrated sulfuric acid having an intrinsic viscosity (ηinh) of 5 or more,
The dope is once spun into the air through the pores of a spinneret, immediately led into water and solidified, guided to a Nelson roller, neutralized with an aqueous sodium hydroxide solution, slightly dried by a hot roll through a washing step, It is obtained by passing the step of winding as a filament into a tube without interruption. The wound para-aramid fiber is packaged with a polyethylene film or the like so as not to dry before the dyeing step. Also, the wound para-aramid fiber is crimped and cut, and is sealed with a polyethylene film or the like so as not to be dried during the staple-less dyeing step.

The intrinsic viscosity of the PPTA used in the present invention (ηi
nh) is preferably 5 or more. Intrinsic viscosity (ηinh) is 5
If it is less than 1, it is difficult to obtain high-strength, high-modulus fiber physical properties.

It is important that the para-aramid fiber of the present invention has a crystal size (110 directions) of 30 to 55 angstroms and a water content of always at least 8%. When the crystal size is less than 30 angstroms, the densification of the fibers is insufficient and high-strength, high-modulus fiber properties cannot be obtained, and when it exceeds 55 angstroms, dyeing becomes difficult.

Here, the fact that the water content is always 8% or more means that 8%
What follows is that it has no dry history. If dried so that the water content is less than 8%, the structure becomes dense and dyeing becomes difficult. Even if water is added again, the dyeability does not recover. Preferably, the water content of the para-aramid fiber is preferably 15 to 48%. In order to achieve such a water content, the spun para-aramid fiber is used in an amount of 100 to 150.
It is desirable to dry at a low temperature for 5 to 20 seconds. If the drying temperature is lower than 100 ° C., it is difficult to remove water, which causes a problem in handling after winding the tube. If the temperature exceeds 150 ° C., crystallization proceeds and dyeing becomes difficult. When the moisture content exceeds 50%, the resistance of the yarn path guide increases, and it becomes difficult to wind up the filament. In the present invention, the dyeing method for dyeing para-aramid fibers having such physical properties does not require special equipment or a special method, and existing dyeing equipment for synthetic fibers can be used. It is achieved by adjusting the pH by adding appropriate amounts of dyes, auxiliaries and acids, starting the dyeing at 60 ° C., heating to 130 ° C. in 60 minutes and dyeing for 30 minutes. As the dye, a cationic dye, a disperse dye, or the like can be used, but a cationic dye that easily penetrates into a dense structure is preferable.

The dyed para-aramid fiber staple is crimpered with a dyed para-aramid fiber filament, crimped, and cut to a length suitable for spinning, for example, usually 1.5 to 6 inches by square cutting, and colored. Obtainable.

Stapling is also performed by variable cutting with an average fiber length of ± 2 inches, and may be performed by a stapling method in which a long fiber is cut by a speed difference between a pair or more rollers holding the long fiber.
The dyeing process may be performed on filaments or subtows before stapling or after stapling.

Next, an example of a dyeing method in which the dyeable para-aramid short fiber is dyed dark green will be described.

Owf indicates the weight% of the dye based on the weight of the dried fiber. g / 1 indicates the weight ratio of the auxiliary to 1 liter of the prepared dyeing bath.

Dye (cationic dye): Astrazon Yellow 7 GLL (CI Yellow 21) (manufactured by Bayer) 0.1% owf Keyacryl Red GL (CI Red 29) (manufactured by Nippon Kayaku) 2.0% owf Aizen BRLH (Manufactured by Hodogaya Chemical Co., Ltd.) 8.0% owf Auxiliary agent: "Neodespon AC" (manufactured by Morin Chemical Co., Ltd.) 2 g / 1 acetic acid 20 g / 1 sodium nitrate 20 g / 1 "Teryl carrier A111" (manufactured by Meisei Chemical Co., Ltd.) 20 g The dyeing was started at 60 ° C. at a bath ratio of 1:15, the temperature was raised to 130 ° C. in 60 minutes, and the dyeing was performed for 30 minutes. After the dyeing, the substrate was reduced and washed in a bath containing a nonionic surfactant and a reducing agent at 80 ° C. for 20 minutes. After dehydration and drying, a surfactant was applied by a dipping method for the purpose of preventing static electricity and improving spinnability. JIS L 08
The color fastness to No. 42 was tertiary and extremely high as a para-aramid fiber.

The dyed para-aramid fiber has been described above as the dyed wholly aromatic polyamide fiber. The para-aramid fiber used in the present invention includes, for example, polyparaphenylene terephthalamide fiber and copolyparaphenylene fiber. It is a high-strength para-aramid fiber having a strength of 15 g / d or more, such as -3,4, oxydiphenylene terephthalamide fiber. The dyed para-aramid staple fibers composed of these para-aramid fibers can be used in the usual spinning methods such as wool spinning and short fiber spinning.

The mixing ratio of the synthetic fiber staple and the dyeable para-aramid short fiber of the present invention is 97: 3 to 80:20.
In the range. If the para-aramid short fiber content is less than 3% by weight, the heat resistance of cigarettes against fire or abrasion heat cannot be obtained. On the other hand, when the para-aramid short fiber exceeds 20% by weight, cut resistance and tear strength decrease. However, when the blending rate of the para-aramid short fiber further increases and exceeds 60% by weight, the cut resistance and tear strength are again improved as is apparent from the relationship between the blending rate and the yarn strength in Table 1. This behavior can be explained as follows. Due to the large difference between the breaking elongation of para-aramid fiber (2 to 5%) and the breaking elongation of synthetic fibers such as nylon and polyester (about 35%), the elongation of Stress concentrates on the low para-aramid fiber, the para-aramid fiber cuts, and then the high elongation synthetic fiber cuts. Therefore, it does not become the sum of the fibers constituting these blended yarns. When the blend ratio of the para-aramid fiber is about 30%, the strength of the blended yarn shows the lowest value. When the para-aramid fiber is 60% or more, the contribution of the high-strength para-aramid fiber becomes remarkable.

However, a product containing a high content of para-aramid fiber has a poor spinning processability, and has a rough texture, which is not desirable as general clothing.

[0037]

[Table 1]

The single fiber fineness of the staple is preferably 2.5 d or less for both the synthetic fiber and the dyeable para-aramid fiber of the present invention. If the single fiber fineness exceeds 2.5 d, the number of fibers constituting the spun yarn is reduced, so that it is difficult to produce a spun yarn thinner than 30 ^S / 1 count, which limits the development to clothing fabrics, which is not preferable. . Rather, the fineness of the single fiber is preferably small because the para-aramid fiber has a high flexural rigidity.

The synthetic fiber staple may be any of nylon, polyester and acrylic, but polyester is best in terms of dimensional stability, setability, versatility and productivity, and polyamide is best in terms of wear resistance and dyeability. It is.

The dyed para-aramid fiber of the present invention has properties of a tensile strength of 15 to 30 g / d, a breaking elongation of 2 to 5%, and a thermal decomposition onset temperature of 500 ° C.

As a method of designing a woven fabric from the spun yarn of the present invention, the yarn of the present invention may be used for (a) both warp and weft, (b) only for warp, (c) only for weft, etc. Is raised. As a method of designing a knit, (d) using 100% of the yarn of the present invention, or (e) cross-knitting with a normal yarn so as to be arranged on only one side of the fabric can be mentioned.

Next, preferred embodiments for obtaining the spun yarn and fabric of the present invention will be described. After mixing the dyed para-aramid staple fibers and synthetic staple fibers of the present invention having a predetermined monofilament fineness and a predetermined fiber length in a predetermined ratio in a batting process, carding and kneading in a spinning process are performed by a conventional method. A spun yarn can be obtained through the steps of stripping, roving and spinning. Here, in particular, the weft twist coefficient is set to 3.5 which is higher than normal (about 3.3).
When the ratio is set to 4.1 to 3.8, and more preferably to 3.8 to 4.1, cut resistance and wear resistance are significantly improved, and the quality is further improved.

Here, the twist coefficient K is K = number of twists (times / in)
/ (Count) The value obtained by ^1/2 .

Next, the woven or knitted fabric of the present invention is obtained by using the spun yarn thus obtained as a warp and / or a weft, and weaving a woven fabric having a predetermined texture with a predetermined warp density by a conventional method. Obtainable.

[0045]

The present invention will be described below with reference to examples. The physical properties in the examples were based on the following measurements. <Crystal size> A wide-angle X-ray diffraction method was used.

X-ray breaking apparatus: 40 manufactured by Rigaku Denki Co., Ltd.
36A2 type X-ray source: CuKα ray (using Ni filter) Curved crystal monochromator (using graphite) <Intrinsic viscosity> Intrinsic viscosity IV = (ηinh) is 98.5
A solution prepared by dissolving the polymer at a concentration (C) of 0.5 g / d1 in concentrated sulfuric acid of weight% is measured at 30 ° C. by a conventional method.

(Ηinh) = (ln · ηrel) / c (where ln is a natural logarithm) <Strength and elongation characteristics of fiber> The tensile strength and tensile modulus (initial tensile resistance) of the yarn are determined according to JIS L1013. Was. <Moisture percentage> The measurement of the moisture percentage was based on JIS L1013.

Deposition moisture content (%) = (W-W1) × 100
/ W1 Here, W: mass at the time of sampling W1: mass at the time of absolute drying of the sample <Stainability (L value)> Measurement of L value is based on JIS Z 8729
Followed. The measuring instrument is Macb manufactured by Sumika Chemical Analysis Service, Ltd.
eth Color Eyes 3000 was used.

In the case of the same hue, the smaller the numerical value, the better the dyeing. <Light fastness (light fastness)> The light fastness is JIS L084.
2 was followed.

In the case of the same hue, the larger the numerical value, the better the light resistance. <Cut resistance> Two sample sheets are gripped at the center of the frame at an interval of about 3 mm, and a ceramic blade having two edges with a 60-degree angle at the slit portion of the sample sheet is vertically inserted. The sample sheet is cut upright when a load is applied to the cutting edge at a speed of 500 mm / min, and the maximum load is measured. <Wear strength> Measured according to JIS-L1096 "General fabric test method". <Soft melting property (tobacco heat melting property)> The degree of piercing when a sample is brought into contact with the tip of a metal rod (about 0.6 cm in diameter) heated to 360 ° C for 5 seconds is grade 5 (no piercing). Judgment is made in five grades of 1st grade (completely open holes). [Example 1, Comparative Example 1] PPTA obtained by a usual method
(Ηinh = 6.5) is dissolved in 99.9% concentrated sulfuric acid,
A spin dope having a polymer concentration of 19.0% and a temperature of 80 ° C. is spun into the air for a short time from a die having a diameter of 0.06 mm and a diameter of 1000, and then guided into water at 4 ° C. for coagulation. , Guided to a Nelson roller, neutralized with 8% sodium hydroxide aqueous solution, washed with water, and washed with hot roller.
A process of drying at 10 ° C. for 15 seconds and winding the film into a plastic tube without interruption, and a para-aramid fiber filament yarn having a total fineness of 1500 deniers (equivalent to absolute dryness) comprising 1,000 filaments (Example 1)
I got

Without winding the para-aramid fiber of Example 1 into a tube, the para-aramid fiber was guided to a hot roller and heat-treated at 350 ° C. for 10 seconds. A filament yarn (Comparative Example 1) was obtained.

Table 2 shows the physical properties of these para-aramid fibers.
Shown in

[0053]

[Table 2]

These para-aramid fiber filament yarns were dyed dark green under the following conditions. owf indicates the weight% of the dye based on the weight of the dried fiber. g / l indicates the weight ratio of the assistant to 1 liter of the prepared dyeing bath.

Dye: Astrazon Yellow 7 GLL (CI Yellow 21) (manufactured by Bayer) 0.1% owf Kayacryl Red GL (CI Red 29) (manufactured by Nippon Kayaku) 2.0% owf Aizen Cathillon BRLH (Hodogaya Chemical) 8.0% owf Auxiliary agent: "Neodespon AC" (Morin Chemical Co., Ltd.) 2 g / 1 acetic acid 20 g / 1 sodium nitrate 20 g / 1 "Teryl carrier A111" (Meisei Chemical Co., Ltd.) 20 g / 1 para-system Aramid fiber yarn was taken in an absolute dry weight of 10 g, dyeing was started at a bath ratio of 1:15, 60 ° C, and 130 ° C in 60 minutes.
And dyed for 30 minutes. After dyeing, the substrate was washed by reduction in a bath containing a nonionic activator and a reducing agent at 80 ° C. for 20 minutes, dehydrated and dried, and the L value was measured. The L value indicates that the smaller the numerical value, the less the reflection of light and the darker the color. In the case of the same hue, the smaller the numerical value, the better the dyeing. In the dyeing method using the dyeing bath according to the above-mentioned preparation, a level where the L value was 50 or less was determined to be dyed.

The para-aramid fiber of Example 1 adsorbed the dye well, but the para-aramid fiber of Comparative Example 1 was hardly dyed. [Examples 2 and 3] A surfactant was applied to the filament yarn obtained in Example 1 by a dipping method for the purpose of preventing static electricity and improving spinnability.

These filament yarns are crimped at a rate of 6 ridges / inch by a pressing crimper, and 1500 denier (short fiber fineness: 1.5 denier) is cut into 1.5 inches and 2 inches, and cut into 38 mm and 51 mm. Stapled. These staples were kept sealed in a plastic bag until the dyeing step to prevent moisture from drying, and were dyed in a dark green by cotton dyeing according to the dyeing prescription. The physical properties of the staple are fineness 1.5d, fiber length 51mm,
Tensile strength 23 g / d, elongation at break 3%, thermal decomposition onset temperature 5
00 ° C. In Example 2, the same staple and a polyamide short fiber having a fineness of 1.5 d and a fiber length of 51 mm were 90 /
The cotton was blended at a weight ratio of 10 to obtain a blended yarn. Example 3 was obtained by replacing the polyamide short fibers of Example 2 with polyester short fibers. After mixing in the batting process, 40s / 1 passes through the carding, drawing, roving, and spinning processes of the ordinary spinning process.
Was obtained. The twist coefficient was set to 3.7 which is higher than usual.

Next, a flat-woven fabric having a warp density of 130 yarns / in and a weft yarn density of 85 yarns / in was trial-produced by using this yarn for both the warp and the weft. Dye-finished with acid dye to dark green. The polyester blended fabric of Example 3 was dyed and finished to a dark green color using a disperse dye by a conventional method.

100% polyester staple of the same standard
As shown in Table 3, the cut resistance against blades and the like, the wear resistance such as flat abrasion, and the heat resistance and light resistance against frictional heat fusion, cigarette heat fusion, etc. were significantly improved as shown in Table 3. Things were obtained. In addition, although it was dyed dark green, the L value was slightly reduced from 48.2 to 48.8. Since the dyed para-aramid fiber was used, the color development was high as a whole cloth, and the light fastness to dyeing was grade 4 and was excellent as a fabric for clothing.

As described above, according to the present invention, a spun yarn and fabric excellent in cut resistance, abrasion resistance and heat resistance, and having little decrease in color development and light resistance can be obtained.

[0061]

[Table 3]

[Examples 4 to 9, Comparative Examples 2 to 7] Polyester short fibers having a denier of 1.5 denier and a fiber length of 51 mm, and the para-aramid obtained in Example 2 dyed dark green of the present invention. A short fiber having a single fiber fineness of 1.5 denier and a fiber length of 51 mm was used, and the blend ratio was changed to pass through each of the above-described ordinary cotton spinning processes to obtain 40 s / 1.
6 levels (Examples 4 to 6 and Comparative Examples 2 to 4) were obtained. In addition, Examples 4 to 7 are Examples 7 to 9 and Comparative Examples 5 to 7.
6 and Comparative Example 2 to 4 were replaced with polyamide short fibers to obtain spun yarns of 6 levels.

Next, this yarn is used for both the warp and the weft, and the warp density is 127 / in and the weft density is 83 / i.
n was woven into 6 levels of plain woven fabric, passed through each process of ordinary dyeing finish, and dyed and finished to dark green. Tables 4 and 5 show the physical properties of the obtained woven fabric. Further, as Comparative Example 4, the same single fiber fineness of 1.5 denier and fiber length of 5 as in Example 4
Comparative example in which 10% by weight of a 1 mm commercially available non-dying para-aramid short fiber (trade name "Kevlar" (registered trademark of DuPont), manufactured by Dupont Toray Co., Ltd.) and 90% by weight of polyester short fiber are blended. As Comparative Example 7, the polyester staple fiber of Comparative Example 4 was replaced with polyamide staple fiber, and the physical properties of the woven fabric after spinning and fabric processing were evaluated in the same manner as in Example 4. The results are shown in Tables 4 and 5.

[0064]

[Table 4]

[0065]

[Table 5]

As is clear from Tables 4 and 5, compared to Comparative Example 2 of a woven fabric composed of yarns of polyester short fibers only,
Surprisingly, a woven fabric composed of a yarn containing at most 5 to 20% of para-aramid short fibers, Examples 4, 5, and 6 have cut resistance.
The flat wear strength is improved by 15% or more, and the friction heat melting property and the cigarette heat melting property are greatly improved. In particular, it has a feature that the dyeability is improved to the same level. Woven fabric composed of spun yarn containing 30% para-aramid short fibers (Comparative Examples 3 and 6)
Is 1 polyester short fiber and 1 polyamide short fiber
As compared with the woven fabric made of the spun yarn of 00% by weight (Comparative Examples 2 and 5), the dyeability is excellent at the same level as is apparent also in the L value, but the cut wound resistance is reduced and the tear strength is significantly reduced. Therefore, it was not practical. Example 10 The para-aramid fiber staple obtained in Example 2 was used in ASTRAZON GREEN OY GL.
Para-aramid fiber staple 10% dyed green by the above-mentioned dyeing method using 200 (manufactured by Bayer)
And a 90% blended yarn of 40 s / 1 was obtained. The density 1
Woven in a plain weave with 30 strands / in and a weft density of 85 strands / in,
A green heather-like fabric was obtained on a white background. The light fastness of this fabric was grade 4 and was excellent for clothing. [Comparative Example 8] Polyamide blended fabric obtained by blending 10% of the produced para-aramid fiber and commercially available polyamide staple using conventional non-dyed para-aramid fiber staples instead of the dyed para-aramid fiber of Example 10. I got Although it became a yellow heather-like fabric on a white background, the dyeing light fastness was class 1 and there was a problem in light fastness for clothing.

[0067]

As described above, the spun yarn in which 3 to 20% by weight of the dyed para-aramid staple fiber of the present invention is blended with the polyester staple fiber, and the woven or knitted fabric using the spun yarn have excellent dyeability and light resistance. The heat melting resistance of tobacco and friction heat melting can be greatly improved. In addition, a spun yarn obtained by blending 3 to 20% by weight of para-aramid short fibers and polyamide short fibers and a woven or knitted fabric using the same have improved dyeing properties and significantly improved wear resistance. In addition, clothing materials that can be provided for applications requiring functional properties such as outdoor sports with excellent strength properties, cut resistance, heat resistance, abrasion resistance, and excellent dyeability and light resistance based on para-aramid fiber Obtainable.

 ──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor, Takeshi Hatano 3-4-1-18 Nakanoshima, Kita-ku, Osaka-shi Toray Dupont Co., Ltd. Osaka Head Office (72) Inventor, Kanekoko Fukuyama 1-1-1, Oe, Otsu, Shiga Prefecture No. Toray Co., Ltd. Seta factory F term (reference) 4L036 MA04 MA05 MA06 MA35 MA39 PA01 PA31 RA24 UA08 UA16 4L048 AA25 AA42 AA48 AA49 AA53 AB05 AC00 AC07 AC14 AC17 BA01 BA02 CA00 CA01 CA06 CA09 CA15 DA01 DA03

Claims (7)

[Claims] 1. A spun yarn containing dyed rose-based aramid staple fibers and synthetic fiber staple fibers, wherein the ratio of dyed rose-based aramid staple fibers to the spun yarn is 3 to 20% by weight. And spun yarn. 2. The spun yarn according to claim 1, wherein the rose-based aramid short fiber is a polyparaphenylene terephthalamide short fiber. 3. A spun yarn containing dyed para-aramid short fibers and synthetic short fibers, wherein the para-aramid fibers before dyeing have a tensile strength of 15 / d or more and a crystal size (110 direction) of 30. ~ 55 angstroms,
The spun yarn according to claim 1, comprising a dyeable para-aramid staple fiber formed while always maintaining the water content before dyeing at 8% or more. 4. The fiber according to claim 1, wherein the synthetic short fiber is polyester or polyamide, and the proportion of the short polyester fiber or polyamide short fiber in the spun yarn is 7 to 85% by weight. The spun yarn described in 1. 5. A spinning dope is produced from polyparaphenylene terephthalamide (PPTA) having a dyed para-aramid staple fiber having an intrinsic viscosity (ηinh) of 5 or more and concentrated sulfuric acid. Through which the filaments are once spun into the air, immediately led into water and solidified to form filaments of high strength and high elastic modulus, crimping the filaments to cut and staple them, and dyeing the staples In a separate step without continuity, the tensile strength of the para-aramid short fibers before dyeing is 15 / d or more, the crystal size (110 direction) is 30 to 55 angstroms, The spun yarn according to any one of claims 1 to 4, wherein the spun yarn is formed while always maintaining the water content at 8% or more. 6. The spun yarn according to claim 1, wherein the single fiber fineness of the dyed para-aramid short fibers and synthetic short fibers is 2.5 denier or less. 7. A fabric comprising the spun yarn according to any one of claims 1 to 6.