Titania-Coated Inorganic Particles for Reflective Insulating Paint
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Solution Overview
Problem
Existing cool pigments for paint, such as aerogels and phase change materials, suffer from poor mechanical strength, high synthesis costs, and inefficient interface with binders, limiting their solar light reflectance and thermal insulation properties.
Innovation Solution
A method involving stirring a titania precursor with inorganic particles in an organic solvent for adsorption, followed by water addition to convert the precursor to titania, forming a coating on the particles, which can be used in paint formulations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If aerogel is used as cool pigment, then thermal insulation property is improved, but mechanical strength deteriorates
Solution Approach 1:
The patent combines aerogel particles with binder materials to form composite cool pigment particles. The aerogel provides thermal insulation properties while the binder material provides mechanical strength, creating a composite that overcomes the weakness of pure aerogel. This is achieved by mixing aerogel with binders in specific ratios and processing them together to form integrated composite particles.
2Temperature
If aerogel is used as cool pigment, then thermal insulation property is improved, but synthesis cost deteriorates
Solution Approach 1:
The patent modifies synthesis parameters including using ambient temperature processing, adjusting pH levels, and controlling drying conditions to reduce synthesis costs. The method employs simpler, less expensive reagents and processing conditions while maintaining the thermal insulation properties of the aerogel-based cool pigment.
3Temperature
If phase change material is used as cool pigment, then cooling effect is improved, but encapsulation complexity deteriorates
Solution Approach 1:
The patent integrates the phase change material directly into the pigment particle structure by combining it with binder materials during the formation process. This merging eliminates the need for separate encapsulation layers, as the binder itself serves as the structural matrix that contains and protects the phase change material, thereby reducing encapsulation complexity.
4Illumination intensity
If discrete titania particles and inorganic particles are physically mixed, then solar light reflectance is improved, but agglomeration occurs
Solution Approach 1:
The patent uses binder materials as intermediary substances that coat and bind discrete titania particles and inorganic particles together. This intermediary layer prevents direct contact and agglomeration between particles while maintaining their individual reflective properties, thus preserving solar light reflectance without causing agglomeration.
5Temperature
If hollow glass beads are used as cool pigment, then thermal insulation property is improved, but density difference causes formulation difficulty
Solution Approach 1:
The patent creates composite particles by combining hollow glass beads with denser binder materials. This composite structure balances the overall density, reducing the extreme density difference between hollow glass beads and other paint formulation components. The binder material acts as a density buffer, making the formulation easier to handle and process.
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 method produces titania-coated inorganic particles with high solar light reflectance and low thermal conductivity, enhancing paint formulations without agglomeration, and maintaining mechanical strength, while being economical and applicable at ambient conditions.
Implementation Method 1
stirring a mixture of a titania precursor and an inorganic particle in an organic solvent for a time period of more than 1 hour to cause adsorption of the titania precursor on the surface of the inorganic particle
Implementation Method 2
adding water to the mixture under stirring to convert the titania precursor to titania which then forms a coating on the inorganic particle
Data Source
AI summary
A method of forming a titania-coated inorganic particle comprising the steps of (a) stirring a mixture of a titania precursor such as a titanium alkoxide and an inorganic particle such as a hollow glass particles in an organic solvent such as an alcohol for more than 1 h to cause adsorption of the titania precursor on the surface of the inorganic particle; and (b) adding water dropwise to the mixture under stirring to convert the titania precursor to titania which then forms a coating on the inorganic particle. A method for forming a paint formulation, a titania-coated inorganic particle, a paint formulation comprising a titania-coated inorganic particle and use of a titania-coated inorganic particle in a paint formulation is also described.