Silicone is not a certain product, it is a general term for organic silicon compounds. They reduce the tension on the surface of the building through a special molecular structure. When water vapor or raindrops in the air come into contact with the surface of the material, the hydrophobic surface of the material plays a hydrophobic role, making it difficult for liquid water to stay on the slope or facade. It rolls off in the form of water beads to prevent external water from penetrating into the cement-based material.

Waterproofing agent is a commonly used waterproofing material in home decoration. As one of the new products, silicone waterproofing agent has quickly won people's recognition due to its unique product features and advantages. So what is silicone waterproofing agent?
 Our country is currently in the stage of large-scale construction, and concrete and reinforced concrete are the most important materials in construction. Concrete often suffers from insufficient durability, which affects the service life of buildings. A big factor that affects the durability of concrete is the intrusion of moisture. The intrusion of moisture is a necessary condition for concrete carbonization, sulfate corrosion, and chlorine salt corrosion of steel bars. Water serves as a transport carrier, bringing CO₂, SO₂, SO₄²⁻, and Cl- dissolved in water into the concrete, causing corrosion damage to the concrete. At the same time, the intrusion of water causes the cement Ca(OH)₂and CSH-gel to dissolve, seriously affecting the durability of concrete. Therefore, waterproofing concrete to improve its impermeability is an effective method to improve durability.
What is silicone waterproofing agent?
Silicone waterproofing agent is an ideal waterproofing agent. It not only has good waterproofing properties, but also has good acid resistance, alkali resistance, and high temperature resistance. It also has good antifouling properties and can prevent concrete from soiling.
 Silicone waterproofing agent is a new type of waterproof material for universities that is pollution-free and non-irritating and is widely used in advanced countries in the world. After the silicone waterproofing agent is sprayed (or painted) on the surface of the building, it can form a colorless, transparent, UV-resistant breathable film on the surface that is invisible to the naked eye. When rain hits it or encounters humid air, water droplets It will flow naturally and prevent moisture from intruding into the residence. At the same time, it can also wash away the dust on the surface of the building, thereby making the interior walls moisture-proof and mildew-proof, and the exterior walls clean and preventing weathering.
Silicone waterproofing agent waterproofing life
Silicone waterproofing agent is a new type of water-soluble waterproofing agent made from a variety of fatty acids and more than ten inorganic materials through high-temperature chemical reactions using the most advanced production technology. Its waterproofing life depends on where it is used. ?
The "Four Fearless" silicone waterproofing agent and high-elastic skin-type rubber waterproof coating tube can be used for 10 years. It is not afraid of water leakage, aging, cracking and deformation, and puncture. Very good waterproof
The mechanism of action of silicone waterproofing agent
Silicon waterproofing agent is a water-repellent waterproofing agent. When the silicone waterproofing agent is applied to the surface of a silicon-based substrate, it penetrates into the substrate under the capillary action of the capillary tube. The dehydration reaction occurs between the organic silicon molecules and the silanol groups in the substrate, forming a directional organic siloxane water film on the surface of the substrate and capillary pores. This water-increasing film is several nanometers thick, does not affect the appearance of the concrete, and can prevent the capillary action of the base material capillaries on water, thus preventing the intrusion of moisture. At the same time, it does not block the capillary tubes and allows the concrete to maintain good ventilation.
Characteristics of silicone waterproofing agent
  1. Excellent waterproof performance. Anti-seepage, anti-leakage, waterproofing, color retention, anti-pollution, anti-weathering, anti-salting out and anti-freeze-thaw peeling of building exterior walls, ceramic tiles, marble, etc.
  2. Good breathability. It does not block the pores and micropores on the surface of the building, and does not affect the dissipation of moisture in the wall and indoors. The wall treated with it will always be dry as if it were wearing a hydrophobic coat.
  3. It has strong durability, is anti-pollution, anti-weathering and retains color. It can penetrate into the wall to a certain depth, so it is less affected by ultraviolet radiation and atmospheric aging.
Uses of silicone waterproofing agents
Silicone waterproofing agent can be used for coating decorative mortar, natural or artificial marble, natural or artificial granite, decorative concrete, fair-faced concrete, blocks, bricks and other surfaces.
It mainly plays the following roles:
1. Anti-fouling and dust removal effect
There are a large number of micro-cracks, depressions and pores on the masonry surfaces, concrete and mortar decorative surfaces of building exterior walls, causing water absorption and dust hanging.
When atmospheric precipitation mixes with the dust on the above surface to form black sewage, it continuously penetrates into the gaps and forms black stripes or flake stains after drying. Seriously damage the decorative effect of the decorative surface.
But when the silicone waterproofing agent is coated, the hydrophobic film formed will cause the sewage to roll down in the shape of beads, which not only prevents the sewage from seeping inward, but also causes the attached dust to fall down when the sewage water beads roll down.
Therefore, the silicone wall washed by heavy rain (or artificial water spray) is completely different from the untreated wall, showing a brand new look, and the serious pollution situation after the rain is significantly improved.
2. Prevent weathering and whitening
Weathering is caused by the migration of inorganic salt water solution to the wall surface to form crystals and volume expansion, which causes stress damage to wall cracks. This destructive effect occurs repeatedly day after day, causing the wall surface to become loose and peeling until it loses its function.
The waterproofing agent forms a hydrophobic layer on the wall surface, which prevents external precipitation from penetrating inward and internal salt solution from migrating outward, thus preventing weathering caused by salt precipitation.
Whitening refers to the migration of free calcium hydroxide aqueous solution from inside the building wall, and after drying, it is deposited on the surface of the wall. It gradually reacts with carbon dioxide to form carbonate that is insoluble in water and permanently adheres to the wall. There are uneven patches of white marks on the surface.
The uneven migration of calcium hydroxide aqueous solution will cause whitening and whitening on the wall, which not only affects the decorative effect, but also has a great destructive effect. The hydrophobic layer formed by the silicone coating on the wall surface is an effective measure to avoid whitening.
In addition, silicone release film can also prevent microbial growth, frost damage, acid rain corrosion, color preservation and anti-aging effects.

Silicone waterproofing agent spray (coating) construction method
The construction of silicone waterproofing agent is generally divided into three procedures: base surface cleaning, crack repair, and spraying. (This process is also the main process for us to repair and repair leaks on exterior walls)
1. Clean the surface of the base layer
Before spraying silicone waterproofing agent, dust, moss and other contaminants on the surface of the base layer must be cleaned. Generally, dust and floating soil can be washed with clean water or scrubbed with a rag; oil stains, rust stains, and moss stains need to be carefully cleaned with cleaning agent, and then rinsed with clean water to remove residual cleaning agent.
2. Repair cracks
Base layer leakage is divided into two categories: capillary water absorption leakage and crack and hole water seepage. Silicone waterproofing agent is very effective in treating capillary water absorption and leakage. However, if there are large cracks or holes in the base layer, spraying silicone waterproofing agent alone often cannot solve the problem, because if there is strong wind when it rains, the rainwater will still penetrate deeply through the cracks and holes driven by the greater wind pressure. within the grassroots level. For this reason, appropriate materials must be used to fill and repair cracks and holes before spraying silicone waterproofing agent.
3. Spray silicone waterproofing agent
According to the material manufacturer’s usage ratio and construction method, just strictly follow the process. Pay attention to labor protection measures and safety.

How to use silicone waterproofing agent
  1. Cleaning: Clean the cement surface pollutants to ensure that there is no floating soil, mortar and garbage.
 2. Drying: Let the cement dry naturally.
3. Spraying: After the cement surface is completely dry, use a spray gun, brush, or roller to spray evenly on the cement surface until the treated surface is completely saturated.
 4. Drying: Let the cement dry naturally without contact with rainwater within 24 hours. Construction and installation can be carried out after 24 hours.
 5. Maintenance: Do not touch water or be polluted within 24 hours. Suitable for construction temperature 0～40oC
 6. After painting, allow the treated surface to dry naturally, and then paint a second time before the surface is dry. It can be applied by soaking, spraying or brushing with rags, sponges, brushes, rollers and sprayers. After application, wipe off excess liquid with a soft cloth for 5 to 10 minutes, and leave it free of water for at least 24 hours.
Disadvantages of silicone waterproofing agents
Many users reported that leaks still occurred in their houses after using silicone waterproofing agents, especially outside the exterior walls. In terms of waterproofing, if leakage still occurs after applying waterproofing agent, is it still necessary to apply waterproofing agent?
It is true that the silicone waterproofing agents on the market must have drawbacks, because the emergence and development of any new thing is accompanied by many uncertainties. However, the phenomenon of water seepage or even repeated water seepage can only mean that it is not The problem with silicone waterproofing agents is that the products purchased are not true waterproofing agents.
There are countless fake waterproofing agents on the market, and most of them are even just poured out with tap water. The waterproofing effect comes from the fake claims made by the sellers. These waterproofing agents are destined to have problems with their use, and the reputation of silicone waterproofing agents has also changed. If it is not good, consumers are reminded to be cautious when purchasing waterproofing agents. As long as there are requirements for waterproofing, you will definitely want to buy the most suitable one.
Of course, the real silicone waterproofing agent is not fully waterproof. It only has good waterproofing performance for exterior walls. Most people even think that it serves more as an anti-penetration material. , rather than truly having waterproof properties, taking M1500 as an example, its more function is to enhance the density of cement concrete.
The waterproofing agent cannot form a dense and impermeable protective film, does not have any flexibility, and the density cannot be guaranteed. These three major shortcomings make the waterproofing agent market more willing to choose silicone waterproofing while having the properties of environmental protection, water resistance, and weather resistance. The agent can adapt to the deformation of the base layer and can also improve the food impermeability of cement concrete.