Title: SPRAYABLE POLYURETHANE BASED PROTECTIVE COATING

 Number/Link:  WO2015/050811

Applicant/Assignee: Dow

Publication date: 9-04-2015

“Gist”: Use of butylene oxide polyols in sprayable coating composition

Why it is interesting: The hydraulic fracturing fluids used in ‘fracking’ operations are stored and transported in so-called ‘frac tanks’. Because fracking fluids can contain highly corrosive compounds such as HCl and solvents such as toluene and xylene, the tanks need a protective coating with a high chemical resistance. According to this application such a coating can be accomplished using a sprayable 2 component system comprising polyols with a high butylene oxide (BO) content, e.g. polyols prepared from 80% butylene oxide and 20% propylene oxide (PO) with a molecular weight of about 2000 and a functionality of 2. In the first component the BO/PO polyol is prepolymerized with an isocyanate e.g. MDI, while used as such in the second component. The two components are prepared such that they both show a similar viscosity of less than 1500 cP at 25°C, so that the coating composition is sprayable.

Frac tank.