25results about How to "Small mechanical properties" patented technology

The invention belongs to the technical field of brake friction materials and powder metallurgy, and discloses a preparation and regulation method for a three-dimensional latticed structure in a copper-based brake friction material. The copper-based brake friction material is mainly composed of copper-coated iron powder, molybdenum disulfide, crystalline flake graphite, silicon dioxide, superfine copper powder and other functional components. Wherein the three-dimensional latticed structure is constructed by superfine copper powder, and the comprehensive performance of the copper-based brake friction material is improved through multiple excellent performances such as high heat conduction performance and mechanical strength of the three-dimensional latticed structure; according to the invention, structural design and preparation are carried out on raw material powder by adopting a method of prefabricated particle preparation and particle bonding and coating, so that all functional components are uniformly distributed on the friction material, a three-dimensional latticed structure can be constructed, and the mechanical property and tribological property of the friction material are greatly improved; the copper-based brake friction material is high in mechanical performance, stable in friction coefficient, high in heat conduction performance, low in wear rate and excellent in performance under extreme working conditions.

The invention is suitable for the technical field of materials, and discloses silica gel and a preparation method thereof, and a silica gel product and a preparation method thereof. Wherein the silica gel comprises a first component and a second component, the first component comprises a base material, a reinforcing agent, a modified filler, titanium dioxide and a vulcanizing agent, and the second component comprises a base material, a reinforcing agent, a modified filler, titanium dioxide, a cross-linking agent and a polymerization inhibitor. The silica gel provided by the invention not only has better mechanical properties, but also has a small friction coefficient, when the silica gel is in contact with skin, the adhesion feeling is low, the smooth effect is good, and the smooth feeling and the skin-friendly property are improved. Moreover, two components, namely the first component and the second component, are arranged, the first component and the second component are stored separately, the material is easy to store and stable in performance, the service life of the product can be prolonged, in addition, the material preparation and forming process is simple, the vulcanization time is short, and the production efficiency is greatly improved.

This invention discloses a method and system for the comprehensive utilization of catalytic oil slurry. The method first involves hydrogenating the catalytic oil slurry. The separated hydrogenated tail oil then undergoes a cracking reaction. The cracking products are treated with an extractant. After separation, the extract phase is processed by recovering the extractant to obtain aromatic oil. The heavy fraction obtained from the separation of the aromatic oil enters a coking reaction zone, where it reacts to yield oil gas and needle coke products. A comprehensive utilization system for catalytic oil slurry using the above method is also provided. The method and system of this invention can improve the mechanical strength of the obtained needle coke, effectively improve the microstructure of the needle coke, and obtain high-quality needle coke.

The invention relates to the technical field of building energy conservation, heat preservation and heat insulation materials, and discloses a flame-retardant phase-change heat preservation and heat insulation building material and a preparation method thereof.The preparation method of the flame-retardant phase-change heat preservation and heat insulation building material comprises the following steps that paraffin is loaded in ZnO / CuO hollow microspheres to obtain phase-change microspheres; modifying the phase change microspheres with polydopamine and acryloyl chloride to obtain functionalized phase change microspheres; the preparation method comprises the following steps: carrying out graft polymerization on a phosphorus-containing eugenol compound and 1-amino-5-hexene-2-alcohol on the functionalized phase change microspheres to obtain multifunctional phase change microspheres; polyether polyol, functionalized polyol, myricetin, multifunctional phase-change microspheres and the like are used as raw materials, foaming is performed, and the flame-retardant phase-change heat-preservation and heat-insulation building material is obtained. The flame-retardant phase-change heat-preservation and heat-insulation building material is excellent in heat-preservation and heat-insulation performance, flame-retardant performance and mechanical performance, has anti-ultraviolet performance and antibacterial and mildew-proof performance, can reduce erosion damage caused by external conditions, and prolongs the service life.

This invention discloses a 6-series energy-absorbing aluminum alloy and its manufacturing method. The aluminum alloy, by mass percentage, comprises: Mg: 0.50–1.20%, Si: 0.40–1.00%, Mn: 0.15–0.95%, Cr: 0–0.25%, Fe: 0.15–0.45%, Ti: 0.015–0.30%, and Cu: 0.10–0.70%; wherein the Mg / Si mass ratio is ≥0.85 / 1, and the total content of Mn+Cr+Fe is ≤1.2%; it also includes an AlTi5C0.25 grain refiner and impurities with a content not exceeding 0.15%, with the balance being Al. This invention optimizes and precisely designs the content of the main alloying elements in the alloy, and introduces TiC nanoparticles using the AlTi5C0.25 grain refiner, enabling the aluminum alloy profile to possess both high strength and excellent crushability.

The application provides a cation exchange membrane and a preparation method and application thereof, and belongs to the technical field of cation exchange membranes.The method provided by the application is free of volatile organic compounds, toxic and harmful monomers or heavy metal components, and the raw material itself is environmentally friendly.The method is free of harmful gas emission and hazardous waste generation, and is environmentally friendly.The cation exchange membrane material prepared by the method is chemically stable, easy to recycle after being discarded, free of additive precipitation during use, and free of pollution to the treatment system.The water-soluble dispersion bonding medium adopted by the application forms rich and uniform connected pore structures in the cation exchange membrane after being washed by water, greatly reduces ion migration resistance, significantly alleviates membrane polarization, and improves ion exchange rate and energy utilization efficiency when used for separation.The method provided by the application is free of complex chemical reactions, harsh process conditions, and standardized operation steps, and is easy to realize large-scale continuous production.

The present application relates to the technical field of fiber reinforced geopolymer, and particularly discloses a fiber reinforced geopolymer and a drainage pipeline prepared from the same. The fiber reinforced geopolymer comprises mineral powder, fly ash, quartz sand, alkali activator, fiber, latex powder and rubber powder. The mineral powder and the fly ash are sequentially added, stirred at low speed, and mixed uniformly. While stirring, the fiber is slowly added and dry-stirred, then the quartz sand and the rubber powder are added, and water is added to stir uniformly. The latex powder is dissolved in water after being added, forms a coating layer to wrap the surface of the fiber or the geopolymer raw material, changes the interface characteristics of the fiber and the geopolymer matrix, slows down the occurrence of the polymerization reaction, makes the mechanical properties of the EGC material decrease, improves the interface bonding between the fiber and the geopolymer matrix, forms a structure of the synergistic effect of the fiber-latex powder-geopolymer matrix, increases the fracture energy of the fiber reinforced geopolymer, and improves the bending toughness of the fiber reinforced geopolymer.

The invention provides a dental silicone rubber impression composition, a dental silicone rubber impression material kit and a preparation method and application of the dental silicone rubber impression composition and the dental silicone rubber impression material kit, D50 of reinforcing filler in the impression composition is 5-22 microns, and the particle size distribution of the reinforcing filler in the impression composition meets the conditions that D60-D40 is smaller than or equal to 12 m and D40-D20 is smaller than or equal to 12 m at the same time. The particle size distribution of the reinforcing filler in the impression material is controlled to be concentrated enough, so that the initial setting time of the silicone rubber impression material is controllable, and meanwhile, the silicone rubber impression material with relatively high overall strength is also obtained.

This invention discloses a combined production process and system for co-producing needle coke and low-sulfur petroleum coke. The combined production process includes the following steps: a catalytic slurry is mixed with ethylene tar and subjected to a hydrogenation reaction; the hydrogenation reaction products are separated to obtain gas, naphtha, hydrogenated wax oil, and hydrogenated tail oil; the hydrogenated wax oil enters a cracking unit for a cracking reaction; the cracking reaction products are separated to obtain light oil, middle distillate oil, and residual oil; the middle distillate oil is used as feedstock for needle coke production in a needle coke production unit; the residual oil and hydrogenated tail oil are mixed and fed into a low-sulfur petroleum coke production unit to produce low-sulfur petroleum coke. This invention also provides a combined production system for co-producing needle coke and low-sulfur petroleum coke. This effectively solves the problem of excessive hydrogen supply during needle coke production from the hydrogenated slurry, and the problem of short start-up cycles for delayed coking units due to the poor thermal stability of ethylene tar.

The present application relates to the technical field of laser rock breaking, and discloses a surface laser-induced cracking auxiliary rock breaking device, which comprises a laser operation trolley, a laser emitter is arranged on the laser operation trolley, a six-axis robot is arranged on the laser operation trolley, an execution end of the six-axis robot is provided with a surface laser cladding head, an optical fiber input line is arranged in the surface laser cladding head, a plurality of laser grooves are formed in the surface laser cladding head, a laser emission port is arranged in the laser groove, the laser emission port is connected with the optical fiber input line through a line, a collimating mirror and a focusing mirror are sequentially arranged in the laser groove along the axial direction of the surface laser cladding head, and the focusing mirror moves along the axial direction of the laser groove to change the focusing focal length. The rock is rapidly heated by laser to generate cracks, and the rock breaking efficiency of the post-period drilling and blasting method and mechanical method is improved; meanwhile, the focusing intensity of the laser is adjustable, so that the rock is broken by focusing appropriate laser intensity, and the expected rock breaking effect is achieved.

The present application belongs to the field of intelligent materials, and particularly discloses a temperature-controlled flexible piezoresistive sensing material with piezoresistive performance adaptive to temperature environment changes. The temperature-controlled flexible piezoresistive sensing material comprises a base resin and a conductive foam filler; wherein the weight percentage of the conductive foam filler in the base resin is 1% to 50%, the T g of the base resin is -30 to 35℃, preferably 0 to 33℃, and more preferably 15 to 30℃. The temperature-controlled flexible piezoresistive sensing material is based on its specific T g , and realizes adjustable pressure detection range. The RCR can stably respond to a large pressure of 500kPa to 1500kPa at an ambient temperature lower than T g . After the temperature is raised, the RCR can stably respond to a small pressure, and the pressure detection can be accurate to 10kPa, which is 50 times higher than under the foregoing conditions. The present application also discloses a preparation method and application of the temperature-controlled flexible piezoresistive sensing material. The temperature-controlled flexible piezoresistive sensing material can be used as a component of devices including intelligent, wearable, life monitoring or motion monitoring devices.

The utility model relates to the field of silicon wafer platform positioning, in particular to a silicon wafer platform positioning device, which comprises a bottom plate, an adjusting device, a top plate and a silicon wafer platform, the plurality of adjusting devices are fixed between the top plate and the bottom plate in a circumferential array and used for adjusting the height of the top plate, and the top plate is provided with a silicon wafer platform used for placing silicon wafers; the adjusting device comprises a base, an adjusting seat is arranged above the base, a spring pull rod is arranged on the base, one end of the spring pull rod is arranged in the adjusting seat, a spring is arranged on the periphery of the spring pull rod and used for pulling the adjusting seat to the base, and an adjusting screw is arranged on the adjusting seat and used for roughly adjusting the height of the top plate. A piezoelectric ceramic motor is further arranged in the base, the output end of the piezoelectric ceramic motor is connected with the bottom end of the adjusting screw, and the piezoelectric ceramic motor is used for finely adjusting the height of the top plate.

This invention provides a rigid polybutylene succinate (PBS) biodegradable sheet and its preparation method. The biodegradable sheet comprises, by weight: 40-55 parts PBS, 40-50 parts core-shell composite material, 3-5 parts polylactic acid (PLA), 1-2 parts compatibilizer, 0.3-0.5 parts lubricant, and 0.5-1.0 parts nucleating agent. This invention utilizes anhydride to mechanically modify starch under dry conditions, causing esterification and anhydride adhesion to the surface of starch particles. Low molecular weight PBS is then extended and anchored onto the surface of the starch particles via hot-melt extrusion to form a core-shell composite material. This core-shell composite material significantly increases rigidity, prevents starch particles from being exposed, and exhibits excellent compatibility with the PBS matrix. The prepared sheet does not swell or precipitate after boiling. This production technology uses simple raw materials, the hot-melt extrusion equipment is suitable for large-scale production, the biodegradable sheet has a high starch content, and the overall cost is low.

The invention relates to the field of outdoor materials, and particularly discloses a preparation method of a hydrophilic PVDF (polyvinylidene fluoride) membrane, which comprises the following steps: S1, carrying out acidolysis chain scission on native starch to refine into a small molecular starch chain, and then carrying out grafting reaction on the small molecular starch chain and a grafting monomer to obtain a starch grafting monomer; s2, the starch grafting monomer and PVDF are subjected to melt grafting modification, and PVDF grafting modified master batches are obtained; and S3, carrying out granulation modification on PVDF, PMMA, the PVDF grafted modified master batch and a plurality of auxiliary agents, and then carrying out tape casting to obtain the PVDF hydrophilic functional film. According to the invention, the grafting monomer and the starch are firstly modified, so that not only can hydrogen bonds among the starch be broken, but also the starch can be fixed on the grafting monomer, and then the grafting monomer is grafted to the main chain of the PVDF by adopting a melt extrusion grafting method, so that the hydrophilicity and the stability of the PVDF can be greatly improved. The problem of insufficient hydrophilicity of the PVDF membrane in the prior art is solved.

The invention relates to the technical field of cables, and provides a high-flame-retardant power cable which sequentially comprises a cable core, a crosslinked polyethylene insulating layer and a sheath layer from inside to outside. The cable core comprises a conductor and a wrapping tape arranged outside the conductor; the conductor is formed by twisting tin-plated aluminum wires; the sheath layer comprises the following components in parts by weight: 58-64 parts of polyethylene, 36-42 parts of polyvinyl chloride, 12-18 parts of a flame retardant, 4-6 parts of a compatibilizer, 0.5-2 parts of an antioxidant, 5-10 parts of a reinforcing agent and 2-4 parts of a heat stabilizer; the flame retardant is prepared from the following components in parts by weight: 1 to 10 parts of melamine phosphate modified molybdenum trioxide and 1 to 10 parts of guanidyl flame retardant. According to the technical scheme, the problem of insufficient flame retardant property of the power cable in the prior art is solved.

This invention relates to a polycarbonate composition and its preparation method, which mainly comprises the following components, expressed in parts by weight: 65-85 parts aromatic polycarbonate, 15-35 parts phosphorus-silicon copolymer polycarbonate, 0.05-1 part antioxidant, and 0.1-1 part lubricant. The polycarbonate composition prepared by this invention is blended using a twin-screw extruder. The phosphorus-silicon copolymer polycarbonate and aromatic polycarbonate have good compatibility. Through the synergistic flame-retardant effect of phosphorus and silicon, the flame-retardant performance of the polycarbonate composite material is significantly improved, avoiding the use of halogen-free flame retardants and mitigating the reduction in mechanical properties of polycarbonate materials caused by small-molecule flame retardants. Furthermore, the siloxane segments significantly improve the low-temperature impact resistance of the material.

The application discloses a manufacturing method for aluminum alloy door and window profiles, and relates to the technical field of aluminum profile processing.The manufacturing method comprises an extrusion cylinder, an upper die and a lower die which are installed on an extrusion machine body, a liquid nitrogen spraying device for cooling a discharge port of the lower die is arranged on the extrusion cylinder, and the extrusion cylinder, the upper die and the lower die are internally provided with a cooling pipe network which is in communication.The liquid nitrogen filling device is arranged to make liquid nitrogen flow through the inner walls of the extrusion cylinder and the upper die through a first cooling main channel, a first inlet channel, a second cooling main channel, a first cooling branch channel, a central cooling cavity, a second cooling branch channel, a third cooling main channel, a first outlet channel, a third outlet channel and a fifth cooling main channel, so that the extrusion cylinder and the upper die are cooled through heat conduction, the temperature of the inner cavity of the extrusion cylinder and the branch outlet of the upper die is prevented from being too high, the profile is prevented from being subjected to heat and then being subjected to mechanical property decline, surface oxidation change or even intense heat, and the production qualified rate of the aluminum profile is ensured.

The invention relates to a high-impact-resistance polyurethane elastomer containing a cyclodextrin metal organic framework structure and a preparation method of the high-impact-resistance polyurethane elastomer, and belongs to the technical field of elastomeric polymers. The invention provides a high-impact-resistance polyurethane elastomer containing a cyclodextrin metal organic framework structure, the high-impact-resistance polyurethane containing the cyclodextrin metal organic framework structure is novel polyurethane with high impact resistance, CD-MOF can be cross-linked with a macromolecular chain and form a regular and ordered structure with the macromolecular chain, microcrystals are formed, and the high-impact-resistance polyurethane elastomer containing the cyclodextrin metal organic framework structure is prepared. The mechanical property of the polyurethane is improved. When the polyurethane is subjected to external impact, microcrystals are damaged to absorb part of energy, so that the damage degree of molecular chains is weakened, and the impact resistance of the polyurethane is improved. The method is simple in step, an experimental formula can be changed according to production requirements, and industrial production can be carried out.

The application discloses a kind of flame-retardant water-resistant polyether type polyurethane elastomer and preparation method thereof, and relates to the technical field of polyurethane elastomer.The application first prepares boroxin intermediate BOX, then reacts with dimethyl methylphosphonate to obtain reactive phosphorus-containing boroxin flame retardant DMPB, which is introduced into polyurethane elastomer as halogen-free flame retardant.The obtained material has significantly improved limiting oxygen index, reaches UL-94 V-0 level, and has outstanding smoke suppression and toxicity reduction effect;continuous dense carbon layer is formed during combustion, and the mechanical and adhesive properties are excellent, halogen-free, environmentally friendly, water-resistant and stable, suitable for new energy vehicles and electronic components potting and other fields with high requirements for flame retardance and water resistance.

The application relates to a forming method of a duplex stainless steel semi-blind hole forging, which comprises the following steps: step 1) electric ingot finishing, step 2) forging pre-homogenization heat treatment, step 3) two-up and two-down cogging, step 4) upsetting, step 5) punching, step 6) blank making and hole expanding, step 7) blank making and mandrel drawing, step 8) reducing mandrel hole expanding, and step 9) product cooling. The forming method can effectively form a large-size super duplex stainless steel semi-blind hole forging with excellent performance, improves material utilization, reduces machining time, improves production efficiency, and reduces production cost.

This application provides a bio-based chain extender and its application. The bio-based chain extender includes the bio-based compounds 2,5-furandicarboxaldehyde dioxime and / or 5-hydroxymethyl-2-furancarboxaldehyde dioxime. Using these as bio-based chain extenders, modified polyurethanes with antibacterial and antifungal properties can be synthesized. This imparts long-lasting, stable, and broad-spectrum antibacterial and antifungal properties to polyurethane materials, eliminating the need for additional antibacterial agents. This avoids problems such as environmental pollution, short antibacterial time, and unstable antibacterial performance caused by antibacterial agent migration during the use of polyurethane materials. In particular, this bio-based chain extender is bio-based, safe, and environmentally friendly, and has a significant effect on the antibacterial and antifungal modification of polyurethane materials, showing broad application prospects in medical materials, public facilities, and health protection.

The invention discloses a flame-retardant polycarbonate film / sheet and a preparation method thereof, and belongs to the field of high polymer material preparation. The material comprises the following components in parts by weight: 25-89 parts of bisphenol A polycarbonate, 3-15 parts of silicon copolymerized polycarbonate, 5-20 parts of high-temperature polycarbonate, 2-20 parts of a flame retardant, 1-10 parts of a toughening agent and 0-10 parts of other auxiliaries, the high-temperature polycarbonate is obtained by introducing a biphenyl group into bisphenol A polycarbonate. The preparation method comprises the following steps: mixing all the components, carrying out melt extrusion by using a twin-screw extruder at the temperature of 190-320 DEG C to obtain particles, drying the particles at the temperature of 80-125 DEG C, carrying out tape casting extrusion by using a tape casting extruder at the temperature of 190-320 DEG C, cooling on a cold roller at the temperature of 60-150 DEG C, and casting to obtain the flame-retardant polycarbonate film / sheet with the thickness of 25-2000 microns. The product does not contain PFAS substances, accords with the development direction of environmental protection, has the flame retardant property reaching VUL94 V-0 / VTM-0, and can be widely applied to the fields of electronics, electricity, new energy and the like.

This invention relates to the field of polymer material modification technology, specifically disclosing an anti-UV and antistatic polyolefin elastomer composite film and its preparation method. The preparation method of the composite film of this invention includes the following steps: (1) dissolving maleic anhydride-grafted polyolefin elastomer in 80%-90% of the total organic solvent and stirring until it becomes a colorless and transparent liquid; (2) mixing nano zinc oxide, aminated multi-walled carbon nanotubes, carbon black, polyethylene glycol and the remaining organic solvent, dispersing them evenly, and then adding them to the colorless and transparent liquid obtained in (1), stirring to obtain a mixture; (3) inverting the mixture obtained in (2) onto a flat plate and spreading it out, cooling and shaping it, and then drying it to obtain the anti-UV and antistatic polyolefin elastomer composite film. This invention achieves the enhancement of antistatic and anti-UV functions through polar modification of POE-g-MAH, synergistic design of functional fillers and solution dispersion, while retaining the original mechanical properties of POE.

A high-temperature material with high toughness and a preparation method thereof, relate to the field of metal precision casting, and aim to solve the problem of poor room temperature toughness of existing Nb-Si alloy materials.The expression of the material is Nb-16Si-20Zr-2C-xW, and the method comprises the following steps: firstly, weighing raw materials Nb, Si, Zr, C and W; secondly, pre-treating the surface of the raw materials, melting, and obtaining a cast alloy ingot; thirdly, placing the ingot in a non-consumable vacuum arc furnace with an ultrasonic device to perform ultrasonic-assisted melting, and obtaining an ultrasonic-state alloy ingot; fourthly, filling quartz sand, heat treating, and cooling to obtain a heat-treated alloy; and fifthly, polishing the surface of the heat-treated alloy to remove the oxide skin, and the preparation is completed.The present application combines ultrasonic-assisted solidification with heat treatment, and significantly improves the toughness of the alloy material.The present application is used for preparing a high-toughness alloy material.

This invention relates to the field of polymer materials and discloses a modified polypropylene material and its application in HPPM double-wall corrugated pipes. The modified polypropylene material comprises: polypropylene resin, modified graphitic carbon nitride, modified multi-walled carbon nanotubes, and additives. The modified graphitic carbon nitride is prepared by grafting a hindered amine-type bromine-substituted intermediate with amino-modified graphitic carbon nitride. The hindered amine-type bromine-substituted intermediate is prepared by reacting ethyl 2-amino-4-methylthiazolium-5-carboxylate with 1,4-dibromobutane and then undergoing transesterification with 2,2,6,6-tetramethyl-4-piperidinol. The modified multi-walled carbon nanotubes are prepared by grafting acyl chloride multi-walled carbon nanotubes with a cyclotriphosphazene derivative. The cyclotriphosphazene derivative is prepared by reacting 4-imidazolium formaldehyde with p-phenylenediamine, then undergoing substitution with hexachlorocyclotriphosphazene and further addition with DOPO. The modified polypropylene material prepared by this invention possesses good mechanical properties, UV aging resistance, flame retardancy, and antibacterial properties.