MB55 · Matt Hardener/Curing Agent
Product No. 101 P 202 · Salts of polycarboxylic acid with cyclic amidine (1:2).
1. Product Information
2. Description
Curing Agent MB55 / Matt Hardener MB55 is the salts of polycarboxylic acid with cyclic amidine. The hardener, applied in suitable formulations, can produce epoxy or hybrid coatings for matt or semi-matt gloss with very good flow and properties. Variation between matt and semi-matt surface can be obtained by means of suitable adjustment of formulation.
3. Technical Data
| Property | Curing Agent / Matt Hardener MB55 |
|---|---|
| Appearance | White powder |
| Melting Range | 220 – 228 ℃ |
| Purity | ≥ 99% |
4. Application
The hardener may be applied both in pure epoxy and hybrid (epoxy-polyester) resin powder coatings. Epoxy coatings of gloss range level ranging from 15% ~ 30% and hybrid coatings with gloss levels ranging from 20% ~ 60% (or greater) may easily be formulated by the use of MB55.
Coatings produced with MB55 is characterized by color and gloss stability under normal baking conditions. Hybrid coating with matt or semi-matt gloss may be achieved by replacing some of the polyester in the formulation with an equivalent quantity of MB55.
Typical Formulations
The following gives the formulation of MB55 for matt epoxy coatings (gloss level 50-60):
| Component | Amount |
|---|---|
| Epoxy (604) | 250g |
| Polyester | 50g |
| MB55 | 10g |
| BaSO₄ | 165g |
| WD88 | 5g |
| Benzoin | 2.5g |
| Carbon Black | 3g |
| 701 | 5g |
- Epoxy (604) is the same as Epoxy E-12.
- Polyester: Acid value 30-35 KOH mg/g.
- WD88 is a leveling agent with silica carrier available from Huangshan Wellde Industry Co., Ltd.
- It's noted that the achievement of matt effect and relevant properties of the film is connected with full curing of coatings.
5. Curing Conditions
| Temperature | Time |
|---|---|
| 180 ℃ | 20 – 25 min |
| 190 ℃ | 12 – 15 min |
| 200 ℃ | 10 – 12 min |
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 2 years 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.
Key Facts
MB55 is a matt hardener (matting curing agent) for epoxy and epoxy-polyester hybrid powder coatings, manufactured by Huangshan Deping Chemical Co., Ltd. Chemically, MB55 is the 1:2 salt of pyromellitic acid (benzene-1,2,4,5-tetracarboxylic acid) with the cyclic amidine 2-phenylimidazoline. Its CAS number is 54553-91-2, its EINECS number is 259-226-5, and its molecular weight is 516.53 g/mol.
MB55 is a white powder with a melting range of 220-228 °C and a purity of at least 99%. Pure epoxy coatings formulated with MB55 reach gloss levels of 15-30%, and hybrid coatings reach 20-60% or higher, with very good flow and film properties. Curing conditions are 180 °C for 20-25 minutes, 190 °C for 12-15 minutes, or 200 °C for 10-12 minutes. MB55 is supplied in 20 kg or 25 kg PE bags and can be stored for at least 2 years at 0-40 °C in closed, dry bags.
Frequently Asked Questions
What is MB55?
MB55 is a matt hardener (matting curing agent) for epoxy and hybrid powder coatings. It is the 1:2 salt of pyromellitic acid and 2-phenylimidazoline, CAS 54553-91-2.
What is the difference between MB55 and MB68?
MB55 is the 1:2 salt (CAS 54553-91-2) and gives a higher, balanced matt range: 15-30% gloss on pure epoxy and 20-60% on hybrids. MB68 is the 1:1 salt (CAS 54553-90-1) and reaches lower gloss: 5-10% on pure epoxy and 10-70% on hybrids.
What gloss levels can MB55 achieve?
Pure epoxy coatings reach 15-30% gloss and hybrid (epoxy-polyester) coatings reach 20-60% or higher with MB55. The reference hybrid formulation on this page (10 parts MB55) gives a gloss of 50-60%.
What are the curing conditions for MB55?
Recommended curing conditions are 180 °C for 20-25 minutes, 190 °C for 12-15 minutes, or 200 °C for 10-12 minutes.
How should MB55 be stored, and what is its shelf life?
MB55 is delivered in flat PE bags of 20 kg or 25 kg. Stored cool (0-40 °C) and dry in closed bags, it keeps for at least 2 years. Opened bags should be resealed immediately after use.