171 results about "Dimethylbenzenes" patented technology

The application relates to the technical field of concrete member protection, and particularly discloses a highway concrete member protection coating under a coastal environment and a preparation method thereof. The highway concrete member protection coating under the coastal environment comprises an epoxy resin bottom layer and a fluorocarbon resin surface layer, the fluorocarbon resin surface layer is formed by spraying a surface layer coating, and the surface layer coating comprises the following raw materials in parts by weight: 28-32 parts of fluorocarbon resin, 3-5 parts of graphene oxide, 6-10 parts of montmorillonite, 10-14 parts of a stabilizing component, 160-170 parts of dimethylbenzene, the stabilizing component comprises a toughening agent, a leveling agent and a compatilizer, and the weight ratio of the toughening agent, the leveling agent and the compatilizer is 2-3:2-3:1. The protection coating can be used for protecting highway concrete members under a coastal environment.

The invention provides a charcoal-loaded iron-based catalyst suitable for heterogeneous catalysis as well as a preparation method and application of the charcoal-loaded iron-based catalyst. The preparation method comprises the following steps: firstly, activating and modifying tea leaves by adopting a potassium hydroxide solution, and then carrying out heat-preservation pyrolysis in a carbon dioxide atmosphere to obtain tea-leaf-based biochar; uniformly mixing an iron source, a manganese source, a cerium source and a citric acid solution; adding tea-based biochar, uniformly mixing, and drying to obtain a precursor; and heating the precursor to 400-650 DEG C, and carrying out heat preservation and pyrolysis to obtain the biochar-loaded iron-based catalyst. The biochar-loaded iron-based catalyst has excellent degradation and removal effects and cycle stability on xylene.

The invention relates to a preparation method of silicon dioxide-boron nitride nanobelt aerogel, which comprises the following steps: dissolving melamine and boric acid in a co-solvent of tert-butyl alcohol and hot deionized water, stirring and mixing, carrying out ultrasonic treatment, freeze-drying and the like to obtain a melamine-boric acid aerogel precursor, placing the precursor in a tubular furnace, and carrying out vacuum drying to obtain the silicon dioxide-boron nitride nanobelt aerogel. Pyrolyzing in an ammonia gas atmosphere to obtain boron nitride nanobelt aerogel; and placing the boron nitride nanobelt aerogel in a xylene solution containing tetraethoxysilane and silicon tetrachloride, taking out the boron nitride nanobelt aerogel, and drying the boron nitride nanobelt aerogel. And hydrolyzing and pyrolyzing in an inert atmosphere to form a silicon dioxide layer on the surface, thereby obtaining the silicon dioxide-boron nitride nanobelt aerogel. The silicon dioxide and boron nitride nanobelt aerogel is low in density and excellent in mechanical property and oxidation resistance.

The present application relates to a kind of powder coating hydroxyalkylamide matting curing agent and its preparation method, the matting curing agent using including citric acid, 2-methyl-1,3-propanediol, dimethylbenzene, anhydrous methanol, N-methyl monoethanolamine, catalyst, nanometer titanium dioxide is reacted to obtain raw materials.In first, citric acid and 2-methyl-1,3-propanediol are grafted to carry out reaction, then the remaining four carboxyl groups of grafting are methyl esterification reaction, obtain methyl esterification product, then with N-methyl monoethanolamine acylation reaction obtains hydroxyalkylamide curing agent;Add nanometer titanium dioxide, fully mix and process to obtain the matting curing agent.The curing agent product functionality is higher, the hardness of coating film after curing is higher, and the boiling water resistance is excellent;And the coating film after curing has obvious matting effect, coating film gloss is basically reached 50-70%, and the decorative property is excellent.

The invention discloses high-wear-resistance HFBMA (hexafluorobutyl methacrylate) acrylic resin and a preparation method thereof. The high-wear-resistance HFBMA acrylic resin is prepared from the following components in percentage by mass: 30 to 40 percent of styrene, 8 to 15 percent of hydroxypropyl ester, 8 to 15 percent of propyl butyl ester, 0.3 to 1.5 percent of methacrylic acid, 0.5 to 2 percent of initiator, 3 to 10 percent of hexafluorobutyl methacrylate (HFBMA), 2 to 8 percent of organic silicon monomer or POSS (polyhedral oligomeric silsesquioxane) and 25 to 35 percent of xylene. According to the experiment, the optimal raw material composition and proportion are obtained through screening of a large number of experiments, the optimal synthesis process is obtained through optimization of a large number of experiments, and the conversion rate reaches 98.8% or above. The acrylic resin disclosed by the invention has excellent wear resistance, weather resistance, chemical resistance, high hardness, high adhesive force and excellent hydrophobicity and anti-fouling performance, and the comprehensive performance is remarkably and technically improved.

The invention provides a diesel oil anti-wear agent and a preparation process thereof, and belongs to the technical field of diesel oil additives, and the preparation process comprises the following steps: mixing and stirring diisooctyl maleate and xylene, adding diethylenetriamine and deionized water, carrying out heating reaction, adding toluene, 4-(aminomethyl) pyridine and ethylene oxide, carrying out mixing reaction, filtering, washing, and drying to obtain the diesel oil anti-wear agent. The pyridinium-based polyester hollow capsule is prepared; the preparation method comprises the following steps: mixing xylene, catechol, ethylene phosphonic acid, ammonium persulfate and deionized water, heating, dispersing in cyclohexane, adding polyvinyl alcohol, octadecyl methacrylate and azodiisobutyronitrile, mixing and reacting to obtain catechol phosphonate nano colloidal particles; mixing and stirring the fatty acid ester solution, the oleoyl fluorocarbon copolymer and the pyridinium-based polyester hollow capsule, adding the catechol phosphonate nano colloidal particles, continuously stirring, performing ultrasonic treatment, and degassing to obtain the diesel oil anti-wear agent. The diesel oil antiwear agent can improve the antiwear property and demulsibility of the diesel oil antiwear agent.

The invention provides a protective coating for a fuel storage and transportation cabin and a preparation method thereof, the protective coating comprises a primer layer, and the primer layer comprises a component A and a component B, the component A is prepared from the following raw materials in parts by weight: 20 to 40 parts of phosphorylated-sulfur heterocyclic modified epoxy resin, 0.1 to 1 part of dispersing agent, 0.1 to 1 part of flatting agent, 0.1 to 1 part of defoaming agent, 0 to 10 parts of n-butyl alcohol, 0 to 10 parts of xylene, 10 to 15 parts of zinc phosphate, 0.5 to 1.0 part of thixotropic agent, 10 to 15 parts of flaky filler, 20 to 35 parts of talcum powder, 5 to 10 parts of barite powder and 3 to 10 parts of titanium dioxide; the component B is prepared from the following raw materials in parts by weight: 99 to 100 parts of amino resin and 0.3 to 0.8 part of a catalyst. Phosphorylation-sulfur heterocycle is utilized to modify epoxy resin, a phosphating group (P-O-C) is generated, the lipophobicity is increased, an intrinsic anti-swelling network is constructed based on a sulfur / phosphorus atom covalent bonding epoxy skeleton, and by utilizing the three-dimensional shielding effect of phosphorus atoms and the high-density cross-linking characteristic of thioether bonds, the anti-swelling performance of the epoxy resin is improved. Fuel oil permeation channels are blocked from the molecular level, pollutant dissolution is inhibited, and it is ensured that the coating has good soaking resistance to fuel oil.

The invention discloses a heat-conducting and insulating BN / Al2O3 / EVA photovoltaic packaging adhesive film, a preparation method and application, flaky boron nitride and spherical aluminum oxide are adopted as heat-conducting fillers, an ethylene vinyl acetate copolymer and the heat-conducting fillers are dispersed in xylene by adopting a high-speed shearing method, and glass is coated with the xylene in a blade coating manner, so that the heat-conducting and insulating photovoltaic packaging adhesive film is formed. The flaky boron nitride and the spherical aluminum oxide are in contact with each other to form a three-dimensional heat conduction path, and meanwhile, the shear strength of the packaging adhesive film is effectively improved due to the addition of the inorganic particles. The in-plane heat conductivity can reach 2.71 W / m.K, the out-plane heat conductivity can reach 1.01 W / m.K, heat conduction can be conducted quickly, and heat accumulation of the photovoltaic module is effectively relieved. Under the irradiation of sunlight, the photovoltaic module can be cooled by 2 DEG C, and the working voltage of 5 mV is increased. In addition, the packaging adhesive film has excellent electrical insulation property and mechanical property, and ensures stable and safe operation of the photovoltaic module in practical application.

The invention discloses weather-resistant and medium-resistant alkyd resin varnish and a preparation method thereof. The varnish is prepared from the following raw materials: modified alkyd resin, a composite drier, zirconium iso-octoate with the purity of 12%, an anti-skinning agent, 200 # solvent oil and xylene. The modified alkyd resin is prepared from the following raw materials: soya oil acid, pentaerythritol, benzoic acid, pyrrolidine-2-one-1-acetic acid, dimethylbenzene and a 200 # solvent. According to the invention, pyrrolidine-2-ketone-1-acetic acid is used as a binary acid component to partially or completely replace traditional phthalic anhydride, so that the reaction efficiency of alkyd resin synthesis can be improved, and the problems of yellowing, pulverization and poor water resistance of traditional alkyd resin can be solved; according to the varnish prepared by the invention, on the basis of maintaining the inherent gloss, flexibility and constructability of alkyd resin, the key properties such as weather resistance, water resistance and acid resistance are improved; the whole preparation process of the varnish continues to use mature alkyd resin production equipment and flow, and has good economical efficiency and industrial popularization prospects.

The application discloses a bifunctional catalyst for preparing p-xylene from carbon dioxide and hydrogen in one step, a preparation method and application, relates to the technical field of catalysts for preparing p-xylene from carbon dioxide and hydrogen, and opens up a new way for selectively hydrogenating carbon dioxide into high-value p-xylene; the application comprises alkali metal modified FeMn oxides and ZSM-5 capsule zeolites, and is used for converting CO2 into p-xylene through one-step hydrogenation; in the alkali metal modified FeMn oxides, Mn is dispersed on the oxide phase of Fe; the ZSM-5 capsule zeolites are subjected to hydrothermal treatment with a TPAOH solution, and the external passivated Bronsted acid sites of the ZSM-5 capsule zeolites can inhibit the structuralization reaction of dimethylbenzene; the bifunctional catalyst can realize the conversion of carbon dioxide into p-xylene in one step, has high carbon dioxide conversion rate, high space-time yield of p-xylene, and long catalyst service life.

The invention belongs to the technical field of coating protection, and particularly relates to a preparation method of a single-component high-temperature fast curing silver-aluminum polymer coating applied to the surface of a coating layer. Comprising 175-180 parts of modified epoxy resin; 95 to 100 parts of flaky aluminum silver powder; 180-200 parts of a mixed solvent of dimethylbenzene and / n-butyl alcohol; 100 to 120 parts of dicyandiamide; 25 to 40 parts of 3-(3, 4-dichlorophenyl)-1, 1-dimethylurea; 10 to 12 parts of sodium molybdate; 4-8 parts of graphite; 1 to 2 parts of polydimethylsiloxane; 2 to 6 parts of a wetting agent HY-352; 3-5 parts of fumed silica; 0.5 to 3 parts of dimethyl silicone oil; and 0.2-2 parts of a hydroxymethyl cellulose agent. The coating disclosed by the invention has the advantages of thin coating, high-temperature rapid curing, relatively good corrosion resistance, good combination with a coating layer and the like, and also has excellent storage stability.

The present application relates to the technical field of fine chemicals synthesis, and discloses a method for high-selectivity co-production of phthaloyl chloride and benzoyl chloride. The method uses dimethylbenzene and trichlorobenzene as raw materials, and feeds them into a photochlorination reaction tower to heat the materials. Then, the reaction tower is kept in a micro-negative pressure condition to perform photochlorination reaction. After the reaction is completed, the liquid is directly fed into a reaction kettle, and phthalic acid and a catalyst are added. Finally, the reaction liquid is separated by rectification to obtain the products phthaloyl chloride and benzoyl chloride. The present application greatly improves the selectivity of dimethylbenzene photochlorination reaction, and inhibits the ring chlorination side reaction. The present application can realize flexible co-production of m-phthaloyl chloride and p-phthaloyl chloride and benzoyl chloride, and can flexibly adjust the generation ratio of phthaloyl chloride and benzoyl chloride according to the raw material supply and product demand, thereby greatly improving the production flexibility of the reaction device.

The application discloses high-crack-following epoxy paint for concrete, a coating layer, a preparation method and application thereof. The high-crack-following epoxy paint comprises an A component composed of G-clay modified epoxy resin, polydopamine, a polymer elastomer, a wetting dispersant, a grafting coupling agent, an anti-settling agent, a pigment and filler, butanol and dimethylbenzene, and a B component composed of a flexible curing agent, butanol and dimethylbenzene. The A component and the B component are uniformly mixed to obtain the high-crack-following epoxy paint for concrete. The application further discloses a high-crack-following epoxy coating layer formed by curing the high-crack-following epoxy paint for concrete. The high-crack-following epoxy paint for concrete and the high-crack-following epoxy coating layer have excellent high-crack-following property and have application prospects in the field of concrete structure engineering in C5 harsh environment.

The invention relates to the technical field of coatings, and discloses a heat insulation coating for a heat exchanger and a preparation process thereof.The preparation process comprises the following steps that epoxy resin and modified cardanol are added into xylene, stirring is conducted for 10-15 min at the speed of 600-800 r / min, stirring is kept, a dispersing agent, a defoaming agent, modified graphene and titanium dioxide are sequentially added into the xylene, high-speed dispersion is conducted for 20-30 min, then the rotating speed is reduced to 300-500 r / min, stirring is conducted for 20-30 min, and the heat insulation coating for the heat exchanger is obtained. Adding hollow glass beads into the mixture, stirring at a low speed for 8-10 minutes, finally adding a curing agent, continuously stirring for 5-8 minutes, filtering, and standing to obtain the heat insulation coating for the heat exchanger. The prepared heat insulation coating for the heat exchanger has good heat insulation, water resistance and salt spray resistance.

The invention relates to the technical field of lubricating oil additives, and discloses an environment-friendly additive for replacing a phosphorus-chlorine antiwear agent.The preparation method comprises the following steps that base oil is added into a reaction kettle, stirring is conducted for 15-20 min at the temperature of 50-70 DEG C at the speed of 300-600 rpm, then molybdenum oleate, modified hydrotalcite, modified eugenol and octyl dimethylbenzene are sequentially added under continuous stirring, uniform mixing is conducted, and the additive is obtained. The environment-friendly additive for replacing the phosphorus-chlorine anti-wear agent is obtained. Under high temperature and high pressure generated by friction, molybdenum oleate can be decomposed to form a molybdenum disulfide solid lubricating film with low shear strength, so that the wear resistance of the additive is enhanced; stearic acid is used for modifying hydrotalcite, so that the anti-wear effect is synergistically enhanced; an organic silicon chain segment in the modified eugenol can provide auxiliary lubrication, and polar groups are adsorbed on the metal surface, so that the corrosion resistance of the additive is improved; and the additive does not contain phosphorus, chlorine and other harmful elements, and accords with the development direction of modern green manufacturing and environment-friendly lubrication.

The invention relates to a natural latex / graphene aerogel composite material for oil-water separation and a preparation method thereof. The preparation method comprises the following steps: firstly, preparing graphene oxide by an improved Hummers method, and then preparing the natural latex / graphene aerogel by combining a hydrothermal self-assembly method, a bubble template method and a freeze-drying method. And then adjusting the use amount of the natural latex and process parameters to optimize the performance of the natural latex / graphene aerogel, thereby preparing the natural latex / graphene aerogel with optimal performance. The preparation method has the beneficial effects that the problem of oil-water separation performance is solved, excellent adsorption performance is shown on organic reagents (ethanol, n-butane, liquid paraffin, trichloromethane, xylene, kerosene, edible oil, cyclohexane and the like), and the adsorption range is 43.82-189.86 g / g; after 10-20 times of cycle tests, the thickness recovery rate and the absorption capacity are still 92% or above of the initial value.

The reagent for detecting MHC-II expression of tumor cells in gastric cancer tissue comprises the following components in parts by mass: 10-30 parts of paraffin section preparation liquid, 2-10 parts of dewaxing liquid, 2-10 parts of sodium citrate antigen repair liquid, and 20-40 parts of immunohistochemical staining liquid; the dewaxing liquid comprises dimethylbenzene, and at least one of flavonol aminobenzoate derivative and sinapamide benzyl trimethylammonium benzoate salt; the flavonol aminobenzoate derivative has a nitrogen-containing group and a benzene ring, and the sinapamide benzyl trimethylammonium benzoate salt has a long-chain unsaturated alkane and a nitrogen-containing group. The reagent for detecting MHC-II expression of tumor cells in gastric cancer tissue can obtain high-quality immunohistochemical staining sections, thereby improving the sensitivity and specificity of MHC-II expression detection.

The application discloses a preparation method of a high entanglement and fatigue resistant polyolefin thermoplastic elastomer, and the material is prepared from the following raw materials: 100 parts of ETPO elastomer, 1-35 parts of ETPO-UHMWPE solution blending masterbatch, 1-10 parts of vinyl boron-containing crosslinking agent, 0.05-0.2 parts of antioxidant and 0.01-5 parts of initiator. First, the ETPO-UHMWPE solution blending masterbatch A is prepared by using hot dimethylbenzene; second, the vinyl boron-containing crosslinking agent B is prepared by using 1,4-benzene diboronic acid and 3-allyloxy-1,2 propanediol; then, the ETPO, the masterbatch A, the vinyl boron-containing crosslinking agent B, the antioxidant and the initiator are mixed in a mixer or an extruder; finally, the material is formed by secondary processing in a conventional polymer processing mode. The application creatively realizes the synergy of chain entanglement and vitrimer network, improves the tensile strength, fatigue resistance and use temperature, has the advantages of simple operation process, low production cost and repeatable processing, and adopts conventional polymer processing equipment, and has the industrial application potential.

The application discloses a kind of super-soft weather-resistant, fast solidification type polyurethane sealant and preparation method thereof, it is related to polyurethane sealant technical field, the sealant is obtained by mixing according to proportion by A component and B component;The A component is composed of modified polyurethane prepolymer, first plasticizer, dimethylbenzene, first filler, gamma-glycidyl ether oxygen propyl trimethoxysilane, water-removing agent and isocyanate curing agent;The B component is composed of second 3 functionality polyether polyol, second filler, second plasticizer, organic tin catalyst and delay catalyst;The modified polyurethane prepolymer is prepared by tackifying resin, terminal hydroxyl polybutadiene and first 3 functionality polyether polyol;The sealant of the application can realize stable bonding to neoprene and polyurethane base material, and shows excellent high and low temperature resistance and curing-operation balance performance, effectively solve the contradiction between the curing speed and operating performance of existing polyurethane sealant, improve product application practicability.

The invention discloses a nucleic acid extraction and purification reagent, a kit and a use method. Reagents of the kit comprise a cell lysis solution, a digestive enzyme, a binding solution, a rinsing solution and an eluent, wherein the binding solution contains an alcoholic solution and sodium salt. Compared with similar kits on the market, the kit provided by the invention has the advantages that a sodium salt reagent is also added in the binding solution besides an alcoholic solution, meanwhile, the mass ratio of sodium salt is optimized, the DNA extract can be efficiently and selectively adsorbed on a centrifugal column silicon matrix membrane by adding the reagent, the yield and purity of obtained nucleic acid are remarkably improved, and the kit is suitable for large-scale popularization and application. Meanwhile, the component NaCl of the lysate is optimized and reduced, and the steps in the preparation and production process are reduced. The reagent / kit is simple in composition and low in cost, the operation method is simple and convenient, large-scale nucleic acid extraction operation is facilitated, in addition, the kit does not contain toxic and harmful reagents such as methylbenzene, dimethylbenzene, phenol and chloroform, harm to the environment and operators is small, and the modern environmental protection concept is better met.

The application belongs to the field of paint, and particularly discloses PU white primer, a preparation method and application thereof. The PU white primer comprises A component, B component and C component. The A component comprises hydroxyl acrylic acid resin, castor oil, dispersing agent, defoaming agent, cyclohexanone, silicon dioxide, titanium white powder, talcum powder, calcium carbonate, butyl acetate, leveling agent, organic tin and propylene glycol methyl ether acetate. The B component comprises butyl acetate, HDI trimer and isocyanate prepolymer. The C component comprises dimethylbenzene, butyl acetate, propylene glycol methyl ether acetate and dimethyl carbonate. The PU white primer has the advantages of water resistance, high temperature resistance, adhesion, adhesion, hiding power and strong flexibility, and has superior comprehensive performance, is green and safe, low in cost, and is very suitable for being used as wood and stone surface primer in kitchens, bathrooms and the like.

An ion chromatogram of a gas component generated by heating the phenolic resin foam at 600 DEG C is obtained by gas chromatography-mass spectrometry. The area ratio Z (Z = X / Y) of the total X (X = A + B + C) of the area A of the dihydroxybenzene derived from the pyrolysis product, the area B of the dihydroxytoluene derived from the pyrolysis product, and the area C of the dihydroxyxylene derived from the pyrolysis product to the area Y of the pyrolysis product representing the structure derived from urea crosslinking is within the range of formula (1). The phenolic resin foam has a thermal conductivity of 0.0240 W / (m.K) or less in an environment of 23 DEG C. 0.035 < = Z < = 0.715 (1)

The invention discloses modified alkyd resin enamel paint and a preparation method thereof, and relates to the technical field of alkyd resin paint. The modified alkyd resin enamel paint is prepared from the following raw materials: fluorosilicone acrylic acid composite modified alkyd resin, scarlet powder, precipitated barium sulfate, a composite drier, zirconium iso-octoate with the purity of 12%, an anti-skinning agent and xylene. The fluorosilicone acrylic acid composite modified alkyd resin is prepared from basic alkyd resin, an acrylic acid prepolymer, vinyltriethoxysilane, 4-(2, 2-difluoroethyl) benzoic acid, an initiator, a solvent and a catalyst. The fluorosilicone acrylic acid composite modified alkyd resin is formed through step-by-step reaction of the acrylic acid prepolymer, the vinyltriethoxysilane and the 4-(2, 2-difluoroethyl) benzoic acid, so that the weather resistance, the water resistance, the pollution resistance and the adhesive force of a coating are improved, the modified alkyd resin still has good leveling property, the cost is prevented from being out of control, and the service life of the coating is prolonged. And both economy and practicability are considered.

The present application belongs to the technical field of polymer materials, and particularly relates to a porous conductive epoxy resin composite material and a preparation method and application thereof. The material comprises the following components: 30 parts of epoxy resin E44, 10-50 parts of dimethylbenzene, 0.398-1.587 parts of expanded microspheres, 0-3.035 parts of multi-walled carbon nanotubes and 9.675 parts of polyether amine curing agent T403. In the present study, expanded microspheres (EM) and multi-walled carbon nanotubes (CNT) are simultaneously introduced into the epoxy resin matrix as composite fillers, and a lightweight porous conductive epoxy resin composite material (PCEP) with high conductivity is successfully prepared. Specifically, lightweight EM with a unique closed pore structure is selected as a foaming and weight-reducing filler, which can significantly reduce the overall density of the composite material while maintaining the high strength and high toughness of the epoxy matrix, and the pore size and distribution can be accurately controlled. Then, high-quality dispersed CNT is uniformly introduced into the system, and by constructing a continuous and efficient conductive channel, the conductivity of the composite material is significantly improved.

The utility model relates to the technical field of chemical engineering, in particular to an adsorption device circulating water system which comprises a circulating water pool, a circulating water pipeline, a circulating water pool outlet line, a water suction pool, a first branch line, a second branch line and a water suction pool outlet line, the circulating water pipeline is from a xylene rectification separation system and is connected to an inlet of the circulating water tank; a first filter and a first circulating water pump are sequentially arranged on the circulating water tank outlet line; one end of the first branch line is connected to the pool outlet line, and the other end of the first branch line is connected to an inlet I of the water suction pool through a water collecting pool. The problems of insufficient return water pressure, reduced tail end pressure, unsmooth circulating water and the like of a xylene rectification separation system are solved, the tail end pressure of the circulating water is improved, the quality of the circulating water is improved, and the temperature of a circulating water system in summer is reduced.

The invention relates to the technical field of antistatic agents, and particularly discloses an oil product antistatic agent and a preparation method thereof. The antistatic agent comprises the following raw materials: octadecylamine, modified AMPS, tetraethylammonium chloride, deionized water, dual-modified polyether, xylene, methanol, a low-temperature stabilizer and an initiator, the modified AMPS is obtained by modifying AMPS through a low-temperature modifier, and the low-temperature modifier comprises glycerol and urea; the dual-modified polyether is a product obtained by modifying polyoxyethylene polyoxypropylene ether with ammonia gas and butanol. The antistatic agent provided by the invention has good low-temperature stability, and can be well adapted to winter oil storage and transportation scenes in northern alpine regions.

The invention discloses an aromatic hydrocarbon alkylation catalyst as well as a preparation method and application thereof. The catalyst comprises: 10 to 90 parts of a ZSM-5 molecular sieve; 0.05-10 parts of at least one selected from Co, Mo and La in terms of metal oxide; and 20-60 parts of a binder component. In an XRD diagram of the ZSM-5 molecular sieve, characteristic diffraction peaks of crystal faces (101), (200), (501) and (303) are broadened, and the aspect ratios of the broadened diffraction peaks are independently selected from 2-7. When the catalyst is used in a reaction for preparing C8 aromatic hydrocarbon, unsym-trimethylbenzene can be co-produced, and meanwhile, the content of m-xylene in xylene and the content of ethylbenzene in the C8 aromatic hydrocarbon are reduced, so that the quality of the product C8 aromatic hydrocarbon is improved.

A synthesis method of biphenyltetracarboxylic acid by using a palladium-iron bimetallic catalyst belongs to the field of synthesis of biphenyltetracarboxylic acid, and comprises the following steps: 1, introducing a protective gas, exhausting air, adding xylene and bromo-p-xylene into a solvent A under the atmosphere of the protective gas, adding the palladium-iron bimetallic catalyst and an alkaline agent, and carrying out a reaction to obtain a reaction product A; after the reaction, an intermediate 3, 3 ', 4, 4'-tetramethyl biphenyl is obtained; and 2, carrying out oxidation reaction on the 3, 3 ', 4, 4'-tetramethyl biphenyl in a fixed bed reactor to obtain the biphenyltetracarboxylic acid. In the synthesis process of the biphenyltetracarboxylic acid, the novel palladium-iron bimetallic catalyst is adopted, the reaction steps are simpler than those of a traditional method, in the reaction of constructing a biphenyl skeleton, by means of the high selectivity of the palladium-iron bimetallic catalyst, side reactions are effectively reduced, and the yield of the intermediate 3, 3 ', 4, 4'-tetramethyl biphenyl is increased.

The application relates to the technical field of piston rods, in particular to a high-wear-resistance piston rod based on a gas spring and a preparation method thereof. The application comprises the following steps: S1, pretreating a piston rod by removing oil and grease, cleaning and drying to obtain a pretreated piston rod; S2, forming a cladding layer by cladding cladding powder on the surface of the pretreated piston rod through a laser cladding process; S3, uniformly mixing epoxy resin and dimethylbenzene, adding a composite, a curing agent, a leveling agent and a defoaming agent to obtain wear-resistant paint; and S4, coating the wear-resistant paint on the surface of the cladding layer, drying and curing to form a wear-resistant coating and obtain the high-wear-resistance piston rod. The high-wear-resistance piston rod prepared by the application has excellent wear resistance and surface hardness, and can effectively reduce the friction coefficient, thereby prolonging the service life.

The invention belongs to the technical field of waste liquid recovery, particularly relates to an efficient activated carbon assembly, a waste liquid recovery device for the pathology department and a use method of the waste liquid recovery device, and aims at solving the problems that solid-liquid separation of waste liquid is not thorough, the separation and recovery efficiency of ethyl alcohol and xylene is low, and xylene steam leaks when the activated carbon assembly is replaced. The device comprises a shell, a top cover plate, an adsorption structure and the like, the adsorption structure is provided with an activated carbon layer and a partition plate with through holes, the device further comprises a liquid storage tank, a filter tank and the like, the liquid storage tank is provided with a slope sieve plate and a separation structure, solid-liquid separation and ethanol separation can be achieved, the filter tank is provided with a replacement structure, and an activated carbon assembly can be replaced by rotating an upper rotating disc. Residual xylene steam flows back and is then adsorbed by utilizing a trapezoidal plate, an L-shaped rod and the like, and the device improves the waste liquid treatment efficiency, reduces the leakage of harmful substances and ensures the safety of an operation environment.