Polysilazane Coating Eliminates Hydrogen Release
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Solution Overview
Problem
Existing polysilazane compositions release hazardous substances like hydrogen when reacting with air-borne moisture and require reactive solvents, posing safety risks and affecting substrate appearance.
Innovation Solution
A polysilazane composition comprising an organopolysilazane compound without Si—H structures and an organoxysilane compound with at least two silicon atoms, which forms a durable multilayer construction without releasing hazardous substances and using inert solvents.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If inorganic polysilazane is used to form a coating, then water repellent effect is achieved, but hazardous hydrogen gas is released when reacting with air-borne moisture
Solution Approach 1:
The patent changes the chemical composition parameters by using organopolysilazane instead of inorganic polysilazane, and specifically uses compounds without Si-H bonds. This parameter change eliminates the harmful hydrogen gas release while preserving the water repellent function through the Si-O-Si bond formation mechanism.
Solution Approach 2:
The patent employs a composite material system combining organopolysilazane with specific organoxysilane compounds (containing at least two silicon atoms). This composite approach maintains the protective and water repellent properties while eliminating the hazardous gas release associated with inorganic polysilazane.
2Ease of operation
If alkoxysilane is used as solvent in large amount, then composition can be applied, but composition gels and detracts from substrate appearance
Solution Approach 1:
The patent changes the solvent system parameters by replacing large amounts of alkoxysilane with inert solvents. This parameter change prevents gelation while maintaining the composition's ability to be applied to substrates, thereby preserving substrate appearance.
Solution Approach 2:
The patent introduces inert solvents as intermediary substances to replace the problematic alkoxysilane solvent. These inert solvents mediate the coating process by providing necessary solvent properties without the harmful side effect of gelation, thus maintaining both applicability and appearance.
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 composition is safe, prevents substrate erosion, and enhances the durability of the topcoat layer, maintaining water repellency and appearance.
Implementation Method 1
The inorganic polysilazane compound forms a coating through the mechanism that Si—H bonds on the inorganic polysilazane are converted to Si—OH bonds and eventually to Si—O—Si bonds under the impetus of air-borne moisture or oxygen or by heat treatment
Implementation Method 2
The inorganic polysilazane compound forms a coating through the mechanism that Si—H bonds on the inorganic polysilazane are converted to Si—OH bonds and eventually to Si—O—Si bonds under the impetus of air-borne moisture or oxygen or by heat treatment
Implementation Method 3
The Si—OH bonds converted from Si—H bonds on the inorganic polysilazane are reactive. When a silicon-based compound is applied so as to act at this site, the Si—OH bonds derived from the inorganic polysilazane form Si—O—Si bonds with the silicon-based compound, by which the silicon-based compound is linked to the coating
Data Source
AI summary
A polysilazane composition comprising an organopolysilazane compound free of Si—H structure and an organoxysilane compound having at least two silicon atoms in the molecule does not release hazardous substances such as hydrogen or require reactive solvents.