33results about How to "Achieve modification" patented technology

The utility model discloses a chemical mechanical polishing and planarization system, which at least comprises a polishing head. A plurality of air holes are formed in the lower surface of the hard disc, and a third air cavity communicated with the air holes is formed in the hard disc; at least part of the elastic unit is of an annular structure, the elastic unit is connected with the polishing head body and the hard disc, and a second air cavity is defined by the polishing head body, the elastic unit and the hard disc; a retaining ring; when the third air cavity is in a negative pressure state, the lower surface of the hard disc can make contact with and adsorb the wafer substrate, and the pressure in the second air cavity is controllable, so that the elastic unit is driven to flexibly move, the hard disc and the wafer substrate are assisted to float, and chemical mechanical polishing of the wafer substrate is achieved. The hard drive in the hard disc solves the problem that when the flexible film drives the wafer substrate to polish, the flexible film is pulled to cause fracture or elastic modulus change under the severe polishing condition, and the service life of the flexible piece is prolonged.

The invention discloses a polyester fiber for antibacterial wiping and wiping cloth prepared from the polyester fiber, and relates to the technical field of polyester fibers. The antibacterial polyester fiber for wiping is prepared from the following components in parts by weight: 10 to 20 parts of antibacterial PET (Polyethylene Terephthalate) master batch and 100 parts of PET slices, wherein the antibacterial PET master batch is prepared from the following components in parts by weight: 1 to 1.5 parts of an antibacterial component I, 23.25 parts of PET slices and 0.25 to 0.75 part of a compatilizer. The wiping cloth is prepared by spinning antibacterial wiping polyester fibers into a required product specification, then carrying out plasma modification treatment, spraying an antibacterial spraying liquid, and drying. Wherein the antibacterial spraying liquid comprises the following components in percentage by mass: 3-5% of an antibacterial component II, 3-5% of silver nitrate, 1-2% of a silane coupling agent and the balance of deionized water.

The utility model provides a turning and spraying synchronous forming cutter bar, and relates to the technical field of turning and thermal spraying. The turning and spraying synchronous forming cutter bar comprises a turning tool assembly, a powder spraying assembly and a powder supply assembly. The turning tool assembly comprises a turning tool blade and a turning tool bar. The turning tool bar is provided with a first end capable of installing the turning tool blade and a second end far away from the turning tool blade. The powder spraying assembly comprises a spraying head arranged at the first end in a swinging mode, a rotating gear arranged on the turning tool bar in a rotating mode and a rotary knob. The spray head is provided with a spherical gear part used for being meshed with the rotating gear. The knob is connected to the rotating gear and used for driving the rotating gear to rotate so as to drive the nozzle to swing. The powder supply assembly comprises a main box body connected to the spray head through a pipeline, a powder conveying pipeline connected to the interior of the main box body and used for bearing powder, a heater connected to the powder conveying pipeline and a powder feeding barrel connected to the main box body and used for supplying powder to the powder conveying pipeline.

The invention relates to the technical field of conductive ink and sensor production, in particular to a flexible pressure sensor, conductive ink and a preparation method thereof.The preparation method comprises the steps that S1, a modified polyester resin composition is prepared; s2, quaternary ammonium salt modified nanocellulose and a conductive filler are adopted as raw materials to prepare a modified conductive filler; s3, respectively weighing the modified polyester resin composition, the modified conductive filler, a solvent and an auxiliary agent in proportion, adding the materials into a reaction kettle, dispersing, and stirring at a high speed to obtain conductive ink coarse slurry; s4, grinding the conductive ink coarse slurry, adjusting the distance between roll shafts to enable the fineness of the slurry not to exceed 20 microns, filtering and discharging to obtain conductive ink powder; s5, the viscosity is adjusted to be in the range of 5000 cps to 12000 cps, and the conductive ink is obtained. Through the synergistic effect of the components in the conductive ink, the flexible pressure sensor made of the conductive ink has high sensitivity and a wide enough force response range.

The invention belongs to the field of lithium ion batteries, relates to a lithium ion battery electrode material, and particularly provides an MXene surface group modification method based on a NaOH / NaI molten salt system, which is used for realizing accurate regulation and control of MXene surface groups and modification of pure O groups and OH groups on the premise of not damaging an MXene structure. A NaOH / NaI molten salt system is adopted to modify an MXene surface group, an F group is replaced by an OH group to obtain OH group modified MXene, the OH group is further converted into an O group through high temperature, and pure O group modified MXene is obtained; moreover, the method is generally suitable for various MXenes, including single / double-metal MXenes, 21-phase MXenes, 32-phase MXenes, 43-phase MXenes and MXenes synthesized by other different methods; in addition, the method has the advantages of simple preparation process, low temperature, low cost and the like, and can be effectively applied to the fields of lithium ion batteries, supercapacitors and the like.

The invention provides a surface modification method of inorganic fibers. The method comprises the following steps: (1) pre-softening organic matters on the surfaces of the inorganic fibers; (2) placing the pre-softened inorganic fibers in a prepared surface treatment solution for reaction under mechanical conditions so as to perform surface modification on the inorganic fibers; the surface treatment liquid comprises a penetrant, a cosolvent, other functional aids, a pH regulator and water. According to the inorganic fiber surface modification method provided by the invention, the inorganic fiber surface coating layer can be effectively subjected to surface modification and modification treatment on the basis of hardly damaging the performance of the inorganic fiber.

The utility model discloses an injection molding product surface functionalization modification treatment device which comprises a bottom plate, the middle end of the top of the bottom plate is fixedly connected with a frame, the upper end of the outer side of the frame is fixedly connected with a bag-type dust collector, and the bottom of the outer side of the bag-type dust collector is fixedly provided with a dust collector through bolts. The air inlet end of the dust collector communicates with one side of a bag-type dust collector through a pipeline, and the top of the bag-type dust collector is fixedly connected with a second dust collection plate through a pipeline. According to the utility model, the bag-type dust collector is matched with the dust collector, and the second dust collection plate, the second dust collection cover, the first dust collection plate and the first dust collection cover are arranged, so that dust and chippings generated in the surface modification treatment process of injection molding products, such as polishing, can be effectively sucked away in time. The cleaning of the working environment can be kept, the risk that operators inhale dust is reduced, the body health of the operators is protected, the pollution of dust to the treatment device and injection molding products can be avoided, and the treatment quality is improved.

This invention provides a biocompatible β This invention relates to a method for composite modification of titanium alloy surfaces, belonging to the technical field of alloy modification methods. The invention includes applications in medical... β This invention involves introducing bioactive particles onto the surface of a titanium alloy substrate, performing friction stir processing (FSP) on the substrate to introduce bioactive particles and construct a gradient grain structure, and then subjecting the FSP-treated substrate to compressed plasma flow (CPF) treatment to achieve uniform distribution of bioactive particles and construct a topology with an average surface roughness of 3-6 μm suitable for cell growth. The invention precisely controls the amount of bioactive particles introduced and constructs a gradient grain structure through friction stir processing (FSP); simultaneously, compressed plasma flow (CPF) technology achieves uniform distribution of bioactive particles and an ideal surface roughness of 3-6 μm on the titanium alloy surface. Ultimately, this significantly improves the cell adhesion, proliferation capacity, and osteogenic properties of the material surface, solving the technical problem of low integration efficiency of traditional titanium alloy implants with human bone tissue.

The invention relates to the field of chemical pulping, and discloses a method for synchronously preparing sulfate pulp and phenolated lignin as well as the sulfate pulp and the phenolated lignin thereof. The method for simultaneously preparing sulfate pulp and phenolated lignin comprises the following steps: mixing a wood fiber raw material, water and a cooking reagent, and adding phenol; after cooking, obtaining a mixture of residues and black liquor; collecting residues to obtain sulfate slurry; and collecting the black liquor, and carrying out acid precipitation to obtain a precipitate which is phenolated lignin. The phenolic hydroxyl group content of the prepared phenolated lignin is 3.5-6.0 mmol / g, the kappa number of the prepared sulfate pulp is 23.0-110.0, the viscosity of the prepared sulfate pulp is 900-1350 mL / g, and the whiteness of the prepared sulfate pulp is 12.0-30.0% ISO (International Standardization Organization). The method disclosed by the invention has a remarkable lignin modification effect during fiber separation, realizes efficient utilization of resources and reduction of environmental burden, and also has relatively high industrialization potential.

The invention relates to the technical field of adhesives, and discloses a preparation method and processing device of a fast-curing epoxy resin adhesive. The invention first uses isobornyl methacrylate, pentaerythritol tetrakis (3-mercaptopropionic acid) ester, triethylamine and chloroform as raw materials to prepare modified pentaerythritol tetrakis (3-mercaptopropionic acid) ester; then mixes a silane coupling agent and an epoxy resin to obtain an epoxy resin modified by a silane coupling agent; then mixes and stirs the epoxy resin modified by a silane coupling agent, N,N-dimethylformamide, modified pentaerythritol tetrakis (3-mercaptopropionic acid) ester, 2-methylimidazole and nano-silicon dioxide to obtain a fast-curing epoxy resin adhesive. Pentaerythritol tetrakis (3-mercaptopropionic acid) ester is modified by isobornyl methacrylate, so that the adhesive has the effect of fast curing; the epoxy resin modified by a silane coupling agent can enhance the viscosity of the adhesive.

The present invention belongs to the technical field of material preparation, and specifically discloses a left-handed circularly polarized luminescent composite photonic film and its preparation method and application. The left-handed circularly polarized luminescent composite photonic film of the present invention is prepared by first spirally co-assembling methacrylated hydroxypropyl cellulose (HPC‑MA) and a luminophore in the dark, and then drying after ultraviolet light cross-linking polymerization under a photoinitiator. The preparation method of the composite photonic film of the present invention is as follows: HPC‑MA, a luminophore and a photoinitiator are uniformly dispersed in an organic solvent to obtain a precursor liquid with a certain HPC‑MA content, and the precursor liquid is uniformly formed into a film by spin coating, first self-assembled in the dark to form a chiral nematic structure, and then ultraviolet light cross-linking polymerization is performed, and then dried to obtain. The composite photonic film prepared by the present invention exhibits bright full-color structural color, humidity-responsive structural color variation and adjustable multi-color left-handed circularly polarized light emission.

The invention discloses a silicon carbide surface modified ohmic contact structure, a silicon carbide semiconductor device and a preparation method thereof, and belongs to the technical field of silicon carbide semiconductors. The ohmic contact structure comprises a modified silicon carbide bottom layer and a deposited metal surface layer which are directly connected, and carbon vacancies exist in the modified silicon carbide bottom layer. The preparation method comprises the following steps: depositing a nickel film on silicon carbide, and heating the surface of the silicon carbide to generate a nickel-silicon compound layer; removing the nickel-silicon compound layer and the carbon cluster to obtain modified silicon carbide; and depositing conductive metal on the modified silicon carbide. According to the method, first ohmic contact is formed through high-temperature annealing, then the nickel-silicon compound is completely corroded, corroded silicon carbide is removed, and a new clean surface is obtained. Carbon clusters are formed on the surface in the high-temperature annealing process and can be removed through an oxidation method. And then second ohmic contact is formed on the surface of the silicon carbide through low-temperature annealing, so that the gate oxide layer and the ohmic contact have good performance.

The application relates to the technical field of ceramics, and discloses a high-gloss high-whiteness ceramic glaze and a preparation method thereof.The high-gloss high-whiteness ceramic glaze comprises, in terms of weight fractions, 35-40 parts of calcite, 38-45 parts of wollastonite, 0.6-1.4 parts of potassium feldspar, 0.3-0.8 parts of calcined kaolin, 0.6-1.3 parts of clay, 1.2-2.8 parts of calcined zinc oxide, 4-16 parts of high-dispersibility zirconium silicate powder and the like; the phytic acid-based polyethylene glycol contains hydroxyl groups and a large number of sodium phosphate groups, can improve the interaction between polyethylene glycol molecular chains and the surface of zirconium silicate powder, effectively realizes surface modification and modification of the zirconium silicate powder, is favorable for overcoming the agglomeration of the zirconium silicate, and can be uniformly dispersed in a ceramic glaze matrix, and the gloss and whiteness of the glaze surface of the glaze are remarkably improved.

The application relates to the technical field of building construction, and particularly discloses a shotcrete and a construction method thereof. A mixture of the shotcrete comprises the following components: Portland cement, fine aggregate, coarse aggregate, a quick-setting agent, steel fibers and premix, the premix is obtained by mixing diatomite, cyclodextrin, polycarboxylate superplasticizer and modified bentonite and then grinding and sieving, the modified bentonite is obtained by drying a mixture of bentonite and a modified liquid to a constant weight, the components of the modified liquid include polyethylene glycol and water, and the total amount of the polyethylene glycol in the modified liquid is 70-90% of the weight of the bentonite. The modified bentonite is prepared through adsorption between polyethylene glycol and bentonite, adsorption of the bentonite to the polycarboxylate superplasticizer is reduced, the total amount of the polycarboxylate superplasticizer actually playing a water-reducing role in the concrete mixture is increased, the fluidity of the concrete mixture is improved, and the construction performance of the shotcrete mixture is improved.

The invention relates to the technical field of organic silicon foaming materials, in particular to an anti-aging organic silicon foaming material which comprises a component A and a component B, the component A is prepared from the following raw materials in parts by weight: 8 to 12 parts of low-viscosity vinyl silicone oil, 65 to 75 parts of high-viscosity vinyl silicone oil, 15 to 25 parts of hydroxyl silicone oil, 0.8 to 1.2 parts of filler, 0.08 to 0.15 part of platinum catalyst and 15 to 25 parts of polyether sulfone solution; the polyarylether sulfone solution is obtained by adding DMF (Dimethyl Formamide) into polyarylether sulfone until the polyarylether sulfone is just completely dissolved, and the molecular structure of the polyarylether sulfone contains double bonds; the component B is prepared from the following raw materials in parts by weight: 8 to 12 parts of low-viscosity vinyl silicone oil, 85 to 95 parts of high-viscosity vinyl silicone oil, 85 to 95 parts of hydrogen-containing silicone oil and 2 to 4 parts of filler; the method has the advantage of improving the aging resistance of the organic silicon foaming material.

The present invention provides a cooling function roll paper for cigarette filter and its preparation method and application. The preparation method of the cooling function roll paper for cigarette filter of the present invention comprises: S1: mixing phase change material, solvent and surfactant and stirring to obtain a mixed solution; S2: loading the mixed solution on the surface of the roll paper, drying, and obtaining the cooling function roll paper for cigarette filter; wherein the mass content of the phase change material in the mixed solution is 3-20%, and the mass content of the surfactant is 0-5%. The present invention realizes the modification of the roll paper by phase change material through a simple process, reduces the smoke temperature at the cigarette filter part, and improves the smoking comfort of consumers.

The invention belongs to the field of nutritional food preparation, and particularly relates to a helicobacter pylori-resistant composite nutritional composition and a preparation method thereof. The composite nutritional composition contains the functional plant protein hydrogel, the probiotic preparation and the like, the functional plant protein hydrogel has the effects of various plant-derived active substances at the same time, and the probiotic preparation is used for encapsulating the lactobacillus rhamnosus D8A, so that the survival rate of the lactobacillus rhamnosus D8A in gastrointestinal tracts is increased. The functional vegetable protein hydrogel and the probiotic preparation can synergistically improve the intestinal flora disorder condition. After egg yolk globulin powder, maltodextrin and Arabic gum are mixed, a coating material is prepared and covers the outside of a pressed tablet, and finally, the composite nutritional composition obtained by air drying is safe, non-toxic and edible through an acute oral toxicity test and a 30-day feeding test, and meanwhile, the composite nutritional composition is beneficial to regulating intestinal flora and improving the immunity of a human body. The field planting of stomach helicobacter pylori can be inhibited, and the application range is wide.

The invention belongs to the field of roads, and particularly relates to a road epoxy asphalt toughening additive and a preparation method thereof.The preparation method comprises the steps that calcium carbonate whiskers are prepared from calcium 2-methoxyethanol and ammonium bicarbonate and subjected to hydrophobic modification, and modified calcium carbonate is obtained; the preparation method comprises the following steps: carrying out surface coating on calcium sulfate, then mixing the coated calcium sulfate with modified calcium carbonate, putting the mixture into an ethanol dispersion liquid of ammonium carbonate, and fully dispersing to obtain the road epoxy asphalt toughening additive. The road epoxy asphalt toughening additive disclosed by the invention can be used for directionally filling pores of a road system and bridging and repairing cracks in a subsequent road use process, so that an internal structure is more compact, continuous toughening is realized, the durability of a road is improved, and the service life of the road is prolonged.

The invention provides a solid electrolyte material and a preparation method thereof, and relates to the technical field of lithium ion batteries. The preparation method of the solid electrolyte material comprises the following steps: S1, mixing and shearing a biodegradable material, polyethylene glycol and an ethylene-methyl acrylate copolymer to obtain a mixed material; and S2, uniformly mixing the first part of mixed material with a lithium salt, adding the second part of mixed material, mixing, and shearing to obtain the solid electrolyte material. The solid electrolyte material prepared by the invention has the advantages of biodegradability, high ionic conductivity and high mechanical strength.

The invention discloses a CrMnTi gear steel with good low-temperature toughness and a production method thereof, belonging to the field of gear steel bar steel. The gear steel comprises: C: 0.18%-0.22%, Si: 0.20%-0.30%, Mn: 0.90%-1.10%, Cr: 1.00%-1.20%, Mo: 0.10%-0.20%, Ti: 0.040%-0.065%, W: 0.05%-0.15%; Ni: 0.05%-0.10%; Al: 0.020%-0.040%, B: 0.0020%-0.0040%, N: 0.010%-0.016%, Mg: 0.0035%-0.0065%, Ca: 0.0040%-0.0080%; the balance is Fe and unavoidable impurities. The gear steel of the invention can have good toughness at low temperatures.

The preparation method comprises the following steps: taking an expanded graphite accumulation body as an anode and a metal conductive material as a cathode, inserting the expanded graphite accumulation body and the metal conductive material into an electrolyte containing a modifier, carrying out electrochemical stripping, carrying out suction filtration, washing and centrifugal treatment on the reacted electrolyte, and taking a supernatant to obtain a graphene oxide dispersion liquid; and fully mixing the modified graphene dispersion liquid with a water-based resin emulsion and a curing agent to obtain the graphene oxide water-based anticorrosive coating. According to the preparation method provided by the invention, deep oxidation and modification of the expanded graphite accumulation body are realized in one step by virtue of electrochemical treatment, and the graphene oxide has certain hydrophilicity, so that the hydrophilicity is further enhanced after amino modification, and the dispersity in a polar solvent is remarkably improved. The amino-modified graphene oxide can be more uniformly dispersed in the application field of coatings, so that the graphene oxide and a matrix material are better combined, and the overall performance of a composite material is improved.

The application discloses a kind of nanometer silicon-based powder material surface modification material and preparation method and application, structure includes from inside to outside nanometer silicon, first silicon oxide layer, second silicon oxide layer, carbon coating layer or oxide coating layer, wherein the size of nanometer silicon is 30-200nm;Wherein the thickness of first silicon oxide layer is 2-4nm, oxygen content is 2-6wt%;Wherein the thickness of second silicon oxide layer is 1-3nm, oxygen content is 1-4wt%;Wherein the carbon content in carbon coating layer is 1-5wt%, the content of oxide in oxide coating layer is 0.1-1wt%.The application utilizes the diffusion and flow characteristics of supercritical carbon dioxide, modifies nanometer silicon-based material, can control superfine powder material surface structure by this modification method, and can realize nanometer silicon-based material surface uniform coating, improve the utilization ability of nanometer silicon-based material.

The invention relates to the technical field of waste incineration treatment, in particular to a purification and modification system based on heavy metal chlorine salt in waste incineration fly ash, which comprises a hopper, a grate furnace, an evaporator, a superheater, a coal economizer, a deacidification tower, a lime powder tank, a bag-type dust collector and a chimney which are sequentially arranged along a flue gas flowing direction, the bag-type dust collector is further connected with a water washing tower, the water washing tower is respectively connected with a first collecting bin and a second collecting bin, the first collecting bin and the second collecting bin are respectively connected with a modifying machine, the first collecting bin is used for collecting precipitates obtained after purification of heavy metal chlorine salt, and the second collecting bin is used for collecting fly ash obtained after water washing. And the modifying machine is used for mixing and grinding the precipitate and the washed fly ash so as to modify the washed fly ash, and spraying the modified fly ash back into the flue. According to the technical scheme, resource utilization of the heavy metal chlorine salt can be effectively achieved.

The utility model discloses a modifying and homogenizing device suitable for high-hardness powder. The modifying and homogenizing device comprises a cylinder main body (1), a front end cover (2), a rear end cover, a stirrer (3), a feeding hole (4) and a dust removal bag (5), the cylinder main body is horizontally arranged, and a horizontally arranged stirrer is arranged in the cylinder main body; aluminum oxide ceramic chips are attached to the inner walls of the cylinder body, the front end cover and the rear end cover. When the equipment runs, powder is fed from a feed port, an auxiliary agent enters from an auxiliary agent liquid inlet pipe (7), and a gas inlet pipe (6) can be used for filling high-temperature compressed gas into a cylinder main body to accelerate mixing and homogenization; a second one-way valve (8) is installed on the auxiliary liquid inlet pipe, and a first one-way valve (9) is installed on the gas inlet pipe. The aluminum oxide ceramic chips are attached to the inner walls of the cylinder main body, the front end cover and the rear end cover, so that the problem that high-hardness powder abrades the inner wall of the cylinder main body is solved; and an auxiliary liquid inlet pipe and a gas inlet pipe are arranged on the front end cover and the rear end cover, so that powder modification and homogenization are accelerated.

The invention provides a preparation method of a hollow nitrogen-doped carbon nano square block material with co-existing cobalt monatomic and cobalt selenium nano particle sites. The method comprises the following steps: (1) synthesizing a metal organic framework precursor; (2) etching the metal organic framework material; and (3) carrying out temperature programming vapor deposition. Co single atoms and cobalt selenium nanoparticle sites are jointly loaded on the nitrogen-doped carbon nano substrate, the activity of the material for catalyzing the oxygen evolution reaction is greatly improved, the preparation process is simple, the cost of the needed raw materials is low, and the method is suitable for industrial production. A new design thought and a synthesis path are provided for preparing the transition metal selenide and a nano catalytic material with coexistence of monatomic and nano particles.

The invention discloses a CrMnTi gear steel and a production method thereof, belonging to the field of gear steel bar steel. The gear steel comprises: C: 0.18%-0.22%, Si: 0.20%-0.30%, Mn: 0.90%-1.10%, S: 0.010%-0.020%, Cr: 1.00%-1.20%, Mo: 0.10%-0.20%, Ti: 0.040%-0.065%, Al: 0.020%-0.040%, B: 0.0020%-0.0040%, N: 0.010%-0.016%, Mg: 0.0035%-0.0065%, Ca: 0.0040%-0.0080%, and the balance is Fe and unavoidable impurities. The gear steel of the invention has good machinability.

The invention discloses a preparation method of nano-silver particles for electronic 3D printing conductive ink, which comprises the following steps: carrying out surface ligand exchange by using diethanol amine, and carrying out surface modification on the nano-silver particles protected by a dispersing agent; the particle size of the nano-silver particles prepared through the method ranges from 20 nm to 80 nm, the particle size distribution of the particles is uniform, and the morphology of the nano-silver particles is similar to a sphere. The diethanol amine and the dispersing agent attached to the surfaces of the nano-silver particles are adopted for surface ligand exchange, the dispersing agent is effectively removed, the nano-silver particles with the sphere-like morphology are obtained, the subsequent complex washing procedure is not needed, the conductivity of the nano-silver particles is effectively guaranteed, the reaction is mild, operation is easy, and the preparation method is suitable for industrial production. The method is suitable for the field of electronic 3D printing conductive ink.

The invention provides a preparation process and application of novel phosphatidylated carnosic acid, and the preparation process comprises the following steps: mixing 3-5 parts by mass of soybean phospholipid and 1-3 parts by mass of modified soybean phospholipid, melting at low temperature, adding 5-10 parts by mass of carnosic acid, mixing, and curing at low temperature to obtain the novel phosphatidylated carnosic acid. The preparation method of the modified soybean phospholipid comprises the following steps: (1) adding organic acid into soybean concentrated phospholipid serving as a raw material, and uniformly stirring for later use; and (2) continuously adding the material prepared in the step (1) into an absorption tower, intermittently or continuously blowing ozone into the absorption tower at the same time, enabling the material to be in contact with the ozone to carry out oxidation reaction, discharging the material from the absorption tower, and drying at the vacuum degree of 0.095-0.1 Mpa to prepare the modified soybean phospholipid. After the carnosic acid is phosphatized, the stability can be improved, and the bioavailability of the carnosic acid can be enhanced. The application of the compound in the fields of food, food additives, animals, pets, cosmetics or other antioxidation and the like is expanded.

The invention relates to a furan polyester material for 3D printing. The furan polyester material is prepared from the following raw materials: furandicarboxylic acid, butanediol, polyethylene furandicarboxylate and an antioxidant. According to the invention, polymerization reaction and blending extrusion are continuously carried out, the operations of early-stage granulation, drying and remelting are reduced, the process is simplified, the prepared furan polyester material has high mechanical strength and glass transition temperature, and the prepared 3D printing product has the advantages of good formability, low shrinkage rate and convenient processing.

The invention belongs to the photovoltaic field, and particularly relates to an organic-inorganic perovskite thin film, a perovskite / crystalline silicon laminated solar cell and a preparation method. The preparation method of the organic-inorganic perovskite thin film comprises the following steps: (1) taking cesium bromide, lead iodide and rubidium halide as inorganic evaporation sources for evaporation to obtain an inorganic framework; and (2) coating the surface of the inorganic frame with an organic solution, and then annealing to obtain the organic-inorganic perovskite thin film. According to the preparation method, the quality of the organic-inorganic perovskite thin film is improved, and then the open-circuit voltage, the filling factor, the photoelectric conversion efficiency and the stability of the perovskite / crystalline silicon laminated solar cell are improved.