Pyridinethione salt and preparation method thereof
A technology of pyrithione salt and pyrithione, which is applied in the field of pyrithione salt and its preparation, can solve the problems of small particles, and achieve the effect of not easy to lose, strong function, and strong anti-dandruff
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Embodiment 1
[0015] The preparation of embodiment 1 zinc pyrithione particles
[0016] In a 500 ml four-neck flask, 100 g of 20% sodium pyrithione solution and 1.0 g of a dispersant (commercially available polymeric alkylnaphthalene sulfonic acid sold under the trade name DARVAN-1 from R.T. Vanderbilt & Company) were added. sodium salt). The temperature was raised to 50°C and maintained at this temperature throughout the reaction, maintaining a pH of 6-7. The stirring speed was set at about 100 rpm. Use a peristaltic pump to pump 125 g of 10% zinc sulfate monohydrate aqueous solution into the four-necked flask within 30-35 minutes. The product slurry was isolated by filtration through a Buchner funnel and washed with water. 90% of the particles in the product are flakes, and the particle size ranges from 1 to 6 μm.
[0017] Through microscope or electron microscope observation, it is found that the separated product is composed of flaky zinc pyrithione particles, and the electron micro...
Embodiment 2
[0018] The preparation of embodiment 2 zinc pyrithione particles
[0019] In a 500 ml four-neck flask, add 100 g of 20% sodium pyrithione solution and 0.2 g of a dispersant (the sodium salt of polymerized alkylnaphthalene sulfonic acid commercially available from R.T. Vanderbilt & Company sold under the trade name DARVAN-1 ). The temperature was raised to 50°C and maintained at this temperature throughout the reaction, maintaining a pH of 6-7. The stirring speed was set at about 100 rpm. Use a peristaltic pump to pump 135 g of 10% zinc acetate aqueous solution into the four-necked flask within 30-35 minutes. The product slurry was isolated by filtration through a Buchner funnel and washed with water. 88% of the particles in the product are cubic, and the particle size ranges from 1 to 5 μm.
[0020] Observed by microscope or electron microscope, it is found that the separated product is composed of cubic zinc pyrithione particles, and the electron microscope photos are sho...
Embodiment 3
[0021] The preparation of embodiment 3 zinc pyrithione particles
[0022] In a 500ml four-neck flask, add 130g of potassium pyrithione aqueous solution (wherein water is 50g, potassium pyrithione is 80g, 0.48mol) and 25g dispersant (sold under the trade name DARVAN-1, by R.T.Vanderbilt & Company commercially available sodium salts of polymeric alkylnaphthalenesulfonic acids). The temperature was raised to 100°C and maintained at this temperature throughout the reaction, maintaining a pH of 4 to 6. The stirring speed was set at about 100 rpm. Use a peristaltic pump to pump 58 g of zinc chloride aqueous solution (wherein water is 25 g, zinc chloride is 33 g, 0.24 mol) into the four-necked flask within 30-35 minutes. The product slurry was isolated by filtration through a Buchner funnel and washed with water. 80% of the particles in the product are flaky, and the particle size ranges from 5 to 10 μm.
[0023] Observing with a microscope or an electron microscope, it is found ...
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Abstract
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