Preparation and Performance Study on New Type of Two-component Brushing Polyurea Waterproofing Coating
A new type of high solid content two-component brushing polyurea waterproofing coating is prepared using liquid secondary amine chain extender WANALINK® 6200 and aromatic isocyanate prepolymer as the main raw materials.The obtained coating possesses the performance of tensile strength at 23.66 MPa,elongation at break at 498％,tear strength at 66.5 N/mm,bonding strength at 3.16 MPa,hardness at 89A,and has good wear resistance and waterproofing property.It can meet the performance requirements for Type Ⅱ two-component brushing polyurea in standard DL/T 5317-2014"Technical code for construction of polyurea coating in hydropower and water resources engineering".Based on the liquid chain extender WANALINK® 6200,fire-resistant and solvent-free two-component polyurea waterproofing coatings can also be developed.
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