5results about How to "High shear stability" patented technology

The present application relates to the technical field of hydraulic transmission oil, and particularly relates to a hydraulic transmission oil composition with high shear stability and a preparation method thereof. The hydraulic transmission oil composition comprises the following components in parts by weight: base oil 85-99 parts, composite additive 0.1-5 parts, viscosity index improver 1-10 parts, pour point depressant 0.1-2 parts, and anti-foaming agent 0.001-0.1 part. The base oil is at least one of type I, type II and type III base oil. The viscosity grade of the base oil is No. 4, No. 6 or No. 8. The hydraulic transmission oil composition has high shear stability, good low-temperature performance, good copper strip corrosion resistance and good rust prevention, and can be used in vehicle hydraulic couplings and hydraulic torque converters, and can also be used in the hydraulic transmission system of engineering machinery.

The application discloses a split type shearing ram for blowout preventer, which comprises an upper shearing ram assembly and a lower shearing ram assembly. The upper shearing ram assembly comprises an upper shearing ram body, an upper shearing cutter body and a first clamping plate. The upper shearing cutter body is in concave-convex cooperation with the upper shearing ram body and is connected through a fastening screw. The upper shearing ram body is connected with a first ram shaft through the first clamping plate. The lower shearing ram assembly comprises a lower shearing ram body, a lower shearing cutter body and a second clamping plate. The lower shearing ram body is in concave-convex cooperation and sliding connection with the upper shearing cutter body. The lower shearing cutter body is in concave-convex cooperation with the lower shearing ram body and is connected through a fastening screw. Meanwhile, the cutting edge of the lower shearing cutter body corresponds to the cutting edge of the upper shearing cutter body. The lower shearing ram body is connected with a second ram shaft through the second clamping plate. The first ram shaft and the second ram shaft are located on the same horizontal line. The application has low maintenance cost, good shearing stability, reliable connection, convenient disassembly and assembly and strong shearing capacity.

The invention relates to the technical field of asphalt modification, in particular to low-carbon high-stability modified asphalt and a preparation method thereof.The low-carbon high-stability modified asphalt comprises matrix asphalt, a low-carbon high-stability asphalt modifier, a stabilizer and an accelerant, the doping amount of the low-carbon high-stability asphalt modifier is 2-10 wt% of the matrix asphalt, the doping amount of the stabilizer is 0.2-0.3 wt% of the matrix asphalt, and the doping amount of the accelerant is 0.75-1.75 times of the doping amount of the stabilizer. According to the prepared modified asphalt, the needle penetration is remarkably reduced, the softening point is improved, and the rotary viscosity at 135 DEG C in the aspect of constructability is excellent. The prepared modifier can effectively improve the high-temperature stability and creep resistance of asphalt, so that a green, high-performance and sustainable asphalt binder is produced. In addition, harmless and resource utilization of the waste rubber bands is achieved. The cost of the modified asphalt is reduced, and the dual purposes of environmental protection and economic benefits are achieved.

The invention discloses ultralow-temperature zinc-free hydraulic oil for engineering machinery, which is prepared from the following raw material components in percentage by mass: 57 to 85 percent of II-type base oil, 5 to 30 percent of III-type base oil, 9 to 18 percent of viscosity index improver and 0.4 to 2.7 percent of other additives, and the sum of the contents of the raw materials is 100 percent. The kinematic viscosity of the zinc-free hydraulic oil at 40 DEG C is 41.4-50.6 mm < 2 > / s, the viscosity index is higher than 200, the pour point is lower than-45 DEG C, and the zinc-free hydraulic oil can provide excellent startability, high-temperature detergency, wear resistance and winter-summer universality for an engineering machinery hydraulic system in a low-temperature environment in winter.

The invention relates to the technical field of hydraulic transmission oil, in particular to a hydraulic transmission oil composition with high shear stability and a preparation method thereof. The hydraulic transmission oil composition comprises the following components in parts by weight: 85-99 parts of base oil, 0.1-5 parts of a composite additive, 1-10 parts of a viscosity index improver, 0.1-2 parts of a pour point depressant and 0.001-0.1 part of an anti-foaming agent, the base oil is at least one of I type base oil, II type base oil and III type base oil; and the viscosity mark of the base oil is No.4, No.6 or No.8. The hydraulic transmission oil composition is simple in preparation method, not only has high shear stability, but also has relatively good low-temperature performance, copper sheet corrosion resistance and anti-rust performance, can be used for a hydraulic coupler and a hydraulic torque converter of a vehicle, and can also be used for a hydraulic transmission system of engineering machinery.