Foam Board Surfacing Composition for Alkali and Fire Resistance
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Solution Overview
Problem
Surfacing products for organic foam boards in composite external thermal insulation systems face challenges due to sensitivity to alkaline substances, which degrades mechanical properties and thermal insulation, while adding protective layers to enhance resistance reduces fire resistance.
Innovation Solution
A surfacing product with a glass veil bonded by an elastomeric binder containing an organic elastomer and ammonium sulfamate, along with a hydrophobic coating comprising mineral particles and a crosslinked organic polymer, is developed to enhance alkaline resistance and fire resistance without compromising mechanical properties or increasing the higher calorific value.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a protective organic layer is added to reduce sensitivity to alkalis, then alkali resistance is improved, but fire resistance deteriorates
Solution Approach 1:
The invention changes the chemical composition parameters of the binder by incorporating ammonium sulfamate (8-18% by mass) as a flame-retardant agent alongside the organic elastomer. This parameter modification allows the binder to maintain alkali resistance while achieving fire resistance without requiring a separate protective organic layer that would compromise fire performance.
Solution Approach 2:
The invention creates a composite binder system combining organic elastomer (for adhesion and flexibility) with inorganic ammonium sulfamate (for flame retardancy and alkali resistance). This composite approach integrates multiple functions within a single material layer, eliminating the need for additional protective coatings that would reduce fire resistance.
2Strength
If the glass veil is used for surfacing, then mechanical strength is improved, but sensitivity to alkaline substances increases
Solution Approach 1:
The elastomeric binder acts as an intermediary protective layer between the glass veil and alkaline substances (adhesive mortar and finishing mortar). This mediator prevents direct contact between the alkaline materials and the glass fibers, protecting the mechanical strength of the surfacing product while allowing the glass veil to provide its reinforcing function.
Solution Approach 2:
The invention modifies the chemical environment of the glass veil by using a specifically formulated binder containing ammonium sulfamate, which creates a protective interface that reduces the reactivity between alkaline substances and glass fibers, thereby maintaining mechanical properties in alkaline conditions.
3Reliability
If hydrophobic coating is added to increase water resistance, then hydrophobicity is improved, but fire resistance may be reduced
Solution Approach 1:
The invention modifies the chemical composition of the hydrophobic coating by incorporating mineral flame retardant particles (75-90% by mass) alongside the cross-linked organic polymer (10-25% by mass). This parameter adjustment ensures that the coating provides water resistance through hydrophobic polymer chains while the mineral particles contribute fire resistance, preventing the trade-off between these two properties.
Solution Approach 2:
The hydrophobic coating is formulated as a composite material combining cross-linked organic polymer (for hydrophobicity and adhesion) with mineral flame retardant particles (for fire resistance). This composite structure integrates both required functions within a single coating layer, avoiding the need to choose between hydrophobicity and fire resistance.
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 maintains mechanical properties after water and alkaline aging tests, increases hydrophobicity, and retains fire resistance, ensuring the surfacing product's effectiveness in composite external thermal insulation systems.
Implementation Method 1
the selection of a specific mineral flame retardant and a restricted range of quantities of this flame retardant
Implementation Method 2
increase the hydrophobic character of surfacing products and thermal insulation products containing them, without significantly reducing the fire resistance of the products
Implementation Method 3
a glass veil bonded by an elastomeric binder
Data Source
AI summary
The present invention relates to a surfacing product for foam boards, comprising a glass mat bound by an elastomer binder, characterized in that the elastomer binder contains (a) an organic elastomer and (b) from 8% to 18% by weight of ammonium sulfamate relative to the sum of organic elastomer and ammonium sulfamate, a thermal insulation product comprising a foam board and such a surfacing product, and also an external thermal insulation composite system using such a thermal insulation product.