Film-Forming Silica Sol Stability via Silane Coupling
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Solution Overview
Problem
Silica sol-based film-forming systems face instability and cracking issues due to the thermodynamic instability and environmental changes, requiring a compatible film-forming auxiliary to maintain dispersion and film continuity.
Innovation Solution
A film-forming silica sol composition comprising 66-91% silica sol, 0.1-1.8% modifying agent, and 7.2-33.9% film-forming auxiliary, with specific preferred components like silane coupling agents and acrylic resin, is prepared through a controlled mixing process to enhance stability and film properties.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If film-forming auxiliary is directly added into silica sol, then film-forming performance is improved, but stability of the system deteriorates due to flocculation and agglomeration
Solution Approach 1:
The patent introduces a silane coupling agent as an intermediary substance between the film-forming auxiliary and silica sol. This coupling agent modifies the surface of silica particles to improve compatibility with the film-forming auxiliary, enabling stable dispersion without flocculation while maintaining good film-forming performance.
Solution Approach 2:
The patent optimizes the particle size of silica sol to 6-15 nm and controls the solid content at 6-40 wt%, with preferred values of 10 nm and 30 wt% respectively. These parameter changes enhance the dispersion stability and film-forming capability of the silica sol system.
2Device complexity
If silica sol is used as independent film-forming substance, then simplicity is maintained, but cracks occur after film forming affecting continuity
Solution Approach 1:
The patent creates a composite film-forming system combining silica sol with film-forming auxiliary (acrylic resin, polyurethane, styrene-acrylic resin, or epoxy resin) and silane coupling agent. This composite formulation maintains relative simplicity while eliminating cracks and ensuring film continuity through synergistic effects of the components.
3Stability of the object's composition
If environment conditions change, then silica sol dispersion is maintained through stabilizers, but flocculation and agglomeration occur due to thermodynamic instability
Solution Approach 1:
The silane coupling agent serves as a mediator that chemically modifies the silica surface to provide steric and electrostatic stabilization. This intermediary layer prevents flocculation and agglomeration under varying environmental conditions while maintaining colloidal stability.
Solution Approach 2:
The patent controls the particle size at 6-15 nm and solid content at 6-40 wt%, which optimizes the surface area to volume ratio and interparticle interactions. These parameter changes enhance the stability of the colloidal system against environmental variations.
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 resulting film-forming coating exhibits higher hardness, stronger adhesive force, and tunable transparency, with optimized processing conditions ensuring a stable and continuous film layer.
Implementation Method 1
the modifying agent is selected from one of a silane coupling agent and a surface active agent
Implementation Method 2
film-forming auxiliary: 7.2-33.9%
Data Source
AI summary
The present disclosure relates to the field of preparing an inorganic nanometer material and application thereof, and specifically relates to a film-forming silica sol, a method of preparing the silica sol, and usage thereof. The present disclosure provides a film-forming silica sol comprising, by weight percentage, constituents of: silica sol: 66-91%; modifying agent: 0.1-1.8%; film-forming auxiliary: 7.2-33.9%. The present disclosure further provides a method of preparing a film-forming silica sol and an application thereof. With the film-forming silica sol, a method of preparing the silica sol, and usage thereof according to the present disclosure, the prepared film-forming silica sol has a good appearance transparency and stability, and when applied to paint as a film-forming coating, it has a good glossiness, a high hardness, and a strong adhesive force; therefore, it has a high practical value in the paint field.