326 results about "Formic anhydride" patented technology

The invention discloses a preparation method of butylphthalide, which comprises the following steps: taking phthalic anhydride as a raw material; enabling the phthalic anhydride to carry out addition reaction with the Grignard reagent of butyl halide to obtain an intermediate of o-valeryl benzoic acid; and then, reducing by sodium borohydride, and carrying out acidic cyclization to obtain the butylphthalide. The phthalic anhydride and the butyl halide which are used as raw materials in the preparation method of the butylphthalide of the invention are commercial products, and the reaction raw materials can be obtained easily. Because the Grignard reaction, the sodium borohydride reduction and the acidic cyclization are classical reactions, the operation is simple, the industrialized production can be realized easily, the yield of the butylphthalide reaches 50-60%, and the purity of the butylphthalide reaches 97-98%.

The present invention discloses water treating agent containing methoxy naphthalene as fluorescent marker. The water treating agent is prepared through the first reaction of 4-chloro-1, 8-naphthalic anhydride, glacial acetic acid and 3-dimethylamino propylamine to obtain 4-chloro-N-3-dimethylamino propyl-naphthyl imide; the subsequent reaction with sodium methoxide to introduce methoxy group and obtain 4, 4-methoxyl-N-3-dimethylamino propyl-naphthyl imide, which is reacted with allyl chloride to obtain quaternary ammonium salt of 4-methoxyl-N-3-dimethylamino propyl-naphthyl imide allyl chloride as fluorescent monomer with fluorescent characteristic and double bond; and the final polymerization with phosphorus containing compound, acrylic acid and other monomer to obtain the multifunctional water treating agent with corrosion retarding, scale inhibiting, dispersing and fluorescent tracing functions.

A phosphino-based mapropyl copolymer containing fluorescent group and its production are disclosed. The process is carried out by taking 4-bromine-1,8-naphthalic anhydride, glacial acetic acid and N, N-dimethyl-ethylenediamine as raw materials to obtain 4-bromine-N-(2-N,, N,-dimethylbenzidine-ethyl)naphthalimide, reacting it with sodium methoxide to induce methoxy-group to obtain 4-methoxy-N-(2-N,, N,- dimethylbenzidine-ethyl)naphthalimide, reacting it with allyl chloride to obtain fluorescent monomer 4-methoxy-N-(2-N,, N,- dimethylbenzidine-ethyl)naphthalimide allyl ammonia chloride with fluorescent characteristic and double-bond, polymerizing it with sub-sodium phosphate, maleic anhydride, acroleic acid and propenyl-sodium sulfate to obtain the final product. It has fluorescent tracting, corrosion-inhibting, scale-inhibiting and dispersion functions.

This invention relates to the vapor-phase oxidation of hydrocarbons by passing a gaseous mixture comprising of a molecular oxygen-containing gas and hydrocarbons which may contain substituents to a fixed bed of catalyst and provides a process for vapor-phase oxidation to be effected by passing a gaseous mixture of raw materials to a fixed bed of catalyst in which the void ratio of the catalyst layers increases by stages in one step or more from upstream downward in the flow of the gaseous mixture of raw materials. For example, the process can oxidize in vapor phase such hydrocarbons as naphthalene, xylene, benzene, toluene, durene, butene, acenaphthene, anthracene, indene and their derivatives in high yields with high productivity. Moreover, the process can prepare phthalic anhydride in high yields with high productivity by the vapor-phase oxidation of naphthalene or ortho-xylene.

This invention discloses anti inverse ester preparation method. 2-acetonyl-1, 4 diethyl succiante is high pressure condensed by diethyl maleate and acetone under organic amine condition. Then it cycles to get 3, 5-dioxygen hexahydrobenzoic acid ethyl esterunder sodium alcoholate condition, finally anti inverse ester is got by reacting with ring third formic anhydride under alkali condition. The operation is simple, reaction is wild, material is easy to get, yield is high, product purity is high, and generating cost is reduced, so it is propitious to industrial manufacure.

Bis(halophthalimides) are prepared in mixture in an organic liquid such as ortho-dichlorobenzene or anisole, by a reaction at a temperatire of at least 150° C. between at least one diamine compound and at least one halophthalic anhydride in the presence of imidization catalyst. The reaction mixture is maintained at about 15% by weight solids content and rich in the halophthalic anhydride by constantly monitoring the reaction mixture using analytical methods such as high performance liquid chromatography. The product mixture may be directly employed in the direct preparation of polyetherimides, and similar slurries may be employed to prepare other polyether polymers.

The invention relates to an n-type thermoelectric material compounded by 3,4,9,10-perylene imide (PDIN) or 1,4,5,8-naphthaline imide (NDIN) and carbon nano tubes, and a preparation method of the n-type thermoelectric material, in particular to a method of synthesizing PDIN or NDIN micromolecules with n-type conduction property by taking 3,4,9,10-perylene tetra-formic anhydride (PD) or 1,4,5,8-naphthaline tetra-formic anhydride (ND) as raw materials, and then compounding with single-walled carbon nanotubes (SWCNT) to prepare the n-type thermoelectric material. The n-type compounded thermoelectric material is an n-type thermoelectric material efficiently prepared by taking the cheap and easy-to-get p-type carbon nanotubes as a raw material, taking DMSO as a solvent, taking the NDIN or PDIN as a mixing body, and ultrasonically mixing at room temperature. The stable n-type thermoelectric material is formed by coating the surfaces of NDIN or PDIN crystals with the carbon nanotubes. The invention provides the high-performance n-type thermoelectric material, and also provides the new method for preparing the flexible and organic thermoelectric material with the advantages of simple and convenient preparation process, no toxicity and no need of aftertreatment.

The invention discloses thermoplastic polyimide resin and a preparation method thereof. According to the thermoplastic polyimide resin, 1, 2, 3, 4--biphenyl-tetracarboxylic acid dianhydride (BPDA) is reacted with other mixed dianhydride formed by common tetracarboxylic acid dianhydride, diamine and phthalic anhydride or aniline to polymerize the mixed dianhydride with the diamine, and the phthalic anhydride or the aniline serves as a blocking agent to control molecular weight, thus obtaining the polyimide resin with good thermal stability and excellent thermoplastic processability. The inherent viscosity of the polyimide resin can reach 0.22dL/g to 0.90dL/g, and the glass-transition temperature of the polyimide resin ranges from 220 DEG C to 420 DEG C, therefore, the polyimide resin has wide application in the preparation of materials such as thermostability engineering plastics, thin films, adhesives and the like.

The invention discloses a specific fluorescent probe for identifying hydrazine and an application thereof, belonging to the field of fine chemical engineering. The fluorescent probe is a 4-trifluoromethyl-7-aminocoumarin derivative, and is prepared by steps of putting 4-trifluoromethyl-7-aminocoumarin, phthalic anhydride and sodium acetate into a reaction bottle in proportion, and performing backflow by adding acetic acid. The fluorescent probe and the corresponding hydrazine content detection process cannot be interfered by biological system matrixes and impurities, so the fluorescent probe can be used for quantitative measurement of the hydrazine content in various biological systems. The probe has high specificity, and can be subjected to hydrolysis after specifically reacting with hydrazine; a hydrolysate has good fluorescence characteristics. Raw materials are cheap and easily available, can be obtained through chemical synthesis, and synthesis process is simple and feasible; the probe has high sensitivity, is suitable for detecting the hydrazine content in cells, and can be used for measuring the hydrazine content by drawing a standard curve. The probe is a ratio type probe, and effectively avoids the influences of non-uniform probe distribution, environmental factors, actuators and the like on the measurement results.

The invention relates to a preparation method of hyper-branched bio-based epoxy resin. The method comprises the following steps: initiating ring-opening polymerization of lactide by a coinitiator polyol to obtain hydroxyl-terminated polylactic acid with a low molecular weight, synthesizing carboxyl-terminated hyper-branched polyester from trimellitic anhydride and the obtained polylactic acid, and synthesizing the hyper-branched epoxy resin from chloropropylene oxide and the obtained hyper-branched polyester. Lactide is from corn, potato and other crops, has wide sources, and is in favor of reducing the consumption of petroleum resources and the discharge of CO2, and the obtained epoxy resin is a novel functional material with excellent performances, has the advantages of low viscosity, high solid content, easy film formation, and good adhesion and thermal stability, has good toughening and manufacturability improving effects when blended with common epoxy resin, can be used in adhesives, coatings and composite materials as a matrix, and is suitable for molding technologies of various composite materials, so the hyper-branched bio-based epoxy resin has very wide application prospect.

The invention provides polyurethane resin for hydrolysis-resistant film nubuck and a preparation method of the polyurethane resin. The polyurethane resin for the hydrolysis-resistant film nubuck is prepared by adopting the following components in percentage by weight: 5.0%-12.0% of poly(adipic acid) 1,4-butanediol esterdiol, 7.0%-9.0% of poly(adipic acid) phthalic anhydride neopentyl glycol esterdiol, 4.0%-8.0% of polypropylene oxide glycol, 0.01%-0.10% of antioxidants, 1.0%-3.0% of chain extenders, 0.05%-0.50% of auxiliary agents, 9.0%-13.0% of 4,4-diphenylmethane diisocyanate, 0.05%-0.50% of methanol and 55%-73% of dimethyl formamide. The film nubuck prepared from the polyurethane resin provided by the invention has a uniform and compact upright cellular structure, has good color development after being smoothed and is high in hydrolysis resistance and low in cost.

The invention discloses a heat-resistant single-component moisture-curing polyurethane adhesive and a preparation method and application thereof. The preparation method comprises the following step: carrying out esterification reaction on castor oil, phthalic anhydride and dihydric alcohol at first to prepare a castor oil modified polyester polyol with the functionality of 2.0-2.5 and containing abenzene ring aromatic structure and a long fatty acid molecular segment. When partially substituted polyols are used for modification of polyurethane, rigid benzene rings can be introduced into a soft segment. Distribution of microcrystals in the soft segment structure is controlled, so that the flexibility of an adhesive layer is enhanced; the cohesive strength is increased, and the heat resistance is improved; meanwhile, the modified castor oil polyester polyol can effectively control the crosslinking degree of the polymer and prevent the drastic reduction of performance of an adhesive or coagulation caused by excessive crosslinking degree. The castor oil modified polyester polyol is used for modifying polyurethane, so that the adhesive property and the heat resistance of the adhesive can be obviously improved. The adhesion problem of cracking at an adhesion position of wood during high-temperature baking processes such as wood drying and bent plate making in a wood processing process is solved.

The invention discloses an unsaturated polyester resin flame-retardant material and a preparation method thereof. The unsaturated polyester resin flame-retardant material comprises the following components in percentage by weight: 16.32%-25.04% of maleic anhydride, 8.47%-46.35% of DOPOMA (2-[10-(9,10-dihydro-9-oxa-10-phosphaphenantrene-10-oxide-10-yl)] maleic acid), 13.45%-18.91% of phthalic anhydride, 0%-5.12% of adipic acid, 5.48%-7.70% of glycol, 18.0%3-27.70% of propylene glycol, 9.19%-12.95% of diethylene glycol, 5.1%-7% of water-carrying agent, 0.02% of catalyst, 0.02% of polymerization inhibitor, 25%-35% of cross-linking agent, 25%-35% of diluent, 1% of modified nano SiO2, 1% of initiating agent, 0.25% of accelerant and 0.05% of defoaming agent; the raw material DOPOMA is synthesized by DOPO and MA at a mole ratio of 1:1.05; maleic anhydride, phthalic anhydride, adipic acid, glycol, propylene glycol and diethylene glycol are added to directly synthesize flame-retardant unsaturated polyester by a one-step method; the initiating agent, the accelerant and the defoaming agent are added to the flame-retardant unsaturated polyester doped with nano SiO2, heated and cured; and the unsaturated polyester resin flame-retardant material can be obtained.

The invention discloses phosphorous flame-retardant unsaturated polyester resin and a preparation method thereof. A formula of the phosphorous flame-retardant unsaturated polyester resin comprises the following components in percentage by weight: 18.39%-25.04% of maleic anhydride, 8.47%-25.35% of DOPOMA (2-[10-(9,10-dihydro-9-oxa-10-phosphaphenantrene-10-oxide-10-yl)] maleic acid), 13.45%-18.91% of phthalic anhydride, 6.80%-7.70% of glycol, 24.26%-27.70% of propylene glycol, 11.75%-12.95% of diethylene glycol, 5.1%-7% of a water-carrying agent, 0.02% of a catalyst, 0.02% of a polymerization inhibitor, 25%-35% of a cross-linking agent, and 25%-35% of a diluent. The preparation method of the polyester resin comprises the steps of synthesizing the raw material DOPOMA with DOPO and MA at a molar ratio of 1:1.05, adding maleic anhydride, phthalic anhydride, glycol, propylene glycol and diethylene glycol, and directly synthesizing the flame-retardant unsaturated polyester resin with a one-step method.

The invention pertains to the field of polymer materials, in particular to a polyimide prepolymer with comparatively high vitrification transformation temperature (270 DEG C to 320 DEG C), comparatively high stability of thermal oxidization, comparatively low viscosity and comparatively low cost, and a preparation method of the prepolymer. 1, 4-(para-aminophenoxy)-2-phenylbenzene is firstly added into an organic solvent and completely dissolved, then pyromellitic dianhydride is added into the organic solvent and reacts at room temperature for 3 hours to 10 hours, and then an end capping agent, 4-(2-phenylacetylenel) phthalic anhydride is added and the reaction continues for 1 hour to 3 hours. An obtained polyamide acid solution is put into an oven and the solvent is removed; under the condition of vacuum, the temperature is increased for thermal imidization and an obtained product is crushed to obtain the powdered polyimide prepolymer with a structure formula shown as follows.

The invention discloses a series of 11-replaced oxoisoaporphine derivatives as well as a synthetic method and an application thereof. The synthetic method comprises the following steps: (1) carrying out ring closing reaction on 3-chlorophthalic anhydride and phenylethylamine as raw materials so as to construct a 10-Cl-1-azabenzanthrone parent body; (2) nitrating the parent body compound so as to obtain a 11-site nitrated product, and reducing the 11-site nitrated product so as to obtain 11-amino-10-chlorine-7H-dibenzoquinoline-7-ketone; and (3) reacting the 11-amino-10-chlorine-7H-dibenzoquinoline-7-ketone with an acyl chloride compound connected with piperidine so as to obtain a corresponding target product. Through study, the applicant finds that the series of derivatives have very strong inhibitory activity on acetylcholin esterase and are expected to be used for treating AD (Alzheimer Disease), cerebrovascular dementia and related diseases caused by cholinergic neurotransmitter reduction. The structural formula of the 11-replaced oxoisoaporphine derivatives is shown in descriptions.

The invention provides a polyethylene terephthalate composite material for 3D printing and a preparation method thereof. The preparation method of the composite material comprises the following steps of: dissolving polyethylene glycol into isopropanol; adding benzyl triethylamine bromide, and standing at room temperature; then sequentially adding benzoic anhydride and ethyl alpha-cyanoacrylate, and stirring at room temperature; then adding polyethylene terephthalate granules, heating, stirring, and cooling to room temperature to obtain the polyethylene terephthalate composite material for 3D printing, wherein the content of polyethylene terephthalate is 40%-50%, the content of ethyl alpha-cyanoacrylate is 5%-25%, the content of polyethylene glycol 4000 is 5%-20%, the content of isopropanol is 15%-30%, the content of benzyl triethylamine bromide is 1%-5%, and the content of benzoic anhydride is 1%-5%. The polyethylene terephthalate composite material prepared through the method provided by the invention can be used for 3D printing within a temperature range of 40-60 DEG C without plugging a spray head of a 3D printer.

Sulfur trioxide is formed by a process wherein a first gaseous stream comprised of SO₂, SO₃, and oxygen and/or air is passed into a bed of a vanadium-containing catalyst that oxidizes S0₂ to SO₃and that releases therefrom a second gaseous stream comprised of sulfur trioxide. This process is improved in a first case by providing vaporized sulfur in the first gaseous stream so that the resultant mixture passes through a substantial portion of the catalyst bed, and maintaining the catalyst bed at one or more temperatures in the range of about 450 to about 700° C. The sulfur is oxidized to S0₂. As a result, the second gaseous stream released from the downstream end portion of the catalyst bed has an enriched content of sulfur trioxide, which can be used for production of compounds such as tetrabromophthalic anhydride. In a second case, a stream of sulfur dioxide is generated from sulfur and an oxidant, and this stream is introduced into the first gaseous stream referred to above. In this second case, the feed of sulfur dioxide replaces the vaporized sulfur used in the first case. As in the first case, an enriched stream of sulfur trioxide is released from the downstream end of the catalyst and can be used for producing compounds such as tetrabromophthalic anhydride.

The invention discloses a sulfide heavy metal chelating agent N1,N2,N4,N5-tetra(2-sulfydrylethyl)1,2,4,5-pyromellitic formamide and a preparation method thereof. The preparation method of the chelating agent comprises the following steps of: dissolving certain mol ratios of mercaptoethylamine hydrochloride and pyromellitic formic anhydride into dimethylformamide (DMF) at a certain temperature; agitating to react for a period of time and filtering to obtain the N1,N2,N4,N5-tetra(2-sulfydrylethyl)1,2,4,5-pyromellitic formamide. The sulfide heavy metal chelating agent provided by the invention is used for treating industrial wastewater containing heavy metal ions and can effectively avoid the generation of hydrogen sulfide; the sulfide heavy metal chelating agent can be rapidly reacted with various heavy metal ions in the wastewater at a room temperature to generate water-dissoluble sulfide sediment; the sediment is large in grain size and compact in flocs, so that the deposition time is shortened, heavy metal can be recycled from residues, and secondary pollution is not easy to happen. The sulfide heavy metal chelating agent N1,N2,N4,N5-tetra(2-sulfydrylethyl)1,2,4,5-pyromellitic formamide and the preparation method thereof, provided by the invention, have the advantages of simple preparation process, convenience for use and good treatment effect.

The invention provides a negative plate and a lithium ion battery. The negative plate comprises a negative electrode current collector and a negative electrode diaphragm; the negative electrode diaphragm comprises a negative electrode active substance and a conductive adhesive; the negative electrode current collector is prepared from rolled copper foil or stainless steel foil; the conductive adhesive is polyimidesiloxane containing conductive polymer chains; the conductive adhesive is prepared via amidation of tetra formic acid or tetra formic anhydride with diamine siloxane containing conductive polymer chains; and the molar ratio of the tetra formic acid or the tetra formic anhydride to the diamine siloxane containing conductive polymer chains is controlled to be (1.1-1.3):1. The negative plate possesses excellent conductivity and adhesive performance, and relatively low expansion ratio; and the lithium ion battery possesses excellent electrical properties and cycle performance.

The invention discloses water-based alkyd-acrylate dispersion as well as a preparation method and application thereof. The water-based alkyd-acrylate dispersion is prepared from the following raw materials: alkyd resin, an acrylate monomer, texanol, an initiator and a neutralizer, wherein the alkyd resin comprises the following raw materials: rosin, vegetable oil, polyol, phthalic anhydride, maleic anhydride, trimellitic anhydride, D40 solvent oil, an alcoholysis catalyst, an esterification catalyst and texanol. The water-based alkyd-acrylate dispersion is prepared from the raw materials through a chemical copolymerization method; wherein the particle size of the nano titanium dioxide is 178-188 nm, the Mw/Mn is 2.93 to 2.96, the grafting rate is 51-57%, the particle size is small and uniform, the stability is better, the grafting rate is high and the molecular weight distribution is more uniform; a molecular chain contains conjugated double bonds, carboxyl and other functional groups,so that the crosslinking density can be improved, the water absorption rate of a paint film is reduced, and the hardness, adhesive force, salt fog resistance and other properties of the paint film are improved.

The invention provides a water-based alkyd resin synthesis technique, relating to the technical field of chemical industry. The technique comprises the following steps: selecting a four-neck flask as a reactor, adding bean oil acid, benzoic acid, pentaerythritol, phthalic anhydride, 2,2-dimethylolpropionic acid and reflux xylene into the four-neck flask, introducing carbon dioxide gas to replace air inside, heating, keeping the temperature to perform esterification reaction, vacuumizing, removing the reflux xylene inside, adding maleic anhydride oil, carrying out thermal-insulation reaction, introducing triethylamine to perform neutralization reaction, adding deionized water, and stirring to obtain the water-based alkyd resin finished product. The technique has the advantages of convenient and simple preparation process, environment friendliness, no pollution, accessible raw materials, low equipment investment and pure quality, and is convenient for operation; and the prepared water-based alkyd resin has the advantages of favorable use effect, high safety, no toxicity, long storage time, low manufacturing cost and high safety and reliability.

The invention relates to an organic silicon modified epoxy-composite estolide nanometer composite surface heavy anticorrosive material and a preparation method thereof. The material has the following recipe: epoxy organic silicon polymers, 4, 4'- dihydroxy diphenyl diglycidyl ether epoxy resin, hydroxyphenol epoxy resin, nanometer composite mother liquid, enhanced carbon fiber, titanium pigment, molybdenum sesquioxide, polybenzoate, ceramic powder and mixed solvents are proportionally prepared into a first ingredient; dimethyl imidazole promoting agents, mixed solvents and composite anhydride curing agents prepared from phenyl ketone dianhydride, maleic dicarboxylic anhydride, pyromellitic anhydride and perylene anhydride are proportionally prepared into a second ingredient; and then, the first ingredient and the second ingredient are ground and mixed to be prepared into the surface heavy anticorrosive material. The surface heavy anticorrosive material with the thickness between 0.2 and 1.5 mm of the invention can effectively resist the corrosion damage of water vapor, oil gas and acid steam containing sulfureted hydrogen and sulfur dioxide under the conditions of the temperature between 80 and 180 DEG C and the pressure between 2 and 12 MPa, the problem of high temperature acidity strong corrosion in industries such as petrifaction, metallurgy, electrical power, coal and the like can be solved, and metal materials are effectively protected.