Rutile Titanium Oxide Organosol Stability
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Solution Overview
Problem
Titanium oxide organosols with rutile-type titanium oxide in water-insoluble solvents face challenges in achieving high transparency, high refractive index, and viscosity stability, due to low dispersibility of titanium oxide particles in such solvents.
Innovation Solution
Surface treatment of rutile-type titanium oxide with hydrous oxides of Zr, Ce, or Sn, combined with a silane coupling agent and a basic additive, results in a stable dispersion with high Ti content and controlled metal species ratio, achieving a high refractive index and low viscosity in a water-insoluble solvent.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If rutile-type titanium oxide is used in water-insoluble solvent to achieve high refractive index, then refractive index is improved, but dispersibility of titanium oxide particles deteriorates
Solution Approach 1:
The patent introduces a silane coupling agent as an intermediary substance that chemically bonds to both the titanium oxide particle surface and the water-insoluble solvent molecules. This mediator enables stable dispersion of rutile-type titanium oxide particles in the non-aqueous solvent, resolving the incompatibility between high refractive index material and water-insoluble solvent system.
Solution Approach 2:
The patent modifies the surface properties of titanium oxide particles by controlling the surface treatment conditions and metal species composition. By adjusting parameters such as metal species type (Zr, Ce, Sn, Fe), surface treatment concentration, and pH conditions, the patent optimizes both dispersibility and refractive index properties of the particle-solvent system.
2Illumination intensity
If high concentration of titanium oxide particles is used to increase refractive index, then refractive index is improved, but viscosity stability deteriorates
Solution Approach 1:
The silane coupling agent acts as a steric barrier and chemical bridge that prevents particle aggregation at high concentrations. This intermediary substance maintains stable dispersion even when titanium oxide particle concentration is increased to achieve high refractive index, thereby preserving viscosity stability.
Solution Approach 2:
The patent creates a composite particle structure by combining rutile-type titanium oxide with metal hydrous oxides (Zr, Ce, Sn, Fe) on the particle surface. This composite structure optimizes both optical properties (refractive index) and rheological properties (viscosity stability) simultaneously, allowing high particle concentration without sacrificing stability.
3Stability of the object's composition
If surface treatment with metal hydrous oxide is applied to improve dispersibility, then dispersibility is improved, but manufacturing complexity increases
Solution Approach 1:
The patent performs surface treatment with metal hydrous oxides as a preliminary step before incorporating the particles into the water-insoluble solvent system. By pre-modifying the particle surface properties, the patent simplifies subsequent processing and ensures stable dispersion without requiring complex multi-step procedures during final formulation.
Solution Approach 2:
The patent establishes specific parameter ranges for metal species composition (20-50 mass% metal oxide content) and surface treatment conditions that optimize dispersibility while maintaining manufacturing simplicity. These parameter specifications provide clear guidelines for production while avoiding overly complex process requirements.
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 solution provides a stable, high-transparency, high-refractive-index titanium oxide organosol with excellent viscosity stability, enabling the formation of coatings with enhanced hardness and reduced film thickness, suitable for optical elements.
Implementation Method 1
treating the surface of rutile-type titanium oxide with a hydrous oxide of at least one metal species
Implementation Method 2
deflocculating rutile-type titanium oxide particles that have been subjected to the surface treatment in the presence of a silane coupling agent and a basic additive
Implementation Method 3
an organosol that has a high transparency and a high refractive index
Data Source
AI summary
There has been demand for a titanium oxide organosol that has a high transparency and a high refractive index and that also exhibits an excellent viscosity stability over time. The rutile-type titanium oxide organosol according to the present invention comprises a silane coupling agent, a basic additive acting as a deflocculant, a water-insoluble solvent, and rutile-type titanium oxide particles that have been surface-treated with a hydrous oxide of at least one metal species selected from Zr, Ce, Sn, and Fe, the rutile-type titanium oxide organosol being characterized in that the Ti ratio contained in the colloidal particles in the rutile-type titanium oxide organosol is at least 60 mass% when calculated as the oxide, and the ratio of metal species at the colloidal particle surface derived from x-ray photoelectron spectroscopy is 20-50 mass%.