86 results about "Orthosilicate" patented technology

The invention belongs to the technical field of building materials, and particularly relates to a building thermal insulation aerogel material and a preparation method, the aerogel material comprises the following components by mass: 25-35 parts of a silicon source, 40-80 parts of a solvent, 0.3-0.6 part of a catalyst, 4-13 parts of an aluminum source, 9-20 parts of reinforcing fibers, 4-10 parts of a modifier, and 20-40 parts of carrier fibers; the silicon source is ethyl orthosilicate or methyl trimethoxy silane; the solvent is absolute ethyl alcohol; the catalyst is hydrochloric acid or ammonia water; the aluminum source is aluminum nitrate nonahydrate or aluminum isopropoxide; the reinforced fibers are nano titanium dioxide fibers; the modifying agent is gamma-aminopropyl triethoxy silane or gamma-methacryloyloxy propyl trimethoxy silane, and the modifying agent is gamma-aminopropyl triethoxy silane or gamma-methacryloyloxy propyl trimethoxy silane; the carrier fiber is rock wool or mineral wool. According to the invention, the thermal insulation aerogel material for buildings, which is high in mechanical strength, good in weather resistance and excellent in thermal insulation performance, can be prepared, so that the requirements of the building industry on high-performance thermal insulation materials can be met.

The invention relates to a continuous production method of high-purity tetraethoxysilane, and belongs to the technical field of tetraethoxysilane preparation. The method comprises a raw material pretreatment stage and a purification and rectification stage: in the pretreatment stage, silicon tetrachloride and ethanol are subjected to an esterification reaction in a molar ratio of 1: (3-4) under the protection of nitrogen, the pH is adjusted to be neutral through triethylamine, and triethylamine hydrochloride is removed through reduced pressure distillation; then, a cerium oxide-molecular sieve composite adsorbent with the specific surface area larger than or equal to 800 m / g and the pore diameter of 2-5 nm is adopted for dehydration under the pressure of 0.8-1.2 MPa till the water content is smaller than or equal to 5 ppm, and volatile impurities are removed through high-purity nitrogen purging; in the purification stage, metal ions and Cl are synergistically removed through a titanate modified resin layer and a nano TiOtube layer, and then step-by-step separation is performed through a four-stage differential pressure rectifying tower. Through collaborative optimization of structural design of the composite adsorbent, construction of an organic-inorganic hybrid interface of the resin layer and pressure gradient rectification, 72-hour continuous production is achieved, the single-pass yield of the product is 92%, and the total amount of metal impurities is smaller than or equal to 5 ppb.

A magnetic nanoparticle composite microcapsule, and a preparation method therefor and the use thereof. The preparation method comprises: diluting concentrated ammonia water with absolute ethanol in which nano-Fe3O4 is dispersed, stirring same and adding ethyl orthosilicate, centrifuging same, and then performing washing to obtain Fe3O4 / SiO2 particles; dispersing same in anhydrous ethanol, then adding isopropanol containing tetrabutyl titanate, and performing a treatment to obtain Fe3O4 / SiO2 / TiO2 nanoparticles; adding polyurethane TDI prepolymer to the Fe3O4 / SiO2 / TiO2 nanoparticles, adding same to a core material, then dripping an emulsifier, and stirring same to obtain a core material emulsion; and heating same in a water bath, dropwise adding butanediol, and performing heating, stirring and vacuum filtration to obtain a magnetic nanoparticle composite microcapsule. By means of the loading with a core material having a repair function, the prepared magnetic microcapsule can actively repair damage to an insulating material caused by electrical and mechanical stress, thereby improving the reliability of a device.

The invention belongs to the technical field of concrete admixtures, and particularly relates to a new and old concrete dry powder heat-resistant interface treating agent and application. The interface treating agent is prepared from the following raw materials in parts by weight: 100 parts of cement, 100 to 125 parts of quartz sand, 20 to 30 parts of mineral admixture, 5 to 8 parts of organic-inorganic hybrid phase change microcapsules, 1.5 to 3 parts of carboxymethyl chitosan powder, 0.1 to 0.2 part of early strength agent and 0.05 to 0.1 part of water reducing agent, the preparation method of the organic-inorganic hybrid phase change microcapsule comprises the following steps: preparing a precursor solution from alkyl orthosilicate, an ether-containing silane coupling agent, alcohol, water and ammonia water; preparing an emulsion from paraffin, a surfactant and water; under the conditions of temperature control and stirring, the precursor solution is dropped into the emulsion for reaction, and the organic-inorganic hybrid phase change microcapsule is obtained. The organic-inorganic hybrid phase change microcapsule can adjust the temperature, delay the sudden rise of the temperature at the interface, reduce the peak temperature, reduce the temperature difference, buffer the thermal expansion and cold contraction, and reduce the cracking caused by thermal stress.

The invention discloses a composite fluorine removal agent and a preparation method thereof, and belongs to the technical field of water treatment. The preparation method of the composite fluorine removal agent comprises the following steps: dipping biomass charcoal in a lanthanum-containing solution, and calcining to obtain a La2O3 / charcoal carrier; the La2O3 / carbon carrier, nano-hydroxyapatite, MgO and magnetic Fe3O4 particles are mixed and then subjected to heat treatment, and a composite material is obtained; mixing the composite material, tetraethoxysilane and a solvent, dropwise adding ammonia water into the mixture for catalytic hydrolysis, and then annealing to obtain a SiO2-coated composite material; and mixing and granulating the SiO2 coated composite material and a binder, and then activating to obtain the composite fluorine removal agent. The method realizes the preparation of the composite fluorine removal agent which is wide in pH application range, can be recycled and can be suitable for efficient treatment of low-concentration fluorine wastewater.

The invention provides a dark metal modified lithium orthosilicate-based thermochemical heat storage material as well as a preparation method and application thereof, and belongs to the technical field of energy and material science. The components of the heat storage material comprise lithium orthosilicate and dark metal, the proportion of the dark metal in the heat storage material is 2-10 mol%, and the source of the dark metal comprises one or more of manganese dioxide, ferric oxide, nickel oxide and copper oxide. Metal ions introduced into the obtained dark metal modified lithium orthosilicate-based thermochemical heat storage material have the effects of promoting the ion migration rate and resisting material sintering, and specifically, the heat storage density and the cycling stability of the material are remarkably enhanced. In addition, due to the introduction of the dark metal oxide, the color of the heat storage material is remarkably deepened, the solar spectrum absorptivity is greatly improved, the light absorption performance of the material is greatly enhanced, and the heat storage material has higher photo-thermal conversion efficiency and is more suitable for a concentrating solar energy storage system.

The invention relates to the technical field of ceramic antifouling agents, and mainly relates to a high-hardness wear-resistant matte ceramic antifouling agent and a preparation method thereof. The high-hardness wear-resistant matte ceramic antifouling agent is prepared from the following raw materials in parts by weight: 50 to 60 parts of waterborne acrylic resin, 3 to 5 parts of tetraethoxysilane, 0.5 to 1.5 parts of citric acid, 0.1 to 0.5 part of a catalyst, 0.5 to 3 parts of fluorine-containing acrylate, 1 to 10 parts of polymethyl methacrylate microspheres, 20 to 30 parts of water, 1 to 5 parts of titanium dioxide sol and 1 to 5 parts of organic silicon modified polyvinyl alcohol. The organic silicon modified polyvinyl alcohol is obtained by carrying out modification treatment on polyvinyl alcohol by using KH-570. The high-hardness wear-resistant matte ceramic antifouling agent provided by the invention can be used for carrying out good antifouling treatment on the ceramic surface and enhancing the wear resistance.

The invention belongs to the technical field of rock wool thermal insulation materials, and particularly relates to a high-strength thermal insulation rock wool board and a preparation method thereof. The high-strength thermal insulation rock wool board is prepared from the following raw materials in parts by weight: 65 to 72 parts of basalt, 10 to 15 parts of dolomite, 8 to 12 parts of iron ore, 3 to 8 parts of bauxite, 2 to 5 parts of limestone, 10 to 15 parts of aerogel powder and 4 to 7 parts of binder. The aerogel powder is prepared by the following preparation processes: mixing tetraethoxysilane, ethanol and water, adjusting the pH value to 2.5-4, and stirring under a heating condition to obtain silicon dioxide sol; the preparation method comprises the following steps: dispersing black phosphorene in water to obtain black phosphorene dispersion liquid; and mixing a black phosphorene dispersion liquid with the silicon dioxide sol to form a mixed solution, adjusting the pH value of the mixed solution to 8-10, standing, aging, freeze-drying and grinding to obtain the aerogel powder. The high-strength heat-preservation rock wool board has the advantages of low heat conductivity, low water absorption and excellent mechanical strength.

The invention discloses a three-dimensional porous hard carbon coated silicate positive electrode material and a preparation method thereof, belongs to the field of novel energy materials, and relates to a three-dimensional porous hard carbon coated silicate positive electrode material and a preparation method thereof. The preparation method comprises the following steps: taking carbon nanotubes and chitosan as a carbon skeleton, mixing in an acidic solution, adding ethyl orthosilicate into ethanol, adding corresponding metal ion salts, dissolving and mixing, carrying out two-stage calcination at a certain temperature to obtain a three-dimensional porous hard carbon coated silicate positive electrode material, pulping the obtained material, coating a foil material with the pulped material, and drying to obtain the three-dimensional porous hard carbon coated silicate positive electrode material. And finally assembling to obtain the battery. The prepared silicate positive electrode material has good conductivity and discharge stability.

The application provides a modified hollow porous silica microsphere and a preparation method and application thereof. The preparation method of the modified hollow porous silica microsphere comprises the following steps: S1, mixing a pre-hydrolysis solution of orthosilicate, a pre-hydrolysis solution of alkyl trialkoxysilane, a pre-hydrolysis solution of 1,2-bis(trialkoxysilyl)ethane and a polyol to obtain a mixture, refluxing, removing alcohol and obtaining a prepolymer; S2, mixing the prepolymer obtained in the step S1 with water, emulsifying, adjusting pH to alkaline, aging, filtering and drying, and the modified hollow porous silica microsphere is obtained. The application uses 1,2-bis(trialkoxysilyl)ethane as one of main silicon sources, and uses the mode of pre-hydrolyzing different silanes separately and then mixing and condensing, so that the highly hydrolyzable and polymerizable silane is prevented from being highly hydrolyzed and polymerized and the non-hydrolyzable and polymerizable silane is prevented from being hydrolyzed and polymerized, the preparation process is simple, the raw material cost is low, the porous microspheres obtained have good morphology and high yield, the operation condition is mild, and the application is easy to industrialize.

The invention discloses a FeNi soft magnetic composite material based on tetrabutyl orthosilicate hydrolysis coating and a preparation method of the FeNi soft magnetic composite material. According to the method, through a controllable sol-gel process, tetrabutyl orthosilicate is hydrolyzed to generate SiO2 gel, then a uniform and ultrathin SiO2 gel layer is generated on the surface of FeNi powder in situ, and then heat treatment densification is performed to obtain the FeNi soft magnetic composite material coated with SiO2 in an insulation mode. The SiO2 insulating layer is firmly combined with the matrix metal powder, the thermal stability is good, high frequency and high resistivity are achieved, and meanwhile dilution of non-magnetic relative magnetic performance is reduced to a great extent. The final magnetic core is obtained through compression molding and annealing heat treatment, has the excellent characteristics of high effective magnetic conductivity and low high-frequency magnetic core loss, and is particularly suitable for various efficient and miniaturized power electronic devices in the MHz frequency band.

A rhombohedral Zn2SiO4 / cubic ZnFe2O4 / hexagonal SiO2 / C nanocomposite material includes a rhombohedral zinc orthosilicate (Zn2SiO4) phase, a cubic zinc ferrite (ZnFe2O4) phase, and a hexagonal silicon dioxide (SiO2) phase. The rhombohedral Zn2SiO4 / cubic ZnFe2O4 / hexagonal SiO2 / C nanocomposite material exhibits a morphology including spherical microscale particles with an average diameter ranging from 0.8 micrometer (μm) to 1.8 μm and irregular nanoscale aggregates with an average diameter ranging from 50 nanometer (nm) to 110 nm. The rhombohedral Zn2SiO4 / cubic ZnFe2O4 / hexagonal SiO2 / C nanocomposite material has an adsorption capacity for basic fuchsin dye of greater than or equal to 140 milligrams per gram (mg / g). Furthermore, a method for producing the rhombohedral Zn2SiO4 / cubic ZnFe2O4 / hexagonal SiO2 / C nanocomposite material includes calcination of metal precursors.

The application belongs to the technical field of three-proofing glue and specifically relates to three-proofing glue comprising double-cured resin and a preparation method and application thereof. The three-proofing glue comprises, by mass fraction, 35-55 parts of siloxane-modified acrylate oligomer, 5-15 parts of di-functional group hydroxyl-containing polyurethane acrylate resin, 30-60 parts of active diluent and 1-5 parts of photoinitiator. The siloxane-modified acrylate oligomer is obtained by reacting side-chain fluorine-containing epoxy-terminated polysiloxane and acrylic acid to obtain prepolymer A and then reacting the prepolymer A with methyl orthosilicate. The three-proofing glue has excellent adhesion, neutral salt spray resistance, ammonium chloride solution resistance, sodium carbonate solution resistance and mixed gas resistance and can be used for protecting circuit boards and electronic equipment in a chemical plant environment.

The invention discloses a nano-composite cement reinforcing agent with a gradient slow release function and a preparation method thereof, alcohol amine molecules are protonized and stably adsorbed in an interlayer domain of montmorillonite by utilizing an ion exchange effect, and then a multi-component orthosilicate mixed system with different hydrolysis characteristics is adopted to prepare the nano-composite cement reinforcing agent with the gradient slow release function. And carrying out in-situ sol-gel reaction at the inlet and inside of the interlayer channel to form the silicon dioxide composite gel plugging layer with differentiated dissolution characteristics. The cement reinforcing agent prepared by the invention can effectively block interlayer alcohol amine molecules at the initial stage of cement hydration, and then a plugging layer is gradually dissociated according to the composition and structure of the plugging layer and a preset sequence, so that the sequential and controllable release of alcohol amine active ingredients is realized, the defects that a traditional alcohol amine additive is easy to consume too early and the acting time is short are overcome, and the cement reinforcing agent has a good application prospect. The later mechanical property and the volume stability of the cement-based material are obviously improved on the premise of not influencing the working performance of the cement.

The application discloses a preparation method of a microcrystalline glass binder for a semiconductor wafer thinning grinding wheel, which comprises the following steps: obtaining a plurality of raw materials of the microcrystalline glass binder, including ethyl orthosilicate, pseudo-boehmite, lithium hydroxide sol, boric acid, sodium nitrate, potassium nitrate, chromium hydroxide sol and butyl titanate; mixing the plurality of raw materials in a first solvent and sufficiently hydrolyzing to obtain a homogeneous precursor solution; then adding a PH adjusting substance, a non-polar solvent, lithium hydroxide sol and chromium hydroxide sol in sequence to obtain a homogeneous sol system; adding boric acid powder, sodium nitrate powder and potassium nitrate powder into the homogeneous sol system and performing heating and stirring to obtain a homogeneous mixed sol; performing aging and drying on the homogeneous mixed sol to obtain a mixed gel; and performing dry ball milling and wet ball milling on the mixed gel to obtain a microcrystalline glass binder powder. The microcrystalline glass binder prepared according to the application has a relatively low softening temperature and has relatively high strength and wettability.

The vaporizer comprises a bottom plate, the upper surface of the bottom plate is fixedly connected with a vaporizer body, and the left surface of the vaporizer body is fixedly connected with a feeding pipe connector, a heat removal opening, a gas outlet pipe connector and a concave heat preservation shell. The ends, away from the vaporizer body, of the feeding pipe connector, the heat removal opening and the gas outlet pipe connector penetrate into the concave heat preservation shell, the concave heat preservation shell is composed of two transverse heat preservation shell bodies and a longitudinal heat preservation shell body, and openings and sealing assemblies are formed in the front surfaces of the transverse heat preservation shell bodies and the left surface of the longitudinal heat preservation shell body correspondingly. The left surface of the transverse heat preservation shell is fixedly connected with a corrugated heat preservation sleeve, the left end of the corrugated heat preservation sleeve is fixedly connected with a conical sealing sleeve, and the inner wall of the conical sealing sleeve makes close contact with the surface of the guide pipe. Through the structure, the influence of the feeding pipe and the air outlet pipe of the vaporizer on the working effect of the vaporizer is reduced, and the compactness of the pipeline is improved.

This invention relates to an aqueous polyimide / SiO₂ nanocomposite coating and its preparation method. The preparation method of the aqueous polyimide / SiO₂ nanocomposite coating includes: dissolving an aromatic diamine monomer in a system composed of water and an organic base; adding an aromatic dianhydride monomer in batches to react and prepare an aqueous polyamic acid salt solution; adding a silane coupling agent to the aqueous polyamic acid salt solution to react and then adding an orthosilicate ester for in-situ hydrolysis and condensation to prepare an aqueous polyamic acid / SiO₂ nanocomposite coating; coating the aqueous polyamic acid / SiO₂ nanocomposite coating onto a substrate surface, followed by drying and imidization treatment to obtain the aqueous polyimide / SiO₂ nanocomposite coating. The aqueous polyimide / SiO₂ nanocomposite coating of this invention has excellent heat resistance and adhesion properties, and can be widely used in high-temperature protective coatings and electronic packaging fields.

This invention discloses a two-photon AIE nanoparticle, the preparation method of which includes the following steps: S1. Mixing tetrahydrofuran, a tetrahydrofuran solution containing AIE material, a tetrahydrofuran solution containing poloxamer 407, and methyl orthosilicate, and homogenizing the mixture to obtain a homogenized solution; S2. Adding the mixture obtained in S1 dropwise to deionized water under stirring, then homogenizing the mixture again, and then stirring; S3. Dialyzing and then filtering to obtain purified two-photon AIE nanoparticles; S4. Modifying the surface of silica with amino groups and then modifying it with dextran to obtain dextran-modified two-photon AIE nanoparticles. The preparation method disclosed in this invention has the advantages of simple preparation and low cost. The obtained nanoparticles have high stability, high safety, and high two-photon performance, and can be used for two-photon imaging of deep biological tissues.

The invention relates to the technical field of SPC floors, in particular to an SPC floor base material and a preparation method thereof. The SPC floor base material comprises the following raw materials in parts by mass: 40-80 parts of polyvinyl chloride resin, 10-30 parts of ethylene propylene diene monomer, 25-55 parts of calcium carbonate, 0.01-0.1 part of hexadecyl trimethyl ammonium chloride, 0.05-0.4 part of sodium fluoride, 5-10 parts of tetraethoxysilane, 1-5 parts of ammonia water with the mass fraction of 10-15%, 1-2 parts of a plasticizer, 1-2 parts of a stabilizer and 1-2 parts of a dispersing agent. The calcium carbonate is subjected to bionic treatment, so that the binding force between the calcium carbonate and the polyvinyl chloride resin and the binding force between the calcium carbonate and the ethylene propylene diene monomer are increased, the extremely low size deformation rate can be kept even if the addition amount is large, the warping and denaturation prevention effect is excellent, meanwhile, the good antibacterial effect is achieved, and the durability is remarkably improved.

The invention relates to a preparation method of glass beads with high silicification on surfaces, which is characterized by comprising the following steps: (1) washing the glass beads with a sodium hydroxide solution and deionized water in sequence to obtain pretreated glass beads; (2) mixing a modifier with deionized water, uniformly stirring to obtain a mixed solution, adding the pretreated glass beads into the mixed solution, and stirring for 2-3 hours to obtain modified glass beads; and (3) adding the modified glass beads into deionized water, continuously adding a sodium hydroxide solution and a tetraethoxysilane solution, uniformly stirring for reaction, separating the glass beads from the solution after the reaction is finished, and drying in a drying oven to obtain the high silicification glass beads with uniformly coated and compact surfaces. The method has the advantages that the process is simple, the coating process is stable, the reaction time is short, the energy consumption is low, the preparation process is environment-friendly, and the coating process is suitable for various glass bead specifications; and the prepared silicon dioxide film layer is uniform and strong in adhesive force, and the binding property of the glass beads and a matrix material is remarkably improved.

A filtration membrane including a first layer having a triamine-functionalized polysilicate mesoporous material, a second layer including a polysulfone; and a third layer including a polyester terephthalate is described. An orthosilicate group of the triamine-functionalized polysilicate mesoporous material is bonded to a silicon atom of a silicon-containing triamine to form a triamine-functionalized polysilicate backbone, wherein the silicon-containing triamine and one or more tetramines are covalently crosslinked with terephthaloyl chloride to form a polyamide, and wherein the triamine-functionalized polysilicate mesoporous material has a hierarchical structure of MCM-41. The membrane is adapted for use selected from the use group consisting of oil and water separation, water treatment, desalination, and pharmaceutical filtration.

The invention relates to the technical field of waterproof coiled materials, in particular to an anti-aging waterproof coiled material and a preparation process thereof. The preparation process of the anti-aging waterproof coiled material comprises the following steps: preparing the composite antioxidant, preparing the composite anti-ultraviolet agent, preparing the modified chitosan flame retardant and preparing the waterproof coiled material. The preparation method comprises the following steps: pretreating halloysite nanotubes, dispersing the pretreated halloysite nanotubes in an ethanol solution, adding tetraethoxysilane, carrying out a reaction under the catalysis of dibutyltin dilaurate to obtain a nano-hybrid carrier, carrying out surface modification on the nano-hybrid carrier by using KH-560, and loading 4-aminodiphenylamine on the surface of the nano-hybrid carrier by using a bridging effect of the KH-560 to obtain the 4-aminodiphenylamine loaded nano-hybrid carrier. According to the present invention, the supported composite antioxidant is prepared, can be uniformly dispersed in the waterproof coiled material matrix after being added into the waterproof coiled material so as to improve the thermo-oxidative aging resistance of the waterproof coiled material, and can be used as the rigid skeleton after being dispersed in the waterproof coiled material matrix so as to effectively improve the tensile strength of the waterproof coiled material.

This invention relates to the field of self-cleaning coating materials, and discloses the preparation and application of a nanofiber-confined Fe single-atom self-cleaning coating material. The invention uses wood nanofibers as a carbon-based carrier to obtain nanofiber-confined Fe single-atom materials. The three-dimensional network structure generated during the acidic hydrolysis of methyl orthosilicate enhances the bonding between the nanofiber-confined Fe single-atom materials, nano-silica, and nano-titanium dioxide nanoparticles. After hydrolysis, a diluent is added, and the reaction proceeds to obtain the nanofiber-confined Fe single-atom self-cleaning coating material. This self-cleaning coating material has a simple process, high operability, excellent antistatic properties, superhydrophilicity, and photocatalytic activity. It exhibits excellent anti-fouling potential in self-cleaning coating material applications and has broad application prospects.

The application relates to the technical field of lenses, in particular to a high-temperature-resistant lens and a preparation method thereof. The high-temperature-resistant lens comprises a lens base body and high-temperature-resistant coating layers coated on two sides of the lens base body, the high-temperature-resistant coating layers are coated by high-temperature-resistant coating liquid, and the high-temperature-resistant coating liquid comprises the following components: 100-200 parts of deionized water, 45-60 parts of methyl triethoxysilane, 15-30 parts of isopropyl alcohol, 15-60 parts of ethyl orthosilicate and 20-60 parts of silica sol. Inorganic silica coating layers formed by the combination of ethyl orthosilicate and silica sol are selected for surface modification treatment, due to the effective coating of the silicon film, inorganic coating layers can be formed at two ends of the lens, the inorganic coating layer structure can well resist high-temperature, high-humidity and high-heat environments, and therefore the high-temperature-resistant performance of the lens is improved.

The present invention relates to a nanoparticle that can be used to capture a pollutant, of the type comprising a core made of ferrimagnetic material, the core being covered with a layer of ethyl orthosilicate to which at least one cyclodextrin molecule is covalently attached by a linker comprising a main chain and side chains. Characteristically, the cyclodextrin molecule is linked to a triazole ring attached to the end of the chain of the linker and / or to the end of at least one side chain of the linker.

The application provides a rare earth catalyst for preparing array type carbon nanotubes and a preparation method thereof, and relates to the technical field of rare earth catalysts.The preparation method comprises the following steps: mixing hydrolysis of ethyl orthosilicate and bayerite to form a composite gel;after calcination of the composite gel, a porous carrier is prepared; after the porous carrier is immersed in a ligand solution, a cerium-containing liquid is added and stirred and mixed, and a catalytic precursor is separated; after the catalytic precursor is immersed in a complex solution, an iron-containing liquid is added and stirred and mixed, and a catalytic intermediate is separated; after a carbon coating layer is deposited on the surface of the catalytic intermediate, the rare earth catalyst is prepared by reduction under a hydrogen atmosphere.The catalyst provided by the application can make the carbon tube diameter distribution concentrated in the growth process of the array type carbon nanotubes, and the Fe-Ce-O interface can induce directional assembly of carbon atoms and reduce the pipe wall defect density.

The invention relates to PBAT (poly (butylene adipate-co-terephthalate)) resin for a full-biodegradable mulching film and a synthesis method thereof. The invention discloses PBAT resin for a full-biodegradable mulching film. The PBAT resin is prepared from the following raw materials: an AA esterification raw material, a PTA esterification raw material and a pre-polycondensation auxiliary agent, the AA esterification raw materials comprise adipic acid, 1, 4-butanediol, a compound catalyst and an auxiliary agent 1; the auxiliary agent 1 is prepared from ethyl orthosilicate and zinc isoocatanoate; the PTA esterification raw materials comprise terephthalic acid, 1, 4-butanediol, a compound catalyst and an auxiliary agent 2; the auxiliary agent 2 is ethyl orthosilicate; the compound catalyst is a titanium phosphorus compound catalyst; the pre-polycondensation auxiliary agent is an antioxidant and aluminum-magnesium hydrotalcite. According to the PBAT resin for the full-biodegradable mulching film and the synthesis method of the PBAT resin, on the basis of an existing PBAT conventional catalytic system, different functional auxiliaries are introduced in different stages, and the mechanical property, the water retention capacity and the hydrolysis resistance of the polymerized PBAT resin are effectively improved through the synergistic effect of the different functional auxiliaries.

A preparation method of the two-photon type AIE nano-particles comprises the following steps: S1, mixing tetrahydrofuran, a tetrahydrofuran solution containing an AIE material, a tetrahydrofuran solution containing poloxamer 407 and tetramethyl orthosilicate, and performing uniform treatment to obtain a mixed solution; s2, dropwise adding the mixed solution obtained in the step S1 into deionized water in stirring, then performing uniform treatment again, and then performing stirring; s3, dialyzing, and then filtering, so as to obtain purified two-photon type AIE nanoparticles; and S4, modifying glucosan after amino modification on the surface of the silicon dioxide to obtain the glucan-modified two-photon AIE nanoparticles. The preparation method disclosed by the invention has the advantages of simple preparation and low cost, and the obtained nanoparticles have high stability, high safety and high two-photon performance, and can be used for two-photon imaging of deep biological tissues.

The present invention relates to the technical field of concrete for hard rock tunnels in cold regions, and specifically discloses a thermal insulation material for hard rock tunnels in cold regions, a preparation method thereof, and an application thereof. The raw materials of the thermal insulation material for hard rock tunnels in cold regions include, by mass, 70-100 parts of cement, 10-14 parts of pretreated silica, 10-16 parts of fly ash, 10-20 parts of thermal insulation aggregate, 100-120 parts of machine-made sand, 0.5-1.2 parts of potassium silicate, 2-2.6 parts of water reducer, 0.1-0.5 parts of defoamer, 1-2 parts of accelerator, and 17-22 parts of water; the pretreated silica is prepared by the following specific operation: adding nylon 66 to a formic acid solution, stirring at 60-80°C for 1-2 hours, adding ethyl orthosilicate and continuing to stir for 10-20 minutes, adding nano-graphene oxide and stirring for 1-2 hours, cooling to 100-80°C, keeping warm for 1-2 hours, and freeze-drying.

The invention discloses a preparation method of high-purity phosphotriester, and belongs to the technical field of organic synthesis. The method comprises the following steps: firstly, cooling, crystallizing and purifying a phosphoric acid raw material, and respectively rectifying and purifying a tetraalkyl orthosilicate raw material and a reaction solvent to obtain a high-purity raw material and a solvent; then mixing high-purity phosphoric acid, high-purity tetraalkyl orthosilicate and a high-purity solvent, and carrying out one-step ester exchange reaction at 180-220 DEG C for 12-32 hours; and finally, carrying out post-treatment on the reaction liquid, and carrying out reduced pressure rectification on the obtained crude product to obtain a high-purity phosphotriester product. A chlorine-free raw material route is adopted from the source, and a deep purification process of a system before and after the reaction is combined, so that the content of arsenic ions in the product is effectively controlled to be 25 ppb or below, the content of chlorine ions is controlled to be 15 ppb or below, and the purity can reach 99.9999% or above. The method has the advantages of simple process, high yield and environmental friendliness, and is especially suitable for the fields with extreme requirements on impurity content, such as new energy batteries, electronic chemicals and the like.