Lignin-Based Intumescent Flame Retardant for Halogen-Free Plastics
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Solution Overview
Problem
Current flame retardant materials for plastics often contain halogens, which are harmful to human health and the environment, and alternative halogen-free materials like metal hydroxides require high concentrations, while phosphorus-based materials can be mobile and leach out of the polymeric matrix, necessitating a stable and environmentally friendly solution.
Innovation Solution
A halogen-free, solid intumescent flame retardant system based on a lignin-based composition, a carbonyl source, and a phosphorus oxide compound, chemically coupled to create a synergistic material with enhanced intumescent properties, low water solubility, and high thermal stability, utilizing waste stream biomass for eco-friendly production.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If halogen-containing flame retardant materials are used, then flame retardant effect is achieved, but harm to human health and environment increases
Solution Approach 1:
The patent converts the traditionally harmful halogen-containing materials into beneficial halogen-free alternatives by using renewable lignin and phosphorus-based compounds. The intumescent system forms a protective char layer that provides flame retardancy without releasing toxic halogen gases, thus converting the search for effective FR into an opportunity for environmentally benign solutions.
Solution Approach 2:
The patent changes the chemical composition parameters from halogen-based to phosphorus-based flame retardants. By adjusting the molecular structure and cross-linking density of the lignin-phosphorus complex, the material achieves effective flame retardancy through intumescence mechanism while eliminating harmful halogen content.
2Object-affected harmful factors
If metal hydroxide additives are used, then environmental requirements are met, but concentration needed is high
Solution Approach 1:
The patent creates a composite intumescent system combining lignin, phosphorus compounds, and cross-linking agents. This composite structure provides synergistic effects where the phosphorus catalyst triggers rapid char formation and gas release, achieving flame retardancy at lower concentrations compared to metal hydroxides used alone.
Solution Approach 2:
The patent changes the physical state and reactivity parameters by using organic phosphorus compounds instead of inorganic metal hydroxides. The phosphorus-based system undergoes exothermic decomposition at lower temperatures, triggering intumescence at lower additive concentrations while maintaining environmental safety.
3Reliability
If low molecular weight phosphorus-based FRs are used, then flame retardant properties are achieved, but mobility and leaching increase
Solution Approach 1:
The patent creates a cross-linked composite network where phosphorus compounds are chemically bound to lignin macromolecules through covalent bonds. This network structure restricts molecular mobility and prevents leaching, while the phosphorus catalyst sites remain active for triggering intumescence during fire exposure.
Solution Approach 2:
The patent segments the flame retardant system into distinct functional domains: lignin provides structural framework and char-forming capability, phosphorus compounds provide catalytic activity for intumescence, and cross-linking agents provide structural integrity. This segmentation allows each component to optimize its function while maintaining overall stability.
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 provides a cost-effective, environmentally friendly flame retardant additive for plastics that maintains mechanical properties and effectively prevents fire spread without water solubility issues, utilizing waste biomass for sustainable production and sulfur scrubbing.
Implementation Method 1
A halogen-free, solid intumescent flame retardant system based on a lignin-based composition, a carbonyl source, and a phosphorus oxide compound
Implementation Method 2
exposure to heat causes the material to release gases that lead to an increase in volume as a foamed material
Implementation Method 3
adding the phosphorous pentoxide results in an exothermic reaction, and step (ii) is devoid of external heating
Data Source
AI summary
The present invention relates to environmentally friendly flame retardant materials based on renewable resources and industrial waste streams. The materials have advantageous intumescent properties, charring, gas phase radical traps and thermal stability. The present invention further relates to processes for the preparation of the flame retardant materials and to plastic materials comprising said flame retardant materials.