728 results about "Acid catalyzed" patented technology

Provided herein are processes for preparing Compound A or a salt thereof, comprising admixing Compound B or a salt thereof and crotonaldehyde in the presence of an acid catalyst and a solvent to form Compound A

The invention provides a BVPE preparation method based on solid acid catalysis and continuous flow reaction, and relates to the technical field of disubstituted ethane preparation, and the method comprises the following steps: mixing a compound 1, a polymerization inhibitor, a solid acid catalyst and a solvent to form a reaction liquid; enabling the reaction liquid to pass through a fixed bed continuous flow reactor, and reacting at 20-180 DEG C for 1-45 minutes to obtain a compound 2; post-treating, separating and purifying a product; wherein the solid acid catalyst is an HZSM-5 type molecular sieve or acidic resin, the product purity and yield are high, the HZSM-5 type molecular sieve or acidic resin is adopted as the solid acid catalyst, residual pollution of traditional protonic acid (such as p-toluenesulfonic acid) is avoided, in embodiments 1-3, the product GC purity reaches 98.6%-99.1%, the yield reaches 88.8%-93.8%, and the product GC purity and the yield are remarkably higher than those of a contrast (the purity is 96.1%, and the yield is 74.2%).

The invention relates to the technical field of epoxy resin, in particular to self-repairing epoxy resin and a preparation method thereof. The self-repairing epoxy resin is prepared from the following raw materials in parts by mass: 80 to 120 parts of bisphenol A type epoxy resin, 20 to 40 parts of bisphenol F type epoxy resin, 5 to 15 parts of 1, 6-hexanediol diglycidyl ether, 1 to 3 parts of 3, 5-dimethylphenylboronic acid, 1 to 5 parts of furyl maleimide, 10 to 20 parts of dodecanedioic acid, 5 to 15 parts of butanetetracarboxylic acid, 1 to 3 parts of catalyst, 10 to 15 parts of nano silicon dioxide, 1 to 2 parts of boron nitride nanosheet and 1 to 2 parts of hyperbranched polyamidoamine. The curing agent is prepared from the following components in parts by weight: 20-30 parts of epoxy resin, 1-2 parts of sulfydryl-terminated polysiloxane, 20-30 parts of amine curing agent, 5-15 parts of reinforcing filler and 0.5 According to the invention, the balance among self-repairing capability, mechanical property and heat resistance is successfully realized; in the microcrack propagation process, fracture and recombination mechanisms of dynamic covalent bonds effectively prevent further propagation of cracks.

The invention provides a preparation method of a block poly (biphenyl-trifluoroacetophenone-piperidone) bicontinuous hollow fiber loose nanofiltration membrane, which comprises the following steps: adding acid into biphenyl and N-methyl-4-piperidone to react to obtain a first product; adding acid into biphenyl and 2, 2, 2-trifluoroacetophenone to react, so as to obtain a second product; adding the second product into the first product, and carrying out condensation polymerization to obtain a PBTbBP block polymer; dissolving the PBTbBP block polymer in a solvent, and defoaming to obtain a membrane casting solution; spinning the membrane casting solution and the core solution to obtain membrane filaments; and immersing the membrane filaments in a coagulating bath, and carrying out phase separation. According to the preparation method, biphenyl, a hydrophobic trifluoroacetophenone monomer and a hydrophilic N-methyl piperidone monomer are subjected to superacid catalysis Friedel-Crafts reaction and are subjected to step-by-step copolymerization to obtain the amphiphilic block polymer PBTbBP. The membrane has efficient mass transfer channels and excellent membrane surface hydrophilicity, and the separation capacity of dye molecules and salt ions and the water permeability are improved.

The invention belongs to the technical field of high polymer material synthesis, and particularly relates to an artificial antioxidant enzyme material with an interlayer structure and a preparation method of the artificial antioxidant enzyme material. The preparation method of the artificial antioxidant enzyme material comprises the following steps: dissolving an aldehyde monomer and an amine monomer in a reaction solvent, performing thermal polymerization under the action of an acid catalyst, and then loading interlayer coordination metal, and further defining an aldehyde monomer and an amine monomer as well as an interlayer coordination metal. According to the present invention, the treatment-level oxidation resistance can be achieved through the space-optimized catalysis center and the fully-conjugated frame structure, and the innovative strategy is provided for solving the inflammation-driven tissue damage through the precise oxidation-reduction regulation and the immune microenvironment engineering.

Provided is method for producing a glycoside in which a phenolic compound is bonded to an anomeric position of a sugar, the method including: a step (1) of reacting a peracetylated sugar with the phenolic compound in the presence of an acid catalyst; and a step (2) of directly adding a deacetylating agent and a deacetylating solvent selected from the group consisting of water and an alcohol to a reaction mixture obtained in the step (1) to perform a deacetylation reaction.

The invention relates to the technical field of heat energy storage materials, and particularly provides a silicon dioxide aerogel composite phase change heat storage material and a preparation method thereof. The method comprises the following steps: mixing an organic silicon source, absolute ethyl alcohol and deionized water according to a specific ratio, fully stirring to obtain a mixed solution, and dropwise adding an acid catalyst into the mixed solution at room temperature for hydrolysis reaction to obtain a hydrolysate; sequentially adding a drying control agent and an alkali catalyst, and standing for gelation reaction to obtain gel; adding an organic solvent to carry out aging reaction, and then adopting the organic solvent to carry out replacement for multiple times to obtain alcogel; replacing the alcohol gel with an organic solvent for multiple times to obtain wet gel, soaking the wet gel in an excessive molten phase change material, and carrying out normal-pressure solvent replacement and drying at 40 DEG C to obtain the phase change material, the loading capacity of octadecane in the obtained CPCM is about 83%, the phase change enthalpy reaches up to 192J / g, the heat conductivity is as low as 0.0812 W / m.K, and no obvious leakage occurs after 200 times of circulation.

Disclosed are a preparation method for a SiO2 aerogel and a SiO2 aerogel, and belongs to the technical field of chemical coatings. The preparation method for the SiO2 aerogel comprises the following steps: S100: uniformly mixing an inorganic silicon source, water, a surfactant and an acid catalyst, and gelating the mixture to obtain a wet gel; S200: uniformly mixing a surfactant, a cosolvent and a low-surface-tension solvent to obtain a reverse micelle extraction solution; S300: mixing the wet gel obtained in the step S100 with the reverse micelle extraction solution obtained in the step S200, and soaking the mixture to obtain a gel; and S400: drying the gel obtained in the step S300 to obtain the SiO2 aerogel.

The invention discloses a low-cost high-first-effect micron silicon negative electrode material and a preparation method and application thereof. The preparation method comprises the following steps: treating the surface of micron silicon by adopting an oxidant solution to form a silicon dioxide passivation layer, and then carrying out surface modification by using a silane coupling agent; the method comprises the following steps: performing acid-base alternate soaking treatment on a biomass carbon source to reduce the content of metal impurities; mixing the delimed biomass carbon source, the composite carbon source and the pretreated micron silicon, firstly adding a weak acid catalyst for hydrothermal reaction to form a hard carbon inner layer, then adding a weak base catalyst for regulating the pH value of the system to alkalescence in batches, and continuing hydrothermal reaction to form a soft carbon outer layer; and washing and drying the product, and carrying out carbonization treatment in an inert atmosphere to obtain the composite coated micron silicon material. The first efficiency of the material is greater than or equal to 92%, the 1C 1000-time circulation capacity retention ratio is greater than or equal to 82%, the raw material cost is low, the process is simple, and the material is suitable for lithium ion batteries in the fields of power, energy storage and consumer electronics.

The invention relates to the technical field of adhesives, and provides a high-thermal-conductivity modified silane polyether adhesive and a preparation method thereof.The silane-terminated polyether sealant is prepared from silane modified polyether resin, modified filler, a flame retardant, a silane coupling agent, a catalyst, an antioxidant and a water removal agent; the modified filler is obtained by grafting a hydroxylated AlN filler or a hydroxylated BN filler or a hydroxylated AlN and hydroxylated BN compound filler with silane under the catalysis of a weak acid to form a Si-O-Al or / and Si-O-B covalent bond network, and then mixing the Si-O-Al or / and Si-O-B covalent bond network with nano silicon dioxide particles of which the surfaces are coated with polydopamine. Through a multi-dimensional filler modification technology and reasonable matching of other auxiliaries, the problem of synergism of heat conduction, flame retardance and mechanical properties of the MS adhesive under a high filling system is solved, and the material is suitable for a new energy power battery module.

The invention belongs to the technical field of organic synthesis, and relates to a preparation method of 5, 5-dimethyl-4, 5-dihydroisoxazole. The method comprises the following steps: (1) reacting isopentenal with an oximation agent to obtain a reaction solution containing isopentenal oxime; (2) dropwise adding the reaction liquid into a mixture containing isopentenal and an acid catalyst for reaction to obtain a product; or when the reaction liquid contains water, performing phase splitting on the reaction liquid to obtain an organic phase, and dropwise adding the organic phase into a mixture containing the isopentenal and the acid catalyst for reaction to obtain a product. The method does not produce ketone by-products, and is good in atom economy, high in reaction yield, good in technological process continuity, low in cost, few in materials, simple to operate, mild in reaction condition, low in requirements on production equipment and suitable for large-scale industrial production.

This invention discloses a patterned solar glass with a neutral colour anti- reflection coating (ARC) designed to enhance light transmission and optical performance The dual-side structured glass features a smoother side coated with a two-layer anti-reflection coating. The bottom layer is formulated from a silane precursor, a hydrolyzing agent, an acid catalyst, porosity-enhancing agents, and a combination of solvents, achieving a refractive index of 1.4 to 1.5. The top layer is a nano-composite-based AR coating with a refractive index of 1.25 to 1.35 is applied on the bottom layer. The layers are chemically bonded via a roll-coating process, with precise thickness control wherein, the bottom layer ranges from 180–210 nm and the top layer ranges from 140–160 nm. This gradient refractive index structure results in a transmission gain of 2.3% and minimizing Fresnel reflection losses. The coating ensures neutral colour appearance and uniform light transmission, improving omnidirectional performance under varying light angles.

The invention belongs to the technical field of carbon dioxide trapping, and particularly relates to a carbon dioxide trapping system and a carbon dioxide trapping method. Compared with a traditional thermal desorption method, the carbon dioxide trapping system based on external microwave field assisted absorbent catalytic desorption has the advantage that the microwave desorption method has higher energy utilization efficiency. The random packing catalyst has an acid catalysis function, so that the desorption amount and the carbon removal rate of the absorbent can be further improved, and the random packing catalyst has a microwave absorption function, so that heat and mass transfer in the desorption process is enhanced in a hot spot form, and the utilization of microwaves is further improved. The desorption efficiency of 60-80% can be achieved below 102 DEG C, the CO2 desorption rate is far higher than that of a traditional thermal desorption method, and latent heat consumed by water evaporation in the desorption process is remarkably reduced. Meanwhile, the CO2 removal efficiency of the absorption tower is improved, and the cost of the whole carbon capture process can be remarkably reduced.

The invention discloses a preparation method of a sulfonic acid type covalent organic framework material and a preparation method of 5-hydroxymethylfurfural. The material is prepared by carrying out covalent condensation reaction on a monomer containing a sulfonic acid group precursor and a connecting ligand of a skeleton through a hot solvent method, and the catalyst has the characteristics of high crystallinity, large specific surface area, ordered pore structure, high sulfonic acid group density and uniform distribution. The preparation method is simple, convenient, efficient, mild in condition and high in yield. Compared with a traditional lewis acid catalyst for preparing 5-hydroxymethylfurfural through fructose dehydration, the material has the advantages of being uniform and adjustable in porosity, higher in active site, capable of promoting fructose hydrolysis and the like, efficient conversion can be achieved, side reactions and product transition polymerization are inhibited, and better industrialization prospects are shown.

The invention belongs to the technical field of organic matter preparation, and particularly relates to a preparation method of 2-pentylcyclopentyl-2-ketene. According to the method, methanol is used as a solvent, sulfonic acid type resin doped with lewis acid is used as a catalyst to catalyze the isomerization reaction of 2-pentylidene cyclopentanone, the catalyst and the methanol solvent can jointly promote the isomerization reaction of 2-pentylidene cyclopentanone, and the catalytic efficiency is high, so that the reaction yield is remarkably increased, and the catalyst cost is reduced; in addition, a fixed bed reactor continuous production mode is adopted, waste salt is prevented from being generated when the acid catalyst is quenched by processes such as HCl / HBr / p-toluenesulfonic acid, and methanol is used as a solvent, so that the byproduct dimethyl ether is simply separated from water and the solvent methanol. In addition, when the sulfonic acid type resin doped with the lewis acid is used for catalyzing the isomerization reaction of 2-pentylidene cyclopentanone, the stability is high, and the service life is long.

A composition and method can be used in the preparation of various siloxanes. The composition and method employ a fluorinated triarylborane Lewis acid, a hydrocarbonoxy-functional organosilicon compound, and a silyl hydride. The fluorinated triarylborane Lewis acid catalyzes reaction of a hydrocarbonoxy moiety (from the organosilicon compound) and a silicon-bonded hydrogen atom (from the silyl hydride) to form a siloxane bond.

The invention provides a solid acid catalyst and application thereof in esterification reaction of polyethoxy dihydric alcohol and acrylic acid, and relates to the technical field of preparation of polyethylene glycol diacrylate. The solid acid catalyst is a UIO-66-SO3H catalyst based on a UIO-66 framework, the catalyst is prepared from ZrCl4, formic acid, terephthalic acid and 2-sulfonic acid terephthalic acid through a reaction, the catalyst can catalyze an esterification reaction of polyethyoxyl dihydric alcohol and acrylic acid under the solvent-free condition, a subsequent desolventizing step is avoided, energy consumption is reduced, and the method is suitable for industrial production. And the prepared polyethoxy glycol diacrylate product is colorless and transparent in color, high in purity, low in polymerization degree, moderate in viscosity and wider in application space.

The invention relates to a method for preparing bio-based isosorbide dimethyl ether through resin catalysis, and belongs to the technical field of organic synthesis. Adding corn starch into a sulfuric acid solution, hydrolyzing into glucose, and filtering to obtain a glucose solution; adding a solid acid catalyst into the concentrated glucose solution, and filtering after reaction; carrying out reduced pressure distillation on the filtrate to obtain an isosorbide crude product, and purifying through recrystallization; the preparation method comprises the following steps: adding isosorbide, a methylation reagent and a basic catalyst into a reaction kettle, stirring for reaction, cooling and filtering; and distilling the filtrate, and collecting fractions to obtain high-purity isosorbide dimethyl ether. The solid acid catalyst is sorbic acid based styryl macroporous cation exchange resin; the styryl macroporous cation exchange resin is soaked in sulfuric acid to be activated and then is mixed with sorbic acid chloride, 2-thiophenecarbonyl chloride and zinc chloride to react, and then washing and drying are performed to prepare the solid acid catalyst; the isosorbide dimethyl ether prepared by the method disclosed by the invention is high in purity and relatively high in yield.

The invention relates to the technical field of catalysis, and particularly discloses a method for preparing pure biodiesel from kitchen waste oil through enzyme catalytic desulfurization. The method comprises the following steps: adding a Sm2O3 / ZrO2 solid acid catalyst into the kitchen waste oil for pretreatment to obtain pretreated waste oil, and then adding lipase into the pretreated waste oil for catalyzing transesterification to obtain the biodiesel. According to the method for preparing the pure biodiesel from the kitchen waste oil through enzyme catalytic desulfurization, in-situ esterification and synchronous desulfurization of free fatty acid can be completed in a single-step reaction, the stability of a conversion reaction is effectively improved, the production process is simplified, and the conversion efficiency of preparing the biodiesel from the kitchen waste oil is improved.

The invention discloses a ketoazine-based polymer, an anion exchange membrane and a preparation method and application of the ketoazine-based polymer and the anion exchange membrane. A first linking group and a second linking group are mixed and then mixed with an aryl monomer A in an aprotic solvent of halogen atoms; slowly adding a super acid mixture; performing polymerization reaction in an environment of-5 to 3 DEG C to obtain a reaction solution; pouring the reaction liquid into a first mixed solvent to obtain PAAz; carrying out primary quaternization reaction on PAAz through carbonate, bicarbonate or hydroxide salt of alkali metal, and adding an organic base catalyst to assist the primary quaternization reaction; in the first quaternization reaction, a quaternization reagent is added; and pouring into a second mixed solvent, and precipitating to obtain purified PAAz. Under the condition of super acid catalysis, two or more alicyclic amine derivatives containing ketone groups react with one or more aromatic fused rings to generate a polymer containing secondary or tertiary amine. And carrying out quaternization treatment to finally form the cationic polymer.

The invention discloses a preparation method of active nano silicone rubber core-shell particle pre-dispersion liquid. The preparation method comprises the following steps: pre-emulsifying an organic silicon monomer, a silane coupling agent and a vinyl silane coupling agent, then carrying out hydrolytic polycondensation under the condition of an acid catalyst, synthesizing a nano silicon rubber core particle emulsion, taking the nano silicon rubber core particle emulsion as a seed, dropwise adding a double-bond-containing pre-emulsion under the condition of the catalyst, grafting a double-bond-containing monomer shell through the vinyl silane coupling agent, and carrying out vacuum drying to obtain the nano silicon rubber core particle emulsion. The preparation method comprises the following steps: preparing a nano silicone rubber core-shell particle emulsion, taking the nano silicone rubber core-shell particle emulsion as a seed, dropwise adding a functional monomer pre-emulsion, grafting a reactive group shell to obtain an active nano silicone rubber multi-layer core-shell particle emulsion, carrying out spray drying on the emulsion, and uniformly dispersing the emulsion in epoxy resin in a melt blending manner to prepare an active nano silicone rubber core-shell particle pre-dispersion liquid. The pre-dispersion liquid prepared by the invention has the characteristics of good UV light permeability, toughness, heat resistance, electrical performance and the like, so that the pre-dispersion liquid has good application value in the fields of 3D printing, electronics, aerospace and the like.

The invention discloses 1K varnish as well as a preparation method and a spraying method thereof, relates to the technical field of automobile coating varnish, and solves the problems that the existing 1K varnish is difficult to be matched with a water-based colored paint system and is poor in performance. Comprising acrylic polyol, a thermosetting hydroxylated acrylic copolymer solution, thermosetting hydroxylated acrylic resin, polycarbonate diol, amino resin, blocked isocyanate resin, a leveling agent, a catalyst, an aging aid, a wetting dispersant and a solvent. The amino resin comprises butylated amino resin and a trifunctional melamine cross-linking agent; bYK306 and BYK358N are used as the flatting agents; the catalyst comprises an acid catalyst and a metal catalyst; the aging auxiliary agent comprises an ultraviolet light absorber 80 and a light stabilizer uv-93; the wetting dispersant is BYK-161; the solvent is prepared from butyl acetate, DBE, ethyl ethoxypropionate, ethylene glycol butyl ether acetate and n-butyl alcohol. The method is suitable for being matched with a water-based production line and is wide in applicability.

This invention relates to the field of chemical synthesis technology and discloses a method for preparing 2,5-furandicarboxylic acid from fructose, comprising the following steps: preparing reaction system A containing fructose, an organic bromide, a solid acid catalyst, and water; performing a dehydration reaction to separate the solid acid catalyst and obtain a fructose dehydration reaction solution; preparing reaction system B containing the fructose dehydration reaction solution, a co-oxidant, an oxidation catalyst, and acetic acid; performing an oxidation reaction under an oxidizing gas atmosphere; separating the product to obtain 2,5-furandicarboxylic acid. This invention utilizes a co-oxidant, which can reduce the requirement for fructose concentration in the one-pot preparation of 2,5-furandicarboxylic acid while ensuring the yield and purity of FDCA, thereby improving production efficiency. Furthermore, it reduces or even eliminates the use of hydrobromic acid in the oxidation reaction, thus reducing corrosion to equipment.

The invention relates to a new and improved process for making an epoxidized olefin, specifically, polyisobutylene epoxide. The inventive process generally comprises (a) combining a polyisobutylene and a solvent to form a first mixture, (b) combining a peroxide, a carboxylic acid and an acid catalyst to form a second mixture, (c) reacting the first and second mixtures forming a non-aqueous phase comprising a polyisobutylene epoxide and an aqueous phase; (d) separating the non-aqueous phase from the aqueous phase; (d) washing and neutralizing the non-aqueous phase, and (e) recovering in a high yield and high purity polyisobutylene epoxide. It was discovered that specific mole ratios and amounts of reactants provide for recovering in high yield and purity polyisobutylene epoxide with reduced detrimental by-products.

The invention discloses a method for synthesizing polyvinyl acetal with high acetalization rate by using acid with catalytic property and dispersity, and relates to the technical field of synthetic resin. The method comprises the following steps: dissolving polyvinyl alcohol in water to obtain a polyvinyl alcohol solution; adding a p-toluenesulfonic acid solution into the polyvinyl alcohol solution, then adding an aldehyde compound at the temperature of 25-30 DEG C, and after the aldehyde compound is added, continuing to react at the temperature of 25-30 DEG C to obtain the high-acetalization-rate polyvinyl acetal. According to the invention, p-toluenesulfonic acid is used as an acid catalyst and a dispersant at the same time, and preparation of the high-acetalization-rate polyvinyl acetal is realized under the condition of not adding any other surfactant or organic dispersant. The method not only realizes the preparation of the high-acetalization-rate polyvinyl acetal product, but also has the advantages of low preparation cost, simplicity in product separation and purification, recyclability of p-toluenesulfonic acid and the like.

The invention relates to the technical field of coatings, and discloses a modified aerogel, a preparation method thereof and an application of the modified aerogel in a radiation refrigeration coating. The method comprises the following steps: in the presence of water, a solubilizer and an acid catalyst, carrying out hydrolysis reaction on a silicon source to obtain silica sol; in the presence of a base catalyst, contacting the silica sol with a rare earth oxide with a linear average particle size of 10-100 nm to carry out a gel reaction so as to obtain a modified wet gel; and drying the modified wet gel at normal pressure to obtain the modified aerogel, the adding amount of the rare earth oxide and the normal-pressure drying condition are controlled, so that the content of the rare earth oxide in the modified aerogel is 0.5-1 wt%. A coating prepared from the radiation refrigeration composition containing the modified aerogel prepared by the invention has the characteristics of high sunlight reflectivity, high atmospheric window emissivity and the like.

The invention provides a preparation method of a cellulose-based high-conductivity porous carbon material, and belongs to the technical field of carbon material preparation. The preparation method comprises the following steps: mixing a cellulose raw material with an acid catalyst, carrying out a stirring reaction at 40-60 DEG C, then heating to 80-120 DEG C, and carrying out a reaction to obtain a cross-linked product; washing, drying and carbonizing the cross-linked product; and carrying out graphitization treatment on the carbonized product to obtain the product. According to the method, traditional high-temperature carbonization is replaced with acid catalysis gradient dehydration, energy consumption is reduced, the structure of the precursor is regulated and controlled, then in-situ pore forming and nitrogen doping are carried out, a strong-corrosivity activating agent is avoided, the conductivity and porosity are improved, and the technical breakthrough of green and efficient preparation of the high-performance carbon material is achieved.

The present invention belongs to the field of functional resins and specifically relates to a lignin-modified dicyclopentadiene phenol resin and a preparation method thereof. The present invention utilizes phenol to phenolate bamboo lignin under alkaline conditions, and then uses methanesulfonic acid to catalyze the reaction of the phenolated bamboo lignin, phenol, and dicyclopentadiene to prepare the dicyclopentadiene phenol resin. This reduces the amount of phenol used in the dicyclopentadiene phenol resin and improves its heat resistance, corrosion resistance, and other properties, resulting in high bonding strength, friction resistance, and electrical insulation. Furthermore, the preparation method is simple, the reaction conditions are mild, and the production cost is low, meeting the environmental protection needs of modern society while also adhering to the principles of green chemistry and chemical atom economy.

This invention relates to the field of oil and fat synthesis technology, specifically to a method for preparing nervonic acid monoglyceride. In this invention, nervonic acid and glycerol are used as raw materials, and an esterification reaction is carried out under microwave assistance to obtain a first mixture containing nervonic acid monoglyceride, nervonic acid diglyceride, nervonic acid triglyceride, unreacted nervonic acid and glycerol, and a catalyst. Glycerol and the catalyst are removed by ethyl acetate extraction to obtain a second mixture. Subsequently, taking advantage of the temperature-sensitive nature of nervonic acid monoglyceride in edible oils, it is separated and purified to obtain nervonic acid monoglyceride. The esterification reaction under microwave assistance not only avoids the corrosion and contamination problems caused by traditional acid catalysts, but also significantly shortens the esterification reaction time, improves synthesis efficiency, and effectively inhibits the isomerization of cis-nervonic acid during the reaction, ensuring the stability of the product configuration.

The invention provides a preparation method of ultra-low thermal conductivity silicon-based aerogel, and relates to the field of aerogel material preparation, and the preparation method comprises the following steps: S1, preparing a component A and a component B. The component A is prepared by fully mixing a silicon source, a modified silicon dioxide seed crystal, absolute ethyl alcohol and deionized water, then slowly adding an acid catalyst, and carrying out hydrolysis; the component B is a basic catalyst solution obtained by uniformly mixing deionized water and stronger ammonia water; step S2, gelling: fully mixing the component A and the component B to obtain wet gel, and then mixing the wet gel with a fiber felt to obtain a wet gel felt; step S3, aging; and S4, performing supercritical drying. According to the method, by introducing the modified silicon dioxide seed crystal, the thermal conductivity of a solid structure of the aerogel is effectively reduced, meanwhile, formation of macropores, communicating pores and the like is inhibited, and the performance of the aerogel is improved.