66results about How to "The process is simple and controllable" patented technology

The invention relates to a preparation method of echinoid titanium dioxide microspheres in single/double layer cavity structure, belonging to the field of nano composite materials. The method comprises the following steps: (1) preparing monodisperse silicon dioxide microspheres with uniform particle size; (2) by using silicon dioxide as a template, coating a titanium dioxide layer on the surface of the silicon dioxide microspheres by using a sol-gel method to obtain core-shell type silicon dioxide/titanium dioxide composite microspheres; (3) regulating the concentration of sodium hydroxide solution, the hydrothermal reaction time and other conditions, and preparing echinoid titanium-base microspheres in the single/double layer cavity structure in a controllable way; and (4) treating the echinoid titanium-base microspheres in the single/double layer cavity structure with hydrochloric acid with a certain concentration, and calcining at high temperature to obtain anatase-type echinoid titanium dioxide microspheres in the single/double layer cavity structure. The material prepared by the method has the high-activity pure-phase titanium dioxide crystal structure, and has the advantages of large specific area, complete appearance and high yield; the technical process is controllable and easy to operate; and the invention also has the advantages of low preparation cost, no pollution and low energy consumption.

The invention discloses a lightweight inorganic insulation board containing silica aerogel and a preparation method thereof. The preparation method comprises the following steps: a. preparing surfactant liquid: fully stirring a surfactant and water to prepare a uniform surfactant liquid for standby use; b. preparing powder: fully mixing cement, ash calcium, aerogel, light aggregate fillers, fibers and latex powder and stirring uniformly to prepare powder for standby use; c. preparing the inorganic insulation board: adding the uniformly mixed powder to the surfactant liquid within 5-10 minutes through stirring, then filling the slurry into a die for forming and curing at normal temperature, thus obtaining the final product. Compared with the traditional inorganic insulation boards and insulation boards containing non-silica aerogel, the prepared inorganic insulation board containing silica aerogel has the characteristics of short production cycle, simple and controllable process and low price, has good heat insulation property and effectively solves the problems of high heat conductivity coefficients and higher water absorption of conventional inorganic insulation boards, and the heat conductivity coefficient of the inorganic insulation board can be reduced by 10-30%.

The invention relates to a novel preparing process of a material used for a silver zinc oxide contact. The invention has a process that a material prepared by silver, zinc and additives according to a certain proportion is put into an intermediate frequency smelter for melting; a high pressure water atomizing device is adopted for high pressure alloy atomization; atomized alloy powder is dried and oxidated for modification; an equal static ingot is formed after equal static treatment; the ingot is agglomerated in a heating furnace; the agglomerated ingot is delivered into an extruding machine to extrude plates or wires; the extruded plate is rolled and punched for shaping after surface treatment and silver restoring; the extruded wire is pulled and annealed to get a finished wire which is used for making rivets or different shape materials. The silver zinc oxide contact material prepared by the process has uniform metallographic structure, high density and good machining performance.

The invention provides a self-cleaning hydrophilic composite material and a preparation method thereof, wherein the self-cleaning hydrophilic composite material comprises a transparent substrate and a composite film positioned on the transparent substrate surface; the composite film comprises hollow microspheres with cavities therein, a spherical shell material of the hollow microspheres is a composite particle; the composite particle is a core-shell coating structure, a core material is SiO2 nano particle, a shell material is TiO2, the particle size of the shell material TiO2 is less than that of the core material SiO2. By improving a film structure on the basis of a microscopic structure, the self-cleaning hydrophilic composite material simultaneously has ultra-hydrophilic antifogging, anti-microbial and dustproof effects, and the time of the ultra-hydrophilic effectiveness is prolonged.

The invention discloses a production method of an imitative natural stone texture porcelain tile. By adjusting the caliber size and the shape of a slurry outlet of a distributing pipeline, and the arrangement position and swinging of the pipeline, different colors of slurry is sprayed onto the surface of a green brick under certain pressure to form different color gradients which are similar to patterns and lines formed by flowing, impact and extrusion of lava, the texture is natural and smooth, the effect is lifelike, the decorative effect is comparable to the decorative effect of natural stone, the working procedure is easy to control, and the mass production is stable. Meanwhile, by adopting the method provided by the invention, the slurry is easily recycled, and the overall production cost is effectively controlled.

The invention provides a method for recycling waste mortar for cutting silicon wafers, comprising the following steps: a. solid-liquid separation of waste mortar for cutting silicon wafers to obtain solid sand and liquid parts; b. adding decolorization to the liquid parts obtained in step a agent, ion adsorbent and filter aid, and solid-liquid separation to obtain polyethylene glycol cutting recovery liquid; c. the solid sand material obtained in step a is separated and removed by magnetic separation to obtain a mixture of silicon and silicon carbide; d. Heat the mixture of silicon and silicon carbide obtained in step c under vacuum at 1425-1550°C; cool to room temperature and filter through a sieve, collect the material under the sieve to obtain silicon carbide micropowder, collect the material on the sieve to obtain silicon block; pulverize silicon block to obtain silica fume. The recovery method provided by the invention is very environment-friendly, and the separation of silicon and silicon carbide is more thorough, and the recovered polyethylene glycol, silicon carbide and silicon powder have higher purity.

The invention discloses a recycling process of a sintering neodymium iron boron discard black wafer. The recycling process comprises the following steps of pretreatment of waste material, multi-stage crushing, hydrogen decrepition, powder preparation by jet milling, blending of main alloy and auxiliary alloy, forming of a magnetic field, and sintering, so as to prepare a neodymium iron boron magnet which has satisfactory requirement; the auxiliary alloy is an alloy fine powder containing one or multiple of praseodymium neodymium, holmium iron, gadolinium iron and dysprosium iron, and the percentage of auxiliary alloy is 1% to 50%. The recycling process has the advantages that the utilizing rate of waste material of the black wafer is high, the flow process is simple and controllable, the operability is strong, and the manufacturing cost is saved; strong acid and strong alkaline with higher pollution property are not contained, the environment-friendly effect is realized, and the economic and social benefits are higher.

The invention provides a preparation method of an anode active material, which comprises the steps of: a, adding a titanium source and an organic carbon source in an organic solution with the pH value of 0-6 to prepare a mixture solution; b, adding an oxidizing agent in the mixture solution, reacting for 1-24h at a temperature of 20-80 DEG C, then separating and settling, washing with water, drying to obtain a titanium-containing precursor; and c, carrying out mixing and ball-milling on the titanium-containing precursor obtained in the step b and a lithium source, and then roasting in an inert gas. A lithium titanate composite material prepared by adopting the method disclosed by the invention has less impurity phases; the prepared nanometer lithium titanate particles are attractive in appearance; and the preparation method has the advantages of short time, low energy consumption, low cost, high yield, uniform particles of the prepared material, stable performance of the prepared material, simple and controllable process, and capability of realizing massive industrialized clean production.

The invention provides a preparation method of a LiMnxFe1-xPO4 positive electrode active material. The method comprises the following steps that a soluble trivalent manganese salt solution, a soluble ferric iron salt solution and a soluble phosphate radical-containing substance solution are blended to form a mixed solution, the mixed solution undergoes a reaction to produce a MnxFe1-xPO4.2H2O precursor, and LiMnxFe1-xPO4 is prepared from the MnxFe1-xPO4.2H2O precursor. The invention also provides the LiMnxFe1-xPO4 positive electrode active material obtained by the preparation method. The LiMnxFe1-xPO4 positive electrode active material has the advantages of uniform particle size distribution, perfect morphology, no agglomeration, small particle size and material electroconductivity improvement. A cell prepared from the LiMnxFe1-xPO4 positive electrode active material has excellent rate discharge performance, especially has high-rate discharge performance, has a high cell charging-discharging capacity, stable cell charging-discharging performances and good cycle performances, lays the foundation in excellent positive electrode active material development and is conducive to material application and cell development.

The invention provides a preparation method of a hydrophobic polymer film material. The material comprises the following components in parts by weight: 100 parts of a polymer; 0.5-25 parts of micro-nano particles; and 0.5-30 parts of other auxiliary agents. The preparation step comprises: melt-mixing the polymer, the micro-nano particles and the other auxiliary agents, performing extrusion, calendering or tape casting to form a film blank, and then performing stretching; and forming micro-nano protrusions and cavity rough surface structures after stretching to obtain the hydrophobic polymer film material. The water contact angle of the material is 120 degrees or more, and the rolling angle is 15 degrees or less.

The invention discloses a method for large-sized ceramic grinding balls, which belongs to the technical field of grinding media. The method comprises: firstly, preparing monomer solution for gelcasting; secondly, adding ceramic powder into the monomer solution, stirring the solution uniformly to obtain stable slurry, adding a catalyst and an initiator into the slurry, stirring the slurry under vacuum to exhaust air; and finally, pouring the slurry into a mold, keeping the temperature of the slurry till the monomer reacts with a crosslinker completely to obtain a ceramic grinding ball biscuit, and drying and sintering the biscuit to obtain the ceramic grinding ball. The ceramic grinding ball manufactured by the method has high strength, hardness, wear resistance, corrosion resistance and high-temperature stability; meanwhile, the size of the ball can be controlled by the size of the ball mold cavity of the mold; and the method is particularly suitable for forming large-sized ceramic grinding balls, is low in cost and makes industrial production easy.

The invention discloses a polymer multiplayer optical film with a linear trapezoidal thickness structure and a manufacturing method thereof. The polymer multilayer optical film comprises n first optical film layers and m second optical film layers, wherein the first optical film layers are made of a polymer A; the second optical film layers are made of a polymer B; the polymer A and the polymer B have different refractive indexes; the n first optical film layers and the m second optical film layers are laminated alternately layer by layer; the thicknesses of the n first optical film layers increase layer by layer in a linear gradient way along an overlapping direction; the thicknesses of the m second optical film layers increase layer by layer in a linear gradient way along an overlapping direction; the polymer multilayer optical film is obtained by adopting a bidirectional extension technology. By adopting the polymer multilayer optical film with the linear trapezoidal thickness structure, bandwidth reflection can be performed selectively; for example, infrared light of a certain bandwidth is reflected, ultraviolet light is reflected fully, and visible light is reflected fully. The polymer multilayer optical film is simple in manufacturing process, is low in cost, and can be widely applied in the fields of agricultural plastic tents, automobile window films, building window films and liquid crystal display brightening films.

Belonging to the technical field of nanofiber, the invention relates to a TiO2 hollow complete mesoporous nanofiber. The main composition components of the nanofiber are Ti and O, and the main manifestation is TiO2. The nanofiber has a porous structure, and the pores of the porous structure include mesopores, and have both hollow and complete mesoporous structures. The preparation method includes: subjecting a precursor spinning solution to electrospinning to obtain organic precursor nanofiber; and calcining the prepared organic precursor nanofiber to obtain the TiO2 hollow complete mesoporous nanofiber. The TiO2 hollow complete mesoporous nanofiber can also be applied as a photocatalyst to photocatalytic decomposition of water into hydrogen, and has excellent efficiency and stability. According to the invention, an appropriate amount of paraffin oil is added and is coated by a continuous phase under the effect of electrostatic force so as to effectively synthesize TiO2 nanofiber with both hollow and complete mesoporous structure. And the process of the preparation method is simple and controllable.

The invention relates to a WO3/BiVO4/FeOOH ternary system composite material and a preparation method thereof and application in photoelectrocatalysis, and belongs to the field of the photoelectrocatalysis. The WO3/BiVO4/FeOOH ternary system composite material is prepared from monoclinic phase WO3, monocline BiVO4 and amorphous state FeOOH. The WO3 covers the bottom layer, the BiVO4 covers the WO3, the FeOOH wraps the outermost layer, wherein the mass of the BiVO4 is 85-95% of the total mass of the WO3/BiVO4/FeOOH ternary system composite material. The WO3/BiVO4/FeOOH ternary system compositematerial and the preparation method thereof and the application in photoelectrocatalysis have the advantages that WO3/ porous BiVO4 is utilized to construct efficient heterojunction, FeOOH serves as acatalyst promoter, the photoelectrocatalytic performance is improved in multiple aspects, and the WO3/BiVO4/FeOOH ternary system composite material can be effectively applied in photoelectrocatalysisand has high efficiency and stability.

The invention relates to a blue phenolic moulding plastic and a preparation method thereof, the blue phenolic moulding plastic is prepared by sufficiently and evenly mixing organic reinforcing material, thermoplastic phenolic resin, curing agent, lubricating agent, inorganic filler, plasticizing agent and pigment, feeding the mixture into a roller press for plastication, and cooling and crushing the mixture. The phenolic moulding plastic not only has excellent light fastness and heat resistance, good aging resistance, dazzling color and little possibility of decolorization, but is also outstanding in injection molding performance and high in bending strength.

The invention relates to a preparation method of a fibriform metal copper oxide enhanced silver-based electric contact material, which is used for preparing the silver copper oxide electric contact material (wires) by taking silver powder and silver and copper alloy powder as raw materials, adding a small number of tungsten and molybdenum elements as performance adjusting elements, taking the silver oxides as a reactant and adopting the steps of mixing, press forming, solid phase in-situ sintering, extruding and drawing. The invention is characterized in that: (1) the formation of the copper oxide and the fibrosis of the copper oxide are finished at a time in the preparation and machining processes; (2) the fibriform distribution of the copper oxide forms a microstructural characteristic with a certain orientation relation to make the metal oxide rooted in a silver matrix, thereby solving the problem of the metal oxide loss of the traditional particle metal oxide in electrical arc corrosion, improving the electrical arc corrosion resistance of the metal oxide and also broadening the application range of the silver metal oxide electric contact material; and (3) the preparation method has the advantages of short flow, low production cost and easy industrialization.

The invention discloses a method of preparing a high-level oxidation catalyst based on sulfate radial by utilizing solid waste cobalt ore smelting slag as a raw material, and pickling, modifying and activating the raw material. In the catalysts, the silicon dioxide skeleton in the slag is used as a carrier, and such ions or compounds as cobalt and ferrum are fixedly carried on the granule surfaces through pickling and coprecipitation methods, so that the smelting slag has such characteristics as high-level oxidation, multi-metal concerted catalysis and heterogeneous catalysis, and the like, and a non-homogeneous phase catalyst system formed by the smelting slag enables the smelting slag to be easily separated from a water body. When being applied on industrial sewage treatment, the catalytic oxidation system not only has high catalytic oxidation efficiency, wide pH adaptation range, low metal ion loss quantity and easy separation with water body, but also recycles the cobalt ore slag solid waste to change the waste into valuable, thereby both meeting the sustainable development and the nation call of the energy conservation and emission reduction, and having low cost and is easy to generalize, so that the method in the invention has brilliant application prospect.

The invention provides a silver-coated cobalt powder and a preparation method thereof. The preparation method of the silver-coated cobalt powder comprises the following steps of: mixing and heating a cobalt salt solution, a dispersing agent and hydrazine hydrate to form a cobalt ion complex solution; the molar ratio of hydrazine hydrate to cobalt salt being (1.3-1. 5):1; keeping the temperature of the cobalt ion complex solution unchanged, adjusting the pH value of the cobalt ion complex solution to be alkaline, and adding the hydrazine hydrate for reaction to generate an elemental cobalt crystal; and adding a soluble Ag salt and the hydrazine hydrate to undergo a reduction reaction, and carrying out solid-liquid separation and drying to obtain the silver-coated cobalt powder. The silver-coated cobalt powder provided by the invention is prepared by a process that hydrazine hydrate is added step by step. The preparation method of the silver-coated cobalt powder has the advantages of simple working procedure, easiness in control, high production efficiency and low production cost, and is suitable for industrial production. The silver-coated cobalt powder prepared by the method has the advantages of small particle size, stable structure, excellent conductivity and strong thermal conductivity.

The invention relates to a method for separating and purifying iron ions in a sodium aluminate solution. The method is characterized in that: powdery activated alumina as a deironing agent is added into the sodium aluminate solution, stirred, absorbed, filtered and separated to obtain the purified sodium aluminate solution and the alumina as the de-ironing agent which absorbs iron impurities. In the method, the de-ironing material has a stable and reliable source, and the method for preparing the de-ironing agent is simple and feasible and uses industrial products with quite cheap prices. The method for separating and purifying the iron ions in the sodium aluminate solution effectively simplifies the technical flow of the de-ironing process, reduces production cost and is easy to popularize and apply in industry.

The invention belongs to the technical field of waterproof materials, and especially relates to a waterproof voile production technology. The waterproof voile production technology comprises followingsteps: raw material preparation, waterproof solution preparation, and glue solution preparation, wherein the raw material is glass fiber, the waterproof solution comprises 35 parts of water, 5 partsof acrylic acid, 2 to 2.5 parts of 30% sodium hydroxide aqueous solution, 0.1 to 0.15 part of a cross-linking agent, 0.1 to 0.2 part of an initiator, and an auxiliary agent, and the glue solution comprises 150 parts of water, and 10 parts of a polyacrylate emulsion with a solid content of 50%; primary dip padding; drying; secondary dip padding; secondary drying; drafting; and coiling. After drying, a double layer waterproof structure is formed by the waterproof solution and the glue solution, the waterproof voile water absorbing swelling speed and the sealing waterproof performance are improved; a plurality of times of drying treatment and temperature control is capable of realizing reaction of components in the waterproof solution and the glue solution, the physical/chemical performance of the waterproof voile is improved. The whole process is easy to control, no special equipment is needed, and the production cost is relatively low.

The invention relates to a method for preparing nano-sized carbon black by lignin at a large scale. The method is characterized by comprising the following steps: purification, oxidization, pre-reaction, condensation, washing, paste preparation and heat treatment. According to the method disclosed by the invention, water serves as a reaction medium, the technological process is simple and controllable, the particle size of a product can be adjusted and controlled by adjusting a high-temperature carbonization technological parameter in the chemical reaction and the heat treatment, and the method is suitable for large-scale industrial production. Additionally, the average particle size of primary particles of the carbon black prepared by the method disclosed by the invention can be 100nm or lower, and the carbon black can be applied to the fields of reinforcement for rubber, plastic filling, and so on.

The invention relates to a preparation method of a ZnO modified WO3/BiVO4 heterojunction and belongs to the technical field of material preparation. The preparation method of the ZnO modified WO3/BiVO4 heterojunction comprises the following steps: preparing a WO3 seed crystal layer from WCl6 and PVP; dissolving sodium tungstate into water and adding hydrochloric acid and ammonium oxalate sequentially to obtain a transparent solution; adding the transparent solution into the WO3 seed crystal layer, performing reaction to obtain a WO3 array precursor and performing high-temperature annealing toobtain a WO3 electrode; dissolving bi(acetylacetone)vanadium oxide and bismuth nitrate pentahydrate into glacial acetic acid, and adding ethyl cellulose to obtain a BiVO4 precursor solution; dispensing the surface of the WO3 electrode with the BiVO4 precursor solution, drying and annealing to obtain a WO3/BiVO4 composite photo-anode; and placing the WO3/BiVO4 composite photo-anode in an atomic layer deposition system, performing sedimentary cycle on diethyl zinc and water and allowing ZnO to grow layer by layer to obtain the ZnO modified WO3/BiVO4 heterojunction with relatively high efficiencyand stability in photoelectrocatalysis.

The invention discloses a nano-scale cube CoSnO<3> and graphene composite material. The composite material is characterized in that nano-scale cube CoSnO<3> and gauzy graphene form a coating structure. The nano-scale cube CoSnO<3> and graphene composite material is prepared by a simple and easy method, wherein the nano-scale cube CoSnO<3> is uniformly coated with graphene, and by virtue of graphene coating, the conductivity of the CoSnO<3> material is greatly improved; meanwhile, volume expansion of the CoSnO<3> material is also relieved, and pulverization and falling off of the electrode material are also suppressed effectively; and therefore, when the nano-scale cube CoSnO<3> and graphene composite material prepared in the invention is used as the negative electrode material of a sodiumion battery, excellent discharge specific capacity and stable cycle performance are represented.

The invention relates to CsPbBr3 nanocrystal and a method to synthesize CsPbBr3 nanocrystals of different dimensions based on a microwave method and belongs to the technical field of material preparation. The CsPbBr3 nanocrystal has adjustable dimensions including 0 dimension, 1-dimension and two-dimension. The method includes: heating Cs2CO3, oleic acid and octadecene to 100-130 DEG C, holding the temperature in vacuum, and heating until Cs2CO3 is completely dissolved to obtain a Cs precursor; heating PbBr2, 1-octadecene and diethylene glycol monobutyl ether to 100-130 DEG C, holding the temperature in vacuum, injecting the dried oleic acid and oleyl amine in the volume ratio of (1-15):1, heating until PbBr2 is completely dissolved to obtain PbBr2 precursor; mixing the Cs precursor and the PbBr2 precursor under nitrogen protection, synthesizing under microwave, cooling with ice water, centrifugally washing, and re-dispersing in hexane or methylbenzene for preservation. The method enables CsPbBr3 perovskite nanocrystals of different dimensions to be quickly synthesized in a controllable manner.

The invention discloses a preparation method of a composite zirconia ceramic backboard. The method comprises steps as follows: composite zirconia granulation powder is poured into a backboard mold andsubjected to dry-pressing molding, an obtained model is subjected to degreasing, high-temperature roasting and flash burning, and a backboard sintered body can be prepared. The preparation method ofthe composite zirconia ceramic backboard is combined with high-pressed sintering and flash burning technologies, the temperature of the high-temperature roasting of the method is lower than that of the high-pressed sintering technology by 500-700 DEG C, the total time for high-temperature roasting does not exceed two minutes, and the obtained backboard sintered body not only has mechanical properties equivalent to those of a product obtained with the high-pressed sintering technology, but also has the characteristics of being compact in structure and free of microscopic hole defects; besides,the method further has the advantages of simple and controllable process, efficient preparation and relative energy conservation, and is suitable for industrial production.

The invention relates to a TPU protective film, and a TPU base film and a preparation method thereof. The method comprises the following steps: preparing the TPU base film with high Shore hardness by adopting wet precision coating; then coating one surface of the TPU base film with hardening liquid; and coating the other surface of the TPU base film with high-viscosity silica gel glue, thereby obtaining the hardened TPU protective film having a surface hardening layer and capable of being attached to an AF screen through three procedures. The TPU protective film structurally comprises: a bottom film layer; a use layer, which is arranged on the bottom film layer and comprises the hardened layer, the TPU base film and an adhesive layer; and a mask layer, which is arranged on the hardened surface of the use layer. The hardened TPU protective film provided by the invention has good oil stain resistance, fingerprint resistance, smoothness, wear resistance and fitting performance, and is suitable for a protective film product of a curved screen.

The invention relates to ceramic with a mullite structure as well as a preparation method and application thereof. The ceramic has a crystalline-state A14B209 phase and amorphous silicon dioxide, wherein amorphous silicon dioxide accounts for 18% or more of total mass of the ceramic; density of the ceramic is smaller than 2.8g/cm<3>; after ceramic is prepared into filaments, monofilament tensile strength is 1.2-1.8 GPa, and elastic modulus is 140-180 GPa. The preparation process is a classical single-phase mullite sol-gel method, and is used for preparing a product with low density, high toughness and high strength by optimizing types and dosage of components. The preparation method disclosed by the invention has the advantages of being wide in raw material source, low in cost, simple andcontrollable in preparation process, short in time consumption, relatively low in requirement on production environment and equipment, good in product repeatability, liable to recycle a solvent, suitable for industrial production and the like. A product designed and prepared by the preparation method can be applied to the fields such as thermal insulation, national defense and military industry, aerospace, and environmental protection of chemical industry.

The invention discloses heteroatom doped carbon aerogel and a preparation method thereof. The method comprises the following steps: directly and evenly grinding zinc salt containing crystal water and an organic ligand containing heteroatom in a mortar, and then performing carbonization treatment on a mixed material to obtain the heteroatom doped carbon aerogel. The method disclosed by the invention achieves ultrathin-wall heteroatom doped carbon aerogel synthesis through a one-step method, and has the advantages of simple and controllable technology, short preparation period, low cost and high heteroatom doping efficiency. The heteroatom doped carbon aerogel disclosed by the invention has a three-dimensional porous structure and an ultrathin-wall structure, a specific surface area of the heteroatom doped carbon aerogel is 1028.7 to 1921.4m<2>g<-1>m<2>g<-1>, an average pore size is 0.9 to 1nm, and a wall thickness is 3 to 5nm; the heteroatom doped carbon aerogel has the advantages of ultrathin wall, large specific surface area, high porosity, multiple active sites, high atom utilization rate, large contact area with electrolyte and the like; the heteroatom doped carbon aerogel can enable a material to have good electric conductivity and high chemical reaction reactivity.

A process method for adding an ILD (Inter Layer Deposition) filling window of an adjustable control gate poly comprises the steps of providing a substrate with a cell memory region and a peripheral region; depositing a first poly gate layer on a surface of the substrate; growing a silicon oxide blocking layer on a surface of the first poly gate layer; performing photoresist coating and developing on a surface of the silicon oxide blocking layer to expose the peripheral region, and only etching to remove the silicon oxide blocking layer on the peripheral region; depositing second poly gate layers on surfaces of the silicon oxide blocking layer of the cell memory region and the first poly gate layer of the peripheral region; performing photoresist coating and developing on a surface of the second poly gate layers to expose the cell memory region, and etching to only remove the second poly gate layer on the cell memory region; etching to remove the remaining silicon oxide blocking layer; and performing photoresist coating and developing on surfaces of poly gates of the cell memory region and the peripheral region, and forming a final dual-poly gate structure by dry etching.

The invention relates to a synthetic fiber capable of removing formaldehyde and a preparing method thereof, and belongs to the technical field of functionality synthetic fibers. The synthetic fiber is prepared from, by weight, 70 parts to 80 parts of polyacrylonitrile, 60 parts to 70 parts of polybutylene terephthalate, 60 parts to 70 parts of rod-type zinc oxide, 1 part to 5 parts of active carbon nanoparticles, 1 part to 5 parts of non-ionic surfactants and 80 parts to 86 parts of ethyl alcohol. The preparing method includes the steps that after being subjected to ball milling for 30 min to 36 min, the solid raw materials are preheated for 20 min to 28 min under the condition of 80 DEG C to 85 DEG C, and mixing and prilling are carried out in a mixing machine; master batch obtained by mixing and prilling is subjected to fusing spinning, the temperature is 400 DEG C to 450 DEG C, the pressure is 1*10<5> Pa to 3*10<5> Pa, and a finished product is obtained. The synthetic fiber has the good formaldehyde decomposing function, can be applied to curtains, clothes and textiles, low in production cost, simple and controllable in technology and suitable for industrial production.