JP7125836B2 - Non-woven base material for electromagnetic wave shielding - Google Patents
Non-woven base material for electromagnetic wave shielding Download PDFInfo
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Description
本発明は、優れた電磁波シールド性を発現できる電磁波シールド材用不織布基材に関する。 TECHNICAL FIELD The present invention relates to a nonwoven fabric base material for an electromagnetic shielding material capable of exhibiting excellent electromagnetic shielding properties.
電子機器は電磁波を発生している。そして、電磁波を電子機器の外部に漏らさないようにするため、また、電磁波により電子機器が誤作動を起こさないようにするために、電磁波シールド材が使用されている。電磁波シールド材には、板金、金属を含む塗料、金属メッシュ、発泡金属等が挙げられる。近年の電子機器の小型化に伴い、薄い電磁波シールド材が求められており、ポリエステル系短繊維から形成される不織布に金属鍍金加工を施してなる電磁波シールド材が知られている（例えば、特許文献１）。 Electronic devices generate electromagnetic waves. Electromagnetic wave shielding materials are used to prevent electromagnetic waves from leaking to the outside of electronic devices and to prevent electronic devices from malfunctioning due to electromagnetic waves. Examples of electromagnetic wave shielding materials include sheet metal, paint containing metal, metal mesh, foam metal, and the like. With the recent miniaturization of electronic devices, there is a demand for thin electromagnetic shielding materials, and electromagnetic shielding materials made by subjecting a nonwoven fabric formed from polyester short fibers to metal plating are known (for example, patent documents 1).
特許文献１の実施例では、延伸ポリエステル系短繊維として、繊維径３μｍ及び７．４μｍの短繊維が使用されているが、薄い電磁波シールド材が求められるにつれ、電磁波シールド性が十分に確保できない問題があった。 In the examples of Patent Document 1, short fibers with fiber diameters of 3 μm and 7.4 μm are used as drawn polyester short fibers, but as thin electromagnetic shielding materials are required, there is a problem that sufficient electromagnetic shielding properties cannot be secured. was there.
本発明の課題は、優れた電磁波シールド性を発現できる電磁波シールド材用不織布基材を提供することにある。 An object of the present invention is to provide a nonwoven fabric base material for an electromagnetic shielding material that can exhibit excellent electromagnetic shielding properties.
本発明者らは、上記課題を解決するために鋭意研究した結果、湿式不織布が、繊維径が３．０μｍ未満の延伸ポリエステル系短繊維と繊維径が３．０μｍ以上５．０μｍ以下の未延伸ポリエステル系短繊維とを必須成分として含有し、繊維径が３．０μｍ未満の延伸ポリエステル系短繊維が繊度０．０６ｄｔｅｘの延伸ポリエチレンテレフタレート系短繊維であり、繊維径が３．０μｍ以上５．０μｍ以下の未延伸ポリエステル系短繊維が繊度０．２ｄｔｅｘの未延伸ポリエチレンテレフタレート系短繊維であり、繊度０．０６ｄｔｅｘの延伸ポリエチレンテレフタレート系短繊維の含有率が不織布基材を構成する繊維全体の２０～８０質量％であり、繊度０．２ｄｔｅｘの未延伸ポリエチレンテレフタレート系短繊維の含有率が不織布基材を構成する繊維全体の２０～８０質量％であることを特徴とする電磁波シールド材用不織布基材を見出した。 As a result of intensive research by the present inventors to solve the above problems, the wet-laid nonwoven fabric is composed of stretched polyester short fibers with a fiber diameter of less than 3.0 μm and unstretched fibers with a fiber diameter of 3.0 μm or more and 5.0 μm or less. The drawn polyester short fibers having a fiber diameter of less than 3.0 μm are drawn polyethylene terephthalate short fibers having a fineness of 0.06 dtex, and the fiber diameter is 3.0 μm or more and 5.0 μm. The following unstretched polyester short fibers are unstretched polyethylene terephthalate short fibers with a fineness of 0.2 dtex, and the content of the stretched polyethylene terephthalate short fibers with a fineness of 0.06 dtex is 20 to 20% of the total fibers constituting the nonwoven fabric substrate. 80% by mass, and the content of unstretched polyethylene terephthalate staple fibers having a fineness of 0.2 dtex is 20 to 80% by mass of the total fibers constituting the nonwoven fabric substrate. found the material.
本発明の電磁波シールド材用不織布基材によって、優れた電磁波シールド性を発現できる電磁波シールド材用不織布基材が提供される。 The nonwoven fabric base material for electromagnetic wave shielding materials of the present invention provides a nonwoven base material for electromagnetic wave shielding materials capable of exhibiting excellent electromagnetic wave shielding properties.
以下、本発明の電磁波シールド材用不織布基材について詳説する。本発明において、電磁波シールド材用不織布基材は、繊維径が３．０μｍ未満の延伸ポリエステル系短繊維と繊維径が３．０μｍ以上５．０μｍ以下の未延伸ポリエステル系短繊維とを必須成分として含有することを特徴としている。 The nonwoven fabric base material for electromagnetic shielding materials of the present invention will be described in detail below. In the present invention, the non-woven fabric base material for electromagnetic wave shielding material is composed of stretched polyester short fibers with a fiber diameter of less than 3.0 μm and unstretched polyester short fibers with a fiber diameter of 3.0 μm or more and 5.0 μm or less as essential components. It is characterized by containing
一般的に、電磁波シールド材用不織布基材の鍍金加工には無電解鍍金が用いられるが、無電解鍍金では、不織布を形成する繊維の比表面積（単位体積当たり表面積）が小さいと、単位体積当たりの金属の付着量が小さくなり、優れた電磁波シールド性を発現できない。繊維径が３．０μｍ未満の延伸ポリエステル系短繊維と繊維径が３．０μｍ以上５．０μｍ以下の未延伸ポリエステル系短繊維とを必須成分として含有する場合、比表面積を増やすことができ、優れた電磁波シールド性が発現できる。すなわち、電磁波シールド材用不織布基材が、繊維径が３．０μｍ以上の延伸ポリエステル系短繊維と繊維径が５．０μｍ超の未延伸ポリエステル系短繊維のみから成る場合では、優れた電磁波シールド性が発現できない。また、薄い電磁波シールド材が求められており、繊維径が小さいと電磁波シールド材としての強度が得られない場合がある。繊維径が３．０μｍ未満の延伸ポリエステル系短繊維と繊維径が３．０μｍ以上５．０μｍ以下の未延伸ポリエステル系短繊維とを含むことで、薄く強度のある電磁波シールド材用不織布基材を提供することが容易になる。 Generally, electroless plating is used for plating non-woven fabric substrates for electromagnetic wave shielding materials. The adhesion amount of the metal becomes small, and excellent electromagnetic wave shielding properties cannot be exhibited. When the stretched polyester short fibers with a fiber diameter of less than 3.0 μm and the unstretched polyester short fibers with a fiber diameter of 3.0 μm or more and 5.0 μm or less are contained as essential components, the specific surface area can be increased, which is excellent. electromagnetic wave shielding properties can be expressed. That is, when the non-woven fabric base material for electromagnetic wave shielding material consists only of stretched polyester short fibers with a fiber diameter of 3.0 μm or more and unstretched polyester short fibers with a fiber diameter of more than 5.0 μm, excellent electromagnetic shielding properties are obtained. cannot be expressed. In addition, thin electromagnetic wave shielding materials are required, and if the fiber diameter is small, strength as an electromagnetic wave shielding material may not be obtained. A thin and strong non-woven fabric substrate for electromagnetic wave shielding material is provided by containing stretched polyester short fibers with a fiber diameter of less than 3.0 μm and unstretched polyester short fibers with a fiber diameter of 3.0 μm or more and 5.0 μm or less. easier to provide.
本発明において、延伸ポリエステル系短繊維は、熱カレンダー処理によっても、溶融又は軟化しにくく、不織布基材の骨格を形成する主体繊維である。 In the present invention, the stretched polyester short fibers are the main fibers that are difficult to melt or soften even by heat calendering and form the skeleton of the nonwoven fabric base material.
本発明において、未延伸ポリエステル系短繊維は、熱カレンダー処理によって、溶融又は軟化し、不織布基材の強度を高めるバインダー繊維として機能する。未延伸ポリエステルの融点は、２２０℃～２５０℃が好ましい。未延伸ポリエステルの融点が２２０℃未満の場合、熱カレンダー処理時の熱ロールに不織布基材が貼り付いてしまい、シートにならない場合がある。２５０℃を超える場合、繊維が接着せずにシートの強度が発現しない場合がある。 In the present invention, the unstretched polyester short fibers are melted or softened by heat calendering and function as binder fibers that increase the strength of the nonwoven fabric substrate. The melting point of unstretched polyester is preferably 220°C to 250°C. If the unstretched polyester has a melting point of less than 220° C., the nonwoven fabric base material may stick to the hot roll during heat calendering and may not form a sheet. If the temperature exceeds 250°C, the fibers may not adhere to each other and the strength of the sheet may not be exhibited.
未延伸ポリエステル系短繊維の融点は、示差走査熱量測定装置にて窒素雰囲気で昇温速度１０℃／ｍｉｎ、２５℃から３００℃まで昇温した時のピーク温度である。 The melting point of unstretched polyester short fibers is the peak temperature when the temperature is raised from 25° C. to 300° C. at a temperature elevation rate of 10° C./min in a nitrogen atmosphere using a differential scanning calorimeter.
本発明において、電磁波シールド材用不織布基材は、繊維径が３．０μｍ未満の延伸ポリエステル系短繊維と繊維径が３．０μｍ以上５．０μｍ以下の未延伸ポリエステル系短繊維とを必須成分として含有する。繊維径が３．０μｍ未満の延伸ポリエステル系短繊維の繊維径は、０．１μｍ以上であることが好ましい。繊維径が０．１μｍ未満である場合、強度が発現しない場合がある。 In the present invention, the non-woven fabric base material for electromagnetic wave shielding material is composed of stretched polyester short fibers with a fiber diameter of less than 3.0 μm and unstretched polyester short fibers with a fiber diameter of 3.0 μm or more and 5.0 μm or less as essential components. contains. The fiber diameter of the drawn polyester short fibers having a fiber diameter of less than 3.0 µm is preferably 0.1 µm or more. If the fiber diameter is less than 0.1 μm, strength may not be exhibited.
本発明において、延伸ポリエステル系短繊維と未延伸ポリエステル系短繊維の質量含有比率は、２０：８０～８０：２０であることが好ましい。未延伸ポリエステル系短繊維の含有率が不織布基材を構成する繊維全体の２０質量％未満であると、基材として必要な強度が発現しなくなることがある。一方、未延伸ポリエステル系短繊維の含有率が８０質量％を超えると、均一性を損なう場合がある。 In the present invention, the mass content ratio of the stretched polyester short fibers and the unstretched polyester short fibers is preferably 20:80 to 80:20. If the content of the unstretched polyester short fibers is less than 20% by mass of the total fibers constituting the nonwoven fabric base material, the strength required for the base material may not be exhibited. On the other hand, if the content of unstretched polyester short fibers exceeds 80% by mass, uniformity may be impaired.
本発明において、繊維径が３．０μｍ未満の延伸ポリエステル系短繊維と繊維径が３．０μｍ以上５．０μｍ以下の未延伸ポリエステル系短繊維以外の繊維を使用しても良い。すなわち、繊維径が３．０μｍ以上の延伸ポリエステル系短繊維、繊維径が３．０μｍ未満や５．０μｍ超の未延伸ポリエステル系短繊維を使用しても良い。これらは、単独で使用しても良いし、２種類以上の繊維径の繊維を併用してもよい。 In the present invention, fibers other than stretched polyester staple fibers with a fiber diameter of less than 3.0 μm and unstretched polyester staple fibers with a fiber diameter of 3.0 μm or more and 5.0 μm or less may be used. That is, stretched polyester staple fibers with a fiber diameter of 3.0 μm or more and unstretched polyester staple fibers with a fiber diameter of less than 3.0 μm or more than 5.0 μm may be used. These may be used alone, or may be used in combination of fibers having two or more fiber diameters.
繊維径が３．０μｍ未満の延伸ポリエステル系短繊維については、その質量含有率は、含有する全延伸ポリエステル系短繊維中、１～１００質量％であることが好ましく、３～１００質量％であることがより好ましい。繊維径が３．０μｍ未満の延伸ポリエステル系短繊維の含有率が１質量％未満である場合、併用する繊維径によっては比表面積が小さくなり、優れた電磁波シールド性が発現し難くなる場合がある。 The mass content of the stretched polyester short fibers having a fiber diameter of less than 3.0 μm is preferably 1 to 100% by mass, more preferably 3 to 100% by mass, of the total stretched polyester short fibers contained. is more preferable. If the content of the stretched polyester short fibers with a fiber diameter of less than 3.0 μm is less than 1% by mass, the specific surface area may decrease depending on the fiber diameter used in combination, making it difficult to develop excellent electromagnetic shielding properties. .
また、繊維径が３．０μｍ以上５．０μｍ以下の未延伸ポリエステル系短繊維については、その質量含有率は、含有する全未延伸ポリエステル系短繊維中、１～１００質量％が好ましく、２～１００質量％がより好ましい。繊維径が３．０μｍ以上５．０μｍ以下の未延伸ポリエステル系短繊維の含有率が１質量％未満である場合、併用する繊維径によっては比表面積が小さくなり、優れた電磁波シールド性が発現し難くなる、または優れた不織布の強度が発現し難くなる場合がある。 In addition, for unstretched polyester short fibers having a fiber diameter of 3.0 μm or more and 5.0 μm or less, the mass content of the total unstretched polyester short fibers contained is preferably 1 to 100% by mass, and 2 to 100% by mass. 100% by mass is more preferred. If the content of unstretched polyester staple fibers with a fiber diameter of 3.0 μm or more and 5.0 μm or less is less than 1% by mass, the specific surface area may be reduced depending on the fiber diameter used in combination, resulting in excellent electromagnetic shielding properties. It may become difficult, or it may become difficult to develop excellent nonwoven fabric strength.
なお、ポリエステル系短繊維の繊維径は、顕微鏡で３０００倍の不織布基材断面の拡大写真を撮り、ポリエステル系短繊維の断面積を測定し、繊維の断面形状が真円として算出した直径であり、本発明では、１０本以上の繊維の算術平均値を求めた。 The fiber diameter of the polyester staple fiber is the diameter obtained by taking an enlarged photograph of the cross section of the nonwoven fabric substrate at a magnification of 3000 times with a microscope, measuring the cross-sectional area of the polyester staple fiber, and calculating the cross-sectional shape of the fiber as a perfect circle. , in the present invention, the arithmetic mean value of 10 or more fibers was determined.
ポリエステル系短繊維の繊維長は、好ましくは１～２０ｍｍであり、より好ましくは１～１０ｍｍであり、さらに好ましくは２～８ｍｍである。ポリエステル系短繊維の繊維長が１ｍｍ未満である場合、基材として必要な強度が発現しなくなることがある。ポリエステル系短繊維の繊維長が２０ｍｍ超の場合、均一性を損なう場合がある。 The fiber length of the polyester short fibers is preferably 1 to 20 mm, more preferably 1 to 10 mm, still more preferably 2 to 8 mm. If the fiber length of the polyester short fibers is less than 1 mm, the strength required as a base material may not be exhibited. If the fiber length of the polyester short fibers exceeds 20 mm, uniformity may be impaired.
上記繊維をシート状に形成せしめる方法としては、スパンボンド法、メルトブロー法、静電紡糸法、湿式法等の各種製造方法によることができる。繊維間を接合する方法としては、ケミカルボンド法、熱融着法等の各種方法によることができる。これらの中で、湿式法によってシート状に形成し、熱融着法によって接合することが、耐久性や強度に優れ表面が平滑な不織布基材が得られることから好ましい。 Various manufacturing methods such as a spunbonding method, a melt blowing method, an electrostatic spinning method and a wet method can be used as methods for forming the above fiber into a sheet. Various methods such as a chemical bond method and a heat fusion method can be used as a method for bonding between fibers. Among these, it is preferable to form a sheet by a wet method and to bond by a heat-sealing method because a nonwoven fabric base material having excellent durability and strength and a smooth surface can be obtained.
湿式法における熱融着法としては、抄紙で得られたシートを、多筒式ドライヤー、ヤンキードライヤー、エアースルードライヤー等の抄紙後に使用される乾燥機で乾燥する際に熱融着する方法を用いることができる。また、金属製熱ロール／金属製熱ロール、金属製熱ロール／弾性ロール、金属製熱ロール／コットンロールなどのロール組み合わせを有する熱カレンダー装置による熱カレンダー処理によって熱融着する方法が好ましい。熱カレンダー処理により、バインダー成分が熱溶融し、熱融着が生じる。 As the heat-sealing method in the wet method, a method of heat-sealing the sheet obtained by papermaking when drying it with a dryer used after papermaking such as a multi-tube dryer, a Yankee dryer, an air-through dryer, etc. is used. be able to. Also, a method of heat-sealing by thermal calendering using a thermal calender having a combination of rolls such as metal hot roll/metal hot roll, metal hot roll/elastic roll, and metal hot roll/cotton roll is preferred. The heat calendering heat-melts the binder component, resulting in heat-sealing.
また、熱カレンダーの条件は以下に例示することができるが、これらに限定されるものではない。熱カレンダー処理における熱ロールの温度は、２００℃以上２１５℃以下が好ましい。熱ロールの温度が２００℃未満の場合、繊維同士が接着せずに強度が発現しないという問題が発生し、逆に、熱ロールの温度が２１５℃超である場合、熱ロールに不織布が貼り付いてしまい、シートにならないという問題が発生する。熱ロールの温度は、より好ましくは、２０５℃以上２１０℃以下である。強度を発現するために熱カレンダー処理における圧力は、好ましくは５０～２５０ｋＮ／ｍであり、さらに好ましくは８０～１５０ｋＮ／ｍである。５０ｋＮ／ｍ未満である場合、表面の平滑性を損なう可能性があり、また、速度を低下させないと厚みが薄くならない可能性がある。２５０ｋＮ／ｍ超の場合、シートが圧力に耐えられずに破断する可能性がある。熱カレンダーの速度は１～３００ｍ／ｍｉｎが好ましい。１ｍ／ｍｉｎ以上とすることで、作業効率が良好となる。３００ｍ／ｍｉｎ以下とすることで、不織布基材に熱を伝導させ、熱融着の実効を得やすくなる。熱カレンダーのニップ回数は不織布基材に熱を伝導することができれば特に限定するものではないが、金属製熱ロール／弾性ロールの組み合わせでは、不織布基材の表裏から熱を伝導させるために２回以上ニップしても良い。 In addition, the conditions for thermal calendering can be exemplified below, but are not limited to these. The temperature of the hot roll in the hot calendering is preferably 200° C. or higher and 215° C. or lower. If the temperature of the heat roll is less than 200°C, the fibers do not bond to each other and strength does not develop. There is a problem that it does not become a sheet. The temperature of the hot roll is more preferably 205° C. or higher and 210° C. or lower. The pressure in the heat calendering is preferably 50-250 kN/m, more preferably 80-150 kN/m, in order to develop strength. If it is less than 50 kN/m, the smoothness of the surface may be impaired, and the thickness may not be reduced unless the speed is lowered. If it exceeds 250 kN/m, the sheet may break without being able to withstand the pressure. The speed of hot calendering is preferably 1 to 300 m/min. By making it 1 m/min or more, work efficiency is improved. By setting it to 300 m/min or less, heat is conducted to the nonwoven fabric base material, making it easier to obtain the effect of heat fusion. The number of nips of the hot calender is not particularly limited as long as heat can be conducted to the nonwoven fabric base material, but in the combination of metal hot rolls/elastic rolls, the number of nips is 2 in order to conduct heat from the front and back of the nonwoven fabric base material. You can nip more.
本発明の電磁波シールド材用不織布基材の厚みは、電子機器で使用する目的から、７～３０μｍであることが好ましく、目付（坪量）は６～３０ｇ／ｍ２であることが好ましい。目付が６ｇ／ｍ２未満であると、均一性を得ることが難しくなり、電磁波シールド性の効果にバラつきが発生しやすくなる。 The thickness of the nonwoven fabric substrate for electromagnetic wave shielding material of the present invention is preferably 7 to 30 μm, and the basis weight (basis weight) is preferably 6 to 30 g/m 2 for the purpose of use in electronic devices. If the basis weight is less than 6 g/m 2 , it becomes difficult to obtain uniformity, and the electromagnetic wave shielding effect tends to vary.
以下に実施例を挙げて本発明を説明するが、本発明はこれら実施例により何ら限定されるものではない。なお、実施例において、％及び部は、断りのない限り、全て質量基準である。また、実施例４及び７は参考例である。
EXAMPLES The present invention will be described below with reference to Examples, but the present invention is not limited to these Examples. In the examples, % and parts are all based on mass unless otherwise specified. Moreover, Examples 4 and 7 are reference examples.
［実施例１］
繊度０．０６ｄｔｅｘ（繊維径２．４μｍ）、繊維長３ｍｍの延伸ポリエチレンテレフタレート（ＰＥＴ）系短繊維６０質量部と、繊度０．２ｄｔｅｘ（繊維径４．３μｍ）、繊維長３ｍｍの単一成分型バインダー用未延伸ＰＥＴ系短繊維４０質量部とをパルパーにより水中に分散し、濃度１質量％の均一な抄造用スラリーを調製した。この抄造用スラリーを、通気度２７５ｃｍ３／ｃｍ２／ｓｅｃ、組織［上網：平織、下網：畝織］の抄造ワイヤーを設置した傾斜型抄紙機にて、湿式法で抄き上げ、１３５℃のシリンダードライヤーによって、バインダー用未延伸ＰＥＴ系短繊維を熱融着させて不織布強度を発現させ、目付１０ｇ／ｍ２の不織布とした。さらに、この不織布を、誘電発熱ジャケットロール（金属製熱ロール）及び弾性ロールからなる１ニップ式熱カレンダー装置を使用して、熱ロール温度２００℃、線圧１００ｋＮ／ｍ、処理速度３０ｍ／分の条件で熱カレンダー処理し、厚み１５μｍの不織布基材を作製した。
[Example 1]
60 parts by mass of stretched polyethylene terephthalate (PET) short fibers with a fineness of 0.06 dtex (fiber diameter of 2.4 μm) and a fiber length of 3 mm, and a single component type of a fineness of 0.2 dtex (fiber diameter of 4.3 μm) and a fiber length of 3 mm 40 parts by mass of unstretched PET short fibers for binder were dispersed in water with a pulper to prepare a uniform slurry for papermaking with a concentration of 1% by mass. This papermaking slurry was wet-processed using an inclined paper machine equipped with papermaking wires having an air permeability of 275 cm 3 /cm 2 /sec and a structure [upper net: plain weave, lower net: ribbed weave]. The non-stretched PET short fibers for the binder were heat-sealed with the cylinder dryer of No. 1 to express the strength of the non-woven fabric, thereby obtaining a non-woven fabric having a basis weight of 10 g/m 2 . Furthermore, this nonwoven fabric is treated using a one-nip type thermal calender consisting of a dielectric heating jacket roll (metal hot roll) and an elastic roll, at a hot roll temperature of 200°C, a linear pressure of 100 kN/m, and a processing speed of 30 m/min. A nonwoven fabric base material having a thickness of 15 μm was produced by heat calendering under the above conditions.
［実施例２］
繊度０．１ｄｔｅｘ（繊維径３．０μｍ）、繊維長３ｍｍの延伸ポリエチレンテレフタレート（ＰＥＴ）系短繊維２０質量部と、繊度０．０６ｄｔｅｘ（繊維径２．４μｍ）、繊維長３ｍｍの延伸ＰＥＴ系短繊維４０質量部と、繊度０．２ｄｔｅｘ（繊維径４．３μｍ）、繊維長３ｍｍの単一成分型バインダー用未延伸ＰＥＴ系短繊維４０質量部とした以外は実施例１と同じようにして、厚み１５μｍの不織布基材を作製した。
[Example 2]
20 parts by mass of drawn polyethylene terephthalate (PET) short fibers with a fineness of 0.1 dtex (fiber diameter of 3.0 μm) and a fiber length of 3 mm, and drawn PET short fibers with a fineness of 0.06 dtex (fiber diameter of 2.4 μm) and a fiber length of 3 mm. In the same manner as in Example 1, except that 40 parts by mass of fibers and 40 parts by mass of unstretched PET short fibers for a single-component type binder having a fineness of 0.2 dtex (fiber diameter of 4.3 μm) and a fiber length of 3 mm were used. A nonwoven fabric substrate having a thickness of 15 μm was produced.
［実施例３］
繊度０．３ｄｔｅｘ（繊維径５．３μｍ）、繊維長３ｍｍの延伸ポリエチレンテレフタレート（ＰＥＴ）系短繊維２０質量部と、繊度０．０６ｄｔｅｘ（繊維径２．４μｍ）、繊維長３ｍｍの延伸ＰＥＴ系短繊維４０質量部と、繊度０．２ｄｔｅｘ（繊維径４．３μｍ）、繊維長３ｍｍの単一成分型バインダー用未延伸ＰＥＴ系短繊維４０質量部とした以外は実施例１と同じようにして、厚み１５μｍの不織布基材を作製した。
[Example 3]
20 parts by mass of drawn polyethylene terephthalate (PET) short fibers with a fineness of 0.3 dtex (fiber diameter of 5.3 μm) and a fiber length of 3 mm, and drawn PET short fibers with a fineness of 0.06 dtex (fiber diameter of 2.4 μm) and a fiber length of 3 mm. In the same manner as in Example 1, except that 40 parts by mass of fibers and 40 parts by mass of unstretched PET short fibers for a single-component type binder having a fineness of 0.2 dtex (fiber diameter of 4.3 μm) and a fiber length of 3 mm were used. A nonwoven fabric substrate having a thickness of 15 μm was produced.
［実施例４］
繊度０．０６ｄｔｅｘ（繊維径２．４μｍ）、繊維長３ｍｍの延伸ＰＥＴ系短繊維９０質量部と、繊度０．２ｄｔｅｘ（繊維径４．３μｍ）、繊維長３ｍｍの単一成分型バインダー用未延伸ＰＥＴ系短繊維１０質量部とした以外は実施例１と同じようにして、厚み１５μｍの不織布基材を作製した。
[Example 4]
90 parts by mass of drawn PET short fibers with a fineness of 0.06 dtex (fiber diameter of 2.4 μm) and a fiber length of 3 mm, and undrawn single-component binder with a fineness of 0.2 dtex (fiber diameter of 4.3 μm) and a fiber length of 3 mm. A nonwoven fabric substrate having a thickness of 15 μm was produced in the same manner as in Example 1, except that the PET short fibers were 10 parts by mass.
［実施例５］
繊度０．０６ｄｔｅｘ（繊維径２．４μｍ）、繊維長３ｍｍの延伸ＰＥＴ系短繊維８０質量部と、繊度０．２ｄｔｅｘ（繊維径４．３μｍ）、繊維長３ｍｍの単一成分型バインダー用未延伸ＰＥＴ系短繊維２０質量部とした以外は実施例１と同じようにして、厚み１５μｍの不織布基材を作製した。
[Example 5]
80 parts by mass of drawn PET short fibers with a fineness of 0.06 dtex (fiber diameter of 2.4 µm) and a fiber length of 3 mm, and undrawn single-component binders with a fineness of 0.2 dtex (fiber diameter of 4.3 µm) and a fiber length of 3 mm. A nonwoven fabric substrate having a thickness of 15 μm was produced in the same manner as in Example 1, except that 20 parts by mass of PET short fibers were used.
［実施例６］
繊度０．０６ｄｔｅｘ（繊維径２．４μｍ）、繊維長３ｍｍの延伸ＰＥＴ系短繊維２０質量部と、繊度０．２ｄｔｅｘ（繊維径４．３μｍ）、繊維長３ｍｍの単一成分型バインダー用未延伸ＰＥＴ系短繊維８０質量部とした以外は実施例１と同じようにして、厚み１５μｍの不織布基材を作製した。
[Example 6]
20 parts by mass of stretched PET short fibers with a fineness of 0.06 dtex (fiber diameter of 2.4 μm) and a fiber length of 3 mm, and unstretched single-component binders with a fineness of 0.2 dtex (fiber diameter of 4.3 μm) and a fiber length of 3 mm A nonwoven fabric substrate having a thickness of 15 μm was produced in the same manner as in Example 1, except that 80 parts by mass of PET short fibers were used.
［実施例７］
繊度０．０６ｄｔｅｘ（繊維径２．４μｍ）、繊維長３ｍｍの延伸ＰＥＴ系短繊維１０質量部と、繊度０．２ｄｔｅｘ（繊維径４．３μｍ）、繊維長３ｍｍの単一成分型バインダー用未延伸ＰＥＴ系短繊維９０質量部とした以外は実施例１と同じようにして、厚み１５μｍの不織布基材を作製した。
[Example 7]
10 parts by mass of drawn PET short fibers with a fineness of 0.06 dtex (fiber diameter of 2.4 µm) and a fiber length of 3 mm, and undrawn single-component binders with a fineness of 0.2 dtex (fiber diameter of 4.3 µm) and a fiber length of 3 mm. A non-woven fabric substrate having a thickness of 15 μm was produced in the same manner as in Example 1, except that 90 parts by mass of the PET short fibers were used.
［比較例１］
繊度０．６ｄｔｅｘ（繊維径７．４μｍ）、繊維長５ｍｍの延伸ＰＥＴ系短繊維３０質量部と、繊度０．３ｄｔｅｘ（繊維径５．３μｍ）、繊維長３ｍｍの延伸ＰＥＴ系短繊維３０質量部と、繊度１．２ｄｔｅｘ（繊維径１０．５μｍ）、繊維長５ｍｍの単一成分型バインダー用未延伸ＰＥＴ系短繊維４０質量部とした以外は実施例１と同じようにして、厚み１５μｍの不織布基材を作製した。
[Comparative Example 1]
30 parts by mass of drawn PET short fibers with a fineness of 0.6 dtex (fiber diameter of 7.4 µm) and a fiber length of 5 mm and 30 parts by mass of drawn PET short fibers with a fineness of 0.3 dtex (fiber diameter of 5.3 µm) and a fiber length of 3 mm A non-woven fabric having a thickness of 15 μm was prepared in the same manner as in Example 1 except that 40 parts by mass of unstretched PET short fibers for a single-component type binder having a fineness of 1.2 dtex (fiber diameter of 10.5 μm) and a fiber length of 5 mm were used. A substrate was produced.
［比較例２］
繊度０．０６ｄｔｅｘ（繊維径２．４μｍ）、繊維長３ｍｍの延伸ＰＥＴ系短繊維６０質量部と、繊度１．２ｄｔｅｘ（繊維径１０．５μｍ）、繊維長５ｍｍの単一成分型バインダー用未延伸ＰＥＴ系短繊維４０質量部とした以外は実施例１と同じようにして、厚み１５μｍの不織布基材を作製した。
[Comparative Example 2]
60 parts by mass of stretched PET short fibers with a fineness of 0.06 dtex (fiber diameter of 2.4 μm) and a fiber length of 3 mm, and unstretched single-component binders with a fineness of 1.2 dtex (fiber diameter of 10.5 μm) and a fiber length of 5 mm A non-woven fabric substrate having a thickness of 15 μm was produced in the same manner as in Example 1, except that 40 parts by mass of PET short fibers were used.
［比較例３］
繊度０．６ｄｔｅｘ（繊維径７．４μｍ）、繊維長５ｍｍの延伸ＰＥＴ系短繊維３０質量部と、繊度０．３ｄｔｅｘ（繊維径５．３μｍ）、繊維長３ｍｍの延伸ＰＥＴ系短繊維３０質量部と、繊度０．２ｄｔｅｘ（繊維径４．３μｍ）、繊維長３ｍｍの単一成分型バインダー用未延伸ＰＥＴ系短繊維４０質量部とした以外は実施例１と同じようにして、厚み１５μｍの不織布基材を作製した。
[Comparative Example 3]
30 parts by mass of drawn PET short fibers with a fineness of 0.6 dtex (fiber diameter of 7.4 µm) and a fiber length of 5 mm and 30 parts by mass of drawn PET short fibers with a fineness of 0.3 dtex (fiber diameter of 5.3 µm) and a fiber length of 3 mm A nonwoven fabric having a thickness of 15 μm was prepared in the same manner as in Example 1 except that 40 parts by mass of unstretched PET short fibers for a single-component type binder having a fineness of 0.2 dtex (fiber diameter of 4.3 μm) and a fiber length of 3 mm were used. A substrate was produced.
［比較例４］
繊度０．１ｄｔｅｘ（繊維径３．０μｍ）、繊維長３ｍｍの延伸ＰＥＴ系短繊維５０質量部と、繊度０．２ｄｔｅｘ（繊維径４．３μｍ）、繊維長３ｍｍの単一成分型バインダー用未延伸ＰＥＴ系短繊維５０質量部とした以外は実施例１と同じようにして、厚み１５μｍの不織布基材を作製した。
[Comparative Example 4]
50 parts by mass of drawn PET short fibers with a fineness of 0.1 dtex (fiber diameter of 3.0 μm) and a fiber length of 3 mm, and undrawn single-component binders with a fineness of 0.2 dtex (fiber diameter of 4.3 μm) and a fiber length of 3 mm A nonwoven fabric substrate having a thickness of 15 μm was produced in the same manner as in Example 1, except that 50 parts by mass of PET short fibers were used.
実施例及び比較例で作製した不織布基材に対して無電解鍍金法により、銅及びニッケルの鍍金を施し、電磁波シールド材を作製した。 The nonwoven fabric substrates produced in Examples and Comparative Examples were plated with copper and nickel by an electroless plating method to produce electromagnetic wave shielding materials.
＜評価＞
［耐繊維脱落性］
不織布基材を５分間、１０％水酸化ナトリウム水溶液に浸した後、純水で十分に洗浄した。その後、学振型摩擦堅牢度試験機を使い、５００ｇｆの錘を載せたビリケンモス布を使って５往復基材を擦り下記基準で評価した。
<Evaluation>
[Resistance to falling off fibers]
The nonwoven fabric substrate was soaked in a 10% sodium hydroxide aqueous solution for 5 minutes and then thoroughly washed with pure water. After that, using a Gakushin type rubbing fastness tester, a billiken moss cloth on which a weight of 500 gf was placed was rubbed against the substrate five times and evaluated according to the following criteria.
「○」ビリケンモス布に繊維がほとんど付着しない。
「△」ビリケンモス布に繊維が若干付着するが実用上問題がない。
"◯" Almost no fibers adhere to the Billiken moss cloth.
"Fair": A few fibers adhere to the Billiken moss cloth, but there is no practical problem.
［電磁波シールド性］
電磁波シールド材をＫＥＣ法によって評価した。
[Electromagnetic shielding]
The electromagnetic wave shielding material was evaluated by the KEC method.
「◎」特に優れた電磁波シールド性がある。
「○」優れた電磁波シールド性がある。
「△」やや優れた電磁波シールド性がある。
「×」電磁波シールド性が劣る。
"A" has particularly excellent electromagnetic wave shielding properties.
"○" has excellent electromagnetic wave shielding properties.
"Δ" has somewhat excellent electromagnetic wave shielding properties.
"X": Poor electromagnetic wave shielding properties.
実施例１～４の不織布基材は、繊維径が３．０μｍ未満の延伸ポリエステル系短繊維と繊維径が３．０μｍ以上５．０μｍ以下の未延伸ポリエステル系短繊維とを必須成分として含有することから、優れた電磁波シールド性がある。これに対し、繊維径が３．０μｍ未満の延伸ポリエステル系短繊維と繊維径が３．０μｍ以上５．０μｍ以下の未延伸ポリエステル系短繊維とを含有していない比較例１の不織布基材、繊維径が３．０μｍ以上５．０μｍ以下の未延伸ポリエステル系短繊維を含有していない比較例２の不織布基材、繊維径が３．０μｍ未満の延伸ポリエステル系短繊維を含有していない比較例３及び４の不織布基材では、電磁波シールド性が劣るものであった。 The nonwoven fabric substrates of Examples 1 to 4 contain stretched polyester staple fibers with a fiber diameter of less than 3.0 μm and unstretched polyester staple fibers with a fiber diameter of 3.0 μm or more and 5.0 μm or less as essential components. Therefore, it has excellent electromagnetic wave shielding properties. In contrast, the nonwoven fabric substrate of Comparative Example 1, which does not contain stretched polyester short fibers with a fiber diameter of less than 3.0 μm and unstretched polyester short fibers with a fiber diameter of 3.0 μm or more and 5.0 μm or less, Non-woven fabric substrate of Comparative Example 2 that does not contain unstretched polyester short fibers with a fiber diameter of 3.0 μm or more and 5.0 μm or less, comparison that does not contain stretched polyester short fibers with a fiber diameter of less than 3.0 μm The nonwoven fabric substrates of Examples 3 and 4 were inferior in electromagnetic wave shielding properties.
また、未延伸ポリエステル系短繊維の含有率が不織布基材を構成する繊維全体の２０質量％未満である実施例４は、含有率が２０質量％以上の実施例１～３、５、６と比較してやや耐繊維脱落性すなわち強度が低下した。また、未延伸ポリエステル系短繊維の含有率が不織布基材を構成する繊維全体の８０質量％を超える実施例７は、含有率が８０質量％以下の実施例１～３、５、６と比較してやや電磁波シールド性が低下した。繊維の融着点が多く、フィルム状になり、不織布基材としての均一性が損なわれたためと考える。 In addition, Example 4, in which the content of unstretched polyester short fibers is less than 20% by mass of the total fibers constituting the nonwoven fabric substrate, is similar to Examples 1 to 3, 5, and 6, in which the content is 20% by mass or more. In comparison, the resistance to fiber dropout, that is, the strength, was slightly lowered. In addition, Example 7, in which the content of unstretched polyester short fibers exceeds 80% by mass of the total fibers constituting the nonwoven fabric substrate, is compared with Examples 1 to 3, 5, and 6 in which the content is 80% by mass or less. As a result, the electromagnetic wave shielding performance decreased slightly. It is thought that this is because the fibers had many fused points and formed a film, impairing the uniformity of the nonwoven fabric base material.
本発明の不織布基材の活用例としては、電磁波シールド材が好適である。 An electromagnetic wave shielding material is suitable as an example of utilization of the nonwoven fabric base material of the present invention.
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