CN107379700A - 离型纸、其制造方法和使用离型纸制造膜电极组件的方法 - Google Patents
离型纸、其制造方法和使用离型纸制造膜电极组件的方法 Download PDFInfo
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Abstract
一种离型纸、其制造方法和使用离型纸制造膜电极组件的方法。用于制造膜电极组件的离型纸包括由具有离型性的材料形成的一个或多个第一膜,以及结合至第一膜并且拉伸强度高于第一膜的拉伸强度的第二膜。第一膜由具有非粘合性和离型性的聚四氟乙烯(PTFE)形成。
Description
技术领域
本发明涉及离型纸,且更具体地,涉及一种能够使电极牢固地接触电解质膜、并且即使在低温低压条件下也能够通过辊压机容易地连续制造膜电极组件的离型纸、其制造方法以及使用离型纸制造膜电极组件的方法。
背景技术
燃料电池是将氢或甲醇、乙醇或天然气等烃类物质中所含的氢和氧的化学反应能直接转化为电能的发电系统。这种燃料电池分类为磷酸燃料电池、熔融碳酸盐燃料电池、固体氧化物燃料电池和聚合物电解质或碱性燃料电池。燃料电池基本上由相同的原理操作,但是燃料的类型、工作温度、催化剂和电解质不同。
在燃料电池中实质上产生电力的燃料电池堆通常具有多个或数十个包括膜电极组件和隔板(或双极板)的单元电池堆叠的结构。
膜电极组件可包括电解质膜以及附着于电解质膜的两面的阳极电极(也称为燃料电极或氧化电极)和阴极电极(也称为空气电极或还原电极)。
以下将说明制造膜电极组件的过程。通过在离型纸的表面上涂覆电极并通过施加热和压力将电极结合至电解质膜的两面来组装膜电极组件。
同时,当电极涂覆在离型纸的表面上时,电极中的更多粘合剂可分布在离型纸的表面上,并且当电极结合至电解质膜时由于分布在离型纸的表面上的粘合剂牵拉电极,所以会难以制造膜电极组件。因此,如果将膜电极结合条件设定为高温和高压以提高离型性,则可平顺地转印电极,但是由于对材料的损坏,会使性能降低。
当转印电极时,可使用PTFE膜等具有离型性和非粘合性的材料作为离型纸,以提高离型性。因为PTFE膜由于优异的离型性而使电极容易转印,所以可减小对材料的损伤,并可防止性能的降低。
以这种方式,当PTFE膜用作离型纸时,可在电极转印的同时提高离型性,但是由于PTFE膜的价格高,所以难以将PTFE膜应用于实际的制造过程。此外,由于PTFE膜的拉伸强度较低,所以难以将PTFE膜应用于膜电极组件的连续制造过程,因此膜电极组件的生产率降低。
发明内容
本发明提供一种通过提高离型性使电极能够牢固地接触电解质膜的表面、并且通过防止离型纸进给能够连续地制造膜电极组件的离型纸,制造离型纸的方法,以及使用离型纸制造膜电极组件的方法。
本发明的技术目的不限于上述技术目的,并且从以下说明中,其他未提及的技术目的对于本领域技术人员而言将变得显而易见。
根据本发明的一方面,提供了一种用于制造膜电极组件的离型纸,该离型纸包括由具有离型性的材料形成的一个或多个第一膜,以及结合至第一膜并且拉伸强度高于第一膜的拉伸强度的第二膜。
在一个或多个第一膜中,两个第一膜可对称地堆叠在第二膜的两面上。
第一膜可由具有非粘合性和离型性的聚四氟乙烯(PTFE)形成。
第一膜可由具有多个细孔的聚四氟乙烯(PTFE)形成。
第二膜可由聚对苯二甲酸乙二酯(PET)、聚萘二甲酸乙二酯(PEN)、聚酰亚胺(PI)和聚甲醛(POM)中的任何一种形成。
第二膜可由不与有机溶剂反应的不可收缩材料形成。
第一膜和第二膜可通过使用热和压力而彼此结合。
第一膜和第二膜可通过使用粘合剂或胶而彼此结合。
粘合剂或胶可由当电极涂覆在第一膜的表面上时不与电极中的有机溶剂混合的材料形成。
粘合剂或胶可为丙烯酸、环氧树脂和硅中的至少一种。
根据本发明的另一方面,提供了一种制造离型纸的方法,该离型纸用于制造膜电极组件,该方法包括制备第一膜和拉伸强度高于第一膜的第二膜,以及通过施加热和压力将第二膜结合至第一膜。
该方法还可包括,在结合第二膜之前,在制备第一膜和第二膜之后,在第一膜与第二膜之间涂布粘合剂或胶。
根据本发明的另一方面,提供了一种制造膜电极组件的方法,该方法包括:在制备结合有第一膜和第二膜的离型纸之后,在离型纸的第一膜的表面上形成电极,第一膜具有离型性,并且第二膜的拉伸强度高于第一膜的拉伸强度;将具有电极的离型纸连续进给至一对辊压机;以及在该对辊压机之间,将离型纸的电极结合至电解质膜。
附图说明
从以下结合附图进行的详细说明中,本发明的以上和其他目的、特征和优点将更加明显:
图1是示出根据本发明的第一实施例的离型纸的截面图;
图2是示出根据本发明的第二实施例的离型纸的截面图;
图3是示出根据本发明的制造离型纸的方法的流程图;
图4是示出制造根据图1的第一实施例的离型纸的过程的视图;
图5是示出制造根据图2的第二实施例的离型纸的过程的视图;
图6是示出根据本发明的第三实施例的离型纸的截面图;
图7是示出根据本发明的第四实施例的离型纸的截面图;
图8是示出制造根据图6的第三实施例的离型纸的过程的视图;
图9是示出制造根据图7的第四实施例的离型纸的过程的视图;
图10是示出根据本发明的使用离型纸制造的膜电极组件的性能评价结果的曲线图;
图11是示出根据本发明的在离型纸上涂覆电极的过程的视图;
图12是示出根据本发明的使用离型纸制造膜电极组件的装置的示例的视图;并且
图13是示出根据本发明的使用离型纸制造膜电极组件的方法的流程图。
附图中各元件的附图标记
4:离型纸辊
5:电解质膜辊
7、7a:一对辊压机
8:电解质膜
9:膜电极组件
10:离型纸
11:第一膜
12:第二膜
13:粘合剂或胶
具体实施方式
在下文中,将参照附图详细说明本发明的示例性实施例。为了参照,附图中部件的尺寸和线的粗细可被夸大,以便于理解。此外,在本发明的说明中使用的术语考虑到在本发明中的功能,可根据使用者、操作者的意图或习惯而不同。因此,应根据本文所阐述的整体发明来定义术语。
参照图1,根据本发明的各种实施例的离型纸10可包括第一膜11和第二膜12,其中电极20涂覆在第一膜11的一个表面上,并且第一膜11结合至第二膜12的一个表面。
根据本发明的各种实施例,第一膜11可由具有非粘合性和离型性的聚四氟乙烯(PTTE)形成,因此如图12中所示,当涂覆在第一膜11的表面上的电极20转印并结合至电解质膜8时,电极20可从第一膜11容易地离型,并且因此,电极20可牢固地结合至电解质膜8。电极20可具有多个细孔。
根据另一实施例,第一膜11可由e-PTFE等具有多个细孔的通气性PTFE材料形成。以这种方式,当第一膜11由通气性PTFE材料形成时,涂覆在第一膜11的表面上的电极20的表面粗糙度可由于第一膜11的孔而增加,并且还可形成多个细孔。以这种方式,随着电极20的表面粗糙度增加,可有效地防止水分或异物附着于电极20的表面。
上述第一膜11可具有3μm至500μm的厚度。
第二膜12可通过使用热和压力而结合至第一膜11的一个表面,并且特别地,第二膜12可由具有比第一膜11高的拉伸强度的材料形成。
根据实施例,第二膜12可由聚对苯二甲酸乙二酯(PET)、聚萘二甲酸乙二酯(PEN)、聚酰亚胺(PI)和聚甲醛(POM)中的任何一种形成。
此外,优选地,第二膜12由不热收缩同时不与电极中的有机溶剂反应的材料形成。
上述第二膜12可具有25μm至200μm的厚度。
根据本发明的离型纸10,由于涂覆在离型性优异的第一膜11的表面上的电极可容易地朝向电解质膜8离型,所以可显著提高电极的结合性,由于拉伸强度高于第一膜11的拉伸强度的第二膜12与第一膜11结合的结构,所以在使用辊压机连续制造膜电极组件9的过程中进给离型纸10时,由于拉伸力引起的第一膜11的伸长可得以最小化,并且电极可稳定地涂覆在第一膜11的表面上,并可牢固地结合至电解质膜8的表面。
根据图2的实施例,第一膜11和第二膜12可使用粘合剂或胶13彼此结合,因此,第一膜11和第二膜12可以更坚固的结构彼此结合。
优选地,粘合剂或胶13由在电极涂覆在第一膜11的表面上时,不与电极中的有机溶剂混合的材料形成。
粘合剂或胶13可由丙烯酸、环氧树脂和硅中的至少一种形成。
图3示出根据本发明的各种实施例的用于膜电极组件9的离型纸10的制造方法。
如图3中所示,根据本发明的用于膜电极组件9的离型纸10的制造方法可包括制备第一膜11和第二膜12的操作S1,以及将第二膜12结合在第一膜11的一个表面上的操作S3。
在操作S1中,可制备诸如聚四氟乙烯(PTFE)的具有非粘合性和离型性的第一膜11,以及拉伸强度比第一膜11的拉伸强度高的第二膜12。
根据一个实施例,在操作S3中,可通过对第二膜12施加热和压力,将第二膜12结合至第一膜11的表面。
根据另一实施例,还可在操作S1与操作S3之间提供在第一膜11的表面与第二膜12的表面之间涂布粘合剂或胶13的操作S2,并且由于所涂布的粘合剂或胶13,可通过施加热和压力将第一膜11和第二膜12牢固地彼此结合。
图4是示出制造根据图1的实施例的离型纸10的过程的视图,并且示出在制备第一膜11和第二膜12之后,通过将第一膜11和第二膜12叠置之后施加热和压力而结合第一膜11和第二膜12的过程。
图5是示出制造根据图2的实施例的离型纸10的过程的视图,并且示出制备第一膜11和第二膜12,在将粘合剂或胶13涂布至第一膜11的表面或第二膜12的表面时叠置第一膜11和第二膜12,以及通过施加热和压力将第一膜11和第二膜12同时结合至粘合剂或胶13的两面的过程。
同时,由于具有不同特性的第一膜11和第二膜12彼此结合的结构,离型纸10可卷曲至一侧使得可能无法恒定地保持离型纸10的平坦度,因此膜电极组件9的生产率或产率可能降低。
关于这一点,根据图6的实施例的离型纸10可包括对称地堆叠在第二膜12的两侧以结合至第二膜12的两个第一膜11。以这种方式,由于通过在第二膜12的两面对称地设置第一膜11可有效地防止离型纸10卷曲至一侧,所以当制造过程进行时可稳定地保持离型纸10的平坦度。
根据图7的实施例,两个第一膜11可使用粘合剂或胶13结合至第二膜12的两面,因此,两个第一膜11可牢固地结合至第二膜12的两面。
优选地,粘合剂或胶13由当电极涂覆在第一膜11的表面上时,不与电极中的有机溶剂混合的材料形成。
粘合剂或胶13可由丙烯酸、环氧树脂和硅中的至少一种形成。
图8是示出制造根据图6的实施例的离型纸10的过程的视图,并且示出在制备两个第一膜11和第二膜12之后,将两个第一膜11对称地设置在第二膜12的两面上,并且通过施加热和压力将第一膜11结合至第二膜12的两面的过程。
图9是示出制造根据图7的实施例的离型纸10的过程的视图,并且示出制备两个第一膜11和第二膜12,在将粘合剂或胶13涂布至第一膜11的表面或第二膜12的两面时叠置第一膜11和第二膜12,以及通过施加热和压力将第一膜11和第二膜12同时结合至粘合剂或胶13的两面的过程。
图11至图13是示出使用上述离型纸10制造膜电极组件9的方法的视图。
参照图11至图13,根据制造膜电极组件9的方法,可通过在离型纸10的第一膜11的表面上形成电极20、20a(T1),将具有电极20、20a的离型纸10进给至一对辊压机7、7a之间(T2),以及通过该对辊压机7、7a将离型纸10的电极20、20a结合至电解质膜8(T3),来制造膜电极组件9。
将参照图11详细说明涂覆电极20、20a的过程T1。可通过经由涂覆机3在离型纸10的第一膜11的表面上间歇地涂覆电极20、20a,在第一膜11的表面上彼此间隔一定间隙地形成多个电极20、20a。
以这种方式,涂覆有电极20、20a的离型纸10、10a卷绕在离型纸辊4上。以这种方式,可通过使用涂覆有电极20、20a的离型纸10、10a所卷绕的离型纸辊4来制造膜电极组件9。
图12示出辊压设备的制造膜电极组件9的装置的示例,并且制造膜电极组件9的装置包括电解质膜8卷绕的电解质膜辊5,位于电解质膜辊5的相反侧的膜电极组件辊6,设置在电解质膜辊5与膜电极组件辊6之间的一对辊压机7、7a,设置在电解质膜辊5上方的上离型纸辊4,以及设置在电解质膜辊5下方的下离型纸辊4a。
当电解质膜8从电解质膜辊5展开并进给至一对辊压机7、7a时,涂覆有电极20、20a的离型纸10、10a可从上离型纸辊4和下离型纸辊4a展开,并可进给至一对辊压机7、7a(T2)。
一对辊压机7、7a可按压电解质膜8的两面,使得电极20、20a可从离型纸10、10a的第一膜11离型,以结合至电解质膜8的两面(T3)。这里,从上离型纸辊4展开的离型纸10的电极20和从下离型纸辊4a展开的离型纸10a的电极20a(阳极电极和阴极电极)的极性彼此相反。
此外,结合有电极20、20a的电解质膜8可卷绕在膜电极组件辊6上,并且电极20、20a已离型的离型纸10、10a可卷绕在回收辊2上以便回收和再利用。
以这种方式,根据本发明,由于离型纸10、10a的具有离型性的第一膜11、11a,所以电极20、20a可从离型纸10、10a容易地离型,并且由于离型纸10、10a的第二膜12、12a,所以在由辊进给离型纸10、10a时由于拉伸力引起的第一膜11的伸长可得以最小化,因此电极20、20a可稳定地涂覆在第一膜11的表面上,并且还可牢固地结合至电解质膜8的表面。
特别地,根据本发明,通过使用结合有第一膜11、11a和第二膜12、12a的离型纸10、10a,可通过辊压机7、7a进给离型纸10、10a并可非常有效地连续制造膜电极组件9,因此可显著提高膜电极组件9的生产率。
图10是示出根据本发明的使用离型纸10制造的膜电极组件9的性能评价结果的曲线图。
图10是示出在辊压机以0.2m/min的转速旋转的同时将110℃的热和70kgf的压力施加至辊压机时,与通过将从离型纸10离型的电极结合至电解质膜8而制造的膜电极组件9的电压对应的电流密度的曲线图。图10示出根据本发明制造的膜电极组件9在0.6V下具有1200mA/cm2的性能,其与通过现有方法制造的膜电极组件9的性能类似。
根据本发明,通过提高离型性,可将电极牢固地结合至电解质膜8的两面,并且通过在进给离型纸10时防止离型纸10伸长,可通过辊压设备容易地连续制造膜电极组件9。
虽然至此已说明本发明的具体实施例,但是本发明不限于说明书和附图中所公开的实施例,并且本发明可由本领域技术人员进行各种修改而不脱离本发明的技术思想。
Claims (13)
1.一种用于制造膜电极组件的离型纸,所述离型纸包括:
一个或多个第一膜,由具有离型性的材料形成;以及
第二膜,结合至所述第一膜,并且拉伸强度高于所述第一膜的拉伸强度。
2.根据权利要求1所述的离型纸,其中所述离型纸包括对称地堆叠在所述第二膜的两面上的两个第一膜。
3.根据权利要求1所述的离型纸,其中所述第一膜由具有非粘合性和离型性的聚四氟乙烯(PTFE)形成。
4.根据权利要求1所述的离型纸,其中所述第一膜由具有多个细孔的聚四氟乙烯(PTFE)形成。
5.根据权利要求1所述的离型纸,其中所述第二膜由聚对苯二甲酸乙二酯(PET)、聚萘二甲酸乙二酯(PEN)、聚酰亚胺(PI)和聚甲醛(POM)中的任何一种形成。
6.根据权利要求1所述的离型纸,其中所述第二膜由不与有机溶剂反应的不可收缩材料形成。
7.根据权利要求1所述的离型纸,其中所述第一膜和所述第二膜通过使用热和压力而彼此结合。
8.根据权利要求1所述的离型纸,其中所述第一膜和所述第二膜通过使用粘合剂或胶而彼此结合。
9.根据权利要求8所述的离型纸,其中所述粘合剂或胶由当电极涂覆在所述第一膜的表面上时不与所述电极中的有机溶剂混合的材料形成。
10.根据权利要求9所述的离型纸,其中所述粘合剂或胶是丙烯酸、环氧树脂和硅中的至少一种。
11.一种制造离型纸的方法,所述离型纸用于制造膜电极组件,所述方法包括以下步骤:
制备第一膜和第二膜,所述第二膜的拉伸强度高于所述第一膜的拉伸强度;以及
通过施加热和压力将所述第二膜结合至所述第一膜。
12.根据权利要求11所述的方法,还包括:
在将所述第二膜结合至所述第一膜的步骤之前,以及在制备所述第一膜和所述第二膜的步骤之后,在所述第一膜与所述第二膜之间涂布粘合剂或胶的步骤。
13.一种制造膜电极组件的方法,所述方法包括以下步骤:
在制备结合有第一膜和第二膜的离型纸之后,在所述离型纸的第一膜的表面上形成电极,所述第一膜具有离型性,并且所述第二膜的拉伸强度高于所述第一膜的拉伸强度;
将具有所述电极的所述离型纸连续进给至一对辊压机;以及
在所述一对辊压机之间,将所述离型纸的所述电极结合至电解质膜。
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US20070122684A1 (en) * | 2005-11-25 | 2007-05-31 | Min-Kyu Song | Membrane-electrode assembly for fuel cell, method of producing same, and fuel cell system comprising same |
CN103802419A (zh) * | 2014-02-25 | 2014-05-21 | 苏州安洁科技股份有限公司 | 超强拉伸强度复合离型材料 |
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US20070122684A1 (en) * | 2005-11-25 | 2007-05-31 | Min-Kyu Song | Membrane-electrode assembly for fuel cell, method of producing same, and fuel cell system comprising same |
CN103802419A (zh) * | 2014-02-25 | 2014-05-21 | 苏州安洁科技股份有限公司 | 超强拉伸强度复合离型材料 |
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