SPRAYABLE POLYURETHANE BASED PROTECTIVE COATING Russian patent published in 2018 - IPC C08G18/10 C08G18/48 C08G18/62 C08G18/32 C08G18/72 C09D175/08 C08G18/24 

FIELD: chemistry; metallurgy.

SUBSTANCE: invention relates to a sprayable polyurethane based reaction system for forming a protective coating in industrial containers. Reaction system includes a first component and a second component, wherein a reaction product of the first component and the second component has a tensile strength of at least 1500 psi (10,34 MPa) and a percent elongation at break of at least 400. First component is a reaction product of a polyol component and an isocyanate component, wherein the polyol component includes a first butylene oxide-propylene oxide copolymer polyol having a polyoxybutylene content of at least 50 wt% based on a total weight of the first butylene oxide-propylene oxide copolymer polyol, and the isocyanate component includes at least one polyisocyanate, and a viscosity of the first component being less than 1500 cP at 25 °C. Second component includes a second butylene oxide-propylene oxide copolymer polyol having a polyoxybutylene content of at least 50 wt%, based on a total weight of the second butylene oxide-propylene oxide copolymer polyol, wherein a viscosity of the second component is less than 1,500 cP at 25 °C. Wherein a difference between the viscosities of the first component and the second component within a temperature range of 60 °C and 80 °C is from -150 cP to 150 cP, and at least one component selected from a group of the polyol component and the second component includes a primary hydroxyl containing polyol. Protective coating formed from the reaction system is also provided.

EFFECT: obtaining a sprayable formulation exhibiting high reactivity when sprayed onto a surface of a large industrial container to form a protective coating having tensile strength of at least 1,500 psi (10,34 MPa) and percent elongation at break of at least 400 and imparting chemical resistance, for example, acid resistance, to the industrial container.

10 cl, 5 tbl, 2 ex