Why is polyurea sprayed?

Thread Content

Polyurea types are classified into: concrete-based dust-proof polyurea, metal-based dust-proof polyurea, waterproof polyurea, and high-temperature resistant chimney polyurea. The two-component spray polyurethane-polyurea elastomer mixture reacts extremely rapidly, curing within 20 seconds and achieving walkable strength within 10 minutes, making it suitable for vertical surface applications. It can be used for a wide range of applications such as waterproofing, corrosion protection, and enhancing floor wear resistance. Storage method: Unused raw materials should be stored in tightly sealed containers to prevent moisture from entering and affecting their quality. The ideal storage temperature for the raw material is 25±5°C, with a storage period of 6 months. Crystallization of B may occur when the material temperature is below 15°C. If crystallization occurs in B, it should be dried immediately (the drying temperature must not exceed 80°C); after drying, it should be stored under normal conditions. If no action is taken promptly. Spray polyurea elastomer (SPUA) technology is a new type of solvent-free, pollution-free green construction technique developed in the United States over the past decade to meet environmental protection requirements, following other low (or zero) pollution coating technologies such as high-solid-content coatings, water-based coatings, radiation-cured coatings, and powder coatings. This process belongs to a fast-reacting spraying system; the raw material mixture contains no solvents, and the curing time is rapid. It enables the application of coatings 10 millimeters thick on vertical surfaces and curved surfaces without any sagging. SPUA technology completely overcomes the limitations of traditional environmentally friendly coating technologies. Once this technology entered China, it developed at a rapid pace. A large number of key projects are being implemented with great enthusiasm, including the artificial lake at China’s **Grand Theatre, the polyurea waterproofing and wear-resistant coatings for the seating areas of the Beijing Olympic Stadium, various polyurea-based projects for the stadiums used in the National Games in Shandong, polyurea waterproofing for the Beijing-Tianjin high-speed rail line, polyurea waterproofing for the Beijing-Shanghai high-speed rail line, and anti-corrosion treatments for metal tanks at Huaneng Power Plants. Advantages and features: 1. High reactivity and fast curing speed; it can be sprayed continuously on vertical surfaces, top surfaces, and any curved surfaces without sagging. Polyurea elastomer does not require a catalyst – it gels within 5–10 seconds and reaches walkable strength in 30 minutes. There is no limit to the thickness that can be applied in one application, resulting in a short construction period and high efficiency. 2. 100% solid content, no volatilization of organic substances, non-toxic – it is a pollution-free green spraying technology. 3. It has good stability at low and high temperatures. Polyurea elastomer coatings can be used over extended periods at temperatures ranging from –45 °C to 120 °C, and they can withstand short-term thermal shocks up to 160 °C. 4. Elastomeric and rigid coatings possess excellent physical properties. Such as tensile strength, tear strength, impact strength, resistance to cathodic disbonding, insulation strength, elongation, wear resistance, etc. Excellent low-temperature toughness. By adjusting the formula, the hardness can vary from soft rubber (Shore A30) to hard elastomers (Shore D75). 5. Excellent decorative, anti-corrosion, waterproof, and anti-slip properties. It can withstand long-term immersion in most corrosive media such as acids (of moderate strength or lower), alkalis, salts, and seawater, making it an excellent material for heavy corrosion protection. 6. Spraying is carried out using complete sets of equipment, allowing for on-site construction, rapid curing, and high production efficiency. Specialized equipment can apply a coating thickness of up to 1 mm over an area of more than 2,000 square meters per shift (8 hours). The coating surface is smooth and continuous with no seams. By adjusting the process parameters, an orange-peel-like surface can also be obtained. 7. Various pigments and fillers can be added according to usage requirements to create coatings with different colors and functions. 8. Suitable for anti-corrosion and waterproofing projects with special requirements such as tight project schedules, high environmental protection standards, and high fire safety requirements (in sensitive areas in the city center).