86 results about "Hypophosphite" patented technology

Aqueous, silicate free, cleaning compositions of about pH 9 or below and method of using the cleaning compositions for cleaning microelectronic substrates, which compositions are able to essentially completely clean such substrates and produce essentially no metal corrosion of the metal elements of such substrates. The aqueous cleaning compositions of this invention have (a) water, (b) at least one of ammonium and quaternary ammonium ions and (c) at least one of hypophosphite (H₂PO₂⁻) and/or phosphite (HPO₃²⁻) ions. The cleaning compositions also may contain fluoride ions. Optionally, the composition may contain other components such as organic solvents, oxidizing agent, surfactants, corrosion inhibitors and metal complexing agents.

The invention discloses a preparation method for a NiCoP nanowire electro-catalytic electrode. A NiCo salt nanowire is adopted as a phosphorization precursor, hypophosphite is used as a phosphorus source, and the phosphorization process of the NiCo salt nanowire is achieved by controlling the annealing technique in a stored program control tube type annealing furnace. The diameter of the NiCoP nanowire obtained through the method is 140 nanometers, the length of the obtained NiCoP nanowire is about 3.2 micrometers, and the surface of the nanowire is roughly and evenly grown on a 3D netty foamed nickel substrate, so that the specific surface area and the electric conductivity of an electro-catalytic material are effectively improved, and the electro-catalytic hydrogen evolution performance and stability of an electrode material are improved. The electro-catalytic hydrogen production performance of the electrode is tested in 1M of a KOH electrolyte, the overpotential under the electric current density of 10 mA/cm<2> is 109 mV, and the Tafel slope is 88.5 mV/dec, so that the material has the superior electro-catalytic hydrogen production performance compared with common electro-catalytic hydrogen evolution materials. Meanwhile, the preparation technique is simple, the equipment requirement is conventional, reactive materials are abundant, price is low, and the electrode is environmentally friendly.

The invention relates to a low-heat low-smoke flame retardant and application thereof in preparing a flame-retardant master batch. The low-heat low-smoke flame retardant comprises the following components in percentage by weight: 40-70% of hypophosphite, 20-50% of melamine compound, 0.1-10% of nano inorganic substance and 5-15% of assistant. The low-heat low-smoke flame retardant can be used for preparing a flame-retardant master batch. Compared with the prior art, the invention can effectively reduce the heat release rate, smoke release rate and total smoke generation quantity, thereby performing active functions of postponing the propagation of flame, reducing the rate of burning released substances and increasing the escape probability.

The invention discloses monoalkyl/dialkyl phosphinate and a preparation method thereof. The method comprises the steps that: organic solvent-water is adopted as a reaction medium; under the effect of an initiator I, hypophosphite is subjected to a reaction with alkene I under a temperature of 70-90 DEG C, such that monoalkyl phosphinate is obtained; the temperature is increased to 90-110 DEG C by heating; the obtained monoalkyl phosphinate is subjected to a reaction with alkene II under the effect of an initiator II, such that dialkyl phosphinate is obtained; Or, organic solvent-water is adopted as a reaction medium; under the effect of an initiator III, hypophosphite is subjected to a reaction with alkene III under a temperature of 70-120 DEG C, such that dialkyl phosphinate is obtained. The hypophosphite is hypophosphorous acid salt of Mg, Ca, Al, Sb, Sn, Ge, Ti, Zn, Fe, Zr, or Sr. According to the invention, the reaction period is short, obtained monoalkyl/dialkyl phosphinate can be precisely controlled, a total yield is high, and product purity is high. When the product is salified, the contents of other salts are low. The product is easy to wash.

The invention provides microencapsulated red phosphorus, and a preparation method and application thereof. The microencapsulated red phosphorus is prepared from red phosphorus and a coating layer outside the red phosphorus; the microencapsulated red phosphorus is characterized in that the coating layer is a coating layer I containing inorganic hypophosphite, optionally, a coating layer II containing an organic compound also wraps the outside of the coating layer I. The microencapsulated red phosphorus provided by the invention is used as a flame retardant, the whitening degree is high, the heat resistance is good, the water absorption is low, the compatibility with high polymer materials is better, and the influence on mechanical performance of the high molecular materials due to the adding of the flame retardant can be reduced.

The invention discloses a method for preparing encapsulated red phosphorus. The method comprises the following steps of: mixing red phosphorus powder and hypophosphite with two organic groups to prepare water suspension, wherein the molecular formula of the hypophosphite with two organic groups is (R1R2PO2)nM; adjusting the pH value of the solution to be 3 to 5 by using acid solution, raising the temperature to 50 to 60 DEG C, adjusting the pH value until the solution is neutral by using aqueous alkali; and continuously stirring for 0.5 to 2 hours, cooling and suction-filtering, washing with water, and performing vacuum drying to obtain the encapsulated red phosphorus product. In the method for preparing the encapsulated red phosphorus, the hypophosphite with two organic groups is directly added into the suspension of red phosphorus, the hypophosphite with two organic groups is deposited on the surfaces of the red phosphorus particles directly by adjusting the pH value of the solution, good stabilization effect can be used by using a small amount of a stabilizing agent, the phosphorus content of the product can be kept as much as possible, and the double effect of stabilizing and inflaming retarding can be achieved, so that an ideal and stable encapsulated red phosphorus product can be obtained.

The invention discloses monoalkyl/dialkyl phosphinate and a preparation method thereof. The method comprises the steps that: water is adopted as a reaction medium; under the effect of an initiator I, hypophosphite is subjected to a reaction with alkene I under a temperature of 70-90 DEG C, such that monoalkyl phosphinate is obtained; the temperature is increased to 90-110 DEG C by heating; the obtained monoalkyl phosphinate is subjected to a reaction with alkene II under the effect of an initiator II, such that dialkyl phosphinate is obtained; Or, water is adopted as a reaction medium; under the effect of an initiator III, hypophosphite is subjected to a reaction with alkene III under a temperature of 70-120 DEG C, such that dialkyl phosphinate is obtained. The hypophosphite is hypophosphorous acid salt of Mg, Ca, Al, Sb, Sn, Ge, Ti, Zn, Fe, Zr, or Sr. According to the invention, hypophosphite is directly adopted as a raw material, and the monoalkyl/dialkyl phosphinate is obtained with a one-step method. The reaction period is short, a total yield is high, product purity is high, process flow is simple, no organic solvent or other solvent is adopted, and no subsequent processing is needed. When the product is salified, the contents of other salts are low. The product is easy to wash.

The invention relates to an alkyl phosphinate polymer and a preparation method and application thereof. The method comprises the following steps of: filling a mixture of hypophosphorous acid or phosphinate and water or acetic acid into a pressure reactor with a jacket; when the mixture is heated to between 70 and 110 DEG C, adding alkyne into the pressure reactor through a pressure-reducing valvetill the mixture in the pressure reactor is saturated; uniformly adding aqueous solution of free radical initiator into the obtained mixture with continuous stirring till reaching the required alkynequantity, and then switching the alkyne into olefin; adding the olefin into the pressure reactor through the pressure-reducing valve till the mixture in the pressure reactor is saturated, uniformly adding a catalyst into the mixture, reacting the mixture for 8 to 12 hours, reducing the pressure of the pressure reactor, and cooling the mixture to 80 DEG C; and adding a metal compound into the pressure reactor to perform reaction, centrifuging the obtained solid, washing the solid by using water, and drying the solid in vacuum to obtain the alkyl phosphinate polymer. The invention also relates to the application of the alkyl phosphinate polymer serving as a flame retardant, a flame retardant composition and a flame-retardant polymer molding composition.

The invention discloses monoalkyl/dialkyl phosphinate and a preparation method thereof. The method comprises the steps that: an organic solvent is adopted as a reaction medium; under the effect of an initiator I, hypophosphite is subjected to a reaction with alkene I under a temperature of 70-90 DEG C, such that monoalkyl phosphinate is obtained; the temperature is increased to 90-110 DEG C by heating; the obtained monoalkyl phosphinate is subjected to a reaction with alkene II under the effect of an initiator II, such that dialkyl phosphinate is obtained; Or, an organic solvent is adopted as a reaction medium; under the effect of an initiator III, hypophosphite is subjected to a reaction with alkene III under a temperature of 70-120 DEG C, such that dialkyl phosphinate is obtained. The hypophosphite is hypophosphorous acid salt of Mg, Ca, Al, Sb, Sn, Ge, Ti, Zn, Fe, Zr, or Sr. According to the invention, hypophosphite is directly adopted as a raw material, and the monoalkyl/dialkyl phosphinate is obtained with a one-step method. The reaction period is short, obtained monoalkyl/dialkyl phosphinate can be precisely controlled, a total yield is high, and process floe is simple. When the product is salified, the contents of other salts are low. The product is easy to wash.

The invention provides a new method for preparing a catalyst of supported copper phosphide or non-supported copper phosphide (Cu3P) by the prosoma pyrolytic process of hypophosphite. The invention is characterized in that: the process adopted is simple; complicated steps such as high temperature, high pressure and temperature programming are not necessary; and the supported copper phosphide or non-supported copper phosphide can be prepared only under normal pressure by the pyrolytic process. The materials are low in cost and safe and the cost of equipment is low. Therefore, the method is very suitable for large-scale production. Copper phosphide can improve the clinkering performance of 316L stainless steel and can serve as a reinforcing agent in the production of high speed steel (HSS) composite materials. Due to the good performances of circulation and reversibility, copper phosphide can serve as the potential electrode material for cathode of the lithium ion battery.

The invention provides a new method for preparing molybdenum phosphide by reducing the precursor of molybdenum trioxide by utilizing the phosphine generated by hypophosphite in thermal decomposition.The method comprises the steps of: adopting ammonium molybdate as a, roasting the Mo source to obtain molybdenum trioxide, and then by dipping the molybdenum trioxide in solution, and obtaining the precursor; and synthesizing loaded and unloaded molybdenum phosphide by simple thermal decomposition of the precursor at low temperature. The method is characterized in that the adopted process is simple, the preparation temperature of the molybdenum phosphide is low, the production period is short, and the preparing process needs no flowing protective gas and complex steps such as temperature raising of program and the like except simple thermal treatment at constant pressure; the used raw materials are safe and low in cost, and equipment has low cost; and due to the better HDS and HDN activity, the catalyst can be widely used in the hydrotreating of oils.

The present invention provides compositions comprising particles or agglomerates of one or more phosphorus oxide telomer or cotelomer ((co)telomer) of one or more unsaturated carboxylic acids or anhydrides having a mean average particle size of from 2 μm to 1 mm, preferably from 5 to 500 μm, preferably, comprising at least one carboxylic acid anhydride group. In addition, the present invention provides methods comprising aqueous solution addition polymerizing a monomer mixture of one or more unsaturated carboxylic acid in the presence of a phosphorus oxide acid or salt compound, drying the resulting copolymer at a temperature of from 120 to 230° C. and reducing its particle size to make a phosphorus oxide (co)telomer particle or agglomerate; the methods may further comprise reacting the (co)telomer particle or agglomerate with one or more polyether polyol, alkyl polyether polyol, polyether amine or alkyl polyether amine, with heating, to form a comb polymer useful, e.g. as a superplasticizer or dispersant.

The invention relates to a microencapsulated inorganic hypophosphite flame retardant and a preparation method thereof. A capsule wall material of the microencapsulated inorganic hypophosphite flame retardant is a triazine ring containing crosslinked polymer. In order to solve the problem in the prior art that inorganic hypophosphite flame retardants are liable to combust spontaneously, the microencapsulated inorganic hypophosphite flame retardant is obtained by wrapping the surface of inorganic hypophosphite with the triazine ring containing crosslinked polymer as the capsule wall material through the microencapsulation technology. The microencapsulated inorganic hypophosphite flame retardant has the advantages of higher thermal stability, difficulty in spontaneous combustion, higher flame retardance efficiency, better compatibility with polymer matrices and the like. Besides, the preparation method is simple in process, is easy to operate and is suitable for industrial production.

The invention discloses a treatment method of chemical nickel-plating waste liquid. The treatment method comprises the following steps: S1, nickel precipitation: adding a precipitant into the chemicalnickel-plating waste liquid to precipitate nickel, and filtering and separating the nickel; S2, oxidization: oxidizing hypophosphite and phosphite into orthophosphate by adopting an iron-carbon micro-electrolysis oxidation method,wherein the nickel ions are reduced into elemental nickel through iron, and the Fe<2+> is generated at the same time, then adding hydrogen peroxide to oxidize the Fe<2+>in the waste liquid is oxidized into Fe<3+>, and oxidize the hypophosphite and phosphite into orthophosphate, wherein the Fe<3+> and orthophosphate form an iron phosphate precipitate. The method hasthe advantages that nickel and phosphorus in the chemical nickel plating waste liquid can be separated through one-step treatment, so that the waste liquid reaches the national emission standard, andthe treatment method is simple and low in cost.

The invention provides a slag-based road grouting material and a preparation method thereof. The slurry is stable, the precipitation and separation phenomena are avoided, and the compressive strengthof each age, the fluidity at different time and the expansion rate meet the standard requirements. The slag-based road grouting material comprises a cementing material and an additive, the cementing material comprises the following raw materials: 50-70 parts of slag powder, 6-10 parts of desulfurized gypsum, 5-9 parts of a special alkaline activator for slag, and 20-30 parts of fly ash, and the additive is prepared from the following raw materials in parts by weight: 0.3-0.4 parts of a hypophosphite modified polycarboxylate superplasticizer, 0.1-0.2 parts of a retarder, 0.5-0.6 parts of an expanding agent, and 0.04-0.06 parts of an antifoaming agent.

The invention provides a novel method for preparing loaded or unloaded molybdenum phosphide (MoP) by hypophosphite precursor thermal decomposition, the invention is characterized in that the process adopted is simple; complicated procedures like high temperature, high pressure, temperature programming and the like are not needed; loaded and unloaded molybdenum phosphide (MoP) can be prepared by simple heat treatment under normal pressure; the used raw materials are low in price and safe and the needed device is low in cost, thus being applicable to industrial production; the catalyst can be widely used in hydrotreating of oils, due to good HDS and HDN activities thereof.

The invention discloses a chemical nickel plating aging liquid reduction regeneration method. The method comprises the following operation steps that firstly, a recyclable chelating agent is adopted for adsorbing nickel ions in aging liquid, then sulfuric acid is used for desorption, nickel sulfate is prepared and can be returned to a chemical nickel plating production line to be used, then an evaporation concentration process is carried out, sodium sulfate crystals are crystallized and separated, the remaining liquid is subjected to an electrodialysis and electrochemical reduction combined method, phosphite is reduced into hypophosphite, and then the hypophosphite is recycled to the chemical nickel plating production line. According to the method, the comprehensive resource utilization technology is adopted for treating the chemical nickel plating aging liquid, nickel sulfate can be recycled from the aging liquid, hypophosphite can be recycled, resources can be thoroughly utilized, few chemical agents are added, the treatment cost is low, and better use prospects can be brought.

The invention relates to a treatment method of waste liquid, in particular to a treatment method of chemical nickel plating waste liquid. The treatment method comprises the following steps of: removing nickel from the chemical nickel plating waste liquid to be treated to obtain a first treatment liquid; and concentrating the first treatment liquid until the solid content is more than 20%, and carrying out high-temperature oxidation under the conditions that the oxygen concentration is 20-100% and the temperature is 300-1200 DEG C. According to the treatment method provided by the invention, low-valence phosphorus (namely monovalent hypophosphite and trivalent phosphite) in the chemical nickel plating waste liquid can be completely oxidized into pentavalent phosphate with biological effectiveness, so that resource recycling is realized; meanwhile, the nickel in the chemical nickel plating waste liquid can be efficiently removed, so that resource utilization of the nickel in the waste liquid is realized; and the removal rate of nickel is as high as 99.99%.

An electroless nickel plating solution and a method of using the same to produce a nickel deposit having a phosphorus content that remains at about 12% throughout the lifetime of the electroless nickel plating solution is disclosed. The electroless nickel plating solution comprises (a) a source of nickel ions; (b) a reducing agent comprising a hypophosphite; and (c) a chelation system comprising: (i) one or more dicarboxylic acids; and (ii) one or more alpha hydroxy carboxylic acids. The electroless nickel plating solution may also comprise stabilizers and brighteners.