CN105367993A - 一种耐磨自润滑衬垫的制备方法 - Google Patents
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Abstract
本发明涉及一种耐磨自润滑衬垫的制备方法,该衬垫的原料组成中包括:70~95重量%的酚醛树脂、30~5重量%醇溶性聚酰胺树脂、15~30重量%混纺纤维布;所述的混纺纤维布为聚四氟乙烯纤维和聚间苯二甲酰间苯二胺纤维按同等重量比例混纺的混纺布;该衬垫制备过程包括:在50-60℃,按配比,将30~5重量%醇溶性聚酰胺树脂溶解于醇溶剂中,待溶解后,加入70~95重量%酚醛树脂,搅拌均匀互溶成溶液,将经过等离子体预处理过的混纺纤维布浸渍入上述溶液中,浸渍5~10min后,移至70-80℃鼓风烘箱中干燥1-2h,然后,用平板熟化机热压成型所需的耐磨自润滑衬垫。所制备的衬垫耐磨和自润滑性优良。
Description
技术领域
本发明涉及一种耐磨自润滑衬垫的制备方法,更确切地说涉及由酚醛树脂醇溶性尼龙树脂和特种纤维混纺布热压成型制备衬垫的方法。
技术背景
本发明的衬垫可供自润滑关节轴承用,而自润滑关节轴承是一种球面滑动轴承,它结构简单、体积小、承受载荷大等特点,可广泛使用于航空航天、机械、化工。纺织、冶金、机车、汽车、船舶和水利工程等领域。本发明的自润滑耐磨衬垫可延长关节轴承的寿命。
酚醛树脂和尼龙树脂都是具有耐磨的自润滑性的树脂,它们结合制备的衬垫具有摩擦系数低、磨耗率低、承载能力强和耐久耐用的特点。近年来引起了人们极大的关注。
现有技术USPat.20140169713(A1)-2014-06-19披露了具有自润滑衬垫的滑动轴承,其自润滑衬垫的组成为:60~80重量%聚醚酮基树脂、10~30重量%聚四氟乙烯、5~15重量%碳纤维和15重量%芳酰胺纤维。自润滑衬垫用注射成形制备,衬垫厚度为0.5mm。滑动轴承的外环和自润滑衬垫使之成为整体,该轴承可在-45~+163℃使用。该技术没有指明这一滑动轴承就是关节轴承,从组成上看它用了聚醚酮基树脂和碳纤维,成本较高。
不同的轴承和不同的用途,其衬垫所使用的化学组成也不同。本发明所使用的醇溶性聚酰胺国内就有好几家生产厂家。例如:上海赛璐璐厂就有PANS-210、PANS-310。上海臻威复合材料有限公司有PAES-11透明醇溶性液尼龙,PAES-4醇溶性尼龙和上海新浩化工有限公司的醇溶性尼龙PAL等等。国外,SMK-马来西亚聚酰胺606公司有PS-2聚酰胺树脂(醇溶性)。
至于酚醛树脂那是一个老品种,国内杭州树脂厂、无锡光明化工有限公司、苏州宇益化工有限公司都有2127酚醛树脂睽异生产,从上面看来,关节轴承用衬垫所需的原材料可以立足国内。摆在面前的课题是筛选配方制备适合于关节轴承用的衬垫,就成为了本发明者们的任务。
发明内容
本发明者们为制备关节轴承用自润滑衬垫即制备摩擦系数小、磨损率低、承载能力强的耐磨自润滑衬垫做了大量的工作,进行了潜心研究完成了本发明的目的任务。
本发明的完整的技术方案是:
一种耐磨自润滑衬垫的制备方法,耐磨自润滑衬垫的原料组成中包括:以酚醛树脂和醇溶性聚酰胺树脂重量之和为100重量%计,70~95重量%的酚醛树脂、30~5重量%醇溶性聚酰胺树脂、15~30重量%混纺纤维布;在醇溶性聚酰胺树脂溶液中,醇溶性聚酰胺树脂含量为5~40重量%;所述的混纺纤维布为聚四氟乙烯纤维和聚间苯二甲酰间苯二胺纤维按同等重量比例混纺的混纺布;该衬垫制备过程包括:在50-60℃,按配比,将外观呈白色,熔点145℃,粘度120mPa.s/25℃,密度1.08Kg/m3,纯度≥99.99%的30~5重量%醇溶性聚酰胺树脂溶解于醇溶剂中,待溶解后,加入70~95重量%酚醛树脂,搅拌均匀互溶成溶液,将经过等离子体预处理过的混纺纤维布浸渍入上述溶液中,浸渍5~10min后,移至70-80℃鼓风烘箱中干燥1-2h,然后,用平板熟化机热压成型所需的耐磨自润滑衬垫。
本发明中所述的醇溶剂是从乙醇、2-丙醇、特丁醇中任选一种或几种。
本发明中所述的酚醛树脂是苯酚和甲醛聚合而成的树脂,它的特定指标为:游离酚≤2%,粘度120~180(s/25℃)。
本发明中所述的等离子体预处理混纺纤维布,处理条件为在氧气、氦气氛围下,真空度<15~80Pa,处理时间3~5min,混纺纤维布厚度为0.4mm。
本发明中所述的醇溶性聚酰胺树脂和酚醛树脂混合溶液浸渍的混纺纤维布的热压成型条件为:半固化成型条件:温度70-80℃,压力10MPa,时间7-12min;耐磨自润滑衬垫的固化成型条件为:130℃/2h,180℃/2h。
按照本发明对醇溶性聚酰胺树脂性能的要求,可选用上海赛璐璐厂生产的PANS-210或上海臻威复合材料有限公司生产的PAES-4牌号树脂。
同样,按本发明对酚醛树脂性能的要求,可选用无锡光明化工有限公司或苏州宇益化工有限公司生产的PF-2127酚醛树脂,对酚醛树脂的性能要求是游离酚≤2%、粘度120-180s/25℃。
等离子体预处理混纺纤维布,混纺纤维布组成为50重量%聚四氟乙烯纤维、50重量%聚间苯二甲酰间苯二胺纤维,这里的两种纤维总和为100重量%。混纺纤维布厚度0.4mm。等离子体预处理条件为:在氧气、氦气氛围下,真空度<15~80Pa,处理时间3~5min。混纺布也可用聚四氟乙烯和聚砜酰胺纤维混纺的布。
醇溶性聚酰胺树脂和酚醛树脂混合溶液浸渍的混纺纤维布的热压条件为:耐磨自润滑衬垫的半固化成型条件为温度70-80℃,压力10MPa,时间7-12min;耐磨自润滑衬垫的固化成型条件为130℃/2h,180℃/2h。
按照本发明制备的耐磨自润滑衬垫,其性能指标为:承载能力强、储能模量为900MPa、内耗系数tanδ为0.065、可在往复作用下使用、线膨胀系数在-40℃~+150℃为30×10-6m/K;载荷量为125MPa;高速(60次/分)下其摩擦系数为0.042;磨损量为182μm。在500±10MPa静载荷下,总变形量为0.06~0.08mm;永久压缩变形为0.04~0.05mm。本发明的耐磨自润滑衬垫不仅适用于关节轴承的滑动轴承,还适用于球面滑动轴承和套筒式滑动轴承等。
具体实施方式
为了更好地实施本发明,有必要把耐磨自润滑衬垫的主要性能指标测试方法作简要介绍:
1.采用栓-盘式高温摩擦磨损试验机测试耐磨自润滑衬垫的摩擦系数和磨耗量。测试条件为:室温、125MPa、60次/min。
2.采用动态热力学分析仪器(DMA)测试耐磨自润滑衬垫的剪切损耗角δ(即tanδ)和储能模量。样条尺寸为80mm×10mm×2mm。测试条件:三点弯曲模式、室温~300℃、10℃/min。
3.采用热力学分析仪(TMA)测试耐磨自润滑衬垫的线膨胀系数。样条尺寸:80mm×10mm×2mm。测试条件:-400~+300℃,10℃/min。
4.采用万能试验机测试耐磨自润滑衬垫的永久变形。测试条件:500±10MPa。
为了更好地实施本发明,特举例说明之。但实施例决不是对本发明保护范围的限制。
实施例1
向装配有搅拌器、温度计和回流冷凝器的500ml三口烧瓶中盛入235g乙醇和54g具有熔点145℃,粘度120mPa.s/25℃,密度1.08Kg/m3,纯度≥99.99%的白色的醇溶性聚酰胺树脂PANS-210(上海赛璐璐厂生产),在75℃搅拌溶解,溶解后加入249g游离酚≤2%、粘度120~180s/25℃的酚醛树脂PF-2127(无锡光明化工有限公司生产),搅拌均匀互溶后,放入等离子体预处理过的混纺纤维布70g。这里混纺布为聚四氟乙烯纤维和聚间苯二甲酰间苯二胺纤维(nomex)按同等重量比例混纺而成(上海市纺织品研究院提供产品)。等离子体预处理条件在氧气、氦气氛围下,真空度<15~80Pa,处理时间3~5min。混纺布厚度为0.4mm。经过预处理的混纺布增加了与酚醛树脂和醇溶性聚酰胺树脂之间的粘结力,能使衬垫紧密牢固。浸渍8min,然后移至75℃鼓风烘箱中干燥1.5小时,然后用平板熟化机热压成型所需的耐磨自润滑衬垫。这里的热压条件为:半固化成型条件为温度70-80℃,压力10MPa,时间7-12min;固化成型条件为为130℃/2h,180℃/2h。产品衬垫性能为:储能模量900MPA,内耗量tanδ=0.065,线膨胀系数在-40~+15℃为30×10-6m/k。60~140℃为51.5×10-6m/k,载荷量为125MPa,摩擦系数0.042、磨耗量为180μm、在500±10MPa静载荷下总变形量为0.06~0.08mm,永久压缩变形为0.04~0.05mm。
实施例2
除在60℃用2-丙醇300g溶解醇溶性聚酰胺PAL15g(上海新浩化工有限公司),与285g酚醛树脂PF-2127(无锡光明化工有限公司生产)混合均匀;混纺布45g(混纺布为聚四氟乙烯和聚砜酰胺纤维Tanlon,上海特氨纶纤维有限公司提供),浸渍时间5min;鼓风烘箱温度为70℃外,其他配方和操作条件均与实施例1相同;除线膨胀系数60~140℃为35×10-6m/k,永久压缩性变为0.04mm外,热压成型的耐磨自润滑衬垫产品的其他性能指标和实施例1一样。
实施例3
除在50℃用特丁醇225g溶解90g醇溶性聚酰胺PAES-04(上海臻威复合材料有限公司提供),与210g酚醛树脂PF-2127(无锡光明化工有限公司生产)混合均匀;混纺布90g(来源和实施例1一样),浸渍时间为10min外,其他配方和操作条件均与实施例1相同;热压成型的耐磨自润滑衬垫产品的性能指标和实施例2一样。
Claims (5)
1.一种耐磨自润滑衬垫的制备方法,其特征在于,耐磨自润滑衬垫的原料组成中包括:以酚醛树脂和醇溶性聚酰胺树脂重量之和为100重量%计,70~95重量%的酚醛树脂、30~5重量%醇溶性聚酰胺树脂、15~30重量%混纺纤维布;在醇溶性聚酰胺树脂溶液中,醇溶性聚酰胺树脂含量为5~40重量%;所述的混纺纤维布为聚四氟乙烯纤维和聚间苯二甲酰间苯二胺纤维按同等重量比例混纺的混纺布;该衬垫制备过程包括:在50-60℃,按配比,将外观呈白色,熔点145℃,粘度120mPa.s/25℃,密度1.08Kg/m3,纯度≥99.99%的30~5重量%醇溶性聚酰胺树脂溶解于醇溶剂中,待溶解后,加入70~95重量%酚醛树脂,搅拌均匀互溶成溶液,将经过等离子体预处理过的混纺纤维布浸渍入上述溶液中,浸渍5~10min后,移至70-80℃鼓风烘箱中干燥1-2h,然后,用平板熟化机热压成型所需的耐磨自润滑衬垫。
2.根据权利要求1所述的一种耐磨自润滑衬垫的制备方法,其特征在于,所述的醇溶剂是从乙醇、2-丙醇、特丁醇中任选一种或几种。
3.根据权利要求1所述的一种耐磨自润滑衬垫的制备方法,其特征在于,所述的酚醛树脂是苯酚和甲醛聚合而成的树脂,它的特定指标为:游离酚≤2%,粘度120~180(s/25℃)。
4.根据权利要求1所述的一种耐磨自润滑衬垫的制备方法,其特征在于,所述的等离子体预处理混纺纤维布,处理条件为在氧气、氦气氛围下,真空度<15~80Pa,处理时间3~5min,混纺纤维布厚度为0.4mm。
5.根据权利要求1所述的一种耐磨自润滑衬垫的制备方法,其特征在于,所述的热压成型条件为:半固化成型条件:温度70-80℃,压力10MPa,时间7-12min;固化成型条件为:130℃/2h,180℃/2h。
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