PVC Flame-Retardant Composition for Low-Smoke Cable Insulation
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Solution Overview
Problem
PVC compositions used in electrical wires and cables exhibit toxicity and generate significant opaque smoke under fire conditions, compromising safety and regulatory compliance, while existing flame-retardant additives like ATO and chlorinated paraffins are toxic and expensive.
Innovation Solution
A combination of polyvinyl chloride (PVC) with a plasticizer, a hydrated inorganic filler, and a molybdate or stannate deposited on an inorganic support is used, eliminating ATO and reducing smoke generation while maintaining fire-retardant properties and heat release profiles.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If ATO and chlorinated paraffins are used as flame-retardant additives, then fire-retardant properties are improved, but toxicity and smoke generation increase
Solution Approach 1:
The invention extracts and removes the toxic components (ATO and chlorinated paraffins) from the flame-retardant system while retaining the essential fire-retardant function through alternative additives that do not produce toxic smoke
Solution Approach 2:
The invention employs a composite additive system combining magnesium hydroxide, aluminium hydroxide, and molybdate/stannate compounds that work synergistically to provide fire-retardant protection without the toxic effects of traditional ATO-based systems
2Reliability
If ATO is used to achieve non-propagation of fire, then fire-retardant effect is improved, but smoke opacity increases significantly
Solution Approach 1:
The invention changes the chemical composition parameters of the flame-retardant system by replacing ATO with magnesium hydroxide, aluminium hydroxide, and molybdate/stannate compounds, which alter the combustion chemistry to produce less opaque smoke while maintaining fire-retardant effectiveness
3Object-generated harmful factors
If molybdate additives are used to reduce smoke, then smoke generation is reduced, but cost increases significantly
Solution Approach 1:
The invention merges molybdate or stannate compounds with commonly used hydrated inorganic fillers (magnesium hydroxide and aluminium hydroxide) to create a synergistic flame-retardant system that achieves smoke reduction at lower cost than using pure molybdate additives
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 effectively reduces smoke production and toxicity, facilitating safer evacuation and compliance with regulatory standards, while being cost-effective and maintaining fire-retardant performance comparable to ATO-based systems.
Implementation Method 1
it is known that it acts in synergy with chlorine (resulting from PVC and/or from plasticizers of chlorinated paraffin types, such as MCCP, often employed in combination with ATO) to provide a fire-retardant (non-propagating) effect
Implementation Method 2
a hydrated inorganic filler
Implementation Method 3
hydrated inorganic filler... to provide a fire-retardant (non-propagating) effect
Data Source
AI summary
The present invention relates to a polymer composition suitable for the production of a layer having flame-retardant properties and having low release of smoke, said composition comprising: (a) polyvinyl chloride (PVC); (b) a plasticizer for polyvinyl chloride; (c) a hydrated inorganic filler; and (d) a molybdate and/or a stannate deposited on a support.