JP2012041664A - Method for dyeing dyeable polypropylene fiber - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a method for dyeing a dyeable polypropylene fiber that can suppress lowering of fiber strength and that can dye a fiber product blended with a polyester fiber with a color similar to that of the polyester fiber.SOLUTION: In the method for dyeing a dyeable polypropylene fiber, a ratio of air:water in a dyeing tank during dyeing is adjusted so that the proportion of water is larger than 3 (air):1 (water) in terms of volume ratio. The dye used for dyeing includes a non-quinone-based disperse dye and a disperse dye having molecular weight of 400 or more and a similar color disperse dye having molecular weight of less than 400, or a disperse dye having hydrophilic group and a similar color disperse dye having no hydrophilic group.

Description

The present invention relates to a dyeing method for dyeable polypropylene fibers.

  Polypropylene fiber has excellent performances such as a specific gravity as small as 0.92 and light, a low thermal conductivity and warmness, a low moisture content, and no wetting.

  However, they have the disadvantages that they are difficult to dye and cannot be dyed after being made into yarn or woven fabric, and the melting point is as low as 160 ° C., so that the yarn dissolves or deteriorates during dyeing finish processing.

  Therefore, various techniques for modifying yarns to improve dyeability are known. For example, blended polyester component (Patent Document 1), blended isophthalic acid modified polybutylene terephthalate (Patent Document 2), blended vinyl monomer (Patent Document 3), blended ethylene vinyl acetate. There are many known ones (Patent Document 4), those containing a dyeing accelerator (Patent Document 5), and those containing a metal salt of stearic acid (Ni, Zn, Al, etc.).

JP 2006-2275 A JP2004-305086 JP 2001-262433 A JP2000-8223 JP2008-533315

  However, although these dyestuffs have improved dyeability, there has been a problem that the strength of the yarn is reduced by the dyeing treatment, and the strength is insufficient when used for clothes and the like.

  In addition, when dyed with regular polyester fibers that have been blended, blended, woven, knitted, knitted, etc., to compensate for the lack of strength, dyeable polypropylene fibers are almost dyed with a specific color. However, the regular polyester fiber and the dyeable polypropylene fiber have a problem that the hue is completely different.

  Therefore, the present invention solves the above problems, suppresses a decrease in yarn strength in dyeing dyeable polypropylene fibers, and can be dyed in a hue similar to that of polyester fibers in a fiber product combined with polyester fibers. A dyeing method is provided.

In order to solve the above problems, the present invention has the following configuration.
(1) A method for dyeing dyeable polypropylene fibers, wherein the ratio of air: water in the dyeing tank at the time of dyeing is larger than 3 (air): 1 (water) in volume ratio.
According to this dyeing method, a decrease in yarn strength during dyeing can be suppressed.

(2) The dye at the time of dyeing is a non-quinone-based disperse dye and includes a disperse dye having a molecular weight of 400 or more and a disperse dye of the same color of less than 400, or a disperse dye having a hydrophilic group and a hydrophilic group The method for dyeing dyeable polypropylene fibers according to the above (1), comprising a disperse dye of the same color that does not contain a dye.
According to this dyeing method, a similar hue can be dyed even when combined with regular polyester fibers while suppressing a decrease in yarn strength during dyeing.

  The dyeable polypropylene fiber according to the present invention (hereinafter referred to as dyeable PP) suppresses a decrease in yarn strength during dyeing, and can be suitably used for textile products such as clothes.

Hereinafter, the dyeing method of the dyeable PP according to the embodiment of the present invention will be described.

(First embodiment)
In the dyeing method for dyeable polypropylene of the present invention, the ratio of air: water in the dyeing tank at the time of dyeing is larger than 3 (air): 1 (water) in volume ratio.

  The dyeable polypropylene fiber is a polypropylene fiber that can be dyed with a disperse dye, and contains a polyester component as described above, a blend of isophthalic acid-modified polybutylene terephthalate, and a vinyl monomer. Although what was used, what mix | blended ethylene vinyl acetate (patent document 4), what mix | blended the dyeing promoter, etc. are known, it is not limited to these.

  Further, the shape of the dyeable PP at the time of dyeing may be any form of fiber product such as monofilament, multifilament, span, woven fabric, knitted fabric, non-woven fabric, cotton, and clothing.

  PP fibers are compounded with other fibers such as polyester by blending, blending, union, knitting, etc., and are made into fiber products in the form of multifilament, span, woven fabric, knitted fabric, non-woven fabric, cotton, clothing, etc. May be.

  As a dyeing method, dyeing is performed under the condition that the ratio of air: water in the dyeing tank at the time of dyeing is larger than 3 (air): 1 (water). When the ratio of air is larger than the ratio of water at a volume ratio of 3 (air): 1 (water) at the time of dyeing, the strength of the dyeable PP is lowered by the dyeing treatment. The ratio of air: water in the dyeing tank at the time of dyeing is preferably 1 (air): 1 (water), more preferably 1 (air): 2 (water) by volume.

More preferably, the air in the dyed layer is replaced with nitrogen or water vapor.
As a specific dyeing method, a dyeing method by a bath exhaust method in which dyeing is performed while immersing PP fibers in a dyeing bath in which a dye is dispersed in water is preferable.

The dyeing machine used is a cheese type dyeing machine, beam type dyeing machine or drum type dyeing machine that can always immerse the entire dyeable PP in a dyeing bath (sometimes called dyeing solution) during dyeing, Even if PP fibers come out from the dyeing bath into the air during dyeing, the dyeing tank can be sealed to prevent contact with new air, or the inside of the dyeing tank can be replaced with nitrogen or water vapor. A high-pressure liquid flow dyeing machine or the like can be used, but is not limited thereto.

  As the dyeing temperature at the time of dyeing, it is preferable that the temperature is raised from room temperature of about 5 to 30 ° C and dyed at 100 to 135 ° C. If the dyeing temperature is below 100 ° C, the dyeable PP may not be sufficiently dyed. Moreover, when it exceeds 135 degreeC, dyeable PP deteriorates, there exists a possibility that the intensity | strength of a fiber may fall or various dyeing fastness may fall. The dyeing time is preferably about 1 to 90 minutes after reaching the maximum temperature.

  The bath ratio (mass ratio) between the dyeing bath and the dyeable PP at the time of dyeing is preferably dyeable PP: dyeing solution = 1: 1 to 1: 100. If there is more dyeable PP than 1: 1 in the bath ratio, dyeing unevenness may occur. If there is more dyeing liquid in the bath ratio of 1: 100, it takes energy and time to increase the temperature of the dyeing liquid, and costs are high. More disadvantageous.

  A disperse dye can be used as the dye used for dyeing. In addition, in the case of using a dyeable PP modified by adding a sulfone group or the like to a cationic dye dyeable, a dyeable PP having a cationic dye or an amino group added thereto and modified to be an acid dye dyeable was used. In some cases, an acid dye may be used.

When dyeing with a cationic dye or an acid dye, low temperature dyeing of less than 100 ° C. is possible, so there is little decrease in yarn strength of dyeable PP during dyeing, but in the present invention, dyeing is performed at 100 ° C. or more. At the time of dyeing with disperse dyes, fiber products in which dyeable PP and regular polyester fibers (polyester fibers that are not cationically dyed or normal pressure dyeable) are combined at a high temperature of 100 ° C or higher Even when it is dyed, it is effective in suppressing strength reduction and maintaining dyeing fastness.

  During dyeing, acid or pH adjusters such as acetic acid, leveling agents, slow dyeing agents, carriers, UV absorbers, SR agents, antibacterial agents, deodorants, hydrophilizing agents, antistatic agents are used in the dyeing bath. Etc. may be added.

  After dyeing, soaping may be performed as necessary. The soaping may be performed according to the dyeing density and the required dyeing fastness, such as washing with water, washing with hot water, and reduction washing. Further, a surfactant, an alkali, or the like may be used in combination with water and hot water as necessary.

In the case where the shape of the dyeable PP is a fabric such as a woven fabric or a knitted fabric, the dyeable dyeable PP is preferably subjected to a finishing set for removing wrinkles and adjusting the density. The finishing set condition may be about 30 seconds to 10 minutes at 120 to 150 ° C.
Further, if necessary, it may be applied to the dyeable PP after dyeing an ultraviolet absorber, SR agent, antibacterial agent, deodorant, hydrophilizing agent, antistatic agent, softener, water repellent and the like. .

  The dyeable dyeable PP obtained as described above has little decrease in strength even after dyeing, and a dyeable PP having good dyeing fastness can be obtained.

(Second Embodiment)
The second embodiment of the present invention will be described below.
The dye at the time of dyeing of a composite product of dyeable polypropylene fiber and regular polyester fiber (hereinafter also referred to as dyeable PP / regular PET composite product) is a non-quinone disperse dye and has a molecular weight of 400 or more. The first embodiment is characterized in that the disperse dye contains a disperse dye having a similar color of less than 400, or a disperse dye having a hydrophilic group and a disperse dye of the same color not having a hydrophilic group. Dyeing method for dyeable polypropylene fibers.

  When dyeing a dyeable PP / regular PET composite with a disperse dye, when dyeing with a single dye, such as a single red dye, the density of the two may differ slightly, but the hue surface Then, since the dyeable PP fiber and the regular polyester fiber are almost the same, the commercial value is not greatly reduced.

However, for example, when dyeing with a plurality of dyes, for example, blue and yellow dyes, the regular polyester fiber is dyed green, and the dyeable PP is hardly dyed with yellow dye. The phenomenon of being dyed appears.

Although there is a commercial value when a reversible application or a gradation fiber product is desired, color matching is difficult, and there is a possibility that the commercial value of the general fiber product may be lowered.

  Therefore, in the second embodiment, it is possible to dye the regular polyester fiber and the dyeable PP in a similar hue while suppressing a decrease in yarn strength due to dyeing.

As the dyeable PP of the present invention, those described in the first embodiment can be used.
Further, the regular polyester fiber also means a polyester fiber that is not modified to be cation dyeable or normal pressure dyeable as described in the first embodiment, and examples thereof include polyethylene terephthalate and polytrimethylene terephthalate. .

  Further, the dyeable PP / regular PET composite article refers to a fiber product in the form of multifilament, span, woven fabric, knitted fabric, non-woven fabric, cotton, clothes, etc. using a composite of dyeable PP and regular polyester fiber.

  As the disperse dye used in the present invention, non-quinone dyes can be used, and azo, quinoline, nitro, coumarin, methine and aminoketone disperse dyes can be used. In particular, azo dyes are preferably used from the viewpoints of fastness and color variation.

  In the present invention, among the above non-quinone disperse dyes, a disperse dye having a molecular weight of 400 or more and a disperse dye having a similar color of less than 400 may be included. At least one kind of disperse dye having a molecular weight of 400 or more and a disperse dye having a similar color of less than 400 must be included, but two or more kinds may be included.

  Non-quinone disperse dyes having a molecular weight of less than 400 include Disperse Yellow 42 (molecular weight 369), Disperse Yellow 60 (molecular weight 326), Disperse Yellow 104 (molecular weight 366), Disperse Blue 165: 1 (molecular weight 389), Disperse 369 Molecular weight 322), Disperse Red 73 (molecular weight 342), Disperse Red 17 (molecular weight 256), and the like.

  Examples of non-quinone disperse dyes having a molecular weight of 400 or more include Disperse Yellow 160 (molecular weight 418), Disperse Yellow 163 (molecular weight 416), Disperse Red 323 (molecular weight 454), Disperse Red 343 (molecular weight 438, 410), Disperse (Molecular weight 432), Disperse Blue 149 (molecular weight 443), Disperse Blue 266 (molecular weight 481), Disperse Orange 61 (molecular weight 481), Disperse Orange 73 (molecular weight 443), and the like.

  The same color system is "COLOUR INDEX" issued by THE SOCIETY OF DYERS AND COLORISTS, "Dyeing Note" issued by Color Dyeing Co., Ltd. and the product name of dyes sold by dye manufacturers, Judgment may be made with reference to blue, yellow and the like.

  Further, at the time of dyeing, among the non-quinone dyes, it is preferable to include a disperse dye having a hydrophilic group and a disperse dye of the same color not having a hydrophilic group. The disperse dye having a hydrophilic group and the disperse dye of the same color not having one need to be included at least one kind, but may be included two or more kinds.

  Examples of the hydrophilic group include a hydroxyl group, a carboxyl group, an amide group, a sulfo group, and an amino group.

  Specific examples of the non-quinone disperse dye having a hydrophilic group include Disperse Yellow 3 (hydroxyl group), Disperse Yellow 104 (hydroxyl group), Disperse Yellow 160 (hydroxyl group), Disperse Orange 5 (hydroxyl group), Disperse Blue266 (amide group). , Disperse Blue 165: 1 (amide group), Disperse Red 13 (hydroxyl group), Disperse Red 17 (hydroxyl group), Disperse Yellow 56 (hydroxyl group), Disperse Yellow 60 (hydroxyl group), Disperse Blue 106 (hydroxyl group), Disperse Y (disperse Y) Amino group), Disperse Orange 29 (hydroxyl group), and the like.

  Examples of non-quinone disperse dyes having no hydrophilic group include Disperse Yellow 163, Disperse Yellow 86, Disperse Orange 61, Disperse Orange 73, Disperse Red 18, Disperse Red 65, Disperse Red 65, Disperse Red 65, Disperse Red 65, Disperse Red 65, Disperse Red 65 Is mentioned.

  Further, it may include a disperse dye having a molecular weight of 400 or more and a disperse dye having a similar color of less than 400, and further may include a disperse dye having a similar color and a disperse dye having a hydrophilic group.

By blending and using disperse dyes of similar colors with different molecular weights, or disperse dyes of similar colors with and without hydrophilic groups, multiple similar colors (red for red, blue for blue, and yellow for yellow) Yellow) is dispersed and dyed in a material which is easily dyed, and the dye of a specific color is prevented from being concentrated and dyed on either dyeable PP or regular polyester fiber.

  Therefore, it can suppress that the hue of dyeable PP and regular polyester fiber shifts | deviates greatly, suppresses the difference in the hue of the front and back of a fiber product, and a feeling of dullness, and can provide the fiber product excellent in the same color property.

  Further, the temperature at the time of dyeing, the bath ratio (mass ratio of the dough and the dyeing liquid), the volume ratio of air and water in the dyeing tank, soaping, dyeing machine, finishing and the like are the same as in the first embodiment.

EXAMPLES Hereinafter, an Example is given and this invention is demonstrated further in detail. In addition, this invention is not limited to a following example.
The physical properties and fastness in the examples were measured by the following methods.

(Strength)
The strength of the dyeable PP was measured by evaluating the burst strength of the test cloth. The burst strength was measured according to JIS L1096 burst strength (Method A, Murren method).
(Light fastness)
Measurement was performed according to JIS L0842 (third exposure method). The irradiated surface was irradiated with the front surface (mainly regular polyester fiber) and the back surface (mainly dyeable PP), respectively.

(Washing fastness)
The measurement was performed according to JIS L0844 (A-2 method). In addition, cotton and nylon were used for the attached cloth. Contamination was judged using the most contaminated attached cloth.
(Friction fastness)
In accordance with JIS L0849, measurement was performed using a friction tester type 2 (Gakushoku type).
(Dry cleaning fastness)
Measurement was performed according to JIS L0860. The attached fabric used was a multi-fiber knit fabric (Kyogi No. 1). The determination of contamination was made with the most contaminated one.

Example 1
Two-layer knitted fabric (mesh, regular polyester fiber on the surface, regular polyester fiber on the surface, acceptable on the back side) using 84 dtex 24 filament 53.8% by mass as dyeable PP and 84 dtex 72 filament 46.2% by mass as regular polyester fiber The dyed PP was placed and scoured and pre-set (Dyeable PP / Regular PET Composite).
Next, dyeing was performed under the following conditions.

Yellow dye 0.4% omf
Formulated dye Disperse Yellow 42, molecular weight 369, no hydrophilic group.
Disperse Yellow 163, molecular weight 416, no hydrophilic group.

Blue dye 1.0% omf
Compounding dye Disperse Blue 149, molecular weight 443, hydrophilic group (hydroxyl group).
Disperse Blue 125, molecular weight 409 and 588, no hydrophilic group.

Air: water ratio (volume ratio) = 1: 4
Bath ratio PP fiber: Dyeing liquid (mass ratio) = 1: 20
Dyeing temperature × time 120 ° C. × 30 minutes acid acetic acid 0.25 g / l,
Dispersant Nikka Sun Salt 7000 (manufactured by Nikka Chemical) 0.25 g / l
Dyeing machine Drum type dyeing machine (Dye Actor, Onorimori Co., Ltd.)

  After dyeing under the above conditions, reduction washing with hydrosulfite 1 g / l and soda ash 1 g / l was performed at 90 ° C. for 10 minutes.

Next, a finishing set was performed at 130 ° C. for 3 minutes.
In the obtained dyeable PP / regular PET composite product, the back side on which the dyeable PP was disposed was slightly light in color, but both sides were uniformly dyed green. The density of the dyeable PP / regular PET composite after finishing set was 53 courses / 2.54 cm and 48 wells / 2.54 cm. The basis weight was 172 g / m ² .
The burst strength was 978 kPa, and the strength reduction was suppressed as compared with Comparative Example 1. The rupture strength without the dyeing treatment was 1010 kPa.

Further, the dyeing fastness was also good as described below.
Light fastness 4 or higher on the front surface, 3 or higher on the back surface Friction fastness Dry 4 or higher / humidity 4 or higher Wash fastness Discoloration 4-5, contamination (nylon) 4-5, liquid contamination 4th class dry cleaning fastness Degree fading 4-5 grade, contamination (nylon) 4-5 grade, liquid contamination grade 4

(Comparative Example 1)
Dyeing treatment and finishing treatment were performed in the same manner as in Example 1 except that the air: water ratio (volume ratio) in the dyeing tank was 3: 1 and the air ratio was increased.
The dyeable state of the obtained dyeable PP / regular PET product was as good as in Example 1, but the burst strength was 863 KPa, which was lower than that in Example 1.

(Comparative Example 2)
The dyeing process and the finishing process were performed in the same manner as in Example 1 except that the used dye was changed as follows (not including a plurality of dyes of similar colors).
Since the obtained dyeable PP / regular PET composite contains only one kind of yellow dye and one blue dye, the surface on which the regular polyester fiber is arranged is dyed green. However, the back surface on which the dyeable PP on the back surface was disposed was dyed blue.

Yellow dye 0.4% omf
Disperse Yellow 160, molecular weight 418, hydrophilic group present (hydroxyl group).

Blue dye 1.0% omf
Disperse Blue 266, molecular weight 481, hydrophilic group present (amide group).

(Example 2)
A double-layered knitted fabric (canoko, regular polyester fiber on the front surface, acceptable on the back surface, using 84 decitex 24 filament 57.7% by weight as dyeable PP and 84 decitex 72 filaments 42.3% by weight as regular polyester fiber. The dyed PP was placed and scoured and pre-set (Dyeable PP / Regular PET Composite).
Next, dyeing was performed under the following conditions.

Yellow dye 0.48% omf
Formulated dye Disperse Yellow 42, molecular weight 369, no hydrophilic group.
Disperse Yellow 163, molecular weight 416, no hydrophilic group.

Red dye 0.24% omf
Formulated dye Disperse Red 343, molecular weight 438 and 410 hydrophilic group None.
Disperse Red (Chemical Exam No. 5-5930), molecular weight 436, no hydrophilic group.
Disperse Red (Chemical Exam No. 5-5931), molecular weight 436, no hydrophilic group.
Disperse Red 111, molecular weight 432, no hydrophilic group.
Disperse Red 111 with “—C ₂ H ₄ OCOCH ₃ ” changed to “—C ₂ H ₄ OH”, molecular weight 391, hydrophilic group (hydroxyl group).

Blue dye 1.2% omf
Compounding dye Disperse Blue 149, molecular weight 443, hydrophilic group (hydroxyl group).
Disperse Blue 125, molecular weight 409 and 588, no hydrophilic group.

Air: water ratio (volume ratio) = 1: 3
Bath ratio PP fiber: Dyeing liquid (mass ratio) = 1: 20
Dyeing temperature × time 120 ° C. × 30 minutes acid acetic acid 0.25 g / l,
Dispersant Nikka Sun Salt 7000 (manufactured by Nikka Chemical) 0.25 g / l
Dyeing machine Drum type dyeing machine (Dye Actor, Onorimori Co., Ltd.)

  After dyeing under the above conditions, reduction washing with hydrosulfite 1 g / l and soda ash 1 g / l was performed at 90 ° C. for 10 minutes.

Next, a finishing set was performed at 130 ° C. for 3 minutes.
In the obtained dyeable PP / regular PET composite product, the back surface on which the dyeable PP was arranged was slightly light in color, but both sides were uniformly dyed beige. The density after the finishing set was 43 courses / 2.54 cm and 47 wells / 2.54 cm. The basis weight was 159 g / m ² .
The burst strength was 623 kPa, and the strength reduction was suppressed as compared with Comparative Example 2. The rupture strength without the dyeing treatment was 650 kPa.

Further, the dyeing fastness was also good as described below.
Light fastness 4 or higher on the front surface, 3 or higher on the back surface Friction fastness Dry 4 or higher / humidity 4 or higher Wash fastness Discoloration 4-5, contamination (nylon) 4-5, liquid contamination 4th class dry cleaning fastness Degree fading 4-5 grade, contamination (nylon) 4-5 grade, liquid contamination grade 3

(Comparative Example 3)
Dyeing treatment and finishing treatment were performed in the same manner as in Example 2 except that the air: water ratio (volume ratio) in the dyeing tank was 3: 1 and the air ratio was increased.
The dyeable state of the obtained dyeable PP / regular PET composite product was as good as in Example 2, but the burst strength was 560 KPa, which was lower than that in Example 2.

  What dye | stained dyeable PP with the method which concerns on this invention has little intensity | strength fall. In addition, since the hue difference between dyeable PP and regular polyester fiber is small, it is possible to prevent the hues from changing between the front and back, and tones, and undergarments and other sports clothes. It can be used widely for various purposes such as bags, shoes.

Claims (2)

A dyeing method for dyeable polypropylene fibers, wherein the ratio of air: water in the dyeing tank at the time of dyeing is larger than 3 (air): 1 (water) in volume ratio. The dye at the time of dyeing the composite product of the dyeable polypropylene fiber and the regular polyester fiber is a non-quinone disperse dye and contains a disperse dye having a molecular weight of 400 or more and a disperse dye of the same color of less than 400, or 2. The method for dyeing a dyeable polypropylene fiber according to claim 1, further comprising a disperse dye having a similar color and a disperse dye having a hydrophilic group.