91results about How to "Improve shear stability" patented technology

The invention discloses an automobile continuously variable transmission fluid and a preparation method thereof. The automobile continuously variable transmission fluid comprises the following components: 100 parts by weight of class III base oil, 1-3 parts by weight of antiwear agent, 5-15 parts by weight of viscosity index improver, 0-1 part by weight of pour point depressant, 0.5-2.5 parts by weight of alkaline earth clearing agent, 2-6 parts by weight of dispersant, 0.5-1 part by weight of antioxidant, 1-4 parts by weight of friction modifier and 0.01-0.05 part by weight of anti-foaming agent. According to the invention, the chosen additives are optimally combined together to obtain the CVTF, and the obtained CVTF has excellent comprehensive properties; the CVTF is excellent in viscosity index, oxidation stability, shear stability, wearing quality and cryogenic property, and more critically, large in torque, high in traction coefficient and high in transmission efficiency; and consequently, the use requirements of B-CVT and T-CVT can be met simultaneously.

The invention relates to lubricating grease and a preparation method thereof, particularly relates to composite lubricating grease and a preparation method thereof, and belongs to the technical field of chemistry. According to the invention, base oil, thickener and additive are prepared into lithium-calcium base lubricating grease according to a proper ratio; the lithium-calcium base lubricating grease has the characteristics of favorable high temperature property, shear stability, extreme pressure wear resistance, water resistance and the like; and the invention is simple in preparation method, stable in product performance, low in product comprehensive cost and is suitable for large-scale industrial production.

The invention relates to superstrong extreme pressure antiwear lubricating grease and a preparation method thereof; particularly, a densifier is generated by calcium sulfonate with a high base number through a phase inversion reaction, and the lubricating grease is prepared by combining base oil with other functional additives, wherein the base oil is combined by base oil with high viscosity and medium viscosity. The method comprises the following steps: stirring and mixing the composite base oil and the calcium sulfonate in a reaction vessel, heating, adding a phase inversion promoter, glacial acetic acid, and water, heating and reacting at a constant temperature, adding calcium hydrate, aliphatic acid and boric acid after the phase inversion is completed, reacting at a constant temperature, heating and dehydrating, adding an anti-oxidant, refining, transferring the materials into a blending vessel, adding an eutectic rolling additive and an adhesion improver, dispersing and homogenizing the mixture, filtering, and degassing to obtain the finished product. The lubricating grease of the invention has excellent water sprinkling resistance, excellent high and low temperature performance, superstrong extreme pressure antiwear performance, excellent pumping performance, outstanding shearing stability, and antirust performance.

The invention discloses a preparation method of high-performance silicon dioxide grease, which comprises the following components, base oil of 70 to 90 weight percent, silica of 5 to 30 weight percent, modifying agent is in a dose of 5-30 weight percent of the silicon dioxide. The silicon dioxide grease of the invention has a very good storage stability and shear stability, good colloidal stability, water resistant properties of high temperature and low temperature performance. The silicon dioxide grease can be used for electrical insulation, damping system lubrication, vacuum sealed, instruments and cock sealing and lubricating, can also be used for resistant chemical media site lubricating and sealing, and so on. In addition, the silicon dioxide grease can also be used for preparing valves grease, methanol resistance grease, and is applicable in lubrication and interrupter of the metal contact of switch silvering, silver plating, and tinning and other.

A lube base oil satisfying at least one of the following requirements (a) and (b). A lubricating oil composition for internal combustion engines is provided which comprises the lube base oil, an ash-free antioxidant containing no sulfur as a constituent element, and at least one member selected among ash-free antioxidants containing sulfur as a constituent element and organ omolybdenum compounds. Also provided is a lubricating oil composition for drive transmission devices which comprises the lube base oil, a poly(meth)acrylate-type viscosity index modifier, and a phosphorus compound. (a) The content of saturated matters is 90 mass% or higher and the proportion of cyclic saturated matters in those saturated matters is 10-40 mass%. (b) The lube base oil satisfies the relationship represented by the following expression (1). 1.440=n20-0.002OEv100=1.453 (1) [In the expression, n20 indicates the refractive index at 20 DEG C of the lube base oil and kv100 indicates the dynamic viscosity (mm2/s) at 100 DEG C of the lube base oil].

The invention relates to an anti-rust extreme pressure lithium lubricating grease composition and a preparation method thereof. The composition is prepared from 5.5%-12.5% of thickening agents, 72.8%-91.3% of base oil, 0.5%-3.8% of extreme pressure anti-wear agents, 0.28%-1.25% of antioxidants and 0.02%-1.05% of anti-rust anti-corrosion agents, wherein the base oil is high-viscosity mineral oil. The preparation method of the composition comprises the steps that one third of the base oil and 12-hydroxy stearin or a mixture of 12-hydroxy stearin and stearic acid are heated to the temperature ranging from 60 DEG C to 80 DEG C, a lithium hydroxide solution is added, the temperature is raised to range from 180 DEG C to 220 DEG C after a reaction is completed, one third of quenching oil is added, the extreme pressure anti-wear agents, the anti-rust anti-corrosion agents and the rest of the base oil are added after cooling is conducted, and the composition is prepared after grounding is conducted. The novel lubricating grease containing the extreme pressure components and the anti-rust anti-corrosion components has the excellent extreme pressure property and anti-corrosion property and can be widely applied to severer environment conditions with a medium or heavy load and water.

The invention discloses an excellent carbamido lubricating grease composition with shear stability and a preparation method of the carbamido lubricating grease composition. The carbamido lubricating grease provided by the invention comprises: (a) base oil, (b) a carbamido thickening agent, and (c) a surfactant, wherein the carbamido thickening agent is generated by a reaction of two or more kinds of diisocyanates, mono-aromatic amine and fatty amine; and borate oil, an extreme pressure antiwear agent containing sulfur, an antioxidant, an antirusting agent and the like are added to improve various performances of the carbamido lubricating grease. The carbamido lubricating grease prepared by the preparation method provided by the invention has good mechanical stability, water-resistance, heat resistance, extreme pressure abrasion resistance, pumping performance and the like, can be applied to the lubrication and the protection of a turret, a crystallizer, a segment roller bed, a withdrawal and straightening unit, a pendulum shear and a conveying roller of metallurgy continuous casting equipment, and is also applied to the lubrication of a tandem mill, bearings of friction parts of high-temperature heavy-duty equipment and the like.

The invention belongs to the technical field of automobile transmission and discloses full-synthetic continuously variable transmission (CVT) transmission fluid as well as a preparation method and application thereof. The transmission fluid comprises the following components in parts by weight: 100 parts of type IV base oil, 0-20 parts of type V base oil, 0.5-2.4 parts of an anti-wear agent, 2-5 parts of viscosity index improvers, 1-3 parts of an alkaline-earth metal clearing agent, 2-6 parts of a dispersing agent, 0.3-0.8 part of an antioxidant and 1-3 parts of a friction modifier. The full-synthetic continuously variable transmission transmission fluid has excellent comprehensive performance, has excellent viscosity index, oxidation stability, shear stability, wear resistance, low-temperature resistance and high transmission efficiency, and can simultaneously meet strict service requirements of various CVTs.

The invention discloses a preparation method of high shear stability lithium grease, comprising the following steps: saponifying, heating to dehydrate, refining at high temperature, quenching sharply to mix, standing, mixing into grease, shearing, homogenizing, re-shearing and deaerating. The preparation method of high shear stability lithium grease adds the steps of standing and recutting and overcomes the defect of uneven growth of soap fibers in the traditional lithium grease production technology, and the length of the soap fibers has a proper proportion, therefore, a three-dimensional cavity formed by the soap fibers can absorb a large amount of base oil, and an orienting arrayed crystal fiber structure is formed. When the good colloid stability of the lithium grease is ensured, the lithium grease has prominent high shear stability, the penetration change rate of 100 thousand time extended work is less than 8 percent, a bearing grease exchanging period can be extended above 2000 hours/time from 500 hours/time generally, and the service life of mechanical equipment can be prolonged by 4-5 times.

Ball grinding mill bearing bush lubricating oil and a manufacturing method thereof solve the problem that a ball grinding mill bearing bush is poor in lubrication in the severe environment. The ball grinding mill bearing bush lubricating oil is formed by using synthetic oil as base oil and refining multiple added efficient composite additives, has the advantages of being abrasion-resisting, high-temperature-resisting, oxidation-resisting, firm in formed film and the like, and can repair wire drawing and reduce abrasion and bearing bush temperature at fastest speed. The work efficiency and the product quality are improved obviously, the repair and maintenance costs are reduced, the service life of a device is prolonged, and energy consumption is reduced greatly. The ball grinding mill bearing bush lubricating oil is composed of, by mass, mineral lubricating oil 49%-69%, polyester synthetic oil 20%-40%, thickening agent 0.05%-0.15%, organic molybdenum composite additive 2.5%-4.5%, T306 additive 1%-3%, T202 antioxygen 0.4%-0.6%, T551 metal deactivator 0.7%-0.9% and T704 antirust additive 0.6%-0.8%, wherein the summation of the components is a hundred percent.

A process for preparing the ethylene-propylene copolymer used to modify lubricating oil includes such steps as heating hexane to 10-50 deg.C, introducing the gas mixture of ethylene, propylene and hydrogen gas in a polyreactor while adding acetylacetone vanadium as catalyst and halogenated alkylaluminium as cocatalyst, stirring while reaction for 1-3 hr until reaction finished, adding methanol for termination, washing with alkali solution, and vacuum drying.

The invention provides a viscosity index improver composition, comprising the following components by weight: 10-90% of polymethacrylate, 10-90% of polyisobutylene and 0-20% of base oil. The viscosity index improver composition provided by the invention can be used in gearbox or vehicle gear oil, and has a good shearing stability and low temperature performance.

An 8-uril grease lubricant contains, by weight, 70-90% of lubricating base oil and 10-30% of an 8-uril densifier calculated according to the total weight of the grease lubricant being 100%. The preparation method of the 8-uril grease lubricant provided by the invention comprises a step of respectively performing reactions between diisocyanate and diamines and between diisocyanate and monoamines to obtain the 8-uril grease lubricant. In comparison with a 2-uril grease lubricant, the 8-uril grease lubricant has higher dropping point, better extreme pressure performance, colloid stability and shearing stability.

The invention relates to a long-acting wire rope hemp core grease. The long-acting wire rope hemp core grease comprises 13-17wt% of palm wax, 16-19wt% of microcrystalline wax, 15-19wt% of naphthenic high-viscosity oil, 24-28wt% of paraffinic high-viscosity oil, 1.6-4.6wt% of zinc dialkyl dithiophosphate, 1.4-4.4wt% of nonyldiphenylamine, 4.5-8.5wt% of vinylacetic acid, 8.5-12.5wt% of polyisobutylene and 0.1-1wt% of calcium sulfonate. Compared with hemp core greases in the prior art, the long-acting wire rope hemp core grease has the advantages of high dropping point, no flowing in hot weather, fast online solidification after rope immersion, no loss, energy saving, no pollution to environment, large kinematic viscosity data, good adhesiveness, and realization of good fluidity and no flowing of a grease film in the motion and compressed processes. Prominently, the property of traditional hemp core greases (including imported hemp core greases) is changed to become weakly alkaline (the free base value is not greater than 0.15, NaOH%), so oxidation is effectively inhibited, generated free acids are neutralized, SH/T0325 oxidation stability test and SH/T0331 corrosion test are extremely well passed, the safe service life of a wire rope is effectively prolonged, and use environment is purified.

The invention discloses a high-viscosity high-pressure antiwear hydraulic oil which is prepared from the following raw materials in parts by weight: 30-50 parts of base oil, 8-16 parts of diisodecyl sebacate, 4-8 parts of polymethacrylate (PMA), 3-9 parts of dustless dithiophosphate, 2-14 parts of thiadiazole derivative, 3-6 parts of arylamine antioxidant, 1-6 parts of sulfonate, 2-4 parts of high-base-number sulfurized calcium alkyl phenate, 6-12 parts of vulcanized isobutylene, 2-8 parts of pentaerythritol ester, 7-10 parts of vulcanized isobutylene, 2-4 parts of di-n-butyl phosphite and 1-6 parts of di-tert-butyl-para-cresol. The high-viscosity high-pressure antiwear hydraulic oil has the advantages of favorable demulsibility, favorable hydrolytic stability, favorable heat stability, favorable filterability, outstanding wear resistance and obvious energy-saving effect.

The invention discloses a composite briquette binder, and belongs to the field of briquettes. Lithium-based lubricating grease, sodium-based bentonite, sodium aluminosilicate and the like are taken asraw materials to prepare a briquette binding material A, wherein the lithium-based grease has good fretting-wear-resisting performance, and while providing hydrophobicity and permeability effects andthe stable thermal effect, added hydrogen-containing silicone oil also possibly assists in providing the bonding stability of a blend, improves the bunching effect on pulverized coal particles and steadily improves the thermal effect and formation effect of the briquettes; and fish skin, rice straw, Lactobacillus bulgaricus and the like are blended and fermented, fish skin tissue and straw tissueare destroyed by microbial metabolism to obtain gum and saccharides, and thus the carbon content is increased while cohesiveness is ensured. The problems of high ash content, low carbon content and poor structural stability of the briquettes prepared through a briquette binder commonly used at present are solved.

The invention discloses heavy load bearing lubricating grease which comprises the following raw materials in parts by weight: 8-10 parts of octadecylamine, 4-6 parts of MDI (diphenylmethane-4,4'-diisocyanate), 8-10 parts of macromolecule fatty acid, 6-8 parts of low molecular acid, 7-8 parts of lithium hydroxide, 20-25 parts of water, 60-80 parts of base oil A, 40-60 parts of base oil B, 0.2-0.5 parts of an antioxidant A, 0.6-0.8 parts of an antioxidant B, 0.2-0.4 parts of an antirust agent, 0.2-0.5 parts of an extreme pressure anti-wear agent A, 1-2 parts of an extreme pressure anti-wear agent B, 5-15 parts of a tackifier, 2-3 parts of a stabilizer and 6-8 parts of a structure improver. Except the heavy load bearing lubricating grease disclosed by the invention is excellent in high temperature resistance, lubricating property, adhesivity, pumpability, oxidation stability and heat stability, the heavy load bearing lubricating grease is more excellent in shear stability, colloid stability, water resistance and extreme pressure anti-wear property.

The invention relates to high extreme pressure lithium-based lubricating grease. The production process comprises the following steps: adding 1/2 of base oil high-viscosity mineral oil, fatty acid, lithium hydroxide and calcium hydroxide according to the stipulated mixture ratio in parts by weight, performing saponification reaction at the temperature of 100 DEG C, then adding the heated oil, namely the remaining 1/2 of the base oil high-viscosity mineral oil, heating to 200 DEG C to the greatest extent to perform high-temperature refining, then cooling to 180 DEG C, further cooling to 110 DEG C, adding an antioxidant, an extreme pressure agent, an oily agent and a tackifier, then performing post-treatment by using a homogenizer or a cyclic shearing machine, filtering and packaging. Tests prove that the grease becomes thin when meeting water, the thinness is far less than that of traditional extreme pressure lithium, the grease is less prone to loss and can provide good anti-rust protection for bearings, when the water content in the grease is 15%, the extreme pressure performance is reduced to a smaller extent and higher than the extreme pressure performance of the traditional extreme pressure lithium grease, the bearings are not worn at all, the production is not affected, and the grease is very suitable for high load, high temperature, high speed and much water working conditions of the bearings.