18 results about "ETHYL PYRROLIDONE" patented technology

To provide a photosensitive resin composition containing an organic solvent other than NMP and exhibiting excellent photosensitivity.SOLUTION: A photosensitive resin composition contains: a polyimide precursor having a polymerizable unsaturated bond; a photopolymerization initiator; and a solvent. The solvent contains at least one selected from the group consisting of N-ethyl-2-pyrrolidone, 1,3-dimethyl-2-imidazolidinone, and tetramethylurea.SELECTED DRAWING: None

A method for producing a maleimide resin, the maleimide resin being a maleimide resin obtained by reacting a tetracarboxylic dianhydride (a1), an amine (a2), and maleic anhydride (a3), the method for producing the maleimide resin comprising the steps of: obtaining a polyimide resin by adding the amine (a2) to the tetracarboxylic dianhydride (a1) in the presence of an organic solvent; and obtaining the maleimide resin by adding the maleic anhydride (a3) to the polyimide resin, the organic solvent containing at least one of gamma-butyrolactone and N-ethyl-2-pyrrolidone, the amine (a2) containing a dimer diamine and a second amine other than the dimer diamine.

The invention provides a preparation method of 2, 2-difluoroethyl pyrrolidone, and the preparation method comprises the following steps: reacting difluoroethylamine with 4-chlorobutyryl chloride to obtain 4-chloro-N-(2, 2-difluoroethyl) butyramide; then, the 4-chloro-N-(2, 2-difluoroethyl) butyramide is subjected to a reaction in a sodium hydride dispersion solution, and 2, 2-difluoroethyl pyrrolidone is obtained; the preparation method is simple in reaction route, free of catalyst, mild in reaction condition and environmentally friendly, the obtained 2, 2-difluoroethyl pyrrolidone is high in purity and yield, the purity is larger than 90%, the yield is larger than 80%, and the 2, 2-difluoroethyl pyrrolidone can be used as an additive of lithium ion battery electrolyte.

The purpose of the present invention is to provide a photosensitive resin composition, a method for producing a cured film, and a method for producing a cured relief pattern, the photosensitive resin composition having excellent resolution even when a polymer having high absorbance such as a high glass transition temperature (Tg) is imparted thereto, and having reduced copper voids when in contact with copper. [Solution] A photosensitive resin composition comprising: (A) a polymer which is (A1) a soluble polyimide or (A2) a polyimide precursor; (B) a photopolymerization initiator; the solvent is N-ethyl-2-pyrrolidone; (E) a photopolymerizable unsaturated monomer; and (X) at least one substance selected from the group consisting of toluene, xylene, tetrahydrofuran, gamma-butyrolactone, and gamma-valerolactone, the content of the (X) being 1 ppm or more and 10000 ppm or less relative to the total mass of the photosensitive resin composition.

The present application relates to photoresist stripping liquid technical field, especially to a kind of photoresist organic stripping liquid and its preparation method and application.The present application provides a kind of photoresist organic stripping liquid, according to mass fraction, including organic amine 10~30 parts, ether / alcohol organic solvent 70~90 parts and additive 1~5 parts;The additive includes 1-(2-hydroxyethyl) piperazine, N-(2-hydroxyethyl) ethylenediamine, methyl benzene propyl triazoles, imino dipropylamine, 2,4-dihydroxy pyrimidine, succinic acid, N-ethyl pyrrolidone, 1-methyl-5-nitroimidazole, thiourea, 4-hydroxy butyric acid lactone, citric acid, glucose, gluconic acid and malic acid one or several kinds.The photoresist organic stripping liquid has higher stripping efficiency and stripping effect, energy saving and environmental protection, while avoiding strong corrosive substance.

The invention belongs to the technical field of cable preparation, and provides a low-temperature-resistant corrosion-resistant flexible robot cable and a preparation method thereof. The preparation method comprises the following steps: preparing tris (2-hydroxyethyl) phosphite from triphenyl phosphite and ethylene glycol; then, through free radical polymerization of 2-methyl-2-acrylic acid-2-hydroxyethyl ester phosphate and hydroxyethyl pyrrolidone, in combination with functional modification of 2-acrylamido-2-methylpropanesulfonic acid and a cross-linking reaction of divinyl benzene, a modified oligomer is obtained; meanwhile, through a polyesterification reaction of adipic acid, polytetrahydrofuran glycol, polypropylene glycol and tris (2-hydroxyethyl) phosphite ester and silanization modification of trifluoropropyltrimethoxysilane, a polyester hybrid with corrosion resistance is prepared; and finally, compounding low-density polyethylene, a polyolefin elastomer, the modified oligomer, the polyester hybrid and a plurality of auxiliaries to prepare a sheath layer master batch, and finally obtaining the low-temperature-resistant corrosion-resistant flexible robot cable.

The application relates to a preparation method of a plomiridine intermediate, and belongs to the technical field of organic chemistry. A reaction route is as follows: including the following steps: (S)-4-hydroxy-2-pyrrolidone is reacted with DAST to obtain (S)-4-fluoropyrrolidin-2-ketone; then sodium hydride catalysis is carried out to obtain (S)-4-fluoro-1-(1-phenyl-ethyl)-pyrrolidin-2-ketone; then the reaction is carried out with p-methylbenzenesulfonylmethyl isocyanide to obtain (4S,2S)-4-fluoro-1-(1-phenyl-ethyl)-pyrrolidin-2-carboxylic acid amide; then dehydration is carried out to obtain (4S,2S)-4-fluoro-1-(1-phenyl-ethyl)-pyrrolidin-2-nitrile; finally, after a side chain is removed, the reaction is carried out with hydrochloric acid to obtain (4S,2S)-4-fluoro-pyrrolidin-2-nitrile hydrochloride. The raw material is easy to obtain, the intermediate can be separated through simple crystallization, the preparation process is simplified, and the material cost of the product is reduced.

The invention belongs to the technical field of printing, and particularly relates to water-based pigment ink for a TIJ type ink-jet printer, and the water-based pigment ink comprises the following components: pigment color paste, N-ethyl pyrrolidone, a water-soluble organic solvent, an alkyne diol surfactant, a wetting agent consisting of acetylene ethanol and acetylene diol, and the balance of water. Compared with the prior art, the water-based pigment black ink keeps a long-time standby state in a printer nozzle without drying the nozzle, the cover opening time of an ink-jet printer is 2 hours or more, the ink can continuously print without blocking the nozzle, meanwhile, the ink is good in fluency and compatibility, and the service life of the ink-jet printer nozzle is longer than that of common ink.

To provide a formulation that effectively sterilizes Fusobacterium within a short time.SOLUTION: A Fusobacterium-sterilizing composition contains cetylpyridinium chloride, DL-pyrrolidonecarboxylic acid salt of N-cocoyl-L-arginine ethyl ester, citric acid, and / or disodium edetate.SELECTED DRAWING: None

This invention discloses a perovskite solar cell, its fabrication method, and a photovoltaic module. The fabrication method includes the following steps: S1, mixing a self-assembled monomolecular material with an organic solvent to obtain solution I; mixing solution I with a pyrrolidone compound to obtain solution II; coating solution II onto the surface of a conductive substrate; annealing solution I to obtain a hole transport layer; S2, coating a perovskite precursor solution onto the surface of the hole transport layer and annealing solution II to obtain a perovskite thin film; S3, sequentially fabricating an electron transport layer, a hole blocking layer, and an electrode on the surface of the perovskite thin film to obtain a perovskite solar cell; wherein the pyrrolidone compound is selected from at least one of 2-pyrrolidone, N-methylpyrrolidone, or N-ethylpyrrolidone. This method avoids the use of antisolvents and effectively improves the thin film quality and device performance.

The invention relates to a photosensitive resin composition and a method for manufacturing a cured relief pattern. [Problem] The purpose of the present invention is to provide: a photosensitive resin composition which has excellent chemical resistance, exhibits good elongation even when the curing temperature is low, and is capable of producing a cured relief pattern having good adhesion to copper wiring; and a method for producing a cured relief pattern using the photosensitive resin composition. [Solution] The present invention provides a photosensitive resin composition containing (A) a soluble polyimide, (B) a photopolymerization initiator, and (C) an organic solvent, in which N-ethyl-2-pyrrolidone is contained in an amount of 40% by mass or more based on the total mass of the (C) organic solvent, and an organic solvent having a boiling point of less than 140 DEG C is contained in an amount of 20% by mass or less.

The invention relates to a perovskite modification solution, a perovskite cell, a preparation method of the perovskite cell and a photovoltaic module. The perovskite modifying solution comprises a modifying agent, a passivating agent, a first solvent and a second solvent, the first solvent comprises at least one of dimethyl sulfoxide, dimethyl acetamide, N-methyl pyrrolidone, N-ethyl pyrrolidone, tetramethylene sulfoxide, methyl phenyl sulfoxide and butyrolactone, and the second solvent comprises at least one of dimethyl sulfoxide, dimethyl acetamide, N-methyl pyrrolidone, N-ethyl pyrrolidone, tetramethylene sulfoxide, methyl phenyl sulfoxide and butyrolactone; the second solvent comprises at least one of isopropanol, anisole, chlorobenzene, dichlorobenzene and ethyl acetate. According to the perovskite modification solution, the modification agent, the passivating agent and the specific type of the first solvent and the second solvent cooperate with each other to act together, so that the stability and the photoelectric conversion efficiency of the perovskite battery can be effectively improved.

The invention belongs to the technical field of solar cells, particularly provides a perovskite precursor solution and a preparation method thereof, a perovskite solar cell and a preparation method thereof, a photovoltaic module and a photovoltaic system, and aims to solve the problem that the performance of the perovskite cell is affected due to the fact that uneven crystal grains are easily formed when an existing perovskite precursor solution is crystallized. The perovskite precursor solution comprises a perovskite material, a solvent and an additive, the solvent is composed of a main solvent and a ligand solvent, the main solvent is an alcohol solvent, and the ligand solvent is one or more of N-methyl pyrrolidone, N-ethyl pyrrolidone, dimethyl sulfoxide, tetramethylene sulfoxide, methyl phenyl sulfoxide and N, N-dimethyl allyl urea; the additive is a functional cross-linking agent containing a trifluoromethyl bis (aziridine) group. When the perovskite precursor solution is used for preparing a perovskite light absorption layer, an ordered 3D perovskite crystal structure can be generated, the order degree of a perovskite crystal phase is improved, and then the battery performance is improved.

The present invention relates to a coating composition for a cathode of a lithium ion battery, said coating composition comprising polarity-modified polyvinylidene fluoride as an electrode binder and being substantially free of N-methyl-2-pyrrolidone and / or N-ethyl-2-pyrrolidone. In addition, suitable carbon dispersants are used in composite cathodes. In addition, the invention relates to the use of the coating composition for producing a cathode for a battery and to a battery with the cathode.

The invention relates to a preparation method of a Pulugliptin intermediate, and belongs to the technical field of organic chemistry. The reaction route is as follows: # imgabs0 #; comprising the following steps: carrying out a reaction on (S)-4-hydroxy-2-pyrrolidone and DAST to obtain (S)-4-fluoropyrrolidine-2-ketone; then reacting under the catalysis of sodium hydride to obtain (S)-4-fluoro-1-(1-phenyl-ethyl)-pyrrolidine-2-ketone; then, the (4S, 2S)-4-fluoro-1-(1-phenyl-ethyl)-pyrrolidine-2-carboxylic acid amide reacts with p-methylbenzenesulfonyl methyl isocyanide to obtain (4S, 2S)-4-fluoro-1-(1-phenyl-ethyl)-pyrrolidine-2-carboxylic acid amide; and then dehydrating to obtain (4S, 2S)-4-fluoro-1-(1-phenyl-ethyl)-pyrrolidine-2-nitrile; and finally, removing a side chain, and reacting with hydrochloric acid to obtain the (4S, 2S)-4-fluoro-pyrrolidine-2-nitrile hydrochloride. The raw materials are easy to obtain, the intermediate can be separated through simple crystallization, the preparation process is simplified, and meanwhile the material cost of the product is reduced.

The invention relates to the technical field of lithium ion batteries, in particular to a method for determining residual NMP (N-Methyl Pyrrolidone) in a lithium ion battery pole piece by an internal standard method.The method comprises the steps that S1, N-ethyl-2-pyrrolidone serves as an internal standard substance, and multiple groups of standard solutions of NMP and N-ethyl-2-pyrrolidone with different concentration ratios are prepared; s2, analyzing a plurality of groups of standard solutions of NMP and N-ethyl-2-pyrrolidone with different concentration ratios by adopting gas chromatography-mass spectrometry, and drawing a standard curve; s3, carrying out ultrasonic extraction on the lithium ion battery pole piece sample, and filtering to obtain a filtrate; and S4, carrying out gas chromatography-mass spectrometry analysis on the filtrate by using N-ethyl-2-pyrrolidone as an internal standard substance, and determining the content of residual NMP in the lithium ion battery pole piece sample. The method can accurately quantify the residual NMP content in the lithium ion battery pole piece.

The invention relates to a liquid crystal aligning agent, a liquid crystal alignment film, and a liquid crystal display element. Provided are a liquid crystal aligning agent, a liquid crystal aligning film, and a liquid crystal display element which are capable of suppressing poor coating of an aligning film and non-uniformity of display of a liquid crystal display element due to the influence of a wiring structure or C / H, and which are capable of reducing viscosity while maintaining a resin component and a molecular weight. A liquid crystal aligning agent containing: at least one polymer selected from the group consisting of polyimide precursors and polyimides that are imides thereof; and a solvent containing a solvent A, a solvent B, and a solvent C. Solvent A: is selected from the group consisting of N-methyl-2-pyrrolidone, N-ethyl-2-pyrrolidone, [gamma]-butyrolactone, and dimethylimidazolinone. The solvent B is dipropylene glycol dimethyl ether. Solvent C: selected from the group consisting of diethylene glycol diethyl ether and diacetone alcohol.