Alkaline zincate zinc plating brightener for electric heating tube electroplating

Alkaline zincate zinc plating brightener for electric heating tube electroplating

Brightener and ZD-93 alkaline zincate zinc plating brightener are mainly composed of DPE-3 and ZB-80 in different concentration ratios. Of course, the DPE and DE additives currently used are not necessarily products from the 1970s. For DPE-3 alone, the earliest ones were synthesized at around 50 ℃ with dimethylaminopropylamine, ethylenediamine, and epichlorohydrin. Some of the above three substances were used for condensation reactions at 40 ℃. At present, there are many methods for synthesizing DPE additives. For example, DPE used in HT and zD-93 is synthesized by reacting imidazole, methylamine, and epichlorohydrin. Similarly, the carrier brightener in WD-90A is also a compound of imidazole, methylamine, and epichlorohydrin, but the molar ratio and synthesis conditions are different. The properties of DPE-3 mentioned above are closer to those of DE additives, and can be seen as an improvement of DE additives; The more famous ZB-80 brightener is still a quaternary ammonium salt formed by the addition of niacin and chloride. Due to different molar ratios, catalysts used for synthesis, and additional components, ZB-80 can also be colorless to red. If carrier brighteners such as DPE and DE are quaternized, they will have more surface activity, and their brightness, deep plating ability, and dispersion ability are better than those without quaternization. Therefore, further quaternization or acetylation of the condensate of organic amines and epichlorohydrin can result in better results when used as a carrier brightener.

As the synthesis and selection of carrier brighteners is a crucial task in the development of alkaline zincate zinc plating brighteners, carrier brighteners that have not undergone quaternization reactions can achieve the same goal by adding pre synthesized auxiliary brightener quaternization products. Another method can generate polymers by reacting imidazole and formaldehyde with epoxy propane. This substance is a monomer short chain cyclic compound with very stable performance and is not easily decomposed under high temperature and electrolysis. All performance indicators are better than DPE-3; Alternatively, Miwa can react with epichlorohydrin first and then further synthesize with halogenated organic acids. This additive itself is a universal brightener for alkaline zinc plating, which can be used as both a carrier brightener and a main brightener. It has good brightening effects in cyanide zinc plating and alkaline zinc salt zinc plating.

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