CN107151408B - 聚四氟乙烯树脂组合物 - Google Patents

聚四氟乙烯树脂组合物 Download PDF

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CN107151408B
CN107151408B CN201710123901.3A CN201710123901A CN107151408B CN 107151408 B CN107151408 B CN 107151408B CN 201710123901 A CN201710123901 A CN 201710123901A CN 107151408 B CN107151408 B CN 107151408B
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田渕祐平
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Abstract

含有67‑75体积%、优选69‑72体积%的聚四氟乙烯树脂和33‑25体积%、优选31‑28体积%的平均粒径为45‑80μm、优选50‑75μm的填充剂的聚四氟乙烯树脂组合物。由所述聚四氟乙烯树脂组合物得到的密封圈可以防止密封圈合口部的切断面彼此因油压而挤压固着，因此可有效地作为油封圈使用，该油封圈可用作应用于汽车或CVT的动力转向装置等的密封材料。

Description

聚四氟乙烯树脂组合物
技术领域
本发明涉及聚四氟乙烯树脂组合物。更具体地说，涉及有效地用作汽车的CVT用油封圈的成型材料等的聚四氟乙烯树脂组合物。
背景技术
在汽车的CVT(连续变速传动，无级变速器)或动力转向装置等中使用的油封圈要求耐压性，为了满足这样的耐压性，使用填充有本身耐压性优异的玻璃纤维等的、含有多氟烷基的改性聚四氟乙烯树脂等(参照专利文献1)，但这种情况下可见对于壳体等中使用的匹配(相手)金属的攻击性增大的倾向。
另外，通常的密封圈中，为了容易地组装到装置中，将想要设置合口部的圆周上的一处切断，但如果这样的切断面彼此因油压而挤压固着，则之后密封圈无法贴合在壳体一侧。因此再次施加油压时，难以将油密封，会导致油穿过。由于这样的油的穿过，会发生发动机不能启动等的不良情况。
现有技术文献
专利文献
专利文献1：日本特开2000-1589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可得到密封圈的聚四氟乙烯树脂组合物，该密封圈可防止密封圈合口部的切断面彼此因油压而挤压固着。
解决问题的方案
上述本发明的目的通过含有67-75体积%聚四氟乙烯树脂和33-25体积%平均粒径45-80μm的填充剂的聚四氟乙烯树脂组合物实现。
发明效果
由本发明的聚四氟乙烯树脂组合物得到的密封圈可防止密封圈合口部的切断面彼此因油压而挤压固着。因此可有效地作为油封圈使用，该油封圈可用作应用于汽车或CVT的动力转向装置等的密封材料。
具体实施方式
作为聚四氟乙烯树脂，可以使用四氟乙烯的均聚物或者由2重量%以下的可共聚的单体（例如具有全氟烷基醚基、多氟烷基或其它氟烷基的侧链基）改性的共聚物中的任意一种。
聚四氟乙烯树脂是在含有该树脂和特定粒径的填充剂的组合物中以67-75体积%、优选69-72体积%的比例使用。若聚四氟乙烯树脂以比这少的比例使用，则聚四氟乙烯树脂本身的性质难以表现。
作为填充剂，将平均粒径(通过激光衍射式粒度分布测定装置测定)为45-80μm、优选50-75μm的焦炭粉末、青铜粉末、玻璃珠、碳珠等，优选焦炭粉末、青铜粉末，在组合物中以33-25体积%、优选31-28体积%的比例使用。使用填充剂的平均粒径在此之外的填充剂时、或填充剂以低于此的比例使用时，则无法获得所期望的防止固着的效果。另一方面，若填充剂以高于此的比例使用，则对于匹配材料的攻击性提高，会丧失作为密封材料的功能。需说明的是，作为青铜粉末，当然可以使用球状材料，也可以使用无定形青铜、多孔青铜中的任意一种。另外，体积%是考虑比重，由重量%换算的。
另外，填充剂使用长径比接近1的、例如长径比1-2的接近球状的形状的材料。纤维状物等长径比高的材料虽然对所得密封材料赋予耐磨损性等的特性，但如后述比较例4-6所示，难以期待所需的防止固着的效果。
以上的各成分在根据需要混合颜料等后，使用亨舍尔混合机、通用混合机等混合机进行混合，在约40-80MPa的成型压下保持约1.5-3分钟左右而预成型，然后在约360-380℃下烧结约2-3小时左右而成型。
实施例
下面，就实施例说明本发明。
实施例1
将70体积%的聚四氟乙烯树脂(Du Pont-Mitsui Fluorochemicals Co., Ltd.制品Teflon<注册商标>7-J，比重2.14～2.18)和30体积%的平均粒径48μm的焦炭(OrientalIndustry Co., Ltd.制品AT-No.5C，比重1.9～2.1)用亨舍尔混合机混合，使用压缩成型器将所得的混合物在69MPa的成型压下保持2分钟，然后预成型为4×4×8mm的长方体状，接着在375℃下烧结3小时，制作试样。
使用剃刀，将所得试样在长轴方向上切为2等份，将2个4×4×4mm立方体的切断面彼此在干燥(空气中)环境下、面压7MPa、温度160℃下固着1小时，然后用Autograph拉伸，测定达到可剥离的应力作为固着应力，结果为0.15Mpa，判定为○。这里，将固着应力低于0.25Mpa的判定为○，为0.25Mpa以上的判定为×。
实施例2
在实施例1中，聚四氟乙烯树脂量变更为75体积%、且焦炭量变更为25体积%使用，结果固着应力为0.18MPa(判定：○)。
比较例1
在实施例1中，聚四氟乙烯树脂量变更为80体积%、且焦炭量变更为20体积%使用，结果固着应力为0.29MPa(判定：×)。
比较例2
在实施例1中，聚四氟乙烯树脂量变更为85体积%、且焦炭量变更为15体积%使用，结果固着应力为0.47MPa(判定：×)。
比较例3
在实施例1中，聚四氟乙烯树脂量变更为90体积%、且焦炭量变更为10体积%使用，结果固着应力为0.52MPa(判定：×)。
比较例4
在实施例1中，使用相同量(30体积%)碳纤维(纤维直径10μm，纤维长70μm，比重1.6)代替焦炭，结果固着应力为0.45MPa(判定：×)。
比较例5
在实施例1中，使用相同量(30体积%)玻璃纤维(纤维直径10μm，纤维长30μm，比重2.54)代替焦炭，结果固着应力为0.40MPa(判定：×)。
比较例6
在比较例5中，聚四氟乙烯树脂量变更为90体积%、且玻璃纤维量变更为10体积%使用，结果固着应力为0.72MPa(判定：×)。
比较例7
在实施例1中，作为焦炭，使用相同量(30体积%)平均粒径为35μm的焦炭，结果固着应力为0.28MPa(判定：×)。
比较例8
在比较例7中，聚四氟乙烯树脂量变更为90体积%、且焦炭量变更为10体积%使用，结果固着应力为0.74MPa(判定：×)。
比较例9
在实施例1中，使用相同量(30体积%)平均粒径为30μm的球状青铜代替焦炭，结果固着应力为0.33MPa(判定：×)。
比较例10
在实施例1中，使用相同量(30体积%)平均粒径为96μm的球状青铜代替焦炭，结果固着应力为0.27MPa(判定：×)。
实施例3
在实施例1中，使用相同量(30体积%)平均粒径为75μm的无定形青铜代替焦炭，结果固着应力为0.17MPa(判定：○)。
比较例11
在实施例1中，使用相同量(30体积%)平均粒径为43μm的无定形青铜代替焦炭，结果固着应力为0.37MPa(判定：×)。
实施例4
在实施例1中，使用相同量(30体积%)平均粒径为50μm的多孔青铜代替焦炭，结果固着应力为0.14MPa(判定：○)。
比较例12
在实施例1中，使用相同量(30体积%)平均粒径为35μm的多孔青铜代替焦炭，结果固着应力为0.34MPa(判定：×)。

Claims (4)

1.油封圈，该油封圈由聚四氟乙烯树脂组合物制作，所述聚四氟乙烯树脂组合物含有67-75体积%的聚四氟乙烯树脂和33-25体积%的平均粒径45-80μm的填充剂，其中，作为填充剂使用仅含有长径比为1-2的焦炭粉末或青铜粉末的填充剂。
2.权利要求1所述的油封圈，其中，使用69-72体积%的聚四氟乙烯树脂以及31-28体积%的填充剂。
3.权利要求1所述的油封圈，其中，使用平均粒径50-75μm的填充剂。
4.权利要求1或2所述的油封圈，其用作应用于汽车的无级变速器或动力转向装置的密封材料。
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JP3674314B2 (ja) 1998-06-17 2005-07-20 Ｎｏｋ株式会社 Ｐｔｆｅ樹脂組成物

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CN1312891A (zh) * 1998-08-07 2001-09-12 达纳公司 轴承材料
CN1357568A (zh) * 2000-12-05 2002-07-10 旭硝子株式会社 聚四氟乙烯的附聚产物及其模塑产品
CN104471292A (zh) * 2012-07-25 2015-03-25 Nok株式会社 氟树脂制密封环
CN104072919A (zh) * 2013-03-29 2014-10-01 日本华尔卡工业株式会社 配管密封用氟树脂制垫片

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