Stick to it! Adhesion promotion on polar surfaces.
BENEFITS AT A GLANCE:
Functional co-monomer for adhesives, e.g. 2K methacrylate-based structural adhesive
Improves adhesion dramatically even at low concentrations
VISIOMER® HEMA-P: AN OVERVIEW
2-Hydroxyethyl-Methacrylate-Phosphate (HEMA-P) is a well-known adhesion promoter in applications like adhesives and coating resins. Evonik Operations GmbH offers VISIOMER® HEMA-P 70 M and VISIOMER® HEMA-P 100. A comparison of the two products can be found in Table 1.
Figure 1: Structure of the active ingredient in VISIOMER® HEMA-P.
| VISIOMER® HEMA-P 70M | VISIOMER® HEMA-P 100 | |
|---|---|---|
| Supply | in 30% MMA | pure |
| Viscosity | 40-75 mPa*s | 3000 — 7000 mPa*s |
| P-content | 10.6% | 15% |
| Application Areas |
- Emulsion Polymerization - Bulk Polymerization - Reactive Resins |
- All application areas where MMA is critical due to VOC, odor, flammability or performance |
Table 1: Comparison of VISIOMER® HEMA-P 70M and VISIOMER® HEMA-P 100.
ADHESION PROMOTION
VISIOMER® HEMA-P products can be used as functional co-monomers for adhesives and coatings. They enable superior adhesion to polar surfaces like minerals, glass, and metals.Figure 2 shows that even small concentrations of VISIOMER® HEMA-P increase the shear strength of a standard 2K methacrylate-based structural adhesive on steel substrates substantially. It easily triples the shear strength at an addition of 5wt% of VISIOMER® HEMA-P 100.
Figure 2: Performance of adhesion promoter VISIOMER® HEMA-P 100 in a standard structural adhesive formulation.
In a nutshell, VISIOMER® HEMA-P is a specialty methacrylate, which improves adhesion dramatically even at low concentrations. It merges high polarity with adequate flexibility, making it an added value for new resin and adhesive formulations.