KR20210124026A - Cut-resistance complex fiber - Google Patents

Abstract

The present invention relates to a cut-resistance complex fiber and, more specifically, to a cut-resistance complex fiber capable of manufacturing a product providing a soft feel while having excellent cut resistance. According to the present invention, the cut-resistant complex fiber comprises a plurality of metal bodies containing a low-melting-point metal and a thermoplastic polymer. The melting point (T_1) of the low-melting metal and the melting point (T_2) of the thermoplastic polymer satisfy 1T_2 < T_1 < 3T_2 and the metal body is disposed in the central region of the fiber.

Description

Cut-resistance complex fiber

The present invention relates to a cut-resistant composite fiber, and more particularly, to a cut-resistant composite fiber capable of producing a product capable of providing a soft feel while having excellent cut resistance.

Workers in high-risk industries, such as metal and glass processing workshops, butcher shops, etc., or those working in security and disaster areas such as police, military or firefighters Wear cut-off gloves or clothing.

In general, as a means of imparting cut resistance, products made of high-strength spun yarn such as aramid fibers have been developed, but do not have sufficient cut resistance for use in the field of high-risk groups. On the other hand, various products using metal fibers have also been developed, but due to lack of flexibility, they cannot be practically applied to worksites where workers use a lot of hands.

Accordingly, development of polyethylene fibers containing metal components has been made, but the fibers are relatively rough and have a high probability of breakage, making it difficult to manufacture and process the fabric. In addition, as the metal is exposed to the surface, the manufactured product does not have a good tactile feel, thereby reducing the wearer's wearability, thereby hindering the movement of the wearer and reducing work efficiency. Such an uncomfortable fit has a big problem that can increase the risk of injury to the operator by causing avoidance of wearing.

(Patent Document 1): Republic of Korea Patent Publication No. 10-2020-0048122

It is an object of the present invention to provide a cut-resistant composite fiber capable of manufacturing a product capable of providing a soft feel while having excellent cut resistance.

The cut-resistant composite fiber of the present invention includes a plurality of metal bodies and a thermoplastic polymer including a low-melting-point metal, and the melting point (T ₁ ) of the low-melting-point metal and the melting point (T ₂ ) of the thermoplastic polymer satisfy the following relation , the metal body is located in the central region of the fiber.

[Relational Expression]

1T ₂ < T ₁ < 3T ₂

In the cut-resistant composite fiber according to an embodiment of the present invention, pores of the composite fiber may be less than 5% of a cross-sectional area in a radial cross-section.

In the cut-resistant composite fiber according to an embodiment of the present invention, 3 to 20% by weight of the metal body may be included based on the total weight of the composite fiber.

In the cut-resistant composite fiber according to an embodiment of the present invention, the area ratio of the metal body in the cross-sectional area in the radial direction of the composite fiber may be 0.1% to 45%.

In the cut-resistant composite fiber according to an embodiment of the present invention, the metal body is in the form of a metal yarn in which some or all of it extends in a direction parallel to the longitudinal direction of the composite fiber, and the aspect ratio of the metal yarn is 2 to 10 days. can

In the cut-resistant composite fiber according to an embodiment of the present invention, the composite fiber may include 5 to 50 pieces of the metal yarn per ^{100 μm 2 of the cross-sectional area.}

In the cut-resistant composite fiber according to an embodiment of the present invention, the diameter of the metal yarn may be 1 to 5㎛.

In the cut-resistant composite fiber according to an embodiment of the present invention, the low-melting metal may include any one or two or more elements selected from the group consisting of gallium, cesium, rubidium, indium, tin, bismuth, cadmium and lead. can

In the cut-resistant composite fiber according to an embodiment of the present invention, the thermoplastic polymer may be any one selected from the group consisting of polyethylene, polypropylene, polyamide, and polyester.

In the cut-resistant composite fiber according to an embodiment of the present invention, the composite fiber may have a tensile strength of 7 g/d to 16 g/d.

In the cut-resistant composite fiber according to an embodiment of the present invention, the composite fiber may have a core-sheath structure.

The present invention is a cut-resistant fabric comprising the above-described composite fiber.

The present invention is a protective product comprising the above fabric.

In the product for protection according to an embodiment of the present invention, the stiffness of the product may be 7 gf or less.

As the cut-resistant composite fiber according to the present invention has excellent cut resistance, it may be possible to manufacture textile products that are practically applicable to high-risk industries and disaster sites.

In addition, the cut-resistant composite fiber according to the present invention enables the manufacture of a product having a soft feel because the metal component is not exposed to the outside.

1 schematically shows an apparatus for manufacturing a composite fiber according to an embodiment of the present invention.

Unless otherwise defined in technical terms and scientific terms used in this specification, those of ordinary skill in the art to which this invention belongs have the meanings commonly understood, and in the following description and accompanying drawings, the subject matter of the present invention Descriptions of known functions and configurations that may unnecessarily obscure will be omitted.

Also, the singular form used herein may be intended to include the plural form as well, unless the context specifically dictates otherwise.

In addition, in the present specification, the unit used without special mention is based on the weight, for example, the unit of % or ratio means weight % or weight ratio, and unless otherwise defined, the weight % is any one component of the entire composition. It means % by weight in the composition.

In addition, the numerical range used herein includes the lower limit and upper limit and all values within the range, increments logically derived from the form and width of the defined range, all values defined therein, and the upper limit of the numerical range defined in different forms. and all possible combinations of lower limits. Unless otherwise defined in the specification of the present invention, values outside the numerical range that may occur due to experimental errors or rounding of values are also included in the defined numerical range.

As used herein, the term 'comprising' is an open-ended description having an equivalent meaning to expressions such as 'comprising', 'containing', 'having' or 'characterized', and elements not listed further; Materials or processes are not excluded.

In addition, as used herein, the term 'substantially' means that other elements, materials, or processes not listed together with the specified element, material or process are unacceptable for at least one basic and novel technical idea of the invention. It means that it can be present in an amount or degree that does not significantly affect it.

Cut resistance refers to the durability against being cut or punctured by sharp objects such as knives or blades. People who work in security and disaster fields, such as firefighters, wear cut-resistant gloves or clothing to protect the human body from weapons such as knives or sharp cutting tools.

Conventionally, cut-resistant products using polyethylene fibers containing metal components have been developed, but the fibers are relatively rough and have a high probability of breakage, making it difficult to manufacture and process the fabric. In addition, as the metal was exposed to the fiber surface, the manufactured product did not feel good to the touch, thereby reducing the wearer's wear and hindering the wearer's movement and lowering work efficiency. Such an uncomfortable fit has a big problem that can increase the risk of injury to the operator by causing avoidance of wearing.

Accordingly, the present applicant has conducted in-depth research for a long time to develop a composite fiber that has excellent cut resistance, including metal components, but is relatively soft and can reduce the possibility of breaking. Thus, it was found that the spun and drawn composite fibers have excellent cut resistance and at the same time it is possible to manufacture a product that can have a soft touch, and as a result of intensifying research on this, the present invention was completed.

In the present invention, the composite fiber refers to a yarn, and may be a monofilament yarn or a multifilament yarn. For example, when a multifilament yarn, the composite fiber may include 70 to 500 filaments each having a fineness of 1 to 50 denier, and may have a total fineness of 70 to 1,000 denier.

The cut-resistant composite fiber of the present invention includes a plurality of metal bodies and a thermoplastic polymer including a low-melting-point metal, and the melting point (T ₁ ) of the low-melting-point metal and the melting point (T ₂ ) of the thermoplastic polymer satisfy the following relation , the metal body is located in the central region of the composite fiber.

[Relational Expression]

1T ₂ < T ₁ < 3T ₂

As such a composite fiber includes a metal body including a low-melting-point metal, it is possible to produce a relatively soft product while having excellent cut resistance. Accordingly, the manufacturing and processing of the fabric is easy, and as it can be manufactured into various products, the industrial applicability is very high.

Specifically, the melting point of the low-melting metal the melting point of (T ₁₎ and the thermoplastic polymer (T ₂₎ may be _{1.5T 2 <T 1 <2T 2} . As such, the composite fiber of the present invention does not have a large difference in the melting points of the thermoplastic polymer and the low-melting-point metal, so it is easy to spin and stretch, and a metal body having a relatively large aspect ratio can be formed.

As described above, the composite fiber contains a low-melting-point metal and a thermoplastic polymer, and thus may have fewer pores. Specifically, the composite fiber may have pores of 10%, preferably 5%, and more preferably less than 3% of the cross-sectional area on a radial cross-section. That is, the composite fiber may have excellent tensile strength and elongation and maintain a certain strength as substantially no pores are included. Accordingly, it can be advantageously applied during fabric manufacturing processes such as braiding and weaving, and can have excellent cut resistance. Specifically, the composite fiber may have a tensile strength of 7 to 16 g/d, specifically, 8 to 13 g/d, and an elongation of 3 to 10%.

In addition, the composite fiber may be manufactured into a product capable of providing excellent tactile feel as the metal body is positioned in the central region of the composite fiber. Specifically, as the metal body is located in the central region of the composite fiber, when an external force is generated, the metal component can be prevented from protruding to the outside. Accordingly, since the product manufactured from the composite fiber may have peeling resistance according to excellent abrasion resistance, the tensile strength of the composite fiber may be maintained and the durability of the manufactured fabric may be maintained.

On the other hand, a product made of a composite fiber in which the metal body is positioned on the surface of the fiber as well as the central region of the fiber exhibits relatively low abrasion resistance. Due to this, a lot of lint (peeling) is generated when used for a long time, the tensile strength of the composite fiber is gradually reduced, and the durability of the manufactured fabric may be deteriorated.

In the present invention, the central region may mean an area within 80% of the radius of the cross-section based on the center of the radial cross-section of the composite fiber.

Based on the total weight of the composite fiber, the metal body may include 1 to 50% by weight, specifically 3 to 20% by weight, and more specifically 5 to 17% by weight. As the metal body is included in the composite fiber in the above content range, the specific gravity of the composite fiber increases, so it can have flexibility while having an appropriate weight, and it is preferable because it can have excellent cut resistance.

The metal body is located in the central region of the composite fiber, but the ratio of the area occupied by the metal body to the cross-sectional area in the radial direction of the composite fiber may be 0.1 to 45%, specifically 0.2 to 30%, more specifically 0.25 to 10%. not limited However, in the above range, the metal body is uniformly dispersed in the central region, so that it is possible to further prevent the metal body from protruding to the outside.

In the present invention, the thermoplastic polymer may have a melting point of 90 to 450 °C, preferably 100 to 290 °C. Specifically, it may be any one selected from the group consisting of polyethylene, polypropylene, polyamide and polyester. Preferred thermoplastic polymers may be polyethylene (PE) or polyethylene terephthalate (PET), and the polyethylene (PE) may be high-density polyethylene (HDPE). Polyethylene fibers or polyethylene terephthalate fibers may be prepared by known spinning methods such as wet spinning, dry spinning or melt spinning, but is preferably spun together with a metal body through melt spinning to produce a high-density composite fiber, Remarkable cutting resistance can be realized.

In one embodiment, the thermoplastic polymer may be polyethylene, and the polyethylene is 80,000 g/mol to 180,000 g/mol, specifically, 100,000 g/mol to 170,000 g/mol, more specifically 120,000 g/mol to 160,000 g/mol It may have a weight average molecular weight (Mw) of, but is not limited thereto. The polyethylene may be high-density polyethylene (HDPE) having a density of 0.941 to 0.965 g/cm ³ , and may have a crystallinity of 55 to 85%, preferably 60 to 85%.

In addition, the polyethylene may have a Polydispersity Index (PDI) of greater than 5 and less than or equal to 9. The polydispersity index (PDI) is the ratio of the weight average molecular weight (Mw) to the number average molecular weight (Mn) (Mw/Mn), and is also referred to as the molecular weight distribution index (MWD). If the PDI of polyethylene is less than 5, the flowability is not good due to a relatively narrow molecular weight distribution, and the processability during melt extrusion is poor, resulting in trimming due to non-uniform discharge during the spinning process. Conversely, when the PDI of the polyethylene exceeds 9, melt flowability and processability during melt extrusion are improved due to a wide molecular weight distribution, but the tensile strength of the finally obtained fiber may be reduced because it contains too much low molecular weight polyethylene.

On the other hand, the thermoplastic polymer may be polyethylene terephthalate, and specifically, a resin prepared by polycondensation through direct esterification or transesterification using ethylene glycol and terephthalic acid or dimethyl terephthalate as monomers is used. The intrinsic viscosity of the prepared resin may be 0.5 to 1.2 dl/g. When the intrinsic viscosity of the PET resin is less than 0.5, the overall mechanical properties of the resin composition may deteriorate, and if the intrinsic viscosity is more than 1.2, processing may be difficult due to reduced flowability during injection molding due to high viscosity.

In the present invention, the low melting point metal may have a melting point of 70 to 500° C., preferably 100 to 300° C., more preferably 150 to 270° C., and it is preferable that the melting point is lower than the spinning and stretching temperature of the polymer. Such a low-melting-point metal is melted together with a thermoplastic polymer as a raw material and, when spun and stretched, is stretched in the longitudinal direction of the fiber to be provided as a metal yarn having an aspect ratio. Accordingly, the composite fiber including the same may be capable of manufacturing a product having better cut resistance.

As described above, some or all of the metal body may be in the form of a metal yarn extending in a direction parallel to the longitudinal direction of the composite fiber. At this time, on the cross-section in the diametric direction of the composite fiber, two or more metal threads may be dispersedly included. That is, the diametrical cross section of the composite fiber may have a sea-island-type structure, a polymer in the sea portion and a metal yarn in the island portion, and the metal yarns are located in the central region of the composite fiber in the longitudinal direction of the fiber and They may be dispersed and included in parallel to each other. The composite fiber of the island-in-the-sea yarn structure means that the metal yarns are arranged so that a certain section overlaps each other along the longitudinal direction, but are arranged to be spaced apart from each other.

The composite fiber according to the present invention may have excellent strength that can be manufactured into a cut-resistant fabric due to the metal yarn. Specifically, the composite fiber including the metal yarn may have a strength of 13 g/d, specifically 15 g/d or more. In addition, the composite fiber including the metal yarn has an initial modulus of 350 g/d or less, and has a relatively low stiffness when manufactured as a cut-resistant fabric to have an improved fit.

In the present invention, "parallel" means that the metal yarn is oriented in a direction parallel to the axial direction of the composite fiber, but as the drawing direction of the metal yarn is determined by the spinning and drawing process of the composite fiber, the metal yarn is oriented at a specific angle may also be included. Specifically, it may mean that the composite fiber is oriented at an angle of 0 to 60°, preferably within 45°, and more preferably within 20° from the axial direction of the composite fiber.

In the radial cross section of the composite fiber according to the present invention, the number of metal threads per unit area of the monofilament may be 1 to 100, specifically 5 to 50, and more specifically 10 to 30, but is not limited thereto. . However, in the above range, the metal yarn can maintain uniform dispersibility in the composite fiber. In this case, the unit area means an area ^{of 100 μm 2} of the diametrical cross section of the monofilament.

The aspect ratio of the metal yarn extending in the axial direction of the composite fiber may be 1.1 to 50, specifically 2 to 10, and more specifically 3 to 8, but is not limited thereto. In this case, the diameter of the metal thread may be 0.5 to 10 μm, specifically 1 to 5. The composite fiber including such a metal yarn may have relatively soft fiber properties while maintaining excellent cutting resistance.

The low-melting-point metal may be used without limitation as long as it satisfies the above relational expression, and may refer to a single component metal or metal alloy. Specifically, the single metal may be any one selected from the group consisting of indium, tin, bismuth, cadmium, and lead. In addition, specifically, the metal alloy may be a metal alloy including two or more selected from the group consisting of gallium, cesium, rubidium, indium, tin, bismuth, cadmium, and lead. In one embodiment, it may be a tin-bismuth alloy.

According to one aspect of the present invention, the composite fiber may have a core-sheath structure. In one embodiment, the composite fiber may have a core-sheath structure. For example, the metal body of the present invention may be located in the core, and the thermoplastic polymer may be located in the core and the sheath. As described above, the composite fiber of such a structure is easy to control that the metal body is dispersed in the central region, and the physical properties of the fiber can be easily controlled by adjusting the formation area of the core and the sheath on the diametrical cross section of the fiber. have. That is, by controlling the cross-sectional area of the composite fiber, the area ratio between the core and the sheath, and the distribution position of the metal body, it is easy to manufacture products having various physical properties. Specifically, fabrics made of composite fibers with a sheath formation area larger than the core formation area have lower stiffness than fabrics made of composite fibers with a sheath formation area smaller than the core formation area, making it possible to manufacture fabrics with high drape properties. . Accordingly, it is possible to individually adjust the wearing comfort, so that it is possible to manufacture a protective product that does not avoid wearing more.

Hereinafter, referring to FIG. 1, a method for manufacturing a composite fiber using a polyethylene polymer will be described as a specific example, but the present invention is not limited thereto.

First, a mixed chip (chip) in which a low-melting-point metal and polyethylene are mixed and a polyethylene chip are put into a first extruder 100 and a second extruder 700, respectively, and melted to obtain a melt.

The melt is transported through the nozzle 100 by a screw (not shown) in the first extruder 100 and the second extruder 700, and through a nozzle for compound spinning formed in the nozzle 200. extruded The number of nozzles of the nozzle 200 may be determined according to the Denier Per Filament (DPF) and fineness of the yarn to be manufactured. For example, when manufacturing a yarn having a total fineness of 75 denier, the spinner 200 may have 20 to 75 holes, and when manufacturing a yarn having a total fineness of 450 denier, the spinner 200 is It may have 90 to 450 holes, preferably 100 to 400 holes.

The melting process in the first extruder 100 and the second extruder 700 and the extrusion process through the nozzle 200 can be changed and applied depending on the melt index of the used chip, but specifically, for example, 150 to 315 °C, preferably 250 to 315 °C, more preferably 265 to 310 °C. That is, the first extruder 100, the second extruder 700 and the detention 200 may be maintained at 150 to 315 °C, preferably 250 to 315 °C, more preferably 265 to 310 °C. have.

When the spinning temperature is less than 150° C., the spinning may be difficult because the polyethylene and the metal are not uniformly melted due to the low spinning temperature. On the other hand, when the radiation temperature exceeds 315°C, thermal decomposition of polyethylene may be caused and thus desired strength may not be expressed.

L/D, which is the ratio of the hole length (L) to the hole diameter (D) of the nozzle 200, may be 3 to 40. If L/D is less than 3, a die swell phenomenon occurs during melt extrusion and it becomes difficult to control the elastic behavior of polyethylene and metal, resulting in poor spinnability, and if L/D exceeds 40, detention (200) In addition to trimming due to the necking phenomenon of the molten polyethylene passing through the molten polyethylene, a discharge non-uniformity phenomenon due to pressure drop may occur.

As the molten polyethylene is discharged from the holes of the nozzle 200, the solidification of the polyethylene starts due to the difference between the spinning temperature and the room temperature to form the filaments 11 in a semi-solidified state. In the present specification, both the filaments in the semi-solidified state as well as the fully solidified filaments are collectively referred to as “filaments”.

A plurality of the filaments 11 are completely solidified by cooling in a cooling section (or “quenching zone”) 300 . Cooling of the filaments 11 may be performed by an air cooling method.

The cooling of the filaments 11 in the cooling unit 300 is preferably performed to be cooled to 15 to 40 ℃ using a cooling wind of 0.2 to 1 m/sec wind speed. If the cooling temperature is less than 15 ℃, the elongation may be insufficient due to overcooling, so that yarn breakage may occur during the stretching process. Disruption may occur.

In addition, it is possible to make crystallization more uniformly by performing multi-stage cooling during cooling in the cooling unit, and thus it is possible to manufacture a composite fiber having superior strength. More specifically, the cooling unit may be divided into three or more sections. For example, when it consists of three cooling sections, it is preferable to design so that the temperature gradually decreases from the first cooling unit to the third cooling unit. Specifically, for example, the first cooling unit may be set to 40 to 80 °C, the second cooling unit may be set to 30 to 50 °C, and the third cooling unit may be set to 15 to 30 °C.

In addition, by setting the highest wind speed in the first cooling unit, it is possible to produce a fiber with a smoother surface. Specifically, the first cooling unit is cooled to 40 to 80 °C using a cooling wind having a wind speed of 0.8 to 1 m/sec, and the second cooling unit is cooled to 30 to 50 °C using a cooling wind having a wind speed of 0.4 to 0.6 m/sec. to be cooled, and the third cooling unit may be cooled to 15 to 30 ° C using a cooling wind with a wind speed of 0.2 to 0.5 m/sec, and by adjusting these conditions, the yarn has a higher crystallinity and a smoother surface. can be manufactured.

Then, the multifilaments 10 are formed by focusing the cooled and completely solidified filaments 11 with a collector 400 .

As illustrated in FIG. 1 , the composite fiber of the present invention may be manufactured through a melt spinning process. That is, the multi-filament 10 is directly transferred to the multi-stage stretching unit 500 including a plurality of godet roller units GR1 ... GRn, and multi-stage stretching is performed at a total draw ratio of 2 to 20, preferably 3 to 15 times. After being made, it may be wound on the winder 600 . In addition, in the final stretching section during multi-stage stretching, it is possible to provide a composite fiber with more excellent durability by giving a contraction stretching (relaxation) of 1 to 5%.

Alternatively, the composite fiber of the present invention may be manufactured by winding the multifilament 10 as an undrawn yarn and then drawing the undrawn yarn. That is, the composite fiber of the present invention may be manufactured through a two-step process in which the undrawn yarn is once prepared and then the undrawn yarn is drawn.

If the total draw ratio applied in the drawing process is less than 2, the polyethylene of the composite fiber finally obtained cannot have a crystallinity of 60% or more, and there is a risk of inducing lint (peeling) on the fabric made of the composite fiber.

On the other hand, if the total draw ratio exceeds 15 times, there is a possibility that yarn breakage occurs. Users may feel uncomfortable.

When the linear speed of the first godet roller part GR1 that determines the spinning speed of melt spinning of the present invention is determined, the total draw ratio of 2 to 20, preferably 3 to 15, in the multi-stage stretching part 500 is the multi In order to be applied to the filament 10, the linear velocity of the remaining godet roller parts is appropriately determined.

According to an embodiment of the present invention, the multi-stage stretching unit 500 is formed by appropriately setting the temperature of the godet roller units GR1 ... GRn of the multi-stage stretching unit 500 in the above-described melting point range of the polymer and the metal. Through this, heat-setting of the polyethylene yarn can be performed. Specifically, for example, the multi-stage stretching unit may be composed of 3 or more, specifically 3 to 5 stretching sections. In addition, each stretching section may be composed of a plurality of godet roller parts.

Specifically, for example, the multi-stage stretching section may be composed of four stretching sections, and after stretching at a total draw ratio of 7 to 15 times in the first stretching section to the third stretching section, 1-3% shrinkage stretching in the fourth stretching section (relaxation) may be performed. The total draw ratio refers to a final draw ratio of the fiber that has passed through the first drawing section to the third drawing section compared to the fiber before drawing.

More specifically, the first stretching section may be performed at 100 to 300 °C, and the total stretching ratio may be 2 to 5 times. The second stretching section may be performed at a higher temperature than that of the first stretching section, and specifically may be performed at 100 to 350 °C, and stretching so that the total draw ratio is 5 to 8 times. The third stretching section may be performed at 150 to 250 °C, and stretching may be performed so that the total stretching ratio is 7 to 15 times. The fourth stretching section may be performed at the same or lower temperature as the second stretching section, and specifically, may be performed at 100 to 350 ° C., and may be to perform 1 to 3% shrinkage stretching (relaxation).

Multi-stage stretching and heat setting of the multi-filament 10 are simultaneously performed by the multi-stage stretching unit 500 , and the multi-stage stretched multi filament 10 is wound around the winder 600 to complete the polyethylene yarn of the present invention. Polyethylene fibers prepared in this way may be braided or woven to make a fabric having cut resistance.

Meanwhile, the fabric may be a woven or knitted fabric having a weight per unit area (ie, areal density) of 150 to 800 g/m2. If the areal density of the fabric is less than 150 g/m2, the density of the fabric is insufficient and many voids exist in the fabric, and these voids reduce the cut resistance of the fabric. On the other hand, if the areal density of the fabric exceeds 800 g/m2, the fabric becomes very stiff due to an excessively dense fabric structure, a problem occurs in the user's tactile sense, and problems in use due to the high weight are induced.

Such a fabric may be processed into a product requiring excellent cut resistance. The product may be any conventional textile product, but preferably may be protective gloves or clothing for protecting the human body.

The product can exhibit excellent wearability by having an excellent cut resistance of 4N or more, more preferably 5N to 10N, and at the same time, a low stiffness of 7 gf or less, more preferably 3 to 6 gf.

Hereinafter, the present invention will be described in more detail through examples. However, the following examples are only a reference for describing the present invention in detail, and the present invention is not limited thereto, and may be implemented in various forms.

Also, unless otherwise defined, all technical and scientific terms have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. The terminology used herein is for the purpose of effectively describing particular embodiments only and is not intended to limit the invention. In addition, the unit of additives not specifically described in the specification may be weight %.

<Example 1>

Using the apparatus illustrated in FIG. 1, under the conditions described in Table 1 below, a composite fiber was prepared.

Specifically, a chip in which polyethylene having a weight average molecular weight (Mw) of 200,000 g / mol, and a melt index (MI at 190 ° C) of 1.5 g / 10 min and the metal described in Table 1 are mixed was mixed with the first extruder ( 100), and the polyethylene chips not mixed with metal were put into the second extruder 700 and melted, respectively. The melt was extruded through a nozzle 200 . The temperature of the nozzle 200 is the processing temperature of Table 1 below.

The filaments 11 formed while being discharged from the nozzle holes for spinning the composite fiber of the nozzle 200 were sequentially cooled in the cooling unit 300 consisting of three sections. In the first cooling unit, it was cooled to 50°C by the cooling wind at a wind speed of 0.9 m/sec, and in the second cooling unit, it was cooled to 35°C by the cooling wind at a wind speed of 0.5 m/sec, and in the third cooling unit, it was cooled to 0.4 It was finally cooled to 25°C by a cooling wind at a wind speed of m/sec. After cooling, the multifilament yarn 10 was focused by the collector 400 .

Then, the multifilament yarn moved to the stretching unit 500 . The stretching section consists of a multi-stage stretching section consisting of four sections, specifically, the first stretching section is drawn at a maximum drawing temperature of 100 ° C. at a total draw ratio of 3 times, and the second drawing section is a maximum drawing temperature of 150 ° C. at a total draw ratio of 8 times. Stretched, the third stretching section is stretched by 10 times the total draw ratio at the maximum stretching temperature of 150 °C, and the fourth stretching section is stretched by 2% shrinkage and stretching (relaxation) at the maximum stretching temperature of 150 °C compared to the third stretching section. fixed

Then, the stretched multifilament yarn was wound around the winder (600). The winding tension was 0.8 g/d.

A protective glove was prepared by knitting the prepared multifilament yarn.

division Example 1 Example 2 Example 3 Example 4 Example 5 Example 6 process
condition Raw material PE PET PE PE PE PE Processing temperature (℃) 270 300 270 270 270 270 Metal type (melting point) Sn
(230℃) Sn
(230℃) Sn+Bi
(140℃) Sn
(230℃) Sn
(230℃) Sn
(230℃) Metal content ratio (wt%) 12 12 12 4 12 17 location of metals core core core core core core draw ratio 7 5 7 7 12 7

<Example 2>

In Example 1, a protective glove was prepared in the same manner as in Example 1, except that a polyethylene terephthalate resin having a weight average molecular weight (Mw) of 100,000 g/mol and a viscosity of 1 dl/g was used instead of a polyethylene chip. and proceeded under the conditions described in Table 1.

<Examples 3 to 6>

Hereinafter, Examples 3 to 6 were prepared with reference to Table 1. Examples 3 to 6 were carried out in the same manner as in Example 1, but each was carried out under the conditions described in Table 1.

<Comparative Example 1>

In Example 1, a protective glove was manufactured in the same manner as in Example 1, except that copper (Cu, Tm: 1,085° C.) powder having an average particle diameter of 1.2 μm was used instead of the metal.

<Comparative Examples 2 to 3>

In Example 1, a protective glove was manufactured in the same manner as in Example 1, except that the metal content was added to satisfy Table 2 below.

division Comparative Example 1 Comparative Example 2 Comparative Example 3 Comparative Example 4 Comparative Example 5 process Raw material PE PE PE PE PE processing temperature 270 270 270 270 270 metal type Cu Sn Sn Sn Sn Metal content ratio (wt%) 12 50 One 12 12 location of metals core core core sheath core/sheath draw ratio 7 7 7 7 7

<Comparative Example 4>

In Example 1, the raw material input to the first extruder 100 is input to the second extruder 700, and the raw material input to the first extruder 100 is added to the second extruder ( 700), a protective glove was prepared in the same manner as in Example 1.

<Comparative Example 5>

In Example 1, the raw material put into the first extruder 100 and the raw material put into the second extruder 700 were put into the first extruder 100, and the first extruder 100 ), except that it was spun using only a protective glove was prepared in the same manner as in Example 1.

* Measurement of strength (g/d)

According to the ASTM D885 method, the strength of the multifilament yarn was obtained by obtaining a strain-stress curve of the multifilament yarn using a universal tester of Instron Engineering Corp, Canton, Mass. Specifically, the sample length was 250 mm, the tensile speed was 300 mm/min, and the initial load was set to 0.05 g/d.

* Cut Resistance

The cut resistance of protective gloves was measured according to the ISO13997:1999 standard.

* Stiffness (gf)

After taking a specimen (width: 60 mm, length: 60 mm) from the palm of the protective glove, the stiffness of the specimen was measured according to section 38 of ASTM D885/D885M-10a (2014). The measuring device was as follows.

(i) CRE-type Tensile Testing Machine (model: INSTRON 3343)

(ii) Loading Cell, 2 KN [200 kgf]

(iii) Specimen Holder: The specimen holder as defined in section 38.4.3.

(iv) Specimen Depressor: The specimen depressor as specified in section 38.4.4.

Specifically, the specimen is held so that the outer side of the glove is facing up, the inner side of the glove is facing down, and the side adjacent to the glove finger and the opposite side (ie, the side adjacent to the glove wrist) are directly supported by the specimen holder. placed in the center of the holder. The specimen was not bent and maintained in a flat state. At this time, the distance between the specimen supporting part of the specimen holder and the depressing part of the specimen depressor was 5 mm. Then, the maximum force was measured while the specimen holder was raised by 15 mm while the specimen depressor was left still.

Table 3 below describes the measurement results of the physical properties of the composite fibers and gloves prepared in Examples, and Table 4 describes the measurement results of the physical properties of the composite fibers and gloves prepared in Comparative Examples.

division Example 1 Example 2 Example 3 Example 4 Example 5 Example 6 Properties Total fineness (De) 404 402 405 404 401 402 DPF 4 4 4 4 4 4 Pillar diameter (㎛) 24.2 24.3 24.5 23.7 23.8 23.9 Metal Yarn Aspect Ratio 4.7 3.1 7.8 3.8 5.4 5.1 Strength (g/d) 8.7 7.5 8.5 11.8 10.9 7.6 Lecture degree (gf) 3.8 3.2 3.3 3.1 4.4 5.1 Cut resistance (N) 6.3 5.2 6.1 4.7 6.5 6.9

division Comparative Example 1 Comparative Example 2 Comparative Example 3 Comparative Example 4 Comparative Example 5 Properties Total fineness (De) 404 thread formation
impossible 403 thread formation
impossible thread formation
impossible DPF 4 4 Pillar diameter (㎛) 24 23.8 Metal Yarn Aspect Ratio - 4.1 Strength (g/d) 5.7 12.4 Lecture degree (gf) 6.2 2.9 Cut resistance (N) 2.5 3.9

Referring to Tables 3 to 4, the gloves of the present invention may have a lower stiffness while having an excellent cut resistance compared to Comparative Examples.

Specifically, when comparing Example 1 and Comparative Example 1 using a different metal, in Example, although the polymer and the metal, which are different materials, are melt-spun, almost no pores are formed in the areas in contact with each other. More specifically, based on the radial cross-section of the composite fiber prepared in Example 1, the ratio of the formation area of the pores to the total cross-sectional area was less than 5%.

On the other hand, as in Comparative Example 1, the composite fiber containing a metal having a large melting point difference had very different melting points when manufactured, so it was difficult to melt spinning itself, making it difficult to form the yarn itself. Even when the yarn was manufactured, the shape change of the polymer and the shape change between the metals did not occur together during melt spinning and stretching, so that it was possible to obtain a fiber containing a particulate metal body rather than a metal yarn type metal body. Such fibers may form pores between the polymer and the metal, so that when manufactured as a fabric for cut resistance, the fiber may not only have high breakability, but also may not have cut resistance due to low strength.

When Comparative Examples 2 to 3 and Examples having different metal contents were compared, it was found that the composite fiber of the present invention could be easily spun and had excellent cut resistance.

In addition, when compared with Comparative Examples 4 to 5, which have different metal positions on the fiber cross-section, the composite fiber of the present invention exhibited all of excellent strength, stiffness and cut resistance, so it was confirmed that it was easy to manufacture as a textile product, It was confirmed that the texture of the manufactured product was very soft.

As described above, the present invention has been described with specific details and limited examples and drawings, but these are only provided to help a more general understanding of the present invention, and the present invention is not limited to the above embodiments, and the present invention is not limited to the above embodiments. Various modifications and variations are possible from these descriptions by those of ordinary skill in the art.

Therefore, the spirit of the present invention should not be limited to the described embodiments, and not only the claims to be described later, but also all those with equivalent or equivalent modifications to the claims will be said to belong to the scope of the spirit of the present invention. .

Claims (14)

It contains a plurality of metal bodies and thermoplastic polymers containing low-melting metals,
The melting point of the low melting point metal melting point (T ₂₎ of the (T ₁₎ and the thermoplastic polymer is to satisfy the following relation,
The metal body is a cut-resistant composite fiber located in the central region of the fiber.
[Relational Expression]
1T ₂ < T ₁ < 3T ₂ According to claim 1,
The composite fiber has a cross-section in the radial direction, wherein the pores are less than 5% of the cross-sectional area ratio, cut-resistant composite fiber.
According to claim 1,
A cut-resistant composite fiber comprising 3 to 20% by weight of the metal body based on the total weight of the composite fiber.
According to claim 1,
The cut-resistant composite fiber wherein the ratio of the area occupied by the metal body in the cross-sectional area in the radial direction of the composite fiber is 0.1% to 45%.
According to claim 1,
The metal body is in the form of a metal yarn in which some or all of it extends in a direction parallel to the longitudinal direction of the composite fiber, and the aspect ratio of the metal yarn is 2 to 10.
6. The method of claim 5,
The composite fiber is a cut-resistant composite fiber comprising 5 to 50 of the metal yarn per ^{100 μm 2} of the cross-sectional area.
6. The method of claim 5,
The metal yarn diameter is 1 to 5㎛ cut-resistant composite fiber.
According to claim 1,
The low-melting metal is a cut-resistant composite fiber comprising any one or two or more elements selected from the group consisting of gallium, cesium, rubidium, indium, tin, bismuth, cadmium and lead.
According to claim 1,
The thermoplastic polymer is any one selected from the group consisting of polyethylene, polypropylene, polyamide and polyester.
According to claim 1,
The composite fiber is a cut-resistant composite fiber having a tensile strength of 7 g/d to 16 g/d.
According to claim 1,
The composite fiber is a core-sheath (core sheath) structure of a cut-resistant composite fiber.
A cut-resistant fabric comprising the composite fiber of any one of claims 1 to 11
A protective product comprising the fabric of claim 12 .
14. The method of claim 13,
The strength of the above product is 7gf or less for protection.

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