Characteristics and Construction Technology of Polyurea Waterproof and Anticorrosive Materials

1、 Material characteristics

The polyurea waterproof and anti-corrosion material does not contain any catalyst and can quickly cure on any curved surface. Spray on the inclined plane and vertical plane to form without sagging, and the walking intensity can be reached in one minute after 5 seconds of gel. Not sensitive to moisture and temperature, and not affected by environmental temperature during construction.

Polyurea waterproof and anti-corrosion material has two components, with a solid content of 100% and no volatile organic compounds.

Spraying or pouring can be carried out in a 1:1 volume ratio, with a thickness range of several hundred micrometers to a few centimeters in one application, overcoming the drawbacks of previous multiple applications. Excellent physical and chemical properties, such as tensile strength, elongation, flexibility, wear resistance, aging resistance, corrosion resistance, etc.

Good thermal stability, can reach 120 ℃ for long time use, and can withstand 350 ℃ short-term thermal shock. Polyurea waterproof and anti-corrosion materials can be made into products of different colors by adding various colors and dyes, just like ordinary coatings. The formula system is adjustable, with a feel ranging from soft rubber to hard elastomer. The prototype has good reproducibility and coating continuity. High density, no seams, no pinholes, beautiful and practical.

2、 Using tools

Using complete sets of equipment, construction is convenient and efficient; One construction can meet the design thickness requirements and overcome the drawbacks of previous multi-layer construction. The device has multiple switching modes, which can be sprayed with polyurea waterproof and anti-corrosion materials or poured.

The professional equipment required for spraying polyurea waterproof and anti-corrosion materials must have: a stable material conveying system; The oil well pump is a commonly used material conveying system, whose function is to provide sufficient raw materials for the host machine. The oil well pump must meet the working characteristics, such as bidirectional feeding and output capacity that can meet the needs of the host machine.

Temperature control and pressurization. They must meet the following characteristics: the ability to accurately measure and control the temperature of materials, and the ability to generate high pressure for even mixing and good atomization, making them easy to maintain and maintain.

The material mixing and atomization system is uniform; The spray gun is one of the key equipment in impact mixed spraying technology. Impact mixed spraying technology is often applied to spray polyurea elastomer technology.

Convenient material cleaning system: When the polyurea waterproof and anti-corrosion material is sprayed, it is generally not necessary to clean the oil pump and host, only the mixed atomization system needs to be cleaned. Generally, a dedicated gun is used to clean the tank. The gun washing tank is generally equipped with a pressure adjustment and quick connector adapter, which can allow the cleaning agent to clean the raw material holes of the gun or mixing head under pressure and remove residual raw materials before storage.

3、 Treatment and construction technology of concrete substrate

Use tools such as an angle grinder, high-pressure water gun, or vacuum cleaner to remove dust and scum from the surface.

After the moisture has completely evaporated, use caulking material to level the holes on the surface of the substrate and repair the defects. After solidification, use an electric grinding wheel to smooth the rigid putty.

Use high elastic sealant to repair cracks on the cement surface. The curing time of high elastic sealant is about 4 hours, and after the surface is dry, it can be trimmed with a sharp blade.

Clean and repair the concrete surface, spray or brush 1-2 matching primers.

In dry and flat concrete. On loose and rough concrete, the coating amount of WEP-100 sealing primer is 3-5m2/kg.

The spraying of the elastic layer should be carried out within 12-48 hours after the application of the sealing primer. If the interval exceeds 48 hours, a layer of sealing primer should be rebuilt one day before spraying the elastic layer of polyurea waterproof and anti-corrosion material, and then the elastic layer should be applied.

The coating thickness of anti-corrosion lining for storage tanks is generally 1.5mm to 2mm.

4、 Safety measures

The safety system at the construction site. When using spray polyurea waterproof and anti-corrosion material equipment for spraying operations, one should be familiar with maintenance rules. Safety operating procedures and measures.

Appropriate ventilation equipment should be provided during indoor or enclosed container construction, and protective equipment should be worn during construction.

Electrical equipment in the workplace should be equipped with explosion-proof devices, and fire sources should be isolated and equipped with corresponding fire-fighting equipment.