39 results about "Potassium thiosulfate" patented technology

The invention relates to the technical field of packaging paper, and particularly relates to a method for preparing waterproof cellophane. Emulsified paraffin and an acrylic acid monomer are subjectedto an emulsification reaction initiated by potassium thiosulfate to obtain modified emulsified liquid paraffin; bagasse is subjected to alkalization and yellowing to obtain cellulose viscose; after the cellulose viscose and the modified emulsified liquid paraffin are mixed and subjected to film drawing, a product is put into a coagulating bath and then taken out; and the product is subjected to water washing, alcohol washing and drying to obtain the waterproof cellophane. An esterification reaction allows distances among wood fibers to be reduced, thus improving waterproofness of the cellophane. The modified emulsified liquid paraffin has large bond energy and is a hydrophobic group, thus facilitating waterproofness improvement. Crosslinking occurs during film drawing because of the existence of acrylic acid so that compactness of the liquid paraffin that is a surface protective film of the viscose is improved and cellulose in the cellophane hardly absorbs water through the compact protective film, and therefore waterproofness of cellulose is improved and the cellophane has a wide application prospect.

The invention discloses elective etching solution of nickel or nickel alloy, and a preparation method and application thereof. The etching solution is prepared from the following ingredients in parts by weight: ferric trichloride, ferric trifluoroacetylacetonate, sulfamic acid, hexanedioic acid, gamma-3-aminopropyltriethoxysilane, potassium thiosulfate, hydrofluoric acid, imidazoline ammonium salt and deionized water. The etching solution provided by the invention has a proper etching speed for the nickel or nickel alloy, hardly corrodes copper, and is high in selectivity. In addition, an etched copper plate has a light surface, is free from sediments, is smooth and is free from lateral erosion.

The invention relates to a detection method of a lead ion. The method is characterized by comprising the steps of: adding a chloroauric acid water solution into deionized water, adding a cationic surfactant water solution under magnetic stirring, then slowly adding a newly prepared reductant water solution dropwisely, conducting magnetic stirring for 30min under room temperature, thus obtaining a surfactant modified Au nanoparticle detection liquid; taking two parts of the detection liquid in an equivalent amount; adding two parts of a thiosulfate water solution of an equivalent volume into the two detection liquids respectively, and shaking them uniformly so as to obtain a first mixed solution and a second mixed solution; adding ultrapure water and a solution to be detected in an equivalent volume into the first mixed solution and the second mixed solution respectively, mixing them well so as to form a third mixed solution and a fourth mixed solution; comparing the color change of the third mixed solution and the fourth mixed solution so as to determine whether existing a lead ion in the detected solution. The thiosulfate can be sodium hyposulfite or potassium thiosulfate. The method provided in the invention has the advantages of simple, convenient and rapid operation, low detection cost, small sampling amount and wide application scope.

The invention discloses an anti-pollution and easily-washable polyamide reverse osmosis composite membrane and a preparation method of the membrane. The method disclosed by the invention comprises the following steps: (1) sequentially washing a polyamide reverse osmosis composite membrane by using isopropanol and de-ionized water; (2) adding the washed polyamide reverse osmosis composite membrane, 4-(2-sulfoethyl)-1-(4-vinyl benzyl)pyridine glycine betaine, potassium thiosulfate, sodium hydrogen sulfite and de-ionized water into a container; introducing nitrogen and discharging oxygen in the container; and (3) sealing the container and carrying out reaction in a water bath. The method is simple and convenient, conditions are moderate and the environment-friendly effect is realized; the prepared anti-pollution and easily-washable polyamide reverse osmosis composite membrane has the strong anti-pollution capability; after being polluted, the surface of the membrane can be physically washed by changing the salt concentration of input water; an organic chemical washing agent is not needed; the durability of the membrane is improved; the cost is reduced and the service life of the membrane is prolonged.