A kind of preparation method of dibutyltin oxide

Abstract

The invention provides a preparation method of dibutyltin oxide. The dibutyltin oxide is at least prepared by (1), synthesis of tetrabutyl tin; (2), synthesis of dibutyl stannous chloride; (3), synthesis of dibutyltin oxide, wherein catalyst used in step (2) is composite of modified nano-crystalline cellulose and aluminium chloride. The dibutyltin oxide is applied to electric paint and electrophoretic paint fields.

Description

technical field [0001] The invention relates to a method for preparing an organotin substance, in particular, the invention relates to a method for preparing dibutyltin oxide. Background technique [0002] At present, the methods for producing organotin at home and abroad mainly include the Grignard method, the Wutz method, the alkyl aluminum method and the direct iodine method. The Grignard method is mostly used in European and American countries. The alkyl aluminum method is also used in East Germany. The direct iodine method is widely used in Japan. The advantage of the Grignard method is that it can control the composition of the product at any time, but there are many steps, and the Grignard reaction is an exothermic reaction, and the boiling point of the solvent is very low, so the temperature and reaction speed must be carefully controlled to avoid explosions; although the iodine method has fewer steps than the Grignard method , but it must be recovered according to...

AI Technical Summary

Problems solved by technology

The production and preparation method of dibutyl tin oxide is prepared by directly dropping dibutyl tin dichloride into lye after liquefaction. The produced product has large particles, uneven particles, and many impurities in the product. It is widely used in the coating industry. It is prone to disadvantages such as poor catalytic effect and obvious coating defects, which make it unable to be used in electrophoretic paint

[0004] Tetrabutyltin is a key intermediate in the production of dibutyltin oxide. Generally, ether is used as a solvent to synthesize tetrabutyltin by the traditional Grignard method. This method has flammable and explosive hazards and certain operational difficulties. Replacing ether with a high boiling point solvent can To achieve a better effect; control the reaction ratio of tetrabutyltin and tin tetrachloride and the appropriate reaction conditions, can synthesize a product with a main content of dibutyltin dichloride exceeding 90%, and the product is distilled to remove butyl trichloride After tin chloride, dibutyl tin dichloride boutique with a main content greater than 98.5% can be obtained; dibutyl tin dichloride reacts with alkali to produce dibutyl tin oxide, because the dibutyl tin oxide produced by the reaction has Hydrophobic, and there are side reactions in the reaction process. In the traditional process, an inert organic solvent is used to help complete the reaction, but the product will be mixed with a small amount of solvent after washing, which will affect the product quality.

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