512 results about "Schiff base" patented technology

The invention discloses a high-oxidation-resistance long-life polyethylene cable sheath material and a preparation method thereof, and relates to the technical field of high polymer materials. Comprising the following components: high-molecular-weight high-density polyethylene, surface-modified nano-dioxide, furan-maleimide grafted polyethylene, a Schiff base dynamic cross-linking agent, tea polyphenol grafted polyethylene, a temperature-responsive oxygen-blocking microcapsule, a main antioxidant, an auxiliary antioxidant, an emergency antioxidant, a light stabilizer, a halogen-free flame retardant, a processing aid and an acid absorbent. According to the invention, the main antioxidant, the auxiliary antioxidant and the tea polyphenol grafted polyethylene form a chemically synthesized and naturally modified composite antioxidant system, the designed service life of the material is greatly prolonged, the temperature-responsive oxygen-blocking microcapsule automatically cracks to release the core material when the operating temperature of the cable is greater than or equal to 90 DEG C, a dynamic oxygen-blocking layer is formed, and the service life of the cable is prolonged. The defect that the effect of traditional physical oxygen barrier is attenuated at high temperature is overcome, and the oxygen permeability at high temperature is reduced compared with that of a single nano barrier scheme.

The invention belongs to the field of analytical chemistry, relates to material preparation, and particularly discloses a preparation method of a copper-doped covalent organic framework and application of the copper-doped covalent organic framework in adrenaline colorimetric detection. Firstly, 1H-indazole-4, 7-diamine (Iz) and 1, 3, 5-triformyl phloroglucinol (Tp) are used as monomers to synthesize a novel covalent organic framework (Iz-Tp COF) through a Schiff base reaction, copper ions are introduced into the Iz-Tp COF framework to prepare a novel metal covalent organic framework (Iz-Tp (at) Cu), and then according to the phenomenon that the Iz-Tp (at) Cu can catalyze oxidation color development of epinephrine, the metal covalent organic framework (Iz-Tp (at) Cu can catalyze oxidation color development of epinephrine. According to the present invention, the simple, sensitive and efficient adrenaline colorimetric detection method is established, the test conditions are finally optimized, the standard addition method is combined to accurately determine the adrenaline concentration in the urine, and the good practical application value is provided.

This invention discloses a method for preparing a pH / glucose dual-responsive chronic wound dressing containing frankincense essential oil, comprising: (1) using 4-formaldehyde phenylboronic acid as a crosslinking agent to form Schiff base and borate ester bonds with carboxymethyl chitosan and two different molecular weight hyaluronic acids, respectively, to prepare a hydrogel capable of filling skin surface wounds and performing dual dynamic covalent crosslinking adhesion, and freeze-drying for later use; (2) preparing frankincense essential oil into microcapsules by emulsification coagulation method, and freeze-drying for later use; (3) mixing the hydrogel with the freeze-dried powder of frankincense essential oil microcapsules, adding deionized water or PBS and stirring to reconstitute to form a pH / glucose dual-responsive hybrid hydrogel dressing coated with frankincense essential oil microcapsules. The composite dressing prepared by this invention has anti-inflammatory, antioxidant, antibacterial, and healing-promoting effects, is quick and easy to prepare, and has the ability to respond to the acidic / high-glucose microenvironment of diabetic wounds, and has important practical application value.

The invention discloses a precise construction strategy of a dibenzothiophene sulfuryl covalent organic framework material and systematically explains efficient application of the dibenzothiophene sulfuryl covalent organic framework material in photocatalytic synthesis of thiadiazole and derivatives thereof. The achievement relates to a plurality of leading subjects such as catalytic chemistry, organic synthesis, material science, environmental engineering and green chemistry. According to the method, 2, 4, 6-triformyl phloroglucinol and 3, 7-diaminodibenzo [b, d] thiophene-5, 5-dioxide are taken as construction units, and the crystalline S-COF rich in sulfuryl active sites can be quantitatively obtained through topology-oriented Schiff base condensation under the conditions of protonic acid catalysis, no water and no oxygen. Under the radiation condition of visible blue light, S-COF is used as a heterogeneous photocatalyst to drive green synthesis of 3, 5-di-p-tolyl-1, 2, 4-thiadiazole and series of derivatives thereof; the invention provides a new catalyst design normal form for light-induced organic conversion, and lays a solid foundation for sustainable development-oriented efficient synthesis chemistry.

The invention relates to the technical field of sewage treatment, in particular to a preparation method of a degradable bactericide for an oil field. According to the invention, a hydroxypropyl guanidine gum-polycaprolactone-ethylenediamine fragment copolymer is taken as a carrier, a methylisothiazolinone quaternary ammonium salt (Q-MIT) bactericide is loaded, and the degradable bactericide for the oil field is obtained by cooperating with a dodecyl ethyl sulfide (TC-SE) bactericide and combining with sodium polyaspartate. A carrier forms a hydrogen bond with a polar group on the surface of a biological membrane through a hydroxypropyl guanidine gum main chain to realize targeted anchoring, a polycaprolactone branched chain encapsulates Q-MIT through a hydrophobic effect, primary amino groups of ethylenediamine are introduced to form a pH sensitive Schiff base bond with Q-MIT, and the primary amino groups and adipic dihydrazide form a thermal response hydrazide bond to construct a dual dynamic covalent bond, so that controlled release of Q-MIT is realized, and the biomembrane is prepared. And moreover, the components of the whole system are connected through degradable chemical bonds, so that the environmental protection property and sustainability of oil field operation are guaranteed.

The invention relates to the technical field of detection kits, in particular to a blood coagulation reaction linked lupus anticoagulant fluorescence detection kit and application thereof, the kit contains a screening-confirmation integrated reagent, a calibration product, a quality control product and an anticoagulation interference inhibitor; the integrated reagent is divided into a reagent A and a reagent B, the reagent A contains a buffer solution, recombinant snake venom thrombin, composite phospholipid, a fluorescent substrate and other components, and the reagent B contains prothrombin, calcium ions, high-concentration composite phospholipid and other components; the composite phospholipid system is formed according to a specific proportion and modifies beta2-glycoprotein I, the fluorescence enhancement-stabilization system is formed by matching a Schiff base compound with a stabilizer, the calibrator is a series of lupus anticoagulant standard substances, and the quality control substance comprises simulants with different concentrations and negative control. The anti-interference capability is high, and the influence of anti-coagulant drugs and enzyme source fluctuation is reduced; the signal amplification effect is obvious, the detection sensitivity is high and the reagent stability is good; the operation is simple and convenient, screening and confirmation are integrally completed, and a conventional fluorescence detector is adapted.

The present application relates to a kind of pH / H2O2 dual-response drug-loaded hydrogel and its preparation method and application, by ε-polylysine derivative as antitumor active ingredient, with oxidized dextran through Schiff base reaction crosslinking rapid gelation. While using 2-formylphenyl boronic acid covalently package CD73 small molecule inhibitor APCP. ε-polylysine derivative has oncolytic activity, can induce ICD and promote the infiltration of immune cells in tumor cells. CD73 small molecule inhibitor APCP can block extracellular CD39-CD73-adenosine pathway, reduce the level of immunosuppressive metabolite adenosine in tumor tissue, so as to activate the infiltrated immune cells, restore its anti-tumor function. The hydrogel of ε-polylysine derivative and APCP co-delivery synergistically inhibits the effect of tumor growth, and its curative effect is greater than the treatment effect of single drug, and is superior to positive control drug oxaliplatin (OXA). The pH / H2O2 dual-response hydrogel is rapidly gelled, and has good biological safety under mild reaction conditions.

The present application relates to a kind of shiff base metal complex liquid desulfurizer and its preparation method and use, by amine and aldehyde condensation preparation the structure in the shiff base ligand containing C=N double bond, the lone pair electron of nitrogen atom on shiff base and metal atom are mutually cooperated to form shiff base metal complex, under the condition of oxygen or air as activating agent, the catalyst can be oxidized into inorganic sulfur with organic sulfur.The shiff base metal complex liquid desulfurizer of the present application is synthesized by low-cost raw material, without adding desulfurizer in the desulfurization process, solve the problems such as large amount of existing desulfurizer, need to be added continuously.At the same time, the desulfurizer is liquid desulfurizer, increase the contact area with organic sulfur gas, improve the desulfurization efficiency, the desulfurization rate of methyl mercaptan is higher than 99%.

The invention discloses a bimetallic asymmetric reduction Schiff base catalyst for synthesizing ethylene carbonate and a preparation method of the bimetallic asymmetric reduction Schiff base catalyst. According to the catalyst, a diamine compound is subjected to selective single-side protection, the imine reduction position is controlled, and a bimetallic active center is introduced; the controllable synthesis of a product for reducing the outer side imine and a product for reducing the inner side imine is realized; the obtained product is recrystallized to obtain a monoimine-monoamine type ligand with a clear asymmetric structure, the monoimine-monoamine type ligand and metal salt form a bimetallic catalyst, and the catalyst generates a synergistic effect through double active sites and shows high catalytic activity and excellent product selectivity.

The application discloses an anti-ultraviolet aging polycarbonate modified material and application thereof, and belongs to the technical field of polymer material modification. The material comprises synergistically modified polycarbonate, an organic small-molecule functional regulator, an antioxidant, a light stabilizer, a lubricating dispersant and an inorganic filler, wherein the synergistically modified polycarbonate is constructed into a multiple synergistic network by introducing a borate dynamic covalent structure, a Schiff base structure and a rare earth coordination structure, and the organic small-molecule functional regulator is p-hydroxybenzophenone. The preparation method comprises preparation of the synergistically modified polycarbonate and a subsequent melt blending and extrusion process. Through the technical scheme, the synergistic effect of ultraviolet absorption, energy transfer and free radical inhibition is realized, the yellowing degree of the material is significantly reduced, the mechanical property retention rate and the optical stability are improved, and the material is suitable for the fields of automobile transparent parts, outdoor optical materials and electronic and electrical shell.

This invention discloses a composite hydrogel based on a polysaccharide-based hybrid dual network, its preparation method, and its applications, belonging to the field of marine polysaccharide technology. Based on the important role of amorphous calcium phosphate, a precursor in biomineral formation, in mineralization, this invention prepares a multifunctional composite hydrogel with wet bonding, antibacterial, and remineralization functions. This composite hydrogel can achieve rapid and convenient repair of enamel demineralization. This invention prepares oxidized sodium alginate via an alcohol-aqueous phase using the sodium periodate method. Sodium alginate reacts with carboxymethyl chitosan and dopamine through a Schiff base reaction to form dynamic imine bonds, thus preparing an in-situ self-crosslinking hydrogel. Simultaneously, amorphous calcium phosphate is introduced for secondary crosslinking, preparing a dense dual-network composite hydrogel. The composite hydrogel prepared by this invention has an interconnected three-dimensional porous structure, stable mechanical properties, and uniformly dispersed amorphous calcium phosphate in the form of nanospheres. The composite hydrogel prepared by this invention provides an integrated strategy with clinical translational potential for orthodontic enamel demineralization, with broad market prospects.

The invention relates to the technical field of solid waste resource utilization and building materials, in particular to waste glass fiber reinforced plastic modified concrete and a preparation method thereof. The waste glass fiber reinforced plastic powder is directly added into a concrete material system, microcracks are easily caused, and the overall mechanical property of the concrete is remarkably reduced. In order to solve the technical problems, the waste glass fiber reinforced plastic modified concrete is provided, a PTA coating layer rich in high-activity quinonyl is successfully constructed on the surface of glass fiber reinforced plastic powder through alkaline oxidation auto-polymerization of tannic acid, meanwhile, amino at the tail end of m-KH550 reacts with quinonyl on the surface of GF-coated PTA through Schiff base reaction, a firm imine covalent bond is formed, and therefore the waste glass fiber reinforced plastic modified concrete is obtained. Covalent crosslinking is formed between the glass fiber reinforced plastic powder and the active metakaolin. By introducing the waste glass fiber reinforced plastic powder into a concrete system, the overall mechanical property of the concrete can be remarkably improved.

The application relates to the technical field of catalysts, and discloses a palladium / alumina catalyst and a preparation method and application thereof. A Schiff base phosphine cyclodextrin ligand is synthesized through two-step reactions of nucleophilic substitution and Schiff base condensation, the molecular structure of the ligand covalently bridges the hydrophobic cavity of beta-cyclodextrin and the strong coordination site of diphenylphosphine through a rigid Schiff base bond; subsequently, the phosphine group of the ligand is coordinated with a palladium salt under a specific pH, and a uniform and stable palladium-ligand colloid precursor is formed under the assistance of a directing agent and a stabilizing agent; finally, the colloid is mixed with an alumina carrier for impregnation, drying, and a palladium / alumina catalyst is obtained. Through molecular design and process innovation, the problems of low activity, poor selectivity and insufficient stability of traditional catalysts are solved. When the catalyst is used for preparing hydrogen peroxide by hydrogenating anthraquinone, the hydrogenation efficiency is significantly improved, the selectivity is extremely high, and the cycle stability is excellent, so the catalyst has important industrial application value.

The invention belongs to the technical field of membrane separation, and discloses a composite membrane formed by compounding a loose nanofiltration layer on an ultrafiltration layer and a preparation method and application of the composite membrane. Polyphenol covalent bonds and non-covalent bonds (hydrogen bonds, pi-pi accumulation) are adsorbed on an ultrafiltration membrane matrix to form functional active sites, and then a low-activity aldehyde group substance and polyphenol are subjected to a Schiff base reaction to form a covalent anchoring network; then a flexible long-chain amido substance is introduced to slowly permeate into the network to carry out Michael addition reaction or Schiff base reaction, supplementary crosslinking is carried out with residual functional groups, and finally, the flexible long-chain amido substance reacts with a low-concentration aldehyde solution for a short time to carry out secondary surface crosslinking to form a stable and loose nanofiltration layer network structure. Through step-by-step and interface regulation and control design, the process is simple, the condition is mild, stable and repeated preparation can be realized, and an innovative high-performance technical solution is provided for the practical application of the membrane material for deep treatment and resource recycling of dye wastewater.

The invention relates to the technical field of hydrogel, in particular to a hydrogel system based on oxidized gastrodia elata stem polysaccharide as well as a preparation method and application of the hydrogel system. The preparation method comprises the following steps: performing water extraction and alcohol precipitation treatment on gastrodia elata stems to obtain a gastrodia elata stem polysaccharide sample; the method comprises the following steps: carrying out oxidation treatment on a gastrodia elata stem polysaccharide sample by using sodium periodate, and introducing an aldehyde group into the gastrodia elata stem polysaccharide sample to obtain an oxidized gastrodia elata stem polysaccharide sample; activating chlorogenic acid by using an activating agent to obtain activated chlorogenic acid; the preparation method comprises the following steps: grafting chitosan and activated chlorogenic acid to obtain a graft of chitosan grafted chlorogenic acid; and carrying out Schiff base reaction on a cross-linking accelerant, the oxidized gastrodia elata stem polysaccharide sample and the graft of chitosan grafted chlorogenic acid to obtain the hydrogel system containing the oxidized gastrodia elata stem polysaccharide. According to the preparation method, the replacement frequency of a hydrogel system is reduced by optimizing the structural stability and long-acting moisturizing adhesiveness of the hydrogel, and meanwhile, the recovery effect of the hydrogel system is improved by virtue of the synergistic effect of various active components.

The invention provides a bactericidal anticorrosive composite coating and a preparation method thereof. The composite coating is obtained by reacting and curing raw materials including epoxy resin, an antibacterial substance based on a Schiff base structure and a curing agent, the antibacterial substance based on the Schiff base structure is characterized in that the antibacterial substance based on the Schiff base structure is obtained by carrying out a Schiff base reaction on components including polyethyleneimine and an aldehyde antibacterial agent. In some embodiments, the feedstock further includes a functional polymer PBFGn; the functional polymer PBFGn is obtained by carrying out free radical copolymerization reaction on components including butyl acrylate, hexafluorobutyl methacrylate and glycidyl methacrylate. According to the preparation method of the composite coating, efficient antibacterial components are stably integrated into a tough polymer network through a chemical method and automatically migrate to the surface, and long-acting and stable anti-corrosion and antibacterial effects and improved mechanical properties can be achieved.

The application discloses a silver / schiff base antibacterial material, a preparation method and application, and relates to the field of antibacterial materials.The silver / schiff base antibacterial material, the preparation method and the application are characterized in that, based on the large electron cloud density of the carbon-nitrogen double bond of the schiff base, silver ions in a silver nitrate solution are uniformly adsorbed on a schiff base base through the electrostatic adsorption principle; under the reduction of a reducing agent, the silver ions are reduced to nanosilver ions, and a silver / schiff base antibacterial material is obtained, in which nanosilver ions in the form of nanospheres are uniformly dispersed on the schiff base in the form of a thin sheet layer, thereby greatly improving the dispersibility of the nanosilver ions.The preparation method is simple, low in cost, and capable of batch production, and has no cytotoxicity, and has high antibacterial effects on streptococcus, pseudomonas aeruginosa and staphylococcus aureus, and has a good application prospect.

The application belongs to the technical field of biomedical materials, and discloses a collagen-based double-network porous hydrogel scaffold capable of recruiting endogenous stem cells and a construction method and application thereof. The scaffold takes collagen II (Col-II) and oxidized methyl acrylated hyaluronic acid (AHAMA) as an organic phase, and is constructed into a physical / chemical double-network structure through Schiff base dynamic crosslinking and ultraviolet light-induced methacryl radical polymerization. An air-in-water emulsion template method is used to form a through-porous structure, and 5' aldehyde-modified nucleic acid aptamer Apt19S is anchored in the scaffold network to achieve specific recruitment of endogenous pluripotent stem cells. The scaffold has excellent mechanical properties, a biomimetic extracellular matrix microenvironment and a targeted stem cell recruitment function, can effectively promote the directional differentiation of stem cells into chondrocytes, avoids the immune rejection and ethical issues caused by exogenous stem cell transplantation, and is suitable for the field of articular cartilage defect repair.

A chiral dinuclear Zn(II)-complex based on chiral Salen-type Schiff base ligands (R, R / S, S-L) and its preparation method, along with its application in electro-induced circularly polarized luminescence, were presented. With changes in the configuration of the chiral Salen-type Schiff base ligands, this type of chiral dinuclear Zn(II)-complex exhibited different light colors in the visible region. At room temperature, the chiral dinuclear Zn(II)-complex developed based on chiral Salen-type Schiff base ligands introduced by the methoxy (-OMe) functional group showed maximum emission peaks of 467 and 462 nm in CH2Cl2 solution, with CIE coordinates of (0.156, 0.192) and (0.158, 0.190), respectively, located in the blue light emission region. It exhibited a strong ground-state chiral signal and Cotton effect, with an asymmetry factor |g PL |~10 ‑4 The electroluminescent devices CP-OLED-R,R-II and CP-OLED-S,S-II all have a start-up voltage of 6V. Their maximum emission wavelengths for electro-polarized emission are 488nm and 496nm, respectively, with CIE coordinates located in the blue light region at (0.288, 0.305) and (0.283, 0.304), respectively. The maximum current efficiency of CP-OLED-R,R-II is 0.90cd / A, the maximum power efficiency is 0.47lm / W, and the maximum external quantum efficiency is 0.43%. The maximum current efficiency of CP-OLED-S,S-II is 0.83cd / A, the maximum power efficiency is 0.40lm / W, and the maximum external quantum efficiency is 0.38%. The asymmetry factor |g EL |~10 ‑4 .

The invention relates to the technical field of conductive silver adhesives, in particular to a high-shear-strength conductive silver adhesive and a preparation method thereof.The high-shear-strength conductive silver adhesive is prepared from, by weight, 40-70 parts of conductive silver powder, 10-30 parts of epoxy resin, 2-10 parts of modified liquid resin, 3-10 parts of reactive diluent and 4-8 parts of curing agent. The liquid resin is modified by introducing the silallyl compound containing Schiff base, and the proportion of each component is accurately regulated and controlled, so that the conductive silver adhesive with high shear strength and excellent conductivity is successfully prepared, and the conductive silver adhesive has a wide application prospect in the field of high-end electronic packaging.

The invention belongs to the technical field of hot melt adhesive films, and particularly relates to a hot melt adhesive film with high bonding strength and a preparation method thereof. The preparation method comprises the following steps: (1) mixing o-vanillin double five-membered cyclic carbonate and phosphorus-containing diamine, and carrying out polymerization reaction under a heating condition to obtain a prepolymer; and (2) carrying out vacuum defoaming treatment on the prepolymer, then coating to form a film, curing, cooling and stripping to obtain the film. An o-vanillin bio-based rigid framework and a Schiff base bond structure in the o-vanillin bio-based rigid framework are used for enhancing cohesive energy and interface interaction, and meanwhile, phosphorus is introduced into a polymer main chain in a covalent bond mode, so that intrinsic flame retardance is achieved. The obtained hot melt adhesive film has high tensile strength, high bonding strength, excellent flame retardance and good heat resistance and water resistance.

This invention belongs to the field of biomedical materials technology, specifically disclosing a composite material for promoting the repair of soft tissue defects in the maxillofacial region and its preparation method. The composite material comprises the following raw materials: oxidized hyaluronic acid, carboxymethyl chitosan, dopamine-functionalized hydroxyapatite nanoparticles, strontium salt, copper salt, glycerol, and deionized water. The preparation method includes: firstly, strontium salt and copper salt are hierarchically loaded onto the surface of dopamine-functionalized hydroxyapatite nanoparticles via a dual mechanism of "lattice substitution-surface coordination," and then, together with oxidized hyaluronic acid and carboxymethyl chitosan, construct a "dynamic covalent-hydrogen bond-coordination bond" triple synergistic network through Schiff base reaction, hydrogen bonding, and coordination bonds. This invention solves the technical problems of poor wet surface adhesion, low mechanical strength, single function, and easy burst release of ions in existing repair materials, exhibiting excellent effects such as sequential antibacterial and repair-promoting properties, high adhesion strength, and long-lasting sustained release.

The present application relates to a kind of water gel based on crude polysaccharide of Radix Trichosanthis and its preparation method and application.The water gel based on crude polysaccharide of Radix Trichosanthis is prepared by the following method:1) preparing crude polysaccharide of Radix Trichosanthis;2) making aldehyde group of crude polysaccharide of Radix Trichosanthis to obtain aldehyde group of crude polysaccharide of Radix Trichosanthis;And 3) aldehyde group of crude polysaccharide of Radix Trichosanthis and carboxymethyl cellulose are covalently combined to form the water gel by Schiff base reaction.The multifunctional water gel of the present application is expected to become the candidate dressing of clinical protection and treatment of cachexia wound and other immunosuppressive chronic wound.

The invention relates to the field of biomedicine, and discloses a preparation method and application of an I-type composite photosensitizer with hydrogen sulfide detection performance. According to the invention, TPA-CHO and MN are adopted as monomers, a Schiff base reaction is adopted to synthesize a triphenylamine derivative TPAB with an A-pi-D-pi-A conjugated structure, Cu < 2 + > is further introduced into TPAB molecules, and a stable metal complex composite photosensitizer is formed through a coordinate bond. The functional composite photosensitizer TPAB-Cu < 2 + > has the characteristic of mainly generating I-type ROS and has efficient photodynamic bactericidal activity in an anoxic drug-resistant bacterium infection environment, and in addition, the functional molecule can be applied to drug-resistant bacterium infection microenvironment hydrogen sulfide level detection so as to realize early warning of drug-resistant bacterium infection and real-time detection of a treatment process; the technical problems that in an existing photodynamic therapy, the oxygen dependence of a photosensitizer is high, and the response sensitivity and specificity of a drug-resistant bacterium infection microenvironment are insufficient are solved.

The present invention relates to an ink for the colorimetric detection of copper ions (Cu2+) present in aqueous solutions or an alcohol-water mixture, wherein said ink is based on an organic compound of the Schiff base family, and can be used as a sensor that shows a color change in the presence of copper ions in solution and impregnated onto paper strips at a concentration lower than the maximum permitted in the Mexican standard PROY-NOM-127SSA1-201. The analysis and detection can be carried out using the ink both in solution and impregnated onto paper strips (solid state), showing detection limits of 4.0x10-5 M (9.98 ppm), 8X10-6 m (1.99 ppm), respectively.

The invention relates to the technical field of oilfield exploitation, and provides a self-healing gel plugging system with high wall surface binding capacity and a using method and application thereof.The plugging system is composed of self-healing gel, a wall surface binding agent and a self-healing inducer, and the wall surface binding agent serves as an intermediate to play a bridge role; a catechol group on one side of the nano-sheet has multiple interaction with active sites on the rock surface, and amino on the other side of the nano-sheet and an aldehyde group of a cross-linking agent form a Schiff base bond, so that a wall surface-nano-sheet-gel bridging structure is constructed, and a gel network is firmly anchored on the rock wall surface. The gel network can be crosslinked again to realize self-healing after being damaged by depending on an amino-aldehyde group dynamic reversible bond; the self-healing inducer gradually releases acidic components under stratum conditions, adjusts local pH, promotes aldehyde group-amino condensation crosslinking and improves the long-term stability of the system. Particle fluid channeling can be effectively inhibited, the water flooding swept volume is improved, and therefore the crude oil recovery rate is increased.

The application discloses a kind of superdispersion flame-retardant engineering plastic master batch and preparation method thereof, it is related to functional plastic technical field, including functional master batch, the functional master batch includes the following components by weight parts: nylon 6 sheet 100 parts, modified carbon nanotube 0.5-8 parts, diethyl phosphinic acid ethyl aluminum 5-15 parts, flame retardant 5-15 parts, carbon forming agent 2-5 parts, epoxy silicon dioxide 0.5-5 parts, compatible agent 0.5-5 parts.The application introduces diethyl phosphinic acid ethyl aluminum and flame retardant, forms carbon layer on the material surface when plastic master batch burns, and the interaction between the molecular chains of plastic master batch is improved by Schiff base structure, realizes the double performance improvement of plastic master batch flame retardant and anti-dripping, solves the problem of fire spread caused by melt dripping.

The invention discloses a synthesis method of olefin epoxide and a used catalyst. According to the synthesis method, a complex of a Schiff base ligand and metal ions is adopted as a catalyst, and the structural formula of the Schiff base ligand is shown in the specification. According to the synthesis method, a solvent is not needed, the catalyst dosage is small, the reaction condition is mild, and meanwhile the olefin conversion rate and the target product selectivity are remarkably improved.

This invention discloses the application of Ru-based Schiff base metal COFs in the decomposition of formic acid to produce hydrogen, comprising the following steps: anhydrous formic acid is used as the reactant, and an alkali is added and mixed to obtain a reaction solution; under nitrogen or argon protection, Ru-based Schiff base metal COFs are added to the reaction solution as a heterogeneous catalyst, and a thermal reaction is carried out at 60-110℃, collecting the product gas; the large π bonds formed by the metal COFs endow the catalyst with overall electron-rich properties; more importantly, the ligands have large steric hindrance and structural rigidity, which can effectively protect the metal center, prevent its aggregation and deactivation, and extend the service life of the catalyst; the application of Ru-based Schiff base metal COFs in heterogeneous catalytic decomposition of formic acid to produce hydrogen exhibits superior catalytic performance and high catalytic conversion efficiency compared with existing heterogeneous catalysts for formic acid to produce hydrogen, and is also conducive to large-scale production.

The invention provides damp-heat-resistant flame-retardant polyurethane and a host-guest chemical preparation method thereof, hyperbranched polyethyleneimine reacts with aldehydes to obtain a Schiff base structure, and then an organic hydrogen phosphate compound reacts with the Schiff base structure to synthesize a phosphorus-containing hydrophobic shell-hydrophilic core hyperbranched polymer. A phosphate flame retardant is embedded in the obtained amphiphilic hyperbranched flame-retardant polymer to form a flame-retardant complex by utilizing a host-guest coated hydrophilic-hydrophobic interaction principle, and the complex is blended with polyurethane to obtain a modified polyurethane material. The modified polyurethane can effectively inhibit precipitation of phosphate flame retardants, so that the material has excellent flame retardance and humidity and heat resistance, and a flame-retardant complex of the flame-retardant polyurethane has good compatibility with the polyurethane, so that the material has good transparency.