32 results about "HYPOPHOSPHITE ION" patented technology

A method of treating a metallic surface which comprises treating a metal-coated steel panel with a nonchromate metallic surface treating agent containing, in each liter thereof, (a-1) a silane coupling agent and/or a hydrolytic condensation product thereof, (a-2) water-dispersible silica in a proportion, and (a-3) a zirconium compound and/or a titanium compound, drying the treated steel panel and coating it with an anticorrosion coating agent containing, in each liter of an aqueous resin solution or dispersion, (b-1) a silane coupling agent and/or a hydrolytic condensation product thereof, (b-2) water-dispersible silica and (b-3) at least one phosphorus-containing ion selected from among phosphate ion, phosphite ion and hypophosphite ion.

Electroless copper plating solutions and methods of use thereof are disclosed. A representative electroless copper plating solution includes a reducing agent that is a source of hypophosphite ions and at least one accelerator compound that accelerates the rate of copper deposition.

In one embodiment, this invention relates to an aqueous acid iron phosphorus bath which comprises (A) at least one compound from which iron can be electrolytically deposited, (B) hypophosphite ion, and (C) a sulfur-containing compound selected from sulfoalkylated polyethylene imines, sulfonated safranin dye, and mercapto aliphatic sulfonic acids or alkali metal salts thereof. Optionally, the aqueous acidic iron phosphorus electroplating bath of the invention also may comprise aluminum irons. The alloys which are deposited on the substrates by the process of the present invention are characterized by the presence of iron, phosphorus and sulfur.

The present invention relates to a method for electroless deposition of a bendable nickel-phosphorous alloy layer onto flexible substrates such as flexible printed circuit boards and the like. The nickel-phosphorous alloy layer is deposited from an aqueous plating bath comprising nickel ions, hypophosphite ions, at least one complexing agent and a grain refining additive selected from the group consisting of formaldehyde and formaldehyde precursors. The nickel-phosphorous alloy layers obtained have a columnar microstructure oriented perpendicular to the flexible substrate and are sufficiently bendable.

The invention relates to a method for joint production of hypophosphite of calcium, magnesium and aluminum. The method provided by the invention employs sodium hypophosphite, a calcium salt, and a magnesium salt to carry out double decomposition reaction to prepare calcium hypophosphite and magnesium hypophosphite, and avoids the harm of using hypophosphorous acid as the reactant, also gives consideration to the technological shortcoming that after preparation of calcium hypophosphite and magnesium hypophosphite, a lot of hypophosphite still exists in waste liquid and cannot be completely extracted, after preparation of calcium hypophosphite and magnesium hypophosphite, a joint production technique is employed for the first time to prepare hypophosphite of aluminum. The preparation method has the advantages of mild reaction conditions, little pollution, pure product, high utilization rate of hypophosphite ions, high comprehensive yield, greatly reduced cost, and simple and practicable process route, and is convenient for mass production.

The invention discloses a preparation method of low-cost low-temperature lithium iron phosphate, and relates to the technical field of lithium ion battery positive electrode materials. The preparationmethod comprises the following steps: filtering a chemical chromium plating waste liquid; adding a photochemical oxidant ozone into the waste liquid, and carrying out a reaction to oxidize hypophosphite ions and phosphite ions in the waste liquid into orthophosphate ions; adding a ferric salt, adjusting the pH value to 2.0-2.5 h, and carrying out a heating reaction; carrying out aging, filter pressing, washing and slurrying treatment on the reaction product to obtain iron phosphate slurry; sequentially adding a lithium source and a carbon source into the iron phosphate slurry, mixing, forminga sand film, and carrying out spray drying to obtain a precursor; and calcining the precursor in a protective atmosphere to obtain the lithium iron phosphate material. According to the method, chemical chromium plating wastewater is used for preparing a lithium iron phosphate positive electrode material, wherein the process is simple, the environmental pressure is reduced, the production cost oflithium iron phosphate is reduced, and the obtained lithium iron phosphate is relatively good in performance and has good ionic conductivity, electronic conductivity and low-temperature resistance.

An electroless nickel plating bath is provided that utilizes hypophosphite ions as a reducing agent and is substantially free of sulphate and sodium ions. Spent nickel in the plating bath is removed using an ion exchange resin and the remaining effluent solution is usable for manufacturing fertilizer compositions. The nickel is processed for inclusion back into the plating bath. Thus, the process of the invention allows for the indefinite use of the solutions without discharging hazardous waste.

A method of extending the lifetime of an electroless nickel plating bath by avoiding the addition of unwanted anions to the process and of improving the pH stability of the bath and minimizing additions of pH correcting additives. The method includes the steps of (a) depositing electroless nickel from an electroless nickel plating bath onto a substrate, wherein the electroless nickel plating bath preferably contains a source of nickel ions and a source of hypophosphite ions; (2) immersing a nickel anode in the plating bath; (3) completing the circuit by utilizing a cathode separated from the nickel bath by an ion exchange membrane and using a catholyte comprising an acid or a salt thereof; and (4) passing a current through the bath. Nickel is dissolved into the plating bath to maintain the nickel concentration and hydrogen is discharged from the cathode.

The invention discloses a regeneration treatment method of an chemical nickel plating solution. The chemical nickel plating solution is contained into a reserved tank and then injected into a regeneration tank, a calcium hypophosphite solution is then added into the regeneration tank, stirring, standing and filtering are carried out to obtain first supernatant and first sediment, the first supernatant is reserved for later use, then the first sediment is washed, and a cleaning solution is collected and incorporated into the first supernatant; the calcium hypophosphite solution is added into the first supernatant, stirring, standing and filtering are carried out to obtain second supernatant and second sediment, then the second sediment is washed, a cleaning solution is collected and incorporated into the second supernatant, and the second supernatant is a regenerated chemical nickel plating crude solution; and nickel sulfate and sodium hypophosphite are added into the regenerated chemical nickel plating crude solution to obtain the regenerated chemical nickel plating solution. By means of the method, harmful ions including sulfate radicals and phosphite radicals are effectively removed, high-value substances such as nickel ions and hypophosphite ions are recovered, and recycling regeneration of a chemical nickel plating aging solution is realized.

The invention discloses a sample pretreatment method, a halogen content detection method and application, and relates to the technical field of analytical chemistry. The sample pretreatment method comprises the following steps: reacting a to-be-detected sample with a first iodide aqueous solution to obtain an intermediate sample; reacting the intermediate sample with a calcium hydroxide aqueous solution, and performing filtering to obtain a defluorination sample. The halogen content detection method comprises the following steps: pretreating a sample by adopting the pretreatment method; respectively detecting the ion content in the intermediate sample and the defluorination sample by adopting an ion chromatography method, and subtracting the measured ion content of the peak appearing in the defluorination sample for 2-4 minutes from the measured ion content of the peak appearing in the intermediate sample for 2-4 minutes to obtain the content of fluorine in the sample to be detected. The detection method can avoid inaccurate fluoride ion detection data caused by approximate appearance time and peak shape of hypophosphite ions and fluoride ions when ion chromatography is adopted todetect the ion content; therefore, the method is accurate in detection result and can be applied to detection of halogen content in wastewater.

The invention discloses a screening method for a drought-resistance corn germplasm, and belongs to the technical field of corn seed culturing and screening. The screening method for the drought-resistance corn germplasm comprises the following steps of seed selection, seed dressing, fertilizer application and ditching, sowing, watering, broadcast application of calcium hypophosphite, observation for the corn heading rate, harvesting and inspection for the corn yield; the calcium hypophosphite is dissolved in water, the calcium hypophosphite and moisture in soil can be subjected to a hydrolysis reaction, the calcium hypophosphite can be hydrolyzed into hypophosphite ions and calcium ions, and the hypophosphite ions can react with residual carbonate apatite to generate free phosphonium ions and calcium carbonate; the free phosphonium ions in soil can be effectively absorbed by corn roots, therefore the growth of the corn roots can be improved, the calcium carbonate has water absorption performance and can absorb moisture in the soil for corn growth, and therefore the drought-resistance capacity and lodging-resistance capacity of corn are improved.

An electroless nickel plating solution, including

• • a source of nickel ions,
  • a source of molybdenum ions,
  • a source of tungsten ions,
  • a source of hypophosphite ions
  • at least one complexing agent,
  • at least one organic sulphur containing compound in a concentration of 0.38-38.00 μmol/L, and
  • at least one amino acid in a concentration of 0.67-40.13 mmol/L, and

a method for electroless plating of a nickel alloy layer on a substrate, a nickel alloy layer, and

an article comprising the a nickel alloy layer.

An electroless nickel plating bath comprising: i) a source of nickel ions; ii) an effective amount of thiourea; iii) an effective amount of saccharin; iv) a source of hypophosphite ions; v) one or more chelating agents; and vi) optionally, other additives and a method of using the same to provide a high phosphorus electroless nickel plating deposit on a substrate. The high phosphorus electroless nickel deposit is capable of passing an RCA nitric acid test, whereby the substrate with the high phosphorus nickel deposit thereon is immersed into concentrated nickel acid for 30 seconds and a deposit that does not turn black or grey is deemed to have passed the RCA nitric acid test.

The invention discloses a clothing nursing agent, and a preparation method thereof, and belongs to the field of nursing agent. According to the preparation method, N-methyldiallylamine and chloropropene are reacted so as to obtain a crosslinked cation modified monomer, reaction groups capable of realizing covalent cross-linking with fabric hydroxy are introduced into the structure of the crosslinked cation modified monomer through mico-crosslinking with dimethyl diallyl ammonium chloride, so that the action connection of dye, fixing agent, and fabric is enhanced, it is beneficial for improvingof fabric color fixing performance, maintaining cloth color to be bright, and avoiding fading; a clothing nursing agent auxiliary agent D is prepared, hypophosphite groups in the clothing nursing agent auxiliary agent D are reacted with disulfide bonds on fabric cystine, so that disulfide bonds are broken, sulfhydryl groups are generated, fabric orientation friction effect and wool crimp elasticity effect are reduced, fluffing and pilling are prevented, and problems of conventional clothing fabric that fading, pilling, and hardening are caused after long term of using are solved.

The invention discloses a cultivation method for improving the growth and high-temperature resistance of summer corn and belongs to the technical field of corn planting. The cultivation method for improving the growth and high-temperature resistance of the summer corn specifically comprises the following steps of seed selection, seed dressing, fertilizing and ditching, sowing, watering, application of calcium hypophosphite, covering with mulching film, artificial pollination, topdressing and disease and pest treatment, and spraying of a mixed solution of an amino acid mixed solution and brassinolide onto corn in a high-temperature droughty weather. According to the method, calcium hypophosphite is dissolved in water to trigger a hydrolysis reaction with water in soil and then hydrolyzed into hypophosphite ions and calcium ions, the hypophosphite ions can react with residual carbonate apatite to generate free phosphorus ions and calcium carbonate, and the free phosphorus ions in the soil can be effectively absorbed by corn roots so that the growth of corn roots can be improved. Calcium carbonate has water absorption and can absorb water in the soil for the growth of the corn, so that the high-temperature resistance and lodging resistance of the corn are further improved.

The invention relates to tin salt hybridized melamine cyanurate and a preparation method and application thereof. In the process of synthesizing melamine cyanurate through melamine and cyanuric acid,metal ions and acid radical ions are introduced before a salt forming reaction, tin salt hybridized melamine cyanurate is prepared, a compound formed by combining the metal ions and the acid radical ions through ionic bonds is tin salt, the metal ions are tin ions or stannous ions, and the acid radical ions are cyanuric acid radical ions or phosphate anions or 2-carboxyethyl phenylphosphonic acidradical ions. Compared with melamine cyanurate, the temperature of prepared tin salt hybridized melamine cyanurate at the thermal weight loss of 5 wt% is improved by 10 DEG C to 50 DEG C, and the carbon yield at the temperature of 650 DEG C is increased by 10% or above, and tin salt hybridized melamine cyanurate can serve as a fire retardant and a smoke suppressant of a high polymer material. Themethod is simple and practicable, and prepared tin salt hybridized melamine cyanurate has a good flame retardant effect and smoke suppression effect.