High-strength fiber

Abstract

Provided is a high-strength fiber having excellent wear resistance. The high-strength fiber is obtained by adhering a wax and a polysiloxane having a viscosity of 5000 mPa.sec or more to the surface of the fiber, and when the surface is imaged by time-of-flight secondary ion mass spectrometry (TOF-SIMS), in a measurement region obtained from a single-color image of 256 gray scale obtained by graying the ion strength derived from the polysiloxane, the surface of the high-strength fiber is subjected to a time-of-flight secondary ion mass spectrometry (TOF-SIMS), and the surface of the high-strength fiber is subjected to a time-of-flight secondary ion mass spectrometry (TOF-SIMS). The number of pixels (excluding 0 gradation and 255 gradation) extracted as polysiloxane-derived ion attachment parts is 60% or more with respect to the total number of pixels constituting the measurement region.

Description

[0001] This application claims priority to Japanese Patent Application 2023-105720, filed on June 28, 2023, the entire contents of which are incorporated herein by reference. Technical Field

[0002] This invention relates to high-strength fibers with high-viscosity polysiloxanes attached to the fiber surface in a specific attachment pattern. Background Technology

[0003] To form high-strength fibers, molecules are typically aligned as parallel to the fiber axis as possible, imparting a high degree of crystallinity. On the other hand, since most high-strength fibers are prone to wear due to high crystallinity and easily produce fibrils, there is a problem in improving their wear resistance.

[0004] For example, Patent Document 1 (Japanese Patent Application Publication No. 10-237767) discloses an abrasion-resistant fiber in which a treatment agent, at a weight of 4 to 10% by weight based on the fiber weight, is moltenly attached to the fiber surface. In this treatment agent, a hydrocarbon wax with a melting point of 50 to 90°C accounts for more than 80% by weight of the effective components. Furthermore, this document also describes that the treatment agent contains at least 20% by weight of a polysiloxane with a viscosity of 5 to 80 centistokes at 25°C, based on the effective components of the treatment agent.

[0005] In addition, Patent Document 2 (Japanese Patent Publication No. 2009-527661) discloses a rope whose fatigue resistance to repeated bending of pulleys (CBOS) is improved. The rope contains high-toughness fibers, and the rope and / or the fibers are coated with a composition containing an amino-functional silicone resin and neutralized low molecular weight polyethylene.

[0006] Existing technical documents

[0007] Patent documents

[0008] Patent Document 1: Japanese Patent Application Publication No. 10-237767

[0009] Patent Document 2: Japanese Patent Publication No. 2009-527661 Summary of the Invention

[0010] The problem that the invention aims to solve

[0011] However, although Patent Document 1 describes the use of polysiloxane with a viscosity of 5 to 80 centistokes as the active ingredient of the treatment agent, there is a problem that such a treatment agent, in the case of high molecular weight organosilicon, cannot be fully adhered to the fiber surface.

[0012] Furthermore, while Patent Document 2 describes a combination of amino-functionalized silicone resin and neutralized low molecular weight polyethylene, it does not provide any detailed information about the amino-functionalized silicone resin. Additionally, it does not demonstrate that the wear resistance under repeated bending can be maintained over a long period.

[0013] Therefore, the object of the present invention is to provide a high-strength fiber that can maintain abrasion resistance for a long time.

[0014] Problem Solving Methods

[0015] In order to solve the problems of the prior art, the inventors conducted repeated in-depth research and found that when wax and a specific high-viscosity polysiloxane are attached to the fiber surface, if the polysiloxane is attached to the fiber surface in a specific attachment pattern, although the reason is uncertain, the polysiloxane and wax produce a synergistic effect, which can maintain the wear resistance of the fiber for a long time, thus completing the present invention.

[0016] That is, the present invention can be constructed in the following ways.

[0017] [Method 1]

[0018] A high-strength fiber, wherein the fiber surface is coated with wax and has a viscosity of 5000 mPa·s or more (preferably 8000 mPa·s or more and 1,000,000 mPa·s or less, more preferably 10000 mPa·s or more and 700,000 mPa·s or less, further preferably 15000 mPa·s or more and 500,000 mPa·s or less, particularly preferably 20000 mPa·s or more and 500,000 mPa·s or less, and especially preferably 100,000 mPa·s or more and 450,000 mPa·s or less). When the polysiloxane described below is imaged using time-of-flight secondary ion mass analysis (TOF-SIMS), for the measurement area obtained from a monochrome image of 256 gray levels (0 gray level to 255 gray level) obtained by graying the ion intensity originating from the polysiloxane, the number of pixels extracted as ion attachment portions originating from the polysiloxane (excluding 0 gray level and 255 gray level; that is, 1 to 254 gray level) relative to the total number of pixels constituting the measurement area is 60% or more (preferably 65% ​​or more, more preferably 70% or more).

[0019] [Method 2]

[0020] According to the high-strength fiber described in method 1, wherein...

[0021] When performing TOF-SIMS imaging on the above-mentioned surface, for the measurement area obtained from a monochrome image of 256 gray levels (0 gray level to 255 gray level) obtained by graying the ion intensity from the above-mentioned wax, the number of pixels extracted as ion attachment parts from the wax (excluding 0 gray level and 255 gray level; that is, 1 to 254 gray level) relative to the total number of pixels constituting the measurement area is 40% or more (preferably 45% or more, more preferably 50% or more).

[0022] [Method 3]

[0023] According to method 1 or 2, the high-strength fiber, wherein,

[0024] The fineness of a single fiber is 0.5~500 dtex (preferably 1.0~300 dtex).

[0025] [Method 4]

[0026] The high-strength fiber described in any of methods 1 to 3 is a multifilament.

[0027] [Method 5]

[0028] The high-strength fiber according to any one of methods 1 to 4, wherein...

[0029] The adhesion ratio of polysiloxane to wax is 20 / 80 to 90 / 10 (preferably 30 / 70 to 85 / 15) based on polysiloxane / wax.

[0030] [Method 6]

[0031] The high-strength fiber according to any one of methods 1 to 5, wherein...

[0032] The wax is an ester wax.

[0033] [Method 7]

[0034] The high-strength fiber according to any one of methods 1 to 6, wherein...

[0035] The melting point of the wax is 50~100℃ (preferably 55~100℃, more preferably 60~90℃).

[0036] [Method 8]

[0037] According to any one of methods 1 to 7, the high-strength fiber, wherein,

[0038] Based on the fiber weight, the total amount of wax and polysiloxane is 1% by weight or more (preferably 2% by weight or more).

[0039] [Method 9]

[0040] The high-strength fiber according to any one of methods 1 to 8, wherein,

[0041] The high-strength fiber is selected from at least one of ultra-high molecular weight polyethylene fiber, aramid fiber, and liquid crystal polyester fiber.

[0042] [Method 10]

[0043] A high-strength fiber has wax and a polysiloxane with a viscosity of 5000 mPa·s or higher attached to its surface. The attachment rate of the polysiloxane is 0.5% by weight or more (preferably 1.0% by weight or more, more preferably 1.5% by weight or more, even more preferably 2.0% by weight or more, and even more preferably 2.5% by weight or more) based on the weight of the fiber.

[0044] [Method 11]

[0045] The high-strength fiber described in any of methods 1 to 10 is used in ropes.

[0046] [Method 12]

[0047] A fiber structure comprising high-strength fibers as described in any of embodiments 1 to 11.

[0048] [Method 13]

[0049] A rope comprising high-strength fibers as described in any of embodiments 1 to 11.

[0050] It should be noted that, unless otherwise specified, the term "high-strength fiber" in this specification refers to fibers with an oil coating on their surface. A high-strength fiber consists of a fiber body and a surface coating formed on the fiber body. The fiber body is primarily composed of a resin capable of forming high-strength fibers, and the surface coating includes oil components such as polysiloxanes and waxes, which will be described later.

[0051] It should be noted that in this specification, the term "based on fiber weight" refers to the weight of the fiber in a state where it is coated with wax and polysiloxane.

[0052] In this specification, unless explicitly stated otherwise, the singular forms “a,” “an,” and “the” refer to the plural form containing “at least one.” In this specification, the terms “and / or,” “at least one,” and “more than one” include any and all combinations of the relevant listed items.

[0053] It should be noted that any combination of at least two constituent elements disclosed in the claims and / or description and / or drawings is also included in this invention. In particular, any combination of two or more claims recited in the claims is also included in this invention.

[0054] The effects of the invention

[0055] In this invention, because polysiloxane is attached to the fiber surface in a specific adhesion pattern, the wear resistance of the fiber can be improved. That is, wear caused by repeated friction can be suppressed. Attached Figure Description

[0056] The present invention can be more clearly understood through the following description of preferred embodiments with reference to the accompanying drawings. However, the embodiments and drawings are for illustration and description only and should not be used to limit the scope of the invention. The scope of the invention is defined by the appended claims.

[0057] Figure 1 This is an image showing the degree of adhesion of the polysiloxane to the high-strength fibers obtained in Example 1.

[0058] Figure 2 This is a schematic diagram illustrating a method for measuring the wear characteristics of high-strength fibers obtained in the examples and comparative examples. Detailed Implementation

[0059] As a high-strength fiber, any fiber with a tensile strength of 7 cN / dtex or higher is acceptable; there are no particular limitations. Specific examples include fibers containing various resins (hereinafter sometimes simply referred to as high-strength resins) capable of forming high-strength fibers, such as: liquid crystal polyester fibers (Kuraray Co., Ltd.'s Vectran UM (trademark), Kuraray Co., Ltd.'s Vectran HT (trademark), Toray Industries, Ltd.'s Siveras (trademark), and KB SEIREN Co., Ltd.'s Zxion (trademark), etc.), ultra-high molecular weight polyethylene fibers (Toyobo Co., Ltd.'s Izanas (trademark), DSM Co., Ltd.'s Dyneema (trademark), etc.), and aromatic polyamide fibers (such as DU, a poly(p-phenylene terephthalamide) fiber). Kevlar (trademark) manufactured by PONT-TORAY, Twaron (trademark) manufactured by Teijin Corporation, Technora (trademark) manufactured by Teijin Corporation as a copolymer of terephthaloyl(3,4'-oxodiphenylene)-p-phenylenediamine fiber, etc., and poly(p-phenylene benzo[2]) Fibers formed from pyrazole (PBO) (such as Xyron (trademark) manufactured by Toyobo Co., Ltd., etc.). Among them, liquid crystal polyester fiber is preferred.

[0060] Liquid crystal polyester fibers can be manufactured, for example, by melt spinning liquid crystal polyester and further solid-state polymerization of the spinning precursor as needed.

[0061] Liquid crystal polyesters are polyesters that exhibit optical anisotropy (liquidity) in the molten phase. This can be identified, for example, by heating the sample on a heating stage under a nitrogen atmosphere and observing the transmitted light of the sample using a polarizing microscope. Furthermore, liquid crystal polyesters are formed from structural units derived from, for example, aromatic diols, aromatic dicarboxylic acids, and aromatic hydroxycarboxylic acids. The chemical composition of these structural units is not particularly limited as long as it does not impair the effects of the present invention. Moreover, to the extent that it does not impair the effects of the present invention, liquid crystal polyesters may contain structural units derived from aromatic diamines, aromatic hydroxyamines, or aromatic aminocarboxylic acids.

[0062] For example, the examples shown in Table 1 can be cited as preferred structural units.

[0063] [Table 1]

[0064]

[0065] (Where, X in the formula is selected from the following structure)

[0066]

[0067] (Where, m = 0~2, Y = substituents selected from hydrogen, halogen atom, alkyl, aryl, aralkyl, alkoxy, aryloxy, and aralkyloxy)

[0068] Here, Y exists in the range of 1 to the maximum number that can be substituted in the aromatic ring, and each is independently selected from hydrogen atoms, halogen atoms (e.g., fluorine atoms, chlorine atoms, bromine atoms, iodine atoms, etc.), alkyl (e.g., methyl, ethyl, isopropyl, tert-butyl, etc., alkyl with 1 to 4 carbon atoms, etc.), alkoxy (e.g., methoxy, ethoxy, isopropoxy, n-butoxy, etc.), aryl (e.g., phenyl, naphthyl, etc.), aralkyl [benzyl (phenylmethyl), phenethyl (phenylethyl) etc.], aryloxy (e.g., phenoxy, etc.), and aralkyloxy (e.g., benzyloxy, etc.).

[0069] As a more preferred structural unit, examples (1) to (18) shown in Tables 2, 3 and 4 below can be cited. It should be noted that when the structural unit in the formula can represent a structural unit of multiple structures, two or more such structural units can also be combined as structural units constituting the polymer.

[0070] [Table 2]

[0071]

[0072] [Table 3]

[0073]

[0074] [Table 4]

[0075]

[0076] In the structural units of Tables 2, 3, and 4, n is an integer of 1 or 2. Each structural unit n=1 and n=2 can exist alone or in combination. Y1 and Y2 can each independently be a hydrogen atom, a halogen atom (e.g., fluorine atom, chlorine atom, bromine atom, iodine atom, etc.), an alkyl group (e.g., methyl, ethyl, isopropyl, tert-butyl, etc., with 1 to 4 carbon atoms), an alkoxy group (e.g., methoxy, ethoxy, isopropoxy, n-butoxy, etc.), an aryl group (e.g., phenyl, naphthyl, etc.), an aralkyl group [benzyl (phenylmethyl), phenethyl (phenylethyl), etc.], an aryloxy group (e.g., phenoxy, etc.), an aralkyloxy group (e.g., benzyloxy, etc.), etc. Among these, preferred Y1 and Y2 may be hydrogen atoms, chlorine atoms, bromine atoms, or methyl groups.

[0077] In addition, as Z, the substituents shown in the following formula can be listed.

[0078] [Chemical Formula 1]

[0079]

[0080] The liquid crystal polyester is preferably a combination of two or more naphthalene skeletons as structural units.

[0081] The liquid crystal polyester preferably includes both structural units (A) derived from hydroxybenzoic acid and structural units (B) derived from hydroxynaphthoic acid. For example, structural unit (A) can be represented by the following formula (A), and structural unit (B) can be represented by the following formula (B). From the viewpoint of easily improving melt-forming properties, the ratio of structural unit (A) to structural unit (B) is preferably 9 / 1 to 1 / 1, more preferably 7 / 1 to 1 / 1, and even more preferably in the range of 5 / 1 to 1 / 1.

[0082] [Chemical Formula 2]

[0083]

[0084] [Chemical Formula 3]

[0085]

[0086] Furthermore, the total percentage of structural units (A) and (B) relative to all structural units can be 65 mol% or more, more preferably 70 mol% or more, and even more preferably 80 mol% or more. In the polymer, a liquid crystal polyester in which structural units (B) are 4 to 45 mol% is particularly preferred.

[0087] The melting point of the liquid crystal polyester suitable for use in this invention is preferably 250~360℃, more preferably 260~320℃. Here, melting point refers to the temperature of the main absorption peak observed by differential scanning calorimetry (DSC; Made by Mettler-Toledo "TA3000") according to the JIS K7121:2012 test method. Specifically, in the above-mentioned DSC apparatus, 10~20mg of sample is sealed in an aluminum dish, and nitrogen gas is introduced as a carrier gas at 100cc / min, and the endothermic peak is measured when the temperature is increased from room temperature (e.g., 25℃) at 20℃ / min. Depending on the type of polymer, if no clear peak appears in the first run of the DSC measurement, the temperature can be increased to 50°C above the expected flow temperature at a heating rate of 50°C / min, and held at that temperature for 3 minutes. After complete melting, the temperature can be cooled to 50°C at a cooling rate of -80°C / min, and then the endothermic peak can be measured at a heating rate of 20°C / min.

[0088] It should be noted that, without impairing the effects of the present invention, thermoplastic polymers such as polyethylene terephthalate, modified polyethylene terephthalate, polyolefins, polycarbonate, polyamide, polyphenylene sulfide, polyetheretherketone, and fluoropolymers can also be added to the above-mentioned liquid crystal polyester. In addition, various additives such as titanium dioxide, kaolin, silicon dioxide, barium oxide, carbon black, dyes, pigments, antioxidants, ultraviolet absorbers, and light stabilizers can also be added.

[0089] The liquid crystal polyester fiber may contain more than 50% by weight of liquid crystal polyester, preferably more than 80% by weight, more preferably more than 90% by weight, further preferably more than 95% by weight, and even more preferably more than 99.9% by weight.

[0090] High-strength fibers can be either non-composite or composite fibers. Furthermore, there are no particular restrictions on the cross-sectional shape of high-strength fibers; they can be common fibers with a circular cross-section (including cocoon shapes) or fibers with irregular cross-sections other than circular ones. In the case of irregularly shaped cross-section fibers, the cross-sectional shape can be, for example, square, polygonal, triangular, hollow, flat, multi-lobed, cross-shaped, dog-bone shaped, T-shaped, V-shaped, etc. In most cases, irregularly shaped cross-section fibers are non-composite fibers.

[0091] Examples of composite fibers include core-sheath type composite fibers composed of a sheath component and a core component, island-type composite fibers composed of a sea component and an island component, parallel type composite fibers composed of columns of components, and split fibers that increase the surface area of ​​the two components. Furthermore, these constituent components can also have an island structure as needed. Composite fibers can be made using any resin capable of forming composite fibers with any of the constituent components; preferred resins include the aforementioned high-strength resins (e.g., liquid crystal polyester, aromatic polyamide, ultra-high molecular weight polyethylene, PBO, etc.). From the viewpoint of heat resistance, liquid crystal polyester, aromatic polyamide, and PBO are more preferred.

[0092] Preferred composite fibers include: core-sheath type composite fibers with a core component of a high-strength resin (e.g., liquid crystal polyester) and a sheath component of a flexible thermoplastic resin; mixed composite fibers with a core component of a high-strength resin (e.g., liquid crystal polyester) and a sheath component having an island structure, wherein the island component is a flexible thermoplastic resin and the island component is a high-strength resin (e.g., liquid crystal polyester); etc.

[0093] Flexible thermoplastic resins may or may not have aromatic rings in their main chain. Examples include: polyolefins; polyamides; polycarbonates; polyphenylene sulfide (PPS); polyethylene terephthalate, modified polyethylene terephthalate, amorphous polyarylates, polyethylene naphthalate (PEN), and other polyesters; polyetheretherketones; and fluoropolymers. These flexible thermoplastic resins can be used alone or in combination of two or more. They can also be used as the main (e.g., accounting for 80% or more by weight) thermoplastic resin, with other resins added. PPS and PEN are preferred as the main thermoplastic resins.

[0094] In addition, examples of mixed composite fibers that use liquid crystal polyester in the core component, PEN as the sheath component in the sea component, and liquid crystal polyester as the island component include Vecry (trademark) manufactured by Kuraray Co., Ltd.

[0095] High-strength fibers typically have a single fiber fineness of approximately 0.5 to 500 dtex, preferably approximately 1.0 to 300 dtex. From a processability point of view, a single fiber fineness within this range is preferred.

[0096] The high-strength fiber can be a monofilament or a multifilament. When it is a multifilament, the number of filaments can be appropriately selected according to the application, etc. For example, the number of filaments can be 2 to 5,000, preferably 3 to 4,000, more preferably 5 to 3,000, even more preferably 6 to 2,500, and even more preferably 7 to 2,000.

[0097] The high-strength fiber of the present invention refers to a fiber with a strength of 7 cN / dtex or higher, for example, about 8 to 100 cN / dtex, more preferably about 15 to 80 cN / dtex. Furthermore, the elastic modulus of the high-strength fiber can be, for example, about 300 to 2000 cN / dtex, more preferably about 450 to 1500 cN / dtex. The strength and elastic modulus are values ​​measured by the methods described in the examples described later.

[0098] In addition, high-strength fibers may contain inorganic substances such as titanium dioxide, kaolin, silicon dioxide, and barium oxide, as well as colorants such as carbon black, dyes, and pigments, antioxidants, ultraviolet absorbers, light stabilizers, and various additives inside and / or on the fiber surface, as needed.

[0099] (Polysiloxane)

[0100] In the high-strength fiber of the present invention, a polysiloxane with a viscosity of 5000 mPa·s or higher is adhered to the fiber surface. The high viscosity polysiloxane with a viscosity of 5000 mPa·s or higher contributes to the improvement of the wear resistance of the high-strength fiber, and by using it in combination with the wax described later, a synergistic effect is achieved in improving wear resistance.

[0101] The viscosity of the polysiloxane is preferably 8000 mPa·s or more, more preferably 10000 mPa·s or more, even more preferably 15000 mPa·s or more, and particularly preferably 20000 mPa·s or more. Furthermore, from a processability point of view, the viscosity of the polysiloxane is preferably 1000000 mPa·s or less, more preferably 700000 mPa·s or less, and even more preferably 500000 mPa·s or less. The viscosity of the polysiloxane is a value measured by the method described in the examples below. The viscosity of the polysiloxane adhering to the fiber surface can be measured by extracting it from the fiber sample using a solvent appropriate to its type. The viscosity of the polysiloxane can be, for example, 5000 mPa·s or more and 1,000,000 mPa·s or less, preferably 8000 mPa·s or more and 700,000 mPa·s or less, more preferably 10000 mPa·s or more and 500,000 mPa·s or less, further preferably 15000 mPa·s or more and 500,000 mPa·s or less, particularly preferably 20000 mPa·s or more and 500,000 mPa·s or less, and especially preferably 100,000 mPa·s or more and 450,000 mPa·s or less.

[0102] For polysiloxanes, as long as the viscosity at 25°C is above 5000 mPa·s, there are no particular limitations. Examples of polysiloxanes include polydimethylsiloxane or modified polysiloxanes derived from it, such as phenyl-modified polysiloxanes, aminoalkyl-modified polysiloxanes, epoxy-modified polysiloxanes, polyoxyalkylene-modified polysiloxanes, fatty acid-modified polysiloxanes, etc.

[0103] The adhesion state of polysiloxane on the fiber surface can be determined by imaging the fiber surface using time-of-flight secondary ion mass analysis (TOF-SIMS).

[0104] In TOF-SIMS, for a sample introduced into a vacuum, primary ions are irradiated onto the sample from a primary ion source. Subsequently, secondary ions are emitted from the sample surface in accordance with the primary ion irradiation, arriving at the detector after a given time of flight. By measuring the distribution of this time-of-flight, a mass spectrum of the secondary ions can be obtained. Based on the obtained mass spectrum, an image reflecting the in-plane distribution of any secondary ion peak can be formed. This process is achieved by detecting Si as a secondary ion. + Ions can be used to determine the in-plane distribution of polysiloxanes.

[0105] For example, Figure 1 The image shown is an image of the polysiloxane attachment on the fiber surface during TOF-SIMS imaging of the multifilament of Example 1. Based on the obtained image, the brightness values ​​were divided into 256 gray levels (0 gray level to 255 gray level) by grayscale conversion, and the number of pixels (pixel count) was numerically quantified. It should be noted that, as... Figure 1 As shown, in the case of multifilaments, the fibers (between the individual fibers that make up the multifilament) are excluded from the measurement by masking.

[0106] In image analysis, pixels with a brightness value of 0 (0 gray level) can be identified as non-attached parts, pixels with a brightness value of 255 (255 gray level) are excessively attached parts (parts where polysiloxane is locally attached (in the form of a block larger than 1 pixel in image analysis)) and pixels with brightness values ​​other than these (1~254 gray level) are appropriately attached parts (parts where polysiloxane is moderately attached (parts where polysiloxane is non-locally attached (in the form of small particles within 1 pixel))).

[0107] In other words, without any polysiloxane adhering (brightness value of 0), even with only wax adhering, improved wear resistance may be difficult to expect due to the wax migrating from that area with continued use. On the other hand, with excessive polysiloxane adhering (brightness value of 255), synergistic effects with the wax may be difficult to expect due to hindering wax adhesion. In contrast, for other brightness values, since moderately adhered polysiloxane adheres in a dotted manner, wax can penetrate between them, thus synergistic effects with the wax can be expected.

[0108] Furthermore, the appropriate proportion of the attached portion can be calculated using the following formula.

[0109] The percentage of appropriately attached pixels (%) = (Number of pixels in the appropriately attached portion / Total number of pixels) × 100

[0110] That is, when the above imaging is performed, for the measurement area obtained from a 256-grayscale monochrome image obtained by graying the ionic intensity derived from the above-mentioned polysiloxane, the proportion of the appropriately attached portion of polysiloxane to the fiber surface is 60% or more, preferably 65% ​​or more, and more preferably 70% or more, in terms of the number of pixels extracted as the ionic portion derived from the polysiloxane (excluding 0-grayscale and 255-grayscale) relative to the total number of pixels constituting the measurement area. There is no particular upper limit, and it can be 100% or less.

[0111] For example, when multiple locations (e.g., 10 locations) are designated as measurement areas, the proportion of appropriate attachment portions of polysiloxane in the high-strength fiber across all measurement areas can be calculated as the number of pixels (excluding 0 and 255 gray levels) extracted as ionic portions derived from polysiloxane relative to the total number of pixels. That is, the proportion of appropriate attachment portions in each measurement area can be averaged across all locations, and the average value satisfies the aforementioned range. For example, when multiple locations are designated as measurement areas, locations differing from each other by more than 1 m along the fiber axial direction can be selected. When the high-strength fiber has a cylindrical shape, such as being wound around a tube, from the viewpoint of excellent uniformity of wear resistance, 10 points (excluding the ends of the fiber) can be selected in each measurement area by dividing the entire fiber length into 11 equal parts along the fiber axial direction, and the average value of the proportion of appropriate attachment portions at these 10 points satisfies the aforementioned range.

[0112] The higher the proportion of appropriately attached polysiloxane, and the higher the proportion of polysiloxane adhering in a dotted pattern on the fiber surface, the more synergistic effect with wax can be expected. The presence of appropriately attached portions of high-viscosity polysiloxane on the fiber surface can maintain the abrasion resistance of high-strength fibers for a long time.

[0113] There are no particular limitations as long as the appropriate portion of the polysiloxane can adhere to the fiber surface within the aforementioned range. High-viscosity polysiloxanes are preferably applied to the fiber surface after emulsification with an emulsifier or the like. Specific application methods include impregnation, spraying, coating, and padding / plastering. Such treatment can be applied to various fiber structures (e.g., filaments, tows, yarns, cut fibers, wire bundles, ropes, fabrics, etc.) containing fibers (before the polysiloxane adheres). Various fiber structures can also be manufactured using the high-strength fibers treated as described above.

[0114] For example, based on the fiber weight of the high-strength fiber, the adhesion rate of the polysiloxane is 0.1% by weight or more, preferably 0.3% by weight or more, more preferably 0.5% by weight or more, even more preferably 1.0% by weight or more, even more preferably 1.5% by weight or more, 2.0% by weight or more, or 2.5% by weight or more. Furthermore, there is no particular upper limit; for example, it is 10% by weight or less, preferably 8% by weight or less, more preferably 7% by weight or less, and even more preferably 5% by weight or less. The adhesion rate is a value measured by the method described in the examples described later. Based on the fiber weight of the high-strength fiber, the adhesion rate of the polysiloxane can be, for example, 0.1 to 10% by weight, preferably 0.3 to 8.0% by weight, more preferably 0.5 to 7.0% by weight, even more preferably 1.0 to 5.0% by weight, even more preferably 1.5 to 5.0% by weight, particularly preferably 2.0 to 5.0% by weight, and especially preferably 2.5 to 5.0% by weight.

[0115] (Emulsifier)

[0116] Since the polysiloxane used in this invention has a high viscosity, it is preferable to disperse it when applying it to the fiber surface. As a dispersion treatment, there are no particular limitations as long as the appropriate amount of polysiloxane adhering to the fiber surface can be controlled; it can be carried out by high-speed stirring in a solvent, etc., but it is preferable to use an emulsifier to emulsify and adhere it to the fiber.

[0117] Emulsifiers can be nonionic, anionic, and cationic. Examples of nonionic emulsifiers include polyoxyethylene ethers (e.g., polyoxyethylene alkyl ethers, polyoxyethylene alkyl aryl ethers, polyoxyethylene aryl ethers, etc.) and polyethylene glycol esters. Examples of anionic emulsifiers include metal soaps, alkylbenzene sulfonates such as sodium alkylbenzene sulfonate, and alkylnaphthalene sulfonates such as sodium alkylnaphthalene sulfonate. Examples of cationic emulsifiers include quaternary ammonium salts such as monoalkylammonium chloride and dialkylammonium chloride. These emulsifiers can be used alone or in combination. Among these emulsifiers, the combination of anionic and nonionic emulsifiers is particularly preferred.

[0118] The amount of emulsifier used is about 1 to 80 parts by weight relative to 100 parts by weight of polysiloxane, preferably about 5 to 70 parts by weight, and even more preferably about 10 to 60 parts by weight.

[0119] (wax)

[0120] On the other hand, even when high-viscosity polysiloxanes are used alone, the abrasion resistance of high-strength fibers does not improve as expected. However, when wax is combined with such high-viscosity polysiloxanes and applied to the fiber surface, the abrasion resistance of the fibers is significantly improved, although the reason is not yet determined.

[0121] The improved wear resistance can be attributed to the following mechanism: wax and high-viscosity polysiloxane particles adhere to the fiber in a moderately coexisting state on at least a portion of the fiber surface, resulting in the high-viscosity polysiloxane remaining on the fiber surface. Furthermore, it can be considered that the wear resistance is significantly improved through the synergistic effect of both. For example, in the aforementioned fiber containing a high-strength resin, the molecules are highly oriented along the fiber axis, resulting in high strength, but the fiber surface is prone to wear. However, based on the mechanism brought about by the specific oiling components covering the fiber surface of the high-strength fiber, an effect that significantly improves wear resistance can be achieved regardless of the chemical structure of the fiber surface itself (i.e., the type of resin constituting the high-strength fiber).

[0122] Here, wax generally refers to an organic compound that is solid at room temperature and becomes liquid when heated. It can be derived from natural or synthetic sources. The melting point is not particularly limited; for example, it can be 50-100°C, preferably 55-100°C, and more preferably 60-90°C. When the melting point of the wax is within the above range, it is easy to produce a state where polysiloxane and wax coexist on the fiber surface.

[0123] The adhesion state of wax on the fiber surface can be determined in the same way as the adhesion state of polysiloxane on the fiber surface by time-of-flight secondary ion mass analysis (TOF-SIMS) imaging of the fiber surface. It should be noted that the secondary ions used in imaging the wax adhesion can be appropriately selected based on the chemical structure of the wax, a selection known to those skilled in the art. After the above imaging is performed, the appropriate proportion of wax adhesion can be 20% or more, preferably 30% or more, and more preferably 40% or more. There is no particular upper limit; it can be less than 100% or less, and less than 95%. It should be noted that the imaging and image analysis of the wax can be performed based on a method for calculating the appropriate proportion of polysiloxane adhesion on the fiber surface.

[0124] The higher the proportion of wax adhering appropriately, the higher the proportion of the portion adhering non-locally on the fiber surface (in the state of existing as tiny particles within 1 pixel), the more synergistic effect with polysiloxane can be expected.

[0125] The wax is preferably emulsified with an emulsifier, similar to the polysiloxane, and adheres to the fiber surface. Examples of emulsifiers mentioned above can be used. The wax can be applied by emulsifying it together with the polysiloxane, or by emulsifying the polysiloxane and wax separately. When applied separately, the polysiloxane can be applied first, or the wax can be applied first.

[0126] Preferred waxes include hydrocarbon waxes, ester waxes, and amide waxes. These waxes can be used alone or in combination of two or more.

[0127] Examples of hydrocarbon waxes include: paraffin wax, microcrystalline wax, polyethylene wax, Fischer-Tropsch wax, their oxidized waxes, hydrogenated waxes, etc.

[0128] Preferred examples include: paraffin wax, polyethylene wax, their oxidized wax, hydrogenated wax, etc.

[0129] Paraffin is a white wax that is solid at room temperature, with straight-chain hydrocarbons as its main component. These straight-chain hydrocarbons can have a carbon number distribution of approximately 20–40 and a molecular weight of approximately 300–550.

[0130] Polyethylene wax is a low molecular weight polyethylene wax produced by polymerizing ethylene in a linear fashion. The molecular weight can be, for example, 400 to 3000.

[0131] Ester waxes are compounds with long-chain molecular structures formed by ester bonds between straight-chain or branched long-chain fatty acids and straight-chain or branched long-chain aliphatic alcohols. The long-chain fatty acid has, for example, 10 or more carbon atoms, preferably 10 to 15, and more preferably 10 to 12. The long-chain aliphatic alcohol has, for example, 10 or more carbon atoms, preferably 10 to 15, and more preferably 10 to 12. The fatty acid and aliphatic alcohol can be saturated or unsaturated. The aliphatic alcohol can be a polyol, preferably a monohydric alcohol.

[0132] As an amide wax, it is a compound with a long chain molecular structure formed by amide bonding of a straight-chain or branched long-chain fatty acid and a straight-chain or branched long-chain aliphatic amine. The long-chain fatty acid has, for example, 10 or more carbon atoms, preferably 10 to 15, and more preferably 10 to 12. The long-chain aliphatic amine has, for example, 10 or more carbon atoms, preferably 10 to 15, and more preferably 10 to 12. The fatty acid and aliphatic amine can be saturated or unsaturated. The aliphatic amine can be a polyamine, preferably a monoamine.

[0133] Based on the weight of the high-strength fiber, the wax adhesion rate is, for example, 0.1% by weight or more, preferably 0.3% by weight or more. Furthermore, there is no particular upper limit, for example, 10% by weight or less, preferably 8% by weight or less, and more preferably 5% by weight or less. The adhesion rate is a value measured by the method described in the examples described later. Based on the weight of the high-strength fiber, the wax adhesion rate is, for example, 0.1 to 10% by weight, preferably 0.3 to 8.0% by weight, and more preferably 0.5 to 5.0% by weight.

[0134] Based on the weight of the high-strength fiber, the total amount of wax and polysiloxane can be, for example, 0.5% by weight or more, 1% by weight or more, and preferably 2% by weight or more. Furthermore, there is no particular upper limit; for example, it can be 20% by weight or less, 15% by weight or less, or 10% by weight or less. Based on the weight of the high-strength fiber, the total amount of wax and polysiloxane can be, for example, 0.5 to 20% by weight, preferably 1.0 to 15% by weight, and more preferably 2.0 to 10% by weight.

[0135] Furthermore, the adhesion ratio of the attached polysiloxane to the wax, expressed as polysiloxane / wax (Si / W), can be, for example, 20 / 80 to 90 / 10, preferably 30 / 70 to 85 / 15. In another preferred embodiment, it can be 50 / 50 to 80 / 20.

[0136] The high-strength fiber of the present invention exhibits excellent abrasion resistance. While the resistance varies depending on the type of high-strength resin contained in the fiber body—for example, in the case of liquid crystal polyester fiber—the number of reciprocating cycles until breakage, obtained through the twisting abrasion test described in the examples below, can be 120,000 cycles or more, preferably 140,000 cycles or more, more preferably 160,000 cycles or more, and even more preferably 200,000 cycles or more. There is no particular upper limit; for example, it can be around 2 million cycles or less.

[0137] For the high-strength fibers of the present invention, it is important that there is a high-viscosity polysiloxane, and that the high-viscosity polysiloxane and wax exist in a state that exhibits a synergistic effect on the fiber surface.

[0138] There are no particular limitations on the method of applying polysiloxane and wax to the fiber surface. Polysiloxane and wax can be applied separately or together. When applying polysiloxane and wax separately, for example, polysiloxane can be applied to the fiber surface using a coating roller, a guide nozzle, or an impregnation oiling method, and then wax can be applied using a coating roller, a guide nozzle, or an impregnation oiling method. The application order can be reversed. Preferably, the application of polysiloxane to the fiber surface and the application of wax to the fiber surface are performed continuously (e.g., before the first application is completely dry).

[0139] When polysiloxane and wax are applied together, as described above, a liquid formed by mixing polysiloxane and wax (preferably a liquid formed by emulsifying polysiloxane and wax) can be applied to the fiber surface. The application method is as described above, and can be carried out using known methods such as coating with a roller, coating with a guide nozzle, or impregnation oiling.

[0140] There are no particular restrictions on the temperature when applying polysiloxane and wax to the fiber surface, but 0~50°C is preferred.

[0141] The fibers to which polysiloxane and wax are applied can be dried through a heating process. The temperature of the heating process can be appropriately selected according to the type of fiber used, for example, it can be 30~200℃.

[0142] (Fiber structure)

[0143] This invention includes a fiber structure containing high-strength fibers. The fiber structure can be a one-dimensional structure such as continuous fibers (monofilaments, multifilaments), short fibers (cut fibers), filaments, ropes, tapes, soft threads, or cords; a two-dimensional structure such as fabrics, knitted fabrics, nonwoven fabrics, or nets containing the aforementioned high-strength fibers; or a three-dimensional structure. The fiber structure can be composed solely of high-strength fibers, or it can be composed of a combination of high-strength fibers and other fibers. For example, as a fiber structure, composite fibers using high-strength fibers and other fibers can be manufactured (e.g., blended filaments, blended yarns, etc., formed by mixing high-strength fibers and other fibers). Furthermore, composite fabrics using high-strength fibers and other fibers can also be manufactured (e.g., blended fabrics, laminates of fabrics made from high-strength fibers and other fibers, etc.).

[0144] In particular, the high-strength fibers of the present invention are useful as a constituent material of ropes. Ropes may contain the high-strength fibers of the present invention, or other fibers. The structure of the rope is not particularly limited and can be made into known structures, such as a single-layer twisted body or a braided body, depending on the application. In the case of a twisted body, it can be 3 or 4 strands; in the case of a braided body, it can be 8, 12, 16, or 32 strands, etc. Alternatively, it can be a double-structure rope consisting of an inner layer and an outer layer covering the inner layer. In the case of a double-structure rope, the inner and outer layers can be twisted bodies or braided bodies as described above, respectively. Furthermore, it is preferable that the inner layer of the double-structure rope contains high-strength fibers.

[0145] Ropes containing high-strength fibers can be used in the following fields depending on their structure: mooring of ships, lining for fishing nets, mooring of floating watercraft, ropes for mooring floating marine structures to the seabed for purposes such as marine resource exploration, towing ropes, cargo ropes, wind power generation equipment, power transmission equipment, and sports and leisure applications.

[0146] Additionally, as one aspect of the present invention, it may include a high-strength fiber having a wax coating and a polysiloxane with a viscosity of 5000 mPa·s or higher adhered to its surface, wherein the adhesion rate of the polysiloxane is 0.5% by weight or more, based on the fiber weight. It should be noted that the viscosity and adhesion rate can be within the numerical range specified in the polysiloxane section.

[0147] Example

[0148] The present invention will be further described in detail below through embodiments, but the present invention is not limited to the embodiments described below.

[0149] [Skin texture]

[0150] The total fineness of the multifilament samples was determined based on JIS L 1013:2010. Additionally, the fineness of a single fiber can be calculated by dividing the number of fibers constituting the multifilament by the total fineness.

[0151] [Polysiloxane viscosity]

[0152] The polysiloxane oil samples used in the examples and comparative examples were absolutely dried at 105°C for 2 hours, and the viscosity of the non-volatile components was measured using an E-type viscometer (measurement temperature: 25°C). The polysiloxane viscosity was taken as the minimum value of the measured range.

[0153] It should be noted that when determining the viscosity of polysiloxane adhering to a fiber sample, a solvent corresponding to the type of polysiloxane can be used to extract the polysiloxane from the fiber sample for measurement. For example, regarding the fiber samples obtained in the examples and comparative examples, a mixed solvent of hexane / ethanol (volume ratio 10 / 3) can be used to fractionate the polysiloxane from the extract obtained by Soxhlet extraction using preparative gel permeation chromatography, ensuring the amount required for viscosity measurement.

[0154] [TOF-SIMS Imaging: Determination of Appropriate Attachment]

[0155] The conditions used in TOF-SIMS imaging are as follows.

[0156] <Measurement Conditions>

[0157] Analysis device used: TOF-SIMS5 (ION-TOF GmbH)

[0158] Primary ion source: Bismuth cluster double-charged ions (Bi3) ++ )

[0159] Primary ion energy condition: 25keV

[0160] Primary ion target current: 0.2 pA (frequency 10 kHz)

[0161] Charge calibration: Charge calibration is performed using the electron gun attached to the device, and the charge is measured.

[0162] Detector: Measurement is performed via positive ion acquisition mode.

[0163] Measurement (secondary ion detection) range: 150 × 150 μm (random grating mode)

[0164] Pixel count: 128×128 pixels

[0165] Total number of scans: 64

[0166] <Analysis Methods for Image Distribution of Attachments>

[0167] Relative to the total secondary ion intensity X of the pixel with the highest intensity in the two-dimensional image, pixels with intensities less than 10% of X are considered "pixels without a sample" or "pixels whose distribution cannot be correctly evaluated" because the secondary ions cannot be sufficiently detected due to the unevenness of the fiber or the influence of its charge. These pixels will be excluded in the following analysis.

[0168] After the above processing, for pixels with a value of X greater than 10%, only the mass spectra of the ROIs were reconstructed. Then, using the mass spectra of the ROIs, Si was obtained as a secondary ion from polysiloxane. + Two-dimensional images of intensity.

[0169] The ion intensity of each pixel in the 2D image was extracted, and the maximum value Y, excluding outliers, was imported. It should be noted that outliers are values ​​greater than (3rd quartile) + (interquartile range) × 1.5 and less than (1st quartile) - (interquartile range) × 1.5.

[0170] Finally, the maximum value of the color bar in the two-dimensional image is set to Y, and the minimum value is set to 0, so that the two-dimensional image is represented in grayscale using a linear scale.

[0171] A series of operations were performed using the analysis software that came with the device.

[0172] <Calculation Method>

[0173] Use conversion software: Stirling )

[0174] It should be noted that the secondary ions measured are as follows.

[0175] Polysiloxane: Si +

[0176] ES (ester wax): C6H 11 +

[0177] PA (paraffin): C6H 11 +

[0178] PE (polyethylene wax): C6H 11 +

[0179] Based on the obtained image, the brightness values ​​are divided into 256 gray levels through binarization, and the number of pixels is numerically represented. Among the brightness values, pixels with a brightness value of 0 are considered non-attached parts, pixels with a brightness value of 255 are considered over-attached parts with excessive polysiloxane or wax, and pixels with other brightness values ​​are considered appropriately attached parts with moderate polysiloxane or wax.

[0180] Then, the proportion of the appropriate attachment portion is calculated using the following formula.

[0181] The percentage of appropriately attached pixels (%) = (Number of pixels in the appropriately attached portion / Total number of pixels) × 100

[0182] [Wax melting point]

[0183] Melting points of each wax oil sample were determined based on JIS K 0064:1992. The melting point of each wax oil was the minimum value of the measured range. The melting points of the waxes used in the examples and comparative examples are shown below.

[0184] ES (ester wax): 80℃

[0185] PA (paraffin): 55℃

[0186] PE (polyethylene wax): 100℃

[0187] It should be noted that when determining the melting point of wax adhering to a fiber sample, a solvent appropriate to the type of wax can be used to extract the wax from the fiber sample for determination. For example, with respect to the fiber samples obtained in the examples and comparative examples, a mixed solvent of hexane / ethanol (volume ratio 10 / 3) can be used to fractionate the wax from the extract obtained by Soxhlet extraction using preparative gel permeation chromatography to ensure the amount required for melting point determination and to perform the determination.

[0188] [Polysiloxane adhesion rate]

[0189] For the samples obtained in the examples and comparative examples, polysiloxanes were fractionated from the extract obtained by Soxhlet extraction using a mixed solvent of hexane / ethanol (volume ratio 10 / 3) by preparative gel permeation chromatography, and their weight was determined. The adhesion rate of the polysiloxane was calculated by dividing the obtained weight by the weight of the fiber sample used for extraction and expressing the result as a percentage.

[0190] [Wax adhesion rate]

[0191] For the samples obtained in the examples and comparative examples, waxes were fractionated from the extract obtained by Soxhlet extraction using a mixed solvent of hexane / ethanol (volume ratio 10 / 3) by preparative gel permeation chromatography, and their weights were determined. The wax adhesion rate was calculated as a percentage by dividing the obtained weight by the weight of the fiber sample used for extraction.

[0192] [Abrasion Resistance Test]

[0193] Yarn samples were prepared by twisting the fibers (multifilaments) obtained in the examples and comparative examples at 80 T / m. For example... Figure 2 As shown, a twisting abrasion test was conducted using the obtained yarn. The yarn was mounted on the upper and lower pulleys and fixed in a way that prevented slippage between the pulleys and the yarn. It should be noted that the inner diameter of both the upper and lower pulleys is 45mm, and the center-to-center distance between the upper and lower pulleys with the yarn fixed is adjusted to 500mm.

[0194] The yarn is first looped. Then, the looped yarn is twisted three times to form a twisted portion X of approximately 20mm, and fixed to the upper and lower pulleys. A 3kg load is applied to the lower pulley in the direction indicated by the lower arrow. The pulley is made to reciprocate at an angle of 180 degrees and a cycle of 60 times / minute (MV=34.2Hz), causing wear on the twisted portion of the yarn. The number of reciprocating motions until the yarn breaks is counted. It should be noted that the upper limit for the number of reciprocating motions is set to 1 million.

[0195] [Tensile Strength / Modulus of Elasticity]

[0196] Using the fibers obtained in the examples and comparative examples, the tensile strength was calculated according to JIS L1013:2010, and the value obtained by dividing it by the total fineness was taken as the tensile strength. In addition, the initial tensile resistance was calculated according to JIS L1013:2010, and was taken as the elastic modulus.

[0197] (Example 1)

[0198] For liquid crystal polyester fiber (manufactured by Kuraray Co., Ltd., Vectran (trademark), 1670 dtex / 300 filament, tensile strength 341 kg / mm²) 2 Elongation at break 4.0%, tensile modulus 6479 kg / mm² 2 The polysiloxane / wax mixture described in Table 5 is applied as an oil coating with an adhesion amount of 4.0% by weight based on the fiber weight, according to the weight ratio shown in Table 5. After drying, it is wound up.

[0199] (Examples 2-10)

[0200] Examples 2-4 and 6-9 are as described in Tables 5 and 6, with the viscosity of the polysiloxane, the type of wax, the weight ratio of polysiloxane to wax, and the amount of adhesion adjusted accordingly for each example. Otherwise, they are carried out in the same manner as in Example 1.

[0201] Examples 5 and 10 were prepared as described in Tables 5 and 6, with adjustments made to the viscosity of the polysiloxane, the type of wax, the weight ratio of the polysiloxane to the wax, and the amount of adhesion. The polysiloxane / wax mixture was also prepared by temperature adjustment and stirring to improve dispersibility. Otherwise, the process was the same as in Example 1.

[0202] (Compare Examples 1 and 2)

[0203] As described in Table 5, the viscosity of the polysiloxane, the type of wax, and the weight ratio of polysiloxane to wax were changed, but otherwise the process was the same as in Example 1.

[0204] (Compare Examples 3 and 4)

[0205] As described in Table 6, the viscosity and adhesion of the polysiloxane were changed, and no wax was used; otherwise, the procedure was the same as in Example 1.

[0206] The physical properties of the obtained high-strength fibers are shown in Tables 5 and 6.

[0207]

[0208]

[0209] As shown in Table 5, in Examples 1 to 6 where the viscosity of the polysiloxane is high, the proportion of the appropriate attached portion of the polysiloxane obtained by TOF-SIMS imaging is more than 60%, and the wear resistance is improved compared to Comparative Examples 1 and 2 by combining with wax.

[0210] In addition, as shown in Table 6, compared with Comparative Examples 3 and 4, which did not use wax, Examples 7 to 10 all showed improved wear resistance.

[0211] Industrial applicability

[0212] The high-strength fiber of this invention has significantly improved wear resistance, and is therefore useful as a clothing material, bedroom interior decoration material, sports material, industrial material, civil engineering material, transportation and handling material, etc.

[0213] The high-strength fibers of this invention are particularly useful as a material for ropes. Ropes containing high-strength fibers can be used in the following fields: mooring of ships, lining for fishing nets, mooring of floating watercraft, ropes for mooring floating marine structures used for marine resource exploration to the seabed, and other marine applications; towing ropes, cargo ropes, land applications such as wind power generation equipment and power transmission equipment; and sports and leisure applications.

[0214] As described above, preferred embodiments of the present invention have been explained, but various additions, modifications or deletions may be made without departing from the spirit of the present invention, and these modifications are also included within the scope of the present invention.

Claims

1. A high-strength fiber having wax and a polysiloxane with a viscosity of 5000 mPa·s or higher attached to its surface, wherein, when the surface is imaged using time-of-flight secondary ion mass analysis (TOF-SIMS), for a measurement area obtained from a 256-grayscale monochrome image derived from the ion intensity originating from the polysiloxane, the number of pixels extracted as ion-attached portions originating from the polysiloxane (excluding 0-grayscale and 255-grayscale pixels) relative to the total number of pixels constituting the measurement area is 60% or more.

2. The high-strength fiber according to claim 1, wherein, When performing TOF-SIMS imaging on the surface, for the measurement area obtained from a 256-grayscale monochrome image derived from the ion intensity of the wax, the number of pixels extracted as ion attachments from the wax (excluding 0-grayscale and 255-grayscale) relative to the total number of pixels constituting the measurement area is 40% or more.

3. The high-strength fiber according to claim 1 or 2, wherein, The fineness of a single fiber is 0.5~500 dtex.

4. The high-strength fiber according to any one of claims 1 to 3 is a multifilament.

5. The high-strength fiber according to any one of claims 1 to 4, wherein, The adhesion ratio of polysiloxane to wax is 20 / 80~90 / 10, calculated as polysiloxane / wax.

6. The high-strength fiber according to any one of claims 1 to 5, wherein, The wax is an ester wax.

7. The high-strength fiber according to any one of claims 1 to 6, wherein, The melting point of wax is 50~100℃.

8. The high-strength fiber according to any one of claims 1 to 7, wherein, Based on the fiber weight, the total amount of wax and polysiloxane is more than 1% by weight.

9. The high-strength fiber according to any one of claims 1 to 8, wherein, The high-strength fiber is selected from at least one of ultra-high molecular weight polyethylene fiber, aramid fiber, and liquid crystal polyester fiber.

10. A high-strength fiber, wherein wax and a polysiloxane with a viscosity of 5000 mPa·s or higher are attached to the fiber surface, and the adhesion rate of the polysiloxane is 0.5% by weight or more based on the fiber weight.

11. The high-strength fiber according to any one of claims 1 to 10, used in ropes.

12. A fiber structure comprising the high-strength fiber according to any one of claims 1 to 11.

13. A rope comprising the high-strength fiber according to any one of claims 1 to 11.

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