301 results about "Carboxylation" patented technology

The invention relates to the field of membrane materials, and discloses an epoxy modified starch-based degradable membrane and a preparation method thereof, the epoxy modified starch-based degradable membrane comprises epoxidized starch, modified nanocellulose and a plasticizer; the modified nano cellulose is prepared by mixing a modified composite filler, a nano cellulose dispersion liquid and a zinc acetate dihydrate aqueous solution; the nano-cellulose dispersion liquid is prepared by adhering polytannic acid formed by oxidation and self-polymerization of tannic acid to the surface of nano-cellulose; the modified composite filler is prepared by performing carboxylation modification on nano titanium dioxide coated fumed silica nanoparticles by using succinic anhydride and gamma-aminopropyltriethoxysilane, then reacting with polyethyleneimine to obtain an aminated composite filler, and finally grafting glycidyl dodecyl dimethyl ammonium chloride to the surface of the aminated composite filler. The prepared film material is high in tensile strength, has certain hydrophobicity, and has good heat resistance, antibacterial property and flame retardant property.

The present invention belongs to the technical field of biomedical materials. Disclosed are a methacrylate, a succinate-diesterified starch, a preparation method therefor and the use thereof in an in-situ filler for corneal defects. The methacrylate, succinate-diesterified starch is prepared by means of performing graft carboxylation on starch and then grafting a double bond. The in-situ filler for corneal defects consists of the methacrylate succinate-diesterified starch (StacMA), gelatin methacryloyl (GelMA), a photoinitiator and a solvent. The corneal filler has a good biocompatibility, an excellent photoresponsive adhesion property and excellent mechanical properties, and can be used for promoting the regeneration of the natural structure of a damaged cornea and the reconstruction of visual function.

The invention relates to the technical field of papermaking, and particularly provides high-strength tipping base paper for cigarettes and a preparation process of the high-strength tipping base paper. The tipping paper base paper for the cigarettes comprises a fiber raw material; functionalizing the nano cellulose; a cellulase; a dry strength agent; a wet strength agent; and a sizing agent. Nano cellulose is functionalized and a synergistic stepped enhancement mechanism is constructed, so that the synergistic breakthrough of the high-strength raw tipping paper for cigarettes in the aspects of strength, wet strength and air permeability is realized; after the functionalized nanocellulose is subjected to carboxylation treatment, the hydrogen bond and electrostatic adsorption between the functionalized nanocellulose and the fiber are enhanced, and the bonding strength in a dry state and a wet state is remarkably improved; meanwhile, the wet strength agent is added in stages, and the adsorption sequence of the dry strength agent is optimized, so that the reinforcing agent constructs a stable three-dimensional network framework in the paper sheet, and the end breaking risk under high-speed winding is effectively reduced.

The invention relates to the technical field of electronic materials, in particular to a preparation method of low-halogen alkali-soluble photosensitive resin and solder resist ink. Comprising the following steps: adding amino resin, alcohol olefin and a catalyst A into a solvent, mixing, and carrying out an ether exchange reaction to obtain an initial etherified product; adding peroxide into the initial etherification product, and carrying out epoxidation reaction to obtain an epoxy resin intermediate; adding an olefine acid compound, a catalyst B and a polymerization inhibitor into the epoxy resin intermediate, and carrying out ring-opening esterification reaction to obtain an epoxy acrylate intermediate; and adding acid anhydride into the epoxy acrylate intermediate, and carrying out carboxylation reaction to obtain the low-halogen alkali-soluble photosensitive resin. The problem of high halogen content of the existing alkali-soluble photosensitive resin is solved, and the solder resist ink prepared from the alkali-soluble photosensitive resin has high sensitivity, high resolution, high heat resistance, high acid and alkali resistance and high electrical insulation property.

The invention relates to the field of oral cavities, and particularly discloses a lasting antibacterial type composite tooth socket for medicine carrying and a preparation method thereof.The lasting antibacterial type composite tooth socket comprises an adsorption layer and an antibacterial membrane layer, the adsorption layer is used for adsorbing oral cavity treatment liquid medicine, and the antibacterial membrane layer comprises a nano-silver antibacterial layer and a chitosan antibacterial layer; the preparation method comprises the following steps: mixing a tea polyphenol-polylactic acid composite solution, a nano-silver-carboxylation modified cellulose compound and a polyvinyl alcohol solution, and carrying out electrostatic spinning to prepare a nano-silver antibacterial fiber membrane, so as to form the nano-silver antibacterial layer; mixing chitosan with hot water, adding cinnamyl aldehyde, glycerol and boric acid, stirring to obtain a mixed solution, coating one side of the nano-silver antibacterial layer with the mixed solution, and curing to form a chitosan antibacterial layer; the adsorption layer is attached to the side, away from the chitosan antibacterial layer, of the nano-silver antibacterial layer, and then the lasting antibacterial type composite tooth socket for carrying the medicine is prepared through hot-pressing compounding. The drug-loaded composite tooth socket has the characteristic of further improving the antibacterial property and the antibacterial durability of the drug-loaded composite tooth socket.

The invention discloses a green construction of a porous separation membrane and an efficient uranium separation / enrichment method thereof.The method comprises the steps that firstly, mixed-dimension attapulgite clay acid etching powder is modified through phytic acid and then added into a saponin plant extracting solution, and then the mixture is mixed with a sodium alginate-chitosan double-network matrix; a film-forming solution with a high-mechanical-stability gas-liquid interface is obtained through a Pickering foam template method, and then the porous separation film is controllably constructed through cooperative strategies such as film casting, calcium cross-linking and carboxylation. Based on the advantages of a rod / sheet mixed dimension structure of minerals, synergistic interaction of plant derivatives and a spatial orientation regulation and control synergistic mechanism of functional groups, a porous separation membrane with a specific porous structure, excellent mechanical properties and uranium separation efficiency is constructed in a green manner, and the uranium separation efficiency is improved by combining optimization of membrane layer stacking and elution strategies. A high-efficiency uranium separation / enrichment method is developed, and a new normal form is provided for solving uranium pollution prevention and control and resource recovery and enrichment by a membrane separation technology.

The invention discloses a construction method and application of a mixed-dimension attapulgite clay-based porous separation membrane, firstly, mixed-dimension attapulgite clay acid etching powder is added into a saponin plant extracting solution to obtain a suspension, then the suspension is mixed with a sodium alginate / glycerol aqueous solution, a Pickering foam template method is adopted to obtain a membrane forming solution, and the membrane forming solution is dried to obtain the mixed-dimension attapulgite clay-based porous separation membrane. And carrying out film casting, calcium crosslinking and carboxylation treatment to obtain the porous separation membrane. On the basis of the rod / sheet mixed dimension structure advantage of clay minerals and the synergistic stabilization effect of plant derivatives, the interfacial film strength, functional group spatial arrangement and network structure are efficiently regulated and controlled, the separation film with a multi-stage communicating pore structure and excellent mechanical performance and separation efficiency is constructed in a green mode, and the separation efficiency is improved by combining film layer stacking and acid pickling enrichment. A high-efficiency uranium separation / enrichment method is developed, and an innovative solution is provided for uranium pollution prevention and control and resource enrichment by a membrane separation technology.

The application relates to the technical field of fluorine-containing wastewater treatment, and discloses a MOF modified zeolite fluorine removal agent as well as a preparation method and application thereof, which comprises the following steps: subjecting natural zeolite to carboxylation or calcination pretreatment; preparing a MOF precursor; the MOF precursor is prepared from at least two kinds of rare earth metal ions in La 3+ , Ce 3+ or Zr 4+ and an organic ligand; adding the MOF precursor into a DMF solvent, then adding the pretreated natural zeolite, and ultrasonic treatment for 5-10 min; adding the obtained mixed solution into a high-pressure reaction kettle, and reacting at 160 DEG C for 24 h; after the high-pressure reaction kettle is naturally cooled, the mixed solution in the high-pressure reaction kettle is centrifuged, the precipitate is washed with DMF for 3-5 times, and then dried at 65-90 DEG C for 18-24 h, so that the MOF modified zeolite fluorine removal agent is finally obtained. The disclosed fluorine removal agent has larger pore volume and specific surface area, and has good fluorine removal effect.

The invention discloses silver-copper alloy nanoparticles with a core-shell structure as well as a preparation method and application of the silver-copper alloy nanoparticles. The core of the core-shell structure silver-copper alloy nanoparticle is a silver-copper alloy nanoparticle, and the shell of the core-shell structure silver-copper alloy nanoparticle is a ZIF-8 coating layer. The preparation method of the silver-copper alloy nanoparticles with the core-shell structure comprises the following steps: 1) preparing the silver-copper alloy nanoparticles; (2) preparing surface modified silver-copper alloy nanoparticles; and 3) dispersing the surface-modified silver-copper alloy nanoparticles, zinc salt and 2-methylimidazole in methanol for reaction. The silver-copper alloy nano-particles with the core-shell structure have the advantages of rich active sites, good catalytic effect, high cycling stability, mild reaction conditions, simple preparation method and the like, can be used for carboxylation of terminal alkyne and CO2 to generate propiolic acid compounds and carboxylation of propargyl amine and CO2 to generate 2-oxazolidinone compounds; and the method has a very wide application prospect.

The invention discloses an oxidized carbon black composite material and application of the oxidized carbon black composite material in a coating, and belongs to the technical field of carbon black material production.The oxidized carbon black composite material is subjected to a three-layer gradient design of a carboxylation inner core, a double-functional middle layer (hyperbranched and epoxy group) and a polyaniline / DBSA shell; three major breakthroughs of the prepared coating are realized: dispersibility and conductivity are compatible: the settling rate is less than or equal to 1.9% (solving agglomeration), and the resistance is less than or equal to 3.5 * 10 < 4 > omega / sq (constructing a high-efficiency conductive network); hygrothermal environment stability: the resistance change rate is less than or equal to + 9.1% (epoxy group and DBSA synergistically resist hygrothermal degradation); environment protection and waste reduction are achieved, a dispersing agent is replaced with a bio-based material (APG06), and the performance is not affected.

The invention discloses a hydrophilic oleophobic filter material as well as a preparation method and application thereof. The hydrophilic and oleophobic filter material is surface aminated hard particles grafted with polybasic acid, and the hydrophilicity of the hard particles is remarkably improved through amino-carboxylation; on the basis of a silanization reaction, a stable Si-O-Si covalent bond network is formed, an amino functional group is anchored, and further through an amidation reaction, a carboxylic acid group of polycarboxylic acid is directionally introduced into the surface to form a dense strong-polarity modification layer, so that the hydrophilic oleophobic filter material has high stability, long-acting property and excellent underwater oil stain resistance; the hydrophilic and oleophobic filter material and the hydrophobic and oleophylic filter material can form a non-uniform wettability filter material, the hydrophilic particles construct a low-resistance water phase channel to reduce head loss, the hydrophobic particles are utilized to realize interface demulsification and oil drop coalescence, non-demulsified micro-drops are screened and adsorbed layer by layer through a multi-stage filter bed, deep oil-water separation is achieved, and oil-water separation is realized. And the method has strong adaptability to complex oily wastewater containing surfactants and high acid, alkali and salt properties.

The invention discloses a preparation method of high-stability self-crosslinking colloid photon ink for inkjet printing of textiles, and provides a strategy of combining surface carboxylation hard core-soft shell type nano microspheres and fabric surface polymer induction. A reversible addition-fragmentation chain transfer polymerization (RAFT) emulsion polymerization method with high monomer conversion rate and good controllability is adopted, and the surface carboxylated hard core-soft shell type nano microspheres are prepared through a one-pot method. On the basis, a colloidal photon ink system is constructed by compounding a specific functional aid, so that the colloidal photon ink not only can maintain a stable state for 12 months under conventional storage conditions, but also can effectively resist a microsphere agglomeration phenomenon caused by high shear force and temperature shock in an ink-jet printing process, and the problem of nozzle blockage is avoided. According to the technical scheme, on the premise that the low solid content of the system is ensured, the color development saturation and the structural color stability are remarkably improved.

The invention discloses a high-wear-resistance supercritical foaming TPU material and a preparation method thereof, and relates to the technical field of high polymer materials, the material is prepared from the following components by weight: 100 parts of TPU particles, 5-20 parts of a wear-resistant filler, 3-10 parts of a compatilizer, 3-5 parts of a supercritical fluid foaming agent, 1-5 parts of a foaming promoter, 0.5-2 parts of an antioxidant and 0.5-2 parts of a lubricant; the wear-resistant filler is a compound of surface amination modified nano silicon dioxide and surface carboxylation modified polytetrafluoroethylene micro powder, the wear-resistant filler, TPU and other auxiliaries are subjected to melt blending granulation to obtain composite master batches, after the master batches are formed into sample strips, the sample strips are subjected to supercritical fluid impregnation and rapid pressure relief foaming, and the final product is obtained. Through a unique compound wear-resistant system and interface design, excellent wear resistance can still be maintained after supercritical foaming, the industrial problem that the wear resistance of a foaming material is poor is solved, the process is environment-friendly, and industrial production is easy.

The invention mainly relates to the technical field of composite material preparation, in particular to a preparation method and application of a PVDF / MOFs / GO composite membrane, and the preparation method comprises the following steps: cleaning and drying a PVDF membrane for carboxylation treatment; then immersing the PVDF membrane into a sodium hydroxide solution to obtain a carboxylated PVDF membrane; adding GO into deionized water to obtain a solution A; co (NO3) 2.6 H2O is dissolved, and a solution B is obtained; adding the solution A into the solution B, and stirring to obtain a Co < 2 + > / GO mixed solution; and filtering to the surface of the carboxylated PVDF membrane in vacuum, and immersing into a 2-methylimidazole solution to obtain the PVDF / MOFs / GO composite membrane. The compact and uniform MOFs composite material layer rapidly grows on the surface of the polyvinylidene fluoride membrane to prepare the MOFs composite membrane, and the MOFs composite membrane is used as an adsorption membrane to adsorb and separate organic matters or natural products in water, so that wastewater purification and organic matter extraction are realized.

The invention discloses a preparation method of high molecular weight waste rubber powder carboxylation modification and dynamic cross-linked rubber, and belongs to the technical field of high molecular weight waste rubber powder carboxylation modification and dynamic cross-linked rubber preparation. The preparation method comprises the following steps: S1, dispersing high-molecular-weight waste rubber powder in a solvent, adding acrylic acid and an initiator, and heating and stirring to obtain carboxylated waste rubber powder; s2, plastifying the matrix rubber on an open mill for roll coating, adding the carboxylated waste rubber powder in batches, and adding a cross-linking agent and an anti-aging agent at the same time to obtain masterbatch; s3, putting the master batch into an internal mixer, raising the temperature of the master batch to a preset dynamic crosslinking temperature, adding sulfur, an accelerant and other vulcanizing aids, and vulcanizing. Compared with the prior art, reversible chemical bonds can be formed at the interface of rubber powder particles and matrix rubber, and the chemical bonds can be temporarily broken during high-temperature processing and can be re-formed after cooling, so that the strength and the elasticity of the material are recovered.

The invention relates to the field of road asphalt, and discloses high-modulus modified asphalt for improving road performance and a preparation method thereof, the modified asphalt comprises matrix asphalt, coal liquefied asphalt, modified rubber seed oil, ethylene-vinyl acetate copolymer and modified carbon nanotubes; the modified rubber seed oil is prepared from epoxy rubber seed oil and a carboxylated flame-retardant component prepared by reaction of amino trimethylphosphonic acid, trimethylolpropane and malonic acid; the modified carbon nano tube is prepared from a toluene-2, 4-diisocyanate isocyanated carbon nano tube and an aminated modifier through a reaction; the amination modifier is prepared by performing acylating chlorination grafting on 3-(3, 5-di-tert-butyl-4-hydroxyphenyl) propionic acid by using thionyl chloride and then grafting with p-phenylenediamine. According to the invention, the coal liquefaction asphalt, the modified rubber seed oil, the ethylene-vinyl acetate copolymer and the modified carbon nanotube are added into the matrix asphalt; the high and low temperature performance, the flame retardant performance and the anti-aging performance of the asphalt material can be improved.

The invention relates to a method for synthesizing cyclic carbonate by catalyzing olefin oxidative carboxylation with a difunctional ionic liquid, which comprises the following steps: in a synthesis system, adding an oxidant and an additive into olefin serving as a raw material and the difunctional ionic liquid serving as a catalyst, and then carrying out epoxidation reaction; after the reaction is finished, potassium iodide and a carboxylation reagent are added into a reaction system, then cycloaddition reaction is performed, and finally cyclic carbonate can be prepared. The bifunctional ionic liquid is used as a catalyst, so that the olefin epoxidation reaction can be catalyzed, the cycloaddition reaction of an epoxide intermediate and CO2 can also be catalyzed, and the problem that a two-step reaction catalytic system is incompatible is solved. The adopted raw materials are cheap and easy to obtain, a metal-free catalyst is used, the method has the advantages of being economical and environmentally friendly, and an alternative scheme is provided for synthesis of cyclic carbonate.

The invention belongs to the technical field of tumor treatment, and particularly relates to a metal polyphenol network coated drug-loaded mesoporous organic silicon nanoparticle and a preparation method and application thereof.The mesoporous organic silicon nanoparticle (MON) is prepared through a micelle / precursor co-template assembly method, then amination modification, carboxylation modification and drug co-loading are further conducted on the mesoporous organic silicon nanoparticle (MON), and the metal polyphenol network coated drug-loaded mesoporous organic silicon nanoparticle is obtained. The DQMCTH nano-particles are prepared through the steps that DQMCTH nano-particles are taken as a raw material, a copper salt solution and a tannic acid (TA) solution are added and mixed, then a coordination complexation reaction is conducted, hyaluronic acid (HA) is added for modification, and the DQMCTH nano-particles obtained through the method are in a sphere-like shape, regular in shape, uniform in distribution and free of obvious dendritic branches and central radial pore channels. The polypeptide is effectively protected by MPN and is subjected to HA targeted modification; more importantly, the DQMCTH nanoparticles prepared by the method disclosed by the invention show pH / GSH / HAase triple sensitive drug release, and cell and animal experiment results show that the DQMCTH nanoparticles prepared by the method disclosed by the invention have relatively high anti-tumor activity on a drug-resistant breast cancer model.

The application discloses a method for synthesizing nitrogen-containing heteroarene carboxylic acid compounds based on nitrogen-containing heteroarene carbon-hydrogen bond carboxylation reaction and belongs to the technical field of organic synthesis, and specifically comprises the following steps: adding a reaction substrate, an organic catalyst, a base and an additive into a reaction container, then adding a solvent under a CO2 atmosphere, and stirring and reacting at room temperature or under heating in a light irradiation condition; and performing post-treatment on a reaction product, separating and purifying the reaction product, and obtaining nitrogen-containing heteroarene carboxylic acid compounds and derivatives thereof. The scheme has the characteristics of mild reaction condition, wide reaction substrate range, good yield and good regioselectivity, and cheap and easily-obtained raw materials, can efficiently realize nitrogen-containing heteroarene carbon-hydrogen bond carboxylation reaction, synthesize important nitrogen-containing heteroarene carboxylic acid compounds, and has a good application prospect.

The invention belongs to the technical field of biological medicine, and discloses an aquatic animal antigen system and application thereof. The preparation method comprises the following steps: carrying out carboxylation treatment on bacterial cellulose to prepare carboxylated bacterial nano-cellulose, and then carrying out grafting reaction on the carboxylated bacterial nano-cellulose and an aldehyde group polymer to prepare surface modified nano-cellulose (namely poly (N-isopropylacrylamide) grafted carboxylated bacterial nano-cellulose). The surface-modified nanocellulose is used as a carrier and is chemically connected with a virus antigen protein (namely recombinant G protein) to prepare an antigen system (namely BNC-G) carrying the virus antigen protein. According to the antigen system, virus antigen protein can be delivered into aquatic animal bodies through soaking immunization, the effect of preventing and controlling aquatic animal virus diseases is achieved, and the antigen system is suitable for production of aquatic animal SPF seedlings and preparation of aquatic animal immune protection preparations.

The application discloses a lateral test strip for detecting C-reactive protein and application thereof, and the test strip comprises a bottom plate and a sample pad, a combination pad, a nitrocellulose membrane and a water absorption paper which are sequentially stacked on the bottom plate; the combination pad is loaded with AIE fluorescent microspheres; the AIE fluorescent microspheres are composed of P(St-MMA) microspheres coated with AIE materials after hydrolysis and carboxylation; and anti-C-reactive protein antibodies are connected to the AIE fluorescent microspheres through a covalent bond. The surface coating amount of the AIE fluorescent microspheres is increased by 1.6-2.3 times, and the fluorescence intensity per unit mass is increased by about 40-60%. The increase of the coating amount makes the density of the light-emitting core higher, the overall quantum yield is significantly improved, and the uniformity of the fluorescence signal and the detection sensitivity are enhanced. The characteristics are particularly prominent in the detection of CRP protein in the chromatographic test strip, and the detection limit can be effectively reduced, the T / C signal ratio can be improved, and the reaction time can be shortened.

This invention belongs to the technical field of carbon nanotube modification and conductive paste, specifically relating to a method for preparing polypyrrole-grafted modified carbon nanotubes and a conductive paste, including: carboxylation pretreatment of carbon nanotubes: adding carbon nanotubes to a mixed acid solution and refluxing to obtain carboxylated carbon nanotubes; pyrrole monomer grafting: dispersing the obtained carboxylated carbon nanotubes in an organic solvent, adding pyrrole monomer and a condensing agent to react, obtaining pyrrole-grafted carbon nanotubes; and in-situ polypyrrole polymerization coating: dispersing the obtained pyrrole-grafted carbon nanotubes in an aqueous solution containing a surfactant, adding an oxidant and stirring to react. The following steps are performed: Premixing and coarse dispersion: The polypyrrole-grafted modified carbon nanotubes prepared by the above method are mixed with a first solvent, and a dispersant is added and stirred to obtain a premixed slurry; cyclic grinding and gradient dilution: The obtained premixed slurry is ground and dispersed in two stages to obtain a slurry; high-pressure homogenization and dispersion: The obtained slurry is homogenized, and after homogenization, vacuum degassing is performed, and then the slurry product is filtered and collected. The carbon nanotube conductive slurry of this invention has the characteristics of high solid content, high dispersion, high conductivity, and high stability.

The application belongs to the technical field of food quality monitoring, and particularly relates to a ferric magnetic solid-phase masking agent and a quantitative detection method for lead in vegetable products. The ferric magnetic solid-phase masking agent is prepared by the following method: S1, performing carboxylation on the terminal amino group of DFO to obtain DFO-COOH; S2, coating a SiO2 layer on the surface of Fe3O4 magnetic core to obtain Fe3O4@SiO2; S3, modifying the Fe3O4@SiO2 by amination to obtain Fe3O4@SiO2-NH2; and S4, coupling Ac-DFO with Fe3O4@SiO2-NH2 to obtain Fe3O4@SiO2-DFO. The three hydroxamic acid groups of DFO are combined with Fe 3+ to form a stable chelate, and Fe 3+ can be removed through magnetic separation, the removal rate is increased to more than 99%, and the quantitative detection of lead ions is further faster and more accurate in combination with mature immunochromatography technology.

The invention relates to a preparation method of a PtGaGe alloy-loaded oxygen-doped carbon nanotube and application of the PtGaGe alloy-loaded oxygen-doped carbon nanotube in electro-catalytic oxygen reduction.The preparation method comprises the steps that firstly, the oxygen-doped carbon nanotube is prepared through a carboxylation method, and then platinum nitrate tetraammine, gallium nitrate and ammonium hexafluorogermanate are evenly mixed; the preparation method comprises the following steps: adding a PtGaGe alloy into an aqueous solution of an oxygen-doped carbon nanotube while continuously stirring, uniformly stirring at room temperature, freeze-drying, and roasting in a tubular furnace to finally realize successful loading of the PtGaGe alloy, thereby obtaining PtGaGe / OCNTs. As a novel preparation method, the trimetal alloy can be successfully prepared under the low-temperature condition, and the preparation method has the advantages of being simple in preparation process, mild in reaction condition, controllable in alloy variety and content and the like. According to the invention, the unique double p-d orbital hybridization characteristic in the ternary PtGaGe alloy is utilized, the electron structure of platinum is cooperatively regulated and controlled, the atom utilization rate and the catalytic efficiency of the ternary PtGaGe alloy are simultaneously improved, and the tradeoff relationship between activity and selectivity is successfully broken through.

The invention relates to the technical field of sealants, in particular to a weather-resistant MS sealant and a preparation method thereof. According to the sealant, silane modified polyether resin is used as a matrix, a lignin-based modifier subjected to carboxylation, polyether chain segment grafting and aromatic structure modification is adopted, the dispersity of lignin and the compatibility of polymers are improved through multi-step chemical modification, and nano calcium carbonate, a plasticizer, a coupling agent, a water removal agent, a catalyst and other optimized systems are combined, so that the mechanical property of the sealant is improved. Therefore, the sealant has excellent mechanical properties and weather resistance in extreme environments such as high temperature, high humidity, strong ultraviolet and the like. Compared with the prior art, green renewable resources are utilized, long-acting aging resistance of the sealant is achieved, environmental protection, performance and economical efficiency are considered, and the sealant is suitable for the field of sealing protection of high-requirement buildings and infrastructures.

The application relates to the technical field of acrylic resins, in particular to a high-transparency acrylic resin composition, a preparation process thereof and application of the high-transparency acrylic resin composition to photovoltaics. The high-transparency acrylic resin composition comprises a glycidyl acrylic resin, a curing agent, a plasticizer and a leveling agent, wherein the curing agent is prepared by the following method: firstly, porous nanoparticles are prepared by adopting a sol-gel method with a template agent; secondly, the porous nanoparticles are modified by carboxylation; and finally, the carboxyl-modified porous nanoparticles are grafted with a polyphenol type hindered phenolic antioxidant. In addition, a polysiloxane with a fatty ring structure and an epoxy group is introduced into the glycidyl acrylic resin. The above acrylic resin composition is not only light in quality, has high transparency, but also has good aging resistance, and is an excellent choice as a photovoltaic module packaging material.

The invention discloses a method for preparing 2, 5-furandicarboxylic acid through direct carboxylation, and belongs to the field of organic synthesis. The method comprises the following steps: firstly, preparing carbonate of alkali metal and corresponding oxide into a super-alkali catalyst, then adding 2-furancarboxylic acid alkali metal salt and ester, the super-alkali catalyst and a solvent into a reactor, and blowing out air and water vapor in a system by using dry carbon dioxide airflow; raising the temperature to 120-250 DEG C, and reacting for 2-7 hours under the stirring condition and continuous carbon dioxide gas flow; and filtering, acidifying and washing to obtain a target product. The method has the characteristics of mild reaction conditions, high yield, good color, simple process, suitability for industrial production and the like; the preparation method is economical, environment-friendly and suitable for large-scale industrial production.

The invention relates to the technical field of flame retardance of artificial boards, and discloses a method for preparing a high-flame-retardance-smoke suppression type light medium density fiberboard based on a metal ion complexing technology. The method comprises the following steps: firstly, carrying out swelling pretreatment on a wood fiber raw material by using an alkali-urea mixed solution, and then carrying out carboxylation modification to introduce a carboxyl functional group; then carrying out condensation polymerization on the carboxyl and an amine compound; anchoring metal ions on the surface of the fiber through a complexation reaction between an amine compound and metal ions such as aluminum, magnesium and calcium; and finally, carrying out heat treatment to convert metal ions into a nano metal oxide / hydroxide flame retardant in situ, and carrying out sizing, paving and hot press molding to obtain the medium density fiberboard. Through a chemical anchoring strategy of carboxylation-polycondensation-complexation-in-situ generation, molecular-level uniform dispersion and firm fixation of a flame retardant in wood fibers are realized, and the prepared board not only shows excellent flame-retardant and smoke-suppression performance, but also has enhanced mechanical properties, and has the characteristics of environmental protection and high efficiency.

A layered double hydroxide (LDH) in a heterogeneous electrocatalytic sp 2 Application of C–H activation and CO2 carboxylation. The preparation method of a cobalt-iron molybdate intercalated hydrotalcite (CoFe-Mo LDH) catalyst is as follows: the CoFe-Mo LDH is prepared by a simple coprecipitation method. The CoFe-Mo LDH is used for a heterogeneous electrocatalytic sp 2 C–H activation and CO2 carboxylation. By changing the CoFe-Mo LDH intercalation of the CoFe-Mo LDH solvent environment, a series of mono-carboxylation and di-carboxylation products can be obtained, such as: in the case of benzene as a substrate and DMF as a solvent, a mono-carboxylation product benzoic acid is obtained; in the case of benzene as a substrate and MeCN as a solvent, a di-carboxylation product isophthalic acid is obtained. For the first time, the on-demand switching of the mono-carboxylation and di-carboxylation of phenyl substrates is realized, and this research not only provides a new heterogeneous electrocatalytic strategy to achieve the carbon neutralization target, but also successfully converts cheap and easily available chemicals into high-value and carbon chain growth carboxylic acids under mild conditions.

This invention relates to the field of polyaryletherketone (PAEK) material modification technology, specifically to an ultra-low temperature resistant PAEK composite material and its preparation method, comprising the following materials: PAEK resin, polyethersulfone resin, aramid fibers with surface carboxylation pretreatment, sheet-like thermally conductive filler with a thermal conductivity of at least 400 W / m·K, and a coupling agent; this invention, through the synergistic blending modification of sheet-like thermally conductive filler with polyethersulfone (PES) microspheres and aramid fibers, achieves the advantages of high strength, high toughness, and low thermal stress in the composite material under extreme low temperature environments.