Cuprous thiocyanate and production method

Abstract

The invention relates to cuprous thiocyanate and a preparation method. Cuprous thiocyanate can be used as antifouling paint and paint used biological poisoning agents. The invention is characterized in that 35-50% thiocyanate water solution and 35-45% copper sulfate or hydrochloride water solution replacement-react under the protection of SO2 or CO, the mol ratio of the three is 1:1:(0.3-0.7), and white powder with grain diameter ranging from 5-25 Mum and white content being 70-80% is obtained. Compared with the prior art, the yield can be improved by 50%, and the yield and the purity can be improved to be above 99%; the output of waste water is small, and only 1-3 t waster water is generated per product; the obtained cuprous thiocyanate has good evenness and small grain diameter range reduced to be 5-25 Mum, the anti-corrosion effect is stable, and the white or off-white powder product greatly improves the commonality of color matching; and the integrated cost is reduced by 20%, thereby overcoming the defect of the prior art.

Description

technical field [0001] The invention relates to an antifouling paint, a biocidal agent for paint—cuprous thiocyanate and a preparation method. Background technique [0002] In order to effectively prevent marine organisms from being fouled by marine organisms such as algae, barnacles, shells, etc. Adhesion, people have developed antifouling coatings with biocides. Previously, the biocides used in antifouling coatings were mostly cuprous oxide. Cuprous oxide is a heavy metal ion that can cause genetic mutations in marine organisms and has been eliminated. Secondly, it is extremely unstable and easily oxidized into basic copper carbonate by air, resulting in the failure of the poisonous effect. Therefore, the shelf life is short, generally only six months. About a month; Moreover, cuprous oxide and aluminum body will produce electrochemical reaction in seawater, so it cannot be used in aluminum body marine equipment such as aluminum hull. [0003] Cuprous Thiocyanate (CuSCN,...

AI Technical Summary

Problems solved by technology

The cuprous thiocyanate obtained by this method has poor particle size uniformity and a wide particle size range between 5-50 μm.

The particle size is uneven, and it is difficult to obtain the required uniform particle size through crushing and reprocessing, which will lead to uneven release of the poisonous active ingredient—cuprous ion, which will affect the antifouling effect; secondly, the cuprous ion contacts the air during the reaction process, It will be partially oxidized into divalent copper, which not only weakens the function, but also makes the color of the obtained cuprous thiocyanate darker, grayish white, and the whiteness is only about 60%, which is not conducive to color matching of paints, resulting in narrow application fields

In this preparation method, because a relatively large amount of salt is added, a large amount of salt will be produced in the reaction. In order to improve the purity of the obtained product, a large amount of water must be used to remove the salt and produce a large amount of saline waste water. Usually, 1 ton of cuprous thiocyanate is produced. 5-10 tons of waste water, and the production efficiency of this method is low, the yield of cuprous thiocyanate obtained is low, the yield is only 90-95%, and the treatment of a large amount of saline waste water will increase the production cost, and the discharge will cause serious pollution if it is not treated. surroundings