JPS6059122A - Production of antistatic combined filament yarn - Google Patents

Abstract

PURPOSE:To obtain antistatic combined filament yarns having improved mechanical properties and high-degree of processability, by melting separately an electrically conductive polymer and an electrically nonconductive polymer, feeding the molten polymers separately to the interior and exterior of a spinneret, extruding conjugate fibers of both through inner extrusion holes of the spinneret, extruding the latter through the outer extrusion holes, combining both, and drawing the resultant filament yarn. CONSTITUTION:An electrically conductive polymer containing 15-50wt% electrically conductive carbon black is melted and fed to the interior of a spinning pack 3, and an electrically nonconductive polymer having fiber-forming properties is melted and fed to the exterior of the spinning pack 3. Both polymer streams are combined in the interior of spinnerets 4-6 under the spinning pack 3, and electrically conductive conjugate filament yarn of sheath-core type is extruded through the inner extrusion holes 62' of a spinneret 6. An electrically nonconductive filament yarn is extruded through the outer extrusion holes 62 of the spinneret 6, and both filament yarns are combined and then drawn.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for producing an antistatic mixed fiber yarn made by mixing composite fibers containing conductive carbon black as one component. The present invention relates to the Jj method for efficiently and stably producing the above-mentioned mixed yarn having good passability through subsequent processing in a spinning process.

Natural fibers or synthetic fibers generally have electrical insulation properties and have the disadvantage of being susceptible to static electricity due to friction or the like. Therefore, conductive carbon black is widely mixed in order to prevent electrostatic charge.However, since conductive carbon black is black, fibers made with the carbon black are blended with it. is black or gray and the color is poor.

In order to solve this color problem, we created a composite fiber with a carbon black-containing polymer as the core and a braided polymer sheath on the outside. A method of incorporating a matting agent is known. However, with this method (single-component fiber), the thickness of the sheath must be made considerably thicker in order to erase the black color of carbon black. The disadvantage is that the core becomes thinner and the conductivity decreases.

1, when a matting agent is blended, the amount of the matting agent must be increased, which has the drawback of deteriorating the spinning properties and fiber properties.

Therefore, in order to improve this, it has been proposed that a conductive composite fiber containing a conductive carbon black-containing polymer as one component be combined with a normal fiber to create a mixed fiber yarn (Japanese Patent Publication No. 52-81450). Public bulletin).

However, since this mixed yarn is made by combining a yarn made of conductive composite fiber with a yarn made of other ordinary fibers, a small amount of conductive composite fiber is mixed into the mixed yarn. It's not easy to weave. That is, as the Jj method in which a small amount of conductive polymer Kasuri is mixed, conductive composite fiber yarn obtained by spinning in a normal method is divided into ultrafine yarn with a small number of single yarns, and then other There is a method of combining fibers with other fibers, but this method involves the process of splitting the low-strength conductive composite fiber yarn and handling it as ultra-fine yarn, so problems such as yarn breakage occur frequently. Moreover, this method of dividing and doubling yarns has the drawback that it is difficult to produce fine denier mixed fiber yarns, and it is also difficult to mix two types of fibers uniformly. This is because it has poor passability through higher processing such as during weaving and weaving.

Therefore, as a result of studying a method for manufacturing an antistatic mixed fiber yarn that does not have the above drawbacks, we found that the conductive component Yoshi J1 and the conductive component were separately fed into the same spinneret after being beaten with eggs. If a conductive component and a part of a non-conductive component are composited, and the conductive composite fiber and non-conductive fiber are simultaneously spun and mixed from this spun Uj gold, it will have good passability through higher-order processing and can be easily machined. The efficiency of the mixed fiber yarn with excellent physical properties is 1: <7!7; when all the fibers are mixed during melt spinning, the conductive component flows into the central inflow hole, and the non-conductive component flows into the peripheral region. The conductive composite fibers are supplied to the holes respectively, and the conductive composite fibers are supplied from the inner discharge holes.
On the other hand, the inventors have found that simultaneously discharging the non-conductive fibers from the outer discharging holes is effective for stably obtaining the mixed fiber yarn, leading to the present invention.

The main purpose of the present invention is to provide a method for efficiently and stably producing an antistatic mixed fiber yarn with excellent mechanical properties and high-order processing properties, and to achieve all of these purposes. Therefore, the present invention uses conductive carbon black of 15 to 5
A conductive polymer component containing 0% by weight is melted and supplied to the central inflow hole of the spinneret, while a fiber-forming non-conductive polymer component is melted and supplied to the peripheral part of the spinneret. forming a composite polymer stream from the electrically conductive polymer component and a portion of the non-conductive polymer component within the spinneret, and supplying the composite polymer stream from an inner discharge hole of the spinneret. At the same time, non-conductive fibers made of the non-conductive polymer are spun out from the outer discharge hole of the spinneret, mixed, stretched and wound. It is used to manufacture filaments.

The conductive composite fiber contains 15% conductive carbon black.
The fiber is a composite of a conductive polymer component containing ~50% by weight and a fiber-forming non-conductive polymer component in any type, and the composite forms include core-sheath type, laminated type,
I can't give you the modified type or matrix distributed type.

In order to impart high whiteness to the yarn, it is preferable that the conductive component does not substantially appear on the surface of the fiber, and a core-sheath type is preferable. Preferably, this composite fiber has high electrical conductivity with a specific resistance of less than 10<7 > cm. The composite ratio (weight ratio) of the conductive component and the non-conductive component is 1/99 to 80
/70 is preferable.

The conductive polymer component is conductive carbon bran 221
It is necessary that the content be 5 to 50% by weight (maximum based on the total of the components listed in 2). When the carbon black content is low, sufficient conductivity cannot be obtained;
It becomes difficult to spin the yarn, and the resulting composite fiber & (
The characteristics of l also deteriorate.

Matrix i forming this conductive polymer component [coalescence is
Any synthetic polymer that can be melt-extruded may be used, and it does not need to be particularly fiber-forming. Suitable polymers include polyamides, polyesters, polyethers, polyolefins, and copolymers thereof.

The non-conductive fibers are made of the non-conductive polymer component, and the fiber-forming matrix polymer constituting the non-conductive polymer component includes polyamide, polyester, polyolefin/copolymer thereof. However, since the physical properties such as strength of conductive composite fibers mainly depend on the polymer properties of this non-conductive polymer component, it is necessary to use a polymer with sufficient strength as this non-conductive polymer component. It is preferable to use

Each of the above ingredients includes a matting agent and an ultraviolet absorber.

Additives such as acid inhibitors, photodegradation inhibitors, and substantially non-colored organic antistatic agents may also be included.

Mixing ratio of the conductive composite fiber and the non-conductive fiber (
The fineness ratio) is preferably 2/98 to 50150, and in order to obtain even better conductivity and self-spacing, it is 3/97.
It is preferable that it is 80/70.

It is preferable that the obtained mixed fiber yarn has a total fineness of at least 15 deniers from the viewpoint of passability through higher processing.

Next, the manufacturing method of the present invention will be explained using the drawings.

FIG. 1 is a schematic diagram of the main parts of the melt spinning process showing one embodiment of the method of the present invention, and FIGS. 2 to 6 show an embodiment of the spinneret used in the method of the present invention, and・Figure 4 is a plan view showing the upper, middle, and lower eight spinneret plates of the spinneret;
Figure 6 shows the V-V cross section in Figures 2 to 4, ■-V+
FIG. 2 is a cross-sectional view of a spinneret showing a cross section.

First, conductive carbon black, matrix polymer,
A conductive polymer component (A)t mixed with other additives as necessary in a conventional manner is supplied to the first melt extrusion means 1,
It is melted and supplied in fixed amounts to the central polymer section 31 of the spinning pack 3 using the first pump 2. The melt extrusion means 1 used here may be, for example, an extruder embossing 11, a pressure melter type extruder, or a Yohimelt grid type extruder, but the conductive polymer component is used in a total proportion. Since the temperature is low, it is necessary to use a means that can melt all of the low-ry polymer components with high precision.

On the other hand, the fiber-forming non-conductive polymer is mixed with additives if necessary in a conventional manner, fed to the second melt extrusion means 1', melted, and melted by the second metering pump 2'. &FB, are supplied to the peripheral polymer section 32 of the spinning bag. The second melt extrusion means 1' used here is the same as the first melt extrusion means 1 described above.

In the embodiment shown in the drawings, the spinneret has -1-, middle, and lower CIs.
It is composed of all metal plates 4, 5, and 6, and the inflow hole for the conductive polymer component (A) is located in the center of the two-metal plate part 4.
It is essential that the inlet hole for the non-conductive polymer component (B) be formed around the upper metal plate portion 40.

The conductive 5IL integrated component (A) enters from the central polymer section 31 into the central inlet hole 41 of the upper die plate section 4 of the spinneret, and then passes through the transition passage 51 and exits the core component discharge hole 51' through the non-conductive core component discharge hole 51'. It is discharged into the polymer component (pod component). On the other hand, the non-conductive 1 [merged component (B) enters from the peripheral polymer section 32 into the peripheral inflow hole 42 of the metal plate section 4, and then from the peripheral discharge hole 52 into the peripheral polymer channel 62 or It enters the outer discharge hole 63. Next, the peripheral polymer channel 6
The non-conductive polymer component (B) in the core component discharge hole 51'
conductive polymer component (compounded with AJ in a core-sheath shape,
It is discharged from the inner discharge hole 62' and becomes a composite fiber. On the other hand, the non-conductive polymer component CB that entered the outer discharge hole 63)
Ii is discharged alone and becomes a single fiber.

After spun the composite #a fiber and the single edge i11 from the same spinneret in this way,
Cooling, applying oil, stretching, etc. are performed to obtain an antistatic mixed fiber yarn, which is then wound.

The mixed fiber yarn obtained in the above-described embodiment consists of two filaments of conductive 11ε composite fibers with conductive polymer as the core component, and eight conductive fibers of non-conductive fibers, which are spun from the outer discharge hole. This is the cause of crosstalk. In other words, if conductive composite fibers and non-conductive fibers are spun from separate spinnerets and mixed, or if they are spun from the right and left halves of the same spinneret and mixed, The uniformity of both fibers in the filament becomes insufficient, resulting in poor high-order processability and self-seating spots. In this way, in order to spin the conductive composite fiber from the inner discharge hole, the conductive polymer component (A
) is supplied to the central inflow hole of the Uj thread nozzle, and the non-conductive polymer component CB'l is supplied to the peripheral inflow hole, and the conductive polymer component (A) and the non-conductive polymer component ( Forming a composite polymer stream with a part of B) is useful for manufacturing spinneret equipment, or for producing antistatic blended yarn with stable spinning properties and no self-seating unevenness, with good spinnability. It can be done. In addition, various single yarn finenesses, composite ratios, mixed fiber ratios, and yarn finenesses can be easily manufactured by changing the spinneret and the amount of each polymer component supplied. It is also possible to easily change the mixed fiber ratio, or to change the composite ratio and form of the conductive 11:composite fiber.

The antistatic mixed fiber yarn obtained by the method of the present invention has no self-seating spots and has good passability through higher processing, so it can be woven together with other yarns as necessary to provide antistatic properties. It can be made of fabric. This antistatic mixed yarn or fabric is
It can be effectively used in a wide range of applications such as dust-free clothing, dust-proof clothing, explosion-proof clothing, lingerie, foundation, underwear, etc.

Next, the method of the present invention will be explained using examples.

- Example 1 As the conductive polymer component (A), sulfuric acid relative viscosity (ηr)
A mixture of nylon 6 polymer with ηr of 2.35 and 35% by weight of conductive carbon black was used as the non-conductive polymer component (B). (containing a total of 8% by weight of titanium dioxide) was used as a disinfectant.The conductive polymer component (A) &-i, 1
It was melted at a cylinder temperature of 280°C using a 5 mm diameter compact extruder type extruder, and fed to the central polymer part of the spinning pack at a feeding rate of 0.12 mm or 0.86'y4> using a metering pump. Na. On the other hand, the non-conductive polymer (B
) was melted in a pressure melter type extruder and fed to the polymer portion on the same side of the spinning bag using a metering pump at a feed rate of 28,884) or 28,64 flaws.

A spinning device as shown in Figures 1 to 6 (rolling, winding, and further stretching speed 220\, stretching temperature 150°C, stretching ratio 3)
The film was stretched 21 times and wound up. The composite ratio (vehicle volume ratio) of composite fiber is (A) / (B) = 5 / 9
5, the single yarn fineness of the obtained composite fiber (X) is 4 denier, the single yarn fineness of the non-conductive fiber (Y) is also 4 denier, and the fineness of the mixed yarn is 40 denier. Fiber (X
) and the number of threads of the non-conductive fiber (Y) is (X)/
(Y) (book) -1/9, level / 16.2? (X) / (Y
) (book) -8/'l.

Table 1 shows the characteristics of a yarn in which all the yarns are composite fibers, with a level of 76, 1-/1fy2, and a ratio of 1 bite.

In addition, for the yarn itself, the cylinder diameter of the yarn is 3+
A tubular knitted fabric is knitted using a total of 320 inches, and Color Machine Co., Ltd.'s Color/j'-meter Color Machine CM-2
Using 0, 1ljll and f (represented by L value).

Table 1 As shown in Table 1, obtained by the method of the present invention, ti, '
li: The blended yarn had good yarn quality and excellent self-resistance as evidenced by the large tubular knit fabric value. In addition, the mixed fiber yarn obtained by the method of the present invention has composite fibers (X) and non-conductive fibers (Y) uniformly arranged in /l.
! Since it is made of fiber, there is no unevenness, and it is also highly processed.
, ``The h nature was strong.Furthermore, the level / 161-4
As can be seen from the fact that there was no significant difference in spinnability in both G2 and Comparison, it was possible to easily and stably produce a mixed yarn with good spinnability using the method of the present invention.

[Brief explanation of the drawing]

FIG. 1 is a schematic diagram of the main parts of the molten I/J yarn process shown in one embodiment of the method of the present invention. Figures 2 to 6 show an embodiment of the spinneret used in the method of the present invention, and Figures 2, 3, and 4 are plan views showing the upper, middle, and lower metal plate portions, respectively. - Figure 6 is a cross-sectional view of the spinneret in the direction of arrows, without showing the V-V cross section and the M--■ cross section in Figures 2 to 4, respectively. [Explanation of symbols] A: Conductive polymer component B: Non-conductive polymer component 1, 1': Melt extrusion means 3: Spinning pad 41: Center inlet hole 42: Around the spinneret Part inflow hole 62: Outer discharge hole 62' of spinneret: Inner discharge hole Y of spinneret: Spinning yarn special printing U\ Toshi Co., Ltd.

Claims (1)

[Claims] A conductive polymer component containing 15 to 50% by weight of conductive carbon black is melted and fed to the central inflow hole of the spinneret, while a fiber-forming non-conductive polymer component is entirely melted. supplying the peripheral inflow hole of the spinneret, forming a composite polymer stream from the conductive polymer component and a portion of the non-conductive polymer component within the spinneret, and discharging it from the inside of the spinneret. All of the conductive composite fibers made of the composite polymer stream are spun from the holes, and at the same time, non-conductive fibers made of the non-conductive polymer are spun from the outer discharge holes of the spinneret, mixed, and then stretched. A method for producing an antistatic mixed yarn characterized by winding it up.