JP5073525B2 - Electromagnetic wave suppression paper - Google Patents
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- JP5073525B2 JP5073525B2 JP2008036587A JP2008036587A JP5073525B2 JP 5073525 B2 JP5073525 B2 JP 5073525B2 JP 2008036587 A JP2008036587 A JP 2008036587A JP 2008036587 A JP2008036587 A JP 2008036587A JP 5073525 B2 JP5073525 B2 JP 5073525B2
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Landscapes
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Description
本発明は、木材パルプと炭素繊維とからなる原紙に難燃剤とサイズ剤を含有させた電磁波抑制紙に関するものである。 The present invention relates to an electromagnetic wave suppression paper in which a base paper composed of wood pulp and carbon fiber contains a flame retardant and a sizing agent.
近年、様々な分野でデジタル化が進み、身の回りにおいて、各種の情報通信、医療機器、精密機器などの制御分野において、また、電化製品、自動車などの日常生活品の分野においても高速高集積化された電子機器が広く使用されている。特にコンピュータや携帯電話、薄型テレビなど電子機器の性能が飛躍的に向上するにつれて、各種電子機器から漏洩する電磁波は、他の電子機器の誤作動だけでなく、人々の健康にも悪影響を与えていると言われており、電磁波障害対策が必要不可欠となってきている。 In recent years, digitalization has progressed in various fields, and high-speed and high-integration has been achieved in the control field of various information communication, medical equipment, precision equipment, etc., and in daily life goods such as electrical appliances and automobiles. Electronic devices are widely used. In particular, as the performance of electronic devices such as computers, mobile phones, and flat-screen TVs has improved dramatically, electromagnetic waves leaking from various electronic devices not only malfunctioning other electronic devices, but also have a negative impact on people's health. Therefore, countermeasures against electromagnetic interference have become indispensable.
この対策として、従来、これらの電波や電磁波の反射を防ぎ、電磁波のエネルギーを熱のエネルギーにかえる多種多様な電磁波吸収材が用いられてきた。なお、金属板は、厚みの如何に拘らず、一般にその表面で電磁波を反射してしまい、吸収能力がない。その中で、シート状の電磁波吸収体がデジタル機器などに多く使われている。 Conventionally, a variety of electromagnetic wave absorbing materials that prevent reflection of these radio waves and electromagnetic waves and change the electromagnetic wave energy to heat energy have been used as countermeasures. Note that, regardless of the thickness, the metal plate generally reflects electromagnetic waves on its surface and has no absorption capability. Among them, sheet-shaped electromagnetic wave absorbers are often used in digital devices and the like.
電磁波吸収体の基材（母材）には、プラスチック、金属、ゴム、フィルム、繊維又はそれらの複合体などが使用されているが、重い・厚い・加工が困難などの問題点がある。そこで、本発明者らは、紙をベースとし、炭素繊維を抄き込んだ軽い・薄い・加工性の良い電磁波抑制紙を検討している。 Plastics, metals, rubbers, films, fibers, or composites thereof are used as the base material (base material) of the electromagnetic wave absorber, but there are problems such as being heavy, thick, and difficult to process. Therefore, the present inventors are studying a light, thin, and easily workable electromagnetic wave suppression paper based on paper and made of carbon fiber.
炭素繊維には、原料からポリアクリルニトリル系（以下、「ＰＡＮ系」と呼ぶ。）、ピッチ系、レーヨン系の３種類に分類される。また、その最終熱処理温度によって炭素質繊維と黒鉛質繊維とに分類される。炭素繊維には、次のような特徴がある。（１）軽量であり、機械的強度・弾性率が優れている。引張り・圧縮両方向ともに良好である。（２）クリープ疲労は、ほとんどない。（３）耐衝撃性が低い。（４）電気伝導度、熱伝導度、比熱は、金属と非金属との中間に位置するが、金属に近い。（５）熱膨張率が小さい。（６）低密度であり、Ｘ線の透過性が良好である。 Carbon fibers are classified into three types, from raw materials to polyacrylonitrile (hereinafter referred to as “PAN”), pitch, and rayon. Moreover, it classify | categorizes into a carbonaceous fiber and a graphite fiber by the final heat processing temperature. Carbon fiber has the following characteristics. (1) Light weight and excellent mechanical strength and elastic modulus. Good in both tensile and compression directions. (2) There is almost no creep fatigue. (3) Low impact resistance. (4) Electrical conductivity, thermal conductivity, and specific heat are located between metal and nonmetal, but close to metal. (5) The coefficient of thermal expansion is small. (6) Low density and good X-ray transmission.
炭素繊維の直径は、７〜２０μｍであるが、その機械的性質は、グレードによって大きく異なっている。一般的特性として汎用ピッチ系炭素繊維は、糸径１４．５μｍ、密度１．６５ｇ／ｃｍ３、引張強さ７２０ＭＰａ、引張弾性率３２ＧＰａであり、ＰＡＮ系炭素質繊維では糸径７μｍ、密度１．７４ｇ／ｃｍ３、引張強さ３３００ＭＰａ、引張弾性率２３０ＧＰａにも達する。ＰＡＮ系炭素繊維は、アクリルニトリルモノマーとビニルモノマーとの共重合体を紡糸したＰＡＮ繊維を、２００〜３００℃で空気酸化によって耐炎化処理し、続いて不活性ガス中で８００〜１３００℃で炭化して製造する。これに表面サイジングを施したものが市販の炭素繊維である。 The diameter of the carbon fiber is 7 to 20 μm, but its mechanical properties vary greatly depending on the grade. As general characteristics, the general-purpose pitch-based carbon fiber has a yarn diameter of 14.5 μm, a density of 1.65 g / cm 3 , a tensile strength of 720 MPa, and a tensile elastic modulus of 32 GPa, and a PAN-based carbon fiber has a yarn diameter of 7 μm and a density of 1. It reaches 74 g / cm 3 , a tensile strength of 3300 MPa, and a tensile modulus of 230 GPa. The PAN-based carbon fiber is a PAN fiber obtained by spinning a copolymer of an acrylonitrile monomer and a vinyl monomer, subjected to flame resistance treatment by air oxidation at 200 to 300 ° C., and then carbonized at 800 to 1300 ° C. in an inert gas. To manufacture. Commercially available carbon fiber is obtained by subjecting it to surface sizing.
抄紙用原糸とする場合は、表面サイジングが一般的であるＰＡＮ系炭素繊維を必要によって脱サイジング処理する。また、もともと炭素繊維は、表面が不活性であり、他の樹脂などとの接着性があまり良好でないため、酸化法などによる表面処理を行う場合もある。 In the case of making a papermaking yarn, a PAN-based carbon fiber, which is commonly used for surface sizing, is desized if necessary. In addition, the surface of carbon fiber is originally inactive and its adhesion to other resins is not so good, so that surface treatment by an oxidation method or the like may be performed.
ピッチ系炭素繊維は、石油系又は石炭系のピッチを紡糸に適するように粘度や分子量を調整して溶融紡糸を行う。よられたピッチ系炭素繊維を空気、オゾン、ハロゲンガスなどを使用して不融化処理を行う。その後炭化処理を行って製造される。原料ピッチの段階で調整することによって等方性と異方性のものが得られる。異方性炭素繊維は、液晶ピッチを繊維軸方向に配列させたものであり、無延伸で高配向の高性能グレードの炭素繊維を得ることができる。 The pitch-based carbon fiber is melt-spun by adjusting the viscosity and molecular weight so that a petroleum-based or coal-based pitch is suitable for spinning. The pitch-based carbon fiber is infusibilized using air, ozone, halogen gas, or the like. Thereafter, carbonization is performed. An isotropic and anisotropic material can be obtained by adjusting at the stage of the raw material pitch. Anisotropic carbon fibers are obtained by arranging liquid crystal pitches in the fiber axis direction, and high-performance grade carbon fibers that are non-stretched and highly oriented can be obtained.
炭素繊維を用いた電磁波吸収材に関しては、次に示す技術が提案されている（例えば特許文献１〜５を参照。）。 Regarding electromagnetic wave absorbers using carbon fibers, the following techniques have been proposed (see, for example, Patent Documents 1 to 5).
例えば、特許文献１には、樹脂中に、前記樹脂１００重量部に対してカーボンブラックを５〜１０重量部及び気相成長炭素繊維を１〜１０重量部の割合で配合した樹脂組成物を成形してなることを特徴とする電磁波吸収材が記載されている。 For example, in Patent Document 1, a resin composition in which 5 to 10 parts by weight of carbon black and 1 to 10 parts by weight of vapor-grown carbon fiber are mixed with 100 parts by weight of the resin in a resin is molded. An electromagnetic wave absorbing material characterized by being formed is described.
特許文献２には、熱可塑性樹脂と炭素繊維を含有する樹脂組成物１００重量部に対し、炭素繊維の割合が１０〜５０重量部であって、該炭素繊維のうち、繊維長が５００μｍ以上のものの割合が１０〜５０重量部であることを特徴とする電磁波吸収材が記載されている。 In Patent Document 2, the ratio of the carbon fiber is 10 to 50 parts by weight with respect to 100 parts by weight of the resin composition containing the thermoplastic resin and the carbon fiber, and the fiber length of the carbon fiber is 500 μm or more. An electromagnetic wave absorbing material characterized in that the ratio of the material is 10 to 50 parts by weight is described.
特許文献３には、高分子素材１００重量部に対し６０〜２００重量部となる割合で前記高分子素材に炭素繊維を添加してシート状に形成してある電磁波シールド材が記載されている。 Patent Document 3 describes an electromagnetic wave shielding material formed by adding carbon fiber to the polymer material in a ratio of 60 to 200 parts by weight with respect to 100 parts by weight of the polymer material.
特許文献４には、形状がコイル状をしている微小炭素繊維からなる電磁波吸収材料を全原料の絶乾重量に対して固形分で５〜８５重量部の範囲で含有し、コイル状微小炭素繊維以外の残部として、セルロース繊維を主体とする有機分を固形分で１５〜４０重量部及び含水無機化合物粉体を固形分で６０〜８５重量部の割合で含有し、かつ、前記コイル状微小炭素繊維の単位体積当りの存在量を０．０２〜０．３５ｇ／ｃｍ３とする。このシートを製造するにあたっては、コイル状微小炭素繊維を、界面活性剤を用いて水に分散させた水分散液とセルロース繊維を主体とする有機分及び含水無機化合物粉体を含むスラリーとを混合して紙料とし、通常の抄紙方法によって抄造することを特徴とする難燃性電磁波吸収シートが記載されている。 Patent Document 4 contains an electromagnetic wave absorbing material composed of fine carbon fibers having a coil shape in a range of 5 to 85 parts by weight in solid content with respect to the absolute dry weight of all raw materials, As the balance other than the fibers, the organic content mainly composed of cellulose fibers is contained in a solid content of 15 to 40 parts by weight and the hydrated inorganic compound powder is contained in a solid content of 60 to 85 parts by weight. The amount of carbon fiber present per unit volume is set to 0.02 to 0.35 g / cm 3 . In producing this sheet, an aqueous dispersion in which coiled microcarbon fibers are dispersed in water using a surfactant and a slurry containing organic components mainly containing cellulose fibers and water-containing inorganic compound powders are mixed. Thus, a flame retardant electromagnetic wave absorbing sheet is described which is made into a paper material and made by a normal paper making method.
特許文献５には、セルロース繊維を主体とする有機分を固形分で１５〜９５重量部、形状がコイル状をしている微小炭素繊維を固形分で５〜８５重量部の範囲で含有し、かつ、コイル状微小炭素繊維の単位体積当りの存在量を０．０２〜０．３５ｇ／ｃｍ３とした電磁波吸収シートが記載されている。 Patent Document 5 contains 15 to 95 parts by weight of an organic component mainly composed of cellulose fibers in a solid content, and a minute carbon fiber having a coil shape in a range of 5 to 85 parts by weight in a solid content. In addition, an electromagnetic wave absorbing sheet in which the abundance per unit volume of the coiled fine carbon fiber is 0.02 to 0.35 g / cm 3 is described.
本発明は、前述の背景に基づきなされたものであり、その目的とするところは、電磁波吸収性能を低下させることなく、導電性及び耐熱性を向上させた電磁波抑制紙を提供することにある。より具体的には、本発明の課題は、加工の容易な紙を主体とした電磁波抑制紙を対象とし、鉄板と接触したときに錆の発生がなく、燃焼時の有毒ガスの発生がなく、ＵＬ規格においてＵＬ９４Ｖ−０及び／又はＵＬ９４ＶＴＭ−０の難燃性を有し、８５℃以上の環境条件下において耐熱性に優れ、しかもその電磁波抑制効果を低下させることがなく、さらにサイズ性を有した電磁波抑制紙を提供することにある。 The present invention has been made based on the above-mentioned background, and an object thereof is to provide an electromagnetic wave suppression paper having improved conductivity and heat resistance without deteriorating electromagnetic wave absorption performance. More specifically, the subject of the present invention is directed to an electromagnetic wave suppression paper mainly composed of easy-to-process paper, there is no generation of rust when in contact with an iron plate, there is no generation of toxic gas during combustion, It has UL94V-0 and / or UL94VTM-0 flame retardancy in the UL standard, has excellent heat resistance under environmental conditions of 85 ° C or higher, and does not deteriorate its electromagnetic wave suppression effect, and has size characteristics. It is in providing the electromagnetic wave suppression paper which carried out.
本発明は、木材パルプと炭素繊維を含む原紙にグアニジン系難燃剤とサイズ剤を含浸するという検討を重ね、前記課題を解決しようとするものである。すなわち、本発明に係る電磁波抑制紙は、主体繊維として木材パルプとＰＡＮ系炭素繊維とを含有し、サイズ剤を内添又は外添せずに単層又は多層で抄造されたＪＩＳ Ｐ ８１２２：２００４「紙及び板紙‐サイズ度試験方法‐ステキヒト法」によるステキヒトサイズ度が１秒以下である原紙に、グアニジン系難燃剤とサイズ剤とが含浸されてなり、数１で求められる前記原紙への前記グアニジン系難燃剤と前記サイズ剤の合計の含浸率が１５％以上であり、かつ、前記サイズ剤の添加量が難燃剤１００質量部に対し０．１質量部以上であり、前記グアニジン系難燃剤の含浸によってＵＬ規格においてＵＬ９４Ｖ‐０及び／又はＵＬ９４ＶＴＭ‐０とし、前記ＰＡＮ系炭素繊維の含有によって近傍界用電波吸収材料測定装置であるネットワークアナライザーで求めた８５℃、１０００時間加熱処理前後の周波数２．４５４３ＧＨｚでの電波吸収率［ｄＢ］及び回路への影響度［ｄＢ］を−６ｄＢ以下とし、かつ、前記含浸させたサイズ剤によって、ＪＩＳ Ｐ ８１２２：２００４「紙及び板紙‐サイズ度試験方法‐ステキヒト法」によるステキヒトサイズ度が３秒以上であることを特徴とする。
（数１）難燃剤とサイズ剤の合計の含浸率（％）＝（原紙１ｍ ２ 当たりの含浸量（固形分換算）／含浸前原紙の坪量）×１００
The present invention intends to solve the above problems by repeatedly investigating impregnation of a guanidine flame retardant and a sizing agent on a base paper containing wood pulp and carbon fibers. That is, the electromagnetic wave suppression paper according to the present invention contains wood pulp and PAN-based carbon fiber as main fibers, and is JIS P 8122: 2004 made by single layer or multilayer without adding or externally adding a sizing agent. A base paper having a Steecht sizing degree of 1 second or less according to “Paper and paperboard—Sizing test method—Steecht method” is impregnated with a guanidine-based flame retardant and a sizing agent . The total impregnation ratio of the guanidine flame retardant and the sizing agent is 15% or more, and the amount of the sizing agent added is 0.1 parts by mass or more with respect to 100 parts by mass of the flame retardant. Network that is UL94V-0 and / or UL94VTM-0 in the UL standard by impregnation of the flame retardant, and is a near-field radio wave absorption material measuring device by containing the PAN-based carbon fiber 85 ° C. as determined by the analyzer 1000 hours of heat treatment wave absorption rate before and after the frequency 2.4543GHz a [dB] and the degree of influence on the circuit [dB] and below -6 dB, and the sizing agent obtained by the impregnation, JIS P 8122: 2004 "paper and paperboard-sizing test method-schiecht method" is characterized by a squeecht sizing of 3 seconds or more.
(Equation 1) Total impregnation ratio of flame retardant and sizing agent (%) = ( impregnation amount per 1 m 2 of base paper (solid content conversion) / basis weight of base paper before impregnation) × 100
原紙のステキヒトサイズ度を１秒以下とすることで、グアニジン系難燃剤とサイズ剤とを原紙に効率よく短時間で含浸させることができる。 A Stockigt sizing degree of the base paper is set to lower than or equal to 1 second, it can be impregnated in a short time efficiently and guanidine-based flame retardant and sizing a base paper.
本発明に係る電磁波抑制紙では、前記ＰＡＮ系炭素繊維は、繊維長が１〜５０ｍｍであり、かつ、木材パルプ１００質量部に対して５質量部以上の量が添加されている場合が包含される。 In the electromagnetic wave suppression paper according to the present invention, the PAN-based carbon fiber has a fiber length of 1 to 50 mm and includes an amount of 5 parts by mass or more added to 100 parts by mass of wood pulp. The
本発明に係る電磁波抑制紙では、前記電磁波抑制紙の一方の表面又は両面に、オーバーコート層が設けられていることが好ましい。防湿性が改善される。 In the electromagnetic wave suppression paper according to the present invention, it is preferable that an overcoat layer is provided on one surface or both surfaces of the electromagnetic wave suppression paper. Moisture resistance is improved.
本発明に係る電磁波抑制紙では、前記電磁波抑制紙の一方の表面に粘着剤層を有することが好ましい。粘着剤層を設けることで、本発明に係る電磁波抑制紙を、電子機器など電磁波を発生する機器に容易に貼付することができる。 The electromagnetic wave suppression paper according to the present invention preferably has an adhesive layer on one surface of the electromagnetic wave suppression paper. By providing the pressure-sensitive adhesive layer, the electromagnetic wave suppression paper according to the present invention can be easily attached to a device that generates an electromagnetic wave such as an electronic device.
本発明に係る電磁波抑制紙では、前記粘着剤層の表面に剥離紙が貼付されていることが好ましい。剥離紙を添付することで、ラベル用紙の形態で電磁波抑制紙を提供することができる。 In the electromagnetic wave suppression paper according to the present invention, it is preferable that a release paper is stuck on the surface of the pressure-sensitive adhesive layer. By attaching the release paper, the electromagnetic wave suppression paper can be provided in the form of label paper.
本発明に係る電磁波抑制紙は、加工が容易であり、鉄板と接触したときに錆の発生がなく、燃焼時の有毒ガスの発生がなく、ＵＬ規格においてＵＬ９４Ｖ−０及び／又はＵＬ９４ＶＴＭ−０の難燃性を有し、８５℃以上の環境条件下において耐熱性に優れ、しかもその電磁波抑制効果を低下させることがなく、さらにサイズ性を有している。 The electromagnetic wave suppression paper according to the present invention is easy to process, does not generate rust when in contact with an iron plate, does not generate toxic gas during combustion, and is UL94V-0 and / or UL94VTM-0 according to UL standards. It has flame retardancy, is excellent in heat resistance under an environmental condition of 85 ° C. or higher, and does not deteriorate its electromagnetic wave suppression effect, and further has size.
以下、本発明について実施形態を示して詳細に説明するが、本発明はこれらの記載に限定して解釈されない。また、発明の効果を奏する限り、実施形態を変形してもよい。 Hereinafter, although an embodiment is shown and explained in detail about the present invention, the present invention is limited to these descriptions and is not interpreted. In addition, the embodiment may be modified as long as the effects of the invention are achieved.
本発明は、主体繊維として木材パルプとＰＡＮ系炭素繊維とを含有し、サイズ剤を内添又は外添せずに単層又は多層で抄造されたＪＩＳ Ｐ ８１２２：２００４「紙及び板紙‐サイズ度試験方法‐ステキヒト法」によるステキヒトサイズ度が１秒以下である原紙に、グアニジン系難燃剤とサイズ剤とが含浸されてなり、数１で求められる前記原紙への前記グアニジン系難燃剤と前記サイズ剤の合計の含浸率が１５％以上であり、かつ、前記サイズ剤の添加量が難燃剤１００質量部に対し０．１質量部以上であり、前記グアニジン系難燃剤の含浸によってＵＬ規格においてＵＬ９４Ｖ‐０及び／又はＵＬ９４ＶＴＭ‐０とし、前記ＰＡＮ系炭素繊維の含有によって近傍界用電波吸収材料測定装置であるネットワークアナライザーで求めた８５℃、１０００時間加熱処理前後の周波数２．４５４３ＧＨｚでの電波吸収率［ｄＢ］及び回路への影響度［ｄＢ］を−６ｄＢ以下とし、かつ、前記含浸させたサイズ剤によって、ＪＩＳ Ｐ ８１２２：２００４「紙及び板紙‐サイズ度試験方法‐ステキヒト法」によるステキヒトサイズ度が３秒以上である。
（数１）難燃剤とサイズ剤の合計の含浸率（％）＝（原紙１ｍ ２ 当たりの含浸量（固形分換算）／含浸前原紙の坪量）×１００
The present invention includes wood pulp and PAN-based carbon fiber as main fibers, and JIS P 8122: 2004 “paper and paperboard-size degree, which is made in a single layer or multiple layers without adding or externally adding a sizing agent. The guanidine-based flame retardant and the sizing agent impregnated into a base paper having a squeicht sizing degree of 1 second or less according to the “Test method-Steechit method”, and the guanidine-based flame retardant and the The total impregnation ratio of the sizing agent is 15% or more, and the addition amount of the sizing agent is 0.1 part by mass or more with respect to 100 parts by mass of the flame retardant. 85 ° C. obtained by UL94V-0 and / or UL94VTM-0 and determined by a network analyzer which is a near-field electromagnetic wave absorption material measuring device by containing the PAN-based carbon fiber. 1000 hours of heat treatment wave absorption rate before and after the frequency 2.4543GHz [dB] and the degree of influence on the circuit [dB] and below -6 dB, and the sizing agent obtained by the impregnation, JIS P 8122: 2004 "Paper And the paperboard-sizing test method-schiecht method ", the squeecht sizing is 3 seconds or more.
(Equation 1) Total impregnation ratio of flame retardant and sizing agent (%) = ( impregnation amount per 1 m 2 of base paper (solid content conversion) / basis weight of base paper before impregnation) × 100
本発明で使用する木材パルプは製紙用パルプであり、広葉樹材若しくは針葉樹材を蒸解して得られる未晒若しくは晒化学パルプ、ＧＰ、サーモメカニカルパルプなどの機械パルプ、脱墨古紙パルプから選ばれたパルプを単独で使用し又は混合して使用する。 The wood pulp used in the present invention is a pulp for papermaking, and was selected from unbleached or bleached chemical pulp obtained by digesting hardwood or softwood, GP, mechanical pulp such as thermomechanical pulp, and deinked waste paper pulp Pulp is used alone or mixed.
本発明で使用する炭素繊維は、ＰＡＮ系炭素繊維である。ＰＡＮ系炭素繊維はアクリルニトリルモノマーとビニルモノマーの共重合体を紡糸したＰＡＮ繊維を、２００〜３００℃で空気酸化によって耐炎化処理し、続いて不活性ガス中で８００〜１３００℃で炭化して製造する。これに表面サイジングを施したものが市販の炭素繊維である。抄紙用原糸とする場合は、表面サイジング処理が一般的であるＰＡＮ系炭素繊維を、必要によって脱サイジング処理する。また、本発明においては、炭素繊維の繊維長が１〜５０ｍｍのものが抄紙上好適である。より好ましくは炭素繊維の繊維長が、３〜６ｍｍである。繊維長が１ｍｍ未満の場合は、繊維同士の絡み合いが少なくなり、機材の強度が低下する傾向があるという点で劣る場合がある。また、繊維長が５０ｍｍを超える場合は、繊維の分散媒体中への分散性が下がり、分散斑（ムラ）のある炭素繊維含有紙となる傾向があり劣る場合がある。また、炭素繊維の繊維径は２０μｍとすることが好ましい。 The carbon fiber used in the present invention is a PAN-based carbon fiber. The PAN-based carbon fiber is obtained by subjecting a PAN fiber obtained by spinning a copolymer of an acrylonitrile monomer and a vinyl monomer to flameproofing by air oxidation at 200 to 300 ° C., followed by carbonization at 800 to 1300 ° C. in an inert gas. To manufacture. Commercially available carbon fiber is obtained by subjecting it to surface sizing. In the case of making a papermaking yarn, a PAN-based carbon fiber, which is generally subjected to surface sizing treatment, is desized if necessary. In the present invention, carbon fibers having a fiber length of 1 to 50 mm are suitable for papermaking. More preferably, the fiber length of the carbon fiber is 3 to 6 mm. When the fiber length is less than 1 mm, the entanglement between the fibers decreases, and the strength of the equipment tends to decrease, which may be inferior. Further, when the fiber length exceeds 50 mm, the dispersibility of the fibers in the dispersion medium is lowered, and the carbon fiber-containing paper having dispersion spots (unevenness) tends to be inferior. The fiber diameter of the carbon fiber is preferably 20 μm.
さらに、本発明に係る電磁波抑制紙では、炭素繊維の含有量を多くすることで、電磁波抑制効果を高める。そこで、炭素繊維は対木材パルプ１００質量部に対して５質量部以上添加されていることが好ましい。炭素繊維をこのような添加量とすることで、近傍界用電波吸収材料測定装置であるネットワークアナライザーで求めた８５℃、１０００時間加熱処理前後の周波数２．４５４３ＧＨｚでの電波吸収率［ｄＢ］及び回路への影響度［ｄＢ］を−６ｄＢ以下とする。５質量部未満で添加した場合は、電磁波抑制性が劣る場合がある。より好ましくは、炭素繊維を対木材パルプ１００質量部に対して５〜２０質量部添加する。２０質量部を超えると抄紙性と経済性が劣る。なお、本発明の効果が奏する範囲で、炭素繊維を含有させるとともに、導電性粉体を添加して電磁波抑制効果を高めてもよい。 Furthermore, in the electromagnetic wave suppression paper according to the present invention, the electromagnetic wave suppression effect is enhanced by increasing the carbon fiber content. Then, it is preferable that 5 mass parts or more of carbon fiber is added with respect to 100 mass parts with respect to wood pulp. By setting the carbon fiber to such an addition amount, the radio wave absorption rate [dB] at a frequency of 2.4543 GHz before and after the heat treatment at 85 ° C. for 1000 hours obtained by a network analyzer which is a near-field radio wave absorption material measuring device and The influence degree [dB] on the circuit is set to -6 dB or less. When added at less than 5 parts by mass, the electromagnetic wave suppression property may be inferior. More preferably, 5-20 mass parts of carbon fibers are added with respect to 100 mass parts of wood pulp. When it exceeds 20 parts by mass, papermaking properties and economic efficiency are inferior. In addition, within the range with the effect of this invention, while containing carbon fiber, you may add electroconductive powder and heighten the electromagnetic wave suppression effect.
本発明に係る電磁波抑制紙の原紙を抄造するときは、前記木材パルプと前記炭素繊維とを混合し、主体繊維として紙料とする。このとき、木材パルプと炭素繊維のほかに、例えばガラス繊維、セラミック系繊維、金属繊維、レーヨン繊維、ポリオレフィン系繊維、ビニロン系繊維、アクリル系繊維、ポリエステル系繊維又はポリアミド系繊維を混合しても良いが、繊維成分としては木材パルプと炭素繊維とからなる形態とすることが好ましい。この紙料を用いて、公知の抄紙機、すなわち長網、円網、ハイブリッドフォーマー、ギャップフォーマーなどを用いて単層で又は多層で抄造し、プレス工程、乾燥工程を経て通常４０〜２５０ｇ／ｍ２、厚さ０．０３〜０．３ｍｍの原紙を作製する。抄紙方法は、特に限定されず酸性紙、中性紙又はアルカリ性紙のいずれであってもよい。 When making the base paper of the electromagnetic wave suppression paper according to the present invention, the wood pulp and the carbon fiber are mixed to form a paper material as a main fiber. At this time, in addition to wood pulp and carbon fiber, for example, glass fiber, ceramic fiber, metal fiber, rayon fiber, polyolefin fiber, vinylon fiber, acrylic fiber, polyester fiber or polyamide fiber may be mixed. Although it is good, the fiber component is preferably in the form of wood pulp and carbon fiber. Using this stock, it is made into a single layer or multiple layers using a known paper machine, that is, a long net, a circular net, a hybrid former, a gap former, etc., and usually 40 to 250 g through a pressing step and a drying step. / m 2, to prepare a base paper having a thickness of 0.03 to 0.3 mm. The papermaking method is not particularly limited, and any of acid paper, neutral paper, or alkaline paper may be used.
紙料中には、紙力剤、填料、硫酸バンド(硫酸アルミ二ウム)、歩留り向上剤、染料、蛍光染料などが適宜用いられる。 In the paper stock, a paper strength agent, a filler, a sulfate band (aluminum sulfate), a yield improver, a dye, a fluorescent dye, and the like are appropriately used.
紙力剤としては、澱粉、変性澱粉、ポリアクリルアミドなどが適宜用いられる。 As the paper strength agent, starch, modified starch, polyacrylamide and the like are appropriately used.
填料としては、炭酸カルシウム、タルク、クレー、二酸化チタンなどが適宜用いられる。 As the filler, calcium carbonate, talc, clay, titanium dioxide and the like are appropriately used.
歩留り向上剤としては、コロイダルシリカ、ポリアクリルアミド、ポリエチレンイミンなどが適宜用いられる。 As the yield improver, colloidal silica, polyacrylamide, polyethyleneimine and the like are appropriately used.
このようにして抄造された原紙は、ＪＩＳ Ｐ ８１２２：２００４「紙及び板紙‐サイズ度試験方法‐ステキヒト法」によるステキヒトサイズ度が１秒以下であることが好ましい。より好ましくは、ステキヒトサイズ度が０．５秒以下の原紙とする。ステキヒトサイズ度が１秒を超えると、難燃剤及びサイズ剤が含浸されにくいという問題が生じる。なお、原紙を抄造するときに紙料中にサイズ剤を内添又はサイズプレスでサイズ剤を外添しなければ、ステキヒトサイズ度が１秒以下の状態を達成しやすい。 The paper made in this way preferably has a Steecht sizing degree of 1 second or less according to JIS P 8122: 2004 “Paper and paperboard—Sizing test method—Steechtman method”. More preferably, the base paper has a Steecht sizing degree of 0.5 seconds or less. If the Steecht sizing degree exceeds 1 second, there arises a problem that the flame retardant and the sizing agent are hardly impregnated. In addition, when making a base paper, if the sizing agent is not added internally to the stock or the sizing agent is not added externally by a size press, a Steecht sizing degree of 1 second or less is easily achieved.
前記原紙に含浸させる難燃剤としては、ノンハロゲン系難燃剤が使用される。臭素、塩素などのハロゲン化合物からなる難燃剤は、燃焼条件によってはダイオキシンなどの有害物を発生する可能性があるので、本発明では用いない。ノンハロゲン系難燃剤としては、錆の発生が無いグアニジン、スルファミン酸グアニジン、リン酸グアニジンなどのグアニジン系誘導体が好ましい。これらのグアニジン系難燃剤は、単独又は２種以上組み合わせて用いられる。難燃剤として、グアニジン系難燃剤を使用すると、電磁波抑制紙を原因とする錆の発生がない。 As the flame retardant impregnated in the base paper, a non-halogen flame retardant is used. Flame retardants composed of halogen compounds such as bromine and chlorine are not used in the present invention because they may generate harmful substances such as dioxins depending on combustion conditions. As the non-halogen flame retardant, guanidine derivatives such as guanidine, guanidine sulfamate, and guanidine phosphate which do not generate rust are preferable. These guanidine-based flame retardants are used alone or in combination of two or more. When a guanidine-based flame retardant is used as a flame retardant, rust is not generated due to electromagnetic wave suppression paper.
グアニジン系難燃剤含浸液中にサイズ剤を添加し、サイズ剤も原紙に含浸させる。グアニジン系難燃剤とサイズ剤を同一液中に混合して原紙に含浸さることで、操業工程の簡素化及び効率化が図られ、これによるコスト削減効果がある。サイズ剤としては、アルキルケテンダイマー（ＡＫＤ）、アルケニル無水琥珀酸(ＡＳＡ)、中性ロジン、酸性ロジンなどが適宜用いられる。サイズ剤を含浸させる理由は、原紙への耐水性付与であり、これによって、本発明に係る電磁波抑制紙には耐水性という効果が表れる。 A sizing agent is added to the guanidine-based flame retardant impregnation solution, and the sizing agent is also impregnated into the base paper. By mixing the guanidine-based flame retardant and sizing agent in the same liquid and impregnating the base paper, the operation process can be simplified and improved in efficiency, thereby resulting in a cost reduction effect. As the sizing agent, alkyl ketene dimer (AKD), alkenyl succinic anhydride (ASA), neutral rosin, acidic rosin and the like are appropriately used. The reason for impregnating the sizing agent is to impart water resistance to the base paper, whereby the effect of water resistance appears in the electromagnetic wave suppressing paper according to the present invention.
前記原紙への難燃剤の含浸は、オンマシンサイズプレス装置又は含浸コーターで行われるが、これらに限定されるものではない。 The impregnation of the flame retardant into the base paper is performed with an on-machine size press apparatus or an impregnation coater, but is not limited thereto.
原紙へのグアニジン系難燃剤とサイズ剤の合計の含浸率は、原紙１００質量部に対し１０質量部以上の含浸を行うこととなる、１０％以上とすることが好ましい。本発明に係る電磁波抑制紙では、グアニジン系難燃剤の含浸量を多くすることで、難燃化効果を高め、ＵＬ規格においてＵＬ９４Ｖ‐０及び／又はＵＬ９４ＶＴＭ‐０とする。含浸率が１０％未満であると難燃化効果が不十分となりやすい。なお、含浸率が３０％を超えると使用量に見合う以上の難燃化効果が期待できず、経済的に不利である。より好ましくは、１５〜２５％である。難燃剤とサイズ剤の合計の含浸率は、数１によって求める。
（数１）難燃剤とサイズ剤の合計の含浸率（％）＝（原紙１ｍ２当たりの含浸量（固形分換算）／含浸前原紙の坪量）×１００
The total impregnation ratio of the guanidine-based flame retardant and the sizing agent to the base paper is preferably 10% or more, which results in 10 parts by mass or more of impregnation with respect to 100 parts by mass of the base paper. In the electromagnetic wave suppression paper according to the present invention, the flame retarding effect is enhanced by increasing the amount of impregnation of the guanidine-based flame retardant, and UL94V-0 and / or UL94VTM-0 in the UL standard. If the impregnation rate is less than 10%, the flame retarding effect tends to be insufficient. If the impregnation rate exceeds 30%, a flame retarding effect exceeding the amount used cannot be expected, which is economically disadvantageous. More preferably, it is 15 to 25%. The total impregnation rate of the flame retardant and the sizing agent is determined by Equation 1.
(Equation 1) Total impregnation ratio of flame retardant and sizing agent (%) = (impregnation amount per 1 m 2 of base paper (solid content conversion) / basis weight of base paper before impregnation) × 100
ここでサイズ剤の添加量は、電磁波抑制紙において、難燃剤１００質量部に対し０．１質量部以上であることが好ましい。より好ましくは、０．１５質量部〜０．５０質量部である。サイズ剤が０．５０質量部を超えると、サイズ度が頭打ちでコストアップになり、また０．１質量部未満で少なすぎるとサイズ度が低下し、サイズ性の効果が十分に発揮されない場合がある。本実施形態に係る電磁波抑制紙は、原紙に難燃剤と共にサイズ剤を含浸させることによって、電磁波抑制紙においてＪＩＳ Ｐ ８１２２：２００４「紙及び板紙‐サイズ度試験方法‐ステキヒト法」によるステキヒトサイズ度が３秒以上とする。ステキヒトサイズ度が３秒未満であると、電磁波抑制紙のサイズ性が劣る。 Here, the addition amount of the sizing agent is preferably 0.1 parts by mass or more with respect to 100 parts by mass of the flame retardant in the electromagnetic wave suppression paper. More preferably, it is 0.15 mass part-0.50 mass part. When the sizing agent exceeds 0.50 parts by mass, the sizing degree reaches a peak and the cost increases. When the sizing agent is less than 0.1 parts by mass, the sizing degree decreases, and the effect of sizing properties may not be sufficiently exhibited. is there. The electromagnetic wave suppressing paper according to the present embodiment is obtained by impregnating a base paper with a sizing agent together with a flame retardant, so that the electromagnetic wave suppressing paper is sterilized according to JIS P 8122: 2004 “Paper and paperboard—Sizing test method—Steech human method”. Is 3 seconds or more. If the Steecht sizing degree is less than 3 seconds, the size of the electromagnetic wave suppression paper is inferior.
難燃剤含浸後の乾燥方式は、特に限定されるものではなく、次に示す乾燥方式、すなわち、熱風乾燥、赤外乾燥、常温乾燥などが挙げられるが、その乾燥効率から赤外乾燥、熱風乾燥が好ましい。乾燥温度は８０〜１５０℃とすることが好ましい。 The drying method after impregnation with the flame retardant is not particularly limited, and examples include the following drying methods: hot air drying, infrared drying, room temperature drying, etc. Is preferred. The drying temperature is preferably 80 to 150 ° C.
また、平滑性向上、印刷品質向上などのため、前述の手法で得られた原紙を、表面処理することもできる。表面処理方法としては、スーパーカレンダー、マシンカレンダー、ソフトニップカレンダーなど、公知の表面処理装置を用いることができる。 In addition, the base paper obtained by the above-described method can be surface-treated in order to improve smoothness and print quality. As the surface treatment method, a known surface treatment apparatus such as a super calender, a machine calender, or a soft nip calender can be used.
（オーバーコート層の形成）
本実施形態では、防湿性改善の目的で、原紙上にオーバーコート層を設けることが好ましい。本実施形態で原紙上塗布されるオーバーコート層用の塗布組成物に含ませる樹脂は、特に限定されるものではなく、ポリエチレンテレフタレート樹脂、ポリプロピレン樹脂、塩化ビニル樹脂、フッ素樹脂、シリコーン樹脂、アクリル系樹脂、ポリウレタン樹脂、ポリカーボネート樹脂、ポリフェニレンオキサイド樹脂、ポリサルホン樹脂、ポリイミド樹脂、熱可塑ポリエステル樹脂、フェノール樹脂、ユリア樹脂、エポキシ樹脂、メラミン樹脂、シアリルフタレート樹脂、フラン樹脂などが挙げられる。より好ましくは、耐熱性及び難燃性を有しているものが好ましい。また、オーバーコート層に添加する難燃剤としては、ノンハロゲン系難燃剤が使用される。ノンハロゲン系難燃剤としては、無機系化合物或いはリン及び／又は窒素含有の有機系化合物として一般に市販されているものであり、無機化合物としては例えば水酸化マグネシウム、水酸化アルミニウムなどの金属水酸化物、三酸化アンチモン、酸化ジルコニウム、亜リン酸アルミ二ウムなどの金属酸化物、ホウ酸、ホウ酸亜鉛などのホウ素系化合物などの無機化合物であり、また有機系化合物としてはポリリン酸、ポリリン酸アンモニウム、アミノ基変性リン酸エステル、水酸基含有リン酸エステルなどのリン系化合物、メラミン若しくはメラミンシアヌレート化合物、メラミンリン酸塩、メラミンボレートなどのメラミン系誘導体、グアニジン若しくはスルファミン酸グアニジン、リン酸グアニジンなどのグアニジン系誘導体などのリン及び／又は窒素含有の有機系化合物が挙げられるが、これら例示化合物に限定されるものではない。これらのノンハロゲン系難燃性化合物は、単独又は２種以上組み合わせて用いられる。
(Formation of overcoat layer)
In the present embodiment, it is preferable to provide an overcoat layer on the base paper for the purpose of improving moisture resistance. The resin to be included in the coating composition for the overcoat layer applied on the base paper in this embodiment is not particularly limited, and is a polyethylene terephthalate resin, polypropylene resin, vinyl chloride resin, fluororesin, silicone resin, acrylic resin Examples include resins, polyurethane resins, polycarbonate resins, polyphenylene oxide resins, polysulfone resins, polyimide resins, thermoplastic polyester resins, phenol resins, urea resins, epoxy resins, melamine resins, sialyl phthalate resins, furan resins, and the like. More preferably, it has heat resistance and flame retardancy. Moreover, a non-halogen flame retardant is used as the flame retardant added to the overcoat layer. Non-halogen flame retardants are generally commercially available as inorganic compounds or phosphorus and / or nitrogen-containing organic compounds. Examples of inorganic compounds include metal hydroxides such as magnesium hydroxide and aluminum hydroxide, Inorganic compounds such as metal oxides such as antimony trioxide, zirconium oxide, aluminum phosphite, and boron compounds such as boric acid and zinc borate, and organic compounds include polyphosphoric acid, ammonium polyphosphate, Phosphorus compounds such as amino group-modified phosphate esters, hydroxyl group-containing phosphate esters, melamine or melamine cyanurate compounds, melamine derivatives such as melamine phosphate and melamine borate, guanidine such as guanidine or guanidine sulfamate, and guanidine phosphate System derivatives, etc. And / or nitrogen organic compound-containing, and the like, but not be limited to these exemplified compounds. These non-halogen flame retardant compounds are used alone or in combination of two or more.
本実施形態では、前記のような塗布組成物のオーバーコート用樹脂を原紙上へ塗布するには、公知のコーター、例えばパイプコーター、ブレードコーター、エアーナイフコーター、ロールコーター、リバースロールコーター、バーコーター、カーテンコーター、ダイコーター、グラビアコーター、チャンプレックスコーター、スプレーコーターなどから選ばれたコーターを用いて、一層又は多層に分けて塗布される。なお、オーバーコート用樹脂は、電磁波抑制紙の少なくとも片面に設けられる。また、オーバーコート用樹脂を原紙上へ塗布は、原紙への難燃剤及びサイズ剤の含浸した後の原紙に対して行うことが好ましい。 In the present embodiment, a known coater such as a pipe coater, a blade coater, an air knife coater, a roll coater, a reverse roll coater, a bar coater is used to apply the overcoat resin of the coating composition as described above onto the base paper. Using a coater selected from a curtain coater, a die coater, a gravure coater, a champlex coater, a spray coater, etc., it is applied in one layer or in multiple layers. The overcoat resin is provided on at least one side of the electromagnetic wave suppression paper. The overcoat resin is preferably applied to the base paper after impregnating the base paper with a flame retardant and a sizing agent.
オーバーコート層の厚さは、特に制限されないが、通常１〜２０μｍ程度であり、好ましくは３〜１０μｍである。１μｍ未満であると防湿性の改善効果がなく、２０μｍを超えるとコスト的に好ましくない。 The thickness of the overcoat layer is not particularly limited, but is usually about 1 to 20 μm, preferably 3 to 10 μm. If it is less than 1 μm, there is no effect of improving moisture resistance, and if it exceeds 20 μm, it is not preferable in terms of cost.
オーバーコート層用の塗布組成物の塗布後の乾燥方式は、特に限定されるものではなく、次の乾燥方式、すなわち、熱風乾燥、赤外線乾燥、常温乾燥などが挙げられるが、その乾燥効率から赤外線乾燥、熱風乾燥が好ましい。乾燥温度は８０〜１５０℃とすることが好ましい。 The drying method after application of the coating composition for the overcoat layer is not particularly limited, and examples include the following drying methods, that is, hot air drying, infrared drying, room temperature drying, etc. Drying and hot air drying are preferred. The drying temperature is preferably 80 to 150 ° C.
（粘着シートの形成）
粘着シートは、家庭用、商業用、工業用など非常に広範囲に使用される。本発明の具体的な利用方法としては、各種電気機器への電磁波抑制ラベルなどである。粘着シートの構成は、支持体と剥離紙との間に粘着剤層を設けたものであり、支持体には本発明の炭素繊維を抄き込んだ含浸用原紙に難燃剤とサイズ剤を含浸させた本発明の電磁波抑制紙の一つを使用する。
(Formation of adhesive sheet)
The pressure-sensitive adhesive sheet is used in a very wide range such as home use, commercial use and industrial use. A specific method of using the present invention is an electromagnetic wave suppression label for various electric devices. The structure of the pressure-sensitive adhesive sheet is a structure in which a pressure-sensitive adhesive layer is provided between the support and the release paper, and the support is impregnated with the flame retardant and the sizing agent on the impregnated base paper in which the carbon fiber of the present invention is formed. One of the electromagnetic wave suppression papers of the present invention is used.
一方、粘着剤層の表面には剥離紙が貼付されていることが好ましく、上質紙などの非塗工紙、一般コート紙、アート紙などの塗工紙、グラシン紙、ポリエチレン若しくはポリエチレンテレフタレートなどを用いたフィルム又はフィルムラミネート紙を用いる。目的に応じて、剥離剤としてシリコーン樹脂及び／又はフッ素樹脂を、乾燥重量で０．１〜３ｇ／ｍ２程度塗布、乾燥したものが使用できる。 On the other hand, it is preferable that a release paper is attached to the surface of the pressure-sensitive adhesive layer, such as non-coated paper such as fine paper, general coated paper, coated paper such as art paper, glassine paper, polyethylene or polyethylene terephthalate. The used film or film laminated paper is used. Depending on the purpose, a silicone resin and / or fluororesin applied as a release agent and applied in a dry weight of about 0.1 to 3 g / m 2 and dried can be used.
粘着剤層に用いる粘着剤ポリマーとしては、天然ゴム系、合成ゴム系、ポリウレタン系、アクリル系ポリマー、酢酸ビニル系ポリマー、酢酸ビニル‐アクリル酸エステルコポリマー、酢酸ビニル‐エチレンコポリマーなどの各種粘着剤を目的に応じて使用する。また粘着剤層には、ノンハロゲン系難燃剤を適宜添加してもよい。 Various adhesives such as natural rubber, synthetic rubber, polyurethane, acrylic polymer, vinyl acetate polymer, vinyl acetate-acrylic acid ester copolymer, vinyl acetate-ethylene copolymer are used as the adhesive polymer used in the adhesive layer. Use according to purpose. In addition, a non-halogen flame retardant may be appropriately added to the pressure-sensitive adhesive layer.
前述のように形成した本実施形態に係る電磁波抑制紙は、粘着剤層を設けた場合を含めて、全体の厚さが０．３ｍｍ以下とすることが好ましい。全体が０．３ｍｍ以下の厚さの電磁波抑制紙とすることで、電子機器などの電磁波を発生する機器の部品間のクリアランスに差し込むことが可能となり、かつ、軽量となる。より好ましくは、０．１ｍｍ〜０．２ｍｍである。また、本実施形態に係る電磁波抑制紙の電磁波抑制効果は、近傍界用電波吸収材料測定法であるＳ−パラメーター法（Ｓ−２１）を用いて測定した、周波数２．４５４３ＧＨｚでの電波吸収率［ｄＢ］及び回路への影響度［ｄＢ］がいずれも−６ｄＢ以下であることが好ましい。電波吸収率［ｄＢ］及び回路への影響度［ｄＢ］が−６ｄＢを超えると、電磁波抑制率が７５％未満となるので効果が薄い。 The electromagnetic wave suppression paper according to the present embodiment formed as described above preferably has an overall thickness of 0.3 mm or less including the case where an adhesive layer is provided. By using an electromagnetic wave suppression paper having a thickness of 0.3 mm or less as a whole, the paper can be inserted into the clearance between parts of an electronic device or other device that generates an electromagnetic wave, and is lightweight. More preferably, it is 0.1 mm-0.2 mm. In addition, the electromagnetic wave suppression effect of the electromagnetic wave suppression paper according to the present embodiment is measured by using the S-parameter method (S-21), which is a near-field radio wave absorption material measurement method, at a frequency of 2.4543 GHz. Both [dB] and the degree of influence [dB] on the circuit are preferably −6 dB or less. When the radio wave absorption rate [dB] and the influence degree [dB] on the circuit exceed −6 dB, the electromagnetic wave suppression rate becomes less than 75%, and thus the effect is weak.
次に実施例を挙げて本発明をより具体的に説明するが、本発明はこれら実施例に限定されるものではない。また、例中の「部」及び「％」は、特に断らない限り「質量部」及び「質量％」を示す。 EXAMPLES Next, although an Example is given and this invention is demonstrated more concretely, this invention is not limited to these Examples. In the examples, “parts” and “%” indicate “parts by mass” and “mass%” unless otherwise specified.
（実施例１）
＜原紙の作製＞
原料は、ＮＢＫＰ（針葉樹晒クラフトパルプ）５０部と、ＬＢＫＰ（広葉樹晒クラフトパルプ）４２部と、炭素繊維８部（商品名トレカＴ０１０、繊維長３ｍｍ品、東レ社製）とからなるカナダ標準濾水度（以下、「ＣＳＦ」と略す。）４００〜４２０ｍｌのパルプスラリーに、紙力増強剤(カチオン化澱粉、ネオタック４０Ｔ、日本食品化工社製)を対パルプ１％、硫酸バンド（テクノ北越社製）を対パルプ２％添加し、坪量７５．５ｇ／ｍ２の原紙を抄造し、含浸用原紙を得た。この含浸用原紙は、厚さが０．１０４ｍｍ、密度が０．７３ｇ／ｃｍ３、ステキヒトサイズ度が１秒であった。
＜電磁波抑制紙の作製＞
前記含浸用原紙を用いて、水で２７％濃度に希釈したリン酸グアニジン誘導体のノンハロゲン系難燃剤（ビゴールＮｏ４１５、４７％濃度品、大京化学社製）にＡＫＤ系サイズ剤（ＳＥ２３６０、２０％濃度品、星光ＰＭＣ社製）を対液０．２５％（荷姿）添加した含浸液を、含浸コーターにて難燃剤とサイズ剤の含浸率が１９．２％になるように含浸後、エアドライヤーで熱風乾燥し、実施例１の電磁波抑制紙を得た。なお、ＡＫＤ系サイズ剤は難燃剤１００質量部に対して０．１８５質量部添加されていた。また、電磁波抑制紙のステキヒトサイズ度は、３４秒であった。
Example 1
<Preparation of base paper>
The raw material is a Canadian standard filter consisting of 50 parts NBKP (conifer bleached kraft pulp), 42 parts LBKP (hardwood bleached kraft pulp), and 8 parts carbon fiber (trade name Toray T010, fiber length 3 mm, manufactured by Toray Industries, Inc.) Water strength (hereinafter abbreviated as “CSF”) 400-420 ml of pulp slurry, paper strength enhancer (cationized starch, Neotac 40T, manufactured by Nippon Shokuhin Kako Co., Ltd.) against pulp 1%, sulfate band (Techno Hokuetsu) Manufactured) was added to 2% pulp, and a base paper having a basis weight of 75.5 g / m 2 was made to obtain a base paper for impregnation. This base paper for impregnation had a thickness of 0.104 mm, a density of 0.73 g / cm 3 , and a Steecht sizing degree of 1 second.
<Production of electromagnetic wave suppression paper>
A non-halogen flame retardant of a guanidine phosphate derivative (Bigol No. 415, 47% concentration product, manufactured by Daikyo Chemical Co., Ltd.) diluted to 27% with water using the above impregnating base paper and an AKD sizing agent (SE 2360, 20%) After impregnating an impregnating solution containing 0.25% (packed form) of the concentration product, manufactured by Seiko PMC, with an impregnation coater so that the impregnation ratio of the flame retardant and the sizing agent is 19.2%, air It dried with hot air with the dryer and obtained the electromagnetic wave suppression paper of Example 1. The AKD sizing agent was added in an amount of 0.185 parts by mass with respect to 100 parts by mass of the flame retardant. Further, the degree of sizing of the electromagnetic wave suppression paper was 34 seconds.
［電磁波抑制紙の物性評価］
このようにして得られた電磁波抑制紙において、坪量、厚さ、水の浸透性、難燃性、電磁波抑制性、耐熱性、発錆性を含めた物性の評価を、２３℃、５０％ＲＨで調湿後、次の方法に準拠して行い、評価結果を表１に示した。
[Physical property evaluation of electromagnetic wave suppression paper]
In the electromagnetic wave suppression paper thus obtained, the physical properties including basis weight, thickness, water permeability, flame retardancy, electromagnetic wave suppression property, heat resistance and rusting property were evaluated at 23 ° C. and 50%. After conditioning with RH, it was performed according to the following method, and the evaluation results are shown in Table 1.
［坪量］
ＪＩＳ Ｐ ８１２４：１９９８「紙及び板紙−坪量測定方法」。
[Basis weight]
JIS P 8124: 1998 “Paper and paperboard—Method of measuring basis weight”.
［厚さ］
ＪＩＳ Ｐ ８１１８：１９９８「紙及び板紙−厚さ及び密度の試験方法」。原紙と電磁波抑制紙の厚さの差を塗被層の厚さとした。
[thickness]
JIS P 8118: 1998 "Paper and paperboard-Test methods for thickness and density". The difference in thickness between the base paper and the electromagnetic wave suppression paper was taken as the thickness of the coating layer.
［水の浸透性］
原紙の表面に水を垂らして浸透具合を目視で評価した。
＜評価基準＞
×：水の浸透有り、電磁波抑制紙として実用できない。
△：水の浸透少し有り、電磁波抑制紙として実用上の問題がある。
○：水の浸透なく、電磁波抑制紙として実用上の問題がない。
[Water permeability]
Water was dropped on the surface of the base paper and the penetration condition was visually evaluated.
<Evaluation criteria>
X: Water permeates and cannot be used as electromagnetic wave suppression paper.
Δ: There is little penetration of water, and there are practical problems as electromagnetic wave suppression paper.
○: No penetration of water, no problem in practical use as electromagnetic wave suppression paper.
［電磁波抑制性］
近傍界用電波吸収材料測定装置であるネットワークアナライザー（アンリツ３７シリーズ)を用いて、Ｓ−パラメーター法にて周波数２．４５４３ＧＨｚでの電波吸収率［ｄＢ］及び回路への影響度［ｄＢ］を測定した。電波吸収率［ｄＢ］、回路への影響度［ｄＢ］とも−６ｄＢ以下なら電磁波抑制紙として使えるレベルと判断される。また、−１０ｄＢなら電波吸収率［ｄＢ］は良好であり、回路への影響度［ｄＢ］もないと判断される（９０％の電磁波抑制率）。さらに、−２０ｄＢであれば９９％、−３０ｄＢであれば９９．９％の電磁波抑制率となる。
＜評価基準＞
×：電波吸収率［ｄＢ］及び回路への影響度［ｄＢ］の少なくとも一方が−６ｄＢより大きく、電磁波抑制紙として不可。
△：電波吸収率［ｄＢ］及び回路への影響度［ｄＢ］の両方が−６ｄＢ〜−１０ｄＢであり或いは一方が−６ｄＢ〜−１０ｄＢで他方が−１０ｄＢ未満であり、電磁波抑制紙として使えるレベルである。
○:電磁波吸収率［ｄＢ］及び回路への影響度［ｄＢ］とも−１０ｄＢ未満であり、電磁波抑制紙として極めて良好なレベルである。
[Electromagnetic wave suppression]
Using a network analyzer (Anritsu 37 series), which is a near-field electromagnetic wave absorption material measuring device, the electromagnetic wave absorption rate [dB] at a frequency of 2.4543 GHz and the degree of influence on the circuit [dB] are measured by the S-parameter method. did. If both the radio wave absorption rate [dB] and the influence level [dB] on the circuit are −6 dB or less, it is determined that the electromagnetic wave suppression paper can be used. On the other hand, if it is −10 dB, it is determined that the radio wave absorption rate [dB] is good and there is no influence level [dB] on the circuit (90% electromagnetic wave suppression rate). Furthermore, the electromagnetic wave suppression rate is 99% for -20 dB, and 99.9% for -30 dB.
<Evaluation criteria>
X: At least one of the radio wave absorption rate [dB] and the influence degree [dB] on the circuit is larger than −6 dB, and cannot be used as the electromagnetic wave suppression paper.
Δ: Both the electromagnetic wave absorption rate [dB] and the influence degree [dB] on the circuit are −6 dB to −10 dB, or one is −6 dB to −10 dB and the other is less than −10 dB, and can be used as electromagnetic wave suppression paper. It is.
A: Both the electromagnetic wave absorption rate [dB] and the influence degree [dB] on the circuit are less than −10 dB, which is a very good level as an electromagnetic wave suppression paper.
［耐熱性］
乾燥機中で８５℃、１０００時間加熱処理後の周波数２．４５４３ＧＨｚでの電波吸収率［ｄＢ］及び回路への影響度［ｄＢ］を前記の測定法にて同一の基準で評価した。
[Heat-resistant]
The radio wave absorption rate [dB] at a frequency of 2.4543 GHz after heat treatment at 85 ° C. for 1000 hours in a dryer and the degree of influence [dB] on the circuit were evaluated by the same method as described above.
［難燃性］
安全規格ＵＬ（Ｕｎｄｅｒｗｒｉｔｅｒｓ Ｌａｂｏｒａｔｏｒｉｅｓ Ｉｎｃ．）９４「Ｔｅｓｔｓ ｆｏｒ Ｆｌａｍｍａｂｉｌｉｔｙ ｏｆ Ｐｌａｓｔｉｃ Ｍａｔｅｒｉａｌｓ ｆｏｒ Ｐａｒｔｓ ｉｎ Ｄｅｖｉｃｅｓ ａｎｄ Ａｐｐｌｉａｎｃｅｓ，ｆｉｆｔｈ ｅｄｉｔｉｏｎ，（Ｅｄｉｔｉｏｎ Ｄａｔｅ Ｏｃｔｏｂｅｒ ２９，１９９６）」垂直燃焼試験（Ｖ−０〜Ｖ−２）、薄手材料垂直燃焼試験（ＶＴＭ−０〜ＶＴＭ−２）によって評価した。
[Flame retardance]
Safety Standards UL (Underwriters Laboratories Inc.) 94 “Tests for Flammability of Plastic Materials for Partis in Devices and Appliances and Oditions, 19-V The material was evaluated by a vertical combustion test (VTM-0 to VTM-2).
［発錆性］
試料と鉄板を圧締用リングで接触固定し、４０℃、９０％ＲＨ恒温恒湿槽中で３日間放置後の錆の発生具合を評価した。
＜評価基準＞
×：錆発生有り、電磁波抑制紙として実用できない。
○: 錆発生無く、電磁波抑制紙として実用上の問題がない。
[Rusting]
The sample and the iron plate were fixed in contact with a pressing ring, and the degree of rust after standing for 3 days in a constant temperature and humidity chamber at 40 ° C. and 90% RH was evaluated.
<Evaluation criteria>
X: Rust is generated and cannot be used as electromagnetic wave suppression paper.
○: Rust does not occur and there is no practical problem as electromagnetic wave suppression paper.
［ステキヒトサイズ度］
ＪＩＳ Ｐ ８１２２：２００４「紙及び板紙‐サイズ度試験方法‐ステキヒト法」。
[Stick human sizing degree]
JIS P 8122: 2004 “Paper and paperboard—Sizing test method—Stechit method”.
（実施例２）
実施例１において、水で２７％濃度に希釈したリン酸グアニジン誘導体のノンハロゲン系難燃剤（ビゴールＮｏ４１５、４７％濃度品、大京化学社製）にＡＫＤ系サイズ剤（ＳＥ２３６０、２０％濃度品、星光ＰＭＣ社製）を対液０．５％（荷姿）添加した以外は、実施例１と同様にして実施例２の電磁波抑制紙を得た。難燃剤とサイズ剤の含浸率は１９．２％であり、サイズ剤は難燃剤１００部に対して０．３７部添加されていた。また、電磁波抑制紙のステキヒトサイズ度は、５０秒であった。
(Example 2)
In Example 1, an AKD sizing agent (SE2360, 20% concentration product) was added to a non-halogen flame retardant of a guanidine phosphate derivative (Bigol No415, 47% concentration product, manufactured by Daikyo Chemical Co., Ltd.) diluted to 27% with water. An electromagnetic wave suppression paper of Example 2 was obtained in the same manner as in Example 1 except that 0.5% (packing form) of the solution was added. The impregnation ratio of the flame retardant and the sizing agent was 19.2%, and 0.37 part of the sizing agent was added to 100 parts of the flame retardant. In addition, the degree of sizing of the electromagnetic wave suppression paper was 50 seconds.
（実施例３）
実施例１において、難燃剤とサイズ剤の含浸率が２６．４％になるように含浸した以外は、実施例１と同様にして実施例３の電磁波抑制紙を得た。なお、サイズ剤は難燃剤１００部に対して０．１８５部添加されていた。また、電磁波抑制紙のステキヒトサイズ度は、３６秒であった。
(Example 3)
In Example 1, the electromagnetic wave suppression paper of Example 3 was obtained in the same manner as in Example 1 except that the impregnation ratio of the flame retardant and the sizing agent was 26.4%. In addition, 0.185 parts of sizing agents were added to 100 parts of the flame retardant. Further, the sizing degree of the electromagnetic wave suppression paper was 36 seconds.
（実施例４）
実施例１において、原料をＮＢＫＰ５０部、ＬＢＫＰ４５部、炭素繊維５部とした以外は、実施例１と同様にして実施例４の電磁波抑制紙を得た。原紙の坪量は、９５．３ｇ／ｍ２であり、厚さが０．１０５ｍｍ、密度が０．９１ｇ／ｃｍ３、ステキヒトサイズ度が１秒であった。また、難燃剤とサイズ剤の含浸率は１９．２％であった。なお、サイズ剤は難燃剤１００部に対して０．１８５部添加されていた。また、電磁波抑制紙のステキヒトサイズ度は、３１秒であった。
Example 4
In Example 1, the electromagnetic wave suppression paper of Example 4 was obtained in the same manner as in Example 1 except that the raw materials were NBKP 50 parts, LBKP 45 parts, and carbon fiber 5 parts. The basis weight of the base paper was 95.3 g / m 2 , the thickness was 0.105 mm, the density was 0.91 g / cm 3 , and the Steecht sizing degree was 1 second. The impregnation ratio of the flame retardant and the sizing agent was 19.2%. In addition, 0.185 parts of sizing agents were added to 100 parts of the flame retardant. Further, the degree of sizing of the electromagnetic wave suppression paper was 31 seconds.
（実施例５）
実施例１において、両面ポリラミ紙（坪量８５ｇ／ｍ２）を剥離基材として、その片面に溶剤シリコーン剥離剤（商品名：ＫＳ−７７６、信越シリコーン社製）を１ｇ／ｍ２塗布、乾燥し、シリコーン剥離層を形成する。さらに、該シリコーン剥離層の上にアクリル系粘着剤（商品名：ＢＰＳ５３０３−２０Ｊ１／ＢＨＳ８５１５＝１００／１．５、東洋インキ社製）を２０ｇ／ｍ２塗布、乾燥し、粘着剤層を形成した。該粘着剤層を電磁波抑制紙の片面に貼り合わせて粘着シートを製造した以外は、実施例１と同様にして実施例５の電磁波抑制紙を得た。また、電磁波抑制紙のステキヒトサイズ度は、３５秒であった。
(Example 5)
In Example 1, a double-sided polylaminated paper (basis weight 85 g / m 2 ) was used as a release substrate, and a solvent silicone release agent (trade name: KS-776, manufactured by Shin-Etsu Silicone Co.) was applied 1 g / m 2 on one side and dried. And a silicone release layer is formed. Furthermore, 20 g / m 2 of an acrylic pressure-sensitive adhesive (trade name: BPS5303-20J1 / BHS8515 = 100 / 1.5, manufactured by Toyo Ink Co., Ltd.) was applied onto the silicone release layer and dried to form a pressure-sensitive adhesive layer. . An electromagnetic wave suppression paper of Example 5 was obtained in the same manner as in Example 1 except that the pressure-sensitive adhesive layer was bonded to one side of the electromagnetic wave suppression paper to produce an adhesive sheet. Further, the degree of sizing of the electromagnetic wave suppression paper was 35 seconds.
（実施例６）
実施例１において、オーバーコート層となるスチレンアクリル系樹脂（商品名：ジョンクリルＪ−４５０、ジョンソンポリマー社製、Ｔｇ＝１６℃）を５ｇ／ｍ２塗布した以外は、実施例１と同様にして実施例６の電磁波抑制紙を得た。また、電磁波抑制紙のステキヒトサイズ度は、１５０秒であった。
(Example 6)
In Example 1, the same procedure as in Example 1 was applied except that 5 g / m 2 of styrene acrylic resin (trade name: Jonkrill J-450, manufactured by Johnson Polymer Co., Ltd., Tg = 16 ° C.) serving as the overcoat layer was applied. Thus, the electromagnetic wave suppression paper of Example 6 was obtained. In addition, the degree of stiffness of the electromagnetic wave suppression paper was 150 seconds.
（実施例７）
実施例１において、ＡＫＤ系サイズ剤を対液０．１０％（荷姿）添加した以外は、実施例１と同様にして実施例７の電磁波抑制紙を得た。難燃剤とサイズ剤の含浸率は１９．２％であった。なお、サイズ剤は難燃剤１００部に対して０．７４１部添加されていた。また、電磁波抑制紙のステキヒトサイズ度は、４７秒であった。
(Example 7)
In Example 1, an electromagnetic wave suppression paper of Example 7 was obtained in the same manner as Example 1 except that 0.10% (packing form) of AKD sizing agent was added. The impregnation ratio of the flame retardant and the sizing agent was 19.2%. The sizing agent was added in an amount of 0.741 parts per 100 parts of the flame retardant. In addition, the degree of sizing of the electromagnetic wave suppression paper was 47 seconds.
（比較例１）
実施例１において、難燃剤及びサイズ剤を共に含浸させなかった以外は、実施例１と同様にして比較例１の電磁波抑制紙を得た。また、電磁波抑制紙のステキヒトサイズ度は、０秒であった。
(Comparative Example 1)
In Example 1, the electromagnetic wave suppression paper of Comparative Example 1 was obtained in the same manner as in Example 1 except that both the flame retardant and the sizing agent were not impregnated. In addition, the degree of sizing of the electromagnetic wave suppression paper was 0 seconds.
（比較例２）
実施例１において、ＡＫＤ系サイズ剤を対液０．１％（荷姿）添加した以外は、実施例１と同様にして比較例２の電磁波抑制紙を得た。難燃剤とサイズ剤の含浸率は１９．２％であった。なお、サイズ剤は難燃剤１００部に対して０．０７４部添加されていた。また、電磁波抑制紙のステキヒトサイズ度は、０秒であった。
(Comparative Example 2)
In Example 1, an electromagnetic wave suppression paper of Comparative Example 2 was obtained in the same manner as Example 1 except that 0.1% (packing form) of AKD sizing agent was added. The impregnation ratio of the flame retardant and the sizing agent was 19.2%. Note that 0.074 parts of the sizing agent was added to 100 parts of the flame retardant. In addition, the degree of sizing of the electromagnetic wave suppression paper was 0 seconds.
（比較例３）
実施例１において、ＡＫＤ系サイズ剤を対液０．１２５％（荷姿）添加した以外は、実施例１と同様にして比較例３の電磁波抑制紙を得た。難燃剤とサイズ剤の含浸率は１９．２％であった。なお、サイズ剤は難燃剤１００部に対して０．０９３部添加されていた。また、電磁波抑制紙のステキヒトサイズ度は、２秒であった。
(Comparative Example 3)
In Example 1, an electromagnetic wave suppression paper of Comparative Example 3 was obtained in the same manner as in Example 1 except that 0.125% (packing form) of the AKD sizing agent was added. The impregnation ratio of the flame retardant and the sizing agent was 19.2%. Note that 0.093 part of the sizing agent was added to 100 parts of the flame retardant. In addition, the degree of sizing of the electromagnetic wave suppression paper was 2 seconds.
（比較例４）
実施例１において、難燃剤とサイズ剤の含浸率が８％になるように含浸した以外は、実施例１と同様にして比較例４の電磁波抑制紙を得た。なお、サイズ剤は難燃剤１００部に対して０．１８５部添加されていた。また、電磁波抑制紙のステキヒトサイズ度は、３０秒であった。
(Comparative Example 4)
In Example 1, the electromagnetic wave suppression paper of Comparative Example 4 was obtained in the same manner as in Example 1 except that the impregnation ratio of the flame retardant and the sizing agent was 8%. In addition, 0.185 parts of sizing agents were added to 100 parts of the flame retardant. Further, the degree of sizing of the electromagnetic wave suppression paper was 30 seconds.
（比較例５）
実施例１において、水で２７％濃度に希釈した無機及び有機リン系窒素化合物の難燃剤（ピロガードＦ−４００Ｎ、５０％濃度品、第一工業製薬社製）を使用した以外は、実施例１と同様にして比較例５の電磁波抑制紙を得た。難燃剤とサイズ剤の含浸率は１９．２％であった。なお、サイズ剤は難燃剤１００部に対して０．１８５部添加されていた。また、電磁波抑制紙のステキヒトサイズ度は、３７秒であった。
(Comparative Example 5)
In Example 1, except that an inorganic and organic phosphorus nitrogen compound flame retardant diluted with water to a concentration of 27% (Pyroguard F-400N, 50% concentration product, manufactured by Daiichi Kogyo Seiyaku Co., Ltd.) was used. In the same manner, an electromagnetic wave suppression paper of Comparative Example 5 was obtained. The impregnation ratio of the flame retardant and the sizing agent was 19.2%. In addition, 0.185 parts of sizing agents were added to 100 parts of the flame retardant. In addition, the degree of sizing of the electromagnetic wave suppression paper was 37 seconds.
（比較例６）
実施例１において、原料をＮＢＫＰ５０部、ＬＢＫＰ５０部とし、炭素繊維を含有させなかった以外は、実施例１と同様にして比較例６の電磁波抑制紙を得た。含浸用原紙は、厚さが０．１０６ｍｍ、密度が０．７１ｇ／ｃｍ３、ステキヒトサイズ度が１秒であった。また、難燃剤とサイズ剤の含浸率は１９．２％であった。なお、サイズ剤は難燃剤１００部に対して０．１８５部添加されていた。また、電磁波抑制紙のステキヒトサイズ度は、３６秒であった。
(Comparative Example 6)
In Example 1, the electromagnetic wave suppression paper of Comparative Example 6 was obtained in the same manner as in Example 1 except that the raw materials were NBKP 50 parts and LBKP 50 parts, and no carbon fiber was contained. The impregnating base paper had a thickness of 0.106 mm, a density of 0.71 g / cm 3 , and a Steecht sizing degree of 1 second. The impregnation ratio of the flame retardant and the sizing agent was 19.2%. In addition, 0.185 parts of sizing agents were added to 100 parts of the flame retardant. Further, the sizing degree of the electromagnetic wave suppression paper was 36 seconds.
（比較例７）
実施例１において、原料をＮＢＫＰ５０部、ＬＢＫＰ４７部、炭素繊維３部とした以外は、実施例１と同様にして比較例７の電磁波抑制紙を得た。含浸用原紙は、厚さが０．１０９ｍｍ、密度が０．６９ｇ／ｃｍ３、ステキヒトサイズ度が１秒であった。また、難燃剤とサイズ剤の含浸率は１９．２％であった。なお、サイズ剤は難燃剤１００部に対して０．１８５部添加されていた。また、電磁波抑制紙のステキヒトサイズ度は、３５秒であった。
(Comparative Example 7)
In Example 1, the electromagnetic wave suppression paper of Comparative Example 7 was obtained in the same manner as in Example 1 except that the raw materials were NBKP 50 parts, LBKP 47 parts, and carbon fiber 3 parts. The impregnating base paper had a thickness of 0.109 mm, a density of 0.69 g / cm 3 , and a Steecht sizing degree of 1 second. The impregnation ratio of the flame retardant and the sizing agent was 19.2%. In addition, 0.185 parts of sizing agents were added to 100 parts of the flame retardant. Further, the degree of sizing of the electromagnetic wave suppression paper was 35 seconds.
（比較例８）
実施例１において、ＡＫＤ系サイズ剤を対液０．０５％（荷姿）添加した以外は、実施例１と同様にして比較例８の電磁波抑制紙を得た。難燃剤とサイズ剤の含浸率は１９．２％であった。なお、サイズ剤は難燃剤１００部に対して０．０３７部添加されていた。また、電磁波抑制紙のステキヒトサイズ度は、０秒であった。
(Comparative Example 8)
In Example 1, the electromagnetic wave suppression paper of Comparative Example 8 was obtained in the same manner as Example 1 except that 0.05% (packing form) of the AKD sizing agent was added. The impregnation ratio of the flame retardant and the sizing agent was 19.2%. Note that 0.037 parts of the sizing agent was added to 100 parts of the flame retardant. In addition, the degree of sizing of the electromagnetic wave suppression paper was 0 seconds.
実施例１〜７はいずれも、水の浸透性がなく、難燃性、電磁波抑制性及び耐熱性が優れ、錆の発生がなかった。 All of Examples 1 to 7 had no water permeability, were excellent in flame retardancy, electromagnetic wave suppression and heat resistance, and did not generate rust.
比較例１は、難燃剤及びサイズ剤を含浸させなかったので、水が浸透し、また、難燃性が得られなかった。比較例２、比較例３及び比較例８は、サイズ剤の含浸量が少なく、電磁波抑制紙のステキヒドサイズ度が３秒未満であり、水の浸透性の評価が不良であった。比較例４は、難燃剤の含浸量が少なく、難燃性が得られなかった。比較例５は、難燃剤としてグアニジン系難燃剤を使用しなかったので、錆が発生した。比較例６は、炭素繊維を含有させなかったので、電磁波抑制効果が得られなかった。比較例７は炭素繊維の含有量が不足し、電磁波抑制効果が不十分であった。 Since Comparative Example 1 was not impregnated with a flame retardant and a sizing agent, water penetrated and flame retardancy was not obtained. In Comparative Example 2, Comparative Example 3 and Comparative Example 8, the amount of impregnation of the sizing agent was small, the degree of sizing of the electromagnetic wave suppression paper was less than 3 seconds, and the water permeability was poorly evaluated. In Comparative Example 4, the amount of impregnation with the flame retardant was small, and flame retardancy was not obtained. Since the comparative example 5 did not use a guanidine flame retardant as a flame retardant, rust was generated. Since the comparative example 6 did not contain carbon fiber, the electromagnetic wave suppression effect was not acquired. In Comparative Example 7, the carbon fiber content was insufficient and the electromagnetic wave suppression effect was insufficient.
Claims (5)
数１で求められる前記原紙への前記グアニジン系難燃剤と前記サイズ剤の合計の含浸率が１５％以上であり、かつ、前記サイズ剤の添加量が難燃剤１００質量部に対し０．１質量部以上であり、
前記グアニジン系難燃剤の含浸によってＵＬ規格においてＵＬ９４Ｖ‐０及び／又はＵＬ９４ＶＴＭ‐０とし、前記ＰＡＮ系炭素繊維の含有によって近傍界用電波吸収材料測定装置であるネットワークアナライザーで求めた８５℃、１０００時間加熱処理前後の周波数２．４５４３ＧＨｚでの電波吸収率［ｄＢ］及び回路への影響度［ｄＢ］を−６ｄＢ以下とし、かつ、前記含浸させたサイズ剤によって、ＪＩＳ Ｐ ８１２２：２００４「紙及び板紙‐サイズ度試験方法‐ステキヒト法」によるステキヒトサイズ度が３秒以上であることを特徴とする電磁波抑制紙。
（数１）難燃剤とサイズ剤の合計の含浸率（％）＝（原紙１ｍ ２ 当たりの含浸量（固形分換算）／含浸前原紙の坪量）×１００ JIS P 8122: 2004 “Paper and paperboard—Sizing test method—Steechhit containing wood pulp and PAN-based carbon fiber as main fibers and made in a single layer or multiple layers without internal or external sizing agent The stencil sizing degree according to the “method” is impregnated with a guanidine flame retardant and a sizing agent on a base paper having a sizing degree of 1 second or less
The total impregnation ratio of the guanidine-based flame retardant and the sizing agent to the base paper obtained by Equation 1 is 15% or more, and the addition amount of the sizing agent is 0.1 mass with respect to 100 parts by mass of the flame retardant. Or more
UL94V-0 and / or UL94VTM-0 in the UL standard by impregnation with the guanidine-based flame retardant, and 85 ° C, 1000 hours determined by a network analyzer that is a near-field radio wave absorption material measuring device by containing the PAN-based carbon fiber According to JIS P 8122: 2004 “paper and paperboard, the electromagnetic wave absorption rate [dB] at a frequency of 2.4543 GHz before and after the heat treatment and the influence degree [dB] on the circuit are −6 dB or less and the impregnated size agent. An electromagnetic wave suppression paper characterized in that the sizing degree is 3 seconds or more according to "-Sizing degree test method-Steicht method".
(Equation 1) Total impregnation ratio of flame retardant and sizing agent (%) = ( impregnation amount per 1 m 2 of base paper (solid content conversion) / basis weight of base paper before impregnation) × 100
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