172 results about "Polyolester" patented technology

An engine lubricant formulated as a complete crankcase motor oil or additive concentrate composed of a combination of chemical constituents including a base oil selected from a synthetic oil, a mineral oil or semi-synthetic base oil (hydrogenated oil) or combination thereof, an oil soluble molybdenum additive, a dispersant inhibitor containing zinc dithiophosphate, and viscosity index improvers and one or more seal swelling agents to lubricate the engine and recondition the seals of new and/or high mileage engines. Addition of a polyalphaolefin and/or one or more esters such as a diester or polyolester may also be utilized therein. The lubricant may be formulated as a complete engine oil crankcase lubricant, or concentrated into an additive for addition to conventional mineral oil based engine oil, synthetic engine oils, or blends thereof in an effective amount of up to 30 percent volume percent, typically from 20 to 25 percent by volume.

The invention pertains to heat transfer compositions, particularly to automobile refrigerants comprising a hydrofluoroalkene, an iodocarbon, a polyol ester and at least one compound comprising trifluoromethane, methyl iodide, heptafluorobutane or propene.

Provided is a lubricating oil composition for a refrigerator which uses a base oil including as the main component at least one kind of oxygen-containing compounds selected from polyoxyalkylene glycols, polyvinyl ethers, copolymers of poly(oxy)alkylene glycols or monoethers thereof and polyvinyl ethers, polyol esters, and polycarbonates. The lubricating oil composition for a refrigerator is used for a refrigerator that uses, as a refrigerant, a fluorine-containing organic compound, which is a refrigerant applicable to current car air conditioner systems or the like and has a specific polar structure, and has favorable sealing property, a low coefficient of friction factor in a sliding part, and excellent stability as well as excellent compatibility with the refrigerant.

The first lubricating oil composition of the invention comprises a polyol ester (A) as a base oil, a specific amount of a viscosity index improver (B) and a specific amount of an anti-wear agent (C), and the second lubricating oil composition of the invention comprises a paraffinic hydrocarbon oil (F) having at least 30 carbon atoms and a specific amount of a viscosity index improver (B), so that these compositions exert effects that they enable a life of watch battery to last long, they enable a watch to operate in the temperature range of −30 to 80° C. with one kind of a lubricating oil, and they are free from change of properties over a long period of time. The third lubricating oil composition of the invention comprises an ether oil (G) as a base oil, a specific amount of an anti-wear agent (C) comprising a neutral phosphoric ester and/or a neutral phosphorous ester, and an antioxidant (E), so that this composition is free from change of properties over a long period of time and is favorable as a watch lubricating oil. The watch of the invention is a watch having a movable portion for which at least one composition selected from the above compositions is used.

A composition including 2,3,3,3-tetrafluoropropene and a lubricating oil including a polyalkylene glycol and a polyol ester, the polyol ester content in the lubricating oil being less than or equal to 25%. A method of lubricating a vapor compression circuit, the method including using a mixture including a polyalkylene glycol and a polyol ester as lubricating oil in the vapor compression circuit, in combination with a heat transfer fluid comprising 2,3,3,3-tetrafluoropropene, the content of polyol ester in the lubricating oil being less than or equal to 25%. Further, the use of said composition in methods for heating or cooling.

A refrigerating machine oil including a refrigerating machine oil basis such as polyol ester oil and an additive polyol ester oil is mixed to a refrigerant including 2,3,3,3-tetrafluoropropene, 1,3,3,3-tetrafluoropropene or the like. A compressor for refrigeration and air-conditioning including the mixture charged therein is used. The composition of the additive polyol ester oil is 1 to 30 wt %.

The wear resistance of the compressor is improved, and the efficiency of a refrigerating and air-conditioning apparatus using the compressor is enhanced.

A method of improving performance of refrigerant systems such as refrigerators and air conditioners that utilize a refrigerant working fluid. The working fluid consists essentially of a heat transfer fluid and a lubricant that is miscible and is otherwise compatible with the heat transfer fluid at all operating temperatures of the refrigerant system. The method is directed particularly to chlorine-free fluoro-group organic fluids and more particularly to hydrofluorocarbon heat transfer fluids. The preferred lubricants comprise polyol ester basestocks and compounded polyol esters that are highly miscible with such hydrofluorocarbon heat transfer fluids.

A lubricating oil composition for refrigerators comprising a base oil which comprises as a main component a polyol ester compound obtained from a polyhydric alcohol selected from among pentaerythritol, dipentaerythritol, trimethylolpropane, and neopentyl glycol and a C₄ to C₂₀ aliphatic monocarboxylic acid and which has an acid value of 0.02 mgKOH/g or less and a hydroxyl value of 5 mgKOH/g or less. A compressor using the lubricating composition. The lubricating oil composition is applicable to such refrigerators that use a refrigerant having a specific structure, such as an unsaturated fluorinated hydrocarbon compound, and being usable in current car air conditioner systems, and has excellent compatibility with the refrigerant, good sealing properties, capability of imparting a low coefficient of friction to sliding members and, yet, excellent stability. The compressor uses the lubricating composition.

An absorptive refrigeration method that employs a refrigerant comprising one or more hydrofluoroolefin or hydrochlorofluoroolefin refrigerants, and an oil selected from the group consisting of a polyalkyene glycol oil, a poly alpha olefin oil, a mineral oil and a polyolester oil.

The present invention relates to a lubricating basestock for the blends of hydrofluorocarbon and optionally hydrochlorofluorocarbon refrigerants comprising a blend of (A) at least one alkylbenzene and (B) at least one polyol ester. While alkylbenzenes are not miscible with the refrigerant blend at the desired operating temperature and pressure of refrigeration or air-conditioning systems, the addition of low concentration of polyol ester is found to greatly improve the miscibility of the alkylbenzene and polyol ester blend. An important criteria of the invention is that the lubricant blend of polyol ester and alkylbenzene are sufficiently miscible with the hydrofluorocarbon refrigerant blend both as a liquid and a gaseous refrigerant over the operational temperatures of the compression refrigeration system.

A lubricating composition is provided comprising a polyol ester which is the reaction product of a neopolyol with linear or branched monocarboxylic acids and mixtures thereof having from 1 to about 25 carbon atoms and a natural or GTL oil of lubricating viscosity and mixtures thereof and wherein the weight ratio of the ester to oil will be sufficient to provide a composition having a viscosity less than the individual viscosities of the ester and oil.

The invention relates to a wide temperature range polyol ester lubricating oil composition suitable for an aircraft engine. The wide temperature range polyol ester lubricating oil composition suitable for the aircraft engine consists of the following components in percentage by weight: 90-94 percent of polyol ester synthetic base oil, 2-5 percent of an organic polysulfide extreme-pressure wear-resisting agent, 0.5-1 percent of an antioxidant, 1-3 percent of a detergent dispersant and 0.5-1 percent of a corrosion inhibitor. Compared with traditional aircraft lubricating oil, the wide temperature range polyol ester lubricating oil composition has the advantages of excellent low-temperature starting performance, favorable thermal oxidation stability, strong hydrolytic stability, excellent lubricating performance, biodegradability and the like, and can meet the requirements of a modern aircraft engine on long-period rigorous working condition running and wide temperature range use.

The invention provides refrigerating machine oil which comprises the following raw materials: 0.05wt%-0.1wt% of an antioxidant, 0.01wt%-0.05wt% of an anticorrosion agent, 1wt%-5wt% of an anti-wear agent, 0.0001wt%-0.005wt% of a defoaming agent and the balance of polyol ester, wherein polyol ester is obtained by esterification reaction of fatty acid and polyol; the polyol comprises one or two of pentaerythritol and dipentaerythritol. According to the refrigerating machine oil provided by the invention, polyol ester is adopted as base oil and is relatively high in viscosity and relatively good in compatibility with a refrigerant R134a at low temperature, so that the refrigerating machine oil is relatively high in viscosity and relatively good in compatibility with the refrigerant R134a at low temperature.

The invention relates to a refrigerator oil composition, which comprises polyol ester, (3,5-dialkyl-4-hydroxyphenyl) carboxylic thiophenyl alkyl ester, an antiwear agent, a metal passivator and an acid catching agent, wherein the polyol ester is pentaerythritol tetranitrate generated by reacting pentaerythritol with a mixture of isononanoic acid and diethyl caproic acid. The refrigerator oil composition provided by the invention has excellent oxidation stability. Compared with that of the refrigerator oil using the conventional antioxidant, the oxidative induction time of the refrigerator oil composition is obviously prolonged.

The invention relates to the use of a composition comprising a polyol ester-based lubricant and a refrigerant F comprising at least one tetrafluoropropene and at least one hydrofluorocarbon, in a heat transfer system containing a vapour compression circuit comprising an oil separator.

The invention provides neopentyl polyol ester automobile gear lubricating oil containing sulphurized isobutylene. The neopentyl polyol ester automobile gear lubricating oil is prepared by taking neopentyl polyol ester as basic oil, adding the sulphurized isobutylene with the code of T321, dialkyl pentasulfide with the code of RC2540 and a composition of a phosphorus family with the code of P120, and uniformly mixing. The proportions of the composition are as follows: the weight percents of esters added by taking the neopentyl polyol ester as the basic oil are as follows: 0.05%-0.35% of T321, 0.03%-0.39% of RC2540 and 0.02%-0.32% of P120. The neopentyl polyol ester automobile gear lubricating oil containing the sulphurized isobutylene has very good extreme pressure abrasion resistance and the bearing capability is up to 3361N; the minimum grinding crack value is shown in description. The neopentyl polyol ester automobile gear lubricating oil can be used for preparing heavy-load vehicle gear oil and can also be used for heavy-load and middle-load industrial gear oil.

Polymeric polyol ester additives for metal working applications are described that have lower pour points and improved solubility in API Group II and III basestocks. The polymeric polyol ester contains linear monocarboxylic acid, alkanedioic acid, alk(en)yl substituted succinic acid or anhydride, trihydric alcohol and pentaerythritol.

A system and method for retrofitting a refrigeration system containing an HCFC refrigerant and a compatible lubricant, with an HFC refrigerant, comprising providing a transport container containing a mixture of a miscible lubricant and the HFC refrigerant, removing the HCFC refrigerant from the refrigeration system while maintaining at least a portion of a lubricant immiscible with the HFC refrigerant, and charging the refrigeration system with the mixture. The polyol ester lubricant may be present in a range exceeding about 5-15% by weight, e.g., 8%.

The invention discloses a synthetic automobile gear lubricating oil containing pentasulfide and animal oil. Neopentyl polyol ester is used as base oil for the lubricating oil, American product sulfurated extreme pressure agent polymeric pentasulfide TDPS532, lard oil CD-1 and P120 are added. Formula of the lubricating oil is shown as follows: neopentyl polyol ester is used as base oil, and 0.03-0.3% of TDPS532, 0.03%-0.36% of lard oil CD-1 and 0.02-0.32% of P120 by weight percentage of neopentyl polyol ester are added. The synthetic automobile gear lubricating oil containing pentasulfide and animal oil has superb extreme pressure abrasion resistance, bearing capacity is up to 2832N, wear scar is 0.426mm when load is 392N and abrasion time is 60min, and when load is 441N and abrasion time is 30min, the wear scar is 0.374mm. The synthetic automobile gear lubricating oil containing pentasulfide and animal oil can be used for preparing heavy load automobile gear oil, and also can be used for heavy load and medium load industrial gear oil.

Polyol ester lubricant compositions comprising predominately straight chain C_5-10 alkylcarboxlate esters of neopentyl alcohols, for example, straight chain C_5-10 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.

A lubricating composition is provided that has good elastomer compatibility and friction-reduced properties which comprises a base oil having a viscosity index (VI) greater than about 80, a kinematic viscosity (Kv) of 100° C. of from about 2 mm²/s, containing 90 wt % or more saturates, having less than about 5 ppm sulfur, and wherein the base oil is derived from a waxy feed; and a minor amount of

• • (a) a polyol ester of an aliphatic carboxylic acid having 12 to 24 carbon atoms and
  • (b) an oil soluble or oil dispersible molybdenum compound.