Spherical silicone resin—chemically known as polymethylsilsesquioxane (PMSQ) or silicone resin microspheres—is a class of spherical silicone micro-powders featuring a highly cross-linked, three-dimensional network structure. Typically synthesized from methylsilane via hydrolysis and condensation, it appears as a white, free-flowing powder with particle sizes generally in the micron range (1–20 μm).
Key Structural Characteristics
Features an inorganic Si-O-Si backbone with organic methyl side groups, classifying it as an organic-inorganic hybrid material; particles are perfectly spherical with a narrow size distribution; fully cross-linked, rendering it insoluble and infusible (resistant to common organic solvents and high-temperature deformation).
Key Properties
High-temperature resistance: Minimal weight loss at 400°C; withstands short-term high-temperature exposure; converts to spherical silica upon calcination;
Lubricity and smoothness: Spherical particles provide a "ball-bearing" effect, offering a smooth tactile feel, wear resistance, and scratch resistance;
Hydrophobicity and low surface adhesion;
Optical properties: Suitable refractive index; transmits light while scattering it, making it a classic light-diffusing agent;
Low density: Lower density than inorganic silica powders; good dispersibility.
Common Applications
LED lighting: Light-diffusing agent for PC/PMMA lamp covers; balances light transmission and diffusion while eliminating glare;
Cosmetics: Used in foundations, loose powders, BB creams, and skincare creams to provide a smooth skin feel and soft-focus, concealing, and filling effects;
Coatings/Inks/Leather: Matting agent, tactile modifier, and wear/scratch resistance enhancer; improves the silky feel of coatings;
Plastic and rubber modification: Improves surface smoothness, wear resistance, and anti-blocking properties;
Others: Lubricating greases, anti-caking agents for powders, electronic packaging fillers, etc.
