5 results about "Phosphonous Acids" patented technology

The invention discloses a synthetic method of bis (1-methylheptyl) methylphosphonate, and belongs to the technical field of organic phosphorus compound preparation, and the synthetic method comprises the following specific steps: S1, adding phosphorus trichloride and a solvent into a reaction container, putting a reaction system into an ice-water bath, and dropwise adding sec-octanol into a phosphorus trichloride solution; after the reaction is finished, removing the solvent and unreacted sec-octanol through reduced pressure distillation to obtain an intermediate di (1-methylheptyl) phosphonite; s2, adding the di (1-methylheptyl) phosphonite obtained in the step S1 into an alkali solution, and putting a reaction system into an ice-water bath; after the reaction is completed, adding a methylation reagent into the system; and after the reaction is finished, washing the reaction liquid with water until the reaction liquid is neutral, and removing volatile components through reduced pressure distillation to obtain the target product methyl phosphonic acid di (1-methylheptyl) ester. The method provided by the invention has the advantages of high safety and strong process controllability, and is suitable for an alternative synthesis route of industrial production.

The application discloses a kind of dialkyl hypophosphite-alkyl phosphinic acid composite salt flame retardant and synthesis method thereof, it is related to organic phosphorus compound technical field, scheme is: the composite salt flame retardant is composed of dialkyl hypophosphite, alkyl phosphinic acid root and 2-4 valence metal ions;Its synthesis method includes that phosphine is added with gaseous or liquid olefin to occur radical addition, and the obtained addition product is oxidized, pH is adjusted and is salted with 2-4 valence metal salt, obtains target composite salt flame retardant.The beneficial effect of the application is: by controlling reaction ratio and subsequent conversion process, realizes the structure directional control from single salt to composite salt, so that the obtained product simultaneously has dialkyl hypophosphite and alkyl phosphinic acid root coexistence characteristics, while maintaining high conversion level, has stable preparation and good flame retardant application value.

The invention provides a method for separating and quantifying impurities in diethyl methylphosphonite. The method comprises the following steps: respectively dissolving a sample to be detected and an impurity standard substance in a solvent; a gas chromatograph is adopted for analysis, and chromatographic conditions are as follows: a chromatographic column is a capillary chromatographic column with a bonded and crosslinked 100% dimethyl polysiloxane filler as a stationary phase; the temperature of a sample inlet is 250-300 DEG C; the initial temperature ranges from 50 DEG C to 70 DEG C, and the temperature is kept for 1-2 min; the temperature is raised to 120-180 DEG C at the speed of 10-15 DEG C / min and kept for 1-5 min, and the temperature is raised to 200-250 DEG C at the speed of 15-20 DEG C The carrier gas is nitrogen, the flow velocity is 1-5ml / min, and the impurity content of the sample to be detected is calculated through an area normalization method or an external standard curve method. The detection method provided by the invention is efficient, simple, convenient, rapid, accurate and low in cost, and can be used for reaction monitoring and quality control in the production process of diethyl methylphosphonite.

Disclosed is a composition comprising 70 to 95 parts by mass of an epoxy resin with a viscosity of less than or equal to 20 Pa·s, for example between 1 and 20, or between 1 and 10, at a temperature of between 20° C. and 25° C., and 5 to 30 parts by mass of a hardener dispersed in the resin, per 100 parts by mass of resin present in the composition, wherein the hardener is an ionic liquid containing a phosphonium cation of formula P(R1R2R3R4)+ wherein R1, R2, R3 and R4, which may be identical or different, represent a hydrogen atom, an alkyl radical having 1 to 18 carbon atoms, an aryl radical having 6 to 20 carbon atoms, said alkyl and aryl radicals being optionally substituted, and an acetate anion of formula (R5CO2)− wherein R5 represents a hydrogen atom, an alkyl radical having 1 to 18 carbon atoms, an aryl radical having 6 to 20 carbon atoms, said alkyl and aryl radicals being optionally substituted, or a phosphinate anion of formula [[(CH3)3CCH2CH(CH3)CH2]2P(O)O]−. Further disclosed is the use of a composition for the manufacture of a hydrogen vessel, in particular a vessel operating under pressure, of types II, III, IV and V, comprising a composite material, for the on-board storage of gaseous hydrogen.

The invention discloses a preparation method and application of an RS-HAP composite material, the RS-HAP composite material is risedronate nano-functionalized hydroxyapatite, and the risedronate nano-functionalized hydroxyapatite is prepared by adopting risedronate sodium, diammonium hydrogen phosphate and calcium chloride as raw materials. The risedronate and the hydroxyapatite are tightly combined through a coprecipitation method by utilizing the excellent chelation effect of the risedronate on cations, so that the problem of loose reactant combination in traditional physical mixing or modification is effectively avoided. Meanwhile, the adsorption performance of RS-HAP on heavy metal ions such as Pb < 2 + > and Co < 2 + > is greatly improved through the strong chelating capacity of oxygen atoms of a risedronate phosphonite group on cations, and the breakthrough improvement of the adsorption performance of traditional HAP is achieved; the adsorbent has the advantages of large adsorption capacity, high adsorption efficiency, simple and controllable preparation process, stable material structure, wide application scene, excellent regeneration performance and the like.