Halogen-Free Cable Composition for Low-Smoke Flame Retardance
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Solution Overview
Problem
Current flame retardant materials for cables lack effective smoke suppression and halogen-free formulations, which can lead to toxic and corrosive smoke emission during combustion, and often require high loading levels of flame retardant fillers, compromising mechanical properties.
Innovation Solution
A flame retardant composition comprising a blended matrix of polyolefin and nitrogen-containing polymers with a polyoxometalate ionic liquid (PIL) and an inorganic synergist carrier, which forms a char layer that impedes burning, reduces smoke production, and operates at lower filler loading levels, enhancing mechanical properties while being halogen-free.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If high loading levels of flame retardant fillers are used, then flame retardant performance is improved, but mechanical properties are compromised
Solution Approach 1:
The invention changes the chemical parameters of the flame retardant system by using a polyoxometalate ionic liquid instead of traditional halogenated compounds. This chemical substitution allows achieving effective flame retardancy at lower loading levels (1-5 wt%), thereby preserving the mechanical properties of the polymer matrix while maintaining reliable flame protection.
Solution Approach 2:
The invention creates a composite flame retardant system combining polyoxometalate ionic liquid with a carrier material (such as silica, alumina, or metal organic frameworks). This composite approach enhances the flame retardant efficiency and allows lower overall loading in the polymer matrix, thus maintaining mechanical integrity while achieving effective fire protection.
2Reliability
If traditional flame retardant materials are used, then flame retardance is achieved, but toxic and corrosive smoke emission occurs during combustion
Solution Approach 1:
The invention converts the harmful combustion process into a beneficial char-forming process. The polyoxometalate ionic liquid promotes charring and carbonization of the polymer matrix during fire exposure, creating a protective char layer that suppresses smoke generation and prevents the release of toxic and corrosive gases, thereby transforming a harmful combustion scenario into a protective response.
Solution Approach 2:
The polyoxometalate ionic liquid creates an inert-like protective environment during combustion by forming a stable char layer that acts as a physical barrier. This char layer suppresses the combustion process and prevents the formation and release of toxic and corrosive smoke, effectively creating a protective inert environment around the burning material.
3Reliability
If halogen-containing flame retardants are used, then flame retardant effectiveness is improved, but halogen-free formulations are required for safety
Solution Approach 1:
The invention fundamentally changes the chemical composition parameter by replacing halogen-containing flame retardants with a polyoxometalate ionic liquid based on oxygen, phosphorus, and other non-halogen elements. This substitution maintains effective flame retardant performance while eliminating halogen content, satisfying safety requirements for halogen-free formulations in cable applications.
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 composition achieves superior flame retardance with reduced smoke production and lower filler loading, maintaining mechanical integrity, and meets stringent flame retardant standards, making it suitable for cable applications.
Implementation Method 1
forms a char layer that impedes burning, reduces smoke production
Implementation Method 2
superior flame retardance with reduced smoke production
Data Source
Figure 1~2
Figure 3
AI summary
Embodiments of a flame retardant composition are provided. The composition includes from 55% to 85% by weight of a blended matrix and from 15% to 45% by weight of a flame retardant package distributed within the blended matrix. The blended matrix includes a compatibilizer, a polyolefin component and a nitrogen-containing polymer component. In particular, the nitrogen-containing polymer component has a melting temperature of less than 240 °C. The flame retardant package includes an acid source, a carbon source, a polyoxometalate ionic liquid, and a synergist. The flame retardant composition can be utilized in cables, such as fiber optic cables.