Volume percentage: 40-55% of mixed solution of trialkoxysilane and tetraalkoxysilane, 30-50% of fluorosilane solution of 1%, 30% of nano-silica solution of 1.5-3.0%, and 3.0-8.5% of nano-titanium dioxide solution of1%. Primer is 1% fluorosilane solution;

Methods/steps

A, stone should be cleaned before coating protective agent.

Stone coated with drugs and stone protectants must be clean. Because the stains on the stone surface will be brought into the stone and solidified in the micropores of the stone in the process of coating the protective agent, forming spots that are difficult to remove. Therefore, the rust, oil stain, pigment and dust on the stone surface should be removed before coating the protective agent, and it is best to rinse it immediately after cutting and dry it for later use.

Second, the stone should be dried and then coated with protective agent.

Only by thoroughly drying the stone can the stone fully absorb the protective agent and achieve the ideal protective effect. In the season of low temperature and high relative humidity, it is recommended to use drying room to dry slate, and it is prudent to use gas spray gun to dry slate. The following items should be paid attention to when drying slate.

1, drying room

In northern winter, the construction of drying room can increase the indoor temperature, effectively accelerate the drying speed of stone and ensure the construction quality of protective agent. Therefore, it is suitable for large-scale projects. Ventilation, fire prevention and gas poisoning prevention should be strengthened in the single drying room.

2. Gas spray gun

Gas spray gun can be used for local drying of stone, but the moving speed of gas spray gun on slate should be controlled well. If the speed is too fast, the surface temperature of the stone is not high enough to effectively remove the moisture in the cracks of the stone; If the moving speed of the gas spray gun is too slow and concentrated at a certain point, too much heat will be conducted to the stone surface, resulting in excessive local temperature, which will cause local expansion and fracture of the stone surface in serious cases. This method is convenient and quick, and is suitable for local and corner drying, for example, when the protected stone is cut again, it will get wet. General gas spray gun should not be used when drying stone in a large area. The use of gas spray guns should also strengthen the ventilation, fire prevention and gas poisoning prevention of the construction site.

Three, the use of protective agent must be sufficient and uniform.

The use of protective agents must be sufficient. If the dose of protective agent absorbed by stones is not enough, it will not have the due protective effect. The amount of protective agent used for different density stones will be different, and the coating method for the required number of times will be different. Such as white sand beige, singeing granite and white granite. This kind of stone has a big gap and needs a lot of protective agent. The brushing times should be more than two times. If water-based protective agent is used, the soaking method should be adopted as far as possible if conditions permit. Applying a small amount of protective agent at a time is generally not enough to block capillary phenomenon and prevent pollution. However, for some stones with high density and no high-temperature processing cracks, the dosage of protective agent can be relatively small. Different stone installation locations and installation methods have different requirements on the dosage of protective agent. Compared with dry-hung wall stone, the dosage of protective agent used in cement wet paving ground stone is larger, and it must be painted at least twice, and it must be painted evenly without leaving gaps.

The purpose of applying protective agent is to obtain protective effect. How many square meters of protective agent to apply and how many square meters to protect are different concepts, and what is ultimately needed is the number of square meters to achieve the protective effect. For the 35mm-thick sintered stone, the absorption of protective agent in water dosage form can reach about 0.5kg per square meter, while the dosage of brushing method may be much less, which may not necessarily prevent the moisture-absorbing substances from wet paving of cement.

Fourth, remove excess protective agent

Wipe the protective agent left on the stone surface during construction with a clean rag. If the stone protectant is not completely absorbed by the stone and the residual protectant is not removed, it will leave traces of protectant on the stone surface after curing, and even cause mottling, which is very difficult to remove. The residual methyl silicate water-based protective agent on the stone surface will also reduce the gloss of the stone surface. Many projects follow the trend because they don't notice this.

Five, the static stop time

After the protective agent is constructed, it should be allowed to stand for a period of time, which is an important step to ensure the penetration and curing of the protective agent and form a protective effect. The time of lying down and resting is related to the humidity and temperature of the environment at that time. The rest time should at least wait until the coated protective agent stops flowing when the stone is erected, preferably a non-stick and non-wet napkin.

Six, healthy time

The stone coated with protective agent should be fully overhead for health preservation, which is an important link in stone protection construction. The so-called maintenance is to let the stone coated with protective agent dry naturally under ventilation conditions, and basically complete the process of chemical change. Generally speaking, it takes 48 hours or even longer for water-based protective agents to basically complete the chemical change process; It takes a short time for solvent-based protectants to complete the crosslinking and curing process, but it also takes more than 24 hours. The lower the temperature, the longer the curing time. Do not touch water and other pollutants during curing.

If the curing time is not enough, it will be paved in a hurry. Although there is hydrophobic phenomenon from the surface of the stone, whose surface phenomenon is this? As long as it doesn't rain when hanging stones, the impact is not great. However, when installing the wall and ground stone by wet method, because the stone protective agent has not been completely cross-linked and solidified, the alkaline cement slurry will destroy the reaction process of the protective agent, making the protective layer unable to stop the migration of capillary water. Alkaline silica gel, soluble salts and various soluble pollutants in cement slurry may penetrate into the stone surface, resulting in a series of lesions such as water spots, alkali return, yellowing and rust return, leading to protection failure. It is very difficult to treat uneven water stains and lesions caused by protection failure, and the cost of removal is also quite high.