| abstract |
The present invention relates to an aqueous polyurethane-urea dispersion and a preparation process thereof, an adhesive containing the same, and an adhesion article obtained by adhering with said adhesive. The aqueous polyurethane-urea dispersion comprises a polyurethane-urea dispersed therein, said polyurethane-urea is obtained from a reaction of a system comprising the following components: a polyisocyanate mixture; a polyester polyol having a melting temperature of greater than 32°C, wherein the melting temperature is measured by using a DSC-7 from Perkin-Elmer at 20- 100°C according to DIN 65467, and taken from the first temperature-rising curve; an emulsifier; an optional monohydroxy polyether and an optional diamine; the polyisocyanate mixture contains hexamethylene diisocyanate and dicyclohexylmethane diisocyanate, the amount of hexamethylene diisocyanate is 0.01wt%-25wt%, the amount of dicyclohexylmethane diisocyanate is 0.01wt%-6wt%, based on the amount of the system as 100wt%. The adhesive containing the aqueous polyurethane-urea dispersion of the present invention has a low activation temperature and a good mechanical property. |