Airbag Multilayer Composite With Balanced Adhesion and Flexibility
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Solution Overview
Problem
Existing airbag multilayer complexes face issues with durability due to poor adhesion between the adhesive layer and the base fabric, leading to interface peeling during deployment, especially under repeated stress and heat exposure, which affects their longevity and reliability.
Innovation Solution
The airbag multilayer complex is designed with a specific balance of adhesive strength and flexibility by using a multilayer film with an adhesive layer containing a hydrogen-bonding resin, a polyamide-based copolymer, and a thermoplastic polyamide elastomer, ensuring an adhesive strength of 5 N/cm or more and a difference in loop stiffness of 130 mN/cm or less between the multilayer complex and the base fabric.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a resin film is laminated on the base fabric to improve airtightness, then the airtightness is improved, but the adhesion between the adhesive layer and base fabric deteriorates, causing interface peeling during deployment
Solution Approach 1:
The patent controls the gel fraction of the adhesive layer within 30-80% to optimize the balance between adhesion and flexibility. By adjusting this physical parameter, the adhesive layer maintains sufficient bonding strength to prevent interface peeling while retaining enough elasticity to accommodate deployment stresses without cracking or delaminating.
Solution Approach 2:
The patent uses a composite adhesive layer combining rubber polymer and resin polymer in specific proportions (rubber polymer 20-80 parts by mass, resin polymer 20-80 parts by mass). This composite structure leverages the elastic properties of rubber for flexibility and the bonding properties of resin for adhesion, resolving the contradiction between maintaining strong attachment and preserving deployment flexibility.
2Reliability
If the adhesive layer has high adhesive strength to prevent interface peeling, then the durability is improved, but the flexibility and loop stiffness difference deteriorates, affecting deployment performance
Solution Approach 1:
The patent controls the gel fraction within 30-80% and specifies the rubber polymer-to-resin polymer ratio (20-80 parts by mass rubber to 20-80 parts by mass resin). These parameter controls ensure the adhesive layer has optimal balance: enough crosslinking for durability and peel resistance, but sufficient polymer chain mobility for flexibility and acceptable loop stiffness difference during deployment.
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
This configuration enhances the durability and flexibility of the airbag multilayer complex, improving its scrub resistance and maintaining adhesion over time, even under repeated stress and heat, thereby ensuring reliable deployment and inflation.
Implementation Method 1
the adhesive layer contains a first resin having a hydrogen-bonding capacity
Implementation Method 2
in the case of thermal lamination of the resin film to the base fabric
Data Source
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AI summary
It is provided an airbag multilayer complex excellent in flexibility and durability by controlling adhesion between an adhesive layer and a base fabric to a predetermined range, and an airbag using it. This disclosure is an airbag multilayer complex comprising a base fabric and a multilayer film including an outer layer and an adhesive layer that is bonded to one surface of the base fabric. The adhesive strength of the interface between the multilayer film and the base fabric is 5 N/cm or more, the difference in loop stiffness between the airbag multilayer complex and the base fabric is 130 mN/cm or less, the adhesive layer contains a first resin having a hydrogen-bonding capacity, and the difference in Hansen solubility parameter (ΔHSP) between the base fabric and the first resin is 5 MPa0.5 or less.