Infrared-absorbing white paints for facade condensation control
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Solution Overview
Problem
The increasing insulation of buildings leads to more frequent and prolonged condensation on facade surfaces, promoting algae and fungi growth, while the use of biocides in coating materials is restricted by legal regulations and poses environmental concerns.
Innovation Solution
Development of pigmented coating materials containing inorganic white pigments and tungsten bronze as infrared radiation-absorbing materials, which absorb solar radiation without altering the hue or brilliance, thereby reducing surface temperature fluctuations and inhibiting algae and fungi growth.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If building insulation is improved, then energy efficiency is improved, but condensation on facade surfaces increases
Solution Approach 1:
The patent changes the thermal parameters of the facade surface by incorporating infrared-absorbing pigments that alter the surface's interaction with thermal radiation. This modifies the surface temperature profile to prevent condensation while maintaining the building's insulation properties.
Solution Approach 2:
The patent replaces the mechanical/physical approach of increasing insulation thickness with a chemical/optical approach using infrared-absorbing pigments in the coating. This substitutes thermal mass accumulation with radiative heat absorption at the surface level.
2Object-affected harmful factors
If biocides are added to coating materials, then algae and fungi growth is prevented, but environmental harm increases
Solution Approach 1:
The patent converts the harmful effect of condensation into a beneficial anti-algae mechanism. By allowing controlled condensation that creates a slightly acidic environment through carbonic acid formation, the coating naturally inhibits algae and fungi growth without requiring chemical biocides.
Solution Approach 2:
The coating system uses its own condensation moisture to create an anti-algae environment. The condensed water forms carbonic acid that naturally prevents biological growth, making the system self-regulating and eliminating the need for external biocidal agents.
3Temperature
If infrared-absorbing materials are added to white paints, then surface temperature control is improved, but paint composition complexity increases
Solution Approach 1:
The patent creates a composite coating material combining traditional white pigments (titanium dioxide) with infrared-absorbing pigments (tungsten bronze or iron oxide). This composite approach integrates multiple functions—whiteness, infrared absorption, and anti-algae properties—into a single unified material system.
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 pigmented coating materials effectively reduce the infestation of algae and fungi on facade surfaces by absorbing infrared radiation, maintaining a stable surface temperature and preventing condensation, while being environmentally friendly and compliant with legal regulations.
Implementation Method 1
the infrared radiation absorbing material is a tungsten bronze
Implementation Method 2
absorb solar radiation
Implementation Method 3
preventing condensation
Data Source
AI summary
Pigmented coating material comprising at least one inorganic white pigment and at least one infrared radiation-absorbing material in an amount of 0.01 to 5 wt%, based on the inorganic white pigment, said pigmented coating material being a masonry paint or a render.