Regarding waterproof coatings

Waterproof coatings are coatings of solvent-based, water-emulsion-based, or powder-type varieties, made by using synthetic polymer materials, combinations of polymers with asphalt, or combinations of polymers with cement as the main film-forming substances, along with various additives, modifying materials, and filling materials. This coating is applied to surfaces of buildings such as rooftops, basements, toilets, bathrooms, and exterior walls that require waterproofing, and it enables the formation of a continuous, unified waterproof layer of a certain thickness under normal temperature conditions. 　　Waterproof coatings are viscous liquid polymer synthetic materials that have no fixed shape at room temperature; after application, they form a tough waterproof membrane on the substrate surface through the evaporation of solvents, the evaporation of water, or chemical curing. The basic properties of waterproof coatings are as follows: 1. At room temperature, waterproof coatings are in the form of viscous liquids; after application and curing, they form a seamless waterproof membrane. 2. Waterproof coatings are particularly suitable for use in areas such as vertical surfaces, corners, pipes passing through structural layers, protruding elements, and narrow spaces – where detailed waterproofing is required – and upon curing, they can create a complete waterproof membrane on the surfaces of these complex structures. 　　3. The application of waterproof coatings is a cold-process operation that is simple to carry out and requires low labor intensity. 　　4. The waterproof coating layer formed after curing has a low self-weight; waterproof coatings are commonly used for the construction of irregular roof structures such as lightweight thin-shell roofs. 　　5. Coated membrane waterproofing features good water resistance, weather resistance, acid and alkali resistance, as well as excellent elongation properties, enabling it to accommodate local deformation of the substrate. 　　6. The tensile strength of the membrane waterproof layer can be enhanced by adding reinforcement materials to it; areas prone to leakage, such as cracks in the base layer, structural joints, and pipe penetrations, can be easily reinforced, strengthened, or repaired. 　　7. Waterproof coatings are generally applied manually, and it is difficult to achieve uniform thickness; therefore, during application, the procedure must be followed strictly, with multiple applications made to ensure the minimum required amount per unit area and thus guarantee the quality of the waterproof coating layer. 　　8. The J11 coating provides waterproofing, and maintenance is relatively easy. 　　　Currently, waterproof coatings are generally classified according to the type of coating and the main component of the film-forming substance. 1. Classification by the liquid state of the coating: Based on the liquid state of the coating, waterproof coatings can be divided into three types: solvent-based, water-emulsion-based, and reactive types. 　　1. Solvent-based waterproof coatings: In these coatings, the polymer material that serves as the main film-forming substance is dissolved in an organic solvent to form a solution. Polymer materials exist in solution (paint) in a molecular state ； 　　This type of coating has the following characteristics: it forms a film through the evaporation of solvents, as well as through processes such as molecular bonding and overlapping of polymer molecules ； The coating dries quickly, resulting in a thin yet dense film ； The production process is relatively simple, and the coating has good storage stability ； Flammable, explosive, and toxic; safety precautions are necessary during production, storage, and use ； Due to the rapid evaporation of the solvent, it causes environmental pollution during application. 　　2. Emulsion-type waterproof coatings: In these types of waterproof coatings, the polymer materials that serve as the main components for forming the film are stably suspended in water in the form of extremely small particles (rather than in a molecular state), resulting in an emulsion-like coating. 　　Such coatings have the following properties: they form a film through the evaporation of water, as well as through processes such as the approach, contact, and deformation of solid particles ； The coating dries more slowly, and the density of the film formed in a single application is lower than that of solvent-based coatings; therefore, it is generally not suitable for use at temperatures below 5°C ； The storage period generally does not exceed six months ； Can be applied on slightly moist substrates ； Non-toxic and non-flammable; relatively safe during production, storage, transportation, and use ； Easy to use and does not pollute the environment ； The production cost is low. 　　3. Reactive waterproof coatings: In these types of coatings, the polymer materials that serve as the main components for forming the film exist in a prepolymer liquid form. They are usually composed of two-component or single-component systems, with little to no solvents contained within them. 　　Such coatings have the following characteristics: they transform from a liquid polymer prepolymer into a solid form (polymerization) through a chemical reaction with corresponding substances ； A thicker coating layer can be formed in a single application, with no shrinkage and a dense coating ； For two-component coatings, the ingredients must be mixed in a 1:2 ratio on-site and thoroughly stirred to ensure quality ； The price is high. This post was last edited by QXZ-1966 on 2009-4-15 08:05]