Method for preparing pyrithione salt dispersed solution by injection coprecipitation method

A technology of pyridinethione salt and co-precipitation method is applied in the field of preparation of high-quality pyridinethione salt dispersion liquid, and can solve the problems of large particle size and wide particle size distribution.

Active Publication Date: 2012-03-28
SOUTHEAST UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0012]Technical problem: The purpose of the present invention is to provide a method for preparing pyrithione salt dispersion by jet co-precipitation method, which is mainly used to solve the problem of existing production of pyrithione salt In the technology of dispersion liquid, pyrithione salt particles are larger and the particle size distribution is wider. Compared with the existing production technology, this method does not need to use physical means such as grinding, crushing, ultrasonic strengthening, etc., but by using Jet reactor with millisecond-level physical mixing time can prepare pyrithione salt dispersion with narrow particle size distribution and average particle size of 0.1-10 microns

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  • Method for preparing pyrithione salt dispersed solution by injection coprecipitation method
  • Method for preparing pyrithione salt dispersed solution by injection coprecipitation method
  • Method for preparing pyrithione salt dispersed solution by injection coprecipitation method

Examples

Experimental program
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Effect test

Embodiment 1

[0032] Adopt coaxial jet type jet reactor to prepare pyrithione copper dispersion liquid, the outer tube of jet reactor is the round tube of inner diameter 10mm, the inner sleeve pipe of coaxial jet is arranged at the inlet center of jet reactor, the inner sleeve pipe The diameter is 3mm, and the length from the outlet of the inner casing to the outlet of the jet reactor is 50mm. The outlet of the jet reactor is above the liquid level of the stirred reactor. The stirred reactor is a standard type stirred tank, and its effective volume is 200L, the stirred tank adopts continuous operation.

[0033] The laser-induced fluorescence technique was used to evaluate the physical mixing time of two streams of water in a coaxial jet-type jet reactor. Laser-induced fluorescence technology is an advanced quantitative evaluation method for evaluating fluid mixing effects. Its main principle is to use some fluorescent substances (such as rhodamine B, rhodamine 6G, acetone, etc.) Visible li...

Embodiment 2

[0037] The zinc pyrithione dispersion was prepared by using a small-hole jet jet reactor. The central tube of the jet reactor was a circular tube with an inner diameter of 20 mm, and six small diameter tubes with a diameter of 3 mm were evenly distributed on the tube wall at a distance of 50 mm from the entrance of the circular tube. The hole, the distance from the small hole to the outlet of the jet reactor is 300mm. The outlet of the jet reactor is located above the liquid level of the stirred reactor. The stirred reactor is a standard type stirred tank with an effective volume of 50L. The stirred tank Use intermittent operation. The same laser-induced fluorescence technique as in Example 1 was used to evaluate the physical mixing time of the small-hole jet jet reactor for two streams of water. In the jet reactor, the time for the two fluids to reach 95% physical mixing was 7.7 milliseconds.

[0038] Stream A is an aqueous solution of zinc sulfate, which enters the jet react...

Embodiment 3

[0041] Adopt impingement flow jet reactor to prepare magnesium pyrithione dispersion, the impingement mixing zone is a circular tube with an internal diameter of 30mm, and the length is 20mm, and two liquid nozzles are symmetrically placed on the tube wall of the impingement mixing zone, stream A and stream Strand B enters the liquid nozzle through the feed pipe connected to the two liquid nozzles, and after being sprayed out from the nozzle, it mixes and reacts in the impact mixing area. A circular tube with a length of 50mm and an inner diameter of 15mm is connected to the lower part of the impact mixing area. , the mixed reaction solution enters the connected reaction tube through the impact mixing zone for further reaction, and then it is discharged into the stirred tank. The outlet of the jet reactor is located above the liquid level of the stirred reactor. The stirred reactor is a standard type stirred tank. The effective volume is 20L, and the stirred tank adopts intermi...

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Abstract

The invention relates to a method for preparing a pyrithione salt dispersed solution by an injection coprecipitation method, which comprises the following specific steps: a water-soluble salt of pyrithione or pyrithione acid, i.e. a stream A and a water-soluble polyvalent metal salt, i.e. a stream B, are simultaneously led into an injection reactor for fast mixing and reacting, wherein the injection reactor is a tubular reactor, and the stream A and the stream B respectively enter the injection reactor from two feeding holes of the injection reactor; a reacting solution obtained from an outlet of the injection reactor is continuously led into a stirred tank reactor for carrying out further reaction, wherein a surfactant is at least added, the reaction temperature in the injection reactor and the stirred tank reactor is 0-90 DEG C, and the stirred tank reactor can be adopted to intermittently operate or continuously operate; and the pyrithione salt dispersed solution is obtained from the inside of the intermittently-operating stirred tank reactor or the outlet of continuously-operating stirred tank reactor after finishing reacting. The pyrithione salt dispersed solution prepared through the method provided by the invention has the advantages of narrow particle size distribution, small mean particle diameter, good dispersive property and the like.

Description

technical field [0001] The present invention specifically relates to a method for preparing a high-quality pyrithione salt dispersion, in particular, to a method for controlling the preparation of a pyrithione salt dispersion with narrow particle size distribution and good dispersibility by means of a spray co-precipitation method. method. Background technique [0002] Pyridinethione (also known as 2-mercaptopyridine-N-oxide; 1-hydroxy-2-pyridinethione; 2-pyridinethiol-1-oxide) is a polyvalent metal salt recognized as a broad-spectrum, Low-toxic, environmentally friendly antifungal agent and antifungal agent are widely used in civil coatings, adhesives, carpets and personal care products. They can also be used in ship antifouling paints to prevent crustaceans, seaweeds and aquatic organisms from adhering to hull panels. Polyvalent metal salts of pyrithione are only slightly soluble in water and most organic solvents, including zinc pyrithione, copper pyrithione, magnesium p...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07D213/89
Inventor 骆培成项国兆焦真赵素青
Owner SOUTHEAST UNIV
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