JP3635581B2 - Sustained release core-sheath composite short fiber - Google Patents
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Description
【０００１】
【産業上の利用分野】
本発明は徐放性芯鞘型複合短繊維に関する。詳細には、本発明は、染色、洗濯および各種後加工などを経ても徐放性成分の放出能が失われたり低下せず、長期間に亙って高い徐放性能を維持することのできる芯鞘型複合短繊維に関する。
【０００２】
【従来の技術】
特定の化合物の徐放性を利用した繊維製品の代表例としては芳香繊維がある。例えば、特開昭６１−２０１０１２号公報や特開昭６２−８５０１０号公報には天然精油を含有させたポリオレフィンの芯部を繊維の中空部分に配した中空芯鞘型繊維および中空芯鞘型複合繊維が開示されており、また特開平３−７６８１５号公報には、精油を含有させたα−オレフィン重合体または変性オレフィン重合体を芯部とした中実芯鞘型複合短繊維が開示されている。しかし、これら従来の徐放性繊維では、芳香油の徐放効果が持続せず、後加工や短期間の使用により芳香性が低下してしまうという欠点があり、その改善が望まれている。
【０００３】
また、防虫作用や防ダニ作用を有する有機薬剤をマイクロカプセル化し、このマイクロカプセルを用いて繊維を後加工して防虫または防ダニ効果を繊維に付与することも試みられているが、この場合は後加工によるために染色や洗濯などによってその性能が著しく低下し、持続性のある防虫または防ダニ繊維が得られない。
【０００４】
【発明が解決しようとする課題】
本発明の課題は、染色加工や水洗などの後加工や後処理、洗濯、長期間の着用や使用などを経た後も、徐放性が失われず、例えば芳香油、防虫剤や防ダニ剤、その他の健康作用を有する薬剤、天然オイルなどの徐放性成分を高い状態で徐々に放出できる繊維およびそれからなる繊維製品を提供することである。
【０００５】
【課題を解決するための手段】
本発明者らが上記の課題を解決すべく繊維の種類や配合成分の種類、製造面などから種々検討を重ねてきた。その結果、揮発性の徐放性成分を多孔性物質に保持させ、それを低融点の熱可塑性重合体に含有させたものを芯部とし、その周囲をそれよりも融点の高い熱可塑性の繊維形成性重合体からなる鞘部で包囲して芯鞘型複合繊維を形成し、それを短繊維状にして用いると、耐久性のある徐放性を有する上記の課題に合致した繊維が得られることを見出して本発明を完成した。
【０００６】
したがって、本発明は、熱可塑性の繊維形成性重合体からなる鞘部、および揮発性の徐放性成分を保持させた平均粒径０．０１〜３μのシリカまたはゼオライトからなる多孔性物質を含有する前記繊維形成性重合体よりも融点の低い熱可塑性の低融点重合体からなる芯部よりなり、且つ短繊維状をなすことを特徴とする徐放性芯鞘型複合短繊維である。
更に、本発明は前記した徐放性芯鞘型複合短繊維から製造された繊維製品を包含する。
（以下、本発明の徐放性芯鞘型複合短繊維を「複合繊維」、「芯鞘型複合繊維」または「徐放性芯鞘型複合繊維」ということがある。）
【０００７】
本発明において、鞘部を構成する繊維形成性重合体としては、繊維形成性能を有する熱可塑性重合体がよく、例えば繊維形成性のポリエステル、ポリアミド、ポリプロピレンなどのポリオレフィン、塩化ビニル、塩化ビニリデン等を挙げることができ、そのうちでもポリエステル、ポリアミド、ポリオレフィン、特にポリエステルが好ましい。ポリエステルの場合は、ポリエチレンテレフタレート、ポリブチレンテレフタレート、共重合成分を含むポリエチレンテレフタレートやポリブチレンテレフタレートなどを挙げることができ、これらに限らず繊維形成性のポリエステルはいずれも使用できる。
本発明の芯鞘型複合繊維では、上記のような繊維形成性重合体からなる鞘部が低融点重合体からなる芯部を包囲し保護しているので、芯部の機械的特性が多少低かったり、芯部を構成する重合体が多少繊維形成性に欠けている場合であっても、紡糸時の工程性が良好であり、しかも繊維全体として良好な形状保持性、物理的・機械的・化学的特性を有する優れた複合繊維を得ることができる。
【０００８】
また、芯部を構成する低融点重合体としては、鞘部を形成する上記した繊維形成性重合体よりも融点が低い熱可塑性重合体を使用するのがよい。その場合に、鞘部を構成する繊維形成性重合体と芯部を構成する低融点重合体は同じ種類の重合体であっても、または異なる重合体であってもよい。芯部を構成する低融点重合体の例としては、ポリエチレン、エチレン−酢酸ビニル共重合体、低融点ポリプロピレンなどの低融点オレフィン系重合体、低融点ポリエステル、低融点ポリアミドなどを挙げることができ、例えばポリエステルからなる鞘部に対して低融点ポリオレフィン、低融点ポリエステルまたは低融点ポリアミドからなる芯部を組み合わせて本発明の複合繊維を製造することができる。
【０００９】
本発明の複合繊維では、鞘部を構成する繊維形成性重合体と芯部を構成する低融点重合体の割合は特に限定されず、繊維の用途などに応じて種々調節することができるが、通常、重量比で鞘部用繊維形成性重合体：芯部用低融点重合体＝１：０．２５〜１．５になるように両者を複合紡糸するのが、紡糸時の工程性、得られる複合繊維の機械的強度などの物性、徐放性能などの点から好ましい。
【００１０】
そして、本発明では芯部を構成する低融点重合体中に多孔性物質に保持された徐放性成分を含有させるが、徐放性成分としては、沸点が比較的低くて空気中に徐々に揮発する徐放性能を有する物質であればいずれでもよく、繊維の用途などに応じて徐放性成分の種類を適宜選択することができる。徐放性成分の代表例としては、樹木の香りを放ついわゆる森林浴繊維に用いられる天然精油や香料が挙げられ、こられのほとんどが２００℃以下の沸点を有し、空気中に徐々に揮散してゆく。またそれ以外にも、花や果物などの香りのする揮発性の香料、揮発性を有する防虫・防ダニ剤、殺菌剤、殺カビ剤などを挙げることができる。
【００１１】
本発明では、揮発性の徐放性成分を保持させる多孔性物質としてシリカまたはゼオライトを用いる。該多孔性物質の平均粒径は０．０１〜３μの範囲にあり、０．０１〜１μであるのが好ましい。多孔性物質の平均粒径が０．０１μよりも小さいと、熱による凝集によって紡糸工程でのフィルターの目詰まりの恐れがあり、一方３μよりも大きいと、やはり紡糸時にフィルターの目詰まりや断糸等を生じて紡糸時の工程性が不良になり易く、延伸工程での毛羽の発生やローラーへの巻き付き、製品品質の低下などを生じ易い。
【００１２】
多孔性物質における徐放性成分の保持量は、徐放性成分の種類や多孔性物質の種類、繊維の用途などに応じて種々異なり得るが、一般に、多孔性物質と徐放性成分の合計重量に基づいて、徐放性成分を５〜６０重量％保持させるのがよい。徐放性成分の保持量が５重量％よりも少ないと、目的とする徐放性を発揮しにくくなり、一方６０重量％よりも多いと、徐放性成分を保持させた多孔性物質を、芯部を構成する低融点重合体中に均一に混合分散させにくくなる。
【００１３】
また、徐放性成分を保持した多孔性物質（以後「徐放性成分保持多孔性物質」という）は、低融点重合体と徐放性成分保持多孔性物質の合計重量に基づいて、５０重量％以下の割合で低融点重合体中に配合にするのが好ましく、１０重量％以下であるのがより好ましい。該多孔性物質の配合量が５０重量％を超えると、複合繊維を製造する際の芯部分の曵糸性が低下して紡糸が不安定なり、場合によっては得られる複合繊維の強度などの物性が低下する。
また、その際の徐放性成分の含有割合は、芯部を構成する低融点重合体組成物の全重量に基づいて０．１〜２０重量％程度になるようにするのが好ましい。
【００１４】
徐放性成分保持多孔性物質の低融点重合体中への添加方法は特に制限されず、徐放性成分保持多孔性物質を低融点重合体中に均一に混合分散させ得る方法であればいずれも採用できるが、徐放性成分保持多孔性物質を高濃度で含有する低融点重合体のマスターバッチやマスターチップを予め製造しておき、このマスターバッチやマスターチップを残部の低融点重合体と混合するのが均一な混合物を得る上で好ましい。
【００１５】
また、本発明の複合繊維における鞘部および芯部は、必要に応じて有機重合体繊維に通常使用されている紫外線吸収剤、酸化防止剤、滑剤、難燃剤、可塑剤、染顔料などの他の添加剤を含有していてもよい。
【００１６】
本発明の徐放性芯鞘型複合繊維は、熱可塑性重合体を用いて複合繊維を製造する従来公知の製造方法により製造することができ、その製法は特に制限されない。また本発明の繊維には捲縮、交絡、混繊、流体撹乱加工、染色などの種々の加工を必要に応じて施すことができる。
【００１７】
そして、本発明の徐放性芯鞘型複合繊維の断面形状に制限はなく、例えば、丸断面の他に、偏平断面、ドッグボーン断面、Ｔ型断面、Ｖ型断面、３〜６角形断面、３〜１４葉断面まどの異形断面など任意の断面形状とすることができる。
また、本発明の徐放性芯鞘複合繊維の太さは特に制限されず、各々の用途に適した太さとするとよい。
【００１８】
本発明の徐放性芯鞘型複合繊維はステープルなどの短繊維状をなしている。本発明の徐放性芯鞘型複合繊維は、短繊維状をなしていることによって、その切断された両端部において徐放性成分保持多孔性物質を含有する低分子量重合体の芯部が外部にむき出した状態になり、その部分から徐放性成分が徐々に放出されるので、繊維製品に高い徐放性成分を付与することができる。本発明の徐放性芯鞘型複合短繊維において、鞘部を形成する繊維形成性重合体としてポリエステルのような徐放性成分の通しにくい重合体を使用し、それを厚めの層状にして芯鞘型複合繊維を形成した場合には、短繊維状に切断する前の複合繊維フィラメントの紡糸、延伸、捲縮加工などの工程を、徐放性成分の放出を抑制しながら実施することができ、得られた複合フィラメントを短繊維状に切断した時点で初めて繊維に高い徐放性を付与することができる。
【００１９】
本発明の徐放性芯鞘型複合繊維の用途としては、例えば徐放性成分として森林浴香料やその他の香料を使用した場合には、布団、クッション、縫いぐるみなどの詰め綿、テーブルクロス、カーペット、カーテン、衣類などを挙げることができる。また、徐放性成分が防虫、防ダニ、抗菌性成分などの場合は、上記した用途と共に、各種衛生用品などに使用できる。本発明の芯鞘型複合繊維を使用する場合は、上記したように、短繊維状にカットし、それをそのまま綿状で使用したり、短繊維から紡績糸をつくってその紡績糸から編織物を製造したり、短繊維から不織布を製造して用いるのが、徐放性を増すことができ好ましい。
【００２０】
【実施例】
以下に実施例および比較例により本発明を具体的に説明するが本発明はそれにより限定されない。以下の実施例および比較例において、ポリエステルの極限粘度の測定、また得られる原綿の芳香性の評価は下記のようにして行った。
【００２１】
極限粘度の測定
フェノールおよびテトラクロロエタンの混合溶媒（重量比１：１）中で３０℃で測定した。
【００２２】
原綿の芳香性の評価
原綿の芳香性を、その製造直後、１００℃で５時間加熱後および室温（２５℃）で１カ月放置後に、その各々の芳香性を鼻でかいで点数評価した。なお点数評価は、芳香原綿の製造直後の匂いの強さを５点とし、匂いが感じられなくなった場合を１点として、匂いの強さを５段階にわけて行った。
【００２３】
《実施例 １》
（１） 天然精油（青森ヒバより抽出した精油）を、シリカと天然精油の合計重量に基づいて５０重量％の割合で保持したシリカ（平均粒径０．０３μ）を低密度ポリエチレン（ＭＩ＝５０）に含有させたポリエチレンマスターチップを２２０℃の混練温度で製造し、これに高密度ポリエチレン（ＭＩ＝２０）を加えて希釈して、芯部用ポリエチレン組成物の全重量に基づいて、天然精油分を４重量％の割合で含有する芯部用ポリエチレン組成物を製造した。
（２） ポリエチレンテレフタレート（極限粘度［η］＝０．６３）を鞘部として用いて、鞘部と芯部とを５０：５０の重量割合で複合繊維用紡糸装置に供給して、吐出量６００ｇ、巻取り速度６００ｍ／分、紡糸温度２８５℃で紡糸して、ポリエチレンテレフタレートの鞘部と天然精油保持シリカを含有するポリエチレンの芯部からなる断面丸型の芯鞘型複合繊維を製造した。この複合繊維を常法にしたがって延伸、捲縮、熱処理した後、切断して単繊維繊度６デニール、カット長５１ｍｍの短繊維原綿を得た。
（３） この原綿を用いて上記した芳香性の試験を行ったところ、下記の表１に示すとおりの結果を得た。
【００２４】
《比較例 １》
天然精油２０重量％を含有させたエチレン−酢酸ビニル共重合体２０重量部と高密度ポリエチレン（ＭＩ＝２０）８０重量部とをチップブレンドしたものを芯部用ポリエステル組成物として用いた他は実施例１と同様にしてポリエチレンテレフタレートからなる鞘部と天然精油を含有するポリエチレン／エチレン−酢酸ビニル共重合体混合物の芯部とからなる芯鞘型複合繊維を製造し、同様にしてカットされた短繊維原綿を製造した。この原綿を用いて上記した芳香性の試験を行ったところ、下記の表２に示すとおりの結果を得た。ちなみに、この比較例１において天然精油を有するマスターチップを低密度ポリエチレンではなくエチレン−酢酸ビニル共重合体を使用して製造したのは、低密度ポリエチレンに比べてエチレン−酢酸ビニル共重合体の方が天然精油との親和性が良いためである。
【００２５】
【表１】
上記表１の結果から、天然精油からなる揮発性の徐放性成分をシリカよりなる多孔性物質に保持させて芯部を構成するポリエチレン中に配合している実施例１の芯鞘型複合短繊維では、天然精油の徐放性が２カ月経過後も良好に保たれていること、これに対して天然精油を直接そのまま芯部を構成するポリエチレン／エチレン−酢酸ビニル共重合体混合物中に配合している比較例１の芯鞘型複合短繊維では、その徐放性能が短期間のうちに低下することがわかる。
【００２７】
【発明の効果】
本発明の徐放性芯鞘型複合短繊維では、揮発性の徐放性成分を、平均粒径が０．０１〜３μの範囲のシリカまたはゼオライトからなる多孔性物質に保持させて、芯部を構成する熱可塑性の低融点重合体中に配合していることにより、染色などの後処理、洗濯、着用や使用などを経ても、例えば香料、防虫・防ダニ剤、抗菌剤などの揮発性の徐放性成分の放出能が短期間に失われたり低下したりせずに、徐放性成分を高い割合で長期間に亙って放出することができる。
本発明の徐放性芯鞘型複合短繊維では、熱可塑性の繊維形成性重合体からなる鞘部が、該繊維形成性重合体よりも融点の低い熱可塑性の低融点重合体からなる芯部を完全に包囲し保護しているので、芯部の機械的特性が多少低かったり、芯部を構成する重合体が多少繊維形成性に欠けている場合であっても、紡糸時の工程性が良好であり、しかも繊維全体として良好な形状保持性、物理的・機械的・化学的特性を有する。
本発明の徐放性芯鞘型複合繊維は短繊維状をなしているため、その切断された両端部において徐放性成分保持多孔性物質を含有する低分子量重合体の芯部が外部にむき出した状態になり、その部分から揮発性の徐放性成分が徐々に放出され、繊維製品に高い徐放性能を付与することができる。
特に、鞘部を形成する熱可塑性の繊維形成性重合体としてポリエステルのような徐放性成分の通しにくい重合体を使用し、それを厚めの層状にして芯部を完全に包囲してなる本発明の徐放性芯鞘型複合短繊維では、短繊維状に切断する前の複合繊維フィラメントの紡糸、延伸、捲縮加工などの工程を、徐放性成分の放出を抑制しながら実施することができ、得られた複合繊維を短繊維状に切断した時点で繊維に高い徐放性能を付与することができる。[0001]
[Industrial application fields]
The present invention relates to a sustained-release core-sheath type composite short fiber. Specifically, the present invention does not lose or decrease the ability to release sustained-release components even after dyeing, washing and various post-processing, and can maintain high sustained-release performance over a long period of time. The present invention relates to a core-sheath type composite short fiber.
[0002]
[Prior art]
A typical example of a fiber product utilizing the sustained release of a specific compound is an aromatic fiber. For example, JP-A-61-201012 and JP-A-62-85010 disclose a hollow core-sheath type fiber and a hollow core-sheath type composite in which a core of a polyolefin containing natural essential oil is arranged in a hollow part of the fiber. Japanese Patent Laid-Open No. 3-76815 discloses a solid core-sheath type composite short fiber having an α-olefin polymer or modified olefin polymer containing an essential oil as a core. Yes. However, these conventional sustained-release fibers have the disadvantage that the sustained-release effect of the fragrance oil does not last, and the fragrance is lowered by post-processing or short-term use, and an improvement is desired.
[0003]
In addition, it has been attempted to microencapsulate an organic agent having an insecticidal action and an acaricidal action, and post-process the fiber using this microcapsule to impart an insecticidal or anticidic effect to the fiber. Due to post-processing, the performance is remarkably lowered by dyeing or washing, and a durable insect-proof or tick-proof fiber cannot be obtained.
[0004]
[Problems to be solved by the invention]
The problem of the present invention is that the sustained release is not lost even after post-processing and post-treatment such as dyeing and washing, washing, long-term wearing and use, such as aromatic oils, insecticides and acaricides, Another object of the present invention is to provide a fiber capable of gradually releasing a sustained release component such as a drug having other health effects and natural oil in a high state and a fiber product comprising the same.
[0005]
[Means for Solving the Problems]
In order to solve the above-mentioned problems, the present inventors have made various studies from the viewpoints of the types of fibers, the types of blending components, and the manufacturing aspects. As a result, a volatile sustained-release component is retained in a porous material, and the core portion is made of a thermoplastic polymer having a low melting point, and the periphery thereof is a thermoplastic fiber having a higher melting point. When a core-sheath type composite fiber is formed by being surrounded by a sheath made of a formable polymer and used in the form of a short fiber, a fiber that meets the above-mentioned problems with durable sustained release can be obtained. As a result, the present invention was completed.
[0006]
Accordingly, the present invention may contain a porous substance composed of a thermoplastic fiber-forming sheath made of polymer, and a volatile silica or zeolite having an average particle size of 0.01~3μ obtained by holding the controlled release component A sustained-release core-sheath composite short fiber comprising a core portion made of a thermoplastic low-melting-point polymer having a lower melting point than the fiber-forming polymer and having a short fiber shape.
Furthermore, the present invention includes a fiber product produced from the above-mentioned sustained release core-sheath type composite short fiber.
(Hereinafter, the sustained-release core-sheath type composite short fiber of the present invention may be referred to as “composite fiber”, “core-sheath type composite fiber” or “sustained-release core-sheath type composite fiber”.)
[0007]
In the present invention, the fiber-forming polymer constituting the sheath is preferably a thermoplastic polymer having fiber-forming performance, such as polyolefins such as fiber-forming polyester, polyamide, and polypropylene, vinyl chloride, vinylidene chloride, and the like. Among them, polyester, polyamide, polyolefin, particularly polyester is preferable. In the case of polyester, polyethylene terephthalate, polybutylene terephthalate, polyethylene terephthalate containing a copolymer component, polybutylene terephthalate, and the like can be used, and not limited to these, any fiber-forming polyester can be used.
In the core-sheath type composite fiber of the present invention, the sheath part made of the fiber-forming polymer as described above surrounds and protects the core part made of the low melting point polymer, so that the mechanical properties of the core part are somewhat low. Even if the polymer constituting the core part is somewhat lacking in fiber forming properties, the processability at the time of spinning is good, and the shape of the whole fiber is good, physical / mechanical, An excellent composite fiber having chemical characteristics can be obtained.
[0008]
Further, as the low melting point polymer constituting the core part, it is preferable to use a thermoplastic polymer having a melting point lower than that of the above-mentioned fiber-forming polymer forming the sheath part. In that case, the fiber-forming polymer constituting the sheath part and the low melting point polymer constituting the core part may be the same type of polymer or different polymers. Examples of the low-melting point polymer constituting the core can include polyethylene, ethylene-vinyl acetate copolymer, low-melting point olefin polymers such as low-melting point polypropylene, low-melting point polyester, low-melting point polyamide, For example, the composite fiber of the present invention can be produced by combining a core portion made of low melting point polyolefin, low melting point polyester or low melting point polyamide with a sheath portion made of polyester.
[0009]
In the composite fiber of the present invention, the ratio of the fiber-forming polymer constituting the sheath part and the low melting point polymer constituting the core part is not particularly limited and can be variously adjusted according to the use of the fiber, In general, the fiber-forming polymer for the sheath part: the low-melting polymer for the core part is 1: 0.25 to 1.5 in a weight ratio, and the two are subjected to compound spinning, so that the processability at the time of spinning is obtained. From the viewpoints of physical properties such as mechanical strength and sustained release performance of the composite fiber obtained.
[0010]
In the present invention, the low-melting polymer constituting the core contains the sustained-release component held in the porous material. As the sustained-release component, the boiling point is relatively low, and the polymer is gradually introduced into the air. Any substance can be used as long as it volatizes and has a sustained release performance, and the type of the sustained release component can be appropriately selected according to the use of the fiber. Typical examples of sustained-release components include natural essential oils and fragrances used in so-called forest bath fibers that give off the scent of trees, most of which have a boiling point of 200 ° C. or less and gradually evaporate in the air. Go. In addition, other examples include volatile fragrances such as flowers and fruits, volatile insecticides / acaricides, fungicides, fungicides, and the like.
[0011]
In the present invention, silica or zeolite is used as a porous material for retaining a volatile sustained-release component. The average particle diameter of the porous material is in the range of 0.01 to 3 μm, and preferably 0.01 to 1 μm. If the average particle size of the porous material is smaller than 0.01μ, there is a risk of clogging of the filter in the spinning process due to heat aggregation. On the other hand, if it is larger than 3μ, the filter is clogged or broken during spinning. And the like, the processability at the time of spinning tends to be poor, and the generation of fuzz in the stretching process, the winding around the roller, and the deterioration of the product quality are likely to occur.
[0012]
The amount of sustained-release component retained in the porous material may vary depending on the type of sustained-release component, the type of porous material, the use of the fiber, etc., but generally the total of the porous material and the sustained-release component It is preferable to hold 5 to 60% by weight of the sustained release component based on the weight. When the amount of the sustained-release component is less than 5% by weight, it becomes difficult to exert the desired sustained-release property, while when it is more than 60% by weight, the porous material holding the sustained-release component is obtained. It becomes difficult to uniformly mix and disperse in the low melting point polymer constituting the core.
[0013]
Further, the porous material holding the sustained-release component (hereinafter referred to as “sustained-release component-holding porous material”) is 50% based on the total weight of the low melting point polymer and the sustained-release component-holding porous material. % Is preferably blended in the low melting point polymer, more preferably 10% by weight or less. If the amount of the porous material exceeds 50% by weight, the spinnability of the core part during the production of the composite fiber is lowered and the spinning becomes unstable. In some cases, the physical properties such as the strength of the composite fiber obtained. Decreases.
Moreover, it is preferable to make it the content rate of the sustained release component in that case become about 0.1-20 weight% based on the total weight of the low melting-point polymer composition which comprises a core part.
[0014]
The method for adding the sustained-release component-holding porous material to the low-melting polymer is not particularly limited, and any method can be used as long as the sustained-release component-holding porous material can be uniformly mixed and dispersed in the low-melting polymer. However, a master batch or master chip of a low melting point polymer containing a sustained-release component-retaining porous substance at a high concentration is prepared in advance, and the master batch or master chip is used as the remaining low melting point polymer. Mixing is preferable for obtaining a uniform mixture.
[0015]
In addition, the sheath and core of the conjugate fiber of the present invention may be used in addition to UV absorbers, antioxidants, lubricants, flame retardants, plasticizers, dyes and pigments that are usually used for organic polymer fibers as necessary. The additive may be contained.
[0016]
The sustained-release core-sheath type conjugate fiber of the present invention can be produced by a conventionally known production method for producing a conjugate fiber using a thermoplastic polymer, and the production method is not particularly limited. The fiber of the present invention can be subjected to various processes such as crimping, entanglement, fiber mixing, fluid disturbance processing, and dyeing as required.
[0017]
And there is no restriction | limiting in the cross-sectional shape of the sustained release core-sheath-type composite fiber of this invention, For example, besides a round cross section, a flat cross section, a dogbone cross section, a T type cross section, a V type cross section, a 3-6 hexagon cross section, It can be set as arbitrary cross-sectional shapes, such as a 3-14 leaf cross section modified cross section.
Further, the thickness of the sustained-release core-sheath conjugate fiber of the present invention is not particularly limited, and may be a thickness suitable for each application.
[0018]
The sustained-release core-sheath composite fiber of the present invention has a short fiber shape such as staple. The sustained-release core-sheath-type conjugate fiber of the present invention has a short fiber shape, so that the core of the low molecular weight polymer containing the sustained-release component-holding porous material is externally provided at both cut ends. Since it is in a state of being exposed and the sustained-release component is gradually released from that portion, a high sustained-release component can be imparted to the fiber product. In the sustained-release core-sheath type composite short fiber of the present invention, a polymer that is difficult to pass a sustained-release component such as polyester is used as the fiber-forming polymer forming the sheath, and the core is made into a thick layer. When a sheath type composite fiber is formed, steps such as spinning, drawing and crimping of the composite fiber filament before cutting into a short fiber can be carried out while suppressing the release of the sustained release component. A high sustained release property can be imparted to the fiber only when the obtained composite filament is cut into short fibers.
[0019]
The use of the sustained-release core-sheath composite fiber of the present invention includes, for example, when a forest bath fragrance or other fragrance is used as a sustained-release component, padded cotton such as a futon, cushion, stuffed toy, table cloth, carpet, Examples include curtains and clothing. In addition, when the sustained-release component is an insect repellent, mite-proof, antibacterial component or the like, it can be used for various hygiene products and the like as described above. When the core-sheath type composite fiber of the present invention is used, as described above, it is cut into a short fiber shape and used as it is in a cotton shape, or a spun yarn is made from the short fiber and the knitted fabric is made from the spun yarn. It is preferable to produce a non-woven fabric or to use a non-woven fabric from short fibers because the sustained release property can be increased.
[0020]
【Example】
EXAMPLES The present invention will be specifically described below with reference to examples and comparative examples, but the present invention is not limited thereby. In the following Examples and Comparative Examples, measurement of the intrinsic viscosity of polyester and evaluation of the aromaticity of the obtained raw cotton were performed as follows.
[0021]
Measurement of intrinsic viscosity The intrinsic viscosity was measured at 30C in a mixed solvent of phenol and tetrachloroethane (1: 1 by weight).
[0022]
Evaluation of the fragrance of raw cotton The fragrance of raw cotton was scored by sniffing each fragrance immediately after production, after heating for 5 hours at 100 ° C and after standing for 1 month at room temperature (25 ° C). did. The score evaluation was performed by dividing the odor intensity into 5 levels, with the odor intensity immediately after the production of aromatic raw cotton as 5 points and the case where no odor was felt as 1 point.
[0023]
Example 1
(1) Low-density polyethylene (MI = 50) is a silica (average particle size of 0.03 μ) in which natural essential oil (essential oil extracted from Aomori Hiba) is retained at a ratio of 50% by weight based on the total weight of silica and natural essential oil. ) Is produced at a kneading temperature of 220 ° C., and high density polyethylene (MI = 20) is added to the polyethylene master chip for dilution. Based on the total weight of the core polyethylene composition, natural essential oil A polyethylene composition for the core containing 4% by weight of the component was produced.
(2) Using polyethylene terephthalate (intrinsic viscosity [η] = 0.63) as a sheath part, the sheath part and the core part are supplied to the spinning device for composite fibers at a weight ratio of 50:50, and the discharge amount is 600 g. Spinning was carried out at a winding speed of 600 m / min and a spinning temperature of 285 ° C. to produce a core-sheath composite fiber having a round cross section consisting of a polyethylene terephthalate sheath and a polyethylene core containing natural essential oil-retaining silica. This composite fiber was drawn, crimped, and heat-treated according to a conventional method, and then cut to obtain a short fiber raw cotton having a single fiber fineness of 6 denier and a cut length of 51 mm.
(3) When the above aromatic test was performed using this raw cotton, the results shown in Table 1 below were obtained.
[0024]
<< Comparative Example 1 >>
This was carried out except that 20 parts by weight of ethylene-vinyl acetate copolymer containing 20% by weight of natural essential oil and 80 parts by weight of high density polyethylene (MI = 20) were chip-blended and used as the polyester composition for the core. In the same manner as in Example 1, a core-sheath type composite fiber consisting of a sheath part made of polyethylene terephthalate and a core part of a polyethylene / ethylene-vinyl acetate copolymer mixture containing natural essential oil was produced and cut in the same manner. A fiber raw cotton was produced. When the above aromatic test was performed using this raw cotton, the results shown in Table 2 below were obtained. By the way, the master chip having the natural essential oil in Comparative Example 1 was manufactured using ethylene-vinyl acetate copolymer instead of low-density polyethylene. This is because of its good affinity with natural essential oils.
[0025]
[Table 1]
From the results in Table 1 above, the core-sheath type composite short of Example 1 in which a volatile sustained-release component made of natural essential oil is held in a porous material made of silica and blended in polyethylene constituting the core part. For fibers, the sustained release of natural essential oil is maintained well after 2 months, and natural essential oil is blended directly into the polyethylene / ethylene-vinyl acetate copolymer mixture that directly forms the core. It can be seen that the sustained-release performance of the core-sheath composite short fiber of Comparative Example 1 decreases in a short period of time.
[0027]
【The invention's effect】
In the sustained-release core-sheath composite short fiber of the present invention, the volatile sustained-release component is held in a porous material made of silica or zeolite having an average particle size in the range of 0.01 to 3 μm, and the core portion It is incorporated into the thermoplastic low-melting-point polymer constituting the volatile matter such as fragrances, insect repellents, acaricides and antibacterial agents even after post-treatment such as dyeing , washing, wearing and use. The sustained-release component can be released at a high rate over a long period of time without the ability to release the sustained-release component being lost or reduced in a short period of time.
In the sustained-release core-sheath type composite short fiber of the present invention, the sheath part made of a thermoplastic fiber-forming polymer has a core part made of a thermoplastic low-melting-point polymer having a lower melting point than the fiber-forming polymer. Since the mechanical properties of the core are somewhat low or the polymer constituting the core is somewhat lacking in fiber-forming properties, the processability during spinning is It has good shape and good overall shape retention and physical / mechanical / chemical properties.
Since the sustained-release core-sheath composite fiber of the present invention has a short fiber shape, the core portion of the low molecular weight polymer containing the sustained-release component-holding porous material is exposed to the outside at both cut ends. Thus, the volatile sustained-release component is gradually released from the portion, and high sustained-release performance can be imparted to the fiber product.
In particular, a thermoplastic fiber-forming polymer that forms a sheath part is made of a polymer that is difficult to pass through a slow-release component such as polyester, and is made into a thick layer to completely surround the core part. In the sustained-release core-sheath type composite short fiber of the invention, the steps of spinning, drawing, crimping and the like of the composite fiber filament before cutting into a short fiber shape should be carried out while suppressing the release of the sustained-release component. When the obtained composite fiber is cut into short fibers, high sustained release performance can be imparted to the fiber.
Claims (3)
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP13099593A JP3635581B2 (en) | 1993-05-10 | 1993-05-10 | Sustained release core-sheath composite short fiber |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP13099593A JP3635581B2 (en) | 1993-05-10 | 1993-05-10 | Sustained release core-sheath composite short fiber |
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| Publication Number | Publication Date |
|---|---|
| JPH06322612A JPH06322612A (en) | 1994-11-22 |
| JP3635581B2 true JP3635581B2 (en) | 2005-04-06 |
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| JP13099593A Expired - Fee Related JP3635581B2 (en) | 1993-05-10 | 1993-05-10 | Sustained release core-sheath composite short fiber |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR20160034485A (en) * | 2014-09-19 | 2016-03-30 | 강원대학교산학협력단 | Method for manufacturing core-sheath type composite fiber containing sustained-release functional substance and core-sheath type composite fiber manufactured thereby |
Families Citing this family (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH07292541A (en) * | 1994-04-20 | 1995-11-07 | Hagiwara Kogyo Kk | Carpet base fabric |
| KR100605352B1 (en) * | 1999-12-17 | 2006-07-28 | 삼성토탈 주식회사 | Manufacturing method of antiinsect film using porous inorganic material |
| CN100402715C (en) * | 2005-04-27 | 2008-07-16 | 天津工业大学 | Functional fiber and its manufacturing method |
| JP2008013508A (en) * | 2006-07-07 | 2008-01-24 | Sumitomo Chemical Co Ltd | Insect pest control material |
| KR100819250B1 (en) * | 2007-03-29 | 2008-04-03 | 주식회사 화승인더스트리 | Master batch for antiinsect film having antiinsect particle and antiinsect film having the same |
| US8061377B2 (en) * | 2007-06-29 | 2011-11-22 | Vestergaard Frandsen Sa | Insecticidal barrier with a durable lower part |
| KR101232496B1 (en) * | 2010-12-31 | 2013-02-15 | 주식회사 효성 | Method for Manufacturing Controlled-Release Skin-core Type Composite Fiber and Composite Fiber Made Thereof |
| JP6192395B2 (en) * | 2013-07-08 | 2017-09-06 | 株式会社クラレ | Sustained release composite fiber and method for producing the same |
| KR102209920B1 (en) * | 2019-06-10 | 2021-01-29 | 조대현 | Blended filament with excellent anti-insect property |
| KR102138114B1 (en) * | 2019-06-10 | 2020-08-13 | 조대현 | Conjugated filament with excellent anti-insect property |
| CN112342691B (en) * | 2019-10-25 | 2022-09-09 | 福建冠泓工业有限公司 | Elastic antibacterial non-woven fabric and manufacturing process thereof |
-
1993
- 1993-05-10 JP JP13099593A patent/JP3635581B2/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR20160034485A (en) * | 2014-09-19 | 2016-03-30 | 강원대학교산학협력단 | Method for manufacturing core-sheath type composite fiber containing sustained-release functional substance and core-sheath type composite fiber manufactured thereby |
| KR101634680B1 (en) * | 2014-09-19 | 2016-06-30 | 강원대학교산학협력단 | Method for manufacturing core-sheath type composite fiber containing sustained-release functional substance and core-sheath type composite fiber manufactured thereby |
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| JPH06322612A (en) | 1994-11-22 |
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