Cesium Tungsten Bronze Coating for Heat Insulation
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Solution Overview
Problem
Current heat-insulation coating materials for glass, such as heat reflective coated glass and vacuum glass, face issues like light pollution, high cost, and unsatisfactory thermal insulation, while cesium tungsten bronze-based materials are limited by poor dispersibility and high volatile organic compounds (VOCs) in existing oil-based coatings.
Innovation Solution
A method to prepare a cesium tungsten bronze-based self-cleaning nano heat-insulation coating material using hydrothermal synthesis of cesium tungsten bronze nanoparticles and solvothermal synthesis of TiO2 nanoparticles, combined with ball milling and dispersing in water with a silane coupling agent to create a water-based coating with improved dispersibility and infrared absorption.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If heat reflective coated glass is used to achieve heat insulation, then thermal insulation performance is improved, but light pollution is caused due to high reflectivity of visible light
Solution Approach 1:
The coating selectively interacts with different wavelengths of light: it reflects infrared radiation (thermal energy) while transmitting visible light. This local quality differentiation allows the coating to provide heat insulation without causing light pollution, as the harmful infrared component is blocked while the beneficial visible light passes through
Solution Approach 2:
The coating exhibits wavelength-dependent optical properties, appearing transparent to visible light but reflective to infrared radiation. This selective optical response enables the coating to insulate against heat while maintaining visual transparency, avoiding the light pollution issue associated with conventional reflective coatings
2Loss of energy
If vacuum glass is used to achieve heat insulation by removing air in the gap, then thermal insulation is improved, but airtightness requirements increase and cost becomes expensive
Solution Approach 1:
The invention extracts and eliminates the air gap component from the insulation structure by applying a functional coating directly on the glass surface. This coating provides thermal insulation through infrared reflection without requiring a vacuum or air gap, thereby removing the airtightness requirements and reducing structural complexity
Solution Approach 2:
The coating represents a simpler, more cost-effective alternative to vacuum glass technology. By using a deposited coating layer instead of complex vacuum-sealed structures, the solution reduces manufacturing cost and structural complexity while achieving comparable or superior insulation performance
3Loss of energy
If cesium tungsten bronze is used as heat-insulation coating material, then infrared absorption and visible light transmittance are improved, but dispersibility is poor limiting its application
Solution Approach 1:
The cesium tungsten bronze material is segmented into nanoparticle form, which dramatically improves its dispersibility in coating formulations. The nanoscale segmentation allows the particles to distribute uniformly throughout the coating matrix while maintaining the desired infrared absorption and visible light transmittance properties
Solution Approach 2:
The invention changes the size parameter of cesium tungsten bronze from bulk material to nanoparticles. This parameter change fundamentally alters the material's dispersibility characteristics, enabling it to be effectively incorporated into coating formulations while preserving its optical and thermal properties
4Loss of energy
If oil-based heat-insulation coating materials are used, then heat insulation performance is achieved, but volatile organic compounds (VOCs) content is high causing health hazards
Solution Approach 1:
The invention replaces harmful oil-based binders with water-based alternatives, converting the harmful VOC emissions into benign water vapor. This substitution maintains the heat insulation functionality while eliminating the health hazards associated with high VOC content, effectively transforming a harmful formulation into a safe one
Data Source
AI summary
The present disclosure provides a cesium tungsten bronze-based self-cleaning nano heat-insulation coating material, and method of preparing the same. Cesium tungsten bronze nanoparticles are prepared by hydrothermal method using WCl6 and CsOH.5H2O as raw materials, PVP as a surfactant and acetic acid as an acid catalyst. TiO2 nanoparticles are prepared from TiCl4. Subsequently ball milling and dispersing of the cesium tungsten bronze nanoparticles, the TiO2 nanoparticles, and a silane coupling agent with water to obtain an aqueous slurry containing cesium tungsten bronze/TiO2 composite particles is performed. The concentration of the aqueous slurry containing cesium tungsten bronze/TiO2 composite particles is adjusted to obtain a self-cleaning nano heat-insulation coating material.