JPS62177208A - Production of composite fiber - Google Patents

Abstract

PURPOSE:To obtain a composite fiber having various properties from single polymer stream, by dividing a molten polymer stream into >=2 streams, introducing a modifier into at least one of the streams, subjecting the streams to quick kneading and metering and joining the streams into a composite fiber. CONSTITUTION:A polymer stream 1 is divided into polymer streams 2, 3. A modifier 4 is metered with a pump 5 and introduced through a valve 6 into the polymer stream 2. The polymer and the modifier are mixed with each other in quick kneader 7, metered with a spinning pump 8, uniformly mixed in a quick kneader 9 and sent to a spinning pack 10. In a kneading block B, a valve 6' is closed to inhibit the intrusion of a modifier 4' and the unmodified polymer stream 3 s introduced into the spinning pack 10. The unmodified stream is joined with the modified polymer stream and spun as a composite fiber 11. When a modifier 4' different from the modifier 4 is to be introduced into one of the polymer, the valve 6' is opened to obtain a composite fiber containing two kinds of modifiers.

Description

[Detailed description of the invention] The present invention relates to a method for manufacturing composite fibers.

Conventionally, methods for producing composite fibers have been made using homogeneous polymers with different viscosities, homogeneous polymers with different contents of ionizable groups,
It is known to jointly spin a single polymer and a copolymer, or different types of polymers, etc. in a parallel type or core-sheath type, and for this reason, it is necessary to prepare each polymer to be joined separately, and the manufacturing process is slow. Since it is necessary to change the brand of composite fiber depending on the purpose of the composite fiber, the equipment becomes complicated and work efficiency decreases. In addition, by dividing one kind of molten polymer stream into two parts and installing a heater in one part to heat and deteriorate the flow, the thermal history of each of the two polymers can be changed, thereby creating a difference in the shrinkability of the two polymers. It has also been proposed to produce fibers with latent shrinkage. However, in such a method, only the thermal history is changed, so the difference in thermal contraction, for example, naturally does not exceed a certain limit, and furthermore, it is not possible to impart antistatic properties, flame retardance, moisture absorption properties, etc. .

The present inventors completed the present invention as a result of intensive research aimed at producing composite fibers having various properties from a single polymer stream.

An object of the present invention is to provide composite fibers having various properties. Another object of the present invention is to provide a method for industrially easily and inexpensively producing composite fibers having various properties using a single device.

The method of the present invention is characterized in that a single molten polymer stream is divided into two or more parts, a modifier is injected into at least one of the parts, and after rapid kneading and quantitative metering, these parts are joined.

Molten polymers applicable to the present invention include nylon 6°, nylon 66, nylon 610. Examples include polyamides which are nylon 1) or their copolymers, polyesters represented by polyethylene terephthalate obtained by condensation polymerization of aromatic dicarboxylic acids and glycols, polyolefins such as polyethylene and polypropylene, and polyurethanes. However, polyesters are particularly preferred in view of the necessity of modification and the ease of modification.

Modifiers that can be used in the present invention include known modifiers, such as dyeability improvers, flame retardant imparters, hygroscopicity improvers, antistatic agents, lubricants, base dyes, matting agents, etc. etc. Specifically, for example, polyethylene oxide, polypropylene oxide, polyethylene oxide-polypropylene oxide copolymer, polyethylene oxide-polyester block copolymer, polyethylene oxide-polyester mixture, cationic dyeable polyester copolymer, polyhydroxyethyl isocinco Melonic acid or its polyethylene glycol terephthalate, polycaprolactone, polybutylene gelicol terephthalate, polyamide, polystyrene, phenolic resin initial condensate,
polyester.

Polyurethane, polyacrylonitrile, polyolefin, polyvinyl chloride, polyvinylidene chloride.

Titanium oxide, lithium fluoride, calcium fluoride, magnesium stearate, cobalt acetate, carbon black,
Pigments, dyes, polydimethylsiloxane, polymethylphenylsiloxane, carbon dioxide gas.

Examples include nitrogen gas and freon gas.

The amount of modifier added to the polymer varies depending on the type of modifier and polymer, the purpose of modification, etc., but is usually 0.5 to 1.
It is about 0% by weight, preferably about 2 to 8% by weight.

In the method of the present invention, a molten polymer stream is divided into two or more parts, a modifier is injected into at least one of the parts, and then rapidly kneaded.
For rapid kneading, kneaders having static kneading elements, such as "Static Mixer" manufactured by Kenix Co., Ltd. and "Rossu ISG-Mixer" manufactured by Tokushu Kikako Co., Ltd., can be used. In order to increase the cross-mixing effect, it is usually preferable to pass the modifier through a rapid kneader after injection, and further to pass through a rapid kneader after passing through a metering pump. In this case, the number of static kneading elements is at least 12, preferably about 20 to 40.

Although the present invention can be applied to ordinary spinning equipment, it is especially advantageous to apply it to a straight-connection/straight-spinning type of spinning equipment, since composite fibers having a wide variety of characteristics can be obtained from a single equipment.

An example of the method of the present invention will be explained below with reference to the drawings.

FIG. 1 is a schematic illustration of the method of the present invention, in which polymer stream 1
is divided into polymer streams 2 and 3, then kneading block A
A modifier 4 is metered into the polymer stream 2 by a pump 5 and injected through a valve 6.

The associated polymer and modifier are mixed in a rapid kneader 7, metered by a spinning pump 8, further uniformly mixed in a rapid kneader 9, and sent to a spinning pack 10. On the other hand, in the kneading block B, the valve 6' is closed so that the modifier 4' is not injected, and the polymer stream 3 reaches the spinning pack 10 without being modified, where it is joined with the modified polymer to form the composite fiber 1). Spun.

Incidentally, when it is desired to inject a modifier 4' different from the modifier 4 into one of the polymers, by opening the valve 6'', a composite fiber containing two types of modifiers can be produced.

Thus, according to the method of the present invention, it is possible to impart at least one of the modifying properties such as easy dyeability, flame retardancy, antistatic property, and hygroscopicity to any fiber-forming polymer. be. Moreover,
Since the modifier is rapidly kneaded into the molten polymer immediately before spinning, there is an advantage that there is very little deterioration in fiber properties due to thermal deterioration of the modifier and/or interaction between the modifier and the molten polymer. . Therefore, in the present invention, a wide range of organic or inorganic compound modifiers can be mixed with the fiber-forming polymer and spun without impairing the physical properties of the fiber-forming polymer.
It is extremely useful in industry.

In particular, in an era where differentiated products are required in recent years, the ability to easily and quickly manufacture a wide variety of products from the same equipment is a manufacturing method with extremely high utility value, considering costs such as equipment and personnel. be.

Hereinafter, the present invention will be specifically explained with reference to Examples.

Example 1 A polymer stream 1 made of polyethylene terephthalate is divided into polymer streams 2 and 3, and a dyeability improver and an antistatic agent are applied as modifiers 4 and 4' of each crosstalk block A and B through valves 6 and 6', respectively. Inject into polymer stream 2.3. Polyethylene glycol with a number average molecular weight of 2.000 is used as a dyeability improver, and ethylene terephthalate oligomer and polyethylene glycol (with a number average molecular weight of 2.000) are used as antistatic agents.
) with a number average molecular weight of 15,000 were used, and 5% by weight of each was added to polyethylene terephthalate.

Rapid kneader 7.7″ and 9.9″ each have 20 elements.
．． The temperature of each of the 12 homogeneously kneaded polymer streams was controlled at 285°C. Polymers from these kneading blocks A and B are added to the spinning bag 1 in a 1:1 ratio.
0, spinning temperature 290℃, spinning speed 800+++/
Using a circular nozzle with 500 holes, the discharge amount is approximately 2.
Joint spinning was carried out in parallel at 65 g/min. Insects during spinning,
There was no yarn breakage at all, and the fineness fluctuation rate of the yarn drawing was still 3.4%. This undrawn yarn was stretched 38 times in hot water at 70°C and heat treated at 130°C, with a fineness of 3.13d and a strength of 4.
．． 06g/d.

The elongation was 47.2%. The dye exhaustion rate and static electricity generation amount of the obtained composite fiber were 80.3% and +1.4KV (3
0°C/25%). Further, no staining spots were found at all.

For comparison, the above physical property values were determined for fibers obtained in exactly the same manner as above except that no modifier was injected, and they were 36.5% and +10.7 KV, respectively.

Incidentally, the dyeing exhaustion rate was measured under the following conditions.

Dye: Miketon Polyester Blue
e P, BL, 3% out bath ratio: 1:30 (
(No carrier) Temperature: 97-98℃ (normal pressure boiling) Time: 60 minutes Also, the amount of static electricity generated is the voltage generated when constant friction is applied to an acrylic plate in an atmosphere of 30℃ and 25% RH. This is the value measured using current collecting static electricity.

Example 2 Hollow composite fibers were produced in the same manner as in Example 1. Number average molecular weight 6,00 as a modifier for kneading block A
0 polyethylene glycol was added in an amount of 5% by weight based on polyethylene terephthalate.

In the crosstalk block B, the pulp 6 was closed and no modifier was added. These polymers were jointly spun in parallel at a spinning temperature of 290° C., a spinning speed of 780 IIl/min, and a ( ) type nozzle with 400 holes at a discharge rate of approximately 390 g/min.

There were no insects or yarn breakage during spinning, and the fiber fluctuation rate of the undrawn yarn was 2.5%. This undrawn yarn was stretched 3.7 times in hot water at 70°C and then heat-treated at 170°C, resulting in a fineness of 6.03. Strength 4.5? , the elongation was 49.4%. The obtained product was cut into 76 dm pieces and carded, and the bulk and performance were not significantly different from futon cotton, which is a hollow composite fiber produced by a known method. However, the method according to the present invention was superior in terms of white discoloration.

[Brief explanation of drawings]

FIG. 1 is a schematic explanatory diagram of the present invention.

Claims (6)

[Claims] (1) A composite fiber characterized in that a single molten polymer flow is divided into two or more parts, a modifier is injected into at least one of them, and then these are joined after rapid kneading and quantitative metering. Manufacturing method. (2) The manufacturing method according to claim 1, wherein the molten polymer is polyamide or polyester. (3) The production method according to claim 1, wherein the molten polymer stream is divided into two parts and a modifier is injected into one of the parts. (4) The manufacturing method according to claim 1, wherein the modifier is a dyeability improver, a flame retardant agent, a hygroscopicity improver, or an antistatic agent. (5) The manufacturing method according to claim 1, wherein the rapid kneading uses a kneader having a static kneading element. (6) The manufacturing method according to claim 1 or 3, wherein the bonding is of a parallel type or a core-sheath type in the cross section of the fibers.