Two-component spray polyurea is the abbreviation of two-component spray polyurea (or spray pure polyurea) technology. It is not a concept of polyurea material, but a technical definition or process definition and description. Polyurea materials are defined as "high molecular weight materials containing repeated urea-based segments -NHCONH-". One-component polyurea coating, referred to as one-component polyurea, is a kind of polyurea material. Other single-component polyurea materials-such as polynonyl urea, polyurea lubricating oil, polyurea biomaterials, etc. , has been commercialized; In medical journal articles, there are many names of polyurea materials, which are beyond the definition of spray polyurea. Because the reference objects are different, one refers to technology and the other refers to materials. Up to now, 100% of polyurea materials are only polynonylurea-one-component solid polyurea materials. There are also mixed materials-including film-forming materials that are finally cured by spraying polyurea technology.