313results about How to "Simple processing method" patented technology

The invention discloses a method for preparing a PLA-PCL polyester copolymer for a biomass pressure-sensitive adhesive under a non-catalytic condition, which comprises the following steps: S1, putting L-LA and epsilon-CL into a reaction container, adding ethylene glycol or glycerol into the reaction container, and subsequently carrying out argon protection treatment; s2, heating the reaction container containing the sample at 180-240 DEG C for 3 hours; and S3, after the reaction, forming a uniform system, namely obtaining the PLA-PCL polyester copolymer for the biomass pressure-sensitive adhesive. According to the preparation method, L-LA and epsilon-CL are taken as raw materials, an alcohol compound is taken as an initiator, and the PLA-PCL polyester copolymer for the biomass pressure-sensitive adhesive is directly prepared through reaction at high temperature. The method has the beneficial effects that no catalyst is needed in the reaction process, the process method is simple and convenient, and the preparation process is short in time consumption; the prepared product can be used for preparing a biomass pressure-sensitive adhesive.

The invention discloses a process method for preparing a fluopyram key intermediate. The key intermediate is [3-chloro-5-(trifluoromethyl) pyridine-2-yl] ({[2-(trifluoromethyl) benzoyl] amino} methyl) dimethyl malonate, and the process method comprises the following steps: in the presence of a solvent 1, carrying out a reaction on a compound 2-[3-chloro-5-(trifluoromethyl) pyridyl] dimethyl malonate potassium salt and a compound 1-D in a reaction container, and distilling and recovering the solvent 1 to obtain the intermediate compound. Wherein the solvent 1 is selected from acetic ester solvents with the boiling point range of 40-110 DEG C at normal temperature and normal pressure. The process method is simple and convenient, the total yield is high, the solvent is easy to recover, and the product purity is high; the intermediate does not need purification post-treatment, can be directly used for synthesis of fluopyram, can be amplified, and is beneficial to cost reduction, efficiency improvement and commercial mass production.

The invention discloses a cable assembling and welding control device and method, which are mainly applied to plug fixation of a J27A type electric connector. The cable welding control device is designed and manufactured, the device is provided with a connector fixing clamping groove, a wire harness fixing groove, scales and the like, and the problems that in the production process, the length of a cable is repeatedly measured, a connector is not firmly fixed, and welding is not easy are solved through application of the control device. After workshop review, the device is used in cable assembly part production, the use effect is good, and the assembling and welding efficiency of the cable is effectively improved.

The invention discloses a low-odor soft TPE (thermoplastic elastomer) composite material and a preparation method thereof, and the composite material comprises the following components in parts by weight: 50-100 parts of TPE, 5-20 parts of a deodorant, 150-600 parts of a plasticizer, 1-10 parts of an antioxidant, 1-5 parts of a light stabilizer, 0-20 parts of calcium stearate, 2-10 parts of nano silicon dioxide, 1-5 parts of an organic silicon modifier and 50-150 parts of a bio-based plasticizer. 1-5 parts of nano titanium dioxide, 0.1-1 part of graphene nanosheets and 1-5 parts of a metal organic framework compound; 0.01-0.5 part of carbon nanotubes, 0.5-2 parts of a self-repairing polymer containing microcapsules, and 1-10 parts of an antibacterial agent. By adding the novel deodorant, peculiar smell molecules generated in the hot melting process are effectively captured, adsorbed and degraded, the smell of the product is remarkably reduced, and more comfortable user experience is provided.

The invention discloses a process method for preparing fluopyram. The process method comprises the following steps: in the presence of a solvent 1, reacting a compound 2-[3-chloro-5-(trifluoromethyl) pyridyl] dimethyl malonate potassium salt with a compound 1-D in a reaction container to obtain an intermediate compound, and distilling to recover the solvent 1 without purification treatment of the intermediate compound; adding water, alkali and a solvent 2 into the reaction container for reaction; adjusting the pH value after the reaction, and continuing the reaction; and after the reaction is finished, carrying out post-treatment to obtain the product fluopyram. Wherein the solvent 1 is selected from acetic ester solvents with the boiling point range of 40-110 DEG C at normal temperature and normal pressure. The process method is simple, convenient, high in total yield, low in cost and stable and qualified in product quality, fluopyram is prepared through a one-pot method, production equipment is reduced, investment is reduced, cost is reduced, efficiency is improved, and commercialized mass production is facilitated.

The processing method comprises the following steps: carrying out etching, lamination and UV cutting on a double-sided copper-clad plate A to prepare a first part of which the warping degree is a non-zero value and which is provided with a first copper layer and a through groove; performing single-sided circuit pattern manufacturing on the double-sided copper-clad plate B to obtain a second part provided with an inner-layer circuit; the first component and the second component are connected through a bonding layer in a pressing mode, an intermediate plate B with a blind groove is obtained, and the blind groove is formed by a through groove and a second component which seals one port of the through groove in a partially-enclosed mode; and the bonding layer on the bottom of the blind groove is removed through laser, interlayer conduction, blind groove metallization, outer layer circuit manufacturing and outer layer solder mask operation are carried out on the intermediate plate B, and the Cavity packaging carrier plate is obtained. According to the processing method, the alignment precision of the holes, the grooves and the circuit patterns in the packaging carrier plate can be improved, and the defect that a sandwich structure is prone to deviation in the assembling process is overcome; the alignment degree of the obtained Cavity packaging carrier plate is high, and the packaging test difficulty of a circuit board product is reduced.

The invention discloses an electric arc additive manufacturing method for assisting in titanium alloy grain refinement through coaxial ultrasound. The method comprises the following steps that firstly, an ultrasonic gun is installed on a welding gun in the mode that the ultrasonic gun and a tungsten electrode are coaxial; 2, fully cleaning the surface of the titanium alloy substrate, clamping and fixing the titanium alloy substrate in a to-be-welded area, and adjusting the tip position of a tungsten electrode to the initial position of material increase; thirdly, welding shielding gas is introduced in advance, and after the electric arc is stable, layer-by-layer stacked additive manufacturing is carried out on the titanium alloy substrate through a coaxial ultrasonic auxiliary method; and fourthly, the titanium alloy component obtained after additive manufacturing is completed is cooled and then taken down from the clamp, and the additive manufacturing process is completed. According to the method, the ultrasonic waves are introduced into the electric arc and the molten pool, the electric arc form can be effectively controlled, the fluidity of the molten pool can be effectively improved, then grain size refinement and distribution uniformity of the titanium alloy additive manufacturing component are achieved, the titanium alloy additive manufacturing component is strengthened, the mechanical property of the titanium alloy additive manufacturing component is improved, and the method has very important significance on titanium alloy electric arc additive manufacturing.

The invention belongs to the field of printed optoelectronic device preparation, and particularly relates to a method for improving field effect performance of a printed metal oxide thin film transistor through atmosphere annealing. The invention provides a method for improving the field effect performance of a printed thin film transistor. The method comprises the following steps: cutting a Si / SiO2 substrate and carrying out ultrasonic cleaning for 10 minutes; placing the substrate in a gas plasma generating device to remove impurities adsorbed on the surface of the substrate; dissolving zinc acetate dihydrate, stannous chloride dihydrate and indium nitrate hydrate in ethylene glycol monomethyl ether; printing an active layer of the thin film transistor device and carrying out 550 DEG C air atmosphere annealing treatment; in order to improve the field effect performance of the thin film transistor, annealing treatment is carried out on the metal oxide active layer material in a vacuum atmosphere at the temperature of 550 DEG C; and printing a source electrode and a drain electrode of the thin film transistor by using high-precision ink-jet printing equipment. According to the method provided by the invention, the field effect performance of the printed metal oxide thin film transistor can be improved, and the requirement of a current optoelectronic device on high electrical performance of a printed driving device is met.

The invention discloses an axial flow casing coating hole and runner machining device and method, and belongs to the technical field of aero-engine manufacturing, the axial flow casing coating hole and runner machining device comprises a small drill bit, a large drill bit and a first supporting piece, a middle through hole is formed in the first supporting piece, and the middle through hole is located above a piston piece and is an oil storage cavity; the limiting piece is used for abutting against and pressing an inner hole of the axial flow casing so as to support the axial flow casing, and a pressure adjusting cavity is formed in the limiting piece; the pushing assembly is used for pushing the piston piece to ascend and descend and pushing hydraulic oil in the oil storage cavity into the pressure adjusting cavity when the piston piece ascends, and then the pressure of the pressure adjusting cavity is increased to push the limiting piece to expand and press an inner hole of the axial flow case. On the contrary, when the piston piece descends, pressing and supporting of the limiting piece on the inner hole of the axial flow casing are released. In addition, the coating holes machined through the optimized machining method are good in smoothness, the coating is free of cracking and upheaval phenomena, meanwhile, the machined runner is small in deformation, and the process stability is greatly improved.

The invention relates to the technical field of battery recovery, and provides a comprehensive recovery method of a waste lithium ion battery, which comprises the following steps: drying and winnowing waste battery powder to obtain a diaphragm and diaphragm-removed waste battery powder; performing XRT photoelectric separation on the membrane-removed waste battery powder to obtain positive pole piece powder and negative pole piece powder; grinding, screening and removing aluminum from the positive pole piece powder, mixing the positive pole piece powder with a diaphragm, and carrying out anaerobic roasting to obtain roasted slag; carrying out magnetic separation on the roasting slag to obtain a non-magnetic product; carrying out acid leaching treatment on the non-magnetic product to obtain filter residues A; carrying out acid leaching treatment, screening and filter pressing on the negative pole piece powder to obtain filter residues B; and mixing the filter residue A and the filter residue B, and performing heat treatment in a graphitization furnace to obtain the battery-grade graphite. According to the comprehensive recovery method, the waste lithium iron phosphate battery and the waste ternary lithium battery can be treated at the same time, an additional reducing agent does not need to be added for reduction roasting reaction, and the recovery cost is reduced.

The invention relates to the technical field of functional new materials, in particular to a wireless electromagnetic wave high-transmission infrared low-emissivity material and a preparation method thereof. The infrared low-emissivity material with high wireless electromagnetic wave transmission has a reflection effect in 2-20 [mu] m wave band infrared rays, and has a direct transmission effect in a 100 kHz-1.6 THz communication electromagnetic wave band; the infrared low-emissivity material with high wireless electromagnetic wave transmission comprises a scatterer. The material has the advantages that the problems that an existing low-emissivity material has an electromagnetic shielding effect, application is limited and the like are solved, the preparation method is simple, and the material can be applied to radiation heat preservation and heat insulation in the fields of new energy automobiles, low-carbon energy-saving buildings, cold-chain logistics, low-carbon agriculture, smart cities and the like and infrared thermal camouflage compatible with a multiband stealth technology; good application prospects are realized.

The invention provides a preparation method of a through-type silver-copper composite material used as a melt, and the preparation method comprises the following steps: carrying out multi-pass slotting treatment on the surface of a coiled copper strip along the length direction, and forming a plurality of grooves penetrating through the width direction of the copper strip on the surface of the copper strip; special-shaped machining is conducted on the two side faces of the groove; silver strips are positioned in the multiple grooves correspondingly, and continuous cold compounding is conducted through a special-shaped roller set; carrying out heat treatment on the material obtained by cold compounding; performing multi-pass cold rolling-annealing on the material subjected to heat treatment to obtain a composite material strip; and the composite material strip is brushed, so that the silver layer with the preset width is exposed from the bottom of the groove, and the through type silver-copper composite material used as the melt is formed. The composite interface bonding strength of the silver-copper composite material can be enhanced, and the production efficiency of the silver-copper composite material and the quality stability of the fuse melt are improved.

The invention relates to the technical field of traditional Chinese medicinal material processing, in particular to a rhizoma polygonati medicinal material and a processing method thereof.The processing method comprises the steps that the rhizoma polygonati medicinal material is subjected to root hair removal, cleaned, placed in a steamer to be steamed for 2 h in a water isolation mode, taken out, sliced and dried for 6-9 h at the temperature of 50-70 DEG C, rhizoma polygonati raw decoction pieces are obtained, vine tea extraction juice is added into the rhizoma polygonati decoction pieces according to a certain solid-to-liquid ratio, covered moistening is conducted for 8-10 h, and the rhizoma polygonati raw decoction pieces are obtained. After the ampelopsis grossedentata extracting juice is absorbed, putting the ampelopsis grossedentata extracting juice into a steamer to be steamed for 2-5 hours in a water isolation manner, taking out the ampelopsis grossedentata extracting And steaming for 3-6 times according to the steps to obtain the prepared rhizoma polygonati decoction pieces. The processing method is simple, feasible and easy to operate. By adopting the optimized process, the oxidation resistance of the prepared rhizoma polygonati decoction pieces is improved by 39.68%, the content of 5-hydroxymethylfurfural is reduced by 64.48%, the internal quality of rhizoma polygonati processed products is improved, and a new thought is provided for the rhizoma polygonati processing process.

The invention relates to the technical field of heat dissipation of microelectronic components, in particular to a phase-change heat dissipation device with a spiral coil structure for a microtube heating component, which comprises a base tube, an inner-layer heat dissipation assembly and an outer-layer heat dissipation assembly, and is characterized in that the inner-layer heat dissipation assembly comprises a phase-change heat dissipation layer arranged in a tube shell and a heat source micro-pipeline embedded in the phase-change heat dissipation layer; comprising an outer-layer heat dissipation component inserted into a phase change heat dissipation layer, a heat removal component arranged on a tube shell, an air inlet component arranged on the heat removal component and a driving component arranged on the tube shell, through the arrangement of the outer-layer heat dissipation component, a heat dissipation plate conducts heat dissipation on the phase change heat dissipation layer, the heat dissipation area is increased, and through the arrangement of a heat dissipation cover, the heat dissipation effect is improved. Passive heat dissipation and active heat dissipation are combined, and the efficiency of passive heat dissipation is improved.

The invention discloses a preparation method of a wear-resistant photo-thermal super-hydrophobic coating, and the preparation method comprises the following steps: (1) adding SiO2 nanoparticles and a dispersant into deionized water for dispersion, then adding a fluorine-containing silane coupling agent, and fully stirring to obtain a fluorine-modified SiO2 dispersion liquid; (2) depositing candle ash, adding the obtained candle ash into the fluorine-modified SiO2 dispersion liquid, performing ultrasonic dispersion, and performing stirring reaction to obtain a super-hydrophobic coating; and (3) spraying the obtained super-hydrophobic coating on a pretreated base material, and drying to obtain the wear-resistant photo-thermal super-hydrophobic coating. The process method is simple, and the obtained coating has good photo-thermal performance, super-strong hydrophobic performance and abrasion resistance and excellent photo-thermal anti-icing performance.

The invention discloses an active and passive composite imaging method based on noise waves and a radar system, relates to the technical field of radar systems and target detection, and solves the problem that active imaging and passive imaging cannot be simultaneously realized by using one set of system due to different transmitting and receiving systems of an active system and a passive system. The method comprises the following steps: designing noise wave modulation, obtaining noise wave modulation information, and obtaining original data of an observation scene; performing pixel division on the original data according to the pixel size, the sampling frequency and the scanning speed; obtaining a correlation value and a mean value of the corresponding pixels according to the original data and noise wave modulation information in the divided pixels; obtaining active information data and passive information data according to the correlation value, the mean value, the active information and the passive information; and according to the active information data and the passive information data, obtaining an active information image and a passive information image, and completing imaging. The method is suitable for typical target detection scenes of sea surface, air and land.

An anti-arching and mirror surface protection method for mirror surface stainless steel welding comprises the following steps that (1) a mirror surface stainless steel plate is fixed, the mirror surface stainless steel plate is placed on a carbon steel plate, and a mirror surface protection film and a pressing block are sequentially placed on the mirror surface stainless steel plate; the thickness of the mirror surface stainless steel plate is 5-8 mm, and the thickness of the carbon steel plate The carbon steel plate needs to be preheated before welding, and the preheating temperature is 60-100 DEG C; (2) the mirror surface stainless steel plate is welded, and flux-cored wire gas shielded welding is adopted in the welding method; the diameter phi of a welding wire ranges from 1.2 mm to 1.4 mm, the welding current ranges from 180 A to 210 A, the welding voltage ranges from 23 V to 27 V, the welding speed ranges from 200 mm / min to 240 mm / min, and the flow of shielding gas CO2 ranges from 15 ml / min to 20 ml / min; (3) symmetric welding is adopted in the welding sequence; during welding, welding is conducted from the center of a welding seam to the two sides, and welding stopping is conducted at the position 10-50 mm away from the end of the mirror surface stainless steel plate And (3) polishing after welding: polishing the welding burning loss part of the mirror surface stainless steel until the mirror surface state is polished.

The invention relates to the technical field of wastewater treatment, in particular to a high-concentration unsymmetrical dimethylhydrazine wastewater treatment method which comprises the following steps: A) performing filtration pretreatment on unsymmetrical dimethylhydrazine wastewater; b) directly performing electron beam circulating irradiation treatment on the filtered wastewater, and accumulating the electron beam absorbed dose without adding chemical agents; c) detecting unsymmetrical dimethylhydrazine concentration and COD (Chemical Oxygen Demand) concentration of the wastewater subjected to electron beam irradiation treatment; when the removal rate of unsymmetrical dimethylhydrazine in the wastewater is greater than or equal to 90% and the removal rate of COD (Chemical Oxygen Demand) is greater than or equal to 80%, the wastewater enters an electrochemical reactor to be subjected to electrochemical reaction; d) detecting unsymmetrical dimethylhydrazine concentration and COD (Chemical Oxygen Demand) concentration of the wastewater after the electrochemical reaction; and when the concentration of unsymmetrical dimethylhydrazine in the wastewater is less than 0.5 mg / L and the COD is less than 120mg / L, entering the next step of treatment when the treatment requirement is met. According to the method, the degradation rate of unsymmetrical dimethylhydrazine and the COD removal rate can be effectively improved, and harmless treatment of the wastewater can be realized by adopting simple operation steps.

The invention discloses a method for measuring the content of aluminum in a composite propellant, which comprises the following steps: digesting a sample by using nitric acid and hydrogen peroxide through microwaves, and then fixing the volume and diluting to prepare a sample solution; aluminum element standard solutions with a series of concentrations are prepared, the spectral intensity of the standard solutions is measured through inductively coupled plasma emission spectroscopy, and a standard curve is drawn; and measuring the sample solution under the same condition, calculating the aluminum element concentration through the standard curve, and further calculating the aluminum content in the sample. The method is simple to operate, low in reagent consumption, high in detection efficiency and good in repeatability, has no special requirements on the types of the components of the composite propellant, has universality and can be used for determining the aluminum content in the composite propellant.

The invention discloses a silicon-carbon negative electrode material with a yolk-eggshell structure and a preparation method of the silicon-carbon negative electrode material, and belongs to the technical field of new energy materials and energy electrochemistry. The preparation method comprises the following steps: by taking photovoltaic silicon waste as a silicon source, heating in an air atmosphere to generate a silicon oxide layer on the surface of a silicon particle, then coating a layer of carbon shell outside, and finally removing a silicon oxide middle layer by hydrofluoric acid to obtain the silicon-carbon negative electrode material Si (at) Void (at) C. The obtained material is of a yolk-eggshell structure, micron-sized silicon particles are adopted as an inner core, and the silicon-carbon negative electrode material Si (at) Void (at) C is obtained. The shell is amorphous carbon, and a reasonably designed void space is formed between the particles and the shell, so that a buffer space can be provided for expansion of the silicon particles, and the cycle performance of the silicon-carbon negative electrode material is improved; the whole preparation process is simple, the price of the photovoltaic silicon waste is low, large-scale production is facilitated, high-value conversion and utilization of waste resources are achieved while the cost is reduced, and obvious economic value and social value are achieved.

The invention belongs to the field of preparation of high-purity quartz, and relates to a method for directionally removing impurity elements of pegmatite type high-purity quartz, which comprises the following steps: (1) crushing raw materials by a crusher, washing ore, grinding and grading, reselecting and floating to obtain quartz concentrate; (2) adding the quartz sand into the leachate A for constant-temperature micro-pressure leaching, and washing to obtain primary quartz sand; the leachate A is mixed acid of HF, HCl and HNO3, the concentration ratio of the HCl to the HNO3 is (3-12): 1, the concentration ratio of the HCl + HNO3 to the HF is smaller than or equal to 3, and the sum of the concentrations of the HCl, the HCl and the HNO3 is larger than or equal to 3 mol / L; (3) roasting and water quenching to obtain intermediate quartz sand; (4) adding the quartz sand into the leachate B for ultrasonic leaching, washing, and carrying out high-temperature heat treatment to obtain high-purity quartz sand; the leachate B is a mixed acid of HF and HCl, HF is 0.5-2 mol / L, and the concentration ratio of HCl to HF is less than or equal to 3. According to the method, the 4N8-grade high-purity quartz sand can be obtained, the yield is high, the process is simple, and operation is easy.

The invention discloses an oxygen element doped sulfide electrolyte, a preparation method and application thereof, the surface of the sulfide electrolyte contains a uniform oxide coating layer, and the interior of the sulfide electrolyte is doped with an oxygen element; the thickness of the oxide surface coating layer is 1-50nm, the oxygen element of the oxide-doped sulfide electrolyte is in gradient distribution, the structure can improve the air stability of the sulfide electrolyte, and the structure also can ensure that the oxygen coating shell is not easy to fall off because the doped oxygen element is less in amount and less in ionic conductivity loss, so that the performance of the sulfide electrolyte is improved. And the air stability of the sulfide electrolyte is further improved.

The invention discloses a double-alloy sintered neodymium-iron-boron permanent magnet and a preparation method and application thereof, and relates to the technical field of rare earth permanent magnet materials. Comprising the following steps that a main alloy and an auxiliary alloy are evenly mixed and then subjected to orientation profiling, cold isostatic pressing, liquid phase sintering and tempering heat treatment in sequence, the double-alloy neodymium iron boron permanent magnet is prepared, the chemical composition of the auxiliary alloy is AlxRE2yM100-x-y, RE2 is selected from one or more combinations of Ce, Dy, Gd, Ho, La, Nd, Pr, Tb and Y, and M is selected from any one or more combinations of Co, Cu, Ga, Ti, Zr and Nb; x and y satisfy 5 < = x < = 50 and 20 < = y < = 80; according to the method, on the premise that the magnetic performance of the neodymium iron boron permanent magnet is synchronously optimized, the mechanical performance of the neodymium iron boron permanent magnet is further improved, the mechanical performance and the magnetic performance of the sintered magnet have good consistency and stability, the technological method is simple and easy to implement, and the method is suitable for industrial production.

The application relates to a method for preparing a deformable reinforcing metal matrix composite material by a pressure infiltration technology, and relates to a method for preparing a metal matrix composite material. In order to solve the problems of poor plasticity of the metal matrix composite material and difficulty in preparing a deformable reinforcing aluminum matrix composite material by a self-exhaustion pressure infiltration technology, the application mixes reinforcing body powder with polysilazane, and then sintering, the polysilazane is cracked at high temperature and a ceramic skeleton is generated, the structural strength of the preform in a high-temperature state is improved, and the success rate of the self-exhaustion pressure infiltration process for preparing the deformable reinforcing metal matrix composite material is effectively improved. The application realizes the function of preparing a heterogeneous aluminum alloy by the pressure infiltration technology, and has better strength-plasticity matching compared with a homogeneous alloy with the same composition.

The invention discloses a light ablation-resistant tungsten aluminizing dissipation heat-proof composite material for a throat liner and a preparation method thereof, and relates to a tungsten aluminizing dissipation heat-proof composite material and a preparation method thereof. The problems that an existing rocket engine throat liner material is large in density and prone to oxidation ablation, and then reliability is low are solved. The light ablation-resistant tungsten aluminizing dissipation heat-proof composite material for the throat liner is formed by compounding a dissipation agent and a tungsten framework; the dissipation agent is filled in gaps of the tungsten framework; the dissipation agent is an aluminum alloy and is composed of Al, Mg, Cu and Si. The aluminum alloy is used as a dissipation agent, and the aluminum alloy has the characteristics of low melting point and high volatility, so that a large amount of heat can be quickly taken away, and the surface temperature of the material is reduced. The aluminum alloy dissipation agent forms a melt to serve as a reducing agent to react to form a compact high-temperature-resistant aluminum oxide layer, the good heat insulation effect and the good anti-oxidation effect can be achieved, and the problem that due to oxidation ablation at the high temperature, the grain boundary strength is reduced, and then the overall strength of the material is low is solved.

A method for preparing a high-temperature ablation-resistant chopped carbon fiber reinforced SiBCN‑MAS composite material, which relates to a method for preparing a SiBCN ceramic-based composite material. The present invention aims to solve the problem that the existing carbon fiber or cracked carbon coated carbon fiber reinforced SiBCN ceramic-based composite materials have poor contact surface bonding and limited improvement in high-temperature ablation resistance. Method: 1. Prepare cracked carbon coated chopped carbon fibers; 2. Prepare SiBCN amorphous ceramic powder; 3. Mix raw materials; 4. Sinter. The present invention is used for the preparation of high-temperature ablation-resistant chopped carbon fiber reinforced SiBCN‑MAS composite materials.

The present invention relates to a method for recovering low-concentration hydrofluoric acid to prepare anhydrous hydrogen fluoride, comprising the following steps: (1) adding a certain amount of sodium fluoride and other sodium salt powders to waste acid containing hydrofluoric acid to carry out a fluorination reaction; (2) filtering after the fluorination reaction, drying the sodium hydrogen fluoride filter cake to remove surface water and then introducing it into a sodium hydrogen fluoride decomposition furnace for decomposition; (3) part of the sodium hydrogen fluoride filtrate is used to prepare sodium fluoride slurry, and part is neutralized; (4) the hydrogen fluoride gas generated by the decomposition of sodium hydrogen fluoride is refined through condensation and refining processes to obtain anhydrous hydrogen fluoride products. The treatment method of the present invention is simple, low in cost, and high in recovery efficiency, and is suitable for industrial promotion and application; the present invention converts fluorine-containing waste acid into fluorine products with high added value and market demand, which not only solves the problem of warehouse expansion in enterprises, but also realizes the recycling of fluorine resources.

The invention relates to the technical field of optical cement, and discloses a method for improving the bending resistance of optical OCA (Optical Clear Adhesive), which comprises the following steps: adhering the optical cement to a functional layer of an optical element, and standing for 1-30 days in an environment of 35-100 DEG C; the optical cement is a block copolymer, the structural general formula of the block copolymer is M < 1-b >-M < 2-b >-M < 3 >...-b-M < j >, and the value range of j is 3-11; wherein M1, M2, M3... Mj are comonomers in the block copolymer, and the number-average molecular weight of the block copolymer is 800000-800000 g / mol; the comonomer comprises a soft monomer, a hard monomer or a functional monomer; and the mass contents of the soft monomer, the hard monomer and the functional monomer in the block copolymer are respectively 70-98%, 2-30% and 0-5%. According to the method, the bonded optical element is subjected to heating and standing treatment, so that the bonding strength of the optical cement and the functional layer of the optical element can be effectively improved, the surface of the treated optical element still has no obvious crease after being repeatedly folded for 0.5-300,000 times, and the treated optical element also has no obvious yellowing phenomenon after being subjected to high-temperature treatment.

The invention discloses a method for determining the content of amylose and amylopectin in corn through a full-automatic flow injection analyzer method, and particularly relates to the field of determination of the content of amylose and amylopectin in corn, the method comprises the following steps: taking a corn kernel sample, crushing into powder, and passing through a 80-mesh screen to obtain corn kernel sample powder; the corn kernel sample powder is subjected to reflux extraction degreasing through a degreasing agent, and a degreased corn kernel sample is obtained; the method comprises the following steps: weighing a degreased corn kernel sample, putting the degreased corn kernel sample into a conical flask, adding a 95% ethanol solution, transferring a sodium hydroxide solution into the conical flask, and heating the conical flask in a boiling water bath for 10 minutes to obtain a to-be-detected corn sample with starch dispersed; taking out the to-be-detected corn sample, cooling to room temperature, transferring into a volumetric flask, adding distilled water to a constant volume, shaking uniformly, analyzing by a flow injection analyzer, and calculating to obtain the content of amylose in the corn sample. The method has the advantages of high automation degree, high detection speed and simple sample treatment.

The invention relates to the technical field of preparation of biological fertilizers for rotten vegetable leaves, in particular to a biological fertilizer for rotten vegetable leaves, which is prepared from the following raw materials in parts by weight: 25-35% of rotten vegetable leaves, 40-50% of sheep manure, 8-12% of straw, 12-18% of humic acid compost and 0.4-0.6% of microbial agent added into 12-18% of humic acid compost. The preparation method of the rotten vegetable biological fertilizer comprises the following steps: step 1, diluting a microbial agent by 100 times with water, and culturing for 8-12 hours; step 2, uniformly mixing various raw materials, adjusting the moisture proportion, uniformly spraying the cultured bacterial liquid into organic materials while stirring, adjusting the humidity to be about 45-60%, kneading the organic materials into balls without dripping water and loosening the organic materials after loosening, and starting composting; and step 3, spraying the culture bacteria solution for the second time during the first turning, and then turning for 1-2 times according to the situation so as to achieve the effects of ventilation and oxygen supply and improve the compost quality. The method for treating the rotten vegetable biological fertilizer is simple and easy to implement and can be easily accepted by the masses.