The cautions of using pyrithionc zinc

Pyrithionc zinc can effectively inhibit cells keratosis speed, essentially blocking the dandruff production, In addition, because it insoluble in surfactant system, after washing hair with containing pyrithionc zinc shampoo, there are still parts of pyrithionc zinc adsorbed on the surface of the scalp, make the anti-dandruff and antipruritic effect is more durable. It can also melt the generated dandruff as invisible fine particles.Pyrithionc zinc is stability in the range of shampoo required PH and manufacturing temperature range, can be mixed use with the vast majority of shampoo ingredients.

Before using the pyrithionc zinc, the product is necessary for through at least 10 minutes vibration or stirring to make the product mixed. Adjusting the amount of each batch, if possible, each batch count should be added in an amount in barrels, and sometimes when a barrel is only a part, the solid dried and meet condensation on the casks sides, while moving up and down, the condensation product will sink in the remaining product and obtain in final products. Keep container sealed, moisture evaporation will change the content of products, resulting in the formulation added incorrect amount.

Pyrithionc zinc is a chelate compound, insoluble in water, but can be dispersed in the emulsion, melting point is 240, relative density is 1.782. It has a strong killing and inhibit reproductive capability to bacteria, as a preservative, also can anti-seborrhea, can reduce the metabolism of the skin, the use amount is generally not more than 2%. Because it does not dissolve in water, so it is necessary suspended by pyrithionc zinc suspension, can be used TAB-2 and so on. While use, can be mixed pyrithionc zinc and water with 1:1, and added in the production tail. The deficiency of pyrithione zinc is the poor solubility and eye irritation.

Shampoo containing pyrithionc zinc can not be added EDTA, EDTA can chelate with the zinc of pyrithionc zinc, generating pyrithione ions and EDTA chelates, pyrithione ions react with iron ions can form colored compounds, impact shampoo color, whether other chelating agents can be joined should be decided to the experiment. Ferric ions react with pyrithionc zinc generated colored compounds, such as shampoos contain a small amount of trivalent iron ions, can be through the method of first adding a small amount of zinc salt, such as zinc oxide or zinc chloride, make the zinc ion content 4 times (generally at 4 to 10 times) more than iron ion content to avoid generating a trivalent pyrithione ketones. In the production process should avoid using iron, copper containers and equipment. Device can use porcelain pond pure 316 stainless steel pot or pan. Recommended not use contain iron ions or low iron ions content cosmetic material.

Pyrithionc zinc has been developed for many years, by long-term use and isotope tracking prove that it used as a high grade anti-dandruff shampoos additive, only adsorbed on the surface of the skin, and do not penetrate through the stratum corneum to flesh, with high security, use the conventional volume is non-toxic to humans, long-term use without side effects, internationally recognized as an efficient and safe ainti-dandruff antipruritic. But most manufacturers produce small particle size pyrithionc zinc, the pyrithione sodium synthesized by conventional method added into pearlescent shampoo will cover the shampoo’s pearly lustret, affect shampoo appearance. The pyrithione sodium thorugh special process synthesizing pyrithione zinc, the particle size is moderate, an average particle size is about 2um, adding to pearlescent shampoo does not affect the pearly lustre effect, do not settle.

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