503 results about "Alkaline catalyst" patented technology

The invention provides a functional graded porous carbon microsphere and a preparation method and application thereof, the preparation method comprises the following steps: S1, mixing a soft template, a phenolic compound, a cross-linking agent and a basic catalyst, and reacting to obtain a thermosetting phenolic resin microsphere; s2, carrying out pre-carbonization treatment on the thermosetting phenolic resin microspheres to obtain a carbonized material; s3, performing physical activation on the carbonized material to obtain graded porous carbon microspheres; s4, performing heat treatment on the graded porous carbon microspheres to obtain functionalized graded porous carbon microspheres; the preparation method has the characteristics of simple process, environmental protection and economical efficiency, the functionalized porous carbon microspheres prepared by the method are uniform in morphology, and the pore volume, pore diameter and pore structure of the functionalized graded porous carbon microspheres can be accurately regulated and controlled, so that the functionalized graded porous carbon microspheres meeting application requirements are obtained.

The invention discloses an organic wastewater adsorbent as well as a preparation method and application thereof, and belongs to the technical field of sewage treatment. Comprising the following steps: carrying out nitration reaction on styrene porous microsphere resin, and then carrying out reduction reaction to obtain amino-modified porous microsphere resin; the preparation method comprises the following steps: carrying out polymerization reaction on high-nitrogen-content amino organic small molecules and aldehyde group small molecules under the action of a basic catalyst in an adsorption polymerization manner to generate a nitrogen-doped organic porous polymer, and coating the surface of amino-modified porous microsphere resin with the nitrogen-doped organic porous polymer to obtain the organic wastewater adsorbent. The porous microsphere resin adsorbent with large adsorption capacity and high organic matter removal rate is synthesized by using the carrier advantage of styrene microsphere resin and introducing a porous heteroatom polymer on the microsphere resin. When the adsorbent is used, the adsorbent is directly added into an organic wastewater solution, and the removal rate of bisphenol A, aniline and tetracycline can reach 90% or above.

The invention belongs to the field of soft magnetic functional materials, and particularly relates to a low-loss high-superposition Fe-Si-Al magnetic powder core and a preparation method thereof, and the preparation method comprises the following steps: preparing a coating agent, passivating coated powder, bonding and lubricating, and pressing and annealing. According to the method, based on the hydrolysis characteristic of metasilicic acid and the hydrolysis promotion effect of the alkaline catalyst, nano-porous silicon dioxide is prepared as a coating agent, meanwhile, the etching effect of alkaline matter on silicon dioxide can effectively increase the specific surface area of the nano-porous silicon dioxide, and the bonding strength of the nano-porous silicon dioxide and iron-silicon-aluminum powder is improved; the vacuum calcination treatment not only removes residual reagents, but also promotes sufficient thermal decomposition of metasilicic acid into silicon dioxide for in-situ coating, and stabilizes the lattice structure of the metasilicic acid. The coating layer of the low-loss high-superposition Fe-Si-Al magnetic powder core is firm in combination, thin and uniform in thickness and stable and compact in structure, the hysteresis loss of the Fe-Si-Al magnetic powder core can be effectively reduced, the direct-current bias performance is improved, and rising of eddy-current loss is avoided.

The invention discloses coal tar mixed phenol novolac epoxy resin as well as a preparation method and application thereof. The preparation method of the coal tar mixed phenol novolac epoxy resin comprises the following steps: S1, in an inert atmosphere, mixing and stirring refined coal tar mixed phenol, a solvent and an acid catalyst, then adding an aldehyde solution, and reacting to obtain phenolic resin; s2, in an inert atmosphere, mixing and stirring phenolic resin, a phase transfer catalyst and epoxy chloropropane, preheating to 70-100 DEG C, reacting for 1-4 hours, cooling to 65-70 DEG C, dropwise adding a basic catalyst, heating to 80-85 DEG C, continuously reacting for 2-3 hours, and naturally cooling; and carrying out post-treatment. According to the preparation method and application of the coal tar mixed phenol novolac epoxy resin, operation is easy and convenient, control is easy, and batch production can be achieved conveniently; in addition, the refined coal tar mixed phenol is low in price, the production cost of the anticorrosive paint is greatly reduced, the performance of the paint is improved, and the economic benefits of enterprises are improved.

The invention discloses a heteroatom modified intrinsic microporous polymer material, a preparation method and application, and belongs to the technical field of environmental governance, and the preparation method comprises the following steps: (1) preparing nitro-substituted oxygen atom bridged calixarene from cyanuric chloride and nitro-substituted resorcinol in the presence of a basic catalyst; (2) reducing the nitro-substituted oxygen atom bridged calixarene into amino-substituted oxygen atom bridged calixarene; and (3) carrying out a Schiff base polymerization reaction on the amino-substituted oxygen atom bridged calixarene and a polyfunctional aldehyde group under a solvothermal condition to obtain the heteroatom modified intrinsic microporous polymer material. When the adsorbent is used, the adsorbent is directly added into a metal ion solution, the removal rate of dichromate radicals and manganese ions can reach 90% or above, and the adsorbed material can be repeatedly used after being washed by an acidic aqueous solution. And the polymerized material also has high water body stability, and is beneficial to recycling of the material.

The invention discloses a dispergator of a polyurethane structural adhesive as well as a preparation method and application of the dispergator. The dispergator comprises a polar organic solvent, an alcohol additive, a basic catalyst, an ionic liquid and a surfactant. The dispergator is suitable for removing a bonding interface of a thermosetting polyurethane structural adhesive in a power battery module, the dispergation process is mild and safe, and swelling, fracture and interface release of the structural adhesive can be realized in a range from normal temperature to 55 DEG C. Compared with a traditional high-corrosion and high-energy-consumption dispergation means, the dispergation agent has the advantages of being high in degumming efficiency, little in residual gum, free of base material corrosion and the like, is suitable for the environment-friendly recycling and reusing scene of the retired lithium battery, and has good engineering practicability and popularization value.

The invention relates to the technical field of petrochemical proppants, and discloses a high-performance phenolic resin material which comprises the following components in percentage by weight: 60%-75% of modified phenolic resin, 5%-15% of a curing accelerator, 10%-20% of a flexibilizer, 5%-20% of a filler and 3%-10% of a multifunctional additive, the modified phenolic resin is prepared by the following steps: mixing a phenolic compound and a formaldehyde solution in a reaction kettle, adding a basic catalyst, and reacting to obtain a phenolic prepolymer; gradually adding a modifier containing a hydroxyl group, an epoxy group and a carboxyl group into the phenolic prepolymer, and simultaneously stirring to obtain a mixture; heating the obtained mixture for reaction to complete crosslinking modification reaction to obtain modified phenolic resin; and cooling the modified phenolic resin to room temperature for later use. By adopting the design of the multifunctional flexibilizer and the composite filler, the toughness and thermal conductivity of the material are improved, meanwhile, the curing efficiency is accelerated through the curing accelerator, and the industrial cost is reduced.

The invention relates to the technical field of phenolic resin preparation, in particular to high-temperature-resistant silicon-boron dual-modified phenolic resin and a preparation method thereof.The preparation method comprises the steps that firstly, specific silane, phenylboronic acid, a specific catalyst and ethyl alcohol are added into a reactor, after the reaction is completed, reduced pressure distillation is conducted to remove ethyl alcohol, and a boron-silicon modifier is obtained; 2, mixing a phenolic compound with a dehydrating agent, stirring, heating, sequentially adding a borosilicate modifier and a basic catalyst, adjusting the pH value, and carrying out a dehydration esterification reaction under a reduced pressure condition; 3, after the esterification reaction is finished, an aldehyde compound is added, stirring and heating are conducted, decompression dehydration and addition polycondensation reaction are conducted at the same time, and finally the boron-silicon modified phenolic resin is prepared. In the scheme, high-bond-energy boron-oxygen bonds and silicon-oxygen bonds are introduced into the phenolic resin, part of phenolic hydroxyl groups are blocked, the number of phenolic resin benzene rings is increased, and therefore the phenolic resin is prepared; the synthesized borosilicate phenolic resin has high residual carbon content and excellent high temperature resistance, ablation resistance and oxidation resistance, and has a wide application prospect.

The invention relates to the technical field of heat energy storage materials, and particularly provides a silicon dioxide aerogel composite phase change heat storage material and a preparation method thereof. The method comprises the following steps: mixing an organic silicon source, absolute ethyl alcohol and deionized water according to a specific ratio, fully stirring to obtain a mixed solution, and dropwise adding an acid catalyst into the mixed solution at room temperature for hydrolysis reaction to obtain a hydrolysate; sequentially adding a drying control agent and an alkali catalyst, and standing for gelation reaction to obtain gel; adding an organic solvent to carry out aging reaction, and then adopting the organic solvent to carry out replacement for multiple times to obtain alcogel; replacing the alcohol gel with an organic solvent for multiple times to obtain wet gel, soaking the wet gel in an excessive molten phase change material, and carrying out normal-pressure solvent replacement and drying at 40 DEG C to obtain the phase change material, the loading capacity of octadecane in the obtained CPCM is about 83%, the phase change enthalpy reaches up to 192J / g, the heat conductivity is as low as 0.0812 W / m.K, and no obvious leakage occurs after 200 times of circulation.

The invention discloses a method for synthesizing 2-vinylpyridine by a one-pot method, which comprises the following step: by taking 2-methylpyridine and paraformaldehyde as raw materials and water as a solvent, synthesizing the 2-vinylpyridine by a one-pot reaction under the catalysis of a basic catalyst. According to the invention, 2-methylpyridine and paraformaldehyde are taken as initial raw materials, the raw materials are simple and easy to obtain, the production cost is reduced, and water is taken as a solvent, so that the use of a large amount of organic solvents is avoided, and the influence on environmental pollution is small. In the reaction, a basic catalyst such as triethylamine is used as a catalyst, a small amount of sodium hydroxide solid is added in the reaction process, the basic catalyst enables the whole system to be in an alkaline environment, and sodium hydroxide improves the depolymerization efficiency of paraformaldehyde and promotes the dehydration process of the reaction, so that the selectivity and yield of 2-vinylpyridine are improved.

The invention discloses a preparation method of high-temperature-resistant hydrophobic aerogel. The preparation method comprises the following preparation steps: (1) adding acid into a mixed solution of organic estersil or organic silicon and alcohol, controlling the pH value to 2-5.5, then adding silica sol, and stirring to obtain hydrolysate A; wherein the silica sol is a mixture of first silica sol with the D50 particle size of 8-20 nm and second silica sol with the D50 particle size of 50-100 nm; (2) adding a basic catalyst into the hydrolysate to obtain a sol substance B; (3) adding an opacifying agent and a flame retardant into the sol substance B to obtain a sol substance C; and (4) carrying out gelation, aging, hydrophobic modification and drying on the sol C to prepare the aerogel. The aerogel provided by the invention has excellent hydrophobic performance and extremely low water absorption rate at high temperature.

The invention provides a preparation method of dicapryl carbonate, belongs to the field of preparation of dicapryl carbonate, and can solve the problems of unstable reaction system, low raw material conversion rate, low catalyst efficiency, poor phase contact effect, many side reactions, low product purity and poor quality in the existing preparation method of dicapryl carbonate. The preparation method of dicapryl carbonate comprises the following steps: fully mixing n-caprylic alcohol, a basic catalyst and a cosolvent, continuously dropwise adding low-grade dialkyl carbonate into the mixed solution for 5-10 hours through a liquid material distributor, carrying out ester exchange reaction, continuously extracting low-boiling-point substances, controlling the reflux quantity, and carrying out reduced pressure distillation to obtain the dicapryl carbonate. The method comprises the following steps: adding a cosolvent into a reaction solution, enabling the cosolvent with an initial addition amount to always exist in the reaction solution, after the reaction is finished, dealcoholizing by reduced pressure distillation, and removing impurities by washing to obtain a crude product of dioctyl carbonate, and rectifying to obtain a dioctyl carbonate product. The preparation method is high in raw material conversion rate and high in product yield, and the purity of the obtained product is gt; the content of impurities is low, and the method can be applied to preparation of cosmetics.

The invention discloses a preparation method of an aerogel laminated composite heat insulation pad, and relates to the technical field of aerogel heat insulation pads, and the preparation method comprises the following steps: mixing and dispersing a silane precursor and absolute ethyl alcohol, adding a basic catalyst, hydrolyzing to generate sol, and aging to form prefabricated sol; adding a flame retardant, a smoke retardant and reinforced fibers, dispersing and gelatinizing, and carrying out supercritical drying to obtain an aerogel block; and coating basalt fiber non-woven fabric with the aerogel slurry to form a base layer, laminating a plurality of layers, and carrying out hot-pressing curing, cooling, post-curing, cutting and edge covering to obtain the composite heat insulation pad. According to the invention, by optimizing the ratio of silane and a drying process, the pore structure and the thermal stability of the aerogel are obviously improved; the flame-retardant, mechanical and heat-insulating properties are improved through multi-component collaborative design, and the obtained heat-insulating pad has the characteristics of low heat conductivity, high strength, excellent flame retardance and light weight, and is suitable for multiple heat-insulating and flame-retardant fields.

The invention discloses a preparation method of photo-thermal anti-icing / deicing slurry, the photo-thermal anti-icing / deicing slurry and application. The preparation method comprises the following steps: in the presence of a basic catalyst, mixing an aqueous dispersion of nanocellulose with a polymer-based photo-thermal material monomer for reaction to obtain a first mixed solution; and mixing the first mixed solution with a water repellent agent solution, carrying out a grafting reaction, and carrying out centrifugal washing to obtain the photo-thermal anti-icing / deicing slurry. After the slurry prepared by the method is used for forming a coating, the problem that an anti-freezing surface is difficult to maintain an anti-freezing state in a long-time use state or a low-temperature and high-humidity environment can be well solved, and in addition, the coating can realize anti-icing and deicing, water and water proofing, thermal management, ultraviolet radiation prevention, photo-thermal sterilization, oil-water separation and the like of a solid surface.

The invention discloses a defoaming agent containing nano MOF and a preparation method and application thereof, and the defoaming agent is prepared from the following components in parts by weight: 1-5 parts of nano MOF, 10-20 parts of hyperbranched polyethyl siloxane, 10-30 parts of fluoropolyether, 1-5 parts of modified hydrophobic white carbon black, 1-5 parts of a base catalyst, 2-10 parts of an emulsifier and 1-3 parts of a stabilizer. The nano MOF in the defoaming agent is compounded with defoaming agents such as hyperbranched polyethyl siloxane and fluoropolyether, so that the high temperature resistance and chemical stability of the defoaming agent are improved. The nano MOF and the nano modified hydrophobic white carbon black are hybridized, and the hydrophobic nano MOF and the modified hydrophobic white carbon black are embedded into a hyperbranched skeleton, so that the mechanical puncture capacity of the particles is improved. The nano MOF can gradually release defoaming active components in the system, the defoaming duration is prolonged, and the foam inhibition performance of the defoaming agent in 3D printing is improved.

The invention relates to the technical field of lithium / sodium ion batteries, in particular to a preparation method of a highly graphitized coated carbon material based on phenolic resin, which comprises the following steps: uniformly mixing formaldehyde, resorcinol and a basic catalyst, and then catalyzing and curing; carrying out carbonization treatment on the uncarbonized phenolic resin based on a gradient heating method; mixing ethidene diamine, dichloromethane and carbonized phenolic resin, and heating in an oil bath; and placing the cured and coated graphitized phenolic resin in a tubular furnace for highly graphitizing. According to the preparation method of the highly-graphitized coated carbon material based on the phenolic resin, high ordering of a carbon layer is achieved through gradient heating graphitization, a carbon six-membered ring plane is promoted to expand, an ABAB stacked graphite structure is formed, the conductivity is effectively improved, a CVD coating and nitrogen doping synergistic technology is combined, a CVD reaction is formed through ethanediamine and dichloromethane, and the high-graphitization coated carbon material based on the phenolic resin is obtained. Functional groups such as pyridine-N and graphite-N are introduced to the surface of the carbon layer, so that the interface bonding force between the carbon layer and the matrix is enhanced, and the conductivity of the carbon layer is further improved.

The present invention discloses high temperature resistant silicon aluminum aerogel composite materials with red mud as raw material, preparation method and applications thereof, relates to a field of safe disposal and resource utilization of red mud. The method comprises step of pretreating the red mud; step of mixing and heating pretreated red mud with dilute acid solution for reaction; step of mixing with ethanol aqueous solution, heating and stirring, exchanging anionic resins, and adding alkaline catalyst for solution catalytic reaction; step of adding a modifier dropwise, heating and stirring, and then adding a chelating agent dropwise for ring opening reaction; Finally, compositing with a fiber substrate, through steps of gelling, aging and drying. The method greatly save preparation cost of aerogels, and also solve problem that current red mud waste cannot be effectively utilized and environmental pollution, and realize comprehensive utilization of the red mud and preparation of low-cost aerogel.

The invention relates to a method for preparing bio-based isosorbide dimethyl ether through resin catalysis, and belongs to the technical field of organic synthesis. Adding corn starch into a sulfuric acid solution, hydrolyzing into glucose, and filtering to obtain a glucose solution; adding a solid acid catalyst into the concentrated glucose solution, and filtering after reaction; carrying out reduced pressure distillation on the filtrate to obtain an isosorbide crude product, and purifying through recrystallization; the preparation method comprises the following steps: adding isosorbide, a methylation reagent and a basic catalyst into a reaction kettle, stirring for reaction, cooling and filtering; and distilling the filtrate, and collecting fractions to obtain high-purity isosorbide dimethyl ether. The solid acid catalyst is sorbic acid based styryl macroporous cation exchange resin; the styryl macroporous cation exchange resin is soaked in sulfuric acid to be activated and then is mixed with sorbic acid chloride, 2-thiophenecarbonyl chloride and zinc chloride to react, and then washing and drying are performed to prepare the solid acid catalyst; the isosorbide dimethyl ether prepared by the method disclosed by the invention is high in purity and relatively high in yield.

The invention provides an ultrathin swelling-resistant GO cross-linked membrane as well as a preparation method and application thereof, and belongs to the technical field of nanofiltration separation membrane technology separation. The composite membrane comprises a cross-linked GO separation layer and a supporting layer, a m-xylylenediamine MXDA cross-linked GO layer is used as the separation layer, and a hydrolyzed polyacrylonitrile hPAN polymer membrane is used as the supporting layer; wherein the GO layer and the hPAN polymer film are covalently bonded through MXDA to form a cross-linked network. The preparation method comprises the following steps: firstly, respectively preparing graphene oxide GO; secondly, hydrolyzing a polyacrylonitrile (hPAN) matrix membrane; and finally, constructing a dual cross-linked network system through heat treatment, so that covalent cross-linked bonds are formed between GO nanosheet layers and between GO-hPAN base membranes, and the GO cross-linked membrane is prepared. The density of carboxylic acid groups on the surface of the hPAN membrane can be dynamically optimized by regulating and controlling the type of the basic catalyst, the concentration of the solution, the hydrolysis temperature and the hydrolysis time, a high-efficiency mass transfer channel is created for the composite membrane through a two-dimensional covalent cross-linked structure, and the composite membrane is endowed with excellent dye selective separation performance and anti-swelling stability.

The invention discloses a phosphorus-nitrogen synergistic flame-retardant phenolic aldehyde curing agent as shown in a formula (I) and a preparation method thereof, and the preparation method of the compound comprises the following steps: under the condition of nitrogen, by taking water as a solvent, adding a basic catalyst, uniformly stirring, adding melamine and an aldehyde compound to carry out hydroxylation reaction, then adding a phosphorus-containing monomer to carry out dehydration condensation reaction, and obtaining the phosphorus-nitrogen synergistic flame-retardant phenolic aldehyde curing agent. And neutralizing the reacted material, adding a phenolic compound, heating for reaction, and then carrying out post-treatment to obtain the product. Furthermore, the resin composition for the copper-clad plate is formed by mixing the multifunctional epoxy resin, the phosphorus-nitrogen synergistic flame-retardant phenolic curing agent, the benzoxazine resin, the active ester curing agent, the accelerant, the filler and the solvent, and the prepared phosphorus-nitrogen synergistic flame-retardant copper-clad plate has excellent moisture absorption performance, dielectric property, heat resistance, flame retardance, toughness and the like; the method is suitable for the field of high-performance printed circuit boards. # imgabs0 #

The invention belongs to the field of synthesis of 4, 6-dihydroxypyrimidine, and discloses a preparation method of 4, 6-dihydroxypyrimidine, which comprises the following steps: S1, adding malonamide, a basic catalyst and an organic solvent into a reaction bottle, and fully stirring to obtain a mixed solution; s2, under the stirring condition, carboxylic ester derivatives are dropwise added into the mixed solution; s3, after the carboxylic ester derivative is dropwise added, carrying out a heat preservation reaction; and S4, carrying out post-treatment on the reaction liquid obtained by the heat preservation reaction to obtain the target product 4, 6-dihydroxypyrimidine. The post-treatment comprises acidification, filtration, washing and drying. The preparation method of 4, 6-dihydroxypyrimidine has the advantages of mild reaction conditions, simple and safe operation, cheap and easily available raw materials, high yield, good product purity and environmental friendliness, and has important practical significance and application value.

The invention belongs to the technical field of nano material synthesis, and particularly relates to a method for regulating and controlling the particle size and the pore diameter of mesoporous silica particles with dendritic pore structures. The preparation method comprises the following steps: preparing dendritic mesoporous silica by adopting a two-phase layering method, adding a surfactant and a basic catalyst as a water phase, adding cyclohexane and TEOS as an oil phase, carrying out a self-assembly reaction on a two-phase interface, removing the surface activity in a pore channel by adopting a solvent extraction method, and regulating and controlling the volume ratio of the system oil to the water phase and the volume ratio of the TEOS in the oil, so as to obtain the high-purity mesoporous silica. Dendritic mesoporous silica with specific particle sizes and different pore sizes or with specific pore sizes and different particle sizes is prepared, the particle size of the prepared mesoporous silica is 50-300 nm, and the pore size is 2-15 nm. The method is simple to operate, the prepared mesoporous silica is uniform in particle size, good in dispersity and high in stability, and a new thought is provided for preparation of spherical dendritic mesoporous silica with adjustable particle size and pore size.

The invention relates to a method for synthesizing 3-mercaptopropionic acid by catalyzing acrylic acid and hydrogen sulfide through an acidic molecular sieve, and belongs to the technical field of organic synthesis. In order to solve the problems of low selectivity and difficulty in regeneration of 3-mercaptopropionic acid prepared from an existing basic catalyst, the method comprises the following steps: firstly, pretreating a molecular sieve catalyst to obtain a required acidic molecular sieve catalyst; and mixing the acidic molecular sieve catalyst, acrylic acid and an organic solvent according to a certain mass volume ratio, introducing hydrogen sulfide to a certain pressure, heating to a reaction temperature, and reacting for a certain time to obtain 3-mercaptopropionic acid. The acidic molecular sieve used in the invention has the characteristics of high catalytic activity, high selectivity, high mechanical strength and reproducibility, and can catalyze the addition of acrylic acid and hydrogen sulfide to synthesize 3-mercaptopropionic acid in one step, the conversion rate of 3-mercaptopropionic acid is higher than 90%, the selectivity is higher than 85%, and the method has the characteristics of simple catalytic synthesis method, mild conditions and the like.

The invention provides a preparation method of nitrogen-doped novolac epoxy resin-based hard carbon, which comprises the following steps: polymerizing a phenol monomer and an aldehyde monomer in the presence of a basic catalyst, uniformly mixing with glycidyl amine epoxy resin, curing, crushing and carbonizing to obtain a nitrogen-doped hard carbon material. Due to effective nitrogen doping, the sodium ion battery assembled by using the hard carbon material has the characteristics of high reversible specific capacity and high rate performance; the glycidyl amine epoxy resin is high in epoxy group content, can be cured without adding a curing agent after being mixed with the phenolic resin, and can anchor free phenol in the phenolic resin, so that the carbon yield is increased. The preparation method of the nitrogen-doped novolac epoxy resin-based hard carbon provided by the invention has the advantages of simple process, high carbonization yield and low cost.

The invention provides a preparation method of ultra-low thermal conductivity silicon-based aerogel, and relates to the field of aerogel material preparation, and the preparation method comprises the following steps: S1, preparing a component A and a component B. The component A is prepared by fully mixing a silicon source, a modified silicon dioxide seed crystal, absolute ethyl alcohol and deionized water, then slowly adding an acid catalyst, and carrying out hydrolysis; the component B is a basic catalyst solution obtained by uniformly mixing deionized water and stronger ammonia water; step S2, gelling: fully mixing the component A and the component B to obtain wet gel, and then mixing the wet gel with a fiber felt to obtain a wet gel felt; step S3, aging; and S4, performing supercritical drying. According to the method, by introducing the modified silicon dioxide seed crystal, the thermal conductivity of a solid structure of the aerogel is effectively reduced, meanwhile, formation of macropores, communicating pores and the like is inhibited, and the performance of the aerogel is improved.

The invention provides a method and a system for preparing an epoxy dioxide compound. The method comprises the following steps: enabling dialkene and cumyl hydroperoxide to be subjected to an oxidation reaction to obtain a mixture flow, enabling the mixture flow to be in contact with a basic catalyst, enabling the cumyl hydroperoxide to be subjected to a decomposition reaction to generate acetophenone and methanol, and then performing post-treatment separation to obtain the epoxy dioxide compound. According to the method, cumyl hydroperoxide is decomposed under the high-temperature alkaline condition, the product is methanol / acetophenone, the risk that epoxide dioxide is subjected to ring-opening hydrolysis to become a by-product is avoided, and the yield of subsequent products is ensured.

This invention relates to a trifluoromethyl-substituted pyrene-phenylacetonitrile derivative, its preparation method, and its application. A trifluoromethyl-substituted pyrene-phenylacetonitrile derivative has the structural formula: [formula omitted]. The preparation method involves dissolving 1-pyrene formaldehyde, the corresponding trifluoromethylphenylacetonitrile, and an alkaline catalyst in an organic solvent, and carrying out a Knoevenagel condensation reaction under heating conditions. The reaction product is then post-treated to obtain the pyrene-phenylacetonitrile derivative. The application of a trifluoromethyl-substituted pyrene-phenylacetonitrile derivative in electrical storage devices is also discussed. This invention achieves precise control of storage performance by introducing trifluoromethyl groups at different positions on the benzene ring of the pyrene-phenylacetonitrile backbone, providing a novel design approach for developing new multi-level electrical storage materials. The synthesis route is concise and has broad application prospects in the field of high-density non-volatile memory.

The present application relates to the low temperature curing high-strength benzoxazine type silicone adhesive formula and use method, the formula includes the benzoxazine group containing organic silicon compound and organic alkali compound, the mass ratio of benzoxazine group containing organic silicon compound, organic alkali compound is 100:0.1-20.The adhesive of the present application is based on the cooperation between the benzoxazine group containing organic silicon compound and the basic catalyst, can be cured at low temperature, realize the higher strength bonding.The benzoxazine type silicone adhesive formula provided by the present application can be directly used as adhesive, and the bonding strength is high;It can also be used as a basic formula, used as an adhesive after adding other fillers, to meet the different needs of various special occasions.

The invention discloses a synthesis method of piperonone, and relates to the technical field of flavors, fragrances and chemical engineering, and the synthesis method comprises the following steps: taking acrylate as a raw material, and carrying out Michael addition reaction with isobutene under the action of Lewis acid to obtain 5-methyl-5-hexenoic acid ethyl ester; the preparation method comprises the following steps: carrying out nucleophilic substitution reaction on ethyl 5-methyl-5-hexenoate and bromoisopropane under the action of a basic catalyst to obtain ethyl 5-methyl-2-isopropyl-5-hexenoate; carrying out self Friedel-Crafts acylation reaction on the 5-methyl-2-isopropyl-5-hexenoic acid ethyl ester under the action of Lewis acid, so as to obtain 5-methyl-2-isopropyl-5-chloro cyclohexanone; and carrying out elimination reaction on the 5-methyl-2-isopropyl-5-chlorocyclohexanone under the action of alkali to obtain the product piperonone. According to the synthetic route, conventional chemical reagents are used as raw materials, reaction conditions are mild, emission of three wastes is reduced to a great extent, and the synthetic route is more environmentally friendly and suitable for continuous industrial production.

The invention relates to the technical field of polyester degradation, in particular to a selective depolymerization method of polyester in a polyester composite material. The selective depolymerization method comprises the following steps: carrying out a depolymerization reaction on a polyester composite material, a cosolvent, a depolymerization agent and a basic catalyst at normal pressure and a temperature not higher than 65 DEG C, the cosolvent is at least one of an ethylene glycol diether compound, a propylene glycol diether compound and an isobutyl ketone compound. According to the selective depolymerization method, an ethylene glycol diether compound, a propylene glycol diether compound and an isobutyl ketone compound are used as cosolvents, a depolymerization agent is used as a methylation reagent, and directional polyester depolymerization of a polyester composite material can be realized at normal pressure and the temperature not higher than 65 DEG C; when the polyester material is degraded, the non-polyester material is basically not degraded or depolymerized, and the selective depolymerization and separation of the polyester composite material such as a polyester blended fabric can be realized.