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|1. (WO2018120055) POLYURETHANE OR POLYURETHANE-UREA AQUEOUS DISPERSION, PREPARATION METHOD THEREFOR, AND USE THEREOF|
|Applicants:||WANHUA CHEMICAL GROUP CO., LTD.
WANHUA CHEMICAL (GUANGDONG) CO., LTD.
|Title:||POLYURETHANE OR POLYURETHANE-UREA AQUEOUS DISPERSION, PREPARATION METHOD THEREFOR, AND USE THEREOF|
A self-crosslinkable polyurethane or polyurethane-urea aqueous dispersion, a preparation method therefor, and a use thereof. Side chains of the polyurethane or polyurethane-urea contain a non-sterically-hindered siloxane group. During the drying and activation of the aqueous dispersion, the siloxanes in the side chains are hydrolyzed and crosslinked with each other to increase a cross-linking density, significantly improving the heat resistance, the humidity resistance, and other properties of an adhesive obtained therefrom. The water dispersion itself has a good stability. In addition, an application system based thereon has an excellent stability and a long storage time. The aqueous dispersion is suitable for the preparation of high quality paints and sealants, especially adhesives.