Product details
IDENTIFICATION:
Chemical name: 3-(3,4- Dichlorophenyl)- 1,1- dimethylurea / Diuron
Synonym: 1-(3,4-dichlorophenyl)-3,3-dimethylurea ; Diuron ; Dyhard UR200
CAS Number: 330-54-1
Structural formula:
A latent accelerator UR200 based on substituted urea for thermosetting epoxy curing systems, well combined with Dicyandiamide hardeners
SPECIFICATION:
Appearance |
white powder |
Assay |
Min. 98.0% |
Melting point |
Min . 155℃ |
Particle size 98.0% |
Max. 10 μm |
Volatiles |
Max. 1.0% |
APPLICATION
UR200 Diuron can well activate the dicyandiamide curing in most kinds of single component thermosetting epoxy formulations :
★ Prepregs of epoxy composites e.g. for aerospace and sports equipments industry
★ Encapsulation materials for electronic industry e.g. CCL ,
★ Structural adhesives e.g. conductive resin
★ Powder coatings for car, marine ,airplane
★ Reinforcements e.g. fiberglass, carbon fiber
ADVANTAGES
Excellent balance between acceleration and latency
Compared with using dicyandiamide alone , the combination with UR200 can significantly reduce the curing temperature to 120-140℃
Moreover, with the urea group ,UR200 acts by providing isocyanate and active dimethyl-amine(DMA), the former reacts with epoxy to produce structural cross-link ,the latter finally becomes tertiary amine which catalyze curing of epoxy. Due to steric hindrance,UR200 makes the compounds a shelf life up to 3 months
FORMULATION CASES
Formulation |
1 |
2 |
3 |
UR200 |
1.0 phr |
3.0 phr |
5.0phr |
Dicyandiamide Micronized |
6.5 phr |
6.5 phr |
6.5 phr |
Liquid bisphenol-A-epoxy resin (EEW 182 -192) |
100 phr |
100 phr |
100 phr |
DSC –Onset [°C] |
152 |
148 |
145 |
DSC –Tg [°C] |
153 |
136 |
128 |
Gel time 140°C [min] |
6 |
5 |
4 |
Shelf life (double viscosity) at 23°C [days] |
130 |
100 |
90 |
Result values may be varied based on different used resin matrix.
Fillers and other additives to formulation can also change properties.
Packing and storage:
--10 or 15kg per Box,carton,kraft bags, FIBC or customized
--Keep sealed in original package ,under a cool and dry condition ,avoid humidity. recommended storage period no exceeds 24 months.
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