There are two major categories of waterproof materials […]
There are two major categories of waterproof materials on the market: First, polyurethane waterproof coatings. This kind of material is generally made of polyurethane and coal tar as raw materials. The tar gas it evaporates is highly toxic and is not easily removed. Therefore, it was banned from use in China in 2000. Polyurethane waterproof coatings are still being marketed, using asphalt as a raw material instead of coal tar. However, when using such a coating, it is generally diluted with an organic solvent containing toluene, xylene and the like, and thus contains toxicity; and the other type is a polymer cement-based waterproof coating. It is composed of a variety of water-based polymer emulsions and high-quality cements mixed with various additives. The flexibility of the polymer (resin) is integrated with the rigidity of the cement, making it excellent in impermeability and stability. Its advantages are convenient construction, low overall cost, short construction period, and non-toxic environmental protection. Therefore, polymer cement base has become the protagonist of the waterproof coating market.
Waterproof coating refers to a kind of coating that the coating formed by coating can prevent rain or groundwater from leaking.
Waterproof coatings can be classified according to the coating state and form: emulsion type, solvent type, reactive type and modified asphalt.
The first type of solvent-based coating: This type of coating has a wide range of types and quality, but it is costly, poor in safety, and not very common.
The second type is water-emulsion and reactive polymer coatings: it is difficult for these coatings to be uniformly dispersed in colloids by various reinforcing agents, fillers, and elastomers, and can only be added by grinding. A small amount of compounding agent, reactive polyurethane is a two-component, perishable, high cost.
The third type of plastic modified asphalt: This type of product is resistant to ultraviolet light, good high temperature resistance, but the elongation at break is slightly worse.