20 results about "Aldimine" patented technology

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 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 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 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 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 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 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 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.

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 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.

The present invention is an aldimine-modified silicone represented by formula (1). (AR12SiO1 / 2) a (R12SiO2 / 2) b (R1SiO3 / 2) c (SiO4 / 2) d (1) (In the formula, A is an aldimine group represented by formula (2), R1 is independently a monovalent hydrocarbon group having 1-10 carbon atoms, a is 2 < = a < = 5, b is 0 < b < = 200, c is 0 < = c < = 1, and d is 0 < = d < = 1, but 2 < = a + b + c + d < = 200). -Q1-CH = N-R2 (2) (In the formula, Q1 is a divalent hydrocarbon group having 2-10 carbon atoms, and R2 is a monovalent hydrocarbon group having 1-10 carbon atoms) As a result, provided are: an aldimine-modified silicone resin composition in which a single component can be stored for a long period of time without chemically modifying a polyamine compound; and a method for producing the aldimine-modified silicone resin composition.

The invention relates to the technical field of epoxy hardeners, in particular to a water-based polyacrylic acid epoxy hardener and a preparation method thereof.The preparation method comprises the steps that small molecule aldehyde and diethylenetriamine are mixed to react, and aldimine-terminated modified amine A is obtained; reacting the aldimine-terminated modified amine A with epoxy resin to obtain epoxy modified amine B; reacting the epoxy modified amine B, a solvent, an acrylic monomer and an initiator to obtain acrylic modified amine C; mixing the acrylic acid modified amine C, acid and water for reaction to obtain acid neutralized hydrophilic modified amine D; and reacting the hydrophilic modified amine D neutralized by the acid with monoglycidyl ether to obtain the waterborne polyacrylic acid epoxy curing agent. An aldimine structure is introduced in the synthesis process, double bonds of acrylic acid are introduced through a reaction between secondary amine of aldimine and an epoxy group of GMA, then free radical chain extension is performed with an acrylic monomer in the presence of an initiator to obtain a supramolecular structure, and primary amine released by water reacts with epoxy to obtain the waterborne polyacrylic acid epoxy curing agent.

The application discloses a method for continuously synthesizing terpinolene. The method uses citral and amine R-NH2 as initial raw materials to perform a reaction to obtain a citral imine compound, which is subjected to a cyclization reaction under the catalysis of an acidic cation resin to obtain a cyclization product; the cyclization product and water are subjected to a hydrolysis reaction in a water-miscible organic solvent to obtain a cyclic citral; the cyclic citral is subjected to a condensation reaction with 2-pentanone, and finally subjected to a hydrogenation reaction to obtain terpinolene; and each step is continuously reacted in a continuous reaction device. The synthesis method can significantly reduce the degree of side reactions in each synthesis step, improve the selectivity and yield of the target product, and can realize continuous production and is suitable for industrial production.

The application relates to the technical field of anticorrosive coatings, in particular to a single-component high-permeability rust-bearing anticorrosive coating and a preparation method and application thereof. The single-component high-permeability rust-bearing anticorrosive coating is prepared from the following components in parts by weight: 30-50 parts of polyurethane prepolymer, 30-50 parts of wetting solvent, 10-30 parts of pigment and filler, 10-20 parts of water removal enhancer and 1.75-5 parts of auxiliary agent. The auxiliary agent comprises a dispersant, a thixotropic agent and a defoaming agent. The water removal enhancer is at least one of oxazolidine and aldimine. The curing time of the coating is accelerated, the drying time can be controlled to be less than 5 hours, the film integrity of the coating is improved, and the strength, wear resistance and hardness are improved by selecting and limiting the use amount of the water removal enhancer, selecting the polyol molecular weight of the polyurethane prepolymer and selecting the pigment and filler. The coating is more easily permeated into iron rust under the condition of spreading on the surface of the base material by limiting the type of the wetting solvent, so that the rust-bearing adhesion and anticorrosive performance of the coating are improved.

The subject of the present invention is a curable composition comprising at least one polymer containing isocyanate groups, at least one aldimine L having an aldimine group of formula (I), and at least one compound V having an activated methylene group of formula (II), wherein Y represents a group of formula (A), R represents a monovalent hydrocarbon group having 1 to 10 carbon atoms, R 1 represents an alkyl group having 1 to 6 carbon atoms, wherein the ratio of the number of aldimine groups of formula (I) to the number of isocyanate groups is at most 1 and the ratio of the number of activated methylene groups of formula (II) to the number of aldimine groups of formula (I) is at least 1, based on the entire composition. The composition is particularly suitable as an elastic adhesive or sealant. The composition reliably cures to an elastic polymer without bubble formation even without the action of moisture with readily available aldimines, wherein the use of aldimines derived from volatile aldehydes, such as benzaldehyde, does not result in odors. (A)

The invention provides a curable composition comprising at least one polyester polymer A having ketone ester groups of formula (I) and having an average functionality of at least 2 and an average equivalent weight of at least 400 g / eq, at least one compound B having ketone ester groups of formula (I) and having an equivalent weight of 114 to 250 g / eq, wherein R is a monovalent hydrocarbon group having 1 to 10 carbon atoms, and at least one aldimine L having aldimine groups of formula (II) and an aldimine equivalent weight of 110 to 350 g / eq, wherein Z is an aromatic or heteroaromatic five- or six-membered ring, which is optionally substituted and / or fused and comprises a total of 4 to 25 carbon atoms, wherein the weight ratio between compound B and polyester polymer A is 25 / 75 to 85 / 15, and wherein the ratio between the number of ketone ester groups of formula (I) and the number of aldimine groups of formula (II) is 2 to 3. The composition contains no toxic ingredients, is not moisture sensitive, and cures under ambient conditions without emissions and interfering odors, resulting in a viscoelastic polymer with high hardness, high tear propagation resistance, and good ductility. The composition is especially suitable as a viscoelastic adhesive, sealant, or coating.