本发明提供一种在宽温度范围内粘度变化率小(粘度指数高)、即使在低温下也为低粘度、低温流动性和耐挥发性良好、基体分解少的润滑油。 oil.目的是提供基础油。 为了解决该问题,将使用特定脂肪族单羧酸的甲基戊二醇二酯用作润滑油基础油。

Polyol ester lubricant compositions comprising predominately straight chain C5-10 alkylcarboxlate esters of neopentyl alcohols, for example, straight chain C5-10 alkylcarboxlate esters of one or more of trimethylol propane, pentaerythritol, di-pentaerythritol, tri-pentaerythritol or pentaerythritol oligomers, and working fluids comprising said lubricant compositions and a hydrocarbon refrigerant, suitable for heat transfer devices including refrigeration and air conditioning systems are provided. The polyol ester lubricant compositions have a kinematic viscosity at 40° C. of 22-125 cSt and a viscosity index of greater than 140, and are characterized by having very high lubricity, excellent load carrying properties and excellent low temperature properties.

Mixtures of select neopentyl polyol esters are found to be highly miscible with the refrigerant R-32 over a wide temperature range. Working fluids are provided comprising R-32 and a lubricant containing these select neopentyl polyol esters and having a kinematic viscosity at 40° C. of 32 cSt or higher. Specifically, the lubricant composition of the invention comprises a mixture of alkylcarboxy esters of neopentyl polyols, wherein at least 10 wt % of all neopentyl polyol esters are esters of pentaerythritol oligomers of 4 or more pentaerythritol monomer groups, and wherein a majority of the alkylcarboxylate groups of the alkylcarboxy esters of neopentyl polyols are pentanoyl groups wherein at least 15% of the pentanoyl groups are branched.

Mixtures of select neopentyl polyol esters are found to be highly miscible with the refrigerant R-32 over a wide temperature range. Working fluids are provided comprising R-32 and a polyol ester lubricant composition having a kinematic viscosity at 40° C. of from 32 to 120 cSt, said lubricant composition comprising C5-10 alkylcarboxy esters di-pentaerythritol wherein at least 40 mol %, typically more, of the alkylcarboxylate groups of the alkylcarboxy esters are pentanoyl groups.

Combining a metal based friction modifier, such as a molybdenum dialkyldithiocarbamate, and certain esters of hydroxy carboxylic acids, such as short chain alkyl esters of citric or tartaric acid, e.g., tributyl citrate, has a synergistic effect on lowering the friction coefficient of lubricating oils allowing one to reduce the amount of metal based friction modifier needed to adequately formulate a lubricant with low friction characteristics.

Lubricant compositions comprising an improved ashless organic friction modifier additive, capable of reducing both friction and wear, is provided. It has been found that mixtures of fatty-alkanolamides containing secondary hydroxyls on the amino alkyl substituent, such as amide mixtures prepared from bis(2-hydroxyporopyl)amine and mixtures of at least two different C8-24 fatty acids, provide better oil solubility and friction reduction than alkanolamides with primary hydroxyl functionality, such as amide mixtures prepared from di-ethanol)amine.

本发明涉及一种润滑脂及其制备方法，尤其涉及一种重载汽车轮毂轴承用润滑及其制备方法，属于化工技术领域。本发明包括以下原料：（A）占润滑脂总重的60%-85%的基础油；（B）稠化剂为占润滑脂总重7-12%的C12-C22的一元有机酸，0.5-3%的癸二酸，0.2-1%的硼酸，3-5%的氢氧化锂油溶液；（C）添加剂为占润滑脂总重0.5-3%的硫代氨基甲酸酯、2-5%的硫化烯烃棉籽油、2-4%的二烷基二硫代氨基甲酸盐、0.5-2.5%二烷基二硫代磷酸钼、0.3-2%的防锈剂和0.3-1%的抗氧剂。其有益效果是：缩短生产时间，且工艺更可控，产品质量稳定；高温轴承漏失量少，且极压性能突出，能更好地为重载车辆轮毂提供润滑保护；能满足各种工况下的重载汽车轮毂轴承的润滑需求，并延长了轮毂轴承的换脂周期。

本发明涉及一种润滑脂及其制备方法，尤其是一种耐水型极压锂基润滑脂及其制备方法，属于化工技术领域。本发明按重量百分数计，包括以下组分：基础油70-90%，脂肪酸9-15%，氢氧化锂1-2%，氢氧化钙粉末0.3-0.7%，抗氧剂0.1-0.5%，防锈剂0.3-1.5%，极压剂2-5%，增粘剂2-5%。其有益效果是：保证了产品在一般工况下，具有较高的滴点和较好的剪切稳定性；产品的抗水性优异，确保在有大量水冲刷时流失少，且在有水的条件下工作，不易软化流失，机械稳定性好；产品具有良好的防锈性和极压抗磨性，能为潮湿工况下重负荷设备提高良好的润滑，且防止润滑表面锈蚀。

A multigrade lubricating oil composition for use in an internal combustion engine which composition comprises : (a) a base oil comprising at least 90 % by weight of the base oil, of one 5 or more basestocks selected from the group consisting of base stocks derived from Fischer Tropsch synthesised, waxy, paraffinic hydrocarbon material by processes comprising hydrocracking and/or hydroisomerisation, Group II basestocks, Group III basestocks and mixtures thereof; (b) one or more dispersant viscosity modifiers in a total amount of 0.15 to 0.8 % by weight of the composition; (c) one or more dispersants in a total amount of active 10 dispersants of 1.5 to 3 % by weight of the composition; (d) one or more detergents; and (e) one or more metal dihydrocarbyl dithiophosphates.

在非含水润滑组合物和/或在燃料组合物中，至少一种具有结构式(I)的化合物作为摩擦改性剂的用途，其中：m和n各自独立地为1‑6的整数；R1和R2各自独立地表示H或C1‑C10烃基；和R3表示C10‑C26烃基。以及包含至少一种结构式(I)表示的化合物的非含水润滑组合物和用于内燃机的燃料组合物。