Aerogel Coating Film Strength via Composite Binder System
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Solution Overview
Problem
Existing coating liquids for aerogel particles lack a formulation that effectively combines high coating film strength, adhesiveness, and thermal insulation, while also ensuring easy film formation and improved aerogel particle dispersibility.
Innovation Solution
A novel coating liquid comprising aerogel particles, a water-based solvent, organic or inorganic fibers, a cellulose-based resin as a first binder, and a thermoplastic acrylic or thermosetting epoxy resin as a second binder, which has lower solubility in the liquid medium, thereby enhancing film strength and adhesiveness.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If a conventional coating liquid formulation is used, then the coating liquid can be applied, but the coating film strength and adhesiveness are insufficient
Solution Approach 1:
The patent employs a composite binder system combining cellulose-based resin (first binder) with thermoplastic acrylic resin or thermosetting epoxy resin (second binder). This composite approach leverages the advantages of each resin type to achieve superior coating film strength and adhesiveness that cannot be obtained with a single resin system, directly resolving the technical contradiction between strength and formulation complexity.
Solution Approach 2:
The patent utilizes the difference in solubility parameters between the first binder resin (cellulose-based, water-soluble) and the second binder resin (lower solubility in liquid medium). This parameter change approach allows the more soluble first binder to dissolve completely while the second binder forms a robust network structure, enhancing coating film strength without excessive formulation complexity.
2Temperature
If aerogel particles are added to improve thermal insulation, then thermal insulation performance increases, but aerogel particle dispersibility deteriorates
Solution Approach 1:
The cellulose-based resin acts as an intermediary substance that facilitates the dispersion of aerogel particles in the liquid medium. Its high solubility and compatibility with water-based solvents create a stable medium that prevents aerogel particle aggregation, thereby maintaining both thermal insulation performance and particle dispersibility simultaneously.
Solution Approach 2:
The patent changes the chemical environment parameters by using a water-based liquid medium with specific solvent properties that are compatible with aerogel particle surfaces. This parameter adjustment enhances the interfacial compatibility between the liquid medium and aerogel particles, improving dispersibility while preserving the thermal insulation benefits of aerogel incorporation.
3Strength
If the second binder resin with lower solubility is used, then coating film strength improves, but film formation ease deteriorates
Solution Approach 1:
The binder system is segmented into two functional components: the first binder resin (cellulose-based) that provides initial film formation and solubility, and the second binder resin (lower solubility) that provides enhanced strength. This segmentation allows each component to perform its specific function optimally without compromising the other, resolving the contradiction between film formation ease and coating film strength.
Solution Approach 2:
The first binder resin performs the preliminary action of dissolving in the liquid medium and forming an initial coating matrix, making the coating liquid easy to apply and form into a uniform film. Subsequently, the second binder resin reinforces this matrix to provide enhanced strength, ensuring that both ease of film formation and final strength requirements are met.
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 proposed coating liquid achieves a coating film with superior strength, adhesiveness, and thermal insulation, while also facilitating homogeneous film formation and improved aerogel particle dispersibility.
Implementation Method 1
By the addition of a water-based solvent containing water the dispersibility of the aerogel particle is improved, and hence a homogeneous coating film is easily obtained.
Implementation Method 2
By the addition of a cellulose-based resin as first binder a coating film excellent in the coating film strength and the adhesiveness is obtained, and in addition, an effect that viscosity of the coating liquid is so increased that a film is easily formed is attained.
Implementation Method 3
When the second binder resin is a thermosetting epoxy resin and further comprises an epoxy resin curing agent, a coating film further excellent in the coating film strength is easily obtained.
Data Source
Figure 1
AI summary
The present invention relates to a coating liquid comprising an aerogel particle and a liquid medium.