KR102292281B1 - Aramid polyethylene terephthalate hybrid twisted yarn its manufacturing method applying Air Textred Yarn(ATY) method - Google Patents

Abstract

The present invention relates to an aramid polyethylene terephthalate hybrid twisted yarn and a method of producing the same by applying an air entangled yarn (ATY) technique. Specifically, the hybrid twisted yarn comprises: an aromatic polyamide filament yarn as a first raw material; and polyethylene terephthalate (PET) filament yarn as a second raw material, wherein the first raw material includes a para-polyamide filament yarn and a meta-polyamide filament yarn contained in a weight ratio of 7-3:3-7. Accordingly, the hybrid twisted yarn having excellent workability, strength, heat resistance, durability, pressure resistance, and fatigue resistance can be produced. In addition, the present invention is produced by mixing the aromatic polyamide filament yarn with the polyethylene terephthalate filament yarn so as to apply a touch like cotton yarn, and is prevented from being tangled or cut. Accordingly, during a hybrid twisted yarn process, bulkiness and workability can be improved.

Description

Aramid polyethylene terephthalate hybrid twisted yarn its manufacturing method applying Air Textred Yarn (ATY) method

The present invention relates to an aramid polyethylene terephthalate hybrid twisted yarn and a method for producing the same by applying an air-entangled yarn (ATY) method, in detail, an aromatic polyamide filament yarn as a first raw material; Polyethylene terephthalate (PET) filament yarn as a second raw material; the first raw material includes a para-polyamide filament yarn 7 to 3 weight ratio: meta-polyamide filament yarn 3 to 7 weight ratio, including workability, strength , It relates to an aramid polyethylene terephthalate hybrid yarn having excellent heat resistance, durability, pressure resistance, and fatigue resistance, and a method for manufacturing the same by applying the air-entangled yarn (ATY) method.

Aramid is a fiber that is largely distinguished from Nylon, which is a representative of aliphatic polyamide. It was proposed by Dupont, the U.S. company that first developed aromatic polyamide fiber in 1971, and then accepted by the U.S. Federal Trade Commission in 1974. Aromatic Polyamide) is a general term.

The precise meaning of the term is a fiber made from synthetic polyamide in which 85% or more of the amide group (CO-NH) is directly connected to two aromatic rings, and is largely divided into meta-type and para-type. The system is used for each material requiring strength.

In particular, para-aramid fibers not only have a high tensile strength of 20 g/d or more and a tensile modulus of about 500 to 1,000 g/d, but also have high heat resistance at a decomposition temperature of 400 ° C. It is a state-of-the-art material that maintains excellent cold resistance, insulation, and chemical resistance.

The basic physical properties of meta-aramid fibers are not significantly different from general-purpose synthetics, but they have flame resistance and flame retardancy, so they have high melting points, decomposition points, and secondary transition points, do not lose mechanical properties even at high temperatures, and have excellent long-term heat resistance. have it In addition, it has a high ignition point and flash point, and also has advantages in that the amount of gas generated during combustion, particularly the amount of toxic gas, is small.

These aramid materials are used in many ways as high-strength, high-heat-resistant fibers, and body armor, military combat uniforms, fire-fighting suits, and protective gloves are developed for unique uses of aramid utilizing high strength, high modulus of elasticity, heat resistance, cutting resistance, and melting resistance.

In addition, long aramid fibers are used for tire cords, rubber material reinforcement, civil engineering and construction reinforcement materials, and optical fiber tension member base materials. Instead of (flat yarn), crimped short-fiber spun yarn is used. In particular, for safety gloves, firefighting clothing, and protective clothing, crimping is applied to give stretch and wooly properties, so products with good feel and fit are being developed. It does not do it, and has the advantage of not having fine fluff.

However, in the case of the aramid short fiber spun yarn, short fibers may come out, so it is difficult to use it for work in a clean room handling precision equipment and parts. Therefore, in the clean room, textile products made from conventional long fiber processed yarns such as nylon are used, but the cut resistance is not satisfactory. it is becoming.

In order to make elastic fibers using long aramid fibers in order to meet these requirements, the polymer itself must have rubber elasticity or be made into coiled, spring-structured fibers. However, since high-strength meta-aramid fibers (Polyparaphenylene Terephthalamid, PPTA), which are aramid fibers, cannot expect rubber elasticity due to their polymer properties, a method of making them into coil-shaped spring-structured fibers is generally recommended.

In order to make such a spring-structured fiber, it is difficult to obtain a coil-shaped spring structure even if the fiber structure is fixed in a state in which the long aramid fibers are crimped and untwisted, due to the characteristics of the inherent properties of the aramid fibers. In addition, the manufacturing method of the processed yarn by dry heat setting is also difficult to apply in reality due to the non-thermal softening properties and non-melting properties of aramid fibers.

As such, para-aramid fibers are structurally difficult to undergo high thermal processing, i.e., false twist processing, due to their excellent physical properties and non-meltability. Processing is also difficult, so threading is required according to the filament supply ratio.

One of the yarn processing methods proposed here is air texturing. Currently, in the case of manufacturing air textured yarn (ATY) for industrial use, the simple manufacturing of Tadenier ATY using high-strength PET, nylon 6, nylon 66, and polypropylene materials is predominant.

In the air texturing process, since the strength of synthetic fiber filaments is strong, loops made of these filaments tend to be entangled and caught, so there is a problem in that they are tangled or cut during processing.

Republic of Korea Patent Publication 10-2012-0116728 (October 23, 2012) Republic of Korea Patent Publication 10-2016-0071715 (June 22, 2016)

The present invention has been devised to solve the above problems, and includes an aromatic polyamide filament yarn as a first raw material and a polyethylene terephthalate (PET) filament yarn as a second raw material, and the first raw material is para-polyamide Filament yarn 7 to 3 weight ratio: Meta-polyamide As it is composed including 3 to 7 weight ratio of filament yarn, it has all the characteristics of high strength and durability, which are characteristics of para-polyamide, and heat resistance and heat resistance, which are characteristics of meta-aramid, The purpose of this is to provide a manufacturing method of aramid polyethylene terephthalate hybrid twisted yarn and air entangled yarn (ATY) method that has improved bulkiness and workability by reducing the problems of entanglement or cutting during processing due to excellent pressure resistance and fatigue resistance.

The present invention relates to an aramid polyethylene terephthalate hybrid twisted yarn and a method for manufacturing the same by applying the air entangled yarn (ATY) method.

An aspect of the present invention includes an aromatic polyamide filament yarn as a first raw material, and a polyethylene terephthalate (PET) filament yarn as a second raw material, wherein the first raw material is para-polyamide filament yarn 7 to 3 weight ratio: meta- It relates to an aramid polyethylene terephthalate hybrid twisted yarn to which an air interlaced yarn method is applied, characterized in that it contains 3 to 7 weight ratio of polyamide filament yarn.

In addition, the aramid braided yarn obtained by plying the first raw material and the second raw material of the present invention is characterized in that the fineness value tested by the KS K ISO 2060 test method is 1000D to 2000D.

In addition, the aramid braid of the present invention is characterized in that the tensile strength value tested by KS K 0412 test method is 10N/kgf to 30N/kgf.

In addition, the aramid braid of the present invention is characterized in that the tensile elongation value tested by the KS K 0412 test method is 3.0% to 4.0%.

In addition, the aramid braid of the present invention is characterized in that the dry heat shrinkage is -0.5% to -0.1%.

In addition, the method of manufacturing the aramid polyethylene terephthalate (PET) hybrid yarn of the present invention is para-poly aramid filament yarn in the upper part, meta-poly aramid filament yarn in the lower part, and polyethylene terephthalate filament yarn is para-poly aramid filament yarn and meta-poly aramid yarn. A first step of supplying yarn from a position between filament yarns, a second step of twisting the yarn of the first step with an air entangled yarn (ATY) method to produce a ply-twisted yarn, and heat-treating the ply-twisted yarn after the second step It is characterized in that it includes a third step.

The manufacturing method of the aramid polyethylene terephthalate hybrid yarn and the air-entangled yarn (ATY) method according to the present invention is a mixture of para-aramid filament yarn and meta-aramid filament yarn, so strength, heat resistance, durability, pressure resistance, and fatigue resistance are used. As this is improved, damage due to friction and shape change due to high temperature can be prevented, so that it can be used for a long time.

In addition, by mixing the aromatic polyamide filament yarn and the polyethylene terephthalate filament yarn, the texture of the spun yarn can be imparted and problems from tangle or cut are prevented, thereby improving bulkiness and workability during the hybrid yarn yarn process.

1 is a flowchart of a method for manufacturing an aramid polyethylene terephthalate hybrid yarn according to a preferred embodiment of the present invention.

Hereinafter, examples and comparative examples will be described in more detail for its manufacturing method applying the aramid polyethylene terephthalate hybrid twisting and air interlocking yarn (ATY) method according to the present invention. However, the embodiments introduced below are provided as examples so that the spirit of the present invention can be sufficiently conveyed to those skilled in the art.

Therefore, the present invention is not limited to the embodiments presented below and may be embodied in other forms, and the embodiments presented below are merely described to clarify the spirit of the present invention, and the present invention is not limited thereto.

At this time, unless there are other definitions in the technical terms and scientific terms used, it has the meaning commonly understood by those of ordinary skill in the art to which this invention belongs, and in the following description, the subject matter of the present invention may be unnecessarily obscured. Descriptions of possible known functions and configurations will be omitted.

Also, the singular forms used in the specification and appended claims may be intended to include the plural forms unless the context specifically dictates otherwise.

In the present invention, the term “air entangled yarn” is also referred to as air textured yarn, and the filament yarn is injected into the injection tube at a high speed, and high-pressure air is sprayed in an oblique direction with respect to the injection direction to increase the pressure of the air. It refers to a product made in order to make the surface of a fabric or knitted fabric soft and feel like cotton by continuously beating the surface of the fiber to make it bulky like peach skin (peach skin hair).

In addition, in the present invention, the term “twisted yarn” refers to a thing giving a twist by adding more twist to a continuous fiber or spun yarn, or by combining two or more threads to give a twist or a twisted yarn.

Incidentally, as a general method of twisting the yarn, there are ordinary ones such as twisting and braiding, and special twisting or decorative twisting for special effects. The twist direction is distinguished, and the left twist is called left or Z twist, and the right twist is called coincidence (右撚) or S twist.

Machines used for the twisting include a ring twister and a flyer twister. In Korea, an Italian-style flyer twister is often used for long fiber twisting, and one rotation like a two one twister is used. There are also two twists on the . A special twister or fancy twister is used to create various unusual shapes and effects, such as decorative yarn.

The aramid polyethylene terephthalate hybrid yarn to which the air bridging method according to the present invention is applied includes an aromatic polyamide filament yarn as a first raw material, a polyethylene terephthalate (PET) filament yarn as a second raw material, and the first raw material and the second raw material characterized in that

In the present invention, the aromatic polyamide is a polyamide having an aromatic ring in the main chain. When the aromatic ring, which has a generally planar structure, enters the molecular chain, the flexibility or free rotation of the polymer decreases to become a rigid molecule, and the entropy of fusion is As it decreases, the melting point increases accordingly.

In addition, the aromatic polyamide is strongly linked because intermolecular hydrogen bonds also exist, and thus has structural rigidity, cleavage resistance, fire resistance, and non-reactivity to chemical attack.

In addition, the aramid of the present invention refers to an aromatic polyamide, and is distinguished from an aliphatic polyamide (nylon), and is characterized in that it has very excellent tensile strength and modulus compared to organic fibers or has excellent heat resistance.

In addition, the aramid filament yarn of the present invention can be divided into para-poly aramid filament yarn and meta-poly aramid filament yarn.

In addition, the para-poly aramid filament yarn has an amide bond attached to the benzene ring at the para-position (1, 4 position), so that the chain is spread widely and becomes a highly crystalline fiber yarn. It is used in body armor, cables, automobile construction, and aircraft weight reduction.

The meta-poly aramid filament yarn has an amide bond bonded to the benzene ring at the meta position (position 1, 3), and hydrogen bonded to a large aromatic (phenyl) group blocks it, so that the chains overlap each other in a twisted arrangement. As it becomes a yarn, it is used for electrical insulation, firefighting clothing, firefighting gloves, construction materials, tire cords, etc. because it has the characteristics of heat resistance and flame retardancy to withstand high heat of 500 degrees Celsius.

In addition, the first raw material of the present invention is para-polyaramid filament yarn 7 to 3 weight ratio: meta- polyaramid filament yarn 3 to 7 weight ratio is characterized in that it includes.

In addition, it is preferable to have a range of 7 to 3 weight ratio of para-poly aramid filament yarn: 3 to 7 weight ratio of meta-poly aramid filament yarn, but para-polyaramid filament yarn is stiff when added in excess of 7 weight ratio. Breakage occurs, and when added in less than 3 weight ratio, the strength is lowered, when meta-polyaramid filament yarn is added in less than 3 weight ratio, heat resistance is lowered and cannot be used for a long period of time, and when added in excess of 7 weight ratio, the weight is Since the problem of becoming heavy may occur, it is preferable to add the para-poly aramid filament yarn and the meta-poly aramid filament yarn in a weight ratio within the above range.

Accordingly, the para-poly aramid filament yarn and the meta-poly aramid filament yarn may be variously added in a weight ratio within the above range according to the physical properties desired by the user.

In addition, the polyethylene terephthalate (hereinafter referred to as PET) filament yarn, which is the second raw material of the present invention, has low hygroscopicity, has excellent shape stability, thermoplasticity, and strength, and ethylene glycol and terephthalene dicarboxylic acid or their Derivatives and minor amounts of units derived from one or more ester-forming components may be included as copolymer units.

In addition, the PET filament yarn generally has excellent heat resistance compared to polyvinyl alcohol (PVA) filament yarns used in the manufacture of ply-twisted yarns, and, in particular, has excellent mechanical properties due to a small decrease in modulus at high temperature, and the PVA filament yarn has the largest Looking at the hot water resistance side, which is a disadvantage, it can withstand boiling water at 100 degrees Celsius, but softens and shrinks at 120 degrees Celsius, and the strength decreases significantly around 180 degrees Celsius, so it is required to be used at temperatures below that, so it is necessary to secure hot water resistance. For this reason, it is necessary to adjust the saponification degree to a specific range and to take strict spinning conditions, but in the case of PET filament yarn, the manufacturing cost is much lower than that of PVA.

In addition to PET, polybutylene terephthalate, polyethylene naphthalate, polybutylene naphthalate, polyethylene-1,2-bis(phenoxy)ethane-4,4'-dicarboxylate, poly(1,4-cyclo hexylene-dimethylene terephthalate) and copolymers comprising at least one repeating unit of said polymer, for example polyethylene terephthalate/isophthalate copolyester, polybutylene terephthalate/naphthalate copolyester, polybutyl ren terephthalate/decanedicarboxylate copolyesters and mixtures of two or more of the foregoing polymers and copolymers. Among them, PET is particularly preferred in terms of mechanical properties and fiber formation.

When the PET filament yarn is braided with the para-poly aramid filament yarn and the meta-poly aramid filament yarn, as the tensile strength, tensile elongation, abrasion strength, rupture strength, etc. are increased, a hybrid yarn having high strength properties with improved bulkiness can be obtained.

In addition, the PET filament yarn is characterized in that it contains the mixed para-meta aramid filament yarn 5 to 8: PET filament yarn 2 to 5 weight ratio.

In addition, the PET filament yarn is preferably in the range of 5 to 8 by weight of the mixed para-meta aramid filament yarn: 2 to 5 weight ratio of the PET filament yarn, when the PET filament yarn is less than 2 weight ratio, the mixed para-meta aramid When the ratio of filament yarns increases, abrupt deterioration of physical properties may occur when exposed to sunlight, which is a disadvantage inherent in aramid fibers. It may be difficult to express the physical properties, so it is preferable to be added in a weight ratio within the above range.

On the other hand, the aramid braided yarn obtained by plying the first raw material and the second raw material of the present invention is characterized in that the fineness value tested by the KS K ISO 2060 test method is 1000D to 2000D.

In addition, the KS K ISO 2060 test method is a method generally used when measuring the thickness of a thread, and is a method of measuring the mass after collecting the aramid braid to 10 to 200 m. This allows the yarn count (denier, weight per unit length, abbreviation D) to be measured.

It is preferable that the aramid braided yarn has a fineness value in the range of 1000D to 2000D, but if it is less than 1000D, it cannot be used for a long time because the strength is weak and may be broken, and if it exceeds 2000D, there is a problem that it is heavy and stiff and can be broken. It is preferred to have a fineness value within the range.

In addition, the aramid braid of the present invention is tensile tested by the KS K 0412 test method. It is characterized in that the strength value is 10N/kgf to 30N/kgf.

In addition, the KS K 0412 test method can be classified into a constant rate of traverse (CRT), a constant rate of load (CRL), and a constant rate of extension (CRE), but in general As measured by a constant rate elongation method, which is a method used when measuring the strength and elongation of a filament yarn, the aramid braiding 20 to 50 cm is 50% for 1 minute or This is a method of measuring the load when cut at 100% tension. Through this, tensile strength can be measured.

The aramid braided yarn preferably has an experimental tensile strength value in the range of 10N/kgf to 30N/kgf, and when it is less than 10N/kgf, it is weak in friction, bending, and weathering, so shape stability is reduced and deformation is good, and 30N/kgf is If it is exceeded, it is preferable to have a tensile strength value within the above range because it may become stiff and break, resulting in a problem that cannot be used for a long period of time.

In addition, the aramid braided yarn is characterized in that the tensile elongation value tested by the KS K 0412 test method is 3.0% to 4.0%.

In addition, the tensile elongation value is the same as the tensile strength test method, but at room temperature, a tensile rate of 200 mm/min to 300 mm/min, and a humidity of 65%, the aramid plying 20 to 50 cm is 50% or 100% tensile for 1 minute It is a method of measuring the cut-off value. This allows measurement of tensile percentage elongation at break.

It is preferable that the aramid plywood has a tensile elongation value of 3.0% to 4.0% in the tested range. When it is less than 3.0%, the elasticity is low and may be broken, and when it exceeds 4.0%, the elasticity is high and the shape deformation occurs. It is preferable to have a tensile elongation value within the above range.

In addition, the aramid braided yarn is characterized in that the dry heat shrinkage is -0.5% to -0.1%.

In addition, the dry heat shrinkage rate is measured by ASTM D4974 (Test method for filament yarn shrinkage of synthetic fibers), and after leaving the aramid braided yarn in a constant temperature and humidity room at room temperature and humidity 65% for 24 hours, 0.1g/d to 0.05g/ Dry heat shrinkage was calculated using the ratio of the length measured at the load of d and the length after treatment at a load of 0.1 g/d to 0.05 g/d for 20 minutes to 1 hour in a drying furnace at 100 to 200 degrees. can be measured

It is preferable that the tested dry heat shrinkage of the aramid ply is in the range of -0.5% to -0.1%, and when it is less than -0.5%, the strength is reduced because the aramid ply is thin, and when it exceeds -0.1%, the ply is stiff and broken It is preferable to have a dry heat shrinkage value within the above range because there is a problem that can be reduced.

In addition, the aramid braided yarn is characterized in that the yarn tension is 200 to 500 g / d.

In addition, the tension force is measured using a tension meter, the aramid braid is fixed to the tension meter, the indicator setting is set to “0”, and the measurement value is read by locking the handle. Measure the average value by repeating measurements 3 to 4 times while changing positions at intervals of 30 cm. Through this, it is possible to measure the tensile strength of the aramid braid.

The aramid braided yarn preferably has a tested yarn tension in the range of 200 to 500 g / d, when it is less than 200 g / d, the process workability is reduced, and when it exceeds 500 g / d, it is difficult to give entanglement Therefore, it is preferable to have a dead force within the above range.

The tensile strength of the aramid braid is more preferably in the range of 300 to 400 g/d.

In addition, the aramid braided yarn is characterized in that the average thickness measured using a thickness meter is 300 to 500 μm (micrometer).

In addition, the average thickness of the aramid plying is obtained by measuring 20 to 30 times using a thickness meter having a scale unit of 1 μm to obtain an average value, and the measured aramid plying is measured by collecting plying at a distance of 2 to 3 m.

The aramid braided yarn preferably has a measured average thickness in the range of 300 to 500 μm, if it is less than 300 μm, it cannot be used for a long time because the strength is weak and may be broken, and if it exceeds 500 μm, it is heavy and stiff and has a problem that can be broken. It is desirable to have an average thickness within the range.

Hereinafter, as shown in FIG. 1, the manufacturing method for manufacturing the aramid polyethylene terephthalate hybrid ply-twisted yarn of the present invention as described above will be described in detail as follows.

In the method for producing an aramid polyethylene terephthalate hybrid ply-twisted yarn of the present invention, the para-poly aramid filament yarn is in the upper portion, the meta-poly aramid filament yarn is in the lower portion, and the polyethylene terephthalate filament yarn is in a position between the para-poly aramid filament yarn and the meta-poly aramid filament yarn. The first step of supplying the yarn (S10) and

After the second step (S20) of manufacturing the ply-twisted yarn by twisting the yarn of the first step (S10) with an air entangled yarn (ATY) method, and the second step (S20), the ply-twisted yarn is immersed so that an adhesive is applied. A third step (S30) and a fourth step (S40) of heat-treating the ply-twisted yarn after the third step, the aramid polyethylene terephthalate hybrid ply-twisted yarn is manufactured using a commonly used ring twisting machine do.

Specifically, in the first step (S10), the para-poly aramid filament yarn is at the top, the meta-poly aramid filament yarn is at the bottom, and the polyethylene terephthalate filament yarn is the para-poly aramid filament yarn and meta- at a position between the poly aramid filament yarn. can be supplied.

Next, in the second step (S20), each filament yarn is injected into a generally used air converging yarn (ATY) machine with a high-speed flow into the injection pipe, and high-pressure air is injected in an oblique direction with respect to the injection direction. The surface of the filament yarn is continuously beaten with air pressure to make it bulky like a peach skin so that the surface is smooth like cotton.

In addition, in the second step (S20), a para-poly aramid filament yarn and a meta-poly aramid filament yarn are wrapped around a polyethylene terephthalate (PET) filament yarn and twisted.

Specifically, in the second step (S20), when each filament yarn is injected into the injection pipe at a high speed, the polyethylene terephthalate (PET) filament yarn becomes the central yarn, and the polyethylene terephthalate filament yarn is para- Twisting is applied by applying the cabling method so that the poly aramid filament yarn and the meta-poly aramid filament yarn are wrapped around it.

In addition, when the cabling method is applied, para-poly aramid filament yarn and meta-poly aramid filament yarn are 900 to 1100 D (denier) or 1400 to 1600 D (denier), and polyethylene terephthalate filament yarn is 100 to 300 D It is preferable to use (denier) yarn.

The para-poly aramid filament yarn and meta-poly aramid filament yarn cannot be used for a long time because when a yarn of less than 900 denier is used, the strength is weak and can be broken, and when a yarn of more than 1600 denier is used, it is heavy and stiff and broken If a yarn of less than 100 denier of polyethylene terephthalate filament yarn is used, it may break due to low strength, and when a yarn exceeding 300 denier is used, there is a problem in that the spinnability is lowered. It is preferable to use a yarn having a thickness within the above range.

The para-poly aramid filament yarn and meta-poly aramid filament yarn are more preferably 950 to 1045 denier or 1455 to 1545 denier, and the polyethylene terephthalate filament yarn is preferably 200 to 300 denier.

In addition, the second step (S20) is characterized by a dead speed of 300 to 500 m/min, an air pressure of 1 to 15 kg/cm ² , and a dead force of 100 to 500 g/d. If the above range is not satisfied, the physical properties of the twist-processed hybrid yarn may be deteriorated, resulting in quality degradation.

Specifically, when the yarn speed is less than 300 m/min, the time required for the manufacturing process increases, so there is a disadvantage in that the cost increases in the process, and when it exceeds 500 m/min, the number of times air passes through the filament yarn As the number of bridging yarns decreases, the structure becomes loose, which may result in quality deterioration such as strength deterioration.

The yarn speed is preferably twisted at 300 to 400 m/min.

In addition, when the air pressure is ^{less than 1 kg/cm 2} , the entanglement is not completely made and an uneven loop may occur. When the air pressure ^{exceeds 15 kg/cm 2} , the filament yarn is damaged due to excessive air pressure. The physical properties of the ply-twisted yarn are deteriorated.

The air pressure is more preferably 3 to 9 kg/cm ² It is good to twist the process.

In addition, when the tensile strength is less than 100 g/d, the number of bridging yarns is reduced and the structure is loosened, so that quality deterioration such as strength reduction may occur. When the tensile strength exceeds 500 g/d, it is difficult to impart entanglement, and process workability is deteriorated.

The tension is more preferably 300 to 400 g / d, it is good to twist processing.

Next, the third step (S30) is characterized in that the hybrid ply-twisted yarn twisted after the second step (S20) is heat-treated.

Specifically, in the third step (S30), after the second step (S20), the hybrid ply-twisted yarn is heat-treated at 100 to 200 degrees, and then cooled at room temperature (20 to 25 degrees Celsius) to make the existing aramid filament yarn. It is possible to manufacture finished products of aramid polyethylene terephthalate hybrid ply-twisted yarns superior in manufacturing cost, reduction of defect rate, tear strength, burst pressure, heat resistance, chemical resistance, flame retardancy and workability than the ply-twisted yarn products of the spun yarn.

Hereinafter, the present invention will be described in more detail with reference to Examples and Comparative Examples. However, the above Examples and Comparative Examples are provided to help the understanding of the present invention, and the present invention is not limited to the following Examples and Comparative Examples.

The physical properties of the specimens prepared in the following Examples and Comparative Examples were tested as follows.

(Example 1)

250 denier meta-poly aramid filament yarn 42 wt %, 1500 denier para-poly aramid filament yarn 18 wt %, 150 denier polyethylene terephthalate filament yarn 40 wt % para-poly aramid filament yarn from the top, meta -Poly aramid filament yarn is supplied from the bottom, and polyethylene terephthalate filament yarn is supplied at a position between the para-poly aramid filament yarn and the meta-poly aramid filament yarn, and each yarn is twisted under the conditions of 8.0 T/cm and 6500 rpm. 320m/min, air pressure 9.5kg/cm ² , gear ratio 53/50, polyethylene terephthalate filament yarn overfeed rate (((feed roller yarn speed - pin plate speed) / in pin plate) * 100) 1.2% , Para-poly aramid filament yarn and meta-poly aramid filament yarn overfeed rate of 2% The nozzle used TEXJET D12 to prepare an aramid polyethylene terephthalate hybrid ply-twisted yarn by air entangled yarn (ATY) method. .

(Example 2)

36 wt% of 250 denier meta-aramid filament yarn, 24 wt% of 1500 denier para-aramid filament yarn, and 40 wt% of 150 denier polyethylene terephthalate filament yarn were used, and a hybrid ply-twisted yarn was prepared in the same manner as in Example 1.

(Example 3)

250 denier meta-aramid filament yarn 30% by weight, 1500 denier para-aramid filament yarn 30% by weight, and 150 denier polyethylene terephthalate filament yarn 40% by weight were used, and a hybrid ply-twisted yarn was prepared in the same manner as in Example 1.

(Example 4)

24 wt% of 250 denier meta-aramid filament yarn, 36 wt% of 1500 denier para-aramid filament yarn, and 40 wt% of 150 denier polyethylene terephthalate filament yarn were used, and a hybrid ply-twisted yarn was prepared in the same manner as in Example 1.

(Example 5)

18 wt% of 250 denier meta-aramid filament yarn, 42 wt% of 1500 denier para-aramid filament yarn, and 40 wt% of 150 denier polyethylene terephthalate filament yarn were used, and a hybrid ply-twisted yarn was prepared in the same manner as in Example 1.

(Comparative Example 1)

A para-meta-aramid ply-twisted yarn was prepared in the same manner as in Example 1, except that 70 wt% of 250 denier meta-aramid filament yarn and 30 wt% of 1500 denier para-aramid filament yarn were used.

(Comparative Example 2)

A para-meta-aramid ply-twisted yarn was prepared in the same manner as in Example 1, except that 30 wt% of 250 denier meta-aramid filament yarn and 70 wt% of 1500 denier para-aramid filament yarn were used.

(Comparative Example 3)

100% by weight of 150 denier polyethylene terephthalate filament yarn was prepared by heat treatment at 150° C. for 20 minutes after standing in a constant temperature and humidity room at 20° C. and 65% humidity for 24 hours.

(Evaluation standard)

The fineness (D), tensile strength, tensile elongation, dry heat shrinkage, tensile strength, and average thickness of the ply-twisted yarns of Examples 1 to 5 and Comparative Example 1 were measured and described, and Table 1 below shows the percentage of filament yarn by weight It was described as a standard.

(intensity measurement)

According to ASTM D885 standard, the tensile strength of the hybrid ply-twisted yarn was measured using a universal tensile tester and evaluated as follows. The unit is expressed as g (weight)/d (fineness, denier).

1100 to 1000 g/d: 10 points

999 to 900 g/d: 9.0 points

899 to 800 g/d: 8.0 points

799 to 600 g/d: 7.0 points

Less than 500g/d: 6.0 points

(Measurement of heat resistance)

The hybrid ply-twisted yarn was allowed to stand for 30 minutes at 200 degrees from 400 degrees to 1000 degrees, and then the tensile strength of the ply-twisted yarn was measured and evaluated as follows. The unit is expressed as g (weight)/d (fineness, denier).

1100 to 1000 g/d: 10 points

999 to 900 g/d: 9.0 points

899 to 800 g/d: 8.0 points

799 to 600 g/d: 7.0 points

Less than 500g/d: 6.0 points

(Measurement of chemical resistance)

After being immersed in 5N sodium hydroxide aqueous solution and 5N sulfuric acid aqueous solution in a constant temperature and humidity room at 200 degrees Celsius and 65% humidity for 24 hours, respectively, the tensile strength retention of the hybrid ply-twisted yarn was measured and evaluated as follows. The unit is expressed in %.

100 to 95%: 10 points

94 to 90%: 9.0 points

89 to 85%: 8.0 points

84 to 80%: 7.0 points

Less than 79%: 6.0 points

(Measurement of flame retardancy)

The limiting oxygen index (LOI) method was used to measure the minimum oxygen content in the atmosphere required to ignite the hybrid yarn and evaluated as follows. The unit is expressed in %.

30 to 27%: 10 points

26 to 24%: 9.0 points

23 to 21%: 8.0 points

20 to 18%: 7.0 points

Less than 17%: 6.0 points

In Table 2 below, the strength, heat resistance, weakness resistance, and flame retardancy of Examples 1 to 5 and Comparative Example 1 were described with respect to the above measured values.

Example 1 Example 2 Example 3 Example 4 Example 5 Comparative Example 1 Comparative Example 2 Comparative Example 3 filament yarn Para-aramid 42 36 30 24 18 70 30 - meta-aramid 18 24 30 36 42 30 70 - PET 40 40 40 40 40 - - 100 Tensile strength (N/kgf) 30 27 25 23 21 20 16 14 Tensile Elongation (%) 4.0 3.8 3.6 3.4 3.2 3.1 3.0 3.7 Dry heat shrinkage (%) -0.1 -0.15 -0.17 -0.20 -0.23 -0.4 -0.45 -0.51 Tension force (g/d) 280 300 350 310 290 250 240 200 Average thickness of ply-twisted yarn (μm) 407 415 427 411 402 395 389 373

Example 1 Example 2 Example 3 Example 4 Example 5 Comparative Example 1 Comparative Example 2 Comparative Example 3 burglar 9.0 8.0 8.0 7.0 7.0 7.0 6.0 6.0 heat resistance 7.0 7.0 8.0 8.0 9.0 6.0 7.0 6.0 chemical resistance 7.0 7.0 8.0 8.0 9.0 6.0 7.0 6.0 flame retardant 7.0 7.0 8.0 8.0 9.0 6.0 7.0 6.0

As described in Table 1 and Table 2, Examples 1 to 5 may have different physical properties depending on the mixing weight % of para-aramid filament yarn, meta-aramid filament yarn, and PET filament yarn, but Comparative Examples 1 to As in Comparative Example 2, it can be seen that the strength, heat resistance, chemical resistance, and flame retardancy are high compared to the case where only the para-aramid filament yarn and the meta-aramid filament yarn are mixed or when only the PET filament yarn is used as in Comparative Example 3.

In addition, in the case of Examples 1 to 2, in which the addition amount of para-aramid filament yarn is higher than that of meta-aramid filament yarn in Examples 1 to 5, the strength is relatively increased compared to Example 3, but on the other hand, heat resistance, Chemical resistance and flame retardancy are lowered, and in the case of Examples 4 to 5 in which the addition amount of para-aramid filament yarn is lower than that of meta-aramid filament yarn, heat resistance, chemical resistance, and flame retardancy are similar or increased than in Example 3, but the strength is is lowered

More specifically, in Examples 1 to 2, the chemical bonding distance between the amide group hydrogen of the para-aramid filament and the carbonyl group oxygen of the PET filament is short, and the strength is increased due to the increase in the mutual bonding force, In Examples 4 to 5, the chemical bonding distance between the hydrogen of the amide group of the meta-aramid filament and the oxygen of the carbonyl group of the PET filament is long, so that the bonding force between them is reduced and the strength is decreased.

In addition, as described in Table 2, examples 1 to 3 based on Example 3 in which para-aramid filament yarn, meta-aramid filament yarn, and PET filament yarn were mixed in 30 wt%: 30 wt%: 40 wt% Comparing Example 5, Example 1 has high strength compared to Example 3, but has low heat resistance, chemical resistance, and flame retardancy, and Example 2 has similar strength to Example 3, but has low heat resistance, chemical resistance, and flame retardancy. Examples 4 to 5 have high heat resistance, chemical resistance, and flame retardancy compared to Example 3, but have low strength.

[Manufacturing of vehicle brake hose]

After application to a vehicle brake hose using the hybrid ply-twisted yarns prepared in Examples 1 to 5 and Comparative Examples 1 to 3, changes in the hybrid ply-twisted yarn to temperature change and repeated stress (bending), that is, defects was observed.

(Measurement of defects and fatigue resistance during rotation)

If rotation is applied while the brake hose is filled with fluid at a constant pressure, if the pressure inside the brake hose is reduced during rotation, harmful defects such as cracks, water leakage and local expansion are measured in the brake hose.

The defect can be determined whether the brake hose is defective by whether the pressure is reduced through a pressure gauge, and fatigue resistance of the brake hose can be measured by measuring the number of revolutions at the time of decompression.

150,000 to 141,000 rotations: 10.0 points

140,000 to 131,000 rotations: 9.0 points

130,000 to 121,000 revolutions: 8.0 points

120,000 to 111,000 rotations: 7.0 points

Less than 110,000 revolutions: 6.0 points

(Measurement of defects during repeated pressurization)

While fixing one end of the brake hose and leaving the other end free, repeatedly pressurize the inside of the brake hose through the fixed one end. At this time, the DOT4 brake solution is filled inside through the fixed one end, and the pressure test is repeated 150,000 times at a pressure of 10 MPa or less, a pressure cycle of 2500 cycles/hr, and a temperature of 100 degrees. The presence or absence of defects was observed.

Cracks, leaks, and local expansion all occur: O

1 or 2 of cracks, leaks, and local expansion: △

No cracks, leaks, or local expansion: X

Example 1 Example 2 Example 3 Example 4 Example 5 Comparative Example 1 Comparative Example 2 Comparative Example 3 fatigue resistance 8.0 9.0 10.0 9.0 8.0 7.0 7.0 6.0 absence of defects X X X X X △ △ O

As shown in Table 3, in the case of Examples 1 to 5 in which meta-aramid filament yarns, para-aramid filament yarns, and PET filament yarns were mixed, meta-aramid filament yarns and para-aramid filament yarns were mixed only Comparative Examples It can be seen that the fatigue resistance is higher than that of Comparative Example 3 using only 1 to 2 and PET filament yarns.

In particular, in Table 3, when only PET filament yarns were used, all defects occurred, and in the case of ply-twisted yarns in which only para-aramid filament yarns and meta-aramid filament yarns were mixed, 1 to 2 defects were generated, and para-aramid filament yarns. , it can be seen that, in the case of a hybrid ply-twisted yarn in which a meta-aramid filament yarn and a PET filament yarn are mixed, there is no defect.

In addition, when manufactured as a brake hose, fatigue resistance due to high temperature and high pressure and corrosion resistance due to brake solution, that is, chemical resistance should be high. Examples 1 to 2 have higher strength than Example 3, but chemical resistance, The flame retardancy and heat resistance are low, the thermal fatigue properties are lowered, and Examples 4 to 5 have high chemical resistance, flame retardancy, and heat resistance, but low strength. On the other hand, Example 3 has lower strength than Examples 1 to 2, but has excellent physical properties of fatigue resistance, chemical resistance, flame retardancy, and heat resistance. have.

As mentioned above, although the present invention has been described with reference to the illustrated embodiment, it will be understood that this is merely exemplary, and that various modifications and equivalent embodiments are possible therefrom by those of ordinary skill in the art. Accordingly, the true scope of protection of the present invention should be defined only by the appended claims.

Claims (8)

Aromatic polyaramid filament yarn as a first raw material; and
Polyethylene terephthalate (PET) filament yarn as a second raw material;
including,
The first raw material is
Para-polyaramid filament yarn 7 to 3 weight ratio: meta-polyaramid filament yarn is composed of 3 to 7 weight ratio,
The para-poly aramid filament yarn is at the top, meta-poly aramid filament yarn is at the bottom, and the polyethylene terephthalate filament yarn is para-poly aramid filament yarn and meta-poly aramid filament yarn. Aramid polyethylene terephthalate (PET) hybrid twisted yarn, characterized in that it is manufactured by heat-treating the ply-twisted yarn after manufacturing the ply-twisted yarn by twisting.
According to claim 1,
The aramid braided yarn in which the first raw material and the second raw material are braided,
Aramid polyethylene terephthalate (PET) hybrid yarn, characterized in that the fineness value tested by the KS K ISO 2060 test method is 1000D to 2000D.
According to claim 1,
The aramid braided yarn in which the first raw material and the second raw material are braided,
Aramid polyethylene terephthalate (PET) hybrid yarn, characterized in that the tensile strength value tested by KS K 0412 test method is 10N/kgf to 30N/kgf.
According to claim 1,
The aramid braided yarn in which the first raw material and the second raw material are braided,
Aramid polyethylene terephthalate (PET) hybrid yarn, characterized in that the tensile elongation value tested by KS K 0412 test method is 3.0% to 4.0%.
According to claim 1,
The aramid braided yarn in which the first raw material and the second raw material are braided,
Aramid polyethylene terephthalate (PET) hybrid yarn, characterized in that dry heat shrinkage of -0.5% to -0.1%.
In the method for producing an aramid polyethylene terephthalate (PET) hybrid yarn 100,
Para-poly aramid filament yarn at the top, meta-poly aramid filament yarn at the bottom, polyethylene terephthalate filament yarn at the bottom, para-poly aramid filament yarn and meta- a first step of supplying yarn at a position between the poly aramid filament yarn (S10);
a second step (S20) of twisting the yarn of the first step (S10) with an air entangled yarn (ATY) method to produce a ply-twisted yarn (S20); and
a third step (S30) of heat-treating the ply-twisted yarn after the second step (S20);
A method of manufacturing an aramid polyethylene terephthalate hybrid yarn to which an air bridging yarn (ATY) method is applied, characterized in that it comprises a.
7. The method of claim 6,
The second step (S20) is
Para-poly aramid filament yarn and meta-poly aramid filament yarn wrapped around polyethylene terephthalate filament yarn (PET), characterized in that the twisted aramid polyethylene terephthalate hybrid yarn manufacturing method applying the air entangled yarn (ATY) method.
7. The method of claim 6,
The second step (S20) is,
Yarn speed 300 to 500 m / min, air pressure 1 to 15 kg / cm ² , A method of manufacturing an aramid polyethylene terephthalate hybrid yarn to which an air entangled yarn (ATY) method is applied, characterized in that the yarn tension is 100 to 500 g/d.

Images