33results about How to "Small bulk density" patented technology

The preparation method comprises the following steps: mixing agar, carrageenan and a gelatin solution to prepare a core material hydrogel; mixing sodium hydroxide, water glass and water to prepare an intermediate binder A; mixing the regenerated micro powder with biochar to prepare an intermediate binder B; mixing the binder A and the binder B to obtain an intermediate binder; mixing the regenerated micro powder and the granulated blast furnace slag powder to obtain an outer core material; putting hydrogel into the binder A and the binder B, wrapping the surface of the hydrogel with a mixed binder solution, putting the hydrogel into the binder B, obtaining a material C, and drying and curing the material C to obtain a hollow core; and granulating the hollow core, spraying the binder A while pouring the shell powder to form a spherical aggregate, and rolling the spherical aggregate at a rotating speed to obtain the unfired hollow artificial aggregate. According to the preparation method disclosed by the invention, the unfired hollow artificial aggregate with relatively low bulk density and relatively high single-particle compressive strength is prepared by taking the regenerated micro powder and the slag solid waste material as a shell and the hydrogel as an inner core in an alkali excitation manner.

The invention belongs to the technical field of heat-insulating bricks, and particularly relates to a heat-insulating refractory brick and a preparation method thereof. The heat-insulating refractory brick is prepared from the following raw materials in percentage by mass: 20-60% of secondary quartzite aggregate of 0.5-0.1 mm, 30-70% of secondary quartzite fine powder of less than 0.1 mm, 5-10% of clay and 3-10% of a mineralizer, 30-40% of modified straw powder and 3-5% of a binding agent are additionally added. The heat-insulating refractory brick disclosed by the invention is excellent in high-temperature volume stability, low in preparation cost, small in volume density and light in weight, the apparent porosity is up to 60%, and the requirements of the heat-insulating refractory brick for a high-temperature kiln are met.

The invention discloses a porous polymer composite diaphragm and a preparation method thereof, and relates to the technical field of batteries. The method comprises the following steps: 1, mixing polyether sulfone with a solvent, and fully dissolving to form a homogeneous solution, thereby obtaining feed liquid A; mixing and uniformly stirring an auxiliary agent and a solvent, adding an inorganic filler, and continuously stirring to uniformly disperse the inorganic filler to obtain a feed liquid B; 2, mixing the feed liquid A and the feed liquid B, and fully stirring to form slurry; 3, uniformly coating a base film with the slurry by adopting a gravure coating method to obtain a wet coating diaphragm; and 4, soaking the wet coating diaphragm into a coagulating bath, then soaking in water, washing, and drying to obtain the porous polymer composite diaphragm. The porous polymer composite diaphragm and the preparation method thereof provided by the invention have the beneficial effects that polyether sulfone is used as a main body material, so that the heat resistance, the dimensional stability and the electrolyte wettability of the diaphragm are improved, the internal resistance of a battery is reduced, and the safety and the electrochemical performance of the battery are improved.

The present application relates to the technical field of castables, and specifically discloses a high-performance hawk beak castable and a preparation method thereof. A high-performance hawk beak castable, using a first aggregate and fused white corundum as aggregates, composite coated graphite powder, silicon nitride, α-alumina micropowder, silicon dioxide micropowder and barium sulfate as powders, calcium aluminate cement as a binder, sodium hexametaphosphate and sodium tripolyphosphate as composite dispersants, tri(2-hydroxypropionic acid) aluminum salt and an active agent as adjuvants, and is cast, heat-insulated, and fired in two stages. The high-performance hawk beak castable prepared in this application has the characteristics of high flexural strength and compressive strength, small permanent linear change rate, expansion resistance, good thermal shock stability, good burst resistance, and metal corrosion resistance.

The application discloses an aerogel composite thermal insulation material and a preparation device thereof, which comprises a blast oven and a drying groove, a circulating pipeline blower is installed on the drying groove, a motor is fixedly installed on the side wall of the blast oven, a fixed rod is fixedly connected to the output end of the motor, the fixed rod penetrates through the inner wall of the drying groove and extends to the inner side of the drying groove, a fixed frame is fixedly connected to the end face of the fixed rod, a fixing structure is installed on the fixed frame, the fixing structure comprises a connecting rod which is rotatably connected to the side wall of the fixed frame, a fixed plate is fixedly connected to the side wall of the connecting rod, and a fixed bottom plate is fixedly connected to the side wall of the fixed plate. The application can make the pre-oxidized material be heated more uniformly, simultaneously, the material is beaten, the material is kept in a fluffy state, the processing of the material is facilitated, and the aerogel material with low bulk density, high flame-retardant grade and good thermal insulation effect can be quickly and effectively produced.

The application discloses a light-weight anti-settling type silicone heat-conducting pouring sealant powder filler and a preparation method thereof, and belongs to the technical field of heat-conducting pouring sealant materials. The powder filler is prepared by mixing 70-80 microns of aluminum hydroxide, 50-70 microns of silicon dioxide, 7-10 microns of aluminum hydroxide and 2-3 microns of aluminum oxide, and then adding a surface modifier for dry modification. The application effectively reduces the packing density of the filler, inhibits the settlement and stratification, and maintains good fluidity and heat-conducting performance by means of four-stage particle size grading and the combination of aluminum hydroxide / silicon dioxide / aluminum oxide three-material compounding and dry surface modification. After the obtained powder filler is compounded with vinyl silicone oil, the density of the pouring sealant can be as low as 2.02 g / cm3, the 72-hour settlement amount is only 0.3 mm, the heat-conducting coefficient reaches 1.46 W / m.K, and the pouring sealant has the advantages of light weight, anti-settling, high heat-conducting, low viscosity, halogen-free and flame-retardant. The powder filler has simple preparation process, low cost and wide application.

The application provides a non-calcined phosphogypsum foam light aggregate and a preparation method thereof, and belongs to the light aggregate field.The non-calcined phosphogypsum foam light aggregate provided by the application takes modified phosphogypsum, mineral powder, cement clinker, bauxite, silica fume, kaolin and a foaming agent as the preparation raw materials of the foam inner core, takes phosphogypsum, fast-hard high-iron sulfoaluminate cement and building glue powder and water as the preparation raw materials of the fast-hard cementitious material shell layer, and the obtained non-calcined phosphogypsum foam light aggregate with a core-shell structure has a bulk density of <800 kg / m 3 The non-calcined phosphogypsum foam light aggregate has a small bulk density, and the fast-hard cementitious material shell layer improves the strength of the non-calcined phosphogypsum foam light aggregate, so that the non-calcined phosphogypsum foam light aggregate has a good application prospect in the ultra-light concrete field; the foam inner core and the fast-hard cementitious material shell layer are self-assembled into a core-shell structure, so that the pollutants are quickly encapsulated in the inner core by the shell layer material with good compactness, the leaching toxicity of the non-calcined phosphogypsum foam light aggregate is reduced, and the environmental protection performance is excellent.

The invention relates to the technical field of refractory materials, in particular to an iron runner castable and a preparation method thereof. The iron runner castable comprises fused quartz, silicon carbide, quartz powder, zirconium-containing silicon micro powder, ball pitch, wettable crystalline flake graphite, metal silicon powder, iron scale powder, hydrated calcium silicate, a water reducing agent, explosion-proof fibers and silica sol. The raw materials of the iron runner castable can cooperate with one another, the volume density and the thermal expansion coefficient of the iron runner castable are reduced, and the thermal folding strength is improved, so that the unit refractory consumption cost of a molten iron runner is reduced, the crack phenomenon is reduced, the molten iron scouring resistance is improved, the characteristics of the molten iron runner are better met, and the service life is longer.

The invention relates to the technical field of hazardous waste landfill, in particular to a hazardous waste rigid landfill method which comprises the following steps: pre-treating a to-be-landfilled material into a loose material and a compressed material, and packaging to respectively obtain a bagged loose material and a bagged compressed material; the bagged loose materials and the bagged compressed materials are lifted and conveyed to a transfer conveying platform of the transfer conveying unit; the transfer conveying platform is moved to the material receiving position of the landfill operation unit, and the bagged materials are moved to a material storage area from the transfer conveying platform; transporting the bagged materials from the material storage area to a specified drop point of a specified landfill area by utilizing a landfill operation unit; and the steps are repeated, stacking of the bagged compressed materials in the landfill area is completed, gaps formed after stacking are filled with loose materials in the bagged loose materials, the whole landfill area is compacted, and landfill is completed. According to the method, the operation efficiency is improved, and the rigid landfill storage capacity utilization rate is increased while the stacking density is increased.

The invention relates to the technical field of building materials, and discloses artificial coarse aggregate and a preparation method thereof. The artificial coarse aggregate is prepared from the following raw materials in parts by weight: 100 parts of sea sand; 12 to 20 parts of a binder; 0.06 to 0.18 part of a coalescing agent; 12 to 20 parts of water; wherein the binder is an acrylate copolymer emulsion with the solid content of 50%, and the coalescing agent is propylene glycol monobutyl ether. The preparation method comprises the steps of raw material pretreatment and mixing, adhesive solution preparation, rolling agglomeration granulation, curing maintenance, screening and the like. By controlling the particle size grading of the sea sand, the use amount of the binder and process parameters, the prepared artificial coarse aggregate is in an irregular polygonal form, has a rough and porous surface, has proper bulk density, cylinder compressive strength and water absorption, and can meet the use requirements of C25-C35 grade lightweight concrete. According to the method, efficient utilization of sea sand resources is achieved, the process is simple, energy consumption is low, and the method has good engineering application prospects.

The present invention discloses a polyimide polymer and a preparation method and application thereof. The polyimide polymer has a structure shown in formula (I): #imgabs0# wherein n is in the range of 50 to 500; R1 is selected from H, C 1～3 Alkyl; R 2 Selected from #imgabs1#‑OR 3 The group is monosubstituted or polysubstituted, and the R 3 At least one selected from #imgabs2#. A bulky siloxane side group is introduced into the structural formula of the polyimide polymer of the present invention. Due to the presence of a triphenylmethane structure in the PI main chain, it has excellent heat resistance and mechanical properties. On the other hand, thanks to the introduction of the siloxane side group, the packing density of the molecular chain and the formation of charge transfer complexes (CTCs) can be significantly reduced, so that the dielectric properties, transmittance and solubility of the PI film prepared therefrom are improved.

The utility model belongs to the technical field of metallurgical devices, and particularly provides a reaction kettle device which comprises a reaction kettle, a discharging pipe, an overflow pipe and a discharging nozzle, the reaction kettle is provided with a reaction cavity and a connecting channel, one end of the discharging pipe is located in the reaction cavity, and the other end of the discharging pipe is located in the connecting channel and communicates with the overflow pipe through the discharging nozzle. The discharging nozzle comprises a conical part, the conical part is provided with a connecting hole communicated with the pipe cavity of the overflow pipe, the boundary dimension of the conical part is gradually reduced in the direction away from the overflow pipe, and the conical part is inserted into the connecting channel and arranged on the discharging pipe in a sleeving mode through the connecting hole. The boundary dimension of the conical part is gradually reduced in the direction away from the overflow pipe, so that the gap between the outer wall of the conical part and the inner wall of the connecting channel is gradually increased in the direction away from the overflow pipe, and compared with the gap which is kept unchanged, the gap increase is beneficial to loosening disintegrating slag and reducing the bulk density of the disintegrating slag; therefore, the extraction resistance of the discharge nozzle is reduced, and the convenience of dismounting the discharge nozzle and the overflow pipe is improved.

The present invention belongs to the technical field of catalyst carrier preparation, and specifically relates to a high-performance environmentally friendly catalyst carrier and a preparation method thereof, comprising the following steps: (1) dissolving an aluminum salt and a first hydroxypropyl-β-cyclodextrin in deionized water to obtain an aluminum salt solution; (2) dissolving aluminate and a second hydroxypropyl-β-cyclodextrin in deionized water to obtain aluminate solution; (3) heating the aluminum salt solution, and then dripping the aluminate solution to obtain a mixed solution; (4) heating to 70-90°C, standing for aging; (5) filtering, washing, drying, and calcining to obtain a high-performance environmentally friendly catalyst carrier. The present invention adds the natural organic substance hydroxypropyl-β-cyclodextrin to the solution of aluminum salt and aluminate in advance, which can promote the dispersion of the reaction product during the solution dripping process, reduce the packing density of aluminum oxide, increase the pores between particles, and then increase the specific surface area and pore size of aluminum oxide, has the characteristics of safety and environmental protection, and has broad application prospects.

According to the method, 4-6 sections of temperature control areas are arranged in a vertical reactor at equal intervals, at least two sections of non-interval temperature control areas are arranged on the upper portion to serve as nucleation ends, a partition plate is adopted in the middle to form a temperature control area to serve as a transition section, and the bottom serves as a raw material end; in an inert atmosphere, respectively placing a mixture containing a phosphorus source, a catalyst and a transport agent at the raw material end and the transition section; and sequentially heating the raw material end, the transition section and the nucleation end to prepare the black phosphorus crystal. And carrying out high-temperature reaction by optimizing a heating program and the proportion of each partition material to prepare the high-quality black phosphorus crystal. On one hand, the partition plates are added to weaken the acting force between materials in the vertical space, and the gas phase-solid phase heat transfer mode in the amplification process is achieved; and on the other hand, through optimization of a heating program and the feeding proportion of the upper parts of the partition plates, the contact area between materials is increased, the reaction is accelerated, the single black phosphorus crystal yield is increased, and the reaction time is shortened.

The invention provides a green preparation process of tapioca sour starch with baking expansibility, and relates to the technical field of food preparation, the process comprises the following steps: (1) preparation of tapioca native starch, (2) fermentation and ultraviolet irradiation, and (3) drying. After the cassava raw starch is prepared, the cassava raw starch is subjected to denaturation treatment in a manner of combining fermentation with ultraviolet radiation, and then the drying process is combined, so that the finally obtained cassava sour starch has the characteristic of good baking expansibility.

The invention discloses a high-thermal-shock heat-insulating brick based on aluminum ash and a preparation method of the high-thermal-shock heat-insulating brick, and relates to the field of refractory materials. The aluminum ash-based high thermal shock insulation brick is mainly prepared from the following raw materials in parts by weight: 40-50 parts of treated aluminum ash, 8-15 parts of alpha-aluminum oxide, 5-10 parts of magnesia and 30-40 parts of kaolin, 50-60 parts of wood chips and 3-5 parts of a binding agent; wherein the sum of the parts by weight of the treated aluminum ash, the alpha-aluminum oxide, the magnesia and the kaolin is 100; the treated aluminum ash is a product obtained after secondary aluminum ash is hydrolyzed and calcined, the content of AlN in the secondary aluminum ash is larger than or equal to 30 wt%, and the content of AlN in the treated aluminum ash is smaller than or equal to 3 wt%. The heat-insulating brick disclosed by the invention is small in volume density, good in thermal shock resistance and low in production cost.

This invention discloses a negative carbon lightweight aggregate based on CO2 mineralization of coal-based solid waste and its preparation method, belonging to the technical field of solid waste resource utilization and low-carbon building materials. The method uses coal-based solid waste such as fly ash and coal slag as main raw materials, introducing uniform micropores through spray granulation with a trace amount of hydrogen peroxide solution. After pre-curing and drying, it is then mineralized and solidified using a low-concentration CO2 atmosphere. This method eliminates the need for cement or other cementing materials, resulting in low cost and no indirect carbon emissions. Furthermore, by synergistically controlling the hydrogen peroxide foaming and CO2 mineralization enhancement processes, the bulk density of the aggregate is significantly reduced; the resulting aggregate has a low bulk density (630~860 kg / m³). 3 With a compressive strength of 4.1~6.0MPa and a water absorption rate of 14~20%, it can meet the requirements of super high-rise buildings, large-span structures, prefabricated components, and the reinforcement and renovation of old buildings, significantly increasing the applicability and economy of coal-based solid waste lightweight building aggregate.

The application discloses a heat-preservation and heat-insulation composite tin bath top cover brick and a preparation method thereof, and belongs to the technical field of heat-insulation brick preparation. The application comprises the following raw material components in parts by weight: 80-100 parts of modified refractory material, 15-20 parts of heat-resistant aerogel, 10-15 parts of composite binder, 5-8 parts of water glass and 8-10 parts of silica sand. In the process of preparing heat-resistant fibers by electrostatic spinning, conductive carbon black is introduced to improve the process efficiency, then the carbon structure is removed by calcination, and hydroxyl groups are introduced to improve the contact area and reaction activity of the heat-resistant fibers and the remaining materials, and the hydroxyl groups are used as the filling structure of the heat-resistant aerogel, the modified refractory material and the composite binder to improve the composite performance of the materials. After mixing and pressing, the lightweight, high-temperature deformation-resistant and compression-resistant heat-preservation and heat-insulation composite top cover brick is obtained.

The present invention discloses a composition for reducing the bulk density of quartz sand and a preparation process thereof. The composition comprises 800-1200 parts of 40-70 mesh activated quartz sand, 8-10 parts of modified epoxy resin, 30-50 parts of powder, 1-3 parts of curing agent and 0.5-1.5 parts of calcium stearate in parts by weight. The present invention adopts a composition for reducing the bulk density of quartz sand of the above structure and a preparation process thereof. By surface treating the quartz sand, artificial micro-nano protrusions are formed on the surface of the quartz sand, and the accumulated volume of the quartz sand is increased without affecting the sphericity, thereby reducing its bulk density. The bulk density of the quartz sand after treatment is increased from 1.5g / cm 3 Reduced to 1.4g / cm 3 Below, the reduction is more than 6%.

The application provides a kind of polyimide prepolymer resin containing silicon and Cardo structure and a preparation method thereof, and belongs to the field of material science.The preparation method is as follows: firstly, a mixture of a synthesized structure-symmetrical diamine monomer containing silicon and Cardo structure, a commercially available structure-symmetrical dianhydride monomer and an active end-capping agent is subjected to a polymerization reaction in a suitable organic solvent;secondly, a thermosetting polyimide resin glue liquid containing a dehydration cyclization is obtained;finally, a post-treatment is performed to obtain a target product, and the molecular structure is as follows:the application has a wide melt processing window, low melt viscosity and good melt stability;no crosslinking agent needs to be added during crosslinking and curing, no volatile substances are generated, and the synthesized resin has few defects;the performance can be adjusted and controlled, has good processing technology, is low in cost and easy to industrialize.

This invention relates to the field of new yarn materials technology, and more particularly to a thermally insulating biodegradable PLA napped composite yarn and its preparation method. The yarn uses core-sheath structure PLA filaments as the base yarn, with a core layer of PLA and a sheath layer of low-melting-point PLA or copolymer PLA. The monofilament cross-section is irregular and / or hollow. Air blowing is used to form loop / arc loop pile structures on the surface of the base yarn. Subsequently, under restricted shrinkage conditions, the pile is locked and shaped, with the locking temperature controlled above the sheath softening temperature and below the core melting peak, causing the sheath to soften locally at the contact points to form point-bonding locking points to fix the pile. The pile height quantile, coefficient of variation, and bulk index are detected online, and the airflow, feed difference, and shaping parameters are adjusted in a closed loop to achieve structural and performance stability during continuous production. This solution combines high bulk, high warmth retention, washability retention, and batch consistency.

The present invention relates to the technical field of catalyst carrier materials, and in particular to a catalyst carrier with a high specific surface area and a preparation method thereof, comprising the following steps: (1) dissolving an aluminum salt, hydroxypropyl-β-cyclodextrin, and a first polyvinyl alcohol in deionized water to obtain an aluminum salt mixed solution; (2) dissolving aluminate and a second polyvinyl alcohol in deionized water to obtain aluminate mixed solution; (3) heating the aluminum salt mixed solution, and dripping the aluminate mixed solution to obtain a mixed reaction solution; (4) heating the mixed reaction solution to react to obtain a precipitate; and (5) calcining to obtain a catalyst carrier with a high specific surface area. Polyvinyl alcohol and hydroxypropyl-β-cyclodextrin work together to prepare precursors with different particle sizes and morphologies, effectively reducing the bulk density, increasing the porosity and pore size of alumina, and further increasing its specific surface area.

The invention provides a graphene oxide separation membrane with a multilevel structure as well as a preparation method and application of the graphene oxide separation membrane. The preparation method comprises the following steps: step 1, preparing a large graphene oxide dispersion liquid and a small graphene oxide dispersion liquid; step 2, carrying out hydrothermal reflux treatment on the large graphene oxide dispersion liquid; 3, sequentially loading the treated large graphene oxide and small graphene oxide on a hydrophilic ultrafiltration membrane or an ultrafiltration membrane subjected to hydrophilization treatment to obtain a composite membrane; and 4, carrying out plasma treatment on the composite membrane obtained in the step 3, and carrying out third spraying on the composite membrane to load small pieces of graphene oxide so as to obtain the graphene oxide separation membrane with the multilevel structure. The preparation method provided by the invention solves the problem of mutual restriction of separation performance and permeability of the graphene oxide membrane, so that the composite membrane has the advantages of good permeability, developed pore structure, small volume density, large specific surface area and pore volume and the like.

The invention relates to an organic pollution purification capillary tube and a preparation method thereof, and belongs to the field of water pollution purification materials. According to the method, the polyester fiber is used as a template material, the surface of the polyester fiber is carbonized, and then the polyester fiber is removed in the capillary shaping process, so that the one-dimensional linear capillary hollow pipe is formed. The organic pollution purification capillary tube is composed of samarium vanadate and has low stacking density. The organic pollution purification capillary tube not only can adsorb organic pollutants in water, but also can decompose the organic pollutants under an illumination condition, and can be stably used for purification treatment of the organic pollutants in wastewater for a long time.

According to the method, a bonding layer and a thermal barrier layer are arranged on an air supply pipeline base body, so that the surface temperature of the air supply pipeline is reduced, the burn-through possibility of a hot air pipeline is reduced, the heat loss of hot air is reduced, and the service life of the hot air pipeline is prolonged, and energy is saved; the bonding layer and the thermal barrier layer are sequentially attached to the pipeline base body, the thermal barrier layer comprises thermal insulation filler, and the thermal insulation filler is internally provided with a micropore structure; the thermal barrier layer containing the thermal insulation filler is arranged on the air supply pipeline, and the thermal insulation filler belongs to a high-filling-structure material and has the advantages of being small in heat conductivity coefficient, small in stacking density (a good thermal insulation effect can be achieved with small mass), small in surface area, high in weather resistance and the like. Air in the micropore structure cannot generate heat convection after being heated at high temperature, a stable and efficient heat shielding layer is formed in the thermal barrier layer, heat insulation of the thermal barrier layer is achieved, and then the energy-saving and service life prolonging effects of the air supply pipeline are improved.

The present application relates to the technical field of carbon material, and provides a carbon / carbon composite material, a preparation method thereof and a PECVD bearing frame. The carbon / carbon composite material is prepared by sequentially performing layering and needling on a carbon fiber web, obtaining a needled preform, and then performing first impregnation, mold pressing, first carbonization, second impregnation, second carbonization and graphitization treatment. The PECVD bearing frame can be obtained by fine machining of the carbon / carbon composite material. The present application uses a web as raw material, and is relatively cheap, belonging to a low-cost preparation process. Compared with the conventional graphite bearing frame and the common carbon / carbon bearing frame in the field, the PECVD bearing frame provided by the present application has lower bulk density and better mechanical properties, can adapt to the complex process environment of PECVD, has low replacement frequency and long service period.

The present invention discloses a preparation method and application of a composite oxide carrier, the preparation method comprising the following steps: Step 1): taking Al2O3 powder and M x O y The powder and the pore-forming agent are mixed uniformly; step 2): the uniform mixture is put into a bag and vacuumized; step 3): the bag is vacuum-sealed and placed in a heating reactor, and the reactor is sealed and filled with inert gas, and molding and sintering are completed under the combined action of high temperature and high pressure; step 4): after the heating reactor is cooled to room temperature, the bag is removed to obtain a composite oxide molded product; step 5): the molded product is placed in an infrared heater for heating; step 6): the molded product treated in step 5) is crushed to obtain composite oxide carrier particles. The present invention provides an application of the prepared composite oxide carrier in the preparation of a catalyst for the selective hydrogenation of acetylene, and the catalyst can achieve high acetylene conversion, high ethylene selectivity and good stability.

This invention discloses a flux for double-wire submerged arc deep penetration welding of H-beams, its preparation method, and welding method. The flux raw materials include magnesite, wollastonite, white corundum, manganese oxide powder, mica, kaolin, titanium diboride powder, zircon, and scandium oxide powder. The flux composition, by mass percentage, includes: MgO: 10%–25%; Al2O3: 25%–40%; SiO2: 15%–30%; P: ≤0.02%; S: ≤0.02%; K2O: ≤3%; CaO: 3%–10%; TiB2: 1%–5%; MnO: 6%–10%; Fe2O3: 1%–6%; ZrO2: 3%–8%; Sc2O3: 1%–3%. The flux of this invention protects the weld metal from harmful gases in the surrounding atmosphere when it is in the liquid state, eliminating welding defects such as porosity, slag inclusions, undercut, and cracks, ensuring full penetration of the web, good fusion of the flanges and weld formation, and improving the strength and toughness of the weld by transition alloying elements.

The application belongs to the field of inorganic filler preparation, and particularly relates to a preparation method of full-hollow silicon carbide microbeads, which comprises the following steps: preparing a sol: mixing and stirring nano carbon black, a modifier and silica sol according to mass percentages to obtain the sol, wherein the nano carbon black accounts for 20-40%, the modifier combination accounts for 1-5%, and the silica sol accounts for 30-90%; and preparing dry gel hollow microbeads: drying the sol obtained in step S1 in a spray dryer, the application optimizes the specific surface area and surface functional groups of the nano carbon black, combines a carbon-rich layer formed by carbonization of phenolic resin coating, greatly increases the contact area and reactive sites of the carbon black and silicon, and meanwhile, the ratio of high-purity spherical silicon powder to the carbonized microbeads and the addition of a dispersing agent avoid the agglomeration of the silicon powder, so that the liquid-phase silicon is quickly impregnated and reacts with carbon through capillary action during sintering, the silicon-carbon reaction rate is improved, and the high-temperature sintering energy consumption per unit product is reduced.

The invention discloses a UHPC heat preservation and decoration integrated board and a preparation method thereof.The UHPC heat preservation and decoration integrated board is of a sandwich structure composed of a UHPC decoration board, a thermosetting composite polystyrene particle heat preservation layer (A-level flame retardant) and a UHPC structural board, the heat conductivity coefficient is 0.035 W / m.K to 0.050 W / m.K, and the UHPC heat preservation and decoration integrated board has excellent heat insulation performance and can reach the A-level fireproof grade. The invention solves the problem that the fireproof performance of the existing partial building insulation and decoration integrated plate still needs to be improved.