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 multi-component powder for consolidation to form a sinterable green body for a zirconia ceramic is described. The multi-component powder comprises at least 80% by volume of nano-sized particles of zirconia and up to 20% by volume of a stabilising agent which may form a coating around the nano-sized particles of zirconia and is optionally in particulate form. A multi-component slurry formed by suspending the powder in a liquid is also described as well as a green body formed from either the slurry or the powder. A zirconia ceramic formed by sintering the green body is also described.

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 disclose a wear-proof material welding method. The wear-proof material welding method aims to solve the problem that in the prior art, a wear-proof layer formed by tungsten carbide of asingle ingredient is welded to the surface of a blade of a steel base material is prone to disengagement from the steel base material. The wear-proof material welding method comprises the steps that firstly, the surface of the blade is cleared; secondly, a nickel-based wear-proof alloy is molten on the surface of the blade with a powder plasma arc cladding technology, hard tungsten carbide alloy particles are added, and layer-by-layer surfacing is conducted, wherein the hard tungsten carbide alloy particles are evenly inlaid in the wear-proof layer, and the weight ratio between the hard tungsten carbide alloy particles and the nickel-based wear-proof alloy material is 40%-60%. The wear-proof material welding method applies the (WC+Ni60) mixed wear-proof material powder plasma arc surfacingtechnique to manufacturing of the blade and other wear-proof materials, so that the wear-proof layer is resistant to impact, and the blade especially can meet the use requirements of a power mixing machine.

The invention relates to a pipeline outer anticorrosion layer protective material. The pipeline outer anticorrosion layer protective material comprises a protective layer covering a pipeline and putty systems which are arranged on two ends of the protective layer, wherein the protective layer comprises a resin system and a fiber reinforcement; the resin system comprises E51 epoxy resin, E44 epoxy resin, modified fatty amine curing agent, low-molecular polyamide curing agent, 2,4,6-tris(dimethylaminomethyl) phenol accelerant, 2-ethyl-4methylimidazole accelerant and polymer epoxypropane butyl ether active diluting agent; the fiber reinforcement is ultrahigh-molecular-weight polyethylene fiber, carbon fiber, glass fiber, basalt fibers and a fabric made of the fibers, and the fabric is nonwoven cloth or unidirection cloth, plain cloth, twill and satin weave cloth; each putty system comprises E51 epoxy resin, E44 epoxy resin, modified fatty amine curing agent, low-molecular polyamide curing agent, 2-ethyl-4methylimidazole accelerant, silane coupling agent KH550, flexibilizer CYH-277 and glass beads. The pipeline outer anticorrosion layer protective material has the characteristics of scratch resistance, bending resistance, excellent impact resistance and convenience in construction.

The invention relates to a high-toughness flame-retardant nylon material and a preparation method thereof. The nylon composite material comprises, by weight, 50-60 parts of nylon resin, 30-40 parts ofglass fibers, 15-25 parts of DOPO-based nitrogen and phosphorus flame retardants, 5-10 parts of main toughening agents, 2-5 parts of auxiliary toughening agents, 0.5-1 part of thermotropic liquid crystalline polymers and 0.5-1 part of antioxidants. The main toughening agents are provided with soft-core and hard-shell type core-shell copolymers, the auxiliary toughening agents are one or more of polybutylene succinate, polyepsilon-caprolactone and ethylene-vinyl acetate copolymer. The high-toughness flame-retardant nylon material is excellent in mechanical properties such as bending modulus, bending strength and notch impact strength, and the flame-retardant grade of a standard UL 94 testing product reaches V0.

The invention discloses a fabricated beam-column connecting joint. The fabricated beam-column connecting joint comprises a prefabricated concrete column, a prefabricated concrete beam and an energy dissipation assembly, wherein the energy dissipation assembly comprises a bending-resistant assembly, a shearing-resistant assembly, a first connecting plate and a second connecting plate, the bending-resistant assembly is in a hollow pipe shape, and the shearing-resistant assembly is arranged in the bending-resistant assembly; the first connecting plate and the second connecting plate are connected to the two ends of the anti-bending assembly through the inner sides correspondingly, the two ends of the anti-shearing assembly are fixedly connected with the inner sides of the first connecting plate and the second connecting plate correspondingly, the outer side of the first connecting plate is detachably connected with the side face of the prefabricated concrete column, and the outer side of the second connecting plate is detachably connected with the end face of the prefabricated concrete beam. The fabricated beam-column connecting joint is simple in structure, the energy dissipation assembly can serve as an integral component to be installed or disassembled, installation and operation are convenient, the assembly degree is high, the energy dissipation assembly can be rapidly replaced after an earthquake, and the prefabricated concrete column and the prefabricated concrete beam can be effectively protected against damage under the action of a strong earthquake.

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.

This invention declares a gelled mortar dissected composite pipe with glass fiber reinforced plastic inner covering and outer protective layer. There is an alkali-stimulated inorganic gelled sand-doped layer between the mentioned glass fiber reinforced plastic inner covering and outer protective layer. This invention has a high tensile strength, compressive strength, bending strength and fracture elongation, also has high resistance to leakage and corruption.

The invention relates to a wiring pile head convenient to manufacture in a batched mode and belongs to the field of power supply. A porcelain insulator is composed of an upper porcelain insulator assembly and a lower porcelain insulator assembly which are buckled in an up-and-down split mode. An upper porcelain insulator body penetrates through a wire outlet open hole from the outer portion of a box body and is connected with a lower porcelain insulator body located in the box body in a plugging mode, and the upper porcelain insulator body and the lower porcelain insulator body are buckled into a whole. Central penetrating holes are formed in the upper porcelain insulator body and the lower porcelain insulator body, an integrated conductive copper bar is arranged in the central penetrating holes, penetrates through a rainproof cap, passes through the central penetrating holes of the upper porcelain insulator body and the lower porcelain insulator body and then penetrates out of the central penetrating hole of the porcelain insulator body, the part, forming an external wiring terminal, of the conductive copper bar and the rainproof cap are welded and fixedly connected into a whole, a threaded structure is formed in the part, forming an inner wiring terminal of the box body, of the conductive copper bar, and a locking nut is arranged between the conductive copper bar of the inner wiring terminal and the lower porcelain insulator body. The conductive copper bar drives the rainproof cap to fix the upper porcelain insulator body and the lower porcelain insulator in the wire outlet open hole by screwing the locking nut.

The invention discloses a method for preparing a wood plastic composite from bean dregs. The method comprises the following steps: bean dreg powder is degreased and modified through hot alkali treatment, a product is then mixed uniformly with plant fiber powder, thermoplastic, a compatilizer, inorganic mineral powder and a lubricant, the materials are subjected to hot-melt mixing at 150-180 DEG C, the mixture is subjected to hot pressing and cold pressing finally, and the wood plastic composite is obtained. The wood plastic composite is prepared through degreasing, alkaline hydrolysis modification of the bean dregs, addition of the plant fiber powder, high-temperature melting and high-pressure treatment process for the first time, so that the performance of the wood plastic composite is improved substantially, market requirements and standards can be met, the wood plastic composite has low energy consumption and cost, produces little pollution and is simple to operate, and one feasible way is provided for optimization of the performance of the bean dreg based wood plastic composite.

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 discloses cemented carbide powder used in production of nozzles, and a preparation method thereof. The cemented carbide powder comprises the following raw materials of WC, Ni, TiC, Co, Cr2C3 and TaC; the preparation method of the cemented carbide powder comprises the following steps: S1, weighting the raw materials for standby; S2, adding the raw materials weighted in S1 into a ball grinder, and using alcohol as a grinding media for performing ball mill; S3, drying powder subjected to ball mill by using a vapor dryer, and then adding adhesive Buna after drying; S4, again drying the power added with the adhesive Buna in S3, screening after drying to prepare the cemented carbide powder. According to the invention, the shortage of cobalt and tungsten resources in the world is effectively alleviated, and threat to human health caused by the fact that in the use process of the cemented carbide, cobalt can be oxidized to generate toxical Co6+; compared with nozzles produced by a traditional sintering process, the nozzles produced by using the cemented carbide powder provided by the invention have characteristics of light specific weight, high hardness, low cost, safety and environmental protection, and can meet quality requirements on bending strength.

The present invention includes a novel shapeable material or resin, specifically for dental use. It is an improvement over conventional dental resins because it is strong, safe, does not encourage the propagation of bacteria and contains no bisphenol A (BPA). Also, it is the preferred resiliency for use in the oral cavity.

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 discloses a PTT polyester flame retardation composition with excellent mechanical properties. The composition comprises the following ingredients, by weight, 60%-80% of PTT, 8%-12% of glass fibers, 2%-10% of calcium carbonate composite particles, 4%-8% of MBS, 4%-8% of flame retardants, 0.5%-2% of light stabilizing agents, 0.1%-0.5% of anti-oxidants and 0.1%-1% of lubricants. The calcium carbonate composite particles are calcium carbonate nanoparticles with surfaces after grafting of styrene and methyl acrylate dual monomers. The beneficial effects are that the PTT polyester flame retardation composition has excellent flame retardation performance and heat resistance, and also has good integrated mechanical properties of tensile strength, bending strength and impact intensity; the processability is good, the chemical resistant stability is excellent, the cost is low, and the appearance is good.

The invention discloses a switching-on structure of a grounding knife of an isolation switch. The structure comprises a grounding knife bar and a static contact, wherein the static contact comprises apipe clamp and a connecting part; the pipe clamp is connected to the connecting part; through the above arrangement, the grounding knife bar is directly clamped into the static contact, the design ofa T-shaped moving contact is canceled, the structure of the grounding knife bar is simpler, the cost is saved, the pipe clamp is used for fixed contact, the grounding knife bar is clamped into the pipe clamp, the contact area is larger, and the cooperation is good.

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 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.

The invention discloses a sol-gel method, using tetraethyl orthosilicate (TEOS) as a precursor, ammonia as a catalyst, and coating SiO on HBN through a hydrolysis reaction. 2 Preparation of HBN@SiO 2 The core-shell filler is modified hexagonal boron nitride powder. The invention also discloses the application of the modified hexagonal boron nitride powder, the HBN@SiO 2 The core-shell type filler is dispersed in the resin matrix, and after steps such as cloth gluing, cutting and lamination with copper foil, etc., it is placed in a vacuum hot press and pressed to obtain a copper clad laminate. HBN@SiO prepared by the method of the present invention 2 The core-shell powder material has excellent performance and has a very good application prospect as a high-performance copper-clad laminate filler.

The invention belongs to a soil retaining technology for digging a soil body and stabilizing slopes and provides a grouting soil nail for triangularly arranging reinforcing steel bars. The soil nail comprises reinforcing steel bars and neat cement paste bodies wrapped outside the reinforcing steel bars, wherein the reinforcing steel bars comprise main reinforcing steel bars and auxiliary reinforcing steel bars; the main reinforcing steel bars are triangularly distributed on the section of the soil nail; and the auxiliary reinforcing steel bars are enclosed into a triangle, sleeved and fixed on the main reinforcing steel bars and arranged along the length direction of the soil nail. The utility model comprises a soil nail with a certain bending resistance which has better safe stability for retaining soil. The reinforcing steel bars are triangularly arranged so as to save materials under the condition of the same weight; meanwhile, support slopes of the soil nail can be prevented from quickly collapsing and the stability of the support slopes of the soil nail can be improved; and the time and condition are created for safety evacuation and engineering emergency.