Product Information
Latent Accelerator for Epoxy Resins
Dyhard® URAcc
Dyhard URAcc products represent latent micronized urone-type accelerators based on substituted urea. They are useful as latent accelerators preferably in combination with latent hardeners, e.g. Dyhard 100 series, for hot curing epoxy resin formulations. White silica (SiO2) serves as anti caking agent for reducing agglomeration tendency and improving free flowing properties. Especially Dyhard URAcc 43 is designed for epoxy formulations containing micronized dicyandiamide.
Ingredients Commercial Products
ADHESIVES
Substituted Urea (Urone) Dyhard URAcc 13 Dyhard URAcc 43
Application
COMPOSITES
POWDER COATINGS
PRINTED CIRCUIT BOARDS
ID No. P-UAx3/01e
Dyhard URAcc products find application as highly latent accelerators in hot curing epoxy formulations. Their use is particularly suited in combination with micronized dicyandiamide, e.g. Dyhard 100S, or with dicyandiamide pastes Dyhard D50EP and DF50EP. Dyhard URAcc products offer comparable reactivity to the so called “industry standard” Dyhard UR200 (diurone). However, unlike diurone, these accelerators contain no halogen atoms or moieties and therefore may be preferred for applications where halogen-free formulations are required. The fact that they are not considered as dangerous chemical compounds shall make them extremely advantageous in terms of product handling, processability and with respect to environmental issues. In formulations based on liquid bisphenol-A epoxy resins (EEW 182-192) Dyhard URAcc products are typically added in amounts of 0,5-5,0 parts per 100 parts of epoxy resin. The optimal ratio strongly depends on the specific application and process requirements and has to be determined individually for each case. Their extraordinary latency makes Dyhard® URACC ideal for storage-stable one package formulations. Depending on fillers, modifiers and storage temperature shelf lives up to 12 months may be obtained. Unlike many other accelerators they show superior latency performance even in warm formulations.
Product Information
Latent Accelerator for Epoxy Resins Formulation Examples Dyhard UR200 Dyhard URAcc 43 Dyhard URAcc 13 Dyhard 100S Liquid bisphenol A epoxy resin (EEW 182 - 187) DSC – Onset [°C] DSC – Peak [°C] DSC – Tg [°C] Gel time at 140 °C Reaction time at 140 °C Latency at 60 °C (increase of viscosity in [%] after 6 and 24 hours stored at 60°C)
A 1,00 phr --6,5 phr
Dyhard® URAcc B -1,75 phr -5,6 phr
C --0,85 phr 6,5 phr
D 3,00 phr --6,5 phr
E -3,00 phr -5,0 phr
F --1,40 phr 6,5 phr
100 parts 100 parts 100 parts 100 parts 100 parts 100 parts 151,8 160,3 132 06’01’’ 9,3 min
150,1 160,0 136 05’45’’ 9,3 min
150,1 160,3 132 05’36’’ 9,3 min
148,0 154,4 126 04’25’’ 8,0 min
145,1 156,7 131 04’26‘’ 8,1 min
145,5 155,8 130 04’19’’ 8,1 min
6h 2,2% 24h 450%
6h 6,7% 24h 160%
6h 5,1% 24h 200%
6h 7,4 24h solid
6h 5,5% 24h 2000%
6h 6,1% 24h 1000%
Handling The acute oral toxicity levels are low (LD50 oral, rat > 2000 mg/kg). No hazard label is required. Nevertheless the usual precautions for handling chemicals must be observed. In particular the general threshold level for dust and a sufficient skin and eye protection must be observed. Please consult the Material Safety Datasheet for additional information.
Packaging Cardboard box with PE-inliner containing 13 kg net URAcc 13 (520 kg per pallet); Cardboard box with PE-inliner containing 15 kg net URAcc 43 (600 kg per pallet).
Storage Unlimited storability in a dry place at ambient temperature without chemical decomposition. Long storage may result in caking. Storage time from date of delivery is recommended not to exceed 12 months. Please consult the Material Safety Datasheet for additional information.
Contact Joerg Brinkmann Dr. Martin Hitzler Dr. Christian Klinger Commercial Manager Applied Technology Applied Technology Phone: +49-8621 / 86-2935 +49-8621 / 86-3352 +49-8621 / 86-2511 Fax: +49-8621 / 86-502935 +49-8621 / 86-503352 +49-8621 / 86-502511 E-mail:
[email protected] [email protected] [email protected]
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 party 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. Status May 2007 * Edition May 2007/ BK-TB-SP * Provided that a new edition is published this data sheet loses its validity.
AlzChem GmbH • P.O. Box 1262 • D-83303 Trostberg
