Metallized Textile Bonding for Solar Reflection and Fire Resistance
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Solution Overview
Problem
Current solar protection fabrics with metal deposits on their surface struggle to achieve high solar reflection indices (Rs >= 70%) while maintaining fire resistance classifications like M0 or A2s1d0, as organic binders used in existing methods prevent the incorporation of flame retardants, leading to inadequate fireproofing.
Innovation Solution
A metallized textile with a polymeric intermediate layer formed by a coupling polymer that establishes chemical bonds between the textile and metal layers, using flame retardant agents distributed within the polymer matrix, ensuring solid adhesion and compatibility with halogen-free compositions for enhanced fire resistance and solar reflection.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If a metal deposit is applied on the exterior face of the blind to achieve high solar reflection (Rs >= 70%), then the solar protection performance is improved, but the fire resistance classification deteriorates due to the use of organic binders that are combustible
Solution Approach 1:
The patent introduces a silane-based coupling agent as an intermediary layer between the textile substrate and the metal deposit. This coupling agent contains reactive groups that form chemical bonds with both the textile and the metal, eliminating the need for combustible organic binders while ensuring strong adhesion of the metal layer to the textile surface, thereby achieving both high solar reflection and fire resistance
Solution Approach 2:
The patent changes the chemical composition parameters of the binding layer by replacing organic binder-based systems with an inorganic silane-based coupling agent system. This parameter change transforms the binding mechanism from organic adhesion to silane chemistry, enabling the incorporation of flame retardants and achieving fire resistance classification M0 or A2s1d0 while maintaining metal deposit adhesion
2Illumination intensity
If an organic binder is used to deposit metal particles or transfer film to achieve metallic appearance and solar reflection, then the aesthetic and optical properties are improved, but the fireproofing capability deteriorates as flame retardants cannot be incorporated
Solution Approach 1:
The silane coupling agent serves as an intermediary that replaces the organic binder function. It provides the necessary adhesion between metal particles and textile while being compatible with flame retardant incorporation, thus eliminating the harmful effect of combustible organic materials while maintaining the desired metallic appearance and solar reflection properties
Solution Approach 2:
The patent creates a composite system consisting of the textile substrate, silane coupling agent, metal particles, and flame retardants. This composite structure integrates multiple materials with complementary properties: the silane provides adhesion, the metal provides solar reflection and appearance, and the flame retardants provide fire protection, achieving all required performance criteria simultaneously
3Illumination intensity
If a vacuum metallization operation is used to deposit pure aluminum on the fabric surface to achieve high solar reflection, then the optical performance is improved, but the adhesion of the metal layer to the textile deteriorates
Solution Approach 1:
The silane coupling agent acts as a mediator between the vacuum-deposited aluminum layer and the textile substrate. Applied before metallization, it creates a chemically active surface that forms strong bonds with the aluminum vapor during vacuum deposition, ensuring excellent adhesion of the pure aluminum layer to the textile without requiring additional organic coating layers
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 achieves Rs indices greater than or equal to 70% with excellent fire resistance classifications like M0 or A2s1d0, ensuring both high solar reflection and fire safety without the use of halogenated compounds, through the use of a polymeric intermediate layer that chemically bonds the metal and textile layers.
Implementation Method 1
the connection between the textile layer and the metal layer is ensured by a polymeric intermediate layer formed of a matrix comprising at least one coupling polymer in which at least one flame retardant agent is distributed, said coupling polymer being linked by chemical bonds, on the one hand to the textile layer and, on the other hand, to the metal layer
Implementation Method 2
The function of the silane is to create a crosslink between the glass fabric and the polyurethane
Implementation Method 3
The deposition of a layer of aluminum on the surface of the fabric by a vacuum metallization operation
Implementation Method 4
The performance of solar protection fabrics is, in particular, characterized by thermal indices, which characterize the transmitted part (Ts) and the reflected part (Rs) of solar radiation
Data Source
AI summary
The subject of the present invention is a textile metallized over at least one of the faces thereof comprising a textile layer of inorganic fibres and a metallic layer, characterized in that the bond between the textile layer and the metallic layer is provided by a polymeric intermediate layer formed from a matrix comprising at least one coupling polymer in which at least one flame retardant is distributed, said coupling polymer being bonded by chemical bonds on the one hand to the textile layer and on the other hand to the metallic layer. The present invention also relates to the process for manufacturing this metallized textile.