KR20120111417A - Polyester fabrics and preparation method thereof - Google Patents

Abstract

PURPOSE: A fabric for an air bag and a method for fabricating the same are provided to minimize shock and to safely protect passengers. CONSTITUTION: A polyester fabric contains polyester yarn with 300-700 denier. The polyester fabric has 0.8 or more of warp direction PTSRi^wa(PTSRI^wa= PTS3000^wa/PTS^wa), weft direction PTSRI^we(PTSRI^we= PTS3000^we/PTS^we), warp direction PSSRI^wa(PSSRI^wa= PSS_3000^wa/PSS^wa) index, and weft direction PSSRI^we(PSSRI^we= PSS_3000^we/PSS^we) index. The tensile strength of the fabric is 25kgf or more of PTS^wa, PTS^we, PTS_3000^wa, and PTS_3000^we. The toughness of the polyester fabric is more than 3.2 Kj/m^3. [Reference numerals] (AA) Before aging(warp direction); (BB) Tensile strength(kgf); (CC) 3000 hours after aging(warp direction); (DD) Before aging(weft direction); (EE) 3000 hours after aging(weft direction); (FF) Embodiment 5

Description

Polyester fabric and manufacturing method thereof {POLYESTER FABRICS AND PREPARATION METHOD THEREOF}

The present invention relates to a fabric for airbags and a method of manufacturing the same, and more particularly to polyester fabrics having excellent toughness and energy absorption performance even after prolonged high temperature heat treatment, including polyester yarns of high strength, high elongation and low modulus The present invention relates to a vehicle airbag including the same.

In general, an air bag detects a collision shock applied to a vehicle at a speed of about 40 km / h or more at a speed of about 40 km / h, and then explodes a gunpowder to gas into the airbag cushion. By supplying and expanding, it refers to a device that protects the driver and passengers.

Items required for airbag fabrics include low breathability for smooth deployment in the event of a crash, high strength to prevent damage and rupture of the airbag itself, high heat resistance, and flexibility to reduce impact on passengers.

In particular, the airbags used in automobiles are manufactured in a certain form, and then folded in order to minimize the volume of the airbags. Allow it to expand and deploy.

Therefore, in order to effectively maintain the folding and packageability of the airbag when installing the vehicle, to prevent damage and rupture of the airbag itself, to exhibit excellent airbag cushion deployment performance, and to minimize the impact on passengers, the airbag fabric has excellent mechanical properties. In addition, foldability and flexibility to reduce the impact on passengers is very important. However, airbag fabrics that maintain excellent air blocking effect and flexibility at the same time for the safety of the passengers, sufficiently endure the impact of airbags and can be effectively mounted in a vehicle have not been proposed.

Conventionally, polyamide fiber such as nylon 66 is used as a material for airbag yarn, but nylon 66 has excellent impact resistance, but is inferior to polyester fiber in terms of moisture resistance, heat resistance, light stability, shape stability, and has a very high raw material price. have.

On the other hand, Japanese Patent Application Laid-Open No. 04-214437 proposes the use of polyester fibers in which such defects are alleviated. However, in the case of manufacturing air bags using conventional polyester yarns, it is difficult to store them in a narrow space when mounted in a vehicle due to high stiffness, and excessive heat shrinkage occurs at high temperature heat treatment due to high elasticity and low elongation. In addition, there have been limitations in maintaining sufficient mechanical properties and development performance under high temperature harsh conditions.

Therefore, the airbag cushion maintains excellent mechanical properties and air-blocking effect, which is suitable for use as a fabric for vehicle airbags, and is flexible, storage, and long-term storage state to reduce impacts on passengers. There is a need for research on the development of textile fabrics having properties that maintain excellent physical properties even under high temperature and harsh conditions.

The present invention is to provide a polyester fabric that ensures excellent mechanical properties, flexibility, storage properties to be used in the fabric for airbags, and maintains sufficient performance under prolonged high temperature harsh conditions.

The present invention also provides a method of manufacturing the polyester fabric.

The present invention also provides a vehicle airbag comprising the polyester fabric.

The present invention includes a polyester yarn having a fineness of 300 to 700 denier, the inclined direction PTSRI ^wa index of the fabric as shown in the following formula 1 is 0.8 or more, the weft direction PTSRI ^we index of the fabric as shown in the following formula 2 Is 0.8 or more, and the warp direction PSSRI ^wa index of the fabric as shown in the following Formula 3 is 0.8 or more, and the weft direction PSSRI ^we index of the fabric as shown in the following Formula 4 is 0.8 or more.

[Equation 1]

PTSRI ^wa = PTS ₃₀₀₀ ^wa / PTS ^wa

[Equation 2]

PTSRI ^we = PTS ₃₀₀₀ ^we / PTS ^we

[Equation 3]

PSSRI ^wa = PSS ₃₀₀₀ ^wa / PSS ^wa

[Equation 4]

PSSRI ^we = PSS ₃₀₀₀ ^we / PSS ^we

In the above formula,

PTSRI ^wa and PTSRI ^we were maintained at 110 ° C for 3,000 hours, and then the tear strength retention index (PTSRI: Polyester Tearing) was measured according to the fabric specification E668992 test specification for Autoliv airbags. Strength Retention Index)

The PSSRI ^wa and PSSRI ^we are maintained in the inclined and weft direction of the fabric seam strength (PSSRI: Polyester Seam Strength) measured according to the fabric specification E668992 test specification for Autoliv airbag after heat treatment at 110 ℃ for 3,000 hours. Retention Index)

PTS ^wa and PTS ^we are the tear strength (kgf) in the warp direction and weft direction of the fabric measured at room temperature according to the fabric specification E668992 test specification for Autoliv airbag, respectively.

PTS ₃₀₀₀ ^wa and PTS ₃₀₀₀ ^we are the tear strength (kgf) in the warp direction and weft direction of the fabric measured according to the fabric specification E668992 test specification for Autoliv airbag after heat treatment at 110 ° C for 3,000 hours, respectively.

PSS ^wa and PSS ^we are the bark strength (N) in the warp direction and weft direction of the fabric measured at room temperature according to the fabric specification E668992 test specification for Autoliv airbag, respectively.

PSS ₃₀₀₀ ^wa and PSS ₃₀₀₀ ^we are the barn strength (N) in the warp direction and weft direction of the fabric measured according to the fabric specification E668992 test specification for Autoliv airbags after heat treatment at 110 ° C for 3,000 hours.

The present invention also provides the airbag comprising the steps of weaving the dough for airbags with a polyester yarn having a fineness of 300 to 700 deniers, refining the dough for the woven airbags, and tentering the refined fabric. It provides a method for producing a polyester fabric for.

The present invention also provides a vehicle airbag comprising the polyester fabric for the airbag.

Hereinafter, a polyester fabric according to a specific embodiment of the present invention, a manufacturing method thereof, and a vehicle airbag including the same will be described in more detail. However, this is presented as an example of the invention, whereby the scope of the invention is not limited, it is apparent to those skilled in the art that various modifications to the embodiments are possible within the scope of the invention.

In addition, throughout this specification, "comprising" or "containing ", unless specifically stated, refers to including any and all components (or components) Can not be interpreted as excluding.

In the present invention, the airbag fabric refers to a fabric or a nonwoven fabric used in the manufacture of an airbag for an automobile. As a general airbag fabric, a nylon 66 plain fabric or a nylon 66 nonwoven fabric woven with a rapier loom or an airjet loom. Although it is used, the airbag fabric of the present invention is characterized by excellent physical properties such as form stability, toughness, air permeability, ductility using a polyester yarn.

However, in order to apply polyester as an airbag yarn instead of polyamide fiber such as conventional nylon 66, long-term high temperature heat treatment due to the low folding heat and low melting heat capacity due to high modulus and stiffness of polyester yarn Under the conditions, it should be possible to overcome the deterioration of physical properties and consequently the deterioration of development performance.

Polyester has a high stiffness structure compared to nylon in the molecular structure has a high modulus characteristics. For this reason, when used as a fabric for airbags to be mounted on a car, the packing (packing) is significantly reduced. In addition, the carboxyl end groups (hereinafter referred to as "CEG") in the polyester molecular chain attack the ester bond under high temperature and high humidity conditions to cause molecular chain cleavage, thereby deteriorating physical properties after aging. Cause.

Accordingly, the present invention by using a high modulus low modulus polyester yarn to optimize the physical properties of the yarn fineness, tear strength of the fabric, bark strength, etc., while significantly lowering the stiffness and excellent mechanical properties and air As the blocking performance can be maintained, improved physical properties can be obtained as an airbag fabric.

Particularly, as a result of the experiments of the present inventors, as the airbag cushion is manufactured from a polyester fabric having predetermined characteristics, it shows more improved folding property, form stability, and air blocking effect, so that when used as a fabric for airbags, it has better storage performance (e.g. It has been found that excellent mechanical properties, airflow prevention, and airtightness can be maintained even under severe conditions of packing and high temperature and high humidity.

In accordance with one embodiment of the present invention, a polyester fabric having a predetermined characteristic is provided. Such a polyester fabric, that is, a polyester fabric for an air bag, includes a polyester yarn having a fineness of 300 to 700 deniers, and the inclination direction PTSRI ^wa index of the fabric as shown in Equation 1 is 0.8 or more, The weft direction PTSRI ^we index of the fabric as shown is 0.8 or more, the warp direction PSSRI ^wa index of the fabric as shown in the following formula 3 is 0.8 or more, and the weft direction PSSRI ^we index of the fabric as shown in the following formula 4 is 0.8 It can be abnormal.

[Equation 1]

PTSRI ^wa = PTS ₃₀₀₀ ^wa / PTS ^wa

[Equation 2]

PTSRI ^we = PTS ₃₀₀₀ ^we / PTS ^we

[Equation 3]

PSSRI ^wa = PSS ₃₀₀₀ ^wa / PSS ^wa

[Equation 4]

PSSRI ^we = PSS ₃₀₀₀ ^we / PSS ^we

In the above formula,

PTSRI ^wa and PTSRI ^we were maintained at 110 ° C for 3,000 hours, and then the tear strength retention index (PTSRI: Polyester Tearing) was measured according to the fabric specification E668992 test specification for Autoliv airbags. Strength Retention Index)

The PSSRI ^wa and PSSRI ^we are maintained in the inclined and weft direction of the fabric seam strength (PSSRI: Polyester Seam Strength) measured according to the fabric specification E668992 test specification for Autoliv airbag after heat treatment at 110 ℃ for 3,000 hours. Retention Index)

PTS ^wa and PTS ^we are the tear strength (kgf) in the warp direction and weft direction of the fabric measured at room temperature according to the fabric specification E668992 test specification for Autoliv airbag, respectively.

PTS ₃₀₀₀ ^wa and PTS ₃₀₀₀ ^we are the tear strength (kgf) in the warp direction and weft direction of the fabric measured according to the fabric specification E668992 test specification for Autoliv airbag after heat treatment at 110 ° C for 3,000 hours, respectively.

PSS ^wa and PSS ^we are the bark strength (N) in the warp direction and weft direction of the fabric measured at room temperature according to the fabric specification E668992 test specification for Autoliv airbag, respectively.

PSS ₃₀₀₀ ^wa and PSS ₃₀₀₀ ^we are the barn strength (N) in the warp direction and weft direction of the fabric measured according to the fabric specification E668992 test specification for Autoliv airbags after heat treatment at 110 ° C for 3,000 hours.

As a result of the experiments of the present inventors, the polyester yarn having a high modulus and a high modulus low modulus compared to the conventional polyester yarn is used to optimize the tear strength and the bark strength of the fabric, thereby effectively absorbing the energy of the hot-high pressure gas. It has been found that a fabric for an airbag can be provided that can withstand it. In particular, the fabric may include a low fineness high strength polyester yarn, the polyester yarn may be a fineness of 300 to 700 denier. In addition, the polyester fabric is PTSRI ^wa PTSRI ^we , PSSRI ^wa , and PSSRI ^we index of the fabric as shown in the formula 1 to 4 measured after the heat treatment at 110 ℃ for 3,000 hours is 0.80 or more, preferably 0.82 or more, More preferably 0.84 or more, which can be achieved by optimizing the physical properties of the polyester yarn and the fabric. By optimizing the properties of yarn and fabric, the polyester fabric for airbags has improved toughness and energy absorption performance compared to conventional PET fabrics, solves high stiffness problems, and has excellent flexibility and storage properties. Can be represented.

In the present invention, in order to effectively absorb the impact energy generated instantaneously during the operation of the airbag by controlling the fineness, tear strength, bark strength, etc. of the yarn constituting the fabric at the same time in the optimum range together with the mechanical properties and folding properties of the final fabric It can increase. It is necessary to simultaneously optimize the tear strength and the bark strength in order for the fabric to safely absorb the instantaneous impact energy of the exhaust gas generated by the explosives inside the air bag, and at the same time to achieve effective deployment and excellent folding properties. At this time, the tear strength and the bark strength of the fabric in the present invention needs to be able to satisfy the tear strength maintenance index and the bark strength maintenance index range of the fabric as described above.

In particular, the tear strengths of the fabrics represented by the formulas 1 and 2, PTS ^wa , PTS ^we , PTS ₃₀₀₀ ^wa , and PTS ₃₀₀₀ ^we , that is, the phosphorus of the fabric measured after the heat treatment for 3,000 hours at room temperature and 110 ℃ before heat treatment The thermal strength can be at least 25 kgf or 25 to 85 kgf, preferably at least 27 kgf or 27 to 83 kgf, respectively. In addition, the bark strength of the fabric represented by the formulas 3 and 4 PSS ^wa , PSS ^we , PSS ₃₀₀₀ ^wa , and PSS ₃₀₀₀ ^we , that is, the bark strength of the fabric measured after the heat treatment for 3,000 hours at room temperature and 110 ℃ before heat treatment The bar strength may be 700 N or more, or 700 N to 1,600 N, preferably 750 N or more, or 750 N to 1,500 N, respectively.

Here, the polyester fabric of the present invention is required to have a superior tear strength level because it is expanded rapidly by the high-temperature gas, the tear strength indicating the burst strength of the fabric for the airbag is Autoliv (Autoliv) in the coating fabric state ) Airbag Fabric Specification E668992 According to the test specification, it may be 25 kgf or more, or 25 to 85 kgf, preferably 27 kgf or more, or 27 to 83 kgf when measured at room temperature. However, the tear strength of the polyester fabric in the non-coated fabric state is 20 kgf or more or 20 to 80 kgf, preferably 22 kgf when measured at room temperature according to the test specification for the Autoliv airbag fabric specification E668992. Or 22 to 78 kgf. Here, when the tear strength of the airbag fabric is less than the lower limit, that is, 20 kgf and 25 kgf, respectively, in the uncoated fabric and the coated fabric, the airbag bursts when the airbag is deployed, which may cause a great risk to the airbag function. It may be. It is desirable to keep the tear strength of the fabric as high as possible, but if it is excessively increased, the edge comb resistance of the fabric is lowered, and the air barrier property may deteriorate rapidly during airbag deployment.

In this way, by maintaining the tear strength of the fabric to 25 kgf or more and at the same time the bark strength of the fabric to 700 N or more, if the polyester has a high tear strength and bark strength with high toughness of the fabric basically The fabric can ensure sufficient energy absorption performance in actual airbag cushion deployment. If the tear strength and the bark strength of the fabric cannot be maintained above the minimum value, it may cause tearing of the fabric and slippage of the sewing part during airbag cushion deployment due to the actual car collision, which may not protect the passengers of the car and may cause great damage. It may be clothed.

In addition, the PTSRI ^wa PTSRI ^we , PSSRI ^wa , and PSSRI ^we index of the fabric after the heat treatment of the fabric should be maintained at 0.8 or more, as shown in the equations 1 to 4, which is for a long time before the airbag deployment by the car crash Due to the nature of the airbag cushion, which may be stored in the car module under high temperature weather conditions, the airbag fabric absorbs high-high pressure inflator pressure during airbag deployment due to a car crash even if the airbag module is stored for a long time. The meaning of the value is important in terms of protecting the system.If the value is less than 0.8, it is left for a long time under the high temperature condition of the airbag module. The worst thing can happen.

Polyester fabric for the air bag of the present invention may be a toughness (Toughness) defined by the following formula (5) of 3.2 kJ / ㎥ or more or 3.2 kJ / ㎥ to 6.5 kJ / ㎥.

[Equation 5]

In Formula 5,

F represents the load applied when the length of the polyester fabric increases by dl,

dl represents the length of the polyester fabric.

The polyester fabric can effectively absorb and withstand the energy of hot-high pressure gas as it satisfies a higher level of toughness (fracture) than the conventional fabric. In this case, the toughness is energy consumed until the fabric is broken by the tensile force, as represented by Formula 5, and means the resistance of the fiber to a sudden impact. If a fiber increases its length from l to l + dl at load F, then the work is F? Dl, so the toughness required to cut the fiber is as shown in Equation 5 above. That is, such toughness represents the cross-sectional area of the yarn and the fabric's strength-elongation curve (see FIG. 1), and the higher the strength and elongation of the yarn used in the fabric, the higher the toughness expressed in the fabric. In particular, when the toughness of the fabric for the airbag is lowered, the resistance of the fabric capable of sufficiently absorbing the instantaneous deployment impact of the inflator having a high temperature-high pressure during airbag deployment becomes low, resulting in the fabric of the airbag being easily torn. Therefore, when the toughness of the fabric in the present invention, for example, less than 3.2 kJ / ㎥ may be difficult to apply to the fabric for the airbag.

As described above, the polyester fabric uses high modulus and high modulus low modulus yarns, thereby securing excellent edge comb resistance to obtain mechanical properties of the final fabric, energy absorption performance of high temperature and high pressure gas, and folding properties. And the like can be improved at the same time. In particular, the polyester fabric according to the present invention may have a sliding resistance of 280 N or more or 280 to 1100 N measured at room temperature (25 ° C.) by the American Society for Testing and Materials Standard ASTM D 6479 method. In addition, the polyester fabric may have a sliding resistance of 240 N or more or 240 to 1000 N measured at 90 ℃. At this time, the deactivation resistance of the polyester fabric is measured at room temperature (25 ℃) and 90 ℃, when less than 280 N and less than 240 N, respectively, the fabric strength of the airbag cushion sewing area is rapidly worsened when the air bag is deployed, the actual air bag deployment In the fabric, a pinhole and a tearing of the fabric may occur due to a bark push phenomenon, which may be undesirable.

In this case, the polyester fabric may have a warp density and a weft density, that is, a weaving density of the warp direction and the weft direction may be 36 to 65, respectively. The inclined density and the weft density of the polyester fabric may be 36 or more in terms of securing the toughness and desorption resistance of the fabric for the airbag, respectively, and 65 or less in terms of improving the folding property and lowering the tear strength of the fabric. Can be.

In addition, the airtightness in the polyester fabric is to minimize the elongation by the high-pressure air or the like, and at the same time to maximize the energy absorption performance in the discharge of gas at high temperature and high pressure to ensure sufficient mechanical properties during operation of the airbag. very important. Accordingly, the fabric may be further woven and processed so that the cover factor of the fabric becomes 1,800 to 2,460 according to Formula 6, thereby improving airtightness and energy absorption performance during airbag deployment.

[Equation 6]

Cover Factor (CF)

Herein, when the cover factor of the fabric is less than 1,800, air may easily be discharged to the outside when the air is inflated. When the cover factor of the fabric exceeds 2,460, the storage and folding properties of the airbag cushion are remarkably increased when the airbag is installed. Can fall.

Polyester fabric according to the present invention, the shrinkage and weft direction of the fabric shrinkage measured by the method of the American Society for Testing and Materials ASTM D 1776 can be 1.0% or less, preferably 0.8% or less, respectively, Later, the fabric shrinkage in the warp direction and the weft direction may be 1.0% or less, preferably 0.8% or less, respectively. Here, in terms of the shape stability of the fabric, it is most preferable that the fabric shrinkage ratio in the warp direction and the weft direction do not exceed 1.0%.

As described above, the polyester fabric may maintain a toughness and tear strength of the fabric by using a polyester yarn having high strength and low modulus properties, and at the same time, significantly lower the stiffness of the fabric. The fabric for the air bag may exhibit a degree of stiffness of 2.0 kgf or less or 0.3 to 2.0 kgf according to the American Society for Testing and Materials Standard ASTM D 4032 method. As such, the stiffness of the fabric is significantly lowered than that of the conventional polyester fabric. Thus, the fabric for the airbag of the present invention may exhibit excellent folding and flexibility, and improved storage performance when the airbag is mounted. As such, the stiffness of the fabric is significantly lowered than that of the conventional polyester fabric. Thus, the fabric for the airbag of the present invention may exhibit excellent folding and flexibility, and improved storage performance when the airbag is mounted.

In order to use the fabric of the present invention, it is preferable to maintain the above-mentioned stiffness range, and if the stiffness is too low, it may not have sufficient protective support function when the airbag is inflated and deployed. This may degrade the storage. In addition, in order to prevent the stiffness from falling down due to being too hard to prevent folding and to reduce the discoloration phenomenon of the fabric, the stiffness is preferably 2.0 kgf or less, particularly in the case of less than 460 denier, 0.8 kgf or less, Even if it is 550 denier or more, it should be 2.0 kgf or less.

Static air permeability according to the American Society for Testing and Materials Test standard ASTM D 737 method of the polyester fabric is 10.0 cfm or less or 0.3 to 10.0 cfm, preferably 8.0 cfm or less or 0.3 when ΔP is 125 pa for an uncoated fabric. To cpm, more preferably 5.0 cfm or less, or 0.3 to 5.0 cfm, and when ΔP is 500 pa, 14 cfm or less or 4 to 14 cfm, preferably 12 cfm or less, or 4 to 12 cfm. Can be. In addition, the dynamic air permeability according to the American Society for Testing and Materials Standard ASTM D 6476 method is 1,700 mm / s or less, preferably 1,600 mm / s or 200 to 1,600 mm / s, more preferably 1,400 mm / s or 400 To 1,400 mm / s. In this case, the static air permeability refers to the amount of air that penetrates into the fabric when a certain pressure is applied to the fabric for the air bag, and the smaller the denier per filament of the yarn and the higher the density of the fabric, the lower the value. In addition, the dynamic air permeability refers to the degree of air permeation to the fabric when the average instantaneous differential pressure of 30 to 70 kPa is applied. May have

In particular, the air permeability of the polyester fabric can be significantly lowered by including a rubber component coating layer in the fabric, it is possible to ensure an air permeability of approximately 0 cfm. However, when the rubber component coating is performed as described above, the airbag coating fabric of the present invention has a static air permeability of 0.1 cfm or less from 0 to 0.1 cfm when △ P is 125 pa according to the American Society for Testing and Materials Standard ASTM D 737 method. Preferably, it may be 0.05 cfm or less or 0 to 0.05 cfm, and when ΔP is 500 pa, 0.3 cfm or less or 0 to 0.3 cfm, preferably 0.1 cfm or less or 0 to 0.1 cfm.

Here, the polyester fabric of the present invention for the non-coated fabric and the coated fabric, respectively, if the upper limit of the static air permeability range exceeds, or exceeds the upper limit of the dynamic air permeability range to maintain the airtightness of the fabric for the air bag In terms of aspect, this may not be desirable.

The polyester fabric may preferably further comprise a rubber component coating layer coated or laminated to the surface. The rubber component may include at least one selected from the group consisting of powder type silicone, liquid type silicone, polyurethane, chloroprene, neoprene rubber, and emulsion type silicone resin. Is not limited only to the above-mentioned materials. However, liquid silicone coating is preferable in terms of environmentally friendly and mechanical properties.

The coating amount per unit area of the rubber component coating layer may be used to 20 to 200 g / m ² , preferably 20 to 100 g / m ² . Particularly, in the case of OPW (One Piece Woven) type side curtain airbag fabric, the coating amount is preferably 30 g / m ² to 95 g / m ² , and in the case of plain weave fabric for air bag, the coating amount is 20 g / m ² to 50 g / m ² levels are preferred.

In addition, the polyester fabric of the present invention may have a scrub resistance of 600 times or 600 to 2,500 times according to the method of the International Organization for Standardization ISO 5981. In particular, when the fabric for the airbag does not have sufficient scrub resistance, when the airbag cushion is stored in the module in a high temperature climatic condition, the coating layer is severely peeled off when the airbag is deployed due to the actual car collision, and the high-pressure inflator compressed gas Situations may occur where the airbag cushion cannot withstand pressure. Preferably, the polyester fabric of the present invention can satisfy the excellent scrub resistance performance by applying a liquid silicone coating agent suitable for the polyester fabric for airbags rather than the conventional liquid silicone coating agent for nylon 66.

The liquid silicone coating agent that can be used in the polyester fabric of the present invention may further include an adhesion promoter and a crosslinking agent to enhance the adhesion between the polyester fabric and the silicone drug together with viscosity control of the base silicone polymer. In this case, the adhesion promoter may include about 0.2 to 8.0 parts by weight, preferably 0.5 to 7.5 parts by weight, based on 100 parts by weight of the total coating agent, and the cross-linking agent component is about 0.2 to 8.0 parts by weight, preferably 0.5 To 7.5 parts by weight. As the adhesion promoter, 1,3,5-tris (trimethoxysilylpropyl) isocyanate or 3-glycidoxypropyltrimethoxy silane may be used, and the crosslinking agent may have two or more reactive silicon hydride functional groups. Silicone crosslinkers can be used. In addition, the liquid silicone coating agent may have a viscosity of 30,000 to 350,000 mPa · s, preferably 35,000 to 330,000 mPa · s, measured at room temperature (25 ° C.).

In the case of the coating fabric as well as ensuring excellent storage and folding properties when applied as an airbag cushion, sufficient scrub resistance is required to withstand high friction and high friction inflator gas pressure of high-pressure when deploying the airbag cushion. In particular, if the coating agent layer is easily peeled off over time in a situation where the airbag cushion is mounted in a long-term storage state in a vehicle, serious fabric damage may occur when the airbag is developed, thereby preventing the safety of the passengers of the vehicle.

On the other hand, according to another embodiment of the invention, there is provided a polyester fabric made of a polyester yarn having a predetermined characteristic. Polyester yarns used in the polyester fabric for airbags should be maintained at a low fineness and high strength, so the fineness may be 300 to 700 deniers.

In particular, the present invention not only has a polyester yarn having a high strength, low elongation, high modulus, but also high strength, high elongation, low modulus, and maintains excellent properties without deteriorating physical properties even under high temperature conditions for a long time. In order to develop a polyester yarn, a separate end group blocker, an antioxidant, a hydrolysis inhibitor, and the like may be applied to the polyester polymer chip. As such, a polyester yarn further comprising a separate end group blocker, an antioxidant, and a hydrolysis inhibitor may be used. By applying these polyester yarns to airbag products (cushion / fabric), not only are they capable of absorbing hot-high pressure inflator deployment energy when the airbag cushion is deployed by a real car crash, but also in long-term high temperature climate conditions. Even if the airbag cushion is in a stored state, it is possible to provide a polyester fabric for an airbag having excellent shape stability and toughness without deterioration of material properties.

In the fabric of the present invention, yarns exhibiting improved intrinsic viscosity, i.e., 0.8 dl / g or more or 0.8 to 1.3 dl / g, may be used as compared to polyester yarns previously known. In order to maintain the excellent physical properties of the airbag fabric in the long-term high temperature heat treatment conditions, it is preferable to use a polyester yarn having an intrinsic viscosity in the above range.

The intrinsic viscosity of the yarn may be more than 0.8 dl / g, by increasing the molecular weight of the polyester polymer by a high intrinsic viscosity can produce a yarn for air bags that can exhibit high strength properties even under low stretching conditions, The use of such a yarn is preferred because it can satisfy the strength required in manufacturing the fabric for airbags. Otherwise, it is inevitably forced to express high strength properties under high stretching conditions. In this case, since the orientation of the fiber is increased, high modulus properties appear, so it is difficult to achieve excellent folding properties. Therefore, it is preferable to maintain the intrinsic viscosity of the yarn at 0.8 dl / g or more to enable low modulus expression by applying low stretching. In addition, when the yarn viscosity is 1.3 dl / g or more, the stretching tension at the time of stretching may increase, which may cause a process problem, so 1.3 dl / g or less is more preferable. In particular, the polyester yarn of the present invention maintains such a high degree of intrinsic viscosity, while providing low ductility with low stretching, and at the same time can provide sufficient mechanical properties, impact resistance, toughness, etc. to the fabric for the airbag Higher strength characteristics can be further imparted.

At the same time, in order to prevent degradation of physical properties such as tear strength and bark strength even after prolonged high temperature heat treatment, in order to prevent chain breakage of the main chain of polyester polymer due to high temperature long time heat treatment, unlike the conventional polyester polymer production method. Short-term blockers, hydrolysis inhibitors, antioxidants, and the like may further be included. At this time, the end group blocking agent, hydrolysis inhibitor, antioxidant and the like may be included in 0.1 to 2.0 parts by weight, preferably 0.3 to 1.7 parts by weight based on 100 parts by weight of the polyester polymer. For example, the polyester polymer is N, N′-nucleic acid-1,6-diylbis (3- (3,5-di-tert-butyl-), a phenolic amine-based antioxidant as a primary antioxidant. 4-hydroxyphenyl-propionamide) containing 200 to 1,500 ppm of N, N'-trimethylenebis- (3-3,5-di-t-butyl-4-hydroxyphenyl) as a secondary antioxidant Propionamide) at 0.2-1.0 wt%. In addition, the hydrolysis inhibitor may contain 0.1 to 0.7 wt% of carbodiimide-based hydrolysis inhibitor. As the end group sewing chain, one or more types may be used among the compounds represented by the following Formula 1, and may be used in 0.5 to 5 equivalents based on the hydroxyl equivalent of the crosslinking agent.

[Formula 1]

In formula, X is hydrogen, a C1-C6 aliphatic hydrocarbon radical, an alkoxy group, an aryloxy group, or a halogen element.

The polyester yarn is 60 to 115 g / de at a point where the Young's modulus of yarn measured by the method of ASTM D 885 standard at room temperature is 1% elongated, that is, 1% elongated, preferably 75 to 105 g / de, and may be 50 to 90 g / de, preferably 55 to 88 g / de at 2% elongation, ie 2% elongation. However, in the case of conventional general industrial polyester yarn, Young's modulus at 1% stretched point measured at room temperature is 115 g / de or more, and modulus at 2% stretched point is 90 g / de or more. By having a value, it can be seen that the polyester yarn of the present invention has a significantly lower modulus than conventional polyester industrial yarns.

In this case, the modulus of the polyester yarn is a physical property value of the elastic modulus obtained from the slope of the elastic section of the stress-strain diagram obtained in the tensile test, and when the object is stretched from both sides, the elastic modulus indicating the degree of stretching and deformation of the object The value corresponds to If the modulus of the fiber is high, the elasticity is good, but the stiffness of the fabric may be deteriorated. If the modulus is too low, the stiffness of the fabric is good, but the elasticity of the fabric may be low, and thus the toughness of the fabric may be deteriorated. As such, airbag fabrics made from polyester yarns having a lower initial modulus than conventional ones at room temperature as well as after heat treatment solve high stiffness problems of conventional polyester fabrics, and have excellent folding properties, Flexibility and storage capacity can be exhibited.

Toughness of the polyester yarn (Toughness) can be measured using a polyester yarn in place of the polyester fabric in the formula 5, the toughness of the yarn measured at room temperature may be 60 to 130 J / ㎥. In particular, in the present invention, by using a specific polyester yarn that meets a high level of toughness (toughness) compared to the conventional polyester yarn, for airbags that can effectively absorb and withstand the energy of hot-high pressure gas Fabric may be provided.

Therefore, it is possible to manufacture a fabric for an airbag which simultaneously exhibits excellent mechanical properties and storage properties, form stability, impact resistance, and air barrier effect by using a polyester yarn exhibiting such low initial modulus and high elongation, preferably high intrinsic viscosity. Become. Therefore, the polyester fabric of the present invention is made of a fabric for an air bag using the polyester yarn, showing a lower ductility and folding properties, flexibility, storage properties, but also excellent impact resistance, form stability, mechanical properties, airtightness Can be. These polyester fabrics provide excellent mechanical properties, shape stability, and air barrier effects, but also provide excellent folding and storage properties when mounted in tight spaces of cars, while providing excellent flexibility to minimize the impact on passengers to protect passengers. Since it can be, it can be preferably applied as a fabric for airbags.

In addition, the polyester yarn, it is preferable that the shrinkage stress in the temperature range of 150 ℃ to 200 ℃ corresponding to the coating temperature of the general coating fabric of the yarn is 0.005 to 0.075 g / d. That is, the shrinkage stress at 150 ° C. and 200 ° C. should be 0.005 g / d or more, respectively, to prevent sagging of the fabric due to heat during the coating process, and should be 0.075 g / d or less to be cooled at room temperature after the coating process. Relaxation stress can be alleviated. The shrinkage stress is based on values measured under a fixed load of 0.10 g / d.

In particular, the polyester yarn has a dry heat shrinkage measured at room temperature of at least 1.0% or 1.0% to 10%, preferably at least 1.5% or 1.5% to 8.0%, more preferably at least 2.0% or 2.0% to 6.0% Can be represented. In this way, by maintaining the dry heat shrinkage ratio of polyester yarn in the optimum range, it has high strength and high modulus, low modulus characteristics to secure excellent strength and flexibility, and excellent shrinkage characteristics to effectively control the air permeability of the fabric and mechanical properties such as desorption resistance Physical properties can be improved.

In order to prevent deformation in the heat treatment process such as coating as described above, the polyester yarn is also 40% to 55% crystallinity, preferably 41% to 52%, more preferably 41% to 50% Can be. The degree of crystallinity of the yarn should be more than 40% to maintain thermal morphological stability when applied to the fabric for airbags, and when the crystallinity exceeds 55%, there is a problem that the impact absorption performance is deteriorated because the amorphous region is reduced It is preferable to become 55% or less.

In addition, the polyester yarn may have a tensile strength of 8.5 g / d to 11.0 g / d at room temperature, preferably 8.7 g / d to 10 g / d, preferably 9.0 g / d to 9.8 g / d, and elongation at break may be between 15% and 30%, preferably between 16% and 26%, more preferably between 17% and 25%.

It is preferable that the said polyester yarn is a polyethylene terephthalate (PET) yarn among normal polyester, More preferably, it is a PET yarn containing 90 mol% or more of PET. In particular, the fabric of the present invention may be used a polyester polymer made of a polyester polymer having an intrinsic viscosity of at least 1.05 dl / g or 1.05 to 2.0 dl / g, that is, a PET chip. In order for the airbag fabric to maintain excellent physical properties even after a high temperature heat treatment at room temperature and a long period of time, it is preferable that the polyester yarn is made of a polyester polymer having an intrinsic viscosity of 1.05 dl / g or more. In addition, in order to ensure the thermal stability of the polymer during yarn production and to minimize the increase in the content of carboxyl end groups due to the molecular chain cleavage, it is made of a polyester polymer having an intrinsic viscosity of 2.0 dl / g or less, In order to prevent the chain cleavage phenomenon of the ester polymer backbone, it may include a polyester yarn containing an end group blocker, a hydrolysis inhibitor, an antioxidant, and the like.

At this time, the polyester yarn is manufactured using a high viscosity PET polymer having a low carboxyl end group (CEG, Carboxyl End Group) content, preferably 30 meq / kg or less, having a high strength and high elongation characteristics Can be.

In addition, the polyester yarn may be a single yarn fineness of 2.5 to 6.8 DPF. The single yarn fineness of the yarn is preferably 2.5 DPF or more in terms of weaving performance and yarn manufacturing (spinning) performance of the fabric for airbags, and 6.8 DPF or less in terms of air barrier properties and storage properties of the fabric for airbags. The more filaments of the yarn may give a soft touch, but if too many may have poor radioactivity, the number of filaments may be 96 to 160.

As already described above, the polyester fabric of the present invention can exhibit excellent performance in manufacturing the fabric for airbags by using a polyester yarn having an intrinsic viscosity, heat resistance, initial modulus and elongation range in the optimum range.

The polyester yarn used in fabrication of the present invention may be manufactured by a method in which a process of preparing undrawn yarn by melt spinning PET polymer and a process of drawing the undrawn yarn are connected in one process. In the yarn manufacturing process, the specific conditions or the progress method of each step is directly or indirectly reflected in the physical properties of the polyester yarn can be produced a polyester yarn that can be effectively used in the fabric for the air bag of the present invention.

 In particular, in a more preferred embodiment, the high strength, high elongation, low modulus polyester yarn of 270 to 320 ℃ using a high viscosity polymer containing at least 90 mol% polyethylene terephthalate and intrinsic viscosity of at least 1.05 dl / g Melt spinning at low temperature to prepare a polyester non-drawn yarn, and the polyester non-drawn yarn may be prepared by a method comprising the step of stretching under the draw ratio conditions of 4.8 to 6.7. At this time, the intrinsic viscosity of the yarn by melt spinning under low temperature conditions, more preferably low temperature / low speed conditions using a high viscosity PET polymer having a low carboxyl end group (CEG) content, preferably 30 meq / kg or less It is possible to suppress the degradation and increase the CEG content to the maximum, and to maintain high elongation characteristics while maintaining excellent mechanical properties of the yarn. Furthermore, by performing the drawing under the optimized drawing ratio conditions of 4.8 to 6.7 in the subsequent drawing process, to reduce the elongation of the yarn as much as possible to prepare a polyester yarn having a high strength and high elongation low modulus effectively applied to airbag fabric can do.

In this case, when the melt spinning process is performed at a high temperature, for example, when it is performed above 320 ° C., thermal decomposition of the PET polymer may occur in a large amount, which may lower the intrinsic viscosity and increase the CEG content. In addition, an increase in intramolecular orientation at high temperature may cause a decrease in elongation and increase in modulus, and may cause a decrease in overall physical properties due to surface damage of the yarn, which is not preferable. In addition, when the drawing process is carried out under too high draw ratios, for example, draw ratios exceeding 6.7, the drawing yarn may be over-stretched, resulting in cutting or moor in the drawn yarns. It is difficult to exhibit desirable physical properties for use as an airbag fabric. In addition, when the stretching process is performed under a relatively low draw ratio, the fiber orientation is low, and thus the strength of the polyester yarn manufactured therefrom may be partially lowered. Preferably, the stretching process is performed under a draw ratio of 4.8 or more to be applied to fabrics for airbags. It is possible to produce polyester yarns of high strength, high elongation, low modulus, which are suitable for.

On the other hand, in terms of manufacturing a polyester yarn which is a high strength and a low modulus high elongation under such high draw ratio conditions, it can be carried out by adjusting the conditions, such as relaxation rate of the subsequent process in an appropriate range. At this time, the relaxation rate may be 16% or less or 1% to 16%, preferably 10% or less or 1% to 10%, more preferably 7% or less or 1.1% to 7%. have. The lower limit of the relaxation rate may be selected in a range that allows sufficient yarn shrinkage to be expressed, for example, 1% or more. In some cases, if the relaxation rate is too small, for example, less than 1%, it may be difficult to produce high elongation low modulus fibers as high fiber orientation is formed as well under high draw ratio conditions. In addition, when the relaxation rate is more than 16%, it may be difficult to secure workability due to severe noise on a high pressure roller.

Through such process optimization, it is possible to secure a polyester yarn for airbags having a high initial strength and low elongation and high elongation. In addition, through optimization of the melt spinning and stretching process, it is possible to minimize the carboxyl end groups (CEGs), which exist as acids under high humidity conditions and cause basic molecular chain cleavage of polyester yarns. Therefore, such a polyester yarn exhibits a low initial modulus and a high elongation range at the same time, and thus can be preferably applied to an airbag fabric having excellent mechanical properties and storage properties, shape stability, toughness, impact resistance, and air barrier effect.

On the other hand, according to another embodiment of the invention, there is provided a method for producing a fabric for airbags using a polyester yarn. The manufacturing method of the fabric for airbags according to the present invention comprises the steps of weaving the dough for airbags using polyester yarns having a fineness of 300 to 700 deniers, refining the woven fabric for airbags, and heat-setting the refined fabric It may include a step.

In the present invention, the polyester yarn may be produced as a final airbag fabric through a conventional weaving method, refining and tentering process. At this time, the woven form of the fabric is not limited to a specific form, both the plain type and OPW (One Piece Woven) type of woven form is preferred.

In particular, the fabric for the airbag of the present invention can be produced through a beaming, weaving, refining, and heat setting process using the polyester yarn as a weft and warp yarn. The fabric can be produced using a conventional weaving machine, and is not limited to using any particular loom. However, plain weave fabrics can be manufactured using rapier looms, air jet looms, or water jet looms. OPW fabrics are Jacquard looms. Loom).

However, the present invention, by using a polyester yarn having a high shrinkage of high strength and high elongation compared to the conventional polyester yarn, it is possible to perform a heat treatment process at a higher temperature than conventional. In other words, in the present invention, the woven dough is subjected to a process of refining and heat-setting, which exhibits excellent physical properties as a fabric for airbags and over-pins the pin-type facility during the heat-setting process in order to maintain the properties of the fabric even after prolonged high temperature heat treatment. It is also preferable to maintain the feed OF at a level of 2 to 5% and to treat the heat setting process about two to three times in a row. After coating the heat-set fabric with a rubber component and drying, the vulcanization temperature is hardened at 140 to 210 ° C. The vulcanization temperature should be at least 140 ° C. in terms of maintaining mechanical properties such as tear strength of the fabric. It should be less than 210 ℃ in the side view. In particular, in order to maintain excellent physical properties even after long-term high temperature heat treatment, the heat treatment process may be performed in multiple steps. For example, after performing the first heat treatment process at 150 to 170 ° C., the second heat treatment process may be performed at 170 to 190 ° C. After performing, a third heat treatment process may be performed at 190 to 210 ° C.

As such, when the polyester fabric of the present invention is manufactured through a high-temperature heat treatment process, the optimized shrinkage characteristics of the polyester yarn itself can give a greater effect on morphological stability, air barrier, ductility, and tear strength. Can be.

In addition, the curing time at the vulcanization temperature may be carried out in the range of 30 to 120 seconds, preferably 35 to 100 seconds, and most preferably 40 to 90 seconds. In this case, when the curing time is less than 30 seconds, there is a problem that the hardening of the coating layer by the rubber component is not effectively performed and the mechanical properties of the fabric are lowered, so that the coating is peeled off. When the curing time exceeds 120 seconds, Due to the increase in the stiffness and thickness of the final fabric is produced a problem of poor folding properties.

The airbag fabric of the present invention can be coated on the one or both sides of the fabric by the rubber component as described above, the coating layer of the rubber component can be applied by knife coating method, doctor blade method, or spray coating method. However, this too is not limited to the above-mentioned method.

The coated airbag fabric may be manufactured in the form of an airbag cushion having a predetermined shape while cutting and sewing. The airbag is not limited to a particular form and may be manufactured in a general form.

On the other hand, according to another embodiment of the invention, there is provided a vehicle airbag comprising the polyester fabric described above. In addition, there is provided an airbag system comprising the above airbag, which may be provided with conventional devices well known to those skilled in the art.

The airbag may be largely classified into a frontal airbag and a side curtain airbag. The frontal airbag includes a driver's seat, a passenger seat, a side protection, a knee protection, ankle protection, a pedestrian protection airbag, and the side curtain type airbag protects passengers in a vehicle collision or rollover accident. Accordingly, the airbag of the present invention includes both a frontal airbag and a side curtain airbag.

In the present invention, matters other than those described above can be added or subtracted as required, and therefore, the present invention is not particularly limited thereto.

According to the present invention, there is provided a polyester fabric having excellent energy absorption performance in airbag deployment and a vehicle airbag obtained using the same.

This polyester fabric uses low modulus, high strength and high elongation of polyester yarn to minimize heat shrinkage even through high temperature heat treatment process, and at the same time obtain excellent form stability, mechanical properties, and air barrier effect. Excellent folding and flexibility can be secured, which significantly improves the storage performance of the vehicle and at the same time minimizes the impact on the passengers to protect the occupants. In particular, by manufacturing fabrics and cushions for airbags that have excellent levels of tear strength and bark strength even after prolonged high temperature heat treatment, airbags that have been stored for a long time under severe high temperature conditions are cushioned due to car crash. Even when this is deployed, it will have an excellent advantage in protecting passengers safely.

Therefore, the polyester fabric of the present invention can be very preferably used for the production of vehicle airbags and the like.

Figure 1 shows an example of the strength-elongation curve of a general fiber, the area of this elongation curve can be defined as toughness (breaking days, J / ㎥).
2 is a schematic diagram showing a scrub resistance measuring apparatus according to the International Organization for Standardization ISO 5981.
3 is a schematic diagram showing a tear strength measuring apparatus and a measuring method according to the fabric specification E668992 test standard for Autoliv airbag.
Figure 4 is a schematic diagram showing the measuring device and measuring method of the bark strength according to the fabric specification E668992 test standard for Autoliv (airliv) airbag.
5 is a graph showing the tear strength in the warp direction and the weft direction of the polyester fabric according to Example 5 before and after aging (at room temperature, 25 ° C.) and after heat aging at 110 ° C. for 3,000 hours.
FIG. 6 is a graph showing the bark strength in the warp direction and the weft direction of the polyester fabric according to Example 5 before and after aging (at room temperature, 25 ° C.) and after heat aging at 110 ° C. for 3,000 hours.
7 is a graph showing the tear strength in the warp direction and the weft direction of the polyester fabric according to Comparative Example 5 of the present invention, measured before heat aging (at room temperature, 25 ° C.) and after heat aging at 110 ° C. for 3,000 hours.
8 is a graph showing the bark strength in the warp direction and the weft direction of the polyester fabric according to Comparative Example 5 of the present invention, measured before heat aging (at room temperature, 25 ° C.) and after heat aging at 110 ° C. for 3,000 hours.

Hereinafter, the present invention will be described in more detail with reference to the following examples. However, the scope of the present invention is not limited to the following examples.

Example  1-5

After producing a polyester yarn with a PET chip having an inherent viscosity of 1.23 to 1.78 dl / g through a melt spinning machine in one step under conditions of a spinning temperature of 303 to 310 ° C. and an elongation ratio of 6.09, a rapier weaving machine was used. Weaving fabric dough for airbags through. After refining the fabric dough, OF gives about 3.8% and proceeds the heat treatment process twice in a row to manufacture the fabric for the airbag, using a silicone coating agent based on liquid silicone rubber (LSR) resin on the fabric, knife The coating (knife over ro1l coating) method to produce a silicone coated fabric.

The liquid silicone coating agent has a viscosity of 48,000 mPa · s measured at room temperature (25 ° C.) and is 1,3,5- as an adhesion promoter with respect to 100 parts by weight of the total weight of the coating agent together with the silicone rubber (LSR) resin. It comprises 0.65 wt% of tris (trimethoxysilylpropyl) isocyanate and 0.55 wt% of a silicone crosslinking agent having two or more reactive silicon hydride functional groups as a crosslinking agent.

At this time, the physical properties of modulus, tensile strength, elongation at break, dry heat shrinkage at the intrinsic viscosity, toughness, elongation of 1% and 2% of polyester yarn are as shown in Table 1 below, and the physical properties of the yarn at room temperature (25 ℃) x 65% RH).

In addition, the warp and weft density of the fabric, weaving form, heat treatment temperature, rubber components, resin coating amount is as shown in Table 1, the remaining conditions were in accordance with the conventional conditions for the production of polyester fabric for airbags.

division Example 1 Example 2 Example 3 Example 4 Example 5 PET content (mol%) 100 100 100 100 100 Intrinsic Viscosity of Yarn (dl / g) 0.99 1.02 1.03 1.02 1.03 Toughness of yarn
(Toughness, J / ㎥) 103 106 110 108 111 Modulus of yarn
(At elongation 1%, g / de) 98 98 97 95 94 Modulus of yarn
(At elongation 2%, g / de) 78 76 75 76 74 Tensile Strength of Yarn (g / de) 9.11 9.21 9.26 9.33 9.37 Cutting Elongation of Yarn (%) 17.4 17.7 18.3 18.4 18.6 Single Sand Island (DPF) 4.17 3.85 3.47 4.69 4.24 Total fineness (de) 500 500 500 620 620 Filament number 120 130 144 130 144 Weaving Density (Inclined X Weft) 46 x 46 46 x 46 46 x 46 43 x 43 43 x 43 Weaving Form Plain weave Plain weave Plain weave Plain weave Plain weave Heat treatment / vulcanization temperature (℃) 165-185 165-190 170-190 170-195 170-195 Rubber ingredient Liquid silicone Liquid silicone Liquid silicone Liquid silicone Liquid silicone Rubber coating amount (g / m ² ) 25 25 25 25 25

For the polyester fabrics prepared according to Examples 1 to 5, the tear strength retention index (PTSRI) and the bark strength retention index (PSSRI: Polyester Seam Strength Retention Index) were as follows. Measured, the measured physical property values are shown in Table 2 below.

(a) tear strength retention index

Tear strengths (PTS ^wa , PTS ^we , PTS ₃₀₀₀ ^wa , PTS ₃₀₀₀ ^we ) before and after heat treatment of the coated fabric were measured according to the fabric specification E668992 test specification for Autoliv airbags. The figure which shows the measuring apparatus and measuring method of the.

First, after cutting three specimens having a size of 70 mm x 250 mm, each of the upper and lower portions of the specimen is placed on the upper and lower bites of the device according to the test specification of the fabric specification E668992 for Autoliv airbags. Between the left and right spaces of the jaw face, i.e., A and B were positioned at the midpoint of the bite surface as shown in FIG. Thereafter, the spacing of the jaw face is based on 100 mm, respectively, in the opposite direction, ie with the upper bite device moving upwards and the lower material device moving downwards at 200 mm / min. The strength at which the fabric broke was measured.

Meanwhile, the measured inclination tear strength (PTS ^wa ) and the weft direction tear strength (PTS ^we ) at room temperature and the inclined tear strength (PTS ₃₀₀₀ ^wa ) of the fabric heat-treated at 110 ° C. for 3,000 hours. And using the weft direction tear strength (PTS ₃₀₀₀ ^we ) value, the inclination direction tear strength retention index (PTSRI ^wa ) of the fabric as shown in the following formula 1 and the weft direction tear strength as shown in the formula 2 below The maintenance index (PTSRI ^we ) was estimated.

[Equation 1]

PTSRI ^wa = PTS ₃₀₀₀ ^wa / PTS ^wa

[Equation 2]

PTSRI ^we = PTS ₃₀₀₀ ^we / PTS ^we

(b) Bark Strength Retention Index

Autoliv airbag fabric specification E668992 According to the test standard, the bark strength before and after heat treatment of the coated fabric was measured, Figure 4 is a view showing the measuring device and measuring method of such bark strength.

First, three specimens having a size of 100 mm x 170 mm were cut, and then cut into exactly 1/2 size so that the longitudinal length of each specimen was 85 mm, and then the two specimens cut to 1/2 size were combined. In addition, sewing was performed at a point where the longitudinal length of the combined specimens was 15 mm, that is, at a stitch number of 30 to 50ea / 100 mm using nylon 66 sewing thread (840D to 1260D) at points C and D of FIG. 4. Both sides of the finished specimen were placed between the upper and lower jaw faces in a device according to Fabric Spec E668992 Test Specification for Autoliv Airbags. Thereafter, the jaw face spacing is based on 76.2 mm, respectively, in the opposite direction, i.e. with the upper bite device moving upwards and the lower material device moving downwards at 200 mm / min. The strength at which the fabric broke was measured.

Meanwhile, the measured warp direction bark strength (PSS ^wa ) and weft direction bark strength (PSS ^we ) at room temperature and the warp direction bark strength (PSS ₃₀₀₀ ^wa ) and weft direction of the fabric heat-treated at 110 ° C. for 3,000 hours. Using the bark strength PSS ₃₀₀₀ ^we ) value, the inclined bark strength maintenance index (PSSRI ^wa ) of the fabric as shown in Equation 3 below and the weft direction bargain strength maintenance index (PSSRI ^we ) as shown in Equation 4 below are calculated. It was.

[Equation 3]

PSSRI ^wa = PSS ₃₀₀₀ ^wa / PSS ^wa

[Equation 4]

PSSRI ^we = PSS ₃₀₀₀ ^we / PSS ^we

division Example 1 Example 2 Example 3 Example 4 Example 5 PTS ^wa (kgf) 40.2 40.5 41.0 64.3 65.5 PTS ₃₀₀₀ ^wa (kgf) 40.2 39.7 42.3 62.4 67.5 PTSRI ^wa 1.00 0.98 1.03 0.97 1.03 PTS ^we (kgf) 40.8 41.2 41.8 65.3 66.2 PTS ₃₀₀₀ ^we (kgf) 39.2 40.8 42.2 64.0 67.5 PTSRI ^we 0.96 0.99 1.01 0.98 1.03 PSS ^wa (N) 1027 1030 1035 1113 1120 PSS ₃₀₀₀ ^wa (N) 924 948 963 1013 1042 PSSRI ^wa 0.90 0.92 0.93 0.91 0.93 PSS ^we (N) 1020 1033 1035 1120 1125 PSS ₃₀₀₀ ^we (N) 908 961 973 1064 1091 PSSRI ^we 0.89 0.93 0.94 0.95 0.97

Meanwhile, for the polyester fabric according to Example 5, the tear strength and the bark strength of the warp direction and the weft direction were measured before heat aging (at room temperature, 25 ° C.) and after heat aging at 110 ° C. for 3,000 hours, respectively. 6 is shown.

5 and 6 are graphs showing the degree of tear strength in the warp and weft direction and the bark strength in the warp and weft direction of the fabric heat-treated at 110 ° C. for 3,000 hours according to Example 5 compared to room temperature. As shown in Figure 5 and 6, the polyester fabric of Example 5 shows excellent tear strength and bark strength even after 3,000 hours. This means that even if the airbag cushion is stored in the vehicle for a long time, the bursting of the cushion sewing portion and the tearing of the fabric do not occur when the airbag cushion is deployed due to the collision of the vehicle, thereby protecting the passengers safely due to the collision of the vehicle. There is a big meaning as a measure.

On the other hand, Figures 7 and 8 are graphs showing the degree of tear strength in the warp and weft direction and the bark strength in the warp and weft direction of the fabric heat-treated at 110 ° C for 3,000 hours according to Comparative Example 5 compared to room temperature. However, as shown in Figures 7 and 8, the polyester fabric of Comparative Example 5 has a large drop in physical properties as the heat treatment time is increased, the tear steel is only about 72% to 75% compared to room temperature at the time of the last 3,000 hours It can be seen that the value of the bark strength. Thus, when the airbag cushion using the polyester fabric of Comparative Example 5 is in the state of being stored in the vehicle for a long time, even if the airbag cushion is developed due to the collision of the car, it is easily torn by the hot-high pressure inflator gas and the sewing part is popped. This will result in a failure to protect the passengers safety.

As shown in Table 2, when there is no car crash, the airbag cushion module, which can be stored in the car for a long time under high temperature climatic conditions, can be used to determine the level of physical properties that can be maintained. The inclination tear strength retention index (PTSRI ^wa ) and the weft direction tear strength maintenance index (PTSRI ^we ) for the polyester fabrics of Examples 1 to 5 measured after the heat treatment (110 ° C. x 3,000 hours) were 0.97 to 1.03, respectively. And 0.96 ~ 1.03 showed excellent values, and the inclination direction strength retention index (PSSRI ^wa ) and weft direction strength retention index (PSSRI ^we ) of fabrics showed excellent values of 0.90 ~ 0.93 and 0.89 ~ 0.97, respectively. Able to know. Thus, according to the present invention, the polyester fabric using the high strength, high modulus low modulus yarn can show a very excellent performance in terms of protecting the safety of the passenger in the event of a car crash even in a long-term, high temperature when used as an airbag cushion.

In addition, for the polyester fabrics prepared according to Examples 1 to 5 were measured for a variety of fabric properties in the following method, the measured fabric properties are summarized in Table 3 below.

(c) tensile strength and tensile elongation

The polyester fabric cuts the coated and uncoated fabric specimens, fixes them to the lower clamp of the tensile strength measuring device according to the International Organization for Standardization ISO 13934-1, and moves the upper clamp upward to break the airbag fabric specimen. Tensile strength and elongation at time were measured.

(d) Toughness of the fabric

Toughness (J / m 3) values were calculated by the following equation (5).

[Equation 5]

In Formula 5,

F represents the load applied when the length of the polyester fabric increases by dl,

dl represents the length of the polyester fabric.

At this time, the toughness of the fabric was measured with an uncoated fabric before coating treatment.

(e) Deactivation resistance

Using the uncoated fabric before coating treatment, the deactivation resistance of the fabric was measured at room temperature (25 ° C.) and 90 ° C., respectively, by the method according to the American Society for Testing and Materials, ASTM D 6479.

(f) Cover factor (CF)

The cover factor value for the uncoated fabric was calculated by the following Equation 6.

[Equation 6]

Cover Factor (CF)

(g) Fabric shrinkage rate

Fabric shrinkage in the warp / weft direction was measured according to the American Society for Testing and Materials, ASTM D 1776. First, after cutting the specimen with an uncoated fabric before coating treatment, mark the length before shrinking in the warp and weft directions by 20 cm, and measure the contracted length of the specimen heat-treated in the chamber at 149 ° C. for 1 hour in the warp direction. And weaving shrinkage ratio {(length before contraction-length after contraction) / length before contraction x 100%} in the weft direction.

(h) lecture

The uncoated fabric before coating treatment was measured by the circular bend method using a ductility measuring apparatus according to the American Society for Testing and Materials Standard ASTM D 4032. In addition, the cantilever method may be applied as a method of measuring the stiffness, and the stiffness can be measured by measuring the bend length of the fabric using a cantilever measuring device, which is a test bench that is inclined at an angle to give a bend to the fabric.

(i) after

The thickness of the uncoated fabric before coating treatment was measured according to the American Society for Testing and Materials, ASTM D 1777.

(j) Scrub resistance

Scrub resistance of the fabric was evaluated using a scrub resistance measuring apparatus according to the International Organization for Standardization ISO 5981 as shown in FIG.

First, cut the specimen with a coated fabric and press the fabric specimen with a press in the scrub test apparatus, hold both sides of the fabric specimen and repeat the movement, and perform a scrub test, until the coating layer begins to peel off the fabric. The number of times was measured.

At this time, the scrub resistance measurement is measured by measuring the total number of reciprocating motions of the wearer under a pressure force of 10 N. If the coating layer does not peel off after every 50 strokes, it is "passed" and continues. If the reciprocating process is carried out, and the coating layer is peeled off, the reciprocating motion is stopped by "fail". The number of times when the coating layer was peeled off at this time was measured.

The case where the number of times of scrub resistance measured in this way was 600 or more was evaluated as "good", and the case where it was less than 600 was evaluated as "bad".

division Example 1 Example 2 Example 3 Example 4 Example 5 Fabric toughness
(Toughness, kJ / ㎥) 3.89 3.98 4.10 5.73 5.90 Bowness resistance of fabric (25 ℃) 480 492 495 620 625 Bowness resistance of fabric (90 ℃) 462 470 473 602 605 Fabric Cover Factor 2,057 2,057 2,057 2,141 2,141 Fabric Shrinkage
(%) slope 0.3 0.4 0.3 0.3 0.5 Weft 0.5 0.5 0.5 0.4 0.4 Lecture degree (kgf) 0.85 0.82 0.88 1.20 1.15 Thickness (mm) 289 288 288 332 332 Scrubs (times) 1,500 1,500 1,500 1,500 1,500 Scrub resistance evaluation Good Good Good Good Good

Comparative example  1-5

A polyester fabric for airbags of Comparative Examples 1 to 5 was prepared according to the same method as Examples 1 to 5 except for the conditions described in Table 4 below.

division Comparative Example 1 Comparative Example 2 Comparative Example 3 Comparative Example 4 Comparative Example 5 PET content (mol%) 100 100 100 100 100 Intrinsic Viscosity of Yarn (dl / g) 0.57 0.59 0.59 0.57 0.61 Toughness of yarn
(Toughness, J / ㎥) 53 55 57 58 60 Modulus of yarn
(At elongation 1%, g / de) 113 1113 114 122 125 Modulus of yarn
(At elongation 2%, g / de) 95 96 97 97 98 Tensile Strength of Yarn (g / de) 6.6 6.7 6.9 6.8 7.3 Cutting Elongation of Yarn (%) 11.4 12.2 13.4 13.7 14.2 Dry heat shrinkage (%) 14.9 13.1 11.0 11.4 11.3 Single Sand Island (DPF) 10.0 8.33 6.94 10.3 8.61 Total fineness (de) 500 500 500 620 620 Filament number 50 60 72 60 72 Weaving Density (Inclined X Weft) 46 x 46 46 x 46 46 x 46 43 x 43 43 x 43 Weaving Form Plain weave Plain weave Plain weave Plain weave Plain weave Heat treatment / vulcanization temperature (℃) 165 170 175 170 175 Rubber ingredient Liquid silicone Liquid silicone Liquid silicone Liquid silicone Liquid silicone Rubber coating amount (g / m ² ) 25 25 25 25 25

The tear strength retention index (PTSRI: Polyester Tearing Strength Retention Index) and the bark strength retention index (PSSRI: Polyester Seam Strength Retention Index) of the polyester fabrics prepared according to Comparative Examples 1 to 5 are shown in Table 5 below. same.

division Comparative Example 1 Comparative Example 2 Comparative Example 3 Comparative Example 4 Comparative Example 5 PTS ^wa (kgf) 18.4 18.6 18.8 21.8 22.3 PTS ₃₀₀₀ ^wa (kgf) 12.9 13.6 14.1 15.9 16.7 PTSRI ^wa 0.70 0.73 0.75 0.73 0.75 PTS ^we (kgf) 18.3 18.4 19.0 22.0 22.5 PTS ₃₀₀₀ ^we (kgf) 12.3 12.5 12.9 15.4 16.2 PTSRI ^we 0.67 0.68 0.68 0.70 0.72 PSS ^wa (N) 510 510 512 653 660 PSS ₃₀₀₀ ^wa (N) 347 347 358 470.2 495 PSSRI ^wa 0.68 0.68 0.70 0.72 0.75 PSS ^we (N) 499 503 507 657 652 PSS ₃₀₀₀ ^we (N) 329 342 349.8 479.6 489 PSSRI ^we 0.66 0.68 0.69 0.73 0.75

Meanwhile, for the polyester fabric according to Comparative Example 5, the tear strength and the bark strength of the warp direction and the weft direction were measured before heat aging (at room temperature, 25 ° C.) and after heat aging at 110 ° C. for 3,000 hours, respectively. 8 is shown.

As shown in Table 5, in the absence of an automobile crash, the airbag cushion module, which may be stored in the vehicle for a long time under high temperature climatic conditions, may be used to determine the actual level of physical properties of the airbag cushion module. The inclination tear strength retention index (PTSRI ^wa ) and the weft direction tear strength maintenance index (PTSRI ^we ) for the polyester fabrics of Comparative Examples 1 to 5 measured after heat treatment (50 ° C. x 3000 hours) were 0.70 to 0.75, respectively. And 0.67 ~ 0.72, and the inclination strength of bark strength retention index (PSSRI ^wa ) and weft direction of bark strength maintenance index (PSSRI ^we ) are 0.68 ~ 0.75 and 0.66 ~ 0.75, respectively, and the tear strength and bark strength level are sharply increased. You can see that it is falling. As a result, when the airbag cushion is stored in the automobile module for a long time in actual high temperature climatic conditions, even if the airbag cushion due to the actual car collision is deployed, there may be a problem that the safety of the automobile passengers may not be protected.

In addition, various fabric properties for the polyester fabrics prepared according to Comparative Examples 1 to 5 are summarized in Table 6 below.

division Comparative Example 1 Comparative Example 2 Comparative Example 3 Comparative Example 4 Comparative Example 5 Fabric toughness
(Toughness, kJ / ㎥) 2.3 2.5 2.5 2.5 2.7 Bowness resistance of fabric (25 ℃) 210 212 223 240 245 Bowness resistance of fabric (90 ℃) 190 193 195 220 235 Fabric Cover Factor 2,057 2,057 2,057 2,141 2,141 Fabric Shrinkage
(%) slope 1.4 1.3 1.3 1.2 1.2 Weft 1.2 1.1 1.0 1.0 1.1 Lecture degree (kgf) 1.87 1.87 1.87 2.6 2.6 Thickness (mm) 289 288 288 332 332 Scrubs (times) 50 50 50 50 50 Scrub resistance evaluation Bad Bad Bad Bad Bad

As shown in Tables 1 to 3, the polyester fabrics of Examples 1 to 5, in which the tear strength and the bark strength index were optimized using high modulus and low modulus polyester yarns according to the present invention, have a toughness of 3.89. To 5.90 kJ / m ³ , it showed excellent mechanical properties that can sufficiently withstand high-pressure high pressure inflator gas during airbag deployment. In addition, it can be seen that the fabric has very excellent characteristics of the shrinkage of the fabric in the warp direction and the weft direction of 0.3% to 0.5% and 0.3% to 0.5%, respectively. At the same time, it can be confirmed that the polyester fabrics of Examples 1 to 5 have an excellent optimum range of 0.65 to 1.20 kgf of stiffness, and thus have excellent foldability and storage properties with excellent form stability.

In particular, the polyester fabrics of Examples 1 to 5 using high-strength, low-modulus yarns, the cover factor of the fabric is 2,057 to 2,141, the sliding resistance value at 25 ℃ and 90 ℃, respectively 480 to 625 N and By showing a very good value of 462 to 605 N, it can be seen that the bark sliding phenomenon at the seam of the cushion seam is greatly improved when the airbag cushion is deployed, and the airtightness and energy absorption performance of the cushion can be further improved. have.

On the other hand, as shown in Tables 4 to 6, it was confirmed that the polyester fabrics of Comparative Examples 1 to 5 using low-viscosity general industrial polyester yarns did not meet these characteristics. In particular, it can be seen that the polyester fabrics of Comparative Examples 1 to 5 have toughness of 2.3 to 2.7 kJ / m ³ , and the shrinkage in the warp direction and the weft direction drop significantly to 1.2% to 1.4% and 1.0% to 1.2%, respectively. . When a fabric having a significantly lower mechanical property is used in the airbag device, a problem may occur due to a decrease in mechanical properties such as an airbag bursting when the airbag is deployed.

In addition, the fabrics of Comparative Examples 1 to 5 show a cover factor similar to that of the fabrics of Examples 1 to 5, but the sliding resistance values at 25 ° C. and 90 ° C. are 210 N to 245 N and 190 N to 235, respectively. It is remarkably dropped to N, and when the airbag cushion is deployed, a large amount of slippage occurs at the seam of the cushion outer seam, which may be a big problem for the safety of the customer.

Experimental Example  One

In Example 1 to 5 and Comparative Examples 1 to 5, the air bag cushion was manufactured by using a non-coated fabric and a polyester coated fabric, which were subjected to the coating process, together, as shown in Table 7 below. A vehicle airbag was manufactured from a driver airbag (DAB) cushion assembly and a passenger airbag (PAB) cushion assembly. The vehicle airbag thus completed was subjected to static deployment performance testing under three heat treatment conditions (at room temperature: 25 ° C x 4 hr oven left, Hot: 85 ° C x 4 hr oven left, Cold: -30 ° C x 4 hr oven left). static test).

As a result of performing the static development test, the fabric was evaluated as "Pass" when no tearing of the fabric, no pinholes, and no carbonization occurred, and the tearing of the fabrics and the pinholes of the sewing part were evaluated. When any one of the occurrence or the end carbonization occurred, it was evaluated as "Fail". Here, if the deployment test result is "Pass", it can be used as an airbag cushion, but "Fail" means that it cannot be used as an airbag cushion.

The static test results of the airbag cushion manufactured using the polyester uncoated fabrics of Examples 1 to 5 and Comparative Examples 1 to 5 are shown in Table 7 below.

division Cushion specifications Gunpowder
Inflator
Pressure (kPa) Gunpowder
Inflator
Temperature (℃) Room temperature
Development test
(Static) Hot
Development test
(Static) Cold
Development test
(Static) Example 1 DAB 215 475 Pass Pass Pass Example 2 DAB 215 475 Pass Pass Pass Example 3 DAB 215 475 Pass Pass Pass Example 4 PAB 315 600 Pass Pass Pass Example 5 PAB 315 600 Pass Pass Pass Comparative Example 1 DAB 215 475 Fail Fail Fail Comparative Example 2 DAB 215 475 Fail Fail Fail Comparative Example 3 DAB 215 475 Fail Fail Fail Comparative Example 4 PAB 315 600 Fail Fail Fail Comparative Example 5 PAB 315 600 Fail Fail Fail

Experimental Example  2

For airbag cushions manufactured using the polyester uncoated fabrics of Examples 1 to 5, which were evaluated as "Pass" in the static test of Experimental Example 1, further limit limit performance test (upper limit) test).

The upper limit test (upper limit test) was performed in the same manner as in Experimental Example 1 except that the cushion assembly specifications and inflator pressure were changed as shown in Table 8, and the evaluation result thereof Is as shown in Table 8 below.

division Cushion specifications Gunpowder
Inflator
pressure
(kPa) Gunpowder
Inflator
Temperature
(℃) Room temperature
Development test
(Upper Limit) Hot
Development test
(Upper Limit) Cold
Development test
(Upper Limit) Example 1 DAB 240 590 Pass Pass Pass Example 2 DAB 240 590 Pass Pass Pass Example 3 DAB 240 590 Pass Pass Pass Example 4 PAB 350 645 Pass Pass Pass Example 5 PAB 350 645 Pass Pass Pass

As shown in Table 7 and Table 8, in the vehicle airbag comprising the polyester fabric of Examples 1 to 5 by optimizing the tear strength and the bark strength range by using a polyester yarn of a specific fineness range according to the present invention After leaving the oven under three heat treatment temperature conditions, the static test and the upper limit test were carried out, respectively, resulting in fabric tearing and pinholes. It is understood that the original carbonization does not occur, and thus all have excellent performance as a vehicle airbag.

In this case, the static deployment test is the most basic deployment test in which an initial airbag cushion is designed and evaluated, and is evaluated only when the airbag cushion is mounted in a module state. The normal temperature that the inflator can produce And evaluation under development pressure. When the static deployment test is completed normally, the evaluation proceeding to the next step is the upper limit test. The upper limit test is performed at the highest temperature and development pressure that the inflator can deliver, and is actually performed at the most severe conditions (high temperature and high pressure). There are many cases where this is not satisfied. Finally, the static test and the upper limit test must be evaluated as "Pass" to be mass-produced as an airbag cushion.

On the other hand, in the static test results of the vehicle airbag including the polyester fabric of Comparative Examples 1 to 5, the tearing of the fabric during airbag deployment, the determination of the fabric by the friction of the fabric, the pinhole of the sewing portion Each cushion was evaluated as "Fail" due to fabric judgment due to the occurrence of) and fabric carbonization. Accordingly, it can be seen that the vehicle airbag including the polyester fabrics of Comparative Examples 1 to 5 cannot be used as an actual airbag before the upper limit test is evaluated. Particularly, in the development test of the DAB (driver airbag) cushion assembly including the fabrics of Comparative Examples 1, 2, and 3, fabric tearing occurred in the outer sewing portion and the tether portion of the cushion, and in Comparative Examples 4 and 5, In the inflator inlet part, the tearing of the fabric and the tearing of the fabric of the cushion front panel due to the fabric friction occurred.

In addition, in the static test of the vehicle airbag including the fabrics of Comparative Examples 1 to 5, the fabric tearing occurs because the physical properties of the polyester yarn and the fabric itself are very low. (pin hole) generation, lack of friction resistance, it can be confirmed that due to the occurrence of the carbonization due to the phenomenon. Therefore, the airbag fabric of Comparative Examples 1 to 5 may cause a great risk to the airbag function due to airbag rupture, etc. when applied to the actual airbag cushion for the vehicle. In addition, even under short heat treatment conditions of room temperature, high temperature, and low temperature, if a car collision accident occurs when a fabric that does not satisfy the performance as an airbag cushion is stored for a long time at a high temperature, passenger safety is not guaranteed at all. Can be.

Claims (14)

Includes a polyester yarn having a fineness of 300 to 700 denier,
The warp direction PTSRI ^wa index of the fabric as shown in the following formula 1 is 0.8 or more, the weft direction PTSRI ^we index of the fabric as shown in the following formula 2 is 0.8 or more, and the warp direction PSSRI of the fabric as shown in the following formula 3 A polyester fabric having a ^wa index of 0.8 or more and a weft direction PSSRI ^we index of a fabric as shown in Equation 4 below: 0.8 or more:
[Equation 1]
PTSRI ^wa = PTS ₃₀₀₀ ^wa / PTS ^wa
[Equation 2]
PTSRI ^we = PTS ₃₀₀₀ ^we / PTS ^we
[Calculation 3]
PSSRI ^wa = PSS ₃₀₀₀ ^wa / PSS ^wa
[Calculation 4]
PSSRI ^we = PSS ₃₀₀₀ ^we / PSS ^we
In the above formula,
PTSRI ^wa and PTSRI ^we were maintained at 110 ° C for 3,000 hours, and then the tear strength retention index (PTSRI: Polyester Tearing) was measured according to the fabric specification E668992 test specification for Autoliv airbags. Strength Retention Index)
The PSSRI ^wa and PSSRI ^we are maintained in the inclined and weft direction of the fabric seam strength (PSSRI: Polyester Seam Strength) measured according to the fabric specification E668992 test specification for Autoliv airbag after heat treatment at 110 ℃ for 3,000 hours. Retention Index)
PTS ^wa and PTS ^we are the tear strength (kgf) in the warp direction and weft direction of the fabric measured at room temperature according to the fabric specification E668992 test specification for Autoliv airbag, respectively.
PTS ₃₀₀₀ ^wa and PTS ₃₀₀₀ ^we are the tear strength (kgf) in the warp direction and weft direction of the fabric measured according to the fabric specification E668992 test specification for Autoliv airbag after heat treatment at 110 ° C for 3,000 hours, respectively.
PSS ^wa and PSS ^we are the bark strength (N) in the warp direction and weft direction of the fabric measured at room temperature according to the fabric specification E668992 test specification for Autoliv airbag, respectively.
PSS ₃₀₀₀ ^wa and PSS ₃₀₀₀ ^we are the inclination and weft strength (N) of the fabric measured according to the fabric specification E668992 test specification for Autoliv airbags after heat treatment at 110 ° C for 3,000 hours. The method of claim 1,
The tear strengths of the fabric PTS ^wa , PTS ^we , PTS ₃₀₀₀ ^wa , and PTS ₃₀₀₀ ^we are more than 25 kgf, the fleece strength of the fabric PSS ^wa , PSS ^we , PSS ₃₀₀₀ ^wa , and PSS ₃₀₀₀ ^we are more than 700 N Ester fabric. The method of claim 1,
Polyester fabric having a toughness of 3.2 kJ / m 3 or more, as defined by Formula 5 below:
[Calculation 5]

In the above formula, F represents the load applied when the length of the polyester fabric increases by dl. The method of claim 1,
Polyester fabric with a stiffness of 2.0 kgf or less according to ASTM D 4032 method. The method of claim 1,
Polyester fabric having a sliding resistance of 300 N or higher at room temperature and a sliding resistance of 280 N or higher measured at room temperature by the American Society for Testing and Materials Standard ASTM D 6479. The method of claim 1,
A polyester fabric comprising a polyester yarn having a tensile strength of 8.5 g / d to 11.0 g / d and an elongation at break of 15% to 30% measured at room temperature. The method of claim 1,
The Young's modulus measured at room temperature by the method of the American Society for Testing and Materials ASTM D 885 includes 60 to 110 g / de at 1% elongation and 50 to 87 g / de at 2% elongation. Polyester fabric. The method of claim 1,
A polyester fabric for an airbag having a cover factor of 1,800 to 2,460 as defined in Formula 6 below:
[Calculation 6]
Cover Factor (CF)

The method of claim 1,
A polyester fabric coated with at least one rubber component selected from the group consisting of powder type silicone, liquid type silicone, polyurethane, chloroprene, neoprene rubber, and emulsion type silicone resin. 10. The method of claim 9,
Polyester fabric having a coating amount of 20 to 200 g / m ² per unit area of the rubber component. Weaving the dough for airbags with a polyester yarn having a fineness of 300 to 700 denier,
Refining the dough for the woven airbag, and
Tentering the refined fabric
A method for producing a polyester fabric according to any one of claims 1 to 10, including. 12. The method of claim 11,
In the tentering step, the heat treatment temperature is 140 to 210 ℃ manufacturing method of the polyester fabric. A vehicle airbag comprising the polyester fabric according to any one of claims 1 to 10. The method of claim 13,
The airbag is a vehicle airbag is a frontal airbag or side curtain type airbag.

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