1907 results about "Aluminium hydroxide" patented technology

The invention discloses a process and system for recovering phosphorus and fluorine from ardealite leachate, which comprises the following steps: feeding the ardealite leachate into an induced crystallization reactor for induced crystallization, discharging generated large-particle fluorapatite crystals from a crystal discharge port at the bottom of the induced crystallization reactor, and collecting and recycling; aluminum hydroxide flocs and fine-particle fluorapatite crystals enter a cyclone separator along with the effluent, the fine-particle fluorapatite crystals are separated and then flow back to the induced crystallization reactor, the aluminum hydroxide flocs form precipitates in the flocculation sedimentation tank through flocculation to be removed, and the effluent of the flocculation sedimentation tank enters a multi-stage treatment system. According to the method disclosed by the invention, fluorine and phosphorus in the phosphogypsum leachate are recovered together, the recovered fluorapatite finished product is high in purity and can be recycled, and the amount of chemical sludge is also greatly reduced, so that the treatment cost of the sludge is reduced.

The invention relates to the technical field of cables, and provides a fireproof flame-retardant 10kV power cable and a preparation method thereof. The fire-resistant flame-retardant 10kV power cable comprises a conductor and a fire-resistant flame-retardant layer, the fireproof flame-retardant layer is prepared from the following raw materials in parts by weight: 35 to 45 parts of linear low-density polyethylene, 40 to 50 parts of ethylene-vinyl acetate copolymer, 25 to 30 parts of modified aluminum hydroxide, 5 to 8 parts of polyethylene grafted maleic anhydride, 10 to 12 parts of phosphate modified halloysite nanotube, 5 to 8 parts of ZIF-8 loaded zinc borate core-shell particles, 15 to 20 parts of magnesium hydroxide and 2 to 3 parts of silane coupling agent. 0.5 to 1 part of antioxidant, 0.5 to 1 part of calcium stearate and 1 to 1.5 parts of polyethylene wax. According to the cable prepared in the invention, the situation that a conductor is exposed and the fire resistance is lost due to cracking and falling under long-time high-temperature baking is avoided; the continuous effectiveness of the flame retardant at high temperature is improved.

The invention provides a tear-resistant, wear-resistant, low-smoke and non-dripping sheath material as well as a preparation method and application thereof. The tear-resistant wear-resistant low-smoke non-dripping sheath material is prepared from the following components in parts by weight: 25 to 35 parts of metallocene linear low-density polyethylene, 10 to 15 parts of ethylene-vinyl acetate copolymer, 6 to 8 parts of compatilizer, 50 to 60 parts of aluminum hydroxide, 10 to 15 parts of magnesium hydroxide, 3 to 4 parts of microencapsulated red phosphorus, 5 to 8 parts of lithium oxide synergist, 4 to 6 parts of silicone master batch, 0.3 to 0.7 part of carbon black master batch and 1.5 to 2.5 parts of coupling agent. The tear-resistant wear-resistant low-smoke non-dripping sheath material provided by the invention has the characteristics of being halogen-free, flame-retardant, tear-resistant and wear-resistant, and a low-smoke halogen-free flame-retardant power cable prepared from the sheath material has the characteristics of high smoke light transmittance during combustion, no dripping and cracking resistance.

The invention discloses an environment-friendly high-strength water-stop belt and a preparation method thereof, and relates to the technical field of high-molecular compound composition water-stop belts. The environment-friendly high-strength water-stop belt is prepared from the following components in parts by mass: 100 parts of ethylene propylene diene monomer, 40 to 70 parts of reinforcing filler, 10 to 25 parts of environment-friendly plasticizer, 1 to 5 parts of interface modifier, 1.5 to 3.5 parts of vulcanizing agent, 3 to 8 parts of active agent, 1 to 3 parts of anti-aging agent and 5 to 15 parts of flame retardant. White carbon black and calcium carbonate are adopted as reinforcing filler to replace traditional carbon black, and energy consumption and pollution emission in the production process are remarkably reduced. By optimizing the formula and the preparation process, the tensile strength, the elongation at break, the tearing strength and other mechanical properties of the waterstop are remarkably improved. Aluminum hydroxide is added as a flame retardant, absorbs heat during thermal decomposition and forms a barrier layer, so that oxygen is effectively diluted, and fire spreading is prevented.

The invention discloses a PA6 nylon composite material for a high-temperature-resistant filter screen and a preparation method of the PA6 nylon composite material, and relates to the technical field of composite materials. The invention discloses a PA6 nylon composite material for a high-temperature-resistant filter screen. The nylon material is prepared from the following raw materials in parts by weight: 60 to 80 parts of modified PA6 nylon, 10 to 20 parts of modified glass fiber, 2 to 5 parts of montmorillonite, 0.3 to 0.8 part of antioxidant 1010, 0.2 to 0.6 part of stearic acid, 0.5 to 1.0 part of ethoxylated fatty amine, 1 to 3 parts of nano titanium dioxide, 1 to 3 parts of polytetrafluoroethylene micro powder, 3 to 8 parts of aluminum hydroxide, 0.5 to 1.5 parts of chitosan, 1 to 3 parts of hyperbranched polyamide and 0.5 to 1.5 parts of urea-formaldehyde resin coated epoxy resin microcapsules. And 0.3 to 0.8 part of sodium polyacrylate. The PA6 nylon composite material for the high-temperature-resistant filter screen has remarkable advantages. The material disclosed by the invention is high in mechanical property, good in thermal stability and stable in size at high temperature; the self-cleaning, antibacterial and antistatic functions are realized, and the filtering efficiency is high; chemical corrosion resistance, wear resistance and low water absorption are achieved; part of the raw materials can be recycled, the environmental protection concept is met, and the use requirement of the high-temperature-resistant filter screen in a complex environment can be met.

The invention discloses a preparation method of a fly ash-Al-MOF material loaded with sodium percarbonate and acid-containing ferrous sulfate, which comprises the following steps: carrying out heat treatment on fly ash, cooling, adding into a sulfuric acid solution, stirring and mixing, carrying out solid-liquid separation, adding sodium hydroxide into a liquid product to adjust the pH value to 4.5-6 to obtain an aluminum hydroxide precipitate, washing and roasting to obtain aluminum oxide, and drying to obtain the fly ash-Al-MOF material loaded with sodium percarbonate and acid-containing ferrous sulfate. The preparation method comprises the following steps: mixing fly ash-Al-MOF with a sulfuric acid solution to obtain an aluminum sulfate solution, uniformly mixing the aluminum sulfate solution with a phthalic acid solution, carrying out solid-liquid separation, washing a solid product, carrying out freeze drying to obtain fly ash-Al-MOF, and respectively loading sodium percarbonate and acid-containing ferrous sulfate on the fly ash-Al-MOF to obtain fly ash-Al-MOF loaded with sodium percarbonate and fly ash-Al-MOF loaded with acid-containing ferrous sulfate; and uniformly mixing the two components to obtain a finished product. Compared with the existing method, the material prepared by the invention can realize long-term, stable, effective and environment-friendly remediation of the organic polluted soil, and the remediation efficiency is high.

The invention relates to the technical field of cable coating materials, and particularly discloses a B1-grade cable material as well as a preparation method and application thereof. The cable material provided by the invention comprises matrix resin, a compatilizer, a flame retardant, a lubricant, an antioxidant, a smoke suppression charring agent, nano silicon dioxide and a silane coupling agent, the matrix resin is a mixture of linear low density polyethylene resin, an ethylene-octylene copolymer, metallocene polyethylene and an ethylene-vinyl acetate copolymer; the flame retardant is a mixture of magnesium hydroxide, aluminum hydroxide and hydrotalcite; the smoke suppression charring agent is a mixture of hydrous magnesium silicate and modified montmorillonite; the silane coupling agent is a mixture of vinyl silane and diamino silane. According to the cable material provided by the invention, the specific matrix resin, the flame retardant, the smoke suppression charring agent and the silane coupling agent are combined with auxiliaries such as the compatilizer, the lubricant, the antioxidant and the nano silicon dioxide to serve as raw materials, so that the flame-retardant effect of the B1-grade cable material is greatly improved.

The invention discloses an anti-aging water-stop belt and a preparation method and application thereof, and relates to the technical field of water-stop belts. The invention relates to an anti-aging water-stop belt which is prepared from the following raw materials in parts by mass: 40-60 parts of chloroprene rubber, 10-20 parts of natural rubber, 10-20 parts of ethylene propylene diene monomer, 15-30 parts of carbon black, 5-15 parts of white carbon black, 5-15 parts of a plasticizer, 0.5-2 parts of sulfur, 0.5-1.5 parts of an accelerant, 1-2 parts of an anti-aging ultraviolet light absorber, 5-15 parts of aluminum hydroxide, 1-3 parts of stearic acid and 3-8 parts of zinc oxide. The obtained water-stop belt has excellent ultraviolet aging resistance, ozone resistance and chemical corrosion resistance while keeping high elasticity, the mechanical stability of the water-stop belt is remarkably improved compared with that of a traditional product, the water-stop belt is suitable for joint sealing in harsh environments such as bridges, tunnels and water conservancy projects, and the waterproof service life of engineering structures can be effectively prolonged.

The invention discloses an environment-friendly flame-retardant medium-voltage cable, and relates to the technical field of cables, the outer side of an inner conductor is provided with a flame-retardant protection assembly, the flame-retardant protection assembly comprises flame-retardant filling bodies, the middle parts of the opposite side surfaces of the adjacent flame-retardant filling bodies are provided with supporting grooves, and arc-shaped spring plates are adhered to the interiors of the supporting grooves. The outer side of the cable is extruded and collided, the impact force is attenuated layer by layer, the situation that the cable is damaged due to collision and impact is reduced, when the outer side of the cable is frozen, the heating wire emits heat, and the cable is prevented from being damaged. When the cable is deiced, the inflatable strip outside the insulating middle layer is uniformly heated, the outer insulating layer is pushed to bulge, and the ice layer outside is jacked open, so that the ice layer is broken and falls off, and compared with the conventional deicing method which only depends on heating, the energy consumption is lower, the cable is environment-friendly and energy-saving, the deicing effect is better, and the cable is more favorably protected.

The invention belongs to the field of grouting materials, and discloses a composite grouting material as well as a preparation method, a construction method and application thereof. The composite grouting material comprises the following components: sulphoaluminate cement clinker powder, Portland cement clinker powder, a reinforcing agent, a coagulant and a modifier, the reinforcing agent comprises superfine mineral powder, superfine fly ash, silica fume and calcium sulfate whiskers; the coagulant comprises alumina clinker powder, calcium hydroxide, lithium carbonate and aluminum hydroxide; the modifier comprises a shrinkage reducing agent, a thickening agent, a water reducing agent and a retarder. The composite grouting material has the advantages of being good in pumpability, short in gelation time, free of plastic shrinkage, high in early strength, good in volume stability, high in durability, appropriate in price, environmentally friendly, free of toxicity and the like, and the requirement for rapid grouting maintenance is met in the subway operation window period.

The invention relates to the technical field of insulating materials, in particular to insulating powder and a preparation method thereof. The invention discloses a flame-retardant coating which comprises the following components in parts by weight: 15-25 parts of epoxy resin, 10-20 parts of aluminum hydroxide, 5-12 parts of nano boron nitride, 1-3 parts of a silane coupling agent KH-560, 3-8 parts of polytetrafluoroethylene micro powder, 2-6 parts of fluorine-modified montmorillonite, 4-9 parts of melamine cyanurate, 2-5 parts of nano titanium dioxide, 1-4 parts of a fluorine-modified graphene oxide-polyaniline composite material and 0.5-2 parts of pentaerythritol stearate. The anti-corrosion coating is prepared from the following components in parts by weight: 1 to 3 parts of nano zinc oxide, 5 to 10 parts of glass fiber, 2 to 5 parts of polyhedral oligomeric silsesquioxane-polyimide copolymer, 1 to 4 parts of ferrocenyl epoxy resin and 0.5 to 2 parts of perfluorooctyltriethoxysilane. The insulation powder is high in corrosion resistance, excellent in insulation, heat dissipation and mechanical performance, environmentally friendly in processing, good in adaptability, capable of prolonging the service life of equipment and reducing the cost, suitable for special environments and wide in popularization prospect.

The invention belongs to the technical field of fireproof materials, and particularly relates to a non-intumescent fireproof coating for a fiber reinforced composite material as well as a preparation method and application of the non-intumescent fireproof coating. A binder in preparation raw materials of the non-intumescent fire retardant coating comprises metakaolin, fly ash, CA80 high-alumina cement and an exciting agent, or comprises metakaolin, fly ash, CA80 high-alumina cement, an exciting agent and an organic matter binder, the organic matter binder comprises redispersible latex powder and / or polyvinyl alcohol powder, and the organic matter binder comprises silica powder and / or silica powder. The heat insulation filler comprises expanded vermiculite, hydrophobic modified expanded perlite, sepiolite and hollow glass beads, the flame retardant comprises aluminum hydroxide and magnesium hydroxide, the fibers comprise glass fibers, and the auxiliaries comprise a foaming agent, a thickening agent, a foam stabilizer and an acrylic emulsion. The formed coating has the advantages of low carbon, low cost, excellent heat insulation performance and high-temperature strength, can be applied as a fire retardant coating of a fiber reinforced plastic (FRP), and can effectively protect an FRP reinforcing system.

The invention relates to an aluminum hydroxide flame retardant, in particular to a modification method of white carbon black, intrinsic flame-retardant white carbon black and a flame-retardant composite rubber material. According to the modification method disclosed by the invention, hydrogen on hydroxyl of the white carbon black is replaced by aluminum hydroxide, so that the aluminum hydroxide is grafted on the white carbon black microspheres by adopting a chemical action, and the occurrence of an agglomeration behavior after the aluminum hydroxide is added into a rubber matrix material is greatly reduced. Therefore, when the intrinsic flame-retardant white carbon black obtained by the modification method disclosed by the invention is used, ideal flame retardance can be achieved only by adding a small amount of the intrinsic flame-retardant white carbon black into a rubber matrix material. In addition, the intrinsic flame-retardant white carbon black obtained by the modification method can effectively improve the mechanical property of a rubber matrix. The modification method disclosed by the invention is simple and convenient in steps, required equipment, such as a stirrer and the like, is relatively common, does not need special environmental conditions, and has large-scale production capacity.

The invention provides a method for synergistically recovering all elements of crystal silicon cells of a decommissioned photovoltaic module, which comprises the following steps of: collecting large-particle waste crystal silicon cells and grinding the large-particle waste crystal silicon cells to obtain powder; the powder is leached with nitric acid, and leach liquor and impurity-removed silicon powder are obtained; leaching the silicon powder subjected to impurity removal by using an HF solution to remove a silicon nitride layer, and filtering, washing and drying to obtain the silicon powder meeting the industrial standard; the leaching solution is subjected to chlorination precipitation to obtain silver chloride and a leaching solution with silver removed, and after the silver chloride is filtered, the silver chloride is subjected to acid pickling and water washing to obtain silver chloride; sodium sulfide is added into the leaching solution after silver removal, metal in the leaching solution is precipitated, and a solution containing Al < 3 + > can be obtained after filtering; the method comprises the following steps: adding an alkaline substance into a solution containing Al < 3 + >, filtering to obtain an aluminum hydroxide precipitate, and washing the aluminum hydroxide precipitate to remove foreign ions adsorbed on the surface; one technical effect of the invention is that collaborative recovery and treatment of each element in the waste crystal silicon battery piece are realized.

The invention discloses a plastic fireproof material for extrusion. The invention belongs to the technical field of plastic particles capable of reaching the fireproof grade A (non-combustible grade), magnesium hydroxide, aluminum hydroxide and other additives are reasonably added into the PE plastic particles, the fireproof grade A non-combustible grade standard is successfully reached, compared with existing plastic particles only capable of reaching the fireproof grade B, the fireproof safety is remarkably improved, and the service life of the plastic particles is prolonged. The cable can be widely applied to places with strict fireproof requirements, and the fire risk is effectively reduced; the raw materials are subjected to constant-temperature drying treatment in the pretreatment process, so that the raw materials flow and fill a mold more easily in the injection molding process, the production efficiency is improved, the quality and performance of a final product can be ensured, the defects of yellowing, silver wires, bubbles, shrinkage cavities and the like of the product are avoided, and the yield of the product is improved.

The invention belongs to the field of coal gangue resource utilization, and particularly discloses a method for separating and recovering silicon and aluminum elements from coal gangue. The coal gangue is used as a raw material, and efficient resource utilization of the coal gangue is realized through crushing and ball milling, high-temperature roasting activation and acid-base combined treatment. The coal gangue is subjected to high-temperature fluorination roasting by adopting an activating auxiliary agent fluorinating agent to form soluble fluosilicate (H2SiF6) and a fluorine-aluminum compound (AlF3), so that the subsequent silicon-aluminum separation is obviously promoted. The method comprises the following steps: desiliconizing through alkali treatment, leaching and converting silicon in the coal gangue into sodium silicate, and carrying out solid-liquid separation to obtain sodium silicate filtrate and aluminum-rich leaching residues; and then acid treatment is conducted on the aluminum-rich leaching residues, aluminum salt or aluminum hydroxide is prepared, and finally efficient separation of silicon and aluminum is achieved. According to the method, through high-temperature activation roasting, the normal-pressure alkaline leaching desiliconization effect is improved, the acid extraction aluminum efficiency is remarkably improved, the advantages of an acid method and an alkaline method are effectively combined, and the problems that coal gangue resources are difficult to utilize and the resource recovery rate is low are solved.

The invention relates to a low-smoke halogen-free flame-retardant polyolefin insulation material for an in-vehicle high-voltage cable. The low-smoke halogen-free flame-retardant polyolefin insulation material comprises the following raw materials in parts by mass: 30-50 parts of SEBS, 30-50 parts of an ethylene-propylene-butylene block copolymer elastomer, 10-20 parts of a polyethylene grafted maleic anhydride compatilizer, 3-5 parts of color master batch, 1.5-2.5 parts of an antioxidant, 110-130 parts of aluminum hydroxide, 1.5-3 parts of phosphorus-containing silane, 1-2 parts of a cross-linking agent and 3-5 parts of silicone master batch. The SEBS is in the form of an unoil-filled particle; the aluminum hydroxide is powdery and is modified by phosphorus-containing silane; the cross-linking agent is a polyfunctional group cross-linking sensitizer, and the number of functional groups is not less than 2. The preparation method of the insulating material comprises the following steps: S1, modifying aluminum hydroxide powder by using phosphorus-containing silane; s2, uniformly mixing the matrix resin; s3, granulating by adopting a double-screw extruder with a large length-diameter ratio; s4, the materials obtained in the step S3, the materials obtained in the step S1 and other raw materials are subjected to banburying and double-stage production granulation, and a finished product is obtained.

The invention discloses a flame-retardant semi-solid gel electrolyte and a preparation method thereof, and the flame-retardant semi-solid gel electrolyte comprises the following raw materials in parts by weight: 100-120 parts of PVDF resin, 25-30 parts of PPC resin, 5-10 parts of modified hollow ceramic fiber, 3-5 parts of modified nano aluminum hydroxide, 15-20 parts of an organic solvent, and 4-6 parts of a conductive agent. The modified hollow ceramic fiber is a Li0. 5La0. 5TiO3 hollow ceramic fiber subjected to surface grafting modification by 3-aminopropyltrimethoxysilane, the modified nano aluminum hydroxide is an antioxidant flame retardant grafted modified nano aluminum hydroxide, and the antioxidant flame retardant is a triazine derivative containing a hindered phenol structure and a DOPO (9, 10-dihydro-9-oxa-10-phosphaphenanthrene-10-oxide) structure. According to the flame-retardant semi-solid gel electrolyte disclosed by the invention, the gel strength of the flame-retardant semi-solid gel electrolyte is improved, meanwhile, the ionic conductivity of the flame-retardant semi-solid gel electrolyte is improved, and the flame-retardant property and the thermal stability of the flame-retardant semi-solid gel electrolyte are improved by adding the modified nano aluminum hydroxide.

The invention discloses a preparation method of a high-adsorbability aluminum hydroxide adjuvant for livestock, which comprises the following steps: when an aluminum chloride solution reacts with alkali liquor, generating a colloidal suspension by combining pH two-step adjustment with dispersant addition; and after instant high-speed shearing and room-temperature aging, performing ultrafiltration purification to remove salts, and finally performing moist heat sterilization to obtain the suspension morphological adjuvant. The adjuvant is high in antigen adsorption rate, low in 72-hour desorption rate, large in specific surface area, uniform in particle and suitable for vaccines of pigs, cattle and poultry, and the problems that a traditional adjuvant is low in adsorption rate and poor in stability are solved.

The invention provides a large-aperture alumina carrier as well as a preparation method and application thereof. The large-aperture alumina carrier is prepared from dry materials and water, and the dry materials comprise inert fibers, aluminum hydroxide and ammonium aluminum carbonate. According to the invention, under the condition of low water-powder ratio, primary pores and secondary accumulation pores in aluminum hydroxide and ammonium aluminum carbonate are reserved to the greatest extent under high extrusion pressure in the carrier extrusion and molding process due to the enhancement effect of inert fibers; although the apertures of the primary pores, the secondary accumulation pores and the macropores generated by decomposition of the ammonium aluminum carbonate are reduced during roasting of the carrier, the volume ratio of the pores with the pore size of more than 500nm in the final carrier is still obviously increased due to the existence of the inert fibers, and the volume ratio of the pores with the pore size of more than 500nm is 15-25%. In addition, the by-product ammonium aluminum carbonate generated in the recovery process of the waste ethylene oxide catalyst is used as the raw material and the macroporous pore-enlarging agent, so that the production cost of the large-aperture alumina carrier is reduced. The prepared large-aperture alumina carrier can be used for preparing a residual oil hydrodemetallization catalyst.

The invention relates to the technical field of cables, and provides a high-strength mining cable. Comprising a wire core and a sheath layer wrapping the surface of the wire core. The sheath layer is prepared from the following raw materials in parts by weight: 75 to 85 parts of polyvinyl chloride resin, 25 to 35 parts of chloroprene rubber, 20 to 30 parts of ethylene-vinyl acetate copolymer, 26 to 28 parts of core-shell SiO2 (at) BN composite material, 14 to 16 parts of silane coupling agent modified calcium carbonate, 8 to 10 parts of carbon black, 4 to 6 parts of magnesium oxide, 10 to 15 parts of aluminum hydroxide, 5 to 7 parts of magnesium hydroxide, 0.5 to 1.5 parts of antioxidant, 0.8 to 1.2 parts of vulcanizing agent and 0.7 to 0.9 part of auxiliary vulcanizing agent. According to the high-strength mining cable prepared in the invention, the wear resistance and acid and alkali resistance of the mining cable are enhanced, and the mining cable has certain fireproof and flame-retardant properties.

The invention belongs to an aluminum fluoride production technology, and particularly relates to a process and a system for producing aluminum fluoride by matching with a low-grade fluorite dry method, fluorite powder and sulfuric acid are added into a pre-reactor to be uniformly mixed and then are guided into a reaction furnace to be heated, and when the reaction furnace rotates, a free spiral structure in the reaction furnace rotates to promote the reaction of the fluorite and the sulfuric acid; discharging the calcium sulfate through a discharging spoon at the discharging end of the reaction furnace, and collecting the hydrogen fluoride volatilized from the reaction furnace; volatilized hydrogen fluoride enters a pre-purification tower and is treated to obtain purified hydrogen fluoride gas, the purified hydrogen fluoride gas and dried aluminum hydroxide are added into a fluidized bed to react to obtain aluminum fluoride and tail gas, and the tail gas enters a tail gas recovery treatment system. The problems that low-grade fluorite is poor in resource utilization rate, prone to crusting in a reaction furnace, low in fluorine utilization rate and the like are solved.

The invention provides a high-carbon-layer-strength intumescent fireproof coating for a steel structure. The high-carbon-layer-strength intumescent fireproof coating for the steel structure is prepared from the following components in parts by mass: 0.3 to 0.6 part of cellulose, 18 to 23 parts of phosphorus flame retardant, 3 to 6 parts of modified nano titanium dioxide, 3 to 5 parts of modified expandable graphite, 0.6 to 1.8 parts of modified glass fiber, 1 to 3 parts of aluminum hydroxide, 1 to 3 parts of boric acid, 20 to 25 parts of emulsion, 22 to 32 parts of additive and 29 to 43 parts of water, wherein the modified nano titanium dioxide is a silane coupling agent grafted nano titanium dioxide; the modified glass fibers are alkali-treated glass fibers; the modified expandable graphite is acid-treated expandable graphite. The intumescent fire-retardant coating for the steel structure has excellent carbon skeleton strength and carbon-steel adhesion strength, the structural integrity of the intumescent fire-retardant coating can be kept under severe conditions such as high temperature, burning and airflow jetting, and the practical application performance is improved.

The present invention provides a method for preparing large-pore spherical alumina, and relates to the technical field of spherical alumina. The preparation method of the present invention comprises the following steps: mixing pseudo-boehmite powder with water to obtain a suspension, adding a peptizing agent for peptization to prepare an aluminum hydroxide sol; adding cross-linking molecules to the aluminum hydroxide sol to form a system to be cross-linked; adding a cross-linking agent to the system to be cross-linked to obtain a sol containing a prepolymer; and subjecting the sol to oil-ammonia column molding, drying and roasting to obtain large-pore spherical alumina. The present invention adopts an oil-ammonia column molding method, which does not require the addition of a pore-expanding agent or new equipment, and the preparation process is simple and does not introduce new impurities, so it is suitable for industrial production. The large-pore spherical alumina prepared by the present invention has a pore volume of up to 0.60cm 3 / g or more, and can be used as a propane dehydrogenation catalyst carrier.

The invention discloses a solar photovoltaic cable sheath material and a tear-resistant photovoltaic cable, and belongs to the field of photovoltaic cable manufacturing. The sheath material comprises the following components in parts by weight: 70-120 parts of ethylene propylene rubber, 10-13 parts of crosslinked polyethylene, 3-7 parts of zinc oxide, 1-4 parts of stearic acid, 1-2 parts of paraffin, 2-5 parts of an anti-aging agent RD, 8-12 parts of zinc borate, 150-200 parts of a reinforcing agent, 10-12 parts of high abrasion furnace black, 9-13 parts of tricresyl phosphate, 9-13 parts of red phosphorus, 0.5-1 part of an accelerant TMTD, 3-5 parts of DCP and 1-2 parts of HVA-2. The reinforcing agent composed of sodium silicate, ferric chloride and aluminum hydroxide is added into the sheath material, so that when the sheath material is damaged, sodium silicate and ferric chloride react under the influence of air moisture to generate colloidal silicic acid carrying ferric hydroxide and aluminum hydroxide, and the damaged part is filled with the colloidal silicic acid; and meanwhile, the aluminum hydroxide can promote the colloidal silicic acid to be dried, so that the damaged part is repaired, and the situation that the tear resistance of the cable is remarkably worsened due to damage is avoided.

The invention relates to the technical field of comprehensive treatment of industrial solid wastes, and particularly discloses a comprehensive utilization method of secondary aluminum ash, which specifically comprises the following steps: deoxidizing the secondary aluminum ash; carrying out hydrolysis treatment on the deoxidized secondary aluminum ash, and carrying out solid-liquid separation to obtain mixed gas, a hydrolysis slurry solid phase and high-salt-alkali ammonia nitrogen hydrolysate; separating and purifying the mixed gas to obtain hydrogen; carrying out at least two times of acid washing treatment and at least one time of alkali washing treatment on the hydrolyzed slurry solid phase to obtain a solid phase product for the concrete admixture; and carrying out ammonia-nitrogen separation on the high-salt-alkali ammonia-nitrogen hydrolysate, and carrying out gradient acidification treatment to obtain aluminum hydroxide and inorganic salt crystals. By implementing the method, high-added-value overall utilization of the secondary aluminum ash can be realized.

The invention discloses a perfluorohexanone fire extinguishing agent and a preparation method and application thereof.The perfluorohexanone fire extinguishing agent is prepared from, by mass, 60-70 parts of perfluorohexanone microcapsules, 10-20 parts of aluminum hydroxide, 6-10 parts of graphite, 5-10 parts of titanium dioxide, 4-8 parts of ultraviolet absorbent, 2-6 parts of ammonium polyphosphate, 3-6 parts of calcium oxide, 1-3 parts of fumed silica, 1-3 parts of nano-silica and 1-3 parts of trimethyl phosphate. According to the formula and process of the fire extinguishing agent, through triple technical innovation of shell layer modification, nano compounding and supercritical deposition, the breakthrough of efficient explosion suppression, long-acting anti-after-combustion, low toxicity and environment friendliness of the fire extinguishing agent is achieved, and the industrial popularization potential is achieved.

The invention relates to the technical field of vaccine adjuvants, and particularly discloses a preparation method of a nanoscale aluminum hydroxide adjuvant based on organic metal alkoxide hydrolysis. Aluminum isopropoxide is used as a precursor, and a hydrolysis interface is directionally regulated and controlled through a compound surfactant; a staged hydrolysis process is adopted, and a kinetic equation is met; and the surface is modified by a KH-550 coupling agent. According to the preparation method disclosed by the invention, boehmite phase crystallization, nanoscale uniformity and high antigen adsorption stability are synchronously realized at low temperature through alcoholate hydrolysis bond energy reconstruction, surface activity compounding interface regulation and control and staged kinetic control, and the bottlenecks of high temperature, high energy consumption and non-uniform particle size of a traditional process are overturned; and a novel industrial scheme with low consumption and high efficiency is provided for vaccine adjuvants.

The invention discloses novel environment-friendly flame-retardant corrugated paper and a preparation method thereof, and belongs to the technical field of paperboard products. The corrugated paper is formed by bonding upper surface paper, a V-shaped flame-retardant core base layer and lower surface paper through a flame-retardant adhesive; the flame-retardant adhesive is prepared from the following components in parts by weight: 50 to 65 parts of oxidized cassava starch, 12 to 23 parts of phosphate esterified urea-formaldehyde resin, 5 to 15 parts of nitrogen-phosphorus modified isocyanate-based polyurethane and 2 to 8 parts of nano aluminum hydroxide; wherein the nitrogen and phosphorus modified isocyanate-based polyurethane is prepared by carrying out a reaction on isophorone isocyanate, bisphenol A type monophenyl phosphonate and modified montmorillonite, and the modified montmorillonite is prepared by carrying out a reaction on montmorillonite and polysiloxane. The corrugated paper provided by the invention has excellent flame retardant property, and also has good chemical stability and mechanical properties.

Disclosed in the present invention are a 90°C thermoplastic halogen-free low-smoke flame-retardant polyolefin sheath material and a preparation method therefor. The sheath material is prepared from raw materials comprising the following components in parts by mass: 20-40 parts of an ethylene-vinyl acetate copolymer, 20-40 parts of a linear low-density polyethylene, 2-10 parts of a high-density polyethylene, 20-40 parts of a metallocene ethylene-octylene copolymer, 10-15 parts of a maleic-anhydride-grafted metallocene linear low-density polyethylene copolymer, 58-73 parts of aluminum hydroxide, 20-25 parts of modified magnesium hydroxide, 64-84 parts of a synergistic flame retardant, 2-3 parts of a coupling agent, 1-4 parts of a lubricant, 1-3 parts of an antioxidant, and 2-7 parts of a coloring agent, wherein the synergistic flame retardant comprises lithium oxide. A matrix resin has low-temperature performance, mechanical properties and cracking resistance. With regard to flame retardance, a large amount of the synergistic flame retardant, i.e., lithium oxide, is added to a traditional magnesium-aluminum compound flame-retardant system, and therefore an off-white hard shell can be formed during a combustion process while low heat release is ensured, thereby ensuring no dripping during the combustion process.