Characteristics and classification of polyurethane waterproof coating

1.Characteristics

● Excellent waterproof performance: The molecular structure of polyurethane is dense, which can form a tough waterproof film, effectively blocking the penetration of water molecules and having high anti-permeability performance.

● Strong durability: Polyurethane waterproof coating has good weather resistance and corrosion resistance, is not easy to age, and can maintain its waterproof performance for a long time.

● Simple construction: Polyurethane waterproof coating can be easily applied by brushing, spraying and other construction methods, and the coating dries quickly, and can quickly form a tough waterproof layer.

● Strong adaptability: Polyurethane waterproof coating can form a tight adhesion on various complex base surfaces, adapting to different construction environments and base conditions.

● Environmental protection and safety: Polyurethane waterproof coating is non-toxic and odorless, environmentally friendly, and meets environmental protection requirements.

2. Classification

(1) Depending on the components, polyurethane waterproof coating can be divided into two categories: single-component and two-component.

● Single-component polyurethane waterproof coatings

Single-component polyurethane waterproof coatings refer to coatings in which all components are mixed at one time, and no other materials need to be added when used. The advantage of this type of coating is that it is easy to apply, but attention should be paid to the mixing ratio and mixing uniformity before use to avoid affecting the quality of the coating. Single-component polyurethane waterproof coatings are generally applied by spraying or scraping, and have a fast drying time.

● Two-component polyurethane waterproof coatings

Two-component polyurethane waterproof coatings refer to coatings composed of two components, A and B, which need to be mixed in a certain proportion when used. The advantage of this type of coating is that the coating quality is high, but attention should be paid to the mixing ratio and mixing uniformity, as well as the use time. Two-component polyurethane waterproof coatings are generally applied by scraping or brushing, and have a long drying time.

(2) Depending on the solvent, polyurethane waterproof coatings can be divided into two categories: solvent-based and water-based.

● Solvent-based polyurethane waterproof coating

Solvent-based polyurethane waterproof coatings refer to coatings with organic solvents as diluents. The advantages of this type of coating are fast drying speed and good film-forming effect, but attention should be paid to the toxicity of organic solvents. Solvent-based polyurethane waterproof coatings are generally suitable for occasions with high waterproofing requirements, such as basements and toilets in buildings.

● Water-based polyurethane waterproof coating

Water-based polyurethane waterproof coatings refer to coatings with water as diluent. The advantages of this type of coating are non-toxic and odorless, and environmentally friendly, but attention should be paid to the slow drying speed of water-based coatings and relatively poor film-forming effect. Water-based polyurethane waterproof coatings are suitable for occasions with high environmental requirements, such as bridges and tunnels.