40 results about "Aldimine" patented technology

The invention provides a cationic waterborne epoxy hardener without containing free amine and a preparation method thereof, and relates to the technical field of epoxy hardeners, the method comprises the following steps: 1) mixing small molecular aldehyde and hydroxyethyl diethylenetriamine for reaction to obtain oxazolidine and aldimine terminated modified amine; (2) carrying out reaction on the modified amine and polyfunctional epoxy resin to obtain modified oxazolidine and aldimine-terminated modified resin amine; 3) mixing the modified oxazolidine and aldimine terminated modified resin amine, monofunctional glycidyl ether and water for reaction to obtain terminated modified resin amine; and 4) adding small molecular acid to neutralize the terminated modified amine, and transferring water to obtain the cationic waterborne epoxy curing agent without free amine. The paint film can be endowed with excellent boiling water resistance, acid and alkali resistance, neutral salt mist resistance and the like, the preparation process is simple, the production cost is low, and the paint is suitable for large-scale industrial application.

This invention discloses a method for preparing vicinal diamine derivatives, belonging to the field of pharmaceutical intermediates and organic synthesis technology. Specifically, under an inert atmosphere, an aldehyde imine, an N-aryl tertiary amine, a base, a cadmium selenide quantum dot catalyst, and a solvent are mixed and reacted under blue light irradiation for 8-24 hours. After extraction with ethyl acetate and saturated brine, the organic phase is collected, dried, the solvent is removed by vacuum distillation, and purified by column chromatography to obtain the vicinal diamine derivatives. The vicinal diamine derivatives synthesized by this invention can be used as synthetic intermediates and metal ion chelating agents in drug synthesis and fine chemical industries.

The invention provides preparation and application of a 4-(trifluoromethyl)-pyridine dialdimine ligand and an iron complex of the 4-(trifluoromethyl)-pyridine dialdimine ligand, and belongs to the technical field of catalysts. The novel 4-(trifluoromethyl)-pyridine dialdimine ligand provided by the invention can form a complex with iron to be used as a high-efficiency catalyst for a methyl zincing reaction, compared with a traditional metal catalyst, the ligand has higher catalytic performance, and the ligand has the following structural formula: an iron complex with the following structural formula: (1)-(1)-(2-(4-trifluoromethyl)-pyridine dialdimine)-(1-(4-trifluoromethyl)-pyridine dialdimine)-(1-(4-trifluoromethyl)-pyridine dialdimine).

This invention relates to a method for preparing a β-cyclodextrin functionalized covalent organic framework composite material. The method involves an aldehyde-imine condensation reaction between the aldehyde groups on 2,3,4-trihydroxybenzaldehyde and p-phthalaldehyde and the amino group on hepta(6-amino-6-deoxy)betacyclodextrin to construct a β-CD-COF layer. This one-step method produces a β-cyclodextrin covalent organic framework composite material that exhibits excellent enrichment capacity for phosphopeptides, facilitating purification and extraction. It also shows promising application prospects in mass spectrometry detection and exosome separation.

The invention relates to a wind turbine blade, preferably the leading edge of a wind turbine blade, coated with a coating composition comprising: (A) at least one polyaspartic selected from the group consisting of polyaspartic esters, polyetheraspartic esters and mixtures thereof; and (B) at least one aliphatic polyisocyanate prepolymer curing agent; wherein the component A further comprises a cycloaliphatic diamine aldimine.

The invention relates to a curable composition comprising: at least one polyether polymer A with ketoester groups of formula (I) or aldimine groups of formula (II), having an average functionality of 1.7 to 3.0 and an average equivalent weight of at least 500 g / eq; at least one compound B with ketoester groups of formula (I) and an equivalent weight of 114 to 250 g / eq; and at least one aldimine L with aldimine groups of formula (II) and an aldimine equivalent weight of 110 to 350 g / eq, the ratio between the number of ketoester groups of formula (I) and the number of aldimine groups of formula (II) being between 2 and 3. The composition is free from toxic ingredients, not sensitive to moisture, and cures under ambient conditions without emissions and unpleasant odours to form an elastic polymer with high extensibility and surprisingly high tear resistance. The composition is particularly suitable as an elastic adhesive, sealant, or coating.

The invention relates to the technical field of photocatalytic materials, in particular to a Si-COF photocatalyst as well as a preparation method and application thereof. The preparation method comprises the following steps: taking 2, 5-diamino-1, 4-benzene dithiol dihydrochloride and tetra (4-formylphenyl) silane as raw materials, carrying out aldimine condensation reaction, and carrying out condensation on amino and sulfydryl of the 2, 5-diamino-1, 4-benzene dithiol dihydrochloride and aromatic aldehyde of the tetra (4-formylphenyl) silane to form benzobithiazole structural sites, so as to obtain the Si-COF photocatalyst. The photocatalyst has very strong self-assembly ability and can produce H2O2 without a sacrificial agent, when the dosage of the photocatalyst is 5 mg, the yield of H2O2 reaches up to 6059.86 [mu] mol.g <-1 >. H <-1 > / 100 mmol.L <-1 >, the operation is simple and convenient, the condition is mild, and the photocatalyst is suitable for green and efficient production of H2O2.

The invention relates to a curable composition comprising at least one polymer having end groups of formula (I) containing an aromatic aldimine group and an average molecular weight Mn of 1,000 to 30,000 g / mol, and at least one compound having two or more 1,3-ketoester groups of formula (II). The curable composition is not sensitive to moisture, cures quickly and reliably at room temperature when the components are mixed and enables surprisingly high extensibility and surprisingly high tear propagation resistance at high strength and good stability against heat and hydrolysis.

The invention provides a resin composition and a preparation method and application thereof.The resin composition comprises epoxidized rubber, a styrene thermoplastic elastomer and a curing agent, the curing agent comprises one or more of a ketimine curing agent and an aldimine curing agent, the resin composition has insulativity, and when the resin composition is suitable for a glass base material or a polyimide base material, the resin composition can be used for curing a glass substrate or a polyimide substrate. Good water resistance and moisture resistance are realized.

The invention provides a two-component polyurethane waterproof coating and a preparation method and application thereof, the two-component polyurethane waterproof coating comprises a first component and a second component, the first component comprises a polyurethane prepolymer and a latent curing agent; the second component comprises a first plasticizer, a functional aid, a solid filler and a first organic solvent, the polyurethane prepolymer is obtained by polymerization reaction of polyether glycol, polyether triol and isocyanate, and the latent curing agent comprises any one of an aldimine curing agent and an oxazolidine curing agent.

The present invention is an aldimine-modified silicone represented by formula (1). Formula (1): (AR1 2SiO1 / 2)a(R1 2SiO2 / 2)b(R1SiO3 / 2)c(SiO4 / 2)d (In this formula, A is an aldimine group represented by formula (2), each R1 is independently a C1-10 monovalent hydrocarbon group, a satisfies 2 ≤ a ≤ 5, b satisfies 0 < b ≤ 200, c satisfies 0 ≤ c ≤ 1, d satisfies 0 ≤ d ≤ 1, and 2 ≤ a + b + c + d ≤ 200 is satisfied.)　Formula (2): -Q1-CH=N-R2 (In this formula, Q1 is a C2-10 divalent hydrocarbon group, and R2 is a C1-10 monovalent hydrocarbon group.)　In view of the above, provided are an aldimine-modified silicone and a method for producing said aldimine-modified silicone which make long-term single-liquid storage of a silicone resin composition possible without chemically modifying a polyamine compound.

The invention provides a high-initial-strength heat-conducting polyurethane adhesive with a thick adhesive layer, which is characterized in that an adhesion accelerant is prepared by taking alkyl acrylate, glycidyl acrylate, acrylonitrile and styrene as reaction monomers and phosphate as an end-capping reagent; the heat-conducting polyurethane adhesive is matched with latent curing agents such as aldimine and the like to be applied to a heat-conducting polyurethane adhesive requiring a thick adhesive layer, so that the defect that bubbles are generated due to water vapor and the like in the curing process is effectively avoided, and high initial strength and relatively rapid strength improvement are provided. The heat-conducting polyurethane adhesive prepared by the invention is suitable for occasions with relatively high heat conductivity, heat dissipation, adhesion, sealing and the like, such as new energy power batteries, electrical components, electric control components and the like, and provides excellent mechanical properties and good heat-conducting property.

The invention discloses a chemical modification method for irreversible aldehyde amine condensation coupling reaction based on aromatic ring triazole formaldehyde and application of the chemical modification method, and belongs to the technical field of chemical pharmacy and biology. Aromatic ring triazole formaldehyde with a novel structure is adopted in the condensation coupling reaction, the aromatic ring triazole formaldehyde can react with various molecules containing primary amino groups in a broad spectrum mode, the reaction is efficient, high in selectivity, environmentally friendly and completely biocompatible, and the formed 1, 2, 3-triazole product is stable. The reaction is successfully applied to primary amine modification of biological macromolecules such as drug molecules, polypeptides, proteins, antibodies, DNA and the like, and has great commercial value.

The application discloses a method for catalytically synthesizing gamma-lactam derivatives by using organic phosphine, which uses oxetanone-derived MBH carbonate and aromatic aldehyde imine as raw materials, chloroform as a solvent, 4A molecular sieve and R 1 OH as additives, and is heated to 60 o C under the action of L-valine-derived organic phosphine catalyst to synthesize a target product in one step. The synthesis method is simple in operation, and raw materials and catalysts are simple and easy to obtain; the reaction time is short; the reaction substrate is suitable for a wide range; the target product has a high yield; the gamma-lactam can be asymmetrically synthesized; even a spiro ring structure can be introduced; and the industrial production prospect is wide.

The present disclosure provides an intumescent coating composition comprising: (a) a molecule comprising one or more acyl acyloxy groups; (b) an epoxy resin; (c) a molecule comprising a ketimine and / or aldimine group; and (d) a swelling agent. The intumescent coating composition may have a surface dry time (ASTM-D1640-2014) of less than 200 minutes at 23 DEG C and 40% relative humidity.

This invention provides a free amine-free nonionic waterborne epoxy curing agent and its preparation method, relating to the field of epoxy curing agent technology. The method includes the following steps: 1) mixing and reacting a small molecule aldehyde and hydroxyethyldiethylenetriamine to obtain an oxazolidine- and aldolimide-terminated modified amine; 2) reacting the modified amine and polyether amine-modified multifunctional epoxy resin to obtain a hydrophilic oxazolidine- and aldolimide-terminated modified resin amine; 3) mixing and reacting the hydrophilic oxazolidine- and aldolimide-terminated modified resin amine, a monofunctional glycidyl ether, and water to obtain the free amine-free nonionic waterborne epoxy curing agent. The nonionic waterborne epoxy curing agent of this invention, when combined with a waterborne epoxy emulsion to form a film, can impart excellent resistance to boiling water, acids and alkalis, and neutral salt spray, etc., and the preparation process is simple and the production cost is low, making it suitable for large-scale industrial applications.

The application provides a process method and an ion processing machine for heparin surface treatment of artificial lenses, effectively solves the problem of lacking technical breakthrough of heparin surface treatment of artificial lenses, and comprises the following steps: placing the dried artificial lenses into an ion processing machine for surface ion processing, which is used for cleaning the surface and generating active free radicals; soaking the artificial lenses with the generated active free radicals after ion processing in a grafting solution containing aldimine or ketimine groups to obtain artificial lenses containing aldimine or ketimine groups through reaction, the soaking time of the artificial lenses with the generated active free radicals in the grafting solution containing aldimine or ketimine groups is 0.1h-78h; soaking the artificial lenses containing imine groups in an aldehyde-based heparin solution; and the soaking time of the artificial lenses with aldimine or ketimine groups in the aldehyde-based heparin is 0.1h-78h. The application provides a specific process method for heparin surface treatment of artificial lenses, and realizes the technical breakthrough of surface heparin treatment.

The invention belongs to the field of sewage treatment, and particularly relates to an acrylonitrile production wastewater treatment process. Comprising the following steps: preparing a nickel catalyst by using a salicylaldehyde imine ligand and nickel salt; then loading a nickel catalyst on the magnetic carrier to obtain a magnetic catalyst; removing dissolved oxygen in the wastewater, treating the wastewater by adopting a magnetic catalyst, and promoting monomer polymerization in the wastewater; and the magnetic catalyst is separated in a magnetic suction separation manner. The process disclosed by the invention can promote olefin polymerization and sedimentation and reduce the activity and toxicity of the wastewater, is simple to operate and does not need special equipment.

The preparation method comprises the following steps: firstly, synthesizing to obtain planar chiral camphor-based phosphonite, then taking the camphor-based phosphonite as a chiral induction reagent, taking aldehyde, aldimine and nitroolefin as substrates, and carrying out asymmetric Pudovik reaction at the temperature of 80 DEG C below zero to 0 DEG C under the action of an alkaline additive, so as to obtain the chiral compound of the camphor-based phosphonite. A series of chiral alpha-hydroxyl, alpha-amino and beta-nitro phosphine ester compounds are synthesized with high yield and excellent stereoselectivity. Compared with the prior art, the synthesis method disclosed by the invention is a chiral induction method, and is green, efficient and mild in condition; the reaction system is simple and convenient to operate; the yield is high, and the substrate application range is wide. Alpha-hydroxyl, alpha-amino and beta-nitrophosphonate efficiently synthesized by the method are important skeletons of many medicines and bioactive molecules, and a widely applicable preparation method is provided for synthesizing the compounds.

The invention relates to a method of forming an epoxy resin curative, derived from a polyamine, and having exceptionally high purity with regard to contamination with said polyamine precursor. The invention also provides high purity epoxy resin curatives, epoxy resin curative compositions comprising said epoxy resin curatives, and uses of the same. In one aspect, the invention provides a method of forming an epoxy resin curative, by contacting a difunctional epoxide compound with one or more polyamine, to provide a diadduct, purifying the diadduct such that the purified diadduct comprises less than 0.1 wt. % of the one or more polyamine, as determined by GC, and using the diadduct to form a Mannich base, amide containing compound, ketimine, or aldimine, for use as an epoxy resin curative.

A moisture-curable composition, including: a) at least one polyurethane polymer P having isocyanate groups; b) at least one blocked polyamine BA having blocked, hydrolytically activatable amino groups; and c) at least one monoamine MA of formula (V),where Ra represents a linear, cyclic, or branched alkyl or alkenyl radical or optionally substituted aryl radical with 1 to 12 C atoms and optionally including ether oxygen atoms; Rb and Rc either independently represent a rest Ra or a hydrogen atom, where at least one of Rb and Rc is a hydrogen atom, or Rb and Rc together with the N atom of monoamine MA form an aldimine group that under influence of water hydrolyzes to a aldehyde and an amine Ra—NH2; wherein polymer P is the reaction product of 2,4- and / or 2,6-toluylene diisocyanate (TDI) and at least one polyol, wherein the polyol has an average functionality of >2.

The invention relates to a curable composition comprising at least one polyester polymer A having ketoester groups of the formula (I) with an average functionality of at least 2 and an average equivalent weight of at least 400 g / eq, at least one compound B having ketoester groups of the formula (I) and an equivalent weight of 114 to 250 g / eq and at least one aldimine L having aldimine groups of the formula (II) and an aldimine equivalent weight of 110 to 350 g / eq, wherein the weight ratio between compounds B and polyester polymers A is 25 / 75 to 85 / 15, and wherein the ratio between the number of ketoester groups of the formula (I) and the number of aldimine groups of the formula (II) is 2 to 3.The composition is free of toxic ingredients, is not sensitive to moisture, and cures under ambient conditions without emissions or unpleasant odors to form a tough, elastic polymer with high hardness, high tear resistance, and good extensibility. The composition is particularly suitable as a tough, elastic adhesive, sealant, or coating.

The invention provides a polyurea-based modified high-thixotropy waterborne epoxy hardener and a preparation method thereof, and relates to the technical field of epoxy hardeners, the method comprises the following steps: 1) mixing small molecular aldehyde and diethylenetriamine for reaction to obtain aldimine-terminated modified amine; (2) carrying out reaction on the aldimine-terminated modified amine, polyfunctional isocyanate diluted by a solvent and amino-terminated methoxy polyether, so as to obtain hydrophilic modified aldimine-terminated polyurea-based modified resin amine; and 3) mixing the hydrophilic modified aldimine-terminated polyurea-based modified resin amine, the epoxy resin mixture and water for reaction to obtain the polyurea-based modified high-thixotropy waterborne epoxy curing agent. The carbamido modified waterborne epoxy curing agent and waterborne epoxy emulsion are compounded to form a film, so that a paint film can be endowed with excellent anti-sagging performance, the preparation process is simple, the production cost is low, and the carbamido modified waterborne epoxy curing agent is suitable for large-scale industrial application.

The application relates to the technical field of compound synthesis, and discloses an electron-deficient aromatic aldehyde imine compound, which is obtained by uniformly mixing an electron-deficient aromatic aldehyde compound or a heterocyclic compound with an amine compound and then performing a dehydration condensation reaction under heating conditions, the electron-deficient aromatic aldehyde compound, the heterocyclic compound and the amine compound are all chemical raw materials with wide sources, the reaction process is a one-pot reaction, the whole process is one-time feeding, and the separation step can be realized in the reaction process to obtain the final product, the reaction is convenient and efficient; and the application discloses application of the electron-deficient aromatic aldehyde imine compound in a polyurethane material system or a polyurea coating, the curing time is faster than that of a conventional latent curing agent, the efficiency is higher, the irritating odor of the conventional latent curing agent can be effectively eliminated, the application has important significance for improving a construction environment, conforms to the green environmental protection concept, and meets the needs of market and industry development.

The application provides a polyurea-based modified high-thixotropy waterborne epoxy curing agent and a preparation method thereof, relates to the technical field of epoxy curing agents, and comprises the following steps: 1) mixing a small molecule aldehyde and diethylenetriamine to perform a reaction, so as to obtain an aldehyde imine-terminated modified amine; 2) performing a reaction on the aldehyde imine-terminated modified amine, a solvent-diluted multifunctional isocyanate and an amino group-terminated methoxy polyether, so as to obtain a hydrophilic modified aldehyde imine-terminated polyurea-based modified resin amine; and 3) mixing the hydrophilic modified aldehyde imine-terminated polyurea-based modified resin amine, an epoxy resin mixture and water to perform a reaction, so as to obtain the polyurea-based modified high-thixotropy waterborne epoxy curing agent. The urea-based modified waterborne epoxy curing agent can endow a paint film with excellent sag resistance when being compounded with a waterborne epoxy emulsion to form a film, the preparation process is simple, the production cost is low, and the application is suitable for large-scale industrialization.

A method of forming an epoxy resin curative comprising the following steps; (i) a difunctional epoxide is reacted with a polyamine possessing at least two active hydrogens, at a ratio of 1:2 to form a diadduct (ii) the diadduct is distilled to purify it by removing any excess polyamine (iii) the purified diadduct is further reacted with either (a) an aldehyde, preferably formaldehyde, and an optionally substituted phenolic compound to form a phenolic Mannich base or (b) one or more fatty acids, preferably tall oil fatty acid (TOFA) to form an amide and amine-containing compound or (c) one or more ketone, preferably methyl isobutyl ketone (MIBK) and / or aldehydes to form a ketimine and / or aldimine-containing compound. The products of step (iii) can be used as epoxy resin curatives. Preferably, the difunctional epoxide is bisphenol diglycidyl ether, more preferably bisphenol A diglycidyl ether, and the polyamine is ethylene diamine (EDA) or tetraethylene pentaamine (TEPA).

The utility model relates to the technical field of curing agent production, and discloses an aldimine latent curing agent material conveying device which comprises a bottom plate, the left side of the top of the bottom plate is fixedly connected with a storage tank, the middle side of the top of the bottom plate is provided with a filtering assembly, and the right side of the top of the bottom plate is fixedly connected with a conveying tank. A draw-off pump is fixedly connected to the edge of the top of the bottom plate, a stirring assembly is arranged in the storage tank and comprises a shell, the shell is fixedly connected to the top of the storage tank, an impeller is rotatably connected to the interior of the shell, a rotating shaft is fixedly connected to the bottom of the impeller, and a plurality of stirring rods are fixedly connected to the outer wall of the rotating shaft; scraping assemblies are installed among the multiple stirring rods on the same side. According to the stirring device, the stirring assembly drives the rotating shaft and the stirring rod to rotate through the impeller, materials in the storage tank are continuously stirred, the aldimine latent curing agent materials are effectively prevented from being precipitated and layered in the storage process, and the uniformity of the materials is maintained.

The invention relates to the technical field of catalyst preparation, in particular to a benzobithiazolyl three-dimensional COF catalyst, a preparation method thereof and application of the benzobithiazolyl three-dimensional COF catalyst in photocatalytic production of H2O2. 2, 5-diamino-1, 4-benzene dithiol dihydrochloride and N, N-dimethylformamide are subjected to ultrasonic mixing, and a mixed solution is obtained; adding tetra (4-formyl phenyl) methane and glacial acetic acid into the mixed solution, uniformly mixing, carrying out oil bath reaction, cooling to room temperature after the reaction is finished, washing and drying to obtain the benzobithiazolyl three-dimensional COF catalyst. And under the driving of aromatization, spontaneous oxidative dehydrogenation is carried out to synthesize the benzobisthiazolyl three-dimensional COF catalyst, and water and air can be efficiently utilized to produce H2O2 under the photocatalytic condition.

The application discloses a preparation method of a trans-4,5-di-substituted oxazolidinone compound, a [4+1] cyclization reaction of an aldimine and an oxysulfur ylide catalyzed by an iron salt, a product configuration is trans, and the product has high diastereoselectivity (d.r.>20:1). The application provides a new synthesis route of the trans-4,5-di-substituted oxazolidinone compound, which has the advantages of high efficiency, relatively mild reaction conditions, cheap and easily obtained raw materials, wide substrate application range, excellent functional group tolerance, high atom and step economy and the like, and has a potential application prospect in the field of drug synthesis.

The invention discloses a single-component polyurethane-epoxy hybrid structural adhesive and a preparation method thereof, and belongs to the technical field of high-molecular elastic adhesives, the single-component polyurethane-epoxy hybrid structural adhesive comprises the following raw materials by mass: 20-40 wt% of a polyurethane prepolymer, 5-10 wt% of epoxy resin, 10-20 wt% of a plasticizer, and 3-6 wt% of reinforcing carbon black; a proper amount of epoxy resin is introduced into a traditional single-component polyurethane adhesive system, a latent curing agent moisture absorption hydrolysis product containing an aldimine structure contains two or more aliphatic primary amino groups, and the groups can be subjected to a rapid chemical reaction with NCO in a prepolymer and can also be subjected to a ring-opening reaction on epoxy groups under the room temperature condition, so that the high-performance polyurethane adhesive is obtained. Therefore, room-temperature curing of a single-component hybrid system is realized. The epoxy resin and the polyurethane prepolymer are co-crosslinked to form a hybrid chemical cross-linked network, and compared with traditional moisture curing single-component polyurethane, bubbles caused by too fast reaction of NCO and water molecules can be overcome, and the body strength and the bonding performance can be synchronously improved.