66 results about "Reversible reaction" patented technology

The invention discloses preparation of a monatomic graphene type photo-thermal catalyst and application of the monatomic graphene type photo-thermal catalyst in catalyzing aldose to produce ketose, and the preparation comprises the following steps: loading a monatomic precursor (X) on a graphene type carbon material (GT) by adopting a solution impregnation method, further reducing the monatomic precursor into a corresponding monatomic (Y) by adopting a continuous oxidation-reduction method, the monatomic graphene type photo-thermal catalyst is obtained, and the monatomic graphene type photo-thermal catalyst is expressed as Ysg / GT. The catalyst is used for catalyzing other different aldoses (maltose, glyceraldehyde, erythritol and xylose) to produce corresponding ketose, the catalyst shows good catalytic activity and photo-thermal performance, and the ketose yield is larger than 50%. Finally, in the reusability research of the catalyst, the catalyst is found to have good activity and structural stability, the chemical equilibrium limit of the reversible reaction is broken through, the reaction rate is increased, and the catalyst can help to develop an efficient and green catalyst to open up a new way for the reversible reaction process.

The invention provides a crosslinked polyethylene insulating material with intrinsic self-repairing and recoverable characteristics as well as a preparation method and application thereof, and relates to the technical field of cable materials. The crosslinked polyethylene insulating material with intrinsic self-repairing and recoverable characteristics is prepared from the following components in parts by weight: 99.7 parts by weight of low-density polyethylene, 1.0 to 2.6 parts by weight of peroxide, 0.1 to 0.5 part by weight of an antioxidant, 5 to 20 parts by weight of a maleimide monomer, 0.35 to 0.7 part by weight of a catalyst, 0.5 to 3.0 parts by weight of a ligand and 0.5 to 3.0 parts by weight of furyl micromolecules. The low-density polyethylene is subjected to functional modification through catalytic amination reaction, chain interruption and crosslinking in the modification process are avoided, and the mechanical property, the insulating property and the dielectric property of the crosslinked polyethylene are enhanced through peroxide introduced through post-absorption. Meanwhile, the dynamic reversible Diels-Alder reaction introduced by the furyl small molecules is absorbed, so that the polyethylene insulating material has a good intrinsic self-repairing effect on mechanical damage and electric damage.

The application provides a crosslinked polyethylene insulating material with intrinsic self-repairing and recyclable characteristics, a preparation method and application thereof, and relates to the technical field of cable materials.The crosslinked polyethylene insulating material with intrinsic self-repairing and recyclable characteristics is prepared from the following components in parts by weight: 99.7 parts by weight of low-density polyethylene, 1.0-2.6 parts by weight of peroxide, 0.1-0.5 parts by weight of antioxidant, 5-20 parts by weight of maleimide monomer, 0.35-0.7 parts by weight of catalyst, 0.5-3.0 parts by weight of ligand and 0.5-3.0 parts by weight of furan-based small molecule.The low-density polyethylene is functionally modified through catalytic amination reaction, so that the chain breaking and crosslinking in the modification process are avoided, and the mechanical properties, insulating properties and dielectric properties of the crosslinked polyethylene are enhanced through the post-absorption of the introduced peroxide.Meanwhile, the dynamic reversible Diels-Alder reaction introduced by the post-absorption of the furan-based small molecule enables the polyethylene insulating material to have good intrinsic self-repairing effect on mechanical damage and electrical damage.

The invention discloses a preparation method of a self-repairing coating based on a dynamic ester bond, and belongs to the field of self-repairing coating materials, the dynamic ester bond is introduced into epoxy resin, self-repairing is realized through reversible reaction of the dynamic bond, waterborne epoxy resin and a curing agent methylhexahydrophthalic anhydride react, and the self-repairing coating is prepared. Epoxy resin containing dynamic reversible ester bonds can be prepared under the catalytic condition of polyethylene glycol. The prepared dynamic ester bond epoxy resin coating is simple in synthesis process and rapid in reaction; the required raw materials are easy to obtain, the curing time is very short, the self-repairing condition is easy to achieve, and only heating is needed. According to the self-repairing coating material, a common epoxy resin coating has self-repairing performance, the service life of the common coating is prolonged, and resource waste caused by waste, aging and damage of the epoxy resin material is reduced.

The invention discloses polycaprolactone dihydric alcohol containing maleimide groups and a preparation method and application thereof, and the preparation method of the polycaprolactone dihydric alcohol comprises the following steps: adding N-(2, 3-dihydroxy propyl) maleimide, caprolactone and a catalyst into a reaction container, carrying out high-temperature reaction for 12-18 hours, filtering, washing, and drying to obtain the polycaprolactone dihydric alcohol containing the maleimide groups. And cooling and discharging to obtain the polycaprolactone diol containing the maleimide group. The polycaprolactone diol containing the maleimide group is used as a raw material to prepare a polyurethane prepolymer, so that the side chain of the prepolymer is provided with the maleimide group, and then a difuran compound is introduced as a dynamic cross-linking agent to obtain the self-repairing polyurethane elastomer containing the Diels-Alder bond. Through the reversible Diels-Alder (D-A) reaction effect of the functional components, the polyurethane elastomer can be remodeled and recycled, and the polyurethane elastomer has excellent and stable mechanical properties, self-repairing efficiency and repeated self-repairing capability.

The invention provides low-ash low-sulfur vehicle lubricating oil and a preparation method thereof, and belongs to the technical field of lubricating oil. According to the invention, an amphiphilic molecular structure is generated through modified polyisobutylene succinic anhydride and polyamidoamine, a supramolecular ordered film is formed through self-assembly, combustion products and carbon deposition particles are captured, and ash content and sediment generation are reduced, so that the performance requirements of low-ash-content and low-sulfur lubricating oil are met; the reversible reaction of N-(2-aminoethyl) maleimide and 2, 5-bis (aminomethyl) furan is adopted to endow molecular broken bond-recombination self-repairing capability, and micro cracks of a lubricating system are repaired; for the anti-wear agent, UV / O3 is adopted to activate MXene, and multi-step modification of tributyl borate and fluoroalkyl silane is combined, so that the lubricating oil is endowed with low friction coefficient, high thermal stability and excellent dispersing performance, lasting lubrication and effective protection are provided under high-temperature and high-pressure conditions, and lasting lubrication protection under extreme working conditions is realized.

The invention discloses a urease activity detection method based on a non-reversible reaction of dopamine and resorcinol. The urease activity detection method comprises the following steps: mixing a sample to be detected, a buffer solution with the pH value of 7.0 and a urea solution with a certain concentration; adding a certain amount of dopamine and resorcinol into the mixed solution, under the condition of 25-45 DEG C, catalyzing urea hydrolysis by urease, causing the pH value of the surrounding area of the urease to rise so as to form a local alkaline environment, further inducing the reaction of the dopamine and the resorcinol to generate a blue fluorescent substance, and adding excessive hydrochloric acid to terminate the reaction after the reaction is carried out for 40-120 minutes; and detecting the fluorescence intensity of the reaction liquid by using a fluorospectro photometer, and calculating the urease activity in the sample according to a fluorescence intensity-urease concentration standard curve. The urease activity detection method based on the reaction of dopamine and resorcinol has the advantages of high detection speed, high sensitivity, good selectivity and the like.

The invention relates to a plastic material comprising at least one polymer that comprises a plurality of chemical bonds that can be broken by a chemically reversible reaction, the chemical bonds being arranged in the polymer so as to obtain a plurality of oligomers having a molecular weight 5 to 20 times lower than that of the polymer after chemical breakdown of the polymer.

The invention belongs to the technical field of liquid metal corrosion numerical simulation, and particularly relates to a liquid metal corrosion simulation method based on a near-field dynamic reaction diffusion equation. By adopting a near-field dynamics method, the problems of heterogeneity, damage and the like can be naturally simulated; the corrosion process is regarded as a chemical reaction process, the relation between a reaction term and the current density and the overpotential can be directly obtained through formula derivation, the influence of the concentration gradient on the corrosion process is relieved, and the reversible reaction can be simulated; a phase change mechanism of autonomous evolution of the interface is combined, an autonomous moving solid-liquid interface is obtained, a random mechanism of mechanical key formation and fracture is introduced into a phase change model, and random characteristics in the random mechanism are described. According to the method, the influence of some parameters or conditions on the liquid metal corrosion process can be researched while the liquid metal corrosion process can be visually and physically described, and favorable help is provided for research in the field of liquid metal corrosion.

The application belongs to the field of chemical separation and functional materials, and provides an industrial hemp metabolite extraction method based on dynamic borate reversible reaction. The application adopts a core-shell mesoporous functional adsorbent design. The adsorbent comprises a mesoporous silica core and an organic shell layer containing a pincer-type double-boron recognition cavity. The distance from boron to the boron center is 0.32-0.50 nm. The selective adsorption of ortho-diphenol type industrial hemp metabolites is realized under the condition that the volume fraction of ethanol is 85-96 vol%, and the temperature is 30-40 DEG C. The borate bond is reversibly broken by reducing the acidity and / or introducing a glycol competitive agent to complete mild desorption, realizing the performance of a selectivity coefficient of greater than or equal to 100, a recovery rate of greater than or equal to 95%, an activity retention rate of greater than or equal to 90% after 100-200 cycles, and a boron leaching amount of less than or equal to 1 ppm. The triple contradiction between the shell layer cross-linking and recognition cavity accessibility, high liquid hourly space velocity and ethanol-water microenvironment regulation, mild regeneration and site chemical integrity is solved, and the application has wide application value.

The present invention relates to spiropyrans and process for the manufacture of them. In particular, a method is provided to exchange the indole and salicylaldehyde part of a spiropyran in a reversible reaction. The method is used for the synthesis of dual color photoinitiators with specific substituents and substitution patterns, which result in improved dual color volumetric printing (xolography). Furthermore, a process for locally polymerizing a starting material by dual color photopolymerization is disclosed.

This invention discloses a method for preparing a 3D-printed impact-resistant elastic conductor material. Silver particles / silver nanosheets are used as the conductive phase, and polyboron dimethylsiloxane (PBMS) is used as the impact-resistant material. The addition of a polyhydroxyl-based low-boiling-point solvent reversibly adjusts the density of the dynamic B-O crosslinking bonds within PBMS and reversibly increases the number of silanol groups, thereby increasing the hydrogen bond density and enhancing the printability of PBS without affecting its shock-absorbing effect. This invention utilizes the reversible reaction principle between the polyhydroxyl-based low-boiling-point solvent and the dynamic B-O crosslinking bonds to control the decrease and recovery of B-O density. Simultaneously, due to the percolation effect of silver powder particles / silver sheets, the Ag / PBS impact-resistant elastic conductor exhibits excellent conductivity. After vacuum drying of the polyhydroxyl-based low-boiling-point solvent in the printed pattern, the density of the dynamic B-O crosslinking bonds is restored, and the Ag / PBS impact-resistant elastic conductor regains its good shear thickening effect, conductivity, sensing performance, and self-healing properties.

The invention discloses a BOG gas dehydrogenation system and a use method thereof, and belongs to the technical field of gas separation. The BOG gas dehydrogenation system comprises a dehydrogenation device, the dehydrogenation device is connected with a mixed gas source unit and a circulating heat exchange medium unit, and the end, away from the mixed gas source unit, of the dehydrogenation device is connected with a dehydrogenation mixed gas unit. According to the BOG gas dehydrogenation system, the purpose of hydrogen separation is achieved through the reversible reaction of hydrogen storage alloy and hydrogen adsorption, the process is carried out under the conditions of normal temperature and low pressure, and compared with existing methods of low-temperature separation, high-pressure adsorption and the like, energy consumption is greatly reduced, and energy conservation and emission reduction are facilitated; meanwhile, compared with an existing physical method, the hydrogen separation method further has the advantages of being simple in equipment and easy to implement, the equipment investment and the operation cost can be greatly reduced, and large-scale application is facilitated.

The invention relates to a method for preparing manganese dioxide with a large specific surface area by taking hypochlorous acid as a catalyst, which specifically comprises the following steps of: changing electrode potentials of HClO / Cl2 and MnO4- / MnO2 electric pairs by adjusting chlorine partial pressure so as to control the proceeding direction of a reversible reaction # imgabs0 #; and finally, the electrolytic manganese dioxide with low selling price is converted into the chemical manganese dioxide with high price and large specific surface area. Compared with the prior art, the method provided by the invention is green and environment-friendly, basically does not generate any waste pollutants, and basically does not consume any chemical agent (hypochlorous acid only plays a catalyst role in the reaction process) in the production process.

According to the method and system for preparing formic acid by catalyzing hydrolysis of methyl formate through the ionic liquid, in the system and method, the reversible reaction of hydrolysis of methyl formate can be prevented through the basic ionic liquid, hydrolysis of methyl formate into methyl alcohol and formic acid is promoted, and the conversion rate of methyl formate is increased; meanwhile, the re-esterification reaction of the hydrolysis product formic acid and methanol can be inhibited, so that the concentration of formic acid in the hydrolysis product is improved, the energy consumption during formic acid concentration is reduced, and more favorable conditions are provided for subsequent formic acid concentration. In addition, the alkaline ionic liquid can break azeotropy of formic acid and water so as to realize efficient hydrolysis and product separation. In addition, through reasonable backflow and cyclic utilization of materials among the towers, unnecessary multiple rectification separation is avoided, energy consumption is reduced, and production efficiency is improved.

This system provides a silica scale generation prediction system that can predict the amount of silica scale generated with greater accuracy. [Solution] The silica scale generation prediction system according to the present invention is based on the temperature T at the predicted site of the target object. s A prediction formula PF for silica concentration C, which depends on the silica concentration, and the time t until the silica-containing fluid reaches the predicted site. s The system includes a silica scale generation prediction unit that predicts the amount of silica scale generated at a predicted site based on at least one of the silica concentration C prediction curve PC which depends on the silica concentration C, wherein the silica concentration C prediction formula PF and the silica concentration C prediction curve PC are obtained based on a reaction model generated using a silica polymerization reaction that includes reversible and irreversible reactions and precipitation equilibrium reactions of silica contained in the fluid, and the silica scale generation prediction unit calculates the amount of silica scale generated at the predicted site using at least one of the initial silica concentration Ci and the fluid flow rate FR.

The invention provides a method for preparing D, L-menthyl benzoate, and belongs to the field of organic chemical synthesis, a sodium methoxide / magnesium oxide type solid base catalyst is used for replacing strong acid and sodium methoxide catalysts, equipment is not corroded, and the used solid base catalyst is convenient to separate and can be recycled; a safe and low-toxicity solvent is used, and a solvent reflux dropwise adding process is adopted, so that the reversible reaction is continuously carried out towards the direction of synthesizing the menthyl benzoate, and the yield of the menthyl benzoate is higher; compared with the traditional synthetic method of menthyl benzoate, the method has the advantages that the sodium methoxide / magnesium oxide type solid base catalyst is a good catalyst for synthesizing menthyl benzoate, and the reaction is promoted by using one or a mixed solvent of dichloromethane, cyclohexane, n-heptane, cyclooctane and other solvents; the yield of the menthyl benzoate is higher, the experimental synthesis process is simple, and the application value is higher.

The present invention discloses an alternating electromagnetic field catalytic reactor, comprising a reactor outer cylinder, a reactor inner cylinder, a central electrode, a high-voltage electrode lead, and a low-voltage electrode lead; the reactor outer cylinder is provided with a heat source; the upper and lower portions of the reactor inner cylinder are mounted inside the reactor outer cylinder via a first flange; the upper and lower portions of the reactor outer cylinder are further provided with a second flange outside the first flange, forming a first insulating space between the first flange and the second flange; the outer portion of the reactor inner cylinder is sprayed with an insulating coating, and a second insulating space is formed between the reactor outer cylinder; and a magnetic catalyst accommodating space is formed inside the reactor inner cylinder. In the present invention, the electromagnetic field generated by the central electrode and the reactor inner cylinder magnetizes the catalyst, enhancing the magnetic field strength, and polarizes the reactant molecules of the raw reaction gas. Under the influence of a specific frequency, the adsorption of reversible reaction reactants and the desorption of products are accelerated, thereby accelerating the reaction rate.

A layered metal-organic framework (MOF) material and a preparation method and use thereof are provided. The layered MOF material has a chemical formula of [Zr6(μ3-O)4(μ3-OH)4(OH)4(H2O)4(HPCDA)4], where the organic ligand (H3PCDA) is 4,4′-(9-(1H-pyrazol-4-yl)-9H-carbazol-3,6-diyl)dibenzoic acid. The MOF is synthesized as follows: under closed conditions, the organic ligand 4,4′-(9-(1H-pyrazol-4-yl)-9H-carbazol-3,6-diyl)dibenzoic acid and a zirconium salt are allowed to undergo a solvothermal reaction in an organic solvent to produce a crystal of the MOF material. The MOF material can allow the reversible reactive capture of SO2.

The invention belongs to the field of chemical separation and functional materials, and provides an industrial cannabis sativa metabolite extraction method based on a dynamic borate reversible reaction. A core-shell mesoporous functional adsorbent design is adopted, the adsorbent comprises a mesoporous silicon dioxide core and an organic shell layer containing a clamp type double-boron recognition cavity, the distance from boron to the boron center is 0.32-0.50 nm, and selective adsorption of the o-diphenol industrial cannabis metabolite is achieved under the conditions that the ethanol volume fraction is 85-96 vol% and the temperature is 30-40 DEG C; mild desorption is completed by reducing acidity and / or introducing a diol competitor to reversibly break boric acid ester bonds, and the performance that the selectivity coefficient is larger than or equal to 100, the recovery rate is larger than or equal to 95%, the activity retention rate is larger than or equal to 90% after circulation is conducted 100-200 times, and the boron leaching amount is smaller than or equal to 1 ppm is achieved; triple contradictions between shell cross-linking immobilization and recognition cavity accessibility, high liquid hourly space velocity and ethanol-water microenvironment regulation and control and mild regeneration and site chemical integrity are solved, and the method has wide application value.

The invention provides a reprocessed plastic composite sheet and a preparation method thereof, the composite sheet comprises 80-95% of recycled plastic particles, 0.5-5% of a nano aluminum silicate molecular sieve, 0.5-2% of a microsphere encapsulated free radical scavenger and 0.5-2% of a processing aid, a dynamic crosslinking prepolymer forms a self-repairing network during processing based on a Diels-Alder reversible reaction mechanism, and the self-repairing network is used for repairing the reprocessed plastic particles. The viscosity of a melt is reduced through high-temperature decrosslinking, the strength is improved through recombination after cooling, the fatigue resistance of the regenerated plastic is remarkably improved, NIPAM-co-AAc temperature-sensitive microspheres are shrunk through hot pressing triggering, hindered amine / phenol antioxidants are accurately released, and thermal oxidation degradation is inhibited. The preparation process adopts multi-stage mixing and hot-pressing stabilization to realize uniform dispersion of the nano molecular sieve, interface compatibility of fluoride and dynamic cross-linked network recombination, finally obtains the regenerated plastic sheet with a flat surface, breaks through the performance limitation of regenerated plastic, can be widely applied to the fields of packaging, construction and automobiles, and has environmental protection property and economical efficiency.

The application discloses a fluidized reaction process of calcium-based heat storage material. The fluidized reaction process of the calcium-based heat storage material comprises the following steps: S1: under the blowing of airflow, a solid mixture of inert solid particles and the calcium-based heat storage material is allowed to reversibly react in a fluidized bed reactor to obtain material A; the inert solid particles are A-type particles which do not participate in the reversible reaction of the calcium-based heat storage material, the mass percentage of the inert solid particles in the solid mixture is 55-90%, and the airflow comprises fluidized gas which does not participate in the reversible reaction of the calcium-based heat storage material; S2: the material A is fed into a cyclone separator, the inert solid particles in the material A are separated and fed back into the fluidized bed reactor. The application greatly improves the fluidization effect of calcium-based heat storage material Ca(OH)2 / CaO powder, improves the conversion rate and cycle performance of the calcium-based heat storage material, improves the exothermic reaction temperature, and the heat production quality is higher.

The invention discloses a modified aramid fiber and a preparation method thereof, and the modified aramid fiber is characterized in that a bifunctional molecular layer is grafted on the surface of the aramid fiber through chemical bonds. The molecular layer is provided by an organosilane bifunctional coupling agent with a structural general formula of X-L-Y, X is a group (such as chlorosilane, alkoxy silane and the like) capable of forming a stable first covalent bond with the fiber surface, Y is a group (such as furyl, maleimide and the like) capable of forming a dynamic covalent bond interface with a resin matrix, and L is a connecting chain. The preparation method comprises the following steps: carrying out surface activation treatment on the aramid fiber, and then carrying out grafting reaction on the aramid fiber and a difunctional coupling agent under the action of a catalyst. According to the method, a molecular layer with stable anchoring and dynamic reversible reaction characteristics is introduced to the surface of the fiber, so that the obtained composite material obtains high interfacial shear strength (ILSS), the mode I interlayer fracture toughness (GIC) is remarkably improved, and the technical problem that the interfacial strength and toughness are difficult to synergistically improve in a traditional modification method is effectively solved.

The present invention discloses a pressure-type high-temperature thermochemical heat storage tank system and a working method thereof, which is suitable for gas (steam)-solid reversible reaction systems such as Ca(OH)2 / CaO+H2O. The system comprises a reaction tank, a pressure-surge tank, a water storage tank, a booster pump, a vacuum pump, a cooler, a reaction steam pipeline, a vacuum pipeline, a steam generation pipeline, a cooling spray pipeline, a drain pipeline and valves corresponding to each pipeline. The pressure-type reaction tank is used to increase the equilibrium temperature of the reversible chemical reaction to increase the heat storage temperature, the pressure of the reaction tank is stabilized by evaporation or condensation of water and water vapor in the pressure-surge tank, the liquid water required by the system is stored in the water storage tank, and the water level of the pressure-surge tank is balanced by draining or pressurized pumping, so as to realize the storage and release of high-temperature thermal energy, and the heat storage and release process is completely decoupled. The system does not need to transport the reaction materials, and can realize long-term thermal energy storage. The system is simple and can be used for large-scale thermal energy storage.

The invention discloses a reversible reaction-based perovskite composite tanning agent as well as a preparation method and application thereof, and belongs to the technical field of leather tanning agents. According to the method disclosed by the invention, zirconium halide perovskite with high stability is adopted as a raw material, the stability of the perovskite can be synergistically improved by adding halogen metal salt, zirconium ions provide tanning performance for the material, and meanwhile, when the zirconium halide perovskite is compounded with other zirconium tanning agents for tanning, the concentration of the zirconium ions in tanning bath liquid is improved by introducing the zirconium tanning agents; on the basis of the reversible reaction principle, hydrolysis of the zirconium halide perovskite can be slowed down, the nano structure of the zirconium halide perovskite is further maintained, uniform permeation of zirconium is facilitated, the comprehensive tanning performance of the zirconium tanning agent is improved, and particularly the damp and heat resistance stability and filling performance of tanned crust leather are improved.

The invention belongs to the technical field of chemical engineering, and particularly relates to ethylene glycol antimony and a preparation method and application thereof.The preparation method comprises the steps that firstly, antimonous oxide and ethylene glycol with the mass ratio being 1: (8-10) are added into a preheating reaction kettle, steam heating is conducted for 1-1.5 h at the temperature of 130 DEG C, pulping is conducted, then slurry is conveyed to a main reaction kettle, a vacuumizing electric heating reaction is conducted, and a reaction product is obtained; the electric heating temperature is 450-460 DEG C, and the reaction time is 5-6 hours, filtering until the solution is transparent, conveying to a crystallization kettle, crystallizing, centrifuging, washing and drying to obtain ethylene glycol antimony; the problem that in the prior art, due to the fact that antimony trioxide and ethylene glycol are subjected to reversible reaction, the dissolution transmittance of ethylene glycol antimony is low due to the fact that the temperature is too high or too low is solved, and the problem that in the prior art, due to the fact that antimony trioxide and ethylene glycol are subjected to reversible reaction, the dissolution transmittance of ethylene glycol antimony needs to be guaranteed due to excessive raw materials is solved.

The invention relates to a continuous production method and system of terephthalic acid diester. The method comprises the following steps: introducing terephthalic acid and alcohols into a first tubular reactor for primary esterification reaction, and condensing to obtain a reaction mixture; carrying out reverse osmosis treatment on the reaction mixture through a membrane module to respectively obtain a concentrated solution and a penetrating fluid containing water and alcohols; carrying out pervaporation separation treatment on the penetrating fluid to respectively obtain alcohols and water; and introducing the obtained alcohol and the concentrated solution into a second tubular reactor for secondary esterification reaction to obtain the terephthalic acid diester. According to the method, the tubular reactor is combined with the reverse osmosis membrane and the vaporizing osmosis membrane, so that the mass and heat transfer effects are enhanced, the use of a catalyst is avoided, the reaction time is shortened, and the generation of byproducts is reduced; meanwhile, by separating water and breaking reversible reaction balance, the reaction can be continuously and positively carried out, the yield of the target product terephthalic acid diester is increased, the technological process is simple, and the method is suitable for industrial production.

The present invention provides a composite material of zinc surface modified double hydroxide and a preparation method and application thereof. The composite material comprises a base layer and a modification layer. The base layer comprises zinc metal and / or zinc alloy. The structural formula of the modification layer is: Zn a M x (SO4) y (OH) z ·wH2O; M is at least one of Fe, Mn, Cu, Co, Mg and Ni; the present invention introduces a high entropy reversible reaction by modifying a double hydroxide material with a hydrotalcite-like structure on the surface of zinc. The composite material is used as an electrode to enable an electrochemical energy storage device to have a larger temperature coefficient α, thereby improving the P value and EE of the electrochemical energy storage device and improving the cycle stability of the electrochemical energy storage device; the present invention also provides a method for improving the energy efficiency of the electrochemical energy storage device, which effectively saves the charging energy of the electrochemical energy storage device by charging the battery at high temperature and discharging the battery at low temperature, thereby improving the energy efficiency of the electrochemical energy storage device.

The application discloses a poly-caprolactone diol containing a maleimide group and a preparation method and application thereof, and the preparation method of the poly-caprolactone diol is as follows: N-(2,3-dihydroxypropyl) maleimide, caprolactone and a catalyst are added into a reaction container, and after high-temperature reaction for 12-18 hours, the poly-caprolactone diol containing the maleimide group is obtained by discharging after temperature reduction. The poly-caprolactone diol containing the maleimide group is used as a raw material to prepare a polyurethane prepolymer, so that the side chain of the prepolymer has the maleimide group, then a double-furan compound is introduced as a dynamic crosslinking agent to obtain a self-repairing polyurethane elastomer containing a Diels-Alder bond. The polyurethane elastomer can be remolded and recycled through the reversible Diels-Alder (D-A) reaction of the functional components, and has excellent and stable mechanical properties, self-repairing efficiency and repeated self-repairing capacity.

The invention belongs to the field of material synthesis, and particularly relates to a vegetable-sponge-shaped covalent organic framework material as well as a preparation method and application thereof. I) uniformly dispersing a monomer C3 containing an aldehyde group functional group and a triazine structure, a monomer C2 containing an amino group and a sulfydryl group, a catalyst and a regulating agent in an organic solvent to obtain a dispersion liquid; and ii) carrying out a reversible reaction on the dispersion liquid at 20-50 DEG C for 1-5 days, so that the construction units of the two monomers are connected together to obtain a corresponding product, and washing and drying the product to obtain the vegetable sponge-shaped covalent organic framework material. According to the preparation method disclosed by the invention, the covalent organic framework material can be synthesized at room temperature, the reaction condition is mild, the preparation is convenient, the harsh condition of high-temperature synthesis is avoided, meanwhile, the microstructure can be controlled, and the covalent organic framework material with a vegetable sponge-shaped structure is prepared.