36results about How to "PH effect" patented technology

The invention relates to a color change indicating device and transparent ink. The color change indicating device comprises a substrate layer, an indicating layer formed on the surface of the substrate layer and a protective layer covering the surface of the indicating layer, wherein the indicating layer comprises an indicating part formed through printing of indicating ink; the protective layer is formed through printing of the transparent ink which comprises a phase transfer catalyst, a binder and a solvent; the indicating ink comprises the phase transfer catalyst, the binder, the solvent and a pH indicator, the phase transfer catalyst is selected from at least one of quaternary ammonium salt, sodium hydroxide and sodium bicarbonate; the binder is selected from at least one of polyvinyl butyral, nitrocotton, polyvinyl alcohol, hydroxyethyl cellulose and hydroxypropyl cellulose; the pH value of the transparent ink is equal to that of the indicating ink, and the concentration of the phase transfer catalyst in the transparent ink is equal to that of the phase transfer catalyst in the indicating ink. The color change indicating device can effectively avoid pH deviation of the indicating part.

The invention relates to a color change indicating device and transparent printing ink.The color change indicating device comprises a substrate layer and an indicating layer formed on the surface of the substrate layer, the indicating layer comprises an indicating portion, and the indicating portion is printed by indicating printing ink; the color change indicating device further comprises a protection layer covering the surface of the indicating portion, the protection layer is printed with the transparent printing ink, and the transparent printing ink comprises volatile alkali, binder and solvent; indicating printing ink comprises volatile alkali, binder, solvent and pH indicator; the volatile alkali is selected from one or more of ammonium hydroxide, ammonium hydroxide, propylamine, n-butylamine, normal hexyl amine and n-octylamine; the binder is selected from one or more of polyvinyl butyral, nitrocotton, polyving akohol, hydroxyethyl cellulose and hydroxy propyl cellulose; the pH value of the transparent printing ink is the same as that of the indicating printing ink, and the concentration of volatile alkali in the transparent printing ink is the same as that of volatile alkali in the indicating printing ink.The color change indicating device can effectively avoid deviation of the pH value of the indicating portion.

The invention relates to a method for purifying ammonium sulfate mother liquor produced from sintering flue gas through an ammonia method desulfurization process. The method is characterized by comprising the following steps: adding an inorganic high-polymer flocculant polyaluminium chloride or polyaluminum sulfate into the ammonium sulfate mother liquor at 10-45 DEG C, stirring, dispersing, then adding a high-polymer coagulant aid for improving the structure of the flocculant, stirring, dispersing, further standing, fully precipitating, collecting the supernatant (namely the treated ammonium sulfate mother liquor), then performing pressure filtration on the lower-layer precipitate by using a plate-frame type pressure filter, collecting the filtrate (namely the treated ammonium sulfate mother liquor) obtained by pressure filtration, and merging with the collected supernatant. The process is simple, and the purification effect is good; the treated ammonium sulfate mother liquor system has no residues of the flocculant and the coagulant aid basically, and when the ammonium sulfate mother liquor system is returned into a desulfurizing tower for repeated use, adverse effects on the process in the desulfurizing tower can be avoided; and the cost is low, and the popularization is convenient to realize.

The invention discloses a compound leaching agent and its application. The composite leaching agent can selectively remove the heavy metal lead in soil, and simultaneously has high lead removal efficiency at one time. The composite leaching agent does not introduce additional salt, which avoids the secondary damage of the soil during the remediation process and the difficulty in post-treatment of the leaching agent. The weak alkaline of the composite leaching agent overcomes the prejudice that the soil leaching agent in the prior art is medium-strong acidic, and the weakly alkaline leaching agent does not have a great impact on the pH of the soil, so that after restoration The soil can be used for agriculture, which is more practical. The soil treated by the composite leaching agent will not cause secondary pollution, and at the same time, the composite leaching agent has low cost and is more favorable for large-scale application.

The invention relates to a color change indicating device and transparent ink. The color change indicating device comprises a basal layer, an indicating layer and a protective layer, wherein the indicating layer is formed on the surface of the basal layer and comprises an indicating portion formed by printing of indicating ink, and the protective layer covers the surface of the indicating portion and is formed by printing of the transparent ink. The transparent ink comprises volatile acids, binders, basic materials and solvents, the indicating ink comprises volatile acids, binders, basic materials, solvents and pH indicators, the volatile acids refer to carboxylic acids, the binders are selected from at least one of polyvinyl butyral, nitrocotton, polyvinyl alcohol, hydroxyethyl cellulose and hydroxy propyl cellulose, the solvents refer to alcohols solvents, a pH value of the transparent ink is as same as that of the indicating ink, and concentration of the volatile acids in the transparent ink is as same as that of the volatile acids in the indicating ink. The color change indicating device is capable of preventing a pH value of the indicating portion from deviation.