JP2009097134A - Coated base fabric for airbag - Google Patents

Coated base fabric for airbag Download PDF

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JP2009097134A
JP2009097134A JP2008198725A JP2008198725A JP2009097134A JP 2009097134 A JP2009097134 A JP 2009097134A JP 2008198725 A JP2008198725 A JP 2008198725A JP 2008198725 A JP2008198725 A JP 2008198725A JP 2009097134 A JP2009097134 A JP 2009097134A
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base fabric
coated base
fabric
elastomer
coating
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JP5374089B2 (en
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Hiroyuki Kobayashi
裕之 小林
Kazumi Shiga
一三 志賀
Yasushi Ozaki
康司 尾崎
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Toyoda Gosei Co Ltd
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Toyoda Gosei Co Ltd
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Priority to JP2008198725A priority Critical patent/JP5374089B2/en
Priority to US12/232,390 priority patent/US8142869B2/en
Priority to EP20080016288 priority patent/EP2042649B1/en
Priority to CN2008101683058A priority patent/CN101397707B/en
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29B—PREPARATION OR PRETREATMENT OF THE MATERIAL TO BE SHAPED; MAKING GRANULES OR PREFORMS; RECOVERY OF PLASTICS OR OTHER CONSTITUENTS OF WASTE MATERIAL CONTAINING PLASTICS
    • B29B17/00—Recovery of plastics or other constituents of waste material containing plastics
    • B29B17/04—Disintegrating plastics, e.g. by milling
    • B29B17/0412—Disintegrating plastics, e.g. by milling to large particles, e.g. beads, granules, flakes, slices
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29K—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES B29B, B29C OR B29D, RELATING TO MOULDING MATERIALS OR TO MATERIALS FOR MOULDS, REINFORCEMENTS, FILLERS OR PREFORMED PARTS, e.g. INSERTS
    • B29K2077/00—Use of PA, i.e. polyamides, e.g. polyesteramides or derivatives thereof, as moulding material
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29K—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES B29B, B29C OR B29D, RELATING TO MOULDING MATERIALS OR TO MATERIALS FOR MOULDS, REINFORCEMENTS, FILLERS OR PREFORMED PARTS, e.g. INSERTS
    • B29K2277/00—Use of PA, i.e. polyamides, e.g. polyesteramides or derivatives thereof, as reinforcement
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29K—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES B29B, B29C OR B29D, RELATING TO MOULDING MATERIALS OR TO MATERIALS FOR MOULDS, REINFORCEMENTS, FILLERS OR PREFORMED PARTS, e.g. INSERTS
    • B29K2313/00—Use of textile products or fabrics as reinforcement
    • B29K2313/02—Use of textile products or fabrics as reinforcement coated
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29L—INDEXING SCHEME ASSOCIATED WITH SUBCLASS B29C, RELATING TO PARTICULAR ARTICLES
    • B29L2022/00—Hollow articles
    • B29L2022/02—Inflatable articles
    • B29L2022/027—Air bags
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
    • Y02W30/00—Technologies for solid waste management
    • Y02W30/50—Reuse, recycling or recovery technologies
    • Y02W30/62—Plastics recycling; Rubber recycling

Abstract

<P>PROBLEM TO BE SOLVED: To provide a coated base fabric for airbags including: a cloth obtained by weaving polyamide (PA) fiber yarns; and a PA elastomer coating film formed on one surface or both surfaces of the cloth, wherein the coated base fabric has predetermined air tightness and flexibility, is easily converted to a PA reproduced material. <P>SOLUTION: The coated base fabric for airbags is obtained by fusing a coating film 16 made of an airflow suppression PA elastomer on one surface or both surfaces of a cloth 14 obtained by weaving yarns 12 and 12A made of a polyamide (PA) fiber. As the PA elastomer, soft PA is normally used, which has a melting point (measured by the standard of ASTM D3418) of 135 to 200°C, a difference between the melting points of the PA fiber and PA elastomer being 80 to 120°C. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

発明は、エアバッグ用コート基布及び該コート基布の廃材からなるポリアミド(ＰＡ)再生材に関する。   The present invention relates to a coated base fabric for airbags and a polyamide (PA) recycled material made of a waste material of the coated base fabric.

自動車には、乗員保護のためのエアバッグ装置が装着されている。エアバッグ装置に組み込まれるエアバッグの基布としては、ＰＡ繊維糸（例えば、ナイロン６６）で織成（通常、平織）した布帛（ノンコート基布）、又は、該布帛の片面又は両面にエラストマー塗膜を形成したコート布帛（コート基布）の２種類ある。   An automobile is equipped with an airbag device for protecting an occupant. The airbag base fabric incorporated in the airbag device may be a fabric woven (usually plain weave) with PA fiber yarn (for example, nylon 66) (uncoated base fabric), or an elastomer coating on one or both sides of the fabric. There are two types of coated fabric (coated base fabric) on which a film is formed.

エアバッグ装置が助手席用も含み全車標準装備となった昨今、エアバッグ用基布の廃材（基布裁断時に発生する端材を含む。以下同じ。）が多量に発生する。   Nowadays, airbag devices have become standard equipment for all passenger cars, including passenger seats, and waste materials for airbag fabrics (including scrap materials generated during cutting of the fabric fabric; the same applies hereinafter) are generated in large quantities.

そして、循環型社会構築の見地から、上記基布の廃材をＰＡ再生材としてリサイクル（再利用）する要請が増大してきている。   From the viewpoint of building a recycling-oriented society, there is an increasing demand for recycling (reusing) the waste material of the base fabric as a PA recycled material.

ノンコート基布は、ＰＡ繊維糸のみからなり再生が容易であるため、リサイクルが実用化されている。   Since the non-coated base fabric is made of only PA fiber yarns and can be easily recycled, recycling has been put to practical use.

しかし、コート基布は、特許文献１〜３に示す如く、ＰＡ繊維糸からなる布帛に、シリコーンゴム乃至シリコーン樹脂をコートしたものが主流であった。   However, as the coated base fabric, as shown in Patent Documents 1 to 3, a fabric made of PA fiber yarn is mainly coated with silicone rubber or silicone resin.

すなわち、特許文献１段落0013には、エラストマー塗膜の塗膜材として、「クロロプレンゴム、クロルスルフォン化ゴム、シリコーンゴム」と記載され、特許文献２段落0061には「シリコーン樹脂、ポリウレタン樹脂、ポリアミド系樹脂」と記載され、特許文献３には、「クロロプレン、クロルスルフォン化オレフィン、シリコーンゴム、ポリアミド系エラストマー、・・・」と記載されている。そして、いずれの特許文献も耐熱性が良好な「シリコーンゴム（シリコーン樹脂）」が、実施例として記載されていたり、特に好ましいと記載されていたりする。   That is, in Patent Document 1, paragraph 0013, “chloroprene rubber, chlorosulfonated rubber, silicone rubber” is described as a coating material for an elastomer coating, and in Patent Document 2, paragraph 0061, “silicone resin, polyurethane resin, polyamide” Patent Document 3 describes “chloroprene, chlorosulfonated olefin, silicone rubber, polyamide elastomer,...”. In any patent document, “silicone rubber (silicone resin)” having good heat resistance is described as an example or particularly preferable.

本願出願前においては、「エラストマー塗膜の材料としては、布帛と同等以上の耐熱性に優れたゴム乃至樹脂でなければならないとする。」のが当業者常識であったことが伺える。   Prior to the filing of the present application, it can be said that it was common knowledge to those skilled in the art that “the material of the elastomer coating film must be a rubber or a resin excellent in heat resistance equal to or higher than that of the fabric”.

なお、特許文献２・３には、エラストマー塗膜の形成材料として、ＰＡエラストマーも例示はされているが、リサイクルを予定していないことは勿論、上記記載から、本発明のような低融点のものを予定していないと想像される。しかし、そのような高融点のＰＡエラストマーを使用した場合、基布に所要の気密度（低通気量）を確保しながら、柔軟性を確保することは困難と推定される。   In Patent Documents 2 and 3, PA elastomer is also exemplified as a material for forming the elastomer coating film, but it is not planned to be recycled. Imagine not planning on anything. However, when such a high melting point PA elastomer is used, it is estimated that it is difficult to ensure flexibility while ensuring a required air density (low air flow rate) in the base fabric.

特に、昨今、乗員保護のために、エアバッグの機能についてより迅速かつ高精度の初期拘束性を確保する要請が増大してきているため、エアバッグ展開性の見地から、さらなる高気密度が要求されるようになってきている。他方、エアバッグの折り畳み性と上記エアバッグ展開性からも所要の柔軟性（低反発弾性）も必須要件である。   In recent years, in order to protect passengers, there has been an increasing demand for ensuring quicker and more accurate initial restraint on the functions of airbags, so that higher air density is required from the standpoint of airbag deployment. It is becoming. On the other hand, the required flexibility (low rebound resilience) is also an essential requirement in view of the foldability of the airbag and the deployability of the airbag.

一般的に、コート基布において、上記高気密度と柔軟性とは二律背反的要請であるとするのが当業者常識であった。すなわち、高気密度を確保するためには、相対的に厚肉の塗膜とする必要がある、しかし、塗膜を厚くすると、エアバッグの質量が増加し、また、相対的に反発弾性が大きくなって柔軟性を確保し難くなるとともに、折畳み性にも悪影響を与える。   In general, it has been common knowledge to those skilled in the art that in the coated base fabric, the high air density and flexibility are contradictory requirements. In other words, in order to ensure a high air density, it is necessary to make the coating film relatively thick. However, if the coating film is thick, the mass of the airbag increases and the resilience is relatively low. It becomes large and it becomes difficult to ensure flexibility, and it also has an adverse effect on foldability.

なお、本発明と同様のＰＡエラストマー（軟質ＰＡ）をエラストマー塗膜の塗膜材として、明記されている公知文献として、特許文献４・５がある。   Patent Documents 4 and 5 are publicly known documents in which PA elastomer (soft PA) similar to the present invention is used as a coating material for an elastomer coating film.

すなわち、特許文献４の請求項１には、「合成繊維糸を構成要素とするエアバッグ用基布であって水溶性または水分散性の合成樹脂で含浸処理されてなり、該合成樹脂は、厚み：0.3ｍｍのフィルム形状とし、引張試験機により、チャック間距離：35ｍｍ、引張速度：300ｍｍ／分の条件で引張試験を行った際に、引張伸びが200％以上であり、且つ200％伸張時の強度が５MPa以下であることを特徴とするエアバッグ用基布。」と記載され、同請求項２には、「合成樹脂は、ポリウレタン樹脂、アクリル樹脂、ポリエステル樹脂およびポリアミド樹脂から選択される」ことが記載され、さらに、
段落0028には、軟質ＰＡとして「トレジン（帝国化学産業社製商品名：N-メトキシメチル化ナイロン）」が好適例とされている。 That is, in claim 1 of Patent Document 4, “a base fabric for an airbag having a synthetic fiber yarn as a constituent element, which is impregnated with a water-soluble or water-dispersible synthetic resin, Thickness: 0.3 mm film shape, and tensile test was performed with a tensile tester at a distance between chucks of 35 mm and a tensile speed of 300 mm / min. The base fabric for an air bag is characterized in that the strength at the time is 5 MPa or less. ”In claim 2,“ the synthetic resin is selected from polyurethane resin, acrylic resin, polyester resin and polyamide resin ”. In addition,
In Paragraph 0028, “Toresin (trade name: N-methoxymethylated nylon manufactured by Teikoku Chemical Industry Co., Ltd.)” is a preferred example of the soft PA.

しかし、該軟質ＰＡ（ＰＡエラストマー）では、所定の気密度は、確保し難いと推定される。「トレジン」の商品説明書（ナガセケムテックス株式会社発行）によれば、水蒸気透過性(g・cm/cm2・s・cmHg×1012：38℃、24ｈ、フィルム厚25μ)において、「トレジンＦ−３０Ｋ」は「3060」で「再生セルロース」の「3800」に近い数値を示し、「ナイロン６」の「160」と20倍以上の差があるためである。 However, with the soft PA (PA elastomer), it is estimated that a predetermined air density is difficult to ensure. According to the “Toresin” product description (issued by Nagase ChemteX Corporation), the water vapor permeability (g · cm / cm 2 · s · cmHg × 1012: 38 ° C, 24h, film thickness 25μ) This is because “-30K” is “3060”, which is close to “3800” of “regenerated cellulose”, and is more than 20 times different from “160” of “nylon 6”.

また、「トレジン」は、アルコール可溶性ナイロンであり、塗料として溶液タイプを予定している。このため、塗膜形成樹脂が、布帛の隙間に侵入してコート基布に柔軟性を確保し難いものと推定される。   “Toresin” is an alcohol-soluble nylon, and a solution type is planned as a paint. For this reason, it is presumed that the coating film-forming resin penetrates into the gaps of the fabric and it is difficult to ensure the flexibility of the coated base fabric.

また、特許文献５には、布帛をナイロン６６とし、該布帛の片面にＰＡエラストマー（ソフトセグメントをアミノ変性ポリエーテルとするブロック共重合体）からなる乾燥塗膜が記載されている。しかし、本文献における塗膜の乾燥温度は、実施例１では乾燥仕上げ温度が110℃であり（段落００１８）、ＰＡエラストマーは溶融して、塗膜が布帛に融着形成されているとは考え難い。
特開平6-81274号公報 特開2004-176221号公報 特開2006-249655号公報 特開2004-218138号公報 特開2008-13897号公報 Patent Document 5 describes a dry coating film made of nylon 66 as a fabric and PA elastomer (a block copolymer having a soft segment as an amino-modified polyether) on one side of the fabric. However, the drying temperature of the coating film in this document is that the drying finishing temperature is 110 ° C. in Example 1 (paragraph 0018), and it is considered that the PA elastomer is melted and the coating film is fused to the fabric. hard.
JP-A-6-81274 JP 2004-176221 A JP 2006-249655 A JP 2004-218138 A JP 2008-13897

本発明は、上記にかんがみて、ＰＡ繊維糸で織成された布帛の片面又は両面にＰＡエラストマー塗膜が形成されているエアバッグ用コート基布において、所定の気密度とともに柔軟性を有し、さらには、ＰＡ再生材とすることが容易なエアバッグ用コート基布を提供することを目的（課題）とする。   In view of the above, the present invention provides a coated base fabric for an airbag in which a PA elastomer coating film is formed on one or both sides of a fabric woven with PA fiber yarns, and has flexibility with a predetermined air density. Furthermore, it is an object (problem) to provide a coated base fabric for an air bag that can be easily made into a PA recycled material.

本発明は、上記課題（目的）を、下記構成により解決する。   The present invention solves the above problem (object) by the following configuration.

ポリアミド（ＰＡ）繊維の糸で織成された布帛の少なくとも片面にＰＡエラストマーの塗膜が形成されてなるエアバッグ用のコート基布において、
ＰＡエラストマーが、融点（ASTM D3418。以下同じ。）135〜200℃を示すものであり、且つ、ＰＡ繊維との融点差が80〜120℃とされて、ＰＡエラストマー塗膜が布帛に融着形成されていることを特徴とする。 In a coated base fabric for an air bag in which a coating film of PA elastomer is formed on at least one side of a fabric woven with polyamide (PA) fiber yarns,
The PA elastomer has a melting point (ASTM D3418; the same applies hereinafter) of 135 to 200 ° C., and the melting point difference with the PA fiber is set to 80 to 120 ° C., and the PA elastomer coating film is fused to the fabric. It is characterized by being.

本発明に係るエアバッグ用コート基布の製造方法は、下記構成となる。   The manufacturing method of the coat base fabric for airbags which concerns on this invention becomes the following structure.

本発明のエアバッグ用コート基布の製造方法であって、上記塗膜の塗料として、ポリマー粒径0.05〜5μmの水分散系の塗料を使用するとともに、該塗料を塗布後、前記ＰＡエラストマーの融点より5〜30℃高い温度で0.5〜5min加熱処理して塗膜の形成を行うことを特徴とする。   In the method for producing a coated base fabric for an airbag according to the present invention, a water-dispersed paint having a polymer particle size of 0.05 to 5 μm is used as the paint for the coating film, and after applying the paint, A coating film is formed by heat treatment at a temperature 5 to 30 ° C. higher than the melting point for 0.5 to 5 minutes.

本発明のＰＡ再生材は、本発明のエアバッグ用コート基布の廃材を破砕・溶融・ペレット化されてなることを特徴とする。   The PA recycled material of the present invention is characterized in that the waste material of the coated fabric for airbag of the present invention is crushed, melted and pelletized.

当該ＰＡ再生材は、望ましくは、成形体の機械的特性が、引張強さ（ASTM D 638）、引張伸び（同）、曲げ強さ（ASTM D 790）、曲げ弾性率（同）において、ノンコート基布の再生材の50％以上値を示すものであり、さらには、シャルピー衝撃値（JIS K 7111）において、ノンコート基布に比して35％以上（望ましくは70％以上、さらには100％以上）大きな値を示すものとする。   The PA recycled material preferably has a non-coated mechanical property of the molded body in terms of tensile strength (ASTM D 638), tensile elongation (same), bending strength (ASTM D 790), and flexural modulus (same). The value indicates 50% or more of the recycled material of the base fabric. Furthermore, in the Charpy impact value (JIS K 7111), it is 35% or more (preferably 70% or more, or even 100%) compared to the non-coated base fabric. Above) Show a large value.

そして、本発明は、本発明のエアバッグ用コート基布を用いたエアバッグ、さらには、該エアバッグを用いたエアバッグ装置にまで及ぶ。   And this invention extends to the airbag using the coat base fabric for airbags of this invention, and also the airbag apparatus using this airbag.

以下、本発明の望ましい実施形態について説明する。   Hereinafter, preferred embodiments of the present invention will be described.

本実施形態のエアバッグ用コート基布は、ポリアミド繊維糸で織成された布帛と、該布帛の少なくとも片面（片面又は両面）に形成される通気抑制塗膜とを備えてなることを前提的構成とする。   The air bag coat base fabric of the present embodiment is premised on including a fabric woven with polyamide fiber yarns and a ventilation suppression coating film formed on at least one side (one side or both sides) of the fabric. The configuration.

前記ＰＡ繊維糸のＰＡ繊維としては、例えば、ナイロン６６、ナイロン６、ナイロン４６、ナイロン１２などの脂肪族ポリアミド；アラミドなどの芳香族ポリアミド等を使用する。これらのうちで、耐熱性と汎用性の見地からナイロン６６が好ましい。その理由は、下記の如くである。   Examples of the PA fibers of the PA fiber yarn include aliphatic polyamides such as nylon 66, nylon 6, nylon 46, and nylon 12; aromatic polyamides such as aramid. Among these, nylon 66 is preferable from the viewpoint of heat resistance and versatility. The reason is as follows.

ナイロン６６（融点:250〜260℃）は、他の汎用ナイロンであるナイロン６（同215〜220℃）、ナイロン１１（同184〜194℃）、ナイロン１２（同176〜180℃）より融点が高くて熱容量も大きい。ナイロン４６（同290℃）は、融点は高いが特殊であり高コストである。芳香族ポリアミドは、機械的強度や耐熱性は高いが耐摩耗性に劣る。なお、上記ナイロンの各融点は、「高分子大辞典」（丸善出版）p987、「実用プラスチック事典」（産業調査会）p320、「化学便覧応用編 改訂3版」（丸善出版）p833からそれぞれ引用したものをまとめたものである。   Nylon 66 (melting point: 250-260 ° C) has a melting point higher than other general-purpose nylons such as nylon 6 (215-220 ° C), nylon 11 (184-194 ° C), and nylon 12 (176-180 ° C). High and large heat capacity. Nylon 46 (290 ° C.) has a high melting point but is special and expensive. Aromatic polyamide has high mechanical strength and heat resistance, but is inferior in wear resistance. Each melting point of the above nylon is quoted from "Polymer Dictionary" (Maruzen Publishing) p987, "Practical Plastics Dictionary" (Industry Research Committee) p320, "Chemical Handbook Application Edition 3rd Edition" (Maruzen Publishing) p833, respectively. It is a summary of what you did.

ＰＡ繊維糸は、ＰＡ繊維の種類により異なるが、通常、200〜700dtexの合糸を使用する。例えば、フィラメント72本合糸で470dtexとなるようなナイロン６６合糸を使用する。   Although the PA fiber yarn varies depending on the type of PA fiber, a 200 to 700 dtex composite yarn is usually used. For example, nylon 66 combined yarn is used so that 72 filaments are combined to be 470 dtex.

そして、布帛の織成の態様は、通常、平織りとするが、斜文織りや朱子織りでもよい。   The weaving mode of the fabric is usually a plain weave, but it may be an oblique weave or a satin weave.

また、布帛の下記式で示されるカバーファクター（K）は、1200〜2400、望ましくは1400〜2100、更に望ましくは1600〜2000、最も望ましくは1800〜2000とする。カバーファクターの低い、即ち、通気度の低い布帛を用いることにより、本発明の効果、軽量、低コスト化が可能となる。カバーファクターが低すぎると、所定の機械的強度を得難くなることに加えて、布帛の織り目間に溶融樹脂が貫通流入してコート基布の気密度乃至柔軟性を確保し難くなる。   Further, the cover factor (K) represented by the following formula of the fabric is 1200 to 2400, desirably 1400 to 2100, more desirably 1600 to 2000, and most desirably 1800 to 2000. By using a fabric having a low cover factor, that is, a low air permeability, the effect, light weight, and cost reduction of the present invention can be achieved. If the cover factor is too low, it becomes difficult to obtain a predetermined mechanical strength, and in addition, it becomes difficult to ensure the air density or flexibility of the coated base fabric due to the molten resin penetrating and flowing between the fabric textures.

Ｋ＝ＮＷ × ＤＷ0.5 ＋ ＮＦ × ＤＦ0.5
但し、ＮＷ：経糸密度（本／in）、ＤＷ：経糸繊度（デニール）
ＮＦ：緯糸密度（本／in）、ＤＦ：緯糸繊度（デニール）
カバーファクター（Ｋ）が、低すぎる又は高すぎるということは、経・緯糸密度及び／又は経・緯繊度が相対的に低いこと又は高いことを意味する。 K = NW x DW 0.5 + NF x DF 0.5
However, NW: Warp density (lines / in), DW: Warp fineness (denier)
NF: Weft density (main / in), DF: Weft fineness (denier)
That the cover factor (K) is too low or too high means that the warp / weft density and / or the warp / weft fineness is relatively low or high.

糸密度及び／又は繊度が低いと、布帛に所定の機械的強度を得難く、さらに、糸密度が低い場合、糸ずれが発生して織り目形態が崩れるおそれがある。   When the yarn density and / or fineness is low, it is difficult to obtain a predetermined mechanical strength for the fabric. Furthermore, when the yarn density is low, there is a possibility that the yarn form may be lost and the texture form may be lost.

糸密度及び／又は繊度が高いと、布帛の剛性が所定値内に収まり難く、さらに、糸密度が高い場合布帛が厚くなって、エアバッグの折畳み性・収納性に問題が生じ易くなる。   If the yarn density and / or fineness is high, the stiffness of the fabric is difficult to be within a predetermined value, and if the yarn density is high, the fabric becomes thick and problems with the folding and storing properties of the airbag are likely to occur.

そして、図１ではＰＡ繊維糸（経・緯糸）１２、１２Ａで形成された布帛１４の片面にＰＡエラストマーの塗膜１６が形成されている。前述の如く、該塗膜は、両面に形成されていてもよい。   In FIG. 1, a PA elastomer coating film 16 is formed on one side of a fabric 14 formed of PA fiber yarns (warp / weft) 12 and 12A. As described above, the coating film may be formed on both sides.

そして、本発明においては、コート基布の柔軟性確保の見地から、図示の如く、塗膜１６が可及的に薄層で、布帛表面における織り目間隙の片面凹部にＰＡエラストマー（樹脂）が部分浸入したマクロ構造を有することが望ましい。   In the present invention, from the viewpoint of ensuring the flexibility of the coated base fabric, as shown in the figure, the coating film 16 is as thin as possible, and the PA elastomer (resin) is partially formed in the concave portion on one side of the weave gap on the fabric surface. It is desirable to have an intruded macrostructure.

そして、ＰＡエラストマーは、基布の種類により異なるが、例えば、基布（ＰＡ繊維）がナイロン６６（融点：250〜260℃）の場合、下記特性を有するブロック共重合タイプの熱可塑性エラストマー（ＴＰＥ）を好適に使用できる。   The PA elastomer varies depending on the type of the base fabric. For example, when the base fabric (PA fiber) is nylon 66 (melting point: 250 to 260 ° C.), a block copolymer type thermoplastic elastomer (TPE) having the following characteristics is used. ) Can be suitably used.

１）融点：135〜200℃、望ましくは140〜180℃、さらに望ましくは155〜165℃とする。   1) Melting point: 135 to 200 ° C, desirably 140 to 180 ° C, more desirably 155 to 165 ° C.

そして、ＰＡ繊維との融点差は80〜120℃、望ましくは80〜110℃、さらに望ましくは85〜105℃とする。   The difference in melting point with the PA fiber is 80 to 120 ° C, preferably 80 to 110 ° C, more preferably 85 to 105 ° C.

ＰＡエラストマーの融点が高いと、エラストマーの相対的な結晶率の上昇に伴う剛性増大により、コート基布に柔軟性を確保し難くなる。すなわち、バッグの折畳みが困難となるとともにバッグ展開時の要求展開性能（バッグ内へのガス流入に伴う、スムーズな展開性）を確保し難くなる。逆にＰＡエラストマーの融点が低すぎると、即ち、車両使用環境上限温度（通常、105℃）に近いと、塗膜自体の形態が崩れて気密度（低通気量）を確保し難くなり、さらには、布帛（基布）を構成するＰＡとの融点差が大きくなり易く、再生材料の品質を確保し難くなる。   When the melting point of the PA elastomer is high, it becomes difficult to ensure flexibility in the coated base fabric due to an increase in rigidity accompanying an increase in the relative crystallinity of the elastomer. That is, it becomes difficult to fold the bag, and it is difficult to ensure the required deployment performance (smooth deployability accompanying gas inflow into the bag) when the bag is deployed. Conversely, if the melting point of the PA elastomer is too low, that is, if it is close to the vehicle use environment upper limit temperature (usually 105 ° C.), the form of the coating film itself will collapse and it will be difficult to ensure the air density (low air flow rate). Is likely to have a large melting point difference from PA constituting the fabric (base fabric), and it becomes difficult to ensure the quality of the recycled material.

２）引張伸び（引張破断伸度）（ASTM D638。以下同じ）：200％以上とする。引張伸びが低すぎると、コート基布に柔軟性を確保し難くなるとともに、バッグ展開時の応力で、エラストマー塗膜に亀裂が発生して、所定気密性を確保し難くなるおそれがある。   2) Tensile elongation (tensile elongation at break) (ASTM D638, the same shall apply hereinafter): 200% or more. If the tensile elongation is too low, it is difficult to ensure flexibility in the coated base fabric, and cracks may occur in the elastomer coating film due to stress during bag deployment, making it difficult to ensure the predetermined airtightness.

３）曲げ弾性率（ASTM D790）：200MPa以下とする。曲げ弾性率が高すぎると、コート基布に柔軟性を確保し難くなる。曲げ弾性率は低い方が望ましいが、通常、下限は50MPaとする。   3) Flexural modulus (ASTM D790): 200 MPa or less. If the flexural modulus is too high, it will be difficult to ensure flexibility in the coated base fabric. A lower flexural modulus is desirable, but usually the lower limit is 50 MPa.

４）平衡吸水率（ASTM D790；20℃×65％Ｒ）：3％以下、望ましくは2％以下とする。   4) Equilibrium water absorption (ASTM D790; 20 ° C x 65% R): 3% or less, preferably 2% or less.

平衡吸水率が高すぎると、塗膜が水分を吸収して塗膜剥がれが発生するおそれがある。   If the equilibrium water absorption is too high, the coating film may absorb moisture and peeling of the coating film may occur.

本発明者らは、ナイロンエラストマーが、ナイロン６６繊維の平衡吸水率（3.3〜4.5%）と同じか若干低めの場合に、塗膜密着性の観点から有利であることを確認している。   The present inventors have confirmed that the nylon elastomer is advantageous from the viewpoint of coating film adhesion when it is the same as or slightly lower than the equilibrium water absorption (3.3 to 4.5%) of the nylon 66 fiber.

なお、前記の如く「トレジン」は、セルロースに近い水蒸気透過性を有し、平衡吸水率は、ナイロン６，６よりはるかに高いものと推定される。   As mentioned above, “Tresin” has water vapor permeability close to that of cellulose, and the equilibrium water absorption is estimated to be much higher than that of nylon 6 and 6.

５）環境負荷物質を含まない。例えば、「トレジン」（Ｎ−メトキシメチル化ナイロン）の場合、残留ホルマリンを含有する。リサイクルの見地から環境負荷物質を含まないものが望ましい。   5) Does not contain environmentally hazardous substances. For example, “Tresin” (N-methoxymethylated nylon) contains residual formalin. From the viewpoint of recycling, those that do not contain environmentally hazardous substances are desirable.

そして、ＰＡエラストマーの種類は、上記特性１）さらには２）〜５）を満たすものなら特に限定されず、下記各種タイプのものを使用可能である。これらのうちで、ブロック共重合タイプが、本発明に要求される融点（耐熱性）とともに柔軟性（引張伸び、曲げ弾性率）を得やすくて、好ましい。   The type of PA elastomer is not particularly limited as long as it satisfies the above characteristics 1) and 2) to 5), and the following various types can be used. Among these, the block copolymer type is preferable because flexibility (tensile elongation, flexural modulus) can be easily obtained together with the melting point (heat resistance) required for the present invention.

１）ブロック共重合タイプ：ＰＡブロックをハードセグメントとし、ポリエーテル（ＰＥ）ブロックをソフトセグメントとする下記構造式で示されるＰＥＢＡ（ポリエーテルブロックポリアミド）を好適に使用できる。ここで、ＰＡとしては、ナイロン６、ナイロン６６、ナイロン１１、ナイロン１２等を使用できるが、ナイロン１１又はナイロン１２が好ましく、ナイロン１２がさらに好ましい。ナイロン１２は、ポリアミド中でポリメチレン鎖が長くアミド結合密度が低い。したがって、ＰＡ中、一番柔らかく、且つ、耐衝撃性及び低温特性等にも優れている。   1) Block copolymerization type: PEBA (polyether block polyamide) represented by the following structural formula having a PA block as a hard segment and a polyether (PE) block as a soft segment can be suitably used. Here, nylon 6, nylon 66, nylon 11, nylon 12, etc. can be used as PA, but nylon 11 or nylon 12 is preferable, and nylon 12 is more preferable. Nylon 12 has a long polymethylene chain in polyamide and a low amide bond density. Therefore, it is the softest in PA and has excellent impact resistance and low temperature characteristics.

Figure 2009097134
ポリエーテルとしては、ポリテトラメチレンエーテルグリコール、ポリプロピレングリコール等を挙げることができる。ソフトセグメントを、脂肪族ポリエステルジオール等のポリエステルブロックとしてもよい。
Figure 2009097134
 Examples of the polyether include polytetramethylene ether glycol and polypropylene glycol. The soft segment may be a polyester block such as an aliphatic polyester diol.

２）結晶性低下タイプ：ナイロン分子鎖に官能基(例えば、アルコキシアルキル基)をグラフト重合し、分子同士の距離を離間させて分子間引力を低減させ、結晶性を低下させた
ものである。 2) Crystallinity-reducing type: A functional group (for example, an alkoxyalkyl group) is graft-polymerized on a nylon molecular chain, and the intermolecular attractive force is reduced by separating the distance between molecules, thereby reducing the crystallinity.

３）ポリマーアロイタイプ：ＰＡ樹脂中にＥＰＤＭ等のゴム微粒子を分散させて海島構造としたものである。   3) Polymer alloy type: A rubber island such as EPDM is dispersed in a PA resin to form a sea-island structure.

４）可塑剤タイプ：ＰＡに可塑剤を添加し軟質化させたものである。可塑剤としては、ブチルベンゼンスルホン酸アミド、Ｎ−アルキルトルエンスルホン酸アミド、ヘキシレングリコール、ｐ−オキシ安息香酸エステル−２等を挙げることができる。   4) Plasticizer type: A plasticizer added to PA to be softened. Examples of the plasticizer include butylbenzenesulfonic acid amide, N-alkyltoluenesulfonic acid amide, hexylene glycol, and p-oxybenzoic acid ester-2.

上記ＰＡエラストマーは、分散液（エマルション）又は溶液として、布帛に塗布をする。   The PA elastomer is applied to the fabric as a dispersion (emulsion) or a solution.

エマルションに分散させるＰＡエラストマーの粒径は、通常、0.05〜5μm、望ましくは0.2〜5μm、さらに望ましくは0.2〜1μmの範囲から適宜選定する。   The particle size of the PA elastomer dispersed in the emulsion is usually appropriately selected from the range of 0.05 to 5 μm, desirably 0.2 to 5 μm, and more desirably 0.2 to 1 μm.

そして、エマルション化の態様としては、下記の慣用の方法を挙げることができる。   And as an aspect of emulsification, the following conventional method can be mentioned.

１）溶媒置換法：ポリマーを溶媒に溶解後、乳化剤と水を添加し転相（溶媒は回収）。   1) Solvent replacement method: After dissolving a polymer in a solvent, an emulsifier and water are added to perform phase inversion (the solvent is recovered).

２）加圧法：ポリマー、乳化剤、水を容器中にて高温・高圧下で攪拌し乳化。   2) Pressurization method: Polymer, emulsifier and water are stirred and emulsified in a container at high temperature and high pressure.

３）機械乳化法：２軸エクストルーダー（押出機）を用い、機械的せん断力で乳化。   3) Mechanical emulsification method: emulsification by mechanical shearing force using a twin screw extruder (extruder).

溶液とする場合は、例えば、シクロヘキサノン、クレゾール等を使用する。   In the case of a solution, for example, cyclohexanone, cresol or the like is used.

上記ＰＡのエマルション又は溶液を用いて行う塗布方法としては、片面塗布とする場合は、例えば、ナイフコート（ダイコート）、ローラコート（ナショナル、リバース）、刷毛コート、スプレーコートとする。これらの内で、ナイフコートが、望ましい。合糸に対して表層含浸させ、かつ、布帛の織り目間隙の片面凹部ＳへＰＡを浸入させた状態で、布帛の片面に薄層のエラストマー塗膜を形成し易いためである。結果的に、コート基布の柔軟性を確保し易い。   As a coating method performed using the above emulsion or solution of PA, for example, knife coating (die coating), roller coating (national, reverse), brush coating, and spray coating are used for single-side coating. Of these, a knife coat is desirable. This is because it is easy to form a thin elastomer coating film on one side of the fabric in a state where the surface yarn is impregnated into the combined yarn and PA is infiltrated into the single-sided concave portion S of the fabric gap. As a result, it is easy to ensure the flexibility of the coated base fabric.

なお、両面塗布とする場合は、例えば、ディッピング（浸漬塗り）とする。   In addition, when it is set as double-sided coating, it is set as dipping (dip coating), for example.

このときの塗布量（乾量基準）は、エアバッグに要求される通気量及び柔軟性（折り畳み性）のバランスから、3〜100ｇｍ-2、望ましくは5〜25ｇｍ-2、さらに望ましくは5〜15ｇｍ-2、の範囲から適宜選定する。 The coating amount of this time (dry basis) from the balance of the airflow amount and flexibility required to the air bag (foldability), 3～100Gm -2, preferably 5～25Gm -2, more preferably 5 to Select from the range of 15gm- 2 .

そして、塗布後、通常、ＰＡ塗膜の布帛に対して密着（融着）させるために加熱処理（融着処理）をする。このときの加熱処理条件は、ＰＡ塗膜が、合糸に対して表層融着状態で、且つ、布帛の織り目間隙における片面凹部Ｓに連続する縊れ部（隘路：最少隙間部）を通過しないものとする（部分侵入のマクロ構造を有する）ことが望ましい。コート基布の柔軟性を維持（確保）するためである。合糸の内部までＰＡが含浸状態となったり、及び／又は、織り目隙間の縊れ部を通過して裏面にも塗膜が形成されたりすると、コート基布の剛性が高くなり柔軟性を確保し難くなる。   And after application | coating, in order to make it adhere | attach (fusing) normally to the fabric of PA coating film, it heat-processes (fusion process). The heat treatment conditions at this time are such that the PA coating film is in a surface layer fusion state with respect to the combined yarn and does not pass through a wrinkle portion (bottleway: minimum gap portion) continuous to the single-sided concave portion S in the fabric weave gap. It is desirable (having a partial intrusion macrostructure). This is to maintain (secure) the flexibility of the coat base fabric. If the PA is impregnated to the inside of the combined yarn and / or if a coating film is formed on the back side through the creased portion of the weave gap, the coated base fabric becomes more rigid and secures flexibility. It becomes difficult to do.

加熱処理の条件は、塗膜形成ＰＡ（エラストマー）の融点より5〜30℃（望ましくは10〜20℃）高く、且つ、布帛形成ＰＡ（繊維）の融点より30℃以上（望ましくは50℃以上）低い温度で、0.5〜10min（望ましくは0.5〜5min）とする。処理温度において塗膜形成ＰＡとの融点差が小さいと、塗膜形成ＰＡを十分に流動化させ難く、布帛に対する濡れ性を得難く必要な密着性(融着性)を得られない。逆に、処理温度が塗膜形成ＰＡとの融点差が大きいと、ＰＡエラストマーの溶融流動性が増大して、カバーファクターが大きな布帛の場合、織り目隙間に浸入（浸透）しやすく、コート基布の柔軟性を阻害するおそれがある。すなわち、布帛形成ＰＡ繊維の融点より30℃以上（望ましくは50℃以上）低い温度差とすることが困難となってくる。   The heat treatment conditions are 5 to 30 ° C. (preferably 10 to 20 ° C.) higher than the melting point of the film-forming PA (elastomer), and 30 ° C. or higher (preferably 50 ° C. or higher) than the melting point of the fabric-forming PA (fiber). ) At low temperature, set to 0.5 to 10 min (preferably 0.5 to 5 min). If the melting point difference with the coating film-forming PA is small at the treatment temperature, it is difficult to sufficiently fluidize the coating film-forming PA, it is difficult to obtain wettability with respect to the fabric, and the necessary adhesion (fusing property) cannot be obtained. On the contrary, if the treatment temperature has a large melting point difference from the coating film-formed PA, the melt fluidity of the PA elastomer increases, and in the case of a fabric having a large cover factor, it is easy to enter (penetrate) into the texture gap, and the coated base fabric There is a risk of hindering the flexibility. That is, it becomes difficult to make the temperature difference 30 ° C. or higher (preferably 50 ° C. or higher) lower than the melting point of the fabric-forming PA fiber.

こうしてコート基布を製造することにより、後述の実施例で示す如く、通気量（高圧通気度測定器20KPa）0.4 Lcm-2min-1以下、望ましくは0.2 Lcm-2min-1以下であり、反発弾性（ASTM D 726;ガーレー試験機）120g以下、望ましくは80ｇ以下のものを容易に得ることができる。 By producing the coated base fabric in this way, as shown in the examples described later, the air flow rate (high pressure air permeability measuring device 20 KPa) is 0.4 Lcm -2 min -1 or less, preferably 0.2 Lcm -2 min -1 or less, Rebound resilience (ASTM D 726; Gurley tester) of 120 g or less, desirably 80 g or less can be easily obtained.

以下、本発明の効果を裏付けるために対照例・従来例とともに行った実施例について説明をする。   Hereinafter, in order to support the effect of the present invention, examples carried out together with the comparative example and the conventional example will be described.

なお、使用したＰＡエラストマーは、下記特性を有するＰＥＢＡの上市品を使用した。   The PA elastomer used was a commercial product of PEBA having the following characteristics.

１）融点（ASTM D3418）：160℃、
２）引張伸び（ASTM D638）：450％
３）曲げ弾性率（ASTM D790 （ISO 178））：84MPa
４）平衡吸水率（ASTM D570；20℃×65％ＲＨ）：0.5％
５）吸水率（ASTM D570；20℃、水中、24ｈ）：1.2％
各実施例・比較例の試料は、下記仕様のノンコート基布（布帛）に下記各条件で塗布・加熱処理を行って調製した（表１参照）。なお、塗布量は、いずれも乾量基準である。 1) Melting point (ASTM D3418): 160 ° C
2) Tensile elongation (ASTM D638): 450%
3) Flexural modulus (ASTM D790 (ISO 178)): 84MPa
4) Equilibrium water absorption (ASTM D570; 20 ° C x 65% RH): 0.5%
5) Water absorption rate (ASTM D570; 20 ° C, underwater, 24 hours): 1.2%
Samples of Examples and Comparative Examples were prepared by applying and heat-treating non-coated base fabric (fabric) having the following specifications under the following conditions (see Table 1). In addition, all application amounts are on a dry basis.

Figure 2009097134
(1)エアバッグ用基布
対照例：ノンコート・・・350dtex（315デニール）のナイロン６６合糸で平織（経糸：59本／in、緯糸：59本／in）、カバーファクター（Ｋ）＝59×（315）0.5＋59×（315）0.5＝2094
実施例１：ＰＥＢＡコート・・・下記被処理布帛（ノンコート）に塗布（ナイフコート）後、175℃×2minの条件で塗膜樹脂を加熱処理（加熱融着）し、塗布量12ｇｍ-2のコート基布を調製した。
Figure 2009097134
 (1) Airbag base fabric Contrast example: Non-coated · 350dtex (315 denier) nylon 66 synthetic yarn, plain weave (warp: 59 / in, weft: 59 / in), cover factor (K) = 59 × (315) 0.5 +59 × (315) 0.5 = 2094
Example 1: PEBA coating: After coating (knife coating) on the following treated fabric (non-coated), the coating resin was heat-treated (heat fusion) at 175 ° C. × 2 min, and the coating amount was 12 gm −2 . A coated base fabric was prepared.

470dtex（423デニール）のナイロン６６合糸で平織（経糸：46本／in、緯糸：46本／in）、カバーファクター（Ｋ）＝46×（423）0.5＋46×（423）0.5＝1892
比較例１：ＰＥＢＡコート・・・実施例１において、加熱処理条件を90℃×15minとして加熱処理（乾燥）した以外は、同様にして、コート基布（塗布量：7ｇｍ-2）を調製した。 470dtex (423 denier) nylon 66 synthetic yarn with plain weave (warp: 46 / in, weft: 46 / in), cover factor (K) = 46 x (423) 0.5 + 46 x (423) 0.5 = 1892
Comparative Example 1: PEBA coating: A coated base fabric (coating amount: 7 gm −2 ) was prepared in the same manner as in Example 1, except that the heat treatment conditions were 90 ° C. × 15 min. .

実施例２：ＰＥＢＡコート・・・実施例１で用いた被処理布帛に塗布（ディッピング）後、175℃×2minの条件で加熱溶融成膜（乾燥）させ、コート基布（塗布量：7ｇｍ-2）を調製した。 Example 2: PEBA coating: After coating (dipping) on the treated fabric used in Example 1, the film was heated and melted (dried) under the condition of 175 ° C. × 2 min to form a coated base fabric (coating amount: 7 gm −). 2 ) was prepared.

実施例３：ＰＥＢＡコート・・・実施例１で用いた被処理布帛に塗布（ディッピング）後、175℃×2minの条件で乾燥させ、コート基布（塗布量：20ｇｍ-2）を調製した。 Example 3: PEBA coat: After coating (dipping) on the treated fabric used in Example 1, it was dried at 175 ° C. for 2 minutes to prepare a coated base fabric (coating amount: 20 gm −2 ).

従来例：シリコーンゴムコート・・・上記ノンコート布帛にシリコーンゴムをナイフコートして、加硫硬化させた塗布した出願人の製造していた従来品（塗布量：22ｇｍ-2）。 Conventional example: Silicone rubber coat: A conventional product manufactured by the applicant who applied the above-mentioned non-coated fabric by knife coating silicone rubber and vulcanized and cured (application amount: 22 gm −2 ).

上記で調製した各試料について、下記各項目の試験をそれぞれの試験法に従って行った。なお、反発弾性における比較例は、市販のナイロンエマルション液を塗布したものである。   About each sample prepared above, the test of each following item was done according to each test method. In addition, the comparative example in impact resilience applies a commercially available nylon emulsion liquid.

１）通気量：コスモ計器株式会社製「高圧通気度測定機」を用い、圧力を10〜50kPaの間で、10kPaピッチで増大させて測定した。以下、通気量の後の括弧内は、高圧通気度測定機による加圧度を示す。     1) Aeration rate: Measured by using a “high pressure permeability measuring device” manufactured by Cosmo Keiki Co., Ltd., increasing the pressure between 10 and 50 kPa at a 10 kPa pitch. Hereinafter, the parenthesis after the air flow rate indicates the degree of pressurization by the high pressure air permeability measuring machine.

２）反発弾性：ASTM D 726（JIS L 1096）
上記１）、２）の試験結果を、表２及び図２・３に示す。 2) Rebound resilience: ASTM D 726 (JIS L 1096)
The test results of 1) and 2) are shown in Table 2 and FIGS.

Figure 2009097134
本発明の各実施例は、従来例のシリコーンゴムコート基布より若干劣るが、気密度及び柔軟性において実用化可能な気密度（通気量）及び柔軟性（反発弾性）を示すことが確認できた。ここで実用化可能とは、通気量（20Kpa）0.4Lcm-2min-1以下、望ましくは0.2Lcm-2min-1以下で柔軟性（反発弾性）120ｇ以下、望ましくは80ｇ以下とする。さらに望ましくは、エアバッグ作動時に最大内圧を想定して、通気量（50Kpa）で、0.50Lcm-2min-1以下、最も望ましくは0.10Lcm-2min-1以下とする。各実施例は、望ましい乃至最も望ましい特性を満足する。
Figure 2009097134
 Each example of the present invention is slightly inferior to the silicone rubber coated base fabric of the conventional example, but it can be confirmed that air density (aeration amount) and flexibility (rebound resilience) that can be put into practical use in air density and flexibility are shown. It was. Here, “practical use” means that the air flow rate (20 Kpa) is 0.4 Lcm −2 min −1 or less, preferably 0.2 Lcm −2 min −1 or less and flexibility (rebound resilience) is 120 g or less, preferably 80 g or less. More desirably, assuming the maximum internal pressure when the airbag is activated, the air flow rate (50 Kpa) is 0.50 Lcm −2 min −1 or less, and most desirably 0.10 Lcm −2 min −1 or less. Each embodiment satisfies desirable or most desirable characteristics.

また、比較例１は反発弾性が52ｇと、柔軟性は実施例２の反発弾性88ｇより低く柔軟であるが、気密度（20kPa）0.5Lcm-2min-1であり、実用化可能な最低限の気密度、通気量（20kPa）0.4Lcm-2min-1以下を確保し難いことが確認できた。 The comparative example 1 has a rebound resilience of 52 g, and the flexibility is lower than the rebound resilience 88 g of the example 2 and is flexible, but the airtightness (20 kPa) is 0.5 Lcm −2 min −1, which is the lowest practically possible It was confirmed that it was difficult to secure an air density and air flow rate (20 kPa) of 0.4 Lcm -2 min -1 or less.

また、反発弾性において、片面コート（ナイフコート）である塗布量の少ない実施例１・３の方が、塗布量の多い両面コート（ディッピング）の実施例２より小さい。即ち、ディッピングの場合、布帛織り目隙間へのＰＡエラストマー（樹脂）の浸入量が多く、結果として、少ない塗布量でも、基布の剛性が高くなるのに対し、ナイフコートでは布帛織り目隙間へのＰＡエラストマー（樹脂）の浸入が抑制されて、コート基布の柔軟性が確保し易いことが確認できた。   In terms of impact resilience, Examples 1 and 3 with a small amount of coating, which is a single-sided coating (knife coating), are smaller than those of Example 2 with a large coating amount of double-sided coating (dipping). That is, in the case of dipping, the amount of PA elastomer (resin) invading into the fabric weave gap is large, and as a result, even with a small amount of application, the rigidity of the base fabric is increased. It was confirmed that the intrusion of the elastomer (resin) was suppressed and it was easy to ensure the flexibility of the coated base fabric.

さらに、上記で調製した実施例１（ＰＡコート）及び対照例（ノンコート）の各基布を破砕機・ペレタイザー（呼び径：46ｍｍ）を備えた出願人のノンコート基布再生設備を用いてペレタイザー運転条件：280℃×180rpmで、ＰＡ再生材（ペレット）を調製した。   Further, each of the base fabrics of Example 1 (PA coat) and the control example (non-coat) prepared above was operated by a pelletizer using the applicant's non-coat base fabric regeneration facility equipped with a crusher and a pelletizer (nominal diameter: 46 mm). Conditions: PA recycled material (pellets) was prepared at 280 ° C. × 180 rpm.

そして、各ＰＡ再生材（ペレット）を、射出成形機（シリンダー内温度：270℃）で溶融したものを、室温に保持した成形型に充填・冷却固化して、各試料を調製した。   Then, each PA recycled material (pellet) melted with an injection molding machine (in-cylinder temperature: 270 ° C.) was filled into a mold held at room temperature and solidified by cooling to prepare each sample.

そして、各試料について、下記各項目の機械的特性の試験を行った。   And about each sample, the test of the mechanical characteristic of each following item was done.

ａ）引張強さ、引張伸び：ASTM D638
ｂ）曲げ弾性率：ISO 178
ｃ）曲げ強さ：ASTM D 790
ｄ）シャルピー衝撃値：JIS K 7111
それらの試験結果を、図５・６に示す。引張強さ、引張伸び、曲げ強さ及び曲げ弾性率において、ノンコート基布の再生材のそれらの値に比して50％以上の値を示すことが確認できた。すなわち、引張強さ：70％、引張伸び：100％、曲げ強さ：60％、曲げ弾性率：57％であった。また、シャルピー衝撃値において、ノンコート基布の2.475倍（247.5％）と、十分に望ましい100％以上大きな値を示すことが確認できた。 a) Tensile strength, tensile elongation: ASTM D638
b) Flexural modulus: ISO 178
c) Bending strength: ASTM D 790
d) Charpy impact value: JIS K 7111
The test results are shown in FIGS. It was confirmed that the tensile strength, tensile elongation, bending strength, and flexural modulus showed values of 50% or more compared to those of the non-coated base fabric recycled material. That is, the tensile strength was 70%, the tensile elongation was 100%, the flexural strength was 60%, and the flexural modulus was 57%. In addition, it was confirmed that the Charpy impact value was 2.475 times (247.5%) that of the non-coated base fabric and a sufficiently desirable value of 100% or more.

本発明におけるコート基布のモデル断面図である。It is model sectional drawing of the coat base fabric in this invention. 実施例１、比較例１、従来例、対照例のコート乃至ノンコート基布における通気量の試験結果を示す通気量／圧力関係図である。It is an air flow / pressure relationship diagram showing the test results of air flow in coated or non-coated base fabrics of Example 1, Comparative Example 1, Conventional Example, and Control Example. 実施例２・３、従来例、対照例のコート乃至ノンコート基布における通気量の試験結果を示す通気量／圧力関係図である。It is an air flow / pressure relationship diagram showing the test results of air flow in the coated or non-coated base fabrics of Examples 2 and 3, the conventional example, and the control example. 同じく反発弾性の試験結果を示すヒストグラムである。It is a histogram which similarly shows the test result of impact resilience. コート基布等の再生材の引張強さ・引張伸び・曲げ強さの各試験結果を示すヒストグラムである。It is a histogram which shows each test result of tensile strength, tensile elongation, and bending strength of recycled materials, such as a coat base fabric. 同じく曲げ弾性率・シャルピー衝撃値の各試験結果を示すヒストグラムである。It is a histogram which similarly shows each test result of a bending elastic modulus and a Charpy impact value.

符号の説明Explanation of symbols

１２、１２Ａ・・・ＰＡ繊維糸
１４・・・布帛
１６・・・ＰＡエラストマー塗膜 12, 12A ... PA fiber yarn 14 ... Fabric 16 ... PA elastomer coating

Claims (12)

ポリアミド（ＰＡ）繊維の糸で織成された布帛の少なくとも片面にＰＡエラストマーの塗膜が形成されてなるエアバッグ用のコート基布において、
前記ＰＡエラストマーが、融点（ASTM D3418。以下同じ。）135〜200℃を示すものであり、且つ、前記ＰＡ繊維との融点差が80〜120℃とされて、前記塗膜が布帛に融着形成されていることを特徴とするエアバッグ用コート基布。 In a coated base fabric for an air bag in which a coating film of PA elastomer is formed on at least one side of a fabric woven with polyamide (PA) fiber yarns,
The PA elastomer has a melting point (ASTM D3418; the same shall apply hereinafter) of 135 to 200 ° C., and the melting point difference with the PA fiber is 80 to 120 ° C., so that the coating film is fused to the fabric. A coated base fabric for an airbag characterized by being formed. 前記塗膜は、布帛表面における織り目間隙の片面凹部に前記ＰＡエラストマー（樹脂）が部分浸入したマクロ構造を有するものであることを特徴とする請求項１記載のエアバッグ用コート基布。   2. The coated base fabric for an air bag according to claim 1, wherein the coating film has a macro structure in which the PA elastomer (resin) is partially infiltrated into a single-sided concave portion of a weave gap on the fabric surface. 前記塗膜が、カバーファクターが1200〜2400である前記布帛の片面に塗布量5〜25ｇｍ-2で形成されたものであることを特徴とする請求項１記載のエアバッグ用コート基布。 2. The coated base fabric for an air bag according to claim 1, wherein the coating film is formed on one side of the fabric having a cover factor of 1200 to 2400 at a coating amount of 5 to 25 gm <-2 >. 前記塗膜が前記布帛の片面に形成されるとともに、前記コート基布の特性が、反発弾性（ASTM D 726;ガーレー試験機、以下同じ）120ｇ以下、コート基布の通気量（高圧通気度測定機による20KPa下。以下同じ。）0.4Lcm-2min-1以下を示すことを特徴とする請求項３記載のエアバッグ用コート基布。 The coating film is formed on one side of the fabric, and the properties of the coated base fabric are rebound resilience (ASTM D 726; Gurley tester, the same applies hereinafter) 120 g or less, the air flow rate of the coated base fabric (measurement of high-pressure air permeability) 4. The coated base fabric for an air bag according to claim 3, which shows 0.4 Lcm -2 min -1 or less under 20 KPa by a machine. 前記ＰＡエラストマーがブロック共重合タイプであるとともに、前記コート基布の特性が、反発弾性：80ｇ以下、コート基布の通気量：0.2 Lcm-2min-1以下を示すことを特徴とする請求項４記載のエアバッグ用コート基布。 The PA elastomer is of a block copolymer type, and the properties of the coated base fabric exhibit rebound resilience: 80 g or less, and the air permeability of the coated base fabric: 0.2 Lcm -2 min -1 or less. 4. Coated base fabric for airbag according to 4. 前記ＰＡ繊維がナイロン６６であり、前記ＰＡエラストマーが、融点：140〜180℃の範囲にあり、ハードセグメント（ポリアミド）をナイロン１２又はナイロン１１とし、ソフトセグメントをポリエーテルブロックとするブロック共重合体であることを特徴とする請求項５記載のエアバッグ用コート基布。   A block copolymer in which the PA fiber is nylon 66, the PA elastomer has a melting point of 140 to 180 ° C., the hard segment (polyamide) is nylon 12 or nylon 11, and the soft segment is a polyether block. The coated base fabric for an air bag according to claim 5, wherein 請求項１〜６のいずれか一記載のエアバッグ用コート基布の製造方法であって、前記塗膜の塗料として、ポリマー粒径0.05〜5μmの水分散系の塗料を使用するとともに、該塗料を塗布後、前記ＰＡエラストマーの融点より5〜30℃高い温度で0.5〜5min加熱処理して前記塗膜の形成を行うことを特徴とするエアバッグ用コート基布の製造方法。   It is a manufacturing method of the coat base fabric for airbags as described in any one of Claims 1-6, Comprising: While using the coating material of the polymer particle diameter of 0.05-5 micrometers as a coating material of the said coating film, this coating material A method for producing a coated base fabric for an air bag is characterized in that, after coating, the coating film is formed by heat treatment at a temperature 5 to 30 ° C. higher than the melting point of the PA elastomer for 0.5 to 5 minutes. 請求項１〜６のいずれか一記載のエアバッグ用コート基布の廃材が破砕・溶融・ペレット化されてなることを特徴とするＰＡ再生材。   A PA recycled material obtained by crushing, melting, and pelletizing the waste material of the airbag coating base fabric according to any one of claims 1 to 6. 前記ＰＡ再生材であって、成形体の機械的特性が、引張強度（ASTM D 638）、引張伸び（同）、曲げ強度（ASTM D 790）、曲げ弾性率（同）において、ノンコート基布の再生材の50％以上の値を示すものであることを特徴とする請求項８記載のＰＡ再生材。   In the PA recycled material, the mechanical properties of the molded body are tensile strength (ASTM D 638), tensile elongation (same as above), bending strength (ASTM D 790), and flexural modulus (same as above). The PA recycled material according to claim 8, which exhibits a value of 50% or more of the recycled material. 前記エアバッグ用コート基布の再生材のシャルピー衝撃値（JIS K 7111）において、ノンコート基布の再生材に比して35％以上大きな値を示すことを特徴とする請求項９記載のＰＡ再生材。   10. The PA regeneration according to claim 9, wherein the Charpy impact value (JIS K 7111) of the recycled material of the coated base fabric for airbags is 35% or more larger than that of the recycled material of the non-coated base fabric. Wood. 請求項１〜６のいずれか一記載のエアバッグ用コート基布を用いたものであることを特徴とするエアバッグ。   An airbag using the coat base fabric for an airbag according to any one of claims 1 to 6. 請求項１１に記載のエアバッグを用いたものであることを特徴とするエアバッグ装置。   An airbag device using the airbag according to claim 11.
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JP2013539491A (en) * 2010-08-26 2013-10-24 ロディア オペレーションズ Recycling use of polyamide airbag
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WO2013047652A1 (en) * 2011-09-28 2013-04-04 豊田合成株式会社 Coating material for airbag base fabric, and airbag base fabric
US9863088B2 (en) 2013-09-27 2018-01-09 Toyoda Gosei Co., Ltd. Airbag base fabric coating material, airbag base fabric, and method for manufacturing the same
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