MB31 · Hardener
Product No. 101 P 203 · Epoxy resin hardener with cyclic amidine structure.
1. Product Information
2. Description
Hardener MB31 is an epoxy resin hardener having the chemical structure of a cyclic amidine. The product is supplied in the form of yellowish flakes.
3. Technical Data
| Property | Value | Unit | Test Method |
|---|---|---|---|
| Nitrogen content | 18.9 – 19.4 | % by wt | Dumas |
| Solidification Point | 90 – 110 | ℃ | ASTM D1015 |
| Appearance | Crystal or Powder in light yellow | ||
| Purity | ≥ 99% | ||
4. Application
- Hardener for highly reactive epoxy resin powder coatings.
- Accelerator for dicyandiamide and epoxy polyester powder coatings.
- Hardener for modifying surface gloss.
Typical Formulations
The following gives the formulations of MB31 for epoxy coatings (parts by weight):
| Component | Formulation I | Formulation II |
|---|---|---|
| Hardener MB31 | 5.8 | 6.7 |
| Epoxy Resin A | 94.2 | — |
| Epoxy Resin B | — | 93.3 |
To obtain desired reactivity, part of the dicyandiamide may be replaced by Hardener MB31.
Mixed polymer powder systems are markedly accelerated with quantities of 0.2 – 1.0% by wt Hardener MB31 (referred to binder). Gloss levels of pure epoxy powder coatings can be varied by partially replacing "Matt Hardener" MB55 or "Matt Hardener" MB68 by "gloss hardener" MB31.
5. Application of Powder Coatings Containing Hardener MB31
The high reactivity of these powders gives rise to low curing temperatures (from 140℃) at relatively short curing times which are of particular interest for use in area of temperature sensitive materials (pigments in the powder; substrates with soldered parts).
The advantage of the highly reactive Hardener MB31 powder coating shows itself in the shortness of the curing times (< 30 sec) or the high curing temperatures (max. 240℃), e.g. in the coating of pipes, fittings, glass and ceramic articles.
This epoxy powder system is characterized by optimal (powder) coating technology related properties and very good adhesion on the most diverse substrates.
6. Storage and Packaging
The product is delivered in flat PE-bags, net weight 20kg or 25kg. If kept cool (0-40℃) and dry in closed bags the product can be stored for at least 1 year in accordance to the specification. All opened bags should be carefully resealed immediately after use.
7. Disclaimer
This information and all further technical advice is based on our present knowledge and experience. However, it implies no liability or other legal responsibility on our part, including with regard to existing third-part intellectual property rights, especially patent rights. In particular, no warranty, whether express or implied, or guarantee of product properties in the legal sense is intended or implied. We reserve the right to make any changes according to technological progress or further developments.
The customer is not released from the obligation to conduct careful inspection and testing of incoming goods. Performance of the product described herein should be verified by testing, which should be carried out only by qualified experts in the sole responsibility of a customer. Reference to trade names used by other companies is neither a recommendation, nor does it imply that similar products could not be used.