Material Focus: Easmer Monomers and Oligomers for Stronger Adhesion
Release time:
2025-03-30
Adhesion refers to the bonding strength between a coating and its substrate, primarily determined by two mechanisms: mechanical interlocking (coating penetration into substrate micro-pores) and chemical bonding (intermolecular forces or covalent bonds). UV/EB (ultraviolet/electron beam) curing coatings are renowned for rapid curing (1-10 seconds) and high efficiency, but their adhesion performance often faces challenges due to unique chemistry and process dynamics. In this issue, we recommend Easmer monomers and oligomers that help achieve stronger adhesion.
1. UV/EB-Curable Monomers with Excellent Adhesion
Monomer Name | Key Features | Compatible Substrates | Typical Applications |
Acryloylmorpholine (Easmer ACMO) | Monofunctional, low viscosity (12 cps), low shrinkage, moderate surface tension (44.6 mN/m) | PP, ABS, metals | Plastic coatings, electronic adhesives |
Dicyclopentadiene Acrylate (Easmer DCPDA) | Cycloaliphatic structure, high Tg (>150°C), heat-resistant, low shrinkage (<3%) | PC, PMMA, glass | Automotive interior coatings, optical device encapsulation |
2-Phenoxyethyl Acrylate (Easmer PHEA) | High wettability, flexibility, anti-yellowing | PET, plated metals | Film printing, electronics housing |
Tetrahydrofurfuryl Acrylate (Easmer THFA) | Strong polarity, enhances chemical bonding with high-surface-energy substrates (metals, glass) | Metals, ceramics | Industrial anti-corrosion coatings, glass inks |
Selection Logic:
Plastic substrates: Prioritize low surface tension monomers (e.g., Easmer ACMO) to improve wettability.
High-temperature applications: Cycloaliphatic Easmer DCPDA minimizes adhesion failure caused by thermal stress.
2. Adhesion-Boosting UV/EB-Curable Oligomers
Oligomer Type | Representative Product | Key Advantages | Compatible Substrates |
Polyurethane Acrylate (PUA) | Easmer UA852 | Urethane bonds form hydrogen bonds with metals/wood, high flexibility | Metals, wood, leather |
Epoxy Acrylate (EA) | Easmer EA625 | Low viscosity, high pigment wettability, shrinkage <5% | PE, PP plastics |
Hyperbranched Polyester Acrylate | Under Development | Branched structure reduces viscosity and shrinkage, enhances glass adhesion | Glass, stainless steel |
Silicone-Modified Acrylate | Under Development | Siloxane segments improve surface migration, suitable for low-energy substrates (e.g., silicone) | Silicone rubber, TPU |
Formulation Guidelines:
Metal substrates: Combine PUA (Easmer UA852) with phosphate adhesion promoters (HEMAP) for chemical anchoring.
Flexible plastics: Blend EA (Easmer EA625) with flexible monomers (Easmer THFA) to balance hardness and peel resistance.
3. Supporting Additives and Process Optimization
Adhesion Promoters:
Phosphate esters (e.g., HEMAP): React with metal oxides, dosage 0.5-1.5%.
Silane coupling agents: Improve glass/ceramic bonding; requires pre-hydrolysis.
Curing Process:
Graded curing: Pre-cure (200 mJ/cm²) → Main cure (800 mJ/cm²) to reduce internal stress gradients.
Inert atmosphere curing: Nitrogen purge minimizes oxygen inhibition and enhances deep-layer crosslinking.
4. Industry Application Cases
Case 1: Automotive Metal Trim Coating
Formula: Easmer DCPDA + Easmer UA852 + HEMAP
Performance: Passed ASTM D3359 cross-cut test (5B rating), salt spray resistance >500 hours.
Case 2: PET Film Printing Ink
Formula: Easmer PHEA + Easmer EA625 + 1% KH-560
Performance: Peel strength increased to 4.5 N/cm (original formula: 2.1 N/cm).
Conclusion
Adhesion optimization requires a synergistic "substrate-interface-coating" design strategy:
Substrate pretreatment (plasma/flame treatment) to enhance surface energy.
Monomers/oligomer selection to match substrate polarity.
Additives and processes to strengthen chemical bonding and stress relief.
Note: Recommendations should be validated with specific formulations. Use contact angle testing, FTIR analysis, or other methods to pinpoint failure points.
adhesion,UV monomers,UV oligomers
Latest News
2025-12-22
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