DYNACOLL Copolyesters for Reactive Hotmelts Gabriele Brenner, Bernhard SchleimerWhat is DYNACOLL 7000 ?•Evonik Degussa‘s product range of medium molecular weightadhesive 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 DiacidsAdditives &CatalystsChargingEsterificationCondensation Drumming Liquid bulk200 kgdrums30 kgpailsDYNACOLL 7000building block systemSeries7100amorphous Tg > 0°CSeries7200liquid Tg < 0°CSeries7300partially crystalline Tg < 0°CMixtures of DYNACOLLs are used to design RHM propertiesCharacterising of RHMViscosity (°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 viscosityBrookfield Thermosel00,511,522,5708090100110120130140150Temperature(°C)M e l t v i s c o s i t y (P a .s)Softening point(R&B)Test methodsOpentimeSetting time Setting timeT-BondShear adhesionwood metal plasticReactive 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 containersQuality control by checking NCO content and viscosity0,511,522,53110 °C130 °C150 °Creaction temperature(%)determinedtheoreticalNCO contentviscosity at 130°CDYNACOLL 7130/ 7250/ 7360 (1/1/1) and MDI (OH/ NCO 1/ 2.2)Reaction time 45 minutes200400600800110 °C 130 °C150 °Creaction temperatureL V T 4 (P a *s )Packaging and Processing of RHMTypical packaging•cartridges•pouch bags•pails•drumsMelting•drum melter•melting pot•heated cartridge gunInfluences of DYNACOLLon RHM propertiesSeries710072007300O pen tim e /Setting tim eG reen strengthViscosityFlexibility0246810100200300400time in hours (at 25°C, 65 % rel. humidity)b o n d s t r e n g t h (N /m m 2)wood/wood PVC/PVCwood/wood (0.05% DBTL)PVC/PVC (0.05% DBTL)DYNACOLL 7150, 7250, 7360 1/1/1MDI (OH/ NCO 1/2.2)Moisture Curing of RHM12345S h e a r a d h e s i o n(N /m m 2)Stainless steelGalvanized steelAluminiumRHM compositionDYNACOLL 7150 / 7210 / 7330 3 / 4 / 3MDI OH / NCO 1 / 2.2Adhesion properties on metalS h e a r a d h e s i o n(N /m m 2)ABS PBT PS PA 6PA 12PP PVC PCRHM compositionDYNACOLL 7230/7320/7380 3 / 3 / 1MDI OH/NCO 1 / 2.2Adhesion properties on plastic24681012S h e a r a d h e s i o n (N /m m 2)ALUWOODABSPCPMMAPVCPBTcontrol 10 % DYNAPOL S140220 % DYNAPOL S1402DYNAPOL S 1402 containing RHM Shear adhesionRHM for woodworking and flat lamination applicationsSandwich constructionsProfile wrappingParquet floorsEdge bandingRHM are used in various applicationsWindshield bondingbookbindingTextile laminationIf you have further questions, pleasecontact us!Gabriele BrennerPhone: +49 2365 49 4534Fax: +49 2365 49 4990gabriele.brenner@Bernhard SchleimerPhone: +49 2365 49 9580Fax: +49 2365 49 4990bernhard.schleimer@This information 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 verifyed 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.。