Zinc Oxide Powder Sebum Solidification
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Solution Overview
Problem
Zinc oxide powders used in cosmetics take too long to solidify sebum, which hinders effective suppression of make-up fading.
Innovation Solution
A zinc oxide powder with a water-soluble substance content of 0.30% by mass or less and a mass ratio of alkali metal to alkaline earth metal between 1:2 to 10:1, combined with surface treatment using inorganic or organic components, to accelerate sebum solidification.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional zinc oxide powder is used in cosmetics, then it provides ultraviolet-shielding function and gas transmission-suppressing function, but it takes too long to solidify sebum, making it difficult to suppress make-up fading
Solution Approach 1:
The patent changes the chemical composition parameters of zinc oxide powder by controlling the content of water-soluble substances (0.01-0.30% by mass) and the mass ratio of alkali metal to alkaline earth metal (1:2 to 10:1). This parameter optimization enables the powder to solidify sebum rapidly within 30 minutes, resolving the contradiction between effectiveness and time consumption
Solution Approach 2:
The patent creates a composite zinc oxide powder containing multiple elements (Zn, Al, Si, Ca, Mg, Na, K) with specific compositional ratios. This composite structure combines the ultraviolet-shielding properties of zinc oxide with the sebum-solidifying properties of alkali and alkaline earth metals, achieving both rapid sebum solidification and cosmetic functionality
2Loss of time
If zinc oxide powder with high water-soluble substance content is used, then sebum solidification may be accelerated, but transparency and dispersibility are compromised
Solution Approach 1:
The patent precisely controls the water-soluble substance content within 0.01-0.30% by mass and the alkali metal to alkaline earth metal ratio within 1:2 to 10:1. This narrow parameter range optimization ensures rapid sebum solidification while maintaining the transparency and dispersibility required for cosmetic applications
Solution Approach 2:
The patent applies surface treatment to the zinc oxide powder using inorganic components (silica, alumina) or organic components (silicone compounds, fatty acids, polyolefins). This surface modification creates local quality changes that improve dispersibility and maintain transparency without affecting the core sebum-solidifying functionality
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 solution significantly shortens the sebum solidification time and enhances the cosmetic's ability to prevent make-up fading while maintaining transparency and dispersibility.
Implementation Method 1
A zinc oxide powder has an ultraviolet-shielding function
Implementation Method 2
the zinc oxide powder is capable of suppressing the spreading of sebum by solidifying the sebum
Data Source
AI summary
In a zinc oxide powder of the present invention, a content of a water-soluble substance is 0.30% by mass or less, and a mass ratio between an alkali metal and an alkaline earth metal which are included in the water-soluble substance is in a range of 1:2 to 10:1.