CN107108975B - 硫化橡胶用表面处理剂 - Google Patents
硫化橡胶用表面处理剂 Download PDFInfo
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- CN107108975B CN107108975B CN201580051137.2A CN201580051137A CN107108975B CN 107108975 B CN107108975 B CN 107108975B CN 201580051137 A CN201580051137 A CN 201580051137A CN 107108975 B CN107108975 B CN 107108975B
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Abstract
本发明涉及硫化橡胶用表面处理剂,其包含以下有机溶剂溶液,所述溶液相对于固体成分为100重量份的含有异氰酸酯基的1,2‑聚丁二烯,以10~160重量份的比例含有氟树脂粒子,且使用2.5~20重量份的含有全氟烷基的低聚物系含氟表面活性剂作为分散剂。该硫化橡胶用表面处理剂可提高有机溶剂溶液的溶液稳定性,且可进一步提高由其形成的涂层被膜整体的硬度、耐磨损性和制品扭矩评价,可有效地作为油封的密封唇口部的涂层剂等使用。
Description
技术领域
本发明涉及硫化橡胶用表面处理剂。更详细而言,涉及可进一步提高涂层被膜整体的硬度、耐磨损性和制品扭矩评价的硫化橡胶用表面处理剂。
背景技术
一直以来,在被覆橡胶的金属制垫圈的橡胶层或轴承密封、油封等橡胶制弹性体滑动部的表面,为了防止粘着、防止粘连和提高耐磨损性,形成石墨的涂层膜,或脂肪酸的金属盐或酰胺、石蜡等蜡、硅油等的涂层膜,或含有乙基纤维素、酚醛树脂等作为粘结剂的涂层膜。发动机垫圈等在高面压、高温度条件下使用,若在此基础上进一步加上发动机的振动,则垫圈表面的橡胶被覆层磨损,有时会发生漏气。另外,轴承密封或油封等橡胶制弹性体滑动部的橡胶被覆层因反复滑动而磨损,有时会发生漏油。
因此,本申请人之前提出了以下硫化橡胶用表面处理剂,其是在作为发动机汽缸盖垫圈的使用环境的高面压、高温度下,甚至在如加上振动之类的苛刻的使用条件下,也几乎看不到在垫圈表面的橡胶被覆层产生磨损或破坏的现象,能够形成对气体密封有效的垫圈等的橡胶层的硫化橡胶用表面处理剂,其中,在液态1,2-聚丁二烯的含羟基成分及作为其固化剂的1,2-聚丁二烯含异氰酸酯基成分中添加聚烯烃树脂的水性分散液(专利文献1)。
在这里,提出的硫化橡胶用表面处理剂虽然达成提高橡胶被覆层的耐磨损性的所期望的目的,但由于使用水性分散液,所以水促进1,2-聚丁二烯的羟基与异氰酸酯基之间的反应,另外水与异氰酸酯基本身也起反应,因此引起表面处理分散液的粘度上升和胶凝,发现有涂布加工时的操作性差的问题。另外,水与异氰酸酯基的反应会妨碍1,2-聚丁二烯的高分子量化,还发现有表面处理层的耐磨损性、耐剥离性和滑动性差的缺点。
为了解决上述问题,本申请人进一步提出了将聚烯烃树脂的水性分散液变更为聚烯烃树脂的有机溶剂分散液的硫化橡胶用表面处理剂(专利文献2)。但是,由于在该方法中不含有聚四氟乙烯等氟树脂,所以会有因高温压缩时的粘着或高面压下的摩擦磨损而发生涂膜剥落的问题。
本申请人进一步提出了以下硫化橡胶用表面处理剂,其是不损害以往的防止粘着、防止粘连和提高耐磨损性的硫化橡胶用表面处理剂所要求的性能,且不因高温压缩时的粘着或高面压下的摩擦磨损而发生涂膜剥落的硫化橡胶用表面处理剂,其包含以下有机溶剂溶液,所述有机溶剂溶液相对于100重量份的含有异氰酸酯基的1,2-聚丁二烯或在其中共混含有羟基的1,2-聚丁二烯的1,2-聚丁二烯混合物,分别以10~160重量份的比例含有软化点为40~160℃的蜡和氟树脂(专利文献3)。
现有技术文献
专利文献
专利文献1:日本特开平3-252442号公报
专利文献2:日本特开平7-165953号公报
专利文献3:日本特开2003-213122号公报
专利文献4:日本特许第4997708号公报
专利文献5:日本特开2011-89074号公报
专利文献6:日本特许第3449014号公报。
发明内容
发明所要解决的课题
本发明的目的在于,提供以含有异氰酸酯基的1,2-聚丁二烯和氟树脂粒子的有机溶剂溶液为必要成分,且可进一步提高有机溶剂溶液的溶液稳定性、由其形成的涂层被膜整体的硬度、耐磨损性和制品扭矩评价的硫化橡胶用表面处理剂。
解决课题的手段
上述本发明的目的可通过以下硫化橡胶用表面处理剂达成,所述表面处理剂包含以下有机溶剂溶液,所述溶液相对于固体成分为100重量份的含有异氰酸酯基的1,2-聚丁二烯,以10~160重量份的比例含有氟树脂粒子,且使用2.5~20重量份的含有全氟烷基的低聚物系含氟表面活性剂作为分散剂。
发明的效果
在以往的技术中,通过掺混氟树脂粒子作为涂层剂的填充剂成分,提高低摩擦化和耐磨损性,但由于专利文献3中记载的作为氟树脂粒子的分散剂掺混的蜡成分降低粘结剂成分的硬度,所以难以使涂层被膜变硬。
在本发明中,通过将蜡成分替代为特定的含氟表面活性剂分散剂,可不降低粘结剂成分的硬度,而得到硬的涂层被膜。同时,提高作为有机溶剂溶液制备的硫化橡胶用表面处理剂的溶液稳定性,即将氟树脂粒子有效地分散在有机溶剂溶液中,可有效地抑制粒子的沉降,结果提高涂布涂层时的操作性,另外形成均匀且稳定的被膜。此外,即使添加少量的分散剂也有效,可不降低涂层被膜的硬度,而良好地分散氟树脂粒子。
另外,通过形成硬的涂层被膜,可抑制油封的密封唇口部的变形,结果可提高耐磨损性和制品扭矩评价。
本发明所涉及的硫化橡胶用表面处理剂不仅可有效地应用于油封的密封唇口部等密封部件,而且对复印机用的橡胶辊、橡胶带,工业用的橡胶软管、橡胶带,汽车用的刮水器、密封条、门玻璃导槽等橡胶部件的防止粘着、低摩擦化、提高耐磨损性也有效。
具体实施方式
作为含有异氰酸酯基的1,2-聚丁二烯,使用加成异氰酸酯基作为端基的分子量为1,000~3,000左右的材料,其可直接使用固体成分浓度约为3~70重量%的市售品、例如日本曹达制品日曹TP-1001 (固体成分浓度为50重量%的醋酸丁酯溶液)等。该聚丁二烯树脂可与硫化橡胶表面的官能团或含有羟基的成分反应,进行粘接、固化,与同样用异氰酸酯基进行反应而高分子化的聚氨基甲酸酯树脂相比,与橡胶的亲和性(相性)、相容性好,因此有与橡胶的粘附性好、特别是耐摩擦磨损特性好的特征。
另外,由于该含有异氰酸酯基的1,2-聚丁二烯在端基加成异氰酸酯基,所以通过与硫化橡胶表面的官能团或作为任选成分的含有羟基的1,2-聚丁二烯反应来高分子化,也可作为含有羟基的1,2-聚丁二烯的固化剂使用。作为此时使用的加成羟基作为端基的含有羟基的1,2-聚丁二烯,可使用分子量为1000~3000左右的化合物,可直接使用市售品,例如日本曹达制品日曹G-1000、C-1000、GQ-1000、GQ-2000等。
在将含有异氰酸酯基的1,2-聚丁二烯和含有羟基的1,2-聚丁二烯混合使用的情况下,均以固体成分计,以25重量%以上、优选40~100重量%的比例使用含有异氰酸酯基的1,2-聚丁二烯,以75重量%以下、优选0~60重量%的比例使用含有羟基的1,2-聚丁二烯。在含有异氰酸酯基的1,2-聚丁二烯比上述比例少的情况下,与橡胶的粘附性会降低,进而滑动性、非粘着性能降低,耐摩擦磨损特性会降低。
作为氟树脂粒子,可列举出粒子状的聚四氟乙烯[PTFE]、四氟乙烯/六氟丙烯共聚物、四氟乙烯/全氟(烷基乙烯基醚)共聚物、聚偏氟乙烯、聚氟乙烯、乙烯/四氟乙烯共聚物等。
作为这些的氟树脂粒子,使用将通过本体聚合、悬浮聚合、溶液聚合、乳液聚合等得到的氟树脂分级为粒径约为0.1~5μm左右的粒子,或将通过悬浮聚合、溶液聚合、乳液聚合等得到的分散液通过剪切搅拌等来微粒分散为约0.1~5μm左右的粒子,将通过上述聚合得到的树脂进行凝结·干燥后,通过干式粉碎或冷却粉碎来微粒化为约10μm以下的粒子。对于设定为约0.1~10μm的粒径,在粒径更小的情况下,有形成小的涂布厚度的优点,但接触面积因涂布表面的凹凸变小而变小,因此在低面压下摩擦系数有变大的倾向,另一方面在粒径更大的情况下,涂布厚度变大,因此涂布时的成本增加,但凹凸变大,在低面压下与对象材料的接触面积变小,因此摩擦系数会降低。因此,根据使用要求适宜调整粒径,例如在密封部件等中考虑上述优点、缺点来确定,优选使用约0.5~2μm左右的粒子。
氟树脂粒子相对于固体成分为100重量份的含有异氰酸酯基的1,2-聚丁二烯,以10~160重量份、优选25~125重量份的比例,根据需要作为有机溶剂的溶液或分散液使用。若氟树脂粒子的比例比上述比例多,则与橡胶的粘附性、耐摩擦磨损特性变差,损害皮膜的柔软性,因此在固化涂膜上产生裂缝,另一方面若比该范围少,则滑动性、非粘着性会变差。需说明的是,在将本发明所涉及的硫化橡胶用表面处理剂用于密封部件等的情况下,氟树脂粒子优选25~120重量份。
作为分散剂起作用的含氟表面活性剂,使用具有碳原子数为6以下的全氟烷基的含有全氟烷基的低聚物系材料,例如使用将具有碳原子数为1~6的全氟烷基作为疏水基的(甲基)丙烯酸酯单体和具有聚氧化乙烯、聚氧化丙烯等聚氧化亚烷基作为亲水基的作为大分子单体(分子量约为2000~10000)的(甲基)丙烯酸酯单体共聚而得的低聚物(25℃下在水中的溶解性:0.1%以下) (专利文献4)。此时,相对于1摩尔的单体中的烯属不饱和基,使用约0.1~0.6摩尔的聚合引发剂,达成低聚物化反应,同时也可共聚丙烯酸2-羟基乙基酯等其它单体。与之相对的是,简单的氧化乙烯加成型(25℃下在水中的溶解性:1%以上)的材料欠缺溶液的稳定性,对于提高耐磨损性不怎么有效。
实际上,直接使用市售品,例如AGC Semichemical制品Surflon S-611、DIC制品F-561等。由于它们对水为不溶性,在异丙醇、甲醇、甲乙酮、甲基异丁基酮、醋酸乙酯、丙二醇单甲基醚醋酸酯、甲苯等中具有约1~10重量%的溶解性,根据情况具有10重量%以上的溶解性,所以有时也以有机溶剂溶液的形态供给。另外,对于甲苯、丙二醇单甲基醚醋酸酯,作为0.1%溶液具有23mN/m左右的表面张力。
这些含氟表面活性剂分散剂以每固体成分为100重量份的含有异氰酸酯基的1,2-聚丁二烯,约为2.5~20重量份、优选约为5~20重量份的比例使用。若比该范围少地使用,则氟树脂粒子的分散性恶化,不仅会产生沉降,而且也无法达成耐磨损性的充分的提高。另一方面,若比上述比例多地使用,则粘结剂硬度降低,扭矩会上升。
在专利文献5中,记载了使用上述含氟表面活性剂分散剂,且含有粘结剂树脂、作为固体润滑剂的氟树脂和有机溶剂的涂料组合物,但粘结剂树脂设为聚酰胺酰亚胺树脂、聚酰亚胺树脂、环氧树脂或丙烯酸树脂,另外根据其实施例的记载,虽然认为润湿性和耐硝酸试验(耐化学药品性)满足合格标准,但在使用氧化乙烯加成型(EO基数=12或18)的含氟表面活性剂的情况下也得到相同的效果的方面,可见与本发明的不同。
在本发明所涉及的硫化橡胶用表面处理剂中,也可添加使用具有下述组成的含有OH基的氟树脂组合物溶液和/或硅油。
作为有机溶剂溶液使用的含有OH基的氟树脂组合物包含以下组合物,所述组合物的固体成分浓度约为10~50重量%,含有以下(A)和(B)的共聚物[I]、丙烯酸烷基酯的聚合物[II]、氟代烯烃的聚合物[III]和固化剂[IV],
(A) (甲基)丙烯酸全氟烷基烷基酯,
(B) 含有羟基的(甲基)丙烯酸酯,
且共聚物[I]、聚合物[II]和聚合物[III]为2~15:35~70:20~50的重量比(总和为100)等。由于该含有OH基的氟树脂组合物溶液具有OH改性基,所以可与作为粘结剂成分的含有异氰酸酯基的1,2-聚丁二烯有效地反应,形成稳定的耐久性高的被膜。这些含有OH基的氟树脂组合物的详细内容例如记载在专利文献6中。另外,作为有机溶剂,例如使用甲基异丁基酮-醋酸乙酯-甲乙酮混合溶剂等。
作为共聚物[I]的(B)成分的含有羟基的(甲基)丙烯酸酯,例如使用(甲基)丙烯酸2-羟基乙基酯等。聚合物[II]是在与基材的粘附性、与其它成分的相容性、形成与需求一致的皮膜的方面重要的成分。作为聚合物[III],例如使用偏氟乙烯系聚合物等,在皮膜的断面方向位于作为表面成分的共聚物[I]与作为粘附成分的聚合物[II]的中间,担负防止基材树脂中含有的颜料、染料、增塑剂等添加剂向涂布层转移的屏障层的作用。作为固化剂[IV],相对于聚合物[I]、[II]、[III]的总量,以约0.001~100重量%的比例使用具有与OH基反应的反应性官能团(例如异氰酸酯基、环氧基等)的有机化合物。
作为含有OH的氟树脂组合物溶液,实际上使用市售品,例如DIC制品Defensa TR-101 (OH值:6.0mgKOH/g溶液)、102 (OH值:2.7mgKOH/g溶液)、103 (OH值:4.1mgKOH/g溶液)等。
含有OH基的氟树脂组合物溶液以每固体成分为100重量份的含有异氰酸酯基的1,2-聚丁二烯,其固体成分约为100重量份以下、优选约为10~65重量份的比例使用。含有OH基的氟树脂组合物溶液的使用对提高形成的涂层被膜的耐磨损性有效,但是即使以更高的比例使用,也无法改善耐磨损性。
本发明中使用的硅油可为二甲基硅油、苯基甲基硅油等非改性型或具有环氧基、氨基、巯基等官能团的改性型,但是其粘度必须为8,000cs (8Pa·s)以上。若硅油的粘度比8,000cs小,则会欠缺与橡胶基材的充分的粘附性。实际上,使用市售品,例如Shin-EtsuSilicone制品KF-96H-100万cs、KF-96H-10,000cs等非改性硅酮或同公司制品KF-1001等环氧基改性硅油。
相对于固体成分为100重量份的含有异氰酸酯基的1,2-聚丁二烯,这些的硅油以约60重量份以下、优选约10~40重量份的比例使用。若以更高的比例使用,则涂层被膜的耐磨损性恶化,会引起被膜表面的发粘。
作为有机溶剂,单独或作为混合溶剂使用甲苯、二甲苯、醋酸乙酯、醋酸丁酯、甲乙酮、甲基异丁基酮等。使用有机溶剂的稀释量根据涂布厚度(膜厚)、涂布方法适宜选择,通常设定使得所有固体成分浓度约为3~20重量%、优选约为5~15重量%。需说明的是,膜厚通常为1~10μm,优选为2~5μm,在膜厚比上述厚度小的情况下,无法完全地被覆橡胶表面,有时会损害滑动性、非粘着性。另一方面,若膜厚比上述厚度大,则涂布表面的刚性变高,有时会损害密封性、柔软性。在密封部件等使用用途中,膜厚优选1~5μm左右。
作为可通过上述表面处理剂处理的橡胶,可列举出氟橡胶、丁腈橡胶、氢化丁腈橡胶、乙烯-丙烯橡胶、苯乙烯-丁二烯橡胶、丙烯酸橡胶、氯丁二烯橡胶、丁基橡胶、天然橡胶等一般的橡胶材料,其中优选使用在橡胶中掺混的防老化剂、油等向橡胶表面层的起霜少的橡胶材料。需说明的是,根据橡胶材质或目的,适宜选择上述各种成分的掺混比例和有机溶剂的种类、有机溶剂量、有机溶剂混合比例。
作为硫化橡胶表面处理剂向橡胶表面的涂布方法,可列举出浸渍、喷雾、辊式涂布、流动涂布等涂布方法,但并不限定于上述方法。此时,优选预先在涂布表面处理剂前通过清洗等除去橡胶表面的污垢等。特别是在起霜物、渗出物从硫化橡胶中析出至表面的情况下,进行使用水、洗剂、溶剂等的清洗和干燥。
在向橡胶表面涂布硫化橡胶表面处理剂后,在约150~250℃下进行约10分钟~24小时左右的热处理来进行煅烧。在加热温度比上述温度低,且加热时间比上述时间短的情况下,皮膜的固化和与橡胶的粘附性不充分,非粘着性、滑动性变差。另一方面,在加热温度比上述温度高,且加热时间比上述时间长的情况下,会引起橡胶的热老化。因此,需要根据各种橡胶的耐热性,适宜设定加热温度、加热时间。
另外,在要求降低排气量的硫化橡胶的情况下,可单独或组合进行热处理、减压处理、提取处理等,但热处理在经济上最好,为了减少排气量,优选在约150~250℃下进行1~24小时左右的热处理,为了将橡胶中的低分子成分和皮膜中的蜡、聚丁二烯中含有的低分子成分气化,温度越高或时间越长越有效。
实施例
以下针对实施例说明本发明。
实施例1
PTFE树脂粒子(AGC Semichemical制品Fluon 172J, 22重量份
粒径为0.2μm)
低聚物系含氟表面活性剂(同公司制品Surflon S-611) 4 〃
含有NCO基的1,2-聚丁二烯(日本曹达制品TP-1001, 98 〃
固体成分浓度为50重量%的醋酸丁酯溶液)
醋酸丁酯[AcOBu] 876 〃
制备包含以上各种成分的表面处理剂(总和为1000重量份),进行以下各个项目的测定、评价。
溶液稳定性:在玻璃容器中制备表面处理剂,经时地目视确认有无沉降。
(评价) ○:无沉降
△:很久后沉降
×:立即沉降
粘结剂硬度:在金属板上,只涂布涂层剂的粘结剂成分(除去氟树脂粒子成分)使得成为50μm的膜厚,在200℃下煅烧10小时,制备样品,使用岛津制作所制动态超微硬度计,在负荷速度为14.1mN/秒下压入三棱锥压头(棱间角为115°),测定压入深度为10μm时的动态硬度。
优选为10~30的值。
摩擦系数:在厚度为2mm的硫化压缩成形的氟橡胶表面涂布涂层剂使得膜厚为10μm,在200℃下煅烧10小时,制备样品,使用新东科学制HEIDON TYPE 14DR,在涂层被膜表面按压加载50g负荷的直径为10mm的钢球(網球),在往复移动距离为50mm、速度为50mm/分钟的速度下移动,测定动摩擦系数。
(评价) ○:低于0.13
△:0.13以上且低于0.17
×:0.17以上
耐磨损性试验:在厚度为2mm的硫化压缩成形的氟橡胶表面涂布涂层剂使得膜厚为10μm,在200℃下煅烧10小时,制备样品,使用Rhesca制Friction Player FPR-2000,在涂层被膜表面按压加载2kg负荷的直径为3mm的压头球,在平均面压为3.9MPa、线速度为20.9cm/秒的速度下旋转,测定至涂层被膜剥落、露出橡胶为止的转数。
(评价) ◎:15万次以上
○:5万次以上且低于15万次
△:1万次以上且低于5万次
×:低于1万次
制品评价:使用扭矩测定用旋转试验机,在转数为500~8000rpm、油温为80℃的条件下测定扭矩值。
(评价) ○:与以往制品相比扭矩值降低
△:与以往制品同等的扭矩值
×:与以往制品相比扭矩值上升
实施例2
在实施例1中,分别将含有NCO基的1,2-聚丁二烯量变更为77重量份,将醋酸丁酯量变更为868重量份,进而使用29重量份的含有OH基的氟树脂组合物溶液(DIC制品DefensaTR-103,OH值为4.1mgKOH/g的溶液,固体成分浓度为30重量%)。
实施例3
在实施例1中,分别将PTFE树脂粒子量变更为21重量份,将含有NCO基的1,2-聚丁二烯量变更为90重量份,将醋酸丁酯量变更为878重量份,进而使用8重量份的硅油(Shin-Etsu Silicone制品KF-96H 100万cs)。
实施例4
PTFE树脂粒子(Fluon 172J) 37重量份
含氟表面活性剂(Surflon S-611) 4 〃
含有NCO基的1,2-聚丁二烯(TP-1001) 74 〃
醋酸丁酯 885 〃
制备包含以上各种成分的表面处理剂,进行与实施例1相同的测定、评价。
实施例5
在实施例4中,分别将含有NCO基的1,2-聚丁二烯量变更为59重量份,将醋酸丁酯量变更为879重量份,进而使用22重量份的含有OH基的氟树脂组合物溶液(Defensa TR-103)。
实施例6
在实施例4中,分别将PTFE树脂粒子量变更为34重量份,将含有NCO基的1,2-聚丁二烯量变更为68重量份,将醋酸丁酯量变更为886重量份,进而使用8重量份的硅油(KF-96H100万cs)。
实施例7
在实施例1中,使用相同量(4重量份)的DIC制品F-561作为低聚物系含氟表面活性剂。
比较例1
在实施例1中,使用相同量(4重量份)的AGC Semichemical制品Surflon S-243(氧化乙烯加成型)作为含氟表面活性剂。
比较例2
在实施例1中,使用相同量(4重量份)的DIC制品F-444 (氧化乙烯加成型)作为含氟表面活性剂。
比较例3
在实施例1中,将醋酸丁酯量变更为880重量份,不使用低聚物系含氟表面活性剂。
比较例4
在实施例1中,分别将含氟表面活性剂量变更为1重量份,将醋酸丁酯量变更为879重量份。
比较例5
氟树脂粒子溶液 365重量份
(固体成分浓度为5重量%的醋酸丁酯溶液)
PE蜡溶液(固体成分浓度为5重量%的醋酸丁酯溶液) 365 〃
含有OH基的氟树脂组合物溶液(Defensa TR-103) 40 〃
氨基甲酸酯树脂溶液(DIC制品16-416, 40 〃
固体成分浓度为30重量%的MEK-IPA混合溶剂溶液)
异丙醇[IPA] 95 〃
甲乙酮[MEK] 95 〃
制备包含以上各种成分的表面处理剂,进行与实施例1相同的测定、评价。
比较例6
氟树脂粒子溶液 468重量份
(固体成分浓度为5重量%的醋酸丁酯溶液)
PE蜡溶液(固体成分浓度为5重量%的醋酸丁酯溶液) 468 〃
含有NCO基的1,2-聚丁二烯(TP-1001) 54 〃
含有OH基的氟树脂组合物溶液(Defensa TR-103) 10 〃
制备包含以上各种成分的表面处理剂,进行与实施例1相同的测定、评价。
比较例7
在比较例6中,将含有NCO基的1,2-聚丁二烯量变更为56重量份,进而使用8重量份的硅油(KF-96H 100万cs),不使用含有OH基的氟树脂组合物溶液。
比较例8
在比较例6中,分别将氟树脂粒子溶液量、PE蜡溶液量均变更为470重量份,将含有NCO基的1,2-聚丁二烯量变更为60重量份,不使用含有OH基的氟树脂组合物溶液。
将在以上各个实施例和比较例中得到的测定结果示出于以下的表中。
Claims (5)
1.硫化橡胶用表面处理剂,其包含以下有机溶剂溶液,所述溶液相对于固体成分为100重量份的含有异氰酸酯基的1,2-聚丁二烯,以10~160重量份的比例含有氟树脂粒子,且使用2.5~20重量份的含有全氟烷基的低聚物系含氟表面活性剂作为分散剂。
2.权利要求1的硫化橡胶用表面处理剂,其中,相对于固体成分为100重量份的含有异氰酸酯基的1,2-聚丁二烯,以固体成分计,进一步添加100重量份以下的具有以下组成的含有OH基的氟树脂组合物和/或60重量份以下的粘度为8,000cs以上的硅油,所述组合物含有以下(A)和(B)的共聚物[I]、丙烯酸烷基酯的聚合物[II]、氟代烯烃的聚合物[III]和固化剂[IV],
(A) (甲基)丙烯酸全氟烷基烷基酯,
(B) 含有羟基的(甲基)丙烯酸酯。
3.权利要求1或2的硫化橡胶用表面处理剂,其作为油封的密封唇口部的涂层剂使用。
4.油封,其具有以下密封唇口部,所述密封唇口部具有由权利要求3的硫化橡胶用表面处理剂形成的涂层被膜。
5.权利要求4的油封,其油封具有以下密封唇口部,所述密封唇口部具有如下得到的涂层被膜:在用硫化橡胶用表面处理剂对密封唇口部进行涂布处理后,在150~250℃下进行热处理。
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