CN109073085B - 密封材 - Google Patents
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Abstract
本发明提供一种密封材,其保持机械强度的同时,具有即使在残酷的条件下被使用的施工机械中也能够使用的耐磨性。该密封材是由含有下述(1)和(2)且还含有(3)或(4)的氟树脂组合物构成的密封材。(1)氟树脂、(2)青铜、(3)四氧化三钴、(4)含有钴和铝,且还含有从由铬、钛、镁、钙、锂组成的组中所选择的任意一种以上的金属的复合金属氧化物。优选所述氟树脂是聚四氟乙烯。另外,所述密封材能够用于施工机械。
Description
技术领域
本发明涉及一种密封材。
背景技术
液压破碎锤作为液压挖掘机的附件被安装,其通过使凿杆(chisel)(仅杆)连续地进行撞击,而被用于铺装路面、混凝土结构物的解体、岩块的敲碎、岩盘的掘凿等。图1中示出了安装液压破碎锤2来作为液压挖掘机1的附件的状况。
液压破碎锤2具有气缸和活塞,活塞和气缸以高速进行相对的往复移动,使安装于活塞顶端的凿杆以高速往复运动。在液压破碎锤2内的活塞与气缸之间的环状间隙设置有对油液等进行密封的密封件。
图2中示出了液压破碎锤2的内部结构的概略图。液压破碎锤2具有:筒状的气缸10,其具有轴孔;和活塞11,其以与轴孔的内周面具有空隙(微小间隙)的方式插入到该气缸10的轴孔内。在活塞11的顶端安装有用于粉碎混凝土、岩盘的凿杆12。
在气缸10的后端侧,以同轴的方式固定有有底筒状的后盖(backhead)。在该后盖组装有油液的取出口、气体的进气阀,在其内部填充有氮气。
为了对液压破碎锤2的设置于气缸10的轴孔与活塞11之间的环状间隙进行密封,而在后端侧和顶端侧分别设置有第一密封系统4和第二密封系统3,并设置有密封件。油液被封在第一密封系统4与第二密封系统3之间。第一密封系统4防止该油液的泄漏,并且具有防止上述的氮气泄漏的作用。另外,第二密封系统3防止油液的泄漏,并且具有防止灰尘从外部侵入的作用。密封护圈(seal retainer)5为了固定密封件而设置在第一密封系统4。
在如上那样构成的液压破碎锤2中,通过液压和气压,使桩子状的凿杆12与活塞11一起以高速沿轴向往复移动6,来将凿杆12的顶端撞击在破坏对象(混凝土、岩盘等)上,从而能够粉碎破坏对象。
由于设置于上述液压破碎锤2内的第一密封系统4与第二密封系统3之间的密封件在严重的灰尘环境下暴露在高压且高速的激烈的往复运动中,因此,密封件的破损、磨损等相当严重。
以往,使用填充了青铜和碳黑等的氟树脂组合物作为通常的施工用机械的密封件。该氟树脂组合物在使用于通常的施工机械时具有足够的强度和耐磨性。但是,在上述那样的液压破碎锤用密封件等的用途中,密封件被暴露在与通常的施工机械用途相比极为残酷的条件(高压且高速的工作条件)下,因此,希望进一步提高耐磨性。
例如,在专利文献1中公开了一种用于建筑机械等的液压驱动用气缸的密闭装置(活塞密封护圈)。该密闭装置具有由抵接于活塞的外周面的环状部件(内周部件)和抵接于气缸的内周面的环状部件(外周部件)构成的双层环状结构。并且,环状部件的一方是含有填充剂的聚四氟乙烯树脂制环状部件,另一方是橡胶制环状部件,其中,填充剂包含比聚四氟乙烯硬的成分。
【现有技术文献】
【专利文献】
专利文献1:日本发明专利授权公报特许第4894107号
发明内容
【发明所要解决的技术问题】
然而,专利文献1所记载的密闭装置针对上述目的不能说具有足够的耐磨性,还具有进一步改良的余地。
本发明是鉴于上述状况而创作出的。即,本发明的课题在于,提供一种密封材,其在保持机械强度的同时,具有即使在残酷的条件下被使用的施工机械中也能够使用的耐磨性。
【用于解决技术问题的技术方案】
本发明的发明者们对以氟树脂为基底树脂且含有青铜并用于使耐磨性进一步提高的成分进行了反复研究。其结果,发现钴类的特定金属氧化物或含有钴和铝的特定的复合金属氧化物在保持机械强度的同时,具有优异的耐磨性提高效果,从而能够实现本发明。
即,本发明的密封材是由含有下述(1)和(2)且还含有(3)或(4)的氟树脂组合物构成的密封材。
(1)氟树脂、(2)青铜、(3)四氧化三钴、(4)含有钴和铝,且还含有从由铬、钛、镁、钙、锂组成的组中所选择的任意一种以上的金属的复合金属氧化物。
另外,优选所述氟树脂是聚四氟乙烯。另外,本发明的密封材是能够用于施工机械的密封材。
下面,将“含有钴和铝,且还含有从由铬、钛、镁、钙、锂组成的组中所选择的任意一种以上的金属的复合金属氧化物”记载为“钴铝类复合金属氧化物”。
【发明效果】
本发明的密封材在保持机械强度的同时,具有即使在残酷的条件下被使用的施工机械中也能够使用的耐磨性。
附图说明
图1是表示安装有液压破碎锤的液压挖掘机的示意性的简图。
图2是液压破碎锤的内部结构的概略图。
图3是表示实施例和比较例的磨损量的图表。
具体实施方式
下面,对本发明的实施方式详细地进行说明。但是,本发明的范围并不限于下面所要说明的实施方式。
本发明的密封材以氟树脂为基底树脂,并含有青铜、和四氧化三钴或钴铝类复合金属氧化物。
氟树脂具有优异的耐热性、耐磨性、自润滑性和机械强度,且具有作为密封用材料的基本特性。在氟树脂中,有聚四氟乙烯(PTFE)、四氟乙烯-全氟烷基乙烯基醚共聚物(PFA)、四氟乙烯-六氟丙烯共聚物(FEP)、四氟乙烯-乙烯共聚物(ETFE)、聚偏二氟乙烯(PVDF)、聚三氟氯乙烯(PCTFE)、三氟氯乙烯-乙烯共聚物(ECTFE)等种类。在这些种类中,基于具有更优异的耐热性、自润滑性的特点,优选聚四氟乙烯、四氟乙烯-全氟烷基乙烯基醚共聚物、四氟乙烯-六氟丙烯共聚物,更优选聚四氟乙烯。
青铜是铜和锡的合金(英文是bronze)。青铜具有优异的延展性,因此,通过将其微粒子添加到氟树脂中,而能够赋予氟树脂耐磨性、滑动特性和耐热性。优选青铜对氟树脂添加10~70质量%,更优选添加30~50质量%。青铜以微粒子的形式添加。优选青铜的平均粒径为5~80μm,更优选20~60μm。此外,平均粒径可以通过激光衍射型粒度分布测量装置等来测量。
作为能够添加到由氟树脂和青铜构成的组合物中从而使之保持机械强度且提高耐磨性的添加剂,本发明的发明者们集中研究了金属氧化物类的微粒子。其结果,发现四氧化三钴和钴铝类复合金属氧化物具有优异的耐磨性提高效果。四氧化三钴和钴铝类复合金属氧化物可以分别单独地添加,也可以同时添加两者。
四氧化三钴是包含二价钴(II)和三价钴(III)这两者的混合价化合物。四氧化三钴的微粒子被推定为与青铜的微粒子一起分散到氟树脂中,从而有利于提高耐磨性和滑动特性。优选四氧化三钴对氟树脂添加0.1~5.0质量%,更优选添加0.5~2.0质量%。四氧化三钴以微粒子形式添加。优选四氧化三钴的平均粒径是0.1~10μm。
钴铝类复合金属氧化物是以钴和铝为必需的金属元素,且还含有从由铬、钛、镁、钙、锂组成的组中所选择的任意一种以上的金属元素的复合金属氧化物。该金属氧化物的微粒子被推定为与青铜的微粒子一起分散到氟树脂中,从而有利于提高耐磨性和滑动特性。优选钴铝类复合金属氧化物对氟树脂添加0.1~5.0质量%,更优选添加0.5~2.0质量%。钴铝类复合金属氧化物以微粒子形式添加。优选钴铝类复合金属氧化物的平均粒径是0.1~10μm。
将青铜的微粒子和四氧化三钴的微粒子或钴铝类复合金属氧化物的微粒子添加到氟树脂中来制造氟树脂组合物的方法没有特别限定,可以适用公知的混合方法。另外,还可以根据需要,在不损害本发明的目的的范围内将无机填料、有机填料、分散剂、防氧化剂、热稳定剂等现有技术中公知的各种添加剂适当地混合到氟树脂组合物中。
将含有青铜、和四氧化三钴或钴铝类复合金属氧化物的氟树脂组合物成型为密封形状的方法没有特别限定,可以使用公知的成型方法。
实施例
下面,示出实施例来进行说明,但是本发明不受这些实施例的限制。在实施例、比较例中所使用的原材料如下所示。
(1)聚四氟乙烯:旭硝子(株)制Fuluon G-163
(2)青铜:福田金属箔粉工业(株)制Bro-At-200、平均粒径35μm
(3)添加剂:
(i)四氧化三钴:伊势化学工业(株)制、四氧化三钴
(ii)CoAl2O4/Co(Al、Cr)2O4:Ferro社制、PS22-5095PK、含有少量的Ti、Mg、Ca。
(iii)CoAl2O4/Li2O/TiO2:东灌材料科技(株)制、42-211A
(iv)Co(Al、Cr)2O4:东灌材料科技(株)制、42-204A
(v)CoAl2O4:东灌材料科技(株)制、42-250A
(vi)CoCO3:日本化学产业(株)制、碳酸钴
(vii)Al2O3:住友化学(株)制、AL-41-01
(viii)碳黑:三菱化学(株)制、#20
(实施例1~4、比较例1~4)
使用亨舍尔搅拌机将聚四氟乙烯、青铜、添加剂以聚四氟乙烯/青铜/添加剂=59.5/40.0/0.5(质量%)的比率按照表1所记载的各种粉体成分进行混合,从而制作出各种粉体混合物。使用100t压力机(压力69MPa、压力保持时间135秒)对所得到的粉体混合物进行压缩成型,之后在375℃下烧制3.0~3.5小时,从而制作出各种氟树脂组合物的密封件(厚度2mm)。
使用所得到的氟树脂组合物密封件来对下面所记载的事项进行了评价。
(拉伸强度、断裂伸长率)
依据JIS K 6891:1995,对拉伸强度、断裂伸长率进行了测量。
(磨损量)
依据JIS K 7218:1986,对磨损量进行了测量。
表面压力:6MPa、圆周速度:2m/s、温度:R.T.、试验时间:8hr比较材料:碳钢S45C(表面的十点平均粗糙度Rz:1.5μm)+镀铬、无润滑
[表1]
表1中示出了评价结果。图3是表示表1所记载的实施例1~4和比较例1~4的磨损量的图表。
比较例4是相当于实际用于施工机械的密封材的氟树脂组合物。由实施例1~4和比较例1~4的结果可以看出通过添加金属化合物来代替碳黑,而使得磨损量下降、耐磨性上升的倾向。在金属化合物中的比较中,如比较例3所示,仅通过铝的金属氧化物,耐磨性的改良效果略差。
另外,如比较例2所示,即使是钴金属,在碳酸钴中,机械强度低下。这可以认为是由于在烧制过程中碳酸钴分解、脱炭酸,而在材料内产生许多空隙,十分不利于保持机械强度。另外,在比较例1的CoAl2O4中,虽然耐磨性提高了,但是可以看出机械强度下降了。
另一方面,实施例2~4通过添加钴铝类复合金属氧化物,而能够保持机械强度的同时,确认耐磨性得到改良。另外,如实施例1所示,通过添加四氧化三钴,而能够保持机械强度的同时,确认了特别大幅度的耐磨性改良效果。
【附图标记说明】
1:液压挖掘机;2:液压破碎锤。
Claims (4)
1.一种密封材,其由含有下述(1)和(2)且还含有(3)或(4)的氟树脂组合物构成,
(1)氟树脂
(2)青铜
(3)平均粒径为0.1~10μm的四氧化三钴
(4)含有钴和铝,且还含有从由铬、钛、镁、钙、锂组成的组中所选择的任意一种以上的金属且平均粒径为0.1~10μm的复合金属氧化物。
2.根据权利要求1所述的密封材,其特征在于,
对所述氟树脂添加有0.1~5.0质量%的所述四氧化三钴,或者添加有0.1~5.0质量%的所述复合金属氧化物。
3.根据权利要求1或2所述的密封材,其特征在于,
所述氟树脂是聚四氟乙烯。
4.根据权利要求1或2所述的密封材,其特征在于,
所述密封材为施工机械用密封材。
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