Polysilazane Coating Fragmentation via In Situ Mixing
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Solution Overview
Problem
Polysilazane coatings face challenges due to the high reactivity of polysilazanes, leading to fragmentation when additives are introduced, which results in poor coating quality, material loss, and limited use of additives.
Innovation Solution
A method of 'in situ' mixing, where components of a polysilazane-based coating composition are stepwise introduced and mixed in a predetermined order and time-controlled manner directly before and/or during application to a substrate, allowing for the use of a wider range of additives and minimizing material loss.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If polysilazane additives are introduced to enhance coating performance, then coating quality is improved, but polysilazane fragmentation occurs leading to material loss and poor coating quality
Solution Approach 1:
The patent applies preliminary action by pre-mixing polysilazane with inert carriers (such as hydrocarbons or silicones) before application. This preliminary mixing prevents fragmentation by ensuring polysilazane is dispersed in a non-reactive medium prior to contact with the substrate, thereby maintaining material integrity while enabling the use of polysilazane additives for enhanced coating performance.
Solution Approach 2:
The patent uses inert carriers as intermediaries between polysilazane and the coating environment. These carriers (hydrocarbons or silicones) act as mediators that protect polysilazane from fragmentation by providing a non-reactive medium, allowing polysilazane to be introduced into the coating system without direct harmful interactions that would cause breakdown.
2Strength
If polysilazane is used for high reactivity and excellent coating properties, then coating hardness and weatherability are improved, but fragmentation occurs when additives are introduced
Solution Approach 1:
The patent applies preliminary action by pre-mixing polysilazane with inert carriers (such as hydrocarbons or silicones) before application. This preliminary mixing prevents fragmentation by ensuring polysilazane is dispersed in a non-reactive medium prior to contact with the substrate, thereby maintaining material integrity while enabling the use of polysilazane additives for enhanced coating performance.
Solution Approach 2:
The patent uses inert carriers as intermediaries between polysilazane and the coating environment. These carriers (hydrocarbons or silicones) act as mediators that protect polysilazane from fragmentation by providing a non-reactive medium, allowing polysilazane to be introduced into the coating system without direct harmful interactions that would cause breakdown.
3Reliability
If reactive additives are included to enhance coating performance, then coating properties are improved, but fragmentation and material loss increase
Solution Approach 1:
The patent applies preliminary action by pre-mixing polysilazane with inert carriers (such as hydrocarbons or silicones) before application. This preliminary mixing prevents fragmentation by ensuring polysilazane is dispersed in a non-reactive medium prior to contact with the substrate, thereby maintaining material integrity while enabling the use of polysilazane additives for enhanced coating performance.
Solution Approach 2:
The patent uses inert carriers as intermediaries between polysilazane and the coating environment. These carriers (hydrocarbons or silicones) act as mediators that protect polysilazane from fragmentation by providing a non-reactive medium, allowing polysilazane to be introduced into the coating system without direct harmful interactions that would cause breakdown.
4Stability of the object's composition
If polysilazane is handled with care excluding moisture and heat, then fragmentation is reduced, but processing complexity and time increase
Solution Approach 1:
The patent uses inert carriers as intermediaries between polysilazane and the coating environment. These carriers (hydrocarbons or silicones) act as mediators that protect polysilazane from fragmentation by providing a non-reactive medium, allowing polysilazane to be introduced into the coating system without direct harmful interactions that would cause breakdown.
Solution Approach 2:
The patent applies parameter changes by altering the physical state or form of polysilazane through mixing with carriers. This changes the handling parameters from requiring strict exclusion of moisture and heat to allowing more flexible processing conditions, thereby reducing handling complexity while maintaining stability.
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
This method results in polysilazane coatings with improved quality, reduced fragmentation, better control over porosity and surface roughness, and shorter post-coating processing and dry-to-touch times.
Implementation Method 1
Reaction of polysilazane Si—H functional units with additives bearing nucleophilic groups such as hydroxyl, carbonyl, carboxylic, amine or other reactive functional units can lead to breakdown of the polymer backbone
Implementation Method 2
volatile fragments are likely to evaporate before they react with non-volatile fragments or the polymer backbone
Data Source
AI summary
The present invention relates to the formation of silazane coatings. The invention provides a polysilazane coating method for limiting fragmentation of polysilazane and an assembly for performing said polysilazane coating method for limiting fragmentation of polysilazane.