Composite Cured Silicone Powder Coating for Flowability
Solution Overview
Problem
Cured silicone powders exhibit poor flowability and hydrophilicity, leading to inadequate dispersion in water-based compositions, which affects the uniformity of matting effects in paints and tactile sensations in cosmetics.
Innovation Solution
A composite cured silicone powder is developed by coating a cured silicone powder with an inorganic fine powder and a hydrophilic monohydric or polyhydric alcohol, enhancing flowability and hydrophilicity through mechanical shearing during the mixing process.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If cured silicone powder is used as an additive in water-based compositions, then it provides stress-relaxing and lubricating functions, but it exhibits poor flowability and dispersibility due to strong aggregation
Solution Approach 1:
An inorganic fine powder (silica, alumina, or titania) is introduced as an intermediary substance that coats the surface of the cured silicone powder particles. This intermediate layer reduces the strong aggregation tendency of the silicone powder while maintaining its functional properties, thereby improving flowability and dispersibility in water-based compositions without sacrificing stress-relaxing and lubricating functions
2Ease of operation
If cured silicone powder is coated with inorganic fine powder to improve flowability, then dispersibility improves, but hydrophilicity deteriorates leading to poor affinity for water-based compositions
Solution Approach 1:
The surface of the inorganic fine powder coating is modified with a hydrophilic monohydric or polyhydric alcohol to create a localized hydrophilic region. This allows the particle core to maintain its flowability-enhancing inorganic coating while the surface layer provides the necessary hydrophilicity for good affinity with water-based compositions, achieving both improved flowability and maintained hydrophilicity
3Adaptability or versatility
If a surfactant is attached to inorganic fine powder to increase hydrophilicity, then affinity for water-based compositions improves, but compositional design becomes difficult due to large amounts of surfactant required
Solution Approach 1:
The patent uses small amounts of hydrophilic monohydric or polyhydric alcohols (2-20 mass parts per 100 mass parts of cured silicone powder) instead of large amounts of surfactants. These alcohol molecules provide sufficient hydrophilicity improvement with minimal addition, simplifying compositional design while achieving the desired affinity for water-based compositions
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 composite powder achieves excellent flowability, hydrophilicity, and dispersibility, making it suitable for use in water-based paints and cosmetics, ensuring uniformity and improved tactile sensations.
Implementation Method 1
an inorganic fine powder coated on the surface of the cured silicone powder
Implementation Method 2
a hydrophilic monohydric or polyhydric alcohol coated on the surface of component (A) and/or component (B)
Implementation Method 3
mixing the following components under conditions of mechanical shearing
Data Source
AI summary
A composite cured silicone powder comprising:(A) a cured silicone powder having an average particle size of 0.1 to 500μm, (B) an inorganic fine powder coated on the surface of said cured silicone powder and (C) a monohydric or polyhydric alcohol with a boiling point of at least 150 °C coating on the surface of component (A) and/or component (B). The composite cured silicone powder that has an excellent flowability, hydrophilicity, and dispersibility. And, this invention also relates to a production method of the composite, which is characterized by mixing components (A) to (C) under the condition of mechanical shearing.