180results about How to "Good shear stability" patented technology

(EN) The invention relates to the use of a partially neutralized, anionic (meth)acrylate copolymer comprising radically polymerized units of 25 to 95 percent by weight of C1 to C4 alkyl esters of acrylic or methacrylic acid and 5 to 75 percent by weight of (meth)acrylate monomers with an anionic group, at least 4 percent of which are neutralized by means of a base, for producing a medicament that is provided with an active substance-containing core and is coated with the partially neutralized, anionic (meth)acrylate copolymer. Said medicament releases at least 30 percent of the active substance contained therein in 30 minutes at a pH at which the active substance is sufficiently soluble and stable and at which the corresponding medicament that is coated with the non-neutralized anionic (meth)acrylate polymer releases less than 10 percent of the active substance contained therein.

The invention discloses a synthetic high-temperature lubricating grease and a production method thereof. The synthetic high-temperature lubricating grease is produced by taking synthetic oil as base oil and mixing the base oil with thickening agents, an extreme-pressure additive, an antioxidant and an anticorrosive agent, wherein the weight ratios of all ingredients are as follows: 47-94% of base oil, 2-20% of polyurea thickening agent, 2-20% of acylamide thickening agent, 0.5-5.0% of antioxidant, 1.0-5.0% of extreme-pressure additive and 0.5-3.0% of anticorrosive agent. In the invention, the synthetic base oil, the polyurea thickening agent and the acylamide thickening agent all have excellent high-temperature performance, and the organic combination thereof leads the lubricating grease to obtain excellent high-temperature performance; the polyurea thickening agent endows the lubricating grease with good colloid stability, and the acylamide thickening agent endows the lubricating grease with excellent anti-shear stability, therefore, the organic combination of colloid stability and anti-shear stability leads the lubricating grease to have excellent high-temperature performance and good losing resistance, does not change to thin and avoids losing at high temperature. The extreme-pressure anti-wear additive endows the lubricating grease with excellent extreme-pressure anti-wear performance, and the bearing capacity is high.

A mixture comprising A) a copolymer comprising from about 70 to about 79% by weight of units derived from ethylene, and having (a) Mw measured by gel permeation chromatography employing polystyrene standard ranging from about 50,000 up to less than 130,000 and / or (f) SSI≦18; (b) density (D) ranging from about 845 to about 895 kg / m3; (c) Mw / Mn less than 3; (d) melting point (Tm) measured by differential scanning calorimeter ranging from about 15° C. to about 60° C.; and (e) degree of crystallinity≧15%, and B) an amorphous polymer having Mw ranging from about 130,000 to about 1,000,000 having degree of crystallinity≦5%. In one embodiment the density and the melting point of the copolymer A) fulfill the expression Tm≦1.247 D−1037. In another embodiment, the percentage content (E: % by weight) of repeating units derived from ethylene and melting point (Tm: ° C.) of the copolymer A) fulfill the expression 3.44E−206≧Tm. Also, additive concentrates and lubricating compositions comprising the components making up the mixture.

Polymer particles are provided having (1) a core with a glass transition temperature within a range of −50° to +110° C. and (2) a shell surrounding the core. The core comprises at least one layer, with the layer(s) comprising at least one polymerized hydrophobic monomer and, optionally, a first cross-linker. The shell comprises a copolymerized mixture of least one hydrophobic monomer and at least one hydrophilic monomer and a second cross-linker for increasing thermal shear stability by forming cross-linkages. Use of these polymer particles in aqueous-based ink-jet inks provide laser print quality without any secondary treatment.

The invention discloses energy-efficient long-life gasoline engine oil prepared from the following components: synthetic base oil, a composite antioxygen, a metal cleaning agent, an ashless dispersant, a nano-level friction improver, a viscosity improver and a pour point reducer. The gasoline engine oil provided by the invention has the following advantages: requirements of API SM, ILSAC GF-4 and SAEJ300 are met and the service life is long; the complete synthetic base oil features low pour point, high viscosity index, good economy of fuel, degradability and reduced harm to the ecological environment; the phenol type antioxygen is combined with ZDDP, the anti-oxygen and antifriction properties are good and the catalyst poisoning in a tail gas processing unit is prevented; the acid neutralization capacity is good, the cleaning dispersibility is good and the oil sludge and carbon deposit are prevented from being generated; and the nano-level friction improver is added, the frictional factor is low, and the oil film features high carrying capacity and can automatically repair abraded surface and lengthen the service life of the engine.

An improved method of making CASE materials is provided, wherein the method utilizes a polymer latex derived from at least one ethylenically unsaturated monomer and at least one polymerizable surface active agent. The polymerizable surface active agent is capable of co-polymerization with traditional monomers and is preferably substantially completely consumed during the course of the polymerization. Latex polymers produced by the method of the present invention are well suited for use in coatings, adhesives, sealants, elastomers. Additionally, the present invention relates to improved coating, adhesive, sealant and elastomer (CASE) materials utilizing polymer latexes derived from various monomers and ethylenically unsaturated amine salts of sulfonic, phosphoric and / or carboxylic acids.

Polymer particles are provided having (1) a core with a glass transition temperature within a range of -50 to +110° C. and (2) a shell surrounding the core. The core comprises at least one layer, with the layer(s) comprising at least one polymerized hydrophobic monomer and, optionally, a first cross-linker. The shell comprises a copolymerized mixture of least one hydrophobic monomer and at least one hydrophilic monomer and a second cross-linker for increasing thermal shear stability by forming cross-linkages. Use of these polymer particles in aqueous-based ink-jet inks provide laser print quality without any secondary treatment.

The invention discloses a cation amino silicone oil micro-emulsion and a preparation method thereof. The cation amino silicone oil micro-emulsion is prepared from the following components in percentage by weight: 5-30% of organo-siloxane monomer, 0.1-0.5% silane coupling agent, 3-10% of cationic emulsifier, 2-8% of nonionic emulsifier, 0.1-0.5% of basic catalyst and the balance of water, and the total weight percentage of all the components is 100%. The particle size of the cation amino silicone oil micro-emulsion prepared by using the method is 50-100nm, which is very small. The solid content of the cation amino silicone oil micro-emulsion is 10-36%. The cation amino silicone oil micro-emulsion has excellent shear stability, heat stability and storage stability, and is a favorable softener for finishing natural fibers, such as textiles made of cotton, hemp, silk, wool and the like, and synthetic fibers, such as polyester, polyamide and polypropylene ester.

The present invention intends to provide an ethylene / alpha-olefin copolymer of specific structure, exhibiting excellent performance as a lubricant oil additive, capable of having various functional groups in high ratio, and serviceable as raw material for various solubilizing agents. The ethylene / alpha-olefin copolymer of the present invention is composed of ethylene and an alpha-olefin having 3 to 10 carbon atoms, and characterized by specific characteristics.

The invention is directed to a process for the preparation of high viscosity lubricant base stocks by contacting alphaolefin feedstocks with single-site metallocene catalysts in a mixed flow or continuous stirred tank reactors.

Lubricant compositions comprises a lubricant base oil and one or more compounds resulting the modification of a succinimide represented by formula (1) or (2) wherein R<1 >and R<2 >may be the same or different and are each independently a hydrocarbon group having 8 to 30 carbon atoms, R<3 >and R<4 >may be the same or different and are each independently a hydrocarbon group having 1 to 4 carbon atoms, R<5 >is hydrogen or a hydrocarbon group having 1 to 30 carbon atoms, n is an integer from 1 to 7. The lubricant compositions have a long-lasting anti-shudder property, an enhanced transmission capacity for a wet clutch, and an excellent shifting property.

The invention provides a temperature-resistant and salt-resistant polymer clean fracturing fluid thickening agent and a preparation method thereof. The temperature-resistant and salt-resistant polymer clean fracturing fluid thickening agent has the advantages of cleanliness, low damage, environmentally friendly characteristics, good viscosity increasing effects, very strong suspension properties,good thermal adaptability allowing a super-wide temperature range of 25 to 240 DEG C, good salt resistance, excellent shear stability, small frictional resistance, obvious fracture effects, long lasting time spent on production after compression, and good cost performance.

A lubricating oil composition for automatic transmissions wherein the mass ratio of phosphorus:calcium:boron:sulfur determined by elemental analysis is 1:(0.1 to 2):(0.06 to 2):(0.2 to 20), the concentration of phosphorus is from 0.01 to 0.06 percent by mass, the concentration of the sulfur derived from a base oil is from 0 to 0.1 percent by mass, and the concentration of the sulfur derived from sulfur-based additives is from 0.01 to 0.15 percent by mass, based on the total amount of the composition. The lubricating oil composition can prevent the occurrence of scratch phenomenon even over a long period of time when used in a metal belt type continuously variable automatic transmission.

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.

Disclosed is an improved method of making polymers. The method utilizes at least one ethylenically unsaturated monomer and at least one polymerizable surface active agent. The polymerizable surface active agent is capable of co-polymerization with traditional monomers and / or polymerization with itself (i.e. homopolymerization) and is preferably substantially completely consumed during the course of the polymerization. Polymers produced by the method of the present invention are well suited for use in coatings, adhesives, sealants, elastomers and the like, as they form stable films, possess excellent adhesion properties and have improved hydrolytic stability characteristics. The present invention also encompasses homopolymeric surface active agents and their use in polymerization reactions.

The invention relates to a nanometer emulsion type water control fracturing fluid for a tight gas reservation well and a preparation method of the nanometer emulsion type water control fracturing fluid. The nanometer emulsion type water control fracturing fluid is prepared by 0.3-0.5 part of amino silicon oil nanometer emulsion and 100 parts of water by weight. The preparation method comprises the following steps of: adding an emulsifying agent and a low-molecule alcohol into the amino silicon oil; uniformly mixing the emulsifying agent, the low-molecule alcohol and the amino silicon oil; adding an organic acid and some water; continuously stirring, then adding an electrolyte and the rest water, stirring until the phase is homogeneous, and then obtaining amino silicon oil nanometer emulsion. The preparation process mentioned in the invention is simple, the process is easy to control, and the nanometer emulsion type water control fracturing fluid obtained has hydrophobicity, obvious water control effect, low viscosity, small grain size, low surface tension and stable performance, so the nanometer emulsion type water control fracturing fluid is suitable for water control fracturing improvement of a near-water or high-water content tight gas reservation well.

The invention provides a worm gear oil composition and a preparation method of the worm gear oil composition. The worm gear oil composition comprises a combination of polyether oil base oil, a 2, 2, 4-trialkyl-1, 2-dihydroquinolines antioxidant and a metal passivator. The worm gear oil composition provided by the invention has outstanding oxidation stability, high-temperature detergency, extreme pressure antiwear property, viscosity-temperature performance, anti-foaming performance and high comprehensive performance; and in addition, the preparation method is simple and wide in applicable scope.

The present invention relates to acrylic block copolymers synthesized by a controlled free-radical process, and their use as low temperature flow modifiers in oil-based compositions. They are especially useful in modifying the low temperature flow behavior in lubricating oils. The acrylic copolymers are especially useful as pour point depressants in lubricating oil.

The invention provides a lubricating oil viscosity index improver and a preparation method thereof; the lubricating oil viscosity index improver has stable chemical performance, oxidation resistance, shear resistance and good compatibility with lubricating oil; in addition to good thickening ability to the lubricating oil, the lubricating oil viscosity index improver further has excellent anti-shear stability and viscosity-temperature performance. The viscosity index of the lubricating oil after modification is greater than 150, and low-temperature kinematic viscosity is less than 1600mpa.s. The lubricating oil viscosity index improver can not only be used for preparing multi-level lubricating oil, but also be used for improving the viscosity index of base oil of the lubricating oil with the low viscosity index, thereby having broad application prospects.

The invention provides an open gear oil composition and a preparation method thereof. The open gear oil composition is prepared from 85.5-99.56%, preferably 90.9-98.37%, more preferably 92-96% of ester synthetic oil, 0.1-8%, preferably 1-6% of anti-wear reagent at extreme pressure, 0.03-3.0%, preferably 0.1-1.5% of oil-based antiabrasive agent, 0.01-0.5%, preferably 0.03-0.1% of metal deactivator and 0.3-3.0%, preferably 0.5-1.5% of antioxygen according to the total weight of the open gear oil composition being 100%. The open gear oil composition has good antiabrasive and abrasion-resistant performance, extremely high bearing capacity and high anti-rust and water-resistant performance, further has excellent low-temperature fluidity and high-temperature adhesion and excellent shear stability, and has the wide application range, and no oil is shed when the open gear oil composition is used for a long time.

Disclosed is an improved method of making polymers. The method utilizes at least one ethylenically unsaturated monomer and at least one polymerizable surface active agent. The polymerizable surface active agent is capable of co-polymerization with traditional monomers and / or polymerization with itself (i.e. homopolymerization) and is preferably substantially completely consumed during the course of the polymerization. Polymers produced by the method of the present invention are well suited for use in coatings, adhesives, sealants, elastomers and the like, as they form stable films, possess excellent adhesion properties and have improved hydrolytic stability characteristics. The present invention also encompasses homopolymeric surface active agents and their use in polymerization reactions.

The invention is directed to a process for the preparation of lubricant base stocks by contacting alphaolefin feedstocks with single-site metallocene catalysts and recycling unconverted monomers, characterized by a purge step in the recycle.

The present invention aims to provide a viscosity index improver excellent in shear stability and having a low HTHS viscosity and a high viscosity index. The viscosity index improver of the present invention contains a (co)polymer (A) containing a polyolefin-based monomer as an essential monomer unit, and a base oil, wherein the absolute value of difference in solubility parameter between the (co)polymer (A) and the base oil is 0.8 to 2.0 (cal / cm3)1 / 2.

The present invention relates to the use of polyalkylmethacrylate polymers for improving the outgassing properties of functional fluids.

The invention relates to an oil composition special for a low-viscosity manual transmission. The viscosity grade of the composition is not higher than 75 W, and the oil composition is prepared from the following components in percentage by mass: 0.05-2% of at least one friction modifier, 1-10% of at least one extreme-pressure antiwear agent, 0.1-15% of at least one purification dispersant, 0.5-5%of at least one antioxidant, 0.01-1% of at least one metal deactivator, 0-1000 ppm of an antifoaming agent, 0.5-10% of viscosity index improver, and the balance of synthetic base oil and / or mineral base oil. The oil composition special for the low-viscosity manual transmission is specially developed for the manual transmission with the high fuel economy requirement, obtained lubricating oil has excellent extreme-pressure antiwear performance, shear stability performance, oxidation stability performance and shows up excellent fuel economy on the basis of meeting the low-viscosity requirement, and the oil composition is suitable for lubricating the manual transmission with the high fuel economy requirement or a new energy vehicle reduction box.

The invention relates to a poly alkyl(meth)acrylate polymer comprising a combination of polybutadiene-based monomers having different average molecular weight, lubricant compositions comprising the polymer, a method for manufacturing the polymer and the use of the polymer as a viscosity index improver in a lubricating oil composition.

The invention relates to multi-use universal aviation grease and a preparation method thereof, in particular to multi-use universal aviation grease with a boric acid thickener and a preparation method thereof. The multi-use universal aviation grease can be more widely used in the field of aviation lubrication as the performances of high-temperature bearing life, extreme pressure abrasion resistance, shear stability and the like are better and other performances can meet the related standard requirements.

A lubricating oil composition for a continuously variable transmission contains at a specific content: (A) a mineral oil or PAO having a sulfur content of 0.03 mass % or less and a kinematic viscosity at 100 degrees C. from 1.5 mm2 / s to 3 mm2 / s; (B) a mineral oil or PAO having a sulfur content of 0.03 mass % or less and a kinematic viscosity at 100 degrees C. from 5.5 mm2 / s to 8 mm2 / s; (C) PAO having a kinematic viscosity at 100 degrees C. from 30 mm2 / s to 400 mm2 / s; and (D) a polymethacrylate having a mass average molecular weight of 10000 to 40000, in which the total content of the components (C) and (D) is 19 mass % or more and the lubricating oil composition has a kinematic viscosity at 100 degrees C. from 5.5 mm2 / s to 6.5 mm2 / s and a kinematic viscosity at −20 degrees C. of 680 mm2 / s or less.