33results about How to "Reduce the amount of particles" patented technology

The invention discloses a single-component extrusion molding conductive rubber for electromagnetic shielding and a preparation method of the single-component extrusion molding conductive rubber, belonging to the technical field of electromagnetic shielding materials. The single-component extrusion molding conductive rubber is composed of dendritic silver coated copper powder, silvered glass fiber, polydimethylsiloxane containing vinyl by rubber base body, reinforcing agent gaseous phase white carbon black, alkynol inhibitor, metal platinum catalyst, and cross-linking agent methylhydropolyorganosiloxane. The preparation method comprises the following steps: pretreatment is carried out to the dendritic silver coated copper powder and the silvered glass fiber through amido coupling agent methyl organodisilane according to the formula, the rubber base body and the gaseous phase white carbon black are added in a vacuum kneading machine, are mixed uniformly and are added in a double-planet mixing plant, and then the alkynol inhibitor, the metal platinum catalyst and the treated electric conduction powder are mixed uniformly to form a component 1; the treated electric conduction powder is added in a cross-linking agent and is mixed uniformly to form a component 2; and two components in the double planets are mixed to form the single-component on-site forming electromagnetic shieldingsilicon rubber. The rubber has good shielding performance and good mechanical property.

The invention relates to a motor vehicle clutch release bearing device (1) including a rolling bearing (4) that forms a member for transmitting an axial force (F2), having a rotating ring (41; 42) and a non-rotating ring (42; 41), between which a rolling chamber (43) for rolling elements (44) is defined. The rotating ring (42; 41) provides a first radial portion (423, 4263, 48; 4112) intended to come into contact with an actuating member (3) when a sufficient axial force (F2) is applied to the non-rotating ring (41; 42) by a member (2) that is able to move in translation, and a second radial portion (424, 4271; 4114) that is intended to bear against a spring (5), which exerts an axial force (F5) in the opposite direction to the axial force (F2) exerted by the member (2) that is able to move in translation, dedicated to preloading the rolling bearing in an opposite direction to the actuating member (3).

The invention discloses a fuel additive, which is prepared from the following raw materials in parts by weight: 10 to 20 parts of aluminum oxide, 20 to 30 parts of iron trioxide, 10 to 15 parts of methylcyclopentadiene tricarbonyl manganese, 5 to 10 parts of antioxidants, 11 to 18 parts of antistatic agents, 12 to 20 parts of sodium benzene sulfonate, 0.5 to 1.5 parts of non-metallic nanometer quantum dot compound additives, 10 to 25 parts of hydrocarbon compounds and 5 to 10 parts of acrylic graft modified acrylic resin. The invention also discloses a preparation method of the fuel additive.The preparation process is simple; when the prepared fuel additive combusts together with fuel oil, the smoke dust quantity of the discharged smoke can be effectively reduced; the free carbon particlequantity and the CO discharge quantity are reduced; meanwhile, the oil saving rate is greatly improved.

The invention provides a flaky metal powder by screening-ball milling method and a preparation method thereof, the preparation method of the flaky metal powder by the sieving-ball milling method comprises the following steps: Sieve into metal powders with different meshes; the metal powders are put into the ball milling equipment together with ball milling steel balls and metal powder surface treatment additives according to different meshes, vacuumize, fill with nitrogen, and carry out step by step according to different meshes Ball milling, the ball milling time is adjusted according to the particle size of the sieved metal powder; the ball milled powders of all levels are collected and classified again by airflow classification. Adopting the technical scheme of the present invention, the thickness of the flake metal powder obtained is uniform; the output of overgrinded metal powder can be greatly reduced, and at the same time, the slightly coarser metal particles after grinding are less and can be reground into qualified products. High, the yield rate can reach up to 100%, and the production efficiency is good.