76 results about "Mercaptobenzothiazole" patented technology

The invention relates to a composite reverse osmosis membrane acidic cleaning agent, a preparation method and a cleaning process thereof, and belongs to the technical field of environment-friendly water treatment. The cleaning agent comprises the following components in percentage by mass: 4-8% of inorganic acid, 20-40% of organic acid, 1-3% of a surfactant, 0.5-1% of a chelating agent, 0.5-1% of a compound corrosion inhibitor and the balance of deionized water. The composite corrosion inhibitor is formed by compounding 2-mercaptobenzothiazole and the like according to a specific mass ratio, the molecular weight of polyaspartic acid is 5000, and the molar ratio of Zn to Mo in the zinc-molybdate compound is 2: 1. The preparation method comprises the following four steps: firstly preparing a compound corrosion inhibitor premix, then preparing an acidic base solution, and then sequentially adding the components to finally obtain the cleaning solution. According to the cleaning process, a cleaning agent and deionized water are mixed, the membrane flux recovery rate is larger than or equal to 85% through cleaning of a specific process, the reverse osmosis membrane can be effectively cleaned, and the performance of the reverse osmosis membrane can be recovered.

The invention discloses a copper surface micro-etching coarsening solution for a fine circuit as well as a preparation method and application of the copper surface micro-etching coarsening solution, and relates to the technical field of printed circuit board manufacturing. The copper surface micro-etching coarsening solution for the fine circuit is prepared from, by mass concentration, 60 g / L to 100 g / L of sulfuric acid, 40 g / L to 60 g / L of hydrogen peroxide, 0.5 g / L to 2 g / L of zinc sulfate, 10 g / L to 30 g / L of copper ions, 0.5 g / L to 1 g / L of pyridine heterocycle-containing Schiff base, 10 g / L to 100 g / L of ethyl alcohol, 1 g / L to 3 g / L of 2-mercaptobenzothiazole, 1 g / L to 5 g / L of methionine and 1 g / L to 5 g / L of polyacrylamide. According to the copper surface micro-etching coarsening solution, the 2-mercaptobenzothiazole and the methionine in the copper surface micro-etching coarsening solution can enable the copper surface to form a honeycomb structure under the low micro-etching amount, the zinc sulfate and the pyridine heterocyclic ring-containing Schiff base can form a composite film layer with copper ions on the surface of the honeycomb structure, and the interlayer binding force is improved.

The invention discloses a composite collecting agent and a preparation method and application thereof, and relates to the technical field of solid waste recycling. The composite collecting agent comprises a main agent, an auxiliary agent and a synergist, and the mass ratio of the main agent to the auxiliary agent is (3-1): (1-2). The mass of the synergist is 0.1%-2.5% of the total mass of the composite collecting agent; the structural formula of the main agent is as shown in formula (I): R-O-C (= S)-NH-R '(I); in the formula (I), R is alkyl, and R'is 3-chloro-1, 2-epoxypropane; the auxiliary agent is a mercaptobenzothiazole derivative. The thiocarbamate and the mercaptobenzothiazole derivative are compounded according to a specific proportion for the first time, a Zn-S shielding layer is destroyed through an intermolecular synergistic effect, and the silver recovery rate is increased; the preparation method is simple and easy to operate, facilitates reduction of the dosage of a single agent and reduces environmental pollution. The foam stability is improved, the flotation efficiency is improved, the selective collection efficiency of the silver-zinc ore is remarkably improved, and the flotation index is improved.

The invention relates to the technical field of silicone rubber, in particular to high-temperature-resistant flame-retardant silicone rubber, a preparation method thereof and a cable, the high-temperature-resistant flame-retardant silicone rubber comprises a gradient layer material composed of a surface layer material, a transition layer material and a core layer material, and the surface layer material comprises methyl vinyl silicone rubber, superfine furnace black, calcium stannate, polyacrylonitrile aerogel and a flame-retardant premix; the transition layer material comprises methyl vinyl silicone rubber, superfine furnace carbon black, spandex fibers, polyarylester, calcium stannate and a flame-retardant premix; the core layer material is prepared from methyl vinyl silicone rubber, superfine furnace black, aramid fiber, polyarylester, phthalonitrile resin and 2-mercaptobenzothiazole zinc salt; wherein the flame-retardant premix is prepared from hydroquinone bis (diphenyl) phosphate, phenyl ethyl aluminum phosphinate and zinc hypophosphite according to the weight ratio of (6 to 10): (2 to 4): (1 to 3); the problems that an existing material is prone to aging in an extreme environment, the flame retardant effect is poor, and the mechanical property is degraded are effectively solved.

The invention discloses a high-elastic material for an anti-slip sole and a preparation method of the high-elastic material in the field of high polymer materials. The high-elastic material is prepared from the following raw materials: modified polyurethane, modified silicone rubber, calcium carbonate, dicumyl peroxide, 2-mercaptobenzothiazole, N-isopropyl-N '-phenyl p-phenylenediamine and naphthenic oil. Wherein the modified polyurethane is prepared by the following steps: carrying out vacuum dehydration on polybutylene adipate, reacting with toluene diisocynate to prepare an isocyanate-terminated prepolymer, adding dimethylolpropionic acid, triethylamine and deionized water to obtain a water-based dispersion, and carrying out graft copolymerization on the water-based dispersion, methyl methacrylate and the like; the preparation method comprises the following steps: preheating modified polyurethane, mixing with modified silicone rubber at a high speed, adding calcium carbonate and naphthenic oil, carrying out double-roller open milling and thin-passing, adding a vulcanizing agent and the like, carrying out overturning milling, and carrying out flat plate vulcanization molding. The material is used for anti-skid soles, and has the advantages of high elasticity, lasting skid resistance and excellent weather resistance.

The invention discloses an acid and alkali resistant fiber and a preparation method thereof, and relates to the field of fiber fabrics. When the acid and alkali resistant fiber is prepared, dimethyl terephthalate, polyethylene glycol-2000, ethylene glycol, 1, 3-bis (3-hydroxypropyl)-1, 1, 3, 3-tetramethyldisiloxane and diethyl phosphite are polymerized and then react with 4-vinyl benzoyl chloride and 2-mercaptobenzothiazole in sequence, and modified polyester is prepared; the preparation method comprises the following steps: sequentially reacting microcrystalline cellulose with 3-(chloromethyl)-2-hydroxybenzaldehyde, 4-allylthiosemicarbazide and copper chloride to prepare modified cellulose; the modified cellulose and the modified polyester are mixed and subjected to melt spinning, then perfluoroethylene is used for after-finishing, and the acid and alkali resistant fiber is prepared. The acid and alkali resistant fiber prepared by the invention has durable, flame-retardant and antibacterial capabilities.

This invention discloses an analytical method for benzothiazole contaminants, comprising the following steps: detection by high performance liquid chromatography (HPLC), with the following chromatographic conditions: a phenylhexyl column as the stationary phase, mobile phase A being water, mobile phase B being acetonitrile, and gradient elution; wherein the benzothiazole contaminants are at least one of 2-aminobenzothiazole, 2-hydroxybenzothiazole, benzothiazole, 2-methylbenzothiazole, 2-mercaptobenzothiazole, 2,5-dimethylbenzothiazole, 2-cyanobenzothiazole, ethyl 2-carboxylate benzothiazole, 2-chlorobenzothiazole, 2-bromobenzothiazole, 2-methylthiobenzothiazole, phenylthiocyanate, N-tert-butyl-2-benzothiazole sulfenamide, 2-(2-hydroxyphenyl)-benzothiazole, N-cyclohexyl-2-benzothiazole sulfinamide, dibenzothiazole disulfide, and N,N-dicyclohexyl-2-benzothiazole sulfonamide.

The utility model relates to a filtering device for recycling MBT resin in the technical field of resin recycling treatment equipment. The filtering device comprises a box body with an opening in the top, a filtering frame is arranged in the box body, the filtering frame is matched with a feeding pipe, an air suction hood is arranged above the box body, the air suction hood is fixedly connected with the box body through a stand column, and the top of the air suction hood is connected with an exhaust pipe; a plurality of sliding blocks are fixedly connected to the top of the filter frame and correspond to the stand columns one to one, vertical first sliding grooves are formed in the faces, corresponding to the sliding blocks, of the stand columns, first vertical telescopic rods are fixed to the bottoms of the first sliding grooves, and the telescopic ends of the tops of the first vertical telescopic rods are fixedly connected with the bottoms of the corresponding sliding blocks. According to the utility model, the structure is simple and reasonable, materials can be efficiently filtered, hot gas or harmful gas can be timely exhausted through the exhaust pipe of the suction cup for additional treatment during filtering, the overflow of the hot gas or harmful gas is reduced, the safety is improved, the filtering frame after filtering is convenient to clean, and the next use is not influenced.

The invention discloses oxidized paraffin and antirust wax and a preparation method thereof, and relates to the field of paraffin. The antirust wax comprises oxidized paraffin, an emulsifier, an antirust agent and water, and the emulsifier is at least one of sorbitan monooleate, lauryl sodium sulfate and fatty alcohol-polyoxyethylene ether; the antirust agent is at least one of cyclohexylamine stearate, alkenyl succinic acid and alpha-mercaptobenzothiazole; the oxidized paraffin is loaded with a Mn metal element through a carrier. The catalyst loaded with the active component Mn is added in the preparation process of the oxidized paraffin, the acid value and the soap value of the oxidized paraffin are effectively increased, the oxidized paraffin interacts with the specific emulsifier and the antirust agent, the emulsifier does not affect the anti-oxidation protection function of functional components, and meanwhile, the antirust agent and the oxidized paraffin cooperate with each other to achieve the anti-corrosion effect in a synergistic mode; and the antirust capability of metal in a humid and hot environment and an acid-base environment is improved, and the application prospect is expanded.

To provide a perovskite solar cell that suppresses performance degradation over time caused by moisture.SOLUTION: A perovskite solar cell 1 has, on a substrate 10, a first electrode layer 21, a first carrier transport layer 31, a perovskite layer 40, a second carrier transport layer 32, and a second electrode layer 22 stacked in this order. The main component of the perovskite layer 40 has a perovskite structure and has photoelectric conversion functionality. The perovskite layer 40 contains 2-mercaptobenzothiazole as an additive.SELECTED DRAWING: Figure 1

The application provides a preparation method of an oxygen-containing carotenoid, in particular a preparation method of canthaxanthin (I-a) or astaxanthin (I-b), and the preparation method comprises the following steps: (1) C15-alcohol (II) is reacted with 2-mercaptobenzothiazole (MBT) to prepare C15-benzothiazole sulfide (III), and the C15-benzothiazole sulfide (III) is further oxidized to prepare C15-benzothiazole sulfone (IV); (2) the C15-benzothiazole sulfone (IV) is coupled with C10-dialdehyde (V) to prepare the target product: canthaxanthin (I-a) or astaxanthin (I-b); the method has low raw material cost, avoids the use of phosphorus salt in the traditional synthesis route, and the by-product 2-hydroxybenzothiazole is an important intermediate for synthesizing the herbicide thiobencarb, and also has economic benefits; and the method provides an efficient, economical and environmentally-friendly solution for large-scale clean production of canthaxanthin and astaxanthin.

The present invention discloses a flotation agent for copper, molybdenum, gold, and silver sulfide ores and a cascade enrichment flotation method for copper, molybdenum, gold, and silver sulfide ores, relating to the field of mineral flotation technology. The composite depressant is compounded with nitrated modified humic acid and nano-silicon dioxide in a certain mass ratio. This depressant enhances the simultaneous capture of copper, molybdenum, gold, and silver under the action of a composite collector. The composite collector is compounded with mercaptobenzothiazole and hydroxamic acid, synergistically improving the recovery rate of gold and silver. The process includes a mixed flotation stage and a cascade separation stage, ultimately yielding a copper, molybdenum, gold, and silver concentrate. This process addresses the difficulties in separating sulfur and precious metals and the high toxicity of the reagents in traditional processes, offering the advantages of high efficiency, environmental protection, and a short process.

The invention discloses a complexing inhibitor for inhibiting redissolution of heavy metal sulfide as well as a preparation method and application of the complexing inhibitor. The complexing inhibitor is prepared by compounding the following three components: a component A which is a metal salt, a component B which is an organic sulfur medicament and a component C which is an organic non-sulfur medicament, wherein the mass ratio of the component A to the component B to the component C is (1-2): (1-3): (2-6); the component A is selected from dithiocarbamate, and the component B is selected from at least one of dithiocarbamate, mercaptobenzothiazole or sodium dimethyl dithiocarbamate; and the component C is selected from at least one of chitosan, polyethyleneimine or 1-hydroxyethylidene-1, 1-diphosphonic acid. The inhibitor is especially suitable for preventing excessive sulfur ions from complexing and dissolving precipitated heavy metal sulfide in industrial wastewater treatment, and effectively controlling the concentration of heavy metal ions to rise.

The application discloses a rubber accelerator 2-mercaptobenzothiazole tellurium and a preparation method and application thereof. The 2-mercaptobenzothiazole and the tellurium dioxide are respectively dissolved in solvents to obtain a tellurium dioxide solution and a 2-mercaptobenzothiazole solution; the tellurium dioxide solution is dropped into the 2-mercaptobenzothiazole solution, and a rubber accelerator 2-mercaptobenzothiazole tellurium is obtained by reaction under stirring. The preparation method is simple in operation, has few side reactions and can be carried out at room temperature. The rubber accelerator 2-mercaptobenzothiazole tellurium prepared has a medium speed and is superior to existing thiazole accelerators (M and DM) and selenothiazole accelerators (SeM) in performance.

The application provides a method for synthesizing 2,2'-dithiobisbenzothiazole under negative pressure, wherein the absolute pressure of a reaction system is controlled to be 20-45 kpaA, the reaction temperature in a reaction kettle is kept at 30-60 DEG C under the pressure, 2-mercaptobenzothiazole slurry and an oxidizing agent are reacted, 2,2'-dithiobisbenzothiazole is synthesized by a one-step method, and solvent vapor is returned to a solvent recovery tank after being condensed. The method can control the reaction temperature by controlling the vacuum degree of the reaction system, the reaction kettle body does not need to be provided with heat exchange pipes, the problem of poor heat transfer effect caused by fouling can be effectively avoided, the production can be continuously and stably carried out, the cost of starting and stopping and the safety risk can be effectively reduced, the reaction heat can be effectively utilized to recover the solvent, the energy consumption cost of 200 yuan per ton of product can be directly reduced, the temperature in the reaction system kettle is more uniform, the side reaction is less, the product content is high, and the yield is high.

The invention relates to the technical field of regenerated rubber production, in particular to heat-resistant regenerated rubber. The composite material is prepared from the following components in parts by weight: 60-80 parts of waste rubber powder, 15-30 parts of ethylene propylene diene monomer, 5-10 parts of silane modified graphene / nano silicon dioxide composite filler, 3-8 parts of N-phenylmaleimide-glycidyl methacrylate copolymer heat-resistant agent, 5-12 parts of polyphosphazene elastomer, 1-3 parts of vulcanizing agent, 0.5-2 parts of accelerant, 1-3 parts of active agent and 1-3 parts of anti-aging agent. The waste rubber powder is subjected to ozone-microwave synergistic treatment, and the composite filler is modified through a silane coupling agent; the vulcanizing agent is a ternary compound of dicumyl peroxide, sulfur and 2-mercaptobenzothiazole, and the anti-aging agent is a compound of 4010NA, RD and 2, 6-butylated hydroxytoluene. Through multi-component collaborative design and process optimization, the mechanical property, heat resistance, heat conductivity and aging resistance of the material are improved, the problems that traditional regenerated rubber is unbalanced in rigidity and toughness, poor in heat resistance and the like are solved, and the comprehensive performance is excellent.

The invention discloses a vegetable oil-based high-lubrication environment-friendly cutting fluid and a preparation method thereof, and belongs to the technical field of metal working fluids. The cutting fluid is prepared from the following components in parts by mass: 18-25 parts of compound vegetable oil, 8-15 parts of compound organic acid, 0.3-0.8 part of colloidal graphite, 0.2-0.6 part of boron-molybdenum-rare earth friction modifier, 5-10 parts of amino-acid ester antirust agent, 4-10 parts of pH response type bifunctional vegetable oil amide, 1-2 parts of cosolvent, 10-16 parts of triethanolamine, 1-3 parts of bactericide and the balance of deionized water, wherein the total mass of the cutting fluid is 100 parts. A mercaptobenzothiazole extreme pressure functional group and a carboxyl pH response switch are covalently bonded to a vegetable oleic acid skeleton, so that a single molecule simultaneously has environment sensing and powerful film forming functions. The molecules are stably dispersed in an alkaline environment of the cutting fluid, instantaneous conformation overturning is carried out in a local acid micro-area of a friction interface, extreme pressure groups are exposed and chemically adsorbed with a metal surface, and a dynamic reversible self-repairing lubricating film is formed.

The application belongs to the technical field of paint preparation, and provides polyester resin powder paint with high salt mist corrosion resistance and a preparation method thereof.The powder paint is composed of a carboxyl functional polyester resin, a hydroxyalkylamide curing agent and / or trisglycidyl isocyanurate to form a film forming system, and is matched with titanium dioxide, inorganic fillers, acrylate leveling agent, benzoin and wax powder;quaternary ammonium poly-p-vinyl pyridine microgel is introduced into the paint, and double-particle-size microcapsules are added;the microcapsule core layer contains hydroxyl-terminated polydimethylsiloxane, mercaptobenzothiazole corrosion inhibitor components, polycarbodiimide and phthalate plasticizer, the shell layer is a polyurea inner shell and a polydopamine outer shell and contains a disulfide bond structure, an epoxy silane hydrolysis and condensation layer is arranged on the outer layer and loads the microgel.

The application discloses a special antifreeze for fire brigade, and has the following components and weight ratio: color, sodium chloride, preservative and water, wherein the preservative is composed of sodium benzoate, borax, mercapto benzothiazole, polyphosphate and deionized water, and relates to the technical field of antifreeze. The special antifreeze for fire brigade has good freezing point reduction performance, excellent corrosion resistance and microbial inhibition performance, and is suitable for the winter antifreezing demand scene of fire brigade pipeline and cold storage, thus having wide application prospect.

The invention discloses a rubber product low-temperature vulcanization accelerator and a preparation method thereof. The rubber product low-temperature vulcanization accelerator is prepared from ethylene-propylene diene monomer, ethylene-vinyl acetate copolymer, auxiliaries, 2-mercaptobenzothiazole zinc salt powder, sulfenamide accelerator powder, tetrabenzylthiuram disulfide accelerator powder and accelerator BG powder. According to the low-temperature vulcanization accelerator for the rubber product, various accelerators are combined and used according to corresponding proportions, the problems existing in the using process of a single accelerator are solved, proper processing parameters are adjusted according to the proportions, the production efficiency is improved, the production quality is improved, and the low-temperature vulcanization accelerator is environmentally friendly.

To provide, regarding a carboxyl group-containing acrylic rubber composition and a crosslinked product thereof, a crosslinked product having excellent handling property during processing, excellent scorch stability during crosslinking, no generation of harmful substances during crosslinking, and excellent heat resistance and compression set properties after crosslinking.MEANS FOR SOLVING THE PROBLEM: It was discovered that the handling property during processing is excellent, the scorch stability during crosslinking is excellent, no harmful substances are generated during crosslinking, and the heat resistance and compression set properties after crosslinking are excellent when 100 pts.mass of (A) a carboxyl group-containing acrylic rubber, 0.15 to 4 pts.mass of (B) an ammonium salt of an aromatic carboxylic acid or an ammonium salt of a C3-10 aliphatic carboxylic acid and / or (C) an amine salt of mercaptobenzothiazole, 0.1 to 10 pts.mass of (D) a tertiary amine and / or a guanidine compound, and 0.01-10 pts.mass of (E) an aliphatic diamine compound and / or an aromatic diamine compound are contained.SELECTED DRAWING: None

The application discloses a kind of corrosion-resistant magnesium alloy material and preparation method thereof, it is related to alloy material technical field.The application is when preparing corrosion-resistant magnesium alloy material, pure magnesium, pure zinc, pure aluminum, magnesium gadolinium intermediate alloy and magnesium calcium intermediate alloy are fused and refined to obtain as-cast magnesium alloy;As-cast magnesium alloy is sequentially subjected to solid solution treatment, aging treatment, is extruded and is spun to obtain fine-grained magnesium alloy;After fine-grained magnesium alloy is cut and sampled, micro-arc oxidation is carried out, and then treated by 3-aminopropyl triethoxysilane alcoholysis solution to obtain pretreated magnesium alloy;Urea, formaldehyde are wrapped 2-mercapto benzothiazole to carry out in-situ polymerization to prepare corrosion-inhibiting microcapsule;Dimethyl imidazole, corrosion-inhibiting microcapsule and epoxy resin are spin-coated on the surface of pretreated magnesium alloy to prepare corrosion-resistant magnesium alloy material.The corrosion-resistant magnesium alloy material prepared by the application has excellent corrosion resistance, tensile strength and wear resistance.

The invention discloses an environment-friendly medicament for sewage treatment and a preparation method thereof, and belongs to the technical field of water treatment. The environment-friendly medicament for sewage treatment is prepared from the following raw materials in parts by weight: 15 to 20 parts of modified cellulose, 10 to 15 parts of layered double hydroxides, 25 to 30 parts of diatomite, 1 to 3 parts of 2-mercaptobenzothiazole, 20 to 25 parts of polyaluminum chloride, 5 to 8 parts of poly dimethyl diallyl ammonium chloride and 5 to 8 parts of ferrous sulfate. Wherein the modified cellulose is subjected to dual modification of quaternization and amino grafting. According to the environment-friendly sewage treatment agent, through innovative compounding of the modified cellulose, the layered double hydroxides and the 2-mercaptobenzothiazole, the diatomite is taken as a carrier and has a synergistic effect with other substances, so that suspended matters in water are rapidly reduced, an excellent removal effect on COD (Chemical Oxygen Demand), total phosphorus and heavy metal ions is also achieved, and the sewage treatment efficiency is remarkably improved. The sewage treatment environment-friendly medicament disclosed by the invention realizes the purpose of efficient and comprehensive sewage treatment, is environment-friendly and has a remarkable application value.

The invention relates to the technical field of high polymer materials, in particular to impact-resistant and corrosion-resistant nylon plastic and a preparation method thereof. The flame-retardant toughening material is prepared by adding the modified flame-retardant siloxane, the methacrylated cycloaddition product and the allyl glycidyl ether. And taking the modified glass fiber as a base material, and adding aluminum nitrate nonahydrate, zinc nitrate hexahydrate, sodium hydroxide and 2-mercaptobenzothiazole as main raw materials to prepare the corrosion-resistant toughening material. And adding the flame-retardant toughening material into the mixed nylon resin PA6, uniformly stirring, adding the corrosion-resistant toughening material, the lubricant and the antioxidant, uniformly stirring, and carrying out melt extrusion to obtain the finished product nylon plastic. The finished product prepared by the invention has excellent impact resistance, corrosion resistance and flame retardance, so that the product has a wide application prospect in the technical field of high polymer materials.

The present application relates to a kind of composite reverse osmosis membrane acidic cleaning agent, preparation method and cleaning process, belong to environmental protection water treatment technical field.The cleaning agent contains 4~8% inorganic acid, 20~40% organic acid, 1~3% surfactant, 0.5~1% chelating agent, 0.5~1% composite corrosion inhibitor by mass percentage, and the balance is deionized water.Composite corrosion inhibitor is compounded by 2-mercaptobenzothiazole etc.according to specific mass ratio, and the molecular weight of polyaspartic acid is 5000, and the molar ratio of Zn:Mo in zinc-molybdate complex is 2:1.The preparation method is divided into four steps, first, composite corrosion inhibitor premix is prepared, then acidic base fluid is prepared, then each component is added in turn, and finally cleaning solution is obtained.Cleaning process mixes cleaning agent with deionized water, and is cleaned through specific process, membrane flux recovery rate is ≥85%, can effectively clean reverse osmosis membrane, and restore its performance.

This invention discloses a composite sealant for metal artifacts and its preparation and application method, comprising a base sealant and a top sealant. The base sealant comprises 20-40 parts by weight of a film-forming substance, 0.5-5 parts by weight of a composite corrosion inhibitor, and 55-79 parts by weight of a first solvent. The composite corrosion inhibitor comprises benzotriazole and 2-mercaptobenzothiazole, with a mass ratio of benzotriazole to 2-mercaptobenzothiazole of 1:0.2-1:5. The top sealant comprises 20-40 parts by weight of a film-forming substance, 1-10 parts by weight of nano-silica, 0.5-5 parts by weight of a hydrophobic modifier, and 45-78 parts by weight of a second solvent. This invention achieves efficient and durable protection for metal artifacts through the synergistic combination of benzotriazole and 2-mercaptobenzothiazole in the base sealant, exhibiting advantages such as good water resistance, strong salt spray corrosion resistance, high transparency, and good reversibility.

The application relates to the technical field of metal powder, and discloses a preparation method of fine-granularity high-strength tin powder. The preparation method of the fine-granularity high-strength tin powder comprises the following steps: S1, tin raw materials are heated to 300-320 DEG C and melted to prepare liquid tin; S2, the liquid tin is atomized and sprayed into a cooling medium through a nozzle to prepare refined tin powder; wherein the diameter of the nozzle is 0.1-0.5 mm, and the pressure of the nozzle is 5-10 MPa; during the atomization process, 0.01-0.1% of mercaptobenzothiazole by weight of the liquid tin is added; S3, the refined tin powder is collected; S4, the refined tin powder is subjected to ball milling treatment; and S5, the refined tin powder after the ball milling treatment is subjected to annealing treatment, washing and drying to prepare the fine-granularity high-strength tin powder. The fine-granularity high-strength tin powder prepared by the application has high mechanical strength, good toughness and can effectively prevent oxidation.

The present application belongs to the technical field of conveying belt, and particularly relates to a flame-retardant heat-resistant conveying belt and a preparation method thereof. The flame-retardant heat-resistant conveying belt provided by the present application comprises a framework layer and a covering rubber layer, and the covering rubber layer comprises the following components: ethylene-propylene-diene rubber, nitrile rubber, flame-retardant resin, reinforcing agent, nano flame-retardant agent, accelerator, antioxidant and sulfur. In the present application, the flame-retardant resin is used as part of the flame-retardant agent instead of the traditional flame-retardant agent to be added into the covering rubber, so as to reduce the influence of the amount of the flame-retardant agent on the mechanical properties of the covering rubber; the bisphenol A-bis(diphenyl phosphate) modified nano aluminum hydroxide is used as the nano flame-retardant agent to be added into the covering rubber, so as to improve the compatibility of the nano aluminum hydroxide with the covering rubber and the flame-retardant heat-resistant properties of the covering rubber; and the 2-mercaptobenzothiazole and N-cyclohexyl-2-benzothiazole sulfenamide are used to form the accelerator together, so as to improve the vulcanization efficiency and improve the mechanical properties and aging resistance of the covering rubber.

To provide a curable silicone composition excellent in salt water resistance and uniformity, and a compound capable of imparting excellent salt water resistance and uniformity to the curable silicone composition.SOLUTION: The present invention relates to a curable polyorganosiloxane composition containing (A) a polyorganosiloxane having two or more hydrolyzable groups bonded to a silicon atom in one molecule, (B) a curing catalyst, and (C) a compound containing a mercaptobenzothiazolyl group and one or more selected from the group consisting of a hydrolyzable group bonded to a silicon atom and a siloxane chain in one molecule, and the component (C).SELECTED DRAWING: None

The application discloses a preparation method of arbutin, and the preparation method comprises the following steps: (1) C5-halogenated ester (II) is reacted with 2-mercaptobenzothiazole (MBT) to generate C5-BT (III), and C5-BT (III) is further oxidized to prepare C5-BTS (IV); and (2) C5-BTS (IV), C15-BTS (V) and C10-dialdehyde (VI) are coupled to prepare arbutin (I), and the specific route can be C5+C10→C15, C15+C15→C30, or C15+C10→C25, C25+C5→C30; the method has low raw material cost, avoids the use of phosphorus salt in a traditional synthesis route, and provides an efficient, economical and environmentally-friendly solution for large-scale clean production of arbutin.