JP2012158842A - Fiber, method for manufacturing the same and water-repellent fabric - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide water-repellent fiber that may exhibit very high water-repellent performances, without a post treatment for water repellency, by providing highly dense streaky irregularities on a surface of the fiber and is good at dyeability, and a method for simply and stably manufacturing the fiber.SOLUTION: Fiber of this invention made of a thermoplastic resin is polymer alloy fiber comprising a dyeable polymer A and another polymer B, and having a plurality of streaky portions arranged in a lengthwise direction of fiber on a surface thereof. Each of the streaky portions has one or a plurality of peaks with a maximum height of 10 nm or more and 300 nm or less from troughs on both sides, and a distance between adjacent streaky portions is 100 nm or more and 1400 nm or less.

Description

  The present invention relates to a fiber having excellent water repellency and excellent dyeability even if a fiber structure such as a fabric is not subjected to post-water-repellent post-treatment, and a method for producing the same.

  Conventionally, it has been widely practiced to treat a fabric with a dispersion containing a fluorine-based resin or a silicone-based resin and attach the resin to the surface of the fabric to perform a water repellent treatment. However, although the fabrics obtained by these processing treatments have water repellency, when the amount is sufficient to give sufficient water repellency, the texture of the fabric becomes hard, so that the repellency of sportswear, casual wear, etc. Application to fields where both water and texture are required has been greatly limited. In addition, water-repellent fibers having a soft texture have been obtained by making fibers and fabrics using only a resin having water repellency and hydrophobicity originally, but such a resin has poor dyeability in the first place. It was not suitable for clothing use.

  Therefore, a method of imparting water repellency by causing a streak-like convex body made of a fluororesin in the vicinity of the fiber surface to appear discontinuously in the fiber axis direction has been proposed (Patent Document 1, etc.). In this method, the dispersion state of the fluororesin is not sufficient, the distribution density of the streaks existing on the surface of the yarn is low, and it is difficult to express high water repellency. However, there was a problem that when the amount was reduced too much, the fluororesin was liable to fall off, and when it was insufficient, the water repellency was not exhibited, so that stable water repellency could not be exhibited. Furthermore, in addition to the increase in cost and raw material loss associated with weight reduction processing, there is a problem that it is difficult to impart water repellency by such a method for resins that cannot be weight-reduced.

JP-A-9-302524

  The present invention makes it possible to develop high density streaky irregularities on the surface of the fiber, so that it has extremely excellent water repellency even without being subjected to post-water repellency treatment, and has good dyeability. Provide a fiber and it simply and stably.

In order to solve the above-described problems, the present invention has the following configuration.
(1) A polymer alloy fiber composed of a dyeable polymer A and another polymer B and having a sea-island structure, and has a plurality of streaks arranged in the fiber longitudinal direction on the fiber surface. The thermoplastic resin is characterized in that it has one or a plurality of peaks having a maximum height from 10 nm to 300 nm or less, and the distance between the streaks is 100 nm or more and 1400 nm or less. fiber.
(2) The fiber as described in (1) above, wherein the polymer alloy fiber has a sea-island structure, the dyeable polymer is a sea component, and the other polymer is an island component.
(3) The polymer alloy fiber has a sea-island structure, and among the dyeable polymer A and the other polymer B, the melt mass flow rate (MFR) X of the polymer constituting the sea component constitutes the island component. The fiber according to any one of (1) to (2) above, wherein the melt mass flow rate (MFR) Y of the other polymer satisfies the following formula (1).
Formula (1) 7 <= X / Y <= 37
(4) The fiber according to any one of (1) to (3) above, wherein the dyeable polymer is polyamide and the other polymer is polyolefin.
(5) Among polymers A and B, the weight ratio of the polymer constituting the sea component and the polymer constituting the island component is mixed at 80/20 to 60/40, and the total weight of both the above polymers The fiber according to any one of (1) to (4) above, wherein 1 to 3% by weight of a compatibilizing agent is added.
(6) A water-repellent fabric comprising the fiber according to any one of (1) to (5) above.
(7) When the dyeable polymer A and the other polymer B are mixed and melt-spun to produce a polymer alloy fiber having a sea-island structure, among the dyeable polymer A and the other polymer B, the sea component is Dyeable polymer A and other polymers B such that the melt mass flow rate (MFR) X of the constituent polymer and the melt mass flow rate (MFR) Y of the constituent of the island satisfy the following formula (1) The method for producing a fiber according to any one of (1) to (5) above, wherein
Formula (1) 7 <= X / Y <= 37

  The fiber of the present invention has extremely excellent water-repellent performance without the post-water-repellent processing due to the presence of the streaky convex protrusions on the fiber surface. Water repellent performance can be maintained for a long period of time compared to post-processing, and the texture of the fabric is not impaired as in the case of normal water-repellent post-processing. And can be used as a textile material for clothing such as sportswear and casual wear.

It is an AFM (atomic force microscope) image which shows an example of the filamentous part manufactured in Example 1 of this invention. It is an AFM image which shows an example of the micro processus | protrusion on the stripe part of the fiber manufactured in Example 1 of this invention.

  Hereinafter, the constituent requirements of the present invention will be described in detail.

  The fiber of the present invention needs to have a plurality of streak portions arranged in a specific form in the longitudinal direction of the single yarn on the surface of the single yarn. This is to increase the specific surface area of the fiber by forming irregularities on the surface of the single yarn by the streaks, so that the so-called lotus leaf effect is manifested on the fiber surface, thereby providing an excellent water repellent effect. is there.

  The streaks mentioned here use an AFM (atomic force microscope) to adjust the longitudinal direction of the fiber along the vertical axis, and output an image of length × width × height = 5000 nm × 5000 nm × 400 nm, This was expanded to a size of vertical x horizontal x height = 95 mm x 180 mm x 77 mm, and the vertical, horizontal, and height were defined as Y, X, and Z axes, respectively. Observe the horizontal axis cut surface at Y = 0 and Y = 5000 nm in this image, and at least one cut surface is a continuous convex part sandwiched by valleys having a height difference of 10 nm or more as a streaky part, All the specified streaks passed through the peak at the cut surface of either Y = 0 or Y = 5000 nm, and straight lines parallel to the Y axis were drawn, and the distance between the straight lines was defined as the distance between the streaks.

  For the height of the streak from the adjacent troughs, select any convex part on the yarn surface plotted on the cut surface of Y = 0 or Y = 5000 nm and the XZ plane, and the convex part A straight line intersecting the section, a straight line L1 (Z = z1), and a straight line L2 (Z = z2 = z1 + 10 nm) are defined, and the point A (x1, z1) as an intersection between the line L1 and the yarn surface, Is a point D (x4, z4 (= z1)) (x4> x1), and among the intersections of the surface of the yarn sandwiched between A and D and L2, the intersections adjacent to point A and point D are point B and point C. Similarly, when the point E (x5, z1) (where x5> x4) and the straight line L3 (Z = z3, z2 ≧ z3> z1) adjacent to the point D among the intersections of the yarn surface and L1 are set, Of the intersection points of the straight line L3 (Z = z3, z2 ≧ z3> z1), the intersection point next to the point E is the point F (x6, z3) (where x6> x5), and the intersection point with the straight line L1 next to the point A is When the point G (x7, z1) (x1> x7) and the straight line L4 (Z = z4, z2 ≧ z4> z1) are set, the intersection H next to the point G is the point of intersection between the yarn surface and L4. It is defined as H (x8, z4) (where x7> x8). A to E and G may be independently A = G, B = C, and D = E. That is, the intersections of the yarn surface with the straight lines L1, L2, L3, and L4 are point H (x8, z4), point G (x7, z1), point A (x1, z1), and point B (x2) on the yarn surface. , Z2), point C (x3, z2), point D (x4, z1), point E (x5, z1), point F (x6, z3) (x8 <x7 ≦ x1 <x2 ≦ x3 <x4 ≦ x5 < Points H, G, A, B, C, D, E, and F are defined in the order of x6). When such a relationship is established, the yarn surface between the points H, G, A, B, C, D, E, and F is in a state in which there are convex portions sandwiched between the valleys, and the streaks are Judge that there is.

  The point with the highest height in the Z-axis direction among the points on the surface of the yarn sandwiched between point B and point C is defined as the peak of the streak portion (point C is the peak when B = C). The point with the lowest height in the Z-axis direction among the points on the surface of the yarn to be sandwiched is defined as the bottom of the valley (point D is a peak when D = E). The height of the peak of the streak and the bottom of the valley at this time is defined as the height of the streak on the CD side. Similarly, the height on the AB side of the streak was also measured, and the smaller value was taken as the streak height. According to the above definition, the height is measured by changing the point A for each convex portion.

  The streaks measured in this way have one or more peaks with a maximum height from 10 nm to 300 nm not less than the adjacent valleys, and the distance between the streaks satisfies 100 nm to 1400 nm. Must be distributed.

  When the maximum height of the streaks is less than 10 nm, when water drops are dropped on the fabric, the amount of air contained between the valleys of the fibers and the water drops is small, and some water repellency can be obtained, but this alone It is difficult to develop sufficient water repellency when used as a fabric. On the other hand, when the maximum height of the streaks exceeds 300 nm, the cross-sectional shape of the fiber becomes unstable, and the spinnability is lowered.

  Further, when the distance between the streaks is less than 100 nm, when water drops are dropped on the fabric, the amount of air contained between the troughs of the fibers and the water drops is reduced, and the water repellency is lowered. On the other hand, when the distance between the streaks exceeds 1400 nm, when water drops are dropped on the fabric, the density of the streaks supporting the water drops becomes too low, resulting in a decrease in water repellency.

  Accordingly, it is preferable that 90% or more of the streaks to be observed satisfy the maximum height of the streaks and the distance between the streaks, and more preferably all the streaks satisfy. It is that.

  The most suitable method for forming such streaks on the surface of the yarn is to blend different polymers so that the melt-spun yarn has a sea-island polymer alloy cross section. Other methods, that is, forming a fine streak at high density on the fiber surface by spinning with a single-shaped material using a modified cross-section die or reducing the weight of a composite yarn It is very difficult because it exceeds the limits of accuracy and weight loss control.

  Hereinafter, the principle that the polymer alloy yarn has the streaks will be described.

  In the process of forming the yarn by discharging the blended polymer from the base, the polymer pushed into the narrow base hole passes through the hole while receiving a strong compressive force, and releases the compressive force immediately after being discharged from the base hole. To do.

  On the other hand, shear stress is also acting on the alloy polymer in the base hole between the wall surface of the base hole, and the island component of the alloy polymer is elongated in the polymer traveling direction due to the shear stress. In addition, the interfacial tension due to the difference in solubility parameter of each polymer also works between the polymers, so the alloy polymer contraction force works to minimize this interfacial tension, and shear stress is generated in the die hole. And the contraction force is moving in balance. For this reason, when the alloy polymer is discharged from the die hole, only the shrinkage force acts on the alloy polymer.

  As described above, the alloy polymer discharged from the die hole is subjected to a force from the upstream side of the alloy polymer (compression force) and a force from the downstream side (contraction force) just below the die, so that the alloy polymer moves in a direction perpendicular to the traveling direction. It is discharged while bulging as a whole. This is called a ballast effect.

  At this time, when the fluidity of the sea component is very large relative to the island component of the alloy polymer, the sea component swells larger, so the sea component sandwiched between the island components becomes convex and forms streaks . Therefore, in the region where the density of the island component is moderately low, protrusions tend to occur, and as the density of the island component increases, the island component is more difficult to be raised and the protrusions are less likely to be raised. The height of the streak portion tends to increase, and as the density increases, the streak portion decreases, and if it is too high, almost no bulging occurs, resulting in the formation of valleys.

  Therefore, as a combination of polymers, it is preferable that the sea component has higher fluidity at the time of melting than the island component, and polymers having different solubility parameters and different fluidity at the time of melting are combined.

  However, when polymers having too different solubility parameters are combined, the shrinkage force due to the ballast effect becomes too large, and the spinnability is extremely lowered, which may make spinning difficult. In such a case, an appropriate amount of a compatibilizing agent can be added to stabilize the spinnability. As a compatibilizing agent used in such a case, another polymer having good compatibility with both polymers may be used, or a function having affinity and reactivity with the other polymer based on either polymer. A polymer in which a group or the like is introduced by copolymerization or other methods may also be used.

  Regarding the addition method, the sea component and the island component may be mixed at the same time, or the sea component and the island component may be mixed in advance and then side fed into the extruder.

  As described above, minute streaks can be formed at high density on the fiber surface.

  Moreover, it is preferable that the fiber of this invention has the micro projection part other than the said streaky part. This is because the double uneven structure of the streaks and minute protrusions has the effect of increasing the specific surface area of the fiber and increasing the lotus leaf effect. The minute protrusion at this time is adjusted so that the longitudinal direction of the fiber is along the vertical axis using an AFM (Atomic Force Microscope), and an image of length × width × height = 1000 nm × 1000 nm × 100 nm is output, An image obtained by enlarging this to vertical x horizontal x height = 95 mm x 180 mm x 77 mm is used to measure the height of minute protrusions and the number of pieces on the Y = 0 cut surface.

  In the present invention, as a result of the above measurement, the maximum height from both adjacent valleys has one or more peaks of 2 nm or more and less than 10 nm, and the distance between ridgelines or vertex distances of adjacent minute streaks or protrusions Is preferably 10 nm or more and less than 100 nm.

  Next, as the polymer used in the present invention, in order to achieve both dyeability and water repellency, at least one of the alloy polymers is preferably a dyeable polymer, and more preferably, the sea component is a dyeable polymer. That is.

  In the above, the dyeable polymer A is not particularly limited as long as it is a dyeable polymer. Specifically, the dyeable polymer is preferably polyamide, polyester, cellulose, acrylic, polyurethane, polyolefin, and the like. Polyamide 6, polyamide 6,6, polyamide 6,10, polyethylene terephthalate and polylactic acid are preferred, and polyamide 6 is most preferred in view of control of the melting point and fluidity of the polymer.

  In addition, as the other polymer B, a polymer different from that used as the dyeable polymer, which may be a fiber defined in the present invention, may or may not be dyeable. It is preferable that the polymer is a water-repellent or hydrophobic polymer for the purpose of assisting in improving the water repellency at a portion where the polymer is exposed on the fiber surface between the streaks. Specifically, polyolefin resins, fluororesins, silicone resins and the like can be preferably exemplified. More preferred are polyolefins (especially preferably polyethylene, polypropylene, etc.) and ethylene-tetrafluoroethylene, and polypropylene is most preferred in view of control of the melting point and fluidity of the polymer.

  Among them, it is preferable to use polyamide as the dyeable polymer and polyolefin as the other polymer.

  In addition, these polymers include a matting agent such as titanium dioxide, various functional particles such as silicon oxide and kaolin, as well as an anti-coloring agent, a stabilizer, and an antioxidant within the scope of the present invention. You may contain additives, such as an agent.

In the fiber of the present invention, the MFR: X of the sea component and the MFR: Y of the island component preferably satisfy the following formula (1).
Formula (1) 7 <= X / Y <= 37

  When X / Y is greater than 37, the fluidity of the island component is relatively low with respect to the fluidity of the sea component. It causes a decrease in yarn properties. On the other hand, if it is less than 7, the fluidity of the island component is too high relative to the fluidity of the sea component, so that it is difficult to form a stable sea-island structure, causing a decrease in spinnability. If it is the said range, even if a spinnability will fall by a ballast effect, a spinnability can be easily controlled by adding a compatibilizer suitably.

  In the above, MFR uses the apparatus according to JISK7210 (1999), and let the value of the melt mass flow rate measured on the conditions of temperature: 250 degreeC and load: 2160g weight be the representative value of MFR of the polymer.

  The melt mass flow rate of each component is preferably 150 to 250 g / 10 min for the sea component and 4.5 to 30 g / 10 min for the island component.

  Moreover, it is preferable to blend the alloy polymer comprising these polymers so that the volume of the sea component is increased in order to stabilize the sea / island structure.

  As the compatibilizing agent, as described above, another polymer having good compatibility with both polymers constituting the polymer blend fiber, or a functional group having affinity and reactivity with the other polymer based on either polymer. And the like by copolymerization or other methods, and may be appropriately selected depending on the polymer used for the polymer blend. For example, when the sea component is polyamide and the island component is polyolefin, the polyolefin is grafted with a functional group having reactivity with nylon, specifically maleic anhydride, acrylic acid, epoxy group, oxazoline group, etc., especially maleic anhydride Modified polyolefins such as polyolefin grafted with acid, acrylic acid, epoxy group, oxazoline group and the like are preferable, and maleic anhydride-modified polypropylene, maleic anhydride, and acrylic acid-modified polypropylene are more preferable. It is preferable to use polyamide as the sea component, polypropylene as the island component, and a modified polypropylene such as maleic anhydride-modified polypropylene, maleic anhydride, or acrylic acid-modified polypropylene as the compatibilizing agent.

  In the present invention, it is preferable that the island component, the sea component, and the compatibilizer to be added if necessary are close to the melting point in consideration of melting simultaneously. In addition, the island component and the sea component, and the compatibilizer added as necessary, can be mixed at any stage prior to spinning. Alternatively, it can be performed by a method in which individually weighed materials are continuously put into an extruder and melt kneaded.

  Moreover, it is preferable that it is the range of 80 / 20-60 / 40 by weight ratio about the compounding ratio of the polymer which comprises the sea component before adding a compatibilizer, and the polymer which comprises an island component. If the sea component is too much, the density of the streaks on the surface of the yarn is lowered, and the water repellency is lowered. On the other hand, when there are too many island components, the ballast becomes too large and the yarn spinnability deteriorates, making it difficult to produce stably. The amount of the compatibilizer added is preferably 0.5 to 5% by weight and more preferably 1 to 3% by weight with respect to the total weight of the sea and island components. The appropriate amount depends on the amount and type of functional groups contained in the compatibilizer, but if the amount is too small, the effect of suppressing the ballast is small and the string spinnability deteriorates, making it difficult to produce stably. When the amount is too large, the sea component or / and the island component react with the compatibilizer too much, so that the polymer thickens and it is difficult to produce stably.

  The resin obtained in this way is discharged from a base having a polymer discharge portion formed as a straight hole, cooled, and after lubrication and converging, it is taken up by a take-up roller and continuously stretched as it is, or The fiber of the present invention is obtained by winding once and drawing in a separate step, and then winding on a bobbin.

  At this time, when melt spinning a polymer having a large ballast for the base to be used, in order to improve the spinnability, the ball diameter is generated by expanding the diameter of the most downstream part of the polymer discharge hole. However, in the present invention, since the fibers are streaked due to the ballast effect, such a die is not used, and a so-called straight die having a straight shape of the polymer discharge hole is used. It is preferable.

  The product of the take-up speed of the take-up roller and the draw ratio is preferably 2000 or more and 5000 or less. This is because when the product of the take-up speed and the draw ratio is less than 2000, the orientation of the fibers does not advance, and the strength of the obtained fibers becomes small. In addition, when the product of the take-up speed and the draw ratio exceeds 5000, the streaks formed on the yarn discharged from the die become smaller during the take-up and drawing process, and this value becomes too large. This is because the water repellency is lowered. More preferably, the above conditions are satisfied, the take-up speed is 2000 m / min or more and 4000 m / min or less, and the draw ratio is 1.0 to 2.5 times.

  The spinning method and form of the fiber are not particularly limited, and any of long fiber, short fiber, and spinning may be used.

  Further, false twisting may be performed subsequent to spinning.

  The fineness of the fiber and the number of filaments are not particularly limited, and can be any shape depending on the use of the fabric from which the cross-sectional shape can be obtained. For example, in addition to the circular shape, a triangular shape, a flat shape, a star shape, a V shape, etc. Although it may be a cross-section or a hollow cross-section thereof, considering that it is used as a textile material for clothing, the fineness is 8 to 235 dtex, the number of filaments is 1 to 144 filaments, the cross-sectional shape is circular, flat, Tripod, star shape and elliptical octalobe are preferred.

  The fibers of the present invention thus obtained have extremely excellent water repellency and can be dyed by the same method as ordinary dyeable fibers. It is suitably used as a textile material.

  EXAMPLES Hereinafter, although an Example is given and this invention is demonstrated further more concretely, this invention is not limited to these Examples. In addition, the part and% in an Example and a comparative example show a weight part and weight%, respectively. In addition, the measuring method of the characteristic value in an Example, etc. are as follows.

(1) Identification of streaks Using an AFM (atomic force microscope, NanoScope IIIa AFM manufactured by Bruker AXS Digital Instruments), the longitudinal direction of the fiber is adjusted along the vertical axis, and the length × width × height = 5000 nm. Output an image of × 5000 nm × 400 nm, and use an image obtained by enlarging the image to length × width × height = 95 mm × 180 mm × 77 mm, and observe the transverse axis cut surface at Y = 0 and Y = 5000 nm in the image. All the connected convex portions sandwiched by valleys having a height difference of 10 nm or more in at least one cut surface were defined as streak portions.

(2) Measurement of the distance and height of the streaks For each of the streaks identified as described above, a straight line parallel to the Y axis is drawn through the peak at either Y = 0 or Y = 5000 nm, The distance between the straight lines was taken as the distance between the streaks.

  For the height of the streak from the adjacent troughs, select any convex part on the yarn surface plotted on the cut surface of Y = 0 or Y = 5000 nm and the XZ plane, and the convex part A straight line intersecting the section, a straight line L1 (Z = z1), and a straight line L2 (Z = z2 = z1 + 10 nm) are defined, and the point A (x1, z1) as an intersection between the line L1 and the yarn surface, Is a point D (x4, z4 (= z1)) (x4> x1), and among the intersections of the surface of the yarn sandwiched between A and D and L2, the intersections adjacent to point A and point D are point B and point C. Similarly, when the point E (x5, z1) (where x5> x4) and the straight line L3 (Z = z3, z2 ≧ z3> z1) adjacent to the point D among the intersections of the yarn surface and L1 are set, Of the intersection points of the straight line L3 (Z = z3, z2 ≧ z3> z1), the intersection point next to the point E is the point F (x6, z3) (where x6> x5), and the intersection point with the straight line L1 next to the point A is When the point G (x7, z1) (x1> x7) and the straight line L4 (Z = z4, z2 ≧ z4> z1) are set, the intersection H next to the point G is the point of intersection between the yarn surface and L4. It is defined as H (x8, z4) (where x7> x8). A to E and G may be independently A = G, B = C, and D = E. That is, the intersections of the yarn surface with the straight lines L1, L2, L3, and L4 are point H (x8, z4), point G (x7, z1), point A (x1, z1), and point B (x2) on the yarn surface. , Z2), point C (x3, z2), point D (x4, z1), point E (x5, z1), point F (x6, z3) (x8 <x7 ≦ x1 <x2 ≦ x3 <x4 ≦ x5 < Points H, G, A, B, C, D, E, and F are defined in the order of x6). When such a relationship is established, the yarn surface between the points H, G, A, B, C, D, E, and F is in a state in which there are convex portions sandwiched between the valleys, and the streaks are Judge that there is.

  The point with the highest height in the Z-axis direction among the points on the surface of the yarn sandwiched between point B and point C is defined as the peak of the streak portion (point C is the peak when B = C). The point with the lowest height in the Z-axis direction among the points on the surface of the yarn to be sandwiched is defined as the bottom of the valley (point D is a peak when D = E). The height of the peak of the streak and the bottom of the valley at this time is defined as the height of the streak on the CD side. Similarly, the height on the AB side of the streak was also measured, and the smaller value was taken as the streak height. According to the above definition, the height is measured by changing the point A for each convex portion.

(3) Measurement of MFR Using an apparatus according to JIS K7210 (1999), the average value of the melt mass flow rate measured twice under the conditions of temperature: 250 ° C. and load: 2160 g weight is representative of MFR of the polymer. Value.

(4) Manufacture of tubular knitted fabric Two polyamide fibers of 57 dtex were combined, and it was carried out with a tubular knitting machine so as to obtain 40 to 55 stitches.

(5) Refining and dyeing of the tubular knitted fabric 100 ml of a 2 g / l aqueous solution of the nonionic surfactant (Neugen SS manufactured by Daiichi Kogyo Seiyaku Co., Ltd.) is prepared for the tubular knitted fabric obtained above at 60 ° C After washing for 30 minutes, it is washed with running water for 20 minutes and dehydrated with a dehydrator.

  Next, an acid dye (xylene first blue manufactured by Kanto Kagaku Co., Ltd.) was dyed at a temperature of 90 ° C. for 60 minutes using an aqueous solution having a concentration of 0.28% owf.

(6) Drying of tubular knitted fabric The tubular knitted fabric dyed in (5) above was dried for 2 hours in a hot air dryer set at 70 ° C. and then allowed to cool at room temperature for 12 hours or more.

(7) Measurement of water repellency After the knitted fabric is refined, dyed and dried by the methods (5) to (6) above, 0.1 cc of water is dropped onto the knitted fabric with a dropper from a distance of 5 mm in height. To do. One hour after dropping, the state of the knitted fabric was visually observed, and if water droplets did not penetrate the knitted fabric, it was judged that there was water repellency.

(8) Fineness A fiber is set on a measuring instrument of 1 m / circumference and rotated 100 times to create a 100-turn loop skein. The sample was conditioned for 24 hours in an environment of 25 ° C. and RH 55% with no load. Thereafter, in the same environment, the fiber fineness was calculated by multiplying the value obtained by measuring the weight of the looped skein by 100.

Example 1
MFR = 177.0 Nylon 6 polymer pellets dried to a moisture content of 0.1%, MFR = 3.9 g / 10 min polypropylene polymer pellets ("Novatec" FY6 made by Nippon Polypro) and compatibilization While measuring maleic anhydride-modified polypropylene (“Toyo Tac” PMA-H1100P, manufactured by Toyobo Co., Ltd.) as an agent at 65/35/3, it was rotated at 250 ° C. with a twin-screw extruder (TEM 26SS, manufactured by Toshiba Machine Co., Ltd.). Melting is performed at several 300 rpm, the molten polymer is guided to a spinning machine at 270 ° C., and the yarn is discharged through a die. Thereafter, the yarn was taken up at 2260 m / min according to a conventional method, and subsequently heat-set at 110 ° C. while being drawn at 3620 m / min (drawing ratio 1.6 times, take-off speed and draw ratio product 3616), and subsequently 3500 m Winding at a rate of 50 minutes per minute, a polyamide long fiber of 57 dtex and 26 filaments was obtained.

  The result of having observed the obtained fiber in AFM is shown in FIGS. According to FIG. 1, the fiber surface has streak portions having a peak height distributed in the range of 13 nm to 62 nm, and the distance between the streaks was all distributed in the range of 332 nm to 1163 nm. According to FIG. 2, 15 microprojections of 2.0 to 8.5 nm were distributed.

  As a result of checking the water repellency after knitting, refining, dyeing and drying the fiber, the fiber showed good water repellency.

Example 2
A 57 dtex, 26-filament polyamide long fiber was obtained in the same manner as in Example 1 except that maleic anhydride and acrylic acid-modified polyethylene (“Bondaine” AX8390 manufactured by Arkema Co., Ltd.) were used as compatibilizing agents.

As a result of observing the obtained fiber with AFM, the fiber surface has a streak portion having a peak height distributed in the range of 29 nm to 284 nm, and the distance between the streaks is distributed in the range of 616 nm to 1386 nm. Was.
Nine fine protrusions of 2.7 to 5.3 nm were distributed.

  As a result of knitting the fiber and confirming the water repellency after deoiling and drying, the fiber showed good water repellency.

Example 3
A 57 dtex, 26 filament polyamide long fiber was obtained in the same manner as in Example 1, except that maleic anhydride-modified polypropylene ("Modic" P928 manufactured by Mitsubishi Chemical Corporation) was used as the compatibilizing agent.

  As a result of observing the obtained fiber by AFM, the fiber surface has a streak portion having a peak height distributed in the range of 11 nm to 241 nm, and the distance between the streaks is distributed in the range of 270 nm to 1194 nm. Was.

  In addition, 11 fine protrusions having a diameter of 2.7 to 7.1 nm were distributed.

  As a result of knitting the fiber and confirming the water repellency after deoiling and drying, the fiber showed good water repellency.

Example 4
A 57 dtex, 26-filament polyamide long fiber was obtained in the same manner as in Example 1, except that polypropylene ("Prime Polypro" J106G: MFR = 25.4 g / 10 min, manufactured by Prime Polymer Co., Ltd.) was used.

  As a result of observing the obtained fiber with AFM, the fiber surface has a streak portion having a peak height distributed in the range of 21 nm to 78 nm, and the distance between the streaks is distributed in the range of 111 nm to 914 nm. Was.

  In addition, 22 fine protrusions of 2.0 to 8.5 nm were distributed.

  As a result of knitting the fiber and confirming the water repellency after deoiling and drying, the fiber showed good water repellency.

Example 5
A 57 dtex, 26 filament polyamide long fiber was obtained in the same manner as in Example 1 except that the weight ratio of nylon 6, polypropylene and compatibilizer was 60/40/3.

  As a result of observing the obtained fiber with AFM, the fiber surface has a streak portion having a peak height distributed in the range of 15 nm to 82 nm, and the distance between the streaks is distributed in the range of 286 nm to 1052 nm. Was.

    Nine fine protrusions of 2.7 to 9.1 nm were distributed. As a result of knitting the fiber and confirming the water repellency after deoiling and drying, the fiber showed good water repellency.

Example 6
Same as Example 1 except that the weight ratio of nylon 6, polypropylene, and compatibilizer was 80/20/3, and polypropylene ("Prime Polypro" J106G: MFR = 25.4 g / 10 minutes manufactured by Prime Polymer Co., Ltd.) was used. Thus, a 57 dtex, 26 filament polyamide long fiber was obtained.

  As a result of observing the obtained fiber with AFM, the fiber surface has a streak portion whose peak height is distributed in the range of 18 nm to 52 nm, and the distance between the streaks is distributed in the range of 153 nm to 785 nm. Was.

  In addition, 18 fine protrusions of 2.0 to 7.8 nm were distributed.

  As a result of knitting the fiber and confirming the water repellency after deoiling and drying, the fiber showed good water repellency.

Comparative Example 1
A 57 dtex, 26-filament polyamide long fiber was melt spun in the same manner as in Example 1 except that polypropylene ("Novatec" EA8W: MFR = 1.37 g / 10 min. Manufactured by Nippon Polypro Co., Ltd.) was discharged from the die. The polymer cut immediately after cutting, and sampling of the yarn was impossible.

Comparative Example 2
A 57 dtex, 26 filament polyamide long fiber was melt-spun in the same manner as in Example 1 except that polypropylene ("Prime Polypro" ZS1337A: MFR = 40.1) manufactured by Prime Polymer Co., Ltd. was discharged from the die. The polymer was cut shortly and yarn sampling was impossible.

Comparative Example 3
Except that no compatibilizer was added, a 57 dtex, 26 filament polyamide continuous fiber was melt spun in the same manner as in Example 1, but the polymer discharged from the die was cut immediately, and the sampling of the yarn was It was impossible.

Comparative Example 4
Polypropylene ("Prime Polypro" S119 manufactured by Prime Polymer Co., Ltd.) is melted at 190 ° C with a rotation speed of 300rpm with a twin screw extruder (TEM26SS manufactured by Toshiba Machine Co., Ltd.), and the molten polymer is guided to a spinning machine at 220 ° C through a die. The yarn is discharged. In the following manner, according to a conventional method, the yarn was drawn at 2260 m / min, subsequently stretched at 3620 m / min and then heat-set at 110 ° C., and subsequently wound at 3500 m / min to obtain 45 dtex, 26 filaments of polypropylene long fiber. Obtained. As a result of observing the obtained fiber with AFM, only one streak having a peak with a height of 35 nm on the fiber surface was possessed.

  As a result of knitting the fiber and confirming the water repellency after deoiling and drying, it showed no water repellency.

Claims (7)

  A polymer alloy fiber comprising a dyeable polymer A and another polymer B and having a sea-island structure, and has a plurality of streaks arranged in the longitudinal direction of the fiber on the fiber surface. A fiber comprising a thermoplastic resin having one or more peaks having a maximum height from a valley of 10 nm to 300 nm and a distance between streaks of 100 nm to 1400 nm.   2. The fiber according to claim 1, wherein the polymer alloy fiber has a sea-island structure, wherein the dyeable polymer is a sea component and the other polymer is an island component. The polymer alloy fiber has a sea-island structure, and among the dyeable polymer A and other polymers B, the polymer constituting the sea component has a melt mass flow rate (MFR) X and the polymer constituting the island component. The fiber according to claim 1, wherein the melt mass flow rate (MFR) Y of the fiber satisfies the following formula (1).
Formula (1) 7 <= X / Y <= 37   4. The fiber according to claim 1, wherein the dyeable polymer is polyamide and the other polymer is polyolefin.   Among the polymers A and B, the weight ratio of the polymer constituting the sea component and the polymer constituting the island component is mixed at 80/20 to 60/40, and further, with respect to the total weight of the two polymers, The fiber according to any one of claims 1 to 2, wherein a compatibilizer is added in an amount of 0.5 to 5% by weight.   A water-repellent fabric comprising the fiber according to claim 1. When the dyeable polymer A and the other polymer B are mixed and melt-spun to produce a polymer alloy fiber having a sea-island structure, the sea component of the dyeable polymer A and the other polymer B is constituted. A dyeable polymer A such that the melt mass flow rate (MFR) X of the other polymer and the melt mass flow rate (MFR) Y of the island component satisfy the following formula (1) are used, and other polymers B are used. The manufacturing method of the fiber in any one of Claims 1-5 characterized by the above-mentioned.
Formula (1) 7 <= X / Y <= 37

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