108results about How to "Control content" patented technology

The invention discloses an oral solid preparation melogabalin besylate tablet containing an excellent stabilizer and a preparation method thereof. A tablet core contains but is not limited to melogabalin besylate, one or two or more filling agents, one or two or more disintegrating agents, one or two or more flow aids and various stabilizer compositions. According to the invention, the optimal stabilizer composition is selected through investigation, so that the growth of main degradation impurities and oxidation impurities is effectively controlled, the product stability is improved, and the tablets with stable quality are obtained. The product is rapidly dissolved out, the dissolution uniformity is good, the intermediate tabletting is smooth, the compressibility is good, and the prepared finished product is good in appearance, free of small holes and stable and controllable in quality.

The present invention relates to the technical field of automobile steel manufacturing, and in particular to a 780MPa grade ultra-high hole expansion performance cold-rolled complex phase steel plate for automobiles and a preparation method thereof. The steel plate is composed of the following chemical components in weight percentage: C: 0.08% to 0.13%; Si: 0.1% to 0.5%; Mn: 1.8% to 2.5%; Cr: 0.25% to 0.6%; Mo: 0.1% to 0.5%; Ti: 0.01% to 0.04%; Nb: 0.01% to 0.04%; B: 0 to 0.0004%; P≤0.02%; S≤0.01%, and the balance is Fe and unavoidable impurities. The final structure is a ferrite + bainite + martensite complex phase structure, and the microstructure is calculated by volume fraction as follows: critical zone ferrite 10% to 20%, oriented epitaxial ferrite ≤10%, bainite 25% to 35%, martensite 35% to 52%. The yield strength of the present invention is ≥600MPa, the tensile strength is ≥780MPa, the yield ratio is relatively high, and the hole expansion rate is ≥70%, which can meet the requirements of automobile manufacturers for high flanging performance.

The invention relates to a production method of a leaf Tianshi medicine cereal special meal egg, and aims to improve the nutritional value and health benefits of the egg. According to the invention, various beneficial elements such as lecithin, DHA, Omega-3, zinc, selenium, active astaxanthin, active xanthophyll, active high-selenium protein, active germanium element, active zinc element, active vitamin, active vitamin E, iron and the like are blended into eggs through scientific proportioning and a biotransformation technology, and the cholesterol content is effectively controlled, so that the nutritional value of the eggs is remarkably improved. In addition, the production method ensures that the eggs are free of antibiotic addition and high in quality, and the requirements of modern people for healthy food are met. The method comprises the steps of specific feed formula, plant conversion, multiple fermentation, biological conversion and the like, so that not only is the production efficiency improved, but also the stability and consistency of the product are ensured.

The utility model discloses a waste incineration flue gas purification device which comprises a tower body, a dust removal cavity, a deacidification cavity and a gas purification cavity are sequentially arranged in the tower body from bottom to top, and a waste gas inlet communicated with the dust removal cavity and a purified gas outlet communicated with the gas purification cavity are respectively arranged on the tower body. The tower body is provided with a first blowing assembly for blowing adsorption particles into the dust removal cavity and a second blowing assembly for blowing alkaline particles into the deacidification cavity. According to the utility model, the dust removal cavity and the deacidification cavity are arranged in one tower body, and the flue gas is guided to fully react in sequence by blowing the adsorption particles and the alkaline particles so as to achieve the dust removal and deacidification effects, so that the structure and the treatment flow are simplified, and the energy consumption is reduced. By arranging the two stages of cloth bags, particulate matters in the flue gas are adsorbed and filtered, and the content of the particulate matters in the flue gas is also greatly controlled under the effect of ensuring that pollutants are removed as much as possible.

The invention discloses a method for determining dextrocarnitine in a levocarnitine product by using high performance liquid chromatography, and the chromatographic conditions are as follows: cellulose-tri-(3, 5-dimethyl phenyl carbamate) is used as a filler for a chromatographic column, a hexafluorophosphate buffer solution-acetonitrile is used as a mobile phase, the volume ratio is 77: 23-69: 31, the column temperature is 15-25 DEG C, the flow velocity is 0.3-0.5 ml / min, and the detection wavelength is 246nm. The method disclosed by the invention can be used for rapidly and accurately detecting the dextrocarnitine in the levocarnitine product and calculating the content of the dextrocarnitine, is simple to operate and good in reproducibility, can better realize quality control of the levocarnitine preparation and an intermediate product thereof, and provides guarantee for synthesis and preparation process optimization.

The invention provides a light heat-proof and heat-insulation phenolic resin-based composite material and a preparation method thereof. The light heat-proof and heat-insulation phenolic resin-based composite material comprises a reinforcing material and a resin matrix, the resin matrix comprises phenolic resin, a modifier and a light filler; the mass of the modifier is 0.5%-5% of the mass of the phenolic resin; the mass of the light filler is 30-70% of the mass of the phenolic resin; and the modifier is dicyandiamide. The density of the composite material is 0.6-0.9 g / cm < 3 >, and the composite material meets use requirements, is excellent in mechanical property, is formed by adopting a non-autoclave, and is low in manufacturing cost and high in production efficiency.

The invention discloses preparation and application of a yolk-shell structure body phase hydrodesulfurization catalyst based on hydrogen overflow, and the preparation method comprises the following steps: (1) adding nickel nitrate hexahydrate into an aqueous solution of glycerol, isopropanol and deionized water, and carrying out solvothermal reaction on a green solution to obtain a solid spherical nickel composite precursor; (2) mixing the nickel composite precursor with an ethanol solution of thioacetamide, and adding an ammonium heptamolybdate aqueous solution to obtain a turbid liquid; and performing solvothermal reaction on the turbid liquid to obtain the yolk-shell structure catalyst. The yolk-shell structure catalyst with rich NiMoS phases is controllably derived by adopting a limited range vulcanization coupling in-situ intercalation strategy. Under the action of confinement vulcanization, organic molecules are intercalated in situ and assist in constructing stable 1T-MoS2 with short plate length and low stacking, so that full exposure of rim sites is promoted. According to the catalyst, an inner core NiS2 is used as an auxiliary active phase to trigger a hydrogen overflow effect, and cooperation of double active phases is promoted through an egg yolk-shell structure, so that ultra-deep desulfurization of an oil product is realized.

The invention belongs to the technical field of chilled cast iron camshafts, and particularly relates to a manufacturing method of a low-carbon high-silicon chilled cast iron camshaft under the same carbon equivalent, and the manufacturing method comprises the steps of modeling, burdening, smelting, pouring, cooling and unboxing, sand cleaning and detection. Under the condition of the same carbon equivalent, the carbide content of the center of the camshaft can be effectively controlled by strictly controlling the ratio of carbon to silicon and matching with a special inoculant under the conditions of low carbon content and high silicon content, and the obtained chilled cast iron camshaft is good in carbide grade and high in hardness in a metallographic structure, especially excellent in shaft neck macrostructure performance and good in mechanical property. The processing performance and the service life of the chilled cast iron camshaft are greatly improved.

The invention discloses 1000MPa-grade hydroelectric steel with optimized low-temperature toughness and a preparation method of the 1000MPa-grade hydroelectric steel, and belongs to the technical field of steel production. The 1000MPa-grade hydroelectric steel with the optimized low-temperature toughness is prepared from the following chemical components in percentage by weight: 0.03 to 0.09 percent of C, 0.80 to 1.40 percent of Mn, 0.10 to 0.15 percent of Si, 0.05 to 0.14 percent of Cu, less than or equal to 0.003 percent of S, less than or equal to 0.01 percent of P, 0.01 to 0.04 percent of Al, 0.03 to 0.10 percent of V, 0.03 to 0.06 percent of Cr, 0.3 to 0.65 percent of Mo, 0.001 to 0.002 percent of B, 0.01 to 0.018 percent of Ti, 0.015 to 0.025 percent of Nb, 0.18 to 0.60 percent of Ni and the balance of Fe and other inevitable impurities. The preparation method comprises a steel-making process, a heating process, a rough phosphorus removal process, a rolling process and a heat treatment process. By optimizing the chemical components and the preparation process of the 1000MPa-grade hydroelectric steel, the low-temperature toughness of the 1000MPa-grade hydroelectric steel is remarkably improved on the basis that the 1000MPa-grade hydroelectric steel with high strength is obtained, and the 1000MPa-grade hydroelectric steel is suitable for industrial application.

The invention relates to a sintering method for reducing consumption and CO content in flue gas, which comprises the steps of primary screening of fuel, secondary screening of fuel, screening of iron ore charge, primary mixing of small particle size, primary mixing of large particle size, secondary mixing and subsequent sintering, and is characterized in that the fuel and the iron ore are screened, and the fuel with specific particle size and the iron ore charge with specific particle size are respectively and primarily mixed; the method comprises the following steps of: firstly, performing secondary mixing and charging on relatively small materials, performing secondary mixing for a certain time, then charging relatively large materials, and continuously performing secondary mixing, so that the particle size of the sintered ore is relatively uniform, a relatively large amount of fuel can be obtained from the upper layer during sintering, and the effects of reducing consumption and reducing the content of carbon monoxide in flue gas are realized by matching with the setting of a subsequent sintering process.

The invention relates to a method for improving the comprehensive performance of a main shaft gear, which adopts the treatment process of cleaning, preheating, carburizing, high-temperature tempering, quenching preheating, quenching, subzero treatment, low-temperature tempering and gear grinding, so that not only can the depth of a carburized layer be accurately controlled, but also the use performance of a carburized part can be ensured. Wherein the preheating treatment before carburizing can refine grains, obtain a uniform metallographic structure and reduce thermal distortion of parts, the effect of controlling the size stability of the gear is achieved, then the toughness of a carburized layer is improved, and the service life of the gear is prolonged. And then high-temperature tempering after carburization can promote further uniform diffusion of carbon elements on the surface layer, the structure is balanced, and the internal stress of gear parts is reduced. And the preheating treatment before quenching can prevent the part from cracking in the subsequent quenching process. And a proper subzero treatment temperature gradient is selected according to material components, so that the content of retained austenite in a carburized layer is controlled, and the mechanical property and the comprehensive property of the material are improved.

The application relates to a dual-purpose maintenance system for taking out a heart and maintaining the heart extracorporeally, which comprises a perfusion pipeline assembly and an organ box. The design that the organ box is communicated with a blood storage container and is switched can support the no-stop-taking-out and transportation operation of the heart. In the conversion process, the pipeline does not need to be replaced, the heat ischemic injury and ischemia-reperfusion injury of the heart are reduced.

The present application relates to the field of coatings, and in particular to a petroleum pipeline repair coating composition, and its preparation method and application. The raw materials of the petroleum pipeline repair coating composition, in parts by mass, are: 70 to 90 parts of composite epoxy resin, 20 to 30 parts of filler particles, 3 to 5 parts of accelerator, 4 to 6 parts of curing agent, 1 to 2 parts of leveling agent, 1 to 2 parts of defoaming agent, 1 to 1.5 parts of antioxidant, and 15 to 30 parts of functional additives. The petroleum pipeline repair coating composition prepared in the present application can maintain excellent adhesion, corrosion resistance, and wear resistance while having good waterproof and aging resistance properties, meeting the performance requirements for repair coatings in complex petroleum pipeline repair environments, and thus has excellent application prospects.

The present invention relates to the technical field of foaming agents, and discloses a foaming agent and its preparation method and application. The present invention reacts polyethylene glycol and 4,4'-N-benzylaniline dicarboxylic acid, and then reacts with 2-bromoethyl sodium sulfonate to obtain a foaming agent. The foaming agent of the present invention uses the polyether segment of polyethylene glycol as the main chain, and a large number of sulfonate groups are introduced into the side chain, showing a strong surface activity performance. At different mass concentrations, it has a very high foam volume and half-life, and the foaming performance is very good. And in oil field well water with different mineralization degrees, the foam volume and half-life are also very high, the salt resistance is excellent, and the high temperature resistance is good.

The invention provides a carbon fiber reinforced polyether-ether-ketone self-lubricating composite material and a preparation method and application thereof.The preparation method comprises the steps that carbon fiber serves as an anode, voltage is applied to an electrolyte solution, electrochemical oxidation treatment is conducted, hydroxylated carbon fiber is obtained, the hydroxylated carbon fiber and 2-amino-5-nitrobenzothiazole are mixed, and the carbon fiber reinforced polyether-ether-ketone self-lubricating composite material is obtained. Adding an anhydrous modified reaction solvent, and reacting at 25-40 DEG C for 4-10 hours to obtain modified carbon fibers; and melting and granulating the self-lubricating composite material: mixing the modified carbon fiber, polyether-ether-ketone, a lubricant and an auxiliary agent in a high-speed mixer for 10-20 minutes, extruding by using a double-screw extruder, cooling, and granulating to obtain the carbon fiber reinforced polyether-ether-ketone self-lubricating composite material. The carbon fiber reinforced polyether-ether-ketone self-lubricating composite material is applied to self-lubricating mechanical parts. According to the self-lubricating composite material, the self-lubricating performance is improved, the interface bonding energy between the carbon fibers and the polyether-ether-ketone is enhanced, and the self-lubricating composite material has good mechanical performance.

The invention discloses a modified antifriction and antiwear carbon fiber based on self-assembly, a self-lubricating material containing the modified fiber and preparation methods of the modified antifriction and antiwear carbon fiber and the self-lubricating material. The modified antifriction and antiwear carbon fiber based on self-assembly comprises carbon fiber and an organic coating layer formed on the surface of the carbon fiber, and the organic coating layer comprises nanosheets formed by cyclodextrin and lauryl sodium sulfate. The self-lubricating material containing the modified fibers comprises 5-20% of the self-assembly-based modified antifriction and antiwear carbon fibers, 0-10% of polytetrafluoroethylene fibers and more than 70% of an epoxy resin matrix. The modified antifriction and antiwear carbon fiber based on self-assembly can improve the antifriction and antiwear performance of a self-lubricating material.

The present invention relates to a low-warpage low-dielectric PBT composite material and a preparation method thereof, product: by weight, including 20-62 parts of thermoplastic polyester resin composition, 1-10 parts of olefin copolymer, 1-10 parts of toughening agent, 15-35 parts of glass fiber and 10-30 parts of silicon powder; the thermoplastic polyester resin composition includes PBT and PET, the weight portion of PBT in the thermoplastic polyester resin composition is greater than 70%, and the weight portion of PET in the thermoplastic polyester resin composition is not less than 9.5%; method: the raw materials other than glass fiber are mixed to obtain a mixture, the mixture is fed into a twin-screw extruder from the main feed port, and the glass fiber is fed into the twin-screw extruder from the side feed port at the same time, the processing temperature of the twin-screw extruder is controlled to be 220-260°C, and extrusion granulation is performed to obtain the product. The method of the present invention is simple, and the product of the present invention has both excellent low warpage and low dielectric properties.

The invention discloses a preparation method of a high-heat-resistance aluminum alloy, and belongs to the technical field of nonferrous metal manufacturing. Copper-clad aluminum composite powder, iron-clad aluminum composite powder and nickel-clad aluminum composite powder are prepared through a chemical plating method, the powder is mixed according to a certain proportion, slightly oxidized in air and then subjected to vacuum sheathing, and a sheathing powder billet is subjected to hot isostatic pressing or hot extrusion densification treatment; in the densification process, a dual process of internal oxidation and nano heat-resistant phase precipitation is further carried out, and finally two nano heat-resistant phases, namely Al2O3 and an AlFeNiCu intermetallic compound, are formed in the aluminum alloy, so that the heat resistance of the aluminum alloy is remarkably improved.

The invention provides a preparation method of a mirabegron intermediate, which is characterized in that the preparation method comprises the following steps: carrying out condensation reaction on a compound as shown in a formula III and a compound as shown in a formula V in an organic solvent to obtain the mirabegron intermediate VI: # imgabs0 #. D-mandelic acid is ingeniously converted into an acetonylidene analogue through reagents such as 2, 2-dimethoxypropane (DMP) and the like; according to the preparation method, carboxyl on D-mandelic acid is activated and then directly reacts with amino in a compound shown in a formula V, expensive condensing agents such as EDCI and HOBT are not used, toxic reagents such as triphosgene are not needed, materials are economical, easy to obtain and environmentally friendly, the obtained product is high in yield and purity, and the content of isomers can be effectively controlled.

The invention provides a preparation process and application of idebenone, and belongs to the technical field of organic chemistry. The purified 10-hydroxydecanoic acid is obtained through the kaolin composite catalyst, the idebenone is prepared on the basis of the purified 10-hydroxydecanoic acid, meanwhile, the preparation process is improved, the elution crystallization treatment is matched, the purity of the idebenone is effectively improved, the content of impurities in the idebenone is reduced, and the idebenone is applied to cosmetics.

The invention discloses a novel reaction furnace for carbon black production, which is characterized by comprising a fuel chamber, a combustion chamber and a reaction chamber, and a first combustor and a second combustor are sequentially arranged at the joint of the combustion chamber and the fuel chamber; eight fuel injection devices are arranged in the circumferential direction of the first combustor, each fuel injection device comprises a fuel pipe, each fuel pipe is connected with three fuel pipe spray head sets, and the fuel pipe spray head sets are arranged on the inner wall of the first combustor and aligned with the axial circle center. Each fuel pipe nozzle group is aligned in the circumferential direction; the first fuel pipe spray head and the second fuel pipe spray head are oppositely arranged in the axial direction; the second combustor is provided with six fuel injection devices, and the fuel injection devices are spirally distributed on the inner wall of the second combustor. Natural gas and oxygen are rapidly and efficiently mixed; the combustion efficiency is improved, the temperature of the combustion chamber rises quickly, and the oxygen content in the combustion chamber can be effectively controlled.

This invention discloses a method for treating ammonia-containing tail gas, relating to the field of ammonia-containing tail gas treatment. The method involves the ammonia-containing tail gas entering from the bottom of an acid washing tower and passing sequentially from bottom to top through a bottom washing liquid zone, a first packing zone, a second packing zone, a spray zone, and a demister for treatment. The spray zone uses atomizing nozzles to spray out a mixed washing liquid, controlling the pH value and conductivity of the washing liquid. Each atomizing nozzle includes a nozzle body, a first chamber, multiple diversion holes, a second chamber, and an outlet hole formed on the nozzle body and connected sequentially. The opening width of the diversion holes is smaller than the opening width of the outlet holes, and the width of the outlet holes increases along the axial direction. The orthographic projections of the diversion holes and the outlet holes on the end face of the nozzle body near the outlet hole do not intersect. This method can achieve efficient removal of ammonia from the tail gas even when the pH value of the washing liquid is high, resulting in a low acid mist value in the tail gas. It eliminates the need for a secondary water washing tower for treatment, thus reducing costs.

The invention discloses a quality detection method for Helleborus truncatus medicinal materials, which includes a method for determining the content of isofraxidin and scopoletin in Helleborus truncatus medicinal materials, and can accurately and quickly determine the content of Helleborus truncatus medicinal materials, and provide effective qualitative and quantitative analysis means for Helleborus truncatus medicinal materials, thereby facilitating the quality control of Helleborus truncatus medicinal materials. The quality detection method for Helleborus truncatus medicinal materials provided by the invention can effectively control the overall quality of Helleborus truncatus medicinal materials and ensure the safety and effectiveness of clinical use of Helleborus truncatus medicinal materials.

The invention relates to the field of comprehensive recycling of resources, in particular to a method for removing oxalate and removing vanadium in a sodium aluminate solution. The method comprises the following steps: evaporating, concentrating and crystallizing a high-concentration first sodium aluminate solution to obtain a seed crystal, adding the seed crystal into a low-concentration second sodium aluminate solution, inducing oxalate to separate out crystals at a relatively high temperature, filtering to remove oxalate, and further cooling and crystallizing filtrate to recover high-grade vanadium salt. According to the method, oxalate crystal seeds do not need to be additionally added, high-efficiency removal of oxalate at the high temperature is achieved under the condition of low cost, vanadium pentoxide is not prone to being separated out at the high temperature, therefore, vanadium can be further efficiently recycled, and the content of impurities in the recycled vanadium pentoxide is low.

The invention discloses a preparation method of oral antibiotic granules. The preparation method comprises the following steps: 1) treating raw materials and auxiliary materials: preparing an adhesive solution; sieving other raw and auxiliary materials; 2) granulating: adding the raw and auxiliary materials according to the prescription amount into a mixer for mixing; a one-step granulator is used, the air inlet temperature is set, the adhesive solution prepared in the step 1) is added in a top spraying mode for granulation, and the water content of granules is controlled to be 2.1% or below; (3) finishing granules: finishing the granules through a screen; (4) mixing: mixing the whole granules again; and 5) packaging: packaging according to set specifications. The oral antibiotic granules obtained by the invention have good stability and dissolution rate.

This invention discloses a liquid-phase functional urethane antifouling coating, its preparation method, and its application. The preparation method includes the following steps: S1. Mixing monohydroxy-terminated polydimethylsiloxane and polypropylene glycol and removing water to obtain solution A; S2. Dissolving hexamethylene diisocyanate trimer in xylene to obtain solution B; slowly adding solution B dropwise to solution A while continuously stirring; S3. After the addition is complete, heating the reaction to 80-85°C and continuously stirring to ensure a complete reaction, finally obtaining prepolymer C; S4. Adding curing agent polyaspartic acid ester, leveling agent, and defoamer to solution C, and stirring to obtain solution D; S5. Applying solution D to the surface of a substrate and curing at room temperature for 2 hours to obtain a liquid-phase functional urethane antifouling coating. The antifouling coating of this invention can cure at room temperature, is environmentally friendly, inhibits the adhesion of fouling organisms, and has good anti-icing properties.

The invention belongs to the technical field of ferrous metallurgy, and particularly relates to a bar for a desert deep well and a preparation method of the bar, the bar for the desert deep well comprises the following chemical components in percentage by weight: 0.19-0.22% of C, 0.15-0.35% of Si, 0.45-0.55% of Mn, less than or equal to 0.010% of P, less than or equal to 0.001% of S, 0.45-0.55% of Cr, 0.70-0.80% of Mo, 0.02-0.05% of Nb, 0.09-0.11% of V, 0.01-0.025% of Al, 0.01-0.025% of Ti, 0.0015-0.0025% of B, less than or equal to 0.15% of Cu, less than or equal to 0.15% of Ni, less than or equal to 0.020% of Sn, less than or equal to 0.020% of As, less than According to the invention, reasonable component design is carried out on the bar material, so that the bar material has better corrosion resistance and hydrogen induced cracking resistance, and the bar material is suitable for extreme weather in desert areas, and is especially suitable for oil wells with the depth of more than 5000 meters.

The invention relates to a liquid supply device for online mixing of a spinning solution. The liquid supply device comprises a liquid storage tank, two delivery pumps, a three-way joint, a length adjusting device, a mixed liquid supply pipeline, a viscosity sensor, a signal processor and a variable frequency driver, in the spinning solution conveying process, the viscosity sensor monitors the viscosity of a spinning solution in real time and transmits viscosity data to the signal processor, the signal processor analyzes and processes the collected viscosity data and then sends an adjusting instruction to the variable frequency driver, the variable frequency driver controls the pumping speed of the two conveying pumps, and the conveying speed of the spinning solution is adjusted. Therefore, the content of the polymer solution and the auxiliary solution is controlled. The signal processor can also control the length adjusting device, as the grooves are connected with the protrusions in a clamped mode, the mixed liquid supply pipeline can be collected into the sleeve or released out of the sleeve by controlling the crawler belt strips to rotate, and therefore the length of the mixed liquid supply pipeline which is located outside the sleeve and actually used for online mixing is changed. Therefore, the mixing efficiency of the polymer solution and the additive solution is controlled.

The present invention belongs to the technical field of welding materials, and specifically provides a high-toughness flux-cored welding wire, comprising a carbon steel sheath and a flux core filled in the carbon steel sheath, wherein the flux core comprises, by mass percentage, 30-38% TiO2, 5-8% feldspar, 3-5% smelting agent, 2-3% sodium fluoride, 2-5% Si, 13-17% Mn, 4-6% Mg, 2-4% Ni, 0.45-0.75% B, 0.02-0.04% C, and the balance is Fe. The high-toughness flux-cored welding wire provided by the present invention controls the contents of Ni, C, Mn, B and other alloy elements in the weld metal by adjusting the components of the flux sheath, so that the deposited metal has excellent impact toughness in both the welded state and the heat-treated state, and when CO2 gas shielded welding is adopted, the low-temperature impact absorption energy at -40°C is greater than 80J, the tensile strength is higher than 490MPa, the elongation is greater than 22%, and the mechanical properties are stable. Moreover, flux-cored welding wire can be used for all-position welding, with excellent welding process performance, stable arc and beautiful weld formation.

The invention discloses a preparation method and application of a Cu modified SAPO-34 composite material, relates to a preparation method of a catalyst for selective catalytic reduction of NO, and aims to solve the technical problems that active sites of an existing denitration molecular sieve catalyst Cu-SAPO-34 are easy to agglomerate, the low-temperature activity is poor, the hydrothermal stability is poor, and the water resistance and sulfur resistance are poor. The method comprises the following steps: weighing pseudo-boehmite, H3PO4, white carbon black, triethylamine, tetraethylenepentamine and a copper organic complex to prepare sol-gel; wherein the copper organic complex is copper acetylacetonate, copper glycinate or copper ethylenediamine dihydrate; and then the sol-gel is subjected to a hydrothermal reaction, an obtained precursor is calcined, and the Cu modified SAPO-34 composite material is obtained. The denitration conversion rate of the material at 150-430 DEG C can reach 90-100%, and the material has N2 selectivity, resists water vapor and sulfur dioxide, and can be used in the field of NH3-SCR denitration.