Single-Layer Airbag Coating for Flame Retardance and Seam Integrity
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Solution Overview
Problem
Current airbag coating technologies require multiple layers to achieve gas retention, flame retardance, and anti-blocking properties, which increases material and manufacturing costs, and can lead to issues like seam failure and degradation over time.
Innovation Solution
A monolithic coating composition comprising a blend of inherently flame-retardant and gas-retaining urethanes, where the flame-retardant urethane is produced by reacting a halogenated diol with an isocyanate, and the gas-retaining urethane has high tensile strength and elongation, applied as a single layer to airbag fabrics.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If multiple coating layers are used to achieve gas retention and flame retardance, then the desired performance properties are improved, but the device complexity and manufacturing cost increase
Solution Approach 1:
The patent combines gas retention and flame retardance functions into a single monolithic coating layer by blending a gas-retaining polymer (silicone-containing polymer) with a flame-retardant polymer containing nitrogen and phosphorus, eliminating the need for separate coating layers while maintaining both performance properties
Solution Approach 2:
The invention uses a composite coating material consisting of a blend between a gas-retaining polymer and a flame-retardant polymer with specific chemical composition (nitrogen and phosphorus containing), creating a multi-functional material that simultaneously provides gas retention, flame retardance, and reduced blocking tendency
2Duration of action of moving object
If silicone-based materials are used to improve gas retention, then air retention time is improved, but the coating allows yarn shifting under stress which can lead to seam failure
Solution Approach 1:
The patent creates a composite coating material blending silicone-containing polymer for gas retention with nitrogen and phosphorus containing flame-retardant polymer that provides structural reinforcement, preventing yarn shifting while maintaining air retention time
Solution Approach 2:
The flame-retardant polymer component is specifically designed to provide localized reinforcement at the coating-fabric interface, restricting yarn movement at stress points while the silicone component maintains gas retention properties in the bulk coating
3Reliability
If a second protective layer is added to prevent blocking and protect from aging, then the coating protection is improved, but the manufacturing process and material usage become more complex
Solution Approach 1:
The patent merges the protective functions (anti-blocking and aging resistance) into the single monolithic coating layer through the specific polymer blend composition, eliminating the need for a separate protective top layer while maintaining protection against blocking and environmental degradation
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 single-layer coating system effectively retains gas, prevents flame propagation, and maintains stability against aging and heat, eliminating the need for additional layers and reducing manufacturing complexity while ensuring airbag integrity.
Implementation Method 1
the flame-retardant urethane is produced by reacting a halogenated diol with an isocyanate
Data Source
AI summary
Provided herein are specific coating compositions, which are used as a monolithic coating layer for airbags. Preferably, these coating compositions are comprised of urethanes, which are blended together, where at least one of the urethane components is inherently flame retardant and the other of which is a urethane with gas-retaining properties. The gas-retaining urethane may be characterized as having high tensile strength at break, high elongation at break, and a 100% modulus less than 2,000 p.s.i. The inherently flame retardant urethane is the result of a manufacturing process in which a halogenated diol is reacted with an isocyanate, resulting in the incorporation of halogens into the polyurethane backbone. The resulting coating compositions (that is, the blends of gas-retaining urethane and flame retardant urethane), when applied as a single layer to an airbag fabric, result in an airbag with good gas retention, flame retardance, anti-blocking properties, and aging stability.