VAE Carpet Coating for Flame Retardancy Without Added FRs
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Conventional carpet products face challenges in achieving desirable flame retardancy and low smoke generation without external flame retardant additives, while also being resistant to degradation from light and UV radiation, and having low volatile organic compound (VOC) content.
Innovation Solution
The development of carpet products with a coating and/or adhesive layer formed from an emulsifier-stabilized vinyl acetate/ethylene (VAE) copolymer dispersion, which includes specific co-monomers, cross-linkers, and fillers, providing a balance of properties such as low flammability, resistance to degradation, and low VOC content, without the use of external flame retardants like alumina trihydrate.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional binders like styrene-butadiene latex are used, then good adhesion and flexibility are achieved, but flame retardancy and resistance to UV degradation are poor
Solution Approach 1:
The patent changes the chemical composition parameters of the binder by using vinyl ester copolymers (specifically vinyl acetate/ethylene copolymers) instead of conventional styrene-butadiene latex. This parameter change provides inherent flame retardancy and UV resistance without requiring additional additives, thus resolving the contradiction between achieving reliability (flame retardancy) and resistance to harmful factors (UV degradation).
Solution Approach 2:
The patent employs composite material strategy by combining vinyl ester copolymer with inorganic fillers (such as calcium carbonate, clay, barite, feldspar, cullet, fly ash, and recycled carpet backing) to create a coating composition that achieves flame retardancy and UV resistance. The composite formulation enhances both flame retardant properties and resistance to degradation while maintaining adhesion and flexibility.
2Reliability
If external flame retardant additives like alumina trihydrate are added, then flame retardancy is improved, but formulation complexity and cost increase
Solution Approach 1:
The patent extracts and eliminates the need for external flame retardant additives by using vinyl ester copolymers that inherently provide flame retardant properties. This takes out the requirement for separate flame retardant components (such as alumina trihydrate), thereby reducing formulation complexity while maintaining or improving flame retardancy.
Solution Approach 2:
The vinyl ester copolymer binder serves itself by providing inherent flame retardant properties without requiring additional flame retardant additives. The copolymer structure itself contributes to flame resistance, enabling the coating to be self-sufficient in achieving both adhesion and flame retardancy, thus reducing formulation complexity.
3Reliability
If vinyl ester copolymers are used, then flame retardancy and UV resistance are improved, but compatibility with conventional latex coating processes must be ensured
Solution Approach 1:
The patent adjusts the parameters of the vinyl ester copolymer formulation, specifically controlling the glass transition temperature (Tg) and composition ratios, to ensure compatibility with conventional latex coating processes. By optimizing these parameters, the copolymer can be processed using existing equipment and methods while maintaining inherent flame retardant properties.
Solution Approach 2:
The vinyl ester copolymer is designed to serve multiple functions: it provides adhesion as a binder, inherent flame retardancy, UV resistance, and compatibility with conventional latex coating processes. This multi-functionality allows the material to replace conventional binders while maintaining ease of manufacture through existing processes.
4Quantity of substance
If high filler loading is used in coating, then cost and performance are improved, but application viscosity and processing difficulty increase
Solution Approach 1:
The patent modifies the chemical composition parameters of the binder system by using vinyl ester copolymers with specific Tg ranges and molecular weight characteristics. These parameter changes improve the rheological properties of the coating, allowing high filler loadings to be achieved while maintaining acceptable application viscosity and ease of processing.
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 VAE-based carpet products exhibit excellent flame retardancy, low smoke generation, and resistance to light and UV degradation, with improved formulation simplicity and cost-effectiveness, while maintaining low VOC emissions and avoiding toxic components like polyvinyl chloride and bitumen.
Implementation Method 1
an emulsifier-stabilized vinyl acetate/ethylene (VAE) copolymer dispersion
Data Source
AI summary
Disclosed are carpet products comprising at least one flexible substrate and at least one coating and/or adhesive layer associated with the at least one flexible substrate. The coating and/or adhesive layer is formed from an aqueous composition comprising: A) an emulsifier-stabilized vinyl acetate/ethylene (VAE) emulsion copolymer dispersion and B) at least one particulate filler material selected from particulate inorganic compounds and particulate plastic material. The vinyl acetate/ethylene copolymer in the copolymer dispersion has a selected ethylene content or glass transition temperature. It is also preferably substantially free of cross-linkable co-monomer moieties which generate formaldehyde upon curing and preferably has a particle size, dw, ranging from about 50 to about 500 nm. The carpet product is substantially free of polyvinyl chloride and bitumen and exhibits a Class B1 flame-retardancy in accordance with DIN 4102-14, corresponding to a critical heat flux of ≧about 4.5 kW/m2.