137 results about "Formate Esters" patented technology

The invention relates to the technical field of organic synthesis, and particularly provides a thiophene-containing tetraarylethene compound as well as a preparation method and application thereof. According to the invention, two phenyl groups of tetraphenylethylene are replaced by methyl formate thiophene groups, and the substituted tetraarylethylene compound has more remarkable photochromic and mechanochromic dual functions through the interaction of a specific substituent group at the position 2 of thiophene and a large conjugated group formed by four aromatic rings; and light-operated double-color display in a polymer mechanism can be realized. The mechanochromism of the compound does not depend on ultraviolet light, when the compound is subjected to mechanical force, the molecular accumulation mode and conjugate planarity are changed, and the color change can be directly observed by naked eyes. Different from traditional tetraphenyl ethylene force-induced discoloration recessive fluorescence change, the dominant color change can be used in the fields of visual stress monitoring, anti-counterfeiting marks, inkless writing materials, safe ink and the like in ultraviolet-free environments (such as indoor and closed spaces), and the application prospect is wide.

The present invention provides a blowing agent for producing extruded polystyrene foam having low lambda over time and low foam density. [Solution] The foaming agent comprises (a) a first co-foaming agent consisting of (a) about 50% to about 70% by weight of HFO and / or HFCO having three or four carbon atoms, (b) about 2% to about 15% by weight of methyl formate, (c) a second co-foaming agent consisting of about 20% to about 30% by weight of dimethyl ether, isobutane and combinations thereof, and (d) a third co-foaming agent consisting of about 2% to about 25% by weight of carbon dioxide, acetone and combinations thereof.

The invention discloses (E)-1, 4-diether olefin and a preparation method thereof, and the (E)-1, 4-diether olefin is obtained by using 1, 3-diene as a raw material and carrying out electrochemical reaction in the presence of an electrolyte and a solvent, wherein the 1, 2, 4-trimethyl-1, 3- The structural formula of the 1, 3-diene is as follows: R1 is phenyl, p-fluorophenyl, p-chlorphenyl, p-bromophenyl, p-methylphenyl, p-methoxyphenyl, p-trifluoromethylphenyl, p-trifluoromethoxyphenyl, p-acetoxyphenyl, p-methyl formate phenyl, p-cyanophenyl, p-pinacol borate phenyl, p-phenylphenyl, o-oxybenzyl phenyl and o-methoxyphenyl; r1 is one of 1, 2-naphthyl; the solvent is a mixed solvent containing methanol. The preparation method of (E)-1, 4-diether olefin has high E-selectivity and 1, 4-selectivity, and an electro-catalysis mode is adopted, so that the use of a stoichiometric toxic, expensive or dangerous oxidant is avoided.

The present invention relates to an emulsion formulation comprising thiencarbazone-methyl or a pesticide-acceptable salt thereof, one or more organic water-immiscible solvents, one or more organic water-miscible solvents selected from linear and cyclic carbamate esters, one or more emulsifiers, and one or more organic bases, wherein the formulation exhibits a pH of 5.5 to 9.

A tung oil-based polyurethane epoxy toughening agent, its preparation method, and its application are disclosed. The chemical structure is shown below: R1 is a methyl tungate molecular chain, and R2 is a backbone molecule in diisocyanate. The preparation method involves reacting methyl tungate with diethanolamine to obtain diethanol tungamide; the diethanol tungamide is then reacted with diisocyanate and glycidyl ether to obtain an epoxy-terminated tung oil-based polyurethane epoxy toughening agent. This toughening agent can react with a curing agent, covalently integrating into the epoxy resin curing network, improving the compatibility between the toughening agent and the epoxy resin, and avoiding problems such as decreased material transparency due to phase separation. Furthermore, the structure contains amide, urethane, and conjugated triene structures, which can form sacrificial bonds such as hydrogen bonds and π-π interactions with the epoxy resin matrix. This can improve the toughness of the epoxy resin while mitigating the adverse effects of flexible long carbon chains on the strength and other properties of the epoxy resin.

The invention discloses a high-toughness regenerated plastic dropper material based on a waste mulching film and a preparation method of the high-toughness regenerated plastic dropper material, belongs to the technical field of material regeneration, and is used for solving the technical problem that the tensile property and the impact resistance of a regenerated plastic dropper material in the prior art need to be further improved. According to the invention, a silica ion reinforcing component, boric acid ester modified regenerated polyethylene and hydroxyl carbamate flexible polyurethane are synergistically compounded, and a multi-scale structure system in which an inorganic-organic hybrid constraint structure, a dynamic reversible connection unit and a flexible dissipation channel are combined is constructed in the material; the material forms a stable interface coupling and continuous stress transfer path in the melting processing and service stress process, so that the material gives consideration to structural bearing, morphology stability and energy distribution capability, and is suitable for plastic dropper products with comprehensive requirements on mechanical properties and heat resistance.

The invention relates to the technical field of dispergators, and discloses a dispergator and a preparation method and application thereof, the dispergator comprises the following components by mass: 50-100 parts of a penetrant, 50-100 parts of a swelling agent, 10-20 parts of a dispersant, 0.1-1 part of a surfactant A, 0.1-1 part of a surfactant B, and 1-5 parts of a catalyst; the penetrant is composed of methyl formate, ethanol, ethyl acetate, acetone and dichloromethane; the swelling agent is prepared from N-methyl pyrrolidone, dimethyl sulfoxide, tetrahydrofuran, N, N-dimethyl formamide, N, N-dimethyl acetamide, hexamethylphosphoric triamide and xylene. By compounding the penetrating agent, the swelling agent, the dispersing agent, the surfactant and the catalyst, the obtained dispergator can decompose an epoxy resin adhesive at a higher dispergation speed in the process of disassembling the retired battery pack.

The invention relates to the technical field of organic chemical synthesis, in particular to a catalyst and a process for preparing methyl glycolate and co-producing methyl formate through methanol dehydrogenation coupling oxalate hydrogenation, which comprises the following steps: S1) providing a coal-to-ethylene glycol device which comprises a methanol rectifying tower, a DMO synthesis system, a DMO refining system, a DMO hydrogenation reactor and a condensing system; s2) taking methanol extracted from a methanol rectifying tower as a raw material, and carrying out anaerobic dehydrogenation reaction under the action of the catalyst in any one of claims 1-2 or the catalyst prepared by the preparation method in claim 3 to obtain methyl formate, H2 and CO; and S3) by taking dimethyl oxalate extracted from a DMO refining system as a raw material, carrying out hydrogenation reaction under the action of the catalyst in any one of claims 4-5 or the catalyst prepared by the preparation method in claim 6 to obtain methyl glycolate and methanol.

The invention relates to the technical field of industrial methyl formate preparation, and particularly discloses carbon monoxide gas pretreatment and impurity removal equipment for industrial methyl formate preparation, the side face of a tower body is fixedly connected with a feeding component, the top of the tower body is fixedly connected with an exhaust port, the inner side of the tower body is fixedly connected with a spraying component, and the spraying component is fixedly connected with a gas outlet. The side face of the spraying part is fixedly connected with a water pipe. The carbon monoxide gas pretreatment and impurity removal equipment for industrial methyl formate preparation is provided with a contact mechanism, an arc-shaped contact plate is attached to the inner wall for cleaning, impurities are prevented from being attached and gathered on the tower body, the stable spraying and impurity removal efficiency is guaranteed, a second spring buffer structure can resolve overlarge extrusion force, the contact plate is prevented from rubbing the inner wall of the tower body, and the service life of the tower body is prolonged. The service life of equipment is prolonged, the cleaning range is complemented in the reset process of the triangular scraping plate, the blind area problem caused when a single contact plate moves downwards is solved, and inner wall cleaning under all working conditions is achieved.

This invention relates to a heteropolyacid catalyst for the condensation of formaldehyde and methyl formate to methyl glycolate, the preparation method of which includes the following steps: (1) loading the active component and (2) overflow hydrogen reduction. This invention uses common silica as a support and employs a co-impregnation method to load the active component to prepare the catalyst, under mild conditions and with a stable and controllable process. By doping with an appropriate amount of metal, overflow hydrogen is induced to reduce some coordinating atoms in the heteropolyacid as basic sites, which synergistically interact with the strongly acidic sites of the heteropolyacid to promote the cross-condensation of formaldehyde and methyl formate, thereby improving the reaction activity and selectivity. The prepared catalyst has advantages such as low reaction temperature, high activity, and good selectivity.

The invention discloses a rosin-based ionic liquid adhesive and a preparation method thereof, and belongs to the technical field of adhesive materials. According to the invention, a rosin derivative is adopted as a raw material and is converted into a high-performance adhesive through a series of amidation, carbamic acid esterification, quaternization and anion exchange reactions. The adhesive prepared by the invention shows strong and long-acting adhesion performance on various base materials (metal, wood, glass, ceramic and the like), and the maximum adhesion strength can reach 13.77 MPa. Based on the temperature sensitive characteristic, the adhesive can still keep stable reversible adhesion after being recycled for 10 times, and has excellent solvent resistance, moisture resistance and flame retardance. The rosin-based ionic liquid adhesive prepared by the invention not only has a wide application prospect in the fields of heterogeneous material connection, cultural relic repair and the like, but also provides a sustainable strategy for developing a high-performance bio-based adhesive.

The present application relates to the technical field of tail gas treatment of pesticide compound production, and particularly relates to a tail gas absorption system in cyanamide methyl formate production process, comprising: a tail gas collecting pipeline, a pretreatment unit, a deep purification unit and a detection device; wherein the pretreatment unit comprises a dust removal tower for cooling and dedusting the tail gas; the deep purification unit comprises an absorption tower made of stainless steel, PPH or glass steel, which is used for purifying the tail gas and treating toxic and harmful substances in the waste gas; the detection device is used for real-time monitoring of tail gas emission indexes to ensure standard emission. The technical scheme can quickly and effectively adsorb and purify the tail gas generated in the cyanamide methyl formate production process, has high adsorption performance, and also has large adsorption capacity and excellent selectivity.

The invention discloses a method for preparing polyoxymethylene dimethyl ether with low polymerization degree by using a water-containing formaldehyde system, and belongs to the technical field of methanol-based clean fuel and environment-friendly solvent preparation. According to the method, water-containing formaldehyde with the mass concentration of 55%-85% and methylal with the mass concentration of 92%-99% serve as raw materials, DMM2-4 is synthesized in a fixed bed reactor under the catalysis of strong acid cation exchange resin, after dimethyl ether and methyl formate by-products are removed from reaction products through flash evaporation, unreacted formaldehyde, methyl alcohol and formic acid are separated through multi-stage water extraction, and DMM2-4 is obtained. Returning the water phase to the methylal preparation unit for cyclic conversion; and carrying out multi-tower rectification and finishing on the organic phase to respectively obtain high-purity DMM2 and DMM3-4 products. Water is adopted as an extracting agent, organic pollution is avoided, the total utilization rate of formaldehyde is larger than or equal to 97%, the product purity reaches up to 98% or above, acidity is low, the product can be directly used as a diesel additive or an environment-friendly solvent, and the advantages of being low in raw material cost, environmentally friendly in process, high in product purity and the like are achieved.

The invention relates to a method comprising the extraction of at least one polyol from a polyol phase, wherein the polyol phase has been obtained through a recycling process (A) comprising an alcoholysis of a polyurethane product (A.1) and a workup of the chemolysis product obtained in the process, with separation of a carbamate phase from said chemolysis product (A.2), wherein the method comprises: reacting (α.1) the polyol phase with an aqueous hydrolysis reagent in the presence of a urethane preparation to obtain a product mixture comprising at least one polyol depleted of the at least one carbamate, and working up (α.2) the product mixture to extract the at least one polyol depleted of the at least one carbamate.

The invention discloses a method for synthesizing loxapine succinate, which comprises the following steps of: carrying out substitution reaction by using 2-nitrofluorobenzene and 2-hydroxy-4-chloromethyl benzoate as raw materials to generate 5-chloro-2-(2-nitrophenoxy) benzoate; nitryl is reduced, and 5-chloro-2-(2-aminophenoxy) benzoate is generated; the method comprises the following steps: carrying out an intramolecular ring closing reaction to generate 2-chlorodibenzo [b, f] [1, 4] oxazepine-11 (10H)-ketone; 2, 11-dichlorodibenzo [b, f] [1, 4] oxazepine is obtained through a reaction and chlorination; the method comprises the following steps: carrying out a C-N coupling reaction of methyl piperazine to generate 2-chloro-11-(4-methylpiperidine-1-yl) dibenzo [b, f] [1, 4] oxazepine; and salifying with succinic acid to generate the loxapine succinate. The method is easily available in raw materials, simple in process and suitable for large-scale production.

According to the method and system for preparing formic acid by catalyzing hydrolysis of methyl formate through the ionic liquid, in the system and method, the reversible reaction of hydrolysis of methyl formate can be prevented through the basic ionic liquid, hydrolysis of methyl formate into methyl alcohol and formic acid is promoted, and the conversion rate of methyl formate is increased; meanwhile, the re-esterification reaction of the hydrolysis product formic acid and methanol can be inhibited, so that the concentration of formic acid in the hydrolysis product is improved, the energy consumption during formic acid concentration is reduced, and more favorable conditions are provided for subsequent formic acid concentration. In addition, the alkaline ionic liquid can break azeotropy of formic acid and water so as to realize efficient hydrolysis and product separation. In addition, through reasonable backflow and cyclic utilization of materials among the towers, unnecessary multiple rectification separation is avoided, energy consumption is reduced, and production efficiency is improved.

The application belongs to the field of fine chemical industry, and proposes a synthetic route for preparing aromatic diamine from anisyl alcohol through esterification, carbon-carbon (C-C) coupling, nitration and reduction process. In the route, anisyl alcohol is first subjected to esterification reaction to obtain anisyl formate, the formate intermediate is further catalytically converted into a dimer, then the dimer is subjected to nitration to obtain an aromatic dinitro compound, and the nitration product is finally subjected to reduction to obtain the aromatic diamine. The route has high carbon yield and economic value.

The invention relates to the technical field of environmental analysis and detection, and particularly discloses a preparation method and application of a filter paper strip for rapidly detecting NO2 <-> in wastewater. The method comprises the following steps: firstly, synthesizing a specific fluorescent probe (DAE, 2, 5-diamino-3-(4-(diethylamino)-2-hydroxybenzylidene) cyclohex-1, 5-diene-1, 4-diformate) with a double amino recognition site through a'one-pot method '; then, dissolving the probe DAE in a small amount of acetonitrile (CAN), and mixing with a phosphate buffer solution (PBS) to prepare a probe solution (DAE-ACN-PBS with the pH value of 5 and the weight ratio of 0.01: 6: 4); and finally, immersing the filter paper strip in a DAE-ACN-PBS solution for 15 minutes, washing with PBS, and naturally airing to obtain the filter paper strip for testing NO2 <->. The filter paper strip is used for testing NO2 <-> in the wastewater to verify the actual effect.

The present invention provides a supramolecular hot melt adhesive. The present application also provides a method for preparing a supramolecular hot melt adhesive, comprising the steps of: A) dissolving a diol oligomer or diamine oligomer in a solvent, and reacting the mixture with diisocyanate under the action of a catalyst to obtain an initial reactant; B) mixing 2-amino-4-hydroxyl-6-methylpyrimidine, the initial reactant and a solvent for reaction; C) reacting the reactant obtained in step B) with a multifunctional crosslinking agent to obtain the supramolecular hot melt adhesive. The preparation method of the present invention constructs a supramolecular material with excellent strength, toughness and self-healing ability by a synergistic effect of multiple hydrogen bonds between carbamate or ureido group and pyrimidine group. The effective control of performance of materials can be realized by changing the chemical composition of supramolecular arms, the content of single-capping agent and the functionality of cross-linking agent.

The invention relates to the field of high-barrier PET composite materials, in particular to a high-barrier PET composite material as well as a preparation method and application thereof. The high-barrier PET composite material is prepared from the following raw materials in parts by mass: 80 to 90 parts of polyethylene glycol terephthalate, 6 to 8 parts of mushroom nano chitin compound, 1 to 2 parts of chain extender and 1 to 2 parts of antioxidant. According to the preparation method, mushroom nano chitin (ChNF) is utilized, surface modification is carried out through 3, 4-dihydro-2H-1, 4-benzoxazine-7-methyl formate (BZ-M), and nano diamond is anchored on the surface of ChNF in situ; and in the subsequent melt blending process, micro-crosslinking with a PET molecular chain is continued, so that the multiple barrier properties of oxygen barrier property, water vapor barrier property, ultraviolet barrier property and bacteria barrier property of the PET composite material are improved under the condition that the mechanical property and light transmittance are maintained.

The present application relates to a kind of aryl carboxylate compounds and its preparation method, preparation method includes the following steps: S1, under inert atmosphere, chloroformate or its derivative, aryl iodine, ligand, reducing agent, additive and catalyst are dissolved in solvent, obtain the reaction body solution;S2, the reaction body solution obtained in S1 step is stirred, obtain the aryl carboxylate compound of structural general formula as shown in III, wherein, R 1 Group is selected from H, 4-trifluoromethyl, 4-methoxy, 4-methyl formate in any one of methyl group, R 2 It is selected from 4-trifluoromethyl, 4-acetyl, 4-methyl formate in any one of methyl group.Compared with prior art, the present application uses chloroformate or its derivative, aryl iodine as substrate, aryl carboxylate compound is prepared, reaction condition is mild and substrate is widely adaptable, yield is as high as 80%.And raw material cost is low and easy to obtain, preparation condition is simple and also easy to realize.

The invention relates to the technical field of chemical manufacturing equipment, and particularly discloses a raw material gas impurity purification process and equipment for methyl formate preparation, the raw material gas impurity purification equipment comprises a bearing frame, and also comprises a purification mechanism fixedly mounted at the top of the bearing frame; and the reinforcing mechanism is fixedly mounted in the purification mechanism. According to the raw material gas impurity purification process and equipment for preparing methyl formate, the top cavity of the purification pipe is in a high-pressure and negative-pressure state continuously, namely, the filter cloth is stirred up and down continuously, so that filtered impurities are difficult to stay on the surface of the filter cloth for a long time, the filtering efficiency of raw material gas is greatly improved, and the service life of the raw material gas is prolonged. The problem that the filtering speed is quickly reduced due to the fact that the filter cloth is always extruded and swelled towards one side of the air outlet pipe and filtered impurities on the surface are difficult to clean when feed gas is output through an air pump in the prior art is avoided, the service life of the equipment is greatly prolonged, and the later maintenance frequency is reduced.

A purpose of the present invention is to provide a novel heat resistant composition that imparts heat resistance to various materials and therefore can be suitably used particularly for improving the heat resistance of resin materials. Another purpose of the present invention is to provide a heat resistance improvement agent and a resin composition which comprise the heat resistant composition. The present invention is a composition which is used for imparting heat resistance, said composition comprising a trehalose derivative. The trehalose derivative is preferably one or more substances selected from the group consisting of trehalose benzoate, trehalose octaacetate, trehalose naphthoate, and trehalose fatty acid esters.

The invention discloses a copper / zinc-silicon dioxide catalyst as well as a preparation method and application thereof. The preparation method comprises the following steps: by taking SiO2 as a carrier, firstly, introducing high-dispersion Zn by adopting a hydrothermal-deposition method to obtain a Zn-SiO2 carrier; and loading Cu on the carrier in a high-dispersion manner by using an ammonia water assisted deposition-precipitation method to prepare the Cu / Zn-SiO2 catalyst. Cu and Zn exist in an atomic-scale high-dispersion form, and no metal or oxide nano-particles exist. According to the catalyst, under the conditions of 230 DEG C, normal pressure and no carrier gas, the methanol conversion rate is 45%, the methyl formate selectivity is larger than or equal to 90%, and the catalyst can stably run for 100 h; after inactivation, complete regeneration can be realized through air roasting and H2 / N2 reduction. The minimum apparent activation energy of the catalyst provided by the invention is 33.9 kJ mol <-1 >, the activity, selectivity and regeneration performance of the catalyst are obviously superior to those of the existing copper-based catalyst, and the catalyst has a good industrial application prospect.

Provided are: a stabilizer capable of improving the stability of a compound having a sulfide group directly bonded to an aromatic ring or a heterocyclic ring having a molecular weight of 1,000 or less; a composition containing this stabilizer and a compound having the sulfide group; an organic material and / or inorganic material composition containing this composition; and a method for improving the stability of the compound having the sulfide group.　The stabilizer is used for a compound having a sulfide group directly bonded to an aromatic ring or a heterocyclic ring having a molecular weight of 1,000 or less, the stabilizer including at least one stabilizer A selected from phenol-based compounds, aromatic amine-based compounds, sulfur-containing fatty acid-based compounds, phosphite ester-based compounds, phosphine-based compounds, carbamate-based compounds, and benzimidazole-based compounds.

The invention relates to the technical field of coatings, and discloses a preparation method of an EVA (Ethylene Vinyl Acetate) waterproof coating, which comprises the following steps: reacting activated montmorillonite with toluene diisocynate to obtain isocyanate modified montmorillonite; eVA is hydrolyzed under the catalysis of potassium hydroxide to obtain hydroxylated EVA; and reacting the epoxy trisiloxane intermediate with terephthalic acid under ring-opening esterification of benzyltriethylammonium chloride to obtain the p-hydroxytrisiloxane benzoate. 4-hydroxytrisiloxane benzoate, hydroxylated EVA and isocyanate modified montmorillonite are subjected to a cross-linking reaction with toluene diisocynate under the catalysis of stannous octoate, then a defoaming agent and a dispersing agent are added into the mixture, the mixture is stirred to be uniform, and the EVA waterproof coating is obtained. The EVA waterproof coating prepared by the preparation method disclosed by the invention has relatively good mechanical property and waterproof property.

The invention provides a multi-component supported catalyst as well as a preparation method and application thereof, and belongs to the technical field of catalysts. The invention provides a multi-component supported catalyst which comprises main active metal, a cocatalyst component and an oxide carrier, the main active metal comprises Cu and Ag, the cocatalyst component comprises one or more of Cs, Y, Ga, In, Zn and Ni, and the oxide carrier comprises SiO2. By adding the cocatalyst component and Ag, the interaction between Cu and the oxide carrier is enhanced to promote dispersion of Cu, so that the catalytic activity is improved, and the conversion rate of methanol is increased. Data of the embodiment shows that the multi-component supported catalyst can be applied to a reaction for preparing methyl formate through methanol coupling and producing high-purity hydrogen as a byproduct under the continuous carrier-gas-free condition of a fixed bed, shows excellent catalytic activity and high selectivity, has a long service life and has a good industrial application prospect.

This invention belongs to the field of wastewater treatment technology, specifically relating to a method for degrading phthalic acid ester pollutants using photo-activated periodate. The method involves adding periodate to the reaction system and applying light irradiation. Under light, periodate continuously generates various free radicals, which can attack phthalic acid esters, achieving efficient degradation. Compared with existing advanced oxidation technologies, this invention does not require high-energy ultraviolet light sources or additional catalysts. The reaction conditions are mild, energy consumption is low, and the process is simple. It is suitable for the removal of phthalic acid ester pollutants from industrial wastewater, domestic sewage, and surface water, and has promising engineering application prospects.

The application discloses application of an environment-friendly peroxide cyclohexanone curing agent composition in high-iron putty and belongs to the technical field of paints. Esterification materials are obtained through esterification reaction among castor oil acid, terephthalic acid and isooctanol; carbon-carbon double bonds on the molecular chain of the esterification materials are subjected to epoxidation modification to obtain epoxidized esterification materials; and dehydrogenated rosin acid and the epoxidized esterification materials are subjected to ring-opening reaction to synthesize a new desensitizing agent to replace a toxic phthalate desensitizing agent, thereby avoiding use of phthalate compounds, and ensuring that products meet the environmental protection regulations of the European Union. When the curing agent composition is used in cooperation with polyester resin, not only good desensitizing effect can be achieved, but also the putty after curing has excellent physical properties and chemical stability, and thus a powerful guarantee is provided for production and application of high-iron putty.