JP4665557B2 - Black original polyester fiber - Google Patents

Description

  The present invention relates to a black original polyester fiber having quality superior to that of the prior art.

  Polyester fiber is a fiber having high strength, high Young's modulus, and excellent thermal dimensional stability, and is widely used for clothing and industrial materials.

  Among them, the black original polyester fiber is used for various uses such as an embroidery thread as a polyester fiber having a deep black color, which is difficult by normal dyeing.

  However, since the black original polyester fiber uses particles such as carbon black as a black original component, it has been problematic in terms of quality.

  The first point is to greatly promote the wear of the needle when used for knitting. This is considered that the carbon black particle which has come out on the surface of a fiber wears a needle | hook.

  The second point is that when it is made into a fabric, unnecessary gloss may appear on the surface, and the apparent blackness may be inferior. Although this cause is not certain, it is thought that it occurs when the carbon black particles are uniformly exposed on the fiber surface and the light reflection phase is aligned.

  In order to solve this problem, a method of improving the blackness and strength of the fiber by incorporating zinc powder and glass fiber in addition to carbon black has been proposed (see Patent Document 1). However, this method is insufficient in blackness and does not mention improvement of wear.

In addition, a method for improving the wear properties by setting the particle size of carbon black within a specific range has been proposed (see Patent Document 2). However, even with this method, the improvement in wearability is not sufficient, and the blackness is also insufficient.
JP 08-41318 A (page 2) JP 08-322707 A (second page)

  An object of the present invention is to solve the above-mentioned conventional problems, and is to obtain a black original polyester fiber having a quality superior to that of the prior art, deepening blackness, and when knitting this, It is an object of the present invention to provide a black original polyester fiber capable of reducing the wear of a knitting needle.

In order to achieve the above object, the present invention adopts the following configuration. That is,
(1) Two or more types of carbon black, carbon black A having an average primary particle size of 0.05 μm to 0.3 μm and carbon black B having an average primary particle size of 0.4 μm to 2.0 μm, A black original polyester fiber, wherein the carbon black is contained in an amount of 0.5% by weight to 5% by weight with respect to the black original polyester fiber.

  (2) The black original polyester fiber as described in (1) above, wherein the ratio of carbon black A to the total weight of carbon black is 15 to 85% by weight.

  According to the present invention, in the black original polyester fiber, the blackness becomes deeper, and it becomes possible to reduce the wear of the knitting needle when knitting it.

  The black original polyester used in the black original polyester fiber of the present invention may be obtained by remelting a polyester obtained by polymerization by a conventional method and directly kneading the carbon black particles. Alternatively, the master pellet containing a high concentration of carbon black and the polyester may be melted and kneaded separately, or a mixture of the master pellet and the polyester pellet in a solid state may be melt-kneaded. Further, when the polyester is polymerized, it may be added to the polymerization reaction system at an arbitrary stage.

  Specific examples of the polyester used in the black original polyester fiber of the present invention include, for example, polyethylene terephthalate, polypropylene terephthalate, polytetramethylene terephthalate, polyethylene-2,6-naphthalene dicarboxylate, polyethylene-1,2-bis (2 -Chlorophenoxy) ethane-4,4'-dicarboxylate and the like. The present invention is suitable for polyethylene terephthalate or polyester copolymer mainly containing ethylene terephthalate units, which is most commonly used.

  These polyesters may be copolymerized with various ester-forming derivatives as long as the objects and effects of the present invention are not impaired.

  In addition, these polyesters contain additives such as anti-coloring agents, stabilizers, and antioxidants in addition to various functional particles such as silicon oxide and kaolin, as long as the objects and effects of the present invention are not impaired. May be.

  The black original polyester fiber of the present invention comprises two or more carbon blacks contained as black original components having different average primary particle sizes. When only one type is contained, the unevenness formed by the carbon black exposed on the fiber surface becomes uniform, so that the wear of the knitting needles when knitted is promoted. The mixing method of two or more kinds of carbon blacks may be in accordance with a general method, and may be either a batch type or a continuous type, and may be mixed in the form of a powder or in a slurry using an appropriate solvent. .

  Among the two or more types of carbon black contained in the black original polyester fiber of the present invention, carbon black A having the smallest average primary particle size has an average primary particle size of 0.05 μm or more and 0.3 μm or less. When the average primary particle size is larger than 0.3 μm, all of the carbon black contained in the black original polyester fiber is large, so that the light reflected on the fiber surface when used as a fabric is aligned and unnecessary gloss is produced. On the other hand, when the thickness is less than 0.05 μm, the unevenness formed by the carbon black exposed on the fiber surface becomes too small and dense, so that the wear of the knitting needle when this is knitted is promoted. Preferably it is 0.2 micrometer or less.

  Among the two or more types of carbon black contained in the black primary polyester fiber of the present invention, carbon black B having the largest average primary particle size has an average primary particle size of 0.4 μm or more and 2.0 μm or less. When the diameter is smaller than 0.4 μm, all the carbon black contained in the black original polyester fiber is small, so that the unevenness formed by the carbon black exposed on the fiber surface becomes small, so that the knitting needle wears when knitting it is promoted. Is done. If it is larger than 2.0 μm, the carbon black exposed on the fiber surface tends to be detached when it comes into contact with a knitting needle or the like, which may cause problems such as contamination of the knitting machine. Preferably, it is 0.7 μm or less.

  In the black original polyester fiber of the present invention, the ratio of carbon black A to the total weight of carbon black contained is preferably 15 to 85% by weight. When the proportion of carbon black A is less than 15% by weight or more than 85% by weight, the unevenness formed by the carbon black exposed on the fiber surface becomes uniform, so that the wear of the knitting needle when this is knitted is promoted.

In the black original polyester fiber of the present invention, the total weight of the carbon black contained needs to be 0.5% by weight or more and 5% by weight or less with respect to the black original polyester fiber . More preferably, it is 1.5 to 3% by weight.

  Next, the manufacturing method of the black original polyester fiber of this invention is demonstrated. Although the example of the black original polyester fiber using a polyethylene terephthalate is described as a specific example, it is not limited to this.

  Polyester fibers are usually (1) a process in which the polyester is melted, weighed, filtered, and discharged, (2) a process in which the discharged polyester filament is cooled by cooling air, and then (3) It is obtained by a winding process and (4) a process of stretching or stretching false twisting of the polyester fiber obtained in some cases.

  When obtaining the black original polyester fiber of the present invention, any of the above processes (1) to (4) may be performed by a conventional method.

Hereinafter, the present invention will be described in more detail with reference to examples. In addition, the physical-property value in an Example was measured by the method described below.
(1) Intrinsic viscosity of polymer IV
Measurement was performed at 25 ° C. using orthochlorophenol as a solvent.
(2) Average primary particle diameter of carbon black Using a DLS-6000 multi-angle light scattering photometer Ar laser type manufactured by Otsuka Electronics Co., Ltd., an average primary particle diameter was calculated using a sample in which carbon black was dispersed in water.
(3) Knitting Needle Abrasion The obtained black original polyester fiber is first passed through a tensor, and then at the uppermost part of the knitting needle 1000-KFPS-46.58-G-12 manufactured by GROZ-BECKERT, the angle 45 of the horizontal and vertical planes Measure the depth of wear of the needle when it is run for 240 minutes at a running speed of 250 m / min. A wear depth of less than 10 μm was evaluated as ◎, 10 μm or more but less than 50 μm as ◯, 50 μm or more but less than 100 μm as Δ, and 100 μm or more as x.
(4) Blackness The obtained black original polyester fiber is wound almost uniformly on a plate having a width of 5 cm. Using this plate winding, the L value was measured with S & M color computer SM-4 manufactured by Suga Test Instruments Co., Ltd. L value less than 15 was marked with ◎, 15 and less than 16 with ◯, 16 and less than 18 with Δ, and 18 or more with x.

Example 1
Carbon black A having an average primary particle size of 0.25 μm and carbon black B having an average primary particle size of 0.40 μm are mixed as powders in a batch mixer at a weight ratio of 50/50. A black original polyethylene terephthalate polymer pellet having an intrinsic viscosity IV of 0.64 obtained by a conventional method is dried according to a conventional method except that the carbon black is added at the time of polymerization so that the total amount of carbon black is 3.0% by weight. . The dried pellets were melted and discharged from the die at a polymer temperature of 290 ° C., cooled with cooling air, and wound up at a speed of 1800 m / min after applying the oil. Next, the obtained black unstretched polyester unstretched fiber was heat-stretched by 2.2 times to obtain 84 dtex, 24 filament black unstretched polyester fiber. As a result of evaluating needle wear and blackness using this, good results were obtained as shown in Table 1.

Example 2
Polymerization, pelletizing, drying, spinning and stretching were carried out in the same manner as in Example 1 except that the average primary particle size of carbon black A was 0.10 μm to obtain 84 dtex, 24-filament black polyester fiber. As a result of evaluating needle wear and blackness using this, good results were obtained as shown in Table 1.

Example 3
Polymerization, pelletizing, drying, spinning and stretching were carried out in the same manner as in Example 1 except that the average primary particle size of carbon black B was 0.50 μm to obtain 84 dtex, 24-filament black polyester fiber. As a result of evaluating needle wear and blackness using this, good results were obtained as shown in Table 1.

Example 4
Polymerization, pelletizing, drying, spinning and stretching were carried out in the same manner as in Example 1 except that the average primary particle size of carbon black A was 0.05 μm and the weight ratio of A and B was 85/15, and 84 dtex was obtained. 24 filaments of black original polyester fiber was obtained. As a result of evaluating needle wear and blackness using this, good results were obtained as shown in Table 1.

Example 5
Polymerization, pelletizing, drying, spinning and stretching were carried out in the same manner as in Example 1 except that the weight ratio of carbon blacks A and B was 95/5 to obtain 84 dtex, 24 filaments of black original polyester fiber. As a result of evaluating needle wear and blackness using this, as shown in Table 1, both needle wear and blackness were inferior to those of Examples 1 to 4, but were sufficiently practical.

Example 6
Polymerization, pelletizing, drying, spinning and stretching were carried out in the same manner as in Example 1 except that the average primary particle size of carbon black B was 0.70 μm and the weight ratio of A and B was 15/85, and 84 dtex was obtained. 24 filaments of black original polyester fiber was obtained. As a result of evaluating needle wear and blackness using this, good results were obtained as shown in Table 2.

Example 7
Polymerization, pelletizing, drying, spinning and stretching were carried out in the same manner as in Example 1 except that the weight ratio of carbon blacks A and B was 5/95 to obtain 84 dtex, 24-filament black polyester fiber. As a result of evaluating needle wear and blackness using this, both needle wear and blackness were inferior to those of Example 6 as shown in Table 2, but they were sufficiently practical.

Examples 8, 9, 10
Polymerization was performed so that the total amount of carbon blacks A and B was 1.5% by weight (Example 8), 0.5% by weight (Example 9), and 5.0% by weight (Example 10 ) with respect to the obtained pellets. Polymerization, pelletizing, drying, spinning and spinning in the same manner as in Example 1 except that the average particle size of carbon black B was changed to 1.00 μm (Example 9) and 2.00 μm (Example 10). Drawing was performed to obtain a black original polyester fiber having 84 dtex and 24 filaments. As a result of evaluating needle wear and blackness using this, good results were obtained as shown in Tables 2 and 3.

Comparative Example 1
Polymerization, pelletizing, drying, spinning and stretching were performed in the same manner as in Example 1 except that the average primary particle size of carbon black A was 0.30 μm and the average primary particle size of carbon black B was 0.35 μm. 84 dtex, 24 filaments of black original polyester fiber was obtained. As a result of evaluating needle wear and blackness using this, both needle wear and blackness were inferior as shown in Table 3.

Comparative Example 2
Polymerization, pelletizing, drying, spinning and stretching were performed in the same manner as in Example 1 except that the average primary particle size of carbon black A was 0.35 μm and the average primary particle size of carbon black B was 0.40 μm. 84 dtex, 24 filaments of black original polyester fiber was obtained. As a result of evaluating needle wear and blackness using this, both needle wear and blackness were inferior as shown in Table 3.

Claims (2)

Two or more types of carbon black, carbon black A having an average primary particle size of 0.05 μm or more and 0.3 μm or less and carbon black B having an average primary particle size of 0.4 μm or more and 2.0 μm or less, Is contained in an amount of 0.5% by weight or more and 5% by weight or less based on the black original polyester fiber. 2. The black original polyester fiber according to claim 1, wherein the ratio of carbon black A to the total weight of carbon black is 15 to 85% by weight.