JPH01306609A - Production of nylon-6,6 fiber - Google Patents

Abstract

PURPOSE:To obtain nylon-6,6 fiber with transparent feeling and excellent glossiness suitable as a raw fiber for a carpet, by extruding nylon-6,6 through a spinning nozzle and bringing the spun yarn into contact with a liquid having a specified value or above temperature difference from the temperature of the yarn for cooling. CONSTITUTION:Nylon-6,6 composed of polyhexamethylene adipamide, etc., is extruded through a spinning nozzle 2 at >=4,000m/min and brought into contact with a liquid such as water having >=50 deg.C temperature difference from the temperature of the yarn using a cooling nozzle 5, etc., for cooling. An oil agent is then applied to the resultant yarn and wound by a winder 7 without drawing, thus obtaining the objective fiber.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a method for producing nylon 66 fibers with excellent gloss. More specifically, nylon 66 can provide transparency and excellent gloss when used on carpets, etc.
Concerning fiber manufacturing methods.

[Prior art]

In recent years, nylon 66 fiber has been widely used as yarn for tire cords and carpets.

In order to improve the productivity of nylon 66 fibers and rationalize equipment, we have increased the take-up speed to 40% when manufacturing nylon 66 fibers.
A manufacturing method that operates at a speed of 00 m/min or more has been proposed. JP-A-57-143514 discloses that nylon 66 fibers spun at high speed have excellent level dyeing properties and mechanical properties without being stretched. Further, Japanese Patent Application Laid-Open No. 59-157317 proposes carrying out high-speed spinning using compact equipment.

[Problem that the invention seeks to solve]

However, all of these proposals only show examples of fine denier single yarns with a denier of 2 to 3 deniers.

The present inventors investigated the spinning of single fibers of 5 deniers or more used for tire cords, carpets, etc. by high-speed spinning of nylon 66, and found that all of the fibers obtained were devitrified and only those with poor transparency were produced. It became clear that it was not possible. In particular, when used as yarn for carpets, it is clear that no matter how you choose the cross-sectional shape of the single yarn, you will not be able to obtain a high-class feel because it lacks luster, and if it is used as it is, it will have no commercial value. Became.

Therefore, in high-speed spinning of nylon 66, there has been a strong demand for a method for producing nylon 66 fibers that do not cause devitrification even at large denier fibers and have excellent transparency.

The present inventors have completed the present invention as a result of intensive studies on a high-speed spinning method for nylon 66 fibers that solves these problems.

[Means for solving problems]

That is, the present invention provides the following method: ``When taking a single nylon 66 fiber of 5 denier or more at a spinning speed of 4000 m/min or more, the liquid is catalyzed and cooled to the yarn at a temperature where the temperature difference between the yarn temperature and the liquid is 50°C or more. A method for producing nylon 66 fiber characterized by

In the present invention, nylon 66 consists essentially of polyhexamethylene adipamide (nylon 66), of which 95 mol% or more is hexamethylene adipamide. nylon 6
A small amount of copolymer components such as nylon 6, 610.612, antistatic agent, etc., as long as the heat resistance and mechanical properties of 6 are not impaired.
It may also contain a third component such as a pigment.

The spinning speed in the present invention needs to be 4000 I11/min or more. If the speed is less than 4000 m/min, the mechanical properties of the obtained fibers will be poor and the fibers cannot be put to practical use as they are without being stretched. The preferred spinning speed is 5000m
/min or more, more preferably 5500 m/min or more.

The single yarn denier of the nylon 66 fiber is required to be 5 denier or more. When the denier is less than 5 denier, devitrification, which is a problem in the present invention, hardly occurs. In the present invention, the single yarn denier is further 8
The effect is exhibited at denier or higher. The preferred denier is 8-30 denier.

In the present invention, it is important to cool the fibers during spinning by bringing the liquid into contact with the fibers at a temperature such that the temperature difference between the tea temperature and the liquid is 50° C. or more. As the liquid used for contact and cooling, water or an oil agent used in ordinary spinning is employed. Water is conveniently used. The temperature difference between the yarn temperature of the fiber during spinning and the liquid must be 50° C. or more. If the temperature is less than 50°C, the effects of the present invention cannot be obtained. The yarn temperature when contacting with the liquid of the present invention is not particularly limited, but is preferably 50°C to 150°C.

The temperature of the liquid is preferably 0°C to 80°C. In a more preferred embodiment, when the yarn temperature is 80°C to 150°C, it is desirable to contact the liquid with a liquid at 0°C to 40°C to cool the yarn. Usually water at 20°C to 30°C is used.

The method of applying such a liquid is achieved by directly contacting the thread as a fluid with a liquid supply nozzle or a roll, or by contacting the thread with the liquid in the form of mist from a nozzle.

FIG. 3 illustrates an example of an apparatus for carrying out the manufacturing method of the present invention. In FIG. 3, fibers 8 extruded from a spinneret 2 attached to a spinning head 1 pass through a heat-insulating cylinder 3 provided under the spinneret, and are cooled by a cooling chamber 4 while passing through a cooling nozzle 5. The film is brought into contact with and cooled by a liquid, and after being applied with a lubricant by a lubricating nozzle 6, it is wound up by a winding machine 7 without being stretched.

The effects of the nylon 66 fibers obtained by the method of the present invention can be clearly observed using an electron microscope.

FIG. 1 is an electron micrograph showing a side view of nylon 66 fiber obtained by the method of the present invention.

FIG. 2 is a photograph obtained by the conventional method.

As is clear from the photograph, the conventional nylon 66 fiber has many uneven grooves on its surface along the fiber axis direction. In contrast, the fiber surface of the present invention is smooth.

[Effect]

The nylon 66 fibers obtained by the production method of the present invention have excellent transparency, and especially those made into irregular cross-section yarns exhibit excellent gloss. Items that have been subjected to normal crimping, etc.
Suitable for yarn for carpets.

〔Example〕 The present invention will be explained below with reference to Examples.

Each measurement was performed using the following method.

(b) Yarn temperature Using an infrared radiation thermometer, the yarn temperature was measured at each point along the spinning line in a non-contact manner.

(b) The unevenness of the fiber surface was measured by taking a photograph of the surface of the fiber using a scanning electron microscope at a magnification of 2000 times using a conventional method.

(c), gloss The presence or absence of gloss was determined with the naked eye.

Example 1 Relative viscosity ηrel = 2.6 (95% 1hsOn,
Nylon 66 consisting essentially of polyhexamethylene cyasivamide (measured in a 1% solution) was spun at a spinning temperature of 295
The material was extruded at °C through a spinneret with a hole diameter of 0.35 mm and 6 holes, and spun and taken off as 60 denier.

A non-heated heat-insulating cylinder with a length of 20 cm was provided at the bottom of the spinneret. It was cooled with cold air at 20°C and 0.3 m/sec from a cold air chamber.

The fibers being spun were brought into contact with water at 20° C. using a nozzle guide and cooled. Table 1 shows the spinning take-off speed, the contact position of water at each speed, the yarn temperature, the transparency of the obtained fibers, and the presence or absence of unevenness on the fiber surface as determined by an electron microscope.

Table 1 Irregularities on the fiber surface None: ○ With: × Gloss
Yes: O No: × Example 2 In Example 1, the spinning take-off speed was kept constant at 7000 m/min, the single yarn denier of the fiber was varied as shown in Table 2, and the yarn was cooled by contacting with water. did.

Table 2 shows the effect of cooling at each denier.

Table 2 4, Explanation of Drawings FIG. 1 is an electron micrograph of the nylon 66 fiber obtained in the present invention.

FIG. 2 is an electron micrograph of nylon 66 fibers obtained by a conventional method.

FIG. 3 schematically shows an example of a spinning apparatus for implementing the present invention.

In FIG. 3, the names of each number are as follows.

1-Spinning head, 2-Spinneret, 3-Heating cylinder, 4-Cooling chamber, 5...
・Liquid application nozzle, 6-...'4o Oil/nozzle, 7-
- Winder, 8-Fiber.

Patent Applicant: Asahi Kasei Kogyo Co., Ltd.
3 diagram

Claims (1)

[Claims] Spinning nylon 66 fiber with a single yarn of 5 denier or more at a speed of 40
A method for producing nylon 66 fiber, characterized by bringing a liquid into contact with the yarn and cooling it at a temperature such that the temperature difference between the yarn temperature and the liquid is 50°C or more when the yarn is taken at a speed of 00 m/min or more.