JP4081338B2 - Polypropylene-based fluid disturbed fiber and method for producing the same - Google Patents

Description

【００１９】
【発明の効果】
以上説明したように、本発明によれば、芯糸成分としてポリプロピレン捲縮糸と、花糸成分としてポリプロピレンマルチフィラメント糸とを流体撹乱加工した後、乾熱処理を施すことによって、捲縮率が１０％以上の繊維が提供される。かかる繊維は、軽量でソフト感に優れ、且つ、ストレッチバック性が高いという従来の繊維を超える特性を備えている。また、当該繊維を、２色以上の原着繊維とすることで更に高級感のあるストレッチバック性を有する繊維が得られる。さらに、当該繊維はリサイクル性、メンテナンス性にも優れている。したがって、本発明の流体撹乱加工繊維は特に産業資材用途に向けた繊維として極めて有用なものである。[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a polypropylene-based fluid-disturbed processed fiber, a method for producing the same, and a woven or knitted fabric that are lightweight, excellent in softness, and high in stretch back property.
[0002]
[Prior art]
Conventionally, the air disturbance processing method is widely used for the fluid disturbance processing thread | yarn of a synthetic fiber. In this method, it is possible to obtain an eyelash-finished processed yarn and a processed yarn having a soft feeling, but on the other hand, there is a drawback that the stretch back property is poor as a woven knitted fabric, and its usage is limited. As a method for producing a fluid disturbed yarn for producing a woven fabric or a knitted fabric, an air fluid disturbing processing method using two or more fibers is in the spotlight. Various types of air fluid disturbed yarn have been devised.
For example, in Japanese Patent Application Laid-Open Nos. 08-170248, 11-181642 and 2000-129548, a latent crimped yarn made of a polyester-based mixed yarn is used as a core component, and another multifilament is used as a flower component. And polyester blended yarn by taslan processing and woven or knitted fabric thereof. However, the technologies described in these publications are insufficient in recyclability or maintainability when used as industrial materials.
[0003]
[Problems to be solved by the invention]
Under the background as described above, the present invention develops a polypropylene-based fluid-disturbed processed fiber that has an eyelash tone and a soft feeling, has a high stretch back property, and is excellent in recyclability and maintainability as an industrial material application. There is.
[0004]
[Means for Solving the Problems]
As a result of advancing earnest research to solve the above-mentioned problems, the inventors of the present invention performed dry heat treatment on a fiber that has been subjected to fluid disturbance processing as a core component and a flower component in combination with a specific polypropylene-based fiber yarn. We have succeeded in developing a polypropylene-based fluid-disturbed processed fiber that has a soft feeling and excellent stretch back property.
That is, the first gist of the present invention is that an ethylene-propylene random copolymer having a core component having an ethylene copolymerization amount of 2 to 5 mol% and a melt flow rate value of 10 to 50 g / 10 min is parallel to a polypropylene homopolymer. A fluid-disturbed processed fiber composed of a composite polypropylene-based crimped yarn and a flower component composed of a polypropylene-based multifilament yarn, and having a crimp rate of 10% or more after dry heat treatment at 110 ° C. for 5 minutes. The present invention is a polypropylene-based fluid-disturbed processed fiber.
The second gist of the present invention is that an ethylene-propylene random copolymer having a copolymerization amount of 2 to 5 mol% as a core component and a melt flow rate value of 10 to 50 g / 10 min is parallel to a polypropylene homopolymer. After the composite polypropylene crimped yarn and the multifilament yarn serving as a flower component are subjected to fluid disturbance processing, the obtained processed fiber is subjected to a dry heat treatment at a temperature of 110 ° C. or more, and the crimp rate is 10%. It exists in the manufacturing method of the above polypropylene-type fluid disturbance processed fiber.
[0005]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, the present invention will be described in detail.
The crimped fiber constituting the core component of the present invention may be any of false twisted yarn, BCF processed yarn, parallel type composite spun fiber, etc., and is not particularly limited, but preferably before being inserted into the air fluid disturbance nozzle. Uses a composite spun fiber in which a high-shrinkage polypropylene-based resin and a low-shrinkage polypropylene-based resin with little occurrence of crimp are arranged in parallel. Examples of the highly shrinkable polypropylene resin used for such a composite spun fiber include an ethylene-propylene random copolymer obtained using a metallocene polymerization catalyst. On the other hand, as a polypropylene resin for a polypropylene multifilament of a flower component, in addition to a propylene homopolymer, a copolymer of propylene and another α-olefin monomer such as ethylene, butene-1, etc. may be used, and its melting point is 155 ° C. to It is in the range of 170 ° C. and is selected from polymers that can be melt-spun.
[0006]
As the above-mentioned parallel type composite fiber, one of the resins is an ethylene-propylene random copolymer having an ethylene copolymerization amount of 2 to 5 mol% and an MFR value of 10 to 50 g / 10 min obtained using a metallocene polymerization catalyst. The other resin is made of a polypropylene homopolymer. If the ethylene copolymerization amount is less than 2 mol%, the crimped rate after dry heat-treating the processed fiber intended by the present invention cannot be ensured, and the stretch-back property as the crimped fiber is lowered. When the copolymerization amount exceeds 5 mol%, the shrinkage rate becomes too high, and the spinnability and stretchability are remarkably lowered.
As for the MFR value, it is preferable from the viewpoint of spinnability to use a combination of resins having similar MFR values.
[0007]
The core component constituting the polypropylene-based fluid disturbed fiber having stretch back properties of the present invention is melt-spun by a composite melt spinning method. At this time, in order to stabilize the spinnability at the time of composite melt spinning, the maximum stretch of each unstretched fiber of the low shrinkage component polypropylene resin and the high shrinkage component polypropylene resin which are two kinds of composite components It is preferable to make the magnifications comparable, and it is desirable to select the fluidity of the high-shrinkage component and the low-shrinkage component to be comparable.
In order to make the above-mentioned fluidity comparable, in the low shrinkage component polypropylene resin, MFR (based on JIS K-7210, measurement conditions; test temperature 230 ° C., test load 2.16 kg) is 10 to 50 g / The range is preferably 10 minutes, and more preferably 20 to 40 g / 10 minutes.
[0008]
Further, in the high shrinkage component polypropylene-based resin, it is desirable that the MFR value is in the range of 10 to 50 g / 10 min, and the resin in the range of 20 to 40 g / 10 min is more preferable. In order to stabilize the spinnability, it is desirable to use a combination of resins having the same MFR value for the high shrinkage component and the low shrinkage component. If the MFR value of both components is less than 10 g / 10 min, it is necessary to set the spinning temperature at the time of melt spinning high. On the other hand, if it exceeds 50 g / 10 min, the fiber strength of the obtained crimped yarn will decrease. In any case, the spinnability deteriorates, which is not preferable.
[0009]
On the other hand, in the polypropylene resin used for the flower component (polypropylene-based multifilament yarn), the MFR value is preferably in the range of 10 to 50 g / 10 minutes, and more preferably in the range of 20 to 40 g / 10 minutes. . Even if the MFR value is less than 10 g / 10 min or exceeds 50 g / 10 min, the spinnability is deteriorated, which is not preferable.
The spinning temperature of the flower component is usually in the range of 210 to 250 ° C. When the spinning temperature is lower than 210 ° C., only low-strength fibers can be obtained even when a polypropylene resin having an MFR value of 50 g / 10 min is used, and when the spinning temperature is higher than 250 ° C., coloring pigments added to the polyolefin resin are difficult. The flame retardant changes and causes coloring or discoloration.
In the present invention, the fiber can be formed by a so-called direct spinning drawing method such as SDW for continuously drawing the melt-spun fiber without winding the melt-spun undrawn yarn.
[0010]
In the present invention, it is important to make the length of the polypropylene multifilament yarn of the flower component 10% or more longer than the length of the polypropylene-based crimped yarn of the core component, and the upper limit is 80%. To the extent. If the yarn length difference exceeds 80%, the yarn becomes hard and the texture tends to be lowered. If it is less than 10%, the desired properties of the fluid-disturbed processed fiber cannot be obtained.
The fineness of the polypropylene-based parallel-type composite spun fiber used for the core component of the polypropylene-based fluid-disturbed processed yarn having stretch-back properties of the present invention and the polypropylene fiber used for the flower component is not particularly limited, Any fineness may be used.
The fiber cross-sectional shape of the flower component may be a circular core-sheath structure, a hollow core-sheath structure, or a deformed core-sheath structure such as a triangular core-sheath structure, as long as the predetermined polypropylene homopolymer or copolymer is the same component. It may be a structure. When these core-sheath structures are adopted, yarns are produced by a composite spinning method.
Further, the mixing ratio of the core component and the flower component may be an arbitrary ratio. Regarding the form of the yarn, the polypropylene-based fluid disturbed yarn having stretch-back property according to the present invention is preferably a multifilament yarn from the viewpoint of strength when woven or knitted and softness of the fabric.
[0011]
Furthermore, it is considered that the same effect can be obtained even with a spun yarn of a stable. It is preferable that one or both of the core component and the flower component are original fibers. By using original yarns of different colors as the core component and the flower component, a fluid disturbed processed fiber having a higher quality can be obtained. The polypropylene-based fluid disturbed fiber of the present invention having the above-described properties is obtained by subjecting a crimped yarn as a core component and a polypropylene multifilament yarn as a flower component to fluid disturb processing, and then obtaining the processed fiber at 110 ° C. It can be obtained by performing a dry heat treatment at the above temperature. The dry heat treatment temperature is preferably 110 ° C to 130 ° C. The processing time is 5 to 10 minutes.
In the fiber of the present invention, an antioxidant, a heat stabilizer, a light stabilizer, an ultraviolet absorber, a neutralizer, a dispersant, a fluorescent whitening agent, a matting agent, and a lubricant are used as long as the characteristics are not impaired. An antistatic agent, an antibacterial agent, a flame retardant and the like are appropriately blended depending on the purpose.
[0012]
【Example】
Next, the present invention will be described in more detail with reference to examples.
[Production of polypropylene fiber (component A yarn)]
Low melting point ethylene-manufactured by Nippon Polychem Co., Ltd. obtained from a metallocene polymerization catalyst having an ethylene copolymerization amount of 2.5 mol%, an MFR value of 25 g / 10 min, and a melting point of 125 ° C. Propylene random copolymer resin winch “XK1183” and polypropylene homopolymer resin having an MFR value of 31 g / 10 min and a melting point of 163 ° C., and an ethylene-propylene random copolymer resin extruder temperature of 220 ° C., polypropylene homopolymer The resin extruder temperature was adjusted to 225 ° C and the spinning head temperature was adjusted to 220 ° C. Using a melt compound spinning machine, spinning was performed from a spinneret of a circular 30 hole with a hole diameter of 0.8 mm and wound at a take-up speed of 500 m / min. I took it. Further, the unstretched fiber was stretched at a stretch ratio of 4.25 times and a stretching temperature of 80 ° C., and then heat-treated at a temperature of 110 ° C. to produce a 100T30f polypropylene-based parallel composite spun fiber (hereinafter abbreviated as A component yarn). Obtained.
[0013]
[Production of polypropylene fiber (component B yarn)]
In addition, as a flower component, a polypropylene homopolymer having an MFR value of 31 g / 10 min and a melting point of 163 ° C. is used as a raw material, an extruder temperature is adjusted to 225 ° C., a spinning head temperature is adjusted to 220 ° C., and a melt compound spinning machine is used. Then, it was spun from a spinneret of a circular 30 hole having a hole diameter of 0.8 mm and wound at a take-up speed of 500 m / min. Further, this unstretched fiber was stretched at a stretching ratio of 3.30 times and a stretching temperature of 80 ° C., and heat treated at a temperature of 120 ° C. to obtain 190T60f polypropylene fiber (hereinafter abbreviated as B component yarn).
[0014]
<Stretchback test method for fibers>
[Measurement method]
The fluid-disturbed processed fibers obtained in each of the examples and comparative examples are bundled into a husk shape, which is subjected to a dry heat treatment at 110 ° C. for 5 minutes, and then left for 10 minutes or more to obtain a sample yarn.
A) A measurement load A is applied to one end of the sample yarn, and the yarn length (L1) is measured after 1 minute.
Measurement load A = dtex × 1/10 × (2 × number of windings)
After the measurement, the measurement load A is removed and left for 2 minutes.
B) Next, the measurement load B is applied to one end of the sample yarn, and the yarn length (L2) is measured after 1 minute.
Measurement load B = dtex × 1/1000 × (2 × number of windings)
The numerical value calculated by the following formula from the measured values (L1, L2) of the above a) and b) was taken as the stretch back rate.
Crimp rate (%) = [(L1-L2) / L1] × 100
[0015]
[Examples 1 to 3]
Using an air fluid disturbance nozzle (Hebaline Inc .: Hemajet LB-12L + Jetcore S345K), the above-mentioned parallel-type composite spun fiber (A component yarn) composed of an ethylene random copolymer and a polypropylene homopolymer as a core component, While using polypropylene multifilament fiber (component B yarn) as a flower component, air fluid is supplied while the core component is supplied in excess of 15%, 20%, and 30% from the flower component under conditions of a speed of 200 m / min and an air pressure of 0.53 MPa. Disturbed. After heat treating for 5 minutes in the atmosphere of the fiber fineness of the obtained fluid-disturbed processed fiber and dry heat temperatures of 110 ° C. and 120 ° C., the stretch-back rate was determined by the above measurement method. The results are shown in Table 1. The stretch back rate after heat treatment at 120 ° C. showed a high value of 25% or more.
[0016]
[Example 4]
A fluid disturbed fiber was obtained under the same conditions as in Example 1 except that the fluid disturbing speed was changed to 400 m / min. After heat treating for 5 minutes in the atmosphere of the fiber fineness of the obtained fluid disturbance processed fiber and dry heat temperature 110 degreeC and 120 degreeC, the stretch-back rate was calculated | required by the said measuring method. The results are shown in Table 1. The stretch back rate after heat treatment at 120 ° C. was a high value of 25% for the fiber of this example.
[0017]
[Comparative Examples 1-3]
Fluid disturbed fibers were obtained under the same conditions as in Examples 1 to 3, except that the core component was changed to the B component yarn. The fiber fineness of the obtained fluid-disturbed processed fiber, and heat treatment for 5 minutes in an atmosphere of a dry heat temperature of 110 ° C. and 120 ° C., and then a stretch back rate was obtained in the same manner. The results are shown in Table 1. The stretch back rate of the fibers of this comparative example was 1.2% or less.
[0018]
[Table 1]

[0019]
【The invention's effect】
As described above, according to the present invention, a polypropylene crimped yarn as a core yarn component and a polypropylene multifilament yarn as a flower yarn component are subjected to fluid disturbance processing and then subjected to a dry heat treatment, whereby a crimp rate of 10 is achieved. % Fiber is provided. Such a fiber is light and excellent in soft feeling, and has characteristics exceeding conventional fibers such as high stretch back property. Moreover, the fiber which has a stretch back property with a further high-class feeling is obtained by making the said fiber into the original fiber of 2 or more colors. Furthermore, the fiber is excellent in recyclability and maintainability. Therefore, the fluid-disturbed processed fiber of the present invention is extremely useful as a fiber particularly for industrial materials.

Claims (5)

The core component consists of a polypropylene crimped yarn in which an ethylene-propylene random copolymer having an ethylene copolymerization amount of 2 to 5 mol% and a melt flow rate value of 10 to 50 g / 10 min and a polypropylene homopolymer are combined in parallel. A polypropylene-based fluid-disturbed processed fiber, wherein the component is a fluid-disturbed processed fiber composed of a polypropylene-based multifilament yarn, and the crimp rate after dry heat treatment at 110 ° C. for 5 minutes is 10% or more. The polypropylene-based fluid disturbed fiber according to claim 1, wherein the length of the polypropylene multifilament yarn of the flower component is 10% or more longer than the length of the polypropylene crimped yarn of the core component. The polypropylene-based fluid-disturbed processed fiber according to claim 1 or 2, wherein the polypropylene-based multifilament yarn of the flower component comprises a polypropylene-based fiber having a melt flow rate value of 10 to 50 g / 10 min. A polypropylene crimped yarn in which an ethylene-propylene random copolymer and a polypropylene homopolymer having an ethylene copolymerization amount of 2 to 5 mol% as a core component and a melt flow rate value of 10 to 50 g / 10 min are combined in parallel, and a flower component A process for producing a polypropylene-based fluid-disturbed processed fiber having a crimp rate of 10% or more, characterized by subjecting the multifilament yarn to be fluid-disturbed to a dry heat treatment at a temperature of 110 ° C. or higher. . A woven or knitted fabric using the polypropylene-based fluid disturbed fiber according to any one of claims 1 to 3.