Barium Sulphate Phlegmatizer for Organic Peroxide Stability
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Solution Overview
Problem
Organic peroxides used in coating compositions are unstable and prone to segregation due to hygroscopy and acid sensitivity, making them unsuitable for applications involving water or acidic environments, limiting the choice of ingredients and stability.
Innovation Solution
A powder mixture comprising 20-90 wt % powdered organic peroxides and 10-80 wt % powdered filler materials, with at least 60 wt % being barium sulphate, which is non-hygroscopic and acid-insensitive, ensuring stability and preventing segregation, even when differing in size and density.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If calcium carbonate is used as a solid phlegmatizer for organic peroxides, then the peroxide can be diluted and stored safely, but the mixture becomes hygroscopic and acid-sensitive, leading to segregation and coating deterioration
Solution Approach 1:
The invention changes the chemical composition parameter of the phlegmatizer from calcium carbonate to barium sulphate. This parameter change eliminates hygroscopy and acid sensitivity while maintaining the dilution function, thereby preventing segregation and maintaining mixture homogeneity during storage and application.
Solution Approach 2:
The invention uses barium sulphate as a stable, non-hygroscopic, non-acid-sensitive solid phlegmatizer that maintains long-term stability in the powder mixture, replacing materials like calcium carbonate that degrade or cause segregation over time under humid or acidic conditions.
2Reliability
If calcium carbonate is used as a solid phlegmatizer, then dilution is achieved, but the mixture reacts with acids, leading to CO2 evolution and coating deterioration
Solution Approach 1:
The invention changes the chemical composition parameter of the phlegmatizer from calcium carbonate to barium sulphate. This parameter change eliminates acid sensitivity and CO2 evolution, allowing the peroxide mixture to remain stable even when exposed to acidic environments or ingredients.
Solution Approach 2:
Barium sulphate acts as an intermediary substance that provides physical dilution and safety benefits without chemically interacting with acids or moisture, thereby protecting the organic peroxide from harmful reactions while maintaining mixture stability.
3Reliability
If barium sulphate with much smaller primary particles and higher density is used as phlegmatizer, then transparency and stability to water/acids are achieved, but segregation is expected due to size and density differences
Solution Approach 1:
The invention uses barium sulphate with controlled primary particle size (0.1-10 micrometers) that is much smaller than organic peroxide particles. This segmentation of particle sizes, combined with the specific density difference, creates a stable powder mixture that resists segregation despite the significant differences in size and density between components.
Solution Approach 2:
The invention changes the particle size parameter of the barium sulphate to 0.1-10 micrometers and utilizes its high density (4.5 g/ml) to create a stable powder mixture. This parameter change results in a mixture that maintains homogeneity and does not segregate, contrary to conventional expectations.
Data Source
AI summary
Powder mixture comprising: -20-90 wt % of one or more powdered organic peroxides and -10-80 wt % of one or more powdered filler materials, at least 60 wt % thereof being barium sulphate.