8 results about "Phosphoric anhydride" patented technology

The invention discloses a flame-retardant epoxy resin pouring sealant as well as a preparation method and application thereof. The flame-retardant epoxy resin pouring sealant comprises a component A and a component B, the component A comprises the following components in parts by weight: 35-60 parts of epoxy resin; 15 to 30 parts of a toughening agent; 3-10 parts of a diluent; 0.2 to 0.5 part of a coupling agent; 10-15 parts of a heat-conducting filler A; the component B comprises the following components in parts by weight: 75-90 parts of a component curing agent; 1-3 parts of an accelerant; 15-20 parts of a heat-conducting filler B; the component A and the component B are mixed according to the mass ratio of 100: (30-50). The components of the epoxy resin pouring sealant are optimized, and the self-made phosphorus-containing anhydride curing agent and a double-phase synergistic toughening system are particularly adopted, so that the high-flame-retardant epoxy resin pouring sealant which has the characteristic of low density and is resistant to high and low temperature circulation is realized.

The utility model belongs to the technical field of butyl phosphoric anhydride preparation, and particularly relates to an anti-corrosion container for butyl phosphoric anhydride preparation, which comprises a U-shaped frame, two rotating assemblies are arranged on the U-shaped frame, each rotating assembly is provided with a connecting plate, one side of each connecting plate is provided with a semicircular cylinder, and the other side of each connecting plate is provided with an anti-corrosion layer. The two semicircular cylinders form a container body for bearing liquid, a semicircular anti-corrosion layer matched with the semicircular cylinder is arranged on the inner wall of each semicircular cylinder in a magnetic attraction mode, and the two semicircular anti-corrosion layers form a circular anti-corrosion layer for sealing an inner cavity of the container body. According to the device, the detachable anti-corrosion layer and the separable container body structure are adopted, when the anti-corrosion layer is damaged, only the local anti-corrosion layer needs to be replaced, and the maintenance cost is greatly reduced. In addition, the separable structure facilitates cleaning and maintenance in the container, the service life of the container is prolonged, and the use efficiency of the container is improved.

Disclosed are a nitrogen-containing compound and a preparation method therefor. Specifically, disclosed is a method for preparing a compound III, comprising the following steps: in the presence of a phosphoric acid anhydride-type condensing agent and an organic base, a compound II undergoing a condensation reaction with 2-aminoacetonitrile in an organic solvent, to obtain compound III. The preparation method for compound III disclosed in the present invention has one or more of the following advantages: good yield, low cost, low impurity residue, convenient post-processing, and suitability for industrial production.

The invention provides a method for synthesizing alpha-bromo-gamma-butyrolactone, which comprises the following step: by using 1-propyl phosphoric anhydride or 1-butyl phosphoric anhydride as a catalyst, reacting a substrate gamma-butyrolactone with a bromination reagent to obtain the alpha-bromo-gamma-butyrolactone. According to the method, the used raw material gamma-butyrolactone is cheap and easy to obtain, the route is short, the operation is convenient, the finally obtained by-products are few and easy to treat and purify, and the product with higher purity can be obtained without rectification.

An amide-containing aromatic diamine has the following structural formula: where Ar is a group with an aromatic ring structure. The preparation method includes the following steps: (1) mixing and reacting components including aromatic diamine, p-nitrobenzoic acid, alkyl phosphoric anhydride and polar aprotic organic solvent; (2) adding carboxylic acid and halogen-free quaternary ammonium salt to the product obtained in step (1) to obtain a mixed solution, which is placed in the cathode cell of an H-type electrolytic cell; the anode cell and the cathode cell are separated by a Nafion membrane; adding the same polar aprotic organic solvent and halogen-free organic electrolyte as the cathode cell to the anode cell of the H-type electrolytic cell, and adding a metal ion-free reducing agent; and conducting the reaction by electrolysis; (3) purifying the cathode reaction solution obtained in step (2) by post-treatment to obtain the amide-containing aromatic diamine. The yield, purity and whiteness of the amide-containing aromatic diamine are higher.

The invention discloses a gel solid-state battery. The battery comprises a positive electrode, a negative electrode, a diaphragm and electrolyte. Two times of liquid injection are adopted in the battery preparation process, and the electrolyte comprises a primary liquid injection electrolyte and a secondary liquid injection electrolyte; the primary injection electrolyte comprises a lithium salt, an organic solvent, a fluorophosphoric anhydride additive and a functional additive. According to the invention, the fluorophosphoric anhydride additive is used as Lewis base and can catalyze the polymerization of gel monomers, and no gas is generated. And the residual fluorophosphoric anhydride forms a large amount of inorganic compound components such as LiF in the interface film of the positive electrode and the negative electrode of the battery, so that the electrochemical and thermodynamic stability of the interface protection film SEI / CEI is improved, and the electrical performance and the safety performance of the battery are enhanced at the same time. In addition, the fluorophosphoric anhydride further enhances the crosslinking degree of the gel polymer and improves the binding force to the electrolyte, so that the vapor pressure and the reaction activity of the electrolyte are further reduced, the valve opening time of the battery cell is prolonged, the hazard level of thermal runaway of the battery is reduced, and the thermal safety performance of the battery is improved.

The application belongs to the technical field of medicine synthesis, and particularly relates to a preparation method of a tucatinib intermediate. The compound N-hydroxy-N'-[4-(2-methyl-4-nitrophenoxy)pyridin-2-yl]formamidine is used as a starting material, condensed with a compound 1-n-propyl phosphonic anhydride to prepare 7-(2-methyl-4-nitrophenoxy)-[1,2,4]triazolo[1,5-a]pyridine. The 1-n-propyl phosphonic anhydride is a low-toxicity, stable and easy-to-operate reagent. The by-product after reaction is a water-soluble phosphoric acid substance, so that the purity of the related product is also high, the operation is safe and environmentally friendly, and the method is suitable for industrial production.