CN108099330A - 一种碳纤维预浸带及其制备方法 - Google Patents
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Abstract
本发明提供一种碳纤维预浸带及其制备方法,包括如下步骤:选用常规的碳纤维预浸料和网格布作为原料;对网格布进行化学改性处理,使其表面含有一定数量的化学活性基团;将改性处理后的网格布与碳纤维预浸料一起卷到辊上施加压力,使网格布中的纤维一半周长被碳纤维预浸料中的树脂浸润。本发明的碳纤维预浸带在应用于预浸料叠层时孔隙率低,同时层间剪切强度高,在风电叶片大梁中的应用具有良好效果。
Description
技术领域
本发明涉及一种碳纤维预浸带及其制备方法,尤其涉及一种适用于制造大壁厚低孔隙率复合材料的碳纤维预浸带的制备方法。
背景技术
碳纤维是新一代增强材料,具有良好的力学性能,耐腐蚀性、耐高温性能良好,在有机溶剂、酸、碱中不溶不胀。
在实际应用中,碳纤维常常用作增强纤维,碳纤维增强复合材料用途广泛,具有高强度、高刚性与质量轻的特性,提供高的比强度、比刚性,以增加相对产品的结构强度,减轻重量提升其实用性,与其它增强材料相比,杨氏模量是玻璃纤维的3倍以上、是芳纶的2倍左右;碳纤维树脂复合材料抗拉强度一般可达到钢的7~9倍,比强度是钢的几十倍,比模量也比钢更高。目前碳纤维增强材料已经广泛应用于航空航天、电子通讯、车辆舰船、医疗器械等军工或民用众多领域,诸如:风电大梁、汽车车架、大型游艇等皆有使用碳纤维增强树脂复合材料。
目前碳纤维的实际使用过程中,70%以上是通过碳纤维预浸料的方式实现,尤其应用于风电叶片中,碳纤维大梁是风电叶片的重要组成部件,可通过层铺碳纤维预浸料的方式获得,但一般的碳纤维预浸料在铺层时,层间比较松懈,孔隙率高,在碳纤维大梁的这样的高应力部件中,孔隙率高是一个降低机械性能的缺陷点,因此急需一种能够降低层间孔隙率的碳纤维预浸料的制备方法。
发明内容
为解决上述技术问题,本发明提供一种碳纤维预浸带及其制备方法,在应用于预浸料叠层时孔隙率低,同时层间剪切强度高。
本发明采用如下技术方案:
一种碳纤维预浸带的制备方法,包括如下步骤:
S1、选用常规的碳纤维预浸料和网格布作为原料;
S2、对网格布进行化学改性处理,使其表面含有一定数量的化学活性基团;
S3、将步骤S2中的网格布与碳纤维预浸料一起卷到辊上施加压力,使网格布中的纤维一半周长被碳纤维预浸料中的树脂浸润。
优选的,步骤S1中的所述碳纤维预浸料由碳纤维和热固性树脂形成,所述碳纤维为单向排列或织物形式,所述碳纤维预浸料的克重为150~600g/m2;所述网格布由聚酯纤维形成,所述聚酯纤维直径为20~50μm,所述聚酯纤维的股间距为20~100mm。
优选的,步骤S2中对网格布进行化学改性处理的具体方法为,将所述网格布浸渍于表面处理剂中,经过1~10min的浸渍处理后进入烘箱烘干,烘干时间为1~10min。
优选的,所述表面处理剂包括以下质量份数的组分:
环氧树脂50~80份;
浸润剂0.1~1份;
稀释剂20~80份;
固化剂30~80份。
优选的,所述环氧树脂为双酚A型环氧树脂和双酚F型环氧树脂中的一种或两种的组合,优选为单一的双酚A型环氧树脂。
优选的,所述浸润剂为蓖麻油聚氧乙烯醚。
优选的,所述稀释剂为乙醇和丙酮中的一种。
优选的,所述固化剂为酸酐类固化剂和胺类固化剂中的一种或两种的组合,优选为甲基四氢邻苯二甲酸酐和聚醚胺按比例为1:1~10:1的方式混合。
优选的,所述表面处理剂的制备方法为,按质量份数选取各原料,采用物理搅拌混合的方法制备,搅拌速度为300~500r/min,搅拌时间为5~15min。
本发明还公开了一种碳纤维预浸带,包括由上述制备方法制备的碳纤维预浸带,所述碳纤维预浸带上还设有外保护膜,所述外保护膜与所述网格布分别设置于所述碳纤维预浸料的两侧,所述外保护膜为具有明显警示作用颜色的PE膜。
本发明的有益效果:
(1)在碳纤维预浸料在铺层过程中,聚酯纤维网格布可以起到疏散预浸带层间空气,降低复合材料制品孔隙率的作用;
(2)聚酯纤维网格布表面的化学活性基团在预浸料的固化过程中参与固化反应,碳纤维复合材料层合板的层间剪切强度得到提高;
(3)碳纤维预浸料与网格布的复合过程是在预浸带的生产过程中在线完成的,工艺简单,加工方便;
(4)本发明的碳纤维预浸带可以用于大壁厚多铺层碳纤维复合材料构件的成型,其在风电叶片大梁中的应用可以取得良好效果。
具体实施方式
本发明的原理,是通过对网格布进行化学改性处理,使其表面含有一定数量的化学活性基团,再将网格布附着在碳纤维预浸料中,网格布表面的化学活性基团在预浸料的固化过程中参与固化反应,碳纤维复合材料层合板的层间剪切强度得到提高,同时由于网格布的存在,在碳纤维预浸料在铺层过程中,聚酯纤维网格布可以起到疏散预浸带层间空气,降低复合材料制品孔隙率的作用。
以下通过具体实施例对本发明作进一步解释。
实施例1
本实施例1制备的碳纤维预浸带,采用常规的碳纤维预浸料和聚酯纤维网格布作为原料,先将聚酯纤维网格布浸渍于表面处理剂中,经过1~10min的浸渍处理后进入烘箱烘干,烘干时间为1~10min,然后将碳纤维预浸料卷放在直径200~400mm料筒上,在碳纤维预浸料收卷前将改性处理的聚酯纤维网格布铺放于碳纤维预浸料上,通过压辊的高低控制使聚酯纤维网格布中的纤维一半周长被碳纤维预浸料中的树脂浸润,在120℃/2h的条件下固化后既得本实施例1的碳纤维预浸带;
其中,表面处理剂由以下质量份数的组分组成:双酚A型环氧树脂20份、双酚F型环氧树脂30份、蓖麻油聚氧乙烯醚1份、乙醇80份、甲基四氢邻苯二甲酸酐30份;按质量份数选取各原料,采用物理搅拌混合的方法制备,搅拌速度为300~500r/min,搅拌时间为5~15min。
实施例2
本实施例2制备的碳纤维预浸带与实施例1制备方法相同,区别在于表面处理剂的成分,本实施例2的表面处理剂由以下质量份数的组分组成:双酚A型环氧树脂80份、蓖麻油聚氧乙烯醚0.1份、丙酮20份、甲基四氢邻苯二甲酸酐70份、聚醚胺7份。
实施例3
本实施例3制备的碳纤维预浸带与实施例1制备方法相同,区别在于表面处理剂的成分,本实施例3的表面处理剂由以下质量份数的组分组成:双酚A型环氧树脂65份、蓖麻油聚氧乙烯醚0.5份、乙醇50份、甲基四氢邻苯二甲酸酐50份、聚醚胺10份。
实施例4
本实施例4制备的碳纤维预浸带与实施例1制备方法相同,区别在于表面处理剂的成分,本实施例4的表面处理剂由以下质量份数的组分组成:双酚A型环氧树脂50份、蓖麻油聚氧乙烯醚0.5份、乙醇50份、甲基四氢邻苯二甲酸酐25份、聚醚胺25份。
对比例1
本对比例1采用真空袋压成型制备的未经过表面处理网格布的预浸料成型的单向复合材料。
实施例1~4以及对比例1的力学性能对比如下表1所示:
表1
由表1可知,采用本发明方法制备的经过表面处理网格布的碳纤维预浸带具有优异的力学性能,可以用于大壁厚多铺层碳纤维复合材料构件的成型,特别适用于风电叶片大梁,具有孔隙率低、层间剪切强度高等优点。
以上所述仅为本发明的优选实施例而已,并不用于限制本发明,尽管参照前述实施例对本发明进行了详细的说明,对于本领域的技术人员来说,其依然可以对前述各实施例所记载的技术方案进行修改,或者对其中部分技术特征进行等同替换。凡在本发明的精神和原则之内,所作的任何修改、等同替换、改进等,均应包含在本发明的保护范围之内。
Claims (10)
1.一种碳纤维预浸带的制备方法,其特征在于,包括如下步骤:
S1、选用常规的碳纤维预浸料和网格布作为原料;
S2、对网格布进行化学改性处理,使其表面含有一定数量的化学活性基团;
S3、将步骤S2中的网格布与碳纤维预浸料一起卷到辊上施加压力,使网格布中的纤维一半周长被碳纤维预浸料中的树脂浸润。
2.根据权利要求1所述的一种碳纤维预浸带的制备方法,其特征在于,步骤S1中的所述碳纤维预浸料由碳纤维和热固性树脂形成,所述碳纤维为单向排列或织物形式,所述碳纤维预浸料的克重为150~600g/m2;所述网格布由聚酯纤维形成,所述聚酯纤维直径为20~50μm,所述聚酯纤维的股间距为20~100mm。
3.根据权利要求1所述的一种碳纤维预浸带的制备方法,其特征在于,步骤S2中对网格布进行化学改性处理的具体方法为,将所述网格布浸渍于表面处理剂中,经过1~10min的浸渍处理后进入烘箱烘干,烘干时间为1~10min。
4.根据权利要求3所述的一种碳纤维预浸带的制备方法,其特征在于,所述表面处理剂包括以下质量份数的组分:
环氧树脂 50~80份;
浸润剂 0.1~1份;
稀释剂 20~80份;
固化剂 30~80份。
5.根据权利要求4所述的一种碳纤维预浸带的制备方法,其特征在于,所述环氧树脂为双酚A型环氧树脂和双酚F型环氧树脂中的一种或两种的组合,优选为单一的双酚A型环氧树脂。
6.根据权利要求4所述的一种碳纤维预浸带的制备方法,其特征在于,所述浸润剂为蓖麻油聚氧乙烯醚。
7.根据权利要求4所述的一种碳纤维预浸带的制备方法,其特征在于,所述稀释剂为乙醇和丙酮中的一种。
8.根据权利要求4所述的一种碳纤维预浸带的制备方法,其特征在于,所述固化剂为酸酐类固化剂和胺类固化剂中的一种或两种的组合,优选为甲基四氢邻苯二甲酸酐和聚醚胺按比例为1:1~10:1的方式混合。
9.根据权利要求4至8中任一项所述的一种碳纤维预浸带的制备方法,其特征在于,所述表面处理剂的制备方法为,按质量份数选取各原料,采用物理搅拌混合的方法制备,搅拌速度为300~500r/min,搅拌时间为5~15min。
10.一种碳纤维预浸带,其特征在于,包括由上述制备方法制备的碳纤维预浸带,所述碳纤维预浸带上还设有外保护膜,所述外保护膜与所述网格布分别设置于所述碳纤维预浸料的两侧,所述外保护膜为具有明显警示作用颜色的PE膜。
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