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Composite powder and method for producing same

A technology of composite powder and manufacturing method, which is applied in the direction of chemical instruments and methods, pharmaceutical formulas, and cosmetic preparations, etc. It can solve the problems of skin shielding, deterioration of ultraviolet shielding efficiency, and destruction of chemical bonds of other components, and achieve surface activity. Excellent effect of inhibition and storage stability

Active Publication Date: 2014-05-28
SAKAI CHEM IND CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] However, when compounding inorganic powders into plastics, inks, cosmetics, etc., there may be problems that the inorganic powder itself reacts with other compounding materials, or other components are destroyed due to the catalytic activity of the inorganic powders. chemical bonding; etc.
However, ultraviolet shielding titanium dioxide and zinc oxide exist in silicon dioxide, so for sunscreens mixed with them, there are gaps between silicon dioxide particles and silicon dioxide particles, making it difficult to evenly apply to the skin. The problem of UV shielding
In addition, there is also a disadvantage that the ultraviolet shielding efficiency is deteriorated due to the increase in the amount of silica

Method used

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  • Composite powder and method for producing same
  • Composite powder and method for producing same
  • Composite powder and method for producing same

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0092] Add 20g of polyether-modified silicone (KF-6011: manufactured by Shin-Etsu Chemical Industry: HLB 14.5) to 500mL of pure water, and further add zinc oxide (FINEX- 50S-LP2) 100g, mix and disperse. Add 27.5ml (as SiO 2 The amount is 11.1g, which is 10% by weight of the whole powder body after treatment) of sodium silicate aqueous solution (SiO 2 : 403.9g / L, Na 2 O: 130.7g / L), stirring for more than 20 minutes. Then, liquid temperature was made into 70 degreeC. A certain amount of dilute sulfuric acid is added dropwise for neutralization. When performing this neutralization, the amount of sulfuric acid added dropwise was adjusted so that the state of pH 8.5 or higher was maintained for 90 minutes or longer, and neutralization was performed until pH 6.5±0.5. After completion of neutralization, aging was carried out at a liquid temperature of 70° C. for 1 hour. Thereafter, filtration and water washing were performed. The obtained water-washed cake was dried to obtain ...

Embodiment 2

[0094] Zinc oxide treated with 4% hydrogenated dimethicone (FINEX-50S-LP2) was changed to zinc oxide treated with 7% hydrogenated dimethicone (FINEX-50-LPT: Sakai Chemical Industry Co., Ltd.), except that, a composite powder 2 was obtained in the same manner as in Example 1.

Embodiment 3

[0096] Add 20g of polyether-modified silicone (KF-6011: manufactured by Shin-Etsu Chemical Industry: HLB 14.5) to 500mL of pure water, and further add zinc oxide (FINEX- 50-LPT) 100g, stirred to disperse. After this dispersion liquid is heated up to 70 ℃, prepare sodium silicate aqueous solution 27.5ml (the SiO in the solution 2 The amount is 11.1 g, which is 10% by weight of the whole powder after treatment) and dilute sulfuric acid, which were dropped into the above-mentioned dispersion liquid respectively. When performing this dropwise addition, the dropwise amount was adjusted so that the pH was kept stable in the range of 5.5 to 7.5, and it was adjusted so that the dropwise end time would be 2 hours later. After completion of the dropwise addition, aging was performed for 1 hour while maintaining the liquid temperature at 70°C. Thereafter, filtration and water washing were performed, and the obtained water-washed cake was dried to obtain composite powder 3 .

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Abstract

Provided is a composite powder that is stable even when present in water for a long period of time. The composite powder results from forming, on the surface of an inorganic powder, a first coating layer comprising a water-repellant organic compound, and a second coating layer formed on the first coating layer and comprising at least one compound selected from the group consisting of silicon dioxide, a hydrate of silicon dioxide, an oxide of aluminum, and a hydroxide of aluminum.

Description

technical field [0001] The invention relates to a composite powder and a manufacturing method thereof. Background technique [0002] Inorganic powders are often used as fillers, colorants, etc. In recent years, materials that impart new functions such as ultraviolet shielding, thermal radiation shielding, and catalytic functions have also been developed through particle control technology. [0003] However, when compounding inorganic powders into plastics, inks, cosmetics, etc., there may be problems that the inorganic powder itself reacts with other compounding materials, or other components are destroyed due to the catalytic activity of the inorganic powders. chemical bonding; and so on. Titanium dioxide, zinc oxide, etc., in particular, are known to promote resin deterioration due to surface catalytic activity. In addition, it is also known that when water exists in zinc oxide, barium carbonate, etc., the respective metal ions are eluted. [0004] In order to solve su...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09C3/06A61K8/19A61K8/27A61K8/29C09C1/00C09C3/08
CPCG02B5/208C01P2004/64C09C1/407A61K8/29C09C1/3669C01P2004/62A61K8/27C09C1/24C09C1/3692A61K2800/651A61K8/04C09C3/08A61K2800/63A61K8/0245C09C3/12C09C1/043A61K2800/623A61Q17/04C09C3/006C01P2004/04C09C1/3661B05D5/00C09C1/3684C09C3/063C01P2004/51C01P2002/85A61K8/19B82Y30/00A61K8/0266A61K2800/412C09C1/02C09C1/024C09C1/3054C09C1/3063C09C1/3081C09C1/309
Inventor 芦田拓郎合田菜菜惠
Owner SAKAI CHEM IND CO LTD
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