DYNACOLL 热熔胶介绍
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DYNACOLL Copolyesters for Reactive Hotmelts Gabriele Brenner, Bernhard Schleimer
What is DYNACOLL 7000 ?
•Evonik Degussa‘s product range of medium molecular weight
adhesive copolyesters
•Molecular weight(Mn) range2000 -8000
•saturated, linear, solvent free
•hydroxyl terminated
•OH value range13 -55, mainly30
•tailor-made raw materials for moisture curing reactive hot melts
(RHM)
DYNACOLL polyester preparation Water, Diols Water Diols Diacids
Additives &
Catalysts
Charging
Esterification
Condensation Drumming Liquid bulk
200 kg
drums
30 kg
pails
DYNACOLL 7000
building block system
Series7100amorphous Tg > 0°C
Series7200liquid Tg < 0°C
Series7300partially crystalline Tg < 0°C
Mixtures of DYNACOLLs are used to design RHM properties
Characterising of RHM
Viscosity (°C)
Open time (sec)
Setting time / wooden cubes method (sec)
Setting time / T-bond method (sec)
Tensile strength, elongation at break (N/mm2/ %)
Shear adhesion (N/mm2)
Melting point DSC (°C)
Softenig point (°C)
Melt viscosity
Brookfield Thermosel
00,511,522,5708090100110120130140150Temperature(°C)M e l t v i s c o s i t y (P a .s
)
Softening point(R&B)
Test methods
Open
time
Setting time Setting time
T-Bond
Shear adhesion
wood metal plastic
Reactive Hotmelt preparation
•Melting of DYNACOLL in heating boxes
•Charging of molten polyesters
•Drying of the molten polyesters evaporation of humidity at < 10 mbar and 130°C to avoide side reactions
•Reaction with excess diisocyanate(mainly MDI) under protective gas typical temperatures are120-130 °C
•Degassing until the melt is bubble-free
•Filling into sealed containers
Quality control by checking NCO content and viscosity
0,511,522,53110 °C
130 °C
150 °C
reaction temperature
(%)
determined
theoretical
NCO content
viscosity at 130°C
DYNACOLL 7130/ 7250/ 7360 (1/1/1) and MDI (OH/ NCO 1/ 2.2)Reaction time 45 minutes
200400600800
110 °C 130 °C
150 °C
reaction temperature
L V T 4 (P a *s )
Packaging and Processing of RHM
Typical packaging
•cartridges
•pouch bags
•pails
•drums
Melting
•drum melter
•melting pot
•heated cartridge gun
Influences of DYNACOLL
on RHM properties
Series710072007300
O pen tim e /
Setting tim e
G reen strength
Viscosity
Flexibility