Polyurethane coating waterproof is a liquid applied material that can be used to seal and protect surfaces. It is durable, flexible and easy to clean and can withstand abrasion, corrosion and weathering. It can also be applied to concrete surfaces, walls and roofs. It is resistant to many chemicals, mildew and aging, which make it suitable for use in areas that are often submerged in water or experience high humidity.
In addition, PU waterproof paint has good adhesion, elasticity and crack bridging performance. It has a low VOC and can be applied with a brush, roller or airless sprayer. It is also highly resistant to diluted acids, bases, salts and chemical substances. It also has good thermal and acoustic insulation, low porosity and excellent tensile and tear strength.
Despite these advantages, there are a number of concerns about the sustainability of PU waterproofing coatings. The synthesis of isocyanate and polyether polyol involves the production of volatile organic compounds, including dioxins and other polycyclic aromatic hydrocarbons. This is a significant concern because it can cause environmental damage and harm to humans. To address these concerns, researchers are working to improve the sustainability of PU waterproofing coatings.
This patent application relates to a double-component high-strength polyurethane waterproof paint for railways. Component A is an isocyanate end-capping prepolymer obtained by polycondensation of polyether polyol and isocyanate in the presence of tartaric acid. The component B is a liquid composed of polyether polyol, plasticizer, reinforcing agent and coagulant. The two components are uniformly mixed according to a certain ratio and coated on the base layer to form a high-strength, elongation-at-break and high-bonding polyurethane waterproof coating.
