1. What is polyurethane waterproof coating?
Polyurethane waterproof coatings are made of isocyanate (TDI-80. polyether polyol N220 and 330N) as the main raw materials, and are synthesized by prepolymerization method. Polyurethane elastomers are then added with fillers, plasticizers, catalysts and other additives. The basic principle of its film formation is the addition reaction of isocyanate (-NCO) with polyols, polyamines, water and the like containing active hydrogen (-NH2).
2. Advantages of polyurethane waterproof coatings
Polyurethane waterproof coatings have the advantages of good waterproof performance, high strength, good elasticity, water resistance, aging resistance, corrosion resistance, simple construction and easy repair. At the same time, due to its versatility and excellent physical properties, it can solve the problem of easy leakage of waterproof membranes, greatly improving the overall waterproof effect of buildings, thereby meeting various engineering requirements. It can be applied to waterproof projects such as roofs, basements, toilets, pools, tunnels, bridges, subways, culverts and other buildings. The excellent performance and significant advantages of polyurethane waterproof coatings ensure the waterproof quality of the project.
3. Disadvantages of polyurethane waterproof coatings
The main disadvantages of polyurethane waterproof coatings are high cost, strict construction process requirements, and high construction environment requirements. Isocyanates in polyurethane waterproof coatings will volatilize toxic gases, and corresponding protective measures need to be taken during construction to avoid harm to the human body. In addition, the curing time of polyurethane waterproof coatings is relatively long, and the temperature and humidity need to be controlled during the construction process to ensure the curing effect of the coating.
4. Environmentally friendly combination of polyurethane waterproof coatings
① Single-component water-based polyurethane waterproof coatings
Water-based polyurethane waterproof coatings use water as a dispersion medium, are non-toxic, non-flammable, and will not cause environmental pollution, while greatly reducing the impact on the environment and human health. Water-based polyurethane waterproof coatings have good waterproof and bonding properties, and are suitable for waterproofing projects of various buildings. Water-based polyurethane waterproof coatings have a short curing time, simple construction, easy repair, and good aging resistance. Water-based polyurethane waterproof coatings have excellent environmental performance, meet national environmental protection requirements, and are the future development direction of waterproof coatings.
②Single-component solvent-free polyurethane waterproof coating
Solvent-free polyurethane waterproof coating does not contain solvents, is non-toxic, non-flammable, and does not cause environmental pollution, while greatly reducing the impact on the environment and human health. Solvent-free polyurethane waterproof coating has good waterproof and bonding properties, and is suitable for waterproof projects of various buildings. Solvent-free polyurethane waterproof coating has a short curing time, simple construction, easy repair, and good aging resistance. Solvent-free polyurethane waterproof coating has excellent environmental performance, meets national environmental protection requirements, and is the future development direction of waterproof coatings.
With the continuous development of the construction industry, especially the increasingly high requirements of the construction industry for environmental protection, traditional waterproof coatings can no longer meet people's needs. Polyurethane waterproof coatings have gradually become the first choice of building waterproof materials with their excellent waterproof performance, good environmental performance and significant economic benefits. With the continuous advancement of science and technology, the performance of polyurethane waterproof coatings will be further improved, and the scope of application will be wider. In the future, polyurethane waterproof coatings will develop in a more environmentally friendly and efficient direction.
