What is polyurethane asphalt coating?

I found it. Let's see if I can help you. Polyurethane epoxy coal tar pitch anticorrosive coating relates to coatings for external anticorrosive coatings of gas, coal gas, water supply and drainage buried and overhead steel pipelines, in particular to a moisture-cured polyurethane epoxy coal tar pitch anticorrosive coating, which is uniformly coated outside the steel pipeline and is formed by mixing two components A and B according to the weight of 1: 1. The preparation process of the two components A and B is as follows. Component A consists of polymethylene polyphenyl isohydrogen ester, polyether 3030 or 330, polyether 635 or 450, dioctyl ester or dibutyl ester, epoxy resin, mica powder, quartz powder and phosphoric acid; Component B consists of medium temperature coal tar pitch, 4# or 5# petroleum pitch, cyclohexanone, toluene, solvent S 1000# or industrial xylene, mica powder and quartz powder. The coat process of that invention is simple, the application performance is good, and the use cost is low.