JP2019049080A - Nonwoven fabric substrate for electromagnetic wave-shielding material - Google Patents
Nonwoven fabric substrate for electromagnetic wave-shielding material Download PDFInfo
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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。 The present invention relates to a non-woven fabric substrate for an electromagnetic wave shielding material which can exhibit excellent electromagnetic wave 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）。 The electronic device generates an electromagnetic wave. Then, in order to prevent the electromagnetic wave from leaking to the outside of the electronic device and also to prevent the electronic device from malfunctioning due to the electromagnetic wave, an electromagnetic wave shielding material is used. Examples of the electromagnetic wave shielding material include a sheet metal, a paint containing a metal, a metal mesh, a foam metal and the like. With the recent miniaturization of electronic devices, a thin electromagnetic wave shielding material is required, and an electromagnetic wave shielding material formed by applying metal plating processing to a non-woven fabric formed of polyester short fibers is 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 example of Patent Document 1, short fibers with a fiber diameter of 3 μm and 7.4 μm are used as the drawn polyester short fibers, but as thin electromagnetic wave shielding materials are required, there is a problem that electromagnetic wave shielding properties can not be sufficiently 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 non-woven fabric substrate for an electromagnetic wave shielding material which can exhibit excellent electromagnetic wave 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、湿式不織布である電磁波シールド材用不織布基材において、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す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。 MEANS TO SOLVE THE PROBLEM As a result of the present inventors earnestly researching in order to solve the said subject, in the nonwoven fabric base material for electromagnetic wave shield materials which is a wet nonwoven fabric, a wet nonwoven fabric has a fiber diameter of less than 3.0 micrometers drawn polyester-based short fibers and fibers The inventors have found a non-woven fabric base material for an electromagnetic wave shielding material comprising an undrawn polyester short fiber having a diameter of 3.0 μm or more and 5.0 μm or less as an essential component.
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 an electromagnetic wave shielding material of the present invention provides a nonwoven fabric base material for an electromagnetic wave shielding material which can exhibit 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。 Hereinafter, the nonwoven fabric base material for electromagnetic wave shielding materials of the present invention will be described in detail. In the present invention, the nonwoven fabric base for an electromagnetic wave shielding material comprises, as essential components, a drawn polyester-based short fiber having a fiber diameter of less than 3.0 μm and an undrawn polyester-based short fiber having a fiber diameter of 3.0 to 5.0 μm. 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。 In general, electroless plating is used for plating the non-woven fabric base material for electromagnetic shielding material, but in electroless plating, per unit volume per unit volume if the specific surface area (surface area per unit volume) of the fibers forming the non-woven fabric is small. The amount of metal deposition on the surface decreases, and excellent electromagnetic wave shielding properties can not be expressed. When the drawn polyester-based short fiber having a fiber diameter of less than 3.0 μm and the undrawn polyester-based short fiber having 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. Electromagnetic wave shielding can be expressed. That is, the electromagnetic wave shielding properties are excellent when the nonwoven fabric base material for the electromagnetic wave shielding material comprises only drawn polyester short fibers with a fiber diameter of 3.0 μm or more and undrawn polyester short fibers with a fiber diameter of more than 5.0 μm. Can not be expressed. In addition, a thin electromagnetic shielding material is required, and if the fiber diameter is small, the strength as the electromagnetic shielding material may not be obtained. A nonwoven fabric base material for an electromagnetic wave shielding material having a thin strength by containing a stretched polyester short fiber having a fiber diameter of less than 3.0 μm and an unstretched polyester short fiber having a fiber diameter of 3.0 μm to 5.0 μm. It becomes easy 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 drawn polyester short fiber is a main fiber which is hardly melted or softened even by heat calendering, and forms a skeleton of the non-woven fabric substrate.
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 undrawn polyester short fibers are melted or softened by heat calendering, and function as binder fibers to increase the strength of the non-woven fabric substrate. The melting point of the unstretched polyester is preferably 220 ° C to 250 ° C. When the melting point of the unstretched polyester is less than 220 ° C., the non-woven fabric substrate may stick to the heat roll at the time of heat calendering treatment and the sheet may not be a sheet. If it exceeds 250 ° C., the fibers may not adhere and the strength of the sheet may not be developed.
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 the undrawn polyester short fiber is a peak temperature when the temperature is increased from 25 ° C. to 300 ° C. at a heating rate of 10 ° C./min in a nitrogen atmosphere by 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 nonwoven fabric base for an electromagnetic wave shielding material comprises, as essential components, a drawn polyester-based short fiber having a fiber diameter of less than 3.0 μm and an undrawn polyester-based short fiber having a fiber diameter of 3.0 to 5.0 μm. contains. The fiber diameter of the drawn polyester short fiber having a fiber diameter of less than 3.0 μm is preferably 0.1 μm or more. When 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 drawn polyester short fiber and the undrawn polyester short fiber is preferably 20:80 to 80:20. When the content rate of the undrawn polyester short fibers is less than 20% by mass of the entire fibers constituting the nonwoven fabric substrate, the strength necessary for the substrate may not be expressed. On the other hand, if the content of undrawn polyester short fibers exceeds 80% by mass, the 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 drawn polyester short fibers having a fiber diameter of less than 3.0 μm and undrawn polyester short fibers having a fiber diameter of 3.0 μm to 5.0 μm may be used. That is, a drawn polyester short fiber having a fiber diameter of 3.0 μm or more and an undrawn polyester short fiber having a fiber diameter of less than 3.0 μm or more than 5.0 μm may be used. Each of these may be used alone, or fibers of two or more fiber diameters may be used in combination.
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。 With respect to drawn polyester-based short fibers having a fiber diameter of less than 3.0 μm, the mass content thereof is preferably 1 to 100% by mass, and 3 to 100% by mass in the total drawn polyester-based short fibers contained. Is more preferred. If the content of the drawn polyester short fibers having a fiber diameter of less than 3.0 μm is less than 1% by mass, the specific surface area may be reduced depending on the diameter of the fiber to be used in combination, which may make it difficult to express excellent electromagnetic wave 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, with respect to unstretched polyester short fibers having a fiber diameter of 3.0 μm or more and 5.0 μm or less, the mass content thereof is preferably 1 to 100 mass% in the total unstretched polyester short fibers contained, 2 to 2 100 mass% is more preferable. When the content of unstretched polyester short fibers having 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 decreases depending on the fiber diameter used in combination, and excellent electromagnetic wave shielding properties are expressed It may become difficult or it may become difficult to develop the strength of the excellent nonwoven fabric.
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 polyester-based staple fiber is a diameter obtained by taking a magnified photograph of the cross section of the nonwoven fabric substrate at 3000 times with a microscope, measuring the cross-sectional area of polyester-based staple fiber, and calculating the fiber cross-sectional shape as a perfect circle. In the present invention, the arithmetic mean value of ten 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-based staple fiber is preferably 1 to 20 mm, more preferably 1 to 10 mm, and still more preferably 2 to 8 mm. When the fiber length of the polyester short fiber is less than 1 mm, the strength necessary for the substrate may not be developed. If the fiber length of the polyester staple fiber is more than 20 mm, the 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。 As a method of forming the said fiber in a sheet form, it can be based on various manufacturing methods, such as a spun bond method, a melt-blowing method, an electrostatic spinning method, a wet method. As a method of bonding between fibers, various methods such as a chemical bond method and a heat fusion method can be used. Among these, it is preferable to form in a sheet shape by a wet method and to bond by a heat fusion method because a nonwoven fabric base 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 a heat fusion method in the wet method, a method of heat fusion is used when drying a sheet obtained by paper making with a dryer used after paper making such as a multi-cylinder dryer, Yankee dryer, air through dryer, etc. be able to. In addition, it is preferable to carry out heat fusion by a heat calendering process using a heat calender device having a roll combination such as a metal heat roll / metal heat roll, a metal heat roll / elastic roll, and a metal heat roll / cotton roll. The heat calendering treatment causes the binder component to be heat melted and causes heat fusion.
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。 Also, the conditions of the thermal calendar can be exemplified below, but are not limited thereto. The temperature of the heat roll in heat calendering is preferably 200 ° C. or more and 215 ° C. or less. When the temperature of the heat roll is less than 200 ° C., there is a problem that the fibers do not adhere to each other and strength does not develop, and conversely, when the temperature of the heat roll is more than 215 ° C., the non-woven fabric adheres to the heat roll And the problem of not forming a sheet occurs. The temperature of the heat roll is more preferably 205 ° C. or more and 210 ° C. or less. The pressure in the heat calendering treatment to develop strength is preferably 50 to 250 kN / m, more preferably 80 to 150 kN / m. 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 reduced. If it exceeds 250 kN / m, the sheet may break without being able to withstand pressure. The speed of the heat calender is preferably 1 to 300 m / min. Work efficiency becomes good by setting it as 1 m / min or more. By setting the density to 300 m / min or less, heat is conducted to the non-woven fabric substrate, and it becomes easy to obtain the effect of heat fusion. The number of nips of the heat calender is not particularly limited as long as heat can be conducted to the non-woven fabric substrate, but in the case of a combination of metal heat roll / elastic roll, twice to conduct heat from the front and back of the non-woven fabric substrate. The above may be nipped.
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。 It is preferable that it is 7-30 micrometers for the purpose of using with an electronic device for the thickness of the nonwoven fabric base material for electromagnetic wave shielding materials of this invention, and it is preferable that a fabric weight (basic weight) is 6-30 g / m < 2 >. If the areal weight is less than 6 g / m 2 , it is difficult to obtain uniformity, and variations in the electromagnetic wave shielding effect are likely to occur.
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。 EXAMPLES The present invention will be described by way of examples, which should not be construed as limiting the present invention. In the examples,% and parts are all based on mass unless otherwise noted.
［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 drawn polyethylene terephthalate (PET) short fibers with a fineness of 0.06 dtex (fiber diameter 2.4 μm) and a fiber length of 3 mm, and a single component type with a fineness of 0.2 dtex (fiber diameter 4.3 μm) and a fiber length of 3 mm 40 parts by mass of undrawn PET-based short fiber for binder was dispersed in water with a pulper to prepare a uniform sheet-forming slurry with a concentration of 1% by mass. This slurry for papermaking is formed by a wet method on an inclined paper machine equipped with a papermaking wire having an air permeability of 275 cm 3 / cm 2 / sec and a texture [upper mesh: plain weave, lower mesh: twill weave], 135 ° C. The unstretched PET-based short fiber for binder was heat-sealed by a cylinder drier in order to develop the strength of the non-woven fabric, whereby a non-woven fabric with a fabric weight of 10 g / m 2 was formed. Furthermore, this non-woven fabric was heated at a temperature of 200 ° C., a linear pressure of 100 kN / m, and a processing speed of 30 m / min using a one-nip heat calendar device comprising a dielectric heating jacket roll (metal heat roll) and an elastic roll. It heat-calendered on conditions, and produced the 15-micrometer-thick nonwoven fabric base material.
［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 3.0 μm) and a fiber length of 3 mm, and a drawn PET short with a fineness of 0.06 dtex (fiber diameter 2.4 μm) In the same manner as in Example 1 except that 40 parts by mass of fibers, 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 non-woven 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 5.3 μm) and a fiber length of 3 mm, and a drawn PET short with a fineness of 0.06 dtex (fiber diameter 2.4 μm) In the same manner as in Example 1 except that 40 parts by mass of fibers, 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 non-woven 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 weight of drawn PET-based short fibers with a fineness of 0.06 dtex (fiber diameter 2.4 μm) and a fiber length of 3 mm, and undrawn for single component type binders with a fineness of 0.2 dtex (fiber diameter 4.3 μm) A nonwoven fabric substrate with a thickness of 15 μm was produced in the same manner as in Example 1 except that 10 parts by mass of PET short fibers were used.
［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]
Unstretched for single component type binder with a denier of 0.06 dtex (fiber diameter 2.4 μm) and a stretched PET-based short fiber with a fiber length of 3 mm and a denier of 0.2 dtex (fiber diameter of 4.3 μm) and a fiber length of 3 mm A nonwoven fabric substrate with a thickness of 15 μm was produced in the same manner as in Example 1 except that 20 parts by mass of PET-based 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 drawn PET-based short fibers with a fineness of 0.06 dtex (fiber diameter 2.4 μm) and a fiber length of 3 mm, and undrawn for single component type binders with a fineness of 0.2 dtex (fiber diameter 4.3 μm) A nonwoven fabric substrate with a thickness of 15 μm was produced in the same manner as in Example 1 except that 80 parts by mass of PET-based 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-based short fibers with a fineness of 0.06 dtex (fiber diameter 2.4 μm) and a fiber length of 3 mm, and undrawn for single component type binders with a fineness of 0.2 dtex (fiber diameter 4.3 μm) A nonwoven fabric substrate with a thickness of 15 μm was produced in the same manner as in Example 1 except that 90 parts by mass of PET-based 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-based short fibers with a denier of 0.6 dtex (fiber diameter 7.4 μm) and a fiber length of 5 mm, and 30 parts by mass of drawn PET-based short fibers with a denier of 0.3 dtex (fiber diameter of 5.3 μm) And a nonwoven fabric having a thickness of 15 μm in the same manner as in Example 1 except that 40 parts by mass of unstretched PET-based short fibers for a single component type binder having a fineness of 1.2 dtex (fiber diameter 10.5 μm) and a fiber length of 5 mm A substrate was made.
［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 drawn PET-based short fibers with a fineness of 0.06 dtex (fiber diameter 2.4 μm) and a fiber length of 3 mm, and undrawn for single component type binders with a fineness of 1.2 dtex (fiber diameter 10.5 μm) and a fiber length of 5 mm A nonwoven fabric substrate with a thickness of 15 μm was produced in the same manner as in Example 1 except that 40 parts by mass of PET-based 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-based short fibers with a denier of 0.6 dtex (fiber diameter 7.4 μm) and a fiber length of 5 mm, and 30 parts by mass of drawn PET-based short fibers with a denier of 0.3 dtex (fiber diameter of 5.3 μm) And a nonwoven fabric having a thickness of 15 μm in the same manner as in Example 1 except that 40 parts by mass of unstretched PET-based short fiber for a single component type binder having a fineness of 0.2 dtex (fiber diameter 4.3 μm) and a fiber length of 3 mm A substrate was made.
［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
Unstretched for single component type binders with a denier of 0.1 dtex (fiber diameter 3.0 μm) and a stretched PET-based short fiber with a fiber length of 3 mm and a denier of 0.2 dtex (fiber diameter of 4.3 μm) and a fiber length of 3 mm A nonwoven fabric substrate with a thickness of 15 μm was produced in the same manner as in Example 1 except that 50 parts by mass of PET-based 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。 Copper and nickel were plated on the non-woven fabric substrates produced in Examples and Comparative Examples by the electroless plating method, to produce an electromagnetic shielding material.
＜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>
[Fiber resistant to falling off]
The non-woven fabric substrate was immersed in a 10% aqueous solution of sodium hydroxide for 5 minutes and then thoroughly washed with pure water. After that, using a Gakushin-type friction fastness tester, a 5-reciprocation substrate was rubbed using a Birken moth cloth loaded with a 500 gf weight, 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 fiber adheres to the "○" Birken moss cloth.
Some fibers adhere to the "△" bilik moth cloth, but there is no problem in practical use.
［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 wave shielding property]
The electromagnetic 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。
"◎" There is an excellent electromagnetic wave shielding property.
"○" has excellent electromagnetic wave shielding properties.
"△" There is a somewhat superior electromagnetic wave shielding property.
"X" electromagnetic wave shielding property is inferior.
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, as essential components, drawn polyester short fibers having a fiber diameter of less than 3.0 μm and undrawn polyester short fibers having a fiber diameter of 3.0 μm to 5.0 μm. Therefore, it has excellent electromagnetic shielding properties. On the other hand, the nonwoven fabric base material of Comparative Example 1 which does not contain a stretched polyester-based short fiber having a fiber diameter of less than 3.0 μm and an unstretched polyester-based short fiber having a fiber diameter of 3.0 to 5.0 μm, Non-woven fabric base material of Comparative Example 2 not containing undrawn polyester short fiber having a fiber diameter of 3.0 μm or more and 5.0 μm or less, comparison not containing drawn polyester short fiber having 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 entire fibers constituting the nonwoven fabric substrate, Examples 1 to 3, 5 and 6 in which the content is 20% by mass or more In comparison, the defibering resistance, that is, the strength was slightly reduced. In addition, Example 7 in which the content of undrawn 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 Then the electromagnetic wave shielding performance was slightly reduced. It is considered that the number of fusion points of the fibers is large, the film is formed, and the uniformity as the non-woven fabric substrate is lost.
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 shielding material is suitable as an application example of the non-woven fabric substrate of the present invention.
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| CN112703281A (en) * | 2018-09-19 | 2021-04-23 | 三菱制纸株式会社 | Nonwoven fabric for electromagnetic wave shielding material and electromagnetic wave shielding material |
| JP2022043131A (en) * | 2018-09-19 | 2022-03-15 | 三菱製紙株式会社 | Manufacturing method of electromagnetic wave shield material |
| CN112030547A (en) * | 2020-09-17 | 2020-12-04 | 兴中村(东莞)新材料科技有限公司 | Manufacturing method of conductive shielding non-woven fabric |
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