JP3267854B2 - Black raw polyester fiber - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a black dyed polyester fiber, and more particularly to a roller and a guide which have good smoothness on the surface of the fiber and come into contact with the fiber during the production of the fiber, the forming of the obtained fiber or the use of a fiber molded product. The present invention relates to a black-stained polyester fiber which suppresses wear of accessories such as the above, and has a small deterioration in cutting strength during use.

[0002]

2. Description of the Related Art Polyesters, particularly polyethylene terephthalate, have excellent physical and chemical properties and are therefore widely used not only for clothing but also for industrial and construction purposes. However, these polyester fibers have a serious drawback of poor dyeability, and as a method for improving this, a method of mixing and dispersing a pigment or a dye in a polyester polymer, that is, a coloring method based on soaking has been conventionally studied.

[0003] For example, a black polyester fiber obtained by soaking (black undyed polyester fiber) is melt-spun by adding carbon black at the time of polyester polymerization or at any stage from after polymerization to yarn production (Japanese Patent Application Laid-Open No. 50-62296).
JP-A-59-71357, JP-A-61-71357
No. 228061) has been proposed. Japanese Patent Application Laid-Open No. 61-228061 discloses the use of carbon black having an oil absorption amount and a volatile content in a specific range. It is described as preferred.

However, according to the study of the present inventors, such a conventional polyester blended with carbon black is subjected to melt-spinning stretching, particularly to high-magnification stretching in order to obtain high-strength fibers for industrial use. In addition, the surface of the obtained fiber is likely to be formed with projections and become rough, so roller wear, guide wear, etc. occur, and the fiber molded product wears the contact part of the accessory, and furthermore, the fiber There was a problem that the friction deteriorated due to friction, and it was not satisfactory.

[0005]

SUMMARY OF THE INVENTION An object of the present invention is to provide a black-dyed polyester fiber which solves the above-mentioned problems of the prior art and has excellent smoothness on the fiber surface and good abrasion resistance.

[0006]

Means for Solving the Problems The inventors of the present invention have conducted intensive studies to achieve the above object, and as a result, it has been found that a polyester to which carbon black having specific characteristics is added has a fiber surface when melt-spun and drawn. It was found that the obtained black-dyed polyester fiber had good properties because it did not have a rough surface, and the present invention was reached.

That is, the object of the present invention is to provide an "average primary particle diameter of 5 to 25 mμ and an oil absorption of 30 to 80 ml / 1.
A black-dyed polyester fiber containing 0.3 to 1.0% by weight of carbon black having a property of 00 g and a specific surface area of 150 to 300 m ² / g. Is achieved.

[0008]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The carbon black of the present invention is characterized in that it is a carbon black having specific properties satisfying the following requirements.

First, the average particle size is 5 to 25 mμ, preferably 10 to 20 mμ. The average particle diameter was determined by dispersing carbon black in chloroform by ultrasonic waves, placing it on a sheet mesh covered with an acetylcellulose film on which carbon was deposited, and projecting it with a transmission electron microscope.
It is determined by selecting 000 particles, measuring the particle size, and calculating the number average particle size.

Second, the oil absorption is 30 to 80 ml / 100.
g, preferably 40 to 60 ml / 100 g. The oil absorption was determined by taking 1.00 g of the dried carbon black sample on a lithotripte having a smooth surface, dripping dibutyl phthalate little by little, and stirring well with a stainless steel spatula to form the sample and dibutyl terephthalate into one spherical shape. It is determined by measuring the minimum amount of dibutyl phthalate and converting it to the amount of dibutyl phthalate (ml) per 100 g of carbon black.

Third, the specific surface area is 150 to 300 m ² / g.
It is. This specific surface area is represented by the surface area (m ² ) per unit weight (g) of carbon black, and can be calculated from the iodine adsorption amount.

It is important that the carbon black in the present invention satisfies all three requirements. When carbon black which does not satisfy any one of these requirements is used, a large number of projections caused by carbon black particles are formed on the surface of the obtained black-dyed polyester fiber. Roller abrasion or guide abrasion occurs during spinning or weaving, or when formed into a fiber molded product, the molded product accessories that come into contact with the molded product are easily worn, and the fiber strength is reduced due to friction between the fibers. And other drawbacks.

The method for producing carbon black in the present invention is not particularly limited as long as it satisfies all the above three requirements. As methods for producing carbon black, for example, furnace incomplete combustion, channel incomplete combustion, and pyrolysis are known. Among these, the furnace-type incomplete combustion method is preferred as the method for producing carbon black in the present invention, from the viewpoint of ease of production and environmental management.

In order to obtain carbon black having a specific average primary particle diameter, oil absorption, and surface area according to the present invention, in the furnace type incomplete combustion method, the temperature of the reactor for pyrolysis of the raw material hydrocarbon, the disturbance of the raw material supply, and the like. It is preferable to adopt a method of optimizing the flow diffusion state, the location of the spray water cooling immediately after thermal decomposition, the amount of addition, and the like.

The polyester in the present invention may be any polyester as long as it forms a fiber.
Preferred are polyethylene terephthalate, polytetramethylene terephthalate, poly-1,4-cyclohexylene dimethylene terephthalate, polyethylene 2,6-naphthalenedicarboxylate and the like.

These polyesters may be homopolyesters as described above, or may be copolyesters. In the case of a copolyester, it is preferable that the above-mentioned homopolyester is copolymerized with a third component in a small proportion (for example, 20 mol% or less). Examples of such a third component include diethylene glycol, neopentyl glycol, and polyalkylene. Diol components such as glycols,
Adipic acid, sebacic acid, phthalic acid, isophthalic acid, 5
And dicarboxylic acid components such as sodium sulfoisophthalic acid. Above all, the intrinsic viscosity (measured at a temperature of 35 ° C. using orthochlorophenol as a solvent) is O.D. 80
When it is polyethylene terephthalate of ~ 0.95,
The effect of eliminating protrusions on the fiber surface is large and preferable.

In the present invention, the content of the above-mentioned carbon black in the polyester must be 0.3 to 1.0% by weight, preferably 0.5 to 0.7% by weight. If the content of carbon black is too small, not only is the degree of coloring as a black-dyed fiber insufficient, but also the problem of roughening the fiber surface without using the carbon black defined in the present invention is a problem. Does not occur. On the other hand, when the content is 1.0
If the content is too large, the density of protrusions formed on the fiber surface increases, and the abrasion resistance decreases, so that the object of the present invention cannot be achieved.

It is not necessary to employ a special method for blending the above carbon black into the polyester fiber. For example, a method of adding the carbon black in a polyester polymerization step, a method of forming a master pellet and then kneading with a base polyester containing no carbon black. A method in which a liquid additive composition previously mixed with carbon black and a liquid polyester is injected into a molten polyester stream just before spinning while being measured by a gear pump or the like, and then statically or dynamically kneaded and dispersed. Can be Among them, the method using master pellets can be said to be the most common in consideration of the contamination of the spinning device, the handling property, the cost, and the like. In any case, after blending, fiberization can be performed by a known melt spinning / drawing method. At this time, the spinning and drawing step, particularly the drawing step, is controlled to reduce the fiber cutting strength to 8.0 to 9.5.
g / de, especially 8.5 to 9.5 g / de, is preferred because the effect of suppressing the formation of protrusions on the fiber surface is large.

The fiber cross-sectional shape of the present invention is arbitrary, and may be any of a round cross-section fiber, an irregular cross-section fiber, and a hollow fiber. Further, in the fiber of the present invention, in addition to the carbon black, a matting agent, an antistatic agent, a fluorescent whitening agent, a hygroscopic agent,
Modifiers such as ultraviolet absorbers, light stabilizers, and antibacterial agents and functionalizing agents may be contained within a range that does not impair the effects of the present invention.

[0020]

Although the detailed reason for the black-dyed polyester fiber of the present invention described above has not been elucidated, fine projections are not formed on the fiber surface.
Roller wear during spinning and molding of the resulting fiber
Guide wear is reduced, and a high-quality product can be stably obtained. Further, wear of the contact portion between the obtained fiber molded article and the accessory of the molded article and wear due to friction between fibers in the molded article are reduced, and durability is improved.

[0021]

EXAMPLES The present invention will be described in more detail with reference to the following Examples, but it should not be construed that the present invention is limited to the following Examples unless the gist of the invention is exceeded. In addition, each physical property value in an Example was measured by the following method.

(1) Intrinsic viscosity A sample was dissolved in 10 ml of orthochlorophenol,
Measured at ° C.

(2) Fiber Surface Observation The fiber surface was observed at a magnification of 2000 times with a scanning electron microscope, and the number of protrusions having a size of 0.5 μm or more existing in the fiber surface of 15 μm × 15 μm was counted. When the number was less than 10, it was evaluated as good (良好), when 10 or more and less than 20, it was slightly poor (△), and when 20 or more was bad (x).

(3) Degree of wear After heating the sample fiber with a roller heated to 200 ° C. using the apparatus shown in FIG. 1, the tension was 2.0 kg on a hard chrome plated satin bar having a roughness of 6S, and the speed was 190 m / m. mi
After running for 300 minutes at n, the abrasion state of the satin bar was observed by a replica method, and a five-point evaluation of 1 to 5 was performed from a mild abrasion state.

Examples 1-3 and Comparative Examples 1-4 Polyethylene terephthalate chips having an intrinsic viscosity of 0.64
After preliminary drying at 5 ° C. for 2 hours, solid-state polymerization of polyethylene terephthalate having an intrinsic viscosity of 1.0 obtained by solid-phase polymerization at 235 ° C. was kneaded with carbon black as shown in Table 1 and mixed.
An intrinsic viscosity of 0.6 containing 0% by weight of carbon black
0 master chips were made.

This master chip was mixed with a polyethylene terephthalate solid-phase polymerization chip having an intrinsic viscosity of 1.0 at a ratio such that the carbon black content in the resulting fiber was as shown in Table 1, and heated at a melting temperature of 290 ° C. It is melted and discharged from a spinneret having a discharge hole having a diameter of 0.6 mm.
It was withdrawn at a speed of 0 m / min. The obtained undrawn yarn is 8
After the first-stage stretching at a roller temperature of 0 to 110 ° C. by a factor of 3.6, 1.
The second-stage drawing was performed at 61 times (total drawing ratio: 5.8 times: 0.86 times the maximum drawing ratio) to obtain a 1500-denier / 144-filament black soaked polyester fiber. The results are shown in Table 1.

[0027]

[Table 1]

As apparent from Table 1, even when the fiber surface of the present invention was observed at a magnification of 2000 times with a scanning electron microscope, almost no fine projections were observed, and almost no white protrusion containing carbon black was found. The same surface shape is observed, and the wear test results show that the degree of wear is the same as that of the white yarn (Examples 1 to 3). On the other hand, fibers containing carbon black outside the present invention have many projections on the surface,
The wear resistance is also insufficient (Comparative Examples 1 to 4).

[Brief description of the drawings]

FIG. 1 is a schematic diagram of an accelerated wear test used in the present invention.

[Explanation of symbols]

 REFERENCE SIGNS LIST 1 drawn yarn supply bobbin 2 free roller 2 'free roller 3 supply heating roller 3' take-up roller 4 satin bar 5 drawn yarn 6 winding bobbin

────────────────────────────────────────────────── (5) References JP-A-7-258918 (JP, A) (58) Fields investigated (Int. Cl. ⁷ , DB name) D01F 6/92 301-309 D01F 6/62 301-308 D01F 1/00-1/10

Claims (3)

(57) [Claims] An average primary particle diameter of 5 to 25 mμ, an oil absorption of 30 to 80 ml / 100 g and a specific surface area of 150 to 3
Carbon black having a property of 00 m ² / g of 0.3
Black-dyed polyester fiber containing 1.0 to 1.0% by weight. 2. The polyester has an intrinsic viscosity of 0.80 to 0.80.
2. Polyethylene terephthalate of 0.95.
The black dyed polyester fiber as described. 3. The fiber has a cutting strength of 8.0 to 9.5 g / d.
3. The black-dyed polyester fiber according to claim 1, which is e.