JP2018193648A - Polyamide-based conductive composite fiber - Google Patents
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本発明は、ポリアミド系導電性複合繊維に関するものである。 The present invention relates to a polyamide-based conductive conjugate fiber.
導電性を有する導電性繊維は、主に静電気によるスパークや埃のまとわりつきを防ぐ目的で引火性危険物取扱者のユニフォーム、クリーンルーム用防塵衣、カーペット、カーテン等用の生地に用いられることが多い。このような生地に用いられる際は、数ｍｍ〜数ｃｍのピッチでグリット状またはストライプ状に導電繊維が挿し込まれており、これらの生地には低温低湿といった、種々の環境下でも安定した制電性能が求められている。
このような生地に用いる導電性繊維として、例えば、金属そのものからなる金属繊維、一般的な繊維に金属をメッキした金属メッキ繊維、一般的な繊維に導電性物質混練樹脂を溶融または溶液被覆させた導電性被覆繊維、導電性物質の混練樹脂組成物と熱可塑性樹脂を溶融複合紡糸した導電性複合繊維等が挙げられる。中でも、スパークを生じさせない制電性能、布帛とした際の風合い、耐腐食性、耐薬品性、耐伸張性、耐摩擦性、洗濯耐久性、製造コスト等を鑑みて、導電性カーボンブラックを使用した導電性複合繊維が最も好まれて使用されている。このような導電性複合繊維の繊維横断面においては、導電層が非導電層に完全に包まれている非露出タイプと、導電層が繊維表面の一部または繊維表面全体に露出している露出タイプがあり、用途に応じて様々な繊維横断面を持つ導電性複合繊維が使用されている。（特許文献１、特許文献２、特許文献３）
Conductive conductive fibers are often used in fabrics for flammable hazardous material handlers, dustproof clothes for clean rooms, carpets, curtains, etc., mainly for the purpose of preventing sparks and clinging of dust due to static electricity. When used in such fabrics, conductive fibers are inserted in grit or stripes at a pitch of several millimeters to several centimeters, and these fabrics are stable under various environments such as low temperature and low humidity. Electric performance is required.
As conductive fibers used for such fabrics, for example, metal fibers made of metal itself, metal-plated fibers obtained by plating metal on general fibers, and conductive fibers kneaded with a conductive material kneaded resin or solution-coated. Examples thereof include conductive coated fibers, conductive composite fibers obtained by melt-combining a kneaded resin composition of a conductive substance and a thermoplastic resin. In particular, conductive carbon black is used in consideration of anti-static performance that does not cause spark, texture when used as a fabric, corrosion resistance, chemical resistance, stretch resistance, friction resistance, washing durability, manufacturing cost, etc. Conductive conjugate fibers are most preferred and used. In the fiber cross section of such a conductive conjugate fiber, a non-exposed type in which the conductive layer is completely wrapped in the non-conductive layer, and an exposed type in which the conductive layer is exposed on a part of the fiber surface or the entire fiber surface. There are types, and conductive composite fibers having various fiber cross sections are used depending on the application. (Patent Document 1, Patent Document 2, Patent Document 3)
ところで、繊維横断面において導電層となるカーボンブラック含有樹脂組成物を配し、非導電層かつ強度保持層となる樹脂を配し溶融複合紡糸することで導電性複合繊維となるが、カーボンブラック含有樹脂組成物は溶融流動性が低いことにより導電性複合繊維の強伸度が著しく劣り、工程通過性や耐久性に劣ったものとなるため、様々な工夫がなされている。特に後工程通過性や耐久性にかかわる導電性複合繊維の強度及び伸度に関しては、例えば一般的に強度に優れ、柔軟な樹脂として挙げられるポリアミドの中でも高粘度のものを強度保持層に使用するとより強度は向上し、工程通過性も優れたものとなる。しかし、強度保持層に高粘度ポリアミドを使用すると複合繊維の収縮率と収縮応力が高くなるため寸法安定性に劣り、例えば寸法安定性に優れるポリエステル糸と混用し、布帛として精練、染色、乾燥、仕上げ熱セットといった工程を通過させると、布帛内の導電性複合繊維の部分が強く収縮し、布帛全体が波打ったようなシワが生じ、品位に劣ったものとなる。
本発明は、上記の課題を鑑み、ポリアミド系導電性複合繊維において、強伸度及び導電性に優れ、更にポリエステル糸と混用して布帛とした際にシワが生じない寸法安定性に優れた導電性複合繊維を得ることを目的とする。
By the way, a carbon black-containing resin composition that becomes a conductive layer in the fiber cross section is arranged, and a resin that becomes a non-conductive layer and a strength holding layer is arranged and melt composite spinning is performed to form a conductive composite fiber. Since the resin composition has a low melt fluidity, the strength and elongation of the conductive conjugate fiber are remarkably inferior, and the process passability and durability are inferior. In particular, regarding the strength and elongation of the conductive composite fiber related to the passability and durability of the post-process, for example, when using a high-viscosity polyamide, which is generally excellent in strength and is used as a flexible resin, for the strength retaining layer. The strength is further improved and the process passability is excellent. However, when a high-viscosity polyamide is used for the strength retaining layer, the shrinkage rate and shrinkage stress of the composite fiber increase, so that the dimensional stability is inferior. For example, it is mixed with a polyester yarn having excellent dimensional stability, and scouring, dyeing, drying, When a process such as finishing heat setting is passed, the conductive composite fiber portion in the fabric is strongly shrunk, and the entire fabric is wrinkled, resulting in poor quality.
In view of the above-mentioned problems, the present invention is a polyamide-based conductive composite fiber that has excellent elongation and conductivity, and also has excellent dimensional stability that does not cause wrinkling when mixed with polyester yarn to form a fabric. An object is to obtain a functional composite fiber.
上記目的を達成するため、本発明は、繊維横断面において導電層と、強度保持層となる非導電層からなる導電性複合繊維であって、導電層は、導電性カーボンブラックを１５質量％以上、４５質量％以下含有したポリアミドであり、非導電層はメタキシレンジアミンと脂肪族ジカルボン酸の重縮合で得られるポリアミドである導電性複合繊維をその要旨とする。
上記導電性複合繊維において、導電層のポリアミドが、ポリアミド６、ポリアミド１２またはポリアミド６６であることが好ましい。
また、上記導電性複合繊維おいて、繊維横断面における非導電層／導電層の面積比率が３０／７０〜９８／２であることが好ましい。
In order to achieve the above object, the present invention provides a conductive composite fiber comprising a conductive layer and a non-conductive layer serving as a strength retention layer in the fiber cross section, and the conductive layer contains 15% by mass or more of conductive carbon black. The content of the polyamide is 45% by mass or less, and the non-conductive layer has a conductive composite fiber which is a polyamide obtained by polycondensation of metaxylenediamine and aliphatic dicarboxylic acid.
In the conductive conjugate fiber, the polyamide of the conductive layer is preferably polyamide 6, polyamide 12 or polyamide 66.
In the conductive conjugate fiber, the area ratio of the nonconductive layer / conductive layer in the fiber cross section is preferably 30/70 to 98/2.
本発明の導電性複合繊維は、強伸度及び導電性に優れ、ポリエステル糸と混用しても、加工後にシワ等の不良がない品位の高い布帛を得ることができる。 The conductive conjugate fiber of the present invention is excellent in high elongation and conductivity, and even when mixed with a polyester yarn, a high-quality fabric free from defects such as wrinkles after processing can be obtained.
以下、本発明を詳細に説明する。
本発明は、導電層と強度保持層となる非導電層とからなる導電性複合繊維である。
そして、非導電層はメタキシレンジアミンと脂肪族ジカルボン酸の重縮合で得られるポリアミドからなる。
Hereinafter, the present invention will be described in detail.
The present invention is a conductive conjugate fiber composed of a conductive layer and a nonconductive layer serving as a strength retention layer.
The non-conductive layer is made of polyamide obtained by polycondensation of metaxylenediamine and aliphatic dicarboxylic acid.
本発明において、非導電層を構成するポリアミドは、メタキシレンジアミンと脂肪族ジカルボン酸の重縮合から得られるポリアミドであり、例えば、メタキシレンジアミンとアジピン酸の重縮合から得られるポリアミドＭＸＤ６、メタキシレンジアミンとセバシン酸の重縮合から得られるポリアミドＭＸＤ８が好適に挙げられる。これらは三菱ガス化学（株）のＭＸナイロンシリーズとして一般的に入手できる。 In the present invention, the polyamide constituting the nonconductive layer is a polyamide obtained by polycondensation of metaxylenediamine and an aliphatic dicarboxylic acid. For example, polyamide MXD6 obtained by polycondensation of metaxylenediamine and adipic acid, metaxylene Preferable examples include polyamide MXD8 obtained from polycondensation of diamine and sebacic acid. These are generally available as the MX nylon series of Mitsubishi Gas Chemical Co., Inc.
本発明の導電性複合繊維の導電層は、導電性カーボンブラックを１５質量％以上、４５質量％以下含有したポリアミドである。 The conductive layer of the conductive conjugate fiber of the present invention is a polyamide containing 15% by mass or more and 45% by mass or less of conductive carbon black.
本発明において、導電層を構成するベースポリマーとなる熱可塑性樹脂は、ポリアミドである。
このようなポリアミドとしては、例えば、ポリアミド６、ポリアミド６６、ポリアミド１２、ポリアミド１１、ポリアミド６６及びそれらを主体とする共重合体が挙げられ、中でも、ポリアミド６、ポリアミド６６、ポリアミド１２が好ましい。
In the present invention, the thermoplastic resin serving as the base polymer constituting the conductive layer is polyamide.
Examples of such polyamides include polyamide 6, polyamide 66, polyamide 12, polyamide 11, polyamide 66, and copolymers based on them, and among these, polyamide 6, polyamide 66, and polyamide 12 are preferable.
本発明の導電性複合繊維において、導電層は、導電性カーボンブラックを１５質量％以上、４５質量％以下含有する。カーボンブラックの量が、少な過ぎると導電性及び制電性が得られず、多過ぎると、紡糸の際に、流動性が失われ製糸性が悪くなる傾向がある。中でも、カーボンブラックの含有量は、２０質量％以上、４０質量％以下が好ましい。 In the conductive conjugate fiber of the present invention, the conductive layer contains 15% by mass to 45% by mass of conductive carbon black. If the amount of carbon black is too small, conductivity and antistatic property cannot be obtained, and if it is too large, fluidity is lost during spinning and the spinning property tends to be poor. Among these, the content of carbon black is preferably 20% by mass or more and 40% by mass or less.
本発明において、導電層に用いられる導電性カーボンブラックとしては、ケッチェンブラック、ファーネスブラック、アセチレンブラックなどが挙げられ、優れた導電性を有するカーボンブラックであれば特に限定はされない。 In the present invention, examples of the conductive carbon black used in the conductive layer include ketjen black, furnace black, acetylene black, and the like, and any carbon black having excellent conductivity is not particularly limited.
本発明における導電層に導電性カーボンブラックを含有させる方法としては、（１）溶融複合紡糸時に導電性カーボンブラックと樹脂を混合する方法、（２）予め、導電性カーボンブラックとベースポリマーとなる樹脂を混練させ、導電性カーボンブラックとベースポリマーの樹脂組成物を得た後に、この樹脂組成物を溶融複合紡糸し、導電層を形成する方法等が挙げられるが、後者の方が好ましい。 As a method for containing conductive carbon black in the conductive layer in the present invention, (1) a method of mixing conductive carbon black and resin at the time of melt composite spinning, (2) a resin that becomes conductive carbon black and base polymer in advance. Are obtained by kneading and obtaining a resin composition of conductive carbon black and a base polymer, and then melt-spinning the resin composition to form a conductive layer. The latter is preferred.
本発明の導電性複合繊維は、繊維横断面における非導電層／導電層の面積比率が３０／７０〜９８／２であることが好ましい。この範囲外となった場合は十分な導電性が得られず、布帛に使用した際に制電性が損なわれたり、糸強度が著しく低下するばかりでなく、糸切れが多発するおそれがある。より好ましくは、非導電層／導電層の面積比率が５０／５０〜９５／５である。尚、本発明において、繊維横断面は、繊維軸長手方向に垂直な面をいう。 In the conductive conjugate fiber of the present invention, the area ratio of the nonconductive layer / conductive layer in the fiber cross section is preferably 30/70 to 98/2. If it is out of this range, sufficient electrical conductivity cannot be obtained, and when used in a fabric, the antistatic property is impaired, the yarn strength is remarkably lowered, and yarn breakage may occur frequently. More preferably, the area ratio of non-conductive layer / conductive layer is 50/50 to 95/5. In the present invention, the fiber cross section refers to a plane perpendicular to the longitudinal direction of the fiber axis.
本発明の導電性複合繊維の断面形状は、導電層が非導電層に完全に包まれている非露出タイプ、導電層が繊維表面の一部または繊維表面全体に露出している露出タイプのいずれでもよい。繊維表面全体に露出している露出タイプは、特に、通常、強伸度が得られにくいが、本発明の導電性複合繊維であれば、十分な強伸度を得て、ポリエステル糸と混用して布帛としても、シワにならず、品位の高い布帛を得ることができる。
本発明の導電性複合繊維において、制電性が優れる点からは、繊維表面全体に露出している露出タイプが好ましく、芯に非導電層、鞘に導電層を配したものが好ましい。
The cross-sectional shape of the conductive conjugate fiber of the present invention may be either a non-exposed type in which the conductive layer is completely wrapped in the non-conductive layer, or an exposed type in which the conductive layer is exposed on part of the fiber surface or on the entire fiber surface. But you can. The exposed type exposed on the entire fiber surface is usually difficult to obtain high elongation, but if the conductive composite fiber of the present invention is used, it is possible to obtain sufficient strength and mix with polyester yarn. As a fabric, it is possible to obtain a high-quality fabric without wrinkling.
In the conductive conjugate fiber of the present invention, from the viewpoint of excellent antistatic properties, an exposed type exposed on the entire fiber surface is preferable, and a non-conductive layer on the core and a conductive layer on the sheath are preferable.
このような本発明の導電性複合繊維は、ポリエステル糸と組み合わせた布帛に用いたとしても、加工の際にシワが生じず、クリーンルーム用の防塵衣、作業衣等に好適に用いることができる。 Even when such a conductive conjugate fiber of the present invention is used for a fabric combined with a polyester yarn, wrinkles do not occur during processing, and it can be suitably used for dustproof clothing, work clothing, etc. for clean rooms.
また、本発明の導電性複合繊維は、織編物に混用して制電性生地とし、ユニフォーム、クリーンルーム用防塵衣、カーペット、カーテンに好適に用いることができる。短繊維化して紡績糸や不織布としても良いし、導電性を利用した導電ブラシ、タッチパネル用ペン先や手袋として使用しても良い。 In addition, the conductive conjugate fiber of the present invention can be mixed with a woven or knitted fabric to form an antistatic fabric, and can be suitably used for uniforms, dustproof garments for clean rooms, carpets, and curtains. Short fibers may be used as spun yarn or non-woven fabric, or a conductive brush utilizing conductivity, a touch panel nib or a glove may be used.
本発明の導電性複合繊維の好適な製造方法の例を示す。
上記の導電性カーボンブラック、上記のポリアミドを準備し、混練して樹脂組成物を製造する。得られた樹脂組成物を導電層、ポリアミドＭＸＤ６またはポリアミドＭＸＤ８を非導電層とし、導電層と非導電層が繊維横断面で複合された状態で吐出される複合口金と用いて、溶融複合紡糸を行い、導電性複合繊維を製造する。
The example of the suitable manufacturing method of the electroconductive composite fiber of this invention is shown.
The above conductive carbon black and the above polyamide are prepared and kneaded to produce a resin composition. Using the obtained resin composition as a conductive layer, polyamide MXD6 or polyamide MXD8 as a non-conductive layer, and a composite die that is discharged in a state where the conductive layer and the non-conductive layer are combined in the cross section of the fiber, melt compound spinning is performed. To produce a conductive conjugate fiber.
以下に実施例を挙げて本発明を具体的に説明する。なお、本発明は以下に述べる実施例に限定されるものではない。尚、本発明の実施例及び比較例で得られた導電性繊維及びそれからなる生地の特性・評価は次に示す方法より求めた。 The present invention will be specifically described below with reference to examples. In addition, this invention is not limited to the Example described below. In addition, the characteristic and evaluation of the electroconductive fiber obtained by the Example and comparative example of this invention, and the fabric which consists of it were calculated | required by the method shown next.
＜ポリアミドの相対粘度ηｒ＞
９６．０％硫酸における相対粘度ηｒは、５０ｍｌの９６．０％硫酸に０．５ｇのポリアミドを溶解させた溶液を準備し、２５℃でオストワルド粘度計を通し、溶液の流下時間を硫酸の流下時間で割りかえすことにより求めた。
＜破断強度、破断伸度及び強伸度積＞
導電性複合繊維の破断強度及び破断伸度は、ＪＩＳ−Ｌ−１０１３に準じ、（株）島津製作所製ＡＧＳ−１ＫＮＧオートグラフ引っ張り試験機を用い、試料糸長２０ｃｍ、引っ張り速度２０ｃｍ／ｍｉｎの条件で試料が伸長破断したときの強度及び伸度を測定して求めた。また、それらの数値から下記式より強伸度積を求めた。後工程や耐久性を鑑みると、強伸度積は好ましくは２０以上、さらに好ましくは２２以上である。
<Relative viscosity ηr of polyamide>
For the relative viscosity ηr in 96.0% sulfuric acid, prepare a solution in which 0.5 g of polyamide was dissolved in 50 ml of 96.0% sulfuric acid, and passed through an Ostwald viscometer at 25 ° C. Obtained by dividing by time.
<Breaking strength, breaking elongation and strong elongation product>
The breaking strength and breaking elongation of the conductive conjugate fiber are in accordance with JIS-L-1013, using an AGS-1KNG autograph tensile tester manufactured by Shimadzu Corporation, with a sample yarn length of 20 cm and a tensile speed of 20 cm / min. The strength and elongation when the sample was stretched and fractured were measured. In addition, the strength and elongation product was determined from the following formula from these values. In view of the post-process and durability, the high elongation product is preferably 20 or more, more preferably 22 or more.
ＪＩＳ−Ｌ−１０１３に準じ、熱水収縮率を求めた。
＜繊維の導電性評価（線抵抗値）＞
線抵抗値は、導電性複合繊維を１０ｃｍ採取し、その両端に導電性接着剤でアルミ箔を接着させ、ヒューレットパッカード製ハイレジスタンスメーター４３３９Ｂを用いて測定した。
＜サンプル生地の作製＞
導電性複合繊維を５６ｄｔｅｘ／２４ｆのポリエチレンテレフタレート繊維にカバリングしたカバリング糸を８ｍｍピッチで経糸に用い、その他の経糸及び緯糸は８４ｄｔｅｘ／３６ｆのポリエチレンテレフタレート繊維とし、タフタを作製し、７０℃の弱アルカリ性精練液にて精練し、１３０℃で染色し、乾燥した後１６０℃で熱セットしてサンプル生地とした。
＜シワの評価＞
サンプル生地を平坦な台の上に載せて光源を横方向から当てることにより目視でシワ不良の評価を行った。
シワのないものは○、軽度のシワがみられるものは△、強いシワがみられるものは×と評価した。
The hot water shrinkage was determined according to JIS-L-1013.
<Evaluation of fiber conductivity (wire resistance)>
The line resistance value was measured using a high resistance meter 4339B manufactured by Hewlett Packard after collecting 10 cm of the conductive conjugate fiber, bonding an aluminum foil to the both ends with a conductive adhesive.
<Preparation of sample fabric>
Covering yarn obtained by covering conductive composite fiber with 56 dtex / 24f polyethylene terephthalate fiber is used as warp yarn at 8mm pitch, and other warp and weft yarns are 84 dtex / 36f polyethylene terephthalate fiber to make taffeta, weakly alkaline at 70 ° C After scouring with a scouring solution, dyed at 130 ° C., dried and then heat-set at 160 ° C. to obtain a sample dough.
<Evaluation of wrinkles>
The sample fabric was placed on a flat table and a light source was applied from the lateral direction to visually evaluate the wrinkle defect.
A sample without wrinkles was evaluated as ◯, a sample with slight wrinkles was evaluated as Δ, and a sample with strong wrinkles was evaluated as ×.
〔実施例１〕
ポリアミド６に導電性カーボンブラックを３５質量％混練した樹脂組成物を鞘の導電層、ポリアミドＭＸＤ６（三菱ガス化学製ＭＸナイロン Ｓ−６０１１）を芯の非導電層とし、導電層が繊維表面全体に露出した芯鞘型複合繊維を形成する口金を用いて溶融複合紡糸機にて複合紡糸を行った。口金のホール数は２４ホールであり、吐出された複合繊維を８糸条に分け、１糸条を３フィラメントとし、油剤付与ガイド、ゴデットローラーを介し１５００ｍ／ｍｉｎで回転するボビンに未延伸糸として巻き取った。巻き取られた未延伸糸を延撚機にてフィードローラー、９０℃の予熱ローラー、１５０℃の熱セットローラーを介し、予熱ローラーと熱セットローラー間で破断伸度が３０〜８０％程度となるように回転速度差を付けて延伸させ、トラベラを介してパーンに巻き取り、２２ｄｔｅｘ／３ｆの導電性複合繊維の延伸糸を得た。尚、繊維横断面における非導電層／導電層の面積比率は８３．３／１６．７とした。
得られた導電性複合繊維は強伸度に優れたものとなり、後工程の通過性にも優れたものであった。また得られた導電性複合繊維を用いて、サンプル生地を作製した。得られたサンプル生地は、シワの発生がなく、品位に優れるものであった。
[Example 1]
A resin composition in which 35% by mass of conductive carbon black is kneaded with polyamide 6 is used as a sheath conductive layer, and polyamide MXD6 (Mitsubishi Gas Chemical Co., Ltd., MX nylon S-6011) is used as a core non-conductive layer. Composite spinning was performed with a melt composite spinning machine using a die forming an exposed core-sheath composite fiber. The number of holes in the base is 24 holes, the discharged conjugate fiber is divided into 8 yarns, 1 yarn is made into 3 filaments, and undrawn yarn is formed on a bobbin that rotates at 1500 m / min through an oil agent application guide and a godet roller Rolled up as The unstretched yarn that has been wound is passed through a feed roller, a preheating roller at 90 ° C., and a heat setting roller at 150 ° C. with a drawing machine, and the breaking elongation is about 30 to 80% between the preheating roller and the heat setting roller. Thus, the film was stretched with a difference in rotational speed as described above, and wound around a pan through a traveler to obtain a stretched yarn of 22 dtex / 3f conductive composite fiber. In addition, the area ratio of the nonconductive layer / conductive layer in the fiber cross section was 83.3 / 16.7.
The obtained conductive conjugate fiber was excellent in strength and elongation, and was excellent in passability in the subsequent process. A sample fabric was prepared using the obtained conductive conjugate fiber. The obtained sample fabric had no wrinkles and was excellent in quality.
〔実施例２〕
鞘の導電層をポリアミド１２とし、導電性カーボンブラックを３５質量％混練した樹脂組成物とした以外は、実施例１と同様の条件で２２ｄｔｅｘ／３ｆの導電性複合繊維の延伸糸を得た。繊維横断面における非導電層／導電層の面積比率は８３．３／１６．７とした。
得られた導電性複合繊維は強伸度に優れたものとなり、後工程の通過性にも優れたものであった。また得られた導電性複合繊維を用いて、サンプル生地を作製した。得られたサンプル生地は、シワの発生がなく、品位に優れるものであった。
[Example 2]
A stretched yarn of 22 dtex / 3f conductive conjugate fiber was obtained under the same conditions as in Example 1 except that the sheath conductive layer was polyamide 12 and the resin composition was kneaded with 35% by mass of conductive carbon black. The area ratio of non-conductive layer / conductive layer in the cross section of the fiber was 83.3 / 16.7.
The obtained conductive conjugate fiber was excellent in strength and elongation, and was excellent in passability in the subsequent process. A sample fabric was prepared using the obtained conductive conjugate fiber. The obtained sample fabric had no wrinkles and was excellent in quality.
〔実施例３〕
ポリアミド６に導電性カーボンブラックを３５質量％混練した樹脂組成物を芯の導電層、ポリアミドＭＸＤ６（三菱ガス化学製ＭＸナイロン Ｓ−６０１１）を鞘の非導電層とし、導電層が繊維表面全体に２点露出し、非導電層に挟まれる形のサンドイッチ芯鞘型複合繊維を形成する口金を用いて溶融複合紡糸機にて複合紡糸を行った。口金のホール数は２４ホールであり、吐出された複合繊維を４糸条に分け、１糸条を６フィラメントとし、油剤付与ガイド、ゴデットローラーを介し１０００ｍ／ｍｉｎで回転するボビンに未延伸糸として巻き取った。巻き取られた未延伸糸を延撚機にてフィードローラー、９０℃の予熱ローラー、１５０℃の熱セットローラーを介し、予熱ローラーと熱セットローラー間で破断伸度が３０〜８０％程度となるように回転速度差を付けて延伸させ、トラベラを介してパーンに巻きとり、２２ｄｔｅｘ／６ｆの導電性複合繊維の延伸糸を得た。尚、繊維横断面における非導電層／導電層の面積比率は９０．９／９．１とした。
得られた導電性複合繊維は強伸度に優れたものとなり、後工程の通過性にも優れたものであった。また得られた導電性繊維を用いて、サンプル生地を作製した。得られたサンプル生地は、シワの発生がなく、品位に優れるものであった。
Example 3
A resin composition obtained by kneading 35% by mass of conductive carbon black in polyamide 6 is used as a core conductive layer, and polyamide MXD6 (Mitsubishi Gas Chemical Co., Ltd., MX nylon S-6011) is used as a sheath non-conductive layer. Composite spinning was performed in a melt composite spinning machine using a die that forms a sandwich core-sheath composite fiber that is exposed at two points and sandwiched between non-conductive layers. The number of holes in the die is 24 holes, the discharged composite fiber is divided into 4 yarns, 1 yarn is made into 6 filaments, and undrawn yarn on a bobbin that rotates at 1000 m / min through an oil application guide and a godet roller Rolled up as The unstretched yarn that has been wound is passed through a feed roller, a preheating roller at 90 ° C., and a heat setting roller at 150 ° C. with a drawing machine, and the breaking elongation is about 30 to 80% between the preheating roller and the heat setting roller. As described above, the film was stretched with a rotational speed difference and wound around a pan through a traveler to obtain a stretched yarn of a conductive composite fiber of 22 dtex / 6f. The area ratio of non-conductive layer / conductive layer in the cross section of the fiber was 90.9 / 9.1.
The obtained conductive conjugate fiber was excellent in strength and elongation, and was excellent in passability in the subsequent process. Moreover, sample cloth was produced using the obtained conductive fiber. The obtained sample fabric had no wrinkles and was excellent in quality.
〔実施例４〕
非導電層をポリアミドＭＸＤ８（三菱ガス化学製ＭＸナイロン ＬＥＸＴＥＲ８０００）とした以外は、実施例３と同様の条件で２２ｄｔｅｘ／６ｆの導電性複合繊維の延伸糸を得た。
得られた導電性複合繊維は強伸度に優れたものとなり、後工程の通過性にも優れたものであった。また得られた導電性繊維を用いて、サンプル生地を作製した。得られたサンプル生地は、シワの発生がなく、品位に優れるものであった。
Example 4
A stretched yarn of 22 dtex / 6f conductive composite fiber was obtained under the same conditions as in Example 3 except that the non-conductive layer was polyamide MXD8 (Mitsubishi Gas Chemical Co., Ltd., MX nylon LEXTER 8000).
The obtained conductive conjugate fiber was excellent in strength and elongation, and was excellent in passability in the subsequent process. Moreover, sample cloth was produced using the obtained conductive fiber. The obtained sample fabric had no wrinkles and was excellent in quality.
〔比較例１〕
ポリアミド６に導電性カーボンブラックを３５質量％混練した樹脂組成物を鞘の導電層、ポリアミド６（ηｒ＝３．３７）を芯の非導電層とし、導電層が繊維表面全体に露出した芯鞘型複合繊維を形成する口金を用いて溶融複合紡糸機にて複合紡糸を行った。口金のホール数は２４ホールであり、吐出された複合繊維を８糸条に分け、１糸条を３フィラメントとし、油剤付与ガイド、ゴデットローラーを介し１５００ｍ／ｍｉｎで回転するボビンに未延伸糸として巻き取った。巻き取られた未延伸糸を延撚機にてフィードローラー、１１５℃の予熱ローラー、１３０℃の熱セットローラーを介し、予熱ローラーと熱セットローラー間で破断伸度が３０〜８０％程度となるように回転速度差を付けて延伸させ、トラベラを介してパーンに巻きとり、２２ｄｔｅｘ／３ｆの導電性複合繊維の延伸糸を得た。尚、繊維横断面における非導電層／導電層の面積比率は８３．３／１６．７とした。
得られた導電性複合繊維は強伸度に優れたものとなった。これを用いて、サンプル生地を作製した。得られたサンプル生地は、シワが発生し、波打ったものとなった。
[Comparative Example 1]
A core sheath in which a resin composition obtained by kneading 35% by mass of conductive carbon black in polyamide 6 is used as a sheath conductive layer, and polyamide 6 (ηr = 3.37) is a core non-conductive layer, and the conductive layer is exposed on the entire fiber surface. Composite spinning was performed with a melt composite spinning machine using a die for forming a mold composite fiber. The number of holes in the base is 24 holes, the discharged conjugate fiber is divided into 8 yarns, 1 yarn is made into 3 filaments, and undrawn yarn is formed on a bobbin that rotates at 1500 m / min through an oil agent application guide and a godet roller Rolled up as The unstretched yarn that has been wound is passed through a feed roller, a 115 ° C. preheat roller, and a 130 ° C. heat set roller with a twister, and the breaking elongation is about 30 to 80% between the preheat roller and the heat set roller. Thus, the film was stretched with a difference in rotational speed as described above, and wound on a parn through a traveler to obtain a stretched yarn of 22 dtex / 3f conductive conjugate fiber. In addition, the area ratio of the nonconductive layer / conductive layer in the fiber cross section was 83.3 / 16.7.
The obtained conductive conjugate fiber was excellent in strength and elongation. Using this, a sample fabric was prepared. The obtained sample fabric was wrinkled and wavy.
〔比較例２〕
非導電層をポリアミド６（ηｒ＝２．５８）とした以外は、比較例１と同様の条件で２２ｄｔｅｘ／３ｆの導電性複合繊維の延伸糸を得た。
得られた導電性複合繊維を用いて、サンプル生地を作製した。得られたサンプル生地は、軽度のシワがみられた。
[Comparative Example 2]
A drawn yarn of 22 dtex / 3f conductive composite fiber was obtained under the same conditions as in Comparative Example 1 except that the non-conductive layer was polyamide 6 (ηr = 2.58).
A sample fabric was prepared using the obtained conductive conjugate fiber. The obtained sample fabric had slight wrinkles.
〔比較例３〕
非導電層をポリアミド６６（ηｒ＝２．８０）とした以外は、比較例１と同様の条件で２２ｄｔｅｘ／３ｆの導電性複合繊維の延伸糸を得た。
得られた導電性複合繊維を用いて、サンプル生地を作製した。得られたサンプル生地は、軽度のシワがみられた。
[Comparative Example 3]
A drawn yarn of 22 dtex / 3f conductive composite fiber was obtained under the same conditions as in Comparative Example 1 except that the non-conductive layer was polyamide 66 (ηr = 2.80).
A sample fabric was prepared using the obtained conductive conjugate fiber. The obtained sample fabric had slight wrinkles.
〔比較例４〕
非導電層をポリアミド６６（ηｒ＝３．８０）とした以外は、比較例１と同様の条件で２２ｄｔｅｘ／３ｆの導電性複合繊維の延伸糸を得た。
得られた導電性複合繊維を用いて、サンプル生地を作製した。得られたサンプル生地は、軽度のシワがみられた。
実施例及び比較例で得られた導電性複合繊維の構成と、糸質物性を表１に、導電性複合繊維を用いて作製したサンプル生地のシワの評価を表２に示す。
[Comparative Example 4]
A drawn yarn of 22 dtex / 3f conductive composite fiber was obtained under the same conditions as in Comparative Example 1 except that the non-conductive layer was polyamide 66 (ηr = 3.80).
A sample fabric was prepared using the obtained conductive conjugate fiber. The obtained sample fabric had slight wrinkles.
Table 1 shows the structures and properties of the conductive composite fibers obtained in Examples and Comparative Examples, and Table 2 shows the evaluation of wrinkles of sample fabrics made using the conductive composite fibers.
表１、表２の結果より、本発明の実施例から得られた複合繊維は、導電性、強伸度及び寸法安定性に優れた導電性複合繊維であった。このため、耐久性及び工程通過性に優れ、更にポリエステルと混用し、布帛とした際にシワが生じないものであった。 From the results of Tables 1 and 2, the composite fibers obtained from the examples of the present invention were conductive composite fibers excellent in conductivity, high elongation and dimensional stability. For this reason, it was excellent in durability and process passability, and was not mixed with polyester to produce wrinkles.
本発明の導電性複合繊維は、強伸度とそれに伴う耐久性及び工程通過性、また導電性に優れ、更に生地加工の際に寸法安定性に優れる。そのため、クリーンルーム用の防塵衣、作業衣等に好適に用いることができる。 The conductive conjugate fiber of the present invention is excellent in high elongation, durability associated with it, process passability, and electrical conductivity, and also in dimensional stability during fabric processing. Therefore, it can be suitably used for dustproof clothes, work clothes, etc. for clean rooms.
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