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

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 relates to a composite of food-grade compound calcium sulfonate-base lubricating grease and a preparation method of the composite. The preparation method comprises the following steps of: feeding mixture of 40-60% synthesized calcium sulfonate with high base number, water and ethanol into a reaction kettle, stirring and heating to 60-80DEG C, adding 0.5-2% of acetic acid to convert calcium carbonate with a calcite structure, adding 1-5% of calcium hydroxide and 2-5% of stearic acid under 90-100 DEG C after 1h of constant temperature, carrying out saponification reaction for 120min, rising temperature after saponification, adding 1-5% of calcium borate after 1h of 130-140 DEG C constant temperature, rising the temperature to 180-200DEG C keeping constant temperature for 5-10min, cooling the temperature to 100-110DEG C, adding 0.2-1.5% of antioxygen, homogenizing, adjusting thickness by adding base oil, degassing in a filtering way, and filling to form finished products. The dropping point of the composite provided by the invention is more than 300DEG C, the 0.1-milliom times shear difference value is within 20, and the PD (potential difference) value is not less than 400kg.

The invention provides a tetra-urea lubricating grease and a preparation method thereof. The tetra-urea lubricating grease comprises lubricating oil basic oil and a tetra-urea thickening agent, and does not contain di-urea thickening agent and fatty acid metal salt. In the preparation method, the tetra-urea lubricating grease is obtained by the reaction of diisocyanate, diamine and monoamine. Compared with the di-urea lubricating grease, the tetra-urea lubricating grease has higher dropping point, better extreme pressure property, colloid stability and shearing stability.

The invention discloses a modified SiO2 lubricating grease and a preparation method thereof. The modified SiO2 lubricating grease comprises the following components by mass: 8-12% of a thickening agent, 45-65% of base oil, and 3-5% of a modifier. The thickening agent is industrial SiO2, the base oil is NBR silicone oil, dimethicone and PAO-40 oil, and the modifier is silanol. The preparation method includes: putting 45-65% of base oil into a reaction kettle, raising the temperature to 155-160DEG C, adding 3-5% of the modifier, further raising the temperature and fully mixing the materials to make the modifier fully dissolved in the base oil; and when the temperature is raised to 160-165DEG C, adding 8-12% of the thickening agent, stirring the mixture uniformly, and carrying out oil rolling by a three-roller grinding mill, thus obtaining the modified SiO2 lubricating grease. According to the invention, the industrial product SiO2 with small particle size, large specific surface area and controllable surface is adopted as the thickening agent, thus facilitating quick formation of a grid structure and reaching a new equilibrium state. Thus, the obtained SiO2 lubricating grease has good storage stability and shear stability. By using silanol as the modifier, the compatibility of SiO2 particles and the base oil is enhanced.

The invention discloses a viscosity index improver for recombined type lubrication oil. The improved viscosity index improver for the lubrication oil is at least composed of the following components by weight: 0.1-30% of an ethylene-propylene copolymer (Olefin Copolymer, OCP), 0.1-30% of a styrene or styrene / conjugated diene (butadiene, isoprene) polymer (HSD) and 40-99.8% of base oil, wherein the olefin copolymer is grafted or mixed with a styrene or hydrogenated styrene / conjugated diene polymer. The olefin copolymer is grafted or mixed with the styrene or hydrogenated styrene / conjugated diene polymer; thickening capacity, shearing stability and low temperature viscosity of the viscosity index improver can be effectively improved through hydrocarbon recombination of the above two materials; at the same time, a viscosity index improver-adding amount can be greatly reduced; and production cost is reduced.

The invention relates to a lubricating grease for shear-resistant bearings, and a preparation method thereof. The preparation method comprises the following steps: adding diphenylmethane diisocyanateand a part of base oil into a reaction kettle A according to a ratio of a polyureido group to a lithium base being 1:8 to 1:10, heating the reaction kettle to 50 DEG C, adding two amines molten by a part of the base oil after the diphenylmethane diisocyanate is completely molten, carrying out a reaction, heating the reaction kettle A to a refining temperature of 90 DEG C, keeping the temperature unchanged for 1 h, adding the remaining base oil and all 12-hydroxystearic acid into a reaction kettle B, heating the reaction kettle to 80 DEG C, pouring the obtained mixture into the reaction kettleA after the 12-hydroxystearic acid is completely molten, and dropwise adding an aqueous solution of LiOH into the reaction kettle A to carry out saponification for 0.5 h; adding 0.1% of water after the saponification is finished, and heating the reaction kettle A to 185 DEG C; and keeping the temperature unchanged for 1-2 h, adding an antioxidant, naturally cooling the reaction kettle to 85 DEG C,adding other additives, uniformly stirring above substances, carrying out rolling oil fine filtration, and filling the finished degassed finished product.

The invention relates to the lubricating grease technical field, and particularly relates to an automobile seat motor regulator lubricating grease formula and a preparation process thereof. The lubricating grease is prepared from the following components by the weight percentage: 55-80% of poly-alpha-olefin synthetic oil, 8-20% of a lithium soap powder, 5-15% of liquid silica gel, 3-8% of a solid additive, 0.5-3% of an antioxidant, 0.1-5% of an anti-wear and extreme-pressure agent, and 1-3% of an anti-rust agent. Compared with the prior art, the lubricating grease has the beneficial effects of extremely small friction coefficient, excellent bearing capacity, excellent wear resistance, wide range of operation temperature, extremely low evaporation loss and diffusivity, excellent oxidation resistance stability, excellent shear stability, excellent mechanical stability, extremely long service life, excellent anti-water and anti-corrosion abilities, excellent vibration attenuation, excellent noise reduction, and good compatibility with the vast variety of plastics and elastic colloids.

The invention relates to a modified composite calcium sulfonate lubricating grease and a preparation method thereof. The percentage by weight of each component of the composition raw material of modified composite calcium sulfonate grease of the present invention is: (A) high alkali value calcium sulfonate 25-40%wt%; (B) conversion agent 2-7wt%; (C ) calcium hydroxide 1.5-4wt%; (D) lithium hydroxide monohydrate 0.5-1.5wt%; (E) dibasic acid 6-15wt%; (F) lauryl hydroxystearic acid 4-11wt%; (G ) Modifier 1-5wt%; (H) antioxidant 0.3-1wt%; (I) base oil, balance, wherein the sum of each component is 100wt%. The modified composite calcium sulfonate grease has outstanding high temperature performance, good shear stability, excellent water resistance and extreme pressure performance, and good adhesion performance, which can meet the lubrication requirements under harsh conditions such as high temperature, high load, water and dust. . The invention also relates to a preparation method of the modified composite calcium sulfonate lubricating grease.

The invention relates to novel composite calcium-based lubricating grease and a preparation method thereof. The novel composite calcium-based lubricating grease is prepared from, by weight, 50-80% ofa base liquid, 20-40% of a novel composite calcium-based composite calcium soap thickening agent and 0.1-5% of a function improvement additive. The novel composite calcium-based lubricating grease ischaracterized in that the novel composite calcium-based thickening agent is adopted, a calcium phenylborate-calcium phosphate component is introduced to improve the friction and wear resistance and the antioxidant stability of the composite calcium-based thickening agent and improve the storage hardening problem of the composite calcium-based lubricating grease, and meanwhile, the characteristicsof excellent extreme pressure wear resistance, mechanical stability, water resistance and the like of the composite calcium-based thickening agent are fully utilized, so that the prepared novel composite calcium-based lubricating grease can meet the use requirements of high temperature, high speed, high reliability and long service life of the hub bearing of the heavy-duty vehicle.