Multilayer Composite Adhesion via Thermoplastic Tie Layer
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Solution Overview
Problem
Existing multilayered composite systems exhibit poor adhesion between layers, which affects their mechanical and functional properties, particularly in applications requiring transparency, flexibility, and durability like packaging and electrical components.
Innovation Solution
A process for preparing multilayered composite materials involving a polyurethane or polyamide film, a tie layer made of thermoplastic adhesive polymer with a melting range of 70° C. to 130° C., and a polyurethane layer, where the adhesive polymer is applied in solid form to the film or polyurethane layer, and the layers are combined using a mold to enhance adhesion.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional composite systems are used, then the structure is simple, but the adhesion between layers is poor
Solution Approach 1:
A tie layer made of thermoplastic adhesive polymer is introduced as an intermediary between the film and polyurethane layer. This tie layer melts at 70-130°C and forms a strong adhesive bond, significantly improving layer adhesion compared to direct bonding methods
Solution Approach 2:
The invention creates a multilayered composite system consisting of a film, a tie layer of thermoplastic adhesive polymer, and a polyurethane layer. This composite structure combines materials with different properties to achieve both good adhesion and desired mechanical characteristics
2Reliability
If the adhesive polymer is applied in solid form, then the adhesion is improved, but the processing temperature must be controlled precisely
Solution Approach 1:
The adhesive polymer is selected with a specific melting range of 70-130°C, which allows it to be applied in solid form and then activated by controlled heating. This parameter selection enables precise temperature control during processing while ensuring strong adhesion when bonded
3Strength
If a tie layer is added to improve adhesion, then the mechanical properties are improved, but the number of layers increases
Solution Approach 1:
The tie layer is applied locally as a bonding layer between the film and polyurethane layer. This localized application of thermoplastic adhesive polymer provides enhanced mechanical properties and adhesion only where needed, rather than throughout the entire structure
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 resulting composite materials demonstrate improved mechanical properties, such as rubbing fastness and buckling strength, along with superior storage and aging properties, while maintaining agreeable visual and tactile characteristics, and are easily cleanable.
Implementation Method 1
a tie layer made of thermoplastic adhesive polymer with a melting range from 70° C. to 130° C.
Implementation Method 2
the adhesive polymer is applied in solid form to the film (A) and/or to polyurethane layer (C)
Data Source
AI summary
Provided herein is a process for the preparation of multilayered composite materials, and also multilayered composite materials which can be obtained according to this process.