14results about How to "Reliable workmanship" patented technology

The invention discloses a method for low-temperature rapid catalytic degradation of silicone rubber, and belongs to the technical field of resource utilization of waste silicone rubber. According to the method, trifluoromethanesulfonic acid (HOTf) and metal halide zinc chloride are adopted to construct a concerted catalysis system, so that breakage and cyclization of a siloxane main chain can be realized within 10-20 minutes at the low temperature of 25 DEG C, and a siloxane product with octamethylcyclotetrasiloxane (D4) and cyclopentasiloxane (D5) as main components is generated. Compared with an existing Lewis acid system, the synergistic system still shows remarkably improved degradation rate and higher cyclization selectivity under a low-temperature condition. The method provided by the invention is suitable for linear, cross-linked and filler-containing waste silicone rubber, the process is mild and safe, the operation is convenient, and the obtained siloxane product can be directly used for regeneration and cyclic utilization of an organic silicon material.

The invention relates to a precious metal three-way catalyst as well as a preparation method and application thereof. The precious metal three-way catalyst comprises an alumina carrier, a cerium-zirconium solid solution and an active component M1, metal M2 is also loaded on the alumina carrier; the cerium-zirconium solid solution covers the surface of the alumina carrier, and the active component M1 is dispersed on the surface of the cerium-zirconium solid solution; the active component M1 comprises any one or a combination of at least two of Rh, Ir or Ru; the metal M2 comprises a combination of at least two of Pd, Pt, Rh or Au; the active component M1 and the metal M2 comprise at least three different elements. The noble metal three-way catalyst provided by the invention is used for degrading CO, NOx and CH3OH in an equivalent combustion mode, and is good in low-temperature activity, good in hydrothermal stability, relatively small in performance difference after hydrothermal aging, and wide in application prospect.

The invention provides a preparation and analysis method of a hot-dip Zn-Al-Mg alloy coating, and belongs to the technical field of metal surface coating. The preparation method comprises the steps of steel strip pretreatment, hot dipping and post-plating treatment, and an alloy plating layer with a uniform structure is obtained by controlling parameters of all working procedures; the invention also provides a matched coating analysis method which comprises the following steps: performing phase analysis by adopting an X-ray diffractometer, and performing quantitative characterization on the microscopic structure of the coating by adopting a scanning electron microscope in combination with image analysis software. The corrosion resistance of the coating is remarkably improved by increasing the content of Al and cooperatively adding Mg and Si, the microstructure characteristics of the coating are revealed through analysis, a theoretical basis is provided for component optimization and process control, and industrial application prospects are achieved.

This utility model discloses an expansion tank bracket for commercial vehicles, including a circular tube beam as the main support beam; multiple sheet metal brackets are fixed to the circular tube beam by welding; the sheet metal brackets together constitute the expansion tank fixing structure and are bolted to the cab mount. The invention employs a circular tube-sheet metal structure and welding to form an expansion tank bracket, which is then bolted to the cab mount. The advantages of this invention are its simple structure, reliability, high strength, and ability to effectively prevent bracket cracking caused by expansion tank vibration.

The invention relates to the technical field of artificial joint prostheses, in particular to a polyethylene composite molded artificial joint friction liner and a preparation method thereof, and the method comprises the following steps: firstly, respectively manufacturing a high-crosslinking blank and a non-crosslinking blank, and enabling the high-crosslinking blank and the non-crosslinking blank to have matched contact interfaces; then putting the two parts into a mold consisting of an inner mold and an outer mold according to a position relationship, and ensuring that all contact surfaces are matched and butted; then carrying out mold pressing treatment, firstly applying initial pressure at low temperature, then heating to 150-250 DEG C and boosting to 10-20 MPa for hot-pressing compounding, so that a non-crosslinking part is molten and is integrated with a high-crosslinking part at an interface; and finally, cooling, demolding and machining to obtain a finished product. The friction surface of the prepared friction liner is made of a high-crosslinking material, the friction liner is endowed with excellent wear resistance, the base body of the friction liner is made of a non-crosslinking material, excellent mechanical strength and toughness are provided, and the technical problem that wear resistance and impact resistance of an artificial joint are difficult to consider at the same time is perfectly solved.

The application discloses a preparation method of a double-layer protective coating with a self-repairing feature, and aims at solving the problems of low bonding strength of a high-entropy alloy coating and a base body and difficulty in maintaining long-time service stability. The preparation method comprises the following steps: (1) base body pretreatment; (2) calculating the average atomic radius difference, VEC, mixing entropy and mixing enthalpy of a high-entropy alloy multi-element system, and mixing and ball milling corresponding single-element powders; (3) adopting a high-energy beam deposition process to perform cladding deposition on the mixed metal powders; (4) polishing, polishing and cleaning the high-entropy alloy coating; and (5) adopting an oxidation process or a nitriding process to form an oxidation layer or a nitriding layer on the high-entropy alloy coating in situ. The double-layer protective coating with the self-repairing feature has the double-layer protection of the high-entropy alloy coating with excellent corrosion resistance and the in-situ oxidation / nitriding layer, wherein the high-entropy alloy coating is designed to utilize the dilution of the base body to form stable intermetallic compounds and improve the matching of the coating and the base body.

The application discloses a semiconductor device structure, a preparation method thereof and a semiconductor device. The semiconductor device structure comprises: an active region arranged on a substrate; a contact hole arranged on the active region; and a doped semiconductor layer filled in the contact hole, wherein the doped semiconductor layer has a recess structure on a top surface thereof, and the recess structure increases a contact area on the top surface of the doped semiconductor layer. The application increases the doping concentration of the doped semiconductor layer to be higher than a conventional doping concentration, so that the doped semiconductor layer forms filling defects when being filled, and the recess structure is formed on the top surface, thereby significantly increasing the contact area, greatly reducing the contact resistance and the resistance of the contact hole itself, significantly reducing the overall resistance of a circuit, reducing RC delay, reducing power consumption, enhancing signal integrity, prolonging service life, and being beneficial to further miniaturization of the device.

The present invention provides a BHET purification method, which comprises: mixing a BHET-containing mixture with a solvent to obtain a BHET solution to be purified, and carrying out filtration treatment to obtain a filtrate; the filtrate passes through a resin bed layer at the flow speed of 2-10 BV / h for purification treatment, and BHET purified liquid is obtained; the resin bed layer comprises H-type gel cation exchange resin, OH-type gel anion exchange resin and a solvent, at least part of the surface of the H-type gel cation exchange resin contains sulfonic acid groups and H < + >, and at least part of the surface of the OH-type gel anion exchange resin contains quaternary ammonium groups and OH <->; the volume ratio of the H-type gel cation exchange resin to the OH-type gel anion exchange resin is 1: (1-5). The method can be used for removing metal ion impurities and inorganic impurities.

The present application relates to the technical field of EVA production waste heat recovery, and is a device and method for recycling low-pressure steam by-produced during EVA production, which comprises the following steps: when EVA products with VA content are produced, a screw type steam compressor is used to compress low-pressure steam with a pressure lower than 0.45 MPag to 0.45 MPag; when EVA products with high VA content are produced, a screw type steam compressor is used to compress mixed low-pressure steam to 0.45 MPag. When the steam by-produced from the hot water system of the EVA production device is compressed by using a compression device, the present application can maximize the volumetric efficiency of the screw type steam compressor by mixing the two by-produced streams with a large flow difference before compression, so as to achieve the purpose of energy saving; and compared with the comparative example, the present application has better energy saving benefits, investment recovery rate and standard coal saving rate.

The invention provides a preparation method of environment-friendly plastic woven cloth for high-value utilization of green reclaimed materials, and relates to the technical field of plastic woven cloth. According to the formula of the environment-friendly plastic woven fabric for high-value utilization of the green reclaimed material, the formula comprises the following components in parts by mass: 80-95 parts of a reclaimed polypropylene matrix material; 2-8 parts of a reinforcing agent which is selected from one or a combination of two of polypropylene or high-density polyethylene; wherein the melt index of the PP ranges from 3 g / 10 min to 8 g / 10 min, and the melt index of the HDPE ranges from 0.1 g / 10 min to 2.0 g / 10 min; the compatilizer is selected from one or more of maleic anhydride grafted polypropylene, maleic anhydride grafted polyethylene and ethylene-octylene copolymer grafted maleic anhydride. According to the process, impurities can be removed, the mechanical performance of the product is close to or even superior to that of a raw material, meanwhile, the added value of the product is greatly improved, the application range is widened, the regenerated material can meet high strength and special requirement scenes, in addition, energy consumption can be reduced, carbon emission is reduced, and the process is energy-saving, environment-friendly and very low in cost.

This utility model relates to the field of coating thickness testing technology, and in particular to a thickness testing device applicable to different coatings. The device includes a housing and a thickness testing control structure mounted on the housing. The thickness testing control structure includes a sensing module, a non-magnetic material processing module, a magnetic material processing module, a main control module, a power supply module, and a Bluetooth module. The power supply module provides power to the sensing module, the non-magnetic material processing module, the magnetic material processing module, the main control module, and the Bluetooth module. This utility model provides a thickness testing device applicable to different coatings, capable of testing the thickness of various coatings. This not only improves work efficiency but also ensures product quality and reduces waste and losses caused by traditional testing methods.

The utility model provides a side slope anti-scour structure which comprises a transverse protection ditch, and the transverse protection ditch comprises a transverse main ditch, a plurality of side water guide ditches connected with the transverse main ditch and distributed at intervals, and a slope surface water guide ditch located on a slope surface and connected with the side water guide ditches; and the longitudinal protection slope comprises a protective layer. According to the side slope anti-scouring structure, double protection measures of the transverse protection ditch and the longitudinal protection slope are taken, construction is easy, the technology is reliable, scouring damage of rainwater to a weak side slope can be fundamentally reduced, the side slope collapse risk is reduced, the production safety of an open pit in the rainy season is improved, and the slope cutting and load shedding cost is saved.

The application provides a cable sheath, a preparation method thereof and a cable. The cable sheath comprises a three-layer structure arranged in sequence from inside to outside: a core layer comprising a porous framework, a liquid metal and an encapsulation layer, the liquid metal forming a continuous conductive network; a middle layer comprising a light-curable elastic polymer matrix, microcapsules and reinforcing particles; and an outer protective layer comprising a light-curable stimulus-responsive polymer matrix and functional nanomaterials, at least one of the heat conduction performance and the electromagnetic shielding efficiency of the outer protective layer being capable of changing according to changes in the external environment, the core layer, the middle layer and the outer protective layer being covalently bonded through an interfacial compatibilizer and integrated light curing. The cable sheath can realize mechanical strength self-healing and electrical self-healing after mechanical damage, and self-adaptive adjustment to changes in the external temperature and electromagnetic field environment, and the layers of the cable sheath are covalently bonded, so that the interlayer bonding force is strong and the structure is stable.

The application discloses an inner heat type palladium membrane purifier, which comprises an outer shell and an inner shell, a heat preservation layer is filled between the outer shell and the inner shell, the inner shell comprises a diffusion chamber and a preheating chamber, the palladium membrane purifier further comprises a heating pipe which is inserted into the diffusion chamber, the heating pipe is internally provided with an electric heating element, a palladium alloy pipe is spirally wound outside the heating pipe, one end of the diffusion chamber is provided with an end face flange, the end face flange is provided with a pure hydrogen interface and a tail gas interface, the pure hydrogen interface is communicated with the diffusion chamber and the outside of the outer shell, the tail gas interface is connected with one end of the palladium alloy pipe, the other end of the palladium alloy pipe is connected with a raw material gas preheating coil pipe, the other end of the preheating coil pipe is extended out of the outer shell and is provided with a raw material hydrogen interface, and the palladium membrane purifier further comprises a temperature measuring sleeve pipe. The hydrogen purifier disclosed by the application has the advantages of compact layout, small device volume, few welding points of a palladium membrane assembly, reliable process, long service life, uniform heating temperature of the device, small heat loss, high purification and separation efficiency of hydrogen, and large gas processing capacity per unit volume.