CN101878108B - 具有高机械强度的蜂窝结构和由其制得的制品 - Google Patents
具有高机械强度的蜂窝结构和由其制得的制品 Download PDFInfo
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- CN101878108B CN101878108B CN200880118313XA CN200880118313A CN101878108B CN 101878108 B CN101878108 B CN 101878108B CN 200880118313X A CN200880118313X A CN 200880118313XA CN 200880118313 A CN200880118313 A CN 200880118313A CN 101878108 B CN101878108 B CN 101878108B
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- honeycomb
- paper wood
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- resin
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Abstract
本发明公开了由聚合纸材制得的高机械强度蜂窝结构,所述聚合纸材包含5至35体积份的固体材料和65至95体积份的空隙,所述纸材具有等于或高于0.33mgf/(g/m2)3的归一化弯曲峰值载荷和等于或高于50s/100mL的葛尔莱空气阻力。
Description
发明背景
1.发明领域
本发明涉及由轻质聚合纸材制得的高机械强度蜂窝结构。
2.背景技术
基于芳族聚酰胺纸材的蜂窝结构可用于其中强度与重量比、硬度与重量比以及某些其它按重量归一化的特性对性能至关重要的应用中。众多实例可见于航空航天应用中。传统上,此类蜂窝结构由纸材制造,所述纸材可用间位芳族聚酰胺纤维和间位芳族聚酰胺纤条体粘合剂制得,或可用高模量对位芳族聚酰胺纤维和间位芳族聚酰胺纤条体粘合剂制得。通常,强韧的蜡光芳族聚酰胺纸可用于制备相应的蜂窝结构。使此类纸材和蜂窝结构最优化,以提供良好的一系列蜂窝结构剪切、压缩和其它特性。然而,存在其中压缩强度增强显著高于其它机械特性如剪切的应用。对用于飞机、火车等的地板材料中的夹心面板而言尤其如此。压缩强度最优化的蜂窝结构能够提供额外的重量并且能够节省费用。因此,所需要的是以纸材和蜂窝结构制造方法同时最优化的方式制得的蜂窝结构,以在指定的蜂窝泡孔尺寸和密度下提供蜂窝结构的最大压缩强度。
发明简述
本发明涉及包含多个互连的壁的蜂窝结构,所述壁具有限定多个蜂窝泡孔的表面,其中所述泡孔壁由纸材形成,所述纸材包含:
a)5至35体积份的固体聚合材料,和
b)65至95体积份的空隙,并且
其中所述纸材具有等于或大于0.33mgf/(g/m2)^3的归一化弯曲峰值载荷和等于或大于50s/100mL的葛尔莱空气阻力。
(Mgf是指毫克力,而g/m2是指克/平方米)。
本发明还涉及其中所述纸材具有树脂涂层的蜂窝结构以及由所述蜂窝结构形成的制品如面板。
附图简述
图1a和1b为六边形形状的蜂窝结构的图示。
图2为六边形单元形状的蜂窝结构的另一图示。
图3为具有面片材的蜂窝结构的例示。
发明详述
本发明涉及由聚合纸材制得的蜂窝结构,其中所述蜂窝结构具有优异的压缩强度。在压缩下,蜂窝结构由于泡孔壁压曲而破坏。泡孔壁的抗压曲性是非常好的蜂窝结构压缩强度指标。因此,纸片的测定可提供在压力荷载下包含相同纸材的蜂窝结构性能如何的相对指标。
由于在蜂窝结构的压缩强度与蜂窝泡孔壁中所用的纸材之间存在这样的相关性,因此在本公开中使用纸材测试方法。此纸材方法基于归一化弯曲峰值载荷,其将在下文中详细描述。归一化弯曲峰值载荷数值越高,体现为具有由所述纸材形成的泡孔壁的蜂窝结构的压缩强度就越高。
图1a为本发明蜂窝结构的一个例示。图1b为图1a所示蜂窝结构的正交视图,图2为该蜂窝结构的三维视图。所示为具有六边形单元2的蜂窝结构1。图2中示出了蜂窝结构的“Z”向或厚度。该尺寸还被称为“T”向并且是沿着其施加压缩力的方向。图3为蜂窝结构夹心面板的例证,所述夹心面板具有与所述蜂窝结构相粘合的面板7和8。所述面板通常为金属或纤维强化的塑料。还需要粘合剂层6以提供足够的粘合作用。
六边形泡孔示于图中;然而其它几何排列也是可能的,其中正方形泡孔、过度扩展泡孔和弯曲形泡孔是最常见的可能排列。此类泡孔类型在本领域中是熟知的,有关可能的几何单元类型的详细信息,参考HoneycombTechnology(T.Bitzer著,Chapman & Hall出版社,1997年)。
所述蜂窝结构具有由聚合纸材提供的泡孔壁,所述泡孔壁的平面优选平行于蜂窝结构的Z向。用于蜂窝泡孔壁的聚合纸材包含5至35体积份的固体材料和65至95体积份的空隙,所述纸材具有等于或高于0.33mgf/(g/m2)^3的归一化弯曲峰值载荷和不小于50s/100mL的葛尔莱空气阻力。
可根据无空隙纸材相对于具有空隙的纸材的已知密度,或通过具有空隙的纸材的图像分析,确定聚合纸材中的空隙体积。
优选的纸材包含纤维和纤条体。优选的范围为20-70重量%纤维和相应的30-80重量%纤条体。纤维和纤条体的优选聚合材料为间位芳族聚酰胺。
然而应当理解,纤维和纤条体的组成可变化。作为航空航天应用的例证,优选的纤维类型包括芳族聚酰胺、液晶聚酯、聚苯并唑、聚吡啶并唑、碳、玻璃以及其它无机纤维或它们的混合物,并且优选的纤条体类型包括聚(间苯二甲酰间苯二胺)、聚(对苯二甲酰对苯二胺)、聚磺酰胺(PSA)、聚苯硫醚(PPS)、和聚酰亚胺。
在形成蜂窝结构之前或之后,可用树脂涂布所述聚合纸材。可使用在施用到蜂窝结构中的纸材上之后交联的树脂,以使最终特性如硬度和强度最优化。树脂的实例包括环氧化物、苯酚、丙烯酸、聚酰亚胺、以及它们的混合物。
如前所述,聚合纸材具有50s/100mL或更高的葛尔莱空气阻力,这被认为是高空气阻力,应归因于纸材的低渗透性。纸材的这种低渗透性有利于在后续树脂涂布期间(如通过浸渍)仅使树脂不完全渗透到纸材的空隙中。可在蜂窝结构形成之前或之后,将涂层涂布到纸材上;然而,在许多情况下优选蜂窝结构形成后的涂层。不完全树脂渗透可有助于获得具有优异压缩强度,同时树脂重量低的蜂窝结构。
使最大压缩强度与重量比率最优化的蜂窝结构,对于地板材料和其它应用中的重量节省而言是重要的。在此情况下,相对于蜂窝结构的其它机械特性,蜂窝结构的压缩强度通常具有较高的优先权。
所述纸材的厚度和重量取决于蜂窝结构的最终用途或所需的特性。作为例证,适宜的厚度为3至10密耳(75至250微米),并且适宜的重量为0.5至6盎司/平方码(15至200克/平方米)。
本文所用术语“芳族聚酰胺”是指聚酰胺,其中至少85%的酰胺(-CONH-)连接基直接连接到两个芳族环上。添加剂可与所述芳族聚酰胺一起使用。实际上已发现,可将多达10重量%的其他聚合材料与芳族聚酰胺共混,或者可使用共聚物,所述共聚物具有多达10%的替代芳族聚酰胺的二胺的其他二胺,或多达10%的替代芳族聚酰胺的二酰氯的其他二酰氯。芳香族聚酰胺纤维和这些纤维的各种形式可以商标NOMEX和Kevlar纤维得自E.I.du Pont de Nemours and Company(Wilmington,Delaware),并且可以商标TeijinConex和Twaron得自Teijin,Ltd.。可商购获得的聚苯并唑纤维包括Zylon PBO-AS(聚(对亚苯基-2,6-苯并双噁唑))纤维、Zylon PBO-HM(聚(对亚苯基-2,6-苯并双噁唑))纤维,这二者均得自Toyobo Co.Inc.(Osaka,Japan)。可商购获得的碳纤维包括得自TohoTenax America,Inc(Rockwood,TN)的Tenax纤维。可商购获得的液晶聚酯纤维包括得自Kuraray America Inc.(New York,NY)的Vectran HS纤维。
纸材还可包含无机颗粒,代表性颗粒包括云母、蛭石等;这些性能增强的添加剂的加入可向所述纸材和最终蜂窝结构赋予特性,如改善的耐火性、热导率、外形稳定性等。
所述纸材可采用本领域熟知的常规方法,在从实验室用筛分仪至商业级造纸机的任何规模设备上形成,包括常用的机器如长网造纸机或斜网造纸机。由各种类型纤维和纤条体形成纸材的例证性方法,可参见授予Gross的美国专利和专利申请3,756,908;授予Tokarsky的4,698,267和4,729,921;授予Hesler等人的5,026,456;授予Kirayoglu等人的5,223,094;授予Kirayoglu等人的5,314,742。
纸材形成之后,优选不将其压光。可通过纸材压光来实现轻度压实,前提条件是空隙度不降低至65%以下。还可进行纸材的热处理以增加弯曲峰值载荷或增进一种或多种其它机械特性。纸材上的此类处理可在形成蜂窝结构之前或之后进行。
所述纸材中的纤维可为切割纤维(絮状物)、纸浆或它们混合物的形式。如本文所用,术语“纸浆”是指具有纤柄和通常自纤柄延伸的原纤的纤维材料,其中纤柄通常为柱形并且直径为约10至50微米,而原纤为通常与纤柄连接的细毛发状构件,经测量其直径仅为一微米的若干分之一或几微米,并且长度为约10至100微米。制备芳族聚酰胺纸浆的例证性方法一般公开于美国专利5,084,136中。
如本文所用,术语“沉析纤维”是指基本上为二维薄膜状小颗粒的细分聚合物产品,其具有100至1000微米的长度和宽度和0.1至1微米的厚度。通常通过使聚合物溶液流动至与该溶液的溶剂不混容的液体的凝固浴中来制备纤条体。聚合物溶液流在聚合物凝固时受到剧烈剪切力和紊流的影响。
将纸材转变成蜂窝结构的方法是本领域普通技术人员所熟知的并且包括扩展和起皱。扩展方法尤其适用于制备地板级内芯。此方法进一步详述于“Engineered Materials Handbook”第1卷-Composites(ASMInternational,1988)第721页中。
地板芯的最终机械强度是若干因素组合的结果。主要的已知促成因素是纸材组成和厚度、泡孔尺寸和最终芯密度,如用树脂涂布后。泡孔尺寸是蜂窝内芯泡孔内的内切圆的直径。就地板芯而言,典型的泡孔尺寸在1/8”至3/8”(3.2mm至9.6mm)范围内,但是其它尺寸也是可能的。
还已知,蜂窝内芯在压缩荷载下被破坏的主要机制是其泡孔壁压曲。这种压曲非常类似于超出弯曲峰值载荷。因此对于所呈现的数据,弯曲峰值载荷已被用作所述纸材的特征,由此作为泡孔壁的抗压曲度。纸材的峰值载荷越高,内芯的压缩值越高。
一个壁的弯矩M可如下计算(“Mechanical Engineers′Handbook”,Myer Kutz编辑,Wiley-Interscience Publication,1986):
M=r(E*b*h^3)/12
其中r=曲率半径,E=弹性模量,b=泡孔壁宽度,而h=纸材厚度。在其中测定无蜂窝结构的纸材的实例中,b=纸材宽度。
常规使用具有相同密度和不同厚度的纸材来制备蜂窝结构,例如具有不同厚度的标准Nomex T412型纸材是可商购获得的。对于用于制备蜂窝结构的相同密度的纸材,树脂涂布前的纸材厚度与所述材料的基重成正比。对于具有恒定密度的同类型纸材而言广义相关的是,弯矩和弯曲峰值载荷以相同的方式随着纸材基重的相应变化而变化。因此,为显示纸材密度和附加特殊处理的影响,将弯曲峰值载荷相对于泡孔壁材料基重的3次幂归一化。这消除了影响弯曲峰值载荷,从而影响压缩强度时纸材基重所起的作用。
因此如本文所用,“归一化的弯曲峰值载荷”是指以毫克(mg)力为单位的最大弯曲载荷除以纸材或涂层纸材基重(以g/m2为单位)的3次幂。
在下列实施例中,除非另外指明,所有份数和百分比均按重量计。
测试方法
使用由ASTM D374-99测得的纸材厚度和由ASTM D646-96测得的基重来计算纸材密度。使用ASTM D1907-07来测定纤维的纤度。
根据描述于ASTM D5934-02中的三点方法,使用长1英寸(2.54cm)、宽4英寸(10.16cm)的样本,并且采用0.5英寸(1.27cm)支撑间距、0.125英寸(3mm)荷载头半径和0.1in/min(2.54mm/min)加载速率,测定纸材和树脂涂布/浸渍纸材的弯曲峰值载荷。测定归一化弯曲峰值载荷,为以毫克(mg)力为单位的最大弯曲载荷除以纸材或涂层纸材基重(以g/m2为单位)的3次幂。
纸材Gurley孔隙率的测定方法为:根据TAPPI T460,使用1.22kPa的差压来测量约6.4平方厘米圆形面积纸材的空气阻力,以秒每100毫升圆柱体位移为单位。根据ASTM C365测定蜂窝结构切片的稳定压缩度,同时由ASTM C273评定剪切负荷和模量。
实施例
实施例1和2
如授予Gross的美国专利3,756,908中所述,通过使用约50重量%的聚(间苯二甲酰间苯二胺)纤条体和约50重量%的间位芳族聚酰胺絮状物制成了间位芳族聚酰胺纸材。所述间位芳族聚酰胺絮状物为线密度为约0.22特(2.0旦尼尔)并且长约6.4mm的絮状物,切自以商品名NOMEX由E.I.du Pont de Nemours and Company(Wilmington,DE)(DuPont)出售的纤维。
制成后,通过使所述纸材通过表面温度为约325℃的两个热金属辊,将其进一步热处理。
所述纸材的特性示于表1中。
实施例1和2采用两种不同的基重,其分别为42gsm和62gsm。
比较实施例1和2
如实施例1和2所述制成纸材,但是不实施附加的热处理。所述纸材的特性示于表1中。
比较实施例1和2的基重分别为40gsm和60gsm。
比较实施例3和4
如实施例1所述制成纸材。制成后,在约3000N/cm的线性压力下,使所述纸材在加热至350℃的两个金属辊之间压光。所述纸材的特性示于表1中。
比较实施例3和4的基重分别为42gsm和61gsm。
比较实施例5和6
如实施例1所述制成纸材并且热处理,但是金属辊的表面温度为260℃。所述纸材的特性示于表1中。
比较实施例5和6的基重分别为40gsm和61gsm。
实施例3和4
将得自实施例1和2的10”x 8”纸材样本浸渍于由Durez Corporation(Novi,MI)提供的Plyophen 23900型酚醛树脂溶液中。浸渍后,通过吸墨纸将过量的树脂移除,并且使用固化循环,将浸渍后的纸材加热处理以固化树脂:在82℃下15分钟,在121℃下15分钟,并且在182℃下60分钟。最终片材结构的特性示于表2中。
比较实施例7和8
将得自比较实施例3和4的10”x8”纸材样本浸渍于Plyophen 23900酚醛树脂溶液中。浸渍后,通过吸墨纸将过量的树脂移除,并且使用与实施例3和4相同的固化循环,将浸渍后的纸材加热处理以固化树脂。最终片材结构的特性示于表2中。
实施例5
依照下列步骤可制得蜂窝结构块。
由实施例1中的纸材制得蜂窝结构块。此方法是本领域技术人员熟知的,但以下列方式概述。
将粘合剂树脂节线施加到纸材表面,粘合剂线的宽度为1.78mm。节距,即一条线的开始处与下一条线开始处之间的直线距离,为5.3mm。节线粘合剂树脂为50%固体的溶液,其包含70重量份环氧树脂Epon 826,其得自Hexion Specialty Chemicals(Houston,TX);30重量份的弹性体改性的环氧树脂,其由Wilmington Chemical Corp(Wilmington,DE)出售,称为Heloxy WC 8006;54重量份的双酚A-甲醛树脂固化剂,其由Union Carbide Corp.出售,称为UCAR BRWE 5400的;0.6重量份的作为固化催化剂的以二元醇醚为溶剂的2-甲基咪唑,其由Dow Chemical Company(Midland,MI)出售,称为Dowanol PM;7重量份的聚醚树脂,其由Miller-Stephenson Chemical Co.(Danbury,CT)出售,称为Eponol 55-B-40;和1.5重量份的热解法二氧化硅,其由Cabot Corp.(Billerica,MA)出售,称为Cab-O-Sil。于130℃下在炉中将粘合剂在纸材上部分地干燥6.5分钟。
将具有粘合剂节线的片材平行于节线切割以形成50个小片材。切出的片材相互堆叠,使得每个片材按所施加粘合剂的一半节距或一半间隔转移到另一个片材上。移位可交替地发生在一侧或另一侧上,使得最终堆叠件均匀地竖直。然后在345kPa和140℃第一温度下将片材堆叠件热压30分钟,然后在177℃温度下热压40分钟,使得节线粘合剂固化,从而粘合邻近的片材。
然后使用扩展架将粘合的芳族聚酰胺片材沿与堆叠方向相反的方向扩展,以形成具有等边横截面的单元。每个片材在彼此间被延伸,使得片材沿粘合的节线的边缘被折叠,并且未粘合的部分沿张力方向被延伸,从而使片材彼此分离。
在扩展后,使特定机架中的蜂窝结构块在温度升至270℃的炉中热处理,并且保持30分钟,以使所述板块以其扩展形状固定或固化。
然后将蜂窝结构块放置于包含PLYOPHEN 23900酚醛树脂溶液的浸渍浴或浸渍罐中,所述酚醛树脂得自Durez Corporation。用树脂浸渍之后,从浴中拿出蜂窝结构,然后使用热空气在干燥炉中干燥蜂窝结构。以此方式将蜂窝结构从室温加热至82℃,然后将该温度保持15分钟。然后将温度升至121℃并将该温度再保持15分钟,接着将该温度升至182℃并将该温度保持60分钟。将浸渍和固化步骤重复8次。浸渍和固化过的压缩强度经改善的最终蜂窝结构具有约112kg/m3的体积密度。
实施例6
以下列方式制得蜂窝结构块。使用依照比较实施例2制得的纸材作为原料制备所述板块。如实施例5所述,制备蜂窝结构块,不同的是,在约320℃温度的炉中将所述扩展板块加热处理20分钟。浸渍和固化过的蜂窝结构的最终体积密度特性类似于得自实施例5的蜂窝结构。
从表1的数据可以看出,仅使用所制成的纸材而不是压光纸材,仅提供归一化弯曲峰值载荷的微小增加(分别为比较实施例3至4和1至2)。而且,在低于最佳温度下热处理所制成的纸材不改变归一化弯曲峰值载荷(比较实施例5和6)。然而在压光期间使压光纸经受非常高的温度,其归一化弯曲峰值载荷甚至稍低于所制成的纸材。(比较实施例3和4)。因此,仅具有低密度/高空隙度并且经受必要高温的纸材(实施例1和2)提供蜂窝泡孔壁归一化弯曲峰值载荷的显著增加。从同表中可以看出,2密耳厚的NOMEX T412型商业压光纸材提供与得自我们比较实施例3的压光纸大致相同的特性。
具有不同基重的纸材(如得自实施例1和2以及比较实施例1至6的纸材)的归一化弯曲峰值载荷值的非常接近证实了弯曲峰值载荷归一化方法选择正确。
实施例3和4示出了如何用树脂涂布来进一步增加本发明蜂窝泡孔壁的弯曲峰值载荷。然而,归一化剥离载荷下降。这可如下解释:与所述纸材密度相比,固化的酚醛树脂密度(约1.1g/cm3)较高,因此厚度的相对增加小于重量的相对增加。
比较实施例7和8表明,在用某些树脂涂布高密度/低空隙度压光纸材后,与本发明泡孔壁纸材相比,其弯曲峰值载荷和归一化弯曲峰值载荷大大降低。
在所有情况下,在所述纸材的横向测定弯曲峰值载荷,这是因为所述方向与由上述常规方法制得的蜂窝泡孔壁的Z向相符。
表1:间位芳族聚酰胺纸材的性质
表2:涂层纸材的性质
实施例 | 所用的纸材 | 最终结构中的树脂含量,重量% | 弯曲峰值载荷(gf) | 纸材横向上的归一化弯曲峰值载荷,mgf/(g/m2)^3 |
实施例3 | 实施例1 | 50 | 169 | 0.29 |
比较实施例7 | 比较实施例3 | 25 | 28.1 | 0.16 |
实施例4 | 实施例2 | 46 | 411 | 0.27 |
比较实施例8 | 比较实施例4 | 25 | 47.1 | 0.09 |
实施例7
通过使由DuPont出售的1.5T412 NOMEX纸材的制成(未压光)前体通过表面温度为约325℃的两个金属辊来将其热处理。热处理后的最终纸材具有31.5g/m2的基重,0.10mm的厚度,和0.31g/cm3的密度。固体占所述纸材体积的约23%,而剩余的77%体积为空隙。
将基于溶剂的环氧化物粘合剂树脂节线施用到纸材表面上并且移除溶剂。粘合剂线的宽度为1.78mm,并且节距或一条线与下一条线起始间的直线距离为6.7mm。
将具有粘合剂节线的片材平行于节线切割以制成小片材。将切片堆叠,使得邻近片材内的节线相对于彼此具有交错半个节距。移位可交替地发生在一侧或另一侧上,使得最终堆叠件均匀地竖直。然后热压片材堆叠件,致使节线粘合剂固化,从而将邻近片材粘合以形成板块。
然后将蜂窝结构块放置于浸渍浴或浸渍罐中,其中包含以乙醇为溶剂的可熔酚醛树脂溶液。在用树脂浸渍后,从所述罐中取出所述板块,并且使过量树脂流干。然后将所述板块放置于热空气干燥炉中,通过以若干步从室温加热至约180℃,移除溶剂并且固化树脂。重复浸渍和固化循环,直至获得所需的板块密度。通过与节线成合适角度切割所述板块,获得蜂窝结构切片或片材。然后通过在约180℃下热处理,将这些蜂窝结构切片后固化。
对于三种不同的芯密度,测定3.3mm泡孔尺寸的蜂窝结构切片的机械特性。依照分别用于稳定压缩强度、L和W剪切强度以及L和W模量的ASTM方案,实施测试。结果示于表3中。
将得自实施例7的内芯的机械特性与通常得自可商购获得的内芯的具有类似泡孔尺寸(3mm)、切片厚度(12.5mm)和密度(48和64kg/m3)的那些的机械特性进行比较。所选产品为得自Hexcel Corporation(CasaGrande,AZ)的HRH10级材料。这些内芯由具有约40.7g/m2标称基重的2密耳NOMEX 2T412型压光纸材制得,其比用于实施例7中的纸材重约30%。HRH10内芯的其它详情包含于Hexcel手册“HexWeb HoneycombAttributes and Properties”中。此对比数据示于表4中。由得自实施例7的未压光纸材制得的蜂窝结构呈现出与由更重的压光纸材制得的类似蜂窝结构几乎相同的压缩强度范围。本发明内芯的剪切强度比对照物稍好,而剪切模量显著更高。
表3:得自实施例7的蜂窝结构切片的机械特性
在酚醛树脂溶液中的浸渍次数 | 蜂窝结构芯密度(kg/m3) | 稳定的压缩强度(Mpa) | L-剪切强度(Mpa) | L-剪切模量(Mpa) | W-剪切强度(Mpa) | W-剪切模量(Mpa) |
2 | 41.3 | 1.17 | 1.17 | 52.3 | 0.538 | 23.9 |
3 | 49.0 | 1.72 | 1.36 | 63.1 | 0.683 | 33.5 |
4 | 63.9 | 2.50 | 1.85 | 78.5 | 1.05 | 41.6 |
表4:得自实施例7的内芯与可商购获得的密度相似内芯的机械特性比
较
芯类型 | 标称芯密度(kg/m3) | 稳定的压缩强度(Mpa) | L-剪切强度(Mpa) | L-剪切模量(Mpa) | W-剪切强度(Mpa) | W-剪切模量(Mpa) |
HexcelHRH10-1/8-3 | 48 | 2.23 | 1.21 | 41.3 | 0.69 | 24.1 |
实施例5 | 49 | 1.72 | 1.36 | 63.1 | 0.68 | 33.5 |
HexcelHRH10-1/8-4 | 64 | 3.96 | 1.76 | 59.3 | 0.96 | 32.4 |
实施例5 | 64 | 2.50 | 1.85 | 78.5 | 1.05 | 41.6 |
Claims (4)
1.包含多个互连的壁的蜂窝结构,所述多个互连的壁具有限定多个蜂窝泡孔的表面,其中所述泡孔壁由纸材形成,所述纸材包含:
a)5至35体积份的固体聚合材料,和
b)65至95体积份的空隙,并且
其中所述纸材包含间位芳族聚酰胺纤维和间位芳族聚酰胺纤条体,并且
其中所述纸材具有等于或大于0.33mgf/(g/m2)^3的归一化弯曲峰值载荷和等于或大于50s/100mL的葛尔莱空气阻力,并且
其中所述纸材用树脂涂布。
2.权利要求1的蜂窝结构,其中所述纸材包含20-70重量%的间位芳族聚酰胺纤维和30-80重量%的间位芳族聚酰胺纤条体。
3.权利要求1的蜂窝结构,其中所述树脂选自酚醛树脂、聚酰亚胺、环氧化物以及它们的组合。
4.具有蜂窝结构的结构面板,所述蜂窝结构包含多个互连的壁,所述多个互连的壁具有限定多个蜂窝泡孔的表面,其中所述泡孔壁由纸材形成,所述纸材包含:
a)5至35体积份的固体聚合材料,和
b)65至95体积份的空隙,并且
其中所述纸材包含间位芳族聚酰胺纤维和间位芳族聚酰胺纤条体,并且
其中所述纸材具有等于或大于0.33mgf/(g/m2)^3的归一化弯曲峰值载荷和等于或大于50s/100mL的葛尔莱空气阻力,并且至少一个面板粘附到所述蜂窝结构的外部部分,并且
其中所述面板由树脂浸渍的纤维或金属制成。
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US20100047515A1 (en) * | 2008-08-21 | 2010-02-25 | E. I. Du Pont De Nemours And Company | Honeycomb Core Having a High Compression Strength and Articles Made from the Same |
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KR20160139541A (ko) | 2015-05-28 | 2016-12-07 | 코오롱인더스트리 주식회사 | 허니콤용 아라미드 페이퍼 및 그의 제조방법 |
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