34results about How to "With bending strength" patented technology

The invention relates to a low-odor scraping-resistant polypropylene material and a preparation method of the low-odor scraping-resistant polypropylene material and belongs to the technical field of polypropylene materials. In order to solve the technical problems that the odor of the polypropylene material in the prior art is difficult to eliminate, the odor can be eliminated only through aiming at a certain single ingredient, the scraping resistance is poor, and the production cost is high when fluorine-containing polymers are adopted for production. The invention provides the low-odor scraping-resistant polypropylene material and also provides the preparation method of the polypropylene material, wherein the polypropylene material comprises acrylic resin, nanometer silicon dioxide, ultra-fine talcum powder, odor eliminating agents, disperse lubricating agents, antioxidants and hindered amine light stabilizers, the method comprises material mixing and squeezing granulation steps, and the low-odor scraping-resistant polypropylene material is obtained. The polypropylene material provided by the invention has the advantages of low odor and scraping resistance. The product obtained from the material has the advantage that the performance such as tensile strength, bending strength, cantilever beam notch impact strength and delta L is high. The method has the advantages that the process is simple, the operation is easy, raw materials are easy to obtain, and the industrial production is favorably realized.

A process for preparing the nano-class composite silicon nitride-titanium carbide ceramic in which the granularities of silicon nitride are distributed by dual peaks includes such steps as mixing Si3N4 nanoparticles and TiC nanoparticles with Si3N4 micron-particles, and sintering by segmentally raising temp and pressurizing. Its advantages are high strength, toughness, heat shock resistance and antioxidizing performance.

The invention relates to a 2D Ti3C2-MXene thin film material, a preparation method thereof and application of the material in an RRAM, and belongs to the technical fields of film preparation and microelectronic functional devices. An MXene film is prepared in the surface of a conductive substrate in a low-temperature one-step solution method, film formation is easy, and the film can be prepared ina large area more easily. The novel 2D material MXene is applied to the memory field instead of a traditional resistive switching material for the first time, the RRAM comprises a hard substrate, a bottom electrode, a resistive switching layer and a top electrode successively from bottom to top, the resistive switching layer is made of the 2D Ti3C2-MXene thin film material and in the thickness of100-450nm, a prepared device, as a nonvolatile memory, can keep the original resistive state when being powered off, and the device is kept stable after multiple continuous cycles, and is resistant to circulation.

The invention discloses a preparation method of a hard alloy pressed blank adapted to general mechanical processing. The preparation method comprises the following steps: a, preparing a pressed blank by pressing a prepared hard alloy mixture through the die-casting and isostatic pressing forming processes; and b, pre-sintering the formed pressed blank at the temperature of 810 to 880 DEG C in a vacuum sintering furnace, maintaining the temperature for 60 to 80 minutes, and then cooling to reach the room temperature after the pre-sintering. According to the preparation method of the hard alloy pressed blank, the pressed blank formed by pressing is pre-sintered; the pre-sintered pressed blank has certain hardness and bending resistance and is relatively high in pressed performance, so that the hard alloy pressed blank can be effectively cut by turning, milling, drilling, boring and other general mechanical processing for further forming before being sintered, the subsequent processing allowance of the sintered product can be greatly reduced, the processing cost can be decreased, and the processing efficiency is increased.

The invention relates to the field of medical instruments, and discloses a fixing device for infusion. The fixing device for infusion comprises a semi-barrel-shaped fixed plate, wherein the fixed plate is movably connected with a movable plate; the movable plate comprises a supporting plate and matching plates positioned on two sides of the supporting plate; an adjusting mechanism is connected between the supporting plate and each matching plate and is used for adjusting the distance between the supporting plate and the matching plate; one side of each matching plate is rotatably connected with a rotating nut; each matching plate is further fixedly connected with a threaded belt; each threaded belt is successively wound through the supporting plate and the fixed plate and is in threaded connection with a rotating nut intermittently; and the fixed plate is made of a transparent material. By the device, the problems that an existing binding band is poor in fixing effect, and an infusionportion is unlikely to observe are solved.

The invention discloses a formed body for a dental department and a resin material for a dental department. The material of the formed body for a dental department is resin material. The resin material comprises 65%-90% of polypropylene by weight, 7%-25% of polyethylene or ethylene alpha olefin copolymer by weight, 0.01%-2% of magnesium stearate by weight, 0.001%-1% of one or two of titanium oxide and ferric oxide, and 0.0001%-1% of pigment. The total content of said components is above 90%. Experimental results show that the formed body for a dental department and the resin material for a dental department disclosed in the invention are proper in bending strength, suitable for human hardness, difficult for miscellaneous bacteria breeding and high in safety. There is no resin anaphylactic reaction. Bisphenol A cannot be dissolved.

The invention discloses modified hexagonalboron nitride powder which is HBN@SiO2 core-shell type filler prepared by using a sol-gel method, taking tetraethylortho silicate (TEOS) as a precursor, taking ammonia water as a catalyst, carrying out hydrolysis reaction, and wrapping HBN with SiO2. The invention further discloses application of the modified hexagonalboron nitride powder. The HBN@SiO2 core-shell type filler is dispersed in a resin matrix, is subjected to steps of spreading and gluing, tailoring and stacking with a copper foil and the like, and then is pressed in a vacuum hot press toobtain a copper-clad plate. The HBN@SiO2 core-shell type powder material prepared by the method is excellent in performance, and has quite good application prospect as high-performance copper-clad plate.

The invention discloses a preparation method of a MoNiB metal ceramic thread element. The preparation method comprises the following steps that Mo-Ni-B metal mixed powder is prepared; a steel tubular core rod is machined; a metal mold is prepared; the steel tubular core rod is placed in the mold, and the space among a outer mold, a core mold and a lower mold is filled with the Mo-Ni-B metal mixed powder; the metal mold filled with the powder is placed into a pressure chamber of press equipment, static pressure molding is performed, and demolding is performed to form a composite molding body with the steel core hollow round rod inside and the Mo-Ni-B metal mixed powder on the outer layer; the composite forming body is machined into a thread element blank; the blank is subjected to vacuum sintering, and a finished blank is obtained; and the finished blank is subjected to finish machining, and the steel-based MoNiB composite metal ceramic product thread element finished product is obtained. The MoNiB metal ceramic thread element has ultrahigh corrosion resistance and wear resistance at the same time.

The invention discloses a combined type insulation wiring pile head used for a distribution transformer low voltage protection switch and belongs to the field of power supply. A split-type porcelain insulator of the pile head is composed of an upper porcelain insulator body and a lower porcelain insulator body, and the upper porcelain insulator body and the lower porcelain insulator body are buckled together; the upper porcelain insulator body passes through a wire-out opening from the exterior of a cabinet body and is connected in an inserted mode and buckled with the lower porcelain insulator body which is located inside the cabinet body. The upper porcelain insulator body and the lower porcelain insulator body are each provided with a central through hole, an integral conductive copper bar is arranged in the central through holes, after penetrating through a rain cap, the conductive copper bar passes through the central through hole of the upper porcelain insulator body and the central through hole of the lower porcelain insulator body in sequence, then the conductive copper bar penetrates out of the central through hole of the lower porcelain insulator body, the part, forming an external terminal block, of conductive copper bar is fixedly connected with the rain cap into a whole in a welded mode, a thread structure is arranged on the part, forming an internal terminal block, of conductive copper bar, and a lock nut is arranged between the part, forming the internal terminal block, of the conductive copper bar and the lower porcelain insulator body; by screwing the lock nut tightly, the conductive copper bar can drive the rain cap to fix the upper porcelain insulator body and the lower porcelain insulator body inside the wire-out opening.

The invention discloses a metal-free prefabricated cement sheet composite wall which comprises two parallel formworks, the two formworks are made of prefabricated fabric reinforced concrete sheets, a plurality of trapezoidal columns arranged along the wall face are arranged on the opposite faces of the two parallel formworks, and the two parallel formworks are connected through connecting pieces. The prefabricated fabric reinforced concrete thin plates are adopted to form the formworks, the thickness of the plate faces is reduced, so that transportation and building are facilitated, the construction speed is increased, and the anti-bullet and anti-explosion performance of the wall is improved by laying the multiple layers of fiber fabric nets. Through cooperation of the flat plates and the trapezoidal folded plates, the formworks on the two sides have certain bending strength and overall stability, then the connecting pieces are arranged between the formworks on the two sides of the wall for fixing, filled tamped immature soil or cemented soil and the like are restrained transversely, and therefore the vertical bearing capacity of the wall is improved.

The invention relates to a protective material for joint coating of an outer erosion resistant layer of a pipeline. The protective material comprises a protective layer which covers the outer side of the pipeline and putty systems which are arranged at the two ends of the protective layer; the protective layer comprises a resin system and a fiber reinforcement body; the resin system comprises E51 epoxy resins, 2,4,6-tri(dimethylamino methyl) phenol accelerants, polyether amine D2000, polymercaptans and polymer epoxy propane butyl ether reactive diluents; the fiber reinforcement body is ultra high molecular weight polyethylene fiber, a carbon fiber, a glass fiber, a basalt fiber and a fabric made by the fibers; the fabric is non-woven cloth, plain cloth, twills and satin weave cloth; the putty systems comprise E51 epoxy resins, 2,4,6-tri(dimethylamino methyl) phenol accelerants, polyether amine D2000, polymercaptans, polymer epoxy propane butyl ether reactive diluents, silane coupling agents, flexibilizers and glass beads. The protective material has the characteristics of short curing time, high scratch resistance, high anti-bending strength and high impact strength and is convenient for construction.

The invention relates to a manufacturing method for ground paving materials including bottom ash using a forming device, the materials being environmental-friendly and having water permeability and compression strength and durability. The forming device includes a primary mortar supply part, a secondary mortar supply part, a tertiary mortar supply part, and a forming part including a pressing unit. The method includes: a mixture supply step of supplying a mortar mixture, including bottom ash having different particle sizes, to each of the primary to tertiary mortar supply parts; a primary mortar discharge step of discharging a mixture of the primary mortar supply part; a secondary mortar discharge step of discharging a mixture of the secondary mortar supply part to stack the mixture on themixture of the primary mortar supply part; a tertiary mortar discharge step of discharging a mixture of the tertiary mortar supply part to stack the mixture on the mixtures of the primary and secondary mortar supply parts; and a forming step of pressing the mixtures of the primary, secondary, and tertiary mortar supply parts into the mold through the pressing unit of the forming part.