Air Bag Base Fabric Coating for Low Viscosity and Strong Adhesion
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Solution Overview
Problem
Existing air bag coating compositions fail to achieve the required low viscosity and strong adhesion to the air bag base fabric, leading to inadequate retention of gas pressure and increased leakage in air bags during collisions and roll-over accidents.
Innovation Solution
A method involving preliminary treatment of textile fabrics with an organosilicon compound containing an epoxy group and alkoxy groups, followed by application of a liquid silicone rubber coating composition comprising organopolysiloxane, organohydrogenpolysiloxane, an addition catalyst, fine powder silica, and an organometallic compound, and subsequent curing to form a silicone rubber coating layer with improved adhesion and reduced viscosity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If conventional silicone rubber compositions are used for air bag coating, then the coating can be formed on the textile surface, but the viscosity is too high and adhesion to the base fabric is insufficient
Solution Approach 1:
The patent modifies the chemical composition parameters of the silicone rubber coating by incorporating specific organosilicon compounds with epoxy groups and alkoxy groups bonded to silicon atoms. This changes the molecular structure and intermolecular forces, resulting in both reduced viscosity and enhanced adhesion properties simultaneously
Solution Approach 2:
The patent creates a composite coating composition by combining silicone rubber base polymers with organosilicon compounds containing epoxy groups and alkoxy groups. This composite formulation achieves synergistic effects where the organosilicon compounds provide both flow improvement (lower viscosity) and bonding enhancement (stronger adhesion)
2Reliability
If the coating composition has strong adhesion, then the air bag can retain gas pressure, but the viscosity increases making coating difficult
Solution Approach 1:
The patent adjusts the chemical parameters of the coating composition by selecting organosilicon compounds with specific molecular weights and functional group ratios. The epoxy groups provide crosslinking for gas pressure retention while the alkoxy groups maintain low viscosity, achieving both reliability and ease of manufacture
3Duration of action of stationary object
If the air bag base fabric uses conventional coating, then the fabric structure is simple, but the air bag cannot retain inflated state for required period
Solution Approach 1:
The patent develops a composite coating formulation combining silicone rubber with organosilicon compounds containing epoxy and alkoxy groups. This composite structure provides extended inflated state retention through improved adhesion and crosslinking, while the formulation complexity is managed by using a limited number of specifically selected components
Solution Approach 2:
The organosilicon compounds act as intermediary substances between the silicone rubber coating and the textile base fabric. The epoxy groups form strong bonds with the fabric while the alkoxy groups maintain coating fluidity, serving as a mediating layer that extends the inflated state retention period
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 method produces an air bag base fabric with a silicone rubber coating that suppresses gas leakage and maintains the inflated state for a sufficient period, enhancing safety in collisions and roll-over accidents.
Implementation Method 1
preliminarily treating at least one surface of a textile fabric with (F) an organosilicon compound containing an epoxy group and an alkoxy group bonded to silicon atoms in one molecule
Implementation Method 2
coating the at least one treated surface of the substrate with a liquid silicone rubber coating composition having a particular formulation, and curing the composition to form a silicone rubber coating layer
Data Source
AI summary
A method for producing an air bag base fabric which has a silicone rubber coating layer on at least one surface of a substrate is provided. The silicone rubber coating layer is prepared by curing a liquid silicone rubber coating composition having the low viscosity required in the coating and excellent adhesion to the air bag base fabric. An air bag base fabric produced by this method is also provided. In this method, an air bag base fabric is produced by preliminarily treating at least one surface of the textile fabric with an organosilicon compound containing an epoxy group and an alkoxy group bonded to a silicon atom in one molecule to prepare a substrate fabric containing about 0.01 to 5 parts by weight of the organosilicon compound, and coating and curing the liquid silicone rubber coating composition of particular formulation on the substrate.