A kind of inorganic system defilming liquid containing accelerator and using method thereof

Abstract

The invention provides an inorganic system film-removing solution containing an accelerator, including an inorganic base and an accelerator, and the accelerator is composed of a first component, a second component and a third component; the first component Be the ion source that hydration ion radius is less than or equal to 0.35nm, the concentration of described ion source is 10-400ppm; Described second component is the non-ionic surfactant that hydrophobic group molecular weight accounts for total molecular weight and reaches more than 50%, so The concentration of the nonionic surfactant is 5-200ppm; the third component is one or more of dimethyl sulfoxide and cyclic ether compounds, and the concentration of the third component is 20-800ppm; The carbon number of the cyclic ether compound is 4-12. Under the synergistic effect of inorganic alkali and ion source, non-ionic surfactant, dimethyl sulfoxide and / or cyclic ether compound, the film-removing speed of the film-removing solution is increased by more than 20%. The accelerator added in the system is a non-nitrogen accelerator, the total nitrogen in the sewage is low, and there is no nitrogen odor.

Description

technical field [0001] The invention relates to the technical field of circuit board processing, in particular to an inorganic system film-removing liquid containing an accelerator and a use method thereof. Background technique [0002] Inorganic defilming solution is a kind of sodium hydroxide or potassium hydroxide aqueous solution whose main component is about 3%. Due to the lower COD, total nitrogen and ammonia nitrogen of wastewater, the inorganic defilming solution has a tendency to gradually replace the organic defilming solution in recent years. The inorganic film-removing solution diffuses into the dry film or wet film system with inorganic alkali, and brings water molecules (hydrated sodium ions or hydrated potassium ions) into it at the same time, causing the dry film to swell. The inorganic alkali will react with the carboxyl groups in the dry film to form carboxylate, which will enhance the polarity of the dry film components, further strengthen the tendency of...

AI Technical Summary

Problems solved by technology

The film-removing accelerator used in CN107908084A is ammonia water, which has a large smell and can cause high ammonia nitrogen content in the product waste liquid, while other film-removing accelerators monoethanolamine, diethanolamine, triethanolamine, tetramethylammonium hydroxide, seventeen Amines, and this type of compound is a common component of organic film stripping solutions. The addition of such substances will cause the same defects as organic film stripping solutions, such as ammonia odor, poor stability (tetramethylammonium hydroxide), and poor solubility ( Heptadecylamine is insoluble in water) etc.

The accelerator used in the patent CN109831879A is one or more of ethanolamine, triethanolamine, and ammonia water, all of which are the main functional components of the organic film removal solution. There are problems such as ammonia odor similar to the above patent, and high total nitrogen in wastewater.

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