KR100572257B1 - Dyeing method of polyester fibers using alkali-clearable phthalimide-based azo disperse dyes - Google Patents

Abstract

The present invention relates to an alkali-cleaning azo-based disperse dye having a phthalimide structure on the diazo component in terms of chemical structure and having a detergency under mild alkali conditions after dyeing of a polyester fiber material.

The azo alkali washable disperse dye of the present invention is characterized by being an azo benzene monoazo compound having the following structural formula (I).

(I)

(I)

Wherein X is hydrogen, methyl or ethyl group, Y ¹ and Y ² are hydrogen, methyl, methoxy or acetylamino group, and R ¹ and R ² are each unsubstituted or substituted alkyl group.

The use of the disperse dyes of the present invention can replace the reduction cleaning process with an alkaline cleaning process, which not only alleviates the high pH and BOD problems in the dyeing wastewater caused by the use of the reducing cleaning liquid, but also with polyester / cotton blend fibers. Even in the dyeing of materials, an efficient and economical one-bath dyeing method is possible.

Disperse Dyes, Phthalimides, Dyeing, Sun Bathing, Azo

Description

DYEING METHOD OF POLYESTER FIBERS USING ALKALI-CLEARABLE PHTHALIMIDE-BASED AZO DISPERSE DYES}

1A is a dyeing diagram for dyeing a polyester component in a two bath dyeing method of a conventional polyester / cotton blend fiber material.

1B is a dyeing diagram for dyeing cotton components in a two bath dyeing method of a conventional polyester / cotton blend fiber material.

Figure 2 is a dyeing diagram showing a one-bath dyeing method of the polyester / cotton blend fiber material using a dispersion dye having a phthalimide structure of the present invention.

The present invention relates to an azo alkali cleansing disperse dye having a phthalimide structure. More specifically, the chemical structure has a phthalimide structure on the diazo component, so that it can be washed under weak alkaline conditions after dyeing of the polyester fiber material. It is not only an alternative to the existing non-environmentally friendly reduction and washing process, but also an alkaline cleansing azo disperse dye that enables one-bath dyeing of polyester / cotton blend fiber materials.

Conventional azo disperse dyes have been widely used to dye fiber materials, in particular fiber materials such as polyester fibers. However, these known dyes required a reduction and washing process using a strong alkali and a strong reducing agent after dyeing in order to obtain high fastness in terms of fastness of a product dyed by dyeing methods such as vacuum dyeing.

In general, various types of disperse dyes are known which are useful for dyeing polyester fiber materials. For example, Japanese Patent Application Nos. 41-5468 and 55-152873 disclose violet and blue disperse dyes represented by the following formulas.

The Color Index provided by the Society of Dyers and Colourists (SDC) and the American Association of Textile Chemists and Colorists (AATCC) includes the red-based disperse dye, CIDisperse Red 7 (Constitution No. 11150) , CI Disperse Red 13 (Constitution No. 11115), C.I. Disperse Red 17 (Constitution No. 11210) is published.

In addition, when using a conventional dispersion dye in dyeing polyester / cotton blend fiber material, a two-bath dyeing process is used to obtain high fastness. In other words, in the first salt bath, the polyester material is dyed at 130 ° C. using a disperse dye, and after being washed with reduction, the second dye bath is used to dye the cotton material at around 80 ° C. using a reactive dye.

In general, in order to obtain excellent fastness when dyeing polyester fiber material with a disperse dye, it is subjected to reduction clearing (Reduction clearing) process as a post-dyeing treatment. In general, a reduction washing process is performed at about 80 ° C by administering hydrosulfite (Na ₂ S ₂ O ₄ ), which is a strong reducing agent, and sodium hydroxide (NaOH), which is a strong alkali, to assist in the stability of the reducing agent. Will be processed for about 20 minutes. In this way, as shown in the reaction scheme below, in the case of the azo dispersion dye, the reducing agent destroys the azo bonds in the molecular structure to discolor and at the same time loses the affinity for the polyester fiber, thereby removing the unfixed dyes on the fiber surface. Later fastness can be improved. Therefore, in the case of the existing azo-based dyes, the reduction and washing process after dyeing is essential for excellent fastness.

Such a conventional dispersion dye has a problem that the BOD and pH in the dyeing wastewater is inevitably raised by using a strong reducing agent and strong alkali during the post-reduction washing after dyeing. In addition, when the azo groups in the disperse dye structure are decomposed during the reduction and washing, the reduced dye remains in the fiber or dye wastewater to produce an aromatic amine compound, and due to the strong oxidizing property of the amine compound, It was a cause for deterioration.

On the other hand, the AT Leaver group of the aromatic amine compound (a) originating from the diazo compound among the aromatic amines generated during the reduction cleaning, the basicity of the aromatic amine is weakened by the action of the electron withdrawing group Although environmental toxicity or human toxicity is insignificant, the aromatic amine compound (b) generated from the coupling component has a chemical structure very similar to that of benzidine or phenylenediamine. Eggplants have been reported to be carcinogenic (Text. Chem. Color., Vol. 24, p18, 1992).

On the other hand, even in the dyeing of polyester / cotton blend fiber materials, when using the conventional disperse dyes, a two-bath dyeing method must be used for high fastness, this dyeing method not only consumes a lot of energy required for dyeing water and heating Due to the large amount of preparation and long dyeing process, it was inefficient.

Accordingly, the present inventors have extensively studied disperse dyes to improve the drawbacks of the known dyes described above and satisfy the requirements for dyes, and have therefore developed a special azo-based disperse dyes having alkali cleaning properties of the present invention.

It is an object of the present invention to have a cleanability under weak alkali conditions after dyeing polyester fiber material, which can replace the existing reduction and washing process, and also allows one bath dyeing method for polyester / cotton blend fiber material. It is to provide an azo-based disperse dye having an imide structure.

Another object of the present invention is to provide a method for producing an alkali cleansing azo-based disperse dye having a new phthalimide structure.

It is still another object of the present invention to provide a dyeing method of polyester fiber material, which can omit the reduction cleaning by the strong alkaline solution with the new alkaline washable azo-based dispersion dye.

Still another object of the present invention is to provide a dyeing method of a polyester / cotton blend fiber material capable of omitting reduction washing with a strong alkaline solution by using a new alkaline cleansing azo-based dispersion dye and capable of one bath dyeing.

The azo alkali cleansing disperse dye having a phthalimide structure according to the present invention is characterized by being an azo benzene monoazo compound having the following structural formula (I).

(I)

(I)

Wherein X is hydrogen, methyl or ethyl group, Y ¹ and Y ² are hydrogen, methyl, methoxy or acetylamino group, and R ¹ and R ² are each unsubstituted or substituted alkyl group.

The method for producing an alkaline-cleaning disperse dye according to the present invention is a coupling reaction between a diazonium salt of an aromatic amine compound represented by the following structural formula (II) and an aromatic aniline compound which is a coupling component represented by the following structural formula (III). It is characterized by obtaining the compound of formula (I) through.

(II)

(II)

(III)

(III)

Wherein X, Y ¹ , Y ² , R ¹ and R ² are the same as in formula (I).

Having phthalimide structure of this invention The dyeing method of the polyester fiber material using an azo alkali washable disperse dye is a weak alkali in the polyester high temperature and high pressure dyeing, using the dye of the above breakfast (I), omitting the reduction washing process with a strong alkali and a reducing agent. It is characterized by performing alkali washing with a solution.

The alkali used in the alkaline solution may include weak alkalis such as sodium carbonate (Na ₂ CO ₃ ) and sodium hydrogen carbonate (NaHCO ₃ ), and sodium carbonate is preferable in consideration of the pH range required for alkali cleaning. It is also possible to use a small amount of sodium hydroxide, which is a strong alkali, instead of weak alkali.

In addition, the one-bath dyeing method of the polyester / cotton blend fiber material using the azo alkali-cleaning disperse dye having a phthalimide structure of the present invention is a dye and a reactive dye of the formula (I), a dispersant, a forget-me-not and acetic acid After adding to water to make a salt bath, according to the conventional polyester high-temperature high-pressure dyeing method, the temperature is raised to 120 to 140 ℃ dyeing the polyester portion while maintaining for 20 to 60 minutes, the temperature is lowered to 70 to 90 ℃ The dyeing of the cotton portion according to the conventional dyeing method using a reactive dye, but the weak alkali carbonate is administered by maintaining the temperature for 20 to 60 minutes characterized in that the dyeing and alkali cleaning (alkali clearing) at the same time.

Alkali employed in the alkaline solution may be a small amount of sodium carbonate (Na ₂ CO ₃ ), weak alkali of sodium hydrogen carbonate (NaHCO ₃ ), or sodium hydroxide, which is a strong alkali, but the pH range required for dyeing cotton fibers and alkali cleaning, It is preferable to use sodium carbonate, which is a weak alkali, in consideration of the disproportionation of cotton fibers due to rapid dye absorption.

The present invention will be described in more detail below.

The azo alkali cleansing disperse dye having a phthalimide structure according to the present invention is an azo benzene monoazo compound having the following structural formula.

(I)

(I)

Wherein X is hydrogen, methyl or ethyl group, Y ¹ and Y ² are hydrogen, methyl, methoxy or acetylamino group, and R ¹ and R ² are each unsubstituted or substituted alkyl group.

The present invention provides a method of obtaining high fastness by a weak alkali treatment after dyeing a polyester fiber material using the monoazo compound represented by the formula (I).

The disperse dye of the present invention is an azo-based disperse dye having a phthalimide structure in the chemical structure, so that the phthalimide ring is hydrolyzed and ring-opened under relatively weak alkali conditions to give water solubility to the dye as it is a diester group. As a result, since the dye is not fixed to the fiber after dyeing is dissolved in water by alkali washing, the dye is eliminated from the fiber and the dyeing fastness of the product can be increased.

The compound of formula (I) may be obtained through a coupling reaction between a diazonium salt of an aromatic amine compound represented by the following formula (II) and an aromatic aniline compound which is a coupling component represented by the following formula (III). .

(II)

(II)

(III)

(III)

Wherein X, Y ¹ , Y ² , R ¹ and R ² are the same as in formula (I).

Diazonium salts of the aromatic compounds are applied directly to sulfonated amines that are well dissolved in strong basic amines and acidic solutions: NaNO ₂ , HCl, 0-5 ° C. or nitrosulfic acid method (applied to weakly basic amines: NaNO ₂ , H ₂ SO ₄ , 0-5 ° C.) and the like to obtain a compound of the formula (I) through a coupling reaction at 0-5 ° C. with a coupling component.

The dyeing method of the polyester fiber material of the present invention is the same condition as the normal polyester high temperature and high pressure dyeing, but using the dye of the formula (I), instead of omitting the reducing cleaning process by strong alkali and reducing agent, weak alkali It is a feature to perform alkali washing with a solution.

Polyester fiber materials can be dyed only by hydrophobic disperse dyes that do not have dyeing seats that can react with common dyes due to the physical and chemical properties of the raw materials and are generally hydrophobic and have no hydrophilic groups.

The dyeing of the polyester fiber material may be made by an appropriate method, and may be dyed by conventional methods, for example, high temperature high pressure dyeing, thermosol dyeing or carrier dyeing, depending on the physical and chemical properties of the material. At present, high temperature and high pressure dyeing is most commonly used.

High temperature and high pressure dyeing is generally performed under high temperature and high pressure of 130 ° C or higher, and is dyed under weakly acidic condition of pH 4-5 using a dispersant to help disperse the dye in water.

In the reduction and washing process, which is used as a post-treatment of conventional polyester fiber materials, it is generally treated with sodium hydroxide about 2.0 g / l and hydrosulfite about 2.0 g / l and then treated at 80 ° C. for about 20 minutes. However, the sodium hydroxide used at this time is a strong alkali to increase the pH and BOD in the dyeing wastewater, hydrosulfite as a strong reducing agent has a problem of destroying azo groups in the dye molecule structure to produce carcinogenic amines. The present invention solves this problem by employing a special monoazo dye to replace the existing non-environmentally friendly reducing cleaning process with a weak alkali.

The dye of the present invention does not need to use a strong reducing agent that is harmful to the environment in which it is commonly used, and by using weak alkali instead, it is possible to obtain excellent fastness through sufficient cleaning property.

The alkaline cleaning may be performed for 10 to 20 minutes at a temperature of 70 to 90 ° C., and the cleaning temperature and time may be understood to be similar to reduction clearing conditions in a conventional dyeing process.

The weak alkali that can be used for the alkali cleaning is not particularly limited as long as it can give a value of about pH 11-12, and examples of the weak alkali include sodium carbonate (Na ₂ CO ₃ ) and sodium hydrogen carbonate (NaHCO ₃ ). Can be mentioned. However, considering the efficiency of alkali cleaning, the use of sodium carbonate is particularly recommended, and the use of sodium hydroxide is recommended if a small amount of strong alkali is used instead to reduce the process cost.

The dyeing method of the polyester / cotton blend fiber material of the present invention is prepared by adding a dye and a reactive dye of the formula (I), a dispersant, a forget-me-not and acetic acid to water to make a salt bath, and then in accordance with a conventional polyester high-temperature high-pressure dyeing method. Dyeing the polyester portion while maintaining the temperature at 120 to 140 ° C. for 20 to 60 minutes, lowering the temperature to 70 to 90 ° C., and then dyeing the cotton part according to a conventional dyeing method using a reactive dye. Sodium carbonate is administered to maintain the temperature for 20 to 60 minutes, and dyeing and alkali clearing are performed at the same time.

2 is a process diagram for the one-bath dyeing method of the present invention, showing a specific dyeing example.

The dyeing of polyester / cotton blend fiber material conventionally performed is by a two-bath dyeing method as shown in Figs. 1A and 1B, and in the first salt bath, a polyester material is generally used at 130 ° C. using a disperse dye. After dyeing the dye and undergoing reduction washing to obtain excellent fastness, in the second salt bath, cotton material is dyed at around 80 ℃ using reactive dye. At this time, adding alkaline sodium carbonate to fix the reactive dye on cotton fiber It is common.

The reason why two baths were dyed when dyeing conventional polyester / cotton blend fabrics was that when the reducing washing solution was used in the same bath with the reactive dyes, the reactive dyes were decomposed by the reducing agent and the dyeing of the cotton fibers was inhibited. This is because staining results cannot be obtained.

However, in the case of using the alkali-cleaning disperse dye of the present invention, the addition of alkalis to the washing of the unfixed dyes on the surface of the fiber and the reactive dyes can be fixed to the cotton fibers at the same time. Instead of inefficient two-bath dyeing, an efficient and economical one-bath dyeing is possible.

In the present invention, conditions such as temperature and time for polyester dyeing, temperature and time for cotton dyeing are not the only features of the present invention, but are the same as those of ordinary cotton dyeing by ordinary high-temperature high-pressure dyeing and reactive dyes. It may be understood, and other process conditions not specifically mentioned may be the same. Therefore, the reason for the upper and lower limits for the temperature and time conditions need not be specified.

In the dyeing of the blended fiber material of the present invention, the forget-me-not, dispersant, acetic acid to be used is usually used when dyeing polyester or cotton, it can be easily understood by those skilled in the art that the dosage can be adjusted according to the purpose and type of dyeing. Could be.

The dyeings dyed with the dyes of the present invention are excellent in light fastness, sweat fastness, washing fastness and friction fastness by weak alkali cleaning after dyeing under the above conditions, and the dyes of the present invention have extremely excellent build-up properties. It has good leveling, leveling and washing resistance, and has a high rate of dust absorption.

Hereinafter, specific examples and comparative examples of the present invention will be described, but the following examples are only for illustrative purposes and should not be understood as limiting the scope of the present invention.

EXAMPLE

Examples 1 to 3 (dye synthesis)

In a 1 liter three-neck flask, 280 ml of concentrated sulfuric acid (95%, sp. Gr. 1.84) and 48 ml of fuming nitric acid (fuming, 90%, sp. Gr. 1.50) were mixed, and the mixture was heated to 10-15 ° C. using an ice bath. While maintaining, 40 g (0.272 mol) of phthalimide was added slowly and stirred vigorously for 16 hours at room temperature. After completion of the reaction, 100 g of ice was crushed finely in a 2 L beaker and the mixture was stirred vigorously while slowly adding the nitration solution, but the temperature of the solution did not exceed 20 ° C. The nitride thus obtained was filtered under reduced pressure, washed with 500 ml of ice water prepared in a 1 l beaker, washed with water and filtered four times in the same manner, recrystallized with ethanol (95%), and filtered. 4-nitrophthalimide was obtained.

20 g of 4-nitrophthalimide synthesized in this way was completely dissolved in 84 g of distilled water and 450 ml of hydrochloric acid (35%, sp. Gr. 1.14) in 84 g of tin chloride (II), followed by cooling to 20 ° C. After addition to the precipitate, hydrochloride crystals of the amino acid were precipitated with stirring for 90 minutes. The hydrochloride crystals of the amino acid thus obtained were collected at 0 ° C., washed with hot water and hydrolyzed to obtain 4-aminophthalimide represented by the following formula, which was recrystallized with glacial acetic acid and dried.

The diazonium compound produced by diazotizing the 4-aminophthalimide thus synthesized by the conventional method was replaced with N, N-diethylaniline, N, N-diethyl-meth-toluidine and N- (3-di Coupling with ethylamino-4-methoxy-phenyl) -acetamide, respectively, afforded a monoazo compound, dye 1, dye 2 and dye 3 represented by the following formula.

Examples 4-6 (Dye Synthesis)

The diazonium compound produced by diazolating the 4-aminophthalimide synthesized in Examples 1 to 3 by the conventional method was prepared using N, N-dimethylaniline, N-ethyl-N-methylaniline, and N, N- Coupling with diethanol aniline respectively yielded a monoazo compound, dye 4, dye 5 and dye 6 represented by the following formula.

Examples 7 to 9 (Dye Synthesis)

In a 1 liter three-neck flask, 280 ml of concentrated sulfuric acid (95%, sp. Gr. 1.84) and 48 ml of fuming nitric acid (fuming, 90%, sp. Gr. 1.50) were mixed, and the mixture was heated to 10-15 ° C. using an ice bath. While maintaining, 43.8 g (0.272 mol) of N-methylphthalimide was slowly added and stirred vigorously for 16 hours at room temperature. After completion of the reaction, 100 g of ice was crushed finely in a 2 L beaker and the mixture was stirred vigorously while slowly adding the nitration solution, but the temperature of the solution did not exceed 20 ° C. The nitride thus obtained was filtered under reduced pressure, washed with 500 ml of ice water prepared in a 1 l beaker, washed with water and filtered four times in the same manner, recrystallized with ethanol (95%), and filtered. 4-nitro-N-methylphthalimide was obtained.

21.5 g of 4-nitro-N-methylphthalimide thus synthesized was completely dissolved in 84 g of tin chloride (II) in a mixed solution of 150 ml of distilled water and 450 ml of hydrochloric acid (35%, sp. After addition to the solution cooled by, the hydrochloride crystals of the amino acid were precipitated with stirring for 90 minutes. The hydrochloride crystals of the amino acid thus obtained were collected at 0 ° C., washed with hot water and hydrolyzed to obtain 4-amino-N-methylphthalimide represented by the following formula, which was recrystallized with glacial acetic acid and dried.

The diazonium compound produced by diazotizing the 4-amino-N-methylphthalimide thus synthesized by the conventional method was treated with N, N-diethylaniline, N, N-diethyl-meth-toluidine and N- ( Coupling with 3-diethylamino-4-methoxy-phenyl) -acetamide, respectively, afforded monoazo compound, dye 7, dye 8 and dye 9 represented by the following formula.

Examples 10 to 12 (Dye Synthesis)

The diazonium compound obtained by diazotizing the 4-amino-N-methylphthalimide synthesized in Examples 7 to 9 according to the conventional method was prepared using N, N-dimethylaniline, N-ethyl-N-methylaniline, and N. Coupling with, N-diethanolaniline, respectively gave a monoazo compound, a dye 10, a dye 11 and a dye 12 represented by the following formula.

Examples 13-15 (Dye Synthesis)

In a 1 liter three-neck flask, 280 ml of concentrated sulfuric acid (95%, sp. Gr. 1.84) and 48 ml of fuming nitric acid (fuming, 90%, sp. Gr. 1.50) were mixed, and the mixture was heated to 10-15 ° C. using an ice bath. While maintaining, 47.6 g (0.272 mol) of N-ethylphthalimide was slowly added and stirred vigorously for 16 hours at room temperature. After completion of the reaction, 100 g of ice was crushed into a 2 L beaker and the mixture was stirred vigorously while slowly adding the nitration solution, but the temperature of the solution did not exceed 20 ° C. The nitride obtained in this way was filtered under reduced pressure, washed with 500 ml of ice water prepared in a 1 L beaker, washed with water and filtered four times in the same manner, recrystallized with ethanol (95%) and filtered to obtain the following formula: 4-nitro-N-ethylphthalimide was obtained.

22.9 g of 4-nitro-N-ethylphthalimide thus synthesized was completely dissolved in 84 g of tin chloride (II) in a mixture of 150 ml of distilled water and 450 ml of hydrochloric acid (35%, sp. Gr. 1.14), and then 20 After addition to the solution cooled to ° C, hydrochloride crystals of the amino acid were precipitated with stirring for 90 minutes. The hydrochloride crystals of the amino acid thus obtained were collected at 0 ° C., washed with hot water and hydrolyzed to obtain 4-amino-N-ethylphthalimide represented by the following formula, which was recrystallized with glacial acetic acid and dried.

The diazonium compound produced by diazotizing the 4-amino-N-methylphthalimide thus synthesized by the conventional method was treated with N, N-diethylaniline, N, N-diethyl-meth-toluidine and N- ( Coupling with 3-diethylamino-4-methoxy-phenyl) -acetamide, respectively, afforded a monoazo compound, dye 13 dye 14 and dye 15 represented by the following formula.

Examples 16-18 (Dye Synthesis)

The diazonium compound obtained by diazotizing the 4-amino-N-ethylphthalimide synthesized in Examples 13 to 15 by the conventional method was prepared by N, N-dimethylaniline, N-ethyl-N-methylaniline, and N. Coupling with, N-diethanolaniline, respectively gave a monoazo compound, a dye 16, a dye 17 and a dye 18 represented by the following formula.

Examples 19 to 36 (dying of polyester fiber materials)

  Each monoazo compound dye obtained in Examples 1 to 18 was dispersed in 60 ml of water to which 0.5 g / l of a dispersant (surfactant for dye dispersion) was added at 1% owf, and a polyester fiber material was added thereto. The pH of the salt bath was adjusted to 4.0 ~ 4.5 using acetic acid.

The dye bath was heated up to 130 ° C. and maintained for 60 minutes to perform dyeing. After dyeing, the dyeings were added to 60 ml of an alkali washing bath containing 20 g / l of sodium carbonate and 1.0 g / l of a surfactant for soaping, and then treated at 80 ° C. for 20 minutes and dried by cold water.

  In this manner, as in the conventional dyeing after reduction and dyeing, dyeings having excellent fastnesses such as water fastness, sweat fastness, daylight fastness, friction fastness and sublimation fastness were obtained. In addition, the dyes of the present invention exhibited excellent build-up, leveling and washing resistance, and a high rate of absorption. (Laundry Fastness KS K 0430; Grade 4 / 5-5, Sunlight Fastness KS K 0700; 4-5 Grade, iron fastness KS K 0637; grades 4 to 4/5, frictional fastness KS K 0650; grades 4/5 to 5).

Examples 37 to 54 (One Bath Dyeing of Polyester / Cotton Blend Fiber Materials)

0.5 g / l of a dispersant (surfactant for dispersing dyes) and each of the monoazo compound dyes obtained in Examples 1 to 18 and a general commercially available reactive dye having a high temperature stability (monochlorotriazine type) as 1% owf, respectively (Na ₂ SO ₄ ) Disperse and dissolve in 60 ml of water to which 80 g / l is added, and add polyester / cotton blend fiber material. The pH of the salt bath was adjusted to 4.5 ~ 5.0 using acetic acid.

  The dye bath was heated up to 130 ° C. and held for 30 minutes to dye the polyester component, cooled to 80 ° C. at a rate of 2 ° C./min, and then cooled 20 g / l of alkali (sodium carbonate) twice after cooling and 10 minutes after cooling. Cotton dyeing with a reactive dye was carried out by dividing into a portion. After the addition of alkali, the fiber was further maintained at 80 ° C. for 30 minutes for the homogenization of the fiber material, and the dyeing was finished. After dyeing, the dye was washed with water at 70 ° C. for 10 minutes, at 95 ° C. for 20 minutes (1.0 g / l of softener), at 70 ° C. for 10 minutes, and then treated at 80 ° C. for 20 minutes, and then dried by cold water. 2)

  In this way, a dyeing product having excellent fastnesses such as flush fastness, sweat fastness, daylight fastness, friction fastness and sublimation fastness can be obtained like the dyeing dyeing by the two-bath dyeing method, which is a conventional dyeing method of polyester / cotton blend fiber material. Could. (Laundry Fastness KS K 0430; Grade 4 / 5-5, Friction Fastness KS K 0650; Grade 4 / 5-5).

 When the disperse dye having a phthalimide structure of the present invention is used for dyeing a polyester fiber material, it is possible to replace the existing reduction washing process with an alkaline washing process to obtain high fastness after dyeing. This will not only alleviate the high pH and BOD problems in the dyeing wastewater caused by the use of reducing cleaning fluids, but also prevent the development of carcinogenic aromatic amines in an environmentally friendly way. The processing method becomes possible.

 In addition, an efficient and economical one-bath dyeing method is also possible in dyeing polyester / cotton blend fiber materials. This reduces the amount of dyeing water (50-55%) and the amount of preparation used, compared to the existing two-bath dyeing process, energy savings and dyeing process time (40-50%) can be expected.

Although the present invention has been described in detail only with respect to the described embodiments, it will be apparent to those skilled in the art that various modifications and variations are possible within the technical scope of the present invention, and such modifications and modifications belong to the appended claims. will be.

Claims (6)

delete delete In the dyeing method of the polyester fiber material using a high temperature and high pressure dyeing method, using an alkali cleaning disperse dye having a phthalimide structure, which is an azo benzene-based monoazo compound represented by the following formula (1), reduction by strong alkali and reducing agent A method of dyeing a polyester fiber material, characterized in that to perform an alkaline cleaning process with a weak alkaline solution having a pH of 11 to 12 instead of the cleaning process. Formula 1

(Wherein X is hydrogen, a methyl or ethyl group, Y ¹ and Y ² is hydrogen, methyl, methoxy or acetylamino group, R ¹ and R ² is a substituted C with an alkyl group or a hydroxy C ₁ to C _{4 1} to It is either one selected from the alkyl group of C ₄ , each may or may not be the same.) delete 4. The method for dyeing the polyester fiber material according to claim 3, wherein the weak alkali is sodium carbonate or sodium hydrogen carbonate. An alkaline cleansing disperse dye having a phthalimide structure, which is an azo benzene-based monoazo compound represented by Formula 1, a reactive dye, a dispersant, a forget-me-not and acetic acid was added to water to prepare a salt bath, and heated to 120 to 140 ° C. Dyeing the polyester portion by the dyeing method of claim 3 while maintaining for 20 to 60 minutes; And After the temperature is lowered to 70 to 90 ℃ and dyeing the cotton portion according to the method of cotton dyeing by reactive dyes, while maintaining the temperature for 20 to 60 minutes by administering weak alkali sodium carbonate at the same time the pH of 11 to 12 Alkaline cleaning using an alkaline solution; dyeing method of the polyester / cotton blend fiber material, characterized in that carried out by a one-bath dyeing method. Formula 1

(Wherein X, Y ¹ , Y ² , R ¹ and R ² are as defined above).

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