Polystyrene Microspheres with Refractive Layers for UV Protection
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Solution Overview
Problem
Current sun protection products, particularly physical sunscreens, face challenges in enhancing UV protection efficacy without causing skin damage or inhalation risks from nanoparticles, and increasing chemical sunscreen amounts can be detrimental.
Innovation Solution
A sun protection material composed of polystyrene microspheres with refractive layers such as titanium dioxide, zinc oxide, or silicon oxide, which scatter light in the 250 nm to 400 nm wavelength range, enhancing UV protection by adjusting particle size and refractive index to improve dispersion and safety.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the usage amount of physical sunscreen is increased to enhance UV protection capability, then UV protection capability is improved, but the difficulty of dispersion of powder in emulsion increases and potential inhalation risk occurs
Solution Approach 1:
The physical sunscreen is divided into microscopic particles with specific size ranges (0.5-5 μm for titanium dioxide and zinc oxide). This segmentation allows the particles to disperse more easily in the emulsion while maintaining effective UV protection capability, reducing both inhalation risk and dispersion difficulty.
Solution Approach 2:
The patent specifies precise particle size parameters for the physical sunscreen ingredients (titanium dioxide and zinc oxide) ranging from 0.5 to 5 μm. By controlling this critical parameter, the formulation achieves optimal balance between UV protection efficacy, dispersion performance, and safety by minimizing inhalation risk.
2Reliability
If the usage amount of chemical sunscreen is increased to enhance UV protection capability, then UV protection capability is improved, but skin damage occurs
Solution Approach 1:
The patent combines physical sunscreen ingredients (titanium dioxide and zinc oxide) with chemical sunscreen agents (UV absorbents) in a synergistic formulation. This merging allows the product to achieve high UV protection capability through multiple mechanisms while using lower amounts of chemical sunscreen, thereby reducing skin damage risks.
Solution Approach 2:
The sunscreen composition uses a composite approach by integrating inorganic physical sunscreen particles with organic UV absorbent molecules. This composite material strategy enables enhanced UV protection through both scattering/reflecting (physical) and absorbing (chemical) mechanisms, reducing reliance on high concentrations of potentially harmful chemical sunscreen.
3Shape
If nanonization of physical sunscreen is performed to prevent excessively white makeup, then cosmetic appearance is improved, but UV protection capability cannot be significantly enhanced and dispersion difficulty increases
Solution Approach 1:
The patent optimizes the particle size parameter of physical sunscreen to a specific range (0.5-5 μm for titanium dioxide and zinc oxide). This parameter optimization achieves the right balance: particles are small enough to reduce the excessive white cast while remaining large enough to maintain effective UV scattering and protection capability, avoiding the limitations of nanosized particles.
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 sun protection composition achieves a high SPF value of at least 50 with improved UV blocking capability against UVA and UVB rays, reducing the need for excessive sunscreen application and minimizing skin damage risks.
Implementation Method 1
The sun protection material can scatter a light in a wavelength range between 250 nm and 400 nm
Implementation Method 2
the refractive layers having the refractive index more than the refractive index of the polystyrene microspheres at least partially cover the surfaces of the polystyrene microspheres, so as to enhance the ability of refracting light
Implementation Method 3
In chemical sun protection, UV is absorbed by using a chemical substance to convert the chemical substance into molecular vibrational energy or heat energy to eliminate UV damage
Data Source
AI summary
Provided is a sun protection material including a plurality of polystyrene microspheres and a plurality of refractive layers. The polystyrene microspheres have a particle size of 150 nm to 300 nm. Surfaces of the polystyrene microspheres are at least partially covered by the refractive layers. The sun protection material can scatter a light in a wavelength range between 250 nm and 400 nm. A sun protection composition containing the sun protection material also may scatter a light of a wavelength range between 250 nm and 400 nm, such that the UV protection of the sun protection composition is enhanced.