JP2002030518A - Method for producing polyolefin extra fine filament - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain a polyolefin extra fine filament which is obtained by using a polyolefin and has <=1.1 dtex single filament fineness, further a spun-dyed polyolefin extra fine filament. SOLUTION: A polyolefin having 50-300 g/10 minutes melt flow rate value is spun at 180-240 deg.C spinning head temperature by a spinneret having <=1.2 mm spinning hole diameter, then drawn at 2-7 times draw ratio at 50-90 deg.C draw temperature to give a polyolefin extra fine filament having <=1.1 single fiber fineness and >=2.6 cN/dtex filament strength.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for producing a polyolefin ultrafine filament.

[0002]

2. Description of the Related Art Conventionally, as a method of obtaining ultrafine fibers of polyolefin, a sea-island structure fiber is formed by using a polymer such as polyester or polyamide which is dissolvable and removable.
A method for dissolving and removing a dissolvable polymer is disclosed in
-30921, JP-A-54-125789, JP-A-54-147268, JP-A-56-1
No. 18925, JP-A-56-118962,
Japanese Patent Application Laid-Open No. 56-128366 discloses a method in which a polymer such as incompatible polyester or polyamide is used in combination to form a peelable conjugate fiber, and then the incompatible polymer is peeled off by external force or the like. JP-A-57-21532, JP-A-57-77351, JP-A-3-260
No. 169, etc., this not only complicates the manufacturing process, but also requires solvent recovery and further disposal of the collected or stripped material. Great care must be taken not to generate any objects.

[0003] As a method without such a problem in production, as a method for obtaining ultrafine fibers directly from polyolefin, a polyolefin is spun at a low discharge rate per spinning hole of a spinneret, and is wound at a high speed. A method of stretching at a high magnification is known. However, if the discharge amount is reduced, discharge distribution unevenness occurs between the spinning holes, the spinning property is deteriorated, and as the winding speed increases, the draw ratio that can be drawn decreases, the single fiber fineness increases, and the The ultrafine fibers to be obtained have a single fiber fineness of 1.11 dtex.

[0004]

DISCLOSURE OF THE INVENTION The present invention has been made as a result of using polyolefin, a resin that does not generate any harmful substances even when incinerated, to obtain ultrafine filaments. An object of the present invention is to obtain a polyolefin ultrafine long fiber having a single fiber fineness of 1.1 dtex or less using a polyolefin, and further to obtain an original polyolefin ultrafine long fiber.

[0005]

SUMMARY OF THE INVENTION The present invention relates to a spinning head having a melt flow rate of 50 to 300 g / 10 minutes or a polyolefin containing 0.01 to 6% by weight of a pigment at a spinning head temperature of 180 to 240.degree. Spinning is performed with a spinneret having a hole diameter of 1.2 mm or less, and then a draw ratio of 2 to 7 times and a draw temperature of 5
The single fiber fineness obtained by stretching at 0 to 90 ° C. is 1.1 dtex or less, and the fiber strength is 2.6 cN / dtex.
The above is a method for producing a polyolefin ultrafine long fiber.

[0006]

BEST MODE FOR CARRYING OUT THE INVENTION The polyolefin in the polyolefin ultrafine long fiber of the present invention includes polyethylene, polypropylene and the like, and is not particularly limited. High polypropylene is mentioned as preferred. The polypropylene preferably used may be a homopolymer of propylene or a meltable copolymer of propylene and another α-olefin monomer, for example, a monomer such as ethylene or bitene-1.

Particularly, when producing the polyolefin ultrafine long fiber of the present invention, the melt flow rate (hereinafter abbreviated as MFR) value is 50 to 300 g / 10 min, preferably 100 to 300 g / 10 min.
240 g / 10 min polyolefin is used. This MF
The R value is based on JIS K-7210 and the test temperature is 23
It is a measured value under the measurement conditions of 0 ° C. and a test load of 2.16 kg. When the MFR value is less than 50 g / 10 minutes, it is difficult to obtain a long fiber per se having a single fiber fineness of 1.1 dtex or less because it is difficult to uniformly thin the fiber during the production of the fiber, thereby deteriorating the spinnability. If it exceeds 300 g / 10 minutes, the high fluidity of the polymer during fiber production deteriorates the spinnability and makes it difficult to secure fiber strength.

When the polyolefin ultrafine filament of the present invention is produced, the polyolefin constituting the ultrafine filament has an MFR value of 50 to 300 g / 10 min, preferably 100 to 240 g / 10 min, and a pigment of 0 to 300 g / 10 min. It is preferable to use a polyolefin containing 0.16 to 6% by weight, preferably 0.5 to 4% by weight, and the polyolefin ultrafine long fiber is composed of a polyolefin containing a pigment. This is a high-density fiber. If the pigment content is less than 0.01% by weight, the color developability is insufficient, and if it exceeds 6% by weight, the spinning property during fiber production deteriorates, and it is difficult to draw at a high magnification, and the single fiber fineness is 1. It is difficult to obtain long fibers themselves of 1 dtex or less.

The ultrafine polyolefin long fiber according to the present invention has a single fiber fineness of 1.1 dtex or less, and
It has a fiber strength of 2.6 cN / dtex or more, and is useful as a fabric material such as a woven fabric, a knitted fabric, or a nonwoven fabric, particularly a suede-like fabric material, and has a fiber strength of 2.6 cN / dtex.
If the dtex is less than dtex, the use is restricted and the material is easily cut, and phenomena such as thread breakage and fluff dropping occur. Moreover, the cross-sectional shape of the ultrafine polyolefin long fiber according to the present invention may be any shape such as a circular cross-section, a hollow cross-section, and a triangular cross-section. The polyolefin used in the present invention has a composition of 2.6.
Addition of antioxidants, heat stabilizers, light stabilizers, ultraviolet absorbers, fluorescent brighteners, matting agents, antistatic agents, flame retardants, antibacterial agents, etc. within a range that maintains the fiber strength of cN / dtex or more An agent may be included.

In the production of the ultrafine filamentous polyolefin fiber of the present invention, a polyolefin having an MFR value of 50 to 300 g / 10 min, preferably polypropylene, is prepared by mixing a spin head temperature of 180 to
Melt spinning is performed at 240 ° C. using a spinneret having a spinning hole diameter of 1.2 mm or less, and then a draw ratio is 2 to 7 times, preferably 2 to 5 times.
The stretching is performed by stretching at a temperature of 50 to 90 ° C. If the spinning head temperature is less than 180 ° C., sufficient fluidity cannot be obtained in the molten polymer, and if it exceeds 240 ° C., the discharged spun fibers are insufficiently cooled and adhesion between single fibers is likely to occur. When the spinning hole diameter exceeds 1.2 mm, unevenness in the discharge amount is apt to occur, resulting in poor spinnability. The winding speed after the melt spinning is set to 400 to 3000 m / min.
If it is less than 0 m / min, it is necessary to set the ejection amount low,
The discharge amount unevenness easily occurs between the spinning holes, and high-magnification stretching cannot be performed.
If it exceeds 0 m / min, high magnification stretching cannot be performed and 1.1 dte
It is difficult to reduce the thickness to x or less.

In the production of the ultrafine filaments of the present invention, a polyolefin containing 0.01 to 6% by weight of a pigment and having an MFR of 50 to 300 g / 10 minutes is used. The pigment may be added directly, but a pigment is added at a high concentration to a polyolefin having an MFR value of 50 to 300 g / 10 minutes to obtain a pigment-containing polyolefin called a master batch. 300 g / 10 min, and the MFR value difference from the master batch polyolefin is 150 g / 10 min or less, more preferably 120 g / min.
It may be added by a method of diluting with a pigment-free polyolefin of 10 minutes or less so as to have a predetermined pigment content.

[0012] In the drawing after spinning, if the draw ratio is less than 2 times, a fiber strength of 2.6 cN / dtex or more cannot be obtained, and the elongation becomes extremely high.
The spinnability deteriorates. If the stretching temperature is lower than 50 ° C., high-stretching cannot be performed and a fiber strength of 2.6 cN / dtex or more cannot be obtained, and the yarn production stability also deteriorates. If it exceeds 90 ° C., the yarn production stability deteriorates. After stretching, the temperature is 60 to 140
The heat setting is preferably performed at a temperature of 0 ° C., and the heat setting may be any of a hot plate method and a heat roller method. If the heat setting temperature is lower than 60 ° C., shrinkage remains, and dimensional stability of the product is lacking. If the heat setting temperature exceeds 140 ° C., the spinnability deteriorates.

[0013]

The present invention will be described below in more detail with reference to examples.

Example 1 MFR was used as a polymer.
Using a polypropylene having a value of 130 g / min and a melting point of 162 ° C., spinning is performed by a melt extruder from a spinneret having an extruder temperature of 200 ° C., a spinning head temperature of 195 ° C., and 144 circular spinning holes having a hole diameter of 0.8 mm. Then, it was wound at a take-up speed of 900 m / min. Next, the stretching ratio is 2.945 times, and the stretching temperature is 80.
At a heat setting temperature of 135 ° C., and 114.4 ° C.
dtex / 144 filament (single fiber fineness 0.79d
tex) was obtained. The obtained ultrafine long fiber yarn had good spinnability, and the physical properties of the yarn are shown in Table 1.

Example 2 The polymer used was MFR
The spinning and drawing were performed under the same conditions as in Example 1 except that the value was 220 g / min, the melting point was 162 ° C., the number of circular spinning holes was changed to 192, and the draw ratio was changed to 3.05 times. / 192 filaments (single fiber fineness: 0.69 dtex) were obtained. The obtained ultrafine long fiber yarn had good spinnability, and the physical properties of the yarn are shown in Table 1.

(Example 3) Polypropylene having a pigment (cyanine green) content of 20% by weight, an MFR value of 160 g / min and a melting point of 162 ° C. was used as a polymer.
The polymer was spun and stretched under the same conditions as in Example 1 except that a polymer diluted with a polypropylene having an FR value of 220 g / min and a melting point of 162 ° C. at a dilution ratio of 30 times was used, and was spun and stretched to 114.4.
dtex / 144 filament (single fiber fineness 0.79d
tex) was obtained. The obtained spun ultrafine long fiber yarn had good spinnability, a pigment content of 0.67% by weight, and the yarn physical properties are shown in Table 1.

Example 4 The polymer used was MFR
Using a polypropylene having a value of 50 g / min and a melting point of 162 ° C., a melt extruder is used to spin from a spinneret equipped with 72 circular spinning holes having an extruder temperature of 220 ° C., a spinning head temperature of 215 ° C., and a hole diameter of 0.8 mm. Then, it was wound at a take-up speed of 900 m / min. Next, the film is stretched under the conditions of a stretching ratio of 2.54, a stretching temperature of 80 ° C., and a heat setting temperature of 135 ° C., and 78.3 dtex.
An ultra-fine long fiber yarn of / 72 filaments (single fiber fineness: 0.98 dtex) was obtained. The obtained ultrafine long fiber yarn had good spinnability, and the physical properties of the yarn are shown in Table 1.

Comparative Example 1 The polymer used was MFR
Using a polypropylene having a value of 30 g / min and a melting point of 162 ° C., a melt extruder is used to spin from a spinneret equipped with 72 circular spinning holes having an extruder temperature of 230 ° C., a spinning head temperature of 220 ° C., and a hole diameter of 0.8 mm. Then, it was wound at a take-up speed of 900 m / min. Next, the film was stretched under the conditions of a stretching ratio of 2.32 times, a stretching temperature of 80 ° C., and a heat setting temperature of 135 ° C., and 83.6 dtex.
A long fiber yarn of / 72 filament (single fiber fineness: 1.16 dtex) was obtained. Table 1 shows the physical properties of the obtained long fiber yarn.

Comparative Example 2 As a polymer to be used, MFR was used.
Using a polypropylene having a value of 30 g / min and a melting point of 162 ° C., the extruder temperature was set to 220 ° C.
C., the second zone was 230.degree. C., the third zone was 250.degree. C., and the spinning head temperature was 250.degree. C., but the spinning was attempted under the same conditions as in Comparative Example 1. Did not.

[0020]

[Table 1]

Example 5 As a polymer to be used, polypropylene having a pigment (cyanine green) content of 20% by weight, an MFR value of 103 g / min and a melting point of 162 ° C. was used.
Circular spinning with an extruder temperature of 200 ° C., a spinning head temperature of 195 ° C., and a hole diameter of 0.8 mm, using a polymer extruded at a melt extruder with a FR value of 200 g / min and a polymer diluted by a factor of 6 with polypropylene having a melting point of 162 ° C. The fiber was spun from a spinneret having 144 holes and wound up at a take-up speed of 900 m / min. Next, the film is stretched under the conditions of a stretch ratio of 3.20 times, a stretching temperature of 80 ° C., and a heat setting temperature of 135 ° C., and 105.2 dtex / 144.
An original ultrafine long fiber yarn having a filament (single fiber fineness of 0.73 dtex) was obtained with good spinning stability. The obtained pigmented ultrafine long fiber yarn has a pigment content of 3.33% by weight, and the yarn physical properties are as follows: fiber strength: 4.18 cN / dtex, elongation: 28.5.
%Met.

[0022]

The polyolefin ultrafine filament according to the present invention is
Since it is composed of only polyolefin and is also an ultrafine filament as a raw fiber, it is useful as a fabric material such as a woven fabric, a knitted fabric, and a nonwoven fabric, particularly a suede-like fabric material, and is used in a garment field, an industrial material field, and the like. It can be preferably used. Further, the polyolefin ultrafine long fiber of the present invention,
By being composed of a polyolefin that does not generate harmful substances such as gas when incinerated during disposal, disposal is facilitated.

 ────────────────────────────────────────────────── ─── Continuing on the front page (72) Inventor Hideo Sakakura 4-1-1 Ushikawa-dori, Toyohashi-shi, Aichi F-term (reference) at Toyohashi Works, Mitsubishi Rayon Co., Ltd. 4L035 BB31 DD13 FF01 GG03 JJ28 LA01

Claims (4)

[Claims] 1. A melt flow rate value of 50 to 300 g
/ 10 min polyolefin spinning head temperature 180-240
The fiber is spun with a spinneret having a spinning hole diameter of 1.2 mm or less and then stretched at a stretching ratio of 2 to 7 times at a stretching temperature of 50 to 90 ° C.
Hereinafter, a method for producing a polyolefin ultrafine long fiber having a fiber strength of 2.6 cN / dtex or more. 2. A polyolefin having a pigment content of 0.01%.
The method for producing a polyolefin ultrafine filament according to claim 1, wherein a polyolefin containing from 6 to 6% by weight is used. 3. The fine polyolefin according to claim 2, wherein the polyolefin is a polyolefin obtained by diluting a pigment-containing polyolefin with a pigment-free polyolefin having a melt flow rate difference of 150 g / 10 minutes or less from the pigment-containing polyolefin. Manufacturing method of long fiber. 4. The process for producing a polyolefin ultrafine long fiber according to claim 1, wherein polypropylene is used as the polyolefin.