Preparation method of BBI

Abstract

The invention provides a preparation method of BBI, which includes the following steps: pouring sodium hydroxide and water into a reaction kettle which is provided with an electric mixer, a thermometer and a reflux condenser; after the sodium hydroxide is fully dissolved and the temperature thereof rises to 50 to 57 DEG C, adding benzsulfamide, and controlling the temperature between 53 to 57 DEGC; after the benzsulfamide is fully dissolved, starting to dropwise add benzene sulfonyl chloride; after dropwise adding for 30 minutes, refilling sodium hydroxide solution, and maintaining the PH value between 8 and 9; after finishing dropwise adding the benzene sulfonyl and carrying out heat insulation reaction for 2 to 4 hours, again rising the temperature to 100 to 105 DEG C; and back flowing for 1 hour, reducing the temperature to 26 to 30 DEG C, using hydrochloric acid to adjust the pH value between 4.0 to 7.5, and separating the solid-liquid mixtures by a centrifugal machine. The invention adopts the method of adding alkali to separate out the sodium salt of BBI directly from the filter liquor, while the benzsulfamide has better solubility in alkali liquor so that the benzsulfamide can not be separated out together with the sodium salt of BBI, and thereby the product with high purity and good dissolubility can be obtained.

Description

technical field [0001] The invention relates to a preparation method of an electroplating nickel additive, more specifically a preparation method of bisbenzenesulfonimide. Background technique [0002] With the development of society, people's pursuit of life is getting higher and higher. In the electroplating industry, the requirements for nickel plating are getting higher and higher, not only durable but also beautiful. In the modern nickel plating process, saccharin, a commonly used additive, is a very good leveler and softener, but only using saccharin as a leveler and softener will cause the coating to turn yellow, which requires a new electroplating intermediates to solve this problem. [0003] Bisbenzenesulfonimide (hereinafter referred to as BBI) is exactly a kind of electroplating intermediate that can replace 90% of saccharin without causing yellowing of the coating, and its consumption is small and the cost is low. At present, there are many domestic enterprise...

AI Technical Summary

Problems solved by technology

At present, there are many domestic companies producing BBI, but there is a common problem of poor solubility, which leads to the accumulation of a large amount of insoluble matter in the plating tank, and ultimately affects the quality of the coating and the efficiency of electroplating.

Among foreign companies, German products are the best, which solves the problem of solubility, but their selling price is also the highest, which greatly increases the cost of Chinese companies, and Germany’s BASF’s BBI-related technologies have completely blocked China

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