CN101208469A - 阻燃性金属覆盖布及用其形成的电磁波屏蔽用衬垫 - Google Patents

阻燃性金属覆盖布及用其形成的电磁波屏蔽用衬垫 Download PDF

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CN101208469A
CN101208469A CNA2006800127171A CN200680012717A CN101208469A CN 101208469 A CN101208469 A CN 101208469A CN A2006800127171 A CNA2006800127171 A CN A2006800127171A CN 200680012717 A CN200680012717 A CN 200680012717A CN 101208469 A CN101208469 A CN 101208469A
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flame
retardant
metal
flammability
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CN101208469B (zh
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坂川幸代
竹川彻
岩城辉文
佐佐克夫
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Seiren Co Ltd
Daikyo Chemical Co Ltd
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Abstract

本发明提供一种本来就具有优异的电磁波屏蔽性,不含卤素类化合物及锑化合物,具有高阻燃性,柔软且即使长期使用也不会出现金属被膜劣化的阻燃性金属覆盖布。该阻燃性金属覆盖布的特征在于是通过在金属覆盖布的至少一个面上形成阻燃性被膜而得到的,所述阻燃性被膜是由选自多磷酸铵等的阻燃剂(A)、选自三聚氰胺等的阻燃助剂(B)、选自热膨胀性石墨等的发泡剂(C)、磷酸酯(D)及熔点为70~130℃的热塑性树脂(E)的混合物(F)构成,并且(A)∶(B)∶(C)∶(D)∶(E)的比例以重量比计被设定在特定的范围内。

Description

阻燃性金属覆盖布及用其形成的电磁波屏蔽用衬垫
技术领域
本发明涉及阻燃性金属覆盖布及用其形成的电磁波屏蔽用衬垫。
背景技术
伴随着以各种信息终端为主的电子设备在办公室及家庭中的迅速普及,这些电子设备产生的静电及电磁波可能会对其它电子设备及人体产生影响。为了防止这些静电及电磁波造成的危害,需要具有优异的电磁波屏蔽性和柔软性的电磁波屏蔽衬垫。而且,由于制造物责任法(PL法)等的施行,极其需要满足UL标准等、具有高阻燃性的电磁波屏蔽衬垫。
作为电磁波屏蔽衬垫的一个例子,存在有使用柔软的发泡材料作为芯材、在其上卷绕和粘接具有导电性的布料而形成的衬垫。通常,为了制备柔软的电磁波屏蔽衬垫,不仅是芯材,卷绕芯材的导电性布料也需要足够柔软。另外,作为电磁波屏蔽衬垫,为了实现高阻燃性,芯材、导电性布料、粘接两者的胶粘剂等所有构成物者需要有足够的阻燃性。因此,一直使用卤素类化合物、锑化合物、磷类化合物等作为阻燃剂。为了保持高阻燃性,还提出了将这些阻燃剂并用,从而达到协同作用的大量方案。另一方面,作为最近的考虑了环保问题的制品,正在开发在不使用卤素类化合物及锑化合物的、具有阻燃性的导电性布料。
日本特开2003-243873号公报中提供了在导电性布料的表面上层叠有添加了除卤素类化合物及锑化合物以外的阻燃剂的热熔性树脂的、考虑了环保问题的衬垫,衬垫的阻燃性尽管满足UL标准94的V-1,却并不满足作为更高阻燃性的V-0。
另外,日本特开2003-258480号公报中公开了在薄膜状支撑体的单面上存在有导电性薄膜,并再层叠导电阻燃性胶粘剂层而形成的具有3层结构的阻燃性电磁波屏蔽材料。其中使用非卤素类的磷类阻燃剂作为阻燃剂,为了在胶粘剂层中赋予导电性,添加有导电性粉末。尽管这种阻燃性电磁波屏蔽材料不存在环保问题,但薄膜支撑体缺乏导电性。另外,虽然具有仅对一个方向弯曲的柔软性,但对于立体变形的柔软性不足,因此,不适合用作电磁波屏蔽衬垫。
另外,已知有:在通用合成树脂中添加除卤素化合物及锑化合物以外的阻燃剂并层叠在导电性布料表面上,再层压热熔性树脂片等而形成的层叠体作为衬垫,但此时的层叠数多,因而破坏了布料的柔软性,而且还存在加工工序数增多的缺点。
发明内容
本发明的目的在于解决上述以往技术的问题,特别是提供一种阻燃性金属覆盖布及用其形成的电磁波屏蔽用衬垫,所述阻燃性金属覆盖布不但具有优异的电磁波屏蔽性能、足够的柔软性,而且考虑了环保问题而不含卤素类化合物及锑化合物,具有高阻燃性,并且具有金属被膜不发生变色及腐蚀的特性,适合作为用于电子设备产生的电磁波的屏蔽及防备静电的电磁波屏蔽衬垫材料。
为了达到上述目的,本发明人等反复进行了深入研究,结果发现将除卤素类化合物及锑化合物以外的阻燃剂、阻燃助剂、发泡剂、磷酸酯和热塑性树脂按照特定比例进行配合,得到混合物,在金属覆盖布料的至少一个面上形成由该混合物构成的阻燃性被膜,由此可以得到同时具备高阻燃性及柔软性、金属被膜不产生变色及腐蚀、还考虑了环保性的阻燃性金属覆盖布,从而完成了本发明。
也就是说,第一,本发明涉及一种阻燃性金属覆盖布,其特征在于是通过在金属覆盖布的至少一个面上形成有阻燃性被膜而形成的,所述阻燃性被膜是由选自多磷酸铵及多磷酸三聚氰胺的阻燃剂(A)、选自三聚氰胺、氰尿酸三聚氰胺及三(2-羟乙基)异氰酸酯的阻燃助剂(B)、选自热膨胀性石墨、偶氮甲酰胺及N,N’-二亚硝基五亚甲基四胺的发泡剂(C)、磷酸酯(D)及熔点为70~130℃的热塑性树脂(E)的混合物(F)构成,并且(A)∶(B)∶(C)∶(D)∶(E)的比例以重量比计为15~100∶50~100∶30~60∶15~50∶100。
第二,本发明涉及将上述阻燃性金属覆盖布卷绕于由具备阻燃性的合成树脂发泡体构成的芯材外侧而形成的电磁波屏蔽衬垫。
根据本发明,可以提供不仅具有优异的电磁波屏蔽性,并且同时具备高度的阻燃性和柔软性的阻燃性金属覆盖布。本发明的阻燃性金属覆盖布不含有对人体有害的锑化合物,燃烧时也不产生二英类等有毒的卤素气体。使用本发明的阻燃性金属覆盖布制造电磁波屏蔽衬垫时,不需要另外使用胶粘剂,因此可以通过较少的制造工序得到柔软性优异的电磁波屏蔽衬垫。而且,本发明的阻燃性金属覆盖布可抑制阻燃剂的渗出,金属被膜不产生变色及腐蚀,因此可以长期保持优异的电磁波屏蔽性。
具体实施方式
以下对本发明进行详细说明。
作为本发明中使用的布料,可以列举纺织物、编织物、无纺布等布,没有特别限制。另外,作为使用的纤维材料,可以列举聚酯类(聚对苯二甲酸乙二酯、聚对苯二甲酸丁二酯等)、聚酰胺类(尼龙6、尼龙66等)、聚烯烃类(聚乙烯、聚丙烯等)、聚丙烯腈类、聚乙烯醇类、聚氨酯类等合成纤维;纤维素类(二醋酸、三醋酸纤维等)、蛋白质类(普罗米克斯等)等半合成纤维;纤维素类(人造丝、铜氨丝等)、蛋白质类(酪蛋白纤维等)等再生纤维;纤维素类(棉、麻等)、蛋白质类(羊毛、丝绸等)等天然纤维,这些纤维也可以2种以上组合使用。其中,从加工性及耐久性考虑优选合成纤维,更优选聚酯类纤维。另外,从安全性方面考虑,优选从不含卤素化合物、锑化合物及红磷的纤维中进行选择。
用金属包覆由上述纤维构成的布料的纤维表面时,可以采用蒸镀法、溅射法、电镀法、无电解镀敷法等以往公知的方法。其中,如果从形成金属被膜的均匀性及生产性上考虑,则优选无电解镀敷法或无电解镀敷法与电镀法的并用。另外,为了确保金属的固着,优选预先通过精练处理完全除去纤维表面附着的糊剂、油剂、灰尘等杂质。精练处理可以采用公知的方法进行,没有特别限制。
作为使用的金属,可以列举金、银、铜、锌、镍及它们的合金,如果从导电性及制造成本上考虑,则优选铜、镍。由这些金属形成的被膜优选为1层或2层。如果达到3层以上,则金属被膜的厚度大,不仅布料的手感变硬,制造成本也变高等,因此是不可取的。将金属被膜进行2层层叠时,可以是对2层同种的金属进行层叠,也可以对不同的金属进行层叠。这些都可以根据所需要的电磁波屏蔽性或耐久性进行适当地设定。
本发明的阻燃性金属覆盖布是具有以下构成的材料,即,在上述金属覆盖布的至少一个面上,形成由混合物(F)构成的阻燃性被膜,所述混合物(F)是由阻燃剂(A)、阻燃助剂(B)、发泡剂(C)、磷酸酯(D)和热塑性树脂(E)按照特定比例进行配合而得到的。
本发明中使用的阻燃剂(A)可以是能够作为阻燃剂使用的以往公知的化合物,但是含有卤素类化合物、锑化合物的物质除外。作为这种阻燃剂,可以从多磷酸铵及多磷酸三聚氰胺中进行选择。这些阻燃剂可以单独使用,也可以组合使用。要求阻燃剂(A)的配合量相对于100重量份热塑性树脂(E)为15~100重量份,更优选为40~90重量份。如果阻燃剂(A)的配合量相对于100重量份热塑性树脂(E)不足15重量份,则不能赋予阻燃性金属覆盖布以足够的阻燃性,如果超过100重量份,则会出现阻燃性金属覆盖布的手感变得到粗硬等问题。
本发明中使用的阻燃助剂(B),具有通过基于热分解的吸热和利用惰性气体对氧气及可燃性气体进行的稀释来抑制燃烧时火势蔓延的功能,可以从三聚氰胺、氰尿酸三聚氰胺及三(2-羟乙基)异氰酸酯中选择。这些物质可以单独使用,也可以同时使用2种以上。要求阻燃助剂(B)的配合量相对于100重量份热塑性树脂(E)为50~100重量份,更优选为60~90重量份。如果阻燃助剂(B)的配合量相对于100重量份热塑性树脂(E)不足50重量份,则不能赋予阻燃性金属覆盖布以预期的阻燃性,如果超过100重量份,则会出现阻燃性金属覆盖布的手感变得到粗硬等问题。
本发明中使用的发泡剂(C),具有通过形成发泡绝热层和利用惰性气体对氧气及可燃性气体进行的稀释来抑制燃烧时火势蔓延的功能,可以从热膨胀性石墨、偶氮甲酰胺及N,N’-二亚硝基五亚甲基四胺中选择。这些物质可以单独使用,也可以2种以上同时使用。要求发泡剂(C)的配合量相对于100重量份热塑性树脂(E)为30~60重量份,更优选为33~50重量份。如果发泡剂(C)的配合量相对于100重量份热塑性树脂(E)不足30重量份,则不能赋予阻燃性金属覆盖布以预期的阻燃性,如果超过60重量份,则会出现阻燃性金属覆盖布的手感变得到粗硬等问题。
本发明中使用的磷酸酯(D)主要具有使由混合物(F)构成的阻燃性被膜塑化的功能,是不含卤素的物质。优选磷酸酯(D)的磷含量为6~11重量%。更优选磷含量为8~10重量%。如果磷酸酯(D)的磷含量不足6重量%,则可能引起阻燃性被膜的阻燃性能变差,如果超过11重量%,则可能产生塑化效果差,阻燃性被膜不能充分塑化等问题。
作为磷酸酯(D)的具体例子,可以列举磷酸三甲酯、磷酸三乙酯、磷酸三丁酯、磷酸三(2-乙基己)酯、磷酸三苯酯、磷酸三甲苯酯、磷酸三二甲苯酯、磷酸甲苯基二苯酯、磷酸二甲苯基二苯酯、间苯二酚双(磷酸二苯酯)、双酚A双(磷酸二苯酯)等以往公知的化合物,这些物质可以单独使用,也可以2种以上同时使用。要求磷酸酯(D)的配合量相对于100重量份热塑性树脂(E)为15~50重量份,更优选为30~40重量份。如果磷酸酯(D)的配合量相对于100重量份热塑性树脂(E)不足15重量份,则可能导致塑化作用不足,从而使柔软性不足,如果超过50重量份,则会出现磷酸酯渗出,或在形成由混合物(F)构成的阻燃性被膜时被膜发粘等问题。
本发明中使用的热塑性树脂(E)具有使上述阻燃剂(A)、阻燃助剂(B)、发泡剂(C)、磷酸酯(D)固着于金属覆盖布上的功能,是作为粘合剂树脂使用的。另外,使用本发明的阻燃性金属覆盖布制造电磁波屏蔽衬垫时,还具有热熔性树脂的功能,使得该阻燃性金属覆盖布粘接在形成芯材的发泡体等上。作为用于这种目的的热塑性树脂(E)的具体例子,可以列举聚氨酯树脂、丙烯酸树脂、聚酯树脂等。这些物质可以单独使用,也可以2种以上同时使用。其中,如果从柔软性上考虑,则优选聚氨酯树脂、丙烯酸树脂,更优选聚氨酯树脂。聚氨酯树脂不容易损害阻燃性,而且手感柔软,因此在本发明中是特别优选的。另外,热塑性树脂(E)的熔点为70~130℃,更优选熔点为80~120℃。如果热塑性树脂(E)的熔点不足70℃,则可能导致在涂布制造时,存在有不能在干燥后卷取或者在打包输送时将涂布树脂转移到卷取背面的问题。另外,作为衬垫使用时,可以预测到在高温环境下会从芯材剥离等问题。如果熔点超过130℃,则制造衬垫时容易引起作为芯材的聚氨酯泡沫的粘接不良,不能得到质量好的衬垫。另外,制造设备的设定温度也需要更高的温度条件,会出现制造设备负荷变大等问题。
为了赋予混合物(F)以着色、手感调节性、绝缘性等功能性,可以在不损害其性能的范围内配入其它添加剂。作为这种添加剂的具体例子,可以列举有机硅橡胶、烯烃类共聚物、改性丁腈橡胶、改性丁二烯橡胶等弹性体、聚乙烯等热塑性树脂、颜料等。
本发明中使用的阻燃剂(A)、阻燃助剂(B)、发泡剂(C)、磷酸酯(D)、热塑性树脂(E)及添加剂等原料可以不特别局限于市售物质地进行使用。例如,热塑性树脂(E)有以溶解于有机溶剂中的状态进行市售的,容易获得。
本发明的阻燃性金属覆盖布可以通过以下方式制造,即,用以上面说明的阻燃剂(A)、阻燃助剂(B)、发泡剂(C)、磷酸酯(D)及热塑性树脂(E)作为必须成分并按特定比例含有这些成分的混合物(F)在金属覆盖布上进行例如涂布等,形成由混合物(F)构成的阻燃性被膜。
作为溶解或分散各种原料的溶剂,可以列举苯、甲苯、二甲苯、甲乙酮、二甲基甲酰胺等有机溶剂。另外,还可以使用工业用汽油、石脑油、松节油等矿物油馏分。这些溶剂可以单独使用,也可以2种以上同时使用。
溶剂按以下方式适量添加,即,使通常的混合处理液的粘度为3000~25000cps,更优选为8000~20000cps。如果混合处理液的粘度不足3000cps,则混合处理液可能会渗漏到金属覆盖布的反面,从而损害外观品质,如果超过25000cps,则涂布性变差。
还有,为了防止渗漏,还可以预先用丙烯酸树脂、聚氨酯树脂、聚酯树脂等对金属覆盖布进行密封涂布(目止めコ一テインダ)。密封涂布可以是在涂布混合处理液的同一面上,也可以是其反面。另外,还可以以着色为目的在堵缝树脂中添加颜料,还可以为了进一步提高阻燃性而添加阻燃剂。此时,当然要选择除卤素类化合物及锑化合物以外的阻燃剂。
混合处理液的制备可以使用任何方法,只要能够使各种原料均匀分散混合即可。作为常规方法,可以列举通过螺旋桨搅拌进行分散混合、通过捏合机、辊子等的混匀进行分散混合。
另外,作为涂布方法,可以采用使用刮刀式涂布机、辊涂机、狭缝涂布机等的常规方法。另外,也可以是层压方式、粘接方式。将混合处理液涂布在金属覆盖布上后,通过干燥等除去溶剂,形成由混合物(F)构成的阻燃性被膜。
作为混合处理液相对于金属覆盖布的施加量,由混合物(F)构成的阻燃性被膜的重量优选为100~300重量%,特别优选为150~250重量%。如果施加量不足100重量%,则恐怕不能得到高阻燃性,如果超过300重量%,则不但布料失去柔软性,而且也不能期待进一步提高阻燃性。
由此,就可以得到本发明的阻燃性金属覆盖布。由混合物(F)构成的阻燃性被膜不仅可以形成于布的单面上,也可以形成于两个面上。另外,形成阻燃性被膜后,还可以进行赋予其它功能性的加工,或压延加工等特殊加工。
另外,使用本发明的阻燃性金属覆盖布形成电磁波屏蔽用衬垫时,作为芯材,可以使用柔软的、富于压缩复原性、具有三维结构的发泡体。作为这些发泡体的具体例子,有由有机硅树脂、三聚氰胺树脂等以阻燃性为特征的合成树脂构成的发泡体;在聚乙烯树脂、聚丙烯树脂、聚氨酯树脂、聚酯树脂、聚酰亚胺树脂、聚丁二烯树脂等中添加阻燃剂后进行发泡形成的发泡体;以及发泡后通过浸渍、涂布、喷涂等附加了阻燃剂的发泡体等。其中,由添加了阻燃剂的聚氨酯树脂发泡而形成的发泡体柔软且富于压缩复原性,工序数也少,经济性优异,因此是优选使用的。另外,所使用的阻燃剂没有特别限制,只要是除卤素类化合物、锑化合物、红磷以外的阻燃剂即可。
实施例
以下列举实施例对本发明进行详细说明,但是本发明绝不局限于以下实施例。实施例中的“份”及“%”是基于重量的。另外,所得到的阻燃性金属覆盖布的性能按以下方法评价。
(1)阻燃性
将得到的阻燃性金属覆盖布卷绕、粘接在阻燃性芯材上,制成电磁波屏蔽用衬垫,以供试验。使用イノアツクコ-ポレ-シヨン株式会社制造的聚氨酯发泡材料F-200G作为阻燃性芯材,将其切割成厚3mm,13mm×125mm,将得到的阻燃性金属覆盖布切割成33mm×125mm,将阻燃性被膜以接触的方式卷绕在上述聚氨酯发泡材料F-200G上,用180℃的熨斗进行粘接,制成电磁波屏蔽用衬垫。在这里,聚氨酯发泡材料F-200G当然不含有卤素化合物及锑化合物。对于这样得到的电磁波屏蔽用衬垫,按照UL94V-0试验法评价阻燃性。
(2)热熔粘接性
将阻燃性金属覆盖布切割成长100mm×宽25mm,准备两张,将一张布的阻燃性被膜面与另一张布的金属被膜面叠合,用180℃的熨斗按压2秒钟使其粘接。然后,在室内放置30分钟,剥离重合部分,测定粘接强度。测定仪使用オリエンテツク株式会社制造的Tensilon万能试验机STA-1225。
(3)软硬性
按照JIS L1096A法(45°悬臂法)测定阻燃性金属覆盖布的软硬性。在这里,数值越小表示手感越柔软。
(4)环境耐久性
将タバイ·エスペツク制造的恒温恒湿器PR3KPH设定为60℃,90%,将阻燃性金属覆盖布投入其中放置100小时。然后进行以下的(4-1)、(4-2)、(4-3)的评价。
(4-1)表面导通性
使用三菱化学(株)制造的Loresta-EP MCP-T360 ESP型电阻值测定器,测定阻燃性金属覆盖布的金属被膜表面(未形成阻燃性被膜的面)的电阻值。
(4-2)电磁波屏蔽性
按照关西电子工业振兴中心的KEC法,使用日本ヒユ-レツトパツ力-ド(株)制造的带有跟踪发生器的频谱分析器HP8591EM测定10MHz~1GHz下的电磁波衰减。
(4-3)金属被膜的变色、腐蚀性试验
对投入放置100小时之前的金属被膜表面和100小时后的金属被膜表面的变色、腐蚀进行比较观察。
(实施例1~2及比较例1~4)
实施例1
(金属覆盖织物的制备)将聚酯类纤维织物(经丝56dtex/36f,纬丝56dtex/36f)进行精练、干燥、热处理后,在含有氯化钯0.3g/L、氯化亚锡30g/L、36%盐酸300ml/L的40℃的水溶液中浸渍2分钟,然后进行水洗。接着,在酸浓度为0.1N的30℃的氟硼酸中浸渍5分钟,然后进行水洗。然后,在含有硫酸铜7.5g/L、37%福尔马林30ml/L、罗谢尔盐85g/L的30℃的无电解镀铜液中浸渍5分钟,然后进行水洗。接着,在含有氨基磺酸镍300g/L、硼酸30g/L、氯化镍15g/L,pH值为3.7,35℃的镍电镀液中按5A/dm2的电流密度浸渍10分钟,层叠镍,然后进行水洗。在织物上镀敷了铜10g/m2、镍4g/m2。得到的金属覆盖织物的目付(织物单位面积重量)为64g/m2
在得到的金属覆盖织物的单面上,使用刮刀涂布下述配方1的堵缝树脂,在130℃下干燥1分钟。施加量按固形物计为4g/m2。然后,用刮刀在同一个面上涂布下述配方2的混合处理液,在130℃下干燥2分钟。施加量按固形物计为130g/m2
配方1
トアクロンSA-6218                100份
((株)トウペ制,丙烯酸树脂,固形物18%)
レザミンUD交联剂                 1.5份
(大日精化工业(株)制,异氰酸酯交联剂,固形物75%)
甲苯                             适量
通过调节甲苯的添加量,将粘度调节为15000cps。
配方2
多磷酸铵                       22份(73.3)
三聚氰胺                       25份(83.3)
热膨胀性石墨                   11份(36.7)
磷酸三甲苯酯                   10份(33.3)
酯类聚氨酯树脂(熔点90℃)       30份(100)
二甲基甲酰胺                   43份
甲乙酮                         适量
通过调节甲乙酮的添加量,将粘度调节为8000cps。
实施例2
在按与实施例1相同的方式镀敷得到的金属覆盖织物的单面上,使用刮刀涂布配方3的堵缝树脂,在130℃下干燥1分钟。施加量按固形物计为6g/m2。然后,用刮刀在同一个面上涂布下述配方4的混合处理液,在130℃下干燥2分钟。施加量按固形物计为130g/m2
配方3
トアクロンSA-6218            100份
((株)トウペ制,丙烯酸树脂,固形物18%)
レザミンUD交联剂             1.5份
(大日精化工业(株)制,异氰酸酯交联剂,固形物75%)
环状苯氧基磷腈               8.5份
磷酸三甲苯酯                 2.5份
甲苯                         适量
通过调节甲苯的添加量,将粘度调节为18000cps。
配方4
多磷酸铵                    25份(83.3)
氰尿酸三聚氰胺              25份(83.3)
热膨胀性石墨                11份(36.7)
双酚A双(磷酸二苯酯)         12份(40)
酯类聚氨酯树脂(熔点90℃)    30份(100)
二甲基甲酰胺                43份
甲乙酮                      适量
通过调节甲乙酮的添加量,将粘度调节为8000cps。
比较例1
在按与实施例1相同的方式镀敷得到的金属覆盖织物的单面上,使用刮刀涂布配方1的堵缝树脂,在130℃下干燥1分钟。施加量按固形物计为4g/m2。然后,用刮刀在同一个面上涂布下述配方5的混合处理液,在130℃下干燥2分钟。施加量按固形物计为130g/m2
配方5
多磷酸铵                    50份(166.7)
氰尿酸三聚氰胺              5份(16.7)
热膨胀性石墨                2份(6.7)
双酚A双(磷酸二苯酯)         2份(6.7)
酯类聚氨酯树脂(熔点90℃)    30份(100)
二甲基甲酰胺                43份
通过调节二甲基甲酰胺的添加量,将粘度调节为8000cps。
比较例2
在按与实施例1相同的方式镀敷得到的金属覆盖织物的单面上,使用刮刀涂布配方1的堵缝树脂,在130℃下干燥1分钟。施加量按固形物计为5g/m2。然后,用刮刀在同一个面上涂布下述配方6的混合处理液,在130℃下干燥2分钟。施加量按固形物计为130g/m2
配方6
环状膦酸酯    25份(83.3)
氰尿酸三聚氰胺                   20份(66.7)
热膨胀性石墨                     18份(60)
双酚A双(磷酸二苯酯)              15份(50)
酯类聚氨酯树脂(熔点90℃)         30份(100)
二甲基甲酰胺                     43份
通过调节二甲基甲酰胺的添加量,将粘度调节为8000cps。
对于环状膦酸酯,使用(5-乙基-2-甲基-1,3,2-二氧磷杂环己烷-5-基)甲基二甲基膦酸酯-P-氧化物和双[(5-乙基-2-甲基-1,3,2-二氧磷杂环己烷-5-基)甲基]甲基膦酸酯-P,P’-二氧化物的重量比为8∶2的混合物。
比较例3
在按与实施例1相同的方式镀敷得到的金属覆盖织物的单面上,使用刮刀涂布配方1的堵缝树脂,在130℃下干燥1分钟。施加量按固形物计为4g/m2。然后,用刮刀在同一个面上涂布下述配方7的混合处理液,在130℃下干燥2分钟。施加量按固形物计为130g/m2。再用酯类热熔性聚氨酯片材在同一面上进行层压处理,设置粘接层。
配方7
多磷酸铵                       30份(100)
氰尿酸三聚氰胺                 24份(80)
热膨胀性石墨                   11份(36.7)
双酚A双(磷酸二苯酯)            15份(50)
酯类聚氨酯树脂(熔点150℃)      30份(100)
二甲基甲酰胺                   43份
通过调节二甲基甲酰胺的添加量,将粘度调节为8000cps。
比较例4
在按与实施例1相同的方式镀敷得到的金属覆盖织物的单面上,使用刮刀涂布配方1的堵缝树脂,在130℃下干燥1分钟。施加量按固形物计为4g/m2。然后,用刮刀在同一个面上涂布下述配方8的混合处理液,在130℃下干燥2分钟。施加量按固形物计为130g/m2
配方8
非醚溴化合物               47份(156.7)
三氧化锑                   24份(80)
双酚A双(磷酸二苯酯)        14份(46.7)
酯类聚氨酯树脂(熔点90℃)   30份(100)
二甲基甲酰胺               26份
通过调节二甲基甲酰胺的添加量,将粘度调节为8000cps。
对于上述实施例及比较例的评价结果示于表1中。
表1
阻燃性 热熔粘接性(N/in) 软硬性(mm) 环境耐久性
表面导通性长/宽(Ω)  屏蔽生(dB) 变色·腐蚀
 10MHz 100MHz
实施例1  V-0  20  51  0.02/0.03  90 88 无变色
实施例2  V-0  20  56  0.03/0.03  88 87 无变色
比较例1  V-2  20  52  0.04/0.03  91 89 无变色
比较例2  V-0  20  53  0.25/0.34  67 60 有变色
比较例3  V-0  20  76  0.03/0.04  90 87 无变色
比较例4  V-0  20  52  0.02/0.03  90 88 无变色
关于实施例1及实施例2,可以得到一种阻燃性金属覆盖布,该阻燃性金属覆盖布在不含有卤素类化合物及锑化合物的情况下,具备UL 94的V-0这种高阻燃性,在具有优异的柔软性、电磁波屏蔽性的同时,还抑制了金属被膜的变色、腐蚀。但是,作为比较例1,由于各成分的配合比例不合适,不能达到足够的阻燃性。另外,作为比较例2,尽管由于在阻燃剂(A)中使用了环状膦酸酯作为多磷酸铵和/或多磷酸三聚氰胺以外的磷类阻燃剂,在阻燃性上满足了预期性能,但是可确认金属被膜的变色、腐蚀,并不能经受实用。作为比较例3,因树脂层叠数多而手感硬,不能期待衬垫具有柔软性,还增加了工序数,在经济上也是不可取的。作为比较例4,虽然满足了全部评价项目,但是由于使用了卤素化合物和锑化合物,有可能引起环保问题。

Claims (5)

1.一种阻燃性金属覆盖布,其特征在于,在金属覆盖布的至少一个面上形成有阻燃性被膜,所述阻燃性被膜是由选自多磷酸铵及多磷酸三聚氰胺的阻燃剂(A)、选自三聚氰胺、氰尿酸三聚氰胺及三(2-羟乙基)异氰酸酯的阻燃助剂(B)、选自热膨胀性石墨、偶氮甲酰胺及N,N’-二亚硝基五亚甲基四胺的发泡剂(C)、磷酸酯(D)及熔点为70~130℃的热塑性树脂(E)的混合物(F)构成,其中,(A)∶(B)∶(C)∶(D)∶(E)的比例以重量比计为15~100∶50~100∶30~60∶15~50∶100。
2.根据权利要求1所述的阻燃性金属覆盖布,其特征在于,磷酸酯(D)的磷含量为6~11重量%,并且不含有卤素。
3.根据权利要求1或2所述的阻燃性金属覆盖布,其特征在于,热塑性树脂(E)选自聚氨酯树脂、丙烯酸树脂及聚酯树脂。
4.根据权利要求1~3中任一项所述的阻燃性金属覆盖布,其特征在于,由混合物(F)构成的阻燃性被膜的重量相对于金属覆盖布为100~300重量%。
5.一种电磁波屏蔽用衬垫,其是将权利要求1~4中任一项所述的阻燃性金属覆盖布卷绕在由具备阻燃性的合成树脂发泡体构成的芯材外侧而形成。
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DE602006017531D1 (de) 2010-11-25
EP1873299A1 (en) 2008-01-02
JP4663386B2 (ja) 2011-04-06
TW200700607A (en) 2007-01-01
EP1873299B1 (en) 2010-10-13
EP1873299A4 (en) 2010-02-17
CN101208469B (zh) 2010-12-01
TWI418682B (zh) 2013-12-11

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