Porous Opacifying Layers for Lightweight Light-Blocking Fabrics
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Solution Overview
Problem
Existing light-blocking materials, such as blackout curtains, face challenges with high specific gravity inorganic pigments that increase weight, require multiple coating operations, and expose light-absorbing layers, leading to visibility issues and manufacturing inefficiencies.
Innovation Solution
The development of an opacifying layer using porous particles with a continuous polymeric binder and a small amount of opacifying colorant, such as carbon black, dispersed in a matrix polymer, which provides high opacity and light-blocking capabilities while minimizing weight and coating operations, and preventing exposure of the light-absorbing layer.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If high specific gravity inorganic pigments are used to achieve light-blocking capability, then opacity is improved, but weight increases
Solution Approach 1:
The patent changes the physical and chemical parameters of the pigments by using porous structures with controlled pore sizes (1-100 nm) and specific surface areas (5-50 m²/g). This modifies the light interaction properties while reducing density, achieving high opacity with lower weight compared to traditional inorganic pigments like titanium dioxide.
Solution Approach 2:
The patent creates composite porous pigment particles comprising a porous support structure combined with light-absorbing materials (carbon black, metal oxides) or light-scattering materials (titania, zirconia). This composite structure leverages both the porous architecture for light scattering and the embedded materials for absorption, achieving superior opacity with reduced weight.
2Illumination intensity
If multiple coating operations are performed to achieve sufficient light blocking, then opacity is improved, but manufacturing complexity increases
Solution Approach 1:
The patent combines multiple functions into a single coating layer by incorporating both light-scattering porous structures and light-absorbing materials within the same pigment particles. This unified approach achieves the light-blocking effect that previously required multiple separate coating layers, simplifying the manufacturing process to a single coating operation.
3Illumination intensity
If light-absorbing layers are exposed to achieve light blocking, then opacity is improved, but visibility issues occur
Solution Approach 1:
The patent applies local quality by distributing different functional materials within the porous structure - light-absorbing materials are localized within the pores or on the surface, while the porous support structure provides the overall optical properties. This spatial distribution ensures that the light-absorbing function is achieved without creating visible dark spots or exposure issues.
4Weight of moving object
If porous particles with small amount of opacifying colorant are used, then weight is reduced, but coating precision requirements increase
Solution Approach 1:
The patent utilizes porous particles with specific pore size ranges (1-100 nm) and surface area characteristics (5-50 m²/g) that provide inherent light-scattering properties. This porous architecture allows the use of minimal opacifying colorant (0.001-0.3 wt%) while maintaining high opacity, reducing the sensitivity to coating precision variations that would occur with lower pigment loadings.
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 results in lightweight, high-opacity materials that can be easily tinted and washed, maintaining a light coloration and preventing carbon black exposure, thus enhancing manufacturing efficiency and aesthetic appeal.
Implementation Method 1
Light scattering pigments such as titanium dioxide or clays
Implementation Method 2
an opacifying colorant that absorbs electromagnetic radiation which is visible radiation of from 380nm to 780nm
Implementation Method 3
The radiation can be further weakened or attenuated when the electromagnetic radiation passes through media that have both scattering and absorbing properties
Data Source
AI summary
A light-blocking article is designed to be lightweight but effective to block most incident actinic radiation and can be designed into fabrics, curtains, and other materials. Such an article has an opacifying layer that is capable of blocking predetermined electromagnetic radiation. The article contains (a) porous particles comprising a continuous polymeric binder and pores within the continuous polymeric binder, the porous particles having a glass transition temperature of at least 25°C and a mode particle size of at least 2 μιη and up to and including 50 μm. The article also contains an opacifying colorant that absorbs the predetermined electromagnetic radiation (such as within 400 nm to 700 nm), in an amount of at least 0.001 weight % based on the total dry weight of the opacifying layer, and a matrix polymer in which the porous particles and opacifying colorant are dispersed.