Thermoplastic Intermediate Layer for Composite Bonding and Separation
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Solution Overview
Problem
Current methods for recycling multi-material composite components, particularly those with thermoplastic and thermoplastic elastomer combinations, face challenges in separation due to lack of effective techniques, leading to devaluation of thermoplastics and environmental issues like gas diffusion in pipes.
Innovation Solution
A thermoplastic intermediate layer is introduced between components, which can be physically stimulated to soften or melt during recycling, allowing for separation without affecting the other plastic components, using materials like polyethylene-n-butyl acrylate grafted with maleic anhydride or induction-affinous additives for adhesion and separation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If a thermoplastic intermediate layer is used to bond different plastic components, then adhesion between components is improved, but separation for recycling becomes difficult
Solution Approach 1:
The patent applies parameter changes by selecting an intermediate layer material with a melting temperature specifically lower than that of the bonded plastic components. This temperature parameter differentiation enables the intermediate layer to remain stable during normal use (maintaining adhesion) while melting at lower temperatures during recycling (enabling separation). The intermediate layer's melting point is deliberately chosen to create a temperature window that satisfies both bonding and separability requirements.
Solution Approach 2:
The patent segments the composite structure into distinct functional layers: the intermediate bonding layer and the structural plastic components. This segmentation allows each layer to have optimized properties - the intermediate layer provides bonding and separability, while the plastic components provide structural integrity. The segmentation enables independent processing of each layer during recycling, with the intermediate layer being removed first through melting.
2Ease of manufacture
If conventional plastic processing methods are used to create bonds, then manufacturing simplicity is maintained, but bond strength between hard and soft components is insufficient
Solution Approach 1:
The patent introduces an intermediate layer as a mediator between hard and soft plastic components. This intermediate layer serves dual functions: it provides adequate bonding strength between incompatible materials and enables subsequent separation through its lower melting temperature. The intermediate layer acts as a chemical and thermal bridge that reconciles the incompatibility between different plastic types while maintaining processing simplicity.
3Adaptability or versatility
If thermoplastic and TPE are combined for functional integration, then component functionality is enhanced, but recycling options are reduced
Solution Approach 1:
The patent resolves the recycling value loss by changing the thermal parameter (melting temperature) of the intermediate layer. This parameter differentiation allows the composite to maintain functional integration during use while enabling material recovery during recycling. The intermediate layer's lower melting point creates a separation mechanism that recovers high-value thermoplastics for reuse in high-performance applications.
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
Enables the reuse of thermoplastics by allowing clear separation and recycling, prolonging plastic circulation and conserving resources, while maintaining material integrity during use.
Implementation Method 1
a subsequent deliberate stimulation of this intermediate layer on a physical basis for softening and/or melting, and thus separation of the plastic components
Implementation Method 2
The bonding is achieved through heating and/or melting of the intermediate layer
Data Source
Figure 1~2
Figure 3A
Figure 3B
AI summary
Method for producing a multi-component composite component, (100) with at least two polymer bodies (10, 20) which are metallurgically bonded together and which each consist of different thermoplastic polymers TK1, TK2, wherein a first polymer body (10) is produced which consists of a first thermoplastic polymer TK1, and a second polymer body (20) which consists of a second thermoplastic polymer TK2 and which is metallurgically bonded to the first polymer body (10), characterized in that - a thermoplastic adhesive interlayer (30) is inserted between the polymer bodies (10, 20), via which the first and the second polymer bodies (10, 20) are metallurgically bonded together and - the adhesive interlayer (30) is formed from a third thermoplastic polymer TK3 which is softenable or meltable at a temperature,in which the respective softening temperature or melting temperature is not reached for the two plastic bodies (10, 20).