Preparation and Research of Polyurea Coatings for Trenchless Pipeline Repair
A kind of polyurea coatings for trenchless pipelines repair has been developed.The effects of different amine resin systems,different isocyanate resin systems and dehydrating agents on the coatings were studied.The repair compatibility of the polyurea coatings for pipes with different diameters and spraying repair stability of long distance were surveyed.The results showed the best performance of the coatings can be obtained when the mass ratio of NH-221,NH-136 and E100 is 4∶4∶1,the mass ratio of Desmodur N3600 and Coronate HK is 1∶1,and the dehydrating agent is silicate-based molecular sieve in powder form with addition of 4%.The polyurea coatings for trenchless pipelines repair possesses compatibility for pipes with diameters of 150 mm,200 mm,300 mm and spraying repair stability of long distance.
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