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Method for producing uniform lamella zinc pyrithione

A lamella-crystalline zinc pyrithione, uniform technology, applied in the field of producing uniform lamella-crystalline zinc pyrithione, can solve the problem of large particle size of zinc pyrithione, achieve the effect of improving the sterilization effect and increasing the specific surface area

Active Publication Date: 2016-08-31
江苏燎原环保科技股份有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

But the zinc pyrithione particle size that this method obtains is still too big

Method used

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  • Method for producing uniform lamella zinc pyrithione
  • Method for producing uniform lamella zinc pyrithione
  • Method for producing uniform lamella zinc pyrithione

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] The first step: Oxidation reaction: Add 2-chloropyridine, catalyst and deionized water into the reaction kettle, raise the temperature to 55°C, stir for 1h, slowly add hydrogen peroxide dropwise, raise the temperature to 70°C, keep it warm for 4h, then add dropwise hydrogen oxidation Sodium adjusts the pH value to 7.5 to generate 2-chloro-N-oxypyridine solution;

[0033] Its specific reaction is as follows:

[0034]

[0035] The second step: mercaptolation reaction: add sodium hydrosulfide solution and sodium hydroxide solution dropwise to the reaction kettle of the 2-chloro-N-oxypyridine solution in the first step to adjust the pH to 9, and stir at a temperature of 80°C for 2h , generate 2-mercapto-N-oxypyridine solution;

[0036] Its specific reaction is as follows:

[0037]

[0038] The third step: acid stripping reaction: add hydrochloric acid to the reaction kettle of the 2-mercapto-N-oxypyridine solution in the second step, and adjust the pH value to 3;

...

Embodiment 2

[0048]Example 2: Step 1: Oxidation reaction: Add 2-chloropyridine, catalyst and deionized water into the reactor, heat up to 50°C, stir for 1 hour, slowly add hydrogen peroxide dropwise, heat up to 60°C, keep warm for 3 hours, and then Add dropwise sodium hydroxide to adjust the pH value to 6 to generate 2-chloro-N-oxypyridine solution;

[0049] The second step: mercaptolation reaction: add sodium hydrosulfide solution and sodium hydroxide solution dropwise to the reaction kettle of the 2-chloro-N-oxypyridine solution in the first step to adjust the pH to 8, and stir at a temperature of 70°C for 1h , generate 2-mercapto-N-oxypyridine solution;

[0050] The third step: acid stripping reaction: add hydrochloric acid to the reaction kettle of the 2-mercapto-N-oxypyridine solution in the second step, and adjust the pH value to 2;

[0051] The fourth step: salt formation reaction: add sodium hydroxide solution to the solution in the third step to adjust the pH value to 8, and then...

Embodiment 3

[0055] The first step: Oxidation reaction: Add 2-chloropyridine, catalyst and deionized water into the reaction kettle, raise the temperature to 60°C, stir for 2.5h, slowly add hydrogen peroxide dropwise, raise the temperature to 80°C, keep it warm for 5h, and then add hydrogen dropwise Sodium oxide adjusts the pH value to 8 to generate 2-chloro-N-oxypyridine solution;

[0056] The second step: mercaptolation reaction: add sodium hydrosulfide solution and sodium hydroxide solution dropwise to the reaction kettle of the 2-chloro-N-oxypyridine solution in the first step to adjust the pH to 10, and stir at a temperature of 90°C for 3h , generate 2-mercapto-N-oxypyridine solution;

[0057] The third step: acid stripping reaction: add hydrochloric acid to the reaction kettle of the 2-mercapto-N-oxypyridine solution in the second step, and adjust the pH value to 4;

[0058] The fourth step: salt formation reaction: add sodium hydroxide solution to the solution in the third step to ...

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Abstract

The invention provides a method for producing uniform lamella zinc pyrithione. The method comprises the following steps: first step: adding 2-chloropyridine, a catalyst and deionized water in a reaction kettle, slowly dropwise adding hydrogen peroxide, and generating a 2-chloro-N-pyridine oxide solution; second step: dropwise adding a sodium hydrosulfide solution and a sodium hydroxide solution in the reaction kettle with the 2-chloro-N-pyridine oxide solution obtained from the first step to generate a 2-sulfydryl-N-pyridine oxide solution; third step: adding hydrochloric acid in the reaction kettle with the 2-sulfydryl-N-pyridine oxide solution obtained from the second step; fourth step: adding a sodium hydroxide solution in the solution obtained from the third step and adjusting pH value to be 8-10; and fifth step: adding a ZnSO4 solution in the reaction kettle with 2-sulfydryl-N-pyridine oxide sodium salt obtained from the fourth step to obtain the lamella zinc pyrithione. The small-grain-size lamella zinc pyrithione with uniform particles plays a quite important role in application in the aspects of civil coating, biocide mildewcide and the like.

Description

technical field [0001] The invention relates to a method for producing uniform lamella zinc pyrithione. Background technique [0002] Zinc pyrithione (ZPT), also known as pyridinium zinc, pyrithione zinc or omadine zinc, can be used as a preservative, antifouling agent, antifungal agent and anti-dandruff agent, etc., and is widely used in agriculture , industry, medicine and health and cosmetics and other fields. Because zinc pyrithione has anti-dandruff effect, has the function of inhibiting abnormal cell growth and antimicrobial effect, has strong penetrating power, and can delay hair aging, reduce hair loss, and delay the time of gray hair generation. Therefore, ZPT is widely used in skin cleansers, and can also be used as an anti-dandruff and antipruritic agent for advanced shampoos. [0003] At present, the commercially available zinc pyrithione products generally have larger particle sizes, and some products with smaller particle sizes are obtained by mechanical slic...

Claims

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Application Information

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IPC IPC(8): C07D213/70
CPCC07B2200/13C07D213/70
Inventor 成涛赵忠勇郑兆金曹阳谢宇健赵胜王鹏冯启华莫东
Owner 江苏燎原环保科技股份有限公司
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