物理闭孔发泡剂在底涂、密封和胶粘中的使用.pdf

EXPANCEL MICROSPHERES IN UNDERBODY COATINGS SEALANTS AND ADHESIVES Blowing agent in underbody coatings During gelation of the underbody coating the EXPANCEL DU microspheres will ex pand to a very low density and create a foamed product with reduced weight SEM photo of cross section of expanded underbody coating with EXPANCEL DU The intact expanded microspheres give good flexibility and resilience to the prod uct which improves the stone chip resis tance and the sound insulation At an addition of 1 EXPANCEL 009 DU 80 the plastisol density drops from 1 30 g cm to 0 80 g cm The weight reduction is about 40 Without EXPANCEL 1 EXPANCEL 009 DU 80 SEM photo of cross section of expanded sealant with EXPANCEL DU Blowing agent in expandable sealants When EXPANCEL DU is added to an ex pandable sealant the microspheres make the sealant expand during the heat treat ment The expansion causes a density re duction This type of sealant can be used in hollow spaces to reduce vibrations and im prove the sound insulation The good adhe sion created by the expanded micro spheres will also prevent transportation of moisture Oven 150 C 2 EXPANCEL 091 DU 80 Without EXPANCEL Head Office Head Office Expancel Box 13000 SE 850 13 Sundsvall SWEDEN Phone 46 60 13 40 00 Fax 46 60 56 95 18 US Office US Office Expancel Inc 2240 Northmont Pkwy Duluth GA 30096 USA Phone 1 770 813 9126 Fax 1 770 813 8639 E mail info Internet www E EXP UBC001 ENEXP UBC001 EN 2007 06 28 EXPANCEL is a registered trademark of Akzo Nobel in a number of territories in the world Process aid in lamination and moulding EXPANCEL DU can be used in adhesives as a process aid in lamination and mould ing The internal pressure produced by the microspheres facilitates the wetting of the surfaces resulting in improved adhesion be tween laminated materials Oven 130 200 C In mouldings including fillers e g coarse mineral fillers or waste rubber the adhe sion between the filler particles is improved by the internal pressure from the micro spheres The mould is completely filled and the shrinkage of the material is eliminated In the above illustration waste rubber 0 4 0 8 mm is moulded with 4 6 EXPANCEL 551 DU 40 in a blocked adhe sive polyurethane system cured at 150 C SEM phot