CN113242789A - 带有增强线的柔性透明材料 - Google Patents
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Abstract
一种半透明或透明复合柔性片材,其包括:‑至少一个包含高强力纱线4的增强层2;和‑对可见光半透明或透明的氟化聚合物膜1,其与所述增强层2成一体;所述柔性片材的特征在于,增强层2是透光率大于40%且包含基于杨氏模量大于50GPa的芳族嵌段聚酯的高强力纱线4的织物,所述纱线具有阻挡紫外线的材料的鞘40。
Description
技术领域
本发明涉及允许光通过的复合材料。特别地,本发明涉及柔性建筑材料领域,在此领域中,它们可以例如用于形成屋顶材料或立面元件,或者形成临时遮蔽物。
出于机械和美学原因,这种类型的柔性材料优选被拉伸。更准确地说,本发明特别适用于允许自然光通过的屋顶材料或立面元件的生产。
背景技术
在本发明的上下文中,术语“屋顶材料”是指构成建筑物(例如房屋、棚或体育场)屋顶的材料,或者实际上是旨在将内部空间与降水隔离的物体的任何表面,例如帐篷材料、温室覆盖物,或者实际上是机动车辆的软顶。
当形成屋顶材料时,使用柔性材料在现有技术中是众所周知的。事实上,与由刚性瓦构成的屋顶材料相比,这些柔性材料可用于获得美学上精致的屋顶材料,同时产生对于例如降雨的降水的不渗透性。
一般来说,这种类型的柔性材料是已知的,其具有透明的特征,允许自然光穿过,进入由屋顶材料保护的空间。
例如,美国专利申请US 4 013 812描述了一种用于生产屋顶材料的膜,其由涂有塑料材料的玻璃纤维格栅和透明塑料材料膜组成。
类似地,美国专利申请US 3 623 937描述了一种复合材料,该复合材料由与涂有聚氯乙烯的玻璃纤维编织网络结合的透明塑料材料膜组成。
尽管这些材料是透明的,但它们的结构中包含玻璃纤维,因此对处理、安装和使用有特殊限制。
事实上,由于玻璃的机械特征,玻璃纤维在皱折折叠后的强度低。为了保持其完整性和机械性能,因此,这种材料的用途仅限于绝对平坦的结构或具有非常轻微曲率的结构。因此,这自然排除了材料必须承受重复的或甚至循环的机械载荷的应用,例如当从折叠状态到展开状态,或者实际上从卷起状态到展开状态时。这也对与这些材料在生产地点和安装地点之间的运输相关的装载施加了限制,该限制随着结构尺寸的增加而增加。
发明内容
因此,本发明要解决的技术问题是提出一种具有机械增强纱线的透明柔性材料,该材料具有使其能够用于将承受机械折叠载荷的应用中的机械特征,该机械折叠载荷可以是特定的或多重的,或甚至是循环的。
因此,本发明提出通过半透明或透明的复合柔性片材来解决该技术问题,该复合柔性片材包含至少一个包含高强力纱线的增强层和对可见光半透明或透明的聚合物膜,所述聚合物膜与所述增强层成一体。
更准确地,该柔性片材的特征在于,增强层是透光率大于10%,优选大于30%,或甚至40%和高度优选45%的织物,并且包含基于杨氏模量大于50Gpa的芳族嵌段聚酯的高强力纱线,所述纱线具有阻挡紫外线辐射的材料的鞘。
术语“阻挡紫外线辐射”是指鞘对紫外线辐射的透射度小于50%。
有利地,所述织物可以是格栅或编织材料。
有利地,因为使用了连续的膜,所以该隔膜对液态水不可渗透。因此,本发明的柔性材料可以用于屋顶材料的生产,或者通常用于水密结构的生产。
保护增强纱线免受紫外线辐射的鞘可以以多种方式生产。因此,根据本发明的第一个实施方案,该鞘以连续的方式包覆高强力纱线。该鞘由涂覆在增强纱线上的材料形成。换句话说,涂覆材料形成覆盖整个增强纱线的连续鞘。该鞘可以通过挤出到增强纱线上来生产,任选地在旨在增加鞘材料在纱线上的抓力的浸渍之后。也可以通过浸渍,特别是通过使用多次浸渍,将鞘的材料沉积在纱线上。
在一个特定的实施方案中,鞘可以包含多个叠加层,这些叠加层例如通过依次挤压或者实际上通过共挤压获得。内层与增强纱线接触,为增强纱线提供保护,并且例如包括阻挡紫外线辐射的填料。外层可以掺入颜料,该颜料可以用于遮盖鞘的内层,特别是当鞘的内层是黑色或深色时。鞘的外层与半透明或透明膜相容,增强纱网与该膜成一体。特别地,外层的软化点可以低于内层的软化点,使得内层可以在需要软化鞘外层的组装网和膜的操作过程中保持附着力。显然,本发明还包括其中鞘由两个以上不同层构成的解决方案。
在另一个实施方案中,透明或半透明膜可以包含多个叠加层,特别是与纱网接触的层,该层的软化温度低于其它层的软化温度。以这种方式,当膜在其与纱网组装期间被加热时,仅一部分厚度的膜被软化,并且膜的剩余部分在组装期间变形很小或根本不变形。
在特定情况下,具有多层鞘的纱线的使用可以与也是多层的膜结合,其中各自的面层是在纱网和膜的组装期间软化的材料,而其他层不软化并保持其初始尺寸特性。
可以设想其他技术以便用保护增强纱线免受外部光影响的鞘覆盖增强纱线。因此,根据本发明的第二个实施方案,所述鞘由覆盖增强纱线的细长元件(纱线或带)组成,在其上形成通过缠绕沉积的螺旋。在一个更复杂的实施方案中,鞘可以由两个缠绕方向彼此不同的缠绕物组成。也可以通过编结操作来覆盖纱线。
有利地,可以用阻挡全部或部分紫外线辐射的材料的带进行缠绕或编结。
有利地,增强层和聚合物膜共层压在一起。
有利地,所述聚合物膜选自单独或作为混合物使用的以下材料:聚偏二氟乙烯(也称为PVDF),或基于四氟乙烯、六氟丙烯和偏二氟乙烯的聚合物(也称为THV)、氟化乙丙烯(FEP)、全氟烷氧基(PFA)和总之,许多氟化聚合物以及氟化丙烯酸和氟化甲基丙烯酸。
附图说明
从以下通过非限制性指示的方式并借助于附图对各种实施方案的描述中,实施本发明的方式及其优点将变得显而易见,其中:
图1:是构成本发明第一个实施方案的柔性片材的透视图;和
图2:是构成根据本发明的第二个实施方案的柔性片材的横截面;和
图3:是可构成本发明第二个实施方案的纺织织物的俯视图。
具体实施方式
本发明涉及复合柔性材料领域。更具体地,本发明涉及复合柔性片材。该复合柔性片材一方面由聚合物膜1,和另一方面由与聚合物膜1成一体的织物增强层2组成。
通常平坦的聚合物膜1有利地是半透明或透明的。事实上,其透光率有利地大于80%,更有利地大于90%。它由聚合物材料组成,聚合物材料有利地是氟化的,例如PVDF或THV。
聚合物膜1的厚度在50至500μm的范围内,更有利的接近200μm。它具有上表面10和下表面11,该上表面10被配置成抵抗恶劣天气,特别是通过对液态水不可渗透。
根据图1所示的本发明的第一个实施方案,所述复合片材由聚合物膜1组成,该聚合物膜1通过其下表面11与织物格栅2成为一体。
该织物格栅2由相互垂直叠加的两个相同的网构成,并由相互平行的增强纱线4构成。增强纱线4以使得在横向于每个网的平面中每厘米具有几根纱线的方式布置。以这种方式,通过所述柔性片材的自然光透射率大于45%。
每根增强纱线4基本上是圆柱形的,并且包含芯41,该芯有利地由KURARAY销售纱线组成,并且线密度为400至3000dtex,有利地线密度为1600至1700dtex,并且更有利地线密度为1670dtex。在一种变体中,芯可以用由TORAY销售的纱线生产。
鞘40围绕每根增强纱线4。在一个实施方案中,它由用炭黑颜料着色成黑色的聚偏二氟乙烯(PVDF)共聚物构成。有利地,鞘40以阻挡或至少基本上限制任何光辐射、尤其是紫外线辐射的穿透的方式完全包封每根增强纱线4。可以使用其他抗UV剂或各种有色颜料来提供UV辐射阻挡效果并保护纱线4。可以引用的满足该功能的其他材料的例子是氧化锌、二氧化钛、苯并三唑或羟苯基三嗪。
有利地,该鞘40通过围绕芯41挤出的方法直接获得。它因此与芯41在机械上成一体,并以均匀的方式覆盖其整个圆周。纱线芯的预先浸渍,例如基于聚氨酯或实际上基于PVDF乳液,可能是有用的,以确保鞘的材料在纱线芯上的良好抓力。
鞘40也可以由PVDF等组成的带的至少一种缠绕物形成,所述带优选借助炭黑颜料着色成黑色,绕鞘40螺旋缠绕。该缠绕物覆盖芯41的整个表面。
最后,每根增强纱线4的总直径在0.8至1mm的范围内,并且有利地接近0.9mm。每根增强纱线4的线密度在9500至10000dtex的范围内,有利地接近9900dtex。当置于张力下时,增强纱线4允许所述复合片材被拉伸,因此可以生产不透液态水或任何其他形式的降水的屋顶材料。
织物格栅2通过鞘40与所述聚合物膜1成一体。事实上,其与聚合物膜10的下表面11局部熔合。因此,织物格栅2机械地结合至聚合物膜1,这有利地意味着可以增强复合片材的机械强度。
根据本发明的第二个实施方案,如图2所示,织物增强层有利地采用纺织织物3的形式,其由与本发明第一个实施方案中存在的那些高强力纱线相同的高强力纱线4组成。
纺织织物3的性质可以变化。例如,如图3所示,高强力纱线4形成有孔组织,其中经纱和纬纱被分组为子组件,因此形成经纱束42和纬纱束43。束42、43中的每一种由以2.5根纱线/cm的量分布在所述柔性片材的平面中的三根高强度纱线4组成。
以此方式,纺织织物3具有由经纱束42和纬纱束43之间的交叉形成的孔区44,其有利地使得自然光能够穿过所述纺织织物3,并因此限制了织物结构对穿过所述柔性片材的透光率的影响。
在图3所示的形式中,形成经纱束42和纬纱束43的高强力线4交织在一起以形成仿亚麻组织。
在未示出的变型中,经纱束和纬纱束中包含的高强力纱线组成纱罗组织可以是有利的。这种类型的组织限制或甚至阻止了纱线束中高强力纱线的位移,这为纺织织物提供了稳定性,并为其提供了对其它操作增强的抵抗力,特别是在与膜组装之前。
事实上,这些工作负载导致纤维机械性能的降低。申请人已经观察到,在如在标准ASTM D4851中所定义的测量折叠后施加载荷后断裂的纤维数的测试期间,纱线的机械性能比玻璃纱线的劣化小得多,因此它有利地用于生产芯41。总之,该测试包括制作有5cm宽的待测材料带的环。该带由直径为90mm、宽100mm的辊压紧,以便以10秒内10次的速度重复压平环。然后将带再次压平,并以常规方式测量其拉伸断裂强度。以这种方式进行的测试显示强度降低几乎为零,在所有情况下都小于5%或甚至10%,例如与具有玻璃增强纱线的类似材料的强度降低大约20%相比。
显然,本发明还包括其中增强纱线由具有高抗折叠循环性和高拉伸断裂强度的材料制成的变型。此外,通过选择软化温度低于300℃或甚至320℃的那些氟化聚合物,其它氟化聚合物可用于膜和增强纱线的鞘,所述软化温度对应于增强纱线的降解温度,在将纱网与膜一体化的操作过程中不应超过该温度。
因此,本发明具有提供具有非常高透光率的膜的优点,因为使用了非常强的增强纱线,因此纱线可以相对于彼此间隔开。这种良好的透射率与优异的抗折叠性相结合,这意味着可以形成大尺寸的部件,通过折叠它们容易运输,而在展开后基本上不改变机械和视觉特性。使用低密度纱线(大约1.4)意味着可以在垂直位置和水平位置展开大跨度的这些膜。因此,这种膜完全适用于建筑结构屋顶材料或立面元件的生产,甚至适用于自支撑充气型结构。
Claims (10)
1.一种半透明或透明的复合柔性片材,其透光率大于45%,其包含:
-至少一个增强层(2,3),其包含高强力纱线(4);和
-对可见光半透明或透明的氟化聚合物膜(1),其与所述增强层(2,3)成一体;
所述柔性片材的特征在于,增强层(2,3)是包含高强力纱线(4)的织物,所述高强力纱线(4)基于杨氏模量大于50GPa的芳族嵌段聚酯,所述纱线具有阻挡紫外线辐射的材料的鞘(40),在根据标准ASTM D4851进行折叠测试后,所述柔性片材拉伸断裂强度的降低小于10%。
2.如权利要求1所述的柔性片材,其特征在于所述织物是格栅。
3.如权利要求1或权利要求2所述的柔性片材,其特征在于其对液态水不可渗透。
4.如权利要求1至3中的一项所述的柔性片材,其特征在于所述鞘(40)以连续的方式包裹所述高强力纱线。
5.如权利要求4所述的柔性片材,其特征在于所述鞘由至少两个叠加层形成。
6.如权利要求1至3中的一项所述的柔性片材,其特征在于所述鞘由缠绕物组成。
7.如权利要求5所述的柔性片材,其特征在于所述鞘由两个缠绕方向彼此不同的缠绕物组成。
8.如权利要求5至6中的一项所述的柔性片材,其特征在于所述缠绕物是阻挡紫外线辐射的材料的带。
9.如权利要求1至7中的一项所述的柔性片材,其特征在于所述至少一个增强层(2,3)和所述聚合物膜(1)共层压在一起。
10.如权利要求1至8中的一项所述的柔性片材,其特征在于所述氟化聚合物膜(1)选自以下材料:
-聚偏二氟乙烯(PVDF),
-基于四氟乙烯、六氟丙烯和偏二氟乙烯的聚合物(THV)。
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US4452848A (en) * | 1983-08-29 | 1984-06-05 | Geiger David H | Composite roof membrane |
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