Siloxane Binder Composition for Crack-Resistant Insulation Coatings
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Solution Overview
Problem
Current thermal and acoustic insulation materials, particularly hydrophobic aerogel-based compositions, face limitations in temperature stability, viscosity issues, and require separate storage and application of components, which restrict their use in high-temperature applications and lead to cracking in dried films.
Innovation Solution
A binder composition combining siloxane polymers, silicone resins, and hydrophilic porous silica or aerogel powders, which are stable up to 900°C, allowing for a one-component application and preventing viscosity drift and cracking, while providing enhanced thermal and acoustic insulation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If hydrophobic aerogel is treated with silicone film forming binder material, then thermal stability is improved, but composition viscosity increases and cracks form in dried film
Solution Approach 1:
A silane coupling agent is introduced as an intermediary substance between the hydrophobic aerogel particles and the silicone binder. The silane coupling agent modifies the aerogel surface to be more compatible with the binder, reducing viscosity increase and preventing crack formation while maintaining thermal stability.
Solution Approach 2:
The chemical parameters of the aerogel surface are changed through silane treatment, transforming the surface properties to achieve better compatibility with the binder system. This parameter change allows the composition to maintain low viscosity and crack-free films while achieving high thermal stability.
2Reliability
If hydrophobic aerogel is treated with silicone-based binder emulsion, then binding is improved, but separate storage and application of components is required
Solution Approach 1:
The silane coupling agent is incorporated into the binder emulsion formulation, merging multiple functional components into a single unified product. This eliminates the need for separate storage and application of aerogel and binder components, simplifying the application process while maintaining reliable adhesion.
3Ease of operation
If traditional thermal insulation materials are used, then ease of application is maintained, but temperature stability is limited to 120°C
Solution Approach 1:
The invention creates a composite material system combining hydrophobic aerogel particles with a specially formulated silicone-based binder containing silane coupling agents. This composite structure achieves both high temperature stability (up to 900°C) and ease of application, overcoming the limitations of traditional insulation materials.
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 offers long-term stability, prevents cracking in high-thickness coatings, and enables use at higher temperatures than traditional hydrophobic aerogels, providing improved thermal and acoustic insulation without the need for separate component mixing before application.
Implementation Method 1
a binder comprising one or more siloxane polymers, silicone resins, silicone-based elastomers, and mixtures thereof
Implementation Method 2
amorphous, porous hydrophilic silica(s) having a thermal conductivity at 20° C. and atmospheric pressure of from 0.001 to 0.15 W/m·K
Implementation Method 3
prevents cracking in high-thickness coatings
Data Source
AI summary
The present invention relates to a composition comprising a binder comprising one or more siloxane polymers, silicone resins, silicone based elastomers, and mixtures thereof, wherein said binder optionally comprises one or more cross-linker components comprising a silane and/or a siloxane containing silicon-bonded hydrolysable groups; and a hydrophilic powder and/or gel selected from one or more amorphous, porous hydrophilic silica (s) having a thermal conductivity at 20° C. and atmospheric pressure of 0.001 to 0.15 W/m·K and a surface area (SBET) of between 200 and 1500 m2/g, one or more hydrophilic aerogel (s) and mixtures thereof, wherein the binder is a solution, an emulsion, or a dispersion in water. The invention also relates to the use of the composition as or in thermally or acoustically insulating materials and to coated substrates, products and articles made by using the composition.