51results about How to "Small volume shrinkage" patented technology

The invention discloses a multi-objective optimization method for double-material injection molding process parameters. The multi-objective optimization method comprises the following steps: firstly, obtaining a simulation result data set based on Moldflow simulation analysis and a Taguchi test; then, on the basis of the simulation test data set, a GAM model is constructed and then trained, super-parameters of GAM are optimized through a GTO algorithm, and a GTO-GAM model between injection molding process parameters and a quality optimization target is established; then, performing multi-target optimization on the GTO-GAM model through an MODA algorithm to obtain a Pareto leading edge of a quality optimization target; and finally, determining an optimal combination of process parameters in the obtained Pareto leading edge of the quality optimization target through a CRITIC-TOPSIS evaluation method. According to the method, the buckling deformation and the volume shrinkage rate of the double-material injection molding plastic part can be effectively reduced, and a theoretical basis and data support can be provided for obtaining the optimal technological parameter combination of double-material injection molding.

The invention discloses a multi-objective optimization method for injection molding process parameters. The method comprises the following steps: firstly, obtaining a simulation result data set based on Moldflow simulation analysis and CCF; then, an NGO-XGBoost is adopted to construct an injection molding quality optimization model; then explaining and analyzing the NGO-XGBoost model by using an SHAP method to obtain importance and positive and negative influences of each optimization design variable on a prediction quality optimization target, and performing multi-target optimization through MOMVO to obtain a Pareto leading edge; and finally, determining an optimal combination of process parameters through a CRITIC-TOPSIS evaluation method. According to the method, the buckling deformation and the volume shrinkage of the ABS plastic injection molding plastic part can be effectively reduced, so that a high-quality ABS plastic part product is obtained, and a theoretical basis and data support can be provided for obtaining an optimal technological parameter combination of ABS plastic injection molding.

The invention relates to a modified fly ash-based mining filling material and a preparation method thereof. The material comprises the following components: modified fly ash, lime, cement, gypsum, sodium sulfate, epoxy resin and the like. By using a composite modification system of the nitrogen-containing silane coupling agent, triethanolamine and organic acid, the dispersity of the fly ash is improved, and the fly ash is uniformly distributed in the slurry; lime, gypsum and sodium sulfate are used as excitants, so that the filling material keeps good strength and stability at high temperature, and the risk of structural damage caused by temperature rise is avoided; and meanwhile, the material cannot be excessively embrittled or the strength of the material is not reduced in a low-temperature environment. Besides, due to the excellent bonding performance of the added epoxy resin, the fly ash, the cement and other materials can be effectively glued into a filling body with certain strength and stability, the epoxy resin is also beneficial to reducing the internal stress and deformation of the cured materials, and the long-term stability of the filling body is ensured. The filling material disclosed by the invention is particularly suitable for mine filling and supporting operation, and can provide a reliable filling effect under an extreme temperature condition.

The invention relates to the technical field of porous material preparation processes, in particular to a preparation method of light low-thermal-conductivity lutetium silicate aerogel, which comprises the following steps: preparing composite sol; preparing and aging wet gel; drying the gel; preparing the aerogel; the lutetium silicate aerogel is prepared by combining in-situ sol-gel with a supercritical drying process, and the lutetium silicate aerogel has relatively high porosity, can be in a light, crack-free and complete block shape, and can be used for near-net size forming; the method is simple to operate, can realize fluidized production, and is easy to industrialize; the lutetium silicate ceramic aerogel prepared by adopting an in-situ synthesis mode has higher porosity, better thermal stability and lower thermal conductivity, and can tolerate the extreme temperature of 1500 DEG C.

The invention discloses a process for repairing ceramic glaze defects, which comprises the following steps of: A, polishing the defect part of ceramic into a U-shaped groove, and wetting the U-shaped groove to obtain pretreated ceramic; b, the U-shaped groove of the pretreated ceramic is filled with the repairing base material, and the repairing base material is compacted to obtain a repairing bottom layer; c, the repairing bottom layer is sequentially dried and polished, so that the surface of the repairing bottom layer is flush with the surface of the pretreated ceramic; d, the surface of the repairing bottom layer is filled with repairing cover glaze and compacted, and a repairing surface layer is formed; and E, the pretreated ceramic with the repairing surface layer is placed in a shuttle chamber kiln, and repairing is completed. According to the repair process for the ceramic glaze defects, the repair base material formula and the repair process are optimized, so that the firing shrinkage rate and the cracking possibility are reduced, the repair strength is improved, and on the premise of ensuring the repair effect, the repairable defect range can be widened; and the repaired ceramic glaze defect part can be flat and smooth, and the aesthetic property is ensured.

The invention discloses a method for preparing a conductive ceramic with controllable resistivity, and relates to the technical field of conductive ceramics. The invention adopts three different particle sizes of aluminum oxide, titanium nitride, and silicon dioxide to form a ceramic slurry, which reduces the possibility of deformation, and adjusts the amount of titanium nitride added to adjust the ceramic resistivity, thereby realizing the controllable resistivity of the ceramic; the invention adopts methacrylic acid glycidyl ether and starch to form a gel skeleton, and uses amino-treated nanographite sheets as a support to ensure the mechanical strength of the ceramic; the ceramic slurry is used as a core material, and then a layer of gel is wrapped around the outer layer of the core material, and a three-stage high-temperature sintering treatment is performed to optimize the strength of the ceramic, while making the zirconium ions and nickel ions doped with the gel combine with the lanthanum ions in the atomized liquid, and form a zirconium-nickel-lanthanum-carbon crystal structure under a H2O / O2 atmosphere, which greatly improves the conductivity of the gel layer, thereby forming a uniform and continuous conductive path on the surface and inside of the ceramic.

The invention discloses a photosensitive resin for SLA3D printing precision casting and a preparation method thereof. The preparation raw materials comprise the following components in percentage by mass: 40 to 60 weight percent of polyether acrylate resin oligomer, 30 to 50 weight percent of polyether monomer diluent, 3 to 6 weight percent of photoinitiator, 0 to 5 weight percent of coloring agent, 0.5 to 1 weight percent of polymerization inhibitor, 0.1 to 3 weight percent of nano filler, 10 to 15 weight percent of micronized wax powder and 0.1 to 1.5 weight percent of flatting agent. According to the photosensitive resin disclosed by the invention, the nano filler is introduced, so that the resin can keep high dimensional stability, mechanical property and compatibility with a molten metal solution under a high-temperature casting condition, and high temperature resistance, high strength, high toughness and high wear resistance are achieved; and wide application of the SLA3D printing technology in the high-precision and advanced fields of aerospace, automobile manufacturing, medical instruments and the like is promoted.

The invention relates to a high-strength and high-elasticity organic silicon light-cured 3D printing material and a preparation method thereof.The preparation method comprises the steps that multi-arm vinyl silicone oil with macrocyclic phenyl siloxane as a core, a polysiloxane polymer containing silicon-hydrogen groups, filler and auxiliaries are mixed and stirred to be uniform according to the mass percent, then a photoinitiator is added, the mixture is stirred to be uniform, and the high-strength and high-elasticity organic silicon light-cured 3D printing material is obtained; the organic silicon photosensitive resin material is prepared. According to the preparation method, the ultraviolet light is adopted to initiate local short-time curing of the addition type organic silicon material, rapid curing forming of the organic silicon material in the photocuring 3D printing process is achieved, and a formed part is colorless and transparent and has good mechanical performance. Vinyl silicone oil used in the process method is multi-arm vinyl silicone oil, has the characteristics of excellent thermal stability, good mechanical property, low dielectric constant, excellent biocompatibility and the like, has a three-dimensional and regular structure and high surface functional group density, and can increase crosslinking sites of hydrosilylation reaction to form a compact crosslinked network structure; the mechanical property of the material is improved.

The invention provides a dopamine hybrid ligand ZIF-8 / gelatin composite aerogel and a preparation method and application thereof, and belongs to the field of composite aerogel and preparation thereof.The growth rate of ZIF-8 nanocrystals is accurately controlled through dopamine hybrid coordination metal ions, stable ZIF-8-DA hybrid crystals are formed, and the stability of the aerogel is improved. The crystal not only solves the problem that the traditional MOF material is easy to aggregate particles, but also retains abundant chemical functional groups; furthermore, the ZIF-8-DA and a gelatin matrix are compounded by adopting a multi-crosslinking strategy and a freeze-thaw treatment technology to obtain the composite aerogel with a unique three-dimensional porous microstructure, so that the mechanical strength and the structural stability of the composite aerogel are remarkably improved, and the composite aerogel shows better heat-insulating and flame-retardant properties; the composite aerogel material prepared by the scheme has excellent heat insulation and flame retardant properties, and is suitable for high-energy-consumption fields such as building energy conservation, industrial heat management and environmental flame retardance.

The invention relates to photo-thermal dual-curing hyperbranched resin, a synthesis method and an ultraviolet curing resin composition for 3D printing. The invention relates to a synthetic method of photo-thermal dual-cured hyperbranched resin. The synthetic method comprises the following steps: adding isocyanate and a catalyst 1 into a reaction kettle at 55-60 DEG C; 2, 2-dimethylolbutyric acid is dissolved in a diluent, then dropwise added and subjected to a heat preservation reaction until an intermediate product A1 is obtained; adding a catalyst 2, and continuously reacting at 65-70 DEG C to obtain an intermediate product A2; and cooling to 55-60 DEG C, dropwise adding a mixture of tert-butylaminoethyl methacrylate and a polymerization inhibitor, and carrying out a heat preservation reaction until the isocyanate value is less than 0.5% to obtain the photo-thermal dual-curing hyperbranched resin, which has the characteristics of low viscosity, high functionality, high activity and reduced volume shrinkage, can be used for preparing an ultraviolet curing resin composition for 3D printing, and has wide application prospects. The material has high rigidity and good toughness at the same time.

The invention discloses a method for preparing a high-performance closed-cell perlite material by a chemical method, the prepared high-performance closed-cell perlite material is mainly used in the field of buildings, and the method comprises the following steps: S1, expanding; s2, film covering; s3, dispersing; s4, grading; according to the invention, a layer of silica sol film is formed on the surface of the closed-cell perlite, the film layer not only significantly reduces the volume shrinkage of the closed-cell perlite in the subsequent slurry stirring process, but also effectively hinders the expansion of cracks in the perlite and greatly reduces the cracking risk, and meanwhile, the heat conductivity coefficient of the material is also reduced by film coating treatment, so that the thermal conductivity of the material is improved. The thermal insulation performance is obviously improved; according to the drying furnace, through cooperative use of the drying mechanism and the adjusting mechanism, the air outlet pipe can be driven to swing up and down in a reciprocating mode, so that the air blowing angle of the air outlet pipe is adjusted according to use requirements, hot air can be blown to different areas in the furnace body, the air blowing range is widened, and the perlite drying effect is improved.

The invention discloses a preparation method of silicon dioxide composite thermal insulation aerogel. According to the invention, o-phthalaldehyde is used as a cross-linking agent to prepare the silicon dioxide composite thermal insulation aerogel with thermal insulation function, high skeleton strength and good adsorption capacity, and on the basis, sodium lauroyl glutamate is used as an air template to prepare the new silicon dioxide composite thermal insulation aerogel. On the premise that the whole gelation process is not damaged, the pore volume of the aerogel is increased, the separation effect in oil-water separation is further improved, the excellent flame-retardant capability is shown, and finally, the flame-retardant aerogel can be used for preparing oil-water separation oil-water separation oil-water separation oil-water separation oil-water separation oil-water separation oil-water separation oil-water separation. Chitosan is selected to be subjected to quaternization modification and then is directly compounded with hydrophobized silicon dioxide aerogel powder to obtain the improved silicon dioxide composite heat preservation type aerogel, the improved silicon dioxide composite heat preservation type aerogel not only has a more complex and slender framework structure, but also increases the overall surface area and surface roughness of the gel, and the adsorption capacity of the aerogel is further enhanced.

The invention relates to low-density aerogel with underwater elasticity as well as a normal-pressure atmospheric drying preparation method and application thereof, and belongs to the technical field of aerogel preparation methods. The invention provides a low-density aerogel with underwater elasticity and a normal-pressure atmospheric drying preparation method thereof in order to solve the problem that when the low-density aerogel is prepared through normal-pressure drying, the structure collapses easily. The low-density aerogel has a double-nanofiber skeleton composed of oxidized cellulose nanofibers and silicon dioxide nanofibers and is prepared by adopting a normal-pressure atmospheric drying method. Before and after the aerogel is dried, the volume shrinkage rate is 8.37 + / -1.62%, and the density is only 10.86 + / -0.32 mg cm <-3 >; the porosity is gt; according to the present invention, the maximum compressive strain of the material can reach 117.65 kPa when the air impact compressive strain is 80%, and the maximum compressive strain of the material can reach 13.26 kPa when the water compressive strain is 80%, such that the excellent underwater elastic property and the excellent shape memory property can be provided.

The invention discloses a preparation process of a shrinkage-resistant carbon fiber composite material. The invention uses 2,4,6-tris(4-aminophenyl)-1,3,5-triazine to react with chlorinated carbon fiber, and then reacts with the epoxy group of epoxidized soybean oil to obtain hydroxy triazine epoxy soybean oil modified carbon fiber, and introduces a large number of hydroxyl groups and epoxy soybean oil molecular chains on the surface of the carbon fiber. When preparing polyurethane foam, hydroxy triazine epoxy soybean oil modified carbon fiber is added, and a large number of active hydroxyl groups are introduced into the carbon fiber, which can be used as a grafting polymerization site, and a grafting reaction occurs with polyether polyol and polyphenyl polymethylene isocyanate, so that the carbon fiber is chemically bonded to the polyurethane foam matrix, and the polyurethane foam carbon fiber composite material has compression strength, shrinkage resistance and flame retardant properties.

The present invention relates to a modified fly ash-based mining filling material and a preparation method thereof, wherein the material comprises components such as modified fly ash, lime, cement, gypsum, sodium sulfate and epoxy resin. The dispersibility of fly ash is improved by using a composite modification system of nitrogen-containing silane coupling agent, triethanolamine and organic acid, so that the fly ash is evenly distributed in the slurry; lime, gypsum and sodium sulfate are used as activators, so that the filling material maintains good strength and stability at high temperatures, avoiding the risk of structural damage due to temperature increase; at the same time, the material will not be excessively brittle or have reduced strength under low temperature conditions. In addition, the added epoxy resin can effectively bond materials such as fly ash and cement into a filling body with certain strength and stability due to its excellent bonding properties. The epoxy resin also helps to reduce the internal stress and deformation of the material after curing, ensuring the long-term stability of the filling body. The filling material of the present invention is particularly suitable for mine filling and support operations, and can provide a reliable filling effect under extreme temperature conditions.

The application discloses a kind of low-carbon cementing material by waste incineration fly ash excited ore powder and preparation method thereof, by weight percentage, including the following components: modified waste incineration fly ash 8~12%, ion complex component 1~3%, composite shrinkage component 2~6%, ore powder 55~65%, water 23~28%.Preparation method includes the following steps: S1, preparation modified waste incineration fly ash, ion complex component, composite shrinkage component;S2, modified waste incineration fly ash, ion complex component, composite shrinkage component, ore powder, mixing water, fully mixed and stirred evenly, can obtain the low-carbon cementing material by waste incineration fly ash excited ore powder described in the application.In the aspect of component design, the application is environmentally friendly, low cost, in the performance aspect, the flow rate can be adjusted, the mechanical properties are excellent, the volume shrinkage is small.

The invention relates to a compound for forming a metal-containing film, a composition for forming a metal-containing film, a method for producing a compound for forming a metal-containing film, and a pattern forming method. Provided is a metal-containing compound for forming a film, which has excellent dry etching resistance compared to known organic underlayer film materials and also has a high degree of landfill characteristics and / or a high degree of planarization characteristics. A metal-containing film-forming compound (A) is a metal-containing film-forming compound which is derived from a metal-containing compound obtained by hydrolyzing, condensing, or hydrolytically condensing a metal compound represented by formula (A-1), and which has a ligand derived from an organic compound represented by formula (1). M (OR1A) 4 (A-1), R2ACOXCOOH (1) # imgabs0 #

The invention provides an ultra-light prepreg with a sandwich structure and a preparation and forming process thereof, the ultra-light prepreg with the sandwich structure comprises a first fiber reinforced layer, a thermal self-expansion layer and a second fiber reinforced layer, the thermal self-expansion layer is located between the first fiber reinforced layer and the second fiber reinforced layer, and the thermal self-expansion layer, the first fiber reinforced layer and the second fiber reinforced layer integrally form the sandwich structure in a mold. The method can be used for forming a thin-wall product with the thickness of 0.4 mm-2mm, and is different from a foaming mode of foaming shaping and prepreg sandwich forming of traditional shaped foams such as PVC (polyvinyl chloride) and PMI (polymethacrylimide), so that not only can the forming problem of complex shapes or thin-wall special shapes be solved, but also the delamination phenomenon caused by inconsistent resin systems of a sandwich structure surface layer and a sandwich layer can be improved, and the product quality is improved. And the good performance of the product is ensured. The method can be directly cut into a die for forming, so that the working procedures are reduced, and the production cost is reduced.

The triazine ring-containing polymer of the present invention is, for example, a triazine ring-containing polymer having a repeating unit structure represented by the following formula (24). 102 represents a cross-linking group,

The invention discloses a high-adhesion UV ink and a preparation method thereof. The UV ink comprises the following raw materials in parts by weight: 50-60 parts of a modified resin, 40-50 parts of a modified monomer, 8-10 parts of a color paste and 5-10 parts of a photoinitiator. The modified resin contains a disulfide bond in its molecular structure, which is a dynamic covalent bond. During the curing process of the UV ink, the disulfide bond promotes the rearrangement of a cross-linked network through bond exchange, thereby dissipating the curing shrinkage stress of the system, thereby achieving an effect of increasing adhesion. The modified resin molecule contains a rigid group, which can reduce the double bond density and reduce volume shrinkage by cooperating with a methylphenyl silicone resin molecule of a side chain. The modified monomer contains a plurality of spirocyclic structures, which can generate volume expansion when the UV ink is cured, and the volume shrinkage generated is offset. The modified monomer contains a long-chain alkyl group, which can move into a gap to offset the volume shrinkage generated during light curing, thereby greatly improving the adhesion effect.

The application belongs to the technical field of refractory materials for blast furnace ironmaking, and particularly relates to a thermal shock cracking resistant taphole clay material and a preparation method thereof. The taphole clay material comprises aggregates, matrix powder and a binder system; the binder system is composed of polysilazane, isocyanate curing agent and B4C micropowder. By introducing polysilazane as the main binder, the application realizes high ceramic yield and low volume shrinkage by using the characteristics of polysilazane being converted into Si-B-C-N ceramic at high temperature. Meanwhile, B4C micropowder is oxidized to generate B2O3 at high temperature, which fills pores, promotes sintering and protects carbon phase, so as to realize volume shrinkage compensation and high temperature strength improvement. The taphole clay material has low shrinkage rate, high cold compressive strength, high high-temperature bending strength and excellent thermal shock cracking resistance, and solves the technical problems of poor volume stability and insufficient high-temperature strength of traditional taphole clay caused by binder carbonization shrinkage.

This invention discloses a silicate colloid for high-solids-content, high-modulus composite fire-resistant glass and its preparation method, relating to the field of composite fire-resistant glass technology. Specifically, it describes a silicate colloid for high-solids-content, high-modulus composite fire-resistant glass and its preparation method. The colloid, by weight percentage, comprises a silicon source, water, glycerol / ethylene glycol / polyethylene glycol / polyglycerol, water-soluble organic acids and salts, water-soluble metal oxides or hydroxides, and alkali metal hydroxides, wherein the solids content is 60-75% and the modulus is 4.0-5.5. The preparation method includes: uniformly mixing the silicon source, water, additives, and functional additives, then adding alkali metal hydroxides, reacting at 50-90°C to obtain a prepolymer solution, followed by vacuum degassing. The viscosity is adjusted to the desired range by controlling the reaction conditions. This prepolymer solution is suitable for pouring or coating processes. After curing, the colloid forms a fire-resistant glass core layer. The resulting fire-resistant glass has advantages such as high light transmittance, ultra-thinness, dense foaming, low-temperature resistance, high weather resistance, and long lifespan.

The invention discloses modified halide perovskite and a direct X-ray large-area imaging device and method based on the modified halide perovskite, and belongs to the technical field of halide perovskite preparation. According to the modified halide perovskite disclosed by the invention, the polymer material is added into the target perovskite for modification, the added polymer material such as hydroxy propyl cellulose and carboxymethyl cellulose effectively reduces the volume expansion of the target perovskite, and through the mechanism, the volume expansion of the target perovskite is reduced; due to the introduction of the polymer material, the thermal expansion coefficient of the perovskite layer is effectively reduced, the direct thermal expansion difference between the perovskite layer and the substrate material is reduced, and the residual thermal stress of the modified perovskite material is effectively reduced.

The utility model belongs to the technical field of ceramic badges, and particularly relates to low-shrinkage ceramic and an electronic badge made of the ceramic, the low-shrinkage ceramic comprises a framework layer, a fiber layer and a filler layer, the fiber layer is of a three-dimensional net structure, the framework layer is embedded in meshes of the three-dimensional net structure, and the filler layer is arranged in the framework layer. And the filler layer particles are filled in a gap between the framework layer and the fiber layer. The problems of unstable size, uneven surface and the like of a traditional ceramic electronic badge caused by high shrinkage rate of a ceramic material are effectively solved through the low-shrinkage ceramic, the electronic badge can be accurately formed in the manufacturing process, and the design size and the appearance quality are kept.

The invention relates to an aluminum-silicon alloy, a preparation method and application thereof, and an aluminum-silicon alloy product, the aluminum-silicon alloy comprises the following components by mass: 8.5%-10% of S ; 0.1% to 0.5% of Mg; 0.35% to 0.65% of Mn; 0.1% to 0.2% of Fe; 0.05% to 0.2% of Nb; 0.01% to 0.04% of B; 0.01%-0.02% of Sr, and 0.5%-1% of Ti CN; the total content of other impurities is less than or equal to 0.5%. The aluminum-silicon alloy is good in refining effect and has good tensile strength and yield strength.

The invention relates to a low-temperature crystallization preparation method of a sol-gel metal oxide film, and belongs to the technical field of metal oxide films and sol-gel. Firstly, sol containing metal salt is prepared; then spin-coating the sol on the surface of a clean substrate, standing and curing, and forming an amorphous film on the surface of the substrate; and putting the substrate into a microwave plasma chamber, enabling the amorphous film surface to face upwards, and processing the film by using oxygen plasma to obtain the crystalline metal oxide film. Microwave is selected as an oxygen plasma excitation source, low temperature is kept by adjusting power and pressure intensity, and general preparation of the high-quality metal oxide thin film is achieved by combining the advantages that components of a sol-gel method are adjustable and large-area preparation is easy to achieve.

The invention discloses a method for preparing a whole-body full-ceramic tile by recovering large-particle waste porcelain and a product prepared by the method, the large-particle waste porcelain, potassium feldspar, calcite, magnesite powder, 3 mol% yttrium-stabilized zirconia and a pigment for a green body are used as raw materials, and the whole-body full-ceramic tile is prepared by preparation of a calcined material, preparation of a blank material, vibration compaction molding, drying and calcination. The full-body ceramic tile which is compact in structure, high in mechanical strength and rich in decoration effect is obtained. According to the method, high-efficiency and low-cost recycling of the large-particle waste porcelain is realized, the cost of a ceramic tile product is reduced, and a new way is provided for realizing high-added-value recycling of solid waste.

The invention discloses an evaluation method for silver powder sintering activity, and belongs to the technical field of silver powder performance testing, the method comprises the following steps: putting silver powder into a mold for sintering, taking out a silver material after sintering, immersing the silver material into an oily solution, discharging bubbles, taking out the immersed silver material, and removing the oily solution on the surface of the silver material to obtain a sintered silver sample; the volume shrinkage rate of the sintered silver sample is calculated by utilizing the volumes of the silver powder and the silver sample before and after sintering, and the sintering activity of the silver powder is evaluated by utilizing the volume shrinkage rate. According to the method, the sintering activity of the silver powder is evaluated by measuring the volume shrinkage rate after sintering according to the volume change of the silver powder before and after sintering, the volume shrinkage rate is large, and the sintering activity is high; the method has the advantages of small volume shrinkage, low sintering activity, high efficiency, objectivity and quantifiability.

The invention belongs to the technical field of aerogel composite materials, and provides a polyacrylonitrile-itaconic acid fibrofelt reinforced carbon aerogel composite material as well as a preparation method and application thereof. The preparation method comprises the following steps: impregnating polyacrylonitrile-itaconic acid fiber felt in a pre-polymerization solution composed of a phenol monomer, an aldehyde monomer, an alcohol solvent and an acid catalyst under normal pressure, then carrying out a sol-gel reaction, and sequentially carrying out normal-pressure drying and a carbonization reaction on the obtained composite material precursor, the acidic catalyst comprises one or more of hydrochloric acid, salicylic acid, m-hydroxybenzoic acid and gallic acid. According to the invention, the polyacrylonitrile-itaconic acid fiber felt is used as a reinforcement body, and is impregnated, cured and carbonized in the pre-polymerization solution containing the acid catalyst, so that the prepared carbon aerogel composite material has the advantages of high porosity, low density, high specific surface area, low thermal conductivity and excellent mechanical property and thermal insulation property.