1133 results about "High surface" patented technology

The invention belongs to the technical field of aerogel materials, and particularly relates to high-performance antistatic aerogel for 3D printing as well as a preparation method and application thereof. According to the invention, inorganic hollow nanoparticles are selected as a nucleating modifier for in-situ polymerization of aniline monomers in a polyamide solution, so that polyaniline-coated inorganic hollow nanoparticles are uniformly dispersed in polyamide, and the aerogel composite material with polyamide as a continuous phase and polyaniline-coated inorganic hollow nanoparticles as a conductive and reinforced phase is formed. The use of the hollow inorganic nanoparticles avoids the problem that the solid inorganic nanoparticles lose the characteristics of the inorganic nanoparticles due to high specific gravity and high surface energy, and easy agglomeration or adsorption with other substances in the preparation process of the solid inorganic nanoparticles. The inorganic hollow nanoparticles are adopted as a nucleating modifier, so that the problems of agglomeration of solid nanoparticles and dispersion in a polyamide matrix are well solved.

The invention relates to an antistatic PET (Polyethylene Terephthalate) base film for preparing a polaroid release film and a preparation method thereof, the release film base film is prepared by taking an optical-grade PET slice as a main body, adding modified PET with a specific structure and a modified SiO2 filler, and carrying out co-extrusion casting, a unique three-section stretching process and coating with a coating liquid. According to the invention, material modification and process improvement are carried out, specifically, an optical-grade PET slice is taken as a main body material, modified PET and a modified SiO2 filler with a specific structure are added, a film is prepared through co-extrusion casting and a unique three-section stretching process, and then the surface of the film is coated with a layer of antistatic coating liquid, so that the antistatic film is obtained. The finally prepared base film has low alignment angle, low transverse hot shrinkage rate and high surface adhesion, keeps the characteristics of high light transmittance and low haze of an optical-grade polyester film, endows the film with certain antistatic property, and is particularly suitable for being used as a release film of a high-end polaroid.

The invention discloses a method for improving the high-cycle fatigue performance of a Ti6Al4V titanium alloy, and belongs to the technical field of metal material processing, and the method comprises the following steps: S1, determining shot peening strengthening parameters based on material performance parameters and related standards; according to the method, high-amplitude residual compressive stress is introduced through shot peening strengthening, the stress state of the surface and the depth direction of the material is changed, accordingly, crack extension can be restrained, the fatigue life is prolonged, in addition, a plastic deformation layer is induced to be generated under the surface depth in the shot peening process, the microstructure of the material is improved, and the anti-fatigue performance of the material is improved; through femtosecond laser shock, surface defects can be effectively removed, the surface compactness can be improved, microcracks can be reduced, and a refined grain structure can be generated, so that the strength and toughness of the material are further enhanced, the high-cycle fatigue performance of the material is further improved, the two are combined, the residual stress state is optimized, and the surface integrity is improved. The fatigue performance of the Ti6Al4V titanium alloy is remarkably improved.

The invention discloses a carbon nanotube-aerogel-aluminum silicate super-hydrophobic anti-icing material and a preparation method thereof. The composite material comprises a photo-thermal carbon nanotube-aerogel super-hydrophobic composite solution and an aluminum silicate fiber substrate. The photo-thermal carbon nano tube-aerogel super-hydrophobic composite solution is a composite solution formed by mixing carbon nano tubes, aerogel particles, resin, a low-surface-energy modifier and a diluent, the material can improve the moisture-proof and heat-insulating capacity of aluminum silicate fibers used in an outdoor high-humidity environment, photo-thermal conversion loss is reduced due to the super-hydrophobicity of the surfaces of the aluminum silicate fibers, and the photo-thermal conversion efficiency is improved. Therefore, the photo-thermal deicing efficiency of the surface is improved.

The invention discloses a quality detection system based on three-dimensional point cloud scanning and RGB image fusion, relates to the technical field of industrial automatic detection, and aims to solve the problem of high quality detection error rate caused by the fact that a detection result is easily interfered by visual angle change and illumination conditions in an existing detection method. According to the method, the color point cloud model under the unified coordinate system is constructed through space calibration and point pixel level registration, and the structural information and texture features of the workpiece are effectively reserved. Therefore, the problem that the quality detection error rate is high due to the fact that the detected object has curvature dramatic change, a strong reflection area or frequent shielding is solved. According to the method, the detection accuracy is improved, meanwhile, the robustness and the operation efficiency are high, the industrial workpiece detection requirements with complex curved surface structures and high surface quality requirements can be met, and the actual application requirements of an industrial site for an intelligent surface detection system are met.

The present invention relates to the technical field of ship lock concrete construction, and in particular to a material placing system and construction method for concrete pouring on a high surface of a ship lock. According to the present invention, a feeding belt conveyor is arranged in a line direction of the ship lock and used for conveying concrete materials from a bottom end to a high end, and then by means of a bidirectional telescopic material placing machine which is transversely arranged, the concrete materials are transversely conveyed to the side wall of the ship lock for concrete pouring; the pouring height is adjustable; the transverse extension and retraction length is adjustable, and the bidirectional telescopic material placing machine can extend and retract along the left side and the right side in the transverse direction; and the pouring range is large, and the construction efficiency is high.

The invention relates to an ultra-precision grinding and photochemical mechanical polishing combined process for a laser crystal sheet. Comprising the following steps that coarse grinding is conducted through a coarse-grained grinding wheel, rapid thinning is achieved, the depth of a subsurface damaged layer is determined, and reference is provided for the grinding wheel feeding amount in the accurate grinding stage; a fine-grained grinding wheel is adopted for accurate grinding, a damaged layer introduced in the coarse grinding stage is removed, and high surface / subsurface quality and surface precision are obtained by optimizing technological parameters; a special polishing solution for photochemical mechanical polishing is prepared from an aluminum oxide (Al2O3) grinding material, semi-fine polishing is carried out on a laser crystal sheet, and surface damage caused in the grinding stage is rapidly removed; a special polishing solution for photochemical mechanical polishing is prepared from a zirconium oxide (ZrO2) grinding material, and the laser crystal sheet is finely polished, so that the surface quality and the surface precision are further optimized; an ultrasonic cleaning instrument is adopted to clean the laser crystal slice, and a cleaning agent is absolute ethyl alcohol. According to the invention, high-surface integrity and high-efficiency processing of the laser crystal slice can be synchronously realized.

The invention relates to the technical field of BOPP (biaxially-oriented polypropylene) films, in particular to a scratch-resistant adhesive-free matt film and a preparation method thereof, and the scratch-resistant adhesive-free matt film comprises a matt layer, a core layer and a thermal composite layer which are sequentially arranged, the matt layer comprises co-polypropylene, high-density polyethylene, 2.0-2.5 wt% of linear alkyl silicone (the weight-average molecular weight is 12-150 thousands, and the surface tension is 42-45 mN / m) taking maleic anhydride modified aziridine as a terminal group, and 2000-4000 ppm of spherical polymethyl methacrylate (the particle size D50 is 4.0-5.0 microns); the core layer comprises homo-polypropylene; and the thermal composite layer comprises an ethylene-vinyl acetate copolymer and 2000 to 4000 ppm of a spherical anti-blocking agent. According to the scratch-resistant adhesive-free matt film, through collaborative design of the components of the matt layer and the thermal composite layer, balance of scratch resistance, high surface tension (printing applicability) and winding and unwinding smoothness of the surface of the matt layer is achieved, and a solution for the scratch-resistant generality problem of the matt surface of the high-end BOPP matt film is provided.

The invention provides a laser-induced composite material surface multi-scale micro-texture assisted brazing method which comprises the following steps: step 3, carrying out surface texturing treatment on a to-be-welded surface of a fiber reinforced ceramic matrix composite obtained in step 2 by using a laser in air, and in the laser texturing process, carrying out surface texturing treatment on the to-be-welded surface of the fiber reinforced ceramic matrix composite, the fiber-reinforced ceramic matrix composite material is placed in the center of a laser objective table, then laser with the defocusing amount being-5-5 mm, the laser power being 0-300 W and the laser scanning speed being 5-100 mm s <-1 > is adopted for vertical irradiation, and the textured fiber-reinforced ceramic matrix composite material is obtained; and fourthly, active brazing filler metal is placed between the textured fiber-reinforced ceramic matrix composite obtained in the third step and the to-be-welded face of metal, and brazing assembly is completed. According to the method, the original straight interface reaction layer is textured through a surface material reduction method, and compared with a surface material increase method which is complex in process, harsh in process condition and high in process cost, the economic cost and the labor cost of the process are greatly reduced through the method.

The invention relates to the technical field of high polymer material processing, in particular to a blow molding method of a composite toughened film, which comprises the following steps: step 1, preheating matrix resin in preheating equipment; 2, feeding the mixed raw materials into a double-screw extruder for melt blending; 3, feeding the dried composite particles into a hopper of a single-screw blow molding extruder; 4, adjusting the air volume and the air pressure of the cooling system according to the monitoring result; and 5, the formed film pipe is folded into a flat shape through a guide component and led out through a traction roller, the traction speed and the extrusion speed are coordinated to control the traction ratio, corona treatment is conducted on the surface of the thin film to improve the surface energy, then rolling tension is controlled for rolling, and the rolling tension is controlled according to the elasticity and thickness of the thin film to prevent excessive stretching or loosening. The uniform distribution and proper compatibility of the composite toughening component improve the toughness of the film, and maintain the strength and barrier property of the film.

The invention provides a solvent-free UV dielectric insulation protective coating as well as a preparation method and application thereof. The high-surface-energy and high-glass-transition-temperature UV-curable coating is prepared by combining flexible modified polyurethane acrylate, flexible acrylate, rigid acrylate with high glass transition temperature, a high-functionality acrylate cross-linking agent, methyl methacrylate with high dilutability and high glass transition temperature as well as a plurality of photoinitiators, auxiliaries, pigment and filler powder and the like. The invention relates to a dielectric insulation protective coating with high adhesive force. The prepared coating is a solvent-free 100% solid single component, is complete in mixing and dissolving, convenient to construct, high in light curing energy utilization rate, high in production efficiency and suitable for large-scale automatic large-scale flow line production, and compared with PSA back glue used for a traditional PET blue film, the outer surface of the coating has higher surface energy, and the coating has the advantages of being high in light curing energy utilization rate and high in production efficiency. And the film has considerable dielectric insulation performance and good edge covering protection performance, and meets the development requirements of a higher charging voltage platform of a fast-charging electric vehicle in the future.

The invention discloses an electron beam composite scanning filling melting forming method and device, and relates to the technical field of additive manufacturing. A melting forming method for electron beam composite scanning filling comprises the following steps that a three-dimensional digital model of a part to be printed is established and sliced and layered, and layered scanning data are obtained; dividing a contour edge area and an internal area of the section of the part based on the hierarchical scanning data; based on a random discrete point algorithm, generating a random discrete point scanning path of the contour edge area; generating a continuous line scanning filling path of the internal region based on a parallel equidistant line filling method; in the contour edge area, according to a random discrete spot scanning path, a pulsed electron beam is adopted for spot scanning, filling and melting; and in the internal area, according to a continuous line scanning filling path, a focused electron beam is adopted for line scanning filling melting, single-layer filling melting is completed, and then filling melting is completed layer by layer till the part is formed. According to the method, collaborative optimization of the surface quality and the printing efficiency is achieved, and the problem that at the present stage, the surface roughness of an electron beam powder bed printing part is too high is solved.

The invention discloses high-surface-quality 980MPa-grade hot-dip galvanized dual-phase steel and a preparation method thereof. The high-surface-quality 980MPa-grade hot-dip galvanized dual-phase steel is prepared from the following components in percentage by mass: 0.05 percent to 0.11 percent of C, 0.5 percent to 0.9 percent of Si, 2.1 percent to 2.5 percent of Mn, 0.03 percent to 0.05 percent of Nb, 0.04 percent to 0.06 percent of Ti, 0.13 percent to 0.28 percent of Mo, 0.02 percent to 0.05 percent of Als and the balance of iron and inevitable impurities. According to the method, through innovative humidification annealing and oxidation-reduction dual-process collaborative parameter design, the annealing dew point and the oxygen content are controlled in a segmented mode, stable control over the galvanized surface quality of the high-Si and Mn dual-phase steel is achieved, the effect of improving thick-specification products is obvious, the overall qualification rate is greatly increased, element external oxidation is inhibited, the coating quality is optimized, the production efficiency is improved, and the method is suitable for large-scale popularization and application. The problem of surface peroxidation or zinc layer falling easily caused by a traditional single process is solved, and the high-end requirement for high-performance steel is met.

The invention belongs to the field of advanced scientific devices integrating optics, quantum mechanics, atomic physics and a vacuum technology, and particularly relates to a glass vacuum cavity and a manufacturing method thereof.The manufacturing method includes the steps that the inner surfaces of window pieces are machined firstly, an inner working face with high surface shape precision can be obtained, and after the inner surfaces are machined, the four window pieces are plated with films, and the working faces are plated with antireflection films; the optical cement surface is plated with an optical cement auxiliary film, and the diffraction film is rubbed after the optical cement surface is plated with the film, so that the optical cement strength is ensured to be optimal. After every two of the four window sheets are subjected to optical cement deepening, the outer surfaces are processed, and when the outer surfaces are processed, the inner surfaces are protected, so that the quality of a film layer is not damaged. By means of the method that optical processing, film coating and optical cement deepening are conducted on the inner surface alternately, and then optical processing, film coating and optical cement deepening are conducted on the outer surface alternately, the glass vacuum cavity which is high in window piece surface shape precision, high in window piece parallel precision, high in combination strength and good in air tightness, and the film layer surface quality is not prone to pollution or damage can be machined.

The invention relates to a composition for a biomimetic material and a preparation method of the composition. The composition comprises hydrophobic modified hydroxyapatite, polylactic acid and a hyperbranched star polymer with a hyperbranched polymeric structure as a core and polycaprolactone as an arm. The invention also relates to a product containing the composition for the biomimetic material. According to the application, the hyperbranched star-shaped polymer taking a hyperbranched polymerization structure as a core and polycaprolactone as an arm is creatively introduced into a PLA / HA composite system, and the hyperbranched star-shaped polymer can effectively improve the compatibility among the components and also can reduce the shrinkage rate of the composition for the biomimetic material. The composition for the biomimetic material can be processed to prepare a 3D printing wire rod with good toughness and high surface quality. According to the 3D printing wire rod, through the 3D printing technology, the manufactured bionic support is good in mechanical performance and size stability, and the printing process is smooth.

The invention relates to the technical field of batteries, in particular to a negative plate and a preparation method thereof, a battery and electric equipment. The negative plate comprises a negative current collector; and the negative electrode active material layer is positioned on the surface of at least one side of the negative electrode current collector, and the negative electrode active material layer contains an active material and porous ceramic. According to the negative plate, the porous ceramic material in a certain proportion is added, so that the diffusion rate of an electrolyte in the negative plate can be effectively increased, the infiltration and liquid retention capabilities of the electrolyte on the negative plate are improved, the diffusion rate of lithium ions in the negative plate is increased, and the fast charging capability can be obviously improved under the condition of high surface density.

The invention relates to the technical field of nano-generators, in particular to a triboelectric material of nano-porous composite fibers and a preparation method and application of the triboelectric material of the nano-porous composite fibers, and the preparation method comprises the following steps: adding polyvinylidene fluoride and perfluoroethylene propylene copolymer nanoparticles into a mixed solvent of N, N-dimethylacetamide / acetone; uniformly mixing to obtain a polyvinylidene fluoride / perfluoroethylene propylene copolymer nanoparticle spinning emulsion; and carrying out electrostatic spinning on the polyvinylidene fluoride / perfluoroethylene propylene copolymer nanoparticle spinning emulsion to obtain the triboelectric material. The triboelectric material prepared through the method is a high-charge-density super-hydrophobic nano-generator material based on electrostatic spinning, the electrostatic spinning porous composite fiber material is used as a friction medium layer, high surface charge, hydrophobicity and fouling resistance are achieved, and the performance of a flexible solid-liquid interface nano-generator is improved.

The invention discloses a plasma-enhanced nonlinear conductive coating and a preparation method and application thereof. The preparation method comprises the following steps: coating the surface of an insulating substrate with a composite coating, carrying out induction treatment under the action of an electric field, and curing to obtain the coating, the composite coating comprises a nonlinear conductive material and a coating matrix, wherein the nonlinear conductive material and / or the insulating base material are / is subjected to plasma treatment. According to the method, the nonlinear conductive material can have good nonlinear conductive characteristics under low doping amount through plasma treatment, and meanwhile, three combination effects of mechanical interlocking, physical adsorption and chemical bonding can be introduced on the surfaces of the coating and the insulating base material at the same time through the impact effect of plasma high-energy particles; and the adhesive force of the coating on the surface of the insulating base material is strengthened. The coating obtained by the invention can show remarkable nonlinear conductivity under the condition of low filler doping amount, and compared with a coating in the prior art, the coating has better surface charge regulation and control effect, higher surface flashover voltage and stronger basic adhesive force.

The invention relates to the technical field of material surface engineering, and discloses a plastic surface treatment process to solve the problems that in the prior art, a plastic surface coating is poor in adhesive force and single in function, and a traditional treatment method is not environmentally friendly. The process sequentially comprises the following steps: pre-treating a base material, and obtaining a clean and stress-free base material through ultrasonic cleaning and thermodynamic stress elimination; performing low-temperature plasma surface activation, performing physical bombardment and chemical modification on the plastic surface by utilizing plasma of specific process gas in a vacuum environment, introducing a large number of active functional groups, and remarkably improving the surface energy; and preparing and applying the functional nano coating, namely forming firm covalent bonds by using the coupling agent in a coating solution containing functional nano particles and a coupling agent and the anchor points, so that the chemical coupling of the functional coating and the plastic substrate is realized.

The invention belongs to the technical field of satellite-borne optical remote sensing imaging, and relates to a multi-point flexible adhesive supporting structure of a large-aperture satellite-borne rectangular lens group and an integration method. The supporting structure comprises a rectangular mirror body, an integrated rectangular mirror frame and an anti-radiation back plate; the rectangular mirror body is embedded into the integrated rectangular mirror frame; the integrated rectangular mirror frame is detachably connected with the anti-radiation back plate; bonding ring assemblies are mounted on the periphery of the integrated rectangular mirror frame, and the four side faces of the periphery of the rectangular mirror body are fixedly connected with the bonding ring assemblies in a bonding mode; the lower side bonding ring assembly and the upper side bonding ring assembly are matched in a one-rigid-one-flexible mode, and the right side bonding ring assembly and the left side bonding ring assembly are matched in a one-rigid-one-flexible mode. And the one-rigid and one-flexible matching form is that one component adopts a rigid structure, and the other component adopts a flexible structure. The problems of high surface shape precision microstress, high stability, space radiation resistance, universality of a supporting structure and the like of an existing satellite-borne rectangular mirror body are solved.

The invention discloses a surface treatment method and system for a forming engineering material, and relates to the technical field of material surface treatment.The surface treatment method comprises the steps that material surface characteristics and surface quality standards of the forming engineering material are read; measuring the characteristic amplitude modulation of the material surface characteristics and the surface quality standard, and identifying the characteristic correlation; on the basis of feature amplitude modulation and feature correlation, in combination with an adaptive decision model, performing intra-layer independent analysis and inter-layer collaborative analysis, and optimizing a decision to determine a surface treatment scheme; configuring the intelligent central control system; with the exception handling features as indexes, industrial big data retrieval is performed, a regulation and control plan library is constructed, and an autonomous calibration rule based on control deviation is set; configuring the digital feedback device; and performing closed loop control on the surface treatment of the forming engineering material. The technical problem that in the prior art, real-time and accurate control over the material surface quality is difficult is solved, and the technical effect of improving the surface treatment efficiency and quality is achieved.

The invention relates to the field of building materials, in particular to nano-silver solder paste with high welding strength and a preparation method of the nano-silver solder paste. The nano-silver tin paste with high welding strength comprises the following raw materials: nano-silver powder, nano-tin powder, composite resin, a dispersing agent, an activating agent, a film-forming agent, a thixotropic agent, silicon-titanium particles, a stabilizing agent and the like. According to the nano-silver solder paste with the high welding strength and the preparation method thereof, uniform dispersion of an internal system is achieved, the welding effect and the welding performance are further optimized, the oxidation resistance can be greatly improved, the probability that high surface energy of nano-silver is prone to being oxidized to generate silver oxide is greatly reduced, and the welding quality of the nano-silver solder paste is improved. The silver solder paste prepared by the method further balances the balance between the preparation process and the high strength of the silver solder paste, and has excellent stability and mechanical strength, thereby meeting the requirements of high-reliability packaging in the prior art, and having wide application potential.

The invention relates to the technical field of die-casting dies, in particular to a metal die-casting die with a material taking mechanism, which comprises a fixed die, a movable die, an ejection mechanism and a guide mechanism, the ejection mechanism and the guide mechanism are arranged on the movable mold; the ejection mechanism comprises an ejection plate and a linear driver, the ejection plate is arranged in a cavity of the movable mold, the linear driver is mounted on the movable mold, and the driving end of the linear driver is in transmission connection with the ejection plate; the guide mechanism comprises two guide plates movably arranged on the movable mold, and the two guide plates are located on the two sides of the cavity correspondingly. According to the die-casting die, the function of guiding the casting to fall off when the casting is ejected out is achieved, the situation that the casting collides with other objects or is clamped in the falling process is avoided, and the problem that the casting cannot fall off accurately in the taking process of a traditional die-casting die is solved. Casting ejection is conducted through the ejection plate, ejection work can be conducted on castings such as thin-wall shells or deep-cavity parts with the high surface smoothness requirement, local stress is reduced through large-area contact, and the casting quality is guaranteed.

The invention discloses an overflow groove for assisting in preparing a wick and a wick preparation method, and belongs to the technical field of wick preparation. The overflow groove comprises a second groove body, a liquid inlet pipe and a frame body; the liquid inlet pipe is communicated with the second tank body and the outside of the overflow tank, two non-adjacent surfaces in the frame body are hermetically connected with two non-adjacent surfaces in the second tank body, a gap is reserved between the other two surfaces in the frame body and the other two surfaces in the second tank body, the gap is used for accommodating a to-be-processed workpiece during auxiliary preparation of the wick, and an overflow port is formed in the frame body; in the preparation process, through coupling of high-speed movement of the laser galvanometer and workpiece movement and coupling of continuous machining of liquid and air, preparation of a large-breadth groove structure can be achieved, and meanwhile the size of the groove is easy to adjust. According to the method, through the design of the overflow groove, the preparation process is made into one step, high-surface-quality, high-flexibility and efficient machining of the ultra-thin metal surface large-depth-to-width-ratio primary groove structure is achieved, and the machining efficiency of the multi-stage groove structure is improved.

The invention discloses a composite material hollow plate and a preparation method, and belongs to the technical field of composite material plate preparation. The composite material hollow plate comprises an outer plate and an inner plate, a plurality of corrugated supporting structures are connected between the outer plate and the inner plate, and a cavity is formed between every two adjacent corrugated supporting structures. A wear-resistant reinforcing agent is added into an outer plate material to improve the surface wear resistance, an epoxy-amine dual-core double-wall microcapsule is introduced into an inner plate material to enhance the crack repairing capacity, and a shape memory reinforcing agent is added into a corrugated supporting structure material to endow the material with the shape memory characteristic. The invention solves the technical problems of difficulty in consideration of strength and toughness, short service life, poor buffer performance, insufficient interface bonding strength and the like of the existing composite material hollow plate, and is particularly suitable for steel coil packaging and other application scenes requiring repeated use and high reliability.

The invention discloses polyimide with high surface electric strength based on surface natural microporous structure regulation and a preparation method and application thereof, and belongs to the technical field of high-voltage insulating materials. Dried diamine is dissolved in a solvent A, dianhydride is added, and after uniform stirring, a polyamide acid solution is obtained; adding a pore-forming agent, and stirring at a high speed until the mixture is uniformly dispersed to obtain a mixed viscous solution C; after coating, drying, imidization high-temperature heating and natural cooling, immersing into the liquid B to extract the pore-forming agent, and drying to obtain the high-surface electric strength polyimide based on surface natural microporous structure regulation and control. The surface of the polyimide has a natural porous structure, the surface is a surface along an electric field and a through hole structure densely distributed along the surface of the electric field, and electrons are easy to fall into the through hole structure and are difficult to return to the surface in a jump multiplication process during flashover, so that a secondary electron multiplication process is inhibited, the probability of forming secondary electron collapse is reduced, and the flashover effect is improved. Therefore, the along-surface electric strength is improved.

Chemically treating ionically conductive sulfide glass solid electrolyte separators or separator layers can improve performance. In particular, treatment involving chemically etching a surface or surface region of the sulfide glass separator to blunt, lessen or remove edge defects or surface flaws, and / or to enhance surface smoothness is cost effective, reliable and well suited for high production environments compared to physical methods of removing scratches or smoothing surfaces, such as mechanical grinding and polishing.

The embodiment of the invention provides a silicon wafer lifting method and a silicon wafer, and the method comprises the steps: completely cutting a crystal bar into silicon wafers through a cutting line, and controlling the silicon wafers to move upwards; and in the process of controlling the silicon wafer to move upwards, controlling the cutting line to alternately and circularly move in the positive and negative directions. According to the silicon wafer lifting method provided by the embodiment of the invention, the contact area of the silicon wafer clamping the cutting line is smaller by utilizing the characteristic that the wire bow of the forward and reverse routing is smaller than that of the one-way routing, so that the probability that the cutting line forms scratches on the surface of the silicon wafer in the lifting process can be reduced, the condition of wafer falling during lifting can be reduced, and the lifting efficiency of the silicon wafer is improved. The method has the advantages of fast speed increase, high surface quality of the prepared silicon wafer and small secondary damage.

The invention relates to a high-strength and high-elasticity organic silicon light-cured 3D printing material and a preparation method thereof.The preparation method comprises the steps that multi-arm vinyl silicone oil with macrocyclic phenyl siloxane as a core, a polysiloxane polymer containing silicon-hydrogen groups, filler and auxiliaries are mixed and stirred to be uniform according to the mass percent, then a photoinitiator is added, the mixture is stirred to be uniform, and the high-strength and high-elasticity organic silicon light-cured 3D printing material is obtained; the organic silicon photosensitive resin material is prepared. According to the preparation method, the ultraviolet light is adopted to initiate local short-time curing of the addition type organic silicon material, rapid curing forming of the organic silicon material in the photocuring 3D printing process is achieved, and a formed part is colorless and transparent and has good mechanical performance. Vinyl silicone oil used in the process method is multi-arm vinyl silicone oil, has the characteristics of excellent thermal stability, good mechanical property, low dielectric constant, excellent biocompatibility and the like, has a three-dimensional and regular structure and high surface functional group density, and can increase crosslinking sites of hydrosilylation reaction to form a compact crosslinked network structure; the mechanical property of the material is improved.

The invention relates to the technical field of coatings, and discloses a functionalized graphene modified polyurethane composite coating, compared with a labyrinth shielding structure of a traditional polyurethane coating, the functionalized graphene modified polyurethane composite coating added with functionalized graphene can form a more compact film-shaped structure through layer-by-layer superposition of two-dimensional sheet structures of graphene, so that the graphene modified polyurethane composite coating has a good shielding effect. By means of the nanometer size, high surface hydrophobicity and conductivity of graphene, the corrosion rate of metal is reduced, the corrosion resistance and mechanical performance of a coating are improved, aminopyridine can improve the corrosion current and impedance value of a polyurethane coating film, the corrosion resistance of the polyurethane coating film is improved, and the corrosion resistance of the polyurethane coating film is improved. Through a blending preparation means, the chain segment of polyvinyl chloride is compatible with the flexible chain segment of polyurethane, and the mechanical property of the polyurethane coating is further improved.