CN103608417A - 用于油封唇部的表面处理剂 - Google Patents

用于油封唇部的表面处理剂 Download PDF

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CN103608417A
CN103608417A CN201280029466.3A CN201280029466A CN103608417A CN 103608417 A CN103608417 A CN 103608417A CN 201280029466 A CN201280029466 A CN 201280029466A CN 103608417 A CN103608417 A CN 103608417A
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lip
surface treatment
oil sealing
treatment agent
oil seal
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国枝贤一
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Nok Corp
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Abstract

本文公开了用于油封唇部的表面处理剂，其包含润滑剂填充物和由甲苯二异氰酸酯和三甲醇丙烷加合物组成的加成化合物，将所述表面处理剂施用至形成油封唇部的硫化橡胶的表面，所述油封包含唇部和金属环。本发明的所述表面处理剂在油封的密封件唇部的滑动面上的应用，有效延长了油封用在滑动部件或移动部件中时的使用寿命，并使得使用该油封的仪器节省能量。

Description

用于油封唇部的表面处理剂
技术领域
本发明涉及用于油封唇部的表面处理剂。更具体地，本发明涉及用于油封唇部的表面处理剂，将所述表面处理剂施用至形成油封唇部的硫化橡胶的表面，所述油封包含唇部和金属环。
 
背景技术
在汽车、工业机器等领域，油封广泛地用作重要的机器部件。为移动或滑动的目的使用油封；但是，由密封件的摩擦热引起的密封油和密封材料的变质和设备中因摩擦阻力的能量损失在很多情况中导致问题。
可通过在油封唇部的滑动面上形成一种材料的涂覆膜减小油封的摩擦，所述材料的摩擦系数低于密封材料的；但是，当滑动移去涂覆膜时低摩擦效果丧失。
本申请人之前已有提议用于硫化橡胶的表面处理剂，通过各以10至160重量份的蜡和的氟树脂与100重量份的含异氰酸酯的1,2-聚丁二烯混合将所述表面处理剂制备成有机溶剂溶液，所述蜡具有在40至160oC之间的软化点。将该用于硫化橡胶的表面处理剂有效地施用至油封等。（参见专利文件1）。
 
现有技术文件
专利文件1
 专利文件1：JP-B-3893985
本发明概要
本发明要解决的技术问题
本发明的目的是提供用于油封唇部的表面处理剂，将所述表面处理剂施用至形成油封唇部的硫化橡胶的表面，所述油封包含唇部和金属环，因此将表面处理剂施用至密封件唇部的滑动面有效地延长了油封用在滑动部件或移动部件中使用时的使用寿命，并使得使用该油封的仪器节省能量。
解决问题的方法
本发明的上述目的可通过用于油封唇部的表面处理剂实现，其包括润滑油填充物和由甲苯二异氰酸酯和三甲醇丙烷加合物组成的加成化合物, 将所述表面处理剂施用至形成油封唇部的硫化橡胶的表面，所述油封包含唇部和金属环。 
本发明的效果
将根据本发明的用于油封唇部的表面处理剂施用至形成油封唇部的硫化橡胶的表面。因为甲苯二异氰酸酯和三甲醇丙烷加合物（是该表面处理剂的必要成分）具有游离异氰酸酯基，该加合物对硫化橡胶（即密封材料）具有优良的粘着性并因而与基础材料一起充当粘合剂。另外，所述表面处理剂在固化后具有高硬度，并因而具有优良的抗磨性。另外，通过固化表面处理剂获得的涂覆膜包含润滑剂填充物，并因而具有改进的抗磨性、润滑性、和蠕变阻力。 
将具有此种性质的本发明的表面处理剂施用至油封的密封件唇部的滑动面有效延长了油封用在滑动部件或移动部件中时的使用寿命，并使得使用该油封的仪器节省能量。
 
实施本发明的实施方式
将本发明的表面处理剂施用至其唇密封部分（lip-seal portion）的油封的实例包括标准油封，例如内含弹簧（spring-embedded）结合橡胶（bonded-rubber）的密封件、内含弹簧金属包装的（metal-cased）密封件、无弹簧结合橡胶的密封件、无弹簧金属包装的密封件、具有防尘唇边的内含弹簧结合橡胶的密封件、和具有防尘唇边的内含弹簧金属包装的密封件；和特殊油封，例如往复运动密封件、防污密封件、抗压密封件、双向密封件、和带套管的组合密封件（assembly seal）。
可选地，基于油封唇部的唇部形状，本发明的表面处理剂也可有效地应用至油封上（例如单唇油封、单唇(内含弹簧)的油封、双唇油封、和双重（dual）油封；和具有特定唇封的油封，例如分隔密封件（split seal）、外部密封件、和水压密封件。
此种油封的唇部由硫化橡胶制成。形成唇部的橡胶的实例包括氟橡胶、丙烯酸类橡胶、丁腈橡胶、氢化丁腈橡胶、硅橡胶等。优选地，使用氟橡胶或丙烯酸类橡胶。可使用过氧化物交联型氟橡胶和多元醇交联型的氟橡胶两者。丙烯酸类橡胶的实例包括使用各种可交联的基团（例如羧基和氯基）的那些。对于他们的硫化，基于所使用的可交联基团的类型使用硫化剂。
将包含润滑剂填充物和加成化合物作为基本成分的用于油封唇部的表面处理剂施用至硫化橡胶制成的唇部表面，具体地，施用至唇封部分的表面，所述加成化合物由甲苯二异氰酸酯和三甲醇丙烷加合物组成。
作为1摩尔三甲醇丙烷和3摩尔甲苯二异氰酸酯[TDI]的加成反应产物的加合物可以是商品，例如Desmodur L75 (由Sumika Bayer Urethane生产)，其具有如下性质：
NCO含量：13.3±0.4%
不挥发物含量：75±2%
粘度(23oC)：1600±400 mPa·s
碘色值：≤2
游离TDI含量（基于固体）：< 0.5%
当量：约315
闪点：约5oC
密度(20oC)：约1.17 g/ml
溶解度：与酯类（例如乙酸乙酯、乙酸丁酯和1-乙酸甲氧基丙基酯-2）和芳香烃（例如甲苯和二甲苯）好的相容性。
是表面处理剂的另一成分的润滑剂填充物的实例包括以PTFE树脂粉末为代表的氟树脂粉末、石墨、二硫化钼、碳化硅等；优选地使用PTFE树脂粉末、石墨、或二硫化钼。
可以任何比例使用这些基本成分。例如，通常以如下比率使用：润滑油填充物约90至15重量%，优选地约85至40重量%, 相对于约10至85重量%，优选地约15至60重量%的甲苯二异氰酸酯/三甲醇丙烷加合物。
将表面处理剂作为分散性涂覆液施用至形成唇部的硫化橡胶的表面。如上文描述地，分散性涂覆液通过例如将所述表面处理剂分散在包含在Desmodur L75中的25重量%的乙酸乙酯中来制备，或用各种酯类或芳香烃类进一步稀释所述分散体至固体含量为约1至15重量%。不能用醇作为稀释有机溶剂，因为它们与Desmodur L75反应。
可由任何方法将所述表面处理剂施用至硫化橡胶的表面，例如浸渍、喷洒、辊涂、流涂。涂覆之后，取决于形成硫化橡胶层的橡胶类型，在足以确保涂覆膜的固化和粘着热条件下，即，在约150至270oC，优选地约175至270oC的温度下，进行热处理约5分钟至约24小时。
热处理之后表面处理剂层的涂覆厚度通常设在约3至30μm，优选地约5至20μm。当涂覆厚度小于这个范围时，不能覆盖硫化橡胶的整个表面，也不能实现所需的低摩擦系数。相反地，当涂覆厚度大于这个范围时，涂覆膜表面的硬度变得较高，损坏密封性质和柔度。通过在表面处理剂中混合各种含羟基的树脂可实现涂覆膜表面的硬度的调整。
 
实施例
下列提及实施例描述本发明。
实施例1
将包含15重量%的甲苯二异氰酸酯-三甲醇丙烷加合物(Desmodur L75，由Sumika Bayer Urethane生产; TDI加合物，约75重量%乙酸乙酯溶液)和85重量%的PTFE粉末(平均粒度：1μm)的表面处理剂施用至形成油封唇部的硫化氟橡胶表面，所述油封包含唇部和金属环。通过下列方法测量摩擦系数。
油封摩擦系数测量测试：
将表面处理剂施用至形成油封（内径：85mm，外径：105mm，宽：13mm）唇部的硫化橡胶表面至10μm的厚度，而后在200oC热处理30分钟。其后，紧密密封润滑油(Motor Oil SM OW-30，由Toyota生产)并在热测试温度为100oC和旋转数为2000 rpm的条件下，在测试开始后一个小时测量该密封件的摩擦力和张力以计算摩擦系数。评价产品的摩擦系数如下：0.34或更小：◎，0.35至0.44：○，0.45至0.54：△，和0.55或更大：×。（显然以◎或○显示低的摩擦作用）。
实施例2至6
在实施例1中，以各种方式改变TDI加合物的量和润滑剂填充物的种类和量。使用的石墨是由Nippon Graphite Industries生产的Graphite HPO，使用的二硫化钼是由Daito Lubricating Corporation生产的LM-13。
实施例7
在实施例2中，测量包含由硫化的丙烯酸类橡胶制成的唇部的油封的摩擦系数。
对比实施例1
在实施例1中，没有用表面处理剂对唇部进行表面处理。
对比实施例2
在实施例7中，没有用表面处理剂对唇部进行表面处理。
对比实施例3
在实施例2中，以相同量的使用甲苯二异氰酸酯[TDI]代替TDI加合物进行用表面处理剂的表面处理。
下表显示在实施例和对比实施例中获得的测量结果。各成分的量以固体物质重量%表示。 
Figure 395561DEST_PATH_IMAGE001

Claims (4)

1.用于油封唇部的表面处理剂，其包含润滑剂填充物和由甲苯二异氰酸酯和三甲醇丙烷加合物组成的加成化合物，将所述表面处理剂施用至形成油封唇部的硫化橡胶的表面，所述油封包含唇部和金属环。
2.根据权利要求1所述的用于油封唇部的表面处理剂，其中所述润滑剂填充物是氟树脂粉末、 石墨、或二硫化钼。
3.根据权利要求1所述的用于油封唇部的表面处理剂，其中所述唇部是由氟橡胶或丙烯酸类橡胶的硫化产品制成。
4.油封，其包含由硫化橡胶制成的唇部，用根据权利要求1、2、或3所述的表面处理剂对所述唇部的所述表面进行表面处理。
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