New crystalline pyrithione/zinc oxide complex and physiologic/antibiotic active composite containing the same
A zinc oxide, new crystal technology, applied in the field of antiseptic and anti-mildew compositions, anti-dandruff and hair-growing compositions, and physiological/anti-biologically active compositions, can solve the problems of not forming complexes, and achieve excellent gels The effect of the suppression effect
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Embodiment 1
[0083] In a 5 L flask, 276.7 g of zinc pyrithione powder (manufactured by Arch Chemicals, Inc) and 70.7 g of ultrafine particle zinc oxide having an average particle diameter of 0.03 μm were added to 3500 mL of water. The resulting mixture was adjusted to pH 12 with 1% aqueous sodium hydroxide solution, and then stirred at 90° C. for 10 minutes. Once cooled, adjust to pH 9.5 with 5% hydrochloric acid, then stir for 2 hours while maintaining at 80°C. After cooling, the mixture was filtered through No. 2 filter paper. Put the wet solid left on the filter paper back into the container, repeat the operation of washing and filtering until the filtrate becomes clear. The obtained wet solid was dried and filtered at 50° C. for 5 hours to obtain 340.4 g of white powder. The result of differential thermal analysis (heating rate: 10°C / min) of this white powder is as follows Figure 9 shown. The exothermic peak temperature was 301.6°C (corrected). Compared with the raw material zinc...
Embodiment 2
[0087] In a 200mL beaker, add 4.8g of zinc pyrithione powder (made by Kolon Life Science Inc.) and 0.6g of ultrafine particle zinc oxide (the mol ratio of zinc pyrithione: ultrafine particle zinc oxide=2:1) with an average particle diameter of 0.03 μm ) (manufactured by Tayca), to which 100 mL of distilled water was added. The resulting mixture was adjusted to pH 8.0 with 1% aqueous sodium hydroxide solution. The aqueous slurry thus obtained was stirred at 20°C for 30 minutes, and the solid was collected by filtration through No. 2 filter paper. The solid thus obtained was washed twice with 50 mL of distilled water, and dried at 50° C. for 5 hours to obtain 5.1 g of a white powder. The results obtained by differential thermal analysis (heating rate: 10°C / min) of the white powder are as follows Figure 10 shown. The exothermic peak temperature was 303.9°C (corrected). A composite of zinc pyrithione and ultrafine particle zinc oxide with a molar ratio of 0.5 (x=0.5) relati...
Embodiment 3
[0095] In a 500mL flask, add 20g of zinc pyrithione powder (manufactured by API) and 1.3g of ultrafine zinc oxide (manufactured by Tayca) with an average particle diameter of 0.03 μm (manufactured by Tayca) in 250mL of water (zinc pyrithione: ultrafine zinc oxide molar ratio = 4:1). The resulting mixture was adjusted to pH 12 with 1% aqueous sodium hydroxide solution, and then stirred at 90° C. for 10 minutes. Once the mixture was cooled, it was adjusted to pH 9.5 with 5% hydrochloric acid, then stirred while maintaining at 80°C for 2 hours. After cooling, the mixture was filtered through No. 2 filter paper. Similar to Example 1, the operations of washing with water and filtering were repeated until the filtrate became clear. The solid thus obtained was dried at 50°C for 5 hours to obtain 20.8 g of a white powder. As a result of differential thermal analysis (heating rate: 10° C. / min) of this white powder, the exothermic peak temperature was 294.7° C. (after correction). I...
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