低黏度基础油与氢化丁腈胶的相容性测试

低黏度基础油是影响与橡胶相容性的重要因素。对氢化丁腈胶与低黏度的石蜡基油,环烷基油,聚α-烯烃和合成酯的相容性进行了考察。通过测试氢化丁腈胶在基础油中浸泡后的体积与硬度来评价氢化丁腈胶与基础油的相容性。氢化丁腈胶的体积与硬度变化越大,相容性越差。氢化丁腈胶浸泡168 h后(100℃),在石蜡基油中,氢化丁腈胶的体积膨胀0.035%,硬度下降2.5 IRHD;在环烷基油中,体积膨胀0.187%,硬度下降5.7 IRHD;在聚α-烯烃中,体积膨胀0.033%,硬度下降2.4 IRHD;在合成酯中,体积膨胀0.362%,硬度下降9.8 IRHD,均出现体积膨胀和硬度下降。延长浸泡时间至1200 h也表现出相似的结果。相比之下,石蜡基油和聚α-烯烃与氢化丁腈胶的相容性较好,环烷基油与氢化丁腈橡胶的相容性稍次,合成酯与氢化丁腈橡胶的相容性较差。

水泥辊压机轴承润滑脂的研制

辊压机是水泥行业中广泛使用的新型预粉碎设备,可极大地提高生产效率,降低能耗。辊压机轴承转速低,负荷重,并伴有冲击负荷,对润滑脂的极压抗磨性能要求高。根据辊压机轴承的工况,拟定了辊压机轴承润滑脂的技术指标,研制了辊压机轴承润滑脂。通过对基础油,稠化剂和添加剂的选择,辊压机轴承润滑脂由150BS(分子质量为2400),锂/钙皂稠化剂,0.5%的胺型抗氧剂,2.0%苯并三氮唑,2.0%的噻二唑衍生物和2.0%的磺酸盐防锈剂组成,其常温磨迹为0.55 mm,高温(75℃)磨迹为0.53 mm,烧结负荷>6082 N。研制的辊压机轴承润滑脂具有良好的极压抗磨性能和使用性能,达到了研制目标,可满足水泥辊压机轴承的润滑要求。

A Generalized Correlation for Characterization of Lubricating Base-oils from Their Viscosities

Lubricating mineral base oils are normally extracted from lube-oil cuts with furfural solvent.Aromatic content in the raffinate phase from extraction process is an essential parameter that affects the quality of the lubricating base-oils.For determination of aromatic content by the usual ASTM D3238 method,density,refractive index and molecular weight of the raffinate are required.In this work,a new generalized correlation is developed for de-termination the aromatic content by using only the measured viscosity of lubricating oil.With a mole fraction of aromatic compounds,the kinematic viscosity may be obtained at any temperature between 60-100°C along with their molecular weight and refractive index.