Building waterproof coating on the surface of the structure can form a continuous elastic, waterproof, impermeable, moisture-proof function of the coating, widely used in some buildings may be water erosion of the structural parts or structural components, such as roof, basement, toilet bath, water tower, pool, water storage tank waterproof, moisture-proof and seepage. In general, at present, Europe and the United States and other countries building waterproof coatings in the field of building waterproof materials market share is relatively high, domestic building waterproof coatings in waterproof materials account for about 28.09%, waterproof coil market share account for up to 63.76%.
The development of domestic building waterproof coating started relatively late in Europe and the United States and other countries, but the development is very rapid, the number of enterprises increased rapidly, in 2017 the number of domestic building waterproof production enterprises has been nearly more than one thousand, the output of 2,964,000 tons. In 2021, the market demand for building waterproof coatings exceeded 5.5 million tons, and the market size reached 64 billion yuan.
Asphalt waterproof coating products mainly include: solvent-free asphalt coating (non-curing rubber asphalt waterproof coating, hot melt type rubber asphalt waterproof coating) and emulsion type asphalt coating (spraying quick-setting rubber asphalt waterproof coating, waterborne asphalt waterproof coating on bridge deck, etc.).
Non-curing rubber asphalt waterproof coating is made of rubber powder, asphalt and special additives as the main raw materials, which are mixed and modified to form a new type of waterproof material with creep property that keeps sticky paste for a long time in the application state. The coating can not cure for a long time, always maintain the characteristics of sticky glue, self-healing ability is strong, touch is sticky, difficult to peel, at -20 °C still has good bonding performance, can solve the compatibility problem of the existing waterproof roll and waterproof coating composite use. Hot melt rubber asphalt waterproof coating is solid at room temperature, with asphalt, plasticizer, polymer modifier, filler as the main raw materials, a new waterproof coating blended at a certain temperature, the construction of heating dissolved into liquid, using scraping or spraying construction, and non-curing coating has similar characteristics and role.
Polymer waterproof coating mainly includes: reactive type (polyurethane waterproof coating and spraying polyurea waterproof coating), volatile type (polymer emulsion waterproof coating and emulsion silicone rubber waterproof coating) and composite (polymer cement waterproof coating).
Polyurethane waterproof coating is divided into single component type and two component type two categories: according to the national standard is divided into type ⅰ products (common waterproof engineering of all kinds of buildings), type ⅱ products (passenger dedicated line high-speed railway polyurethane waterproof coating layer, etc.) and type ⅲ products (grandstand, parking lot, roof and other high strength applications). One component polyurethane waterproof coating can be divided into three types: wet curing type, water curing type and latent curing type. Single-component and two-component coatings ARE coated on the surface of the base by scraping, brushing and spraying, and cured by reaction to form an elastic, tough and durable waterproof coating. Spray polyurea waterproof coating (SPUA) is a new type of solute free and pollution-free green waterproof and protective coating, which is generated by the reaction of isocyanate component and amino compound component. SPUA is widely used in various waterproof, anti-corrosion and wear-resistant engineering.
Inorganic waterproof coatings in the largest amount is cement - based penetration of crystalline waterproof coatings. Cement-based permeable crystalline waterproof coating is based on cement, quartz powder as the main base material, mixed with a variety of active chemical substances prepared from the powder material. The product IS non-toxic, harmless, tasteless, polluTION-free, can be safely used for drinking water and other projects, with waterproof, anticorROsion, protection of steel bar function. During construction, it can be mixed with water to brush or spray on the surface of concrete, or it can be coated with dry powder and pressed into the surface of unsolidified concrete. Super penetration ability, automatic repair micro crack function; Inorganic material, aging resistance; The construction is simple, save labor and time, and the comprehensive cost is low.
Domestic architectural waterproof coating industry is in rapid growth, with international quality standards rise, the requirements for the quality of the product will continue to improve, the improvement of environmental requirements and the market demand of high performance and environmentally friendly products, which will promote the development of building waterproof coating industry in China entered a new stage, the growth in the next five years is expected to remain at 13% level, By 2025, the building waterproof coating market is expected to reach 100 billion yuan market size.