Cyclic Imide Adhesive Bonding Low-Surface-Energy Plastics
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Low-surface-energy substrates such as polyethylene, polypropylene, and polytetrafluoroethylene are difficult to bond using traditional adhesives, requiring complex and costly surface treatment methods, making them unsuitable for retail consumers or low-volume operations.
Innovation Solution
A composition comprising a blend of monomers including cyclic imide-containing acrylates or methacrylates and an organoborane complex, which can be used as a two-part adhesive, providing strong adhesion to metals like galvanized steel without the need for surface treatment.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If traditional adhesives are used to bond low-surface-energy substrates, then adhesion strength is insufficient, but surface treatment methods can improve adhesion at the cost of process complexity and cost
Solution Approach 1:
The invention changes the chemical composition parameters of the adhesive by incorporating cyclic imide-containing monomers (such as N-phthalimidoethyl methacrylate) in specific concentrations (5-50 wt%). This chemical parameter change enables the adhesive to bond low-surface-energy substrates effectively without requiring surface treatment, thus improving adhesion strength while avoiding the complexity of surface treatment processes
Solution Approach 2:
The invention creates a composite adhesive system by combining cyclic imide-containing monomers with other monomers (acrylates, methacrylates), oligomers, and initiators. This composite formulation synergistically achieves strong adhesion to low-surface-energy substrates like polyethylene and polypropylene without requiring complex surface preparation, resolving the contradiction between adhesion strength and process simplicity
2Strength
If surface treatment methods are applied to low-surface-energy substrates, then adhesion performance is improved, but processing time and operational complexity increase
Solution Approach 1:
The invention extracts and eliminates the need for surface treatment steps from the bonding process. By incorporating cyclic imide-containing monomers directly into the adhesive formulation, the patent achieves effective adhesion to low-surface-energy substrates without requiring flame treatment, corona discharge, plasma treatment, or other time-consuming surface preparation methods, thus reducing processing time while maintaining adhesion performance
3Strength
If complex surface treatment techniques are used for bonding low-surface-energy plastics, then bond strength is achieved, but cost increases making it unsuitable for retail consumers
Solution Approach 1:
The invention replaces expensive, complex surface treatment equipment and processes with a cost-effective chemical additive approach. The cyclic imide-containing monomers are incorporated into the adhesive at relatively low concentrations (5-50 wt%), providing a disposable, easy-to-apply solution that achieves strong bonds to low-surface-energy substrates without requiring costly surface treatment infrastructure, making the process suitable for retail consumers and low-volume operations
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 composition achieves enhanced adhesion to low-surface-energy plastics and metals, including galvanized steel, without requiring surface treatment, offering improved bonding performance and simplifying the bonding process.
Implementation Method 1
The organoborane initiator may be represented by the following general formula: (Formula I) The free-radical polymerization of the cyclic imide-containing acrylate or the cyclic imide-containing methacrylate and the other monomers may be initiated by an organoborane initiator
Data Source
AI summary
The composition includes a blend of monomers containing at least one of a cyclic imide-containing acrylate or a cyclic imide-containing methacrylate and an organoborane complex. The composition may be packaged as a two-part composition, wherein a first part comprises the blend of monomers, and wherein a second part comprises the organoborane complex. Articles are bonded with the composition, which is at least partially cured. Methods of making a bonded article are also disclosed. Bonded articles can include at least one low-surface-energy plastic.