JPH0653978B2 - Black polyester fiber - Google Patents

Description

TECHNICAL FIELD The present invention relates to a black polyester fiber, and more particularly to a carbon black-containing black polyester fiber exhibiting a deep black color.

[Prior Art] Polyester fibers, especially polyethylene terephthalate fibers, have excellent physical and chemical properties and are widely used for clothing and industrial materials, but due to their molecular structure, they are poor in dyeability, and in order to improve them. Various investigations have been conducted on chemical and physical modification of raw materials and improvement of dyeing conditions. But,
It is difficult to modify polyester fibers without impairing their excellent physical properties, and this tendency is particularly noticeable when dark-colored dyeing is required, and there is no choice but to apply harsh dyeing conditions. Wastewater treatment requires a large amount of money.

[Problems to be Solved by the Invention] In order to solve these problems, in recent years, there has been an increasing demand for fibers made of a raw polyester which is obtained by directly adding and mixing a colorant to polyester. Since such a dyed polyester fiber is excellent in weather resistance and abrasion resistance, it is expanding its application to clothing and industrial materials from the viewpoint of resource saving and energy saving, but it is still dyed in terms of hue clarity. It is also true that its use is limited, as it is not limited to products.

In particular, a black polyester fiber containing carbon black (hereinafter sometimes referred to as a black dyed fiber) has many uses and demands, and various studies have been conducted to improve its hue.

For example, it is known that when post-processing the black dyed fiber with various processing agents, in particular, a low-refractive-index auxiliary agent such as a silicone-based auxiliary agent, the hue is improved, but the durability against washing is extremely low. It is rarely used except in special cases.

In addition, a method of reducing the primary particle size of carbon black to be added to and mixed with polyester or increasing the addition amount of carbon black has been studied, but carbon black has a primary particle size because of its strong cohesive force. As the particle size is decreased, the particles aggregate with each other to form coarse particles and do not contribute to the hue improvement.Even if the addition amount is increased, addition of a certain amount or more has no effect on the hue improvement for the same reason and is economical. It is an empirically known fact that not only loss, but rather productivity is reduced.

Further, JP-B-51-44220 and JP-B-58-30414 disclose that a green-based or blue-based organic dye is added to polyester in order to improve the hue of black-dyed fiber, especially to eliminate redness of black-dyed fiber. Although it has been proposed to include the pigment, the hue of the black dyed fiber certainly obtained was that the redness was removed as intended, but the hue was lacking in depth.

[Means for Solving Problems] It is an object of the present invention to solve these problems and provide a carbon black-containing black polyester fiber having a deep black color and excellent in durability against washing and the like. Is.

As a result of studies to achieve such an object, the present inventor has found that the hue of a black dyeing fiber containing three kinds of chromatic organic dyes having a specific structure is remarkably improved, and has arrived at the present invention.

That is, the present invention is a polyester fiber containing carbon black having a primary particle size of 10 to 40 mμ in an amount of 2 to 3% by weight based on the weight of the fiber, and the fiber includes (a) a perinone-based or anthraquinone-based red dye. , (B) anthraquinone brown dye, and (c) quinophthalone yellow dye, which are soluble in three polyesters having different colors,
It is a black polyester fiber characterized by being mixed in an amount of 0.01 to 0.1% by weight based on the weight of the fiber.

In the present invention, it is important that three kinds of dyes having different colors, that is, a perinone-based or anthraquinone-based red dye, an anthraquinone-based brown dye, and a quinophthalone-based yellow dye, are mixed in the black dyed fiber.

Here, when only two or less of these organic dyes having different hues are blended or when a dye insoluble in polyester is blended, the hue of the black dyed fiber is not improved so much.

Examples of the perinone red dye used in the present invention include CI Solvent Red 135 and CI Solvent Red 17
9, CI Solvent Red 180 and the like are anthraquinone red dyes such as CI Solvent Red 52 and CI Solvent Red.
Solvent Red 149, CI Solvent Red 151, etc. are used as the anthraquinone brown dye, for example, CI Pigment Brown 60, and as the quinophthalone yellow dye, CI Solvent Yellow 112, CI Solvent Yellow 113, CI Disperse Yellow 160, etc. are used. be able to.

In the present invention, the total blending amount of such organic dye is
It is 0.01 to 0.1% by weight with respect to the fiber weight. If the blending amount is less than 0.01% by weight, the hue of the black primary dyed fiber is not improved so much, while if it exceeds 0.1% by weight, the dye tends to be eluted into the solvent for dry cleaning or the like.

The blending ratio of the organic dyes used in the present invention is preferably 20 to 60%: 20 to 40%: 10 to 40% for red type: yellow type: brown type.

If the total amount of organic dyes is less than 0.1% by weight, 40% of blue-based organic dyes soluble in polyester can be used.
The phthalocyanine dye such as CI Solvent Blue 67 is particularly preferable.

The carbon black used in combination with such an organic dye has a primary particle diameter of 10 to 40 mμ and has a fiber weight of 2 to 3
It is important that the content is wt%.

Here, if the primary particle diameter is less than 10 mμ, the re-aggregation of the primary particles is likely to occur, so that the hue of the black-dyed fiber is reduced and the number of yarn breakages during melt spinning also increases. vice versa,
When the primary particle diameter exceeds 40 mμ, or when the blending amount of carbon black is less than 2% by weight, the hue of the black primary dyed fiber is lowered.

Further, even if the blending amount of carbon black exceeds 3% by weight, the effect of improving the hue of the black-dyed fiber is already saturated, and the reaggregation of carbon black increases.

The black dyed fiber of the present invention described above is a polyester containing a predetermined amount of carbon black and an organic dye (hereinafter, may be referred to as a master polyester).
It can be obtained by a method in which carbon black and a polyester containing no organic dye (hereinafter sometimes referred to as a base polyester) are mixed and melt-spun.

At this time, it is preferable to produce the master polyester from a part of the polyester used as the base polyester.

When the master polyester and the base polyester are subjected to melt spinning, the compatibility between them is good,
This is because there is no occurrence of mixed spots on the obtained black-dyed fiber or deterioration of basic performance such as strength and elongation.

The black dyed fiber obtained by mixing and spinning as described above may be used as it is after being stretched if necessary, or may be crimped and then cut to be a short fiber.

Incidentally, the polyester fiber targeted in the present invention is a fiber mainly composed of polyethylene terephthalate. However, 10 mol% or less of the third component relative to the repeating unit of ethylene terephthalate, for example, isophthalic acid component, P-
An oxybenzoic acid component, a benzoic acid component, a naphthalate component, a diethylene glycol component, a tetramethylene glycol component, a hexamethylene glycol component and the like may be copolymerized.

Further, a matting agent, an antistatic agent, which does not impair the object of the present invention,
A conductive agent or the like may be copolymerized or mixed.

[Action] Although it is not known in detail whether the black dyed fiber of the present invention can exhibit a deep black color, (a) a perinone or anthraquinone red dye, (b) an anthraquinone brown dye, and (c) ) By mixing three kinds of quinophthalone-based yellow dyes having different colors from each other,
It is presumed that the black of the carbon black can be further improved, and the amount of the dye compounded is such that it will not be eluted by washing such as dry cleaning.

[Advantage of the Invention] The black dyed fiber of the present invention can be applied not only to the conventional use of school clothes but also to the field of clothing requiring a deep black color.

[Examples] Hereinafter, the present invention will be described in more detail with reference to Examples.

The hue of the black dyed fiber was measured according to JIS Z 8729-1980 according to the following procedure.

That is, the black dyed fiber with a single yarn fineness of 3 de is cut into cotton,
After this cotton is aligned in the fiber axis direction with a card or the like to form a web, the web is laminated in four layers at right angles and molded to have an area of 0.25 mm ² and a weight of 1 to ² g. What was fixed with a spring or the like so as not to cause loosening was measured at 6 points with a spectrophotometer (color eye, colorimeter manufactured by Magbeth Co., Ltd.) and expressed as an average value of L ^* , a ^* , and b ^* . here,
A lower L ^* value indicates a deeper black color.

The dry cleaning resistance is represented by the contamination series according to JIS-Z-0860.

Examples 1 to 13 Comparative Examples 1 to 11 Master polyester chips in which carbon black (average particle size 20 mμ) and polyester soluble organic dyes shown in Table 1 are dispersed and mixed in polyethylene terephthalate chips using a biaxial type kneading device. Got Then, the master polymer and polyethylene terephthalate (base polyester) containing no carbon black were mixed in the proportions shown in Table 1, spun, stretched and cut to obtain cotton consisting of black discolored fibers shown in Table 1. A sample for measurement is prepared from the obtained cotton according to the above-mentioned procedure, and the color measurement result and the dry cleaning resistance test result are shown in Table 1 together.

In Table 1, CI Solvent Red 135 is used as perinone red, CI Solvent Red 52 is used as anthraquinone red, CI Pigment Brown 60 is used as anthraquinone tea, and CI Solvent Yellow 113 is used as yellow quinophthalone and phthalocyanine blue is used. CI Solvent Blue 67 and CI Pigment Green 7 were used as phthalocyanine green.

The cottons made of the black-dyed fiber of Examples 1 to 13 are Comparative Examples 1 to 11.
Compared with the cotton made from black dyeing, all of them showed a deep black color, and it was not necessary to further treat with a silicone-based treating agent in the post-processing step.

On the other hand, Comparative Examples 1 to 7 can show a deep black color by being treated with a silicone-based processing agent in the post-processing step, but the dry cleaning resistance is inferior to the second to third grades. It was

Continuation of front page (56) Reference JP-A-55-12811 (JP, A) JP-A-50-37849 (JP, A) JP-B-58-30414 (JP, B2)

Claims (2)

[Claims] 1. A polyester fiber containing carbon black having a primary particle diameter of 10 to 40 mμ in an amount of 2 to 3% by weight based on the weight of the fiber, wherein the fiber includes (a) a perinone-based or anthraquinone-based red dye, 0.01 to 0.1% by weight of the organic dye soluble in three kinds of polyesters (b) anthraquinone brown dye and (c) quinophthalone yellow dye, which are different in color from each other, are blended with respect to the fiber weight. And black polyester fiber. 2. A black polyester according to claim 1, which contains a phthalocyanine blue dye soluble in polyester as the organic dye, and the total amount of the organic dyes is 0.1% by weight or less based on the weight of the fiber. fiber.