JP2002069821A - Method for producing filament nonwoven fabric for artificial leather - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a filament nonwoven fabric for artificial leather having natural leather-like softness and drape and excellent in mechanical strength, by an inexpensive needle-punch interlacing method correspondable to various uses. SOLUTION: This method for producing a filament nonwoven fabric for artificial leather is characterized by comprising imparting lubricant having 0.35-0.45 fiber/fiber coefficient of static friction (F/F μs) and 0.20-0.30 fiber/metal coefficient of dynamic friction (F/M μd) to a filament assembly and, then, treating the resultant with needle-punching.

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 long-fiber nonwoven fabric for artificial leather, and more particularly, to a method for applying a lubricating oil having a specific property for needle punching to a long-fiber aggregate, and then performing needle punching. The present invention relates to a method for producing a long-fiber nonwoven fabric for artificial leather by entanglement.

[0002]

2. Description of the Related Art In recent years, long-fiber nonwoven fabrics do not require a series of large-scale equipment such as a raw cotton supply unit, a fiber opening device, a carding machine, etc., as in the method of producing short-fiber nonwoven fabrics, and have advantages in strength. Therefore, demand is expanding in a wide range of fields. For hygiene products and medical applications, a relatively low-weight nonwoven fabric is used, so that the entanglement means may be hot embossed adhesive, but for artificial leather applications and wiping cloth applications, high-content nonwoven fabrics are often used, so entanglement means are important. Becomes In general, as the entanglement means, there are a high-pressure water entanglement process and a needle punching process.

[0003] The high pressure water entanglement treatment requires expensive equipment,
The running cost is high, and the production conditions are at most such that the water flow pressure can be changed, and there is little room for selecting conditions depending on the application. In this regard, the needle punching process is relatively inexpensive in equipment, and the production conditions can be selected in a wide variety of applications, such as the type of needle, the depth of punching and the number of punches, and is superior to the high pressure water entanglement process. There is. However, in the case of long-fiber nonwoven fabric, unlike the needle-punching process of short-fiber nonwoven fabric, if the conditions are not properly selected, the fibers may be cut more than necessary or the fibers may be connected continuously, resulting in reentanglement. In many cases, the target strength cannot be obtained. That is, as a means of entanglement of a long-fiber nonwoven fabric, a conventional needlepunch method has not yielded a longfiber nonwoven fabric for artificial leather having excellent strength and sufficient natural leather-like softness and drape properties.

[0004]

SUMMARY OF THE INVENTION An object of the present invention is to provide a sufficiently natural leather-like softness and softness by a needle punch entanglement method which is economically inexpensive and has a wide choice of manufacturing conditions according to various uses. An object of the present invention is to provide a method for producing a long-fiber nonwoven fabric for artificial leather having drape properties and excellent strength. More specifically, by using a lubricant of a specific property for needle punching, and preferably by performing needle punching on a long-fiber nonwoven fabric composed of a composite long fiber having a specific structure, excellent strength and natural leather-like An object of the present invention is to provide a method for producing a long-fiber nonwoven fabric for artificial leather having excellent softness and drapability.

[0005]

When needle-punching a long fiber assembly, an ideal form is to cut the fibers unnecessarily and maintain the entangled state of the once entangled fibers. . For that purpose, various needle punch conditions are involved. According to the study of the present inventors, the most important of the various conditions is the fiber / fiber static friction coefficient (F / Fμ) of the lubricant for needle punching.
s) and the coefficient of kinetic friction between the fiber and the metal (F / M μd), and it was found that the use of an oil agent satisfying these coefficients within a certain specific range was extremely suitable, and the present invention was reached.

Thus, according to the present invention, the following (I) to
(III) A method for producing a long-fiber nonwoven fabric for artificial leather is provided. (I) The fiber / fiber static friction coefficient (F /
(Fμs) is 0.35 to 0.45, and an oil agent having a fiber / metal kinetic friction coefficient (F / Mμd) of 0.20 to 0.30 is applied, and then needle punching is performed. Of producing a long-fiber non-woven fabric for artificial leather. (II) (A) A long fiber aggregate formed of exfoliated splittable composite long fibers composed of two different components has a fiber / fiber static friction coefficient (F / F μs) of 0.35 to 0.45. And the fiber / metal dynamic friction coefficient (F / Mμd) is 0.1.
20 to 0.30 oil agent is applied (oil agent treatment step),
(B) The obtained long fiber aggregate is subjected to a needle punching process (needle punching process), and then (C) the separation type splittable conjugate fiber forming the long fiber aggregate is subjected to a splitting process (split processing step). A method for producing a long-fiber nonwoven fabric for artificial leather, comprising: (III) (A) A fiber / fiber static friction coefficient (F / Fμs) is applied to a long fiber aggregate formed of a heat-shrinkable exfoliated splittable composite long fiber which is composed of a polyester component and a polyamide component. Is 0.35 to 0.4
5 and the coefficient of kinetic friction between fiber and metal (F / Mμd)
Is applied (oil treatment step), (B) the obtained long fiber aggregate is subjected to needle punching (needle punch treatment step), and then (C) the long fiber The area of the long fiber aggregate is obtained by subjecting the splittable splittable conjugate fiber forming the aggregate to a division treatment (division treatment step) and then (D) heat-treating to thermally shrink the fiber made of the heat-shrinkable polyester component. Shrinking by 10 to 50% (shrinkage treatment step). Hereinafter, the present invention will be described in more detail.

[0007] In the method of the present invention, the oil agent to be applied to the long fiber aggregate is a fiber / fiber static friction coefficient (F / Fμs).
And the fiber / metal kinetic friction coefficient (F / Mμd) have specific ranges. These friction coefficients are values measured based on the radar method.

The F / F μs of the oil agent is in the range of 0.35 to 0.45, preferably in the range of 0.37 to 0.43. It is considered that F / F μs affects the ease of bringing in the fiber when the needle is driven into the fiber mass by the needle punching process, and further affects the ease with which the fiber returns when the needle is pulled out. When the needle is driven, it is preferable that the friction between the fibers is lower, because the fibers are smoothly entangled without resistance to the fiber being brought in by the barb of the needle.
However, when the needle comes off, since the fibers are connected because they are long fibers unlike short fibers, a force to return the entanglement works, so that the higher the friction between the fibers, the better. Considering these balances, as a result of repeated tests, F / Fμs
Was found to be 0.35 to 0.45. F /
When Fμs is lower than 0.35, the fibers are entangled smoothly when the needle is driven, but the entanglement is returned when the needle comes off, and sufficient nonwoven fabric strength cannot be obtained. Conversely, F / Fμs is 0.4
If it exceeds 5, the resistance between the fibers at the time of the driving of the needle is so large that a tight entanglement cannot be achieved, or the fibers are cut more than necessary and sufficient strength cannot be obtained. From the above,
F / Fμs is preferably 0.35 to 0.45.

On the other hand, F / M μd is in the range of 0.20 to 0.30, preferably in the range of 0.22 to 0.28. This indicator is the degree of friction between the needle and the fiber when the needle is driven. If F / M μd is smaller than 0.20, the fibers are not sufficiently caught on the barbs of the needles and slip through, so that sufficient confounding cannot be obtained. On the other hand, when F / Mμd exceeds 0.30, the barb firmly hooks the fiber, but at the same time, the resistance of the needle and the fiber other than the barb increases, and the fiber is cut more than necessary, and sufficient strength is obtained. I can't get it. Further, the wear of the needle is accelerated, which is not economical. For the above reasons, F / F μs is 0.20 to
0.30 is preferred.

In the method of measuring F / F μs and F / M μd, the F / F μs and F / M μd are measured using fibers actually used. It can also be obtained by conversion from a surface area ratio or the like. The lubricants for needle punching, in which the F / F μs value and the F / M μd value simultaneously satisfy the above ranges, include the following Group A oils from the viewpoint of lubricating effect, and provide oil film strength and rust prevention. From the effect of imparting properties, the following Group B oils can be mentioned. Group A: liquid hydrocarbon oil, liquid fatty acid ester, polyoxyalkylene alkyl ether, polyoxyalkylene-modified fatty acid ester Group B: alkyl phosphate salt, polyoxyalkylene alkyl phosphate salt, fatty acid salt Methyl laurate, oilel laurate, oilel mill styrate,
Isopropyl palmitate, octyl palmitate, lauryl isostearate, butyl stearate, amyl stearate, oleyl stearate, lauryl oleate, oleyl oleate, isotridecyl stearate and the like can be mentioned.

Further, as the alkyl phosphate salt,
For example, hexyl phosphate, octyl phosphate, lauryl phosphate, stearyl phosphate, isooctyl phosphate, isopalmityl phosphate, isostearyl phosphate, oleyl phosphate and mixtures thereof. As the salt-forming base, an alkali metal is preferable.

Examples of the polyoxyalkylene alkyl phosphate salt include polyoxyethylene 2 mol octyl ether phosphate salt, polyoxyethylene 3 mol lauryl ether phosphate salt, polyoxyethylene 5 mol lauryl ether phosphate salt, and polyoxyethylene 5 mol stearyl ether. Phosphate salt, polyoxyethylene 3 mol isooctyl ether phosphate salt, polyoxyethylene 3 mol isopalmityl ether phosphate salt, polyoxyethylene 20 mol isostearyl ether phosphate salt, polyoxyethylene 4 mol oleyl ether phosphate salt and mixtures thereof Is mentioned. As the salt-forming base, an alkali metal is preferable.

The fatty acid salt includes, for example, those having 6 to 22 carbon atoms.
A saturated or unsaturated fatty acid salt or a divalent fatty acid salt having a linear or branched chain. Such long-chain fatty acid salts include (1) hexanoate, octanoate,
Linear saturated fatty acid salts such as laurate and stearate, (2) branched saturated fatty acid salts such as isooctanoate, isopalmitate and isostearate, (3) oleate, elaidate and the like And divalent fatty acid salts such as (4) dodecenyl succinate and pentadecenyl succinate, and mixtures thereof. As the salt-forming base, an alkali metal is preferable.

At least one oil agent selected from the group A and the group B can be used alone or in combination. Other oils and the like can be added, but 50% by weight or more of A
It is preferably an oil agent selected from the group and the group B.
In order for each group to work effectively, it is preferable that the content is 10% by weight or more.

The amount of the lubricating oil for needle punching to be applied to the fiber varies depending on the oil used and the fiber used.
~ 5% by weight is preferred. More preferably, it is 0.5 to 3% by weight. When the amount is less than 0.3% by weight, the adhesion unevenness occurs and the effect is not sufficiently provided, and F / Fμs or F / Mμ
Since d remains large, sufficient strength cannot be obtained, and wear of the needle is accelerated. On the other hand, if the content exceeds 5% by weight, the surplus lubricating oil which does not adhere to the fibers adheres to the barb of the needle, lowering the confounding effect, and is not preferable from the viewpoint of economy. Therefore, the applied amount is preferably 0.3 to 5% by weight. The method of applying the lubricant for needle punching to the long fiber aggregate is not particularly limited, and any method can be used as long as it can be applied uniformly.

Further, the object of the present invention is to obtain a uniform and dense nonwoven fabric, and for this purpose, exfoliated splittable conjugate fibers are preferred as long fibers. As a thermoplastic polymer having a fiber-forming ability to constitute a split-split composite fiber,
As long as they are not compatible with each other, basically any polymer can be used in combination, but melt spinning is possible, taking into account the process control and productivity in producing exfoliated splittable conjugate fibers. A combination of two kinds of a polyester resin and a polyamide resin can be suitably used.

The synthetic resin used for producing the splittable conjugate fiber of the present invention is preferably a combination of two incompatible components of a fiber-forming polyester resin and a fiber-forming polyamide resin. Examples of the polyester-based resin include polyethylene terephthalate and polybutylene terephthalate, and examples of the polyamide-based resin include nylon-6, nylon-66, and nylon-12. Among them, a combination of polyethylene terephthalate / nylon-6 is preferred in terms of processability, cost, and the like. At this time, as another component of the polyester resin, a polyester copolymer resin containing a metal salt sulfonate may be added to form a three-component resin.

The exfoliated splittable conjugate long fiber of the present invention has a structure in which at least one of the constituent components is divided into two or more in the cross section of the fiber, and at least a part of each constituent component is exposed on the fiber surface. Although the number of divisions is not particularly limited, 8-36 divisions are particularly preferable in consideration of processability and peeling division. The exfoliated splittable composite long fiber of the present invention also
The proportion of the components relative to the whole components is preferably 30 to 70% by weight from the viewpoint of fiber splitting and spinnability. Especially 40
~ 60% by weight is preferred. Beyond this range, it is difficult to adjust the viscosity balance of the resin, resulting in section failure,
This is because there is a possibility that the division ratio may decrease.

The long fibers, particularly the split-split composite long fibers, are collected on the porous collecting surface while being spread by a high-speed traction fluid by a spun bond method. Here, the speed of the high-speed towing may be set in the range of 3000 to 8000 m / min, and the spun yarn may be pulled at a high speed by the ejector, the air sucker, or the like at the above-described speed. The long-fiber nonwoven fabric obtained in this manner is obtained by accumulating a plurality of sheets or by itself, preliminarily heat-bonded as necessary, and once wound up or continuously as it is, by the method described above. To give an entangled non-woven fabric.

The conditions for needle punching the oil-treated long-fiber nonwoven fabric are more efficient when the number of barbs is greater, but within a range where needle breakage does not occur.
You can choose from 9 barbs, with a barb depth of 0.
It is preferable to set the thickness to 02 to 0.2 mm from the viewpoint of confounding properties and smoothness of the needle. Various conditions can be considered for the needle depth depending on the distance from the tip of the needle to the barb, but it is preferable to make the needle depth deeper as long as the needle tracking is not strong. The number of punches is 300-5000P /
cm ² is preferred.

Next, the method of dividing the entangled nonwoven fabric into fibers will be described. The method is not particularly limited as long as the division can be performed reliably. As the mechanical division treatment, a known method such as a method of applying pressure between rollers, a method of performing ultrasonic treatment, a method of performing high-pressure water flow treatment, a method of giving an impact, and a method of performing kneading treatment can be used. As the chemical splitting treatment, a conventionally known method such as immersion treatment in a chemical solution that swells at least one component constituting the peelable splittable conjugate fiber can be used. However, in the case where shrinkage treatment by heat is performed subsequent to the division treatment, a division treatment method in which heat is applied before the fiber division is performed is not preferable.

In the production of the long-fiber nonwoven fabric for artificial leather according to the present invention, the subsequent shrinkage treatment by heat applied after the fiber splitting treatment eliminates coarse voids inside the long-fiber nonwoven fabric and produces a uniform and dense structure. It is effective to let.
If the non-woven fabric is composed of long fibers having different shrinkage performances, it is preferable that one component is a conjugate fiber having heat shrinkability, and the composite fiber having the heat shrinkability and the other component is 95%. The difference in the heat shrinkage in hot water at ℃ is preferably 5 to 50%, particularly preferably 10 to 30%.

The heat shrinkage was 0.56 g of long fibers.
It is determined from the shrinkage rate when shrinking treatment is performed in hot water of 95 ° C. for 30 minutes under a load of / dtex, where the shrinking rate is ((length before shrinkage processing−length after shrinkage processing) / (shrinkage processing) (Length before)) × 100 (%).

The long-fiber nonwoven fabric is gently heated in hot water at 70 to 100 ° C and / or dry heat at 80 to 140 ° C.
It is preferable to perform shrinkage treatment for about 0 seconds to 10 minutes to shrink the nonwoven fabric so as to have an area shrinkage of 10 to 50%. More preferably, it is 25% to 45%. If the area shrinkage is less than 10%, sufficient denseness cannot be obtained,
It is not preferable in a field where a high-grade texture is required, such as artificial leather, and when the area shrinkage exceeds 50%,
It becomes too dense and conversely becomes hard, and the texture is reduced. For the above reasons, the area shrinkage is preferably 10 to 50%. The area shrinkage ratio is determined by [(area of long-fiber nonwoven fabric before shrinkage−area of long-fiber nonwoven fabric after shrinkage) / (area of long-fiber nonwoven fabric before shrinkage)] × 100 (%).

Next, the features of the long-fiber nonwoven fabric for artificial leather manufactured by the method of the present invention will be described. The following requirements (a)
It is preferable to satisfy (c). (A) The tensile strength per unit weight of 100 g / m ² is 50 to 150 N / cm in both length and width. (B) The peel strength is 40 to 70 N / cm in both the vertical and horizontal directions. (C) The bending hardness by the 41.5 ° cantilever method is
30-120 mN · cm for both length and width.

The long-fiber nonwoven fabric for artificial leather of the present invention further comprises the following (d) to (d) in addition to the above (a) to (c).
It is particularly preferable that the characteristic of (f) is satisfied. (D) The apparent density is 0.25 to 0.55 g / cm ³ . (E) The average area of voids in an arbitrary cross section of the nonwoven fabric is 70 to 70 as measured by image analysis using a scanning electron microscope.
300 μm ² . (F) The standard deviation of the void area in an arbitrary cross section of the nonwoven fabric is 2 as a value measured by image analysis with a scanning electron microscope.
It has a uniform structure of 00 to 450 μm ² .

The requirement (a) will be described.
Tensile strength per 0 g / m ² is 50-1
It is in the range of 50 N / cm. Conventionally, the above (d),
It was very difficult to satisfy (e) and (f) and further obtain this strength range. If it is less than 50 N / cm, it has no strength advantage over conventional nonwoven fabrics, and does not reach high-strength natural leather. In addition, a non-woven fabric using a heat-shrinkable fiber such as the non-woven fabric is 150 N / cm.
In practice, it is difficult to exceed the limit because the strength of the fiber itself is limited.

Explaining the requirement (b), the peel strength is in the range of 40 to 70 N / cm in both the vertical and horizontal directions. 40
Below N / cm, as with tensile strength, there is no strength advantage over conventional nonwoven fabrics. Also, 70
It is actually difficult to exceed N / cm because the strength of the fiber itself is limited. To explain the requirement (d), the apparent density is preferably 0.25 to 0.55 g / cm ³ , and more preferably 0.30 to 0.40.
g / cm ³ . When it is lower than 0.25 g / cm ^3, it is not suitable for artificial leather and the like because of lack of fulfillment.
If it is higher than g / cm ³ , hardness is unfavorably felt. Therefore, the apparent density is preferably from 0.25 to 0.55 g / cm ³ .

To explain requirements (e) and (f), the average area of voids in an arbitrary cross section of the long-fiber nonwoven fabric is preferably 70 to 300 μm ² . If it is smaller than 70 μm ² , a high-density non-woven fabric will be obtained, which is unprecedented. If it exceeds 300 μm ² , it is not preferable because only a non-woven fabric having bending folds with poor buckling property can be obtained. Therefore, 70 to 300 μm ² is preferable.

Further, the standard deviation of the void area is 200
４５０450 μm ² is preferred. If it exceeds 450 μm ² , it means that large voids are scattered even if the above-mentioned average void area value is within a preferable range, and bending wrinkles are likely to occur. On the other hand, the smaller the standard deviation is, the more uniform the structure becomes. Therefore, it is preferable that the standard deviation is practically about 200 μm ² . Therefore, 200 to 450 μm ² is preferable. In addition, the void area in the present invention is a value measured by image analysis with a scanning electron microscope described in Examples described later.

Further, in the long-fiber nonwoven fabric for artificial leather of the present invention, each fiber constituting the non-woven fabric preferably has a single fineness of 0.0.
01 to 1 dtex, more preferably 0.01 to 0.5 d
tex, particularly preferably 0.05 to 0.4 dtex. Separation-type fiber with a single fineness of 0.001 d after splitting
In order to make it smaller than tex, it is necessary to make the single yarn fineness of the parent yarn considerably smaller or to make the number of peeling divisions considerably larger, but this is not practical in terms of the cost for producing a die or the spinning technique. On the other hand, if it is larger than 1 dtex, the drape property is inferior, which is not preferable. Therefore, the single fineness of each fiber is preferably 0.001 to 1 dtex.

[0032]

EXAMPLES The present invention will be described in more detail with reference to the following Examples, which should not be construed as limiting the present invention. In addition, each measured value in an Example is each calculated | required according to the following method, and unless otherwise indicated, a measured value is an average value of five points.

Adjustment of oily friction measurement sample yarn
Spray 10 times the volume of double dilution oil. Then, air-dry to obtain a measurement sample. F / Fμs value by radar method: 20 ° C. × 60% RH using the sample thread prepared by the above method and combining the adhering oil components with “Radar method fiber friction coefficient measuring device” manufactured by Aoi Seiki Laboratory.
It measured in the atmosphere of. F / M μd value by radar method: Using a sample thread created by the above method and a scraping body test piece (chrome plated satin of φ8 mm) with Aoi Seiki Laboratories “Radar Method Fiber Friction Coefficient Measuring Machine” 20 ° C x 60% RH
The coefficient of kinetic friction between the fiber and the metal was measured at a speed of 1800 cm / min in an atmosphere of.

Sample Thickness: The thickness was measured using a thickness measuring device (“PEACOCK Model H” manufactured by Daiei Kagaku Seiki Seisaku-Sho, Ltd.) while applying a load of 1.76 N (180 gf) per 1 cm ^{2 of} the sample. Tensile stress, tensile strength and elongation at break: JIS L-10
According to the method described in No. 96, a sample piece having a width of 2 cm and a length of 15 cm is gripped at an interval of 10 cm, and is stretched at a pulling speed of 10 cm / min using a constant-speed stretching type tensile tester. The tensile strength (σ20), the load value at the time of cutting, and the elongation were defined as tensile strength and elongation at break, respectively. Peel strength A peel test was performed according to the following method in accordance with the method described in JIS K-6301. That is, a vinyl chloride sheet with a hot-melt adhesive of the same size is attached to one surface of a sample piece having a width of 2 cm and a length of 9 cm, and heat is applied to the vinyl chloride sheet side at 130 ° C. for 10 minutes so as to be bonded to the sample piece. A vinyl chloride sheet is similarly adhered to the other surface.
The vinyl chloride edges on both sides of this sample piece were grasped and gripped at an interval of 2 cm, and the tensile speed was 5 cm using a constant-speed extension type tensile tester.
/ Cm at 3 cm / min.
The average load value at the time of peeling was defined as the peel strength.

Bending hardness: A method was used in accordance with JIS L-1912, a 41.5 ° cantilever method, and a test piece having a width of 25 mm and a length of 150 mm was used. It was calculated as follows. G = m × C ³ × 10 ^-3 where G: bending hardness (mN · cm) m: mass per unit area of test piece (g / m ² ) C: average bending length (cm) In the equation, the acceleration of 9.81 m / s ² is 10 m / s
Calculated as ² .

Average area of voids and standard deviation: The average area of voids between fibers in the cross section of the nonwoven fabric and the cross section of the artificial leather was measured by the following image analysis method using a scanning electron microscope. (1) Sample preparation: A cross-sectional sample of the nonwoven fabric to be measured is measured by an ion sputtering apparatus “JFC” manufactured by JEOL Ltd.
-1500 ", the working pressure is 0.1 Pa or less,
A gold film is formed by an ion sputtering method under the condition of a coating film thickness of 800 angstroms. (2) Electron microscopic photographing: The sample prepared in the above (1) was accelerated by using a scanning microscope “JSM-6100” manufactured by JEOL Ltd. at an accelerating voltage of 5 kV and a filament current of 2.2.
A, scanning speed: 15.7 sec / line (horizontal, 60H
displaying the image signal waveform on the observation CRT under the condition of z),
The peak and the lowest level of the waveform are each 5 V on the potential scale.
And 0V, the waveform monitor is turned off, exposure is determined, and the magnification is set to 200 times. (3) Image processing: Using the high-definition image analysis system “IP-1000PC” manufactured by Asahi Kasei Corporation, select the image processing of “open hole measurement” for the image automatically input from the scanning microscope and measure. I do. In this case, the threshold value for binarization of image processing is the luminance at the middle point between the luminance at the peak position of the luminance distribution obtained from the image analysis and the luminance at the lowest level (luminance 0). Then, a low-luminance portion surrounded by the threshold is extracted as a void portion. (4) Calculation of average area and standard deviation: The areas of the above-described extracted void portions existing in the 0.25 mm ² area of the nonwoven fabric cross section were measured, and the same operation was performed at least three times at different positions in the nonwoven fabric cross section. repeat. The average area and the standard deviation were determined from the area of the void portion obtained as described above.

Reference Example 1 (Preparation of long fiber aggregate): 10 mol% of dimethyl isophthalate based on dimethyl terephthalate as the first component
Copolymerized polyethylene terephthalate (intrinsic viscosity 0.64 in o-chlorophenol) obtained by polycondensing an acid component containing
-Using nylon (intrinsic viscosity of 1.1 in m-cresol), melted with an extruder and discharged from a hollow die at a discharge rate of 2 g / min per filament, and pulled at high speed with an ejector pressure of 0.2 MPa. After that, the fiber was made to collide with a dispersion plate together with an air flow to open the filaments, and collected as a long fiber aggregate made of a split-split composite fiber having a 16-split multi-layer cross section by a collection net conveyor. The volume ratio of both components was 50:50, and both components were alternately arranged, and the number of arrangement was 16. The fiber fineness before the separation was 5 dtex.

Reference Example 2 (Preparation of Oil Agent-1): Isotridecyl stearate 47
Parts by weight, 29 parts by weight of polyoxyethylene 10 mol laurate ester, 13 parts by weight of polyoxyethylene 5 mol oleyl ether, 6 parts by weight of polyoxyethylene 30 mol castor oil ether and 5 parts by weight of water were uniformly mixed.
Oil solution-1 was prepared. The long fiber (filament) of Reference Example 1 was taken out, and a 2% by weight solution of oil agent-1 was used to obtain a fiber having an oil agent adhesion amount of 1% by weight. The F / Fμs of the oil-treated fiber is 0.385, and the F / Mμ
d was 0.260.

Example 1 (Preparation of long fiber nonwoven fabric):
The oil agent-1 was sprayed at an effective concentration of 20% by weight and sprayed to 5.0% by weight with respect to the fiber weight to make the weight of the effective oil agent adhered to 1% by weight.
g / m ^2, and using a commercially available 3-barb type needle (40th count) at a needle penetration depth of 10 mm and 400P
/ Cm performs a needle-punched by ^two of the conditions, then,
The fiber splitting process is performed by passing the leather kneader three times,
Subsequently, it was immersed in a hot water bath at 80 ° C. for 60 seconds to perform shrinkage treatment, and dried with a hot air drier at 110 ° C. to obtain a nonwoven fabric-1 having a basis weight of 345 g / m ² and an apparent density of 0.334 g / cm ³ . . The vertical and horizontal tensile strengths of the nonwoven fabric were 211 N / cm and 232 N / cm, and the peel strengths in the vertical and horizontal layers were 51 N / cm and 47 N / cm. Flexural hardness: vertical 86.3 mN · cm, horizontal 74.9
mN · cm.

Reference Example 3 (Preparation of Oil Agent-2): 47 parts by weight of butyl stearate,
29 parts by weight of polyoxyethylene 10 mol laurate ester, polyoxyethylene 5 mol oleyl ether 13
By weight, 6 parts by weight of polyoxyethylene 30 mol castor oil ether and 5 parts by weight of water were uniformly mixed to prepare Oil Agent-2. The F / Fμ of the fiber obtained by taking out the long fiber (filament) of Reference Example 1 and treating it with an oil agent in the same manner as in Reference Example 2.
s was 0.380 and F / M μd was 0.233.

Example 2 (Preparation of nonwoven fabric-2): The same procedure was followed as in Example 1 except that Oil-2 was used in place of Oil-1 to obtain a basis weight of 33.
4 g / m ² , non-woven fabric with an apparent density of 0.351 g / cm ³
2 was obtained. The nonwoven fabric has a vertical and horizontal tensile strength of 2
The peel strengths in the vertical and horizontal layers were 53 N / cm and 52 N / cm, respectively. Flexural hardness: vertical 93.9mNcm, horizontal 84.8m
N · cm. The average area of voids in an arbitrary cross section of this nonwoven fabric was 158 μm ^{2 as} measured by image analysis using a scanning electron microscope, and the standard deviation of this area was 295 μm ^2. It was excellent in texture as a non-woven fabric for artificial leather.

Example 3 (Preparation of non-woven fabric-3): In the same manner as in Example 2, except that the oil agent-2 was applied to the fibers by spraying an effective oil agent of 2.5% by weight, the basis weight was 346 g / m2. ^2. Non-woven fabric-3 having an apparent density of 0.346 g / cm ³ was obtained. The nonwoven fabric has a vertical and horizontal tensile strength of 208 N / cm and 2
11N / cm, peel strength in vertical and horizontal layers is 51N / cm
cm and 51 N / cm. Bending hardness is vertical 8
It was 7.8 mN · cm and width 69.6 mN · cm. The average area of the voids in any cross section of this nonwoven fabric is
14 as the value of the measurement method by image analysis of the scanning electron microscope
9 .mu.m ^2, the standard deviation of this area is 288 microns ^2, the fibers have densely and uniformly filled, and was excellent in feeling as an artificial leather for nonwovens.

Reference Example 4 (Preparation of Oil Agent-3): Lauryl phosphate potassium salt 6 parts by weight, isotridecyl stearate 42.3 parts by weight, polyoxyethylene 10 mol lauric ester 2
6.1 parts by weight, 11.7 parts by weight of polyoxyethylene 5 mol oleyl ether, 5.4 parts by weight of polyoxyethylene 30 mol castor oil ether and 8.5 parts by weight of water were uniformly mixed to prepare oil agent-3. . The long fiber (filament) of the above-mentioned Reference Example 1 was taken out and treated with an oil agent in the same manner as in Reference Example 2 to have an F / F μs of 0.375 and an F / M μd of 0.3.
277.

Example 4 (Preparation of non-woven fabric-4): The same procedure was followed as in Example 1 except that Oil agent-3 was used instead of Oil agent-1 to obtain a basis weight of 34.
Non-woven fabric with 6 g / m ² and apparent density of 0.337 g / cm ³
5 was obtained. The nonwoven fabric has a vertical and horizontal tensile strength of 2
The peel strengths in the vertical and horizontal layers were 18 N / cm and 239 N / cm and 51 N / cm and 57 N / cm, respectively. Flexural hardness: vertical 90.1mNcm, horizontal 83.3m
N · cm. The average area of voids in an arbitrary cross section of the nonwoven fabric is 144 μm ² as a value measured by image analysis using a scanning electron microscope, and the standard deviation of this area is 281 μm ^2. It was excellent in texture as a non-woven fabric for artificial leather.

Reference Example 5 (Preparation of Oil Agent-4): Dodecenyl succinic acid potassium salt 3
Parts by weight, 42.3 parts by weight of isotridecyl stearate,
Polyoxyethylene 10 mol laurate 26.
1 part by weight, 11.7 parts by weight of polyoxyethylene 5 mol oleyl ether, 5.4 parts by weight of polyoxyethylene 30 mol castor oil ether and 11.5 parts by weight of water were uniformly mixed to prepare an oil agent-4. The F / Fμs of the fiber obtained by taking out the long fiber (filament) of Reference Example 1 and treated with the oil agent in the same manner as in Reference Example 2 was 0.392, and the F / Mμd was 0.26.
It was 4.

Example 5 (Preparation of Nonwoven Fabric-5): The same procedure was followed as in Example 1 except that Oil Agent-4 was used instead of Oil Agent-1 to obtain a basis weight of 35.
8 g / m ² , non-woven fabric with an apparent density of 0.357 g / cm ³
5 was obtained. The nonwoven fabric has a vertical and horizontal tensile strength of 2
The peel strengths in the vertical and horizontal layers were 38 N / cm and 252 N / cm, and 55 N / cm and 61 N / cm. Flexural hardness: vertical 95.4mNcm, horizontal 87.1m
N · cm. The average area of voids in any cross section of the nonwoven fabric, 127 [mu] m ² with the value of the measuring method by the image analysis of the scanning electron microscope, the standard deviation of this area is 280 .mu.m ^2, fibers are densely and uniformly packed It was excellent in texture as a non-woven fabric for artificial leather.

Comparative Example 1 (Preparation of Nonwoven Fabric-6): A nonwoven fabric-6 having a basis weight of 323 g / m ² and an apparent density of 0.314 g / cm ³ was obtained in the same manner as in Example 1, except that no oil agent was used. . The nonwoven fabric has a tensile strength of 74 N / cm and a transverse tensile strength of 79 N / cm.
N / cm, peel strength in vertical and horizontal layers is 14 N / cm
And 16 N / cm, which was inferior in strength as a nonwoven fabric for artificial leather.

Reference Example 6 (Preparation of Oil Agent-5): An oil agent-5 was prepared by uniformly mixing 20 parts by weight of polyoxyethylene tribenzylated phenol ether and 60 parts by weight of water. The F / Fμs of the fiber obtained by taking out the long fiber (filament) of the above Reference Example 1 and treating it with an oil agent in the same manner as in Reference Example 2 is 0.352, F / Mμd
Was 0.308.

Comparative Example 2 (Preparation of Nonwoven Fabric-7): The same procedure was followed as in Example 1 except that Oil Agent-5 was used instead of Oil Agent-1 to obtain a basis weight of 33.
Non-woven fabric of 1 g / m ² and apparent density of 0.323 g / cm ³
7 was obtained. The vertical and horizontal tensile strength of this nonwoven fabric is 1
04N / cm and 112N / cm, peel strength in vertical and horizontal layers are 25N / cm and 27N / cm,
The nonwoven fabric for artificial leather was inferior in strength.

Reference Example 7 (Preparation of Oil Agent-6) An oil agent-6 was prepared by uniformly mixing 30 parts by weight of amino / polyether-modified dimethyl silicone and 70 parts by weight of water. The F / Fμs of the fiber obtained by taking out the long fiber (filament) of Reference Example 1 and treated with the oil agent in the same manner as in Reference Example 2 was 0.402, and the F / Mμd was 0.33.
It was 3.

Comparative Example 3 (Preparation of non-woven fabric-8): The same procedure was followed as in Example 1 except that Oil agent-6 was used instead of Oil agent-1 to obtain a basis weight of 32.
9 g / m ² , non-woven fabric with an apparent density of 0.316 g / cm ³
8 was obtained. This nonwoven fabric has a vertical and horizontal tensile strength of 8
The peel strengths in the vertical and horizontal layers were 6 N / cm and 99 N / cm, and the peel strengths in the vertical and horizontal layers were 21 N / cm and 25 N / cm, respectively.

Reference Example 8 (Preparation of Oil Agent-7): Carnauba wax 25 parts by weight, P
2 parts by weight of EG2000 monostearate, 3 parts by weight of polyoxyethylene 15 mol oleyl ether and 70 parts by weight of water were uniformly mixed to prepare Oil Agent-7.
The F / Fμs of the fiber obtained by taking out the long fiber (filament) of Reference Example 1 and treating it with an oil agent in the same manner as Reference Example 2 is 0.2.
86, F / Mμd was 0.230.

Comparative Example 4 (Preparation of Nonwoven Fabric-9): The same procedure was followed as in Example 1 except that Oil Agent-7 was used instead of Oil Agent-1 to obtain a basis weight of 32.
7 g / m ² , non-woven fabric with an apparent density of 0.318 g / cm ³
9 was obtained. The vertical and horizontal tensile strength of this nonwoven fabric is 1
15N / cm and 126N / cm, peel strength in vertical and horizontal layers are 29N / cm and 32N / cm,
The nonwoven fabric for artificial leather was inferior in strength.

[0054]

[Table 1]

[0055]

[Table 2]

[0056]

[Table 3]

[0057]

According to the method for producing a long-fiber nonwoven fabric for artificial leather of the present invention, a long-fiber aggregate has a specific coefficient of static friction between fibers / fibers (F / Fμs) and a specific coefficient of dynamic friction between fibers / metal (F / Fμs). (Mμd), a lubricating oil for needle punching is applied, the mixture is entangled by needle punching, and the aggregate of exfoliated split type composite long fibers is subjected to entanglement split shrinkage treatment to produce a long-fiber nonwoven fabric for artificial leather. hand,
The nonwoven fabric obtained by the production method has high tensile strength and peeling strength, and also has excellent softness and drapability. In addition, since the fiber of the present invention is entangled by needle punching, the strength in the vertical and horizontal directions can be easily adjusted, and even a nonwoven fabric having a large basis weight can be easily entangled.

 ──────────────────────────────────────────────────続 き Continuing from the front page (72) Inventor Satoshi Maeda 1-1-1 Enichicho, Mihara-shi, Hiroshima Teijin Inside Mihara Works (72) Inventor Nobuo Okawa 1-chome, Enichicho, Mihara-shi, Hiroshima No. 1-1 Teijin Mihara Works (72) Inventor Kazuhiro Morishima 77 Kitayoshida-cho, Matsuyama-shi, Ehime Prefecture Teijin Limited Matsuyama Works (72) Inventor Keita Inoue 2-5 Minatomachi, Gamagori-shi, Aichi Takemoto Yushi Co., Ltd. F-term (reference) 4F055 AA01 BA02 BA11 EA04 EA05 EA13 EA14 EA24 EA32 EA34 HA05 HA14 4L047 AA21 AA23 AA27 AB03 AB10 BA03 BA22 CA19 CB01 CB10 CC01 DA00

Claims (15)

[Claims] 1. The fiber assembly has a fiber / fiber static friction coefficient (F / F μs) of 0.35 to 0.45 and a fiber / metal dynamic friction coefficient (F / M μd) of 0.20 to 0.30
A method for producing a long-fiber nonwoven fabric for artificial leather, which comprises applying an oil agent, and then performing a needle punching treatment. 2. The method for producing a long-fiber nonwoven fabric for artificial leather according to claim 1, wherein said oil agent contains at least one oil agent selected from the following groups A and B. Group A: liquid hydrocarbon oil, liquid fatty acid ester, polyoxyalkylene alkyl ether, polyoxyalkylene modified fatty acid ester Group B: alkyl phosphate salt, polyoxyalkylene alkyl phosphate salt, fatty acid salt 3. The method for producing a long-fiber nonwoven fabric for artificial leather according to claim 1, wherein the oil agent is added in an amount of 0.3 to 5.0% by weight based on the weight of the long-fiber aggregate. (A) a long fiber aggregate formed of a split-split composite long fiber composed of two different components;
Fiber / fiber static friction coefficient (F / F μs) 0.35 to 0.3.
45 and the coefficient of kinetic friction between fiber and metal (F / Mμ
d) is applied with an oil agent of 0.20 to 0.30 (oil agent processing step), and (B) needle punching is performed on the obtained long fiber aggregate (needle punch processing step), and then (C)
A method for producing a long-fiber nonwoven fabric for artificial leather, comprising a step of dividing (split-treating) the peelable splittable conjugate fiber forming the long-fiber aggregate. 5. The method according to claim 4, wherein the two different components are a polyester component and a polyamide component. 6. (D) After the (C) splitting step, the area of the long fiber assembly subjected to heat treatment and splitting processing is reduced to 10 to 50.
% (Shrinkage treatment step). 7. The method for producing a long-fiber nonwoven fabric for artificial leather according to claim 4, wherein said oil agent contains at least one oil agent selected from the following groups A and B. Group A: liquid hydrocarbon oil, liquid fatty acid ester, polyoxyalkylene alkyl ether, polyoxyalkylene modified fatty acid ester Group B: alkyl phosphate salt, polyoxyalkylene alkyl phosphate salt, fatty acid salt 8. The method for producing a long-fiber nonwoven fabric for artificial leather according to claim 4, wherein the oil agent is added in an amount of 0.3 to 5.0% by weight based on the weight of the long-fiber aggregate. 9. The tensile strength per unit weight of 100 g / m ² of the long-fiber nonwoven fabric is 50 to 150 N / cm in both length and width, and the peel strength is 40 to 70 N / cm in both length and width, and 41. The method for producing a long-fiber nonwoven fabric for artificial leather according to claim 4, wherein the bending hardness by the 0.5 ° cantilever method is 30 to 120 mN · cm in both length and width. 10. The apparent density of a long-fiber nonwoven fabric is 0.25.
０0.55 g / cm ³ , the average area of voids in an arbitrary cross section is 70 to 300 μm ^{2 as} a value measured by image analysis using a scanning electron microscope, and the standard deviation of the area of voids in an arbitrary cross section There process for producing an artificial leather for long-fiber nonwoven fabric according to claim 4 which is 200～450Myuemu ² by the value of the measuring method by the image analysis of the scanning electron microscope. 11. A fiber-to-fiber static friction coefficient (F / F) is added to a long fiber aggregate formed of (A) a polyester component and a polyamide component, and the polyester component is formed of a heat-shrinkable exfoliated splittable composite long fiber. Fμs) is 0.3
5 to 0.45, and the coefficient of kinetic friction between fiber and metal (F
/ Mμd) of 0.20 to 0.30 (oil treatment step), (B) needle punching the obtained long fiber aggregate (needle punch treatment step), and then (C) The separation type splittable conjugate fiber forming the long fiber aggregate is split (split processing step), and then (D) heat treatment is performed to thermally shrink the fiber made of the heat-shrinkable polyester component. 10-50% body area
Shrinking (shrinking treatment step), comprising the steps of: producing a long-fiber nonwoven fabric for artificial leather. 12. The method for producing a long-fiber nonwoven fabric for artificial leather according to claim 11, wherein the oil agent contains at least one oil agent selected from the following groups A and B. Group A: liquid hydrocarbon oil, liquid fatty acid ester, polyoxyalkylene alkyl ether, polyoxyalkylene modified fatty acid ester Group B: alkyl phosphate salt, polyoxyalkylene alkyl phosphate salt, fatty acid salt 13. The method for producing a long-fiber nonwoven fabric for artificial leather according to claim 11, wherein the oil agent is added in an amount of 0.3 to 5.0% by weight based on the weight of the long-fiber aggregate. 14. The tensile strength per unit weight of 100 g / m ² of the long-fiber nonwoven fabric is 50 to 150 N / cm in both length and width.
The peel strength is 40 to 70 N / cm in both the vertical and horizontal directions.
The bending hardness by the 41.5 ° cantilever method is 30 to 120 mN · cm in both the vertical and horizontal directions.
2. The method for producing a long-fiber nonwoven fabric for artificial leather according to 1. 15. The long-fiber nonwoven fabric has an apparent density of 0.25.
０0.55 g / cm ³ , the average area of voids in an arbitrary cross section is 70 to 300 μm ^{2 as} a value measured by image analysis with a scanning electron microscope, and the standard deviation of the area of voids in an arbitrary cross section 12. The method for producing a long-fiber nonwoven fabric for artificial leather according to claim 11, wherein the measured value is 200 to 450 μm ^{2 as} measured by image analysis with a scanning electron microscope.