653results about How to "Improve bending strength" patented technology

The invention relates to a zirconia-based all-ceramic false tooth and a preparation method thereof. A core layer of the zirconia-based all-ceramic false tooth is prepared from the following components in parts by mass: 90 to 94 parts of ZrO2, 5 to 9 parts of Y2O3, 0.1 to 0.5 part of Al2O3, 0.01 to 0.5 part of Fe2O3, 0.01 to 0.5 part of Er2O3 and 0 to 0.2 part of MnO2, and a shell layer of the zirconia-based all-ceramic false tooth is prepared from the following components in parts by mass: 24.5 to 49.5 parts of CaCO3, 45 to 50 parts of SiO2, 0 to 25 parts of MgO, 0.01 to 0.5 part of Fe2O3, 0.01 to 0.5 part of Er2O3 and 0 to 0.2 part of MnO2. The preparation process comprises the following steps: performing dry pressing and isostatic pressing on raw materials of the core layer, presintering, and carving to obtain a zirconia-based false tooth biscuit; meanwhile, calcining raw materials of a shell layer, then adding deionized water, a dispersing agent and an adhesive, and carrying out ball milling and mixing to obtain calcium-magnesium-silicon-based ceramic slurry; and coating the calcium-magnesium-silicon-based ceramic slurry on the surface of the zirconium oxide-based false tooth biscuit, and sintering to obtain the zirconium oxide-based all-ceramic false tooth provided by the invention. The zirconia-based all-ceramic false tooth has good jade texture and is closer to the natural color of natural teeth.

The invention discloses pressureless sintered aluminum nitride ceramic as well as a preparation method and application thereof. The preparation method comprises the following steps: ball-milling and mixing micron-sized aluminum nitride, a sintering aid, nano-sized molybdenum powder, a dispersing agent, a binder and an organic solvent to prepare slurry; and drying the slurry, granulating, forming, dumping and sintering to obtain the pressureless sintered aluminum nitride ceramic. Wherein the sintering aid is a combination of samarium fluoride and yttrium fluoride. According to the preparation method, oxygen is removed at a low temperature by virtue of strong affinity of the nanoscale molybdenum powder and oxygen, the nanoscale molybdenum powder and the sintering aid jointly play a role in liquid-phase sintering assistance at a high temperature, densified sintering is realized and grain growth is inhibited by adopting pressureless sintering at a relatively low sintering temperature, the aluminum nitride ceramic with both heat conduction and strength is obtained, and meanwhile, a low-resistance second phase is generated; the resistivity of the aluminum nitride ceramic is adjusted while the heat conduction characteristic of the aluminum nitride ceramic is improved, the electrical conductivity of the aluminum nitride material is improved, and finally the aluminum nitride ceramic with high heat conduction and bending strength and moderate resistivity is obtained to meet the use requirements of electrostatic chucks.

The invention is suitable for the technical field of materials, and provides a binderless fiberboard and a preparation method thereof.The preparation method comprises the steps that wood fibers are subjected to oxidation treatment, and an intermediate is obtained; placing the intermediate in a metal ion solution for non-covalent bond coordination treatment, extruding the solution, and adding polyphenol into the fiber for chelation to obtain a chelated fiber; and assembling the chelate fibers into a plate blank, and carrying out hot pressing treatment to obtain the product. Metal ions and lignin hydroxyl are bonded and coordinated through an activation method, then the metal ions and polyphenol are chelated to form self-adhesion, meanwhile, the non-adhesive fiberboard formed by tightly interweaving and stacking the fibers can reach the national standard in mechanical strength and water absorption expansion rate, the preparation method is simple and easy to implement, raw materials are easy to obtain, and the production cost is low. The method is suitable for mass production; by means of the formed double-network structure, the binderless fiberboard is more compact, higher in stability and excellent in internal bonding strength, bending strength and other mechanical properties. Zero formaldehyde release of the fiberboard is achieved, and the cost is lower.

The invention discloses a low-smoke flame-retardant cable outer layer material, and a preparation method of key components and a high-entropy alloy nano material comprises the following steps: grinding cerous nitrate, ferric nitrate, manganous nitrate, sodium hexahydroxyplatinate and copper nitrate into particles according to a ratio of 2: 1: 1: 1: 1; then adding 10-20 times by mass of a 32% tannic acid solution and 5-8 times by mass of a 10% glutaraldehyde solution, carrying out an oil bath at 65-70 DEG C for a reaction for 4-8 h, then carrying out overnight vacuum freeze drying to obtain mixed powder, placing the mixed powder in a crucible of a muffle furnace, then calcining the mixed powder at 1000-1200 DEG C under the protection of nitrogen flow for 4-10 h, and finally cooling the calcined mixed powder to room temperature. And cooling. The prepared outer layer material for the cable overcomes the defects that a conventional cable easily releases a large amount of toxic smoke during combustion, is poor in flame retardant property and contains halogen to pollute the environment.

The invention discloses an ablation-resistant long-fiber reinforced nylon material for a battery pack, and relates to the technical field of nylon materials, the ablation-resistant long-fiber reinforced nylon material comprises the following raw material components by weight: 60-80 parts of nylon resin powder, 30-50 parts of a long-fiber reinforced material, 10-18 parts of aluminum diethylhypophosphite master batch, 8-15 parts of bromine-antimony composite master batch, 3-7 parts of montmorillonite, 12-20 parts of aluminum hydroxide, and 2-6 parts of nano-silica. The composite material is prepared from the following components in parts by weight: 1-4 parts of carbon nanotubes, 0.5-1.2 parts of an antioxidant I, 0.3-0.8 part of a lubricant I, 2-5 parts of a compatilizer, 0.1-0.4 part of a nucleating agent and 0.2-0.6 part of an anti-ultraviolet agent. By adding the diethyl aluminum hypophosphite master batch, the flame retardant property of the nylon material is improved, the processability of the nylon material is improved, the ablation resistance of the nylon material is improved, and the problems of insufficient flame retardant property, poor processability and poor ablation resistance of the nylon material can be solved.

The invention discloses a preparation method of ultra-fine grain high-entropy carbide-based metal ceramic, which comprises the following steps: step 1, dispersing multi-component carbide powder or micron-sized high-entropy carbide powder in an organic solvent, adding phenolic resin and ceramic grinding balls, and carrying out ball milling; step 2, pre-sintering the dried high-entropy ceramic powder; 3, the obtained high-entropy carbide ceramic powder and metal powder are subjected to conventional ball milling, 1-3 wt% of paraffin or a rubber forming agent is added, a ball milling medium is absolute ethyl alcohol, and then the mixture is subjected to spray granulation; step 4, pressing and forming the granulated powder; and fifthly, the pressed blank is degreased and sintered, and the ultra-fine grain high-entropy carbide-based metal ceramic is obtained. The ultra-fine grain high-entropy carbide-based metal ceramic material with the bending strength superior to 2300 MPa, the fracture toughness superior to 9.5 MPa.m < 0.5 > and the Rockwell hardness superior to 92.0 HRA can be obtained, and the ultra-fine grain high-entropy carbide-based metal ceramic material can be widely applied to the fields of bearing materials, cutting tools, mold materials and the like.

The invention discloses a multi-density honeycomb core energy absorption structure and application thereof.The energy absorption structure is integrally formed by adjacently arranging a plurality of honeycomb cores, the aperture of each honeycomb core is gradually decreased from the center of the energy absorption structure to the periphery, and the arrangement density of the honeycomb cores is gradually increased from the center of the energy absorption structure to the periphery. The multi-density honeycomb core energy absorption structure is small in middle density and large in periphery density, has the advantages of being good in energy absorption curve stability, small in trigger impact force, stable in curve, high in bending strength and the like, and compared with existing products at present, the multi-density honeycomb core energy absorption structure can effectively improve the compressive strength of unit area. And meanwhile, the cross section density of the energy absorption structure can be changed and adjusted, the size can be customized, and the application range is wider.

The invention discloses a flexible silicon wafer and a preparation method thereof, and a flexible solar cell prepared by using the flexible silicon wafer. The preparation method of the flexible silicon wafer comprises the following steps: polishing the front surface and the back surface of the silicon wafer by adopting a polishing solution; depositing a thick dielectric film on the back area of the silicon wafer by adopting an ALD (Atomic Layer Deposition) method or a PECVD (Plasma Enhanced Chemical Vapor Deposition) method, plating the thick dielectric film on the side area and the front edge area of the silicon wafer in a winding manner, and forming a thin dielectric film on a transition area between the thick dielectric film on the front edge area of the silicon wafer and a middle non-mask area; and texturing the middle area of the silicon wafer and the transition area covered by the thin dielectric film by adopting an alkaline solution, then removing the thick dielectric film in other areas by adopting an HF-containing acidic solution, and cleaning the silicon wafer. According to the method, the bending strength of the silicon wafer can be improved, the flexibility of the HJT battery is improved, and the application range of the thin HJT battery is expanded.

Belonging to the technical field of thermal insulation material preparation, the invention relates to a corrosion resistant thermal insulation material for marine thermal insulation, which is prepared by the following steps: carrying out acidolysis treatment on plants, then filtering, and pulping the filtered product to obtain a fiber acidolysis solution and a fiber acidolysis product. And then modifying the fiber acidolysis solution and the fiber acidolysis product by using dopamine hydrochloride and a silane coupling agent respectively. The modified cellulose has a good fusion effect in a polyurethane system due to the fact that the modified cellulose contains an amide group, and can be stably adhered to the surface of a metal pipeline for energy transportation in the ocean. Si-O-Si bonds formed by the modified plant fibers can improve the structural stability of the fibers, so that the weather resistance, tensile strength, impact strength and other mechanical properties are improved. The prepared thermal insulation material has the characteristics of good mechanical property and high stability.

The invention relates to a modified epoxy resin adhesive and a preparation method thereof, and belongs to the technical field of high polymer materials. The modified epoxy resin adhesive comprises the following components in parts by weight: 90-120 parts of epoxy resin, 8-25 parts of a curing agent, 1-3 parts of a diluent, 0.5-5 parts of a curing accelerator, 4-18 parts of graphite, 1-4 parts of a modified flexibilizer and 10-30 parts of nano diamond / boron nitride (PDA), a polyurethane single soft and hard segment structure and a high-temperature-resistant oxazolidinone ring in the modified toughening agent cooperate with poly (p-phenylene ether sulfone) resin, so that the toughness is effectively enhanced, and crack propagation is inhibited; boron nitride is modified by nano-diamond, wear resistance is optimized, good electric insulativity and chemical corrosion resistance are given to a matrix, polydopamine can promote a compound to be evenly dispersed in the epoxy resin matrix, wear resistance and adhesive force are improved, and the prepared modified epoxy resin adhesive has good toughening and wear-resisting effects and also has the advantages of being good in toughness, good in toughness and good in wear resistance. And the cable also has excellent high temperature resistance, corrosion resistance and electric insulation effects.

The invention relates to the technical field of composite materials, in particular to a PTFE composite material for a shaft sleeve and a preparation method of the PTFE composite material. The PTFE composite material for the shaft sleeve consists of the following raw materials in parts by weight: 80-140 parts of polytetrafluoroethylene powder, 3-8 parts of polyphenylene sulfide, 8-12 parts of modified glass fibers and 10-15 parts of a reinforcing agent. The lubricating property of a base material is effectively improved by adding the modified glass fiber, and meanwhile, the wear resistance and the mechanical property of the polytetrafluoroethylene composite material are favorably improved by improving the tribological property, enhancing the mechanical strength and improving the interface bonding and load dispersion through the reinforcing agent.

The invention provides a lightweight insulation composite cross arm. The lightweight insulation composite cross arm comprises an insulation core rod, a filler filled in the insulation core rod and an insulation umbrella skirt located outside the insulation core rod, the structure of the insulating core rod is a pipe body formed by modified continuous basalt fibers which are spirally arranged in multiple layers, and resin is adhered to the surfaces of the modified continuous basalt fibers; the structure of the modified continuous basalt fiber is as follows: basalt fiber chips are connected to the surface of the continuous basalt fiber through silica sol; the resin comprises the following raw materials: 100 parts of epoxy resin, 1-5 parts of a silane coupling agent, 5-8 parts of an auxiliary agent, 8-10 parts of basalt fiber chippings, 20-30 parts of a curing agent and 30-50 parts of a solvent. According to the invention, the continuous basalt fibers are modified by the basalt chips, and the basalt chips are used as a bridge, so that the interaction between the continuous basalt fibers and a resin matrix is increased, and the bending modulus and bending strength of the insulating core rod are improved.

The invention relates to the technical field of polycarbonate, and discloses a preparation method of a halogen-free flame-retardant PC plastic material. According to the invention, polycarbonate and a triazine sulfonate-based silicone oil flame retardant are blended in a torque rheometer to obtain the halogen-free flame-retardant PC plastic material. A sulfonate group in the flame retardant can catalyze polycarbonate to be crosslinked into carbon, polysiloxane is pyrolyzed, an S-C layer is formed on the surface of polycarbonate, and a triazine group is pyrolyzed to generate nitrogen and other non-combustible gases, so that the limit oxygen index, the UL94 grade and the flame retardant property of the polycarbonate plastic material are improved. The triazine sulfonate-based silicone oil flame retardant contains hydroxyl, imino and other groups and has good compatibility with polycarbonate, the main chain is a flexible polysiloxane main chain, a good toughening effect can be achieved, and the bending strength and impact strength of a polycarbonate material are improved.

The utility model discloses a battery device and a power utilization device. The battery device comprises a battery monomer, a box body and a filling medium, the battery monomers are located in the box body, the box body comprises a beam body, and a cavity is formed in the beam body; and the filling medium comprises a plurality of granular filling units, and the filling medium is filled in the cavity. The box body is constructed by the beam body with the cavity, so that the weight of the box body can be well reduced, and the lightweight design of the box body is facilitated. By filling the beam body of the box body with the plurality of granular filling units, dynamic load can be well absorbed and consumed, the beam body can be well supported, the structural strength of the beam body is effectively improved, and when the beam body is broken due to impact, the granular filling units in the beam body can also be released from the gap of the broken part, so that the service life of the beam body is prolonged, and the service life of the beam body is prolonged. Impact force can be better consumed, and damage caused by impact or impact is further reduced.

The invention belongs to the technical field of ceramic green body reuse, and discloses a preparation method of reuse slurry prepared from magnesium oxide ceramic green body waste, which comprises the following steps: crushing the magnesium oxide ceramic green body waste scraped by a scraper in a tape casting process, then mixing with magnesium oxide powder according to a mass ratio of 2.8-3.2: 7, supplementing a solvent, a binder and a dispersant into the mixture, and uniformly mixing to obtain the reuse slurry. The concentration of the binder in the reusing slurry is 3.5-9%, the concentration of the dispersant in the reusing slurry is 0.5-1%, and the solid content of the reusing slurry is 51-61%. According to the preparation method of the reusing slurry, the recovered magnesium oxide ceramic green body waste can be continuously processed and used and has good bending strength.

The invention relates to the technical field of plastic packaging bottles, and discloses a degradable environment-friendly material cosmetic packaging bottle and a preparation method thereof.The degradable environment-friendly material is prepared from, by weight, 60-75 parts of polyethylene resin, 25-40 parts of hydroxyl quaternary ammonium salt grafted polylactic acid, 1.6-3 parts of maleic anhydride grafted polyethylene and 0.3-0.6 part of antioxidant; the maleic anhydride grafted polyethylene disclosed by the invention can be used as a compatilizer to improve the compatibility between the hydroxyl quaternary ammonium salt grafted polylactic acid and polyethylene resin, the obtained degradable environment-friendly material has higher mechanical properties, and the hydroxyl quaternary ammonium salt grafted polylactic acid contains biquaternary ammonium salt antibacterial groups, so that the antibacterial property of the degradable environment-friendly material is improved. Therefore, the degradable environment-friendly material shows good antibacterial performance. The degradable environment-friendly material disclosed by the invention contains a degradable polylactic acid component, is green, environment-friendly, degradable and good in antibacterial property, and has good application in the aspects of cosmetic packaging bottles and the like.

The invention belongs to the technical field of inorganic powder, and discloses polymer-coated modified heavy calcium carbonate composite particles as well as a preparation method and application thereof. The preparation method comprises the following steps: mixing and stirring heavy calcium carbonate and a mixed solution of NaOH and Na2CO3, and carrying out suction filtration, washing and drying; adding KH-570 hydrolysate into the obtained surface hydroxylated ground calcium carbonate, continuously stirring in an oil bath pan, carrying out reflux condensation reaction for 3 hours, carrying out suction filtration, and drying to obtain KH570-OH-GCC; sequentially adding lauryl sodium sulfate, deionized water and KH570-OH-GCC, and adding an initiator for reaction; dropwise adding a mixed solution of butyl acrylate and ethylene glycol dimethacrylate, and reacting for 2 hours after dropwise adding; and adding an emulsifier, continuously stirring, dropwise adding a mixed solution of methyl methacrylate and allyl methacrylate, reacting for 2.5 hours after dropwise adding, cooling, carrying out suction filtration, and drying to obtain the polymer-coated modified heavy calcium carbonate composite particles.

The present invention discloses a nickel-doped enhanced aluminum nitride ceramic and a preparation method thereof, and relates to the technical field of ceramic additive manufacturing. In the preparation method of the nickel-doped enhanced aluminum nitride ceramic provided by the present invention, the nickel powder is first demagnetized at high temperature before nickel is added, thereby avoiding the influence of the ferromagnetism of nickel metal on the performance of the ceramic substrate; further introducing an oxide-type sintering aid can reduce the sintering temperature of the nickel-doped aluminum nitride, thereby avoiding the high temperature required during sintering causing certain hidden dangers to the equipment and workers, and helping to prepare aluminum nitride ceramics with high density, fine grains, and uniform microstructure; (3) In the preparation method of the present invention, by post-processing the sintered aluminum nitride ceramics with hot isostatic pressing, its bending strength can be further improved, thereby preparing the nickel-doped enhanced aluminum nitride ceramics.

The invention relates to the technical field of coatings, and discloses a preparation method and application of an organosilicon waterproof coating. The organic silicon waterproof coating is obtained by uniformly stirring and mixing the solvent, the epoxy resin, the pigment filler, the dispersing agent, the defoaming agent, the polyether modified organic silicon polystyrene and the curing agent. According to the invention, polyether modified organosilicon polystyrene is added into the epoxy resin coating, crosslinked polystyrene has very high mechanical strength, a molecular main chain contains flexible siloxane, a side chain contains a polyether chain segment of a three-dimensional branched molecular chain, and the polyether chain segment and an epoxy resin molecular chain form a physical space crosslinking effect; according to the present invention, the main chain organosilicone polystyrene has characteristics of good toughening effect, significantly improved tensile strength, significantly improved elongation at break, significantly improved bending strength and significantly improved impact property, and the main chain organosilicone polystyrene has strong hydrophobicity, such that the hydrophobicity can be improved when the main chain organosilicone polystyrene is added into the epoxy resin coating material, and the water absorption rate can be easily reduced, and the water resistance can be easily improved.

The invention relates to the technical field of melamine resin, and discloses a cellulose melamine resin composite material preparation method, which comprises: adding melamine resin and modified cellulose into an internal mixer, mixing, discharging, carrying out ball milling crushing, placing the material in a press vulcanizer, and carrying out hot pressing to obtain the cellulose melamine resin composite material. The triazine structure-containing diphenyl sulfone polymer introduced into cellulose microcrystals has good compatibility with melamine resin containing a triazine structural unit, so that the dispersity of the cellulose microcrystals in the melamine resin is improved, and the cellulose microcrystals have a good reinforcing effect; the bending strength and the impact strength of the melamine resin material are obviously improved. And a heat-resistant diphenyl sulfone structure is introduced, so that the thermal decomposition temperature and the mass residual rate of the resin material are obviously increased, and the heat resistance is improved.

The invention relates to the technical field of composite plastic processing, in particular to fluoride-free flame-retardant PC / ABS composite plastic and a preparation method thereof.The fluoride-free flame-retardant PC / ABS composite plastic is prepared from, by weight, 15-20 parts of PC, 20-30 parts of ABS, 1-2 parts of compatilizer, 1-1.5 parts of stabilizer, 8-14 parts of flame retardant and 0-1 part of other auxiliaries. Each part of the flame retardant is prepared by mixing polyurethane containing organic phosphate and an inorganic flame-retardant filler according to a weight part ratio of (8-10): 5; the inorganic flame-retardant filler is aluminum hydroxide or / and magnesium hydroxide. The fluoride-free flame-retardant PC / ABS composite plastic prepared according to the formula avoids the release of toxic gas at high temperature, and meets the environment-friendly requirement. According to the flame-retardant PC / ABS alloy plastic, the flame-retardant property of the PC / ABS alloy plastic is remarkably improved through the synergistic effect of the polyurethane containing the organic phosphate and the inorganic flame-retardant filler, the UL94 V-0 grade is reached, the use amount is small, and meanwhile it can be guaranteed that the PC / ABS alloy plastic has good impact resistance, tensile strength and bending strength.

The invention relates to the technical field of high polymer materials, and particularly discloses a nano-silica synergistic flame-retardant polypropylene composite material and a preparation method thereof, and the nano-silica synergistic flame-retardant polypropylene composite material comprises the following components in parts by mass: 50-70 parts of PP resin, 10-20 parts of a flame retardant, 2-8 parts of a flame-retardant synergist, 1-5 parts of a flow modifier, 0.2-0.8 part of an anti-dripping agent and 0.5-2 parts of an antioxidant. Compared with the prior art, the flame-retardant polypropylene composite material has the beneficial effects that the prepared flame-retardant polypropylene composite material has excellent performance in tensile strength, elongation at break, bending strength, impact strength, melt index and limit oxygen index.

The invention relates to a B1-grade high-flame-retardant NS type fireproof cable preparation technology, and belongs to the technical field of cables. According to the preparation technology of the B1-level high-flame-retardant NS type fireproof cable, after the insulated wire cores wrap copper and are stranded into the cable, gaps of the cable core are filled with PP filling ropes to be round, the cable core is wrapped with two layers of halogen-free flame-retardant belts, the cable core is longitudinally wrapped with an aluminum belt through argon arc welding, and the aluminum sheath is formed through embossing treatment; and finally, the ceramic silicone rubber tape and the low-smoke halogen-free flame-retardant polyolefin sheath material for the low-heat-release cable are lapped, so that the finished cable is obtained, the sealing performance, the fire resistance, the impact resistance and other performance of the cable are improved through treatment of multi-layer lapping, ceramic silicone rubber tape preparation and the like, the same fire resistance performance is met, and meanwhile the service life of the cable is prolonged. The B1-level high-flame-retardant NS type fireproof cable has the characteristics of impact resistance and spraying resistance, has better safety performance, and can relieve pressure for fire rescue and strive for greater opportunities for personnel escape when a fire occurs.

The invention relates to the technical field of dental repair materials, in particular to a nano zirconia ceramic material for dental repair and a preparation method thereof. The preparation method comprises the following steps: S1, preparing nano zirconium oxide powder; s2, preparing composite spherical powder; s3, preparing a green body; and S4, high-temperature sintering: unpacking the hot-pressed green body, and performing high-temperature sintering to obtain the nano zirconia ceramic material for dental restoration. According to the present invention, the mechanical property, the biocompatibility, the antibacterial property, the aesthetic property and the like of the prepared nano-zirconia ceramic material for dental restoration are comprehensively improved through a variety of modification means and optimization processes, and the prepared nano-zirconia ceramic material becomes the ideal dental restoration material.

The invention provides a preparation method of a boron nitride setter plate, and belongs to the technical field of boron nitride setter plates. The preparation method comprises the steps of material mixing, cold isostatic pressing forming and vacuum sintering. The material mixing step comprises the following steps: putting hexagonal boron nitride powder with the particle size of 100-200nm, hexagonal boron nitride powder with the particle size of 1.0-3.0 mu m, hexagonal boron nitride powder with the particle size of 4.0-10.0 mu m, ammonium bicarbonate, phenolic resin and sodium tripolyphosphate into a ball-milling device, adding absolute ethyl alcohol for ball-milling treatment, then adding a secondary compound for continuous ball-milling for 23-28min, and after ball-milling is finished, cooling to room temperature to obtain the boron nitride composite material with the particle size of 100-200nm, the particle size of 1.0-3.0 mu m, the particle size of 4.0-10.0 mu m and the particle size of 1.0-3.0 mu m and the particle size of 4.0-10.0 mu m. Drying at 87-92 DEG C to obtain dry powder; the boron nitride setter plate prepared by adopting the method disclosed by the invention is high in mechanical strength and strong in toughness, and can still keep relatively high mechanical strength after repeated cold and heat cycles.

The invention discloses high-heat-resistance modified PP (polypropylene) resin and a preparation method thereof. The high-heat-resistance modified PP resin comprises polypropylene, silicon dioxide, nano calcium carbonate, a heat-resistance modifier, an antioxidant, a stiffening agent, a coupling agent, a surfactant and a dispersing agent, the preparation method comprises the following steps: respectively dispersing silicon dioxide and nano calcium carbonate in ethanol, and then respectively carrying out reflux reaction with a coupling agent; respectively adding a surfactant into the silicon dioxide and the nano calcium carbonate, and stirring; respectively adding a dispersing agent into the surface-modified silicon dioxide and nano calcium carbonate; adding the heat-resistant modifier into the polypropylene resin to obtain a first auxiliary agent, adding the antioxidant into the polypropylene resin to obtain a second auxiliary agent, and adding the stiffening agent into the polypropylene resin to obtain a third auxiliary agent; and adding the dispersed silicon dioxide, nano calcium carbonate, a first auxiliary agent, a second auxiliary agent and a third auxiliary agent into polypropylene resin, and mixing to obtain the high-heat-resistance modified PP resin.

The invention discloses a ceramic matrix composite integrally-formed blade and a preparation method thereof, and relates to the technical field of aero-engine preparation. The method comprises the following steps that fiber cloth is laid on the outer surface of a blade body mold, meanwhile, the fiber cloth is reserved at the two ends, and then the fiber cloth penetrates through the reserved fiber cloth and is laid; spreading the reserved fiber cloth on the outermost layer in a divergent manner, and circularly stacking; the fiber cloth forms an L-shaped laying layer along the mold, and the remaining reserved fiber cloth is flatly laid along the L-shaped laying layer; then, fiber cloth penetrates through the reserved fiber cloth and then is laid, and a U-shaped laying layer is formed; the stacking is cyclically carried out; suturing and fixing to obtain a blade preform; and carrying out subsequent treatment to obtain the ceramic matrix composite integrally formed blade. The integrally-formed laying layer structure is adopted, the complete fibers penetrate through the blade body, the blade crown and the edge plate and are sewn into a whole, so that the blade component can be integrally formed, the connection reliability problem between split parts is solved, and the overall reliability of the blade is improved.

The invention relates to the technical field of polyphenylene sulfide, and discloses a preparation method of a high-temperature-resistant high-thermal-conductivity PPS composite material, 65-80 parts by weight of polyphenylene sulfide and 20-35 parts by weight of thioether polyarylene ether nitrile grafted graphene are added into a twin-screw extruder, melt blending and granulation are performed, and the high-temperature-resistant high-thermal-conductivity PPS composite material is obtained. After the surface of the graphene is grafted and coated with a thioether polyarylene ether nitrile molecular chain, the graphene is better in dispersity and higher in compatibility with polyphenylene sulfide, the graphene is uniformly dispersed in the polyarylene ether nitrile-polyphenylene sulfide alloy composite material, a better reinforcing effect is achieved, the tensile strength, the bending strength, the thermal weight loss temperature and the heat conductivity coefficient of the composite material are improved, and the service life of the composite material is prolonged. Higher mechanical property, high temperature resistance and heat-conducting property are shown. And moreover, the anti-creeping paint shows a relatively high anti-creeping tracking index CTI value and has good anti-creeping performance.

The invention relates to a carbon-ceramic composite material and a preparation method thereof, a carbon-ceramic brake disc and a vehicle. The preparation method of the carbon-ceramic composite material comprises the following steps: providing raw materials: short carbon fibers, ground carbon fibers, carbon powder and organic resin; the length of the chopped carbon fibers is 8-15 mm, the length of the ground carbon fibers is 200-500 [mu] m, the length-diameter ratio of the ground carbon fibers is (30-70): 1, the mass of the ground carbon fibers accounts for 3%-8% of the total mass of the raw materials, and the mass of the chopped carbon fibers accounts for 40%-60% of the total mass of the raw materials; the raw materials are mixed and subjected to forming treatment, and the carbon fiber composite material is prepared; and the carbon fiber composite material is sequentially subjected to carbonization treatment and siliconizing treatment, and the carbon-ceramic composite material is prepared. The carbon-ceramic composite material prepared by the preparation method has relatively good bending strength, tensile strength and impact toughness.

The invention discloses a concentric structure composite screw based on a step-by-step antibacterial-vascularization-osteogenesis drug release system and a preparation method of the concentric structure composite screw. The preparation method comprises the following specific steps: (1) preparing a methacrylated sodium alginate solution loaded with an antibacterial drug, a vascular promoting drug and an osteogenesis promoting drug respectively; 2) designing and preparing a transparent step-by-step detachable pouring mold with a concentric circle structure; 3) on the basis of the mold, a multi-step in-situ pouring-UV preliminary curing-freezing demolding process is combined, and composite pregel sequentially comprising an osteogenesis layer, a blood vessel formation layer and an antibacterial layer from inside to outside is prepared; and (4) the pregel is subjected to complete UV curing and placed in rotary drying equipment to be dried, a screw master batch is obtained, and the concentric-structure composite screw material is obtained after turning. Due to the concentric circle structure and the multi-layer space medicine carrying structure of the screw, the screw is endowed with excellent mechanical strength and step-by-step antibacterial-vascularization-osteogenesis medicine release capacity, and the screw has important clinical significance on bone defect treatment.