Preparation and Properties of High-strength One-component Polyurea Coatings
Based on the latent curing process,the effects of different primary binary amines and small molecular aldehydes,-NCO/aldehydes mole ratio and catalysts on the properties of one-component polyurea were investigated.The results showed that the m-xylene-α,α'-diamine of primary diamines,the isobutyraldehyde of small molecule aldehyde,and-NCO/aldehydes imide molar ratio of 2.2:1 were the optimum conditions without the addition of catalysts.The prepared one-component polyurea has high-strength mechanical properties with a tensile strength greater than 40 MPa and a fracture elongation greater than 400%,tear strength over 120 N/mm and storage stability of more than half a year.
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