452 results about "Dimethyl carbonate" patented technology

The invention relates to the field of chemical synthesis, in particular to a production process of allyl diethylene glycol dicarbonate, which comprises the following steps: by taking allyl alcohol and dimethyl carbonate as raw materials, carrying out transesterification under the action of a core-shell catalyst to generate dipropylene carbonate; carrying out solid-liquid separation, carrying out reduced pressure distillation to recover methanol and dimethyl carbonate, and then carrying out second-step ester exchange reaction with diethylene glycol under the action of the same catalyst to generate allyl diethylene glycol dicarbonate; and finally, performing multi-stage reduced pressure distillation purification to obtain a high-purity product. According to the core-shell type catalyst, an MCM-41 molecular sieve is used as a carrier, an inner core is formed after amino modification and zirconium ion coordination, then an interface layer and a phenyl modified silicon dioxide shell are used for packaging, and the core-shell type catalyst has high activity, high selectivity and excellent structural stability. The method has the advantages of mild process conditions, recyclable catalyst, high product yield and excellent purity, and is suitable for industrial production.

The invention belongs to the technical field of copolymerization modification of degradable polyester, and relates to a depolymerization method and application of polybutylene terephthalate. During depolymerization, polybutylene terephthalate, dimethyl carbonate and dihydric alcohol are mixed and then subjected to a depolymerization reaction, and an intermediate ester is prepared; the dihydric alcohol is dihydric alcohol which does not form a ring with dimethyl carbonate in the depolymerization reaction process; the molar weight of the dimethyl carbonate is 10-30% of the molar weight of a repetitive unit of the polybutylene terephthalate; the sum of the molar weight of a 1, 4-butanediol unit in the polybutylene terephthalate and the molar weight of the added dihydric alcohol is a, the sum of the molar weight of a terephthalic acid unit in the polybutylene terephthalate and the molar weight of the added dimethyl carbonate is b, and the ratio of b to a is (1.2-1.5): 1; during application, the prepared intermediate ester is subjected to transesterification under the condition of negative pressure to obtain the copolyester. The depolymerization method is simple and easy to implement; the depolymerization product can be directly applied.

The application provides a battery monomer, a battery device and a power utilization device. The battery monomer comprises a positive electrode sheet, a separator, a negative electrode sheet and an electrolyte. The positive electrode sheet and the negative electrode sheet are stacked, and the separator is arranged between the positive electrode sheet and the negative electrode sheet. The positive electrode sheet comprises a positive electrode main body part and a positive electrode tab part. The ratio of the long side size to the short side size of the positive electrode main body part is (3-8):1. The negative electrode sheet comprises a negative electrode main body part and a negative electrode tab part. The long side of the negative electrode main body part exceeds the long side edge of the positive electrode main body part by 2-9 mm. The long side of the separator exceeds the long side edge of the negative electrode main body part by 2-10 mm. The electrolyte comprises a solvent. The solvent comprises one or more of dimethyl carbonate and a linear carboxylic acid ester having a structure shown in formula (1). In formula (1), R1 and R2 each independently comprises a C1-C5 alkyl or a halogenated alkyl. The battery monomer has a high energy density, good cycle performance and low self-discharge.

According to the method, industrial-grade 1, 2-propylene glycol co-produced by a dimethyl carbonate process through a transesterification method is taken as a raw material, and purification processes of activated carbon adsorption impurity removal, deodorant impurity removal and rectification impurity removal are carried out, so that various indexes such as chromaticity, odor, purity and ultraviolet light transmittance of the obtained 1, 2-propylene glycol product reach the quality indexes of an imported pharmaceutical-grade 1, 2-propylene glycol product. According to the method disclosed by the invention, the pharmaceutical grade propylene glycol can be prepared with high quality, and a good development prospect and huge economic benefits are undoubtedly brought to the propylene glycol industry.

The invention relates to the technical field of printing materials, in particular to an environment-friendly silk-screen printing ink diluent based on propylene carbonate and dimethyl carbonate, which comprises dimethyl carbonate and propylene carbonate, and the dimethyl carbonate and the propylene carbonate are compounded according to a certain proportion. The diluent further comprises a synergistic solvent and a functional additive which are added according to a certain proportion. The environment-friendly silk-screen printing ink diluent formula for silk-screen printing ink and the preparation method of the environment-friendly silk-screen printing ink diluent formula are particularly suitable for viscosity adjustment and printability optimization of solvent type oil black, have the characteristics of low volatility and high solubility, and solve the problems of high toxicity of a traditional solvent, poor stability of a compound system, insufficient printability and the like.

The invention relates to a double-self-repairing hydroxyl acrylic coating and a spraying process thereof, and belongs to the technical field of coatings. Comprising 50 to 60 parts of a hydroxy acrylic resin-furan modified copolymer, 5 to 10 parts of a maleimide compound, 3 to 8 parts of propylene glycol methyl ether acetate, 5 to 10 parts of dimethyl carbonate, 5 to 8 parts of polyurethane microcapsules, 5 to 7 parts of carbon black, 2 to 5 parts of modified titanium dioxide, 0.8 to 1.2 parts of a modified polyether siloxane leveling agent and 0.2 to 0.4 part of an organic bismuth-zinc composite drier. 2 to 5 parts of fumed silica; and 1 to 2 parts of nano montmorillonite. The paint provided by the invention can form a uniform and continuous coating on the surface of a base material. When the coating is damaged by scratches and the like, self-repairing can be achieved through double mechanisms. According to the spraying process, the polyurethane microcapsules and the matrix resin are separately mixed, and breakage caused by direct mixing of the microcapsules and the resin can be effectively avoided.

An electroconductive pressure-sensitive adhesive tape includes at least an electroconductive pressure-sensitive adhesive layer containing at least a rubber component and electroconductive particles. The rubber component contains a polyisobutylene (A) having a viscosity average molecular weight of 400,000 or more and 800,000 or less and a polyisobutylene (B) having a viscosity average molecular weight of 100,000 or less. The electroconductive pressure-sensitive adhesive tape achieves both a superior adhesive property and a high swelling resistance to an electrolyte layer, especially, a high swelling resistance to an electrolyte layer containing dimethyl carbonate.

The invention discloses a wide-voltage wide-temperature-range sodium-ion battery electrolyte and a preparation method and application thereof, and belongs to the technical field of sodium-ion battery electrolytes.The wide-voltage wide-temperature-range sodium-ion battery electrolyte comprises sodium salt, an organic solvent and an additive, the organic solvent is selected from one or more of ethylene carbonate, propylene carbonate, ethyl methyl carbonate, dimethyl carbonate, diethyl carbonate, ethylene glycol dimethyl ether, diethylene glycol dimethyl ether and triethylene glycol dimethyl ether, and the additive is selected from one or more of fluoroethylene carbonate, allyl-1, 3-propane sultone, 1, 3-propylene sultone, 1, 3-propylene sultone and 1, 3-propylene sultone. The additive is one or more of 1, 3-propyl sultone, methylene methane disulfonate, ethylene sulfate, trifluoromethanesulfonic anhydride, pentaerythritol bicyclic sulfate, tri (trimethylsilane) phosphate, tri (trimethylsilane) phosphite, tri (trimethylsilane) borate, acesulfame sodium and aluminum trifluoromethanesulfonate, and the additive is one or more of 2, 3-propylene sultone, methylene methane disulfonate, ethylene sulfate, trifluoromethanesulfonic anhydride, pentaerythritol dicyclosulfate, tri (trimethylsilane) phosphate, tri (trimethylsilane) phosphite, tri (trimethylsilane) borate, tri (trimethylsilane) phosphate and tri (trimethylsilane) borate. The electrolyte provided by the invention not only keeps high coulombic efficiency at low temperature, but also has good cycle stability at high temperature.

The invention discloses a sodium-ion battery electrolyte and a preparation method thereof, and relates to the technical field of sodium-ion batteries, the electrolyte comprises a sodium salt, a composite solvent, an additive and an auxiliary agent, the sodium salt is formed by compounding sodium bis (fluorosulfonyl) imide, sodium bis (trifluoromethanesulfonyl) imide and modified sodium bis (oxalato) borate, and the composite solvent is formed by compounding sulfolane, 1, 3-butanediol, 1, 3-butanediol, 1, 3-butanediol, 1, 3-butanediol, 1, 3-butanediol, 1, 3-butanediol, 1, 3-butanediol, 1, 3-butanediol and 1, 3-butanediol. The auxiliary agent is nano-scale ZIF-8, the additive is 1, 3-propylene glycol dimethyl ether, dimethyl carbonate, fluoroethylene carbonate and ethyl acetate, the additive is modified 1, 3-propane sultone, trimethyl phosphate and hydroquinone dimethyl ether, and the auxiliary agent is nano-scale ZIF-8. According to the electrolyte, sodium bis (oxalato) borate is modified after being treated by hydrogen peroxide and has efficient hydrofluoric acid resistance, meanwhile, hydrofluoric acid generated by the reaction of fluorine-containing sodium salt and water in the electrolyte can be specifically removed by utilizing an auxiliary agent of the nano ZIF-8 and a synergistic effect formed by the sodium salt and the auxiliary agent, and damage of the hydrofluoric acid to a negative electrode SEI film is avoided; and the cycle life of the sodium ion battery is prolonged.

The application discloses an alkali ion type covalent organic framework material and a preparation method and application thereof, wherein 2,4,6-tris(4-formylphenyl)-1,3,5-triazine, 1,4-diisocyanobenzene and 2-aminopyridine are used as building units, a covalent organic framework containing pyrimidine is obtained through a condensation reaction, and then a quaternary ammonium reaction and an ion exchange reaction are sequentially performed to obtain the alkali ion type covalent organic framework.The alkali ion type covalent organic framework material prepared by the application has rich alkali sites, developed pore structures and good chemical stability, exhibits good catalytic performance as a catalyst for one-pot preparation of dimethyl carbonate from CO2, an epoxide compound and methanol, and also shows good cycle stability.

The application discloses a kind of carbon dioxide methyl ester raw gas purification filter pollution devices, it includes horizontally arranged cylinder, coaxial tower type ladder filter assembly and translation pneumatic purging assembly are arranged in the cylinder, the tower type ladder filter assembly includes several end face filter parts and cylinder filter parts that are alternately connected in sequence;The beneficial effects of the application: the tower type ladder filter assembly of the application is designed to filter carbon dioxide methyl ester raw gas, the tower structure can effectively increase the filter area, thereby improving the filtering efficiency;Tower type ladder filter assembly has matching end face filter parts and cylinder filter parts, with axial airflow and radial airflow filtering function, according to the gas direction to axial filtration as main, radial filtration as auxiliary, long service life;According to the actual use characteristics of end face filter parts and cylinder filter parts, design translation pneumatic purging assembly and spray cleaning assembly to clean tower type ladder filter assembly, cleaning is fast and efficient.

The invention relates to a method for continuously synthesizing methyl trifluoroethyl carbonate through three-stage series connection, which comprises the following steps of: reacting dimethyl carbonate and chlorine in the presence of an activated carbon loaded ferric trichloride catalyst, introducing into a gas-liquid separator after the reaction is ended, separating to obtain reaction feed liquid a and unreacted chlorine, and returning the unreacted chlorine to continue the reaction; sufficiently mixing a 50wt% sodium hydroxide solution, trifluoroethanol and the reaction material liquid a, and then carrying out constant-temperature reaction to obtain a reaction material liquid b; methanol and the reaction feed liquid b are fully mixed for a reaction, after the reaction is finished, a reaction product is taken out, a lower-layer methyl trifluoroethyl carbonate crude product is obtained through separation and then rectified and purified in a rectifying tower, and finally high-purity methyl trifluoroethyl carbonate is obtained. Through the design of the micro-channel reactor and the gas-liquid separator, use and recovery of chlorine are effectively controlled, and the safety risk is reduced; meanwhile, the separation cost is low, the energy consumption is reduced, and the high-purity methyl trifluoroethyl carbonate is obtained.

The present invention relates to a method of preparing a heterogeneous linear carbonate, the method including performing a transesterification reaction of dimethyl carbonate (DMC) and ethanol (EtOH) in the presence of a catalyst, wherein the catalyst is one or more selected from the group consisting of lithium methoxide (LME), lithium ethoxide (LEE), sodium methoxide (SME), sodium hydroxide (NaOH), and a mixture thereof, and the catalyst is input in a state of being dissolved in a sulfoxide-based solvent.

This invention relates to an alcohol-based fuel additive, its preparation method, and its application, belonging to the technical field of diesel fuel additives. The additive, by weight, comprises: a mixture of C3-C10 fatty alcohols, fatty acid methyl esters, methyl tert-butyl ether, isoamyl nitrate, dimethyl carbonate, and diesel fuel. The mass ratio of methyl tert-butyl ether to dimethyl carbonate is [value missing]. This invention employs a stepped feeding process, solving the problem of combustion improver failure caused by high shear heat generation by cooling the fuel before adding isoamyl nitrate, and ensuring long-term fuel stability at -10°C using a specific polarity gradient ratio. The fuel prepared by this invention has a high cetane number, strong power, and good anti-stratification effect, making it suitable for compression ignition engines.

The present application relates to a kind of preparation method of trifluoromethyl pyrazole compound, belong to the technical field of organic synthesis.The specific method is: (1) trifluoroacetyl ethyl acetate is first with hydrazine hydrate cyclization reaction and generates compound of formula III;(2) under the catalysis of base, compound of formula III is reacted with difluoromethylation reagent and generates compound of formula II;(3) compound of formula II is reacted with methylating agent and obtains compound of formula I;The difluoromethylation reagent is difluoro-monochloromethane or sodium difluoro-monochloroacetate;The methylating agent is chloromethane, bromomethane, iodomethane, dimethyl sulfate or dimethyl carbonate.The present application is prepared by changing reaction route, and the higher-priced raw material methylhydrazine is replaced, and isomer impurity is no longer generated in the product prepared.Not only raw material cost is reduced, but also the purity of product is improved.

SOLVENT COMPOSITIONS The present invention relates to a solvent composition for solvent-based paints or other coatings characterized in that it comprises a combination of dimethyl glutarate and at least one other compound selected from isobutyl acetate, ethyl lactate, dimethyl 2-methylglutarate, 2-methyltetrahydrofuran, ethyl acetate, cyclopentyl methyl ether, dithoxymethane, dimethyl carbonate, dimethyl succinate, benzyl alcohol, dimethyl adipate, and glyceryl triacetate. Fig. 1

Lithium secondary battery, comprehensive a positive electrode, a negative electrode, a separator and a non-aqueous electrolyte, wherein: the positive electrode comprises a positive electrode active material, wherein the positive electrode active material comprises lithium iron phosphate particles and the positive electrode has a loading amount of 450 mg / 25 cm² 2 up to 740 mg / 25 cm 2 exhibits; and the non-aqueous electrolyte comprises a lithium salt, an organic solvent and an additive, wherein the organic solvent comprises a solvent based on a cyclic carbonate and a solvent based on a linear carbonate, wherein the solvent based on a cyclic carbonate comprises ethylene carbonate and the solvent based on a linear carbonate comprises dimethyl carbonate, the additive comprises vinylene carbonate and the dimethyl carbonate is present in an amount of 5 vol% to 75 vol% in the organic solvent and the weight ratio of vinylene carbonate to dimethyl carbonate is greater than 0 to 0.2 or less.

The application discloses a preparation of isosorbide catalyst and its preparation method and application. The catalyst is an organic / inorganic hybrid material, wherein the organic component comprises a functional group containing two or more N atoms and a hydrophobic group without nitrogen, and the inorganic component is a mesoporous silica material. The catalyst provided by the application is applied to the reaction of sorbitol and dimethyl carbonate to prepare isosorbide, and has high catalytic performance.

The invention provides yellow glue resistant to corrosion of a plasticizer and a preparation method of the yellow glue. The yellow glue is prepared from a polyurethane prepolymer, a chloroprene rubber sheet, methyl methacrylate, benzoyl peroxide, an anti-aging agent, butanone, cyclohexane, dimethyl carbonate and tackifying resin. The polyurethane prepolymer is prepared from the following components in parts by weight: 10 to 14 parts of 1, 4-butanediol adipic acid polyester polyol, 4 to 8 parts of polycaprolactone polyol, 1 to 3 parts of diphenylmethane diisocyanate, 0.05 to 0.15 part of 1, 6-hexanediol, 1 to 2 parts of hydroxyethyl methacrylate, 0.01 to 0.03 part of organic bismuth catalyst and 75 to 80 parts of butanone. The polyurethane prepolymer with specific crystallization performance is synthesized through cooperation of polycaprolactone polyol and polyester polyol, and the yellow glue is endowed with excellent plasticizer corrosion resistance and low-temperature activation capacity. Active groups in the polyurethane prepolymer are subjected to graft copolymerization with the chloroprene rubber adhesive and MMA, and a plasticizer-resistant polyurethane chain segment is introduced into a molecular chain of the chloroprene rubber adhesive, so that a hard segment-soft segment alternating block structure is formed, and corrosion resistance and viscoelasticity are both considered.

The invention discloses a preparation method of a high-transparency TPE (thermoplastic elastomer) peristaltic pump pipe, and belongs to the technical field of high-molecular compounds. The preparation method comprises the following steps: blending high cis-1, 4-polybutadiene and polyethylene-polybutadiene to prepare a matrix phase; the method comprises the following steps: carrying out ester exchange reaction on dimethyl carbonate and polypropylene oxide glycol; then adding ethylene glycol as a chain extender to synthesize a polyurethane phase; carrying out melt blending on the two phases at a specific temperature, and adding dicumyl peroxide to initiate selective crosslinking; and finally, carrying out low-temperature and low-pressure extrusion molding to obtain the high-transparency TPE peristaltic pump pipe. By in-situ formation of an interpenetrating polymer network structure, nanoscale microphase separation is realized, so that the prepared pipe has high transparency, excellent fatigue resistance, excellent wear resistance and good chemical resistance at the same time. The method solves the industrial problem that a traditional peristaltic pump pipe is difficult to meet multiple high-performance requirements, and is suitable for the high-added-value fields such as biological pharmacy and precise instruments.

The application discloses a sensor with a bionic olfactory positioning function, comprising a gate electrode, a dielectric layer and an electrode; the dielectric layer is arranged between the gate electrode and the electrode; and the dielectric layer comprises a porous structure zwitterionic polymer film. Through the combination of the high sensitivity of the sensor to dimethyl carbonate (DMC) and the application method, accurate positioning of a DMC leakage position is realized, and meanwhile, the sensor has the characteristics of high sensitivity, durability and excellent intelligent bionic positioning, and overcomes the positioning function that traditional sensors do not have.

The utility model relates to the field of catalyst recycling technology, especially relates to a carbonic acid dimethyl ester synthesis is with catalyst recycling device. Including recovery jar, the recovery jar is installed with the stirring assembly for stirring catalyst, the recovery jar is installed with the heating assembly for heating catalyst, recovery assembly is installed on the recovery jar for recycling the hot air of discharge, the utility model discloses through the setting of recovery assembly, and the recovery jar exhausts the hot and humid gas and exchanges heat with the outside air in the heating box, and the preheating of air is carried out, thereby reducing the temperature difference of the air that advances the wind and heats to dry exhaust air, realizes the recycling of the waste heat in the hot and humid gas, reduces the energy waste that the direct discharge of heat causes, and reduces the energy consumption cost of heating process.

The present invention relates to a catalyst for methanol liquid phase oxidative carbonylation to synthesize dimethyl carbonate, and its preparation method and application. The catalyst is a MOFs derivative, and the metal oxide is dispersed on a carbon carrier. The metal oxide is CuO X The MOFs derivative is CuO obtained by calcining Cu-MOF. X Dispersed on a carbon support, the MOF derivative is used in an amount of 1.3% to 3.8% of the amount of methanol used. Compared to existing technologies, this invention leverages the advantages of MOFs, such as adjustable metal nodes and ligand structures, large specific surface area, and diverse structures. The resulting derivatives after calcination also have the advantages of high specific surface area and highly dispersed metal oxides on the carbon support.

This invention discloses a method for synthesizing cefotiam, using 7-aminocephalosporanic acid (7-ACA) as the parent nucleus and introducing a 4-dimethylaminopyridine-dimethyl carbonate composite catalytic system. The reaction is carried out in a one-pot process involving 3-position nucleophilic substitution, 7-position amidation, and simultaneous deprotection in a green mixed solvent of ionic liquid [BMIM]BF₄-water with 1-(2-dimethylaminoethyl)-1H-5-mercapto-tetrazole and compound I. This method simplifies the process, improves selectivity, produces a high-purity product with stable yield, and is suitable for industrial production.

The invention discloses a hand brushing and spraying dual-purpose odorless anti-yellowing transparent polyurethane primer suitable for various base materials and a preparation method thereof. The primer mainly comprises a component A, a component B and a component C, the component A is mainly prepared from odorless coconut oil alkyd resin, zinc stearate, a defoaming agent, a flatting agent, an anti-settling agent, functional resin and an organic solvent; the component B is mainly prepared from an HDI (hexamethylene diisocyanate) tripolymer, a TDI (toluene diisocynate) tripolymer, a dehydrating solvent and a dehydrating agent; the component C is mainly prepared from dimethyl carbonate, n-butyl acetate and propylene glycol methyl ether acetate; the anti-settling agent is a mixed solution of polyamide wax slurry 6900-20X and n-butyl acetate, and the mass concentration of the polyamide wax slurry 6900-20X in the mixed solution is 40%; the functional resin is a mixed solution of cellulose acetate butyrate CAB-381-0.5 and n-butyl acetate, and the mass concentration of the cellulose acetate butyrate CAB-381-0.5 in the mixed solution is 20%. The odorless yellowing-resistant transparent polyurethane primer has the advantages of no blistering, no prickly heat, suitability for various base materials, dual purposes of hand brushing and spraying, and the like.

The utility model relates to carbonic acid dimethyl ester production technical field, and disclose a kind of carbonic acid dimethyl ester production device of continuous feeding, the bottom surface of feed hopper is fixedly installed with conveying pipe, the inside of conveying pipe is fixedly installed with gear, the outside of gear is engaged to be connected with transmission crawler belt, the side surface of transmission crawler belt is fixedly installed with hopper, the bottom surface of conveying pipe is fixedly installed with discharge hopper, the bottom surface of discharge hopper is fixedly installed with recombinant component separation device.This carbonic acid dimethyl ester production device of continuous feeding, raw material is entered into conveying pipe by feed hopper, in conveying pipe, raw material will fall into hopper, hopper is driven by gear to transport raw material by transmission crawler belt, compared with ordinary transmission device, transmission crawler belt can adapt to bending lifting operation, and it has longer service life, and individual component can be replaced and repaired, maintenance cost is also lower in later period, hopper not only can transport solid raw material, but also can transport liquid raw material.

The invention belongs to the technical field of catalyst preparation, and particularly relates to a preparation method of a novel NaY molecular sieve supported palladium and metal additive catalyst for co-production of dimethyl carbonate, the catalyst mainly comprises 0.1-3.0% by mass of Pd active component, 0.1-10.0% by mass of metal additive and 0.1-10.0% by mass of NaY molecular sieve carrier. The metal auxiliary agent not only effectively eliminates acid in the catalyst, but also promotes the generation of high-valence Pd active species, and the Pd active species are stabilized by utilizing the electron withdrawing effect of the auxiliary agent on the Pd active species. The catalyst is applied to a reaction for synthesizing dimethyl carbonate by carbonylation of methyl nitrite in a process of co-producing ethylene glycol from coal and co-producing dimethyl carbonate, shows excellent catalytic performance, and has certain industrial application prospects.

The invention discloses a triphosgene continuous synthesis method and device, and belongs to the technical field of fine chemical production. The triphosgene continuous synthesis method comprises the following steps: S1, continuously conveying dimethyl carbonate to the lower part of a reactor, and continuously inputting chlorine from the bottom of the reactor; s2, after dimethyl carbonate and chlorine are mixed in a reactor, a reaction is initiated by irradiation of an ultraviolet light source with the wavelength of 295-395 nm, and molten triphosgene and hydrogen chloride gas are generated; wherein the temperature in the reactor is gradually increased from bottom to top to present a temperature gradient; and S3, continuously overflowing the molten-state triphosgene into a degassing tower to remove residual hydrogen chloride in vacuum, and enabling the degassed molten-state triphosgene product to enter a flaking section. According to the method, by optimizing reaction conditions and equipment design, the cost can be reduced, the utilization rate of raw materials can be increased, generation of byproducts can be reduced, meanwhile, the safety and efficiency of the reaction are guaranteed, and efficient, safe and continuous production of triphosgene is achieved.

The preparation method comprises the following steps: mixing aliphatic diol with dimethyl carbonate, adding isophorone diisocyanate and a carboxyl-containing chain extender, and adding a neutralizing agent and an organic solvent, so as to obtain a water-based polycarbonate emulsion; adding a phosphate-containing chain extension monomer into the high-molecular-weight polycarbonate polyol intermediate, heating for condensation polymerization to obtain phosphate-containing active resin, and heating the low-molecular-weight polycarbonate polyol intermediate and alkylsilane for condensation polymerization to obtain a silane modified polycarbon oligomer; the preparation method comprises the following steps: mixing a water-based polycarbonate emulsion, phosphate-containing active resin and a silane modified polycarbon oligomer, and adding a nano inorganic filler to obtain a water-based high-activity polycarbon coating; after the water-based high-activity poly-carbon coating is applied to the surface of a base material, a water-based high-activity poly-carbon coating is formed on the surface of the base material. The problems of adhesion attenuation and coating blistering and falling under high-temperature and high-humidity conditions are effectively inhibited.

The utility model relates to rectifying tower technical field, and disclose a kind of rectifying tower reboiler for dimethyl carbonate production, including reboiler main body, the bottom of reboiler main body is fixedly connected with liquid inlet pipe, the top of reboiler main body is fixedly connected with gas outlet pipe, the side of reboiler main body upper end is fixedly connected with steam inlet pipe, the side of reboiler main body lower end is fixedly connected with condensate outlet pipe, the other side of reboiler main body lower end is fixedly connected with two connecting pipes, the other end of two connecting pipes is connected with replacement component, the other end of two replacement components is connected with two liquid level meters respectively.The kind of rectifying tower reboiler for dimethyl carbonate production, by liquid level meter real-time monitoring and maintaining reboiler main body in higher than condensate outlet pipe mouth liquid level, form liquid seal and block steam into subsequent process, reduce steam consumption and unit production cost.