JPH07126972A - Nonwoven fabric for filter cloth - Google Patents
Nonwoven fabric for filter clothInfo
- Publication number
- JPH07126972A JPH07126972A JP27454493A JP27454493A JPH07126972A JP H07126972 A JPH07126972 A JP H07126972A JP 27454493 A JP27454493 A JP 27454493A JP 27454493 A JP27454493 A JP 27454493A JP H07126972 A JPH07126972 A JP H07126972A
- Authority
- JP
- Japan
- Prior art keywords
- web
- fiber
- polyphenylene sulfide
- nonwoven fabric
- polybenzazole
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
Landscapes
- Filtering Materials (AREA)
- Laminated Bodies (AREA)
- Nonwoven Fabrics (AREA)
Abstract
Description
【０００１】[0001]
【産業上の利用分野】本発明は、たとえばポリ（パラフ
ェニレンベンツビスオキサゾール）繊維等のポリベンザ
ゾール系繊維を主たる構成繊維とする不織布に関し、よ
り詳しくは耐熱性と寸法安定性および耐薬品性を必要と
する濾過用途、特にバグフィルター用として有用な濾布
用不織布に関するものである。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a non-woven fabric containing polybenzazole fibers such as poly (paraphenylenebenzbisoxazole) fibers as a main constituent fiber, and more specifically to heat resistance, dimensional stability and chemical resistance. The present invention relates to a non-woven fabric for a filter cloth, which is useful for a filtration application, which is particularly required for a bag filter.
【０００２】[0002]
【従来の技術】産業用の濾布、例えばバグフィルターの
素材としては様々の繊維が用いられている。たとえばポ
リプロピレン繊維は、耐酸性や耐アルカリ性に優れたも
のであるが、耐熱性（連続最高使用温度）は高々１００
℃と低く、従ってこの繊維からなるバグフィルターは主
として製粉や肥料および製薬製造プラント用として使用
される。またポリエステル系繊維は、耐アルカリ性に乏
しいが、耐熱性は１３０℃と前者に比べて高くまた耐酸
性にも優れたものであるから、この繊維からなるバグフ
ィルターは、製粉や肥料および製薬用途に加えて、溶鉱
炉の砕石処理プラントやセメント製造プラント等に使用
される。2. Description of the Related Art Various fibers are used as materials for industrial filter cloths such as bag filters. For example, polypropylene fiber has excellent acid resistance and alkali resistance, but has a heat resistance (continuous maximum operating temperature) of at most 100.
As low as ℃, bag filters consisting of this fiber are mainly used for milling, fertilizers and pharmaceutical manufacturing plants. Polyester fiber has poor alkali resistance, but its heat resistance is 130 ° C, which is higher than that of the former, and it is also excellent in acid resistance. Therefore, the bag filter made of this fiber is suitable for milling, fertilizer and pharmaceutical applications. In addition, it is used for crushed stone processing plant of blast furnace and cement manufacturing plant.
【０００３】更に苛酷な高温耐熱性が要求されるバグフ
ィルター用の繊維素材としては、例えば特開昭６３−２
３５５２３号公報に開示されている様な全芳香族系ポリ
アミド繊維が提案されている。しかしながら全芳香族系
ポリアミド繊維は、前記したポリプロピレン繊維やポリ
エステル繊維に比べて耐熱性（２００℃）、引張特性、
耐アルカリ性等に優れたものであるが、耐酸性に難があ
る。従ってこの繊維を用いたバグフィルターは、主とし
てセメント、アスファルト、アルミニウム精錬、石灰焼
成炉などの用途に使用されている。As a fiber material for a bag filter which is required to have more severe high temperature heat resistance, for example, Japanese Patent Laid-Open No. 63-2 is used.
A wholly aromatic polyamide fiber as disclosed in Japanese Patent No. 35523 has been proposed. However, wholly aromatic polyamide fibers have higher heat resistance (200 ° C.), tensile properties, and
Although it has excellent alkali resistance, it has poor acid resistance. Therefore, the bag filter using this fiber is mainly used for applications such as cement, asphalt, aluminum refining, and lime baking furnace.
【０００４】その後、ポリフェニレンサルファイド繊維
が開発されるに及び、該繊維の有する優れた耐酸性、高
温耐熱性、耐燃焼性、耐酸化性等を生かし、バグフィル
ター用素材として活用する実用化研究も行なわれてい
る。例えば特開昭５７−１６９５４号公報には、ポリフ
ェニレンサルファイド繊維からなる長繊維不織布とその
製法、また特開平３−６８４０８号公報には、ポリフェ
ニレンサルファイド繊維からなる濾布用不織布が開示さ
れている。After that, as polyphenylene sulfide fiber was developed, practical use research utilizing it as a material for a bag filter by utilizing the excellent acid resistance, high temperature heat resistance, combustion resistance, oxidation resistance, etc. of the fiber was also conducted. Has been done. For example, Japanese Unexamined Patent Publication (Kokai) No. 57-16954 discloses a long fiber non-woven fabric made of polyphenylene sulfide fiber and a method for producing the same, and Japanese Unexamined Patent Publication No. 3-68408 discloses a non-woven fabric for filter cloth made of polyphenylene sulfide fiber.
【０００５】更に、近年開発されたポリベンザゾール系
繊維は格段に優れた高温耐熱性（分解開始温度：６７０
℃、尚全芳香族系ポリアミドであるデュポン社商品名
「ケブラー」の分解開始温度は４３０℃）を有している
ほか、引張特性、耐アルカリ性、耐燃焼性および高温寸
法安定性などにおいても優れたものであるところから濾
布用布帛、特にバグフィルター用布帛の素材として注目
されている。Furthermore, the polybenzazole fibers developed in recent years have remarkably excellent high temperature heat resistance (decomposition start temperature: 670).
℃, and the decomposition start temperature of DuPont's trade name “Kevlar”, which is a wholly aromatic polyamide, is 430 ° C.), and is also excellent in tensile properties, alkali resistance, combustion resistance, and high-temperature dimensional stability. Since it is a material, it is attracting attention as a material for filter cloths, particularly bag filter cloths.
【０００６】[0006]
【発明が解決しようとする課題】しかしながら、ポリベ
ンザゾール系繊維には耐酸性に難があり、バグフィルタ
ーとして汎用性を高めていくうえで大きな障害となる。
本発明はこの様な事情に着目してなされたものであっ
て、その目的は、ポリベンザゾール系繊維を主たる素材
とし、該繊維の有する優れた諸物性を維持しつつ耐酸性
の改善された濾布用不織布を提供しようとするものであ
る。However, the polybenzazole fiber has a difficulty in acid resistance, which is a major obstacle in increasing versatility as a bag filter.
The present invention has been made by paying attention to such circumstances, and an object thereof is to improve the acid resistance while maintaining excellent physical properties of the polybenzazole fiber as a main material. It is intended to provide a nonwoven fabric for filter cloth.
【０００７】[0007]
【課題を解決するための手段】上記課題を解決すること
のできた本発明に係る濾布用不織布の構成は、ポリベン
ザゾール系繊維からなるウエブＡの片面側に、ポリベン
ザゾール系繊維にポリフェニレンサルファイド繊維を配
合してなるウエブＢを重ね合わせると共に、他面側には
ポロフェニレンサルファイド繊維からなるウエブＣを重
ね合わせてなり、該積層ウエブ中に占める前記ウエブＡ
の比率Ｘが４５〜７５重量％、ウエブＡに対するウエブ
Ｃの比率が１４〜４０重量％であり、且つ積層ウエブ中
の全ポリベンザゾール系繊維に対するポリフェニレンサ
ルファイド繊維の比率Ｚが、下記（１）式の関係を満た
すものであるところに要旨を有するものである。The non-woven fabric for filter cloth according to the present invention, which has been able to solve the above-mentioned problems, has a structure in which one side of a web A made of polybenzazole-based fibers and polyphenylene on polybenzazole-based fibers are used. The web B formed by blending sulfide fibers is overlaid, and the web C formed by polophenylene sulfide fibers is overlaid on the other surface side, and the web A occupies in the laminated web.
The ratio X of 45 to 75% by weight, the ratio of the web C to the web A is 14 to 40% by weight, and the ratio Z of the polyphenylene sulfide fibers to all the polybenzazole fibers in the laminated web is the following (1). It has a gist when it satisfies the relation of formula.
【０００８】 1.77Ｘ＋0.1672≦Ｚ≦0.22Ｘ＋0.2375 ・・・・(1)1.77X + 0.1672 ≦ Z ≦ 0.22X + 0.2375 ··· (1)
【０００９】[0009]
【作用】前記した様に、ポリベンザゾール系繊維は非常
に優れた引張特性、高温耐熱性、寸法安定性などを有し
ている反面、耐酸性に難がある。これに対しポリフェニ
レンサルファイド繊維は、優れた耐酸性を有している
が、引張特性、耐熱性、寸法安定性、加工性等が不十分
である。そこで従来は、両繊維を併用することにより両
特性の補完が図られてきたのであるが、単純にポリベン
ザゾール系繊維にポリフェニレンサルファイド繊維を混
合使用しただけでは、大幅な引張特性と高温耐熱性およ
び耐酸性を改善することはできない。As described above, the polybenzazole fiber has very excellent tensile properties, high temperature heat resistance, dimensional stability, etc., but it has poor acid resistance. On the other hand, the polyphenylene sulfide fiber has excellent acid resistance, but the tensile properties, heat resistance, dimensional stability, processability, etc. are insufficient. Therefore, in the past, both properties have been complemented by using both fibers together.However, if the polyphenylene sulfide fiber is simply mixed with the polybenzazole fiber, the tensile properties and high temperature heat resistance will be greatly improved. And acid resistance cannot be improved.
【００１０】そこで本発明者らは、ポリベンザゾール系
繊維とポリフェニレンサルファイド繊維の両特性をより
効果的に発揮せしめ得る様な不織布の構成について詳細
な検討を進めた結果、上記の様に両繊維を適正な積層構
成とすると共に両繊維の構成比率を特定の範囲に設定し
てやれば、両繊維の特性がうまく補完され、卓越した性
能の濾布用不織布が得られることを知り、ここに本発明
を完成したものである。Therefore, the present inventors have conducted a detailed study on the constitution of a non-woven fabric which can more effectively exhibit both the characteristics of the polybenzazole fiber and the polyphenylene sulfide fiber, and as a result, as described above, Knowing that if the composition ratio of both fibers is set to a specific range while having a proper laminated structure, the characteristics of both fibers are well complemented, and a nonwoven fabric for filter cloth with excellent performance can be obtained, and the present invention will be described here. Is completed.
【００１１】上記の様に本発明の濾布不織布はＡ、Ｂ、
Ｃの３種の短繊維ウエブを積層して構成されるものであ
り、第１層はポリベンザゾール系重合体からなる短繊維
ウエブにより構成される。本発明で用いられるポリベン
ザゾール系繊維の種類は特に制限されないが、好ましい
のは例えば特開昭６１−５０１４５２号の特許請求の範
囲における請求項３２〜３５に記載されている化学式を
繰り返し単位とする重合体または共重合体とポリリン酸
からなるドープを乾湿式紡糸して得られる繊維である。As described above, the filter cloth non-woven fabric of the present invention has A, B,
It is configured by laminating three types of C short fiber webs, and the first layer is configured by a short fiber web made of a polybenzazole-based polymer. The kind of the polybenzazole fiber used in the present invention is not particularly limited, but it is preferable to use the chemical formulas described in claims 32 to 35 in the claims of JP-A-61-501452 as repeating units. A fiber obtained by dry-wet spinning a dope composed of a polymer or copolymer and polyphosphoric acid.
【００１２】この第１層を構成するポリベンザゾール系
繊維ウエブＡは４．０ＧＰａ程度以上の引張強度を有す
るものが好ましく、引張強度が４．０ＧＰａ未満のもの
では、成形した濾布用不織布中においてポリフェニレン
サルファイド繊維の低い引張強度を十分に補完し難く、
製品が引張強度不足となる。またこのベンザゾール系繊
維は、均一なウエブを形成すると共に、濾布用不織布の
加工性や集塵効率等の性能を高める意味から、単糸繊度
は０．３〜３０デニール、平均繊維長は３０〜２００ｍ
ｍのものが好ましい。The polybenzazole fiber web A constituting the first layer preferably has a tensile strength of about 4.0 GPa or more, and when the tensile strength is less than 4.0 GPa, the nonwoven fabric for a filter cloth is formed. In, it is difficult to sufficiently supplement the low tensile strength of polyphenylene sulfide fiber,
The product has insufficient tensile strength. Further, this benzazole fiber forms a uniform web and enhances performance such as processability and dust collection efficiency of the nonwoven fabric for filter cloth, and thus has a single yarn fineness of 0.3 to 30 denier and an average fiber length of 30. ~ 200m
m is preferable.
【００１３】また、濾布用不織布として引張特性と高温
耐熱性および寸法安定性の面から、該濾布用不織布中に
占める第１層のウエブＡの比率は４５〜７５重量％、よ
り好ましくは５０〜７０重量％の範囲にすることが必要
であり、ウエブＡの重量比率が４５％未満では、濾布用
布帛としての引張特性、高温耐熱性、寸法安定性が不十
分になるばかりでなく、通気性が非常に低くなって濾過
時の圧損が著しくなるほか柔軟性も乏しくなる。一方、
第１層短繊維ウエブＡの重量比率が７５％を超えると、
相対的にポリフェニレンサルファイド繊維ウエブの比率
が少なくなるため、濾布用不織布としての耐酸性や濾布
に付着した塵埃の払い落とし性（所謂防塵性）が悪くな
る。From the viewpoints of tensile properties, high temperature heat resistance and dimensional stability as the nonwoven fabric for filter cloth, the proportion of the web A of the first layer in the nonwoven fabric for filter cloth is 45 to 75% by weight, more preferably It is necessary to set it in the range of 50 to 70% by weight, and when the weight ratio of the web A is less than 45%, not only the tensile properties, high temperature heat resistance and dimensional stability of the filter cloth become insufficient, , The air permeability becomes very low, the pressure loss during filtration becomes significant, and the flexibility becomes poor. on the other hand,
When the weight ratio of the first layer short fiber web A exceeds 75%,
Since the proportion of the polyphenylene sulfide fiber web is relatively small, the acid resistance of the nonwoven fabric for filter cloth and the ability to remove dust adhering to the filter cloth (so-called dustproof property) are deteriorated.
【００１４】第１層を構成するウエブＡの目付は、集塵
効率や加工性とも相関性を有しており、濾布用不織布全
体としての目付や第１〜第３の積層ウエブに対する形態
保持性の付与手段にもよるが、通常は３０〜１８０ｇ／
ｍ2 、より好ましくは５０〜１５０ｇ／ｍ2 の範囲のも
のを使用するのがよい。The basis weight of the web A constituting the first layer has a correlation with the dust collection efficiency and workability, and the basis weight of the whole nonwoven fabric for filter cloth and the shape retention for the first to third laminated webs are maintained. Depending on the means for imparting sex, it is usually 30 to 180 g /
It is preferable to use m 2 , more preferably 50 to 150 g / m 2 .
【００１５】濾布用不織布における第２層は、ポリフェ
ニレンサルファイド重合体からなる繊維を配合したポリ
ベンザゾール系繊維のウエブＢによって構成する。ここ
で用いられるポリフェニレンサルファイド繊維とは、構
成単位の９０モル％程度以上がｐ−フェニレンサルファ
イド繰り返し単位からなり、また１０モル％程度以下の
比率で共重合成分を含む重合体（その製法は、例えば特
公昭４５−３２６８号公報、特公昭５２−１２２４０号
公報、特公昭５４−８７１９号公報等に開示されてい
る）を、公知の溶融紡糸法で繊維化したものである。The second layer of the non-woven fabric for filter cloth is composed of a web B of polybenzazole type fibers containing fibers made of polyphenylene sulfide polymer. The polyphenylene sulfide fiber used here is a polymer in which about 90 mol% or more of the constituent units are p-phenylene sulfide repeating units, and a polymer containing a copolymerization component at a ratio of about 10 mol% or less (the production method is, for example, Japanese Patent Publication No. 45-3268, Japanese Patent Publication No. 52-12240, Japanese Patent Publication No. 54-8719) and the like are made into fibers by a known melt spinning method.
【００１６】本発明において、第２層にポリフェニレン
サルファイド繊維を配合する目的は、濾布用不織布にお
ける厚さ方向に耐熱性と耐酸性に勾配を付与するためで
ある。本発明に係る濾布用不織布の成形に当たっては、
積層ウエブを刺針処理し、もしくはこの刺針処理と共に
加熱溶融や熱圧着処理が併用されるが、この場合には、
前記第１層のウエブＡと第２層のウエブＢとの間に結合
点を形成させて層間剥離を防ぎ、強度と形態保持性を強
化するものであるから、ポリフェニレンサルファイド繊
維ウエブは加熱溶融または熱圧着に際してポリベンザゾ
ール系繊維に良くなじむこと、換言すれば良く濡れるも
のであることが好ましい。こうした特性は、ポリフェニ
レンサルファイド繊維の溶融粘度が関係するので、用い
るポリフェニレンサルファイドとしては、紡糸安定性お
よび得られる繊維の引張特性が０．３０ＧＰａ以下に低
下しない範囲で、できるだけ溶融粘度の低いポリフェニ
レンサルファイド重合体を用いるのがよい。In the present invention, the purpose of incorporating the polyphenylene sulfide fiber in the second layer is to impart a gradient in heat resistance and acid resistance in the thickness direction of the nonwoven fabric for filter cloth. In forming the nonwoven fabric for filter cloth according to the present invention,
The laminated web is punctured, or heat fusion and thermocompression bonding are used in combination with this puncturing. In this case,
Since a bonding point is formed between the web A of the first layer and the web B of the second layer to prevent delamination and enhance strength and shape retention, the polyphenylene sulfide fiber web is melted by heating or It is preferable that the polybenzazole-based fiber is well adapted to the thermocompression bonding, in other words, it is well wettable. Since these properties are related to the melt viscosity of the polyphenylene sulfide fiber, the polyphenylene sulfide to be used should be as low as possible in the range where the spinning stability and the tensile properties of the obtained fiber do not decrease to 0.30 GPa or less. It is better to use coalescing.
【００１７】第２層のウエブＢに配合されるポリフェニ
レンサルファイド繊維は、０．３０ＧＰａ程度以上の引
張強度を有するものが好ましい。しかして引張強度が
０．３０ＧＰａ未満のものでは、カーディング工程にお
けるカード通過性が低下して生産性を悪化させるばかり
でなく、濾布用不織布に成形した後の引張強度も低くな
る。ウエブＢを構成するポリベンザゾール系繊維および
ポリフェニレンサルファイド繊維は単糸繊度が０．３〜
３０デニール、平均繊維長が３０〜２００ｍｍのものを
適宜選択して使用すればよいが、カード通過性の面から
すると、両繊維の単糸繊度および平均繊維長は極力近接
させる方が好ましい。The polyphenylene sulfide fiber blended in the web B of the second layer preferably has a tensile strength of about 0.30 GPa or more. However, when the tensile strength is less than 0.30 GPa, not only the card passing property in the carding process is deteriorated and productivity is deteriorated, but also the tensile strength after being formed into a nonwoven fabric for filter cloth is lowered. The polybenzazole fiber and the polyphenylene sulfide fiber constituting the web B have a single yarn fineness of 0.3 to
A fiber having a denier of 30 and an average fiber length of 30 to 200 mm may be appropriately selected and used, but from the viewpoint of card-passing property, it is preferable that the single yarn fineness and the average fiber length of both fibers are as close as possible.
【００１８】ポリベンザゾール系繊維とポリフェニレン
サルファイド繊維の配合・混綿方法に特に制限はなく、
従来公知の方法または装置を使用すればよく、またウエ
ブの形成には通常の不織布製造装置、カーディング法や
エアレイ法等を適用すればよい。There is no particular limitation on the blending / blending method of the polybenzazole fiber and the polyphenylene sulfide fiber,
A conventionally known method or apparatus may be used, and an ordinary nonwoven fabric manufacturing apparatus, a carding method, an air lay method, or the like may be applied to form the web.
【００１９】濾布用不織布における第３層は、ポリフェ
ニレンサルファイド繊維ウエブＣによって構成される。
このねらいは、酸性気体に直接接触する濾布用不織布面
の耐酸性を改善する為であり、ポリフェニレンサルファ
イド系短繊維ウエブからなる第３層の重量比率は第１層
および第２層との関係も考慮して決められるべきであ
り、第１層ウエブＡの量を基準とした場合の比率は１４
〜４０％、より好ましくは１６〜３５％の範囲にすべき
である。しかして該比率が１４％未満では濾布用不織布
が耐酸性不足となり、一方この比率が４０％を超える
と、得られる濾布用不織布の高温耐熱性や引張強度およ
び高温寸法安定性等が不十分となる。The third layer of the non-woven fabric for filter cloth is composed of a polyphenylene sulfide fiber web C.
This aim is to improve the acid resistance of the non-woven fabric surface for filter cloth that is in direct contact with acidic gas, and the weight ratio of the third layer made of polyphenylene sulfide-based short fiber web is related to the first layer and the second layer. It should be determined in consideration of the above. The ratio based on the amount of the first layer web A is 14
It should be in the range of -40%, more preferably 16-35%. However, when the ratio is less than 14%, the nonwoven fabric for filter cloth has insufficient acid resistance, while when the ratio exceeds 40%, the high temperature heat resistance, tensile strength and high temperature dimensional stability of the obtained nonwoven fabric for filter cloth are unsatisfactory. Will be enough.
【００２０】この第３層のウエブＣを構成するポリフェ
ニレンサルファイド繊維は、０．３０ＧＰａ以上の引張
強度を有するものが好ましく、また不織布を成形する際
の刺針処理に加熱溶融または熱圧着処理を併用する場合
には、前記と同様の理由から、紡糸安定性と得られる繊
維物性が０．３０ＧＰａ未満に低下しない範囲で溶融粘
度のできるだけ低い重合体から得た繊維を用いることが
望まれる。It is preferable that the polyphenylene sulfide fiber constituting the web C of the third layer has a tensile strength of 0.30 GPa or more, and heat fusion or thermocompression treatment is used in combination with the needle treatment for forming the nonwoven fabric. In this case, for the same reason as described above, it is desirable to use a fiber obtained from a polymer having a melt viscosity as low as possible within a range in which the spinning stability and the obtained fiber physical property do not decrease below 0.30 GPa.
【００２１】また該第３層のウエブＣを構成するポリフ
ェニレンサルファイド繊維としては、単糸繊度が０．３
〜３０デニール、平均繊維長が３０〜２００ｍｍの範囲
のものから適宜選択すればよいが、カード通過性の面か
らすると、前記ウエブＡ，Ｂを構成する繊維の単糸繊度
や平均繊維長に近いものを使用するのがよい。The polyphenylene sulfide fiber constituting the web C of the third layer has a single yarn fineness of 0.3.
It may be appropriately selected from those having a denier of 30 to 30 and an average fiber length of 30 to 200 mm, but from the viewpoint of card passing property, it is close to the single yarn fineness and the average fiber length of the fibers constituting the webs A and B. It is better to use one.
【００２２】このとき不織布全体中に占めるポリベンザ
ゾール系繊維およびポリフェニレンサルファイド繊維の
配合比率は、濾布用不織布の高温耐熱性、引張強度、形
態保持性、耐酸性、集塵効率等に顕著な影響を及ぼし、
また第１層のウエブＡから第３層のウエブＣへのポリベ
ンザゾール系繊維とポリフェニレンサルファイド繊維の
配合比率の勾配も、不織布の引張強度、高温耐熱性、耐
酸性に大きく影響する。従って本発明では、まず前記ウ
エブＡ，Ｂ，Ｃの積層形態を特定し、ポリベンザゾール
系繊維とポリフェニレンサルファイド繊維からなるウエ
ブＢを中間にして、その片面にポリベンザゾール系繊維
からなるウエブＡを重ね合わせると共に、他面側にポリ
フェニレンサルファイド繊維からなるウエブＣを重ね合
わせ、それによりポリベンザゾール系繊維の配合比率に
勾配を持たせている。At this time, the blending ratio of the polybenzazole fiber and the polyphenylene sulfide fiber in the whole nonwoven fabric is remarkable in high temperature heat resistance, tensile strength, shape retention, acid resistance, dust collection efficiency, etc. of the nonwoven fabric for filter cloth. Affect
Further, the gradient of the blending ratio of the polybenzazole fiber and the polyphenylene sulfide fiber from the web A of the first layer to the web C of the third layer also greatly affects the tensile strength, high temperature heat resistance and acid resistance of the nonwoven fabric. Therefore, in the present invention, first, the laminated form of the webs A, B, and C is specified, and the web B made of the polybenzazole fiber and the polyphenylene sulfide fiber is placed in the middle, and the web A made of the polybenzazole fiber is provided on one side thereof. And the web C made of polyphenylene sulfide fiber is superposed on the other surface side, thereby giving a gradient to the blending ratio of the polybenzazole fiber.
【００２３】それに加えて本発明では、両繊維の特性を
より効果的に発揮させるため、積層ウエブ全量（Ａ＋Ｂ
＋Ｃ）中に占める全ポリベンザゾール系繊維に対するポ
リフェニレンサルファイド繊維の比率Ｚが前記（１）式
の要件を満たす様に定めている。しかして、（１）式の
Ｚを超える多量のポリフェニレンサルファイド繊維を配
合して得た濾布用不織布では、引張強度や高温耐熱性が
悪くなると共に、ポリフェニレンサルファイド繊維によ
って生じる収縮力が高くなりすぎて形態保持性や寸法安
定性も低下し、一方、（１）式で定めるＺの下限値を下
回るポリフェニレンサルファイド繊維が配合されたもの
では濾布用不織布として十分な耐酸性が得られなくなる
からである。In addition to this, in the present invention, in order to exert the characteristics of both fibers more effectively, the total amount of laminated webs (A + B)
The ratio Z of the polyphenylene sulfide fibers to the total polybenzazole fibers in + C) is determined so as to satisfy the requirement of the above formula (1). However, in the nonwoven fabric for filter cloth obtained by blending a large amount of polyphenylene sulfide fiber exceeding Z of the formula (1), the tensile strength and the high temperature heat resistance are deteriorated, and the shrinkage force generated by the polyphenylene sulfide fiber is too high. As a result, the shape retention and dimensional stability are also reduced, and on the other hand, when a polyphenylene sulfide fiber having a value lower than the lower limit of Z defined by the formula (1) is blended, sufficient acid resistance cannot be obtained as a nonwoven fabric for filter cloth. is there.
【００２４】本発明の濾布用不織布は、前記したウエブ
Ａ、Ｂ、Ｃの３種を積層した後、形態保持性を付与して
不織布マット状に成形する。形態保持性を付与するに
は、ニードルパンチ、ステッチおよびスパンレース等の
手段を用いてウエブに機械的に交絡を施す方法や加熱溶
融や熱圧着の手段により熱的に結合点を形成させる方法
などが採用できる。The non-woven fabric for filter cloth of the present invention is formed into a non-woven mat by imparting shape retention after laminating the above-mentioned three kinds of webs A, B and C. To impart shape retention, a method of mechanically entangle the web using a means such as needle punching, stitching and spunlace, or a method of thermally forming a bonding point by means of heat melting or thermocompression bonding, etc. Can be adopted.
【００２５】[0025]
【実施例】次に本発明の実施例を示すが、本発明はもと
より下記実施例によって制限を受けるものではなく、前
後記の趣旨に適合し得る範囲で適当に変更を加えて実施
することも勿論可能であり、それらはいずれも本発明の
技術的範囲に含まれる。EXAMPLES Next, examples of the present invention will be shown, but the present invention is not limited by the following examples, and may be carried out with appropriate modifications within a range compatible with the gist of the preceding and following description. Of course, it is possible, and all of them are included in the technical scope of the present invention.
【００２６】尚、下記実施例で採用した性能評価等は次
の方法で行なった。 ＜繊維の繊度＞標準状態（温度２０±２℃、相対湿度６
５±２％の状態）の試験室で、サーチ社製のオートバイ
プロ式繊度測定器「DENIER COMPUTER DC-11B型」を用い
て、試料長５０ｍｍ、本数２０で単糸繊度を測定し、算
術平均値を求めて繊度とした。 ＜繊維の引張強度および伸度＞ＪＩＳ Ｌ−１０１３に
準拠し、オリエンテック（株）社製テンシロンにより、
つかみ間隔２０ｃｍ、引張速度１００％／ｍｉｎ、ｎ＝
１０で測定を行ない、算術平均値を求めた。The performance evaluation and the like adopted in the following examples were carried out by the following method. <Fiber fineness> Standard condition (Temperature 20 ± 2 ° C, Relative humidity 6
(5 ± 2% state), using a motorcycle professional type fineness measuring instrument "DENIER COMPUTER DC-11B type" manufactured by Search, the single yarn fineness is measured with a sample length of 50 mm and the number of filaments is 20, and the arithmetic mean is calculated. The value was determined and used as the fineness. <Tensile Strength and Elongation of Fiber> Based on JIS L-1013, Tensilon manufactured by Orientec Co., Ltd.
Grip interval 20 cm, pulling speed 100% / min, n =
The measurement was performed at 10 to obtain the arithmetic mean value.
【００２７】＜不織布の引張強度、伸度、耐酸性＞不織
布の縦方向を試験片の長手方向とし、ＪＩＳ Ｋ−７０
５４に準拠して２５ｍｍ当たりの破断強力を測定した。
なお、試料は不織布を１０ｃｍ×１０ｃｍの大きさに切
断し、これを７％硫酸中に２０分間浸した後、液から取
り出して風乾し、さらに２００℃の熱風中で１時間の加
熱処理を行なって調整した。 ＜不織布の通気量＞フラジール型通気を使用し、ＪＩＳ
Ｌ−１０９６−６−２７−１−Ａに準拠した方法・条
件で通気量を測定した。 ＜高温耐熱性＞空気雰囲気中で温度と時間を変えて加熱
処理した不織布につき、ＪＩＳ−Ｋ−７０５４に準拠し
た方法・条件で破断強力を測定して保持率を求めた。保
持率が５０％未満は×、５０％以上は○として高温耐熱
性を判定した。<Tensile Strength, Elongation, Acid Resistance of Nonwoven Fabric> The longitudinal direction of the nonwoven fabric is defined as the longitudinal direction of the test piece, and JIS K-70 is used.
According to 54, the breaking strength per 25 mm was measured.
The sample was cut into a size of 10 cm x 10 cm, dipped in 7% sulfuric acid for 20 minutes, taken out of the solution, air-dried, and further heat-treated in hot air at 200 ° C for 1 hour. I adjusted it. <Aeration amount of non-woven fabric> Using Frazier type ventilation, JIS
The air flow rate was measured by the method and conditions based on L-1096-6-27-1-A. <High-temperature heat resistance> With respect to the non-woven fabric which was heat-treated in an air atmosphere at different temperatures and times, the breaking strength was measured by the method and conditions according to JIS-K-7054 to obtain the retention rate. The high temperature heat resistance was judged as x when the retention rate was less than 50% and ◯ when the retention rate was 50% or more.
【００２８】実施例１〜６ 引張強度が５．９ＧＰａ、単糸繊度が３．０デニール、
繊維長が５１ｍｍのポリベンザゾール系短繊維［ポリ
（パラフェニレンベンツビスオキサゾール）短繊維］ウ
エブを第１層とし、強度が０．６ＧＰａ、単糸繊度が
１．０デニール、繊維長が５１ｍｍのポリフェニレンサ
ルファイド繊維が特定比率で配合された引張強度５．９
ＧＰａで単糸繊度が１．０デニール、繊維長５１ｍｍの
ポリベンザゾール系短繊維（同前）ウエブを第２層と
し、また引張強度が５．９６ＧＰａ、単糸繊度が１．５
デニール、繊維長が５１ｍｍのポリフェニレンサルファ
イド短繊維ウエブを第３層とし、これらを重畳した後、
ニードルパンチ機によって毎分５００ストローク、針深
さ５ｍｍ、針密度１２０本で刺針処理を施し、目付４５
０ｇ／ｍ2 のニードルパンチング不織布を形成した。次
いで各不織布のポリフェニレンサルファイド繊維側を高
周波加熱した後、加熱ローラーでプレス表面処理した。
このとき、不織布全体に占める第１層および第３層の重
量比率、第２層の混合ウエブを構成するポリベンザゾー
ル系繊維とポリフェニレンサルファイド繊維の配合比率
等を表１に示す様に変更した。得られた各不織布の性能
評価結果を表１に示す。Examples 1 to 6 Tensile strength is 5.9 GPa, single yarn fineness is 3.0 denier,
The first layer is a polybenzazole-based short fiber [poly (paraphenylenebenzbisoxazole) short fiber] having a fiber length of 51 mm, a strength of 0.6 GPa, a single yarn fineness of 1.0 denier, and a fiber length of 51 mm. Tensile strength 5.9 in which polyphenylene sulfide fiber is blended in a specific ratio
A single fiber fineness of 1.0 denier at GPa, a polybenzazole-based short fiber (same as above) web having a fiber length of 51 mm as the second layer, and a tensile strength of 5.96 GPa and a single yarn fineness of 1.5.
A denier, polyphenylene sulfide short fiber web having a fiber length of 51 mm was used as the third layer, and after superposing these,
Needle punching machine 500 strokes per minute, needle depth 5mm, needle density 120 needles, and needle weight 45
A needle punched nonwoven fabric of 0 g / m 2 was formed. Next, after the polyphenylene sulfide fiber side of each nonwoven fabric was heated at high frequency, press surface treatment was performed with a heating roller.
At this time, the weight ratio of the first layer and the third layer in the whole nonwoven fabric, the compounding ratio of the polybenzazole fiber and the polyphenylene sulfide fiber forming the mixed web of the second layer, etc. were changed as shown in Table 1. Table 1 shows the performance evaluation results of the obtained non-woven fabrics.
【００２９】[0029]
【表１】 [Table 1]
【００３０】表１はすべて本発明の規定要件を満たす実
施例であり、いずれも高強度で、高温耐熱性、耐酸性、
耐熱性の格段に優れたものであり、例えばバグフィルタ
ー用の濾布として苛酷な条件にも耐え得るものであるこ
とが分かる。Table 1 shows all examples satisfying the requirements of the present invention. All of them have high strength, high temperature heat resistance, acid resistance,
It can be seen that the heat resistance is remarkably excellent, and for example, it can withstand severe conditions as a filter cloth for a bag filter.
【００３１】比較例１〜４ 上記実施例１において、不織布全体に占める第１層およ
び第３層の重量比率、第２層の混合ウエブを構成するポ
リベンザゾール系繊維とポリフェニレンサルファイド繊
維の配合比率等が全て本発明の規定範囲を外れる様に変
更した他は同様にして実験を行ない表２に示す結果を得
た。Comparative Examples 1 to 4 In the above-mentioned Example 1, the weight ratio of the first layer and the third layer in the whole nonwoven fabric, and the compounding ratio of the polybenzazole fiber and the polyphenylene sulfide fiber forming the mixed web of the second layer. The same experiment was conducted except that all the above were changed so as to be out of the specified range of the present invention, and the results shown in Table 2 were obtained.
【００３２】[0032]
【表２】 [Table 2]
【００３３】表２から明らかである様に、不織布全体に
対する第１層ウエブＡの比率Ｘが本発明の範囲から外れ
る場合（比較例１〜２）、不織布を構成する全ポリフェ
ニレンサルファイド繊維ウエブ量とポリベンザゾール系
繊維ウエブ量の比率Ｚが本発明の範囲を外れる場合（比
較例３〜４）は、耐熱性、耐酸性、破断強力の何れかが
欠けるため本発明の目的とする性能を有する濾布用不織
布は得られない。As is clear from Table 2, when the ratio X of the first layer web A to the whole nonwoven fabric is out of the range of the present invention (Comparative Examples 1 and 2), the total amount of the polyphenylene sulfide fiber webs constituting the nonwoven fabric is When the ratio Z of the amount of the polybenzazole-based fiber web is out of the range of the present invention (Comparative Examples 3 to 4), any of heat resistance, acid resistance, and breaking strength is lacking, so that the target performance of the present invention is obtained. Non-woven fabric for filter cloth cannot be obtained.
【００３４】比較例５，６ 実施例１、２においてポリベンザゾール系繊維に代えて
全芳香族系ポリアミド繊維（「ケブラー２９」デュポン
社の商品名）を使用した以外は実施例１、２に記載した
のと同一の方法で積層ウエブを作成し、該ウエブを用い
て実施例１と同様の手順および方法でニードルパンチ処
理を行なって不織布を作成すると共にその物性を調べ
た。結果を表３に示す。Comparative Examples 5 and 6 In Examples 1 and 2 except that wholly aromatic polyamide fibers (“Kevlar 29”, a trade name of DuPont) were used in place of the polybenzazole fibers in Examples 1 and 2. A laminated web was prepared by the same method as described, and the nonwoven fabric was prepared by needle punching using the web in the same procedure and method as in Example 1 and the physical properties thereof were examined. The results are shown in Table 3.
【００３５】[0035]
【表３】 [Table 3]
【００３６】表３からも明らかである様に、従来の代表
的な耐熱性繊維を使用し、且つ好適な積層構成とした不
織布であっても、耐熱性と耐酸性の両立は期待できな
い。As is clear from Table 3, even a non-woven fabric using conventional typical heat resistant fibers and having a suitable laminated structure cannot be expected to have both heat resistance and acid resistance.
【００３７】[0037]
【発明の効果】本発明は以上の様に構成されており、不
織布の厚さ方向でポリベンザゾール系繊維とポリフェニ
レンサルファイド繊維の配合比率を適正に調整すると共
に、不織布の厚さ方向でポリベンザゾール系繊維の配合
比率に勾配を持たせることによって、耐酸性と高温耐熱
性を兼備した高強度の濾布用不織布を提供し得ることに
なった。従って、この不織布を使用すれば、苛酷な条件
下でも使用可能なバグフィルターを製造することがで
き、産業界に寄与すること大である。EFFECT OF THE INVENTION The present invention is constituted as described above, and properly adjusts the compounding ratio of the polybenzazole fiber and the polyphenylene sulfide fiber in the thickness direction of the non-woven fabric, and at the same time, the polybenza in the thickness direction of the non-woven fabric. By making the blending ratio of the sol-based fibers have a gradient, it is possible to provide a high-strength nonwoven fabric for filter cloth having both acid resistance and high-temperature heat resistance. Therefore, if this non-woven fabric is used, it is possible to manufacture a bag filter that can be used even under severe conditions, which greatly contributes to the industrial world.
───────────────────────────────────────────────────── フロントページの続き (51)Int.Cl.6 識別記号 庁内整理番号 ＦＩ 技術表示箇所 Ｄ０４Ｈ 1/48 Ｂ 7199−3Ｂ 1/54 Ｌ 7199−3Ｂ ─────────────────────────────────────────────────── ─── Continuation of the front page (51) Int.Cl. 6 Identification code Office reference number FI Technical display location D04H 1/48 B 7199-3B 1/54 L 7199-3B
Claims (1)
Ａの片面側に、ポリベンザゾール系繊維にポリフェニレ
ンサルファイド繊維を配合してなるウエブＢを重ね合わ
せると共に、他面側にはポリフェニレンサルファイド繊
維からなるウエブＣを重ね合わせてなり、該積層ウエブ
中に占める前記ウエブＡの比率Ｘが４５〜７５重量％、
ウエブＡに対するウエブＣの比率が１４〜４０重量％で
あり、且つ積層ウエブ中の全ポリベンザゾール系繊維に
対するポリフェニレンサルファイド繊維の比率Ｚが、下
記（１）式の関係を満たすものであることを特徴とする
濾布用不織布。 1.77Ｘ＋0.1672≦Ｚ≦0.22Ｘ＋0.2375 ・・・・(1)1. A web B made of a polybenzazole fiber mixed with a polyphenylene sulfide fiber is laid on one side of a web A made of a polybenzazole fiber, and the other side is made of a polyphenylene sulfide fiber. The webs C are superposed, and the ratio X of the webs A in the laminated webs is 45 to 75% by weight,
The ratio of the web C to the web A is 14 to 40% by weight, and the ratio Z of the polyphenylene sulfide fibers to the total polybenzazole fibers in the laminated web satisfies the relation of the following formula (1). Characteristic nonwoven fabric for filter cloth. 1.77X + 0.1672 ≦ Z ≦ 0.22X + 0.2375 ・ ・ ・ ・ (1)
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP27454493A JP3430424B2 (en) | 1993-11-02 | 1993-11-02 | Non-woven fabric for filter cloth |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP27454493A JP3430424B2 (en) | 1993-11-02 | 1993-11-02 | Non-woven fabric for filter cloth |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH07126972A true JPH07126972A (en) | 1995-05-16 |
| JP3430424B2 JP3430424B2 (en) | 2003-07-28 |
Family
ID=17543199
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP27454493A Expired - Fee Related JP3430424B2 (en) | 1993-11-02 | 1993-11-02 | Non-woven fabric for filter cloth |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP3430424B2 (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2007136453A (en) * | 2005-10-21 | 2007-06-07 | Morimura Kosan Kk | Fibrous filter screen |
| WO2009087901A1 (en) * | 2008-01-09 | 2009-07-16 | Toray Industries, Inc. | Polyphenylene sulfide fiber and process for producing the same |
-
1993
- 1993-11-02 JP JP27454493A patent/JP3430424B2/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2007136453A (en) * | 2005-10-21 | 2007-06-07 | Morimura Kosan Kk | Fibrous filter screen |
| WO2009087901A1 (en) * | 2008-01-09 | 2009-07-16 | Toray Industries, Inc. | Polyphenylene sulfide fiber and process for producing the same |
Also Published As
| Publication number | Publication date |
|---|---|
| JP3430424B2 (en) | 2003-07-28 |
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