Polyurea waterproof materials are generally used in some very large construction projects, because polyurea waterproof materials can help these large construction projects achieve waterproofing and prevent water leakage. Although polyurea waterproof materials are very commonly used, in fact, if we want to use waterproof materials well, including its construction methods, we need to pay great attention to it, so that it can truly achieve the waterproof function. So next, the editor will introduce to you the construction technology of polyurea waterproof coating.
Construction technology
1. Determination of construction conditions
1. Construction should be based on the installation of various equipment, columns, pipelines, penetration parts and painting construction carried out before.
2. Ensure that the environment and site conditions are suitable for construction and material curing. The temperature of the substrate surface should be 5°C higher than the dew point temperature.
2. Materials required for construction
Selected spray SPUA materials; Sealant; Primer; Topcoat (optional); Caulking material; Interlayer adhesive Mixture; anti-slip particles (quartz sand, rubber particles, etc.);? Backing material (polyethylene foam rods, etc.);? Rolling material required for reinforcement layer (such as glass fiber cloth, chemical fiber non-woven fabric, polyester non-woven fabric etc.), coatings;? Antifouling tape.
3. Construction tools
Except for the H-3500, H-20/35 main unit and GX-7 spray gun produced by GUSMER Company, the rest are commonly used tools.
4. Construction
4.1 Substrate treatment
4.1.1 Concrete substrate
(1). The new cement substrate should Completely hydrate and dry for 28 days before construction can begin until the moisture has fully evaporated. Otherwise, the moisture accumulated inside will evaporate after being heated, causing the coating to bubble.
(2). Use sandblasting to treat the surface of the concrete substrate to ensure that the surface of the concrete substrate is free of impurities such as oil, dust and broken cement blocks.
(3). The surface of the concrete substrate should be kept dry and intact.
(4). The closing part shall be processed according to the requirements of the drawing.
4.2 Construction of primer, plugging material and sealant
(1). Construction of matching primer. Do not allow the primer to stain or block the channel structure of the closing area. Metal substrates generally do not require primer. If SPUA material is sprayed for lining, the metal substrate needs to be primed.
(2). Use caulking material to fill the holes in the substrate, and the holes must be filled firmly. Otherwise, the heat released during the SPUA curing process will expand the air in the holes, causing the coating to bubble.
(3). Construction of sealant. Apply sealant according to the requirements of the construction drawings; when constructing roots, holes, seats, corners and other parts, the cross-section of the sealant should be a right-angled triangle with a right-angled side of 5mm; when constructing other parts, just adjust it according to the requirements of the drawings .
4.3 Construction of reinforcement layer
Construct the reinforcement layer according to the requirements of the drawings. The specific construction of the reinforcement layer is as follows; after the construction of the previous required processes, use the special coating for the reinforcement layer developed by our company to paste a reinforcement coil on the surface of the substrate where the reinforcement layer needs to be constructed, and the edges should be expanded outward by 50- 60mm, thickness is about 1mm.
4.4 Steel substrate
(1). Check: burrs, welding slag, rust, oil stains, cracks, old paint film.
(2). Surface treatment: A. Degreasing: solvent, alkali, emulsification, ultrasonic.
B. Rust removal: sandblasting (shot), manual, mechanical.
(3). Apply primer: If it is used as an outer wall, it is not necessary to apply primer if it has been sandblasted. If it is used as an inner wall, you need to apply primer to enhance adhesion.
(4). Spray polyurea.
(5). Check: thickness, leakage points, adhesion.
4.5 Construction of SPUA materials
Try to construct SPUA materials within 12 hours of the reinforcement layer construction. If it exceeds 12 hours, the reinforcement layer should be polished and an interlayer adhesive layer should be brushed or sprayed. mixture, apply SPUA coating after 20 minutes.
When applying SPUA coating, the next layer should cover 50% of the previous layer, commonly known as "pressing gun". Only in this way can the coating be ensured evenly.
For places with high anti-skid requirements, anti-skid particles (such as rubber particles, emery, etc.) can be artificially granulated or manually spread on the wet coating.
The collective operation of artificial granulation is as follows: using the principle of rapid curing of SPUA technology, and through the constructor's control of the spray angle and flow rate, before the last coating is completely cured, the construction process is carried out at a distance of At a certain distance from the site, open the spray gun and let the mixed and atomized spray paint fall freely on the construction site to form particles of a certain size and obtain a rough anti-slip particle surface, which can prevent slipping and matting (mainly used in film, television, entertainment industry and indoor lighting stadiums and other occasions). When making artificial granulation, attention should be paid to the wind direction and wind force. The constructor should be upwind. The wind force should be below level 3 to reduce the falling of atomized particles to construction personnel and equipment.
The manual spreading of anti-skid particles is carried out as follows: before the last coating is completely cured, the anti-skid particles are evenly sprinkled on the construction site by hand. After the coating is cured, the anti-skid particles are swept and spread Clean the unglued anti-slip particles.
4.6 Topcoat construction
Aromatic SPUA materials will turn yellow after being exposed to ultraviolet rays, which is unfavorable for occasions with light color requirements. Therefore, it is recommended to paint accordingly. Anti-yellowing topcoat. The topcoat should be applied within 12 hours of SPUA coating application. If it exceeds 12 hours, the SPUA coating should be sanded, painted or sprayed with an intercoat adhesive, and then topcoat applied.
4.7 Repair
SPUA material itself has very excellent mechanical properties and will generally not be damaged during normal use. Once accidental damage occurs (such as heavy objects falling, impact, etc.), SPUA-202S repair material developed by our company can be used for partial repair. The specific steps are as follows:
(1). Polish the surface to be repaired, and the polished edge extends 150mm outward than the surface to be repaired.
(2). Construction interlayer adhesive.
(3). Apply repair materials to the polished parts. Care should be taken to ensure a smooth transition from the patch coating to the surrounding coating.
(4). For special applications, apply a matching topcoat.
Summary: The editor introduced the construction technology of polyurea waterproofing materials above. If we want to do a good job in the construction process of polyurea waterproof coating materials, the first thing we need to do is to determine where we will use our polyurea waterproof materials. Once we have determined where we will use it, we can start construction. In fact, when applying polyurea waterproof coating materials, we need to lay a certain cement floor frame before we can apply these waterproof coatings on it.