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Silicon oxide-coated zinc oxide and method for preparing same, and composition and cosmetic material containing silicon oxide-coated zinc oxide

A cosmetic material, zinc oxide technology, applied in the direction of zinc oxide/zinc hydroxide, silicon oxide, silicon dioxide, etc., can solve the problem that it is difficult to fully inhibit the dissolution of zinc ions, and achieve the effect of inhibiting dissolution

Active Publication Date: 2017-08-01
SUMITOMO OSAKA CEMENT CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0009] However, the methods described in Patent Documents 3 and 4 also have the problem that it is difficult to sufficiently suppress the elution of zinc ions derived from zinc oxide.

Method used

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  • Silicon oxide-coated zinc oxide and method for preparing same, and composition and cosmetic material containing silicon oxide-coated zinc oxide
  • Silicon oxide-coated zinc oxide and method for preparing same, and composition and cosmetic material containing silicon oxide-coated zinc oxide
  • Silicon oxide-coated zinc oxide and method for preparing same, and composition and cosmetic material containing silicon oxide-coated zinc oxide

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preparation example Construction

[0087] In the preparation of the zinc oxide aqueous suspension, the zinc oxide particles having an average primary particle diameter of more than 50nm and not more than 500nm are mixed with water, and then the zinc oxide particles are uniformly dispersed in the water to prepare the zinc oxide particle-containing zinc oxide suspension. Zinc aqueous suspension.

[0088] In order to increase reactivity with alkali metal silicate, the content of zinc oxide particles in the zinc oxide aqueous suspension is preferably 20% by mass to 60% by mass, more preferably 25% by mass to 55% by mass.

[0089] The method for dispersing the zinc oxide particles in water is not particularly limited, and for example, an ultrasonic dispersion method, a stirring method, or the like can be used.

[0090] Next, the zinc oxide aqueous suspension and the silicate alkali metal salt aqueous solution containing the silicate alkali metal salt are mixed and stirred to prepare an aqueous suspension containing ...

Embodiment 1

[0205] [Silicon oxide coated zinc oxide]

[0206] Zinc oxide particles (average particle size: 250 nm; manufactured by Sumitomo Osaka Cement Co., Ltd.) were mixed with water, followed by ultrasonic dispersion to prepare zinc oxide particles with a zinc oxide content of 50% by mass. Zinc aqueous suspension.

[0207] Next, the zinc oxide aqueous suspension was added to contain 17.7% by mass in terms of silicon oxide (15% by mass of silicon oxide in silicon oxide-coated zinc oxide) with respect to the mass of zinc oxide particles in the zinc oxide aqueous suspension. sodium silicate in an aqueous solution of sodium silicate and stirred to make a suspension.

[0208] Next, the suspension was heated to 60° C., and the pH was adjusted to 6 by gradually adding dilute hydrochloric acid while stirring the suspension. Thereafter, it was left still for 2 hours, and an aqueous calcium chloride solution (50% by mass of calcium chloride dihydrate) having the same mass as that of the zinc ...

Embodiment 2

[0214] [Silicon oxide coated zinc oxide]

[0215] Zinc oxide particles (average particle diameter: 250 nm; manufactured by Sumitomo Osaka Cement Co., Ltd.) were mixed with water, followed by ultrasonic dispersion to prepare a zinc oxide aqueous suspension having a zinc oxide content of 30% by mass.

[0216] Next, the zinc oxide aqueous suspension was added to contain 17.7% by mass in terms of silicon oxide (15% by mass of silicon oxide in silicon oxide-coated zinc oxide) with respect to the mass of zinc oxide particles in the zinc oxide aqueous suspension. sodium silicate in an aqueous solution of sodium silicate and stirred to make a suspension.

[0217] Next, the suspension was heated to 60° C., and the pH was adjusted to 6 by gradually adding dilute hydrochloric acid while stirring the suspension. Thereafter, it was left still for 2 hours, and an aqueous calcium chloride solution (50% by mass of calcium chloride dihydrate) having the same mass as that of the zinc oxide par...

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Abstract

The present invention provides: a silicon oxide-coated zinc oxide in which the elution of zinc ions is suppressed even when the zinc oxide is coated with silica formed from an alkali metal silicate salt; a method for preparing the same; and a composition and a cosmetic material which contain the silicon oxide-coated zinc oxide. This silicon oxide-coated zinc oxide is formed by coating the surfaces of zinc oxide particles with a silicon oxide film, wherein the average primary particle diameter of the zinc oxide particles is over 50 nm to 500 nm, and when the silicon oxide-coated zinc oxide is kept for one hour in a buffer solution having a pH of 5, the elution rate S, defined by equation (1), of zinc oxide is 50% or less. (1) Elution rate S = (amount of eluted zinc oxide) / (amount of zinc oxide in silicon oxide-coated zinc oxide).

Description

technical field [0001] The present invention relates to silicon oxide-coated zinc oxide and its production method, a composition containing silicon oxide-coated zinc oxide, and a cosmetic material. [0002] This application claims priority based on Japanese Patent Application No. 2014-230654 filed in Japan on November 13, 2014 and Japanese Patent Application No. 2015-141392 filed in Japan on July 15, 2015, and the contents thereof are incorporated herein . Background technique [0003] Since zinc oxide has photocatalytic activity, when it is used in cosmetics, it is complicated to strictly select the compounding amount and other compounding components that coexist. Therefore, surface-coated zinc oxide has been proposed in which the surface of zinc oxide is coated with a low-activity material such as silicon oxide or aluminum oxide for the purpose of suppressing the photocatalytic activity of zinc oxide (see, for example, Patent Documents 1 and 2). [0004] In recent years,...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01G9/02A61K8/27A61Q1/04A61Q1/08A61Q1/10A61Q17/04A61Q19/00
CPCA61K8/27A61Q1/04A61Q1/08A61Q1/10A61Q17/04A61Q19/00A61K2800/412A61K2800/621A61K8/0241A61K8/25A61K2800/651A61Q1/02C01B33/12C01G9/02C01P2004/84C01P2004/64C01P2004/62A61K2800/61A61K8/0245C01P2004/82C09C1/043
Inventor 须磨俊辅板垣哲朗松下浩和
Owner SUMITOMO OSAKA CEMENT CO LTD