JP2000192375A - Dyeing of polytrimethylene terephthalate fiber - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a method for dyeing a polytrimethylene terephthalate fiber excellent in color fastness. SOLUTION: This method for dyeing a polytrimethylene terephthalate fiber in an aqueous stain solution containing disperse dye comprises: dyeing the fiber at 90 to 140 deg.C for 15 to 90 minutes; setting it at >=55 deg.C and <= the boiling point of the stain solution without or with cooling the stain solution; and removing the waste water and washing the fiber.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a method for dyeing polytrimethylene terephthalate fiber. More specifically, the present invention provides a dyeing method capable of dyeing in a shorter time and obtaining excellent dyeing fastness.

[0002]

2. Description of the Related Art Japanese Patent Publication No. 9-509225 discloses a method of dyeing polyethylene terephthalate fiber in an aqueous dyeing solution containing a disperse dye at normal pressure. The publication states that the temperature of the liquor is brought to a temperature which is at most 20 ° C. below the boiling point of the liquor or of the liquor and the dyeing is allowed to proceed for at least 20 minutes at the dyeing temperature or boiling point, preferably for 30 to 90 minutes. Subsequently at a temperature of 20-50 ° C., preferably 1 ° C. per minute
A dyeing method of cooling at a cooling rate of 1 to 3 is disclosed. However, the polytrimethylene terephthalate fiber obtained by this dyeing method has fastness to dyeing, especially fastness to sublimation,
There is a problem that the fastness of sublimation during storage is inferior. In addition, this dyeing method has a low cooling rate of the dyeing solution after dyeing,
There is a problem that the time required for dyeing becomes long because the temperature is cooled to -50 ° C.

[0003]

SUMMARY OF THE INVENTION An object of the present invention is to provide a polymethylene terephthalate fiber having excellent color fastness. It is another object of the present invention to provide a cost-effective dyeing method in which the time required for dyeing is short.

[0004]

As a result of various studies on the above-mentioned problems, the present inventors have found that the dyeing liquor after dyeing is cooled or cooled to a temperature of 55 ° C. or higher and lower than the boiling point of the dyeing liquor. It has been found that the above-mentioned object can be attained by draining the solution at the above temperature and then washing the dyed fiber, thereby completing the present invention. That is, the present invention provides a method for dyeing a polytrimethylene terephthalate fiber in an aqueous dyeing solution containing a disperse dye at a temperature of 90 to 140 ° C.
Dyeing for 90 minutes, and then cooling or cooling the dyeing liquor to a temperature of from 55 ° C. to the boiling point of the dyeing liquor, and then draining, and then washing the fiber. This is a method for dyeing polytrimethylene terephthalate fiber.

Hereinafter, the present invention will be described in detail. The polytrimethylene terephthalate fiber used in the present invention refers to a polyester fiber having a trimethylene terephthalate unit as a main repeating unit, and the trimethylene terephthalate unit is about 50 mol% or more, preferably 70 mol% or more.
More than 80 mol%, more preferably 90 mol%
The above is mentioned. Therefore, the total amount of the other acid component and / or glycol component as the third component is about 50 mol% or less, preferably 30 mol% or less, more preferably 20 mol% or less, and still more preferably 10 mol% or less. Polytrimethylene terephthalate.

[0006] Polytrimethylene terephthalate is produced by condensing terephthalic acid or a functional derivative thereof with trimethylene glycol or a functional derivative thereof in the presence of a catalyst under appropriate reaction conditions. In this production process, an appropriate one or two or more third components may be added to form a copolymerized polyester, or
Polyesters other than polytrimethylene terephthalate such as polyethylene terephthalate, nylon, and polytrimethylene terephthalate may be separately produced and then blended or composite-spun (sheath core, side-by-side, etc.).

The third components to be added include aliphatic dicarboxylic acids (oxalic acid, adipic acid, etc.), alicyclic dicarboxylic acids (cyclohexane dicarboxylic acid, etc.), and aromatic dicarboxylic acids (isophthalic acid, sodium sulfoisophthalic acid, etc.). ), Aliphatic glycols (ethylene glycol, 1,2
-Propylene glycol, tetramethylene glycol, etc.), alicyclic glycols (cyclohexanediol, etc.), aromatic dioxy compounds (hydroquinone bisphenol A, etc.), aliphatic glycols containing aromatics (1, 4
-Bis (β-hydroxyethoxy) benzene, etc.), polyether glycols (polyethylene glycol, polypropylene glycol, etc.), aliphatic oxycarboxylic acids (ω
-Oxycaproic acid), aromatic oxycarboxylic acids (P
-Oxybenzoic acid, etc.). Also one or three
Compounds having more than one ester-forming functional group (such as benzoic acid or glycerin) can also be used as long as the polymer is substantially linear.

Further, matting agents such as titanium dioxide, stabilizers such as phosphoric acid, ultraviolet absorbers such as hydroxybenzophenone derivatives, crystallization nucleating agents such as talc, lubricating agents such as aerosil, and antioxidants such as hindered phenol derivatives. An oxidizing agent, a flame retardant, an antistatic agent, a pigment, a fluorescent whitening agent, an infrared absorbing agent, an antifoaming agent and the like may be contained. The shape of the fiber cross section may be polygonal, such as round, triangular, L-shaped, T-shaped, Y-shaped, W-shaped, eight-leaf, flat, dogbone, etc., multi-leaf, hollow or irregular. Good.

[0009] Further, the form of the yarn may be a spun yarn such as a ring spun yarn or an open-end spun yarn, a multifilament raw yarn (including an ultrafine yarn) having a single yarn denier of about 0.1 to 5 denier, a sweet twisted yarn or the like. Strong twisted yarn, mixed yarn, false twisted yarn (PO
Y (including a drawn false twisted yarn), a fluid jet processed yarn, and the like.
Incidentally, the content is usually 30% by weight within a range not to impair the object of the present invention.
Other fibers such as wool are blended (silospan or silofil etc.), entangled mixed fibers (different shrinkage mixed fibers with high shrinkage yarns, etc.), intertwisted, composite false twist ( It may be mixed by means such as two-feed fluid jetting.

In the present invention, a mixed product in which polytrimethylene terephthalate fibers and other fibers are mixed may be used. The mixed product refers to a mixture of yarn and / or knitted fabric or the like in which both are mixed, and for example, cross-knitted using elastic fibers such as polyurethane as so-called bare yarn, nylon fibers, polyethylene terephthalate, and the like. Synthetic fibers such as fibers, acrylic fibers, and polypropylene fibers; semi-synthetic fibers such as copper ammonia rayon, viscose rayon, purified cellulose fiber, and acetate fiber;
Combined with long or short fibers such as natural fibers such as cotton, wool and silk (composite forms such as covering, core spun yarn, interlaced entangled yarn, air covering yarn, intertwisted form) It may be knitted or cross-knitted with such composite yarn and polytrimethylene terephthalate fiber. The present invention exerts a remarkable effect in a mixed product with an elastic fiber such as polyurethane or a cellulosic fiber such as rayon. The disperse dye referred to in the invention is not particularly limited, but it is preferable to use an alkali-soluble disperse dye because the effect of improving the color fastness is enhanced.

The alkali-soluble disperse dye means that the ratio of the dyeing rate when the pH is 11 to the dyeing rate when the pH is 11 is 60% or less when the polyethylene terephthalate fiber fabric is dyed at 130 ° C. , and the and is that the disperse dyes containing acetamide group (-NHCOCH ₃₎ or a cyano group (-CN), for example, C. I. Disperse Yellow 5, C.I. I. Day sparse yellow 6
4, C.I. I. Disperse Yellow 192, C.I. I. Disperse Yellow 186, C.I. I. Disperse Yellow 76, C.I. I. Day Sparse Yellow 42, C.I.
I. Day Sparse Yellow 163, C.I. I. Disperse Yellow 79, C.I. I. Disperse Orange 29,
C. I. Disperse Orange 30, C.I. I. Disperse Orange 73, C.I. I. Disperse Orange 5
5, C.I. I. Disperse Orange 61, C.I. I. Disperse thread 43, C.I. I. Disperse thread 19
1, C.I. I. Disperse Red 288, C.I. I. Disperse Red 192,

C. I. Dice Bar Red 135, C.I.
I. Disperse thread 92, C.I. I. Disperse thread 221, C.I. I. Disperse thread 154, C.I.
I. Disperse thread 323, C.I. I. Disperse thread 91, C.I. I. Disperse Red 258, C.I.
I. Disperse thread 73, C.I. I. Disperse thread 54, C.I. I. Disperse thread 126, C.I.
I. Disperse thread 72, C.I. I. Disperse thread 127, C.I. I. Disperse thread 205, C.I.
I. Disperse thread 111, C.I. I. Disperse thread 76, C.I. I. Disperse violet 28
C. I. Disperse Blue 54, C.I. I. Disperse Blue 60, C.I. I. Disperse Blue 87: 1,
C. I. Disperse Blue 198, C.I. I. Disperse Blue 266, C.I. I. Disperse Blue 26
8, C.I. I. Day sparse blue 301,

C. I. Day Sparse Blue 142, C.I.
I. Day Sparse Blue 146, C.I. I. Day Sparse Blue 270, C.I. I. Day Sparse Blue 128,
C. l. Day Sparse Blue 148, C.I. I. Disperse Blue 211, C.I. I. Disperse Blue 10
6, C.I. I. Dispersible-1167, C.I. l. Day Sparse Blue 205, C.I. I. Disperse Blue 9
4, C.I. I. Disperse Blue 207, C.I. I. Day Sparse Blue 186, Sumicaron Yellow S-RP
D, Dyanix Yellow UN-SE, Dianix Orange UN-SE, Sumicaron Red S
E-RPD, Sumikaron Red S-RPD, Dianix Carmine UN-SE, Dianix Scarlett 3R-SE, Tianix Rubin UN
-SE, Dianix Rubin NB-SE, Sumicaron Blue SE-RPD, Sumicaron Blue S
-RPD,

Dynamix Blue UN-SE, Dyanix Blue KRN-FS, Dyanix
Dark Blue B-SE, Kayaron Polyester Blue S-SF, Sumikaron Navy Blue SE-R
PD, Sumicaron Navy Blue S-RL, Dianix Navy Blue BG-SE, Dianix Navy Blue UN-SE, Dianix Navy Blue K-SF, Dianix Navy Blue TK-SF, Sumicaron Black S-3B
L, Sumikaron Black S-BGL, Sumikaron
Black S-BB, Sumicaron Black S-2B
F, Sumikaron Black S-BL, Dyanix Black RN-SE, Dyanix Black B
N-SE, Dyanix Black HG-FS, Kayaron Polyester Black S, Kayaron Polyester Black BR-SF, Kayaron Polyester
Black G-SF and the like.

After scouring the polytrimethylene terephthalate fiber used in the present invention or a cloth made of the fiber,
It is preferred to dye. Further, if necessary, setting or alkali reduction treatment may be performed before dyeing. Dyeing is performed at a temperature of from 1 to 5 ° C./min from room temperature to 90 to 140 ° C., which is a dyeing temperature, particularly from 2 to 3 ° C.
It is preferred that the temperature be raised at a rate of / minute. Dyeing temperature is 90-140
° C, preferably 95-130 ° C. Dyeing temperature is 90
When the temperature is lower than ℃, sufficient coloring properties cannot be obtained and a dark color cannot be obtained. On the other hand, when the temperature exceeds 140 ° C., the decomposition of the dye or the like is increased, and the color developability is reduced, so that a sufficient dark color cannot be obtained, and the fiber strength further decreases. The dyeing time to be kept constant at this dyeing temperature is 15 to 90.
Minutes, preferably 20 to 60 minutes. If the time is less than 15 minutes, sufficient color developability cannot be obtained, while if it exceeds 90 minutes, the color developability hardly improves.

Next, the dyeing liquor is discharged without cooling or by cooling to a temperature from 55 ° C. or higher to a temperature lower than the boiling point of the dyeing liquor. The temperature is preferably from 60 ° C or higher to the boiling point of the dyeing solution or lower, particularly preferably 70 to 98 ° C. If the waste liquid is used at a temperature lower than 55 ° C., the color fastness decreases. On the other hand, performing waste liquid at a temperature exceeding the boiling point is disadvantageous in terms of dyeing equipment. The cooling rate when cooling is not particularly limited, but may be 2 to 10
C / min, particularly preferably 3 to 8C / min.

In the case of normal pressure dyeing such as pantyhose, L
If the coloring property is insufficient with a dark color such as black having a value of about 10 to 20 or an extremely dark color, a carrier may be used in combination. As the carrier, for example, ordinary carriers such as phenylphenol-based (ortho, para, meso) and methylnaphthalene-based carriers may be used, but N-alkylphthalimide (the alkyl portion has 9 to 12 carbon atoms), butylbenzoate And dimethyl terephthalate are particularly preferred. After draining the dyeing solution, the dyed polytrimethylene terephthalate fiber is subsequently washed. Washing includes a method of washing with a general soaping agent for polyester, reduction washing, and the like, but reduction washing is preferable because the color fastness is improved.

As the reducing agent, sodium hydrosulfite and thiourea dioxide are preferable. As the alkaline agent to be used, an alkali metal hydroxide such as sodium hydroxide, an alkaline earth metal hydroxide such as calcium hydroxide, phosphoric acid Alkali metal phosphates such as disodium hydrogen and alkali metal carbonates such as sodium carbonate can be preferably used. Each use concentration may be the concentration under the reduction washing conditions usually performed with polyethylene terephthalate fiber. The reduction washing is preferably performed at 60 to 90 ° C. for 10 to 30 minutes. After reduction washing, neutralize with acetic acid and wash with water.

The dyeing operation according to the dyeing method of the present invention can be carried out by any of a batch method and a continuous method using a device such as Wins, Jigger, beam dyeing machine, liquid jet dyeing machine and the like. In the dyeing operation according to the dyeing method of the present invention, as for the dyeing conditions other than those described above, any dyeing conditions that are generally used for polyethylene terephthalate fibers can be applied, and the type and concentration of the dyeing auxiliary,
The dyeing pH, dyeing bath ratio, dye concentration, and the like may be appropriately set in consideration of the type of the article to be dyed, the processing apparatus used, and the dyeing method. Hereinafter, the present invention will be described with reference to examples.

[0020]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be specifically described below with reference to examples, but the present invention is not limited to these examples. The evaluation items in the examples will be described below. (1) Sublimation fastness Evaluated according to JIS-L-0879A and B methods. A sample having no fading and having a good quality was classified as a class 5, and was sequentially determined as a class 1 (poor). (2) Sublimation fastness during storage Evaluated according to JIS-L-0854. No fading,
Good grades were assigned a fifth grade, and were sequentially determined to be a first grade (poor). (3) Coloring property It was determined visually.

<Method for Producing Polytrimethylene Terephthalate Fiber> Polytrimethylene terephthalate having ηsp / c = 0.8 is spun at a spinning temperature of 265 ° C. and a spinning speed of 1200 m / min to obtain an undrawn yarn. 60
C., a hot plate temperature of 140.degree. C., a draw ratio of 3, and a drawing speed of 800 m / min. To give a drawn yarn of 50d / 36f. The strength, elongation, elastic modulus, and elastic recovery at 10% elongation of the drawn yarn are 3.2 g / d, 46%, and 30 g, respectively.
/ D and 98%.

The elastic recovery at 10% elongation was as follows: the sample was subjected to an initial load of 0.01 g / d and stretched at a constant rate of 20% elongation per minute to reach an elongation of 10%. By the way, on the contrary, it contracts at the same speed, and draws a stress-strain curve.
When the residual elongation when the stress was reduced to 0.01 g / d, which is equal to the initial load, during the shrinkage was L, the residual elongation was calculated by the following equation. Elastic recovery rate at 10% elongation = [(10−L) / 10] ×
100 (%)

[0023]

Examples 1 to 3 and Comparative Example 1 A single-knit knitted fabric of polytrimethylene terephthalate fiber 50d / 36f obtained by the above-mentioned production method was used at 70 ° C. using a score roll FC-250 (trade name, manufactured by Kao Corporation). Scour for 20 minutes, then 18
Presetting was performed at 0 ° C. for 30 seconds. This knitted fabric was dyed under the following dyeing solution conditions. Staining conditions are from 40 ° C to 2 ° C /
The dyeing solution was heated to 110 ° C. at a heating rate of 1 minute and kept at 110 ° C. for 30 minutes.
After cooling at / min, the liquid was drained.

<Dyeing Solution Conditions> Dye; I. Disperse Blue 167 6% owf leveling agent; 0.5 g / l (Nikka Chemical Co., Ltd .: Nikka San Salt RM-340) Acetic acid; 0.5 cc / l sodium acetate sodium acetate; 1 g / l bath ratio 1:20

Next, water is added to the dyeing machine and the temperature is set to 80 ° C.
The temperature was raised to, and the following chemicals were added thereto to adjust the concentration to the following. Hydrosulfite sodium; 2 g / liter caustic soda; 2 g / liter nonionic detergent; 0.5 g / liter (trade name: Sunmol RC-700, manufactured by Nikka Chemical Co., Ltd.) Bath ratio: 1:30 Then, the dyed product is subjected to reduction washing at 80 ° C. for 10 minutes, the remaining liquid is discharged, the dyed product is sufficiently rinsed with warm water and water, dehydrated, dried at 120 ° C. for 2 minutes, and dried at 170 ° C. And a final set of 40 seconds.
Table 1 shows the results.

[0026]

Example 4 The same polytrimethylene terephthalate fiber as in Examples 1 to 3 but with 50d / 36f and polyurethane fiber 20
Denier and 51% set rate (Asahi Kasei Corporation:
Pantyhose was prepared by covering, knitting, presetting, sewing, scouring, dyeing, reducing and washing under the following conditions under the following conditions. Refining was performed in the same manner as in Examples 1 to 3. The dyeing was performed at 98 ° C. for 30 minutes under the following dyeing solution conditions, and the dyeing solution was immediately drained without cooling. Next, reduction washing and water washing were performed in the same manner as in Examples 1 to 3, and setting was performed under the following conditions. The obtained pantyhose had good comfort, high shape memory and excellent fastness. The results of color fastness of this product are shown in Table 1.

<Covering conditions> Elastic fiber draft 3.4 times Number of twists of winding yarn 500 turns / meter m <Knitting conditions> Number of needles 400 Kamakei Diameter 4 inches Diameter of leg section knitting course 2000 courses <Preset conditions> > Vacuum setter 50 ° C., 10 minutes <Dyeing solution conditions> Dye; I. Disperse Yellow 64 0.2% owf C.I. I. Disperse Red 258 0.7% owf C.I. I. Disperse Blue 301 0.4% owf Other auxiliaries are the same as in Examples 1 to 3. <Set conditions> Set temperature 120 ° C Steam set time 30 seconds

[0028]

Comparative Example 2 In Example 4, after dyeing at 98 ° C. for 30 minutes, the dyeing solution was cooled at a cooling rate of 1 ° C./min for 30 minutes.
Dyeing and finishing were performed in the same manner as in Example 4 except that the solution was discharged after cooling to ℃. The same evaluation was performed on the obtained dyed product, and the results are shown in Table 1.

[0029]

[Table 1]

[0030]

According to the present invention, polytrimethylene terephthalate fibers having excellent color fastness can be provided in a short time required for dyeing and can be advantageously provided in terms of cost.

Claims (1)

[Claims] 1. A method for dyeing a polytrimethylene terephthalate fiber in an aqueous dyeing solution containing a disperse dye, comprising the steps of:
Dyeing at a temperature of 0 to 140 ° C. for 15 to 90 minutes, and then cooling the dyeing solution without cooling or at 55 ° C.
From the above, a method for dyeing polytrimethylene terephthalate fiber, comprising: draining the liquid at a temperature equal to or lower than the boiling point of the dyeing liquid, followed by washing the fiber.