TWI418682B - 難燃性被覆金屬之布料及使用其之掩蔽電磁波用墊片 - Google Patents

難燃性被覆金屬之布料及使用其之掩蔽電磁波用墊片 Download PDF

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TWI418682B
TWI418682B TW95113790A TW95113790A TWI418682B TW I418682 B TWI418682 B TW I418682B TW 95113790 A TW95113790 A TW 95113790A TW 95113790 A TW95113790 A TW 95113790A TW I418682 B TWI418682 B TW I418682B
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resin
flame
retardant
coated
flame retardant
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TW200700607A (en
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Sachiyo Sakagawa
Toru Takegawa
Terufumi Iwaki
Katsuo Sasa
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Seiren Co Ltd
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Description

難燃性被覆金屬之布料及使用其之掩蔽電磁波用墊片
本發明係有關難燃性被覆金屬之布料及使用其之掩蔽電磁波用墊片。
伴隨公司，家庭急速普及以各種資訊終端機為主之電子機器，藉由此電子機器產生之靜電、電磁波，導致對於其他電器、人體產生不良影響。為防止此等靜電、電磁波之傷害，被期待一種具有良好電磁波掩蔽性與柔軟性之掩蔽電磁波墊片。更強烈期待一種實施製造物責任法(PL法)等，滿足UL規格等之具高度難燃性之掩蔽電磁波墊片。
做為掩蔽電磁波墊片之一例者有蕊材中使用柔軟之發泡材料，於此黏著捲繞具有導電性之布料。通常，為製造柔軟掩蔽電磁波墊片時，不僅蕊材，捲繞於蕊材之導電性布料亦必須充份柔軟。又，為實現做為掩蔽電磁波墊片之高度難燃性，被要求蕊材、導電性布料、黏接兩者之黏著劑等所有構成物具充份之難燃性。為此，做為難燃性者，使用鹵素系化合物、銻化合物、磷系化合物等，為具有高度難燃性，併用此等難燃劑，求取相乘效果者亦提出極多方案。另外，做為最近顧慮環境之用品者，亦進行開發一種未使用鹵素系化合物、銻化合物之具難燃性導電性布料。
專利文獻1中，提供一種於導電性布料表面層合添加鹵素系化合物、銻化合物以外之難燃劑的熱熔融樹脂，考量環境的墊片，惟，墊片之難燃性雖滿足UL規格94之V－1，卻無法滿足更高度難燃性之V－0。
又，專利文獻2中，揭示有薄膜狀支撐體單面上經由導電性薄膜，更層合導電難燃性黏著劑層所成之3層結構之難燃性電磁波掩蔽材料。做為難燃劑者使用非鹵素系之磷系難燃劑，為於黏著劑層賦予導電性之目的下，添加導電性粉末。此難燃劑掩蔽電磁波材料雖有助於對於環境之考量，惟，薄膜支撐體之導電性卻不足。又，對於單向捲繞之具柔軟性者，其對於立體變形之柔軟性亦不足，因此，不適合做為掩蔽電磁波墊片。
另外，使鹵素化合物、銻化合物以外之難燃劑添加於汎用之合成樹脂中，層合於導電性布料之表面，公知者更有使熱熔融樹脂薄片藉由層合板等進行層合做成墊片，惟，由於層合數太多損及布料之柔軟性，同時加工工程數亦多極不理想。
〔專利文獻1〕特開2003－243873號公報〔專利文獻2〕特開2003－258480號公報
本發明鑑於現狀不良，而以提供一種具有良好的掩蔽電磁波性能，具充份柔軟性之外，顧慮環境下不含鹵素系化合物、銻化合物，具有高度難燃性，更具有不引起金屬被膜變色、腐蝕之特性，用於電子機器所產生電磁波之掩蔽、靜電之對策等做為掩蔽電磁波墊片部材之理想的難燃性被覆金屬之布料及使用其之掩蔽電磁波用墊片為其目的。
本發明者為解決上述課題，進行精密研討後結果發現，於被覆金屬之布料至少其中一面上形成以特定比率配合鹵素系化合物、銻化合物以外之難燃劑與難燃助劑以及發泡劑及磷酸酯與熱塑性樹脂之混合物所成難燃性被膜後，可取得兼具高度難燃性與柔軟性，且不引起金屬被膜變色、腐蝕，亦不影響環境之難燃性被覆金屬之布料，進而完成本發明。
亦即，本發明第1於被覆金屬布料之至少其中1面形成由選自聚磷酸銨及聚磷酸蜜胺之難燃劑(A)、選自蜜胺、蜜胺三聚氰酸酯及三(2－羥乙基)異氰酸酯之難燃助劑(B)、選自熱膨脹性石墨、偶氮二羧醯胺及N,N’－二亞硝基戊甲撐四胺之發泡劑(C)、磷酸酯(D)以及熔融點為70~130℃之熱塑性樹脂(E)之混合物(F)所成之難燃性被膜的難燃性被覆金屬布料，其(A)：(B)：(C)：(D)：(E)之比率以重量比計為15~100：50~100：30~60：15~50：100為其特徵之難燃性被覆金屬之布料。
本發明第2係使具難燃性之合成樹脂發泡體所成蕊材外側以該難燃性被覆金屬之布料進行捲繞所成之掩蔽電磁波墊片。
本發明可提供一種具良好的掩蔽電磁波性能，兼具高度難燃性與柔軟性之難燃性被覆金屬之布料。本發明難燃性被覆金屬之布料未含有害人體之銻化合物，燃燒時亦不會產生二氧陸圜類等有毒鹵素氣體。使用本發明難燃性被覆金屬之布料後，製造掩蔽電磁波墊片時，無需另外使用黏著劑，因此，可取得製造步驟少，具良好柔軟性之掩蔽電磁波墊片。本發明難燃性被覆金屬之布料更可抑制難燃劑之滲出，不會引起金屬被膜之變色、腐蝕，可長期保持良好的掩蔽電磁波性能。
 〔發明實施之最佳形態〕
以下，針對本發明進行詳細說明。
做為本發明所使用的布料者可為織物、編物、不織布等形態，未特別限定。又，做為所使用之纖維基材者如：聚酯系(聚對苯二甲酸乙二醇酯、聚對苯二甲酸丁二醇酯等)、聚醯胺系(尼龍6、尼龍66等)、聚烯烴系(聚乙烯、聚丙烯等)、聚丙烯腈系、聚乙烯醇系、聚胺基甲酸乙酯系等之合成纖維、纖維素系(二乙酸酯、三乙酸酯等)、蛋白質系(promix等)等半合成纖維、纖維素系(人造絲、庫普拉等)、蛋白質系(酪蛋白纖維等)等再生纖維、纖維素系(木棉、麻等)、蛋白質系(羊毛、絹等)等天然纖維劑，此等亦可組合2種以上。其中，考量加工性及耐久性又以合成纖維較佳、聚酯系纖維為更佳。另外，由安全性面觀之，又以選擇未含鹵素化合物、銻化合物、紅磷之纖維者宜。
以金屬被覆由該纖維所成之布料纖維表面時可藉由先行技術公知方法之蒸鍍法、濺射法、電鍍法、無電解鍍敷法等進行之。其中考量所形成金屬被膜之均勻性、及生產性，又以無電解鍍敷法、或無電解鍍敷法與電鍍法之併用為較佳。另外，為使確實固定金屬可預先使附著於纖維表面之糊劑、油劑、灰塵等不純物藉由精密處理後完全去除者宜。精密處理可採用先行技術公知之方法，並未特別限定。
做為所使用之金屬例如：金、銀、銅、鋅、鎳，及此等合金等例，而考量導電性及製造成本面，又以銅、鎳為較佳。此等金屬所形成之被膜以單層或雙層者宜。若達3層以上金屬被膜太厚，布料觸感變硬，製造成本亦變高而不理想。金屬被膜呈雙層層合時，可層合雙層同種金屬，亦可層合雙層不同金屬。此可考量所期待掩蔽電磁波性能、耐久性進行適當設定。
本發明難燃性被覆金屬之布料係於該被覆金屬布料之至少其中1面形成以特定比率配合難燃劑(A)與難燃助劑(B)及發泡劑(C)與磷酸酯(D)以及熱塑性樹脂(E)之混合物(F)所成難燃性被膜之構成者。
本發明所使用之難燃劑(A)可為可做為難燃劑使用之先行技術公知之化合物，惟，不含鹵素系化合物、銻化合物。做為此難燃劑者可選自聚磷酸銨及聚磷酸蜜胺。此等可單獨使用亦可合併使用。難燃劑(A)之配合量對於熱塑性樹脂(E)100重量份以15~100重量份者宜，更佳者為40~90重量份。當難燃劑(A)之配合量對於熱塑性樹脂(E)100重量份未達15重量份時，將無法有效賦予難燃性於難燃性被覆金屬之布料，反之，超出100重量份則出現難燃性被覆金屬布料之觸感變粗硬等。
本發明所使用之難燃助劑(B)具有抑制熱分解之吸熱、與不活性氣體之氧、及可燃性氣體之稀釋後燃燒時之延燒的功能，如：選自蜜胺、蜜胺三聚氰酸酯及三(2－羥乙基)異氰酸酯例。此等可單獨使用，亦可併用2種以上。難燃助劑(B)之配合量對於熱塑性樹脂(E)100重量份時，以50~100重量份者宜、更佳者為60~90重量份。當難燃助劑(B)之配合量對於熱塑性脂(E)100重量份時，未達50重量份則於難燃性被覆金屬布料將未能賦予所期待之難燃性能，反之，超出100重量份則難燃性被覆金屬布料之觸感將變粗硬等不理想情況產生。
本發明所使用之發泡劑(C)具有抑制發泡斷熱層之形成與不活性氣體之氧、可燃性氣體稀釋後燃燒時之延燒之功能，如：選自熱膨脹性石墨、偶氮二羧基醯胺及N,N’－二亞硝基戊甲撐四胺。此等可單獨使用，亦可併用2種以上。發泡劑(C)之配合量對於熱塑性樹脂(E)100重量份時，以30~60重量份者宜、更佳者為33~50重量份。當發泡劑(C)之配合量對於熱塑性樹脂(E)100重量份未達30重量份時，則於難燃性被覆金屬布料將未能賦予所期待之難燃性能，反之，超出60重量份則難燃性被覆金屬布料之觸感將變粗硬等不理想情況產生。
本發明之磷酸酯(D)主要具可塑化由混合物(F)所成之難燃性被膜的功能，而未含鹵素者。磷酸酯(D)其含磷量以6~11重量%者宜。更佳者為含有8~10重量%。當磷酸酯(D)之含磷量未達6重量%時，將有降低難燃性被膜之難燃性能之虞，反之，超出11重量%則降低可塑化效果，使難燃性被膜無法充份可塑化等不理想情況產生。
做為磷酸酯(D)之具體例者如：三甲基磷鹽、三乙基磷鹽、三丁基磷鹽、三－2－乙基己基磷鹽、三苯基磷鹽、磷酸三甲苯酚酯、三二甲苯基磷鹽、甲苯酚二苯基磷鹽、二甲苯基二苯基磷鹽、間苯二酚雙(二苯基磷鹽)、雙酚A雙(二苯磷鹽)等、先行技術公知之化合物例、此等可單獨使用，亦可合併2種以上使用之。當磷酸酯(D)之配合量對於熱塑性樹脂(E)100質量份未達15重量份時，則其可塑性效果將不足有柔軟性不良之虞，反之，超出50重量份則導致磷酸酯滲出，形成混合物(F)所成難燃性被膜時，被膜出現黏膩等不適情況產生。
本發明所使用之熱塑性樹脂(E)具有使上述難燃劑(A)、難燃助劑(B)、發泡劑(C)、磷酸酯(D)固定於被覆金屬布料之功能，可做為黏合劑樹脂之使用。本發明難燃性被覆金屬布料使用後，製造掩蔽電磁波墊片時，於蕊材之發泡體等更具有黏著該難燃性被覆金屬布料之熱熔融樹脂之功能。此目的所使用之熱塑性樹脂(E)之具體例如：胺基甲酸乙酯樹脂、丙烯酸樹脂、聚酯樹脂等例。此等可單獨使用，亦可併用2種以上。其中考量其柔軟性，又以胺基甲酸乙酯樹脂、丙烯酸樹脂為較佳，更佳者為胺基甲酸乙酯樹脂。由於胺基甲酸乙酯樹脂較不易阻撓難燃性、且觸感柔軟，因此，特別適用於本發明。又，熱塑性樹脂(E)其熔融點以70~130℃者宜、更佳者為80~120℃。當熱塑性樹脂(E)之熔融點未達70℃時，則於塗佈製造時乾燥後將無法捲繞，於捆包運送時恐使塗佈樹脂轉移至捲繞背面。且，做為墊片使用時，可預料的於高溫環境下將出現剝離等困擾。反之，熔融點超出130℃時，則製造墊片時，易導致與蕊材之胺基甲酸乙酯泡沫塑料黏著不良，而無法取得優質墊片。又，製造機之設定溫度亦務必為更高溫之條件，因此，對於製造機之負荷加大等不理想情況產生。
混合物(F)中，為賦予著色、觸感之調節、絕緣性等機能性之目的下，在不阻撓其功能範圍下，可配合其他添加劑。做為此添加劑之具體例如：聚矽氧橡膠、烯烴系共聚物、改性丁腈橡膠、改性聚丁二烯橡膠等彈性體、聚乙烯等熱塑性樹脂、顏料等例。
本發明所使用之難燃劑(A)、難燃助劑(B)、發泡劑(C)、磷酸酯(D)、熱塑性樹脂(E)及添加劑等原料可使市售者，未特別限定。如熱塑性樹脂(E)一般以溶於有機溶劑之狀態市售之，極易取得。
本發明難燃性被覆金屬布料係以以上所說明之難燃劑(A)、難燃助劑(B)、發泡劑(C)、磷酸酯(D)及熱塑性樹脂(E)、為必須成份者、將含特定比率之混合物(F)塗佈於被覆金屬布料後，形成混合物(F)所成難燃性被膜後可製造之。
做為溶解或分散各種原料之溶媒例者如：苯、甲苯、二甲苯、丁酮、二甲基甲醯胺等有機溶劑例者。另外，亦可使用工業用石油、石腦油、松節油等鑛物油餾份。此等可單獨使用，亦可併用2種以上。
通常，溶媒其混合處理液之黏度適度添加為3000~25000 cps、更佳者為8000~20000 cps。當混合處理液之黏度末達3000 cps時，則將恐於被覆金屬布料之背面滲出混合處理液而影響外觀，反之，超出25000 cps則塗佈性將變差。
另外，被塗金屬布料中為防止滲出之目的下，亦可預先以丙烯酸樹脂、聚胺基甲酸乙酯、聚酯樹脂等進行填孔塗佈。該填孔塗佈之進行可將混合處理液塗佈於與塗佈面同面、或反面均無妨。另外，亦可以著色之目的添加顏料於填孔樹脂中，更可為提昇難燃性之目的下添加難燃劑。此時當然一起選擇鹵素系化合物、銻化合物以外之難燃劑。
混合處理液之調製只要可均勻分散混合各種原料即可，可使用任意方法進行之。一般方法例如：藉由螺旋攪拌之分散混合，藉由揑合器、滾輥等混煉之分散混合劑。
又，做為塗層法例者，可採用刮刀塗佈機、滾輥塗層機、縱剪塗層機等一般方法。另外，亦可為層合方式、連接方式。將混合處理液塗層於被覆金屬布料後，藉由乾燥等去除溶劑，形成混合物(F)所成之難燃性被膜。
對於被覆金屬布料之賦予混合處理液量其做成混合物(F)所成難燃性被膜之重量者以100~300重量%者宜、特別以150~250重量%為更佳。當賦予量未達100重量%時，將無法取得高度難燃性。反之，超出300重量%則不僅失去原本布料之柔軟性、更無法期待難燃性更一步之提昇。
如此，可取得本發明難燃性被覆金屬之布料。混合物(F)所成之難燃性被膜不僅形成於布料之單面，亦可於雙面形成之。又，形成難燃性被膜後，可賦予其他機能性之加工，或進行壓延加工等特殊加工。
又，使用本發明難燃性被覆金屬布料，作成掩蔽電磁波用墊片時，做為蕊材者可使用柔軟、壓縮復原性佳、具三惟結構之發泡體。做為此等發泡體例者可使用聚矽氧樹脂、蜜胺樹脂等難燃性為其特之合成樹脂所成之發泡體、聚乙烯樹脂、聚丙烯樹脂、聚胺基甲酸乙酯樹脂、聚酯樹脂、聚醯亞胺樹脂、聚丁二烯樹脂等添加難燃劑等後，賦予發泡體等。此等中又以使添加難燃劑之聚胺基甲酸乙酯樹脂進行發泡之發泡體較具柔軟性、壓縮復性較佳、步驟數亦少、經濟面亦佳、為較理想者。又，所使用之難燃劑只要是鹵素系化合物、銻化合物、紅磷以外之難燃劑均可、無特別限定。
〔實施例〕
以下，以實施例為例，進行本發明更詳細之說明，本發明未受限於以下實施例。實施例中之「份」及「%」代表重量基準。又，所得難燃性被覆金屬布料之性能係藉由以下方法進行評定。
(1)難燃性將所得難燃性被覆金屬布料捲繞於難燃性蕊材，作成黏著取得掩蔽電磁波墊片，供於試驗。使用股份公司Inoaccor polation製之胺基甲酸乙酯發泡材F－200G，做為難燃性蕊材，將此切成厚度3mm、13mm×125mm，將所得難燃性被覆金屬布料切成33mm×125mm，連接難燃性被膜於該胺基甲酸乙酯發泡材F－200G進行捲繞，以180℃之熨斗進行黏著後，作成掩蔽電磁波用墊片。當然，此胺基甲酸乙酯發泡材F－200G未含鹵素化合物、銻化合物。針對此掩蔽電磁波用墊片依UL 94 V－0試驗法進行評定難燃性。
(2)熱熔融黏著性準備2片切成縱100mm×橫25mm之難燃性被覆金屬布料，將其中1片難燃性被膜面與另一片金屬被膜面重疊，以180℃之熨斗按壓2秒鐘使黏著。之後，於室內放置30分鐘，將重疊部份剝離後，測定黏著強度。測定器使用股份公司olyentec製之天使龍萬能試驗機STA－1225。
(3)柔軟性依JIS L 1096 A法(45° kanchileva法)測定難燃性被覆金屬之布料的軟硬性。其中，數值愈小代表觸感愈柔軟。
(4)環境耐久性將特比．埃斯波克製恒溫恒濕器PR 3KPH設定於60℃、90%、投入難燃性被覆金屬布料放置100小時。之後進行以下(4－1)(4－2)(4－3)之評定。
(4－1)表面導通性利用三菱化學(股份)製之Loresta－EP MCP－T 360 ESP型之電阻值測定器，測定難燃性被覆金屬布料之金屬被膜表面(未形成難燃性被膜之面)的電阻值。
(4－2)電磁波掩蔽性依關西電子工業振興中心之KEC法為基準，利用日本體斯特帕卡德(股份)製之附追踪振盪器之光譜分析器HP8591EM進行測定10MHz~1GHz之電磁波的衰減。
(4－3)金屬被膜之變色，腐蝕性試驗進行觀察比較投入金屬被膜表面100小時以前與100小時之後之金屬被膜表面的變色、腐蝕。
〔實施例1〕
(被覆金屬織物之調製)將聚酯系纖維織物(經絲56dtex/36f、緯絲56dtex/36f)進行精煉、乾燥、熱處理後，浸漬於含0.3g/L氯化鈀、30g/L氯化亞錫、300ml/L之36%鹽酸之40℃水溶液中2分鐘後水洗之。再浸漬於含7.5g/L之硫酸銅、30ml/L之37%甲醛水、85g/L之羅謝爾鹽之30℃無電解鍍銅液中5分鐘後水洗之。更，於含300g/L之胺基磺酸鎳、30g/L之硼酸、15g/L之氯化鎳之pH 3.7、35℃電氣鍍鎳液中10分鐘，電流密度5A/dm2 下浸漬後層合鎳之後進行水洗。織物中鍍銅10g/m2 、鍍鎳4g/m2 。所得被覆金屬織物之外觀為64g/m2 。
於所得之被覆金屬織物之單面利用刮刀進行塗佈下述處方1之填孔樹脂，於130℃下進行乾燥1分鐘。賦予量為4g/m2 固形成份。再於同一面以刮刀塗佈下述處方2之混合處理液，於130℃下進行乾燥2分鐘。賦予量為130g/m2 固形成份。
(處方1)
toacron SA－6218 100份((股份)toupe製、丙烯酸樹脂、固形成分18%)Lezamin UD交聯劑 1.5份(大日精化工業(股份)製、異氰酸酯交聯劑、固形成分75%)甲苯 適量
調整甲苯添加量後，進行調整黏度為15000 cps。
(處方2)
聚磷酸銨 22份(73.3)蜜胺 25份(83.3)熱膨脹性石墨 11份(36.7)磷酸三甲苯酚酯 10份(33.3)酯系胺基甲酸乙酯樹脂(溶融點90℃) 30份(100)二甲基甲醯胺 43份丁酮 適量
調整丁酮添加量後，進行調整黏度為8000 cps。
〔實施例2〕
於相同於實施例1鍍敷取得之被覆金屬織物單面以刮刀塗佈下述處方3之填孔樹脂，於130℃下進行乾燥1分鐘。賦予量為6g/m2 之固形成份。再於同一面以刮刀塗佈下述處方4之混合處理液，於130℃下進行乾燥2分鐘。賦予量為130g/m2 之固形成份。
(處方3)
toacron SA－6218 100份((股份)toupe製、丙烯酸樹脂、固形成分18%)Lezamin UD交聯劑 1.5份(大日精化工業(股份)製、異氰酸酯交聯劑、固形成分75%)環狀苯氧基磷肌酸 8.5份磷酸三甲苯酚酯 2.5份甲苯 適量
調整甲苯添加量後，調整黏度為18000 cps。
(處方4)
聚磷酸銨 25份(83.3)蜜胺三聚氰酸酯 25份(83.3)熱膨脹性石墨 11份(36.7)雙酚A雙(二苯磷鹽) 12份(40)酯系胺基甲酸乙酯樹脂(溶融點90℃) 30份(100)二甲基甲醯胺 43份丁酮 適量
調整丁酮添加量後，調整黏度為8000 cps。
〔比較例1〕
於相同於實施例1鍍敷取得之被覆金屬織物單面以刮刀塗佈處方1之填孔樹脂，於130℃下乾燥1分鐘。賦予量為4g/m2 之固形成份。再於同一面以刮刀塗佈下述處方5之混合處理液，於130℃下乾燥2分鐘。賦予量為130g/m2 固形成份。
(處方5)
聚磷酸銨 50份(166.7)蜜胺三聚氰酸酯 5份(16.7)熱膨脹性石墨 2份(6.7)雙酚A雙(二苯磷鹽) 2份(6.7)酯系胺基甲酸乙酯樹脂(溶融點90℃) 30份(100)二甲基甲醯胺 43份
調整二甲基甲醯胺之添加量，調整黏度為8000 cps。
〔比較例2〕
於相同於實施例1鍍敷取得之被覆金屬織物之單面以刮刀塗佈處方1之填孔樹脂，於130℃下乾燥1分鐘。賦予量為5g/m2 固形成份。再於同一面以刮刀塗佈下述處方6之混合處理液，於130℃下乾燥2分鐘。賦予量為130g/m2 固形成份。
(處方6)
膦酸酯 25份(83.3)蜜胺三聚氰酸酯 20份(66.7)熱膨脹性石墨 18份(60)雙酚A雙(二苯磷鹽) 15份(50)酯系胺基甲酸乙酯樹脂(溶融點90℃) 30份(100)二甲基甲醯胺 43份
調整二甲基甲醯胺之添加量後，調整黏度為8000 cps。
環式磷酸酯中使用(5－乙基－2－甲基－1,3,2－二噁基噻己環烷(phosphorinane)－5－基)甲基二甲基磷酸酯－p－氧化物與雙〔(5－乙基－2－甲基－1,3,2－二噁基噻己環烷基)甲基〕甲基磷酸酯－p,p’－二氧化物之重量比為8：2之混合物。
〔比較例3〕
於相同於實施例1鍍敷取得被覆金屬織物之單面上以刮刀塗佈處方1之填孔樹脂，於130℃下乾燥1分鐘。賦予量為固形成份4g/m2 。再於同一面以刮刀塗佈下述處方7之混合處理液，於130℃下乾燥2分鐘。賦予量為固形成份130g/m2 。更於同一面上進行酯系熱熔融胺基甲酸乙酯薄片之層合處理後，設置黏著層。
(處方7)
聚磷酸銻 30份(100)蜜胺三聚氰酸酯 24份(80)熱膨脹性石墨 11份(36.7)雙酚A雙(二苯磷鹽) 15份(50)酯系胺基甲酸乙酯樹脂(溶融點150℃) 30份(100)二甲基甲醯胺 43份
調整二甲基甲醯胺之添加量後，調整黏度為8000 cps。
〔比較例4〕
於相同於實施例1鍍敷取得被覆金屬織物單面以刮刀塗佈處方1之填孔樹脂，於130℃下乾燥1分鐘。賦予量為固形份4g/m2 。再於同一面以刮刀塗佈下述處方8之混合處理液，於130℃下乾燥2分鐘。賦予量為固形份130g/m2 。
(處方8)
非醚溴化合物 47份(156.7)三氧化銻 24份(80)雙酚A雙(二苯磷鹽) 14份(46.7)酯系胺基甲酸乙酯樹脂(溶融點90℃) 30份(100)二甲基甲醯胺 26份
調整二甲基甲醯胺之添加量後，調整黏度為8000 cps。
有關上述實施例及比較例，其評定結果示於表1。
實施例1及實施例2中未含鹵素系化合物、銻化合物，具有UL 94之V－0高度難燃性，具良好的柔軟性、電磁波掩蔽性，同時，可取得抑制金屬被膜變色、腐蝕之難燃性被覆金屬布料。而，比較例1其各成份配合比率不適當，導致未能達到充份之難燃性。又，比較例2於難燃劑(A)中使用環式膦酸酯為聚磷酸銨及/或聚磷酸蜜胺以外之磷系難燃劑，其難燃性雖可滿足所期待之性能，卻出現金屬被膜之變色、腐蝕情況，不耐實用者。比較例3因其樹脂層合數多，而觸感變硬，無法期待墊片之柔軟性，工程數亦增加，不利經濟面。比較例4雖滿足所有評定項目，惟，因使用鹵素化合物與銻化合物而有影響環境之虞。

Claims (7)

  1. 一種難燃性被覆金屬之布料，其特徵係於被覆金屬布料之至少單面上形成由選自聚磷酸銨及聚磷酸蜜胺之難燃劑(A)；選自蜜胺、蜜胺三聚氰酸酯及三(2-羥乙基)異氰酸酯之難燃助劑(B)；選自熱膨脹性石墨、偶氮二羧基醯胺、N,N’-二亞硝基戊甲撐四胺之發泡劑(C)；磷酸酯(D)以及熔點70~130℃之熱塑性樹脂(E)之混合物(F)所成之被覆溶液所被覆之難燃性被膜的被覆金屬布料，其中，前述磷酸酯(D)之含磷量為6~11重量%，且未含鹵素，前述熱塑性樹脂(E)係選自胺基甲酸乙酯樹脂、丙烯酸樹脂及聚酯樹脂，其(A)：(B)：(C)：(D)：(E)之比率以重量比計為15~100：50~100：30~60：15~50：100。
  2. 如申請專利範圍第1項之難燃性被覆金屬之布料，其中磷酸酯(D)係選自三甲基磷鹽、三乙基磷鹽、三丁基磷鹽、三-2-乙基己基磷鹽、三苯基磷鹽、磷酸三甲苯酚酯、三二甲苯基磷鹽、甲苯酚二苯基磷鹽、二甲苯基二苯基磷鹽、間苯二酚雙(二苯基磷鹽)、雙酚A雙(二苯磷鹽)。
  3. 如申請專利範圍第1項或第2項之難燃性被覆金屬之布料，其中由混合物(F)所成之難燃性被膜的重量對於被覆金屬之布料為100~300重量%。
  4. 一種掩蔽電磁波用墊片，其特徵係使由選自聚矽氧樹脂、蜜胺樹脂、聚乙烯樹脂、聚丙烯樹脂、聚胺基甲酸乙酯樹脂、聚酯樹脂、聚醯亞胺樹脂、及聚丁二烯樹脂之樹脂的發泡體所成蕊材之外側以如申請專利範圍第1項或第2項之難燃性被覆金屬布料捲繞所成。
  5. 一種掩蔽電磁波用墊片，其特徵係使由選自聚矽氧樹脂或胺樹脂之樹脂的發泡體所成蕊材之外側以如申請專利範圍第1項或第2項之難燃性被覆金屬布料捲繞所成。
  6. 一種掩蔽電磁波用墊片，其特徵係使由選自聚乙烯樹脂、聚丙烯樹脂、聚胺基甲酸乙酯樹脂、聚酯樹脂、聚醯亞胺樹脂、及聚丁二烯樹脂之樹脂中添加難燃劑後經發泡的發泡體所成蕊材之外側以如申請專利範圍第1項或第2項之難燃性被覆金屬布料捲繞所成。
  7. 如申請專利範圍第6項之掩蔽電磁波用墊片，其中，前述發泡體進一步經難燃劑含浸、被覆、噴灑之蕊材。
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