Ultra-fine particles of zinc oxide, method for preparing the same and cosmetic comprising the same

A technology of ultra-fine particles and manufacturing methods, which is applied in the direction of zinc oxide/zinc hydroxide, cosmetics, cosmetics, etc., can solve the problems of particle size, uneven particle size, decreased purity, high cost, etc., and achieve high light transmittance and whiteness , the effect of good characteristics

Inactive Publication Date: 2002-04-03
SHOWA DENKO KK
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In the process of crushing and crushing, it is inevitable that impurities will be mixed in due to the wear and tear of the machine in the processing process, which will reduce the purity and inevitably become a powder with uneven particle size and particle size.
For this reason, when used as a makeup material, etc., the touch is poor
In addition, since a large amount of crushing energy is required, the cost is also high

Method used

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  • Ultra-fine particles of zinc oxide, method for preparing the same and cosmetic comprising the same
  • Ultra-fine particles of zinc oxide, method for preparing the same and cosmetic comprising the same
  • Ultra-fine particles of zinc oxide, method for preparing the same and cosmetic comprising the same

Examples

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Effect test

Embodiment 1

[0060] Ultrafine particle zinc oxide was produced using the reaction apparatus shown in FIG. 1 above (the same applies to Examples 2 to 4 described later).

[0061] Heat a container with a large heat transfer area that can obtain a metal zinc evaporation of 9kg / hr to 1150°C, and use 4Nm of nitrogen as a carrier gas 3 / hr was blown into it, and it was introduced from the nozzle 1 to the reaction tube in a state of keeping warm. On the other hand, the air flow rate of 20Nm 3 / hr, 700cc / hr of water was heated to 1100°C, introduced into the reaction tube from the nozzle 2, and reacted with the above-mentioned raw material gas. When the white powder thus obtained was analyzed by X-ray diffraction, it was found to be Zincite, and it was confirmed to be zinc oxide. The detailed fabrication conditions are shown in Table 1.

[0062] Table 2 shows the physical properties of the ultrafine particle zinc oxide thus obtained (implementation material 1).

Embodiment 2

[0064] A vessel with a large heat transfer area to obtain a metallic zinc evaporation of 4 kg / hr was heated to 1100°C. Nitrogen 1Nm as carrier gas 3 / hr was blown into it, and it was introduced from the nozzle 1 to the reaction tube in a state of keeping warm. On the other hand, the oxygen flow rate is 40Nm 3 / hr, 6 liters / hr of water was heated to 1100°C, introduced into the reaction tube from the nozzle 2, and reacted with the above-mentioned raw material gas. When the white powder thus obtained was analyzed by X-ray diffraction, it was found to be Zincite, and it was confirmed to be zinc oxide. The detailed fabrication conditions are shown in Table 1.

[0065] Table 2 shows the physical properties of the ultrafine particle zinc oxide thus obtained (implementation material 2).

Embodiment 3

[0067] A vessel with a large heat transfer area capable of obtaining a metallic zinc evaporation of 10 kg / hr was heated to 1100°C. Nitrogen 2Nm as carrier gas 3 / hr was blown into it, and it was introduced from the nozzle 1 to the reaction tube in a state of keeping warm. On the other hand, the oxygen flow rate of 120Nm 3 / hr, 15 liters / hr of water was heated to 1150°C, introduced into the reaction tube from the nozzle 2, and reacted with the above-mentioned raw material gas. When the white powder thus obtained was analyzed by X-ray diffraction, it was found to be Zincite, and it was confirmed to be zinc oxide. The detailed fabrication conditions are shown in Table 1.

[0068] Table 2 shows the physical properties of the ultrafine particle zinc oxide thus obtained (implementation material 3).

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Abstract

Ultra-fine particles of zinc oxide which have a specific surface area of 10 to 200 m<2>/g as measured by one point BET method, have primary particles being substantially isotropic with respect to the form thereof, characterized in that it has a specific volume of 4 to 40 ml/g as measured by means of a tapping machine; a method for preparing the same; and a cosmetic comprising the same. The ultra-fine particles have a reduced degree of aggregation of primary particles and thus can be extremely easily dispersed into and suspended in an aqueous solvent with no pulverization steps or through a simple dry pulverization, can be suitably used, for example, as a powder for a cosmetic, and further have both of feeling of transparency and ultraviolet ray-shielding function.

Description

[0001] This application is claimed under US Application Serial No. 60 / 121,435 (filed February 23, 1999). technical field [0002] The present invention relates to an ultrafine particle zinc oxide, its production method and a cosmetic material using the above ultrafine particle zinc oxide. That is, the degree of aggregation can be reduced to such an extent that it can be easily dispersed and suspended in an aqueous medium. It is suitable for use as a powder for cosmetic materials, and has both transparency and ultraviolet shielding ability. Background technique [0003] In the past, various kinds of zinc oxide powders have been sold on the market, and they have been used as extenders and the like to be blended into cosmetic materials and the like. Known methods for producing these zinc oxide powders generally include a liquid-phase method and a gas-phase method. In the liquid-phase method, zinc oxalate, zinc hydroxide, basic zinc carbonate, etc. are synthesized in a liquid ph...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): A61K8/25A61K8/27A61Q1/02A61Q17/04A61Q19/00C01G9/02C01G9/03C09C1/04
CPCC01P2006/12C09C1/043A61K8/27A61Q19/00A61Q1/02A61Q17/04A61K8/25C01G9/03C01G9/02C01P2004/64C01P2006/62
Inventor 小古井久雄田中淳山谷勇登
Owner SHOWA DENKO KK
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