1395results about How to "Flat surface" patented technology

The invention belongs to the technical field of titanium alloy materials and additive manufacturing, and relates to a high-performance titanium-based composite material based on additive manufacturing and a preparation method of the high-performance titanium-based composite material. The preparation method comprises the following steps that titanium alloy powder subjected to vacuum drying treatment and titanium-coated reinforced phase nanoparticles are added into a ball mill to be subjected to ball milling treatment in the inert gas atmosphere, and evenly-mixed composite powder is obtained; and after the composite powder in the first step is subjected to vacuum drying, the composite powder is evenly laid on a forming base plate through additive manufacturing equipment, the composite powder is molten layer by layer through a heat source, and the high-performance titanium-based composite material is obtained after solidification. According to the titanium-based composite material and the preparation method thereof, TiB generated by the in-situ reaction of the B element in the titanium-coated reinforced phase nanoparticles and the Ti element in selective laser melting forming is adopted, the TiB is uniformly dispersed and distributed in a titanium alloy matrix, the prepared titanium-based composite material has good density, the strength, hardness and other properties of the material are obviously improved, and the comprehensive mechanical property is excellent.

The invention discloses a high-elasticity water-resistant flexible waterborne polyurethane elastic film product, and belongs to the field of waterborne polyurethane elastic film products. The waterborne polyurethane structure contains a strong supramolecular dynamic crosslinking unit and a polysiloxane unit, the strong supramolecular dynamic crosslinking unit has a metal-ligand effect and an optional multiple hydrogen bond effect, and the metal-ligand effect is preformed. In the polymerization process of the waterborne polyurethane, a preformed metal complex with a metal-ligand function serves as a weaving node, and the metal complex serves as a monomer and is cross-linked with a waterborne polyurethane chain segment. Due to the woven cross-linked interweaving structure, macromolecular chains connected to weaving nodes are spontaneously entangled. High polymer chain entanglement, reversibility of dynamic bonds and a cross-linked network endow the film with high strength, high elasticity, high flexibility and high density; meanwhile, the polysiloxane endows the film with water resistance and low viscosity. The waterborne polyurethane elastic film product prepared by adopting the structure is super-flexible, high in elasticity and good in water resistance.

The invention discloses a power chuck machining device capable of compensating clamping and automatically pushing materials, and particularly relates to the field of chuck machining, the power chuck machining device comprises a chuck base, a plurality of clamping jaws are arranged on the chuck base, and the multiple clamping jaws clamp and fix a thin floating disc by synchronously and radially moving along the surface of the chuck base; a supporting piece is arranged on the chuck base and makes contact with the bottom of the thin floating disc. The supporting piece is arranged to support the thin floating disc, the supporting force of the thin floating disc is effectively increased, the possibility that the thin floating disc deforms due to external force in the turning process is reduced, higher rigidity is provided, vibration and bending of the thin floating disc can be effectively restrained, the stability in the machining process is improved, and the machining precision is ensured; and by arranging the adsorption mechanism, the action of force can be more uniformly distributed, vibration is reduced, the turning quality is improved, a smoother surface is obtained, and the size precision and the surface quality in the turning process are further ensured.

According to the yarn structure and the textile thereof, by changing the specification cross section of the yarn and arranging the air flow guide grooves, the fabric can be tightly arranged, more efficient sunscreen can be achieved, ventilation is not blocked, the uvioresistant master batch is added, the fabric of the textile can be arranged more orderly, the surface is smooth and fine, and the fabric is more comfortable to wear. The uvioresistant master batch can reflect or scatter ultraviolet rays to prevent ultraviolet radiation from harming a human body, the uvioresistant master batch comprises a yarn body with a flat section, an air guide groove is formed in the surface of the yarn body, and the uvioresistant master batch is arranged on the yarn body.

The utility model discloses a wafer carrying table assembly, which comprises a wafer carrying table, a heating sheet and a shielding sheet, the wafer carrying table is provided with an adsorption hole for adsorbing a wafer, the heating sheet is arranged below the wafer carrying table, the shielding sheet is arranged above the heating sheet, the shielding sheet can conduct electricity, and the shielding sheet can shield a magnetic field generated by the heating sheet and shield electromagnetic noise. And the influence of a magnetic field generated by the heating sheet on subsequent wafer processing procedures is avoided.

The invention discloses a light-emitting diode epitaxial wafer, a preparation method thereof and a light-emitting diode, and relates to the field of semiconductor photoelectric devices. The light-emitting diode epitaxial wafer sequentially comprises a substrate, a buffer layer, an intrinsic semiconductor layer, an N-type semiconductor layer, a multi-quantum well layer, an electron blocking layer and a P-type semiconductor layer. The P-type semiconductor layer comprises a Si3N4 layer, a first superlattice layer and a second superlattice layer which are sequentially stacked on the electron blocking layer, the first superlattice layer comprises a Mg-doped Al < x > Ga < 1-x > N layer and a Mg-doped GaN layer which are alternately stacked, and the second superlattice layer comprises a non-doped GaN layer and a Mg-doped In < y > Ga < 1-y > N layer which are alternately stacked. By implementing the invention, the luminous efficiency of the light-emitting diode can be improved.

The invention provides high-dispersity superfine copper powder and a preparation method thereof, and belongs to the technical field of metal materials. The preparation method comprises the following steps: mixing a copper-containing solution, an alkali-containing solution and a reducing agent solution, and reacting to obtain a cuprous oxide precursor; and mixing the cuprous oxide precursor solution, the dispersing agent solution and the reducing agent solution, and reacting to obtain the superfine copper powder. According to the method, a traditional one-step liquid phase synthesis method for the superfine copper powder is abandoned, a two-step method is creatively adopted for preparing the superfine copper powder, and the contradiction between the size of copper particles and the technological capacity is solved. According to the preparation method, the copper particles with smaller sizes can be prepared on the premise that high unit volume productivity is kept, and the prepared copper particles are smooth in surface and uniform in size.

The invention provides a preparation method of a micro TiAl alloy wire, and relates to the technical field of TiAl alloy preparation. The preparation method comprises the steps of raw material selection and treatment of a wire material, raw material twisting of the wire material, continuous warm drawing of a primary TiAl composite stranded wire, twisting of the primary TiAl composite wire, continuous warm drawing of a secondary TiAl composite stranded wire, repeated warm drawing of the TiAl composite wire, continuous extrusion of the TiAl wire and diffusion homogenization of the TiAl alloy wire which are sequentially carried out. According to the preparation method, the TiAl alloy wire with uniformly distributed components can be directly prepared at a lower temperature by combining multiple wire twisting, multiple continuous hot drawing and final diffusion homogenization annealing, the high-temperature melting process is effectively avoided, the components and the diameter of the TiAl alloy wire can be designed according to the requirements of the target TiAl alloy wire for the passes in the preparation and extrusion process of the TiAl composite wire, and the preparation process of the TiAl alloy wire is simplified. The method is high in flexibility, simple to operate, wide in application, low in cost and very suitable for large-scale industrial production.

The invention provides a mixed bonding surface planarization process method of a wafer and chemical mechanical polishing equipment. The method comprises the following steps: controlling a grinding head to adsorb a first wafer to be subjected to surface planarization treatment, and grinding the first wafer on a first grinding pad to remove a copper film above a groove of the first wafer so as to obtain a second wafer; controlling the grinding head to move to a second grinding pad, and grinding the second wafer on the second grinding pad so as to remove the dielectric layer of the second wafer, the barrier layer above the dielectric layer and copper with the same thickness as the dielectric layer in the groove, and obtaining a third wafer with an exposed interface layer; controlling the grinding head to move to a third grinding pad, and grinding the third wafer on the third grinding pad, so that the surface height of the interface layer is the same as the surface height of the copper in the groove, and obtaining the wafer with the flattened surface; wherein the hardness of the third polishing pad is smaller than the hardness of the first polishing pad and the hardness of the second polishing pad. According to the invention, the wafer with a flat and smooth surface can be obtained.

Compared with a porous microsphere in the prior art, the polymer material microsphere with the closed hollow structure is provided with the closed hollow structure or a gas chamber, the surface of the microsphere is smooth on the whole, and acute inflammatory reaction can be avoided. By adopting the microspheres prepared by the invention, the total material implantation amount can be reduced when the same regenerative stimulation point is implanted; and the preparation process is simple, and large-scale production is facilitated.

The invention relates to the technical field of insulation blankets, and discloses a light high-strength grid insulation blanket high-temperature rubber forming process, selected silicone rubber or fluororubber has excellent temperature resistance, can stably work in a temperature range of 40-+ 250 DEG C, and meets application requirements in a high-temperature environment; by adding the high-strength Kevlar glass fibers or aramid fibers, the mechanical strength of the product is remarkably improved, and the product is more durable and tear-resistant. The main rubber material formed by mixing the NR, the SBR and the IIR is adopted, so that the good electrical insulation performance of the product is ensured; by adding light fillers such as hollow glass beads and ceramic microspheres, the overall weight of the product is reduced, the binding force between a rubber matrix and reinforced fibers is enhanced by a surface pretreatment process, molding defects are reduced, and the overall quality of the product is improved. The use of the hot air circulation vulcanizing box ensures that the product is uniformly heated in the vulcanizing process, so that the vulcanizing effect is optimized, and the performance stability of the product is improved.

The invention discloses a ceramic / high-entropy alloy composite particle reinforced aluminum-based composite material and a laser additive manufacturing method thereof. Firstly, ceramic / high-entropy alloy composite powder and aluminum alloy powder are mixed through ball milling to obtain ceramic / high-entropy alloy composite particle reinforced aluminum alloy composite powder, then the composite powder of the three components is laid on a powder bed, laser power, scanning speed, scanning spacing and the like are adjusted, and laser scanning melting solidification is conducted to prepare the ceramic / high-entropy alloy composite particle reinforced aluminum alloy composite powder. And the ceramic / high-entropy alloy composite particle reinforced aluminum-based composite material is formed. The composite material disclosed by the invention is highly compact, so that the ceramic / high-entropy alloy composite particles can effectively improve the mechanical property of the aluminum-based composite material, and can be used for manufacturing high-performance complex parts for aerospace, automobile rail transit and the like.

The invention provides an enamel veneering repair material and a preparation method thereof, and belongs to the technical field of ceramic forming products. In order to further improve the attaching property of a tooth veneering material, reduce the amount of abraded tooth tissues and reduce the risks of ceramic collapse and falling off. Zirconium oxide, aluminum oxide, hydroxyapatite, silica dimethylsilylate, silicon dioxide, fluorapatite, magnesium oxide, thermosetting acrylic resin, aluminum hydroxide gel, a silane coupling agent, polyvinyl alcohol, sodium phytate and the like are adopted as raw materials, all the components are matched according to a certain proportion, and a special technology is adopted for preparing the tooth patch. While good biocompatibility, high hardness and wear resistance are ensured, the adhesion can be further improved, the removal amount of tooth tissues by grinding is reduced, the risks of ceramic collapse and falling are reduced, the service life is prolonged, and better use experience is provided.

The invention discloses a waterproof and corrosion-resistant photoelectric composite cable, and belongs to the technical field of communication cables. The waterproof and corrosion-resistant photoelectric composite cable comprises a cable core composed of an optical unit and an electric unit, aramid yarn, an inner protective layer, a waterproof layer, an anti-corrosion layer and an outer sheath, the optical unit comprises an optical fiber and a protective sleeve outside the optical fiber, and the electric unit comprises a conductor and an insulating layer outside the conductor; the aramid yarn and the cable core are twisted in a spiral mode and wrapped by an inner protection layer in an extruded mode, the inner protection layer is wrapped by a water blocking layer, the water blocking layer is wrapped by an anti-corrosion layer, and the anti-corrosion layer is wrapped by an outer sheath. The inner protective layer is made of a waterproof high-temperature-resistant insulating polyurethane composite material; the outer sheath is made of a flame-retardant corrosion-resistant PUR composite material; the waterproof and corrosion-resistant photoelectric composite cable is simple in structure, has high strength and high toughness, has excellent waterproofness, corrosion resistance, aging resistance, high temperature resistance, wear resistance and flame retardance, and still keeps better use performance and longer service life in harsh environments such as underwater or underground.

The invention belongs to the field of biological medicine, and particularly relates to a polycaprolactone microsphere with narrow particle size distribution and a preparation method thereof. The preparation method comprises the following steps: S1, dissolving polycaprolactone in an organic solvent to obtain an oil phase solution; s2, adding an emulsifier into water, and stirring until the emulsifier is completely dissolved to obtain a water-phase solution; s3, adding the water-phase solution into the oil-phase solution while stirring to obtain a primary emulsion; s4, enabling the primary emulsion to pass through membrane holes of a membrane tube under a pressurization condition, forming polycaprolactone liquid drops in the aqueous phase solution, and taking away the polycaprolactone liquid drops by the circularly flowing aqueous phase solution to obtain a suspension emulsion; s5, stirring the suspension emulsion, removing the organic solvent, and curing the microspheres to obtain a polycaprolactone microsphere suspension; s6, the polycaprolactone microsphere suspension is washed with water and sieved, and wet pellets are obtained; s7, the wet pellets are collected, dried and screened, the polycaprolactone microspheres are obtained, the yield is high, the particle size is uniform, and the particle size span is smaller than or equal to 0.8.

The invention relates to the field of antistatic PVC (polyvinyl chloride) materials, in particular to a preparation method, a product and application of an antistatic pre-dispersion for a PVC film. The antistatic pre-dispersion for the PVC film is prepared by preparing an antistatic agent from an aminated ionic liquid-CNT compound and carboxylated Mxene, and mixing the antistatic agent with a plasticizer, an auxiliary dispersant and a hyperbranched flow improver. PVC resin and the like can be further combined to prepare a coating, and the coating and base cloth are prepared into a PVC film structure material to serve as an antistatic PVC material. The antistatic pre-dispersion prepared by the invention has good dispersibility in PVC resin, is slightly influenced by environmental temperature / humidity, and has a lasting antistatic effect. Meanwhile, the PVC film structure material prepared by using the antistatic pre-dispersion disclosed by the invention is good in wear resistance, not easy to migrate, stable in performance and relatively long in service life.

The invention discloses an aluminum alloy large-gap MIG welding method which comprises the following steps: firstly, determining the thickness position and the welding direction of a fillet weld of a to-be-welded workpiece, determining welding current according to the thickness of the to-be-welded workpiece, and continuously heating a molten pool by adopting a delay staying method in an arcing stage; s2, in the welding stage, switches of the robot and the MIG welding machine are turned on, and a MIG welding gun walking path program carried by the welding robot is compiled; an MIG welding gun carried by the robot swings in a Z shape and swings back and forth, a double-pulse scheme is adopted in the welding process specification, according to the welding current scheme, the welding current is determined according to the thickness of the aluminum alloy, the welding parameter of welding swing in the forward direction is small current, and the welding parameter of welding swing in the backward direction is large current; and after swinging of the welding gun is finished, the welding gun continuously moves for a certain distance, and the welding gun moves to a welding end point. Effective welding can be achieved under the working conditions of different thicknesses and large gaps, and the welding quality is improved.

The invention provides an aluminum-based composite material reinforced by nickel-coated silicon carbide through a magnetron sputtering dry method and a preparation process of the aluminum-based composite material, and relates to the technical field of metal-based composite materials and advanced electronic packaging thermal management materials. Comprising the following steps that S1, silicon carbide particles coated with nickel through a magnetron sputtering dry method and aluminum powder are put into a mold to be subjected to compression molding, and an initial blank is obtained; and S2, the initial blank prepared in the step S1 is placed in a re-pressing sintering furnace under the inert gas protection condition, continuous re-pressing is conducted under the temperature condition ranging from the temperature lower than the aluminum melting point by 50 DEG C to the temperature higher than the aluminum melting point by 200 DEG C, and the nickel-coated silicon carbide reinforced aluminum-based composite material obtained through the magnetron sputtering dry method is obtained. The aluminum-based composite material reinforced by magnetron sputtering dry nickel-coated silicon carbide disclosed by the invention is excellent in heat-conducting property and mechanical property and long in service life.

The invention relates to the field of thermal spraying ceramic coatings, and particularly discloses plasma spraying ceramic powder, a ceramic composite coating and a preparation method of the ceramic composite coating. The plasma spraying ceramic powder is prepared from the following raw materials in parts by weight: 100 parts of nano powder and 10 to 30 parts of silicate glass powder, the nano powder comprises nano Al2O3 powder, nano TiO2 powder, nano CeO2 powder and nano YSZ (Yttria Stabilized Zirconia) powder in a weight ratio of (80-86): 10: 2: (2-8). The plasma spraying ceramic powder has the beneficial effects of being good in fluidity, smooth in surface, high in compactness and good in sphericity degree, and the prepared ceramic composite coating has the beneficial effects of being low in porosity, high in compactness, good in corrosion resistance and long in service life.

The invention relates to the field of package printing, in particular to a skin feeling effect printing method for cigarette case packaging paper. The printing method comprises the following steps that in the same offset printing equipment, 1) UV base oil printing is firstly conducted on the surface, printed with patterns and / or characters, of the cigarette case packaging paper; (2) after the step (1), printing a skin-touch ink layer; skin-touch ink adopted in the skin-touch ink layer is prepared from the following raw material components in parts by weight: 10 to 30 parts of first polyurethane resin, 60 to 80 parts of acrylate copolymer, 1 to 5 parts of polydimethylsiloxane, 1 to 5 parts of polyethylene wax, 1 to 5 parts of triethylamine and 40 to 50 parts of solvent. The printing method is achieved through one-time printing, UV base oil printing is conducted firstly, the leveling effect is obtained, the production efficiency is improved, the requirement for pre-printing file processing and the degree of dependence on equipment are reduced, the proofing difficulty is reduced, the water resistance, binding strength and abrasion resistance of an ink layer are improved, and the printing method has wide market application prospects.

The invention provides an Angong bezoar pill as well as a preparation method and application thereof, and relates to the technical field of traditional Chinese medicines. The preparation method comprises the following steps: (1) crushing rhizoma coptidis, radix scutellariae, radix curcumae and fructus gardeniae to obtain mixed powder A of which the particle size D90 is 26-45 microns and the particle size D50 is 13-21 microns; (2) treating pearl, cinnabar and realgar with water to obtain mixed powder B; (3) crushing calculus bovis and musk to obtain mixed powder C; (4) crushing the cornu bubali concentrated powder and borneol to obtain mixed powder D with the particle size of 80-120 meshes; (5) mixing the mixed powder B, the mixed powder D, the mixed powder A accounting for 40-60% of the weight of the formula and the mixed powder C accounting for 20-50% of the weight of the formula to obtain a honeyed pill core layer; and coating the rest components to the surface of the honeyed pill core layer. The Angong bezoar pill prepared by the preparation method disclosed by the invention is smooth and fine in surface, and has the remarkable effects of clearing away heat and toxic materials and quickly resisting convulsion.

The invention relates to the field of fire hoses, and provides a flame-retardant high-strength fire hose and a preparation method thereof.The fire hose sequentially comprises an outer protection layer, a flame-retardant layer, a woven layer, a reinforcing layer and a lining layer from outside to inside; the flame-retardant layer contains a surface-modified magnesium hydroxide micro-tube coated flame retardant, so that the flame-retardant effect is enhanced; the reinforcing layer contains the surface-modified bead-shaped silicon carbide nanowires, so that the mechanical property of the reinforcing layer can be remarkably improved. The five-layer composite structure and the design of multiple functional materials are adopted, comprehensive improvement of flame retardance, mechanical property, use convenience and the like is achieved, the problem that a traditional fire hose is insufficient in flame retardance and mechanical property is solved, and the fire hose has wide application value.

The invention relates to the technical field of non-woven fabrics, in particular to a hydrophobic non-woven fabric and a preparation method thereof.The preparation method comprises the steps that perfluorodecanethiol and octavinyl polysilsesquioxane are used as raw materials to react to generate fluorine-containing polysilsesquioxane, then the fluorine-containing polysilsesquioxane is dispersed in an ethanol solution to form a hydrophobic modified solution, and the hydrophobic modified solution is added into the hydrophobic modified solution to prepare the hydrophobic non-woven fabric. Fluorine-containing polysilsesquioxane molecules in the hydrophobic modification solution not only have the organic-inorganic hybridization characteristic of polysilsesquioxane, but also contain hydrophobic groups of perfluorodecanethiol, so that the hydrophobic modification solution has excellent hydrophobic performance, the antibacterial non-woven fabric with the surface coated with silver-loaded chitosan is subjected to impregnation modification, and the antibacterial non-woven fabric with the surface coated with perfluorodecanethiol has excellent antibacterial performance. According to the present invention, with the silver-loaded chitosan, the fluorine-containing polysilsesquioxane molecules can be adsorbed and attached to the surface of the non-woven fabric to form the compact hydrophobic layer, the good antibacterial property of the non-woven fabric can be maintained due to the existence of the silver-loaded chitosan, and the chemical bond formed by the fluorine-containing polysilsesquioxane and the surface of the non-woven fabric is stable so as to achieve the good antibacterial property; the modified non-woven fabric keeps stable hydrophobic performance and antibacterial performance.

The present invention provides a kind of spherical gold powder and preparation method thereof, relate to the technical field of precious metal powder preparation, the preparation method uses aqua regia to prepare chloroauric acid solution, and uses concentrated hydrochloric acid to adjust pH to 1.5-2, then adds ammonia water to adjust pH to 7-9, stirs 20-60s, then adds concentrated hydrochloric acid to adjust pH to 1.2-2 again, obtains mixed solution B;Then, the first dispersant solution is poured into the aforementioned mixed solution B, after stirring evenly, the mixed solution A of the second dispersant and the reducing agent is quickly added, after stirring reaction, sedimentation, post-treatment, obtains spherical gold powder. Wherein, spherical gold powder of different sizes with a particle size within the range of 0.3-4 μm can be prepared by adjusting pH twice, and adding two different dispersants in a specific order of addition can make the prepared spherical gold powder uniform in particle size, good in dispersibility, regular in shape and smooth in surface. The preparation method reacts rapidly, the process is short and stable, and it has been stably expanded to 500g, which can realize large-scale industrial production.

The invention provides a hot runner shoe sole forming device and method, and relates to the technical field of thermoplastic, the hot runner shoe sole forming device comprises a base, an upper mold, a lower mold, a heating assembly and an injection molding pipe; four limiting rods are fixedly arranged on the upper surface of the base, a top plate is fixedly arranged on the outer walls of the four limiting rods, an oil cylinder is installed on the top of the top plate, a connecting rod is installed at the output end of the oil cylinder, and the bottom of the connecting rod is fixedly installed on an upper mold. When injection molding is finished, viscous master batches existing at the bottom end opening of the injection molding pipe and a forming piece in the lower mold can form a viscous triangular small water gap, so that after injection molding is finished, the movable plate can automatically reset to a closed state along with the departure of the injection molding pipe, and in the closing process, the side face of the movable plate can move to eliminate the viscous triangular water gap; in this way, it can be guaranteed that the surface of a formed part is smoother, workers do not need to eliminate small water gaps for the second time, and the situation that sharp water gaps injure the workers is avoided.

The invention discloses a metal object outer surface wall polishing control method based on a laser beam processing technology, which relates to the technical field of metal polishing, and comprises the following steps: establishing a surface morphology numerical model of a metal object outer surface wall, and simulating the change rule of the surface morphology in the polishing process; selecting a Gaussian laser heat source, setting laser beam parameters, and establishing an instantaneous laser state numerical model; the appearance of the outer surface wall of the metal object is improved in a melting flow mode and a vaporization removal mode; the temperature field distribution and the surface appearance change of the outer surface wall of the metal object under different laser parameters are researched; judging whether micro cracks appear on the outer surface wall of the polished metal object or not; evaluating the polishing effect of the outer surface wall of the metal object under each group of qualified laser parameters; and outputting the optimal laser parameter configuration combination suitable for the current polishing task. Through a method of combining numerical simulation and experimental analysis, the change rule of the surface topography in the polishing process is simulated, and the micro-crack phenomenon after polishing is specifically studied.

A heel backer shaper comprises a case, a last-compressing ironing base, a last rotation mechanism, a shaping wheel, an automatic selector switch, and a footboard. One side of the upper half of the case is not closed. The last rotation mechanism is disposed on the upper half of the case. The last rotation mechanism comprises a cylinder and a rotary table; the rotary table is disposed at the top of the cylinder; the last-compressing ironing base is disposed on the top inner wall of the case and right faces the rotary table. During heel shaping, the heel backer shaper can adjust the operating performances, such as the position of the shaping wheel on a backer, knocking force, ironing temperature and delay time, according to the quality conditions of a shoe so as to acquire optimal shaping effect; during normal working, the heel backer shaper can operate in an automatic manner; an electrothermal plate on the last-compressing ironing base is controlled via a three-compartment closed-loop controlled silicon voltage regulator, temperature control precision is greatly improved, a temperature difference can be controlled within a 10 DEG C range, and the plane of the shaped backer is flat, with clear edge and smooth wrinkle-free surface.

The invention relates to the technical field of seed screening, in particular to an optimization device for trichosanthes kirilowii maxim seed seedling raising, which comprises a worktable with a cavity, an optimization box is slidably connected to the bottom of the inner side of the worktable, a plurality of cross rods are fixedly connected to the inner wall of the optimization box, one end of each cross rod is fixedly connected with an inclined rod, and a winnowing assembly is mounted on the inner wall of the worktable. A layering assembly for knocking the inclined rod and driving the trichosanthes kirilowii maxim seeds in the optimization box to move directionally is mounted in the workbench; the layering assembly comprises a transverse plate fixedly connected with the inner wall of the workbench, a sleeve is installed between the transverse plate and the optimization box, and a rotating assembly and a lifting assembly which are used for driving the sleeve to rotate and lift are installed on the transverse plate. The problems that when seed screening equipment is used for specific gravity screening, large noise can be generated, the occupied space is large, meanwhile, the seed screening structure is difficult to continue to be optimized, impurities in seeds are difficult to reduce, and therefore the requirement for high-quality breeding is met are solved.

The invention relates to a preparation method of a double-layer photo-thermal membrane distillation material, and belongs to the technical field of membrane distillation. According to the double-layer film, a polyvinylidene fluoride super-hydrophobic film serves as a hydrophobic base layer, a carbon nano tube / nano semiconductor material composite nano film serves as a photo-thermal layer, and the photo-thermal layer is attached to the hydrophobic base layer through polyurethane. The preparation method is characterized by comprising the following steps: (1) preparing an electrostatic spinning polyvinylidene fluoride super-hydrophobic membrane; and (2) preparing the electrostatic spinning carbon nano tube / nano semiconductor material composite nano film. Meanwhile, the invention provides a photo-thermal driving membrane distillation device. The double-layer photo-thermal membrane distillation material prepared by adopting the method has good photo-thermal conversion capacity, relatively high water vapor flux and long-term stability, and has a wide application prospect in the aspect of fresh water treatment.

The invention provides anti-scattering water-guided laser cutting fluid as well as a preparation method and application thereof. The anti-scattering water-guided laser cutting fluid comprises the following components in parts by weight: 0.1-1 part of an anti-scattering agent; 0.01 to 0.1 part of a foam discharging agent; 1-5 parts of a refractive index regulator; and 80-99 parts of ultrapure water. The anti-scattering agent is a polymer; the foam removing agent is one or more of hydroxymethyl cellulose, hydroxy propyl cellulose, sodium lignin sulfonate, potassium lignin sulfonate and naphthalene sulfonic acid formaldehyde condensate sodium salt; the refractive index regulator is an iodine-containing compound and / or a fluorine-containing compound. According to the anti-scattering water-guided laser cutting fluid, light beam scattering and energy loss in the water-guided laser cutting process can be remarkably reduced, and the cutting precision and efficiency are improved. The anti-scattering water-guided laser cutting fluid has very good application prospects and large-scale industrial popularization potential in the field of water-guided laser cutting.