Flame-Retardant Polyurethane Composition for Wire-and-Cable
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing polyurethane-based compositions for wire-and-cable applications lack an optimal balance of burn performance, physical properties, and extrusion performance, particularly in achieving excellent surface smoothness, flexibility, and high flame retardancy while maintaining tensile strength and toughness.
Innovation Solution
A flame-retardant polyurethane composition comprising a thermoplastic polyurethane-based resin component, phosphorus flame retardant particulate filler, and a low melting temperature phosphorus flame retardant agent, with optional additional polymer components, antioxidants, and stabilizers, which provides a continuous resin phase with improved mechanical and thermal properties.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional polyurethane-based compositions are used to achieve flame retardancy, then burn resistance is improved, but extrusion performance and surface smoothness deteriorate
Solution Approach 1:
The patent changes the chemical composition parameters by incorporating specific phosphorus-containing flame retardants (ammonium polyphosphate, melamine cyanurate, tetracyclone) in optimized proportions along with polyurethane resin and plasticizer. This parameter optimization enables the composition to achieve both flame retardancy and acceptable extrusion performance by balancing the flame-retarding properties with processability characteristics.
Solution Approach 2:
The patent creates a composite material system combining polyurethane resin, phosphorus-containing flame retardants, and plasticizer in specific ratios. This composite approach allows the material to simultaneously achieve flame retardancy from the phosphorus compounds while maintaining the flexibility and processability provided by the polyurethane matrix and plasticizer, thus resolving the contradiction between burn resistance and extrusion performance.
2Reliability
If flame retardant additives are increased to improve burn performance, then flame retardancy is improved, but flexibility and tensile strength deteriorate
Solution Approach 1:
The patent optimizes the concentration parameters of flame retardant additives by maintaining them within specific ranges (ammonium polyphosphate: 20-40 parts by weight, melamine cyanurate: 10-30 parts by weight, tetracyclone: 5-20 parts by weight per 100 parts of polyurethane resin). This parameter control ensures sufficient flame retardancy while preventing excessive additive content that would compromise flexibility and tensile strength.
Solution Approach 2:
The patent develops a composite formulation where phosphorus-containing flame retardants work synergistically with the polyurethane resin matrix and plasticizer. The composite structure allows flame retardancy to be achieved through the phosphorus compounds while the polyurethane matrix maintains mechanical properties and flexibility, preventing the deterioration of tensile strength that would occur with high concentrations of flame retardant alone.
3Strength
If thermoplastic polyurethane content is increased to improve mechanical properties, then tensile strength is improved, but melt processability and flexibility deteriorate
Solution Approach 1:
The patent adjusts the molecular weight and composition parameters of the thermoplastic polyurethane resin, selecting specific types (polyester-type, polyether-type, or polyurethane-type) with controlled properties. By optimizing these parameters and combining them with appropriate flame retardant concentrations and plasticizer amounts, the composition achieves good mechanical strength while maintaining melt processability and flexibility.
Solution Approach 2:
The patent creates a composite system where thermoplastic polyurethane resin, phosphorus-containing flame retardants, and plasticizer work together to balance mechanical properties with processability. The polyurethane matrix provides tensile strength while the plasticizer and flame retardant formulation maintain flexibility and melt behavior, preventing the deterioration of processability that would result from high polyurethane content alone.
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 enhanced burn resistance, flexibility, surface smoothness, and extrusion performance, with improved tensile strength and toughness, while passing the VW-1 Small-Scale Vertical Burn Test and reducing formulation costs.
Implementation Method 1
a low melting temperature phosphorus flame retardant agent... When the low melting temperature phosphorus agent is a solid at room temperature, it has a melting temperature less than about 170 degrees Celsius
Implementation Method 2
phosphorus flame retardant particulate filler... low melting temperature phosphorus flame retardant agent... enhanced burn resistance... passing the VW-1 Small-Scale Vertical Burn Test
Data Source
AI summary
The present invention is a flame-retardant polyurethane composition comprising (a) a thermoplastic polyurethane-based resin component, (b) a phosphorus flame retardant particulate filler, and (c) a low melting temperature phosphorus flame retardant agent.