6results about How to "Low shear strength" patented technology

The invention discloses an optimization process for preparing hydrolysis-resistant PET (polyethylene terephthalate) master batch. The optimization process comprises the following steps: S1, pretreating raw materials; s2, low-temperature pre-dispersion: adding the dried raw materials weighed according to the formula proportion into a high-speed mixer, so that the anti-hydrolysis agent and the auxiliary agent are uniformly attached to the surface of the PET base material to form a premix; s3, mild extrusion granulation: melting and mixing the premix through a twin-screw extruder, and extruding the premix into filaments through a die head; s4, the filaments are rapidly cooled and shaped through a cooling water tank, and secondary cross-linking is avoided; s5, pelletizing by adopting a pelletizer to obtain primary master batches; s6, the primary master batch is subjected to vacuum drying, surface moisture is removed, and the anti-hydrolysis PET master batch is obtained.The thermal degradation of a PET base material and the advanced reaction of an anti-hydrolysis agent are reduced, the intrinsic viscosity of the master batch is stable, and the anti-hydrolysis efficiency is improved.

The utility model provides a kind of pull tab connecting piece and thermal superimposed wall, including the pull tab joint and single-head pull tab of being connectable, the pull tab joint is rectangular sheet, the pull tab joint is set with through-hole in one end away from the single-head pull tab, the pull tab joint is set with strip slot in another end close to the single-head pull tab, the end of single-head pull tab close to the pull tab joint is formed with protrusion, the protrusion can be connected with the strip slot clearance hook, the end of single-head pull tab away from the pull tab joint is set with mounting hole.The utility model can realize the production of low thermal conductivity and low cost material, avoid the risk of forming thermal bridge, improve the thermal performance of thermal superimposed wall.

A large-diameter retrievable bridge plug relates to the field of oil and gas production equipment technology, including a retrieval and release assembly, a locking and releasing assembly, an anchoring assembly, a sealing assembly, and a central tube. The locking and releasing assembly includes a release sleeve, a locking ring, a pull sleeve, a conversion joint, a connecting sleeve, a retrieval diameter, a break-off ring, a release sleeve, and a release pin. The locking ring is located outside the central tube, with ratchet A on its inner side and ratchet B on the outer side of the central tube below the locking ring. The downward ratchet A and ratchet B engage to limit the upward movement of the locking ring. The pull sleeve is located below the locking ring and above the rubber sleeve assembly. The setting rebound force cannot push the locking ring upward, making the setting very reliable. The locking and releasing assembly also includes a release shovel, a fixing post, and an unlocking pin. The lower inner side of the locking ring has a conical surface A, and the upper end of the release shovel has a conical surface B. The pull sleeve and the release sleeve are connected by the unlocking pin. The upper sidewall of the pull sleeve has an elongated hole, through which the fixing post passes to connect the release shovel and the release sleeve.

This application provides an extreme pressure anti-wear hydraulic oil and its preparation method. The raw materials for preparing the extreme pressure anti-wear hydraulic oil include the following components in parts by weight: 80-90 parts by weight of base oil, 2-5 parts by weight of antioxidant, 1-3 parts by weight of rust inhibitor, 0.5-1 parts by weight of pour point depressant, and 0.2-0.5 parts by weight of extreme pressure anti-wear agent; the extreme pressure anti-wear agent is obtained by mixing boronamide and ammonium phosphate ionic liquid in a weight ratio of 1:0.5-1. The preparation method includes the following steps: (1) mixing the base oil and antioxidant in parts by weight, stirring for 10-20 minutes at a temperature of 40-50℃ to obtain a first mixture; (2) adding the rust inhibitor, pour point depressant, and boronamide and ammonium phosphate ionic liquid in parts by weight to the first mixture, heating and refining to obtain the extreme pressure anti-wear hydraulic oil. This application achieves long-term stable operation of the extreme pressure anti-wear hydraulic oil under extreme pressure conditions.

The application discloses a preparation process of AlCrSiWN / Mo nano composite coating with high hardness and high wear resistance, and belongs to the technical field of coating. The process is that Mo element is doped in an AlCrSiWN high-hardness coating to form a nano composite coating by adopting arc ion plating technology; the preparation process comprises the following steps: firstly, an AlCrN transition layer with a columnar crystal structure is prepared; then, AlCrSiW and CrMo targets are simultaneously started; the evaporation current of the CrMo target is regulated to be 122-150 A; the self-lubricating property of Mo element and the high hardness property of the AlCrSiWN coating are synergistically used; the AlCrSiWN / Mo nano composite coating with high hardness and high wear resistance is obtained; the toughness and self-lubricating property of the coating are improved; the crack propagation is inhibited; and the friction coefficient is reduced.