128 results about "Mercaptoacetic acid" patented technology

The invention discloses a silane modified polyether flame-retardant adhesive and a preparation process thereof, and relates to the technical field of sealants, a phosphate plasticizer is selected as a plasticizer, a flame-retardant filler is selected from any one or two of aluminum hydroxide and magnesium hydroxide, and silane modified polyether resin is added as flame-retardant resin. All the components are compounded and mixed to obtain the modified flame-retardant adhesive, and the flame-retardant resin, the flame-retardant filler and the plasticizer have a good synergistic flame-retardant effect, so that the flame-retardant adhesive achieves a good flame-retardant effect. According to the invention, mercaptoacetic acid modified silicon resin microspheres are prepared, then the mercaptoacetic acid modified silicon resin microspheres react with lead acetate and zinc acetate by utilizing the adsorbability of sulfydryl to prepare modified silicon resin, and the silicon resin is an anti-dripping flame retardant and can form a stable and compact carbon layer structure after combustion; lead acetate and zinc acetate are beneficial to dehydrogenation and charring in the combustion process, so that the flame retardant property is further improved.

The invention relates to a low-smoke halogen-free flame-retardant plastic and a preparation method thereof, and belongs to the technical field of flame-retardant high polymer materials. The flame-retardant plastic is prepared from the following components: 12 to 17 weight percent of magnesium hydroxide superfine powder, 4.5 to 6.2 weight percent of modified flame retardant, 5 to 7 weight percent of flexibilizer, 0.9 to 1.2 weight percent of lubricant, 0.3 to 0.4 weight percent of antioxidant and the balance of PBT (Polybutylene Terephthalate) resin, the modified flame retardant is prepared by the following steps: reacting pentaerythritol with phosphorus oxychloride to prepare hydroxyl-containing polyhedral oligomeric phosphate, esterifying acryloyl chloride and the hydroxyl of the polyhedral oligomeric phosphate to prepare a monoester intermediate, and finally performing click addition on sulfydryl of pentaerythritol tetramercaptoacetate and double bonds of the monoester intermediate. The modified flame retardant interacts with magnesium hydroxide, a stable hollow carbon net is formed in the flame retardant process, and the hollow carbon net has a multi-layer adsorption and filtration effect on smoke particles, so that the release of smoke is reduced, and the smoke density is greatly reduced.

The invention belongs to the field of chemical engineering, and relates to a preparation method of a high-chroma bismuth vanadate pigment for a coating, which comprises the following steps: mixing a titanium-based ion sieve with an acidic vanadium leachate, filtering after the reaction is completed to obtain a first filtrate, adding mercaptoacetic acid into the first filtrate, and filtering after the reaction is completed to obtain a second filtrate; preparing a bismuth salt solution containing yttrium ions and zirconium ions, mixing the bismuth salt solution with the second filtrate, adjusting the pH value to be in linear gradient change from acidity to neutrality, heating to a first temperature at a set heating rate, aging, centrifuging and drying to obtain a precursor; and calcining the precursor at a second temperature to obtain the bismuth vanadate pigment. According to the method, the acid vanadium leaching solution is used as a raw material, and the bismuth vanadate pigment with high chromaticity and chemical stability is obtained while the production cost is reduced through an innovative ion sieve purification technology and lattice stabilization doping, so that the method has obvious economic benefits.

The invention discloses a sodium alginate embedded iron-carbon microcapsule material for repairing cadmium and arsenic polluted soil and a preparation method of the sodium alginate embedded iron-carbon microcapsule material, and belongs to the technical field of soil heavy metal pollution repairing materials. The material comprises straw biochar, high-iron steel slag powder, a sulfydryl acetylated chitosan-iron monatomic cluster compound, a boron-doped graphitized carbon coated cobalt ferrite nanosheet, sodium alginate, calcium chloride and sodium carbonate. Wherein the sulfydryl acetylated chitosan is prepared by reacting chitosan with sulfydryl acetic anhydride, dialyzing and drying, and performing solvothermal reaction with ferric nitrate under high pressure. The preparation method comprises the following steps: pyrolyzing and drying the straw biochar, reacting the high-iron steel slag with sulfuric acid, adding the biochar, adjusting the pH value, adding sodium carbonate, mixing to obtain an iron-carbon-based passivation material, mixing with two modified compounds, mixing with a sodium alginate solution, dropwise adding a calcium chloride solution, and stirring and curing. The material can be applied to remediation of cadmium and arsenic polluted soil.

The invention belongs to the technical field of corrugated paperboards, and is characterized in that wood fibers and modified bamboo fibers prepared by reaction of allyl bamboo fibers, 1, 4-butanediol di (mercaptoacetate) and magnolol are pulped, a biodegradable water-resistant auxiliary agent is added for hydrophobic modification, papermaking and shaping are carried out to prepare water-resistant base paper, and the water-resistant base paper is prepared by the following steps: pulping the modified bamboo fibers and the biodegradable water-resistant auxiliary agent. And finally, preparing a surface paper layer, a corrugated medium paper layer and an inner paper layer from the water-resistant raw paper, and bonding and pressing to obtain the corrugated board. Magnolol groups grafted on the surfaces of the modified bamboo fibers can improve the water absorption performance of the fibers, and the hydrophobicity of the corrugated board is improved through the synergistic effect of the magnolol groups and the biodegradable water-resistant auxiliaries; the surface of the biodegradable water-resistant auxiliary agent is embedded with a carboxylated nano-cellulose structure, so that the biodegradable water-resistant auxiliary agent has deformation resistance; the epoxidized soybean oil is used as a core part and has excellent hydrophobicity; through combination of a polyphenol structure of tannic acid and hydrogen bonds of water-resistant base paper fibers, the mechanical properties of the corrugated board are improved, and the corrugated board has excellent biodegradability, hydrophobicity and mechanical strength.

The invention discloses a lithium ion battery artificial graphite negative electrode material, a preparation method thereof and a lithium ion solid-state battery, and belongs to the technical field of lithium ion solid-state batteries. Carrying out flash evaporation Joule heating on the pretreated carbon source material in an inert atmosphere, then rapidly cooling to obtain a graphitized intermediate, and screening, washing and drying the graphitized intermediate; mixing and reacting the graphitized intermediate with strong acid under an ice bath condition, and oxidizing and expanding the graphitized intermediate to obtain expanded graphite; and mixing the expanded graphite with mercaptan acetic acid and ethyl acetate, adding a catalyst, and reacting for a certain time to obtain the artificial graphite negative electrode material of the lithium ion battery. According to the invention, by introducing a flash Joule pulse graphitization technology, sulfur-oxygen dual-function synergistic modification and structure-performance integrated design, three technical bottlenecks of a traditional artificial graphite negative electrode material are systematically solved: the rate capability is limited, the interface stability is poor and the volume expansion is obvious.

The invention discloses a preparation method and application of a water-based mixed binder, and relates to the technical field of water-based binders. The water-based mixed binder is obtained by mixing and compounding a water-based polyurethane emulsion and polyvinylidene fluoride. Wherein in the preparation process of the waterborne polyurethane emulsion, amino-terminated polyacrylic acid-catechol is added to serve as a chain extender for use, the amino-terminated polyacrylic acid-catechol is prepared by initiating polymerization of 4-allyl catechol, alkenyl siloxane and an acrylic monomer, and after polyacrylic acid-catechol is prepared, the amino-terminated polyacrylic acid-catechol is added to serve as a chain extender for use; and carrying out an ultraviolet irradiation click reaction on the obtained product and mercaptoacetic acid ethanolamine ester. The waterborne polyurethane emulsion prepared by the invention can greatly improve the electrochemical performance of the lithium battery, and especially has a great improvement effect on the peel strength, the cycle discharge specific capacity and the coulombic efficiency of the lithium battery.

The invention relates to the technical field of coatings, in particular to graphene-based composite zinc powder primer as well as a preparation method and application thereof. The primer is formed by mixing and curing a component A and a component B, wherein the component A comprises organic bentonite, a polar additive, a mixed solvent, a silane coupling agent, a dispersing agent, epoxy resin, a defoaming agent, a flatting agent and graphene-modified zinc-tin composite powder; the component B comprises polyamide and a mixed solvent; the graphene-modified zinc-tin composite powder is prepared by the following steps: treating zinc powder to obtain carboxylated zinc powder, modifying the carboxylated zinc powder with mercaptoacetic acid and 4-mercaptophenyl acetic acid to obtain surface modified zinc powder, reacting the surface modified zinc powder with stannous chloride to obtain zinc-tin composite powder, and finally carrying out ball-milling compounding on the zinc-tin composite powder and graphene oxide. The anti-corrosion coating can effectively inhibit zinc powder agglomeration and enhance interface bonding, has excellent corrosion resistance, adhesive force and mechanical properties, and is suitable for metal corrosion resistance in severe environments such as ocean engineering and the like.

The invention relates to the technical field of production and preparation of ammonium tetramolybdate, and particularly discloses a preparation method for producing high-purity ammonium tetramolybdate from low-grade molybdenite. The preparation method for producing the high-purity ammonium tetramolybdate from the low-grade molybdenite comprises the following steps: S1, pretreating the low-grade molybdenite to obtain slag, and roasting the slag to obtain roasted slag; s2, the roasted slag and an ammonia water solution are mixed and leached, and a leaching solution is obtained; s3, an impurity removal agent and an adsorbent are added into the leachate for adsorption and purification, the impurity removal agent comprises mercaptoacetic acid and disodium ethylene diamine tetraacetate, the adsorbent is modified calcium alginate, and after purified liquid passes through an anion exchange resin column, an ammonium molybdate solution is obtained; and S4, adding a nitric acid solution into the ammonium molybdate solution, adjusting the pH value, and then crystallizing to obtain high-purity ammonium tetramolybdate. According to the preparation method, the purity of the ammonium molybdate solution is effectively improved through three procedures, and then the purity of ammonium tetramolybdate prepared from low-grade molybdenite is effectively improved.

The invention relates to a preparation device and method for isooctyl thioglycolate, and particularly to the technical field of chemical intermediate preparation. A synthesis tank and a stirring mechanism are provided, the stirring mechanism is placed in a synthesis space of the synthesis tank, raw materials for isooctyl thioglycolate to be synthesized are placed into the synthesis space of the synthesis tank according to a set molar ratio, a first driving member arranged outside the synthesis tank is connected to a portion of a first stirring member extending out of the synthesis space, and a free end of the first stirring member is connected to a second stirring member via a cross universal joint, a sliding member is slidably sleeved on the outer periphery of the first stirring member, and the sliding member is slidable along the first stirring member until it engages with the cross universal joint. The first driving member drives the first stirring member to rotate, thereby stirring different areas in the synthesis space and uniformly dispersing thioglycolic acid and isooctyl alcohol, thereby improving the manufacturing efficiency of isooctyl thioglycolate.

The application discloses a high viscosity-reducing polycarboxylic water reducing agent for ultra-high performance concrete and a preparation method thereof, and comprises the following steps: adding a metered amount of deionized water into a reaction container, and then adding a methyl allyl polyoxyethylene ether, sodium methallyl sulfonate, an alkyl acrylate, and styrene into the reaction container, stirring, and heating; adding a metered amount of hydrogen peroxide, and simultaneously dropping a mixed aqueous solution of acrylic acid AA and methoxy polyethylene glycol methacrylate MAA-MPEG and a mixed aqueous solution of mercaptoacetic acid and ascorbic acid; and after dropping, keeping warm. The prepared polycarboxylic water reducing agent can improve the dispersibility of the polycarboxylic water reducing agent, reduce the hydrophilicity of the whole polycarboxylic molecule, and obviously reduce the viscosity of concrete; under the premise that the concrete has good workability, the viscosity of high-grade concrete can be obviously reduced; the polycarboxylic water reducing agent has good adaptability to different types of cement, avoids the need to seek different types and structures of water reducing agents for different types of cement, and is beneficial to practical engineering application.

The invention relates to the technical field of high polymer materials, and particularly discloses a high-strength polyurethane adhesive as well as a preparation method and application thereof. The adhesive is prepared by compounding a double-bond-terminated polyurethane prepolymer monomer and a multi-sulfydryl cross-linking agent. And the prepolymer monomer is synthesized by reacting 4, 4-diisocyanate dicyclohexylmethane and hydroxyethyl (meth) acrylate according to a molar ratio of 1: 2. The polythiol cross-linking agent is tetrakis (3-mercaptopropionic acid) pentaerythritol ester or tetrakis (2-mercaptoacetic acid) pentaerythritol ester. When in use, the two components are mixed and then coated on a base material, and the mixture is cured at 30-100 DEG C for 0.5-5 hours. The adhesive disclosed by the invention forms a compact network through multiple crosslinking mechanisms such as sulfydryl-alkene Michael addition, so that the adhesive has extremely high shear strength (up to more than 30MPa) and excellent heat resistance and aging resistance on metal, glass, glass fiber plates and the like.

This invention belongs to the field of analytical detection technology and relates to a method for detecting estradiol using a combination of organometallic framework enrichment and enzyme-linked immunosorbent assay (ELISA). A magnetic organometallic framework solid-phase extractant is used to enrich estradiol in the sample, followed by detection of the enriched estradiol using ELISA. The magnetic organometallic framework solid-phase extractant is prepared by subjecting mercaptoacetic acid-modified Fe3O4 particles, zirconium salt, and 2-amino-terephthalic acid to a solvothermal reaction at 110–130°C for 22–26 hours. The detection method provided by this invention has advantages such as short detection time, high sensitivity, good specificity, and high accuracy, thereby enabling the detection of trace amounts of estradiol in environmental water samples.

The invention provides a method for extracting sodium thioglycollate from ethionine ester synthesis wastewater, which comprises the steps of wastewater pH regulation, extraction, washing, reverse extraction and evaporation concentration, and is mainly applied to recovery of by-product sodium thioglycollate in ethionine ester production wastewater. The method can be used for deep separation of sodium thioglycolate and other impurity inorganic salts such as sodium chloride and sodium carbonate in other systems, can be used for extraction of sodium thioglycolate under a weak acidic condition, and does not have the problems of easy volatilization and high toxicity.

The application discloses a method for alcohol-assisted chemical bath deposition of an electron transport layer of a perovskite solar cell and the perovskite solar cell, and the method comprises the following steps: cleaning a substrate to obtain a clean conductive glass substrate; adding SnCl2.2H2O into an isobutyl alcohol aqueous solution, then adding urea, and then adding mercaptoacetic acid and concentrated hydrochloric acid to mix, so as to complete preparation of a chemical bath solution; placing the clean substrate into the chemical bath solution to soak and depositing reaction in an oven, and then performing cleaning and annealing treatment after the reaction is completed, so as to complete deposition of a SnO2 electron transport layer on the conductive glass substrate. The SnO2 electron transport layer deposited by the method for alcohol-assisted chemical bath deposition of an electron transport layer is more uniform, the agglomeration of nanoparticles is reduced, the transmittance of sunlight is higher, the utilization rate of sunlight of the perovskite solar cell is improved, the open-circuit voltage and the short-circuit current density of the cell are reduced, and therefore the photoelectric conversion efficiency of the perovskite solar cell is improved.

The invention discloses an industrial production method of a quinoline mercaptoacetic acid sulfonamide compound, which comprises the following steps: carrying out condensation reaction on an intermediate D-3 and methyl sulfonamide under the action of a condensing agent, concentrating under reduced pressure until no liquid flows out after the reaction is finished, adding acid, separating out a large amount of solid, filtering, pulping a filter cake with purified water, filtering and drying to obtain the quinoline mercaptoacetic acid sulfonamide compound. A compound D is obtained. The problems that in the prior art, the reaction yield is low, starting material impurities are contained, and the process is complex are solved, and the prepared compound D is low in cost, simple in process operation, high in yield, stable in quality and suitable for large-scale industrial production.

The application discloses a combined depressor for recovering scheelite from ultra-low-grade tungsten-molybdenum associated ore and a method, the combined depressor comprising sodium humate, sodium mercaptoacetate, ammonium citrate, sodium pyrophosphate, sodium fluosilicate and lead nitrate, and the six kinds of substances are configured into the combined depressor in a proportion of 1:1:(2-5):(1-5):(1-3):(2-5). The application aims at recovering scheelite from low-grade refractory ore, improves the separation effect of scheelite and gangue minerals, improves the scheelite recovery rate and the concentrate grade, and improves the economic benefit.

The invention provides an agent composition for improving the recovery rate of copper, nickel, iridium and rhodium in copper-nickel symbiotic sulfide ore, and the agent composition comprises the following raw materials in parts by mass: 85-90 parts of sodium diethyldithiocarbamate, 1-10 parts of mercaptoacetic acid-2-naphthylamine, 1-5 parts of furanformyl dioxime and 1-10 parts of dialkyl dithio-oxadiamide. The invention also provides a use method of the medicament composition. The use method comprises the step of adding the sodium diethyldithiocarbamate, the mercaptoacetic acid-2-naphthylamine, the furanformyl dioxime and the dialkyl dithio-oxadiamide at different time. The raw materials of the medicament provided by the invention are synergistically used, and recovery of independent iridium and rhodium minerals and iridium and rhodium minerals closely linked with (or wrapped by fine nickel sulfide and copper) fine nickel sulfide and copper in ores is considered.

The present application provides, in one embodiment, a cleaning method which is excellent in resin mask removal, and which can suppress corrosion and discoloration of copper. The present application relates, in one embodiment, to a cleaning method of a substrate, which includes a step of peeling a resin mask from a substrate having a copper-containing metal layer and the resin mask on a surface, using a cleaning agent composition containing an alkali agent (component A), an ammonium ion (NH4 + , component B), mercaptoacetic acid (component C), and water (component D), and the molar ratio (B / C) of component B to component C is 1.5 or more.

The utility model provides an improved treatment device for isooctyl thioglycolate synthesis waste gas, which comprises a base, a buffer tank, a treatment tank, a first alkali neutralization layer, a first catalytic treatment unit, a spray pipe, a heatable guide adsorption purification tank structure and a humidifiable multiple purification box structure, and the buffer tank is arranged on the left side of the upper end of the base; the treatment tank is fixed on the right side of the upper end of the base; a first alkali neutralization layer is arranged at the bottom of the inner wall of the treatment tank; a first catalytic treatment unit is arranged in the middle of the lower part of the inner wall of the treatment tank. Through the arrangement of the heating box, the sealing cover, the heating pipe, the guiding and conveying tank, a second alkali neutralization layer, a shielding cover, sieve plates and a second catalytic treatment unit, gas enters the guiding and conveying tank in the using process, and then adsorption treatment work is carried out through an activated carbon adsorption net arranged between the sieve plates; and the adsorption cleaning work can be conveniently carried out in the treatment process.

The invention belongs to the technical field of building material admixtures and relates to a water-reducing hydrated calcium silicate composite early strength agent as well as a preparation method and application thereof. Wherein the polycarboxylic acid water reducer comprises the following components: acrylic acid, methallyl alcohol polyoxyethylene ether, mercaptoacetic acid and 2-hydroxy-4 '-(2-hydroxyethoxy)-2-methyl propiophenone, and the molar ratio of the acrylic acid to the methallyl alcohol polyoxyethylene ether is (5-7): 1; the mercaptoacetic acid accounts for 0.8%-1.6% of the total mole number of the acrylic acid, and the 2-hydroxy-4 '-(2-hydroxyethoxy)-2-methyl propiophenone accounts for 0.84%-0.85% of the total mole number of the methallyl alcohol polyoxyethylene ether. According to the invention, the molecular structure of PCE is accurately designed, and PCE is used as a key regulating agent to actively regulate the nucleation process of C-S-H and the steric hindrance effect among particles, so that the aggregation tendency of the particles is inhibited, the small particle size of the product is ensured, and the long-term dispersion stability is given to the product.

The invention discloses a preparation method of a viscosity-reducing admixture based on machine-made sand concrete, and belongs to the technical field of energy conservation and environmental protection. The method comprises the following steps: adding silicon dioxide sol into a mixed solvent, adjusting the pH value, adding 3-(methylacryloyloxy) propyltrimethoxysilane, and carrying out a heating reaction to obtain a dispersion liquid; the preparation method comprises the following steps: mixing acrylic acid, methoxy polyethylene glycol methacrylate, 2-acrylamide-2-methylpropanesulfonic acid, 2-(methylacryloyloxy) ethyl dimethyl (3-sulfopropyl) ammonium inner salt and deionized water, adjusting the pH value, and adding ammonium persulfate for polymerization to obtain a first mother solution; adding the dispersion liquid and mercaptoacetic acid into the first mother solution, adding heptadecafluorodecyl trimethoxysilane, and heating to obtain a second mother solution; through a multi-scale composite strategy, interface lubrication and dispersion stability are realized, the viscosity of the machine-made sand concrete is remarkably reduced, the pumpability and compatibility are improved, and energy conservation and environmental protection are considered.

The invention discloses a composite adsorption material for synergistically removing ammonia gas and sulfide in a pet environment and a preparation method of the composite adsorption material, and belongs to the technical field of environment functional materials and gas purification. According to the composite adsorption material, zeolite and attapulgite are used as a porous inorganic matrix, an interface adhesion layer is constructed on the surface of the porous inorganic matrix through dopamine oxidation auto-agglutination, histidine-iron coordination is introduced to form enzyme-like active sites, meanwhile, a reversible sulfur capture structure is constructed through mercaptoacetic acid, a proton transfer network is constructed through phytic acid, and the porous matrix is subjected to synergistic modification; on the basis, zinc chloride, ferric nitrate, sodium carboxymethyl cellulose and polyvinyl alcohol are combined to prepare the composite adsorption material. According to the invention, by constructing a multi-stage synergistic system of bionic enzyme active sites, a dynamic sulfur capture structure and a proton transfer network, efficient synergistic removal of ammonia gas and hydrogen sulfide is realized, the stability and recycling performance of the material in a high-humidity environment are remarkably improved, and the material has a good application prospect.

The invention discloses a preparation method of an enhanced warp-knitted lace fabric, and aims to solve the problems that fibers such as cotton fibers with relatively high water absorption capacity do not have a quick-drying characteristic, have poor antibacterial performance after long-term retention of water, still go mouldy and stink, and are low in skin-friendly property. According to the technical scheme, the method is characterized by comprising the following steps that S1, spandex filaments are stretched to a certain drafting length, then nylon filaments are evenly wound on the outer surfaces of the stretched spandex filaments according to a certain twist degree, and the nylon elastic covering yarn is obtained. The antibacterial acarus killing layer is made of cotton fibers with high water absorption, and treatment is conducted through composite alkali liquor, alkali liquor, a mercaptoacetic acid solution and a silver nitrate solution in sequence in the preparation process, so that antibacterial substances can be stably embedded into the fibers instead of being only attached to the surface layers of the fibers, and the antibacterial acarus killing effect is achieved. Furthermore, good antibacterial performance can be kept in the states of multiple times of water washing and long-term soaking.

The invention discloses a method for preparing ammonium thioglycolate from thionocarbamate production waste liquid, which comprises the following steps: 1) adding acid into the thionocarbamate production waste liquid to obtain a solution containing thioglycolic acid; (2) extracting the solution containing mercaptoacetic acid by adopting an extracting agent to obtain an extracting solution containing mercaptoacetic acid; the extraction agent comprises an amine extraction agent; and (3) carrying out back extraction on the extracting solution containing mercaptoacetic acid by adopting ammonia water, so as to obtain a back extraction solution containing ammonium mercaptoacetate. According to the method, ammonium thioglycolate is prepared from the thionocarbamate waste liquid, so that the problem of recycling the sodium thioglycolate waste water generated in the thionocarbamate production process is solved, and ammonium thioglycolate with relatively high economic value is obtained. In addition, the extraction process in the method can also realize separation of sodium salt and other organic impurities in the wastewater containing sodium thioglycollate.

This invention relates to the field of mineral processing flotation reagents, specifically disclosing a high-efficiency collector for the flotation of sphalerite and its preparation method. The high-efficiency collector provided by this invention achieves synergistic enhancement of the functions of each component by compounding isopropyl xanthate, dialkyl dithiocarbamate, and mercaptoacetate, and introducing a designed and synthesized polymeric synergist. The three basic collector components together constitute a dense and stable primary hydrophobic adsorption layer. The introduced synergist, on the one hand, enhances the adsorption strength and selectivity on the surface of sphalerite through multiple functional groups; on the other hand, its grafted hydrophilic polymer chains can form steric hindrance at the mineral-water interface and regulate local hydrophilicity and hydrophobicity, thereby further optimizing the hydrophobic state of the mineral surface and inhibiting gangue inclusions. The composite reagent provided by this invention improves the recovery rate of useful minerals while ensuring concentrate quality.

The invention relates to the technical field of photoelectric materials, in particular to a perovskite thin film material and a preparation method thereof. The thin film material comprises a conductive substrate and a narrow-band-gap perovskite layer, an intermediate interface modification layer and a wide-band-gap perovskite layer which are sequentially coated on the conductive substrate from bottom to top, the chemical general formula of the narrow-band-gap layer is MAmFAnPb1-cGecI3-gamma Br gamma, the chemical general formula of the wide-band-gap layer is FAxCsyPb1-aMaI3-beta Br beta, and the intermediate interface modification layer is formed by compounding mercaptoacetic acid and nano titanium dioxide. According to the material, through the synergistic effect of lamination band gap complementation, ion doping and composite interface modification, 400-1100 nm wide spectrum efficient absorption is achieved, the defect state density is remarkably reduced, the photoelectric conversion efficiency and the long-term stability are improved, and a key technical support is provided for perovskite solar cell industrialization.

This invention belongs to the field of materials preparation, specifically relating to a functionalized MOF composite material and its preparation method and its application in the purification of glycyrrhizin. The preparation steps of the functionalized MOF composite material of this invention are as follows: (1) 5-sulfonic acid isophthalic acid is added to a solvent, dissolved, mercaptoacetic acid is added, stirred, and a ligand solution is obtained; then a zinc salt solution is added, stirred, acetic acid is added to adjust the pH to 4-5, and an ion exchange resin is added to form a suspension; (2) the suspension is heated in a closed environment, reacted at a constant temperature, cooled, the precipitate is collected, washed, soaked, activated and dried to obtain Zn-MOF-SH; (3) Zn-MOF-SH is dispersed in a buffer solution, EDC and NHS are added sequentially, activated, and then glucosamine is added. The reaction is shaken at 30-45℃ for 6-12 hours, centrifuged, washed, and the functionalized MOF composite material is obtained. The MOF material of this invention can specifically recognize and adsorb glycyrrhizin molecules, achieving efficient and selective separation and purification of them.

This invention relates to the field of surface engineering technology, specifically to a low-temperature, rapid-curing microwave absorbing coating and its preparation method. The microwave absorbing coating, by mass percentage, comprises 20-80 wt% microwave absorbing agent, 20-80 wt% epoxy resin, 10-50 wt% diluent, and 2-7 wt% epoxy resin-modified polythiol. The preparation method includes the following steps: mixing the microwave absorbing agent, epoxy resin, and diluent in the specified mass percentages to obtain a mixed slurry; mixing pentaerythritol, mercaptoacetic acid, p-toluenesulfonic acid, and toluene and performing an esterification reaction; mixing the resulting polythiol with bisphenol A type epoxy resin to obtain epoxy resin-modified polythiol; mixing the epoxy resin-modified polythiol with the mixed slurry to obtain a microwave absorbing coating; spraying the microwave absorbing coating onto a substrate; and curing to obtain the microwave absorbing coating. The purpose of this low-temperature, rapid-curing microwave absorbing coating and its preparation method is to solve the problems of slow curing speed and poor environmental performance of microwave absorbing coatings at low temperatures.

The invention provides an MOFs fiber composite material and a preparation method and application thereof, and belongs to the field of fiber composite materials. The composite material takes polyacrylonitrile as a matrix, MOFs (Metal-Organic Frameworks) are cross-linked and compounded by adopting a mercaptoacetic acid locked imine reaction, and the structure of the composite material is shown as a formula 1. The MOFs and polyacrylonitrile are firmly compounded through chemical crosslinking, the problem that the MOFs are not easy to form and separate is solved, adsorption sites containing N and S atoms are introduced into the MOFs fiber composite material through simple thioglycolic acid imine locking reaction, and the adsorption capacity and selectivity of the material to Pd (II) are improved.