115 results about "Phosphoric anhydride" patented technology

The invention discloses a preparation method of a lignin-based intumescent flame retardant. The preparation method comprises the steps of carrying out esterification reaction on phosphoric anhydride and lignin through optimizing reaction temperature, reaction time, reactant ratio and solvent selecting ratio and other process conditions; then, enabling the reaction product to react with melamine to obtain the lignin-based intumescent flame retardant which is integrated with an acid source, a carbon source and an air source and is high in char formation quantity and good in flame retardance. When the lignin-based intumescent flame retardant is independently applied to a P(3,4)HB biopolyester material or is applied to the P(3,4)HB biopolyester material after being compounded with other flame retardants, the compatibility of the lignin-based intumescent flame retardant and a matrix is good, so that the flame retardance of the material can be remarkably improved, meanwhile, the mechanical property of the material can also be improved, and a P(3,4)HB flame-retardant composite material with excellent comprehensive properties can be prepared. By using the preparation method disclosed by the invention, the yield is high; a reactant is basically nontoxic; the process conditions are easy to control; the operation process is simple; the lignin serving as a main raw material is an abundant regenerative resource, so that the price is low; and therefore, the lignin-based intumescent flame retardant is favorable in application prospect.

The invention discloses a preparation method of 4-[hydroxy(methyl)phosphoryl]-2-oxobutanoic acid as a glufosinate intermediate. The method comprises the following steps: 1) proper organic solvent, alkaline substance and phase-transfer catalyst are added to cyclic phosphoric anhydride at the temperature of subzero 30 DEG C, stirred, heated to 25-50 DEG C, subjected to a reaction with diethyl oxalate at the room temperature and stirred, and a product is obtained through direct precipitation and filtration from the solvent; 2) water is added to the product, hydrogen chloride is introduced slowly, the pH is controlled, heating is performed, water is removed through rotary evaporation after the reaction is performed for 16 h, and a final product is obtained through vacuum drying. The method has the advantages that the problems of poor solubility and high probability of precipitation of cyclic phosphoric anhydride at a low temperature as well as high probability of ring opening of anhydride and high probability of decomposition of phosphate groups of cyclic phosphoric anhydride under an alkaline condition due to temperature increasing are solved, and the feasibility for preparing 4-[hydroxy(methyl)phosphoryl]-2-oxobutanoic acid as the glufosinate intermediate from cyclic phosphoric anhydride is realized successfully.

The invention relates to a new method to prepare crosslinking polysulfonimides membrane, which comprises: dissolving the material in organic solvent with phosphoric anhydride, film forming with liquid moulding, drying for 2~20h at 60~200Deg; then, drying in vacuum for 1~30h at 100~200Deg; dipping the membrane in deionized water, clearing to neutrality, and drying in vacuum. This method is simple and economical. This product has well water resistance and high proton conductivity and wide application in fuel cell, ion exchange resin and sensor.

The invention provides a method for preparing a docetaxel conjugate under a carboxyl-modified mesoporous silica self-assembly system. The method comprises the following steps: preparing carboxyl-modified mesoporous silica particles; preparing a docetaxel ester-mesoporous silica self-assembly body; in the presence of a catalyst PyBOP and a reaction assistant n-propyl phosphoric anhydride, adding acondensating agent, enabling the prepared docetaxel ester-mesoporous silica self-assembly body and a coupling component to perform an esterification reaction in a dimethylsulfoxide solvent, and generating the docetaxel conjugate. The method is capable of, through using the combination of the modification mesoporous material and a catalyst / promoter system, forming a reaction interface on the surface of the mesoporous material, promoting a coupled reaction to be performed, and greatly improving the reaction efficiency.

The invention provides a high-temperature baking resistant phenolic molding compound containing additive, which comprises the following components by weight percent: 30-48% of phenolic resin; (2) 10-40% of wood powder; (3) 10-30% of mineral filler; (4) 4.0-9.0% of hexamine; (5) 0.5-5.0% of phosphoric anhydride and (6) 0.5-5.0% of acrylic ester nano particles or silicon rubber nano particles. The invention also discloses a method for preparing the high-temperature baking resistant phenolic molding compound. The phenolic molding compound can be baked for 2h at the temperature of 250 DEG C, and does not crack, foam or deform; and compared with the common bakelite, the cost of the invention is not obviously increased.

The invention discloses an electrolyte solution and a lithium-ion secondary battery. The electrolyte solution comprises an aprotic organic solvent, electrolyte lithium salt and an additive, wherein the additive is cyclic phosphoric anhydride; and the mass of the additive accounts for 0.01-10 percent of the total mass of the electrolyte solution. The lithium-ion secondary battery comprising the electrolyte solution can be subjected to electrochemical oxidation polymerization under the voltage of over 4.4V (vs.Li / Li+). By forming a polymer on the surface of a positive pole material, a good barrier is formed to cover strongly-oxidative active points of the positive pole material, and decomposition of a main solvent of the lithium-ion secondary battery is inhibited, so that the stability of the electrolyte solution under a high-voltage state and the high-voltage cycle and storage performances of a lithium-ion battery are improved.