11results about How to "Small bulk density" patented technology

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 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 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 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.

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 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 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.

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 relates to the technical field of functional coatings, and discloses a non-ignition type bio-based bamboo fiber coating which is composed of inorganic cementing material, modified bamboo fiber, inorganic aggregate, conductive filler, defoaming agent, dispersing agent and water in a certain proportion. The modified bamboo fiber is immersed in a mixed solution of ammonium dihydrogen phosphate and boric acid and is coated with nano silicon dioxide sol, so that the coating has excellent flame-retardant performance; the conductive filler is compounded by nano tin antimony oxide and conductive mica powder; the coating takes natural bamboo fiber as a functional carrier, is green and environment-friendly, has excellent performance in three dimensions of non-ignition, anti-static and flame retardation.