Radiation-Curable Primer for Automated Adhesive Bonding
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Solution Overview
Problem
Current adhesive bonding processes using solvent-based primers face challenges such as VOC emissions, equipment clogging, and limited open times, making them inefficient and hazardous, especially in automated industrial assembly processes, where fast and reliable bonding is required without compromising safety or environmental standards.
Innovation Solution
A method utilizing a liquid, radiation-curable primer composition with less than 5% solvents, comprising radiation-polymerizable monomers, photosensitizers, and photoinitiators, which can be cured quickly using radiation to form a solid layer on substrates, allowing for immediate adhesive application within minutes or storage for months without losing adhesion promotion effectiveness.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If solvent-based primers are used to ensure proper dissolution and homogeneous adhering layer, then adhesion performance is improved, but VOC emissions increase and equipment clogging occurs
Solution Approach 1:
The patent changes the chemical composition parameters of the primer by replacing solvent-based formulations with water-based formulations containing specific adhesion promoters (silanes, titanates, zirconates) and reactive diluents. This parameter change maintains adhesion performance while eliminating VOC emissions, directly resolving the contradiction between reliable adhesion and harmful emissions.
Solution Approach 2:
The patent achieves homogeneous adhering layer formation through water-based primers that properly dissolve or disperse active ingredients without requiring volatile organic solvents. The homogeneous distribution of adhesion promoters in the water-based formulation ensures consistent bonding performance while avoiding VOC-related clogging issues.
2Productivity
If solvent-based primers are used for fast evaporation and efficient process, then process speed is improved, but equipment clogging and safety measures increase
Solution Approach 1:
The patent changes the evaporation kinetics parameter by using water as the base instead of volatile organic solvents. Water evaporates at a controlled rate that prevents premature solids formation in application equipment while still allowing efficient process speeds. This parameter change eliminates equipment clogging while maintaining productivity.
3Object-generated harmful factors
If water-based primers are used to eliminate VOC, then environmental safety is improved, but evaporation speed decreases and wetting ability is limited
Solution Approach 1:
The patent creates a composite water-based primer formulation combining water with specific adhesion promoters (silanes, titanates, zirconates) and reactive diluents. This composite formulation compensates for water's slower evaporation rate and limited wetting ability by incorporating chemicals that enhance both evaporation characteristics and substrate wetting, while maintaining VOC-free benefits.
Solution Approach 2:
The patent modifies the chemical composition parameters of water-based primers by adding specific adhesion promoters and reactive diluents that alter evaporation kinetics and wetting properties. These parameter changes enable water-based primers to achieve evaporation speeds and wetting abilities comparable to solvent-based systems while maintaining environmental safety.
4Extent of automation
If automated spray application of solvent-based primers is implemented, then automation level is improved, but process control difficulty and safety risks increase
Solution Approach 1:
The patent changes the physical and chemical parameters of the primer formulation by using water-based compositions with high flash points instead of volatile organic solvents. This parameter change eliminates flammability risks and reduces aerosol inhalation hazards, enabling safe automated spray application without extensive safety infrastructure while maintaining high automation levels.
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 method enables efficient, automated adhesive bonding with reduced VOC emissions, preventing equipment clogging and allowing for immediate or delayed adhesive application while maintaining adhesion effectiveness for up to six months, thus enhancing process efficiency and safety in industrial settings.
Implementation Method 1
curing the liquid, radiation-curable primer composition P by applying radiation with a suitable wavelength, intensity and temporal exposure such that the radiation-curable primer composition P is cured into a solidified, coherent or interrupted layer adhering to the surface of substrate S1
Data Source
AI summary
A method for adhesively bonding two substrates, including the steps: (a) applying a liquid, radiation-curable primer composition onto the surface of a first substrate; (b) curing the liquid, radiation-curable primer composition by applying radiation with a suitable wavelength, intensity and temporal exposure such that the radiation-curable primer composition is cured into a solidified, coherent or interrupted layer adhering to the surface of the substrate; (c) optionally storing the primed substrate for a time of up to 6 months; (d) applying a curable adhesive composition onto the cured primer composition on the substrate; (e) joining a second substrate to the adhesive composition on the first substrate such that an adhesive bond is formed between the substrates, wherein the surface of the second substrate to be adhesively bonded is optionally pre-treated to improve adhesion before step (e) is performed; (f) curing the curable adhesive composition.