Silicone Microparticle Surface Coating for Agglomeration Control
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Solution Overview
Problem
Conventional silicone microparticles with low rubber hardness and small particle diameter exhibit high agglomeration tendency and poor dispersibility, limiting their effectiveness as stress relaxation agents in resins and cosmetic applications.
Innovation Solution
A silicone microparticle comprising 100 parts by mass of a silicone elastomer spherical microparticle with a volume-average particle diameter of 0.1 to 100 μm, covered with 0.5 to 25 parts by mass of polyorganosilsesquioxane having a granule size of 60 nm or less, produced using a hydrolysis-condensation method in the presence of a cationic surfactant and/or cationic water-soluble polymer.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If rubber hardness of the silicone elastomer spherical microparticle is lowered or particle diameter is made smaller to enhance stress relaxation effect and soft feeling, then stress relaxation effect and soft feeling are improved, but agglomeration tendency increases and dispersibility decreases
Solution Approach 1:
The invention changes the surface properties of the silicone elastomer spherical microparticle by covering it with polyorganosilsesquioxane, transforming it from a hydrophobic surface to a hydrophilic surface. This parameter change in surface chemistry enables the microparticle to maintain low agglomeration tendency even when rubber hardness is low and particle diameter is small, thus resolving the contradiction between stress relaxation effect and agglomeration tendency.
Solution Approach 2:
The invention creates a composite structure by coating the silicone elastomer spherical microparticle with polyorganosilsesquioxane. This composite material combines the stress relaxation properties of the silicone elastomer with the dispersibility and low agglomeration properties of the polyorganosilsesquioxane coating, allowing the microparticle to maintain excellent dispersibility even at low rubber hardness and small particle diameters.
2Ease of operation
If rubber hardness of the silicone elastomer spherical microparticle is lowered or particle diameter is made smaller to enhance soft feeling in cosmetics, then soft feeling is improved, but agglomeration tendency increases and dispersibility decreases
Solution Approach 1:
The invention changes the surface properties of the silicone elastomer spherical microparticle by covering it with polyorganosilsesquioxane, transforming it from a hydrophobic surface to a hydrophilic surface. This parameter change in surface chemistry enables the microparticle to maintain low agglomeration tendency and excellent dispersibility even when rubber hardness is low and particle diameter is small, thus resolving the contradiction between soft feeling and dispersibility.
Solution Approach 2:
The invention creates a composite structure by coating the silicone elastomer spherical microparticle with polyorganosilsesquioxane. This composite material combines the soft feeling properties of the silicone elastomer with the dispersibility and low agglomeration properties of the polyorganosilsesquioxane coating, allowing the microparticle to maintain excellent dispersibility even at low rubber hardness and small particle diameters.
3Reliability
If silicone elastomer microparticle is used to enhance stress relaxation effect in resin, then stress relaxation effect is improved, but agglomeration tendency increases and dispersibility into resin decreases
Solution Approach 1:
The invention changes the surface properties of the silicone elastomer spherical microparticle by covering it with polyorganosilsesquioxane, transforming it from a hydrophobic surface to a hydrophilic surface. This parameter change in surface chemistry enables the microparticle to maintain low agglomeration tendency and excellent dispersibility into resin, thus resolving the contradiction between stress relaxation effect and dispersibility into resin.
Solution Approach 2:
The invention creates a composite structure by coating the silicone elastomer spherical microparticle with polyorganosilsesquioxane. This composite material combines the stress relaxation properties of the silicone elastomer with the dispersibility and low agglomeration properties of the polyorganosilsesquioxane coating, allowing the microparticle to maintain excellent dispersibility into resin even when providing stress relaxation effect.
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 silicone microparticles demonstrate low agglomeration tendency and excellent dispersibility, enhancing stress relaxation effects in resins and providing a soft, non-sticky feel in cosmetics, while maintaining high classification performance in dry processes.
Implementation Method 1
a hydrolysis-condensation of an organotrialkoxy silane is carried out in the presence of water, a silicone elastomer spherical microparticle having volume-average particle diameter of 0.1 to 100 μm, an basic substance, and a cationic surfactant and/or a cationic water-soluble polymer, whereby covering surface of the silicone elastomer spherical microparticle with a polyorganosilsesquioxane
Data Source
AI summary
The present invention provides a silicone microparticle, wherein the silicone microparticle comprises 100 parts by mass of a silicone elastomer spherical microparticle having volume-average particle diameter of 0.1 to 100 μm and 0.5 to 25 parts by mass of a polyorganosilsesquioxane to cover surface of the silicone elastomer spherical microparticle, wherein the polyorganosilsesquioxane has a shape of granule with the size thereof being 60 nm or less. There can be provided a silicone microparticle having low agglomerating tendency and excellent dispersibility even if rubber hardness of a silicone elastomer microparticle is low and a particle diameter thereof is small.