959 results about "Gel method" patented technology

The invention discloses a high-strength and high-toughness aluminum nitride ceramic and a preparation method thereof, and relates to the technical field of ceramics, a sol-gel method is adopted to coat the surface of aluminum nitride with a stable shell layer to form a core-shell structure, meanwhile, the low lattice mismatch rate of a core-shell interface is utilized to reduce thermal resistance, and toughness and thermal conductivity are both considered; according to the external magnetic field tape casting method, the magnetic dipole moment orientation principle is utilized, an external magnetic field is applied in the tape casting stage, the in-plane mechanical property is improved, and the fracture toughness is improved through the magnetism of aluminum nitride whiskers; a reinforcement is introduced to improve the mechanical property and corrosion resistance of the aluminum nitride ceramic material, multi-granularity powder is compounded, large-particle aluminum nitride powder is used as a sintering and heat-conducting framework material, and high activity provided by submicron particles is utilized to promote sintering, so that the sintering temperature of aluminum nitride can be remarkably reduced, and the performance is greatly improved; and the aluminum nitride substrate expands more application fields on a future packaging circuit.

The invention belongs to the technical field of catalytic oxidation of carbon-containing industrial waste gas, and particularly relates to a Pd catalyst for catalytic combustion of carbon-containing waste gas as well as a preparation method and application of the Pd catalyst. The invention provides a Pd catalyst for catalytic oxidation of carbon-containing industrial waste gas such as CO and volatile organic pollutants VOCs. The Pd catalyst is obtained by compounding an amorphous CeO2 nano-cluster with a TiO2 substrate (marked as cCeO2 / TiO2) and indirectly regulating the form of Pd through gradient regulation of the content of the amorphous CeO2 nano-cluster by a sol-gel method on the basis of strong interaction of Pd and Ce species. The Pd catalyst prepared by the invention shows excellent low ignition temperature, high performance and certain universality in the catalytic combustion process of carbon-containing industrial waste gases such as CO and low-chain VOCs (Volatile Organic Compounds). In addition, the method for preparing the Pd catalyst is simple to operate and mild in condition, and has great industrial application potential and value.

The invention relates to the technical field of titanium dioxide, and discloses a preparation process of oil paint core-coated titanium dioxide, which comprises the following steps: a core layer is rutile type titanium dioxide particles with the particle size range of 0.1-0.5 mu m and the specific surface area of 8-15m < 2 > / g, an inorganic coating layer is composed of silicon dioxide and aluminum oxide according to the mass ratio of 1: (0.2-1.5), the coating thickness is 5-15% of the diameter of the core layer, and the inorganic coating layer is composed of silicon dioxide and aluminum oxide according to the mass ratio of 1: (0.2-1.5). Wherein the silicon dioxide is coated by a hydrolytic deposition method, the aluminum oxide is coated by a sol-gel method, the organic coating layer comprises a copolymer containing a silane coupling agent and organic silicon resin, the organic silicon resin is methyl phenyl silicon resin, the organic coating layer accounts for 1-8% of the total mass of the titanium dioxide, and the surface contact angle of the organic coating layer is greater than or equal to 110 degrees. According to the preparation process of the oil paint core-coated titanium dioxide, an inorganic-organic gradient coating system is constructed, so that the core-coated titanium dioxide has a gloss retention rate of more than 95% (ASTM D523) and a delta E color difference of less than 1.5 (ISO 7724) after 1000 hours in a QUV accelerated aging test, and the weather resistance of the core-coated titanium dioxide is improved by more than 3 times compared with that of the traditional titanium dioxide.

The invention belongs to the technical field of environmental protection, and provides a preparation method of an imine-modified functionalized mesoporous magnetic silicon dioxide nano material. The method comprises the following steps: synthesizing Fe3O4 magnetic nanoparticles in a Fe < 2 + > / Fe < 3 + > alkaline hydrolysis system through a coprecipitation method; then coating the magnetic nanoparticles with an amorphous silicon dioxide layer by taking TEOS (tetraethoxysilane) as a silicon source by adopting a sol-gel method, so as to prepare magnetic silicon coated nanoparticles; the prepared nano-particles are subjected to secondary silicon coating guided by a cetyl trimethyl ammonium bromide (CTAB) mesoporous template agent, and mesoporous magnetic silicon nano-particles are formed after calcination; and finally, carrying out surface amination modification on the mesoporous magnetic silicon nano-particles by utilizing an amino silane coupling agent, and then carrying out condensation reaction on the mesoporous magnetic silicon nano-particles and various aldehyde derivatives to construct imine bonds, so as to obtain the imine-modified functionalized mesoporous magnetic silicon dioxide nano-material. The imine-modified functionalized mesoporous magnetic silicon dioxide nano-material formed by the invention has the characteristics of efficient adsorption, rapid magnetic recovery and excellent environmental stability, and can effectively remove polystyrene micro-plastics and organic pollutants in a water body.

The invention relates to the field of plastic bags, and discloses a biodegradable plastic bag and a preparation method thereof, the biodegradable plastic bag comprises polylactic acid, poly (butylene adipate-co-terephthalate), a functional additive, modified starch, a lubricant and an antioxidant; the functional additive is prepared by grafting hydroxylated modified castor oil and isocyanated montmorillonite loaded titanium dioxide; the hydroxylation modified castor oil is prepared by modifying castor oil with chloroethyl isocyanate, then reacting with N-allylimidazole, and then reacting with 6-mercaptohexyl-1-alcohol; the isocyanated montmorillonite loaded titanium dioxide is prepared by reacting montmorillonite loaded titanium dioxide obtained by a sol-gel method with isophorone diisocyanate; the modified starch is prepared by reacting octadecanoyl chloride and acryloyl chloride with starch, then carrying out graft copolymerization with ethyl acrylate and further introducing glycidyl methacrylate, so that the plastic bag is endowed with excellent mechanical properties, biodegradability and antibacterial property.

The invention relates to the technical field of catalyst materials, and particularly discloses a high-stability hydrogenation catalyst and a preparation method thereof. The invention relates to a preparation method of a high-stability hydrogenation catalyst, which comprises the following steps: preparing a hollow porous microsphere as an inner core from amino-terminated hyperbranched polyaryletherketone and polyvinyl alcohol, and then coating the porous microsphere with a mesoporous silicon dioxide intermediate layer by a sol-gel method; and finally, forming an Mg-Al hydrotalcite layer on the outermost side through a coprecipitation method, dipping and modifying with La (NO3) 3 and Ce (NO3) 3 solutions to obtain a catalyst carrier, dipping the catalyst carrier in an active metal dipping solution, and drying to obtain the catalyst. The high-stability hydrogenation catalyst provided by the invention has excellent mechanical properties and more reaction active sites, has high catalytic activity and catalytic efficiency, and is relatively long in catalytic life.

The invention discloses a large-current-carrying-capacity flexible power cable, which belongs to the technical field of cable preparation, is used for solving the technical problem that the flame retardant property and the mechanical property of the power cable need to be further improved in the prior art, and specifically comprises a cable core, a wrapping layer, an insulating layer and a sheath layer which are sequentially arranged from inside to outside. The preparation method comprises the following steps: preparing alkoxy silane containing a benzocyclobutene group, preparing flame-retardant particles by using a sol-gel method, preparing modified polyurethane by using modified polysiloxane and 2, 5-furandimethanol as soft segments, naphthalene diisocyanate as a hard segment and trimethylolpropane as a chain extender, and preparing the flame-retardant flame-retardant polyurethane. The linear low-density polyethylene, the MAH-g-PE, the modified polyurethane, the flame-retardant particles and the auxiliary additive are melted and extruded outside the wire core to form the insulating layer, so that the power cable is obtained, the flame-retardant property of the power cable is effectively improved, and the mechanical property and the current-carrying stability of the power cable are also improved.

The invention discloses a preparation method of low-carbon-content high-purity quartz sand, which comprises the following steps: carrying out alkaline hydrolysis and drying on organosilane to obtain alkaline xerogel, putting the alkaline xerogel into a quartz tube of a rotary tube furnace, starting the furnace body, adjusting the rotation rate, heating to a specific low temperature, and introducing nitrogen to replace air; introducing oxygen, controlling the pressure, carrying out oxidation reaction, relieving the pressure to normal pressure after the reaction, pumping and discharging the product, and repeating the oxidation and pumping steps for many times until the tail gas carbon dioxide reaches the standard; raising the temperature, introducing chlorine-containing gas for purification, finally raising the temperature to a sintering temperature, and sintering in an air atmosphere to obtain the low-carbon-content high-purity quartz sand. According to the preparation method, the energy consumption and the equipment cost of the carbon removal procedure are greatly reduced, the specific surface area and the densification performance of the subsequent high-purity quartz sand product can be guaranteed, and a technical path which is low in energy consumption, high in efficiency and capable of giving consideration to the product performance is provided for industrial preparation of the high-purity quartz sand through a sol-gel method.

The invention relates to a surface-coated oxide solid electrolyte and a preparation method thereof, the surface-coated oxide solid electrolyte comprises an oxide electrolyte and a surface coating layer, the chemical formula of the oxide solid electrolyte is Li7-xLa3Zr2MxO12-x (M = Ta, Nb, Hf, Ge, Sc, Ti, Al, Si, Sn, Y, 0 < = x < = 1), the chemical formula of the surface coating layer is LiXON (R = Ta, Nb, Al, Zr, Ga, In, N = F, Cl, Br, I), and a lithium source, a lanthanum source, a zirconium source, an M source, an X source and an N source, or an XN source are connected in series, garnet solid electrolyte powder with a stable surface coating layer is obtained by adopting a solid phase method or a sol-gel method and combining a low-temperature calcination process; and then mixing and reacting with a lithium salt and a polymer electrolyte, and pouring the obtained slurry on a polyfluortetraethylene plate to prepare the composite electrolyte. Compared with the prior art, the high-ion conductor layer formed on the surface of the product in situ constructs a rapid transmission channel for lithium ion transmission in the composite electrolyte, and high ion conductivity is achieved.

The invention discloses a high-resilience eTPU foaming material and a preparation process thereof, and belongs to the technical field of foaming materials. The process comprises the steps of raw material premixing and TPU chain extension reaction, precursor system injection, in-situ phase change energy storage core-shell particle generation, supercritical two-fluid foaming and molding post-treatment. Wherein the SiO2-coated TiO2 core-shell particles are prepared by a non-hydrolytic sol-gel method, the porous SiO2 core adsorbs and fixes the micro-crosslinked polyurethane-based phase change material, the TiO2 shell provides sealing and supporting, the particles are combined with the TPU matrix through covalent bonds, and the micro-crosslinked polyurethane-based phase change material has a unique micro-crosslinked network structure, so that the thermal conductivity of the TPU matrix is improved, and the thermal conductivity of the TPU matrix is improved. The hidden danger of leakage of the phase change material in the using process can be effectively eliminated, and meanwhile the interface bonding effect between the inorganic particles and the TPU matrix is synchronously enhanced. The eTPU foaming material prepared by the invention has the characteristics of high resilience, strong interface bonding, excellent energy storage stability and low compression set, and is suitable for shoe materials, automotive interiors and other scenes.

The invention discloses a multi-layer flexible radiation cooling composite diaphragm which structurally comprises a flexible base layer film, and a SiO2 inorganic coating, a first layer of polyvinylidene fluoride (PVDF), a nano-silver layer deposited by magnetron sputtering and a second layer of PVDF which are sequentially coated to form a base layer film / SiO2 / PVDF / Ag / PVDF sandwich structure. The SiO2 layer is prepared through a sol-gel method, the surface roughness is smaller than 2 nm, and the visible light transmittance is larger than 95%; the thickness of the silver layer is 50 + / -5 nm, and the total thickness of SiO2 / PVDF / Ag does not exceed 150 nm. According to the composite diaphragm, ultraviolet reflection, visible light high transmission (greater than 92%) and near-infrared high reflection (greater than 88%) are realized through spectrum selective regulation and control, and meanwhile, SiO2 and PVDF synergistically enhance the infrared emissivity of an atmospheric window wave band (8-13 [mu] m). The flexible PET base material is combined with the PVDF interlayer design to restrain silver layer oxidation and interface stripping, the recovery rate is larger than 95% after 1000 times of bending circulation, and the NIR reflectivity attenuation is smaller than or equal to 5%. The composite diaphragm disclosed by the invention has the advantages of high light transmission, efficient cooling, excellent flexibility and long-term stability, and is suitable for flexible scenes such as agricultural greenhouses and the like.

The invention relates to the technical field of tempered glass, in particular to a preparation method of low-warpage tempered glass, which comprises the following steps: (1) pretreatment: cleaning and drying the surface of glass by adopting an organic solvent and deionized water in sequence, and uniformly spraying an adhesive agent on the atmosphere surface of the glass; (2) SiO2-ZrO2 film coating: uniformly spraying SiO2-ZrO2 gel on the glass atmosphere surface by adopting a sol-gel method, and forming a SiO2-ZrO2 composite film layer with uniform texture on the glass atmosphere surface; and (3) strengthening: putting the coated glass into mixed molten salt, and strengthening at the temperature of 390-410 DEG C for 8-10 hours. The SiO2-ZrO2 composite film layer is arranged on the glass atmosphere surface, so that the ion exchange rate difference between the atmosphere surface and the tin surface can be reduced, the stress difference can be reduced, the component proportion can be accurately regulated and controlled, the tin permeation rate can be reduced, and the warping value of the tempered glass can be remarkably reduced through the synergistic effect of the SiO2-ZrO2 composite film layer and the tin surface.

The invention belongs to the field of photocatalytic material preparation, and particularly relates to a ZnFe2O4 / TiO2 / BC composite material as well as a preparation method and application thereof. The novel photocatalytic material ZnFe2O4 / TiO2 / BC composite material is prepared through a sol-gel method and a coprecipitation method, the photocatalytic performance of titanium dioxide and zinc ferrite is improved, and the application field of titanium dioxide and zinc ferrite is widened. The dopant provided by the invention is relatively low in price, the process is relatively simple, and the photocatalyst with a wider light absorption range can be prepared and can be used for degrading sulfamethoxazole.

The invention discloses a samarium manganese mullite catalyst rich in Sm vacancy and a preparation method and application thereof, and belongs to the technical field of VOCs waste gas catalytic oxidation. According to the invention, samarium nitrate and manganous nitrate are used as precursors, citric acid monohydrate is used as a chelating agent, urea is used as an additive, and the samarium manganese mullite catalyst rich in Sm vacancies is synthesized through a sol-gel method. The Sm vacancy samarium manganese mullite catalyst prepared by the invention shows excellent toluene catalytic oxidation low-temperature activity due to selective removal of inert Sm atoms on the surface of samarium manganese mullite, more active Mn atoms are exposed, and the surface lattice oxygen migration performance is enhanced. The catalyst has excellent performance in a stability test and a water vapor resistance test, and has a wide industrial application prospect.

The invention relates to the technical field of amorphous TiC ceramics, in particular to a wear-resistant plate based on an amorphous TiC ceramic wear-resistant coating and a surfacing process thereof, and the wear-resistant plate comprises the following raw materials in parts by weight: 20-40 parts of multi-element powder, 70-80 parts of Ti powder and 20-30 parts of C powder; the preparation process of the multi-element powder comprises the following steps: step 1, synthesizing Al2O3-Cr2O3 core-shell particles through a sol-gel method; 2, mechanical alloying is carried out; 3, sintering is conducted, and multi-element powder is obtained; according to the invention, Al2O3 coated Cr2O3 core-shell particles are adopted to solve the problem of reinforcement phase / matrix interface failure; in-situ amorphous TiC forming realizes instantaneous high temperature and rapid cooling under the powder blank density of 60-80% through resistance wire short-circuit self-propagating reaction, and breaks through amorphous phase preparation limitation.

The invention belongs to the technical field of silicon dioxide materials, and relates to a preparation method of medicinal silicon dioxide by a gel method, which comprises the following steps: S1, filtering water glass by an inorganic treating agent, treating the filtered water glass by multiple layers of cation exchange resin to obtain a water glass solution, and treating a sulfuric acid solution by multiple layers of cation exchange resin; s2, firstly adding the water glass solution in the step S1, and then adding the sulfuric acid solution treated in the step S1 to form silica sol; s3, adding sulfuric acid on the basis of the silica sol formed in the step S2, adjusting the pH value to be acidic, stirring, adding a water glass solution, adjusting the pH value to be alkaline, heating and boosting for aging, adjusting the pH value to be acidic, and aging to form silica gel; and S4, washing the silica gel, and performing two-stage spray drying and screening to obtain the silica gel. Compared with related silica products for Grace medicine, the gel forensic medicinal silica synthesized by the invention has the advantages of better heavy metal content, dioxin control and particle size uniformity and lower impurity content, and can be better applied to the field of medicine.

The invention provides a preparation method of a metal-based ceramic composite membrane with a catalytic ozone function. The preparation method comprises the following steps: preparing functional powder by taking tetrabutyl titanate as a titanium source and silver nitrate or ferric nitrate as a catalytic active metal source and adopting a sol-gel method; a porous metal pipe is used as a supporting body, metal powder and functional powder which are made of the same material as the supporting body are mixed to prepare functional slurry, the functional slurry is evenly deposited on the inner wall of the supporting body through vacuum filtration, and powder particles which are not firmly combined are removed through back flushing; and finally, the binding force between the functional film layer and the metal matrix is improved through high-temperature heat treatment. Wherein the thermal expansion coefficient difference between the metal supporting body and the functional film layer can be reduced by adding the metal powder, the metal powder is melted and diffused in the high-temperature heat treatment stage, and metallurgical bonding is formed between the functional powder and the metal substrate. The method is simple in process, and the prepared metal-based ceramic composite membrane has the advantages of being high in membrane layer binding force, not prone to falling off, high in catalytic activity, high in anti-pollution capacity, stable in operation and the like.

The invention belongs to the technical field of food safety sensing detection, adsorption and degradation, and particularly relates to an MIP / MOF / COF hybrid material and a preparation method and application thereof. Aiming at the defects and bottleneck problems of the existing patulin detection and removal technology, the preparation method comprises the following steps: firstly preparing an MOF / COF composite material, and then preparing an MIP / MOF / COF hybrid material by a sol-gel method, so that the photoelectrochemical sensor based on the MIP / MOF / COF hybrid material is constructed and is used for detecting patulin; meanwhile, based on the MIP / MOF / COF hybrid material, an attachment and degradation test platform is constructed. The prepared photoelectrochemical sensor can successfully detect trace patulin, and the hybrid material has good adsorption and degradation performance on patulin.

The invention relates to the technical field of solar cells, in particular to a CZTSSe absorption layer film and a preparation method and application thereof, and the preparation method comprises the following steps: S1, preparing a CZTS precursor solution of a DMF solution system; s2, preparing a CZTS precursor film by adopting a sol-gel method; and S3, coating the CZTS precursor thin film with a NaF solution with the concentration of 0-0.2 mol / L, and then carrying out drying and selenylation treatment to obtain the CZTSSe absorption layer thin film. According to the invention, the CZTS precursor film prepared by using the green and environment-friendly solvent DMF is used for carrying out a NaF solution spin-coating annealing process, so that the improvement of the battery efficiency is successfully realized. The change of CZTSSe film element redistribution, defect chemical environment and grain boundary potential difference after the Na element is doped is avoided.

The invention discloses a self-repairing type phase change microcapsule and application thereof in a wood-based energy storage wall, the self-repairing type phase change microcapsule is characterized in that an inner core layer is composed of composite paraffin and butyl stearate composite phase change materials, gradient refractive index silicon dioxide microspheres are arranged on the surface of the inner core layer, and a middle shell layer is a composite film formed by polyurea and furan-epoxy monomer copolymer; the reinforced shell layer is of a three-dimensional network structure which is formed by nano SiO2 through a sol-gel method, has the porosity of 20-25% and is in gradient distribution; according to the invention, a three-dimensional network structure formed by a Diels-Alder dynamic bonding network of a middle shell layer and nano SiO2 of an enhanced shell layer is used for synergistically constructing a self-repairing system of the microcapsule, so that the self-repairing function of the phase change microcapsule material is realized, the defect of failure caused by physical damage of the microcapsule is avoided, and the service life of the phase change microcapsule material is prolonged. And meanwhile, through gradient packaging preparation of the inner core layer and the enhanced shell layer, the problem of thermal stress concentration is effectively solved.

The invention discloses a layered structure solid oxide fuel cell composite cathode catalyst as well as a preparation method and application thereof, and belongs to the field of solid oxide fuel cells. The invention aims to solve the problem that the electro-catalytic performance and low-oxygen reduction reaction activation energy of the existing medium-temperature solid oxide fuel cell are poor. The Sr2. 9Ca0. 1Fe2O7-CuO composite cathode catalyst is prepared by adopting a sol-gel method and a solid phase method, the components in a sol-gel system are in a nanometer range, the reaction is easier to carry out, the reaction temperature is low, the prepared materials are uniformly mixed, and the sol-gel method is carried out in a solution, so that even if the content of doped elements is very low, the doping can be easily realized; the material is prepared by adopting a solid phase method, and the method has the advantages of convenience in operation, simple synthesis process, uniform particle size, no agglomeration of powder particles, good filling property, low cost, high yield and the like, so that the electrochemical performance of the cathode catalyst is improved, and the method is convenient to operate and suitable for industrial production.

The invention relates to the technical field of sustained-release microcapsules, and particularly discloses a thermochromic sustained-release microcapsule as well as a preparation method and application thereof. A capsule core of the microcapsule comprises perfume and a thermochromic composite material, a capsule wall is of a double-layer structure, the inner capsule wall is a porous silicon dioxide layer, and the outer capsule wall is a polyurethane layer formed by xylooligosaccharide and isocyanate; the thermochromic composite material is a reversible thermochromic compound comprising a color former, a color developing agent and a solid solvent. According to the invention, a porous silicon dioxide inner shell layer is prepared by a sol-gel method, polyurethane formed by xylooligosaccharide and isocyanate through nucleophilic addition reaction is taken as an outer shell layer, and through the combined action of a double-layer capsule wall structure, the functions of thermochromism and perfume slow release are continuously exerted. In addition, xylooligosaccharide serving as one of raw materials of the outer capsule wall is wide in source, green and environmentally friendly, the biocompatibility of the microcapsule can be effectively improved, and the xylooligosaccharide microcapsule has very important significance in expanding the application field of the microcapsule.

The invention provides a functional filler, a preparation method thereof, an inorganic thermal control coating and application, and belongs to the technical field of coatings. The preparation method of the functional filler comprises the following steps: by taking a zinc acetate aqueous solution as a raw material, adding indium nitrate and aluminum nitrate, stirring and dissolving, then sequentially adding a complexing agent and a stabilizer, heating in a water bath to form transparent gel, and finally sintering at high temperature. According to the preparation method, a sol-gel method and a high-temperature sintering process are adopted to dope an indium element and an aluminum element into zinc oxide to prepare indium-aluminum co-doped zinc oxide, and then the indium-aluminum co-doped zinc oxide is used as a functional filler to be added into inorganic silicate resin to prepare the inorganic thermal control coating. The aluminum element and the indium element can synergistically act to improve the temperature resistance of the coating, so that the inorganic silicate coating with protection and thermal control effects is obtained, can be used on the surface of a spacecraft and has good thermal control and temperature resistance effects.

The invention relates to the technical field of wire and cable insulating materials, and provides a room-temperature self-crosslinking flame-retardant insulating material and a preparation method thereof.The preparation method comprises the steps that a magnetic metal hydroxide flame retardant is prepared through a sol-gel method, and modified vinyl silane is prepared through a ring-opening polymerization reaction; the preparation method comprises the following steps: performing ordered grafting granulation on polyolefin resin, a magnetic metal hydroxide flame retardant and modified vinyl silane to prepare matrix granules; and blending the matrix granules with the catalytic granules, carrying out extrusion molding on the blended granules, and standing at room temperature to obtain the room-temperature self-crosslinking flame-retardant insulating material. According to the room-temperature self-crosslinking flame-retardant insulated cable and the preparation method thereof, the flame retardant property can be improved, the crosslinking efficiency and cost can be optimized, and the mechanical property and the insulating property can be optimized.

The invention relates to an aerogel-derived ultralow-temperature water-sulfur poisoning-resistant flue gas denitration catalyst and a preparation method thereof, and belongs to the technical field of air pollution control and environment catalytic material frontier. CeMnNiOx composite oxide is used as an active component of the catalyst, a catalyst precursor gel with a three-dimensional network structure is formed through a sol-gel method, and then the hydrophobic aerogel derivative denitration catalyst with a high specific surface area, low density and a three-dimensional porous structure is obtained through aging, freeze drying and high-temperature heat treatment. The denitration efficiency of the catalyst can reach 90% or above at the temperature of 80-270 DEG C in a complex atmosphere containing 5-10% of water vapor and 50-100 ppm of SO2. The method is suitable for deep purification of NOx in ultralow-temperature and high-humidity SO2-containing complex flue gas after industrial desulfurization and dust removal.

The invention relates to the field of pipeline materials, and discloses a halogen-free flame-retardant MPP power pipeline material and a preparation method thereof.The pipeline material comprises polypropylene, modified multi-walled carbon nanotubes, a coating filler, a compatilizer and a lubricant; the modified multi-walled carbon nanotube is prepared by carrying out acylating chlorination on an oxidized multi-walled carbon nanotube by using thionyl chloride and then reacting with an aminated cyclotriphosphazene derivative; according to the aminated cyclotriphosphazene derivative, phosphonitrilic chloride trimer and 3, 5-di-tert-butyl-4-hydroxybenzylamine react to prepare a cyclotriphosphazene intermediate, the cyclotriphosphazene intermediate and N, N '-bis-(2, 2, 6, 6-tetramethyl-4-piperidyl)-1, 6-hexamethylenediamine are subjected to substitution to prepare a cyclotriphosphazene derivative, and then the cyclotriphosphazene derivative and 1, 6-hexamethylenediamine are subjected to substitution to obtain the aminated cyclotriphosphazene derivative. The coating filler is prepared by preparing modified lignin by combining 2, 2, 6, 6-tetramethyl-4-piperidinol and lignin and then preparing silicon dioxide-coated modified lignin by adopting a sol-gel method, and the pipe prepared by the invention has excellent mechanical properties, flame retardance, thermo-oxidative aging resistance and ultraviolet aging resistance.

The invention discloses a plant starch composite material for children's toys and a preparation method thereof, and belongs to the technical field of degradable materials.The preparation method comprises the steps that double-bond silicon dioxide microspheres are prepared through a sol-gel method and polymerized with methyl methacrylate, then a styrene-maleic anhydride copolymer is hydrolyzed under the acidic condition, and the plant starch composite material is obtained; the preparation method comprises the following steps: hydrolyzing a styrene-maleic anhydride copolymer to obtain a hydrolyzed copolymer containing a carboxyl group, carrying out esterification reaction on the hydrolyzed copolymer and starch, consuming a large amount of hydroxyl groups on the surface of the starch by the esterification reaction so as to increase the compatibility of the starch and PBAT, and forming a flexible coating layer on the surface of the starch by a long-chain structure of the hydrolyzed styrene-maleic anhydride copolymer so as to prevent agglomeration among starch particles; the coating layer has a relatively low friction coefficient, is easy to generate molecular chain slippage when being stressed, and endows the surface with self-lubricating property, so that the microspheres can disperse stress through sliding in the use or processing process, the coating layer forms a soft shell on the surfaces of the microspheres, and direct contact of the microspheres is prevented through steric hindrance, so that the microspheres are not easy to agglomerate.

The invention discloses a doped perovskite catalyst with a noble metal exposed on the surface, a preparation method and application thereof, belongs to the technical field of catalytic materials, and particularly relates to application in catalytic removal of volatile organic compounds. The method comprises the following steps: performing composite molding on rare earth elements / alkaline earth metals, transition metals and noble metals by adopting a sol-gel method, and performing strong acid surface etching and other operations. The surface of the catalyst is provided with a noble metal nanocluster or noble metal nanoparticle structure, so that the surface area is increased, more active sites can be provided, the adsorption of reactant molecules is enhanced, and the conversion rate and selectivity of a catalytic reaction are further improved. Based on the structure and performance advantages, the catalyst disclosed by the invention can be used for efficiently removing volatile organic compounds, can effectively reduce the initial temperature of the catalytic oxidation reaction of the volatile organic compounds, and has a wide application prospect in treating various industrial processes needing high-temperature and efficient catalysis.

The invention relates to a high-purity HDPE composite material with a self-cleaning function for an ultra-clean barrel, and belongs to the technical field of high polymer materials. Comprising the following raw materials in parts by weight: 85-95 parts of high-density polyethylene, 3-5 parts of a modified filler, 1-2 parts of an antioxidant and 0.5-1.5 parts of a plasticizer. Nano silicon dioxide is deposited on the surface of bismuth oxybromide by a modified filler through a sol-gel method, so that the photocatalytic efficiency and the material stability are improved, and the dispersity in an HDPE (High-Density Polyethylene) matrix is improved; and then a silane coupling agent KH570 is grafted on the surface of silicon dioxide, so that the material is endowed with hydrophobic performance, pollutant adhesion is prevented, meanwhile, the compatibility with HDPE is enhanced, and the mechanical property of the composite material is improved. Acetyl tributyl citrate and epoxidized soybean oil are mixed according to the ratio of 1: 1 to serve as an environment-friendly plasticizer, and the processability, flexibility and impact strength of HDPE are synergistically improved. The HDPE composite material prepared by the invention has a self-cleaning function, excellent mechanical properties and environmental friendliness, and is suitable for ultra-clean barrel products.

The invention discloses a method for preparing high-toughness silicon nitride ceramic from Si3N4 and multi-element rare earth additive core-shell structure powder, multi-element rare earth nitrate, tetraethoxysilane and Si3N4 powder are used as main raw materials, elements of a multi-element rare earth sintering additive system are uniformly distributed through a sol-gel method, and silicon nitride particles are uniformly coated, so that the high-toughness silicon nitride ceramic is prepared. A uniform liquid phase can be provided for dominant development of silicon nitride crystal grains, so that full development of double-peak morphology of the silicon nitride crystal grains is promoted, and the bending strength and fracture toughness of the silicon nitride ceramic are improved.