WO2024048153A1 - Tissu de coussin de sécurité gonflable - Google Patents

Tissu de coussin de sécurité gonflable Download PDF

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Publication number
WO2024048153A1
WO2024048153A1 PCT/JP2023/027639 JP2023027639W WO2024048153A1 WO 2024048153 A1 WO2024048153 A1 WO 2024048153A1 JP 2023027639 W JP2023027639 W JP 2023027639W WO 2024048153 A1 WO2024048153 A1 WO 2024048153A1
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Prior art keywords
fabric
airbag
less
polyamide
heat treatment
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PCT/JP2023/027639
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English (en)
Japanese (ja)
Inventor
悠太 菅沼
陽望 永瀬
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東レ株式会社
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Publication of WO2024048153A1 publication Critical patent/WO2024048153A1/fr

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60R—VEHICLES, VEHICLE FITTINGS, OR VEHICLE PARTS, NOT OTHERWISE PROVIDED FOR
    • B60R21/00—Arrangements or fittings on vehicles for protecting or preventing injuries to occupants or pedestrians in case of accidents or other traffic risks
    • B60R21/02—Occupant safety arrangements or fittings, e.g. crash pads
    • B60R21/16—Inflatable occupant restraints or confinements designed to inflate upon impact or impending impact, e.g. air bags
    • B60R21/23—Inflatable members
    • B60R21/235—Inflatable members characterised by their material
    • D—TEXTILES; PAPER
    • D01—NATURAL OR MAN-MADE THREADS OR FIBRES; SPINNING
    • D01F—CHEMICAL FEATURES IN THE MANUFACTURE OF ARTIFICIAL FILAMENTS, THREADS, FIBRES, BRISTLES OR RIBBONS; APPARATUS SPECIALLY ADAPTED FOR THE MANUFACTURE OF CARBON FILAMENTS
    • D01F6/00—Monocomponent artificial filaments or the like of synthetic polymers; Manufacture thereof
    • D01F6/58—Monocomponent artificial filaments or the like of synthetic polymers; Manufacture thereof from homopolycondensation products
    • D01F6/60—Monocomponent artificial filaments or the like of synthetic polymers; Manufacture thereof from homopolycondensation products from polyamides
    • D—TEXTILES; PAPER
    • D03—WEAVING
    • D03D—WOVEN FABRICS; METHODS OF WEAVING; LOOMS
    • D03D1/00—Woven fabrics designed to make specified articles
    • D03D1/02—Inflatable articles
    • D—TEXTILES; PAPER
    • D03—WEAVING
    • D03D—WOVEN FABRICS; METHODS OF WEAVING; LOOMS
    • D03D15/00—Woven fabrics characterised by the material, structure or properties of the fibres, filaments, yarns, threads or other warp or weft elements used
    • D03D15/20—Woven fabrics characterised by the material, structure or properties of the fibres, filaments, yarns, threads or other warp or weft elements used characterised by the material of the fibres or filaments constituting the yarns or threads
    • D03D15/283—Woven fabrics characterised by the material, structure or properties of the fibres, filaments, yarns, threads or other warp or weft elements used characterised by the material of the fibres or filaments constituting the yarns or threads synthetic polymer-based, e.g. polyamide or polyester fibres

Definitions

  • the present invention relates to textiles, particularly textiles for airbags.
  • Airbag devices for occupant safety are designed to protect occupants in the event of a vehicle collision by using a shock sensor to activate a gas generator (inflator) that momentarily inflates the airbag with gas. be.
  • gas generator inflator
  • airbags for frontal collisions such as the driver's and passenger's seats use inflators that generate high-temperature, high-pressure gas because they have a large impact on the interior design of the vehicle.
  • fabrics for airbags are required to have low air permeability and form stability.
  • an inflator when used, there are cases in which hot air is concentrated from the holes in the airbag's seams, creating a problem of joints.
  • Airbag devices are installed in vehicles and are exposed to various environments for long periods of time, particularly in high temperature and high humidity environments during the summer and rainy seasons. Therefore, for airbags to deploy smoothly and safely, it is necessary to minimize changes in physical properties and shape even under harsh environmental conditions.
  • Patent Document 1 discloses a fabric for airbags that suppresses instantaneous thermal deformation of an inflator and improves its resistance to slippage by going through a refining/shrinking process and a drying process.
  • Patent Document 2 discloses a long-term stable airbag base fabric using low boiling yield nylon 66 fibers with a cyclic unimer component ratio within a specific range.
  • Patent Document 3 describes that the base fabric for an airbag uses polyethylene terephthalate as a raw material to suppress moisture content and suppress deformation after a moist heat deterioration cycle.
  • the airbag described in Patent Document 1 tends to change its physical properties after being placed in a harsh environment for a long time.
  • the airbag described in Patent Document 2 does not solve the problem of physical property change assuming hydrolysis of nylon 66 under high temperature and high humidity conditions.
  • the airbag base fabric described in Patent Document 3 has inferior deployment performance compared to nylon 66.
  • the polyethylene terephthalate used is more reactive than polyamide. Therefore, polyethylene terephthalate is more easily hydrolyzed than polyamide under long-term high temperature and humid conditions.
  • the object of the present invention is to provide a fabric for airbags with high environmental reliability, which has improved shape stability and anti-slip properties under high temperature and high humidity conditions, and maintains mechanical properties and breathability as an airbag.
  • the goal is to provide the following.
  • a fabric for an airbag according to one aspect of the present invention that solves the above problems is made of polyamide fiber, and has a moisture content of more than 0.5% and less than or equal to 2.5% as measured in accordance with JIS L1096:2010 8.10.
  • the airbag fabric has a shrinkage rate of 2.40% or less in the warp direction and 0.90% or less in the weft direction after moist heat treatment, and a slip resistance retention rate of 96.0% or more after moist heat treatment.
  • the airbag fabric of one embodiment of the present invention is made of polyamide fibers.
  • the moisture content of the fabric measured according to JIS L1096:2010 8.10 is more than 0.5% and less than 2.5%.
  • the shrinkage rate after the moist heat treatment is 2.40% or less in the warp direction and 0.90% or less in the weft direction.
  • the slip resistance retention rate after moist heat treatment is 96.0% or more.
  • the moisture content of the airbag fabric of this embodiment is preferably greater than 0.5%, and preferably greater than 0.6%. Further, the moisture content is 2.5% or less, preferably 2.4% or less. When the moisture content exceeds 0.5%, heat resistance is less likely to be impaired. On the other hand, since the moisture content is 2.5% or less, the airbag fabric is difficult to deteriorate even in a humid heat environment. It is assumed that a polyamide with a small proportion of amide groups in the polymer chain has a moisture content within the above range, and therefore, polyamide 410 is preferable as the polyamide constituting the polyamide fiber, considering the proportion of amide groups in the polymer chain.
  • the shrinkage rate of the airbag fabric of this embodiment after 408 hours of moist heat treatment under conditions of a temperature of 70°C and a humidity of 95% RH is preferably 2.40% or less in the warp direction and 0.90% or less in the weft direction. is 2.3% or less in the longitudinal direction and 0.85% or less in the latitudinal direction, more preferably 2.2% or less in the longitudinal direction and 0.80% or less in the latitudinal direction.
  • the shrinkage rate of the airbag fabric after moist heat treatment is 2.40% or less in the warp direction and 0.90% or less in the weft direction, so that the dimensions of the airbag fabric due to environmental changes over time when the airbag is stored are Changes are small and can be expanded correctly.
  • the moist heat treatment conditions are conditions in which the sample is left exposed in a moist heat oven at a temperature of 70° C. and a humidity of 95% RH for 408 hours.
  • polyamide 410 is preferable as the polyamide.
  • the dry heat shrinkage rate of the airbag fabric of the present embodiment is preferably 1.40% or less in the warp direction and 0.80% or less in the weft direction, more preferably 1.38% or less in the warp direction and 0.8% in the weft direction. It is 77% or less, more preferably 1.35% or less in the longitudinal direction and 0.75% or less in the latitudinal direction.
  • the shrinkage rate of the airbag fabric after moist heat treatment is 1.40% or less in the warp direction and 0.80% or less in the weft direction, so that the dimensional change due to hot air during airbag deployment is small and the airbag can be deployed correctly.
  • the airbag fabric of the present embodiment has an average sliding resistance retention rate of 96.0% or more in the weft and warp direction after 408 hours of moist heat treatment under conditions of a temperature of 70°C and a humidity of 95% RH, and preferably 97% or more. and more preferably 98% or more.
  • the upper limit of the average slip resistance retention rate is usually 150% or less.
  • the slip resistance after moist heat treatment may exceed that before moist heat treatment. A large increase in slip resistance impairs deployment performance.
  • As the moist heat treatment conditions conditions may be adopted in which the product is left exposed in a moist heat oven at a temperature of 70° C. and a humidity of 95% RH for 408 hours.
  • the airbag fabric of the present embodiment preferably has a tensile strength retention rate of 97.0% or more, preferably 97.5% or more after moist heat treatment for 408 hours at a temperature of 70° C. and a humidity of 95% RH. More preferably, it is 98.0% or more. Since the tensile strength retention rate after the moist heat treatment is 97.0% or more, the resulting airbag has high reliability under a moist heat environment. It is presumed that because the moisture content is within the above range, the deterioration (hydrolysis) of the polymer in the airbag fabric is suppressed and the decrease in tensile strength is suppressed.
  • the moist heat treatment conditions conditions may be adopted in which the product is left exposed in a moist heat oven at a temperature of 70° C. and a humidity of 95% RH for 408 hours.
  • the airbag fabric of this embodiment has a dynamic air permeability increase rate of 15% or less, preferably 14% or less, after 408 hours of moist heat treatment under conditions of a temperature of 70° C. and a humidity of 95% RH. More preferably, it is 13% or less.
  • the dynamic air permeability increase rate is 15% or less, the resulting airbag has excellent reliability under a humid heat environment. Furthermore, it is presumed that because the moisture content is more than 0.5% and less than 2.5%, the airbag fabric is able to suppress deterioration (hydrolysis) of the polymer and suppress an increase in air permeability.
  • the moist heat treatment conditions may be such that the sample is left exposed in a moist heat oven at a temperature of 70° C. and a humidity of 95% RH for 408 hours.
  • polyamide 410 is preferable among polyamides because it has a moisture content that suppresses polymer deterioration.
  • the tensile strength of the decomposed yarn of the woven fabric is preferably 5.9 N or more, more preferably 6.0 or more, and even more preferably 6.1 or more. Further, the tensile strength of the decomposed yarn of the textile is preferably 7.8N or less, more preferably 7.7N or less, and even more preferably 7.6N or less. If the tensile strength of the textile decomposed yarn is 5.9N or more, the textile will have sufficient tensile strength. Further, since the tensile strength of the textile decomposition yarn is 8.0 N or less, the obtained airbag can ensure the elongation and flexibility of the weaving yarn, and has excellent deployment performance.
  • the elongation of the decomposed yarn is preferably 20% or more, more preferably 20.5% or more, and even more preferably 21% or more.
  • the elongation of the decomposed yarn is preferably 30% or less, more preferably 29.5% or less, and even more preferably 29% or less. If the elongation of the textile decomposition yarn is 20% or more, the resulting airbag will have excellent deployment performance. Further, by setting the amount to 30% or less, the resulting airbag can have low air permeability.
  • the polyamide fiber of this embodiment is a polyamide fiber made of dicarboxylic acid, diamine, and polycondensate.
  • the polyamide resin constituting the polyamide fiber preferably contains a biomass-derived monomer in at least one of dicarboxylic acid and diamine. That is, it is preferable that the polyamide fiber contains a polyamide resin synthesized from a biomass-derived monomer. Further, the content of polyamide synthesized from biomass-derived monomers in the polyamide fiber is preferably 25% by weight or more, more preferably 70% by weight or more, and even more preferably 100% by weight. .
  • the polyamide fibers are preferably polyamide 410 fibers.
  • the dicarboxylic acid component and diamine component are not particularly limited. In this embodiment, it is preferable that at least a part of the material is obtained from a biomass-derived raw material.
  • the polyamide of this embodiment contains heat stabilizers, antioxidants, light stabilizers, smoothing agents, antistatic agents, plasticizers, thickeners, It may also contain additives such as agents, pigments, and flame retardants.
  • the polyamide fiber of this embodiment is synthesized from biomass-derived compounds.
  • One method is ASTM D6866, which is based on the principle of C14 (radiocarbon) dating. Specifically, after drying the sample (polymer) to remove moisture, it is weighed, and the CO 2 generated by burning the sample is adsorbed to an adsorbent through chemical operations and measured using a liquid scintillation counter.
  • Samples can be prepared by various methods, such as converting the CO 2 generated by combustion into carbon graphite and measuring it with an accelerator mass spectrometer, or synthesizing benzene from the CO 2 generated by combustion and measuring it with a liquid scintillation counter. The concentration of biomass ratio within can be determined.
  • the polyamide resin of this embodiment preferably has a sulfuric acid relative viscosity, which is an index of molecular weight, of 2.0 to 5.0 from the viewpoint of mechanical properties such as strength and elongation.
  • the sulfuric acid melt viscosity refers to a value measured using raw material chips. The higher the relative viscosity of sulfuric acid, that is, the higher the molecular weight, the higher the strength of the resulting fibers, which is preferable.
  • the relative viscosity of sulfuric acid is within a suitable range, polyamide resin can be melt-spun at an appropriate spinning temperature, and thermal decomposition of the polymer in the spinning machine is suppressed, resulting in good spinning properties and fibers.
  • the relative viscosity of sulfuric acid is preferably 2.2 or more, more preferably 2.5 or more. Further, the relative viscosity of sulfuric acid is more preferably 4.8 or less, more preferably 4.5 or less. In this embodiment, the sulfuric acid relative viscosity can be measured by the method described below.
  • the cross-sectional shape of the single fiber of the polyamide fiber of this embodiment may be a circular cross-section or a flat cross-section.
  • the method for spinning polyamide fibers of this embodiment will be explained.
  • the polyamide fiber of this embodiment can be produced by using the polyamide resin produced as described above, obtaining an undrawn yarn by a melt spinning method, and then subjecting it to stretching.
  • the spinning temperature in melt spinning is preferably 10 to 70°C higher than the melting point of the polymer.
  • the spinning temperature is more preferably at most 60°C higher than the melting point of the polymer, and even more preferably at most 50°C higher than the melting point of the polymer.
  • the spinning temperature is more preferably 12°C or more higher than the polymer melting point, and even more preferably 15°C or more higher than the polymer melting point.
  • an oil agent may be applied.
  • the type of oil agent is not particularly limited.
  • the airbag fabric of this embodiment includes polyamide fibers as weaving yarns (warp and weft).
  • polyamide fibers as weaving yarns (warp and weft).
  • biomass-derived polyamide fibers as the main constituents of the warp and weft yarns in order to impart properties to the fabric.
  • the blending ratio of the polyamide fibers of this embodiment is preferably 50% by weight or more, more preferably 70% by weight or more, and even more preferably 90% by weight or more.
  • synthetic fibers, semi-synthetic fibers, and natural fibers other than polyamide fibers may be mixed with polyamide fibers as long as the effects of this embodiment are not impaired.
  • filaments with a single fiber fineness of 1 to 7 dtex as the polyamide fibers used as the base yarn of the fabric.
  • the single fiber fineness is 7 dtex or less, the voids occupied between the single fibers in the woven fabric become smaller, the fiber filling effect is further improved, and the amount of air permeability can be reduced.
  • the stiffness of the filament is appropriately reduced, and the resulting fabric for airbags has improved flexibility and storage properties.
  • the total fineness of the polyamide fibers used as the base yarn of the fabric is preferably 20 to 900 dtex.
  • the total fineness is more preferably 25 dtex or more, and even more preferably 30 dtex or more.
  • the total fineness is more preferably 800 dtex or less, and even more preferably 700 dtex or less.
  • the boiling water shrinkage rate of the polyamide fiber used as the ground yarn of the fabric is preferably less than 5.8%, more preferably less than 5%. Since the boiling water shrinkage rate is less than 5.8%, and even less than 5.0%, the polyamide fiber has excellent shape stability. In addition, the degree of orientation of molecular chains of polyamide fibers does not significantly decrease during treatment with boiling water, and the strength does not easily decrease even after treatment. On the other hand, by having a boiling water shrinkage rate of 2.0% or more, more preferably 2.5% or more, the airbag fabric can have a higher weave density by heat shrinking. Boiling water shrinkage rate is affected by hydrogen bonding between the amide groups of oriented polymer chains and water molecules, which disrupts the orientation of the polymer. Polyamide 410 is preferable because the ratio of amide groups in the polymer chain satisfies the above-mentioned boiling water shrinkage rate.
  • the structure of the airbag fabric of this embodiment is not particularly limited.
  • the textile structure may be a plain weave, a twill weave, a satin weave, a variation thereof, a multi-axis weave, or the like.
  • a plain weave is preferable because it has excellent mechanical properties and is thin.
  • the weaving density can vary depending on whether the fabric is resin-treated or not, and the fineness of the yarn.
  • the cover factor is preferably 1850 to 2450 in order to achieve both low air permeability, high slip resistance, and morphological stability.
  • the cover factor is more preferably 1860-2440, still more preferably 1870-2430.
  • airbag fabrics can maintain appropriate mechanical properties (tensile strength, tear strength, etc.) necessary for airbags, and have an appropriate basis weight. It is easy to use and does not easily become rough or hard.
  • the cover factor is 1850 or more, the airbag fabric becomes dense, restricts movement between fibers, increases form stability, and is less prone to misalignment.
  • the cover factor is 2450 or less, the basis weight of the airbag fabric does not become too large, and the airbag fabric does not easily become coarse and hard.
  • the cover factor (CF) is defined by the following equation (1).
  • CF (Dw ⁇ 0.9)1/2 ⁇ Nw+(Df ⁇ 0.9)1/2 ⁇ Nf...
  • Dw is the warp total fineness (dtex)
  • Nw is the warp density (strands/2.54 cm)
  • Df is the weft total fineness (dtex)
  • Nf is the weft density (windows/2.54 cm). /2.54cm).
  • the tensile strength of the fabric of this embodiment is preferably 1500 N/50 mm or more, more preferably 1800 N/50 mm or more, and even more preferably 2000 N/50 mm in both the warp direction and the weft direction. Further, the tensile strength of the woven fabric is preferably 4500 N/50 mm or less, more preferably 4000 N/50 mm or less in both the warp direction and the weft direction. When the tensile strength is within the above range, the woven fabric has better mechanical properties.
  • the tensile elongation of the fabric of this embodiment is preferably 15% or more, more preferably 17% or more, and even more preferably 20% in both the warp and weft directions. Further, the tensile strength of the woven fabric is preferably 45% or less, more preferably 40% or less in both the warp direction and the weft direction. When the tensile elongation is within the above range, the woven fabric has excellent shock absorption properties.
  • the tear strength of the woven fabric of this embodiment is preferably 80 N or more, more preferably 100 N or more in both the warp direction and the weft direction. Further, the tear strength of the woven fabric is preferably 500 N or less, more preferably 450 N or less in both the warp direction and the weft direction.
  • the resulting airbag is less likely to be torn when stress, etc. is concentrated when it deploys to catch an occupant. As a result, the deployed airbag is prevented from forming a vent.
  • the slip resistance value of the woven fabric of this embodiment is preferably 150 N or more, more preferably 200 N or more in both the warp direction and the weft direction. Further, the slip resistance value of the woven fabric is preferably 900 N or less, more preferably 800 N or less in both the warp direction and the weft direction.
  • the slip resistance value is within the above range, the resulting airbag has less misalignment of the stitched portions. As a result, in the airbag obtained, hot gas from the inflator is difficult to leak when deployed, internal pressure is easily maintained, and melting of the base fabric at the sewn portion is prevented.
  • the dynamic air permeability of the fabric of this embodiment is preferably 500 mm/s or less. When the dynamic air permeability is within the above range, an airbag with excellent internal pressure retention properties and low energy loss during airbag deployment can be obtained.
  • ⁇ Method for manufacturing airbag fabric In the method for manufacturing an airbag fabric according to the present embodiment, first, warps of polyamide fibers having the above-mentioned total fineness in relation to the fabric are warped and installed in a loom. Similarly, weft yarns of polyamide fibers are placed on the loom.
  • the loom is not particularly limited. Examples of the loom include a water jet loom, an air jet loom, and a rapier loom. Among these, a water jet loom is preferred as the loom because high-speed weaving is relatively easy and productivity can be easily increased.
  • the loom is preferably a water jet loom, especially since polyamide 410 has a low affinity with water among polyamides in terms of moisture content and boiling water shrinkage rate, and has little effect on the physical properties of the base fabric.
  • the material and type of the entangled yarn and additional yarn are appropriately selected depending on the type of base yarn and weaving density.
  • the materials for the entangled yarn and additional yarn are not particularly limited.
  • the material is preferably polyamide fiber or polyester fiber, which is excellent in mass productivity and economical efficiency.
  • types include monofilament, multifilament, spun yarn, etc.
  • the spun yarn is preferably multifilament or monofilament because it is less likely to cause trouble with the fluffing guide and heald.
  • the resulting fabric is subjected to a drying process, if necessary.
  • the drying temperature is usually 80°C or higher.
  • the drying temperature is 80° C. or higher, the dry heat shrinkage rate of the woven fabric is reduced and the dimensional stability is improved.
  • the fabric can be suitably used as an airbag.
  • the scouring temperature in the scouring process is preferably 30°C or higher, more preferably 45°C or higher.
  • the scouring temperature is set to 30° C. or higher, residual distortion in the woven fabric can be removed and dimensional stability can be improved.
  • the heat setting temperature in heat setting is preferably a temperature that can remove distortions remaining in the woven fabric after weaving and suppress large shrinkage of the woven fabric, as in the case of scouring.
  • the heat setting temperature is preferably 110°C or higher, more preferably 120°C or higher.
  • the heat setting temperature is 190° C. or lower.
  • the setting method is not particularly limited.
  • Tenter overfeed rate (Vw-Vs)/Vs ⁇ 100
  • the tenter width change rate is -5. It is preferable to adjust it within a range of about 0 to 5.0%, more preferably both -2.0 to 3.0%, and even more preferably -0.4 to 2.5%. Within the above range, a base fabric with excellent shape stability can be obtained.
  • the woven fabric that has undergone the above steps may be a coated woven fabric coated with a resin as appropriate.
  • the fabric of this embodiment can be made non-breathable by being coated.
  • a resin is applied to at least one side of the fabric, and the coating amount is about 5 to 35 g/m 2 .
  • the resin has heat resistance, cold resistance, and flame retardancy.
  • Suitable resins include, for example, silicone resins, polyamide resins, polyurethane resins, fluororesins, and elastomers.
  • the moisture content of the fabric measured according to JIS L1096:2010 8.10 is more than 0.5% and 2.5% or less, and the shrinkage rate after moist heat treatment is 2.40 in the warp direction. % or less, 0.90% or less in the weft direction, and a slip resistance retention rate of 96.0% or more after moist heat treatment.
  • the polyamide fiber contains polyamide synthesized from a biomass-derived monomer, and the content of the polyamide synthesized from the biomass-derived monomer is 70% by weight or more in the polyamide fiber, (1)
  • the airbag fabric according to any one of (7).
  • melting point was measured using a differential scanning calorimeter model DSC-7 manufactured by PerkinElmer. That is, 10 mg of the sample was heated to 280° C. at a heating rate of 16° C./min, and held for 5 minutes after heating. Thereafter, the sample was rapidly cooled down to room temperature, and then heated again to 280°C at a heating rate of 16°C/min. In the differential calorimetry curve obtained by raising the temperature again, the peak showing an extreme value on the endothermic side was determined to be the melting peak, and the temperature giving the extreme value was defined as the melting point (° C.). In addition, when multiple extreme values exist, the extreme value on the high temperature side was taken as the melting point. The number of measurements was three times, and the average value was taken as the melting point.
  • the flow time (T1) at 25° C. was measured using an Ostwald viscometer in 98% sulfuric acid at a concentration of 0.01 g/ml. Subsequently, the flow time (T2) of only sulfuric acid with a concentration of 98% by weight was measured.
  • the ratio of T1 to T2, ie, T1/T2 was defined as the relative viscosity of sulfuric acid. The number of measurements was three times, and the average value was taken as the sulfuric acid relative viscosity.
  • total fineness The total fineness was calculated by measuring the positive fineness at a predetermined load of 0.045 cN/dtex according to JIS L1013:2010 8.3.1 A method.
  • Number of filaments The number of filaments was calculated based on the method of JIS L1013:2010 8.4.
  • the SS curve of the sample was measured under the same environment with an initial load of 0.08 cN/dtex, a sample length of 250 mm, and a tensile speed of 300 m/min.
  • the strength was determined by dividing the strength at the point showing the maximum strength on the SS curve by the total fineness, and the average value of the three pieces was calculated.
  • the elongation was determined by dividing the elongation at the point showing the maximum strength on the SS curve by the sample length and multiplying by 100, and the average value of the three samples was calculated.
  • Boiling water shrinkage rate is JIS L1013:2010 8.16. Calculated based on method A.
  • the weaving density of each warp and weft was calculated based on JIS L 1096:2010 8.6.1. Specifically, the sample was placed on a flat table, and the number of warp and weft yarns in a 2.54 cm section was counted at five different locations, excluding unnatural wrinkles and tension, and the average value of each was calculated.
  • Tensile strength/elongation Tensile strength was determined based on ISO 13934-1 by taking five test pieces in each of the warp and weft directions, removing yarn from both sides of the width to make a width of 50 mm, and placing them in a constant speed tension type testing machine. The test piece was pulled at a gripping interval of 150 mm and a pulling speed of 200 mm/min until it broke, and the maximum load and elongation until breaking were measured, and the average values were calculated.
  • Tear strength was calculated based on ISO 13937-2. Specifically, the tear strength was determined by creating test pieces (15 cm x 20 cm) from five different locations on the fabric, and placing a 10 cm strip perpendicular to the short side in the center of the short side (7.5 cm from the edge). I made a cut. Using a material testing machine (Instron (registered trademark) 5965, manufactured by Instron Inc.), each section of this sample (the above-mentioned cut point (7.5 cm) The sample was held so that the 10 cm x 10 cm portion) was perpendicular to the upper and lower clamps, and the test was conducted at a tensile speed of 10 cm/min until the sample was torn 9 cm.
  • Instron registered trademark
  • the obtained stress-strain curve was divided into four parts from the first maximum point to the end point of the test, and the average of the maximum points in the remaining part (3/4 part) excluding the first 1/4 part was determined. This test was repeated three times, and the average value was taken as tear strength (N).
  • the maximum point is defined as a point where the average stress in the remaining portion (3/4 portion) has changed by 10% or more from the immediately preceding concave portion.
  • the sliding resistance force was calculated at five points each based on ASTM D6479-02 in the longitudinal and latitudinal directions before and after the moist heat treatment, and the sliding resistance retention rate was calculated using the following formula.
  • the moist heat treatment conditions were as follows: exposure in a moist heat oven at a temperature of 70° C. and a humidity of 95% RH for 408 hours.
  • moisture content of textile The moisture content was calculated based on JIS L1096:2010 8.10.
  • the sample was placed in a test room at a temperature of 20 ⁇ 2° C. and a relative humidity of 65 ⁇ 2% until it reached a constant weight, and then cut to a size of 25 cm in the warp direction x 25 cm in the latitude direction to obtain three square samples.
  • a test piece was prepared in which markers were marked with a shrink marker (manufactured by Daiei Kagaku Seiki Seisakusho Co., Ltd.) with a distance of 20 cm between two points in the warp and weft directions. After 408 hours of moist heat treatment under conditions of a temperature of 70° C. and a humidity of 95% RH, the test piece was taken out and left in a place with a temperature of 20 ⁇ 2° C.
  • Shrinkage rate after moist heat treatment ((20-a)/20) x 100 (Dry heat shrinkage rate) The sample was placed in a test room at a temperature of 20 ⁇ 2° C. and a relative humidity of 65 ⁇ 2% until it reached a constant weight, and then cut to a size of 25 cm in the warp direction x 25 cm in the latitude direction to obtain three square samples.
  • a test piece was prepared in which markers were marked with a shrink marker (manufactured by Daiei Kagaku Seiki Seisakusho Co., Ltd.) with a distance of 20 cm between two points in the warp and weft directions.
  • the test piece was placed in a high temperature dryer set at 150°C and left for 30 minutes, then taken out and left at a temperature of 20 ⁇ 2°C and a relative humidity of 65 ⁇ 2% for one day or more.
  • the length between the two markers of the test piece (length after treatment, bcm) was measured.
  • the shrinkage rate after the moist heat treatment was calculated using the following formula, and the three values in each of the warp and weft directions were averaged to determine the shrinkage rate after the wet heat treatment.
  • Shrinkage rate (%) after moist heat treatment ((20-b)/20) x 100
  • a module was assembled using a driver's seat airbag, pyro-type inflator (output 190 kpa), pressure gauge, amplifier, and fixing hardware.
  • a deployment test was conducted in an environment of 25° C., and the presence or absence of melting of the airbag fabric during deployment, the presence or absence of openings in the stitched portion, and the presence or absence of bursts were observed. The evaluation is based on whether there is any damage to the airbag fabric, and the airbag fabric has no melt holes, no openings or holes in the sewing area, and no bursts. If the airbag fabric had openings or holes and no burst, it was rated "fair", and if the airbag fabric had burst, it was rated "poor”. And so.
  • the airbag for the driver's seat was created as shown below.
  • Two circular main body panels with an outer diameter of ⁇ 620 mm and three circular reinforcing fabric panels with an outer diameter of ⁇ 240 mm were taken from the prepared airbag base fabric.
  • An inflator installation hole with a diameter of 76 mm was provided at the center of the main body panel and reinforcing fabric panel.
  • the attachment openings of the three reinforcing fabric panels and one main body panel were overlapped, and the positions ⁇ 85mm, ⁇ 180mm, and ⁇ 196mm from the center of the attachment opening were sewn into a circular shape using lockstitching at a pitch of 2.5mm.
  • stack another main body panel on top of the above 4 panels so that the warp direction is shifted by 45 degrees, and stitch a double chainstitch with a pitch of 2.5 mm at a position of ⁇ 590 mm from the center of the installation opening. Then I sewed it into a circle.
  • the bag was turned over so that the reinforcing fabric was on the inside, creating an airbag for the driver's seat.
  • the obtained bag was left exposed in a moist heat oven at a temperature of 70° C. and a humidity of 95% RH for 408 hours.
  • Example 1 (warp, weft) Made of polyamide 410 made by melt-spinning nylon 410 resin and using 100% sebacic acid derived from biomass (71% by weight derived from biomass), it has a circular cross-sectional shape and a fiber 136 filament with a single fiber fineness of 2.7 dtex. A non-twisted polyamide 410 fiber was obtained which consisted of a total fineness of 362 dtex, a tensile strength (yarn strength) of 7.80 cN/dtex, an elongation of 23.0%, and a boiling water shrinkage rate of 3.5%. This was prepared as warp and weft.
  • a plain woven fabric was woven using the above-mentioned yarn as the ground yarn for the warp and weft using a water jet loom equipped with full-width temples.
  • twining threads and extra threads were used for both edges of the fabric.
  • Nylon 66 monofilament with a circular cross-sectional shape, 22 detex, tensile strength of 4.80 cN/dtex, elongation of 47.5%, and boiling water shrinkage rate of 10.5% was used as the twining thread, and both ears were Two units were supplied to each department from the planetary equipment.
  • the additional thread used was 22 dtex nylon 66 monofilament similar to the entangled thread, and four threads were supplied from the bobbin to both ears.
  • the obtained fabric was scoured at 65°C using an open soaper type scouring machine, washed with hot water at 40°C, and dried at 120°C. Furthermore, the fabric was heat set at 160°C for 60 seconds at a tenter width change rate of -0.5% and a tenter overfeed rate of 0%, and the warp density was 60.1/2.54 cm and the weft density was 60. A fabric of 4 pieces/2.54 cm was obtained.
  • the results are shown in Table 1.
  • the obtained woven fabric has a moisture content of 2.1%, a shrinkage rate of 2.12% in the warp direction, 0.80% in the weft direction, and a slip resistance retention rate of 98.4% after moist heat aging.
  • the airbag deployment test there was no thermal melting, no opening of the seams, and no bursting, and the deployability was good.
  • Example 2 It is made of polyamide 410 made by melt-spinning nylon 410 resin and using 100% sebacic acid derived from biomass, has a circular cross-sectional shape, is composed of 136 filaments with a single fiber fineness of 3.5 dtex, and has a total fineness of 3.5 dtex. Untwisted polyamide 410 fibers having a tensile strength of 482 dtex, a tensile strength of 7.75 cN/dtex, an elongation of 22.6%, and a boiling water shrinkage rate of 3.7% were obtained.
  • a fabric for an airbag was produced in the same manner as in Example 1 by changing the warp and weft to this filament, and the fabric had a warp density of 50.9 pieces/2.54 cm and a weft density of 50.2 pieces/2.54 cm. I got it.
  • the subsequent scouring and heat setting were the same as in Example 1.
  • the results are shown in Table 1.
  • the obtained fabric had a moisture content of 2.4%, a shrinkage rate of 1.60% in the warp direction, 0.59% in the weft direction, and a slip resistance retention rate of 101.2% after moist heat aging.
  • the airbag deployment test there was no thermal melting, no opening of the seams, and no bursting, and the deployability was good.
  • Example 3 It is made of polyamide 410 made by melt-spinning nylon 410 resin and using 100% sebacic acid derived from biomass, has a circular cross-sectional shape, and is composed of 72 filaments with a single fiber fineness of 6.4 dtex, and has a total fineness of 6.4 dtex. Untwisted polyamide 410 fibers having a tensile strength of 464 dtex, a tensile strength of 7.70 cN/dtex, an elongation of 22.2%, and a boiling water shrinkage rate of 3.5% were obtained.
  • a fabric for an airbag was produced in the same manner as in Example 1 by changing the warp and weft to these filaments, and the fabric had a warp density of 54.7 threads/2.54 cm and a weft thread density of 54.2 threads/2.54 cm. I got it.
  • the subsequent scouring and heat setting were the same as in Example 1.
  • the results are shown in Table 1.
  • the obtained woven fabric has a moisture content of 2.2%, a shrinkage rate of 1.48% in the warp direction and 0.58% in the weft direction after moist heat aging, and a slip resistance retention rate of 100.0%.
  • the airbag deployment test there was no thermal melting, no opening of the stitched parts, and no bursting, and the deployability was good.
  • Example 4 It is made of polyamide 410 made by melt-spinning nylon 410 resin and using 100% sebacic acid derived from biomass, has a circular cross-sectional shape, is composed of 136 filaments with a single fiber fineness of 3.5 dtex, and has a total fineness of 3.5 dtex. Untwisted polyamide 410 fibers having a tensile strength of 8.44 cN/dtex, an elongation of 22.2%, and a boiling water shrinkage rate of 5.0% were obtained.
  • An airbag fabric was produced in the same manner as in Example 1, except that the warp and weft were changed to this filament, and the tenter width change rate was 1.2%, and the tenter overfeed rate was 2.0%.
  • a woven fabric with a weft density of 53.0 threads/2.54 cm and a weft density of 52.7 threads/2.54 cm was obtained. The subsequent scouring and heat setting were the same as in Example 1.
  • the results are shown in Table 1.
  • the resulting fabric had a moisture content of 2.4%, a shrinkage rate of 1.12% in the warp direction, 0.48% in the weft direction, and a slip resistance retention rate of 100.6% after moist heat aging.
  • the airbag deployment test there was no thermal melting, no opening of the seams, and no bursting, and the deployability was good.
  • Example 1 An airbag fabric was produced in the same manner as in Example 1 using the filament of Example 3 as the ground yarn for the warp and weft, and the density of the warp was 45.0/2.54 cm, and the density of the weft was 45.3/2.54 cm. A 2.54 cm woven fabric was obtained. The subsequent scouring and heat setting were the same as in Example 1.
  • the results are shown in Table 1.
  • the obtained woven fabric has a moisture content of 2.0%, a shrinkage rate after moist heat aging of 2.52% in the warp direction, 0.98% in the weft direction, a slip resistance retention rate of 100.5%, and a stable shape.
  • the airbag did not exhibit excellent performance, and a burst occurred in the airbag deployment test after deterioration due to moist heat.
  • the warp and weft are made of nylon 66 derived from petroleum resources, have a circular cross-sectional shape, are composed of 136 filaments with a single fiber fineness of 2.7 dtex, have a total fineness of 365 dtex, and have a tensile strength of 8.47 cN. /dtex, an elongation of 24.5%, and a boiling water shrinkage rate of 6.2%.
  • An airbag fabric was produced in the same manner as in Example 1, except that the fiber had a warp density of 59.2.
  • a woven fabric with a thread/2.54 cm and a weft density of 61.1/2.54 cm was obtained.
  • the results are shown in Table 1.
  • the obtained woven fabric has a moisture content of 3.6%, a shrinkage rate of 2.46% in the warp direction, 0.95% in the weft direction, and a slip resistance retention rate of 95.3% after moist heat aging.
  • the seams opened in the seams.
  • the warp and weft are made of nylon 66 derived from petroleum resources, have a circular cross-sectional shape, are composed of 136 filaments with a single fiber fineness of 3.6 dtex, have a total fineness of 486 dtex, and have a tensile strength of 8.41 cN. /dtex, an elongation of 24.6%, and a boiling water shrinkage rate of 6.4%.
  • An airbag fabric was produced in the same manner as in Example 1 except that the fiber had a warp density of 49.5.
  • a woven fabric with a yarn density of 50.3 yarns/2.54 cm and a weft yarn density of 50.3 yarns/2.54 cm was obtained.
  • the results are shown in Table 1.
  • the obtained woven fabric has a moisture content of 3.8%, a shrinkage rate after wet heat aging of 2.36% in the warp direction, 0.63% in the weft direction, and a slip resistance retention rate of 95.4%.
  • the seams opened in the seams.
  • the warp and weft are made of polyester derived from petroleum resources, have a circular cross-sectional shape, are composed of 136 filaments with a single fiber fineness of 4.1 dtex, have a total fineness of 556 dtex, and have a tensile strength of 7.85 cN/
  • An airbag fabric was produced in the same manner as in Example 1 by changing to untwisted polyester fiber with dtex, elongation of 20.8%, and boiling water shrinkage rate of 5.9%, and the warp density was 51.4// A woven fabric having a length of 2.54 cm and a weft density of 51.0 threads/2.54 cm was obtained.
  • the results are shown in Table 1.
  • the obtained woven fabric has a moisture content of 0.4%, a shrinkage rate of 1.52% in the warp direction and 0.61% in the weft direction after moist heat aging, and a slip resistance retention rate of 94.8%.
  • the seams opened in the seams.

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  • Engineering & Computer Science (AREA)
  • Textile Engineering (AREA)
  • Mechanical Engineering (AREA)
  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • General Chemical & Material Sciences (AREA)
  • Woven Fabrics (AREA)
  • Air Bags (AREA)

Abstract

L'invention concerne un tissu de coussin de sécurité gonflable présentant une fiabilité environnementale élevée et conservant des caractéristiques mécaniques et une perméabilité à l'air pour un coussin de sécurité gonflable même en améliorant parallèlement la stabilité de forme et la résistance au glissement aux coutures dans des conditions de température élevée et d'humidité élevée. Ce tissu de coussin de sécurité gonflable est constitué de fibres de polyamide et présente une teneur en humidité supérieure à 0,5 % mais inférieure ou égale à 2,5 % telle que mesurée selon la norme JIS L1096:2010 8.10, un pourcentage de contraction inférieur ou égal à 2,40 % dans la direction de chaîne et inférieur ou égal à 0,90 % dans la direction de trame après un traitement thermique humide, et une rétention de résistance au glissement supérieure ou égale à 96,0 % après le traitement thermique humide.
PCT/JP2023/027639 2022-09-02 2023-07-27 Tissu de coussin de sécurité gonflable WO2024048153A1 (fr)

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20220259775A1 (en) * 2019-07-12 2022-08-18 Php Fibers Gmbh Airbag fabric

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2013049930A (ja) * 2011-08-31 2013-03-14 Toray Ind Inc ポリアミド４１０繊維およびそれからなる繊維構造体
WO2020153446A1 (fr) * 2019-01-23 2020-07-30 東洋紡株式会社 Tissu de base revêtu pour coussin de sécurité gonflable et coussin de sécurité gonflable le comprenant
US20220259775A1 (en) * 2019-07-12 2022-08-18 Php Fibers Gmbh Airbag fabric
WO2023037982A1 (fr) * 2021-09-09 2023-03-16 東レ株式会社 Tissu de coussin de sécurité gonflable et coussin de sécurité gonflable

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2013049930A (ja) * 2011-08-31 2013-03-14 Toray Ind Inc ポリアミド４１０繊維およびそれからなる繊維構造体
WO2020153446A1 (fr) * 2019-01-23 2020-07-30 東洋紡株式会社 Tissu de base revêtu pour coussin de sécurité gonflable et coussin de sécurité gonflable le comprenant
US20220259775A1 (en) * 2019-07-12 2022-08-18 Php Fibers Gmbh Airbag fabric
WO2023037982A1 (fr) * 2021-09-09 2023-03-16 東レ株式会社 Tissu de coussin de sécurité gonflable et coussin de sécurité gonflable

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20220259775A1 (en) * 2019-07-12 2022-08-18 Php Fibers Gmbh Airbag fabric

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