9 results about "Oxalic acid" patented technology

The invention relates to a preparation method of bar-shaped NiTiO3 nano-crystalline, which comprises the following steps that: nickel nitrate hexahydrate is added into ethanol to obtain solution A; tetrabutyl titanate, oxalic acid and water are added into solution A to obtain solution B; after the solution B is arranged into a ultraviolet microwave instrument to be radiated for a given period of time, sediment is produced in the solution. The filtered sediment is arranged inside a drying box to be dried after being washed by acetone to obtain the final product - bar-shaped NiTiO3 nano-crystalline without any foreign matters. The prepared NiTiO3 nano-crystalline particles have small size, good dispersion, uniform distribution of particles, less agglomeration phenomenon and is free from containing any foreign matters; the prepared NiTiO3 nano-crystalline has short reaction period, good repeatability, simple preparation, convenient operation, easy obtaining of raw material and low preparation cost.

The invention discloses an ink cleaning agent with no damage to the equipment. The ink cleaning agent is characterized by comprising the following raw materials by weight: 5-7 parts of nonylphenol polyoxyethylene ether, 2-3 parts of sodium sulfonate, 1-2 parts of triethanolamine, 2-3 parts of oxalic acid, 3-4 parts of limonene, 1-2 parts of tea saponin, 1-2 parts of sodium tungstate, 2-3 parts of urotropine, 1-2 parts of sodium dichromate, 1-2 parts of sodium lauryl sulfate, 1-2 parts of sodium tripolyphosphate, 2-3 parts of castor oil, 4-5 parts of an auxiliary agent and 100-110 parts of water. The additives added in the invention improve the process performances of the cleaning agent and reduce toxic and side effects and the pollution to the environment. The ink cleaning agent provided by the invention has the advanategs of strong cleaning ability, no toxicity, no volatilization, no harm to human body, no damage or corrosion on the printing equipment, low production cost, safety, environment-friendliness and wide application prospect.

The invention relates to the technical field of batteries, in particular to a lithium-rich anode material and a preparation method thereof. The preparation method comprises special steps: dissolvable Ni slat, Co salt, Mn salt and Li salt are firstly dissolved in an appropriate amount of organic alcohol solution according to a stoichiometric ratio, and a metal salt solution with a certain concentration is prepared; then, oxalic acid is dissolved in the organic alcohol solution, and an oxalate solution with a certain concentration is prepared; then, the metal salt solution and the oxalate solution are mixed to form a co-precipitation solution, the co-precipitation solution is aged, filtered and dried, so that a precipitate precursor is obtained; finally, the precursor is subjected to high temperature sintering, and the lithium-rich anode material xLi2MnO3.(1-x)LiMO2 (M is Co, Mn, Ni, Ni1/2Mn1/2, or Ni1/3Co1/3Mn1/3) is obtained. The preparation cost of the method is lower, and the shape and the size of the lithium-rich anode material are easier to control.

The invention relates to the field of aluminum alloys, in particular to an aluminum alloy and a preparation method thereof. The aluminum alloy comprises an aluminum alloy matrix and a hard anodic oxide film located on the surface of the aluminum alloy matrix. The surface of the hard anodic oxide film is provided with micropores. Particles generated in the hard anodic oxidation process adhere to the inner walls of the micropores. The preparation method comprises the steps that, an aluminum alloy precursor needing to be treated is subjected to S1 alkali cleaning, S2 pickling, S3 acid etching, S4hard anodic oxidation, S5 hot water washing, S6 passivation and S7 sealing, thus the aluminum alloy is obtained, wherein an electrolyte used in hard anodic oxidation in the S4 comprises the components of phytic acid, oxalic acid, citric acid, boric acid and lactic acid. The prepared aluminum alloy is higher in corrosion resistance, higher in hardness and better in wear resistance, and can be applied to the fields of aerospace, aviation and computer manufacturing, automobile and rail train manufacturing and the like.

The present invention discloses a corrosion-resistant and aging-resistant building brick, which comprises the following raw materials in weight part: 20-30 parts of cement, 5-15 parts of meerschaum, 5-15 parts of fly ash, 1-4 parts of magnesium oxide, 5-12 parts of calcium hydrate, 1-6 parts of barite, 15-25 parts of attapulgite, 1-4 parts of wollastonite, 5-12 parts of construction wastes, 5-12 parts of modified montmorillonite, 1-2 parts of cyclodextrin, 0.2-0.8 part of ethylene-vinyl acetate copolymer, and 0.1-0.5 part of polysiloxanes powder. The preparation process of the modified montmorillonite comprises the steps of adding montmorillonite powders and sodium dihydrogen phosphate into an oxalic acid solution, stirring the solution, standing the solution, extracting an upper layer of suspending liquid, adding sodium hydroxide into the suspending liquid, stirring, adding oxalic acid, stirring, adding potassium dihydrogen phosphate, stirring, adding ethylene diamine tetraacetic acid, stirring, centrifuging, drying, crushing, then adding a silane coupling agent and water to adjust the pH value of the system, stirring, filtering, washing, adding a glutaraldehyde aqueous solution, stirring, filtering, and drying to obtain the modified montmorillonite.

The invention relates to a lead-acid storage battery cast-welding agent. The lead-acid storage battery cast-welding agent comprises, by mass, 0.5%-3.0% of oxalic acid, 0.1%-0.5% of salicylic acid, 25%-50% of metaphosphoric acid and the balance pure water. The invention further relates to a welding method using the cast-welding agent and application of the cast-welding agent. According to the lead-acid storage battery cast-welding agent, the large-current discharge performance is good, the battery cycle life is long, and the defects that in an existing power type battery, the welding quality ispoor, and incontinuous welding and false welding are generated in the battery using period are overcome.

The invention relates to refining methods of polymer materials and in particular relates to a method for refining a poly(ether-ketone-ketone) crude product by using a hydrochloric acid water solution of oxalic acid. The refining method comprises the following steps: firstly carrying out reflux stirring on a certain amount of poly(ether-ketone-ketone) crude product in a water solution containing dimethyl sulfoxide; and then adding the hydrochloric acid water solution of oxalic acid, carrying out reflux stirring and carrying out filtration after cooling; then carrying out reflux washing with a mixed water solution of glycolic acid and formic acid and carrying out filtration and drying, thus obtaining the poly(ether-ketone-ketone) pure product. Poly(ether-ketone-ketone) molecular chains tightly wrapping catalyst impurities can be unfurled by utilizing the poly(ether-ketone-ketone) swelling characteristic of the water solution containing dimethyl sulfoxide, so that impurity ions are exposed and diffused into media, and meanwhile, metal ions are continuously trapped by utilizing the metal ion chelating characteristic of oxalic acid under acidic conditions, thus achieving efficient removal of Al<3+> in the poly(ether-ketone-ketone) crude product.