Spray construction process of polyurea waterproof and anti-corrosion coating

The professional equipment required for spraying polyurea waterproof and anti-corrosion coatings must have:

1. Stable material conveying system.

Pumps are commonly used material conveying systems, whose function is to provide sufficient raw materials for the host machine. The pump must meet the working characteristics of bidirectional feeding and output that can meet the needs of the host.

2. Accurate material measurement system.

The metering system for spraying polyurea waterproof and anti-corrosion coatings is usually referred to as the host, mainly composed of hydraulic or pneumatic driven A and R proportional pumps, temperature control systems, etc. A. After the material is pumped out by the R pump, it enters the host for measurement, temperature control, and pressure control. They must meet the following characteristics: the ability to accurately measure and control the temperature of the material, and generate high pressure for its uniform mixing and good atomization, making it easy to maintain.

3. The material mixing and atomization system is uniform.

The spraying of polyurea waterproof and anti-corrosion coatings is one of the key equipment in the impact mixing spraying technology. Impact mixed spraying technology is widely used in polyurea elastomer spraying technology, including single valve stem, airless atomization, and mechanical self-cleaning spraying.

4. The material cleaning system is convenient.

When the spraying of polyurea waterproof and anti-corrosion coating is completed, the pump and host generally do not need to be cleaned, only the mixing and atomization system needs to be cleaned. Generally, a special gun is used to clean the tank. The gun washing tank is generally equipped with a pressure regulator and a quick connector adapter, which allows the cleaning agent to clean the raw material holes of the gun or mixing head under pressure and remove residual raw materials before the gun is stored.

Auxiliary equipment includes:

1. Air compressor;

2. Oil water separator;

3. Insulation construction vehicle;

4. R material mixer;

5. Other: such as silicone desiccant; A. R material bucket, generator, etc.

3、 Treatment and construction technology of concrete substrate

1. When spraying polyurea waterproof and anti-corrosion coating, use tools such as angle grinder, high-pressure water gun, or vacuum cleaner to clean the dust and scum on the surface.

2. After the moisture has completely evaporated, the surface holes of the substrate are filled with sealing materials, defects are repaired, and leveled. After the rigid putty is cured, it is ground flat with an electric grinding wheel.

3. Repair cracks on the cement surface with high elastic sealant. The curing time of high elastic sealant is about 4 hours, and the surface can be repaired with a sharp blade after drying.

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

5. The coating amount of the sealing primer on dry and flat concrete is 8-10m2/kg. In loose and rough concrete.

6. Spray the elastic layer within 12-48 hours after the application of the sealing primer. If the interval exceeds 48 hours, the sealing primer should be rebuilt one day before spraying the elastic layer, and then the elastic layer should be applied.

7. The coating thickness of anti-corrosion lining for storage tanks is generally 1-5mm-2mm.

Safety measures for spraying polyurea waterproof and anti-corrosion coatings

1. Construction site safety system.

When using spraying 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.

After the construction is completed, the paint packaging barrel should be closed, and flammable materials such as tools, coatings, and materials should be cleaned to eliminate the source of ignition.

2. Safety and protection during spraying polyurea elastomer construction.

Due to the high temperature of the material during spraying construction (usually around 60 ℃) and the possibility of splashing, construction personnel must take personal safety measures.

(1) Eye protection: Chemical safety goggles should be worn when there is a possibility of contact with mist during the spraying process.

(2) Respiratory system protection: During the spraying process, a large amount of mist will be generated, which has a certain irritant effect on the respiratory tract. Therefore, construction personnel should wear certified respiratory protective equipment.

(3) Wear rubber gloves, protective caps, or one-piece protective clothing.