Polishing agent for alkaline non-cyanide zincate zinc plating and process for preparing polishing agent composition
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A technology of cyanide zincate and brightener, which is applied in the field of electroplating zinc brightener and composition brightener, can solve problems such as unsatisfactory effects, and achieve the effects of low cost, easy dissolution, and convenient use
Active Publication Date: 2006-11-08
JIANGMEN DESHANG KEZUO TECHNOLOGY INDUSTRIAL CO LTD
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Problems solved by technology
[0007] Although people have been continuously improving the alkaline cyanide-free zincate galvanizing brightener in recent decades, it has not yet achieved satisfactory results.
Method used
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Embodiment 1
[0048] In the reactor, add 13.6g imidazole, 15.7g diethanolamine, 20.2gN, N'-di(N,N-dimethylaminoethyl) urea, 200ml water (the water added at this time should be able to fully dissolve the added compound), heated to 50°C, added dropwise 55.6g of epichlorohydrin, and the dropwise addition time was 40 minutes, and the temperature was controlled below the reflux temperature. Keep it warm at this temperature for 8 hours, cool it down, and recover it to obtain the galvanized brightener.
Embodiment 2
[0050] In the reactor, add 16.2g 2-methylimidazole, 22.4g triethanolamine, 23g N, N'-bis(N,N-dimethylaminopropyl) urea, 200ml water, raise the temperature to 60°C, start to drop 64.8g of epichlorohydrin, the dropping time is 60 minutes, the temperature is controlled below the reflux temperature, after the dropping is completed, the temperature is raised to 95°C, and kept at this temperature for 10 hours, cooled, recovered, and galvanized brightener.
Embodiment 3
[0052]In the reactor, add 16.2g of 2-methylimidazole, 17.8g of N-methyldiethanolamine, 24.6g of N,N'-di(N,N-dimethylaminopropyl)thiourea, 200ml of water, and heat up to 70°C , began to add 55.6g of epichlorohydrin dropwise, and the dropping time was 40 minutes. That is to get galvanized brightener.
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Abstract
The basic cyanide-free zincate galvanizing brightener and its composition brightener are copolymerized polymers produced by random copolymerization of compounds in the following molar ratios, the compounds and their molar ratios being: at least one nitrogen-containing Cyclic compound: at least one hydroxylamine: at least one di-tertiary amine containing acyl or sulfonyl group: epihalohydrin and / or glycerol halohydrin=0.5~5.0: 0.5~4.0: 0.5~5.0: 4.0~10.0; The preparation method is as follows: heating the nitrogen-containing heterocyclic compound, hydroxylamine, di-tertiary amine containing acyl group or sulfonyl group and an appropriate amount of water in the above formula, and adding epihalohydrin and / or glycerin halohydrin while stirring , the temperature is controlled below the reflux temperature, the time is 0.5-2 hours, then the temperature is raised to the reflux temperature, and the temperature is kept for 4-10 hours; the invention is easily soluble in water and alkaline solution, and is applied in the alkaline cyanide-free galvanizing process , The range of current density is wide, the total current of the Hull cell is 3A, the high current area does not burn, and the coating with excellent physical properties and bright mirror surface can be obtained, and the cost is low.
Description
technical field [0001] The invention belongs to a bright additive for electro-galvanizing, in particular to an electro-galvanizing brightening agent suitable for an alkaline cyanide-free zincate electro-galvanizing process and a composition brightening agent composed of the same. Background technique [0002] The galvanizing process is divided into alkaline galvanizing and acid galvanizing. Alkaline galvanizing is divided into cyanide galvanizing and cyanide-free galvanizing. The typical acid galvanizing is chloride galvanizing and sulfate galvanizing. Among them, potassium chloride galvanizing and alkaline cyanide-free zincate galvanizing in chloride galvanizing are two representative cyanide-free galvanizing processes. At present, in order to meet the requirements of environmental protection, these two cyanide-free galvanizing The technology has been developed rapidly and widely used. [0003] In electroplating technology, additives and brighteners are very important. The...
Claims
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Patent Type & Authority Patents(China)
IPC IPC(8): C25D3/22
Inventor 左正勋马冲
Owner JIANGMEN DESHANG KEZUO TECHNOLOGY INDUSTRIAL CO LTD
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