JPH09170180A - Dyeing of polyester-based fabric by natural dye - Google Patents

Abstract

PROBLEM TO BE SOLVED: To dye a polyester-based fabric in a natural color tone without causing strength deterioration of fabric, by pretreating the polyester-based fabric with an aqueous solution of a prescribed metal salt compound and dyeing the fabric with a natural dye. SOLUTION: A fiber fabric of a polyester copolymerized with an alkali metal salt of 5-sulfoisophthalic acid is treated with a mordant in an aqueous solution of a basic aluminum acetate shown by the formula, Al2 O(CH3 CO2 )4 or Al2 (OH)(CH3 CO2 )2 and/or a sulfate shown by the formula, MAl(SO4 )2 (M is an alkali metal or ammonium) such as potassium alum, sodium alum or ammonium alum of 0.1-10 equivalents, preferably 0.8-5 equivalents of the 5- sulfoisophthalate at 100 deg.C for 60 minutes and washed with water. Then the fabric is dyed with a natural dye such as madder or gardenia crest at 60-100 deg.C.

Description

Detailed Description of the Invention

[0001]

TECHNICAL FIELD The present invention relates to a method for dyeing a polyester fiber using a natural dye, and more specifically, the polyester fiber is treated with an aqueous solution of a specific metal salt compound and then dyed with a natural dye. Thus, the present invention relates to a method for dyeing a polyester fiber capable of expressing a natural color tone.

[0002]

2. Description of the Related Art In recent years, in the textile field, dyeing with natural dyes such as plant dyeing has been attracting attention as the trend toward nature-oriented and ecology-oriented has been increasing. Generally, plant dyeing is used for natural fibers such as silk, cotton and wool, and synthetic fibers such as polyester have few functional groups that bind to dyes and are hydrophobic. I couldn't dye it.

In order to solve this problem, a method is proposed in which a cationic dyeable polyester fiber copolymerized with 5-sulfoisophthalate is treated with an aqueous solution of iron, copper or aluminum salt and then dyed with a vegetable dye. (Japanese Patent Laid-Open No. 3-40881).

However, in the above method, drainage of iron and copper is regulated by the Water Pollution Control Act and the Act on the Control of Poisonous Substances, and there is a problem in terms of handleability and safety. The exemplified aluminum sulfate and aluminum acetate (normal salt) had a problem that the strength of the cloth was significantly deteriorated.

[0005]

The object of the present invention is to use a natural dye which can express the natural color tone of a natural dye, and which is excellent in safety and does not cause deterioration in strength by solving the above problems. It is intended to provide a method for dyeing a polyester fiber.

[0006]

As a result of various attempts to solve the above problems, the present inventors have found that the above problems can be solved by using a specific aluminum compound.

That is, according to the present invention, 5-sulfoisophthalate copolyester fiber is treated with an aqueous solution of basic aluminum acetate and / or an aqueous solution of sulfate represented by the following general formula (1). Then, there is provided a method for dyeing a polyester fiber, which comprises dyeing with a natural dye.

[0008]

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[0009]

BEST MODE FOR CARRYING OUT THE INVENTION The polyester constituting the polyester fiber used in the present invention is a polyester mainly composed of terephthalic acid and an alkylene glycol having 2 to 6 carbon atoms and copolymerized with 5-sulfoisophthalic acid salt. is there. Furthermore, within the range that does not impair the object of the present invention,
Other dicarboxylic acids or diols may be copolymerized at less than 20 mol% each. Particularly preferred is polyethylene terephthalate copolymerized with 5-sulfoisophthalate.

Examples of 5-sulfoisophthalic acid salts in the present invention include 5-sulfoisophthalic acid alkali metal salts and 5-sulfoisophthalic acid quaternary phosphonium salts. The type of the alkali metal ion and the phosphonium ion is not particularly limited, but examples of the alkali metal include sodium, potassium, lithium and the like, and examples of the phosphonium include tetramethylphosphonium, tetraethylphosphonium, tetraalkylphosphonium such as tetrabutylphosphonium. , And tetraarylphosphonium such as tetraphenylphosphonium.

Among them, the alkali metal 5-sulfoisophthalic acid salt has a remarkable effect of preventing strength deterioration during mordant described below, and is particularly preferably used in the present invention.

The ratio of copolymerization of 5-sulfoisophthalic acid salt in the above polyester is preferably in the range of 0.1 to 20 mol%, more preferably 0.4 to 10 mol based on alkylene terephthalate which is a main constituent. %
Range.

If this ratio is less than 0.1 mol%, the color developability is insufficient, while if it exceeds 20 mol%,
It is not preferable because the finally obtained polyester fiber dyed product has markedly deteriorated physical properties.

The fineness and fiber physical properties of the polyester fiber used in the present invention are not particularly limited, and ordinary polyester fibers which have been used conventionally and those which have been used widely in recent years, such as "new synthetic fiber", should be used. The strength is usually preferably 0.3 g / denier or more,
It is more preferably 0.5 g / denier or more.

As for the shrinkage, boiling water shrinkage is -20 to 6
It is preferably in the range of 0%, more preferably in the range of 0 to 50%. Further, if necessary, it can be used as a false twisted textured yarn, or can be used as a spun yarn after being cut into staple fibers.

In the present invention, the polyester fiber is treated with an aqueous solution of basic aluminum acetate and / or a sulfate represented by the following general formula (1).

[0017]

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Specific examples of such compounds include potassium alum, sodium alum, and ammonium alum.

The basic aluminum acetate is not particularly limited as long as it is basic aluminum acetate, but it is represented by the following (2) or (3) because it has a greater effect of preventing strength deterioration described later. Basic aluminum acetate is preferred.

[0020]

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The above basic aluminum acetate may be present in the form of a hydrate in an aqueous solution.

The above aqueous solution treatment is usually performed at room temperature to 160.
It may be carried out at an appropriate temperature within the range of ℃, but if the temperature becomes too high, the fiber may deteriorate.
Treatment at 0 ° C. or lower is more preferable.

The amount of the above-mentioned metal salt compound used may be appropriately selected according to the amount of 5-sulfoisophthalic acid salt copolymerized with the above-mentioned polyester.
It is used within a range of 0.1 to 10 equivalents, more preferably within a range of 0.8 to 5 equivalents, relative to sulfoisophthalate.

The aqueous solution treatment in the present invention can be carried out on fibers of any form, and for example, it may be treated with filament yarn, staple fiber, false twisted yarn, etc., and treated with woven fabric or knitted fabric. May be. Usually, it is convenient to process it as a woven or knitted material.

In the present invention, the 5-sulfoisophthalate copolyester fiber is treated with the above metal salt compound aqueous solution and then dyed with a natural dye, but the natural dye used here is not particularly limited. Not so much, but plant dyes used for so-called plant dyeing, such as Akane, Sukata, Yuko, Clove, quintuplet, Sophora, stone, indigo, indigo, safflower,
Karian, purple root, red cabbage, oak, shibuki, kihada, sunflower, mirobaran, gerep, cochineal, catechu, logwood, tangalle, walnut, rack die and the like can be used.

In addition, general flowers, wildflowers, vegetables, fruits and the like, such as mandarin orange and onion soup, can be used. In addition, natural dyes for foods can also be used, and examples of such natural dyes for foods include paprika, perilla, mugwort, purple corn, grapes, korian, chlorophyll, red beet, red noodles, cacao, and coffee.

The above natural dyes may be used alone or in combination of two or more.

As a dyeing method using such a natural dye, a general plant dyeing method can be used. For example, the dyeing temperature can be arbitrarily selected in the range of room temperature to 130 ° C., but at a high temperature, strength deterioration and dye decomposition occur, and if the temperature is less than 60 ° C., the color developability tends to be slightly poor.
The range of 60 to 100 ° C is preferable.

Further, the pH of the dyeing liquor is often neutral, and dyeing is possible as it is, but it is better to adjust the pH of the dyeing liquor to about 3 to 5 using acetic acid or the like. It is preferable because the color developability is improved. Furthermore, the dye concentration is 10-2.
Although it can be arbitrarily selected in the range of 00% owf, the range of 40 to 100% owf is preferable from the viewpoint of color developability and dyeing property.

[0030]

The present invention will be described in more detail below with reference to examples, but the present invention is not limited to these examples.

The color developability and strength and elongation in the examples were measured by the following methods.

(1) Color developability With respect to the dyed cloth, Macbeth MS-2020 colorimeter [Instrumental Color System (Inst)
ruminal Color SystemLimi
manufactured by Ted), and L in the CIE color system,
The a, b and color developability (K / S) were measured. The larger the value of K / S, the higher the color developability.

(2) Strength and Elongation, Strength Retention Rate A yarn was taken out from the dyed fabric and the breaking strength and the breaking elongation were measured at room temperature using a vertical tensile tester. Furthermore, the value of the breaking strength was divided by the value of the breaking strength of the yarn extracted from the untreated cloth before the treatment with the aluminum compound aqueous solution, and the value multiplied by 100 was calculated as the strength retention rate (%).

Example 1 Nato 5-sulfoisophthalate
Polyethylene terephthale copolymerized with 4.5 mol% of lithium
Short fiber A (3 denier, strength 1.7 g /
Denier, elongation 70% and short fiber B (5 denier, strength)
2.0 g / denier, elongation 60%) and weight ratio 60: 4
A plain woven fabric made from 0 blended yarn (375 denier)
00g / m ^Two, Warp density 31 / cm, weft density 31
/ Cm). The obtained plain woven fabric is refined according to a conventional method.
After kneading and presetting, pull out the blended yarn from this plain weave
As a result of measuring the strength and elongation, the strength is 0.87 g / deny
And the elongation was 45%.

Next, 10% owf of basic aluminum acetate represented by the above formula (3) was used, and mordant treatment was carried out at 100 ° C. for 60 minutes at a bath ratio of 1:50, followed by washing with water.

Then, the woven fabric is divided into three parts, and as natural dyes, (i) western red rape liquid (ii) gardenia blue liquid (iii)
100% owf of each green leaf liquor, acetic acid 1g / l
Was added and the dyeing treatment was carried out at 100 ° C. for 30 minutes at a bath ratio of 1:50. Then, after thoroughly washing with water and air-drying, color development and strength / elongation were evaluated. Table 1 shows the results.

The color development (K / S) was measured at a measurement wavelength of 440 mμ for those stained with Western red radish, 600 mμ for those stained with gardenia blue, and 420 mμ for those stained with green leaves.

[Example 2] In Example 1, potassium alum was used in place of the basic aluminum acetate,
Otherwise, the treatment was performed under the same conditions as in Example 1. The results were as shown in Table 1.

[Comparative Example 1] The same treatment as in Example 1 was carried out except that aluminum sulfate anhydrous was used in place of the basic aluminum acetate. Table 1 shows the results
It was as shown in.

[Comparative Example 2] In Example 1, instead of the basic aluminum acetate, aluminum acetate normal salt (Al ₂
(CH ₃ CO ₂ ) ₂ ) was used, and otherwise the treatment was carried out under the same conditions as in Example 1. The results were as shown in Table 1.

[0041]

[Table 1]

Example 3 Using polyethylene terephthalate polymer in which tetrabutylphosphonium 5-sulfoisophthalate was copolymerized at 1.5 mol%, a polyethylene terephthalate polymer was spun at a spinning speed of 1500 m / min according to a conventional method and then stretched to 100
A denier / 72 filament multifilament yarn was obtained. The obtained multifilament yarn has a strength of 5.0 g.
/ Denier and elongation of 30%.

Using this multifilament yarn, a plain weave (weight per unit area of 188 g / m ² , warp density of 70 yarns /
cm, weft density 36 yarns / cm, weft twin yarn) were woven and refined and preset according to a conventional method.

As in Example 1, this plain woven fabric was added with 10% of the basic aluminum acetate represented by the above formula (3).
f After mordanting with an aqueous solution, divide the woven fabric into 3 parts, (i)
Staining was performed with Western madder solution (ii), gardenia blue solution (iii) and green leaf solution, and the color development and strength / elongation were evaluated. Table 2 shows the results.

Example 4 In Example 3, the treatment was carried out under the same conditions as in Example 3 except that ammonium alum was used in place of the basic aluminum acetate. The results were as shown in Table 2.

[Comparative Example 3] The same treatment as in Example 3 was carried out except that aluminum sulfate anhydrous was used in place of the basic aluminum acetate. Table 2 shows the results
It was as shown in.

[Comparative Example 4] In Example 3, the aluminum acetate normal salt (Al ₂
(CH ₃ CO ₂ ) ₂ ) was used, and the other conditions were the same as in the examples. The results were as shown in Table 2.

[0048]

[Table 2]

As is clear from Tables 1 and 2, when treated with the aqueous solution of the specific metal salt compound of the present invention (Example 1
~ 4), the strength of the dyed fiber is not significantly reduced,
It can be seen that when conventional aluminum sulfate anhydrous or aluminum acetate normal salt is used (Comparative Examples 1 to 4), the strength of the dyed fiber is greatly reduced. In particular, when treated with basic aluminum acetate (Examples 1 and 3), the effect of preventing reduction in strength of the dyed fiber is great.

[0050]

EFFECTS OF THE INVENTION According to the present invention, since harmful iron or copper is not used, the polyester fiber can be dyed with a natural dye, which is excellent in safety and handleability and is free from deterioration of strength. It is possible to express the natural color tone of the natural dye.

Claims (4)

[Claims] 1. A 5-sulfoisophthalate copolyester fiber is treated with an aqueous solution of basic aluminum acetate and / or an aqueous solution of a sulfate represented by the following general formula (1), and then treated with a natural dye. A method for dyeing a polyester fiber, which comprises dyeing. Embedded image 2. The method for dyeing a polyester fiber according to claim 1, wherein the 5-sulfoisophthalic acid salt is an alkali metal salt of 5-sulfoisophthalic acid. 3. The method for dyeing polyester fiber according to claim 1, wherein the basic aluminum acetate is a compound represented by the following formula (2) or (3). Embedded image 4. The method for dyeing a polyester fiber according to claim 1, wherein the sulfate represented by the general formula (1) is potassium alum, sodium alum or ammonium alum.