Polysiloxane-Coated Metal Oxide Particles for Stronger Hydrophobicity
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Solution Overview
Problem
Metal oxide particles coated with dimethylpolysiloxane exhibit insufficient hydrophobicity, making it difficult to mix them with oil-based materials and resins, limiting their application in cosmetics.
Innovation Solution
Polysiloxane-coated metal oxide particles with a hydroxyl group detection rate of 10% or less, produced by mixing metal oxide particles with dimethylpolysiloxane having a kinematic viscosity of 500 mm2/s to 4,000 mm2/s without a solvent and subjecting them to a heat treatment between 100°C and 380°C.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If metal oxide particles are coated with dimethylpolysiloxane, then the surface state is modified, but the hydrophobicity is insufficient
Solution Approach 1:
The patent changes the kinematic viscosity parameter of the dimethylpolysiloxane coating material to achieve better hydrophobicity. By selecting polysiloxane with specific viscosity characteristics, the coating effectiveness is improved while maintaining ease of application.
2Adaptability or versatility
If metal oxide particles are coated with dimethylpolysiloxane, then surface treatment is performed, but mixing with oil-based materials becomes difficult
Solution Approach 1:
The patent adjusts the kinematic viscosity of the dimethylpolysiloxane coating material to enhance compatibility with oil-based cosmetic materials. This parameter change enables smoother integration and mixing while maintaining the desired hydrophobic properties.
3Reliability
If conventional surface treatment is used, then metal oxide particles are processed, but hydrophobicity does not reach required level
Solution Approach 1:
The patent modifies the kinematic viscosity parameter of the coating material to achieve superior hydrophobicity. This parameter adjustment ensures that the surface coating reaches the required quality level for effective hydrophobic performance.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The resulting particles exhibit excellent hydrophobicity, allowing for better mixing with oil-based materials and resins, enhancing their suitability for use in cosmetics.
Implementation Method 1
a hydroxyl group detection rate is 10% or less, the hydroxyl group detection rate being calculated based on an adsorption amount of a red coloring agent adsorbed on a hydroxyl group present on the surfaces of the metal oxide particles before being coated with the dimethylpolysiloxane and an adsorption amount of a red coloring agent adsorbed on the hydroxyl group present on the surfaces of the metal oxide particles after being coated with the dimethylpolysiloxane
Implementation Method 2
a step of subjecting the metal oxide particles coated with the dimethylpolysiloxane to a heat treatment at 100° C. or higher and 380° C. or lower
Data Source
AI summary
The present invention also addresses the problem of providing a dispersion liquid, a composition and a cosmetic each containing the dimethylpolysiloxane-coated metal oxide particles. The present invention also addresses the problem of providing a method for producing the dimethylpolysiloxane-coated metal oxide particles. The present invention relates to: polysiloxane-coated metal oxide particles, in which the surfaces of metal oxide particles are coated with dimethylpolysiloxane, and which have a hydroxyl group detection ratio of 10% or less; and a method for producing polysiloxane-coated metal oxide particles, the method comprising a surface treatment step for mixing metal oxide particles with dimethylpolysiloxane having a kinematic viscosity of 500 mm2/s to 4000 mm2/s inclusive at 25° C., without using a solvent, to coat the surfaces of the metal oxide particles with the dimethylpolysiloxane and a step for subjecting the dimethylpolysiloxane-coated metal oxide particles to a heat treatment at 250° C. to 380° C. inclusive.