220 results about "Potassium titanate" patented technology

The invention provides carbon fiber directionally-distributed high-thermal-conductivity airtight paste and a preparation method thereof, and belongs to the technical field of airtight paste. According to the invention, a high-efficiency heat-conducting network is constructed through the synergistic effect of various heat-conducting fillers, and the heat-conducting property, the mechanical property and the long-term stability of the composite material are remarkably improved; the potassium titanate whiskers are coated by silica sol and modified by a silane coupling agent to improve the interfacial compatibility and dispersity, and are uniformly distributed in a matrix to reduce interface defects; trimethyl hydroxyl phosphate and an epoxy reactive diluent are subjected to a synergistic reaction to prepare a functional auxiliary agent, so that the interface bonding force is enhanced, and the dispersity of the filler is optimized; metal salt and ethylenediamine tetraacetic acid are chelated, and polyethylene glycol 400 is introduced to form a flexible complex, so that the interface stability and the filler dispersion efficiency are improved; and the uniformity and continuity of the thermal conductivity network are optimized through the synergistic effect of the long and short carbon fibers and a directional arrangement strategy. The heat conduction efficiency, the mechanical property and the processing adaptability of the composite material are remarkably improved through the synergistic effect of various fillers and modification means.

The invention relates to the technical field of welding materials, and particularly discloses a high-temperature-resistant flux-cored wire containing rare earth elements and a preparation method of the high-temperature-resistant flux-cored wire. The high-temperature-resistant flux-cored wire containing the rare earth elements comprises a welding wire skin and a flux core. The flux core comprises the following raw materials of dehydrated rutile, dehydrated potassium feldspar, zircon sand, metal chromium powder, metal nickel powder, electrolytic manganese, ferrotitanium, ferro-aluminum, potassium cryolite, potassium titanate, sodium titanate, fine iron powder, yttrium-based iron alloy powder, atomized ferrosilicon, nitrided ferrochrome, bismuth oxide, auxiliaries and the balance reduced iron powder. The auxiliary agent is a mixture of a zirconium-iron alloy, a titanium-iron alloy and an aluminum-magnesium alloy. A specific alloy auxiliary is introduced into the flux core to protect stable transition of rare earth yttrium, yttrium and multiple components synergistically optimize the weld joint performance, 253MA heat-resistant steel is matched, slag and electric arc regulation and control components and a reasonable process are matched, and the welding quality of the welding wire is improved.

The invention discloses a green preparation method of a silicon-containing FeCo-based nano-alloy surface composite passivation film, which comprises the steps of pretreatment, passivation solution preparation, dipping film formation and post-treatment strengthening, and the passivation solution is a silane-tannic acid composite passivation solution; according to the step of dipping and film forming, the pretreated alloy is dipped into a passivation solution, and a uniform primary film is formed; performing heat treatment and curing on the primary membrane to form a Si-O-M covalent network; and the post-treatment strengthening is that a potassium fluotitanate solution is adopted for sealing treatment, and micropores of the film layer are filled. Through molecular-level compounding of silane and TA, the passivation film with compactness, flexibility and a self-repairing function is constructed; meanwhile, nano cerium oxide is introduced as a nano filler and a corrosion inhibitor, so that the corrosion resistance is synergistically improved; and a low-temperature water-based process is used in the whole process, so that thermal damage to the nano-alloy is avoided, large-scale production can be realized, the limitation of a single-component passivation film is broken through, and an efficient and green solution is provided for anti-corrosion treatment of the high-activity nano-alloy.

The invention relates to a high-heat-resistance and high-insulation two-component epoxy resin adhesive and application thereof, and belongs to the technical field of epoxy resin. The technical problem to be solved by the invention is to provide the high-heat-resistance and high-insulation two-component epoxy resin adhesive. The adhesive comprises a component A and a component B. The component A comprises bisphenol A epoxy resin, novolac epoxy resin, silicon carbide whiskers, potassium titanate fibers, boron phenolic resin and modified nano boron nitride. The component B is prepared from methylhexahydrophthalic anhydride, methyl tetrahydrophthalic anhydride, 2-phenylimidazole, modified aluminum oxide, polyimide micro powder and modified wollastonite. Through synergism of multiple materials, balance of heat conduction, insulation, mechanical strength and thermal stability of the adhesive is realized. Under high-frequency pulse voltage, the adhesive is long in electrical aging life. A gradient curing process is adopted for curing, complete reaction in each stage is guaranteed, and internal stress is reduced. The process fault tolerance is high, the environment compatibility is high, the cost is low, and the curing time is short.

The invention relates to the field of polypropylene composite materials, and particularly discloses a high-performance polypropylene composite material and a preparation method thereof. The high-performance polypropylene composite material is prepared from the following raw materials in parts by weight: 80 to 90 parts of polypropylene, 10 to 20 parts of polyethylene, 5 to 15 parts of glass fiber, 2 to 5 parts of nano clay, 0.5 to 1 part of coupling agent, 5 to 8 parts of potassium titanate whisker, 3 to 5 parts of heat-conducting filler and 1 to 3 parts of compatilizer. Through the synergistic effect of all the components, the prepared polypropylene composite material can be promoted to have relatively good strength and toughness, and meanwhile, the polypropylene material is endowed with heat-conducting property.

The invention provides a high-toughness austenitic stainless steel welding rod for 5Ni steel and a preparation method of the high-toughness austenitic stainless steel welding rod. The welding rod comprises a core wire and a coating coated on the surface of the core wire, and based on the total amount of the core wire, the core wire comprises the following components in percentage by mass: less than or equal to 0.09% of C, less than or equal to 0.15% of Si, 1.6-2.5% of Mn, 18.5-20.5% of Cr, 12.5-14.5% of Ni, 2.1-3.2% of Mo and 0.06-0.18% of Ti; 0.12-0.24% of Al, less than or equal to 0.007% of S, less than or equal to 0.008% of P, less than or equal to 0.006% of O, less than or equal to 0.001% of H, less than or equal to 0.012% of S + P, and the balance Fe and inevitable impurities. On the basis of the total amount of the coating, the coating comprises, by mass, 28-38% of carbonate, 15-20% of fluorite, 1-3% of lithium fluoride and sodium fluoride, 8-12% of synthetic mica, 3-6% of potassium silicotitanate, 2-4% of zircon sand, 9-15% of electrolytic manganese metal, 2-4% of ferrotitanium, 2-5% of passivated nickel-magnesium alloy, 1-3% of atomized ferrosilicon, 1-3% of lanthanum cerium fluoride, 1-3% of tungsten and molybdenum, 3-5% of nitrided ferrochromium and 1-2% of CMC. The welding rod is good in all-position welding controllability, extremely low in air hole sensitivity and excellent in low-temperature toughness, and can meet the requirements for high-quality and efficient welding of 5Ni steel.

The invention relates to the technical field of intermediate alloy metal materials, and provides a low-nitrogen vanadium-aluminum intermediate alloy and a preparation method thereof, and the low-nitrogen vanadium-aluminum intermediate alloy comprises the following components: 40-68 wt% of V, 0.001-0.003 wt% of N, and the balance of Al and inevitable impurities. The preparation method comprises the following steps: uniformly mixing raw materials of vanadium pentoxide powder and aluminum shots, charging the mixture into a furnace, carrying out exothermic smelting outside the furnace to obtain a vanadium-aluminum intermediate alloy semi-finished product, uniformly mixing potassium fluotitanate and nano carbon powder, putting the mixture as a grate-layer material at the bottom of a corundum crucible, charging the vanadium-aluminum intermediate alloy semi-finished product and the aluminum shots, and carrying out vacuum induction smelting, and the low-nitrogen vanadium-aluminum intermediate alloy is obtained. According to the preparation method provided by the invention, not only is the content of impurity nitrogen in the produced vanadium-aluminum intermediate alloy low, but also the production cost required by nitrogen removal is low.

The invention discloses a high-humidity-resistant high-barrier coating film and a preparation method thereof, and belongs to the technical field of polymer composite materials. The coating film comprises a base film and a coating layer, wherein the coating layer is prepared from a coating liquid containing an ethylene-vinyl alcohol copolymer, acetoacetyl modified polyvinyl alcohol, amino silane modified boron nitride nanosheets, hydroxyl modified potassium titanate whiskers, a water-based polyfunctional aziridine cross-linking agent and an epoxy silane coupling agent. A multi-phase synergistic system of a polymer matrix-nano material-cross-linked network is constructed, a three-dimensional barrier network is constructed by utilizing the synergistic effect of two-dimensional nanosheets and one-dimensional whiskers, and meanwhile, the number of hydrophilic groups is reduced through a specific cross-linking reaction, so that the barrier stability of the material in a high-humidity environment is remarkably improved. The film has excellent oxygen and water vapor barrier property, good mechanical strength, thermal stability and aging resistance, and can be widely applied to the field of high-end packaging of food, medicines and precise instruments.

The invention relates to the technical field of plastic steel, and particularly discloses an anti-impact plastic steel profile and a preparation method thereof. The anti-impact plastic steel profile is prepared from the following raw materials in parts by weight: 60-80 parts of polyvinyl chloride, 2-8 parts of a stabilizer, 6-10 parts of a filling agent, 9-15 parts of potassium octatitanate fiber, 10-20 parts of a toughening agent and 5-8 parts of calcium sulfate. The toughening agent comprises an inner core formed by a butyl acrylate cross-linked polymer and a polymethyl methacrylate shell; the preparation method comprises the following steps: uniformly stirring the polyvinyl chloride resin, the stabilizer, the filler and the calcium sulfate, raising the temperature to 110-120 DEG C, adding the flexibilizer and the modified potassium octa-titanate fiber, reducing the rotating speed to 600-800 rpm, stirring for 3-5 minutes to obtain a mixture, and carrying out melt blending extrusion molding to obtain the PVC profile. The composition can be used in the fields of house building, door and window manufacturing and the like, and has the advantages of high impact strength and good weather resistance.

The invention discloses a friction material, a brake pad and a preparation method of the brake pad. Comprising the following raw materials: 14-18 parts of modified phenolic resin, 10-15 parts of modified composite fiber, 4-7 parts of aramid fiber, 3-5 parts of rubber powder, 5-8 parts of steel fiber, 7-11 parts of graphite, 3-6 parts of aluminum oxide, 3-5 parts of silicon carbide, 4-6 parts of mica powder, 9-13 parts of potassium titanate whisker and 8-11 parts of barium sulfate. The modified composite fiber is prepared by the following steps: mixing basalt fiber and carbon fiber, coating lanthanum gadolinium oxide on the surface through hydrothermal reaction, modifying with silane, and finally reacting with 4, 5-diamino-2, 6-dimercaptopyrimidine. The friction material has the advantages of good mechanical properties, low wear rate, high thermal stability and stable friction coefficient, and is suitable for automobile brake pads.

The present invention belongs to the technical field of titanium metal processing waste acid treatment, and specifically relates to a method for regenerating titanium metal pickling waste liquid. The regeneration method comprises the following steps: adding a fluorosilicic acid solution to the titanium metal pickling waste liquid and mixing uniformly, then adding a potassium salt solution, stirring the reaction at room temperature, and centrifuging or filtering after the reaction is complete to separate the solid portion as a potassium fluorotitanate / potassium fluorosilicate complex; and the liquid portion as a regenerated titanium metal pickling liquid. The method of the present invention can significantly improve the titanium ion recovery rate without destroying the pickling liquid components. The titanium metal pickling waste liquid can be regenerated and reused, and has the advantages of good treatment effect and simple treatment process.

1. The name of the design product: stirring mixing equipment (potassium titanate powder). 2. The use of the design product: potassium titanate powder preparation stirring. 3. The design points of the design product: in shape. 4. The picture or photo that best indicates the design points: perspective drawing.

[Problem] The present invention provides a friction pair having excellent low-speed performance stability, comprising a disc brake pad having a friction material composed of a friction material composition and a stainless steel disc rotor. The friction material composition comprises a binder, a fiber base material, and a friction modifier, and is free of copper and iron-based metal fibers. [Solution] The present invention utilizes a friction material composition containing 20-30% by weight of a titanate as an inorganic friction modifier relative to the total weight of the friction material composition, and is free of mica and vermiculite. The titanate is preferably lithium potassium titanate having a layered crystal structure.

The invention belongs to the technical field of polymer composite material preparation, and particularly relates to a polytetrafluoroethylene composite material and a preparation method thereof, the preparation method comprises the following steps: S1, reinforcing phase pretreatment: S11, potassium magnesium titanate whiskers and potassium titanate whiskers are mixed, an ethanol solution of a silane coupling agent is added, mixing and drying are performed, and modified double whiskers are obtained; s12, adding nano-montmorillonite into deionized water, carrying out ultrasonic dispersion, adding a cationic surfactant, stirring, carrying out centrifugal separation, and drying to obtain organic modified nano-montmorillonite; s13, soaking the short carbon fibers in a nitric acid solution, refluxing, washing to be neutral, and drying to obtain surface hydroxylated short carbon fibers; s2, preparation of a composite emulsion: adding deionized water into a reaction kettle, sequentially adding the materials, and performing stirring and ultrasonic dispersion to form a uniform reinforced phase dispersion liquid; then adding a surfactant and an initiator, and stirring; s3, carrying out polymerization reaction; and S4, carrying out post-treatment.

The application discloses a preparation method of an environment-friendly heat-insulating and heat-preserving coating, and the specific steps of the method are as follows: 1) preparing potassium hexatitanate whiskers through a droplet template technology: dissolving oxalic acid in deionized water to obtain A; adding titanium salt and potassium salt into A and stirring to obtain B; adding B into polyvinylpyrrolidone, ethylene glycol and tetrahydrofuran, stirring and aging to obtain a uniform film; heating under the condition of nitrogen to obtain single-crystal potassium hexatitanate; placing the single-crystal potassium hexatitanate in an alumina crucible, heating, quenching between two thick copper plates and cooling in liquid nitrogen; passing oxygen through the sample to obtain potassium hexatitanate whiskers through annealing; 2) preparing the environment-friendly heat-insulating and heat-preserving coating: mixing water, a dispersing agent, a wetting agent, ethylene glycol and a defoaming agent, adding hydroxyethyl cellulose and a pH regulator, further adding potassium hexatitanate whiskers and nano-silica aerogel and dispersing, and sequentially adding a water-based high-elastic emulsion, a water-based silicone-acrylate emulsion, a film-forming aid, a flame retardant, micrometer hollow glass microbeads, a bactericide and a near-infrared reflective material and stirring uniformly.

The application relates to the technical field of welding materials, and particularly discloses a high-temperature-resistant flux-cored wire containing rare earth elements and a preparation method thereof. The high-temperature-resistant flux-cored wire containing rare earth elements comprises a wire sheath and a core; the core comprises the following raw materials: dehydrated rutile, dehydrated potassium feldspar, zircon sand, metal chromium powder, metal nickel powder, electrolytic manganese, ferrotitanium, aluminiferous iron, potassium cryolite, potassium titanate, sodium titanate, iron powder, yttrium-based iron alloy powder, atomized ferrosilicon, chromium-iron nitride, bismuth oxide, an additive, and the balance of reduced iron powder; the additive is a mixture of zirconium-iron alloy, ferrotitanium alloy and aluminum-magnesium alloy. The application introduces a specific alloy additive into the core to protect the transition of the rare earth yttrium, optimizes the welding performance of the yttrium and multiple components in cooperation, matches the 253MA heat-resistant steel, adjusts the components of the molten slag and the electric arc, and reasonably processes the technology, so that the welding quality of the wire is improved.

This application relates to a copper-aluminum brazed terminal block and its manufacturing method, belonging to the field of power fittings technology. It consists of an aluminum-based terminal block with a copper sheet welded to it. The flux used in the welding is a high-performance, non-corrosive copper-aluminum flux composed of the following components: potassium fluoroaluminate, cesium ammonium fluoride, 1-butyl-3-methylimidazolium tetrafluoroborate, potassium fluorotitanate, and nano-copper oxide. The process involves chemically stripping the dense alumina film using highly active fluorine species released from a pure fluorinated ionic liquid, achieving film removal and avoiding the thermal effects of high temperatures. Secondly, a nano-titanium transition layer is generated in situ through a liquid-phase displacement reaction of potassium fluorotitanate on the nascent aluminum surface, achieving a qualitative change in joint strength from mechanical interlocking to intrinsic metallurgical bonding. Finally, the elimination of chlorine and the presence of a self-cleaning mechanism prevent the flux from absorbing moisture and hydrolyzing or causing electrochemical corrosion, thus ensuring long-term reliability and durability of the joint under harsh environments while achieving good connection performance.

The invention discloses a production system of high-flowability moisture-proof sodium potassium titanate, and relates to the technical field of sodium potassium titanate, the production system comprises a pulsed electric field in-situ moisture-proof layer synthesis unit, a multistage cyclone coupling fluidized bed modification unit and a block chain quality closed-loop control unit, the pulsed electric field in-situ moisture-proof layer synthesis unit comprises a nitrogen-protected closed reaction kettle, a high-frequency ultrasonic disperser and a multi-stage pulsed electric field generator, the high-frequency ultrasonic disperser applies a 0.5-20 MHz pulsed electric field, the field intensity of the pulsed electric field is 10-30 kV / cm, the duty ratio of the pulsed electric field is 15%-90%, and the multi-stage pulsed electric field generator is used for generating the moisture-proof layer. The high-frequency ultrasonic disperser enables a nano rare earth silicate composite coating layer to be generated in situ on the surface of sodium potassium titanate particles, the thickness of the nano rare earth silicate composite coating layer is 10-50 microns, the humidity sensitivity of the nano rare earth silicate composite coating layer is 0.1%-0.3%, the multi-stage rotational flow coupling fluidized bed modification unit comprises three stages of fluidized beds which are arranged in series, and the three stages of fluidized beds are connected in parallel. The inclination angle of the inclination-angle-adjustable swirl nozzle array arranged at each stage is 10-60 degrees, and the distance is 1.2-2.5 times of the particle diameter.

The present invention relates to a potassium magnesium titanate capable of increasing the friction coefficient of a high load region when used in a friction material, the potassium magnesium titanate being represented by the compositional formula KxMg0. 4Ti1. 6O4-y in which x is 0.1 < = x < = 0.6 and y = (0.8-x) / 2, the ratio (Ia / Ib) of the peak area (Ia) at 100 cm <-1 > to 165 cm <-1 > to the peak area (Ib) at 215 cm <-1 > to 1-325 cm <-1 > in the Raman spectrum of the potassium magnesium titanate being 0.03 or more, and the ratio (Ia / Ib) of the peak area (Ib) at 215 cm <-1 > to 325 cm <-1 > being 0.03 or more. The ratio (Ic / Ib) of the peak area (Ic) at 785 cm <-1 > to 900 cm <-1 > to the peak area (Ib) at 215 cm <-1 > to 325 cm <-1 > is 0.40 or less.

This application belongs to the field of inorganic chemical waste recycling and fluoride preparation technology, specifically relating to a method for preparing potassium fluorotitanate from hydrofluoric acid waste liquid. The method includes: S1. Pretreatment of hydrofluoric acid waste liquid and titanic acid powder; S2. Adding the pretreated hydrofluoric acid waste liquid and titanic acid powder to a reaction vessel to generate a fluorotitanic acid solution; S3. Adding potassium carbonate to the fluorotitanic acid solution to generate potassium fluorotitanate, followed by purification of the reaction solution to obtain potassium fluorotitanate crystals; S4. Washing and drying the potassium fluorotitanate crystals to obtain a high-purity potassium fluorotitanate product. This application uses titanic acid powder as the titanium source and optimizes reaction parameters to achieve the dual goals of resource recovery from hydrofluoric acid waste liquid and low-cost preparation of high-purity potassium fluorotitanate.

This utility model relates to the field of potassium titanate whisker preparation technology, and discloses a raw material mixing device for preparing corrosion-resistant potassium titanate whiskers, including a cylinder with a mixing mechanism disposed on the circumferential surface of the cylinder. The mixing mechanism includes a support frame rotatably mounted on the circumferential surface of the cylinder, a groove formed on the inner side of the support frame, a large gear fixed on the circumferential surface of the cylinder, and the large gear located inside the groove. A fixing plate is fixed on the top circumferential surface of the support frame, and a servo motor is fixed on the side of the fixing plate. A small gear is fixed to the output end of the servo motor through the fixing plate. Through the structure of the mixing mechanism, this utility model, with the cooperation of the servo motor, drives the large gear to rotate via the small gear, thereby providing power for the rotation of the cylinder. This causes the cylinder to rotate inside the support plate, and with the cooperation of the spiral blades, the raw materials inside the cylinder can be stirred and mixed, resulting in more uniform mixing and higher mixing efficiency.

The invention provides a modified nano composite material, a preparation method of the modified nano composite material and a brake pad prepared from the modified nano composite material. The composite material comprises the following raw materials: 20-30 parts of an interpenetrating network polymer, 10-18 parts of a double-core self-repairing microcapsule, 4-8 parts of silane modified nano-zinc oxide, 1-3 parts of copper fibers, 8-15 parts of a wear-resistant filler, 6-12 parts of crystalline flake graphite, 5-10 parts of barium sulfate, 7-13 parts of potassium titanate whiskers, 1-2 parts of a release agent and 2-4 parts of a curing agent. According to the invention, the brake pad has good corrosion resistance, friction stability, mechanical properties and self-repairing capability.

The disclosure relates to iron-doped potassium titanate nanotube catalysts, and methods of making and using such catalysts. The catalysts can be used in the hydrogenation of carbon dioxide (CO2) for the production of light olefins.

The present application belongs to the technical field of conveying, and particularly relates to a spiral conveying device for potassium hexatitanate and a conveying method thereof. The spiral conveying device for potassium hexatitanate comprises: a feeding hopper arranged at the top of the feeding end of a machine body; a discharging pipe arranged at the bottom of the discharging end of the machine body; a hot air adjusting mechanism comprising: a positioning pipe slidingly arranged at the end of the machine body; a hot air pipe rotatably arranged in the positioning pipe and in communication with a hot air machine; and a plurality of adjusting members hingedly connected at one end of the hot air pipe and in the shape of a circular arc. When conveying material, each adjusting member is turned outward and expanded relative to the hot air pipe, and the hot air sent out from the hot air pipe is diffused to the machine body through the inner wall of each adjusting member. When the discharging pipe is blocked, the material pushes the positioning pipe to slide outward, the positioning pipe pushes each adjusting member to turn inward and gather, and the hot air sent out from the hot air pipe impacts and clears the material through the inner wall of each adjusting member.

The application discloses a rain night type road marking paint. The road marking paint is prepared from the following raw material components in parts by weight: modified acrylic emulsion 50-80 parts, polyvinylpyrrolidone 30-50 parts, curing agent 8-15 parts, wear-resistant agent 5-8 parts, glass microbead 30-50 parts, potassium feldspar powder 10-20 parts, antioxidant 3-5 parts, dispersing agent 3-6 parts, anti-sedimentation agent 3-5 parts, drying catalyst 1-3 parts, and toughening agent 2-5 parts. The road marking paint prepared by the application has good reflection performance in rain night and daytime; the combination use of the glass microbead and the potassium feldspar powder improves the retroreflective coefficient of the material; the combination use of the adipic dihydrazide and 3,3',4,4'-benzophenonetetracarboxylic dianhydride reduces the drying time; and the combination use of (3,3,3-trifluoropropyl)trimethoxysilane and potassium hexatitanate whisker improves the wear resistance of the material.

The invention discloses a preparation method of fibrous potassium hexatitanate, which comprises the following steps: uniformly mixing organic amine and a titanium-containing compound, and adding alcohol; heating the mixture, adding a potassium-containing compound in the heating process, and uniformly mixing again; adding a spinning aid into the obtained mixture, and then carrying out microfluidic spinning; finally, a sample obtained after spinning is calcined, and fibrous potassium hexatitanate is finally prepared. The preparation method is simple to operate, short in production period, free of waste acid emission, low in cost, environment-friendly and efficient. The average diameter of the prepared fibrous potassium hexatitanate is larger than or equal to 15 micrometers, the fibrous potassium hexatitanate is in a thick rod shape and uniform in morphology, the mechanical property and stability of the composite material can be remarkably improved, and the fibrous potassium hexatitanate is not prone to being sucked into the human body and entering blood or lymph.

The present invention discloses a preparation method of carbon-modified titanate with a high aspect ratio, which comprises the following steps: attapulgite, starch, orthotitanic acid, a potassium-containing precursor and furfuryl alcohol are mixed, and stirred to enable the starch, orthotitanic acid and potassium-containing precursor to fully immerse into the pores of rod-shaped attapulgite, and drying is carried out at a controlled temperature of 80-100 °C to obtain titanium source / potassium source / carbon source / attapulgite; the titanium source / potassium source / carbon source / attapulgite is put into a crucible, a tube furnace is used as a heating device, and reaction is carried out at 750-900 °C for 90 min, and an inert atmosphere is passed throughout the reaction; after cooling with the furnace, it is centrifugally washed with deionized water, and then dried at 80 °C for 6-8 h to obtain carbon-modified titanate with a high aspect ratio. The carbon-modified potassium hexatitanate with a high aspect ratio based on attapulgite has good fluidity and will not generate fibers during friction, playing a role in increasing strength and wear resistance, so that the friction coefficient of the whole friction material is relatively more stable and the high-temperature recession rate is lower.

To provide a friction couple having an enhanced effect and stability in a low speed range, where the friction couple has a disc brake pad having a friction material manufactured from a friction material composition having a binder, a fiber base, and a friction modifier, without containing a copper component and a ferrous metallic fiber, and a stainless steel disc rotor. The present invention uses a friction material composition containing 20-30 weight % of a titanate relative to an entire friction material composition as an inorganic friction modifier without containing an inorganic friction modifier that has a Mohs hardness of 4 or less and is cleavable. The above-explained titanate is preferably a layer crystal structure lithium potassium titanate.

The invention belongs to the technical field of wastewater treatment, and provides a recovery method of tantalum-niobium hydrometallurgy acid wastewater. The recovery method comprises the following steps: atomizing the tantalum-niobium wet smelting acidic wastewater, performing flash evaporation, and respectively collecting to obtain volatile acid and residual liquid; and filtering the residual liquid to obtain the non-volatile acid. According to the recovery method, after the tantalum-niobium hydrometallurgy acid wastewater is atomized, flash evaporation is carried out, the flash evaporation can realize separation of volatile acids (hydrofluoric acid, fluosilicic acid and fluotitanic acid) and non-volatile acids (sulfuric acid), and the mass fraction of the sulfuric acid in the non-volatile acids is 70-80%, and the sulfuric acid can be used for ore decomposition; the volatile acid can be used for preparing potassium fluosilicate and potassium fluotitanate; and the sludge yield is low, and the hazardous waste disposal cost is reduced. The flash evaporation operation is simple, the equipment is easy to operate, the requirement for the overall quality of operators is low, and the method is easier to popularize.

The present invention relates to the technical field of waterproof boards, and provides a highly weather-resistant metal composite waterproof board and a preparation method thereof. The highly weather-resistant metal composite waterproof board sequentially comprises a weather-resistant coating, an organic film layer, a bonding layer, a metal plate, a corrosion-resistant layer, and a PE board from top to bottom. The organic film layer comprises one of a PVC film, a TPO film, an EPDM film, a TPR film, and a fluorocarbon film. The bonding layer comprises the following components in parts by weight: 65-75 parts of SEBS, 28-36 parts of polyvinyl acetate, 5-8 parts of tackifier, 10-15 parts of filler, and 2-4 parts of stabilizer. The filler comprises zinc oxide-coated potassium titanate whiskers. Through the above technical solution, the problems of low peel strength and poor weather resistance of the metal composite waterproof board in the related art are solved.