154 results about "Pyromellitic acid" patented technology

Organic lithium salts suitable for use in electrolytes for primary or secondary rechargeable batteries include de-localized bulky anions over Lewis acid fragments, typically BF₃, and organic moieties. The organic moieties may be, for example, anions derived from fused nitrogen heterocycles (e.g. benzeneimidate, benzitriazolate and the like); multi carboxylates (e.g. oxalate, 1,2,4,5-benzenetetracarboxylate and the like), and pyromellitic diimidate. The organic lithium salts of the invention have the general formula: Li_q[Org(MX_n)_m], in which Org represents the organic moieties and MX_n represents an organic or inorganic boron, aluminum or phosphorous containing Lewis acid. The organic lithium salts are conveniently prepared by reacting an organic compound having at least one de-protonation group selected from NH, OH, SH or COOH with an inorganic or organic lithium compound to generate an organic lithium processor salt, and thereafter bringing the organic lithium processor salt into contact with an inorganic or organic Lewis acid to obtain the organic lithium product salt.

The present invention relates to a binder resin composition for an electrode, including a polyamic acid and a solvent, wherein the polyamic acid is (i) a polyamic acid which includes a tetracarboxylic acid component including 10 to 100 mol % of 4,4′-oxydiphthalic acid and 90 to 0 mol % of 3,3′,4,4′-biphenyltetracarboxylic acid and/or pyromellitic acid and a diamine component including an aromatic diamine having 1 to 4 aromatic rings, (ii) a polyamic acid which includes a tetracarboxylic acid component including 3,3′,4,4′-biphenyltetracarboxylic acid dianhydride and a diamine component including 10 to 90 mol % of p-phenylene diamine and 90 to 10 mol % of 4,4′-diaminodiphenyl ether, or (iii) a polyamic acid which includes a tetracarboxylic acid component including 3,3′,4,4′-biphenyltetracarboxylic acid dianhydride and a diamine component including 40 mol % or more of a bis[4-(4-aminophenoxy)phenyl] compound.

An easily slidable polyimide film having a polyimide surface layer comprising a polyimide which is thermoplastic and has a glass transition temperature of 190-450° C., wherein there are dispersed in the polyimide of the polyimide surface layer, in a proportion of approximately 0.5-10 mass % based on the polyimide of the polyimide surface layer, wholly aromatic polyimide particles made of a polyimide comprising at least 80 mass % of a pyromellitic acid component and a p-phenylenediamine component, and having a median size of 0.3-0.8 μm and a maximum size of no greater than 2 μm, in at least about 1 μm of the polyimide surface layer.

The invention discloses an organic complex ZnNa2(C10H4O8)2(H2O)10, a preparation method of the organic complex and application of the organic complex serving as a polycyclic aromatic hydrocarbon adsorbent. The preparation method of the organic complex ZnNa2(C10H4O8)2(H2O)10 includes the steps of enabling pyromellitic acid, zinc nitrate hexahydrate and sodium hydroxide with the molar ratio of 1:1-2:2.5-3.5 to be added into a reaction vessel, adding ultrapure water, placing the reaction vessel in a hydrothermal reaction kettle to be heated, enabling the temperature to be set to be 150-170DEG C, taking the reaction vessel out to carry out filtering, and obtaining the metal complex ZnNa2(C10H4O8)2(H2O)10. The metal complex prepared through the preparation method is mainly used as the polycyclic aromatic hydrocarbon adsorbent, and particularly has great practical significance in enabling MOF to be applied to polycyclic aromatic hydrocarbon detection.

The invention discloses a method of recovering a polyimide raw material by hydrolyzing a polyimide waste thin film by ammonia water, and relates to ammonia water hydrolysis of a waste polypyromellitimide thin film and a recycling method of a hydrolyzed product pyromellitic acid. The concentration of ammonia water is 25-30wt%, the content of the waste thin film in the ammonia water is 20wt%, and the sublimation conditions of 4, 4'-diaminodiphenyl ether are that the temperature is 190-192 DEG C and the pressure is 0.2-0.3mmHg. The purity of the product is 99.9%, and the melting point is 192-193 DEG C. The pyromellitic acid is dehydrated for 2-3 hours at 250-260 DEG C at 100mmHg to remove about 10wt% of water, so that almost part of the pyromellitic acid is converted into pyromellitic dianhydride, wherein the sublimation conditions of the pyromellitic dianhydride are that the temperature is 250-260 DEG C, and the pressure is 0.2-0.3mmHg. The product is free from small black points, the purity is over 99.5%, and the melting point is 286-287 DEG C.

The invention relates to application of a moisture absorbing and sweat releasing finishing agent to polyester fiber materials. The moisture absorbing and sweat releasing finishing agent comprises the following raw materials: 5-10 parts of dimethyl terephthalate, 2-5 parts of N,N'-dyhydroxyl pyromellitic acid imide, 20-30 parts of propylene glycol block polyether, 25-100 parts of polyethyleneglycol, 13-40 parts of glycol and 0.2-1 part of a catalyst. In the finishing or dyeing process, a fiber material including the polyester fiber materials or composite materials of the polyester fiber materials and other fiber materials is added into a finishing bath or a dyeing bath, not only are the hydrophilicity, the moisture absorption and sweat discharge properties, the antistatic performance, the soil removal property and the soft hand feeling of the polyester fiber materials improved, but also the problem of low color fastness caused by thermal migration of a dye is effectively solved.

The invention discloses a flame-retardant type polyester resin as well as a preparation method and a powder coating with the same. The flame-retardant type polyester resin is prepared from the following main raw materials: 2-bromine-2-nitro-1,3-propylene glycol, neopentyl glycol, trihydroxymethyl melamine, trisphosphine oxide, tris(hydroxymethyl) phosphine oxide, tetrabromoterephthalic acid, pyromellitic acid diamide and an end-capping reagent. The finally obtained flame-retardant type polyester resin disclosed by the invention is relatively high in activity, can be cured at 120 DEG C, is applicable to medium density fiber plates, and is excellent in wood quality and excellent in curing filming property. In addition, polyester chain segments comprise flame-retardant elements, namely bromine, nitrogen and phosphorus of relatively high contents, so that excellent flame retardancy can be achieved, and the oxygen indexes can be up to 30 or greater.

Disclosed is a method for simultaneously preparing a pyromellitic acid and a terephthalic acid with coal serving as a raw material. The method includes firstly, adding potassium hydroxide, a coal sample and distilled water in a high pressure kettle to perform a reaction, cooling after the reaction to obtain an oxidation product, filtering and removing insoluble residues to obtain a filter liquor, acidizing the filter liquor by a concentrated sulfuric acid to enable a water soluble acid to be completely free, extracting a processed solution by butanone to obtain an extract liquor, subjecting the extract liquor to a vacuum evaporation to obtain a concentrate, recycling the butanone, subjecting the concentrate to a vacuum drying to obtain the water soluble acid, subjecting the water soluble acid to a selective decarboxylation in a mixed medium of an sulfuric acid, potassium acid sulfate and the distilled water to obtain the pyromellitic acid, adding coal acids and catalysts which remain after the preparation of the pyromellitic acid in a reacting kettle to perform a constant temperature isomerization reaction of the coal acids to obtain a filter liquor, cooling the filter liquor after the reaction, adjusting potential of hydrogen (pH) of the filter liquor by an diluted hydrochloric acid, precipitating the terephthalic acid in a sedimentation mode, filtering, washing and drying to obtain the refined terephthalic acid. By means of the method, the pyromellitic acid and the terephthalic acid can be simultaneously prepared, the reaction conditions are mild, conditions for devices are low, the terephthalic acid is a main product due to a high yield, and the pyromellitic acid is an auxiliary product.

The invention relates to a preparation method of high-flowability positive ion modified copolyester. Binary acid I, dihydric alcohol I and high-flowability branched structure modifiers are uniformly mixed and then subjected to esterification reaction, and isophthalic acid-5-sodium sulfonate and dihydric alcohol II esterification products are led in after esterification reaction and subjected to pre-condensation reaction and final polycondensation reaction to prepare the high-flowability positive ion modified copolyester. The high-flowability branched structure modifiers are more than one of pyromellitic anhydride, cyclopentane tetracarboxylic anhydride, benzophenone tetracarboxylic dianhydride, trimellitic anhydride, mellophanic dianhydride, pyromellitic acid, cyclopentane tetracid, benzophenone tetracid, trimellitic acid and mellophanic acid, and the dihydric alcohol II is more than one of butanediol, pentanediol, hexanediol, heptanediol, octylene glycol, nonanediol and decanediol. Two modified components are introduced, so that flow-activation energy is remarkably reduced, acting force of the copolyester and tube walls in the flowing process is reduced, and melt viscosity loss iseffectively controlled.

The invention provides a preparation method of a metal-organic framework carbon nanotube composite material, comprising the following steps: step 1) weighing pyromellitic acid and ceric ammonium nitrate with a molar ratio of 1: 1, adding the mixed solvent of organic solvent N, N-dimethylformamide and water is mixed to obtain a mixed solution, and the ratio of the mixed solution to the dimethylformamide is 5: 1; 2) place that mixed solution in an oil bath pot with the temperature of 80 to 120 DEG C for reaction for 30 minute to obtain grey powder; 3) that gray powder is respectively prepared byuse N, N-Dimethylformamide, and anhydrous methanol; 4) drying after the step 3), obtain nanometer metal organic frame-carbon nanotube composite material after drying. That metal organic frame-carbonnanotube composite material coating separator prepare by the invention is applied in a lithium sulfur battery, and the generation of the shuttle effect is effectively restrained, thereby improving thecycle stability of the battery and the specific capacity of the battery.

The present invention relates to a primer resin for semiconductor devices which comprises a polyamide resin represented by the following formula (1):

(wherein, R₁ represents a tetravalent aromatic tetracarboxylic acid residue selected from the group consisting of pyromellitic acid, 3,4,3′,4′-diphenyl ether tetracarboxylic acid, 2,3,6,7-naphthalenetetracarboxylic acid and 3,4,3′,4′-benzophenone tetracarboxylic acid, R₂ represents at least one kind of divalent diamine residue selected from the group consisting of diamino-4,4′-hydroxydiphenylsulfone, 4,4′-diamino-3,3′5,5′-tetraethyldiphenylmethane and 1,3-bis-(aminophenoxy)benzene, and n is a repeating number and represents a positive number of 10 to 1000) and has a lead frame comprising copper or 42 alloy, a semiconductor device having said primer resin layer between a lead frame comprising copper or 42 alloy and a cured product of a sealing resin, and a semiconductor sealing epoxy resin composition containing said primer resin; and said semiconductor device has an extremely improved adhesiveness between said lead frame and a cured product of a sealing resin composition and also is excellent in heat resistance and low moisture absorption.

The invention discloses a highly connected coordination polymer and a preparation method thereof. The highly connected coordination polymer adopts the following chemical formula: [Zn5(3,3'-tmbpt)(btec)2(OH)2], wherein betc is deprotonated 1,2,4,5-pyromellitic acid; 3,3'-tmbpt is 1-((1H-1,2,4-triazole)methyl)-3,5-bis(3-pyridyl)-1,2,4-triazole. Carboxyl groups of polycarboxylic acid anions can coordinate with metal ions to form metal clusters with larger size; the metal clusters serve as nodes, so that connections of the nodes can be greatly increased. In addition, distances among several coordinating groups of a polydentate nitrogen-containing ligand 3,3'-tmbpt is relatively large, so that steric hindrance is relatively small during coordination, and the metal clusters can further expand easily to form the coordination polymer adopting highly connected structure. The coordination polymer can serve as a broadband semiconductor material and a molecular-based light emitting material to be further developed and applied.

The present invention relates to a copper foil having a primer resin layer which improves the adhesive strength between a copper foil surface without roughening treatment and a substrate resin and a laminated sheet using the same and is characterized by using a polyimide represented by the following formula (1):

(wherein, R₁ represents a quadrivalent aromatic group which is a residual group of a dicarboxylic acid dianhydride ingredient (pyromellitic acid anhydride, 3,3′,4,4′-biphenyltetracarboxylic acid dianhydride, 3,3′,4,4′-benzophenontetracarboxylic acid dianhydride or 2,3,6,7-naphthalenetetracarboxylic acid dianhydride), R₂ represents a divalent aromatic group which is a residual group of a diamine ingredient (1,3-bis-(3-aminophenoxy)benzene, 3,3′-diamino-4,4′-dihydroxydiphenylsulfone or/and 4,4′-diamino-3,3′,5,5′-tetraethyldiphenylmethane), and n1 represents a repeating number) as a primer resin; and copper foils and laminated sheets having said polyimide layer as a primer have high adhesive strength and are suitable for flexible printed wiring boards.

Belonging to the field of paint, the invention in particular relates to a dual anticorrosive waterborne primer suitable for an outdoor metal substrate. The primer is composed of a component A and a component B in a weight ratio of 20:3. The component A consists of the following raw materials by weight: 20-30 parts of deionized water, 20-40 parts of water-based resin, 20-30 parts of pigment, 3-7 parts of graphene oxide, 1-2 parts of a coupling agent, 0.5-1 part of a dispersant, 0.3-1 part of an organosilicon leveling agent, and 5-6 parts of lotus leaf powder. The component B consists of the following raw materials by weight: 20-40 parts of polyamide, 3-8 parts of a catalyst, and 40-60 parts of pyromellitic acid. The primer film can undergo crosslinking rapidly to form a film under an ultralow temperature condition, is good in various tolerance, can tolerate salt mist for 3000h, acid and alkali for 1000h or more and water up to 180d or more.

The invention belongs to the technical field of chemical synthesis and particularly relates to a method for preparing polyester ether polyol. According to the method, pyromellitic dianhydride and dihydric alcohol serve as main raw materials, and through esterification reactions and etherification reactions, the polyester ether polyol is prepared out. The preparation method comprises the following steps: 1 putting the pyromellitic dianhydride, micromolecule dihydric alcohol and catalyst into a polyester reaction bottle, adding N[2] for production, and heating to the 120 DEG C to 140 DEG C. When product acid value is less than or equal to 1.5 mg KOH/g, stopping the reaction; cooling to be lower than 90 DEG C, conducting filter pressing, discharging materials, and obtaining pyromellitic acid polyester polyol. 2 putting the pyromellitic acid polyester polyol and amine catalyst into a polyether reaction still, and reducing pressure; putting epoxypropane into the reaction still, heating to 100 DEG C to 130 DEG C slowly, keeping the pressure inside the still to be within 0.07 MPa to 0.4 MPa, reacting for 1 h-4 h under the temperature and the pressure, conducting vacuuming, when the temperature lowers to be less than 90 DEG C, conducting filter pressing, discharging materials, and obtaining pyromellitic acid polyester ether polyol.

A process for producing a polycarboxylic acid which comprises performing liquid phase oxidation of polyalkyl-substituted aromatic aldehyde and/or oxide derivative of polyalkyl-substituted aromatic aldehyde as raw material for oxidation with molecular oxygen at two stages in water solvent in the presence of a catalyst comprising bromine or both bromine and a heavy metal(s) at a temperature of 180 to 280 ° C., thereby producing trimellitic acid or pyromellitic acid, wherein said liquid phase oxidation is performed in a continuous operation at the first stage and in a continuous operation or in a batch operation at the second stage and a total amount of bromine in said catalyst is divided to add separately at each the first stage and the second stage.

An oriented polyimide film with a high Young's modulus, satisfactory moist heat resistance and low moisture absorptivity, and a process for its production. The polyimide film is composed mainly of a pyromellitic acid component, with a p-phenylenediamine component at between 30 mole percent and 99 mole percent and a diamine component represented by the structural unit of the following formula (II) at between 1 mole percent and 70 mole percent:

(wherein Ar^IIa and Ar^IIb are each independently a C6-20 aromatic group optionally having an non-reactive substituent, and X in structural unit (II) consists of at least one group selected from among —O—, —O—Ar^IIc—O—, —SO₂— and —O—Ar^IId—O—Ar^IIe—O—), and the polyimide film is characterized by having two perpendicular directions in which the in-plane Young's modulus is 3 GPa or greater, and having a moisture absorptivity of no greater than 3.3 wt % at 72% RH, 25° C.

The invention discloses a vanadium-free denitration catalyst, wherein a CeO2 nanosheet is used as a matrix, and transition metal elements are uniformly incorporated into a CeO2 lattice. A preparationmethod of the vanadium-free denitration catalyst is further disclosed. The method includes: conducting chelation reaction in a water and ethanol mixed solution with cerium oxide as a main body, the transition metal elements as a dopant, a common alkali metal solution as a regulator and phthalic acid, biphenyldicarbox ylic acid, trimesic acid, pyromellitic acid or the like as a ligand; drying a product of the chelation reaction, calcining the product for 2-5h at the temperature of 400-700DEG C to obtain the vanadium-free denitration catalyst. The method has the advantages of being simple in production process, capable of obtaining raw materials easily and easy to industrialize, adopting non-toxic harmless components and being harmless to the environment and human health. The vanadium-free denitration catalyst prepared by the method has wide catalytic activity temperature window and high catalytic efficiency, and can be used for denitration of both fixed source industry and mobile sourceexhaust gas.

Disclosed is a method for producing a polyimide film, wherein a polyamic acid solution composition is coated on a base material and the resultant coating film is processed by heat treatment; the polyamic acid solution composition is obtained by introducing a specific chemical structure into a polyamic acid at a ratio within a specific range; and the polyamic acid has a chemical structure composed of a 3,3′,4,4′-biphenyltetracarboxylic acid component and/or a pyromellitic acid component, and a paraphenylenediamine component. Also disclosed is the polyamic acid solution composition.

A process for refined pyromellitic anhydride which comprises dissolving crude pyromellitic acid or crude pyromellitic anhydride in water, then cooling an aqueous solution thus obtained to perform crystallization as pyromellitic acid, then separating a crystal thus obtained from water, then anhydrating the crystal of pyromellitic acid thus separated with heating to produce pyromellitic anhydride, then vaporizing pyromellitic anhydride thus produced, cooling vapor of pyromellitic anhydride thus obtained, and thereby, recovering a refined crystal of pyromellitic anhydride.

The invention relates to a preparation method and application of an Eu<3+>-MOF material. The preparation method comprises the following steps: preparing an iron-based MOF material from ferrous chloride and pyromellitic acid and then preparing the Eu<3+>-MOF material from the prepared iron-based MOF material and europium nitrate. The prepared Eu<3+>-MOF material shows strong characteristic emissionlight of Eu<3+> and has good water stability and thermal stability. Ag<+> has good concentration dependence on the enhancement efficiency of Eu<3+>-MOF fluorescence. The detection range of Ag<+> is 0-150 [mu]M, the detection limit is 0.09 [mu]M, and the response speed of the material to Ag<+> is very fast (3 min).

The invention discloses an intercalated structure nano material with a room-temperature long-afterglow luminescence property and a preparation method thereof, and belongs to the field of inorganic and organic composite luminescent materials.According to the preparation method, two-dimensional hydrotalcite is selected as a subject, organic matter of phthalic acid, isophthalic acid, terephthalic acid, trimesic acid, pyromellitic acid, benzene hexacarboxylic acid and the like are selected to serve as objects, and the intercalated hydrotalcite nano material is obtained through a coprecipitation method.The intercalated structure nano material with the room-temperature long-afterglow luminescence property and the preparation method thereof have the advantages that the organic matter is fixed in a rigid hydrotalcite layer board through electrostatic and hydrogen-bond interaction, an energy loss, caused by aggregation and vibration, of the organic matter is greatly inhibited, and therefore the phosphorescence luminous efficiency is improved, and the phosphorescence luminescence lifetime is prolonged.At the room temperature, longer room-temperature afterglow luminescence can be produced after ultraviolet irradiation to the material is finished.Meanwhile, the obtained nano material has a potential application value in the fields of biology, medical science and the like.